2 * segment.c - NILFS segment constructor.
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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.
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.
16 * Written by Ryusuke Konishi.
20 #include <linux/pagemap.h>
21 #include <linux/buffer_head.h>
22 #include <linux/writeback.h>
23 #include <linux/bitops.h>
24 #include <linux/bio.h>
25 #include <linux/completion.h>
26 #include <linux/blkdev.h>
27 #include <linux/backing-dev.h>
28 #include <linux/freezer.h>
29 #include <linux/kthread.h>
30 #include <linux/crc32.h>
31 #include <linux/pagevec.h>
32 #include <linux/slab.h>
33 #include <linux/sched/signal.h>
48 #define SC_N_INODEVEC 16 /* Size of locally allocated inode vector */
50 #define SC_MAX_SEGDELTA 64 /*
51 * Upper limit of the number of segments
52 * appended in collection retry loop
55 /* Construction mode */
57 SC_LSEG_SR
= 1, /* Make a logical segment having a super root */
59 * Flush data blocks of a given file and make
60 * a logical segment without a super root.
63 * Flush data files, leads to segment writes without
64 * creating a checkpoint.
67 * Flush DAT file. This also creates segments
68 * without a checkpoint.
72 /* Stage numbers of dirty block collection */
75 NILFS_ST_GC
, /* Collecting dirty blocks for GC */
81 NILFS_ST_SR
, /* Super root */
82 NILFS_ST_DSYNC
, /* Data sync blocks */
86 #define CREATE_TRACE_POINTS
87 #include <trace/events/nilfs2.h>
90 * nilfs_sc_cstage_inc(), nilfs_sc_cstage_set(), nilfs_sc_cstage_get() are
91 * wrapper functions of stage count (nilfs_sc_info->sc_stage.scnt). Users of
92 * the variable must use them because transition of stage count must involve
93 * trace events (trace_nilfs2_collection_stage_transition).
95 * nilfs_sc_cstage_get() isn't required for the above purpose because it doesn't
96 * produce tracepoint events. It is provided just for making the intention
99 static inline void nilfs_sc_cstage_inc(struct nilfs_sc_info
*sci
)
101 sci
->sc_stage
.scnt
++;
102 trace_nilfs2_collection_stage_transition(sci
);
105 static inline void nilfs_sc_cstage_set(struct nilfs_sc_info
*sci
, int next_scnt
)
107 sci
->sc_stage
.scnt
= next_scnt
;
108 trace_nilfs2_collection_stage_transition(sci
);
111 static inline int nilfs_sc_cstage_get(struct nilfs_sc_info
*sci
)
113 return sci
->sc_stage
.scnt
;
116 /* State flags of collection */
117 #define NILFS_CF_NODE 0x0001 /* Collecting node blocks */
118 #define NILFS_CF_IFILE_STARTED 0x0002 /* IFILE stage has started */
119 #define NILFS_CF_SUFREED 0x0004 /* segment usages has been freed */
120 #define NILFS_CF_HISTORY_MASK (NILFS_CF_IFILE_STARTED | NILFS_CF_SUFREED)
122 /* Operations depending on the construction mode and file type */
123 struct nilfs_sc_operations
{
124 int (*collect_data
)(struct nilfs_sc_info
*, struct buffer_head
*,
126 int (*collect_node
)(struct nilfs_sc_info
*, struct buffer_head
*,
128 int (*collect_bmap
)(struct nilfs_sc_info
*, struct buffer_head
*,
130 void (*write_data_binfo
)(struct nilfs_sc_info
*,
131 struct nilfs_segsum_pointer
*,
132 union nilfs_binfo
*);
133 void (*write_node_binfo
)(struct nilfs_sc_info
*,
134 struct nilfs_segsum_pointer
*,
135 union nilfs_binfo
*);
141 static void nilfs_segctor_start_timer(struct nilfs_sc_info
*);
142 static void nilfs_segctor_do_flush(struct nilfs_sc_info
*, int);
143 static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info
*);
144 static void nilfs_dispose_list(struct the_nilfs
*, struct list_head
*, int);
146 #define nilfs_cnt32_gt(a, b) \
147 (typecheck(__u32, a) && typecheck(__u32, b) && \
148 ((__s32)(b) - (__s32)(a) < 0))
149 #define nilfs_cnt32_ge(a, b) \
150 (typecheck(__u32, a) && typecheck(__u32, b) && \
151 ((__s32)(a) - (__s32)(b) >= 0))
152 #define nilfs_cnt32_lt(a, b) nilfs_cnt32_gt(b, a)
153 #define nilfs_cnt32_le(a, b) nilfs_cnt32_ge(b, a)
155 static int nilfs_prepare_segment_lock(struct super_block
*sb
,
156 struct nilfs_transaction_info
*ti
)
158 struct nilfs_transaction_info
*cur_ti
= current
->journal_info
;
162 if (cur_ti
->ti_magic
== NILFS_TI_MAGIC
)
163 return ++cur_ti
->ti_count
;
166 * If journal_info field is occupied by other FS,
167 * it is saved and will be restored on
168 * nilfs_transaction_commit().
170 nilfs_msg(sb
, KERN_WARNING
, "journal info from a different FS");
171 save
= current
->journal_info
;
174 ti
= kmem_cache_alloc(nilfs_transaction_cachep
, GFP_NOFS
);
177 ti
->ti_flags
= NILFS_TI_DYNAMIC_ALLOC
;
183 ti
->ti_magic
= NILFS_TI_MAGIC
;
184 current
->journal_info
= ti
;
189 * nilfs_transaction_begin - start indivisible file operations.
191 * @ti: nilfs_transaction_info
192 * @vacancy_check: flags for vacancy rate checks
194 * nilfs_transaction_begin() acquires a reader/writer semaphore, called
195 * the segment semaphore, to make a segment construction and write tasks
196 * exclusive. The function is used with nilfs_transaction_commit() in pairs.
197 * The region enclosed by these two functions can be nested. To avoid a
198 * deadlock, the semaphore is only acquired or released in the outermost call.
200 * This function allocates a nilfs_transaction_info struct to keep context
201 * information on it. It is initialized and hooked onto the current task in
202 * the outermost call. If a pre-allocated struct is given to @ti, it is used
203 * instead; otherwise a new struct is assigned from a slab.
205 * When @vacancy_check flag is set, this function will check the amount of
206 * free space, and will wait for the GC to reclaim disk space if low capacity.
208 * Return Value: On success, 0 is returned. On error, one of the following
209 * negative error code is returned.
211 * %-ENOMEM - Insufficient memory available.
213 * %-ENOSPC - No space left on device
215 int nilfs_transaction_begin(struct super_block
*sb
,
216 struct nilfs_transaction_info
*ti
,
219 struct the_nilfs
*nilfs
;
220 int ret
= nilfs_prepare_segment_lock(sb
, ti
);
221 struct nilfs_transaction_info
*trace_ti
;
223 if (unlikely(ret
< 0))
226 trace_ti
= current
->journal_info
;
228 trace_nilfs2_transaction_transition(sb
, trace_ti
,
229 trace_ti
->ti_count
, trace_ti
->ti_flags
,
230 TRACE_NILFS2_TRANSACTION_BEGIN
);
234 sb_start_intwrite(sb
);
236 nilfs
= sb
->s_fs_info
;
237 down_read(&nilfs
->ns_segctor_sem
);
238 if (vacancy_check
&& nilfs_near_disk_full(nilfs
)) {
239 up_read(&nilfs
->ns_segctor_sem
);
244 trace_ti
= current
->journal_info
;
245 trace_nilfs2_transaction_transition(sb
, trace_ti
, trace_ti
->ti_count
,
247 TRACE_NILFS2_TRANSACTION_BEGIN
);
251 ti
= current
->journal_info
;
252 current
->journal_info
= ti
->ti_save
;
253 if (ti
->ti_flags
& NILFS_TI_DYNAMIC_ALLOC
)
254 kmem_cache_free(nilfs_transaction_cachep
, ti
);
260 * nilfs_transaction_commit - commit indivisible file operations.
263 * nilfs_transaction_commit() releases the read semaphore which is
264 * acquired by nilfs_transaction_begin(). This is only performed
265 * in outermost call of this function. If a commit flag is set,
266 * nilfs_transaction_commit() sets a timer to start the segment
267 * constructor. If a sync flag is set, it starts construction
270 int nilfs_transaction_commit(struct super_block
*sb
)
272 struct nilfs_transaction_info
*ti
= current
->journal_info
;
273 struct the_nilfs
*nilfs
= sb
->s_fs_info
;
276 BUG_ON(ti
== NULL
|| ti
->ti_magic
!= NILFS_TI_MAGIC
);
277 ti
->ti_flags
|= NILFS_TI_COMMIT
;
278 if (ti
->ti_count
> 0) {
280 trace_nilfs2_transaction_transition(sb
, ti
, ti
->ti_count
,
281 ti
->ti_flags
, TRACE_NILFS2_TRANSACTION_COMMIT
);
284 if (nilfs
->ns_writer
) {
285 struct nilfs_sc_info
*sci
= nilfs
->ns_writer
;
287 if (ti
->ti_flags
& NILFS_TI_COMMIT
)
288 nilfs_segctor_start_timer(sci
);
289 if (atomic_read(&nilfs
->ns_ndirtyblks
) > sci
->sc_watermark
)
290 nilfs_segctor_do_flush(sci
, 0);
292 up_read(&nilfs
->ns_segctor_sem
);
293 trace_nilfs2_transaction_transition(sb
, ti
, ti
->ti_count
,
294 ti
->ti_flags
, TRACE_NILFS2_TRANSACTION_COMMIT
);
296 current
->journal_info
= ti
->ti_save
;
298 if (ti
->ti_flags
& NILFS_TI_SYNC
)
299 err
= nilfs_construct_segment(sb
);
300 if (ti
->ti_flags
& NILFS_TI_DYNAMIC_ALLOC
)
301 kmem_cache_free(nilfs_transaction_cachep
, ti
);
306 void nilfs_transaction_abort(struct super_block
*sb
)
308 struct nilfs_transaction_info
*ti
= current
->journal_info
;
309 struct the_nilfs
*nilfs
= sb
->s_fs_info
;
311 BUG_ON(ti
== NULL
|| ti
->ti_magic
!= NILFS_TI_MAGIC
);
312 if (ti
->ti_count
> 0) {
314 trace_nilfs2_transaction_transition(sb
, ti
, ti
->ti_count
,
315 ti
->ti_flags
, TRACE_NILFS2_TRANSACTION_ABORT
);
318 up_read(&nilfs
->ns_segctor_sem
);
320 trace_nilfs2_transaction_transition(sb
, ti
, ti
->ti_count
,
321 ti
->ti_flags
, TRACE_NILFS2_TRANSACTION_ABORT
);
323 current
->journal_info
= ti
->ti_save
;
324 if (ti
->ti_flags
& NILFS_TI_DYNAMIC_ALLOC
)
325 kmem_cache_free(nilfs_transaction_cachep
, ti
);
329 void nilfs_relax_pressure_in_lock(struct super_block
*sb
)
331 struct the_nilfs
*nilfs
= sb
->s_fs_info
;
332 struct nilfs_sc_info
*sci
= nilfs
->ns_writer
;
334 if (!sci
|| !sci
->sc_flush_request
)
337 set_bit(NILFS_SC_PRIOR_FLUSH
, &sci
->sc_flags
);
338 up_read(&nilfs
->ns_segctor_sem
);
340 down_write(&nilfs
->ns_segctor_sem
);
341 if (sci
->sc_flush_request
&&
342 test_bit(NILFS_SC_PRIOR_FLUSH
, &sci
->sc_flags
)) {
343 struct nilfs_transaction_info
*ti
= current
->journal_info
;
345 ti
->ti_flags
|= NILFS_TI_WRITER
;
346 nilfs_segctor_do_immediate_flush(sci
);
347 ti
->ti_flags
&= ~NILFS_TI_WRITER
;
349 downgrade_write(&nilfs
->ns_segctor_sem
);
352 static void nilfs_transaction_lock(struct super_block
*sb
,
353 struct nilfs_transaction_info
*ti
,
356 struct nilfs_transaction_info
*cur_ti
= current
->journal_info
;
357 struct the_nilfs
*nilfs
= sb
->s_fs_info
;
358 struct nilfs_sc_info
*sci
= nilfs
->ns_writer
;
361 ti
->ti_flags
= NILFS_TI_WRITER
;
363 ti
->ti_save
= cur_ti
;
364 ti
->ti_magic
= NILFS_TI_MAGIC
;
365 current
->journal_info
= ti
;
368 trace_nilfs2_transaction_transition(sb
, ti
, ti
->ti_count
,
369 ti
->ti_flags
, TRACE_NILFS2_TRANSACTION_TRYLOCK
);
371 down_write(&nilfs
->ns_segctor_sem
);
372 if (!test_bit(NILFS_SC_PRIOR_FLUSH
, &sci
->sc_flags
))
375 nilfs_segctor_do_immediate_flush(sci
);
377 up_write(&nilfs
->ns_segctor_sem
);
381 ti
->ti_flags
|= NILFS_TI_GC
;
383 trace_nilfs2_transaction_transition(sb
, ti
, ti
->ti_count
,
384 ti
->ti_flags
, TRACE_NILFS2_TRANSACTION_LOCK
);
387 static void nilfs_transaction_unlock(struct super_block
*sb
)
389 struct nilfs_transaction_info
*ti
= current
->journal_info
;
390 struct the_nilfs
*nilfs
= sb
->s_fs_info
;
392 BUG_ON(ti
== NULL
|| ti
->ti_magic
!= NILFS_TI_MAGIC
);
393 BUG_ON(ti
->ti_count
> 0);
395 up_write(&nilfs
->ns_segctor_sem
);
396 current
->journal_info
= ti
->ti_save
;
398 trace_nilfs2_transaction_transition(sb
, ti
, ti
->ti_count
,
399 ti
->ti_flags
, TRACE_NILFS2_TRANSACTION_UNLOCK
);
402 static void *nilfs_segctor_map_segsum_entry(struct nilfs_sc_info
*sci
,
403 struct nilfs_segsum_pointer
*ssp
,
406 struct nilfs_segment_buffer
*segbuf
= sci
->sc_curseg
;
407 unsigned int blocksize
= sci
->sc_super
->s_blocksize
;
410 if (unlikely(ssp
->offset
+ bytes
> blocksize
)) {
412 BUG_ON(NILFS_SEGBUF_BH_IS_LAST(ssp
->bh
,
413 &segbuf
->sb_segsum_buffers
));
414 ssp
->bh
= NILFS_SEGBUF_NEXT_BH(ssp
->bh
);
416 p
= ssp
->bh
->b_data
+ ssp
->offset
;
417 ssp
->offset
+= bytes
;
422 * nilfs_segctor_reset_segment_buffer - reset the current segment buffer
423 * @sci: nilfs_sc_info
425 static int nilfs_segctor_reset_segment_buffer(struct nilfs_sc_info
*sci
)
427 struct nilfs_segment_buffer
*segbuf
= sci
->sc_curseg
;
428 struct buffer_head
*sumbh
;
429 unsigned int sumbytes
;
430 unsigned int flags
= 0;
433 if (nilfs_doing_gc())
435 err
= nilfs_segbuf_reset(segbuf
, flags
, sci
->sc_seg_ctime
, sci
->sc_cno
);
439 sumbh
= NILFS_SEGBUF_FIRST_BH(&segbuf
->sb_segsum_buffers
);
440 sumbytes
= segbuf
->sb_sum
.sumbytes
;
441 sci
->sc_finfo_ptr
.bh
= sumbh
; sci
->sc_finfo_ptr
.offset
= sumbytes
;
442 sci
->sc_binfo_ptr
.bh
= sumbh
; sci
->sc_binfo_ptr
.offset
= sumbytes
;
443 sci
->sc_blk_cnt
= sci
->sc_datablk_cnt
= 0;
447 static int nilfs_segctor_feed_segment(struct nilfs_sc_info
*sci
)
449 sci
->sc_nblk_this_inc
+= sci
->sc_curseg
->sb_sum
.nblocks
;
450 if (NILFS_SEGBUF_IS_LAST(sci
->sc_curseg
, &sci
->sc_segbufs
))
452 * The current segment is filled up
455 sci
->sc_curseg
= NILFS_NEXT_SEGBUF(sci
->sc_curseg
);
456 return nilfs_segctor_reset_segment_buffer(sci
);
459 static int nilfs_segctor_add_super_root(struct nilfs_sc_info
*sci
)
461 struct nilfs_segment_buffer
*segbuf
= sci
->sc_curseg
;
464 if (segbuf
->sb_sum
.nblocks
>= segbuf
->sb_rest_blocks
) {
465 err
= nilfs_segctor_feed_segment(sci
);
468 segbuf
= sci
->sc_curseg
;
470 err
= nilfs_segbuf_extend_payload(segbuf
, &segbuf
->sb_super_root
);
472 segbuf
->sb_sum
.flags
|= NILFS_SS_SR
;
477 * Functions for making segment summary and payloads
479 static int nilfs_segctor_segsum_block_required(
480 struct nilfs_sc_info
*sci
, const struct nilfs_segsum_pointer
*ssp
,
481 unsigned int binfo_size
)
483 unsigned int blocksize
= sci
->sc_super
->s_blocksize
;
484 /* Size of finfo and binfo is enough small against blocksize */
486 return ssp
->offset
+ binfo_size
+
487 (!sci
->sc_blk_cnt
? sizeof(struct nilfs_finfo
) : 0) >
491 static void nilfs_segctor_begin_finfo(struct nilfs_sc_info
*sci
,
494 sci
->sc_curseg
->sb_sum
.nfinfo
++;
495 sci
->sc_binfo_ptr
= sci
->sc_finfo_ptr
;
496 nilfs_segctor_map_segsum_entry(
497 sci
, &sci
->sc_binfo_ptr
, sizeof(struct nilfs_finfo
));
499 if (NILFS_I(inode
)->i_root
&&
500 !test_bit(NILFS_SC_HAVE_DELTA
, &sci
->sc_flags
))
501 set_bit(NILFS_SC_HAVE_DELTA
, &sci
->sc_flags
);
505 static void nilfs_segctor_end_finfo(struct nilfs_sc_info
*sci
,
508 struct nilfs_finfo
*finfo
;
509 struct nilfs_inode_info
*ii
;
510 struct nilfs_segment_buffer
*segbuf
;
513 if (sci
->sc_blk_cnt
== 0)
518 if (test_bit(NILFS_I_GCINODE
, &ii
->i_state
))
520 else if (NILFS_ROOT_METADATA_FILE(inode
->i_ino
))
525 finfo
= nilfs_segctor_map_segsum_entry(sci
, &sci
->sc_finfo_ptr
,
527 finfo
->fi_ino
= cpu_to_le64(inode
->i_ino
);
528 finfo
->fi_nblocks
= cpu_to_le32(sci
->sc_blk_cnt
);
529 finfo
->fi_ndatablk
= cpu_to_le32(sci
->sc_datablk_cnt
);
530 finfo
->fi_cno
= cpu_to_le64(cno
);
532 segbuf
= sci
->sc_curseg
;
533 segbuf
->sb_sum
.sumbytes
= sci
->sc_binfo_ptr
.offset
+
534 sci
->sc_super
->s_blocksize
* (segbuf
->sb_sum
.nsumblk
- 1);
535 sci
->sc_finfo_ptr
= sci
->sc_binfo_ptr
;
536 sci
->sc_blk_cnt
= sci
->sc_datablk_cnt
= 0;
539 static int nilfs_segctor_add_file_block(struct nilfs_sc_info
*sci
,
540 struct buffer_head
*bh
,
542 unsigned int binfo_size
)
544 struct nilfs_segment_buffer
*segbuf
;
545 int required
, err
= 0;
548 segbuf
= sci
->sc_curseg
;
549 required
= nilfs_segctor_segsum_block_required(
550 sci
, &sci
->sc_binfo_ptr
, binfo_size
);
551 if (segbuf
->sb_sum
.nblocks
+ required
+ 1 > segbuf
->sb_rest_blocks
) {
552 nilfs_segctor_end_finfo(sci
, inode
);
553 err
= nilfs_segctor_feed_segment(sci
);
558 if (unlikely(required
)) {
559 err
= nilfs_segbuf_extend_segsum(segbuf
);
563 if (sci
->sc_blk_cnt
== 0)
564 nilfs_segctor_begin_finfo(sci
, inode
);
566 nilfs_segctor_map_segsum_entry(sci
, &sci
->sc_binfo_ptr
, binfo_size
);
567 /* Substitution to vblocknr is delayed until update_blocknr() */
568 nilfs_segbuf_add_file_buffer(segbuf
, bh
);
575 * Callback functions that enumerate, mark, and collect dirty blocks
577 static int nilfs_collect_file_data(struct nilfs_sc_info
*sci
,
578 struct buffer_head
*bh
, struct inode
*inode
)
582 err
= nilfs_bmap_propagate(NILFS_I(inode
)->i_bmap
, bh
);
586 err
= nilfs_segctor_add_file_block(sci
, bh
, inode
,
587 sizeof(struct nilfs_binfo_v
));
589 sci
->sc_datablk_cnt
++;
593 static int nilfs_collect_file_node(struct nilfs_sc_info
*sci
,
594 struct buffer_head
*bh
,
597 return nilfs_bmap_propagate(NILFS_I(inode
)->i_bmap
, bh
);
600 static int nilfs_collect_file_bmap(struct nilfs_sc_info
*sci
,
601 struct buffer_head
*bh
,
604 WARN_ON(!buffer_dirty(bh
));
605 return nilfs_segctor_add_file_block(sci
, bh
, inode
, sizeof(__le64
));
608 static void nilfs_write_file_data_binfo(struct nilfs_sc_info
*sci
,
609 struct nilfs_segsum_pointer
*ssp
,
610 union nilfs_binfo
*binfo
)
612 struct nilfs_binfo_v
*binfo_v
= nilfs_segctor_map_segsum_entry(
613 sci
, ssp
, sizeof(*binfo_v
));
614 *binfo_v
= binfo
->bi_v
;
617 static void nilfs_write_file_node_binfo(struct nilfs_sc_info
*sci
,
618 struct nilfs_segsum_pointer
*ssp
,
619 union nilfs_binfo
*binfo
)
621 __le64
*vblocknr
= nilfs_segctor_map_segsum_entry(
622 sci
, ssp
, sizeof(*vblocknr
));
623 *vblocknr
= binfo
->bi_v
.bi_vblocknr
;
626 static const struct nilfs_sc_operations nilfs_sc_file_ops
= {
627 .collect_data
= nilfs_collect_file_data
,
628 .collect_node
= nilfs_collect_file_node
,
629 .collect_bmap
= nilfs_collect_file_bmap
,
630 .write_data_binfo
= nilfs_write_file_data_binfo
,
631 .write_node_binfo
= nilfs_write_file_node_binfo
,
634 static int nilfs_collect_dat_data(struct nilfs_sc_info
*sci
,
635 struct buffer_head
*bh
, struct inode
*inode
)
639 err
= nilfs_bmap_propagate(NILFS_I(inode
)->i_bmap
, bh
);
643 err
= nilfs_segctor_add_file_block(sci
, bh
, inode
, sizeof(__le64
));
645 sci
->sc_datablk_cnt
++;
649 static int nilfs_collect_dat_bmap(struct nilfs_sc_info
*sci
,
650 struct buffer_head
*bh
, struct inode
*inode
)
652 WARN_ON(!buffer_dirty(bh
));
653 return nilfs_segctor_add_file_block(sci
, bh
, inode
,
654 sizeof(struct nilfs_binfo_dat
));
657 static void nilfs_write_dat_data_binfo(struct nilfs_sc_info
*sci
,
658 struct nilfs_segsum_pointer
*ssp
,
659 union nilfs_binfo
*binfo
)
661 __le64
*blkoff
= nilfs_segctor_map_segsum_entry(sci
, ssp
,
663 *blkoff
= binfo
->bi_dat
.bi_blkoff
;
666 static void nilfs_write_dat_node_binfo(struct nilfs_sc_info
*sci
,
667 struct nilfs_segsum_pointer
*ssp
,
668 union nilfs_binfo
*binfo
)
670 struct nilfs_binfo_dat
*binfo_dat
=
671 nilfs_segctor_map_segsum_entry(sci
, ssp
, sizeof(*binfo_dat
));
672 *binfo_dat
= binfo
->bi_dat
;
675 static const struct nilfs_sc_operations nilfs_sc_dat_ops
= {
676 .collect_data
= nilfs_collect_dat_data
,
677 .collect_node
= nilfs_collect_file_node
,
678 .collect_bmap
= nilfs_collect_dat_bmap
,
679 .write_data_binfo
= nilfs_write_dat_data_binfo
,
680 .write_node_binfo
= nilfs_write_dat_node_binfo
,
683 static const struct nilfs_sc_operations nilfs_sc_dsync_ops
= {
684 .collect_data
= nilfs_collect_file_data
,
685 .collect_node
= NULL
,
686 .collect_bmap
= NULL
,
687 .write_data_binfo
= nilfs_write_file_data_binfo
,
688 .write_node_binfo
= NULL
,
691 static size_t nilfs_lookup_dirty_data_buffers(struct inode
*inode
,
692 struct list_head
*listp
,
694 loff_t start
, loff_t end
)
696 struct address_space
*mapping
= inode
->i_mapping
;
698 pgoff_t index
= 0, last
= ULONG_MAX
;
702 if (unlikely(start
!= 0 || end
!= LLONG_MAX
)) {
704 * A valid range is given for sync-ing data pages. The
705 * range is rounded to per-page; extra dirty buffers
706 * may be included if blocksize < pagesize.
708 index
= start
>> PAGE_SHIFT
;
709 last
= end
>> PAGE_SHIFT
;
711 pagevec_init(&pvec
, 0);
713 if (unlikely(index
> last
) ||
714 !pagevec_lookup_tag(&pvec
, mapping
, &index
, PAGECACHE_TAG_DIRTY
,
715 min_t(pgoff_t
, last
- index
,
716 PAGEVEC_SIZE
- 1) + 1))
719 for (i
= 0; i
< pagevec_count(&pvec
); i
++) {
720 struct buffer_head
*bh
, *head
;
721 struct page
*page
= pvec
.pages
[i
];
723 if (unlikely(page
->index
> last
))
727 if (!page_has_buffers(page
))
728 create_empty_buffers(page
, i_blocksize(inode
), 0);
731 bh
= head
= page_buffers(page
);
733 if (!buffer_dirty(bh
) || buffer_async_write(bh
))
736 list_add_tail(&bh
->b_assoc_buffers
, listp
);
738 if (unlikely(ndirties
>= nlimit
)) {
739 pagevec_release(&pvec
);
743 } while (bh
= bh
->b_this_page
, bh
!= head
);
745 pagevec_release(&pvec
);
750 static void nilfs_lookup_dirty_node_buffers(struct inode
*inode
,
751 struct list_head
*listp
)
753 struct nilfs_inode_info
*ii
= NILFS_I(inode
);
754 struct address_space
*mapping
= &ii
->i_btnode_cache
;
756 struct buffer_head
*bh
, *head
;
760 pagevec_init(&pvec
, 0);
762 while (pagevec_lookup_tag(&pvec
, mapping
, &index
, PAGECACHE_TAG_DIRTY
,
764 for (i
= 0; i
< pagevec_count(&pvec
); i
++) {
765 bh
= head
= page_buffers(pvec
.pages
[i
]);
767 if (buffer_dirty(bh
) &&
768 !buffer_async_write(bh
)) {
770 list_add_tail(&bh
->b_assoc_buffers
,
773 bh
= bh
->b_this_page
;
774 } while (bh
!= head
);
776 pagevec_release(&pvec
);
781 static void nilfs_dispose_list(struct the_nilfs
*nilfs
,
782 struct list_head
*head
, int force
)
784 struct nilfs_inode_info
*ii
, *n
;
785 struct nilfs_inode_info
*ivec
[SC_N_INODEVEC
], **pii
;
788 while (!list_empty(head
)) {
789 spin_lock(&nilfs
->ns_inode_lock
);
790 list_for_each_entry_safe(ii
, n
, head
, i_dirty
) {
791 list_del_init(&ii
->i_dirty
);
793 if (unlikely(ii
->i_bh
)) {
797 } else if (test_bit(NILFS_I_DIRTY
, &ii
->i_state
)) {
798 set_bit(NILFS_I_QUEUED
, &ii
->i_state
);
799 list_add_tail(&ii
->i_dirty
,
800 &nilfs
->ns_dirty_files
);
804 if (nv
== SC_N_INODEVEC
)
807 spin_unlock(&nilfs
->ns_inode_lock
);
809 for (pii
= ivec
; nv
> 0; pii
++, nv
--)
810 iput(&(*pii
)->vfs_inode
);
814 static void nilfs_iput_work_func(struct work_struct
*work
)
816 struct nilfs_sc_info
*sci
= container_of(work
, struct nilfs_sc_info
,
818 struct the_nilfs
*nilfs
= sci
->sc_super
->s_fs_info
;
820 nilfs_dispose_list(nilfs
, &sci
->sc_iput_queue
, 0);
823 static int nilfs_test_metadata_dirty(struct the_nilfs
*nilfs
,
824 struct nilfs_root
*root
)
828 if (nilfs_mdt_fetch_dirty(root
->ifile
))
830 if (nilfs_mdt_fetch_dirty(nilfs
->ns_cpfile
))
832 if (nilfs_mdt_fetch_dirty(nilfs
->ns_sufile
))
834 if ((ret
|| nilfs_doing_gc()) && nilfs_mdt_fetch_dirty(nilfs
->ns_dat
))
839 static int nilfs_segctor_clean(struct nilfs_sc_info
*sci
)
841 return list_empty(&sci
->sc_dirty_files
) &&
842 !test_bit(NILFS_SC_DIRTY
, &sci
->sc_flags
) &&
843 sci
->sc_nfreesegs
== 0 &&
844 (!nilfs_doing_gc() || list_empty(&sci
->sc_gc_inodes
));
847 static int nilfs_segctor_confirm(struct nilfs_sc_info
*sci
)
849 struct the_nilfs
*nilfs
= sci
->sc_super
->s_fs_info
;
852 if (nilfs_test_metadata_dirty(nilfs
, sci
->sc_root
))
853 set_bit(NILFS_SC_DIRTY
, &sci
->sc_flags
);
855 spin_lock(&nilfs
->ns_inode_lock
);
856 if (list_empty(&nilfs
->ns_dirty_files
) && nilfs_segctor_clean(sci
))
859 spin_unlock(&nilfs
->ns_inode_lock
);
863 static void nilfs_segctor_clear_metadata_dirty(struct nilfs_sc_info
*sci
)
865 struct the_nilfs
*nilfs
= sci
->sc_super
->s_fs_info
;
867 nilfs_mdt_clear_dirty(sci
->sc_root
->ifile
);
868 nilfs_mdt_clear_dirty(nilfs
->ns_cpfile
);
869 nilfs_mdt_clear_dirty(nilfs
->ns_sufile
);
870 nilfs_mdt_clear_dirty(nilfs
->ns_dat
);
873 static int nilfs_segctor_create_checkpoint(struct nilfs_sc_info
*sci
)
875 struct the_nilfs
*nilfs
= sci
->sc_super
->s_fs_info
;
876 struct buffer_head
*bh_cp
;
877 struct nilfs_checkpoint
*raw_cp
;
880 /* XXX: this interface will be changed */
881 err
= nilfs_cpfile_get_checkpoint(nilfs
->ns_cpfile
, nilfs
->ns_cno
, 1,
885 * The following code is duplicated with cpfile. But, it is
886 * needed to collect the checkpoint even if it was not newly
889 mark_buffer_dirty(bh_cp
);
890 nilfs_mdt_mark_dirty(nilfs
->ns_cpfile
);
891 nilfs_cpfile_put_checkpoint(
892 nilfs
->ns_cpfile
, nilfs
->ns_cno
, bh_cp
);
894 WARN_ON(err
== -EINVAL
|| err
== -ENOENT
);
899 static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info
*sci
)
901 struct the_nilfs
*nilfs
= sci
->sc_super
->s_fs_info
;
902 struct buffer_head
*bh_cp
;
903 struct nilfs_checkpoint
*raw_cp
;
906 err
= nilfs_cpfile_get_checkpoint(nilfs
->ns_cpfile
, nilfs
->ns_cno
, 0,
909 WARN_ON(err
== -EINVAL
|| err
== -ENOENT
);
912 raw_cp
->cp_snapshot_list
.ssl_next
= 0;
913 raw_cp
->cp_snapshot_list
.ssl_prev
= 0;
914 raw_cp
->cp_inodes_count
=
915 cpu_to_le64(atomic64_read(&sci
->sc_root
->inodes_count
));
916 raw_cp
->cp_blocks_count
=
917 cpu_to_le64(atomic64_read(&sci
->sc_root
->blocks_count
));
918 raw_cp
->cp_nblk_inc
=
919 cpu_to_le64(sci
->sc_nblk_inc
+ sci
->sc_nblk_this_inc
);
920 raw_cp
->cp_create
= cpu_to_le64(sci
->sc_seg_ctime
);
921 raw_cp
->cp_cno
= cpu_to_le64(nilfs
->ns_cno
);
923 if (test_bit(NILFS_SC_HAVE_DELTA
, &sci
->sc_flags
))
924 nilfs_checkpoint_clear_minor(raw_cp
);
926 nilfs_checkpoint_set_minor(raw_cp
);
928 nilfs_write_inode_common(sci
->sc_root
->ifile
,
929 &raw_cp
->cp_ifile_inode
, 1);
930 nilfs_cpfile_put_checkpoint(nilfs
->ns_cpfile
, nilfs
->ns_cno
, bh_cp
);
937 static void nilfs_fill_in_file_bmap(struct inode
*ifile
,
938 struct nilfs_inode_info
*ii
)
941 struct buffer_head
*ibh
;
942 struct nilfs_inode
*raw_inode
;
944 if (test_bit(NILFS_I_BMAP
, &ii
->i_state
)) {
947 raw_inode
= nilfs_ifile_map_inode(ifile
, ii
->vfs_inode
.i_ino
,
949 nilfs_bmap_write(ii
->i_bmap
, raw_inode
);
950 nilfs_ifile_unmap_inode(ifile
, ii
->vfs_inode
.i_ino
, ibh
);
954 static void nilfs_segctor_fill_in_file_bmap(struct nilfs_sc_info
*sci
)
956 struct nilfs_inode_info
*ii
;
958 list_for_each_entry(ii
, &sci
->sc_dirty_files
, i_dirty
) {
959 nilfs_fill_in_file_bmap(sci
->sc_root
->ifile
, ii
);
960 set_bit(NILFS_I_COLLECTED
, &ii
->i_state
);
964 static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info
*sci
,
965 struct the_nilfs
*nilfs
)
967 struct buffer_head
*bh_sr
;
968 struct nilfs_super_root
*raw_sr
;
969 unsigned int isz
, srsz
;
971 bh_sr
= NILFS_LAST_SEGBUF(&sci
->sc_segbufs
)->sb_super_root
;
972 raw_sr
= (struct nilfs_super_root
*)bh_sr
->b_data
;
973 isz
= nilfs
->ns_inode_size
;
974 srsz
= NILFS_SR_BYTES(isz
);
976 raw_sr
->sr_bytes
= cpu_to_le16(srsz
);
977 raw_sr
->sr_nongc_ctime
978 = cpu_to_le64(nilfs_doing_gc() ?
979 nilfs
->ns_nongc_ctime
: sci
->sc_seg_ctime
);
980 raw_sr
->sr_flags
= 0;
982 nilfs_write_inode_common(nilfs
->ns_dat
, (void *)raw_sr
+
983 NILFS_SR_DAT_OFFSET(isz
), 1);
984 nilfs_write_inode_common(nilfs
->ns_cpfile
, (void *)raw_sr
+
985 NILFS_SR_CPFILE_OFFSET(isz
), 1);
986 nilfs_write_inode_common(nilfs
->ns_sufile
, (void *)raw_sr
+
987 NILFS_SR_SUFILE_OFFSET(isz
), 1);
988 memset((void *)raw_sr
+ srsz
, 0, nilfs
->ns_blocksize
- srsz
);
991 static void nilfs_redirty_inodes(struct list_head
*head
)
993 struct nilfs_inode_info
*ii
;
995 list_for_each_entry(ii
, head
, i_dirty
) {
996 if (test_bit(NILFS_I_COLLECTED
, &ii
->i_state
))
997 clear_bit(NILFS_I_COLLECTED
, &ii
->i_state
);
1001 static void nilfs_drop_collected_inodes(struct list_head
*head
)
1003 struct nilfs_inode_info
*ii
;
1005 list_for_each_entry(ii
, head
, i_dirty
) {
1006 if (!test_and_clear_bit(NILFS_I_COLLECTED
, &ii
->i_state
))
1009 clear_bit(NILFS_I_INODE_SYNC
, &ii
->i_state
);
1010 set_bit(NILFS_I_UPDATED
, &ii
->i_state
);
1014 static int nilfs_segctor_apply_buffers(struct nilfs_sc_info
*sci
,
1015 struct inode
*inode
,
1016 struct list_head
*listp
,
1017 int (*collect
)(struct nilfs_sc_info
*,
1018 struct buffer_head
*,
1021 struct buffer_head
*bh
, *n
;
1025 list_for_each_entry_safe(bh
, n
, listp
, b_assoc_buffers
) {
1026 list_del_init(&bh
->b_assoc_buffers
);
1027 err
= collect(sci
, bh
, inode
);
1030 goto dispose_buffers
;
1036 while (!list_empty(listp
)) {
1037 bh
= list_first_entry(listp
, struct buffer_head
,
1039 list_del_init(&bh
->b_assoc_buffers
);
1045 static size_t nilfs_segctor_buffer_rest(struct nilfs_sc_info
*sci
)
1047 /* Remaining number of blocks within segment buffer */
1048 return sci
->sc_segbuf_nblocks
-
1049 (sci
->sc_nblk_this_inc
+ sci
->sc_curseg
->sb_sum
.nblocks
);
1052 static int nilfs_segctor_scan_file(struct nilfs_sc_info
*sci
,
1053 struct inode
*inode
,
1054 const struct nilfs_sc_operations
*sc_ops
)
1056 LIST_HEAD(data_buffers
);
1057 LIST_HEAD(node_buffers
);
1060 if (!(sci
->sc_stage
.flags
& NILFS_CF_NODE
)) {
1061 size_t n
, rest
= nilfs_segctor_buffer_rest(sci
);
1063 n
= nilfs_lookup_dirty_data_buffers(
1064 inode
, &data_buffers
, rest
+ 1, 0, LLONG_MAX
);
1066 err
= nilfs_segctor_apply_buffers(
1067 sci
, inode
, &data_buffers
,
1068 sc_ops
->collect_data
);
1069 BUG_ON(!err
); /* always receive -E2BIG or true error */
1073 nilfs_lookup_dirty_node_buffers(inode
, &node_buffers
);
1075 if (!(sci
->sc_stage
.flags
& NILFS_CF_NODE
)) {
1076 err
= nilfs_segctor_apply_buffers(
1077 sci
, inode
, &data_buffers
, sc_ops
->collect_data
);
1078 if (unlikely(err
)) {
1079 /* dispose node list */
1080 nilfs_segctor_apply_buffers(
1081 sci
, inode
, &node_buffers
, NULL
);
1084 sci
->sc_stage
.flags
|= NILFS_CF_NODE
;
1087 err
= nilfs_segctor_apply_buffers(
1088 sci
, inode
, &node_buffers
, sc_ops
->collect_node
);
1092 nilfs_bmap_lookup_dirty_buffers(NILFS_I(inode
)->i_bmap
, &node_buffers
);
1093 err
= nilfs_segctor_apply_buffers(
1094 sci
, inode
, &node_buffers
, sc_ops
->collect_bmap
);
1098 nilfs_segctor_end_finfo(sci
, inode
);
1099 sci
->sc_stage
.flags
&= ~NILFS_CF_NODE
;
1105 static int nilfs_segctor_scan_file_dsync(struct nilfs_sc_info
*sci
,
1106 struct inode
*inode
)
1108 LIST_HEAD(data_buffers
);
1109 size_t n
, rest
= nilfs_segctor_buffer_rest(sci
);
1112 n
= nilfs_lookup_dirty_data_buffers(inode
, &data_buffers
, rest
+ 1,
1113 sci
->sc_dsync_start
,
1116 err
= nilfs_segctor_apply_buffers(sci
, inode
, &data_buffers
,
1117 nilfs_collect_file_data
);
1119 nilfs_segctor_end_finfo(sci
, inode
);
1121 /* always receive -E2BIG or true error if n > rest */
1126 static int nilfs_segctor_collect_blocks(struct nilfs_sc_info
*sci
, int mode
)
1128 struct the_nilfs
*nilfs
= sci
->sc_super
->s_fs_info
;
1129 struct list_head
*head
;
1130 struct nilfs_inode_info
*ii
;
1134 switch (nilfs_sc_cstage_get(sci
)) {
1137 sci
->sc_stage
.flags
= 0;
1139 if (!test_bit(NILFS_SC_UNCLOSED
, &sci
->sc_flags
)) {
1140 sci
->sc_nblk_inc
= 0;
1141 sci
->sc_curseg
->sb_sum
.flags
= NILFS_SS_LOGBGN
;
1142 if (mode
== SC_LSEG_DSYNC
) {
1143 nilfs_sc_cstage_set(sci
, NILFS_ST_DSYNC
);
1148 sci
->sc_stage
.dirty_file_ptr
= NULL
;
1149 sci
->sc_stage
.gc_inode_ptr
= NULL
;
1150 if (mode
== SC_FLUSH_DAT
) {
1151 nilfs_sc_cstage_set(sci
, NILFS_ST_DAT
);
1154 nilfs_sc_cstage_inc(sci
); /* Fall through */
1156 if (nilfs_doing_gc()) {
1157 head
= &sci
->sc_gc_inodes
;
1158 ii
= list_prepare_entry(sci
->sc_stage
.gc_inode_ptr
,
1160 list_for_each_entry_continue(ii
, head
, i_dirty
) {
1161 err
= nilfs_segctor_scan_file(
1162 sci
, &ii
->vfs_inode
,
1163 &nilfs_sc_file_ops
);
1164 if (unlikely(err
)) {
1165 sci
->sc_stage
.gc_inode_ptr
= list_entry(
1167 struct nilfs_inode_info
,
1171 set_bit(NILFS_I_COLLECTED
, &ii
->i_state
);
1173 sci
->sc_stage
.gc_inode_ptr
= NULL
;
1175 nilfs_sc_cstage_inc(sci
); /* Fall through */
1177 head
= &sci
->sc_dirty_files
;
1178 ii
= list_prepare_entry(sci
->sc_stage
.dirty_file_ptr
, head
,
1180 list_for_each_entry_continue(ii
, head
, i_dirty
) {
1181 clear_bit(NILFS_I_DIRTY
, &ii
->i_state
);
1183 err
= nilfs_segctor_scan_file(sci
, &ii
->vfs_inode
,
1184 &nilfs_sc_file_ops
);
1185 if (unlikely(err
)) {
1186 sci
->sc_stage
.dirty_file_ptr
=
1187 list_entry(ii
->i_dirty
.prev
,
1188 struct nilfs_inode_info
,
1192 /* sci->sc_stage.dirty_file_ptr = NILFS_I(inode); */
1193 /* XXX: required ? */
1195 sci
->sc_stage
.dirty_file_ptr
= NULL
;
1196 if (mode
== SC_FLUSH_FILE
) {
1197 nilfs_sc_cstage_set(sci
, NILFS_ST_DONE
);
1200 nilfs_sc_cstage_inc(sci
);
1201 sci
->sc_stage
.flags
|= NILFS_CF_IFILE_STARTED
;
1203 case NILFS_ST_IFILE
:
1204 err
= nilfs_segctor_scan_file(sci
, sci
->sc_root
->ifile
,
1205 &nilfs_sc_file_ops
);
1208 nilfs_sc_cstage_inc(sci
);
1209 /* Creating a checkpoint */
1210 err
= nilfs_segctor_create_checkpoint(sci
);
1214 case NILFS_ST_CPFILE
:
1215 err
= nilfs_segctor_scan_file(sci
, nilfs
->ns_cpfile
,
1216 &nilfs_sc_file_ops
);
1219 nilfs_sc_cstage_inc(sci
); /* Fall through */
1220 case NILFS_ST_SUFILE
:
1221 err
= nilfs_sufile_freev(nilfs
->ns_sufile
, sci
->sc_freesegs
,
1222 sci
->sc_nfreesegs
, &ndone
);
1223 if (unlikely(err
)) {
1224 nilfs_sufile_cancel_freev(nilfs
->ns_sufile
,
1225 sci
->sc_freesegs
, ndone
,
1229 sci
->sc_stage
.flags
|= NILFS_CF_SUFREED
;
1231 err
= nilfs_segctor_scan_file(sci
, nilfs
->ns_sufile
,
1232 &nilfs_sc_file_ops
);
1235 nilfs_sc_cstage_inc(sci
); /* Fall through */
1238 err
= nilfs_segctor_scan_file(sci
, nilfs
->ns_dat
,
1242 if (mode
== SC_FLUSH_DAT
) {
1243 nilfs_sc_cstage_set(sci
, NILFS_ST_DONE
);
1246 nilfs_sc_cstage_inc(sci
); /* Fall through */
1248 if (mode
== SC_LSEG_SR
) {
1249 /* Appending a super root */
1250 err
= nilfs_segctor_add_super_root(sci
);
1254 /* End of a logical segment */
1255 sci
->sc_curseg
->sb_sum
.flags
|= NILFS_SS_LOGEND
;
1256 nilfs_sc_cstage_set(sci
, NILFS_ST_DONE
);
1258 case NILFS_ST_DSYNC
:
1260 sci
->sc_curseg
->sb_sum
.flags
|= NILFS_SS_SYNDT
;
1261 ii
= sci
->sc_dsync_inode
;
1262 if (!test_bit(NILFS_I_BUSY
, &ii
->i_state
))
1265 err
= nilfs_segctor_scan_file_dsync(sci
, &ii
->vfs_inode
);
1268 sci
->sc_curseg
->sb_sum
.flags
|= NILFS_SS_LOGEND
;
1269 nilfs_sc_cstage_set(sci
, NILFS_ST_DONE
);
1282 * nilfs_segctor_begin_construction - setup segment buffer to make a new log
1283 * @sci: nilfs_sc_info
1284 * @nilfs: nilfs object
1286 static int nilfs_segctor_begin_construction(struct nilfs_sc_info
*sci
,
1287 struct the_nilfs
*nilfs
)
1289 struct nilfs_segment_buffer
*segbuf
, *prev
;
1293 segbuf
= nilfs_segbuf_new(sci
->sc_super
);
1294 if (unlikely(!segbuf
))
1297 if (list_empty(&sci
->sc_write_logs
)) {
1298 nilfs_segbuf_map(segbuf
, nilfs
->ns_segnum
,
1299 nilfs
->ns_pseg_offset
, nilfs
);
1300 if (segbuf
->sb_rest_blocks
< NILFS_PSEG_MIN_BLOCKS
) {
1301 nilfs_shift_to_next_segment(nilfs
);
1302 nilfs_segbuf_map(segbuf
, nilfs
->ns_segnum
, 0, nilfs
);
1305 segbuf
->sb_sum
.seg_seq
= nilfs
->ns_seg_seq
;
1306 nextnum
= nilfs
->ns_nextnum
;
1308 if (nilfs
->ns_segnum
== nilfs
->ns_nextnum
)
1309 /* Start from the head of a new full segment */
1313 prev
= NILFS_LAST_SEGBUF(&sci
->sc_write_logs
);
1314 nilfs_segbuf_map_cont(segbuf
, prev
);
1315 segbuf
->sb_sum
.seg_seq
= prev
->sb_sum
.seg_seq
;
1316 nextnum
= prev
->sb_nextnum
;
1318 if (segbuf
->sb_rest_blocks
< NILFS_PSEG_MIN_BLOCKS
) {
1319 nilfs_segbuf_map(segbuf
, prev
->sb_nextnum
, 0, nilfs
);
1320 segbuf
->sb_sum
.seg_seq
++;
1325 err
= nilfs_sufile_mark_dirty(nilfs
->ns_sufile
, segbuf
->sb_segnum
);
1330 err
= nilfs_sufile_alloc(nilfs
->ns_sufile
, &nextnum
);
1334 nilfs_segbuf_set_next_segnum(segbuf
, nextnum
, nilfs
);
1336 BUG_ON(!list_empty(&sci
->sc_segbufs
));
1337 list_add_tail(&segbuf
->sb_list
, &sci
->sc_segbufs
);
1338 sci
->sc_segbuf_nblocks
= segbuf
->sb_rest_blocks
;
1342 nilfs_segbuf_free(segbuf
);
1346 static int nilfs_segctor_extend_segments(struct nilfs_sc_info
*sci
,
1347 struct the_nilfs
*nilfs
, int nadd
)
1349 struct nilfs_segment_buffer
*segbuf
, *prev
;
1350 struct inode
*sufile
= nilfs
->ns_sufile
;
1355 prev
= NILFS_LAST_SEGBUF(&sci
->sc_segbufs
);
1357 * Since the segment specified with nextnum might be allocated during
1358 * the previous construction, the buffer including its segusage may
1359 * not be dirty. The following call ensures that the buffer is dirty
1360 * and will pin the buffer on memory until the sufile is written.
1362 err
= nilfs_sufile_mark_dirty(sufile
, prev
->sb_nextnum
);
1366 for (i
= 0; i
< nadd
; i
++) {
1367 /* extend segment info */
1369 segbuf
= nilfs_segbuf_new(sci
->sc_super
);
1370 if (unlikely(!segbuf
))
1373 /* map this buffer to region of segment on-disk */
1374 nilfs_segbuf_map(segbuf
, prev
->sb_nextnum
, 0, nilfs
);
1375 sci
->sc_segbuf_nblocks
+= segbuf
->sb_rest_blocks
;
1377 /* allocate the next next full segment */
1378 err
= nilfs_sufile_alloc(sufile
, &nextnextnum
);
1382 segbuf
->sb_sum
.seg_seq
= prev
->sb_sum
.seg_seq
+ 1;
1383 nilfs_segbuf_set_next_segnum(segbuf
, nextnextnum
, nilfs
);
1385 list_add_tail(&segbuf
->sb_list
, &list
);
1388 list_splice_tail(&list
, &sci
->sc_segbufs
);
1392 nilfs_segbuf_free(segbuf
);
1394 list_for_each_entry(segbuf
, &list
, sb_list
) {
1395 ret
= nilfs_sufile_free(sufile
, segbuf
->sb_nextnum
);
1396 WARN_ON(ret
); /* never fails */
1398 nilfs_destroy_logs(&list
);
1402 static void nilfs_free_incomplete_logs(struct list_head
*logs
,
1403 struct the_nilfs
*nilfs
)
1405 struct nilfs_segment_buffer
*segbuf
, *prev
;
1406 struct inode
*sufile
= nilfs
->ns_sufile
;
1409 segbuf
= NILFS_FIRST_SEGBUF(logs
);
1410 if (nilfs
->ns_nextnum
!= segbuf
->sb_nextnum
) {
1411 ret
= nilfs_sufile_free(sufile
, segbuf
->sb_nextnum
);
1412 WARN_ON(ret
); /* never fails */
1414 if (atomic_read(&segbuf
->sb_err
)) {
1415 /* Case 1: The first segment failed */
1416 if (segbuf
->sb_pseg_start
!= segbuf
->sb_fseg_start
)
1418 * Case 1a: Partial segment appended into an existing
1421 nilfs_terminate_segment(nilfs
, segbuf
->sb_fseg_start
,
1422 segbuf
->sb_fseg_end
);
1423 else /* Case 1b: New full segment */
1424 set_nilfs_discontinued(nilfs
);
1428 list_for_each_entry_continue(segbuf
, logs
, sb_list
) {
1429 if (prev
->sb_nextnum
!= segbuf
->sb_nextnum
) {
1430 ret
= nilfs_sufile_free(sufile
, segbuf
->sb_nextnum
);
1431 WARN_ON(ret
); /* never fails */
1433 if (atomic_read(&segbuf
->sb_err
) &&
1434 segbuf
->sb_segnum
!= nilfs
->ns_nextnum
)
1435 /* Case 2: extended segment (!= next) failed */
1436 nilfs_sufile_set_error(sufile
, segbuf
->sb_segnum
);
1441 static void nilfs_segctor_update_segusage(struct nilfs_sc_info
*sci
,
1442 struct inode
*sufile
)
1444 struct nilfs_segment_buffer
*segbuf
;
1445 unsigned long live_blocks
;
1448 list_for_each_entry(segbuf
, &sci
->sc_segbufs
, sb_list
) {
1449 live_blocks
= segbuf
->sb_sum
.nblocks
+
1450 (segbuf
->sb_pseg_start
- segbuf
->sb_fseg_start
);
1451 ret
= nilfs_sufile_set_segment_usage(sufile
, segbuf
->sb_segnum
,
1454 WARN_ON(ret
); /* always succeed because the segusage is dirty */
1458 static void nilfs_cancel_segusage(struct list_head
*logs
, struct inode
*sufile
)
1460 struct nilfs_segment_buffer
*segbuf
;
1463 segbuf
= NILFS_FIRST_SEGBUF(logs
);
1464 ret
= nilfs_sufile_set_segment_usage(sufile
, segbuf
->sb_segnum
,
1465 segbuf
->sb_pseg_start
-
1466 segbuf
->sb_fseg_start
, 0);
1467 WARN_ON(ret
); /* always succeed because the segusage is dirty */
1469 list_for_each_entry_continue(segbuf
, logs
, sb_list
) {
1470 ret
= nilfs_sufile_set_segment_usage(sufile
, segbuf
->sb_segnum
,
1472 WARN_ON(ret
); /* always succeed */
1476 static void nilfs_segctor_truncate_segments(struct nilfs_sc_info
*sci
,
1477 struct nilfs_segment_buffer
*last
,
1478 struct inode
*sufile
)
1480 struct nilfs_segment_buffer
*segbuf
= last
;
1483 list_for_each_entry_continue(segbuf
, &sci
->sc_segbufs
, sb_list
) {
1484 sci
->sc_segbuf_nblocks
-= segbuf
->sb_rest_blocks
;
1485 ret
= nilfs_sufile_free(sufile
, segbuf
->sb_nextnum
);
1488 nilfs_truncate_logs(&sci
->sc_segbufs
, last
);
1492 static int nilfs_segctor_collect(struct nilfs_sc_info
*sci
,
1493 struct the_nilfs
*nilfs
, int mode
)
1495 struct nilfs_cstage prev_stage
= sci
->sc_stage
;
1498 /* Collection retry loop */
1500 sci
->sc_nblk_this_inc
= 0;
1501 sci
->sc_curseg
= NILFS_FIRST_SEGBUF(&sci
->sc_segbufs
);
1503 err
= nilfs_segctor_reset_segment_buffer(sci
);
1507 err
= nilfs_segctor_collect_blocks(sci
, mode
);
1508 sci
->sc_nblk_this_inc
+= sci
->sc_curseg
->sb_sum
.nblocks
;
1512 if (unlikely(err
!= -E2BIG
))
1515 /* The current segment is filled up */
1516 if (mode
!= SC_LSEG_SR
||
1517 nilfs_sc_cstage_get(sci
) < NILFS_ST_CPFILE
)
1520 nilfs_clear_logs(&sci
->sc_segbufs
);
1522 if (sci
->sc_stage
.flags
& NILFS_CF_SUFREED
) {
1523 err
= nilfs_sufile_cancel_freev(nilfs
->ns_sufile
,
1527 WARN_ON(err
); /* do not happen */
1528 sci
->sc_stage
.flags
&= ~NILFS_CF_SUFREED
;
1531 err
= nilfs_segctor_extend_segments(sci
, nilfs
, nadd
);
1535 nadd
= min_t(int, nadd
<< 1, SC_MAX_SEGDELTA
);
1536 sci
->sc_stage
= prev_stage
;
1538 nilfs_segctor_truncate_segments(sci
, sci
->sc_curseg
, nilfs
->ns_sufile
);
1545 static void nilfs_list_replace_buffer(struct buffer_head
*old_bh
,
1546 struct buffer_head
*new_bh
)
1548 BUG_ON(!list_empty(&new_bh
->b_assoc_buffers
));
1550 list_replace_init(&old_bh
->b_assoc_buffers
, &new_bh
->b_assoc_buffers
);
1551 /* The caller must release old_bh */
1555 nilfs_segctor_update_payload_blocknr(struct nilfs_sc_info
*sci
,
1556 struct nilfs_segment_buffer
*segbuf
,
1559 struct inode
*inode
= NULL
;
1561 unsigned long nfinfo
= segbuf
->sb_sum
.nfinfo
;
1562 unsigned long nblocks
= 0, ndatablk
= 0;
1563 const struct nilfs_sc_operations
*sc_op
= NULL
;
1564 struct nilfs_segsum_pointer ssp
;
1565 struct nilfs_finfo
*finfo
= NULL
;
1566 union nilfs_binfo binfo
;
1567 struct buffer_head
*bh
, *bh_org
;
1574 blocknr
= segbuf
->sb_pseg_start
+ segbuf
->sb_sum
.nsumblk
;
1575 ssp
.bh
= NILFS_SEGBUF_FIRST_BH(&segbuf
->sb_segsum_buffers
);
1576 ssp
.offset
= sizeof(struct nilfs_segment_summary
);
1578 list_for_each_entry(bh
, &segbuf
->sb_payload_buffers
, b_assoc_buffers
) {
1579 if (bh
== segbuf
->sb_super_root
)
1582 finfo
= nilfs_segctor_map_segsum_entry(
1583 sci
, &ssp
, sizeof(*finfo
));
1584 ino
= le64_to_cpu(finfo
->fi_ino
);
1585 nblocks
= le32_to_cpu(finfo
->fi_nblocks
);
1586 ndatablk
= le32_to_cpu(finfo
->fi_ndatablk
);
1588 inode
= bh
->b_page
->mapping
->host
;
1590 if (mode
== SC_LSEG_DSYNC
)
1591 sc_op
= &nilfs_sc_dsync_ops
;
1592 else if (ino
== NILFS_DAT_INO
)
1593 sc_op
= &nilfs_sc_dat_ops
;
1594 else /* file blocks */
1595 sc_op
= &nilfs_sc_file_ops
;
1599 err
= nilfs_bmap_assign(NILFS_I(inode
)->i_bmap
, &bh
, blocknr
,
1602 nilfs_list_replace_buffer(bh_org
, bh
);
1608 sc_op
->write_data_binfo(sci
, &ssp
, &binfo
);
1610 sc_op
->write_node_binfo(sci
, &ssp
, &binfo
);
1613 if (--nblocks
== 0) {
1617 } else if (ndatablk
> 0)
1627 static int nilfs_segctor_assign(struct nilfs_sc_info
*sci
, int mode
)
1629 struct nilfs_segment_buffer
*segbuf
;
1632 list_for_each_entry(segbuf
, &sci
->sc_segbufs
, sb_list
) {
1633 err
= nilfs_segctor_update_payload_blocknr(sci
, segbuf
, mode
);
1636 nilfs_segbuf_fill_in_segsum(segbuf
);
1641 static void nilfs_begin_page_io(struct page
*page
)
1643 if (!page
|| PageWriteback(page
))
1645 * For split b-tree node pages, this function may be called
1646 * twice. We ignore the 2nd or later calls by this check.
1651 clear_page_dirty_for_io(page
);
1652 set_page_writeback(page
);
1656 static void nilfs_segctor_prepare_write(struct nilfs_sc_info
*sci
)
1658 struct nilfs_segment_buffer
*segbuf
;
1659 struct page
*bd_page
= NULL
, *fs_page
= NULL
;
1661 list_for_each_entry(segbuf
, &sci
->sc_segbufs
, sb_list
) {
1662 struct buffer_head
*bh
;
1664 list_for_each_entry(bh
, &segbuf
->sb_segsum_buffers
,
1666 if (bh
->b_page
!= bd_page
) {
1669 clear_page_dirty_for_io(bd_page
);
1670 set_page_writeback(bd_page
);
1671 unlock_page(bd_page
);
1673 bd_page
= bh
->b_page
;
1677 list_for_each_entry(bh
, &segbuf
->sb_payload_buffers
,
1679 set_buffer_async_write(bh
);
1680 if (bh
== segbuf
->sb_super_root
) {
1681 if (bh
->b_page
!= bd_page
) {
1683 clear_page_dirty_for_io(bd_page
);
1684 set_page_writeback(bd_page
);
1685 unlock_page(bd_page
);
1686 bd_page
= bh
->b_page
;
1690 if (bh
->b_page
!= fs_page
) {
1691 nilfs_begin_page_io(fs_page
);
1692 fs_page
= bh
->b_page
;
1698 clear_page_dirty_for_io(bd_page
);
1699 set_page_writeback(bd_page
);
1700 unlock_page(bd_page
);
1702 nilfs_begin_page_io(fs_page
);
1705 static int nilfs_segctor_write(struct nilfs_sc_info
*sci
,
1706 struct the_nilfs
*nilfs
)
1710 ret
= nilfs_write_logs(&sci
->sc_segbufs
, nilfs
);
1711 list_splice_tail_init(&sci
->sc_segbufs
, &sci
->sc_write_logs
);
1715 static void nilfs_end_page_io(struct page
*page
, int err
)
1720 if (buffer_nilfs_node(page_buffers(page
)) && !PageWriteback(page
)) {
1722 * For b-tree node pages, this function may be called twice
1723 * or more because they might be split in a segment.
1725 if (PageDirty(page
)) {
1727 * For pages holding split b-tree node buffers, dirty
1728 * flag on the buffers may be cleared discretely.
1729 * In that case, the page is once redirtied for
1730 * remaining buffers, and it must be cancelled if
1731 * all the buffers get cleaned later.
1734 if (nilfs_page_buffers_clean(page
))
1735 __nilfs_clear_page_dirty(page
);
1742 if (!nilfs_page_buffers_clean(page
))
1743 __set_page_dirty_nobuffers(page
);
1744 ClearPageError(page
);
1746 __set_page_dirty_nobuffers(page
);
1750 end_page_writeback(page
);
1753 static void nilfs_abort_logs(struct list_head
*logs
, int err
)
1755 struct nilfs_segment_buffer
*segbuf
;
1756 struct page
*bd_page
= NULL
, *fs_page
= NULL
;
1757 struct buffer_head
*bh
;
1759 if (list_empty(logs
))
1762 list_for_each_entry(segbuf
, logs
, sb_list
) {
1763 list_for_each_entry(bh
, &segbuf
->sb_segsum_buffers
,
1765 if (bh
->b_page
!= bd_page
) {
1767 end_page_writeback(bd_page
);
1768 bd_page
= bh
->b_page
;
1772 list_for_each_entry(bh
, &segbuf
->sb_payload_buffers
,
1774 clear_buffer_async_write(bh
);
1775 if (bh
== segbuf
->sb_super_root
) {
1776 if (bh
->b_page
!= bd_page
) {
1777 end_page_writeback(bd_page
);
1778 bd_page
= bh
->b_page
;
1782 if (bh
->b_page
!= fs_page
) {
1783 nilfs_end_page_io(fs_page
, err
);
1784 fs_page
= bh
->b_page
;
1789 end_page_writeback(bd_page
);
1791 nilfs_end_page_io(fs_page
, err
);
1794 static void nilfs_segctor_abort_construction(struct nilfs_sc_info
*sci
,
1795 struct the_nilfs
*nilfs
, int err
)
1800 list_splice_tail_init(&sci
->sc_write_logs
, &logs
);
1801 ret
= nilfs_wait_on_logs(&logs
);
1802 nilfs_abort_logs(&logs
, ret
? : err
);
1804 list_splice_tail_init(&sci
->sc_segbufs
, &logs
);
1805 nilfs_cancel_segusage(&logs
, nilfs
->ns_sufile
);
1806 nilfs_free_incomplete_logs(&logs
, nilfs
);
1808 if (sci
->sc_stage
.flags
& NILFS_CF_SUFREED
) {
1809 ret
= nilfs_sufile_cancel_freev(nilfs
->ns_sufile
,
1813 WARN_ON(ret
); /* do not happen */
1816 nilfs_destroy_logs(&logs
);
1819 static void nilfs_set_next_segment(struct the_nilfs
*nilfs
,
1820 struct nilfs_segment_buffer
*segbuf
)
1822 nilfs
->ns_segnum
= segbuf
->sb_segnum
;
1823 nilfs
->ns_nextnum
= segbuf
->sb_nextnum
;
1824 nilfs
->ns_pseg_offset
= segbuf
->sb_pseg_start
- segbuf
->sb_fseg_start
1825 + segbuf
->sb_sum
.nblocks
;
1826 nilfs
->ns_seg_seq
= segbuf
->sb_sum
.seg_seq
;
1827 nilfs
->ns_ctime
= segbuf
->sb_sum
.ctime
;
1830 static void nilfs_segctor_complete_write(struct nilfs_sc_info
*sci
)
1832 struct nilfs_segment_buffer
*segbuf
;
1833 struct page
*bd_page
= NULL
, *fs_page
= NULL
;
1834 struct the_nilfs
*nilfs
= sci
->sc_super
->s_fs_info
;
1835 int update_sr
= false;
1837 list_for_each_entry(segbuf
, &sci
->sc_write_logs
, sb_list
) {
1838 struct buffer_head
*bh
;
1840 list_for_each_entry(bh
, &segbuf
->sb_segsum_buffers
,
1842 set_buffer_uptodate(bh
);
1843 clear_buffer_dirty(bh
);
1844 if (bh
->b_page
!= bd_page
) {
1846 end_page_writeback(bd_page
);
1847 bd_page
= bh
->b_page
;
1851 * We assume that the buffers which belong to the same page
1852 * continue over the buffer list.
1853 * Under this assumption, the last BHs of pages is
1854 * identifiable by the discontinuity of bh->b_page
1855 * (page != fs_page).
1857 * For B-tree node blocks, however, this assumption is not
1858 * guaranteed. The cleanup code of B-tree node pages needs
1861 list_for_each_entry(bh
, &segbuf
->sb_payload_buffers
,
1863 const unsigned long set_bits
= BIT(BH_Uptodate
);
1864 const unsigned long clear_bits
=
1865 (BIT(BH_Dirty
) | BIT(BH_Async_Write
) |
1866 BIT(BH_Delay
) | BIT(BH_NILFS_Volatile
) |
1867 BIT(BH_NILFS_Redirected
));
1869 set_mask_bits(&bh
->b_state
, clear_bits
, set_bits
);
1870 if (bh
== segbuf
->sb_super_root
) {
1871 if (bh
->b_page
!= bd_page
) {
1872 end_page_writeback(bd_page
);
1873 bd_page
= bh
->b_page
;
1878 if (bh
->b_page
!= fs_page
) {
1879 nilfs_end_page_io(fs_page
, 0);
1880 fs_page
= bh
->b_page
;
1884 if (!nilfs_segbuf_simplex(segbuf
)) {
1885 if (segbuf
->sb_sum
.flags
& NILFS_SS_LOGBGN
) {
1886 set_bit(NILFS_SC_UNCLOSED
, &sci
->sc_flags
);
1887 sci
->sc_lseg_stime
= jiffies
;
1889 if (segbuf
->sb_sum
.flags
& NILFS_SS_LOGEND
)
1890 clear_bit(NILFS_SC_UNCLOSED
, &sci
->sc_flags
);
1894 * Since pages may continue over multiple segment buffers,
1895 * end of the last page must be checked outside of the loop.
1898 end_page_writeback(bd_page
);
1900 nilfs_end_page_io(fs_page
, 0);
1902 nilfs_drop_collected_inodes(&sci
->sc_dirty_files
);
1904 if (nilfs_doing_gc())
1905 nilfs_drop_collected_inodes(&sci
->sc_gc_inodes
);
1907 nilfs
->ns_nongc_ctime
= sci
->sc_seg_ctime
;
1909 sci
->sc_nblk_inc
+= sci
->sc_nblk_this_inc
;
1911 segbuf
= NILFS_LAST_SEGBUF(&sci
->sc_write_logs
);
1912 nilfs_set_next_segment(nilfs
, segbuf
);
1915 nilfs
->ns_flushed_device
= 0;
1916 nilfs_set_last_segment(nilfs
, segbuf
->sb_pseg_start
,
1917 segbuf
->sb_sum
.seg_seq
, nilfs
->ns_cno
++);
1919 clear_bit(NILFS_SC_HAVE_DELTA
, &sci
->sc_flags
);
1920 clear_bit(NILFS_SC_DIRTY
, &sci
->sc_flags
);
1921 set_bit(NILFS_SC_SUPER_ROOT
, &sci
->sc_flags
);
1922 nilfs_segctor_clear_metadata_dirty(sci
);
1924 clear_bit(NILFS_SC_SUPER_ROOT
, &sci
->sc_flags
);
1927 static int nilfs_segctor_wait(struct nilfs_sc_info
*sci
)
1931 ret
= nilfs_wait_on_logs(&sci
->sc_write_logs
);
1933 nilfs_segctor_complete_write(sci
);
1934 nilfs_destroy_logs(&sci
->sc_write_logs
);
1939 static int nilfs_segctor_collect_dirty_files(struct nilfs_sc_info
*sci
,
1940 struct the_nilfs
*nilfs
)
1942 struct nilfs_inode_info
*ii
, *n
;
1943 struct inode
*ifile
= sci
->sc_root
->ifile
;
1945 spin_lock(&nilfs
->ns_inode_lock
);
1947 list_for_each_entry_safe(ii
, n
, &nilfs
->ns_dirty_files
, i_dirty
) {
1949 struct buffer_head
*ibh
;
1952 spin_unlock(&nilfs
->ns_inode_lock
);
1953 err
= nilfs_ifile_get_inode_block(
1954 ifile
, ii
->vfs_inode
.i_ino
, &ibh
);
1955 if (unlikely(err
)) {
1956 nilfs_msg(sci
->sc_super
, KERN_WARNING
,
1957 "log writer: error %d getting inode block (ino=%lu)",
1958 err
, ii
->vfs_inode
.i_ino
);
1961 mark_buffer_dirty(ibh
);
1962 nilfs_mdt_mark_dirty(ifile
);
1963 spin_lock(&nilfs
->ns_inode_lock
);
1964 if (likely(!ii
->i_bh
))
1971 clear_bit(NILFS_I_QUEUED
, &ii
->i_state
);
1972 set_bit(NILFS_I_BUSY
, &ii
->i_state
);
1973 list_move_tail(&ii
->i_dirty
, &sci
->sc_dirty_files
);
1975 spin_unlock(&nilfs
->ns_inode_lock
);
1980 static void nilfs_segctor_drop_written_files(struct nilfs_sc_info
*sci
,
1981 struct the_nilfs
*nilfs
)
1983 struct nilfs_inode_info
*ii
, *n
;
1984 int during_mount
= !(sci
->sc_super
->s_flags
& MS_ACTIVE
);
1985 int defer_iput
= false;
1987 spin_lock(&nilfs
->ns_inode_lock
);
1988 list_for_each_entry_safe(ii
, n
, &sci
->sc_dirty_files
, i_dirty
) {
1989 if (!test_and_clear_bit(NILFS_I_UPDATED
, &ii
->i_state
) ||
1990 test_bit(NILFS_I_DIRTY
, &ii
->i_state
))
1993 clear_bit(NILFS_I_BUSY
, &ii
->i_state
);
1996 list_del_init(&ii
->i_dirty
);
1997 if (!ii
->vfs_inode
.i_nlink
|| during_mount
) {
1999 * Defer calling iput() to avoid deadlocks if
2000 * i_nlink == 0 or mount is not yet finished.
2002 list_add_tail(&ii
->i_dirty
, &sci
->sc_iput_queue
);
2005 spin_unlock(&nilfs
->ns_inode_lock
);
2006 iput(&ii
->vfs_inode
);
2007 spin_lock(&nilfs
->ns_inode_lock
);
2010 spin_unlock(&nilfs
->ns_inode_lock
);
2013 schedule_work(&sci
->sc_iput_work
);
2017 * Main procedure of segment constructor
2019 static int nilfs_segctor_do_construct(struct nilfs_sc_info
*sci
, int mode
)
2021 struct the_nilfs
*nilfs
= sci
->sc_super
->s_fs_info
;
2024 nilfs_sc_cstage_set(sci
, NILFS_ST_INIT
);
2025 sci
->sc_cno
= nilfs
->ns_cno
;
2027 err
= nilfs_segctor_collect_dirty_files(sci
, nilfs
);
2031 if (nilfs_test_metadata_dirty(nilfs
, sci
->sc_root
))
2032 set_bit(NILFS_SC_DIRTY
, &sci
->sc_flags
);
2034 if (nilfs_segctor_clean(sci
))
2038 sci
->sc_stage
.flags
&= ~NILFS_CF_HISTORY_MASK
;
2040 err
= nilfs_segctor_begin_construction(sci
, nilfs
);
2044 /* Update time stamp */
2045 sci
->sc_seg_ctime
= get_seconds();
2047 err
= nilfs_segctor_collect(sci
, nilfs
, mode
);
2051 /* Avoid empty segment */
2052 if (nilfs_sc_cstage_get(sci
) == NILFS_ST_DONE
&&
2053 nilfs_segbuf_empty(sci
->sc_curseg
)) {
2054 nilfs_segctor_abort_construction(sci
, nilfs
, 1);
2058 err
= nilfs_segctor_assign(sci
, mode
);
2062 if (sci
->sc_stage
.flags
& NILFS_CF_IFILE_STARTED
)
2063 nilfs_segctor_fill_in_file_bmap(sci
);
2065 if (mode
== SC_LSEG_SR
&&
2066 nilfs_sc_cstage_get(sci
) >= NILFS_ST_CPFILE
) {
2067 err
= nilfs_segctor_fill_in_checkpoint(sci
);
2069 goto failed_to_write
;
2071 nilfs_segctor_fill_in_super_root(sci
, nilfs
);
2073 nilfs_segctor_update_segusage(sci
, nilfs
->ns_sufile
);
2075 /* Write partial segments */
2076 nilfs_segctor_prepare_write(sci
);
2078 nilfs_add_checksums_on_logs(&sci
->sc_segbufs
,
2079 nilfs
->ns_crc_seed
);
2081 err
= nilfs_segctor_write(sci
, nilfs
);
2083 goto failed_to_write
;
2085 if (nilfs_sc_cstage_get(sci
) == NILFS_ST_DONE
||
2086 nilfs
->ns_blocksize_bits
!= PAGE_SHIFT
) {
2088 * At this point, we avoid double buffering
2089 * for blocksize < pagesize because page dirty
2090 * flag is turned off during write and dirty
2091 * buffers are not properly collected for
2092 * pages crossing over segments.
2094 err
= nilfs_segctor_wait(sci
);
2096 goto failed_to_write
;
2098 } while (nilfs_sc_cstage_get(sci
) != NILFS_ST_DONE
);
2101 nilfs_segctor_drop_written_files(sci
, nilfs
);
2105 if (sci
->sc_stage
.flags
& NILFS_CF_IFILE_STARTED
)
2106 nilfs_redirty_inodes(&sci
->sc_dirty_files
);
2109 if (nilfs_doing_gc())
2110 nilfs_redirty_inodes(&sci
->sc_gc_inodes
);
2111 nilfs_segctor_abort_construction(sci
, nilfs
, err
);
2116 * nilfs_segctor_start_timer - set timer of background write
2117 * @sci: nilfs_sc_info
2119 * If the timer has already been set, it ignores the new request.
2120 * This function MUST be called within a section locking the segment
2123 static void nilfs_segctor_start_timer(struct nilfs_sc_info
*sci
)
2125 spin_lock(&sci
->sc_state_lock
);
2126 if (!(sci
->sc_state
& NILFS_SEGCTOR_COMMIT
)) {
2127 sci
->sc_timer
.expires
= jiffies
+ sci
->sc_interval
;
2128 add_timer(&sci
->sc_timer
);
2129 sci
->sc_state
|= NILFS_SEGCTOR_COMMIT
;
2131 spin_unlock(&sci
->sc_state_lock
);
2134 static void nilfs_segctor_do_flush(struct nilfs_sc_info
*sci
, int bn
)
2136 spin_lock(&sci
->sc_state_lock
);
2137 if (!(sci
->sc_flush_request
& BIT(bn
))) {
2138 unsigned long prev_req
= sci
->sc_flush_request
;
2140 sci
->sc_flush_request
|= BIT(bn
);
2142 wake_up(&sci
->sc_wait_daemon
);
2144 spin_unlock(&sci
->sc_state_lock
);
2148 * nilfs_flush_segment - trigger a segment construction for resource control
2150 * @ino: inode number of the file to be flushed out.
2152 void nilfs_flush_segment(struct super_block
*sb
, ino_t ino
)
2154 struct the_nilfs
*nilfs
= sb
->s_fs_info
;
2155 struct nilfs_sc_info
*sci
= nilfs
->ns_writer
;
2157 if (!sci
|| nilfs_doing_construction())
2159 nilfs_segctor_do_flush(sci
, NILFS_MDT_INODE(sb
, ino
) ? ino
: 0);
2160 /* assign bit 0 to data files */
2163 struct nilfs_segctor_wait_request
{
2164 wait_queue_entry_t wq
;
2170 static int nilfs_segctor_sync(struct nilfs_sc_info
*sci
)
2172 struct nilfs_segctor_wait_request wait_req
;
2175 spin_lock(&sci
->sc_state_lock
);
2176 init_wait(&wait_req
.wq
);
2178 atomic_set(&wait_req
.done
, 0);
2179 wait_req
.seq
= ++sci
->sc_seq_request
;
2180 spin_unlock(&sci
->sc_state_lock
);
2182 init_waitqueue_entry(&wait_req
.wq
, current
);
2183 add_wait_queue(&sci
->sc_wait_request
, &wait_req
.wq
);
2184 set_current_state(TASK_INTERRUPTIBLE
);
2185 wake_up(&sci
->sc_wait_daemon
);
2188 if (atomic_read(&wait_req
.done
)) {
2192 if (!signal_pending(current
)) {
2199 finish_wait(&sci
->sc_wait_request
, &wait_req
.wq
);
2203 static void nilfs_segctor_wakeup(struct nilfs_sc_info
*sci
, int err
)
2205 struct nilfs_segctor_wait_request
*wrq
, *n
;
2206 unsigned long flags
;
2208 spin_lock_irqsave(&sci
->sc_wait_request
.lock
, flags
);
2209 list_for_each_entry_safe(wrq
, n
, &sci
->sc_wait_request
.head
, wq
.entry
) {
2210 if (!atomic_read(&wrq
->done
) &&
2211 nilfs_cnt32_ge(sci
->sc_seq_done
, wrq
->seq
)) {
2213 atomic_set(&wrq
->done
, 1);
2215 if (atomic_read(&wrq
->done
)) {
2216 wrq
->wq
.func(&wrq
->wq
,
2217 TASK_UNINTERRUPTIBLE
| TASK_INTERRUPTIBLE
,
2221 spin_unlock_irqrestore(&sci
->sc_wait_request
.lock
, flags
);
2225 * nilfs_construct_segment - construct a logical segment
2228 * Return Value: On success, 0 is retured. On errors, one of the following
2229 * negative error code is returned.
2231 * %-EROFS - Read only filesystem.
2235 * %-ENOSPC - No space left on device (only in a panic state).
2237 * %-ERESTARTSYS - Interrupted.
2239 * %-ENOMEM - Insufficient memory available.
2241 int nilfs_construct_segment(struct super_block
*sb
)
2243 struct the_nilfs
*nilfs
= sb
->s_fs_info
;
2244 struct nilfs_sc_info
*sci
= nilfs
->ns_writer
;
2245 struct nilfs_transaction_info
*ti
;
2251 /* A call inside transactions causes a deadlock. */
2252 BUG_ON((ti
= current
->journal_info
) && ti
->ti_magic
== NILFS_TI_MAGIC
);
2254 err
= nilfs_segctor_sync(sci
);
2259 * nilfs_construct_dsync_segment - construct a data-only logical segment
2261 * @inode: inode whose data blocks should be written out
2262 * @start: start byte offset
2263 * @end: end byte offset (inclusive)
2265 * Return Value: On success, 0 is retured. On errors, one of the following
2266 * negative error code is returned.
2268 * %-EROFS - Read only filesystem.
2272 * %-ENOSPC - No space left on device (only in a panic state).
2274 * %-ERESTARTSYS - Interrupted.
2276 * %-ENOMEM - Insufficient memory available.
2278 int nilfs_construct_dsync_segment(struct super_block
*sb
, struct inode
*inode
,
2279 loff_t start
, loff_t end
)
2281 struct the_nilfs
*nilfs
= sb
->s_fs_info
;
2282 struct nilfs_sc_info
*sci
= nilfs
->ns_writer
;
2283 struct nilfs_inode_info
*ii
;
2284 struct nilfs_transaction_info ti
;
2290 nilfs_transaction_lock(sb
, &ti
, 0);
2292 ii
= NILFS_I(inode
);
2293 if (test_bit(NILFS_I_INODE_SYNC
, &ii
->i_state
) ||
2294 nilfs_test_opt(nilfs
, STRICT_ORDER
) ||
2295 test_bit(NILFS_SC_UNCLOSED
, &sci
->sc_flags
) ||
2296 nilfs_discontinued(nilfs
)) {
2297 nilfs_transaction_unlock(sb
);
2298 err
= nilfs_segctor_sync(sci
);
2302 spin_lock(&nilfs
->ns_inode_lock
);
2303 if (!test_bit(NILFS_I_QUEUED
, &ii
->i_state
) &&
2304 !test_bit(NILFS_I_BUSY
, &ii
->i_state
)) {
2305 spin_unlock(&nilfs
->ns_inode_lock
);
2306 nilfs_transaction_unlock(sb
);
2309 spin_unlock(&nilfs
->ns_inode_lock
);
2310 sci
->sc_dsync_inode
= ii
;
2311 sci
->sc_dsync_start
= start
;
2312 sci
->sc_dsync_end
= end
;
2314 err
= nilfs_segctor_do_construct(sci
, SC_LSEG_DSYNC
);
2316 nilfs
->ns_flushed_device
= 0;
2318 nilfs_transaction_unlock(sb
);
2322 #define FLUSH_FILE_BIT (0x1) /* data file only */
2323 #define FLUSH_DAT_BIT BIT(NILFS_DAT_INO) /* DAT only */
2326 * nilfs_segctor_accept - record accepted sequence count of log-write requests
2327 * @sci: segment constructor object
2329 static void nilfs_segctor_accept(struct nilfs_sc_info
*sci
)
2331 spin_lock(&sci
->sc_state_lock
);
2332 sci
->sc_seq_accepted
= sci
->sc_seq_request
;
2333 spin_unlock(&sci
->sc_state_lock
);
2334 del_timer_sync(&sci
->sc_timer
);
2338 * nilfs_segctor_notify - notify the result of request to caller threads
2339 * @sci: segment constructor object
2340 * @mode: mode of log forming
2341 * @err: error code to be notified
2343 static void nilfs_segctor_notify(struct nilfs_sc_info
*sci
, int mode
, int err
)
2345 /* Clear requests (even when the construction failed) */
2346 spin_lock(&sci
->sc_state_lock
);
2348 if (mode
== SC_LSEG_SR
) {
2349 sci
->sc_state
&= ~NILFS_SEGCTOR_COMMIT
;
2350 sci
->sc_seq_done
= sci
->sc_seq_accepted
;
2351 nilfs_segctor_wakeup(sci
, err
);
2352 sci
->sc_flush_request
= 0;
2354 if (mode
== SC_FLUSH_FILE
)
2355 sci
->sc_flush_request
&= ~FLUSH_FILE_BIT
;
2356 else if (mode
== SC_FLUSH_DAT
)
2357 sci
->sc_flush_request
&= ~FLUSH_DAT_BIT
;
2359 /* re-enable timer if checkpoint creation was not done */
2360 if ((sci
->sc_state
& NILFS_SEGCTOR_COMMIT
) &&
2361 time_before(jiffies
, sci
->sc_timer
.expires
))
2362 add_timer(&sci
->sc_timer
);
2364 spin_unlock(&sci
->sc_state_lock
);
2368 * nilfs_segctor_construct - form logs and write them to disk
2369 * @sci: segment constructor object
2370 * @mode: mode of log forming
2372 static int nilfs_segctor_construct(struct nilfs_sc_info
*sci
, int mode
)
2374 struct the_nilfs
*nilfs
= sci
->sc_super
->s_fs_info
;
2375 struct nilfs_super_block
**sbp
;
2378 nilfs_segctor_accept(sci
);
2380 if (nilfs_discontinued(nilfs
))
2382 if (!nilfs_segctor_confirm(sci
))
2383 err
= nilfs_segctor_do_construct(sci
, mode
);
2386 if (mode
!= SC_FLUSH_DAT
)
2387 atomic_set(&nilfs
->ns_ndirtyblks
, 0);
2388 if (test_bit(NILFS_SC_SUPER_ROOT
, &sci
->sc_flags
) &&
2389 nilfs_discontinued(nilfs
)) {
2390 down_write(&nilfs
->ns_sem
);
2392 sbp
= nilfs_prepare_super(sci
->sc_super
,
2393 nilfs_sb_will_flip(nilfs
));
2395 nilfs_set_log_cursor(sbp
[0], nilfs
);
2396 err
= nilfs_commit_super(sci
->sc_super
,
2399 up_write(&nilfs
->ns_sem
);
2403 nilfs_segctor_notify(sci
, mode
, err
);
2407 static void nilfs_construction_timeout(unsigned long data
)
2409 struct task_struct
*p
= (struct task_struct
*)data
;
2415 nilfs_remove_written_gcinodes(struct the_nilfs
*nilfs
, struct list_head
*head
)
2417 struct nilfs_inode_info
*ii
, *n
;
2419 list_for_each_entry_safe(ii
, n
, head
, i_dirty
) {
2420 if (!test_bit(NILFS_I_UPDATED
, &ii
->i_state
))
2422 list_del_init(&ii
->i_dirty
);
2423 truncate_inode_pages(&ii
->vfs_inode
.i_data
, 0);
2424 nilfs_btnode_cache_clear(&ii
->i_btnode_cache
);
2425 iput(&ii
->vfs_inode
);
2429 int nilfs_clean_segments(struct super_block
*sb
, struct nilfs_argv
*argv
,
2432 struct the_nilfs
*nilfs
= sb
->s_fs_info
;
2433 struct nilfs_sc_info
*sci
= nilfs
->ns_writer
;
2434 struct nilfs_transaction_info ti
;
2440 nilfs_transaction_lock(sb
, &ti
, 1);
2442 err
= nilfs_mdt_save_to_shadow_map(nilfs
->ns_dat
);
2446 err
= nilfs_ioctl_prepare_clean_segments(nilfs
, argv
, kbufs
);
2447 if (unlikely(err
)) {
2448 nilfs_mdt_restore_from_shadow_map(nilfs
->ns_dat
);
2452 sci
->sc_freesegs
= kbufs
[4];
2453 sci
->sc_nfreesegs
= argv
[4].v_nmembs
;
2454 list_splice_tail_init(&nilfs
->ns_gc_inodes
, &sci
->sc_gc_inodes
);
2457 err
= nilfs_segctor_construct(sci
, SC_LSEG_SR
);
2458 nilfs_remove_written_gcinodes(nilfs
, &sci
->sc_gc_inodes
);
2463 nilfs_msg(sb
, KERN_WARNING
, "error %d cleaning segments", err
);
2464 set_current_state(TASK_INTERRUPTIBLE
);
2465 schedule_timeout(sci
->sc_interval
);
2467 if (nilfs_test_opt(nilfs
, DISCARD
)) {
2468 int ret
= nilfs_discard_segments(nilfs
, sci
->sc_freesegs
,
2471 nilfs_msg(sb
, KERN_WARNING
,
2472 "error %d on discard request, turning discards off for the device",
2474 nilfs_clear_opt(nilfs
, DISCARD
);
2479 sci
->sc_freesegs
= NULL
;
2480 sci
->sc_nfreesegs
= 0;
2481 nilfs_mdt_clear_shadow_map(nilfs
->ns_dat
);
2482 nilfs_transaction_unlock(sb
);
2486 static void nilfs_segctor_thread_construct(struct nilfs_sc_info
*sci
, int mode
)
2488 struct nilfs_transaction_info ti
;
2490 nilfs_transaction_lock(sci
->sc_super
, &ti
, 0);
2491 nilfs_segctor_construct(sci
, mode
);
2494 * Unclosed segment should be retried. We do this using sc_timer.
2495 * Timeout of sc_timer will invoke complete construction which leads
2496 * to close the current logical segment.
2498 if (test_bit(NILFS_SC_UNCLOSED
, &sci
->sc_flags
))
2499 nilfs_segctor_start_timer(sci
);
2501 nilfs_transaction_unlock(sci
->sc_super
);
2504 static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info
*sci
)
2508 spin_lock(&sci
->sc_state_lock
);
2509 mode
= (sci
->sc_flush_request
& FLUSH_DAT_BIT
) ?
2510 SC_FLUSH_DAT
: SC_FLUSH_FILE
;
2511 spin_unlock(&sci
->sc_state_lock
);
2514 nilfs_segctor_do_construct(sci
, mode
);
2516 spin_lock(&sci
->sc_state_lock
);
2517 sci
->sc_flush_request
&= (mode
== SC_FLUSH_FILE
) ?
2518 ~FLUSH_FILE_BIT
: ~FLUSH_DAT_BIT
;
2519 spin_unlock(&sci
->sc_state_lock
);
2521 clear_bit(NILFS_SC_PRIOR_FLUSH
, &sci
->sc_flags
);
2524 static int nilfs_segctor_flush_mode(struct nilfs_sc_info
*sci
)
2526 if (!test_bit(NILFS_SC_UNCLOSED
, &sci
->sc_flags
) ||
2527 time_before(jiffies
, sci
->sc_lseg_stime
+ sci
->sc_mjcp_freq
)) {
2528 if (!(sci
->sc_flush_request
& ~FLUSH_FILE_BIT
))
2529 return SC_FLUSH_FILE
;
2530 else if (!(sci
->sc_flush_request
& ~FLUSH_DAT_BIT
))
2531 return SC_FLUSH_DAT
;
2537 * nilfs_segctor_thread - main loop of the segment constructor thread.
2538 * @arg: pointer to a struct nilfs_sc_info.
2540 * nilfs_segctor_thread() initializes a timer and serves as a daemon
2541 * to execute segment constructions.
2543 static int nilfs_segctor_thread(void *arg
)
2545 struct nilfs_sc_info
*sci
= (struct nilfs_sc_info
*)arg
;
2546 struct the_nilfs
*nilfs
= sci
->sc_super
->s_fs_info
;
2549 sci
->sc_timer
.data
= (unsigned long)current
;
2550 sci
->sc_timer
.function
= nilfs_construction_timeout
;
2553 sci
->sc_task
= current
;
2554 wake_up(&sci
->sc_wait_task
); /* for nilfs_segctor_start_thread() */
2555 nilfs_msg(sci
->sc_super
, KERN_INFO
,
2556 "segctord starting. Construction interval = %lu seconds, CP frequency < %lu seconds",
2557 sci
->sc_interval
/ HZ
, sci
->sc_mjcp_freq
/ HZ
);
2559 spin_lock(&sci
->sc_state_lock
);
2564 if (sci
->sc_state
& NILFS_SEGCTOR_QUIT
)
2567 if (timeout
|| sci
->sc_seq_request
!= sci
->sc_seq_done
)
2569 else if (sci
->sc_flush_request
)
2570 mode
= nilfs_segctor_flush_mode(sci
);
2574 spin_unlock(&sci
->sc_state_lock
);
2575 nilfs_segctor_thread_construct(sci
, mode
);
2576 spin_lock(&sci
->sc_state_lock
);
2581 if (freezing(current
)) {
2582 spin_unlock(&sci
->sc_state_lock
);
2584 spin_lock(&sci
->sc_state_lock
);
2587 int should_sleep
= 1;
2589 prepare_to_wait(&sci
->sc_wait_daemon
, &wait
,
2590 TASK_INTERRUPTIBLE
);
2592 if (sci
->sc_seq_request
!= sci
->sc_seq_done
)
2594 else if (sci
->sc_flush_request
)
2596 else if (sci
->sc_state
& NILFS_SEGCTOR_COMMIT
)
2597 should_sleep
= time_before(jiffies
,
2598 sci
->sc_timer
.expires
);
2601 spin_unlock(&sci
->sc_state_lock
);
2603 spin_lock(&sci
->sc_state_lock
);
2605 finish_wait(&sci
->sc_wait_daemon
, &wait
);
2606 timeout
= ((sci
->sc_state
& NILFS_SEGCTOR_COMMIT
) &&
2607 time_after_eq(jiffies
, sci
->sc_timer
.expires
));
2609 if (nilfs_sb_dirty(nilfs
) && nilfs_sb_need_update(nilfs
))
2610 set_nilfs_discontinued(nilfs
);
2615 spin_unlock(&sci
->sc_state_lock
);
2618 sci
->sc_task
= NULL
;
2619 wake_up(&sci
->sc_wait_task
); /* for nilfs_segctor_kill_thread() */
2623 static int nilfs_segctor_start_thread(struct nilfs_sc_info
*sci
)
2625 struct task_struct
*t
;
2627 t
= kthread_run(nilfs_segctor_thread
, sci
, "segctord");
2629 int err
= PTR_ERR(t
);
2631 nilfs_msg(sci
->sc_super
, KERN_ERR
,
2632 "error %d creating segctord thread", err
);
2635 wait_event(sci
->sc_wait_task
, sci
->sc_task
!= NULL
);
2639 static void nilfs_segctor_kill_thread(struct nilfs_sc_info
*sci
)
2640 __acquires(&sci
->sc_state_lock
)
2641 __releases(&sci
->sc_state_lock
)
2643 sci
->sc_state
|= NILFS_SEGCTOR_QUIT
;
2645 while (sci
->sc_task
) {
2646 wake_up(&sci
->sc_wait_daemon
);
2647 spin_unlock(&sci
->sc_state_lock
);
2648 wait_event(sci
->sc_wait_task
, sci
->sc_task
== NULL
);
2649 spin_lock(&sci
->sc_state_lock
);
2654 * Setup & clean-up functions
2656 static struct nilfs_sc_info
*nilfs_segctor_new(struct super_block
*sb
,
2657 struct nilfs_root
*root
)
2659 struct the_nilfs
*nilfs
= sb
->s_fs_info
;
2660 struct nilfs_sc_info
*sci
;
2662 sci
= kzalloc(sizeof(*sci
), GFP_KERNEL
);
2668 nilfs_get_root(root
);
2669 sci
->sc_root
= root
;
2671 init_waitqueue_head(&sci
->sc_wait_request
);
2672 init_waitqueue_head(&sci
->sc_wait_daemon
);
2673 init_waitqueue_head(&sci
->sc_wait_task
);
2674 spin_lock_init(&sci
->sc_state_lock
);
2675 INIT_LIST_HEAD(&sci
->sc_dirty_files
);
2676 INIT_LIST_HEAD(&sci
->sc_segbufs
);
2677 INIT_LIST_HEAD(&sci
->sc_write_logs
);
2678 INIT_LIST_HEAD(&sci
->sc_gc_inodes
);
2679 INIT_LIST_HEAD(&sci
->sc_iput_queue
);
2680 INIT_WORK(&sci
->sc_iput_work
, nilfs_iput_work_func
);
2681 init_timer(&sci
->sc_timer
);
2683 sci
->sc_interval
= HZ
* NILFS_SC_DEFAULT_TIMEOUT
;
2684 sci
->sc_mjcp_freq
= HZ
* NILFS_SC_DEFAULT_SR_FREQ
;
2685 sci
->sc_watermark
= NILFS_SC_DEFAULT_WATERMARK
;
2687 if (nilfs
->ns_interval
)
2688 sci
->sc_interval
= HZ
* nilfs
->ns_interval
;
2689 if (nilfs
->ns_watermark
)
2690 sci
->sc_watermark
= nilfs
->ns_watermark
;
2694 static void nilfs_segctor_write_out(struct nilfs_sc_info
*sci
)
2696 int ret
, retrycount
= NILFS_SC_CLEANUP_RETRY
;
2699 * The segctord thread was stopped and its timer was removed.
2700 * But some tasks remain.
2703 struct nilfs_transaction_info ti
;
2705 nilfs_transaction_lock(sci
->sc_super
, &ti
, 0);
2706 ret
= nilfs_segctor_construct(sci
, SC_LSEG_SR
);
2707 nilfs_transaction_unlock(sci
->sc_super
);
2709 flush_work(&sci
->sc_iput_work
);
2711 } while (ret
&& retrycount
-- > 0);
2715 * nilfs_segctor_destroy - destroy the segment constructor.
2716 * @sci: nilfs_sc_info
2718 * nilfs_segctor_destroy() kills the segctord thread and frees
2719 * the nilfs_sc_info struct.
2720 * Caller must hold the segment semaphore.
2722 static void nilfs_segctor_destroy(struct nilfs_sc_info
*sci
)
2724 struct the_nilfs
*nilfs
= sci
->sc_super
->s_fs_info
;
2727 up_write(&nilfs
->ns_segctor_sem
);
2729 spin_lock(&sci
->sc_state_lock
);
2730 nilfs_segctor_kill_thread(sci
);
2731 flag
= ((sci
->sc_state
& NILFS_SEGCTOR_COMMIT
) || sci
->sc_flush_request
2732 || sci
->sc_seq_request
!= sci
->sc_seq_done
);
2733 spin_unlock(&sci
->sc_state_lock
);
2735 if (flush_work(&sci
->sc_iput_work
))
2738 if (flag
|| !nilfs_segctor_confirm(sci
))
2739 nilfs_segctor_write_out(sci
);
2741 if (!list_empty(&sci
->sc_dirty_files
)) {
2742 nilfs_msg(sci
->sc_super
, KERN_WARNING
,
2743 "disposed unprocessed dirty file(s) when stopping log writer");
2744 nilfs_dispose_list(nilfs
, &sci
->sc_dirty_files
, 1);
2747 if (!list_empty(&sci
->sc_iput_queue
)) {
2748 nilfs_msg(sci
->sc_super
, KERN_WARNING
,
2749 "disposed unprocessed inode(s) in iput queue when stopping log writer");
2750 nilfs_dispose_list(nilfs
, &sci
->sc_iput_queue
, 1);
2753 WARN_ON(!list_empty(&sci
->sc_segbufs
));
2754 WARN_ON(!list_empty(&sci
->sc_write_logs
));
2756 nilfs_put_root(sci
->sc_root
);
2758 down_write(&nilfs
->ns_segctor_sem
);
2760 del_timer_sync(&sci
->sc_timer
);
2765 * nilfs_attach_log_writer - attach log writer
2766 * @sb: super block instance
2767 * @root: root object of the current filesystem tree
2769 * This allocates a log writer object, initializes it, and starts the
2772 * Return Value: On success, 0 is returned. On error, one of the following
2773 * negative error code is returned.
2775 * %-ENOMEM - Insufficient memory available.
2777 int nilfs_attach_log_writer(struct super_block
*sb
, struct nilfs_root
*root
)
2779 struct the_nilfs
*nilfs
= sb
->s_fs_info
;
2782 if (nilfs
->ns_writer
) {
2784 * This happens if the filesystem was remounted
2785 * read/write after nilfs_error degenerated it into a
2788 nilfs_detach_log_writer(sb
);
2791 nilfs
->ns_writer
= nilfs_segctor_new(sb
, root
);
2792 if (!nilfs
->ns_writer
)
2795 err
= nilfs_segctor_start_thread(nilfs
->ns_writer
);
2797 kfree(nilfs
->ns_writer
);
2798 nilfs
->ns_writer
= NULL
;
2804 * nilfs_detach_log_writer - destroy log writer
2805 * @sb: super block instance
2807 * This kills log writer daemon, frees the log writer object, and
2808 * destroys list of dirty files.
2810 void nilfs_detach_log_writer(struct super_block
*sb
)
2812 struct the_nilfs
*nilfs
= sb
->s_fs_info
;
2813 LIST_HEAD(garbage_list
);
2815 down_write(&nilfs
->ns_segctor_sem
);
2816 if (nilfs
->ns_writer
) {
2817 nilfs_segctor_destroy(nilfs
->ns_writer
);
2818 nilfs
->ns_writer
= NULL
;
2821 /* Force to free the list of dirty files */
2822 spin_lock(&nilfs
->ns_inode_lock
);
2823 if (!list_empty(&nilfs
->ns_dirty_files
)) {
2824 list_splice_init(&nilfs
->ns_dirty_files
, &garbage_list
);
2825 nilfs_msg(sb
, KERN_WARNING
,
2826 "disposed unprocessed dirty file(s) when detaching log writer");
2828 spin_unlock(&nilfs
->ns_inode_lock
);
2829 up_write(&nilfs
->ns_segctor_sem
);
2831 nilfs_dispose_list(nilfs
, &garbage_list
, 1);