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Commit | Line | Data |
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1da177e4 | 1 | /* |
f07c2250 | 2 | * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
7b718769 | 3 | * All Rights Reserved. |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would 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. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
93c189c1 | 18 | #include "xfs.h" |
1da177e4 LT |
19 | #include <linux/stddef.h> |
20 | #include <linux/errno.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/vmalloc.h> | |
25 | #include <linux/bio.h> | |
26 | #include <linux/sysctl.h> | |
27 | #include <linux/proc_fs.h> | |
28 | #include <linux/workqueue.h> | |
29 | #include <linux/percpu.h> | |
30 | #include <linux/blkdev.h> | |
31 | #include <linux/hash.h> | |
4df08c52 | 32 | #include <linux/kthread.h> |
b20a3503 | 33 | #include <linux/migrate.h> |
3fcfab16 | 34 | #include <linux/backing-dev.h> |
7dfb7103 | 35 | #include <linux/freezer.h> |
089716aa | 36 | #include <linux/list_sort.h> |
1da177e4 | 37 | |
b7963133 CH |
38 | #include "xfs_sb.h" |
39 | #include "xfs_inum.h" | |
40 | #include "xfs_ag.h" | |
41 | #include "xfs_dmapi.h" | |
42 | #include "xfs_mount.h" | |
0b1b213f | 43 | #include "xfs_trace.h" |
b7963133 | 44 | |
7989cb8e | 45 | static kmem_zone_t *xfs_buf_zone; |
a6867a68 | 46 | STATIC int xfsbufd(void *); |
27496a8c | 47 | STATIC int xfsbufd_wakeup(int, gfp_t); |
ce8e922c | 48 | STATIC void xfs_buf_delwri_queue(xfs_buf_t *, int); |
8e1f936b RR |
49 | static struct shrinker xfs_buf_shake = { |
50 | .shrink = xfsbufd_wakeup, | |
51 | .seeks = DEFAULT_SEEKS, | |
52 | }; | |
23ea4032 | 53 | |
7989cb8e | 54 | static struct workqueue_struct *xfslogd_workqueue; |
0829c360 | 55 | struct workqueue_struct *xfsdatad_workqueue; |
c626d174 | 56 | struct workqueue_struct *xfsconvertd_workqueue; |
1da177e4 | 57 | |
ce8e922c NS |
58 | #ifdef XFS_BUF_LOCK_TRACKING |
59 | # define XB_SET_OWNER(bp) ((bp)->b_last_holder = current->pid) | |
60 | # define XB_CLEAR_OWNER(bp) ((bp)->b_last_holder = -1) | |
61 | # define XB_GET_OWNER(bp) ((bp)->b_last_holder) | |
1da177e4 | 62 | #else |
ce8e922c NS |
63 | # define XB_SET_OWNER(bp) do { } while (0) |
64 | # define XB_CLEAR_OWNER(bp) do { } while (0) | |
65 | # define XB_GET_OWNER(bp) do { } while (0) | |
1da177e4 LT |
66 | #endif |
67 | ||
ce8e922c NS |
68 | #define xb_to_gfp(flags) \ |
69 | ((((flags) & XBF_READ_AHEAD) ? __GFP_NORETRY : \ | |
70 | ((flags) & XBF_DONT_BLOCK) ? GFP_NOFS : GFP_KERNEL) | __GFP_NOWARN) | |
1da177e4 | 71 | |
ce8e922c NS |
72 | #define xb_to_km(flags) \ |
73 | (((flags) & XBF_DONT_BLOCK) ? KM_NOFS : KM_SLEEP) | |
1da177e4 | 74 | |
ce8e922c NS |
75 | #define xfs_buf_allocate(flags) \ |
76 | kmem_zone_alloc(xfs_buf_zone, xb_to_km(flags)) | |
77 | #define xfs_buf_deallocate(bp) \ | |
78 | kmem_zone_free(xfs_buf_zone, (bp)); | |
1da177e4 | 79 | |
73c77e2c JB |
80 | static inline int |
81 | xfs_buf_is_vmapped( | |
82 | struct xfs_buf *bp) | |
83 | { | |
84 | /* | |
85 | * Return true if the buffer is vmapped. | |
86 | * | |
87 | * The XBF_MAPPED flag is set if the buffer should be mapped, but the | |
88 | * code is clever enough to know it doesn't have to map a single page, | |
89 | * so the check has to be both for XBF_MAPPED and bp->b_page_count > 1. | |
90 | */ | |
91 | return (bp->b_flags & XBF_MAPPED) && bp->b_page_count > 1; | |
92 | } | |
93 | ||
94 | static inline int | |
95 | xfs_buf_vmap_len( | |
96 | struct xfs_buf *bp) | |
97 | { | |
98 | return (bp->b_page_count * PAGE_SIZE) - bp->b_offset; | |
99 | } | |
100 | ||
1da177e4 | 101 | /* |
ce8e922c | 102 | * Page Region interfaces. |
1da177e4 | 103 | * |
ce8e922c NS |
104 | * For pages in filesystems where the blocksize is smaller than the |
105 | * pagesize, we use the page->private field (long) to hold a bitmap | |
106 | * of uptodate regions within the page. | |
1da177e4 | 107 | * |
ce8e922c | 108 | * Each such region is "bytes per page / bits per long" bytes long. |
1da177e4 | 109 | * |
ce8e922c NS |
110 | * NBPPR == number-of-bytes-per-page-region |
111 | * BTOPR == bytes-to-page-region (rounded up) | |
112 | * BTOPRT == bytes-to-page-region-truncated (rounded down) | |
1da177e4 LT |
113 | */ |
114 | #if (BITS_PER_LONG == 32) | |
115 | #define PRSHIFT (PAGE_CACHE_SHIFT - 5) /* (32 == 1<<5) */ | |
116 | #elif (BITS_PER_LONG == 64) | |
117 | #define PRSHIFT (PAGE_CACHE_SHIFT - 6) /* (64 == 1<<6) */ | |
118 | #else | |
119 | #error BITS_PER_LONG must be 32 or 64 | |
120 | #endif | |
121 | #define NBPPR (PAGE_CACHE_SIZE/BITS_PER_LONG) | |
122 | #define BTOPR(b) (((unsigned int)(b) + (NBPPR - 1)) >> PRSHIFT) | |
123 | #define BTOPRT(b) (((unsigned int)(b) >> PRSHIFT)) | |
124 | ||
125 | STATIC unsigned long | |
126 | page_region_mask( | |
127 | size_t offset, | |
128 | size_t length) | |
129 | { | |
130 | unsigned long mask; | |
131 | int first, final; | |
132 | ||
133 | first = BTOPR(offset); | |
134 | final = BTOPRT(offset + length - 1); | |
135 | first = min(first, final); | |
136 | ||
137 | mask = ~0UL; | |
138 | mask <<= BITS_PER_LONG - (final - first); | |
139 | mask >>= BITS_PER_LONG - (final); | |
140 | ||
141 | ASSERT(offset + length <= PAGE_CACHE_SIZE); | |
142 | ASSERT((final - first) < BITS_PER_LONG && (final - first) >= 0); | |
143 | ||
144 | return mask; | |
145 | } | |
146 | ||
b8f82a4a | 147 | STATIC void |
1da177e4 LT |
148 | set_page_region( |
149 | struct page *page, | |
150 | size_t offset, | |
151 | size_t length) | |
152 | { | |
4c21e2f2 HD |
153 | set_page_private(page, |
154 | page_private(page) | page_region_mask(offset, length)); | |
155 | if (page_private(page) == ~0UL) | |
1da177e4 LT |
156 | SetPageUptodate(page); |
157 | } | |
158 | ||
b8f82a4a | 159 | STATIC int |
1da177e4 LT |
160 | test_page_region( |
161 | struct page *page, | |
162 | size_t offset, | |
163 | size_t length) | |
164 | { | |
165 | unsigned long mask = page_region_mask(offset, length); | |
166 | ||
4c21e2f2 | 167 | return (mask && (page_private(page) & mask) == mask); |
1da177e4 LT |
168 | } |
169 | ||
1da177e4 | 170 | /* |
ce8e922c | 171 | * Internal xfs_buf_t object manipulation |
1da177e4 LT |
172 | */ |
173 | ||
174 | STATIC void | |
ce8e922c NS |
175 | _xfs_buf_initialize( |
176 | xfs_buf_t *bp, | |
1da177e4 | 177 | xfs_buftarg_t *target, |
204ab25f | 178 | xfs_off_t range_base, |
1da177e4 | 179 | size_t range_length, |
ce8e922c | 180 | xfs_buf_flags_t flags) |
1da177e4 LT |
181 | { |
182 | /* | |
ce8e922c | 183 | * We don't want certain flags to appear in b_flags. |
1da177e4 | 184 | */ |
ce8e922c NS |
185 | flags &= ~(XBF_LOCK|XBF_MAPPED|XBF_DONT_BLOCK|XBF_READ_AHEAD); |
186 | ||
187 | memset(bp, 0, sizeof(xfs_buf_t)); | |
188 | atomic_set(&bp->b_hold, 1); | |
b4dd330b | 189 | init_completion(&bp->b_iowait); |
ce8e922c NS |
190 | INIT_LIST_HEAD(&bp->b_list); |
191 | INIT_LIST_HEAD(&bp->b_hash_list); | |
192 | init_MUTEX_LOCKED(&bp->b_sema); /* held, no waiters */ | |
193 | XB_SET_OWNER(bp); | |
194 | bp->b_target = target; | |
195 | bp->b_file_offset = range_base; | |
1da177e4 LT |
196 | /* |
197 | * Set buffer_length and count_desired to the same value initially. | |
198 | * I/O routines should use count_desired, which will be the same in | |
199 | * most cases but may be reset (e.g. XFS recovery). | |
200 | */ | |
ce8e922c NS |
201 | bp->b_buffer_length = bp->b_count_desired = range_length; |
202 | bp->b_flags = flags; | |
203 | bp->b_bn = XFS_BUF_DADDR_NULL; | |
204 | atomic_set(&bp->b_pin_count, 0); | |
205 | init_waitqueue_head(&bp->b_waiters); | |
206 | ||
207 | XFS_STATS_INC(xb_create); | |
0b1b213f CH |
208 | |
209 | trace_xfs_buf_init(bp, _RET_IP_); | |
1da177e4 LT |
210 | } |
211 | ||
212 | /* | |
ce8e922c NS |
213 | * Allocate a page array capable of holding a specified number |
214 | * of pages, and point the page buf at it. | |
1da177e4 LT |
215 | */ |
216 | STATIC int | |
ce8e922c NS |
217 | _xfs_buf_get_pages( |
218 | xfs_buf_t *bp, | |
1da177e4 | 219 | int page_count, |
ce8e922c | 220 | xfs_buf_flags_t flags) |
1da177e4 LT |
221 | { |
222 | /* Make sure that we have a page list */ | |
ce8e922c NS |
223 | if (bp->b_pages == NULL) { |
224 | bp->b_offset = xfs_buf_poff(bp->b_file_offset); | |
225 | bp->b_page_count = page_count; | |
226 | if (page_count <= XB_PAGES) { | |
227 | bp->b_pages = bp->b_page_array; | |
1da177e4 | 228 | } else { |
ce8e922c NS |
229 | bp->b_pages = kmem_alloc(sizeof(struct page *) * |
230 | page_count, xb_to_km(flags)); | |
231 | if (bp->b_pages == NULL) | |
1da177e4 LT |
232 | return -ENOMEM; |
233 | } | |
ce8e922c | 234 | memset(bp->b_pages, 0, sizeof(struct page *) * page_count); |
1da177e4 LT |
235 | } |
236 | return 0; | |
237 | } | |
238 | ||
239 | /* | |
ce8e922c | 240 | * Frees b_pages if it was allocated. |
1da177e4 LT |
241 | */ |
242 | STATIC void | |
ce8e922c | 243 | _xfs_buf_free_pages( |
1da177e4 LT |
244 | xfs_buf_t *bp) |
245 | { | |
ce8e922c | 246 | if (bp->b_pages != bp->b_page_array) { |
f0e2d93c | 247 | kmem_free(bp->b_pages); |
3fc98b1a | 248 | bp->b_pages = NULL; |
1da177e4 LT |
249 | } |
250 | } | |
251 | ||
252 | /* | |
253 | * Releases the specified buffer. | |
254 | * | |
255 | * The modification state of any associated pages is left unchanged. | |
ce8e922c | 256 | * The buffer most not be on any hash - use xfs_buf_rele instead for |
1da177e4 LT |
257 | * hashed and refcounted buffers |
258 | */ | |
259 | void | |
ce8e922c | 260 | xfs_buf_free( |
1da177e4 LT |
261 | xfs_buf_t *bp) |
262 | { | |
0b1b213f | 263 | trace_xfs_buf_free(bp, _RET_IP_); |
1da177e4 | 264 | |
ce8e922c | 265 | ASSERT(list_empty(&bp->b_hash_list)); |
1da177e4 | 266 | |
1fa40b01 | 267 | if (bp->b_flags & (_XBF_PAGE_CACHE|_XBF_PAGES)) { |
1da177e4 LT |
268 | uint i; |
269 | ||
73c77e2c | 270 | if (xfs_buf_is_vmapped(bp)) |
cd9640a7 | 271 | vunmap(bp->b_addr - bp->b_offset); |
1da177e4 | 272 | |
948ecdb4 NS |
273 | for (i = 0; i < bp->b_page_count; i++) { |
274 | struct page *page = bp->b_pages[i]; | |
275 | ||
1fa40b01 CH |
276 | if (bp->b_flags & _XBF_PAGE_CACHE) |
277 | ASSERT(!PagePrivate(page)); | |
948ecdb4 NS |
278 | page_cache_release(page); |
279 | } | |
1da177e4 | 280 | } |
3fc98b1a | 281 | _xfs_buf_free_pages(bp); |
ce8e922c | 282 | xfs_buf_deallocate(bp); |
1da177e4 LT |
283 | } |
284 | ||
285 | /* | |
286 | * Finds all pages for buffer in question and builds it's page list. | |
287 | */ | |
288 | STATIC int | |
ce8e922c | 289 | _xfs_buf_lookup_pages( |
1da177e4 LT |
290 | xfs_buf_t *bp, |
291 | uint flags) | |
292 | { | |
ce8e922c NS |
293 | struct address_space *mapping = bp->b_target->bt_mapping; |
294 | size_t blocksize = bp->b_target->bt_bsize; | |
295 | size_t size = bp->b_count_desired; | |
1da177e4 | 296 | size_t nbytes, offset; |
ce8e922c | 297 | gfp_t gfp_mask = xb_to_gfp(flags); |
1da177e4 LT |
298 | unsigned short page_count, i; |
299 | pgoff_t first; | |
204ab25f | 300 | xfs_off_t end; |
1da177e4 LT |
301 | int error; |
302 | ||
ce8e922c NS |
303 | end = bp->b_file_offset + bp->b_buffer_length; |
304 | page_count = xfs_buf_btoc(end) - xfs_buf_btoct(bp->b_file_offset); | |
1da177e4 | 305 | |
ce8e922c | 306 | error = _xfs_buf_get_pages(bp, page_count, flags); |
1da177e4 LT |
307 | if (unlikely(error)) |
308 | return error; | |
ce8e922c | 309 | bp->b_flags |= _XBF_PAGE_CACHE; |
1da177e4 | 310 | |
ce8e922c NS |
311 | offset = bp->b_offset; |
312 | first = bp->b_file_offset >> PAGE_CACHE_SHIFT; | |
1da177e4 | 313 | |
ce8e922c | 314 | for (i = 0; i < bp->b_page_count; i++) { |
1da177e4 LT |
315 | struct page *page; |
316 | uint retries = 0; | |
317 | ||
318 | retry: | |
319 | page = find_or_create_page(mapping, first + i, gfp_mask); | |
320 | if (unlikely(page == NULL)) { | |
ce8e922c NS |
321 | if (flags & XBF_READ_AHEAD) { |
322 | bp->b_page_count = i; | |
6ab455ee CH |
323 | for (i = 0; i < bp->b_page_count; i++) |
324 | unlock_page(bp->b_pages[i]); | |
1da177e4 LT |
325 | return -ENOMEM; |
326 | } | |
327 | ||
328 | /* | |
329 | * This could deadlock. | |
330 | * | |
331 | * But until all the XFS lowlevel code is revamped to | |
332 | * handle buffer allocation failures we can't do much. | |
333 | */ | |
334 | if (!(++retries % 100)) | |
335 | printk(KERN_ERR | |
336 | "XFS: possible memory allocation " | |
337 | "deadlock in %s (mode:0x%x)\n", | |
34a622b2 | 338 | __func__, gfp_mask); |
1da177e4 | 339 | |
ce8e922c | 340 | XFS_STATS_INC(xb_page_retries); |
23ea4032 | 341 | xfsbufd_wakeup(0, gfp_mask); |
8aa7e847 | 342 | congestion_wait(BLK_RW_ASYNC, HZ/50); |
1da177e4 LT |
343 | goto retry; |
344 | } | |
345 | ||
ce8e922c | 346 | XFS_STATS_INC(xb_page_found); |
1da177e4 LT |
347 | |
348 | nbytes = min_t(size_t, size, PAGE_CACHE_SIZE - offset); | |
349 | size -= nbytes; | |
350 | ||
948ecdb4 | 351 | ASSERT(!PagePrivate(page)); |
1da177e4 LT |
352 | if (!PageUptodate(page)) { |
353 | page_count--; | |
6ab455ee CH |
354 | if (blocksize >= PAGE_CACHE_SIZE) { |
355 | if (flags & XBF_READ) | |
356 | bp->b_flags |= _XBF_PAGE_LOCKED; | |
357 | } else if (!PagePrivate(page)) { | |
1da177e4 LT |
358 | if (test_page_region(page, offset, nbytes)) |
359 | page_count++; | |
360 | } | |
361 | } | |
362 | ||
ce8e922c | 363 | bp->b_pages[i] = page; |
1da177e4 LT |
364 | offset = 0; |
365 | } | |
366 | ||
6ab455ee CH |
367 | if (!(bp->b_flags & _XBF_PAGE_LOCKED)) { |
368 | for (i = 0; i < bp->b_page_count; i++) | |
369 | unlock_page(bp->b_pages[i]); | |
370 | } | |
371 | ||
ce8e922c NS |
372 | if (page_count == bp->b_page_count) |
373 | bp->b_flags |= XBF_DONE; | |
1da177e4 | 374 | |
1da177e4 LT |
375 | return error; |
376 | } | |
377 | ||
378 | /* | |
379 | * Map buffer into kernel address-space if nessecary. | |
380 | */ | |
381 | STATIC int | |
ce8e922c | 382 | _xfs_buf_map_pages( |
1da177e4 LT |
383 | xfs_buf_t *bp, |
384 | uint flags) | |
385 | { | |
386 | /* A single page buffer is always mappable */ | |
ce8e922c NS |
387 | if (bp->b_page_count == 1) { |
388 | bp->b_addr = page_address(bp->b_pages[0]) + bp->b_offset; | |
389 | bp->b_flags |= XBF_MAPPED; | |
390 | } else if (flags & XBF_MAPPED) { | |
cf7dab80 FB |
391 | bp->b_addr = vmap(bp->b_pages, bp->b_page_count, |
392 | VM_MAP, PAGE_KERNEL); | |
ce8e922c | 393 | if (unlikely(bp->b_addr == NULL)) |
1da177e4 | 394 | return -ENOMEM; |
ce8e922c NS |
395 | bp->b_addr += bp->b_offset; |
396 | bp->b_flags |= XBF_MAPPED; | |
1da177e4 LT |
397 | } |
398 | ||
399 | return 0; | |
400 | } | |
401 | ||
402 | /* | |
403 | * Finding and Reading Buffers | |
404 | */ | |
405 | ||
406 | /* | |
ce8e922c | 407 | * Look up, and creates if absent, a lockable buffer for |
1da177e4 LT |
408 | * a given range of an inode. The buffer is returned |
409 | * locked. If other overlapping buffers exist, they are | |
410 | * released before the new buffer is created and locked, | |
411 | * which may imply that this call will block until those buffers | |
412 | * are unlocked. No I/O is implied by this call. | |
413 | */ | |
414 | xfs_buf_t * | |
ce8e922c | 415 | _xfs_buf_find( |
1da177e4 | 416 | xfs_buftarg_t *btp, /* block device target */ |
204ab25f | 417 | xfs_off_t ioff, /* starting offset of range */ |
1da177e4 | 418 | size_t isize, /* length of range */ |
ce8e922c NS |
419 | xfs_buf_flags_t flags, |
420 | xfs_buf_t *new_bp) | |
1da177e4 | 421 | { |
204ab25f | 422 | xfs_off_t range_base; |
1da177e4 LT |
423 | size_t range_length; |
424 | xfs_bufhash_t *hash; | |
ce8e922c | 425 | xfs_buf_t *bp, *n; |
1da177e4 LT |
426 | |
427 | range_base = (ioff << BBSHIFT); | |
428 | range_length = (isize << BBSHIFT); | |
429 | ||
430 | /* Check for IOs smaller than the sector size / not sector aligned */ | |
ce8e922c | 431 | ASSERT(!(range_length < (1 << btp->bt_sshift))); |
204ab25f | 432 | ASSERT(!(range_base & (xfs_off_t)btp->bt_smask)); |
1da177e4 LT |
433 | |
434 | hash = &btp->bt_hash[hash_long((unsigned long)ioff, btp->bt_hashshift)]; | |
435 | ||
436 | spin_lock(&hash->bh_lock); | |
437 | ||
ce8e922c NS |
438 | list_for_each_entry_safe(bp, n, &hash->bh_list, b_hash_list) { |
439 | ASSERT(btp == bp->b_target); | |
440 | if (bp->b_file_offset == range_base && | |
441 | bp->b_buffer_length == range_length) { | |
1da177e4 | 442 | /* |
ce8e922c | 443 | * If we look at something, bring it to the |
1da177e4 LT |
444 | * front of the list for next time. |
445 | */ | |
ce8e922c NS |
446 | atomic_inc(&bp->b_hold); |
447 | list_move(&bp->b_hash_list, &hash->bh_list); | |
1da177e4 LT |
448 | goto found; |
449 | } | |
450 | } | |
451 | ||
452 | /* No match found */ | |
ce8e922c NS |
453 | if (new_bp) { |
454 | _xfs_buf_initialize(new_bp, btp, range_base, | |
1da177e4 | 455 | range_length, flags); |
ce8e922c NS |
456 | new_bp->b_hash = hash; |
457 | list_add(&new_bp->b_hash_list, &hash->bh_list); | |
1da177e4 | 458 | } else { |
ce8e922c | 459 | XFS_STATS_INC(xb_miss_locked); |
1da177e4 LT |
460 | } |
461 | ||
462 | spin_unlock(&hash->bh_lock); | |
ce8e922c | 463 | return new_bp; |
1da177e4 LT |
464 | |
465 | found: | |
466 | spin_unlock(&hash->bh_lock); | |
467 | ||
468 | /* Attempt to get the semaphore without sleeping, | |
469 | * if this does not work then we need to drop the | |
470 | * spinlock and do a hard attempt on the semaphore. | |
471 | */ | |
ce8e922c NS |
472 | if (down_trylock(&bp->b_sema)) { |
473 | if (!(flags & XBF_TRYLOCK)) { | |
1da177e4 | 474 | /* wait for buffer ownership */ |
ce8e922c NS |
475 | xfs_buf_lock(bp); |
476 | XFS_STATS_INC(xb_get_locked_waited); | |
1da177e4 LT |
477 | } else { |
478 | /* We asked for a trylock and failed, no need | |
479 | * to look at file offset and length here, we | |
ce8e922c NS |
480 | * know that this buffer at least overlaps our |
481 | * buffer and is locked, therefore our buffer | |
482 | * either does not exist, or is this buffer. | |
1da177e4 | 483 | */ |
ce8e922c NS |
484 | xfs_buf_rele(bp); |
485 | XFS_STATS_INC(xb_busy_locked); | |
486 | return NULL; | |
1da177e4 LT |
487 | } |
488 | } else { | |
489 | /* trylock worked */ | |
ce8e922c | 490 | XB_SET_OWNER(bp); |
1da177e4 LT |
491 | } |
492 | ||
ce8e922c NS |
493 | if (bp->b_flags & XBF_STALE) { |
494 | ASSERT((bp->b_flags & _XBF_DELWRI_Q) == 0); | |
495 | bp->b_flags &= XBF_MAPPED; | |
2f926587 | 496 | } |
0b1b213f CH |
497 | |
498 | trace_xfs_buf_find(bp, flags, _RET_IP_); | |
ce8e922c NS |
499 | XFS_STATS_INC(xb_get_locked); |
500 | return bp; | |
1da177e4 LT |
501 | } |
502 | ||
503 | /* | |
ce8e922c | 504 | * Assembles a buffer covering the specified range. |
1da177e4 LT |
505 | * Storage in memory for all portions of the buffer will be allocated, |
506 | * although backing storage may not be. | |
507 | */ | |
508 | xfs_buf_t * | |
6ad112bf | 509 | xfs_buf_get( |
1da177e4 | 510 | xfs_buftarg_t *target,/* target for buffer */ |
204ab25f | 511 | xfs_off_t ioff, /* starting offset of range */ |
1da177e4 | 512 | size_t isize, /* length of range */ |
ce8e922c | 513 | xfs_buf_flags_t flags) |
1da177e4 | 514 | { |
ce8e922c | 515 | xfs_buf_t *bp, *new_bp; |
1da177e4 LT |
516 | int error = 0, i; |
517 | ||
ce8e922c NS |
518 | new_bp = xfs_buf_allocate(flags); |
519 | if (unlikely(!new_bp)) | |
1da177e4 LT |
520 | return NULL; |
521 | ||
ce8e922c NS |
522 | bp = _xfs_buf_find(target, ioff, isize, flags, new_bp); |
523 | if (bp == new_bp) { | |
524 | error = _xfs_buf_lookup_pages(bp, flags); | |
1da177e4 LT |
525 | if (error) |
526 | goto no_buffer; | |
527 | } else { | |
ce8e922c NS |
528 | xfs_buf_deallocate(new_bp); |
529 | if (unlikely(bp == NULL)) | |
1da177e4 LT |
530 | return NULL; |
531 | } | |
532 | ||
ce8e922c NS |
533 | for (i = 0; i < bp->b_page_count; i++) |
534 | mark_page_accessed(bp->b_pages[i]); | |
1da177e4 | 535 | |
ce8e922c NS |
536 | if (!(bp->b_flags & XBF_MAPPED)) { |
537 | error = _xfs_buf_map_pages(bp, flags); | |
1da177e4 LT |
538 | if (unlikely(error)) { |
539 | printk(KERN_WARNING "%s: failed to map pages\n", | |
34a622b2 | 540 | __func__); |
1da177e4 LT |
541 | goto no_buffer; |
542 | } | |
543 | } | |
544 | ||
ce8e922c | 545 | XFS_STATS_INC(xb_get); |
1da177e4 LT |
546 | |
547 | /* | |
548 | * Always fill in the block number now, the mapped cases can do | |
549 | * their own overlay of this later. | |
550 | */ | |
ce8e922c NS |
551 | bp->b_bn = ioff; |
552 | bp->b_count_desired = bp->b_buffer_length; | |
1da177e4 | 553 | |
0b1b213f | 554 | trace_xfs_buf_get(bp, flags, _RET_IP_); |
ce8e922c | 555 | return bp; |
1da177e4 LT |
556 | |
557 | no_buffer: | |
ce8e922c NS |
558 | if (flags & (XBF_LOCK | XBF_TRYLOCK)) |
559 | xfs_buf_unlock(bp); | |
560 | xfs_buf_rele(bp); | |
1da177e4 LT |
561 | return NULL; |
562 | } | |
563 | ||
5d765b97 CH |
564 | STATIC int |
565 | _xfs_buf_read( | |
566 | xfs_buf_t *bp, | |
567 | xfs_buf_flags_t flags) | |
568 | { | |
569 | int status; | |
570 | ||
5d765b97 CH |
571 | ASSERT(!(flags & (XBF_DELWRI|XBF_WRITE))); |
572 | ASSERT(bp->b_bn != XFS_BUF_DADDR_NULL); | |
573 | ||
574 | bp->b_flags &= ~(XBF_WRITE | XBF_ASYNC | XBF_DELWRI | \ | |
575 | XBF_READ_AHEAD | _XBF_RUN_QUEUES); | |
576 | bp->b_flags |= flags & (XBF_READ | XBF_ASYNC | \ | |
577 | XBF_READ_AHEAD | _XBF_RUN_QUEUES); | |
578 | ||
579 | status = xfs_buf_iorequest(bp); | |
580 | if (!status && !(flags & XBF_ASYNC)) | |
581 | status = xfs_buf_iowait(bp); | |
582 | return status; | |
583 | } | |
584 | ||
1da177e4 | 585 | xfs_buf_t * |
6ad112bf | 586 | xfs_buf_read( |
1da177e4 | 587 | xfs_buftarg_t *target, |
204ab25f | 588 | xfs_off_t ioff, |
1da177e4 | 589 | size_t isize, |
ce8e922c | 590 | xfs_buf_flags_t flags) |
1da177e4 | 591 | { |
ce8e922c NS |
592 | xfs_buf_t *bp; |
593 | ||
594 | flags |= XBF_READ; | |
595 | ||
6ad112bf | 596 | bp = xfs_buf_get(target, ioff, isize, flags); |
ce8e922c | 597 | if (bp) { |
0b1b213f CH |
598 | trace_xfs_buf_read(bp, flags, _RET_IP_); |
599 | ||
ce8e922c | 600 | if (!XFS_BUF_ISDONE(bp)) { |
ce8e922c | 601 | XFS_STATS_INC(xb_get_read); |
5d765b97 | 602 | _xfs_buf_read(bp, flags); |
ce8e922c | 603 | } else if (flags & XBF_ASYNC) { |
1da177e4 LT |
604 | /* |
605 | * Read ahead call which is already satisfied, | |
606 | * drop the buffer | |
607 | */ | |
608 | goto no_buffer; | |
609 | } else { | |
1da177e4 | 610 | /* We do not want read in the flags */ |
ce8e922c | 611 | bp->b_flags &= ~XBF_READ; |
1da177e4 LT |
612 | } |
613 | } | |
614 | ||
ce8e922c | 615 | return bp; |
1da177e4 LT |
616 | |
617 | no_buffer: | |
ce8e922c NS |
618 | if (flags & (XBF_LOCK | XBF_TRYLOCK)) |
619 | xfs_buf_unlock(bp); | |
620 | xfs_buf_rele(bp); | |
1da177e4 LT |
621 | return NULL; |
622 | } | |
623 | ||
1da177e4 | 624 | /* |
ce8e922c NS |
625 | * If we are not low on memory then do the readahead in a deadlock |
626 | * safe manner. | |
1da177e4 LT |
627 | */ |
628 | void | |
ce8e922c | 629 | xfs_buf_readahead( |
1da177e4 | 630 | xfs_buftarg_t *target, |
204ab25f | 631 | xfs_off_t ioff, |
1da177e4 | 632 | size_t isize, |
ce8e922c | 633 | xfs_buf_flags_t flags) |
1da177e4 LT |
634 | { |
635 | struct backing_dev_info *bdi; | |
636 | ||
ce8e922c | 637 | bdi = target->bt_mapping->backing_dev_info; |
1da177e4 LT |
638 | if (bdi_read_congested(bdi)) |
639 | return; | |
640 | ||
ce8e922c | 641 | flags |= (XBF_TRYLOCK|XBF_ASYNC|XBF_READ_AHEAD); |
6ad112bf | 642 | xfs_buf_read(target, ioff, isize, flags); |
1da177e4 LT |
643 | } |
644 | ||
645 | xfs_buf_t * | |
ce8e922c | 646 | xfs_buf_get_empty( |
1da177e4 LT |
647 | size_t len, |
648 | xfs_buftarg_t *target) | |
649 | { | |
ce8e922c | 650 | xfs_buf_t *bp; |
1da177e4 | 651 | |
ce8e922c NS |
652 | bp = xfs_buf_allocate(0); |
653 | if (bp) | |
654 | _xfs_buf_initialize(bp, target, 0, len, 0); | |
655 | return bp; | |
1da177e4 LT |
656 | } |
657 | ||
658 | static inline struct page * | |
659 | mem_to_page( | |
660 | void *addr) | |
661 | { | |
9e2779fa | 662 | if ((!is_vmalloc_addr(addr))) { |
1da177e4 LT |
663 | return virt_to_page(addr); |
664 | } else { | |
665 | return vmalloc_to_page(addr); | |
666 | } | |
667 | } | |
668 | ||
669 | int | |
ce8e922c NS |
670 | xfs_buf_associate_memory( |
671 | xfs_buf_t *bp, | |
1da177e4 LT |
672 | void *mem, |
673 | size_t len) | |
674 | { | |
675 | int rval; | |
676 | int i = 0; | |
d1afb678 LM |
677 | unsigned long pageaddr; |
678 | unsigned long offset; | |
679 | size_t buflen; | |
1da177e4 LT |
680 | int page_count; |
681 | ||
d1afb678 LM |
682 | pageaddr = (unsigned long)mem & PAGE_CACHE_MASK; |
683 | offset = (unsigned long)mem - pageaddr; | |
684 | buflen = PAGE_CACHE_ALIGN(len + offset); | |
685 | page_count = buflen >> PAGE_CACHE_SHIFT; | |
1da177e4 LT |
686 | |
687 | /* Free any previous set of page pointers */ | |
ce8e922c NS |
688 | if (bp->b_pages) |
689 | _xfs_buf_free_pages(bp); | |
1da177e4 | 690 | |
ce8e922c NS |
691 | bp->b_pages = NULL; |
692 | bp->b_addr = mem; | |
1da177e4 | 693 | |
36fae17a | 694 | rval = _xfs_buf_get_pages(bp, page_count, XBF_DONT_BLOCK); |
1da177e4 LT |
695 | if (rval) |
696 | return rval; | |
697 | ||
ce8e922c | 698 | bp->b_offset = offset; |
d1afb678 LM |
699 | |
700 | for (i = 0; i < bp->b_page_count; i++) { | |
701 | bp->b_pages[i] = mem_to_page((void *)pageaddr); | |
702 | pageaddr += PAGE_CACHE_SIZE; | |
1da177e4 | 703 | } |
1da177e4 | 704 | |
d1afb678 LM |
705 | bp->b_count_desired = len; |
706 | bp->b_buffer_length = buflen; | |
ce8e922c | 707 | bp->b_flags |= XBF_MAPPED; |
6ab455ee | 708 | bp->b_flags &= ~_XBF_PAGE_LOCKED; |
1da177e4 LT |
709 | |
710 | return 0; | |
711 | } | |
712 | ||
713 | xfs_buf_t * | |
ce8e922c | 714 | xfs_buf_get_noaddr( |
1da177e4 LT |
715 | size_t len, |
716 | xfs_buftarg_t *target) | |
717 | { | |
1fa40b01 CH |
718 | unsigned long page_count = PAGE_ALIGN(len) >> PAGE_SHIFT; |
719 | int error, i; | |
1da177e4 | 720 | xfs_buf_t *bp; |
1da177e4 | 721 | |
ce8e922c | 722 | bp = xfs_buf_allocate(0); |
1da177e4 LT |
723 | if (unlikely(bp == NULL)) |
724 | goto fail; | |
ce8e922c | 725 | _xfs_buf_initialize(bp, target, 0, len, 0); |
1da177e4 | 726 | |
1fa40b01 CH |
727 | error = _xfs_buf_get_pages(bp, page_count, 0); |
728 | if (error) | |
1da177e4 LT |
729 | goto fail_free_buf; |
730 | ||
1fa40b01 CH |
731 | for (i = 0; i < page_count; i++) { |
732 | bp->b_pages[i] = alloc_page(GFP_KERNEL); | |
733 | if (!bp->b_pages[i]) | |
734 | goto fail_free_mem; | |
1da177e4 | 735 | } |
1fa40b01 | 736 | bp->b_flags |= _XBF_PAGES; |
1da177e4 | 737 | |
1fa40b01 CH |
738 | error = _xfs_buf_map_pages(bp, XBF_MAPPED); |
739 | if (unlikely(error)) { | |
740 | printk(KERN_WARNING "%s: failed to map pages\n", | |
34a622b2 | 741 | __func__); |
1da177e4 | 742 | goto fail_free_mem; |
1fa40b01 | 743 | } |
1da177e4 | 744 | |
ce8e922c | 745 | xfs_buf_unlock(bp); |
1da177e4 | 746 | |
0b1b213f | 747 | trace_xfs_buf_get_noaddr(bp, _RET_IP_); |
1da177e4 | 748 | return bp; |
1fa40b01 | 749 | |
1da177e4 | 750 | fail_free_mem: |
1fa40b01 CH |
751 | while (--i >= 0) |
752 | __free_page(bp->b_pages[i]); | |
ca165b88 | 753 | _xfs_buf_free_pages(bp); |
1da177e4 | 754 | fail_free_buf: |
ca165b88 | 755 | xfs_buf_deallocate(bp); |
1da177e4 LT |
756 | fail: |
757 | return NULL; | |
758 | } | |
759 | ||
760 | /* | |
1da177e4 LT |
761 | * Increment reference count on buffer, to hold the buffer concurrently |
762 | * with another thread which may release (free) the buffer asynchronously. | |
1da177e4 LT |
763 | * Must hold the buffer already to call this function. |
764 | */ | |
765 | void | |
ce8e922c NS |
766 | xfs_buf_hold( |
767 | xfs_buf_t *bp) | |
1da177e4 | 768 | { |
0b1b213f | 769 | trace_xfs_buf_hold(bp, _RET_IP_); |
ce8e922c | 770 | atomic_inc(&bp->b_hold); |
1da177e4 LT |
771 | } |
772 | ||
773 | /* | |
ce8e922c NS |
774 | * Releases a hold on the specified buffer. If the |
775 | * the hold count is 1, calls xfs_buf_free. | |
1da177e4 LT |
776 | */ |
777 | void | |
ce8e922c NS |
778 | xfs_buf_rele( |
779 | xfs_buf_t *bp) | |
1da177e4 | 780 | { |
ce8e922c | 781 | xfs_bufhash_t *hash = bp->b_hash; |
1da177e4 | 782 | |
0b1b213f | 783 | trace_xfs_buf_rele(bp, _RET_IP_); |
1da177e4 | 784 | |
fad3aa1e NS |
785 | if (unlikely(!hash)) { |
786 | ASSERT(!bp->b_relse); | |
787 | if (atomic_dec_and_test(&bp->b_hold)) | |
788 | xfs_buf_free(bp); | |
789 | return; | |
790 | } | |
791 | ||
3790689f | 792 | ASSERT(atomic_read(&bp->b_hold) > 0); |
ce8e922c NS |
793 | if (atomic_dec_and_lock(&bp->b_hold, &hash->bh_lock)) { |
794 | if (bp->b_relse) { | |
795 | atomic_inc(&bp->b_hold); | |
1da177e4 | 796 | spin_unlock(&hash->bh_lock); |
ce8e922c NS |
797 | (*(bp->b_relse)) (bp); |
798 | } else if (bp->b_flags & XBF_FS_MANAGED) { | |
1da177e4 | 799 | spin_unlock(&hash->bh_lock); |
1da177e4 | 800 | } else { |
ce8e922c NS |
801 | ASSERT(!(bp->b_flags & (XBF_DELWRI|_XBF_DELWRI_Q))); |
802 | list_del_init(&bp->b_hash_list); | |
1da177e4 | 803 | spin_unlock(&hash->bh_lock); |
ce8e922c | 804 | xfs_buf_free(bp); |
1da177e4 LT |
805 | } |
806 | } | |
807 | } | |
808 | ||
809 | ||
810 | /* | |
811 | * Mutual exclusion on buffers. Locking model: | |
812 | * | |
813 | * Buffers associated with inodes for which buffer locking | |
814 | * is not enabled are not protected by semaphores, and are | |
815 | * assumed to be exclusively owned by the caller. There is a | |
816 | * spinlock in the buffer, used by the caller when concurrent | |
817 | * access is possible. | |
818 | */ | |
819 | ||
820 | /* | |
ce8e922c NS |
821 | * Locks a buffer object, if it is not already locked. |
822 | * Note that this in no way locks the underlying pages, so it is only | |
823 | * useful for synchronizing concurrent use of buffer objects, not for | |
824 | * synchronizing independent access to the underlying pages. | |
1da177e4 LT |
825 | */ |
826 | int | |
ce8e922c NS |
827 | xfs_buf_cond_lock( |
828 | xfs_buf_t *bp) | |
1da177e4 LT |
829 | { |
830 | int locked; | |
831 | ||
ce8e922c | 832 | locked = down_trylock(&bp->b_sema) == 0; |
0b1b213f | 833 | if (locked) |
ce8e922c | 834 | XB_SET_OWNER(bp); |
0b1b213f CH |
835 | |
836 | trace_xfs_buf_cond_lock(bp, _RET_IP_); | |
ce8e922c | 837 | return locked ? 0 : -EBUSY; |
1da177e4 LT |
838 | } |
839 | ||
1da177e4 | 840 | int |
ce8e922c NS |
841 | xfs_buf_lock_value( |
842 | xfs_buf_t *bp) | |
1da177e4 | 843 | { |
adaa693b | 844 | return bp->b_sema.count; |
1da177e4 | 845 | } |
1da177e4 LT |
846 | |
847 | /* | |
ce8e922c NS |
848 | * Locks a buffer object. |
849 | * Note that this in no way locks the underlying pages, so it is only | |
850 | * useful for synchronizing concurrent use of buffer objects, not for | |
851 | * synchronizing independent access to the underlying pages. | |
1da177e4 | 852 | */ |
ce8e922c NS |
853 | void |
854 | xfs_buf_lock( | |
855 | xfs_buf_t *bp) | |
1da177e4 | 856 | { |
0b1b213f CH |
857 | trace_xfs_buf_lock(bp, _RET_IP_); |
858 | ||
ce8e922c NS |
859 | if (atomic_read(&bp->b_io_remaining)) |
860 | blk_run_address_space(bp->b_target->bt_mapping); | |
861 | down(&bp->b_sema); | |
862 | XB_SET_OWNER(bp); | |
0b1b213f CH |
863 | |
864 | trace_xfs_buf_lock_done(bp, _RET_IP_); | |
1da177e4 LT |
865 | } |
866 | ||
867 | /* | |
ce8e922c | 868 | * Releases the lock on the buffer object. |
2f926587 | 869 | * If the buffer is marked delwri but is not queued, do so before we |
ce8e922c | 870 | * unlock the buffer as we need to set flags correctly. We also need to |
2f926587 DC |
871 | * take a reference for the delwri queue because the unlocker is going to |
872 | * drop their's and they don't know we just queued it. | |
1da177e4 LT |
873 | */ |
874 | void | |
ce8e922c NS |
875 | xfs_buf_unlock( |
876 | xfs_buf_t *bp) | |
1da177e4 | 877 | { |
ce8e922c NS |
878 | if ((bp->b_flags & (XBF_DELWRI|_XBF_DELWRI_Q)) == XBF_DELWRI) { |
879 | atomic_inc(&bp->b_hold); | |
880 | bp->b_flags |= XBF_ASYNC; | |
881 | xfs_buf_delwri_queue(bp, 0); | |
2f926587 DC |
882 | } |
883 | ||
ce8e922c NS |
884 | XB_CLEAR_OWNER(bp); |
885 | up(&bp->b_sema); | |
0b1b213f CH |
886 | |
887 | trace_xfs_buf_unlock(bp, _RET_IP_); | |
1da177e4 LT |
888 | } |
889 | ||
890 | ||
891 | /* | |
892 | * Pinning Buffer Storage in Memory | |
ce8e922c | 893 | * Ensure that no attempt to force a buffer to disk will succeed. |
1da177e4 LT |
894 | */ |
895 | void | |
ce8e922c NS |
896 | xfs_buf_pin( |
897 | xfs_buf_t *bp) | |
1da177e4 | 898 | { |
0b1b213f | 899 | trace_xfs_buf_pin(bp, _RET_IP_); |
ce8e922c | 900 | atomic_inc(&bp->b_pin_count); |
1da177e4 LT |
901 | } |
902 | ||
1da177e4 | 903 | void |
ce8e922c NS |
904 | xfs_buf_unpin( |
905 | xfs_buf_t *bp) | |
1da177e4 | 906 | { |
0b1b213f CH |
907 | trace_xfs_buf_unpin(bp, _RET_IP_); |
908 | ||
ce8e922c NS |
909 | if (atomic_dec_and_test(&bp->b_pin_count)) |
910 | wake_up_all(&bp->b_waiters); | |
1da177e4 LT |
911 | } |
912 | ||
913 | int | |
ce8e922c NS |
914 | xfs_buf_ispin( |
915 | xfs_buf_t *bp) | |
1da177e4 | 916 | { |
ce8e922c | 917 | return atomic_read(&bp->b_pin_count); |
1da177e4 LT |
918 | } |
919 | ||
ce8e922c NS |
920 | STATIC void |
921 | xfs_buf_wait_unpin( | |
922 | xfs_buf_t *bp) | |
1da177e4 LT |
923 | { |
924 | DECLARE_WAITQUEUE (wait, current); | |
925 | ||
ce8e922c | 926 | if (atomic_read(&bp->b_pin_count) == 0) |
1da177e4 LT |
927 | return; |
928 | ||
ce8e922c | 929 | add_wait_queue(&bp->b_waiters, &wait); |
1da177e4 LT |
930 | for (;;) { |
931 | set_current_state(TASK_UNINTERRUPTIBLE); | |
ce8e922c | 932 | if (atomic_read(&bp->b_pin_count) == 0) |
1da177e4 | 933 | break; |
ce8e922c NS |
934 | if (atomic_read(&bp->b_io_remaining)) |
935 | blk_run_address_space(bp->b_target->bt_mapping); | |
1da177e4 LT |
936 | schedule(); |
937 | } | |
ce8e922c | 938 | remove_wait_queue(&bp->b_waiters, &wait); |
1da177e4 LT |
939 | set_current_state(TASK_RUNNING); |
940 | } | |
941 | ||
942 | /* | |
943 | * Buffer Utility Routines | |
944 | */ | |
945 | ||
1da177e4 | 946 | STATIC void |
ce8e922c | 947 | xfs_buf_iodone_work( |
c4028958 | 948 | struct work_struct *work) |
1da177e4 | 949 | { |
c4028958 DH |
950 | xfs_buf_t *bp = |
951 | container_of(work, xfs_buf_t, b_iodone_work); | |
1da177e4 | 952 | |
0bfefc46 DC |
953 | /* |
954 | * We can get an EOPNOTSUPP to ordered writes. Here we clear the | |
955 | * ordered flag and reissue them. Because we can't tell the higher | |
956 | * layers directly that they should not issue ordered I/O anymore, they | |
73f6aa4d | 957 | * need to check if the _XFS_BARRIER_FAILED flag was set during I/O completion. |
0bfefc46 DC |
958 | */ |
959 | if ((bp->b_error == EOPNOTSUPP) && | |
960 | (bp->b_flags & (XBF_ORDERED|XBF_ASYNC)) == (XBF_ORDERED|XBF_ASYNC)) { | |
0b1b213f | 961 | trace_xfs_buf_ordered_retry(bp, _RET_IP_); |
0bfefc46 | 962 | bp->b_flags &= ~XBF_ORDERED; |
73f6aa4d | 963 | bp->b_flags |= _XFS_BARRIER_FAILED; |
0bfefc46 DC |
964 | xfs_buf_iorequest(bp); |
965 | } else if (bp->b_iodone) | |
ce8e922c NS |
966 | (*(bp->b_iodone))(bp); |
967 | else if (bp->b_flags & XBF_ASYNC) | |
1da177e4 LT |
968 | xfs_buf_relse(bp); |
969 | } | |
970 | ||
971 | void | |
ce8e922c NS |
972 | xfs_buf_ioend( |
973 | xfs_buf_t *bp, | |
1da177e4 LT |
974 | int schedule) |
975 | { | |
0b1b213f CH |
976 | trace_xfs_buf_iodone(bp, _RET_IP_); |
977 | ||
77be55a5 | 978 | bp->b_flags &= ~(XBF_READ | XBF_WRITE | XBF_READ_AHEAD); |
ce8e922c NS |
979 | if (bp->b_error == 0) |
980 | bp->b_flags |= XBF_DONE; | |
1da177e4 | 981 | |
ce8e922c | 982 | if ((bp->b_iodone) || (bp->b_flags & XBF_ASYNC)) { |
1da177e4 | 983 | if (schedule) { |
c4028958 | 984 | INIT_WORK(&bp->b_iodone_work, xfs_buf_iodone_work); |
ce8e922c | 985 | queue_work(xfslogd_workqueue, &bp->b_iodone_work); |
1da177e4 | 986 | } else { |
c4028958 | 987 | xfs_buf_iodone_work(&bp->b_iodone_work); |
1da177e4 LT |
988 | } |
989 | } else { | |
b4dd330b | 990 | complete(&bp->b_iowait); |
1da177e4 LT |
991 | } |
992 | } | |
993 | ||
1da177e4 | 994 | void |
ce8e922c NS |
995 | xfs_buf_ioerror( |
996 | xfs_buf_t *bp, | |
997 | int error) | |
1da177e4 LT |
998 | { |
999 | ASSERT(error >= 0 && error <= 0xffff); | |
ce8e922c | 1000 | bp->b_error = (unsigned short)error; |
0b1b213f | 1001 | trace_xfs_buf_ioerror(bp, error, _RET_IP_); |
1da177e4 LT |
1002 | } |
1003 | ||
1da177e4 | 1004 | int |
64e0bc7d CH |
1005 | xfs_bwrite( |
1006 | struct xfs_mount *mp, | |
5d765b97 | 1007 | struct xfs_buf *bp) |
1da177e4 | 1008 | { |
64e0bc7d CH |
1009 | int iowait = (bp->b_flags & XBF_ASYNC) == 0; |
1010 | int error = 0; | |
1da177e4 | 1011 | |
64e0bc7d CH |
1012 | bp->b_strat = xfs_bdstrat_cb; |
1013 | bp->b_mount = mp; | |
1014 | bp->b_flags |= XBF_WRITE; | |
1015 | if (!iowait) | |
1016 | bp->b_flags |= _XBF_RUN_QUEUES; | |
1da177e4 | 1017 | |
5d765b97 | 1018 | xfs_buf_delwri_dequeue(bp); |
64e0bc7d | 1019 | xfs_buf_iostrategy(bp); |
1da177e4 | 1020 | |
64e0bc7d CH |
1021 | if (iowait) { |
1022 | error = xfs_buf_iowait(bp); | |
1023 | if (error) | |
1024 | xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR); | |
1025 | xfs_buf_relse(bp); | |
1026 | } | |
1da177e4 | 1027 | |
64e0bc7d | 1028 | return error; |
5d765b97 | 1029 | } |
1da177e4 | 1030 | |
5d765b97 CH |
1031 | void |
1032 | xfs_bdwrite( | |
1033 | void *mp, | |
1034 | struct xfs_buf *bp) | |
1035 | { | |
0b1b213f | 1036 | trace_xfs_buf_bdwrite(bp, _RET_IP_); |
1da177e4 | 1037 | |
5d765b97 | 1038 | bp->b_strat = xfs_bdstrat_cb; |
15ac08a8 | 1039 | bp->b_mount = mp; |
1da177e4 | 1040 | |
5d765b97 CH |
1041 | bp->b_flags &= ~XBF_READ; |
1042 | bp->b_flags |= (XBF_DELWRI | XBF_ASYNC); | |
1043 | ||
1044 | xfs_buf_delwri_queue(bp, 1); | |
1da177e4 LT |
1045 | } |
1046 | ||
4e23471a CH |
1047 | /* |
1048 | * Called when we want to stop a buffer from getting written or read. | |
1049 | * We attach the EIO error, muck with its flags, and call biodone | |
1050 | * so that the proper iodone callbacks get called. | |
1051 | */ | |
1052 | STATIC int | |
1053 | xfs_bioerror( | |
1054 | xfs_buf_t *bp) | |
1055 | { | |
1056 | #ifdef XFSERRORDEBUG | |
1057 | ASSERT(XFS_BUF_ISREAD(bp) || bp->b_iodone); | |
1058 | #endif | |
1059 | ||
1060 | /* | |
1061 | * No need to wait until the buffer is unpinned, we aren't flushing it. | |
1062 | */ | |
1063 | XFS_BUF_ERROR(bp, EIO); | |
1064 | ||
1065 | /* | |
1066 | * We're calling biodone, so delete XBF_DONE flag. | |
1067 | */ | |
1068 | XFS_BUF_UNREAD(bp); | |
1069 | XFS_BUF_UNDELAYWRITE(bp); | |
1070 | XFS_BUF_UNDONE(bp); | |
1071 | XFS_BUF_STALE(bp); | |
1072 | ||
1073 | XFS_BUF_CLR_BDSTRAT_FUNC(bp); | |
1074 | xfs_biodone(bp); | |
1075 | ||
1076 | return EIO; | |
1077 | } | |
1078 | ||
1079 | /* | |
1080 | * Same as xfs_bioerror, except that we are releasing the buffer | |
1081 | * here ourselves, and avoiding the biodone call. | |
1082 | * This is meant for userdata errors; metadata bufs come with | |
1083 | * iodone functions attached, so that we can track down errors. | |
1084 | */ | |
1085 | STATIC int | |
1086 | xfs_bioerror_relse( | |
1087 | struct xfs_buf *bp) | |
1088 | { | |
1089 | int64_t fl = XFS_BUF_BFLAGS(bp); | |
1090 | /* | |
1091 | * No need to wait until the buffer is unpinned. | |
1092 | * We aren't flushing it. | |
1093 | * | |
1094 | * chunkhold expects B_DONE to be set, whether | |
1095 | * we actually finish the I/O or not. We don't want to | |
1096 | * change that interface. | |
1097 | */ | |
1098 | XFS_BUF_UNREAD(bp); | |
1099 | XFS_BUF_UNDELAYWRITE(bp); | |
1100 | XFS_BUF_DONE(bp); | |
1101 | XFS_BUF_STALE(bp); | |
1102 | XFS_BUF_CLR_IODONE_FUNC(bp); | |
1103 | XFS_BUF_CLR_BDSTRAT_FUNC(bp); | |
0cadda1c | 1104 | if (!(fl & XBF_ASYNC)) { |
4e23471a CH |
1105 | /* |
1106 | * Mark b_error and B_ERROR _both_. | |
1107 | * Lot's of chunkcache code assumes that. | |
1108 | * There's no reason to mark error for | |
1109 | * ASYNC buffers. | |
1110 | */ | |
1111 | XFS_BUF_ERROR(bp, EIO); | |
1112 | XFS_BUF_FINISH_IOWAIT(bp); | |
1113 | } else { | |
1114 | xfs_buf_relse(bp); | |
1115 | } | |
1116 | ||
1117 | return EIO; | |
1118 | } | |
1119 | ||
1120 | ||
1121 | /* | |
1122 | * All xfs metadata buffers except log state machine buffers | |
1123 | * get this attached as their b_bdstrat callback function. | |
1124 | * This is so that we can catch a buffer | |
1125 | * after prematurely unpinning it to forcibly shutdown the filesystem. | |
1126 | */ | |
1127 | int | |
1128 | xfs_bdstrat_cb( | |
1129 | struct xfs_buf *bp) | |
1130 | { | |
1131 | if (XFS_FORCED_SHUTDOWN(bp->b_mount)) { | |
1132 | trace_xfs_bdstrat_shut(bp, _RET_IP_); | |
1133 | /* | |
1134 | * Metadata write that didn't get logged but | |
1135 | * written delayed anyway. These aren't associated | |
1136 | * with a transaction, and can be ignored. | |
1137 | */ | |
1138 | if (!bp->b_iodone && !XFS_BUF_ISREAD(bp)) | |
1139 | return xfs_bioerror_relse(bp); | |
1140 | else | |
1141 | return xfs_bioerror(bp); | |
1142 | } | |
1143 | ||
1144 | xfs_buf_iorequest(bp); | |
1145 | return 0; | |
1146 | } | |
1147 | ||
1148 | /* | |
1149 | * Wrapper around bdstrat so that we can stop data from going to disk in case | |
1150 | * we are shutting down the filesystem. Typically user data goes thru this | |
1151 | * path; one of the exceptions is the superblock. | |
1152 | */ | |
1153 | void | |
1154 | xfsbdstrat( | |
1155 | struct xfs_mount *mp, | |
1156 | struct xfs_buf *bp) | |
1157 | { | |
1158 | if (XFS_FORCED_SHUTDOWN(mp)) { | |
1159 | trace_xfs_bdstrat_shut(bp, _RET_IP_); | |
1160 | xfs_bioerror_relse(bp); | |
1161 | return; | |
1162 | } | |
1163 | ||
1164 | xfs_buf_iorequest(bp); | |
1165 | } | |
1166 | ||
b8f82a4a | 1167 | STATIC void |
ce8e922c NS |
1168 | _xfs_buf_ioend( |
1169 | xfs_buf_t *bp, | |
1da177e4 LT |
1170 | int schedule) |
1171 | { | |
6ab455ee CH |
1172 | if (atomic_dec_and_test(&bp->b_io_remaining) == 1) { |
1173 | bp->b_flags &= ~_XBF_PAGE_LOCKED; | |
ce8e922c | 1174 | xfs_buf_ioend(bp, schedule); |
6ab455ee | 1175 | } |
1da177e4 LT |
1176 | } |
1177 | ||
782e3b3b | 1178 | STATIC void |
ce8e922c | 1179 | xfs_buf_bio_end_io( |
1da177e4 | 1180 | struct bio *bio, |
1da177e4 LT |
1181 | int error) |
1182 | { | |
ce8e922c NS |
1183 | xfs_buf_t *bp = (xfs_buf_t *)bio->bi_private; |
1184 | unsigned int blocksize = bp->b_target->bt_bsize; | |
eedb5530 | 1185 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
1da177e4 | 1186 | |
cfbe5267 | 1187 | xfs_buf_ioerror(bp, -error); |
1da177e4 | 1188 | |
73c77e2c JB |
1189 | if (!error && xfs_buf_is_vmapped(bp) && (bp->b_flags & XBF_READ)) |
1190 | invalidate_kernel_vmap_range(bp->b_addr, xfs_buf_vmap_len(bp)); | |
1191 | ||
eedb5530 | 1192 | do { |
1da177e4 LT |
1193 | struct page *page = bvec->bv_page; |
1194 | ||
948ecdb4 | 1195 | ASSERT(!PagePrivate(page)); |
ce8e922c NS |
1196 | if (unlikely(bp->b_error)) { |
1197 | if (bp->b_flags & XBF_READ) | |
eedb5530 | 1198 | ClearPageUptodate(page); |
ce8e922c | 1199 | } else if (blocksize >= PAGE_CACHE_SIZE) { |
1da177e4 LT |
1200 | SetPageUptodate(page); |
1201 | } else if (!PagePrivate(page) && | |
ce8e922c | 1202 | (bp->b_flags & _XBF_PAGE_CACHE)) { |
1da177e4 LT |
1203 | set_page_region(page, bvec->bv_offset, bvec->bv_len); |
1204 | } | |
1205 | ||
eedb5530 NS |
1206 | if (--bvec >= bio->bi_io_vec) |
1207 | prefetchw(&bvec->bv_page->flags); | |
6ab455ee CH |
1208 | |
1209 | if (bp->b_flags & _XBF_PAGE_LOCKED) | |
1210 | unlock_page(page); | |
eedb5530 | 1211 | } while (bvec >= bio->bi_io_vec); |
1da177e4 | 1212 | |
ce8e922c | 1213 | _xfs_buf_ioend(bp, 1); |
1da177e4 | 1214 | bio_put(bio); |
1da177e4 LT |
1215 | } |
1216 | ||
1217 | STATIC void | |
ce8e922c NS |
1218 | _xfs_buf_ioapply( |
1219 | xfs_buf_t *bp) | |
1da177e4 | 1220 | { |
a9759f2d | 1221 | int rw, map_i, total_nr_pages, nr_pages; |
1da177e4 | 1222 | struct bio *bio; |
ce8e922c NS |
1223 | int offset = bp->b_offset; |
1224 | int size = bp->b_count_desired; | |
1225 | sector_t sector = bp->b_bn; | |
1226 | unsigned int blocksize = bp->b_target->bt_bsize; | |
1da177e4 | 1227 | |
ce8e922c | 1228 | total_nr_pages = bp->b_page_count; |
1da177e4 LT |
1229 | map_i = 0; |
1230 | ||
ce8e922c NS |
1231 | if (bp->b_flags & XBF_ORDERED) { |
1232 | ASSERT(!(bp->b_flags & XBF_READ)); | |
f538d4da | 1233 | rw = WRITE_BARRIER; |
2ee1abad | 1234 | } else if (bp->b_flags & XBF_LOG_BUFFER) { |
51bdd706 NS |
1235 | ASSERT(!(bp->b_flags & XBF_READ_AHEAD)); |
1236 | bp->b_flags &= ~_XBF_RUN_QUEUES; | |
1237 | rw = (bp->b_flags & XBF_WRITE) ? WRITE_SYNC : READ_SYNC; | |
2ee1abad DC |
1238 | } else if (bp->b_flags & _XBF_RUN_QUEUES) { |
1239 | ASSERT(!(bp->b_flags & XBF_READ_AHEAD)); | |
1240 | bp->b_flags &= ~_XBF_RUN_QUEUES; | |
1241 | rw = (bp->b_flags & XBF_WRITE) ? WRITE_META : READ_META; | |
51bdd706 NS |
1242 | } else { |
1243 | rw = (bp->b_flags & XBF_WRITE) ? WRITE : | |
1244 | (bp->b_flags & XBF_READ_AHEAD) ? READA : READ; | |
f538d4da CH |
1245 | } |
1246 | ||
ce8e922c | 1247 | /* Special code path for reading a sub page size buffer in -- |
1da177e4 LT |
1248 | * we populate up the whole page, and hence the other metadata |
1249 | * in the same page. This optimization is only valid when the | |
ce8e922c | 1250 | * filesystem block size is not smaller than the page size. |
1da177e4 | 1251 | */ |
ce8e922c | 1252 | if ((bp->b_buffer_length < PAGE_CACHE_SIZE) && |
6ab455ee CH |
1253 | ((bp->b_flags & (XBF_READ|_XBF_PAGE_LOCKED)) == |
1254 | (XBF_READ|_XBF_PAGE_LOCKED)) && | |
ce8e922c | 1255 | (blocksize >= PAGE_CACHE_SIZE)) { |
1da177e4 LT |
1256 | bio = bio_alloc(GFP_NOIO, 1); |
1257 | ||
ce8e922c | 1258 | bio->bi_bdev = bp->b_target->bt_bdev; |
1da177e4 | 1259 | bio->bi_sector = sector - (offset >> BBSHIFT); |
ce8e922c NS |
1260 | bio->bi_end_io = xfs_buf_bio_end_io; |
1261 | bio->bi_private = bp; | |
1da177e4 | 1262 | |
ce8e922c | 1263 | bio_add_page(bio, bp->b_pages[0], PAGE_CACHE_SIZE, 0); |
1da177e4 LT |
1264 | size = 0; |
1265 | ||
ce8e922c | 1266 | atomic_inc(&bp->b_io_remaining); |
1da177e4 LT |
1267 | |
1268 | goto submit_io; | |
1269 | } | |
1270 | ||
1da177e4 | 1271 | next_chunk: |
ce8e922c | 1272 | atomic_inc(&bp->b_io_remaining); |
1da177e4 LT |
1273 | nr_pages = BIO_MAX_SECTORS >> (PAGE_SHIFT - BBSHIFT); |
1274 | if (nr_pages > total_nr_pages) | |
1275 | nr_pages = total_nr_pages; | |
1276 | ||
1277 | bio = bio_alloc(GFP_NOIO, nr_pages); | |
ce8e922c | 1278 | bio->bi_bdev = bp->b_target->bt_bdev; |
1da177e4 | 1279 | bio->bi_sector = sector; |
ce8e922c NS |
1280 | bio->bi_end_io = xfs_buf_bio_end_io; |
1281 | bio->bi_private = bp; | |
1da177e4 LT |
1282 | |
1283 | for (; size && nr_pages; nr_pages--, map_i++) { | |
ce8e922c | 1284 | int rbytes, nbytes = PAGE_CACHE_SIZE - offset; |
1da177e4 LT |
1285 | |
1286 | if (nbytes > size) | |
1287 | nbytes = size; | |
1288 | ||
ce8e922c NS |
1289 | rbytes = bio_add_page(bio, bp->b_pages[map_i], nbytes, offset); |
1290 | if (rbytes < nbytes) | |
1da177e4 LT |
1291 | break; |
1292 | ||
1293 | offset = 0; | |
1294 | sector += nbytes >> BBSHIFT; | |
1295 | size -= nbytes; | |
1296 | total_nr_pages--; | |
1297 | } | |
1298 | ||
1299 | submit_io: | |
1300 | if (likely(bio->bi_size)) { | |
73c77e2c JB |
1301 | if (xfs_buf_is_vmapped(bp)) { |
1302 | flush_kernel_vmap_range(bp->b_addr, | |
1303 | xfs_buf_vmap_len(bp)); | |
1304 | } | |
1da177e4 LT |
1305 | submit_bio(rw, bio); |
1306 | if (size) | |
1307 | goto next_chunk; | |
1308 | } else { | |
1309 | bio_put(bio); | |
ce8e922c | 1310 | xfs_buf_ioerror(bp, EIO); |
1da177e4 LT |
1311 | } |
1312 | } | |
1313 | ||
1da177e4 | 1314 | int |
ce8e922c NS |
1315 | xfs_buf_iorequest( |
1316 | xfs_buf_t *bp) | |
1da177e4 | 1317 | { |
0b1b213f | 1318 | trace_xfs_buf_iorequest(bp, _RET_IP_); |
1da177e4 | 1319 | |
ce8e922c NS |
1320 | if (bp->b_flags & XBF_DELWRI) { |
1321 | xfs_buf_delwri_queue(bp, 1); | |
1da177e4 LT |
1322 | return 0; |
1323 | } | |
1324 | ||
ce8e922c NS |
1325 | if (bp->b_flags & XBF_WRITE) { |
1326 | xfs_buf_wait_unpin(bp); | |
1da177e4 LT |
1327 | } |
1328 | ||
ce8e922c | 1329 | xfs_buf_hold(bp); |
1da177e4 LT |
1330 | |
1331 | /* Set the count to 1 initially, this will stop an I/O | |
1332 | * completion callout which happens before we have started | |
ce8e922c | 1333 | * all the I/O from calling xfs_buf_ioend too early. |
1da177e4 | 1334 | */ |
ce8e922c NS |
1335 | atomic_set(&bp->b_io_remaining, 1); |
1336 | _xfs_buf_ioapply(bp); | |
1337 | _xfs_buf_ioend(bp, 0); | |
1da177e4 | 1338 | |
ce8e922c | 1339 | xfs_buf_rele(bp); |
1da177e4 LT |
1340 | return 0; |
1341 | } | |
1342 | ||
1343 | /* | |
ce8e922c NS |
1344 | * Waits for I/O to complete on the buffer supplied. |
1345 | * It returns immediately if no I/O is pending. | |
1346 | * It returns the I/O error code, if any, or 0 if there was no error. | |
1da177e4 LT |
1347 | */ |
1348 | int | |
ce8e922c NS |
1349 | xfs_buf_iowait( |
1350 | xfs_buf_t *bp) | |
1da177e4 | 1351 | { |
0b1b213f CH |
1352 | trace_xfs_buf_iowait(bp, _RET_IP_); |
1353 | ||
ce8e922c NS |
1354 | if (atomic_read(&bp->b_io_remaining)) |
1355 | blk_run_address_space(bp->b_target->bt_mapping); | |
b4dd330b | 1356 | wait_for_completion(&bp->b_iowait); |
0b1b213f CH |
1357 | |
1358 | trace_xfs_buf_iowait_done(bp, _RET_IP_); | |
ce8e922c | 1359 | return bp->b_error; |
1da177e4 LT |
1360 | } |
1361 | ||
ce8e922c NS |
1362 | xfs_caddr_t |
1363 | xfs_buf_offset( | |
1364 | xfs_buf_t *bp, | |
1da177e4 LT |
1365 | size_t offset) |
1366 | { | |
1367 | struct page *page; | |
1368 | ||
ce8e922c NS |
1369 | if (bp->b_flags & XBF_MAPPED) |
1370 | return XFS_BUF_PTR(bp) + offset; | |
1da177e4 | 1371 | |
ce8e922c NS |
1372 | offset += bp->b_offset; |
1373 | page = bp->b_pages[offset >> PAGE_CACHE_SHIFT]; | |
1374 | return (xfs_caddr_t)page_address(page) + (offset & (PAGE_CACHE_SIZE-1)); | |
1da177e4 LT |
1375 | } |
1376 | ||
1377 | /* | |
1da177e4 LT |
1378 | * Move data into or out of a buffer. |
1379 | */ | |
1380 | void | |
ce8e922c NS |
1381 | xfs_buf_iomove( |
1382 | xfs_buf_t *bp, /* buffer to process */ | |
1da177e4 LT |
1383 | size_t boff, /* starting buffer offset */ |
1384 | size_t bsize, /* length to copy */ | |
b9c48649 | 1385 | void *data, /* data address */ |
ce8e922c | 1386 | xfs_buf_rw_t mode) /* read/write/zero flag */ |
1da177e4 LT |
1387 | { |
1388 | size_t bend, cpoff, csize; | |
1389 | struct page *page; | |
1390 | ||
1391 | bend = boff + bsize; | |
1392 | while (boff < bend) { | |
ce8e922c NS |
1393 | page = bp->b_pages[xfs_buf_btoct(boff + bp->b_offset)]; |
1394 | cpoff = xfs_buf_poff(boff + bp->b_offset); | |
1da177e4 | 1395 | csize = min_t(size_t, |
ce8e922c | 1396 | PAGE_CACHE_SIZE-cpoff, bp->b_count_desired-boff); |
1da177e4 LT |
1397 | |
1398 | ASSERT(((csize + cpoff) <= PAGE_CACHE_SIZE)); | |
1399 | ||
1400 | switch (mode) { | |
ce8e922c | 1401 | case XBRW_ZERO: |
1da177e4 LT |
1402 | memset(page_address(page) + cpoff, 0, csize); |
1403 | break; | |
ce8e922c | 1404 | case XBRW_READ: |
1da177e4 LT |
1405 | memcpy(data, page_address(page) + cpoff, csize); |
1406 | break; | |
ce8e922c | 1407 | case XBRW_WRITE: |
1da177e4 LT |
1408 | memcpy(page_address(page) + cpoff, data, csize); |
1409 | } | |
1410 | ||
1411 | boff += csize; | |
1412 | data += csize; | |
1413 | } | |
1414 | } | |
1415 | ||
1416 | /* | |
ce8e922c | 1417 | * Handling of buffer targets (buftargs). |
1da177e4 LT |
1418 | */ |
1419 | ||
1420 | /* | |
ce8e922c NS |
1421 | * Wait for any bufs with callbacks that have been submitted but |
1422 | * have not yet returned... walk the hash list for the target. | |
1da177e4 LT |
1423 | */ |
1424 | void | |
1425 | xfs_wait_buftarg( | |
1426 | xfs_buftarg_t *btp) | |
1427 | { | |
1428 | xfs_buf_t *bp, *n; | |
1429 | xfs_bufhash_t *hash; | |
1430 | uint i; | |
1431 | ||
1432 | for (i = 0; i < (1 << btp->bt_hashshift); i++) { | |
1433 | hash = &btp->bt_hash[i]; | |
1434 | again: | |
1435 | spin_lock(&hash->bh_lock); | |
ce8e922c NS |
1436 | list_for_each_entry_safe(bp, n, &hash->bh_list, b_hash_list) { |
1437 | ASSERT(btp == bp->b_target); | |
1438 | if (!(bp->b_flags & XBF_FS_MANAGED)) { | |
1da177e4 | 1439 | spin_unlock(&hash->bh_lock); |
2f926587 DC |
1440 | /* |
1441 | * Catch superblock reference count leaks | |
1442 | * immediately | |
1443 | */ | |
ce8e922c | 1444 | BUG_ON(bp->b_bn == 0); |
1da177e4 LT |
1445 | delay(100); |
1446 | goto again; | |
1447 | } | |
1448 | } | |
1449 | spin_unlock(&hash->bh_lock); | |
1450 | } | |
1451 | } | |
1452 | ||
1453 | /* | |
ce8e922c NS |
1454 | * Allocate buffer hash table for a given target. |
1455 | * For devices containing metadata (i.e. not the log/realtime devices) | |
1456 | * we need to allocate a much larger hash table. | |
1da177e4 LT |
1457 | */ |
1458 | STATIC void | |
1459 | xfs_alloc_bufhash( | |
1460 | xfs_buftarg_t *btp, | |
1461 | int external) | |
1462 | { | |
1463 | unsigned int i; | |
1464 | ||
1465 | btp->bt_hashshift = external ? 3 : 8; /* 8 or 256 buckets */ | |
1466 | btp->bt_hashmask = (1 << btp->bt_hashshift) - 1; | |
bdfb0430 CH |
1467 | btp->bt_hash = kmem_zalloc_large((1 << btp->bt_hashshift) * |
1468 | sizeof(xfs_bufhash_t)); | |
1da177e4 LT |
1469 | for (i = 0; i < (1 << btp->bt_hashshift); i++) { |
1470 | spin_lock_init(&btp->bt_hash[i].bh_lock); | |
1471 | INIT_LIST_HEAD(&btp->bt_hash[i].bh_list); | |
1472 | } | |
1473 | } | |
1474 | ||
1475 | STATIC void | |
1476 | xfs_free_bufhash( | |
1477 | xfs_buftarg_t *btp) | |
1478 | { | |
bdfb0430 | 1479 | kmem_free_large(btp->bt_hash); |
1da177e4 LT |
1480 | btp->bt_hash = NULL; |
1481 | } | |
1482 | ||
a6867a68 | 1483 | /* |
ce8e922c | 1484 | * buftarg list for delwrite queue processing |
a6867a68 | 1485 | */ |
e6a0e9cd | 1486 | static LIST_HEAD(xfs_buftarg_list); |
7989cb8e | 1487 | static DEFINE_SPINLOCK(xfs_buftarg_lock); |
a6867a68 DC |
1488 | |
1489 | STATIC void | |
1490 | xfs_register_buftarg( | |
1491 | xfs_buftarg_t *btp) | |
1492 | { | |
1493 | spin_lock(&xfs_buftarg_lock); | |
1494 | list_add(&btp->bt_list, &xfs_buftarg_list); | |
1495 | spin_unlock(&xfs_buftarg_lock); | |
1496 | } | |
1497 | ||
1498 | STATIC void | |
1499 | xfs_unregister_buftarg( | |
1500 | xfs_buftarg_t *btp) | |
1501 | { | |
1502 | spin_lock(&xfs_buftarg_lock); | |
1503 | list_del(&btp->bt_list); | |
1504 | spin_unlock(&xfs_buftarg_lock); | |
1505 | } | |
1506 | ||
1da177e4 LT |
1507 | void |
1508 | xfs_free_buftarg( | |
b7963133 CH |
1509 | struct xfs_mount *mp, |
1510 | struct xfs_buftarg *btp) | |
1da177e4 LT |
1511 | { |
1512 | xfs_flush_buftarg(btp, 1); | |
b7963133 CH |
1513 | if (mp->m_flags & XFS_MOUNT_BARRIER) |
1514 | xfs_blkdev_issue_flush(btp); | |
1da177e4 | 1515 | xfs_free_bufhash(btp); |
ce8e922c | 1516 | iput(btp->bt_mapping->host); |
a6867a68 | 1517 | |
ce8e922c NS |
1518 | /* Unregister the buftarg first so that we don't get a |
1519 | * wakeup finding a non-existent task | |
1520 | */ | |
a6867a68 DC |
1521 | xfs_unregister_buftarg(btp); |
1522 | kthread_stop(btp->bt_task); | |
1523 | ||
f0e2d93c | 1524 | kmem_free(btp); |
1da177e4 LT |
1525 | } |
1526 | ||
1da177e4 LT |
1527 | STATIC int |
1528 | xfs_setsize_buftarg_flags( | |
1529 | xfs_buftarg_t *btp, | |
1530 | unsigned int blocksize, | |
1531 | unsigned int sectorsize, | |
1532 | int verbose) | |
1533 | { | |
ce8e922c NS |
1534 | btp->bt_bsize = blocksize; |
1535 | btp->bt_sshift = ffs(sectorsize) - 1; | |
1536 | btp->bt_smask = sectorsize - 1; | |
1da177e4 | 1537 | |
ce8e922c | 1538 | if (set_blocksize(btp->bt_bdev, sectorsize)) { |
1da177e4 LT |
1539 | printk(KERN_WARNING |
1540 | "XFS: Cannot set_blocksize to %u on device %s\n", | |
1541 | sectorsize, XFS_BUFTARG_NAME(btp)); | |
1542 | return EINVAL; | |
1543 | } | |
1544 | ||
1545 | if (verbose && | |
1546 | (PAGE_CACHE_SIZE / BITS_PER_LONG) > sectorsize) { | |
1547 | printk(KERN_WARNING | |
1548 | "XFS: %u byte sectors in use on device %s. " | |
1549 | "This is suboptimal; %u or greater is ideal.\n", | |
1550 | sectorsize, XFS_BUFTARG_NAME(btp), | |
1551 | (unsigned int)PAGE_CACHE_SIZE / BITS_PER_LONG); | |
1552 | } | |
1553 | ||
1554 | return 0; | |
1555 | } | |
1556 | ||
1557 | /* | |
ce8e922c NS |
1558 | * When allocating the initial buffer target we have not yet |
1559 | * read in the superblock, so don't know what sized sectors | |
1560 | * are being used is at this early stage. Play safe. | |
1561 | */ | |
1da177e4 LT |
1562 | STATIC int |
1563 | xfs_setsize_buftarg_early( | |
1564 | xfs_buftarg_t *btp, | |
1565 | struct block_device *bdev) | |
1566 | { | |
1567 | return xfs_setsize_buftarg_flags(btp, | |
e1defc4f | 1568 | PAGE_CACHE_SIZE, bdev_logical_block_size(bdev), 0); |
1da177e4 LT |
1569 | } |
1570 | ||
1571 | int | |
1572 | xfs_setsize_buftarg( | |
1573 | xfs_buftarg_t *btp, | |
1574 | unsigned int blocksize, | |
1575 | unsigned int sectorsize) | |
1576 | { | |
1577 | return xfs_setsize_buftarg_flags(btp, blocksize, sectorsize, 1); | |
1578 | } | |
1579 | ||
1580 | STATIC int | |
1581 | xfs_mapping_buftarg( | |
1582 | xfs_buftarg_t *btp, | |
1583 | struct block_device *bdev) | |
1584 | { | |
1585 | struct backing_dev_info *bdi; | |
1586 | struct inode *inode; | |
1587 | struct address_space *mapping; | |
f5e54d6e | 1588 | static const struct address_space_operations mapping_aops = { |
1da177e4 | 1589 | .sync_page = block_sync_page, |
e965f963 | 1590 | .migratepage = fail_migrate_page, |
1da177e4 LT |
1591 | }; |
1592 | ||
1593 | inode = new_inode(bdev->bd_inode->i_sb); | |
1594 | if (!inode) { | |
1595 | printk(KERN_WARNING | |
1596 | "XFS: Cannot allocate mapping inode for device %s\n", | |
1597 | XFS_BUFTARG_NAME(btp)); | |
1598 | return ENOMEM; | |
1599 | } | |
1600 | inode->i_mode = S_IFBLK; | |
1601 | inode->i_bdev = bdev; | |
1602 | inode->i_rdev = bdev->bd_dev; | |
1603 | bdi = blk_get_backing_dev_info(bdev); | |
1604 | if (!bdi) | |
1605 | bdi = &default_backing_dev_info; | |
1606 | mapping = &inode->i_data; | |
1607 | mapping->a_ops = &mapping_aops; | |
1608 | mapping->backing_dev_info = bdi; | |
1609 | mapping_set_gfp_mask(mapping, GFP_NOFS); | |
ce8e922c | 1610 | btp->bt_mapping = mapping; |
1da177e4 LT |
1611 | return 0; |
1612 | } | |
1613 | ||
a6867a68 DC |
1614 | STATIC int |
1615 | xfs_alloc_delwrite_queue( | |
1616 | xfs_buftarg_t *btp) | |
1617 | { | |
1618 | int error = 0; | |
1619 | ||
1620 | INIT_LIST_HEAD(&btp->bt_list); | |
1621 | INIT_LIST_HEAD(&btp->bt_delwrite_queue); | |
007c61c6 | 1622 | spin_lock_init(&btp->bt_delwrite_lock); |
a6867a68 DC |
1623 | btp->bt_flags = 0; |
1624 | btp->bt_task = kthread_run(xfsbufd, btp, "xfsbufd"); | |
1625 | if (IS_ERR(btp->bt_task)) { | |
1626 | error = PTR_ERR(btp->bt_task); | |
1627 | goto out_error; | |
1628 | } | |
1629 | xfs_register_buftarg(btp); | |
1630 | out_error: | |
1631 | return error; | |
1632 | } | |
1633 | ||
1da177e4 LT |
1634 | xfs_buftarg_t * |
1635 | xfs_alloc_buftarg( | |
1636 | struct block_device *bdev, | |
1637 | int external) | |
1638 | { | |
1639 | xfs_buftarg_t *btp; | |
1640 | ||
1641 | btp = kmem_zalloc(sizeof(*btp), KM_SLEEP); | |
1642 | ||
ce8e922c NS |
1643 | btp->bt_dev = bdev->bd_dev; |
1644 | btp->bt_bdev = bdev; | |
1da177e4 LT |
1645 | if (xfs_setsize_buftarg_early(btp, bdev)) |
1646 | goto error; | |
1647 | if (xfs_mapping_buftarg(btp, bdev)) | |
1648 | goto error; | |
a6867a68 DC |
1649 | if (xfs_alloc_delwrite_queue(btp)) |
1650 | goto error; | |
1da177e4 LT |
1651 | xfs_alloc_bufhash(btp, external); |
1652 | return btp; | |
1653 | ||
1654 | error: | |
f0e2d93c | 1655 | kmem_free(btp); |
1da177e4 LT |
1656 | return NULL; |
1657 | } | |
1658 | ||
1659 | ||
1660 | /* | |
ce8e922c | 1661 | * Delayed write buffer handling |
1da177e4 | 1662 | */ |
1da177e4 | 1663 | STATIC void |
ce8e922c NS |
1664 | xfs_buf_delwri_queue( |
1665 | xfs_buf_t *bp, | |
1da177e4 LT |
1666 | int unlock) |
1667 | { | |
ce8e922c NS |
1668 | struct list_head *dwq = &bp->b_target->bt_delwrite_queue; |
1669 | spinlock_t *dwlk = &bp->b_target->bt_delwrite_lock; | |
a6867a68 | 1670 | |
0b1b213f CH |
1671 | trace_xfs_buf_delwri_queue(bp, _RET_IP_); |
1672 | ||
ce8e922c | 1673 | ASSERT((bp->b_flags&(XBF_DELWRI|XBF_ASYNC)) == (XBF_DELWRI|XBF_ASYNC)); |
1da177e4 | 1674 | |
a6867a68 | 1675 | spin_lock(dwlk); |
1da177e4 | 1676 | /* If already in the queue, dequeue and place at tail */ |
ce8e922c NS |
1677 | if (!list_empty(&bp->b_list)) { |
1678 | ASSERT(bp->b_flags & _XBF_DELWRI_Q); | |
1679 | if (unlock) | |
1680 | atomic_dec(&bp->b_hold); | |
1681 | list_del(&bp->b_list); | |
1da177e4 LT |
1682 | } |
1683 | ||
c9c12971 DC |
1684 | if (list_empty(dwq)) { |
1685 | /* start xfsbufd as it is about to have something to do */ | |
1686 | wake_up_process(bp->b_target->bt_task); | |
1687 | } | |
1688 | ||
ce8e922c NS |
1689 | bp->b_flags |= _XBF_DELWRI_Q; |
1690 | list_add_tail(&bp->b_list, dwq); | |
1691 | bp->b_queuetime = jiffies; | |
a6867a68 | 1692 | spin_unlock(dwlk); |
1da177e4 LT |
1693 | |
1694 | if (unlock) | |
ce8e922c | 1695 | xfs_buf_unlock(bp); |
1da177e4 LT |
1696 | } |
1697 | ||
1698 | void | |
ce8e922c NS |
1699 | xfs_buf_delwri_dequeue( |
1700 | xfs_buf_t *bp) | |
1da177e4 | 1701 | { |
ce8e922c | 1702 | spinlock_t *dwlk = &bp->b_target->bt_delwrite_lock; |
1da177e4 LT |
1703 | int dequeued = 0; |
1704 | ||
a6867a68 | 1705 | spin_lock(dwlk); |
ce8e922c NS |
1706 | if ((bp->b_flags & XBF_DELWRI) && !list_empty(&bp->b_list)) { |
1707 | ASSERT(bp->b_flags & _XBF_DELWRI_Q); | |
1708 | list_del_init(&bp->b_list); | |
1da177e4 LT |
1709 | dequeued = 1; |
1710 | } | |
ce8e922c | 1711 | bp->b_flags &= ~(XBF_DELWRI|_XBF_DELWRI_Q); |
a6867a68 | 1712 | spin_unlock(dwlk); |
1da177e4 LT |
1713 | |
1714 | if (dequeued) | |
ce8e922c | 1715 | xfs_buf_rele(bp); |
1da177e4 | 1716 | |
0b1b213f | 1717 | trace_xfs_buf_delwri_dequeue(bp, _RET_IP_); |
1da177e4 LT |
1718 | } |
1719 | ||
d808f617 DC |
1720 | /* |
1721 | * If a delwri buffer needs to be pushed before it has aged out, then promote | |
1722 | * it to the head of the delwri queue so that it will be flushed on the next | |
1723 | * xfsbufd run. We do this by resetting the queuetime of the buffer to be older | |
1724 | * than the age currently needed to flush the buffer. Hence the next time the | |
1725 | * xfsbufd sees it is guaranteed to be considered old enough to flush. | |
1726 | */ | |
1727 | void | |
1728 | xfs_buf_delwri_promote( | |
1729 | struct xfs_buf *bp) | |
1730 | { | |
1731 | struct xfs_buftarg *btp = bp->b_target; | |
1732 | long age = xfs_buf_age_centisecs * msecs_to_jiffies(10) + 1; | |
1733 | ||
1734 | ASSERT(bp->b_flags & XBF_DELWRI); | |
1735 | ASSERT(bp->b_flags & _XBF_DELWRI_Q); | |
1736 | ||
1737 | /* | |
1738 | * Check the buffer age before locking the delayed write queue as we | |
1739 | * don't need to promote buffers that are already past the flush age. | |
1740 | */ | |
1741 | if (bp->b_queuetime < jiffies - age) | |
1742 | return; | |
1743 | bp->b_queuetime = jiffies - age; | |
1744 | spin_lock(&btp->bt_delwrite_lock); | |
1745 | list_move(&bp->b_list, &btp->bt_delwrite_queue); | |
1746 | spin_unlock(&btp->bt_delwrite_lock); | |
1747 | } | |
1748 | ||
1da177e4 | 1749 | STATIC void |
ce8e922c | 1750 | xfs_buf_runall_queues( |
1da177e4 LT |
1751 | struct workqueue_struct *queue) |
1752 | { | |
1753 | flush_workqueue(queue); | |
1754 | } | |
1755 | ||
1da177e4 | 1756 | STATIC int |
23ea4032 | 1757 | xfsbufd_wakeup( |
15c84a47 NS |
1758 | int priority, |
1759 | gfp_t mask) | |
1da177e4 | 1760 | { |
da7f93e9 | 1761 | xfs_buftarg_t *btp; |
a6867a68 DC |
1762 | |
1763 | spin_lock(&xfs_buftarg_lock); | |
da7f93e9 | 1764 | list_for_each_entry(btp, &xfs_buftarg_list, bt_list) { |
ce8e922c | 1765 | if (test_bit(XBT_FORCE_SLEEP, &btp->bt_flags)) |
a6867a68 | 1766 | continue; |
c9c12971 DC |
1767 | if (list_empty(&btp->bt_delwrite_queue)) |
1768 | continue; | |
ce8e922c | 1769 | set_bit(XBT_FORCE_FLUSH, &btp->bt_flags); |
a6867a68 DC |
1770 | wake_up_process(btp->bt_task); |
1771 | } | |
1772 | spin_unlock(&xfs_buftarg_lock); | |
1da177e4 LT |
1773 | return 0; |
1774 | } | |
1775 | ||
585e6d88 DC |
1776 | /* |
1777 | * Move as many buffers as specified to the supplied list | |
1778 | * idicating if we skipped any buffers to prevent deadlocks. | |
1779 | */ | |
1780 | STATIC int | |
1781 | xfs_buf_delwri_split( | |
1782 | xfs_buftarg_t *target, | |
1783 | struct list_head *list, | |
5e6a07df | 1784 | unsigned long age) |
585e6d88 DC |
1785 | { |
1786 | xfs_buf_t *bp, *n; | |
1787 | struct list_head *dwq = &target->bt_delwrite_queue; | |
1788 | spinlock_t *dwlk = &target->bt_delwrite_lock; | |
1789 | int skipped = 0; | |
5e6a07df | 1790 | int force; |
585e6d88 | 1791 | |
5e6a07df | 1792 | force = test_and_clear_bit(XBT_FORCE_FLUSH, &target->bt_flags); |
585e6d88 DC |
1793 | INIT_LIST_HEAD(list); |
1794 | spin_lock(dwlk); | |
1795 | list_for_each_entry_safe(bp, n, dwq, b_list) { | |
0b1b213f | 1796 | trace_xfs_buf_delwri_split(bp, _RET_IP_); |
585e6d88 DC |
1797 | ASSERT(bp->b_flags & XBF_DELWRI); |
1798 | ||
1799 | if (!xfs_buf_ispin(bp) && !xfs_buf_cond_lock(bp)) { | |
5e6a07df | 1800 | if (!force && |
585e6d88 DC |
1801 | time_before(jiffies, bp->b_queuetime + age)) { |
1802 | xfs_buf_unlock(bp); | |
1803 | break; | |
1804 | } | |
1805 | ||
1806 | bp->b_flags &= ~(XBF_DELWRI|_XBF_DELWRI_Q| | |
1807 | _XBF_RUN_QUEUES); | |
1808 | bp->b_flags |= XBF_WRITE; | |
1809 | list_move_tail(&bp->b_list, list); | |
1810 | } else | |
1811 | skipped++; | |
1812 | } | |
1813 | spin_unlock(dwlk); | |
1814 | ||
1815 | return skipped; | |
1816 | ||
1817 | } | |
1818 | ||
089716aa DC |
1819 | /* |
1820 | * Compare function is more complex than it needs to be because | |
1821 | * the return value is only 32 bits and we are doing comparisons | |
1822 | * on 64 bit values | |
1823 | */ | |
1824 | static int | |
1825 | xfs_buf_cmp( | |
1826 | void *priv, | |
1827 | struct list_head *a, | |
1828 | struct list_head *b) | |
1829 | { | |
1830 | struct xfs_buf *ap = container_of(a, struct xfs_buf, b_list); | |
1831 | struct xfs_buf *bp = container_of(b, struct xfs_buf, b_list); | |
1832 | xfs_daddr_t diff; | |
1833 | ||
1834 | diff = ap->b_bn - bp->b_bn; | |
1835 | if (diff < 0) | |
1836 | return -1; | |
1837 | if (diff > 0) | |
1838 | return 1; | |
1839 | return 0; | |
1840 | } | |
1841 | ||
1842 | void | |
1843 | xfs_buf_delwri_sort( | |
1844 | xfs_buftarg_t *target, | |
1845 | struct list_head *list) | |
1846 | { | |
1847 | list_sort(NULL, list, xfs_buf_cmp); | |
1848 | } | |
1849 | ||
1da177e4 | 1850 | STATIC int |
23ea4032 | 1851 | xfsbufd( |
585e6d88 | 1852 | void *data) |
1da177e4 | 1853 | { |
089716aa | 1854 | xfs_buftarg_t *target = (xfs_buftarg_t *)data; |
1da177e4 | 1855 | |
1da177e4 LT |
1856 | current->flags |= PF_MEMALLOC; |
1857 | ||
978c7b2f RW |
1858 | set_freezable(); |
1859 | ||
1da177e4 | 1860 | do { |
c9c12971 DC |
1861 | long age = xfs_buf_age_centisecs * msecs_to_jiffies(10); |
1862 | long tout = xfs_buf_timer_centisecs * msecs_to_jiffies(10); | |
089716aa DC |
1863 | int count = 0; |
1864 | struct list_head tmp; | |
c9c12971 | 1865 | |
3e1d1d28 | 1866 | if (unlikely(freezing(current))) { |
ce8e922c | 1867 | set_bit(XBT_FORCE_SLEEP, &target->bt_flags); |
3e1d1d28 | 1868 | refrigerator(); |
abd0cf7a | 1869 | } else { |
ce8e922c | 1870 | clear_bit(XBT_FORCE_SLEEP, &target->bt_flags); |
abd0cf7a | 1871 | } |
1da177e4 | 1872 | |
c9c12971 DC |
1873 | /* sleep for a long time if there is nothing to do. */ |
1874 | if (list_empty(&target->bt_delwrite_queue)) | |
1875 | tout = MAX_SCHEDULE_TIMEOUT; | |
1876 | schedule_timeout_interruptible(tout); | |
1da177e4 | 1877 | |
c9c12971 | 1878 | xfs_buf_delwri_split(target, &tmp, age); |
089716aa | 1879 | list_sort(NULL, &tmp, xfs_buf_cmp); |
1da177e4 | 1880 | while (!list_empty(&tmp)) { |
089716aa DC |
1881 | struct xfs_buf *bp; |
1882 | bp = list_first_entry(&tmp, struct xfs_buf, b_list); | |
ce8e922c NS |
1883 | list_del_init(&bp->b_list); |
1884 | xfs_buf_iostrategy(bp); | |
585e6d88 | 1885 | count++; |
1da177e4 | 1886 | } |
f07c2250 NS |
1887 | if (count) |
1888 | blk_run_address_space(target->bt_mapping); | |
1da177e4 | 1889 | |
4df08c52 | 1890 | } while (!kthread_should_stop()); |
1da177e4 | 1891 | |
4df08c52 | 1892 | return 0; |
1da177e4 LT |
1893 | } |
1894 | ||
1895 | /* | |
ce8e922c NS |
1896 | * Go through all incore buffers, and release buffers if they belong to |
1897 | * the given device. This is used in filesystem error handling to | |
1898 | * preserve the consistency of its metadata. | |
1da177e4 LT |
1899 | */ |
1900 | int | |
1901 | xfs_flush_buftarg( | |
585e6d88 DC |
1902 | xfs_buftarg_t *target, |
1903 | int wait) | |
1da177e4 | 1904 | { |
089716aa | 1905 | xfs_buf_t *bp; |
585e6d88 | 1906 | int pincount = 0; |
089716aa DC |
1907 | LIST_HEAD(tmp_list); |
1908 | LIST_HEAD(wait_list); | |
1da177e4 | 1909 | |
c626d174 | 1910 | xfs_buf_runall_queues(xfsconvertd_workqueue); |
ce8e922c NS |
1911 | xfs_buf_runall_queues(xfsdatad_workqueue); |
1912 | xfs_buf_runall_queues(xfslogd_workqueue); | |
1da177e4 | 1913 | |
5e6a07df | 1914 | set_bit(XBT_FORCE_FLUSH, &target->bt_flags); |
089716aa | 1915 | pincount = xfs_buf_delwri_split(target, &tmp_list, 0); |
1da177e4 LT |
1916 | |
1917 | /* | |
089716aa DC |
1918 | * Dropped the delayed write list lock, now walk the temporary list. |
1919 | * All I/O is issued async and then if we need to wait for completion | |
1920 | * we do that after issuing all the IO. | |
1da177e4 | 1921 | */ |
089716aa DC |
1922 | list_sort(NULL, &tmp_list, xfs_buf_cmp); |
1923 | while (!list_empty(&tmp_list)) { | |
1924 | bp = list_first_entry(&tmp_list, struct xfs_buf, b_list); | |
585e6d88 | 1925 | ASSERT(target == bp->b_target); |
089716aa DC |
1926 | list_del_init(&bp->b_list); |
1927 | if (wait) { | |
ce8e922c | 1928 | bp->b_flags &= ~XBF_ASYNC; |
089716aa DC |
1929 | list_add(&bp->b_list, &wait_list); |
1930 | } | |
ce8e922c | 1931 | xfs_buf_iostrategy(bp); |
1da177e4 LT |
1932 | } |
1933 | ||
089716aa DC |
1934 | if (wait) { |
1935 | /* Expedite and wait for IO to complete. */ | |
f07c2250 | 1936 | blk_run_address_space(target->bt_mapping); |
089716aa DC |
1937 | while (!list_empty(&wait_list)) { |
1938 | bp = list_first_entry(&wait_list, struct xfs_buf, b_list); | |
f07c2250 | 1939 | |
089716aa DC |
1940 | list_del_init(&bp->b_list); |
1941 | xfs_iowait(bp); | |
1942 | xfs_buf_relse(bp); | |
1943 | } | |
1da177e4 LT |
1944 | } |
1945 | ||
1da177e4 LT |
1946 | return pincount; |
1947 | } | |
1948 | ||
04d8b284 | 1949 | int __init |
ce8e922c | 1950 | xfs_buf_init(void) |
1da177e4 | 1951 | { |
8758280f NS |
1952 | xfs_buf_zone = kmem_zone_init_flags(sizeof(xfs_buf_t), "xfs_buf", |
1953 | KM_ZONE_HWALIGN, NULL); | |
ce8e922c | 1954 | if (!xfs_buf_zone) |
0b1b213f | 1955 | goto out; |
04d8b284 | 1956 | |
b4337692 | 1957 | xfslogd_workqueue = create_workqueue("xfslogd"); |
23ea4032 | 1958 | if (!xfslogd_workqueue) |
04d8b284 | 1959 | goto out_free_buf_zone; |
1da177e4 | 1960 | |
b4337692 | 1961 | xfsdatad_workqueue = create_workqueue("xfsdatad"); |
23ea4032 CH |
1962 | if (!xfsdatad_workqueue) |
1963 | goto out_destroy_xfslogd_workqueue; | |
1da177e4 | 1964 | |
c626d174 DC |
1965 | xfsconvertd_workqueue = create_workqueue("xfsconvertd"); |
1966 | if (!xfsconvertd_workqueue) | |
1967 | goto out_destroy_xfsdatad_workqueue; | |
1968 | ||
8e1f936b | 1969 | register_shrinker(&xfs_buf_shake); |
23ea4032 | 1970 | return 0; |
1da177e4 | 1971 | |
c626d174 DC |
1972 | out_destroy_xfsdatad_workqueue: |
1973 | destroy_workqueue(xfsdatad_workqueue); | |
23ea4032 CH |
1974 | out_destroy_xfslogd_workqueue: |
1975 | destroy_workqueue(xfslogd_workqueue); | |
23ea4032 | 1976 | out_free_buf_zone: |
ce8e922c | 1977 | kmem_zone_destroy(xfs_buf_zone); |
0b1b213f | 1978 | out: |
8758280f | 1979 | return -ENOMEM; |
1da177e4 LT |
1980 | } |
1981 | ||
1da177e4 | 1982 | void |
ce8e922c | 1983 | xfs_buf_terminate(void) |
1da177e4 | 1984 | { |
8e1f936b | 1985 | unregister_shrinker(&xfs_buf_shake); |
c626d174 | 1986 | destroy_workqueue(xfsconvertd_workqueue); |
04d8b284 CH |
1987 | destroy_workqueue(xfsdatad_workqueue); |
1988 | destroy_workqueue(xfslogd_workqueue); | |
ce8e922c | 1989 | kmem_zone_destroy(xfs_buf_zone); |
1da177e4 | 1990 | } |
e6a0e9cd TS |
1991 | |
1992 | #ifdef CONFIG_KDB_MODULES | |
1993 | struct list_head * | |
1994 | xfs_get_buftarg_list(void) | |
1995 | { | |
1996 | return &xfs_buftarg_list; | |
1997 | } | |
1998 | #endif |