]>
Commit | Line | Data |
---|---|---|
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 *); | |
107 | static void nilfs_dispose_list(struct nilfs_sb_info *, struct list_head *, | |
108 | int); | |
109 | ||
110 | #define nilfs_cnt32_gt(a, b) \ | |
111 | (typecheck(__u32, a) && typecheck(__u32, b) && \ | |
112 | ((__s32)(b) - (__s32)(a) < 0)) | |
113 | #define nilfs_cnt32_ge(a, b) \ | |
114 | (typecheck(__u32, a) && typecheck(__u32, b) && \ | |
115 | ((__s32)(a) - (__s32)(b) >= 0)) | |
116 | #define nilfs_cnt32_lt(a, b) nilfs_cnt32_gt(b, a) | |
117 | #define nilfs_cnt32_le(a, b) nilfs_cnt32_ge(b, a) | |
118 | ||
9ff05123 RK |
119 | static int nilfs_prepare_segment_lock(struct nilfs_transaction_info *ti) |
120 | { | |
121 | struct nilfs_transaction_info *cur_ti = current->journal_info; | |
122 | void *save = NULL; | |
123 | ||
124 | if (cur_ti) { | |
125 | if (cur_ti->ti_magic == NILFS_TI_MAGIC) | |
126 | return ++cur_ti->ti_count; | |
127 | else { | |
128 | /* | |
129 | * If journal_info field is occupied by other FS, | |
47420c79 RK |
130 | * it is saved and will be restored on |
131 | * nilfs_transaction_commit(). | |
9ff05123 RK |
132 | */ |
133 | printk(KERN_WARNING | |
134 | "NILFS warning: journal info from a different " | |
135 | "FS\n"); | |
136 | save = current->journal_info; | |
137 | } | |
138 | } | |
139 | if (!ti) { | |
140 | ti = kmem_cache_alloc(nilfs_transaction_cachep, GFP_NOFS); | |
141 | if (!ti) | |
142 | return -ENOMEM; | |
143 | ti->ti_flags = NILFS_TI_DYNAMIC_ALLOC; | |
144 | } else { | |
145 | ti->ti_flags = 0; | |
146 | } | |
147 | ti->ti_count = 0; | |
148 | ti->ti_save = save; | |
149 | ti->ti_magic = NILFS_TI_MAGIC; | |
150 | current->journal_info = ti; | |
151 | return 0; | |
152 | } | |
153 | ||
154 | /** | |
155 | * nilfs_transaction_begin - start indivisible file operations. | |
156 | * @sb: super block | |
157 | * @ti: nilfs_transaction_info | |
158 | * @vacancy_check: flags for vacancy rate checks | |
159 | * | |
160 | * nilfs_transaction_begin() acquires a reader/writer semaphore, called | |
161 | * the segment semaphore, to make a segment construction and write tasks | |
47420c79 | 162 | * exclusive. The function is used with nilfs_transaction_commit() in pairs. |
9ff05123 RK |
163 | * The region enclosed by these two functions can be nested. To avoid a |
164 | * deadlock, the semaphore is only acquired or released in the outermost call. | |
165 | * | |
166 | * This function allocates a nilfs_transaction_info struct to keep context | |
167 | * information on it. It is initialized and hooked onto the current task in | |
168 | * the outermost call. If a pre-allocated struct is given to @ti, it is used | |
7a65004b | 169 | * instead; otherwise a new struct is assigned from a slab. |
9ff05123 RK |
170 | * |
171 | * When @vacancy_check flag is set, this function will check the amount of | |
172 | * free space, and will wait for the GC to reclaim disk space if low capacity. | |
173 | * | |
174 | * Return Value: On success, 0 is returned. On error, one of the following | |
175 | * negative error code is returned. | |
176 | * | |
177 | * %-ENOMEM - Insufficient memory available. | |
178 | * | |
9ff05123 RK |
179 | * %-ENOSPC - No space left on device |
180 | */ | |
181 | int nilfs_transaction_begin(struct super_block *sb, | |
182 | struct nilfs_transaction_info *ti, | |
183 | int vacancy_check) | |
184 | { | |
185 | struct nilfs_sb_info *sbi; | |
186 | struct the_nilfs *nilfs; | |
187 | int ret = nilfs_prepare_segment_lock(ti); | |
188 | ||
189 | if (unlikely(ret < 0)) | |
190 | return ret; | |
191 | if (ret > 0) | |
192 | return 0; | |
193 | ||
194 | sbi = NILFS_SB(sb); | |
195 | nilfs = sbi->s_nilfs; | |
196 | down_read(&nilfs->ns_segctor_sem); | |
197 | if (vacancy_check && nilfs_near_disk_full(nilfs)) { | |
198 | up_read(&nilfs->ns_segctor_sem); | |
199 | ret = -ENOSPC; | |
200 | goto failed; | |
201 | } | |
202 | return 0; | |
203 | ||
204 | failed: | |
205 | ti = current->journal_info; | |
206 | current->journal_info = ti->ti_save; | |
207 | if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC) | |
208 | kmem_cache_free(nilfs_transaction_cachep, ti); | |
209 | return ret; | |
210 | } | |
211 | ||
212 | /** | |
47420c79 | 213 | * nilfs_transaction_commit - commit indivisible file operations. |
9ff05123 | 214 | * @sb: super block |
9ff05123 | 215 | * |
47420c79 RK |
216 | * nilfs_transaction_commit() releases the read semaphore which is |
217 | * acquired by nilfs_transaction_begin(). This is only performed | |
218 | * in outermost call of this function. If a commit flag is set, | |
219 | * nilfs_transaction_commit() sets a timer to start the segment | |
220 | * constructor. If a sync flag is set, it starts construction | |
221 | * directly. | |
9ff05123 | 222 | */ |
47420c79 | 223 | int nilfs_transaction_commit(struct super_block *sb) |
9ff05123 RK |
224 | { |
225 | struct nilfs_transaction_info *ti = current->journal_info; | |
226 | struct nilfs_sb_info *sbi; | |
227 | struct nilfs_sc_info *sci; | |
228 | int err = 0; | |
229 | ||
230 | BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC); | |
47420c79 | 231 | ti->ti_flags |= NILFS_TI_COMMIT; |
9ff05123 RK |
232 | if (ti->ti_count > 0) { |
233 | ti->ti_count--; | |
234 | return 0; | |
235 | } | |
236 | sbi = NILFS_SB(sb); | |
237 | sci = NILFS_SC(sbi); | |
238 | if (sci != NULL) { | |
239 | if (ti->ti_flags & NILFS_TI_COMMIT) | |
240 | nilfs_segctor_start_timer(sci); | |
241 | if (atomic_read(&sbi->s_nilfs->ns_ndirtyblks) > | |
242 | sci->sc_watermark) | |
243 | nilfs_segctor_do_flush(sci, 0); | |
244 | } | |
245 | up_read(&sbi->s_nilfs->ns_segctor_sem); | |
246 | current->journal_info = ti->ti_save; | |
247 | ||
248 | if (ti->ti_flags & NILFS_TI_SYNC) | |
249 | err = nilfs_construct_segment(sb); | |
250 | if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC) | |
251 | kmem_cache_free(nilfs_transaction_cachep, ti); | |
252 | return err; | |
253 | } | |
254 | ||
47420c79 RK |
255 | void nilfs_transaction_abort(struct super_block *sb) |
256 | { | |
257 | struct nilfs_transaction_info *ti = current->journal_info; | |
258 | ||
259 | BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC); | |
260 | if (ti->ti_count > 0) { | |
261 | ti->ti_count--; | |
262 | return; | |
263 | } | |
264 | up_read(&NILFS_SB(sb)->s_nilfs->ns_segctor_sem); | |
265 | ||
266 | current->journal_info = ti->ti_save; | |
267 | if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC) | |
268 | kmem_cache_free(nilfs_transaction_cachep, ti); | |
269 | } | |
270 | ||
9ff05123 RK |
271 | void nilfs_relax_pressure_in_lock(struct super_block *sb) |
272 | { | |
273 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
274 | struct nilfs_sc_info *sci = NILFS_SC(sbi); | |
275 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
276 | ||
277 | if (!sci || !sci->sc_flush_request) | |
278 | return; | |
279 | ||
280 | set_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags); | |
281 | up_read(&nilfs->ns_segctor_sem); | |
282 | ||
283 | down_write(&nilfs->ns_segctor_sem); | |
284 | if (sci->sc_flush_request && | |
285 | test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags)) { | |
286 | struct nilfs_transaction_info *ti = current->journal_info; | |
287 | ||
288 | ti->ti_flags |= NILFS_TI_WRITER; | |
289 | nilfs_segctor_do_immediate_flush(sci); | |
290 | ti->ti_flags &= ~NILFS_TI_WRITER; | |
291 | } | |
292 | downgrade_write(&nilfs->ns_segctor_sem); | |
293 | } | |
294 | ||
295 | static void nilfs_transaction_lock(struct nilfs_sb_info *sbi, | |
296 | struct nilfs_transaction_info *ti, | |
297 | int gcflag) | |
298 | { | |
299 | struct nilfs_transaction_info *cur_ti = current->journal_info; | |
300 | ||
1f5abe7e | 301 | WARN_ON(cur_ti); |
9ff05123 RK |
302 | ti->ti_flags = NILFS_TI_WRITER; |
303 | ti->ti_count = 0; | |
304 | ti->ti_save = cur_ti; | |
305 | ti->ti_magic = NILFS_TI_MAGIC; | |
306 | INIT_LIST_HEAD(&ti->ti_garbage); | |
307 | current->journal_info = ti; | |
308 | ||
309 | for (;;) { | |
310 | down_write(&sbi->s_nilfs->ns_segctor_sem); | |
311 | if (!test_bit(NILFS_SC_PRIOR_FLUSH, &NILFS_SC(sbi)->sc_flags)) | |
312 | break; | |
313 | ||
314 | nilfs_segctor_do_immediate_flush(NILFS_SC(sbi)); | |
315 | ||
316 | up_write(&sbi->s_nilfs->ns_segctor_sem); | |
317 | yield(); | |
318 | } | |
319 | if (gcflag) | |
320 | ti->ti_flags |= NILFS_TI_GC; | |
321 | } | |
322 | ||
323 | static void nilfs_transaction_unlock(struct nilfs_sb_info *sbi) | |
324 | { | |
325 | struct nilfs_transaction_info *ti = current->journal_info; | |
326 | ||
327 | BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC); | |
328 | BUG_ON(ti->ti_count > 0); | |
329 | ||
330 | up_write(&sbi->s_nilfs->ns_segctor_sem); | |
331 | current->journal_info = ti->ti_save; | |
332 | if (!list_empty(&ti->ti_garbage)) | |
333 | nilfs_dispose_list(sbi, &ti->ti_garbage, 0); | |
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 RK |
430 | |
431 | if (inode->i_sb && !test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags)) | |
432 | set_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags); | |
9ff05123 RK |
433 | /* skip finfo */ |
434 | } | |
435 | ||
436 | static void nilfs_segctor_end_finfo(struct nilfs_sc_info *sci, | |
437 | struct inode *inode) | |
438 | { | |
439 | struct nilfs_finfo *finfo; | |
440 | struct nilfs_inode_info *ii; | |
441 | struct nilfs_segment_buffer *segbuf; | |
6c43f410 | 442 | __u64 cno; |
9ff05123 RK |
443 | |
444 | if (sci->sc_blk_cnt == 0) | |
445 | return; | |
446 | ||
447 | ii = NILFS_I(inode); | |
6c43f410 RK |
448 | |
449 | if (test_bit(NILFS_I_GCINODE, &ii->i_state)) | |
450 | cno = ii->i_cno; | |
451 | else if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) | |
452 | cno = 0; | |
453 | else | |
454 | cno = sci->sc_cno; | |
455 | ||
9ff05123 RK |
456 | finfo = nilfs_segctor_map_segsum_entry(sci, &sci->sc_finfo_ptr, |
457 | sizeof(*finfo)); | |
458 | finfo->fi_ino = cpu_to_le64(inode->i_ino); | |
459 | finfo->fi_nblocks = cpu_to_le32(sci->sc_blk_cnt); | |
460 | finfo->fi_ndatablk = cpu_to_le32(sci->sc_datablk_cnt); | |
6c43f410 | 461 | finfo->fi_cno = cpu_to_le64(cno); |
9ff05123 RK |
462 | |
463 | segbuf = sci->sc_curseg; | |
464 | segbuf->sb_sum.sumbytes = sci->sc_binfo_ptr.offset + | |
465 | sci->sc_super->s_blocksize * (segbuf->sb_sum.nsumblk - 1); | |
466 | sci->sc_finfo_ptr = sci->sc_binfo_ptr; | |
467 | sci->sc_blk_cnt = sci->sc_datablk_cnt = 0; | |
468 | } | |
469 | ||
470 | static int nilfs_segctor_add_file_block(struct nilfs_sc_info *sci, | |
471 | struct buffer_head *bh, | |
472 | struct inode *inode, | |
473 | unsigned binfo_size) | |
474 | { | |
475 | struct nilfs_segment_buffer *segbuf; | |
476 | int required, err = 0; | |
477 | ||
478 | retry: | |
479 | segbuf = sci->sc_curseg; | |
480 | required = nilfs_segctor_segsum_block_required( | |
481 | sci, &sci->sc_binfo_ptr, binfo_size); | |
482 | if (segbuf->sb_sum.nblocks + required + 1 > segbuf->sb_rest_blocks) { | |
483 | nilfs_segctor_end_finfo(sci, inode); | |
484 | err = nilfs_segctor_feed_segment(sci); | |
485 | if (err) | |
486 | return err; | |
487 | goto retry; | |
488 | } | |
489 | if (unlikely(required)) { | |
490 | err = nilfs_segbuf_extend_segsum(segbuf); | |
491 | if (unlikely(err)) | |
492 | goto failed; | |
493 | } | |
494 | if (sci->sc_blk_cnt == 0) | |
495 | nilfs_segctor_begin_finfo(sci, inode); | |
496 | ||
497 | nilfs_segctor_map_segsum_entry(sci, &sci->sc_binfo_ptr, binfo_size); | |
498 | /* Substitution to vblocknr is delayed until update_blocknr() */ | |
499 | nilfs_segbuf_add_file_buffer(segbuf, bh); | |
500 | sci->sc_blk_cnt++; | |
501 | failed: | |
502 | return err; | |
503 | } | |
504 | ||
505 | static int nilfs_handle_bmap_error(int err, const char *fname, | |
506 | struct inode *inode, struct super_block *sb) | |
507 | { | |
508 | if (err == -EINVAL) { | |
509 | nilfs_error(sb, fname, "broken bmap (inode=%lu)\n", | |
510 | inode->i_ino); | |
511 | err = -EIO; | |
512 | } | |
513 | return err; | |
514 | } | |
515 | ||
516 | /* | |
517 | * Callback functions that enumerate, mark, and collect dirty blocks | |
518 | */ | |
519 | static int nilfs_collect_file_data(struct nilfs_sc_info *sci, | |
520 | struct buffer_head *bh, struct inode *inode) | |
521 | { | |
522 | int err; | |
523 | ||
9ff05123 RK |
524 | err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh); |
525 | if (unlikely(err < 0)) | |
526 | return nilfs_handle_bmap_error(err, __func__, inode, | |
527 | sci->sc_super); | |
528 | ||
529 | err = nilfs_segctor_add_file_block(sci, bh, inode, | |
530 | sizeof(struct nilfs_binfo_v)); | |
531 | if (!err) | |
532 | sci->sc_datablk_cnt++; | |
533 | return err; | |
534 | } | |
535 | ||
536 | static int nilfs_collect_file_node(struct nilfs_sc_info *sci, | |
537 | struct buffer_head *bh, | |
538 | struct inode *inode) | |
539 | { | |
540 | int err; | |
541 | ||
9ff05123 RK |
542 | err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh); |
543 | if (unlikely(err < 0)) | |
544 | return nilfs_handle_bmap_error(err, __func__, inode, | |
545 | sci->sc_super); | |
546 | return 0; | |
547 | } | |
548 | ||
549 | static int nilfs_collect_file_bmap(struct nilfs_sc_info *sci, | |
550 | struct buffer_head *bh, | |
551 | struct inode *inode) | |
552 | { | |
1f5abe7e | 553 | WARN_ON(!buffer_dirty(bh)); |
9ff05123 RK |
554 | return nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64)); |
555 | } | |
556 | ||
557 | static void nilfs_write_file_data_binfo(struct nilfs_sc_info *sci, | |
558 | struct nilfs_segsum_pointer *ssp, | |
559 | union nilfs_binfo *binfo) | |
560 | { | |
561 | struct nilfs_binfo_v *binfo_v = nilfs_segctor_map_segsum_entry( | |
562 | sci, ssp, sizeof(*binfo_v)); | |
563 | *binfo_v = binfo->bi_v; | |
564 | } | |
565 | ||
566 | static void nilfs_write_file_node_binfo(struct nilfs_sc_info *sci, | |
567 | struct nilfs_segsum_pointer *ssp, | |
568 | union nilfs_binfo *binfo) | |
569 | { | |
570 | __le64 *vblocknr = nilfs_segctor_map_segsum_entry( | |
571 | sci, ssp, sizeof(*vblocknr)); | |
572 | *vblocknr = binfo->bi_v.bi_vblocknr; | |
573 | } | |
574 | ||
4e819509 | 575 | static struct nilfs_sc_operations nilfs_sc_file_ops = { |
9ff05123 RK |
576 | .collect_data = nilfs_collect_file_data, |
577 | .collect_node = nilfs_collect_file_node, | |
578 | .collect_bmap = nilfs_collect_file_bmap, | |
579 | .write_data_binfo = nilfs_write_file_data_binfo, | |
580 | .write_node_binfo = nilfs_write_file_node_binfo, | |
581 | }; | |
582 | ||
583 | static int nilfs_collect_dat_data(struct nilfs_sc_info *sci, | |
584 | struct buffer_head *bh, struct inode *inode) | |
585 | { | |
586 | int err; | |
587 | ||
588 | err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh); | |
589 | if (unlikely(err < 0)) | |
590 | return nilfs_handle_bmap_error(err, __func__, inode, | |
591 | sci->sc_super); | |
592 | ||
593 | err = nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64)); | |
594 | if (!err) | |
595 | sci->sc_datablk_cnt++; | |
596 | return err; | |
597 | } | |
598 | ||
599 | static int nilfs_collect_dat_bmap(struct nilfs_sc_info *sci, | |
600 | struct buffer_head *bh, struct inode *inode) | |
601 | { | |
1f5abe7e | 602 | WARN_ON(!buffer_dirty(bh)); |
9ff05123 RK |
603 | return nilfs_segctor_add_file_block(sci, bh, inode, |
604 | sizeof(struct nilfs_binfo_dat)); | |
605 | } | |
606 | ||
607 | static void nilfs_write_dat_data_binfo(struct nilfs_sc_info *sci, | |
608 | struct nilfs_segsum_pointer *ssp, | |
609 | union nilfs_binfo *binfo) | |
610 | { | |
611 | __le64 *blkoff = nilfs_segctor_map_segsum_entry(sci, ssp, | |
612 | sizeof(*blkoff)); | |
613 | *blkoff = binfo->bi_dat.bi_blkoff; | |
614 | } | |
615 | ||
616 | static void nilfs_write_dat_node_binfo(struct nilfs_sc_info *sci, | |
617 | struct nilfs_segsum_pointer *ssp, | |
618 | union nilfs_binfo *binfo) | |
619 | { | |
620 | struct nilfs_binfo_dat *binfo_dat = | |
621 | nilfs_segctor_map_segsum_entry(sci, ssp, sizeof(*binfo_dat)); | |
622 | *binfo_dat = binfo->bi_dat; | |
623 | } | |
624 | ||
4e819509 | 625 | static struct nilfs_sc_operations nilfs_sc_dat_ops = { |
9ff05123 RK |
626 | .collect_data = nilfs_collect_dat_data, |
627 | .collect_node = nilfs_collect_file_node, | |
628 | .collect_bmap = nilfs_collect_dat_bmap, | |
629 | .write_data_binfo = nilfs_write_dat_data_binfo, | |
630 | .write_node_binfo = nilfs_write_dat_node_binfo, | |
631 | }; | |
632 | ||
4e819509 | 633 | static struct nilfs_sc_operations nilfs_sc_dsync_ops = { |
9ff05123 RK |
634 | .collect_data = nilfs_collect_file_data, |
635 | .collect_node = NULL, | |
636 | .collect_bmap = NULL, | |
637 | .write_data_binfo = nilfs_write_file_data_binfo, | |
638 | .write_node_binfo = NULL, | |
639 | }; | |
640 | ||
f30bf3e4 RK |
641 | static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode, |
642 | struct list_head *listp, | |
643 | size_t nlimit, | |
644 | loff_t start, loff_t end) | |
9ff05123 | 645 | { |
9ff05123 RK |
646 | struct address_space *mapping = inode->i_mapping; |
647 | struct pagevec pvec; | |
f30bf3e4 RK |
648 | pgoff_t index = 0, last = ULONG_MAX; |
649 | size_t ndirties = 0; | |
650 | int i; | |
9ff05123 | 651 | |
f30bf3e4 RK |
652 | if (unlikely(start != 0 || end != LLONG_MAX)) { |
653 | /* | |
654 | * A valid range is given for sync-ing data pages. The | |
655 | * range is rounded to per-page; extra dirty buffers | |
656 | * may be included if blocksize < pagesize. | |
657 | */ | |
658 | index = start >> PAGE_SHIFT; | |
659 | last = end >> PAGE_SHIFT; | |
660 | } | |
9ff05123 RK |
661 | pagevec_init(&pvec, 0); |
662 | repeat: | |
f30bf3e4 RK |
663 | if (unlikely(index > last) || |
664 | !pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY, | |
665 | min_t(pgoff_t, last - index, | |
666 | PAGEVEC_SIZE - 1) + 1)) | |
667 | return ndirties; | |
9ff05123 RK |
668 | |
669 | for (i = 0; i < pagevec_count(&pvec); i++) { | |
670 | struct buffer_head *bh, *head; | |
671 | struct page *page = pvec.pages[i]; | |
672 | ||
f30bf3e4 RK |
673 | if (unlikely(page->index > last)) |
674 | break; | |
675 | ||
9ff05123 RK |
676 | if (mapping->host) { |
677 | lock_page(page); | |
678 | if (!page_has_buffers(page)) | |
679 | create_empty_buffers(page, | |
680 | 1 << inode->i_blkbits, 0); | |
681 | unlock_page(page); | |
682 | } | |
683 | ||
684 | bh = head = page_buffers(page); | |
685 | do { | |
f30bf3e4 RK |
686 | if (!buffer_dirty(bh)) |
687 | continue; | |
688 | get_bh(bh); | |
689 | list_add_tail(&bh->b_assoc_buffers, listp); | |
690 | ndirties++; | |
691 | if (unlikely(ndirties >= nlimit)) { | |
692 | pagevec_release(&pvec); | |
693 | cond_resched(); | |
694 | return ndirties; | |
9ff05123 | 695 | } |
f30bf3e4 | 696 | } while (bh = bh->b_this_page, bh != head); |
9ff05123 RK |
697 | } |
698 | pagevec_release(&pvec); | |
699 | cond_resched(); | |
f30bf3e4 | 700 | goto repeat; |
9ff05123 RK |
701 | } |
702 | ||
703 | static void nilfs_lookup_dirty_node_buffers(struct inode *inode, | |
704 | struct list_head *listp) | |
705 | { | |
706 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
707 | struct address_space *mapping = &ii->i_btnode_cache; | |
708 | struct pagevec pvec; | |
709 | struct buffer_head *bh, *head; | |
710 | unsigned int i; | |
711 | pgoff_t index = 0; | |
712 | ||
713 | pagevec_init(&pvec, 0); | |
714 | ||
715 | while (pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY, | |
716 | PAGEVEC_SIZE)) { | |
717 | for (i = 0; i < pagevec_count(&pvec); i++) { | |
718 | bh = head = page_buffers(pvec.pages[i]); | |
719 | do { | |
720 | if (buffer_dirty(bh)) { | |
721 | get_bh(bh); | |
722 | list_add_tail(&bh->b_assoc_buffers, | |
723 | listp); | |
724 | } | |
725 | bh = bh->b_this_page; | |
726 | } while (bh != head); | |
727 | } | |
728 | pagevec_release(&pvec); | |
729 | cond_resched(); | |
730 | } | |
731 | } | |
732 | ||
733 | static void nilfs_dispose_list(struct nilfs_sb_info *sbi, | |
734 | struct list_head *head, int force) | |
735 | { | |
736 | struct nilfs_inode_info *ii, *n; | |
737 | struct nilfs_inode_info *ivec[SC_N_INODEVEC], **pii; | |
738 | unsigned nv = 0; | |
739 | ||
740 | while (!list_empty(head)) { | |
741 | spin_lock(&sbi->s_inode_lock); | |
742 | list_for_each_entry_safe(ii, n, head, i_dirty) { | |
743 | list_del_init(&ii->i_dirty); | |
744 | if (force) { | |
745 | if (unlikely(ii->i_bh)) { | |
746 | brelse(ii->i_bh); | |
747 | ii->i_bh = NULL; | |
748 | } | |
749 | } else if (test_bit(NILFS_I_DIRTY, &ii->i_state)) { | |
750 | set_bit(NILFS_I_QUEUED, &ii->i_state); | |
751 | list_add_tail(&ii->i_dirty, | |
752 | &sbi->s_dirty_files); | |
753 | continue; | |
754 | } | |
755 | ivec[nv++] = ii; | |
756 | if (nv == SC_N_INODEVEC) | |
757 | break; | |
758 | } | |
759 | spin_unlock(&sbi->s_inode_lock); | |
760 | ||
761 | for (pii = ivec; nv > 0; pii++, nv--) | |
762 | iput(&(*pii)->vfs_inode); | |
763 | } | |
764 | } | |
765 | ||
e912a5b6 RK |
766 | static int nilfs_test_metadata_dirty(struct the_nilfs *nilfs, |
767 | struct nilfs_root *root) | |
9ff05123 | 768 | { |
9ff05123 RK |
769 | int ret = 0; |
770 | ||
e912a5b6 | 771 | if (nilfs_mdt_fetch_dirty(root->ifile)) |
9ff05123 RK |
772 | ret++; |
773 | if (nilfs_mdt_fetch_dirty(nilfs->ns_cpfile)) | |
774 | ret++; | |
775 | if (nilfs_mdt_fetch_dirty(nilfs->ns_sufile)) | |
776 | ret++; | |
777 | if (ret || nilfs_doing_gc()) | |
778 | if (nilfs_mdt_fetch_dirty(nilfs_dat_inode(nilfs))) | |
779 | ret++; | |
780 | return ret; | |
781 | } | |
782 | ||
783 | static int nilfs_segctor_clean(struct nilfs_sc_info *sci) | |
784 | { | |
785 | return list_empty(&sci->sc_dirty_files) && | |
786 | !test_bit(NILFS_SC_DIRTY, &sci->sc_flags) && | |
071cb4b8 | 787 | sci->sc_nfreesegs == 0 && |
9ff05123 RK |
788 | (!nilfs_doing_gc() || list_empty(&sci->sc_gc_inodes)); |
789 | } | |
790 | ||
791 | static int nilfs_segctor_confirm(struct nilfs_sc_info *sci) | |
792 | { | |
793 | struct nilfs_sb_info *sbi = sci->sc_sbi; | |
794 | int ret = 0; | |
795 | ||
e912a5b6 | 796 | if (nilfs_test_metadata_dirty(sbi->s_nilfs, sci->sc_root)) |
9ff05123 RK |
797 | set_bit(NILFS_SC_DIRTY, &sci->sc_flags); |
798 | ||
799 | spin_lock(&sbi->s_inode_lock); | |
800 | if (list_empty(&sbi->s_dirty_files) && nilfs_segctor_clean(sci)) | |
801 | ret++; | |
802 | ||
803 | spin_unlock(&sbi->s_inode_lock); | |
804 | return ret; | |
805 | } | |
806 | ||
807 | static void nilfs_segctor_clear_metadata_dirty(struct nilfs_sc_info *sci) | |
808 | { | |
809 | struct nilfs_sb_info *sbi = sci->sc_sbi; | |
810 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
811 | ||
e912a5b6 | 812 | nilfs_mdt_clear_dirty(sci->sc_root->ifile); |
9ff05123 RK |
813 | nilfs_mdt_clear_dirty(nilfs->ns_cpfile); |
814 | nilfs_mdt_clear_dirty(nilfs->ns_sufile); | |
815 | nilfs_mdt_clear_dirty(nilfs_dat_inode(nilfs)); | |
816 | } | |
817 | ||
818 | static int nilfs_segctor_create_checkpoint(struct nilfs_sc_info *sci) | |
819 | { | |
820 | struct the_nilfs *nilfs = sci->sc_sbi->s_nilfs; | |
821 | struct buffer_head *bh_cp; | |
822 | struct nilfs_checkpoint *raw_cp; | |
823 | int err; | |
824 | ||
825 | /* XXX: this interface will be changed */ | |
826 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 1, | |
827 | &raw_cp, &bh_cp); | |
828 | if (likely(!err)) { | |
829 | /* The following code is duplicated with cpfile. But, it is | |
830 | needed to collect the checkpoint even if it was not newly | |
831 | created */ | |
832 | nilfs_mdt_mark_buffer_dirty(bh_cp); | |
833 | nilfs_mdt_mark_dirty(nilfs->ns_cpfile); | |
834 | nilfs_cpfile_put_checkpoint( | |
835 | nilfs->ns_cpfile, nilfs->ns_cno, bh_cp); | |
1f5abe7e RK |
836 | } else |
837 | WARN_ON(err == -EINVAL || err == -ENOENT); | |
838 | ||
9ff05123 RK |
839 | return err; |
840 | } | |
841 | ||
842 | static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci) | |
843 | { | |
844 | struct nilfs_sb_info *sbi = sci->sc_sbi; | |
845 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
846 | struct buffer_head *bh_cp; | |
847 | struct nilfs_checkpoint *raw_cp; | |
848 | int err; | |
849 | ||
850 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 0, | |
851 | &raw_cp, &bh_cp); | |
852 | if (unlikely(err)) { | |
1f5abe7e | 853 | WARN_ON(err == -EINVAL || err == -ENOENT); |
9ff05123 RK |
854 | goto failed_ibh; |
855 | } | |
856 | raw_cp->cp_snapshot_list.ssl_next = 0; | |
857 | raw_cp->cp_snapshot_list.ssl_prev = 0; | |
858 | raw_cp->cp_inodes_count = | |
b7c06342 | 859 | cpu_to_le64(atomic_read(&sci->sc_root->inodes_count)); |
9ff05123 | 860 | raw_cp->cp_blocks_count = |
b7c06342 | 861 | cpu_to_le64(atomic_read(&sci->sc_root->blocks_count)); |
9ff05123 RK |
862 | raw_cp->cp_nblk_inc = |
863 | cpu_to_le64(sci->sc_nblk_inc + sci->sc_nblk_this_inc); | |
864 | raw_cp->cp_create = cpu_to_le64(sci->sc_seg_ctime); | |
865 | raw_cp->cp_cno = cpu_to_le64(nilfs->ns_cno); | |
458c5b08 | 866 | |
c96fa464 RK |
867 | if (test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags)) |
868 | nilfs_checkpoint_clear_minor(raw_cp); | |
869 | else | |
870 | nilfs_checkpoint_set_minor(raw_cp); | |
871 | ||
e912a5b6 RK |
872 | nilfs_write_inode_common(sci->sc_root->ifile, |
873 | &raw_cp->cp_ifile_inode, 1); | |
9ff05123 RK |
874 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, bh_cp); |
875 | return 0; | |
876 | ||
877 | failed_ibh: | |
878 | return err; | |
879 | } | |
880 | ||
881 | static void nilfs_fill_in_file_bmap(struct inode *ifile, | |
882 | struct nilfs_inode_info *ii) | |
883 | ||
884 | { | |
885 | struct buffer_head *ibh; | |
886 | struct nilfs_inode *raw_inode; | |
887 | ||
888 | if (test_bit(NILFS_I_BMAP, &ii->i_state)) { | |
889 | ibh = ii->i_bh; | |
890 | BUG_ON(!ibh); | |
891 | raw_inode = nilfs_ifile_map_inode(ifile, ii->vfs_inode.i_ino, | |
892 | ibh); | |
893 | nilfs_bmap_write(ii->i_bmap, raw_inode); | |
894 | nilfs_ifile_unmap_inode(ifile, ii->vfs_inode.i_ino, ibh); | |
895 | } | |
896 | } | |
897 | ||
e912a5b6 | 898 | static void nilfs_segctor_fill_in_file_bmap(struct nilfs_sc_info *sci) |
9ff05123 RK |
899 | { |
900 | struct nilfs_inode_info *ii; | |
901 | ||
902 | list_for_each_entry(ii, &sci->sc_dirty_files, i_dirty) { | |
e912a5b6 | 903 | nilfs_fill_in_file_bmap(sci->sc_root->ifile, ii); |
9ff05123 RK |
904 | set_bit(NILFS_I_COLLECTED, &ii->i_state); |
905 | } | |
9ff05123 RK |
906 | } |
907 | ||
9ff05123 RK |
908 | static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info *sci, |
909 | struct the_nilfs *nilfs) | |
910 | { | |
1e2b68bf RK |
911 | struct buffer_head *bh_sr; |
912 | struct nilfs_super_root *raw_sr; | |
9ff05123 RK |
913 | unsigned isz = nilfs->ns_inode_size; |
914 | ||
1e2b68bf RK |
915 | bh_sr = NILFS_LAST_SEGBUF(&sci->sc_segbufs)->sb_super_root; |
916 | raw_sr = (struct nilfs_super_root *)bh_sr->b_data; | |
917 | ||
9ff05123 RK |
918 | raw_sr->sr_bytes = cpu_to_le16(NILFS_SR_BYTES); |
919 | raw_sr->sr_nongc_ctime | |
920 | = cpu_to_le64(nilfs_doing_gc() ? | |
921 | nilfs->ns_nongc_ctime : sci->sc_seg_ctime); | |
922 | raw_sr->sr_flags = 0; | |
923 | ||
3961f0e2 RK |
924 | nilfs_write_inode_common(nilfs_dat_inode(nilfs), (void *)raw_sr + |
925 | NILFS_SR_DAT_OFFSET(isz), 1); | |
926 | nilfs_write_inode_common(nilfs->ns_cpfile, (void *)raw_sr + | |
927 | NILFS_SR_CPFILE_OFFSET(isz), 1); | |
928 | nilfs_write_inode_common(nilfs->ns_sufile, (void *)raw_sr + | |
929 | NILFS_SR_SUFILE_OFFSET(isz), 1); | |
9ff05123 RK |
930 | } |
931 | ||
932 | static void nilfs_redirty_inodes(struct list_head *head) | |
933 | { | |
934 | struct nilfs_inode_info *ii; | |
935 | ||
936 | list_for_each_entry(ii, head, i_dirty) { | |
937 | if (test_bit(NILFS_I_COLLECTED, &ii->i_state)) | |
938 | clear_bit(NILFS_I_COLLECTED, &ii->i_state); | |
939 | } | |
940 | } | |
941 | ||
942 | static void nilfs_drop_collected_inodes(struct list_head *head) | |
943 | { | |
944 | struct nilfs_inode_info *ii; | |
945 | ||
946 | list_for_each_entry(ii, head, i_dirty) { | |
947 | if (!test_and_clear_bit(NILFS_I_COLLECTED, &ii->i_state)) | |
948 | continue; | |
949 | ||
950 | clear_bit(NILFS_I_INODE_DIRTY, &ii->i_state); | |
951 | set_bit(NILFS_I_UPDATED, &ii->i_state); | |
952 | } | |
953 | } | |
954 | ||
9ff05123 RK |
955 | static int nilfs_segctor_apply_buffers(struct nilfs_sc_info *sci, |
956 | struct inode *inode, | |
957 | struct list_head *listp, | |
958 | int (*collect)(struct nilfs_sc_info *, | |
959 | struct buffer_head *, | |
960 | struct inode *)) | |
961 | { | |
962 | struct buffer_head *bh, *n; | |
963 | int err = 0; | |
964 | ||
965 | if (collect) { | |
966 | list_for_each_entry_safe(bh, n, listp, b_assoc_buffers) { | |
967 | list_del_init(&bh->b_assoc_buffers); | |
968 | err = collect(sci, bh, inode); | |
969 | brelse(bh); | |
970 | if (unlikely(err)) | |
971 | goto dispose_buffers; | |
972 | } | |
973 | return 0; | |
974 | } | |
975 | ||
976 | dispose_buffers: | |
977 | while (!list_empty(listp)) { | |
978 | bh = list_entry(listp->next, struct buffer_head, | |
979 | b_assoc_buffers); | |
980 | list_del_init(&bh->b_assoc_buffers); | |
981 | brelse(bh); | |
982 | } | |
983 | return err; | |
984 | } | |
985 | ||
f30bf3e4 RK |
986 | static size_t nilfs_segctor_buffer_rest(struct nilfs_sc_info *sci) |
987 | { | |
988 | /* Remaining number of blocks within segment buffer */ | |
989 | return sci->sc_segbuf_nblocks - | |
990 | (sci->sc_nblk_this_inc + sci->sc_curseg->sb_sum.nblocks); | |
991 | } | |
992 | ||
9ff05123 RK |
993 | static int nilfs_segctor_scan_file(struct nilfs_sc_info *sci, |
994 | struct inode *inode, | |
995 | struct nilfs_sc_operations *sc_ops) | |
996 | { | |
997 | LIST_HEAD(data_buffers); | |
998 | LIST_HEAD(node_buffers); | |
f30bf3e4 | 999 | int err; |
9ff05123 RK |
1000 | |
1001 | if (!(sci->sc_stage.flags & NILFS_CF_NODE)) { | |
f30bf3e4 RK |
1002 | size_t n, rest = nilfs_segctor_buffer_rest(sci); |
1003 | ||
1004 | n = nilfs_lookup_dirty_data_buffers( | |
1005 | inode, &data_buffers, rest + 1, 0, LLONG_MAX); | |
1006 | if (n > rest) { | |
1007 | err = nilfs_segctor_apply_buffers( | |
9ff05123 | 1008 | sci, inode, &data_buffers, |
f30bf3e4 RK |
1009 | sc_ops->collect_data); |
1010 | BUG_ON(!err); /* always receive -E2BIG or true error */ | |
9ff05123 RK |
1011 | goto break_or_fail; |
1012 | } | |
1013 | } | |
1014 | nilfs_lookup_dirty_node_buffers(inode, &node_buffers); | |
1015 | ||
1016 | if (!(sci->sc_stage.flags & NILFS_CF_NODE)) { | |
1017 | err = nilfs_segctor_apply_buffers( | |
1018 | sci, inode, &data_buffers, sc_ops->collect_data); | |
1019 | if (unlikely(err)) { | |
1020 | /* dispose node list */ | |
1021 | nilfs_segctor_apply_buffers( | |
1022 | sci, inode, &node_buffers, NULL); | |
1023 | goto break_or_fail; | |
1024 | } | |
1025 | sci->sc_stage.flags |= NILFS_CF_NODE; | |
1026 | } | |
1027 | /* Collect node */ | |
1028 | err = nilfs_segctor_apply_buffers( | |
1029 | sci, inode, &node_buffers, sc_ops->collect_node); | |
1030 | if (unlikely(err)) | |
1031 | goto break_or_fail; | |
1032 | ||
1033 | nilfs_bmap_lookup_dirty_buffers(NILFS_I(inode)->i_bmap, &node_buffers); | |
1034 | err = nilfs_segctor_apply_buffers( | |
1035 | sci, inode, &node_buffers, sc_ops->collect_bmap); | |
1036 | if (unlikely(err)) | |
1037 | goto break_or_fail; | |
1038 | ||
1039 | nilfs_segctor_end_finfo(sci, inode); | |
1040 | sci->sc_stage.flags &= ~NILFS_CF_NODE; | |
1041 | ||
1042 | break_or_fail: | |
1043 | return err; | |
1044 | } | |
1045 | ||
1046 | static int nilfs_segctor_scan_file_dsync(struct nilfs_sc_info *sci, | |
1047 | struct inode *inode) | |
1048 | { | |
1049 | LIST_HEAD(data_buffers); | |
f30bf3e4 RK |
1050 | size_t n, rest = nilfs_segctor_buffer_rest(sci); |
1051 | int err; | |
9ff05123 | 1052 | |
f30bf3e4 RK |
1053 | n = nilfs_lookup_dirty_data_buffers(inode, &data_buffers, rest + 1, |
1054 | sci->sc_dsync_start, | |
1055 | sci->sc_dsync_end); | |
1056 | ||
1057 | err = nilfs_segctor_apply_buffers(sci, inode, &data_buffers, | |
1058 | nilfs_collect_file_data); | |
1059 | if (!err) { | |
9ff05123 | 1060 | nilfs_segctor_end_finfo(sci, inode); |
f30bf3e4 RK |
1061 | BUG_ON(n > rest); |
1062 | /* always receive -E2BIG or true error if n > rest */ | |
1063 | } | |
9ff05123 RK |
1064 | return err; |
1065 | } | |
1066 | ||
1067 | static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode) | |
1068 | { | |
1069 | struct nilfs_sb_info *sbi = sci->sc_sbi; | |
1070 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
1071 | struct list_head *head; | |
1072 | struct nilfs_inode_info *ii; | |
071cb4b8 | 1073 | size_t ndone; |
9ff05123 RK |
1074 | int err = 0; |
1075 | ||
1076 | switch (sci->sc_stage.scnt) { | |
1077 | case NILFS_ST_INIT: | |
1078 | /* Pre-processes */ | |
1079 | sci->sc_stage.flags = 0; | |
1080 | ||
1081 | if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) { | |
1082 | sci->sc_nblk_inc = 0; | |
1083 | sci->sc_curseg->sb_sum.flags = NILFS_SS_LOGBGN; | |
1084 | if (mode == SC_LSEG_DSYNC) { | |
1085 | sci->sc_stage.scnt = NILFS_ST_DSYNC; | |
1086 | goto dsync_mode; | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | sci->sc_stage.dirty_file_ptr = NULL; | |
1091 | sci->sc_stage.gc_inode_ptr = NULL; | |
1092 | if (mode == SC_FLUSH_DAT) { | |
1093 | sci->sc_stage.scnt = NILFS_ST_DAT; | |
1094 | goto dat_stage; | |
1095 | } | |
1096 | sci->sc_stage.scnt++; /* Fall through */ | |
1097 | case NILFS_ST_GC: | |
1098 | if (nilfs_doing_gc()) { | |
1099 | head = &sci->sc_gc_inodes; | |
1100 | ii = list_prepare_entry(sci->sc_stage.gc_inode_ptr, | |
1101 | head, i_dirty); | |
1102 | list_for_each_entry_continue(ii, head, i_dirty) { | |
1103 | err = nilfs_segctor_scan_file( | |
1104 | sci, &ii->vfs_inode, | |
1105 | &nilfs_sc_file_ops); | |
1106 | if (unlikely(err)) { | |
1107 | sci->sc_stage.gc_inode_ptr = list_entry( | |
1108 | ii->i_dirty.prev, | |
1109 | struct nilfs_inode_info, | |
1110 | i_dirty); | |
1111 | goto break_or_fail; | |
1112 | } | |
1113 | set_bit(NILFS_I_COLLECTED, &ii->i_state); | |
1114 | } | |
1115 | sci->sc_stage.gc_inode_ptr = NULL; | |
1116 | } | |
1117 | sci->sc_stage.scnt++; /* Fall through */ | |
1118 | case NILFS_ST_FILE: | |
1119 | head = &sci->sc_dirty_files; | |
1120 | ii = list_prepare_entry(sci->sc_stage.dirty_file_ptr, head, | |
1121 | i_dirty); | |
1122 | list_for_each_entry_continue(ii, head, i_dirty) { | |
1123 | clear_bit(NILFS_I_DIRTY, &ii->i_state); | |
1124 | ||
1125 | err = nilfs_segctor_scan_file(sci, &ii->vfs_inode, | |
1126 | &nilfs_sc_file_ops); | |
1127 | if (unlikely(err)) { | |
1128 | sci->sc_stage.dirty_file_ptr = | |
1129 | list_entry(ii->i_dirty.prev, | |
1130 | struct nilfs_inode_info, | |
1131 | i_dirty); | |
1132 | goto break_or_fail; | |
1133 | } | |
1134 | /* sci->sc_stage.dirty_file_ptr = NILFS_I(inode); */ | |
1135 | /* XXX: required ? */ | |
1136 | } | |
1137 | sci->sc_stage.dirty_file_ptr = NULL; | |
1138 | if (mode == SC_FLUSH_FILE) { | |
1139 | sci->sc_stage.scnt = NILFS_ST_DONE; | |
1140 | return 0; | |
1141 | } | |
9ff05123 RK |
1142 | sci->sc_stage.scnt++; |
1143 | sci->sc_stage.flags |= NILFS_CF_IFILE_STARTED; | |
1144 | /* Fall through */ | |
1145 | case NILFS_ST_IFILE: | |
e912a5b6 | 1146 | err = nilfs_segctor_scan_file(sci, sci->sc_root->ifile, |
9ff05123 RK |
1147 | &nilfs_sc_file_ops); |
1148 | if (unlikely(err)) | |
1149 | break; | |
1150 | sci->sc_stage.scnt++; | |
1151 | /* Creating a checkpoint */ | |
1152 | err = nilfs_segctor_create_checkpoint(sci); | |
1153 | if (unlikely(err)) | |
1154 | break; | |
1155 | /* Fall through */ | |
1156 | case NILFS_ST_CPFILE: | |
1157 | err = nilfs_segctor_scan_file(sci, nilfs->ns_cpfile, | |
1158 | &nilfs_sc_file_ops); | |
1159 | if (unlikely(err)) | |
1160 | break; | |
1161 | sci->sc_stage.scnt++; /* Fall through */ | |
1162 | case NILFS_ST_SUFILE: | |
071cb4b8 RK |
1163 | err = nilfs_sufile_freev(nilfs->ns_sufile, sci->sc_freesegs, |
1164 | sci->sc_nfreesegs, &ndone); | |
1165 | if (unlikely(err)) { | |
1166 | nilfs_sufile_cancel_freev(nilfs->ns_sufile, | |
1167 | sci->sc_freesegs, ndone, | |
1168 | NULL); | |
9ff05123 | 1169 | break; |
071cb4b8 RK |
1170 | } |
1171 | sci->sc_stage.flags |= NILFS_CF_SUFREED; | |
1172 | ||
9ff05123 RK |
1173 | err = nilfs_segctor_scan_file(sci, nilfs->ns_sufile, |
1174 | &nilfs_sc_file_ops); | |
1175 | if (unlikely(err)) | |
1176 | break; | |
1177 | sci->sc_stage.scnt++; /* Fall through */ | |
1178 | case NILFS_ST_DAT: | |
1179 | dat_stage: | |
1180 | err = nilfs_segctor_scan_file(sci, nilfs_dat_inode(nilfs), | |
1181 | &nilfs_sc_dat_ops); | |
1182 | if (unlikely(err)) | |
1183 | break; | |
1184 | if (mode == SC_FLUSH_DAT) { | |
1185 | sci->sc_stage.scnt = NILFS_ST_DONE; | |
1186 | return 0; | |
1187 | } | |
1188 | sci->sc_stage.scnt++; /* Fall through */ | |
1189 | case NILFS_ST_SR: | |
1190 | if (mode == SC_LSEG_SR) { | |
1191 | /* Appending a super root */ | |
1192 | err = nilfs_segctor_add_super_root(sci); | |
1193 | if (unlikely(err)) | |
1194 | break; | |
1195 | } | |
1196 | /* End of a logical segment */ | |
1197 | sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND; | |
1198 | sci->sc_stage.scnt = NILFS_ST_DONE; | |
1199 | return 0; | |
1200 | case NILFS_ST_DSYNC: | |
1201 | dsync_mode: | |
1202 | sci->sc_curseg->sb_sum.flags |= NILFS_SS_SYNDT; | |
f30bf3e4 | 1203 | ii = sci->sc_dsync_inode; |
9ff05123 RK |
1204 | if (!test_bit(NILFS_I_BUSY, &ii->i_state)) |
1205 | break; | |
1206 | ||
1207 | err = nilfs_segctor_scan_file_dsync(sci, &ii->vfs_inode); | |
1208 | if (unlikely(err)) | |
1209 | break; | |
9ff05123 RK |
1210 | sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND; |
1211 | sci->sc_stage.scnt = NILFS_ST_DONE; | |
1212 | return 0; | |
1213 | case NILFS_ST_DONE: | |
1214 | return 0; | |
1215 | default: | |
1216 | BUG(); | |
1217 | } | |
1218 | ||
1219 | break_or_fail: | |
1220 | return err; | |
1221 | } | |
1222 | ||
a694291a RK |
1223 | /** |
1224 | * nilfs_segctor_begin_construction - setup segment buffer to make a new log | |
1225 | * @sci: nilfs_sc_info | |
1226 | * @nilfs: nilfs object | |
1227 | */ | |
9ff05123 RK |
1228 | static int nilfs_segctor_begin_construction(struct nilfs_sc_info *sci, |
1229 | struct the_nilfs *nilfs) | |
1230 | { | |
a694291a | 1231 | struct nilfs_segment_buffer *segbuf, *prev; |
9ff05123 | 1232 | __u64 nextnum; |
a694291a | 1233 | int err, alloc = 0; |
9ff05123 | 1234 | |
a694291a RK |
1235 | segbuf = nilfs_segbuf_new(sci->sc_super); |
1236 | if (unlikely(!segbuf)) | |
1237 | return -ENOMEM; | |
9ff05123 | 1238 | |
a694291a RK |
1239 | if (list_empty(&sci->sc_write_logs)) { |
1240 | nilfs_segbuf_map(segbuf, nilfs->ns_segnum, | |
1241 | nilfs->ns_pseg_offset, nilfs); | |
1242 | if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) { | |
1243 | nilfs_shift_to_next_segment(nilfs); | |
1244 | nilfs_segbuf_map(segbuf, nilfs->ns_segnum, 0, nilfs); | |
1245 | } | |
9ff05123 | 1246 | |
a694291a RK |
1247 | segbuf->sb_sum.seg_seq = nilfs->ns_seg_seq; |
1248 | nextnum = nilfs->ns_nextnum; | |
1249 | ||
1250 | if (nilfs->ns_segnum == nilfs->ns_nextnum) | |
1251 | /* Start from the head of a new full segment */ | |
1252 | alloc++; | |
1253 | } else { | |
1254 | /* Continue logs */ | |
1255 | prev = NILFS_LAST_SEGBUF(&sci->sc_write_logs); | |
1256 | nilfs_segbuf_map_cont(segbuf, prev); | |
1257 | segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq; | |
1258 | nextnum = prev->sb_nextnum; | |
1259 | ||
1260 | if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) { | |
1261 | nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs); | |
1262 | segbuf->sb_sum.seg_seq++; | |
1263 | alloc++; | |
1264 | } | |
9ff05123 | 1265 | } |
9ff05123 | 1266 | |
61a189e9 | 1267 | err = nilfs_sufile_mark_dirty(nilfs->ns_sufile, segbuf->sb_segnum); |
a694291a RK |
1268 | if (err) |
1269 | goto failed; | |
9ff05123 | 1270 | |
a694291a | 1271 | if (alloc) { |
cece5520 | 1272 | err = nilfs_sufile_alloc(nilfs->ns_sufile, &nextnum); |
a694291a RK |
1273 | if (err) |
1274 | goto failed; | |
1275 | } | |
9ff05123 RK |
1276 | nilfs_segbuf_set_next_segnum(segbuf, nextnum, nilfs); |
1277 | ||
a694291a RK |
1278 | BUG_ON(!list_empty(&sci->sc_segbufs)); |
1279 | list_add_tail(&segbuf->sb_list, &sci->sc_segbufs); | |
1280 | sci->sc_segbuf_nblocks = segbuf->sb_rest_blocks; | |
cece5520 | 1281 | return 0; |
a694291a RK |
1282 | |
1283 | failed: | |
1284 | nilfs_segbuf_free(segbuf); | |
1285 | return err; | |
9ff05123 RK |
1286 | } |
1287 | ||
1288 | static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci, | |
1289 | struct the_nilfs *nilfs, int nadd) | |
1290 | { | |
e29df395 | 1291 | struct nilfs_segment_buffer *segbuf, *prev; |
9ff05123 RK |
1292 | struct inode *sufile = nilfs->ns_sufile; |
1293 | __u64 nextnextnum; | |
1294 | LIST_HEAD(list); | |
1295 | int err, ret, i; | |
1296 | ||
1297 | prev = NILFS_LAST_SEGBUF(&sci->sc_segbufs); | |
1298 | /* | |
1299 | * Since the segment specified with nextnum might be allocated during | |
1300 | * the previous construction, the buffer including its segusage may | |
1301 | * not be dirty. The following call ensures that the buffer is dirty | |
1302 | * and will pin the buffer on memory until the sufile is written. | |
1303 | */ | |
61a189e9 | 1304 | err = nilfs_sufile_mark_dirty(sufile, prev->sb_nextnum); |
9ff05123 RK |
1305 | if (unlikely(err)) |
1306 | return err; | |
1307 | ||
1308 | for (i = 0; i < nadd; i++) { | |
1309 | /* extend segment info */ | |
1310 | err = -ENOMEM; | |
1311 | segbuf = nilfs_segbuf_new(sci->sc_super); | |
1312 | if (unlikely(!segbuf)) | |
1313 | goto failed; | |
1314 | ||
1315 | /* map this buffer to region of segment on-disk */ | |
cece5520 | 1316 | nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs); |
9ff05123 RK |
1317 | sci->sc_segbuf_nblocks += segbuf->sb_rest_blocks; |
1318 | ||
1319 | /* allocate the next next full segment */ | |
1320 | err = nilfs_sufile_alloc(sufile, &nextnextnum); | |
1321 | if (unlikely(err)) | |
1322 | goto failed_segbuf; | |
1323 | ||
1324 | segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq + 1; | |
1325 | nilfs_segbuf_set_next_segnum(segbuf, nextnextnum, nilfs); | |
1326 | ||
1327 | list_add_tail(&segbuf->sb_list, &list); | |
1328 | prev = segbuf; | |
1329 | } | |
0935db74 | 1330 | list_splice_tail(&list, &sci->sc_segbufs); |
9ff05123 RK |
1331 | return 0; |
1332 | ||
1333 | failed_segbuf: | |
1334 | nilfs_segbuf_free(segbuf); | |
1335 | failed: | |
e29df395 | 1336 | list_for_each_entry(segbuf, &list, sb_list) { |
9ff05123 | 1337 | ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); |
1f5abe7e | 1338 | WARN_ON(ret); /* never fails */ |
9ff05123 | 1339 | } |
e29df395 | 1340 | nilfs_destroy_logs(&list); |
9ff05123 RK |
1341 | return err; |
1342 | } | |
1343 | ||
a694291a RK |
1344 | static void nilfs_free_incomplete_logs(struct list_head *logs, |
1345 | struct the_nilfs *nilfs) | |
9ff05123 | 1346 | { |
a694291a RK |
1347 | struct nilfs_segment_buffer *segbuf, *prev; |
1348 | struct inode *sufile = nilfs->ns_sufile; | |
9284ad2a | 1349 | int ret; |
9ff05123 | 1350 | |
a694291a | 1351 | segbuf = NILFS_FIRST_SEGBUF(logs); |
9ff05123 | 1352 | if (nilfs->ns_nextnum != segbuf->sb_nextnum) { |
a694291a | 1353 | ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); |
1f5abe7e | 1354 | WARN_ON(ret); /* never fails */ |
9ff05123 | 1355 | } |
9284ad2a | 1356 | if (atomic_read(&segbuf->sb_err)) { |
9ff05123 RK |
1357 | /* Case 1: The first segment failed */ |
1358 | if (segbuf->sb_pseg_start != segbuf->sb_fseg_start) | |
1359 | /* Case 1a: Partial segment appended into an existing | |
1360 | segment */ | |
1361 | nilfs_terminate_segment(nilfs, segbuf->sb_fseg_start, | |
1362 | segbuf->sb_fseg_end); | |
1363 | else /* Case 1b: New full segment */ | |
1364 | set_nilfs_discontinued(nilfs); | |
9ff05123 RK |
1365 | } |
1366 | ||
a694291a RK |
1367 | prev = segbuf; |
1368 | list_for_each_entry_continue(segbuf, logs, sb_list) { | |
1369 | if (prev->sb_nextnum != segbuf->sb_nextnum) { | |
1370 | ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); | |
1371 | WARN_ON(ret); /* never fails */ | |
1372 | } | |
9284ad2a RK |
1373 | if (atomic_read(&segbuf->sb_err) && |
1374 | segbuf->sb_segnum != nilfs->ns_nextnum) | |
1375 | /* Case 2: extended segment (!= next) failed */ | |
a694291a RK |
1376 | nilfs_sufile_set_error(sufile, segbuf->sb_segnum); |
1377 | prev = segbuf; | |
9ff05123 | 1378 | } |
9ff05123 RK |
1379 | } |
1380 | ||
1381 | static void nilfs_segctor_update_segusage(struct nilfs_sc_info *sci, | |
1382 | struct inode *sufile) | |
1383 | { | |
1384 | struct nilfs_segment_buffer *segbuf; | |
9ff05123 RK |
1385 | unsigned long live_blocks; |
1386 | int ret; | |
1387 | ||
1388 | list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) { | |
9ff05123 RK |
1389 | live_blocks = segbuf->sb_sum.nblocks + |
1390 | (segbuf->sb_pseg_start - segbuf->sb_fseg_start); | |
071ec54d RK |
1391 | ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum, |
1392 | live_blocks, | |
1393 | sci->sc_seg_ctime); | |
1394 | WARN_ON(ret); /* always succeed because the segusage is dirty */ | |
9ff05123 RK |
1395 | } |
1396 | } | |
1397 | ||
a694291a | 1398 | static void nilfs_cancel_segusage(struct list_head *logs, struct inode *sufile) |
9ff05123 RK |
1399 | { |
1400 | struct nilfs_segment_buffer *segbuf; | |
9ff05123 RK |
1401 | int ret; |
1402 | ||
a694291a | 1403 | segbuf = NILFS_FIRST_SEGBUF(logs); |
071ec54d RK |
1404 | ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum, |
1405 | segbuf->sb_pseg_start - | |
1406 | segbuf->sb_fseg_start, 0); | |
1407 | WARN_ON(ret); /* always succeed because the segusage is dirty */ | |
9ff05123 | 1408 | |
a694291a | 1409 | list_for_each_entry_continue(segbuf, logs, sb_list) { |
071ec54d RK |
1410 | ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum, |
1411 | 0, 0); | |
1f5abe7e | 1412 | WARN_ON(ret); /* always succeed */ |
9ff05123 RK |
1413 | } |
1414 | } | |
1415 | ||
1416 | static void nilfs_segctor_truncate_segments(struct nilfs_sc_info *sci, | |
1417 | struct nilfs_segment_buffer *last, | |
1418 | struct inode *sufile) | |
1419 | { | |
e29df395 | 1420 | struct nilfs_segment_buffer *segbuf = last; |
9ff05123 RK |
1421 | int ret; |
1422 | ||
e29df395 | 1423 | list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) { |
9ff05123 RK |
1424 | sci->sc_segbuf_nblocks -= segbuf->sb_rest_blocks; |
1425 | ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); | |
1f5abe7e | 1426 | WARN_ON(ret); |
9ff05123 | 1427 | } |
e29df395 | 1428 | nilfs_truncate_logs(&sci->sc_segbufs, last); |
9ff05123 RK |
1429 | } |
1430 | ||
1431 | ||
1432 | static int nilfs_segctor_collect(struct nilfs_sc_info *sci, | |
1433 | struct the_nilfs *nilfs, int mode) | |
1434 | { | |
1435 | struct nilfs_cstage prev_stage = sci->sc_stage; | |
1436 | int err, nadd = 1; | |
1437 | ||
1438 | /* Collection retry loop */ | |
1439 | for (;;) { | |
9ff05123 RK |
1440 | sci->sc_nblk_this_inc = 0; |
1441 | sci->sc_curseg = NILFS_FIRST_SEGBUF(&sci->sc_segbufs); | |
1442 | ||
1443 | err = nilfs_segctor_reset_segment_buffer(sci); | |
1444 | if (unlikely(err)) | |
1445 | goto failed; | |
1446 | ||
1447 | err = nilfs_segctor_collect_blocks(sci, mode); | |
1448 | sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks; | |
1449 | if (!err) | |
1450 | break; | |
1451 | ||
1452 | if (unlikely(err != -E2BIG)) | |
1453 | goto failed; | |
1454 | ||
1455 | /* The current segment is filled up */ | |
1456 | if (mode != SC_LSEG_SR || sci->sc_stage.scnt < NILFS_ST_CPFILE) | |
1457 | break; | |
1458 | ||
2d8428ac RK |
1459 | nilfs_clear_logs(&sci->sc_segbufs); |
1460 | ||
1461 | err = nilfs_segctor_extend_segments(sci, nilfs, nadd); | |
1462 | if (unlikely(err)) | |
1463 | return err; | |
1464 | ||
071cb4b8 RK |
1465 | if (sci->sc_stage.flags & NILFS_CF_SUFREED) { |
1466 | err = nilfs_sufile_cancel_freev(nilfs->ns_sufile, | |
1467 | sci->sc_freesegs, | |
1468 | sci->sc_nfreesegs, | |
1469 | NULL); | |
1470 | WARN_ON(err); /* do not happen */ | |
1471 | } | |
9ff05123 RK |
1472 | nadd = min_t(int, nadd << 1, SC_MAX_SEGDELTA); |
1473 | sci->sc_stage = prev_stage; | |
1474 | } | |
1475 | nilfs_segctor_truncate_segments(sci, sci->sc_curseg, nilfs->ns_sufile); | |
1476 | return 0; | |
1477 | ||
1478 | failed: | |
1479 | return err; | |
1480 | } | |
1481 | ||
1482 | static void nilfs_list_replace_buffer(struct buffer_head *old_bh, | |
1483 | struct buffer_head *new_bh) | |
1484 | { | |
1485 | BUG_ON(!list_empty(&new_bh->b_assoc_buffers)); | |
1486 | ||
1487 | list_replace_init(&old_bh->b_assoc_buffers, &new_bh->b_assoc_buffers); | |
1488 | /* The caller must release old_bh */ | |
1489 | } | |
1490 | ||
1491 | static int | |
1492 | nilfs_segctor_update_payload_blocknr(struct nilfs_sc_info *sci, | |
1493 | struct nilfs_segment_buffer *segbuf, | |
1494 | int mode) | |
1495 | { | |
1496 | struct inode *inode = NULL; | |
1497 | sector_t blocknr; | |
1498 | unsigned long nfinfo = segbuf->sb_sum.nfinfo; | |
1499 | unsigned long nblocks = 0, ndatablk = 0; | |
1500 | struct nilfs_sc_operations *sc_op = NULL; | |
1501 | struct nilfs_segsum_pointer ssp; | |
1502 | struct nilfs_finfo *finfo = NULL; | |
1503 | union nilfs_binfo binfo; | |
1504 | struct buffer_head *bh, *bh_org; | |
1505 | ino_t ino = 0; | |
1506 | int err = 0; | |
1507 | ||
1508 | if (!nfinfo) | |
1509 | goto out; | |
1510 | ||
1511 | blocknr = segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk; | |
1512 | ssp.bh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers); | |
1513 | ssp.offset = sizeof(struct nilfs_segment_summary); | |
1514 | ||
1515 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) { | |
1e2b68bf | 1516 | if (bh == segbuf->sb_super_root) |
9ff05123 RK |
1517 | break; |
1518 | if (!finfo) { | |
1519 | finfo = nilfs_segctor_map_segsum_entry( | |
1520 | sci, &ssp, sizeof(*finfo)); | |
1521 | ino = le64_to_cpu(finfo->fi_ino); | |
1522 | nblocks = le32_to_cpu(finfo->fi_nblocks); | |
1523 | ndatablk = le32_to_cpu(finfo->fi_ndatablk); | |
1524 | ||
1525 | if (buffer_nilfs_node(bh)) | |
1526 | inode = NILFS_BTNC_I(bh->b_page->mapping); | |
1527 | else | |
1528 | inode = NILFS_AS_I(bh->b_page->mapping); | |
1529 | ||
1530 | if (mode == SC_LSEG_DSYNC) | |
1531 | sc_op = &nilfs_sc_dsync_ops; | |
1532 | else if (ino == NILFS_DAT_INO) | |
1533 | sc_op = &nilfs_sc_dat_ops; | |
1534 | else /* file blocks */ | |
1535 | sc_op = &nilfs_sc_file_ops; | |
1536 | } | |
1537 | bh_org = bh; | |
1538 | get_bh(bh_org); | |
1539 | err = nilfs_bmap_assign(NILFS_I(inode)->i_bmap, &bh, blocknr, | |
1540 | &binfo); | |
1541 | if (bh != bh_org) | |
1542 | nilfs_list_replace_buffer(bh_org, bh); | |
1543 | brelse(bh_org); | |
1544 | if (unlikely(err)) | |
1545 | goto failed_bmap; | |
1546 | ||
1547 | if (ndatablk > 0) | |
1548 | sc_op->write_data_binfo(sci, &ssp, &binfo); | |
1549 | else | |
1550 | sc_op->write_node_binfo(sci, &ssp, &binfo); | |
1551 | ||
1552 | blocknr++; | |
1553 | if (--nblocks == 0) { | |
1554 | finfo = NULL; | |
1555 | if (--nfinfo == 0) | |
1556 | break; | |
1557 | } else if (ndatablk > 0) | |
1558 | ndatablk--; | |
1559 | } | |
1560 | out: | |
1561 | return 0; | |
1562 | ||
1563 | failed_bmap: | |
1564 | err = nilfs_handle_bmap_error(err, __func__, inode, sci->sc_super); | |
1565 | return err; | |
1566 | } | |
1567 | ||
1568 | static int nilfs_segctor_assign(struct nilfs_sc_info *sci, int mode) | |
1569 | { | |
1570 | struct nilfs_segment_buffer *segbuf; | |
1571 | int err; | |
1572 | ||
1573 | list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) { | |
1574 | err = nilfs_segctor_update_payload_blocknr(sci, segbuf, mode); | |
1575 | if (unlikely(err)) | |
1576 | return err; | |
1577 | nilfs_segbuf_fill_in_segsum(segbuf); | |
1578 | } | |
1579 | return 0; | |
1580 | } | |
1581 | ||
1582 | static int | |
1583 | nilfs_copy_replace_page_buffers(struct page *page, struct list_head *out) | |
1584 | { | |
1585 | struct page *clone_page; | |
1586 | struct buffer_head *bh, *head, *bh2; | |
1587 | void *kaddr; | |
1588 | ||
1589 | bh = head = page_buffers(page); | |
1590 | ||
1591 | clone_page = nilfs_alloc_private_page(bh->b_bdev, bh->b_size, 0); | |
1592 | if (unlikely(!clone_page)) | |
1593 | return -ENOMEM; | |
1594 | ||
1595 | bh2 = page_buffers(clone_page); | |
1596 | kaddr = kmap_atomic(page, KM_USER0); | |
1597 | do { | |
1598 | if (list_empty(&bh->b_assoc_buffers)) | |
1599 | continue; | |
1600 | get_bh(bh2); | |
1601 | page_cache_get(clone_page); /* for each bh */ | |
1602 | memcpy(bh2->b_data, kaddr + bh_offset(bh), bh2->b_size); | |
1603 | bh2->b_blocknr = bh->b_blocknr; | |
1604 | list_replace(&bh->b_assoc_buffers, &bh2->b_assoc_buffers); | |
1605 | list_add_tail(&bh->b_assoc_buffers, out); | |
1606 | } while (bh = bh->b_this_page, bh2 = bh2->b_this_page, bh != head); | |
1607 | kunmap_atomic(kaddr, KM_USER0); | |
1608 | ||
1609 | if (!TestSetPageWriteback(clone_page)) | |
1610 | inc_zone_page_state(clone_page, NR_WRITEBACK); | |
1611 | unlock_page(clone_page); | |
1612 | ||
1613 | return 0; | |
1614 | } | |
1615 | ||
1616 | static int nilfs_test_page_to_be_frozen(struct page *page) | |
1617 | { | |
1618 | struct address_space *mapping = page->mapping; | |
1619 | ||
1620 | if (!mapping || !mapping->host || S_ISDIR(mapping->host->i_mode)) | |
1621 | return 0; | |
1622 | ||
1623 | if (page_mapped(page)) { | |
1624 | ClearPageChecked(page); | |
1625 | return 1; | |
1626 | } | |
1627 | return PageChecked(page); | |
1628 | } | |
1629 | ||
1630 | static int nilfs_begin_page_io(struct page *page, struct list_head *out) | |
1631 | { | |
1632 | if (!page || PageWriteback(page)) | |
1633 | /* For split b-tree node pages, this function may be called | |
1634 | twice. We ignore the 2nd or later calls by this check. */ | |
1635 | return 0; | |
1636 | ||
1637 | lock_page(page); | |
1638 | clear_page_dirty_for_io(page); | |
1639 | set_page_writeback(page); | |
1640 | unlock_page(page); | |
1641 | ||
1642 | if (nilfs_test_page_to_be_frozen(page)) { | |
1643 | int err = nilfs_copy_replace_page_buffers(page, out); | |
1644 | if (unlikely(err)) | |
1645 | return err; | |
1646 | } | |
1647 | return 0; | |
1648 | } | |
1649 | ||
1650 | static int nilfs_segctor_prepare_write(struct nilfs_sc_info *sci, | |
1651 | struct page **failed_page) | |
1652 | { | |
1653 | struct nilfs_segment_buffer *segbuf; | |
1654 | struct page *bd_page = NULL, *fs_page = NULL; | |
1655 | struct list_head *list = &sci->sc_copied_buffers; | |
1656 | int err; | |
1657 | ||
1658 | *failed_page = NULL; | |
1659 | list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) { | |
1660 | struct buffer_head *bh; | |
1661 | ||
1662 | list_for_each_entry(bh, &segbuf->sb_segsum_buffers, | |
1663 | b_assoc_buffers) { | |
1664 | if (bh->b_page != bd_page) { | |
1665 | if (bd_page) { | |
1666 | lock_page(bd_page); | |
1667 | clear_page_dirty_for_io(bd_page); | |
1668 | set_page_writeback(bd_page); | |
1669 | unlock_page(bd_page); | |
1670 | } | |
1671 | bd_page = bh->b_page; | |
1672 | } | |
1673 | } | |
1674 | ||
1675 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, | |
1676 | b_assoc_buffers) { | |
1e2b68bf | 1677 | if (bh == segbuf->sb_super_root) { |
9ff05123 RK |
1678 | if (bh->b_page != bd_page) { |
1679 | lock_page(bd_page); | |
1680 | clear_page_dirty_for_io(bd_page); | |
1681 | set_page_writeback(bd_page); | |
1682 | unlock_page(bd_page); | |
1683 | bd_page = bh->b_page; | |
1684 | } | |
1685 | break; | |
1686 | } | |
1687 | if (bh->b_page != fs_page) { | |
1688 | err = nilfs_begin_page_io(fs_page, list); | |
1689 | if (unlikely(err)) { | |
1690 | *failed_page = fs_page; | |
1691 | goto out; | |
1692 | } | |
1693 | fs_page = bh->b_page; | |
1694 | } | |
1695 | } | |
1696 | } | |
1697 | if (bd_page) { | |
1698 | lock_page(bd_page); | |
1699 | clear_page_dirty_for_io(bd_page); | |
1700 | set_page_writeback(bd_page); | |
1701 | unlock_page(bd_page); | |
1702 | } | |
1703 | err = nilfs_begin_page_io(fs_page, list); | |
1704 | if (unlikely(err)) | |
1705 | *failed_page = fs_page; | |
1706 | out: | |
1707 | return err; | |
1708 | } | |
1709 | ||
1710 | static int nilfs_segctor_write(struct nilfs_sc_info *sci, | |
9c965bac | 1711 | struct the_nilfs *nilfs) |
9ff05123 | 1712 | { |
d1c6b72a | 1713 | int ret; |
9ff05123 | 1714 | |
d1c6b72a | 1715 | ret = nilfs_write_logs(&sci->sc_segbufs, nilfs); |
a694291a RK |
1716 | list_splice_tail_init(&sci->sc_segbufs, &sci->sc_write_logs); |
1717 | return ret; | |
9ff05123 RK |
1718 | } |
1719 | ||
9ff05123 RK |
1720 | static void __nilfs_end_page_io(struct page *page, int err) |
1721 | { | |
9ff05123 RK |
1722 | if (!err) { |
1723 | if (!nilfs_page_buffers_clean(page)) | |
1724 | __set_page_dirty_nobuffers(page); | |
1725 | ClearPageError(page); | |
1726 | } else { | |
1727 | __set_page_dirty_nobuffers(page); | |
1728 | SetPageError(page); | |
1729 | } | |
1730 | ||
1731 | if (buffer_nilfs_allocated(page_buffers(page))) { | |
1732 | if (TestClearPageWriteback(page)) | |
1733 | dec_zone_page_state(page, NR_WRITEBACK); | |
1734 | } else | |
1735 | end_page_writeback(page); | |
1736 | } | |
1737 | ||
1738 | static void nilfs_end_page_io(struct page *page, int err) | |
1739 | { | |
1740 | if (!page) | |
1741 | return; | |
1742 | ||
a9777845 | 1743 | if (buffer_nilfs_node(page_buffers(page)) && !PageWriteback(page)) { |
8227b297 RK |
1744 | /* |
1745 | * For b-tree node pages, this function may be called twice | |
1746 | * or more because they might be split in a segment. | |
1747 | */ | |
a9777845 RK |
1748 | if (PageDirty(page)) { |
1749 | /* | |
1750 | * For pages holding split b-tree node buffers, dirty | |
1751 | * flag on the buffers may be cleared discretely. | |
1752 | * In that case, the page is once redirtied for | |
1753 | * remaining buffers, and it must be cancelled if | |
1754 | * all the buffers get cleaned later. | |
1755 | */ | |
1756 | lock_page(page); | |
1757 | if (nilfs_page_buffers_clean(page)) | |
1758 | __nilfs_clear_page_dirty(page); | |
1759 | unlock_page(page); | |
1760 | } | |
9ff05123 | 1761 | return; |
a9777845 | 1762 | } |
9ff05123 RK |
1763 | |
1764 | __nilfs_end_page_io(page, err); | |
1765 | } | |
1766 | ||
1767 | static void nilfs_clear_copied_buffers(struct list_head *list, int err) | |
1768 | { | |
1769 | struct buffer_head *bh, *head; | |
1770 | struct page *page; | |
1771 | ||
1772 | while (!list_empty(list)) { | |
1773 | bh = list_entry(list->next, struct buffer_head, | |
1774 | b_assoc_buffers); | |
1775 | page = bh->b_page; | |
1776 | page_cache_get(page); | |
1777 | head = bh = page_buffers(page); | |
1778 | do { | |
1779 | if (!list_empty(&bh->b_assoc_buffers)) { | |
1780 | list_del_init(&bh->b_assoc_buffers); | |
1781 | if (!err) { | |
1782 | set_buffer_uptodate(bh); | |
1783 | clear_buffer_dirty(bh); | |
1784 | clear_buffer_nilfs_volatile(bh); | |
1785 | } | |
1786 | brelse(bh); /* for b_assoc_buffers */ | |
1787 | } | |
1788 | } while ((bh = bh->b_this_page) != head); | |
1789 | ||
1790 | __nilfs_end_page_io(page, err); | |
1791 | page_cache_release(page); | |
1792 | } | |
1793 | } | |
1794 | ||
a694291a | 1795 | static void nilfs_abort_logs(struct list_head *logs, struct page *failed_page, |
1e2b68bf | 1796 | int err) |
9ff05123 RK |
1797 | { |
1798 | struct nilfs_segment_buffer *segbuf; | |
1799 | struct page *bd_page = NULL, *fs_page = NULL; | |
a694291a | 1800 | struct buffer_head *bh; |
9ff05123 | 1801 | |
a694291a RK |
1802 | if (list_empty(logs)) |
1803 | return; | |
9ff05123 | 1804 | |
a694291a | 1805 | list_for_each_entry(segbuf, logs, sb_list) { |
9ff05123 RK |
1806 | list_for_each_entry(bh, &segbuf->sb_segsum_buffers, |
1807 | b_assoc_buffers) { | |
1808 | if (bh->b_page != bd_page) { | |
1809 | if (bd_page) | |
1810 | end_page_writeback(bd_page); | |
1811 | bd_page = bh->b_page; | |
1812 | } | |
1813 | } | |
1814 | ||
1815 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, | |
1816 | b_assoc_buffers) { | |
1e2b68bf | 1817 | if (bh == segbuf->sb_super_root) { |
9ff05123 RK |
1818 | if (bh->b_page != bd_page) { |
1819 | end_page_writeback(bd_page); | |
1820 | bd_page = bh->b_page; | |
1821 | } | |
1822 | break; | |
1823 | } | |
1824 | if (bh->b_page != fs_page) { | |
1825 | nilfs_end_page_io(fs_page, err); | |
8227b297 | 1826 | if (fs_page && fs_page == failed_page) |
a694291a | 1827 | return; |
9ff05123 RK |
1828 | fs_page = bh->b_page; |
1829 | } | |
1830 | } | |
1831 | } | |
1832 | if (bd_page) | |
1833 | end_page_writeback(bd_page); | |
1834 | ||
1835 | nilfs_end_page_io(fs_page, err); | |
a694291a RK |
1836 | } |
1837 | ||
1838 | static void nilfs_segctor_abort_construction(struct nilfs_sc_info *sci, | |
1839 | struct the_nilfs *nilfs, int err) | |
1840 | { | |
1841 | LIST_HEAD(logs); | |
1842 | int ret; | |
1843 | ||
1844 | list_splice_tail_init(&sci->sc_write_logs, &logs); | |
1845 | ret = nilfs_wait_on_logs(&logs); | |
1e2b68bf | 1846 | nilfs_abort_logs(&logs, NULL, ret ? : err); |
a694291a RK |
1847 | |
1848 | list_splice_tail_init(&sci->sc_segbufs, &logs); | |
1849 | nilfs_cancel_segusage(&logs, nilfs->ns_sufile); | |
1850 | nilfs_free_incomplete_logs(&logs, nilfs); | |
9ff05123 | 1851 | nilfs_clear_copied_buffers(&sci->sc_copied_buffers, err); |
a694291a RK |
1852 | |
1853 | if (sci->sc_stage.flags & NILFS_CF_SUFREED) { | |
1854 | ret = nilfs_sufile_cancel_freev(nilfs->ns_sufile, | |
1855 | sci->sc_freesegs, | |
1856 | sci->sc_nfreesegs, | |
1857 | NULL); | |
1858 | WARN_ON(ret); /* do not happen */ | |
1859 | } | |
1860 | ||
1861 | nilfs_destroy_logs(&logs); | |
9ff05123 RK |
1862 | } |
1863 | ||
1864 | static void nilfs_set_next_segment(struct the_nilfs *nilfs, | |
1865 | struct nilfs_segment_buffer *segbuf) | |
1866 | { | |
1867 | nilfs->ns_segnum = segbuf->sb_segnum; | |
1868 | nilfs->ns_nextnum = segbuf->sb_nextnum; | |
1869 | nilfs->ns_pseg_offset = segbuf->sb_pseg_start - segbuf->sb_fseg_start | |
1870 | + segbuf->sb_sum.nblocks; | |
1871 | nilfs->ns_seg_seq = segbuf->sb_sum.seg_seq; | |
1872 | nilfs->ns_ctime = segbuf->sb_sum.ctime; | |
1873 | } | |
1874 | ||
1875 | static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci) | |
1876 | { | |
1877 | struct nilfs_segment_buffer *segbuf; | |
1878 | struct page *bd_page = NULL, *fs_page = NULL; | |
e605f0a7 | 1879 | struct the_nilfs *nilfs = sci->sc_sbi->s_nilfs; |
1e2b68bf | 1880 | int update_sr = false; |
9ff05123 | 1881 | |
a694291a | 1882 | list_for_each_entry(segbuf, &sci->sc_write_logs, sb_list) { |
9ff05123 RK |
1883 | struct buffer_head *bh; |
1884 | ||
1885 | list_for_each_entry(bh, &segbuf->sb_segsum_buffers, | |
1886 | b_assoc_buffers) { | |
1887 | set_buffer_uptodate(bh); | |
1888 | clear_buffer_dirty(bh); | |
1889 | if (bh->b_page != bd_page) { | |
1890 | if (bd_page) | |
1891 | end_page_writeback(bd_page); | |
1892 | bd_page = bh->b_page; | |
1893 | } | |
1894 | } | |
1895 | /* | |
1896 | * We assume that the buffers which belong to the same page | |
1897 | * continue over the buffer list. | |
1898 | * Under this assumption, the last BHs of pages is | |
1899 | * identifiable by the discontinuity of bh->b_page | |
1900 | * (page != fs_page). | |
1901 | * | |
1902 | * For B-tree node blocks, however, this assumption is not | |
1903 | * guaranteed. The cleanup code of B-tree node pages needs | |
1904 | * special care. | |
1905 | */ | |
1906 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, | |
1907 | b_assoc_buffers) { | |
1908 | set_buffer_uptodate(bh); | |
1909 | clear_buffer_dirty(bh); | |
1910 | clear_buffer_nilfs_volatile(bh); | |
b1f6a4f2 | 1911 | clear_buffer_nilfs_redirected(bh); |
1e2b68bf | 1912 | if (bh == segbuf->sb_super_root) { |
9ff05123 RK |
1913 | if (bh->b_page != bd_page) { |
1914 | end_page_writeback(bd_page); | |
1915 | bd_page = bh->b_page; | |
1916 | } | |
1e2b68bf | 1917 | update_sr = true; |
9ff05123 RK |
1918 | break; |
1919 | } | |
1920 | if (bh->b_page != fs_page) { | |
1921 | nilfs_end_page_io(fs_page, 0); | |
1922 | fs_page = bh->b_page; | |
1923 | } | |
1924 | } | |
1925 | ||
4762077c RK |
1926 | if (!nilfs_segbuf_simplex(segbuf)) { |
1927 | if (segbuf->sb_sum.flags & NILFS_SS_LOGBGN) { | |
9ff05123 RK |
1928 | set_bit(NILFS_SC_UNCLOSED, &sci->sc_flags); |
1929 | sci->sc_lseg_stime = jiffies; | |
1930 | } | |
4762077c | 1931 | if (segbuf->sb_sum.flags & NILFS_SS_LOGEND) |
9ff05123 RK |
1932 | clear_bit(NILFS_SC_UNCLOSED, &sci->sc_flags); |
1933 | } | |
1934 | } | |
1935 | /* | |
1936 | * Since pages may continue over multiple segment buffers, | |
1937 | * end of the last page must be checked outside of the loop. | |
1938 | */ | |
1939 | if (bd_page) | |
1940 | end_page_writeback(bd_page); | |
1941 | ||
1942 | nilfs_end_page_io(fs_page, 0); | |
1943 | ||
1944 | nilfs_clear_copied_buffers(&sci->sc_copied_buffers, 0); | |
1945 | ||
1946 | nilfs_drop_collected_inodes(&sci->sc_dirty_files); | |
1947 | ||
c1c1d709 | 1948 | if (nilfs_doing_gc()) |
9ff05123 | 1949 | nilfs_drop_collected_inodes(&sci->sc_gc_inodes); |
c1c1d709 | 1950 | else |
9ff05123 | 1951 | nilfs->ns_nongc_ctime = sci->sc_seg_ctime; |
9ff05123 RK |
1952 | |
1953 | sci->sc_nblk_inc += sci->sc_nblk_this_inc; | |
1954 | ||
a694291a | 1955 | segbuf = NILFS_LAST_SEGBUF(&sci->sc_write_logs); |
9ff05123 RK |
1956 | nilfs_set_next_segment(nilfs, segbuf); |
1957 | ||
1958 | if (update_sr) { | |
1959 | nilfs_set_last_segment(nilfs, segbuf->sb_pseg_start, | |
e339ad31 | 1960 | segbuf->sb_sum.seg_seq, nilfs->ns_cno++); |
9ff05123 | 1961 | |
c96fa464 | 1962 | clear_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags); |
9ff05123 RK |
1963 | clear_bit(NILFS_SC_DIRTY, &sci->sc_flags); |
1964 | set_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags); | |
a694291a | 1965 | nilfs_segctor_clear_metadata_dirty(sci); |
9ff05123 RK |
1966 | } else |
1967 | clear_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags); | |
1968 | } | |
1969 | ||
a694291a RK |
1970 | static int nilfs_segctor_wait(struct nilfs_sc_info *sci) |
1971 | { | |
1972 | int ret; | |
1973 | ||
1974 | ret = nilfs_wait_on_logs(&sci->sc_write_logs); | |
1975 | if (!ret) { | |
1976 | nilfs_segctor_complete_write(sci); | |
1977 | nilfs_destroy_logs(&sci->sc_write_logs); | |
1978 | } | |
1979 | return ret; | |
1980 | } | |
1981 | ||
9ff05123 RK |
1982 | static int nilfs_segctor_check_in_files(struct nilfs_sc_info *sci, |
1983 | struct nilfs_sb_info *sbi) | |
1984 | { | |
1985 | struct nilfs_inode_info *ii, *n; | |
e912a5b6 | 1986 | struct inode *ifile = sci->sc_root->ifile; |
9ff05123 RK |
1987 | |
1988 | spin_lock(&sbi->s_inode_lock); | |
1989 | retry: | |
1990 | list_for_each_entry_safe(ii, n, &sbi->s_dirty_files, i_dirty) { | |
1991 | if (!ii->i_bh) { | |
1992 | struct buffer_head *ibh; | |
1993 | int err; | |
1994 | ||
1995 | spin_unlock(&sbi->s_inode_lock); | |
1996 | err = nilfs_ifile_get_inode_block( | |
e912a5b6 | 1997 | ifile, ii->vfs_inode.i_ino, &ibh); |
9ff05123 RK |
1998 | if (unlikely(err)) { |
1999 | nilfs_warning(sbi->s_super, __func__, | |
2000 | "failed to get inode block.\n"); | |
2001 | return err; | |
2002 | } | |
2003 | nilfs_mdt_mark_buffer_dirty(ibh); | |
e912a5b6 | 2004 | nilfs_mdt_mark_dirty(ifile); |
9ff05123 RK |
2005 | spin_lock(&sbi->s_inode_lock); |
2006 | if (likely(!ii->i_bh)) | |
2007 | ii->i_bh = ibh; | |
2008 | else | |
2009 | brelse(ibh); | |
2010 | goto retry; | |
2011 | } | |
9ff05123 RK |
2012 | |
2013 | clear_bit(NILFS_I_QUEUED, &ii->i_state); | |
2014 | set_bit(NILFS_I_BUSY, &ii->i_state); | |
2015 | list_del(&ii->i_dirty); | |
2016 | list_add_tail(&ii->i_dirty, &sci->sc_dirty_files); | |
2017 | } | |
2018 | spin_unlock(&sbi->s_inode_lock); | |
2019 | ||
9ff05123 RK |
2020 | return 0; |
2021 | } | |
2022 | ||
2023 | static void nilfs_segctor_check_out_files(struct nilfs_sc_info *sci, | |
2024 | struct nilfs_sb_info *sbi) | |
2025 | { | |
2026 | struct nilfs_transaction_info *ti = current->journal_info; | |
2027 | struct nilfs_inode_info *ii, *n; | |
9ff05123 RK |
2028 | |
2029 | spin_lock(&sbi->s_inode_lock); | |
2030 | list_for_each_entry_safe(ii, n, &sci->sc_dirty_files, i_dirty) { | |
2031 | if (!test_and_clear_bit(NILFS_I_UPDATED, &ii->i_state) || | |
6c43f410 | 2032 | test_bit(NILFS_I_DIRTY, &ii->i_state)) |
9ff05123 | 2033 | continue; |
6c43f410 | 2034 | |
9ff05123 RK |
2035 | clear_bit(NILFS_I_BUSY, &ii->i_state); |
2036 | brelse(ii->i_bh); | |
2037 | ii->i_bh = NULL; | |
2038 | list_del(&ii->i_dirty); | |
2039 | list_add_tail(&ii->i_dirty, &ti->ti_garbage); | |
2040 | } | |
2041 | spin_unlock(&sbi->s_inode_lock); | |
2042 | } | |
2043 | ||
9ff05123 RK |
2044 | /* |
2045 | * Main procedure of segment constructor | |
2046 | */ | |
2047 | static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode) | |
2048 | { | |
2049 | struct nilfs_sb_info *sbi = sci->sc_sbi; | |
2050 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
2051 | struct page *failed_page; | |
1e2b68bf | 2052 | int err; |
9ff05123 RK |
2053 | |
2054 | sci->sc_stage.scnt = NILFS_ST_INIT; | |
6c43f410 | 2055 | sci->sc_cno = nilfs->ns_cno; |
9ff05123 RK |
2056 | |
2057 | err = nilfs_segctor_check_in_files(sci, sbi); | |
2058 | if (unlikely(err)) | |
2059 | goto out; | |
2060 | ||
e912a5b6 | 2061 | if (nilfs_test_metadata_dirty(nilfs, sci->sc_root)) |
9ff05123 RK |
2062 | set_bit(NILFS_SC_DIRTY, &sci->sc_flags); |
2063 | ||
2064 | if (nilfs_segctor_clean(sci)) | |
2065 | goto out; | |
2066 | ||
2067 | do { | |
2068 | sci->sc_stage.flags &= ~NILFS_CF_HISTORY_MASK; | |
2069 | ||
2070 | err = nilfs_segctor_begin_construction(sci, nilfs); | |
2071 | if (unlikely(err)) | |
2072 | goto out; | |
2073 | ||
2074 | /* Update time stamp */ | |
2075 | sci->sc_seg_ctime = get_seconds(); | |
2076 | ||
2077 | err = nilfs_segctor_collect(sci, nilfs, mode); | |
2078 | if (unlikely(err)) | |
2079 | goto failed; | |
2080 | ||
9ff05123 RK |
2081 | /* Avoid empty segment */ |
2082 | if (sci->sc_stage.scnt == NILFS_ST_DONE && | |
4762077c | 2083 | nilfs_segbuf_empty(sci->sc_curseg)) { |
a694291a | 2084 | nilfs_segctor_abort_construction(sci, nilfs, 1); |
9ff05123 RK |
2085 | goto out; |
2086 | } | |
2087 | ||
2088 | err = nilfs_segctor_assign(sci, mode); | |
2089 | if (unlikely(err)) | |
2090 | goto failed; | |
2091 | ||
9ff05123 | 2092 | if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED) |
e912a5b6 | 2093 | nilfs_segctor_fill_in_file_bmap(sci); |
9ff05123 | 2094 | |
1e2b68bf RK |
2095 | if (mode == SC_LSEG_SR && |
2096 | sci->sc_stage.scnt >= NILFS_ST_CPFILE) { | |
9ff05123 RK |
2097 | err = nilfs_segctor_fill_in_checkpoint(sci); |
2098 | if (unlikely(err)) | |
a694291a | 2099 | goto failed_to_write; |
9ff05123 RK |
2100 | |
2101 | nilfs_segctor_fill_in_super_root(sci, nilfs); | |
2102 | } | |
2103 | nilfs_segctor_update_segusage(sci, nilfs->ns_sufile); | |
2104 | ||
2105 | /* Write partial segments */ | |
2106 | err = nilfs_segctor_prepare_write(sci, &failed_page); | |
a694291a | 2107 | if (err) { |
1e2b68bf | 2108 | nilfs_abort_logs(&sci->sc_segbufs, failed_page, err); |
9ff05123 | 2109 | goto failed_to_write; |
a694291a | 2110 | } |
aaed1d5b RK |
2111 | |
2112 | nilfs_add_checksums_on_logs(&sci->sc_segbufs, | |
2113 | nilfs->ns_crc_seed); | |
9ff05123 | 2114 | |
9c965bac | 2115 | err = nilfs_segctor_write(sci, nilfs); |
9ff05123 RK |
2116 | if (unlikely(err)) |
2117 | goto failed_to_write; | |
2118 | ||
a694291a RK |
2119 | if (sci->sc_stage.scnt == NILFS_ST_DONE || |
2120 | nilfs->ns_blocksize_bits != PAGE_CACHE_SHIFT) { | |
2121 | /* | |
2122 | * At this point, we avoid double buffering | |
2123 | * for blocksize < pagesize because page dirty | |
2124 | * flag is turned off during write and dirty | |
2125 | * buffers are not properly collected for | |
2126 | * pages crossing over segments. | |
2127 | */ | |
2128 | err = nilfs_segctor_wait(sci); | |
2129 | if (err) | |
2130 | goto failed_to_write; | |
2131 | } | |
9ff05123 RK |
2132 | } while (sci->sc_stage.scnt != NILFS_ST_DONE); |
2133 | ||
9ff05123 | 2134 | out: |
9ff05123 RK |
2135 | nilfs_segctor_check_out_files(sci, sbi); |
2136 | return err; | |
2137 | ||
2138 | failed_to_write: | |
9ff05123 RK |
2139 | if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED) |
2140 | nilfs_redirty_inodes(&sci->sc_dirty_files); | |
9ff05123 RK |
2141 | |
2142 | failed: | |
2143 | if (nilfs_doing_gc()) | |
2144 | nilfs_redirty_inodes(&sci->sc_gc_inodes); | |
a694291a | 2145 | nilfs_segctor_abort_construction(sci, nilfs, err); |
9ff05123 RK |
2146 | goto out; |
2147 | } | |
2148 | ||
2149 | /** | |
9ccf56c1 | 2150 | * nilfs_segctor_start_timer - set timer of background write |
9ff05123 RK |
2151 | * @sci: nilfs_sc_info |
2152 | * | |
2153 | * If the timer has already been set, it ignores the new request. | |
2154 | * This function MUST be called within a section locking the segment | |
2155 | * semaphore. | |
2156 | */ | |
2157 | static void nilfs_segctor_start_timer(struct nilfs_sc_info *sci) | |
2158 | { | |
2159 | spin_lock(&sci->sc_state_lock); | |
fdce895e LH |
2160 | if (!(sci->sc_state & NILFS_SEGCTOR_COMMIT)) { |
2161 | sci->sc_timer.expires = jiffies + sci->sc_interval; | |
2162 | add_timer(&sci->sc_timer); | |
9ff05123 RK |
2163 | sci->sc_state |= NILFS_SEGCTOR_COMMIT; |
2164 | } | |
2165 | spin_unlock(&sci->sc_state_lock); | |
2166 | } | |
2167 | ||
2168 | static void nilfs_segctor_do_flush(struct nilfs_sc_info *sci, int bn) | |
2169 | { | |
2170 | spin_lock(&sci->sc_state_lock); | |
2171 | if (!(sci->sc_flush_request & (1 << bn))) { | |
2172 | unsigned long prev_req = sci->sc_flush_request; | |
2173 | ||
2174 | sci->sc_flush_request |= (1 << bn); | |
2175 | if (!prev_req) | |
2176 | wake_up(&sci->sc_wait_daemon); | |
2177 | } | |
2178 | spin_unlock(&sci->sc_state_lock); | |
2179 | } | |
2180 | ||
2181 | /** | |
2182 | * nilfs_flush_segment - trigger a segment construction for resource control | |
2183 | * @sb: super block | |
2184 | * @ino: inode number of the file to be flushed out. | |
2185 | */ | |
2186 | void nilfs_flush_segment(struct super_block *sb, ino_t ino) | |
2187 | { | |
2188 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
2189 | struct nilfs_sc_info *sci = NILFS_SC(sbi); | |
2190 | ||
2191 | if (!sci || nilfs_doing_construction()) | |
2192 | return; | |
2193 | nilfs_segctor_do_flush(sci, NILFS_MDT_INODE(sb, ino) ? ino : 0); | |
2194 | /* assign bit 0 to data files */ | |
2195 | } | |
2196 | ||
9ff05123 RK |
2197 | struct nilfs_segctor_wait_request { |
2198 | wait_queue_t wq; | |
2199 | __u32 seq; | |
2200 | int err; | |
2201 | atomic_t done; | |
2202 | }; | |
2203 | ||
2204 | static int nilfs_segctor_sync(struct nilfs_sc_info *sci) | |
2205 | { | |
2206 | struct nilfs_segctor_wait_request wait_req; | |
2207 | int err = 0; | |
2208 | ||
2209 | spin_lock(&sci->sc_state_lock); | |
2210 | init_wait(&wait_req.wq); | |
2211 | wait_req.err = 0; | |
2212 | atomic_set(&wait_req.done, 0); | |
2213 | wait_req.seq = ++sci->sc_seq_request; | |
2214 | spin_unlock(&sci->sc_state_lock); | |
2215 | ||
2216 | init_waitqueue_entry(&wait_req.wq, current); | |
2217 | add_wait_queue(&sci->sc_wait_request, &wait_req.wq); | |
2218 | set_current_state(TASK_INTERRUPTIBLE); | |
2219 | wake_up(&sci->sc_wait_daemon); | |
2220 | ||
2221 | for (;;) { | |
2222 | if (atomic_read(&wait_req.done)) { | |
2223 | err = wait_req.err; | |
2224 | break; | |
2225 | } | |
2226 | if (!signal_pending(current)) { | |
2227 | schedule(); | |
2228 | continue; | |
2229 | } | |
2230 | err = -ERESTARTSYS; | |
2231 | break; | |
2232 | } | |
2233 | finish_wait(&sci->sc_wait_request, &wait_req.wq); | |
2234 | return err; | |
2235 | } | |
2236 | ||
2237 | static void nilfs_segctor_wakeup(struct nilfs_sc_info *sci, int err) | |
2238 | { | |
2239 | struct nilfs_segctor_wait_request *wrq, *n; | |
2240 | unsigned long flags; | |
2241 | ||
2242 | spin_lock_irqsave(&sci->sc_wait_request.lock, flags); | |
2243 | list_for_each_entry_safe(wrq, n, &sci->sc_wait_request.task_list, | |
2244 | wq.task_list) { | |
2245 | if (!atomic_read(&wrq->done) && | |
2246 | nilfs_cnt32_ge(sci->sc_seq_done, wrq->seq)) { | |
2247 | wrq->err = err; | |
2248 | atomic_set(&wrq->done, 1); | |
2249 | } | |
2250 | if (atomic_read(&wrq->done)) { | |
2251 | wrq->wq.func(&wrq->wq, | |
2252 | TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, | |
2253 | 0, NULL); | |
2254 | } | |
2255 | } | |
2256 | spin_unlock_irqrestore(&sci->sc_wait_request.lock, flags); | |
2257 | } | |
2258 | ||
2259 | /** | |
2260 | * nilfs_construct_segment - construct a logical segment | |
2261 | * @sb: super block | |
2262 | * | |
2263 | * Return Value: On success, 0 is retured. On errors, one of the following | |
2264 | * negative error code is returned. | |
2265 | * | |
2266 | * %-EROFS - Read only filesystem. | |
2267 | * | |
2268 | * %-EIO - I/O error | |
2269 | * | |
2270 | * %-ENOSPC - No space left on device (only in a panic state). | |
2271 | * | |
2272 | * %-ERESTARTSYS - Interrupted. | |
2273 | * | |
2274 | * %-ENOMEM - Insufficient memory available. | |
2275 | */ | |
2276 | int nilfs_construct_segment(struct super_block *sb) | |
2277 | { | |
2278 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
2279 | struct nilfs_sc_info *sci = NILFS_SC(sbi); | |
2280 | struct nilfs_transaction_info *ti; | |
2281 | int err; | |
2282 | ||
2283 | if (!sci) | |
2284 | return -EROFS; | |
2285 | ||
2286 | /* A call inside transactions causes a deadlock. */ | |
2287 | BUG_ON((ti = current->journal_info) && ti->ti_magic == NILFS_TI_MAGIC); | |
2288 | ||
2289 | err = nilfs_segctor_sync(sci); | |
2290 | return err; | |
2291 | } | |
2292 | ||
2293 | /** | |
2294 | * nilfs_construct_dsync_segment - construct a data-only logical segment | |
2295 | * @sb: super block | |
f30bf3e4 RK |
2296 | * @inode: inode whose data blocks should be written out |
2297 | * @start: start byte offset | |
2298 | * @end: end byte offset (inclusive) | |
9ff05123 RK |
2299 | * |
2300 | * Return Value: On success, 0 is retured. On errors, one of the following | |
2301 | * negative error code is returned. | |
2302 | * | |
2303 | * %-EROFS - Read only filesystem. | |
2304 | * | |
2305 | * %-EIO - I/O error | |
2306 | * | |
2307 | * %-ENOSPC - No space left on device (only in a panic state). | |
2308 | * | |
2309 | * %-ERESTARTSYS - Interrupted. | |
2310 | * | |
2311 | * %-ENOMEM - Insufficient memory available. | |
2312 | */ | |
f30bf3e4 RK |
2313 | int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode, |
2314 | loff_t start, loff_t end) | |
9ff05123 RK |
2315 | { |
2316 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
2317 | struct nilfs_sc_info *sci = NILFS_SC(sbi); | |
2318 | struct nilfs_inode_info *ii; | |
2319 | struct nilfs_transaction_info ti; | |
2320 | int err = 0; | |
2321 | ||
2322 | if (!sci) | |
2323 | return -EROFS; | |
2324 | ||
2325 | nilfs_transaction_lock(sbi, &ti, 0); | |
2326 | ||
2327 | ii = NILFS_I(inode); | |
2328 | if (test_bit(NILFS_I_INODE_DIRTY, &ii->i_state) || | |
2329 | nilfs_test_opt(sbi, STRICT_ORDER) || | |
2330 | test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) || | |
2331 | nilfs_discontinued(sbi->s_nilfs)) { | |
2332 | nilfs_transaction_unlock(sbi); | |
2333 | err = nilfs_segctor_sync(sci); | |
2334 | return err; | |
2335 | } | |
2336 | ||
2337 | spin_lock(&sbi->s_inode_lock); | |
2338 | if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && | |
2339 | !test_bit(NILFS_I_BUSY, &ii->i_state)) { | |
2340 | spin_unlock(&sbi->s_inode_lock); | |
2341 | nilfs_transaction_unlock(sbi); | |
2342 | return 0; | |
2343 | } | |
2344 | spin_unlock(&sbi->s_inode_lock); | |
f30bf3e4 RK |
2345 | sci->sc_dsync_inode = ii; |
2346 | sci->sc_dsync_start = start; | |
2347 | sci->sc_dsync_end = end; | |
9ff05123 RK |
2348 | |
2349 | err = nilfs_segctor_do_construct(sci, SC_LSEG_DSYNC); | |
2350 | ||
2351 | nilfs_transaction_unlock(sbi); | |
2352 | return err; | |
2353 | } | |
2354 | ||
9ff05123 RK |
2355 | #define FLUSH_FILE_BIT (0x1) /* data file only */ |
2356 | #define FLUSH_DAT_BIT (1 << NILFS_DAT_INO) /* DAT only */ | |
2357 | ||
dcd76186 RK |
2358 | /** |
2359 | * nilfs_segctor_accept - record accepted sequence count of log-write requests | |
2360 | * @sci: segment constructor object | |
2361 | */ | |
2362 | static void nilfs_segctor_accept(struct nilfs_sc_info *sci) | |
9ff05123 | 2363 | { |
9ff05123 | 2364 | spin_lock(&sci->sc_state_lock); |
dcd76186 | 2365 | sci->sc_seq_accepted = sci->sc_seq_request; |
9ff05123 | 2366 | spin_unlock(&sci->sc_state_lock); |
fdce895e | 2367 | del_timer_sync(&sci->sc_timer); |
9ff05123 RK |
2368 | } |
2369 | ||
dcd76186 RK |
2370 | /** |
2371 | * nilfs_segctor_notify - notify the result of request to caller threads | |
2372 | * @sci: segment constructor object | |
2373 | * @mode: mode of log forming | |
2374 | * @err: error code to be notified | |
2375 | */ | |
2376 | static void nilfs_segctor_notify(struct nilfs_sc_info *sci, int mode, int err) | |
9ff05123 RK |
2377 | { |
2378 | /* Clear requests (even when the construction failed) */ | |
2379 | spin_lock(&sci->sc_state_lock); | |
2380 | ||
dcd76186 | 2381 | if (mode == SC_LSEG_SR) { |
aeda7f63 | 2382 | sci->sc_state &= ~NILFS_SEGCTOR_COMMIT; |
dcd76186 RK |
2383 | sci->sc_seq_done = sci->sc_seq_accepted; |
2384 | nilfs_segctor_wakeup(sci, err); | |
9ff05123 | 2385 | sci->sc_flush_request = 0; |
aeda7f63 | 2386 | } else { |
dcd76186 | 2387 | if (mode == SC_FLUSH_FILE) |
aeda7f63 | 2388 | sci->sc_flush_request &= ~FLUSH_FILE_BIT; |
dcd76186 | 2389 | else if (mode == SC_FLUSH_DAT) |
aeda7f63 RK |
2390 | sci->sc_flush_request &= ~FLUSH_DAT_BIT; |
2391 | ||
2392 | /* re-enable timer if checkpoint creation was not done */ | |
fdce895e LH |
2393 | if ((sci->sc_state & NILFS_SEGCTOR_COMMIT) && |
2394 | time_before(jiffies, sci->sc_timer.expires)) | |
2395 | add_timer(&sci->sc_timer); | |
aeda7f63 | 2396 | } |
9ff05123 RK |
2397 | spin_unlock(&sci->sc_state_lock); |
2398 | } | |
2399 | ||
dcd76186 RK |
2400 | /** |
2401 | * nilfs_segctor_construct - form logs and write them to disk | |
2402 | * @sci: segment constructor object | |
2403 | * @mode: mode of log forming | |
2404 | */ | |
2405 | static int nilfs_segctor_construct(struct nilfs_sc_info *sci, int mode) | |
9ff05123 RK |
2406 | { |
2407 | struct nilfs_sb_info *sbi = sci->sc_sbi; | |
2408 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
d26493b6 | 2409 | struct nilfs_super_block **sbp; |
9ff05123 RK |
2410 | int err = 0; |
2411 | ||
dcd76186 RK |
2412 | nilfs_segctor_accept(sci); |
2413 | ||
9ff05123 | 2414 | if (nilfs_discontinued(nilfs)) |
dcd76186 RK |
2415 | mode = SC_LSEG_SR; |
2416 | if (!nilfs_segctor_confirm(sci)) | |
2417 | err = nilfs_segctor_do_construct(sci, mode); | |
2418 | ||
9ff05123 | 2419 | if (likely(!err)) { |
dcd76186 | 2420 | if (mode != SC_FLUSH_DAT) |
9ff05123 RK |
2421 | atomic_set(&nilfs->ns_ndirtyblks, 0); |
2422 | if (test_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags) && | |
2423 | nilfs_discontinued(nilfs)) { | |
2424 | down_write(&nilfs->ns_sem); | |
d26493b6 | 2425 | err = -EIO; |
b2ac86e1 JS |
2426 | sbp = nilfs_prepare_super(sbi, |
2427 | nilfs_sb_will_flip(nilfs)); | |
2428 | if (likely(sbp)) { | |
2429 | nilfs_set_log_cursor(sbp[0], nilfs); | |
2430 | err = nilfs_commit_super(sbi, NILFS_SB_COMMIT); | |
2431 | } | |
9ff05123 RK |
2432 | up_write(&nilfs->ns_sem); |
2433 | } | |
2434 | } | |
dcd76186 RK |
2435 | |
2436 | nilfs_segctor_notify(sci, mode, err); | |
9ff05123 RK |
2437 | return err; |
2438 | } | |
2439 | ||
2440 | static void nilfs_construction_timeout(unsigned long data) | |
2441 | { | |
2442 | struct task_struct *p = (struct task_struct *)data; | |
2443 | wake_up_process(p); | |
2444 | } | |
2445 | ||
2446 | static void | |
2447 | nilfs_remove_written_gcinodes(struct the_nilfs *nilfs, struct list_head *head) | |
2448 | { | |
2449 | struct nilfs_inode_info *ii, *n; | |
2450 | ||
2451 | list_for_each_entry_safe(ii, n, head, i_dirty) { | |
2452 | if (!test_bit(NILFS_I_UPDATED, &ii->i_state)) | |
2453 | continue; | |
9ff05123 | 2454 | list_del_init(&ii->i_dirty); |
263d90ce | 2455 | iput(&ii->vfs_inode); |
9ff05123 RK |
2456 | } |
2457 | } | |
2458 | ||
4f6b8288 RK |
2459 | int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv, |
2460 | void **kbufs) | |
9ff05123 RK |
2461 | { |
2462 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
2463 | struct nilfs_sc_info *sci = NILFS_SC(sbi); | |
2464 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
2465 | struct nilfs_transaction_info ti; | |
9ff05123 RK |
2466 | int err; |
2467 | ||
2468 | if (unlikely(!sci)) | |
2469 | return -EROFS; | |
2470 | ||
2471 | nilfs_transaction_lock(sbi, &ti, 1); | |
2472 | ||
c1c1d709 | 2473 | err = nilfs_mdt_save_to_shadow_map(nilfs->ns_dat); |
9ff05123 RK |
2474 | if (unlikely(err)) |
2475 | goto out_unlock; | |
071cb4b8 | 2476 | |
4f6b8288 | 2477 | err = nilfs_ioctl_prepare_clean_segments(nilfs, argv, kbufs); |
c1c1d709 RK |
2478 | if (unlikely(err)) { |
2479 | nilfs_mdt_restore_from_shadow_map(nilfs->ns_dat); | |
9ff05123 | 2480 | goto out_unlock; |
c1c1d709 | 2481 | } |
9ff05123 | 2482 | |
071cb4b8 RK |
2483 | sci->sc_freesegs = kbufs[4]; |
2484 | sci->sc_nfreesegs = argv[4].v_nmembs; | |
0935db74 | 2485 | list_splice_tail_init(&nilfs->ns_gc_inodes, &sci->sc_gc_inodes); |
9ff05123 RK |
2486 | |
2487 | for (;;) { | |
dcd76186 | 2488 | err = nilfs_segctor_construct(sci, SC_LSEG_SR); |
9ff05123 | 2489 | nilfs_remove_written_gcinodes(nilfs, &sci->sc_gc_inodes); |
9ff05123 RK |
2490 | |
2491 | if (likely(!err)) | |
2492 | break; | |
2493 | ||
2494 | nilfs_warning(sb, __func__, | |
2495 | "segment construction failed. (err=%d)", err); | |
2496 | set_current_state(TASK_INTERRUPTIBLE); | |
2497 | schedule_timeout(sci->sc_interval); | |
2498 | } | |
e902ec99 JS |
2499 | if (nilfs_test_opt(sbi, DISCARD)) { |
2500 | int ret = nilfs_discard_segments(nilfs, sci->sc_freesegs, | |
2501 | sci->sc_nfreesegs); | |
2502 | if (ret) { | |
2503 | printk(KERN_WARNING | |
2504 | "NILFS warning: error %d on discard request, " | |
2505 | "turning discards off for the device\n", ret); | |
2506 | nilfs_clear_opt(sbi, DISCARD); | |
2507 | } | |
2508 | } | |
9ff05123 RK |
2509 | |
2510 | out_unlock: | |
071cb4b8 RK |
2511 | sci->sc_freesegs = NULL; |
2512 | sci->sc_nfreesegs = 0; | |
c1c1d709 | 2513 | nilfs_mdt_clear_shadow_map(nilfs->ns_dat); |
9ff05123 RK |
2514 | nilfs_transaction_unlock(sbi); |
2515 | return err; | |
2516 | } | |
2517 | ||
2518 | static void nilfs_segctor_thread_construct(struct nilfs_sc_info *sci, int mode) | |
2519 | { | |
2520 | struct nilfs_sb_info *sbi = sci->sc_sbi; | |
2521 | struct nilfs_transaction_info ti; | |
9ff05123 RK |
2522 | |
2523 | nilfs_transaction_lock(sbi, &ti, 0); | |
dcd76186 | 2524 | nilfs_segctor_construct(sci, mode); |
9ff05123 RK |
2525 | |
2526 | /* | |
2527 | * Unclosed segment should be retried. We do this using sc_timer. | |
2528 | * Timeout of sc_timer will invoke complete construction which leads | |
2529 | * to close the current logical segment. | |
2530 | */ | |
2531 | if (test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) | |
2532 | nilfs_segctor_start_timer(sci); | |
2533 | ||
2534 | nilfs_transaction_unlock(sbi); | |
2535 | } | |
2536 | ||
2537 | static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *sci) | |
2538 | { | |
2539 | int mode = 0; | |
2540 | int err; | |
2541 | ||
2542 | spin_lock(&sci->sc_state_lock); | |
2543 | mode = (sci->sc_flush_request & FLUSH_DAT_BIT) ? | |
2544 | SC_FLUSH_DAT : SC_FLUSH_FILE; | |
2545 | spin_unlock(&sci->sc_state_lock); | |
2546 | ||
2547 | if (mode) { | |
2548 | err = nilfs_segctor_do_construct(sci, mode); | |
2549 | ||
2550 | spin_lock(&sci->sc_state_lock); | |
2551 | sci->sc_flush_request &= (mode == SC_FLUSH_FILE) ? | |
2552 | ~FLUSH_FILE_BIT : ~FLUSH_DAT_BIT; | |
2553 | spin_unlock(&sci->sc_state_lock); | |
2554 | } | |
2555 | clear_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags); | |
2556 | } | |
2557 | ||
2558 | static int nilfs_segctor_flush_mode(struct nilfs_sc_info *sci) | |
2559 | { | |
2560 | if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) || | |
2561 | time_before(jiffies, sci->sc_lseg_stime + sci->sc_mjcp_freq)) { | |
2562 | if (!(sci->sc_flush_request & ~FLUSH_FILE_BIT)) | |
2563 | return SC_FLUSH_FILE; | |
2564 | else if (!(sci->sc_flush_request & ~FLUSH_DAT_BIT)) | |
2565 | return SC_FLUSH_DAT; | |
2566 | } | |
2567 | return SC_LSEG_SR; | |
2568 | } | |
2569 | ||
2570 | /** | |
2571 | * nilfs_segctor_thread - main loop of the segment constructor thread. | |
2572 | * @arg: pointer to a struct nilfs_sc_info. | |
2573 | * | |
2574 | * nilfs_segctor_thread() initializes a timer and serves as a daemon | |
2575 | * to execute segment constructions. | |
2576 | */ | |
2577 | static int nilfs_segctor_thread(void *arg) | |
2578 | { | |
2579 | struct nilfs_sc_info *sci = (struct nilfs_sc_info *)arg; | |
e605f0a7 | 2580 | struct the_nilfs *nilfs = sci->sc_sbi->s_nilfs; |
9ff05123 RK |
2581 | int timeout = 0; |
2582 | ||
fdce895e LH |
2583 | sci->sc_timer.data = (unsigned long)current; |
2584 | sci->sc_timer.function = nilfs_construction_timeout; | |
9ff05123 RK |
2585 | |
2586 | /* start sync. */ | |
2587 | sci->sc_task = current; | |
2588 | wake_up(&sci->sc_wait_task); /* for nilfs_segctor_start_thread() */ | |
2589 | printk(KERN_INFO | |
2590 | "segctord starting. Construction interval = %lu seconds, " | |
2591 | "CP frequency < %lu seconds\n", | |
2592 | sci->sc_interval / HZ, sci->sc_mjcp_freq / HZ); | |
2593 | ||
2594 | spin_lock(&sci->sc_state_lock); | |
2595 | loop: | |
2596 | for (;;) { | |
2597 | int mode; | |
2598 | ||
2599 | if (sci->sc_state & NILFS_SEGCTOR_QUIT) | |
2600 | goto end_thread; | |
2601 | ||
2602 | if (timeout || sci->sc_seq_request != sci->sc_seq_done) | |
2603 | mode = SC_LSEG_SR; | |
2604 | else if (!sci->sc_flush_request) | |
2605 | break; | |
2606 | else | |
2607 | mode = nilfs_segctor_flush_mode(sci); | |
2608 | ||
2609 | spin_unlock(&sci->sc_state_lock); | |
2610 | nilfs_segctor_thread_construct(sci, mode); | |
2611 | spin_lock(&sci->sc_state_lock); | |
2612 | timeout = 0; | |
2613 | } | |
2614 | ||
2615 | ||
2616 | if (freezing(current)) { | |
2617 | spin_unlock(&sci->sc_state_lock); | |
2618 | refrigerator(); | |
2619 | spin_lock(&sci->sc_state_lock); | |
2620 | } else { | |
2621 | DEFINE_WAIT(wait); | |
2622 | int should_sleep = 1; | |
2623 | ||
2624 | prepare_to_wait(&sci->sc_wait_daemon, &wait, | |
2625 | TASK_INTERRUPTIBLE); | |
2626 | ||
2627 | if (sci->sc_seq_request != sci->sc_seq_done) | |
2628 | should_sleep = 0; | |
2629 | else if (sci->sc_flush_request) | |
2630 | should_sleep = 0; | |
2631 | else if (sci->sc_state & NILFS_SEGCTOR_COMMIT) | |
2632 | should_sleep = time_before(jiffies, | |
fdce895e | 2633 | sci->sc_timer.expires); |
9ff05123 RK |
2634 | |
2635 | if (should_sleep) { | |
2636 | spin_unlock(&sci->sc_state_lock); | |
2637 | schedule(); | |
2638 | spin_lock(&sci->sc_state_lock); | |
2639 | } | |
2640 | finish_wait(&sci->sc_wait_daemon, &wait); | |
2641 | timeout = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) && | |
fdce895e | 2642 | time_after_eq(jiffies, sci->sc_timer.expires)); |
e605f0a7 RK |
2643 | |
2644 | if (nilfs_sb_dirty(nilfs) && nilfs_sb_need_update(nilfs)) | |
1dfa2710 | 2645 | set_nilfs_discontinued(nilfs); |
9ff05123 RK |
2646 | } |
2647 | goto loop; | |
2648 | ||
2649 | end_thread: | |
2650 | spin_unlock(&sci->sc_state_lock); | |
9ff05123 RK |
2651 | |
2652 | /* end sync. */ | |
2653 | sci->sc_task = NULL; | |
2654 | wake_up(&sci->sc_wait_task); /* for nilfs_segctor_kill_thread() */ | |
2655 | return 0; | |
2656 | } | |
2657 | ||
2658 | static int nilfs_segctor_start_thread(struct nilfs_sc_info *sci) | |
2659 | { | |
2660 | struct task_struct *t; | |
2661 | ||
2662 | t = kthread_run(nilfs_segctor_thread, sci, "segctord"); | |
2663 | if (IS_ERR(t)) { | |
2664 | int err = PTR_ERR(t); | |
2665 | ||
2666 | printk(KERN_ERR "NILFS: error %d creating segctord thread\n", | |
2667 | err); | |
2668 | return err; | |
2669 | } | |
2670 | wait_event(sci->sc_wait_task, sci->sc_task != NULL); | |
2671 | return 0; | |
2672 | } | |
2673 | ||
2674 | static void nilfs_segctor_kill_thread(struct nilfs_sc_info *sci) | |
2675 | { | |
2676 | sci->sc_state |= NILFS_SEGCTOR_QUIT; | |
2677 | ||
2678 | while (sci->sc_task) { | |
2679 | wake_up(&sci->sc_wait_daemon); | |
2680 | spin_unlock(&sci->sc_state_lock); | |
2681 | wait_event(sci->sc_wait_task, sci->sc_task == NULL); | |
2682 | spin_lock(&sci->sc_state_lock); | |
2683 | } | |
2684 | } | |
2685 | ||
9ff05123 RK |
2686 | /* |
2687 | * Setup & clean-up functions | |
2688 | */ | |
e912a5b6 RK |
2689 | static struct nilfs_sc_info *nilfs_segctor_new(struct nilfs_sb_info *sbi, |
2690 | struct nilfs_root *root) | |
9ff05123 RK |
2691 | { |
2692 | struct nilfs_sc_info *sci; | |
2693 | ||
2694 | sci = kzalloc(sizeof(*sci), GFP_KERNEL); | |
2695 | if (!sci) | |
2696 | return NULL; | |
2697 | ||
2698 | sci->sc_sbi = sbi; | |
2699 | sci->sc_super = sbi->s_super; | |
2700 | ||
e912a5b6 RK |
2701 | nilfs_get_root(root); |
2702 | sci->sc_root = root; | |
2703 | ||
9ff05123 RK |
2704 | init_waitqueue_head(&sci->sc_wait_request); |
2705 | init_waitqueue_head(&sci->sc_wait_daemon); | |
2706 | init_waitqueue_head(&sci->sc_wait_task); | |
2707 | spin_lock_init(&sci->sc_state_lock); | |
2708 | INIT_LIST_HEAD(&sci->sc_dirty_files); | |
2709 | INIT_LIST_HEAD(&sci->sc_segbufs); | |
a694291a | 2710 | INIT_LIST_HEAD(&sci->sc_write_logs); |
9ff05123 | 2711 | INIT_LIST_HEAD(&sci->sc_gc_inodes); |
9ff05123 | 2712 | INIT_LIST_HEAD(&sci->sc_copied_buffers); |
fdce895e | 2713 | init_timer(&sci->sc_timer); |
9ff05123 RK |
2714 | |
2715 | sci->sc_interval = HZ * NILFS_SC_DEFAULT_TIMEOUT; | |
2716 | sci->sc_mjcp_freq = HZ * NILFS_SC_DEFAULT_SR_FREQ; | |
2717 | sci->sc_watermark = NILFS_SC_DEFAULT_WATERMARK; | |
2718 | ||
2719 | if (sbi->s_interval) | |
2720 | sci->sc_interval = sbi->s_interval; | |
2721 | if (sbi->s_watermark) | |
2722 | sci->sc_watermark = sbi->s_watermark; | |
2723 | return sci; | |
2724 | } | |
2725 | ||
2726 | static void nilfs_segctor_write_out(struct nilfs_sc_info *sci) | |
2727 | { | |
2728 | int ret, retrycount = NILFS_SC_CLEANUP_RETRY; | |
2729 | ||
2730 | /* The segctord thread was stopped and its timer was removed. | |
2731 | But some tasks remain. */ | |
2732 | do { | |
2733 | struct nilfs_sb_info *sbi = sci->sc_sbi; | |
2734 | struct nilfs_transaction_info ti; | |
9ff05123 RK |
2735 | |
2736 | nilfs_transaction_lock(sbi, &ti, 0); | |
dcd76186 | 2737 | ret = nilfs_segctor_construct(sci, SC_LSEG_SR); |
9ff05123 RK |
2738 | nilfs_transaction_unlock(sbi); |
2739 | ||
2740 | } while (ret && retrycount-- > 0); | |
2741 | } | |
2742 | ||
2743 | /** | |
2744 | * nilfs_segctor_destroy - destroy the segment constructor. | |
2745 | * @sci: nilfs_sc_info | |
2746 | * | |
2747 | * nilfs_segctor_destroy() kills the segctord thread and frees | |
2748 | * the nilfs_sc_info struct. | |
2749 | * Caller must hold the segment semaphore. | |
2750 | */ | |
2751 | static void nilfs_segctor_destroy(struct nilfs_sc_info *sci) | |
2752 | { | |
2753 | struct nilfs_sb_info *sbi = sci->sc_sbi; | |
2754 | int flag; | |
2755 | ||
2756 | up_write(&sbi->s_nilfs->ns_segctor_sem); | |
2757 | ||
2758 | spin_lock(&sci->sc_state_lock); | |
2759 | nilfs_segctor_kill_thread(sci); | |
2760 | flag = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) || sci->sc_flush_request | |
2761 | || sci->sc_seq_request != sci->sc_seq_done); | |
2762 | spin_unlock(&sci->sc_state_lock); | |
2763 | ||
3256a055 | 2764 | if (flag || !nilfs_segctor_confirm(sci)) |
9ff05123 RK |
2765 | nilfs_segctor_write_out(sci); |
2766 | ||
1f5abe7e | 2767 | WARN_ON(!list_empty(&sci->sc_copied_buffers)); |
9ff05123 RK |
2768 | |
2769 | if (!list_empty(&sci->sc_dirty_files)) { | |
2770 | nilfs_warning(sbi->s_super, __func__, | |
2771 | "dirty file(s) after the final construction\n"); | |
2772 | nilfs_dispose_list(sbi, &sci->sc_dirty_files, 1); | |
2773 | } | |
9ff05123 | 2774 | |
1f5abe7e | 2775 | WARN_ON(!list_empty(&sci->sc_segbufs)); |
a694291a | 2776 | WARN_ON(!list_empty(&sci->sc_write_logs)); |
9ff05123 | 2777 | |
e912a5b6 RK |
2778 | nilfs_put_root(sci->sc_root); |
2779 | ||
9ff05123 RK |
2780 | down_write(&sbi->s_nilfs->ns_segctor_sem); |
2781 | ||
fdce895e | 2782 | del_timer_sync(&sci->sc_timer); |
9ff05123 RK |
2783 | kfree(sci); |
2784 | } | |
2785 | ||
2786 | /** | |
2787 | * nilfs_attach_segment_constructor - attach a segment constructor | |
2788 | * @sbi: nilfs_sb_info | |
e912a5b6 | 2789 | * @root: root object of the current filesystem tree |
9ff05123 RK |
2790 | * |
2791 | * nilfs_attach_segment_constructor() allocates a struct nilfs_sc_info, | |
7a65004b | 2792 | * initializes it, and starts the segment constructor. |
9ff05123 RK |
2793 | * |
2794 | * Return Value: On success, 0 is returned. On error, one of the following | |
2795 | * negative error code is returned. | |
2796 | * | |
2797 | * %-ENOMEM - Insufficient memory available. | |
2798 | */ | |
e912a5b6 RK |
2799 | int nilfs_attach_segment_constructor(struct nilfs_sb_info *sbi, |
2800 | struct nilfs_root *root) | |
9ff05123 | 2801 | { |
9ff05123 RK |
2802 | int err; |
2803 | ||
fe5f171b RK |
2804 | if (NILFS_SC(sbi)) { |
2805 | /* | |
2806 | * This happens if the filesystem was remounted | |
2807 | * read/write after nilfs_error degenerated it into a | |
2808 | * read-only mount. | |
2809 | */ | |
2810 | nilfs_detach_segment_constructor(sbi); | |
2811 | } | |
2812 | ||
e912a5b6 | 2813 | sbi->s_sc_info = nilfs_segctor_new(sbi, root); |
9ff05123 RK |
2814 | if (!sbi->s_sc_info) |
2815 | return -ENOMEM; | |
2816 | ||
154ac5a8 | 2817 | err = nilfs_segctor_start_thread(NILFS_SC(sbi)); |
9ff05123 | 2818 | if (err) { |
9ff05123 RK |
2819 | kfree(sbi->s_sc_info); |
2820 | sbi->s_sc_info = NULL; | |
2821 | } | |
2822 | return err; | |
2823 | } | |
2824 | ||
2825 | /** | |
2826 | * nilfs_detach_segment_constructor - destroy the segment constructor | |
2827 | * @sbi: nilfs_sb_info | |
2828 | * | |
2829 | * nilfs_detach_segment_constructor() kills the segment constructor daemon, | |
2830 | * frees the struct nilfs_sc_info, and destroy the dirty file list. | |
2831 | */ | |
2832 | void nilfs_detach_segment_constructor(struct nilfs_sb_info *sbi) | |
2833 | { | |
2834 | struct the_nilfs *nilfs = sbi->s_nilfs; | |
2835 | LIST_HEAD(garbage_list); | |
2836 | ||
2837 | down_write(&nilfs->ns_segctor_sem); | |
2838 | if (NILFS_SC(sbi)) { | |
2839 | nilfs_segctor_destroy(NILFS_SC(sbi)); | |
2840 | sbi->s_sc_info = NULL; | |
2841 | } | |
2842 | ||
2843 | /* Force to free the list of dirty files */ | |
2844 | spin_lock(&sbi->s_inode_lock); | |
2845 | if (!list_empty(&sbi->s_dirty_files)) { | |
2846 | list_splice_init(&sbi->s_dirty_files, &garbage_list); | |
2847 | nilfs_warning(sbi->s_super, __func__, | |
2848 | "Non empty dirty list after the last " | |
2849 | "segment construction\n"); | |
2850 | } | |
2851 | spin_unlock(&sbi->s_inode_lock); | |
2852 | up_write(&nilfs->ns_segctor_sem); | |
2853 | ||
2854 | nilfs_dispose_list(sbi, &garbage_list, 1); | |
9ff05123 | 2855 | } |