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c9de560d AT |
1 | /* |
2 | * Copyright (c) 2003-2006, Cluster File Systems, Inc, info@clusterfs.com | |
3 | * Written by Alex Tomas <alex@clusterfs.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public Licens | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111- | |
17 | */ | |
18 | ||
19 | ||
20 | /* | |
21 | * mballoc.c contains the multiblocks allocation routines | |
22 | */ | |
23 | ||
18aadd47 | 24 | #include "ext4_jbd2.h" |
8f6e39a7 | 25 | #include "mballoc.h" |
28623c2f | 26 | #include <linux/log2.h> |
a0b30c12 | 27 | #include <linux/module.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
66114cad | 29 | #include <linux/backing-dev.h> |
9bffad1e TT |
30 | #include <trace/events/ext4.h> |
31 | ||
a0b30c12 TT |
32 | #ifdef CONFIG_EXT4_DEBUG |
33 | ushort ext4_mballoc_debug __read_mostly; | |
34 | ||
35 | module_param_named(mballoc_debug, ext4_mballoc_debug, ushort, 0644); | |
36 | MODULE_PARM_DESC(mballoc_debug, "Debugging level for ext4's mballoc"); | |
37 | #endif | |
38 | ||
c9de560d AT |
39 | /* |
40 | * MUSTDO: | |
41 | * - test ext4_ext_search_left() and ext4_ext_search_right() | |
42 | * - search for metadata in few groups | |
43 | * | |
44 | * TODO v4: | |
45 | * - normalization should take into account whether file is still open | |
46 | * - discard preallocations if no free space left (policy?) | |
47 | * - don't normalize tails | |
48 | * - quota | |
49 | * - reservation for superuser | |
50 | * | |
51 | * TODO v3: | |
52 | * - bitmap read-ahead (proposed by Oleg Drokin aka green) | |
53 | * - track min/max extents in each group for better group selection | |
54 | * - mb_mark_used() may allocate chunk right after splitting buddy | |
55 | * - tree of groups sorted by number of free blocks | |
56 | * - error handling | |
57 | */ | |
58 | ||
59 | /* | |
60 | * The allocation request involve request for multiple number of blocks | |
61 | * near to the goal(block) value specified. | |
62 | * | |
b713a5ec TT |
63 | * During initialization phase of the allocator we decide to use the |
64 | * group preallocation or inode preallocation depending on the size of | |
65 | * the file. The size of the file could be the resulting file size we | |
66 | * would have after allocation, or the current file size, which ever | |
67 | * is larger. If the size is less than sbi->s_mb_stream_request we | |
68 | * select to use the group preallocation. The default value of | |
69 | * s_mb_stream_request is 16 blocks. This can also be tuned via | |
70 | * /sys/fs/ext4/<partition>/mb_stream_req. The value is represented in | |
71 | * terms of number of blocks. | |
c9de560d AT |
72 | * |
73 | * The main motivation for having small file use group preallocation is to | |
b713a5ec | 74 | * ensure that we have small files closer together on the disk. |
c9de560d | 75 | * |
b713a5ec TT |
76 | * First stage the allocator looks at the inode prealloc list, |
77 | * ext4_inode_info->i_prealloc_list, which contains list of prealloc | |
78 | * spaces for this particular inode. The inode prealloc space is | |
79 | * represented as: | |
c9de560d AT |
80 | * |
81 | * pa_lstart -> the logical start block for this prealloc space | |
82 | * pa_pstart -> the physical start block for this prealloc space | |
53accfa9 TT |
83 | * pa_len -> length for this prealloc space (in clusters) |
84 | * pa_free -> free space available in this prealloc space (in clusters) | |
c9de560d AT |
85 | * |
86 | * The inode preallocation space is used looking at the _logical_ start | |
87 | * block. If only the logical file block falls within the range of prealloc | |
caaf7a29 TM |
88 | * space we will consume the particular prealloc space. This makes sure that |
89 | * we have contiguous physical blocks representing the file blocks | |
c9de560d AT |
90 | * |
91 | * The important thing to be noted in case of inode prealloc space is that | |
92 | * we don't modify the values associated to inode prealloc space except | |
93 | * pa_free. | |
94 | * | |
95 | * If we are not able to find blocks in the inode prealloc space and if we | |
96 | * have the group allocation flag set then we look at the locality group | |
caaf7a29 | 97 | * prealloc space. These are per CPU prealloc list represented as |
c9de560d AT |
98 | * |
99 | * ext4_sb_info.s_locality_groups[smp_processor_id()] | |
100 | * | |
101 | * The reason for having a per cpu locality group is to reduce the contention | |
102 | * between CPUs. It is possible to get scheduled at this point. | |
103 | * | |
104 | * The locality group prealloc space is used looking at whether we have | |
25985edc | 105 | * enough free space (pa_free) within the prealloc space. |
c9de560d AT |
106 | * |
107 | * If we can't allocate blocks via inode prealloc or/and locality group | |
108 | * prealloc then we look at the buddy cache. The buddy cache is represented | |
109 | * by ext4_sb_info.s_buddy_cache (struct inode) whose file offset gets | |
110 | * mapped to the buddy and bitmap information regarding different | |
111 | * groups. The buddy information is attached to buddy cache inode so that | |
112 | * we can access them through the page cache. The information regarding | |
113 | * each group is loaded via ext4_mb_load_buddy. The information involve | |
114 | * block bitmap and buddy information. The information are stored in the | |
115 | * inode as: | |
116 | * | |
117 | * { page } | |
c3a326a6 | 118 | * [ group 0 bitmap][ group 0 buddy] [group 1][ group 1]... |
c9de560d AT |
119 | * |
120 | * | |
121 | * one block each for bitmap and buddy information. So for each group we | |
122 | * take up 2 blocks. A page can contain blocks_per_page (PAGE_CACHE_SIZE / | |
123 | * blocksize) blocks. So it can have information regarding groups_per_page | |
124 | * which is blocks_per_page/2 | |
125 | * | |
126 | * The buddy cache inode is not stored on disk. The inode is thrown | |
127 | * away when the filesystem is unmounted. | |
128 | * | |
129 | * We look for count number of blocks in the buddy cache. If we were able | |
130 | * to locate that many free blocks we return with additional information | |
131 | * regarding rest of the contiguous physical block available | |
132 | * | |
133 | * Before allocating blocks via buddy cache we normalize the request | |
134 | * blocks. This ensure we ask for more blocks that we needed. The extra | |
135 | * blocks that we get after allocation is added to the respective prealloc | |
136 | * list. In case of inode preallocation we follow a list of heuristics | |
137 | * based on file size. This can be found in ext4_mb_normalize_request. If | |
138 | * we are doing a group prealloc we try to normalize the request to | |
27baebb8 TT |
139 | * sbi->s_mb_group_prealloc. The default value of s_mb_group_prealloc is |
140 | * dependent on the cluster size; for non-bigalloc file systems, it is | |
c9de560d | 141 | * 512 blocks. This can be tuned via |
d7a1fee1 | 142 | * /sys/fs/ext4/<partition>/mb_group_prealloc. The value is represented in |
c9de560d AT |
143 | * terms of number of blocks. If we have mounted the file system with -O |
144 | * stripe=<value> option the group prealloc request is normalized to the | |
d7a1fee1 DE |
145 | * the smallest multiple of the stripe value (sbi->s_stripe) which is |
146 | * greater than the default mb_group_prealloc. | |
c9de560d | 147 | * |
d7a1fee1 | 148 | * The regular allocator (using the buddy cache) supports a few tunables. |
c9de560d | 149 | * |
b713a5ec TT |
150 | * /sys/fs/ext4/<partition>/mb_min_to_scan |
151 | * /sys/fs/ext4/<partition>/mb_max_to_scan | |
152 | * /sys/fs/ext4/<partition>/mb_order2_req | |
c9de560d | 153 | * |
b713a5ec | 154 | * The regular allocator uses buddy scan only if the request len is power of |
c9de560d AT |
155 | * 2 blocks and the order of allocation is >= sbi->s_mb_order2_reqs. The |
156 | * value of s_mb_order2_reqs can be tuned via | |
b713a5ec | 157 | * /sys/fs/ext4/<partition>/mb_order2_req. If the request len is equal to |
af901ca1 | 158 | * stripe size (sbi->s_stripe), we try to search for contiguous block in |
b713a5ec TT |
159 | * stripe size. This should result in better allocation on RAID setups. If |
160 | * not, we search in the specific group using bitmap for best extents. The | |
161 | * tunable min_to_scan and max_to_scan control the behaviour here. | |
c9de560d | 162 | * min_to_scan indicate how long the mballoc __must__ look for a best |
b713a5ec | 163 | * extent and max_to_scan indicates how long the mballoc __can__ look for a |
c9de560d AT |
164 | * best extent in the found extents. Searching for the blocks starts with |
165 | * the group specified as the goal value in allocation context via | |
166 | * ac_g_ex. Each group is first checked based on the criteria whether it | |
caaf7a29 | 167 | * can be used for allocation. ext4_mb_good_group explains how the groups are |
c9de560d AT |
168 | * checked. |
169 | * | |
170 | * Both the prealloc space are getting populated as above. So for the first | |
171 | * request we will hit the buddy cache which will result in this prealloc | |
172 | * space getting filled. The prealloc space is then later used for the | |
173 | * subsequent request. | |
174 | */ | |
175 | ||
176 | /* | |
177 | * mballoc operates on the following data: | |
178 | * - on-disk bitmap | |
179 | * - in-core buddy (actually includes buddy and bitmap) | |
180 | * - preallocation descriptors (PAs) | |
181 | * | |
182 | * there are two types of preallocations: | |
183 | * - inode | |
184 | * assiged to specific inode and can be used for this inode only. | |
185 | * it describes part of inode's space preallocated to specific | |
186 | * physical blocks. any block from that preallocated can be used | |
187 | * independent. the descriptor just tracks number of blocks left | |
188 | * unused. so, before taking some block from descriptor, one must | |
189 | * make sure corresponded logical block isn't allocated yet. this | |
190 | * also means that freeing any block within descriptor's range | |
191 | * must discard all preallocated blocks. | |
192 | * - locality group | |
193 | * assigned to specific locality group which does not translate to | |
194 | * permanent set of inodes: inode can join and leave group. space | |
195 | * from this type of preallocation can be used for any inode. thus | |
196 | * it's consumed from the beginning to the end. | |
197 | * | |
198 | * relation between them can be expressed as: | |
199 | * in-core buddy = on-disk bitmap + preallocation descriptors | |
200 | * | |
201 | * this mean blocks mballoc considers used are: | |
202 | * - allocated blocks (persistent) | |
203 | * - preallocated blocks (non-persistent) | |
204 | * | |
205 | * consistency in mballoc world means that at any time a block is either | |
206 | * free or used in ALL structures. notice: "any time" should not be read | |
207 | * literally -- time is discrete and delimited by locks. | |
208 | * | |
209 | * to keep it simple, we don't use block numbers, instead we count number of | |
210 | * blocks: how many blocks marked used/free in on-disk bitmap, buddy and PA. | |
211 | * | |
212 | * all operations can be expressed as: | |
213 | * - init buddy: buddy = on-disk + PAs | |
214 | * - new PA: buddy += N; PA = N | |
215 | * - use inode PA: on-disk += N; PA -= N | |
216 | * - discard inode PA buddy -= on-disk - PA; PA = 0 | |
217 | * - use locality group PA on-disk += N; PA -= N | |
218 | * - discard locality group PA buddy -= PA; PA = 0 | |
219 | * note: 'buddy -= on-disk - PA' is used to show that on-disk bitmap | |
220 | * is used in real operation because we can't know actual used | |
221 | * bits from PA, only from on-disk bitmap | |
222 | * | |
223 | * if we follow this strict logic, then all operations above should be atomic. | |
224 | * given some of them can block, we'd have to use something like semaphores | |
225 | * killing performance on high-end SMP hardware. let's try to relax it using | |
226 | * the following knowledge: | |
227 | * 1) if buddy is referenced, it's already initialized | |
228 | * 2) while block is used in buddy and the buddy is referenced, | |
229 | * nobody can re-allocate that block | |
230 | * 3) we work on bitmaps and '+' actually means 'set bits'. if on-disk has | |
231 | * bit set and PA claims same block, it's OK. IOW, one can set bit in | |
232 | * on-disk bitmap if buddy has same bit set or/and PA covers corresponded | |
233 | * block | |
234 | * | |
235 | * so, now we're building a concurrency table: | |
236 | * - init buddy vs. | |
237 | * - new PA | |
238 | * blocks for PA are allocated in the buddy, buddy must be referenced | |
239 | * until PA is linked to allocation group to avoid concurrent buddy init | |
240 | * - use inode PA | |
241 | * we need to make sure that either on-disk bitmap or PA has uptodate data | |
242 | * given (3) we care that PA-=N operation doesn't interfere with init | |
243 | * - discard inode PA | |
244 | * the simplest way would be to have buddy initialized by the discard | |
245 | * - use locality group PA | |
246 | * again PA-=N must be serialized with init | |
247 | * - discard locality group PA | |
248 | * the simplest way would be to have buddy initialized by the discard | |
249 | * - new PA vs. | |
250 | * - use inode PA | |
251 | * i_data_sem serializes them | |
252 | * - discard inode PA | |
253 | * discard process must wait until PA isn't used by another process | |
254 | * - use locality group PA | |
255 | * some mutex should serialize them | |
256 | * - discard locality group PA | |
257 | * discard process must wait until PA isn't used by another process | |
258 | * - use inode PA | |
259 | * - use inode PA | |
260 | * i_data_sem or another mutex should serializes them | |
261 | * - discard inode PA | |
262 | * discard process must wait until PA isn't used by another process | |
263 | * - use locality group PA | |
264 | * nothing wrong here -- they're different PAs covering different blocks | |
265 | * - discard locality group PA | |
266 | * discard process must wait until PA isn't used by another process | |
267 | * | |
268 | * now we're ready to make few consequences: | |
269 | * - PA is referenced and while it is no discard is possible | |
270 | * - PA is referenced until block isn't marked in on-disk bitmap | |
271 | * - PA changes only after on-disk bitmap | |
272 | * - discard must not compete with init. either init is done before | |
273 | * any discard or they're serialized somehow | |
274 | * - buddy init as sum of on-disk bitmap and PAs is done atomically | |
275 | * | |
276 | * a special case when we've used PA to emptiness. no need to modify buddy | |
277 | * in this case, but we should care about concurrent init | |
278 | * | |
279 | */ | |
280 | ||
281 | /* | |
282 | * Logic in few words: | |
283 | * | |
284 | * - allocation: | |
285 | * load group | |
286 | * find blocks | |
287 | * mark bits in on-disk bitmap | |
288 | * release group | |
289 | * | |
290 | * - use preallocation: | |
291 | * find proper PA (per-inode or group) | |
292 | * load group | |
293 | * mark bits in on-disk bitmap | |
294 | * release group | |
295 | * release PA | |
296 | * | |
297 | * - free: | |
298 | * load group | |
299 | * mark bits in on-disk bitmap | |
300 | * release group | |
301 | * | |
302 | * - discard preallocations in group: | |
303 | * mark PAs deleted | |
304 | * move them onto local list | |
305 | * load on-disk bitmap | |
306 | * load group | |
307 | * remove PA from object (inode or locality group) | |
308 | * mark free blocks in-core | |
309 | * | |
310 | * - discard inode's preallocations: | |
311 | */ | |
312 | ||
313 | /* | |
314 | * Locking rules | |
315 | * | |
316 | * Locks: | |
317 | * - bitlock on a group (group) | |
318 | * - object (inode/locality) (object) | |
319 | * - per-pa lock (pa) | |
320 | * | |
321 | * Paths: | |
322 | * - new pa | |
323 | * object | |
324 | * group | |
325 | * | |
326 | * - find and use pa: | |
327 | * pa | |
328 | * | |
329 | * - release consumed pa: | |
330 | * pa | |
331 | * group | |
332 | * object | |
333 | * | |
334 | * - generate in-core bitmap: | |
335 | * group | |
336 | * pa | |
337 | * | |
338 | * - discard all for given object (inode, locality group): | |
339 | * object | |
340 | * pa | |
341 | * group | |
342 | * | |
343 | * - discard all for given group: | |
344 | * group | |
345 | * pa | |
346 | * group | |
347 | * object | |
348 | * | |
349 | */ | |
c3a326a6 AK |
350 | static struct kmem_cache *ext4_pspace_cachep; |
351 | static struct kmem_cache *ext4_ac_cachep; | |
18aadd47 | 352 | static struct kmem_cache *ext4_free_data_cachep; |
fb1813f4 CW |
353 | |
354 | /* We create slab caches for groupinfo data structures based on the | |
355 | * superblock block size. There will be one per mounted filesystem for | |
356 | * each unique s_blocksize_bits */ | |
2892c15d | 357 | #define NR_GRPINFO_CACHES 8 |
fb1813f4 CW |
358 | static struct kmem_cache *ext4_groupinfo_caches[NR_GRPINFO_CACHES]; |
359 | ||
2892c15d ES |
360 | static const char *ext4_groupinfo_slab_names[NR_GRPINFO_CACHES] = { |
361 | "ext4_groupinfo_1k", "ext4_groupinfo_2k", "ext4_groupinfo_4k", | |
362 | "ext4_groupinfo_8k", "ext4_groupinfo_16k", "ext4_groupinfo_32k", | |
363 | "ext4_groupinfo_64k", "ext4_groupinfo_128k" | |
364 | }; | |
365 | ||
c3a326a6 AK |
366 | static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap, |
367 | ext4_group_t group); | |
7a2fcbf7 AK |
368 | static void ext4_mb_generate_from_freelist(struct super_block *sb, void *bitmap, |
369 | ext4_group_t group); | |
18aadd47 BJ |
370 | static void ext4_free_data_callback(struct super_block *sb, |
371 | struct ext4_journal_cb_entry *jce, int rc); | |
c3a326a6 | 372 | |
ffad0a44 AK |
373 | static inline void *mb_correct_addr_and_bit(int *bit, void *addr) |
374 | { | |
c9de560d | 375 | #if BITS_PER_LONG == 64 |
ffad0a44 AK |
376 | *bit += ((unsigned long) addr & 7UL) << 3; |
377 | addr = (void *) ((unsigned long) addr & ~7UL); | |
c9de560d | 378 | #elif BITS_PER_LONG == 32 |
ffad0a44 AK |
379 | *bit += ((unsigned long) addr & 3UL) << 3; |
380 | addr = (void *) ((unsigned long) addr & ~3UL); | |
c9de560d AT |
381 | #else |
382 | #error "how many bits you are?!" | |
383 | #endif | |
ffad0a44 AK |
384 | return addr; |
385 | } | |
c9de560d AT |
386 | |
387 | static inline int mb_test_bit(int bit, void *addr) | |
388 | { | |
389 | /* | |
390 | * ext4_test_bit on architecture like powerpc | |
391 | * needs unsigned long aligned address | |
392 | */ | |
ffad0a44 | 393 | addr = mb_correct_addr_and_bit(&bit, addr); |
c9de560d AT |
394 | return ext4_test_bit(bit, addr); |
395 | } | |
396 | ||
397 | static inline void mb_set_bit(int bit, void *addr) | |
398 | { | |
ffad0a44 | 399 | addr = mb_correct_addr_and_bit(&bit, addr); |
c9de560d AT |
400 | ext4_set_bit(bit, addr); |
401 | } | |
402 | ||
c9de560d AT |
403 | static inline void mb_clear_bit(int bit, void *addr) |
404 | { | |
ffad0a44 | 405 | addr = mb_correct_addr_and_bit(&bit, addr); |
c9de560d AT |
406 | ext4_clear_bit(bit, addr); |
407 | } | |
408 | ||
eabe0444 AS |
409 | static inline int mb_test_and_clear_bit(int bit, void *addr) |
410 | { | |
411 | addr = mb_correct_addr_and_bit(&bit, addr); | |
412 | return ext4_test_and_clear_bit(bit, addr); | |
413 | } | |
414 | ||
ffad0a44 AK |
415 | static inline int mb_find_next_zero_bit(void *addr, int max, int start) |
416 | { | |
e7dfb246 | 417 | int fix = 0, ret, tmpmax; |
ffad0a44 | 418 | addr = mb_correct_addr_and_bit(&fix, addr); |
e7dfb246 | 419 | tmpmax = max + fix; |
ffad0a44 AK |
420 | start += fix; |
421 | ||
e7dfb246 AK |
422 | ret = ext4_find_next_zero_bit(addr, tmpmax, start) - fix; |
423 | if (ret > max) | |
424 | return max; | |
425 | return ret; | |
ffad0a44 AK |
426 | } |
427 | ||
428 | static inline int mb_find_next_bit(void *addr, int max, int start) | |
429 | { | |
e7dfb246 | 430 | int fix = 0, ret, tmpmax; |
ffad0a44 | 431 | addr = mb_correct_addr_and_bit(&fix, addr); |
e7dfb246 | 432 | tmpmax = max + fix; |
ffad0a44 AK |
433 | start += fix; |
434 | ||
e7dfb246 AK |
435 | ret = ext4_find_next_bit(addr, tmpmax, start) - fix; |
436 | if (ret > max) | |
437 | return max; | |
438 | return ret; | |
ffad0a44 AK |
439 | } |
440 | ||
c9de560d AT |
441 | static void *mb_find_buddy(struct ext4_buddy *e4b, int order, int *max) |
442 | { | |
443 | char *bb; | |
444 | ||
c5e8f3f3 | 445 | BUG_ON(e4b->bd_bitmap == e4b->bd_buddy); |
c9de560d AT |
446 | BUG_ON(max == NULL); |
447 | ||
448 | if (order > e4b->bd_blkbits + 1) { | |
449 | *max = 0; | |
450 | return NULL; | |
451 | } | |
452 | ||
453 | /* at order 0 we see each particular block */ | |
84b775a3 CL |
454 | if (order == 0) { |
455 | *max = 1 << (e4b->bd_blkbits + 3); | |
c5e8f3f3 | 456 | return e4b->bd_bitmap; |
84b775a3 | 457 | } |
c9de560d | 458 | |
c5e8f3f3 | 459 | bb = e4b->bd_buddy + EXT4_SB(e4b->bd_sb)->s_mb_offsets[order]; |
c9de560d AT |
460 | *max = EXT4_SB(e4b->bd_sb)->s_mb_maxs[order]; |
461 | ||
462 | return bb; | |
463 | } | |
464 | ||
465 | #ifdef DOUBLE_CHECK | |
466 | static void mb_free_blocks_double(struct inode *inode, struct ext4_buddy *e4b, | |
467 | int first, int count) | |
468 | { | |
469 | int i; | |
470 | struct super_block *sb = e4b->bd_sb; | |
471 | ||
472 | if (unlikely(e4b->bd_info->bb_bitmap == NULL)) | |
473 | return; | |
bc8e6740 | 474 | assert_spin_locked(ext4_group_lock_ptr(sb, e4b->bd_group)); |
c9de560d AT |
475 | for (i = 0; i < count; i++) { |
476 | if (!mb_test_bit(first + i, e4b->bd_info->bb_bitmap)) { | |
477 | ext4_fsblk_t blocknr; | |
5661bd68 AM |
478 | |
479 | blocknr = ext4_group_first_block_no(sb, e4b->bd_group); | |
53accfa9 | 480 | blocknr += EXT4_C2B(EXT4_SB(sb), first + i); |
5d1b1b3f | 481 | ext4_grp_locked_error(sb, e4b->bd_group, |
e29136f8 TT |
482 | inode ? inode->i_ino : 0, |
483 | blocknr, | |
484 | "freeing block already freed " | |
485 | "(bit %u)", | |
486 | first + i); | |
c9de560d AT |
487 | } |
488 | mb_clear_bit(first + i, e4b->bd_info->bb_bitmap); | |
489 | } | |
490 | } | |
491 | ||
492 | static void mb_mark_used_double(struct ext4_buddy *e4b, int first, int count) | |
493 | { | |
494 | int i; | |
495 | ||
496 | if (unlikely(e4b->bd_info->bb_bitmap == NULL)) | |
497 | return; | |
bc8e6740 | 498 | assert_spin_locked(ext4_group_lock_ptr(e4b->bd_sb, e4b->bd_group)); |
c9de560d AT |
499 | for (i = 0; i < count; i++) { |
500 | BUG_ON(mb_test_bit(first + i, e4b->bd_info->bb_bitmap)); | |
501 | mb_set_bit(first + i, e4b->bd_info->bb_bitmap); | |
502 | } | |
503 | } | |
504 | ||
505 | static void mb_cmp_bitmaps(struct ext4_buddy *e4b, void *bitmap) | |
506 | { | |
507 | if (memcmp(e4b->bd_info->bb_bitmap, bitmap, e4b->bd_sb->s_blocksize)) { | |
508 | unsigned char *b1, *b2; | |
509 | int i; | |
510 | b1 = (unsigned char *) e4b->bd_info->bb_bitmap; | |
511 | b2 = (unsigned char *) bitmap; | |
512 | for (i = 0; i < e4b->bd_sb->s_blocksize; i++) { | |
513 | if (b1[i] != b2[i]) { | |
9d8b9ec4 TT |
514 | ext4_msg(e4b->bd_sb, KERN_ERR, |
515 | "corruption in group %u " | |
516 | "at byte %u(%u): %x in copy != %x " | |
517 | "on disk/prealloc", | |
518 | e4b->bd_group, i, i * 8, b1[i], b2[i]); | |
c9de560d AT |
519 | BUG(); |
520 | } | |
521 | } | |
522 | } | |
523 | } | |
524 | ||
525 | #else | |
526 | static inline void mb_free_blocks_double(struct inode *inode, | |
527 | struct ext4_buddy *e4b, int first, int count) | |
528 | { | |
529 | return; | |
530 | } | |
531 | static inline void mb_mark_used_double(struct ext4_buddy *e4b, | |
532 | int first, int count) | |
533 | { | |
534 | return; | |
535 | } | |
536 | static inline void mb_cmp_bitmaps(struct ext4_buddy *e4b, void *bitmap) | |
537 | { | |
538 | return; | |
539 | } | |
540 | #endif | |
541 | ||
542 | #ifdef AGGRESSIVE_CHECK | |
543 | ||
544 | #define MB_CHECK_ASSERT(assert) \ | |
545 | do { \ | |
546 | if (!(assert)) { \ | |
547 | printk(KERN_EMERG \ | |
548 | "Assertion failure in %s() at %s:%d: \"%s\"\n", \ | |
549 | function, file, line, # assert); \ | |
550 | BUG(); \ | |
551 | } \ | |
552 | } while (0) | |
553 | ||
554 | static int __mb_check_buddy(struct ext4_buddy *e4b, char *file, | |
555 | const char *function, int line) | |
556 | { | |
557 | struct super_block *sb = e4b->bd_sb; | |
558 | int order = e4b->bd_blkbits + 1; | |
559 | int max; | |
560 | int max2; | |
561 | int i; | |
562 | int j; | |
563 | int k; | |
564 | int count; | |
565 | struct ext4_group_info *grp; | |
566 | int fragments = 0; | |
567 | int fstart; | |
568 | struct list_head *cur; | |
569 | void *buddy; | |
570 | void *buddy2; | |
571 | ||
c9de560d AT |
572 | { |
573 | static int mb_check_counter; | |
574 | if (mb_check_counter++ % 100 != 0) | |
575 | return 0; | |
576 | } | |
577 | ||
578 | while (order > 1) { | |
579 | buddy = mb_find_buddy(e4b, order, &max); | |
580 | MB_CHECK_ASSERT(buddy); | |
581 | buddy2 = mb_find_buddy(e4b, order - 1, &max2); | |
582 | MB_CHECK_ASSERT(buddy2); | |
583 | MB_CHECK_ASSERT(buddy != buddy2); | |
584 | MB_CHECK_ASSERT(max * 2 == max2); | |
585 | ||
586 | count = 0; | |
587 | for (i = 0; i < max; i++) { | |
588 | ||
589 | if (mb_test_bit(i, buddy)) { | |
590 | /* only single bit in buddy2 may be 1 */ | |
591 | if (!mb_test_bit(i << 1, buddy2)) { | |
592 | MB_CHECK_ASSERT( | |
593 | mb_test_bit((i<<1)+1, buddy2)); | |
594 | } else if (!mb_test_bit((i << 1) + 1, buddy2)) { | |
595 | MB_CHECK_ASSERT( | |
596 | mb_test_bit(i << 1, buddy2)); | |
597 | } | |
598 | continue; | |
599 | } | |
600 | ||
0a10da73 | 601 | /* both bits in buddy2 must be 1 */ |
c9de560d AT |
602 | MB_CHECK_ASSERT(mb_test_bit(i << 1, buddy2)); |
603 | MB_CHECK_ASSERT(mb_test_bit((i << 1) + 1, buddy2)); | |
604 | ||
605 | for (j = 0; j < (1 << order); j++) { | |
606 | k = (i * (1 << order)) + j; | |
607 | MB_CHECK_ASSERT( | |
c5e8f3f3 | 608 | !mb_test_bit(k, e4b->bd_bitmap)); |
c9de560d AT |
609 | } |
610 | count++; | |
611 | } | |
612 | MB_CHECK_ASSERT(e4b->bd_info->bb_counters[order] == count); | |
613 | order--; | |
614 | } | |
615 | ||
616 | fstart = -1; | |
617 | buddy = mb_find_buddy(e4b, 0, &max); | |
618 | for (i = 0; i < max; i++) { | |
619 | if (!mb_test_bit(i, buddy)) { | |
620 | MB_CHECK_ASSERT(i >= e4b->bd_info->bb_first_free); | |
621 | if (fstart == -1) { | |
622 | fragments++; | |
623 | fstart = i; | |
624 | } | |
625 | continue; | |
626 | } | |
627 | fstart = -1; | |
628 | /* check used bits only */ | |
629 | for (j = 0; j < e4b->bd_blkbits + 1; j++) { | |
630 | buddy2 = mb_find_buddy(e4b, j, &max2); | |
631 | k = i >> j; | |
632 | MB_CHECK_ASSERT(k < max2); | |
633 | MB_CHECK_ASSERT(mb_test_bit(k, buddy2)); | |
634 | } | |
635 | } | |
636 | MB_CHECK_ASSERT(!EXT4_MB_GRP_NEED_INIT(e4b->bd_info)); | |
637 | MB_CHECK_ASSERT(e4b->bd_info->bb_fragments == fragments); | |
638 | ||
639 | grp = ext4_get_group_info(sb, e4b->bd_group); | |
c9de560d AT |
640 | list_for_each(cur, &grp->bb_prealloc_list) { |
641 | ext4_group_t groupnr; | |
642 | struct ext4_prealloc_space *pa; | |
60bd63d1 SR |
643 | pa = list_entry(cur, struct ext4_prealloc_space, pa_group_list); |
644 | ext4_get_group_no_and_offset(sb, pa->pa_pstart, &groupnr, &k); | |
c9de560d | 645 | MB_CHECK_ASSERT(groupnr == e4b->bd_group); |
60bd63d1 | 646 | for (i = 0; i < pa->pa_len; i++) |
c9de560d AT |
647 | MB_CHECK_ASSERT(mb_test_bit(k + i, buddy)); |
648 | } | |
649 | return 0; | |
650 | } | |
651 | #undef MB_CHECK_ASSERT | |
652 | #define mb_check_buddy(e4b) __mb_check_buddy(e4b, \ | |
46e665e9 | 653 | __FILE__, __func__, __LINE__) |
c9de560d AT |
654 | #else |
655 | #define mb_check_buddy(e4b) | |
656 | #endif | |
657 | ||
7c786059 CL |
658 | /* |
659 | * Divide blocks started from @first with length @len into | |
660 | * smaller chunks with power of 2 blocks. | |
661 | * Clear the bits in bitmap which the blocks of the chunk(s) covered, | |
662 | * then increase bb_counters[] for corresponded chunk size. | |
663 | */ | |
c9de560d | 664 | static void ext4_mb_mark_free_simple(struct super_block *sb, |
a36b4498 | 665 | void *buddy, ext4_grpblk_t first, ext4_grpblk_t len, |
c9de560d AT |
666 | struct ext4_group_info *grp) |
667 | { | |
668 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
a36b4498 ES |
669 | ext4_grpblk_t min; |
670 | ext4_grpblk_t max; | |
671 | ext4_grpblk_t chunk; | |
c9de560d AT |
672 | unsigned short border; |
673 | ||
7137d7a4 | 674 | BUG_ON(len > EXT4_CLUSTERS_PER_GROUP(sb)); |
c9de560d AT |
675 | |
676 | border = 2 << sb->s_blocksize_bits; | |
677 | ||
678 | while (len > 0) { | |
679 | /* find how many blocks can be covered since this position */ | |
680 | max = ffs(first | border) - 1; | |
681 | ||
682 | /* find how many blocks of power 2 we need to mark */ | |
683 | min = fls(len) - 1; | |
684 | ||
685 | if (max < min) | |
686 | min = max; | |
687 | chunk = 1 << min; | |
688 | ||
689 | /* mark multiblock chunks only */ | |
690 | grp->bb_counters[min]++; | |
691 | if (min > 0) | |
692 | mb_clear_bit(first >> min, | |
693 | buddy + sbi->s_mb_offsets[min]); | |
694 | ||
695 | len -= chunk; | |
696 | first += chunk; | |
697 | } | |
698 | } | |
699 | ||
8a57d9d6 CW |
700 | /* |
701 | * Cache the order of the largest free extent we have available in this block | |
702 | * group. | |
703 | */ | |
704 | static void | |
705 | mb_set_largest_free_order(struct super_block *sb, struct ext4_group_info *grp) | |
706 | { | |
707 | int i; | |
708 | int bits; | |
709 | ||
710 | grp->bb_largest_free_order = -1; /* uninit */ | |
711 | ||
712 | bits = sb->s_blocksize_bits + 1; | |
713 | for (i = bits; i >= 0; i--) { | |
714 | if (grp->bb_counters[i] > 0) { | |
715 | grp->bb_largest_free_order = i; | |
716 | break; | |
717 | } | |
718 | } | |
719 | } | |
720 | ||
089ceecc ES |
721 | static noinline_for_stack |
722 | void ext4_mb_generate_buddy(struct super_block *sb, | |
c9de560d AT |
723 | void *buddy, void *bitmap, ext4_group_t group) |
724 | { | |
725 | struct ext4_group_info *grp = ext4_get_group_info(sb, group); | |
e43bb4e6 | 726 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
7137d7a4 | 727 | ext4_grpblk_t max = EXT4_CLUSTERS_PER_GROUP(sb); |
a36b4498 ES |
728 | ext4_grpblk_t i = 0; |
729 | ext4_grpblk_t first; | |
730 | ext4_grpblk_t len; | |
c9de560d AT |
731 | unsigned free = 0; |
732 | unsigned fragments = 0; | |
733 | unsigned long long period = get_cycles(); | |
734 | ||
735 | /* initialize buddy from bitmap which is aggregation | |
736 | * of on-disk bitmap and preallocations */ | |
ffad0a44 | 737 | i = mb_find_next_zero_bit(bitmap, max, 0); |
c9de560d AT |
738 | grp->bb_first_free = i; |
739 | while (i < max) { | |
740 | fragments++; | |
741 | first = i; | |
ffad0a44 | 742 | i = mb_find_next_bit(bitmap, max, i); |
c9de560d AT |
743 | len = i - first; |
744 | free += len; | |
745 | if (len > 1) | |
746 | ext4_mb_mark_free_simple(sb, buddy, first, len, grp); | |
747 | else | |
748 | grp->bb_counters[0]++; | |
749 | if (i < max) | |
ffad0a44 | 750 | i = mb_find_next_zero_bit(bitmap, max, i); |
c9de560d AT |
751 | } |
752 | grp->bb_fragments = fragments; | |
753 | ||
754 | if (free != grp->bb_free) { | |
e29136f8 | 755 | ext4_grp_locked_error(sb, group, 0, 0, |
94d4c066 TT |
756 | "block bitmap and bg descriptor " |
757 | "inconsistent: %u vs %u free clusters", | |
e29136f8 | 758 | free, grp->bb_free); |
e56eb659 | 759 | /* |
163a203d | 760 | * If we intend to continue, we consider group descriptor |
e56eb659 AK |
761 | * corrupt and update bb_free using bitmap value |
762 | */ | |
c9de560d | 763 | grp->bb_free = free; |
e43bb4e6 NJ |
764 | if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp)) |
765 | percpu_counter_sub(&sbi->s_freeclusters_counter, | |
766 | grp->bb_free); | |
163a203d | 767 | set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state); |
c9de560d | 768 | } |
8a57d9d6 | 769 | mb_set_largest_free_order(sb, grp); |
c9de560d AT |
770 | |
771 | clear_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &(grp->bb_state)); | |
772 | ||
773 | period = get_cycles() - period; | |
774 | spin_lock(&EXT4_SB(sb)->s_bal_lock); | |
775 | EXT4_SB(sb)->s_mb_buddies_generated++; | |
776 | EXT4_SB(sb)->s_mb_generation_time += period; | |
777 | spin_unlock(&EXT4_SB(sb)->s_bal_lock); | |
778 | } | |
779 | ||
eabe0444 AS |
780 | static void mb_regenerate_buddy(struct ext4_buddy *e4b) |
781 | { | |
782 | int count; | |
783 | int order = 1; | |
784 | void *buddy; | |
785 | ||
786 | while ((buddy = mb_find_buddy(e4b, order++, &count))) { | |
787 | ext4_set_bits(buddy, 0, count); | |
788 | } | |
789 | e4b->bd_info->bb_fragments = 0; | |
790 | memset(e4b->bd_info->bb_counters, 0, | |
791 | sizeof(*e4b->bd_info->bb_counters) * | |
792 | (e4b->bd_sb->s_blocksize_bits + 2)); | |
793 | ||
794 | ext4_mb_generate_buddy(e4b->bd_sb, e4b->bd_buddy, | |
795 | e4b->bd_bitmap, e4b->bd_group); | |
796 | } | |
797 | ||
c9de560d AT |
798 | /* The buddy information is attached the buddy cache inode |
799 | * for convenience. The information regarding each group | |
800 | * is loaded via ext4_mb_load_buddy. The information involve | |
801 | * block bitmap and buddy information. The information are | |
802 | * stored in the inode as | |
803 | * | |
804 | * { page } | |
c3a326a6 | 805 | * [ group 0 bitmap][ group 0 buddy] [group 1][ group 1]... |
c9de560d AT |
806 | * |
807 | * | |
808 | * one block each for bitmap and buddy information. | |
809 | * So for each group we take up 2 blocks. A page can | |
810 | * contain blocks_per_page (PAGE_CACHE_SIZE / blocksize) blocks. | |
811 | * So it can have information regarding groups_per_page which | |
812 | * is blocks_per_page/2 | |
8a57d9d6 CW |
813 | * |
814 | * Locking note: This routine takes the block group lock of all groups | |
815 | * for this page; do not hold this lock when calling this routine! | |
c9de560d AT |
816 | */ |
817 | ||
818 | static int ext4_mb_init_cache(struct page *page, char *incore) | |
819 | { | |
8df9675f | 820 | ext4_group_t ngroups; |
c9de560d AT |
821 | int blocksize; |
822 | int blocks_per_page; | |
823 | int groups_per_page; | |
824 | int err = 0; | |
825 | int i; | |
813e5727 | 826 | ext4_group_t first_group, group; |
c9de560d AT |
827 | int first_block; |
828 | struct super_block *sb; | |
829 | struct buffer_head *bhs; | |
fa77dcfa | 830 | struct buffer_head **bh = NULL; |
c9de560d AT |
831 | struct inode *inode; |
832 | char *data; | |
833 | char *bitmap; | |
9b8b7d35 | 834 | struct ext4_group_info *grinfo; |
c9de560d | 835 | |
6ba495e9 | 836 | mb_debug(1, "init page %lu\n", page->index); |
c9de560d AT |
837 | |
838 | inode = page->mapping->host; | |
839 | sb = inode->i_sb; | |
8df9675f | 840 | ngroups = ext4_get_groups_count(sb); |
c9de560d AT |
841 | blocksize = 1 << inode->i_blkbits; |
842 | blocks_per_page = PAGE_CACHE_SIZE / blocksize; | |
843 | ||
844 | groups_per_page = blocks_per_page >> 1; | |
845 | if (groups_per_page == 0) | |
846 | groups_per_page = 1; | |
847 | ||
848 | /* allocate buffer_heads to read bitmaps */ | |
849 | if (groups_per_page > 1) { | |
c9de560d AT |
850 | i = sizeof(struct buffer_head *) * groups_per_page; |
851 | bh = kzalloc(i, GFP_NOFS); | |
813e5727 TT |
852 | if (bh == NULL) { |
853 | err = -ENOMEM; | |
c9de560d | 854 | goto out; |
813e5727 | 855 | } |
c9de560d AT |
856 | } else |
857 | bh = &bhs; | |
858 | ||
859 | first_group = page->index * blocks_per_page / 2; | |
860 | ||
861 | /* read all groups the page covers into the cache */ | |
813e5727 TT |
862 | for (i = 0, group = first_group; i < groups_per_page; i++, group++) { |
863 | if (group >= ngroups) | |
c9de560d AT |
864 | break; |
865 | ||
813e5727 | 866 | grinfo = ext4_get_group_info(sb, group); |
9b8b7d35 AG |
867 | /* |
868 | * If page is uptodate then we came here after online resize | |
869 | * which added some new uninitialized group info structs, so | |
870 | * we must skip all initialized uptodate buddies on the page, | |
871 | * which may be currently in use by an allocating task. | |
872 | */ | |
873 | if (PageUptodate(page) && !EXT4_MB_GRP_NEED_INIT(grinfo)) { | |
874 | bh[i] = NULL; | |
875 | continue; | |
876 | } | |
813e5727 TT |
877 | if (!(bh[i] = ext4_read_block_bitmap_nowait(sb, group))) { |
878 | err = -ENOMEM; | |
c9de560d | 879 | goto out; |
2ccb5fb9 | 880 | } |
813e5727 | 881 | mb_debug(1, "read bitmap for group %u\n", group); |
c9de560d AT |
882 | } |
883 | ||
884 | /* wait for I/O completion */ | |
813e5727 | 885 | for (i = 0, group = first_group; i < groups_per_page; i++, group++) { |
bbdc322f | 886 | if (bh[i] && ext4_wait_block_bitmap(sb, group, bh[i])) |
813e5727 | 887 | err = -EIO; |
813e5727 | 888 | } |
c9de560d AT |
889 | |
890 | first_block = page->index * blocks_per_page; | |
891 | for (i = 0; i < blocks_per_page; i++) { | |
c9de560d | 892 | group = (first_block + i) >> 1; |
8df9675f | 893 | if (group >= ngroups) |
c9de560d AT |
894 | break; |
895 | ||
9b8b7d35 AG |
896 | if (!bh[group - first_group]) |
897 | /* skip initialized uptodate buddy */ | |
898 | continue; | |
899 | ||
bbdc322f LC |
900 | if (!buffer_verified(bh[group - first_group])) |
901 | /* Skip faulty bitmaps */ | |
902 | continue; | |
903 | err = 0; | |
904 | ||
c9de560d AT |
905 | /* |
906 | * data carry information regarding this | |
907 | * particular group in the format specified | |
908 | * above | |
909 | * | |
910 | */ | |
911 | data = page_address(page) + (i * blocksize); | |
912 | bitmap = bh[group - first_group]->b_data; | |
913 | ||
914 | /* | |
915 | * We place the buddy block and bitmap block | |
916 | * close together | |
917 | */ | |
918 | if ((first_block + i) & 1) { | |
919 | /* this is block of buddy */ | |
920 | BUG_ON(incore == NULL); | |
6ba495e9 | 921 | mb_debug(1, "put buddy for group %u in page %lu/%x\n", |
c9de560d | 922 | group, page->index, i * blocksize); |
f307333e | 923 | trace_ext4_mb_buddy_bitmap_load(sb, group); |
c9de560d AT |
924 | grinfo = ext4_get_group_info(sb, group); |
925 | grinfo->bb_fragments = 0; | |
926 | memset(grinfo->bb_counters, 0, | |
1927805e ES |
927 | sizeof(*grinfo->bb_counters) * |
928 | (sb->s_blocksize_bits+2)); | |
c9de560d AT |
929 | /* |
930 | * incore got set to the group block bitmap below | |
931 | */ | |
7a2fcbf7 | 932 | ext4_lock_group(sb, group); |
9b8b7d35 AG |
933 | /* init the buddy */ |
934 | memset(data, 0xff, blocksize); | |
c9de560d | 935 | ext4_mb_generate_buddy(sb, data, incore, group); |
7a2fcbf7 | 936 | ext4_unlock_group(sb, group); |
c9de560d AT |
937 | incore = NULL; |
938 | } else { | |
939 | /* this is block of bitmap */ | |
940 | BUG_ON(incore != NULL); | |
6ba495e9 | 941 | mb_debug(1, "put bitmap for group %u in page %lu/%x\n", |
c9de560d | 942 | group, page->index, i * blocksize); |
f307333e | 943 | trace_ext4_mb_bitmap_load(sb, group); |
c9de560d AT |
944 | |
945 | /* see comments in ext4_mb_put_pa() */ | |
946 | ext4_lock_group(sb, group); | |
947 | memcpy(data, bitmap, blocksize); | |
948 | ||
949 | /* mark all preallocated blks used in in-core bitmap */ | |
950 | ext4_mb_generate_from_pa(sb, data, group); | |
7a2fcbf7 | 951 | ext4_mb_generate_from_freelist(sb, data, group); |
c9de560d AT |
952 | ext4_unlock_group(sb, group); |
953 | ||
954 | /* set incore so that the buddy information can be | |
955 | * generated using this | |
956 | */ | |
957 | incore = data; | |
958 | } | |
959 | } | |
960 | SetPageUptodate(page); | |
961 | ||
962 | out: | |
963 | if (bh) { | |
9b8b7d35 | 964 | for (i = 0; i < groups_per_page; i++) |
c9de560d AT |
965 | brelse(bh[i]); |
966 | if (bh != &bhs) | |
967 | kfree(bh); | |
968 | } | |
969 | return err; | |
970 | } | |
971 | ||
eee4adc7 | 972 | /* |
2de8807b AG |
973 | * Lock the buddy and bitmap pages. This make sure other parallel init_group |
974 | * on the same buddy page doesn't happen whild holding the buddy page lock. | |
975 | * Return locked buddy and bitmap pages on e4b struct. If buddy and bitmap | |
976 | * are on the same page e4b->bd_buddy_page is NULL and return value is 0. | |
eee4adc7 | 977 | */ |
2de8807b AG |
978 | static int ext4_mb_get_buddy_page_lock(struct super_block *sb, |
979 | ext4_group_t group, struct ext4_buddy *e4b) | |
eee4adc7 | 980 | { |
2de8807b AG |
981 | struct inode *inode = EXT4_SB(sb)->s_buddy_cache; |
982 | int block, pnum, poff; | |
eee4adc7 | 983 | int blocks_per_page; |
2de8807b AG |
984 | struct page *page; |
985 | ||
986 | e4b->bd_buddy_page = NULL; | |
987 | e4b->bd_bitmap_page = NULL; | |
eee4adc7 ES |
988 | |
989 | blocks_per_page = PAGE_CACHE_SIZE / sb->s_blocksize; | |
990 | /* | |
991 | * the buddy cache inode stores the block bitmap | |
992 | * and buddy information in consecutive blocks. | |
993 | * So for each group we need two blocks. | |
994 | */ | |
995 | block = group * 2; | |
996 | pnum = block / blocks_per_page; | |
2de8807b AG |
997 | poff = block % blocks_per_page; |
998 | page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS); | |
999 | if (!page) | |
c57ab39b | 1000 | return -ENOMEM; |
2de8807b AG |
1001 | BUG_ON(page->mapping != inode->i_mapping); |
1002 | e4b->bd_bitmap_page = page; | |
1003 | e4b->bd_bitmap = page_address(page) + (poff * sb->s_blocksize); | |
1004 | ||
1005 | if (blocks_per_page >= 2) { | |
1006 | /* buddy and bitmap are on the same page */ | |
1007 | return 0; | |
eee4adc7 | 1008 | } |
2de8807b AG |
1009 | |
1010 | block++; | |
1011 | pnum = block / blocks_per_page; | |
2de8807b AG |
1012 | page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS); |
1013 | if (!page) | |
c57ab39b | 1014 | return -ENOMEM; |
2de8807b AG |
1015 | BUG_ON(page->mapping != inode->i_mapping); |
1016 | e4b->bd_buddy_page = page; | |
1017 | return 0; | |
eee4adc7 ES |
1018 | } |
1019 | ||
2de8807b | 1020 | static void ext4_mb_put_buddy_page_lock(struct ext4_buddy *e4b) |
eee4adc7 | 1021 | { |
2de8807b AG |
1022 | if (e4b->bd_bitmap_page) { |
1023 | unlock_page(e4b->bd_bitmap_page); | |
1024 | page_cache_release(e4b->bd_bitmap_page); | |
1025 | } | |
1026 | if (e4b->bd_buddy_page) { | |
1027 | unlock_page(e4b->bd_buddy_page); | |
1028 | page_cache_release(e4b->bd_buddy_page); | |
eee4adc7 | 1029 | } |
eee4adc7 ES |
1030 | } |
1031 | ||
8a57d9d6 CW |
1032 | /* |
1033 | * Locking note: This routine calls ext4_mb_init_cache(), which takes the | |
1034 | * block group lock of all groups for this page; do not hold the BG lock when | |
1035 | * calling this routine! | |
1036 | */ | |
b6a758ec AK |
1037 | static noinline_for_stack |
1038 | int ext4_mb_init_group(struct super_block *sb, ext4_group_t group) | |
1039 | { | |
1040 | ||
b6a758ec | 1041 | struct ext4_group_info *this_grp; |
2de8807b AG |
1042 | struct ext4_buddy e4b; |
1043 | struct page *page; | |
1044 | int ret = 0; | |
b6a758ec | 1045 | |
b10a44c3 | 1046 | might_sleep(); |
b6a758ec | 1047 | mb_debug(1, "init group %u\n", group); |
b6a758ec AK |
1048 | this_grp = ext4_get_group_info(sb, group); |
1049 | /* | |
08c3a813 AK |
1050 | * This ensures that we don't reinit the buddy cache |
1051 | * page which map to the group from which we are already | |
1052 | * allocating. If we are looking at the buddy cache we would | |
1053 | * have taken a reference using ext4_mb_load_buddy and that | |
2de8807b | 1054 | * would have pinned buddy page to page cache. |
2457aec6 MG |
1055 | * The call to ext4_mb_get_buddy_page_lock will mark the |
1056 | * page accessed. | |
b6a758ec | 1057 | */ |
2de8807b AG |
1058 | ret = ext4_mb_get_buddy_page_lock(sb, group, &e4b); |
1059 | if (ret || !EXT4_MB_GRP_NEED_INIT(this_grp)) { | |
b6a758ec AK |
1060 | /* |
1061 | * somebody initialized the group | |
1062 | * return without doing anything | |
1063 | */ | |
b6a758ec AK |
1064 | goto err; |
1065 | } | |
2de8807b AG |
1066 | |
1067 | page = e4b.bd_bitmap_page; | |
1068 | ret = ext4_mb_init_cache(page, NULL); | |
1069 | if (ret) | |
1070 | goto err; | |
1071 | if (!PageUptodate(page)) { | |
b6a758ec AK |
1072 | ret = -EIO; |
1073 | goto err; | |
1074 | } | |
b6a758ec | 1075 | |
2de8807b | 1076 | if (e4b.bd_buddy_page == NULL) { |
b6a758ec AK |
1077 | /* |
1078 | * If both the bitmap and buddy are in | |
1079 | * the same page we don't need to force | |
1080 | * init the buddy | |
1081 | */ | |
2de8807b AG |
1082 | ret = 0; |
1083 | goto err; | |
b6a758ec | 1084 | } |
2de8807b AG |
1085 | /* init buddy cache */ |
1086 | page = e4b.bd_buddy_page; | |
1087 | ret = ext4_mb_init_cache(page, e4b.bd_bitmap); | |
1088 | if (ret) | |
1089 | goto err; | |
1090 | if (!PageUptodate(page)) { | |
b6a758ec AK |
1091 | ret = -EIO; |
1092 | goto err; | |
1093 | } | |
b6a758ec | 1094 | err: |
2de8807b | 1095 | ext4_mb_put_buddy_page_lock(&e4b); |
b6a758ec AK |
1096 | return ret; |
1097 | } | |
1098 | ||
8a57d9d6 CW |
1099 | /* |
1100 | * Locking note: This routine calls ext4_mb_init_cache(), which takes the | |
1101 | * block group lock of all groups for this page; do not hold the BG lock when | |
1102 | * calling this routine! | |
1103 | */ | |
4ddfef7b ES |
1104 | static noinline_for_stack int |
1105 | ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group, | |
1106 | struct ext4_buddy *e4b) | |
c9de560d | 1107 | { |
c9de560d AT |
1108 | int blocks_per_page; |
1109 | int block; | |
1110 | int pnum; | |
1111 | int poff; | |
1112 | struct page *page; | |
fdf6c7a7 | 1113 | int ret; |
920313a7 AK |
1114 | struct ext4_group_info *grp; |
1115 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1116 | struct inode *inode = sbi->s_buddy_cache; | |
c9de560d | 1117 | |
b10a44c3 | 1118 | might_sleep(); |
6ba495e9 | 1119 | mb_debug(1, "load group %u\n", group); |
c9de560d AT |
1120 | |
1121 | blocks_per_page = PAGE_CACHE_SIZE / sb->s_blocksize; | |
920313a7 | 1122 | grp = ext4_get_group_info(sb, group); |
c9de560d AT |
1123 | |
1124 | e4b->bd_blkbits = sb->s_blocksize_bits; | |
529da704 | 1125 | e4b->bd_info = grp; |
c9de560d AT |
1126 | e4b->bd_sb = sb; |
1127 | e4b->bd_group = group; | |
1128 | e4b->bd_buddy_page = NULL; | |
1129 | e4b->bd_bitmap_page = NULL; | |
1130 | ||
f41c0750 | 1131 | if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) { |
f41c0750 AK |
1132 | /* |
1133 | * we need full data about the group | |
1134 | * to make a good selection | |
1135 | */ | |
1136 | ret = ext4_mb_init_group(sb, group); | |
1137 | if (ret) | |
1138 | return ret; | |
f41c0750 AK |
1139 | } |
1140 | ||
c9de560d AT |
1141 | /* |
1142 | * the buddy cache inode stores the block bitmap | |
1143 | * and buddy information in consecutive blocks. | |
1144 | * So for each group we need two blocks. | |
1145 | */ | |
1146 | block = group * 2; | |
1147 | pnum = block / blocks_per_page; | |
1148 | poff = block % blocks_per_page; | |
1149 | ||
1150 | /* we could use find_or_create_page(), but it locks page | |
1151 | * what we'd like to avoid in fast path ... */ | |
2457aec6 | 1152 | page = find_get_page_flags(inode->i_mapping, pnum, FGP_ACCESSED); |
c9de560d AT |
1153 | if (page == NULL || !PageUptodate(page)) { |
1154 | if (page) | |
920313a7 AK |
1155 | /* |
1156 | * drop the page reference and try | |
1157 | * to get the page with lock. If we | |
1158 | * are not uptodate that implies | |
1159 | * somebody just created the page but | |
1160 | * is yet to initialize the same. So | |
1161 | * wait for it to initialize. | |
1162 | */ | |
c9de560d AT |
1163 | page_cache_release(page); |
1164 | page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS); | |
1165 | if (page) { | |
1166 | BUG_ON(page->mapping != inode->i_mapping); | |
1167 | if (!PageUptodate(page)) { | |
fdf6c7a7 SF |
1168 | ret = ext4_mb_init_cache(page, NULL); |
1169 | if (ret) { | |
1170 | unlock_page(page); | |
1171 | goto err; | |
1172 | } | |
c9de560d AT |
1173 | mb_cmp_bitmaps(e4b, page_address(page) + |
1174 | (poff * sb->s_blocksize)); | |
1175 | } | |
1176 | unlock_page(page); | |
1177 | } | |
1178 | } | |
c57ab39b YL |
1179 | if (page == NULL) { |
1180 | ret = -ENOMEM; | |
1181 | goto err; | |
1182 | } | |
1183 | if (!PageUptodate(page)) { | |
fdf6c7a7 | 1184 | ret = -EIO; |
c9de560d | 1185 | goto err; |
fdf6c7a7 | 1186 | } |
2457aec6 MG |
1187 | |
1188 | /* Pages marked accessed already */ | |
c9de560d AT |
1189 | e4b->bd_bitmap_page = page; |
1190 | e4b->bd_bitmap = page_address(page) + (poff * sb->s_blocksize); | |
c9de560d AT |
1191 | |
1192 | block++; | |
1193 | pnum = block / blocks_per_page; | |
1194 | poff = block % blocks_per_page; | |
1195 | ||
2457aec6 | 1196 | page = find_get_page_flags(inode->i_mapping, pnum, FGP_ACCESSED); |
c9de560d AT |
1197 | if (page == NULL || !PageUptodate(page)) { |
1198 | if (page) | |
1199 | page_cache_release(page); | |
1200 | page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS); | |
1201 | if (page) { | |
1202 | BUG_ON(page->mapping != inode->i_mapping); | |
fdf6c7a7 SF |
1203 | if (!PageUptodate(page)) { |
1204 | ret = ext4_mb_init_cache(page, e4b->bd_bitmap); | |
1205 | if (ret) { | |
1206 | unlock_page(page); | |
1207 | goto err; | |
1208 | } | |
1209 | } | |
c9de560d AT |
1210 | unlock_page(page); |
1211 | } | |
1212 | } | |
c57ab39b YL |
1213 | if (page == NULL) { |
1214 | ret = -ENOMEM; | |
1215 | goto err; | |
1216 | } | |
1217 | if (!PageUptodate(page)) { | |
fdf6c7a7 | 1218 | ret = -EIO; |
c9de560d | 1219 | goto err; |
fdf6c7a7 | 1220 | } |
2457aec6 MG |
1221 | |
1222 | /* Pages marked accessed already */ | |
c9de560d AT |
1223 | e4b->bd_buddy_page = page; |
1224 | e4b->bd_buddy = page_address(page) + (poff * sb->s_blocksize); | |
c9de560d AT |
1225 | |
1226 | BUG_ON(e4b->bd_bitmap_page == NULL); | |
1227 | BUG_ON(e4b->bd_buddy_page == NULL); | |
1228 | ||
1229 | return 0; | |
1230 | ||
1231 | err: | |
26626f11 YR |
1232 | if (page) |
1233 | page_cache_release(page); | |
c9de560d AT |
1234 | if (e4b->bd_bitmap_page) |
1235 | page_cache_release(e4b->bd_bitmap_page); | |
1236 | if (e4b->bd_buddy_page) | |
1237 | page_cache_release(e4b->bd_buddy_page); | |
1238 | e4b->bd_buddy = NULL; | |
1239 | e4b->bd_bitmap = NULL; | |
fdf6c7a7 | 1240 | return ret; |
c9de560d AT |
1241 | } |
1242 | ||
e39e07fd | 1243 | static void ext4_mb_unload_buddy(struct ext4_buddy *e4b) |
c9de560d AT |
1244 | { |
1245 | if (e4b->bd_bitmap_page) | |
1246 | page_cache_release(e4b->bd_bitmap_page); | |
1247 | if (e4b->bd_buddy_page) | |
1248 | page_cache_release(e4b->bd_buddy_page); | |
1249 | } | |
1250 | ||
1251 | ||
1252 | static int mb_find_order_for_block(struct ext4_buddy *e4b, int block) | |
1253 | { | |
1254 | int order = 1; | |
1255 | void *bb; | |
1256 | ||
c5e8f3f3 | 1257 | BUG_ON(e4b->bd_bitmap == e4b->bd_buddy); |
c9de560d AT |
1258 | BUG_ON(block >= (1 << (e4b->bd_blkbits + 3))); |
1259 | ||
c5e8f3f3 | 1260 | bb = e4b->bd_buddy; |
c9de560d AT |
1261 | while (order <= e4b->bd_blkbits + 1) { |
1262 | block = block >> 1; | |
1263 | if (!mb_test_bit(block, bb)) { | |
1264 | /* this block is part of buddy of order 'order' */ | |
1265 | return order; | |
1266 | } | |
1267 | bb += 1 << (e4b->bd_blkbits - order); | |
1268 | order++; | |
1269 | } | |
1270 | return 0; | |
1271 | } | |
1272 | ||
955ce5f5 | 1273 | static void mb_clear_bits(void *bm, int cur, int len) |
c9de560d AT |
1274 | { |
1275 | __u32 *addr; | |
1276 | ||
1277 | len = cur + len; | |
1278 | while (cur < len) { | |
1279 | if ((cur & 31) == 0 && (len - cur) >= 32) { | |
1280 | /* fast path: clear whole word at once */ | |
1281 | addr = bm + (cur >> 3); | |
1282 | *addr = 0; | |
1283 | cur += 32; | |
1284 | continue; | |
1285 | } | |
955ce5f5 | 1286 | mb_clear_bit(cur, bm); |
c9de560d AT |
1287 | cur++; |
1288 | } | |
1289 | } | |
1290 | ||
eabe0444 AS |
1291 | /* clear bits in given range |
1292 | * will return first found zero bit if any, -1 otherwise | |
1293 | */ | |
1294 | static int mb_test_and_clear_bits(void *bm, int cur, int len) | |
1295 | { | |
1296 | __u32 *addr; | |
1297 | int zero_bit = -1; | |
1298 | ||
1299 | len = cur + len; | |
1300 | while (cur < len) { | |
1301 | if ((cur & 31) == 0 && (len - cur) >= 32) { | |
1302 | /* fast path: clear whole word at once */ | |
1303 | addr = bm + (cur >> 3); | |
1304 | if (*addr != (__u32)(-1) && zero_bit == -1) | |
1305 | zero_bit = cur + mb_find_next_zero_bit(addr, 32, 0); | |
1306 | *addr = 0; | |
1307 | cur += 32; | |
1308 | continue; | |
1309 | } | |
1310 | if (!mb_test_and_clear_bit(cur, bm) && zero_bit == -1) | |
1311 | zero_bit = cur; | |
1312 | cur++; | |
1313 | } | |
1314 | ||
1315 | return zero_bit; | |
1316 | } | |
1317 | ||
c3e94d1d | 1318 | void ext4_set_bits(void *bm, int cur, int len) |
c9de560d AT |
1319 | { |
1320 | __u32 *addr; | |
1321 | ||
1322 | len = cur + len; | |
1323 | while (cur < len) { | |
1324 | if ((cur & 31) == 0 && (len - cur) >= 32) { | |
1325 | /* fast path: set whole word at once */ | |
1326 | addr = bm + (cur >> 3); | |
1327 | *addr = 0xffffffff; | |
1328 | cur += 32; | |
1329 | continue; | |
1330 | } | |
955ce5f5 | 1331 | mb_set_bit(cur, bm); |
c9de560d AT |
1332 | cur++; |
1333 | } | |
1334 | } | |
1335 | ||
eabe0444 AS |
1336 | /* |
1337 | * _________________________________________________________________ */ | |
1338 | ||
1339 | static inline int mb_buddy_adjust_border(int* bit, void* bitmap, int side) | |
1340 | { | |
1341 | if (mb_test_bit(*bit + side, bitmap)) { | |
1342 | mb_clear_bit(*bit, bitmap); | |
1343 | (*bit) -= side; | |
1344 | return 1; | |
1345 | } | |
1346 | else { | |
1347 | (*bit) += side; | |
1348 | mb_set_bit(*bit, bitmap); | |
1349 | return -1; | |
1350 | } | |
1351 | } | |
1352 | ||
1353 | static void mb_buddy_mark_free(struct ext4_buddy *e4b, int first, int last) | |
1354 | { | |
1355 | int max; | |
1356 | int order = 1; | |
1357 | void *buddy = mb_find_buddy(e4b, order, &max); | |
1358 | ||
1359 | while (buddy) { | |
1360 | void *buddy2; | |
1361 | ||
1362 | /* Bits in range [first; last] are known to be set since | |
1363 | * corresponding blocks were allocated. Bits in range | |
1364 | * (first; last) will stay set because they form buddies on | |
1365 | * upper layer. We just deal with borders if they don't | |
1366 | * align with upper layer and then go up. | |
1367 | * Releasing entire group is all about clearing | |
1368 | * single bit of highest order buddy. | |
1369 | */ | |
1370 | ||
1371 | /* Example: | |
1372 | * --------------------------------- | |
1373 | * | 1 | 1 | 1 | 1 | | |
1374 | * --------------------------------- | |
1375 | * | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | | |
1376 | * --------------------------------- | |
1377 | * 0 1 2 3 4 5 6 7 | |
1378 | * \_____________________/ | |
1379 | * | |
1380 | * Neither [1] nor [6] is aligned to above layer. | |
1381 | * Left neighbour [0] is free, so mark it busy, | |
1382 | * decrease bb_counters and extend range to | |
1383 | * [0; 6] | |
1384 | * Right neighbour [7] is busy. It can't be coaleasced with [6], so | |
1385 | * mark [6] free, increase bb_counters and shrink range to | |
1386 | * [0; 5]. | |
1387 | * Then shift range to [0; 2], go up and do the same. | |
1388 | */ | |
1389 | ||
1390 | ||
1391 | if (first & 1) | |
1392 | e4b->bd_info->bb_counters[order] += mb_buddy_adjust_border(&first, buddy, -1); | |
1393 | if (!(last & 1)) | |
1394 | e4b->bd_info->bb_counters[order] += mb_buddy_adjust_border(&last, buddy, 1); | |
1395 | if (first > last) | |
1396 | break; | |
1397 | order++; | |
1398 | ||
1399 | if (first == last || !(buddy2 = mb_find_buddy(e4b, order, &max))) { | |
1400 | mb_clear_bits(buddy, first, last - first + 1); | |
1401 | e4b->bd_info->bb_counters[order - 1] += last - first + 1; | |
1402 | break; | |
1403 | } | |
1404 | first >>= 1; | |
1405 | last >>= 1; | |
1406 | buddy = buddy2; | |
1407 | } | |
1408 | } | |
1409 | ||
7e5a8cdd | 1410 | static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b, |
eabe0444 | 1411 | int first, int count) |
c9de560d | 1412 | { |
eabe0444 AS |
1413 | int left_is_free = 0; |
1414 | int right_is_free = 0; | |
1415 | int block; | |
1416 | int last = first + count - 1; | |
c9de560d AT |
1417 | struct super_block *sb = e4b->bd_sb; |
1418 | ||
c99d1e6e TT |
1419 | if (WARN_ON(count == 0)) |
1420 | return; | |
eabe0444 | 1421 | BUG_ON(last >= (sb->s_blocksize << 3)); |
bc8e6740 | 1422 | assert_spin_locked(ext4_group_lock_ptr(sb, e4b->bd_group)); |
163a203d DW |
1423 | /* Don't bother if the block group is corrupt. */ |
1424 | if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info))) | |
1425 | return; | |
1426 | ||
c9de560d AT |
1427 | mb_check_buddy(e4b); |
1428 | mb_free_blocks_double(inode, e4b, first, count); | |
1429 | ||
1430 | e4b->bd_info->bb_free += count; | |
1431 | if (first < e4b->bd_info->bb_first_free) | |
1432 | e4b->bd_info->bb_first_free = first; | |
1433 | ||
eabe0444 AS |
1434 | /* access memory sequentially: check left neighbour, |
1435 | * clear range and then check right neighbour | |
1436 | */ | |
c9de560d | 1437 | if (first != 0) |
eabe0444 AS |
1438 | left_is_free = !mb_test_bit(first - 1, e4b->bd_bitmap); |
1439 | block = mb_test_and_clear_bits(e4b->bd_bitmap, first, count); | |
1440 | if (last + 1 < EXT4_SB(sb)->s_mb_maxs[0]) | |
1441 | right_is_free = !mb_test_bit(last + 1, e4b->bd_bitmap); | |
1442 | ||
1443 | if (unlikely(block != -1)) { | |
e43bb4e6 | 1444 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
eabe0444 AS |
1445 | ext4_fsblk_t blocknr; |
1446 | ||
1447 | blocknr = ext4_group_first_block_no(sb, e4b->bd_group); | |
1448 | blocknr += EXT4_C2B(EXT4_SB(sb), block); | |
1449 | ext4_grp_locked_error(sb, e4b->bd_group, | |
1450 | inode ? inode->i_ino : 0, | |
1451 | blocknr, | |
1452 | "freeing already freed block " | |
163a203d DW |
1453 | "(bit %u); block bitmap corrupt.", |
1454 | block); | |
e43bb4e6 NJ |
1455 | if (!EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info)) |
1456 | percpu_counter_sub(&sbi->s_freeclusters_counter, | |
1457 | e4b->bd_info->bb_free); | |
163a203d DW |
1458 | /* Mark the block group as corrupt. */ |
1459 | set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, | |
1460 | &e4b->bd_info->bb_state); | |
eabe0444 AS |
1461 | mb_regenerate_buddy(e4b); |
1462 | goto done; | |
1463 | } | |
1464 | ||
1465 | /* let's maintain fragments counter */ | |
1466 | if (left_is_free && right_is_free) | |
c9de560d | 1467 | e4b->bd_info->bb_fragments--; |
eabe0444 | 1468 | else if (!left_is_free && !right_is_free) |
c9de560d AT |
1469 | e4b->bd_info->bb_fragments++; |
1470 | ||
eabe0444 AS |
1471 | /* buddy[0] == bd_bitmap is a special case, so handle |
1472 | * it right away and let mb_buddy_mark_free stay free of | |
1473 | * zero order checks. | |
1474 | * Check if neighbours are to be coaleasced, | |
1475 | * adjust bitmap bb_counters and borders appropriately. | |
1476 | */ | |
1477 | if (first & 1) { | |
1478 | first += !left_is_free; | |
1479 | e4b->bd_info->bb_counters[0] += left_is_free ? -1 : 1; | |
1480 | } | |
1481 | if (!(last & 1)) { | |
1482 | last -= !right_is_free; | |
1483 | e4b->bd_info->bb_counters[0] += right_is_free ? -1 : 1; | |
1484 | } | |
c9de560d | 1485 | |
eabe0444 AS |
1486 | if (first <= last) |
1487 | mb_buddy_mark_free(e4b, first >> 1, last >> 1); | |
c9de560d | 1488 | |
eabe0444 | 1489 | done: |
8a57d9d6 | 1490 | mb_set_largest_free_order(sb, e4b->bd_info); |
c9de560d | 1491 | mb_check_buddy(e4b); |
c9de560d AT |
1492 | } |
1493 | ||
15c006a2 | 1494 | static int mb_find_extent(struct ext4_buddy *e4b, int block, |
c9de560d AT |
1495 | int needed, struct ext4_free_extent *ex) |
1496 | { | |
1497 | int next = block; | |
15c006a2 | 1498 | int max, order; |
c9de560d AT |
1499 | void *buddy; |
1500 | ||
bc8e6740 | 1501 | assert_spin_locked(ext4_group_lock_ptr(e4b->bd_sb, e4b->bd_group)); |
c9de560d AT |
1502 | BUG_ON(ex == NULL); |
1503 | ||
15c006a2 | 1504 | buddy = mb_find_buddy(e4b, 0, &max); |
c9de560d AT |
1505 | BUG_ON(buddy == NULL); |
1506 | BUG_ON(block >= max); | |
1507 | if (mb_test_bit(block, buddy)) { | |
1508 | ex->fe_len = 0; | |
1509 | ex->fe_start = 0; | |
1510 | ex->fe_group = 0; | |
1511 | return 0; | |
1512 | } | |
1513 | ||
15c006a2 RD |
1514 | /* find actual order */ |
1515 | order = mb_find_order_for_block(e4b, block); | |
1516 | block = block >> order; | |
c9de560d AT |
1517 | |
1518 | ex->fe_len = 1 << order; | |
1519 | ex->fe_start = block << order; | |
1520 | ex->fe_group = e4b->bd_group; | |
1521 | ||
1522 | /* calc difference from given start */ | |
1523 | next = next - ex->fe_start; | |
1524 | ex->fe_len -= next; | |
1525 | ex->fe_start += next; | |
1526 | ||
1527 | while (needed > ex->fe_len && | |
d8ec0c39 | 1528 | mb_find_buddy(e4b, order, &max)) { |
c9de560d AT |
1529 | |
1530 | if (block + 1 >= max) | |
1531 | break; | |
1532 | ||
1533 | next = (block + 1) * (1 << order); | |
c5e8f3f3 | 1534 | if (mb_test_bit(next, e4b->bd_bitmap)) |
c9de560d AT |
1535 | break; |
1536 | ||
b051d8dc | 1537 | order = mb_find_order_for_block(e4b, next); |
c9de560d | 1538 | |
c9de560d AT |
1539 | block = next >> order; |
1540 | ex->fe_len += 1 << order; | |
1541 | } | |
1542 | ||
1543 | BUG_ON(ex->fe_start + ex->fe_len > (1 << (e4b->bd_blkbits + 3))); | |
1544 | return ex->fe_len; | |
1545 | } | |
1546 | ||
1547 | static int mb_mark_used(struct ext4_buddy *e4b, struct ext4_free_extent *ex) | |
1548 | { | |
1549 | int ord; | |
1550 | int mlen = 0; | |
1551 | int max = 0; | |
1552 | int cur; | |
1553 | int start = ex->fe_start; | |
1554 | int len = ex->fe_len; | |
1555 | unsigned ret = 0; | |
1556 | int len0 = len; | |
1557 | void *buddy; | |
1558 | ||
1559 | BUG_ON(start + len > (e4b->bd_sb->s_blocksize << 3)); | |
1560 | BUG_ON(e4b->bd_group != ex->fe_group); | |
bc8e6740 | 1561 | assert_spin_locked(ext4_group_lock_ptr(e4b->bd_sb, e4b->bd_group)); |
c9de560d AT |
1562 | mb_check_buddy(e4b); |
1563 | mb_mark_used_double(e4b, start, len); | |
1564 | ||
1565 | e4b->bd_info->bb_free -= len; | |
1566 | if (e4b->bd_info->bb_first_free == start) | |
1567 | e4b->bd_info->bb_first_free += len; | |
1568 | ||
1569 | /* let's maintain fragments counter */ | |
1570 | if (start != 0) | |
c5e8f3f3 | 1571 | mlen = !mb_test_bit(start - 1, e4b->bd_bitmap); |
c9de560d | 1572 | if (start + len < EXT4_SB(e4b->bd_sb)->s_mb_maxs[0]) |
c5e8f3f3 | 1573 | max = !mb_test_bit(start + len, e4b->bd_bitmap); |
c9de560d AT |
1574 | if (mlen && max) |
1575 | e4b->bd_info->bb_fragments++; | |
1576 | else if (!mlen && !max) | |
1577 | e4b->bd_info->bb_fragments--; | |
1578 | ||
1579 | /* let's maintain buddy itself */ | |
1580 | while (len) { | |
1581 | ord = mb_find_order_for_block(e4b, start); | |
1582 | ||
1583 | if (((start >> ord) << ord) == start && len >= (1 << ord)) { | |
1584 | /* the whole chunk may be allocated at once! */ | |
1585 | mlen = 1 << ord; | |
1586 | buddy = mb_find_buddy(e4b, ord, &max); | |
1587 | BUG_ON((start >> ord) >= max); | |
1588 | mb_set_bit(start >> ord, buddy); | |
1589 | e4b->bd_info->bb_counters[ord]--; | |
1590 | start += mlen; | |
1591 | len -= mlen; | |
1592 | BUG_ON(len < 0); | |
1593 | continue; | |
1594 | } | |
1595 | ||
1596 | /* store for history */ | |
1597 | if (ret == 0) | |
1598 | ret = len | (ord << 16); | |
1599 | ||
1600 | /* we have to split large buddy */ | |
1601 | BUG_ON(ord <= 0); | |
1602 | buddy = mb_find_buddy(e4b, ord, &max); | |
1603 | mb_set_bit(start >> ord, buddy); | |
1604 | e4b->bd_info->bb_counters[ord]--; | |
1605 | ||
1606 | ord--; | |
1607 | cur = (start >> ord) & ~1U; | |
1608 | buddy = mb_find_buddy(e4b, ord, &max); | |
1609 | mb_clear_bit(cur, buddy); | |
1610 | mb_clear_bit(cur + 1, buddy); | |
1611 | e4b->bd_info->bb_counters[ord]++; | |
1612 | e4b->bd_info->bb_counters[ord]++; | |
1613 | } | |
8a57d9d6 | 1614 | mb_set_largest_free_order(e4b->bd_sb, e4b->bd_info); |
c9de560d | 1615 | |
c5e8f3f3 | 1616 | ext4_set_bits(e4b->bd_bitmap, ex->fe_start, len0); |
c9de560d AT |
1617 | mb_check_buddy(e4b); |
1618 | ||
1619 | return ret; | |
1620 | } | |
1621 | ||
1622 | /* | |
1623 | * Must be called under group lock! | |
1624 | */ | |
1625 | static void ext4_mb_use_best_found(struct ext4_allocation_context *ac, | |
1626 | struct ext4_buddy *e4b) | |
1627 | { | |
1628 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); | |
1629 | int ret; | |
1630 | ||
1631 | BUG_ON(ac->ac_b_ex.fe_group != e4b->bd_group); | |
1632 | BUG_ON(ac->ac_status == AC_STATUS_FOUND); | |
1633 | ||
1634 | ac->ac_b_ex.fe_len = min(ac->ac_b_ex.fe_len, ac->ac_g_ex.fe_len); | |
1635 | ac->ac_b_ex.fe_logical = ac->ac_g_ex.fe_logical; | |
1636 | ret = mb_mark_used(e4b, &ac->ac_b_ex); | |
1637 | ||
1638 | /* preallocation can change ac_b_ex, thus we store actually | |
1639 | * allocated blocks for history */ | |
1640 | ac->ac_f_ex = ac->ac_b_ex; | |
1641 | ||
1642 | ac->ac_status = AC_STATUS_FOUND; | |
1643 | ac->ac_tail = ret & 0xffff; | |
1644 | ac->ac_buddy = ret >> 16; | |
1645 | ||
c3a326a6 AK |
1646 | /* |
1647 | * take the page reference. We want the page to be pinned | |
1648 | * so that we don't get a ext4_mb_init_cache_call for this | |
1649 | * group until we update the bitmap. That would mean we | |
1650 | * double allocate blocks. The reference is dropped | |
1651 | * in ext4_mb_release_context | |
1652 | */ | |
c9de560d AT |
1653 | ac->ac_bitmap_page = e4b->bd_bitmap_page; |
1654 | get_page(ac->ac_bitmap_page); | |
1655 | ac->ac_buddy_page = e4b->bd_buddy_page; | |
1656 | get_page(ac->ac_buddy_page); | |
c9de560d | 1657 | /* store last allocated for subsequent stream allocation */ |
4ba74d00 | 1658 | if (ac->ac_flags & EXT4_MB_STREAM_ALLOC) { |
c9de560d AT |
1659 | spin_lock(&sbi->s_md_lock); |
1660 | sbi->s_mb_last_group = ac->ac_f_ex.fe_group; | |
1661 | sbi->s_mb_last_start = ac->ac_f_ex.fe_start; | |
1662 | spin_unlock(&sbi->s_md_lock); | |
1663 | } | |
1664 | } | |
1665 | ||
1666 | /* | |
1667 | * regular allocator, for general purposes allocation | |
1668 | */ | |
1669 | ||
1670 | static void ext4_mb_check_limits(struct ext4_allocation_context *ac, | |
1671 | struct ext4_buddy *e4b, | |
1672 | int finish_group) | |
1673 | { | |
1674 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); | |
1675 | struct ext4_free_extent *bex = &ac->ac_b_ex; | |
1676 | struct ext4_free_extent *gex = &ac->ac_g_ex; | |
1677 | struct ext4_free_extent ex; | |
1678 | int max; | |
1679 | ||
032115fc AK |
1680 | if (ac->ac_status == AC_STATUS_FOUND) |
1681 | return; | |
c9de560d AT |
1682 | /* |
1683 | * We don't want to scan for a whole year | |
1684 | */ | |
1685 | if (ac->ac_found > sbi->s_mb_max_to_scan && | |
1686 | !(ac->ac_flags & EXT4_MB_HINT_FIRST)) { | |
1687 | ac->ac_status = AC_STATUS_BREAK; | |
1688 | return; | |
1689 | } | |
1690 | ||
1691 | /* | |
1692 | * Haven't found good chunk so far, let's continue | |
1693 | */ | |
1694 | if (bex->fe_len < gex->fe_len) | |
1695 | return; | |
1696 | ||
1697 | if ((finish_group || ac->ac_found > sbi->s_mb_min_to_scan) | |
1698 | && bex->fe_group == e4b->bd_group) { | |
1699 | /* recheck chunk's availability - we don't know | |
1700 | * when it was found (within this lock-unlock | |
1701 | * period or not) */ | |
15c006a2 | 1702 | max = mb_find_extent(e4b, bex->fe_start, gex->fe_len, &ex); |
c9de560d AT |
1703 | if (max >= gex->fe_len) { |
1704 | ext4_mb_use_best_found(ac, e4b); | |
1705 | return; | |
1706 | } | |
1707 | } | |
1708 | } | |
1709 | ||
1710 | /* | |
1711 | * The routine checks whether found extent is good enough. If it is, | |
1712 | * then the extent gets marked used and flag is set to the context | |
1713 | * to stop scanning. Otherwise, the extent is compared with the | |
1714 | * previous found extent and if new one is better, then it's stored | |
1715 | * in the context. Later, the best found extent will be used, if | |
1716 | * mballoc can't find good enough extent. | |
1717 | * | |
1718 | * FIXME: real allocation policy is to be designed yet! | |
1719 | */ | |
1720 | static void ext4_mb_measure_extent(struct ext4_allocation_context *ac, | |
1721 | struct ext4_free_extent *ex, | |
1722 | struct ext4_buddy *e4b) | |
1723 | { | |
1724 | struct ext4_free_extent *bex = &ac->ac_b_ex; | |
1725 | struct ext4_free_extent *gex = &ac->ac_g_ex; | |
1726 | ||
1727 | BUG_ON(ex->fe_len <= 0); | |
7137d7a4 TT |
1728 | BUG_ON(ex->fe_len > EXT4_CLUSTERS_PER_GROUP(ac->ac_sb)); |
1729 | BUG_ON(ex->fe_start >= EXT4_CLUSTERS_PER_GROUP(ac->ac_sb)); | |
c9de560d AT |
1730 | BUG_ON(ac->ac_status != AC_STATUS_CONTINUE); |
1731 | ||
1732 | ac->ac_found++; | |
1733 | ||
1734 | /* | |
1735 | * The special case - take what you catch first | |
1736 | */ | |
1737 | if (unlikely(ac->ac_flags & EXT4_MB_HINT_FIRST)) { | |
1738 | *bex = *ex; | |
1739 | ext4_mb_use_best_found(ac, e4b); | |
1740 | return; | |
1741 | } | |
1742 | ||
1743 | /* | |
1744 | * Let's check whether the chuck is good enough | |
1745 | */ | |
1746 | if (ex->fe_len == gex->fe_len) { | |
1747 | *bex = *ex; | |
1748 | ext4_mb_use_best_found(ac, e4b); | |
1749 | return; | |
1750 | } | |
1751 | ||
1752 | /* | |
1753 | * If this is first found extent, just store it in the context | |
1754 | */ | |
1755 | if (bex->fe_len == 0) { | |
1756 | *bex = *ex; | |
1757 | return; | |
1758 | } | |
1759 | ||
1760 | /* | |
1761 | * If new found extent is better, store it in the context | |
1762 | */ | |
1763 | if (bex->fe_len < gex->fe_len) { | |
1764 | /* if the request isn't satisfied, any found extent | |
1765 | * larger than previous best one is better */ | |
1766 | if (ex->fe_len > bex->fe_len) | |
1767 | *bex = *ex; | |
1768 | } else if (ex->fe_len > gex->fe_len) { | |
1769 | /* if the request is satisfied, then we try to find | |
1770 | * an extent that still satisfy the request, but is | |
1771 | * smaller than previous one */ | |
1772 | if (ex->fe_len < bex->fe_len) | |
1773 | *bex = *ex; | |
1774 | } | |
1775 | ||
1776 | ext4_mb_check_limits(ac, e4b, 0); | |
1777 | } | |
1778 | ||
089ceecc ES |
1779 | static noinline_for_stack |
1780 | int ext4_mb_try_best_found(struct ext4_allocation_context *ac, | |
c9de560d AT |
1781 | struct ext4_buddy *e4b) |
1782 | { | |
1783 | struct ext4_free_extent ex = ac->ac_b_ex; | |
1784 | ext4_group_t group = ex.fe_group; | |
1785 | int max; | |
1786 | int err; | |
1787 | ||
1788 | BUG_ON(ex.fe_len <= 0); | |
1789 | err = ext4_mb_load_buddy(ac->ac_sb, group, e4b); | |
1790 | if (err) | |
1791 | return err; | |
1792 | ||
1793 | ext4_lock_group(ac->ac_sb, group); | |
15c006a2 | 1794 | max = mb_find_extent(e4b, ex.fe_start, ex.fe_len, &ex); |
c9de560d AT |
1795 | |
1796 | if (max > 0) { | |
1797 | ac->ac_b_ex = ex; | |
1798 | ext4_mb_use_best_found(ac, e4b); | |
1799 | } | |
1800 | ||
1801 | ext4_unlock_group(ac->ac_sb, group); | |
e39e07fd | 1802 | ext4_mb_unload_buddy(e4b); |
c9de560d AT |
1803 | |
1804 | return 0; | |
1805 | } | |
1806 | ||
089ceecc ES |
1807 | static noinline_for_stack |
1808 | int ext4_mb_find_by_goal(struct ext4_allocation_context *ac, | |
c9de560d AT |
1809 | struct ext4_buddy *e4b) |
1810 | { | |
1811 | ext4_group_t group = ac->ac_g_ex.fe_group; | |
1812 | int max; | |
1813 | int err; | |
1814 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); | |
838cd0cf | 1815 | struct ext4_group_info *grp = ext4_get_group_info(ac->ac_sb, group); |
c9de560d AT |
1816 | struct ext4_free_extent ex; |
1817 | ||
1818 | if (!(ac->ac_flags & EXT4_MB_HINT_TRY_GOAL)) | |
1819 | return 0; | |
838cd0cf YY |
1820 | if (grp->bb_free == 0) |
1821 | return 0; | |
c9de560d AT |
1822 | |
1823 | err = ext4_mb_load_buddy(ac->ac_sb, group, e4b); | |
1824 | if (err) | |
1825 | return err; | |
1826 | ||
163a203d DW |
1827 | if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info))) { |
1828 | ext4_mb_unload_buddy(e4b); | |
1829 | return 0; | |
1830 | } | |
1831 | ||
c9de560d | 1832 | ext4_lock_group(ac->ac_sb, group); |
15c006a2 | 1833 | max = mb_find_extent(e4b, ac->ac_g_ex.fe_start, |
c9de560d | 1834 | ac->ac_g_ex.fe_len, &ex); |
ab0c00fc | 1835 | ex.fe_logical = 0xDEADFA11; /* debug value */ |
c9de560d AT |
1836 | |
1837 | if (max >= ac->ac_g_ex.fe_len && ac->ac_g_ex.fe_len == sbi->s_stripe) { | |
1838 | ext4_fsblk_t start; | |
1839 | ||
5661bd68 AM |
1840 | start = ext4_group_first_block_no(ac->ac_sb, e4b->bd_group) + |
1841 | ex.fe_start; | |
c9de560d AT |
1842 | /* use do_div to get remainder (would be 64-bit modulo) */ |
1843 | if (do_div(start, sbi->s_stripe) == 0) { | |
1844 | ac->ac_found++; | |
1845 | ac->ac_b_ex = ex; | |
1846 | ext4_mb_use_best_found(ac, e4b); | |
1847 | } | |
1848 | } else if (max >= ac->ac_g_ex.fe_len) { | |
1849 | BUG_ON(ex.fe_len <= 0); | |
1850 | BUG_ON(ex.fe_group != ac->ac_g_ex.fe_group); | |
1851 | BUG_ON(ex.fe_start != ac->ac_g_ex.fe_start); | |
1852 | ac->ac_found++; | |
1853 | ac->ac_b_ex = ex; | |
1854 | ext4_mb_use_best_found(ac, e4b); | |
1855 | } else if (max > 0 && (ac->ac_flags & EXT4_MB_HINT_MERGE)) { | |
1856 | /* Sometimes, caller may want to merge even small | |
1857 | * number of blocks to an existing extent */ | |
1858 | BUG_ON(ex.fe_len <= 0); | |
1859 | BUG_ON(ex.fe_group != ac->ac_g_ex.fe_group); | |
1860 | BUG_ON(ex.fe_start != ac->ac_g_ex.fe_start); | |
1861 | ac->ac_found++; | |
1862 | ac->ac_b_ex = ex; | |
1863 | ext4_mb_use_best_found(ac, e4b); | |
1864 | } | |
1865 | ext4_unlock_group(ac->ac_sb, group); | |
e39e07fd | 1866 | ext4_mb_unload_buddy(e4b); |
c9de560d AT |
1867 | |
1868 | return 0; | |
1869 | } | |
1870 | ||
1871 | /* | |
1872 | * The routine scans buddy structures (not bitmap!) from given order | |
1873 | * to max order and tries to find big enough chunk to satisfy the req | |
1874 | */ | |
089ceecc ES |
1875 | static noinline_for_stack |
1876 | void ext4_mb_simple_scan_group(struct ext4_allocation_context *ac, | |
c9de560d AT |
1877 | struct ext4_buddy *e4b) |
1878 | { | |
1879 | struct super_block *sb = ac->ac_sb; | |
1880 | struct ext4_group_info *grp = e4b->bd_info; | |
1881 | void *buddy; | |
1882 | int i; | |
1883 | int k; | |
1884 | int max; | |
1885 | ||
1886 | BUG_ON(ac->ac_2order <= 0); | |
1887 | for (i = ac->ac_2order; i <= sb->s_blocksize_bits + 1; i++) { | |
1888 | if (grp->bb_counters[i] == 0) | |
1889 | continue; | |
1890 | ||
1891 | buddy = mb_find_buddy(e4b, i, &max); | |
1892 | BUG_ON(buddy == NULL); | |
1893 | ||
ffad0a44 | 1894 | k = mb_find_next_zero_bit(buddy, max, 0); |
c9de560d AT |
1895 | BUG_ON(k >= max); |
1896 | ||
1897 | ac->ac_found++; | |
1898 | ||
1899 | ac->ac_b_ex.fe_len = 1 << i; | |
1900 | ac->ac_b_ex.fe_start = k << i; | |
1901 | ac->ac_b_ex.fe_group = e4b->bd_group; | |
1902 | ||
1903 | ext4_mb_use_best_found(ac, e4b); | |
1904 | ||
1905 | BUG_ON(ac->ac_b_ex.fe_len != ac->ac_g_ex.fe_len); | |
1906 | ||
1907 | if (EXT4_SB(sb)->s_mb_stats) | |
1908 | atomic_inc(&EXT4_SB(sb)->s_bal_2orders); | |
1909 | ||
1910 | break; | |
1911 | } | |
1912 | } | |
1913 | ||
1914 | /* | |
1915 | * The routine scans the group and measures all found extents. | |
1916 | * In order to optimize scanning, caller must pass number of | |
1917 | * free blocks in the group, so the routine can know upper limit. | |
1918 | */ | |
089ceecc ES |
1919 | static noinline_for_stack |
1920 | void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac, | |
c9de560d AT |
1921 | struct ext4_buddy *e4b) |
1922 | { | |
1923 | struct super_block *sb = ac->ac_sb; | |
c5e8f3f3 | 1924 | void *bitmap = e4b->bd_bitmap; |
c9de560d AT |
1925 | struct ext4_free_extent ex; |
1926 | int i; | |
1927 | int free; | |
1928 | ||
1929 | free = e4b->bd_info->bb_free; | |
1930 | BUG_ON(free <= 0); | |
1931 | ||
1932 | i = e4b->bd_info->bb_first_free; | |
1933 | ||
1934 | while (free && ac->ac_status == AC_STATUS_CONTINUE) { | |
ffad0a44 | 1935 | i = mb_find_next_zero_bit(bitmap, |
7137d7a4 TT |
1936 | EXT4_CLUSTERS_PER_GROUP(sb), i); |
1937 | if (i >= EXT4_CLUSTERS_PER_GROUP(sb)) { | |
26346ff6 | 1938 | /* |
e56eb659 | 1939 | * IF we have corrupt bitmap, we won't find any |
26346ff6 AK |
1940 | * free blocks even though group info says we |
1941 | * we have free blocks | |
1942 | */ | |
e29136f8 | 1943 | ext4_grp_locked_error(sb, e4b->bd_group, 0, 0, |
53accfa9 | 1944 | "%d free clusters as per " |
fde4d95a | 1945 | "group info. But bitmap says 0", |
26346ff6 | 1946 | free); |
c9de560d AT |
1947 | break; |
1948 | } | |
1949 | ||
15c006a2 | 1950 | mb_find_extent(e4b, i, ac->ac_g_ex.fe_len, &ex); |
c9de560d | 1951 | BUG_ON(ex.fe_len <= 0); |
26346ff6 | 1952 | if (free < ex.fe_len) { |
e29136f8 | 1953 | ext4_grp_locked_error(sb, e4b->bd_group, 0, 0, |
53accfa9 | 1954 | "%d free clusters as per " |
fde4d95a | 1955 | "group info. But got %d blocks", |
26346ff6 | 1956 | free, ex.fe_len); |
e56eb659 AK |
1957 | /* |
1958 | * The number of free blocks differs. This mostly | |
1959 | * indicate that the bitmap is corrupt. So exit | |
1960 | * without claiming the space. | |
1961 | */ | |
1962 | break; | |
26346ff6 | 1963 | } |
ab0c00fc | 1964 | ex.fe_logical = 0xDEADC0DE; /* debug value */ |
c9de560d AT |
1965 | ext4_mb_measure_extent(ac, &ex, e4b); |
1966 | ||
1967 | i += ex.fe_len; | |
1968 | free -= ex.fe_len; | |
1969 | } | |
1970 | ||
1971 | ext4_mb_check_limits(ac, e4b, 1); | |
1972 | } | |
1973 | ||
1974 | /* | |
1975 | * This is a special case for storages like raid5 | |
506bf2d8 | 1976 | * we try to find stripe-aligned chunks for stripe-size-multiple requests |
c9de560d | 1977 | */ |
089ceecc ES |
1978 | static noinline_for_stack |
1979 | void ext4_mb_scan_aligned(struct ext4_allocation_context *ac, | |
c9de560d AT |
1980 | struct ext4_buddy *e4b) |
1981 | { | |
1982 | struct super_block *sb = ac->ac_sb; | |
1983 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
c5e8f3f3 | 1984 | void *bitmap = e4b->bd_bitmap; |
c9de560d AT |
1985 | struct ext4_free_extent ex; |
1986 | ext4_fsblk_t first_group_block; | |
1987 | ext4_fsblk_t a; | |
1988 | ext4_grpblk_t i; | |
1989 | int max; | |
1990 | ||
1991 | BUG_ON(sbi->s_stripe == 0); | |
1992 | ||
1993 | /* find first stripe-aligned block in group */ | |
5661bd68 AM |
1994 | first_group_block = ext4_group_first_block_no(sb, e4b->bd_group); |
1995 | ||
c9de560d AT |
1996 | a = first_group_block + sbi->s_stripe - 1; |
1997 | do_div(a, sbi->s_stripe); | |
1998 | i = (a * sbi->s_stripe) - first_group_block; | |
1999 | ||
7137d7a4 | 2000 | while (i < EXT4_CLUSTERS_PER_GROUP(sb)) { |
c9de560d | 2001 | if (!mb_test_bit(i, bitmap)) { |
15c006a2 | 2002 | max = mb_find_extent(e4b, i, sbi->s_stripe, &ex); |
c9de560d AT |
2003 | if (max >= sbi->s_stripe) { |
2004 | ac->ac_found++; | |
ab0c00fc | 2005 | ex.fe_logical = 0xDEADF00D; /* debug value */ |
c9de560d AT |
2006 | ac->ac_b_ex = ex; |
2007 | ext4_mb_use_best_found(ac, e4b); | |
2008 | break; | |
2009 | } | |
2010 | } | |
2011 | i += sbi->s_stripe; | |
2012 | } | |
2013 | } | |
2014 | ||
42ac1848 LC |
2015 | /* |
2016 | * This is now called BEFORE we load the buddy bitmap. | |
2017 | * Returns either 1 or 0 indicating that the group is either suitable | |
2018 | * for the allocation or not. In addition it can also return negative | |
2019 | * error code when something goes wrong. | |
2020 | */ | |
c9de560d AT |
2021 | static int ext4_mb_good_group(struct ext4_allocation_context *ac, |
2022 | ext4_group_t group, int cr) | |
2023 | { | |
2024 | unsigned free, fragments; | |
a4912123 | 2025 | int flex_size = ext4_flex_bg_size(EXT4_SB(ac->ac_sb)); |
c9de560d AT |
2026 | struct ext4_group_info *grp = ext4_get_group_info(ac->ac_sb, group); |
2027 | ||
2028 | BUG_ON(cr < 0 || cr >= 4); | |
8a57d9d6 | 2029 | |
01fc48e8 TT |
2030 | free = grp->bb_free; |
2031 | if (free == 0) | |
2032 | return 0; | |
2033 | if (cr <= 2 && free < ac->ac_g_ex.fe_len) | |
2034 | return 0; | |
2035 | ||
163a203d DW |
2036 | if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(grp))) |
2037 | return 0; | |
2038 | ||
8a57d9d6 CW |
2039 | /* We only do this if the grp has never been initialized */ |
2040 | if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) { | |
2041 | int ret = ext4_mb_init_group(ac->ac_sb, group); | |
2042 | if (ret) | |
42ac1848 | 2043 | return ret; |
8a57d9d6 | 2044 | } |
c9de560d | 2045 | |
c9de560d | 2046 | fragments = grp->bb_fragments; |
c9de560d AT |
2047 | if (fragments == 0) |
2048 | return 0; | |
2049 | ||
2050 | switch (cr) { | |
2051 | case 0: | |
2052 | BUG_ON(ac->ac_2order == 0); | |
c9de560d | 2053 | |
a4912123 TT |
2054 | /* Avoid using the first bg of a flexgroup for data files */ |
2055 | if ((ac->ac_flags & EXT4_MB_HINT_DATA) && | |
2056 | (flex_size >= EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME) && | |
2057 | ((group % flex_size) == 0)) | |
2058 | return 0; | |
2059 | ||
40ae3487 TT |
2060 | if ((ac->ac_2order > ac->ac_sb->s_blocksize_bits+1) || |
2061 | (free / fragments) >= ac->ac_g_ex.fe_len) | |
2062 | return 1; | |
2063 | ||
2064 | if (grp->bb_largest_free_order < ac->ac_2order) | |
2065 | return 0; | |
2066 | ||
8a57d9d6 | 2067 | return 1; |
c9de560d AT |
2068 | case 1: |
2069 | if ((free / fragments) >= ac->ac_g_ex.fe_len) | |
2070 | return 1; | |
2071 | break; | |
2072 | case 2: | |
2073 | if (free >= ac->ac_g_ex.fe_len) | |
2074 | return 1; | |
2075 | break; | |
2076 | case 3: | |
2077 | return 1; | |
2078 | default: | |
2079 | BUG(); | |
2080 | } | |
2081 | ||
2082 | return 0; | |
2083 | } | |
2084 | ||
4ddfef7b ES |
2085 | static noinline_for_stack int |
2086 | ext4_mb_regular_allocator(struct ext4_allocation_context *ac) | |
c9de560d | 2087 | { |
8df9675f | 2088 | ext4_group_t ngroups, group, i; |
c9de560d | 2089 | int cr; |
42ac1848 | 2090 | int err = 0, first_err = 0; |
c9de560d AT |
2091 | struct ext4_sb_info *sbi; |
2092 | struct super_block *sb; | |
2093 | struct ext4_buddy e4b; | |
c9de560d AT |
2094 | |
2095 | sb = ac->ac_sb; | |
2096 | sbi = EXT4_SB(sb); | |
8df9675f | 2097 | ngroups = ext4_get_groups_count(sb); |
fb0a387d | 2098 | /* non-extent files are limited to low blocks/groups */ |
12e9b892 | 2099 | if (!(ext4_test_inode_flag(ac->ac_inode, EXT4_INODE_EXTENTS))) |
fb0a387d ES |
2100 | ngroups = sbi->s_blockfile_groups; |
2101 | ||
c9de560d AT |
2102 | BUG_ON(ac->ac_status == AC_STATUS_FOUND); |
2103 | ||
2104 | /* first, try the goal */ | |
2105 | err = ext4_mb_find_by_goal(ac, &e4b); | |
2106 | if (err || ac->ac_status == AC_STATUS_FOUND) | |
2107 | goto out; | |
2108 | ||
2109 | if (unlikely(ac->ac_flags & EXT4_MB_HINT_GOAL_ONLY)) | |
2110 | goto out; | |
2111 | ||
2112 | /* | |
2113 | * ac->ac2_order is set only if the fe_len is a power of 2 | |
2114 | * if ac2_order is set we also set criteria to 0 so that we | |
2115 | * try exact allocation using buddy. | |
2116 | */ | |
2117 | i = fls(ac->ac_g_ex.fe_len); | |
2118 | ac->ac_2order = 0; | |
2119 | /* | |
2120 | * We search using buddy data only if the order of the request | |
2121 | * is greater than equal to the sbi_s_mb_order2_reqs | |
b713a5ec | 2122 | * You can tune it via /sys/fs/ext4/<partition>/mb_order2_req |
c9de560d AT |
2123 | */ |
2124 | if (i >= sbi->s_mb_order2_reqs) { | |
2125 | /* | |
2126 | * This should tell if fe_len is exactly power of 2 | |
2127 | */ | |
2128 | if ((ac->ac_g_ex.fe_len & (~(1 << (i - 1)))) == 0) | |
2129 | ac->ac_2order = i - 1; | |
2130 | } | |
2131 | ||
4ba74d00 TT |
2132 | /* if stream allocation is enabled, use global goal */ |
2133 | if (ac->ac_flags & EXT4_MB_STREAM_ALLOC) { | |
c9de560d AT |
2134 | /* TBD: may be hot point */ |
2135 | spin_lock(&sbi->s_md_lock); | |
2136 | ac->ac_g_ex.fe_group = sbi->s_mb_last_group; | |
2137 | ac->ac_g_ex.fe_start = sbi->s_mb_last_start; | |
2138 | spin_unlock(&sbi->s_md_lock); | |
2139 | } | |
4ba74d00 | 2140 | |
c9de560d AT |
2141 | /* Let's just scan groups to find more-less suitable blocks */ |
2142 | cr = ac->ac_2order ? 0 : 1; | |
2143 | /* | |
2144 | * cr == 0 try to get exact allocation, | |
2145 | * cr == 3 try to get anything | |
2146 | */ | |
2147 | repeat: | |
2148 | for (; cr < 4 && ac->ac_status == AC_STATUS_CONTINUE; cr++) { | |
2149 | ac->ac_criteria = cr; | |
ed8f9c75 AK |
2150 | /* |
2151 | * searching for the right group start | |
2152 | * from the goal value specified | |
2153 | */ | |
2154 | group = ac->ac_g_ex.fe_group; | |
2155 | ||
8df9675f | 2156 | for (i = 0; i < ngroups; group++, i++) { |
42ac1848 | 2157 | int ret = 0; |
2ed5724d | 2158 | cond_resched(); |
e6155736 LM |
2159 | /* |
2160 | * Artificially restricted ngroups for non-extent | |
2161 | * files makes group > ngroups possible on first loop. | |
2162 | */ | |
2163 | if (group >= ngroups) | |
c9de560d AT |
2164 | group = 0; |
2165 | ||
8a57d9d6 | 2166 | /* This now checks without needing the buddy page */ |
42ac1848 LC |
2167 | ret = ext4_mb_good_group(ac, group, cr); |
2168 | if (ret <= 0) { | |
2169 | if (!first_err) | |
2170 | first_err = ret; | |
c9de560d | 2171 | continue; |
42ac1848 | 2172 | } |
c9de560d | 2173 | |
c9de560d AT |
2174 | err = ext4_mb_load_buddy(sb, group, &e4b); |
2175 | if (err) | |
2176 | goto out; | |
2177 | ||
2178 | ext4_lock_group(sb, group); | |
8a57d9d6 CW |
2179 | |
2180 | /* | |
2181 | * We need to check again after locking the | |
2182 | * block group | |
2183 | */ | |
42ac1848 LC |
2184 | ret = ext4_mb_good_group(ac, group, cr); |
2185 | if (ret <= 0) { | |
c9de560d | 2186 | ext4_unlock_group(sb, group); |
e39e07fd | 2187 | ext4_mb_unload_buddy(&e4b); |
42ac1848 LC |
2188 | if (!first_err) |
2189 | first_err = ret; | |
c9de560d AT |
2190 | continue; |
2191 | } | |
2192 | ||
2193 | ac->ac_groups_scanned++; | |
40ae3487 | 2194 | if (cr == 0 && ac->ac_2order < sb->s_blocksize_bits+2) |
c9de560d | 2195 | ext4_mb_simple_scan_group(ac, &e4b); |
506bf2d8 ES |
2196 | else if (cr == 1 && sbi->s_stripe && |
2197 | !(ac->ac_g_ex.fe_len % sbi->s_stripe)) | |
c9de560d AT |
2198 | ext4_mb_scan_aligned(ac, &e4b); |
2199 | else | |
2200 | ext4_mb_complex_scan_group(ac, &e4b); | |
2201 | ||
2202 | ext4_unlock_group(sb, group); | |
e39e07fd | 2203 | ext4_mb_unload_buddy(&e4b); |
c9de560d AT |
2204 | |
2205 | if (ac->ac_status != AC_STATUS_CONTINUE) | |
2206 | break; | |
2207 | } | |
2208 | } | |
2209 | ||
2210 | if (ac->ac_b_ex.fe_len > 0 && ac->ac_status != AC_STATUS_FOUND && | |
2211 | !(ac->ac_flags & EXT4_MB_HINT_FIRST)) { | |
2212 | /* | |
2213 | * We've been searching too long. Let's try to allocate | |
2214 | * the best chunk we've found so far | |
2215 | */ | |
2216 | ||
2217 | ext4_mb_try_best_found(ac, &e4b); | |
2218 | if (ac->ac_status != AC_STATUS_FOUND) { | |
2219 | /* | |
2220 | * Someone more lucky has already allocated it. | |
2221 | * The only thing we can do is just take first | |
2222 | * found block(s) | |
2223 | printk(KERN_DEBUG "EXT4-fs: someone won our chunk\n"); | |
2224 | */ | |
2225 | ac->ac_b_ex.fe_group = 0; | |
2226 | ac->ac_b_ex.fe_start = 0; | |
2227 | ac->ac_b_ex.fe_len = 0; | |
2228 | ac->ac_status = AC_STATUS_CONTINUE; | |
2229 | ac->ac_flags |= EXT4_MB_HINT_FIRST; | |
2230 | cr = 3; | |
2231 | atomic_inc(&sbi->s_mb_lost_chunks); | |
2232 | goto repeat; | |
2233 | } | |
2234 | } | |
2235 | out: | |
42ac1848 LC |
2236 | if (!err && ac->ac_status != AC_STATUS_FOUND && first_err) |
2237 | err = first_err; | |
c9de560d AT |
2238 | return err; |
2239 | } | |
2240 | ||
c9de560d AT |
2241 | static void *ext4_mb_seq_groups_start(struct seq_file *seq, loff_t *pos) |
2242 | { | |
2243 | struct super_block *sb = seq->private; | |
c9de560d AT |
2244 | ext4_group_t group; |
2245 | ||
8df9675f | 2246 | if (*pos < 0 || *pos >= ext4_get_groups_count(sb)) |
c9de560d | 2247 | return NULL; |
c9de560d | 2248 | group = *pos + 1; |
a9df9a49 | 2249 | return (void *) ((unsigned long) group); |
c9de560d AT |
2250 | } |
2251 | ||
2252 | static void *ext4_mb_seq_groups_next(struct seq_file *seq, void *v, loff_t *pos) | |
2253 | { | |
2254 | struct super_block *sb = seq->private; | |
c9de560d AT |
2255 | ext4_group_t group; |
2256 | ||
2257 | ++*pos; | |
8df9675f | 2258 | if (*pos < 0 || *pos >= ext4_get_groups_count(sb)) |
c9de560d AT |
2259 | return NULL; |
2260 | group = *pos + 1; | |
a9df9a49 | 2261 | return (void *) ((unsigned long) group); |
c9de560d AT |
2262 | } |
2263 | ||
2264 | static int ext4_mb_seq_groups_show(struct seq_file *seq, void *v) | |
2265 | { | |
2266 | struct super_block *sb = seq->private; | |
a9df9a49 | 2267 | ext4_group_t group = (ext4_group_t) ((unsigned long) v); |
c9de560d | 2268 | int i; |
1c8457ca | 2269 | int err, buddy_loaded = 0; |
c9de560d | 2270 | struct ext4_buddy e4b; |
1c8457ca | 2271 | struct ext4_group_info *grinfo; |
c9de560d AT |
2272 | struct sg { |
2273 | struct ext4_group_info info; | |
a36b4498 | 2274 | ext4_grpblk_t counters[16]; |
c9de560d AT |
2275 | } sg; |
2276 | ||
2277 | group--; | |
2278 | if (group == 0) | |
97b4af2f RV |
2279 | seq_puts(seq, "#group: free frags first [" |
2280 | " 2^0 2^1 2^2 2^3 2^4 2^5 2^6 " | |
2281 | " 2^7 2^8 2^9 2^10 2^11 2^12 2^13 ]"); | |
c9de560d AT |
2282 | |
2283 | i = (sb->s_blocksize_bits + 2) * sizeof(sg.info.bb_counters[0]) + | |
2284 | sizeof(struct ext4_group_info); | |
1c8457ca AK |
2285 | grinfo = ext4_get_group_info(sb, group); |
2286 | /* Load the group info in memory only if not already loaded. */ | |
2287 | if (unlikely(EXT4_MB_GRP_NEED_INIT(grinfo))) { | |
2288 | err = ext4_mb_load_buddy(sb, group, &e4b); | |
2289 | if (err) { | |
2290 | seq_printf(seq, "#%-5u: I/O error\n", group); | |
2291 | return 0; | |
2292 | } | |
2293 | buddy_loaded = 1; | |
c9de560d | 2294 | } |
1c8457ca | 2295 | |
c9de560d | 2296 | memcpy(&sg, ext4_get_group_info(sb, group), i); |
1c8457ca AK |
2297 | |
2298 | if (buddy_loaded) | |
2299 | ext4_mb_unload_buddy(&e4b); | |
c9de560d | 2300 | |
a9df9a49 | 2301 | seq_printf(seq, "#%-5u: %-5u %-5u %-5u [", group, sg.info.bb_free, |
c9de560d AT |
2302 | sg.info.bb_fragments, sg.info.bb_first_free); |
2303 | for (i = 0; i <= 13; i++) | |
2304 | seq_printf(seq, " %-5u", i <= sb->s_blocksize_bits + 1 ? | |
2305 | sg.info.bb_counters[i] : 0); | |
2306 | seq_printf(seq, " ]\n"); | |
2307 | ||
2308 | return 0; | |
2309 | } | |
2310 | ||
2311 | static void ext4_mb_seq_groups_stop(struct seq_file *seq, void *v) | |
2312 | { | |
2313 | } | |
2314 | ||
7f1346a9 | 2315 | static const struct seq_operations ext4_mb_seq_groups_ops = { |
c9de560d AT |
2316 | .start = ext4_mb_seq_groups_start, |
2317 | .next = ext4_mb_seq_groups_next, | |
2318 | .stop = ext4_mb_seq_groups_stop, | |
2319 | .show = ext4_mb_seq_groups_show, | |
2320 | }; | |
2321 | ||
2322 | static int ext4_mb_seq_groups_open(struct inode *inode, struct file *file) | |
2323 | { | |
d9dda78b | 2324 | struct super_block *sb = PDE_DATA(inode); |
c9de560d AT |
2325 | int rc; |
2326 | ||
2327 | rc = seq_open(file, &ext4_mb_seq_groups_ops); | |
2328 | if (rc == 0) { | |
a271fe85 | 2329 | struct seq_file *m = file->private_data; |
c9de560d AT |
2330 | m->private = sb; |
2331 | } | |
2332 | return rc; | |
2333 | ||
2334 | } | |
2335 | ||
7f1346a9 | 2336 | static const struct file_operations ext4_mb_seq_groups_fops = { |
c9de560d AT |
2337 | .owner = THIS_MODULE, |
2338 | .open = ext4_mb_seq_groups_open, | |
2339 | .read = seq_read, | |
2340 | .llseek = seq_lseek, | |
2341 | .release = seq_release, | |
2342 | }; | |
2343 | ||
fb1813f4 CW |
2344 | static struct kmem_cache *get_groupinfo_cache(int blocksize_bits) |
2345 | { | |
2346 | int cache_index = blocksize_bits - EXT4_MIN_BLOCK_LOG_SIZE; | |
2347 | struct kmem_cache *cachep = ext4_groupinfo_caches[cache_index]; | |
2348 | ||
2349 | BUG_ON(!cachep); | |
2350 | return cachep; | |
2351 | } | |
5f21b0e6 | 2352 | |
28623c2f TT |
2353 | /* |
2354 | * Allocate the top-level s_group_info array for the specified number | |
2355 | * of groups | |
2356 | */ | |
2357 | int ext4_mb_alloc_groupinfo(struct super_block *sb, ext4_group_t ngroups) | |
2358 | { | |
2359 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
2360 | unsigned size; | |
2361 | struct ext4_group_info ***new_groupinfo; | |
2362 | ||
2363 | size = (ngroups + EXT4_DESC_PER_BLOCK(sb) - 1) >> | |
2364 | EXT4_DESC_PER_BLOCK_BITS(sb); | |
2365 | if (size <= sbi->s_group_info_size) | |
2366 | return 0; | |
2367 | ||
2368 | size = roundup_pow_of_two(sizeof(*sbi->s_group_info) * size); | |
2369 | new_groupinfo = ext4_kvzalloc(size, GFP_KERNEL); | |
2370 | if (!new_groupinfo) { | |
2371 | ext4_msg(sb, KERN_ERR, "can't allocate buddy meta group"); | |
2372 | return -ENOMEM; | |
2373 | } | |
2374 | if (sbi->s_group_info) { | |
2375 | memcpy(new_groupinfo, sbi->s_group_info, | |
2376 | sbi->s_group_info_size * sizeof(*sbi->s_group_info)); | |
b93b41d4 | 2377 | kvfree(sbi->s_group_info); |
28623c2f TT |
2378 | } |
2379 | sbi->s_group_info = new_groupinfo; | |
2380 | sbi->s_group_info_size = size / sizeof(*sbi->s_group_info); | |
2381 | ext4_debug("allocated s_groupinfo array for %d meta_bg's\n", | |
2382 | sbi->s_group_info_size); | |
2383 | return 0; | |
2384 | } | |
2385 | ||
5f21b0e6 | 2386 | /* Create and initialize ext4_group_info data for the given group. */ |
920313a7 | 2387 | int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group, |
5f21b0e6 FB |
2388 | struct ext4_group_desc *desc) |
2389 | { | |
fb1813f4 | 2390 | int i; |
5f21b0e6 FB |
2391 | int metalen = 0; |
2392 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
2393 | struct ext4_group_info **meta_group_info; | |
fb1813f4 | 2394 | struct kmem_cache *cachep = get_groupinfo_cache(sb->s_blocksize_bits); |
5f21b0e6 FB |
2395 | |
2396 | /* | |
2397 | * First check if this group is the first of a reserved block. | |
2398 | * If it's true, we have to allocate a new table of pointers | |
2399 | * to ext4_group_info structures | |
2400 | */ | |
2401 | if (group % EXT4_DESC_PER_BLOCK(sb) == 0) { | |
2402 | metalen = sizeof(*meta_group_info) << | |
2403 | EXT4_DESC_PER_BLOCK_BITS(sb); | |
4fdb5543 | 2404 | meta_group_info = kmalloc(metalen, GFP_NOFS); |
5f21b0e6 | 2405 | if (meta_group_info == NULL) { |
7f6a11e7 | 2406 | ext4_msg(sb, KERN_ERR, "can't allocate mem " |
9d8b9ec4 | 2407 | "for a buddy group"); |
5f21b0e6 FB |
2408 | goto exit_meta_group_info; |
2409 | } | |
2410 | sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)] = | |
2411 | meta_group_info; | |
2412 | } | |
2413 | ||
5f21b0e6 FB |
2414 | meta_group_info = |
2415 | sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)]; | |
2416 | i = group & (EXT4_DESC_PER_BLOCK(sb) - 1); | |
2417 | ||
4fdb5543 | 2418 | meta_group_info[i] = kmem_cache_zalloc(cachep, GFP_NOFS); |
5f21b0e6 | 2419 | if (meta_group_info[i] == NULL) { |
7f6a11e7 | 2420 | ext4_msg(sb, KERN_ERR, "can't allocate buddy mem"); |
5f21b0e6 FB |
2421 | goto exit_group_info; |
2422 | } | |
2423 | set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, | |
2424 | &(meta_group_info[i]->bb_state)); | |
2425 | ||
2426 | /* | |
2427 | * initialize bb_free to be able to skip | |
2428 | * empty groups without initialization | |
2429 | */ | |
2430 | if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { | |
2431 | meta_group_info[i]->bb_free = | |
cff1dfd7 | 2432 | ext4_free_clusters_after_init(sb, group, desc); |
5f21b0e6 FB |
2433 | } else { |
2434 | meta_group_info[i]->bb_free = | |
021b65bb | 2435 | ext4_free_group_clusters(sb, desc); |
5f21b0e6 FB |
2436 | } |
2437 | ||
2438 | INIT_LIST_HEAD(&meta_group_info[i]->bb_prealloc_list); | |
920313a7 | 2439 | init_rwsem(&meta_group_info[i]->alloc_sem); |
64e290ec | 2440 | meta_group_info[i]->bb_free_root = RB_ROOT; |
8a57d9d6 | 2441 | meta_group_info[i]->bb_largest_free_order = -1; /* uninit */ |
5f21b0e6 FB |
2442 | |
2443 | #ifdef DOUBLE_CHECK | |
2444 | { | |
2445 | struct buffer_head *bh; | |
2446 | meta_group_info[i]->bb_bitmap = | |
4fdb5543 | 2447 | kmalloc(sb->s_blocksize, GFP_NOFS); |
5f21b0e6 FB |
2448 | BUG_ON(meta_group_info[i]->bb_bitmap == NULL); |
2449 | bh = ext4_read_block_bitmap(sb, group); | |
2450 | BUG_ON(bh == NULL); | |
2451 | memcpy(meta_group_info[i]->bb_bitmap, bh->b_data, | |
2452 | sb->s_blocksize); | |
2453 | put_bh(bh); | |
2454 | } | |
2455 | #endif | |
2456 | ||
2457 | return 0; | |
2458 | ||
2459 | exit_group_info: | |
2460 | /* If a meta_group_info table has been allocated, release it now */ | |
caaf7a29 | 2461 | if (group % EXT4_DESC_PER_BLOCK(sb) == 0) { |
5f21b0e6 | 2462 | kfree(sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)]); |
caaf7a29 TM |
2463 | sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)] = NULL; |
2464 | } | |
5f21b0e6 FB |
2465 | exit_meta_group_info: |
2466 | return -ENOMEM; | |
2467 | } /* ext4_mb_add_groupinfo */ | |
2468 | ||
c9de560d AT |
2469 | static int ext4_mb_init_backend(struct super_block *sb) |
2470 | { | |
8df9675f | 2471 | ext4_group_t ngroups = ext4_get_groups_count(sb); |
c9de560d | 2472 | ext4_group_t i; |
c9de560d | 2473 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
28623c2f | 2474 | int err; |
5f21b0e6 | 2475 | struct ext4_group_desc *desc; |
fb1813f4 | 2476 | struct kmem_cache *cachep; |
5f21b0e6 | 2477 | |
28623c2f TT |
2478 | err = ext4_mb_alloc_groupinfo(sb, ngroups); |
2479 | if (err) | |
2480 | return err; | |
c9de560d | 2481 | |
c9de560d AT |
2482 | sbi->s_buddy_cache = new_inode(sb); |
2483 | if (sbi->s_buddy_cache == NULL) { | |
9d8b9ec4 | 2484 | ext4_msg(sb, KERN_ERR, "can't get new inode"); |
c9de560d AT |
2485 | goto err_freesgi; |
2486 | } | |
48e6061b YJ |
2487 | /* To avoid potentially colliding with an valid on-disk inode number, |
2488 | * use EXT4_BAD_INO for the buddy cache inode number. This inode is | |
2489 | * not in the inode hash, so it should never be found by iget(), but | |
2490 | * this will avoid confusion if it ever shows up during debugging. */ | |
2491 | sbi->s_buddy_cache->i_ino = EXT4_BAD_INO; | |
c9de560d | 2492 | EXT4_I(sbi->s_buddy_cache)->i_disksize = 0; |
8df9675f | 2493 | for (i = 0; i < ngroups; i++) { |
c9de560d AT |
2494 | desc = ext4_get_group_desc(sb, i, NULL); |
2495 | if (desc == NULL) { | |
9d8b9ec4 | 2496 | ext4_msg(sb, KERN_ERR, "can't read descriptor %u", i); |
c9de560d AT |
2497 | goto err_freebuddy; |
2498 | } | |
5f21b0e6 FB |
2499 | if (ext4_mb_add_groupinfo(sb, i, desc) != 0) |
2500 | goto err_freebuddy; | |
c9de560d AT |
2501 | } |
2502 | ||
2503 | return 0; | |
2504 | ||
2505 | err_freebuddy: | |
fb1813f4 | 2506 | cachep = get_groupinfo_cache(sb->s_blocksize_bits); |
f1fa3342 | 2507 | while (i-- > 0) |
fb1813f4 | 2508 | kmem_cache_free(cachep, ext4_get_group_info(sb, i)); |
28623c2f | 2509 | i = sbi->s_group_info_size; |
f1fa3342 | 2510 | while (i-- > 0) |
c9de560d AT |
2511 | kfree(sbi->s_group_info[i]); |
2512 | iput(sbi->s_buddy_cache); | |
2513 | err_freesgi: | |
b93b41d4 | 2514 | kvfree(sbi->s_group_info); |
c9de560d AT |
2515 | return -ENOMEM; |
2516 | } | |
2517 | ||
2892c15d ES |
2518 | static void ext4_groupinfo_destroy_slabs(void) |
2519 | { | |
2520 | int i; | |
2521 | ||
2522 | for (i = 0; i < NR_GRPINFO_CACHES; i++) { | |
2523 | if (ext4_groupinfo_caches[i]) | |
2524 | kmem_cache_destroy(ext4_groupinfo_caches[i]); | |
2525 | ext4_groupinfo_caches[i] = NULL; | |
2526 | } | |
2527 | } | |
2528 | ||
2529 | static int ext4_groupinfo_create_slab(size_t size) | |
2530 | { | |
2531 | static DEFINE_MUTEX(ext4_grpinfo_slab_create_mutex); | |
2532 | int slab_size; | |
2533 | int blocksize_bits = order_base_2(size); | |
2534 | int cache_index = blocksize_bits - EXT4_MIN_BLOCK_LOG_SIZE; | |
2535 | struct kmem_cache *cachep; | |
2536 | ||
2537 | if (cache_index >= NR_GRPINFO_CACHES) | |
2538 | return -EINVAL; | |
2539 | ||
2540 | if (unlikely(cache_index < 0)) | |
2541 | cache_index = 0; | |
2542 | ||
2543 | mutex_lock(&ext4_grpinfo_slab_create_mutex); | |
2544 | if (ext4_groupinfo_caches[cache_index]) { | |
2545 | mutex_unlock(&ext4_grpinfo_slab_create_mutex); | |
2546 | return 0; /* Already created */ | |
2547 | } | |
2548 | ||
2549 | slab_size = offsetof(struct ext4_group_info, | |
2550 | bb_counters[blocksize_bits + 2]); | |
2551 | ||
2552 | cachep = kmem_cache_create(ext4_groupinfo_slab_names[cache_index], | |
2553 | slab_size, 0, SLAB_RECLAIM_ACCOUNT, | |
2554 | NULL); | |
2555 | ||
823ba01f TM |
2556 | ext4_groupinfo_caches[cache_index] = cachep; |
2557 | ||
2892c15d ES |
2558 | mutex_unlock(&ext4_grpinfo_slab_create_mutex); |
2559 | if (!cachep) { | |
9d8b9ec4 TT |
2560 | printk(KERN_EMERG |
2561 | "EXT4-fs: no memory for groupinfo slab cache\n"); | |
2892c15d ES |
2562 | return -ENOMEM; |
2563 | } | |
2564 | ||
2892c15d ES |
2565 | return 0; |
2566 | } | |
2567 | ||
9d99012f | 2568 | int ext4_mb_init(struct super_block *sb) |
c9de560d AT |
2569 | { |
2570 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
6be2ded1 | 2571 | unsigned i, j; |
c9de560d AT |
2572 | unsigned offset; |
2573 | unsigned max; | |
74767c5a | 2574 | int ret; |
c9de560d | 2575 | |
1927805e | 2576 | i = (sb->s_blocksize_bits + 2) * sizeof(*sbi->s_mb_offsets); |
c9de560d AT |
2577 | |
2578 | sbi->s_mb_offsets = kmalloc(i, GFP_KERNEL); | |
2579 | if (sbi->s_mb_offsets == NULL) { | |
fb1813f4 CW |
2580 | ret = -ENOMEM; |
2581 | goto out; | |
c9de560d | 2582 | } |
ff7ef329 | 2583 | |
1927805e | 2584 | i = (sb->s_blocksize_bits + 2) * sizeof(*sbi->s_mb_maxs); |
c9de560d AT |
2585 | sbi->s_mb_maxs = kmalloc(i, GFP_KERNEL); |
2586 | if (sbi->s_mb_maxs == NULL) { | |
fb1813f4 CW |
2587 | ret = -ENOMEM; |
2588 | goto out; | |
2589 | } | |
2590 | ||
2892c15d ES |
2591 | ret = ext4_groupinfo_create_slab(sb->s_blocksize); |
2592 | if (ret < 0) | |
2593 | goto out; | |
c9de560d AT |
2594 | |
2595 | /* order 0 is regular bitmap */ | |
2596 | sbi->s_mb_maxs[0] = sb->s_blocksize << 3; | |
2597 | sbi->s_mb_offsets[0] = 0; | |
2598 | ||
2599 | i = 1; | |
2600 | offset = 0; | |
2601 | max = sb->s_blocksize << 2; | |
2602 | do { | |
2603 | sbi->s_mb_offsets[i] = offset; | |
2604 | sbi->s_mb_maxs[i] = max; | |
2605 | offset += 1 << (sb->s_blocksize_bits - i); | |
2606 | max = max >> 1; | |
2607 | i++; | |
2608 | } while (i <= sb->s_blocksize_bits + 1); | |
2609 | ||
c9de560d | 2610 | spin_lock_init(&sbi->s_md_lock); |
c9de560d AT |
2611 | spin_lock_init(&sbi->s_bal_lock); |
2612 | ||
2613 | sbi->s_mb_max_to_scan = MB_DEFAULT_MAX_TO_SCAN; | |
2614 | sbi->s_mb_min_to_scan = MB_DEFAULT_MIN_TO_SCAN; | |
2615 | sbi->s_mb_stats = MB_DEFAULT_STATS; | |
2616 | sbi->s_mb_stream_request = MB_DEFAULT_STREAM_THRESHOLD; | |
2617 | sbi->s_mb_order2_reqs = MB_DEFAULT_ORDER2_REQS; | |
27baebb8 TT |
2618 | /* |
2619 | * The default group preallocation is 512, which for 4k block | |
2620 | * sizes translates to 2 megabytes. However for bigalloc file | |
2621 | * systems, this is probably too big (i.e, if the cluster size | |
2622 | * is 1 megabyte, then group preallocation size becomes half a | |
2623 | * gigabyte!). As a default, we will keep a two megabyte | |
2624 | * group pralloc size for cluster sizes up to 64k, and after | |
2625 | * that, we will force a minimum group preallocation size of | |
2626 | * 32 clusters. This translates to 8 megs when the cluster | |
2627 | * size is 256k, and 32 megs when the cluster size is 1 meg, | |
2628 | * which seems reasonable as a default. | |
2629 | */ | |
2630 | sbi->s_mb_group_prealloc = max(MB_DEFAULT_GROUP_PREALLOC >> | |
2631 | sbi->s_cluster_bits, 32); | |
d7a1fee1 DE |
2632 | /* |
2633 | * If there is a s_stripe > 1, then we set the s_mb_group_prealloc | |
2634 | * to the lowest multiple of s_stripe which is bigger than | |
2635 | * the s_mb_group_prealloc as determined above. We want | |
2636 | * the preallocation size to be an exact multiple of the | |
2637 | * RAID stripe size so that preallocations don't fragment | |
2638 | * the stripes. | |
2639 | */ | |
2640 | if (sbi->s_stripe > 1) { | |
2641 | sbi->s_mb_group_prealloc = roundup( | |
2642 | sbi->s_mb_group_prealloc, sbi->s_stripe); | |
2643 | } | |
c9de560d | 2644 | |
730c213c | 2645 | sbi->s_locality_groups = alloc_percpu(struct ext4_locality_group); |
c9de560d | 2646 | if (sbi->s_locality_groups == NULL) { |
fb1813f4 | 2647 | ret = -ENOMEM; |
029b10c5 | 2648 | goto out; |
c9de560d | 2649 | } |
730c213c | 2650 | for_each_possible_cpu(i) { |
c9de560d | 2651 | struct ext4_locality_group *lg; |
730c213c | 2652 | lg = per_cpu_ptr(sbi->s_locality_groups, i); |
c9de560d | 2653 | mutex_init(&lg->lg_mutex); |
6be2ded1 AK |
2654 | for (j = 0; j < PREALLOC_TB_SIZE; j++) |
2655 | INIT_LIST_HEAD(&lg->lg_prealloc_list[j]); | |
c9de560d AT |
2656 | spin_lock_init(&lg->lg_prealloc_lock); |
2657 | } | |
2658 | ||
79a77c5a YJ |
2659 | /* init file for buddy data */ |
2660 | ret = ext4_mb_init_backend(sb); | |
7aa0baea TM |
2661 | if (ret != 0) |
2662 | goto out_free_locality_groups; | |
79a77c5a | 2663 | |
296c355c TT |
2664 | if (sbi->s_proc) |
2665 | proc_create_data("mb_groups", S_IRUGO, sbi->s_proc, | |
2666 | &ext4_mb_seq_groups_fops, sb); | |
c9de560d | 2667 | |
7aa0baea TM |
2668 | return 0; |
2669 | ||
2670 | out_free_locality_groups: | |
2671 | free_percpu(sbi->s_locality_groups); | |
2672 | sbi->s_locality_groups = NULL; | |
fb1813f4 | 2673 | out: |
7aa0baea TM |
2674 | kfree(sbi->s_mb_offsets); |
2675 | sbi->s_mb_offsets = NULL; | |
2676 | kfree(sbi->s_mb_maxs); | |
2677 | sbi->s_mb_maxs = NULL; | |
fb1813f4 | 2678 | return ret; |
c9de560d AT |
2679 | } |
2680 | ||
955ce5f5 | 2681 | /* need to called with the ext4 group lock held */ |
c9de560d AT |
2682 | static void ext4_mb_cleanup_pa(struct ext4_group_info *grp) |
2683 | { | |
2684 | struct ext4_prealloc_space *pa; | |
2685 | struct list_head *cur, *tmp; | |
2686 | int count = 0; | |
2687 | ||
2688 | list_for_each_safe(cur, tmp, &grp->bb_prealloc_list) { | |
2689 | pa = list_entry(cur, struct ext4_prealloc_space, pa_group_list); | |
2690 | list_del(&pa->pa_group_list); | |
2691 | count++; | |
688f05a0 | 2692 | kmem_cache_free(ext4_pspace_cachep, pa); |
c9de560d AT |
2693 | } |
2694 | if (count) | |
6ba495e9 | 2695 | mb_debug(1, "mballoc: %u PAs left\n", count); |
c9de560d AT |
2696 | |
2697 | } | |
2698 | ||
2699 | int ext4_mb_release(struct super_block *sb) | |
2700 | { | |
8df9675f | 2701 | ext4_group_t ngroups = ext4_get_groups_count(sb); |
c9de560d AT |
2702 | ext4_group_t i; |
2703 | int num_meta_group_infos; | |
2704 | struct ext4_group_info *grinfo; | |
2705 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
fb1813f4 | 2706 | struct kmem_cache *cachep = get_groupinfo_cache(sb->s_blocksize_bits); |
c9de560d | 2707 | |
95599968 SQ |
2708 | if (sbi->s_proc) |
2709 | remove_proc_entry("mb_groups", sbi->s_proc); | |
2710 | ||
c9de560d | 2711 | if (sbi->s_group_info) { |
8df9675f | 2712 | for (i = 0; i < ngroups; i++) { |
c9de560d AT |
2713 | grinfo = ext4_get_group_info(sb, i); |
2714 | #ifdef DOUBLE_CHECK | |
2715 | kfree(grinfo->bb_bitmap); | |
2716 | #endif | |
2717 | ext4_lock_group(sb, i); | |
2718 | ext4_mb_cleanup_pa(grinfo); | |
2719 | ext4_unlock_group(sb, i); | |
fb1813f4 | 2720 | kmem_cache_free(cachep, grinfo); |
c9de560d | 2721 | } |
8df9675f | 2722 | num_meta_group_infos = (ngroups + |
c9de560d AT |
2723 | EXT4_DESC_PER_BLOCK(sb) - 1) >> |
2724 | EXT4_DESC_PER_BLOCK_BITS(sb); | |
2725 | for (i = 0; i < num_meta_group_infos; i++) | |
2726 | kfree(sbi->s_group_info[i]); | |
b93b41d4 | 2727 | kvfree(sbi->s_group_info); |
c9de560d AT |
2728 | } |
2729 | kfree(sbi->s_mb_offsets); | |
2730 | kfree(sbi->s_mb_maxs); | |
bfcba2d0 | 2731 | iput(sbi->s_buddy_cache); |
c9de560d | 2732 | if (sbi->s_mb_stats) { |
9d8b9ec4 TT |
2733 | ext4_msg(sb, KERN_INFO, |
2734 | "mballoc: %u blocks %u reqs (%u success)", | |
c9de560d AT |
2735 | atomic_read(&sbi->s_bal_allocated), |
2736 | atomic_read(&sbi->s_bal_reqs), | |
2737 | atomic_read(&sbi->s_bal_success)); | |
9d8b9ec4 TT |
2738 | ext4_msg(sb, KERN_INFO, |
2739 | "mballoc: %u extents scanned, %u goal hits, " | |
2740 | "%u 2^N hits, %u breaks, %u lost", | |
c9de560d AT |
2741 | atomic_read(&sbi->s_bal_ex_scanned), |
2742 | atomic_read(&sbi->s_bal_goals), | |
2743 | atomic_read(&sbi->s_bal_2orders), | |
2744 | atomic_read(&sbi->s_bal_breaks), | |
2745 | atomic_read(&sbi->s_mb_lost_chunks)); | |
9d8b9ec4 TT |
2746 | ext4_msg(sb, KERN_INFO, |
2747 | "mballoc: %lu generated and it took %Lu", | |
ced156e4 | 2748 | sbi->s_mb_buddies_generated, |
c9de560d | 2749 | sbi->s_mb_generation_time); |
9d8b9ec4 TT |
2750 | ext4_msg(sb, KERN_INFO, |
2751 | "mballoc: %u preallocated, %u discarded", | |
c9de560d AT |
2752 | atomic_read(&sbi->s_mb_preallocated), |
2753 | atomic_read(&sbi->s_mb_discarded)); | |
2754 | } | |
2755 | ||
730c213c | 2756 | free_percpu(sbi->s_locality_groups); |
c9de560d AT |
2757 | |
2758 | return 0; | |
2759 | } | |
2760 | ||
77ca6cdf | 2761 | static inline int ext4_issue_discard(struct super_block *sb, |
84130193 | 2762 | ext4_group_t block_group, ext4_grpblk_t cluster, int count) |
5c521830 | 2763 | { |
5c521830 JZ |
2764 | ext4_fsblk_t discard_block; |
2765 | ||
84130193 TT |
2766 | discard_block = (EXT4_C2B(EXT4_SB(sb), cluster) + |
2767 | ext4_group_first_block_no(sb, block_group)); | |
2768 | count = EXT4_C2B(EXT4_SB(sb), count); | |
5c521830 JZ |
2769 | trace_ext4_discard_blocks(sb, |
2770 | (unsigned long long) discard_block, count); | |
93259636 | 2771 | return sb_issue_discard(sb, discard_block, count, GFP_NOFS, 0); |
5c521830 JZ |
2772 | } |
2773 | ||
3e624fc7 TT |
2774 | /* |
2775 | * This function is called by the jbd2 layer once the commit has finished, | |
2776 | * so we know we can free the blocks that were released with that commit. | |
2777 | */ | |
18aadd47 BJ |
2778 | static void ext4_free_data_callback(struct super_block *sb, |
2779 | struct ext4_journal_cb_entry *jce, | |
2780 | int rc) | |
c9de560d | 2781 | { |
18aadd47 | 2782 | struct ext4_free_data *entry = (struct ext4_free_data *)jce; |
c9de560d | 2783 | struct ext4_buddy e4b; |
c894058d | 2784 | struct ext4_group_info *db; |
d9f34504 | 2785 | int err, count = 0, count2 = 0; |
c9de560d | 2786 | |
18aadd47 BJ |
2787 | mb_debug(1, "gonna free %u blocks in group %u (0x%p):", |
2788 | entry->efd_count, entry->efd_group, entry); | |
c9de560d | 2789 | |
d71c1ae2 LC |
2790 | if (test_opt(sb, DISCARD)) { |
2791 | err = ext4_issue_discard(sb, entry->efd_group, | |
2792 | entry->efd_start_cluster, | |
2793 | entry->efd_count); | |
2794 | if (err && err != -EOPNOTSUPP) | |
2795 | ext4_msg(sb, KERN_WARNING, "discard request in" | |
2796 | " group:%d block:%d count:%d failed" | |
2797 | " with %d", entry->efd_group, | |
2798 | entry->efd_start_cluster, | |
2799 | entry->efd_count, err); | |
2800 | } | |
c9de560d | 2801 | |
18aadd47 BJ |
2802 | err = ext4_mb_load_buddy(sb, entry->efd_group, &e4b); |
2803 | /* we expect to find existing buddy because it's pinned */ | |
2804 | BUG_ON(err != 0); | |
b90f6870 | 2805 | |
c9de560d | 2806 | |
18aadd47 BJ |
2807 | db = e4b.bd_info; |
2808 | /* there are blocks to put in buddy to make them really free */ | |
2809 | count += entry->efd_count; | |
2810 | count2++; | |
2811 | ext4_lock_group(sb, entry->efd_group); | |
2812 | /* Take it out of per group rb tree */ | |
2813 | rb_erase(&entry->efd_node, &(db->bb_free_root)); | |
2814 | mb_free_blocks(NULL, &e4b, entry->efd_start_cluster, entry->efd_count); | |
c894058d | 2815 | |
18aadd47 BJ |
2816 | /* |
2817 | * Clear the trimmed flag for the group so that the next | |
2818 | * ext4_trim_fs can trim it. | |
2819 | * If the volume is mounted with -o discard, online discard | |
2820 | * is supported and the free blocks will be trimmed online. | |
2821 | */ | |
2822 | if (!test_opt(sb, DISCARD)) | |
2823 | EXT4_MB_GRP_CLEAR_TRIMMED(db); | |
3d56b8d2 | 2824 | |
18aadd47 BJ |
2825 | if (!db->bb_free_root.rb_node) { |
2826 | /* No more items in the per group rb tree | |
2827 | * balance refcounts from ext4_mb_free_metadata() | |
2828 | */ | |
2829 | page_cache_release(e4b.bd_buddy_page); | |
2830 | page_cache_release(e4b.bd_bitmap_page); | |
3e624fc7 | 2831 | } |
18aadd47 BJ |
2832 | ext4_unlock_group(sb, entry->efd_group); |
2833 | kmem_cache_free(ext4_free_data_cachep, entry); | |
2834 | ext4_mb_unload_buddy(&e4b); | |
c9de560d | 2835 | |
6ba495e9 | 2836 | mb_debug(1, "freed %u blocks in %u structures\n", count, count2); |
c9de560d AT |
2837 | } |
2838 | ||
5dabfc78 | 2839 | int __init ext4_init_mballoc(void) |
c9de560d | 2840 | { |
16828088 TT |
2841 | ext4_pspace_cachep = KMEM_CACHE(ext4_prealloc_space, |
2842 | SLAB_RECLAIM_ACCOUNT); | |
c9de560d AT |
2843 | if (ext4_pspace_cachep == NULL) |
2844 | return -ENOMEM; | |
2845 | ||
16828088 TT |
2846 | ext4_ac_cachep = KMEM_CACHE(ext4_allocation_context, |
2847 | SLAB_RECLAIM_ACCOUNT); | |
256bdb49 ES |
2848 | if (ext4_ac_cachep == NULL) { |
2849 | kmem_cache_destroy(ext4_pspace_cachep); | |
2850 | return -ENOMEM; | |
2851 | } | |
c894058d | 2852 | |
18aadd47 BJ |
2853 | ext4_free_data_cachep = KMEM_CACHE(ext4_free_data, |
2854 | SLAB_RECLAIM_ACCOUNT); | |
2855 | if (ext4_free_data_cachep == NULL) { | |
c894058d AK |
2856 | kmem_cache_destroy(ext4_pspace_cachep); |
2857 | kmem_cache_destroy(ext4_ac_cachep); | |
2858 | return -ENOMEM; | |
2859 | } | |
c9de560d AT |
2860 | return 0; |
2861 | } | |
2862 | ||
5dabfc78 | 2863 | void ext4_exit_mballoc(void) |
c9de560d | 2864 | { |
60e6679e | 2865 | /* |
3e03f9ca JDB |
2866 | * Wait for completion of call_rcu()'s on ext4_pspace_cachep |
2867 | * before destroying the slab cache. | |
2868 | */ | |
2869 | rcu_barrier(); | |
c9de560d | 2870 | kmem_cache_destroy(ext4_pspace_cachep); |
256bdb49 | 2871 | kmem_cache_destroy(ext4_ac_cachep); |
18aadd47 | 2872 | kmem_cache_destroy(ext4_free_data_cachep); |
2892c15d | 2873 | ext4_groupinfo_destroy_slabs(); |
c9de560d AT |
2874 | } |
2875 | ||
2876 | ||
2877 | /* | |
73b2c716 | 2878 | * Check quota and mark chosen space (ac->ac_b_ex) non-free in bitmaps |
c9de560d AT |
2879 | * Returns 0 if success or error code |
2880 | */ | |
4ddfef7b ES |
2881 | static noinline_for_stack int |
2882 | ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac, | |
53accfa9 | 2883 | handle_t *handle, unsigned int reserv_clstrs) |
c9de560d AT |
2884 | { |
2885 | struct buffer_head *bitmap_bh = NULL; | |
c9de560d AT |
2886 | struct ext4_group_desc *gdp; |
2887 | struct buffer_head *gdp_bh; | |
2888 | struct ext4_sb_info *sbi; | |
2889 | struct super_block *sb; | |
2890 | ext4_fsblk_t block; | |
519deca0 | 2891 | int err, len; |
c9de560d AT |
2892 | |
2893 | BUG_ON(ac->ac_status != AC_STATUS_FOUND); | |
2894 | BUG_ON(ac->ac_b_ex.fe_len <= 0); | |
2895 | ||
2896 | sb = ac->ac_sb; | |
2897 | sbi = EXT4_SB(sb); | |
c9de560d AT |
2898 | |
2899 | err = -EIO; | |
574ca174 | 2900 | bitmap_bh = ext4_read_block_bitmap(sb, ac->ac_b_ex.fe_group); |
c9de560d AT |
2901 | if (!bitmap_bh) |
2902 | goto out_err; | |
2903 | ||
5d601255 | 2904 | BUFFER_TRACE(bitmap_bh, "getting write access"); |
c9de560d AT |
2905 | err = ext4_journal_get_write_access(handle, bitmap_bh); |
2906 | if (err) | |
2907 | goto out_err; | |
2908 | ||
2909 | err = -EIO; | |
2910 | gdp = ext4_get_group_desc(sb, ac->ac_b_ex.fe_group, &gdp_bh); | |
2911 | if (!gdp) | |
2912 | goto out_err; | |
2913 | ||
a9df9a49 | 2914 | ext4_debug("using block group %u(%d)\n", ac->ac_b_ex.fe_group, |
021b65bb | 2915 | ext4_free_group_clusters(sb, gdp)); |
03cddb80 | 2916 | |
5d601255 | 2917 | BUFFER_TRACE(gdp_bh, "get_write_access"); |
c9de560d AT |
2918 | err = ext4_journal_get_write_access(handle, gdp_bh); |
2919 | if (err) | |
2920 | goto out_err; | |
2921 | ||
bda00de7 | 2922 | block = ext4_grp_offs_to_block(sb, &ac->ac_b_ex); |
c9de560d | 2923 | |
53accfa9 | 2924 | len = EXT4_C2B(sbi, ac->ac_b_ex.fe_len); |
6fd058f7 | 2925 | if (!ext4_data_block_valid(sbi, block, len)) { |
12062ddd | 2926 | ext4_error(sb, "Allocating blocks %llu-%llu which overlap " |
1084f252 | 2927 | "fs metadata", block, block+len); |
519deca0 AK |
2928 | /* File system mounted not to panic on error |
2929 | * Fix the bitmap and repeat the block allocation | |
2930 | * We leak some of the blocks here. | |
2931 | */ | |
955ce5f5 | 2932 | ext4_lock_group(sb, ac->ac_b_ex.fe_group); |
c3e94d1d YY |
2933 | ext4_set_bits(bitmap_bh->b_data, ac->ac_b_ex.fe_start, |
2934 | ac->ac_b_ex.fe_len); | |
955ce5f5 | 2935 | ext4_unlock_group(sb, ac->ac_b_ex.fe_group); |
0390131b | 2936 | err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); |
519deca0 AK |
2937 | if (!err) |
2938 | err = -EAGAIN; | |
2939 | goto out_err; | |
c9de560d | 2940 | } |
955ce5f5 AK |
2941 | |
2942 | ext4_lock_group(sb, ac->ac_b_ex.fe_group); | |
c9de560d AT |
2943 | #ifdef AGGRESSIVE_CHECK |
2944 | { | |
2945 | int i; | |
2946 | for (i = 0; i < ac->ac_b_ex.fe_len; i++) { | |
2947 | BUG_ON(mb_test_bit(ac->ac_b_ex.fe_start + i, | |
2948 | bitmap_bh->b_data)); | |
2949 | } | |
2950 | } | |
2951 | #endif | |
c3e94d1d YY |
2952 | ext4_set_bits(bitmap_bh->b_data, ac->ac_b_ex.fe_start, |
2953 | ac->ac_b_ex.fe_len); | |
c9de560d AT |
2954 | if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { |
2955 | gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT); | |
021b65bb | 2956 | ext4_free_group_clusters_set(sb, gdp, |
cff1dfd7 | 2957 | ext4_free_clusters_after_init(sb, |
021b65bb | 2958 | ac->ac_b_ex.fe_group, gdp)); |
c9de560d | 2959 | } |
021b65bb TT |
2960 | len = ext4_free_group_clusters(sb, gdp) - ac->ac_b_ex.fe_len; |
2961 | ext4_free_group_clusters_set(sb, gdp, len); | |
79f1ba49 | 2962 | ext4_block_bitmap_csum_set(sb, ac->ac_b_ex.fe_group, gdp, bitmap_bh); |
feb0ab32 | 2963 | ext4_group_desc_csum_set(sb, ac->ac_b_ex.fe_group, gdp); |
955ce5f5 AK |
2964 | |
2965 | ext4_unlock_group(sb, ac->ac_b_ex.fe_group); | |
57042651 | 2966 | percpu_counter_sub(&sbi->s_freeclusters_counter, ac->ac_b_ex.fe_len); |
d2a17637 | 2967 | /* |
6bc6e63f | 2968 | * Now reduce the dirty block count also. Should not go negative |
d2a17637 | 2969 | */ |
6bc6e63f AK |
2970 | if (!(ac->ac_flags & EXT4_MB_DELALLOC_RESERVED)) |
2971 | /* release all the reserved blocks if non delalloc */ | |
57042651 TT |
2972 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, |
2973 | reserv_clstrs); | |
c9de560d | 2974 | |
772cb7c8 JS |
2975 | if (sbi->s_log_groups_per_flex) { |
2976 | ext4_group_t flex_group = ext4_flex_group(sbi, | |
2977 | ac->ac_b_ex.fe_group); | |
90ba983f TT |
2978 | atomic64_sub(ac->ac_b_ex.fe_len, |
2979 | &sbi->s_flex_groups[flex_group].free_clusters); | |
772cb7c8 JS |
2980 | } |
2981 | ||
0390131b | 2982 | err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); |
c9de560d AT |
2983 | if (err) |
2984 | goto out_err; | |
0390131b | 2985 | err = ext4_handle_dirty_metadata(handle, NULL, gdp_bh); |
c9de560d AT |
2986 | |
2987 | out_err: | |
42a10add | 2988 | brelse(bitmap_bh); |
c9de560d AT |
2989 | return err; |
2990 | } | |
2991 | ||
2992 | /* | |
2993 | * here we normalize request for locality group | |
d7a1fee1 DE |
2994 | * Group request are normalized to s_mb_group_prealloc, which goes to |
2995 | * s_strip if we set the same via mount option. | |
2996 | * s_mb_group_prealloc can be configured via | |
b713a5ec | 2997 | * /sys/fs/ext4/<partition>/mb_group_prealloc |
c9de560d AT |
2998 | * |
2999 | * XXX: should we try to preallocate more than the group has now? | |
3000 | */ | |
3001 | static void ext4_mb_normalize_group_request(struct ext4_allocation_context *ac) | |
3002 | { | |
3003 | struct super_block *sb = ac->ac_sb; | |
3004 | struct ext4_locality_group *lg = ac->ac_lg; | |
3005 | ||
3006 | BUG_ON(lg == NULL); | |
d7a1fee1 | 3007 | ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc; |
6ba495e9 | 3008 | mb_debug(1, "#%u: goal %u blocks for locality group\n", |
c9de560d AT |
3009 | current->pid, ac->ac_g_ex.fe_len); |
3010 | } | |
3011 | ||
3012 | /* | |
3013 | * Normalization means making request better in terms of | |
3014 | * size and alignment | |
3015 | */ | |
4ddfef7b ES |
3016 | static noinline_for_stack void |
3017 | ext4_mb_normalize_request(struct ext4_allocation_context *ac, | |
c9de560d AT |
3018 | struct ext4_allocation_request *ar) |
3019 | { | |
53accfa9 | 3020 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); |
c9de560d AT |
3021 | int bsbits, max; |
3022 | ext4_lblk_t end; | |
1592d2c5 CW |
3023 | loff_t size, start_off; |
3024 | loff_t orig_size __maybe_unused; | |
5a0790c2 | 3025 | ext4_lblk_t start; |
c9de560d | 3026 | struct ext4_inode_info *ei = EXT4_I(ac->ac_inode); |
9a0762c5 | 3027 | struct ext4_prealloc_space *pa; |
c9de560d AT |
3028 | |
3029 | /* do normalize only data requests, metadata requests | |
3030 | do not need preallocation */ | |
3031 | if (!(ac->ac_flags & EXT4_MB_HINT_DATA)) | |
3032 | return; | |
3033 | ||
3034 | /* sometime caller may want exact blocks */ | |
3035 | if (unlikely(ac->ac_flags & EXT4_MB_HINT_GOAL_ONLY)) | |
3036 | return; | |
3037 | ||
3038 | /* caller may indicate that preallocation isn't | |
3039 | * required (it's a tail, for example) */ | |
3040 | if (ac->ac_flags & EXT4_MB_HINT_NOPREALLOC) | |
3041 | return; | |
3042 | ||
3043 | if (ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC) { | |
3044 | ext4_mb_normalize_group_request(ac); | |
3045 | return ; | |
3046 | } | |
3047 | ||
3048 | bsbits = ac->ac_sb->s_blocksize_bits; | |
3049 | ||
3050 | /* first, let's learn actual file size | |
3051 | * given current request is allocated */ | |
53accfa9 | 3052 | size = ac->ac_o_ex.fe_logical + EXT4_C2B(sbi, ac->ac_o_ex.fe_len); |
c9de560d AT |
3053 | size = size << bsbits; |
3054 | if (size < i_size_read(ac->ac_inode)) | |
3055 | size = i_size_read(ac->ac_inode); | |
5a0790c2 | 3056 | orig_size = size; |
c9de560d | 3057 | |
1930479c VC |
3058 | /* max size of free chunks */ |
3059 | max = 2 << bsbits; | |
c9de560d | 3060 | |
1930479c VC |
3061 | #define NRL_CHECK_SIZE(req, size, max, chunk_size) \ |
3062 | (req <= (size) || max <= (chunk_size)) | |
c9de560d AT |
3063 | |
3064 | /* first, try to predict filesize */ | |
3065 | /* XXX: should this table be tunable? */ | |
3066 | start_off = 0; | |
3067 | if (size <= 16 * 1024) { | |
3068 | size = 16 * 1024; | |
3069 | } else if (size <= 32 * 1024) { | |
3070 | size = 32 * 1024; | |
3071 | } else if (size <= 64 * 1024) { | |
3072 | size = 64 * 1024; | |
3073 | } else if (size <= 128 * 1024) { | |
3074 | size = 128 * 1024; | |
3075 | } else if (size <= 256 * 1024) { | |
3076 | size = 256 * 1024; | |
3077 | } else if (size <= 512 * 1024) { | |
3078 | size = 512 * 1024; | |
3079 | } else if (size <= 1024 * 1024) { | |
3080 | size = 1024 * 1024; | |
1930479c | 3081 | } else if (NRL_CHECK_SIZE(size, 4 * 1024 * 1024, max, 2 * 1024)) { |
c9de560d | 3082 | start_off = ((loff_t)ac->ac_o_ex.fe_logical >> |
1930479c VC |
3083 | (21 - bsbits)) << 21; |
3084 | size = 2 * 1024 * 1024; | |
3085 | } else if (NRL_CHECK_SIZE(size, 8 * 1024 * 1024, max, 4 * 1024)) { | |
c9de560d AT |
3086 | start_off = ((loff_t)ac->ac_o_ex.fe_logical >> |
3087 | (22 - bsbits)) << 22; | |
3088 | size = 4 * 1024 * 1024; | |
3089 | } else if (NRL_CHECK_SIZE(ac->ac_o_ex.fe_len, | |
1930479c | 3090 | (8<<20)>>bsbits, max, 8 * 1024)) { |
c9de560d AT |
3091 | start_off = ((loff_t)ac->ac_o_ex.fe_logical >> |
3092 | (23 - bsbits)) << 23; | |
3093 | size = 8 * 1024 * 1024; | |
3094 | } else { | |
b27b1535 XW |
3095 | start_off = (loff_t) ac->ac_o_ex.fe_logical << bsbits; |
3096 | size = (loff_t) EXT4_C2B(EXT4_SB(ac->ac_sb), | |
3097 | ac->ac_o_ex.fe_len) << bsbits; | |
c9de560d | 3098 | } |
5a0790c2 AK |
3099 | size = size >> bsbits; |
3100 | start = start_off >> bsbits; | |
c9de560d AT |
3101 | |
3102 | /* don't cover already allocated blocks in selected range */ | |
3103 | if (ar->pleft && start <= ar->lleft) { | |
3104 | size -= ar->lleft + 1 - start; | |
3105 | start = ar->lleft + 1; | |
3106 | } | |
3107 | if (ar->pright && start + size - 1 >= ar->lright) | |
3108 | size -= start + size - ar->lright; | |
3109 | ||
3110 | end = start + size; | |
3111 | ||
3112 | /* check we don't cross already preallocated blocks */ | |
3113 | rcu_read_lock(); | |
9a0762c5 | 3114 | list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) { |
498e5f24 | 3115 | ext4_lblk_t pa_end; |
c9de560d | 3116 | |
c9de560d AT |
3117 | if (pa->pa_deleted) |
3118 | continue; | |
3119 | spin_lock(&pa->pa_lock); | |
3120 | if (pa->pa_deleted) { | |
3121 | spin_unlock(&pa->pa_lock); | |
3122 | continue; | |
3123 | } | |
3124 | ||
53accfa9 TT |
3125 | pa_end = pa->pa_lstart + EXT4_C2B(EXT4_SB(ac->ac_sb), |
3126 | pa->pa_len); | |
c9de560d AT |
3127 | |
3128 | /* PA must not overlap original request */ | |
3129 | BUG_ON(!(ac->ac_o_ex.fe_logical >= pa_end || | |
3130 | ac->ac_o_ex.fe_logical < pa->pa_lstart)); | |
3131 | ||
38877f4e ES |
3132 | /* skip PAs this normalized request doesn't overlap with */ |
3133 | if (pa->pa_lstart >= end || pa_end <= start) { | |
c9de560d AT |
3134 | spin_unlock(&pa->pa_lock); |
3135 | continue; | |
3136 | } | |
3137 | BUG_ON(pa->pa_lstart <= start && pa_end >= end); | |
3138 | ||
38877f4e | 3139 | /* adjust start or end to be adjacent to this pa */ |
c9de560d AT |
3140 | if (pa_end <= ac->ac_o_ex.fe_logical) { |
3141 | BUG_ON(pa_end < start); | |
3142 | start = pa_end; | |
38877f4e | 3143 | } else if (pa->pa_lstart > ac->ac_o_ex.fe_logical) { |
c9de560d AT |
3144 | BUG_ON(pa->pa_lstart > end); |
3145 | end = pa->pa_lstart; | |
3146 | } | |
3147 | spin_unlock(&pa->pa_lock); | |
3148 | } | |
3149 | rcu_read_unlock(); | |
3150 | size = end - start; | |
3151 | ||
3152 | /* XXX: extra loop to check we really don't overlap preallocations */ | |
3153 | rcu_read_lock(); | |
9a0762c5 | 3154 | list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) { |
498e5f24 | 3155 | ext4_lblk_t pa_end; |
53accfa9 | 3156 | |
c9de560d AT |
3157 | spin_lock(&pa->pa_lock); |
3158 | if (pa->pa_deleted == 0) { | |
53accfa9 TT |
3159 | pa_end = pa->pa_lstart + EXT4_C2B(EXT4_SB(ac->ac_sb), |
3160 | pa->pa_len); | |
c9de560d AT |
3161 | BUG_ON(!(start >= pa_end || end <= pa->pa_lstart)); |
3162 | } | |
3163 | spin_unlock(&pa->pa_lock); | |
3164 | } | |
3165 | rcu_read_unlock(); | |
3166 | ||
3167 | if (start + size <= ac->ac_o_ex.fe_logical && | |
3168 | start > ac->ac_o_ex.fe_logical) { | |
9d8b9ec4 TT |
3169 | ext4_msg(ac->ac_sb, KERN_ERR, |
3170 | "start %lu, size %lu, fe_logical %lu", | |
3171 | (unsigned long) start, (unsigned long) size, | |
3172 | (unsigned long) ac->ac_o_ex.fe_logical); | |
dfe076c1 | 3173 | BUG(); |
c9de560d | 3174 | } |
b5b60778 | 3175 | BUG_ON(size <= 0 || size > EXT4_BLOCKS_PER_GROUP(ac->ac_sb)); |
c9de560d AT |
3176 | |
3177 | /* now prepare goal request */ | |
3178 | ||
3179 | /* XXX: is it better to align blocks WRT to logical | |
3180 | * placement or satisfy big request as is */ | |
3181 | ac->ac_g_ex.fe_logical = start; | |
53accfa9 | 3182 | ac->ac_g_ex.fe_len = EXT4_NUM_B2C(sbi, size); |
c9de560d AT |
3183 | |
3184 | /* define goal start in order to merge */ | |
3185 | if (ar->pright && (ar->lright == (start + size))) { | |
3186 | /* merge to the right */ | |
3187 | ext4_get_group_no_and_offset(ac->ac_sb, ar->pright - size, | |
3188 | &ac->ac_f_ex.fe_group, | |
3189 | &ac->ac_f_ex.fe_start); | |
3190 | ac->ac_flags |= EXT4_MB_HINT_TRY_GOAL; | |
3191 | } | |
3192 | if (ar->pleft && (ar->lleft + 1 == start)) { | |
3193 | /* merge to the left */ | |
3194 | ext4_get_group_no_and_offset(ac->ac_sb, ar->pleft + 1, | |
3195 | &ac->ac_f_ex.fe_group, | |
3196 | &ac->ac_f_ex.fe_start); | |
3197 | ac->ac_flags |= EXT4_MB_HINT_TRY_GOAL; | |
3198 | } | |
3199 | ||
6ba495e9 | 3200 | mb_debug(1, "goal: %u(was %u) blocks at %u\n", (unsigned) size, |
c9de560d AT |
3201 | (unsigned) orig_size, (unsigned) start); |
3202 | } | |
3203 | ||
3204 | static void ext4_mb_collect_stats(struct ext4_allocation_context *ac) | |
3205 | { | |
3206 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); | |
3207 | ||
3208 | if (sbi->s_mb_stats && ac->ac_g_ex.fe_len > 1) { | |
3209 | atomic_inc(&sbi->s_bal_reqs); | |
3210 | atomic_add(ac->ac_b_ex.fe_len, &sbi->s_bal_allocated); | |
291dae47 | 3211 | if (ac->ac_b_ex.fe_len >= ac->ac_o_ex.fe_len) |
c9de560d AT |
3212 | atomic_inc(&sbi->s_bal_success); |
3213 | atomic_add(ac->ac_found, &sbi->s_bal_ex_scanned); | |
3214 | if (ac->ac_g_ex.fe_start == ac->ac_b_ex.fe_start && | |
3215 | ac->ac_g_ex.fe_group == ac->ac_b_ex.fe_group) | |
3216 | atomic_inc(&sbi->s_bal_goals); | |
3217 | if (ac->ac_found > sbi->s_mb_max_to_scan) | |
3218 | atomic_inc(&sbi->s_bal_breaks); | |
3219 | } | |
3220 | ||
296c355c TT |
3221 | if (ac->ac_op == EXT4_MB_HISTORY_ALLOC) |
3222 | trace_ext4_mballoc_alloc(ac); | |
3223 | else | |
3224 | trace_ext4_mballoc_prealloc(ac); | |
c9de560d AT |
3225 | } |
3226 | ||
b844167e CW |
3227 | /* |
3228 | * Called on failure; free up any blocks from the inode PA for this | |
3229 | * context. We don't need this for MB_GROUP_PA because we only change | |
3230 | * pa_free in ext4_mb_release_context(), but on failure, we've already | |
3231 | * zeroed out ac->ac_b_ex.fe_len, so group_pa->pa_free is not changed. | |
3232 | */ | |
3233 | static void ext4_discard_allocated_blocks(struct ext4_allocation_context *ac) | |
3234 | { | |
3235 | struct ext4_prealloc_space *pa = ac->ac_pa; | |
86f0afd4 TT |
3236 | struct ext4_buddy e4b; |
3237 | int err; | |
b844167e | 3238 | |
86f0afd4 | 3239 | if (pa == NULL) { |
c99d1e6e TT |
3240 | if (ac->ac_f_ex.fe_len == 0) |
3241 | return; | |
86f0afd4 TT |
3242 | err = ext4_mb_load_buddy(ac->ac_sb, ac->ac_f_ex.fe_group, &e4b); |
3243 | if (err) { | |
3244 | /* | |
3245 | * This should never happen since we pin the | |
3246 | * pages in the ext4_allocation_context so | |
3247 | * ext4_mb_load_buddy() should never fail. | |
3248 | */ | |
3249 | WARN(1, "mb_load_buddy failed (%d)", err); | |
3250 | return; | |
3251 | } | |
3252 | ext4_lock_group(ac->ac_sb, ac->ac_f_ex.fe_group); | |
3253 | mb_free_blocks(ac->ac_inode, &e4b, ac->ac_f_ex.fe_start, | |
3254 | ac->ac_f_ex.fe_len); | |
3255 | ext4_unlock_group(ac->ac_sb, ac->ac_f_ex.fe_group); | |
c99d1e6e | 3256 | ext4_mb_unload_buddy(&e4b); |
86f0afd4 TT |
3257 | return; |
3258 | } | |
3259 | if (pa->pa_type == MB_INODE_PA) | |
400db9d3 | 3260 | pa->pa_free += ac->ac_b_ex.fe_len; |
b844167e CW |
3261 | } |
3262 | ||
c9de560d AT |
3263 | /* |
3264 | * use blocks preallocated to inode | |
3265 | */ | |
3266 | static void ext4_mb_use_inode_pa(struct ext4_allocation_context *ac, | |
3267 | struct ext4_prealloc_space *pa) | |
3268 | { | |
53accfa9 | 3269 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); |
c9de560d AT |
3270 | ext4_fsblk_t start; |
3271 | ext4_fsblk_t end; | |
3272 | int len; | |
3273 | ||
3274 | /* found preallocated blocks, use them */ | |
3275 | start = pa->pa_pstart + (ac->ac_o_ex.fe_logical - pa->pa_lstart); | |
53accfa9 TT |
3276 | end = min(pa->pa_pstart + EXT4_C2B(sbi, pa->pa_len), |
3277 | start + EXT4_C2B(sbi, ac->ac_o_ex.fe_len)); | |
3278 | len = EXT4_NUM_B2C(sbi, end - start); | |
c9de560d AT |
3279 | ext4_get_group_no_and_offset(ac->ac_sb, start, &ac->ac_b_ex.fe_group, |
3280 | &ac->ac_b_ex.fe_start); | |
3281 | ac->ac_b_ex.fe_len = len; | |
3282 | ac->ac_status = AC_STATUS_FOUND; | |
3283 | ac->ac_pa = pa; | |
3284 | ||
3285 | BUG_ON(start < pa->pa_pstart); | |
53accfa9 | 3286 | BUG_ON(end > pa->pa_pstart + EXT4_C2B(sbi, pa->pa_len)); |
c9de560d AT |
3287 | BUG_ON(pa->pa_free < len); |
3288 | pa->pa_free -= len; | |
3289 | ||
6ba495e9 | 3290 | mb_debug(1, "use %llu/%u from inode pa %p\n", start, len, pa); |
c9de560d AT |
3291 | } |
3292 | ||
3293 | /* | |
3294 | * use blocks preallocated to locality group | |
3295 | */ | |
3296 | static void ext4_mb_use_group_pa(struct ext4_allocation_context *ac, | |
3297 | struct ext4_prealloc_space *pa) | |
3298 | { | |
03cddb80 | 3299 | unsigned int len = ac->ac_o_ex.fe_len; |
6be2ded1 | 3300 | |
c9de560d AT |
3301 | ext4_get_group_no_and_offset(ac->ac_sb, pa->pa_pstart, |
3302 | &ac->ac_b_ex.fe_group, | |
3303 | &ac->ac_b_ex.fe_start); | |
3304 | ac->ac_b_ex.fe_len = len; | |
3305 | ac->ac_status = AC_STATUS_FOUND; | |
3306 | ac->ac_pa = pa; | |
3307 | ||
3308 | /* we don't correct pa_pstart or pa_plen here to avoid | |
26346ff6 | 3309 | * possible race when the group is being loaded concurrently |
c9de560d | 3310 | * instead we correct pa later, after blocks are marked |
26346ff6 AK |
3311 | * in on-disk bitmap -- see ext4_mb_release_context() |
3312 | * Other CPUs are prevented from allocating from this pa by lg_mutex | |
c9de560d | 3313 | */ |
6ba495e9 | 3314 | mb_debug(1, "use %u/%u from group pa %p\n", pa->pa_lstart-len, len, pa); |
c9de560d AT |
3315 | } |
3316 | ||
5e745b04 AK |
3317 | /* |
3318 | * Return the prealloc space that have minimal distance | |
3319 | * from the goal block. @cpa is the prealloc | |
3320 | * space that is having currently known minimal distance | |
3321 | * from the goal block. | |
3322 | */ | |
3323 | static struct ext4_prealloc_space * | |
3324 | ext4_mb_check_group_pa(ext4_fsblk_t goal_block, | |
3325 | struct ext4_prealloc_space *pa, | |
3326 | struct ext4_prealloc_space *cpa) | |
3327 | { | |
3328 | ext4_fsblk_t cur_distance, new_distance; | |
3329 | ||
3330 | if (cpa == NULL) { | |
3331 | atomic_inc(&pa->pa_count); | |
3332 | return pa; | |
3333 | } | |
3334 | cur_distance = abs(goal_block - cpa->pa_pstart); | |
3335 | new_distance = abs(goal_block - pa->pa_pstart); | |
3336 | ||
5a54b2f1 | 3337 | if (cur_distance <= new_distance) |
5e745b04 AK |
3338 | return cpa; |
3339 | ||
3340 | /* drop the previous reference */ | |
3341 | atomic_dec(&cpa->pa_count); | |
3342 | atomic_inc(&pa->pa_count); | |
3343 | return pa; | |
3344 | } | |
3345 | ||
c9de560d AT |
3346 | /* |
3347 | * search goal blocks in preallocated space | |
3348 | */ | |
4ddfef7b ES |
3349 | static noinline_for_stack int |
3350 | ext4_mb_use_preallocated(struct ext4_allocation_context *ac) | |
c9de560d | 3351 | { |
53accfa9 | 3352 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); |
6be2ded1 | 3353 | int order, i; |
c9de560d AT |
3354 | struct ext4_inode_info *ei = EXT4_I(ac->ac_inode); |
3355 | struct ext4_locality_group *lg; | |
5e745b04 AK |
3356 | struct ext4_prealloc_space *pa, *cpa = NULL; |
3357 | ext4_fsblk_t goal_block; | |
c9de560d AT |
3358 | |
3359 | /* only data can be preallocated */ | |
3360 | if (!(ac->ac_flags & EXT4_MB_HINT_DATA)) | |
3361 | return 0; | |
3362 | ||
3363 | /* first, try per-file preallocation */ | |
3364 | rcu_read_lock(); | |
9a0762c5 | 3365 | list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) { |
c9de560d AT |
3366 | |
3367 | /* all fields in this condition don't change, | |
3368 | * so we can skip locking for them */ | |
3369 | if (ac->ac_o_ex.fe_logical < pa->pa_lstart || | |
53accfa9 TT |
3370 | ac->ac_o_ex.fe_logical >= (pa->pa_lstart + |
3371 | EXT4_C2B(sbi, pa->pa_len))) | |
c9de560d AT |
3372 | continue; |
3373 | ||
fb0a387d | 3374 | /* non-extent files can't have physical blocks past 2^32 */ |
12e9b892 | 3375 | if (!(ext4_test_inode_flag(ac->ac_inode, EXT4_INODE_EXTENTS)) && |
53accfa9 TT |
3376 | (pa->pa_pstart + EXT4_C2B(sbi, pa->pa_len) > |
3377 | EXT4_MAX_BLOCK_FILE_PHYS)) | |
fb0a387d ES |
3378 | continue; |
3379 | ||
c9de560d AT |
3380 | /* found preallocated blocks, use them */ |
3381 | spin_lock(&pa->pa_lock); | |
3382 | if (pa->pa_deleted == 0 && pa->pa_free) { | |
3383 | atomic_inc(&pa->pa_count); | |
3384 | ext4_mb_use_inode_pa(ac, pa); | |
3385 | spin_unlock(&pa->pa_lock); | |
3386 | ac->ac_criteria = 10; | |
3387 | rcu_read_unlock(); | |
3388 | return 1; | |
3389 | } | |
3390 | spin_unlock(&pa->pa_lock); | |
3391 | } | |
3392 | rcu_read_unlock(); | |
3393 | ||
3394 | /* can we use group allocation? */ | |
3395 | if (!(ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC)) | |
3396 | return 0; | |
3397 | ||
3398 | /* inode may have no locality group for some reason */ | |
3399 | lg = ac->ac_lg; | |
3400 | if (lg == NULL) | |
3401 | return 0; | |
6be2ded1 AK |
3402 | order = fls(ac->ac_o_ex.fe_len) - 1; |
3403 | if (order > PREALLOC_TB_SIZE - 1) | |
3404 | /* The max size of hash table is PREALLOC_TB_SIZE */ | |
3405 | order = PREALLOC_TB_SIZE - 1; | |
3406 | ||
bda00de7 | 3407 | goal_block = ext4_grp_offs_to_block(ac->ac_sb, &ac->ac_g_ex); |
5e745b04 AK |
3408 | /* |
3409 | * search for the prealloc space that is having | |
3410 | * minimal distance from the goal block. | |
3411 | */ | |
6be2ded1 AK |
3412 | for (i = order; i < PREALLOC_TB_SIZE; i++) { |
3413 | rcu_read_lock(); | |
3414 | list_for_each_entry_rcu(pa, &lg->lg_prealloc_list[i], | |
3415 | pa_inode_list) { | |
3416 | spin_lock(&pa->pa_lock); | |
3417 | if (pa->pa_deleted == 0 && | |
3418 | pa->pa_free >= ac->ac_o_ex.fe_len) { | |
5e745b04 AK |
3419 | |
3420 | cpa = ext4_mb_check_group_pa(goal_block, | |
3421 | pa, cpa); | |
6be2ded1 | 3422 | } |
c9de560d | 3423 | spin_unlock(&pa->pa_lock); |
c9de560d | 3424 | } |
6be2ded1 | 3425 | rcu_read_unlock(); |
c9de560d | 3426 | } |
5e745b04 AK |
3427 | if (cpa) { |
3428 | ext4_mb_use_group_pa(ac, cpa); | |
3429 | ac->ac_criteria = 20; | |
3430 | return 1; | |
3431 | } | |
c9de560d AT |
3432 | return 0; |
3433 | } | |
3434 | ||
7a2fcbf7 AK |
3435 | /* |
3436 | * the function goes through all block freed in the group | |
3437 | * but not yet committed and marks them used in in-core bitmap. | |
3438 | * buddy must be generated from this bitmap | |
955ce5f5 | 3439 | * Need to be called with the ext4 group lock held |
7a2fcbf7 AK |
3440 | */ |
3441 | static void ext4_mb_generate_from_freelist(struct super_block *sb, void *bitmap, | |
3442 | ext4_group_t group) | |
3443 | { | |
3444 | struct rb_node *n; | |
3445 | struct ext4_group_info *grp; | |
3446 | struct ext4_free_data *entry; | |
3447 | ||
3448 | grp = ext4_get_group_info(sb, group); | |
3449 | n = rb_first(&(grp->bb_free_root)); | |
3450 | ||
3451 | while (n) { | |
18aadd47 BJ |
3452 | entry = rb_entry(n, struct ext4_free_data, efd_node); |
3453 | ext4_set_bits(bitmap, entry->efd_start_cluster, entry->efd_count); | |
7a2fcbf7 AK |
3454 | n = rb_next(n); |
3455 | } | |
3456 | return; | |
3457 | } | |
3458 | ||
c9de560d AT |
3459 | /* |
3460 | * the function goes through all preallocation in this group and marks them | |
3461 | * used in in-core bitmap. buddy must be generated from this bitmap | |
955ce5f5 | 3462 | * Need to be called with ext4 group lock held |
c9de560d | 3463 | */ |
089ceecc ES |
3464 | static noinline_for_stack |
3465 | void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap, | |
c9de560d AT |
3466 | ext4_group_t group) |
3467 | { | |
3468 | struct ext4_group_info *grp = ext4_get_group_info(sb, group); | |
3469 | struct ext4_prealloc_space *pa; | |
3470 | struct list_head *cur; | |
3471 | ext4_group_t groupnr; | |
3472 | ext4_grpblk_t start; | |
3473 | int preallocated = 0; | |
c9de560d AT |
3474 | int len; |
3475 | ||
3476 | /* all form of preallocation discards first load group, | |
3477 | * so the only competing code is preallocation use. | |
3478 | * we don't need any locking here | |
3479 | * notice we do NOT ignore preallocations with pa_deleted | |
3480 | * otherwise we could leave used blocks available for | |
3481 | * allocation in buddy when concurrent ext4_mb_put_pa() | |
3482 | * is dropping preallocation | |
3483 | */ | |
3484 | list_for_each(cur, &grp->bb_prealloc_list) { | |
3485 | pa = list_entry(cur, struct ext4_prealloc_space, pa_group_list); | |
3486 | spin_lock(&pa->pa_lock); | |
3487 | ext4_get_group_no_and_offset(sb, pa->pa_pstart, | |
3488 | &groupnr, &start); | |
3489 | len = pa->pa_len; | |
3490 | spin_unlock(&pa->pa_lock); | |
3491 | if (unlikely(len == 0)) | |
3492 | continue; | |
3493 | BUG_ON(groupnr != group); | |
c3e94d1d | 3494 | ext4_set_bits(bitmap, start, len); |
c9de560d | 3495 | preallocated += len; |
c9de560d | 3496 | } |
6ba495e9 | 3497 | mb_debug(1, "prellocated %u for group %u\n", preallocated, group); |
c9de560d AT |
3498 | } |
3499 | ||
3500 | static void ext4_mb_pa_callback(struct rcu_head *head) | |
3501 | { | |
3502 | struct ext4_prealloc_space *pa; | |
3503 | pa = container_of(head, struct ext4_prealloc_space, u.pa_rcu); | |
4e8d2139 JR |
3504 | |
3505 | BUG_ON(atomic_read(&pa->pa_count)); | |
3506 | BUG_ON(pa->pa_deleted == 0); | |
c9de560d AT |
3507 | kmem_cache_free(ext4_pspace_cachep, pa); |
3508 | } | |
3509 | ||
3510 | /* | |
3511 | * drops a reference to preallocated space descriptor | |
3512 | * if this was the last reference and the space is consumed | |
3513 | */ | |
3514 | static void ext4_mb_put_pa(struct ext4_allocation_context *ac, | |
3515 | struct super_block *sb, struct ext4_prealloc_space *pa) | |
3516 | { | |
a9df9a49 | 3517 | ext4_group_t grp; |
d33a1976 | 3518 | ext4_fsblk_t grp_blk; |
c9de560d | 3519 | |
c9de560d AT |
3520 | /* in this short window concurrent discard can set pa_deleted */ |
3521 | spin_lock(&pa->pa_lock); | |
4e8d2139 JR |
3522 | if (!atomic_dec_and_test(&pa->pa_count) || pa->pa_free != 0) { |
3523 | spin_unlock(&pa->pa_lock); | |
3524 | return; | |
3525 | } | |
3526 | ||
c9de560d AT |
3527 | if (pa->pa_deleted == 1) { |
3528 | spin_unlock(&pa->pa_lock); | |
3529 | return; | |
3530 | } | |
3531 | ||
3532 | pa->pa_deleted = 1; | |
3533 | spin_unlock(&pa->pa_lock); | |
3534 | ||
d33a1976 | 3535 | grp_blk = pa->pa_pstart; |
60e6679e | 3536 | /* |
cc0fb9ad AK |
3537 | * If doing group-based preallocation, pa_pstart may be in the |
3538 | * next group when pa is used up | |
3539 | */ | |
3540 | if (pa->pa_type == MB_GROUP_PA) | |
d33a1976 ES |
3541 | grp_blk--; |
3542 | ||
bd86298e | 3543 | grp = ext4_get_group_number(sb, grp_blk); |
c9de560d AT |
3544 | |
3545 | /* | |
3546 | * possible race: | |
3547 | * | |
3548 | * P1 (buddy init) P2 (regular allocation) | |
3549 | * find block B in PA | |
3550 | * copy on-disk bitmap to buddy | |
3551 | * mark B in on-disk bitmap | |
3552 | * drop PA from group | |
3553 | * mark all PAs in buddy | |
3554 | * | |
3555 | * thus, P1 initializes buddy with B available. to prevent this | |
3556 | * we make "copy" and "mark all PAs" atomic and serialize "drop PA" | |
3557 | * against that pair | |
3558 | */ | |
3559 | ext4_lock_group(sb, grp); | |
3560 | list_del(&pa->pa_group_list); | |
3561 | ext4_unlock_group(sb, grp); | |
3562 | ||
3563 | spin_lock(pa->pa_obj_lock); | |
3564 | list_del_rcu(&pa->pa_inode_list); | |
3565 | spin_unlock(pa->pa_obj_lock); | |
3566 | ||
3567 | call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback); | |
3568 | } | |
3569 | ||
3570 | /* | |
3571 | * creates new preallocated space for given inode | |
3572 | */ | |
4ddfef7b ES |
3573 | static noinline_for_stack int |
3574 | ext4_mb_new_inode_pa(struct ext4_allocation_context *ac) | |
c9de560d AT |
3575 | { |
3576 | struct super_block *sb = ac->ac_sb; | |
53accfa9 | 3577 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
c9de560d AT |
3578 | struct ext4_prealloc_space *pa; |
3579 | struct ext4_group_info *grp; | |
3580 | struct ext4_inode_info *ei; | |
3581 | ||
3582 | /* preallocate only when found space is larger then requested */ | |
3583 | BUG_ON(ac->ac_o_ex.fe_len >= ac->ac_b_ex.fe_len); | |
3584 | BUG_ON(ac->ac_status != AC_STATUS_FOUND); | |
3585 | BUG_ON(!S_ISREG(ac->ac_inode->i_mode)); | |
3586 | ||
3587 | pa = kmem_cache_alloc(ext4_pspace_cachep, GFP_NOFS); | |
3588 | if (pa == NULL) | |
3589 | return -ENOMEM; | |
3590 | ||
3591 | if (ac->ac_b_ex.fe_len < ac->ac_g_ex.fe_len) { | |
3592 | int winl; | |
3593 | int wins; | |
3594 | int win; | |
3595 | int offs; | |
3596 | ||
3597 | /* we can't allocate as much as normalizer wants. | |
3598 | * so, found space must get proper lstart | |
3599 | * to cover original request */ | |
3600 | BUG_ON(ac->ac_g_ex.fe_logical > ac->ac_o_ex.fe_logical); | |
3601 | BUG_ON(ac->ac_g_ex.fe_len < ac->ac_o_ex.fe_len); | |
3602 | ||
3603 | /* we're limited by original request in that | |
3604 | * logical block must be covered any way | |
3605 | * winl is window we can move our chunk within */ | |
3606 | winl = ac->ac_o_ex.fe_logical - ac->ac_g_ex.fe_logical; | |
3607 | ||
3608 | /* also, we should cover whole original request */ | |
53accfa9 | 3609 | wins = EXT4_C2B(sbi, ac->ac_b_ex.fe_len - ac->ac_o_ex.fe_len); |
c9de560d AT |
3610 | |
3611 | /* the smallest one defines real window */ | |
3612 | win = min(winl, wins); | |
3613 | ||
53accfa9 TT |
3614 | offs = ac->ac_o_ex.fe_logical % |
3615 | EXT4_C2B(sbi, ac->ac_b_ex.fe_len); | |
c9de560d AT |
3616 | if (offs && offs < win) |
3617 | win = offs; | |
3618 | ||
53accfa9 | 3619 | ac->ac_b_ex.fe_logical = ac->ac_o_ex.fe_logical - |
810da240 | 3620 | EXT4_NUM_B2C(sbi, win); |
c9de560d AT |
3621 | BUG_ON(ac->ac_o_ex.fe_logical < ac->ac_b_ex.fe_logical); |
3622 | BUG_ON(ac->ac_o_ex.fe_len > ac->ac_b_ex.fe_len); | |
3623 | } | |
3624 | ||
3625 | /* preallocation can change ac_b_ex, thus we store actually | |
3626 | * allocated blocks for history */ | |
3627 | ac->ac_f_ex = ac->ac_b_ex; | |
3628 | ||
3629 | pa->pa_lstart = ac->ac_b_ex.fe_logical; | |
3630 | pa->pa_pstart = ext4_grp_offs_to_block(sb, &ac->ac_b_ex); | |
3631 | pa->pa_len = ac->ac_b_ex.fe_len; | |
3632 | pa->pa_free = pa->pa_len; | |
3633 | atomic_set(&pa->pa_count, 1); | |
3634 | spin_lock_init(&pa->pa_lock); | |
d794bf8e AK |
3635 | INIT_LIST_HEAD(&pa->pa_inode_list); |
3636 | INIT_LIST_HEAD(&pa->pa_group_list); | |
c9de560d | 3637 | pa->pa_deleted = 0; |
cc0fb9ad | 3638 | pa->pa_type = MB_INODE_PA; |
c9de560d | 3639 | |
6ba495e9 | 3640 | mb_debug(1, "new inode pa %p: %llu/%u for %u\n", pa, |
c9de560d | 3641 | pa->pa_pstart, pa->pa_len, pa->pa_lstart); |
9bffad1e | 3642 | trace_ext4_mb_new_inode_pa(ac, pa); |
c9de560d AT |
3643 | |
3644 | ext4_mb_use_inode_pa(ac, pa); | |
53accfa9 | 3645 | atomic_add(pa->pa_free, &sbi->s_mb_preallocated); |
c9de560d AT |
3646 | |
3647 | ei = EXT4_I(ac->ac_inode); | |
3648 | grp = ext4_get_group_info(sb, ac->ac_b_ex.fe_group); | |
3649 | ||
3650 | pa->pa_obj_lock = &ei->i_prealloc_lock; | |
3651 | pa->pa_inode = ac->ac_inode; | |
3652 | ||
3653 | ext4_lock_group(sb, ac->ac_b_ex.fe_group); | |
3654 | list_add(&pa->pa_group_list, &grp->bb_prealloc_list); | |
3655 | ext4_unlock_group(sb, ac->ac_b_ex.fe_group); | |
3656 | ||
3657 | spin_lock(pa->pa_obj_lock); | |
3658 | list_add_rcu(&pa->pa_inode_list, &ei->i_prealloc_list); | |
3659 | spin_unlock(pa->pa_obj_lock); | |
3660 | ||
3661 | return 0; | |
3662 | } | |
3663 | ||
3664 | /* | |
3665 | * creates new preallocated space for locality group inodes belongs to | |
3666 | */ | |
4ddfef7b ES |
3667 | static noinline_for_stack int |
3668 | ext4_mb_new_group_pa(struct ext4_allocation_context *ac) | |
c9de560d AT |
3669 | { |
3670 | struct super_block *sb = ac->ac_sb; | |
3671 | struct ext4_locality_group *lg; | |
3672 | struct ext4_prealloc_space *pa; | |
3673 | struct ext4_group_info *grp; | |
3674 | ||
3675 | /* preallocate only when found space is larger then requested */ | |
3676 | BUG_ON(ac->ac_o_ex.fe_len >= ac->ac_b_ex.fe_len); | |
3677 | BUG_ON(ac->ac_status != AC_STATUS_FOUND); | |
3678 | BUG_ON(!S_ISREG(ac->ac_inode->i_mode)); | |
3679 | ||
3680 | BUG_ON(ext4_pspace_cachep == NULL); | |
3681 | pa = kmem_cache_alloc(ext4_pspace_cachep, GFP_NOFS); | |
3682 | if (pa == NULL) | |
3683 | return -ENOMEM; | |
3684 | ||
3685 | /* preallocation can change ac_b_ex, thus we store actually | |
3686 | * allocated blocks for history */ | |
3687 | ac->ac_f_ex = ac->ac_b_ex; | |
3688 | ||
3689 | pa->pa_pstart = ext4_grp_offs_to_block(sb, &ac->ac_b_ex); | |
3690 | pa->pa_lstart = pa->pa_pstart; | |
3691 | pa->pa_len = ac->ac_b_ex.fe_len; | |
3692 | pa->pa_free = pa->pa_len; | |
3693 | atomic_set(&pa->pa_count, 1); | |
3694 | spin_lock_init(&pa->pa_lock); | |
6be2ded1 | 3695 | INIT_LIST_HEAD(&pa->pa_inode_list); |
d794bf8e | 3696 | INIT_LIST_HEAD(&pa->pa_group_list); |
c9de560d | 3697 | pa->pa_deleted = 0; |
cc0fb9ad | 3698 | pa->pa_type = MB_GROUP_PA; |
c9de560d | 3699 | |
6ba495e9 | 3700 | mb_debug(1, "new group pa %p: %llu/%u for %u\n", pa, |
9bffad1e TT |
3701 | pa->pa_pstart, pa->pa_len, pa->pa_lstart); |
3702 | trace_ext4_mb_new_group_pa(ac, pa); | |
c9de560d AT |
3703 | |
3704 | ext4_mb_use_group_pa(ac, pa); | |
3705 | atomic_add(pa->pa_free, &EXT4_SB(sb)->s_mb_preallocated); | |
3706 | ||
3707 | grp = ext4_get_group_info(sb, ac->ac_b_ex.fe_group); | |
3708 | lg = ac->ac_lg; | |
3709 | BUG_ON(lg == NULL); | |
3710 | ||
3711 | pa->pa_obj_lock = &lg->lg_prealloc_lock; | |
3712 | pa->pa_inode = NULL; | |
3713 | ||
3714 | ext4_lock_group(sb, ac->ac_b_ex.fe_group); | |
3715 | list_add(&pa->pa_group_list, &grp->bb_prealloc_list); | |
3716 | ext4_unlock_group(sb, ac->ac_b_ex.fe_group); | |
3717 | ||
6be2ded1 AK |
3718 | /* |
3719 | * We will later add the new pa to the right bucket | |
3720 | * after updating the pa_free in ext4_mb_release_context | |
3721 | */ | |
c9de560d AT |
3722 | return 0; |
3723 | } | |
3724 | ||
3725 | static int ext4_mb_new_preallocation(struct ext4_allocation_context *ac) | |
3726 | { | |
3727 | int err; | |
3728 | ||
3729 | if (ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC) | |
3730 | err = ext4_mb_new_group_pa(ac); | |
3731 | else | |
3732 | err = ext4_mb_new_inode_pa(ac); | |
3733 | return err; | |
3734 | } | |
3735 | ||
3736 | /* | |
3737 | * finds all unused blocks in on-disk bitmap, frees them in | |
3738 | * in-core bitmap and buddy. | |
3739 | * @pa must be unlinked from inode and group lists, so that | |
3740 | * nobody else can find/use it. | |
3741 | * the caller MUST hold group/inode locks. | |
3742 | * TODO: optimize the case when there are no in-core structures yet | |
3743 | */ | |
4ddfef7b ES |
3744 | static noinline_for_stack int |
3745 | ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh, | |
3e1e5f50 | 3746 | struct ext4_prealloc_space *pa) |
c9de560d | 3747 | { |
c9de560d AT |
3748 | struct super_block *sb = e4b->bd_sb; |
3749 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
498e5f24 TT |
3750 | unsigned int end; |
3751 | unsigned int next; | |
c9de560d AT |
3752 | ext4_group_t group; |
3753 | ext4_grpblk_t bit; | |
ba80b101 | 3754 | unsigned long long grp_blk_start; |
c9de560d AT |
3755 | int err = 0; |
3756 | int free = 0; | |
3757 | ||
3758 | BUG_ON(pa->pa_deleted == 0); | |
3759 | ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit); | |
53accfa9 | 3760 | grp_blk_start = pa->pa_pstart - EXT4_C2B(sbi, bit); |
c9de560d AT |
3761 | BUG_ON(group != e4b->bd_group && pa->pa_len != 0); |
3762 | end = bit + pa->pa_len; | |
3763 | ||
c9de560d | 3764 | while (bit < end) { |
ffad0a44 | 3765 | bit = mb_find_next_zero_bit(bitmap_bh->b_data, end, bit); |
c9de560d AT |
3766 | if (bit >= end) |
3767 | break; | |
ffad0a44 | 3768 | next = mb_find_next_bit(bitmap_bh->b_data, end, bit); |
6ba495e9 | 3769 | mb_debug(1, " free preallocated %u/%u in group %u\n", |
5a0790c2 AK |
3770 | (unsigned) ext4_group_first_block_no(sb, group) + bit, |
3771 | (unsigned) next - bit, (unsigned) group); | |
c9de560d AT |
3772 | free += next - bit; |
3773 | ||
3e1e5f50 | 3774 | trace_ext4_mballoc_discard(sb, NULL, group, bit, next - bit); |
53accfa9 TT |
3775 | trace_ext4_mb_release_inode_pa(pa, (grp_blk_start + |
3776 | EXT4_C2B(sbi, bit)), | |
a9c667f8 | 3777 | next - bit); |
c9de560d AT |
3778 | mb_free_blocks(pa->pa_inode, e4b, bit, next - bit); |
3779 | bit = next + 1; | |
3780 | } | |
3781 | if (free != pa->pa_free) { | |
9d8b9ec4 TT |
3782 | ext4_msg(e4b->bd_sb, KERN_CRIT, |
3783 | "pa %p: logic %lu, phys. %lu, len %lu", | |
3784 | pa, (unsigned long) pa->pa_lstart, | |
3785 | (unsigned long) pa->pa_pstart, | |
3786 | (unsigned long) pa->pa_len); | |
e29136f8 | 3787 | ext4_grp_locked_error(sb, group, 0, 0, "free %u, pa_free %u", |
5d1b1b3f | 3788 | free, pa->pa_free); |
e56eb659 AK |
3789 | /* |
3790 | * pa is already deleted so we use the value obtained | |
3791 | * from the bitmap and continue. | |
3792 | */ | |
c9de560d | 3793 | } |
c9de560d AT |
3794 | atomic_add(free, &sbi->s_mb_discarded); |
3795 | ||
3796 | return err; | |
3797 | } | |
3798 | ||
4ddfef7b ES |
3799 | static noinline_for_stack int |
3800 | ext4_mb_release_group_pa(struct ext4_buddy *e4b, | |
3e1e5f50 | 3801 | struct ext4_prealloc_space *pa) |
c9de560d | 3802 | { |
c9de560d AT |
3803 | struct super_block *sb = e4b->bd_sb; |
3804 | ext4_group_t group; | |
3805 | ext4_grpblk_t bit; | |
3806 | ||
60e07cf5 | 3807 | trace_ext4_mb_release_group_pa(sb, pa); |
c9de560d AT |
3808 | BUG_ON(pa->pa_deleted == 0); |
3809 | ext4_get_group_no_and_offset(sb, pa->pa_pstart, &group, &bit); | |
3810 | BUG_ON(group != e4b->bd_group && pa->pa_len != 0); | |
3811 | mb_free_blocks(pa->pa_inode, e4b, bit, pa->pa_len); | |
3812 | atomic_add(pa->pa_len, &EXT4_SB(sb)->s_mb_discarded); | |
3e1e5f50 | 3813 | trace_ext4_mballoc_discard(sb, NULL, group, bit, pa->pa_len); |
c9de560d AT |
3814 | |
3815 | return 0; | |
3816 | } | |
3817 | ||
3818 | /* | |
3819 | * releases all preallocations in given group | |
3820 | * | |
3821 | * first, we need to decide discard policy: | |
3822 | * - when do we discard | |
3823 | * 1) ENOSPC | |
3824 | * - how many do we discard | |
3825 | * 1) how many requested | |
3826 | */ | |
4ddfef7b ES |
3827 | static noinline_for_stack int |
3828 | ext4_mb_discard_group_preallocations(struct super_block *sb, | |
c9de560d AT |
3829 | ext4_group_t group, int needed) |
3830 | { | |
3831 | struct ext4_group_info *grp = ext4_get_group_info(sb, group); | |
3832 | struct buffer_head *bitmap_bh = NULL; | |
3833 | struct ext4_prealloc_space *pa, *tmp; | |
3834 | struct list_head list; | |
3835 | struct ext4_buddy e4b; | |
3836 | int err; | |
3837 | int busy = 0; | |
3838 | int free = 0; | |
3839 | ||
6ba495e9 | 3840 | mb_debug(1, "discard preallocation for group %u\n", group); |
c9de560d AT |
3841 | |
3842 | if (list_empty(&grp->bb_prealloc_list)) | |
3843 | return 0; | |
3844 | ||
574ca174 | 3845 | bitmap_bh = ext4_read_block_bitmap(sb, group); |
c9de560d | 3846 | if (bitmap_bh == NULL) { |
12062ddd | 3847 | ext4_error(sb, "Error reading block bitmap for %u", group); |
ce89f46c | 3848 | return 0; |
c9de560d AT |
3849 | } |
3850 | ||
3851 | err = ext4_mb_load_buddy(sb, group, &e4b); | |
ce89f46c | 3852 | if (err) { |
12062ddd | 3853 | ext4_error(sb, "Error loading buddy information for %u", group); |
ce89f46c AK |
3854 | put_bh(bitmap_bh); |
3855 | return 0; | |
3856 | } | |
c9de560d AT |
3857 | |
3858 | if (needed == 0) | |
7137d7a4 | 3859 | needed = EXT4_CLUSTERS_PER_GROUP(sb) + 1; |
c9de560d | 3860 | |
c9de560d | 3861 | INIT_LIST_HEAD(&list); |
c9de560d AT |
3862 | repeat: |
3863 | ext4_lock_group(sb, group); | |
3864 | list_for_each_entry_safe(pa, tmp, | |
3865 | &grp->bb_prealloc_list, pa_group_list) { | |
3866 | spin_lock(&pa->pa_lock); | |
3867 | if (atomic_read(&pa->pa_count)) { | |
3868 | spin_unlock(&pa->pa_lock); | |
3869 | busy = 1; | |
3870 | continue; | |
3871 | } | |
3872 | if (pa->pa_deleted) { | |
3873 | spin_unlock(&pa->pa_lock); | |
3874 | continue; | |
3875 | } | |
3876 | ||
3877 | /* seems this one can be freed ... */ | |
3878 | pa->pa_deleted = 1; | |
3879 | ||
3880 | /* we can trust pa_free ... */ | |
3881 | free += pa->pa_free; | |
3882 | ||
3883 | spin_unlock(&pa->pa_lock); | |
3884 | ||
3885 | list_del(&pa->pa_group_list); | |
3886 | list_add(&pa->u.pa_tmp_list, &list); | |
3887 | } | |
3888 | ||
3889 | /* if we still need more blocks and some PAs were used, try again */ | |
3890 | if (free < needed && busy) { | |
3891 | busy = 0; | |
3892 | ext4_unlock_group(sb, group); | |
bb8b20ed | 3893 | cond_resched(); |
c9de560d AT |
3894 | goto repeat; |
3895 | } | |
3896 | ||
3897 | /* found anything to free? */ | |
3898 | if (list_empty(&list)) { | |
3899 | BUG_ON(free != 0); | |
3900 | goto out; | |
3901 | } | |
3902 | ||
3903 | /* now free all selected PAs */ | |
3904 | list_for_each_entry_safe(pa, tmp, &list, u.pa_tmp_list) { | |
3905 | ||
3906 | /* remove from object (inode or locality group) */ | |
3907 | spin_lock(pa->pa_obj_lock); | |
3908 | list_del_rcu(&pa->pa_inode_list); | |
3909 | spin_unlock(pa->pa_obj_lock); | |
3910 | ||
cc0fb9ad | 3911 | if (pa->pa_type == MB_GROUP_PA) |
3e1e5f50 | 3912 | ext4_mb_release_group_pa(&e4b, pa); |
c9de560d | 3913 | else |
3e1e5f50 | 3914 | ext4_mb_release_inode_pa(&e4b, bitmap_bh, pa); |
c9de560d AT |
3915 | |
3916 | list_del(&pa->u.pa_tmp_list); | |
3917 | call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback); | |
3918 | } | |
3919 | ||
3920 | out: | |
3921 | ext4_unlock_group(sb, group); | |
e39e07fd | 3922 | ext4_mb_unload_buddy(&e4b); |
c9de560d AT |
3923 | put_bh(bitmap_bh); |
3924 | return free; | |
3925 | } | |
3926 | ||
3927 | /* | |
3928 | * releases all non-used preallocated blocks for given inode | |
3929 | * | |
3930 | * It's important to discard preallocations under i_data_sem | |
3931 | * We don't want another block to be served from the prealloc | |
3932 | * space when we are discarding the inode prealloc space. | |
3933 | * | |
3934 | * FIXME!! Make sure it is valid at all the call sites | |
3935 | */ | |
c2ea3fde | 3936 | void ext4_discard_preallocations(struct inode *inode) |
c9de560d AT |
3937 | { |
3938 | struct ext4_inode_info *ei = EXT4_I(inode); | |
3939 | struct super_block *sb = inode->i_sb; | |
3940 | struct buffer_head *bitmap_bh = NULL; | |
3941 | struct ext4_prealloc_space *pa, *tmp; | |
3942 | ext4_group_t group = 0; | |
3943 | struct list_head list; | |
3944 | struct ext4_buddy e4b; | |
3945 | int err; | |
3946 | ||
c2ea3fde | 3947 | if (!S_ISREG(inode->i_mode)) { |
c9de560d AT |
3948 | /*BUG_ON(!list_empty(&ei->i_prealloc_list));*/ |
3949 | return; | |
3950 | } | |
3951 | ||
6ba495e9 | 3952 | mb_debug(1, "discard preallocation for inode %lu\n", inode->i_ino); |
9bffad1e | 3953 | trace_ext4_discard_preallocations(inode); |
c9de560d AT |
3954 | |
3955 | INIT_LIST_HEAD(&list); | |
3956 | ||
3957 | repeat: | |
3958 | /* first, collect all pa's in the inode */ | |
3959 | spin_lock(&ei->i_prealloc_lock); | |
3960 | while (!list_empty(&ei->i_prealloc_list)) { | |
3961 | pa = list_entry(ei->i_prealloc_list.next, | |
3962 | struct ext4_prealloc_space, pa_inode_list); | |
3963 | BUG_ON(pa->pa_obj_lock != &ei->i_prealloc_lock); | |
3964 | spin_lock(&pa->pa_lock); | |
3965 | if (atomic_read(&pa->pa_count)) { | |
3966 | /* this shouldn't happen often - nobody should | |
3967 | * use preallocation while we're discarding it */ | |
3968 | spin_unlock(&pa->pa_lock); | |
3969 | spin_unlock(&ei->i_prealloc_lock); | |
9d8b9ec4 TT |
3970 | ext4_msg(sb, KERN_ERR, |
3971 | "uh-oh! used pa while discarding"); | |
c9de560d AT |
3972 | WARN_ON(1); |
3973 | schedule_timeout_uninterruptible(HZ); | |
3974 | goto repeat; | |
3975 | ||
3976 | } | |
3977 | if (pa->pa_deleted == 0) { | |
3978 | pa->pa_deleted = 1; | |
3979 | spin_unlock(&pa->pa_lock); | |
3980 | list_del_rcu(&pa->pa_inode_list); | |
3981 | list_add(&pa->u.pa_tmp_list, &list); | |
3982 | continue; | |
3983 | } | |
3984 | ||
3985 | /* someone is deleting pa right now */ | |
3986 | spin_unlock(&pa->pa_lock); | |
3987 | spin_unlock(&ei->i_prealloc_lock); | |
3988 | ||
3989 | /* we have to wait here because pa_deleted | |
3990 | * doesn't mean pa is already unlinked from | |
3991 | * the list. as we might be called from | |
3992 | * ->clear_inode() the inode will get freed | |
3993 | * and concurrent thread which is unlinking | |
3994 | * pa from inode's list may access already | |
3995 | * freed memory, bad-bad-bad */ | |
3996 | ||
3997 | /* XXX: if this happens too often, we can | |
3998 | * add a flag to force wait only in case | |
3999 | * of ->clear_inode(), but not in case of | |
4000 | * regular truncate */ | |
4001 | schedule_timeout_uninterruptible(HZ); | |
4002 | goto repeat; | |
4003 | } | |
4004 | spin_unlock(&ei->i_prealloc_lock); | |
4005 | ||
4006 | list_for_each_entry_safe(pa, tmp, &list, u.pa_tmp_list) { | |
cc0fb9ad | 4007 | BUG_ON(pa->pa_type != MB_INODE_PA); |
bd86298e | 4008 | group = ext4_get_group_number(sb, pa->pa_pstart); |
c9de560d AT |
4009 | |
4010 | err = ext4_mb_load_buddy(sb, group, &e4b); | |
ce89f46c | 4011 | if (err) { |
12062ddd ES |
4012 | ext4_error(sb, "Error loading buddy information for %u", |
4013 | group); | |
ce89f46c AK |
4014 | continue; |
4015 | } | |
c9de560d | 4016 | |
574ca174 | 4017 | bitmap_bh = ext4_read_block_bitmap(sb, group); |
c9de560d | 4018 | if (bitmap_bh == NULL) { |
12062ddd ES |
4019 | ext4_error(sb, "Error reading block bitmap for %u", |
4020 | group); | |
e39e07fd | 4021 | ext4_mb_unload_buddy(&e4b); |
ce89f46c | 4022 | continue; |
c9de560d AT |
4023 | } |
4024 | ||
4025 | ext4_lock_group(sb, group); | |
4026 | list_del(&pa->pa_group_list); | |
3e1e5f50 | 4027 | ext4_mb_release_inode_pa(&e4b, bitmap_bh, pa); |
c9de560d AT |
4028 | ext4_unlock_group(sb, group); |
4029 | ||
e39e07fd | 4030 | ext4_mb_unload_buddy(&e4b); |
c9de560d AT |
4031 | put_bh(bitmap_bh); |
4032 | ||
4033 | list_del(&pa->u.pa_tmp_list); | |
4034 | call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback); | |
4035 | } | |
4036 | } | |
4037 | ||
6ba495e9 | 4038 | #ifdef CONFIG_EXT4_DEBUG |
c9de560d AT |
4039 | static void ext4_mb_show_ac(struct ext4_allocation_context *ac) |
4040 | { | |
4041 | struct super_block *sb = ac->ac_sb; | |
8df9675f | 4042 | ext4_group_t ngroups, i; |
c9de560d | 4043 | |
a0b30c12 | 4044 | if (!ext4_mballoc_debug || |
4dd89fc6 | 4045 | (EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED)) |
e3570639 ES |
4046 | return; |
4047 | ||
7f6a11e7 | 4048 | ext4_msg(ac->ac_sb, KERN_ERR, "Can't allocate:" |
9d8b9ec4 | 4049 | " Allocation context details:"); |
7f6a11e7 | 4050 | ext4_msg(ac->ac_sb, KERN_ERR, "status %d flags %d", |
c9de560d | 4051 | ac->ac_status, ac->ac_flags); |
7f6a11e7 | 4052 | ext4_msg(ac->ac_sb, KERN_ERR, "orig %lu/%lu/%lu@%lu, " |
9d8b9ec4 TT |
4053 | "goal %lu/%lu/%lu@%lu, " |
4054 | "best %lu/%lu/%lu@%lu cr %d", | |
c9de560d AT |
4055 | (unsigned long)ac->ac_o_ex.fe_group, |
4056 | (unsigned long)ac->ac_o_ex.fe_start, | |
4057 | (unsigned long)ac->ac_o_ex.fe_len, | |
4058 | (unsigned long)ac->ac_o_ex.fe_logical, | |
4059 | (unsigned long)ac->ac_g_ex.fe_group, | |
4060 | (unsigned long)ac->ac_g_ex.fe_start, | |
4061 | (unsigned long)ac->ac_g_ex.fe_len, | |
4062 | (unsigned long)ac->ac_g_ex.fe_logical, | |
4063 | (unsigned long)ac->ac_b_ex.fe_group, | |
4064 | (unsigned long)ac->ac_b_ex.fe_start, | |
4065 | (unsigned long)ac->ac_b_ex.fe_len, | |
4066 | (unsigned long)ac->ac_b_ex.fe_logical, | |
4067 | (int)ac->ac_criteria); | |
dc9ddd98 | 4068 | ext4_msg(ac->ac_sb, KERN_ERR, "%d found", ac->ac_found); |
7f6a11e7 | 4069 | ext4_msg(ac->ac_sb, KERN_ERR, "groups: "); |
8df9675f TT |
4070 | ngroups = ext4_get_groups_count(sb); |
4071 | for (i = 0; i < ngroups; i++) { | |
c9de560d AT |
4072 | struct ext4_group_info *grp = ext4_get_group_info(sb, i); |
4073 | struct ext4_prealloc_space *pa; | |
4074 | ext4_grpblk_t start; | |
4075 | struct list_head *cur; | |
4076 | ext4_lock_group(sb, i); | |
4077 | list_for_each(cur, &grp->bb_prealloc_list) { | |
4078 | pa = list_entry(cur, struct ext4_prealloc_space, | |
4079 | pa_group_list); | |
4080 | spin_lock(&pa->pa_lock); | |
4081 | ext4_get_group_no_and_offset(sb, pa->pa_pstart, | |
4082 | NULL, &start); | |
4083 | spin_unlock(&pa->pa_lock); | |
1c718505 AF |
4084 | printk(KERN_ERR "PA:%u:%d:%u \n", i, |
4085 | start, pa->pa_len); | |
c9de560d | 4086 | } |
60bd63d1 | 4087 | ext4_unlock_group(sb, i); |
c9de560d AT |
4088 | |
4089 | if (grp->bb_free == 0) | |
4090 | continue; | |
1c718505 | 4091 | printk(KERN_ERR "%u: %d/%d \n", |
c9de560d AT |
4092 | i, grp->bb_free, grp->bb_fragments); |
4093 | } | |
4094 | printk(KERN_ERR "\n"); | |
4095 | } | |
4096 | #else | |
4097 | static inline void ext4_mb_show_ac(struct ext4_allocation_context *ac) | |
4098 | { | |
4099 | return; | |
4100 | } | |
4101 | #endif | |
4102 | ||
4103 | /* | |
4104 | * We use locality group preallocation for small size file. The size of the | |
4105 | * file is determined by the current size or the resulting size after | |
4106 | * allocation which ever is larger | |
4107 | * | |
b713a5ec | 4108 | * One can tune this size via /sys/fs/ext4/<partition>/mb_stream_req |
c9de560d AT |
4109 | */ |
4110 | static void ext4_mb_group_or_file(struct ext4_allocation_context *ac) | |
4111 | { | |
4112 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); | |
4113 | int bsbits = ac->ac_sb->s_blocksize_bits; | |
4114 | loff_t size, isize; | |
4115 | ||
4116 | if (!(ac->ac_flags & EXT4_MB_HINT_DATA)) | |
4117 | return; | |
4118 | ||
4ba74d00 TT |
4119 | if (unlikely(ac->ac_flags & EXT4_MB_HINT_GOAL_ONLY)) |
4120 | return; | |
4121 | ||
53accfa9 | 4122 | size = ac->ac_o_ex.fe_logical + EXT4_C2B(sbi, ac->ac_o_ex.fe_len); |
50797481 TT |
4123 | isize = (i_size_read(ac->ac_inode) + ac->ac_sb->s_blocksize - 1) |
4124 | >> bsbits; | |
c9de560d | 4125 | |
50797481 TT |
4126 | if ((size == isize) && |
4127 | !ext4_fs_is_busy(sbi) && | |
4128 | (atomic_read(&ac->ac_inode->i_writecount) == 0)) { | |
4129 | ac->ac_flags |= EXT4_MB_HINT_NOPREALLOC; | |
4130 | return; | |
4131 | } | |
4132 | ||
ebbe0277 RD |
4133 | if (sbi->s_mb_group_prealloc <= 0) { |
4134 | ac->ac_flags |= EXT4_MB_STREAM_ALLOC; | |
4135 | return; | |
4136 | } | |
4137 | ||
c9de560d | 4138 | /* don't use group allocation for large files */ |
71780577 | 4139 | size = max(size, isize); |
cc483f10 | 4140 | if (size > sbi->s_mb_stream_request) { |
4ba74d00 | 4141 | ac->ac_flags |= EXT4_MB_STREAM_ALLOC; |
c9de560d | 4142 | return; |
4ba74d00 | 4143 | } |
c9de560d AT |
4144 | |
4145 | BUG_ON(ac->ac_lg != NULL); | |
4146 | /* | |
4147 | * locality group prealloc space are per cpu. The reason for having | |
4148 | * per cpu locality group is to reduce the contention between block | |
4149 | * request from multiple CPUs. | |
4150 | */ | |
a0b6bc63 | 4151 | ac->ac_lg = raw_cpu_ptr(sbi->s_locality_groups); |
c9de560d AT |
4152 | |
4153 | /* we're going to use group allocation */ | |
4154 | ac->ac_flags |= EXT4_MB_HINT_GROUP_ALLOC; | |
4155 | ||
4156 | /* serialize all allocations in the group */ | |
4157 | mutex_lock(&ac->ac_lg->lg_mutex); | |
4158 | } | |
4159 | ||
4ddfef7b ES |
4160 | static noinline_for_stack int |
4161 | ext4_mb_initialize_context(struct ext4_allocation_context *ac, | |
c9de560d AT |
4162 | struct ext4_allocation_request *ar) |
4163 | { | |
4164 | struct super_block *sb = ar->inode->i_sb; | |
4165 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
4166 | struct ext4_super_block *es = sbi->s_es; | |
4167 | ext4_group_t group; | |
498e5f24 TT |
4168 | unsigned int len; |
4169 | ext4_fsblk_t goal; | |
c9de560d AT |
4170 | ext4_grpblk_t block; |
4171 | ||
4172 | /* we can't allocate > group size */ | |
4173 | len = ar->len; | |
4174 | ||
4175 | /* just a dirty hack to filter too big requests */ | |
40ae3487 TT |
4176 | if (len >= EXT4_CLUSTERS_PER_GROUP(sb)) |
4177 | len = EXT4_CLUSTERS_PER_GROUP(sb); | |
c9de560d AT |
4178 | |
4179 | /* start searching from the goal */ | |
4180 | goal = ar->goal; | |
4181 | if (goal < le32_to_cpu(es->s_first_data_block) || | |
4182 | goal >= ext4_blocks_count(es)) | |
4183 | goal = le32_to_cpu(es->s_first_data_block); | |
4184 | ext4_get_group_no_and_offset(sb, goal, &group, &block); | |
4185 | ||
4186 | /* set up allocation goals */ | |
f5a44db5 | 4187 | ac->ac_b_ex.fe_logical = EXT4_LBLK_CMASK(sbi, ar->logical); |
c9de560d | 4188 | ac->ac_status = AC_STATUS_CONTINUE; |
c9de560d AT |
4189 | ac->ac_sb = sb; |
4190 | ac->ac_inode = ar->inode; | |
53accfa9 | 4191 | ac->ac_o_ex.fe_logical = ac->ac_b_ex.fe_logical; |
c9de560d AT |
4192 | ac->ac_o_ex.fe_group = group; |
4193 | ac->ac_o_ex.fe_start = block; | |
4194 | ac->ac_o_ex.fe_len = len; | |
53accfa9 | 4195 | ac->ac_g_ex = ac->ac_o_ex; |
c9de560d | 4196 | ac->ac_flags = ar->flags; |
c9de560d AT |
4197 | |
4198 | /* we have to define context: we'll we work with a file or | |
4199 | * locality group. this is a policy, actually */ | |
4200 | ext4_mb_group_or_file(ac); | |
4201 | ||
6ba495e9 | 4202 | mb_debug(1, "init ac: %u blocks @ %u, goal %u, flags %x, 2^%d, " |
c9de560d AT |
4203 | "left: %u/%u, right %u/%u to %swritable\n", |
4204 | (unsigned) ar->len, (unsigned) ar->logical, | |
4205 | (unsigned) ar->goal, ac->ac_flags, ac->ac_2order, | |
4206 | (unsigned) ar->lleft, (unsigned) ar->pleft, | |
4207 | (unsigned) ar->lright, (unsigned) ar->pright, | |
4208 | atomic_read(&ar->inode->i_writecount) ? "" : "non-"); | |
4209 | return 0; | |
4210 | ||
4211 | } | |
4212 | ||
6be2ded1 AK |
4213 | static noinline_for_stack void |
4214 | ext4_mb_discard_lg_preallocations(struct super_block *sb, | |
4215 | struct ext4_locality_group *lg, | |
4216 | int order, int total_entries) | |
4217 | { | |
4218 | ext4_group_t group = 0; | |
4219 | struct ext4_buddy e4b; | |
4220 | struct list_head discard_list; | |
4221 | struct ext4_prealloc_space *pa, *tmp; | |
6be2ded1 | 4222 | |
6ba495e9 | 4223 | mb_debug(1, "discard locality group preallocation\n"); |
6be2ded1 AK |
4224 | |
4225 | INIT_LIST_HEAD(&discard_list); | |
6be2ded1 AK |
4226 | |
4227 | spin_lock(&lg->lg_prealloc_lock); | |
4228 | list_for_each_entry_rcu(pa, &lg->lg_prealloc_list[order], | |
4229 | pa_inode_list) { | |
4230 | spin_lock(&pa->pa_lock); | |
4231 | if (atomic_read(&pa->pa_count)) { | |
4232 | /* | |
4233 | * This is the pa that we just used | |
4234 | * for block allocation. So don't | |
4235 | * free that | |
4236 | */ | |
4237 | spin_unlock(&pa->pa_lock); | |
4238 | continue; | |
4239 | } | |
4240 | if (pa->pa_deleted) { | |
4241 | spin_unlock(&pa->pa_lock); | |
4242 | continue; | |
4243 | } | |
4244 | /* only lg prealloc space */ | |
cc0fb9ad | 4245 | BUG_ON(pa->pa_type != MB_GROUP_PA); |
6be2ded1 AK |
4246 | |
4247 | /* seems this one can be freed ... */ | |
4248 | pa->pa_deleted = 1; | |
4249 | spin_unlock(&pa->pa_lock); | |
4250 | ||
4251 | list_del_rcu(&pa->pa_inode_list); | |
4252 | list_add(&pa->u.pa_tmp_list, &discard_list); | |
4253 | ||
4254 | total_entries--; | |
4255 | if (total_entries <= 5) { | |
4256 | /* | |
4257 | * we want to keep only 5 entries | |
4258 | * allowing it to grow to 8. This | |
4259 | * mak sure we don't call discard | |
4260 | * soon for this list. | |
4261 | */ | |
4262 | break; | |
4263 | } | |
4264 | } | |
4265 | spin_unlock(&lg->lg_prealloc_lock); | |
4266 | ||
4267 | list_for_each_entry_safe(pa, tmp, &discard_list, u.pa_tmp_list) { | |
4268 | ||
bd86298e | 4269 | group = ext4_get_group_number(sb, pa->pa_pstart); |
6be2ded1 | 4270 | if (ext4_mb_load_buddy(sb, group, &e4b)) { |
12062ddd ES |
4271 | ext4_error(sb, "Error loading buddy information for %u", |
4272 | group); | |
6be2ded1 AK |
4273 | continue; |
4274 | } | |
4275 | ext4_lock_group(sb, group); | |
4276 | list_del(&pa->pa_group_list); | |
3e1e5f50 | 4277 | ext4_mb_release_group_pa(&e4b, pa); |
6be2ded1 AK |
4278 | ext4_unlock_group(sb, group); |
4279 | ||
e39e07fd | 4280 | ext4_mb_unload_buddy(&e4b); |
6be2ded1 AK |
4281 | list_del(&pa->u.pa_tmp_list); |
4282 | call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback); | |
4283 | } | |
6be2ded1 AK |
4284 | } |
4285 | ||
4286 | /* | |
4287 | * We have incremented pa_count. So it cannot be freed at this | |
4288 | * point. Also we hold lg_mutex. So no parallel allocation is | |
4289 | * possible from this lg. That means pa_free cannot be updated. | |
4290 | * | |
4291 | * A parallel ext4_mb_discard_group_preallocations is possible. | |
4292 | * which can cause the lg_prealloc_list to be updated. | |
4293 | */ | |
4294 | ||
4295 | static void ext4_mb_add_n_trim(struct ext4_allocation_context *ac) | |
4296 | { | |
4297 | int order, added = 0, lg_prealloc_count = 1; | |
4298 | struct super_block *sb = ac->ac_sb; | |
4299 | struct ext4_locality_group *lg = ac->ac_lg; | |
4300 | struct ext4_prealloc_space *tmp_pa, *pa = ac->ac_pa; | |
4301 | ||
4302 | order = fls(pa->pa_free) - 1; | |
4303 | if (order > PREALLOC_TB_SIZE - 1) | |
4304 | /* The max size of hash table is PREALLOC_TB_SIZE */ | |
4305 | order = PREALLOC_TB_SIZE - 1; | |
4306 | /* Add the prealloc space to lg */ | |
f1167009 | 4307 | spin_lock(&lg->lg_prealloc_lock); |
6be2ded1 AK |
4308 | list_for_each_entry_rcu(tmp_pa, &lg->lg_prealloc_list[order], |
4309 | pa_inode_list) { | |
4310 | spin_lock(&tmp_pa->pa_lock); | |
4311 | if (tmp_pa->pa_deleted) { | |
e7c9e3e9 | 4312 | spin_unlock(&tmp_pa->pa_lock); |
6be2ded1 AK |
4313 | continue; |
4314 | } | |
4315 | if (!added && pa->pa_free < tmp_pa->pa_free) { | |
4316 | /* Add to the tail of the previous entry */ | |
4317 | list_add_tail_rcu(&pa->pa_inode_list, | |
4318 | &tmp_pa->pa_inode_list); | |
4319 | added = 1; | |
4320 | /* | |
4321 | * we want to count the total | |
4322 | * number of entries in the list | |
4323 | */ | |
4324 | } | |
4325 | spin_unlock(&tmp_pa->pa_lock); | |
4326 | lg_prealloc_count++; | |
4327 | } | |
4328 | if (!added) | |
4329 | list_add_tail_rcu(&pa->pa_inode_list, | |
4330 | &lg->lg_prealloc_list[order]); | |
f1167009 | 4331 | spin_unlock(&lg->lg_prealloc_lock); |
6be2ded1 AK |
4332 | |
4333 | /* Now trim the list to be not more than 8 elements */ | |
4334 | if (lg_prealloc_count > 8) { | |
4335 | ext4_mb_discard_lg_preallocations(sb, lg, | |
f1167009 | 4336 | order, lg_prealloc_count); |
6be2ded1 AK |
4337 | return; |
4338 | } | |
4339 | return ; | |
4340 | } | |
4341 | ||
c9de560d AT |
4342 | /* |
4343 | * release all resource we used in allocation | |
4344 | */ | |
4345 | static int ext4_mb_release_context(struct ext4_allocation_context *ac) | |
4346 | { | |
53accfa9 | 4347 | struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb); |
6be2ded1 AK |
4348 | struct ext4_prealloc_space *pa = ac->ac_pa; |
4349 | if (pa) { | |
cc0fb9ad | 4350 | if (pa->pa_type == MB_GROUP_PA) { |
c9de560d | 4351 | /* see comment in ext4_mb_use_group_pa() */ |
6be2ded1 | 4352 | spin_lock(&pa->pa_lock); |
53accfa9 TT |
4353 | pa->pa_pstart += EXT4_C2B(sbi, ac->ac_b_ex.fe_len); |
4354 | pa->pa_lstart += EXT4_C2B(sbi, ac->ac_b_ex.fe_len); | |
6be2ded1 AK |
4355 | pa->pa_free -= ac->ac_b_ex.fe_len; |
4356 | pa->pa_len -= ac->ac_b_ex.fe_len; | |
4357 | spin_unlock(&pa->pa_lock); | |
c9de560d | 4358 | } |
c9de560d | 4359 | } |
ba443916 AK |
4360 | if (pa) { |
4361 | /* | |
4362 | * We want to add the pa to the right bucket. | |
4363 | * Remove it from the list and while adding | |
4364 | * make sure the list to which we are adding | |
44183d42 | 4365 | * doesn't grow big. |
ba443916 | 4366 | */ |
cc0fb9ad | 4367 | if ((pa->pa_type == MB_GROUP_PA) && likely(pa->pa_free)) { |
ba443916 AK |
4368 | spin_lock(pa->pa_obj_lock); |
4369 | list_del_rcu(&pa->pa_inode_list); | |
4370 | spin_unlock(pa->pa_obj_lock); | |
4371 | ext4_mb_add_n_trim(ac); | |
4372 | } | |
4373 | ext4_mb_put_pa(ac, ac->ac_sb, pa); | |
4374 | } | |
c9de560d AT |
4375 | if (ac->ac_bitmap_page) |
4376 | page_cache_release(ac->ac_bitmap_page); | |
4377 | if (ac->ac_buddy_page) | |
4378 | page_cache_release(ac->ac_buddy_page); | |
4379 | if (ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC) | |
4380 | mutex_unlock(&ac->ac_lg->lg_mutex); | |
4381 | ext4_mb_collect_stats(ac); | |
4382 | return 0; | |
4383 | } | |
4384 | ||
4385 | static int ext4_mb_discard_preallocations(struct super_block *sb, int needed) | |
4386 | { | |
8df9675f | 4387 | ext4_group_t i, ngroups = ext4_get_groups_count(sb); |
c9de560d AT |
4388 | int ret; |
4389 | int freed = 0; | |
4390 | ||
9bffad1e | 4391 | trace_ext4_mb_discard_preallocations(sb, needed); |
8df9675f | 4392 | for (i = 0; i < ngroups && needed > 0; i++) { |
c9de560d AT |
4393 | ret = ext4_mb_discard_group_preallocations(sb, i, needed); |
4394 | freed += ret; | |
4395 | needed -= ret; | |
4396 | } | |
4397 | ||
4398 | return freed; | |
4399 | } | |
4400 | ||
4401 | /* | |
4402 | * Main entry point into mballoc to allocate blocks | |
4403 | * it tries to use preallocation first, then falls back | |
4404 | * to usual allocation | |
4405 | */ | |
4406 | ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle, | |
6c7a120a | 4407 | struct ext4_allocation_request *ar, int *errp) |
c9de560d | 4408 | { |
6bc6e63f | 4409 | int freed; |
256bdb49 | 4410 | struct ext4_allocation_context *ac = NULL; |
c9de560d AT |
4411 | struct ext4_sb_info *sbi; |
4412 | struct super_block *sb; | |
4413 | ext4_fsblk_t block = 0; | |
60e58e0f | 4414 | unsigned int inquota = 0; |
53accfa9 | 4415 | unsigned int reserv_clstrs = 0; |
c9de560d | 4416 | |
b10a44c3 | 4417 | might_sleep(); |
c9de560d AT |
4418 | sb = ar->inode->i_sb; |
4419 | sbi = EXT4_SB(sb); | |
4420 | ||
9bffad1e | 4421 | trace_ext4_request_blocks(ar); |
ba80b101 | 4422 | |
45dc63e7 DM |
4423 | /* Allow to use superuser reservation for quota file */ |
4424 | if (IS_NOQUOTA(ar->inode)) | |
4425 | ar->flags |= EXT4_MB_USE_ROOT_BLOCKS; | |
4426 | ||
e3cf5d5d | 4427 | if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0) { |
60e58e0f MC |
4428 | /* Without delayed allocation we need to verify |
4429 | * there is enough free blocks to do block allocation | |
4430 | * and verify allocation doesn't exceed the quota limits. | |
d2a17637 | 4431 | */ |
55f020db | 4432 | while (ar->len && |
e7d5f315 | 4433 | ext4_claim_free_clusters(sbi, ar->len, ar->flags)) { |
55f020db | 4434 | |
030ba6bc | 4435 | /* let others to free the space */ |
bb8b20ed | 4436 | cond_resched(); |
030ba6bc AK |
4437 | ar->len = ar->len >> 1; |
4438 | } | |
4439 | if (!ar->len) { | |
a30d542a AK |
4440 | *errp = -ENOSPC; |
4441 | return 0; | |
4442 | } | |
53accfa9 | 4443 | reserv_clstrs = ar->len; |
55f020db | 4444 | if (ar->flags & EXT4_MB_USE_ROOT_BLOCKS) { |
53accfa9 TT |
4445 | dquot_alloc_block_nofail(ar->inode, |
4446 | EXT4_C2B(sbi, ar->len)); | |
55f020db AH |
4447 | } else { |
4448 | while (ar->len && | |
53accfa9 TT |
4449 | dquot_alloc_block(ar->inode, |
4450 | EXT4_C2B(sbi, ar->len))) { | |
55f020db AH |
4451 | |
4452 | ar->flags |= EXT4_MB_HINT_NOPREALLOC; | |
4453 | ar->len--; | |
4454 | } | |
60e58e0f MC |
4455 | } |
4456 | inquota = ar->len; | |
4457 | if (ar->len == 0) { | |
4458 | *errp = -EDQUOT; | |
6c7a120a | 4459 | goto out; |
60e58e0f | 4460 | } |
07031431 | 4461 | } |
d2a17637 | 4462 | |
85556c9a | 4463 | ac = kmem_cache_zalloc(ext4_ac_cachep, GFP_NOFS); |
833576b3 | 4464 | if (!ac) { |
363d4251 | 4465 | ar->len = 0; |
256bdb49 | 4466 | *errp = -ENOMEM; |
6c7a120a | 4467 | goto out; |
256bdb49 ES |
4468 | } |
4469 | ||
256bdb49 | 4470 | *errp = ext4_mb_initialize_context(ac, ar); |
c9de560d AT |
4471 | if (*errp) { |
4472 | ar->len = 0; | |
6c7a120a | 4473 | goto out; |
c9de560d AT |
4474 | } |
4475 | ||
256bdb49 ES |
4476 | ac->ac_op = EXT4_MB_HISTORY_PREALLOC; |
4477 | if (!ext4_mb_use_preallocated(ac)) { | |
256bdb49 ES |
4478 | ac->ac_op = EXT4_MB_HISTORY_ALLOC; |
4479 | ext4_mb_normalize_request(ac, ar); | |
c9de560d AT |
4480 | repeat: |
4481 | /* allocate space in core */ | |
6c7a120a | 4482 | *errp = ext4_mb_regular_allocator(ac); |
2c00ef3e AK |
4483 | if (*errp) |
4484 | goto discard_and_exit; | |
c9de560d AT |
4485 | |
4486 | /* as we've just preallocated more space than | |
2c00ef3e | 4487 | * user requested originally, we store allocated |
c9de560d | 4488 | * space in a special descriptor */ |
256bdb49 | 4489 | if (ac->ac_status == AC_STATUS_FOUND && |
2c00ef3e AK |
4490 | ac->ac_o_ex.fe_len < ac->ac_b_ex.fe_len) |
4491 | *errp = ext4_mb_new_preallocation(ac); | |
4492 | if (*errp) { | |
4493 | discard_and_exit: | |
4494 | ext4_discard_allocated_blocks(ac); | |
4495 | goto errout; | |
4496 | } | |
c9de560d | 4497 | } |
256bdb49 | 4498 | if (likely(ac->ac_status == AC_STATUS_FOUND)) { |
53accfa9 | 4499 | *errp = ext4_mb_mark_diskspace_used(ac, handle, reserv_clstrs); |
6c7a120a | 4500 | if (*errp == -EAGAIN) { |
8556e8f3 AK |
4501 | /* |
4502 | * drop the reference that we took | |
4503 | * in ext4_mb_use_best_found | |
4504 | */ | |
4505 | ext4_mb_release_context(ac); | |
519deca0 AK |
4506 | ac->ac_b_ex.fe_group = 0; |
4507 | ac->ac_b_ex.fe_start = 0; | |
4508 | ac->ac_b_ex.fe_len = 0; | |
4509 | ac->ac_status = AC_STATUS_CONTINUE; | |
4510 | goto repeat; | |
6d138ced | 4511 | } else if (*errp) { |
b844167e | 4512 | ext4_discard_allocated_blocks(ac); |
6d138ced ES |
4513 | goto errout; |
4514 | } else { | |
519deca0 AK |
4515 | block = ext4_grp_offs_to_block(sb, &ac->ac_b_ex); |
4516 | ar->len = ac->ac_b_ex.fe_len; | |
4517 | } | |
c9de560d | 4518 | } else { |
256bdb49 | 4519 | freed = ext4_mb_discard_preallocations(sb, ac->ac_o_ex.fe_len); |
c9de560d AT |
4520 | if (freed) |
4521 | goto repeat; | |
4522 | *errp = -ENOSPC; | |
6c7a120a AK |
4523 | } |
4524 | ||
6d138ced | 4525 | errout: |
6c7a120a | 4526 | if (*errp) { |
256bdb49 | 4527 | ac->ac_b_ex.fe_len = 0; |
c9de560d | 4528 | ar->len = 0; |
256bdb49 | 4529 | ext4_mb_show_ac(ac); |
c9de560d | 4530 | } |
256bdb49 | 4531 | ext4_mb_release_context(ac); |
6c7a120a AK |
4532 | out: |
4533 | if (ac) | |
4534 | kmem_cache_free(ext4_ac_cachep, ac); | |
60e58e0f | 4535 | if (inquota && ar->len < inquota) |
53accfa9 | 4536 | dquot_free_block(ar->inode, EXT4_C2B(sbi, inquota - ar->len)); |
0087d9fb | 4537 | if (!ar->len) { |
e3cf5d5d | 4538 | if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0) |
0087d9fb | 4539 | /* release all the reserved blocks if non delalloc */ |
57042651 | 4540 | percpu_counter_sub(&sbi->s_dirtyclusters_counter, |
53accfa9 | 4541 | reserv_clstrs); |
0087d9fb | 4542 | } |
c9de560d | 4543 | |
9bffad1e | 4544 | trace_ext4_allocate_blocks(ar, (unsigned long long)block); |
ba80b101 | 4545 | |
c9de560d AT |
4546 | return block; |
4547 | } | |
c9de560d | 4548 | |
c894058d AK |
4549 | /* |
4550 | * We can merge two free data extents only if the physical blocks | |
4551 | * are contiguous, AND the extents were freed by the same transaction, | |
4552 | * AND the blocks are associated with the same group. | |
4553 | */ | |
4554 | static int can_merge(struct ext4_free_data *entry1, | |
4555 | struct ext4_free_data *entry2) | |
4556 | { | |
18aadd47 BJ |
4557 | if ((entry1->efd_tid == entry2->efd_tid) && |
4558 | (entry1->efd_group == entry2->efd_group) && | |
4559 | ((entry1->efd_start_cluster + entry1->efd_count) == entry2->efd_start_cluster)) | |
c894058d AK |
4560 | return 1; |
4561 | return 0; | |
4562 | } | |
4563 | ||
4ddfef7b ES |
4564 | static noinline_for_stack int |
4565 | ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b, | |
7a2fcbf7 | 4566 | struct ext4_free_data *new_entry) |
c9de560d | 4567 | { |
e29136f8 | 4568 | ext4_group_t group = e4b->bd_group; |
84130193 | 4569 | ext4_grpblk_t cluster; |
7a2fcbf7 | 4570 | struct ext4_free_data *entry; |
c9de560d AT |
4571 | struct ext4_group_info *db = e4b->bd_info; |
4572 | struct super_block *sb = e4b->bd_sb; | |
4573 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
c894058d AK |
4574 | struct rb_node **n = &db->bb_free_root.rb_node, *node; |
4575 | struct rb_node *parent = NULL, *new_node; | |
4576 | ||
0390131b | 4577 | BUG_ON(!ext4_handle_valid(handle)); |
c9de560d AT |
4578 | BUG_ON(e4b->bd_bitmap_page == NULL); |
4579 | BUG_ON(e4b->bd_buddy_page == NULL); | |
4580 | ||
18aadd47 BJ |
4581 | new_node = &new_entry->efd_node; |
4582 | cluster = new_entry->efd_start_cluster; | |
c894058d | 4583 | |
c894058d AK |
4584 | if (!*n) { |
4585 | /* first free block exent. We need to | |
4586 | protect buddy cache from being freed, | |
4587 | * otherwise we'll refresh it from | |
4588 | * on-disk bitmap and lose not-yet-available | |
4589 | * blocks */ | |
4590 | page_cache_get(e4b->bd_buddy_page); | |
4591 | page_cache_get(e4b->bd_bitmap_page); | |
4592 | } | |
4593 | while (*n) { | |
4594 | parent = *n; | |
18aadd47 BJ |
4595 | entry = rb_entry(parent, struct ext4_free_data, efd_node); |
4596 | if (cluster < entry->efd_start_cluster) | |
c894058d | 4597 | n = &(*n)->rb_left; |
18aadd47 | 4598 | else if (cluster >= (entry->efd_start_cluster + entry->efd_count)) |
c894058d AK |
4599 | n = &(*n)->rb_right; |
4600 | else { | |
e29136f8 | 4601 | ext4_grp_locked_error(sb, group, 0, |
84130193 TT |
4602 | ext4_group_first_block_no(sb, group) + |
4603 | EXT4_C2B(sbi, cluster), | |
e29136f8 | 4604 | "Block already on to-be-freed list"); |
c894058d | 4605 | return 0; |
c9de560d | 4606 | } |
c894058d | 4607 | } |
c9de560d | 4608 | |
c894058d AK |
4609 | rb_link_node(new_node, parent, n); |
4610 | rb_insert_color(new_node, &db->bb_free_root); | |
4611 | ||
4612 | /* Now try to see the extent can be merged to left and right */ | |
4613 | node = rb_prev(new_node); | |
4614 | if (node) { | |
18aadd47 | 4615 | entry = rb_entry(node, struct ext4_free_data, efd_node); |
5d3ee208 DM |
4616 | if (can_merge(entry, new_entry) && |
4617 | ext4_journal_callback_try_del(handle, &entry->efd_jce)) { | |
18aadd47 BJ |
4618 | new_entry->efd_start_cluster = entry->efd_start_cluster; |
4619 | new_entry->efd_count += entry->efd_count; | |
c894058d | 4620 | rb_erase(node, &(db->bb_free_root)); |
18aadd47 | 4621 | kmem_cache_free(ext4_free_data_cachep, entry); |
c9de560d | 4622 | } |
c894058d | 4623 | } |
c9de560d | 4624 | |
c894058d AK |
4625 | node = rb_next(new_node); |
4626 | if (node) { | |
18aadd47 | 4627 | entry = rb_entry(node, struct ext4_free_data, efd_node); |
5d3ee208 DM |
4628 | if (can_merge(new_entry, entry) && |
4629 | ext4_journal_callback_try_del(handle, &entry->efd_jce)) { | |
18aadd47 | 4630 | new_entry->efd_count += entry->efd_count; |
c894058d | 4631 | rb_erase(node, &(db->bb_free_root)); |
18aadd47 | 4632 | kmem_cache_free(ext4_free_data_cachep, entry); |
c9de560d AT |
4633 | } |
4634 | } | |
3e624fc7 | 4635 | /* Add the extent to transaction's private list */ |
18aadd47 BJ |
4636 | ext4_journal_callback_add(handle, ext4_free_data_callback, |
4637 | &new_entry->efd_jce); | |
c9de560d AT |
4638 | return 0; |
4639 | } | |
4640 | ||
44338711 TT |
4641 | /** |
4642 | * ext4_free_blocks() -- Free given blocks and update quota | |
4643 | * @handle: handle for this transaction | |
4644 | * @inode: inode | |
4645 | * @block: start physical block to free | |
4646 | * @count: number of blocks to count | |
5def1360 | 4647 | * @flags: flags used by ext4_free_blocks |
c9de560d | 4648 | */ |
44338711 | 4649 | void ext4_free_blocks(handle_t *handle, struct inode *inode, |
e6362609 TT |
4650 | struct buffer_head *bh, ext4_fsblk_t block, |
4651 | unsigned long count, int flags) | |
c9de560d | 4652 | { |
26346ff6 | 4653 | struct buffer_head *bitmap_bh = NULL; |
c9de560d | 4654 | struct super_block *sb = inode->i_sb; |
c9de560d | 4655 | struct ext4_group_desc *gdp; |
498e5f24 | 4656 | unsigned int overflow; |
c9de560d AT |
4657 | ext4_grpblk_t bit; |
4658 | struct buffer_head *gd_bh; | |
4659 | ext4_group_t block_group; | |
4660 | struct ext4_sb_info *sbi; | |
4661 | struct ext4_buddy e4b; | |
84130193 | 4662 | unsigned int count_clusters; |
c9de560d AT |
4663 | int err = 0; |
4664 | int ret; | |
4665 | ||
b10a44c3 | 4666 | might_sleep(); |
e6362609 TT |
4667 | if (bh) { |
4668 | if (block) | |
4669 | BUG_ON(block != bh->b_blocknr); | |
4670 | else | |
4671 | block = bh->b_blocknr; | |
4672 | } | |
c9de560d | 4673 | |
c9de560d | 4674 | sbi = EXT4_SB(sb); |
1f2acb60 TT |
4675 | if (!(flags & EXT4_FREE_BLOCKS_VALIDATED) && |
4676 | !ext4_data_block_valid(sbi, block, count)) { | |
12062ddd | 4677 | ext4_error(sb, "Freeing blocks not in datazone - " |
1f2acb60 | 4678 | "block = %llu, count = %lu", block, count); |
c9de560d AT |
4679 | goto error_return; |
4680 | } | |
4681 | ||
0610b6e9 | 4682 | ext4_debug("freeing block %llu\n", block); |
e6362609 TT |
4683 | trace_ext4_free_blocks(inode, block, count, flags); |
4684 | ||
4685 | if (flags & EXT4_FREE_BLOCKS_FORGET) { | |
4686 | struct buffer_head *tbh = bh; | |
4687 | int i; | |
4688 | ||
4689 | BUG_ON(bh && (count > 1)); | |
4690 | ||
4691 | for (i = 0; i < count; i++) { | |
2ed5724d | 4692 | cond_resched(); |
e6362609 TT |
4693 | if (!bh) |
4694 | tbh = sb_find_get_block(inode->i_sb, | |
4695 | block + i); | |
2ed5724d | 4696 | if (!tbh) |
87783690 | 4697 | continue; |
60e6679e | 4698 | ext4_forget(handle, flags & EXT4_FREE_BLOCKS_METADATA, |
e6362609 TT |
4699 | inode, tbh, block + i); |
4700 | } | |
4701 | } | |
4702 | ||
60e6679e | 4703 | /* |
e6362609 TT |
4704 | * We need to make sure we don't reuse the freed block until |
4705 | * after the transaction is committed, which we can do by | |
4706 | * treating the block as metadata, below. We make an | |
4707 | * exception if the inode is to be written in writeback mode | |
4708 | * since writeback mode has weak data consistency guarantees. | |
4709 | */ | |
4710 | if (!ext4_should_writeback_data(inode)) | |
4711 | flags |= EXT4_FREE_BLOCKS_METADATA; | |
c9de560d | 4712 | |
84130193 TT |
4713 | /* |
4714 | * If the extent to be freed does not begin on a cluster | |
4715 | * boundary, we need to deal with partial clusters at the | |
4716 | * beginning and end of the extent. Normally we will free | |
4717 | * blocks at the beginning or the end unless we are explicitly | |
4718 | * requested to avoid doing so. | |
4719 | */ | |
f5a44db5 | 4720 | overflow = EXT4_PBLK_COFF(sbi, block); |
84130193 TT |
4721 | if (overflow) { |
4722 | if (flags & EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER) { | |
4723 | overflow = sbi->s_cluster_ratio - overflow; | |
4724 | block += overflow; | |
4725 | if (count > overflow) | |
4726 | count -= overflow; | |
4727 | else | |
4728 | return; | |
4729 | } else { | |
4730 | block -= overflow; | |
4731 | count += overflow; | |
4732 | } | |
4733 | } | |
f5a44db5 | 4734 | overflow = EXT4_LBLK_COFF(sbi, count); |
84130193 TT |
4735 | if (overflow) { |
4736 | if (flags & EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER) { | |
4737 | if (count > overflow) | |
4738 | count -= overflow; | |
4739 | else | |
4740 | return; | |
4741 | } else | |
4742 | count += sbi->s_cluster_ratio - overflow; | |
4743 | } | |
4744 | ||
c9de560d AT |
4745 | do_more: |
4746 | overflow = 0; | |
4747 | ext4_get_group_no_and_offset(sb, block, &block_group, &bit); | |
4748 | ||
163a203d DW |
4749 | if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT( |
4750 | ext4_get_group_info(sb, block_group)))) | |
4751 | return; | |
4752 | ||
c9de560d AT |
4753 | /* |
4754 | * Check to see if we are freeing blocks across a group | |
4755 | * boundary. | |
4756 | */ | |
84130193 TT |
4757 | if (EXT4_C2B(sbi, bit) + count > EXT4_BLOCKS_PER_GROUP(sb)) { |
4758 | overflow = EXT4_C2B(sbi, bit) + count - | |
4759 | EXT4_BLOCKS_PER_GROUP(sb); | |
c9de560d AT |
4760 | count -= overflow; |
4761 | } | |
810da240 | 4762 | count_clusters = EXT4_NUM_B2C(sbi, count); |
574ca174 | 4763 | bitmap_bh = ext4_read_block_bitmap(sb, block_group); |
ce89f46c AK |
4764 | if (!bitmap_bh) { |
4765 | err = -EIO; | |
c9de560d | 4766 | goto error_return; |
ce89f46c | 4767 | } |
c9de560d | 4768 | gdp = ext4_get_group_desc(sb, block_group, &gd_bh); |
ce89f46c AK |
4769 | if (!gdp) { |
4770 | err = -EIO; | |
c9de560d | 4771 | goto error_return; |
ce89f46c | 4772 | } |
c9de560d AT |
4773 | |
4774 | if (in_range(ext4_block_bitmap(sb, gdp), block, count) || | |
4775 | in_range(ext4_inode_bitmap(sb, gdp), block, count) || | |
4776 | in_range(block, ext4_inode_table(sb, gdp), | |
84130193 | 4777 | EXT4_SB(sb)->s_itb_per_group) || |
c9de560d | 4778 | in_range(block + count - 1, ext4_inode_table(sb, gdp), |
84130193 | 4779 | EXT4_SB(sb)->s_itb_per_group)) { |
c9de560d | 4780 | |
12062ddd | 4781 | ext4_error(sb, "Freeing blocks in system zone - " |
0610b6e9 | 4782 | "Block = %llu, count = %lu", block, count); |
519deca0 AK |
4783 | /* err = 0. ext4_std_error should be a no op */ |
4784 | goto error_return; | |
c9de560d AT |
4785 | } |
4786 | ||
4787 | BUFFER_TRACE(bitmap_bh, "getting write access"); | |
4788 | err = ext4_journal_get_write_access(handle, bitmap_bh); | |
4789 | if (err) | |
4790 | goto error_return; | |
4791 | ||
4792 | /* | |
4793 | * We are about to modify some metadata. Call the journal APIs | |
4794 | * to unshare ->b_data if a currently-committing transaction is | |
4795 | * using it | |
4796 | */ | |
4797 | BUFFER_TRACE(gd_bh, "get_write_access"); | |
4798 | err = ext4_journal_get_write_access(handle, gd_bh); | |
4799 | if (err) | |
4800 | goto error_return; | |
c9de560d AT |
4801 | #ifdef AGGRESSIVE_CHECK |
4802 | { | |
4803 | int i; | |
84130193 | 4804 | for (i = 0; i < count_clusters; i++) |
c9de560d AT |
4805 | BUG_ON(!mb_test_bit(bit + i, bitmap_bh->b_data)); |
4806 | } | |
4807 | #endif | |
84130193 | 4808 | trace_ext4_mballoc_free(sb, inode, block_group, bit, count_clusters); |
c9de560d | 4809 | |
920313a7 AK |
4810 | err = ext4_mb_load_buddy(sb, block_group, &e4b); |
4811 | if (err) | |
4812 | goto error_return; | |
e6362609 TT |
4813 | |
4814 | if ((flags & EXT4_FREE_BLOCKS_METADATA) && ext4_handle_valid(handle)) { | |
7a2fcbf7 AK |
4815 | struct ext4_free_data *new_entry; |
4816 | /* | |
4817 | * blocks being freed are metadata. these blocks shouldn't | |
4818 | * be used until this transaction is committed | |
4819 | */ | |
e7676a70 | 4820 | retry: |
18aadd47 | 4821 | new_entry = kmem_cache_alloc(ext4_free_data_cachep, GFP_NOFS); |
b72143ab | 4822 | if (!new_entry) { |
e7676a70 TT |
4823 | /* |
4824 | * We use a retry loop because | |
4825 | * ext4_free_blocks() is not allowed to fail. | |
4826 | */ | |
4827 | cond_resched(); | |
4828 | congestion_wait(BLK_RW_ASYNC, HZ/50); | |
4829 | goto retry; | |
b72143ab | 4830 | } |
18aadd47 BJ |
4831 | new_entry->efd_start_cluster = bit; |
4832 | new_entry->efd_group = block_group; | |
4833 | new_entry->efd_count = count_clusters; | |
4834 | new_entry->efd_tid = handle->h_transaction->t_tid; | |
955ce5f5 | 4835 | |
7a2fcbf7 | 4836 | ext4_lock_group(sb, block_group); |
84130193 | 4837 | mb_clear_bits(bitmap_bh->b_data, bit, count_clusters); |
7a2fcbf7 | 4838 | ext4_mb_free_metadata(handle, &e4b, new_entry); |
c9de560d | 4839 | } else { |
7a2fcbf7 AK |
4840 | /* need to update group_info->bb_free and bitmap |
4841 | * with group lock held. generate_buddy look at | |
4842 | * them with group lock_held | |
4843 | */ | |
d71c1ae2 LC |
4844 | if (test_opt(sb, DISCARD)) { |
4845 | err = ext4_issue_discard(sb, block_group, bit, count); | |
4846 | if (err && err != -EOPNOTSUPP) | |
4847 | ext4_msg(sb, KERN_WARNING, "discard request in" | |
4848 | " group:%d block:%d count:%lu failed" | |
4849 | " with %d", block_group, bit, count, | |
4850 | err); | |
8f9ff189 LC |
4851 | } else |
4852 | EXT4_MB_GRP_CLEAR_TRIMMED(e4b.bd_info); | |
d71c1ae2 | 4853 | |
955ce5f5 | 4854 | ext4_lock_group(sb, block_group); |
84130193 TT |
4855 | mb_clear_bits(bitmap_bh->b_data, bit, count_clusters); |
4856 | mb_free_blocks(inode, &e4b, bit, count_clusters); | |
c9de560d AT |
4857 | } |
4858 | ||
021b65bb TT |
4859 | ret = ext4_free_group_clusters(sb, gdp) + count_clusters; |
4860 | ext4_free_group_clusters_set(sb, gdp, ret); | |
79f1ba49 | 4861 | ext4_block_bitmap_csum_set(sb, block_group, gdp, bitmap_bh); |
feb0ab32 | 4862 | ext4_group_desc_csum_set(sb, block_group, gdp); |
955ce5f5 | 4863 | ext4_unlock_group(sb, block_group); |
c9de560d | 4864 | |
772cb7c8 JS |
4865 | if (sbi->s_log_groups_per_flex) { |
4866 | ext4_group_t flex_group = ext4_flex_group(sbi, block_group); | |
90ba983f TT |
4867 | atomic64_add(count_clusters, |
4868 | &sbi->s_flex_groups[flex_group].free_clusters); | |
772cb7c8 JS |
4869 | } |
4870 | ||
71d4f7d0 | 4871 | if (!(flags & EXT4_FREE_BLOCKS_NO_QUOT_UPDATE)) |
7b415bf6 | 4872 | dquot_free_block(inode, EXT4_C2B(sbi, count_clusters)); |
7d734532 JK |
4873 | percpu_counter_add(&sbi->s_freeclusters_counter, count_clusters); |
4874 | ||
4875 | ext4_mb_unload_buddy(&e4b); | |
7b415bf6 | 4876 | |
7a2fcbf7 AK |
4877 | /* We dirtied the bitmap block */ |
4878 | BUFFER_TRACE(bitmap_bh, "dirtied bitmap block"); | |
4879 | err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); | |
4880 | ||
c9de560d AT |
4881 | /* And the group descriptor block */ |
4882 | BUFFER_TRACE(gd_bh, "dirtied group descriptor block"); | |
0390131b | 4883 | ret = ext4_handle_dirty_metadata(handle, NULL, gd_bh); |
c9de560d AT |
4884 | if (!err) |
4885 | err = ret; | |
4886 | ||
4887 | if (overflow && !err) { | |
4888 | block += count; | |
4889 | count = overflow; | |
4890 | put_bh(bitmap_bh); | |
4891 | goto do_more; | |
4892 | } | |
c9de560d AT |
4893 | error_return: |
4894 | brelse(bitmap_bh); | |
4895 | ext4_std_error(sb, err); | |
4896 | return; | |
4897 | } | |
7360d173 | 4898 | |
2846e820 | 4899 | /** |
0529155e | 4900 | * ext4_group_add_blocks() -- Add given blocks to an existing group |
2846e820 AG |
4901 | * @handle: handle to this transaction |
4902 | * @sb: super block | |
4907cb7b | 4903 | * @block: start physical block to add to the block group |
2846e820 AG |
4904 | * @count: number of blocks to free |
4905 | * | |
e73a347b | 4906 | * This marks the blocks as free in the bitmap and buddy. |
2846e820 | 4907 | */ |
cc7365df | 4908 | int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, |
2846e820 AG |
4909 | ext4_fsblk_t block, unsigned long count) |
4910 | { | |
4911 | struct buffer_head *bitmap_bh = NULL; | |
4912 | struct buffer_head *gd_bh; | |
4913 | ext4_group_t block_group; | |
4914 | ext4_grpblk_t bit; | |
4915 | unsigned int i; | |
4916 | struct ext4_group_desc *desc; | |
4917 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
e73a347b | 4918 | struct ext4_buddy e4b; |
2846e820 AG |
4919 | int err = 0, ret, blk_free_count; |
4920 | ext4_grpblk_t blocks_freed; | |
2846e820 AG |
4921 | |
4922 | ext4_debug("Adding block(s) %llu-%llu\n", block, block + count - 1); | |
4923 | ||
4740b830 YY |
4924 | if (count == 0) |
4925 | return 0; | |
4926 | ||
2846e820 | 4927 | ext4_get_group_no_and_offset(sb, block, &block_group, &bit); |
2846e820 AG |
4928 | /* |
4929 | * Check to see if we are freeing blocks across a group | |
4930 | * boundary. | |
4931 | */ | |
cc7365df YY |
4932 | if (bit + count > EXT4_BLOCKS_PER_GROUP(sb)) { |
4933 | ext4_warning(sb, "too much blocks added to group %u\n", | |
4934 | block_group); | |
4935 | err = -EINVAL; | |
2846e820 | 4936 | goto error_return; |
cc7365df | 4937 | } |
2cd05cc3 | 4938 | |
2846e820 | 4939 | bitmap_bh = ext4_read_block_bitmap(sb, block_group); |
cc7365df YY |
4940 | if (!bitmap_bh) { |
4941 | err = -EIO; | |
2846e820 | 4942 | goto error_return; |
cc7365df YY |
4943 | } |
4944 | ||
2846e820 | 4945 | desc = ext4_get_group_desc(sb, block_group, &gd_bh); |
cc7365df YY |
4946 | if (!desc) { |
4947 | err = -EIO; | |
2846e820 | 4948 | goto error_return; |
cc7365df | 4949 | } |
2846e820 AG |
4950 | |
4951 | if (in_range(ext4_block_bitmap(sb, desc), block, count) || | |
4952 | in_range(ext4_inode_bitmap(sb, desc), block, count) || | |
4953 | in_range(block, ext4_inode_table(sb, desc), sbi->s_itb_per_group) || | |
4954 | in_range(block + count - 1, ext4_inode_table(sb, desc), | |
4955 | sbi->s_itb_per_group)) { | |
4956 | ext4_error(sb, "Adding blocks in system zones - " | |
4957 | "Block = %llu, count = %lu", | |
4958 | block, count); | |
cc7365df | 4959 | err = -EINVAL; |
2846e820 AG |
4960 | goto error_return; |
4961 | } | |
4962 | ||
2cd05cc3 TT |
4963 | BUFFER_TRACE(bitmap_bh, "getting write access"); |
4964 | err = ext4_journal_get_write_access(handle, bitmap_bh); | |
2846e820 AG |
4965 | if (err) |
4966 | goto error_return; | |
4967 | ||
4968 | /* | |
4969 | * We are about to modify some metadata. Call the journal APIs | |
4970 | * to unshare ->b_data if a currently-committing transaction is | |
4971 | * using it | |
4972 | */ | |
4973 | BUFFER_TRACE(gd_bh, "get_write_access"); | |
4974 | err = ext4_journal_get_write_access(handle, gd_bh); | |
4975 | if (err) | |
4976 | goto error_return; | |
e73a347b | 4977 | |
2846e820 AG |
4978 | for (i = 0, blocks_freed = 0; i < count; i++) { |
4979 | BUFFER_TRACE(bitmap_bh, "clear bit"); | |
e73a347b | 4980 | if (!mb_test_bit(bit + i, bitmap_bh->b_data)) { |
2846e820 AG |
4981 | ext4_error(sb, "bit already cleared for block %llu", |
4982 | (ext4_fsblk_t)(block + i)); | |
4983 | BUFFER_TRACE(bitmap_bh, "bit already cleared"); | |
4984 | } else { | |
4985 | blocks_freed++; | |
4986 | } | |
4987 | } | |
e73a347b AG |
4988 | |
4989 | err = ext4_mb_load_buddy(sb, block_group, &e4b); | |
4990 | if (err) | |
4991 | goto error_return; | |
4992 | ||
4993 | /* | |
4994 | * need to update group_info->bb_free and bitmap | |
4995 | * with group lock held. generate_buddy look at | |
4996 | * them with group lock_held | |
4997 | */ | |
2846e820 | 4998 | ext4_lock_group(sb, block_group); |
e73a347b AG |
4999 | mb_clear_bits(bitmap_bh->b_data, bit, count); |
5000 | mb_free_blocks(NULL, &e4b, bit, count); | |
021b65bb TT |
5001 | blk_free_count = blocks_freed + ext4_free_group_clusters(sb, desc); |
5002 | ext4_free_group_clusters_set(sb, desc, blk_free_count); | |
79f1ba49 | 5003 | ext4_block_bitmap_csum_set(sb, block_group, desc, bitmap_bh); |
feb0ab32 | 5004 | ext4_group_desc_csum_set(sb, block_group, desc); |
2846e820 | 5005 | ext4_unlock_group(sb, block_group); |
57042651 | 5006 | percpu_counter_add(&sbi->s_freeclusters_counter, |
810da240 | 5007 | EXT4_NUM_B2C(sbi, blocks_freed)); |
2846e820 AG |
5008 | |
5009 | if (sbi->s_log_groups_per_flex) { | |
5010 | ext4_group_t flex_group = ext4_flex_group(sbi, block_group); | |
90ba983f TT |
5011 | atomic64_add(EXT4_NUM_B2C(sbi, blocks_freed), |
5012 | &sbi->s_flex_groups[flex_group].free_clusters); | |
2846e820 | 5013 | } |
e73a347b AG |
5014 | |
5015 | ext4_mb_unload_buddy(&e4b); | |
2846e820 AG |
5016 | |
5017 | /* We dirtied the bitmap block */ | |
5018 | BUFFER_TRACE(bitmap_bh, "dirtied bitmap block"); | |
5019 | err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); | |
5020 | ||
5021 | /* And the group descriptor block */ | |
5022 | BUFFER_TRACE(gd_bh, "dirtied group descriptor block"); | |
5023 | ret = ext4_handle_dirty_metadata(handle, NULL, gd_bh); | |
5024 | if (!err) | |
5025 | err = ret; | |
5026 | ||
5027 | error_return: | |
5028 | brelse(bitmap_bh); | |
5029 | ext4_std_error(sb, err); | |
cc7365df | 5030 | return err; |
2846e820 AG |
5031 | } |
5032 | ||
7360d173 LC |
5033 | /** |
5034 | * ext4_trim_extent -- function to TRIM one single free extent in the group | |
5035 | * @sb: super block for the file system | |
5036 | * @start: starting block of the free extent in the alloc. group | |
5037 | * @count: number of blocks to TRIM | |
5038 | * @group: alloc. group we are working with | |
5039 | * @e4b: ext4 buddy for the group | |
5040 | * | |
5041 | * Trim "count" blocks starting at "start" in the "group". To assure that no | |
5042 | * one will allocate those blocks, mark it as used in buddy bitmap. This must | |
5043 | * be called with under the group lock. | |
5044 | */ | |
d71c1ae2 | 5045 | static int ext4_trim_extent(struct super_block *sb, int start, int count, |
d9f34504 | 5046 | ext4_group_t group, struct ext4_buddy *e4b) |
e2cbd587 | 5047 | __releases(bitlock) |
5048 | __acquires(bitlock) | |
7360d173 LC |
5049 | { |
5050 | struct ext4_free_extent ex; | |
d71c1ae2 | 5051 | int ret = 0; |
7360d173 | 5052 | |
b3d4c2b1 TM |
5053 | trace_ext4_trim_extent(sb, group, start, count); |
5054 | ||
7360d173 LC |
5055 | assert_spin_locked(ext4_group_lock_ptr(sb, group)); |
5056 | ||
5057 | ex.fe_start = start; | |
5058 | ex.fe_group = group; | |
5059 | ex.fe_len = count; | |
5060 | ||
5061 | /* | |
5062 | * Mark blocks used, so no one can reuse them while | |
5063 | * being trimmed. | |
5064 | */ | |
5065 | mb_mark_used(e4b, &ex); | |
5066 | ext4_unlock_group(sb, group); | |
d71c1ae2 | 5067 | ret = ext4_issue_discard(sb, group, start, count); |
7360d173 LC |
5068 | ext4_lock_group(sb, group); |
5069 | mb_free_blocks(NULL, e4b, start, ex.fe_len); | |
d71c1ae2 | 5070 | return ret; |
7360d173 LC |
5071 | } |
5072 | ||
5073 | /** | |
5074 | * ext4_trim_all_free -- function to trim all free space in alloc. group | |
5075 | * @sb: super block for file system | |
22612283 | 5076 | * @group: group to be trimmed |
7360d173 LC |
5077 | * @start: first group block to examine |
5078 | * @max: last group block to examine | |
5079 | * @minblocks: minimum extent block count | |
5080 | * | |
5081 | * ext4_trim_all_free walks through group's buddy bitmap searching for free | |
5082 | * extents. When the free block is found, ext4_trim_extent is called to TRIM | |
5083 | * the extent. | |
5084 | * | |
5085 | * | |
5086 | * ext4_trim_all_free walks through group's block bitmap searching for free | |
5087 | * extents. When the free extent is found, mark it as used in group buddy | |
5088 | * bitmap. Then issue a TRIM command on this extent and free the extent in | |
5089 | * the group buddy bitmap. This is done until whole group is scanned. | |
5090 | */ | |
0b75a840 | 5091 | static ext4_grpblk_t |
78944086 LC |
5092 | ext4_trim_all_free(struct super_block *sb, ext4_group_t group, |
5093 | ext4_grpblk_t start, ext4_grpblk_t max, | |
5094 | ext4_grpblk_t minblocks) | |
7360d173 LC |
5095 | { |
5096 | void *bitmap; | |
169ddc3e | 5097 | ext4_grpblk_t next, count = 0, free_count = 0; |
78944086 | 5098 | struct ext4_buddy e4b; |
d71c1ae2 | 5099 | int ret = 0; |
7360d173 | 5100 | |
b3d4c2b1 TM |
5101 | trace_ext4_trim_all_free(sb, group, start, max); |
5102 | ||
78944086 LC |
5103 | ret = ext4_mb_load_buddy(sb, group, &e4b); |
5104 | if (ret) { | |
5105 | ext4_error(sb, "Error in loading buddy " | |
5106 | "information for %u", group); | |
5107 | return ret; | |
5108 | } | |
78944086 | 5109 | bitmap = e4b.bd_bitmap; |
28739eea LC |
5110 | |
5111 | ext4_lock_group(sb, group); | |
3d56b8d2 TM |
5112 | if (EXT4_MB_GRP_WAS_TRIMMED(e4b.bd_info) && |
5113 | minblocks >= atomic_read(&EXT4_SB(sb)->s_last_trim_minblks)) | |
5114 | goto out; | |
5115 | ||
78944086 LC |
5116 | start = (e4b.bd_info->bb_first_free > start) ? |
5117 | e4b.bd_info->bb_first_free : start; | |
7360d173 | 5118 | |
913eed83 LC |
5119 | while (start <= max) { |
5120 | start = mb_find_next_zero_bit(bitmap, max + 1, start); | |
5121 | if (start > max) | |
7360d173 | 5122 | break; |
913eed83 | 5123 | next = mb_find_next_bit(bitmap, max + 1, start); |
7360d173 LC |
5124 | |
5125 | if ((next - start) >= minblocks) { | |
d71c1ae2 LC |
5126 | ret = ext4_trim_extent(sb, start, |
5127 | next - start, group, &e4b); | |
5128 | if (ret && ret != -EOPNOTSUPP) | |
5129 | break; | |
5130 | ret = 0; | |
7360d173 LC |
5131 | count += next - start; |
5132 | } | |
169ddc3e | 5133 | free_count += next - start; |
7360d173 LC |
5134 | start = next + 1; |
5135 | ||
5136 | if (fatal_signal_pending(current)) { | |
5137 | count = -ERESTARTSYS; | |
5138 | break; | |
5139 | } | |
5140 | ||
5141 | if (need_resched()) { | |
5142 | ext4_unlock_group(sb, group); | |
5143 | cond_resched(); | |
5144 | ext4_lock_group(sb, group); | |
5145 | } | |
5146 | ||
169ddc3e | 5147 | if ((e4b.bd_info->bb_free - free_count) < minblocks) |
7360d173 LC |
5148 | break; |
5149 | } | |
3d56b8d2 | 5150 | |
d71c1ae2 LC |
5151 | if (!ret) { |
5152 | ret = count; | |
3d56b8d2 | 5153 | EXT4_MB_GRP_SET_TRIMMED(e4b.bd_info); |
d71c1ae2 | 5154 | } |
3d56b8d2 | 5155 | out: |
7360d173 | 5156 | ext4_unlock_group(sb, group); |
78944086 | 5157 | ext4_mb_unload_buddy(&e4b); |
7360d173 LC |
5158 | |
5159 | ext4_debug("trimmed %d blocks in the group %d\n", | |
5160 | count, group); | |
5161 | ||
d71c1ae2 | 5162 | return ret; |
7360d173 LC |
5163 | } |
5164 | ||
5165 | /** | |
5166 | * ext4_trim_fs() -- trim ioctl handle function | |
5167 | * @sb: superblock for filesystem | |
5168 | * @range: fstrim_range structure | |
5169 | * | |
5170 | * start: First Byte to trim | |
5171 | * len: number of Bytes to trim from start | |
5172 | * minlen: minimum extent length in Bytes | |
5173 | * ext4_trim_fs goes through all allocation groups containing Bytes from | |
5174 | * start to start+len. For each such a group ext4_trim_all_free function | |
5175 | * is invoked to trim all free space. | |
5176 | */ | |
5177 | int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range) | |
5178 | { | |
78944086 | 5179 | struct ext4_group_info *grp; |
913eed83 | 5180 | ext4_group_t group, first_group, last_group; |
7137d7a4 | 5181 | ext4_grpblk_t cnt = 0, first_cluster, last_cluster; |
913eed83 | 5182 | uint64_t start, end, minlen, trimmed = 0; |
0f0a25bf JK |
5183 | ext4_fsblk_t first_data_blk = |
5184 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); | |
913eed83 | 5185 | ext4_fsblk_t max_blks = ext4_blocks_count(EXT4_SB(sb)->s_es); |
7360d173 LC |
5186 | int ret = 0; |
5187 | ||
5188 | start = range->start >> sb->s_blocksize_bits; | |
913eed83 | 5189 | end = start + (range->len >> sb->s_blocksize_bits) - 1; |
aaf7d73e LC |
5190 | minlen = EXT4_NUM_B2C(EXT4_SB(sb), |
5191 | range->minlen >> sb->s_blocksize_bits); | |
7360d173 | 5192 | |
5de35e8d LC |
5193 | if (minlen > EXT4_CLUSTERS_PER_GROUP(sb) || |
5194 | start >= max_blks || | |
5195 | range->len < sb->s_blocksize) | |
7360d173 | 5196 | return -EINVAL; |
913eed83 LC |
5197 | if (end >= max_blks) |
5198 | end = max_blks - 1; | |
5199 | if (end <= first_data_blk) | |
22f10457 | 5200 | goto out; |
913eed83 | 5201 | if (start < first_data_blk) |
0f0a25bf | 5202 | start = first_data_blk; |
7360d173 | 5203 | |
913eed83 | 5204 | /* Determine first and last group to examine based on start and end */ |
7360d173 | 5205 | ext4_get_group_no_and_offset(sb, (ext4_fsblk_t) start, |
7137d7a4 | 5206 | &first_group, &first_cluster); |
913eed83 | 5207 | ext4_get_group_no_and_offset(sb, (ext4_fsblk_t) end, |
7137d7a4 | 5208 | &last_group, &last_cluster); |
7360d173 | 5209 | |
913eed83 LC |
5210 | /* end now represents the last cluster to discard in this group */ |
5211 | end = EXT4_CLUSTERS_PER_GROUP(sb) - 1; | |
7360d173 LC |
5212 | |
5213 | for (group = first_group; group <= last_group; group++) { | |
78944086 LC |
5214 | grp = ext4_get_group_info(sb, group); |
5215 | /* We only do this if the grp has never been initialized */ | |
5216 | if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) { | |
5217 | ret = ext4_mb_init_group(sb, group); | |
5218 | if (ret) | |
5219 | break; | |
7360d173 LC |
5220 | } |
5221 | ||
0ba08517 | 5222 | /* |
913eed83 LC |
5223 | * For all the groups except the last one, last cluster will |
5224 | * always be EXT4_CLUSTERS_PER_GROUP(sb)-1, so we only need to | |
5225 | * change it for the last group, note that last_cluster is | |
5226 | * already computed earlier by ext4_get_group_no_and_offset() | |
0ba08517 | 5227 | */ |
913eed83 LC |
5228 | if (group == last_group) |
5229 | end = last_cluster; | |
7360d173 | 5230 | |
78944086 | 5231 | if (grp->bb_free >= minlen) { |
7137d7a4 | 5232 | cnt = ext4_trim_all_free(sb, group, first_cluster, |
913eed83 | 5233 | end, minlen); |
7360d173 LC |
5234 | if (cnt < 0) { |
5235 | ret = cnt; | |
7360d173 LC |
5236 | break; |
5237 | } | |
21e7fd22 | 5238 | trimmed += cnt; |
7360d173 | 5239 | } |
913eed83 LC |
5240 | |
5241 | /* | |
5242 | * For every group except the first one, we are sure | |
5243 | * that the first cluster to discard will be cluster #0. | |
5244 | */ | |
7137d7a4 | 5245 | first_cluster = 0; |
7360d173 | 5246 | } |
7360d173 | 5247 | |
3d56b8d2 TM |
5248 | if (!ret) |
5249 | atomic_set(&EXT4_SB(sb)->s_last_trim_minblks, minlen); | |
5250 | ||
22f10457 | 5251 | out: |
aaf7d73e | 5252 | range->len = EXT4_C2B(EXT4_SB(sb), trimmed) << sb->s_blocksize_bits; |
7360d173 LC |
5253 | return ret; |
5254 | } |