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1/*
2 * segment.c - NILFS segment constructor.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * Written by Ryusuke Konishi.
17 *
18 */
19
20#include <linux/pagemap.h>
21#include <linux/buffer_head.h>
22#include <linux/writeback.h>
23#include <linux/bitops.h>
24#include <linux/bio.h>
25#include <linux/completion.h>
26#include <linux/blkdev.h>
27#include <linux/backing-dev.h>
28#include <linux/freezer.h>
29#include <linux/kthread.h>
30#include <linux/crc32.h>
31#include <linux/pagevec.h>
32#include <linux/slab.h>
33#include <linux/sched/signal.h>
34
35#include "nilfs.h"
36#include "btnode.h"
37#include "page.h"
38#include "segment.h"
39#include "sufile.h"
40#include "cpfile.h"
41#include "ifile.h"
42#include "segbuf.h"
43
44
45/*
46 * Segment constructor
47 */
48#define SC_N_INODEVEC 16 /* Size of locally allocated inode vector */
49
50#define SC_MAX_SEGDELTA 64 /*
51 * Upper limit of the number of segments
52 * appended in collection retry loop
53 */
54
55/* Construction mode */
56enum {
57 SC_LSEG_SR = 1, /* Make a logical segment having a super root */
58 SC_LSEG_DSYNC, /*
59 * Flush data blocks of a given file and make
60 * a logical segment without a super root.
61 */
62 SC_FLUSH_FILE, /*
63 * Flush data files, leads to segment writes without
64 * creating a checkpoint.
65 */
66 SC_FLUSH_DAT, /*
67 * Flush DAT file. This also creates segments
68 * without a checkpoint.
69 */
70};
71
72/* Stage numbers of dirty block collection */
73enum {
74 NILFS_ST_INIT = 0,
75 NILFS_ST_GC, /* Collecting dirty blocks for GC */
76 NILFS_ST_FILE,
77 NILFS_ST_IFILE,
78 NILFS_ST_CPFILE,
79 NILFS_ST_SUFILE,
80 NILFS_ST_DAT,
81 NILFS_ST_SR, /* Super root */
82 NILFS_ST_DSYNC, /* Data sync blocks */
83 NILFS_ST_DONE,
84};
85
86#define CREATE_TRACE_POINTS
87#include <trace/events/nilfs2.h>
88
89/*
90 * nilfs_sc_cstage_inc(), nilfs_sc_cstage_set(), nilfs_sc_cstage_get() are
91 * wrapper functions of stage count (nilfs_sc_info->sc_stage.scnt). Users of
92 * the variable must use them because transition of stage count must involve
93 * trace events (trace_nilfs2_collection_stage_transition).
94 *
95 * nilfs_sc_cstage_get() isn't required for the above purpose because it doesn't
96 * produce tracepoint events. It is provided just for making the intention
97 * clear.
98 */
99static inline void nilfs_sc_cstage_inc(struct nilfs_sc_info *sci)
100{
101 sci->sc_stage.scnt++;
102 trace_nilfs2_collection_stage_transition(sci);
103}
104
105static inline void nilfs_sc_cstage_set(struct nilfs_sc_info *sci, int next_scnt)
106{
107 sci->sc_stage.scnt = next_scnt;
108 trace_nilfs2_collection_stage_transition(sci);
109}
110
111static inline int nilfs_sc_cstage_get(struct nilfs_sc_info *sci)
112{
113 return sci->sc_stage.scnt;
114}
115
116/* State flags of collection */
117#define NILFS_CF_NODE 0x0001 /* Collecting node blocks */
118#define NILFS_CF_IFILE_STARTED 0x0002 /* IFILE stage has started */
119#define NILFS_CF_SUFREED 0x0004 /* segment usages has been freed */
120#define NILFS_CF_HISTORY_MASK (NILFS_CF_IFILE_STARTED | NILFS_CF_SUFREED)
121
122/* Operations depending on the construction mode and file type */
123struct nilfs_sc_operations {
124 int (*collect_data)(struct nilfs_sc_info *, struct buffer_head *,
125 struct inode *);
126 int (*collect_node)(struct nilfs_sc_info *, struct buffer_head *,
127 struct inode *);
128 int (*collect_bmap)(struct nilfs_sc_info *, struct buffer_head *,
129 struct inode *);
130 void (*write_data_binfo)(struct nilfs_sc_info *,
131 struct nilfs_segsum_pointer *,
132 union nilfs_binfo *);
133 void (*write_node_binfo)(struct nilfs_sc_info *,
134 struct nilfs_segsum_pointer *,
135 union nilfs_binfo *);
136};
137
138/*
139 * Other definitions
140 */
141static void nilfs_segctor_start_timer(struct nilfs_sc_info *);
142static void nilfs_segctor_do_flush(struct nilfs_sc_info *, int);
143static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *);
144static void nilfs_dispose_list(struct the_nilfs *, struct list_head *, int);
145
146#define nilfs_cnt32_gt(a, b) \
147 (typecheck(__u32, a) && typecheck(__u32, b) && \
148 ((__s32)(b) - (__s32)(a) < 0))
149#define nilfs_cnt32_ge(a, b) \
150 (typecheck(__u32, a) && typecheck(__u32, b) && \
151 ((__s32)(a) - (__s32)(b) >= 0))
152#define nilfs_cnt32_lt(a, b) nilfs_cnt32_gt(b, a)
153#define nilfs_cnt32_le(a, b) nilfs_cnt32_ge(b, a)
154
155static int nilfs_prepare_segment_lock(struct super_block *sb,
156 struct nilfs_transaction_info *ti)
157{
158 struct nilfs_transaction_info *cur_ti = current->journal_info;
159 void *save = NULL;
160
161 if (cur_ti) {
162 if (cur_ti->ti_magic == NILFS_TI_MAGIC)
163 return ++cur_ti->ti_count;
164
165 /*
166 * If journal_info field is occupied by other FS,
167 * it is saved and will be restored on
168 * nilfs_transaction_commit().
169 */
170 nilfs_msg(sb, KERN_WARNING, "journal info from a different FS");
171 save = current->journal_info;
172 }
173 if (!ti) {
174 ti = kmem_cache_alloc(nilfs_transaction_cachep, GFP_NOFS);
175 if (!ti)
176 return -ENOMEM;
177 ti->ti_flags = NILFS_TI_DYNAMIC_ALLOC;
178 } else {
179 ti->ti_flags = 0;
180 }
181 ti->ti_count = 0;
182 ti->ti_save = save;
183 ti->ti_magic = NILFS_TI_MAGIC;
184 current->journal_info = ti;
185 return 0;
186}
187
188/**
189 * nilfs_transaction_begin - start indivisible file operations.
190 * @sb: super block
191 * @ti: nilfs_transaction_info
192 * @vacancy_check: flags for vacancy rate checks
193 *
194 * nilfs_transaction_begin() acquires a reader/writer semaphore, called
195 * the segment semaphore, to make a segment construction and write tasks
196 * exclusive. The function is used with nilfs_transaction_commit() in pairs.
197 * The region enclosed by these two functions can be nested. To avoid a
198 * deadlock, the semaphore is only acquired or released in the outermost call.
199 *
200 * This function allocates a nilfs_transaction_info struct to keep context
201 * information on it. It is initialized and hooked onto the current task in
202 * the outermost call. If a pre-allocated struct is given to @ti, it is used
203 * instead; otherwise a new struct is assigned from a slab.
204 *
205 * When @vacancy_check flag is set, this function will check the amount of
206 * free space, and will wait for the GC to reclaim disk space if low capacity.
207 *
208 * Return Value: On success, 0 is returned. On error, one of the following
209 * negative error code is returned.
210 *
211 * %-ENOMEM - Insufficient memory available.
212 *
213 * %-ENOSPC - No space left on device
214 */
215int nilfs_transaction_begin(struct super_block *sb,
216 struct nilfs_transaction_info *ti,
217 int vacancy_check)
218{
219 struct the_nilfs *nilfs;
220 int ret = nilfs_prepare_segment_lock(sb, ti);
221 struct nilfs_transaction_info *trace_ti;
222
223 if (unlikely(ret < 0))
224 return ret;
225 if (ret > 0) {
226 trace_ti = current->journal_info;
227
228 trace_nilfs2_transaction_transition(sb, trace_ti,
229 trace_ti->ti_count, trace_ti->ti_flags,
230 TRACE_NILFS2_TRANSACTION_BEGIN);
231 return 0;
232 }
233
234 sb_start_intwrite(sb);
235
236 nilfs = sb->s_fs_info;
237 down_read(&nilfs->ns_segctor_sem);
238 if (vacancy_check && nilfs_near_disk_full(nilfs)) {
239 up_read(&nilfs->ns_segctor_sem);
240 ret = -ENOSPC;
241 goto failed;
242 }
243
244 trace_ti = current->journal_info;
245 trace_nilfs2_transaction_transition(sb, trace_ti, trace_ti->ti_count,
246 trace_ti->ti_flags,
247 TRACE_NILFS2_TRANSACTION_BEGIN);
248 return 0;
249
250 failed:
251 ti = current->journal_info;
252 current->journal_info = ti->ti_save;
253 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
254 kmem_cache_free(nilfs_transaction_cachep, ti);
255 sb_end_intwrite(sb);
256 return ret;
257}
258
259/**
260 * nilfs_transaction_commit - commit indivisible file operations.
261 * @sb: super block
262 *
263 * nilfs_transaction_commit() releases the read semaphore which is
264 * acquired by nilfs_transaction_begin(). This is only performed
265 * in outermost call of this function. If a commit flag is set,
266 * nilfs_transaction_commit() sets a timer to start the segment
267 * constructor. If a sync flag is set, it starts construction
268 * directly.
269 */
270int nilfs_transaction_commit(struct super_block *sb)
271{
272 struct nilfs_transaction_info *ti = current->journal_info;
273 struct the_nilfs *nilfs = sb->s_fs_info;
274 int err = 0;
275
276 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
277 ti->ti_flags |= NILFS_TI_COMMIT;
278 if (ti->ti_count > 0) {
279 ti->ti_count--;
280 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
281 ti->ti_flags, TRACE_NILFS2_TRANSACTION_COMMIT);
282 return 0;
283 }
284 if (nilfs->ns_writer) {
285 struct nilfs_sc_info *sci = nilfs->ns_writer;
286
287 if (ti->ti_flags & NILFS_TI_COMMIT)
288 nilfs_segctor_start_timer(sci);
289 if (atomic_read(&nilfs->ns_ndirtyblks) > sci->sc_watermark)
290 nilfs_segctor_do_flush(sci, 0);
291 }
292 up_read(&nilfs->ns_segctor_sem);
293 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
294 ti->ti_flags, TRACE_NILFS2_TRANSACTION_COMMIT);
295
296 current->journal_info = ti->ti_save;
297
298 if (ti->ti_flags & NILFS_TI_SYNC)
299 err = nilfs_construct_segment(sb);
300 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
301 kmem_cache_free(nilfs_transaction_cachep, ti);
302 sb_end_intwrite(sb);
303 return err;
304}
305
306void nilfs_transaction_abort(struct super_block *sb)
307{
308 struct nilfs_transaction_info *ti = current->journal_info;
309 struct the_nilfs *nilfs = sb->s_fs_info;
310
311 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
312 if (ti->ti_count > 0) {
313 ti->ti_count--;
314 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
315 ti->ti_flags, TRACE_NILFS2_TRANSACTION_ABORT);
316 return;
317 }
318 up_read(&nilfs->ns_segctor_sem);
319
320 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
321 ti->ti_flags, TRACE_NILFS2_TRANSACTION_ABORT);
322
323 current->journal_info = ti->ti_save;
324 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
325 kmem_cache_free(nilfs_transaction_cachep, ti);
326 sb_end_intwrite(sb);
327}
328
329void nilfs_relax_pressure_in_lock(struct super_block *sb)
330{
331 struct the_nilfs *nilfs = sb->s_fs_info;
332 struct nilfs_sc_info *sci = nilfs->ns_writer;
333
334 if (!sci || !sci->sc_flush_request)
335 return;
336
337 set_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags);
338 up_read(&nilfs->ns_segctor_sem);
339
340 down_write(&nilfs->ns_segctor_sem);
341 if (sci->sc_flush_request &&
342 test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags)) {
343 struct nilfs_transaction_info *ti = current->journal_info;
344
345 ti->ti_flags |= NILFS_TI_WRITER;
346 nilfs_segctor_do_immediate_flush(sci);
347 ti->ti_flags &= ~NILFS_TI_WRITER;
348 }
349 downgrade_write(&nilfs->ns_segctor_sem);
350}
351
352static void nilfs_transaction_lock(struct super_block *sb,
353 struct nilfs_transaction_info *ti,
354 int gcflag)
355{
356 struct nilfs_transaction_info *cur_ti = current->journal_info;
357 struct the_nilfs *nilfs = sb->s_fs_info;
358 struct nilfs_sc_info *sci = nilfs->ns_writer;
359
360 WARN_ON(cur_ti);
361 ti->ti_flags = NILFS_TI_WRITER;
362 ti->ti_count = 0;
363 ti->ti_save = cur_ti;
364 ti->ti_magic = NILFS_TI_MAGIC;
365 current->journal_info = ti;
366
367 for (;;) {
368 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
369 ti->ti_flags, TRACE_NILFS2_TRANSACTION_TRYLOCK);
370
371 down_write(&nilfs->ns_segctor_sem);
372 if (!test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags))
373 break;
374
375 nilfs_segctor_do_immediate_flush(sci);
376
377 up_write(&nilfs->ns_segctor_sem);
378 cond_resched();
379 }
380 if (gcflag)
381 ti->ti_flags |= NILFS_TI_GC;
382
383 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
384 ti->ti_flags, TRACE_NILFS2_TRANSACTION_LOCK);
385}
386
387static void nilfs_transaction_unlock(struct super_block *sb)
388{
389 struct nilfs_transaction_info *ti = current->journal_info;
390 struct the_nilfs *nilfs = sb->s_fs_info;
391
392 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
393 BUG_ON(ti->ti_count > 0);
394
395 up_write(&nilfs->ns_segctor_sem);
396 current->journal_info = ti->ti_save;
397
398 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
399 ti->ti_flags, TRACE_NILFS2_TRANSACTION_UNLOCK);
400}
401
402static void *nilfs_segctor_map_segsum_entry(struct nilfs_sc_info *sci,
403 struct nilfs_segsum_pointer *ssp,
404 unsigned int bytes)
405{
406 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
407 unsigned int blocksize = sci->sc_super->s_blocksize;
408 void *p;
409
410 if (unlikely(ssp->offset + bytes > blocksize)) {
411 ssp->offset = 0;
412 BUG_ON(NILFS_SEGBUF_BH_IS_LAST(ssp->bh,
413 &segbuf->sb_segsum_buffers));
414 ssp->bh = NILFS_SEGBUF_NEXT_BH(ssp->bh);
415 }
416 p = ssp->bh->b_data + ssp->offset;
417 ssp->offset += bytes;
418 return p;
419}
420
421/**
422 * nilfs_segctor_reset_segment_buffer - reset the current segment buffer
423 * @sci: nilfs_sc_info
424 */
425static int nilfs_segctor_reset_segment_buffer(struct nilfs_sc_info *sci)
426{
427 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
428 struct buffer_head *sumbh;
429 unsigned int sumbytes;
430 unsigned int flags = 0;
431 int err;
432
433 if (nilfs_doing_gc())
434 flags = NILFS_SS_GC;
435 err = nilfs_segbuf_reset(segbuf, flags, sci->sc_seg_ctime, sci->sc_cno);
436 if (unlikely(err))
437 return err;
438
439 sumbh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers);
440 sumbytes = segbuf->sb_sum.sumbytes;
441 sci->sc_finfo_ptr.bh = sumbh; sci->sc_finfo_ptr.offset = sumbytes;
442 sci->sc_binfo_ptr.bh = sumbh; sci->sc_binfo_ptr.offset = sumbytes;
443 sci->sc_blk_cnt = sci->sc_datablk_cnt = 0;
444 return 0;
445}
446
447static int nilfs_segctor_feed_segment(struct nilfs_sc_info *sci)
448{
449 sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
450 if (NILFS_SEGBUF_IS_LAST(sci->sc_curseg, &sci->sc_segbufs))
451 return -E2BIG; /*
452 * The current segment is filled up
453 * (internal code)
454 */
455 sci->sc_curseg = NILFS_NEXT_SEGBUF(sci->sc_curseg);
456 return nilfs_segctor_reset_segment_buffer(sci);
457}
458
459static int nilfs_segctor_add_super_root(struct nilfs_sc_info *sci)
460{
461 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
462 int err;
463
464 if (segbuf->sb_sum.nblocks >= segbuf->sb_rest_blocks) {
465 err = nilfs_segctor_feed_segment(sci);
466 if (err)
467 return err;
468 segbuf = sci->sc_curseg;
469 }
470 err = nilfs_segbuf_extend_payload(segbuf, &segbuf->sb_super_root);
471 if (likely(!err))
472 segbuf->sb_sum.flags |= NILFS_SS_SR;
473 return err;
474}
475
476/*
477 * Functions for making segment summary and payloads
478 */
479static int nilfs_segctor_segsum_block_required(
480 struct nilfs_sc_info *sci, const struct nilfs_segsum_pointer *ssp,
481 unsigned int binfo_size)
482{
483 unsigned int blocksize = sci->sc_super->s_blocksize;
484 /* Size of finfo and binfo is enough small against blocksize */
485
486 return ssp->offset + binfo_size +
487 (!sci->sc_blk_cnt ? sizeof(struct nilfs_finfo) : 0) >
488 blocksize;
489}
490
491static void nilfs_segctor_begin_finfo(struct nilfs_sc_info *sci,
492 struct inode *inode)
493{
494 sci->sc_curseg->sb_sum.nfinfo++;
495 sci->sc_binfo_ptr = sci->sc_finfo_ptr;
496 nilfs_segctor_map_segsum_entry(
497 sci, &sci->sc_binfo_ptr, sizeof(struct nilfs_finfo));
498
499 if (NILFS_I(inode)->i_root &&
500 !test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags))
501 set_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
502 /* skip finfo */
503}
504
505static void nilfs_segctor_end_finfo(struct nilfs_sc_info *sci,
506 struct inode *inode)
507{
508 struct nilfs_finfo *finfo;
509 struct nilfs_inode_info *ii;
510 struct nilfs_segment_buffer *segbuf;
511 __u64 cno;
512
513 if (sci->sc_blk_cnt == 0)
514 return;
515
516 ii = NILFS_I(inode);
517
518 if (test_bit(NILFS_I_GCINODE, &ii->i_state))
519 cno = ii->i_cno;
520 else if (NILFS_ROOT_METADATA_FILE(inode->i_ino))
521 cno = 0;
522 else
523 cno = sci->sc_cno;
524
525 finfo = nilfs_segctor_map_segsum_entry(sci, &sci->sc_finfo_ptr,
526 sizeof(*finfo));
527 finfo->fi_ino = cpu_to_le64(inode->i_ino);
528 finfo->fi_nblocks = cpu_to_le32(sci->sc_blk_cnt);
529 finfo->fi_ndatablk = cpu_to_le32(sci->sc_datablk_cnt);
530 finfo->fi_cno = cpu_to_le64(cno);
531
532 segbuf = sci->sc_curseg;
533 segbuf->sb_sum.sumbytes = sci->sc_binfo_ptr.offset +
534 sci->sc_super->s_blocksize * (segbuf->sb_sum.nsumblk - 1);
535 sci->sc_finfo_ptr = sci->sc_binfo_ptr;
536 sci->sc_blk_cnt = sci->sc_datablk_cnt = 0;
537}
538
539static int nilfs_segctor_add_file_block(struct nilfs_sc_info *sci,
540 struct buffer_head *bh,
541 struct inode *inode,
542 unsigned int binfo_size)
543{
544 struct nilfs_segment_buffer *segbuf;
545 int required, err = 0;
546
547 retry:
548 segbuf = sci->sc_curseg;
549 required = nilfs_segctor_segsum_block_required(
550 sci, &sci->sc_binfo_ptr, binfo_size);
551 if (segbuf->sb_sum.nblocks + required + 1 > segbuf->sb_rest_blocks) {
552 nilfs_segctor_end_finfo(sci, inode);
553 err = nilfs_segctor_feed_segment(sci);
554 if (err)
555 return err;
556 goto retry;
557 }
558 if (unlikely(required)) {
559 err = nilfs_segbuf_extend_segsum(segbuf);
560 if (unlikely(err))
561 goto failed;
562 }
563 if (sci->sc_blk_cnt == 0)
564 nilfs_segctor_begin_finfo(sci, inode);
565
566 nilfs_segctor_map_segsum_entry(sci, &sci->sc_binfo_ptr, binfo_size);
567 /* Substitution to vblocknr is delayed until update_blocknr() */
568 nilfs_segbuf_add_file_buffer(segbuf, bh);
569 sci->sc_blk_cnt++;
570 failed:
571 return err;
572}
573
574/*
575 * Callback functions that enumerate, mark, and collect dirty blocks
576 */
577static int nilfs_collect_file_data(struct nilfs_sc_info *sci,
578 struct buffer_head *bh, struct inode *inode)
579{
580 int err;
581
582 err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
583 if (err < 0)
584 return err;
585
586 err = nilfs_segctor_add_file_block(sci, bh, inode,
587 sizeof(struct nilfs_binfo_v));
588 if (!err)
589 sci->sc_datablk_cnt++;
590 return err;
591}
592
593static int nilfs_collect_file_node(struct nilfs_sc_info *sci,
594 struct buffer_head *bh,
595 struct inode *inode)
596{
597 return nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
598}
599
600static int nilfs_collect_file_bmap(struct nilfs_sc_info *sci,
601 struct buffer_head *bh,
602 struct inode *inode)
603{
604 WARN_ON(!buffer_dirty(bh));
605 return nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
606}
607
608static void nilfs_write_file_data_binfo(struct nilfs_sc_info *sci,
609 struct nilfs_segsum_pointer *ssp,
610 union nilfs_binfo *binfo)
611{
612 struct nilfs_binfo_v *binfo_v = nilfs_segctor_map_segsum_entry(
613 sci, ssp, sizeof(*binfo_v));
614 *binfo_v = binfo->bi_v;
615}
616
617static void nilfs_write_file_node_binfo(struct nilfs_sc_info *sci,
618 struct nilfs_segsum_pointer *ssp,
619 union nilfs_binfo *binfo)
620{
621 __le64 *vblocknr = nilfs_segctor_map_segsum_entry(
622 sci, ssp, sizeof(*vblocknr));
623 *vblocknr = binfo->bi_v.bi_vblocknr;
624}
625
626static const struct nilfs_sc_operations nilfs_sc_file_ops = {
627 .collect_data = nilfs_collect_file_data,
628 .collect_node = nilfs_collect_file_node,
629 .collect_bmap = nilfs_collect_file_bmap,
630 .write_data_binfo = nilfs_write_file_data_binfo,
631 .write_node_binfo = nilfs_write_file_node_binfo,
632};
633
634static int nilfs_collect_dat_data(struct nilfs_sc_info *sci,
635 struct buffer_head *bh, struct inode *inode)
636{
637 int err;
638
639 err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
640 if (err < 0)
641 return err;
642
643 err = nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
644 if (!err)
645 sci->sc_datablk_cnt++;
646 return err;
647}
648
649static int nilfs_collect_dat_bmap(struct nilfs_sc_info *sci,
650 struct buffer_head *bh, struct inode *inode)
651{
652 WARN_ON(!buffer_dirty(bh));
653 return nilfs_segctor_add_file_block(sci, bh, inode,
654 sizeof(struct nilfs_binfo_dat));
655}
656
657static void nilfs_write_dat_data_binfo(struct nilfs_sc_info *sci,
658 struct nilfs_segsum_pointer *ssp,
659 union nilfs_binfo *binfo)
660{
661 __le64 *blkoff = nilfs_segctor_map_segsum_entry(sci, ssp,
662 sizeof(*blkoff));
663 *blkoff = binfo->bi_dat.bi_blkoff;
664}
665
666static void nilfs_write_dat_node_binfo(struct nilfs_sc_info *sci,
667 struct nilfs_segsum_pointer *ssp,
668 union nilfs_binfo *binfo)
669{
670 struct nilfs_binfo_dat *binfo_dat =
671 nilfs_segctor_map_segsum_entry(sci, ssp, sizeof(*binfo_dat));
672 *binfo_dat = binfo->bi_dat;
673}
674
675static const struct nilfs_sc_operations nilfs_sc_dat_ops = {
676 .collect_data = nilfs_collect_dat_data,
677 .collect_node = nilfs_collect_file_node,
678 .collect_bmap = nilfs_collect_dat_bmap,
679 .write_data_binfo = nilfs_write_dat_data_binfo,
680 .write_node_binfo = nilfs_write_dat_node_binfo,
681};
682
683static const struct nilfs_sc_operations nilfs_sc_dsync_ops = {
684 .collect_data = nilfs_collect_file_data,
685 .collect_node = NULL,
686 .collect_bmap = NULL,
687 .write_data_binfo = nilfs_write_file_data_binfo,
688 .write_node_binfo = NULL,
689};
690
691static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode,
692 struct list_head *listp,
693 size_t nlimit,
694 loff_t start, loff_t end)
695{
696 struct address_space *mapping = inode->i_mapping;
697 struct pagevec pvec;
698 pgoff_t index = 0, last = ULONG_MAX;
699 size_t ndirties = 0;
700 int i;
701
702 if (unlikely(start != 0 || end != LLONG_MAX)) {
703 /*
704 * A valid range is given for sync-ing data pages. The
705 * range is rounded to per-page; extra dirty buffers
706 * may be included if blocksize < pagesize.
707 */
708 index = start >> PAGE_SHIFT;
709 last = end >> PAGE_SHIFT;
710 }
711 pagevec_init(&pvec);
712 repeat:
713 if (unlikely(index > last) ||
714 !pagevec_lookup_range_tag(&pvec, mapping, &index, last,
715 PAGECACHE_TAG_DIRTY))
716 return ndirties;
717
718 for (i = 0; i < pagevec_count(&pvec); i++) {
719 struct buffer_head *bh, *head;
720 struct page *page = pvec.pages[i];
721
722 lock_page(page);
723 if (!page_has_buffers(page))
724 create_empty_buffers(page, i_blocksize(inode), 0);
725 unlock_page(page);
726
727 bh = head = page_buffers(page);
728 do {
729 if (!buffer_dirty(bh) || buffer_async_write(bh))
730 continue;
731 get_bh(bh);
732 list_add_tail(&bh->b_assoc_buffers, listp);
733 ndirties++;
734 if (unlikely(ndirties >= nlimit)) {
735 pagevec_release(&pvec);
736 cond_resched();
737 return ndirties;
738 }
739 } while (bh = bh->b_this_page, bh != head);
740 }
741 pagevec_release(&pvec);
742 cond_resched();
743 goto repeat;
744}
745
746static void nilfs_lookup_dirty_node_buffers(struct inode *inode,
747 struct list_head *listp)
748{
749 struct nilfs_inode_info *ii = NILFS_I(inode);
750 struct address_space *mapping = &ii->i_btnode_cache;
751 struct pagevec pvec;
752 struct buffer_head *bh, *head;
753 unsigned int i;
754 pgoff_t index = 0;
755
756 pagevec_init(&pvec);
757
758 while (pagevec_lookup_tag(&pvec, mapping, &index,
759 PAGECACHE_TAG_DIRTY)) {
760 for (i = 0; i < pagevec_count(&pvec); i++) {
761 bh = head = page_buffers(pvec.pages[i]);
762 do {
763 if (buffer_dirty(bh) &&
764 !buffer_async_write(bh)) {
765 get_bh(bh);
766 list_add_tail(&bh->b_assoc_buffers,
767 listp);
768 }
769 bh = bh->b_this_page;
770 } while (bh != head);
771 }
772 pagevec_release(&pvec);
773 cond_resched();
774 }
775}
776
777static void nilfs_dispose_list(struct the_nilfs *nilfs,
778 struct list_head *head, int force)
779{
780 struct nilfs_inode_info *ii, *n;
781 struct nilfs_inode_info *ivec[SC_N_INODEVEC], **pii;
782 unsigned int nv = 0;
783
784 while (!list_empty(head)) {
785 spin_lock(&nilfs->ns_inode_lock);
786 list_for_each_entry_safe(ii, n, head, i_dirty) {
787 list_del_init(&ii->i_dirty);
788 if (force) {
789 if (unlikely(ii->i_bh)) {
790 brelse(ii->i_bh);
791 ii->i_bh = NULL;
792 }
793 } else if (test_bit(NILFS_I_DIRTY, &ii->i_state)) {
794 set_bit(NILFS_I_QUEUED, &ii->i_state);
795 list_add_tail(&ii->i_dirty,
796 &nilfs->ns_dirty_files);
797 continue;
798 }
799 ivec[nv++] = ii;
800 if (nv == SC_N_INODEVEC)
801 break;
802 }
803 spin_unlock(&nilfs->ns_inode_lock);
804
805 for (pii = ivec; nv > 0; pii++, nv--)
806 iput(&(*pii)->vfs_inode);
807 }
808}
809
810static void nilfs_iput_work_func(struct work_struct *work)
811{
812 struct nilfs_sc_info *sci = container_of(work, struct nilfs_sc_info,
813 sc_iput_work);
814 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
815
816 nilfs_dispose_list(nilfs, &sci->sc_iput_queue, 0);
817}
818
819static int nilfs_test_metadata_dirty(struct the_nilfs *nilfs,
820 struct nilfs_root *root)
821{
822 int ret = 0;
823
824 if (nilfs_mdt_fetch_dirty(root->ifile))
825 ret++;
826 if (nilfs_mdt_fetch_dirty(nilfs->ns_cpfile))
827 ret++;
828 if (nilfs_mdt_fetch_dirty(nilfs->ns_sufile))
829 ret++;
830 if ((ret || nilfs_doing_gc()) && nilfs_mdt_fetch_dirty(nilfs->ns_dat))
831 ret++;
832 return ret;
833}
834
835static int nilfs_segctor_clean(struct nilfs_sc_info *sci)
836{
837 return list_empty(&sci->sc_dirty_files) &&
838 !test_bit(NILFS_SC_DIRTY, &sci->sc_flags) &&
839 sci->sc_nfreesegs == 0 &&
840 (!nilfs_doing_gc() || list_empty(&sci->sc_gc_inodes));
841}
842
843static int nilfs_segctor_confirm(struct nilfs_sc_info *sci)
844{
845 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
846 int ret = 0;
847
848 if (nilfs_test_metadata_dirty(nilfs, sci->sc_root))
849 set_bit(NILFS_SC_DIRTY, &sci->sc_flags);
850
851 spin_lock(&nilfs->ns_inode_lock);
852 if (list_empty(&nilfs->ns_dirty_files) && nilfs_segctor_clean(sci))
853 ret++;
854
855 spin_unlock(&nilfs->ns_inode_lock);
856 return ret;
857}
858
859static void nilfs_segctor_clear_metadata_dirty(struct nilfs_sc_info *sci)
860{
861 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
862
863 nilfs_mdt_clear_dirty(sci->sc_root->ifile);
864 nilfs_mdt_clear_dirty(nilfs->ns_cpfile);
865 nilfs_mdt_clear_dirty(nilfs->ns_sufile);
866 nilfs_mdt_clear_dirty(nilfs->ns_dat);
867}
868
869static int nilfs_segctor_create_checkpoint(struct nilfs_sc_info *sci)
870{
871 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
872 struct buffer_head *bh_cp;
873 struct nilfs_checkpoint *raw_cp;
874 int err;
875
876 /* XXX: this interface will be changed */
877 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 1,
878 &raw_cp, &bh_cp);
879 if (likely(!err)) {
880 /*
881 * The following code is duplicated with cpfile. But, it is
882 * needed to collect the checkpoint even if it was not newly
883 * created.
884 */
885 mark_buffer_dirty(bh_cp);
886 nilfs_mdt_mark_dirty(nilfs->ns_cpfile);
887 nilfs_cpfile_put_checkpoint(
888 nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
889 } else
890 WARN_ON(err == -EINVAL || err == -ENOENT);
891
892 return err;
893}
894
895static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci)
896{
897 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
898 struct buffer_head *bh_cp;
899 struct nilfs_checkpoint *raw_cp;
900 int err;
901
902 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 0,
903 &raw_cp, &bh_cp);
904 if (unlikely(err)) {
905 WARN_ON(err == -EINVAL || err == -ENOENT);
906 goto failed_ibh;
907 }
908 raw_cp->cp_snapshot_list.ssl_next = 0;
909 raw_cp->cp_snapshot_list.ssl_prev = 0;
910 raw_cp->cp_inodes_count =
911 cpu_to_le64(atomic64_read(&sci->sc_root->inodes_count));
912 raw_cp->cp_blocks_count =
913 cpu_to_le64(atomic64_read(&sci->sc_root->blocks_count));
914 raw_cp->cp_nblk_inc =
915 cpu_to_le64(sci->sc_nblk_inc + sci->sc_nblk_this_inc);
916 raw_cp->cp_create = cpu_to_le64(sci->sc_seg_ctime);
917 raw_cp->cp_cno = cpu_to_le64(nilfs->ns_cno);
918
919 if (test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags))
920 nilfs_checkpoint_clear_minor(raw_cp);
921 else
922 nilfs_checkpoint_set_minor(raw_cp);
923
924 nilfs_write_inode_common(sci->sc_root->ifile,
925 &raw_cp->cp_ifile_inode, 1);
926 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
927 return 0;
928
929 failed_ibh:
930 return err;
931}
932
933static void nilfs_fill_in_file_bmap(struct inode *ifile,
934 struct nilfs_inode_info *ii)
935
936{
937 struct buffer_head *ibh;
938 struct nilfs_inode *raw_inode;
939
940 if (test_bit(NILFS_I_BMAP, &ii->i_state)) {
941 ibh = ii->i_bh;
942 BUG_ON(!ibh);
943 raw_inode = nilfs_ifile_map_inode(ifile, ii->vfs_inode.i_ino,
944 ibh);
945 nilfs_bmap_write(ii->i_bmap, raw_inode);
946 nilfs_ifile_unmap_inode(ifile, ii->vfs_inode.i_ino, ibh);
947 }
948}
949
950static void nilfs_segctor_fill_in_file_bmap(struct nilfs_sc_info *sci)
951{
952 struct nilfs_inode_info *ii;
953
954 list_for_each_entry(ii, &sci->sc_dirty_files, i_dirty) {
955 nilfs_fill_in_file_bmap(sci->sc_root->ifile, ii);
956 set_bit(NILFS_I_COLLECTED, &ii->i_state);
957 }
958}
959
960static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info *sci,
961 struct the_nilfs *nilfs)
962{
963 struct buffer_head *bh_sr;
964 struct nilfs_super_root *raw_sr;
965 unsigned int isz, srsz;
966
967 bh_sr = NILFS_LAST_SEGBUF(&sci->sc_segbufs)->sb_super_root;
968 raw_sr = (struct nilfs_super_root *)bh_sr->b_data;
969 isz = nilfs->ns_inode_size;
970 srsz = NILFS_SR_BYTES(isz);
971
972 raw_sr->sr_bytes = cpu_to_le16(srsz);
973 raw_sr->sr_nongc_ctime
974 = cpu_to_le64(nilfs_doing_gc() ?
975 nilfs->ns_nongc_ctime : sci->sc_seg_ctime);
976 raw_sr->sr_flags = 0;
977
978 nilfs_write_inode_common(nilfs->ns_dat, (void *)raw_sr +
979 NILFS_SR_DAT_OFFSET(isz), 1);
980 nilfs_write_inode_common(nilfs->ns_cpfile, (void *)raw_sr +
981 NILFS_SR_CPFILE_OFFSET(isz), 1);
982 nilfs_write_inode_common(nilfs->ns_sufile, (void *)raw_sr +
983 NILFS_SR_SUFILE_OFFSET(isz), 1);
984 memset((void *)raw_sr + srsz, 0, nilfs->ns_blocksize - srsz);
985}
986
987static void nilfs_redirty_inodes(struct list_head *head)
988{
989 struct nilfs_inode_info *ii;
990
991 list_for_each_entry(ii, head, i_dirty) {
992 if (test_bit(NILFS_I_COLLECTED, &ii->i_state))
993 clear_bit(NILFS_I_COLLECTED, &ii->i_state);
994 }
995}
996
997static void nilfs_drop_collected_inodes(struct list_head *head)
998{
999 struct nilfs_inode_info *ii;
1000
1001 list_for_each_entry(ii, head, i_dirty) {
1002 if (!test_and_clear_bit(NILFS_I_COLLECTED, &ii->i_state))
1003 continue;
1004
1005 clear_bit(NILFS_I_INODE_SYNC, &ii->i_state);
1006 set_bit(NILFS_I_UPDATED, &ii->i_state);
1007 }
1008}
1009
1010static int nilfs_segctor_apply_buffers(struct nilfs_sc_info *sci,
1011 struct inode *inode,
1012 struct list_head *listp,
1013 int (*collect)(struct nilfs_sc_info *,
1014 struct buffer_head *,
1015 struct inode *))
1016{
1017 struct buffer_head *bh, *n;
1018 int err = 0;
1019
1020 if (collect) {
1021 list_for_each_entry_safe(bh, n, listp, b_assoc_buffers) {
1022 list_del_init(&bh->b_assoc_buffers);
1023 err = collect(sci, bh, inode);
1024 brelse(bh);
1025 if (unlikely(err))
1026 goto dispose_buffers;
1027 }
1028 return 0;
1029 }
1030
1031 dispose_buffers:
1032 while (!list_empty(listp)) {
1033 bh = list_first_entry(listp, struct buffer_head,
1034 b_assoc_buffers);
1035 list_del_init(&bh->b_assoc_buffers);
1036 brelse(bh);
1037 }
1038 return err;
1039}
1040
1041static size_t nilfs_segctor_buffer_rest(struct nilfs_sc_info *sci)
1042{
1043 /* Remaining number of blocks within segment buffer */
1044 return sci->sc_segbuf_nblocks -
1045 (sci->sc_nblk_this_inc + sci->sc_curseg->sb_sum.nblocks);
1046}
1047
1048static int nilfs_segctor_scan_file(struct nilfs_sc_info *sci,
1049 struct inode *inode,
1050 const struct nilfs_sc_operations *sc_ops)
1051{
1052 LIST_HEAD(data_buffers);
1053 LIST_HEAD(node_buffers);
1054 int err;
1055
1056 if (!(sci->sc_stage.flags & NILFS_CF_NODE)) {
1057 size_t n, rest = nilfs_segctor_buffer_rest(sci);
1058
1059 n = nilfs_lookup_dirty_data_buffers(
1060 inode, &data_buffers, rest + 1, 0, LLONG_MAX);
1061 if (n > rest) {
1062 err = nilfs_segctor_apply_buffers(
1063 sci, inode, &data_buffers,
1064 sc_ops->collect_data);
1065 BUG_ON(!err); /* always receive -E2BIG or true error */
1066 goto break_or_fail;
1067 }
1068 }
1069 nilfs_lookup_dirty_node_buffers(inode, &node_buffers);
1070
1071 if (!(sci->sc_stage.flags & NILFS_CF_NODE)) {
1072 err = nilfs_segctor_apply_buffers(
1073 sci, inode, &data_buffers, sc_ops->collect_data);
1074 if (unlikely(err)) {
1075 /* dispose node list */
1076 nilfs_segctor_apply_buffers(
1077 sci, inode, &node_buffers, NULL);
1078 goto break_or_fail;
1079 }
1080 sci->sc_stage.flags |= NILFS_CF_NODE;
1081 }
1082 /* Collect node */
1083 err = nilfs_segctor_apply_buffers(
1084 sci, inode, &node_buffers, sc_ops->collect_node);
1085 if (unlikely(err))
1086 goto break_or_fail;
1087
1088 nilfs_bmap_lookup_dirty_buffers(NILFS_I(inode)->i_bmap, &node_buffers);
1089 err = nilfs_segctor_apply_buffers(
1090 sci, inode, &node_buffers, sc_ops->collect_bmap);
1091 if (unlikely(err))
1092 goto break_or_fail;
1093
1094 nilfs_segctor_end_finfo(sci, inode);
1095 sci->sc_stage.flags &= ~NILFS_CF_NODE;
1096
1097 break_or_fail:
1098 return err;
1099}
1100
1101static int nilfs_segctor_scan_file_dsync(struct nilfs_sc_info *sci,
1102 struct inode *inode)
1103{
1104 LIST_HEAD(data_buffers);
1105 size_t n, rest = nilfs_segctor_buffer_rest(sci);
1106 int err;
1107
1108 n = nilfs_lookup_dirty_data_buffers(inode, &data_buffers, rest + 1,
1109 sci->sc_dsync_start,
1110 sci->sc_dsync_end);
1111
1112 err = nilfs_segctor_apply_buffers(sci, inode, &data_buffers,
1113 nilfs_collect_file_data);
1114 if (!err) {
1115 nilfs_segctor_end_finfo(sci, inode);
1116 BUG_ON(n > rest);
1117 /* always receive -E2BIG or true error if n > rest */
1118 }
1119 return err;
1120}
1121
1122static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode)
1123{
1124 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
1125 struct list_head *head;
1126 struct nilfs_inode_info *ii;
1127 size_t ndone;
1128 int err = 0;
1129
1130 switch (nilfs_sc_cstage_get(sci)) {
1131 case NILFS_ST_INIT:
1132 /* Pre-processes */
1133 sci->sc_stage.flags = 0;
1134
1135 if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) {
1136 sci->sc_nblk_inc = 0;
1137 sci->sc_curseg->sb_sum.flags = NILFS_SS_LOGBGN;
1138 if (mode == SC_LSEG_DSYNC) {
1139 nilfs_sc_cstage_set(sci, NILFS_ST_DSYNC);
1140 goto dsync_mode;
1141 }
1142 }
1143
1144 sci->sc_stage.dirty_file_ptr = NULL;
1145 sci->sc_stage.gc_inode_ptr = NULL;
1146 if (mode == SC_FLUSH_DAT) {
1147 nilfs_sc_cstage_set(sci, NILFS_ST_DAT);
1148 goto dat_stage;
1149 }
1150 nilfs_sc_cstage_inc(sci); /* Fall through */
1151 case NILFS_ST_GC:
1152 if (nilfs_doing_gc()) {
1153 head = &sci->sc_gc_inodes;
1154 ii = list_prepare_entry(sci->sc_stage.gc_inode_ptr,
1155 head, i_dirty);
1156 list_for_each_entry_continue(ii, head, i_dirty) {
1157 err = nilfs_segctor_scan_file(
1158 sci, &ii->vfs_inode,
1159 &nilfs_sc_file_ops);
1160 if (unlikely(err)) {
1161 sci->sc_stage.gc_inode_ptr = list_entry(
1162 ii->i_dirty.prev,
1163 struct nilfs_inode_info,
1164 i_dirty);
1165 goto break_or_fail;
1166 }
1167 set_bit(NILFS_I_COLLECTED, &ii->i_state);
1168 }
1169 sci->sc_stage.gc_inode_ptr = NULL;
1170 }
1171 nilfs_sc_cstage_inc(sci); /* Fall through */
1172 case NILFS_ST_FILE:
1173 head = &sci->sc_dirty_files;
1174 ii = list_prepare_entry(sci->sc_stage.dirty_file_ptr, head,
1175 i_dirty);
1176 list_for_each_entry_continue(ii, head, i_dirty) {
1177 clear_bit(NILFS_I_DIRTY, &ii->i_state);
1178
1179 err = nilfs_segctor_scan_file(sci, &ii->vfs_inode,
1180 &nilfs_sc_file_ops);
1181 if (unlikely(err)) {
1182 sci->sc_stage.dirty_file_ptr =
1183 list_entry(ii->i_dirty.prev,
1184 struct nilfs_inode_info,
1185 i_dirty);
1186 goto break_or_fail;
1187 }
1188 /* sci->sc_stage.dirty_file_ptr = NILFS_I(inode); */
1189 /* XXX: required ? */
1190 }
1191 sci->sc_stage.dirty_file_ptr = NULL;
1192 if (mode == SC_FLUSH_FILE) {
1193 nilfs_sc_cstage_set(sci, NILFS_ST_DONE);
1194 return 0;
1195 }
1196 nilfs_sc_cstage_inc(sci);
1197 sci->sc_stage.flags |= NILFS_CF_IFILE_STARTED;
1198 /* Fall through */
1199 case NILFS_ST_IFILE:
1200 err = nilfs_segctor_scan_file(sci, sci->sc_root->ifile,
1201 &nilfs_sc_file_ops);
1202 if (unlikely(err))
1203 break;
1204 nilfs_sc_cstage_inc(sci);
1205 /* Creating a checkpoint */
1206 err = nilfs_segctor_create_checkpoint(sci);
1207 if (unlikely(err))
1208 break;
1209 /* Fall through */
1210 case NILFS_ST_CPFILE:
1211 err = nilfs_segctor_scan_file(sci, nilfs->ns_cpfile,
1212 &nilfs_sc_file_ops);
1213 if (unlikely(err))
1214 break;
1215 nilfs_sc_cstage_inc(sci); /* Fall through */
1216 case NILFS_ST_SUFILE:
1217 err = nilfs_sufile_freev(nilfs->ns_sufile, sci->sc_freesegs,
1218 sci->sc_nfreesegs, &ndone);
1219 if (unlikely(err)) {
1220 nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1221 sci->sc_freesegs, ndone,
1222 NULL);
1223 break;
1224 }
1225 sci->sc_stage.flags |= NILFS_CF_SUFREED;
1226
1227 err = nilfs_segctor_scan_file(sci, nilfs->ns_sufile,
1228 &nilfs_sc_file_ops);
1229 if (unlikely(err))
1230 break;
1231 nilfs_sc_cstage_inc(sci); /* Fall through */
1232 case NILFS_ST_DAT:
1233 dat_stage:
1234 err = nilfs_segctor_scan_file(sci, nilfs->ns_dat,
1235 &nilfs_sc_dat_ops);
1236 if (unlikely(err))
1237 break;
1238 if (mode == SC_FLUSH_DAT) {
1239 nilfs_sc_cstage_set(sci, NILFS_ST_DONE);
1240 return 0;
1241 }
1242 nilfs_sc_cstage_inc(sci); /* Fall through */
1243 case NILFS_ST_SR:
1244 if (mode == SC_LSEG_SR) {
1245 /* Appending a super root */
1246 err = nilfs_segctor_add_super_root(sci);
1247 if (unlikely(err))
1248 break;
1249 }
1250 /* End of a logical segment */
1251 sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND;
1252 nilfs_sc_cstage_set(sci, NILFS_ST_DONE);
1253 return 0;
1254 case NILFS_ST_DSYNC:
1255 dsync_mode:
1256 sci->sc_curseg->sb_sum.flags |= NILFS_SS_SYNDT;
1257 ii = sci->sc_dsync_inode;
1258 if (!test_bit(NILFS_I_BUSY, &ii->i_state))
1259 break;
1260
1261 err = nilfs_segctor_scan_file_dsync(sci, &ii->vfs_inode);
1262 if (unlikely(err))
1263 break;
1264 sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND;
1265 nilfs_sc_cstage_set(sci, NILFS_ST_DONE);
1266 return 0;
1267 case NILFS_ST_DONE:
1268 return 0;
1269 default:
1270 BUG();
1271 }
1272
1273 break_or_fail:
1274 return err;
1275}
1276
1277/**
1278 * nilfs_segctor_begin_construction - setup segment buffer to make a new log
1279 * @sci: nilfs_sc_info
1280 * @nilfs: nilfs object
1281 */
1282static int nilfs_segctor_begin_construction(struct nilfs_sc_info *sci,
1283 struct the_nilfs *nilfs)
1284{
1285 struct nilfs_segment_buffer *segbuf, *prev;
1286 __u64 nextnum;
1287 int err, alloc = 0;
1288
1289 segbuf = nilfs_segbuf_new(sci->sc_super);
1290 if (unlikely(!segbuf))
1291 return -ENOMEM;
1292
1293 if (list_empty(&sci->sc_write_logs)) {
1294 nilfs_segbuf_map(segbuf, nilfs->ns_segnum,
1295 nilfs->ns_pseg_offset, nilfs);
1296 if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
1297 nilfs_shift_to_next_segment(nilfs);
1298 nilfs_segbuf_map(segbuf, nilfs->ns_segnum, 0, nilfs);
1299 }
1300
1301 segbuf->sb_sum.seg_seq = nilfs->ns_seg_seq;
1302 nextnum = nilfs->ns_nextnum;
1303
1304 if (nilfs->ns_segnum == nilfs->ns_nextnum)
1305 /* Start from the head of a new full segment */
1306 alloc++;
1307 } else {
1308 /* Continue logs */
1309 prev = NILFS_LAST_SEGBUF(&sci->sc_write_logs);
1310 nilfs_segbuf_map_cont(segbuf, prev);
1311 segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq;
1312 nextnum = prev->sb_nextnum;
1313
1314 if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
1315 nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs);
1316 segbuf->sb_sum.seg_seq++;
1317 alloc++;
1318 }
1319 }
1320
1321 err = nilfs_sufile_mark_dirty(nilfs->ns_sufile, segbuf->sb_segnum);
1322 if (err)
1323 goto failed;
1324
1325 if (alloc) {
1326 err = nilfs_sufile_alloc(nilfs->ns_sufile, &nextnum);
1327 if (err)
1328 goto failed;
1329 }
1330 nilfs_segbuf_set_next_segnum(segbuf, nextnum, nilfs);
1331
1332 BUG_ON(!list_empty(&sci->sc_segbufs));
1333 list_add_tail(&segbuf->sb_list, &sci->sc_segbufs);
1334 sci->sc_segbuf_nblocks = segbuf->sb_rest_blocks;
1335 return 0;
1336
1337 failed:
1338 nilfs_segbuf_free(segbuf);
1339 return err;
1340}
1341
1342static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci,
1343 struct the_nilfs *nilfs, int nadd)
1344{
1345 struct nilfs_segment_buffer *segbuf, *prev;
1346 struct inode *sufile = nilfs->ns_sufile;
1347 __u64 nextnextnum;
1348 LIST_HEAD(list);
1349 int err, ret, i;
1350
1351 prev = NILFS_LAST_SEGBUF(&sci->sc_segbufs);
1352 /*
1353 * Since the segment specified with nextnum might be allocated during
1354 * the previous construction, the buffer including its segusage may
1355 * not be dirty. The following call ensures that the buffer is dirty
1356 * and will pin the buffer on memory until the sufile is written.
1357 */
1358 err = nilfs_sufile_mark_dirty(sufile, prev->sb_nextnum);
1359 if (unlikely(err))
1360 return err;
1361
1362 for (i = 0; i < nadd; i++) {
1363 /* extend segment info */
1364 err = -ENOMEM;
1365 segbuf = nilfs_segbuf_new(sci->sc_super);
1366 if (unlikely(!segbuf))
1367 goto failed;
1368
1369 /* map this buffer to region of segment on-disk */
1370 nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs);
1371 sci->sc_segbuf_nblocks += segbuf->sb_rest_blocks;
1372
1373 /* allocate the next next full segment */
1374 err = nilfs_sufile_alloc(sufile, &nextnextnum);
1375 if (unlikely(err))
1376 goto failed_segbuf;
1377
1378 segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq + 1;
1379 nilfs_segbuf_set_next_segnum(segbuf, nextnextnum, nilfs);
1380
1381 list_add_tail(&segbuf->sb_list, &list);
1382 prev = segbuf;
1383 }
1384 list_splice_tail(&list, &sci->sc_segbufs);
1385 return 0;
1386
1387 failed_segbuf:
1388 nilfs_segbuf_free(segbuf);
1389 failed:
1390 list_for_each_entry(segbuf, &list, sb_list) {
1391 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1392 WARN_ON(ret); /* never fails */
1393 }
1394 nilfs_destroy_logs(&list);
1395 return err;
1396}
1397
1398static void nilfs_free_incomplete_logs(struct list_head *logs,
1399 struct the_nilfs *nilfs)
1400{
1401 struct nilfs_segment_buffer *segbuf, *prev;
1402 struct inode *sufile = nilfs->ns_sufile;
1403 int ret;
1404
1405 segbuf = NILFS_FIRST_SEGBUF(logs);
1406 if (nilfs->ns_nextnum != segbuf->sb_nextnum) {
1407 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1408 WARN_ON(ret); /* never fails */
1409 }
1410 if (atomic_read(&segbuf->sb_err)) {
1411 /* Case 1: The first segment failed */
1412 if (segbuf->sb_pseg_start != segbuf->sb_fseg_start)
1413 /*
1414 * Case 1a: Partial segment appended into an existing
1415 * segment
1416 */
1417 nilfs_terminate_segment(nilfs, segbuf->sb_fseg_start,
1418 segbuf->sb_fseg_end);
1419 else /* Case 1b: New full segment */
1420 set_nilfs_discontinued(nilfs);
1421 }
1422
1423 prev = segbuf;
1424 list_for_each_entry_continue(segbuf, logs, sb_list) {
1425 if (prev->sb_nextnum != segbuf->sb_nextnum) {
1426 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1427 WARN_ON(ret); /* never fails */
1428 }
1429 if (atomic_read(&segbuf->sb_err) &&
1430 segbuf->sb_segnum != nilfs->ns_nextnum)
1431 /* Case 2: extended segment (!= next) failed */
1432 nilfs_sufile_set_error(sufile, segbuf->sb_segnum);
1433 prev = segbuf;
1434 }
1435}
1436
1437static void nilfs_segctor_update_segusage(struct nilfs_sc_info *sci,
1438 struct inode *sufile)
1439{
1440 struct nilfs_segment_buffer *segbuf;
1441 unsigned long live_blocks;
1442 int ret;
1443
1444 list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
1445 live_blocks = segbuf->sb_sum.nblocks +
1446 (segbuf->sb_pseg_start - segbuf->sb_fseg_start);
1447 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1448 live_blocks,
1449 sci->sc_seg_ctime);
1450 WARN_ON(ret); /* always succeed because the segusage is dirty */
1451 }
1452}
1453
1454static void nilfs_cancel_segusage(struct list_head *logs, struct inode *sufile)
1455{
1456 struct nilfs_segment_buffer *segbuf;
1457 int ret;
1458
1459 segbuf = NILFS_FIRST_SEGBUF(logs);
1460 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1461 segbuf->sb_pseg_start -
1462 segbuf->sb_fseg_start, 0);
1463 WARN_ON(ret); /* always succeed because the segusage is dirty */
1464
1465 list_for_each_entry_continue(segbuf, logs, sb_list) {
1466 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1467 0, 0);
1468 WARN_ON(ret); /* always succeed */
1469 }
1470}
1471
1472static void nilfs_segctor_truncate_segments(struct nilfs_sc_info *sci,
1473 struct nilfs_segment_buffer *last,
1474 struct inode *sufile)
1475{
1476 struct nilfs_segment_buffer *segbuf = last;
1477 int ret;
1478
1479 list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) {
1480 sci->sc_segbuf_nblocks -= segbuf->sb_rest_blocks;
1481 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1482 WARN_ON(ret);
1483 }
1484 nilfs_truncate_logs(&sci->sc_segbufs, last);
1485}
1486
1487
1488static int nilfs_segctor_collect(struct nilfs_sc_info *sci,
1489 struct the_nilfs *nilfs, int mode)
1490{
1491 struct nilfs_cstage prev_stage = sci->sc_stage;
1492 int err, nadd = 1;
1493
1494 /* Collection retry loop */
1495 for (;;) {
1496 sci->sc_nblk_this_inc = 0;
1497 sci->sc_curseg = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
1498
1499 err = nilfs_segctor_reset_segment_buffer(sci);
1500 if (unlikely(err))
1501 goto failed;
1502
1503 err = nilfs_segctor_collect_blocks(sci, mode);
1504 sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
1505 if (!err)
1506 break;
1507
1508 if (unlikely(err != -E2BIG))
1509 goto failed;
1510
1511 /* The current segment is filled up */
1512 if (mode != SC_LSEG_SR ||
1513 nilfs_sc_cstage_get(sci) < NILFS_ST_CPFILE)
1514 break;
1515
1516 nilfs_clear_logs(&sci->sc_segbufs);
1517
1518 if (sci->sc_stage.flags & NILFS_CF_SUFREED) {
1519 err = nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1520 sci->sc_freesegs,
1521 sci->sc_nfreesegs,
1522 NULL);
1523 WARN_ON(err); /* do not happen */
1524 sci->sc_stage.flags &= ~NILFS_CF_SUFREED;
1525 }
1526
1527 err = nilfs_segctor_extend_segments(sci, nilfs, nadd);
1528 if (unlikely(err))
1529 return err;
1530
1531 nadd = min_t(int, nadd << 1, SC_MAX_SEGDELTA);
1532 sci->sc_stage = prev_stage;
1533 }
1534 nilfs_segctor_truncate_segments(sci, sci->sc_curseg, nilfs->ns_sufile);
1535 return 0;
1536
1537 failed:
1538 return err;
1539}
1540
1541static void nilfs_list_replace_buffer(struct buffer_head *old_bh,
1542 struct buffer_head *new_bh)
1543{
1544 BUG_ON(!list_empty(&new_bh->b_assoc_buffers));
1545
1546 list_replace_init(&old_bh->b_assoc_buffers, &new_bh->b_assoc_buffers);
1547 /* The caller must release old_bh */
1548}
1549
1550static int
1551nilfs_segctor_update_payload_blocknr(struct nilfs_sc_info *sci,
1552 struct nilfs_segment_buffer *segbuf,
1553 int mode)
1554{
1555 struct inode *inode = NULL;
1556 sector_t blocknr;
1557 unsigned long nfinfo = segbuf->sb_sum.nfinfo;
1558 unsigned long nblocks = 0, ndatablk = 0;
1559 const struct nilfs_sc_operations *sc_op = NULL;
1560 struct nilfs_segsum_pointer ssp;
1561 struct nilfs_finfo *finfo = NULL;
1562 union nilfs_binfo binfo;
1563 struct buffer_head *bh, *bh_org;
1564 ino_t ino = 0;
1565 int err = 0;
1566
1567 if (!nfinfo)
1568 goto out;
1569
1570 blocknr = segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk;
1571 ssp.bh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers);
1572 ssp.offset = sizeof(struct nilfs_segment_summary);
1573
1574 list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
1575 if (bh == segbuf->sb_super_root)
1576 break;
1577 if (!finfo) {
1578 finfo = nilfs_segctor_map_segsum_entry(
1579 sci, &ssp, sizeof(*finfo));
1580 ino = le64_to_cpu(finfo->fi_ino);
1581 nblocks = le32_to_cpu(finfo->fi_nblocks);
1582 ndatablk = le32_to_cpu(finfo->fi_ndatablk);
1583
1584 inode = bh->b_page->mapping->host;
1585
1586 if (mode == SC_LSEG_DSYNC)
1587 sc_op = &nilfs_sc_dsync_ops;
1588 else if (ino == NILFS_DAT_INO)
1589 sc_op = &nilfs_sc_dat_ops;
1590 else /* file blocks */
1591 sc_op = &nilfs_sc_file_ops;
1592 }
1593 bh_org = bh;
1594 get_bh(bh_org);
1595 err = nilfs_bmap_assign(NILFS_I(inode)->i_bmap, &bh, blocknr,
1596 &binfo);
1597 if (bh != bh_org)
1598 nilfs_list_replace_buffer(bh_org, bh);
1599 brelse(bh_org);
1600 if (unlikely(err))
1601 goto failed_bmap;
1602
1603 if (ndatablk > 0)
1604 sc_op->write_data_binfo(sci, &ssp, &binfo);
1605 else
1606 sc_op->write_node_binfo(sci, &ssp, &binfo);
1607
1608 blocknr++;
1609 if (--nblocks == 0) {
1610 finfo = NULL;
1611 if (--nfinfo == 0)
1612 break;
1613 } else if (ndatablk > 0)
1614 ndatablk--;
1615 }
1616 out:
1617 return 0;
1618
1619 failed_bmap:
1620 return err;
1621}
1622
1623static int nilfs_segctor_assign(struct nilfs_sc_info *sci, int mode)
1624{
1625 struct nilfs_segment_buffer *segbuf;
1626 int err;
1627
1628 list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
1629 err = nilfs_segctor_update_payload_blocknr(sci, segbuf, mode);
1630 if (unlikely(err))
1631 return err;
1632 nilfs_segbuf_fill_in_segsum(segbuf);
1633 }
1634 return 0;
1635}
1636
1637static void nilfs_begin_page_io(struct page *page)
1638{
1639 if (!page || PageWriteback(page))
1640 /*
1641 * For split b-tree node pages, this function may be called
1642 * twice. We ignore the 2nd or later calls by this check.
1643 */
1644 return;
1645
1646 lock_page(page);
1647 clear_page_dirty_for_io(page);
1648 set_page_writeback(page);
1649 unlock_page(page);
1650}
1651
1652static void nilfs_segctor_prepare_write(struct nilfs_sc_info *sci)
1653{
1654 struct nilfs_segment_buffer *segbuf;
1655 struct page *bd_page = NULL, *fs_page = NULL;
1656
1657 list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
1658 struct buffer_head *bh;
1659
1660 list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
1661 b_assoc_buffers) {
1662 if (bh->b_page != bd_page) {
1663 if (bd_page) {
1664 lock_page(bd_page);
1665 clear_page_dirty_for_io(bd_page);
1666 set_page_writeback(bd_page);
1667 unlock_page(bd_page);
1668 }
1669 bd_page = bh->b_page;
1670 }
1671 }
1672
1673 list_for_each_entry(bh, &segbuf->sb_payload_buffers,
1674 b_assoc_buffers) {
1675 set_buffer_async_write(bh);
1676 if (bh == segbuf->sb_super_root) {
1677 if (bh->b_page != bd_page) {
1678 lock_page(bd_page);
1679 clear_page_dirty_for_io(bd_page);
1680 set_page_writeback(bd_page);
1681 unlock_page(bd_page);
1682 bd_page = bh->b_page;
1683 }
1684 break;
1685 }
1686 if (bh->b_page != fs_page) {
1687 nilfs_begin_page_io(fs_page);
1688 fs_page = bh->b_page;
1689 }
1690 }
1691 }
1692 if (bd_page) {
1693 lock_page(bd_page);
1694 clear_page_dirty_for_io(bd_page);
1695 set_page_writeback(bd_page);
1696 unlock_page(bd_page);
1697 }
1698 nilfs_begin_page_io(fs_page);
1699}
1700
1701static int nilfs_segctor_write(struct nilfs_sc_info *sci,
1702 struct the_nilfs *nilfs)
1703{
1704 int ret;
1705
1706 ret = nilfs_write_logs(&sci->sc_segbufs, nilfs);
1707 list_splice_tail_init(&sci->sc_segbufs, &sci->sc_write_logs);
1708 return ret;
1709}
1710
1711static void nilfs_end_page_io(struct page *page, int err)
1712{
1713 if (!page)
1714 return;
1715
1716 if (buffer_nilfs_node(page_buffers(page)) && !PageWriteback(page)) {
1717 /*
1718 * For b-tree node pages, this function may be called twice
1719 * or more because they might be split in a segment.
1720 */
1721 if (PageDirty(page)) {
1722 /*
1723 * For pages holding split b-tree node buffers, dirty
1724 * flag on the buffers may be cleared discretely.
1725 * In that case, the page is once redirtied for
1726 * remaining buffers, and it must be cancelled if
1727 * all the buffers get cleaned later.
1728 */
1729 lock_page(page);
1730 if (nilfs_page_buffers_clean(page))
1731 __nilfs_clear_page_dirty(page);
1732 unlock_page(page);
1733 }
1734 return;
1735 }
1736
1737 if (!err) {
1738 if (!nilfs_page_buffers_clean(page))
1739 __set_page_dirty_nobuffers(page);
1740 ClearPageError(page);
1741 } else {
1742 __set_page_dirty_nobuffers(page);
1743 SetPageError(page);
1744 }
1745
1746 end_page_writeback(page);
1747}
1748
1749static void nilfs_abort_logs(struct list_head *logs, int err)
1750{
1751 struct nilfs_segment_buffer *segbuf;
1752 struct page *bd_page = NULL, *fs_page = NULL;
1753 struct buffer_head *bh;
1754
1755 if (list_empty(logs))
1756 return;
1757
1758 list_for_each_entry(segbuf, logs, sb_list) {
1759 list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
1760 b_assoc_buffers) {
1761 if (bh->b_page != bd_page) {
1762 if (bd_page)
1763 end_page_writeback(bd_page);
1764 bd_page = bh->b_page;
1765 }
1766 }
1767
1768 list_for_each_entry(bh, &segbuf->sb_payload_buffers,
1769 b_assoc_buffers) {
1770 clear_buffer_async_write(bh);
1771 if (bh == segbuf->sb_super_root) {
1772 if (bh->b_page != bd_page) {
1773 end_page_writeback(bd_page);
1774 bd_page = bh->b_page;
1775 }
1776 break;
1777 }
1778 if (bh->b_page != fs_page) {
1779 nilfs_end_page_io(fs_page, err);
1780 fs_page = bh->b_page;
1781 }
1782 }
1783 }
1784 if (bd_page)
1785 end_page_writeback(bd_page);
1786
1787 nilfs_end_page_io(fs_page, err);
1788}
1789
1790static void nilfs_segctor_abort_construction(struct nilfs_sc_info *sci,
1791 struct the_nilfs *nilfs, int err)
1792{
1793 LIST_HEAD(logs);
1794 int ret;
1795
1796 list_splice_tail_init(&sci->sc_write_logs, &logs);
1797 ret = nilfs_wait_on_logs(&logs);
1798 nilfs_abort_logs(&logs, ret ? : err);
1799
1800 list_splice_tail_init(&sci->sc_segbufs, &logs);
1801 nilfs_cancel_segusage(&logs, nilfs->ns_sufile);
1802 nilfs_free_incomplete_logs(&logs, nilfs);
1803
1804 if (sci->sc_stage.flags & NILFS_CF_SUFREED) {
1805 ret = nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1806 sci->sc_freesegs,
1807 sci->sc_nfreesegs,
1808 NULL);
1809 WARN_ON(ret); /* do not happen */
1810 }
1811
1812 nilfs_destroy_logs(&logs);
1813}
1814
1815static void nilfs_set_next_segment(struct the_nilfs *nilfs,
1816 struct nilfs_segment_buffer *segbuf)
1817{
1818 nilfs->ns_segnum = segbuf->sb_segnum;
1819 nilfs->ns_nextnum = segbuf->sb_nextnum;
1820 nilfs->ns_pseg_offset = segbuf->sb_pseg_start - segbuf->sb_fseg_start
1821 + segbuf->sb_sum.nblocks;
1822 nilfs->ns_seg_seq = segbuf->sb_sum.seg_seq;
1823 nilfs->ns_ctime = segbuf->sb_sum.ctime;
1824}
1825
1826static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
1827{
1828 struct nilfs_segment_buffer *segbuf;
1829 struct page *bd_page = NULL, *fs_page = NULL;
1830 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
1831 int update_sr = false;
1832
1833 list_for_each_entry(segbuf, &sci->sc_write_logs, sb_list) {
1834 struct buffer_head *bh;
1835
1836 list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
1837 b_assoc_buffers) {
1838 set_buffer_uptodate(bh);
1839 clear_buffer_dirty(bh);
1840 if (bh->b_page != bd_page) {
1841 if (bd_page)
1842 end_page_writeback(bd_page);
1843 bd_page = bh->b_page;
1844 }
1845 }
1846 /*
1847 * We assume that the buffers which belong to the same page
1848 * continue over the buffer list.
1849 * Under this assumption, the last BHs of pages is
1850 * identifiable by the discontinuity of bh->b_page
1851 * (page != fs_page).
1852 *
1853 * For B-tree node blocks, however, this assumption is not
1854 * guaranteed. The cleanup code of B-tree node pages needs
1855 * special care.
1856 */
1857 list_for_each_entry(bh, &segbuf->sb_payload_buffers,
1858 b_assoc_buffers) {
1859 const unsigned long set_bits = BIT(BH_Uptodate);
1860 const unsigned long clear_bits =
1861 (BIT(BH_Dirty) | BIT(BH_Async_Write) |
1862 BIT(BH_Delay) | BIT(BH_NILFS_Volatile) |
1863 BIT(BH_NILFS_Redirected));
1864
1865 set_mask_bits(&bh->b_state, clear_bits, set_bits);
1866 if (bh == segbuf->sb_super_root) {
1867 if (bh->b_page != bd_page) {
1868 end_page_writeback(bd_page);
1869 bd_page = bh->b_page;
1870 }
1871 update_sr = true;
1872 break;
1873 }
1874 if (bh->b_page != fs_page) {
1875 nilfs_end_page_io(fs_page, 0);
1876 fs_page = bh->b_page;
1877 }
1878 }
1879
1880 if (!nilfs_segbuf_simplex(segbuf)) {
1881 if (segbuf->sb_sum.flags & NILFS_SS_LOGBGN) {
1882 set_bit(NILFS_SC_UNCLOSED, &sci->sc_flags);
1883 sci->sc_lseg_stime = jiffies;
1884 }
1885 if (segbuf->sb_sum.flags & NILFS_SS_LOGEND)
1886 clear_bit(NILFS_SC_UNCLOSED, &sci->sc_flags);
1887 }
1888 }
1889 /*
1890 * Since pages may continue over multiple segment buffers,
1891 * end of the last page must be checked outside of the loop.
1892 */
1893 if (bd_page)
1894 end_page_writeback(bd_page);
1895
1896 nilfs_end_page_io(fs_page, 0);
1897
1898 nilfs_drop_collected_inodes(&sci->sc_dirty_files);
1899
1900 if (nilfs_doing_gc())
1901 nilfs_drop_collected_inodes(&sci->sc_gc_inodes);
1902 else
1903 nilfs->ns_nongc_ctime = sci->sc_seg_ctime;
1904
1905 sci->sc_nblk_inc += sci->sc_nblk_this_inc;
1906
1907 segbuf = NILFS_LAST_SEGBUF(&sci->sc_write_logs);
1908 nilfs_set_next_segment(nilfs, segbuf);
1909
1910 if (update_sr) {
1911 nilfs->ns_flushed_device = 0;
1912 nilfs_set_last_segment(nilfs, segbuf->sb_pseg_start,
1913 segbuf->sb_sum.seg_seq, nilfs->ns_cno++);
1914
1915 clear_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
1916 clear_bit(NILFS_SC_DIRTY, &sci->sc_flags);
1917 set_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags);
1918 nilfs_segctor_clear_metadata_dirty(sci);
1919 } else
1920 clear_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags);
1921}
1922
1923static int nilfs_segctor_wait(struct nilfs_sc_info *sci)
1924{
1925 int ret;
1926
1927 ret = nilfs_wait_on_logs(&sci->sc_write_logs);
1928 if (!ret) {
1929 nilfs_segctor_complete_write(sci);
1930 nilfs_destroy_logs(&sci->sc_write_logs);
1931 }
1932 return ret;
1933}
1934
1935static int nilfs_segctor_collect_dirty_files(struct nilfs_sc_info *sci,
1936 struct the_nilfs *nilfs)
1937{
1938 struct nilfs_inode_info *ii, *n;
1939 struct inode *ifile = sci->sc_root->ifile;
1940
1941 spin_lock(&nilfs->ns_inode_lock);
1942 retry:
1943 list_for_each_entry_safe(ii, n, &nilfs->ns_dirty_files, i_dirty) {
1944 if (!ii->i_bh) {
1945 struct buffer_head *ibh;
1946 int err;
1947
1948 spin_unlock(&nilfs->ns_inode_lock);
1949 err = nilfs_ifile_get_inode_block(
1950 ifile, ii->vfs_inode.i_ino, &ibh);
1951 if (unlikely(err)) {
1952 nilfs_msg(sci->sc_super, KERN_WARNING,
1953 "log writer: error %d getting inode block (ino=%lu)",
1954 err, ii->vfs_inode.i_ino);
1955 return err;
1956 }
1957 spin_lock(&nilfs->ns_inode_lock);
1958 if (likely(!ii->i_bh))
1959 ii->i_bh = ibh;
1960 else
1961 brelse(ibh);
1962 goto retry;
1963 }
1964
1965 // Always redirty the buffer to avoid race condition
1966 mark_buffer_dirty(ii->i_bh);
1967 nilfs_mdt_mark_dirty(ifile);
1968
1969 clear_bit(NILFS_I_QUEUED, &ii->i_state);
1970 set_bit(NILFS_I_BUSY, &ii->i_state);
1971 list_move_tail(&ii->i_dirty, &sci->sc_dirty_files);
1972 }
1973 spin_unlock(&nilfs->ns_inode_lock);
1974
1975 return 0;
1976}
1977
1978static void nilfs_segctor_drop_written_files(struct nilfs_sc_info *sci,
1979 struct the_nilfs *nilfs)
1980{
1981 struct nilfs_inode_info *ii, *n;
1982 int during_mount = !(sci->sc_super->s_flags & SB_ACTIVE);
1983 int defer_iput = false;
1984
1985 spin_lock(&nilfs->ns_inode_lock);
1986 list_for_each_entry_safe(ii, n, &sci->sc_dirty_files, i_dirty) {
1987 if (!test_and_clear_bit(NILFS_I_UPDATED, &ii->i_state) ||
1988 test_bit(NILFS_I_DIRTY, &ii->i_state))
1989 continue;
1990
1991 clear_bit(NILFS_I_BUSY, &ii->i_state);
1992 brelse(ii->i_bh);
1993 ii->i_bh = NULL;
1994 list_del_init(&ii->i_dirty);
1995 if (!ii->vfs_inode.i_nlink || during_mount) {
1996 /*
1997 * Defer calling iput() to avoid deadlocks if
1998 * i_nlink == 0 or mount is not yet finished.
1999 */
2000 list_add_tail(&ii->i_dirty, &sci->sc_iput_queue);
2001 defer_iput = true;
2002 } else {
2003 spin_unlock(&nilfs->ns_inode_lock);
2004 iput(&ii->vfs_inode);
2005 spin_lock(&nilfs->ns_inode_lock);
2006 }
2007 }
2008 spin_unlock(&nilfs->ns_inode_lock);
2009
2010 if (defer_iput)
2011 schedule_work(&sci->sc_iput_work);
2012}
2013
2014/*
2015 * Main procedure of segment constructor
2016 */
2017static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
2018{
2019 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
2020 int err;
2021
2022 nilfs_sc_cstage_set(sci, NILFS_ST_INIT);
2023 sci->sc_cno = nilfs->ns_cno;
2024
2025 err = nilfs_segctor_collect_dirty_files(sci, nilfs);
2026 if (unlikely(err))
2027 goto out;
2028
2029 if (nilfs_test_metadata_dirty(nilfs, sci->sc_root))
2030 set_bit(NILFS_SC_DIRTY, &sci->sc_flags);
2031
2032 if (nilfs_segctor_clean(sci))
2033 goto out;
2034
2035 do {
2036 sci->sc_stage.flags &= ~NILFS_CF_HISTORY_MASK;
2037
2038 err = nilfs_segctor_begin_construction(sci, nilfs);
2039 if (unlikely(err))
2040 goto out;
2041
2042 /* Update time stamp */
2043 sci->sc_seg_ctime = ktime_get_real_seconds();
2044
2045 err = nilfs_segctor_collect(sci, nilfs, mode);
2046 if (unlikely(err))
2047 goto failed;
2048
2049 /* Avoid empty segment */
2050 if (nilfs_sc_cstage_get(sci) == NILFS_ST_DONE &&
2051 nilfs_segbuf_empty(sci->sc_curseg)) {
2052 nilfs_segctor_abort_construction(sci, nilfs, 1);
2053 goto out;
2054 }
2055
2056 err = nilfs_segctor_assign(sci, mode);
2057 if (unlikely(err))
2058 goto failed;
2059
2060 if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
2061 nilfs_segctor_fill_in_file_bmap(sci);
2062
2063 if (mode == SC_LSEG_SR &&
2064 nilfs_sc_cstage_get(sci) >= NILFS_ST_CPFILE) {
2065 err = nilfs_segctor_fill_in_checkpoint(sci);
2066 if (unlikely(err))
2067 goto failed_to_write;
2068
2069 nilfs_segctor_fill_in_super_root(sci, nilfs);
2070 }
2071 nilfs_segctor_update_segusage(sci, nilfs->ns_sufile);
2072
2073 /* Write partial segments */
2074 nilfs_segctor_prepare_write(sci);
2075
2076 nilfs_add_checksums_on_logs(&sci->sc_segbufs,
2077 nilfs->ns_crc_seed);
2078
2079 err = nilfs_segctor_write(sci, nilfs);
2080 if (unlikely(err))
2081 goto failed_to_write;
2082
2083 if (nilfs_sc_cstage_get(sci) == NILFS_ST_DONE ||
2084 nilfs->ns_blocksize_bits != PAGE_SHIFT) {
2085 /*
2086 * At this point, we avoid double buffering
2087 * for blocksize < pagesize because page dirty
2088 * flag is turned off during write and dirty
2089 * buffers are not properly collected for
2090 * pages crossing over segments.
2091 */
2092 err = nilfs_segctor_wait(sci);
2093 if (err)
2094 goto failed_to_write;
2095 }
2096 } while (nilfs_sc_cstage_get(sci) != NILFS_ST_DONE);
2097
2098 out:
2099 nilfs_segctor_drop_written_files(sci, nilfs);
2100 return err;
2101
2102 failed_to_write:
2103 if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
2104 nilfs_redirty_inodes(&sci->sc_dirty_files);
2105
2106 failed:
2107 if (nilfs_doing_gc())
2108 nilfs_redirty_inodes(&sci->sc_gc_inodes);
2109 nilfs_segctor_abort_construction(sci, nilfs, err);
2110 goto out;
2111}
2112
2113/**
2114 * nilfs_segctor_start_timer - set timer of background write
2115 * @sci: nilfs_sc_info
2116 *
2117 * If the timer has already been set, it ignores the new request.
2118 * This function MUST be called within a section locking the segment
2119 * semaphore.
2120 */
2121static void nilfs_segctor_start_timer(struct nilfs_sc_info *sci)
2122{
2123 spin_lock(&sci->sc_state_lock);
2124 if (!(sci->sc_state & NILFS_SEGCTOR_COMMIT)) {
2125 sci->sc_timer.expires = jiffies + sci->sc_interval;
2126 add_timer(&sci->sc_timer);
2127 sci->sc_state |= NILFS_SEGCTOR_COMMIT;
2128 }
2129 spin_unlock(&sci->sc_state_lock);
2130}
2131
2132static void nilfs_segctor_do_flush(struct nilfs_sc_info *sci, int bn)
2133{
2134 spin_lock(&sci->sc_state_lock);
2135 if (!(sci->sc_flush_request & BIT(bn))) {
2136 unsigned long prev_req = sci->sc_flush_request;
2137
2138 sci->sc_flush_request |= BIT(bn);
2139 if (!prev_req)
2140 wake_up(&sci->sc_wait_daemon);
2141 }
2142 spin_unlock(&sci->sc_state_lock);
2143}
2144
2145/**
2146 * nilfs_flush_segment - trigger a segment construction for resource control
2147 * @sb: super block
2148 * @ino: inode number of the file to be flushed out.
2149 */
2150void nilfs_flush_segment(struct super_block *sb, ino_t ino)
2151{
2152 struct the_nilfs *nilfs = sb->s_fs_info;
2153 struct nilfs_sc_info *sci = nilfs->ns_writer;
2154
2155 if (!sci || nilfs_doing_construction())
2156 return;
2157 nilfs_segctor_do_flush(sci, NILFS_MDT_INODE(sb, ino) ? ino : 0);
2158 /* assign bit 0 to data files */
2159}
2160
2161struct nilfs_segctor_wait_request {
2162 wait_queue_entry_t wq;
2163 __u32 seq;
2164 int err;
2165 atomic_t done;
2166};
2167
2168static int nilfs_segctor_sync(struct nilfs_sc_info *sci)
2169{
2170 struct nilfs_segctor_wait_request wait_req;
2171 int err = 0;
2172
2173 spin_lock(&sci->sc_state_lock);
2174 init_wait(&wait_req.wq);
2175 wait_req.err = 0;
2176 atomic_set(&wait_req.done, 0);
2177 wait_req.seq = ++sci->sc_seq_request;
2178 spin_unlock(&sci->sc_state_lock);
2179
2180 init_waitqueue_entry(&wait_req.wq, current);
2181 add_wait_queue(&sci->sc_wait_request, &wait_req.wq);
2182 set_current_state(TASK_INTERRUPTIBLE);
2183 wake_up(&sci->sc_wait_daemon);
2184
2185 for (;;) {
2186 if (atomic_read(&wait_req.done)) {
2187 err = wait_req.err;
2188 break;
2189 }
2190 if (!signal_pending(current)) {
2191 schedule();
2192 continue;
2193 }
2194 err = -ERESTARTSYS;
2195 break;
2196 }
2197 finish_wait(&sci->sc_wait_request, &wait_req.wq);
2198 return err;
2199}
2200
2201static void nilfs_segctor_wakeup(struct nilfs_sc_info *sci, int err)
2202{
2203 struct nilfs_segctor_wait_request *wrq, *n;
2204 unsigned long flags;
2205
2206 spin_lock_irqsave(&sci->sc_wait_request.lock, flags);
2207 list_for_each_entry_safe(wrq, n, &sci->sc_wait_request.head, wq.entry) {
2208 if (!atomic_read(&wrq->done) &&
2209 nilfs_cnt32_ge(sci->sc_seq_done, wrq->seq)) {
2210 wrq->err = err;
2211 atomic_set(&wrq->done, 1);
2212 }
2213 if (atomic_read(&wrq->done)) {
2214 wrq->wq.func(&wrq->wq,
2215 TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE,
2216 0, NULL);
2217 }
2218 }
2219 spin_unlock_irqrestore(&sci->sc_wait_request.lock, flags);
2220}
2221
2222/**
2223 * nilfs_construct_segment - construct a logical segment
2224 * @sb: super block
2225 *
2226 * Return Value: On success, 0 is retured. On errors, one of the following
2227 * negative error code is returned.
2228 *
2229 * %-EROFS - Read only filesystem.
2230 *
2231 * %-EIO - I/O error
2232 *
2233 * %-ENOSPC - No space left on device (only in a panic state).
2234 *
2235 * %-ERESTARTSYS - Interrupted.
2236 *
2237 * %-ENOMEM - Insufficient memory available.
2238 */
2239int nilfs_construct_segment(struct super_block *sb)
2240{
2241 struct the_nilfs *nilfs = sb->s_fs_info;
2242 struct nilfs_sc_info *sci = nilfs->ns_writer;
2243 struct nilfs_transaction_info *ti;
2244 int err;
2245
2246 if (!sci)
2247 return -EROFS;
2248
2249 /* A call inside transactions causes a deadlock. */
2250 BUG_ON((ti = current->journal_info) && ti->ti_magic == NILFS_TI_MAGIC);
2251
2252 err = nilfs_segctor_sync(sci);
2253 return err;
2254}
2255
2256/**
2257 * nilfs_construct_dsync_segment - construct a data-only logical segment
2258 * @sb: super block
2259 * @inode: inode whose data blocks should be written out
2260 * @start: start byte offset
2261 * @end: end byte offset (inclusive)
2262 *
2263 * Return Value: On success, 0 is retured. On errors, one of the following
2264 * negative error code is returned.
2265 *
2266 * %-EROFS - Read only filesystem.
2267 *
2268 * %-EIO - I/O error
2269 *
2270 * %-ENOSPC - No space left on device (only in a panic state).
2271 *
2272 * %-ERESTARTSYS - Interrupted.
2273 *
2274 * %-ENOMEM - Insufficient memory available.
2275 */
2276int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode,
2277 loff_t start, loff_t end)
2278{
2279 struct the_nilfs *nilfs = sb->s_fs_info;
2280 struct nilfs_sc_info *sci = nilfs->ns_writer;
2281 struct nilfs_inode_info *ii;
2282 struct nilfs_transaction_info ti;
2283 int err = 0;
2284
2285 if (!sci)
2286 return -EROFS;
2287
2288 nilfs_transaction_lock(sb, &ti, 0);
2289
2290 ii = NILFS_I(inode);
2291 if (test_bit(NILFS_I_INODE_SYNC, &ii->i_state) ||
2292 nilfs_test_opt(nilfs, STRICT_ORDER) ||
2293 test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) ||
2294 nilfs_discontinued(nilfs)) {
2295 nilfs_transaction_unlock(sb);
2296 err = nilfs_segctor_sync(sci);
2297 return err;
2298 }
2299
2300 spin_lock(&nilfs->ns_inode_lock);
2301 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
2302 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
2303 spin_unlock(&nilfs->ns_inode_lock);
2304 nilfs_transaction_unlock(sb);
2305 return 0;
2306 }
2307 spin_unlock(&nilfs->ns_inode_lock);
2308 sci->sc_dsync_inode = ii;
2309 sci->sc_dsync_start = start;
2310 sci->sc_dsync_end = end;
2311
2312 err = nilfs_segctor_do_construct(sci, SC_LSEG_DSYNC);
2313 if (!err)
2314 nilfs->ns_flushed_device = 0;
2315
2316 nilfs_transaction_unlock(sb);
2317 return err;
2318}
2319
2320#define FLUSH_FILE_BIT (0x1) /* data file only */
2321#define FLUSH_DAT_BIT BIT(NILFS_DAT_INO) /* DAT only */
2322
2323/**
2324 * nilfs_segctor_accept - record accepted sequence count of log-write requests
2325 * @sci: segment constructor object
2326 */
2327static void nilfs_segctor_accept(struct nilfs_sc_info *sci)
2328{
2329 spin_lock(&sci->sc_state_lock);
2330 sci->sc_seq_accepted = sci->sc_seq_request;
2331 spin_unlock(&sci->sc_state_lock);
2332 del_timer_sync(&sci->sc_timer);
2333}
2334
2335/**
2336 * nilfs_segctor_notify - notify the result of request to caller threads
2337 * @sci: segment constructor object
2338 * @mode: mode of log forming
2339 * @err: error code to be notified
2340 */
2341static void nilfs_segctor_notify(struct nilfs_sc_info *sci, int mode, int err)
2342{
2343 /* Clear requests (even when the construction failed) */
2344 spin_lock(&sci->sc_state_lock);
2345
2346 if (mode == SC_LSEG_SR) {
2347 sci->sc_state &= ~NILFS_SEGCTOR_COMMIT;
2348 sci->sc_seq_done = sci->sc_seq_accepted;
2349 nilfs_segctor_wakeup(sci, err);
2350 sci->sc_flush_request = 0;
2351 } else {
2352 if (mode == SC_FLUSH_FILE)
2353 sci->sc_flush_request &= ~FLUSH_FILE_BIT;
2354 else if (mode == SC_FLUSH_DAT)
2355 sci->sc_flush_request &= ~FLUSH_DAT_BIT;
2356
2357 /* re-enable timer if checkpoint creation was not done */
2358 if ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
2359 time_before(jiffies, sci->sc_timer.expires))
2360 add_timer(&sci->sc_timer);
2361 }
2362 spin_unlock(&sci->sc_state_lock);
2363}
2364
2365/**
2366 * nilfs_segctor_construct - form logs and write them to disk
2367 * @sci: segment constructor object
2368 * @mode: mode of log forming
2369 */
2370static int nilfs_segctor_construct(struct nilfs_sc_info *sci, int mode)
2371{
2372 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
2373 struct nilfs_super_block **sbp;
2374 int err = 0;
2375
2376 nilfs_segctor_accept(sci);
2377
2378 if (nilfs_discontinued(nilfs))
2379 mode = SC_LSEG_SR;
2380 if (!nilfs_segctor_confirm(sci))
2381 err = nilfs_segctor_do_construct(sci, mode);
2382
2383 if (likely(!err)) {
2384 if (mode != SC_FLUSH_DAT)
2385 atomic_set(&nilfs->ns_ndirtyblks, 0);
2386 if (test_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags) &&
2387 nilfs_discontinued(nilfs)) {
2388 down_write(&nilfs->ns_sem);
2389 err = -EIO;
2390 sbp = nilfs_prepare_super(sci->sc_super,
2391 nilfs_sb_will_flip(nilfs));
2392 if (likely(sbp)) {
2393 nilfs_set_log_cursor(sbp[0], nilfs);
2394 err = nilfs_commit_super(sci->sc_super,
2395 NILFS_SB_COMMIT);
2396 }
2397 up_write(&nilfs->ns_sem);
2398 }
2399 }
2400
2401 nilfs_segctor_notify(sci, mode, err);
2402 return err;
2403}
2404
2405static void nilfs_construction_timeout(struct timer_list *t)
2406{
2407 struct nilfs_sc_info *sci = from_timer(sci, t, sc_timer);
2408
2409 wake_up_process(sci->sc_timer_task);
2410}
2411
2412static void
2413nilfs_remove_written_gcinodes(struct the_nilfs *nilfs, struct list_head *head)
2414{
2415 struct nilfs_inode_info *ii, *n;
2416
2417 list_for_each_entry_safe(ii, n, head, i_dirty) {
2418 if (!test_bit(NILFS_I_UPDATED, &ii->i_state))
2419 continue;
2420 list_del_init(&ii->i_dirty);
2421 truncate_inode_pages(&ii->vfs_inode.i_data, 0);
2422 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
2423 iput(&ii->vfs_inode);
2424 }
2425}
2426
2427int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv,
2428 void **kbufs)
2429{
2430 struct the_nilfs *nilfs = sb->s_fs_info;
2431 struct nilfs_sc_info *sci = nilfs->ns_writer;
2432 struct nilfs_transaction_info ti;
2433 int err;
2434
2435 if (unlikely(!sci))
2436 return -EROFS;
2437
2438 nilfs_transaction_lock(sb, &ti, 1);
2439
2440 err = nilfs_mdt_save_to_shadow_map(nilfs->ns_dat);
2441 if (unlikely(err))
2442 goto out_unlock;
2443
2444 err = nilfs_ioctl_prepare_clean_segments(nilfs, argv, kbufs);
2445 if (unlikely(err)) {
2446 nilfs_mdt_restore_from_shadow_map(nilfs->ns_dat);
2447 goto out_unlock;
2448 }
2449
2450 sci->sc_freesegs = kbufs[4];
2451 sci->sc_nfreesegs = argv[4].v_nmembs;
2452 list_splice_tail_init(&nilfs->ns_gc_inodes, &sci->sc_gc_inodes);
2453
2454 for (;;) {
2455 err = nilfs_segctor_construct(sci, SC_LSEG_SR);
2456 nilfs_remove_written_gcinodes(nilfs, &sci->sc_gc_inodes);
2457
2458 if (likely(!err))
2459 break;
2460
2461 nilfs_msg(sb, KERN_WARNING, "error %d cleaning segments", err);
2462 set_current_state(TASK_INTERRUPTIBLE);
2463 schedule_timeout(sci->sc_interval);
2464 }
2465 if (nilfs_test_opt(nilfs, DISCARD)) {
2466 int ret = nilfs_discard_segments(nilfs, sci->sc_freesegs,
2467 sci->sc_nfreesegs);
2468 if (ret) {
2469 nilfs_msg(sb, KERN_WARNING,
2470 "error %d on discard request, turning discards off for the device",
2471 ret);
2472 nilfs_clear_opt(nilfs, DISCARD);
2473 }
2474 }
2475
2476 out_unlock:
2477 sci->sc_freesegs = NULL;
2478 sci->sc_nfreesegs = 0;
2479 nilfs_mdt_clear_shadow_map(nilfs->ns_dat);
2480 nilfs_transaction_unlock(sb);
2481 return err;
2482}
2483
2484static void nilfs_segctor_thread_construct(struct nilfs_sc_info *sci, int mode)
2485{
2486 struct nilfs_transaction_info ti;
2487
2488 nilfs_transaction_lock(sci->sc_super, &ti, 0);
2489 nilfs_segctor_construct(sci, mode);
2490
2491 /*
2492 * Unclosed segment should be retried. We do this using sc_timer.
2493 * Timeout of sc_timer will invoke complete construction which leads
2494 * to close the current logical segment.
2495 */
2496 if (test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags))
2497 nilfs_segctor_start_timer(sci);
2498
2499 nilfs_transaction_unlock(sci->sc_super);
2500}
2501
2502static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *sci)
2503{
2504 int mode = 0;
2505
2506 spin_lock(&sci->sc_state_lock);
2507 mode = (sci->sc_flush_request & FLUSH_DAT_BIT) ?
2508 SC_FLUSH_DAT : SC_FLUSH_FILE;
2509 spin_unlock(&sci->sc_state_lock);
2510
2511 if (mode) {
2512 nilfs_segctor_do_construct(sci, mode);
2513
2514 spin_lock(&sci->sc_state_lock);
2515 sci->sc_flush_request &= (mode == SC_FLUSH_FILE) ?
2516 ~FLUSH_FILE_BIT : ~FLUSH_DAT_BIT;
2517 spin_unlock(&sci->sc_state_lock);
2518 }
2519 clear_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags);
2520}
2521
2522static int nilfs_segctor_flush_mode(struct nilfs_sc_info *sci)
2523{
2524 if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) ||
2525 time_before(jiffies, sci->sc_lseg_stime + sci->sc_mjcp_freq)) {
2526 if (!(sci->sc_flush_request & ~FLUSH_FILE_BIT))
2527 return SC_FLUSH_FILE;
2528 else if (!(sci->sc_flush_request & ~FLUSH_DAT_BIT))
2529 return SC_FLUSH_DAT;
2530 }
2531 return SC_LSEG_SR;
2532}
2533
2534/**
2535 * nilfs_segctor_thread - main loop of the segment constructor thread.
2536 * @arg: pointer to a struct nilfs_sc_info.
2537 *
2538 * nilfs_segctor_thread() initializes a timer and serves as a daemon
2539 * to execute segment constructions.
2540 */
2541static int nilfs_segctor_thread(void *arg)
2542{
2543 struct nilfs_sc_info *sci = (struct nilfs_sc_info *)arg;
2544 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
2545 int timeout = 0;
2546
2547 sci->sc_timer_task = current;
2548
2549 /* start sync. */
2550 sci->sc_task = current;
2551 wake_up(&sci->sc_wait_task); /* for nilfs_segctor_start_thread() */
2552 nilfs_msg(sci->sc_super, KERN_INFO,
2553 "segctord starting. Construction interval = %lu seconds, CP frequency < %lu seconds",
2554 sci->sc_interval / HZ, sci->sc_mjcp_freq / HZ);
2555
2556 spin_lock(&sci->sc_state_lock);
2557 loop:
2558 for (;;) {
2559 int mode;
2560
2561 if (sci->sc_state & NILFS_SEGCTOR_QUIT)
2562 goto end_thread;
2563
2564 if (timeout || sci->sc_seq_request != sci->sc_seq_done)
2565 mode = SC_LSEG_SR;
2566 else if (sci->sc_flush_request)
2567 mode = nilfs_segctor_flush_mode(sci);
2568 else
2569 break;
2570
2571 spin_unlock(&sci->sc_state_lock);
2572 nilfs_segctor_thread_construct(sci, mode);
2573 spin_lock(&sci->sc_state_lock);
2574 timeout = 0;
2575 }
2576
2577
2578 if (freezing(current)) {
2579 spin_unlock(&sci->sc_state_lock);
2580 try_to_freeze();
2581 spin_lock(&sci->sc_state_lock);
2582 } else {
2583 DEFINE_WAIT(wait);
2584 int should_sleep = 1;
2585
2586 prepare_to_wait(&sci->sc_wait_daemon, &wait,
2587 TASK_INTERRUPTIBLE);
2588
2589 if (sci->sc_seq_request != sci->sc_seq_done)
2590 should_sleep = 0;
2591 else if (sci->sc_flush_request)
2592 should_sleep = 0;
2593 else if (sci->sc_state & NILFS_SEGCTOR_COMMIT)
2594 should_sleep = time_before(jiffies,
2595 sci->sc_timer.expires);
2596
2597 if (should_sleep) {
2598 spin_unlock(&sci->sc_state_lock);
2599 schedule();
2600 spin_lock(&sci->sc_state_lock);
2601 }
2602 finish_wait(&sci->sc_wait_daemon, &wait);
2603 timeout = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
2604 time_after_eq(jiffies, sci->sc_timer.expires));
2605
2606 if (nilfs_sb_dirty(nilfs) && nilfs_sb_need_update(nilfs))
2607 set_nilfs_discontinued(nilfs);
2608 }
2609 goto loop;
2610
2611 end_thread:
2612 spin_unlock(&sci->sc_state_lock);
2613
2614 /* end sync. */
2615 sci->sc_task = NULL;
2616 wake_up(&sci->sc_wait_task); /* for nilfs_segctor_kill_thread() */
2617 return 0;
2618}
2619
2620static int nilfs_segctor_start_thread(struct nilfs_sc_info *sci)
2621{
2622 struct task_struct *t;
2623
2624 t = kthread_run(nilfs_segctor_thread, sci, "segctord");
2625 if (IS_ERR(t)) {
2626 int err = PTR_ERR(t);
2627
2628 nilfs_msg(sci->sc_super, KERN_ERR,
2629 "error %d creating segctord thread", err);
2630 return err;
2631 }
2632 wait_event(sci->sc_wait_task, sci->sc_task != NULL);
2633 return 0;
2634}
2635
2636static void nilfs_segctor_kill_thread(struct nilfs_sc_info *sci)
2637 __acquires(&sci->sc_state_lock)
2638 __releases(&sci->sc_state_lock)
2639{
2640 sci->sc_state |= NILFS_SEGCTOR_QUIT;
2641
2642 while (sci->sc_task) {
2643 wake_up(&sci->sc_wait_daemon);
2644 spin_unlock(&sci->sc_state_lock);
2645 wait_event(sci->sc_wait_task, sci->sc_task == NULL);
2646 spin_lock(&sci->sc_state_lock);
2647 }
2648}
2649
2650/*
2651 * Setup & clean-up functions
2652 */
2653static struct nilfs_sc_info *nilfs_segctor_new(struct super_block *sb,
2654 struct nilfs_root *root)
2655{
2656 struct the_nilfs *nilfs = sb->s_fs_info;
2657 struct nilfs_sc_info *sci;
2658
2659 sci = kzalloc(sizeof(*sci), GFP_KERNEL);
2660 if (!sci)
2661 return NULL;
2662
2663 sci->sc_super = sb;
2664
2665 nilfs_get_root(root);
2666 sci->sc_root = root;
2667
2668 init_waitqueue_head(&sci->sc_wait_request);
2669 init_waitqueue_head(&sci->sc_wait_daemon);
2670 init_waitqueue_head(&sci->sc_wait_task);
2671 spin_lock_init(&sci->sc_state_lock);
2672 INIT_LIST_HEAD(&sci->sc_dirty_files);
2673 INIT_LIST_HEAD(&sci->sc_segbufs);
2674 INIT_LIST_HEAD(&sci->sc_write_logs);
2675 INIT_LIST_HEAD(&sci->sc_gc_inodes);
2676 INIT_LIST_HEAD(&sci->sc_iput_queue);
2677 INIT_WORK(&sci->sc_iput_work, nilfs_iput_work_func);
2678 timer_setup(&sci->sc_timer, nilfs_construction_timeout, 0);
2679
2680 sci->sc_interval = HZ * NILFS_SC_DEFAULT_TIMEOUT;
2681 sci->sc_mjcp_freq = HZ * NILFS_SC_DEFAULT_SR_FREQ;
2682 sci->sc_watermark = NILFS_SC_DEFAULT_WATERMARK;
2683
2684 if (nilfs->ns_interval)
2685 sci->sc_interval = HZ * nilfs->ns_interval;
2686 if (nilfs->ns_watermark)
2687 sci->sc_watermark = nilfs->ns_watermark;
2688 return sci;
2689}
2690
2691static void nilfs_segctor_write_out(struct nilfs_sc_info *sci)
2692{
2693 int ret, retrycount = NILFS_SC_CLEANUP_RETRY;
2694
2695 /*
2696 * The segctord thread was stopped and its timer was removed.
2697 * But some tasks remain.
2698 */
2699 do {
2700 struct nilfs_transaction_info ti;
2701
2702 nilfs_transaction_lock(sci->sc_super, &ti, 0);
2703 ret = nilfs_segctor_construct(sci, SC_LSEG_SR);
2704 nilfs_transaction_unlock(sci->sc_super);
2705
2706 flush_work(&sci->sc_iput_work);
2707
2708 } while (ret && retrycount-- > 0);
2709}
2710
2711/**
2712 * nilfs_segctor_destroy - destroy the segment constructor.
2713 * @sci: nilfs_sc_info
2714 *
2715 * nilfs_segctor_destroy() kills the segctord thread and frees
2716 * the nilfs_sc_info struct.
2717 * Caller must hold the segment semaphore.
2718 */
2719static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
2720{
2721 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
2722 int flag;
2723
2724 up_write(&nilfs->ns_segctor_sem);
2725
2726 spin_lock(&sci->sc_state_lock);
2727 nilfs_segctor_kill_thread(sci);
2728 flag = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) || sci->sc_flush_request
2729 || sci->sc_seq_request != sci->sc_seq_done);
2730 spin_unlock(&sci->sc_state_lock);
2731
2732 if (flush_work(&sci->sc_iput_work))
2733 flag = true;
2734
2735 if (flag || !nilfs_segctor_confirm(sci))
2736 nilfs_segctor_write_out(sci);
2737
2738 if (!list_empty(&sci->sc_dirty_files)) {
2739 nilfs_msg(sci->sc_super, KERN_WARNING,
2740 "disposed unprocessed dirty file(s) when stopping log writer");
2741 nilfs_dispose_list(nilfs, &sci->sc_dirty_files, 1);
2742 }
2743
2744 if (!list_empty(&sci->sc_iput_queue)) {
2745 nilfs_msg(sci->sc_super, KERN_WARNING,
2746 "disposed unprocessed inode(s) in iput queue when stopping log writer");
2747 nilfs_dispose_list(nilfs, &sci->sc_iput_queue, 1);
2748 }
2749
2750 WARN_ON(!list_empty(&sci->sc_segbufs));
2751 WARN_ON(!list_empty(&sci->sc_write_logs));
2752
2753 nilfs_put_root(sci->sc_root);
2754
2755 down_write(&nilfs->ns_segctor_sem);
2756
2757 del_timer_sync(&sci->sc_timer);
2758 kfree(sci);
2759}
2760
2761/**
2762 * nilfs_attach_log_writer - attach log writer
2763 * @sb: super block instance
2764 * @root: root object of the current filesystem tree
2765 *
2766 * This allocates a log writer object, initializes it, and starts the
2767 * log writer.
2768 *
2769 * Return Value: On success, 0 is returned. On error, one of the following
2770 * negative error code is returned.
2771 *
2772 * %-ENOMEM - Insufficient memory available.
2773 */
2774int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root)
2775{
2776 struct the_nilfs *nilfs = sb->s_fs_info;
2777 int err;
2778
2779 if (nilfs->ns_writer) {
2780 /*
2781 * This happens if the filesystem was remounted
2782 * read/write after nilfs_error degenerated it into a
2783 * read-only mount.
2784 */
2785 nilfs_detach_log_writer(sb);
2786 }
2787
2788 nilfs->ns_writer = nilfs_segctor_new(sb, root);
2789 if (!nilfs->ns_writer)
2790 return -ENOMEM;
2791
2792 err = nilfs_segctor_start_thread(nilfs->ns_writer);
2793 if (err) {
2794 kfree(nilfs->ns_writer);
2795 nilfs->ns_writer = NULL;
2796 }
2797 return err;
2798}
2799
2800/**
2801 * nilfs_detach_log_writer - destroy log writer
2802 * @sb: super block instance
2803 *
2804 * This kills log writer daemon, frees the log writer object, and
2805 * destroys list of dirty files.
2806 */
2807void nilfs_detach_log_writer(struct super_block *sb)
2808{
2809 struct the_nilfs *nilfs = sb->s_fs_info;
2810 LIST_HEAD(garbage_list);
2811
2812 down_write(&nilfs->ns_segctor_sem);
2813 if (nilfs->ns_writer) {
2814 nilfs_segctor_destroy(nilfs->ns_writer);
2815 nilfs->ns_writer = NULL;
2816 }
2817
2818 /* Force to free the list of dirty files */
2819 spin_lock(&nilfs->ns_inode_lock);
2820 if (!list_empty(&nilfs->ns_dirty_files)) {
2821 list_splice_init(&nilfs->ns_dirty_files, &garbage_list);
2822 nilfs_msg(sb, KERN_WARNING,
2823 "disposed unprocessed dirty file(s) when detaching log writer");
2824 }
2825 spin_unlock(&nilfs->ns_inode_lock);
2826 up_write(&nilfs->ns_segctor_sem);
2827
2828 nilfs_dispose_list(nilfs, &garbage_list, 1);
2829}
1/*
2 * segment.c - NILFS segment constructor.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * Written by Ryusuke Konishi.
17 *
18 */
19
20#include <linux/pagemap.h>
21#include <linux/buffer_head.h>
22#include <linux/writeback.h>
23#include <linux/bitops.h>
24#include <linux/bio.h>
25#include <linux/completion.h>
26#include <linux/blkdev.h>
27#include <linux/backing-dev.h>
28#include <linux/freezer.h>
29#include <linux/kthread.h>
30#include <linux/crc32.h>
31#include <linux/pagevec.h>
32#include <linux/slab.h>
33#include "nilfs.h"
34#include "btnode.h"
35#include "page.h"
36#include "segment.h"
37#include "sufile.h"
38#include "cpfile.h"
39#include "ifile.h"
40#include "segbuf.h"
41
42
43/*
44 * Segment constructor
45 */
46#define SC_N_INODEVEC 16 /* Size of locally allocated inode vector */
47
48#define SC_MAX_SEGDELTA 64 /*
49 * Upper limit of the number of segments
50 * appended in collection retry loop
51 */
52
53/* Construction mode */
54enum {
55 SC_LSEG_SR = 1, /* Make a logical segment having a super root */
56 SC_LSEG_DSYNC, /*
57 * Flush data blocks of a given file and make
58 * a logical segment without a super root.
59 */
60 SC_FLUSH_FILE, /*
61 * Flush data files, leads to segment writes without
62 * creating a checkpoint.
63 */
64 SC_FLUSH_DAT, /*
65 * Flush DAT file. This also creates segments
66 * without a checkpoint.
67 */
68};
69
70/* Stage numbers of dirty block collection */
71enum {
72 NILFS_ST_INIT = 0,
73 NILFS_ST_GC, /* Collecting dirty blocks for GC */
74 NILFS_ST_FILE,
75 NILFS_ST_IFILE,
76 NILFS_ST_CPFILE,
77 NILFS_ST_SUFILE,
78 NILFS_ST_DAT,
79 NILFS_ST_SR, /* Super root */
80 NILFS_ST_DSYNC, /* Data sync blocks */
81 NILFS_ST_DONE,
82};
83
84#define CREATE_TRACE_POINTS
85#include <trace/events/nilfs2.h>
86
87/*
88 * nilfs_sc_cstage_inc(), nilfs_sc_cstage_set(), nilfs_sc_cstage_get() are
89 * wrapper functions of stage count (nilfs_sc_info->sc_stage.scnt). Users of
90 * the variable must use them because transition of stage count must involve
91 * trace events (trace_nilfs2_collection_stage_transition).
92 *
93 * nilfs_sc_cstage_get() isn't required for the above purpose because it doesn't
94 * produce tracepoint events. It is provided just for making the intention
95 * clear.
96 */
97static inline void nilfs_sc_cstage_inc(struct nilfs_sc_info *sci)
98{
99 sci->sc_stage.scnt++;
100 trace_nilfs2_collection_stage_transition(sci);
101}
102
103static inline void nilfs_sc_cstage_set(struct nilfs_sc_info *sci, int next_scnt)
104{
105 sci->sc_stage.scnt = next_scnt;
106 trace_nilfs2_collection_stage_transition(sci);
107}
108
109static inline int nilfs_sc_cstage_get(struct nilfs_sc_info *sci)
110{
111 return sci->sc_stage.scnt;
112}
113
114/* State flags of collection */
115#define NILFS_CF_NODE 0x0001 /* Collecting node blocks */
116#define NILFS_CF_IFILE_STARTED 0x0002 /* IFILE stage has started */
117#define NILFS_CF_SUFREED 0x0004 /* segment usages has been freed */
118#define NILFS_CF_HISTORY_MASK (NILFS_CF_IFILE_STARTED | NILFS_CF_SUFREED)
119
120/* Operations depending on the construction mode and file type */
121struct nilfs_sc_operations {
122 int (*collect_data)(struct nilfs_sc_info *, struct buffer_head *,
123 struct inode *);
124 int (*collect_node)(struct nilfs_sc_info *, struct buffer_head *,
125 struct inode *);
126 int (*collect_bmap)(struct nilfs_sc_info *, struct buffer_head *,
127 struct inode *);
128 void (*write_data_binfo)(struct nilfs_sc_info *,
129 struct nilfs_segsum_pointer *,
130 union nilfs_binfo *);
131 void (*write_node_binfo)(struct nilfs_sc_info *,
132 struct nilfs_segsum_pointer *,
133 union nilfs_binfo *);
134};
135
136/*
137 * Other definitions
138 */
139static void nilfs_segctor_start_timer(struct nilfs_sc_info *);
140static void nilfs_segctor_do_flush(struct nilfs_sc_info *, int);
141static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *);
142static void nilfs_dispose_list(struct the_nilfs *, struct list_head *, int);
143
144#define nilfs_cnt32_gt(a, b) \
145 (typecheck(__u32, a) && typecheck(__u32, b) && \
146 ((__s32)(b) - (__s32)(a) < 0))
147#define nilfs_cnt32_ge(a, b) \
148 (typecheck(__u32, a) && typecheck(__u32, b) && \
149 ((__s32)(a) - (__s32)(b) >= 0))
150#define nilfs_cnt32_lt(a, b) nilfs_cnt32_gt(b, a)
151#define nilfs_cnt32_le(a, b) nilfs_cnt32_ge(b, a)
152
153static int nilfs_prepare_segment_lock(struct super_block *sb,
154 struct nilfs_transaction_info *ti)
155{
156 struct nilfs_transaction_info *cur_ti = current->journal_info;
157 void *save = NULL;
158
159 if (cur_ti) {
160 if (cur_ti->ti_magic == NILFS_TI_MAGIC)
161 return ++cur_ti->ti_count;
162
163 /*
164 * If journal_info field is occupied by other FS,
165 * it is saved and will be restored on
166 * nilfs_transaction_commit().
167 */
168 nilfs_msg(sb, KERN_WARNING, "journal info from a different FS");
169 save = current->journal_info;
170 }
171 if (!ti) {
172 ti = kmem_cache_alloc(nilfs_transaction_cachep, GFP_NOFS);
173 if (!ti)
174 return -ENOMEM;
175 ti->ti_flags = NILFS_TI_DYNAMIC_ALLOC;
176 } else {
177 ti->ti_flags = 0;
178 }
179 ti->ti_count = 0;
180 ti->ti_save = save;
181 ti->ti_magic = NILFS_TI_MAGIC;
182 current->journal_info = ti;
183 return 0;
184}
185
186/**
187 * nilfs_transaction_begin - start indivisible file operations.
188 * @sb: super block
189 * @ti: nilfs_transaction_info
190 * @vacancy_check: flags for vacancy rate checks
191 *
192 * nilfs_transaction_begin() acquires a reader/writer semaphore, called
193 * the segment semaphore, to make a segment construction and write tasks
194 * exclusive. The function is used with nilfs_transaction_commit() in pairs.
195 * The region enclosed by these two functions can be nested. To avoid a
196 * deadlock, the semaphore is only acquired or released in the outermost call.
197 *
198 * This function allocates a nilfs_transaction_info struct to keep context
199 * information on it. It is initialized and hooked onto the current task in
200 * the outermost call. If a pre-allocated struct is given to @ti, it is used
201 * instead; otherwise a new struct is assigned from a slab.
202 *
203 * When @vacancy_check flag is set, this function will check the amount of
204 * free space, and will wait for the GC to reclaim disk space if low capacity.
205 *
206 * Return Value: On success, 0 is returned. On error, one of the following
207 * negative error code is returned.
208 *
209 * %-ENOMEM - Insufficient memory available.
210 *
211 * %-ENOSPC - No space left on device
212 */
213int nilfs_transaction_begin(struct super_block *sb,
214 struct nilfs_transaction_info *ti,
215 int vacancy_check)
216{
217 struct the_nilfs *nilfs;
218 int ret = nilfs_prepare_segment_lock(sb, ti);
219 struct nilfs_transaction_info *trace_ti;
220
221 if (unlikely(ret < 0))
222 return ret;
223 if (ret > 0) {
224 trace_ti = current->journal_info;
225
226 trace_nilfs2_transaction_transition(sb, trace_ti,
227 trace_ti->ti_count, trace_ti->ti_flags,
228 TRACE_NILFS2_TRANSACTION_BEGIN);
229 return 0;
230 }
231
232 sb_start_intwrite(sb);
233
234 nilfs = sb->s_fs_info;
235 down_read(&nilfs->ns_segctor_sem);
236 if (vacancy_check && nilfs_near_disk_full(nilfs)) {
237 up_read(&nilfs->ns_segctor_sem);
238 ret = -ENOSPC;
239 goto failed;
240 }
241
242 trace_ti = current->journal_info;
243 trace_nilfs2_transaction_transition(sb, trace_ti, trace_ti->ti_count,
244 trace_ti->ti_flags,
245 TRACE_NILFS2_TRANSACTION_BEGIN);
246 return 0;
247
248 failed:
249 ti = current->journal_info;
250 current->journal_info = ti->ti_save;
251 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
252 kmem_cache_free(nilfs_transaction_cachep, ti);
253 sb_end_intwrite(sb);
254 return ret;
255}
256
257/**
258 * nilfs_transaction_commit - commit indivisible file operations.
259 * @sb: super block
260 *
261 * nilfs_transaction_commit() releases the read semaphore which is
262 * acquired by nilfs_transaction_begin(). This is only performed
263 * in outermost call of this function. If a commit flag is set,
264 * nilfs_transaction_commit() sets a timer to start the segment
265 * constructor. If a sync flag is set, it starts construction
266 * directly.
267 */
268int nilfs_transaction_commit(struct super_block *sb)
269{
270 struct nilfs_transaction_info *ti = current->journal_info;
271 struct the_nilfs *nilfs = sb->s_fs_info;
272 int err = 0;
273
274 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
275 ti->ti_flags |= NILFS_TI_COMMIT;
276 if (ti->ti_count > 0) {
277 ti->ti_count--;
278 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
279 ti->ti_flags, TRACE_NILFS2_TRANSACTION_COMMIT);
280 return 0;
281 }
282 if (nilfs->ns_writer) {
283 struct nilfs_sc_info *sci = nilfs->ns_writer;
284
285 if (ti->ti_flags & NILFS_TI_COMMIT)
286 nilfs_segctor_start_timer(sci);
287 if (atomic_read(&nilfs->ns_ndirtyblks) > sci->sc_watermark)
288 nilfs_segctor_do_flush(sci, 0);
289 }
290 up_read(&nilfs->ns_segctor_sem);
291 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
292 ti->ti_flags, TRACE_NILFS2_TRANSACTION_COMMIT);
293
294 current->journal_info = ti->ti_save;
295
296 if (ti->ti_flags & NILFS_TI_SYNC)
297 err = nilfs_construct_segment(sb);
298 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
299 kmem_cache_free(nilfs_transaction_cachep, ti);
300 sb_end_intwrite(sb);
301 return err;
302}
303
304void nilfs_transaction_abort(struct super_block *sb)
305{
306 struct nilfs_transaction_info *ti = current->journal_info;
307 struct the_nilfs *nilfs = sb->s_fs_info;
308
309 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
310 if (ti->ti_count > 0) {
311 ti->ti_count--;
312 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
313 ti->ti_flags, TRACE_NILFS2_TRANSACTION_ABORT);
314 return;
315 }
316 up_read(&nilfs->ns_segctor_sem);
317
318 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
319 ti->ti_flags, TRACE_NILFS2_TRANSACTION_ABORT);
320
321 current->journal_info = ti->ti_save;
322 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
323 kmem_cache_free(nilfs_transaction_cachep, ti);
324 sb_end_intwrite(sb);
325}
326
327void nilfs_relax_pressure_in_lock(struct super_block *sb)
328{
329 struct the_nilfs *nilfs = sb->s_fs_info;
330 struct nilfs_sc_info *sci = nilfs->ns_writer;
331
332 if (!sci || !sci->sc_flush_request)
333 return;
334
335 set_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags);
336 up_read(&nilfs->ns_segctor_sem);
337
338 down_write(&nilfs->ns_segctor_sem);
339 if (sci->sc_flush_request &&
340 test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags)) {
341 struct nilfs_transaction_info *ti = current->journal_info;
342
343 ti->ti_flags |= NILFS_TI_WRITER;
344 nilfs_segctor_do_immediate_flush(sci);
345 ti->ti_flags &= ~NILFS_TI_WRITER;
346 }
347 downgrade_write(&nilfs->ns_segctor_sem);
348}
349
350static void nilfs_transaction_lock(struct super_block *sb,
351 struct nilfs_transaction_info *ti,
352 int gcflag)
353{
354 struct nilfs_transaction_info *cur_ti = current->journal_info;
355 struct the_nilfs *nilfs = sb->s_fs_info;
356 struct nilfs_sc_info *sci = nilfs->ns_writer;
357
358 WARN_ON(cur_ti);
359 ti->ti_flags = NILFS_TI_WRITER;
360 ti->ti_count = 0;
361 ti->ti_save = cur_ti;
362 ti->ti_magic = NILFS_TI_MAGIC;
363 current->journal_info = ti;
364
365 for (;;) {
366 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
367 ti->ti_flags, TRACE_NILFS2_TRANSACTION_TRYLOCK);
368
369 down_write(&nilfs->ns_segctor_sem);
370 if (!test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags))
371 break;
372
373 nilfs_segctor_do_immediate_flush(sci);
374
375 up_write(&nilfs->ns_segctor_sem);
376 cond_resched();
377 }
378 if (gcflag)
379 ti->ti_flags |= NILFS_TI_GC;
380
381 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
382 ti->ti_flags, TRACE_NILFS2_TRANSACTION_LOCK);
383}
384
385static void nilfs_transaction_unlock(struct super_block *sb)
386{
387 struct nilfs_transaction_info *ti = current->journal_info;
388 struct the_nilfs *nilfs = sb->s_fs_info;
389
390 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
391 BUG_ON(ti->ti_count > 0);
392
393 up_write(&nilfs->ns_segctor_sem);
394 current->journal_info = ti->ti_save;
395
396 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
397 ti->ti_flags, TRACE_NILFS2_TRANSACTION_UNLOCK);
398}
399
400static void *nilfs_segctor_map_segsum_entry(struct nilfs_sc_info *sci,
401 struct nilfs_segsum_pointer *ssp,
402 unsigned int bytes)
403{
404 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
405 unsigned int blocksize = sci->sc_super->s_blocksize;
406 void *p;
407
408 if (unlikely(ssp->offset + bytes > blocksize)) {
409 ssp->offset = 0;
410 BUG_ON(NILFS_SEGBUF_BH_IS_LAST(ssp->bh,
411 &segbuf->sb_segsum_buffers));
412 ssp->bh = NILFS_SEGBUF_NEXT_BH(ssp->bh);
413 }
414 p = ssp->bh->b_data + ssp->offset;
415 ssp->offset += bytes;
416 return p;
417}
418
419/**
420 * nilfs_segctor_reset_segment_buffer - reset the current segment buffer
421 * @sci: nilfs_sc_info
422 */
423static int nilfs_segctor_reset_segment_buffer(struct nilfs_sc_info *sci)
424{
425 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
426 struct buffer_head *sumbh;
427 unsigned int sumbytes;
428 unsigned int flags = 0;
429 int err;
430
431 if (nilfs_doing_gc())
432 flags = NILFS_SS_GC;
433 err = nilfs_segbuf_reset(segbuf, flags, sci->sc_seg_ctime, sci->sc_cno);
434 if (unlikely(err))
435 return err;
436
437 sumbh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers);
438 sumbytes = segbuf->sb_sum.sumbytes;
439 sci->sc_finfo_ptr.bh = sumbh; sci->sc_finfo_ptr.offset = sumbytes;
440 sci->sc_binfo_ptr.bh = sumbh; sci->sc_binfo_ptr.offset = sumbytes;
441 sci->sc_blk_cnt = sci->sc_datablk_cnt = 0;
442 return 0;
443}
444
445static int nilfs_segctor_feed_segment(struct nilfs_sc_info *sci)
446{
447 sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
448 if (NILFS_SEGBUF_IS_LAST(sci->sc_curseg, &sci->sc_segbufs))
449 return -E2BIG; /*
450 * The current segment is filled up
451 * (internal code)
452 */
453 sci->sc_curseg = NILFS_NEXT_SEGBUF(sci->sc_curseg);
454 return nilfs_segctor_reset_segment_buffer(sci);
455}
456
457static int nilfs_segctor_add_super_root(struct nilfs_sc_info *sci)
458{
459 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
460 int err;
461
462 if (segbuf->sb_sum.nblocks >= segbuf->sb_rest_blocks) {
463 err = nilfs_segctor_feed_segment(sci);
464 if (err)
465 return err;
466 segbuf = sci->sc_curseg;
467 }
468 err = nilfs_segbuf_extend_payload(segbuf, &segbuf->sb_super_root);
469 if (likely(!err))
470 segbuf->sb_sum.flags |= NILFS_SS_SR;
471 return err;
472}
473
474/*
475 * Functions for making segment summary and payloads
476 */
477static int nilfs_segctor_segsum_block_required(
478 struct nilfs_sc_info *sci, const struct nilfs_segsum_pointer *ssp,
479 unsigned int binfo_size)
480{
481 unsigned int blocksize = sci->sc_super->s_blocksize;
482 /* Size of finfo and binfo is enough small against blocksize */
483
484 return ssp->offset + binfo_size +
485 (!sci->sc_blk_cnt ? sizeof(struct nilfs_finfo) : 0) >
486 blocksize;
487}
488
489static void nilfs_segctor_begin_finfo(struct nilfs_sc_info *sci,
490 struct inode *inode)
491{
492 sci->sc_curseg->sb_sum.nfinfo++;
493 sci->sc_binfo_ptr = sci->sc_finfo_ptr;
494 nilfs_segctor_map_segsum_entry(
495 sci, &sci->sc_binfo_ptr, sizeof(struct nilfs_finfo));
496
497 if (NILFS_I(inode)->i_root &&
498 !test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags))
499 set_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
500 /* skip finfo */
501}
502
503static void nilfs_segctor_end_finfo(struct nilfs_sc_info *sci,
504 struct inode *inode)
505{
506 struct nilfs_finfo *finfo;
507 struct nilfs_inode_info *ii;
508 struct nilfs_segment_buffer *segbuf;
509 __u64 cno;
510
511 if (sci->sc_blk_cnt == 0)
512 return;
513
514 ii = NILFS_I(inode);
515
516 if (test_bit(NILFS_I_GCINODE, &ii->i_state))
517 cno = ii->i_cno;
518 else if (NILFS_ROOT_METADATA_FILE(inode->i_ino))
519 cno = 0;
520 else
521 cno = sci->sc_cno;
522
523 finfo = nilfs_segctor_map_segsum_entry(sci, &sci->sc_finfo_ptr,
524 sizeof(*finfo));
525 finfo->fi_ino = cpu_to_le64(inode->i_ino);
526 finfo->fi_nblocks = cpu_to_le32(sci->sc_blk_cnt);
527 finfo->fi_ndatablk = cpu_to_le32(sci->sc_datablk_cnt);
528 finfo->fi_cno = cpu_to_le64(cno);
529
530 segbuf = sci->sc_curseg;
531 segbuf->sb_sum.sumbytes = sci->sc_binfo_ptr.offset +
532 sci->sc_super->s_blocksize * (segbuf->sb_sum.nsumblk - 1);
533 sci->sc_finfo_ptr = sci->sc_binfo_ptr;
534 sci->sc_blk_cnt = sci->sc_datablk_cnt = 0;
535}
536
537static int nilfs_segctor_add_file_block(struct nilfs_sc_info *sci,
538 struct buffer_head *bh,
539 struct inode *inode,
540 unsigned int binfo_size)
541{
542 struct nilfs_segment_buffer *segbuf;
543 int required, err = 0;
544
545 retry:
546 segbuf = sci->sc_curseg;
547 required = nilfs_segctor_segsum_block_required(
548 sci, &sci->sc_binfo_ptr, binfo_size);
549 if (segbuf->sb_sum.nblocks + required + 1 > segbuf->sb_rest_blocks) {
550 nilfs_segctor_end_finfo(sci, inode);
551 err = nilfs_segctor_feed_segment(sci);
552 if (err)
553 return err;
554 goto retry;
555 }
556 if (unlikely(required)) {
557 err = nilfs_segbuf_extend_segsum(segbuf);
558 if (unlikely(err))
559 goto failed;
560 }
561 if (sci->sc_blk_cnt == 0)
562 nilfs_segctor_begin_finfo(sci, inode);
563
564 nilfs_segctor_map_segsum_entry(sci, &sci->sc_binfo_ptr, binfo_size);
565 /* Substitution to vblocknr is delayed until update_blocknr() */
566 nilfs_segbuf_add_file_buffer(segbuf, bh);
567 sci->sc_blk_cnt++;
568 failed:
569 return err;
570}
571
572/*
573 * Callback functions that enumerate, mark, and collect dirty blocks
574 */
575static int nilfs_collect_file_data(struct nilfs_sc_info *sci,
576 struct buffer_head *bh, struct inode *inode)
577{
578 int err;
579
580 err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
581 if (err < 0)
582 return err;
583
584 err = nilfs_segctor_add_file_block(sci, bh, inode,
585 sizeof(struct nilfs_binfo_v));
586 if (!err)
587 sci->sc_datablk_cnt++;
588 return err;
589}
590
591static int nilfs_collect_file_node(struct nilfs_sc_info *sci,
592 struct buffer_head *bh,
593 struct inode *inode)
594{
595 return nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
596}
597
598static int nilfs_collect_file_bmap(struct nilfs_sc_info *sci,
599 struct buffer_head *bh,
600 struct inode *inode)
601{
602 WARN_ON(!buffer_dirty(bh));
603 return nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
604}
605
606static void nilfs_write_file_data_binfo(struct nilfs_sc_info *sci,
607 struct nilfs_segsum_pointer *ssp,
608 union nilfs_binfo *binfo)
609{
610 struct nilfs_binfo_v *binfo_v = nilfs_segctor_map_segsum_entry(
611 sci, ssp, sizeof(*binfo_v));
612 *binfo_v = binfo->bi_v;
613}
614
615static void nilfs_write_file_node_binfo(struct nilfs_sc_info *sci,
616 struct nilfs_segsum_pointer *ssp,
617 union nilfs_binfo *binfo)
618{
619 __le64 *vblocknr = nilfs_segctor_map_segsum_entry(
620 sci, ssp, sizeof(*vblocknr));
621 *vblocknr = binfo->bi_v.bi_vblocknr;
622}
623
624static const struct nilfs_sc_operations nilfs_sc_file_ops = {
625 .collect_data = nilfs_collect_file_data,
626 .collect_node = nilfs_collect_file_node,
627 .collect_bmap = nilfs_collect_file_bmap,
628 .write_data_binfo = nilfs_write_file_data_binfo,
629 .write_node_binfo = nilfs_write_file_node_binfo,
630};
631
632static int nilfs_collect_dat_data(struct nilfs_sc_info *sci,
633 struct buffer_head *bh, struct inode *inode)
634{
635 int err;
636
637 err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
638 if (err < 0)
639 return err;
640
641 err = nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
642 if (!err)
643 sci->sc_datablk_cnt++;
644 return err;
645}
646
647static int nilfs_collect_dat_bmap(struct nilfs_sc_info *sci,
648 struct buffer_head *bh, struct inode *inode)
649{
650 WARN_ON(!buffer_dirty(bh));
651 return nilfs_segctor_add_file_block(sci, bh, inode,
652 sizeof(struct nilfs_binfo_dat));
653}
654
655static void nilfs_write_dat_data_binfo(struct nilfs_sc_info *sci,
656 struct nilfs_segsum_pointer *ssp,
657 union nilfs_binfo *binfo)
658{
659 __le64 *blkoff = nilfs_segctor_map_segsum_entry(sci, ssp,
660 sizeof(*blkoff));
661 *blkoff = binfo->bi_dat.bi_blkoff;
662}
663
664static void nilfs_write_dat_node_binfo(struct nilfs_sc_info *sci,
665 struct nilfs_segsum_pointer *ssp,
666 union nilfs_binfo *binfo)
667{
668 struct nilfs_binfo_dat *binfo_dat =
669 nilfs_segctor_map_segsum_entry(sci, ssp, sizeof(*binfo_dat));
670 *binfo_dat = binfo->bi_dat;
671}
672
673static const struct nilfs_sc_operations nilfs_sc_dat_ops = {
674 .collect_data = nilfs_collect_dat_data,
675 .collect_node = nilfs_collect_file_node,
676 .collect_bmap = nilfs_collect_dat_bmap,
677 .write_data_binfo = nilfs_write_dat_data_binfo,
678 .write_node_binfo = nilfs_write_dat_node_binfo,
679};
680
681static const struct nilfs_sc_operations nilfs_sc_dsync_ops = {
682 .collect_data = nilfs_collect_file_data,
683 .collect_node = NULL,
684 .collect_bmap = NULL,
685 .write_data_binfo = nilfs_write_file_data_binfo,
686 .write_node_binfo = NULL,
687};
688
689static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode,
690 struct list_head *listp,
691 size_t nlimit,
692 loff_t start, loff_t end)
693{
694 struct address_space *mapping = inode->i_mapping;
695 struct pagevec pvec;
696 pgoff_t index = 0, last = ULONG_MAX;
697 size_t ndirties = 0;
698 int i;
699
700 if (unlikely(start != 0 || end != LLONG_MAX)) {
701 /*
702 * A valid range is given for sync-ing data pages. The
703 * range is rounded to per-page; extra dirty buffers
704 * may be included if blocksize < pagesize.
705 */
706 index = start >> PAGE_SHIFT;
707 last = end >> PAGE_SHIFT;
708 }
709 pagevec_init(&pvec, 0);
710 repeat:
711 if (unlikely(index > last) ||
712 !pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY,
713 min_t(pgoff_t, last - index,
714 PAGEVEC_SIZE - 1) + 1))
715 return ndirties;
716
717 for (i = 0; i < pagevec_count(&pvec); i++) {
718 struct buffer_head *bh, *head;
719 struct page *page = pvec.pages[i];
720
721 if (unlikely(page->index > last))
722 break;
723
724 lock_page(page);
725 if (!page_has_buffers(page))
726 create_empty_buffers(page, 1 << inode->i_blkbits, 0);
727 unlock_page(page);
728
729 bh = head = page_buffers(page);
730 do {
731 if (!buffer_dirty(bh) || buffer_async_write(bh))
732 continue;
733 get_bh(bh);
734 list_add_tail(&bh->b_assoc_buffers, listp);
735 ndirties++;
736 if (unlikely(ndirties >= nlimit)) {
737 pagevec_release(&pvec);
738 cond_resched();
739 return ndirties;
740 }
741 } while (bh = bh->b_this_page, bh != head);
742 }
743 pagevec_release(&pvec);
744 cond_resched();
745 goto repeat;
746}
747
748static void nilfs_lookup_dirty_node_buffers(struct inode *inode,
749 struct list_head *listp)
750{
751 struct nilfs_inode_info *ii = NILFS_I(inode);
752 struct address_space *mapping = &ii->i_btnode_cache;
753 struct pagevec pvec;
754 struct buffer_head *bh, *head;
755 unsigned int i;
756 pgoff_t index = 0;
757
758 pagevec_init(&pvec, 0);
759
760 while (pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY,
761 PAGEVEC_SIZE)) {
762 for (i = 0; i < pagevec_count(&pvec); i++) {
763 bh = head = page_buffers(pvec.pages[i]);
764 do {
765 if (buffer_dirty(bh) &&
766 !buffer_async_write(bh)) {
767 get_bh(bh);
768 list_add_tail(&bh->b_assoc_buffers,
769 listp);
770 }
771 bh = bh->b_this_page;
772 } while (bh != head);
773 }
774 pagevec_release(&pvec);
775 cond_resched();
776 }
777}
778
779static void nilfs_dispose_list(struct the_nilfs *nilfs,
780 struct list_head *head, int force)
781{
782 struct nilfs_inode_info *ii, *n;
783 struct nilfs_inode_info *ivec[SC_N_INODEVEC], **pii;
784 unsigned int nv = 0;
785
786 while (!list_empty(head)) {
787 spin_lock(&nilfs->ns_inode_lock);
788 list_for_each_entry_safe(ii, n, head, i_dirty) {
789 list_del_init(&ii->i_dirty);
790 if (force) {
791 if (unlikely(ii->i_bh)) {
792 brelse(ii->i_bh);
793 ii->i_bh = NULL;
794 }
795 } else if (test_bit(NILFS_I_DIRTY, &ii->i_state)) {
796 set_bit(NILFS_I_QUEUED, &ii->i_state);
797 list_add_tail(&ii->i_dirty,
798 &nilfs->ns_dirty_files);
799 continue;
800 }
801 ivec[nv++] = ii;
802 if (nv == SC_N_INODEVEC)
803 break;
804 }
805 spin_unlock(&nilfs->ns_inode_lock);
806
807 for (pii = ivec; nv > 0; pii++, nv--)
808 iput(&(*pii)->vfs_inode);
809 }
810}
811
812static void nilfs_iput_work_func(struct work_struct *work)
813{
814 struct nilfs_sc_info *sci = container_of(work, struct nilfs_sc_info,
815 sc_iput_work);
816 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
817
818 nilfs_dispose_list(nilfs, &sci->sc_iput_queue, 0);
819}
820
821static int nilfs_test_metadata_dirty(struct the_nilfs *nilfs,
822 struct nilfs_root *root)
823{
824 int ret = 0;
825
826 if (nilfs_mdt_fetch_dirty(root->ifile))
827 ret++;
828 if (nilfs_mdt_fetch_dirty(nilfs->ns_cpfile))
829 ret++;
830 if (nilfs_mdt_fetch_dirty(nilfs->ns_sufile))
831 ret++;
832 if ((ret || nilfs_doing_gc()) && nilfs_mdt_fetch_dirty(nilfs->ns_dat))
833 ret++;
834 return ret;
835}
836
837static int nilfs_segctor_clean(struct nilfs_sc_info *sci)
838{
839 return list_empty(&sci->sc_dirty_files) &&
840 !test_bit(NILFS_SC_DIRTY, &sci->sc_flags) &&
841 sci->sc_nfreesegs == 0 &&
842 (!nilfs_doing_gc() || list_empty(&sci->sc_gc_inodes));
843}
844
845static int nilfs_segctor_confirm(struct nilfs_sc_info *sci)
846{
847 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
848 int ret = 0;
849
850 if (nilfs_test_metadata_dirty(nilfs, sci->sc_root))
851 set_bit(NILFS_SC_DIRTY, &sci->sc_flags);
852
853 spin_lock(&nilfs->ns_inode_lock);
854 if (list_empty(&nilfs->ns_dirty_files) && nilfs_segctor_clean(sci))
855 ret++;
856
857 spin_unlock(&nilfs->ns_inode_lock);
858 return ret;
859}
860
861static void nilfs_segctor_clear_metadata_dirty(struct nilfs_sc_info *sci)
862{
863 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
864
865 nilfs_mdt_clear_dirty(sci->sc_root->ifile);
866 nilfs_mdt_clear_dirty(nilfs->ns_cpfile);
867 nilfs_mdt_clear_dirty(nilfs->ns_sufile);
868 nilfs_mdt_clear_dirty(nilfs->ns_dat);
869}
870
871static int nilfs_segctor_create_checkpoint(struct nilfs_sc_info *sci)
872{
873 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
874 struct buffer_head *bh_cp;
875 struct nilfs_checkpoint *raw_cp;
876 int err;
877
878 /* XXX: this interface will be changed */
879 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 1,
880 &raw_cp, &bh_cp);
881 if (likely(!err)) {
882 /*
883 * The following code is duplicated with cpfile. But, it is
884 * needed to collect the checkpoint even if it was not newly
885 * created.
886 */
887 mark_buffer_dirty(bh_cp);
888 nilfs_mdt_mark_dirty(nilfs->ns_cpfile);
889 nilfs_cpfile_put_checkpoint(
890 nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
891 } else
892 WARN_ON(err == -EINVAL || err == -ENOENT);
893
894 return err;
895}
896
897static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci)
898{
899 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
900 struct buffer_head *bh_cp;
901 struct nilfs_checkpoint *raw_cp;
902 int err;
903
904 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 0,
905 &raw_cp, &bh_cp);
906 if (unlikely(err)) {
907 WARN_ON(err == -EINVAL || err == -ENOENT);
908 goto failed_ibh;
909 }
910 raw_cp->cp_snapshot_list.ssl_next = 0;
911 raw_cp->cp_snapshot_list.ssl_prev = 0;
912 raw_cp->cp_inodes_count =
913 cpu_to_le64(atomic64_read(&sci->sc_root->inodes_count));
914 raw_cp->cp_blocks_count =
915 cpu_to_le64(atomic64_read(&sci->sc_root->blocks_count));
916 raw_cp->cp_nblk_inc =
917 cpu_to_le64(sci->sc_nblk_inc + sci->sc_nblk_this_inc);
918 raw_cp->cp_create = cpu_to_le64(sci->sc_seg_ctime);
919 raw_cp->cp_cno = cpu_to_le64(nilfs->ns_cno);
920
921 if (test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags))
922 nilfs_checkpoint_clear_minor(raw_cp);
923 else
924 nilfs_checkpoint_set_minor(raw_cp);
925
926 nilfs_write_inode_common(sci->sc_root->ifile,
927 &raw_cp->cp_ifile_inode, 1);
928 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
929 return 0;
930
931 failed_ibh:
932 return err;
933}
934
935static void nilfs_fill_in_file_bmap(struct inode *ifile,
936 struct nilfs_inode_info *ii)
937
938{
939 struct buffer_head *ibh;
940 struct nilfs_inode *raw_inode;
941
942 if (test_bit(NILFS_I_BMAP, &ii->i_state)) {
943 ibh = ii->i_bh;
944 BUG_ON(!ibh);
945 raw_inode = nilfs_ifile_map_inode(ifile, ii->vfs_inode.i_ino,
946 ibh);
947 nilfs_bmap_write(ii->i_bmap, raw_inode);
948 nilfs_ifile_unmap_inode(ifile, ii->vfs_inode.i_ino, ibh);
949 }
950}
951
952static void nilfs_segctor_fill_in_file_bmap(struct nilfs_sc_info *sci)
953{
954 struct nilfs_inode_info *ii;
955
956 list_for_each_entry(ii, &sci->sc_dirty_files, i_dirty) {
957 nilfs_fill_in_file_bmap(sci->sc_root->ifile, ii);
958 set_bit(NILFS_I_COLLECTED, &ii->i_state);
959 }
960}
961
962static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info *sci,
963 struct the_nilfs *nilfs)
964{
965 struct buffer_head *bh_sr;
966 struct nilfs_super_root *raw_sr;
967 unsigned int isz, srsz;
968
969 bh_sr = NILFS_LAST_SEGBUF(&sci->sc_segbufs)->sb_super_root;
970 raw_sr = (struct nilfs_super_root *)bh_sr->b_data;
971 isz = nilfs->ns_inode_size;
972 srsz = NILFS_SR_BYTES(isz);
973
974 raw_sr->sr_bytes = cpu_to_le16(srsz);
975 raw_sr->sr_nongc_ctime
976 = cpu_to_le64(nilfs_doing_gc() ?
977 nilfs->ns_nongc_ctime : sci->sc_seg_ctime);
978 raw_sr->sr_flags = 0;
979
980 nilfs_write_inode_common(nilfs->ns_dat, (void *)raw_sr +
981 NILFS_SR_DAT_OFFSET(isz), 1);
982 nilfs_write_inode_common(nilfs->ns_cpfile, (void *)raw_sr +
983 NILFS_SR_CPFILE_OFFSET(isz), 1);
984 nilfs_write_inode_common(nilfs->ns_sufile, (void *)raw_sr +
985 NILFS_SR_SUFILE_OFFSET(isz), 1);
986 memset((void *)raw_sr + srsz, 0, nilfs->ns_blocksize - srsz);
987}
988
989static void nilfs_redirty_inodes(struct list_head *head)
990{
991 struct nilfs_inode_info *ii;
992
993 list_for_each_entry(ii, head, i_dirty) {
994 if (test_bit(NILFS_I_COLLECTED, &ii->i_state))
995 clear_bit(NILFS_I_COLLECTED, &ii->i_state);
996 }
997}
998
999static void nilfs_drop_collected_inodes(struct list_head *head)
1000{
1001 struct nilfs_inode_info *ii;
1002
1003 list_for_each_entry(ii, head, i_dirty) {
1004 if (!test_and_clear_bit(NILFS_I_COLLECTED, &ii->i_state))
1005 continue;
1006
1007 clear_bit(NILFS_I_INODE_SYNC, &ii->i_state);
1008 set_bit(NILFS_I_UPDATED, &ii->i_state);
1009 }
1010}
1011
1012static int nilfs_segctor_apply_buffers(struct nilfs_sc_info *sci,
1013 struct inode *inode,
1014 struct list_head *listp,
1015 int (*collect)(struct nilfs_sc_info *,
1016 struct buffer_head *,
1017 struct inode *))
1018{
1019 struct buffer_head *bh, *n;
1020 int err = 0;
1021
1022 if (collect) {
1023 list_for_each_entry_safe(bh, n, listp, b_assoc_buffers) {
1024 list_del_init(&bh->b_assoc_buffers);
1025 err = collect(sci, bh, inode);
1026 brelse(bh);
1027 if (unlikely(err))
1028 goto dispose_buffers;
1029 }
1030 return 0;
1031 }
1032
1033 dispose_buffers:
1034 while (!list_empty(listp)) {
1035 bh = list_first_entry(listp, struct buffer_head,
1036 b_assoc_buffers);
1037 list_del_init(&bh->b_assoc_buffers);
1038 brelse(bh);
1039 }
1040 return err;
1041}
1042
1043static size_t nilfs_segctor_buffer_rest(struct nilfs_sc_info *sci)
1044{
1045 /* Remaining number of blocks within segment buffer */
1046 return sci->sc_segbuf_nblocks -
1047 (sci->sc_nblk_this_inc + sci->sc_curseg->sb_sum.nblocks);
1048}
1049
1050static int nilfs_segctor_scan_file(struct nilfs_sc_info *sci,
1051 struct inode *inode,
1052 const struct nilfs_sc_operations *sc_ops)
1053{
1054 LIST_HEAD(data_buffers);
1055 LIST_HEAD(node_buffers);
1056 int err;
1057
1058 if (!(sci->sc_stage.flags & NILFS_CF_NODE)) {
1059 size_t n, rest = nilfs_segctor_buffer_rest(sci);
1060
1061 n = nilfs_lookup_dirty_data_buffers(
1062 inode, &data_buffers, rest + 1, 0, LLONG_MAX);
1063 if (n > rest) {
1064 err = nilfs_segctor_apply_buffers(
1065 sci, inode, &data_buffers,
1066 sc_ops->collect_data);
1067 BUG_ON(!err); /* always receive -E2BIG or true error */
1068 goto break_or_fail;
1069 }
1070 }
1071 nilfs_lookup_dirty_node_buffers(inode, &node_buffers);
1072
1073 if (!(sci->sc_stage.flags & NILFS_CF_NODE)) {
1074 err = nilfs_segctor_apply_buffers(
1075 sci, inode, &data_buffers, sc_ops->collect_data);
1076 if (unlikely(err)) {
1077 /* dispose node list */
1078 nilfs_segctor_apply_buffers(
1079 sci, inode, &node_buffers, NULL);
1080 goto break_or_fail;
1081 }
1082 sci->sc_stage.flags |= NILFS_CF_NODE;
1083 }
1084 /* Collect node */
1085 err = nilfs_segctor_apply_buffers(
1086 sci, inode, &node_buffers, sc_ops->collect_node);
1087 if (unlikely(err))
1088 goto break_or_fail;
1089
1090 nilfs_bmap_lookup_dirty_buffers(NILFS_I(inode)->i_bmap, &node_buffers);
1091 err = nilfs_segctor_apply_buffers(
1092 sci, inode, &node_buffers, sc_ops->collect_bmap);
1093 if (unlikely(err))
1094 goto break_or_fail;
1095
1096 nilfs_segctor_end_finfo(sci, inode);
1097 sci->sc_stage.flags &= ~NILFS_CF_NODE;
1098
1099 break_or_fail:
1100 return err;
1101}
1102
1103static int nilfs_segctor_scan_file_dsync(struct nilfs_sc_info *sci,
1104 struct inode *inode)
1105{
1106 LIST_HEAD(data_buffers);
1107 size_t n, rest = nilfs_segctor_buffer_rest(sci);
1108 int err;
1109
1110 n = nilfs_lookup_dirty_data_buffers(inode, &data_buffers, rest + 1,
1111 sci->sc_dsync_start,
1112 sci->sc_dsync_end);
1113
1114 err = nilfs_segctor_apply_buffers(sci, inode, &data_buffers,
1115 nilfs_collect_file_data);
1116 if (!err) {
1117 nilfs_segctor_end_finfo(sci, inode);
1118 BUG_ON(n > rest);
1119 /* always receive -E2BIG or true error if n > rest */
1120 }
1121 return err;
1122}
1123
1124static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode)
1125{
1126 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
1127 struct list_head *head;
1128 struct nilfs_inode_info *ii;
1129 size_t ndone;
1130 int err = 0;
1131
1132 switch (nilfs_sc_cstage_get(sci)) {
1133 case NILFS_ST_INIT:
1134 /* Pre-processes */
1135 sci->sc_stage.flags = 0;
1136
1137 if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) {
1138 sci->sc_nblk_inc = 0;
1139 sci->sc_curseg->sb_sum.flags = NILFS_SS_LOGBGN;
1140 if (mode == SC_LSEG_DSYNC) {
1141 nilfs_sc_cstage_set(sci, NILFS_ST_DSYNC);
1142 goto dsync_mode;
1143 }
1144 }
1145
1146 sci->sc_stage.dirty_file_ptr = NULL;
1147 sci->sc_stage.gc_inode_ptr = NULL;
1148 if (mode == SC_FLUSH_DAT) {
1149 nilfs_sc_cstage_set(sci, NILFS_ST_DAT);
1150 goto dat_stage;
1151 }
1152 nilfs_sc_cstage_inc(sci); /* Fall through */
1153 case NILFS_ST_GC:
1154 if (nilfs_doing_gc()) {
1155 head = &sci->sc_gc_inodes;
1156 ii = list_prepare_entry(sci->sc_stage.gc_inode_ptr,
1157 head, i_dirty);
1158 list_for_each_entry_continue(ii, head, i_dirty) {
1159 err = nilfs_segctor_scan_file(
1160 sci, &ii->vfs_inode,
1161 &nilfs_sc_file_ops);
1162 if (unlikely(err)) {
1163 sci->sc_stage.gc_inode_ptr = list_entry(
1164 ii->i_dirty.prev,
1165 struct nilfs_inode_info,
1166 i_dirty);
1167 goto break_or_fail;
1168 }
1169 set_bit(NILFS_I_COLLECTED, &ii->i_state);
1170 }
1171 sci->sc_stage.gc_inode_ptr = NULL;
1172 }
1173 nilfs_sc_cstage_inc(sci); /* Fall through */
1174 case NILFS_ST_FILE:
1175 head = &sci->sc_dirty_files;
1176 ii = list_prepare_entry(sci->sc_stage.dirty_file_ptr, head,
1177 i_dirty);
1178 list_for_each_entry_continue(ii, head, i_dirty) {
1179 clear_bit(NILFS_I_DIRTY, &ii->i_state);
1180
1181 err = nilfs_segctor_scan_file(sci, &ii->vfs_inode,
1182 &nilfs_sc_file_ops);
1183 if (unlikely(err)) {
1184 sci->sc_stage.dirty_file_ptr =
1185 list_entry(ii->i_dirty.prev,
1186 struct nilfs_inode_info,
1187 i_dirty);
1188 goto break_or_fail;
1189 }
1190 /* sci->sc_stage.dirty_file_ptr = NILFS_I(inode); */
1191 /* XXX: required ? */
1192 }
1193 sci->sc_stage.dirty_file_ptr = NULL;
1194 if (mode == SC_FLUSH_FILE) {
1195 nilfs_sc_cstage_set(sci, NILFS_ST_DONE);
1196 return 0;
1197 }
1198 nilfs_sc_cstage_inc(sci);
1199 sci->sc_stage.flags |= NILFS_CF_IFILE_STARTED;
1200 /* Fall through */
1201 case NILFS_ST_IFILE:
1202 err = nilfs_segctor_scan_file(sci, sci->sc_root->ifile,
1203 &nilfs_sc_file_ops);
1204 if (unlikely(err))
1205 break;
1206 nilfs_sc_cstage_inc(sci);
1207 /* Creating a checkpoint */
1208 err = nilfs_segctor_create_checkpoint(sci);
1209 if (unlikely(err))
1210 break;
1211 /* Fall through */
1212 case NILFS_ST_CPFILE:
1213 err = nilfs_segctor_scan_file(sci, nilfs->ns_cpfile,
1214 &nilfs_sc_file_ops);
1215 if (unlikely(err))
1216 break;
1217 nilfs_sc_cstage_inc(sci); /* Fall through */
1218 case NILFS_ST_SUFILE:
1219 err = nilfs_sufile_freev(nilfs->ns_sufile, sci->sc_freesegs,
1220 sci->sc_nfreesegs, &ndone);
1221 if (unlikely(err)) {
1222 nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1223 sci->sc_freesegs, ndone,
1224 NULL);
1225 break;
1226 }
1227 sci->sc_stage.flags |= NILFS_CF_SUFREED;
1228
1229 err = nilfs_segctor_scan_file(sci, nilfs->ns_sufile,
1230 &nilfs_sc_file_ops);
1231 if (unlikely(err))
1232 break;
1233 nilfs_sc_cstage_inc(sci); /* Fall through */
1234 case NILFS_ST_DAT:
1235 dat_stage:
1236 err = nilfs_segctor_scan_file(sci, nilfs->ns_dat,
1237 &nilfs_sc_dat_ops);
1238 if (unlikely(err))
1239 break;
1240 if (mode == SC_FLUSH_DAT) {
1241 nilfs_sc_cstage_set(sci, NILFS_ST_DONE);
1242 return 0;
1243 }
1244 nilfs_sc_cstage_inc(sci); /* Fall through */
1245 case NILFS_ST_SR:
1246 if (mode == SC_LSEG_SR) {
1247 /* Appending a super root */
1248 err = nilfs_segctor_add_super_root(sci);
1249 if (unlikely(err))
1250 break;
1251 }
1252 /* End of a logical segment */
1253 sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND;
1254 nilfs_sc_cstage_set(sci, NILFS_ST_DONE);
1255 return 0;
1256 case NILFS_ST_DSYNC:
1257 dsync_mode:
1258 sci->sc_curseg->sb_sum.flags |= NILFS_SS_SYNDT;
1259 ii = sci->sc_dsync_inode;
1260 if (!test_bit(NILFS_I_BUSY, &ii->i_state))
1261 break;
1262
1263 err = nilfs_segctor_scan_file_dsync(sci, &ii->vfs_inode);
1264 if (unlikely(err))
1265 break;
1266 sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND;
1267 nilfs_sc_cstage_set(sci, NILFS_ST_DONE);
1268 return 0;
1269 case NILFS_ST_DONE:
1270 return 0;
1271 default:
1272 BUG();
1273 }
1274
1275 break_or_fail:
1276 return err;
1277}
1278
1279/**
1280 * nilfs_segctor_begin_construction - setup segment buffer to make a new log
1281 * @sci: nilfs_sc_info
1282 * @nilfs: nilfs object
1283 */
1284static int nilfs_segctor_begin_construction(struct nilfs_sc_info *sci,
1285 struct the_nilfs *nilfs)
1286{
1287 struct nilfs_segment_buffer *segbuf, *prev;
1288 __u64 nextnum;
1289 int err, alloc = 0;
1290
1291 segbuf = nilfs_segbuf_new(sci->sc_super);
1292 if (unlikely(!segbuf))
1293 return -ENOMEM;
1294
1295 if (list_empty(&sci->sc_write_logs)) {
1296 nilfs_segbuf_map(segbuf, nilfs->ns_segnum,
1297 nilfs->ns_pseg_offset, nilfs);
1298 if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
1299 nilfs_shift_to_next_segment(nilfs);
1300 nilfs_segbuf_map(segbuf, nilfs->ns_segnum, 0, nilfs);
1301 }
1302
1303 segbuf->sb_sum.seg_seq = nilfs->ns_seg_seq;
1304 nextnum = nilfs->ns_nextnum;
1305
1306 if (nilfs->ns_segnum == nilfs->ns_nextnum)
1307 /* Start from the head of a new full segment */
1308 alloc++;
1309 } else {
1310 /* Continue logs */
1311 prev = NILFS_LAST_SEGBUF(&sci->sc_write_logs);
1312 nilfs_segbuf_map_cont(segbuf, prev);
1313 segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq;
1314 nextnum = prev->sb_nextnum;
1315
1316 if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
1317 nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs);
1318 segbuf->sb_sum.seg_seq++;
1319 alloc++;
1320 }
1321 }
1322
1323 err = nilfs_sufile_mark_dirty(nilfs->ns_sufile, segbuf->sb_segnum);
1324 if (err)
1325 goto failed;
1326
1327 if (alloc) {
1328 err = nilfs_sufile_alloc(nilfs->ns_sufile, &nextnum);
1329 if (err)
1330 goto failed;
1331 }
1332 nilfs_segbuf_set_next_segnum(segbuf, nextnum, nilfs);
1333
1334 BUG_ON(!list_empty(&sci->sc_segbufs));
1335 list_add_tail(&segbuf->sb_list, &sci->sc_segbufs);
1336 sci->sc_segbuf_nblocks = segbuf->sb_rest_blocks;
1337 return 0;
1338
1339 failed:
1340 nilfs_segbuf_free(segbuf);
1341 return err;
1342}
1343
1344static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci,
1345 struct the_nilfs *nilfs, int nadd)
1346{
1347 struct nilfs_segment_buffer *segbuf, *prev;
1348 struct inode *sufile = nilfs->ns_sufile;
1349 __u64 nextnextnum;
1350 LIST_HEAD(list);
1351 int err, ret, i;
1352
1353 prev = NILFS_LAST_SEGBUF(&sci->sc_segbufs);
1354 /*
1355 * Since the segment specified with nextnum might be allocated during
1356 * the previous construction, the buffer including its segusage may
1357 * not be dirty. The following call ensures that the buffer is dirty
1358 * and will pin the buffer on memory until the sufile is written.
1359 */
1360 err = nilfs_sufile_mark_dirty(sufile, prev->sb_nextnum);
1361 if (unlikely(err))
1362 return err;
1363
1364 for (i = 0; i < nadd; i++) {
1365 /* extend segment info */
1366 err = -ENOMEM;
1367 segbuf = nilfs_segbuf_new(sci->sc_super);
1368 if (unlikely(!segbuf))
1369 goto failed;
1370
1371 /* map this buffer to region of segment on-disk */
1372 nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs);
1373 sci->sc_segbuf_nblocks += segbuf->sb_rest_blocks;
1374
1375 /* allocate the next next full segment */
1376 err = nilfs_sufile_alloc(sufile, &nextnextnum);
1377 if (unlikely(err))
1378 goto failed_segbuf;
1379
1380 segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq + 1;
1381 nilfs_segbuf_set_next_segnum(segbuf, nextnextnum, nilfs);
1382
1383 list_add_tail(&segbuf->sb_list, &list);
1384 prev = segbuf;
1385 }
1386 list_splice_tail(&list, &sci->sc_segbufs);
1387 return 0;
1388
1389 failed_segbuf:
1390 nilfs_segbuf_free(segbuf);
1391 failed:
1392 list_for_each_entry(segbuf, &list, sb_list) {
1393 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1394 WARN_ON(ret); /* never fails */
1395 }
1396 nilfs_destroy_logs(&list);
1397 return err;
1398}
1399
1400static void nilfs_free_incomplete_logs(struct list_head *logs,
1401 struct the_nilfs *nilfs)
1402{
1403 struct nilfs_segment_buffer *segbuf, *prev;
1404 struct inode *sufile = nilfs->ns_sufile;
1405 int ret;
1406
1407 segbuf = NILFS_FIRST_SEGBUF(logs);
1408 if (nilfs->ns_nextnum != segbuf->sb_nextnum) {
1409 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1410 WARN_ON(ret); /* never fails */
1411 }
1412 if (atomic_read(&segbuf->sb_err)) {
1413 /* Case 1: The first segment failed */
1414 if (segbuf->sb_pseg_start != segbuf->sb_fseg_start)
1415 /*
1416 * Case 1a: Partial segment appended into an existing
1417 * segment
1418 */
1419 nilfs_terminate_segment(nilfs, segbuf->sb_fseg_start,
1420 segbuf->sb_fseg_end);
1421 else /* Case 1b: New full segment */
1422 set_nilfs_discontinued(nilfs);
1423 }
1424
1425 prev = segbuf;
1426 list_for_each_entry_continue(segbuf, logs, sb_list) {
1427 if (prev->sb_nextnum != segbuf->sb_nextnum) {
1428 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1429 WARN_ON(ret); /* never fails */
1430 }
1431 if (atomic_read(&segbuf->sb_err) &&
1432 segbuf->sb_segnum != nilfs->ns_nextnum)
1433 /* Case 2: extended segment (!= next) failed */
1434 nilfs_sufile_set_error(sufile, segbuf->sb_segnum);
1435 prev = segbuf;
1436 }
1437}
1438
1439static void nilfs_segctor_update_segusage(struct nilfs_sc_info *sci,
1440 struct inode *sufile)
1441{
1442 struct nilfs_segment_buffer *segbuf;
1443 unsigned long live_blocks;
1444 int ret;
1445
1446 list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
1447 live_blocks = segbuf->sb_sum.nblocks +
1448 (segbuf->sb_pseg_start - segbuf->sb_fseg_start);
1449 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1450 live_blocks,
1451 sci->sc_seg_ctime);
1452 WARN_ON(ret); /* always succeed because the segusage is dirty */
1453 }
1454}
1455
1456static void nilfs_cancel_segusage(struct list_head *logs, struct inode *sufile)
1457{
1458 struct nilfs_segment_buffer *segbuf;
1459 int ret;
1460
1461 segbuf = NILFS_FIRST_SEGBUF(logs);
1462 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1463 segbuf->sb_pseg_start -
1464 segbuf->sb_fseg_start, 0);
1465 WARN_ON(ret); /* always succeed because the segusage is dirty */
1466
1467 list_for_each_entry_continue(segbuf, logs, sb_list) {
1468 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1469 0, 0);
1470 WARN_ON(ret); /* always succeed */
1471 }
1472}
1473
1474static void nilfs_segctor_truncate_segments(struct nilfs_sc_info *sci,
1475 struct nilfs_segment_buffer *last,
1476 struct inode *sufile)
1477{
1478 struct nilfs_segment_buffer *segbuf = last;
1479 int ret;
1480
1481 list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) {
1482 sci->sc_segbuf_nblocks -= segbuf->sb_rest_blocks;
1483 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1484 WARN_ON(ret);
1485 }
1486 nilfs_truncate_logs(&sci->sc_segbufs, last);
1487}
1488
1489
1490static int nilfs_segctor_collect(struct nilfs_sc_info *sci,
1491 struct the_nilfs *nilfs, int mode)
1492{
1493 struct nilfs_cstage prev_stage = sci->sc_stage;
1494 int err, nadd = 1;
1495
1496 /* Collection retry loop */
1497 for (;;) {
1498 sci->sc_nblk_this_inc = 0;
1499 sci->sc_curseg = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
1500
1501 err = nilfs_segctor_reset_segment_buffer(sci);
1502 if (unlikely(err))
1503 goto failed;
1504
1505 err = nilfs_segctor_collect_blocks(sci, mode);
1506 sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
1507 if (!err)
1508 break;
1509
1510 if (unlikely(err != -E2BIG))
1511 goto failed;
1512
1513 /* The current segment is filled up */
1514 if (mode != SC_LSEG_SR ||
1515 nilfs_sc_cstage_get(sci) < NILFS_ST_CPFILE)
1516 break;
1517
1518 nilfs_clear_logs(&sci->sc_segbufs);
1519
1520 if (sci->sc_stage.flags & NILFS_CF_SUFREED) {
1521 err = nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1522 sci->sc_freesegs,
1523 sci->sc_nfreesegs,
1524 NULL);
1525 WARN_ON(err); /* do not happen */
1526 sci->sc_stage.flags &= ~NILFS_CF_SUFREED;
1527 }
1528
1529 err = nilfs_segctor_extend_segments(sci, nilfs, nadd);
1530 if (unlikely(err))
1531 return err;
1532
1533 nadd = min_t(int, nadd << 1, SC_MAX_SEGDELTA);
1534 sci->sc_stage = prev_stage;
1535 }
1536 nilfs_segctor_truncate_segments(sci, sci->sc_curseg, nilfs->ns_sufile);
1537 return 0;
1538
1539 failed:
1540 return err;
1541}
1542
1543static void nilfs_list_replace_buffer(struct buffer_head *old_bh,
1544 struct buffer_head *new_bh)
1545{
1546 BUG_ON(!list_empty(&new_bh->b_assoc_buffers));
1547
1548 list_replace_init(&old_bh->b_assoc_buffers, &new_bh->b_assoc_buffers);
1549 /* The caller must release old_bh */
1550}
1551
1552static int
1553nilfs_segctor_update_payload_blocknr(struct nilfs_sc_info *sci,
1554 struct nilfs_segment_buffer *segbuf,
1555 int mode)
1556{
1557 struct inode *inode = NULL;
1558 sector_t blocknr;
1559 unsigned long nfinfo = segbuf->sb_sum.nfinfo;
1560 unsigned long nblocks = 0, ndatablk = 0;
1561 const struct nilfs_sc_operations *sc_op = NULL;
1562 struct nilfs_segsum_pointer ssp;
1563 struct nilfs_finfo *finfo = NULL;
1564 union nilfs_binfo binfo;
1565 struct buffer_head *bh, *bh_org;
1566 ino_t ino = 0;
1567 int err = 0;
1568
1569 if (!nfinfo)
1570 goto out;
1571
1572 blocknr = segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk;
1573 ssp.bh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers);
1574 ssp.offset = sizeof(struct nilfs_segment_summary);
1575
1576 list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
1577 if (bh == segbuf->sb_super_root)
1578 break;
1579 if (!finfo) {
1580 finfo = nilfs_segctor_map_segsum_entry(
1581 sci, &ssp, sizeof(*finfo));
1582 ino = le64_to_cpu(finfo->fi_ino);
1583 nblocks = le32_to_cpu(finfo->fi_nblocks);
1584 ndatablk = le32_to_cpu(finfo->fi_ndatablk);
1585
1586 inode = bh->b_page->mapping->host;
1587
1588 if (mode == SC_LSEG_DSYNC)
1589 sc_op = &nilfs_sc_dsync_ops;
1590 else if (ino == NILFS_DAT_INO)
1591 sc_op = &nilfs_sc_dat_ops;
1592 else /* file blocks */
1593 sc_op = &nilfs_sc_file_ops;
1594 }
1595 bh_org = bh;
1596 get_bh(bh_org);
1597 err = nilfs_bmap_assign(NILFS_I(inode)->i_bmap, &bh, blocknr,
1598 &binfo);
1599 if (bh != bh_org)
1600 nilfs_list_replace_buffer(bh_org, bh);
1601 brelse(bh_org);
1602 if (unlikely(err))
1603 goto failed_bmap;
1604
1605 if (ndatablk > 0)
1606 sc_op->write_data_binfo(sci, &ssp, &binfo);
1607 else
1608 sc_op->write_node_binfo(sci, &ssp, &binfo);
1609
1610 blocknr++;
1611 if (--nblocks == 0) {
1612 finfo = NULL;
1613 if (--nfinfo == 0)
1614 break;
1615 } else if (ndatablk > 0)
1616 ndatablk--;
1617 }
1618 out:
1619 return 0;
1620
1621 failed_bmap:
1622 return err;
1623}
1624
1625static int nilfs_segctor_assign(struct nilfs_sc_info *sci, int mode)
1626{
1627 struct nilfs_segment_buffer *segbuf;
1628 int err;
1629
1630 list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
1631 err = nilfs_segctor_update_payload_blocknr(sci, segbuf, mode);
1632 if (unlikely(err))
1633 return err;
1634 nilfs_segbuf_fill_in_segsum(segbuf);
1635 }
1636 return 0;
1637}
1638
1639static void nilfs_begin_page_io(struct page *page)
1640{
1641 if (!page || PageWriteback(page))
1642 /*
1643 * For split b-tree node pages, this function may be called
1644 * twice. We ignore the 2nd or later calls by this check.
1645 */
1646 return;
1647
1648 lock_page(page);
1649 clear_page_dirty_for_io(page);
1650 set_page_writeback(page);
1651 unlock_page(page);
1652}
1653
1654static void nilfs_segctor_prepare_write(struct nilfs_sc_info *sci)
1655{
1656 struct nilfs_segment_buffer *segbuf;
1657 struct page *bd_page = NULL, *fs_page = NULL;
1658
1659 list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
1660 struct buffer_head *bh;
1661
1662 list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
1663 b_assoc_buffers) {
1664 if (bh->b_page != bd_page) {
1665 if (bd_page) {
1666 lock_page(bd_page);
1667 clear_page_dirty_for_io(bd_page);
1668 set_page_writeback(bd_page);
1669 unlock_page(bd_page);
1670 }
1671 bd_page = bh->b_page;
1672 }
1673 }
1674
1675 list_for_each_entry(bh, &segbuf->sb_payload_buffers,
1676 b_assoc_buffers) {
1677 set_buffer_async_write(bh);
1678 if (bh == segbuf->sb_super_root) {
1679 if (bh->b_page != bd_page) {
1680 lock_page(bd_page);
1681 clear_page_dirty_for_io(bd_page);
1682 set_page_writeback(bd_page);
1683 unlock_page(bd_page);
1684 bd_page = bh->b_page;
1685 }
1686 break;
1687 }
1688 if (bh->b_page != fs_page) {
1689 nilfs_begin_page_io(fs_page);
1690 fs_page = bh->b_page;
1691 }
1692 }
1693 }
1694 if (bd_page) {
1695 lock_page(bd_page);
1696 clear_page_dirty_for_io(bd_page);
1697 set_page_writeback(bd_page);
1698 unlock_page(bd_page);
1699 }
1700 nilfs_begin_page_io(fs_page);
1701}
1702
1703static int nilfs_segctor_write(struct nilfs_sc_info *sci,
1704 struct the_nilfs *nilfs)
1705{
1706 int ret;
1707
1708 ret = nilfs_write_logs(&sci->sc_segbufs, nilfs);
1709 list_splice_tail_init(&sci->sc_segbufs, &sci->sc_write_logs);
1710 return ret;
1711}
1712
1713static void nilfs_end_page_io(struct page *page, int err)
1714{
1715 if (!page)
1716 return;
1717
1718 if (buffer_nilfs_node(page_buffers(page)) && !PageWriteback(page)) {
1719 /*
1720 * For b-tree node pages, this function may be called twice
1721 * or more because they might be split in a segment.
1722 */
1723 if (PageDirty(page)) {
1724 /*
1725 * For pages holding split b-tree node buffers, dirty
1726 * flag on the buffers may be cleared discretely.
1727 * In that case, the page is once redirtied for
1728 * remaining buffers, and it must be cancelled if
1729 * all the buffers get cleaned later.
1730 */
1731 lock_page(page);
1732 if (nilfs_page_buffers_clean(page))
1733 __nilfs_clear_page_dirty(page);
1734 unlock_page(page);
1735 }
1736 return;
1737 }
1738
1739 if (!err) {
1740 if (!nilfs_page_buffers_clean(page))
1741 __set_page_dirty_nobuffers(page);
1742 ClearPageError(page);
1743 } else {
1744 __set_page_dirty_nobuffers(page);
1745 SetPageError(page);
1746 }
1747
1748 end_page_writeback(page);
1749}
1750
1751static void nilfs_abort_logs(struct list_head *logs, int err)
1752{
1753 struct nilfs_segment_buffer *segbuf;
1754 struct page *bd_page = NULL, *fs_page = NULL;
1755 struct buffer_head *bh;
1756
1757 if (list_empty(logs))
1758 return;
1759
1760 list_for_each_entry(segbuf, logs, sb_list) {
1761 list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
1762 b_assoc_buffers) {
1763 if (bh->b_page != bd_page) {
1764 if (bd_page)
1765 end_page_writeback(bd_page);
1766 bd_page = bh->b_page;
1767 }
1768 }
1769
1770 list_for_each_entry(bh, &segbuf->sb_payload_buffers,
1771 b_assoc_buffers) {
1772 clear_buffer_async_write(bh);
1773 if (bh == segbuf->sb_super_root) {
1774 if (bh->b_page != bd_page) {
1775 end_page_writeback(bd_page);
1776 bd_page = bh->b_page;
1777 }
1778 break;
1779 }
1780 if (bh->b_page != fs_page) {
1781 nilfs_end_page_io(fs_page, err);
1782 fs_page = bh->b_page;
1783 }
1784 }
1785 }
1786 if (bd_page)
1787 end_page_writeback(bd_page);
1788
1789 nilfs_end_page_io(fs_page, err);
1790}
1791
1792static void nilfs_segctor_abort_construction(struct nilfs_sc_info *sci,
1793 struct the_nilfs *nilfs, int err)
1794{
1795 LIST_HEAD(logs);
1796 int ret;
1797
1798 list_splice_tail_init(&sci->sc_write_logs, &logs);
1799 ret = nilfs_wait_on_logs(&logs);
1800 nilfs_abort_logs(&logs, ret ? : err);
1801
1802 list_splice_tail_init(&sci->sc_segbufs, &logs);
1803 nilfs_cancel_segusage(&logs, nilfs->ns_sufile);
1804 nilfs_free_incomplete_logs(&logs, nilfs);
1805
1806 if (sci->sc_stage.flags & NILFS_CF_SUFREED) {
1807 ret = nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1808 sci->sc_freesegs,
1809 sci->sc_nfreesegs,
1810 NULL);
1811 WARN_ON(ret); /* do not happen */
1812 }
1813
1814 nilfs_destroy_logs(&logs);
1815}
1816
1817static void nilfs_set_next_segment(struct the_nilfs *nilfs,
1818 struct nilfs_segment_buffer *segbuf)
1819{
1820 nilfs->ns_segnum = segbuf->sb_segnum;
1821 nilfs->ns_nextnum = segbuf->sb_nextnum;
1822 nilfs->ns_pseg_offset = segbuf->sb_pseg_start - segbuf->sb_fseg_start
1823 + segbuf->sb_sum.nblocks;
1824 nilfs->ns_seg_seq = segbuf->sb_sum.seg_seq;
1825 nilfs->ns_ctime = segbuf->sb_sum.ctime;
1826}
1827
1828static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
1829{
1830 struct nilfs_segment_buffer *segbuf;
1831 struct page *bd_page = NULL, *fs_page = NULL;
1832 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
1833 int update_sr = false;
1834
1835 list_for_each_entry(segbuf, &sci->sc_write_logs, sb_list) {
1836 struct buffer_head *bh;
1837
1838 list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
1839 b_assoc_buffers) {
1840 set_buffer_uptodate(bh);
1841 clear_buffer_dirty(bh);
1842 if (bh->b_page != bd_page) {
1843 if (bd_page)
1844 end_page_writeback(bd_page);
1845 bd_page = bh->b_page;
1846 }
1847 }
1848 /*
1849 * We assume that the buffers which belong to the same page
1850 * continue over the buffer list.
1851 * Under this assumption, the last BHs of pages is
1852 * identifiable by the discontinuity of bh->b_page
1853 * (page != fs_page).
1854 *
1855 * For B-tree node blocks, however, this assumption is not
1856 * guaranteed. The cleanup code of B-tree node pages needs
1857 * special care.
1858 */
1859 list_for_each_entry(bh, &segbuf->sb_payload_buffers,
1860 b_assoc_buffers) {
1861 const unsigned long set_bits = BIT(BH_Uptodate);
1862 const unsigned long clear_bits =
1863 (BIT(BH_Dirty) | BIT(BH_Async_Write) |
1864 BIT(BH_Delay) | BIT(BH_NILFS_Volatile) |
1865 BIT(BH_NILFS_Redirected));
1866
1867 set_mask_bits(&bh->b_state, clear_bits, set_bits);
1868 if (bh == segbuf->sb_super_root) {
1869 if (bh->b_page != bd_page) {
1870 end_page_writeback(bd_page);
1871 bd_page = bh->b_page;
1872 }
1873 update_sr = true;
1874 break;
1875 }
1876 if (bh->b_page != fs_page) {
1877 nilfs_end_page_io(fs_page, 0);
1878 fs_page = bh->b_page;
1879 }
1880 }
1881
1882 if (!nilfs_segbuf_simplex(segbuf)) {
1883 if (segbuf->sb_sum.flags & NILFS_SS_LOGBGN) {
1884 set_bit(NILFS_SC_UNCLOSED, &sci->sc_flags);
1885 sci->sc_lseg_stime = jiffies;
1886 }
1887 if (segbuf->sb_sum.flags & NILFS_SS_LOGEND)
1888 clear_bit(NILFS_SC_UNCLOSED, &sci->sc_flags);
1889 }
1890 }
1891 /*
1892 * Since pages may continue over multiple segment buffers,
1893 * end of the last page must be checked outside of the loop.
1894 */
1895 if (bd_page)
1896 end_page_writeback(bd_page);
1897
1898 nilfs_end_page_io(fs_page, 0);
1899
1900 nilfs_drop_collected_inodes(&sci->sc_dirty_files);
1901
1902 if (nilfs_doing_gc())
1903 nilfs_drop_collected_inodes(&sci->sc_gc_inodes);
1904 else
1905 nilfs->ns_nongc_ctime = sci->sc_seg_ctime;
1906
1907 sci->sc_nblk_inc += sci->sc_nblk_this_inc;
1908
1909 segbuf = NILFS_LAST_SEGBUF(&sci->sc_write_logs);
1910 nilfs_set_next_segment(nilfs, segbuf);
1911
1912 if (update_sr) {
1913 nilfs->ns_flushed_device = 0;
1914 nilfs_set_last_segment(nilfs, segbuf->sb_pseg_start,
1915 segbuf->sb_sum.seg_seq, nilfs->ns_cno++);
1916
1917 clear_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
1918 clear_bit(NILFS_SC_DIRTY, &sci->sc_flags);
1919 set_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags);
1920 nilfs_segctor_clear_metadata_dirty(sci);
1921 } else
1922 clear_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags);
1923}
1924
1925static int nilfs_segctor_wait(struct nilfs_sc_info *sci)
1926{
1927 int ret;
1928
1929 ret = nilfs_wait_on_logs(&sci->sc_write_logs);
1930 if (!ret) {
1931 nilfs_segctor_complete_write(sci);
1932 nilfs_destroy_logs(&sci->sc_write_logs);
1933 }
1934 return ret;
1935}
1936
1937static int nilfs_segctor_collect_dirty_files(struct nilfs_sc_info *sci,
1938 struct the_nilfs *nilfs)
1939{
1940 struct nilfs_inode_info *ii, *n;
1941 struct inode *ifile = sci->sc_root->ifile;
1942
1943 spin_lock(&nilfs->ns_inode_lock);
1944 retry:
1945 list_for_each_entry_safe(ii, n, &nilfs->ns_dirty_files, i_dirty) {
1946 if (!ii->i_bh) {
1947 struct buffer_head *ibh;
1948 int err;
1949
1950 spin_unlock(&nilfs->ns_inode_lock);
1951 err = nilfs_ifile_get_inode_block(
1952 ifile, ii->vfs_inode.i_ino, &ibh);
1953 if (unlikely(err)) {
1954 nilfs_msg(sci->sc_super, KERN_WARNING,
1955 "log writer: error %d getting inode block (ino=%lu)",
1956 err, ii->vfs_inode.i_ino);
1957 return err;
1958 }
1959 mark_buffer_dirty(ibh);
1960 nilfs_mdt_mark_dirty(ifile);
1961 spin_lock(&nilfs->ns_inode_lock);
1962 if (likely(!ii->i_bh))
1963 ii->i_bh = ibh;
1964 else
1965 brelse(ibh);
1966 goto retry;
1967 }
1968
1969 clear_bit(NILFS_I_QUEUED, &ii->i_state);
1970 set_bit(NILFS_I_BUSY, &ii->i_state);
1971 list_move_tail(&ii->i_dirty, &sci->sc_dirty_files);
1972 }
1973 spin_unlock(&nilfs->ns_inode_lock);
1974
1975 return 0;
1976}
1977
1978static void nilfs_segctor_drop_written_files(struct nilfs_sc_info *sci,
1979 struct the_nilfs *nilfs)
1980{
1981 struct nilfs_inode_info *ii, *n;
1982 int during_mount = !(sci->sc_super->s_flags & MS_ACTIVE);
1983 int defer_iput = false;
1984
1985 spin_lock(&nilfs->ns_inode_lock);
1986 list_for_each_entry_safe(ii, n, &sci->sc_dirty_files, i_dirty) {
1987 if (!test_and_clear_bit(NILFS_I_UPDATED, &ii->i_state) ||
1988 test_bit(NILFS_I_DIRTY, &ii->i_state))
1989 continue;
1990
1991 clear_bit(NILFS_I_BUSY, &ii->i_state);
1992 brelse(ii->i_bh);
1993 ii->i_bh = NULL;
1994 list_del_init(&ii->i_dirty);
1995 if (!ii->vfs_inode.i_nlink || during_mount) {
1996 /*
1997 * Defer calling iput() to avoid deadlocks if
1998 * i_nlink == 0 or mount is not yet finished.
1999 */
2000 list_add_tail(&ii->i_dirty, &sci->sc_iput_queue);
2001 defer_iput = true;
2002 } else {
2003 spin_unlock(&nilfs->ns_inode_lock);
2004 iput(&ii->vfs_inode);
2005 spin_lock(&nilfs->ns_inode_lock);
2006 }
2007 }
2008 spin_unlock(&nilfs->ns_inode_lock);
2009
2010 if (defer_iput)
2011 schedule_work(&sci->sc_iput_work);
2012}
2013
2014/*
2015 * Main procedure of segment constructor
2016 */
2017static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
2018{
2019 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
2020 int err;
2021
2022 nilfs_sc_cstage_set(sci, NILFS_ST_INIT);
2023 sci->sc_cno = nilfs->ns_cno;
2024
2025 err = nilfs_segctor_collect_dirty_files(sci, nilfs);
2026 if (unlikely(err))
2027 goto out;
2028
2029 if (nilfs_test_metadata_dirty(nilfs, sci->sc_root))
2030 set_bit(NILFS_SC_DIRTY, &sci->sc_flags);
2031
2032 if (nilfs_segctor_clean(sci))
2033 goto out;
2034
2035 do {
2036 sci->sc_stage.flags &= ~NILFS_CF_HISTORY_MASK;
2037
2038 err = nilfs_segctor_begin_construction(sci, nilfs);
2039 if (unlikely(err))
2040 goto out;
2041
2042 /* Update time stamp */
2043 sci->sc_seg_ctime = get_seconds();
2044
2045 err = nilfs_segctor_collect(sci, nilfs, mode);
2046 if (unlikely(err))
2047 goto failed;
2048
2049 /* Avoid empty segment */
2050 if (nilfs_sc_cstage_get(sci) == NILFS_ST_DONE &&
2051 nilfs_segbuf_empty(sci->sc_curseg)) {
2052 nilfs_segctor_abort_construction(sci, nilfs, 1);
2053 goto out;
2054 }
2055
2056 err = nilfs_segctor_assign(sci, mode);
2057 if (unlikely(err))
2058 goto failed;
2059
2060 if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
2061 nilfs_segctor_fill_in_file_bmap(sci);
2062
2063 if (mode == SC_LSEG_SR &&
2064 nilfs_sc_cstage_get(sci) >= NILFS_ST_CPFILE) {
2065 err = nilfs_segctor_fill_in_checkpoint(sci);
2066 if (unlikely(err))
2067 goto failed_to_write;
2068
2069 nilfs_segctor_fill_in_super_root(sci, nilfs);
2070 }
2071 nilfs_segctor_update_segusage(sci, nilfs->ns_sufile);
2072
2073 /* Write partial segments */
2074 nilfs_segctor_prepare_write(sci);
2075
2076 nilfs_add_checksums_on_logs(&sci->sc_segbufs,
2077 nilfs->ns_crc_seed);
2078
2079 err = nilfs_segctor_write(sci, nilfs);
2080 if (unlikely(err))
2081 goto failed_to_write;
2082
2083 if (nilfs_sc_cstage_get(sci) == NILFS_ST_DONE ||
2084 nilfs->ns_blocksize_bits != PAGE_SHIFT) {
2085 /*
2086 * At this point, we avoid double buffering
2087 * for blocksize < pagesize because page dirty
2088 * flag is turned off during write and dirty
2089 * buffers are not properly collected for
2090 * pages crossing over segments.
2091 */
2092 err = nilfs_segctor_wait(sci);
2093 if (err)
2094 goto failed_to_write;
2095 }
2096 } while (nilfs_sc_cstage_get(sci) != NILFS_ST_DONE);
2097
2098 out:
2099 nilfs_segctor_drop_written_files(sci, nilfs);
2100 return err;
2101
2102 failed_to_write:
2103 if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
2104 nilfs_redirty_inodes(&sci->sc_dirty_files);
2105
2106 failed:
2107 if (nilfs_doing_gc())
2108 nilfs_redirty_inodes(&sci->sc_gc_inodes);
2109 nilfs_segctor_abort_construction(sci, nilfs, err);
2110 goto out;
2111}
2112
2113/**
2114 * nilfs_segctor_start_timer - set timer of background write
2115 * @sci: nilfs_sc_info
2116 *
2117 * If the timer has already been set, it ignores the new request.
2118 * This function MUST be called within a section locking the segment
2119 * semaphore.
2120 */
2121static void nilfs_segctor_start_timer(struct nilfs_sc_info *sci)
2122{
2123 spin_lock(&sci->sc_state_lock);
2124 if (!(sci->sc_state & NILFS_SEGCTOR_COMMIT)) {
2125 sci->sc_timer.expires = jiffies + sci->sc_interval;
2126 add_timer(&sci->sc_timer);
2127 sci->sc_state |= NILFS_SEGCTOR_COMMIT;
2128 }
2129 spin_unlock(&sci->sc_state_lock);
2130}
2131
2132static void nilfs_segctor_do_flush(struct nilfs_sc_info *sci, int bn)
2133{
2134 spin_lock(&sci->sc_state_lock);
2135 if (!(sci->sc_flush_request & BIT(bn))) {
2136 unsigned long prev_req = sci->sc_flush_request;
2137
2138 sci->sc_flush_request |= BIT(bn);
2139 if (!prev_req)
2140 wake_up(&sci->sc_wait_daemon);
2141 }
2142 spin_unlock(&sci->sc_state_lock);
2143}
2144
2145/**
2146 * nilfs_flush_segment - trigger a segment construction for resource control
2147 * @sb: super block
2148 * @ino: inode number of the file to be flushed out.
2149 */
2150void nilfs_flush_segment(struct super_block *sb, ino_t ino)
2151{
2152 struct the_nilfs *nilfs = sb->s_fs_info;
2153 struct nilfs_sc_info *sci = nilfs->ns_writer;
2154
2155 if (!sci || nilfs_doing_construction())
2156 return;
2157 nilfs_segctor_do_flush(sci, NILFS_MDT_INODE(sb, ino) ? ino : 0);
2158 /* assign bit 0 to data files */
2159}
2160
2161struct nilfs_segctor_wait_request {
2162 wait_queue_t wq;
2163 __u32 seq;
2164 int err;
2165 atomic_t done;
2166};
2167
2168static int nilfs_segctor_sync(struct nilfs_sc_info *sci)
2169{
2170 struct nilfs_segctor_wait_request wait_req;
2171 int err = 0;
2172
2173 spin_lock(&sci->sc_state_lock);
2174 init_wait(&wait_req.wq);
2175 wait_req.err = 0;
2176 atomic_set(&wait_req.done, 0);
2177 wait_req.seq = ++sci->sc_seq_request;
2178 spin_unlock(&sci->sc_state_lock);
2179
2180 init_waitqueue_entry(&wait_req.wq, current);
2181 add_wait_queue(&sci->sc_wait_request, &wait_req.wq);
2182 set_current_state(TASK_INTERRUPTIBLE);
2183 wake_up(&sci->sc_wait_daemon);
2184
2185 for (;;) {
2186 if (atomic_read(&wait_req.done)) {
2187 err = wait_req.err;
2188 break;
2189 }
2190 if (!signal_pending(current)) {
2191 schedule();
2192 continue;
2193 }
2194 err = -ERESTARTSYS;
2195 break;
2196 }
2197 finish_wait(&sci->sc_wait_request, &wait_req.wq);
2198 return err;
2199}
2200
2201static void nilfs_segctor_wakeup(struct nilfs_sc_info *sci, int err)
2202{
2203 struct nilfs_segctor_wait_request *wrq, *n;
2204 unsigned long flags;
2205
2206 spin_lock_irqsave(&sci->sc_wait_request.lock, flags);
2207 list_for_each_entry_safe(wrq, n, &sci->sc_wait_request.task_list,
2208 wq.task_list) {
2209 if (!atomic_read(&wrq->done) &&
2210 nilfs_cnt32_ge(sci->sc_seq_done, wrq->seq)) {
2211 wrq->err = err;
2212 atomic_set(&wrq->done, 1);
2213 }
2214 if (atomic_read(&wrq->done)) {
2215 wrq->wq.func(&wrq->wq,
2216 TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE,
2217 0, NULL);
2218 }
2219 }
2220 spin_unlock_irqrestore(&sci->sc_wait_request.lock, flags);
2221}
2222
2223/**
2224 * nilfs_construct_segment - construct a logical segment
2225 * @sb: super block
2226 *
2227 * Return Value: On success, 0 is retured. On errors, one of the following
2228 * negative error code is returned.
2229 *
2230 * %-EROFS - Read only filesystem.
2231 *
2232 * %-EIO - I/O error
2233 *
2234 * %-ENOSPC - No space left on device (only in a panic state).
2235 *
2236 * %-ERESTARTSYS - Interrupted.
2237 *
2238 * %-ENOMEM - Insufficient memory available.
2239 */
2240int nilfs_construct_segment(struct super_block *sb)
2241{
2242 struct the_nilfs *nilfs = sb->s_fs_info;
2243 struct nilfs_sc_info *sci = nilfs->ns_writer;
2244 struct nilfs_transaction_info *ti;
2245 int err;
2246
2247 if (!sci)
2248 return -EROFS;
2249
2250 /* A call inside transactions causes a deadlock. */
2251 BUG_ON((ti = current->journal_info) && ti->ti_magic == NILFS_TI_MAGIC);
2252
2253 err = nilfs_segctor_sync(sci);
2254 return err;
2255}
2256
2257/**
2258 * nilfs_construct_dsync_segment - construct a data-only logical segment
2259 * @sb: super block
2260 * @inode: inode whose data blocks should be written out
2261 * @start: start byte offset
2262 * @end: end byte offset (inclusive)
2263 *
2264 * Return Value: On success, 0 is retured. On errors, one of the following
2265 * negative error code is returned.
2266 *
2267 * %-EROFS - Read only filesystem.
2268 *
2269 * %-EIO - I/O error
2270 *
2271 * %-ENOSPC - No space left on device (only in a panic state).
2272 *
2273 * %-ERESTARTSYS - Interrupted.
2274 *
2275 * %-ENOMEM - Insufficient memory available.
2276 */
2277int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode,
2278 loff_t start, loff_t end)
2279{
2280 struct the_nilfs *nilfs = sb->s_fs_info;
2281 struct nilfs_sc_info *sci = nilfs->ns_writer;
2282 struct nilfs_inode_info *ii;
2283 struct nilfs_transaction_info ti;
2284 int err = 0;
2285
2286 if (!sci)
2287 return -EROFS;
2288
2289 nilfs_transaction_lock(sb, &ti, 0);
2290
2291 ii = NILFS_I(inode);
2292 if (test_bit(NILFS_I_INODE_SYNC, &ii->i_state) ||
2293 nilfs_test_opt(nilfs, STRICT_ORDER) ||
2294 test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) ||
2295 nilfs_discontinued(nilfs)) {
2296 nilfs_transaction_unlock(sb);
2297 err = nilfs_segctor_sync(sci);
2298 return err;
2299 }
2300
2301 spin_lock(&nilfs->ns_inode_lock);
2302 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
2303 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
2304 spin_unlock(&nilfs->ns_inode_lock);
2305 nilfs_transaction_unlock(sb);
2306 return 0;
2307 }
2308 spin_unlock(&nilfs->ns_inode_lock);
2309 sci->sc_dsync_inode = ii;
2310 sci->sc_dsync_start = start;
2311 sci->sc_dsync_end = end;
2312
2313 err = nilfs_segctor_do_construct(sci, SC_LSEG_DSYNC);
2314 if (!err)
2315 nilfs->ns_flushed_device = 0;
2316
2317 nilfs_transaction_unlock(sb);
2318 return err;
2319}
2320
2321#define FLUSH_FILE_BIT (0x1) /* data file only */
2322#define FLUSH_DAT_BIT BIT(NILFS_DAT_INO) /* DAT only */
2323
2324/**
2325 * nilfs_segctor_accept - record accepted sequence count of log-write requests
2326 * @sci: segment constructor object
2327 */
2328static void nilfs_segctor_accept(struct nilfs_sc_info *sci)
2329{
2330 spin_lock(&sci->sc_state_lock);
2331 sci->sc_seq_accepted = sci->sc_seq_request;
2332 spin_unlock(&sci->sc_state_lock);
2333 del_timer_sync(&sci->sc_timer);
2334}
2335
2336/**
2337 * nilfs_segctor_notify - notify the result of request to caller threads
2338 * @sci: segment constructor object
2339 * @mode: mode of log forming
2340 * @err: error code to be notified
2341 */
2342static void nilfs_segctor_notify(struct nilfs_sc_info *sci, int mode, int err)
2343{
2344 /* Clear requests (even when the construction failed) */
2345 spin_lock(&sci->sc_state_lock);
2346
2347 if (mode == SC_LSEG_SR) {
2348 sci->sc_state &= ~NILFS_SEGCTOR_COMMIT;
2349 sci->sc_seq_done = sci->sc_seq_accepted;
2350 nilfs_segctor_wakeup(sci, err);
2351 sci->sc_flush_request = 0;
2352 } else {
2353 if (mode == SC_FLUSH_FILE)
2354 sci->sc_flush_request &= ~FLUSH_FILE_BIT;
2355 else if (mode == SC_FLUSH_DAT)
2356 sci->sc_flush_request &= ~FLUSH_DAT_BIT;
2357
2358 /* re-enable timer if checkpoint creation was not done */
2359 if ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
2360 time_before(jiffies, sci->sc_timer.expires))
2361 add_timer(&sci->sc_timer);
2362 }
2363 spin_unlock(&sci->sc_state_lock);
2364}
2365
2366/**
2367 * nilfs_segctor_construct - form logs and write them to disk
2368 * @sci: segment constructor object
2369 * @mode: mode of log forming
2370 */
2371static int nilfs_segctor_construct(struct nilfs_sc_info *sci, int mode)
2372{
2373 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
2374 struct nilfs_super_block **sbp;
2375 int err = 0;
2376
2377 nilfs_segctor_accept(sci);
2378
2379 if (nilfs_discontinued(nilfs))
2380 mode = SC_LSEG_SR;
2381 if (!nilfs_segctor_confirm(sci))
2382 err = nilfs_segctor_do_construct(sci, mode);
2383
2384 if (likely(!err)) {
2385 if (mode != SC_FLUSH_DAT)
2386 atomic_set(&nilfs->ns_ndirtyblks, 0);
2387 if (test_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags) &&
2388 nilfs_discontinued(nilfs)) {
2389 down_write(&nilfs->ns_sem);
2390 err = -EIO;
2391 sbp = nilfs_prepare_super(sci->sc_super,
2392 nilfs_sb_will_flip(nilfs));
2393 if (likely(sbp)) {
2394 nilfs_set_log_cursor(sbp[0], nilfs);
2395 err = nilfs_commit_super(sci->sc_super,
2396 NILFS_SB_COMMIT);
2397 }
2398 up_write(&nilfs->ns_sem);
2399 }
2400 }
2401
2402 nilfs_segctor_notify(sci, mode, err);
2403 return err;
2404}
2405
2406static void nilfs_construction_timeout(unsigned long data)
2407{
2408 struct task_struct *p = (struct task_struct *)data;
2409
2410 wake_up_process(p);
2411}
2412
2413static void
2414nilfs_remove_written_gcinodes(struct the_nilfs *nilfs, struct list_head *head)
2415{
2416 struct nilfs_inode_info *ii, *n;
2417
2418 list_for_each_entry_safe(ii, n, head, i_dirty) {
2419 if (!test_bit(NILFS_I_UPDATED, &ii->i_state))
2420 continue;
2421 list_del_init(&ii->i_dirty);
2422 truncate_inode_pages(&ii->vfs_inode.i_data, 0);
2423 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
2424 iput(&ii->vfs_inode);
2425 }
2426}
2427
2428int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv,
2429 void **kbufs)
2430{
2431 struct the_nilfs *nilfs = sb->s_fs_info;
2432 struct nilfs_sc_info *sci = nilfs->ns_writer;
2433 struct nilfs_transaction_info ti;
2434 int err;
2435
2436 if (unlikely(!sci))
2437 return -EROFS;
2438
2439 nilfs_transaction_lock(sb, &ti, 1);
2440
2441 err = nilfs_mdt_save_to_shadow_map(nilfs->ns_dat);
2442 if (unlikely(err))
2443 goto out_unlock;
2444
2445 err = nilfs_ioctl_prepare_clean_segments(nilfs, argv, kbufs);
2446 if (unlikely(err)) {
2447 nilfs_mdt_restore_from_shadow_map(nilfs->ns_dat);
2448 goto out_unlock;
2449 }
2450
2451 sci->sc_freesegs = kbufs[4];
2452 sci->sc_nfreesegs = argv[4].v_nmembs;
2453 list_splice_tail_init(&nilfs->ns_gc_inodes, &sci->sc_gc_inodes);
2454
2455 for (;;) {
2456 err = nilfs_segctor_construct(sci, SC_LSEG_SR);
2457 nilfs_remove_written_gcinodes(nilfs, &sci->sc_gc_inodes);
2458
2459 if (likely(!err))
2460 break;
2461
2462 nilfs_msg(sb, KERN_WARNING, "error %d cleaning segments", err);
2463 set_current_state(TASK_INTERRUPTIBLE);
2464 schedule_timeout(sci->sc_interval);
2465 }
2466 if (nilfs_test_opt(nilfs, DISCARD)) {
2467 int ret = nilfs_discard_segments(nilfs, sci->sc_freesegs,
2468 sci->sc_nfreesegs);
2469 if (ret) {
2470 nilfs_msg(sb, KERN_WARNING,
2471 "error %d on discard request, turning discards off for the device",
2472 ret);
2473 nilfs_clear_opt(nilfs, DISCARD);
2474 }
2475 }
2476
2477 out_unlock:
2478 sci->sc_freesegs = NULL;
2479 sci->sc_nfreesegs = 0;
2480 nilfs_mdt_clear_shadow_map(nilfs->ns_dat);
2481 nilfs_transaction_unlock(sb);
2482 return err;
2483}
2484
2485static void nilfs_segctor_thread_construct(struct nilfs_sc_info *sci, int mode)
2486{
2487 struct nilfs_transaction_info ti;
2488
2489 nilfs_transaction_lock(sci->sc_super, &ti, 0);
2490 nilfs_segctor_construct(sci, mode);
2491
2492 /*
2493 * Unclosed segment should be retried. We do this using sc_timer.
2494 * Timeout of sc_timer will invoke complete construction which leads
2495 * to close the current logical segment.
2496 */
2497 if (test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags))
2498 nilfs_segctor_start_timer(sci);
2499
2500 nilfs_transaction_unlock(sci->sc_super);
2501}
2502
2503static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *sci)
2504{
2505 int mode = 0;
2506
2507 spin_lock(&sci->sc_state_lock);
2508 mode = (sci->sc_flush_request & FLUSH_DAT_BIT) ?
2509 SC_FLUSH_DAT : SC_FLUSH_FILE;
2510 spin_unlock(&sci->sc_state_lock);
2511
2512 if (mode) {
2513 nilfs_segctor_do_construct(sci, mode);
2514
2515 spin_lock(&sci->sc_state_lock);
2516 sci->sc_flush_request &= (mode == SC_FLUSH_FILE) ?
2517 ~FLUSH_FILE_BIT : ~FLUSH_DAT_BIT;
2518 spin_unlock(&sci->sc_state_lock);
2519 }
2520 clear_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags);
2521}
2522
2523static int nilfs_segctor_flush_mode(struct nilfs_sc_info *sci)
2524{
2525 if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) ||
2526 time_before(jiffies, sci->sc_lseg_stime + sci->sc_mjcp_freq)) {
2527 if (!(sci->sc_flush_request & ~FLUSH_FILE_BIT))
2528 return SC_FLUSH_FILE;
2529 else if (!(sci->sc_flush_request & ~FLUSH_DAT_BIT))
2530 return SC_FLUSH_DAT;
2531 }
2532 return SC_LSEG_SR;
2533}
2534
2535/**
2536 * nilfs_segctor_thread - main loop of the segment constructor thread.
2537 * @arg: pointer to a struct nilfs_sc_info.
2538 *
2539 * nilfs_segctor_thread() initializes a timer and serves as a daemon
2540 * to execute segment constructions.
2541 */
2542static int nilfs_segctor_thread(void *arg)
2543{
2544 struct nilfs_sc_info *sci = (struct nilfs_sc_info *)arg;
2545 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
2546 int timeout = 0;
2547
2548 sci->sc_timer.data = (unsigned long)current;
2549 sci->sc_timer.function = nilfs_construction_timeout;
2550
2551 /* start sync. */
2552 sci->sc_task = current;
2553 wake_up(&sci->sc_wait_task); /* for nilfs_segctor_start_thread() */
2554 nilfs_msg(sci->sc_super, KERN_INFO,
2555 "segctord starting. Construction interval = %lu seconds, CP frequency < %lu seconds",
2556 sci->sc_interval / HZ, sci->sc_mjcp_freq / HZ);
2557
2558 spin_lock(&sci->sc_state_lock);
2559 loop:
2560 for (;;) {
2561 int mode;
2562
2563 if (sci->sc_state & NILFS_SEGCTOR_QUIT)
2564 goto end_thread;
2565
2566 if (timeout || sci->sc_seq_request != sci->sc_seq_done)
2567 mode = SC_LSEG_SR;
2568 else if (sci->sc_flush_request)
2569 mode = nilfs_segctor_flush_mode(sci);
2570 else
2571 break;
2572
2573 spin_unlock(&sci->sc_state_lock);
2574 nilfs_segctor_thread_construct(sci, mode);
2575 spin_lock(&sci->sc_state_lock);
2576 timeout = 0;
2577 }
2578
2579
2580 if (freezing(current)) {
2581 spin_unlock(&sci->sc_state_lock);
2582 try_to_freeze();
2583 spin_lock(&sci->sc_state_lock);
2584 } else {
2585 DEFINE_WAIT(wait);
2586 int should_sleep = 1;
2587
2588 prepare_to_wait(&sci->sc_wait_daemon, &wait,
2589 TASK_INTERRUPTIBLE);
2590
2591 if (sci->sc_seq_request != sci->sc_seq_done)
2592 should_sleep = 0;
2593 else if (sci->sc_flush_request)
2594 should_sleep = 0;
2595 else if (sci->sc_state & NILFS_SEGCTOR_COMMIT)
2596 should_sleep = time_before(jiffies,
2597 sci->sc_timer.expires);
2598
2599 if (should_sleep) {
2600 spin_unlock(&sci->sc_state_lock);
2601 schedule();
2602 spin_lock(&sci->sc_state_lock);
2603 }
2604 finish_wait(&sci->sc_wait_daemon, &wait);
2605 timeout = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
2606 time_after_eq(jiffies, sci->sc_timer.expires));
2607
2608 if (nilfs_sb_dirty(nilfs) && nilfs_sb_need_update(nilfs))
2609 set_nilfs_discontinued(nilfs);
2610 }
2611 goto loop;
2612
2613 end_thread:
2614 spin_unlock(&sci->sc_state_lock);
2615
2616 /* end sync. */
2617 sci->sc_task = NULL;
2618 wake_up(&sci->sc_wait_task); /* for nilfs_segctor_kill_thread() */
2619 return 0;
2620}
2621
2622static int nilfs_segctor_start_thread(struct nilfs_sc_info *sci)
2623{
2624 struct task_struct *t;
2625
2626 t = kthread_run(nilfs_segctor_thread, sci, "segctord");
2627 if (IS_ERR(t)) {
2628 int err = PTR_ERR(t);
2629
2630 nilfs_msg(sci->sc_super, KERN_ERR,
2631 "error %d creating segctord thread", err);
2632 return err;
2633 }
2634 wait_event(sci->sc_wait_task, sci->sc_task != NULL);
2635 return 0;
2636}
2637
2638static void nilfs_segctor_kill_thread(struct nilfs_sc_info *sci)
2639 __acquires(&sci->sc_state_lock)
2640 __releases(&sci->sc_state_lock)
2641{
2642 sci->sc_state |= NILFS_SEGCTOR_QUIT;
2643
2644 while (sci->sc_task) {
2645 wake_up(&sci->sc_wait_daemon);
2646 spin_unlock(&sci->sc_state_lock);
2647 wait_event(sci->sc_wait_task, sci->sc_task == NULL);
2648 spin_lock(&sci->sc_state_lock);
2649 }
2650}
2651
2652/*
2653 * Setup & clean-up functions
2654 */
2655static struct nilfs_sc_info *nilfs_segctor_new(struct super_block *sb,
2656 struct nilfs_root *root)
2657{
2658 struct the_nilfs *nilfs = sb->s_fs_info;
2659 struct nilfs_sc_info *sci;
2660
2661 sci = kzalloc(sizeof(*sci), GFP_KERNEL);
2662 if (!sci)
2663 return NULL;
2664
2665 sci->sc_super = sb;
2666
2667 nilfs_get_root(root);
2668 sci->sc_root = root;
2669
2670 init_waitqueue_head(&sci->sc_wait_request);
2671 init_waitqueue_head(&sci->sc_wait_daemon);
2672 init_waitqueue_head(&sci->sc_wait_task);
2673 spin_lock_init(&sci->sc_state_lock);
2674 INIT_LIST_HEAD(&sci->sc_dirty_files);
2675 INIT_LIST_HEAD(&sci->sc_segbufs);
2676 INIT_LIST_HEAD(&sci->sc_write_logs);
2677 INIT_LIST_HEAD(&sci->sc_gc_inodes);
2678 INIT_LIST_HEAD(&sci->sc_iput_queue);
2679 INIT_WORK(&sci->sc_iput_work, nilfs_iput_work_func);
2680 init_timer(&sci->sc_timer);
2681
2682 sci->sc_interval = HZ * NILFS_SC_DEFAULT_TIMEOUT;
2683 sci->sc_mjcp_freq = HZ * NILFS_SC_DEFAULT_SR_FREQ;
2684 sci->sc_watermark = NILFS_SC_DEFAULT_WATERMARK;
2685
2686 if (nilfs->ns_interval)
2687 sci->sc_interval = HZ * nilfs->ns_interval;
2688 if (nilfs->ns_watermark)
2689 sci->sc_watermark = nilfs->ns_watermark;
2690 return sci;
2691}
2692
2693static void nilfs_segctor_write_out(struct nilfs_sc_info *sci)
2694{
2695 int ret, retrycount = NILFS_SC_CLEANUP_RETRY;
2696
2697 /*
2698 * The segctord thread was stopped and its timer was removed.
2699 * But some tasks remain.
2700 */
2701 do {
2702 struct nilfs_transaction_info ti;
2703
2704 nilfs_transaction_lock(sci->sc_super, &ti, 0);
2705 ret = nilfs_segctor_construct(sci, SC_LSEG_SR);
2706 nilfs_transaction_unlock(sci->sc_super);
2707
2708 flush_work(&sci->sc_iput_work);
2709
2710 } while (ret && retrycount-- > 0);
2711}
2712
2713/**
2714 * nilfs_segctor_destroy - destroy the segment constructor.
2715 * @sci: nilfs_sc_info
2716 *
2717 * nilfs_segctor_destroy() kills the segctord thread and frees
2718 * the nilfs_sc_info struct.
2719 * Caller must hold the segment semaphore.
2720 */
2721static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
2722{
2723 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
2724 int flag;
2725
2726 up_write(&nilfs->ns_segctor_sem);
2727
2728 spin_lock(&sci->sc_state_lock);
2729 nilfs_segctor_kill_thread(sci);
2730 flag = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) || sci->sc_flush_request
2731 || sci->sc_seq_request != sci->sc_seq_done);
2732 spin_unlock(&sci->sc_state_lock);
2733
2734 if (flush_work(&sci->sc_iput_work))
2735 flag = true;
2736
2737 if (flag || !nilfs_segctor_confirm(sci))
2738 nilfs_segctor_write_out(sci);
2739
2740 if (!list_empty(&sci->sc_dirty_files)) {
2741 nilfs_msg(sci->sc_super, KERN_WARNING,
2742 "disposed unprocessed dirty file(s) when stopping log writer");
2743 nilfs_dispose_list(nilfs, &sci->sc_dirty_files, 1);
2744 }
2745
2746 if (!list_empty(&sci->sc_iput_queue)) {
2747 nilfs_msg(sci->sc_super, KERN_WARNING,
2748 "disposed unprocessed inode(s) in iput queue when stopping log writer");
2749 nilfs_dispose_list(nilfs, &sci->sc_iput_queue, 1);
2750 }
2751
2752 WARN_ON(!list_empty(&sci->sc_segbufs));
2753 WARN_ON(!list_empty(&sci->sc_write_logs));
2754
2755 nilfs_put_root(sci->sc_root);
2756
2757 down_write(&nilfs->ns_segctor_sem);
2758
2759 del_timer_sync(&sci->sc_timer);
2760 kfree(sci);
2761}
2762
2763/**
2764 * nilfs_attach_log_writer - attach log writer
2765 * @sb: super block instance
2766 * @root: root object of the current filesystem tree
2767 *
2768 * This allocates a log writer object, initializes it, and starts the
2769 * log writer.
2770 *
2771 * Return Value: On success, 0 is returned. On error, one of the following
2772 * negative error code is returned.
2773 *
2774 * %-ENOMEM - Insufficient memory available.
2775 */
2776int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root)
2777{
2778 struct the_nilfs *nilfs = sb->s_fs_info;
2779 int err;
2780
2781 if (nilfs->ns_writer) {
2782 /*
2783 * This happens if the filesystem was remounted
2784 * read/write after nilfs_error degenerated it into a
2785 * read-only mount.
2786 */
2787 nilfs_detach_log_writer(sb);
2788 }
2789
2790 nilfs->ns_writer = nilfs_segctor_new(sb, root);
2791 if (!nilfs->ns_writer)
2792 return -ENOMEM;
2793
2794 err = nilfs_segctor_start_thread(nilfs->ns_writer);
2795 if (err) {
2796 kfree(nilfs->ns_writer);
2797 nilfs->ns_writer = NULL;
2798 }
2799 return err;
2800}
2801
2802/**
2803 * nilfs_detach_log_writer - destroy log writer
2804 * @sb: super block instance
2805 *
2806 * This kills log writer daemon, frees the log writer object, and
2807 * destroys list of dirty files.
2808 */
2809void nilfs_detach_log_writer(struct super_block *sb)
2810{
2811 struct the_nilfs *nilfs = sb->s_fs_info;
2812 LIST_HEAD(garbage_list);
2813
2814 down_write(&nilfs->ns_segctor_sem);
2815 if (nilfs->ns_writer) {
2816 nilfs_segctor_destroy(nilfs->ns_writer);
2817 nilfs->ns_writer = NULL;
2818 }
2819
2820 /* Force to free the list of dirty files */
2821 spin_lock(&nilfs->ns_inode_lock);
2822 if (!list_empty(&nilfs->ns_dirty_files)) {
2823 list_splice_init(&nilfs->ns_dirty_files, &garbage_list);
2824 nilfs_msg(sb, KERN_WARNING,
2825 "disposed unprocessed dirty file(s) when detaching log writer");
2826 }
2827 spin_unlock(&nilfs->ns_inode_lock);
2828 up_write(&nilfs->ns_segctor_sem);
2829
2830 nilfs_dispose_list(nilfs, &garbage_list, 1);
2831}