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nilfs2: super root size should change depending on inode size
[linux-2.6-block.git] / fs / nilfs2 / segment.c
CommitLineData
9ff05123
RK		 1/*
2 * segment.c - NILFS segment constructor.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Ryusuke Konishi <ryusuke@osrg.net>
21 *
22 */
23
24#include <linux/pagemap.h>
25#include <linux/buffer_head.h>
26#include <linux/writeback.h>
27#include <linux/bio.h>
28#include <linux/completion.h>
29#include <linux/blkdev.h>
30#include <linux/backing-dev.h>
31#include <linux/freezer.h>
32#include <linux/kthread.h>
33#include <linux/crc32.h>
34#include <linux/pagevec.h>
5a0e3ad6 35#include <linux/slab.h>
9ff05123
RK		 36#include "nilfs.h"
37#include "btnode.h"
38#include "page.h"
39#include "segment.h"
40#include "sufile.h"
41#include "cpfile.h"
42#include "ifile.h"
9ff05123
RK		 43#include "segbuf.h"
44
45
46/*
47 * Segment constructor
48 */
49#define SC_N_INODEVEC 16 /* Size of locally allocated inode vector */
50
51#define SC_MAX_SEGDELTA 64 /* Upper limit of the number of segments
52 appended in collection retry loop */
53
54/* Construction mode */
55enum {
56 SC_LSEG_SR = 1, /* Make a logical segment having a super root */
57 SC_LSEG_DSYNC, /* Flush data blocks of a given file and make
58 a logical segment without a super root */
59 SC_FLUSH_FILE, /* Flush data files, leads to segment writes without
60 creating a checkpoint */
61 SC_FLUSH_DAT, /* Flush DAT file. This also creates segments without
62 a checkpoint */
63};
64
65/* Stage numbers of dirty block collection */
66enum {
67 NILFS_ST_INIT = 0,
68 NILFS_ST_GC, /* Collecting dirty blocks for GC */
69 NILFS_ST_FILE,
9ff05123
RK		 70 NILFS_ST_IFILE,
71 NILFS_ST_CPFILE,
72 NILFS_ST_SUFILE,
73 NILFS_ST_DAT,
74 NILFS_ST_SR, /* Super root */
75 NILFS_ST_DSYNC, /* Data sync blocks */
76 NILFS_ST_DONE,
77};
78
79/* State flags of collection */
80#define NILFS_CF_NODE 0x0001 /* Collecting node blocks */
81#define NILFS_CF_IFILE_STARTED 0x0002 /* IFILE stage has started */
071cb4b8
RK		 82#define NILFS_CF_SUFREED 0x0004 /* segment usages has been freed */
83#define NILFS_CF_HISTORY_MASK (NILFS_CF_IFILE_STARTED | NILFS_CF_SUFREED)
9ff05123
RK		 84
85/* Operations depending on the construction mode and file type */
86struct nilfs_sc_operations {
87 int (*collect_data)(struct nilfs_sc_info *, struct buffer_head *,
88 struct inode *);
89 int (*collect_node)(struct nilfs_sc_info *, struct buffer_head *,
90 struct inode *);
91 int (*collect_bmap)(struct nilfs_sc_info *, struct buffer_head *,
92 struct inode *);
93 void (*write_data_binfo)(struct nilfs_sc_info *,
94 struct nilfs_segsum_pointer *,
95 union nilfs_binfo *);
96 void (*write_node_binfo)(struct nilfs_sc_info *,
97 struct nilfs_segsum_pointer *,
98 union nilfs_binfo *);
99};
100
101/*
102 * Other definitions
103 */
104static void nilfs_segctor_start_timer(struct nilfs_sc_info *);
105static void nilfs_segctor_do_flush(struct nilfs_sc_info *, int);
106static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *);
693dd321 107static void nilfs_dispose_list(struct the_nilfs *, struct list_head *, int);
9ff05123
RK		 108
109#define nilfs_cnt32_gt(a, b) \
110 (typecheck(__u32, a) && typecheck(__u32, b) && \
111 ((__s32)(b) - (__s32)(a) < 0))
112#define nilfs_cnt32_ge(a, b) \
113 (typecheck(__u32, a) && typecheck(__u32, b) && \
114 ((__s32)(a) - (__s32)(b) >= 0))
115#define nilfs_cnt32_lt(a, b) nilfs_cnt32_gt(b, a)
116#define nilfs_cnt32_le(a, b) nilfs_cnt32_ge(b, a)
117
9ff05123
RK		 118static int nilfs_prepare_segment_lock(struct nilfs_transaction_info *ti)
119{
120 struct nilfs_transaction_info *cur_ti = current->journal_info;
121 void *save = NULL;
122
123 if (cur_ti) {
124 if (cur_ti->ti_magic == NILFS_TI_MAGIC)
125 return ++cur_ti->ti_count;
126 else {
127 /*
128 * If journal_info field is occupied by other FS,
47420c79
RK		 129 * it is saved and will be restored on
130 * nilfs_transaction_commit().
9ff05123
RK		 131 */
132 printk(KERN_WARNING
133 "NILFS warning: journal info from a different "
134 "FS\n");
135 save = current->journal_info;
136 }
137 }
138 if (!ti) {
139 ti = kmem_cache_alloc(nilfs_transaction_cachep, GFP_NOFS);
140 if (!ti)
141 return -ENOMEM;
142 ti->ti_flags = NILFS_TI_DYNAMIC_ALLOC;
143 } else {
144 ti->ti_flags = 0;
145 }
146 ti->ti_count = 0;
147 ti->ti_save = save;
148 ti->ti_magic = NILFS_TI_MAGIC;
149 current->journal_info = ti;
150 return 0;
151}
152
153/**
154 * nilfs_transaction_begin - start indivisible file operations.
155 * @sb: super block
156 * @ti: nilfs_transaction_info
157 * @vacancy_check: flags for vacancy rate checks
158 *
159 * nilfs_transaction_begin() acquires a reader/writer semaphore, called
160 * the segment semaphore, to make a segment construction and write tasks
47420c79 161 * exclusive. The function is used with nilfs_transaction_commit() in pairs.
9ff05123
RK		 162 * The region enclosed by these two functions can be nested. To avoid a
163 * deadlock, the semaphore is only acquired or released in the outermost call.
164 *
165 * This function allocates a nilfs_transaction_info struct to keep context
166 * information on it. It is initialized and hooked onto the current task in
167 * the outermost call. If a pre-allocated struct is given to @ti, it is used
7a65004b 168 * instead; otherwise a new struct is assigned from a slab.
9ff05123
RK		 169 *
170 * When @vacancy_check flag is set, this function will check the amount of
171 * free space, and will wait for the GC to reclaim disk space if low capacity.
172 *
173 * Return Value: On success, 0 is returned. On error, one of the following
174 * negative error code is returned.
175 *
176 * %-ENOMEM - Insufficient memory available.
177 *
9ff05123
RK		 178 * %-ENOSPC - No space left on device
179 */
180int nilfs_transaction_begin(struct super_block *sb,
181 struct nilfs_transaction_info *ti,
182 int vacancy_check)
183{
9ff05123
RK		 184 struct the_nilfs *nilfs;
185 int ret = nilfs_prepare_segment_lock(ti);
186
187 if (unlikely(ret < 0))
188 return ret;
189 if (ret > 0)
190 return 0;
191
5beb6e0b
RK		 192 vfs_check_frozen(sb, SB_FREEZE_WRITE);
193
e3154e97 194 nilfs = sb->s_fs_info;
9ff05123
RK		 195 down_read(&nilfs->ns_segctor_sem);
196 if (vacancy_check && nilfs_near_disk_full(nilfs)) {
197 up_read(&nilfs->ns_segctor_sem);
198 ret = -ENOSPC;
199 goto failed;
200 }
201 return 0;
202
203 failed:
204 ti = current->journal_info;
205 current->journal_info = ti->ti_save;
206 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
207 kmem_cache_free(nilfs_transaction_cachep, ti);
208 return ret;
209}
210
211/**
47420c79 212 * nilfs_transaction_commit - commit indivisible file operations.
9ff05123 213 * @sb: super block
9ff05123 214 *
47420c79
RK		 215 * nilfs_transaction_commit() releases the read semaphore which is
216 * acquired by nilfs_transaction_begin(). This is only performed
217 * in outermost call of this function. If a commit flag is set,
218 * nilfs_transaction_commit() sets a timer to start the segment
219 * constructor. If a sync flag is set, it starts construction
220 * directly.
9ff05123 221 */
47420c79 222int nilfs_transaction_commit(struct super_block *sb)
9ff05123
RK		 223{
224 struct nilfs_transaction_info *ti = current->journal_info;
e3154e97 225 struct the_nilfs *nilfs = sb->s_fs_info;
9ff05123
RK		 226 int err = 0;
227
228 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
47420c79 229 ti->ti_flags |= NILFS_TI_COMMIT;
9ff05123
RK		 230 if (ti->ti_count > 0) {
231 ti->ti_count--;
232 return 0;
233 }
3fd3fe5a
RK		 234 if (nilfs->ns_writer) {
235 struct nilfs_sc_info *sci = nilfs->ns_writer;
236
9ff05123
RK		 237 if (ti->ti_flags & NILFS_TI_COMMIT)
238 nilfs_segctor_start_timer(sci);
3fd3fe5a 239 if (atomic_read(&nilfs->ns_ndirtyblks) > sci->sc_watermark)
9ff05123
RK		 240 nilfs_segctor_do_flush(sci, 0);
241 }
3fd3fe5a 242 up_read(&nilfs->ns_segctor_sem);
9ff05123
RK		 243 current->journal_info = ti->ti_save;
244
245 if (ti->ti_flags & NILFS_TI_SYNC)
246 err = nilfs_construct_segment(sb);
247 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
248 kmem_cache_free(nilfs_transaction_cachep, ti);
249 return err;
250}
251
47420c79
RK		 252void nilfs_transaction_abort(struct super_block *sb)
253{
254 struct nilfs_transaction_info *ti = current->journal_info;
e3154e97 255 struct the_nilfs *nilfs = sb->s_fs_info;
47420c79
RK		 256
257 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
258 if (ti->ti_count > 0) {
259 ti->ti_count--;
260 return;
261 }
e3154e97 262 up_read(&nilfs->ns_segctor_sem);
47420c79
RK		 263
264 current->journal_info = ti->ti_save;
265 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
266 kmem_cache_free(nilfs_transaction_cachep, ti);
267}
268
9ff05123
RK		 269void nilfs_relax_pressure_in_lock(struct super_block *sb)
270{
e3154e97 271 struct the_nilfs *nilfs = sb->s_fs_info;
3fd3fe5a 272 struct nilfs_sc_info *sci = nilfs->ns_writer;
9ff05123
RK		 273
274 if (!sci || !sci->sc_flush_request)
275 return;
276
277 set_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags);
278 up_read(&nilfs->ns_segctor_sem);
279
280 down_write(&nilfs->ns_segctor_sem);
281 if (sci->sc_flush_request &&
282 test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags)) {
283 struct nilfs_transaction_info *ti = current->journal_info;
284
285 ti->ti_flags |= NILFS_TI_WRITER;
286 nilfs_segctor_do_immediate_flush(sci);
287 ti->ti_flags &= ~NILFS_TI_WRITER;
288 }
289 downgrade_write(&nilfs->ns_segctor_sem);
290}
291
f7545144 292static void nilfs_transaction_lock(struct super_block *sb,
9ff05123
RK		 293 struct nilfs_transaction_info *ti,
294 int gcflag)
295{
296 struct nilfs_transaction_info *cur_ti = current->journal_info;
e3154e97 297 struct the_nilfs *nilfs = sb->s_fs_info;
3fd3fe5a 298 struct nilfs_sc_info *sci = nilfs->ns_writer;
9ff05123 299
1f5abe7e 300 WARN_ON(cur_ti);
9ff05123
RK		 301 ti->ti_flags = NILFS_TI_WRITER;
302 ti->ti_count = 0;
303 ti->ti_save = cur_ti;
304 ti->ti_magic = NILFS_TI_MAGIC;
305 INIT_LIST_HEAD(&ti->ti_garbage);
306 current->journal_info = ti;
307
308 for (;;) {
3fd3fe5a
RK		 309 down_write(&nilfs->ns_segctor_sem);
310 if (!test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags))
9ff05123
RK		 311 break;
312
3fd3fe5a 313 nilfs_segctor_do_immediate_flush(sci);
9ff05123 314
f7545144 315 up_write(&nilfs->ns_segctor_sem);
9ff05123
RK		 316 yield();
317 }
318 if (gcflag)
319 ti->ti_flags |= NILFS_TI_GC;
320}
321
f7545144 322static void nilfs_transaction_unlock(struct super_block *sb)
9ff05123
RK		 323{
324 struct nilfs_transaction_info *ti = current->journal_info;
e3154e97 325 struct the_nilfs *nilfs = sb->s_fs_info;
9ff05123
RK		 326
327 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
328 BUG_ON(ti->ti_count > 0);
329
693dd321 330 up_write(&nilfs->ns_segctor_sem);
9ff05123
RK		 331 current->journal_info = ti->ti_save;
332 if (!list_empty(&ti->ti_garbage))
693dd321 333 nilfs_dispose_list(nilfs, &ti->ti_garbage, 0);
9ff05123
RK		 334}
335
336static void *nilfs_segctor_map_segsum_entry(struct nilfs_sc_info *sci,
337 struct nilfs_segsum_pointer *ssp,
338 unsigned bytes)
339{
340 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
341 unsigned blocksize = sci->sc_super->s_blocksize;
342 void *p;
343
344 if (unlikely(ssp->offset + bytes > blocksize)) {
345 ssp->offset = 0;
346 BUG_ON(NILFS_SEGBUF_BH_IS_LAST(ssp->bh,
347 &segbuf->sb_segsum_buffers));
348 ssp->bh = NILFS_SEGBUF_NEXT_BH(ssp->bh);
349 }
350 p = ssp->bh->b_data + ssp->offset;
351 ssp->offset += bytes;
352 return p;
353}
354
355/**
356 * nilfs_segctor_reset_segment_buffer - reset the current segment buffer
357 * @sci: nilfs_sc_info
358 */
359static int nilfs_segctor_reset_segment_buffer(struct nilfs_sc_info *sci)
360{
361 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
362 struct buffer_head *sumbh;
363 unsigned sumbytes;
364 unsigned flags = 0;
365 int err;
366
367 if (nilfs_doing_gc())
368 flags = NILFS_SS_GC;
6c43f410 369 err = nilfs_segbuf_reset(segbuf, flags, sci->sc_seg_ctime, sci->sc_cno);
9ff05123
RK		 370 if (unlikely(err))
371 return err;
372
373 sumbh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers);
374 sumbytes = segbuf->sb_sum.sumbytes;
375 sci->sc_finfo_ptr.bh = sumbh; sci->sc_finfo_ptr.offset = sumbytes;
376 sci->sc_binfo_ptr.bh = sumbh; sci->sc_binfo_ptr.offset = sumbytes;
377 sci->sc_blk_cnt = sci->sc_datablk_cnt = 0;
378 return 0;
379}
380
381static int nilfs_segctor_feed_segment(struct nilfs_sc_info *sci)
382{
383 sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
384 if (NILFS_SEGBUF_IS_LAST(sci->sc_curseg, &sci->sc_segbufs))
385 return -E2BIG; /* The current segment is filled up
386 (internal code) */
387 sci->sc_curseg = NILFS_NEXT_SEGBUF(sci->sc_curseg);
388 return nilfs_segctor_reset_segment_buffer(sci);
389}
390
391static int nilfs_segctor_add_super_root(struct nilfs_sc_info *sci)
392{
393 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
394 int err;
395
396 if (segbuf->sb_sum.nblocks >= segbuf->sb_rest_blocks) {
397 err = nilfs_segctor_feed_segment(sci);
398 if (err)
399 return err;
400 segbuf = sci->sc_curseg;
401 }
1e2b68bf 402 err = nilfs_segbuf_extend_payload(segbuf, &segbuf->sb_super_root);
9ff05123
RK		 403 if (likely(!err))
404 segbuf->sb_sum.flags |= NILFS_SS_SR;
405 return err;
406}
407
408/*
409 * Functions for making segment summary and payloads
410 */
411static int nilfs_segctor_segsum_block_required(
412 struct nilfs_sc_info *sci, const struct nilfs_segsum_pointer *ssp,
413 unsigned binfo_size)
414{
415 unsigned blocksize = sci->sc_super->s_blocksize;
416 /* Size of finfo and binfo is enough small against blocksize */
417
418 return ssp->offset + binfo_size +
419 (!sci->sc_blk_cnt ? sizeof(struct nilfs_finfo) : 0) >
420 blocksize;
421}
422
423static void nilfs_segctor_begin_finfo(struct nilfs_sc_info *sci,
424 struct inode *inode)
425{
426 sci->sc_curseg->sb_sum.nfinfo++;
427 sci->sc_binfo_ptr = sci->sc_finfo_ptr;
428 nilfs_segctor_map_segsum_entry(
429 sci, &sci->sc_binfo_ptr, sizeof(struct nilfs_finfo));
c96fa464 430
72746ac6
RK		 431 if (NILFS_I(inode)->i_root &&
432 !test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags))
c96fa464 433 set_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
9ff05123
RK		 434 /* skip finfo */
435}
436
437static void nilfs_segctor_end_finfo(struct nilfs_sc_info *sci,
438 struct inode *inode)
439{
440 struct nilfs_finfo *finfo;
441 struct nilfs_inode_info *ii;
442 struct nilfs_segment_buffer *segbuf;
6c43f410 443 __u64 cno;
9ff05123
RK		 444
445 if (sci->sc_blk_cnt == 0)
446 return;
447
448 ii = NILFS_I(inode);
6c43f410
RK		 449
450 if (test_bit(NILFS_I_GCINODE, &ii->i_state))
451 cno = ii->i_cno;
452 else if (NILFS_ROOT_METADATA_FILE(inode->i_ino))
453 cno = 0;
454 else
455 cno = sci->sc_cno;
456
9ff05123
RK		 457 finfo = nilfs_segctor_map_segsum_entry(sci, &sci->sc_finfo_ptr,
458 sizeof(*finfo));
459 finfo->fi_ino = cpu_to_le64(inode->i_ino);
460 finfo->fi_nblocks = cpu_to_le32(sci->sc_blk_cnt);
461 finfo->fi_ndatablk = cpu_to_le32(sci->sc_datablk_cnt);
6c43f410 462 finfo->fi_cno = cpu_to_le64(cno);
9ff05123
RK		 463
464 segbuf = sci->sc_curseg;
465 segbuf->sb_sum.sumbytes = sci->sc_binfo_ptr.offset +
466 sci->sc_super->s_blocksize * (segbuf->sb_sum.nsumblk - 1);
467 sci->sc_finfo_ptr = sci->sc_binfo_ptr;
468 sci->sc_blk_cnt = sci->sc_datablk_cnt = 0;
469}
470
471static int nilfs_segctor_add_file_block(struct nilfs_sc_info *sci,
472 struct buffer_head *bh,
473 struct inode *inode,
474 unsigned binfo_size)
475{
476 struct nilfs_segment_buffer *segbuf;
477 int required, err = 0;
478
479 retry:
480 segbuf = sci->sc_curseg;
481 required = nilfs_segctor_segsum_block_required(
482 sci, &sci->sc_binfo_ptr, binfo_size);
483 if (segbuf->sb_sum.nblocks + required + 1 > segbuf->sb_rest_blocks) {
484 nilfs_segctor_end_finfo(sci, inode);
485 err = nilfs_segctor_feed_segment(sci);
486 if (err)
487 return err;
488 goto retry;
489 }
490 if (unlikely(required)) {
491 err = nilfs_segbuf_extend_segsum(segbuf);
492 if (unlikely(err))
493 goto failed;
494 }
495 if (sci->sc_blk_cnt == 0)
496 nilfs_segctor_begin_finfo(sci, inode);
497
498 nilfs_segctor_map_segsum_entry(sci, &sci->sc_binfo_ptr, binfo_size);
499 /* Substitution to vblocknr is delayed until update_blocknr() */
500 nilfs_segbuf_add_file_buffer(segbuf, bh);
501 sci->sc_blk_cnt++;
502 failed:
503 return err;
504}
505
9ff05123
RK		 506/*
507 * Callback functions that enumerate, mark, and collect dirty blocks
508 */
509static int nilfs_collect_file_data(struct nilfs_sc_info *sci,
510 struct buffer_head *bh, struct inode *inode)
511{
512 int err;
513
9ff05123 514 err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
e828949e
RK		 515 if (err < 0)
516 return err;
9ff05123
RK		 517
518 err = nilfs_segctor_add_file_block(sci, bh, inode,
519 sizeof(struct nilfs_binfo_v));
520 if (!err)
521 sci->sc_datablk_cnt++;
522 return err;
523}
524
525static int nilfs_collect_file_node(struct nilfs_sc_info *sci,
526 struct buffer_head *bh,
527 struct inode *inode)
528{
e828949e 529 return nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
9ff05123
RK		 530}
531
532static int nilfs_collect_file_bmap(struct nilfs_sc_info *sci,
533 struct buffer_head *bh,
534 struct inode *inode)
535{
1f5abe7e 536 WARN_ON(!buffer_dirty(bh));
9ff05123
RK		 537 return nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
538}
539
540static void nilfs_write_file_data_binfo(struct nilfs_sc_info *sci,
541 struct nilfs_segsum_pointer *ssp,
542 union nilfs_binfo *binfo)
543{
544 struct nilfs_binfo_v *binfo_v = nilfs_segctor_map_segsum_entry(
545 sci, ssp, sizeof(*binfo_v));
546 *binfo_v = binfo->bi_v;
547}
548
549static void nilfs_write_file_node_binfo(struct nilfs_sc_info *sci,
550 struct nilfs_segsum_pointer *ssp,
551 union nilfs_binfo *binfo)
552{
553 __le64 *vblocknr = nilfs_segctor_map_segsum_entry(
554 sci, ssp, sizeof(*vblocknr));
555 *vblocknr = binfo->bi_v.bi_vblocknr;
556}
557
4e819509 558static struct nilfs_sc_operations nilfs_sc_file_ops = {
9ff05123
RK		 559 .collect_data = nilfs_collect_file_data,
560 .collect_node = nilfs_collect_file_node,
561 .collect_bmap = nilfs_collect_file_bmap,
562 .write_data_binfo = nilfs_write_file_data_binfo,
563 .write_node_binfo = nilfs_write_file_node_binfo,
564};
565
566static int nilfs_collect_dat_data(struct nilfs_sc_info *sci,
567 struct buffer_head *bh, struct inode *inode)
568{
569 int err;
570
571 err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
e828949e
RK		 572 if (err < 0)
573 return err;
9ff05123
RK		 574
575 err = nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
576 if (!err)
577 sci->sc_datablk_cnt++;
578 return err;
579}
580
581static int nilfs_collect_dat_bmap(struct nilfs_sc_info *sci,
582 struct buffer_head *bh, struct inode *inode)
583{
1f5abe7e 584 WARN_ON(!buffer_dirty(bh));
9ff05123
RK		 585 return nilfs_segctor_add_file_block(sci, bh, inode,
586 sizeof(struct nilfs_binfo_dat));
587}
588
589static void nilfs_write_dat_data_binfo(struct nilfs_sc_info *sci,
590 struct nilfs_segsum_pointer *ssp,
591 union nilfs_binfo *binfo)
592{
593 __le64 *blkoff = nilfs_segctor_map_segsum_entry(sci, ssp,
594 sizeof(*blkoff));
595 *blkoff = binfo->bi_dat.bi_blkoff;
596}
597
598static void nilfs_write_dat_node_binfo(struct nilfs_sc_info *sci,
599 struct nilfs_segsum_pointer *ssp,
600 union nilfs_binfo *binfo)
601{
602 struct nilfs_binfo_dat *binfo_dat =
603 nilfs_segctor_map_segsum_entry(sci, ssp, sizeof(*binfo_dat));
604 *binfo_dat = binfo->bi_dat;
605}
606
4e819509 607static struct nilfs_sc_operations nilfs_sc_dat_ops = {
9ff05123
RK		 608 .collect_data = nilfs_collect_dat_data,
609 .collect_node = nilfs_collect_file_node,
610 .collect_bmap = nilfs_collect_dat_bmap,
611 .write_data_binfo = nilfs_write_dat_data_binfo,
612 .write_node_binfo = nilfs_write_dat_node_binfo,
613};
614
4e819509 615static struct nilfs_sc_operations nilfs_sc_dsync_ops = {
9ff05123
RK		 616 .collect_data = nilfs_collect_file_data,
617 .collect_node = NULL,
618 .collect_bmap = NULL,
619 .write_data_binfo = nilfs_write_file_data_binfo,
620 .write_node_binfo = NULL,
621};
622
f30bf3e4
RK		 623static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode,
624 struct list_head *listp,
625 size_t nlimit,
626 loff_t start, loff_t end)
9ff05123 627{
9ff05123
RK		 628 struct address_space *mapping = inode->i_mapping;
629 struct pagevec pvec;
f30bf3e4
RK		 630 pgoff_t index = 0, last = ULONG_MAX;
631 size_t ndirties = 0;
632 int i;
9ff05123 633
f30bf3e4
RK		 634 if (unlikely(start != 0 || end != LLONG_MAX)) {
635 /*
636 * A valid range is given for sync-ing data pages. The
637 * range is rounded to per-page; extra dirty buffers
638 * may be included if blocksize < pagesize.
639 */
640 index = start >> PAGE_SHIFT;
641 last = end >> PAGE_SHIFT;
642 }
9ff05123
RK		 643 pagevec_init(&pvec, 0);
644 repeat:
f30bf3e4
RK		 645 if (unlikely(index > last) ||
646 !pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY,
647 min_t(pgoff_t, last - index,
648 PAGEVEC_SIZE - 1) + 1))
649 return ndirties;
9ff05123
RK		 650
651 for (i = 0; i < pagevec_count(&pvec); i++) {
652 struct buffer_head *bh, *head;
653 struct page *page = pvec.pages[i];
654
f30bf3e4
RK		 655 if (unlikely(page->index > last))
656 break;
657
9ff05123
RK		 658 if (mapping->host) {
659 lock_page(page);
660 if (!page_has_buffers(page))
661 create_empty_buffers(page,
662 1 << inode->i_blkbits, 0);
663 unlock_page(page);
664 }
665
666 bh = head = page_buffers(page);
667 do {
f30bf3e4
RK		 668 if (!buffer_dirty(bh))
669 continue;
670 get_bh(bh);
671 list_add_tail(&bh->b_assoc_buffers, listp);
672 ndirties++;
673 if (unlikely(ndirties >= nlimit)) {
674 pagevec_release(&pvec);
675 cond_resched();
676 return ndirties;
9ff05123 677 }
f30bf3e4 678 } while (bh = bh->b_this_page, bh != head);
9ff05123
RK		 679 }
680 pagevec_release(&pvec);
681 cond_resched();
f30bf3e4 682 goto repeat;
9ff05123
RK		 683}
684
685static void nilfs_lookup_dirty_node_buffers(struct inode *inode,
686 struct list_head *listp)
687{
688 struct nilfs_inode_info *ii = NILFS_I(inode);
689 struct address_space *mapping = &ii->i_btnode_cache;
690 struct pagevec pvec;
691 struct buffer_head *bh, *head;
692 unsigned int i;
693 pgoff_t index = 0;
694
695 pagevec_init(&pvec, 0);
696
697 while (pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY,
698 PAGEVEC_SIZE)) {
699 for (i = 0; i < pagevec_count(&pvec); i++) {
700 bh = head = page_buffers(pvec.pages[i]);
701 do {
702 if (buffer_dirty(bh)) {
703 get_bh(bh);
704 list_add_tail(&bh->b_assoc_buffers,
705 listp);
706 }
707 bh = bh->b_this_page;
708 } while (bh != head);
709 }
710 pagevec_release(&pvec);
711 cond_resched();
712 }
713}
714
693dd321 715static void nilfs_dispose_list(struct the_nilfs *nilfs,
9ff05123
RK		 716 struct list_head *head, int force)
717{
718 struct nilfs_inode_info *ii, *n;
719 struct nilfs_inode_info *ivec[SC_N_INODEVEC], **pii;
720 unsigned nv = 0;
721
722 while (!list_empty(head)) {
693dd321 723 spin_lock(&nilfs->ns_inode_lock);
9ff05123
RK		 724 list_for_each_entry_safe(ii, n, head, i_dirty) {
725 list_del_init(&ii->i_dirty);
726 if (force) {
727 if (unlikely(ii->i_bh)) {
728 brelse(ii->i_bh);
729 ii->i_bh = NULL;
730 }
731 } else if (test_bit(NILFS_I_DIRTY, &ii->i_state)) {
732 set_bit(NILFS_I_QUEUED, &ii->i_state);
733 list_add_tail(&ii->i_dirty,
693dd321 734 &nilfs->ns_dirty_files);
9ff05123
RK		 735 continue;
736 }
737 ivec[nv++] = ii;
738 if (nv == SC_N_INODEVEC)
739 break;
740 }
693dd321 741 spin_unlock(&nilfs->ns_inode_lock);
9ff05123
RK		 742
743 for (pii = ivec; nv > 0; pii++, nv--)
744 iput(&(*pii)->vfs_inode);
745 }
746}
747
e912a5b6
RK		 748static int nilfs_test_metadata_dirty(struct the_nilfs *nilfs,
749 struct nilfs_root *root)
9ff05123 750{
9ff05123
RK		 751 int ret = 0;
752
e912a5b6 753 if (nilfs_mdt_fetch_dirty(root->ifile))
9ff05123
RK		 754 ret++;
755 if (nilfs_mdt_fetch_dirty(nilfs->ns_cpfile))
756 ret++;
757 if (nilfs_mdt_fetch_dirty(nilfs->ns_sufile))
758 ret++;
365e215c
RK		 759 if ((ret || nilfs_doing_gc()) && nilfs_mdt_fetch_dirty(nilfs->ns_dat))
760 ret++;
9ff05123
RK		 761 return ret;
762}
763
764static int nilfs_segctor_clean(struct nilfs_sc_info *sci)
765{
766 return list_empty(&sci->sc_dirty_files) &&
767 !test_bit(NILFS_SC_DIRTY, &sci->sc_flags) &&
071cb4b8 768 sci->sc_nfreesegs == 0 &&
9ff05123
RK		 769 (!nilfs_doing_gc() || list_empty(&sci->sc_gc_inodes));
770}
771
772static int nilfs_segctor_confirm(struct nilfs_sc_info *sci)
773{
e3154e97 774 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
9ff05123
RK		 775 int ret = 0;
776
693dd321 777 if (nilfs_test_metadata_dirty(nilfs, sci->sc_root))
9ff05123
RK		 778 set_bit(NILFS_SC_DIRTY, &sci->sc_flags);
779
693dd321
RK		 780 spin_lock(&nilfs->ns_inode_lock);
781 if (list_empty(&nilfs->ns_dirty_files) && nilfs_segctor_clean(sci))
9ff05123
RK		 782 ret++;
783
693dd321 784 spin_unlock(&nilfs->ns_inode_lock);
9ff05123
RK		 785 return ret;
786}
787
788static void nilfs_segctor_clear_metadata_dirty(struct nilfs_sc_info *sci)
789{
e3154e97 790 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
9ff05123 791
e912a5b6 792 nilfs_mdt_clear_dirty(sci->sc_root->ifile);
9ff05123
RK		 793 nilfs_mdt_clear_dirty(nilfs->ns_cpfile);
794 nilfs_mdt_clear_dirty(nilfs->ns_sufile);
365e215c 795 nilfs_mdt_clear_dirty(nilfs->ns_dat);
9ff05123
RK		 796}
797
798static int nilfs_segctor_create_checkpoint(struct nilfs_sc_info *sci)
799{
e3154e97 800 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
9ff05123
RK		 801 struct buffer_head *bh_cp;
802 struct nilfs_checkpoint *raw_cp;
803 int err;
804
805 /* XXX: this interface will be changed */
806 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 1,
807 &raw_cp, &bh_cp);
808 if (likely(!err)) {
809 /* The following code is duplicated with cpfile. But, it is
810 needed to collect the checkpoint even if it was not newly
811 created */
812 nilfs_mdt_mark_buffer_dirty(bh_cp);
813 nilfs_mdt_mark_dirty(nilfs->ns_cpfile);
814 nilfs_cpfile_put_checkpoint(
815 nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
1f5abe7e
RK		 816 } else
817 WARN_ON(err == -EINVAL || err == -ENOENT);
818
9ff05123
RK		 819 return err;
820}
821
822static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci)
823{
e3154e97 824 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
9ff05123
RK		 825 struct buffer_head *bh_cp;
826 struct nilfs_checkpoint *raw_cp;
827 int err;
828
829 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 0,
830 &raw_cp, &bh_cp);
831 if (unlikely(err)) {
1f5abe7e 832 WARN_ON(err == -EINVAL || err == -ENOENT);
9ff05123
RK		 833 goto failed_ibh;
834 }
835 raw_cp->cp_snapshot_list.ssl_next = 0;
836 raw_cp->cp_snapshot_list.ssl_prev = 0;
837 raw_cp->cp_inodes_count =
b7c06342 838 cpu_to_le64(atomic_read(&sci->sc_root->inodes_count));
9ff05123 839 raw_cp->cp_blocks_count =
b7c06342 840 cpu_to_le64(atomic_read(&sci->sc_root->blocks_count));
9ff05123
RK		 841 raw_cp->cp_nblk_inc =
842 cpu_to_le64(sci->sc_nblk_inc + sci->sc_nblk_this_inc);
843 raw_cp->cp_create = cpu_to_le64(sci->sc_seg_ctime);
844 raw_cp->cp_cno = cpu_to_le64(nilfs->ns_cno);
458c5b08 845
c96fa464
RK		 846 if (test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags))
847 nilfs_checkpoint_clear_minor(raw_cp);
848 else
849 nilfs_checkpoint_set_minor(raw_cp);
850
e912a5b6
RK		 851 nilfs_write_inode_common(sci->sc_root->ifile,
852 &raw_cp->cp_ifile_inode, 1);
9ff05123
RK		 853 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
854 return 0;
855
856 failed_ibh:
857 return err;
858}
859
860static void nilfs_fill_in_file_bmap(struct inode *ifile,
861 struct nilfs_inode_info *ii)
862
863{
864 struct buffer_head *ibh;
865 struct nilfs_inode *raw_inode;
866
867 if (test_bit(NILFS_I_BMAP, &ii->i_state)) {
868 ibh = ii->i_bh;
869 BUG_ON(!ibh);
870 raw_inode = nilfs_ifile_map_inode(ifile, ii->vfs_inode.i_ino,
871 ibh);
872 nilfs_bmap_write(ii->i_bmap, raw_inode);
873 nilfs_ifile_unmap_inode(ifile, ii->vfs_inode.i_ino, ibh);
874 }
875}
876
e912a5b6 877static void nilfs_segctor_fill_in_file_bmap(struct nilfs_sc_info *sci)
9ff05123
RK		 878{
879 struct nilfs_inode_info *ii;
880
881 list_for_each_entry(ii, &sci->sc_dirty_files, i_dirty) {
e912a5b6 882 nilfs_fill_in_file_bmap(sci->sc_root->ifile, ii);
9ff05123
RK		 883 set_bit(NILFS_I_COLLECTED, &ii->i_state);
884 }
9ff05123
RK		 885}
886
9ff05123
RK		 887static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info *sci,
888 struct the_nilfs *nilfs)
889{
1e2b68bf
RK		 890 struct buffer_head *bh_sr;
891 struct nilfs_super_root *raw_sr;
9ff05123
RK		 892 unsigned isz = nilfs->ns_inode_size;
893
1e2b68bf
RK		 894 bh_sr = NILFS_LAST_SEGBUF(&sci->sc_segbufs)->sb_super_root;
895 raw_sr = (struct nilfs_super_root *)bh_sr->b_data;
896
6c6de1aa 897 raw_sr->sr_bytes = cpu_to_le16(NILFS_SR_BYTES(isz));
9ff05123
RK		 898 raw_sr->sr_nongc_ctime
899 = cpu_to_le64(nilfs_doing_gc() ?
900 nilfs->ns_nongc_ctime : sci->sc_seg_ctime);
901 raw_sr->sr_flags = 0;
902
365e215c 903 nilfs_write_inode_common(nilfs->ns_dat, (void *)raw_sr +
3961f0e2
RK		 904 NILFS_SR_DAT_OFFSET(isz), 1);
905 nilfs_write_inode_common(nilfs->ns_cpfile, (void *)raw_sr +
906 NILFS_SR_CPFILE_OFFSET(isz), 1);
907 nilfs_write_inode_common(nilfs->ns_sufile, (void *)raw_sr +
908 NILFS_SR_SUFILE_OFFSET(isz), 1);
9ff05123
RK		 909}
910
911static void nilfs_redirty_inodes(struct list_head *head)
912{
913 struct nilfs_inode_info *ii;
914
915 list_for_each_entry(ii, head, i_dirty) {
916 if (test_bit(NILFS_I_COLLECTED, &ii->i_state))
917 clear_bit(NILFS_I_COLLECTED, &ii->i_state);
918 }
919}
920
921static void nilfs_drop_collected_inodes(struct list_head *head)
922{
923 struct nilfs_inode_info *ii;
924
925 list_for_each_entry(ii, head, i_dirty) {
926 if (!test_and_clear_bit(NILFS_I_COLLECTED, &ii->i_state))
927 continue;
928
929 clear_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
930 set_bit(NILFS_I_UPDATED, &ii->i_state);
931 }
932}
933
9ff05123
RK		 934static int nilfs_segctor_apply_buffers(struct nilfs_sc_info *sci,
935 struct inode *inode,
936 struct list_head *listp,
937 int (*collect)(struct nilfs_sc_info *,
938 struct buffer_head *,
939 struct inode *))
940{
941 struct buffer_head *bh, *n;
942 int err = 0;
943
944 if (collect) {
945 list_for_each_entry_safe(bh, n, listp, b_assoc_buffers) {
946 list_del_init(&bh->b_assoc_buffers);
947 err = collect(sci, bh, inode);
948 brelse(bh);
949 if (unlikely(err))
950 goto dispose_buffers;
951 }
952 return 0;
953 }
954
955 dispose_buffers:
956 while (!list_empty(listp)) {
957 bh = list_entry(listp->next, struct buffer_head,
958 b_assoc_buffers);
959 list_del_init(&bh->b_assoc_buffers);
960 brelse(bh);
961 }
962 return err;
963}
964
f30bf3e4
RK		 965static size_t nilfs_segctor_buffer_rest(struct nilfs_sc_info *sci)
966{
967 /* Remaining number of blocks within segment buffer */
968 return sci->sc_segbuf_nblocks -
969 (sci->sc_nblk_this_inc + sci->sc_curseg->sb_sum.nblocks);
970}
971
9ff05123
RK		 972static int nilfs_segctor_scan_file(struct nilfs_sc_info *sci,
973 struct inode *inode,
974 struct nilfs_sc_operations *sc_ops)
975{
976 LIST_HEAD(data_buffers);
977 LIST_HEAD(node_buffers);
f30bf3e4 978 int err;
9ff05123
RK		 979
980 if (!(sci->sc_stage.flags & NILFS_CF_NODE)) {
f30bf3e4
RK		 981 size_t n, rest = nilfs_segctor_buffer_rest(sci);
982
983 n = nilfs_lookup_dirty_data_buffers(
984 inode, &data_buffers, rest + 1, 0, LLONG_MAX);
985 if (n > rest) {
986 err = nilfs_segctor_apply_buffers(
9ff05123 987 sci, inode, &data_buffers,
f30bf3e4
RK		 988 sc_ops->collect_data);
989 BUG_ON(!err); /* always receive -E2BIG or true error */
9ff05123
RK		 990 goto break_or_fail;
991 }
992 }
993 nilfs_lookup_dirty_node_buffers(inode, &node_buffers);
994
995 if (!(sci->sc_stage.flags & NILFS_CF_NODE)) {
996 err = nilfs_segctor_apply_buffers(
997 sci, inode, &data_buffers, sc_ops->collect_data);
998 if (unlikely(err)) {
999 /* dispose node list */
1000 nilfs_segctor_apply_buffers(
1001 sci, inode, &node_buffers, NULL);
1002 goto break_or_fail;
1003 }
1004 sci->sc_stage.flags |= NILFS_CF_NODE;
1005 }
1006 /* Collect node */
1007 err = nilfs_segctor_apply_buffers(
1008 sci, inode, &node_buffers, sc_ops->collect_node);
1009 if (unlikely(err))
1010 goto break_or_fail;
1011
1012 nilfs_bmap_lookup_dirty_buffers(NILFS_I(inode)->i_bmap, &node_buffers);
1013 err = nilfs_segctor_apply_buffers(
1014 sci, inode, &node_buffers, sc_ops->collect_bmap);
1015 if (unlikely(err))
1016 goto break_or_fail;
1017
1018 nilfs_segctor_end_finfo(sci, inode);
1019 sci->sc_stage.flags &= ~NILFS_CF_NODE;
1020
1021 break_or_fail:
1022 return err;
1023}
1024
1025static int nilfs_segctor_scan_file_dsync(struct nilfs_sc_info *sci,
1026 struct inode *inode)
1027{
1028 LIST_HEAD(data_buffers);
f30bf3e4
RK		 1029 size_t n, rest = nilfs_segctor_buffer_rest(sci);
1030 int err;
9ff05123 1031
f30bf3e4
RK		 1032 n = nilfs_lookup_dirty_data_buffers(inode, &data_buffers, rest + 1,
1033 sci->sc_dsync_start,
1034 sci->sc_dsync_end);
1035
1036 err = nilfs_segctor_apply_buffers(sci, inode, &data_buffers,
1037 nilfs_collect_file_data);
1038 if (!err) {
9ff05123 1039 nilfs_segctor_end_finfo(sci, inode);
f30bf3e4
RK		 1040 BUG_ON(n > rest);
1041 /* always receive -E2BIG or true error if n > rest */
1042 }
9ff05123
RK		 1043 return err;
1044}
1045
1046static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode)
1047{
e3154e97 1048 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
9ff05123
RK		 1049 struct list_head *head;
1050 struct nilfs_inode_info *ii;
071cb4b8 1051 size_t ndone;
9ff05123
RK		 1052 int err = 0;
1053
1054 switch (sci->sc_stage.scnt) {
1055 case NILFS_ST_INIT:
1056 /* Pre-processes */
1057 sci->sc_stage.flags = 0;
1058
1059 if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) {
1060 sci->sc_nblk_inc = 0;
1061 sci->sc_curseg->sb_sum.flags = NILFS_SS_LOGBGN;
1062 if (mode == SC_LSEG_DSYNC) {
1063 sci->sc_stage.scnt = NILFS_ST_DSYNC;
1064 goto dsync_mode;
1065 }
1066 }
1067
1068 sci->sc_stage.dirty_file_ptr = NULL;
1069 sci->sc_stage.gc_inode_ptr = NULL;
1070 if (mode == SC_FLUSH_DAT) {
1071 sci->sc_stage.scnt = NILFS_ST_DAT;
1072 goto dat_stage;
1073 }
1074 sci->sc_stage.scnt++; /* Fall through */
1075 case NILFS_ST_GC:
1076 if (nilfs_doing_gc()) {
1077 head = &sci->sc_gc_inodes;
1078 ii = list_prepare_entry(sci->sc_stage.gc_inode_ptr,
1079 head, i_dirty);
1080 list_for_each_entry_continue(ii, head, i_dirty) {
1081 err = nilfs_segctor_scan_file(
1082 sci, &ii->vfs_inode,
1083 &nilfs_sc_file_ops);
1084 if (unlikely(err)) {
1085 sci->sc_stage.gc_inode_ptr = list_entry(
1086 ii->i_dirty.prev,
1087 struct nilfs_inode_info,
1088 i_dirty);
1089 goto break_or_fail;
1090 }
1091 set_bit(NILFS_I_COLLECTED, &ii->i_state);
1092 }
1093 sci->sc_stage.gc_inode_ptr = NULL;
1094 }
1095 sci->sc_stage.scnt++; /* Fall through */
1096 case NILFS_ST_FILE:
1097 head = &sci->sc_dirty_files;
1098 ii = list_prepare_entry(sci->sc_stage.dirty_file_ptr, head,
1099 i_dirty);
1100 list_for_each_entry_continue(ii, head, i_dirty) {
1101 clear_bit(NILFS_I_DIRTY, &ii->i_state);
1102
1103 err = nilfs_segctor_scan_file(sci, &ii->vfs_inode,
1104 &nilfs_sc_file_ops);
1105 if (unlikely(err)) {
1106 sci->sc_stage.dirty_file_ptr =
1107 list_entry(ii->i_dirty.prev,
1108 struct nilfs_inode_info,
1109 i_dirty);
1110 goto break_or_fail;
1111 }
1112 /* sci->sc_stage.dirty_file_ptr = NILFS_I(inode); */
1113 /* XXX: required ? */
1114 }
1115 sci->sc_stage.dirty_file_ptr = NULL;
1116 if (mode == SC_FLUSH_FILE) {
1117 sci->sc_stage.scnt = NILFS_ST_DONE;
1118 return 0;
1119 }
9ff05123
RK		 1120 sci->sc_stage.scnt++;
1121 sci->sc_stage.flags |= NILFS_CF_IFILE_STARTED;
1122 /* Fall through */
1123 case NILFS_ST_IFILE:
e912a5b6 1124 err = nilfs_segctor_scan_file(sci, sci->sc_root->ifile,
9ff05123
RK		 1125 &nilfs_sc_file_ops);
1126 if (unlikely(err))
1127 break;
1128 sci->sc_stage.scnt++;
1129 /* Creating a checkpoint */
1130 err = nilfs_segctor_create_checkpoint(sci);
1131 if (unlikely(err))
1132 break;
1133 /* Fall through */
1134 case NILFS_ST_CPFILE:
1135 err = nilfs_segctor_scan_file(sci, nilfs->ns_cpfile,
1136 &nilfs_sc_file_ops);
1137 if (unlikely(err))
1138 break;
1139 sci->sc_stage.scnt++; /* Fall through */
1140 case NILFS_ST_SUFILE:
071cb4b8
RK		 1141 err = nilfs_sufile_freev(nilfs->ns_sufile, sci->sc_freesegs,
1142 sci->sc_nfreesegs, &ndone);
1143 if (unlikely(err)) {
1144 nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1145 sci->sc_freesegs, ndone,
1146 NULL);
9ff05123 1147 break;
071cb4b8
RK		 1148 }
1149 sci->sc_stage.flags |= NILFS_CF_SUFREED;
1150
9ff05123
RK		 1151 err = nilfs_segctor_scan_file(sci, nilfs->ns_sufile,
1152 &nilfs_sc_file_ops);
1153 if (unlikely(err))
1154 break;
1155 sci->sc_stage.scnt++; /* Fall through */
1156 case NILFS_ST_DAT:
1157 dat_stage:
365e215c 1158 err = nilfs_segctor_scan_file(sci, nilfs->ns_dat,
9ff05123
RK		 1159 &nilfs_sc_dat_ops);
1160 if (unlikely(err))
1161 break;
1162 if (mode == SC_FLUSH_DAT) {
1163 sci->sc_stage.scnt = NILFS_ST_DONE;
1164 return 0;
1165 }
1166 sci->sc_stage.scnt++; /* Fall through */
1167 case NILFS_ST_SR:
1168 if (mode == SC_LSEG_SR) {
1169 /* Appending a super root */
1170 err = nilfs_segctor_add_super_root(sci);
1171 if (unlikely(err))
1172 break;
1173 }
1174 /* End of a logical segment */
1175 sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND;
1176 sci->sc_stage.scnt = NILFS_ST_DONE;
1177 return 0;
1178 case NILFS_ST_DSYNC:
1179 dsync_mode:
1180 sci->sc_curseg->sb_sum.flags |= NILFS_SS_SYNDT;
f30bf3e4 1181 ii = sci->sc_dsync_inode;
9ff05123
RK		 1182 if (!test_bit(NILFS_I_BUSY, &ii->i_state))
1183 break;
1184
1185 err = nilfs_segctor_scan_file_dsync(sci, &ii->vfs_inode);
1186 if (unlikely(err))
1187 break;
9ff05123
RK		 1188 sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND;
1189 sci->sc_stage.scnt = NILFS_ST_DONE;
1190 return 0;
1191 case NILFS_ST_DONE:
1192 return 0;
1193 default:
1194 BUG();
1195 }
1196
1197 break_or_fail:
1198 return err;
1199}
1200
a694291a
RK		 1201/**
1202 * nilfs_segctor_begin_construction - setup segment buffer to make a new log
1203 * @sci: nilfs_sc_info
1204 * @nilfs: nilfs object
1205 */
9ff05123
RK		 1206static int nilfs_segctor_begin_construction(struct nilfs_sc_info *sci,
1207 struct the_nilfs *nilfs)
1208{
a694291a 1209 struct nilfs_segment_buffer *segbuf, *prev;
9ff05123 1210 __u64 nextnum;
a694291a 1211 int err, alloc = 0;
9ff05123 1212
a694291a
RK		 1213 segbuf = nilfs_segbuf_new(sci->sc_super);
1214 if (unlikely(!segbuf))
1215 return -ENOMEM;
9ff05123 1216
a694291a
RK		 1217 if (list_empty(&sci->sc_write_logs)) {
1218 nilfs_segbuf_map(segbuf, nilfs->ns_segnum,
1219 nilfs->ns_pseg_offset, nilfs);
1220 if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
1221 nilfs_shift_to_next_segment(nilfs);
1222 nilfs_segbuf_map(segbuf, nilfs->ns_segnum, 0, nilfs);
1223 }
9ff05123 1224
a694291a
RK		 1225 segbuf->sb_sum.seg_seq = nilfs->ns_seg_seq;
1226 nextnum = nilfs->ns_nextnum;
1227
1228 if (nilfs->ns_segnum == nilfs->ns_nextnum)
1229 /* Start from the head of a new full segment */
1230 alloc++;
1231 } else {
1232 /* Continue logs */
1233 prev = NILFS_LAST_SEGBUF(&sci->sc_write_logs);
1234 nilfs_segbuf_map_cont(segbuf, prev);
1235 segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq;
1236 nextnum = prev->sb_nextnum;
1237
1238 if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
1239 nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs);
1240 segbuf->sb_sum.seg_seq++;
1241 alloc++;
1242 }
9ff05123 1243 }
9ff05123 1244
61a189e9 1245 err = nilfs_sufile_mark_dirty(nilfs->ns_sufile, segbuf->sb_segnum);
a694291a
RK		 1246 if (err)
1247 goto failed;
9ff05123 1248
a694291a 1249 if (alloc) {
cece5520 1250 err = nilfs_sufile_alloc(nilfs->ns_sufile, &nextnum);
a694291a
RK		 1251 if (err)
1252 goto failed;
1253 }
9ff05123
RK		 1254 nilfs_segbuf_set_next_segnum(segbuf, nextnum, nilfs);
1255
a694291a
RK		 1256 BUG_ON(!list_empty(&sci->sc_segbufs));
1257 list_add_tail(&segbuf->sb_list, &sci->sc_segbufs);
1258 sci->sc_segbuf_nblocks = segbuf->sb_rest_blocks;
cece5520 1259 return 0;
a694291a
RK		 1260
1261 failed:
1262 nilfs_segbuf_free(segbuf);
1263 return err;
9ff05123
RK		 1264}
1265
1266static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci,
1267 struct the_nilfs *nilfs, int nadd)
1268{
e29df395 1269 struct nilfs_segment_buffer *segbuf, *prev;
9ff05123
RK		 1270 struct inode *sufile = nilfs->ns_sufile;
1271 __u64 nextnextnum;
1272 LIST_HEAD(list);
1273 int err, ret, i;
1274
1275 prev = NILFS_LAST_SEGBUF(&sci->sc_segbufs);
1276 /*
1277 * Since the segment specified with nextnum might be allocated during
1278 * the previous construction, the buffer including its segusage may
1279 * not be dirty. The following call ensures that the buffer is dirty
1280 * and will pin the buffer on memory until the sufile is written.
1281 */
61a189e9 1282 err = nilfs_sufile_mark_dirty(sufile, prev->sb_nextnum);
9ff05123
RK		 1283 if (unlikely(err))
1284 return err;
1285
1286 for (i = 0; i < nadd; i++) {
1287 /* extend segment info */
1288 err = -ENOMEM;
1289 segbuf = nilfs_segbuf_new(sci->sc_super);
1290 if (unlikely(!segbuf))
1291 goto failed;
1292
1293 /* map this buffer to region of segment on-disk */
cece5520 1294 nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs);
9ff05123
RK		 1295 sci->sc_segbuf_nblocks += segbuf->sb_rest_blocks;
1296
1297 /* allocate the next next full segment */
1298 err = nilfs_sufile_alloc(sufile, &nextnextnum);
1299 if (unlikely(err))
1300 goto failed_segbuf;
1301
1302 segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq + 1;
1303 nilfs_segbuf_set_next_segnum(segbuf, nextnextnum, nilfs);
1304
1305 list_add_tail(&segbuf->sb_list, &list);
1306 prev = segbuf;
1307 }
0935db74 1308 list_splice_tail(&list, &sci->sc_segbufs);
9ff05123
RK		 1309 return 0;
1310
1311 failed_segbuf:
1312 nilfs_segbuf_free(segbuf);
1313 failed:
e29df395 1314 list_for_each_entry(segbuf, &list, sb_list) {
9ff05123 1315 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1f5abe7e 1316 WARN_ON(ret); /* never fails */
9ff05123 1317 }
e29df395 1318 nilfs_destroy_logs(&list);
9ff05123
RK		 1319 return err;
1320}
1321
a694291a
RK		 1322static void nilfs_free_incomplete_logs(struct list_head *logs,
1323 struct the_nilfs *nilfs)
9ff05123 1324{
a694291a
RK		 1325 struct nilfs_segment_buffer *segbuf, *prev;
1326 struct inode *sufile = nilfs->ns_sufile;
9284ad2a 1327 int ret;
9ff05123 1328
a694291a 1329 segbuf = NILFS_FIRST_SEGBUF(logs);
9ff05123 1330 if (nilfs->ns_nextnum != segbuf->sb_nextnum) {
a694291a 1331 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1f5abe7e 1332 WARN_ON(ret); /* never fails */
9ff05123 1333 }
9284ad2a 1334 if (atomic_read(&segbuf->sb_err)) {
9ff05123
RK		 1335 /* Case 1: The first segment failed */
1336 if (segbuf->sb_pseg_start != segbuf->sb_fseg_start)
1337 /* Case 1a: Partial segment appended into an existing
1338 segment */
1339 nilfs_terminate_segment(nilfs, segbuf->sb_fseg_start,
1340 segbuf->sb_fseg_end);
1341 else /* Case 1b: New full segment */
1342 set_nilfs_discontinued(nilfs);
9ff05123
RK		 1343 }
1344
a694291a
RK		 1345 prev = segbuf;
1346 list_for_each_entry_continue(segbuf, logs, sb_list) {
1347 if (prev->sb_nextnum != segbuf->sb_nextnum) {
1348 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1349 WARN_ON(ret); /* never fails */
1350 }
9284ad2a
RK		 1351 if (atomic_read(&segbuf->sb_err) &&
1352 segbuf->sb_segnum != nilfs->ns_nextnum)
1353 /* Case 2: extended segment (!= next) failed */
a694291a
RK		 1354 nilfs_sufile_set_error(sufile, segbuf->sb_segnum);
1355 prev = segbuf;
9ff05123 1356 }
9ff05123
RK		 1357}
1358
1359static void nilfs_segctor_update_segusage(struct nilfs_sc_info *sci,
1360 struct inode *sufile)
1361{
1362 struct nilfs_segment_buffer *segbuf;
9ff05123
RK		 1363 unsigned long live_blocks;
1364 int ret;
1365
1366 list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
9ff05123
RK		 1367 live_blocks = segbuf->sb_sum.nblocks +
1368 (segbuf->sb_pseg_start - segbuf->sb_fseg_start);
071ec54d
RK		 1369 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1370 live_blocks,
1371 sci->sc_seg_ctime);
1372 WARN_ON(ret); /* always succeed because the segusage is dirty */
9ff05123
RK		 1373 }
1374}
1375
a694291a 1376static void nilfs_cancel_segusage(struct list_head *logs, struct inode *sufile)
9ff05123
RK		 1377{
1378 struct nilfs_segment_buffer *segbuf;
9ff05123
RK		 1379 int ret;
1380
a694291a 1381 segbuf = NILFS_FIRST_SEGBUF(logs);
071ec54d
RK		 1382 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1383 segbuf->sb_pseg_start -
1384 segbuf->sb_fseg_start, 0);
1385 WARN_ON(ret); /* always succeed because the segusage is dirty */
9ff05123 1386
a694291a 1387 list_for_each_entry_continue(segbuf, logs, sb_list) {
071ec54d
RK		 1388 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1389 0, 0);
1f5abe7e 1390 WARN_ON(ret); /* always succeed */
9ff05123
RK		 1391 }
1392}
1393
1394static void nilfs_segctor_truncate_segments(struct nilfs_sc_info *sci,
1395 struct nilfs_segment_buffer *last,
1396 struct inode *sufile)
1397{
e29df395 1398 struct nilfs_segment_buffer *segbuf = last;
9ff05123
RK		 1399 int ret;
1400
e29df395 1401 list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) {
9ff05123
RK		 1402 sci->sc_segbuf_nblocks -= segbuf->sb_rest_blocks;
1403 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1f5abe7e 1404 WARN_ON(ret);
9ff05123 1405 }
e29df395 1406 nilfs_truncate_logs(&sci->sc_segbufs, last);
9ff05123
RK		 1407}
1408
1409
1410static int nilfs_segctor_collect(struct nilfs_sc_info *sci,
1411 struct the_nilfs *nilfs, int mode)
1412{
1413 struct nilfs_cstage prev_stage = sci->sc_stage;
1414 int err, nadd = 1;
1415
1416 /* Collection retry loop */
1417 for (;;) {
9ff05123
RK		 1418 sci->sc_nblk_this_inc = 0;
1419 sci->sc_curseg = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
1420
1421 err = nilfs_segctor_reset_segment_buffer(sci);
1422 if (unlikely(err))
1423 goto failed;
1424
1425 err = nilfs_segctor_collect_blocks(sci, mode);
1426 sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
1427 if (!err)
1428 break;
1429
1430 if (unlikely(err != -E2BIG))
1431 goto failed;
1432
1433 /* The current segment is filled up */
1434 if (mode != SC_LSEG_SR || sci->sc_stage.scnt < NILFS_ST_CPFILE)
1435 break;
1436
2d8428ac
RK		 1437 nilfs_clear_logs(&sci->sc_segbufs);
1438
1439 err = nilfs_segctor_extend_segments(sci, nilfs, nadd);
1440 if (unlikely(err))
1441 return err;
1442
071cb4b8
RK		 1443 if (sci->sc_stage.flags & NILFS_CF_SUFREED) {
1444 err = nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1445 sci->sc_freesegs,
1446 sci->sc_nfreesegs,
1447 NULL);
1448 WARN_ON(err); /* do not happen */
1449 }
9ff05123
RK		 1450 nadd = min_t(int, nadd << 1, SC_MAX_SEGDELTA);
1451 sci->sc_stage = prev_stage;
1452 }
1453 nilfs_segctor_truncate_segments(sci, sci->sc_curseg, nilfs->ns_sufile);
1454 return 0;
1455
1456 failed:
1457 return err;
1458}
1459
1460static void nilfs_list_replace_buffer(struct buffer_head *old_bh,
1461 struct buffer_head *new_bh)
1462{
1463 BUG_ON(!list_empty(&new_bh->b_assoc_buffers));
1464
1465 list_replace_init(&old_bh->b_assoc_buffers, &new_bh->b_assoc_buffers);
1466 /* The caller must release old_bh */
1467}
1468
1469static int
1470nilfs_segctor_update_payload_blocknr(struct nilfs_sc_info *sci,
1471 struct nilfs_segment_buffer *segbuf,
1472 int mode)
1473{
1474 struct inode *inode = NULL;
1475 sector_t blocknr;
1476 unsigned long nfinfo = segbuf->sb_sum.nfinfo;
1477 unsigned long nblocks = 0, ndatablk = 0;
1478 struct nilfs_sc_operations *sc_op = NULL;
1479 struct nilfs_segsum_pointer ssp;
1480 struct nilfs_finfo *finfo = NULL;
1481 union nilfs_binfo binfo;
1482 struct buffer_head *bh, *bh_org;
1483 ino_t ino = 0;
1484 int err = 0;
1485
1486 if (!nfinfo)
1487 goto out;
1488
1489 blocknr = segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk;
1490 ssp.bh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers);
1491 ssp.offset = sizeof(struct nilfs_segment_summary);
1492
1493 list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
1e2b68bf 1494 if (bh == segbuf->sb_super_root)
9ff05123
RK		 1495 break;
1496 if (!finfo) {
1497 finfo = nilfs_segctor_map_segsum_entry(
1498 sci, &ssp, sizeof(*finfo));
1499 ino = le64_to_cpu(finfo->fi_ino);
1500 nblocks = le32_to_cpu(finfo->fi_nblocks);
1501 ndatablk = le32_to_cpu(finfo->fi_ndatablk);
1502
1503 if (buffer_nilfs_node(bh))
1504 inode = NILFS_BTNC_I(bh->b_page->mapping);
1505 else
1506 inode = NILFS_AS_I(bh->b_page->mapping);
1507
1508 if (mode == SC_LSEG_DSYNC)
1509 sc_op = &nilfs_sc_dsync_ops;
1510 else if (ino == NILFS_DAT_INO)
1511 sc_op = &nilfs_sc_dat_ops;
1512 else /* file blocks */
1513 sc_op = &nilfs_sc_file_ops;
1514 }
1515 bh_org = bh;
1516 get_bh(bh_org);
1517 err = nilfs_bmap_assign(NILFS_I(inode)->i_bmap, &bh, blocknr,
1518 &binfo);
1519 if (bh != bh_org)
1520 nilfs_list_replace_buffer(bh_org, bh);
1521 brelse(bh_org);
1522 if (unlikely(err))
1523 goto failed_bmap;
1524
1525 if (ndatablk > 0)
1526 sc_op->write_data_binfo(sci, &ssp, &binfo);
1527 else
1528 sc_op->write_node_binfo(sci, &ssp, &binfo);
1529
1530 blocknr++;
1531 if (--nblocks == 0) {
1532 finfo = NULL;
1533 if (--nfinfo == 0)
1534 break;
1535 } else if (ndatablk > 0)
1536 ndatablk--;
1537 }
1538 out:
1539 return 0;
1540
1541 failed_bmap:
9ff05123
RK		 1542 return err;
1543}
1544
1545static int nilfs_segctor_assign(struct nilfs_sc_info *sci, int mode)
1546{
1547 struct nilfs_segment_buffer *segbuf;
1548 int err;
1549
1550 list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
1551 err = nilfs_segctor_update_payload_blocknr(sci, segbuf, mode);
1552 if (unlikely(err))
1553 return err;
1554 nilfs_segbuf_fill_in_segsum(segbuf);
1555 }
1556 return 0;
1557}
1558
1cb2d38c 1559static void nilfs_begin_page_io(struct page *page)
9ff05123
RK		 1560{
1561 if (!page || PageWriteback(page))
1562 /* For split b-tree node pages, this function may be called
1563 twice. We ignore the 2nd or later calls by this check. */
1cb2d38c 1564 return;
9ff05123
RK		 1565
1566 lock_page(page);
1567 clear_page_dirty_for_io(page);
1568 set_page_writeback(page);
1569 unlock_page(page);
9ff05123
RK		 1570}
1571
1cb2d38c 1572static void nilfs_segctor_prepare_write(struct nilfs_sc_info *sci)
9ff05123
RK		 1573{
1574 struct nilfs_segment_buffer *segbuf;
1575 struct page *bd_page = NULL, *fs_page = NULL;
9ff05123 1576
9ff05123
RK		 1577 list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
1578 struct buffer_head *bh;
1579
1580 list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
1581 b_assoc_buffers) {
1582 if (bh->b_page != bd_page) {
1583 if (bd_page) {
1584 lock_page(bd_page);
1585 clear_page_dirty_for_io(bd_page);
1586 set_page_writeback(bd_page);
1587 unlock_page(bd_page);
1588 }
1589 bd_page = bh->b_page;
1590 }
1591 }
1592
1593 list_for_each_entry(bh, &segbuf->sb_payload_buffers,
1594 b_assoc_buffers) {
1e2b68bf 1595 if (bh == segbuf->sb_super_root) {
9ff05123
RK		 1596 if (bh->b_page != bd_page) {
1597 lock_page(bd_page);
1598 clear_page_dirty_for_io(bd_page);
1599 set_page_writeback(bd_page);
1600 unlock_page(bd_page);
1601 bd_page = bh->b_page;
1602 }
1603 break;
1604 }
1605 if (bh->b_page != fs_page) {
1cb2d38c 1606 nilfs_begin_page_io(fs_page);
9ff05123
RK		 1607 fs_page = bh->b_page;
1608 }
1609 }
1610 }
1611 if (bd_page) {
1612 lock_page(bd_page);
1613 clear_page_dirty_for_io(bd_page);
1614 set_page_writeback(bd_page);
1615 unlock_page(bd_page);
1616 }
1cb2d38c 1617 nilfs_begin_page_io(fs_page);
9ff05123
RK		 1618}
1619
1620static int nilfs_segctor_write(struct nilfs_sc_info *sci,
9c965bac 1621 struct the_nilfs *nilfs)
9ff05123 1622{
d1c6b72a 1623 int ret;
9ff05123 1624
d1c6b72a 1625 ret = nilfs_write_logs(&sci->sc_segbufs, nilfs);
a694291a
RK		 1626 list_splice_tail_init(&sci->sc_segbufs, &sci->sc_write_logs);
1627 return ret;
9ff05123
RK		 1628}
1629
9ff05123
RK		 1630static void nilfs_end_page_io(struct page *page, int err)
1631{
1632 if (!page)
1633 return;
1634
a9777845 1635 if (buffer_nilfs_node(page_buffers(page)) && !PageWriteback(page)) {
8227b297
RK		 1636 /*
1637 * For b-tree node pages, this function may be called twice
1638 * or more because they might be split in a segment.
1639 */
a9777845
RK		 1640 if (PageDirty(page)) {
1641 /*
1642 * For pages holding split b-tree node buffers, dirty
1643 * flag on the buffers may be cleared discretely.
1644 * In that case, the page is once redirtied for
1645 * remaining buffers, and it must be cancelled if
1646 * all the buffers get cleaned later.
1647 */
1648 lock_page(page);
1649 if (nilfs_page_buffers_clean(page))
1650 __nilfs_clear_page_dirty(page);
1651 unlock_page(page);
1652 }
9ff05123 1653 return;
a9777845 1654 }
9ff05123 1655
1cb2d38c
RK		 1656 if (!err) {
1657 if (!nilfs_page_buffers_clean(page))
1658 __set_page_dirty_nobuffers(page);
1659 ClearPageError(page);
1660 } else {
1661 __set_page_dirty_nobuffers(page);
1662 SetPageError(page);
9ff05123 1663 }
1cb2d38c
RK		 1664
1665 end_page_writeback(page);
9ff05123
RK		 1666}
1667
1cb2d38c 1668static void nilfs_abort_logs(struct list_head *logs, int err)
9ff05123
RK		 1669{
1670 struct nilfs_segment_buffer *segbuf;
1671 struct page *bd_page = NULL, *fs_page = NULL;
a694291a 1672 struct buffer_head *bh;
9ff05123 1673
a694291a
RK		 1674 if (list_empty(logs))
1675 return;
9ff05123 1676
a694291a 1677 list_for_each_entry(segbuf, logs, sb_list) {
9ff05123
RK		 1678 list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
1679 b_assoc_buffers) {
1680 if (bh->b_page != bd_page) {
1681 if (bd_page)
1682 end_page_writeback(bd_page);
1683 bd_page = bh->b_page;
1684 }
1685 }
1686
1687 list_for_each_entry(bh, &segbuf->sb_payload_buffers,
1688 b_assoc_buffers) {
1e2b68bf 1689 if (bh == segbuf->sb_super_root) {
9ff05123
RK		 1690 if (bh->b_page != bd_page) {
1691 end_page_writeback(bd_page);
1692 bd_page = bh->b_page;
1693 }
1694 break;
1695 }
1696 if (bh->b_page != fs_page) {
1697 nilfs_end_page_io(fs_page, err);
9ff05123
RK		 1698 fs_page = bh->b_page;
1699 }
1700 }
1701 }
1702 if (bd_page)
1703 end_page_writeback(bd_page);
1704
1705 nilfs_end_page_io(fs_page, err);
a694291a
RK		 1706}
1707
1708static void nilfs_segctor_abort_construction(struct nilfs_sc_info *sci,
1709 struct the_nilfs *nilfs, int err)
1710{
1711 LIST_HEAD(logs);
1712 int ret;
1713
1714 list_splice_tail_init(&sci->sc_write_logs, &logs);
1715 ret = nilfs_wait_on_logs(&logs);
1cb2d38c 1716 nilfs_abort_logs(&logs, ret ? : err);
a694291a
RK		 1717
1718 list_splice_tail_init(&sci->sc_segbufs, &logs);
1719 nilfs_cancel_segusage(&logs, nilfs->ns_sufile);
1720 nilfs_free_incomplete_logs(&logs, nilfs);
a694291a
RK		 1721
1722 if (sci->sc_stage.flags & NILFS_CF_SUFREED) {
1723 ret = nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1724 sci->sc_freesegs,
1725 sci->sc_nfreesegs,
1726 NULL);
1727 WARN_ON(ret); /* do not happen */
1728 }
1729
1730 nilfs_destroy_logs(&logs);
9ff05123
RK		 1731}
1732
1733static void nilfs_set_next_segment(struct the_nilfs *nilfs,
1734 struct nilfs_segment_buffer *segbuf)
1735{
1736 nilfs->ns_segnum = segbuf->sb_segnum;
1737 nilfs->ns_nextnum = segbuf->sb_nextnum;
1738 nilfs->ns_pseg_offset = segbuf->sb_pseg_start - segbuf->sb_fseg_start
1739 + segbuf->sb_sum.nblocks;
1740 nilfs->ns_seg_seq = segbuf->sb_sum.seg_seq;
1741 nilfs->ns_ctime = segbuf->sb_sum.ctime;
1742}
1743
1744static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
1745{
1746 struct nilfs_segment_buffer *segbuf;
1747 struct page *bd_page = NULL, *fs_page = NULL;
e3154e97 1748 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
1e2b68bf 1749 int update_sr = false;
9ff05123 1750
a694291a 1751 list_for_each_entry(segbuf, &sci->sc_write_logs, sb_list) {
9ff05123
RK		 1752 struct buffer_head *bh;
1753
1754 list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
1755 b_assoc_buffers) {
1756 set_buffer_uptodate(bh);
1757 clear_buffer_dirty(bh);
1758 if (bh->b_page != bd_page) {
1759 if (bd_page)
1760 end_page_writeback(bd_page);
1761 bd_page = bh->b_page;
1762 }
1763 }
1764 /*
1765 * We assume that the buffers which belong to the same page
1766 * continue over the buffer list.
1767 * Under this assumption, the last BHs of pages is
1768 * identifiable by the discontinuity of bh->b_page
1769 * (page != fs_page).
1770 *
1771 * For B-tree node blocks, however, this assumption is not
1772 * guaranteed. The cleanup code of B-tree node pages needs
1773 * special care.
1774 */
1775 list_for_each_entry(bh, &segbuf->sb_payload_buffers,
1776 b_assoc_buffers) {
1777 set_buffer_uptodate(bh);
1778 clear_buffer_dirty(bh);
27e6c7a3 1779 clear_buffer_delay(bh);
9ff05123 1780 clear_buffer_nilfs_volatile(bh);
b1f6a4f2 1781 clear_buffer_nilfs_redirected(bh);
1e2b68bf 1782 if (bh == segbuf->sb_super_root) {
9ff05123
RK		 1783 if (bh->b_page != bd_page) {
1784 end_page_writeback(bd_page);
1785 bd_page = bh->b_page;
1786 }
1e2b68bf 1787 update_sr = true;
9ff05123
RK		 1788 break;
1789 }
1790 if (bh->b_page != fs_page) {
1791 nilfs_end_page_io(fs_page, 0);
1792 fs_page = bh->b_page;
1793 }
1794 }
1795
4762077c
RK		 1796 if (!nilfs_segbuf_simplex(segbuf)) {
1797 if (segbuf->sb_sum.flags & NILFS_SS_LOGBGN) {
9ff05123
RK		 1798 set_bit(NILFS_SC_UNCLOSED, &sci->sc_flags);
1799 sci->sc_lseg_stime = jiffies;
1800 }
4762077c 1801 if (segbuf->sb_sum.flags & NILFS_SS_LOGEND)
9ff05123
RK		 1802 clear_bit(NILFS_SC_UNCLOSED, &sci->sc_flags);
1803 }
1804 }
1805 /*
1806 * Since pages may continue over multiple segment buffers,
1807 * end of the last page must be checked outside of the loop.
1808 */
1809 if (bd_page)
1810 end_page_writeback(bd_page);
1811
1812 nilfs_end_page_io(fs_page, 0);
1813
9ff05123
RK		 1814 nilfs_drop_collected_inodes(&sci->sc_dirty_files);
1815
c1c1d709 1816 if (nilfs_doing_gc())
9ff05123 1817 nilfs_drop_collected_inodes(&sci->sc_gc_inodes);
c1c1d709 1818 else
9ff05123 1819 nilfs->ns_nongc_ctime = sci->sc_seg_ctime;
9ff05123
RK		 1820
1821 sci->sc_nblk_inc += sci->sc_nblk_this_inc;
1822
a694291a 1823 segbuf = NILFS_LAST_SEGBUF(&sci->sc_write_logs);
9ff05123
RK		 1824 nilfs_set_next_segment(nilfs, segbuf);
1825
1826 if (update_sr) {
1827 nilfs_set_last_segment(nilfs, segbuf->sb_pseg_start,
e339ad31 1828 segbuf->sb_sum.seg_seq, nilfs->ns_cno++);
9ff05123 1829
c96fa464 1830 clear_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
9ff05123
RK		 1831 clear_bit(NILFS_SC_DIRTY, &sci->sc_flags);
1832 set_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags);
a694291a 1833 nilfs_segctor_clear_metadata_dirty(sci);
9ff05123
RK		 1834 } else
1835 clear_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags);
1836}
1837
a694291a
RK		 1838static int nilfs_segctor_wait(struct nilfs_sc_info *sci)
1839{
1840 int ret;
1841
1842 ret = nilfs_wait_on_logs(&sci->sc_write_logs);
1843 if (!ret) {
1844 nilfs_segctor_complete_write(sci);
1845 nilfs_destroy_logs(&sci->sc_write_logs);
1846 }
1847 return ret;
1848}
1849
693dd321
RK		 1850static int nilfs_segctor_collect_dirty_files(struct nilfs_sc_info *sci,
1851 struct the_nilfs *nilfs)
9ff05123
RK		 1852{
1853 struct nilfs_inode_info *ii, *n;
e912a5b6 1854 struct inode *ifile = sci->sc_root->ifile;
9ff05123 1855
693dd321 1856 spin_lock(&nilfs->ns_inode_lock);
9ff05123 1857 retry:
693dd321 1858 list_for_each_entry_safe(ii, n, &nilfs->ns_dirty_files, i_dirty) {
9ff05123
RK		 1859 if (!ii->i_bh) {
1860 struct buffer_head *ibh;
1861 int err;
1862
693dd321 1863 spin_unlock(&nilfs->ns_inode_lock);
9ff05123 1864 err = nilfs_ifile_get_inode_block(
e912a5b6 1865 ifile, ii->vfs_inode.i_ino, &ibh);
9ff05123 1866 if (unlikely(err)) {
693dd321 1867 nilfs_warning(sci->sc_super, __func__,
9ff05123
RK		 1868 "failed to get inode block.\n");
1869 return err;
1870 }
1871 nilfs_mdt_mark_buffer_dirty(ibh);
e912a5b6 1872 nilfs_mdt_mark_dirty(ifile);
693dd321 1873 spin_lock(&nilfs->ns_inode_lock);
9ff05123
RK		 1874 if (likely(!ii->i_bh))
1875 ii->i_bh = ibh;
1876 else
1877 brelse(ibh);
1878 goto retry;
1879 }
9ff05123
RK		 1880
1881 clear_bit(NILFS_I_QUEUED, &ii->i_state);
1882 set_bit(NILFS_I_BUSY, &ii->i_state);
eaae0f37 1883 list_move_tail(&ii->i_dirty, &sci->sc_dirty_files);
9ff05123 1884 }
693dd321 1885 spin_unlock(&nilfs->ns_inode_lock);
9ff05123 1886
9ff05123
RK		 1887 return 0;
1888}
1889
693dd321
RK		 1890static void nilfs_segctor_drop_written_files(struct nilfs_sc_info *sci,
1891 struct the_nilfs *nilfs)
9ff05123
RK		 1892{
1893 struct nilfs_transaction_info *ti = current->journal_info;
1894 struct nilfs_inode_info *ii, *n;
9ff05123 1895
693dd321 1896 spin_lock(&nilfs->ns_inode_lock);
9ff05123
RK		 1897 list_for_each_entry_safe(ii, n, &sci->sc_dirty_files, i_dirty) {
1898 if (!test_and_clear_bit(NILFS_I_UPDATED, &ii->i_state) ||
6c43f410 1899 test_bit(NILFS_I_DIRTY, &ii->i_state))
9ff05123 1900 continue;
6c43f410 1901
9ff05123
RK		 1902 clear_bit(NILFS_I_BUSY, &ii->i_state);
1903 brelse(ii->i_bh);
1904 ii->i_bh = NULL;
eaae0f37 1905 list_move_tail(&ii->i_dirty, &ti->ti_garbage);
9ff05123 1906 }
693dd321 1907 spin_unlock(&nilfs->ns_inode_lock);
9ff05123
RK		 1908}
1909
9ff05123
RK		 1910/*
1911 * Main procedure of segment constructor
1912 */
1913static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
1914{
e3154e97 1915 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
1e2b68bf 1916 int err;
9ff05123
RK		 1917
1918 sci->sc_stage.scnt = NILFS_ST_INIT;
6c43f410 1919 sci->sc_cno = nilfs->ns_cno;
9ff05123 1920
693dd321 1921 err = nilfs_segctor_collect_dirty_files(sci, nilfs);
9ff05123
RK		 1922 if (unlikely(err))
1923 goto out;
1924
e912a5b6 1925 if (nilfs_test_metadata_dirty(nilfs, sci->sc_root))
9ff05123
RK		 1926 set_bit(NILFS_SC_DIRTY, &sci->sc_flags);
1927
1928 if (nilfs_segctor_clean(sci))
1929 goto out;
1930
1931 do {
1932 sci->sc_stage.flags &= ~NILFS_CF_HISTORY_MASK;
1933
1934 err = nilfs_segctor_begin_construction(sci, nilfs);
1935 if (unlikely(err))
1936 goto out;
1937
1938 /* Update time stamp */
1939 sci->sc_seg_ctime = get_seconds();
1940
1941 err = nilfs_segctor_collect(sci, nilfs, mode);
1942 if (unlikely(err))
1943 goto failed;
1944
9ff05123
RK		 1945 /* Avoid empty segment */
1946 if (sci->sc_stage.scnt == NILFS_ST_DONE &&
4762077c 1947 nilfs_segbuf_empty(sci->sc_curseg)) {
a694291a 1948 nilfs_segctor_abort_construction(sci, nilfs, 1);
9ff05123
RK		 1949 goto out;
1950 }
1951
1952 err = nilfs_segctor_assign(sci, mode);
1953 if (unlikely(err))
1954 goto failed;
1955
9ff05123 1956 if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
e912a5b6 1957 nilfs_segctor_fill_in_file_bmap(sci);
9ff05123 1958
1e2b68bf
RK		 1959 if (mode == SC_LSEG_SR &&
1960 sci->sc_stage.scnt >= NILFS_ST_CPFILE) {
9ff05123
RK		 1961 err = nilfs_segctor_fill_in_checkpoint(sci);
1962 if (unlikely(err))
a694291a 1963 goto failed_to_write;
9ff05123
RK		 1964
1965 nilfs_segctor_fill_in_super_root(sci, nilfs);
1966 }
1967 nilfs_segctor_update_segusage(sci, nilfs->ns_sufile);
1968
1969 /* Write partial segments */
1cb2d38c 1970 nilfs_segctor_prepare_write(sci);
aaed1d5b
RK		 1971
1972 nilfs_add_checksums_on_logs(&sci->sc_segbufs,
1973 nilfs->ns_crc_seed);
9ff05123 1974
9c965bac 1975 err = nilfs_segctor_write(sci, nilfs);
9ff05123
RK		 1976 if (unlikely(err))
1977 goto failed_to_write;
1978
a694291a
RK		 1979 if (sci->sc_stage.scnt == NILFS_ST_DONE ||
1980 nilfs->ns_blocksize_bits != PAGE_CACHE_SHIFT) {
1981 /*
1982 * At this point, we avoid double buffering
1983 * for blocksize < pagesize because page dirty
1984 * flag is turned off during write and dirty
1985 * buffers are not properly collected for
1986 * pages crossing over segments.
1987 */
1988 err = nilfs_segctor_wait(sci);
1989 if (err)
1990 goto failed_to_write;
1991 }
9ff05123
RK		 1992 } while (sci->sc_stage.scnt != NILFS_ST_DONE);
1993
9ff05123 1994 out:
693dd321 1995 nilfs_segctor_drop_written_files(sci, nilfs);
9ff05123
RK		 1996 return err;
1997
1998 failed_to_write:
9ff05123
RK		 1999 if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
2000 nilfs_redirty_inodes(&sci->sc_dirty_files);
9ff05123
RK		 2001
2002 failed:
2003 if (nilfs_doing_gc())
2004 nilfs_redirty_inodes(&sci->sc_gc_inodes);
a694291a 2005 nilfs_segctor_abort_construction(sci, nilfs, err);
9ff05123
RK		 2006 goto out;
2007}
2008
2009/**
9ccf56c1 2010 * nilfs_segctor_start_timer - set timer of background write
9ff05123
RK		 2011 * @sci: nilfs_sc_info
2012 *
2013 * If the timer has already been set, it ignores the new request.
2014 * This function MUST be called within a section locking the segment
2015 * semaphore.
2016 */
2017static void nilfs_segctor_start_timer(struct nilfs_sc_info *sci)
2018{
2019 spin_lock(&sci->sc_state_lock);
fdce895e
LH		 2020 if (!(sci->sc_state & NILFS_SEGCTOR_COMMIT)) {
2021 sci->sc_timer.expires = jiffies + sci->sc_interval;
2022 add_timer(&sci->sc_timer);
9ff05123
RK		 2023 sci->sc_state |= NILFS_SEGCTOR_COMMIT;
2024 }
2025 spin_unlock(&sci->sc_state_lock);
2026}
2027
2028static void nilfs_segctor_do_flush(struct nilfs_sc_info *sci, int bn)
2029{
2030 spin_lock(&sci->sc_state_lock);
2031 if (!(sci->sc_flush_request & (1 << bn))) {
2032 unsigned long prev_req = sci->sc_flush_request;
2033
2034 sci->sc_flush_request |= (1 << bn);
2035 if (!prev_req)
2036 wake_up(&sci->sc_wait_daemon);
2037 }
2038 spin_unlock(&sci->sc_state_lock);
2039}
2040
2041/**
2042 * nilfs_flush_segment - trigger a segment construction for resource control
2043 * @sb: super block
2044 * @ino: inode number of the file to be flushed out.
2045 */
2046void nilfs_flush_segment(struct super_block *sb, ino_t ino)
2047{
e3154e97 2048 struct the_nilfs *nilfs = sb->s_fs_info;
3fd3fe5a 2049 struct nilfs_sc_info *sci = nilfs->ns_writer;
9ff05123
RK		 2050
2051 if (!sci || nilfs_doing_construction())
2052 return;
2053 nilfs_segctor_do_flush(sci, NILFS_MDT_INODE(sb, ino) ? ino : 0);
2054 /* assign bit 0 to data files */
2055}
2056
9ff05123
RK		 2057struct nilfs_segctor_wait_request {
2058 wait_queue_t wq;
2059 __u32 seq;
2060 int err;
2061 atomic_t done;
2062};
2063
2064static int nilfs_segctor_sync(struct nilfs_sc_info *sci)
2065{
2066 struct nilfs_segctor_wait_request wait_req;
2067 int err = 0;
2068
2069 spin_lock(&sci->sc_state_lock);
2070 init_wait(&wait_req.wq);
2071 wait_req.err = 0;
2072 atomic_set(&wait_req.done, 0);
2073 wait_req.seq = ++sci->sc_seq_request;
2074 spin_unlock(&sci->sc_state_lock);
2075
2076 init_waitqueue_entry(&wait_req.wq, current);
2077 add_wait_queue(&sci->sc_wait_request, &wait_req.wq);
2078 set_current_state(TASK_INTERRUPTIBLE);
2079 wake_up(&sci->sc_wait_daemon);
2080
2081 for (;;) {
2082 if (atomic_read(&wait_req.done)) {
2083 err = wait_req.err;
2084 break;
2085 }
2086 if (!signal_pending(current)) {
2087 schedule();
2088 continue;
2089 }
2090 err = -ERESTARTSYS;
2091 break;
2092 }
2093 finish_wait(&sci->sc_wait_request, &wait_req.wq);
2094 return err;
2095}
2096
2097static void nilfs_segctor_wakeup(struct nilfs_sc_info *sci, int err)
2098{
2099 struct nilfs_segctor_wait_request *wrq, *n;
2100 unsigned long flags;
2101
2102 spin_lock_irqsave(&sci->sc_wait_request.lock, flags);
2103 list_for_each_entry_safe(wrq, n, &sci->sc_wait_request.task_list,
2104 wq.task_list) {
2105 if (!atomic_read(&wrq->done) &&
2106 nilfs_cnt32_ge(sci->sc_seq_done, wrq->seq)) {
2107 wrq->err = err;
2108 atomic_set(&wrq->done, 1);
2109 }
2110 if (atomic_read(&wrq->done)) {
2111 wrq->wq.func(&wrq->wq,
2112 TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE,
2113 0, NULL);
2114 }
2115 }
2116 spin_unlock_irqrestore(&sci->sc_wait_request.lock, flags);
2117}
2118
2119/**
2120 * nilfs_construct_segment - construct a logical segment
2121 * @sb: super block
2122 *
2123 * Return Value: On success, 0 is retured. On errors, one of the following
2124 * negative error code is returned.
2125 *
2126 * %-EROFS - Read only filesystem.
2127 *
2128 * %-EIO - I/O error
2129 *
2130 * %-ENOSPC - No space left on device (only in a panic state).
2131 *
2132 * %-ERESTARTSYS - Interrupted.
2133 *
2134 * %-ENOMEM - Insufficient memory available.
2135 */
2136int nilfs_construct_segment(struct super_block *sb)
2137{
e3154e97 2138 struct the_nilfs *nilfs = sb->s_fs_info;
3fd3fe5a 2139 struct nilfs_sc_info *sci = nilfs->ns_writer;
9ff05123
RK		 2140 struct nilfs_transaction_info *ti;
2141 int err;
2142
2143 if (!sci)
2144 return -EROFS;
2145
2146 /* A call inside transactions causes a deadlock. */
2147 BUG_ON((ti = current->journal_info) && ti->ti_magic == NILFS_TI_MAGIC);
2148
2149 err = nilfs_segctor_sync(sci);
2150 return err;
2151}
2152
2153/**
2154 * nilfs_construct_dsync_segment - construct a data-only logical segment
2155 * @sb: super block
f30bf3e4
RK		 2156 * @inode: inode whose data blocks should be written out
2157 * @start: start byte offset
2158 * @end: end byte offset (inclusive)
9ff05123
RK		 2159 *
2160 * Return Value: On success, 0 is retured. On errors, one of the following
2161 * negative error code is returned.
2162 *
2163 * %-EROFS - Read only filesystem.
2164 *
2165 * %-EIO - I/O error
2166 *
2167 * %-ENOSPC - No space left on device (only in a panic state).
2168 *
2169 * %-ERESTARTSYS - Interrupted.
2170 *
2171 * %-ENOMEM - Insufficient memory available.
2172 */
f30bf3e4
RK		 2173int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode,
2174 loff_t start, loff_t end)
9ff05123 2175{
e3154e97 2176 struct the_nilfs *nilfs = sb->s_fs_info;
3fd3fe5a 2177 struct nilfs_sc_info *sci = nilfs->ns_writer;
9ff05123
RK		 2178 struct nilfs_inode_info *ii;
2179 struct nilfs_transaction_info ti;
2180 int err = 0;
2181
2182 if (!sci)
2183 return -EROFS;
2184
f7545144 2185 nilfs_transaction_lock(sb, &ti, 0);
9ff05123
RK		 2186
2187 ii = NILFS_I(inode);
2188 if (test_bit(NILFS_I_INODE_DIRTY, &ii->i_state) ||
3b2ce58b 2189 nilfs_test_opt(nilfs, STRICT_ORDER) ||
9ff05123 2190 test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) ||
3b2ce58b 2191 nilfs_discontinued(nilfs)) {
f7545144 2192 nilfs_transaction_unlock(sb);
9ff05123
RK		 2193 err = nilfs_segctor_sync(sci);
2194 return err;
2195 }
2196
693dd321 2197 spin_lock(&nilfs->ns_inode_lock);
9ff05123
RK		 2198 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
2199 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
693dd321 2200 spin_unlock(&nilfs->ns_inode_lock);
f7545144 2201 nilfs_transaction_unlock(sb);
9ff05123
RK		 2202 return 0;
2203 }
693dd321 2204 spin_unlock(&nilfs->ns_inode_lock);
f30bf3e4
RK		 2205 sci->sc_dsync_inode = ii;
2206 sci->sc_dsync_start = start;
2207 sci->sc_dsync_end = end;
9ff05123
RK		 2208
2209 err = nilfs_segctor_do_construct(sci, SC_LSEG_DSYNC);
2210
f7545144 2211 nilfs_transaction_unlock(sb);
9ff05123
RK		 2212 return err;
2213}
2214
9ff05123
RK		 2215#define FLUSH_FILE_BIT (0x1) /* data file only */
2216#define FLUSH_DAT_BIT (1 << NILFS_DAT_INO) /* DAT only */
2217
dcd76186
RK		 2218/**
2219 * nilfs_segctor_accept - record accepted sequence count of log-write requests
2220 * @sci: segment constructor object
2221 */
2222static void nilfs_segctor_accept(struct nilfs_sc_info *sci)
9ff05123 2223{
9ff05123 2224 spin_lock(&sci->sc_state_lock);
dcd76186 2225 sci->sc_seq_accepted = sci->sc_seq_request;
9ff05123 2226 spin_unlock(&sci->sc_state_lock);
fdce895e 2227 del_timer_sync(&sci->sc_timer);
9ff05123
RK		 2228}
2229
dcd76186
RK		 2230/**
2231 * nilfs_segctor_notify - notify the result of request to caller threads
2232 * @sci: segment constructor object
2233 * @mode: mode of log forming
2234 * @err: error code to be notified
2235 */
2236static void nilfs_segctor_notify(struct nilfs_sc_info *sci, int mode, int err)
9ff05123
RK		 2237{
2238 /* Clear requests (even when the construction failed) */
2239 spin_lock(&sci->sc_state_lock);
2240
dcd76186 2241 if (mode == SC_LSEG_SR) {
aeda7f63 2242 sci->sc_state &= ~NILFS_SEGCTOR_COMMIT;
dcd76186
RK		 2243 sci->sc_seq_done = sci->sc_seq_accepted;
2244 nilfs_segctor_wakeup(sci, err);
9ff05123 2245 sci->sc_flush_request = 0;
aeda7f63 2246 } else {
dcd76186 2247 if (mode == SC_FLUSH_FILE)
aeda7f63 2248 sci->sc_flush_request &= ~FLUSH_FILE_BIT;
dcd76186 2249 else if (mode == SC_FLUSH_DAT)
aeda7f63
RK		 2250 sci->sc_flush_request &= ~FLUSH_DAT_BIT;
2251
2252 /* re-enable timer if checkpoint creation was not done */
fdce895e
LH		 2253 if ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
2254 time_before(jiffies, sci->sc_timer.expires))
2255 add_timer(&sci->sc_timer);
aeda7f63 2256 }
9ff05123
RK		 2257 spin_unlock(&sci->sc_state_lock);
2258}
2259
dcd76186
RK		 2260/**
2261 * nilfs_segctor_construct - form logs and write them to disk
2262 * @sci: segment constructor object
2263 * @mode: mode of log forming
2264 */
2265static int nilfs_segctor_construct(struct nilfs_sc_info *sci, int mode)
9ff05123 2266{
e3154e97 2267 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
d26493b6 2268 struct nilfs_super_block **sbp;
9ff05123
RK		 2269 int err = 0;
2270
dcd76186
RK		 2271 nilfs_segctor_accept(sci);
2272
9ff05123 2273 if (nilfs_discontinued(nilfs))
dcd76186
RK		 2274 mode = SC_LSEG_SR;
2275 if (!nilfs_segctor_confirm(sci))
2276 err = nilfs_segctor_do_construct(sci, mode);
2277
9ff05123 2278 if (likely(!err)) {
dcd76186 2279 if (mode != SC_FLUSH_DAT)
9ff05123
RK		 2280 atomic_set(&nilfs->ns_ndirtyblks, 0);
2281 if (test_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags) &&
2282 nilfs_discontinued(nilfs)) {
2283 down_write(&nilfs->ns_sem);
d26493b6 2284 err = -EIO;
f7545144 2285 sbp = nilfs_prepare_super(sci->sc_super,
b2ac86e1
JS		 2286 nilfs_sb_will_flip(nilfs));
2287 if (likely(sbp)) {
2288 nilfs_set_log_cursor(sbp[0], nilfs);
f7545144
RK		 2289 err = nilfs_commit_super(sci->sc_super,
2290 NILFS_SB_COMMIT);
b2ac86e1 2291 }
9ff05123
RK		 2292 up_write(&nilfs->ns_sem);
2293 }
2294 }
dcd76186
RK		 2295
2296 nilfs_segctor_notify(sci, mode, err);
9ff05123
RK		 2297 return err;
2298}
2299
2300static void nilfs_construction_timeout(unsigned long data)
2301{
2302 struct task_struct *p = (struct task_struct *)data;
2303 wake_up_process(p);
2304}
2305
2306static void
2307nilfs_remove_written_gcinodes(struct the_nilfs *nilfs, struct list_head *head)
2308{
2309 struct nilfs_inode_info *ii, *n;
2310
2311 list_for_each_entry_safe(ii, n, head, i_dirty) {
2312 if (!test_bit(NILFS_I_UPDATED, &ii->i_state))
2313 continue;
9ff05123 2314 list_del_init(&ii->i_dirty);
263d90ce 2315 iput(&ii->vfs_inode);
9ff05123
RK		 2316 }
2317}
2318
4f6b8288
RK		 2319int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv,
2320 void **kbufs)
9ff05123 2321{
e3154e97 2322 struct the_nilfs *nilfs = sb->s_fs_info;
3fd3fe5a 2323 struct nilfs_sc_info *sci = nilfs->ns_writer;
9ff05123 2324 struct nilfs_transaction_info ti;
9ff05123
RK		 2325 int err;
2326
2327 if (unlikely(!sci))
2328 return -EROFS;
2329
f7545144 2330 nilfs_transaction_lock(sb, &ti, 1);
9ff05123 2331
c1c1d709 2332 err = nilfs_mdt_save_to_shadow_map(nilfs->ns_dat);
9ff05123
RK		 2333 if (unlikely(err))
2334 goto out_unlock;
071cb4b8 2335
4f6b8288 2336 err = nilfs_ioctl_prepare_clean_segments(nilfs, argv, kbufs);
c1c1d709
RK		 2337 if (unlikely(err)) {
2338 nilfs_mdt_restore_from_shadow_map(nilfs->ns_dat);
9ff05123 2339 goto out_unlock;
c1c1d709 2340 }
9ff05123 2341
071cb4b8
RK		 2342 sci->sc_freesegs = kbufs[4];
2343 sci->sc_nfreesegs = argv[4].v_nmembs;
0935db74 2344 list_splice_tail_init(&nilfs->ns_gc_inodes, &sci->sc_gc_inodes);
9ff05123
RK		 2345
2346 for (;;) {
dcd76186 2347 err = nilfs_segctor_construct(sci, SC_LSEG_SR);
9ff05123 2348 nilfs_remove_written_gcinodes(nilfs, &sci->sc_gc_inodes);
9ff05123
RK		 2349
2350 if (likely(!err))
2351 break;
2352
2353 nilfs_warning(sb, __func__,
2354 "segment construction failed. (err=%d)", err);
2355 set_current_state(TASK_INTERRUPTIBLE);
2356 schedule_timeout(sci->sc_interval);
2357 }
3b2ce58b 2358 if (nilfs_test_opt(nilfs, DISCARD)) {
e902ec99
JS		 2359 int ret = nilfs_discard_segments(nilfs, sci->sc_freesegs,
2360 sci->sc_nfreesegs);
2361 if (ret) {
2362 printk(KERN_WARNING
2363 "NILFS warning: error %d on discard request, "
2364 "turning discards off for the device\n", ret);
3b2ce58b 2365 nilfs_clear_opt(nilfs, DISCARD);
e902ec99
JS		 2366 }
2367 }
9ff05123
RK		 2368
2369 out_unlock:
071cb4b8
RK		 2370 sci->sc_freesegs = NULL;
2371 sci->sc_nfreesegs = 0;
c1c1d709 2372 nilfs_mdt_clear_shadow_map(nilfs->ns_dat);
f7545144 2373 nilfs_transaction_unlock(sb);
9ff05123
RK		 2374 return err;
2375}
2376
2377static void nilfs_segctor_thread_construct(struct nilfs_sc_info *sci, int mode)
2378{
9ff05123 2379 struct nilfs_transaction_info ti;
9ff05123 2380
f7545144 2381 nilfs_transaction_lock(sci->sc_super, &ti, 0);
dcd76186 2382 nilfs_segctor_construct(sci, mode);
9ff05123
RK		 2383
2384 /*
2385 * Unclosed segment should be retried. We do this using sc_timer.
2386 * Timeout of sc_timer will invoke complete construction which leads
2387 * to close the current logical segment.
2388 */
2389 if (test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags))
2390 nilfs_segctor_start_timer(sci);
2391
f7545144 2392 nilfs_transaction_unlock(sci->sc_super);
9ff05123
RK		 2393}
2394
2395static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *sci)
2396{
2397 int mode = 0;
2398 int err;
2399
2400 spin_lock(&sci->sc_state_lock);
2401 mode = (sci->sc_flush_request & FLUSH_DAT_BIT) ?
2402 SC_FLUSH_DAT : SC_FLUSH_FILE;
2403 spin_unlock(&sci->sc_state_lock);
2404
2405 if (mode) {
2406 err = nilfs_segctor_do_construct(sci, mode);
2407
2408 spin_lock(&sci->sc_state_lock);
2409 sci->sc_flush_request &= (mode == SC_FLUSH_FILE) ?
2410 ~FLUSH_FILE_BIT : ~FLUSH_DAT_BIT;
2411 spin_unlock(&sci->sc_state_lock);
2412 }
2413 clear_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags);
2414}
2415
2416static int nilfs_segctor_flush_mode(struct nilfs_sc_info *sci)
2417{
2418 if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) ||
2419 time_before(jiffies, sci->sc_lseg_stime + sci->sc_mjcp_freq)) {
2420 if (!(sci->sc_flush_request & ~FLUSH_FILE_BIT))
2421 return SC_FLUSH_FILE;
2422 else if (!(sci->sc_flush_request & ~FLUSH_DAT_BIT))
2423 return SC_FLUSH_DAT;
2424 }
2425 return SC_LSEG_SR;
2426}
2427
2428/**
2429 * nilfs_segctor_thread - main loop of the segment constructor thread.
2430 * @arg: pointer to a struct nilfs_sc_info.
2431 *
2432 * nilfs_segctor_thread() initializes a timer and serves as a daemon
2433 * to execute segment constructions.
2434 */
2435static int nilfs_segctor_thread(void *arg)
2436{
2437 struct nilfs_sc_info *sci = (struct nilfs_sc_info *)arg;
e3154e97 2438 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
9ff05123
RK		 2439 int timeout = 0;
2440
fdce895e
LH		 2441 sci->sc_timer.data = (unsigned long)current;
2442 sci->sc_timer.function = nilfs_construction_timeout;
9ff05123
RK		 2443
2444 /* start sync. */
2445 sci->sc_task = current;
2446 wake_up(&sci->sc_wait_task); /* for nilfs_segctor_start_thread() */
2447 printk(KERN_INFO
2448 "segctord starting. Construction interval = %lu seconds, "
2449 "CP frequency < %lu seconds\n",
2450 sci->sc_interval / HZ, sci->sc_mjcp_freq / HZ);
2451
2452 spin_lock(&sci->sc_state_lock);
2453 loop:
2454 for (;;) {
2455 int mode;
2456
2457 if (sci->sc_state & NILFS_SEGCTOR_QUIT)
2458 goto end_thread;
2459
2460 if (timeout || sci->sc_seq_request != sci->sc_seq_done)
2461 mode = SC_LSEG_SR;
2462 else if (!sci->sc_flush_request)
2463 break;
2464 else
2465 mode = nilfs_segctor_flush_mode(sci);
2466
2467 spin_unlock(&sci->sc_state_lock);
2468 nilfs_segctor_thread_construct(sci, mode);
2469 spin_lock(&sci->sc_state_lock);
2470 timeout = 0;
2471 }
2472
2473
2474 if (freezing(current)) {
2475 spin_unlock(&sci->sc_state_lock);
2476 refrigerator();
2477 spin_lock(&sci->sc_state_lock);
2478 } else {
2479 DEFINE_WAIT(wait);
2480 int should_sleep = 1;
2481
2482 prepare_to_wait(&sci->sc_wait_daemon, &wait,
2483 TASK_INTERRUPTIBLE);
2484
2485 if (sci->sc_seq_request != sci->sc_seq_done)
2486 should_sleep = 0;
2487 else if (sci->sc_flush_request)
2488 should_sleep = 0;
2489 else if (sci->sc_state & NILFS_SEGCTOR_COMMIT)
2490 should_sleep = time_before(jiffies,
fdce895e 2491 sci->sc_timer.expires);
9ff05123
RK		 2492
2493 if (should_sleep) {
2494 spin_unlock(&sci->sc_state_lock);
2495 schedule();
2496 spin_lock(&sci->sc_state_lock);
2497 }
2498 finish_wait(&sci->sc_wait_daemon, &wait);
2499 timeout = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
fdce895e 2500 time_after_eq(jiffies, sci->sc_timer.expires));
e605f0a7
RK		 2501
2502 if (nilfs_sb_dirty(nilfs) && nilfs_sb_need_update(nilfs))
1dfa2710 2503 set_nilfs_discontinued(nilfs);
9ff05123
RK		 2504 }
2505 goto loop;
2506
2507 end_thread:
2508 spin_unlock(&sci->sc_state_lock);
9ff05123
RK		 2509
2510 /* end sync. */
2511 sci->sc_task = NULL;
2512 wake_up(&sci->sc_wait_task); /* for nilfs_segctor_kill_thread() */
2513 return 0;
2514}
2515
2516static int nilfs_segctor_start_thread(struct nilfs_sc_info *sci)
2517{
2518 struct task_struct *t;
2519
2520 t = kthread_run(nilfs_segctor_thread, sci, "segctord");
2521 if (IS_ERR(t)) {
2522 int err = PTR_ERR(t);
2523
2524 printk(KERN_ERR "NILFS: error %d creating segctord thread\n",
2525 err);
2526 return err;
2527 }
2528 wait_event(sci->sc_wait_task, sci->sc_task != NULL);
2529 return 0;
2530}
2531
2532static void nilfs_segctor_kill_thread(struct nilfs_sc_info *sci)
6b81e14e
JS		 2533 __acquires(&sci->sc_state_lock)
2534 __releases(&sci->sc_state_lock)
9ff05123
RK		 2535{
2536 sci->sc_state |= NILFS_SEGCTOR_QUIT;
2537
2538 while (sci->sc_task) {
2539 wake_up(&sci->sc_wait_daemon);
2540 spin_unlock(&sci->sc_state_lock);
2541 wait_event(sci->sc_wait_task, sci->sc_task == NULL);
2542 spin_lock(&sci->sc_state_lock);
2543 }
2544}
2545
9ff05123
RK		 2546/*
2547 * Setup & clean-up functions
2548 */
f7545144 2549static struct nilfs_sc_info *nilfs_segctor_new(struct super_block *sb,
e912a5b6 2550 struct nilfs_root *root)
9ff05123 2551{
e3154e97 2552 struct the_nilfs *nilfs = sb->s_fs_info;
9ff05123
RK		 2553 struct nilfs_sc_info *sci;
2554
2555 sci = kzalloc(sizeof(*sci), GFP_KERNEL);
2556 if (!sci)
2557 return NULL;
2558
f7545144 2559 sci->sc_super = sb;
9ff05123 2560
e912a5b6
RK		 2561 nilfs_get_root(root);
2562 sci->sc_root = root;
2563
9ff05123
RK		 2564 init_waitqueue_head(&sci->sc_wait_request);
2565 init_waitqueue_head(&sci->sc_wait_daemon);
2566 init_waitqueue_head(&sci->sc_wait_task);
2567 spin_lock_init(&sci->sc_state_lock);
2568 INIT_LIST_HEAD(&sci->sc_dirty_files);
2569 INIT_LIST_HEAD(&sci->sc_segbufs);
a694291a 2570 INIT_LIST_HEAD(&sci->sc_write_logs);
9ff05123 2571 INIT_LIST_HEAD(&sci->sc_gc_inodes);
fdce895e 2572 init_timer(&sci->sc_timer);
9ff05123
RK		 2573
2574 sci->sc_interval = HZ * NILFS_SC_DEFAULT_TIMEOUT;
2575 sci->sc_mjcp_freq = HZ * NILFS_SC_DEFAULT_SR_FREQ;
2576 sci->sc_watermark = NILFS_SC_DEFAULT_WATERMARK;
2577
574e6c31
RK		 2578 if (nilfs->ns_interval)
2579 sci->sc_interval = nilfs->ns_interval;
2580 if (nilfs->ns_watermark)
2581 sci->sc_watermark = nilfs->ns_watermark;
9ff05123
RK		 2582 return sci;
2583}
2584
2585static void nilfs_segctor_write_out(struct nilfs_sc_info *sci)
2586{
2587 int ret, retrycount = NILFS_SC_CLEANUP_RETRY;
2588
2589 /* The segctord thread was stopped and its timer was removed.
2590 But some tasks remain. */
2591 do {
9ff05123 2592 struct nilfs_transaction_info ti;
9ff05123 2593
f7545144 2594 nilfs_transaction_lock(sci->sc_super, &ti, 0);
dcd76186 2595 ret = nilfs_segctor_construct(sci, SC_LSEG_SR);
f7545144 2596 nilfs_transaction_unlock(sci->sc_super);
9ff05123
RK		 2597
2598 } while (ret && retrycount-- > 0);
2599}
2600
2601/**
2602 * nilfs_segctor_destroy - destroy the segment constructor.
2603 * @sci: nilfs_sc_info
2604 *
2605 * nilfs_segctor_destroy() kills the segctord thread and frees
2606 * the nilfs_sc_info struct.
2607 * Caller must hold the segment semaphore.
2608 */
2609static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
2610{
e3154e97 2611 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
9ff05123
RK		 2612 int flag;
2613
693dd321 2614 up_write(&nilfs->ns_segctor_sem);
9ff05123
RK		 2615
2616 spin_lock(&sci->sc_state_lock);
2617 nilfs_segctor_kill_thread(sci);
2618 flag = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) || sci->sc_flush_request
2619 || sci->sc_seq_request != sci->sc_seq_done);
2620 spin_unlock(&sci->sc_state_lock);
2621
3256a055 2622 if (flag || !nilfs_segctor_confirm(sci))
9ff05123
RK		 2623 nilfs_segctor_write_out(sci);
2624
9ff05123 2625 if (!list_empty(&sci->sc_dirty_files)) {
693dd321 2626 nilfs_warning(sci->sc_super, __func__,
9ff05123 2627 "dirty file(s) after the final construction\n");
693dd321 2628 nilfs_dispose_list(nilfs, &sci->sc_dirty_files, 1);
9ff05123 2629 }
9ff05123 2630
1f5abe7e 2631 WARN_ON(!list_empty(&sci->sc_segbufs));
a694291a 2632 WARN_ON(!list_empty(&sci->sc_write_logs));
9ff05123 2633
e912a5b6
RK		 2634 nilfs_put_root(sci->sc_root);
2635
693dd321 2636 down_write(&nilfs->ns_segctor_sem);
9ff05123 2637
fdce895e 2638 del_timer_sync(&sci->sc_timer);
9ff05123
RK		 2639 kfree(sci);
2640}
2641
2642/**
f7545144
RK		 2643 * nilfs_attach_log_writer - attach log writer
2644 * @sb: super block instance
e912a5b6 2645 * @root: root object of the current filesystem tree
9ff05123 2646 *
f7545144
RK		 2647 * This allocates a log writer object, initializes it, and starts the
2648 * log writer.
9ff05123
RK		 2649 *
2650 * Return Value: On success, 0 is returned. On error, one of the following
2651 * negative error code is returned.
2652 *
2653 * %-ENOMEM - Insufficient memory available.
2654 */
f7545144 2655int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root)
9ff05123 2656{
e3154e97 2657 struct the_nilfs *nilfs = sb->s_fs_info;
9ff05123
RK		 2658 int err;
2659
3fd3fe5a 2660 if (nilfs->ns_writer) {
fe5f171b
RK		 2661 /*
2662 * This happens if the filesystem was remounted
2663 * read/write after nilfs_error degenerated it into a
2664 * read-only mount.
2665 */
f7545144 2666 nilfs_detach_log_writer(sb);
fe5f171b
RK		 2667 }
2668
f7545144 2669 nilfs->ns_writer = nilfs_segctor_new(sb, root);
3fd3fe5a 2670 if (!nilfs->ns_writer)
9ff05123
RK		 2671 return -ENOMEM;
2672
3fd3fe5a 2673 err = nilfs_segctor_start_thread(nilfs->ns_writer);
9ff05123 2674 if (err) {
3fd3fe5a
RK		 2675 kfree(nilfs->ns_writer);
2676 nilfs->ns_writer = NULL;
9ff05123
RK		 2677 }
2678 return err;
2679}
2680
2681/**
f7545144
RK		 2682 * nilfs_detach_log_writer - destroy log writer
2683 * @sb: super block instance
9ff05123 2684 *
f7545144
RK		 2685 * This kills log writer daemon, frees the log writer object, and
2686 * destroys list of dirty files.
9ff05123 2687 */
f7545144 2688void nilfs_detach_log_writer(struct super_block *sb)
9ff05123 2689{
e3154e97 2690 struct the_nilfs *nilfs = sb->s_fs_info;
9ff05123
RK		 2691 LIST_HEAD(garbage_list);
2692
2693 down_write(&nilfs->ns_segctor_sem);
3fd3fe5a
RK		 2694 if (nilfs->ns_writer) {
2695 nilfs_segctor_destroy(nilfs->ns_writer);
2696 nilfs->ns_writer = NULL;
9ff05123
RK		 2697 }
2698
2699 /* Force to free the list of dirty files */
693dd321
RK		 2700 spin_lock(&nilfs->ns_inode_lock);
2701 if (!list_empty(&nilfs->ns_dirty_files)) {
2702 list_splice_init(&nilfs->ns_dirty_files, &garbage_list);
f7545144
RK		 2703 nilfs_warning(sb, __func__,
2704 "Hit dirty file after stopped log writer\n");
9ff05123 2705 }
693dd321 2706 spin_unlock(&nilfs->ns_inode_lock);
9ff05123
RK		 2707 up_write(&nilfs->ns_segctor_sem);
2708
693dd321 2709 nilfs_dispose_list(nilfs, &garbage_list, 1);
9ff05123 2710}
Linux 6.x block layer and io_uring tree(s)