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9ff05123 RK |
1 | /* |
2 | * segment.c - NILFS segment constructor. | |
3 | * | |
4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | * Written by Ryusuke Konishi <ryusuke@osrg.net> | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <linux/pagemap.h> | |
25 | #include <linux/buffer_head.h> | |
26 | #include <linux/writeback.h> | |
27 | #include <linux/bio.h> | |
28 | #include <linux/completion.h> | |
29 | #include <linux/blkdev.h> | |
30 | #include <linux/backing-dev.h> | |
31 | #include <linux/freezer.h> | |
32 | #include <linux/kthread.h> | |
33 | #include <linux/crc32.h> | |
34 | #include <linux/pagevec.h> | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
9ff05123 RK |
36 | #include "nilfs.h" |
37 | #include "btnode.h" | |
38 | #include "page.h" | |
39 | #include "segment.h" | |
40 | #include "sufile.h" | |
41 | #include "cpfile.h" | |
42 | #include "ifile.h" | |
9ff05123 RK |
43 | #include "segbuf.h" |
44 | ||
45 | ||
46 | /* | |
47 | * Segment constructor | |
48 | */ | |
49 | #define SC_N_INODEVEC 16 /* Size of locally allocated inode vector */ | |
50 | ||
51 | #define SC_MAX_SEGDELTA 64 /* Upper limit of the number of segments | |
52 | appended in collection retry loop */ | |
53 | ||
54 | /* Construction mode */ | |
55 | enum { | |
56 | SC_LSEG_SR = 1, /* Make a logical segment having a super root */ | |
57 | SC_LSEG_DSYNC, /* Flush data blocks of a given file and make | |
58 | a logical segment without a super root */ | |
59 | SC_FLUSH_FILE, /* Flush data files, leads to segment writes without | |
60 | creating a checkpoint */ | |
61 | SC_FLUSH_DAT, /* Flush DAT file. This also creates segments without | |
62 | a checkpoint */ | |
63 | }; | |
64 | ||
65 | /* Stage numbers of dirty block collection */ | |
66 | enum { | |
67 | NILFS_ST_INIT = 0, | |
68 | NILFS_ST_GC, /* Collecting dirty blocks for GC */ | |
69 | NILFS_ST_FILE, | |
9ff05123 RK |
70 | NILFS_ST_IFILE, |
71 | NILFS_ST_CPFILE, | |
72 | NILFS_ST_SUFILE, | |
73 | NILFS_ST_DAT, | |
74 | NILFS_ST_SR, /* Super root */ | |
75 | NILFS_ST_DSYNC, /* Data sync blocks */ | |
76 | NILFS_ST_DONE, | |
77 | }; | |
78 | ||
79 | /* State flags of collection */ | |
80 | #define NILFS_CF_NODE 0x0001 /* Collecting node blocks */ | |
81 | #define NILFS_CF_IFILE_STARTED 0x0002 /* IFILE stage has started */ | |
071cb4b8 RK |
82 | #define NILFS_CF_SUFREED 0x0004 /* segment usages has been freed */ |
83 | #define NILFS_CF_HISTORY_MASK (NILFS_CF_IFILE_STARTED | NILFS_CF_SUFREED) | |
9ff05123 RK |
84 | |
85 | /* Operations depending on the construction mode and file type */ | |
86 | struct nilfs_sc_operations { | |
87 | int (*collect_data)(struct nilfs_sc_info *, struct buffer_head *, | |
88 | struct inode *); | |
89 | int (*collect_node)(struct nilfs_sc_info *, struct buffer_head *, | |
90 | struct inode *); | |
91 | int (*collect_bmap)(struct nilfs_sc_info *, struct buffer_head *, | |
92 | struct inode *); | |
93 | void (*write_data_binfo)(struct nilfs_sc_info *, | |
94 | struct nilfs_segsum_pointer *, | |
95 | union nilfs_binfo *); | |
96 | void (*write_node_binfo)(struct nilfs_sc_info *, | |
97 | struct nilfs_segsum_pointer *, | |
98 | union nilfs_binfo *); | |
99 | }; | |
100 | ||
101 | /* | |
102 | * Other definitions | |
103 | */ | |
104 | static void nilfs_segctor_start_timer(struct nilfs_sc_info *); | |
105 | static void nilfs_segctor_do_flush(struct nilfs_sc_info *, int); | |
106 | static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *); | |
693dd321 | 107 | static void nilfs_dispose_list(struct the_nilfs *, struct list_head *, int); |
9ff05123 RK |
108 | |
109 | #define nilfs_cnt32_gt(a, b) \ | |
110 | (typecheck(__u32, a) && typecheck(__u32, b) && \ | |
111 | ((__s32)(b) - (__s32)(a) < 0)) | |
112 | #define nilfs_cnt32_ge(a, b) \ | |
113 | (typecheck(__u32, a) && typecheck(__u32, b) && \ | |
114 | ((__s32)(a) - (__s32)(b) >= 0)) | |
115 | #define nilfs_cnt32_lt(a, b) nilfs_cnt32_gt(b, a) | |
116 | #define nilfs_cnt32_le(a, b) nilfs_cnt32_ge(b, a) | |
117 | ||
9ff05123 RK |
118 | static int nilfs_prepare_segment_lock(struct nilfs_transaction_info *ti) |
119 | { | |
120 | struct nilfs_transaction_info *cur_ti = current->journal_info; | |
121 | void *save = NULL; | |
122 | ||
123 | if (cur_ti) { | |
124 | if (cur_ti->ti_magic == NILFS_TI_MAGIC) | |
125 | return ++cur_ti->ti_count; | |
126 | else { | |
127 | /* | |
128 | * If journal_info field is occupied by other FS, | |
47420c79 RK |
129 | * it is saved and will be restored on |
130 | * nilfs_transaction_commit(). | |
9ff05123 RK |
131 | */ |
132 | printk(KERN_WARNING | |
133 | "NILFS warning: journal info from a different " | |
134 | "FS\n"); | |
135 | save = current->journal_info; | |
136 | } | |
137 | } | |
138 | if (!ti) { | |
139 | ti = kmem_cache_alloc(nilfs_transaction_cachep, GFP_NOFS); | |
140 | if (!ti) | |
141 | return -ENOMEM; | |
142 | ti->ti_flags = NILFS_TI_DYNAMIC_ALLOC; | |
143 | } else { | |
144 | ti->ti_flags = 0; | |
145 | } | |
146 | ti->ti_count = 0; | |
147 | ti->ti_save = save; | |
148 | ti->ti_magic = NILFS_TI_MAGIC; | |
149 | current->journal_info = ti; | |
150 | return 0; | |
151 | } | |
152 | ||
153 | /** | |
154 | * nilfs_transaction_begin - start indivisible file operations. | |
155 | * @sb: super block | |
156 | * @ti: nilfs_transaction_info | |
157 | * @vacancy_check: flags for vacancy rate checks | |
158 | * | |
159 | * nilfs_transaction_begin() acquires a reader/writer semaphore, called | |
160 | * the segment semaphore, to make a segment construction and write tasks | |
47420c79 | 161 | * exclusive. The function is used with nilfs_transaction_commit() in pairs. |
9ff05123 RK |
162 | * The region enclosed by these two functions can be nested. To avoid a |
163 | * deadlock, the semaphore is only acquired or released in the outermost call. | |
164 | * | |
165 | * This function allocates a nilfs_transaction_info struct to keep context | |
166 | * information on it. It is initialized and hooked onto the current task in | |
167 | * the outermost call. If a pre-allocated struct is given to @ti, it is used | |
7a65004b | 168 | * instead; otherwise a new struct is assigned from a slab. |
9ff05123 RK |
169 | * |
170 | * When @vacancy_check flag is set, this function will check the amount of | |
171 | * free space, and will wait for the GC to reclaim disk space if low capacity. | |
172 | * | |
173 | * Return Value: On success, 0 is returned. On error, one of the following | |
174 | * negative error code is returned. | |
175 | * | |
176 | * %-ENOMEM - Insufficient memory available. | |
177 | * | |
9ff05123 RK |
178 | * %-ENOSPC - No space left on device |
179 | */ | |
180 | int nilfs_transaction_begin(struct super_block *sb, | |
181 | struct nilfs_transaction_info *ti, | |
182 | int vacancy_check) | |
183 | { | |
9ff05123 RK |
184 | struct the_nilfs *nilfs; |
185 | int ret = nilfs_prepare_segment_lock(ti); | |
186 | ||
187 | if (unlikely(ret < 0)) | |
188 | return ret; | |
189 | if (ret > 0) | |
190 | return 0; | |
191 | ||
2c22b337 | 192 | sb_start_intwrite(sb); |
5beb6e0b | 193 | |
e3154e97 | 194 | nilfs = sb->s_fs_info; |
9ff05123 RK |
195 | down_read(&nilfs->ns_segctor_sem); |
196 | if (vacancy_check && nilfs_near_disk_full(nilfs)) { | |
197 | up_read(&nilfs->ns_segctor_sem); | |
198 | ret = -ENOSPC; | |
199 | goto failed; | |
200 | } | |
201 | return 0; | |
202 | ||
203 | failed: | |
204 | ti = current->journal_info; | |
205 | current->journal_info = ti->ti_save; | |
206 | if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC) | |
207 | kmem_cache_free(nilfs_transaction_cachep, ti); | |
2c22b337 | 208 | sb_end_intwrite(sb); |
9ff05123 RK |
209 | return ret; |
210 | } | |
211 | ||
212 | /** | |
47420c79 | 213 | * nilfs_transaction_commit - commit indivisible file operations. |
9ff05123 | 214 | * @sb: super block |
9ff05123 | 215 | * |
47420c79 RK |
216 | * nilfs_transaction_commit() releases the read semaphore which is |
217 | * acquired by nilfs_transaction_begin(). This is only performed | |
218 | * in outermost call of this function. If a commit flag is set, | |
219 | * nilfs_transaction_commit() sets a timer to start the segment | |
220 | * constructor. If a sync flag is set, it starts construction | |
221 | * directly. | |
9ff05123 | 222 | */ |
47420c79 | 223 | int nilfs_transaction_commit(struct super_block *sb) |
9ff05123 RK |
224 | { |
225 | struct nilfs_transaction_info *ti = current->journal_info; | |
e3154e97 | 226 | struct the_nilfs *nilfs = sb->s_fs_info; |
9ff05123 RK |
227 | int err = 0; |
228 | ||
229 | BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC); | |
47420c79 | 230 | ti->ti_flags |= NILFS_TI_COMMIT; |
9ff05123 RK |
231 | if (ti->ti_count > 0) { |
232 | ti->ti_count--; | |
233 | return 0; | |
234 | } | |
3fd3fe5a RK |
235 | if (nilfs->ns_writer) { |
236 | struct nilfs_sc_info *sci = nilfs->ns_writer; | |
237 | ||
9ff05123 RK |
238 | if (ti->ti_flags & NILFS_TI_COMMIT) |
239 | nilfs_segctor_start_timer(sci); | |
3fd3fe5a | 240 | if (atomic_read(&nilfs->ns_ndirtyblks) > sci->sc_watermark) |
9ff05123 RK |
241 | nilfs_segctor_do_flush(sci, 0); |
242 | } | |
3fd3fe5a | 243 | up_read(&nilfs->ns_segctor_sem); |
9ff05123 RK |
244 | current->journal_info = ti->ti_save; |
245 | ||
246 | if (ti->ti_flags & NILFS_TI_SYNC) | |
247 | err = nilfs_construct_segment(sb); | |
248 | if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC) | |
249 | kmem_cache_free(nilfs_transaction_cachep, ti); | |
2c22b337 | 250 | sb_end_intwrite(sb); |
9ff05123 RK |
251 | return err; |
252 | } | |
253 | ||
47420c79 RK |
254 | void nilfs_transaction_abort(struct super_block *sb) |
255 | { | |
256 | struct nilfs_transaction_info *ti = current->journal_info; | |
e3154e97 | 257 | struct the_nilfs *nilfs = sb->s_fs_info; |
47420c79 RK |
258 | |
259 | BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC); | |
260 | if (ti->ti_count > 0) { | |
261 | ti->ti_count--; | |
262 | return; | |
263 | } | |
e3154e97 | 264 | up_read(&nilfs->ns_segctor_sem); |
47420c79 RK |
265 | |
266 | current->journal_info = ti->ti_save; | |
267 | if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC) | |
268 | kmem_cache_free(nilfs_transaction_cachep, ti); | |
2c22b337 | 269 | sb_end_intwrite(sb); |
47420c79 RK |
270 | } |
271 | ||
9ff05123 RK |
272 | void nilfs_relax_pressure_in_lock(struct super_block *sb) |
273 | { | |
e3154e97 | 274 | struct the_nilfs *nilfs = sb->s_fs_info; |
3fd3fe5a | 275 | struct nilfs_sc_info *sci = nilfs->ns_writer; |
9ff05123 RK |
276 | |
277 | if (!sci || !sci->sc_flush_request) | |
278 | return; | |
279 | ||
280 | set_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags); | |
281 | up_read(&nilfs->ns_segctor_sem); | |
282 | ||
283 | down_write(&nilfs->ns_segctor_sem); | |
284 | if (sci->sc_flush_request && | |
285 | test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags)) { | |
286 | struct nilfs_transaction_info *ti = current->journal_info; | |
287 | ||
288 | ti->ti_flags |= NILFS_TI_WRITER; | |
289 | nilfs_segctor_do_immediate_flush(sci); | |
290 | ti->ti_flags &= ~NILFS_TI_WRITER; | |
291 | } | |
292 | downgrade_write(&nilfs->ns_segctor_sem); | |
293 | } | |
294 | ||
f7545144 | 295 | static void nilfs_transaction_lock(struct super_block *sb, |
9ff05123 RK |
296 | struct nilfs_transaction_info *ti, |
297 | int gcflag) | |
298 | { | |
299 | struct nilfs_transaction_info *cur_ti = current->journal_info; | |
e3154e97 | 300 | struct the_nilfs *nilfs = sb->s_fs_info; |
3fd3fe5a | 301 | struct nilfs_sc_info *sci = nilfs->ns_writer; |
9ff05123 | 302 | |
1f5abe7e | 303 | WARN_ON(cur_ti); |
9ff05123 RK |
304 | ti->ti_flags = NILFS_TI_WRITER; |
305 | ti->ti_count = 0; | |
306 | ti->ti_save = cur_ti; | |
307 | ti->ti_magic = NILFS_TI_MAGIC; | |
308 | INIT_LIST_HEAD(&ti->ti_garbage); | |
309 | current->journal_info = ti; | |
310 | ||
311 | for (;;) { | |
3fd3fe5a RK |
312 | down_write(&nilfs->ns_segctor_sem); |
313 | if (!test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags)) | |
9ff05123 RK |
314 | break; |
315 | ||
3fd3fe5a | 316 | nilfs_segctor_do_immediate_flush(sci); |
9ff05123 | 317 | |
f7545144 | 318 | up_write(&nilfs->ns_segctor_sem); |
9ff05123 RK |
319 | yield(); |
320 | } | |
321 | if (gcflag) | |
322 | ti->ti_flags |= NILFS_TI_GC; | |
323 | } | |
324 | ||
f7545144 | 325 | static void nilfs_transaction_unlock(struct super_block *sb) |
9ff05123 RK |
326 | { |
327 | struct nilfs_transaction_info *ti = current->journal_info; | |
e3154e97 | 328 | struct the_nilfs *nilfs = sb->s_fs_info; |
9ff05123 RK |
329 | |
330 | BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC); | |
331 | BUG_ON(ti->ti_count > 0); | |
332 | ||
693dd321 | 333 | up_write(&nilfs->ns_segctor_sem); |
9ff05123 RK |
334 | current->journal_info = ti->ti_save; |
335 | if (!list_empty(&ti->ti_garbage)) | |
693dd321 | 336 | nilfs_dispose_list(nilfs, &ti->ti_garbage, 0); |
9ff05123 RK |
337 | } |
338 | ||
339 | static void *nilfs_segctor_map_segsum_entry(struct nilfs_sc_info *sci, | |
340 | struct nilfs_segsum_pointer *ssp, | |
341 | unsigned bytes) | |
342 | { | |
343 | struct nilfs_segment_buffer *segbuf = sci->sc_curseg; | |
344 | unsigned blocksize = sci->sc_super->s_blocksize; | |
345 | void *p; | |
346 | ||
347 | if (unlikely(ssp->offset + bytes > blocksize)) { | |
348 | ssp->offset = 0; | |
349 | BUG_ON(NILFS_SEGBUF_BH_IS_LAST(ssp->bh, | |
350 | &segbuf->sb_segsum_buffers)); | |
351 | ssp->bh = NILFS_SEGBUF_NEXT_BH(ssp->bh); | |
352 | } | |
353 | p = ssp->bh->b_data + ssp->offset; | |
354 | ssp->offset += bytes; | |
355 | return p; | |
356 | } | |
357 | ||
358 | /** | |
359 | * nilfs_segctor_reset_segment_buffer - reset the current segment buffer | |
360 | * @sci: nilfs_sc_info | |
361 | */ | |
362 | static int nilfs_segctor_reset_segment_buffer(struct nilfs_sc_info *sci) | |
363 | { | |
364 | struct nilfs_segment_buffer *segbuf = sci->sc_curseg; | |
365 | struct buffer_head *sumbh; | |
366 | unsigned sumbytes; | |
367 | unsigned flags = 0; | |
368 | int err; | |
369 | ||
370 | if (nilfs_doing_gc()) | |
371 | flags = NILFS_SS_GC; | |
6c43f410 | 372 | err = nilfs_segbuf_reset(segbuf, flags, sci->sc_seg_ctime, sci->sc_cno); |
9ff05123 RK |
373 | if (unlikely(err)) |
374 | return err; | |
375 | ||
376 | sumbh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers); | |
377 | sumbytes = segbuf->sb_sum.sumbytes; | |
378 | sci->sc_finfo_ptr.bh = sumbh; sci->sc_finfo_ptr.offset = sumbytes; | |
379 | sci->sc_binfo_ptr.bh = sumbh; sci->sc_binfo_ptr.offset = sumbytes; | |
380 | sci->sc_blk_cnt = sci->sc_datablk_cnt = 0; | |
381 | return 0; | |
382 | } | |
383 | ||
384 | static int nilfs_segctor_feed_segment(struct nilfs_sc_info *sci) | |
385 | { | |
386 | sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks; | |
387 | if (NILFS_SEGBUF_IS_LAST(sci->sc_curseg, &sci->sc_segbufs)) | |
388 | return -E2BIG; /* The current segment is filled up | |
389 | (internal code) */ | |
390 | sci->sc_curseg = NILFS_NEXT_SEGBUF(sci->sc_curseg); | |
391 | return nilfs_segctor_reset_segment_buffer(sci); | |
392 | } | |
393 | ||
394 | static int nilfs_segctor_add_super_root(struct nilfs_sc_info *sci) | |
395 | { | |
396 | struct nilfs_segment_buffer *segbuf = sci->sc_curseg; | |
397 | int err; | |
398 | ||
399 | if (segbuf->sb_sum.nblocks >= segbuf->sb_rest_blocks) { | |
400 | err = nilfs_segctor_feed_segment(sci); | |
401 | if (err) | |
402 | return err; | |
403 | segbuf = sci->sc_curseg; | |
404 | } | |
1e2b68bf | 405 | err = nilfs_segbuf_extend_payload(segbuf, &segbuf->sb_super_root); |
9ff05123 RK |
406 | if (likely(!err)) |
407 | segbuf->sb_sum.flags |= NILFS_SS_SR; | |
408 | return err; | |
409 | } | |
410 | ||
411 | /* | |
412 | * Functions for making segment summary and payloads | |
413 | */ | |
414 | static int nilfs_segctor_segsum_block_required( | |
415 | struct nilfs_sc_info *sci, const struct nilfs_segsum_pointer *ssp, | |
416 | unsigned binfo_size) | |
417 | { | |
418 | unsigned blocksize = sci->sc_super->s_blocksize; | |
419 | /* Size of finfo and binfo is enough small against blocksize */ | |
420 | ||
421 | return ssp->offset + binfo_size + | |
422 | (!sci->sc_blk_cnt ? sizeof(struct nilfs_finfo) : 0) > | |
423 | blocksize; | |
424 | } | |
425 | ||
426 | static void nilfs_segctor_begin_finfo(struct nilfs_sc_info *sci, | |
427 | struct inode *inode) | |
428 | { | |
429 | sci->sc_curseg->sb_sum.nfinfo++; | |
430 | sci->sc_binfo_ptr = sci->sc_finfo_ptr; | |
431 | nilfs_segctor_map_segsum_entry( | |
432 | sci, &sci->sc_binfo_ptr, sizeof(struct nilfs_finfo)); | |
c96fa464 | 433 | |
72746ac6 RK |
434 | if (NILFS_I(inode)->i_root && |
435 | !test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags)) | |
c96fa464 | 436 | set_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags); |
9ff05123 RK |
437 | /* skip finfo */ |
438 | } | |
439 | ||
440 | static void nilfs_segctor_end_finfo(struct nilfs_sc_info *sci, | |
441 | struct inode *inode) | |
442 | { | |
443 | struct nilfs_finfo *finfo; | |
444 | struct nilfs_inode_info *ii; | |
445 | struct nilfs_segment_buffer *segbuf; | |
6c43f410 | 446 | __u64 cno; |
9ff05123 RK |
447 | |
448 | if (sci->sc_blk_cnt == 0) | |
449 | return; | |
450 | ||
451 | ii = NILFS_I(inode); | |
6c43f410 RK |
452 | |
453 | if (test_bit(NILFS_I_GCINODE, &ii->i_state)) | |
454 | cno = ii->i_cno; | |
455 | else if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) | |
456 | cno = 0; | |
457 | else | |
458 | cno = sci->sc_cno; | |
459 | ||
9ff05123 RK |
460 | finfo = nilfs_segctor_map_segsum_entry(sci, &sci->sc_finfo_ptr, |
461 | sizeof(*finfo)); | |
462 | finfo->fi_ino = cpu_to_le64(inode->i_ino); | |
463 | finfo->fi_nblocks = cpu_to_le32(sci->sc_blk_cnt); | |
464 | finfo->fi_ndatablk = cpu_to_le32(sci->sc_datablk_cnt); | |
6c43f410 | 465 | finfo->fi_cno = cpu_to_le64(cno); |
9ff05123 RK |
466 | |
467 | segbuf = sci->sc_curseg; | |
468 | segbuf->sb_sum.sumbytes = sci->sc_binfo_ptr.offset + | |
469 | sci->sc_super->s_blocksize * (segbuf->sb_sum.nsumblk - 1); | |
470 | sci->sc_finfo_ptr = sci->sc_binfo_ptr; | |
471 | sci->sc_blk_cnt = sci->sc_datablk_cnt = 0; | |
472 | } | |
473 | ||
474 | static int nilfs_segctor_add_file_block(struct nilfs_sc_info *sci, | |
475 | struct buffer_head *bh, | |
476 | struct inode *inode, | |
477 | unsigned binfo_size) | |
478 | { | |
479 | struct nilfs_segment_buffer *segbuf; | |
480 | int required, err = 0; | |
481 | ||
482 | retry: | |
483 | segbuf = sci->sc_curseg; | |
484 | required = nilfs_segctor_segsum_block_required( | |
485 | sci, &sci->sc_binfo_ptr, binfo_size); | |
486 | if (segbuf->sb_sum.nblocks + required + 1 > segbuf->sb_rest_blocks) { | |
487 | nilfs_segctor_end_finfo(sci, inode); | |
488 | err = nilfs_segctor_feed_segment(sci); | |
489 | if (err) | |
490 | return err; | |
491 | goto retry; | |
492 | } | |
493 | if (unlikely(required)) { | |
494 | err = nilfs_segbuf_extend_segsum(segbuf); | |
495 | if (unlikely(err)) | |
496 | goto failed; | |
497 | } | |
498 | if (sci->sc_blk_cnt == 0) | |
499 | nilfs_segctor_begin_finfo(sci, inode); | |
500 | ||
501 | nilfs_segctor_map_segsum_entry(sci, &sci->sc_binfo_ptr, binfo_size); | |
502 | /* Substitution to vblocknr is delayed until update_blocknr() */ | |
503 | nilfs_segbuf_add_file_buffer(segbuf, bh); | |
504 | sci->sc_blk_cnt++; | |
505 | failed: | |
506 | return err; | |
507 | } | |
508 | ||
9ff05123 RK |
509 | /* |
510 | * Callback functions that enumerate, mark, and collect dirty blocks | |
511 | */ | |
512 | static int nilfs_collect_file_data(struct nilfs_sc_info *sci, | |
513 | struct buffer_head *bh, struct inode *inode) | |
514 | { | |
515 | int err; | |
516 | ||
9ff05123 | 517 | err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh); |
e828949e RK |
518 | if (err < 0) |
519 | return err; | |
9ff05123 RK |
520 | |
521 | err = nilfs_segctor_add_file_block(sci, bh, inode, | |
522 | sizeof(struct nilfs_binfo_v)); | |
523 | if (!err) | |
524 | sci->sc_datablk_cnt++; | |
525 | return err; | |
526 | } | |
527 | ||
528 | static int nilfs_collect_file_node(struct nilfs_sc_info *sci, | |
529 | struct buffer_head *bh, | |
530 | struct inode *inode) | |
531 | { | |
e828949e | 532 | return nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh); |
9ff05123 RK |
533 | } |
534 | ||
535 | static int nilfs_collect_file_bmap(struct nilfs_sc_info *sci, | |
536 | struct buffer_head *bh, | |
537 | struct inode *inode) | |
538 | { | |
1f5abe7e | 539 | WARN_ON(!buffer_dirty(bh)); |
9ff05123 RK |
540 | return nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64)); |
541 | } | |
542 | ||
543 | static void nilfs_write_file_data_binfo(struct nilfs_sc_info *sci, | |
544 | struct nilfs_segsum_pointer *ssp, | |
545 | union nilfs_binfo *binfo) | |
546 | { | |
547 | struct nilfs_binfo_v *binfo_v = nilfs_segctor_map_segsum_entry( | |
548 | sci, ssp, sizeof(*binfo_v)); | |
549 | *binfo_v = binfo->bi_v; | |
550 | } | |
551 | ||
552 | static void nilfs_write_file_node_binfo(struct nilfs_sc_info *sci, | |
553 | struct nilfs_segsum_pointer *ssp, | |
554 | union nilfs_binfo *binfo) | |
555 | { | |
556 | __le64 *vblocknr = nilfs_segctor_map_segsum_entry( | |
557 | sci, ssp, sizeof(*vblocknr)); | |
558 | *vblocknr = binfo->bi_v.bi_vblocknr; | |
559 | } | |
560 | ||
4e819509 | 561 | static struct nilfs_sc_operations nilfs_sc_file_ops = { |
9ff05123 RK |
562 | .collect_data = nilfs_collect_file_data, |
563 | .collect_node = nilfs_collect_file_node, | |
564 | .collect_bmap = nilfs_collect_file_bmap, | |
565 | .write_data_binfo = nilfs_write_file_data_binfo, | |
566 | .write_node_binfo = nilfs_write_file_node_binfo, | |
567 | }; | |
568 | ||
569 | static int nilfs_collect_dat_data(struct nilfs_sc_info *sci, | |
570 | struct buffer_head *bh, struct inode *inode) | |
571 | { | |
572 | int err; | |
573 | ||
574 | err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh); | |
e828949e RK |
575 | if (err < 0) |
576 | return err; | |
9ff05123 RK |
577 | |
578 | err = nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64)); | |
579 | if (!err) | |
580 | sci->sc_datablk_cnt++; | |
581 | return err; | |
582 | } | |
583 | ||
584 | static int nilfs_collect_dat_bmap(struct nilfs_sc_info *sci, | |
585 | struct buffer_head *bh, struct inode *inode) | |
586 | { | |
1f5abe7e | 587 | WARN_ON(!buffer_dirty(bh)); |
9ff05123 RK |
588 | return nilfs_segctor_add_file_block(sci, bh, inode, |
589 | sizeof(struct nilfs_binfo_dat)); | |
590 | } | |
591 | ||
592 | static void nilfs_write_dat_data_binfo(struct nilfs_sc_info *sci, | |
593 | struct nilfs_segsum_pointer *ssp, | |
594 | union nilfs_binfo *binfo) | |
595 | { | |
596 | __le64 *blkoff = nilfs_segctor_map_segsum_entry(sci, ssp, | |
597 | sizeof(*blkoff)); | |
598 | *blkoff = binfo->bi_dat.bi_blkoff; | |
599 | } | |
600 | ||
601 | static void nilfs_write_dat_node_binfo(struct nilfs_sc_info *sci, | |
602 | struct nilfs_segsum_pointer *ssp, | |
603 | union nilfs_binfo *binfo) | |
604 | { | |
605 | struct nilfs_binfo_dat *binfo_dat = | |
606 | nilfs_segctor_map_segsum_entry(sci, ssp, sizeof(*binfo_dat)); | |
607 | *binfo_dat = binfo->bi_dat; | |
608 | } | |
609 | ||
4e819509 | 610 | static struct nilfs_sc_operations nilfs_sc_dat_ops = { |
9ff05123 RK |
611 | .collect_data = nilfs_collect_dat_data, |
612 | .collect_node = nilfs_collect_file_node, | |
613 | .collect_bmap = nilfs_collect_dat_bmap, | |
614 | .write_data_binfo = nilfs_write_dat_data_binfo, | |
615 | .write_node_binfo = nilfs_write_dat_node_binfo, | |
616 | }; | |
617 | ||
4e819509 | 618 | static struct nilfs_sc_operations nilfs_sc_dsync_ops = { |
9ff05123 RK |
619 | .collect_data = nilfs_collect_file_data, |
620 | .collect_node = NULL, | |
621 | .collect_bmap = NULL, | |
622 | .write_data_binfo = nilfs_write_file_data_binfo, | |
623 | .write_node_binfo = NULL, | |
624 | }; | |
625 | ||
f30bf3e4 RK |
626 | static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode, |
627 | struct list_head *listp, | |
628 | size_t nlimit, | |
629 | loff_t start, loff_t end) | |
9ff05123 | 630 | { |
9ff05123 RK |
631 | struct address_space *mapping = inode->i_mapping; |
632 | struct pagevec pvec; | |
f30bf3e4 RK |
633 | pgoff_t index = 0, last = ULONG_MAX; |
634 | size_t ndirties = 0; | |
635 | int i; | |
9ff05123 | 636 | |
f30bf3e4 RK |
637 | if (unlikely(start != 0 || end != LLONG_MAX)) { |
638 | /* | |
639 | * A valid range is given for sync-ing data pages. The | |
640 | * range is rounded to per-page; extra dirty buffers | |
641 | * may be included if blocksize < pagesize. | |
642 | */ | |
643 | index = start >> PAGE_SHIFT; | |
644 | last = end >> PAGE_SHIFT; | |
645 | } | |
9ff05123 RK |
646 | pagevec_init(&pvec, 0); |
647 | repeat: | |
f30bf3e4 RK |
648 | if (unlikely(index > last) || |
649 | !pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY, | |
650 | min_t(pgoff_t, last - index, | |
651 | PAGEVEC_SIZE - 1) + 1)) | |
652 | return ndirties; | |
9ff05123 RK |
653 | |
654 | for (i = 0; i < pagevec_count(&pvec); i++) { | |
655 | struct buffer_head *bh, *head; | |
656 | struct page *page = pvec.pages[i]; | |
657 | ||
f30bf3e4 RK |
658 | if (unlikely(page->index > last)) |
659 | break; | |
660 | ||
aa405b1f RK |
661 | lock_page(page); |
662 | if (!page_has_buffers(page)) | |
663 | create_empty_buffers(page, 1 << inode->i_blkbits, 0); | |
664 | unlock_page(page); | |
9ff05123 RK |
665 | |
666 | bh = head = page_buffers(page); | |
667 | do { | |
f30bf3e4 RK |
668 | if (!buffer_dirty(bh)) |
669 | continue; | |
670 | get_bh(bh); | |
671 | list_add_tail(&bh->b_assoc_buffers, listp); | |
672 | ndirties++; | |
673 | if (unlikely(ndirties >= nlimit)) { | |
674 | pagevec_release(&pvec); | |
675 | cond_resched(); | |
676 | return ndirties; | |
9ff05123 | 677 | } |
f30bf3e4 | 678 | } while (bh = bh->b_this_page, bh != head); |
9ff05123 RK |
679 | } |
680 | pagevec_release(&pvec); | |
681 | cond_resched(); | |
f30bf3e4 | 682 | goto repeat; |
9ff05123 RK |
683 | } |
684 | ||
685 | static void nilfs_lookup_dirty_node_buffers(struct inode *inode, | |
686 | struct list_head *listp) | |
687 | { | |
688 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
689 | struct address_space *mapping = &ii->i_btnode_cache; | |
690 | struct pagevec pvec; | |
691 | struct buffer_head *bh, *head; | |
692 | unsigned int i; | |
693 | pgoff_t index = 0; | |
694 | ||
695 | pagevec_init(&pvec, 0); | |
696 | ||
697 | while (pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY, | |
698 | PAGEVEC_SIZE)) { | |
699 | for (i = 0; i < pagevec_count(&pvec); i++) { | |
700 | bh = head = page_buffers(pvec.pages[i]); | |
701 | do { | |
702 | if (buffer_dirty(bh)) { | |
703 | get_bh(bh); | |
704 | list_add_tail(&bh->b_assoc_buffers, | |
705 | listp); | |
706 | } | |
707 | bh = bh->b_this_page; | |
708 | } while (bh != head); | |
709 | } | |
710 | pagevec_release(&pvec); | |
711 | cond_resched(); | |
712 | } | |
713 | } | |
714 | ||
693dd321 | 715 | static void nilfs_dispose_list(struct the_nilfs *nilfs, |
9ff05123 RK |
716 | struct list_head *head, int force) |
717 | { | |
718 | struct nilfs_inode_info *ii, *n; | |
719 | struct nilfs_inode_info *ivec[SC_N_INODEVEC], **pii; | |
720 | unsigned nv = 0; | |
721 | ||
722 | while (!list_empty(head)) { | |
693dd321 | 723 | spin_lock(&nilfs->ns_inode_lock); |
9ff05123 RK |
724 | list_for_each_entry_safe(ii, n, head, i_dirty) { |
725 | list_del_init(&ii->i_dirty); | |
726 | if (force) { | |
727 | if (unlikely(ii->i_bh)) { | |
728 | brelse(ii->i_bh); | |
729 | ii->i_bh = NULL; | |
730 | } | |
731 | } else if (test_bit(NILFS_I_DIRTY, &ii->i_state)) { | |
732 | set_bit(NILFS_I_QUEUED, &ii->i_state); | |
733 | list_add_tail(&ii->i_dirty, | |
693dd321 | 734 | &nilfs->ns_dirty_files); |
9ff05123 RK |
735 | continue; |
736 | } | |
737 | ivec[nv++] = ii; | |
738 | if (nv == SC_N_INODEVEC) | |
739 | break; | |
740 | } | |
693dd321 | 741 | spin_unlock(&nilfs->ns_inode_lock); |
9ff05123 RK |
742 | |
743 | for (pii = ivec; nv > 0; pii++, nv--) | |
744 | iput(&(*pii)->vfs_inode); | |
745 | } | |
746 | } | |
747 | ||
e912a5b6 RK |
748 | static int nilfs_test_metadata_dirty(struct the_nilfs *nilfs, |
749 | struct nilfs_root *root) | |
9ff05123 | 750 | { |
9ff05123 RK |
751 | int ret = 0; |
752 | ||
e912a5b6 | 753 | if (nilfs_mdt_fetch_dirty(root->ifile)) |
9ff05123 RK |
754 | ret++; |
755 | if (nilfs_mdt_fetch_dirty(nilfs->ns_cpfile)) | |
756 | ret++; | |
757 | if (nilfs_mdt_fetch_dirty(nilfs->ns_sufile)) | |
758 | ret++; | |
365e215c RK |
759 | if ((ret || nilfs_doing_gc()) && nilfs_mdt_fetch_dirty(nilfs->ns_dat)) |
760 | ret++; | |
9ff05123 RK |
761 | return ret; |
762 | } | |
763 | ||
764 | static int nilfs_segctor_clean(struct nilfs_sc_info *sci) | |
765 | { | |
766 | return list_empty(&sci->sc_dirty_files) && | |
767 | !test_bit(NILFS_SC_DIRTY, &sci->sc_flags) && | |
071cb4b8 | 768 | sci->sc_nfreesegs == 0 && |
9ff05123 RK |
769 | (!nilfs_doing_gc() || list_empty(&sci->sc_gc_inodes)); |
770 | } | |
771 | ||
772 | static int nilfs_segctor_confirm(struct nilfs_sc_info *sci) | |
773 | { | |
e3154e97 | 774 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123 RK |
775 | int ret = 0; |
776 | ||
693dd321 | 777 | if (nilfs_test_metadata_dirty(nilfs, sci->sc_root)) |
9ff05123 RK |
778 | set_bit(NILFS_SC_DIRTY, &sci->sc_flags); |
779 | ||
693dd321 RK |
780 | spin_lock(&nilfs->ns_inode_lock); |
781 | if (list_empty(&nilfs->ns_dirty_files) && nilfs_segctor_clean(sci)) | |
9ff05123 RK |
782 | ret++; |
783 | ||
693dd321 | 784 | spin_unlock(&nilfs->ns_inode_lock); |
9ff05123 RK |
785 | return ret; |
786 | } | |
787 | ||
788 | static void nilfs_segctor_clear_metadata_dirty(struct nilfs_sc_info *sci) | |
789 | { | |
e3154e97 | 790 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123 | 791 | |
e912a5b6 | 792 | nilfs_mdt_clear_dirty(sci->sc_root->ifile); |
9ff05123 RK |
793 | nilfs_mdt_clear_dirty(nilfs->ns_cpfile); |
794 | nilfs_mdt_clear_dirty(nilfs->ns_sufile); | |
365e215c | 795 | nilfs_mdt_clear_dirty(nilfs->ns_dat); |
9ff05123 RK |
796 | } |
797 | ||
798 | static int nilfs_segctor_create_checkpoint(struct nilfs_sc_info *sci) | |
799 | { | |
e3154e97 | 800 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123 RK |
801 | struct buffer_head *bh_cp; |
802 | struct nilfs_checkpoint *raw_cp; | |
803 | int err; | |
804 | ||
805 | /* XXX: this interface will be changed */ | |
806 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 1, | |
807 | &raw_cp, &bh_cp); | |
808 | if (likely(!err)) { | |
809 | /* The following code is duplicated with cpfile. But, it is | |
810 | needed to collect the checkpoint even if it was not newly | |
811 | created */ | |
5fc7b141 | 812 | mark_buffer_dirty(bh_cp); |
9ff05123 RK |
813 | nilfs_mdt_mark_dirty(nilfs->ns_cpfile); |
814 | nilfs_cpfile_put_checkpoint( | |
815 | nilfs->ns_cpfile, nilfs->ns_cno, bh_cp); | |
1f5abe7e RK |
816 | } else |
817 | WARN_ON(err == -EINVAL || err == -ENOENT); | |
818 | ||
9ff05123 RK |
819 | return err; |
820 | } | |
821 | ||
822 | static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci) | |
823 | { | |
e3154e97 | 824 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123 RK |
825 | struct buffer_head *bh_cp; |
826 | struct nilfs_checkpoint *raw_cp; | |
827 | int err; | |
828 | ||
829 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 0, | |
830 | &raw_cp, &bh_cp); | |
831 | if (unlikely(err)) { | |
1f5abe7e | 832 | WARN_ON(err == -EINVAL || err == -ENOENT); |
9ff05123 RK |
833 | goto failed_ibh; |
834 | } | |
835 | raw_cp->cp_snapshot_list.ssl_next = 0; | |
836 | raw_cp->cp_snapshot_list.ssl_prev = 0; | |
837 | raw_cp->cp_inodes_count = | |
b7c06342 | 838 | cpu_to_le64(atomic_read(&sci->sc_root->inodes_count)); |
9ff05123 | 839 | raw_cp->cp_blocks_count = |
b7c06342 | 840 | cpu_to_le64(atomic_read(&sci->sc_root->blocks_count)); |
9ff05123 RK |
841 | raw_cp->cp_nblk_inc = |
842 | cpu_to_le64(sci->sc_nblk_inc + sci->sc_nblk_this_inc); | |
843 | raw_cp->cp_create = cpu_to_le64(sci->sc_seg_ctime); | |
844 | raw_cp->cp_cno = cpu_to_le64(nilfs->ns_cno); | |
458c5b08 | 845 | |
c96fa464 RK |
846 | if (test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags)) |
847 | nilfs_checkpoint_clear_minor(raw_cp); | |
848 | else | |
849 | nilfs_checkpoint_set_minor(raw_cp); | |
850 | ||
e912a5b6 RK |
851 | nilfs_write_inode_common(sci->sc_root->ifile, |
852 | &raw_cp->cp_ifile_inode, 1); | |
9ff05123 RK |
853 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, bh_cp); |
854 | return 0; | |
855 | ||
856 | failed_ibh: | |
857 | return err; | |
858 | } | |
859 | ||
860 | static void nilfs_fill_in_file_bmap(struct inode *ifile, | |
861 | struct nilfs_inode_info *ii) | |
862 | ||
863 | { | |
864 | struct buffer_head *ibh; | |
865 | struct nilfs_inode *raw_inode; | |
866 | ||
867 | if (test_bit(NILFS_I_BMAP, &ii->i_state)) { | |
868 | ibh = ii->i_bh; | |
869 | BUG_ON(!ibh); | |
870 | raw_inode = nilfs_ifile_map_inode(ifile, ii->vfs_inode.i_ino, | |
871 | ibh); | |
872 | nilfs_bmap_write(ii->i_bmap, raw_inode); | |
873 | nilfs_ifile_unmap_inode(ifile, ii->vfs_inode.i_ino, ibh); | |
874 | } | |
875 | } | |
876 | ||
e912a5b6 | 877 | static void nilfs_segctor_fill_in_file_bmap(struct nilfs_sc_info *sci) |
9ff05123 RK |
878 | { |
879 | struct nilfs_inode_info *ii; | |
880 | ||
881 | list_for_each_entry(ii, &sci->sc_dirty_files, i_dirty) { | |
e912a5b6 | 882 | nilfs_fill_in_file_bmap(sci->sc_root->ifile, ii); |
9ff05123 RK |
883 | set_bit(NILFS_I_COLLECTED, &ii->i_state); |
884 | } | |
9ff05123 RK |
885 | } |
886 | ||
9ff05123 RK |
887 | static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info *sci, |
888 | struct the_nilfs *nilfs) | |
889 | { | |
1e2b68bf RK |
890 | struct buffer_head *bh_sr; |
891 | struct nilfs_super_root *raw_sr; | |
56eb5538 | 892 | unsigned isz, srsz; |
9ff05123 | 893 | |
1e2b68bf RK |
894 | bh_sr = NILFS_LAST_SEGBUF(&sci->sc_segbufs)->sb_super_root; |
895 | raw_sr = (struct nilfs_super_root *)bh_sr->b_data; | |
56eb5538 RK |
896 | isz = nilfs->ns_inode_size; |
897 | srsz = NILFS_SR_BYTES(isz); | |
1e2b68bf | 898 | |
56eb5538 | 899 | raw_sr->sr_bytes = cpu_to_le16(srsz); |
9ff05123 RK |
900 | raw_sr->sr_nongc_ctime |
901 | = cpu_to_le64(nilfs_doing_gc() ? | |
902 | nilfs->ns_nongc_ctime : sci->sc_seg_ctime); | |
903 | raw_sr->sr_flags = 0; | |
904 | ||
365e215c | 905 | nilfs_write_inode_common(nilfs->ns_dat, (void *)raw_sr + |
3961f0e2 RK |
906 | NILFS_SR_DAT_OFFSET(isz), 1); |
907 | nilfs_write_inode_common(nilfs->ns_cpfile, (void *)raw_sr + | |
908 | NILFS_SR_CPFILE_OFFSET(isz), 1); | |
909 | nilfs_write_inode_common(nilfs->ns_sufile, (void *)raw_sr + | |
910 | NILFS_SR_SUFILE_OFFSET(isz), 1); | |
56eb5538 | 911 | memset((void *)raw_sr + srsz, 0, nilfs->ns_blocksize - srsz); |
9ff05123 RK |
912 | } |
913 | ||
914 | static void nilfs_redirty_inodes(struct list_head *head) | |
915 | { | |
916 | struct nilfs_inode_info *ii; | |
917 | ||
918 | list_for_each_entry(ii, head, i_dirty) { | |
919 | if (test_bit(NILFS_I_COLLECTED, &ii->i_state)) | |
920 | clear_bit(NILFS_I_COLLECTED, &ii->i_state); | |
921 | } | |
922 | } | |
923 | ||
924 | static void nilfs_drop_collected_inodes(struct list_head *head) | |
925 | { | |
926 | struct nilfs_inode_info *ii; | |
927 | ||
928 | list_for_each_entry(ii, head, i_dirty) { | |
929 | if (!test_and_clear_bit(NILFS_I_COLLECTED, &ii->i_state)) | |
930 | continue; | |
931 | ||
932 | clear_bit(NILFS_I_INODE_DIRTY, &ii->i_state); | |
933 | set_bit(NILFS_I_UPDATED, &ii->i_state); | |
934 | } | |
935 | } | |
936 | ||
9ff05123 RK |
937 | static int nilfs_segctor_apply_buffers(struct nilfs_sc_info *sci, |
938 | struct inode *inode, | |
939 | struct list_head *listp, | |
940 | int (*collect)(struct nilfs_sc_info *, | |
941 | struct buffer_head *, | |
942 | struct inode *)) | |
943 | { | |
944 | struct buffer_head *bh, *n; | |
945 | int err = 0; | |
946 | ||
947 | if (collect) { | |
948 | list_for_each_entry_safe(bh, n, listp, b_assoc_buffers) { | |
949 | list_del_init(&bh->b_assoc_buffers); | |
950 | err = collect(sci, bh, inode); | |
951 | brelse(bh); | |
952 | if (unlikely(err)) | |
953 | goto dispose_buffers; | |
954 | } | |
955 | return 0; | |
956 | } | |
957 | ||
958 | dispose_buffers: | |
959 | while (!list_empty(listp)) { | |
0cc12838 RK |
960 | bh = list_first_entry(listp, struct buffer_head, |
961 | b_assoc_buffers); | |
9ff05123 RK |
962 | list_del_init(&bh->b_assoc_buffers); |
963 | brelse(bh); | |
964 | } | |
965 | return err; | |
966 | } | |
967 | ||
f30bf3e4 RK |
968 | static size_t nilfs_segctor_buffer_rest(struct nilfs_sc_info *sci) |
969 | { | |
970 | /* Remaining number of blocks within segment buffer */ | |
971 | return sci->sc_segbuf_nblocks - | |
972 | (sci->sc_nblk_this_inc + sci->sc_curseg->sb_sum.nblocks); | |
973 | } | |
974 | ||
9ff05123 RK |
975 | static int nilfs_segctor_scan_file(struct nilfs_sc_info *sci, |
976 | struct inode *inode, | |
977 | struct nilfs_sc_operations *sc_ops) | |
978 | { | |
979 | LIST_HEAD(data_buffers); | |
980 | LIST_HEAD(node_buffers); | |
f30bf3e4 | 981 | int err; |
9ff05123 RK |
982 | |
983 | if (!(sci->sc_stage.flags & NILFS_CF_NODE)) { | |
f30bf3e4 RK |
984 | size_t n, rest = nilfs_segctor_buffer_rest(sci); |
985 | ||
986 | n = nilfs_lookup_dirty_data_buffers( | |
987 | inode, &data_buffers, rest + 1, 0, LLONG_MAX); | |
988 | if (n > rest) { | |
989 | err = nilfs_segctor_apply_buffers( | |
9ff05123 | 990 | sci, inode, &data_buffers, |
f30bf3e4 RK |
991 | sc_ops->collect_data); |
992 | BUG_ON(!err); /* always receive -E2BIG or true error */ | |
9ff05123 RK |
993 | goto break_or_fail; |
994 | } | |
995 | } | |
996 | nilfs_lookup_dirty_node_buffers(inode, &node_buffers); | |
997 | ||
998 | if (!(sci->sc_stage.flags & NILFS_CF_NODE)) { | |
999 | err = nilfs_segctor_apply_buffers( | |
1000 | sci, inode, &data_buffers, sc_ops->collect_data); | |
1001 | if (unlikely(err)) { | |
1002 | /* dispose node list */ | |
1003 | nilfs_segctor_apply_buffers( | |
1004 | sci, inode, &node_buffers, NULL); | |
1005 | goto break_or_fail; | |
1006 | } | |
1007 | sci->sc_stage.flags |= NILFS_CF_NODE; | |
1008 | } | |
1009 | /* Collect node */ | |
1010 | err = nilfs_segctor_apply_buffers( | |
1011 | sci, inode, &node_buffers, sc_ops->collect_node); | |
1012 | if (unlikely(err)) | |
1013 | goto break_or_fail; | |
1014 | ||
1015 | nilfs_bmap_lookup_dirty_buffers(NILFS_I(inode)->i_bmap, &node_buffers); | |
1016 | err = nilfs_segctor_apply_buffers( | |
1017 | sci, inode, &node_buffers, sc_ops->collect_bmap); | |
1018 | if (unlikely(err)) | |
1019 | goto break_or_fail; | |
1020 | ||
1021 | nilfs_segctor_end_finfo(sci, inode); | |
1022 | sci->sc_stage.flags &= ~NILFS_CF_NODE; | |
1023 | ||
1024 | break_or_fail: | |
1025 | return err; | |
1026 | } | |
1027 | ||
1028 | static int nilfs_segctor_scan_file_dsync(struct nilfs_sc_info *sci, | |
1029 | struct inode *inode) | |
1030 | { | |
1031 | LIST_HEAD(data_buffers); | |
f30bf3e4 RK |
1032 | size_t n, rest = nilfs_segctor_buffer_rest(sci); |
1033 | int err; | |
9ff05123 | 1034 | |
f30bf3e4 RK |
1035 | n = nilfs_lookup_dirty_data_buffers(inode, &data_buffers, rest + 1, |
1036 | sci->sc_dsync_start, | |
1037 | sci->sc_dsync_end); | |
1038 | ||
1039 | err = nilfs_segctor_apply_buffers(sci, inode, &data_buffers, | |
1040 | nilfs_collect_file_data); | |
1041 | if (!err) { | |
9ff05123 | 1042 | nilfs_segctor_end_finfo(sci, inode); |
f30bf3e4 RK |
1043 | BUG_ON(n > rest); |
1044 | /* always receive -E2BIG or true error if n > rest */ | |
1045 | } | |
9ff05123 RK |
1046 | return err; |
1047 | } | |
1048 | ||
1049 | static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode) | |
1050 | { | |
e3154e97 | 1051 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123 RK |
1052 | struct list_head *head; |
1053 | struct nilfs_inode_info *ii; | |
071cb4b8 | 1054 | size_t ndone; |
9ff05123 RK |
1055 | int err = 0; |
1056 | ||
1057 | switch (sci->sc_stage.scnt) { | |
1058 | case NILFS_ST_INIT: | |
1059 | /* Pre-processes */ | |
1060 | sci->sc_stage.flags = 0; | |
1061 | ||
1062 | if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) { | |
1063 | sci->sc_nblk_inc = 0; | |
1064 | sci->sc_curseg->sb_sum.flags = NILFS_SS_LOGBGN; | |
1065 | if (mode == SC_LSEG_DSYNC) { | |
1066 | sci->sc_stage.scnt = NILFS_ST_DSYNC; | |
1067 | goto dsync_mode; | |
1068 | } | |
1069 | } | |
1070 | ||
1071 | sci->sc_stage.dirty_file_ptr = NULL; | |
1072 | sci->sc_stage.gc_inode_ptr = NULL; | |
1073 | if (mode == SC_FLUSH_DAT) { | |
1074 | sci->sc_stage.scnt = NILFS_ST_DAT; | |
1075 | goto dat_stage; | |
1076 | } | |
1077 | sci->sc_stage.scnt++; /* Fall through */ | |
1078 | case NILFS_ST_GC: | |
1079 | if (nilfs_doing_gc()) { | |
1080 | head = &sci->sc_gc_inodes; | |
1081 | ii = list_prepare_entry(sci->sc_stage.gc_inode_ptr, | |
1082 | head, i_dirty); | |
1083 | list_for_each_entry_continue(ii, head, i_dirty) { | |
1084 | err = nilfs_segctor_scan_file( | |
1085 | sci, &ii->vfs_inode, | |
1086 | &nilfs_sc_file_ops); | |
1087 | if (unlikely(err)) { | |
1088 | sci->sc_stage.gc_inode_ptr = list_entry( | |
1089 | ii->i_dirty.prev, | |
1090 | struct nilfs_inode_info, | |
1091 | i_dirty); | |
1092 | goto break_or_fail; | |
1093 | } | |
1094 | set_bit(NILFS_I_COLLECTED, &ii->i_state); | |
1095 | } | |
1096 | sci->sc_stage.gc_inode_ptr = NULL; | |
1097 | } | |
1098 | sci->sc_stage.scnt++; /* Fall through */ | |
1099 | case NILFS_ST_FILE: | |
1100 | head = &sci->sc_dirty_files; | |
1101 | ii = list_prepare_entry(sci->sc_stage.dirty_file_ptr, head, | |
1102 | i_dirty); | |
1103 | list_for_each_entry_continue(ii, head, i_dirty) { | |
1104 | clear_bit(NILFS_I_DIRTY, &ii->i_state); | |
1105 | ||
1106 | err = nilfs_segctor_scan_file(sci, &ii->vfs_inode, | |
1107 | &nilfs_sc_file_ops); | |
1108 | if (unlikely(err)) { | |
1109 | sci->sc_stage.dirty_file_ptr = | |
1110 | list_entry(ii->i_dirty.prev, | |
1111 | struct nilfs_inode_info, | |
1112 | i_dirty); | |
1113 | goto break_or_fail; | |
1114 | } | |
1115 | /* sci->sc_stage.dirty_file_ptr = NILFS_I(inode); */ | |
1116 | /* XXX: required ? */ | |
1117 | } | |
1118 | sci->sc_stage.dirty_file_ptr = NULL; | |
1119 | if (mode == SC_FLUSH_FILE) { | |
1120 | sci->sc_stage.scnt = NILFS_ST_DONE; | |
1121 | return 0; | |
1122 | } | |
9ff05123 RK |
1123 | sci->sc_stage.scnt++; |
1124 | sci->sc_stage.flags |= NILFS_CF_IFILE_STARTED; | |
1125 | /* Fall through */ | |
1126 | case NILFS_ST_IFILE: | |
e912a5b6 | 1127 | err = nilfs_segctor_scan_file(sci, sci->sc_root->ifile, |
9ff05123 RK |
1128 | &nilfs_sc_file_ops); |
1129 | if (unlikely(err)) | |
1130 | break; | |
1131 | sci->sc_stage.scnt++; | |
1132 | /* Creating a checkpoint */ | |
1133 | err = nilfs_segctor_create_checkpoint(sci); | |
1134 | if (unlikely(err)) | |
1135 | break; | |
1136 | /* Fall through */ | |
1137 | case NILFS_ST_CPFILE: | |
1138 | err = nilfs_segctor_scan_file(sci, nilfs->ns_cpfile, | |
1139 | &nilfs_sc_file_ops); | |
1140 | if (unlikely(err)) | |
1141 | break; | |
1142 | sci->sc_stage.scnt++; /* Fall through */ | |
1143 | case NILFS_ST_SUFILE: | |
071cb4b8 RK |
1144 | err = nilfs_sufile_freev(nilfs->ns_sufile, sci->sc_freesegs, |
1145 | sci->sc_nfreesegs, &ndone); | |
1146 | if (unlikely(err)) { | |
1147 | nilfs_sufile_cancel_freev(nilfs->ns_sufile, | |
1148 | sci->sc_freesegs, ndone, | |
1149 | NULL); | |
9ff05123 | 1150 | break; |
071cb4b8 RK |
1151 | } |
1152 | sci->sc_stage.flags |= NILFS_CF_SUFREED; | |
1153 | ||
9ff05123 RK |
1154 | err = nilfs_segctor_scan_file(sci, nilfs->ns_sufile, |
1155 | &nilfs_sc_file_ops); | |
1156 | if (unlikely(err)) | |
1157 | break; | |
1158 | sci->sc_stage.scnt++; /* Fall through */ | |
1159 | case NILFS_ST_DAT: | |
1160 | dat_stage: | |
365e215c | 1161 | err = nilfs_segctor_scan_file(sci, nilfs->ns_dat, |
9ff05123 RK |
1162 | &nilfs_sc_dat_ops); |
1163 | if (unlikely(err)) | |
1164 | break; | |
1165 | if (mode == SC_FLUSH_DAT) { | |
1166 | sci->sc_stage.scnt = NILFS_ST_DONE; | |
1167 | return 0; | |
1168 | } | |
1169 | sci->sc_stage.scnt++; /* Fall through */ | |
1170 | case NILFS_ST_SR: | |
1171 | if (mode == SC_LSEG_SR) { | |
1172 | /* Appending a super root */ | |
1173 | err = nilfs_segctor_add_super_root(sci); | |
1174 | if (unlikely(err)) | |
1175 | break; | |
1176 | } | |
1177 | /* End of a logical segment */ | |
1178 | sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND; | |
1179 | sci->sc_stage.scnt = NILFS_ST_DONE; | |
1180 | return 0; | |
1181 | case NILFS_ST_DSYNC: | |
1182 | dsync_mode: | |
1183 | sci->sc_curseg->sb_sum.flags |= NILFS_SS_SYNDT; | |
f30bf3e4 | 1184 | ii = sci->sc_dsync_inode; |
9ff05123 RK |
1185 | if (!test_bit(NILFS_I_BUSY, &ii->i_state)) |
1186 | break; | |
1187 | ||
1188 | err = nilfs_segctor_scan_file_dsync(sci, &ii->vfs_inode); | |
1189 | if (unlikely(err)) | |
1190 | break; | |
9ff05123 RK |
1191 | sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND; |
1192 | sci->sc_stage.scnt = NILFS_ST_DONE; | |
1193 | return 0; | |
1194 | case NILFS_ST_DONE: | |
1195 | return 0; | |
1196 | default: | |
1197 | BUG(); | |
1198 | } | |
1199 | ||
1200 | break_or_fail: | |
1201 | return err; | |
1202 | } | |
1203 | ||
a694291a RK |
1204 | /** |
1205 | * nilfs_segctor_begin_construction - setup segment buffer to make a new log | |
1206 | * @sci: nilfs_sc_info | |
1207 | * @nilfs: nilfs object | |
1208 | */ | |
9ff05123 RK |
1209 | static int nilfs_segctor_begin_construction(struct nilfs_sc_info *sci, |
1210 | struct the_nilfs *nilfs) | |
1211 | { | |
a694291a | 1212 | struct nilfs_segment_buffer *segbuf, *prev; |
9ff05123 | 1213 | __u64 nextnum; |
a694291a | 1214 | int err, alloc = 0; |
9ff05123 | 1215 | |
a694291a RK |
1216 | segbuf = nilfs_segbuf_new(sci->sc_super); |
1217 | if (unlikely(!segbuf)) | |
1218 | return -ENOMEM; | |
9ff05123 | 1219 | |
a694291a RK |
1220 | if (list_empty(&sci->sc_write_logs)) { |
1221 | nilfs_segbuf_map(segbuf, nilfs->ns_segnum, | |
1222 | nilfs->ns_pseg_offset, nilfs); | |
1223 | if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) { | |
1224 | nilfs_shift_to_next_segment(nilfs); | |
1225 | nilfs_segbuf_map(segbuf, nilfs->ns_segnum, 0, nilfs); | |
1226 | } | |
9ff05123 | 1227 | |
a694291a RK |
1228 | segbuf->sb_sum.seg_seq = nilfs->ns_seg_seq; |
1229 | nextnum = nilfs->ns_nextnum; | |
1230 | ||
1231 | if (nilfs->ns_segnum == nilfs->ns_nextnum) | |
1232 | /* Start from the head of a new full segment */ | |
1233 | alloc++; | |
1234 | } else { | |
1235 | /* Continue logs */ | |
1236 | prev = NILFS_LAST_SEGBUF(&sci->sc_write_logs); | |
1237 | nilfs_segbuf_map_cont(segbuf, prev); | |
1238 | segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq; | |
1239 | nextnum = prev->sb_nextnum; | |
1240 | ||
1241 | if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) { | |
1242 | nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs); | |
1243 | segbuf->sb_sum.seg_seq++; | |
1244 | alloc++; | |
1245 | } | |
9ff05123 | 1246 | } |
9ff05123 | 1247 | |
61a189e9 | 1248 | err = nilfs_sufile_mark_dirty(nilfs->ns_sufile, segbuf->sb_segnum); |
a694291a RK |
1249 | if (err) |
1250 | goto failed; | |
9ff05123 | 1251 | |
a694291a | 1252 | if (alloc) { |
cece5520 | 1253 | err = nilfs_sufile_alloc(nilfs->ns_sufile, &nextnum); |
a694291a RK |
1254 | if (err) |
1255 | goto failed; | |
1256 | } | |
9ff05123 RK |
1257 | nilfs_segbuf_set_next_segnum(segbuf, nextnum, nilfs); |
1258 | ||
a694291a RK |
1259 | BUG_ON(!list_empty(&sci->sc_segbufs)); |
1260 | list_add_tail(&segbuf->sb_list, &sci->sc_segbufs); | |
1261 | sci->sc_segbuf_nblocks = segbuf->sb_rest_blocks; | |
cece5520 | 1262 | return 0; |
a694291a RK |
1263 | |
1264 | failed: | |
1265 | nilfs_segbuf_free(segbuf); | |
1266 | return err; | |
9ff05123 RK |
1267 | } |
1268 | ||
1269 | static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci, | |
1270 | struct the_nilfs *nilfs, int nadd) | |
1271 | { | |
e29df395 | 1272 | struct nilfs_segment_buffer *segbuf, *prev; |
9ff05123 RK |
1273 | struct inode *sufile = nilfs->ns_sufile; |
1274 | __u64 nextnextnum; | |
1275 | LIST_HEAD(list); | |
1276 | int err, ret, i; | |
1277 | ||
1278 | prev = NILFS_LAST_SEGBUF(&sci->sc_segbufs); | |
1279 | /* | |
1280 | * Since the segment specified with nextnum might be allocated during | |
1281 | * the previous construction, the buffer including its segusage may | |
1282 | * not be dirty. The following call ensures that the buffer is dirty | |
1283 | * and will pin the buffer on memory until the sufile is written. | |
1284 | */ | |
61a189e9 | 1285 | err = nilfs_sufile_mark_dirty(sufile, prev->sb_nextnum); |
9ff05123 RK |
1286 | if (unlikely(err)) |
1287 | return err; | |
1288 | ||
1289 | for (i = 0; i < nadd; i++) { | |
1290 | /* extend segment info */ | |
1291 | err = -ENOMEM; | |
1292 | segbuf = nilfs_segbuf_new(sci->sc_super); | |
1293 | if (unlikely(!segbuf)) | |
1294 | goto failed; | |
1295 | ||
1296 | /* map this buffer to region of segment on-disk */ | |
cece5520 | 1297 | nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs); |
9ff05123 RK |
1298 | sci->sc_segbuf_nblocks += segbuf->sb_rest_blocks; |
1299 | ||
1300 | /* allocate the next next full segment */ | |
1301 | err = nilfs_sufile_alloc(sufile, &nextnextnum); | |
1302 | if (unlikely(err)) | |
1303 | goto failed_segbuf; | |
1304 | ||
1305 | segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq + 1; | |
1306 | nilfs_segbuf_set_next_segnum(segbuf, nextnextnum, nilfs); | |
1307 | ||
1308 | list_add_tail(&segbuf->sb_list, &list); | |
1309 | prev = segbuf; | |
1310 | } | |
0935db74 | 1311 | list_splice_tail(&list, &sci->sc_segbufs); |
9ff05123 RK |
1312 | return 0; |
1313 | ||
1314 | failed_segbuf: | |
1315 | nilfs_segbuf_free(segbuf); | |
1316 | failed: | |
e29df395 | 1317 | list_for_each_entry(segbuf, &list, sb_list) { |
9ff05123 | 1318 | ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); |
1f5abe7e | 1319 | WARN_ON(ret); /* never fails */ |
9ff05123 | 1320 | } |
e29df395 | 1321 | nilfs_destroy_logs(&list); |
9ff05123 RK |
1322 | return err; |
1323 | } | |
1324 | ||
a694291a RK |
1325 | static void nilfs_free_incomplete_logs(struct list_head *logs, |
1326 | struct the_nilfs *nilfs) | |
9ff05123 | 1327 | { |
a694291a RK |
1328 | struct nilfs_segment_buffer *segbuf, *prev; |
1329 | struct inode *sufile = nilfs->ns_sufile; | |
9284ad2a | 1330 | int ret; |
9ff05123 | 1331 | |
a694291a | 1332 | segbuf = NILFS_FIRST_SEGBUF(logs); |
9ff05123 | 1333 | if (nilfs->ns_nextnum != segbuf->sb_nextnum) { |
a694291a | 1334 | ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); |
1f5abe7e | 1335 | WARN_ON(ret); /* never fails */ |
9ff05123 | 1336 | } |
9284ad2a | 1337 | if (atomic_read(&segbuf->sb_err)) { |
9ff05123 RK |
1338 | /* Case 1: The first segment failed */ |
1339 | if (segbuf->sb_pseg_start != segbuf->sb_fseg_start) | |
1340 | /* Case 1a: Partial segment appended into an existing | |
1341 | segment */ | |
1342 | nilfs_terminate_segment(nilfs, segbuf->sb_fseg_start, | |
1343 | segbuf->sb_fseg_end); | |
1344 | else /* Case 1b: New full segment */ | |
1345 | set_nilfs_discontinued(nilfs); | |
9ff05123 RK |
1346 | } |
1347 | ||
a694291a RK |
1348 | prev = segbuf; |
1349 | list_for_each_entry_continue(segbuf, logs, sb_list) { | |
1350 | if (prev->sb_nextnum != segbuf->sb_nextnum) { | |
1351 | ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); | |
1352 | WARN_ON(ret); /* never fails */ | |
1353 | } | |
9284ad2a RK |
1354 | if (atomic_read(&segbuf->sb_err) && |
1355 | segbuf->sb_segnum != nilfs->ns_nextnum) | |
1356 | /* Case 2: extended segment (!= next) failed */ | |
a694291a RK |
1357 | nilfs_sufile_set_error(sufile, segbuf->sb_segnum); |
1358 | prev = segbuf; | |
9ff05123 | 1359 | } |
9ff05123 RK |
1360 | } |
1361 | ||
1362 | static void nilfs_segctor_update_segusage(struct nilfs_sc_info *sci, | |
1363 | struct inode *sufile) | |
1364 | { | |
1365 | struct nilfs_segment_buffer *segbuf; | |
9ff05123 RK |
1366 | unsigned long live_blocks; |
1367 | int ret; | |
1368 | ||
1369 | list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) { | |
9ff05123 RK |
1370 | live_blocks = segbuf->sb_sum.nblocks + |
1371 | (segbuf->sb_pseg_start - segbuf->sb_fseg_start); | |
071ec54d RK |
1372 | ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum, |
1373 | live_blocks, | |
1374 | sci->sc_seg_ctime); | |
1375 | WARN_ON(ret); /* always succeed because the segusage is dirty */ | |
9ff05123 RK |
1376 | } |
1377 | } | |
1378 | ||
a694291a | 1379 | static void nilfs_cancel_segusage(struct list_head *logs, struct inode *sufile) |
9ff05123 RK |
1380 | { |
1381 | struct nilfs_segment_buffer *segbuf; | |
9ff05123 RK |
1382 | int ret; |
1383 | ||
a694291a | 1384 | segbuf = NILFS_FIRST_SEGBUF(logs); |
071ec54d RK |
1385 | ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum, |
1386 | segbuf->sb_pseg_start - | |
1387 | segbuf->sb_fseg_start, 0); | |
1388 | WARN_ON(ret); /* always succeed because the segusage is dirty */ | |
9ff05123 | 1389 | |
a694291a | 1390 | list_for_each_entry_continue(segbuf, logs, sb_list) { |
071ec54d RK |
1391 | ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum, |
1392 | 0, 0); | |
1f5abe7e | 1393 | WARN_ON(ret); /* always succeed */ |
9ff05123 RK |
1394 | } |
1395 | } | |
1396 | ||
1397 | static void nilfs_segctor_truncate_segments(struct nilfs_sc_info *sci, | |
1398 | struct nilfs_segment_buffer *last, | |
1399 | struct inode *sufile) | |
1400 | { | |
e29df395 | 1401 | struct nilfs_segment_buffer *segbuf = last; |
9ff05123 RK |
1402 | int ret; |
1403 | ||
e29df395 | 1404 | list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) { |
9ff05123 RK |
1405 | sci->sc_segbuf_nblocks -= segbuf->sb_rest_blocks; |
1406 | ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); | |
1f5abe7e | 1407 | WARN_ON(ret); |
9ff05123 | 1408 | } |
e29df395 | 1409 | nilfs_truncate_logs(&sci->sc_segbufs, last); |
9ff05123 RK |
1410 | } |
1411 | ||
1412 | ||
1413 | static int nilfs_segctor_collect(struct nilfs_sc_info *sci, | |
1414 | struct the_nilfs *nilfs, int mode) | |
1415 | { | |
1416 | struct nilfs_cstage prev_stage = sci->sc_stage; | |
1417 | int err, nadd = 1; | |
1418 | ||
1419 | /* Collection retry loop */ | |
1420 | for (;;) { | |
9ff05123 RK |
1421 | sci->sc_nblk_this_inc = 0; |
1422 | sci->sc_curseg = NILFS_FIRST_SEGBUF(&sci->sc_segbufs); | |
1423 | ||
1424 | err = nilfs_segctor_reset_segment_buffer(sci); | |
1425 | if (unlikely(err)) | |
1426 | goto failed; | |
1427 | ||
1428 | err = nilfs_segctor_collect_blocks(sci, mode); | |
1429 | sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks; | |
1430 | if (!err) | |
1431 | break; | |
1432 | ||
1433 | if (unlikely(err != -E2BIG)) | |
1434 | goto failed; | |
1435 | ||
1436 | /* The current segment is filled up */ | |
1437 | if (mode != SC_LSEG_SR || sci->sc_stage.scnt < NILFS_ST_CPFILE) | |
1438 | break; | |
1439 | ||
2d8428ac RK |
1440 | nilfs_clear_logs(&sci->sc_segbufs); |
1441 | ||
1442 | err = nilfs_segctor_extend_segments(sci, nilfs, nadd); | |
1443 | if (unlikely(err)) | |
1444 | return err; | |
1445 | ||
071cb4b8 RK |
1446 | if (sci->sc_stage.flags & NILFS_CF_SUFREED) { |
1447 | err = nilfs_sufile_cancel_freev(nilfs->ns_sufile, | |
1448 | sci->sc_freesegs, | |
1449 | sci->sc_nfreesegs, | |
1450 | NULL); | |
1451 | WARN_ON(err); /* do not happen */ | |
1452 | } | |
9ff05123 RK |
1453 | nadd = min_t(int, nadd << 1, SC_MAX_SEGDELTA); |
1454 | sci->sc_stage = prev_stage; | |
1455 | } | |
1456 | nilfs_segctor_truncate_segments(sci, sci->sc_curseg, nilfs->ns_sufile); | |
1457 | return 0; | |
1458 | ||
1459 | failed: | |
1460 | return err; | |
1461 | } | |
1462 | ||
1463 | static void nilfs_list_replace_buffer(struct buffer_head *old_bh, | |
1464 | struct buffer_head *new_bh) | |
1465 | { | |
1466 | BUG_ON(!list_empty(&new_bh->b_assoc_buffers)); | |
1467 | ||
1468 | list_replace_init(&old_bh->b_assoc_buffers, &new_bh->b_assoc_buffers); | |
1469 | /* The caller must release old_bh */ | |
1470 | } | |
1471 | ||
1472 | static int | |
1473 | nilfs_segctor_update_payload_blocknr(struct nilfs_sc_info *sci, | |
1474 | struct nilfs_segment_buffer *segbuf, | |
1475 | int mode) | |
1476 | { | |
1477 | struct inode *inode = NULL; | |
1478 | sector_t blocknr; | |
1479 | unsigned long nfinfo = segbuf->sb_sum.nfinfo; | |
1480 | unsigned long nblocks = 0, ndatablk = 0; | |
1481 | struct nilfs_sc_operations *sc_op = NULL; | |
1482 | struct nilfs_segsum_pointer ssp; | |
1483 | struct nilfs_finfo *finfo = NULL; | |
1484 | union nilfs_binfo binfo; | |
1485 | struct buffer_head *bh, *bh_org; | |
1486 | ino_t ino = 0; | |
1487 | int err = 0; | |
1488 | ||
1489 | if (!nfinfo) | |
1490 | goto out; | |
1491 | ||
1492 | blocknr = segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk; | |
1493 | ssp.bh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers); | |
1494 | ssp.offset = sizeof(struct nilfs_segment_summary); | |
1495 | ||
1496 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) { | |
1e2b68bf | 1497 | if (bh == segbuf->sb_super_root) |
9ff05123 RK |
1498 | break; |
1499 | if (!finfo) { | |
1500 | finfo = nilfs_segctor_map_segsum_entry( | |
1501 | sci, &ssp, sizeof(*finfo)); | |
1502 | ino = le64_to_cpu(finfo->fi_ino); | |
1503 | nblocks = le32_to_cpu(finfo->fi_nblocks); | |
1504 | ndatablk = le32_to_cpu(finfo->fi_ndatablk); | |
1505 | ||
aa405b1f | 1506 | inode = bh->b_page->mapping->host; |
9ff05123 RK |
1507 | |
1508 | if (mode == SC_LSEG_DSYNC) | |
1509 | sc_op = &nilfs_sc_dsync_ops; | |
1510 | else if (ino == NILFS_DAT_INO) | |
1511 | sc_op = &nilfs_sc_dat_ops; | |
1512 | else /* file blocks */ | |
1513 | sc_op = &nilfs_sc_file_ops; | |
1514 | } | |
1515 | bh_org = bh; | |
1516 | get_bh(bh_org); | |
1517 | err = nilfs_bmap_assign(NILFS_I(inode)->i_bmap, &bh, blocknr, | |
1518 | &binfo); | |
1519 | if (bh != bh_org) | |
1520 | nilfs_list_replace_buffer(bh_org, bh); | |
1521 | brelse(bh_org); | |
1522 | if (unlikely(err)) | |
1523 | goto failed_bmap; | |
1524 | ||
1525 | if (ndatablk > 0) | |
1526 | sc_op->write_data_binfo(sci, &ssp, &binfo); | |
1527 | else | |
1528 | sc_op->write_node_binfo(sci, &ssp, &binfo); | |
1529 | ||
1530 | blocknr++; | |
1531 | if (--nblocks == 0) { | |
1532 | finfo = NULL; | |
1533 | if (--nfinfo == 0) | |
1534 | break; | |
1535 | } else if (ndatablk > 0) | |
1536 | ndatablk--; | |
1537 | } | |
1538 | out: | |
1539 | return 0; | |
1540 | ||
1541 | failed_bmap: | |
9ff05123 RK |
1542 | return err; |
1543 | } | |
1544 | ||
1545 | static int nilfs_segctor_assign(struct nilfs_sc_info *sci, int mode) | |
1546 | { | |
1547 | struct nilfs_segment_buffer *segbuf; | |
1548 | int err; | |
1549 | ||
1550 | list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) { | |
1551 | err = nilfs_segctor_update_payload_blocknr(sci, segbuf, mode); | |
1552 | if (unlikely(err)) | |
1553 | return err; | |
1554 | nilfs_segbuf_fill_in_segsum(segbuf); | |
1555 | } | |
1556 | return 0; | |
1557 | } | |
1558 | ||
1cb2d38c | 1559 | static void nilfs_begin_page_io(struct page *page) |
9ff05123 RK |
1560 | { |
1561 | if (!page || PageWriteback(page)) | |
1562 | /* For split b-tree node pages, this function may be called | |
1563 | twice. We ignore the 2nd or later calls by this check. */ | |
1cb2d38c | 1564 | return; |
9ff05123 RK |
1565 | |
1566 | lock_page(page); | |
1567 | clear_page_dirty_for_io(page); | |
1568 | set_page_writeback(page); | |
1569 | unlock_page(page); | |
9ff05123 RK |
1570 | } |
1571 | ||
1cb2d38c | 1572 | static void nilfs_segctor_prepare_write(struct nilfs_sc_info *sci) |
9ff05123 RK |
1573 | { |
1574 | struct nilfs_segment_buffer *segbuf; | |
1575 | struct page *bd_page = NULL, *fs_page = NULL; | |
9ff05123 | 1576 | |
9ff05123 RK |
1577 | list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) { |
1578 | struct buffer_head *bh; | |
1579 | ||
1580 | list_for_each_entry(bh, &segbuf->sb_segsum_buffers, | |
1581 | b_assoc_buffers) { | |
1582 | if (bh->b_page != bd_page) { | |
1583 | if (bd_page) { | |
1584 | lock_page(bd_page); | |
1585 | clear_page_dirty_for_io(bd_page); | |
1586 | set_page_writeback(bd_page); | |
1587 | unlock_page(bd_page); | |
1588 | } | |
1589 | bd_page = bh->b_page; | |
1590 | } | |
1591 | } | |
1592 | ||
1593 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, | |
1594 | b_assoc_buffers) { | |
1e2b68bf | 1595 | if (bh == segbuf->sb_super_root) { |
9ff05123 RK |
1596 | if (bh->b_page != bd_page) { |
1597 | lock_page(bd_page); | |
1598 | clear_page_dirty_for_io(bd_page); | |
1599 | set_page_writeback(bd_page); | |
1600 | unlock_page(bd_page); | |
1601 | bd_page = bh->b_page; | |
1602 | } | |
1603 | break; | |
1604 | } | |
1605 | if (bh->b_page != fs_page) { | |
1cb2d38c | 1606 | nilfs_begin_page_io(fs_page); |
9ff05123 RK |
1607 | fs_page = bh->b_page; |
1608 | } | |
1609 | } | |
1610 | } | |
1611 | if (bd_page) { | |
1612 | lock_page(bd_page); | |
1613 | clear_page_dirty_for_io(bd_page); | |
1614 | set_page_writeback(bd_page); | |
1615 | unlock_page(bd_page); | |
1616 | } | |
1cb2d38c | 1617 | nilfs_begin_page_io(fs_page); |
9ff05123 RK |
1618 | } |
1619 | ||
1620 | static int nilfs_segctor_write(struct nilfs_sc_info *sci, | |
9c965bac | 1621 | struct the_nilfs *nilfs) |
9ff05123 | 1622 | { |
d1c6b72a | 1623 | int ret; |
9ff05123 | 1624 | |
d1c6b72a | 1625 | ret = nilfs_write_logs(&sci->sc_segbufs, nilfs); |
a694291a RK |
1626 | list_splice_tail_init(&sci->sc_segbufs, &sci->sc_write_logs); |
1627 | return ret; | |
9ff05123 RK |
1628 | } |
1629 | ||
9ff05123 RK |
1630 | static void nilfs_end_page_io(struct page *page, int err) |
1631 | { | |
1632 | if (!page) | |
1633 | return; | |
1634 | ||
a9777845 | 1635 | if (buffer_nilfs_node(page_buffers(page)) && !PageWriteback(page)) { |
8227b297 RK |
1636 | /* |
1637 | * For b-tree node pages, this function may be called twice | |
1638 | * or more because they might be split in a segment. | |
1639 | */ | |
a9777845 RK |
1640 | if (PageDirty(page)) { |
1641 | /* | |
1642 | * For pages holding split b-tree node buffers, dirty | |
1643 | * flag on the buffers may be cleared discretely. | |
1644 | * In that case, the page is once redirtied for | |
1645 | * remaining buffers, and it must be cancelled if | |
1646 | * all the buffers get cleaned later. | |
1647 | */ | |
1648 | lock_page(page); | |
1649 | if (nilfs_page_buffers_clean(page)) | |
1650 | __nilfs_clear_page_dirty(page); | |
1651 | unlock_page(page); | |
1652 | } | |
9ff05123 | 1653 | return; |
a9777845 | 1654 | } |
9ff05123 | 1655 | |
1cb2d38c RK |
1656 | if (!err) { |
1657 | if (!nilfs_page_buffers_clean(page)) | |
1658 | __set_page_dirty_nobuffers(page); | |
1659 | ClearPageError(page); | |
1660 | } else { | |
1661 | __set_page_dirty_nobuffers(page); | |
1662 | SetPageError(page); | |
9ff05123 | 1663 | } |
1cb2d38c RK |
1664 | |
1665 | end_page_writeback(page); | |
9ff05123 RK |
1666 | } |
1667 | ||
1cb2d38c | 1668 | static void nilfs_abort_logs(struct list_head *logs, int err) |
9ff05123 RK |
1669 | { |
1670 | struct nilfs_segment_buffer *segbuf; | |
1671 | struct page *bd_page = NULL, *fs_page = NULL; | |
a694291a | 1672 | struct buffer_head *bh; |
9ff05123 | 1673 | |
a694291a RK |
1674 | if (list_empty(logs)) |
1675 | return; | |
9ff05123 | 1676 | |
a694291a | 1677 | list_for_each_entry(segbuf, logs, sb_list) { |
9ff05123 RK |
1678 | list_for_each_entry(bh, &segbuf->sb_segsum_buffers, |
1679 | b_assoc_buffers) { | |
1680 | if (bh->b_page != bd_page) { | |
1681 | if (bd_page) | |
1682 | end_page_writeback(bd_page); | |
1683 | bd_page = bh->b_page; | |
1684 | } | |
1685 | } | |
1686 | ||
1687 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, | |
1688 | b_assoc_buffers) { | |
1e2b68bf | 1689 | if (bh == segbuf->sb_super_root) { |
9ff05123 RK |
1690 | if (bh->b_page != bd_page) { |
1691 | end_page_writeback(bd_page); | |
1692 | bd_page = bh->b_page; | |
1693 | } | |
1694 | break; | |
1695 | } | |
1696 | if (bh->b_page != fs_page) { | |
1697 | nilfs_end_page_io(fs_page, err); | |
9ff05123 RK |
1698 | fs_page = bh->b_page; |
1699 | } | |
1700 | } | |
1701 | } | |
1702 | if (bd_page) | |
1703 | end_page_writeback(bd_page); | |
1704 | ||
1705 | nilfs_end_page_io(fs_page, err); | |
a694291a RK |
1706 | } |
1707 | ||
1708 | static void nilfs_segctor_abort_construction(struct nilfs_sc_info *sci, | |
1709 | struct the_nilfs *nilfs, int err) | |
1710 | { | |
1711 | LIST_HEAD(logs); | |
1712 | int ret; | |
1713 | ||
1714 | list_splice_tail_init(&sci->sc_write_logs, &logs); | |
1715 | ret = nilfs_wait_on_logs(&logs); | |
1cb2d38c | 1716 | nilfs_abort_logs(&logs, ret ? : err); |
a694291a RK |
1717 | |
1718 | list_splice_tail_init(&sci->sc_segbufs, &logs); | |
1719 | nilfs_cancel_segusage(&logs, nilfs->ns_sufile); | |
1720 | nilfs_free_incomplete_logs(&logs, nilfs); | |
a694291a RK |
1721 | |
1722 | if (sci->sc_stage.flags & NILFS_CF_SUFREED) { | |
1723 | ret = nilfs_sufile_cancel_freev(nilfs->ns_sufile, | |
1724 | sci->sc_freesegs, | |
1725 | sci->sc_nfreesegs, | |
1726 | NULL); | |
1727 | WARN_ON(ret); /* do not happen */ | |
1728 | } | |
1729 | ||
1730 | nilfs_destroy_logs(&logs); | |
9ff05123 RK |
1731 | } |
1732 | ||
1733 | static void nilfs_set_next_segment(struct the_nilfs *nilfs, | |
1734 | struct nilfs_segment_buffer *segbuf) | |
1735 | { | |
1736 | nilfs->ns_segnum = segbuf->sb_segnum; | |
1737 | nilfs->ns_nextnum = segbuf->sb_nextnum; | |
1738 | nilfs->ns_pseg_offset = segbuf->sb_pseg_start - segbuf->sb_fseg_start | |
1739 | + segbuf->sb_sum.nblocks; | |
1740 | nilfs->ns_seg_seq = segbuf->sb_sum.seg_seq; | |
1741 | nilfs->ns_ctime = segbuf->sb_sum.ctime; | |
1742 | } | |
1743 | ||
1744 | static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci) | |
1745 | { | |
1746 | struct nilfs_segment_buffer *segbuf; | |
1747 | struct page *bd_page = NULL, *fs_page = NULL; | |
e3154e97 | 1748 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
1e2b68bf | 1749 | int update_sr = false; |
9ff05123 | 1750 | |
a694291a | 1751 | list_for_each_entry(segbuf, &sci->sc_write_logs, sb_list) { |
9ff05123 RK |
1752 | struct buffer_head *bh; |
1753 | ||
1754 | list_for_each_entry(bh, &segbuf->sb_segsum_buffers, | |
1755 | b_assoc_buffers) { | |
1756 | set_buffer_uptodate(bh); | |
1757 | clear_buffer_dirty(bh); | |
1758 | if (bh->b_page != bd_page) { | |
1759 | if (bd_page) | |
1760 | end_page_writeback(bd_page); | |
1761 | bd_page = bh->b_page; | |
1762 | } | |
1763 | } | |
1764 | /* | |
1765 | * We assume that the buffers which belong to the same page | |
1766 | * continue over the buffer list. | |
1767 | * Under this assumption, the last BHs of pages is | |
1768 | * identifiable by the discontinuity of bh->b_page | |
1769 | * (page != fs_page). | |
1770 | * | |
1771 | * For B-tree node blocks, however, this assumption is not | |
1772 | * guaranteed. The cleanup code of B-tree node pages needs | |
1773 | * special care. | |
1774 | */ | |
1775 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, | |
1776 | b_assoc_buffers) { | |
1777 | set_buffer_uptodate(bh); | |
1778 | clear_buffer_dirty(bh); | |
27e6c7a3 | 1779 | clear_buffer_delay(bh); |
9ff05123 | 1780 | clear_buffer_nilfs_volatile(bh); |
b1f6a4f2 | 1781 | clear_buffer_nilfs_redirected(bh); |
1e2b68bf | 1782 | if (bh == segbuf->sb_super_root) { |
9ff05123 RK |
1783 | if (bh->b_page != bd_page) { |
1784 | end_page_writeback(bd_page); | |
1785 | bd_page = bh->b_page; | |
1786 | } | |
1e2b68bf | 1787 | update_sr = true; |
9ff05123 RK |
1788 | break; |
1789 | } | |
1790 | if (bh->b_page != fs_page) { | |
1791 | nilfs_end_page_io(fs_page, 0); | |
1792 | fs_page = bh->b_page; | |
1793 | } | |
1794 | } | |
1795 | ||
4762077c RK |
1796 | if (!nilfs_segbuf_simplex(segbuf)) { |
1797 | if (segbuf->sb_sum.flags & NILFS_SS_LOGBGN) { | |
9ff05123 RK |
1798 | set_bit(NILFS_SC_UNCLOSED, &sci->sc_flags); |
1799 | sci->sc_lseg_stime = jiffies; | |
1800 | } | |
4762077c | 1801 | if (segbuf->sb_sum.flags & NILFS_SS_LOGEND) |
9ff05123 RK |
1802 | clear_bit(NILFS_SC_UNCLOSED, &sci->sc_flags); |
1803 | } | |
1804 | } | |
1805 | /* | |
1806 | * Since pages may continue over multiple segment buffers, | |
1807 | * end of the last page must be checked outside of the loop. | |
1808 | */ | |
1809 | if (bd_page) | |
1810 | end_page_writeback(bd_page); | |
1811 | ||
1812 | nilfs_end_page_io(fs_page, 0); | |
1813 | ||
9ff05123 RK |
1814 | nilfs_drop_collected_inodes(&sci->sc_dirty_files); |
1815 | ||
c1c1d709 | 1816 | if (nilfs_doing_gc()) |
9ff05123 | 1817 | nilfs_drop_collected_inodes(&sci->sc_gc_inodes); |
c1c1d709 | 1818 | else |
9ff05123 | 1819 | nilfs->ns_nongc_ctime = sci->sc_seg_ctime; |
9ff05123 RK |
1820 | |
1821 | sci->sc_nblk_inc += sci->sc_nblk_this_inc; | |
1822 | ||
a694291a | 1823 | segbuf = NILFS_LAST_SEGBUF(&sci->sc_write_logs); |
9ff05123 RK |
1824 | nilfs_set_next_segment(nilfs, segbuf); |
1825 | ||
1826 | if (update_sr) { | |
1827 | nilfs_set_last_segment(nilfs, segbuf->sb_pseg_start, | |
e339ad31 | 1828 | segbuf->sb_sum.seg_seq, nilfs->ns_cno++); |
9ff05123 | 1829 | |
c96fa464 | 1830 | clear_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags); |
9ff05123 RK |
1831 | clear_bit(NILFS_SC_DIRTY, &sci->sc_flags); |
1832 | set_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags); | |
a694291a | 1833 | nilfs_segctor_clear_metadata_dirty(sci); |
9ff05123 RK |
1834 | } else |
1835 | clear_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags); | |
1836 | } | |
1837 | ||
a694291a RK |
1838 | static int nilfs_segctor_wait(struct nilfs_sc_info *sci) |
1839 | { | |
1840 | int ret; | |
1841 | ||
1842 | ret = nilfs_wait_on_logs(&sci->sc_write_logs); | |
1843 | if (!ret) { | |
1844 | nilfs_segctor_complete_write(sci); | |
1845 | nilfs_destroy_logs(&sci->sc_write_logs); | |
1846 | } | |
1847 | return ret; | |
1848 | } | |
1849 | ||
693dd321 RK |
1850 | static int nilfs_segctor_collect_dirty_files(struct nilfs_sc_info *sci, |
1851 | struct the_nilfs *nilfs) | |
9ff05123 RK |
1852 | { |
1853 | struct nilfs_inode_info *ii, *n; | |
e912a5b6 | 1854 | struct inode *ifile = sci->sc_root->ifile; |
9ff05123 | 1855 | |
693dd321 | 1856 | spin_lock(&nilfs->ns_inode_lock); |
9ff05123 | 1857 | retry: |
693dd321 | 1858 | list_for_each_entry_safe(ii, n, &nilfs->ns_dirty_files, i_dirty) { |
9ff05123 RK |
1859 | if (!ii->i_bh) { |
1860 | struct buffer_head *ibh; | |
1861 | int err; | |
1862 | ||
693dd321 | 1863 | spin_unlock(&nilfs->ns_inode_lock); |
9ff05123 | 1864 | err = nilfs_ifile_get_inode_block( |
e912a5b6 | 1865 | ifile, ii->vfs_inode.i_ino, &ibh); |
9ff05123 | 1866 | if (unlikely(err)) { |
693dd321 | 1867 | nilfs_warning(sci->sc_super, __func__, |
9ff05123 RK |
1868 | "failed to get inode block.\n"); |
1869 | return err; | |
1870 | } | |
5fc7b141 | 1871 | mark_buffer_dirty(ibh); |
e912a5b6 | 1872 | nilfs_mdt_mark_dirty(ifile); |
693dd321 | 1873 | spin_lock(&nilfs->ns_inode_lock); |
9ff05123 RK |
1874 | if (likely(!ii->i_bh)) |
1875 | ii->i_bh = ibh; | |
1876 | else | |
1877 | brelse(ibh); | |
1878 | goto retry; | |
1879 | } | |
9ff05123 RK |
1880 | |
1881 | clear_bit(NILFS_I_QUEUED, &ii->i_state); | |
1882 | set_bit(NILFS_I_BUSY, &ii->i_state); | |
eaae0f37 | 1883 | list_move_tail(&ii->i_dirty, &sci->sc_dirty_files); |
9ff05123 | 1884 | } |
693dd321 | 1885 | spin_unlock(&nilfs->ns_inode_lock); |
9ff05123 | 1886 | |
9ff05123 RK |
1887 | return 0; |
1888 | } | |
1889 | ||
693dd321 RK |
1890 | static void nilfs_segctor_drop_written_files(struct nilfs_sc_info *sci, |
1891 | struct the_nilfs *nilfs) | |
9ff05123 RK |
1892 | { |
1893 | struct nilfs_transaction_info *ti = current->journal_info; | |
1894 | struct nilfs_inode_info *ii, *n; | |
9ff05123 | 1895 | |
693dd321 | 1896 | spin_lock(&nilfs->ns_inode_lock); |
9ff05123 RK |
1897 | list_for_each_entry_safe(ii, n, &sci->sc_dirty_files, i_dirty) { |
1898 | if (!test_and_clear_bit(NILFS_I_UPDATED, &ii->i_state) || | |
6c43f410 | 1899 | test_bit(NILFS_I_DIRTY, &ii->i_state)) |
9ff05123 | 1900 | continue; |
6c43f410 | 1901 | |
9ff05123 RK |
1902 | clear_bit(NILFS_I_BUSY, &ii->i_state); |
1903 | brelse(ii->i_bh); | |
1904 | ii->i_bh = NULL; | |
eaae0f37 | 1905 | list_move_tail(&ii->i_dirty, &ti->ti_garbage); |
9ff05123 | 1906 | } |
693dd321 | 1907 | spin_unlock(&nilfs->ns_inode_lock); |
9ff05123 RK |
1908 | } |
1909 | ||
9ff05123 RK |
1910 | /* |
1911 | * Main procedure of segment constructor | |
1912 | */ | |
1913 | static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode) | |
1914 | { | |
e3154e97 | 1915 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
1e2b68bf | 1916 | int err; |
9ff05123 RK |
1917 | |
1918 | sci->sc_stage.scnt = NILFS_ST_INIT; | |
6c43f410 | 1919 | sci->sc_cno = nilfs->ns_cno; |
9ff05123 | 1920 | |
693dd321 | 1921 | err = nilfs_segctor_collect_dirty_files(sci, nilfs); |
9ff05123 RK |
1922 | if (unlikely(err)) |
1923 | goto out; | |
1924 | ||
e912a5b6 | 1925 | if (nilfs_test_metadata_dirty(nilfs, sci->sc_root)) |
9ff05123 RK |
1926 | set_bit(NILFS_SC_DIRTY, &sci->sc_flags); |
1927 | ||
1928 | if (nilfs_segctor_clean(sci)) | |
1929 | goto out; | |
1930 | ||
1931 | do { | |
1932 | sci->sc_stage.flags &= ~NILFS_CF_HISTORY_MASK; | |
1933 | ||
1934 | err = nilfs_segctor_begin_construction(sci, nilfs); | |
1935 | if (unlikely(err)) | |
1936 | goto out; | |
1937 | ||
1938 | /* Update time stamp */ | |
1939 | sci->sc_seg_ctime = get_seconds(); | |
1940 | ||
1941 | err = nilfs_segctor_collect(sci, nilfs, mode); | |
1942 | if (unlikely(err)) | |
1943 | goto failed; | |
1944 | ||
9ff05123 RK |
1945 | /* Avoid empty segment */ |
1946 | if (sci->sc_stage.scnt == NILFS_ST_DONE && | |
4762077c | 1947 | nilfs_segbuf_empty(sci->sc_curseg)) { |
a694291a | 1948 | nilfs_segctor_abort_construction(sci, nilfs, 1); |
9ff05123 RK |
1949 | goto out; |
1950 | } | |
1951 | ||
1952 | err = nilfs_segctor_assign(sci, mode); | |
1953 | if (unlikely(err)) | |
1954 | goto failed; | |
1955 | ||
9ff05123 | 1956 | if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED) |
e912a5b6 | 1957 | nilfs_segctor_fill_in_file_bmap(sci); |
9ff05123 | 1958 | |
1e2b68bf RK |
1959 | if (mode == SC_LSEG_SR && |
1960 | sci->sc_stage.scnt >= NILFS_ST_CPFILE) { | |
9ff05123 RK |
1961 | err = nilfs_segctor_fill_in_checkpoint(sci); |
1962 | if (unlikely(err)) | |
a694291a | 1963 | goto failed_to_write; |
9ff05123 RK |
1964 | |
1965 | nilfs_segctor_fill_in_super_root(sci, nilfs); | |
1966 | } | |
1967 | nilfs_segctor_update_segusage(sci, nilfs->ns_sufile); | |
1968 | ||
1969 | /* Write partial segments */ | |
1cb2d38c | 1970 | nilfs_segctor_prepare_write(sci); |
aaed1d5b RK |
1971 | |
1972 | nilfs_add_checksums_on_logs(&sci->sc_segbufs, | |
1973 | nilfs->ns_crc_seed); | |
9ff05123 | 1974 | |
9c965bac | 1975 | err = nilfs_segctor_write(sci, nilfs); |
9ff05123 RK |
1976 | if (unlikely(err)) |
1977 | goto failed_to_write; | |
1978 | ||
a694291a RK |
1979 | if (sci->sc_stage.scnt == NILFS_ST_DONE || |
1980 | nilfs->ns_blocksize_bits != PAGE_CACHE_SHIFT) { | |
1981 | /* | |
1982 | * At this point, we avoid double buffering | |
1983 | * for blocksize < pagesize because page dirty | |
1984 | * flag is turned off during write and dirty | |
1985 | * buffers are not properly collected for | |
1986 | * pages crossing over segments. | |
1987 | */ | |
1988 | err = nilfs_segctor_wait(sci); | |
1989 | if (err) | |
1990 | goto failed_to_write; | |
1991 | } | |
9ff05123 RK |
1992 | } while (sci->sc_stage.scnt != NILFS_ST_DONE); |
1993 | ||
9ff05123 | 1994 | out: |
693dd321 | 1995 | nilfs_segctor_drop_written_files(sci, nilfs); |
9ff05123 RK |
1996 | return err; |
1997 | ||
1998 | failed_to_write: | |
9ff05123 RK |
1999 | if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED) |
2000 | nilfs_redirty_inodes(&sci->sc_dirty_files); | |
9ff05123 RK |
2001 | |
2002 | failed: | |
2003 | if (nilfs_doing_gc()) | |
2004 | nilfs_redirty_inodes(&sci->sc_gc_inodes); | |
a694291a | 2005 | nilfs_segctor_abort_construction(sci, nilfs, err); |
9ff05123 RK |
2006 | goto out; |
2007 | } | |
2008 | ||
2009 | /** | |
9ccf56c1 | 2010 | * nilfs_segctor_start_timer - set timer of background write |
9ff05123 RK |
2011 | * @sci: nilfs_sc_info |
2012 | * | |
2013 | * If the timer has already been set, it ignores the new request. | |
2014 | * This function MUST be called within a section locking the segment | |
2015 | * semaphore. | |
2016 | */ | |
2017 | static void nilfs_segctor_start_timer(struct nilfs_sc_info *sci) | |
2018 | { | |
2019 | spin_lock(&sci->sc_state_lock); | |
fdce895e LH |
2020 | if (!(sci->sc_state & NILFS_SEGCTOR_COMMIT)) { |
2021 | sci->sc_timer.expires = jiffies + sci->sc_interval; | |
2022 | add_timer(&sci->sc_timer); | |
9ff05123 RK |
2023 | sci->sc_state |= NILFS_SEGCTOR_COMMIT; |
2024 | } | |
2025 | spin_unlock(&sci->sc_state_lock); | |
2026 | } | |
2027 | ||
2028 | static void nilfs_segctor_do_flush(struct nilfs_sc_info *sci, int bn) | |
2029 | { | |
2030 | spin_lock(&sci->sc_state_lock); | |
2031 | if (!(sci->sc_flush_request & (1 << bn))) { | |
2032 | unsigned long prev_req = sci->sc_flush_request; | |
2033 | ||
2034 | sci->sc_flush_request |= (1 << bn); | |
2035 | if (!prev_req) | |
2036 | wake_up(&sci->sc_wait_daemon); | |
2037 | } | |
2038 | spin_unlock(&sci->sc_state_lock); | |
2039 | } | |
2040 | ||
2041 | /** | |
2042 | * nilfs_flush_segment - trigger a segment construction for resource control | |
2043 | * @sb: super block | |
2044 | * @ino: inode number of the file to be flushed out. | |
2045 | */ | |
2046 | void nilfs_flush_segment(struct super_block *sb, ino_t ino) | |
2047 | { | |
e3154e97 | 2048 | struct the_nilfs *nilfs = sb->s_fs_info; |
3fd3fe5a | 2049 | struct nilfs_sc_info *sci = nilfs->ns_writer; |
9ff05123 RK |
2050 | |
2051 | if (!sci || nilfs_doing_construction()) | |
2052 | return; | |
2053 | nilfs_segctor_do_flush(sci, NILFS_MDT_INODE(sb, ino) ? ino : 0); | |
2054 | /* assign bit 0 to data files */ | |
2055 | } | |
2056 | ||
9ff05123 RK |
2057 | struct nilfs_segctor_wait_request { |
2058 | wait_queue_t wq; | |
2059 | __u32 seq; | |
2060 | int err; | |
2061 | atomic_t done; | |
2062 | }; | |
2063 | ||
2064 | static int nilfs_segctor_sync(struct nilfs_sc_info *sci) | |
2065 | { | |
2066 | struct nilfs_segctor_wait_request wait_req; | |
2067 | int err = 0; | |
2068 | ||
2069 | spin_lock(&sci->sc_state_lock); | |
2070 | init_wait(&wait_req.wq); | |
2071 | wait_req.err = 0; | |
2072 | atomic_set(&wait_req.done, 0); | |
2073 | wait_req.seq = ++sci->sc_seq_request; | |
2074 | spin_unlock(&sci->sc_state_lock); | |
2075 | ||
2076 | init_waitqueue_entry(&wait_req.wq, current); | |
2077 | add_wait_queue(&sci->sc_wait_request, &wait_req.wq); | |
2078 | set_current_state(TASK_INTERRUPTIBLE); | |
2079 | wake_up(&sci->sc_wait_daemon); | |
2080 | ||
2081 | for (;;) { | |
2082 | if (atomic_read(&wait_req.done)) { | |
2083 | err = wait_req.err; | |
2084 | break; | |
2085 | } | |
2086 | if (!signal_pending(current)) { | |
2087 | schedule(); | |
2088 | continue; | |
2089 | } | |
2090 | err = -ERESTARTSYS; | |
2091 | break; | |
2092 | } | |
2093 | finish_wait(&sci->sc_wait_request, &wait_req.wq); | |
2094 | return err; | |
2095 | } | |
2096 | ||
2097 | static void nilfs_segctor_wakeup(struct nilfs_sc_info *sci, int err) | |
2098 | { | |
2099 | struct nilfs_segctor_wait_request *wrq, *n; | |
2100 | unsigned long flags; | |
2101 | ||
2102 | spin_lock_irqsave(&sci->sc_wait_request.lock, flags); | |
2103 | list_for_each_entry_safe(wrq, n, &sci->sc_wait_request.task_list, | |
2104 | wq.task_list) { | |
2105 | if (!atomic_read(&wrq->done) && | |
2106 | nilfs_cnt32_ge(sci->sc_seq_done, wrq->seq)) { | |
2107 | wrq->err = err; | |
2108 | atomic_set(&wrq->done, 1); | |
2109 | } | |
2110 | if (atomic_read(&wrq->done)) { | |
2111 | wrq->wq.func(&wrq->wq, | |
2112 | TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, | |
2113 | 0, NULL); | |
2114 | } | |
2115 | } | |
2116 | spin_unlock_irqrestore(&sci->sc_wait_request.lock, flags); | |
2117 | } | |
2118 | ||
2119 | /** | |
2120 | * nilfs_construct_segment - construct a logical segment | |
2121 | * @sb: super block | |
2122 | * | |
2123 | * Return Value: On success, 0 is retured. On errors, one of the following | |
2124 | * negative error code is returned. | |
2125 | * | |
2126 | * %-EROFS - Read only filesystem. | |
2127 | * | |
2128 | * %-EIO - I/O error | |
2129 | * | |
2130 | * %-ENOSPC - No space left on device (only in a panic state). | |
2131 | * | |
2132 | * %-ERESTARTSYS - Interrupted. | |
2133 | * | |
2134 | * %-ENOMEM - Insufficient memory available. | |
2135 | */ | |
2136 | int nilfs_construct_segment(struct super_block *sb) | |
2137 | { | |
e3154e97 | 2138 | struct the_nilfs *nilfs = sb->s_fs_info; |
3fd3fe5a | 2139 | struct nilfs_sc_info *sci = nilfs->ns_writer; |
9ff05123 RK |
2140 | struct nilfs_transaction_info *ti; |
2141 | int err; | |
2142 | ||
2143 | if (!sci) | |
2144 | return -EROFS; | |
2145 | ||
2146 | /* A call inside transactions causes a deadlock. */ | |
2147 | BUG_ON((ti = current->journal_info) && ti->ti_magic == NILFS_TI_MAGIC); | |
2148 | ||
2149 | err = nilfs_segctor_sync(sci); | |
2150 | return err; | |
2151 | } | |
2152 | ||
2153 | /** | |
2154 | * nilfs_construct_dsync_segment - construct a data-only logical segment | |
2155 | * @sb: super block | |
f30bf3e4 RK |
2156 | * @inode: inode whose data blocks should be written out |
2157 | * @start: start byte offset | |
2158 | * @end: end byte offset (inclusive) | |
9ff05123 RK |
2159 | * |
2160 | * Return Value: On success, 0 is retured. On errors, one of the following | |
2161 | * negative error code is returned. | |
2162 | * | |
2163 | * %-EROFS - Read only filesystem. | |
2164 | * | |
2165 | * %-EIO - I/O error | |
2166 | * | |
2167 | * %-ENOSPC - No space left on device (only in a panic state). | |
2168 | * | |
2169 | * %-ERESTARTSYS - Interrupted. | |
2170 | * | |
2171 | * %-ENOMEM - Insufficient memory available. | |
2172 | */ | |
f30bf3e4 RK |
2173 | int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode, |
2174 | loff_t start, loff_t end) | |
9ff05123 | 2175 | { |
e3154e97 | 2176 | struct the_nilfs *nilfs = sb->s_fs_info; |
3fd3fe5a | 2177 | struct nilfs_sc_info *sci = nilfs->ns_writer; |
9ff05123 RK |
2178 | struct nilfs_inode_info *ii; |
2179 | struct nilfs_transaction_info ti; | |
2180 | int err = 0; | |
2181 | ||
2182 | if (!sci) | |
2183 | return -EROFS; | |
2184 | ||
f7545144 | 2185 | nilfs_transaction_lock(sb, &ti, 0); |
9ff05123 RK |
2186 | |
2187 | ii = NILFS_I(inode); | |
2188 | if (test_bit(NILFS_I_INODE_DIRTY, &ii->i_state) || | |
3b2ce58b | 2189 | nilfs_test_opt(nilfs, STRICT_ORDER) || |
9ff05123 | 2190 | test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) || |
3b2ce58b | 2191 | nilfs_discontinued(nilfs)) { |
f7545144 | 2192 | nilfs_transaction_unlock(sb); |
9ff05123 RK |
2193 | err = nilfs_segctor_sync(sci); |
2194 | return err; | |
2195 | } | |
2196 | ||
693dd321 | 2197 | spin_lock(&nilfs->ns_inode_lock); |
9ff05123 RK |
2198 | if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && |
2199 | !test_bit(NILFS_I_BUSY, &ii->i_state)) { | |
693dd321 | 2200 | spin_unlock(&nilfs->ns_inode_lock); |
f7545144 | 2201 | nilfs_transaction_unlock(sb); |
9ff05123 RK |
2202 | return 0; |
2203 | } | |
693dd321 | 2204 | spin_unlock(&nilfs->ns_inode_lock); |
f30bf3e4 RK |
2205 | sci->sc_dsync_inode = ii; |
2206 | sci->sc_dsync_start = start; | |
2207 | sci->sc_dsync_end = end; | |
9ff05123 RK |
2208 | |
2209 | err = nilfs_segctor_do_construct(sci, SC_LSEG_DSYNC); | |
2210 | ||
f7545144 | 2211 | nilfs_transaction_unlock(sb); |
9ff05123 RK |
2212 | return err; |
2213 | } | |
2214 | ||
9ff05123 RK |
2215 | #define FLUSH_FILE_BIT (0x1) /* data file only */ |
2216 | #define FLUSH_DAT_BIT (1 << NILFS_DAT_INO) /* DAT only */ | |
2217 | ||
dcd76186 RK |
2218 | /** |
2219 | * nilfs_segctor_accept - record accepted sequence count of log-write requests | |
2220 | * @sci: segment constructor object | |
2221 | */ | |
2222 | static void nilfs_segctor_accept(struct nilfs_sc_info *sci) | |
9ff05123 | 2223 | { |
9ff05123 | 2224 | spin_lock(&sci->sc_state_lock); |
dcd76186 | 2225 | sci->sc_seq_accepted = sci->sc_seq_request; |
9ff05123 | 2226 | spin_unlock(&sci->sc_state_lock); |
fdce895e | 2227 | del_timer_sync(&sci->sc_timer); |
9ff05123 RK |
2228 | } |
2229 | ||
dcd76186 RK |
2230 | /** |
2231 | * nilfs_segctor_notify - notify the result of request to caller threads | |
2232 | * @sci: segment constructor object | |
2233 | * @mode: mode of log forming | |
2234 | * @err: error code to be notified | |
2235 | */ | |
2236 | static void nilfs_segctor_notify(struct nilfs_sc_info *sci, int mode, int err) | |
9ff05123 RK |
2237 | { |
2238 | /* Clear requests (even when the construction failed) */ | |
2239 | spin_lock(&sci->sc_state_lock); | |
2240 | ||
dcd76186 | 2241 | if (mode == SC_LSEG_SR) { |
aeda7f63 | 2242 | sci->sc_state &= ~NILFS_SEGCTOR_COMMIT; |
dcd76186 RK |
2243 | sci->sc_seq_done = sci->sc_seq_accepted; |
2244 | nilfs_segctor_wakeup(sci, err); | |
9ff05123 | 2245 | sci->sc_flush_request = 0; |
aeda7f63 | 2246 | } else { |
dcd76186 | 2247 | if (mode == SC_FLUSH_FILE) |
aeda7f63 | 2248 | sci->sc_flush_request &= ~FLUSH_FILE_BIT; |
dcd76186 | 2249 | else if (mode == SC_FLUSH_DAT) |
aeda7f63 RK |
2250 | sci->sc_flush_request &= ~FLUSH_DAT_BIT; |
2251 | ||
2252 | /* re-enable timer if checkpoint creation was not done */ | |
fdce895e LH |
2253 | if ((sci->sc_state & NILFS_SEGCTOR_COMMIT) && |
2254 | time_before(jiffies, sci->sc_timer.expires)) | |
2255 | add_timer(&sci->sc_timer); | |
aeda7f63 | 2256 | } |
9ff05123 RK |
2257 | spin_unlock(&sci->sc_state_lock); |
2258 | } | |
2259 | ||
dcd76186 RK |
2260 | /** |
2261 | * nilfs_segctor_construct - form logs and write them to disk | |
2262 | * @sci: segment constructor object | |
2263 | * @mode: mode of log forming | |
2264 | */ | |
2265 | static int nilfs_segctor_construct(struct nilfs_sc_info *sci, int mode) | |
9ff05123 | 2266 | { |
e3154e97 | 2267 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
d26493b6 | 2268 | struct nilfs_super_block **sbp; |
9ff05123 RK |
2269 | int err = 0; |
2270 | ||
dcd76186 RK |
2271 | nilfs_segctor_accept(sci); |
2272 | ||
9ff05123 | 2273 | if (nilfs_discontinued(nilfs)) |
dcd76186 RK |
2274 | mode = SC_LSEG_SR; |
2275 | if (!nilfs_segctor_confirm(sci)) | |
2276 | err = nilfs_segctor_do_construct(sci, mode); | |
2277 | ||
9ff05123 | 2278 | if (likely(!err)) { |
dcd76186 | 2279 | if (mode != SC_FLUSH_DAT) |
9ff05123 RK |
2280 | atomic_set(&nilfs->ns_ndirtyblks, 0); |
2281 | if (test_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags) && | |
2282 | nilfs_discontinued(nilfs)) { | |
2283 | down_write(&nilfs->ns_sem); | |
d26493b6 | 2284 | err = -EIO; |
f7545144 | 2285 | sbp = nilfs_prepare_super(sci->sc_super, |
b2ac86e1 JS |
2286 | nilfs_sb_will_flip(nilfs)); |
2287 | if (likely(sbp)) { | |
2288 | nilfs_set_log_cursor(sbp[0], nilfs); | |
f7545144 RK |
2289 | err = nilfs_commit_super(sci->sc_super, |
2290 | NILFS_SB_COMMIT); | |
b2ac86e1 | 2291 | } |
9ff05123 RK |
2292 | up_write(&nilfs->ns_sem); |
2293 | } | |
2294 | } | |
dcd76186 RK |
2295 | |
2296 | nilfs_segctor_notify(sci, mode, err); | |
9ff05123 RK |
2297 | return err; |
2298 | } | |
2299 | ||
2300 | static void nilfs_construction_timeout(unsigned long data) | |
2301 | { | |
2302 | struct task_struct *p = (struct task_struct *)data; | |
2303 | wake_up_process(p); | |
2304 | } | |
2305 | ||
2306 | static void | |
2307 | nilfs_remove_written_gcinodes(struct the_nilfs *nilfs, struct list_head *head) | |
2308 | { | |
2309 | struct nilfs_inode_info *ii, *n; | |
2310 | ||
2311 | list_for_each_entry_safe(ii, n, head, i_dirty) { | |
2312 | if (!test_bit(NILFS_I_UPDATED, &ii->i_state)) | |
2313 | continue; | |
9ff05123 | 2314 | list_del_init(&ii->i_dirty); |
fbb24a3a RK |
2315 | truncate_inode_pages(&ii->vfs_inode.i_data, 0); |
2316 | nilfs_btnode_cache_clear(&ii->i_btnode_cache); | |
263d90ce | 2317 | iput(&ii->vfs_inode); |
9ff05123 RK |
2318 | } |
2319 | } | |
2320 | ||
4f6b8288 RK |
2321 | int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv, |
2322 | void **kbufs) | |
9ff05123 | 2323 | { |
e3154e97 | 2324 | struct the_nilfs *nilfs = sb->s_fs_info; |
3fd3fe5a | 2325 | struct nilfs_sc_info *sci = nilfs->ns_writer; |
9ff05123 | 2326 | struct nilfs_transaction_info ti; |
9ff05123 RK |
2327 | int err; |
2328 | ||
2329 | if (unlikely(!sci)) | |
2330 | return -EROFS; | |
2331 | ||
f7545144 | 2332 | nilfs_transaction_lock(sb, &ti, 1); |
9ff05123 | 2333 | |
c1c1d709 | 2334 | err = nilfs_mdt_save_to_shadow_map(nilfs->ns_dat); |
9ff05123 RK |
2335 | if (unlikely(err)) |
2336 | goto out_unlock; | |
071cb4b8 | 2337 | |
4f6b8288 | 2338 | err = nilfs_ioctl_prepare_clean_segments(nilfs, argv, kbufs); |
c1c1d709 RK |
2339 | if (unlikely(err)) { |
2340 | nilfs_mdt_restore_from_shadow_map(nilfs->ns_dat); | |
9ff05123 | 2341 | goto out_unlock; |
c1c1d709 | 2342 | } |
9ff05123 | 2343 | |
071cb4b8 RK |
2344 | sci->sc_freesegs = kbufs[4]; |
2345 | sci->sc_nfreesegs = argv[4].v_nmembs; | |
0935db74 | 2346 | list_splice_tail_init(&nilfs->ns_gc_inodes, &sci->sc_gc_inodes); |
9ff05123 RK |
2347 | |
2348 | for (;;) { | |
dcd76186 | 2349 | err = nilfs_segctor_construct(sci, SC_LSEG_SR); |
9ff05123 | 2350 | nilfs_remove_written_gcinodes(nilfs, &sci->sc_gc_inodes); |
9ff05123 RK |
2351 | |
2352 | if (likely(!err)) | |
2353 | break; | |
2354 | ||
2355 | nilfs_warning(sb, __func__, | |
2356 | "segment construction failed. (err=%d)", err); | |
2357 | set_current_state(TASK_INTERRUPTIBLE); | |
2358 | schedule_timeout(sci->sc_interval); | |
2359 | } | |
3b2ce58b | 2360 | if (nilfs_test_opt(nilfs, DISCARD)) { |
e902ec99 JS |
2361 | int ret = nilfs_discard_segments(nilfs, sci->sc_freesegs, |
2362 | sci->sc_nfreesegs); | |
2363 | if (ret) { | |
2364 | printk(KERN_WARNING | |
2365 | "NILFS warning: error %d on discard request, " | |
2366 | "turning discards off for the device\n", ret); | |
3b2ce58b | 2367 | nilfs_clear_opt(nilfs, DISCARD); |
e902ec99 JS |
2368 | } |
2369 | } | |
9ff05123 RK |
2370 | |
2371 | out_unlock: | |
071cb4b8 RK |
2372 | sci->sc_freesegs = NULL; |
2373 | sci->sc_nfreesegs = 0; | |
c1c1d709 | 2374 | nilfs_mdt_clear_shadow_map(nilfs->ns_dat); |
f7545144 | 2375 | nilfs_transaction_unlock(sb); |
9ff05123 RK |
2376 | return err; |
2377 | } | |
2378 | ||
2379 | static void nilfs_segctor_thread_construct(struct nilfs_sc_info *sci, int mode) | |
2380 | { | |
9ff05123 | 2381 | struct nilfs_transaction_info ti; |
9ff05123 | 2382 | |
f7545144 | 2383 | nilfs_transaction_lock(sci->sc_super, &ti, 0); |
dcd76186 | 2384 | nilfs_segctor_construct(sci, mode); |
9ff05123 RK |
2385 | |
2386 | /* | |
2387 | * Unclosed segment should be retried. We do this using sc_timer. | |
2388 | * Timeout of sc_timer will invoke complete construction which leads | |
2389 | * to close the current logical segment. | |
2390 | */ | |
2391 | if (test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) | |
2392 | nilfs_segctor_start_timer(sci); | |
2393 | ||
f7545144 | 2394 | nilfs_transaction_unlock(sci->sc_super); |
9ff05123 RK |
2395 | } |
2396 | ||
2397 | static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *sci) | |
2398 | { | |
2399 | int mode = 0; | |
2400 | int err; | |
2401 | ||
2402 | spin_lock(&sci->sc_state_lock); | |
2403 | mode = (sci->sc_flush_request & FLUSH_DAT_BIT) ? | |
2404 | SC_FLUSH_DAT : SC_FLUSH_FILE; | |
2405 | spin_unlock(&sci->sc_state_lock); | |
2406 | ||
2407 | if (mode) { | |
2408 | err = nilfs_segctor_do_construct(sci, mode); | |
2409 | ||
2410 | spin_lock(&sci->sc_state_lock); | |
2411 | sci->sc_flush_request &= (mode == SC_FLUSH_FILE) ? | |
2412 | ~FLUSH_FILE_BIT : ~FLUSH_DAT_BIT; | |
2413 | spin_unlock(&sci->sc_state_lock); | |
2414 | } | |
2415 | clear_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags); | |
2416 | } | |
2417 | ||
2418 | static int nilfs_segctor_flush_mode(struct nilfs_sc_info *sci) | |
2419 | { | |
2420 | if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) || | |
2421 | time_before(jiffies, sci->sc_lseg_stime + sci->sc_mjcp_freq)) { | |
2422 | if (!(sci->sc_flush_request & ~FLUSH_FILE_BIT)) | |
2423 | return SC_FLUSH_FILE; | |
2424 | else if (!(sci->sc_flush_request & ~FLUSH_DAT_BIT)) | |
2425 | return SC_FLUSH_DAT; | |
2426 | } | |
2427 | return SC_LSEG_SR; | |
2428 | } | |
2429 | ||
2430 | /** | |
2431 | * nilfs_segctor_thread - main loop of the segment constructor thread. | |
2432 | * @arg: pointer to a struct nilfs_sc_info. | |
2433 | * | |
2434 | * nilfs_segctor_thread() initializes a timer and serves as a daemon | |
2435 | * to execute segment constructions. | |
2436 | */ | |
2437 | static int nilfs_segctor_thread(void *arg) | |
2438 | { | |
2439 | struct nilfs_sc_info *sci = (struct nilfs_sc_info *)arg; | |
e3154e97 | 2440 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123 RK |
2441 | int timeout = 0; |
2442 | ||
fdce895e LH |
2443 | sci->sc_timer.data = (unsigned long)current; |
2444 | sci->sc_timer.function = nilfs_construction_timeout; | |
9ff05123 RK |
2445 | |
2446 | /* start sync. */ | |
2447 | sci->sc_task = current; | |
2448 | wake_up(&sci->sc_wait_task); /* for nilfs_segctor_start_thread() */ | |
2449 | printk(KERN_INFO | |
2450 | "segctord starting. Construction interval = %lu seconds, " | |
2451 | "CP frequency < %lu seconds\n", | |
2452 | sci->sc_interval / HZ, sci->sc_mjcp_freq / HZ); | |
2453 | ||
2454 | spin_lock(&sci->sc_state_lock); | |
2455 | loop: | |
2456 | for (;;) { | |
2457 | int mode; | |
2458 | ||
2459 | if (sci->sc_state & NILFS_SEGCTOR_QUIT) | |
2460 | goto end_thread; | |
2461 | ||
2462 | if (timeout || sci->sc_seq_request != sci->sc_seq_done) | |
2463 | mode = SC_LSEG_SR; | |
2464 | else if (!sci->sc_flush_request) | |
2465 | break; | |
2466 | else | |
2467 | mode = nilfs_segctor_flush_mode(sci); | |
2468 | ||
2469 | spin_unlock(&sci->sc_state_lock); | |
2470 | nilfs_segctor_thread_construct(sci, mode); | |
2471 | spin_lock(&sci->sc_state_lock); | |
2472 | timeout = 0; | |
2473 | } | |
2474 | ||
2475 | ||
2476 | if (freezing(current)) { | |
2477 | spin_unlock(&sci->sc_state_lock); | |
a0acae0e | 2478 | try_to_freeze(); |
9ff05123 RK |
2479 | spin_lock(&sci->sc_state_lock); |
2480 | } else { | |
2481 | DEFINE_WAIT(wait); | |
2482 | int should_sleep = 1; | |
2483 | ||
2484 | prepare_to_wait(&sci->sc_wait_daemon, &wait, | |
2485 | TASK_INTERRUPTIBLE); | |
2486 | ||
2487 | if (sci->sc_seq_request != sci->sc_seq_done) | |
2488 | should_sleep = 0; | |
2489 | else if (sci->sc_flush_request) | |
2490 | should_sleep = 0; | |
2491 | else if (sci->sc_state & NILFS_SEGCTOR_COMMIT) | |
2492 | should_sleep = time_before(jiffies, | |
fdce895e | 2493 | sci->sc_timer.expires); |
9ff05123 RK |
2494 | |
2495 | if (should_sleep) { | |
2496 | spin_unlock(&sci->sc_state_lock); | |
2497 | schedule(); | |
2498 | spin_lock(&sci->sc_state_lock); | |
2499 | } | |
2500 | finish_wait(&sci->sc_wait_daemon, &wait); | |
2501 | timeout = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) && | |
fdce895e | 2502 | time_after_eq(jiffies, sci->sc_timer.expires)); |
e605f0a7 RK |
2503 | |
2504 | if (nilfs_sb_dirty(nilfs) && nilfs_sb_need_update(nilfs)) | |
1dfa2710 | 2505 | set_nilfs_discontinued(nilfs); |
9ff05123 RK |
2506 | } |
2507 | goto loop; | |
2508 | ||
2509 | end_thread: | |
2510 | spin_unlock(&sci->sc_state_lock); | |
9ff05123 RK |
2511 | |
2512 | /* end sync. */ | |
2513 | sci->sc_task = NULL; | |
2514 | wake_up(&sci->sc_wait_task); /* for nilfs_segctor_kill_thread() */ | |
2515 | return 0; | |
2516 | } | |
2517 | ||
2518 | static int nilfs_segctor_start_thread(struct nilfs_sc_info *sci) | |
2519 | { | |
2520 | struct task_struct *t; | |
2521 | ||
2522 | t = kthread_run(nilfs_segctor_thread, sci, "segctord"); | |
2523 | if (IS_ERR(t)) { | |
2524 | int err = PTR_ERR(t); | |
2525 | ||
2526 | printk(KERN_ERR "NILFS: error %d creating segctord thread\n", | |
2527 | err); | |
2528 | return err; | |
2529 | } | |
2530 | wait_event(sci->sc_wait_task, sci->sc_task != NULL); | |
2531 | return 0; | |
2532 | } | |
2533 | ||
2534 | static void nilfs_segctor_kill_thread(struct nilfs_sc_info *sci) | |
6b81e14e JS |
2535 | __acquires(&sci->sc_state_lock) |
2536 | __releases(&sci->sc_state_lock) | |
9ff05123 RK |
2537 | { |
2538 | sci->sc_state |= NILFS_SEGCTOR_QUIT; | |
2539 | ||
2540 | while (sci->sc_task) { | |
2541 | wake_up(&sci->sc_wait_daemon); | |
2542 | spin_unlock(&sci->sc_state_lock); | |
2543 | wait_event(sci->sc_wait_task, sci->sc_task == NULL); | |
2544 | spin_lock(&sci->sc_state_lock); | |
2545 | } | |
2546 | } | |
2547 | ||
9ff05123 RK |
2548 | /* |
2549 | * Setup & clean-up functions | |
2550 | */ | |
f7545144 | 2551 | static struct nilfs_sc_info *nilfs_segctor_new(struct super_block *sb, |
e912a5b6 | 2552 | struct nilfs_root *root) |
9ff05123 | 2553 | { |
e3154e97 | 2554 | struct the_nilfs *nilfs = sb->s_fs_info; |
9ff05123 RK |
2555 | struct nilfs_sc_info *sci; |
2556 | ||
2557 | sci = kzalloc(sizeof(*sci), GFP_KERNEL); | |
2558 | if (!sci) | |
2559 | return NULL; | |
2560 | ||
f7545144 | 2561 | sci->sc_super = sb; |
9ff05123 | 2562 | |
e912a5b6 RK |
2563 | nilfs_get_root(root); |
2564 | sci->sc_root = root; | |
2565 | ||
9ff05123 RK |
2566 | init_waitqueue_head(&sci->sc_wait_request); |
2567 | init_waitqueue_head(&sci->sc_wait_daemon); | |
2568 | init_waitqueue_head(&sci->sc_wait_task); | |
2569 | spin_lock_init(&sci->sc_state_lock); | |
2570 | INIT_LIST_HEAD(&sci->sc_dirty_files); | |
2571 | INIT_LIST_HEAD(&sci->sc_segbufs); | |
a694291a | 2572 | INIT_LIST_HEAD(&sci->sc_write_logs); |
9ff05123 | 2573 | INIT_LIST_HEAD(&sci->sc_gc_inodes); |
fdce895e | 2574 | init_timer(&sci->sc_timer); |
9ff05123 RK |
2575 | |
2576 | sci->sc_interval = HZ * NILFS_SC_DEFAULT_TIMEOUT; | |
2577 | sci->sc_mjcp_freq = HZ * NILFS_SC_DEFAULT_SR_FREQ; | |
2578 | sci->sc_watermark = NILFS_SC_DEFAULT_WATERMARK; | |
2579 | ||
574e6c31 | 2580 | if (nilfs->ns_interval) |
071d73cf | 2581 | sci->sc_interval = HZ * nilfs->ns_interval; |
574e6c31 RK |
2582 | if (nilfs->ns_watermark) |
2583 | sci->sc_watermark = nilfs->ns_watermark; | |
9ff05123 RK |
2584 | return sci; |
2585 | } | |
2586 | ||
2587 | static void nilfs_segctor_write_out(struct nilfs_sc_info *sci) | |
2588 | { | |
2589 | int ret, retrycount = NILFS_SC_CLEANUP_RETRY; | |
2590 | ||
2591 | /* The segctord thread was stopped and its timer was removed. | |
2592 | But some tasks remain. */ | |
2593 | do { | |
9ff05123 | 2594 | struct nilfs_transaction_info ti; |
9ff05123 | 2595 | |
f7545144 | 2596 | nilfs_transaction_lock(sci->sc_super, &ti, 0); |
dcd76186 | 2597 | ret = nilfs_segctor_construct(sci, SC_LSEG_SR); |
f7545144 | 2598 | nilfs_transaction_unlock(sci->sc_super); |
9ff05123 RK |
2599 | |
2600 | } while (ret && retrycount-- > 0); | |
2601 | } | |
2602 | ||
2603 | /** | |
2604 | * nilfs_segctor_destroy - destroy the segment constructor. | |
2605 | * @sci: nilfs_sc_info | |
2606 | * | |
2607 | * nilfs_segctor_destroy() kills the segctord thread and frees | |
2608 | * the nilfs_sc_info struct. | |
2609 | * Caller must hold the segment semaphore. | |
2610 | */ | |
2611 | static void nilfs_segctor_destroy(struct nilfs_sc_info *sci) | |
2612 | { | |
e3154e97 | 2613 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123 RK |
2614 | int flag; |
2615 | ||
693dd321 | 2616 | up_write(&nilfs->ns_segctor_sem); |
9ff05123 RK |
2617 | |
2618 | spin_lock(&sci->sc_state_lock); | |
2619 | nilfs_segctor_kill_thread(sci); | |
2620 | flag = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) || sci->sc_flush_request | |
2621 | || sci->sc_seq_request != sci->sc_seq_done); | |
2622 | spin_unlock(&sci->sc_state_lock); | |
2623 | ||
3256a055 | 2624 | if (flag || !nilfs_segctor_confirm(sci)) |
9ff05123 RK |
2625 | nilfs_segctor_write_out(sci); |
2626 | ||
9ff05123 | 2627 | if (!list_empty(&sci->sc_dirty_files)) { |
693dd321 | 2628 | nilfs_warning(sci->sc_super, __func__, |
9ff05123 | 2629 | "dirty file(s) after the final construction\n"); |
693dd321 | 2630 | nilfs_dispose_list(nilfs, &sci->sc_dirty_files, 1); |
9ff05123 | 2631 | } |
9ff05123 | 2632 | |
1f5abe7e | 2633 | WARN_ON(!list_empty(&sci->sc_segbufs)); |
a694291a | 2634 | WARN_ON(!list_empty(&sci->sc_write_logs)); |
9ff05123 | 2635 | |
e912a5b6 RK |
2636 | nilfs_put_root(sci->sc_root); |
2637 | ||
693dd321 | 2638 | down_write(&nilfs->ns_segctor_sem); |
9ff05123 | 2639 | |
fdce895e | 2640 | del_timer_sync(&sci->sc_timer); |
9ff05123 RK |
2641 | kfree(sci); |
2642 | } | |
2643 | ||
2644 | /** | |
f7545144 RK |
2645 | * nilfs_attach_log_writer - attach log writer |
2646 | * @sb: super block instance | |
e912a5b6 | 2647 | * @root: root object of the current filesystem tree |
9ff05123 | 2648 | * |
f7545144 RK |
2649 | * This allocates a log writer object, initializes it, and starts the |
2650 | * log writer. | |
9ff05123 RK |
2651 | * |
2652 | * Return Value: On success, 0 is returned. On error, one of the following | |
2653 | * negative error code is returned. | |
2654 | * | |
2655 | * %-ENOMEM - Insufficient memory available. | |
2656 | */ | |
f7545144 | 2657 | int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root) |
9ff05123 | 2658 | { |
e3154e97 | 2659 | struct the_nilfs *nilfs = sb->s_fs_info; |
9ff05123 RK |
2660 | int err; |
2661 | ||
3fd3fe5a | 2662 | if (nilfs->ns_writer) { |
fe5f171b RK |
2663 | /* |
2664 | * This happens if the filesystem was remounted | |
2665 | * read/write after nilfs_error degenerated it into a | |
2666 | * read-only mount. | |
2667 | */ | |
f7545144 | 2668 | nilfs_detach_log_writer(sb); |
fe5f171b RK |
2669 | } |
2670 | ||
f7545144 | 2671 | nilfs->ns_writer = nilfs_segctor_new(sb, root); |
3fd3fe5a | 2672 | if (!nilfs->ns_writer) |
9ff05123 RK |
2673 | return -ENOMEM; |
2674 | ||
3fd3fe5a | 2675 | err = nilfs_segctor_start_thread(nilfs->ns_writer); |
9ff05123 | 2676 | if (err) { |
3fd3fe5a RK |
2677 | kfree(nilfs->ns_writer); |
2678 | nilfs->ns_writer = NULL; | |
9ff05123 RK |
2679 | } |
2680 | return err; | |
2681 | } | |
2682 | ||
2683 | /** | |
f7545144 RK |
2684 | * nilfs_detach_log_writer - destroy log writer |
2685 | * @sb: super block instance | |
9ff05123 | 2686 | * |
f7545144 RK |
2687 | * This kills log writer daemon, frees the log writer object, and |
2688 | * destroys list of dirty files. | |
9ff05123 | 2689 | */ |
f7545144 | 2690 | void nilfs_detach_log_writer(struct super_block *sb) |
9ff05123 | 2691 | { |
e3154e97 | 2692 | struct the_nilfs *nilfs = sb->s_fs_info; |
9ff05123 RK |
2693 | LIST_HEAD(garbage_list); |
2694 | ||
2695 | down_write(&nilfs->ns_segctor_sem); | |
3fd3fe5a RK |
2696 | if (nilfs->ns_writer) { |
2697 | nilfs_segctor_destroy(nilfs->ns_writer); | |
2698 | nilfs->ns_writer = NULL; | |
9ff05123 RK |
2699 | } |
2700 | ||
2701 | /* Force to free the list of dirty files */ | |
693dd321 RK |
2702 | spin_lock(&nilfs->ns_inode_lock); |
2703 | if (!list_empty(&nilfs->ns_dirty_files)) { | |
2704 | list_splice_init(&nilfs->ns_dirty_files, &garbage_list); | |
f7545144 RK |
2705 | nilfs_warning(sb, __func__, |
2706 | "Hit dirty file after stopped log writer\n"); | |
9ff05123 | 2707 | } |
693dd321 | 2708 | spin_unlock(&nilfs->ns_inode_lock); |
9ff05123 RK |
2709 | up_write(&nilfs->ns_segctor_sem); |
2710 | ||
693dd321 | 2711 | nilfs_dispose_list(nilfs, &garbage_list, 1); |
9ff05123 | 2712 | } |