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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 "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}
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * NILFS segment constructor.
4 *
5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Written by Ryusuke Konishi.
8 *
9 */
10
11#include <linux/pagemap.h>
12#include <linux/buffer_head.h>
13#include <linux/writeback.h>
14#include <linux/bitops.h>
15#include <linux/bio.h>
16#include <linux/completion.h>
17#include <linux/blkdev.h>
18#include <linux/backing-dev.h>
19#include <linux/freezer.h>
20#include <linux/kthread.h>
21#include <linux/crc32.h>
22#include <linux/pagevec.h>
23#include <linux/slab.h>
24#include <linux/sched/signal.h>
25
26#include "nilfs.h"
27#include "btnode.h"
28#include "page.h"
29#include "segment.h"
30#include "sufile.h"
31#include "cpfile.h"
32#include "ifile.h"
33#include "segbuf.h"
34
35
36/*
37 * Segment constructor
38 */
39#define SC_N_INODEVEC 16 /* Size of locally allocated inode vector */
40
41#define SC_MAX_SEGDELTA 64 /*
42 * Upper limit of the number of segments
43 * appended in collection retry loop
44 */
45
46/* Construction mode */
47enum {
48 SC_LSEG_SR = 1, /* Make a logical segment having a super root */
49 SC_LSEG_DSYNC, /*
50 * Flush data blocks of a given file and make
51 * a logical segment without a super root.
52 */
53 SC_FLUSH_FILE, /*
54 * Flush data files, leads to segment writes without
55 * creating a checkpoint.
56 */
57 SC_FLUSH_DAT, /*
58 * Flush DAT file. This also creates segments
59 * without a checkpoint.
60 */
61};
62
63/* Stage numbers of dirty block collection */
64enum {
65 NILFS_ST_INIT = 0,
66 NILFS_ST_GC, /* Collecting dirty blocks for GC */
67 NILFS_ST_FILE,
68 NILFS_ST_IFILE,
69 NILFS_ST_CPFILE,
70 NILFS_ST_SUFILE,
71 NILFS_ST_DAT,
72 NILFS_ST_SR, /* Super root */
73 NILFS_ST_DSYNC, /* Data sync blocks */
74 NILFS_ST_DONE,
75};
76
77#define CREATE_TRACE_POINTS
78#include <trace/events/nilfs2.h>
79
80/*
81 * nilfs_sc_cstage_inc(), nilfs_sc_cstage_set(), nilfs_sc_cstage_get() are
82 * wrapper functions of stage count (nilfs_sc_info->sc_stage.scnt). Users of
83 * the variable must use them because transition of stage count must involve
84 * trace events (trace_nilfs2_collection_stage_transition).
85 *
86 * nilfs_sc_cstage_get() isn't required for the above purpose because it doesn't
87 * produce tracepoint events. It is provided just for making the intention
88 * clear.
89 */
90static inline void nilfs_sc_cstage_inc(struct nilfs_sc_info *sci)
91{
92 sci->sc_stage.scnt++;
93 trace_nilfs2_collection_stage_transition(sci);
94}
95
96static inline void nilfs_sc_cstage_set(struct nilfs_sc_info *sci, int next_scnt)
97{
98 sci->sc_stage.scnt = next_scnt;
99 trace_nilfs2_collection_stage_transition(sci);
100}
101
102static inline int nilfs_sc_cstage_get(struct nilfs_sc_info *sci)
103{
104 return sci->sc_stage.scnt;
105}
106
107/* State flags of collection */
108#define NILFS_CF_NODE 0x0001 /* Collecting node blocks */
109#define NILFS_CF_IFILE_STARTED 0x0002 /* IFILE stage has started */
110#define NILFS_CF_SUFREED 0x0004 /* segment usages has been freed */
111#define NILFS_CF_HISTORY_MASK (NILFS_CF_IFILE_STARTED | NILFS_CF_SUFREED)
112
113/* Operations depending on the construction mode and file type */
114struct nilfs_sc_operations {
115 int (*collect_data)(struct nilfs_sc_info *, struct buffer_head *,
116 struct inode *);
117 int (*collect_node)(struct nilfs_sc_info *, struct buffer_head *,
118 struct inode *);
119 int (*collect_bmap)(struct nilfs_sc_info *, struct buffer_head *,
120 struct inode *);
121 void (*write_data_binfo)(struct nilfs_sc_info *,
122 struct nilfs_segsum_pointer *,
123 union nilfs_binfo *);
124 void (*write_node_binfo)(struct nilfs_sc_info *,
125 struct nilfs_segsum_pointer *,
126 union nilfs_binfo *);
127};
128
129/*
130 * Other definitions
131 */
132static void nilfs_segctor_start_timer(struct nilfs_sc_info *);
133static void nilfs_segctor_do_flush(struct nilfs_sc_info *, int);
134static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *);
135static void nilfs_dispose_list(struct the_nilfs *, struct list_head *, int);
136
137#define nilfs_cnt32_ge(a, b) \
138 (typecheck(__u32, a) && typecheck(__u32, b) && \
139 ((__s32)(a) - (__s32)(b) >= 0))
140
141static int nilfs_prepare_segment_lock(struct super_block *sb,
142 struct nilfs_transaction_info *ti)
143{
144 struct nilfs_transaction_info *cur_ti = current->journal_info;
145 void *save = NULL;
146
147 if (cur_ti) {
148 if (cur_ti->ti_magic == NILFS_TI_MAGIC)
149 return ++cur_ti->ti_count;
150
151 /*
152 * If journal_info field is occupied by other FS,
153 * it is saved and will be restored on
154 * nilfs_transaction_commit().
155 */
156 nilfs_warn(sb, "journal info from a different FS");
157 save = current->journal_info;
158 }
159 if (!ti) {
160 ti = kmem_cache_alloc(nilfs_transaction_cachep, GFP_NOFS);
161 if (!ti)
162 return -ENOMEM;
163 ti->ti_flags = NILFS_TI_DYNAMIC_ALLOC;
164 } else {
165 ti->ti_flags = 0;
166 }
167 ti->ti_count = 0;
168 ti->ti_save = save;
169 ti->ti_magic = NILFS_TI_MAGIC;
170 current->journal_info = ti;
171 return 0;
172}
173
174/**
175 * nilfs_transaction_begin - start indivisible file operations.
176 * @sb: super block
177 * @ti: nilfs_transaction_info
178 * @vacancy_check: flags for vacancy rate checks
179 *
180 * nilfs_transaction_begin() acquires a reader/writer semaphore, called
181 * the segment semaphore, to make a segment construction and write tasks
182 * exclusive. The function is used with nilfs_transaction_commit() in pairs.
183 * The region enclosed by these two functions can be nested. To avoid a
184 * deadlock, the semaphore is only acquired or released in the outermost call.
185 *
186 * This function allocates a nilfs_transaction_info struct to keep context
187 * information on it. It is initialized and hooked onto the current task in
188 * the outermost call. If a pre-allocated struct is given to @ti, it is used
189 * instead; otherwise a new struct is assigned from a slab.
190 *
191 * When @vacancy_check flag is set, this function will check the amount of
192 * free space, and will wait for the GC to reclaim disk space if low capacity.
193 *
194 * Return Value: On success, 0 is returned. On error, one of the following
195 * negative error code is returned.
196 *
197 * %-ENOMEM - Insufficient memory available.
198 *
199 * %-ENOSPC - No space left on device
200 */
201int nilfs_transaction_begin(struct super_block *sb,
202 struct nilfs_transaction_info *ti,
203 int vacancy_check)
204{
205 struct the_nilfs *nilfs;
206 int ret = nilfs_prepare_segment_lock(sb, ti);
207 struct nilfs_transaction_info *trace_ti;
208
209 if (unlikely(ret < 0))
210 return ret;
211 if (ret > 0) {
212 trace_ti = current->journal_info;
213
214 trace_nilfs2_transaction_transition(sb, trace_ti,
215 trace_ti->ti_count, trace_ti->ti_flags,
216 TRACE_NILFS2_TRANSACTION_BEGIN);
217 return 0;
218 }
219
220 sb_start_intwrite(sb);
221
222 nilfs = sb->s_fs_info;
223 down_read(&nilfs->ns_segctor_sem);
224 if (vacancy_check && nilfs_near_disk_full(nilfs)) {
225 up_read(&nilfs->ns_segctor_sem);
226 ret = -ENOSPC;
227 goto failed;
228 }
229
230 trace_ti = current->journal_info;
231 trace_nilfs2_transaction_transition(sb, trace_ti, trace_ti->ti_count,
232 trace_ti->ti_flags,
233 TRACE_NILFS2_TRANSACTION_BEGIN);
234 return 0;
235
236 failed:
237 ti = current->journal_info;
238 current->journal_info = ti->ti_save;
239 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
240 kmem_cache_free(nilfs_transaction_cachep, ti);
241 sb_end_intwrite(sb);
242 return ret;
243}
244
245/**
246 * nilfs_transaction_commit - commit indivisible file operations.
247 * @sb: super block
248 *
249 * nilfs_transaction_commit() releases the read semaphore which is
250 * acquired by nilfs_transaction_begin(). This is only performed
251 * in outermost call of this function. If a commit flag is set,
252 * nilfs_transaction_commit() sets a timer to start the segment
253 * constructor. If a sync flag is set, it starts construction
254 * directly.
255 */
256int nilfs_transaction_commit(struct super_block *sb)
257{
258 struct nilfs_transaction_info *ti = current->journal_info;
259 struct the_nilfs *nilfs = sb->s_fs_info;
260 int err = 0;
261
262 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
263 ti->ti_flags |= NILFS_TI_COMMIT;
264 if (ti->ti_count > 0) {
265 ti->ti_count--;
266 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
267 ti->ti_flags, TRACE_NILFS2_TRANSACTION_COMMIT);
268 return 0;
269 }
270 if (nilfs->ns_writer) {
271 struct nilfs_sc_info *sci = nilfs->ns_writer;
272
273 if (ti->ti_flags & NILFS_TI_COMMIT)
274 nilfs_segctor_start_timer(sci);
275 if (atomic_read(&nilfs->ns_ndirtyblks) > sci->sc_watermark)
276 nilfs_segctor_do_flush(sci, 0);
277 }
278 up_read(&nilfs->ns_segctor_sem);
279 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
280 ti->ti_flags, TRACE_NILFS2_TRANSACTION_COMMIT);
281
282 current->journal_info = ti->ti_save;
283
284 if (ti->ti_flags & NILFS_TI_SYNC)
285 err = nilfs_construct_segment(sb);
286 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
287 kmem_cache_free(nilfs_transaction_cachep, ti);
288 sb_end_intwrite(sb);
289 return err;
290}
291
292void nilfs_transaction_abort(struct super_block *sb)
293{
294 struct nilfs_transaction_info *ti = current->journal_info;
295 struct the_nilfs *nilfs = sb->s_fs_info;
296
297 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
298 if (ti->ti_count > 0) {
299 ti->ti_count--;
300 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
301 ti->ti_flags, TRACE_NILFS2_TRANSACTION_ABORT);
302 return;
303 }
304 up_read(&nilfs->ns_segctor_sem);
305
306 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
307 ti->ti_flags, TRACE_NILFS2_TRANSACTION_ABORT);
308
309 current->journal_info = ti->ti_save;
310 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
311 kmem_cache_free(nilfs_transaction_cachep, ti);
312 sb_end_intwrite(sb);
313}
314
315void nilfs_relax_pressure_in_lock(struct super_block *sb)
316{
317 struct the_nilfs *nilfs = sb->s_fs_info;
318 struct nilfs_sc_info *sci = nilfs->ns_writer;
319
320 if (sb_rdonly(sb) || unlikely(!sci) || !sci->sc_flush_request)
321 return;
322
323 set_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags);
324 up_read(&nilfs->ns_segctor_sem);
325
326 down_write(&nilfs->ns_segctor_sem);
327 if (sci->sc_flush_request &&
328 test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags)) {
329 struct nilfs_transaction_info *ti = current->journal_info;
330
331 ti->ti_flags |= NILFS_TI_WRITER;
332 nilfs_segctor_do_immediate_flush(sci);
333 ti->ti_flags &= ~NILFS_TI_WRITER;
334 }
335 downgrade_write(&nilfs->ns_segctor_sem);
336}
337
338static void nilfs_transaction_lock(struct super_block *sb,
339 struct nilfs_transaction_info *ti,
340 int gcflag)
341{
342 struct nilfs_transaction_info *cur_ti = current->journal_info;
343 struct the_nilfs *nilfs = sb->s_fs_info;
344 struct nilfs_sc_info *sci = nilfs->ns_writer;
345
346 WARN_ON(cur_ti);
347 ti->ti_flags = NILFS_TI_WRITER;
348 ti->ti_count = 0;
349 ti->ti_save = cur_ti;
350 ti->ti_magic = NILFS_TI_MAGIC;
351 current->journal_info = ti;
352
353 for (;;) {
354 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
355 ti->ti_flags, TRACE_NILFS2_TRANSACTION_TRYLOCK);
356
357 down_write(&nilfs->ns_segctor_sem);
358 if (!test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags))
359 break;
360
361 nilfs_segctor_do_immediate_flush(sci);
362
363 up_write(&nilfs->ns_segctor_sem);
364 cond_resched();
365 }
366 if (gcflag)
367 ti->ti_flags |= NILFS_TI_GC;
368
369 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
370 ti->ti_flags, TRACE_NILFS2_TRANSACTION_LOCK);
371}
372
373static void nilfs_transaction_unlock(struct super_block *sb)
374{
375 struct nilfs_transaction_info *ti = current->journal_info;
376 struct the_nilfs *nilfs = sb->s_fs_info;
377
378 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
379 BUG_ON(ti->ti_count > 0);
380
381 up_write(&nilfs->ns_segctor_sem);
382 current->journal_info = ti->ti_save;
383
384 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
385 ti->ti_flags, TRACE_NILFS2_TRANSACTION_UNLOCK);
386}
387
388static void *nilfs_segctor_map_segsum_entry(struct nilfs_sc_info *sci,
389 struct nilfs_segsum_pointer *ssp,
390 unsigned int bytes)
391{
392 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
393 unsigned int blocksize = sci->sc_super->s_blocksize;
394 void *p;
395
396 if (unlikely(ssp->offset + bytes > blocksize)) {
397 ssp->offset = 0;
398 BUG_ON(NILFS_SEGBUF_BH_IS_LAST(ssp->bh,
399 &segbuf->sb_segsum_buffers));
400 ssp->bh = NILFS_SEGBUF_NEXT_BH(ssp->bh);
401 }
402 p = ssp->bh->b_data + ssp->offset;
403 ssp->offset += bytes;
404 return p;
405}
406
407/**
408 * nilfs_segctor_reset_segment_buffer - reset the current segment buffer
409 * @sci: nilfs_sc_info
410 */
411static int nilfs_segctor_reset_segment_buffer(struct nilfs_sc_info *sci)
412{
413 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
414 struct buffer_head *sumbh;
415 unsigned int sumbytes;
416 unsigned int flags = 0;
417 int err;
418
419 if (nilfs_doing_gc())
420 flags = NILFS_SS_GC;
421 err = nilfs_segbuf_reset(segbuf, flags, sci->sc_seg_ctime, sci->sc_cno);
422 if (unlikely(err))
423 return err;
424
425 sumbh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers);
426 sumbytes = segbuf->sb_sum.sumbytes;
427 sci->sc_finfo_ptr.bh = sumbh; sci->sc_finfo_ptr.offset = sumbytes;
428 sci->sc_binfo_ptr.bh = sumbh; sci->sc_binfo_ptr.offset = sumbytes;
429 sci->sc_blk_cnt = sci->sc_datablk_cnt = 0;
430 return 0;
431}
432
433/**
434 * nilfs_segctor_zeropad_segsum - zero pad the rest of the segment summary area
435 * @sci: segment constructor object
436 *
437 * nilfs_segctor_zeropad_segsum() zero-fills unallocated space at the end of
438 * the current segment summary block.
439 */
440static void nilfs_segctor_zeropad_segsum(struct nilfs_sc_info *sci)
441{
442 struct nilfs_segsum_pointer *ssp;
443
444 ssp = sci->sc_blk_cnt > 0 ? &sci->sc_binfo_ptr : &sci->sc_finfo_ptr;
445 if (ssp->offset < ssp->bh->b_size)
446 memset(ssp->bh->b_data + ssp->offset, 0,
447 ssp->bh->b_size - ssp->offset);
448}
449
450static int nilfs_segctor_feed_segment(struct nilfs_sc_info *sci)
451{
452 sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
453 if (NILFS_SEGBUF_IS_LAST(sci->sc_curseg, &sci->sc_segbufs))
454 return -E2BIG; /*
455 * The current segment is filled up
456 * (internal code)
457 */
458 nilfs_segctor_zeropad_segsum(sci);
459 sci->sc_curseg = NILFS_NEXT_SEGBUF(sci->sc_curseg);
460 return nilfs_segctor_reset_segment_buffer(sci);
461}
462
463static int nilfs_segctor_add_super_root(struct nilfs_sc_info *sci)
464{
465 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
466 int err;
467
468 if (segbuf->sb_sum.nblocks >= segbuf->sb_rest_blocks) {
469 err = nilfs_segctor_feed_segment(sci);
470 if (err)
471 return err;
472 segbuf = sci->sc_curseg;
473 }
474 err = nilfs_segbuf_extend_payload(segbuf, &segbuf->sb_super_root);
475 if (likely(!err))
476 segbuf->sb_sum.flags |= NILFS_SS_SR;
477 return err;
478}
479
480/*
481 * Functions for making segment summary and payloads
482 */
483static int nilfs_segctor_segsum_block_required(
484 struct nilfs_sc_info *sci, const struct nilfs_segsum_pointer *ssp,
485 unsigned int binfo_size)
486{
487 unsigned int blocksize = sci->sc_super->s_blocksize;
488 /* Size of finfo and binfo is enough small against blocksize */
489
490 return ssp->offset + binfo_size +
491 (!sci->sc_blk_cnt ? sizeof(struct nilfs_finfo) : 0) >
492 blocksize;
493}
494
495static void nilfs_segctor_begin_finfo(struct nilfs_sc_info *sci,
496 struct inode *inode)
497{
498 sci->sc_curseg->sb_sum.nfinfo++;
499 sci->sc_binfo_ptr = sci->sc_finfo_ptr;
500 nilfs_segctor_map_segsum_entry(
501 sci, &sci->sc_binfo_ptr, sizeof(struct nilfs_finfo));
502
503 if (NILFS_I(inode)->i_root &&
504 !test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags))
505 set_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
506 /* skip finfo */
507}
508
509static void nilfs_segctor_end_finfo(struct nilfs_sc_info *sci,
510 struct inode *inode)
511{
512 struct nilfs_finfo *finfo;
513 struct nilfs_inode_info *ii;
514 struct nilfs_segment_buffer *segbuf;
515 __u64 cno;
516
517 if (sci->sc_blk_cnt == 0)
518 return;
519
520 ii = NILFS_I(inode);
521
522 if (test_bit(NILFS_I_GCINODE, &ii->i_state))
523 cno = ii->i_cno;
524 else if (NILFS_ROOT_METADATA_FILE(inode->i_ino))
525 cno = 0;
526 else
527 cno = sci->sc_cno;
528
529 finfo = nilfs_segctor_map_segsum_entry(sci, &sci->sc_finfo_ptr,
530 sizeof(*finfo));
531 finfo->fi_ino = cpu_to_le64(inode->i_ino);
532 finfo->fi_nblocks = cpu_to_le32(sci->sc_blk_cnt);
533 finfo->fi_ndatablk = cpu_to_le32(sci->sc_datablk_cnt);
534 finfo->fi_cno = cpu_to_le64(cno);
535
536 segbuf = sci->sc_curseg;
537 segbuf->sb_sum.sumbytes = sci->sc_binfo_ptr.offset +
538 sci->sc_super->s_blocksize * (segbuf->sb_sum.nsumblk - 1);
539 sci->sc_finfo_ptr = sci->sc_binfo_ptr;
540 sci->sc_blk_cnt = sci->sc_datablk_cnt = 0;
541}
542
543static int nilfs_segctor_add_file_block(struct nilfs_sc_info *sci,
544 struct buffer_head *bh,
545 struct inode *inode,
546 unsigned int binfo_size)
547{
548 struct nilfs_segment_buffer *segbuf;
549 int required, err = 0;
550
551 retry:
552 segbuf = sci->sc_curseg;
553 required = nilfs_segctor_segsum_block_required(
554 sci, &sci->sc_binfo_ptr, binfo_size);
555 if (segbuf->sb_sum.nblocks + required + 1 > segbuf->sb_rest_blocks) {
556 nilfs_segctor_end_finfo(sci, inode);
557 err = nilfs_segctor_feed_segment(sci);
558 if (err)
559 return err;
560 goto retry;
561 }
562 if (unlikely(required)) {
563 nilfs_segctor_zeropad_segsum(sci);
564 err = nilfs_segbuf_extend_segsum(segbuf);
565 if (unlikely(err))
566 goto failed;
567 }
568 if (sci->sc_blk_cnt == 0)
569 nilfs_segctor_begin_finfo(sci, inode);
570
571 nilfs_segctor_map_segsum_entry(sci, &sci->sc_binfo_ptr, binfo_size);
572 /* Substitution to vblocknr is delayed until update_blocknr() */
573 nilfs_segbuf_add_file_buffer(segbuf, bh);
574 sci->sc_blk_cnt++;
575 failed:
576 return err;
577}
578
579/*
580 * Callback functions that enumerate, mark, and collect dirty blocks
581 */
582static int nilfs_collect_file_data(struct nilfs_sc_info *sci,
583 struct buffer_head *bh, struct inode *inode)
584{
585 int err;
586
587 err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
588 if (err < 0)
589 return err;
590
591 err = nilfs_segctor_add_file_block(sci, bh, inode,
592 sizeof(struct nilfs_binfo_v));
593 if (!err)
594 sci->sc_datablk_cnt++;
595 return err;
596}
597
598static int nilfs_collect_file_node(struct nilfs_sc_info *sci,
599 struct buffer_head *bh,
600 struct inode *inode)
601{
602 return nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
603}
604
605static int nilfs_collect_file_bmap(struct nilfs_sc_info *sci,
606 struct buffer_head *bh,
607 struct inode *inode)
608{
609 WARN_ON(!buffer_dirty(bh));
610 return nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
611}
612
613static void nilfs_write_file_data_binfo(struct nilfs_sc_info *sci,
614 struct nilfs_segsum_pointer *ssp,
615 union nilfs_binfo *binfo)
616{
617 struct nilfs_binfo_v *binfo_v = nilfs_segctor_map_segsum_entry(
618 sci, ssp, sizeof(*binfo_v));
619 *binfo_v = binfo->bi_v;
620}
621
622static void nilfs_write_file_node_binfo(struct nilfs_sc_info *sci,
623 struct nilfs_segsum_pointer *ssp,
624 union nilfs_binfo *binfo)
625{
626 __le64 *vblocknr = nilfs_segctor_map_segsum_entry(
627 sci, ssp, sizeof(*vblocknr));
628 *vblocknr = binfo->bi_v.bi_vblocknr;
629}
630
631static const struct nilfs_sc_operations nilfs_sc_file_ops = {
632 .collect_data = nilfs_collect_file_data,
633 .collect_node = nilfs_collect_file_node,
634 .collect_bmap = nilfs_collect_file_bmap,
635 .write_data_binfo = nilfs_write_file_data_binfo,
636 .write_node_binfo = nilfs_write_file_node_binfo,
637};
638
639static int nilfs_collect_dat_data(struct nilfs_sc_info *sci,
640 struct buffer_head *bh, struct inode *inode)
641{
642 int err;
643
644 err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
645 if (err < 0)
646 return err;
647
648 err = nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
649 if (!err)
650 sci->sc_datablk_cnt++;
651 return err;
652}
653
654static int nilfs_collect_dat_bmap(struct nilfs_sc_info *sci,
655 struct buffer_head *bh, struct inode *inode)
656{
657 WARN_ON(!buffer_dirty(bh));
658 return nilfs_segctor_add_file_block(sci, bh, inode,
659 sizeof(struct nilfs_binfo_dat));
660}
661
662static void nilfs_write_dat_data_binfo(struct nilfs_sc_info *sci,
663 struct nilfs_segsum_pointer *ssp,
664 union nilfs_binfo *binfo)
665{
666 __le64 *blkoff = nilfs_segctor_map_segsum_entry(sci, ssp,
667 sizeof(*blkoff));
668 *blkoff = binfo->bi_dat.bi_blkoff;
669}
670
671static void nilfs_write_dat_node_binfo(struct nilfs_sc_info *sci,
672 struct nilfs_segsum_pointer *ssp,
673 union nilfs_binfo *binfo)
674{
675 struct nilfs_binfo_dat *binfo_dat =
676 nilfs_segctor_map_segsum_entry(sci, ssp, sizeof(*binfo_dat));
677 *binfo_dat = binfo->bi_dat;
678}
679
680static const struct nilfs_sc_operations nilfs_sc_dat_ops = {
681 .collect_data = nilfs_collect_dat_data,
682 .collect_node = nilfs_collect_file_node,
683 .collect_bmap = nilfs_collect_dat_bmap,
684 .write_data_binfo = nilfs_write_dat_data_binfo,
685 .write_node_binfo = nilfs_write_dat_node_binfo,
686};
687
688static const struct nilfs_sc_operations nilfs_sc_dsync_ops = {
689 .collect_data = nilfs_collect_file_data,
690 .collect_node = NULL,
691 .collect_bmap = NULL,
692 .write_data_binfo = nilfs_write_file_data_binfo,
693 .write_node_binfo = NULL,
694};
695
696static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode,
697 struct list_head *listp,
698 size_t nlimit,
699 loff_t start, loff_t end)
700{
701 struct address_space *mapping = inode->i_mapping;
702 struct folio_batch fbatch;
703 pgoff_t index = 0, last = ULONG_MAX;
704 size_t ndirties = 0;
705 int i;
706
707 if (unlikely(start != 0 || end != LLONG_MAX)) {
708 /*
709 * A valid range is given for sync-ing data pages. The
710 * range is rounded to per-page; extra dirty buffers
711 * may be included if blocksize < pagesize.
712 */
713 index = start >> PAGE_SHIFT;
714 last = end >> PAGE_SHIFT;
715 }
716 folio_batch_init(&fbatch);
717 repeat:
718 if (unlikely(index > last) ||
719 !filemap_get_folios_tag(mapping, &index, last,
720 PAGECACHE_TAG_DIRTY, &fbatch))
721 return ndirties;
722
723 for (i = 0; i < folio_batch_count(&fbatch); i++) {
724 struct buffer_head *bh, *head;
725 struct folio *folio = fbatch.folios[i];
726
727 folio_lock(folio);
728 if (unlikely(folio->mapping != mapping)) {
729 /* Exclude folios removed from the address space */
730 folio_unlock(folio);
731 continue;
732 }
733 head = folio_buffers(folio);
734 if (!head)
735 head = create_empty_buffers(folio,
736 i_blocksize(inode), 0);
737 folio_unlock(folio);
738
739 bh = head;
740 do {
741 if (!buffer_dirty(bh) || buffer_async_write(bh))
742 continue;
743 get_bh(bh);
744 list_add_tail(&bh->b_assoc_buffers, listp);
745 ndirties++;
746 if (unlikely(ndirties >= nlimit)) {
747 folio_batch_release(&fbatch);
748 cond_resched();
749 return ndirties;
750 }
751 } while (bh = bh->b_this_page, bh != head);
752 }
753 folio_batch_release(&fbatch);
754 cond_resched();
755 goto repeat;
756}
757
758static void nilfs_lookup_dirty_node_buffers(struct inode *inode,
759 struct list_head *listp)
760{
761 struct nilfs_inode_info *ii = NILFS_I(inode);
762 struct inode *btnc_inode = ii->i_assoc_inode;
763 struct folio_batch fbatch;
764 struct buffer_head *bh, *head;
765 unsigned int i;
766 pgoff_t index = 0;
767
768 if (!btnc_inode)
769 return;
770 folio_batch_init(&fbatch);
771
772 while (filemap_get_folios_tag(btnc_inode->i_mapping, &index,
773 (pgoff_t)-1, PAGECACHE_TAG_DIRTY, &fbatch)) {
774 for (i = 0; i < folio_batch_count(&fbatch); i++) {
775 bh = head = folio_buffers(fbatch.folios[i]);
776 do {
777 if (buffer_dirty(bh) &&
778 !buffer_async_write(bh)) {
779 get_bh(bh);
780 list_add_tail(&bh->b_assoc_buffers,
781 listp);
782 }
783 bh = bh->b_this_page;
784 } while (bh != head);
785 }
786 folio_batch_release(&fbatch);
787 cond_resched();
788 }
789}
790
791static void nilfs_dispose_list(struct the_nilfs *nilfs,
792 struct list_head *head, int force)
793{
794 struct nilfs_inode_info *ii, *n;
795 struct nilfs_inode_info *ivec[SC_N_INODEVEC], **pii;
796 unsigned int nv = 0;
797
798 while (!list_empty(head)) {
799 spin_lock(&nilfs->ns_inode_lock);
800 list_for_each_entry_safe(ii, n, head, i_dirty) {
801 list_del_init(&ii->i_dirty);
802 if (force) {
803 if (unlikely(ii->i_bh)) {
804 brelse(ii->i_bh);
805 ii->i_bh = NULL;
806 }
807 } else if (test_bit(NILFS_I_DIRTY, &ii->i_state)) {
808 set_bit(NILFS_I_QUEUED, &ii->i_state);
809 list_add_tail(&ii->i_dirty,
810 &nilfs->ns_dirty_files);
811 continue;
812 }
813 ivec[nv++] = ii;
814 if (nv == SC_N_INODEVEC)
815 break;
816 }
817 spin_unlock(&nilfs->ns_inode_lock);
818
819 for (pii = ivec; nv > 0; pii++, nv--)
820 iput(&(*pii)->vfs_inode);
821 }
822}
823
824static void nilfs_iput_work_func(struct work_struct *work)
825{
826 struct nilfs_sc_info *sci = container_of(work, struct nilfs_sc_info,
827 sc_iput_work);
828 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
829
830 nilfs_dispose_list(nilfs, &sci->sc_iput_queue, 0);
831}
832
833static int nilfs_test_metadata_dirty(struct the_nilfs *nilfs,
834 struct nilfs_root *root)
835{
836 int ret = 0;
837
838 if (nilfs_mdt_fetch_dirty(root->ifile))
839 ret++;
840 if (nilfs_mdt_fetch_dirty(nilfs->ns_cpfile))
841 ret++;
842 if (nilfs_mdt_fetch_dirty(nilfs->ns_sufile))
843 ret++;
844 if ((ret || nilfs_doing_gc()) && nilfs_mdt_fetch_dirty(nilfs->ns_dat))
845 ret++;
846 return ret;
847}
848
849static int nilfs_segctor_clean(struct nilfs_sc_info *sci)
850{
851 return list_empty(&sci->sc_dirty_files) &&
852 !test_bit(NILFS_SC_DIRTY, &sci->sc_flags) &&
853 sci->sc_nfreesegs == 0 &&
854 (!nilfs_doing_gc() || list_empty(&sci->sc_gc_inodes));
855}
856
857static int nilfs_segctor_confirm(struct nilfs_sc_info *sci)
858{
859 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
860 int ret = 0;
861
862 if (nilfs_test_metadata_dirty(nilfs, sci->sc_root))
863 set_bit(NILFS_SC_DIRTY, &sci->sc_flags);
864
865 spin_lock(&nilfs->ns_inode_lock);
866 if (list_empty(&nilfs->ns_dirty_files) && nilfs_segctor_clean(sci))
867 ret++;
868
869 spin_unlock(&nilfs->ns_inode_lock);
870 return ret;
871}
872
873static void nilfs_segctor_clear_metadata_dirty(struct nilfs_sc_info *sci)
874{
875 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
876
877 nilfs_mdt_clear_dirty(sci->sc_root->ifile);
878 nilfs_mdt_clear_dirty(nilfs->ns_cpfile);
879 nilfs_mdt_clear_dirty(nilfs->ns_sufile);
880 nilfs_mdt_clear_dirty(nilfs->ns_dat);
881}
882
883static int nilfs_segctor_create_checkpoint(struct nilfs_sc_info *sci)
884{
885 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
886 struct buffer_head *bh_cp;
887 struct nilfs_checkpoint *raw_cp;
888 int err;
889
890 /* XXX: this interface will be changed */
891 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 1,
892 &raw_cp, &bh_cp);
893 if (likely(!err)) {
894 /*
895 * The following code is duplicated with cpfile. But, it is
896 * needed to collect the checkpoint even if it was not newly
897 * created.
898 */
899 mark_buffer_dirty(bh_cp);
900 nilfs_mdt_mark_dirty(nilfs->ns_cpfile);
901 nilfs_cpfile_put_checkpoint(
902 nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
903 } else if (err == -EINVAL || err == -ENOENT) {
904 nilfs_error(sci->sc_super,
905 "checkpoint creation failed due to metadata corruption.");
906 err = -EIO;
907 }
908 return err;
909}
910
911static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci)
912{
913 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
914 struct buffer_head *bh_cp;
915 struct nilfs_checkpoint *raw_cp;
916 int err;
917
918 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 0,
919 &raw_cp, &bh_cp);
920 if (unlikely(err)) {
921 if (err == -EINVAL || err == -ENOENT) {
922 nilfs_error(sci->sc_super,
923 "checkpoint finalization failed due to metadata corruption.");
924 err = -EIO;
925 }
926 goto failed_ibh;
927 }
928 raw_cp->cp_snapshot_list.ssl_next = 0;
929 raw_cp->cp_snapshot_list.ssl_prev = 0;
930 raw_cp->cp_inodes_count =
931 cpu_to_le64(atomic64_read(&sci->sc_root->inodes_count));
932 raw_cp->cp_blocks_count =
933 cpu_to_le64(atomic64_read(&sci->sc_root->blocks_count));
934 raw_cp->cp_nblk_inc =
935 cpu_to_le64(sci->sc_nblk_inc + sci->sc_nblk_this_inc);
936 raw_cp->cp_create = cpu_to_le64(sci->sc_seg_ctime);
937 raw_cp->cp_cno = cpu_to_le64(nilfs->ns_cno);
938
939 if (test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags))
940 nilfs_checkpoint_clear_minor(raw_cp);
941 else
942 nilfs_checkpoint_set_minor(raw_cp);
943
944 nilfs_write_inode_common(sci->sc_root->ifile,
945 &raw_cp->cp_ifile_inode, 1);
946 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
947 return 0;
948
949 failed_ibh:
950 return err;
951}
952
953static void nilfs_fill_in_file_bmap(struct inode *ifile,
954 struct nilfs_inode_info *ii)
955
956{
957 struct buffer_head *ibh;
958 struct nilfs_inode *raw_inode;
959
960 if (test_bit(NILFS_I_BMAP, &ii->i_state)) {
961 ibh = ii->i_bh;
962 BUG_ON(!ibh);
963 raw_inode = nilfs_ifile_map_inode(ifile, ii->vfs_inode.i_ino,
964 ibh);
965 nilfs_bmap_write(ii->i_bmap, raw_inode);
966 nilfs_ifile_unmap_inode(ifile, ii->vfs_inode.i_ino, ibh);
967 }
968}
969
970static void nilfs_segctor_fill_in_file_bmap(struct nilfs_sc_info *sci)
971{
972 struct nilfs_inode_info *ii;
973
974 list_for_each_entry(ii, &sci->sc_dirty_files, i_dirty) {
975 nilfs_fill_in_file_bmap(sci->sc_root->ifile, ii);
976 set_bit(NILFS_I_COLLECTED, &ii->i_state);
977 }
978}
979
980static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info *sci,
981 struct the_nilfs *nilfs)
982{
983 struct buffer_head *bh_sr;
984 struct nilfs_super_root *raw_sr;
985 unsigned int isz, srsz;
986
987 bh_sr = NILFS_LAST_SEGBUF(&sci->sc_segbufs)->sb_super_root;
988
989 lock_buffer(bh_sr);
990 raw_sr = (struct nilfs_super_root *)bh_sr->b_data;
991 isz = nilfs->ns_inode_size;
992 srsz = NILFS_SR_BYTES(isz);
993
994 raw_sr->sr_sum = 0; /* Ensure initialization within this update */
995 raw_sr->sr_bytes = cpu_to_le16(srsz);
996 raw_sr->sr_nongc_ctime
997 = cpu_to_le64(nilfs_doing_gc() ?
998 nilfs->ns_nongc_ctime : sci->sc_seg_ctime);
999 raw_sr->sr_flags = 0;
1000
1001 nilfs_write_inode_common(nilfs->ns_dat, (void *)raw_sr +
1002 NILFS_SR_DAT_OFFSET(isz), 1);
1003 nilfs_write_inode_common(nilfs->ns_cpfile, (void *)raw_sr +
1004 NILFS_SR_CPFILE_OFFSET(isz), 1);
1005 nilfs_write_inode_common(nilfs->ns_sufile, (void *)raw_sr +
1006 NILFS_SR_SUFILE_OFFSET(isz), 1);
1007 memset((void *)raw_sr + srsz, 0, nilfs->ns_blocksize - srsz);
1008 set_buffer_uptodate(bh_sr);
1009 unlock_buffer(bh_sr);
1010}
1011
1012static void nilfs_redirty_inodes(struct list_head *head)
1013{
1014 struct nilfs_inode_info *ii;
1015
1016 list_for_each_entry(ii, head, i_dirty) {
1017 if (test_bit(NILFS_I_COLLECTED, &ii->i_state))
1018 clear_bit(NILFS_I_COLLECTED, &ii->i_state);
1019 }
1020}
1021
1022static void nilfs_drop_collected_inodes(struct list_head *head)
1023{
1024 struct nilfs_inode_info *ii;
1025
1026 list_for_each_entry(ii, head, i_dirty) {
1027 if (!test_and_clear_bit(NILFS_I_COLLECTED, &ii->i_state))
1028 continue;
1029
1030 clear_bit(NILFS_I_INODE_SYNC, &ii->i_state);
1031 set_bit(NILFS_I_UPDATED, &ii->i_state);
1032 }
1033}
1034
1035static int nilfs_segctor_apply_buffers(struct nilfs_sc_info *sci,
1036 struct inode *inode,
1037 struct list_head *listp,
1038 int (*collect)(struct nilfs_sc_info *,
1039 struct buffer_head *,
1040 struct inode *))
1041{
1042 struct buffer_head *bh, *n;
1043 int err = 0;
1044
1045 if (collect) {
1046 list_for_each_entry_safe(bh, n, listp, b_assoc_buffers) {
1047 list_del_init(&bh->b_assoc_buffers);
1048 err = collect(sci, bh, inode);
1049 brelse(bh);
1050 if (unlikely(err))
1051 goto dispose_buffers;
1052 }
1053 return 0;
1054 }
1055
1056 dispose_buffers:
1057 while (!list_empty(listp)) {
1058 bh = list_first_entry(listp, struct buffer_head,
1059 b_assoc_buffers);
1060 list_del_init(&bh->b_assoc_buffers);
1061 brelse(bh);
1062 }
1063 return err;
1064}
1065
1066static size_t nilfs_segctor_buffer_rest(struct nilfs_sc_info *sci)
1067{
1068 /* Remaining number of blocks within segment buffer */
1069 return sci->sc_segbuf_nblocks -
1070 (sci->sc_nblk_this_inc + sci->sc_curseg->sb_sum.nblocks);
1071}
1072
1073static int nilfs_segctor_scan_file(struct nilfs_sc_info *sci,
1074 struct inode *inode,
1075 const struct nilfs_sc_operations *sc_ops)
1076{
1077 LIST_HEAD(data_buffers);
1078 LIST_HEAD(node_buffers);
1079 int err;
1080
1081 if (!(sci->sc_stage.flags & NILFS_CF_NODE)) {
1082 size_t n, rest = nilfs_segctor_buffer_rest(sci);
1083
1084 n = nilfs_lookup_dirty_data_buffers(
1085 inode, &data_buffers, rest + 1, 0, LLONG_MAX);
1086 if (n > rest) {
1087 err = nilfs_segctor_apply_buffers(
1088 sci, inode, &data_buffers,
1089 sc_ops->collect_data);
1090 BUG_ON(!err); /* always receive -E2BIG or true error */
1091 goto break_or_fail;
1092 }
1093 }
1094 nilfs_lookup_dirty_node_buffers(inode, &node_buffers);
1095
1096 if (!(sci->sc_stage.flags & NILFS_CF_NODE)) {
1097 err = nilfs_segctor_apply_buffers(
1098 sci, inode, &data_buffers, sc_ops->collect_data);
1099 if (unlikely(err)) {
1100 /* dispose node list */
1101 nilfs_segctor_apply_buffers(
1102 sci, inode, &node_buffers, NULL);
1103 goto break_or_fail;
1104 }
1105 sci->sc_stage.flags |= NILFS_CF_NODE;
1106 }
1107 /* Collect node */
1108 err = nilfs_segctor_apply_buffers(
1109 sci, inode, &node_buffers, sc_ops->collect_node);
1110 if (unlikely(err))
1111 goto break_or_fail;
1112
1113 nilfs_bmap_lookup_dirty_buffers(NILFS_I(inode)->i_bmap, &node_buffers);
1114 err = nilfs_segctor_apply_buffers(
1115 sci, inode, &node_buffers, sc_ops->collect_bmap);
1116 if (unlikely(err))
1117 goto break_or_fail;
1118
1119 nilfs_segctor_end_finfo(sci, inode);
1120 sci->sc_stage.flags &= ~NILFS_CF_NODE;
1121
1122 break_or_fail:
1123 return err;
1124}
1125
1126static int nilfs_segctor_scan_file_dsync(struct nilfs_sc_info *sci,
1127 struct inode *inode)
1128{
1129 LIST_HEAD(data_buffers);
1130 size_t n, rest = nilfs_segctor_buffer_rest(sci);
1131 int err;
1132
1133 n = nilfs_lookup_dirty_data_buffers(inode, &data_buffers, rest + 1,
1134 sci->sc_dsync_start,
1135 sci->sc_dsync_end);
1136
1137 err = nilfs_segctor_apply_buffers(sci, inode, &data_buffers,
1138 nilfs_collect_file_data);
1139 if (!err) {
1140 nilfs_segctor_end_finfo(sci, inode);
1141 BUG_ON(n > rest);
1142 /* always receive -E2BIG or true error if n > rest */
1143 }
1144 return err;
1145}
1146
1147static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode)
1148{
1149 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
1150 struct list_head *head;
1151 struct nilfs_inode_info *ii;
1152 size_t ndone;
1153 int err = 0;
1154
1155 switch (nilfs_sc_cstage_get(sci)) {
1156 case NILFS_ST_INIT:
1157 /* Pre-processes */
1158 sci->sc_stage.flags = 0;
1159
1160 if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) {
1161 sci->sc_nblk_inc = 0;
1162 sci->sc_curseg->sb_sum.flags = NILFS_SS_LOGBGN;
1163 if (mode == SC_LSEG_DSYNC) {
1164 nilfs_sc_cstage_set(sci, NILFS_ST_DSYNC);
1165 goto dsync_mode;
1166 }
1167 }
1168
1169 sci->sc_stage.dirty_file_ptr = NULL;
1170 sci->sc_stage.gc_inode_ptr = NULL;
1171 if (mode == SC_FLUSH_DAT) {
1172 nilfs_sc_cstage_set(sci, NILFS_ST_DAT);
1173 goto dat_stage;
1174 }
1175 nilfs_sc_cstage_inc(sci);
1176 fallthrough;
1177 case NILFS_ST_GC:
1178 if (nilfs_doing_gc()) {
1179 head = &sci->sc_gc_inodes;
1180 ii = list_prepare_entry(sci->sc_stage.gc_inode_ptr,
1181 head, i_dirty);
1182 list_for_each_entry_continue(ii, head, i_dirty) {
1183 err = nilfs_segctor_scan_file(
1184 sci, &ii->vfs_inode,
1185 &nilfs_sc_file_ops);
1186 if (unlikely(err)) {
1187 sci->sc_stage.gc_inode_ptr = list_entry(
1188 ii->i_dirty.prev,
1189 struct nilfs_inode_info,
1190 i_dirty);
1191 goto break_or_fail;
1192 }
1193 set_bit(NILFS_I_COLLECTED, &ii->i_state);
1194 }
1195 sci->sc_stage.gc_inode_ptr = NULL;
1196 }
1197 nilfs_sc_cstage_inc(sci);
1198 fallthrough;
1199 case NILFS_ST_FILE:
1200 head = &sci->sc_dirty_files;
1201 ii = list_prepare_entry(sci->sc_stage.dirty_file_ptr, head,
1202 i_dirty);
1203 list_for_each_entry_continue(ii, head, i_dirty) {
1204 clear_bit(NILFS_I_DIRTY, &ii->i_state);
1205
1206 err = nilfs_segctor_scan_file(sci, &ii->vfs_inode,
1207 &nilfs_sc_file_ops);
1208 if (unlikely(err)) {
1209 sci->sc_stage.dirty_file_ptr =
1210 list_entry(ii->i_dirty.prev,
1211 struct nilfs_inode_info,
1212 i_dirty);
1213 goto break_or_fail;
1214 }
1215 /* sci->sc_stage.dirty_file_ptr = NILFS_I(inode); */
1216 /* XXX: required ? */
1217 }
1218 sci->sc_stage.dirty_file_ptr = NULL;
1219 if (mode == SC_FLUSH_FILE) {
1220 nilfs_sc_cstage_set(sci, NILFS_ST_DONE);
1221 return 0;
1222 }
1223 nilfs_sc_cstage_inc(sci);
1224 sci->sc_stage.flags |= NILFS_CF_IFILE_STARTED;
1225 fallthrough;
1226 case NILFS_ST_IFILE:
1227 err = nilfs_segctor_scan_file(sci, sci->sc_root->ifile,
1228 &nilfs_sc_file_ops);
1229 if (unlikely(err))
1230 break;
1231 nilfs_sc_cstage_inc(sci);
1232 /* Creating a checkpoint */
1233 err = nilfs_segctor_create_checkpoint(sci);
1234 if (unlikely(err))
1235 break;
1236 fallthrough;
1237 case NILFS_ST_CPFILE:
1238 err = nilfs_segctor_scan_file(sci, nilfs->ns_cpfile,
1239 &nilfs_sc_file_ops);
1240 if (unlikely(err))
1241 break;
1242 nilfs_sc_cstage_inc(sci);
1243 fallthrough;
1244 case NILFS_ST_SUFILE:
1245 err = nilfs_sufile_freev(nilfs->ns_sufile, sci->sc_freesegs,
1246 sci->sc_nfreesegs, &ndone);
1247 if (unlikely(err)) {
1248 nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1249 sci->sc_freesegs, ndone,
1250 NULL);
1251 break;
1252 }
1253 sci->sc_stage.flags |= NILFS_CF_SUFREED;
1254
1255 err = nilfs_segctor_scan_file(sci, nilfs->ns_sufile,
1256 &nilfs_sc_file_ops);
1257 if (unlikely(err))
1258 break;
1259 nilfs_sc_cstage_inc(sci);
1260 fallthrough;
1261 case NILFS_ST_DAT:
1262 dat_stage:
1263 err = nilfs_segctor_scan_file(sci, nilfs->ns_dat,
1264 &nilfs_sc_dat_ops);
1265 if (unlikely(err))
1266 break;
1267 if (mode == SC_FLUSH_DAT) {
1268 nilfs_sc_cstage_set(sci, NILFS_ST_DONE);
1269 return 0;
1270 }
1271 nilfs_sc_cstage_inc(sci);
1272 fallthrough;
1273 case NILFS_ST_SR:
1274 if (mode == SC_LSEG_SR) {
1275 /* Appending a super root */
1276 err = nilfs_segctor_add_super_root(sci);
1277 if (unlikely(err))
1278 break;
1279 }
1280 /* End of a logical segment */
1281 sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND;
1282 nilfs_sc_cstage_set(sci, NILFS_ST_DONE);
1283 return 0;
1284 case NILFS_ST_DSYNC:
1285 dsync_mode:
1286 sci->sc_curseg->sb_sum.flags |= NILFS_SS_SYNDT;
1287 ii = sci->sc_dsync_inode;
1288 if (!test_bit(NILFS_I_BUSY, &ii->i_state))
1289 break;
1290
1291 err = nilfs_segctor_scan_file_dsync(sci, &ii->vfs_inode);
1292 if (unlikely(err))
1293 break;
1294 sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND;
1295 nilfs_sc_cstage_set(sci, NILFS_ST_DONE);
1296 return 0;
1297 case NILFS_ST_DONE:
1298 return 0;
1299 default:
1300 BUG();
1301 }
1302
1303 break_or_fail:
1304 return err;
1305}
1306
1307/**
1308 * nilfs_segctor_begin_construction - setup segment buffer to make a new log
1309 * @sci: nilfs_sc_info
1310 * @nilfs: nilfs object
1311 */
1312static int nilfs_segctor_begin_construction(struct nilfs_sc_info *sci,
1313 struct the_nilfs *nilfs)
1314{
1315 struct nilfs_segment_buffer *segbuf, *prev;
1316 __u64 nextnum;
1317 int err, alloc = 0;
1318
1319 segbuf = nilfs_segbuf_new(sci->sc_super);
1320 if (unlikely(!segbuf))
1321 return -ENOMEM;
1322
1323 if (list_empty(&sci->sc_write_logs)) {
1324 nilfs_segbuf_map(segbuf, nilfs->ns_segnum,
1325 nilfs->ns_pseg_offset, nilfs);
1326 if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
1327 nilfs_shift_to_next_segment(nilfs);
1328 nilfs_segbuf_map(segbuf, nilfs->ns_segnum, 0, nilfs);
1329 }
1330
1331 segbuf->sb_sum.seg_seq = nilfs->ns_seg_seq;
1332 nextnum = nilfs->ns_nextnum;
1333
1334 if (nilfs->ns_segnum == nilfs->ns_nextnum)
1335 /* Start from the head of a new full segment */
1336 alloc++;
1337 } else {
1338 /* Continue logs */
1339 prev = NILFS_LAST_SEGBUF(&sci->sc_write_logs);
1340 nilfs_segbuf_map_cont(segbuf, prev);
1341 segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq;
1342 nextnum = prev->sb_nextnum;
1343
1344 if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
1345 nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs);
1346 segbuf->sb_sum.seg_seq++;
1347 alloc++;
1348 }
1349 }
1350
1351 err = nilfs_sufile_mark_dirty(nilfs->ns_sufile, segbuf->sb_segnum);
1352 if (err)
1353 goto failed;
1354
1355 if (alloc) {
1356 err = nilfs_sufile_alloc(nilfs->ns_sufile, &nextnum);
1357 if (err)
1358 goto failed;
1359 }
1360 nilfs_segbuf_set_next_segnum(segbuf, nextnum, nilfs);
1361
1362 BUG_ON(!list_empty(&sci->sc_segbufs));
1363 list_add_tail(&segbuf->sb_list, &sci->sc_segbufs);
1364 sci->sc_segbuf_nblocks = segbuf->sb_rest_blocks;
1365 return 0;
1366
1367 failed:
1368 nilfs_segbuf_free(segbuf);
1369 return err;
1370}
1371
1372static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci,
1373 struct the_nilfs *nilfs, int nadd)
1374{
1375 struct nilfs_segment_buffer *segbuf, *prev;
1376 struct inode *sufile = nilfs->ns_sufile;
1377 __u64 nextnextnum;
1378 LIST_HEAD(list);
1379 int err, ret, i;
1380
1381 prev = NILFS_LAST_SEGBUF(&sci->sc_segbufs);
1382 /*
1383 * Since the segment specified with nextnum might be allocated during
1384 * the previous construction, the buffer including its segusage may
1385 * not be dirty. The following call ensures that the buffer is dirty
1386 * and will pin the buffer on memory until the sufile is written.
1387 */
1388 err = nilfs_sufile_mark_dirty(sufile, prev->sb_nextnum);
1389 if (unlikely(err))
1390 return err;
1391
1392 for (i = 0; i < nadd; i++) {
1393 /* extend segment info */
1394 err = -ENOMEM;
1395 segbuf = nilfs_segbuf_new(sci->sc_super);
1396 if (unlikely(!segbuf))
1397 goto failed;
1398
1399 /* map this buffer to region of segment on-disk */
1400 nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs);
1401 sci->sc_segbuf_nblocks += segbuf->sb_rest_blocks;
1402
1403 /* allocate the next next full segment */
1404 err = nilfs_sufile_alloc(sufile, &nextnextnum);
1405 if (unlikely(err))
1406 goto failed_segbuf;
1407
1408 segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq + 1;
1409 nilfs_segbuf_set_next_segnum(segbuf, nextnextnum, nilfs);
1410
1411 list_add_tail(&segbuf->sb_list, &list);
1412 prev = segbuf;
1413 }
1414 list_splice_tail(&list, &sci->sc_segbufs);
1415 return 0;
1416
1417 failed_segbuf:
1418 nilfs_segbuf_free(segbuf);
1419 failed:
1420 list_for_each_entry(segbuf, &list, sb_list) {
1421 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1422 WARN_ON(ret); /* never fails */
1423 }
1424 nilfs_destroy_logs(&list);
1425 return err;
1426}
1427
1428static void nilfs_free_incomplete_logs(struct list_head *logs,
1429 struct the_nilfs *nilfs)
1430{
1431 struct nilfs_segment_buffer *segbuf, *prev;
1432 struct inode *sufile = nilfs->ns_sufile;
1433 int ret;
1434
1435 segbuf = NILFS_FIRST_SEGBUF(logs);
1436 if (nilfs->ns_nextnum != segbuf->sb_nextnum) {
1437 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1438 WARN_ON(ret); /* never fails */
1439 }
1440 if (atomic_read(&segbuf->sb_err)) {
1441 /* Case 1: The first segment failed */
1442 if (segbuf->sb_pseg_start != segbuf->sb_fseg_start)
1443 /*
1444 * Case 1a: Partial segment appended into an existing
1445 * segment
1446 */
1447 nilfs_terminate_segment(nilfs, segbuf->sb_fseg_start,
1448 segbuf->sb_fseg_end);
1449 else /* Case 1b: New full segment */
1450 set_nilfs_discontinued(nilfs);
1451 }
1452
1453 prev = segbuf;
1454 list_for_each_entry_continue(segbuf, logs, sb_list) {
1455 if (prev->sb_nextnum != segbuf->sb_nextnum) {
1456 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1457 WARN_ON(ret); /* never fails */
1458 }
1459 if (atomic_read(&segbuf->sb_err) &&
1460 segbuf->sb_segnum != nilfs->ns_nextnum)
1461 /* Case 2: extended segment (!= next) failed */
1462 nilfs_sufile_set_error(sufile, segbuf->sb_segnum);
1463 prev = segbuf;
1464 }
1465}
1466
1467static void nilfs_segctor_update_segusage(struct nilfs_sc_info *sci,
1468 struct inode *sufile)
1469{
1470 struct nilfs_segment_buffer *segbuf;
1471 unsigned long live_blocks;
1472 int ret;
1473
1474 list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
1475 live_blocks = segbuf->sb_sum.nblocks +
1476 (segbuf->sb_pseg_start - segbuf->sb_fseg_start);
1477 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1478 live_blocks,
1479 sci->sc_seg_ctime);
1480 WARN_ON(ret); /* always succeed because the segusage is dirty */
1481 }
1482}
1483
1484static void nilfs_cancel_segusage(struct list_head *logs, struct inode *sufile)
1485{
1486 struct nilfs_segment_buffer *segbuf;
1487 int ret;
1488
1489 segbuf = NILFS_FIRST_SEGBUF(logs);
1490 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1491 segbuf->sb_pseg_start -
1492 segbuf->sb_fseg_start, 0);
1493 WARN_ON(ret); /* always succeed because the segusage is dirty */
1494
1495 list_for_each_entry_continue(segbuf, logs, sb_list) {
1496 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1497 0, 0);
1498 WARN_ON(ret); /* always succeed */
1499 }
1500}
1501
1502static void nilfs_segctor_truncate_segments(struct nilfs_sc_info *sci,
1503 struct nilfs_segment_buffer *last,
1504 struct inode *sufile)
1505{
1506 struct nilfs_segment_buffer *segbuf = last;
1507 int ret;
1508
1509 list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) {
1510 sci->sc_segbuf_nblocks -= segbuf->sb_rest_blocks;
1511 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1512 WARN_ON(ret);
1513 }
1514 nilfs_truncate_logs(&sci->sc_segbufs, last);
1515}
1516
1517
1518static int nilfs_segctor_collect(struct nilfs_sc_info *sci,
1519 struct the_nilfs *nilfs, int mode)
1520{
1521 struct nilfs_cstage prev_stage = sci->sc_stage;
1522 int err, nadd = 1;
1523
1524 /* Collection retry loop */
1525 for (;;) {
1526 sci->sc_nblk_this_inc = 0;
1527 sci->sc_curseg = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
1528
1529 err = nilfs_segctor_reset_segment_buffer(sci);
1530 if (unlikely(err))
1531 goto failed;
1532
1533 err = nilfs_segctor_collect_blocks(sci, mode);
1534 sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
1535 if (!err)
1536 break;
1537
1538 if (unlikely(err != -E2BIG))
1539 goto failed;
1540
1541 /* The current segment is filled up */
1542 if (mode != SC_LSEG_SR ||
1543 nilfs_sc_cstage_get(sci) < NILFS_ST_CPFILE)
1544 break;
1545
1546 nilfs_clear_logs(&sci->sc_segbufs);
1547
1548 if (sci->sc_stage.flags & NILFS_CF_SUFREED) {
1549 err = nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1550 sci->sc_freesegs,
1551 sci->sc_nfreesegs,
1552 NULL);
1553 WARN_ON(err); /* do not happen */
1554 sci->sc_stage.flags &= ~NILFS_CF_SUFREED;
1555 }
1556
1557 err = nilfs_segctor_extend_segments(sci, nilfs, nadd);
1558 if (unlikely(err))
1559 return err;
1560
1561 nadd = min_t(int, nadd << 1, SC_MAX_SEGDELTA);
1562 sci->sc_stage = prev_stage;
1563 }
1564 nilfs_segctor_zeropad_segsum(sci);
1565 nilfs_segctor_truncate_segments(sci, sci->sc_curseg, nilfs->ns_sufile);
1566 return 0;
1567
1568 failed:
1569 return err;
1570}
1571
1572static void nilfs_list_replace_buffer(struct buffer_head *old_bh,
1573 struct buffer_head *new_bh)
1574{
1575 BUG_ON(!list_empty(&new_bh->b_assoc_buffers));
1576
1577 list_replace_init(&old_bh->b_assoc_buffers, &new_bh->b_assoc_buffers);
1578 /* The caller must release old_bh */
1579}
1580
1581static int
1582nilfs_segctor_update_payload_blocknr(struct nilfs_sc_info *sci,
1583 struct nilfs_segment_buffer *segbuf,
1584 int mode)
1585{
1586 struct inode *inode = NULL;
1587 sector_t blocknr;
1588 unsigned long nfinfo = segbuf->sb_sum.nfinfo;
1589 unsigned long nblocks = 0, ndatablk = 0;
1590 const struct nilfs_sc_operations *sc_op = NULL;
1591 struct nilfs_segsum_pointer ssp;
1592 struct nilfs_finfo *finfo = NULL;
1593 union nilfs_binfo binfo;
1594 struct buffer_head *bh, *bh_org;
1595 ino_t ino = 0;
1596 int err = 0;
1597
1598 if (!nfinfo)
1599 goto out;
1600
1601 blocknr = segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk;
1602 ssp.bh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers);
1603 ssp.offset = sizeof(struct nilfs_segment_summary);
1604
1605 list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
1606 if (bh == segbuf->sb_super_root)
1607 break;
1608 if (!finfo) {
1609 finfo = nilfs_segctor_map_segsum_entry(
1610 sci, &ssp, sizeof(*finfo));
1611 ino = le64_to_cpu(finfo->fi_ino);
1612 nblocks = le32_to_cpu(finfo->fi_nblocks);
1613 ndatablk = le32_to_cpu(finfo->fi_ndatablk);
1614
1615 inode = bh->b_folio->mapping->host;
1616
1617 if (mode == SC_LSEG_DSYNC)
1618 sc_op = &nilfs_sc_dsync_ops;
1619 else if (ino == NILFS_DAT_INO)
1620 sc_op = &nilfs_sc_dat_ops;
1621 else /* file blocks */
1622 sc_op = &nilfs_sc_file_ops;
1623 }
1624 bh_org = bh;
1625 get_bh(bh_org);
1626 err = nilfs_bmap_assign(NILFS_I(inode)->i_bmap, &bh, blocknr,
1627 &binfo);
1628 if (bh != bh_org)
1629 nilfs_list_replace_buffer(bh_org, bh);
1630 brelse(bh_org);
1631 if (unlikely(err))
1632 goto failed_bmap;
1633
1634 if (ndatablk > 0)
1635 sc_op->write_data_binfo(sci, &ssp, &binfo);
1636 else
1637 sc_op->write_node_binfo(sci, &ssp, &binfo);
1638
1639 blocknr++;
1640 if (--nblocks == 0) {
1641 finfo = NULL;
1642 if (--nfinfo == 0)
1643 break;
1644 } else if (ndatablk > 0)
1645 ndatablk--;
1646 }
1647 out:
1648 return 0;
1649
1650 failed_bmap:
1651 return err;
1652}
1653
1654static int nilfs_segctor_assign(struct nilfs_sc_info *sci, int mode)
1655{
1656 struct nilfs_segment_buffer *segbuf;
1657 int err;
1658
1659 list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
1660 err = nilfs_segctor_update_payload_blocknr(sci, segbuf, mode);
1661 if (unlikely(err))
1662 return err;
1663 nilfs_segbuf_fill_in_segsum(segbuf);
1664 }
1665 return 0;
1666}
1667
1668static void nilfs_begin_folio_io(struct folio *folio)
1669{
1670 if (!folio || folio_test_writeback(folio))
1671 /*
1672 * For split b-tree node pages, this function may be called
1673 * twice. We ignore the 2nd or later calls by this check.
1674 */
1675 return;
1676
1677 folio_lock(folio);
1678 folio_clear_dirty_for_io(folio);
1679 folio_start_writeback(folio);
1680 folio_unlock(folio);
1681}
1682
1683static void nilfs_segctor_prepare_write(struct nilfs_sc_info *sci)
1684{
1685 struct nilfs_segment_buffer *segbuf;
1686 struct folio *bd_folio = NULL, *fs_folio = NULL;
1687
1688 list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
1689 struct buffer_head *bh;
1690
1691 list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
1692 b_assoc_buffers) {
1693 if (bh->b_folio != bd_folio) {
1694 if (bd_folio) {
1695 folio_lock(bd_folio);
1696 folio_clear_dirty_for_io(bd_folio);
1697 folio_start_writeback(bd_folio);
1698 folio_unlock(bd_folio);
1699 }
1700 bd_folio = bh->b_folio;
1701 }
1702 }
1703
1704 list_for_each_entry(bh, &segbuf->sb_payload_buffers,
1705 b_assoc_buffers) {
1706 if (bh == segbuf->sb_super_root) {
1707 if (bh->b_folio != bd_folio) {
1708 folio_lock(bd_folio);
1709 folio_clear_dirty_for_io(bd_folio);
1710 folio_start_writeback(bd_folio);
1711 folio_unlock(bd_folio);
1712 bd_folio = bh->b_folio;
1713 }
1714 break;
1715 }
1716 set_buffer_async_write(bh);
1717 if (bh->b_folio != fs_folio) {
1718 nilfs_begin_folio_io(fs_folio);
1719 fs_folio = bh->b_folio;
1720 }
1721 }
1722 }
1723 if (bd_folio) {
1724 folio_lock(bd_folio);
1725 folio_clear_dirty_for_io(bd_folio);
1726 folio_start_writeback(bd_folio);
1727 folio_unlock(bd_folio);
1728 }
1729 nilfs_begin_folio_io(fs_folio);
1730}
1731
1732static int nilfs_segctor_write(struct nilfs_sc_info *sci,
1733 struct the_nilfs *nilfs)
1734{
1735 int ret;
1736
1737 ret = nilfs_write_logs(&sci->sc_segbufs, nilfs);
1738 list_splice_tail_init(&sci->sc_segbufs, &sci->sc_write_logs);
1739 return ret;
1740}
1741
1742static void nilfs_end_folio_io(struct folio *folio, int err)
1743{
1744 if (!folio)
1745 return;
1746
1747 if (buffer_nilfs_node(folio_buffers(folio)) &&
1748 !folio_test_writeback(folio)) {
1749 /*
1750 * For b-tree node pages, this function may be called twice
1751 * or more because they might be split in a segment.
1752 */
1753 if (folio_test_dirty(folio)) {
1754 /*
1755 * For pages holding split b-tree node buffers, dirty
1756 * flag on the buffers may be cleared discretely.
1757 * In that case, the page is once redirtied for
1758 * remaining buffers, and it must be cancelled if
1759 * all the buffers get cleaned later.
1760 */
1761 folio_lock(folio);
1762 if (nilfs_folio_buffers_clean(folio))
1763 __nilfs_clear_folio_dirty(folio);
1764 folio_unlock(folio);
1765 }
1766 return;
1767 }
1768
1769 if (!err) {
1770 if (!nilfs_folio_buffers_clean(folio))
1771 filemap_dirty_folio(folio->mapping, folio);
1772 folio_clear_error(folio);
1773 } else {
1774 filemap_dirty_folio(folio->mapping, folio);
1775 folio_set_error(folio);
1776 }
1777
1778 folio_end_writeback(folio);
1779}
1780
1781static void nilfs_abort_logs(struct list_head *logs, int err)
1782{
1783 struct nilfs_segment_buffer *segbuf;
1784 struct folio *bd_folio = NULL, *fs_folio = NULL;
1785 struct buffer_head *bh;
1786
1787 if (list_empty(logs))
1788 return;
1789
1790 list_for_each_entry(segbuf, logs, sb_list) {
1791 list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
1792 b_assoc_buffers) {
1793 clear_buffer_uptodate(bh);
1794 if (bh->b_folio != bd_folio) {
1795 if (bd_folio)
1796 folio_end_writeback(bd_folio);
1797 bd_folio = bh->b_folio;
1798 }
1799 }
1800
1801 list_for_each_entry(bh, &segbuf->sb_payload_buffers,
1802 b_assoc_buffers) {
1803 if (bh == segbuf->sb_super_root) {
1804 clear_buffer_uptodate(bh);
1805 if (bh->b_folio != bd_folio) {
1806 folio_end_writeback(bd_folio);
1807 bd_folio = bh->b_folio;
1808 }
1809 break;
1810 }
1811 clear_buffer_async_write(bh);
1812 if (bh->b_folio != fs_folio) {
1813 nilfs_end_folio_io(fs_folio, err);
1814 fs_folio = bh->b_folio;
1815 }
1816 }
1817 }
1818 if (bd_folio)
1819 folio_end_writeback(bd_folio);
1820
1821 nilfs_end_folio_io(fs_folio, err);
1822}
1823
1824static void nilfs_segctor_abort_construction(struct nilfs_sc_info *sci,
1825 struct the_nilfs *nilfs, int err)
1826{
1827 LIST_HEAD(logs);
1828 int ret;
1829
1830 list_splice_tail_init(&sci->sc_write_logs, &logs);
1831 ret = nilfs_wait_on_logs(&logs);
1832 nilfs_abort_logs(&logs, ret ? : err);
1833
1834 list_splice_tail_init(&sci->sc_segbufs, &logs);
1835 nilfs_cancel_segusage(&logs, nilfs->ns_sufile);
1836 nilfs_free_incomplete_logs(&logs, nilfs);
1837
1838 if (sci->sc_stage.flags & NILFS_CF_SUFREED) {
1839 ret = nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1840 sci->sc_freesegs,
1841 sci->sc_nfreesegs,
1842 NULL);
1843 WARN_ON(ret); /* do not happen */
1844 }
1845
1846 nilfs_destroy_logs(&logs);
1847}
1848
1849static void nilfs_set_next_segment(struct the_nilfs *nilfs,
1850 struct nilfs_segment_buffer *segbuf)
1851{
1852 nilfs->ns_segnum = segbuf->sb_segnum;
1853 nilfs->ns_nextnum = segbuf->sb_nextnum;
1854 nilfs->ns_pseg_offset = segbuf->sb_pseg_start - segbuf->sb_fseg_start
1855 + segbuf->sb_sum.nblocks;
1856 nilfs->ns_seg_seq = segbuf->sb_sum.seg_seq;
1857 nilfs->ns_ctime = segbuf->sb_sum.ctime;
1858}
1859
1860static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
1861{
1862 struct nilfs_segment_buffer *segbuf;
1863 struct folio *bd_folio = NULL, *fs_folio = NULL;
1864 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
1865 int update_sr = false;
1866
1867 list_for_each_entry(segbuf, &sci->sc_write_logs, sb_list) {
1868 struct buffer_head *bh;
1869
1870 list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
1871 b_assoc_buffers) {
1872 set_buffer_uptodate(bh);
1873 clear_buffer_dirty(bh);
1874 if (bh->b_folio != bd_folio) {
1875 if (bd_folio)
1876 folio_end_writeback(bd_folio);
1877 bd_folio = bh->b_folio;
1878 }
1879 }
1880 /*
1881 * We assume that the buffers which belong to the same folio
1882 * continue over the buffer list.
1883 * Under this assumption, the last BHs of folios is
1884 * identifiable by the discontinuity of bh->b_folio
1885 * (folio != fs_folio).
1886 *
1887 * For B-tree node blocks, however, this assumption is not
1888 * guaranteed. The cleanup code of B-tree node folios needs
1889 * special care.
1890 */
1891 list_for_each_entry(bh, &segbuf->sb_payload_buffers,
1892 b_assoc_buffers) {
1893 const unsigned long set_bits = BIT(BH_Uptodate);
1894 const unsigned long clear_bits =
1895 (BIT(BH_Dirty) | BIT(BH_Async_Write) |
1896 BIT(BH_Delay) | BIT(BH_NILFS_Volatile) |
1897 BIT(BH_NILFS_Redirected));
1898
1899 if (bh == segbuf->sb_super_root) {
1900 set_buffer_uptodate(bh);
1901 clear_buffer_dirty(bh);
1902 if (bh->b_folio != bd_folio) {
1903 folio_end_writeback(bd_folio);
1904 bd_folio = bh->b_folio;
1905 }
1906 update_sr = true;
1907 break;
1908 }
1909 set_mask_bits(&bh->b_state, clear_bits, set_bits);
1910 if (bh->b_folio != fs_folio) {
1911 nilfs_end_folio_io(fs_folio, 0);
1912 fs_folio = bh->b_folio;
1913 }
1914 }
1915
1916 if (!nilfs_segbuf_simplex(segbuf)) {
1917 if (segbuf->sb_sum.flags & NILFS_SS_LOGBGN) {
1918 set_bit(NILFS_SC_UNCLOSED, &sci->sc_flags);
1919 sci->sc_lseg_stime = jiffies;
1920 }
1921 if (segbuf->sb_sum.flags & NILFS_SS_LOGEND)
1922 clear_bit(NILFS_SC_UNCLOSED, &sci->sc_flags);
1923 }
1924 }
1925 /*
1926 * Since folios may continue over multiple segment buffers,
1927 * end of the last folio must be checked outside of the loop.
1928 */
1929 if (bd_folio)
1930 folio_end_writeback(bd_folio);
1931
1932 nilfs_end_folio_io(fs_folio, 0);
1933
1934 nilfs_drop_collected_inodes(&sci->sc_dirty_files);
1935
1936 if (nilfs_doing_gc())
1937 nilfs_drop_collected_inodes(&sci->sc_gc_inodes);
1938 else
1939 nilfs->ns_nongc_ctime = sci->sc_seg_ctime;
1940
1941 sci->sc_nblk_inc += sci->sc_nblk_this_inc;
1942
1943 segbuf = NILFS_LAST_SEGBUF(&sci->sc_write_logs);
1944 nilfs_set_next_segment(nilfs, segbuf);
1945
1946 if (update_sr) {
1947 nilfs->ns_flushed_device = 0;
1948 nilfs_set_last_segment(nilfs, segbuf->sb_pseg_start,
1949 segbuf->sb_sum.seg_seq, nilfs->ns_cno++);
1950
1951 clear_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
1952 clear_bit(NILFS_SC_DIRTY, &sci->sc_flags);
1953 set_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags);
1954 nilfs_segctor_clear_metadata_dirty(sci);
1955 } else
1956 clear_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags);
1957}
1958
1959static int nilfs_segctor_wait(struct nilfs_sc_info *sci)
1960{
1961 int ret;
1962
1963 ret = nilfs_wait_on_logs(&sci->sc_write_logs);
1964 if (!ret) {
1965 nilfs_segctor_complete_write(sci);
1966 nilfs_destroy_logs(&sci->sc_write_logs);
1967 }
1968 return ret;
1969}
1970
1971static int nilfs_segctor_collect_dirty_files(struct nilfs_sc_info *sci,
1972 struct the_nilfs *nilfs)
1973{
1974 struct nilfs_inode_info *ii, *n;
1975 struct inode *ifile = sci->sc_root->ifile;
1976
1977 spin_lock(&nilfs->ns_inode_lock);
1978 retry:
1979 list_for_each_entry_safe(ii, n, &nilfs->ns_dirty_files, i_dirty) {
1980 if (!ii->i_bh) {
1981 struct buffer_head *ibh;
1982 int err;
1983
1984 spin_unlock(&nilfs->ns_inode_lock);
1985 err = nilfs_ifile_get_inode_block(
1986 ifile, ii->vfs_inode.i_ino, &ibh);
1987 if (unlikely(err)) {
1988 nilfs_warn(sci->sc_super,
1989 "log writer: error %d getting inode block (ino=%lu)",
1990 err, ii->vfs_inode.i_ino);
1991 return err;
1992 }
1993 spin_lock(&nilfs->ns_inode_lock);
1994 if (likely(!ii->i_bh))
1995 ii->i_bh = ibh;
1996 else
1997 brelse(ibh);
1998 goto retry;
1999 }
2000
2001 // Always redirty the buffer to avoid race condition
2002 mark_buffer_dirty(ii->i_bh);
2003 nilfs_mdt_mark_dirty(ifile);
2004
2005 clear_bit(NILFS_I_QUEUED, &ii->i_state);
2006 set_bit(NILFS_I_BUSY, &ii->i_state);
2007 list_move_tail(&ii->i_dirty, &sci->sc_dirty_files);
2008 }
2009 spin_unlock(&nilfs->ns_inode_lock);
2010
2011 return 0;
2012}
2013
2014static void nilfs_segctor_drop_written_files(struct nilfs_sc_info *sci,
2015 struct the_nilfs *nilfs)
2016{
2017 struct nilfs_inode_info *ii, *n;
2018 int during_mount = !(sci->sc_super->s_flags & SB_ACTIVE);
2019 int defer_iput = false;
2020
2021 spin_lock(&nilfs->ns_inode_lock);
2022 list_for_each_entry_safe(ii, n, &sci->sc_dirty_files, i_dirty) {
2023 if (!test_and_clear_bit(NILFS_I_UPDATED, &ii->i_state) ||
2024 test_bit(NILFS_I_DIRTY, &ii->i_state))
2025 continue;
2026
2027 clear_bit(NILFS_I_BUSY, &ii->i_state);
2028 brelse(ii->i_bh);
2029 ii->i_bh = NULL;
2030 list_del_init(&ii->i_dirty);
2031 if (!ii->vfs_inode.i_nlink || during_mount) {
2032 /*
2033 * Defer calling iput() to avoid deadlocks if
2034 * i_nlink == 0 or mount is not yet finished.
2035 */
2036 list_add_tail(&ii->i_dirty, &sci->sc_iput_queue);
2037 defer_iput = true;
2038 } else {
2039 spin_unlock(&nilfs->ns_inode_lock);
2040 iput(&ii->vfs_inode);
2041 spin_lock(&nilfs->ns_inode_lock);
2042 }
2043 }
2044 spin_unlock(&nilfs->ns_inode_lock);
2045
2046 if (defer_iput)
2047 schedule_work(&sci->sc_iput_work);
2048}
2049
2050/*
2051 * Main procedure of segment constructor
2052 */
2053static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
2054{
2055 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
2056 int err;
2057
2058 if (sb_rdonly(sci->sc_super))
2059 return -EROFS;
2060
2061 nilfs_sc_cstage_set(sci, NILFS_ST_INIT);
2062 sci->sc_cno = nilfs->ns_cno;
2063
2064 err = nilfs_segctor_collect_dirty_files(sci, nilfs);
2065 if (unlikely(err))
2066 goto out;
2067
2068 if (nilfs_test_metadata_dirty(nilfs, sci->sc_root))
2069 set_bit(NILFS_SC_DIRTY, &sci->sc_flags);
2070
2071 if (nilfs_segctor_clean(sci))
2072 goto out;
2073
2074 do {
2075 sci->sc_stage.flags &= ~NILFS_CF_HISTORY_MASK;
2076
2077 err = nilfs_segctor_begin_construction(sci, nilfs);
2078 if (unlikely(err))
2079 goto out;
2080
2081 /* Update time stamp */
2082 sci->sc_seg_ctime = ktime_get_real_seconds();
2083
2084 err = nilfs_segctor_collect(sci, nilfs, mode);
2085 if (unlikely(err))
2086 goto failed;
2087
2088 /* Avoid empty segment */
2089 if (nilfs_sc_cstage_get(sci) == NILFS_ST_DONE &&
2090 nilfs_segbuf_empty(sci->sc_curseg)) {
2091 nilfs_segctor_abort_construction(sci, nilfs, 1);
2092 goto out;
2093 }
2094
2095 err = nilfs_segctor_assign(sci, mode);
2096 if (unlikely(err))
2097 goto failed;
2098
2099 if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
2100 nilfs_segctor_fill_in_file_bmap(sci);
2101
2102 if (mode == SC_LSEG_SR &&
2103 nilfs_sc_cstage_get(sci) >= NILFS_ST_CPFILE) {
2104 err = nilfs_segctor_fill_in_checkpoint(sci);
2105 if (unlikely(err))
2106 goto failed_to_write;
2107
2108 nilfs_segctor_fill_in_super_root(sci, nilfs);
2109 }
2110 nilfs_segctor_update_segusage(sci, nilfs->ns_sufile);
2111
2112 /* Write partial segments */
2113 nilfs_segctor_prepare_write(sci);
2114
2115 nilfs_add_checksums_on_logs(&sci->sc_segbufs,
2116 nilfs->ns_crc_seed);
2117
2118 err = nilfs_segctor_write(sci, nilfs);
2119 if (unlikely(err))
2120 goto failed_to_write;
2121
2122 if (nilfs_sc_cstage_get(sci) == NILFS_ST_DONE ||
2123 nilfs->ns_blocksize_bits != PAGE_SHIFT) {
2124 /*
2125 * At this point, we avoid double buffering
2126 * for blocksize < pagesize because page dirty
2127 * flag is turned off during write and dirty
2128 * buffers are not properly collected for
2129 * pages crossing over segments.
2130 */
2131 err = nilfs_segctor_wait(sci);
2132 if (err)
2133 goto failed_to_write;
2134 }
2135 } while (nilfs_sc_cstage_get(sci) != NILFS_ST_DONE);
2136
2137 out:
2138 nilfs_segctor_drop_written_files(sci, nilfs);
2139 return err;
2140
2141 failed_to_write:
2142 if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
2143 nilfs_redirty_inodes(&sci->sc_dirty_files);
2144
2145 failed:
2146 if (nilfs_doing_gc())
2147 nilfs_redirty_inodes(&sci->sc_gc_inodes);
2148 nilfs_segctor_abort_construction(sci, nilfs, err);
2149 goto out;
2150}
2151
2152/**
2153 * nilfs_segctor_start_timer - set timer of background write
2154 * @sci: nilfs_sc_info
2155 *
2156 * If the timer has already been set, it ignores the new request.
2157 * This function MUST be called within a section locking the segment
2158 * semaphore.
2159 */
2160static void nilfs_segctor_start_timer(struct nilfs_sc_info *sci)
2161{
2162 spin_lock(&sci->sc_state_lock);
2163 if (!(sci->sc_state & NILFS_SEGCTOR_COMMIT)) {
2164 sci->sc_timer.expires = jiffies + sci->sc_interval;
2165 add_timer(&sci->sc_timer);
2166 sci->sc_state |= NILFS_SEGCTOR_COMMIT;
2167 }
2168 spin_unlock(&sci->sc_state_lock);
2169}
2170
2171static void nilfs_segctor_do_flush(struct nilfs_sc_info *sci, int bn)
2172{
2173 spin_lock(&sci->sc_state_lock);
2174 if (!(sci->sc_flush_request & BIT(bn))) {
2175 unsigned long prev_req = sci->sc_flush_request;
2176
2177 sci->sc_flush_request |= BIT(bn);
2178 if (!prev_req)
2179 wake_up(&sci->sc_wait_daemon);
2180 }
2181 spin_unlock(&sci->sc_state_lock);
2182}
2183
2184/**
2185 * nilfs_flush_segment - trigger a segment construction for resource control
2186 * @sb: super block
2187 * @ino: inode number of the file to be flushed out.
2188 */
2189void nilfs_flush_segment(struct super_block *sb, ino_t ino)
2190{
2191 struct the_nilfs *nilfs = sb->s_fs_info;
2192 struct nilfs_sc_info *sci = nilfs->ns_writer;
2193
2194 if (!sci || nilfs_doing_construction())
2195 return;
2196 nilfs_segctor_do_flush(sci, NILFS_MDT_INODE(sb, ino) ? ino : 0);
2197 /* assign bit 0 to data files */
2198}
2199
2200struct nilfs_segctor_wait_request {
2201 wait_queue_entry_t wq;
2202 __u32 seq;
2203 int err;
2204 atomic_t done;
2205};
2206
2207static int nilfs_segctor_sync(struct nilfs_sc_info *sci)
2208{
2209 struct nilfs_segctor_wait_request wait_req;
2210 int err = 0;
2211
2212 spin_lock(&sci->sc_state_lock);
2213 init_wait(&wait_req.wq);
2214 wait_req.err = 0;
2215 atomic_set(&wait_req.done, 0);
2216 wait_req.seq = ++sci->sc_seq_request;
2217 spin_unlock(&sci->sc_state_lock);
2218
2219 init_waitqueue_entry(&wait_req.wq, current);
2220 add_wait_queue(&sci->sc_wait_request, &wait_req.wq);
2221 set_current_state(TASK_INTERRUPTIBLE);
2222 wake_up(&sci->sc_wait_daemon);
2223
2224 for (;;) {
2225 if (atomic_read(&wait_req.done)) {
2226 err = wait_req.err;
2227 break;
2228 }
2229 if (!signal_pending(current)) {
2230 schedule();
2231 continue;
2232 }
2233 err = -ERESTARTSYS;
2234 break;
2235 }
2236 finish_wait(&sci->sc_wait_request, &wait_req.wq);
2237 return err;
2238}
2239
2240static void nilfs_segctor_wakeup(struct nilfs_sc_info *sci, int err)
2241{
2242 struct nilfs_segctor_wait_request *wrq, *n;
2243 unsigned long flags;
2244
2245 spin_lock_irqsave(&sci->sc_wait_request.lock, flags);
2246 list_for_each_entry_safe(wrq, n, &sci->sc_wait_request.head, wq.entry) {
2247 if (!atomic_read(&wrq->done) &&
2248 nilfs_cnt32_ge(sci->sc_seq_done, wrq->seq)) {
2249 wrq->err = err;
2250 atomic_set(&wrq->done, 1);
2251 }
2252 if (atomic_read(&wrq->done)) {
2253 wrq->wq.func(&wrq->wq,
2254 TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE,
2255 0, NULL);
2256 }
2257 }
2258 spin_unlock_irqrestore(&sci->sc_wait_request.lock, flags);
2259}
2260
2261/**
2262 * nilfs_construct_segment - construct a logical segment
2263 * @sb: super block
2264 *
2265 * Return Value: On success, 0 is returned. On errors, one of the following
2266 * negative error code is returned.
2267 *
2268 * %-EROFS - Read only filesystem.
2269 *
2270 * %-EIO - I/O error
2271 *
2272 * %-ENOSPC - No space left on device (only in a panic state).
2273 *
2274 * %-ERESTARTSYS - Interrupted.
2275 *
2276 * %-ENOMEM - Insufficient memory available.
2277 */
2278int nilfs_construct_segment(struct super_block *sb)
2279{
2280 struct the_nilfs *nilfs = sb->s_fs_info;
2281 struct nilfs_sc_info *sci = nilfs->ns_writer;
2282 struct nilfs_transaction_info *ti;
2283
2284 if (sb_rdonly(sb) || unlikely(!sci))
2285 return -EROFS;
2286
2287 /* A call inside transactions causes a deadlock. */
2288 BUG_ON((ti = current->journal_info) && ti->ti_magic == NILFS_TI_MAGIC);
2289
2290 return nilfs_segctor_sync(sci);
2291}
2292
2293/**
2294 * nilfs_construct_dsync_segment - construct a data-only logical segment
2295 * @sb: super block
2296 * @inode: inode whose data blocks should be written out
2297 * @start: start byte offset
2298 * @end: end byte offset (inclusive)
2299 *
2300 * Return Value: On success, 0 is returned. On errors, one of the following
2301 * negative error code is returned.
2302 *
2303 * %-EROFS - Read only filesystem.
2304 *
2305 * %-EIO - I/O error
2306 *
2307 * %-ENOSPC - No space left on device (only in a panic state).
2308 *
2309 * %-ERESTARTSYS - Interrupted.
2310 *
2311 * %-ENOMEM - Insufficient memory available.
2312 */
2313int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode,
2314 loff_t start, loff_t end)
2315{
2316 struct the_nilfs *nilfs = sb->s_fs_info;
2317 struct nilfs_sc_info *sci = nilfs->ns_writer;
2318 struct nilfs_inode_info *ii;
2319 struct nilfs_transaction_info ti;
2320 int err = 0;
2321
2322 if (sb_rdonly(sb) || unlikely(!sci))
2323 return -EROFS;
2324
2325 nilfs_transaction_lock(sb, &ti, 0);
2326
2327 ii = NILFS_I(inode);
2328 if (test_bit(NILFS_I_INODE_SYNC, &ii->i_state) ||
2329 nilfs_test_opt(nilfs, STRICT_ORDER) ||
2330 test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) ||
2331 nilfs_discontinued(nilfs)) {
2332 nilfs_transaction_unlock(sb);
2333 err = nilfs_segctor_sync(sci);
2334 return err;
2335 }
2336
2337 spin_lock(&nilfs->ns_inode_lock);
2338 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
2339 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
2340 spin_unlock(&nilfs->ns_inode_lock);
2341 nilfs_transaction_unlock(sb);
2342 return 0;
2343 }
2344 spin_unlock(&nilfs->ns_inode_lock);
2345 sci->sc_dsync_inode = ii;
2346 sci->sc_dsync_start = start;
2347 sci->sc_dsync_end = end;
2348
2349 err = nilfs_segctor_do_construct(sci, SC_LSEG_DSYNC);
2350 if (!err)
2351 nilfs->ns_flushed_device = 0;
2352
2353 nilfs_transaction_unlock(sb);
2354 return err;
2355}
2356
2357#define FLUSH_FILE_BIT (0x1) /* data file only */
2358#define FLUSH_DAT_BIT BIT(NILFS_DAT_INO) /* DAT only */
2359
2360/**
2361 * nilfs_segctor_accept - record accepted sequence count of log-write requests
2362 * @sci: segment constructor object
2363 */
2364static void nilfs_segctor_accept(struct nilfs_sc_info *sci)
2365{
2366 spin_lock(&sci->sc_state_lock);
2367 sci->sc_seq_accepted = sci->sc_seq_request;
2368 spin_unlock(&sci->sc_state_lock);
2369 del_timer_sync(&sci->sc_timer);
2370}
2371
2372/**
2373 * nilfs_segctor_notify - notify the result of request to caller threads
2374 * @sci: segment constructor object
2375 * @mode: mode of log forming
2376 * @err: error code to be notified
2377 */
2378static void nilfs_segctor_notify(struct nilfs_sc_info *sci, int mode, int err)
2379{
2380 /* Clear requests (even when the construction failed) */
2381 spin_lock(&sci->sc_state_lock);
2382
2383 if (mode == SC_LSEG_SR) {
2384 sci->sc_state &= ~NILFS_SEGCTOR_COMMIT;
2385 sci->sc_seq_done = sci->sc_seq_accepted;
2386 nilfs_segctor_wakeup(sci, err);
2387 sci->sc_flush_request = 0;
2388 } else {
2389 if (mode == SC_FLUSH_FILE)
2390 sci->sc_flush_request &= ~FLUSH_FILE_BIT;
2391 else if (mode == SC_FLUSH_DAT)
2392 sci->sc_flush_request &= ~FLUSH_DAT_BIT;
2393
2394 /* re-enable timer if checkpoint creation was not done */
2395 if ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
2396 time_before(jiffies, sci->sc_timer.expires))
2397 add_timer(&sci->sc_timer);
2398 }
2399 spin_unlock(&sci->sc_state_lock);
2400}
2401
2402/**
2403 * nilfs_segctor_construct - form logs and write them to disk
2404 * @sci: segment constructor object
2405 * @mode: mode of log forming
2406 */
2407static int nilfs_segctor_construct(struct nilfs_sc_info *sci, int mode)
2408{
2409 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
2410 struct nilfs_super_block **sbp;
2411 int err = 0;
2412
2413 nilfs_segctor_accept(sci);
2414
2415 if (nilfs_discontinued(nilfs))
2416 mode = SC_LSEG_SR;
2417 if (!nilfs_segctor_confirm(sci))
2418 err = nilfs_segctor_do_construct(sci, mode);
2419
2420 if (likely(!err)) {
2421 if (mode != SC_FLUSH_DAT)
2422 atomic_set(&nilfs->ns_ndirtyblks, 0);
2423 if (test_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags) &&
2424 nilfs_discontinued(nilfs)) {
2425 down_write(&nilfs->ns_sem);
2426 err = -EIO;
2427 sbp = nilfs_prepare_super(sci->sc_super,
2428 nilfs_sb_will_flip(nilfs));
2429 if (likely(sbp)) {
2430 nilfs_set_log_cursor(sbp[0], nilfs);
2431 err = nilfs_commit_super(sci->sc_super,
2432 NILFS_SB_COMMIT);
2433 }
2434 up_write(&nilfs->ns_sem);
2435 }
2436 }
2437
2438 nilfs_segctor_notify(sci, mode, err);
2439 return err;
2440}
2441
2442static void nilfs_construction_timeout(struct timer_list *t)
2443{
2444 struct nilfs_sc_info *sci = from_timer(sci, t, sc_timer);
2445
2446 wake_up_process(sci->sc_timer_task);
2447}
2448
2449static void
2450nilfs_remove_written_gcinodes(struct the_nilfs *nilfs, struct list_head *head)
2451{
2452 struct nilfs_inode_info *ii, *n;
2453
2454 list_for_each_entry_safe(ii, n, head, i_dirty) {
2455 if (!test_bit(NILFS_I_UPDATED, &ii->i_state))
2456 continue;
2457 list_del_init(&ii->i_dirty);
2458 truncate_inode_pages(&ii->vfs_inode.i_data, 0);
2459 nilfs_btnode_cache_clear(ii->i_assoc_inode->i_mapping);
2460 iput(&ii->vfs_inode);
2461 }
2462}
2463
2464int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv,
2465 void **kbufs)
2466{
2467 struct the_nilfs *nilfs = sb->s_fs_info;
2468 struct nilfs_sc_info *sci = nilfs->ns_writer;
2469 struct nilfs_transaction_info ti;
2470 int err;
2471
2472 if (unlikely(!sci))
2473 return -EROFS;
2474
2475 nilfs_transaction_lock(sb, &ti, 1);
2476
2477 err = nilfs_mdt_save_to_shadow_map(nilfs->ns_dat);
2478 if (unlikely(err))
2479 goto out_unlock;
2480
2481 err = nilfs_ioctl_prepare_clean_segments(nilfs, argv, kbufs);
2482 if (unlikely(err)) {
2483 nilfs_mdt_restore_from_shadow_map(nilfs->ns_dat);
2484 goto out_unlock;
2485 }
2486
2487 sci->sc_freesegs = kbufs[4];
2488 sci->sc_nfreesegs = argv[4].v_nmembs;
2489 list_splice_tail_init(&nilfs->ns_gc_inodes, &sci->sc_gc_inodes);
2490
2491 for (;;) {
2492 err = nilfs_segctor_construct(sci, SC_LSEG_SR);
2493 nilfs_remove_written_gcinodes(nilfs, &sci->sc_gc_inodes);
2494
2495 if (likely(!err))
2496 break;
2497
2498 nilfs_warn(sb, "error %d cleaning segments", err);
2499 set_current_state(TASK_INTERRUPTIBLE);
2500 schedule_timeout(sci->sc_interval);
2501 }
2502 if (nilfs_test_opt(nilfs, DISCARD)) {
2503 int ret = nilfs_discard_segments(nilfs, sci->sc_freesegs,
2504 sci->sc_nfreesegs);
2505 if (ret) {
2506 nilfs_warn(sb,
2507 "error %d on discard request, turning discards off for the device",
2508 ret);
2509 nilfs_clear_opt(nilfs, DISCARD);
2510 }
2511 }
2512
2513 out_unlock:
2514 sci->sc_freesegs = NULL;
2515 sci->sc_nfreesegs = 0;
2516 nilfs_mdt_clear_shadow_map(nilfs->ns_dat);
2517 nilfs_transaction_unlock(sb);
2518 return err;
2519}
2520
2521static void nilfs_segctor_thread_construct(struct nilfs_sc_info *sci, int mode)
2522{
2523 struct nilfs_transaction_info ti;
2524
2525 nilfs_transaction_lock(sci->sc_super, &ti, 0);
2526 nilfs_segctor_construct(sci, mode);
2527
2528 /*
2529 * Unclosed segment should be retried. We do this using sc_timer.
2530 * Timeout of sc_timer will invoke complete construction which leads
2531 * to close the current logical segment.
2532 */
2533 if (test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags))
2534 nilfs_segctor_start_timer(sci);
2535
2536 nilfs_transaction_unlock(sci->sc_super);
2537}
2538
2539static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *sci)
2540{
2541 int mode = 0;
2542
2543 spin_lock(&sci->sc_state_lock);
2544 mode = (sci->sc_flush_request & FLUSH_DAT_BIT) ?
2545 SC_FLUSH_DAT : SC_FLUSH_FILE;
2546 spin_unlock(&sci->sc_state_lock);
2547
2548 if (mode) {
2549 nilfs_segctor_do_construct(sci, mode);
2550
2551 spin_lock(&sci->sc_state_lock);
2552 sci->sc_flush_request &= (mode == SC_FLUSH_FILE) ?
2553 ~FLUSH_FILE_BIT : ~FLUSH_DAT_BIT;
2554 spin_unlock(&sci->sc_state_lock);
2555 }
2556 clear_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags);
2557}
2558
2559static int nilfs_segctor_flush_mode(struct nilfs_sc_info *sci)
2560{
2561 if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) ||
2562 time_before(jiffies, sci->sc_lseg_stime + sci->sc_mjcp_freq)) {
2563 if (!(sci->sc_flush_request & ~FLUSH_FILE_BIT))
2564 return SC_FLUSH_FILE;
2565 else if (!(sci->sc_flush_request & ~FLUSH_DAT_BIT))
2566 return SC_FLUSH_DAT;
2567 }
2568 return SC_LSEG_SR;
2569}
2570
2571/**
2572 * nilfs_segctor_thread - main loop of the segment constructor thread.
2573 * @arg: pointer to a struct nilfs_sc_info.
2574 *
2575 * nilfs_segctor_thread() initializes a timer and serves as a daemon
2576 * to execute segment constructions.
2577 */
2578static int nilfs_segctor_thread(void *arg)
2579{
2580 struct nilfs_sc_info *sci = (struct nilfs_sc_info *)arg;
2581 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
2582 int timeout = 0;
2583
2584 sci->sc_timer_task = current;
2585
2586 /* start sync. */
2587 sci->sc_task = current;
2588 wake_up(&sci->sc_wait_task); /* for nilfs_segctor_start_thread() */
2589 nilfs_info(sci->sc_super,
2590 "segctord starting. Construction interval = %lu seconds, CP frequency < %lu seconds",
2591 sci->sc_interval / HZ, sci->sc_mjcp_freq / HZ);
2592
2593 set_freezable();
2594 spin_lock(&sci->sc_state_lock);
2595 loop:
2596 for (;;) {
2597 int mode;
2598
2599 if (sci->sc_state & NILFS_SEGCTOR_QUIT)
2600 goto end_thread;
2601
2602 if (timeout || sci->sc_seq_request != sci->sc_seq_done)
2603 mode = SC_LSEG_SR;
2604 else if (sci->sc_flush_request)
2605 mode = nilfs_segctor_flush_mode(sci);
2606 else
2607 break;
2608
2609 spin_unlock(&sci->sc_state_lock);
2610 nilfs_segctor_thread_construct(sci, mode);
2611 spin_lock(&sci->sc_state_lock);
2612 timeout = 0;
2613 }
2614
2615
2616 if (freezing(current)) {
2617 spin_unlock(&sci->sc_state_lock);
2618 try_to_freeze();
2619 spin_lock(&sci->sc_state_lock);
2620 } else {
2621 DEFINE_WAIT(wait);
2622 int should_sleep = 1;
2623
2624 prepare_to_wait(&sci->sc_wait_daemon, &wait,
2625 TASK_INTERRUPTIBLE);
2626
2627 if (sci->sc_seq_request != sci->sc_seq_done)
2628 should_sleep = 0;
2629 else if (sci->sc_flush_request)
2630 should_sleep = 0;
2631 else if (sci->sc_state & NILFS_SEGCTOR_COMMIT)
2632 should_sleep = time_before(jiffies,
2633 sci->sc_timer.expires);
2634
2635 if (should_sleep) {
2636 spin_unlock(&sci->sc_state_lock);
2637 schedule();
2638 spin_lock(&sci->sc_state_lock);
2639 }
2640 finish_wait(&sci->sc_wait_daemon, &wait);
2641 timeout = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
2642 time_after_eq(jiffies, sci->sc_timer.expires));
2643
2644 if (nilfs_sb_dirty(nilfs) && nilfs_sb_need_update(nilfs))
2645 set_nilfs_discontinued(nilfs);
2646 }
2647 goto loop;
2648
2649 end_thread:
2650 /* end sync. */
2651 sci->sc_task = NULL;
2652 wake_up(&sci->sc_wait_task); /* for nilfs_segctor_kill_thread() */
2653 spin_unlock(&sci->sc_state_lock);
2654 return 0;
2655}
2656
2657static int nilfs_segctor_start_thread(struct nilfs_sc_info *sci)
2658{
2659 struct task_struct *t;
2660
2661 t = kthread_run(nilfs_segctor_thread, sci, "segctord");
2662 if (IS_ERR(t)) {
2663 int err = PTR_ERR(t);
2664
2665 nilfs_err(sci->sc_super, "error %d creating segctord thread",
2666 err);
2667 return err;
2668 }
2669 wait_event(sci->sc_wait_task, sci->sc_task != NULL);
2670 return 0;
2671}
2672
2673static void nilfs_segctor_kill_thread(struct nilfs_sc_info *sci)
2674 __acquires(&sci->sc_state_lock)
2675 __releases(&sci->sc_state_lock)
2676{
2677 sci->sc_state |= NILFS_SEGCTOR_QUIT;
2678
2679 while (sci->sc_task) {
2680 wake_up(&sci->sc_wait_daemon);
2681 spin_unlock(&sci->sc_state_lock);
2682 wait_event(sci->sc_wait_task, sci->sc_task == NULL);
2683 spin_lock(&sci->sc_state_lock);
2684 }
2685}
2686
2687/*
2688 * Setup & clean-up functions
2689 */
2690static struct nilfs_sc_info *nilfs_segctor_new(struct super_block *sb,
2691 struct nilfs_root *root)
2692{
2693 struct the_nilfs *nilfs = sb->s_fs_info;
2694 struct nilfs_sc_info *sci;
2695
2696 sci = kzalloc(sizeof(*sci), GFP_KERNEL);
2697 if (!sci)
2698 return NULL;
2699
2700 sci->sc_super = sb;
2701
2702 nilfs_get_root(root);
2703 sci->sc_root = root;
2704
2705 init_waitqueue_head(&sci->sc_wait_request);
2706 init_waitqueue_head(&sci->sc_wait_daemon);
2707 init_waitqueue_head(&sci->sc_wait_task);
2708 spin_lock_init(&sci->sc_state_lock);
2709 INIT_LIST_HEAD(&sci->sc_dirty_files);
2710 INIT_LIST_HEAD(&sci->sc_segbufs);
2711 INIT_LIST_HEAD(&sci->sc_write_logs);
2712 INIT_LIST_HEAD(&sci->sc_gc_inodes);
2713 INIT_LIST_HEAD(&sci->sc_iput_queue);
2714 INIT_WORK(&sci->sc_iput_work, nilfs_iput_work_func);
2715 timer_setup(&sci->sc_timer, nilfs_construction_timeout, 0);
2716
2717 sci->sc_interval = HZ * NILFS_SC_DEFAULT_TIMEOUT;
2718 sci->sc_mjcp_freq = HZ * NILFS_SC_DEFAULT_SR_FREQ;
2719 sci->sc_watermark = NILFS_SC_DEFAULT_WATERMARK;
2720
2721 if (nilfs->ns_interval)
2722 sci->sc_interval = HZ * nilfs->ns_interval;
2723 if (nilfs->ns_watermark)
2724 sci->sc_watermark = nilfs->ns_watermark;
2725 return sci;
2726}
2727
2728static void nilfs_segctor_write_out(struct nilfs_sc_info *sci)
2729{
2730 int ret, retrycount = NILFS_SC_CLEANUP_RETRY;
2731
2732 /*
2733 * The segctord thread was stopped and its timer was removed.
2734 * But some tasks remain.
2735 */
2736 do {
2737 struct nilfs_transaction_info ti;
2738
2739 nilfs_transaction_lock(sci->sc_super, &ti, 0);
2740 ret = nilfs_segctor_construct(sci, SC_LSEG_SR);
2741 nilfs_transaction_unlock(sci->sc_super);
2742
2743 flush_work(&sci->sc_iput_work);
2744
2745 } while (ret && ret != -EROFS && retrycount-- > 0);
2746}
2747
2748/**
2749 * nilfs_segctor_destroy - destroy the segment constructor.
2750 * @sci: nilfs_sc_info
2751 *
2752 * nilfs_segctor_destroy() kills the segctord thread and frees
2753 * the nilfs_sc_info struct.
2754 * Caller must hold the segment semaphore.
2755 */
2756static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
2757{
2758 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
2759 int flag;
2760
2761 up_write(&nilfs->ns_segctor_sem);
2762
2763 spin_lock(&sci->sc_state_lock);
2764 nilfs_segctor_kill_thread(sci);
2765 flag = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) || sci->sc_flush_request
2766 || sci->sc_seq_request != sci->sc_seq_done);
2767 spin_unlock(&sci->sc_state_lock);
2768
2769 if (flush_work(&sci->sc_iput_work))
2770 flag = true;
2771
2772 if (flag || !nilfs_segctor_confirm(sci))
2773 nilfs_segctor_write_out(sci);
2774
2775 if (!list_empty(&sci->sc_dirty_files)) {
2776 nilfs_warn(sci->sc_super,
2777 "disposed unprocessed dirty file(s) when stopping log writer");
2778 nilfs_dispose_list(nilfs, &sci->sc_dirty_files, 1);
2779 }
2780
2781 if (!list_empty(&sci->sc_iput_queue)) {
2782 nilfs_warn(sci->sc_super,
2783 "disposed unprocessed inode(s) in iput queue when stopping log writer");
2784 nilfs_dispose_list(nilfs, &sci->sc_iput_queue, 1);
2785 }
2786
2787 WARN_ON(!list_empty(&sci->sc_segbufs));
2788 WARN_ON(!list_empty(&sci->sc_write_logs));
2789
2790 nilfs_put_root(sci->sc_root);
2791
2792 down_write(&nilfs->ns_segctor_sem);
2793
2794 timer_shutdown_sync(&sci->sc_timer);
2795 kfree(sci);
2796}
2797
2798/**
2799 * nilfs_attach_log_writer - attach log writer
2800 * @sb: super block instance
2801 * @root: root object of the current filesystem tree
2802 *
2803 * This allocates a log writer object, initializes it, and starts the
2804 * log writer.
2805 *
2806 * Return Value: On success, 0 is returned. On error, one of the following
2807 * negative error code is returned.
2808 *
2809 * %-ENOMEM - Insufficient memory available.
2810 */
2811int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root)
2812{
2813 struct the_nilfs *nilfs = sb->s_fs_info;
2814 int err;
2815
2816 if (nilfs->ns_writer) {
2817 /*
2818 * This happens if the filesystem is made read-only by
2819 * __nilfs_error or nilfs_remount and then remounted
2820 * read/write. In these cases, reuse the existing
2821 * writer.
2822 */
2823 return 0;
2824 }
2825
2826 nilfs->ns_writer = nilfs_segctor_new(sb, root);
2827 if (!nilfs->ns_writer)
2828 return -ENOMEM;
2829
2830 inode_attach_wb(nilfs->ns_bdev->bd_inode, NULL);
2831
2832 err = nilfs_segctor_start_thread(nilfs->ns_writer);
2833 if (unlikely(err))
2834 nilfs_detach_log_writer(sb);
2835
2836 return err;
2837}
2838
2839/**
2840 * nilfs_detach_log_writer - destroy log writer
2841 * @sb: super block instance
2842 *
2843 * This kills log writer daemon, frees the log writer object, and
2844 * destroys list of dirty files.
2845 */
2846void nilfs_detach_log_writer(struct super_block *sb)
2847{
2848 struct the_nilfs *nilfs = sb->s_fs_info;
2849 LIST_HEAD(garbage_list);
2850
2851 down_write(&nilfs->ns_segctor_sem);
2852 if (nilfs->ns_writer) {
2853 nilfs_segctor_destroy(nilfs->ns_writer);
2854 nilfs->ns_writer = NULL;
2855 }
2856 set_nilfs_purging(nilfs);
2857
2858 /* Force to free the list of dirty files */
2859 spin_lock(&nilfs->ns_inode_lock);
2860 if (!list_empty(&nilfs->ns_dirty_files)) {
2861 list_splice_init(&nilfs->ns_dirty_files, &garbage_list);
2862 nilfs_warn(sb,
2863 "disposed unprocessed dirty file(s) when detaching log writer");
2864 }
2865 spin_unlock(&nilfs->ns_inode_lock);
2866 up_write(&nilfs->ns_segctor_sem);
2867
2868 nilfs_dispose_list(nilfs, &garbage_list, 1);
2869 clear_nilfs_purging(nilfs);
2870}