blob: bd88a7461063bba02f31c6f873902c9c8e87e943 [file] [log] [blame]
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090035#include <linux/slab.h>
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070036#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"
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070043#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,
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070070 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 */
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +090082#define NILFS_CF_SUFREED 0x0004 /* segment usages has been freed */
83#define NILFS_CF_HISTORY_MASK (NILFS_CF_IFILE_STARTED | NILFS_CF_SUFREED)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070084
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 *);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900107static void nilfs_dispose_list(struct the_nilfs *, struct list_head *, int);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700108
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
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700118static 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,
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700129 * it is saved and will be restored on
130 * nilfs_transaction_commit().
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700131 */
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
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700161 * exclusive. The function is used with nilfs_transaction_commit() in pairs.
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700162 * 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
Ryusuke Konishi7a650042010-03-14 03:32:40 +0900168 * instead; otherwise a new struct is assigned from a slab.
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700169 *
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 *
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700178 * %-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{
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700184 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
Jan Kara2c22b332012-06-12 16:20:44 +0200192 sb_start_intwrite(sb);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900193
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900194 nilfs = sb->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700195 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);
Jan Kara2c22b332012-06-12 16:20:44 +0200208 sb_end_intwrite(sb);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700209 return ret;
210}
211
212/**
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700213 * nilfs_transaction_commit - commit indivisible file operations.
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700214 * @sb: super block
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700215 *
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700216 * nilfs_transaction_commit() releases the read semaphore which is
217 * acquired by nilfs_transaction_begin(). This is only performed
218 * in outermost call of this function. If a commit flag is set,
219 * nilfs_transaction_commit() sets a timer to start the segment
220 * constructor. If a sync flag is set, it starts construction
221 * directly.
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700222 */
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700223int nilfs_transaction_commit(struct super_block *sb)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700224{
225 struct nilfs_transaction_info *ti = current->journal_info;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900226 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700227 int err = 0;
228
229 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700230 ti->ti_flags |= NILFS_TI_COMMIT;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700231 if (ti->ti_count > 0) {
232 ti->ti_count--;
233 return 0;
234 }
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +0900235 if (nilfs->ns_writer) {
236 struct nilfs_sc_info *sci = nilfs->ns_writer;
237
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700238 if (ti->ti_flags & NILFS_TI_COMMIT)
239 nilfs_segctor_start_timer(sci);
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +0900240 if (atomic_read(&nilfs->ns_ndirtyblks) > sci->sc_watermark)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700241 nilfs_segctor_do_flush(sci, 0);
242 }
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +0900243 up_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700244 current->journal_info = ti->ti_save;
245
246 if (ti->ti_flags & NILFS_TI_SYNC)
247 err = nilfs_construct_segment(sb);
248 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
249 kmem_cache_free(nilfs_transaction_cachep, ti);
Jan Kara2c22b332012-06-12 16:20:44 +0200250 sb_end_intwrite(sb);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700251 return err;
252}
253
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700254void nilfs_transaction_abort(struct super_block *sb)
255{
256 struct nilfs_transaction_info *ti = current->journal_info;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900257 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700258
259 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
260 if (ti->ti_count > 0) {
261 ti->ti_count--;
262 return;
263 }
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900264 up_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700265
266 current->journal_info = ti->ti_save;
267 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
268 kmem_cache_free(nilfs_transaction_cachep, ti);
Jan Kara2c22b332012-06-12 16:20:44 +0200269 sb_end_intwrite(sb);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700270}
271
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700272void nilfs_relax_pressure_in_lock(struct super_block *sb)
273{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900274 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +0900275 struct nilfs_sc_info *sci = nilfs->ns_writer;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700276
277 if (!sci || !sci->sc_flush_request)
278 return;
279
280 set_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags);
281 up_read(&nilfs->ns_segctor_sem);
282
283 down_write(&nilfs->ns_segctor_sem);
284 if (sci->sc_flush_request &&
285 test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags)) {
286 struct nilfs_transaction_info *ti = current->journal_info;
287
288 ti->ti_flags |= NILFS_TI_WRITER;
289 nilfs_segctor_do_immediate_flush(sci);
290 ti->ti_flags &= ~NILFS_TI_WRITER;
291 }
292 downgrade_write(&nilfs->ns_segctor_sem);
293}
294
Ryusuke Konishif7545142011-03-09 11:05:08 +0900295static void nilfs_transaction_lock(struct super_block *sb,
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700296 struct nilfs_transaction_info *ti,
297 int gcflag)
298{
299 struct nilfs_transaction_info *cur_ti = current->journal_info;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900300 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +0900301 struct nilfs_sc_info *sci = nilfs->ns_writer;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700302
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700303 WARN_ON(cur_ti);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700304 ti->ti_flags = NILFS_TI_WRITER;
305 ti->ti_count = 0;
306 ti->ti_save = cur_ti;
307 ti->ti_magic = NILFS_TI_MAGIC;
308 INIT_LIST_HEAD(&ti->ti_garbage);
309 current->journal_info = ti;
310
311 for (;;) {
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +0900312 down_write(&nilfs->ns_segctor_sem);
313 if (!test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700314 break;
315
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +0900316 nilfs_segctor_do_immediate_flush(sci);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700317
Ryusuke Konishif7545142011-03-09 11:05:08 +0900318 up_write(&nilfs->ns_segctor_sem);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700319 yield();
320 }
321 if (gcflag)
322 ti->ti_flags |= NILFS_TI_GC;
323}
324
Ryusuke Konishif7545142011-03-09 11:05:08 +0900325static void nilfs_transaction_unlock(struct super_block *sb)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700326{
327 struct nilfs_transaction_info *ti = current->journal_info;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900328 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700329
330 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
331 BUG_ON(ti->ti_count > 0);
332
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900333 up_write(&nilfs->ns_segctor_sem);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700334 current->journal_info = ti->ti_save;
335 if (!list_empty(&ti->ti_garbage))
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900336 nilfs_dispose_list(nilfs, &ti->ti_garbage, 0);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700337}
338
339static void *nilfs_segctor_map_segsum_entry(struct nilfs_sc_info *sci,
340 struct nilfs_segsum_pointer *ssp,
341 unsigned bytes)
342{
343 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
344 unsigned blocksize = sci->sc_super->s_blocksize;
345 void *p;
346
347 if (unlikely(ssp->offset + bytes > blocksize)) {
348 ssp->offset = 0;
349 BUG_ON(NILFS_SEGBUF_BH_IS_LAST(ssp->bh,
350 &segbuf->sb_segsum_buffers));
351 ssp->bh = NILFS_SEGBUF_NEXT_BH(ssp->bh);
352 }
353 p = ssp->bh->b_data + ssp->offset;
354 ssp->offset += bytes;
355 return p;
356}
357
358/**
359 * nilfs_segctor_reset_segment_buffer - reset the current segment buffer
360 * @sci: nilfs_sc_info
361 */
362static int nilfs_segctor_reset_segment_buffer(struct nilfs_sc_info *sci)
363{
364 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
365 struct buffer_head *sumbh;
366 unsigned sumbytes;
367 unsigned flags = 0;
368 int err;
369
370 if (nilfs_doing_gc())
371 flags = NILFS_SS_GC;
Ryusuke Konishi6c43f412010-08-20 20:10:38 +0900372 err = nilfs_segbuf_reset(segbuf, flags, sci->sc_seg_ctime, sci->sc_cno);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700373 if (unlikely(err))
374 return err;
375
376 sumbh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers);
377 sumbytes = segbuf->sb_sum.sumbytes;
378 sci->sc_finfo_ptr.bh = sumbh; sci->sc_finfo_ptr.offset = sumbytes;
379 sci->sc_binfo_ptr.bh = sumbh; sci->sc_binfo_ptr.offset = sumbytes;
380 sci->sc_blk_cnt = sci->sc_datablk_cnt = 0;
381 return 0;
382}
383
384static int nilfs_segctor_feed_segment(struct nilfs_sc_info *sci)
385{
386 sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
387 if (NILFS_SEGBUF_IS_LAST(sci->sc_curseg, &sci->sc_segbufs))
388 return -E2BIG; /* The current segment is filled up
389 (internal code) */
390 sci->sc_curseg = NILFS_NEXT_SEGBUF(sci->sc_curseg);
391 return nilfs_segctor_reset_segment_buffer(sci);
392}
393
394static int nilfs_segctor_add_super_root(struct nilfs_sc_info *sci)
395{
396 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
397 int err;
398
399 if (segbuf->sb_sum.nblocks >= segbuf->sb_rest_blocks) {
400 err = nilfs_segctor_feed_segment(sci);
401 if (err)
402 return err;
403 segbuf = sci->sc_curseg;
404 }
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +0900405 err = nilfs_segbuf_extend_payload(segbuf, &segbuf->sb_super_root);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700406 if (likely(!err))
407 segbuf->sb_sum.flags |= NILFS_SS_SR;
408 return err;
409}
410
411/*
412 * Functions for making segment summary and payloads
413 */
414static int nilfs_segctor_segsum_block_required(
415 struct nilfs_sc_info *sci, const struct nilfs_segsum_pointer *ssp,
416 unsigned binfo_size)
417{
418 unsigned blocksize = sci->sc_super->s_blocksize;
419 /* Size of finfo and binfo is enough small against blocksize */
420
421 return ssp->offset + binfo_size +
422 (!sci->sc_blk_cnt ? sizeof(struct nilfs_finfo) : 0) >
423 blocksize;
424}
425
426static void nilfs_segctor_begin_finfo(struct nilfs_sc_info *sci,
427 struct inode *inode)
428{
429 sci->sc_curseg->sb_sum.nfinfo++;
430 sci->sc_binfo_ptr = sci->sc_finfo_ptr;
431 nilfs_segctor_map_segsum_entry(
432 sci, &sci->sc_binfo_ptr, sizeof(struct nilfs_finfo));
Ryusuke Konishic96fa462009-04-06 19:01:57 -0700433
Ryusuke Konishi72746ac2011-02-28 13:41:11 +0900434 if (NILFS_I(inode)->i_root &&
435 !test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags))
Ryusuke Konishic96fa462009-04-06 19:01:57 -0700436 set_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700437 /* skip finfo */
438}
439
440static void nilfs_segctor_end_finfo(struct nilfs_sc_info *sci,
441 struct inode *inode)
442{
443 struct nilfs_finfo *finfo;
444 struct nilfs_inode_info *ii;
445 struct nilfs_segment_buffer *segbuf;
Ryusuke Konishi6c43f412010-08-20 20:10:38 +0900446 __u64 cno;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700447
448 if (sci->sc_blk_cnt == 0)
449 return;
450
451 ii = NILFS_I(inode);
Ryusuke Konishi6c43f412010-08-20 20:10:38 +0900452
453 if (test_bit(NILFS_I_GCINODE, &ii->i_state))
454 cno = ii->i_cno;
455 else if (NILFS_ROOT_METADATA_FILE(inode->i_ino))
456 cno = 0;
457 else
458 cno = sci->sc_cno;
459
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700460 finfo = nilfs_segctor_map_segsum_entry(sci, &sci->sc_finfo_ptr,
461 sizeof(*finfo));
462 finfo->fi_ino = cpu_to_le64(inode->i_ino);
463 finfo->fi_nblocks = cpu_to_le32(sci->sc_blk_cnt);
464 finfo->fi_ndatablk = cpu_to_le32(sci->sc_datablk_cnt);
Ryusuke Konishi6c43f412010-08-20 20:10:38 +0900465 finfo->fi_cno = cpu_to_le64(cno);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700466
467 segbuf = sci->sc_curseg;
468 segbuf->sb_sum.sumbytes = sci->sc_binfo_ptr.offset +
469 sci->sc_super->s_blocksize * (segbuf->sb_sum.nsumblk - 1);
470 sci->sc_finfo_ptr = sci->sc_binfo_ptr;
471 sci->sc_blk_cnt = sci->sc_datablk_cnt = 0;
472}
473
474static int nilfs_segctor_add_file_block(struct nilfs_sc_info *sci,
475 struct buffer_head *bh,
476 struct inode *inode,
477 unsigned binfo_size)
478{
479 struct nilfs_segment_buffer *segbuf;
480 int required, err = 0;
481
482 retry:
483 segbuf = sci->sc_curseg;
484 required = nilfs_segctor_segsum_block_required(
485 sci, &sci->sc_binfo_ptr, binfo_size);
486 if (segbuf->sb_sum.nblocks + required + 1 > segbuf->sb_rest_blocks) {
487 nilfs_segctor_end_finfo(sci, inode);
488 err = nilfs_segctor_feed_segment(sci);
489 if (err)
490 return err;
491 goto retry;
492 }
493 if (unlikely(required)) {
494 err = nilfs_segbuf_extend_segsum(segbuf);
495 if (unlikely(err))
496 goto failed;
497 }
498 if (sci->sc_blk_cnt == 0)
499 nilfs_segctor_begin_finfo(sci, inode);
500
501 nilfs_segctor_map_segsum_entry(sci, &sci->sc_binfo_ptr, binfo_size);
502 /* Substitution to vblocknr is delayed until update_blocknr() */
503 nilfs_segbuf_add_file_buffer(segbuf, bh);
504 sci->sc_blk_cnt++;
505 failed:
506 return err;
507}
508
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700509/*
510 * Callback functions that enumerate, mark, and collect dirty blocks
511 */
512static int nilfs_collect_file_data(struct nilfs_sc_info *sci,
513 struct buffer_head *bh, struct inode *inode)
514{
515 int err;
516
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700517 err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
Ryusuke Konishie8289492010-11-19 15:26:20 +0900518 if (err < 0)
519 return err;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700520
521 err = nilfs_segctor_add_file_block(sci, bh, inode,
522 sizeof(struct nilfs_binfo_v));
523 if (!err)
524 sci->sc_datablk_cnt++;
525 return err;
526}
527
528static int nilfs_collect_file_node(struct nilfs_sc_info *sci,
529 struct buffer_head *bh,
530 struct inode *inode)
531{
Ryusuke Konishie8289492010-11-19 15:26:20 +0900532 return nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700533}
534
535static int nilfs_collect_file_bmap(struct nilfs_sc_info *sci,
536 struct buffer_head *bh,
537 struct inode *inode)
538{
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700539 WARN_ON(!buffer_dirty(bh));
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700540 return nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
541}
542
543static void nilfs_write_file_data_binfo(struct nilfs_sc_info *sci,
544 struct nilfs_segsum_pointer *ssp,
545 union nilfs_binfo *binfo)
546{
547 struct nilfs_binfo_v *binfo_v = nilfs_segctor_map_segsum_entry(
548 sci, ssp, sizeof(*binfo_v));
549 *binfo_v = binfo->bi_v;
550}
551
552static void nilfs_write_file_node_binfo(struct nilfs_sc_info *sci,
553 struct nilfs_segsum_pointer *ssp,
554 union nilfs_binfo *binfo)
555{
556 __le64 *vblocknr = nilfs_segctor_map_segsum_entry(
557 sci, ssp, sizeof(*vblocknr));
558 *vblocknr = binfo->bi_v.bi_vblocknr;
559}
560
Ryusuke Konishi4e819502010-04-23 17:35:23 +0900561static struct nilfs_sc_operations nilfs_sc_file_ops = {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700562 .collect_data = nilfs_collect_file_data,
563 .collect_node = nilfs_collect_file_node,
564 .collect_bmap = nilfs_collect_file_bmap,
565 .write_data_binfo = nilfs_write_file_data_binfo,
566 .write_node_binfo = nilfs_write_file_node_binfo,
567};
568
569static int nilfs_collect_dat_data(struct nilfs_sc_info *sci,
570 struct buffer_head *bh, struct inode *inode)
571{
572 int err;
573
574 err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
Ryusuke Konishie8289492010-11-19 15:26:20 +0900575 if (err < 0)
576 return err;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700577
578 err = nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
579 if (!err)
580 sci->sc_datablk_cnt++;
581 return err;
582}
583
584static int nilfs_collect_dat_bmap(struct nilfs_sc_info *sci,
585 struct buffer_head *bh, struct inode *inode)
586{
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700587 WARN_ON(!buffer_dirty(bh));
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700588 return nilfs_segctor_add_file_block(sci, bh, inode,
589 sizeof(struct nilfs_binfo_dat));
590}
591
592static void nilfs_write_dat_data_binfo(struct nilfs_sc_info *sci,
593 struct nilfs_segsum_pointer *ssp,
594 union nilfs_binfo *binfo)
595{
596 __le64 *blkoff = nilfs_segctor_map_segsum_entry(sci, ssp,
597 sizeof(*blkoff));
598 *blkoff = binfo->bi_dat.bi_blkoff;
599}
600
601static void nilfs_write_dat_node_binfo(struct nilfs_sc_info *sci,
602 struct nilfs_segsum_pointer *ssp,
603 union nilfs_binfo *binfo)
604{
605 struct nilfs_binfo_dat *binfo_dat =
606 nilfs_segctor_map_segsum_entry(sci, ssp, sizeof(*binfo_dat));
607 *binfo_dat = binfo->bi_dat;
608}
609
Ryusuke Konishi4e819502010-04-23 17:35:23 +0900610static struct nilfs_sc_operations nilfs_sc_dat_ops = {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700611 .collect_data = nilfs_collect_dat_data,
612 .collect_node = nilfs_collect_file_node,
613 .collect_bmap = nilfs_collect_dat_bmap,
614 .write_data_binfo = nilfs_write_dat_data_binfo,
615 .write_node_binfo = nilfs_write_dat_node_binfo,
616};
617
Ryusuke Konishi4e819502010-04-23 17:35:23 +0900618static struct nilfs_sc_operations nilfs_sc_dsync_ops = {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700619 .collect_data = nilfs_collect_file_data,
620 .collect_node = NULL,
621 .collect_bmap = NULL,
622 .write_data_binfo = nilfs_write_file_data_binfo,
623 .write_node_binfo = NULL,
624};
625
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700626static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode,
627 struct list_head *listp,
628 size_t nlimit,
629 loff_t start, loff_t end)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700630{
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700631 struct address_space *mapping = inode->i_mapping;
632 struct pagevec pvec;
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700633 pgoff_t index = 0, last = ULONG_MAX;
634 size_t ndirties = 0;
635 int i;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700636
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700637 if (unlikely(start != 0 || end != LLONG_MAX)) {
638 /*
639 * A valid range is given for sync-ing data pages. The
640 * range is rounded to per-page; extra dirty buffers
641 * may be included if blocksize < pagesize.
642 */
643 index = start >> PAGE_SHIFT;
644 last = end >> PAGE_SHIFT;
645 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700646 pagevec_init(&pvec, 0);
647 repeat:
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700648 if (unlikely(index > last) ||
649 !pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY,
650 min_t(pgoff_t, last - index,
651 PAGEVEC_SIZE - 1) + 1))
652 return ndirties;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700653
654 for (i = 0; i < pagevec_count(&pvec); i++) {
655 struct buffer_head *bh, *head;
656 struct page *page = pvec.pages[i];
657
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700658 if (unlikely(page->index > last))
659 break;
660
Ryusuke Konishiaa405b12011-05-05 12:56:51 +0900661 lock_page(page);
662 if (!page_has_buffers(page))
663 create_empty_buffers(page, 1 << inode->i_blkbits, 0);
664 unlock_page(page);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700665
666 bh = head = page_buffers(page);
667 do {
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700668 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;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700677 }
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700678 } while (bh = bh->b_this_page, bh != head);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700679 }
680 pagevec_release(&pvec);
681 cond_resched();
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700682 goto repeat;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700683}
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
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900715static void nilfs_dispose_list(struct the_nilfs *nilfs,
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700716 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)) {
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900723 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700724 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,
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900734 &nilfs->ns_dirty_files);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700735 continue;
736 }
737 ivec[nv++] = ii;
738 if (nv == SC_N_INODEVEC)
739 break;
740 }
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900741 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700742
743 for (pii = ivec; nv > 0; pii++, nv--)
744 iput(&(*pii)->vfs_inode);
745 }
746}
747
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900748static int nilfs_test_metadata_dirty(struct the_nilfs *nilfs,
749 struct nilfs_root *root)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700750{
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700751 int ret = 0;
752
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900753 if (nilfs_mdt_fetch_dirty(root->ifile))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700754 ret++;
755 if (nilfs_mdt_fetch_dirty(nilfs->ns_cpfile))
756 ret++;
757 if (nilfs_mdt_fetch_dirty(nilfs->ns_sufile))
758 ret++;
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900759 if ((ret || nilfs_doing_gc()) && nilfs_mdt_fetch_dirty(nilfs->ns_dat))
760 ret++;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700761 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) &&
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +0900768 sci->sc_nfreesegs == 0 &&
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700769 (!nilfs_doing_gc() || list_empty(&sci->sc_gc_inodes));
770}
771
772static int nilfs_segctor_confirm(struct nilfs_sc_info *sci)
773{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900774 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700775 int ret = 0;
776
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900777 if (nilfs_test_metadata_dirty(nilfs, sci->sc_root))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700778 set_bit(NILFS_SC_DIRTY, &sci->sc_flags);
779
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900780 spin_lock(&nilfs->ns_inode_lock);
781 if (list_empty(&nilfs->ns_dirty_files) && nilfs_segctor_clean(sci))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700782 ret++;
783
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900784 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700785 return ret;
786}
787
788static void nilfs_segctor_clear_metadata_dirty(struct nilfs_sc_info *sci)
789{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900790 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700791
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900792 nilfs_mdt_clear_dirty(sci->sc_root->ifile);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700793 nilfs_mdt_clear_dirty(nilfs->ns_cpfile);
794 nilfs_mdt_clear_dirty(nilfs->ns_sufile);
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900795 nilfs_mdt_clear_dirty(nilfs->ns_dat);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700796}
797
798static int nilfs_segctor_create_checkpoint(struct nilfs_sc_info *sci)
799{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900800 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700801 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 */
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900812 mark_buffer_dirty(bh_cp);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700813 nilfs_mdt_mark_dirty(nilfs->ns_cpfile);
814 nilfs_cpfile_put_checkpoint(
815 nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700816 } else
817 WARN_ON(err == -EINVAL || err == -ENOENT);
818
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700819 return err;
820}
821
822static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci)
823{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900824 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700825 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)) {
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700832 WARN_ON(err == -EINVAL || err == -ENOENT);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700833 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 =
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -0700838 cpu_to_le64(atomic64_read(&sci->sc_root->inodes_count));
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700839 raw_cp->cp_blocks_count =
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -0700840 cpu_to_le64(atomic64_read(&sci->sc_root->blocks_count));
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700841 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);
Ryusuke Konishi458c5b02009-04-06 19:01:56 -0700845
Ryusuke Konishic96fa462009-04-06 19:01:57 -0700846 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
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900851 nilfs_write_inode_common(sci->sc_root->ifile,
852 &raw_cp->cp_ifile_inode, 1);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700853 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
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900877static void nilfs_segctor_fill_in_file_bmap(struct nilfs_sc_info *sci)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700878{
879 struct nilfs_inode_info *ii;
880
881 list_for_each_entry(ii, &sci->sc_dirty_files, i_dirty) {
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900882 nilfs_fill_in_file_bmap(sci->sc_root->ifile, ii);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700883 set_bit(NILFS_I_COLLECTED, &ii->i_state);
884 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700885}
886
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700887static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info *sci,
888 struct the_nilfs *nilfs)
889{
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +0900890 struct buffer_head *bh_sr;
891 struct nilfs_super_root *raw_sr;
Ryusuke Konishi56eb5532011-04-30 18:56:12 +0900892 unsigned isz, srsz;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700893
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +0900894 bh_sr = NILFS_LAST_SEGBUF(&sci->sc_segbufs)->sb_super_root;
895 raw_sr = (struct nilfs_super_root *)bh_sr->b_data;
Ryusuke Konishi56eb5532011-04-30 18:56:12 +0900896 isz = nilfs->ns_inode_size;
897 srsz = NILFS_SR_BYTES(isz);
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +0900898
Ryusuke Konishi56eb5532011-04-30 18:56:12 +0900899 raw_sr->sr_bytes = cpu_to_le16(srsz);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700900 raw_sr->sr_nongc_ctime
901 = cpu_to_le64(nilfs_doing_gc() ?
902 nilfs->ns_nongc_ctime : sci->sc_seg_ctime);
903 raw_sr->sr_flags = 0;
904
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900905 nilfs_write_inode_common(nilfs->ns_dat, (void *)raw_sr +
Ryusuke Konishi3961f0e2009-11-13 01:55:02 +0900906 NILFS_SR_DAT_OFFSET(isz), 1);
907 nilfs_write_inode_common(nilfs->ns_cpfile, (void *)raw_sr +
908 NILFS_SR_CPFILE_OFFSET(isz), 1);
909 nilfs_write_inode_common(nilfs->ns_sufile, (void *)raw_sr +
910 NILFS_SR_SUFILE_OFFSET(isz), 1);
Ryusuke Konishi56eb5532011-04-30 18:56:12 +0900911 memset((void *)raw_sr + srsz, 0, nilfs->ns_blocksize - srsz);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700912}
913
914static void nilfs_redirty_inodes(struct list_head *head)
915{
916 struct nilfs_inode_info *ii;
917
918 list_for_each_entry(ii, head, i_dirty) {
919 if (test_bit(NILFS_I_COLLECTED, &ii->i_state))
920 clear_bit(NILFS_I_COLLECTED, &ii->i_state);
921 }
922}
923
924static void nilfs_drop_collected_inodes(struct list_head *head)
925{
926 struct nilfs_inode_info *ii;
927
928 list_for_each_entry(ii, head, i_dirty) {
929 if (!test_and_clear_bit(NILFS_I_COLLECTED, &ii->i_state))
930 continue;
931
932 clear_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
933 set_bit(NILFS_I_UPDATED, &ii->i_state);
934 }
935}
936
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700937static int nilfs_segctor_apply_buffers(struct nilfs_sc_info *sci,
938 struct inode *inode,
939 struct list_head *listp,
940 int (*collect)(struct nilfs_sc_info *,
941 struct buffer_head *,
942 struct inode *))
943{
944 struct buffer_head *bh, *n;
945 int err = 0;
946
947 if (collect) {
948 list_for_each_entry_safe(bh, n, listp, b_assoc_buffers) {
949 list_del_init(&bh->b_assoc_buffers);
950 err = collect(sci, bh, inode);
951 brelse(bh);
952 if (unlikely(err))
953 goto dispose_buffers;
954 }
955 return 0;
956 }
957
958 dispose_buffers:
959 while (!list_empty(listp)) {
Ryusuke Konishi0cc1283882011-05-05 12:56:51 +0900960 bh = list_first_entry(listp, struct buffer_head,
961 b_assoc_buffers);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700962 list_del_init(&bh->b_assoc_buffers);
963 brelse(bh);
964 }
965 return err;
966}
967
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700968static size_t nilfs_segctor_buffer_rest(struct nilfs_sc_info *sci)
969{
970 /* Remaining number of blocks within segment buffer */
971 return sci->sc_segbuf_nblocks -
972 (sci->sc_nblk_this_inc + sci->sc_curseg->sb_sum.nblocks);
973}
974
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700975static int nilfs_segctor_scan_file(struct nilfs_sc_info *sci,
976 struct inode *inode,
977 struct nilfs_sc_operations *sc_ops)
978{
979 LIST_HEAD(data_buffers);
980 LIST_HEAD(node_buffers);
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700981 int err;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700982
983 if (!(sci->sc_stage.flags & NILFS_CF_NODE)) {
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700984 size_t n, rest = nilfs_segctor_buffer_rest(sci);
985
986 n = nilfs_lookup_dirty_data_buffers(
987 inode, &data_buffers, rest + 1, 0, LLONG_MAX);
988 if (n > rest) {
989 err = nilfs_segctor_apply_buffers(
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700990 sci, inode, &data_buffers,
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700991 sc_ops->collect_data);
992 BUG_ON(!err); /* always receive -E2BIG or true error */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700993 goto break_or_fail;
994 }
995 }
996 nilfs_lookup_dirty_node_buffers(inode, &node_buffers);
997
998 if (!(sci->sc_stage.flags & NILFS_CF_NODE)) {
999 err = nilfs_segctor_apply_buffers(
1000 sci, inode, &data_buffers, sc_ops->collect_data);
1001 if (unlikely(err)) {
1002 /* dispose node list */
1003 nilfs_segctor_apply_buffers(
1004 sci, inode, &node_buffers, NULL);
1005 goto break_or_fail;
1006 }
1007 sci->sc_stage.flags |= NILFS_CF_NODE;
1008 }
1009 /* Collect node */
1010 err = nilfs_segctor_apply_buffers(
1011 sci, inode, &node_buffers, sc_ops->collect_node);
1012 if (unlikely(err))
1013 goto break_or_fail;
1014
1015 nilfs_bmap_lookup_dirty_buffers(NILFS_I(inode)->i_bmap, &node_buffers);
1016 err = nilfs_segctor_apply_buffers(
1017 sci, inode, &node_buffers, sc_ops->collect_bmap);
1018 if (unlikely(err))
1019 goto break_or_fail;
1020
1021 nilfs_segctor_end_finfo(sci, inode);
1022 sci->sc_stage.flags &= ~NILFS_CF_NODE;
1023
1024 break_or_fail:
1025 return err;
1026}
1027
1028static int nilfs_segctor_scan_file_dsync(struct nilfs_sc_info *sci,
1029 struct inode *inode)
1030{
1031 LIST_HEAD(data_buffers);
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07001032 size_t n, rest = nilfs_segctor_buffer_rest(sci);
1033 int err;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001034
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07001035 n = nilfs_lookup_dirty_data_buffers(inode, &data_buffers, rest + 1,
1036 sci->sc_dsync_start,
1037 sci->sc_dsync_end);
1038
1039 err = nilfs_segctor_apply_buffers(sci, inode, &data_buffers,
1040 nilfs_collect_file_data);
1041 if (!err) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001042 nilfs_segctor_end_finfo(sci, inode);
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07001043 BUG_ON(n > rest);
1044 /* always receive -E2BIG or true error if n > rest */
1045 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001046 return err;
1047}
1048
1049static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode)
1050{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001051 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001052 struct list_head *head;
1053 struct nilfs_inode_info *ii;
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +09001054 size_t ndone;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001055 int err = 0;
1056
1057 switch (sci->sc_stage.scnt) {
1058 case NILFS_ST_INIT:
1059 /* Pre-processes */
1060 sci->sc_stage.flags = 0;
1061
1062 if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) {
1063 sci->sc_nblk_inc = 0;
1064 sci->sc_curseg->sb_sum.flags = NILFS_SS_LOGBGN;
1065 if (mode == SC_LSEG_DSYNC) {
1066 sci->sc_stage.scnt = NILFS_ST_DSYNC;
1067 goto dsync_mode;
1068 }
1069 }
1070
1071 sci->sc_stage.dirty_file_ptr = NULL;
1072 sci->sc_stage.gc_inode_ptr = NULL;
1073 if (mode == SC_FLUSH_DAT) {
1074 sci->sc_stage.scnt = NILFS_ST_DAT;
1075 goto dat_stage;
1076 }
1077 sci->sc_stage.scnt++; /* Fall through */
1078 case NILFS_ST_GC:
1079 if (nilfs_doing_gc()) {
1080 head = &sci->sc_gc_inodes;
1081 ii = list_prepare_entry(sci->sc_stage.gc_inode_ptr,
1082 head, i_dirty);
1083 list_for_each_entry_continue(ii, head, i_dirty) {
1084 err = nilfs_segctor_scan_file(
1085 sci, &ii->vfs_inode,
1086 &nilfs_sc_file_ops);
1087 if (unlikely(err)) {
1088 sci->sc_stage.gc_inode_ptr = list_entry(
1089 ii->i_dirty.prev,
1090 struct nilfs_inode_info,
1091 i_dirty);
1092 goto break_or_fail;
1093 }
1094 set_bit(NILFS_I_COLLECTED, &ii->i_state);
1095 }
1096 sci->sc_stage.gc_inode_ptr = NULL;
1097 }
1098 sci->sc_stage.scnt++; /* Fall through */
1099 case NILFS_ST_FILE:
1100 head = &sci->sc_dirty_files;
1101 ii = list_prepare_entry(sci->sc_stage.dirty_file_ptr, head,
1102 i_dirty);
1103 list_for_each_entry_continue(ii, head, i_dirty) {
1104 clear_bit(NILFS_I_DIRTY, &ii->i_state);
1105
1106 err = nilfs_segctor_scan_file(sci, &ii->vfs_inode,
1107 &nilfs_sc_file_ops);
1108 if (unlikely(err)) {
1109 sci->sc_stage.dirty_file_ptr =
1110 list_entry(ii->i_dirty.prev,
1111 struct nilfs_inode_info,
1112 i_dirty);
1113 goto break_or_fail;
1114 }
1115 /* sci->sc_stage.dirty_file_ptr = NILFS_I(inode); */
1116 /* XXX: required ? */
1117 }
1118 sci->sc_stage.dirty_file_ptr = NULL;
1119 if (mode == SC_FLUSH_FILE) {
1120 sci->sc_stage.scnt = NILFS_ST_DONE;
1121 return 0;
1122 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001123 sci->sc_stage.scnt++;
1124 sci->sc_stage.flags |= NILFS_CF_IFILE_STARTED;
1125 /* Fall through */
1126 case NILFS_ST_IFILE:
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001127 err = nilfs_segctor_scan_file(sci, sci->sc_root->ifile,
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001128 &nilfs_sc_file_ops);
1129 if (unlikely(err))
1130 break;
1131 sci->sc_stage.scnt++;
1132 /* Creating a checkpoint */
1133 err = nilfs_segctor_create_checkpoint(sci);
1134 if (unlikely(err))
1135 break;
1136 /* Fall through */
1137 case NILFS_ST_CPFILE:
1138 err = nilfs_segctor_scan_file(sci, nilfs->ns_cpfile,
1139 &nilfs_sc_file_ops);
1140 if (unlikely(err))
1141 break;
1142 sci->sc_stage.scnt++; /* Fall through */
1143 case NILFS_ST_SUFILE:
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +09001144 err = nilfs_sufile_freev(nilfs->ns_sufile, sci->sc_freesegs,
1145 sci->sc_nfreesegs, &ndone);
1146 if (unlikely(err)) {
1147 nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1148 sci->sc_freesegs, ndone,
1149 NULL);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001150 break;
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +09001151 }
1152 sci->sc_stage.flags |= NILFS_CF_SUFREED;
1153
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001154 err = nilfs_segctor_scan_file(sci, nilfs->ns_sufile,
1155 &nilfs_sc_file_ops);
1156 if (unlikely(err))
1157 break;
1158 sci->sc_stage.scnt++; /* Fall through */
1159 case NILFS_ST_DAT:
1160 dat_stage:
Ryusuke Konishi365e2152010-12-27 00:07:30 +09001161 err = nilfs_segctor_scan_file(sci, nilfs->ns_dat,
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001162 &nilfs_sc_dat_ops);
1163 if (unlikely(err))
1164 break;
1165 if (mode == SC_FLUSH_DAT) {
1166 sci->sc_stage.scnt = NILFS_ST_DONE;
1167 return 0;
1168 }
1169 sci->sc_stage.scnt++; /* Fall through */
1170 case NILFS_ST_SR:
1171 if (mode == SC_LSEG_SR) {
1172 /* Appending a super root */
1173 err = nilfs_segctor_add_super_root(sci);
1174 if (unlikely(err))
1175 break;
1176 }
1177 /* End of a logical segment */
1178 sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND;
1179 sci->sc_stage.scnt = NILFS_ST_DONE;
1180 return 0;
1181 case NILFS_ST_DSYNC:
1182 dsync_mode:
1183 sci->sc_curseg->sb_sum.flags |= NILFS_SS_SYNDT;
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07001184 ii = sci->sc_dsync_inode;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001185 if (!test_bit(NILFS_I_BUSY, &ii->i_state))
1186 break;
1187
1188 err = nilfs_segctor_scan_file_dsync(sci, &ii->vfs_inode);
1189 if (unlikely(err))
1190 break;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001191 sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND;
1192 sci->sc_stage.scnt = NILFS_ST_DONE;
1193 return 0;
1194 case NILFS_ST_DONE:
1195 return 0;
1196 default:
1197 BUG();
1198 }
1199
1200 break_or_fail:
1201 return err;
1202}
1203
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001204/**
1205 * nilfs_segctor_begin_construction - setup segment buffer to make a new log
1206 * @sci: nilfs_sc_info
1207 * @nilfs: nilfs object
1208 */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001209static int nilfs_segctor_begin_construction(struct nilfs_sc_info *sci,
1210 struct the_nilfs *nilfs)
1211{
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001212 struct nilfs_segment_buffer *segbuf, *prev;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001213 __u64 nextnum;
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001214 int err, alloc = 0;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001215
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001216 segbuf = nilfs_segbuf_new(sci->sc_super);
1217 if (unlikely(!segbuf))
1218 return -ENOMEM;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001219
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001220 if (list_empty(&sci->sc_write_logs)) {
1221 nilfs_segbuf_map(segbuf, nilfs->ns_segnum,
1222 nilfs->ns_pseg_offset, nilfs);
1223 if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
1224 nilfs_shift_to_next_segment(nilfs);
1225 nilfs_segbuf_map(segbuf, nilfs->ns_segnum, 0, nilfs);
1226 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001227
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001228 segbuf->sb_sum.seg_seq = nilfs->ns_seg_seq;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001229 nextnum = nilfs->ns_nextnum;
1230
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001231 if (nilfs->ns_segnum == nilfs->ns_nextnum)
1232 /* Start from the head of a new full segment */
1233 alloc++;
1234 } else {
1235 /* Continue logs */
1236 prev = NILFS_LAST_SEGBUF(&sci->sc_write_logs);
1237 nilfs_segbuf_map_cont(segbuf, prev);
1238 segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq;
1239 nextnum = prev->sb_nextnum;
1240
1241 if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
1242 nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs);
1243 segbuf->sb_sum.seg_seq++;
1244 alloc++;
1245 }
1246 }
1247
1248 err = nilfs_sufile_mark_dirty(nilfs->ns_sufile, segbuf->sb_segnum);
1249 if (err)
1250 goto failed;
1251
1252 if (alloc) {
1253 err = nilfs_sufile_alloc(nilfs->ns_sufile, &nextnum);
1254 if (err)
1255 goto failed;
1256 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001257 nilfs_segbuf_set_next_segnum(segbuf, nextnum, nilfs);
1258
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001259 BUG_ON(!list_empty(&sci->sc_segbufs));
1260 list_add_tail(&segbuf->sb_list, &sci->sc_segbufs);
1261 sci->sc_segbuf_nblocks = segbuf->sb_rest_blocks;
Ryusuke Konishicece5522009-04-06 19:01:58 -07001262 return 0;
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001263
1264 failed:
1265 nilfs_segbuf_free(segbuf);
1266 return err;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001267}
1268
1269static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci,
1270 struct the_nilfs *nilfs, int nadd)
1271{
Ryusuke Konishie29df392009-11-29 16:51:16 +09001272 struct nilfs_segment_buffer *segbuf, *prev;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001273 struct inode *sufile = nilfs->ns_sufile;
1274 __u64 nextnextnum;
1275 LIST_HEAD(list);
1276 int err, ret, i;
1277
1278 prev = NILFS_LAST_SEGBUF(&sci->sc_segbufs);
1279 /*
1280 * Since the segment specified with nextnum might be allocated during
1281 * the previous construction, the buffer including its segusage may
1282 * not be dirty. The following call ensures that the buffer is dirty
1283 * and will pin the buffer on memory until the sufile is written.
1284 */
Ryusuke Konishi61a189e2009-11-18 17:25:12 +09001285 err = nilfs_sufile_mark_dirty(sufile, prev->sb_nextnum);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001286 if (unlikely(err))
1287 return err;
1288
1289 for (i = 0; i < nadd; i++) {
1290 /* extend segment info */
1291 err = -ENOMEM;
1292 segbuf = nilfs_segbuf_new(sci->sc_super);
1293 if (unlikely(!segbuf))
1294 goto failed;
1295
1296 /* map this buffer to region of segment on-disk */
Ryusuke Konishicece5522009-04-06 19:01:58 -07001297 nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001298 sci->sc_segbuf_nblocks += segbuf->sb_rest_blocks;
1299
1300 /* allocate the next next full segment */
1301 err = nilfs_sufile_alloc(sufile, &nextnextnum);
1302 if (unlikely(err))
1303 goto failed_segbuf;
1304
1305 segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq + 1;
1306 nilfs_segbuf_set_next_segnum(segbuf, nextnextnum, nilfs);
1307
1308 list_add_tail(&segbuf->sb_list, &list);
1309 prev = segbuf;
1310 }
Ryusuke Konishi0935db72009-11-29 02:39:11 +09001311 list_splice_tail(&list, &sci->sc_segbufs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001312 return 0;
1313
1314 failed_segbuf:
1315 nilfs_segbuf_free(segbuf);
1316 failed:
Ryusuke Konishie29df392009-11-29 16:51:16 +09001317 list_for_each_entry(segbuf, &list, sb_list) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001318 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -07001319 WARN_ON(ret); /* never fails */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001320 }
Ryusuke Konishie29df392009-11-29 16:51:16 +09001321 nilfs_destroy_logs(&list);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001322 return err;
1323}
1324
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001325static void nilfs_free_incomplete_logs(struct list_head *logs,
1326 struct the_nilfs *nilfs)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001327{
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001328 struct nilfs_segment_buffer *segbuf, *prev;
1329 struct inode *sufile = nilfs->ns_sufile;
Ryusuke Konishi9284ad22009-11-25 01:04:21 +09001330 int ret;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001331
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001332 segbuf = NILFS_FIRST_SEGBUF(logs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001333 if (nilfs->ns_nextnum != segbuf->sb_nextnum) {
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001334 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -07001335 WARN_ON(ret); /* never fails */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001336 }
Ryusuke Konishi9284ad22009-11-25 01:04:21 +09001337 if (atomic_read(&segbuf->sb_err)) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001338 /* Case 1: The first segment failed */
1339 if (segbuf->sb_pseg_start != segbuf->sb_fseg_start)
1340 /* Case 1a: Partial segment appended into an existing
1341 segment */
1342 nilfs_terminate_segment(nilfs, segbuf->sb_fseg_start,
1343 segbuf->sb_fseg_end);
1344 else /* Case 1b: New full segment */
1345 set_nilfs_discontinued(nilfs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001346 }
1347
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001348 prev = segbuf;
1349 list_for_each_entry_continue(segbuf, logs, sb_list) {
1350 if (prev->sb_nextnum != segbuf->sb_nextnum) {
1351 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1352 WARN_ON(ret); /* never fails */
1353 }
Ryusuke Konishi9284ad22009-11-25 01:04:21 +09001354 if (atomic_read(&segbuf->sb_err) &&
1355 segbuf->sb_segnum != nilfs->ns_nextnum)
1356 /* Case 2: extended segment (!= next) failed */
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001357 nilfs_sufile_set_error(sufile, segbuf->sb_segnum);
1358 prev = segbuf;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001359 }
1360}
1361
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001362static void nilfs_segctor_update_segusage(struct nilfs_sc_info *sci,
1363 struct inode *sufile)
1364{
1365 struct nilfs_segment_buffer *segbuf;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001366 unsigned long live_blocks;
1367 int ret;
1368
1369 list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001370 live_blocks = segbuf->sb_sum.nblocks +
1371 (segbuf->sb_pseg_start - segbuf->sb_fseg_start);
Ryusuke Konishi071ec542009-11-18 18:23:34 +09001372 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1373 live_blocks,
1374 sci->sc_seg_ctime);
1375 WARN_ON(ret); /* always succeed because the segusage is dirty */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001376 }
1377}
1378
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001379static void nilfs_cancel_segusage(struct list_head *logs, struct inode *sufile)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001380{
1381 struct nilfs_segment_buffer *segbuf;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001382 int ret;
1383
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001384 segbuf = NILFS_FIRST_SEGBUF(logs);
Ryusuke Konishi071ec542009-11-18 18:23:34 +09001385 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1386 segbuf->sb_pseg_start -
1387 segbuf->sb_fseg_start, 0);
1388 WARN_ON(ret); /* always succeed because the segusage is dirty */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001389
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001390 list_for_each_entry_continue(segbuf, logs, sb_list) {
Ryusuke Konishi071ec542009-11-18 18:23:34 +09001391 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1392 0, 0);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -07001393 WARN_ON(ret); /* always succeed */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001394 }
1395}
1396
1397static void nilfs_segctor_truncate_segments(struct nilfs_sc_info *sci,
1398 struct nilfs_segment_buffer *last,
1399 struct inode *sufile)
1400{
Ryusuke Konishie29df392009-11-29 16:51:16 +09001401 struct nilfs_segment_buffer *segbuf = last;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001402 int ret;
1403
Ryusuke Konishie29df392009-11-29 16:51:16 +09001404 list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001405 sci->sc_segbuf_nblocks -= segbuf->sb_rest_blocks;
1406 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -07001407 WARN_ON(ret);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001408 }
Ryusuke Konishie29df392009-11-29 16:51:16 +09001409 nilfs_truncate_logs(&sci->sc_segbufs, last);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001410}
1411
1412
1413static int nilfs_segctor_collect(struct nilfs_sc_info *sci,
1414 struct the_nilfs *nilfs, int mode)
1415{
1416 struct nilfs_cstage prev_stage = sci->sc_stage;
1417 int err, nadd = 1;
1418
1419 /* Collection retry loop */
1420 for (;;) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001421 sci->sc_nblk_this_inc = 0;
1422 sci->sc_curseg = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
1423
1424 err = nilfs_segctor_reset_segment_buffer(sci);
1425 if (unlikely(err))
1426 goto failed;
1427
1428 err = nilfs_segctor_collect_blocks(sci, mode);
1429 sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
1430 if (!err)
1431 break;
1432
1433 if (unlikely(err != -E2BIG))
1434 goto failed;
1435
1436 /* The current segment is filled up */
1437 if (mode != SC_LSEG_SR || sci->sc_stage.scnt < NILFS_ST_CPFILE)
1438 break;
1439
Ryusuke Konishi2d8428a2010-03-22 14:01:24 +09001440 nilfs_clear_logs(&sci->sc_segbufs);
1441
1442 err = nilfs_segctor_extend_segments(sci, nilfs, nadd);
1443 if (unlikely(err))
1444 return err;
1445
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +09001446 if (sci->sc_stage.flags & NILFS_CF_SUFREED) {
1447 err = nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1448 sci->sc_freesegs,
1449 sci->sc_nfreesegs,
1450 NULL);
1451 WARN_ON(err); /* do not happen */
1452 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001453 nadd = min_t(int, nadd << 1, SC_MAX_SEGDELTA);
1454 sci->sc_stage = prev_stage;
1455 }
1456 nilfs_segctor_truncate_segments(sci, sci->sc_curseg, nilfs->ns_sufile);
1457 return 0;
1458
1459 failed:
1460 return err;
1461}
1462
1463static void nilfs_list_replace_buffer(struct buffer_head *old_bh,
1464 struct buffer_head *new_bh)
1465{
1466 BUG_ON(!list_empty(&new_bh->b_assoc_buffers));
1467
1468 list_replace_init(&old_bh->b_assoc_buffers, &new_bh->b_assoc_buffers);
1469 /* The caller must release old_bh */
1470}
1471
1472static int
1473nilfs_segctor_update_payload_blocknr(struct nilfs_sc_info *sci,
1474 struct nilfs_segment_buffer *segbuf,
1475 int mode)
1476{
1477 struct inode *inode = NULL;
1478 sector_t blocknr;
1479 unsigned long nfinfo = segbuf->sb_sum.nfinfo;
1480 unsigned long nblocks = 0, ndatablk = 0;
1481 struct nilfs_sc_operations *sc_op = NULL;
1482 struct nilfs_segsum_pointer ssp;
1483 struct nilfs_finfo *finfo = NULL;
1484 union nilfs_binfo binfo;
1485 struct buffer_head *bh, *bh_org;
1486 ino_t ino = 0;
1487 int err = 0;
1488
1489 if (!nfinfo)
1490 goto out;
1491
1492 blocknr = segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk;
1493 ssp.bh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers);
1494 ssp.offset = sizeof(struct nilfs_segment_summary);
1495
1496 list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +09001497 if (bh == segbuf->sb_super_root)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001498 break;
1499 if (!finfo) {
1500 finfo = nilfs_segctor_map_segsum_entry(
1501 sci, &ssp, sizeof(*finfo));
1502 ino = le64_to_cpu(finfo->fi_ino);
1503 nblocks = le32_to_cpu(finfo->fi_nblocks);
1504 ndatablk = le32_to_cpu(finfo->fi_ndatablk);
1505
Ryusuke Konishiaa405b12011-05-05 12:56:51 +09001506 inode = bh->b_page->mapping->host;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001507
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:
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001542 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
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001559static void nilfs_begin_page_io(struct page *page)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001560{
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. */
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001564 return;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001565
1566 lock_page(page);
1567 clear_page_dirty_for_io(page);
1568 set_page_writeback(page);
1569 unlock_page(page);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001570}
1571
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001572static void nilfs_segctor_prepare_write(struct nilfs_sc_info *sci)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001573{
1574 struct nilfs_segment_buffer *segbuf;
1575 struct page *bd_page = NULL, *fs_page = NULL;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001576
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001577 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) {
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +09001595 if (bh == segbuf->sb_super_root) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001596 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) {
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001606 nilfs_begin_page_io(fs_page);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001607 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 }
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001617 nilfs_begin_page_io(fs_page);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001618}
1619
1620static int nilfs_segctor_write(struct nilfs_sc_info *sci,
Ryusuke Konishi9c965ba2009-11-29 01:17:31 +09001621 struct the_nilfs *nilfs)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001622{
Ryusuke Konishid1c6b722009-12-17 00:55:40 +09001623 int ret;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001624
Ryusuke Konishid1c6b722009-12-17 00:55:40 +09001625 ret = nilfs_write_logs(&sci->sc_segbufs, nilfs);
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001626 list_splice_tail_init(&sci->sc_segbufs, &sci->sc_write_logs);
1627 return ret;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001628}
1629
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001630static void nilfs_end_page_io(struct page *page, int err)
1631{
1632 if (!page)
1633 return;
1634
Ryusuke Konishia9777842009-07-28 17:55:29 +09001635 if (buffer_nilfs_node(page_buffers(page)) && !PageWriteback(page)) {
Ryusuke Konishi8227b292009-06-18 23:52:23 +09001636 /*
1637 * For b-tree node pages, this function may be called twice
1638 * or more because they might be split in a segment.
1639 */
Ryusuke Konishia9777842009-07-28 17:55:29 +09001640 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 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001653 return;
Ryusuke Konishia9777842009-07-28 17:55:29 +09001654 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001655
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001656 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);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001663 }
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001664
1665 end_page_writeback(page);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001666}
1667
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001668static void nilfs_abort_logs(struct list_head *logs, int err)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001669{
1670 struct nilfs_segment_buffer *segbuf;
1671 struct page *bd_page = NULL, *fs_page = NULL;
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001672 struct buffer_head *bh;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001673
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001674 if (list_empty(logs))
1675 return;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001676
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001677 list_for_each_entry(segbuf, logs, sb_list) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001678 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) {
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +09001689 if (bh == segbuf->sb_super_root) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001690 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);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001698 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);
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001706}
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);
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001716 nilfs_abort_logs(&logs, ret ? : err);
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001717
1718 list_splice_tail_init(&sci->sc_segbufs, &logs);
1719 nilfs_cancel_segusage(&logs, nilfs->ns_sufile);
1720 nilfs_free_incomplete_logs(&logs, nilfs);
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001721
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);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001731}
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;
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001748 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +09001749 int update_sr = false;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001750
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001751 list_for_each_entry(segbuf, &sci->sc_write_logs, sb_list) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001752 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);
Ryusuke Konishi27e6c7a2010-12-26 16:28:28 +09001779 clear_buffer_delay(bh);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001780 clear_buffer_nilfs_volatile(bh);
Ryusuke Konishib1f6a4f2010-08-31 11:40:34 +09001781 clear_buffer_nilfs_redirected(bh);
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +09001782 if (bh == segbuf->sb_super_root) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001783 if (bh->b_page != bd_page) {
1784 end_page_writeback(bd_page);
1785 bd_page = bh->b_page;
1786 }
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +09001787 update_sr = true;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001788 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
Ryusuke Konishi47620772010-05-23 21:48:36 +09001796 if (!nilfs_segbuf_simplex(segbuf)) {
1797 if (segbuf->sb_sum.flags & NILFS_SS_LOGBGN) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001798 set_bit(NILFS_SC_UNCLOSED, &sci->sc_flags);
1799 sci->sc_lseg_stime = jiffies;
1800 }
Ryusuke Konishi47620772010-05-23 21:48:36 +09001801 if (segbuf->sb_sum.flags & NILFS_SS_LOGEND)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001802 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
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001814 nilfs_drop_collected_inodes(&sci->sc_dirty_files);
1815
Ryusuke Konishic1c1d70922010-08-29 12:44:56 +09001816 if (nilfs_doing_gc())
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001817 nilfs_drop_collected_inodes(&sci->sc_gc_inodes);
Ryusuke Konishic1c1d70922010-08-29 12:44:56 +09001818 else
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001819 nilfs->ns_nongc_ctime = sci->sc_seg_ctime;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001820
1821 sci->sc_nblk_inc += sci->sc_nblk_this_inc;
1822
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001823 segbuf = NILFS_LAST_SEGBUF(&sci->sc_write_logs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001824 nilfs_set_next_segment(nilfs, segbuf);
1825
1826 if (update_sr) {
1827 nilfs_set_last_segment(nilfs, segbuf->sb_pseg_start,
Ryusuke Konishie339ad32009-04-06 19:01:59 -07001828 segbuf->sb_sum.seg_seq, nilfs->ns_cno++);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001829
Ryusuke Konishic96fa462009-04-06 19:01:57 -07001830 clear_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001831 clear_bit(NILFS_SC_DIRTY, &sci->sc_flags);
1832 set_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags);
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001833 nilfs_segctor_clear_metadata_dirty(sci);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001834 } else
1835 clear_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags);
1836}
1837
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001838static 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
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001850static int nilfs_segctor_collect_dirty_files(struct nilfs_sc_info *sci,
1851 struct the_nilfs *nilfs)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001852{
1853 struct nilfs_inode_info *ii, *n;
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001854 struct inode *ifile = sci->sc_root->ifile;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001855
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001856 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001857 retry:
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001858 list_for_each_entry_safe(ii, n, &nilfs->ns_dirty_files, i_dirty) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001859 if (!ii->i_bh) {
1860 struct buffer_head *ibh;
1861 int err;
1862
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001863 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001864 err = nilfs_ifile_get_inode_block(
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001865 ifile, ii->vfs_inode.i_ino, &ibh);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001866 if (unlikely(err)) {
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001867 nilfs_warning(sci->sc_super, __func__,
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001868 "failed to get inode block.\n");
1869 return err;
1870 }
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +09001871 mark_buffer_dirty(ibh);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001872 nilfs_mdt_mark_dirty(ifile);
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001873 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001874 if (likely(!ii->i_bh))
1875 ii->i_bh = ibh;
1876 else
1877 brelse(ibh);
1878 goto retry;
1879 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001880
1881 clear_bit(NILFS_I_QUEUED, &ii->i_state);
1882 set_bit(NILFS_I_BUSY, &ii->i_state);
Nicolas Kaisereaae0f32011-03-19 16:45:30 +01001883 list_move_tail(&ii->i_dirty, &sci->sc_dirty_files);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001884 }
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001885 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001886
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001887 return 0;
1888}
1889
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001890static void nilfs_segctor_drop_written_files(struct nilfs_sc_info *sci,
1891 struct the_nilfs *nilfs)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001892{
1893 struct nilfs_transaction_info *ti = current->journal_info;
1894 struct nilfs_inode_info *ii, *n;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001895
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001896 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001897 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) ||
Ryusuke Konishi6c43f412010-08-20 20:10:38 +09001899 test_bit(NILFS_I_DIRTY, &ii->i_state))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001900 continue;
Ryusuke Konishi6c43f412010-08-20 20:10:38 +09001901
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001902 clear_bit(NILFS_I_BUSY, &ii->i_state);
1903 brelse(ii->i_bh);
1904 ii->i_bh = NULL;
Nicolas Kaisereaae0f32011-03-19 16:45:30 +01001905 list_move_tail(&ii->i_dirty, &ti->ti_garbage);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001906 }
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001907 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001908}
1909
1910/*
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001911 * Main procedure of segment constructor
1912 */
1913static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
1914{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001915 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +09001916 int err;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001917
1918 sci->sc_stage.scnt = NILFS_ST_INIT;
Ryusuke Konishi6c43f412010-08-20 20:10:38 +09001919 sci->sc_cno = nilfs->ns_cno;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001920
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001921 err = nilfs_segctor_collect_dirty_files(sci, nilfs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001922 if (unlikely(err))
1923 goto out;
1924
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001925 if (nilfs_test_metadata_dirty(nilfs, sci->sc_root))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001926 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
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001945 /* Avoid empty segment */
1946 if (sci->sc_stage.scnt == NILFS_ST_DONE &&
Ryusuke Konishi47620772010-05-23 21:48:36 +09001947 nilfs_segbuf_empty(sci->sc_curseg)) {
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001948 nilfs_segctor_abort_construction(sci, nilfs, 1);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001949 goto out;
1950 }
1951
1952 err = nilfs_segctor_assign(sci, mode);
1953 if (unlikely(err))
1954 goto failed;
1955
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001956 if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001957 nilfs_segctor_fill_in_file_bmap(sci);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001958
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +09001959 if (mode == SC_LSEG_SR &&
1960 sci->sc_stage.scnt >= NILFS_ST_CPFILE) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001961 err = nilfs_segctor_fill_in_checkpoint(sci);
1962 if (unlikely(err))
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001963 goto failed_to_write;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001964
1965 nilfs_segctor_fill_in_super_root(sci, nilfs);
1966 }
1967 nilfs_segctor_update_segusage(sci, nilfs->ns_sufile);
1968
1969 /* Write partial segments */
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001970 nilfs_segctor_prepare_write(sci);
Ryusuke Konishiaaed1d52010-03-23 01:50:38 +09001971
1972 nilfs_add_checksums_on_logs(&sci->sc_segbufs,
1973 nilfs->ns_crc_seed);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001974
Ryusuke Konishi9c965ba2009-11-29 01:17:31 +09001975 err = nilfs_segctor_write(sci, nilfs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001976 if (unlikely(err))
1977 goto failed_to_write;
1978
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001979 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 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001992 } while (sci->sc_stage.scnt != NILFS_ST_DONE);
1993
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001994 out:
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001995 nilfs_segctor_drop_written_files(sci, nilfs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001996 return err;
1997
1998 failed_to_write:
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001999 if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
2000 nilfs_redirty_inodes(&sci->sc_dirty_files);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002001
2002 failed:
2003 if (nilfs_doing_gc())
2004 nilfs_redirty_inodes(&sci->sc_gc_inodes);
Ryusuke Konishia694291a2009-11-29 23:03:04 +09002005 nilfs_segctor_abort_construction(sci, nilfs, err);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002006 goto out;
2007}
2008
2009/**
Ryusuke Konishi9ccf56c2010-03-14 03:01:03 +09002010 * nilfs_segctor_start_timer - set timer of background write
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002011 * @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);
Li Hongfdce8952010-04-10 23:25:39 +08002020 if (!(sci->sc_state & NILFS_SEGCTOR_COMMIT)) {
2021 sci->sc_timer.expires = jiffies + sci->sc_interval;
2022 add_timer(&sci->sc_timer);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002023 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{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002048 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002049 struct nilfs_sc_info *sci = nilfs->ns_writer;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002050
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
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002057struct 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{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002138 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002139 struct nilfs_sc_info *sci = nilfs->ns_writer;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002140 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
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07002156 * @inode: inode whose data blocks should be written out
2157 * @start: start byte offset
2158 * @end: end byte offset (inclusive)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002159 *
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 */
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07002173int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode,
2174 loff_t start, loff_t end)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002175{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002176 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002177 struct nilfs_sc_info *sci = nilfs->ns_writer;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002178 struct nilfs_inode_info *ii;
2179 struct nilfs_transaction_info ti;
2180 int err = 0;
2181
2182 if (!sci)
2183 return -EROFS;
2184
Ryusuke Konishif7545142011-03-09 11:05:08 +09002185 nilfs_transaction_lock(sb, &ti, 0);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002186
2187 ii = NILFS_I(inode);
2188 if (test_bit(NILFS_I_INODE_DIRTY, &ii->i_state) ||
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09002189 nilfs_test_opt(nilfs, STRICT_ORDER) ||
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002190 test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) ||
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09002191 nilfs_discontinued(nilfs)) {
Ryusuke Konishif7545142011-03-09 11:05:08 +09002192 nilfs_transaction_unlock(sb);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002193 err = nilfs_segctor_sync(sci);
2194 return err;
2195 }
2196
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002197 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002198 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
2199 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002200 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishif7545142011-03-09 11:05:08 +09002201 nilfs_transaction_unlock(sb);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002202 return 0;
2203 }
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002204 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07002205 sci->sc_dsync_inode = ii;
2206 sci->sc_dsync_start = start;
2207 sci->sc_dsync_end = end;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002208
2209 err = nilfs_segctor_do_construct(sci, SC_LSEG_DSYNC);
2210
Ryusuke Konishif7545142011-03-09 11:05:08 +09002211 nilfs_transaction_unlock(sb);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002212 return err;
2213}
2214
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002215#define FLUSH_FILE_BIT (0x1) /* data file only */
2216#define FLUSH_DAT_BIT (1 << NILFS_DAT_INO) /* DAT only */
2217
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002218/**
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)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002223{
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002224 spin_lock(&sci->sc_state_lock);
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002225 sci->sc_seq_accepted = sci->sc_seq_request;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002226 spin_unlock(&sci->sc_state_lock);
Li Hongfdce8952010-04-10 23:25:39 +08002227 del_timer_sync(&sci->sc_timer);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002228}
2229
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002230/**
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)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002237{
2238 /* Clear requests (even when the construction failed) */
2239 spin_lock(&sci->sc_state_lock);
2240
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002241 if (mode == SC_LSEG_SR) {
Ryusuke Konishiaeda7f62009-11-02 15:08:13 +09002242 sci->sc_state &= ~NILFS_SEGCTOR_COMMIT;
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002243 sci->sc_seq_done = sci->sc_seq_accepted;
2244 nilfs_segctor_wakeup(sci, err);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002245 sci->sc_flush_request = 0;
Ryusuke Konishiaeda7f62009-11-02 15:08:13 +09002246 } else {
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002247 if (mode == SC_FLUSH_FILE)
Ryusuke Konishiaeda7f62009-11-02 15:08:13 +09002248 sci->sc_flush_request &= ~FLUSH_FILE_BIT;
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002249 else if (mode == SC_FLUSH_DAT)
Ryusuke Konishiaeda7f62009-11-02 15:08:13 +09002250 sci->sc_flush_request &= ~FLUSH_DAT_BIT;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002251
Ryusuke Konishiaeda7f62009-11-02 15:08:13 +09002252 /* re-enable timer if checkpoint creation was not done */
Li Hongfdce8952010-04-10 23:25:39 +08002253 if ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
2254 time_before(jiffies, sci->sc_timer.expires))
2255 add_timer(&sci->sc_timer);
Ryusuke Konishiaeda7f62009-11-02 15:08:13 +09002256 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002257 spin_unlock(&sci->sc_state_lock);
2258}
2259
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002260/**
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)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002266{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002267 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +09002268 struct nilfs_super_block **sbp;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002269 int err = 0;
2270
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002271 nilfs_segctor_accept(sci);
2272
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002273 if (nilfs_discontinued(nilfs))
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002274 mode = SC_LSEG_SR;
2275 if (!nilfs_segctor_confirm(sci))
2276 err = nilfs_segctor_do_construct(sci, mode);
2277
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002278 if (likely(!err)) {
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002279 if (mode != SC_FLUSH_DAT)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002280 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);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +09002284 err = -EIO;
Ryusuke Konishif7545142011-03-09 11:05:08 +09002285 sbp = nilfs_prepare_super(sci->sc_super,
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +09002286 nilfs_sb_will_flip(nilfs));
2287 if (likely(sbp)) {
2288 nilfs_set_log_cursor(sbp[0], nilfs);
Ryusuke Konishif7545142011-03-09 11:05:08 +09002289 err = nilfs_commit_super(sci->sc_super,
2290 NILFS_SB_COMMIT);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +09002291 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002292 up_write(&nilfs->ns_sem);
2293 }
2294 }
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002295
2296 nilfs_segctor_notify(sci, mode, err);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002297 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;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002314 list_del_init(&ii->i_dirty);
Ryusuke Konishifbb24a32012-06-20 12:52:57 -07002315 truncate_inode_pages(&ii->vfs_inode.i_data, 0);
2316 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
Ryusuke Konishi263d90c2010-08-20 19:06:11 +09002317 iput(&ii->vfs_inode);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002318 }
2319}
2320
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +09002321int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv,
2322 void **kbufs)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002323{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002324 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002325 struct nilfs_sc_info *sci = nilfs->ns_writer;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002326 struct nilfs_transaction_info ti;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002327 int err;
2328
2329 if (unlikely(!sci))
2330 return -EROFS;
2331
Ryusuke Konishif7545142011-03-09 11:05:08 +09002332 nilfs_transaction_lock(sb, &ti, 1);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002333
Ryusuke Konishic1c1d70922010-08-29 12:44:56 +09002334 err = nilfs_mdt_save_to_shadow_map(nilfs->ns_dat);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002335 if (unlikely(err))
2336 goto out_unlock;
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +09002337
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +09002338 err = nilfs_ioctl_prepare_clean_segments(nilfs, argv, kbufs);
Ryusuke Konishic1c1d70922010-08-29 12:44:56 +09002339 if (unlikely(err)) {
2340 nilfs_mdt_restore_from_shadow_map(nilfs->ns_dat);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002341 goto out_unlock;
Ryusuke Konishic1c1d70922010-08-29 12:44:56 +09002342 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002343
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +09002344 sci->sc_freesegs = kbufs[4];
2345 sci->sc_nfreesegs = argv[4].v_nmembs;
Ryusuke Konishi0935db72009-11-29 02:39:11 +09002346 list_splice_tail_init(&nilfs->ns_gc_inodes, &sci->sc_gc_inodes);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002347
2348 for (;;) {
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002349 err = nilfs_segctor_construct(sci, SC_LSEG_SR);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002350 nilfs_remove_written_gcinodes(nilfs, &sci->sc_gc_inodes);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002351
2352 if (likely(!err))
2353 break;
2354
2355 nilfs_warning(sb, __func__,
2356 "segment construction failed. (err=%d)", err);
2357 set_current_state(TASK_INTERRUPTIBLE);
2358 schedule_timeout(sci->sc_interval);
2359 }
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09002360 if (nilfs_test_opt(nilfs, DISCARD)) {
Jiro SEKIBAe902ec92010-01-30 18:06:35 +09002361 int ret = nilfs_discard_segments(nilfs, sci->sc_freesegs,
2362 sci->sc_nfreesegs);
2363 if (ret) {
2364 printk(KERN_WARNING
2365 "NILFS warning: error %d on discard request, "
2366 "turning discards off for the device\n", ret);
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09002367 nilfs_clear_opt(nilfs, DISCARD);
Jiro SEKIBAe902ec92010-01-30 18:06:35 +09002368 }
2369 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002370
2371 out_unlock:
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +09002372 sci->sc_freesegs = NULL;
2373 sci->sc_nfreesegs = 0;
Ryusuke Konishic1c1d70922010-08-29 12:44:56 +09002374 nilfs_mdt_clear_shadow_map(nilfs->ns_dat);
Ryusuke Konishif7545142011-03-09 11:05:08 +09002375 nilfs_transaction_unlock(sb);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002376 return err;
2377}
2378
2379static void nilfs_segctor_thread_construct(struct nilfs_sc_info *sci, int mode)
2380{
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002381 struct nilfs_transaction_info ti;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002382
Ryusuke Konishif7545142011-03-09 11:05:08 +09002383 nilfs_transaction_lock(sci->sc_super, &ti, 0);
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002384 nilfs_segctor_construct(sci, mode);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002385
2386 /*
2387 * Unclosed segment should be retried. We do this using sc_timer.
2388 * Timeout of sc_timer will invoke complete construction which leads
2389 * to close the current logical segment.
2390 */
2391 if (test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags))
2392 nilfs_segctor_start_timer(sci);
2393
Ryusuke Konishif7545142011-03-09 11:05:08 +09002394 nilfs_transaction_unlock(sci->sc_super);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002395}
2396
2397static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *sci)
2398{
2399 int mode = 0;
2400 int err;
2401
2402 spin_lock(&sci->sc_state_lock);
2403 mode = (sci->sc_flush_request & FLUSH_DAT_BIT) ?
2404 SC_FLUSH_DAT : SC_FLUSH_FILE;
2405 spin_unlock(&sci->sc_state_lock);
2406
2407 if (mode) {
2408 err = nilfs_segctor_do_construct(sci, mode);
2409
2410 spin_lock(&sci->sc_state_lock);
2411 sci->sc_flush_request &= (mode == SC_FLUSH_FILE) ?
2412 ~FLUSH_FILE_BIT : ~FLUSH_DAT_BIT;
2413 spin_unlock(&sci->sc_state_lock);
2414 }
2415 clear_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags);
2416}
2417
2418static int nilfs_segctor_flush_mode(struct nilfs_sc_info *sci)
2419{
2420 if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) ||
2421 time_before(jiffies, sci->sc_lseg_stime + sci->sc_mjcp_freq)) {
2422 if (!(sci->sc_flush_request & ~FLUSH_FILE_BIT))
2423 return SC_FLUSH_FILE;
2424 else if (!(sci->sc_flush_request & ~FLUSH_DAT_BIT))
2425 return SC_FLUSH_DAT;
2426 }
2427 return SC_LSEG_SR;
2428}
2429
2430/**
2431 * nilfs_segctor_thread - main loop of the segment constructor thread.
2432 * @arg: pointer to a struct nilfs_sc_info.
2433 *
2434 * nilfs_segctor_thread() initializes a timer and serves as a daemon
2435 * to execute segment constructions.
2436 */
2437static int nilfs_segctor_thread(void *arg)
2438{
2439 struct nilfs_sc_info *sci = (struct nilfs_sc_info *)arg;
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002440 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002441 int timeout = 0;
2442
Li Hongfdce8952010-04-10 23:25:39 +08002443 sci->sc_timer.data = (unsigned long)current;
2444 sci->sc_timer.function = nilfs_construction_timeout;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002445
2446 /* start sync. */
2447 sci->sc_task = current;
2448 wake_up(&sci->sc_wait_task); /* for nilfs_segctor_start_thread() */
2449 printk(KERN_INFO
2450 "segctord starting. Construction interval = %lu seconds, "
2451 "CP frequency < %lu seconds\n",
2452 sci->sc_interval / HZ, sci->sc_mjcp_freq / HZ);
2453
2454 spin_lock(&sci->sc_state_lock);
2455 loop:
2456 for (;;) {
2457 int mode;
2458
2459 if (sci->sc_state & NILFS_SEGCTOR_QUIT)
2460 goto end_thread;
2461
2462 if (timeout || sci->sc_seq_request != sci->sc_seq_done)
2463 mode = SC_LSEG_SR;
2464 else if (!sci->sc_flush_request)
2465 break;
2466 else
2467 mode = nilfs_segctor_flush_mode(sci);
2468
2469 spin_unlock(&sci->sc_state_lock);
2470 nilfs_segctor_thread_construct(sci, mode);
2471 spin_lock(&sci->sc_state_lock);
2472 timeout = 0;
2473 }
2474
2475
2476 if (freezing(current)) {
2477 spin_unlock(&sci->sc_state_lock);
Tejun Heoa0acae02011-11-21 12:32:22 -08002478 try_to_freeze();
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002479 spin_lock(&sci->sc_state_lock);
2480 } else {
2481 DEFINE_WAIT(wait);
2482 int should_sleep = 1;
2483
2484 prepare_to_wait(&sci->sc_wait_daemon, &wait,
2485 TASK_INTERRUPTIBLE);
2486
2487 if (sci->sc_seq_request != sci->sc_seq_done)
2488 should_sleep = 0;
2489 else if (sci->sc_flush_request)
2490 should_sleep = 0;
2491 else if (sci->sc_state & NILFS_SEGCTOR_COMMIT)
2492 should_sleep = time_before(jiffies,
Li Hongfdce8952010-04-10 23:25:39 +08002493 sci->sc_timer.expires);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002494
2495 if (should_sleep) {
2496 spin_unlock(&sci->sc_state_lock);
2497 schedule();
2498 spin_lock(&sci->sc_state_lock);
2499 }
2500 finish_wait(&sci->sc_wait_daemon, &wait);
2501 timeout = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
Li Hongfdce8952010-04-10 23:25:39 +08002502 time_after_eq(jiffies, sci->sc_timer.expires));
Ryusuke Konishie605f0a2009-12-09 00:57:52 +09002503
2504 if (nilfs_sb_dirty(nilfs) && nilfs_sb_need_update(nilfs))
Jiro SEKIBA1dfa2712009-07-23 01:33:49 +09002505 set_nilfs_discontinued(nilfs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002506 }
2507 goto loop;
2508
2509 end_thread:
2510 spin_unlock(&sci->sc_state_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002511
2512 /* end sync. */
2513 sci->sc_task = NULL;
2514 wake_up(&sci->sc_wait_task); /* for nilfs_segctor_kill_thread() */
2515 return 0;
2516}
2517
2518static int nilfs_segctor_start_thread(struct nilfs_sc_info *sci)
2519{
2520 struct task_struct *t;
2521
2522 t = kthread_run(nilfs_segctor_thread, sci, "segctord");
2523 if (IS_ERR(t)) {
2524 int err = PTR_ERR(t);
2525
2526 printk(KERN_ERR "NILFS: error %d creating segctord thread\n",
2527 err);
2528 return err;
2529 }
2530 wait_event(sci->sc_wait_task, sci->sc_task != NULL);
2531 return 0;
2532}
2533
2534static void nilfs_segctor_kill_thread(struct nilfs_sc_info *sci)
Jiro SEKIBA6b81e142010-10-14 13:52:00 +09002535 __acquires(&sci->sc_state_lock)
2536 __releases(&sci->sc_state_lock)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002537{
2538 sci->sc_state |= NILFS_SEGCTOR_QUIT;
2539
2540 while (sci->sc_task) {
2541 wake_up(&sci->sc_wait_daemon);
2542 spin_unlock(&sci->sc_state_lock);
2543 wait_event(sci->sc_wait_task, sci->sc_task == NULL);
2544 spin_lock(&sci->sc_state_lock);
2545 }
2546}
2547
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002548/*
2549 * Setup & clean-up functions
2550 */
Ryusuke Konishif7545142011-03-09 11:05:08 +09002551static struct nilfs_sc_info *nilfs_segctor_new(struct super_block *sb,
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09002552 struct nilfs_root *root)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002553{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002554 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002555 struct nilfs_sc_info *sci;
2556
2557 sci = kzalloc(sizeof(*sci), GFP_KERNEL);
2558 if (!sci)
2559 return NULL;
2560
Ryusuke Konishif7545142011-03-09 11:05:08 +09002561 sci->sc_super = sb;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002562
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09002563 nilfs_get_root(root);
2564 sci->sc_root = root;
2565
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002566 init_waitqueue_head(&sci->sc_wait_request);
2567 init_waitqueue_head(&sci->sc_wait_daemon);
2568 init_waitqueue_head(&sci->sc_wait_task);
2569 spin_lock_init(&sci->sc_state_lock);
2570 INIT_LIST_HEAD(&sci->sc_dirty_files);
2571 INIT_LIST_HEAD(&sci->sc_segbufs);
Ryusuke Konishia694291a2009-11-29 23:03:04 +09002572 INIT_LIST_HEAD(&sci->sc_write_logs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002573 INIT_LIST_HEAD(&sci->sc_gc_inodes);
Li Hongfdce8952010-04-10 23:25:39 +08002574 init_timer(&sci->sc_timer);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002575
2576 sci->sc_interval = HZ * NILFS_SC_DEFAULT_TIMEOUT;
2577 sci->sc_mjcp_freq = HZ * NILFS_SC_DEFAULT_SR_FREQ;
2578 sci->sc_watermark = NILFS_SC_DEFAULT_WATERMARK;
2579
Ryusuke Konishi574e6c32011-03-09 11:05:07 +09002580 if (nilfs->ns_interval)
Ryusuke Konishi071d73c2011-06-10 00:33:06 +09002581 sci->sc_interval = HZ * nilfs->ns_interval;
Ryusuke Konishi574e6c32011-03-09 11:05:07 +09002582 if (nilfs->ns_watermark)
2583 sci->sc_watermark = nilfs->ns_watermark;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002584 return sci;
2585}
2586
2587static void nilfs_segctor_write_out(struct nilfs_sc_info *sci)
2588{
2589 int ret, retrycount = NILFS_SC_CLEANUP_RETRY;
2590
2591 /* The segctord thread was stopped and its timer was removed.
2592 But some tasks remain. */
2593 do {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002594 struct nilfs_transaction_info ti;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002595
Ryusuke Konishif7545142011-03-09 11:05:08 +09002596 nilfs_transaction_lock(sci->sc_super, &ti, 0);
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002597 ret = nilfs_segctor_construct(sci, SC_LSEG_SR);
Ryusuke Konishif7545142011-03-09 11:05:08 +09002598 nilfs_transaction_unlock(sci->sc_super);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002599
2600 } while (ret && retrycount-- > 0);
2601}
2602
2603/**
2604 * nilfs_segctor_destroy - destroy the segment constructor.
2605 * @sci: nilfs_sc_info
2606 *
2607 * nilfs_segctor_destroy() kills the segctord thread and frees
2608 * the nilfs_sc_info struct.
2609 * Caller must hold the segment semaphore.
2610 */
2611static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
2612{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002613 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002614 int flag;
2615
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002616 up_write(&nilfs->ns_segctor_sem);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002617
2618 spin_lock(&sci->sc_state_lock);
2619 nilfs_segctor_kill_thread(sci);
2620 flag = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) || sci->sc_flush_request
2621 || sci->sc_seq_request != sci->sc_seq_done);
2622 spin_unlock(&sci->sc_state_lock);
2623
Ryusuke Konishi3256a052010-01-31 12:39:50 +09002624 if (flag || !nilfs_segctor_confirm(sci))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002625 nilfs_segctor_write_out(sci);
2626
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002627 if (!list_empty(&sci->sc_dirty_files)) {
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002628 nilfs_warning(sci->sc_super, __func__,
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002629 "dirty file(s) after the final construction\n");
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002630 nilfs_dispose_list(nilfs, &sci->sc_dirty_files, 1);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002631 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002632
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -07002633 WARN_ON(!list_empty(&sci->sc_segbufs));
Ryusuke Konishia694291a2009-11-29 23:03:04 +09002634 WARN_ON(!list_empty(&sci->sc_write_logs));
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002635
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09002636 nilfs_put_root(sci->sc_root);
2637
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002638 down_write(&nilfs->ns_segctor_sem);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002639
Li Hongfdce8952010-04-10 23:25:39 +08002640 del_timer_sync(&sci->sc_timer);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002641 kfree(sci);
2642}
2643
2644/**
Ryusuke Konishif7545142011-03-09 11:05:08 +09002645 * nilfs_attach_log_writer - attach log writer
2646 * @sb: super block instance
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09002647 * @root: root object of the current filesystem tree
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002648 *
Ryusuke Konishif7545142011-03-09 11:05:08 +09002649 * This allocates a log writer object, initializes it, and starts the
2650 * log writer.
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002651 *
2652 * Return Value: On success, 0 is returned. On error, one of the following
2653 * negative error code is returned.
2654 *
2655 * %-ENOMEM - Insufficient memory available.
2656 */
Ryusuke Konishif7545142011-03-09 11:05:08 +09002657int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002658{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002659 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002660 int err;
2661
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002662 if (nilfs->ns_writer) {
Ryusuke Konishife5f1712010-01-31 19:46:40 +09002663 /*
2664 * This happens if the filesystem was remounted
2665 * read/write after nilfs_error degenerated it into a
2666 * read-only mount.
2667 */
Ryusuke Konishif7545142011-03-09 11:05:08 +09002668 nilfs_detach_log_writer(sb);
Ryusuke Konishife5f1712010-01-31 19:46:40 +09002669 }
2670
Ryusuke Konishif7545142011-03-09 11:05:08 +09002671 nilfs->ns_writer = nilfs_segctor_new(sb, root);
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002672 if (!nilfs->ns_writer)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002673 return -ENOMEM;
2674
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002675 err = nilfs_segctor_start_thread(nilfs->ns_writer);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002676 if (err) {
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002677 kfree(nilfs->ns_writer);
2678 nilfs->ns_writer = NULL;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002679 }
2680 return err;
2681}
2682
2683/**
Ryusuke Konishif7545142011-03-09 11:05:08 +09002684 * nilfs_detach_log_writer - destroy log writer
2685 * @sb: super block instance
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002686 *
Ryusuke Konishif7545142011-03-09 11:05:08 +09002687 * This kills log writer daemon, frees the log writer object, and
2688 * destroys list of dirty files.
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002689 */
Ryusuke Konishif7545142011-03-09 11:05:08 +09002690void nilfs_detach_log_writer(struct super_block *sb)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002691{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002692 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002693 LIST_HEAD(garbage_list);
2694
2695 down_write(&nilfs->ns_segctor_sem);
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002696 if (nilfs->ns_writer) {
2697 nilfs_segctor_destroy(nilfs->ns_writer);
2698 nilfs->ns_writer = NULL;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002699 }
2700
2701 /* Force to free the list of dirty files */
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002702 spin_lock(&nilfs->ns_inode_lock);
2703 if (!list_empty(&nilfs->ns_dirty_files)) {
2704 list_splice_init(&nilfs->ns_dirty_files, &garbage_list);
Ryusuke Konishif7545142011-03-09 11:05:08 +09002705 nilfs_warning(sb, __func__,
2706 "Hit dirty file after stopped log writer\n");
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002707 }
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002708 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002709 up_write(&nilfs->ns_segctor_sem);
2710
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002711 nilfs_dispose_list(nilfs, &garbage_list, 1);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002712}