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ae98043f | 1 | // SPDX-License-Identifier: GPL-2.0+ |
9ff05123 RK |
2 | /* |
3 | * segment.c - NILFS segment constructor. | |
4 | * | |
5 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
6 | * | |
4b420ab4 | 7 | * Written by Ryusuke Konishi. |
9ff05123 RK |
8 | * |
9 | */ | |
10 | ||
11 | #include <linux/pagemap.h> | |
12 | #include <linux/buffer_head.h> | |
13 | #include <linux/writeback.h> | |
ead8ecff | 14 | #include <linux/bitops.h> |
9ff05123 RK |
15 | #include <linux/bio.h> |
16 | #include <linux/completion.h> | |
17 | #include <linux/blkdev.h> | |
18 | #include <linux/backing-dev.h> | |
19 | #include <linux/freezer.h> | |
20 | #include <linux/kthread.h> | |
21 | #include <linux/crc32.h> | |
22 | #include <linux/pagevec.h> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
174cd4b1 IM |
24 | #include <linux/sched/signal.h> |
25 | ||
9ff05123 RK |
26 | #include "nilfs.h" |
27 | #include "btnode.h" | |
28 | #include "page.h" | |
29 | #include "segment.h" | |
30 | #include "sufile.h" | |
31 | #include "cpfile.h" | |
32 | #include "ifile.h" | |
9ff05123 RK |
33 | #include "segbuf.h" |
34 | ||
35 | ||
36 | /* | |
37 | * Segment constructor | |
38 | */ | |
39 | #define SC_N_INODEVEC 16 /* Size of locally allocated inode vector */ | |
40 | ||
076a378b RK |
41 | #define SC_MAX_SEGDELTA 64 /* |
42 | * Upper limit of the number of segments | |
43 | * appended in collection retry loop | |
44 | */ | |
9ff05123 RK |
45 | |
46 | /* Construction mode */ | |
47 | enum { | |
48 | SC_LSEG_SR = 1, /* Make a logical segment having a super root */ | |
076a378b RK |
49 | SC_LSEG_DSYNC, /* |
50 | * Flush data blocks of a given file and make | |
51 | * a logical segment without a super root. | |
52 | */ | |
53 | SC_FLUSH_FILE, /* | |
54 | * Flush data files, leads to segment writes without | |
55 | * creating a checkpoint. | |
56 | */ | |
57 | SC_FLUSH_DAT, /* | |
58 | * Flush DAT file. This also creates segments | |
59 | * without a checkpoint. | |
60 | */ | |
9ff05123 RK |
61 | }; |
62 | ||
63 | /* Stage numbers of dirty block collection */ | |
64 | enum { | |
65 | NILFS_ST_INIT = 0, | |
66 | NILFS_ST_GC, /* Collecting dirty blocks for GC */ | |
67 | NILFS_ST_FILE, | |
9ff05123 RK |
68 | NILFS_ST_IFILE, |
69 | NILFS_ST_CPFILE, | |
70 | NILFS_ST_SUFILE, | |
71 | NILFS_ST_DAT, | |
72 | NILFS_ST_SR, /* Super root */ | |
73 | NILFS_ST_DSYNC, /* Data sync blocks */ | |
74 | NILFS_ST_DONE, | |
75 | }; | |
76 | ||
58497703 HM |
77 | #define CREATE_TRACE_POINTS |
78 | #include <trace/events/nilfs2.h> | |
79 | ||
80 | /* | |
81 | * nilfs_sc_cstage_inc(), nilfs_sc_cstage_set(), nilfs_sc_cstage_get() are | |
82 | * wrapper functions of stage count (nilfs_sc_info->sc_stage.scnt). Users of | |
83 | * the variable must use them because transition of stage count must involve | |
84 | * trace events (trace_nilfs2_collection_stage_transition). | |
85 | * | |
86 | * nilfs_sc_cstage_get() isn't required for the above purpose because it doesn't | |
87 | * produce tracepoint events. It is provided just for making the intention | |
88 | * clear. | |
89 | */ | |
90 | static inline void nilfs_sc_cstage_inc(struct nilfs_sc_info *sci) | |
91 | { | |
92 | sci->sc_stage.scnt++; | |
93 | trace_nilfs2_collection_stage_transition(sci); | |
94 | } | |
95 | ||
96 | static inline void nilfs_sc_cstage_set(struct nilfs_sc_info *sci, int next_scnt) | |
97 | { | |
98 | sci->sc_stage.scnt = next_scnt; | |
99 | trace_nilfs2_collection_stage_transition(sci); | |
100 | } | |
101 | ||
102 | static inline int nilfs_sc_cstage_get(struct nilfs_sc_info *sci) | |
103 | { | |
104 | return sci->sc_stage.scnt; | |
105 | } | |
106 | ||
9ff05123 RK |
107 | /* State flags of collection */ |
108 | #define NILFS_CF_NODE 0x0001 /* Collecting node blocks */ | |
109 | #define NILFS_CF_IFILE_STARTED 0x0002 /* IFILE stage has started */ | |
071cb4b8 RK |
110 | #define NILFS_CF_SUFREED 0x0004 /* segment usages has been freed */ |
111 | #define NILFS_CF_HISTORY_MASK (NILFS_CF_IFILE_STARTED | NILFS_CF_SUFREED) | |
9ff05123 RK |
112 | |
113 | /* Operations depending on the construction mode and file type */ | |
114 | struct nilfs_sc_operations { | |
115 | int (*collect_data)(struct nilfs_sc_info *, struct buffer_head *, | |
116 | struct inode *); | |
117 | int (*collect_node)(struct nilfs_sc_info *, struct buffer_head *, | |
118 | struct inode *); | |
119 | int (*collect_bmap)(struct nilfs_sc_info *, struct buffer_head *, | |
120 | struct inode *); | |
121 | void (*write_data_binfo)(struct nilfs_sc_info *, | |
122 | struct nilfs_segsum_pointer *, | |
123 | union nilfs_binfo *); | |
124 | void (*write_node_binfo)(struct nilfs_sc_info *, | |
125 | struct nilfs_segsum_pointer *, | |
126 | union nilfs_binfo *); | |
127 | }; | |
128 | ||
129 | /* | |
130 | * Other definitions | |
131 | */ | |
132 | static void nilfs_segctor_start_timer(struct nilfs_sc_info *); | |
133 | static void nilfs_segctor_do_flush(struct nilfs_sc_info *, int); | |
134 | static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *); | |
693dd321 | 135 | static void nilfs_dispose_list(struct the_nilfs *, struct list_head *, int); |
9ff05123 RK |
136 | |
137 | #define nilfs_cnt32_gt(a, b) \ | |
138 | (typecheck(__u32, a) && typecheck(__u32, b) && \ | |
139 | ((__s32)(b) - (__s32)(a) < 0)) | |
140 | #define nilfs_cnt32_ge(a, b) \ | |
141 | (typecheck(__u32, a) && typecheck(__u32, b) && \ | |
142 | ((__s32)(a) - (__s32)(b) >= 0)) | |
143 | #define nilfs_cnt32_lt(a, b) nilfs_cnt32_gt(b, a) | |
144 | #define nilfs_cnt32_le(a, b) nilfs_cnt32_ge(b, a) | |
145 | ||
feee880f RK |
146 | static int nilfs_prepare_segment_lock(struct super_block *sb, |
147 | struct nilfs_transaction_info *ti) | |
9ff05123 RK |
148 | { |
149 | struct nilfs_transaction_info *cur_ti = current->journal_info; | |
150 | void *save = NULL; | |
151 | ||
152 | if (cur_ti) { | |
153 | if (cur_ti->ti_magic == NILFS_TI_MAGIC) | |
154 | return ++cur_ti->ti_count; | |
7f00184e RK |
155 | |
156 | /* | |
157 | * If journal_info field is occupied by other FS, | |
158 | * it is saved and will be restored on | |
159 | * nilfs_transaction_commit(). | |
160 | */ | |
feee880f | 161 | nilfs_msg(sb, KERN_WARNING, "journal info from a different FS"); |
7f00184e | 162 | save = current->journal_info; |
9ff05123 RK |
163 | } |
164 | if (!ti) { | |
165 | ti = kmem_cache_alloc(nilfs_transaction_cachep, GFP_NOFS); | |
166 | if (!ti) | |
167 | return -ENOMEM; | |
168 | ti->ti_flags = NILFS_TI_DYNAMIC_ALLOC; | |
169 | } else { | |
170 | ti->ti_flags = 0; | |
171 | } | |
172 | ti->ti_count = 0; | |
173 | ti->ti_save = save; | |
174 | ti->ti_magic = NILFS_TI_MAGIC; | |
175 | current->journal_info = ti; | |
176 | return 0; | |
177 | } | |
178 | ||
179 | /** | |
180 | * nilfs_transaction_begin - start indivisible file operations. | |
181 | * @sb: super block | |
182 | * @ti: nilfs_transaction_info | |
183 | * @vacancy_check: flags for vacancy rate checks | |
184 | * | |
185 | * nilfs_transaction_begin() acquires a reader/writer semaphore, called | |
186 | * the segment semaphore, to make a segment construction and write tasks | |
47420c79 | 187 | * exclusive. The function is used with nilfs_transaction_commit() in pairs. |
9ff05123 RK |
188 | * The region enclosed by these two functions can be nested. To avoid a |
189 | * deadlock, the semaphore is only acquired or released in the outermost call. | |
190 | * | |
191 | * This function allocates a nilfs_transaction_info struct to keep context | |
192 | * information on it. It is initialized and hooked onto the current task in | |
193 | * the outermost call. If a pre-allocated struct is given to @ti, it is used | |
7a65004b | 194 | * instead; otherwise a new struct is assigned from a slab. |
9ff05123 RK |
195 | * |
196 | * When @vacancy_check flag is set, this function will check the amount of | |
197 | * free space, and will wait for the GC to reclaim disk space if low capacity. | |
198 | * | |
199 | * Return Value: On success, 0 is returned. On error, one of the following | |
200 | * negative error code is returned. | |
201 | * | |
202 | * %-ENOMEM - Insufficient memory available. | |
203 | * | |
9ff05123 RK |
204 | * %-ENOSPC - No space left on device |
205 | */ | |
206 | int nilfs_transaction_begin(struct super_block *sb, | |
207 | struct nilfs_transaction_info *ti, | |
208 | int vacancy_check) | |
209 | { | |
9ff05123 | 210 | struct the_nilfs *nilfs; |
feee880f | 211 | int ret = nilfs_prepare_segment_lock(sb, ti); |
44fda114 | 212 | struct nilfs_transaction_info *trace_ti; |
9ff05123 RK |
213 | |
214 | if (unlikely(ret < 0)) | |
215 | return ret; | |
44fda114 HM |
216 | if (ret > 0) { |
217 | trace_ti = current->journal_info; | |
218 | ||
219 | trace_nilfs2_transaction_transition(sb, trace_ti, | |
220 | trace_ti->ti_count, trace_ti->ti_flags, | |
221 | TRACE_NILFS2_TRANSACTION_BEGIN); | |
9ff05123 | 222 | return 0; |
44fda114 | 223 | } |
9ff05123 | 224 | |
2c22b337 | 225 | sb_start_intwrite(sb); |
5beb6e0b | 226 | |
e3154e97 | 227 | nilfs = sb->s_fs_info; |
9ff05123 RK |
228 | down_read(&nilfs->ns_segctor_sem); |
229 | if (vacancy_check && nilfs_near_disk_full(nilfs)) { | |
230 | up_read(&nilfs->ns_segctor_sem); | |
231 | ret = -ENOSPC; | |
232 | goto failed; | |
233 | } | |
44fda114 HM |
234 | |
235 | trace_ti = current->journal_info; | |
236 | trace_nilfs2_transaction_transition(sb, trace_ti, trace_ti->ti_count, | |
237 | trace_ti->ti_flags, | |
238 | TRACE_NILFS2_TRANSACTION_BEGIN); | |
9ff05123 RK |
239 | return 0; |
240 | ||
241 | failed: | |
242 | ti = current->journal_info; | |
243 | current->journal_info = ti->ti_save; | |
244 | if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC) | |
245 | kmem_cache_free(nilfs_transaction_cachep, ti); | |
2c22b337 | 246 | sb_end_intwrite(sb); |
9ff05123 RK |
247 | return ret; |
248 | } | |
249 | ||
250 | /** | |
47420c79 | 251 | * nilfs_transaction_commit - commit indivisible file operations. |
9ff05123 | 252 | * @sb: super block |
9ff05123 | 253 | * |
47420c79 RK |
254 | * nilfs_transaction_commit() releases the read semaphore which is |
255 | * acquired by nilfs_transaction_begin(). This is only performed | |
256 | * in outermost call of this function. If a commit flag is set, | |
257 | * nilfs_transaction_commit() sets a timer to start the segment | |
258 | * constructor. If a sync flag is set, it starts construction | |
259 | * directly. | |
9ff05123 | 260 | */ |
47420c79 | 261 | int nilfs_transaction_commit(struct super_block *sb) |
9ff05123 RK |
262 | { |
263 | struct nilfs_transaction_info *ti = current->journal_info; | |
e3154e97 | 264 | struct the_nilfs *nilfs = sb->s_fs_info; |
9ff05123 RK |
265 | int err = 0; |
266 | ||
267 | BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC); | |
47420c79 | 268 | ti->ti_flags |= NILFS_TI_COMMIT; |
9ff05123 RK |
269 | if (ti->ti_count > 0) { |
270 | ti->ti_count--; | |
44fda114 HM |
271 | trace_nilfs2_transaction_transition(sb, ti, ti->ti_count, |
272 | ti->ti_flags, TRACE_NILFS2_TRANSACTION_COMMIT); | |
9ff05123 RK |
273 | return 0; |
274 | } | |
3fd3fe5a RK |
275 | if (nilfs->ns_writer) { |
276 | struct nilfs_sc_info *sci = nilfs->ns_writer; | |
277 | ||
9ff05123 RK |
278 | if (ti->ti_flags & NILFS_TI_COMMIT) |
279 | nilfs_segctor_start_timer(sci); | |
3fd3fe5a | 280 | if (atomic_read(&nilfs->ns_ndirtyblks) > sci->sc_watermark) |
9ff05123 RK |
281 | nilfs_segctor_do_flush(sci, 0); |
282 | } | |
3fd3fe5a | 283 | up_read(&nilfs->ns_segctor_sem); |
44fda114 HM |
284 | trace_nilfs2_transaction_transition(sb, ti, ti->ti_count, |
285 | ti->ti_flags, TRACE_NILFS2_TRANSACTION_COMMIT); | |
286 | ||
9ff05123 RK |
287 | current->journal_info = ti->ti_save; |
288 | ||
289 | if (ti->ti_flags & NILFS_TI_SYNC) | |
290 | err = nilfs_construct_segment(sb); | |
291 | if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC) | |
292 | kmem_cache_free(nilfs_transaction_cachep, ti); | |
2c22b337 | 293 | sb_end_intwrite(sb); |
9ff05123 RK |
294 | return err; |
295 | } | |
296 | ||
47420c79 RK |
297 | void nilfs_transaction_abort(struct super_block *sb) |
298 | { | |
299 | struct nilfs_transaction_info *ti = current->journal_info; | |
e3154e97 | 300 | struct the_nilfs *nilfs = sb->s_fs_info; |
47420c79 RK |
301 | |
302 | BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC); | |
303 | if (ti->ti_count > 0) { | |
304 | ti->ti_count--; | |
44fda114 HM |
305 | trace_nilfs2_transaction_transition(sb, ti, ti->ti_count, |
306 | ti->ti_flags, TRACE_NILFS2_TRANSACTION_ABORT); | |
47420c79 RK |
307 | return; |
308 | } | |
e3154e97 | 309 | up_read(&nilfs->ns_segctor_sem); |
47420c79 | 310 | |
44fda114 HM |
311 | trace_nilfs2_transaction_transition(sb, ti, ti->ti_count, |
312 | ti->ti_flags, TRACE_NILFS2_TRANSACTION_ABORT); | |
313 | ||
47420c79 RK |
314 | current->journal_info = ti->ti_save; |
315 | if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC) | |
316 | kmem_cache_free(nilfs_transaction_cachep, ti); | |
2c22b337 | 317 | sb_end_intwrite(sb); |
47420c79 RK |
318 | } |
319 | ||
9ff05123 RK |
320 | void nilfs_relax_pressure_in_lock(struct super_block *sb) |
321 | { | |
e3154e97 | 322 | struct the_nilfs *nilfs = sb->s_fs_info; |
3fd3fe5a | 323 | struct nilfs_sc_info *sci = nilfs->ns_writer; |
9ff05123 RK |
324 | |
325 | if (!sci || !sci->sc_flush_request) | |
326 | return; | |
327 | ||
328 | set_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags); | |
329 | up_read(&nilfs->ns_segctor_sem); | |
330 | ||
331 | down_write(&nilfs->ns_segctor_sem); | |
332 | if (sci->sc_flush_request && | |
333 | test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags)) { | |
334 | struct nilfs_transaction_info *ti = current->journal_info; | |
335 | ||
336 | ti->ti_flags |= NILFS_TI_WRITER; | |
337 | nilfs_segctor_do_immediate_flush(sci); | |
338 | ti->ti_flags &= ~NILFS_TI_WRITER; | |
339 | } | |
340 | downgrade_write(&nilfs->ns_segctor_sem); | |
341 | } | |
342 | ||
f7545144 | 343 | static void nilfs_transaction_lock(struct super_block *sb, |
9ff05123 RK |
344 | struct nilfs_transaction_info *ti, |
345 | int gcflag) | |
346 | { | |
347 | struct nilfs_transaction_info *cur_ti = current->journal_info; | |
e3154e97 | 348 | struct the_nilfs *nilfs = sb->s_fs_info; |
3fd3fe5a | 349 | struct nilfs_sc_info *sci = nilfs->ns_writer; |
9ff05123 | 350 | |
1f5abe7e | 351 | WARN_ON(cur_ti); |
9ff05123 RK |
352 | ti->ti_flags = NILFS_TI_WRITER; |
353 | ti->ti_count = 0; | |
354 | ti->ti_save = cur_ti; | |
355 | ti->ti_magic = NILFS_TI_MAGIC; | |
9ff05123 RK |
356 | current->journal_info = ti; |
357 | ||
358 | for (;;) { | |
44fda114 HM |
359 | trace_nilfs2_transaction_transition(sb, ti, ti->ti_count, |
360 | ti->ti_flags, TRACE_NILFS2_TRANSACTION_TRYLOCK); | |
361 | ||
3fd3fe5a RK |
362 | down_write(&nilfs->ns_segctor_sem); |
363 | if (!test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags)) | |
9ff05123 RK |
364 | break; |
365 | ||
3fd3fe5a | 366 | nilfs_segctor_do_immediate_flush(sci); |
9ff05123 | 367 | |
f7545144 | 368 | up_write(&nilfs->ns_segctor_sem); |
aceb4170 | 369 | cond_resched(); |
9ff05123 RK |
370 | } |
371 | if (gcflag) | |
372 | ti->ti_flags |= NILFS_TI_GC; | |
44fda114 HM |
373 | |
374 | trace_nilfs2_transaction_transition(sb, ti, ti->ti_count, | |
375 | ti->ti_flags, TRACE_NILFS2_TRANSACTION_LOCK); | |
9ff05123 RK |
376 | } |
377 | ||
f7545144 | 378 | static void nilfs_transaction_unlock(struct super_block *sb) |
9ff05123 RK |
379 | { |
380 | struct nilfs_transaction_info *ti = current->journal_info; | |
e3154e97 | 381 | struct the_nilfs *nilfs = sb->s_fs_info; |
9ff05123 RK |
382 | |
383 | BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC); | |
384 | BUG_ON(ti->ti_count > 0); | |
385 | ||
693dd321 | 386 | up_write(&nilfs->ns_segctor_sem); |
9ff05123 | 387 | current->journal_info = ti->ti_save; |
44fda114 HM |
388 | |
389 | trace_nilfs2_transaction_transition(sb, ti, ti->ti_count, | |
390 | ti->ti_flags, TRACE_NILFS2_TRANSACTION_UNLOCK); | |
9ff05123 RK |
391 | } |
392 | ||
393 | static void *nilfs_segctor_map_segsum_entry(struct nilfs_sc_info *sci, | |
394 | struct nilfs_segsum_pointer *ssp, | |
0c6c44cb | 395 | unsigned int bytes) |
9ff05123 RK |
396 | { |
397 | struct nilfs_segment_buffer *segbuf = sci->sc_curseg; | |
0c6c44cb | 398 | unsigned int blocksize = sci->sc_super->s_blocksize; |
9ff05123 RK |
399 | void *p; |
400 | ||
401 | if (unlikely(ssp->offset + bytes > blocksize)) { | |
402 | ssp->offset = 0; | |
403 | BUG_ON(NILFS_SEGBUF_BH_IS_LAST(ssp->bh, | |
404 | &segbuf->sb_segsum_buffers)); | |
405 | ssp->bh = NILFS_SEGBUF_NEXT_BH(ssp->bh); | |
406 | } | |
407 | p = ssp->bh->b_data + ssp->offset; | |
408 | ssp->offset += bytes; | |
409 | return p; | |
410 | } | |
411 | ||
412 | /** | |
413 | * nilfs_segctor_reset_segment_buffer - reset the current segment buffer | |
414 | * @sci: nilfs_sc_info | |
415 | */ | |
416 | static int nilfs_segctor_reset_segment_buffer(struct nilfs_sc_info *sci) | |
417 | { | |
418 | struct nilfs_segment_buffer *segbuf = sci->sc_curseg; | |
419 | struct buffer_head *sumbh; | |
0c6c44cb RK |
420 | unsigned int sumbytes; |
421 | unsigned int flags = 0; | |
9ff05123 RK |
422 | int err; |
423 | ||
424 | if (nilfs_doing_gc()) | |
425 | flags = NILFS_SS_GC; | |
6c43f410 | 426 | err = nilfs_segbuf_reset(segbuf, flags, sci->sc_seg_ctime, sci->sc_cno); |
9ff05123 RK |
427 | if (unlikely(err)) |
428 | return err; | |
429 | ||
430 | sumbh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers); | |
431 | sumbytes = segbuf->sb_sum.sumbytes; | |
432 | sci->sc_finfo_ptr.bh = sumbh; sci->sc_finfo_ptr.offset = sumbytes; | |
433 | sci->sc_binfo_ptr.bh = sumbh; sci->sc_binfo_ptr.offset = sumbytes; | |
434 | sci->sc_blk_cnt = sci->sc_datablk_cnt = 0; | |
435 | return 0; | |
436 | } | |
437 | ||
438 | static int nilfs_segctor_feed_segment(struct nilfs_sc_info *sci) | |
439 | { | |
440 | sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks; | |
441 | if (NILFS_SEGBUF_IS_LAST(sci->sc_curseg, &sci->sc_segbufs)) | |
076a378b RK |
442 | return -E2BIG; /* |
443 | * The current segment is filled up | |
444 | * (internal code) | |
445 | */ | |
9ff05123 RK |
446 | sci->sc_curseg = NILFS_NEXT_SEGBUF(sci->sc_curseg); |
447 | return nilfs_segctor_reset_segment_buffer(sci); | |
448 | } | |
449 | ||
450 | static int nilfs_segctor_add_super_root(struct nilfs_sc_info *sci) | |
451 | { | |
452 | struct nilfs_segment_buffer *segbuf = sci->sc_curseg; | |
453 | int err; | |
454 | ||
455 | if (segbuf->sb_sum.nblocks >= segbuf->sb_rest_blocks) { | |
456 | err = nilfs_segctor_feed_segment(sci); | |
457 | if (err) | |
458 | return err; | |
459 | segbuf = sci->sc_curseg; | |
460 | } | |
1e2b68bf | 461 | err = nilfs_segbuf_extend_payload(segbuf, &segbuf->sb_super_root); |
9ff05123 RK |
462 | if (likely(!err)) |
463 | segbuf->sb_sum.flags |= NILFS_SS_SR; | |
464 | return err; | |
465 | } | |
466 | ||
467 | /* | |
468 | * Functions for making segment summary and payloads | |
469 | */ | |
470 | static int nilfs_segctor_segsum_block_required( | |
471 | struct nilfs_sc_info *sci, const struct nilfs_segsum_pointer *ssp, | |
0c6c44cb | 472 | unsigned int binfo_size) |
9ff05123 | 473 | { |
0c6c44cb | 474 | unsigned int blocksize = sci->sc_super->s_blocksize; |
9ff05123 RK |
475 | /* Size of finfo and binfo is enough small against blocksize */ |
476 | ||
477 | return ssp->offset + binfo_size + | |
478 | (!sci->sc_blk_cnt ? sizeof(struct nilfs_finfo) : 0) > | |
479 | blocksize; | |
480 | } | |
481 | ||
482 | static void nilfs_segctor_begin_finfo(struct nilfs_sc_info *sci, | |
483 | struct inode *inode) | |
484 | { | |
485 | sci->sc_curseg->sb_sum.nfinfo++; | |
486 | sci->sc_binfo_ptr = sci->sc_finfo_ptr; | |
487 | nilfs_segctor_map_segsum_entry( | |
488 | sci, &sci->sc_binfo_ptr, sizeof(struct nilfs_finfo)); | |
c96fa464 | 489 | |
72746ac6 RK |
490 | if (NILFS_I(inode)->i_root && |
491 | !test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags)) | |
c96fa464 | 492 | set_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags); |
9ff05123 RK |
493 | /* skip finfo */ |
494 | } | |
495 | ||
496 | static void nilfs_segctor_end_finfo(struct nilfs_sc_info *sci, | |
497 | struct inode *inode) | |
498 | { | |
499 | struct nilfs_finfo *finfo; | |
500 | struct nilfs_inode_info *ii; | |
501 | struct nilfs_segment_buffer *segbuf; | |
6c43f410 | 502 | __u64 cno; |
9ff05123 RK |
503 | |
504 | if (sci->sc_blk_cnt == 0) | |
505 | return; | |
506 | ||
507 | ii = NILFS_I(inode); | |
6c43f410 RK |
508 | |
509 | if (test_bit(NILFS_I_GCINODE, &ii->i_state)) | |
510 | cno = ii->i_cno; | |
511 | else if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) | |
512 | cno = 0; | |
513 | else | |
514 | cno = sci->sc_cno; | |
515 | ||
9ff05123 RK |
516 | finfo = nilfs_segctor_map_segsum_entry(sci, &sci->sc_finfo_ptr, |
517 | sizeof(*finfo)); | |
518 | finfo->fi_ino = cpu_to_le64(inode->i_ino); | |
519 | finfo->fi_nblocks = cpu_to_le32(sci->sc_blk_cnt); | |
520 | finfo->fi_ndatablk = cpu_to_le32(sci->sc_datablk_cnt); | |
6c43f410 | 521 | finfo->fi_cno = cpu_to_le64(cno); |
9ff05123 RK |
522 | |
523 | segbuf = sci->sc_curseg; | |
524 | segbuf->sb_sum.sumbytes = sci->sc_binfo_ptr.offset + | |
525 | sci->sc_super->s_blocksize * (segbuf->sb_sum.nsumblk - 1); | |
526 | sci->sc_finfo_ptr = sci->sc_binfo_ptr; | |
527 | sci->sc_blk_cnt = sci->sc_datablk_cnt = 0; | |
528 | } | |
529 | ||
530 | static int nilfs_segctor_add_file_block(struct nilfs_sc_info *sci, | |
531 | struct buffer_head *bh, | |
532 | struct inode *inode, | |
0c6c44cb | 533 | unsigned int binfo_size) |
9ff05123 RK |
534 | { |
535 | struct nilfs_segment_buffer *segbuf; | |
536 | int required, err = 0; | |
537 | ||
538 | retry: | |
539 | segbuf = sci->sc_curseg; | |
540 | required = nilfs_segctor_segsum_block_required( | |
541 | sci, &sci->sc_binfo_ptr, binfo_size); | |
542 | if (segbuf->sb_sum.nblocks + required + 1 > segbuf->sb_rest_blocks) { | |
543 | nilfs_segctor_end_finfo(sci, inode); | |
544 | err = nilfs_segctor_feed_segment(sci); | |
545 | if (err) | |
546 | return err; | |
547 | goto retry; | |
548 | } | |
549 | if (unlikely(required)) { | |
550 | err = nilfs_segbuf_extend_segsum(segbuf); | |
551 | if (unlikely(err)) | |
552 | goto failed; | |
553 | } | |
554 | if (sci->sc_blk_cnt == 0) | |
555 | nilfs_segctor_begin_finfo(sci, inode); | |
556 | ||
557 | nilfs_segctor_map_segsum_entry(sci, &sci->sc_binfo_ptr, binfo_size); | |
558 | /* Substitution to vblocknr is delayed until update_blocknr() */ | |
559 | nilfs_segbuf_add_file_buffer(segbuf, bh); | |
560 | sci->sc_blk_cnt++; | |
561 | failed: | |
562 | return err; | |
563 | } | |
564 | ||
9ff05123 RK |
565 | /* |
566 | * Callback functions that enumerate, mark, and collect dirty blocks | |
567 | */ | |
568 | static int nilfs_collect_file_data(struct nilfs_sc_info *sci, | |
569 | struct buffer_head *bh, struct inode *inode) | |
570 | { | |
571 | int err; | |
572 | ||
9ff05123 | 573 | err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh); |
e828949e RK |
574 | if (err < 0) |
575 | return err; | |
9ff05123 RK |
576 | |
577 | err = nilfs_segctor_add_file_block(sci, bh, inode, | |
578 | sizeof(struct nilfs_binfo_v)); | |
579 | if (!err) | |
580 | sci->sc_datablk_cnt++; | |
581 | return err; | |
582 | } | |
583 | ||
584 | static int nilfs_collect_file_node(struct nilfs_sc_info *sci, | |
585 | struct buffer_head *bh, | |
586 | struct inode *inode) | |
587 | { | |
e828949e | 588 | return nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh); |
9ff05123 RK |
589 | } |
590 | ||
591 | static int nilfs_collect_file_bmap(struct nilfs_sc_info *sci, | |
592 | struct buffer_head *bh, | |
593 | struct inode *inode) | |
594 | { | |
1f5abe7e | 595 | WARN_ON(!buffer_dirty(bh)); |
9ff05123 RK |
596 | return nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64)); |
597 | } | |
598 | ||
599 | static void nilfs_write_file_data_binfo(struct nilfs_sc_info *sci, | |
600 | struct nilfs_segsum_pointer *ssp, | |
601 | union nilfs_binfo *binfo) | |
602 | { | |
603 | struct nilfs_binfo_v *binfo_v = nilfs_segctor_map_segsum_entry( | |
604 | sci, ssp, sizeof(*binfo_v)); | |
605 | *binfo_v = binfo->bi_v; | |
606 | } | |
607 | ||
608 | static void nilfs_write_file_node_binfo(struct nilfs_sc_info *sci, | |
609 | struct nilfs_segsum_pointer *ssp, | |
610 | union nilfs_binfo *binfo) | |
611 | { | |
612 | __le64 *vblocknr = nilfs_segctor_map_segsum_entry( | |
613 | sci, ssp, sizeof(*vblocknr)); | |
614 | *vblocknr = binfo->bi_v.bi_vblocknr; | |
615 | } | |
616 | ||
1c613cb9 | 617 | static const struct nilfs_sc_operations nilfs_sc_file_ops = { |
9ff05123 RK |
618 | .collect_data = nilfs_collect_file_data, |
619 | .collect_node = nilfs_collect_file_node, | |
620 | .collect_bmap = nilfs_collect_file_bmap, | |
621 | .write_data_binfo = nilfs_write_file_data_binfo, | |
622 | .write_node_binfo = nilfs_write_file_node_binfo, | |
623 | }; | |
624 | ||
625 | static int nilfs_collect_dat_data(struct nilfs_sc_info *sci, | |
626 | struct buffer_head *bh, struct inode *inode) | |
627 | { | |
628 | int err; | |
629 | ||
630 | err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh); | |
e828949e RK |
631 | if (err < 0) |
632 | return err; | |
9ff05123 RK |
633 | |
634 | err = nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64)); | |
635 | if (!err) | |
636 | sci->sc_datablk_cnt++; | |
637 | return err; | |
638 | } | |
639 | ||
640 | static int nilfs_collect_dat_bmap(struct nilfs_sc_info *sci, | |
641 | struct buffer_head *bh, struct inode *inode) | |
642 | { | |
1f5abe7e | 643 | WARN_ON(!buffer_dirty(bh)); |
9ff05123 RK |
644 | return nilfs_segctor_add_file_block(sci, bh, inode, |
645 | sizeof(struct nilfs_binfo_dat)); | |
646 | } | |
647 | ||
648 | static void nilfs_write_dat_data_binfo(struct nilfs_sc_info *sci, | |
649 | struct nilfs_segsum_pointer *ssp, | |
650 | union nilfs_binfo *binfo) | |
651 | { | |
652 | __le64 *blkoff = nilfs_segctor_map_segsum_entry(sci, ssp, | |
653 | sizeof(*blkoff)); | |
654 | *blkoff = binfo->bi_dat.bi_blkoff; | |
655 | } | |
656 | ||
657 | static void nilfs_write_dat_node_binfo(struct nilfs_sc_info *sci, | |
658 | struct nilfs_segsum_pointer *ssp, | |
659 | union nilfs_binfo *binfo) | |
660 | { | |
661 | struct nilfs_binfo_dat *binfo_dat = | |
662 | nilfs_segctor_map_segsum_entry(sci, ssp, sizeof(*binfo_dat)); | |
663 | *binfo_dat = binfo->bi_dat; | |
664 | } | |
665 | ||
1c613cb9 | 666 | static const struct nilfs_sc_operations nilfs_sc_dat_ops = { |
9ff05123 RK |
667 | .collect_data = nilfs_collect_dat_data, |
668 | .collect_node = nilfs_collect_file_node, | |
669 | .collect_bmap = nilfs_collect_dat_bmap, | |
670 | .write_data_binfo = nilfs_write_dat_data_binfo, | |
671 | .write_node_binfo = nilfs_write_dat_node_binfo, | |
672 | }; | |
673 | ||
1c613cb9 | 674 | static const struct nilfs_sc_operations nilfs_sc_dsync_ops = { |
9ff05123 RK |
675 | .collect_data = nilfs_collect_file_data, |
676 | .collect_node = NULL, | |
677 | .collect_bmap = NULL, | |
678 | .write_data_binfo = nilfs_write_file_data_binfo, | |
679 | .write_node_binfo = NULL, | |
680 | }; | |
681 | ||
f30bf3e4 RK |
682 | static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode, |
683 | struct list_head *listp, | |
684 | size_t nlimit, | |
685 | loff_t start, loff_t end) | |
9ff05123 | 686 | { |
9ff05123 RK |
687 | struct address_space *mapping = inode->i_mapping; |
688 | struct pagevec pvec; | |
f30bf3e4 RK |
689 | pgoff_t index = 0, last = ULONG_MAX; |
690 | size_t ndirties = 0; | |
691 | int i; | |
9ff05123 | 692 | |
f30bf3e4 RK |
693 | if (unlikely(start != 0 || end != LLONG_MAX)) { |
694 | /* | |
695 | * A valid range is given for sync-ing data pages. The | |
696 | * range is rounded to per-page; extra dirty buffers | |
697 | * may be included if blocksize < pagesize. | |
698 | */ | |
699 | index = start >> PAGE_SHIFT; | |
700 | last = end >> PAGE_SHIFT; | |
701 | } | |
86679820 | 702 | pagevec_init(&pvec); |
9ff05123 | 703 | repeat: |
f30bf3e4 | 704 | if (unlikely(index > last) || |
40f9c513 | 705 | !pagevec_lookup_range_tag(&pvec, mapping, &index, last, |
67fd707f | 706 | PAGECACHE_TAG_DIRTY)) |
f30bf3e4 | 707 | return ndirties; |
9ff05123 RK |
708 | |
709 | for (i = 0; i < pagevec_count(&pvec); i++) { | |
710 | struct buffer_head *bh, *head; | |
711 | struct page *page = pvec.pages[i]; | |
712 | ||
aa405b1f RK |
713 | lock_page(page); |
714 | if (!page_has_buffers(page)) | |
93407472 | 715 | create_empty_buffers(page, i_blocksize(inode), 0); |
aa405b1f | 716 | unlock_page(page); |
9ff05123 RK |
717 | |
718 | bh = head = page_buffers(page); | |
719 | do { | |
7f42ec39 | 720 | if (!buffer_dirty(bh) || buffer_async_write(bh)) |
f30bf3e4 RK |
721 | continue; |
722 | get_bh(bh); | |
723 | list_add_tail(&bh->b_assoc_buffers, listp); | |
724 | ndirties++; | |
725 | if (unlikely(ndirties >= nlimit)) { | |
726 | pagevec_release(&pvec); | |
727 | cond_resched(); | |
728 | return ndirties; | |
9ff05123 | 729 | } |
f30bf3e4 | 730 | } while (bh = bh->b_this_page, bh != head); |
9ff05123 RK |
731 | } |
732 | pagevec_release(&pvec); | |
733 | cond_resched(); | |
f30bf3e4 | 734 | goto repeat; |
9ff05123 RK |
735 | } |
736 | ||
737 | static void nilfs_lookup_dirty_node_buffers(struct inode *inode, | |
738 | struct list_head *listp) | |
739 | { | |
740 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
741 | struct address_space *mapping = &ii->i_btnode_cache; | |
742 | struct pagevec pvec; | |
743 | struct buffer_head *bh, *head; | |
744 | unsigned int i; | |
745 | pgoff_t index = 0; | |
746 | ||
86679820 | 747 | pagevec_init(&pvec); |
9ff05123 | 748 | |
67fd707f JK |
749 | while (pagevec_lookup_tag(&pvec, mapping, &index, |
750 | PAGECACHE_TAG_DIRTY)) { | |
9ff05123 RK |
751 | for (i = 0; i < pagevec_count(&pvec); i++) { |
752 | bh = head = page_buffers(pvec.pages[i]); | |
753 | do { | |
7f42ec39 VD |
754 | if (buffer_dirty(bh) && |
755 | !buffer_async_write(bh)) { | |
9ff05123 RK |
756 | get_bh(bh); |
757 | list_add_tail(&bh->b_assoc_buffers, | |
758 | listp); | |
759 | } | |
760 | bh = bh->b_this_page; | |
761 | } while (bh != head); | |
762 | } | |
763 | pagevec_release(&pvec); | |
764 | cond_resched(); | |
765 | } | |
766 | } | |
767 | ||
693dd321 | 768 | static void nilfs_dispose_list(struct the_nilfs *nilfs, |
9ff05123 RK |
769 | struct list_head *head, int force) |
770 | { | |
771 | struct nilfs_inode_info *ii, *n; | |
772 | struct nilfs_inode_info *ivec[SC_N_INODEVEC], **pii; | |
0c6c44cb | 773 | unsigned int nv = 0; |
9ff05123 RK |
774 | |
775 | while (!list_empty(head)) { | |
693dd321 | 776 | spin_lock(&nilfs->ns_inode_lock); |
9ff05123 RK |
777 | list_for_each_entry_safe(ii, n, head, i_dirty) { |
778 | list_del_init(&ii->i_dirty); | |
779 | if (force) { | |
780 | if (unlikely(ii->i_bh)) { | |
781 | brelse(ii->i_bh); | |
782 | ii->i_bh = NULL; | |
783 | } | |
784 | } else if (test_bit(NILFS_I_DIRTY, &ii->i_state)) { | |
785 | set_bit(NILFS_I_QUEUED, &ii->i_state); | |
786 | list_add_tail(&ii->i_dirty, | |
693dd321 | 787 | &nilfs->ns_dirty_files); |
9ff05123 RK |
788 | continue; |
789 | } | |
790 | ivec[nv++] = ii; | |
791 | if (nv == SC_N_INODEVEC) | |
792 | break; | |
793 | } | |
693dd321 | 794 | spin_unlock(&nilfs->ns_inode_lock); |
9ff05123 RK |
795 | |
796 | for (pii = ivec; nv > 0; pii++, nv--) | |
797 | iput(&(*pii)->vfs_inode); | |
798 | } | |
799 | } | |
800 | ||
7ef3ff2f RK |
801 | static void nilfs_iput_work_func(struct work_struct *work) |
802 | { | |
803 | struct nilfs_sc_info *sci = container_of(work, struct nilfs_sc_info, | |
804 | sc_iput_work); | |
805 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; | |
806 | ||
807 | nilfs_dispose_list(nilfs, &sci->sc_iput_queue, 0); | |
808 | } | |
809 | ||
e912a5b6 RK |
810 | static int nilfs_test_metadata_dirty(struct the_nilfs *nilfs, |
811 | struct nilfs_root *root) | |
9ff05123 | 812 | { |
9ff05123 RK |
813 | int ret = 0; |
814 | ||
e912a5b6 | 815 | if (nilfs_mdt_fetch_dirty(root->ifile)) |
9ff05123 RK |
816 | ret++; |
817 | if (nilfs_mdt_fetch_dirty(nilfs->ns_cpfile)) | |
818 | ret++; | |
819 | if (nilfs_mdt_fetch_dirty(nilfs->ns_sufile)) | |
820 | ret++; | |
365e215c RK |
821 | if ((ret || nilfs_doing_gc()) && nilfs_mdt_fetch_dirty(nilfs->ns_dat)) |
822 | ret++; | |
9ff05123 RK |
823 | return ret; |
824 | } | |
825 | ||
826 | static int nilfs_segctor_clean(struct nilfs_sc_info *sci) | |
827 | { | |
828 | return list_empty(&sci->sc_dirty_files) && | |
829 | !test_bit(NILFS_SC_DIRTY, &sci->sc_flags) && | |
071cb4b8 | 830 | sci->sc_nfreesegs == 0 && |
9ff05123 RK |
831 | (!nilfs_doing_gc() || list_empty(&sci->sc_gc_inodes)); |
832 | } | |
833 | ||
834 | static int nilfs_segctor_confirm(struct nilfs_sc_info *sci) | |
835 | { | |
e3154e97 | 836 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123 RK |
837 | int ret = 0; |
838 | ||
693dd321 | 839 | if (nilfs_test_metadata_dirty(nilfs, sci->sc_root)) |
9ff05123 RK |
840 | set_bit(NILFS_SC_DIRTY, &sci->sc_flags); |
841 | ||
693dd321 RK |
842 | spin_lock(&nilfs->ns_inode_lock); |
843 | if (list_empty(&nilfs->ns_dirty_files) && nilfs_segctor_clean(sci)) | |
9ff05123 RK |
844 | ret++; |
845 | ||
693dd321 | 846 | spin_unlock(&nilfs->ns_inode_lock); |
9ff05123 RK |
847 | return ret; |
848 | } | |
849 | ||
850 | static void nilfs_segctor_clear_metadata_dirty(struct nilfs_sc_info *sci) | |
851 | { | |
e3154e97 | 852 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123 | 853 | |
e912a5b6 | 854 | nilfs_mdt_clear_dirty(sci->sc_root->ifile); |
9ff05123 RK |
855 | nilfs_mdt_clear_dirty(nilfs->ns_cpfile); |
856 | nilfs_mdt_clear_dirty(nilfs->ns_sufile); | |
365e215c | 857 | nilfs_mdt_clear_dirty(nilfs->ns_dat); |
9ff05123 RK |
858 | } |
859 | ||
860 | static int nilfs_segctor_create_checkpoint(struct nilfs_sc_info *sci) | |
861 | { | |
e3154e97 | 862 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123 RK |
863 | struct buffer_head *bh_cp; |
864 | struct nilfs_checkpoint *raw_cp; | |
865 | int err; | |
866 | ||
867 | /* XXX: this interface will be changed */ | |
868 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 1, | |
869 | &raw_cp, &bh_cp); | |
870 | if (likely(!err)) { | |
076a378b RK |
871 | /* |
872 | * The following code is duplicated with cpfile. But, it is | |
873 | * needed to collect the checkpoint even if it was not newly | |
874 | * created. | |
875 | */ | |
5fc7b141 | 876 | mark_buffer_dirty(bh_cp); |
9ff05123 RK |
877 | nilfs_mdt_mark_dirty(nilfs->ns_cpfile); |
878 | nilfs_cpfile_put_checkpoint( | |
879 | nilfs->ns_cpfile, nilfs->ns_cno, bh_cp); | |
1f5abe7e RK |
880 | } else |
881 | WARN_ON(err == -EINVAL || err == -ENOENT); | |
882 | ||
9ff05123 RK |
883 | return err; |
884 | } | |
885 | ||
886 | static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci) | |
887 | { | |
e3154e97 | 888 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123 RK |
889 | struct buffer_head *bh_cp; |
890 | struct nilfs_checkpoint *raw_cp; | |
891 | int err; | |
892 | ||
893 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 0, | |
894 | &raw_cp, &bh_cp); | |
895 | if (unlikely(err)) { | |
1f5abe7e | 896 | WARN_ON(err == -EINVAL || err == -ENOENT); |
9ff05123 RK |
897 | goto failed_ibh; |
898 | } | |
899 | raw_cp->cp_snapshot_list.ssl_next = 0; | |
900 | raw_cp->cp_snapshot_list.ssl_prev = 0; | |
901 | raw_cp->cp_inodes_count = | |
e5f7f848 | 902 | cpu_to_le64(atomic64_read(&sci->sc_root->inodes_count)); |
9ff05123 | 903 | raw_cp->cp_blocks_count = |
e5f7f848 | 904 | cpu_to_le64(atomic64_read(&sci->sc_root->blocks_count)); |
9ff05123 RK |
905 | raw_cp->cp_nblk_inc = |
906 | cpu_to_le64(sci->sc_nblk_inc + sci->sc_nblk_this_inc); | |
907 | raw_cp->cp_create = cpu_to_le64(sci->sc_seg_ctime); | |
908 | raw_cp->cp_cno = cpu_to_le64(nilfs->ns_cno); | |
458c5b08 | 909 | |
c96fa464 RK |
910 | if (test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags)) |
911 | nilfs_checkpoint_clear_minor(raw_cp); | |
912 | else | |
913 | nilfs_checkpoint_set_minor(raw_cp); | |
914 | ||
e912a5b6 RK |
915 | nilfs_write_inode_common(sci->sc_root->ifile, |
916 | &raw_cp->cp_ifile_inode, 1); | |
9ff05123 RK |
917 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, bh_cp); |
918 | return 0; | |
919 | ||
920 | failed_ibh: | |
921 | return err; | |
922 | } | |
923 | ||
924 | static void nilfs_fill_in_file_bmap(struct inode *ifile, | |
925 | struct nilfs_inode_info *ii) | |
926 | ||
927 | { | |
928 | struct buffer_head *ibh; | |
929 | struct nilfs_inode *raw_inode; | |
930 | ||
931 | if (test_bit(NILFS_I_BMAP, &ii->i_state)) { | |
932 | ibh = ii->i_bh; | |
933 | BUG_ON(!ibh); | |
934 | raw_inode = nilfs_ifile_map_inode(ifile, ii->vfs_inode.i_ino, | |
935 | ibh); | |
936 | nilfs_bmap_write(ii->i_bmap, raw_inode); | |
937 | nilfs_ifile_unmap_inode(ifile, ii->vfs_inode.i_ino, ibh); | |
938 | } | |
939 | } | |
940 | ||
e912a5b6 | 941 | static void nilfs_segctor_fill_in_file_bmap(struct nilfs_sc_info *sci) |
9ff05123 RK |
942 | { |
943 | struct nilfs_inode_info *ii; | |
944 | ||
945 | list_for_each_entry(ii, &sci->sc_dirty_files, i_dirty) { | |
e912a5b6 | 946 | nilfs_fill_in_file_bmap(sci->sc_root->ifile, ii); |
9ff05123 RK |
947 | set_bit(NILFS_I_COLLECTED, &ii->i_state); |
948 | } | |
9ff05123 RK |
949 | } |
950 | ||
9ff05123 RK |
951 | static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info *sci, |
952 | struct the_nilfs *nilfs) | |
953 | { | |
1e2b68bf RK |
954 | struct buffer_head *bh_sr; |
955 | struct nilfs_super_root *raw_sr; | |
0c6c44cb | 956 | unsigned int isz, srsz; |
9ff05123 | 957 | |
1e2b68bf RK |
958 | bh_sr = NILFS_LAST_SEGBUF(&sci->sc_segbufs)->sb_super_root; |
959 | raw_sr = (struct nilfs_super_root *)bh_sr->b_data; | |
56eb5538 RK |
960 | isz = nilfs->ns_inode_size; |
961 | srsz = NILFS_SR_BYTES(isz); | |
1e2b68bf | 962 | |
56eb5538 | 963 | raw_sr->sr_bytes = cpu_to_le16(srsz); |
9ff05123 RK |
964 | raw_sr->sr_nongc_ctime |
965 | = cpu_to_le64(nilfs_doing_gc() ? | |
966 | nilfs->ns_nongc_ctime : sci->sc_seg_ctime); | |
967 | raw_sr->sr_flags = 0; | |
968 | ||
365e215c | 969 | nilfs_write_inode_common(nilfs->ns_dat, (void *)raw_sr + |
3961f0e2 RK |
970 | NILFS_SR_DAT_OFFSET(isz), 1); |
971 | nilfs_write_inode_common(nilfs->ns_cpfile, (void *)raw_sr + | |
972 | NILFS_SR_CPFILE_OFFSET(isz), 1); | |
973 | nilfs_write_inode_common(nilfs->ns_sufile, (void *)raw_sr + | |
974 | NILFS_SR_SUFILE_OFFSET(isz), 1); | |
56eb5538 | 975 | memset((void *)raw_sr + srsz, 0, nilfs->ns_blocksize - srsz); |
9ff05123 RK |
976 | } |
977 | ||
978 | static void nilfs_redirty_inodes(struct list_head *head) | |
979 | { | |
980 | struct nilfs_inode_info *ii; | |
981 | ||
982 | list_for_each_entry(ii, head, i_dirty) { | |
983 | if (test_bit(NILFS_I_COLLECTED, &ii->i_state)) | |
984 | clear_bit(NILFS_I_COLLECTED, &ii->i_state); | |
985 | } | |
986 | } | |
987 | ||
988 | static void nilfs_drop_collected_inodes(struct list_head *head) | |
989 | { | |
990 | struct nilfs_inode_info *ii; | |
991 | ||
992 | list_for_each_entry(ii, head, i_dirty) { | |
993 | if (!test_and_clear_bit(NILFS_I_COLLECTED, &ii->i_state)) | |
994 | continue; | |
995 | ||
b9f66140 | 996 | clear_bit(NILFS_I_INODE_SYNC, &ii->i_state); |
9ff05123 RK |
997 | set_bit(NILFS_I_UPDATED, &ii->i_state); |
998 | } | |
999 | } | |
1000 | ||
9ff05123 RK |
1001 | static int nilfs_segctor_apply_buffers(struct nilfs_sc_info *sci, |
1002 | struct inode *inode, | |
1003 | struct list_head *listp, | |
1004 | int (*collect)(struct nilfs_sc_info *, | |
1005 | struct buffer_head *, | |
1006 | struct inode *)) | |
1007 | { | |
1008 | struct buffer_head *bh, *n; | |
1009 | int err = 0; | |
1010 | ||
1011 | if (collect) { | |
1012 | list_for_each_entry_safe(bh, n, listp, b_assoc_buffers) { | |
1013 | list_del_init(&bh->b_assoc_buffers); | |
1014 | err = collect(sci, bh, inode); | |
1015 | brelse(bh); | |
1016 | if (unlikely(err)) | |
1017 | goto dispose_buffers; | |
1018 | } | |
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | dispose_buffers: | |
1023 | while (!list_empty(listp)) { | |
0cc12838 RK |
1024 | bh = list_first_entry(listp, struct buffer_head, |
1025 | b_assoc_buffers); | |
9ff05123 RK |
1026 | list_del_init(&bh->b_assoc_buffers); |
1027 | brelse(bh); | |
1028 | } | |
1029 | return err; | |
1030 | } | |
1031 | ||
f30bf3e4 RK |
1032 | static size_t nilfs_segctor_buffer_rest(struct nilfs_sc_info *sci) |
1033 | { | |
1034 | /* Remaining number of blocks within segment buffer */ | |
1035 | return sci->sc_segbuf_nblocks - | |
1036 | (sci->sc_nblk_this_inc + sci->sc_curseg->sb_sum.nblocks); | |
1037 | } | |
1038 | ||
9ff05123 RK |
1039 | static int nilfs_segctor_scan_file(struct nilfs_sc_info *sci, |
1040 | struct inode *inode, | |
1c613cb9 | 1041 | const struct nilfs_sc_operations *sc_ops) |
9ff05123 RK |
1042 | { |
1043 | LIST_HEAD(data_buffers); | |
1044 | LIST_HEAD(node_buffers); | |
f30bf3e4 | 1045 | int err; |
9ff05123 RK |
1046 | |
1047 | if (!(sci->sc_stage.flags & NILFS_CF_NODE)) { | |
f30bf3e4 RK |
1048 | size_t n, rest = nilfs_segctor_buffer_rest(sci); |
1049 | ||
1050 | n = nilfs_lookup_dirty_data_buffers( | |
1051 | inode, &data_buffers, rest + 1, 0, LLONG_MAX); | |
1052 | if (n > rest) { | |
1053 | err = nilfs_segctor_apply_buffers( | |
9ff05123 | 1054 | sci, inode, &data_buffers, |
f30bf3e4 RK |
1055 | sc_ops->collect_data); |
1056 | BUG_ON(!err); /* always receive -E2BIG or true error */ | |
9ff05123 RK |
1057 | goto break_or_fail; |
1058 | } | |
1059 | } | |
1060 | nilfs_lookup_dirty_node_buffers(inode, &node_buffers); | |
1061 | ||
1062 | if (!(sci->sc_stage.flags & NILFS_CF_NODE)) { | |
1063 | err = nilfs_segctor_apply_buffers( | |
1064 | sci, inode, &data_buffers, sc_ops->collect_data); | |
1065 | if (unlikely(err)) { | |
1066 | /* dispose node list */ | |
1067 | nilfs_segctor_apply_buffers( | |
1068 | sci, inode, &node_buffers, NULL); | |
1069 | goto break_or_fail; | |
1070 | } | |
1071 | sci->sc_stage.flags |= NILFS_CF_NODE; | |
1072 | } | |
1073 | /* Collect node */ | |
1074 | err = nilfs_segctor_apply_buffers( | |
1075 | sci, inode, &node_buffers, sc_ops->collect_node); | |
1076 | if (unlikely(err)) | |
1077 | goto break_or_fail; | |
1078 | ||
1079 | nilfs_bmap_lookup_dirty_buffers(NILFS_I(inode)->i_bmap, &node_buffers); | |
1080 | err = nilfs_segctor_apply_buffers( | |
1081 | sci, inode, &node_buffers, sc_ops->collect_bmap); | |
1082 | if (unlikely(err)) | |
1083 | goto break_or_fail; | |
1084 | ||
1085 | nilfs_segctor_end_finfo(sci, inode); | |
1086 | sci->sc_stage.flags &= ~NILFS_CF_NODE; | |
1087 | ||
1088 | break_or_fail: | |
1089 | return err; | |
1090 | } | |
1091 | ||
1092 | static int nilfs_segctor_scan_file_dsync(struct nilfs_sc_info *sci, | |
1093 | struct inode *inode) | |
1094 | { | |
1095 | LIST_HEAD(data_buffers); | |
f30bf3e4 RK |
1096 | size_t n, rest = nilfs_segctor_buffer_rest(sci); |
1097 | int err; | |
9ff05123 | 1098 | |
f30bf3e4 RK |
1099 | n = nilfs_lookup_dirty_data_buffers(inode, &data_buffers, rest + 1, |
1100 | sci->sc_dsync_start, | |
1101 | sci->sc_dsync_end); | |
1102 | ||
1103 | err = nilfs_segctor_apply_buffers(sci, inode, &data_buffers, | |
1104 | nilfs_collect_file_data); | |
1105 | if (!err) { | |
9ff05123 | 1106 | nilfs_segctor_end_finfo(sci, inode); |
f30bf3e4 RK |
1107 | BUG_ON(n > rest); |
1108 | /* always receive -E2BIG or true error if n > rest */ | |
1109 | } | |
9ff05123 RK |
1110 | return err; |
1111 | } | |
1112 | ||
1113 | static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode) | |
1114 | { | |
e3154e97 | 1115 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123 RK |
1116 | struct list_head *head; |
1117 | struct nilfs_inode_info *ii; | |
071cb4b8 | 1118 | size_t ndone; |
9ff05123 RK |
1119 | int err = 0; |
1120 | ||
58497703 | 1121 | switch (nilfs_sc_cstage_get(sci)) { |
9ff05123 RK |
1122 | case NILFS_ST_INIT: |
1123 | /* Pre-processes */ | |
1124 | sci->sc_stage.flags = 0; | |
1125 | ||
1126 | if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) { | |
1127 | sci->sc_nblk_inc = 0; | |
1128 | sci->sc_curseg->sb_sum.flags = NILFS_SS_LOGBGN; | |
1129 | if (mode == SC_LSEG_DSYNC) { | |
58497703 | 1130 | nilfs_sc_cstage_set(sci, NILFS_ST_DSYNC); |
9ff05123 RK |
1131 | goto dsync_mode; |
1132 | } | |
1133 | } | |
1134 | ||
1135 | sci->sc_stage.dirty_file_ptr = NULL; | |
1136 | sci->sc_stage.gc_inode_ptr = NULL; | |
1137 | if (mode == SC_FLUSH_DAT) { | |
58497703 | 1138 | nilfs_sc_cstage_set(sci, NILFS_ST_DAT); |
9ff05123 RK |
1139 | goto dat_stage; |
1140 | } | |
58497703 | 1141 | nilfs_sc_cstage_inc(sci); /* Fall through */ |
9ff05123 RK |
1142 | case NILFS_ST_GC: |
1143 | if (nilfs_doing_gc()) { | |
1144 | head = &sci->sc_gc_inodes; | |
1145 | ii = list_prepare_entry(sci->sc_stage.gc_inode_ptr, | |
1146 | head, i_dirty); | |
1147 | list_for_each_entry_continue(ii, head, i_dirty) { | |
1148 | err = nilfs_segctor_scan_file( | |
1149 | sci, &ii->vfs_inode, | |
1150 | &nilfs_sc_file_ops); | |
1151 | if (unlikely(err)) { | |
1152 | sci->sc_stage.gc_inode_ptr = list_entry( | |
1153 | ii->i_dirty.prev, | |
1154 | struct nilfs_inode_info, | |
1155 | i_dirty); | |
1156 | goto break_or_fail; | |
1157 | } | |
1158 | set_bit(NILFS_I_COLLECTED, &ii->i_state); | |
1159 | } | |
1160 | sci->sc_stage.gc_inode_ptr = NULL; | |
1161 | } | |
58497703 | 1162 | nilfs_sc_cstage_inc(sci); /* Fall through */ |
9ff05123 RK |
1163 | case NILFS_ST_FILE: |
1164 | head = &sci->sc_dirty_files; | |
1165 | ii = list_prepare_entry(sci->sc_stage.dirty_file_ptr, head, | |
1166 | i_dirty); | |
1167 | list_for_each_entry_continue(ii, head, i_dirty) { | |
1168 | clear_bit(NILFS_I_DIRTY, &ii->i_state); | |
1169 | ||
1170 | err = nilfs_segctor_scan_file(sci, &ii->vfs_inode, | |
1171 | &nilfs_sc_file_ops); | |
1172 | if (unlikely(err)) { | |
1173 | sci->sc_stage.dirty_file_ptr = | |
1174 | list_entry(ii->i_dirty.prev, | |
1175 | struct nilfs_inode_info, | |
1176 | i_dirty); | |
1177 | goto break_or_fail; | |
1178 | } | |
1179 | /* sci->sc_stage.dirty_file_ptr = NILFS_I(inode); */ | |
1180 | /* XXX: required ? */ | |
1181 | } | |
1182 | sci->sc_stage.dirty_file_ptr = NULL; | |
1183 | if (mode == SC_FLUSH_FILE) { | |
58497703 | 1184 | nilfs_sc_cstage_set(sci, NILFS_ST_DONE); |
9ff05123 RK |
1185 | return 0; |
1186 | } | |
58497703 | 1187 | nilfs_sc_cstage_inc(sci); |
9ff05123 RK |
1188 | sci->sc_stage.flags |= NILFS_CF_IFILE_STARTED; |
1189 | /* Fall through */ | |
1190 | case NILFS_ST_IFILE: | |
e912a5b6 | 1191 | err = nilfs_segctor_scan_file(sci, sci->sc_root->ifile, |
9ff05123 RK |
1192 | &nilfs_sc_file_ops); |
1193 | if (unlikely(err)) | |
1194 | break; | |
58497703 | 1195 | nilfs_sc_cstage_inc(sci); |
9ff05123 RK |
1196 | /* Creating a checkpoint */ |
1197 | err = nilfs_segctor_create_checkpoint(sci); | |
1198 | if (unlikely(err)) | |
1199 | break; | |
1200 | /* Fall through */ | |
1201 | case NILFS_ST_CPFILE: | |
1202 | err = nilfs_segctor_scan_file(sci, nilfs->ns_cpfile, | |
1203 | &nilfs_sc_file_ops); | |
1204 | if (unlikely(err)) | |
1205 | break; | |
58497703 | 1206 | nilfs_sc_cstage_inc(sci); /* Fall through */ |
9ff05123 | 1207 | case NILFS_ST_SUFILE: |
071cb4b8 RK |
1208 | err = nilfs_sufile_freev(nilfs->ns_sufile, sci->sc_freesegs, |
1209 | sci->sc_nfreesegs, &ndone); | |
1210 | if (unlikely(err)) { | |
1211 | nilfs_sufile_cancel_freev(nilfs->ns_sufile, | |
1212 | sci->sc_freesegs, ndone, | |
1213 | NULL); | |
9ff05123 | 1214 | break; |
071cb4b8 RK |
1215 | } |
1216 | sci->sc_stage.flags |= NILFS_CF_SUFREED; | |
1217 | ||
9ff05123 RK |
1218 | err = nilfs_segctor_scan_file(sci, nilfs->ns_sufile, |
1219 | &nilfs_sc_file_ops); | |
1220 | if (unlikely(err)) | |
1221 | break; | |
58497703 | 1222 | nilfs_sc_cstage_inc(sci); /* Fall through */ |
9ff05123 RK |
1223 | case NILFS_ST_DAT: |
1224 | dat_stage: | |
365e215c | 1225 | err = nilfs_segctor_scan_file(sci, nilfs->ns_dat, |
9ff05123 RK |
1226 | &nilfs_sc_dat_ops); |
1227 | if (unlikely(err)) | |
1228 | break; | |
1229 | if (mode == SC_FLUSH_DAT) { | |
58497703 | 1230 | nilfs_sc_cstage_set(sci, NILFS_ST_DONE); |
9ff05123 RK |
1231 | return 0; |
1232 | } | |
58497703 | 1233 | nilfs_sc_cstage_inc(sci); /* Fall through */ |
9ff05123 RK |
1234 | case NILFS_ST_SR: |
1235 | if (mode == SC_LSEG_SR) { | |
1236 | /* Appending a super root */ | |
1237 | err = nilfs_segctor_add_super_root(sci); | |
1238 | if (unlikely(err)) | |
1239 | break; | |
1240 | } | |
1241 | /* End of a logical segment */ | |
1242 | sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND; | |
58497703 | 1243 | nilfs_sc_cstage_set(sci, NILFS_ST_DONE); |
9ff05123 RK |
1244 | return 0; |
1245 | case NILFS_ST_DSYNC: | |
1246 | dsync_mode: | |
1247 | sci->sc_curseg->sb_sum.flags |= NILFS_SS_SYNDT; | |
f30bf3e4 | 1248 | ii = sci->sc_dsync_inode; |
9ff05123 RK |
1249 | if (!test_bit(NILFS_I_BUSY, &ii->i_state)) |
1250 | break; | |
1251 | ||
1252 | err = nilfs_segctor_scan_file_dsync(sci, &ii->vfs_inode); | |
1253 | if (unlikely(err)) | |
1254 | break; | |
9ff05123 | 1255 | sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND; |
58497703 | 1256 | nilfs_sc_cstage_set(sci, NILFS_ST_DONE); |
9ff05123 RK |
1257 | return 0; |
1258 | case NILFS_ST_DONE: | |
1259 | return 0; | |
1260 | default: | |
1261 | BUG(); | |
1262 | } | |
1263 | ||
1264 | break_or_fail: | |
1265 | return err; | |
1266 | } | |
1267 | ||
a694291a RK |
1268 | /** |
1269 | * nilfs_segctor_begin_construction - setup segment buffer to make a new log | |
1270 | * @sci: nilfs_sc_info | |
1271 | * @nilfs: nilfs object | |
1272 | */ | |
9ff05123 RK |
1273 | static int nilfs_segctor_begin_construction(struct nilfs_sc_info *sci, |
1274 | struct the_nilfs *nilfs) | |
1275 | { | |
a694291a | 1276 | struct nilfs_segment_buffer *segbuf, *prev; |
9ff05123 | 1277 | __u64 nextnum; |
a694291a | 1278 | int err, alloc = 0; |
9ff05123 | 1279 | |
a694291a RK |
1280 | segbuf = nilfs_segbuf_new(sci->sc_super); |
1281 | if (unlikely(!segbuf)) | |
1282 | return -ENOMEM; | |
9ff05123 | 1283 | |
a694291a RK |
1284 | if (list_empty(&sci->sc_write_logs)) { |
1285 | nilfs_segbuf_map(segbuf, nilfs->ns_segnum, | |
1286 | nilfs->ns_pseg_offset, nilfs); | |
1287 | if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) { | |
1288 | nilfs_shift_to_next_segment(nilfs); | |
1289 | nilfs_segbuf_map(segbuf, nilfs->ns_segnum, 0, nilfs); | |
1290 | } | |
9ff05123 | 1291 | |
a694291a RK |
1292 | segbuf->sb_sum.seg_seq = nilfs->ns_seg_seq; |
1293 | nextnum = nilfs->ns_nextnum; | |
1294 | ||
1295 | if (nilfs->ns_segnum == nilfs->ns_nextnum) | |
1296 | /* Start from the head of a new full segment */ | |
1297 | alloc++; | |
1298 | } else { | |
1299 | /* Continue logs */ | |
1300 | prev = NILFS_LAST_SEGBUF(&sci->sc_write_logs); | |
1301 | nilfs_segbuf_map_cont(segbuf, prev); | |
1302 | segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq; | |
1303 | nextnum = prev->sb_nextnum; | |
1304 | ||
1305 | if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) { | |
1306 | nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs); | |
1307 | segbuf->sb_sum.seg_seq++; | |
1308 | alloc++; | |
1309 | } | |
9ff05123 | 1310 | } |
9ff05123 | 1311 | |
61a189e9 | 1312 | err = nilfs_sufile_mark_dirty(nilfs->ns_sufile, segbuf->sb_segnum); |
a694291a RK |
1313 | if (err) |
1314 | goto failed; | |
9ff05123 | 1315 | |
a694291a | 1316 | if (alloc) { |
cece5520 | 1317 | err = nilfs_sufile_alloc(nilfs->ns_sufile, &nextnum); |
a694291a RK |
1318 | if (err) |
1319 | goto failed; | |
1320 | } | |
9ff05123 RK |
1321 | nilfs_segbuf_set_next_segnum(segbuf, nextnum, nilfs); |
1322 | ||
a694291a RK |
1323 | BUG_ON(!list_empty(&sci->sc_segbufs)); |
1324 | list_add_tail(&segbuf->sb_list, &sci->sc_segbufs); | |
1325 | sci->sc_segbuf_nblocks = segbuf->sb_rest_blocks; | |
cece5520 | 1326 | return 0; |
a694291a RK |
1327 | |
1328 | failed: | |
1329 | nilfs_segbuf_free(segbuf); | |
1330 | return err; | |
9ff05123 RK |
1331 | } |
1332 | ||
1333 | static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci, | |
1334 | struct the_nilfs *nilfs, int nadd) | |
1335 | { | |
e29df395 | 1336 | struct nilfs_segment_buffer *segbuf, *prev; |
9ff05123 RK |
1337 | struct inode *sufile = nilfs->ns_sufile; |
1338 | __u64 nextnextnum; | |
1339 | LIST_HEAD(list); | |
1340 | int err, ret, i; | |
1341 | ||
1342 | prev = NILFS_LAST_SEGBUF(&sci->sc_segbufs); | |
1343 | /* | |
1344 | * Since the segment specified with nextnum might be allocated during | |
1345 | * the previous construction, the buffer including its segusage may | |
1346 | * not be dirty. The following call ensures that the buffer is dirty | |
1347 | * and will pin the buffer on memory until the sufile is written. | |
1348 | */ | |
61a189e9 | 1349 | err = nilfs_sufile_mark_dirty(sufile, prev->sb_nextnum); |
9ff05123 RK |
1350 | if (unlikely(err)) |
1351 | return err; | |
1352 | ||
1353 | for (i = 0; i < nadd; i++) { | |
1354 | /* extend segment info */ | |
1355 | err = -ENOMEM; | |
1356 | segbuf = nilfs_segbuf_new(sci->sc_super); | |
1357 | if (unlikely(!segbuf)) | |
1358 | goto failed; | |
1359 | ||
1360 | /* map this buffer to region of segment on-disk */ | |
cece5520 | 1361 | nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs); |
9ff05123 RK |
1362 | sci->sc_segbuf_nblocks += segbuf->sb_rest_blocks; |
1363 | ||
1364 | /* allocate the next next full segment */ | |
1365 | err = nilfs_sufile_alloc(sufile, &nextnextnum); | |
1366 | if (unlikely(err)) | |
1367 | goto failed_segbuf; | |
1368 | ||
1369 | segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq + 1; | |
1370 | nilfs_segbuf_set_next_segnum(segbuf, nextnextnum, nilfs); | |
1371 | ||
1372 | list_add_tail(&segbuf->sb_list, &list); | |
1373 | prev = segbuf; | |
1374 | } | |
0935db74 | 1375 | list_splice_tail(&list, &sci->sc_segbufs); |
9ff05123 RK |
1376 | return 0; |
1377 | ||
1378 | failed_segbuf: | |
1379 | nilfs_segbuf_free(segbuf); | |
1380 | failed: | |
e29df395 | 1381 | list_for_each_entry(segbuf, &list, sb_list) { |
9ff05123 | 1382 | ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); |
1f5abe7e | 1383 | WARN_ON(ret); /* never fails */ |
9ff05123 | 1384 | } |
e29df395 | 1385 | nilfs_destroy_logs(&list); |
9ff05123 RK |
1386 | return err; |
1387 | } | |
1388 | ||
a694291a RK |
1389 | static void nilfs_free_incomplete_logs(struct list_head *logs, |
1390 | struct the_nilfs *nilfs) | |
9ff05123 | 1391 | { |
a694291a RK |
1392 | struct nilfs_segment_buffer *segbuf, *prev; |
1393 | struct inode *sufile = nilfs->ns_sufile; | |
9284ad2a | 1394 | int ret; |
9ff05123 | 1395 | |
a694291a | 1396 | segbuf = NILFS_FIRST_SEGBUF(logs); |
9ff05123 | 1397 | if (nilfs->ns_nextnum != segbuf->sb_nextnum) { |
a694291a | 1398 | ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); |
1f5abe7e | 1399 | WARN_ON(ret); /* never fails */ |
9ff05123 | 1400 | } |
9284ad2a | 1401 | if (atomic_read(&segbuf->sb_err)) { |
9ff05123 RK |
1402 | /* Case 1: The first segment failed */ |
1403 | if (segbuf->sb_pseg_start != segbuf->sb_fseg_start) | |
076a378b RK |
1404 | /* |
1405 | * Case 1a: Partial segment appended into an existing | |
1406 | * segment | |
1407 | */ | |
9ff05123 RK |
1408 | nilfs_terminate_segment(nilfs, segbuf->sb_fseg_start, |
1409 | segbuf->sb_fseg_end); | |
1410 | else /* Case 1b: New full segment */ | |
1411 | set_nilfs_discontinued(nilfs); | |
9ff05123 RK |
1412 | } |
1413 | ||
a694291a RK |
1414 | prev = segbuf; |
1415 | list_for_each_entry_continue(segbuf, logs, sb_list) { | |
1416 | if (prev->sb_nextnum != segbuf->sb_nextnum) { | |
1417 | ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); | |
1418 | WARN_ON(ret); /* never fails */ | |
1419 | } | |
9284ad2a RK |
1420 | if (atomic_read(&segbuf->sb_err) && |
1421 | segbuf->sb_segnum != nilfs->ns_nextnum) | |
1422 | /* Case 2: extended segment (!= next) failed */ | |
a694291a RK |
1423 | nilfs_sufile_set_error(sufile, segbuf->sb_segnum); |
1424 | prev = segbuf; | |
9ff05123 | 1425 | } |
9ff05123 RK |
1426 | } |
1427 | ||
1428 | static void nilfs_segctor_update_segusage(struct nilfs_sc_info *sci, | |
1429 | struct inode *sufile) | |
1430 | { | |
1431 | struct nilfs_segment_buffer *segbuf; | |
9ff05123 RK |
1432 | unsigned long live_blocks; |
1433 | int ret; | |
1434 | ||
1435 | list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) { | |
9ff05123 RK |
1436 | live_blocks = segbuf->sb_sum.nblocks + |
1437 | (segbuf->sb_pseg_start - segbuf->sb_fseg_start); | |
071ec54d RK |
1438 | ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum, |
1439 | live_blocks, | |
1440 | sci->sc_seg_ctime); | |
1441 | WARN_ON(ret); /* always succeed because the segusage is dirty */ | |
9ff05123 RK |
1442 | } |
1443 | } | |
1444 | ||
a694291a | 1445 | static void nilfs_cancel_segusage(struct list_head *logs, struct inode *sufile) |
9ff05123 RK |
1446 | { |
1447 | struct nilfs_segment_buffer *segbuf; | |
9ff05123 RK |
1448 | int ret; |
1449 | ||
a694291a | 1450 | segbuf = NILFS_FIRST_SEGBUF(logs); |
071ec54d RK |
1451 | ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum, |
1452 | segbuf->sb_pseg_start - | |
1453 | segbuf->sb_fseg_start, 0); | |
1454 | WARN_ON(ret); /* always succeed because the segusage is dirty */ | |
9ff05123 | 1455 | |
a694291a | 1456 | list_for_each_entry_continue(segbuf, logs, sb_list) { |
071ec54d RK |
1457 | ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum, |
1458 | 0, 0); | |
1f5abe7e | 1459 | WARN_ON(ret); /* always succeed */ |
9ff05123 RK |
1460 | } |
1461 | } | |
1462 | ||
1463 | static void nilfs_segctor_truncate_segments(struct nilfs_sc_info *sci, | |
1464 | struct nilfs_segment_buffer *last, | |
1465 | struct inode *sufile) | |
1466 | { | |
e29df395 | 1467 | struct nilfs_segment_buffer *segbuf = last; |
9ff05123 RK |
1468 | int ret; |
1469 | ||
e29df395 | 1470 | list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) { |
9ff05123 RK |
1471 | sci->sc_segbuf_nblocks -= segbuf->sb_rest_blocks; |
1472 | ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); | |
1f5abe7e | 1473 | WARN_ON(ret); |
9ff05123 | 1474 | } |
e29df395 | 1475 | nilfs_truncate_logs(&sci->sc_segbufs, last); |
9ff05123 RK |
1476 | } |
1477 | ||
1478 | ||
1479 | static int nilfs_segctor_collect(struct nilfs_sc_info *sci, | |
1480 | struct the_nilfs *nilfs, int mode) | |
1481 | { | |
1482 | struct nilfs_cstage prev_stage = sci->sc_stage; | |
1483 | int err, nadd = 1; | |
1484 | ||
1485 | /* Collection retry loop */ | |
1486 | for (;;) { | |
9ff05123 RK |
1487 | sci->sc_nblk_this_inc = 0; |
1488 | sci->sc_curseg = NILFS_FIRST_SEGBUF(&sci->sc_segbufs); | |
1489 | ||
1490 | err = nilfs_segctor_reset_segment_buffer(sci); | |
1491 | if (unlikely(err)) | |
1492 | goto failed; | |
1493 | ||
1494 | err = nilfs_segctor_collect_blocks(sci, mode); | |
1495 | sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks; | |
1496 | if (!err) | |
1497 | break; | |
1498 | ||
1499 | if (unlikely(err != -E2BIG)) | |
1500 | goto failed; | |
1501 | ||
1502 | /* The current segment is filled up */ | |
58497703 HM |
1503 | if (mode != SC_LSEG_SR || |
1504 | nilfs_sc_cstage_get(sci) < NILFS_ST_CPFILE) | |
9ff05123 RK |
1505 | break; |
1506 | ||
2d8428ac RK |
1507 | nilfs_clear_logs(&sci->sc_segbufs); |
1508 | ||
071cb4b8 RK |
1509 | if (sci->sc_stage.flags & NILFS_CF_SUFREED) { |
1510 | err = nilfs_sufile_cancel_freev(nilfs->ns_sufile, | |
1511 | sci->sc_freesegs, | |
1512 | sci->sc_nfreesegs, | |
1513 | NULL); | |
1514 | WARN_ON(err); /* do not happen */ | |
70f2fe3a | 1515 | sci->sc_stage.flags &= ~NILFS_CF_SUFREED; |
071cb4b8 | 1516 | } |
70f2fe3a AR |
1517 | |
1518 | err = nilfs_segctor_extend_segments(sci, nilfs, nadd); | |
1519 | if (unlikely(err)) | |
1520 | return err; | |
1521 | ||
9ff05123 RK |
1522 | nadd = min_t(int, nadd << 1, SC_MAX_SEGDELTA); |
1523 | sci->sc_stage = prev_stage; | |
1524 | } | |
1525 | nilfs_segctor_truncate_segments(sci, sci->sc_curseg, nilfs->ns_sufile); | |
1526 | return 0; | |
1527 | ||
1528 | failed: | |
1529 | return err; | |
1530 | } | |
1531 | ||
1532 | static void nilfs_list_replace_buffer(struct buffer_head *old_bh, | |
1533 | struct buffer_head *new_bh) | |
1534 | { | |
1535 | BUG_ON(!list_empty(&new_bh->b_assoc_buffers)); | |
1536 | ||
1537 | list_replace_init(&old_bh->b_assoc_buffers, &new_bh->b_assoc_buffers); | |
1538 | /* The caller must release old_bh */ | |
1539 | } | |
1540 | ||
1541 | static int | |
1542 | nilfs_segctor_update_payload_blocknr(struct nilfs_sc_info *sci, | |
1543 | struct nilfs_segment_buffer *segbuf, | |
1544 | int mode) | |
1545 | { | |
1546 | struct inode *inode = NULL; | |
1547 | sector_t blocknr; | |
1548 | unsigned long nfinfo = segbuf->sb_sum.nfinfo; | |
1549 | unsigned long nblocks = 0, ndatablk = 0; | |
1c613cb9 | 1550 | const struct nilfs_sc_operations *sc_op = NULL; |
9ff05123 RK |
1551 | struct nilfs_segsum_pointer ssp; |
1552 | struct nilfs_finfo *finfo = NULL; | |
1553 | union nilfs_binfo binfo; | |
1554 | struct buffer_head *bh, *bh_org; | |
1555 | ino_t ino = 0; | |
1556 | int err = 0; | |
1557 | ||
1558 | if (!nfinfo) | |
1559 | goto out; | |
1560 | ||
1561 | blocknr = segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk; | |
1562 | ssp.bh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers); | |
1563 | ssp.offset = sizeof(struct nilfs_segment_summary); | |
1564 | ||
1565 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) { | |
1e2b68bf | 1566 | if (bh == segbuf->sb_super_root) |
9ff05123 RK |
1567 | break; |
1568 | if (!finfo) { | |
1569 | finfo = nilfs_segctor_map_segsum_entry( | |
1570 | sci, &ssp, sizeof(*finfo)); | |
1571 | ino = le64_to_cpu(finfo->fi_ino); | |
1572 | nblocks = le32_to_cpu(finfo->fi_nblocks); | |
1573 | ndatablk = le32_to_cpu(finfo->fi_ndatablk); | |
1574 | ||
aa405b1f | 1575 | inode = bh->b_page->mapping->host; |
9ff05123 RK |
1576 | |
1577 | if (mode == SC_LSEG_DSYNC) | |
1578 | sc_op = &nilfs_sc_dsync_ops; | |
1579 | else if (ino == NILFS_DAT_INO) | |
1580 | sc_op = &nilfs_sc_dat_ops; | |
1581 | else /* file blocks */ | |
1582 | sc_op = &nilfs_sc_file_ops; | |
1583 | } | |
1584 | bh_org = bh; | |
1585 | get_bh(bh_org); | |
1586 | err = nilfs_bmap_assign(NILFS_I(inode)->i_bmap, &bh, blocknr, | |
1587 | &binfo); | |
1588 | if (bh != bh_org) | |
1589 | nilfs_list_replace_buffer(bh_org, bh); | |
1590 | brelse(bh_org); | |
1591 | if (unlikely(err)) | |
1592 | goto failed_bmap; | |
1593 | ||
1594 | if (ndatablk > 0) | |
1595 | sc_op->write_data_binfo(sci, &ssp, &binfo); | |
1596 | else | |
1597 | sc_op->write_node_binfo(sci, &ssp, &binfo); | |
1598 | ||
1599 | blocknr++; | |
1600 | if (--nblocks == 0) { | |
1601 | finfo = NULL; | |
1602 | if (--nfinfo == 0) | |
1603 | break; | |
1604 | } else if (ndatablk > 0) | |
1605 | ndatablk--; | |
1606 | } | |
1607 | out: | |
1608 | return 0; | |
1609 | ||
1610 | failed_bmap: | |
9ff05123 RK |
1611 | return err; |
1612 | } | |
1613 | ||
1614 | static int nilfs_segctor_assign(struct nilfs_sc_info *sci, int mode) | |
1615 | { | |
1616 | struct nilfs_segment_buffer *segbuf; | |
1617 | int err; | |
1618 | ||
1619 | list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) { | |
1620 | err = nilfs_segctor_update_payload_blocknr(sci, segbuf, mode); | |
1621 | if (unlikely(err)) | |
1622 | return err; | |
1623 | nilfs_segbuf_fill_in_segsum(segbuf); | |
1624 | } | |
1625 | return 0; | |
1626 | } | |
1627 | ||
1cb2d38c | 1628 | static void nilfs_begin_page_io(struct page *page) |
9ff05123 RK |
1629 | { |
1630 | if (!page || PageWriteback(page)) | |
076a378b RK |
1631 | /* |
1632 | * For split b-tree node pages, this function may be called | |
1633 | * twice. We ignore the 2nd or later calls by this check. | |
1634 | */ | |
1cb2d38c | 1635 | return; |
9ff05123 RK |
1636 | |
1637 | lock_page(page); | |
1638 | clear_page_dirty_for_io(page); | |
1639 | set_page_writeback(page); | |
1640 | unlock_page(page); | |
9ff05123 RK |
1641 | } |
1642 | ||
1cb2d38c | 1643 | static void nilfs_segctor_prepare_write(struct nilfs_sc_info *sci) |
9ff05123 RK |
1644 | { |
1645 | struct nilfs_segment_buffer *segbuf; | |
1646 | struct page *bd_page = NULL, *fs_page = NULL; | |
9ff05123 | 1647 | |
9ff05123 RK |
1648 | list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) { |
1649 | struct buffer_head *bh; | |
1650 | ||
1651 | list_for_each_entry(bh, &segbuf->sb_segsum_buffers, | |
1652 | b_assoc_buffers) { | |
1653 | if (bh->b_page != bd_page) { | |
1654 | if (bd_page) { | |
1655 | lock_page(bd_page); | |
1656 | clear_page_dirty_for_io(bd_page); | |
1657 | set_page_writeback(bd_page); | |
1658 | unlock_page(bd_page); | |
1659 | } | |
1660 | bd_page = bh->b_page; | |
1661 | } | |
1662 | } | |
1663 | ||
1664 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, | |
1665 | b_assoc_buffers) { | |
7f42ec39 | 1666 | set_buffer_async_write(bh); |
1e2b68bf | 1667 | if (bh == segbuf->sb_super_root) { |
9ff05123 RK |
1668 | if (bh->b_page != bd_page) { |
1669 | lock_page(bd_page); | |
1670 | clear_page_dirty_for_io(bd_page); | |
1671 | set_page_writeback(bd_page); | |
1672 | unlock_page(bd_page); | |
1673 | bd_page = bh->b_page; | |
1674 | } | |
1675 | break; | |
1676 | } | |
1677 | if (bh->b_page != fs_page) { | |
1cb2d38c | 1678 | nilfs_begin_page_io(fs_page); |
9ff05123 RK |
1679 | fs_page = bh->b_page; |
1680 | } | |
1681 | } | |
1682 | } | |
1683 | if (bd_page) { | |
1684 | lock_page(bd_page); | |
1685 | clear_page_dirty_for_io(bd_page); | |
1686 | set_page_writeback(bd_page); | |
1687 | unlock_page(bd_page); | |
1688 | } | |
1cb2d38c | 1689 | nilfs_begin_page_io(fs_page); |
9ff05123 RK |
1690 | } |
1691 | ||
1692 | static int nilfs_segctor_write(struct nilfs_sc_info *sci, | |
9c965bac | 1693 | struct the_nilfs *nilfs) |
9ff05123 | 1694 | { |
d1c6b72a | 1695 | int ret; |
9ff05123 | 1696 | |
d1c6b72a | 1697 | ret = nilfs_write_logs(&sci->sc_segbufs, nilfs); |
a694291a RK |
1698 | list_splice_tail_init(&sci->sc_segbufs, &sci->sc_write_logs); |
1699 | return ret; | |
9ff05123 RK |
1700 | } |
1701 | ||
9ff05123 RK |
1702 | static void nilfs_end_page_io(struct page *page, int err) |
1703 | { | |
1704 | if (!page) | |
1705 | return; | |
1706 | ||
a9777845 | 1707 | if (buffer_nilfs_node(page_buffers(page)) && !PageWriteback(page)) { |
8227b297 RK |
1708 | /* |
1709 | * For b-tree node pages, this function may be called twice | |
1710 | * or more because they might be split in a segment. | |
1711 | */ | |
a9777845 RK |
1712 | if (PageDirty(page)) { |
1713 | /* | |
1714 | * For pages holding split b-tree node buffers, dirty | |
1715 | * flag on the buffers may be cleared discretely. | |
1716 | * In that case, the page is once redirtied for | |
1717 | * remaining buffers, and it must be cancelled if | |
1718 | * all the buffers get cleaned later. | |
1719 | */ | |
1720 | lock_page(page); | |
1721 | if (nilfs_page_buffers_clean(page)) | |
1722 | __nilfs_clear_page_dirty(page); | |
1723 | unlock_page(page); | |
1724 | } | |
9ff05123 | 1725 | return; |
a9777845 | 1726 | } |
9ff05123 | 1727 | |
1cb2d38c RK |
1728 | if (!err) { |
1729 | if (!nilfs_page_buffers_clean(page)) | |
1730 | __set_page_dirty_nobuffers(page); | |
1731 | ClearPageError(page); | |
1732 | } else { | |
1733 | __set_page_dirty_nobuffers(page); | |
1734 | SetPageError(page); | |
9ff05123 | 1735 | } |
1cb2d38c RK |
1736 | |
1737 | end_page_writeback(page); | |
9ff05123 RK |
1738 | } |
1739 | ||
1cb2d38c | 1740 | static void nilfs_abort_logs(struct list_head *logs, int err) |
9ff05123 RK |
1741 | { |
1742 | struct nilfs_segment_buffer *segbuf; | |
1743 | struct page *bd_page = NULL, *fs_page = NULL; | |
a694291a | 1744 | struct buffer_head *bh; |
9ff05123 | 1745 | |
a694291a RK |
1746 | if (list_empty(logs)) |
1747 | return; | |
9ff05123 | 1748 | |
a694291a | 1749 | list_for_each_entry(segbuf, logs, sb_list) { |
9ff05123 RK |
1750 | list_for_each_entry(bh, &segbuf->sb_segsum_buffers, |
1751 | b_assoc_buffers) { | |
1752 | if (bh->b_page != bd_page) { | |
1753 | if (bd_page) | |
1754 | end_page_writeback(bd_page); | |
1755 | bd_page = bh->b_page; | |
1756 | } | |
1757 | } | |
1758 | ||
1759 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, | |
1760 | b_assoc_buffers) { | |
7f42ec39 | 1761 | clear_buffer_async_write(bh); |
1e2b68bf | 1762 | if (bh == segbuf->sb_super_root) { |
9ff05123 RK |
1763 | if (bh->b_page != bd_page) { |
1764 | end_page_writeback(bd_page); | |
1765 | bd_page = bh->b_page; | |
1766 | } | |
1767 | break; | |
1768 | } | |
1769 | if (bh->b_page != fs_page) { | |
1770 | nilfs_end_page_io(fs_page, err); | |
9ff05123 RK |
1771 | fs_page = bh->b_page; |
1772 | } | |
1773 | } | |
1774 | } | |
1775 | if (bd_page) | |
1776 | end_page_writeback(bd_page); | |
1777 | ||
1778 | nilfs_end_page_io(fs_page, err); | |
a694291a RK |
1779 | } |
1780 | ||
1781 | static void nilfs_segctor_abort_construction(struct nilfs_sc_info *sci, | |
1782 | struct the_nilfs *nilfs, int err) | |
1783 | { | |
1784 | LIST_HEAD(logs); | |
1785 | int ret; | |
1786 | ||
1787 | list_splice_tail_init(&sci->sc_write_logs, &logs); | |
1788 | ret = nilfs_wait_on_logs(&logs); | |
1cb2d38c | 1789 | nilfs_abort_logs(&logs, ret ? : err); |
a694291a RK |
1790 | |
1791 | list_splice_tail_init(&sci->sc_segbufs, &logs); | |
1792 | nilfs_cancel_segusage(&logs, nilfs->ns_sufile); | |
1793 | nilfs_free_incomplete_logs(&logs, nilfs); | |
a694291a RK |
1794 | |
1795 | if (sci->sc_stage.flags & NILFS_CF_SUFREED) { | |
1796 | ret = nilfs_sufile_cancel_freev(nilfs->ns_sufile, | |
1797 | sci->sc_freesegs, | |
1798 | sci->sc_nfreesegs, | |
1799 | NULL); | |
1800 | WARN_ON(ret); /* do not happen */ | |
1801 | } | |
1802 | ||
1803 | nilfs_destroy_logs(&logs); | |
9ff05123 RK |
1804 | } |
1805 | ||
1806 | static void nilfs_set_next_segment(struct the_nilfs *nilfs, | |
1807 | struct nilfs_segment_buffer *segbuf) | |
1808 | { | |
1809 | nilfs->ns_segnum = segbuf->sb_segnum; | |
1810 | nilfs->ns_nextnum = segbuf->sb_nextnum; | |
1811 | nilfs->ns_pseg_offset = segbuf->sb_pseg_start - segbuf->sb_fseg_start | |
1812 | + segbuf->sb_sum.nblocks; | |
1813 | nilfs->ns_seg_seq = segbuf->sb_sum.seg_seq; | |
1814 | nilfs->ns_ctime = segbuf->sb_sum.ctime; | |
1815 | } | |
1816 | ||
1817 | static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci) | |
1818 | { | |
1819 | struct nilfs_segment_buffer *segbuf; | |
1820 | struct page *bd_page = NULL, *fs_page = NULL; | |
e3154e97 | 1821 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
1e2b68bf | 1822 | int update_sr = false; |
9ff05123 | 1823 | |
a694291a | 1824 | list_for_each_entry(segbuf, &sci->sc_write_logs, sb_list) { |
9ff05123 RK |
1825 | struct buffer_head *bh; |
1826 | ||
1827 | list_for_each_entry(bh, &segbuf->sb_segsum_buffers, | |
1828 | b_assoc_buffers) { | |
1829 | set_buffer_uptodate(bh); | |
1830 | clear_buffer_dirty(bh); | |
1831 | if (bh->b_page != bd_page) { | |
1832 | if (bd_page) | |
1833 | end_page_writeback(bd_page); | |
1834 | bd_page = bh->b_page; | |
1835 | } | |
1836 | } | |
1837 | /* | |
1838 | * We assume that the buffers which belong to the same page | |
1839 | * continue over the buffer list. | |
1840 | * Under this assumption, the last BHs of pages is | |
1841 | * identifiable by the discontinuity of bh->b_page | |
1842 | * (page != fs_page). | |
1843 | * | |
1844 | * For B-tree node blocks, however, this assumption is not | |
1845 | * guaranteed. The cleanup code of B-tree node pages needs | |
1846 | * special care. | |
1847 | */ | |
1848 | list_for_each_entry(bh, &segbuf->sb_payload_buffers, | |
1849 | b_assoc_buffers) { | |
4ce5c342 | 1850 | const unsigned long set_bits = BIT(BH_Uptodate); |
ead8ecff | 1851 | const unsigned long clear_bits = |
4ce5c342 RK |
1852 | (BIT(BH_Dirty) | BIT(BH_Async_Write) | |
1853 | BIT(BH_Delay) | BIT(BH_NILFS_Volatile) | | |
1854 | BIT(BH_NILFS_Redirected)); | |
ead8ecff RK |
1855 | |
1856 | set_mask_bits(&bh->b_state, clear_bits, set_bits); | |
1e2b68bf | 1857 | if (bh == segbuf->sb_super_root) { |
9ff05123 RK |
1858 | if (bh->b_page != bd_page) { |
1859 | end_page_writeback(bd_page); | |
1860 | bd_page = bh->b_page; | |
1861 | } | |
1e2b68bf | 1862 | update_sr = true; |
9ff05123 RK |
1863 | break; |
1864 | } | |
1865 | if (bh->b_page != fs_page) { | |
1866 | nilfs_end_page_io(fs_page, 0); | |
1867 | fs_page = bh->b_page; | |
1868 | } | |
1869 | } | |
1870 | ||
4762077c RK |
1871 | if (!nilfs_segbuf_simplex(segbuf)) { |
1872 | if (segbuf->sb_sum.flags & NILFS_SS_LOGBGN) { | |
9ff05123 RK |
1873 | set_bit(NILFS_SC_UNCLOSED, &sci->sc_flags); |
1874 | sci->sc_lseg_stime = jiffies; | |
1875 | } | |
4762077c | 1876 | if (segbuf->sb_sum.flags & NILFS_SS_LOGEND) |
9ff05123 RK |
1877 | clear_bit(NILFS_SC_UNCLOSED, &sci->sc_flags); |
1878 | } | |
1879 | } | |
1880 | /* | |
1881 | * Since pages may continue over multiple segment buffers, | |
1882 | * end of the last page must be checked outside of the loop. | |
1883 | */ | |
1884 | if (bd_page) | |
1885 | end_page_writeback(bd_page); | |
1886 | ||
1887 | nilfs_end_page_io(fs_page, 0); | |
1888 | ||
9ff05123 RK |
1889 | nilfs_drop_collected_inodes(&sci->sc_dirty_files); |
1890 | ||
c1c1d709 | 1891 | if (nilfs_doing_gc()) |
9ff05123 | 1892 | nilfs_drop_collected_inodes(&sci->sc_gc_inodes); |
c1c1d709 | 1893 | else |
9ff05123 | 1894 | nilfs->ns_nongc_ctime = sci->sc_seg_ctime; |
9ff05123 RK |
1895 | |
1896 | sci->sc_nblk_inc += sci->sc_nblk_this_inc; | |
1897 | ||
a694291a | 1898 | segbuf = NILFS_LAST_SEGBUF(&sci->sc_write_logs); |
9ff05123 RK |
1899 | nilfs_set_next_segment(nilfs, segbuf); |
1900 | ||
1901 | if (update_sr) { | |
e2c7617a | 1902 | nilfs->ns_flushed_device = 0; |
9ff05123 | 1903 | nilfs_set_last_segment(nilfs, segbuf->sb_pseg_start, |
e339ad31 | 1904 | segbuf->sb_sum.seg_seq, nilfs->ns_cno++); |
9ff05123 | 1905 | |
c96fa464 | 1906 | clear_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags); |
9ff05123 RK |
1907 | clear_bit(NILFS_SC_DIRTY, &sci->sc_flags); |
1908 | set_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags); | |
a694291a | 1909 | nilfs_segctor_clear_metadata_dirty(sci); |
9ff05123 RK |
1910 | } else |
1911 | clear_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags); | |
1912 | } | |
1913 | ||
a694291a RK |
1914 | static int nilfs_segctor_wait(struct nilfs_sc_info *sci) |
1915 | { | |
1916 | int ret; | |
1917 | ||
1918 | ret = nilfs_wait_on_logs(&sci->sc_write_logs); | |
1919 | if (!ret) { | |
1920 | nilfs_segctor_complete_write(sci); | |
1921 | nilfs_destroy_logs(&sci->sc_write_logs); | |
1922 | } | |
1923 | return ret; | |
1924 | } | |
1925 | ||
693dd321 RK |
1926 | static int nilfs_segctor_collect_dirty_files(struct nilfs_sc_info *sci, |
1927 | struct the_nilfs *nilfs) | |
9ff05123 RK |
1928 | { |
1929 | struct nilfs_inode_info *ii, *n; | |
e912a5b6 | 1930 | struct inode *ifile = sci->sc_root->ifile; |
9ff05123 | 1931 | |
693dd321 | 1932 | spin_lock(&nilfs->ns_inode_lock); |
9ff05123 | 1933 | retry: |
693dd321 | 1934 | list_for_each_entry_safe(ii, n, &nilfs->ns_dirty_files, i_dirty) { |
9ff05123 RK |
1935 | if (!ii->i_bh) { |
1936 | struct buffer_head *ibh; | |
1937 | int err; | |
1938 | ||
693dd321 | 1939 | spin_unlock(&nilfs->ns_inode_lock); |
9ff05123 | 1940 | err = nilfs_ifile_get_inode_block( |
e912a5b6 | 1941 | ifile, ii->vfs_inode.i_ino, &ibh); |
9ff05123 | 1942 | if (unlikely(err)) { |
d6517deb RK |
1943 | nilfs_msg(sci->sc_super, KERN_WARNING, |
1944 | "log writer: error %d getting inode block (ino=%lu)", | |
1945 | err, ii->vfs_inode.i_ino); | |
9ff05123 RK |
1946 | return err; |
1947 | } | |
693dd321 | 1948 | spin_lock(&nilfs->ns_inode_lock); |
9ff05123 RK |
1949 | if (likely(!ii->i_bh)) |
1950 | ii->i_bh = ibh; | |
1951 | else | |
1952 | brelse(ibh); | |
1953 | goto retry; | |
1954 | } | |
9ff05123 | 1955 | |
31ccb1f7 AR |
1956 | // Always redirty the buffer to avoid race condition |
1957 | mark_buffer_dirty(ii->i_bh); | |
1958 | nilfs_mdt_mark_dirty(ifile); | |
1959 | ||
9ff05123 RK |
1960 | clear_bit(NILFS_I_QUEUED, &ii->i_state); |
1961 | set_bit(NILFS_I_BUSY, &ii->i_state); | |
eaae0f37 | 1962 | list_move_tail(&ii->i_dirty, &sci->sc_dirty_files); |
9ff05123 | 1963 | } |
693dd321 | 1964 | spin_unlock(&nilfs->ns_inode_lock); |
9ff05123 | 1965 | |
9ff05123 RK |
1966 | return 0; |
1967 | } | |
1968 | ||
693dd321 RK |
1969 | static void nilfs_segctor_drop_written_files(struct nilfs_sc_info *sci, |
1970 | struct the_nilfs *nilfs) | |
9ff05123 | 1971 | { |
9ff05123 | 1972 | struct nilfs_inode_info *ii, *n; |
1751e8a6 | 1973 | int during_mount = !(sci->sc_super->s_flags & SB_ACTIVE); |
7ef3ff2f | 1974 | int defer_iput = false; |
9ff05123 | 1975 | |
693dd321 | 1976 | spin_lock(&nilfs->ns_inode_lock); |
9ff05123 RK |
1977 | list_for_each_entry_safe(ii, n, &sci->sc_dirty_files, i_dirty) { |
1978 | if (!test_and_clear_bit(NILFS_I_UPDATED, &ii->i_state) || | |
6c43f410 | 1979 | test_bit(NILFS_I_DIRTY, &ii->i_state)) |
9ff05123 | 1980 | continue; |
6c43f410 | 1981 | |
9ff05123 RK |
1982 | clear_bit(NILFS_I_BUSY, &ii->i_state); |
1983 | brelse(ii->i_bh); | |
1984 | ii->i_bh = NULL; | |
7ef3ff2f | 1985 | list_del_init(&ii->i_dirty); |
283ee148 | 1986 | if (!ii->vfs_inode.i_nlink || during_mount) { |
7ef3ff2f | 1987 | /* |
283ee148 RK |
1988 | * Defer calling iput() to avoid deadlocks if |
1989 | * i_nlink == 0 or mount is not yet finished. | |
7ef3ff2f RK |
1990 | */ |
1991 | list_add_tail(&ii->i_dirty, &sci->sc_iput_queue); | |
1992 | defer_iput = true; | |
1993 | } else { | |
1994 | spin_unlock(&nilfs->ns_inode_lock); | |
1995 | iput(&ii->vfs_inode); | |
1996 | spin_lock(&nilfs->ns_inode_lock); | |
1997 | } | |
9ff05123 | 1998 | } |
693dd321 | 1999 | spin_unlock(&nilfs->ns_inode_lock); |
7ef3ff2f RK |
2000 | |
2001 | if (defer_iput) | |
2002 | schedule_work(&sci->sc_iput_work); | |
9ff05123 RK |
2003 | } |
2004 | ||
9ff05123 RK |
2005 | /* |
2006 | * Main procedure of segment constructor | |
2007 | */ | |
2008 | static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode) | |
2009 | { | |
e3154e97 | 2010 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
1e2b68bf | 2011 | int err; |
9ff05123 | 2012 | |
58497703 | 2013 | nilfs_sc_cstage_set(sci, NILFS_ST_INIT); |
6c43f410 | 2014 | sci->sc_cno = nilfs->ns_cno; |
9ff05123 | 2015 | |
693dd321 | 2016 | err = nilfs_segctor_collect_dirty_files(sci, nilfs); |
9ff05123 RK |
2017 | if (unlikely(err)) |
2018 | goto out; | |
2019 | ||
e912a5b6 | 2020 | if (nilfs_test_metadata_dirty(nilfs, sci->sc_root)) |
9ff05123 RK |
2021 | set_bit(NILFS_SC_DIRTY, &sci->sc_flags); |
2022 | ||
2023 | if (nilfs_segctor_clean(sci)) | |
2024 | goto out; | |
2025 | ||
2026 | do { | |
2027 | sci->sc_stage.flags &= ~NILFS_CF_HISTORY_MASK; | |
2028 | ||
2029 | err = nilfs_segctor_begin_construction(sci, nilfs); | |
2030 | if (unlikely(err)) | |
2031 | goto out; | |
2032 | ||
2033 | /* Update time stamp */ | |
fb04b91b | 2034 | sci->sc_seg_ctime = ktime_get_real_seconds(); |
9ff05123 RK |
2035 | |
2036 | err = nilfs_segctor_collect(sci, nilfs, mode); | |
2037 | if (unlikely(err)) | |
2038 | goto failed; | |
2039 | ||
9ff05123 | 2040 | /* Avoid empty segment */ |
58497703 | 2041 | if (nilfs_sc_cstage_get(sci) == NILFS_ST_DONE && |
4762077c | 2042 | nilfs_segbuf_empty(sci->sc_curseg)) { |
a694291a | 2043 | nilfs_segctor_abort_construction(sci, nilfs, 1); |
9ff05123 RK |
2044 | goto out; |
2045 | } | |
2046 | ||
2047 | err = nilfs_segctor_assign(sci, mode); | |
2048 | if (unlikely(err)) | |
2049 | goto failed; | |
2050 | ||
9ff05123 | 2051 | if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED) |
e912a5b6 | 2052 | nilfs_segctor_fill_in_file_bmap(sci); |
9ff05123 | 2053 | |
1e2b68bf | 2054 | if (mode == SC_LSEG_SR && |
58497703 | 2055 | nilfs_sc_cstage_get(sci) >= NILFS_ST_CPFILE) { |
9ff05123 RK |
2056 | err = nilfs_segctor_fill_in_checkpoint(sci); |
2057 | if (unlikely(err)) | |
a694291a | 2058 | goto failed_to_write; |
9ff05123 RK |
2059 | |
2060 | nilfs_segctor_fill_in_super_root(sci, nilfs); | |
2061 | } | |
2062 | nilfs_segctor_update_segusage(sci, nilfs->ns_sufile); | |
2063 | ||
2064 | /* Write partial segments */ | |
1cb2d38c | 2065 | nilfs_segctor_prepare_write(sci); |
aaed1d5b RK |
2066 | |
2067 | nilfs_add_checksums_on_logs(&sci->sc_segbufs, | |
2068 | nilfs->ns_crc_seed); | |
9ff05123 | 2069 | |
9c965bac | 2070 | err = nilfs_segctor_write(sci, nilfs); |
9ff05123 RK |
2071 | if (unlikely(err)) |
2072 | goto failed_to_write; | |
2073 | ||
58497703 | 2074 | if (nilfs_sc_cstage_get(sci) == NILFS_ST_DONE || |
09cbfeaf | 2075 | nilfs->ns_blocksize_bits != PAGE_SHIFT) { |
a694291a RK |
2076 | /* |
2077 | * At this point, we avoid double buffering | |
2078 | * for blocksize < pagesize because page dirty | |
2079 | * flag is turned off during write and dirty | |
2080 | * buffers are not properly collected for | |
2081 | * pages crossing over segments. | |
2082 | */ | |
2083 | err = nilfs_segctor_wait(sci); | |
2084 | if (err) | |
2085 | goto failed_to_write; | |
2086 | } | |
58497703 | 2087 | } while (nilfs_sc_cstage_get(sci) != NILFS_ST_DONE); |
9ff05123 | 2088 | |
9ff05123 | 2089 | out: |
693dd321 | 2090 | nilfs_segctor_drop_written_files(sci, nilfs); |
9ff05123 RK |
2091 | return err; |
2092 | ||
2093 | failed_to_write: | |
9ff05123 RK |
2094 | if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED) |
2095 | nilfs_redirty_inodes(&sci->sc_dirty_files); | |
9ff05123 RK |
2096 | |
2097 | failed: | |
2098 | if (nilfs_doing_gc()) | |
2099 | nilfs_redirty_inodes(&sci->sc_gc_inodes); | |
a694291a | 2100 | nilfs_segctor_abort_construction(sci, nilfs, err); |
9ff05123 RK |
2101 | goto out; |
2102 | } | |
2103 | ||
2104 | /** | |
9ccf56c1 | 2105 | * nilfs_segctor_start_timer - set timer of background write |
9ff05123 RK |
2106 | * @sci: nilfs_sc_info |
2107 | * | |
2108 | * If the timer has already been set, it ignores the new request. | |
2109 | * This function MUST be called within a section locking the segment | |
2110 | * semaphore. | |
2111 | */ | |
2112 | static void nilfs_segctor_start_timer(struct nilfs_sc_info *sci) | |
2113 | { | |
2114 | spin_lock(&sci->sc_state_lock); | |
fdce895e LH |
2115 | if (!(sci->sc_state & NILFS_SEGCTOR_COMMIT)) { |
2116 | sci->sc_timer.expires = jiffies + sci->sc_interval; | |
2117 | add_timer(&sci->sc_timer); | |
9ff05123 RK |
2118 | sci->sc_state |= NILFS_SEGCTOR_COMMIT; |
2119 | } | |
2120 | spin_unlock(&sci->sc_state_lock); | |
2121 | } | |
2122 | ||
2123 | static void nilfs_segctor_do_flush(struct nilfs_sc_info *sci, int bn) | |
2124 | { | |
2125 | spin_lock(&sci->sc_state_lock); | |
4ce5c342 | 2126 | if (!(sci->sc_flush_request & BIT(bn))) { |
9ff05123 RK |
2127 | unsigned long prev_req = sci->sc_flush_request; |
2128 | ||
4ce5c342 | 2129 | sci->sc_flush_request |= BIT(bn); |
9ff05123 RK |
2130 | if (!prev_req) |
2131 | wake_up(&sci->sc_wait_daemon); | |
2132 | } | |
2133 | spin_unlock(&sci->sc_state_lock); | |
2134 | } | |
2135 | ||
2136 | /** | |
2137 | * nilfs_flush_segment - trigger a segment construction for resource control | |
2138 | * @sb: super block | |
2139 | * @ino: inode number of the file to be flushed out. | |
2140 | */ | |
2141 | void nilfs_flush_segment(struct super_block *sb, ino_t ino) | |
2142 | { | |
e3154e97 | 2143 | struct the_nilfs *nilfs = sb->s_fs_info; |
3fd3fe5a | 2144 | struct nilfs_sc_info *sci = nilfs->ns_writer; |
9ff05123 RK |
2145 | |
2146 | if (!sci || nilfs_doing_construction()) | |
2147 | return; | |
2148 | nilfs_segctor_do_flush(sci, NILFS_MDT_INODE(sb, ino) ? ino : 0); | |
2149 | /* assign bit 0 to data files */ | |
2150 | } | |
2151 | ||
9ff05123 | 2152 | struct nilfs_segctor_wait_request { |
ac6424b9 | 2153 | wait_queue_entry_t wq; |
9ff05123 RK |
2154 | __u32 seq; |
2155 | int err; | |
2156 | atomic_t done; | |
2157 | }; | |
2158 | ||
2159 | static int nilfs_segctor_sync(struct nilfs_sc_info *sci) | |
2160 | { | |
2161 | struct nilfs_segctor_wait_request wait_req; | |
2162 | int err = 0; | |
2163 | ||
2164 | spin_lock(&sci->sc_state_lock); | |
2165 | init_wait(&wait_req.wq); | |
2166 | wait_req.err = 0; | |
2167 | atomic_set(&wait_req.done, 0); | |
2168 | wait_req.seq = ++sci->sc_seq_request; | |
2169 | spin_unlock(&sci->sc_state_lock); | |
2170 | ||
2171 | init_waitqueue_entry(&wait_req.wq, current); | |
2172 | add_wait_queue(&sci->sc_wait_request, &wait_req.wq); | |
2173 | set_current_state(TASK_INTERRUPTIBLE); | |
2174 | wake_up(&sci->sc_wait_daemon); | |
2175 | ||
2176 | for (;;) { | |
2177 | if (atomic_read(&wait_req.done)) { | |
2178 | err = wait_req.err; | |
2179 | break; | |
2180 | } | |
2181 | if (!signal_pending(current)) { | |
2182 | schedule(); | |
2183 | continue; | |
2184 | } | |
2185 | err = -ERESTARTSYS; | |
2186 | break; | |
2187 | } | |
2188 | finish_wait(&sci->sc_wait_request, &wait_req.wq); | |
2189 | return err; | |
2190 | } | |
2191 | ||
2192 | static void nilfs_segctor_wakeup(struct nilfs_sc_info *sci, int err) | |
2193 | { | |
2194 | struct nilfs_segctor_wait_request *wrq, *n; | |
2195 | unsigned long flags; | |
2196 | ||
2197 | spin_lock_irqsave(&sci->sc_wait_request.lock, flags); | |
2055da97 | 2198 | list_for_each_entry_safe(wrq, n, &sci->sc_wait_request.head, wq.entry) { |
9ff05123 RK |
2199 | if (!atomic_read(&wrq->done) && |
2200 | nilfs_cnt32_ge(sci->sc_seq_done, wrq->seq)) { | |
2201 | wrq->err = err; | |
2202 | atomic_set(&wrq->done, 1); | |
2203 | } | |
2204 | if (atomic_read(&wrq->done)) { | |
2205 | wrq->wq.func(&wrq->wq, | |
2206 | TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, | |
2207 | 0, NULL); | |
2208 | } | |
2209 | } | |
2210 | spin_unlock_irqrestore(&sci->sc_wait_request.lock, flags); | |
2211 | } | |
2212 | ||
2213 | /** | |
2214 | * nilfs_construct_segment - construct a logical segment | |
2215 | * @sb: super block | |
2216 | * | |
2217 | * Return Value: On success, 0 is retured. On errors, one of the following | |
2218 | * negative error code is returned. | |
2219 | * | |
2220 | * %-EROFS - Read only filesystem. | |
2221 | * | |
2222 | * %-EIO - I/O error | |
2223 | * | |
2224 | * %-ENOSPC - No space left on device (only in a panic state). | |
2225 | * | |
2226 | * %-ERESTARTSYS - Interrupted. | |
2227 | * | |
2228 | * %-ENOMEM - Insufficient memory available. | |
2229 | */ | |
2230 | int nilfs_construct_segment(struct super_block *sb) | |
2231 | { | |
e3154e97 | 2232 | struct the_nilfs *nilfs = sb->s_fs_info; |
3fd3fe5a | 2233 | struct nilfs_sc_info *sci = nilfs->ns_writer; |
9ff05123 RK |
2234 | struct nilfs_transaction_info *ti; |
2235 | int err; | |
2236 | ||
2237 | if (!sci) | |
2238 | return -EROFS; | |
2239 | ||
2240 | /* A call inside transactions causes a deadlock. */ | |
2241 | BUG_ON((ti = current->journal_info) && ti->ti_magic == NILFS_TI_MAGIC); | |
2242 | ||
2243 | err = nilfs_segctor_sync(sci); | |
2244 | return err; | |
2245 | } | |
2246 | ||
2247 | /** | |
2248 | * nilfs_construct_dsync_segment - construct a data-only logical segment | |
2249 | * @sb: super block | |
f30bf3e4 RK |
2250 | * @inode: inode whose data blocks should be written out |
2251 | * @start: start byte offset | |
2252 | * @end: end byte offset (inclusive) | |
9ff05123 RK |
2253 | * |
2254 | * Return Value: On success, 0 is retured. On errors, one of the following | |
2255 | * negative error code is returned. | |
2256 | * | |
2257 | * %-EROFS - Read only filesystem. | |
2258 | * | |
2259 | * %-EIO - I/O error | |
2260 | * | |
2261 | * %-ENOSPC - No space left on device (only in a panic state). | |
2262 | * | |
2263 | * %-ERESTARTSYS - Interrupted. | |
2264 | * | |
2265 | * %-ENOMEM - Insufficient memory available. | |
2266 | */ | |
f30bf3e4 RK |
2267 | int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode, |
2268 | loff_t start, loff_t end) | |
9ff05123 | 2269 | { |
e3154e97 | 2270 | struct the_nilfs *nilfs = sb->s_fs_info; |
3fd3fe5a | 2271 | struct nilfs_sc_info *sci = nilfs->ns_writer; |
9ff05123 RK |
2272 | struct nilfs_inode_info *ii; |
2273 | struct nilfs_transaction_info ti; | |
2274 | int err = 0; | |
2275 | ||
2276 | if (!sci) | |
2277 | return -EROFS; | |
2278 | ||
f7545144 | 2279 | nilfs_transaction_lock(sb, &ti, 0); |
9ff05123 RK |
2280 | |
2281 | ii = NILFS_I(inode); | |
b9f66140 | 2282 | if (test_bit(NILFS_I_INODE_SYNC, &ii->i_state) || |
3b2ce58b | 2283 | nilfs_test_opt(nilfs, STRICT_ORDER) || |
9ff05123 | 2284 | test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) || |
3b2ce58b | 2285 | nilfs_discontinued(nilfs)) { |
f7545144 | 2286 | nilfs_transaction_unlock(sb); |
9ff05123 RK |
2287 | err = nilfs_segctor_sync(sci); |
2288 | return err; | |
2289 | } | |
2290 | ||
693dd321 | 2291 | spin_lock(&nilfs->ns_inode_lock); |
9ff05123 RK |
2292 | if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && |
2293 | !test_bit(NILFS_I_BUSY, &ii->i_state)) { | |
693dd321 | 2294 | spin_unlock(&nilfs->ns_inode_lock); |
f7545144 | 2295 | nilfs_transaction_unlock(sb); |
9ff05123 RK |
2296 | return 0; |
2297 | } | |
693dd321 | 2298 | spin_unlock(&nilfs->ns_inode_lock); |
f30bf3e4 RK |
2299 | sci->sc_dsync_inode = ii; |
2300 | sci->sc_dsync_start = start; | |
2301 | sci->sc_dsync_end = end; | |
9ff05123 RK |
2302 | |
2303 | err = nilfs_segctor_do_construct(sci, SC_LSEG_DSYNC); | |
e2c7617a AR |
2304 | if (!err) |
2305 | nilfs->ns_flushed_device = 0; | |
9ff05123 | 2306 | |
f7545144 | 2307 | nilfs_transaction_unlock(sb); |
9ff05123 RK |
2308 | return err; |
2309 | } | |
2310 | ||
9ff05123 | 2311 | #define FLUSH_FILE_BIT (0x1) /* data file only */ |
4ce5c342 | 2312 | #define FLUSH_DAT_BIT BIT(NILFS_DAT_INO) /* DAT only */ |
9ff05123 | 2313 | |
dcd76186 RK |
2314 | /** |
2315 | * nilfs_segctor_accept - record accepted sequence count of log-write requests | |
2316 | * @sci: segment constructor object | |
2317 | */ | |
2318 | static void nilfs_segctor_accept(struct nilfs_sc_info *sci) | |
9ff05123 | 2319 | { |
9ff05123 | 2320 | spin_lock(&sci->sc_state_lock); |
dcd76186 | 2321 | sci->sc_seq_accepted = sci->sc_seq_request; |
9ff05123 | 2322 | spin_unlock(&sci->sc_state_lock); |
fdce895e | 2323 | del_timer_sync(&sci->sc_timer); |
9ff05123 RK |
2324 | } |
2325 | ||
dcd76186 RK |
2326 | /** |
2327 | * nilfs_segctor_notify - notify the result of request to caller threads | |
2328 | * @sci: segment constructor object | |
2329 | * @mode: mode of log forming | |
2330 | * @err: error code to be notified | |
2331 | */ | |
2332 | static void nilfs_segctor_notify(struct nilfs_sc_info *sci, int mode, int err) | |
9ff05123 RK |
2333 | { |
2334 | /* Clear requests (even when the construction failed) */ | |
2335 | spin_lock(&sci->sc_state_lock); | |
2336 | ||
dcd76186 | 2337 | if (mode == SC_LSEG_SR) { |
aeda7f63 | 2338 | sci->sc_state &= ~NILFS_SEGCTOR_COMMIT; |
dcd76186 RK |
2339 | sci->sc_seq_done = sci->sc_seq_accepted; |
2340 | nilfs_segctor_wakeup(sci, err); | |
9ff05123 | 2341 | sci->sc_flush_request = 0; |
aeda7f63 | 2342 | } else { |
dcd76186 | 2343 | if (mode == SC_FLUSH_FILE) |
aeda7f63 | 2344 | sci->sc_flush_request &= ~FLUSH_FILE_BIT; |
dcd76186 | 2345 | else if (mode == SC_FLUSH_DAT) |
aeda7f63 RK |
2346 | sci->sc_flush_request &= ~FLUSH_DAT_BIT; |
2347 | ||
2348 | /* re-enable timer if checkpoint creation was not done */ | |
fdce895e LH |
2349 | if ((sci->sc_state & NILFS_SEGCTOR_COMMIT) && |
2350 | time_before(jiffies, sci->sc_timer.expires)) | |
2351 | add_timer(&sci->sc_timer); | |
aeda7f63 | 2352 | } |
9ff05123 RK |
2353 | spin_unlock(&sci->sc_state_lock); |
2354 | } | |
2355 | ||
dcd76186 RK |
2356 | /** |
2357 | * nilfs_segctor_construct - form logs and write them to disk | |
2358 | * @sci: segment constructor object | |
2359 | * @mode: mode of log forming | |
2360 | */ | |
2361 | static int nilfs_segctor_construct(struct nilfs_sc_info *sci, int mode) | |
9ff05123 | 2362 | { |
e3154e97 | 2363 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
d26493b6 | 2364 | struct nilfs_super_block **sbp; |
9ff05123 RK |
2365 | int err = 0; |
2366 | ||
dcd76186 RK |
2367 | nilfs_segctor_accept(sci); |
2368 | ||
9ff05123 | 2369 | if (nilfs_discontinued(nilfs)) |
dcd76186 RK |
2370 | mode = SC_LSEG_SR; |
2371 | if (!nilfs_segctor_confirm(sci)) | |
2372 | err = nilfs_segctor_do_construct(sci, mode); | |
2373 | ||
9ff05123 | 2374 | if (likely(!err)) { |
dcd76186 | 2375 | if (mode != SC_FLUSH_DAT) |
9ff05123 RK |
2376 | atomic_set(&nilfs->ns_ndirtyblks, 0); |
2377 | if (test_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags) && | |
2378 | nilfs_discontinued(nilfs)) { | |
2379 | down_write(&nilfs->ns_sem); | |
d26493b6 | 2380 | err = -EIO; |
f7545144 | 2381 | sbp = nilfs_prepare_super(sci->sc_super, |
b2ac86e1 JS |
2382 | nilfs_sb_will_flip(nilfs)); |
2383 | if (likely(sbp)) { | |
2384 | nilfs_set_log_cursor(sbp[0], nilfs); | |
f7545144 RK |
2385 | err = nilfs_commit_super(sci->sc_super, |
2386 | NILFS_SB_COMMIT); | |
b2ac86e1 | 2387 | } |
9ff05123 RK |
2388 | up_write(&nilfs->ns_sem); |
2389 | } | |
2390 | } | |
dcd76186 RK |
2391 | |
2392 | nilfs_segctor_notify(sci, mode, err); | |
9ff05123 RK |
2393 | return err; |
2394 | } | |
2395 | ||
7554e9c4 | 2396 | static void nilfs_construction_timeout(struct timer_list *t) |
9ff05123 | 2397 | { |
7554e9c4 | 2398 | struct nilfs_sc_info *sci = from_timer(sci, t, sc_timer); |
4ad364ca | 2399 | |
7554e9c4 | 2400 | wake_up_process(sci->sc_timer_task); |
9ff05123 RK |
2401 | } |
2402 | ||
2403 | static void | |
2404 | nilfs_remove_written_gcinodes(struct the_nilfs *nilfs, struct list_head *head) | |
2405 | { | |
2406 | struct nilfs_inode_info *ii, *n; | |
2407 | ||
2408 | list_for_each_entry_safe(ii, n, head, i_dirty) { | |
2409 | if (!test_bit(NILFS_I_UPDATED, &ii->i_state)) | |
2410 | continue; | |
9ff05123 | 2411 | list_del_init(&ii->i_dirty); |
fbb24a3a RK |
2412 | truncate_inode_pages(&ii->vfs_inode.i_data, 0); |
2413 | nilfs_btnode_cache_clear(&ii->i_btnode_cache); | |
263d90ce | 2414 | iput(&ii->vfs_inode); |
9ff05123 RK |
2415 | } |
2416 | } | |
2417 | ||
4f6b8288 RK |
2418 | int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv, |
2419 | void **kbufs) | |
9ff05123 | 2420 | { |
e3154e97 | 2421 | struct the_nilfs *nilfs = sb->s_fs_info; |
3fd3fe5a | 2422 | struct nilfs_sc_info *sci = nilfs->ns_writer; |
9ff05123 | 2423 | struct nilfs_transaction_info ti; |
9ff05123 RK |
2424 | int err; |
2425 | ||
2426 | if (unlikely(!sci)) | |
2427 | return -EROFS; | |
2428 | ||
f7545144 | 2429 | nilfs_transaction_lock(sb, &ti, 1); |
9ff05123 | 2430 | |
c1c1d709 | 2431 | err = nilfs_mdt_save_to_shadow_map(nilfs->ns_dat); |
9ff05123 RK |
2432 | if (unlikely(err)) |
2433 | goto out_unlock; | |
071cb4b8 | 2434 | |
4f6b8288 | 2435 | err = nilfs_ioctl_prepare_clean_segments(nilfs, argv, kbufs); |
c1c1d709 RK |
2436 | if (unlikely(err)) { |
2437 | nilfs_mdt_restore_from_shadow_map(nilfs->ns_dat); | |
9ff05123 | 2438 | goto out_unlock; |
c1c1d709 | 2439 | } |
9ff05123 | 2440 | |
071cb4b8 RK |
2441 | sci->sc_freesegs = kbufs[4]; |
2442 | sci->sc_nfreesegs = argv[4].v_nmembs; | |
0935db74 | 2443 | list_splice_tail_init(&nilfs->ns_gc_inodes, &sci->sc_gc_inodes); |
9ff05123 RK |
2444 | |
2445 | for (;;) { | |
dcd76186 | 2446 | err = nilfs_segctor_construct(sci, SC_LSEG_SR); |
9ff05123 | 2447 | nilfs_remove_written_gcinodes(nilfs, &sci->sc_gc_inodes); |
9ff05123 RK |
2448 | |
2449 | if (likely(!err)) | |
2450 | break; | |
2451 | ||
d6517deb | 2452 | nilfs_msg(sb, KERN_WARNING, "error %d cleaning segments", err); |
9ff05123 RK |
2453 | set_current_state(TASK_INTERRUPTIBLE); |
2454 | schedule_timeout(sci->sc_interval); | |
2455 | } | |
3b2ce58b | 2456 | if (nilfs_test_opt(nilfs, DISCARD)) { |
e902ec99 JS |
2457 | int ret = nilfs_discard_segments(nilfs, sci->sc_freesegs, |
2458 | sci->sc_nfreesegs); | |
2459 | if (ret) { | |
feee880f RK |
2460 | nilfs_msg(sb, KERN_WARNING, |
2461 | "error %d on discard request, turning discards off for the device", | |
2462 | ret); | |
3b2ce58b | 2463 | nilfs_clear_opt(nilfs, DISCARD); |
e902ec99 JS |
2464 | } |
2465 | } | |
9ff05123 RK |
2466 | |
2467 | out_unlock: | |
071cb4b8 RK |
2468 | sci->sc_freesegs = NULL; |
2469 | sci->sc_nfreesegs = 0; | |
c1c1d709 | 2470 | nilfs_mdt_clear_shadow_map(nilfs->ns_dat); |
f7545144 | 2471 | nilfs_transaction_unlock(sb); |
9ff05123 RK |
2472 | return err; |
2473 | } | |
2474 | ||
2475 | static void nilfs_segctor_thread_construct(struct nilfs_sc_info *sci, int mode) | |
2476 | { | |
9ff05123 | 2477 | struct nilfs_transaction_info ti; |
9ff05123 | 2478 | |
f7545144 | 2479 | nilfs_transaction_lock(sci->sc_super, &ti, 0); |
dcd76186 | 2480 | nilfs_segctor_construct(sci, mode); |
9ff05123 RK |
2481 | |
2482 | /* | |
2483 | * Unclosed segment should be retried. We do this using sc_timer. | |
2484 | * Timeout of sc_timer will invoke complete construction which leads | |
2485 | * to close the current logical segment. | |
2486 | */ | |
2487 | if (test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) | |
2488 | nilfs_segctor_start_timer(sci); | |
2489 | ||
f7545144 | 2490 | nilfs_transaction_unlock(sci->sc_super); |
9ff05123 RK |
2491 | } |
2492 | ||
2493 | static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *sci) | |
2494 | { | |
2495 | int mode = 0; | |
9ff05123 RK |
2496 | |
2497 | spin_lock(&sci->sc_state_lock); | |
2498 | mode = (sci->sc_flush_request & FLUSH_DAT_BIT) ? | |
2499 | SC_FLUSH_DAT : SC_FLUSH_FILE; | |
2500 | spin_unlock(&sci->sc_state_lock); | |
2501 | ||
2502 | if (mode) { | |
09ef29e0 | 2503 | nilfs_segctor_do_construct(sci, mode); |
9ff05123 RK |
2504 | |
2505 | spin_lock(&sci->sc_state_lock); | |
2506 | sci->sc_flush_request &= (mode == SC_FLUSH_FILE) ? | |
2507 | ~FLUSH_FILE_BIT : ~FLUSH_DAT_BIT; | |
2508 | spin_unlock(&sci->sc_state_lock); | |
2509 | } | |
2510 | clear_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags); | |
2511 | } | |
2512 | ||
2513 | static int nilfs_segctor_flush_mode(struct nilfs_sc_info *sci) | |
2514 | { | |
2515 | if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) || | |
2516 | time_before(jiffies, sci->sc_lseg_stime + sci->sc_mjcp_freq)) { | |
2517 | if (!(sci->sc_flush_request & ~FLUSH_FILE_BIT)) | |
2518 | return SC_FLUSH_FILE; | |
2519 | else if (!(sci->sc_flush_request & ~FLUSH_DAT_BIT)) | |
2520 | return SC_FLUSH_DAT; | |
2521 | } | |
2522 | return SC_LSEG_SR; | |
2523 | } | |
2524 | ||
2525 | /** | |
2526 | * nilfs_segctor_thread - main loop of the segment constructor thread. | |
2527 | * @arg: pointer to a struct nilfs_sc_info. | |
2528 | * | |
2529 | * nilfs_segctor_thread() initializes a timer and serves as a daemon | |
2530 | * to execute segment constructions. | |
2531 | */ | |
2532 | static int nilfs_segctor_thread(void *arg) | |
2533 | { | |
2534 | struct nilfs_sc_info *sci = (struct nilfs_sc_info *)arg; | |
e3154e97 | 2535 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123 RK |
2536 | int timeout = 0; |
2537 | ||
7554e9c4 | 2538 | sci->sc_timer_task = current; |
9ff05123 RK |
2539 | |
2540 | /* start sync. */ | |
2541 | sci->sc_task = current; | |
2542 | wake_up(&sci->sc_wait_task); /* for nilfs_segctor_start_thread() */ | |
feee880f RK |
2543 | nilfs_msg(sci->sc_super, KERN_INFO, |
2544 | "segctord starting. Construction interval = %lu seconds, CP frequency < %lu seconds", | |
2545 | sci->sc_interval / HZ, sci->sc_mjcp_freq / HZ); | |
9ff05123 RK |
2546 | |
2547 | spin_lock(&sci->sc_state_lock); | |
2548 | loop: | |
2549 | for (;;) { | |
2550 | int mode; | |
2551 | ||
2552 | if (sci->sc_state & NILFS_SEGCTOR_QUIT) | |
2553 | goto end_thread; | |
2554 | ||
2555 | if (timeout || sci->sc_seq_request != sci->sc_seq_done) | |
2556 | mode = SC_LSEG_SR; | |
7f00184e | 2557 | else if (sci->sc_flush_request) |
9ff05123 | 2558 | mode = nilfs_segctor_flush_mode(sci); |
7f00184e RK |
2559 | else |
2560 | break; | |
9ff05123 RK |
2561 | |
2562 | spin_unlock(&sci->sc_state_lock); | |
2563 | nilfs_segctor_thread_construct(sci, mode); | |
2564 | spin_lock(&sci->sc_state_lock); | |
2565 | timeout = 0; | |
2566 | } | |
2567 | ||
2568 | ||
2569 | if (freezing(current)) { | |
2570 | spin_unlock(&sci->sc_state_lock); | |
a0acae0e | 2571 | try_to_freeze(); |
9ff05123 RK |
2572 | spin_lock(&sci->sc_state_lock); |
2573 | } else { | |
2574 | DEFINE_WAIT(wait); | |
2575 | int should_sleep = 1; | |
2576 | ||
2577 | prepare_to_wait(&sci->sc_wait_daemon, &wait, | |
2578 | TASK_INTERRUPTIBLE); | |
2579 | ||
2580 | if (sci->sc_seq_request != sci->sc_seq_done) | |
2581 | should_sleep = 0; | |
2582 | else if (sci->sc_flush_request) | |
2583 | should_sleep = 0; | |
2584 | else if (sci->sc_state & NILFS_SEGCTOR_COMMIT) | |
2585 | should_sleep = time_before(jiffies, | |
fdce895e | 2586 | sci->sc_timer.expires); |
9ff05123 RK |
2587 | |
2588 | if (should_sleep) { | |
2589 | spin_unlock(&sci->sc_state_lock); | |
2590 | schedule(); | |
2591 | spin_lock(&sci->sc_state_lock); | |
2592 | } | |
2593 | finish_wait(&sci->sc_wait_daemon, &wait); | |
2594 | timeout = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) && | |
fdce895e | 2595 | time_after_eq(jiffies, sci->sc_timer.expires)); |
e605f0a7 RK |
2596 | |
2597 | if (nilfs_sb_dirty(nilfs) && nilfs_sb_need_update(nilfs)) | |
1dfa2710 | 2598 | set_nilfs_discontinued(nilfs); |
9ff05123 RK |
2599 | } |
2600 | goto loop; | |
2601 | ||
2602 | end_thread: | |
2603 | spin_unlock(&sci->sc_state_lock); | |
9ff05123 RK |
2604 | |
2605 | /* end sync. */ | |
2606 | sci->sc_task = NULL; | |
2607 | wake_up(&sci->sc_wait_task); /* for nilfs_segctor_kill_thread() */ | |
2608 | return 0; | |
2609 | } | |
2610 | ||
2611 | static int nilfs_segctor_start_thread(struct nilfs_sc_info *sci) | |
2612 | { | |
2613 | struct task_struct *t; | |
2614 | ||
2615 | t = kthread_run(nilfs_segctor_thread, sci, "segctord"); | |
2616 | if (IS_ERR(t)) { | |
2617 | int err = PTR_ERR(t); | |
2618 | ||
feee880f RK |
2619 | nilfs_msg(sci->sc_super, KERN_ERR, |
2620 | "error %d creating segctord thread", err); | |
9ff05123 RK |
2621 | return err; |
2622 | } | |
2623 | wait_event(sci->sc_wait_task, sci->sc_task != NULL); | |
2624 | return 0; | |
2625 | } | |
2626 | ||
2627 | static void nilfs_segctor_kill_thread(struct nilfs_sc_info *sci) | |
6b81e14e JS |
2628 | __acquires(&sci->sc_state_lock) |
2629 | __releases(&sci->sc_state_lock) | |
9ff05123 RK |
2630 | { |
2631 | sci->sc_state |= NILFS_SEGCTOR_QUIT; | |
2632 | ||
2633 | while (sci->sc_task) { | |
2634 | wake_up(&sci->sc_wait_daemon); | |
2635 | spin_unlock(&sci->sc_state_lock); | |
2636 | wait_event(sci->sc_wait_task, sci->sc_task == NULL); | |
2637 | spin_lock(&sci->sc_state_lock); | |
2638 | } | |
2639 | } | |
2640 | ||
9ff05123 RK |
2641 | /* |
2642 | * Setup & clean-up functions | |
2643 | */ | |
f7545144 | 2644 | static struct nilfs_sc_info *nilfs_segctor_new(struct super_block *sb, |
e912a5b6 | 2645 | struct nilfs_root *root) |
9ff05123 | 2646 | { |
e3154e97 | 2647 | struct the_nilfs *nilfs = sb->s_fs_info; |
9ff05123 RK |
2648 | struct nilfs_sc_info *sci; |
2649 | ||
2650 | sci = kzalloc(sizeof(*sci), GFP_KERNEL); | |
2651 | if (!sci) | |
2652 | return NULL; | |
2653 | ||
f7545144 | 2654 | sci->sc_super = sb; |
9ff05123 | 2655 | |
e912a5b6 RK |
2656 | nilfs_get_root(root); |
2657 | sci->sc_root = root; | |
2658 | ||
9ff05123 RK |
2659 | init_waitqueue_head(&sci->sc_wait_request); |
2660 | init_waitqueue_head(&sci->sc_wait_daemon); | |
2661 | init_waitqueue_head(&sci->sc_wait_task); | |
2662 | spin_lock_init(&sci->sc_state_lock); | |
2663 | INIT_LIST_HEAD(&sci->sc_dirty_files); | |
2664 | INIT_LIST_HEAD(&sci->sc_segbufs); | |
a694291a | 2665 | INIT_LIST_HEAD(&sci->sc_write_logs); |
9ff05123 | 2666 | INIT_LIST_HEAD(&sci->sc_gc_inodes); |
7ef3ff2f RK |
2667 | INIT_LIST_HEAD(&sci->sc_iput_queue); |
2668 | INIT_WORK(&sci->sc_iput_work, nilfs_iput_work_func); | |
7554e9c4 | 2669 | timer_setup(&sci->sc_timer, nilfs_construction_timeout, 0); |
9ff05123 RK |
2670 | |
2671 | sci->sc_interval = HZ * NILFS_SC_DEFAULT_TIMEOUT; | |
2672 | sci->sc_mjcp_freq = HZ * NILFS_SC_DEFAULT_SR_FREQ; | |
2673 | sci->sc_watermark = NILFS_SC_DEFAULT_WATERMARK; | |
2674 | ||
574e6c31 | 2675 | if (nilfs->ns_interval) |
071d73cf | 2676 | sci->sc_interval = HZ * nilfs->ns_interval; |
574e6c31 RK |
2677 | if (nilfs->ns_watermark) |
2678 | sci->sc_watermark = nilfs->ns_watermark; | |
9ff05123 RK |
2679 | return sci; |
2680 | } | |
2681 | ||
2682 | static void nilfs_segctor_write_out(struct nilfs_sc_info *sci) | |
2683 | { | |
2684 | int ret, retrycount = NILFS_SC_CLEANUP_RETRY; | |
2685 | ||
076a378b RK |
2686 | /* |
2687 | * The segctord thread was stopped and its timer was removed. | |
2688 | * But some tasks remain. | |
2689 | */ | |
9ff05123 | 2690 | do { |
9ff05123 | 2691 | struct nilfs_transaction_info ti; |
9ff05123 | 2692 | |
f7545144 | 2693 | nilfs_transaction_lock(sci->sc_super, &ti, 0); |
dcd76186 | 2694 | ret = nilfs_segctor_construct(sci, SC_LSEG_SR); |
f7545144 | 2695 | nilfs_transaction_unlock(sci->sc_super); |
9ff05123 | 2696 | |
7ef3ff2f RK |
2697 | flush_work(&sci->sc_iput_work); |
2698 | ||
9ff05123 RK |
2699 | } while (ret && retrycount-- > 0); |
2700 | } | |
2701 | ||
2702 | /** | |
2703 | * nilfs_segctor_destroy - destroy the segment constructor. | |
2704 | * @sci: nilfs_sc_info | |
2705 | * | |
2706 | * nilfs_segctor_destroy() kills the segctord thread and frees | |
2707 | * the nilfs_sc_info struct. | |
2708 | * Caller must hold the segment semaphore. | |
2709 | */ | |
2710 | static void nilfs_segctor_destroy(struct nilfs_sc_info *sci) | |
2711 | { | |
e3154e97 | 2712 | struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123 RK |
2713 | int flag; |
2714 | ||
693dd321 | 2715 | up_write(&nilfs->ns_segctor_sem); |
9ff05123 RK |
2716 | |
2717 | spin_lock(&sci->sc_state_lock); | |
2718 | nilfs_segctor_kill_thread(sci); | |
2719 | flag = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) || sci->sc_flush_request | |
2720 | || sci->sc_seq_request != sci->sc_seq_done); | |
2721 | spin_unlock(&sci->sc_state_lock); | |
2722 | ||
7ef3ff2f RK |
2723 | if (flush_work(&sci->sc_iput_work)) |
2724 | flag = true; | |
2725 | ||
3256a055 | 2726 | if (flag || !nilfs_segctor_confirm(sci)) |
9ff05123 RK |
2727 | nilfs_segctor_write_out(sci); |
2728 | ||
9ff05123 | 2729 | if (!list_empty(&sci->sc_dirty_files)) { |
d6517deb RK |
2730 | nilfs_msg(sci->sc_super, KERN_WARNING, |
2731 | "disposed unprocessed dirty file(s) when stopping log writer"); | |
693dd321 | 2732 | nilfs_dispose_list(nilfs, &sci->sc_dirty_files, 1); |
9ff05123 | 2733 | } |
9ff05123 | 2734 | |
7ef3ff2f | 2735 | if (!list_empty(&sci->sc_iput_queue)) { |
d6517deb RK |
2736 | nilfs_msg(sci->sc_super, KERN_WARNING, |
2737 | "disposed unprocessed inode(s) in iput queue when stopping log writer"); | |
7ef3ff2f RK |
2738 | nilfs_dispose_list(nilfs, &sci->sc_iput_queue, 1); |
2739 | } | |
2740 | ||
1f5abe7e | 2741 | WARN_ON(!list_empty(&sci->sc_segbufs)); |
a694291a | 2742 | WARN_ON(!list_empty(&sci->sc_write_logs)); |
9ff05123 | 2743 | |
e912a5b6 RK |
2744 | nilfs_put_root(sci->sc_root); |
2745 | ||
693dd321 | 2746 | down_write(&nilfs->ns_segctor_sem); |
9ff05123 | 2747 | |
fdce895e | 2748 | del_timer_sync(&sci->sc_timer); |
9ff05123 RK |
2749 | kfree(sci); |
2750 | } | |
2751 | ||
2752 | /** | |
f7545144 RK |
2753 | * nilfs_attach_log_writer - attach log writer |
2754 | * @sb: super block instance | |
e912a5b6 | 2755 | * @root: root object of the current filesystem tree |
9ff05123 | 2756 | * |
f7545144 RK |
2757 | * This allocates a log writer object, initializes it, and starts the |
2758 | * log writer. | |
9ff05123 RK |
2759 | * |
2760 | * Return Value: On success, 0 is returned. On error, one of the following | |
2761 | * negative error code is returned. | |
2762 | * | |
2763 | * %-ENOMEM - Insufficient memory available. | |
2764 | */ | |
f7545144 | 2765 | int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root) |
9ff05123 | 2766 | { |
e3154e97 | 2767 | struct the_nilfs *nilfs = sb->s_fs_info; |
9ff05123 RK |
2768 | int err; |
2769 | ||
3fd3fe5a | 2770 | if (nilfs->ns_writer) { |
fe5f171b RK |
2771 | /* |
2772 | * This happens if the filesystem was remounted | |
2773 | * read/write after nilfs_error degenerated it into a | |
2774 | * read-only mount. | |
2775 | */ | |
f7545144 | 2776 | nilfs_detach_log_writer(sb); |
fe5f171b RK |
2777 | } |
2778 | ||
f7545144 | 2779 | nilfs->ns_writer = nilfs_segctor_new(sb, root); |
3fd3fe5a | 2780 | if (!nilfs->ns_writer) |
9ff05123 RK |
2781 | return -ENOMEM; |
2782 | ||
59a4c8e0 RK |
2783 | inode_attach_wb(nilfs->ns_bdev->bd_inode, NULL); |
2784 | ||
3fd3fe5a | 2785 | err = nilfs_segctor_start_thread(nilfs->ns_writer); |
9ff05123 | 2786 | if (err) { |
3fd3fe5a RK |
2787 | kfree(nilfs->ns_writer); |
2788 | nilfs->ns_writer = NULL; | |
9ff05123 RK |
2789 | } |
2790 | return err; | |
2791 | } | |
2792 | ||
2793 | /** | |
f7545144 RK |
2794 | * nilfs_detach_log_writer - destroy log writer |
2795 | * @sb: super block instance | |
9ff05123 | 2796 | * |
f7545144 RK |
2797 | * This kills log writer daemon, frees the log writer object, and |
2798 | * destroys list of dirty files. | |
9ff05123 | 2799 | */ |
f7545144 | 2800 | void nilfs_detach_log_writer(struct super_block *sb) |
9ff05123 | 2801 | { |
e3154e97 | 2802 | struct the_nilfs *nilfs = sb->s_fs_info; |
9ff05123 RK |
2803 | LIST_HEAD(garbage_list); |
2804 | ||
2805 | down_write(&nilfs->ns_segctor_sem); | |
3fd3fe5a RK |
2806 | if (nilfs->ns_writer) { |
2807 | nilfs_segctor_destroy(nilfs->ns_writer); | |
2808 | nilfs->ns_writer = NULL; | |
9ff05123 RK |
2809 | } |
2810 | ||
2811 | /* Force to free the list of dirty files */ | |
693dd321 RK |
2812 | spin_lock(&nilfs->ns_inode_lock); |
2813 | if (!list_empty(&nilfs->ns_dirty_files)) { | |
2814 | list_splice_init(&nilfs->ns_dirty_files, &garbage_list); | |
d6517deb RK |
2815 | nilfs_msg(sb, KERN_WARNING, |
2816 | "disposed unprocessed dirty file(s) when detaching log writer"); | |
9ff05123 | 2817 | } |
693dd321 | 2818 | spin_unlock(&nilfs->ns_inode_lock); |
9ff05123 RK |
2819 | up_write(&nilfs->ns_segctor_sem); |
2820 | ||
693dd321 | 2821 | nilfs_dispose_list(nilfs, &garbage_list, 1); |
9ff05123 | 2822 | } |