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