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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 *
Ryusuke Konishi4b420ab2016-05-23 16:23:09 -070016 * Written by Ryusuke Konishi.
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070017 *
18 */
19
20#include <linux/pagemap.h>
21#include <linux/buffer_head.h>
22#include <linux/writeback.h>
Ryusuke Konishiead8ecf2015-04-16 12:46:28 -070023#include <linux/bitops.h>
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070024#include <linux/bio.h>
25#include <linux/completion.h>
26#include <linux/blkdev.h>
27#include <linux/backing-dev.h>
28#include <linux/freezer.h>
29#include <linux/kthread.h>
30#include <linux/crc32.h>
31#include <linux/pagevec.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090032#include <linux/slab.h>
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070033#include "nilfs.h"
34#include "btnode.h"
35#include "page.h"
36#include "segment.h"
37#include "sufile.h"
38#include "cpfile.h"
39#include "ifile.h"
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070040#include "segbuf.h"
41
42
43/*
44 * Segment constructor
45 */
46#define SC_N_INODEVEC 16 /* Size of locally allocated inode vector */
47
Ryusuke Konishi076a3782016-05-23 16:23:48 -070048#define SC_MAX_SEGDELTA 64 /*
49 * Upper limit of the number of segments
50 * appended in collection retry loop
51 */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070052
53/* Construction mode */
54enum {
55 SC_LSEG_SR = 1, /* Make a logical segment having a super root */
Ryusuke Konishi076a3782016-05-23 16:23:48 -070056 SC_LSEG_DSYNC, /*
57 * Flush data blocks of a given file and make
58 * a logical segment without a super root.
59 */
60 SC_FLUSH_FILE, /*
61 * Flush data files, leads to segment writes without
62 * creating a checkpoint.
63 */
64 SC_FLUSH_DAT, /*
65 * Flush DAT file. This also creates segments
66 * without a checkpoint.
67 */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070068};
69
70/* Stage numbers of dirty block collection */
71enum {
72 NILFS_ST_INIT = 0,
73 NILFS_ST_GC, /* Collecting dirty blocks for GC */
74 NILFS_ST_FILE,
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070075 NILFS_ST_IFILE,
76 NILFS_ST_CPFILE,
77 NILFS_ST_SUFILE,
78 NILFS_ST_DAT,
79 NILFS_ST_SR, /* Super root */
80 NILFS_ST_DSYNC, /* Data sync blocks */
81 NILFS_ST_DONE,
82};
83
Hitoshi Mitake58497702015-11-06 16:31:59 -080084#define CREATE_TRACE_POINTS
85#include <trace/events/nilfs2.h>
86
87/*
88 * nilfs_sc_cstage_inc(), nilfs_sc_cstage_set(), nilfs_sc_cstage_get() are
89 * wrapper functions of stage count (nilfs_sc_info->sc_stage.scnt). Users of
90 * the variable must use them because transition of stage count must involve
91 * trace events (trace_nilfs2_collection_stage_transition).
92 *
93 * nilfs_sc_cstage_get() isn't required for the above purpose because it doesn't
94 * produce tracepoint events. It is provided just for making the intention
95 * clear.
96 */
97static inline void nilfs_sc_cstage_inc(struct nilfs_sc_info *sci)
98{
99 sci->sc_stage.scnt++;
100 trace_nilfs2_collection_stage_transition(sci);
101}
102
103static inline void nilfs_sc_cstage_set(struct nilfs_sc_info *sci, int next_scnt)
104{
105 sci->sc_stage.scnt = next_scnt;
106 trace_nilfs2_collection_stage_transition(sci);
107}
108
109static inline int nilfs_sc_cstage_get(struct nilfs_sc_info *sci)
110{
111 return sci->sc_stage.scnt;
112}
113
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700114/* State flags of collection */
115#define NILFS_CF_NODE 0x0001 /* Collecting node blocks */
116#define NILFS_CF_IFILE_STARTED 0x0002 /* IFILE stage has started */
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +0900117#define NILFS_CF_SUFREED 0x0004 /* segment usages has been freed */
118#define NILFS_CF_HISTORY_MASK (NILFS_CF_IFILE_STARTED | NILFS_CF_SUFREED)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700119
120/* Operations depending on the construction mode and file type */
121struct nilfs_sc_operations {
122 int (*collect_data)(struct nilfs_sc_info *, struct buffer_head *,
123 struct inode *);
124 int (*collect_node)(struct nilfs_sc_info *, struct buffer_head *,
125 struct inode *);
126 int (*collect_bmap)(struct nilfs_sc_info *, struct buffer_head *,
127 struct inode *);
128 void (*write_data_binfo)(struct nilfs_sc_info *,
129 struct nilfs_segsum_pointer *,
130 union nilfs_binfo *);
131 void (*write_node_binfo)(struct nilfs_sc_info *,
132 struct nilfs_segsum_pointer *,
133 union nilfs_binfo *);
134};
135
136/*
137 * Other definitions
138 */
139static void nilfs_segctor_start_timer(struct nilfs_sc_info *);
140static void nilfs_segctor_do_flush(struct nilfs_sc_info *, int);
141static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *);
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900142static void nilfs_dispose_list(struct the_nilfs *, struct list_head *, int);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700143
144#define nilfs_cnt32_gt(a, b) \
145 (typecheck(__u32, a) && typecheck(__u32, b) && \
146 ((__s32)(b) - (__s32)(a) < 0))
147#define nilfs_cnt32_ge(a, b) \
148 (typecheck(__u32, a) && typecheck(__u32, b) && \
149 ((__s32)(a) - (__s32)(b) >= 0))
150#define nilfs_cnt32_lt(a, b) nilfs_cnt32_gt(b, a)
151#define nilfs_cnt32_le(a, b) nilfs_cnt32_ge(b, a)
152
Ryusuke Konishifeee8802016-08-02 14:05:10 -0700153static int nilfs_prepare_segment_lock(struct super_block *sb,
154 struct nilfs_transaction_info *ti)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700155{
156 struct nilfs_transaction_info *cur_ti = current->journal_info;
157 void *save = NULL;
158
159 if (cur_ti) {
160 if (cur_ti->ti_magic == NILFS_TI_MAGIC)
161 return ++cur_ti->ti_count;
Ryusuke Konishi7f001842016-05-23 16:23:42 -0700162
163 /*
164 * If journal_info field is occupied by other FS,
165 * it is saved and will be restored on
166 * nilfs_transaction_commit().
167 */
Ryusuke Konishifeee8802016-08-02 14:05:10 -0700168 nilfs_msg(sb, KERN_WARNING, "journal info from a different FS");
Ryusuke Konishi7f001842016-05-23 16:23:42 -0700169 save = current->journal_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700170 }
171 if (!ti) {
172 ti = kmem_cache_alloc(nilfs_transaction_cachep, GFP_NOFS);
173 if (!ti)
174 return -ENOMEM;
175 ti->ti_flags = NILFS_TI_DYNAMIC_ALLOC;
176 } else {
177 ti->ti_flags = 0;
178 }
179 ti->ti_count = 0;
180 ti->ti_save = save;
181 ti->ti_magic = NILFS_TI_MAGIC;
182 current->journal_info = ti;
183 return 0;
184}
185
186/**
187 * nilfs_transaction_begin - start indivisible file operations.
188 * @sb: super block
189 * @ti: nilfs_transaction_info
190 * @vacancy_check: flags for vacancy rate checks
191 *
192 * nilfs_transaction_begin() acquires a reader/writer semaphore, called
193 * the segment semaphore, to make a segment construction and write tasks
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700194 * exclusive. The function is used with nilfs_transaction_commit() in pairs.
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700195 * The region enclosed by these two functions can be nested. To avoid a
196 * deadlock, the semaphore is only acquired or released in the outermost call.
197 *
198 * This function allocates a nilfs_transaction_info struct to keep context
199 * information on it. It is initialized and hooked onto the current task in
200 * the outermost call. If a pre-allocated struct is given to @ti, it is used
Ryusuke Konishi7a650042010-03-14 03:32:40 +0900201 * instead; otherwise a new struct is assigned from a slab.
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700202 *
203 * When @vacancy_check flag is set, this function will check the amount of
204 * free space, and will wait for the GC to reclaim disk space if low capacity.
205 *
206 * Return Value: On success, 0 is returned. On error, one of the following
207 * negative error code is returned.
208 *
209 * %-ENOMEM - Insufficient memory available.
210 *
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700211 * %-ENOSPC - No space left on device
212 */
213int nilfs_transaction_begin(struct super_block *sb,
214 struct nilfs_transaction_info *ti,
215 int vacancy_check)
216{
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700217 struct the_nilfs *nilfs;
Ryusuke Konishifeee8802016-08-02 14:05:10 -0700218 int ret = nilfs_prepare_segment_lock(sb, ti);
Hitoshi Mitake44fda112015-11-06 16:32:02 -0800219 struct nilfs_transaction_info *trace_ti;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700220
221 if (unlikely(ret < 0))
222 return ret;
Hitoshi Mitake44fda112015-11-06 16:32:02 -0800223 if (ret > 0) {
224 trace_ti = current->journal_info;
225
226 trace_nilfs2_transaction_transition(sb, trace_ti,
227 trace_ti->ti_count, trace_ti->ti_flags,
228 TRACE_NILFS2_TRANSACTION_BEGIN);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700229 return 0;
Hitoshi Mitake44fda112015-11-06 16:32:02 -0800230 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700231
Jan Kara2c22b332012-06-12 16:20:44 +0200232 sb_start_intwrite(sb);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900233
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900234 nilfs = sb->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700235 down_read(&nilfs->ns_segctor_sem);
236 if (vacancy_check && nilfs_near_disk_full(nilfs)) {
237 up_read(&nilfs->ns_segctor_sem);
238 ret = -ENOSPC;
239 goto failed;
240 }
Hitoshi Mitake44fda112015-11-06 16:32:02 -0800241
242 trace_ti = current->journal_info;
243 trace_nilfs2_transaction_transition(sb, trace_ti, trace_ti->ti_count,
244 trace_ti->ti_flags,
245 TRACE_NILFS2_TRANSACTION_BEGIN);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700246 return 0;
247
248 failed:
249 ti = current->journal_info;
250 current->journal_info = ti->ti_save;
251 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
252 kmem_cache_free(nilfs_transaction_cachep, ti);
Jan Kara2c22b332012-06-12 16:20:44 +0200253 sb_end_intwrite(sb);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700254 return ret;
255}
256
257/**
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700258 * nilfs_transaction_commit - commit indivisible file operations.
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700259 * @sb: super block
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700260 *
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700261 * nilfs_transaction_commit() releases the read semaphore which is
262 * acquired by nilfs_transaction_begin(). This is only performed
263 * in outermost call of this function. If a commit flag is set,
264 * nilfs_transaction_commit() sets a timer to start the segment
265 * constructor. If a sync flag is set, it starts construction
266 * directly.
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700267 */
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700268int nilfs_transaction_commit(struct super_block *sb)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700269{
270 struct nilfs_transaction_info *ti = current->journal_info;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900271 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700272 int err = 0;
273
274 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700275 ti->ti_flags |= NILFS_TI_COMMIT;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700276 if (ti->ti_count > 0) {
277 ti->ti_count--;
Hitoshi Mitake44fda112015-11-06 16:32:02 -0800278 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
279 ti->ti_flags, TRACE_NILFS2_TRANSACTION_COMMIT);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700280 return 0;
281 }
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +0900282 if (nilfs->ns_writer) {
283 struct nilfs_sc_info *sci = nilfs->ns_writer;
284
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700285 if (ti->ti_flags & NILFS_TI_COMMIT)
286 nilfs_segctor_start_timer(sci);
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +0900287 if (atomic_read(&nilfs->ns_ndirtyblks) > sci->sc_watermark)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700288 nilfs_segctor_do_flush(sci, 0);
289 }
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +0900290 up_read(&nilfs->ns_segctor_sem);
Hitoshi Mitake44fda112015-11-06 16:32:02 -0800291 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
292 ti->ti_flags, TRACE_NILFS2_TRANSACTION_COMMIT);
293
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700294 current->journal_info = ti->ti_save;
295
296 if (ti->ti_flags & NILFS_TI_SYNC)
297 err = nilfs_construct_segment(sb);
298 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
299 kmem_cache_free(nilfs_transaction_cachep, ti);
Jan Kara2c22b332012-06-12 16:20:44 +0200300 sb_end_intwrite(sb);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700301 return err;
302}
303
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700304void nilfs_transaction_abort(struct super_block *sb)
305{
306 struct nilfs_transaction_info *ti = current->journal_info;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900307 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700308
309 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
310 if (ti->ti_count > 0) {
311 ti->ti_count--;
Hitoshi Mitake44fda112015-11-06 16:32:02 -0800312 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
313 ti->ti_flags, TRACE_NILFS2_TRANSACTION_ABORT);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700314 return;
315 }
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900316 up_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700317
Hitoshi Mitake44fda112015-11-06 16:32:02 -0800318 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
319 ti->ti_flags, TRACE_NILFS2_TRANSACTION_ABORT);
320
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700321 current->journal_info = ti->ti_save;
322 if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC)
323 kmem_cache_free(nilfs_transaction_cachep, ti);
Jan Kara2c22b332012-06-12 16:20:44 +0200324 sb_end_intwrite(sb);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700325}
326
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700327void nilfs_relax_pressure_in_lock(struct super_block *sb)
328{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900329 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +0900330 struct nilfs_sc_info *sci = nilfs->ns_writer;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700331
332 if (!sci || !sci->sc_flush_request)
333 return;
334
335 set_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags);
336 up_read(&nilfs->ns_segctor_sem);
337
338 down_write(&nilfs->ns_segctor_sem);
339 if (sci->sc_flush_request &&
340 test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags)) {
341 struct nilfs_transaction_info *ti = current->journal_info;
342
343 ti->ti_flags |= NILFS_TI_WRITER;
344 nilfs_segctor_do_immediate_flush(sci);
345 ti->ti_flags &= ~NILFS_TI_WRITER;
346 }
347 downgrade_write(&nilfs->ns_segctor_sem);
348}
349
Ryusuke Konishif7545142011-03-09 11:05:08 +0900350static void nilfs_transaction_lock(struct super_block *sb,
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700351 struct nilfs_transaction_info *ti,
352 int gcflag)
353{
354 struct nilfs_transaction_info *cur_ti = current->journal_info;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900355 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +0900356 struct nilfs_sc_info *sci = nilfs->ns_writer;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700357
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700358 WARN_ON(cur_ti);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700359 ti->ti_flags = NILFS_TI_WRITER;
360 ti->ti_count = 0;
361 ti->ti_save = cur_ti;
362 ti->ti_magic = NILFS_TI_MAGIC;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700363 current->journal_info = ti;
364
365 for (;;) {
Hitoshi Mitake44fda112015-11-06 16:32:02 -0800366 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
367 ti->ti_flags, TRACE_NILFS2_TRANSACTION_TRYLOCK);
368
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +0900369 down_write(&nilfs->ns_segctor_sem);
370 if (!test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700371 break;
372
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +0900373 nilfs_segctor_do_immediate_flush(sci);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700374
Ryusuke Konishif7545142011-03-09 11:05:08 +0900375 up_write(&nilfs->ns_segctor_sem);
Ryusuke Konishiaceb4172016-08-02 14:05:19 -0700376 cond_resched();
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700377 }
378 if (gcflag)
379 ti->ti_flags |= NILFS_TI_GC;
Hitoshi Mitake44fda112015-11-06 16:32:02 -0800380
381 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
382 ti->ti_flags, TRACE_NILFS2_TRANSACTION_LOCK);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700383}
384
Ryusuke Konishif7545142011-03-09 11:05:08 +0900385static void nilfs_transaction_unlock(struct super_block *sb)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700386{
387 struct nilfs_transaction_info *ti = current->journal_info;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900388 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700389
390 BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC);
391 BUG_ON(ti->ti_count > 0);
392
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900393 up_write(&nilfs->ns_segctor_sem);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700394 current->journal_info = ti->ti_save;
Hitoshi Mitake44fda112015-11-06 16:32:02 -0800395
396 trace_nilfs2_transaction_transition(sb, ti, ti->ti_count,
397 ti->ti_flags, TRACE_NILFS2_TRANSACTION_UNLOCK);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700398}
399
400static void *nilfs_segctor_map_segsum_entry(struct nilfs_sc_info *sci,
401 struct nilfs_segsum_pointer *ssp,
Ryusuke Konishi0c6c44c2016-05-23 16:23:39 -0700402 unsigned int bytes)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700403{
404 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
Ryusuke Konishi0c6c44c2016-05-23 16:23:39 -0700405 unsigned int blocksize = sci->sc_super->s_blocksize;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700406 void *p;
407
408 if (unlikely(ssp->offset + bytes > blocksize)) {
409 ssp->offset = 0;
410 BUG_ON(NILFS_SEGBUF_BH_IS_LAST(ssp->bh,
411 &segbuf->sb_segsum_buffers));
412 ssp->bh = NILFS_SEGBUF_NEXT_BH(ssp->bh);
413 }
414 p = ssp->bh->b_data + ssp->offset;
415 ssp->offset += bytes;
416 return p;
417}
418
419/**
420 * nilfs_segctor_reset_segment_buffer - reset the current segment buffer
421 * @sci: nilfs_sc_info
422 */
423static int nilfs_segctor_reset_segment_buffer(struct nilfs_sc_info *sci)
424{
425 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
426 struct buffer_head *sumbh;
Ryusuke Konishi0c6c44c2016-05-23 16:23:39 -0700427 unsigned int sumbytes;
428 unsigned int flags = 0;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700429 int err;
430
431 if (nilfs_doing_gc())
432 flags = NILFS_SS_GC;
Ryusuke Konishi6c43f412010-08-20 20:10:38 +0900433 err = nilfs_segbuf_reset(segbuf, flags, sci->sc_seg_ctime, sci->sc_cno);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700434 if (unlikely(err))
435 return err;
436
437 sumbh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers);
438 sumbytes = segbuf->sb_sum.sumbytes;
439 sci->sc_finfo_ptr.bh = sumbh; sci->sc_finfo_ptr.offset = sumbytes;
440 sci->sc_binfo_ptr.bh = sumbh; sci->sc_binfo_ptr.offset = sumbytes;
441 sci->sc_blk_cnt = sci->sc_datablk_cnt = 0;
442 return 0;
443}
444
445static int nilfs_segctor_feed_segment(struct nilfs_sc_info *sci)
446{
447 sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
448 if (NILFS_SEGBUF_IS_LAST(sci->sc_curseg, &sci->sc_segbufs))
Ryusuke Konishi076a3782016-05-23 16:23:48 -0700449 return -E2BIG; /*
450 * The current segment is filled up
451 * (internal code)
452 */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700453 sci->sc_curseg = NILFS_NEXT_SEGBUF(sci->sc_curseg);
454 return nilfs_segctor_reset_segment_buffer(sci);
455}
456
457static int nilfs_segctor_add_super_root(struct nilfs_sc_info *sci)
458{
459 struct nilfs_segment_buffer *segbuf = sci->sc_curseg;
460 int err;
461
462 if (segbuf->sb_sum.nblocks >= segbuf->sb_rest_blocks) {
463 err = nilfs_segctor_feed_segment(sci);
464 if (err)
465 return err;
466 segbuf = sci->sc_curseg;
467 }
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +0900468 err = nilfs_segbuf_extend_payload(segbuf, &segbuf->sb_super_root);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700469 if (likely(!err))
470 segbuf->sb_sum.flags |= NILFS_SS_SR;
471 return err;
472}
473
474/*
475 * Functions for making segment summary and payloads
476 */
477static int nilfs_segctor_segsum_block_required(
478 struct nilfs_sc_info *sci, const struct nilfs_segsum_pointer *ssp,
Ryusuke Konishi0c6c44c2016-05-23 16:23:39 -0700479 unsigned int binfo_size)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700480{
Ryusuke Konishi0c6c44c2016-05-23 16:23:39 -0700481 unsigned int blocksize = sci->sc_super->s_blocksize;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700482 /* Size of finfo and binfo is enough small against blocksize */
483
484 return ssp->offset + binfo_size +
485 (!sci->sc_blk_cnt ? sizeof(struct nilfs_finfo) : 0) >
486 blocksize;
487}
488
489static void nilfs_segctor_begin_finfo(struct nilfs_sc_info *sci,
490 struct inode *inode)
491{
492 sci->sc_curseg->sb_sum.nfinfo++;
493 sci->sc_binfo_ptr = sci->sc_finfo_ptr;
494 nilfs_segctor_map_segsum_entry(
495 sci, &sci->sc_binfo_ptr, sizeof(struct nilfs_finfo));
Ryusuke Konishic96fa462009-04-06 19:01:57 -0700496
Ryusuke Konishi72746ac2011-02-28 13:41:11 +0900497 if (NILFS_I(inode)->i_root &&
498 !test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags))
Ryusuke Konishic96fa462009-04-06 19:01:57 -0700499 set_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700500 /* skip finfo */
501}
502
503static void nilfs_segctor_end_finfo(struct nilfs_sc_info *sci,
504 struct inode *inode)
505{
506 struct nilfs_finfo *finfo;
507 struct nilfs_inode_info *ii;
508 struct nilfs_segment_buffer *segbuf;
Ryusuke Konishi6c43f412010-08-20 20:10:38 +0900509 __u64 cno;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700510
511 if (sci->sc_blk_cnt == 0)
512 return;
513
514 ii = NILFS_I(inode);
Ryusuke Konishi6c43f412010-08-20 20:10:38 +0900515
516 if (test_bit(NILFS_I_GCINODE, &ii->i_state))
517 cno = ii->i_cno;
518 else if (NILFS_ROOT_METADATA_FILE(inode->i_ino))
519 cno = 0;
520 else
521 cno = sci->sc_cno;
522
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700523 finfo = nilfs_segctor_map_segsum_entry(sci, &sci->sc_finfo_ptr,
524 sizeof(*finfo));
525 finfo->fi_ino = cpu_to_le64(inode->i_ino);
526 finfo->fi_nblocks = cpu_to_le32(sci->sc_blk_cnt);
527 finfo->fi_ndatablk = cpu_to_le32(sci->sc_datablk_cnt);
Ryusuke Konishi6c43f412010-08-20 20:10:38 +0900528 finfo->fi_cno = cpu_to_le64(cno);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700529
530 segbuf = sci->sc_curseg;
531 segbuf->sb_sum.sumbytes = sci->sc_binfo_ptr.offset +
532 sci->sc_super->s_blocksize * (segbuf->sb_sum.nsumblk - 1);
533 sci->sc_finfo_ptr = sci->sc_binfo_ptr;
534 sci->sc_blk_cnt = sci->sc_datablk_cnt = 0;
535}
536
537static int nilfs_segctor_add_file_block(struct nilfs_sc_info *sci,
538 struct buffer_head *bh,
539 struct inode *inode,
Ryusuke Konishi0c6c44c2016-05-23 16:23:39 -0700540 unsigned int binfo_size)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700541{
542 struct nilfs_segment_buffer *segbuf;
543 int required, err = 0;
544
545 retry:
546 segbuf = sci->sc_curseg;
547 required = nilfs_segctor_segsum_block_required(
548 sci, &sci->sc_binfo_ptr, binfo_size);
549 if (segbuf->sb_sum.nblocks + required + 1 > segbuf->sb_rest_blocks) {
550 nilfs_segctor_end_finfo(sci, inode);
551 err = nilfs_segctor_feed_segment(sci);
552 if (err)
553 return err;
554 goto retry;
555 }
556 if (unlikely(required)) {
557 err = nilfs_segbuf_extend_segsum(segbuf);
558 if (unlikely(err))
559 goto failed;
560 }
561 if (sci->sc_blk_cnt == 0)
562 nilfs_segctor_begin_finfo(sci, inode);
563
564 nilfs_segctor_map_segsum_entry(sci, &sci->sc_binfo_ptr, binfo_size);
565 /* Substitution to vblocknr is delayed until update_blocknr() */
566 nilfs_segbuf_add_file_buffer(segbuf, bh);
567 sci->sc_blk_cnt++;
568 failed:
569 return err;
570}
571
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700572/*
573 * Callback functions that enumerate, mark, and collect dirty blocks
574 */
575static int nilfs_collect_file_data(struct nilfs_sc_info *sci,
576 struct buffer_head *bh, struct inode *inode)
577{
578 int err;
579
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700580 err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
Ryusuke Konishie8289492010-11-19 15:26:20 +0900581 if (err < 0)
582 return err;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700583
584 err = nilfs_segctor_add_file_block(sci, bh, inode,
585 sizeof(struct nilfs_binfo_v));
586 if (!err)
587 sci->sc_datablk_cnt++;
588 return err;
589}
590
591static int nilfs_collect_file_node(struct nilfs_sc_info *sci,
592 struct buffer_head *bh,
593 struct inode *inode)
594{
Ryusuke Konishie8289492010-11-19 15:26:20 +0900595 return nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700596}
597
598static int nilfs_collect_file_bmap(struct nilfs_sc_info *sci,
599 struct buffer_head *bh,
600 struct inode *inode)
601{
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700602 WARN_ON(!buffer_dirty(bh));
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700603 return nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
604}
605
606static void nilfs_write_file_data_binfo(struct nilfs_sc_info *sci,
607 struct nilfs_segsum_pointer *ssp,
608 union nilfs_binfo *binfo)
609{
610 struct nilfs_binfo_v *binfo_v = nilfs_segctor_map_segsum_entry(
611 sci, ssp, sizeof(*binfo_v));
612 *binfo_v = binfo->bi_v;
613}
614
615static void nilfs_write_file_node_binfo(struct nilfs_sc_info *sci,
616 struct nilfs_segsum_pointer *ssp,
617 union nilfs_binfo *binfo)
618{
619 __le64 *vblocknr = nilfs_segctor_map_segsum_entry(
620 sci, ssp, sizeof(*vblocknr));
621 *vblocknr = binfo->bi_v.bi_vblocknr;
622}
623
Julia Lawall1c613cb2016-05-23 16:22:57 -0700624static const struct nilfs_sc_operations nilfs_sc_file_ops = {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700625 .collect_data = nilfs_collect_file_data,
626 .collect_node = nilfs_collect_file_node,
627 .collect_bmap = nilfs_collect_file_bmap,
628 .write_data_binfo = nilfs_write_file_data_binfo,
629 .write_node_binfo = nilfs_write_file_node_binfo,
630};
631
632static int nilfs_collect_dat_data(struct nilfs_sc_info *sci,
633 struct buffer_head *bh, struct inode *inode)
634{
635 int err;
636
637 err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
Ryusuke Konishie8289492010-11-19 15:26:20 +0900638 if (err < 0)
639 return err;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700640
641 err = nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
642 if (!err)
643 sci->sc_datablk_cnt++;
644 return err;
645}
646
647static int nilfs_collect_dat_bmap(struct nilfs_sc_info *sci,
648 struct buffer_head *bh, struct inode *inode)
649{
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700650 WARN_ON(!buffer_dirty(bh));
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700651 return nilfs_segctor_add_file_block(sci, bh, inode,
652 sizeof(struct nilfs_binfo_dat));
653}
654
655static void nilfs_write_dat_data_binfo(struct nilfs_sc_info *sci,
656 struct nilfs_segsum_pointer *ssp,
657 union nilfs_binfo *binfo)
658{
659 __le64 *blkoff = nilfs_segctor_map_segsum_entry(sci, ssp,
660 sizeof(*blkoff));
661 *blkoff = binfo->bi_dat.bi_blkoff;
662}
663
664static void nilfs_write_dat_node_binfo(struct nilfs_sc_info *sci,
665 struct nilfs_segsum_pointer *ssp,
666 union nilfs_binfo *binfo)
667{
668 struct nilfs_binfo_dat *binfo_dat =
669 nilfs_segctor_map_segsum_entry(sci, ssp, sizeof(*binfo_dat));
670 *binfo_dat = binfo->bi_dat;
671}
672
Julia Lawall1c613cb2016-05-23 16:22:57 -0700673static const struct nilfs_sc_operations nilfs_sc_dat_ops = {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700674 .collect_data = nilfs_collect_dat_data,
675 .collect_node = nilfs_collect_file_node,
676 .collect_bmap = nilfs_collect_dat_bmap,
677 .write_data_binfo = nilfs_write_dat_data_binfo,
678 .write_node_binfo = nilfs_write_dat_node_binfo,
679};
680
Julia Lawall1c613cb2016-05-23 16:22:57 -0700681static const struct nilfs_sc_operations nilfs_sc_dsync_ops = {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700682 .collect_data = nilfs_collect_file_data,
683 .collect_node = NULL,
684 .collect_bmap = NULL,
685 .write_data_binfo = nilfs_write_file_data_binfo,
686 .write_node_binfo = NULL,
687};
688
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700689static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode,
690 struct list_head *listp,
691 size_t nlimit,
692 loff_t start, loff_t end)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700693{
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700694 struct address_space *mapping = inode->i_mapping;
695 struct pagevec pvec;
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700696 pgoff_t index = 0, last = ULONG_MAX;
697 size_t ndirties = 0;
698 int i;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700699
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700700 if (unlikely(start != 0 || end != LLONG_MAX)) {
701 /*
702 * A valid range is given for sync-ing data pages. The
703 * range is rounded to per-page; extra dirty buffers
704 * may be included if blocksize < pagesize.
705 */
706 index = start >> PAGE_SHIFT;
707 last = end >> PAGE_SHIFT;
708 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700709 pagevec_init(&pvec, 0);
710 repeat:
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700711 if (unlikely(index > last) ||
712 !pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY,
713 min_t(pgoff_t, last - index,
714 PAGEVEC_SIZE - 1) + 1))
715 return ndirties;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700716
717 for (i = 0; i < pagevec_count(&pvec); i++) {
718 struct buffer_head *bh, *head;
719 struct page *page = pvec.pages[i];
720
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700721 if (unlikely(page->index > last))
722 break;
723
Ryusuke Konishiaa405b12011-05-05 12:56:51 +0900724 lock_page(page);
725 if (!page_has_buffers(page))
726 create_empty_buffers(page, 1 << inode->i_blkbits, 0);
727 unlock_page(page);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700728
729 bh = head = page_buffers(page);
730 do {
Vyacheslav Dubeyko7f42ec32013-09-30 13:45:12 -0700731 if (!buffer_dirty(bh) || buffer_async_write(bh))
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700732 continue;
733 get_bh(bh);
734 list_add_tail(&bh->b_assoc_buffers, listp);
735 ndirties++;
736 if (unlikely(ndirties >= nlimit)) {
737 pagevec_release(&pvec);
738 cond_resched();
739 return ndirties;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700740 }
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700741 } while (bh = bh->b_this_page, bh != head);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700742 }
743 pagevec_release(&pvec);
744 cond_resched();
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700745 goto repeat;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700746}
747
748static void nilfs_lookup_dirty_node_buffers(struct inode *inode,
749 struct list_head *listp)
750{
751 struct nilfs_inode_info *ii = NILFS_I(inode);
752 struct address_space *mapping = &ii->i_btnode_cache;
753 struct pagevec pvec;
754 struct buffer_head *bh, *head;
755 unsigned int i;
756 pgoff_t index = 0;
757
758 pagevec_init(&pvec, 0);
759
760 while (pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY,
761 PAGEVEC_SIZE)) {
762 for (i = 0; i < pagevec_count(&pvec); i++) {
763 bh = head = page_buffers(pvec.pages[i]);
764 do {
Vyacheslav Dubeyko7f42ec32013-09-30 13:45:12 -0700765 if (buffer_dirty(bh) &&
766 !buffer_async_write(bh)) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700767 get_bh(bh);
768 list_add_tail(&bh->b_assoc_buffers,
769 listp);
770 }
771 bh = bh->b_this_page;
772 } while (bh != head);
773 }
774 pagevec_release(&pvec);
775 cond_resched();
776 }
777}
778
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900779static void nilfs_dispose_list(struct the_nilfs *nilfs,
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700780 struct list_head *head, int force)
781{
782 struct nilfs_inode_info *ii, *n;
783 struct nilfs_inode_info *ivec[SC_N_INODEVEC], **pii;
Ryusuke Konishi0c6c44c2016-05-23 16:23:39 -0700784 unsigned int nv = 0;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700785
786 while (!list_empty(head)) {
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900787 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700788 list_for_each_entry_safe(ii, n, head, i_dirty) {
789 list_del_init(&ii->i_dirty);
790 if (force) {
791 if (unlikely(ii->i_bh)) {
792 brelse(ii->i_bh);
793 ii->i_bh = NULL;
794 }
795 } else if (test_bit(NILFS_I_DIRTY, &ii->i_state)) {
796 set_bit(NILFS_I_QUEUED, &ii->i_state);
797 list_add_tail(&ii->i_dirty,
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900798 &nilfs->ns_dirty_files);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700799 continue;
800 }
801 ivec[nv++] = ii;
802 if (nv == SC_N_INODEVEC)
803 break;
804 }
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900805 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700806
807 for (pii = ivec; nv > 0; pii++, nv--)
808 iput(&(*pii)->vfs_inode);
809 }
810}
811
Ryusuke Konishi7ef3ff22015-02-05 12:25:20 -0800812static void nilfs_iput_work_func(struct work_struct *work)
813{
814 struct nilfs_sc_info *sci = container_of(work, struct nilfs_sc_info,
815 sc_iput_work);
816 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
817
818 nilfs_dispose_list(nilfs, &sci->sc_iput_queue, 0);
819}
820
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900821static int nilfs_test_metadata_dirty(struct the_nilfs *nilfs,
822 struct nilfs_root *root)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700823{
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700824 int ret = 0;
825
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900826 if (nilfs_mdt_fetch_dirty(root->ifile))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700827 ret++;
828 if (nilfs_mdt_fetch_dirty(nilfs->ns_cpfile))
829 ret++;
830 if (nilfs_mdt_fetch_dirty(nilfs->ns_sufile))
831 ret++;
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900832 if ((ret || nilfs_doing_gc()) && nilfs_mdt_fetch_dirty(nilfs->ns_dat))
833 ret++;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700834 return ret;
835}
836
837static int nilfs_segctor_clean(struct nilfs_sc_info *sci)
838{
839 return list_empty(&sci->sc_dirty_files) &&
840 !test_bit(NILFS_SC_DIRTY, &sci->sc_flags) &&
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +0900841 sci->sc_nfreesegs == 0 &&
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700842 (!nilfs_doing_gc() || list_empty(&sci->sc_gc_inodes));
843}
844
845static int nilfs_segctor_confirm(struct nilfs_sc_info *sci)
846{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900847 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700848 int ret = 0;
849
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900850 if (nilfs_test_metadata_dirty(nilfs, sci->sc_root))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700851 set_bit(NILFS_SC_DIRTY, &sci->sc_flags);
852
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900853 spin_lock(&nilfs->ns_inode_lock);
854 if (list_empty(&nilfs->ns_dirty_files) && nilfs_segctor_clean(sci))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700855 ret++;
856
Ryusuke Konishi693dd322011-03-09 11:05:07 +0900857 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700858 return ret;
859}
860
861static void nilfs_segctor_clear_metadata_dirty(struct nilfs_sc_info *sci)
862{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900863 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700864
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900865 nilfs_mdt_clear_dirty(sci->sc_root->ifile);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700866 nilfs_mdt_clear_dirty(nilfs->ns_cpfile);
867 nilfs_mdt_clear_dirty(nilfs->ns_sufile);
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900868 nilfs_mdt_clear_dirty(nilfs->ns_dat);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700869}
870
871static int nilfs_segctor_create_checkpoint(struct nilfs_sc_info *sci)
872{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900873 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700874 struct buffer_head *bh_cp;
875 struct nilfs_checkpoint *raw_cp;
876 int err;
877
878 /* XXX: this interface will be changed */
879 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 1,
880 &raw_cp, &bh_cp);
881 if (likely(!err)) {
Ryusuke Konishi076a3782016-05-23 16:23:48 -0700882 /*
883 * The following code is duplicated with cpfile. But, it is
884 * needed to collect the checkpoint even if it was not newly
885 * created.
886 */
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +0900887 mark_buffer_dirty(bh_cp);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700888 nilfs_mdt_mark_dirty(nilfs->ns_cpfile);
889 nilfs_cpfile_put_checkpoint(
890 nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700891 } else
892 WARN_ON(err == -EINVAL || err == -ENOENT);
893
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700894 return err;
895}
896
897static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci)
898{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900899 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700900 struct buffer_head *bh_cp;
901 struct nilfs_checkpoint *raw_cp;
902 int err;
903
904 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 0,
905 &raw_cp, &bh_cp);
906 if (unlikely(err)) {
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700907 WARN_ON(err == -EINVAL || err == -ENOENT);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700908 goto failed_ibh;
909 }
910 raw_cp->cp_snapshot_list.ssl_next = 0;
911 raw_cp->cp_snapshot_list.ssl_prev = 0;
912 raw_cp->cp_inodes_count =
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -0700913 cpu_to_le64(atomic64_read(&sci->sc_root->inodes_count));
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700914 raw_cp->cp_blocks_count =
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -0700915 cpu_to_le64(atomic64_read(&sci->sc_root->blocks_count));
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700916 raw_cp->cp_nblk_inc =
917 cpu_to_le64(sci->sc_nblk_inc + sci->sc_nblk_this_inc);
918 raw_cp->cp_create = cpu_to_le64(sci->sc_seg_ctime);
919 raw_cp->cp_cno = cpu_to_le64(nilfs->ns_cno);
Ryusuke Konishi458c5b02009-04-06 19:01:56 -0700920
Ryusuke Konishic96fa462009-04-06 19:01:57 -0700921 if (test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags))
922 nilfs_checkpoint_clear_minor(raw_cp);
923 else
924 nilfs_checkpoint_set_minor(raw_cp);
925
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900926 nilfs_write_inode_common(sci->sc_root->ifile,
927 &raw_cp->cp_ifile_inode, 1);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700928 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
929 return 0;
930
931 failed_ibh:
932 return err;
933}
934
935static void nilfs_fill_in_file_bmap(struct inode *ifile,
936 struct nilfs_inode_info *ii)
937
938{
939 struct buffer_head *ibh;
940 struct nilfs_inode *raw_inode;
941
942 if (test_bit(NILFS_I_BMAP, &ii->i_state)) {
943 ibh = ii->i_bh;
944 BUG_ON(!ibh);
945 raw_inode = nilfs_ifile_map_inode(ifile, ii->vfs_inode.i_ino,
946 ibh);
947 nilfs_bmap_write(ii->i_bmap, raw_inode);
948 nilfs_ifile_unmap_inode(ifile, ii->vfs_inode.i_ino, ibh);
949 }
950}
951
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900952static void nilfs_segctor_fill_in_file_bmap(struct nilfs_sc_info *sci)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700953{
954 struct nilfs_inode_info *ii;
955
956 list_for_each_entry(ii, &sci->sc_dirty_files, i_dirty) {
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900957 nilfs_fill_in_file_bmap(sci->sc_root->ifile, ii);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700958 set_bit(NILFS_I_COLLECTED, &ii->i_state);
959 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700960}
961
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700962static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info *sci,
963 struct the_nilfs *nilfs)
964{
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +0900965 struct buffer_head *bh_sr;
966 struct nilfs_super_root *raw_sr;
Ryusuke Konishi0c6c44c2016-05-23 16:23:39 -0700967 unsigned int isz, srsz;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700968
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +0900969 bh_sr = NILFS_LAST_SEGBUF(&sci->sc_segbufs)->sb_super_root;
970 raw_sr = (struct nilfs_super_root *)bh_sr->b_data;
Ryusuke Konishi56eb5532011-04-30 18:56:12 +0900971 isz = nilfs->ns_inode_size;
972 srsz = NILFS_SR_BYTES(isz);
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +0900973
Ryusuke Konishi56eb5532011-04-30 18:56:12 +0900974 raw_sr->sr_bytes = cpu_to_le16(srsz);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700975 raw_sr->sr_nongc_ctime
976 = cpu_to_le64(nilfs_doing_gc() ?
977 nilfs->ns_nongc_ctime : sci->sc_seg_ctime);
978 raw_sr->sr_flags = 0;
979
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900980 nilfs_write_inode_common(nilfs->ns_dat, (void *)raw_sr +
Ryusuke Konishi3961f0e2009-11-13 01:55:02 +0900981 NILFS_SR_DAT_OFFSET(isz), 1);
982 nilfs_write_inode_common(nilfs->ns_cpfile, (void *)raw_sr +
983 NILFS_SR_CPFILE_OFFSET(isz), 1);
984 nilfs_write_inode_common(nilfs->ns_sufile, (void *)raw_sr +
985 NILFS_SR_SUFILE_OFFSET(isz), 1);
Ryusuke Konishi56eb5532011-04-30 18:56:12 +0900986 memset((void *)raw_sr + srsz, 0, nilfs->ns_blocksize - srsz);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700987}
988
989static void nilfs_redirty_inodes(struct list_head *head)
990{
991 struct nilfs_inode_info *ii;
992
993 list_for_each_entry(ii, head, i_dirty) {
994 if (test_bit(NILFS_I_COLLECTED, &ii->i_state))
995 clear_bit(NILFS_I_COLLECTED, &ii->i_state);
996 }
997}
998
999static void nilfs_drop_collected_inodes(struct list_head *head)
1000{
1001 struct nilfs_inode_info *ii;
1002
1003 list_for_each_entry(ii, head, i_dirty) {
1004 if (!test_and_clear_bit(NILFS_I_COLLECTED, &ii->i_state))
1005 continue;
1006
Andreas Rohnerb9f66142014-10-13 15:53:22 -07001007 clear_bit(NILFS_I_INODE_SYNC, &ii->i_state);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001008 set_bit(NILFS_I_UPDATED, &ii->i_state);
1009 }
1010}
1011
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001012static int nilfs_segctor_apply_buffers(struct nilfs_sc_info *sci,
1013 struct inode *inode,
1014 struct list_head *listp,
1015 int (*collect)(struct nilfs_sc_info *,
1016 struct buffer_head *,
1017 struct inode *))
1018{
1019 struct buffer_head *bh, *n;
1020 int err = 0;
1021
1022 if (collect) {
1023 list_for_each_entry_safe(bh, n, listp, b_assoc_buffers) {
1024 list_del_init(&bh->b_assoc_buffers);
1025 err = collect(sci, bh, inode);
1026 brelse(bh);
1027 if (unlikely(err))
1028 goto dispose_buffers;
1029 }
1030 return 0;
1031 }
1032
1033 dispose_buffers:
1034 while (!list_empty(listp)) {
Ryusuke Konishi0cc1283882011-05-05 12:56:51 +09001035 bh = list_first_entry(listp, struct buffer_head,
1036 b_assoc_buffers);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001037 list_del_init(&bh->b_assoc_buffers);
1038 brelse(bh);
1039 }
1040 return err;
1041}
1042
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07001043static size_t nilfs_segctor_buffer_rest(struct nilfs_sc_info *sci)
1044{
1045 /* Remaining number of blocks within segment buffer */
1046 return sci->sc_segbuf_nblocks -
1047 (sci->sc_nblk_this_inc + sci->sc_curseg->sb_sum.nblocks);
1048}
1049
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001050static int nilfs_segctor_scan_file(struct nilfs_sc_info *sci,
1051 struct inode *inode,
Julia Lawall1c613cb2016-05-23 16:22:57 -07001052 const struct nilfs_sc_operations *sc_ops)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001053{
1054 LIST_HEAD(data_buffers);
1055 LIST_HEAD(node_buffers);
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07001056 int err;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001057
1058 if (!(sci->sc_stage.flags & NILFS_CF_NODE)) {
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07001059 size_t n, rest = nilfs_segctor_buffer_rest(sci);
1060
1061 n = nilfs_lookup_dirty_data_buffers(
1062 inode, &data_buffers, rest + 1, 0, LLONG_MAX);
1063 if (n > rest) {
1064 err = nilfs_segctor_apply_buffers(
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001065 sci, inode, &data_buffers,
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07001066 sc_ops->collect_data);
1067 BUG_ON(!err); /* always receive -E2BIG or true error */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001068 goto break_or_fail;
1069 }
1070 }
1071 nilfs_lookup_dirty_node_buffers(inode, &node_buffers);
1072
1073 if (!(sci->sc_stage.flags & NILFS_CF_NODE)) {
1074 err = nilfs_segctor_apply_buffers(
1075 sci, inode, &data_buffers, sc_ops->collect_data);
1076 if (unlikely(err)) {
1077 /* dispose node list */
1078 nilfs_segctor_apply_buffers(
1079 sci, inode, &node_buffers, NULL);
1080 goto break_or_fail;
1081 }
1082 sci->sc_stage.flags |= NILFS_CF_NODE;
1083 }
1084 /* Collect node */
1085 err = nilfs_segctor_apply_buffers(
1086 sci, inode, &node_buffers, sc_ops->collect_node);
1087 if (unlikely(err))
1088 goto break_or_fail;
1089
1090 nilfs_bmap_lookup_dirty_buffers(NILFS_I(inode)->i_bmap, &node_buffers);
1091 err = nilfs_segctor_apply_buffers(
1092 sci, inode, &node_buffers, sc_ops->collect_bmap);
1093 if (unlikely(err))
1094 goto break_or_fail;
1095
1096 nilfs_segctor_end_finfo(sci, inode);
1097 sci->sc_stage.flags &= ~NILFS_CF_NODE;
1098
1099 break_or_fail:
1100 return err;
1101}
1102
1103static int nilfs_segctor_scan_file_dsync(struct nilfs_sc_info *sci,
1104 struct inode *inode)
1105{
1106 LIST_HEAD(data_buffers);
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07001107 size_t n, rest = nilfs_segctor_buffer_rest(sci);
1108 int err;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001109
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07001110 n = nilfs_lookup_dirty_data_buffers(inode, &data_buffers, rest + 1,
1111 sci->sc_dsync_start,
1112 sci->sc_dsync_end);
1113
1114 err = nilfs_segctor_apply_buffers(sci, inode, &data_buffers,
1115 nilfs_collect_file_data);
1116 if (!err) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001117 nilfs_segctor_end_finfo(sci, inode);
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07001118 BUG_ON(n > rest);
1119 /* always receive -E2BIG or true error if n > rest */
1120 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001121 return err;
1122}
1123
1124static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode)
1125{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001126 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001127 struct list_head *head;
1128 struct nilfs_inode_info *ii;
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +09001129 size_t ndone;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001130 int err = 0;
1131
Hitoshi Mitake58497702015-11-06 16:31:59 -08001132 switch (nilfs_sc_cstage_get(sci)) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001133 case NILFS_ST_INIT:
1134 /* Pre-processes */
1135 sci->sc_stage.flags = 0;
1136
1137 if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) {
1138 sci->sc_nblk_inc = 0;
1139 sci->sc_curseg->sb_sum.flags = NILFS_SS_LOGBGN;
1140 if (mode == SC_LSEG_DSYNC) {
Hitoshi Mitake58497702015-11-06 16:31:59 -08001141 nilfs_sc_cstage_set(sci, NILFS_ST_DSYNC);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001142 goto dsync_mode;
1143 }
1144 }
1145
1146 sci->sc_stage.dirty_file_ptr = NULL;
1147 sci->sc_stage.gc_inode_ptr = NULL;
1148 if (mode == SC_FLUSH_DAT) {
Hitoshi Mitake58497702015-11-06 16:31:59 -08001149 nilfs_sc_cstage_set(sci, NILFS_ST_DAT);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001150 goto dat_stage;
1151 }
Hitoshi Mitake58497702015-11-06 16:31:59 -08001152 nilfs_sc_cstage_inc(sci); /* Fall through */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001153 case NILFS_ST_GC:
1154 if (nilfs_doing_gc()) {
1155 head = &sci->sc_gc_inodes;
1156 ii = list_prepare_entry(sci->sc_stage.gc_inode_ptr,
1157 head, i_dirty);
1158 list_for_each_entry_continue(ii, head, i_dirty) {
1159 err = nilfs_segctor_scan_file(
1160 sci, &ii->vfs_inode,
1161 &nilfs_sc_file_ops);
1162 if (unlikely(err)) {
1163 sci->sc_stage.gc_inode_ptr = list_entry(
1164 ii->i_dirty.prev,
1165 struct nilfs_inode_info,
1166 i_dirty);
1167 goto break_or_fail;
1168 }
1169 set_bit(NILFS_I_COLLECTED, &ii->i_state);
1170 }
1171 sci->sc_stage.gc_inode_ptr = NULL;
1172 }
Hitoshi Mitake58497702015-11-06 16:31:59 -08001173 nilfs_sc_cstage_inc(sci); /* Fall through */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001174 case NILFS_ST_FILE:
1175 head = &sci->sc_dirty_files;
1176 ii = list_prepare_entry(sci->sc_stage.dirty_file_ptr, head,
1177 i_dirty);
1178 list_for_each_entry_continue(ii, head, i_dirty) {
1179 clear_bit(NILFS_I_DIRTY, &ii->i_state);
1180
1181 err = nilfs_segctor_scan_file(sci, &ii->vfs_inode,
1182 &nilfs_sc_file_ops);
1183 if (unlikely(err)) {
1184 sci->sc_stage.dirty_file_ptr =
1185 list_entry(ii->i_dirty.prev,
1186 struct nilfs_inode_info,
1187 i_dirty);
1188 goto break_or_fail;
1189 }
1190 /* sci->sc_stage.dirty_file_ptr = NILFS_I(inode); */
1191 /* XXX: required ? */
1192 }
1193 sci->sc_stage.dirty_file_ptr = NULL;
1194 if (mode == SC_FLUSH_FILE) {
Hitoshi Mitake58497702015-11-06 16:31:59 -08001195 nilfs_sc_cstage_set(sci, NILFS_ST_DONE);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001196 return 0;
1197 }
Hitoshi Mitake58497702015-11-06 16:31:59 -08001198 nilfs_sc_cstage_inc(sci);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001199 sci->sc_stage.flags |= NILFS_CF_IFILE_STARTED;
1200 /* Fall through */
1201 case NILFS_ST_IFILE:
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001202 err = nilfs_segctor_scan_file(sci, sci->sc_root->ifile,
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001203 &nilfs_sc_file_ops);
1204 if (unlikely(err))
1205 break;
Hitoshi Mitake58497702015-11-06 16:31:59 -08001206 nilfs_sc_cstage_inc(sci);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001207 /* Creating a checkpoint */
1208 err = nilfs_segctor_create_checkpoint(sci);
1209 if (unlikely(err))
1210 break;
1211 /* Fall through */
1212 case NILFS_ST_CPFILE:
1213 err = nilfs_segctor_scan_file(sci, nilfs->ns_cpfile,
1214 &nilfs_sc_file_ops);
1215 if (unlikely(err))
1216 break;
Hitoshi Mitake58497702015-11-06 16:31:59 -08001217 nilfs_sc_cstage_inc(sci); /* Fall through */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001218 case NILFS_ST_SUFILE:
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +09001219 err = nilfs_sufile_freev(nilfs->ns_sufile, sci->sc_freesegs,
1220 sci->sc_nfreesegs, &ndone);
1221 if (unlikely(err)) {
1222 nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1223 sci->sc_freesegs, ndone,
1224 NULL);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001225 break;
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +09001226 }
1227 sci->sc_stage.flags |= NILFS_CF_SUFREED;
1228
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001229 err = nilfs_segctor_scan_file(sci, nilfs->ns_sufile,
1230 &nilfs_sc_file_ops);
1231 if (unlikely(err))
1232 break;
Hitoshi Mitake58497702015-11-06 16:31:59 -08001233 nilfs_sc_cstage_inc(sci); /* Fall through */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001234 case NILFS_ST_DAT:
1235 dat_stage:
Ryusuke Konishi365e2152010-12-27 00:07:30 +09001236 err = nilfs_segctor_scan_file(sci, nilfs->ns_dat,
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001237 &nilfs_sc_dat_ops);
1238 if (unlikely(err))
1239 break;
1240 if (mode == SC_FLUSH_DAT) {
Hitoshi Mitake58497702015-11-06 16:31:59 -08001241 nilfs_sc_cstage_set(sci, NILFS_ST_DONE);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001242 return 0;
1243 }
Hitoshi Mitake58497702015-11-06 16:31:59 -08001244 nilfs_sc_cstage_inc(sci); /* Fall through */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001245 case NILFS_ST_SR:
1246 if (mode == SC_LSEG_SR) {
1247 /* Appending a super root */
1248 err = nilfs_segctor_add_super_root(sci);
1249 if (unlikely(err))
1250 break;
1251 }
1252 /* End of a logical segment */
1253 sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND;
Hitoshi Mitake58497702015-11-06 16:31:59 -08001254 nilfs_sc_cstage_set(sci, NILFS_ST_DONE);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001255 return 0;
1256 case NILFS_ST_DSYNC:
1257 dsync_mode:
1258 sci->sc_curseg->sb_sum.flags |= NILFS_SS_SYNDT;
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07001259 ii = sci->sc_dsync_inode;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001260 if (!test_bit(NILFS_I_BUSY, &ii->i_state))
1261 break;
1262
1263 err = nilfs_segctor_scan_file_dsync(sci, &ii->vfs_inode);
1264 if (unlikely(err))
1265 break;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001266 sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND;
Hitoshi Mitake58497702015-11-06 16:31:59 -08001267 nilfs_sc_cstage_set(sci, NILFS_ST_DONE);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001268 return 0;
1269 case NILFS_ST_DONE:
1270 return 0;
1271 default:
1272 BUG();
1273 }
1274
1275 break_or_fail:
1276 return err;
1277}
1278
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001279/**
1280 * nilfs_segctor_begin_construction - setup segment buffer to make a new log
1281 * @sci: nilfs_sc_info
1282 * @nilfs: nilfs object
1283 */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001284static int nilfs_segctor_begin_construction(struct nilfs_sc_info *sci,
1285 struct the_nilfs *nilfs)
1286{
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001287 struct nilfs_segment_buffer *segbuf, *prev;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001288 __u64 nextnum;
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001289 int err, alloc = 0;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001290
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001291 segbuf = nilfs_segbuf_new(sci->sc_super);
1292 if (unlikely(!segbuf))
1293 return -ENOMEM;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001294
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001295 if (list_empty(&sci->sc_write_logs)) {
1296 nilfs_segbuf_map(segbuf, nilfs->ns_segnum,
1297 nilfs->ns_pseg_offset, nilfs);
1298 if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
1299 nilfs_shift_to_next_segment(nilfs);
1300 nilfs_segbuf_map(segbuf, nilfs->ns_segnum, 0, nilfs);
1301 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001302
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001303 segbuf->sb_sum.seg_seq = nilfs->ns_seg_seq;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001304 nextnum = nilfs->ns_nextnum;
1305
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001306 if (nilfs->ns_segnum == nilfs->ns_nextnum)
1307 /* Start from the head of a new full segment */
1308 alloc++;
1309 } else {
1310 /* Continue logs */
1311 prev = NILFS_LAST_SEGBUF(&sci->sc_write_logs);
1312 nilfs_segbuf_map_cont(segbuf, prev);
1313 segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq;
1314 nextnum = prev->sb_nextnum;
1315
1316 if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
1317 nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs);
1318 segbuf->sb_sum.seg_seq++;
1319 alloc++;
1320 }
1321 }
1322
1323 err = nilfs_sufile_mark_dirty(nilfs->ns_sufile, segbuf->sb_segnum);
1324 if (err)
1325 goto failed;
1326
1327 if (alloc) {
1328 err = nilfs_sufile_alloc(nilfs->ns_sufile, &nextnum);
1329 if (err)
1330 goto failed;
1331 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001332 nilfs_segbuf_set_next_segnum(segbuf, nextnum, nilfs);
1333
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001334 BUG_ON(!list_empty(&sci->sc_segbufs));
1335 list_add_tail(&segbuf->sb_list, &sci->sc_segbufs);
1336 sci->sc_segbuf_nblocks = segbuf->sb_rest_blocks;
Ryusuke Konishicece5522009-04-06 19:01:58 -07001337 return 0;
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001338
1339 failed:
1340 nilfs_segbuf_free(segbuf);
1341 return err;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001342}
1343
1344static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci,
1345 struct the_nilfs *nilfs, int nadd)
1346{
Ryusuke Konishie29df392009-11-29 16:51:16 +09001347 struct nilfs_segment_buffer *segbuf, *prev;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001348 struct inode *sufile = nilfs->ns_sufile;
1349 __u64 nextnextnum;
1350 LIST_HEAD(list);
1351 int err, ret, i;
1352
1353 prev = NILFS_LAST_SEGBUF(&sci->sc_segbufs);
1354 /*
1355 * Since the segment specified with nextnum might be allocated during
1356 * the previous construction, the buffer including its segusage may
1357 * not be dirty. The following call ensures that the buffer is dirty
1358 * and will pin the buffer on memory until the sufile is written.
1359 */
Ryusuke Konishi61a189e2009-11-18 17:25:12 +09001360 err = nilfs_sufile_mark_dirty(sufile, prev->sb_nextnum);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001361 if (unlikely(err))
1362 return err;
1363
1364 for (i = 0; i < nadd; i++) {
1365 /* extend segment info */
1366 err = -ENOMEM;
1367 segbuf = nilfs_segbuf_new(sci->sc_super);
1368 if (unlikely(!segbuf))
1369 goto failed;
1370
1371 /* map this buffer to region of segment on-disk */
Ryusuke Konishicece5522009-04-06 19:01:58 -07001372 nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001373 sci->sc_segbuf_nblocks += segbuf->sb_rest_blocks;
1374
1375 /* allocate the next next full segment */
1376 err = nilfs_sufile_alloc(sufile, &nextnextnum);
1377 if (unlikely(err))
1378 goto failed_segbuf;
1379
1380 segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq + 1;
1381 nilfs_segbuf_set_next_segnum(segbuf, nextnextnum, nilfs);
1382
1383 list_add_tail(&segbuf->sb_list, &list);
1384 prev = segbuf;
1385 }
Ryusuke Konishi0935db72009-11-29 02:39:11 +09001386 list_splice_tail(&list, &sci->sc_segbufs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001387 return 0;
1388
1389 failed_segbuf:
1390 nilfs_segbuf_free(segbuf);
1391 failed:
Ryusuke Konishie29df392009-11-29 16:51:16 +09001392 list_for_each_entry(segbuf, &list, sb_list) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001393 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -07001394 WARN_ON(ret); /* never fails */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001395 }
Ryusuke Konishie29df392009-11-29 16:51:16 +09001396 nilfs_destroy_logs(&list);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001397 return err;
1398}
1399
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001400static void nilfs_free_incomplete_logs(struct list_head *logs,
1401 struct the_nilfs *nilfs)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001402{
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001403 struct nilfs_segment_buffer *segbuf, *prev;
1404 struct inode *sufile = nilfs->ns_sufile;
Ryusuke Konishi9284ad22009-11-25 01:04:21 +09001405 int ret;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001406
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001407 segbuf = NILFS_FIRST_SEGBUF(logs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001408 if (nilfs->ns_nextnum != segbuf->sb_nextnum) {
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001409 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -07001410 WARN_ON(ret); /* never fails */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001411 }
Ryusuke Konishi9284ad22009-11-25 01:04:21 +09001412 if (atomic_read(&segbuf->sb_err)) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001413 /* Case 1: The first segment failed */
1414 if (segbuf->sb_pseg_start != segbuf->sb_fseg_start)
Ryusuke Konishi076a3782016-05-23 16:23:48 -07001415 /*
1416 * Case 1a: Partial segment appended into an existing
1417 * segment
1418 */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001419 nilfs_terminate_segment(nilfs, segbuf->sb_fseg_start,
1420 segbuf->sb_fseg_end);
1421 else /* Case 1b: New full segment */
1422 set_nilfs_discontinued(nilfs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001423 }
1424
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001425 prev = segbuf;
1426 list_for_each_entry_continue(segbuf, logs, sb_list) {
1427 if (prev->sb_nextnum != segbuf->sb_nextnum) {
1428 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
1429 WARN_ON(ret); /* never fails */
1430 }
Ryusuke Konishi9284ad22009-11-25 01:04:21 +09001431 if (atomic_read(&segbuf->sb_err) &&
1432 segbuf->sb_segnum != nilfs->ns_nextnum)
1433 /* Case 2: extended segment (!= next) failed */
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001434 nilfs_sufile_set_error(sufile, segbuf->sb_segnum);
1435 prev = segbuf;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001436 }
1437}
1438
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001439static void nilfs_segctor_update_segusage(struct nilfs_sc_info *sci,
1440 struct inode *sufile)
1441{
1442 struct nilfs_segment_buffer *segbuf;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001443 unsigned long live_blocks;
1444 int ret;
1445
1446 list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001447 live_blocks = segbuf->sb_sum.nblocks +
1448 (segbuf->sb_pseg_start - segbuf->sb_fseg_start);
Ryusuke Konishi071ec542009-11-18 18:23:34 +09001449 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1450 live_blocks,
1451 sci->sc_seg_ctime);
1452 WARN_ON(ret); /* always succeed because the segusage is dirty */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001453 }
1454}
1455
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001456static void nilfs_cancel_segusage(struct list_head *logs, struct inode *sufile)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001457{
1458 struct nilfs_segment_buffer *segbuf;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001459 int ret;
1460
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001461 segbuf = NILFS_FIRST_SEGBUF(logs);
Ryusuke Konishi071ec542009-11-18 18:23:34 +09001462 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1463 segbuf->sb_pseg_start -
1464 segbuf->sb_fseg_start, 0);
1465 WARN_ON(ret); /* always succeed because the segusage is dirty */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001466
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001467 list_for_each_entry_continue(segbuf, logs, sb_list) {
Ryusuke Konishi071ec542009-11-18 18:23:34 +09001468 ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
1469 0, 0);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -07001470 WARN_ON(ret); /* always succeed */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001471 }
1472}
1473
1474static void nilfs_segctor_truncate_segments(struct nilfs_sc_info *sci,
1475 struct nilfs_segment_buffer *last,
1476 struct inode *sufile)
1477{
Ryusuke Konishie29df392009-11-29 16:51:16 +09001478 struct nilfs_segment_buffer *segbuf = last;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001479 int ret;
1480
Ryusuke Konishie29df392009-11-29 16:51:16 +09001481 list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001482 sci->sc_segbuf_nblocks -= segbuf->sb_rest_blocks;
1483 ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -07001484 WARN_ON(ret);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001485 }
Ryusuke Konishie29df392009-11-29 16:51:16 +09001486 nilfs_truncate_logs(&sci->sc_segbufs, last);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001487}
1488
1489
1490static int nilfs_segctor_collect(struct nilfs_sc_info *sci,
1491 struct the_nilfs *nilfs, int mode)
1492{
1493 struct nilfs_cstage prev_stage = sci->sc_stage;
1494 int err, nadd = 1;
1495
1496 /* Collection retry loop */
1497 for (;;) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001498 sci->sc_nblk_this_inc = 0;
1499 sci->sc_curseg = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
1500
1501 err = nilfs_segctor_reset_segment_buffer(sci);
1502 if (unlikely(err))
1503 goto failed;
1504
1505 err = nilfs_segctor_collect_blocks(sci, mode);
1506 sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks;
1507 if (!err)
1508 break;
1509
1510 if (unlikely(err != -E2BIG))
1511 goto failed;
1512
1513 /* The current segment is filled up */
Hitoshi Mitake58497702015-11-06 16:31:59 -08001514 if (mode != SC_LSEG_SR ||
1515 nilfs_sc_cstage_get(sci) < NILFS_ST_CPFILE)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001516 break;
1517
Ryusuke Konishi2d8428a2010-03-22 14:01:24 +09001518 nilfs_clear_logs(&sci->sc_segbufs);
1519
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +09001520 if (sci->sc_stage.flags & NILFS_CF_SUFREED) {
1521 err = nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1522 sci->sc_freesegs,
1523 sci->sc_nfreesegs,
1524 NULL);
1525 WARN_ON(err); /* do not happen */
Andreas Rohner70f2fe32014-01-14 17:56:36 -08001526 sci->sc_stage.flags &= ~NILFS_CF_SUFREED;
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +09001527 }
Andreas Rohner70f2fe32014-01-14 17:56:36 -08001528
1529 err = nilfs_segctor_extend_segments(sci, nilfs, nadd);
1530 if (unlikely(err))
1531 return err;
1532
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001533 nadd = min_t(int, nadd << 1, SC_MAX_SEGDELTA);
1534 sci->sc_stage = prev_stage;
1535 }
1536 nilfs_segctor_truncate_segments(sci, sci->sc_curseg, nilfs->ns_sufile);
1537 return 0;
1538
1539 failed:
1540 return err;
1541}
1542
1543static void nilfs_list_replace_buffer(struct buffer_head *old_bh,
1544 struct buffer_head *new_bh)
1545{
1546 BUG_ON(!list_empty(&new_bh->b_assoc_buffers));
1547
1548 list_replace_init(&old_bh->b_assoc_buffers, &new_bh->b_assoc_buffers);
1549 /* The caller must release old_bh */
1550}
1551
1552static int
1553nilfs_segctor_update_payload_blocknr(struct nilfs_sc_info *sci,
1554 struct nilfs_segment_buffer *segbuf,
1555 int mode)
1556{
1557 struct inode *inode = NULL;
1558 sector_t blocknr;
1559 unsigned long nfinfo = segbuf->sb_sum.nfinfo;
1560 unsigned long nblocks = 0, ndatablk = 0;
Julia Lawall1c613cb2016-05-23 16:22:57 -07001561 const struct nilfs_sc_operations *sc_op = NULL;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001562 struct nilfs_segsum_pointer ssp;
1563 struct nilfs_finfo *finfo = NULL;
1564 union nilfs_binfo binfo;
1565 struct buffer_head *bh, *bh_org;
1566 ino_t ino = 0;
1567 int err = 0;
1568
1569 if (!nfinfo)
1570 goto out;
1571
1572 blocknr = segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk;
1573 ssp.bh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers);
1574 ssp.offset = sizeof(struct nilfs_segment_summary);
1575
1576 list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) {
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +09001577 if (bh == segbuf->sb_super_root)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001578 break;
1579 if (!finfo) {
1580 finfo = nilfs_segctor_map_segsum_entry(
1581 sci, &ssp, sizeof(*finfo));
1582 ino = le64_to_cpu(finfo->fi_ino);
1583 nblocks = le32_to_cpu(finfo->fi_nblocks);
1584 ndatablk = le32_to_cpu(finfo->fi_ndatablk);
1585
Ryusuke Konishiaa405b12011-05-05 12:56:51 +09001586 inode = bh->b_page->mapping->host;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001587
1588 if (mode == SC_LSEG_DSYNC)
1589 sc_op = &nilfs_sc_dsync_ops;
1590 else if (ino == NILFS_DAT_INO)
1591 sc_op = &nilfs_sc_dat_ops;
1592 else /* file blocks */
1593 sc_op = &nilfs_sc_file_ops;
1594 }
1595 bh_org = bh;
1596 get_bh(bh_org);
1597 err = nilfs_bmap_assign(NILFS_I(inode)->i_bmap, &bh, blocknr,
1598 &binfo);
1599 if (bh != bh_org)
1600 nilfs_list_replace_buffer(bh_org, bh);
1601 brelse(bh_org);
1602 if (unlikely(err))
1603 goto failed_bmap;
1604
1605 if (ndatablk > 0)
1606 sc_op->write_data_binfo(sci, &ssp, &binfo);
1607 else
1608 sc_op->write_node_binfo(sci, &ssp, &binfo);
1609
1610 blocknr++;
1611 if (--nblocks == 0) {
1612 finfo = NULL;
1613 if (--nfinfo == 0)
1614 break;
1615 } else if (ndatablk > 0)
1616 ndatablk--;
1617 }
1618 out:
1619 return 0;
1620
1621 failed_bmap:
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001622 return err;
1623}
1624
1625static int nilfs_segctor_assign(struct nilfs_sc_info *sci, int mode)
1626{
1627 struct nilfs_segment_buffer *segbuf;
1628 int err;
1629
1630 list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
1631 err = nilfs_segctor_update_payload_blocknr(sci, segbuf, mode);
1632 if (unlikely(err))
1633 return err;
1634 nilfs_segbuf_fill_in_segsum(segbuf);
1635 }
1636 return 0;
1637}
1638
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001639static void nilfs_begin_page_io(struct page *page)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001640{
1641 if (!page || PageWriteback(page))
Ryusuke Konishi076a3782016-05-23 16:23:48 -07001642 /*
1643 * For split b-tree node pages, this function may be called
1644 * twice. We ignore the 2nd or later calls by this check.
1645 */
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001646 return;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001647
1648 lock_page(page);
1649 clear_page_dirty_for_io(page);
1650 set_page_writeback(page);
1651 unlock_page(page);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001652}
1653
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001654static void nilfs_segctor_prepare_write(struct nilfs_sc_info *sci)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001655{
1656 struct nilfs_segment_buffer *segbuf;
1657 struct page *bd_page = NULL, *fs_page = NULL;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001658
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001659 list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
1660 struct buffer_head *bh;
1661
1662 list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
1663 b_assoc_buffers) {
1664 if (bh->b_page != bd_page) {
1665 if (bd_page) {
1666 lock_page(bd_page);
1667 clear_page_dirty_for_io(bd_page);
1668 set_page_writeback(bd_page);
1669 unlock_page(bd_page);
1670 }
1671 bd_page = bh->b_page;
1672 }
1673 }
1674
1675 list_for_each_entry(bh, &segbuf->sb_payload_buffers,
1676 b_assoc_buffers) {
Vyacheslav Dubeyko7f42ec32013-09-30 13:45:12 -07001677 set_buffer_async_write(bh);
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +09001678 if (bh == segbuf->sb_super_root) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001679 if (bh->b_page != bd_page) {
1680 lock_page(bd_page);
1681 clear_page_dirty_for_io(bd_page);
1682 set_page_writeback(bd_page);
1683 unlock_page(bd_page);
1684 bd_page = bh->b_page;
1685 }
1686 break;
1687 }
1688 if (bh->b_page != fs_page) {
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001689 nilfs_begin_page_io(fs_page);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001690 fs_page = bh->b_page;
1691 }
1692 }
1693 }
1694 if (bd_page) {
1695 lock_page(bd_page);
1696 clear_page_dirty_for_io(bd_page);
1697 set_page_writeback(bd_page);
1698 unlock_page(bd_page);
1699 }
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001700 nilfs_begin_page_io(fs_page);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001701}
1702
1703static int nilfs_segctor_write(struct nilfs_sc_info *sci,
Ryusuke Konishi9c965ba2009-11-29 01:17:31 +09001704 struct the_nilfs *nilfs)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001705{
Ryusuke Konishid1c6b722009-12-17 00:55:40 +09001706 int ret;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001707
Ryusuke Konishid1c6b722009-12-17 00:55:40 +09001708 ret = nilfs_write_logs(&sci->sc_segbufs, nilfs);
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001709 list_splice_tail_init(&sci->sc_segbufs, &sci->sc_write_logs);
1710 return ret;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001711}
1712
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001713static void nilfs_end_page_io(struct page *page, int err)
1714{
1715 if (!page)
1716 return;
1717
Ryusuke Konishia9777842009-07-28 17:55:29 +09001718 if (buffer_nilfs_node(page_buffers(page)) && !PageWriteback(page)) {
Ryusuke Konishi8227b292009-06-18 23:52:23 +09001719 /*
1720 * For b-tree node pages, this function may be called twice
1721 * or more because they might be split in a segment.
1722 */
Ryusuke Konishia9777842009-07-28 17:55:29 +09001723 if (PageDirty(page)) {
1724 /*
1725 * For pages holding split b-tree node buffers, dirty
1726 * flag on the buffers may be cleared discretely.
1727 * In that case, the page is once redirtied for
1728 * remaining buffers, and it must be cancelled if
1729 * all the buffers get cleaned later.
1730 */
1731 lock_page(page);
1732 if (nilfs_page_buffers_clean(page))
1733 __nilfs_clear_page_dirty(page);
1734 unlock_page(page);
1735 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001736 return;
Ryusuke Konishia9777842009-07-28 17:55:29 +09001737 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001738
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001739 if (!err) {
1740 if (!nilfs_page_buffers_clean(page))
1741 __set_page_dirty_nobuffers(page);
1742 ClearPageError(page);
1743 } else {
1744 __set_page_dirty_nobuffers(page);
1745 SetPageError(page);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001746 }
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001747
1748 end_page_writeback(page);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001749}
1750
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001751static void nilfs_abort_logs(struct list_head *logs, int err)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001752{
1753 struct nilfs_segment_buffer *segbuf;
1754 struct page *bd_page = NULL, *fs_page = NULL;
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001755 struct buffer_head *bh;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001756
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001757 if (list_empty(logs))
1758 return;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001759
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001760 list_for_each_entry(segbuf, logs, sb_list) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001761 list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
1762 b_assoc_buffers) {
1763 if (bh->b_page != bd_page) {
1764 if (bd_page)
1765 end_page_writeback(bd_page);
1766 bd_page = bh->b_page;
1767 }
1768 }
1769
1770 list_for_each_entry(bh, &segbuf->sb_payload_buffers,
1771 b_assoc_buffers) {
Vyacheslav Dubeyko7f42ec32013-09-30 13:45:12 -07001772 clear_buffer_async_write(bh);
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +09001773 if (bh == segbuf->sb_super_root) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001774 if (bh->b_page != bd_page) {
1775 end_page_writeback(bd_page);
1776 bd_page = bh->b_page;
1777 }
1778 break;
1779 }
1780 if (bh->b_page != fs_page) {
1781 nilfs_end_page_io(fs_page, err);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001782 fs_page = bh->b_page;
1783 }
1784 }
1785 }
1786 if (bd_page)
1787 end_page_writeback(bd_page);
1788
1789 nilfs_end_page_io(fs_page, err);
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001790}
1791
1792static void nilfs_segctor_abort_construction(struct nilfs_sc_info *sci,
1793 struct the_nilfs *nilfs, int err)
1794{
1795 LIST_HEAD(logs);
1796 int ret;
1797
1798 list_splice_tail_init(&sci->sc_write_logs, &logs);
1799 ret = nilfs_wait_on_logs(&logs);
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09001800 nilfs_abort_logs(&logs, ret ? : err);
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001801
1802 list_splice_tail_init(&sci->sc_segbufs, &logs);
1803 nilfs_cancel_segusage(&logs, nilfs->ns_sufile);
1804 nilfs_free_incomplete_logs(&logs, nilfs);
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001805
1806 if (sci->sc_stage.flags & NILFS_CF_SUFREED) {
1807 ret = nilfs_sufile_cancel_freev(nilfs->ns_sufile,
1808 sci->sc_freesegs,
1809 sci->sc_nfreesegs,
1810 NULL);
1811 WARN_ON(ret); /* do not happen */
1812 }
1813
1814 nilfs_destroy_logs(&logs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001815}
1816
1817static void nilfs_set_next_segment(struct the_nilfs *nilfs,
1818 struct nilfs_segment_buffer *segbuf)
1819{
1820 nilfs->ns_segnum = segbuf->sb_segnum;
1821 nilfs->ns_nextnum = segbuf->sb_nextnum;
1822 nilfs->ns_pseg_offset = segbuf->sb_pseg_start - segbuf->sb_fseg_start
1823 + segbuf->sb_sum.nblocks;
1824 nilfs->ns_seg_seq = segbuf->sb_sum.seg_seq;
1825 nilfs->ns_ctime = segbuf->sb_sum.ctime;
1826}
1827
1828static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci)
1829{
1830 struct nilfs_segment_buffer *segbuf;
1831 struct page *bd_page = NULL, *fs_page = NULL;
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001832 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +09001833 int update_sr = false;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001834
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001835 list_for_each_entry(segbuf, &sci->sc_write_logs, sb_list) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001836 struct buffer_head *bh;
1837
1838 list_for_each_entry(bh, &segbuf->sb_segsum_buffers,
1839 b_assoc_buffers) {
1840 set_buffer_uptodate(bh);
1841 clear_buffer_dirty(bh);
1842 if (bh->b_page != bd_page) {
1843 if (bd_page)
1844 end_page_writeback(bd_page);
1845 bd_page = bh->b_page;
1846 }
1847 }
1848 /*
1849 * We assume that the buffers which belong to the same page
1850 * continue over the buffer list.
1851 * Under this assumption, the last BHs of pages is
1852 * identifiable by the discontinuity of bh->b_page
1853 * (page != fs_page).
1854 *
1855 * For B-tree node blocks, however, this assumption is not
1856 * guaranteed. The cleanup code of B-tree node pages needs
1857 * special care.
1858 */
1859 list_for_each_entry(bh, &segbuf->sb_payload_buffers,
1860 b_assoc_buffers) {
Ryusuke Konishi4ce5c342016-08-02 14:05:28 -07001861 const unsigned long set_bits = BIT(BH_Uptodate);
Ryusuke Konishiead8ecf2015-04-16 12:46:28 -07001862 const unsigned long clear_bits =
Ryusuke Konishi4ce5c342016-08-02 14:05:28 -07001863 (BIT(BH_Dirty) | BIT(BH_Async_Write) |
1864 BIT(BH_Delay) | BIT(BH_NILFS_Volatile) |
1865 BIT(BH_NILFS_Redirected));
Ryusuke Konishiead8ecf2015-04-16 12:46:28 -07001866
1867 set_mask_bits(&bh->b_state, clear_bits, set_bits);
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +09001868 if (bh == segbuf->sb_super_root) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001869 if (bh->b_page != bd_page) {
1870 end_page_writeback(bd_page);
1871 bd_page = bh->b_page;
1872 }
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +09001873 update_sr = true;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001874 break;
1875 }
1876 if (bh->b_page != fs_page) {
1877 nilfs_end_page_io(fs_page, 0);
1878 fs_page = bh->b_page;
1879 }
1880 }
1881
Ryusuke Konishi47620772010-05-23 21:48:36 +09001882 if (!nilfs_segbuf_simplex(segbuf)) {
1883 if (segbuf->sb_sum.flags & NILFS_SS_LOGBGN) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001884 set_bit(NILFS_SC_UNCLOSED, &sci->sc_flags);
1885 sci->sc_lseg_stime = jiffies;
1886 }
Ryusuke Konishi47620772010-05-23 21:48:36 +09001887 if (segbuf->sb_sum.flags & NILFS_SS_LOGEND)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001888 clear_bit(NILFS_SC_UNCLOSED, &sci->sc_flags);
1889 }
1890 }
1891 /*
1892 * Since pages may continue over multiple segment buffers,
1893 * end of the last page must be checked outside of the loop.
1894 */
1895 if (bd_page)
1896 end_page_writeback(bd_page);
1897
1898 nilfs_end_page_io(fs_page, 0);
1899
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001900 nilfs_drop_collected_inodes(&sci->sc_dirty_files);
1901
Ryusuke Konishic1c1d70922010-08-29 12:44:56 +09001902 if (nilfs_doing_gc())
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001903 nilfs_drop_collected_inodes(&sci->sc_gc_inodes);
Ryusuke Konishic1c1d70922010-08-29 12:44:56 +09001904 else
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001905 nilfs->ns_nongc_ctime = sci->sc_seg_ctime;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001906
1907 sci->sc_nblk_inc += sci->sc_nblk_this_inc;
1908
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001909 segbuf = NILFS_LAST_SEGBUF(&sci->sc_write_logs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001910 nilfs_set_next_segment(nilfs, segbuf);
1911
1912 if (update_sr) {
Andreas Rohnere2c76172014-10-13 15:53:20 -07001913 nilfs->ns_flushed_device = 0;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001914 nilfs_set_last_segment(nilfs, segbuf->sb_pseg_start,
Ryusuke Konishie339ad32009-04-06 19:01:59 -07001915 segbuf->sb_sum.seg_seq, nilfs->ns_cno++);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001916
Ryusuke Konishic96fa462009-04-06 19:01:57 -07001917 clear_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001918 clear_bit(NILFS_SC_DIRTY, &sci->sc_flags);
1919 set_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags);
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001920 nilfs_segctor_clear_metadata_dirty(sci);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001921 } else
1922 clear_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags);
1923}
1924
Ryusuke Konishia694291a2009-11-29 23:03:04 +09001925static int nilfs_segctor_wait(struct nilfs_sc_info *sci)
1926{
1927 int ret;
1928
1929 ret = nilfs_wait_on_logs(&sci->sc_write_logs);
1930 if (!ret) {
1931 nilfs_segctor_complete_write(sci);
1932 nilfs_destroy_logs(&sci->sc_write_logs);
1933 }
1934 return ret;
1935}
1936
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001937static int nilfs_segctor_collect_dirty_files(struct nilfs_sc_info *sci,
1938 struct the_nilfs *nilfs)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001939{
1940 struct nilfs_inode_info *ii, *n;
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001941 struct inode *ifile = sci->sc_root->ifile;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001942
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001943 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001944 retry:
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001945 list_for_each_entry_safe(ii, n, &nilfs->ns_dirty_files, i_dirty) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001946 if (!ii->i_bh) {
1947 struct buffer_head *ibh;
1948 int err;
1949
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001950 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001951 err = nilfs_ifile_get_inode_block(
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001952 ifile, ii->vfs_inode.i_ino, &ibh);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001953 if (unlikely(err)) {
Ryusuke Konishid6517de2016-08-02 14:05:14 -07001954 nilfs_msg(sci->sc_super, KERN_WARNING,
1955 "log writer: error %d getting inode block (ino=%lu)",
1956 err, ii->vfs_inode.i_ino);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001957 return err;
1958 }
Ryusuke Konishi5fc7b142011-05-05 12:56:51 +09001959 mark_buffer_dirty(ibh);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001960 nilfs_mdt_mark_dirty(ifile);
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001961 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001962 if (likely(!ii->i_bh))
1963 ii->i_bh = ibh;
1964 else
1965 brelse(ibh);
1966 goto retry;
1967 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001968
1969 clear_bit(NILFS_I_QUEUED, &ii->i_state);
1970 set_bit(NILFS_I_BUSY, &ii->i_state);
Nicolas Kaisereaae0f32011-03-19 16:45:30 +01001971 list_move_tail(&ii->i_dirty, &sci->sc_dirty_files);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001972 }
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001973 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001974
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001975 return 0;
1976}
1977
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001978static void nilfs_segctor_drop_written_files(struct nilfs_sc_info *sci,
1979 struct the_nilfs *nilfs)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001980{
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001981 struct nilfs_inode_info *ii, *n;
Ryusuke Konishi283ee1482015-03-12 16:26:00 -07001982 int during_mount = !(sci->sc_super->s_flags & MS_ACTIVE);
Ryusuke Konishi7ef3ff22015-02-05 12:25:20 -08001983 int defer_iput = false;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001984
Ryusuke Konishi693dd322011-03-09 11:05:07 +09001985 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001986 list_for_each_entry_safe(ii, n, &sci->sc_dirty_files, i_dirty) {
1987 if (!test_and_clear_bit(NILFS_I_UPDATED, &ii->i_state) ||
Ryusuke Konishi6c43f412010-08-20 20:10:38 +09001988 test_bit(NILFS_I_DIRTY, &ii->i_state))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001989 continue;
Ryusuke Konishi6c43f412010-08-20 20:10:38 +09001990
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07001991 clear_bit(NILFS_I_BUSY, &ii->i_state);
1992 brelse(ii->i_bh);
1993 ii->i_bh = NULL;
Ryusuke Konishi7ef3ff22015-02-05 12:25:20 -08001994 list_del_init(&ii->i_dirty);
Ryusuke Konishi283ee1482015-03-12 16:26:00 -07001995 if (!ii->vfs_inode.i_nlink || during_mount) {
Ryusuke Konishi7ef3ff22015-02-05 12:25:20 -08001996 /*
Ryusuke Konishi283ee1482015-03-12 16:26:00 -07001997 * Defer calling iput() to avoid deadlocks if
1998 * i_nlink == 0 or mount is not yet finished.
Ryusuke Konishi7ef3ff22015-02-05 12:25:20 -08001999 */
2000 list_add_tail(&ii->i_dirty, &sci->sc_iput_queue);
2001 defer_iput = true;
2002 } else {
2003 spin_unlock(&nilfs->ns_inode_lock);
2004 iput(&ii->vfs_inode);
2005 spin_lock(&nilfs->ns_inode_lock);
2006 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002007 }
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002008 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi7ef3ff22015-02-05 12:25:20 -08002009
2010 if (defer_iput)
2011 schedule_work(&sci->sc_iput_work);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002012}
2013
2014/*
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002015 * Main procedure of segment constructor
2016 */
2017static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
2018{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002019 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +09002020 int err;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002021
Hitoshi Mitake58497702015-11-06 16:31:59 -08002022 nilfs_sc_cstage_set(sci, NILFS_ST_INIT);
Ryusuke Konishi6c43f412010-08-20 20:10:38 +09002023 sci->sc_cno = nilfs->ns_cno;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002024
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002025 err = nilfs_segctor_collect_dirty_files(sci, nilfs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002026 if (unlikely(err))
2027 goto out;
2028
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09002029 if (nilfs_test_metadata_dirty(nilfs, sci->sc_root))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002030 set_bit(NILFS_SC_DIRTY, &sci->sc_flags);
2031
2032 if (nilfs_segctor_clean(sci))
2033 goto out;
2034
2035 do {
2036 sci->sc_stage.flags &= ~NILFS_CF_HISTORY_MASK;
2037
2038 err = nilfs_segctor_begin_construction(sci, nilfs);
2039 if (unlikely(err))
2040 goto out;
2041
2042 /* Update time stamp */
2043 sci->sc_seg_ctime = get_seconds();
2044
2045 err = nilfs_segctor_collect(sci, nilfs, mode);
2046 if (unlikely(err))
2047 goto failed;
2048
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002049 /* Avoid empty segment */
Hitoshi Mitake58497702015-11-06 16:31:59 -08002050 if (nilfs_sc_cstage_get(sci) == NILFS_ST_DONE &&
Ryusuke Konishi47620772010-05-23 21:48:36 +09002051 nilfs_segbuf_empty(sci->sc_curseg)) {
Ryusuke Konishia694291a2009-11-29 23:03:04 +09002052 nilfs_segctor_abort_construction(sci, nilfs, 1);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002053 goto out;
2054 }
2055
2056 err = nilfs_segctor_assign(sci, mode);
2057 if (unlikely(err))
2058 goto failed;
2059
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002060 if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09002061 nilfs_segctor_fill_in_file_bmap(sci);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002062
Ryusuke Konishi1e2b68b2010-03-23 01:15:31 +09002063 if (mode == SC_LSEG_SR &&
Hitoshi Mitake58497702015-11-06 16:31:59 -08002064 nilfs_sc_cstage_get(sci) >= NILFS_ST_CPFILE) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002065 err = nilfs_segctor_fill_in_checkpoint(sci);
2066 if (unlikely(err))
Ryusuke Konishia694291a2009-11-29 23:03:04 +09002067 goto failed_to_write;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002068
2069 nilfs_segctor_fill_in_super_root(sci, nilfs);
2070 }
2071 nilfs_segctor_update_segusage(sci, nilfs->ns_sufile);
2072
2073 /* Write partial segments */
Ryusuke Konishi1cb2d382011-04-04 12:53:28 +09002074 nilfs_segctor_prepare_write(sci);
Ryusuke Konishiaaed1d52010-03-23 01:50:38 +09002075
2076 nilfs_add_checksums_on_logs(&sci->sc_segbufs,
2077 nilfs->ns_crc_seed);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002078
Ryusuke Konishi9c965ba2009-11-29 01:17:31 +09002079 err = nilfs_segctor_write(sci, nilfs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002080 if (unlikely(err))
2081 goto failed_to_write;
2082
Hitoshi Mitake58497702015-11-06 16:31:59 -08002083 if (nilfs_sc_cstage_get(sci) == NILFS_ST_DONE ||
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +03002084 nilfs->ns_blocksize_bits != PAGE_SHIFT) {
Ryusuke Konishia694291a2009-11-29 23:03:04 +09002085 /*
2086 * At this point, we avoid double buffering
2087 * for blocksize < pagesize because page dirty
2088 * flag is turned off during write and dirty
2089 * buffers are not properly collected for
2090 * pages crossing over segments.
2091 */
2092 err = nilfs_segctor_wait(sci);
2093 if (err)
2094 goto failed_to_write;
2095 }
Hitoshi Mitake58497702015-11-06 16:31:59 -08002096 } while (nilfs_sc_cstage_get(sci) != NILFS_ST_DONE);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002097
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002098 out:
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002099 nilfs_segctor_drop_written_files(sci, nilfs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002100 return err;
2101
2102 failed_to_write:
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002103 if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
2104 nilfs_redirty_inodes(&sci->sc_dirty_files);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002105
2106 failed:
2107 if (nilfs_doing_gc())
2108 nilfs_redirty_inodes(&sci->sc_gc_inodes);
Ryusuke Konishia694291a2009-11-29 23:03:04 +09002109 nilfs_segctor_abort_construction(sci, nilfs, err);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002110 goto out;
2111}
2112
2113/**
Ryusuke Konishi9ccf56c2010-03-14 03:01:03 +09002114 * nilfs_segctor_start_timer - set timer of background write
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002115 * @sci: nilfs_sc_info
2116 *
2117 * If the timer has already been set, it ignores the new request.
2118 * This function MUST be called within a section locking the segment
2119 * semaphore.
2120 */
2121static void nilfs_segctor_start_timer(struct nilfs_sc_info *sci)
2122{
2123 spin_lock(&sci->sc_state_lock);
Li Hongfdce8952010-04-10 23:25:39 +08002124 if (!(sci->sc_state & NILFS_SEGCTOR_COMMIT)) {
2125 sci->sc_timer.expires = jiffies + sci->sc_interval;
2126 add_timer(&sci->sc_timer);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002127 sci->sc_state |= NILFS_SEGCTOR_COMMIT;
2128 }
2129 spin_unlock(&sci->sc_state_lock);
2130}
2131
2132static void nilfs_segctor_do_flush(struct nilfs_sc_info *sci, int bn)
2133{
2134 spin_lock(&sci->sc_state_lock);
Ryusuke Konishi4ce5c342016-08-02 14:05:28 -07002135 if (!(sci->sc_flush_request & BIT(bn))) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002136 unsigned long prev_req = sci->sc_flush_request;
2137
Ryusuke Konishi4ce5c342016-08-02 14:05:28 -07002138 sci->sc_flush_request |= BIT(bn);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002139 if (!prev_req)
2140 wake_up(&sci->sc_wait_daemon);
2141 }
2142 spin_unlock(&sci->sc_state_lock);
2143}
2144
2145/**
2146 * nilfs_flush_segment - trigger a segment construction for resource control
2147 * @sb: super block
2148 * @ino: inode number of the file to be flushed out.
2149 */
2150void nilfs_flush_segment(struct super_block *sb, ino_t ino)
2151{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002152 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002153 struct nilfs_sc_info *sci = nilfs->ns_writer;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002154
2155 if (!sci || nilfs_doing_construction())
2156 return;
2157 nilfs_segctor_do_flush(sci, NILFS_MDT_INODE(sb, ino) ? ino : 0);
2158 /* assign bit 0 to data files */
2159}
2160
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002161struct nilfs_segctor_wait_request {
2162 wait_queue_t wq;
2163 __u32 seq;
2164 int err;
2165 atomic_t done;
2166};
2167
2168static int nilfs_segctor_sync(struct nilfs_sc_info *sci)
2169{
2170 struct nilfs_segctor_wait_request wait_req;
2171 int err = 0;
2172
2173 spin_lock(&sci->sc_state_lock);
2174 init_wait(&wait_req.wq);
2175 wait_req.err = 0;
2176 atomic_set(&wait_req.done, 0);
2177 wait_req.seq = ++sci->sc_seq_request;
2178 spin_unlock(&sci->sc_state_lock);
2179
2180 init_waitqueue_entry(&wait_req.wq, current);
2181 add_wait_queue(&sci->sc_wait_request, &wait_req.wq);
2182 set_current_state(TASK_INTERRUPTIBLE);
2183 wake_up(&sci->sc_wait_daemon);
2184
2185 for (;;) {
2186 if (atomic_read(&wait_req.done)) {
2187 err = wait_req.err;
2188 break;
2189 }
2190 if (!signal_pending(current)) {
2191 schedule();
2192 continue;
2193 }
2194 err = -ERESTARTSYS;
2195 break;
2196 }
2197 finish_wait(&sci->sc_wait_request, &wait_req.wq);
2198 return err;
2199}
2200
2201static void nilfs_segctor_wakeup(struct nilfs_sc_info *sci, int err)
2202{
2203 struct nilfs_segctor_wait_request *wrq, *n;
2204 unsigned long flags;
2205
2206 spin_lock_irqsave(&sci->sc_wait_request.lock, flags);
2207 list_for_each_entry_safe(wrq, n, &sci->sc_wait_request.task_list,
2208 wq.task_list) {
2209 if (!atomic_read(&wrq->done) &&
2210 nilfs_cnt32_ge(sci->sc_seq_done, wrq->seq)) {
2211 wrq->err = err;
2212 atomic_set(&wrq->done, 1);
2213 }
2214 if (atomic_read(&wrq->done)) {
2215 wrq->wq.func(&wrq->wq,
2216 TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE,
2217 0, NULL);
2218 }
2219 }
2220 spin_unlock_irqrestore(&sci->sc_wait_request.lock, flags);
2221}
2222
2223/**
2224 * nilfs_construct_segment - construct a logical segment
2225 * @sb: super block
2226 *
2227 * Return Value: On success, 0 is retured. On errors, one of the following
2228 * negative error code is returned.
2229 *
2230 * %-EROFS - Read only filesystem.
2231 *
2232 * %-EIO - I/O error
2233 *
2234 * %-ENOSPC - No space left on device (only in a panic state).
2235 *
2236 * %-ERESTARTSYS - Interrupted.
2237 *
2238 * %-ENOMEM - Insufficient memory available.
2239 */
2240int nilfs_construct_segment(struct super_block *sb)
2241{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002242 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002243 struct nilfs_sc_info *sci = nilfs->ns_writer;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002244 struct nilfs_transaction_info *ti;
2245 int err;
2246
2247 if (!sci)
2248 return -EROFS;
2249
2250 /* A call inside transactions causes a deadlock. */
2251 BUG_ON((ti = current->journal_info) && ti->ti_magic == NILFS_TI_MAGIC);
2252
2253 err = nilfs_segctor_sync(sci);
2254 return err;
2255}
2256
2257/**
2258 * nilfs_construct_dsync_segment - construct a data-only logical segment
2259 * @sb: super block
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07002260 * @inode: inode whose data blocks should be written out
2261 * @start: start byte offset
2262 * @end: end byte offset (inclusive)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002263 *
2264 * Return Value: On success, 0 is retured. On errors, one of the following
2265 * negative error code is returned.
2266 *
2267 * %-EROFS - Read only filesystem.
2268 *
2269 * %-EIO - I/O error
2270 *
2271 * %-ENOSPC - No space left on device (only in a panic state).
2272 *
2273 * %-ERESTARTSYS - Interrupted.
2274 *
2275 * %-ENOMEM - Insufficient memory available.
2276 */
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07002277int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode,
2278 loff_t start, loff_t end)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002279{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002280 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002281 struct nilfs_sc_info *sci = nilfs->ns_writer;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002282 struct nilfs_inode_info *ii;
2283 struct nilfs_transaction_info ti;
2284 int err = 0;
2285
2286 if (!sci)
2287 return -EROFS;
2288
Ryusuke Konishif7545142011-03-09 11:05:08 +09002289 nilfs_transaction_lock(sb, &ti, 0);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002290
2291 ii = NILFS_I(inode);
Andreas Rohnerb9f66142014-10-13 15:53:22 -07002292 if (test_bit(NILFS_I_INODE_SYNC, &ii->i_state) ||
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09002293 nilfs_test_opt(nilfs, STRICT_ORDER) ||
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002294 test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) ||
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09002295 nilfs_discontinued(nilfs)) {
Ryusuke Konishif7545142011-03-09 11:05:08 +09002296 nilfs_transaction_unlock(sb);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002297 err = nilfs_segctor_sync(sci);
2298 return err;
2299 }
2300
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002301 spin_lock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002302 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
2303 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002304 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishif7545142011-03-09 11:05:08 +09002305 nilfs_transaction_unlock(sb);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002306 return 0;
2307 }
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002308 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -07002309 sci->sc_dsync_inode = ii;
2310 sci->sc_dsync_start = start;
2311 sci->sc_dsync_end = end;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002312
2313 err = nilfs_segctor_do_construct(sci, SC_LSEG_DSYNC);
Andreas Rohnere2c76172014-10-13 15:53:20 -07002314 if (!err)
2315 nilfs->ns_flushed_device = 0;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002316
Ryusuke Konishif7545142011-03-09 11:05:08 +09002317 nilfs_transaction_unlock(sb);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002318 return err;
2319}
2320
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002321#define FLUSH_FILE_BIT (0x1) /* data file only */
Ryusuke Konishi4ce5c342016-08-02 14:05:28 -07002322#define FLUSH_DAT_BIT BIT(NILFS_DAT_INO) /* DAT only */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002323
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002324/**
2325 * nilfs_segctor_accept - record accepted sequence count of log-write requests
2326 * @sci: segment constructor object
2327 */
2328static void nilfs_segctor_accept(struct nilfs_sc_info *sci)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002329{
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002330 spin_lock(&sci->sc_state_lock);
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002331 sci->sc_seq_accepted = sci->sc_seq_request;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002332 spin_unlock(&sci->sc_state_lock);
Li Hongfdce8952010-04-10 23:25:39 +08002333 del_timer_sync(&sci->sc_timer);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002334}
2335
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002336/**
2337 * nilfs_segctor_notify - notify the result of request to caller threads
2338 * @sci: segment constructor object
2339 * @mode: mode of log forming
2340 * @err: error code to be notified
2341 */
2342static void nilfs_segctor_notify(struct nilfs_sc_info *sci, int mode, int err)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002343{
2344 /* Clear requests (even when the construction failed) */
2345 spin_lock(&sci->sc_state_lock);
2346
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002347 if (mode == SC_LSEG_SR) {
Ryusuke Konishiaeda7f62009-11-02 15:08:13 +09002348 sci->sc_state &= ~NILFS_SEGCTOR_COMMIT;
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002349 sci->sc_seq_done = sci->sc_seq_accepted;
2350 nilfs_segctor_wakeup(sci, err);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002351 sci->sc_flush_request = 0;
Ryusuke Konishiaeda7f62009-11-02 15:08:13 +09002352 } else {
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002353 if (mode == SC_FLUSH_FILE)
Ryusuke Konishiaeda7f62009-11-02 15:08:13 +09002354 sci->sc_flush_request &= ~FLUSH_FILE_BIT;
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002355 else if (mode == SC_FLUSH_DAT)
Ryusuke Konishiaeda7f62009-11-02 15:08:13 +09002356 sci->sc_flush_request &= ~FLUSH_DAT_BIT;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002357
Ryusuke Konishiaeda7f62009-11-02 15:08:13 +09002358 /* re-enable timer if checkpoint creation was not done */
Li Hongfdce8952010-04-10 23:25:39 +08002359 if ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
2360 time_before(jiffies, sci->sc_timer.expires))
2361 add_timer(&sci->sc_timer);
Ryusuke Konishiaeda7f62009-11-02 15:08:13 +09002362 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002363 spin_unlock(&sci->sc_state_lock);
2364}
2365
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002366/**
2367 * nilfs_segctor_construct - form logs and write them to disk
2368 * @sci: segment constructor object
2369 * @mode: mode of log forming
2370 */
2371static int nilfs_segctor_construct(struct nilfs_sc_info *sci, int mode)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002372{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002373 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +09002374 struct nilfs_super_block **sbp;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002375 int err = 0;
2376
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002377 nilfs_segctor_accept(sci);
2378
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002379 if (nilfs_discontinued(nilfs))
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002380 mode = SC_LSEG_SR;
2381 if (!nilfs_segctor_confirm(sci))
2382 err = nilfs_segctor_do_construct(sci, mode);
2383
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002384 if (likely(!err)) {
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002385 if (mode != SC_FLUSH_DAT)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002386 atomic_set(&nilfs->ns_ndirtyblks, 0);
2387 if (test_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags) &&
2388 nilfs_discontinued(nilfs)) {
2389 down_write(&nilfs->ns_sem);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +09002390 err = -EIO;
Ryusuke Konishif7545142011-03-09 11:05:08 +09002391 sbp = nilfs_prepare_super(sci->sc_super,
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +09002392 nilfs_sb_will_flip(nilfs));
2393 if (likely(sbp)) {
2394 nilfs_set_log_cursor(sbp[0], nilfs);
Ryusuke Konishif7545142011-03-09 11:05:08 +09002395 err = nilfs_commit_super(sci->sc_super,
2396 NILFS_SB_COMMIT);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +09002397 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002398 up_write(&nilfs->ns_sem);
2399 }
2400 }
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002401
2402 nilfs_segctor_notify(sci, mode, err);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002403 return err;
2404}
2405
2406static void nilfs_construction_timeout(unsigned long data)
2407{
2408 struct task_struct *p = (struct task_struct *)data;
Ryusuke Konishi4ad364c2016-05-23 16:23:25 -07002409
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002410 wake_up_process(p);
2411}
2412
2413static void
2414nilfs_remove_written_gcinodes(struct the_nilfs *nilfs, struct list_head *head)
2415{
2416 struct nilfs_inode_info *ii, *n;
2417
2418 list_for_each_entry_safe(ii, n, head, i_dirty) {
2419 if (!test_bit(NILFS_I_UPDATED, &ii->i_state))
2420 continue;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002421 list_del_init(&ii->i_dirty);
Ryusuke Konishifbb24a32012-06-20 12:52:57 -07002422 truncate_inode_pages(&ii->vfs_inode.i_data, 0);
2423 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
Ryusuke Konishi263d90c2010-08-20 19:06:11 +09002424 iput(&ii->vfs_inode);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002425 }
2426}
2427
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +09002428int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv,
2429 void **kbufs)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002430{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002431 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002432 struct nilfs_sc_info *sci = nilfs->ns_writer;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002433 struct nilfs_transaction_info ti;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002434 int err;
2435
2436 if (unlikely(!sci))
2437 return -EROFS;
2438
Ryusuke Konishif7545142011-03-09 11:05:08 +09002439 nilfs_transaction_lock(sb, &ti, 1);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002440
Ryusuke Konishic1c1d70922010-08-29 12:44:56 +09002441 err = nilfs_mdt_save_to_shadow_map(nilfs->ns_dat);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002442 if (unlikely(err))
2443 goto out_unlock;
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +09002444
Ryusuke Konishi4f6b8282009-05-10 22:41:43 +09002445 err = nilfs_ioctl_prepare_clean_segments(nilfs, argv, kbufs);
Ryusuke Konishic1c1d70922010-08-29 12:44:56 +09002446 if (unlikely(err)) {
2447 nilfs_mdt_restore_from_shadow_map(nilfs->ns_dat);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002448 goto out_unlock;
Ryusuke Konishic1c1d70922010-08-29 12:44:56 +09002449 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002450
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +09002451 sci->sc_freesegs = kbufs[4];
2452 sci->sc_nfreesegs = argv[4].v_nmembs;
Ryusuke Konishi0935db72009-11-29 02:39:11 +09002453 list_splice_tail_init(&nilfs->ns_gc_inodes, &sci->sc_gc_inodes);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002454
2455 for (;;) {
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002456 err = nilfs_segctor_construct(sci, SC_LSEG_SR);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002457 nilfs_remove_written_gcinodes(nilfs, &sci->sc_gc_inodes);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002458
2459 if (likely(!err))
2460 break;
2461
Ryusuke Konishid6517de2016-08-02 14:05:14 -07002462 nilfs_msg(sb, KERN_WARNING, "error %d cleaning segments", err);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002463 set_current_state(TASK_INTERRUPTIBLE);
2464 schedule_timeout(sci->sc_interval);
2465 }
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09002466 if (nilfs_test_opt(nilfs, DISCARD)) {
Jiro SEKIBAe902ec92010-01-30 18:06:35 +09002467 int ret = nilfs_discard_segments(nilfs, sci->sc_freesegs,
2468 sci->sc_nfreesegs);
2469 if (ret) {
Ryusuke Konishifeee8802016-08-02 14:05:10 -07002470 nilfs_msg(sb, KERN_WARNING,
2471 "error %d on discard request, turning discards off for the device",
2472 ret);
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09002473 nilfs_clear_opt(nilfs, DISCARD);
Jiro SEKIBAe902ec92010-01-30 18:06:35 +09002474 }
2475 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002476
2477 out_unlock:
Ryusuke Konishi071cb4b2009-05-16 23:44:55 +09002478 sci->sc_freesegs = NULL;
2479 sci->sc_nfreesegs = 0;
Ryusuke Konishic1c1d70922010-08-29 12:44:56 +09002480 nilfs_mdt_clear_shadow_map(nilfs->ns_dat);
Ryusuke Konishif7545142011-03-09 11:05:08 +09002481 nilfs_transaction_unlock(sb);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002482 return err;
2483}
2484
2485static void nilfs_segctor_thread_construct(struct nilfs_sc_info *sci, int mode)
2486{
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002487 struct nilfs_transaction_info ti;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002488
Ryusuke Konishif7545142011-03-09 11:05:08 +09002489 nilfs_transaction_lock(sci->sc_super, &ti, 0);
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002490 nilfs_segctor_construct(sci, mode);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002491
2492 /*
2493 * Unclosed segment should be retried. We do this using sc_timer.
2494 * Timeout of sc_timer will invoke complete construction which leads
2495 * to close the current logical segment.
2496 */
2497 if (test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags))
2498 nilfs_segctor_start_timer(sci);
2499
Ryusuke Konishif7545142011-03-09 11:05:08 +09002500 nilfs_transaction_unlock(sci->sc_super);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002501}
2502
2503static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *sci)
2504{
2505 int mode = 0;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002506
2507 spin_lock(&sci->sc_state_lock);
2508 mode = (sci->sc_flush_request & FLUSH_DAT_BIT) ?
2509 SC_FLUSH_DAT : SC_FLUSH_FILE;
2510 spin_unlock(&sci->sc_state_lock);
2511
2512 if (mode) {
Ryusuke Konishi09ef29e2015-11-06 16:32:14 -08002513 nilfs_segctor_do_construct(sci, mode);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002514
2515 spin_lock(&sci->sc_state_lock);
2516 sci->sc_flush_request &= (mode == SC_FLUSH_FILE) ?
2517 ~FLUSH_FILE_BIT : ~FLUSH_DAT_BIT;
2518 spin_unlock(&sci->sc_state_lock);
2519 }
2520 clear_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags);
2521}
2522
2523static int nilfs_segctor_flush_mode(struct nilfs_sc_info *sci)
2524{
2525 if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) ||
2526 time_before(jiffies, sci->sc_lseg_stime + sci->sc_mjcp_freq)) {
2527 if (!(sci->sc_flush_request & ~FLUSH_FILE_BIT))
2528 return SC_FLUSH_FILE;
2529 else if (!(sci->sc_flush_request & ~FLUSH_DAT_BIT))
2530 return SC_FLUSH_DAT;
2531 }
2532 return SC_LSEG_SR;
2533}
2534
2535/**
2536 * nilfs_segctor_thread - main loop of the segment constructor thread.
2537 * @arg: pointer to a struct nilfs_sc_info.
2538 *
2539 * nilfs_segctor_thread() initializes a timer and serves as a daemon
2540 * to execute segment constructions.
2541 */
2542static int nilfs_segctor_thread(void *arg)
2543{
2544 struct nilfs_sc_info *sci = (struct nilfs_sc_info *)arg;
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002545 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002546 int timeout = 0;
2547
Li Hongfdce8952010-04-10 23:25:39 +08002548 sci->sc_timer.data = (unsigned long)current;
2549 sci->sc_timer.function = nilfs_construction_timeout;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002550
2551 /* start sync. */
2552 sci->sc_task = current;
2553 wake_up(&sci->sc_wait_task); /* for nilfs_segctor_start_thread() */
Ryusuke Konishifeee8802016-08-02 14:05:10 -07002554 nilfs_msg(sci->sc_super, KERN_INFO,
2555 "segctord starting. Construction interval = %lu seconds, CP frequency < %lu seconds",
2556 sci->sc_interval / HZ, sci->sc_mjcp_freq / HZ);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002557
2558 spin_lock(&sci->sc_state_lock);
2559 loop:
2560 for (;;) {
2561 int mode;
2562
2563 if (sci->sc_state & NILFS_SEGCTOR_QUIT)
2564 goto end_thread;
2565
2566 if (timeout || sci->sc_seq_request != sci->sc_seq_done)
2567 mode = SC_LSEG_SR;
Ryusuke Konishi7f001842016-05-23 16:23:42 -07002568 else if (sci->sc_flush_request)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002569 mode = nilfs_segctor_flush_mode(sci);
Ryusuke Konishi7f001842016-05-23 16:23:42 -07002570 else
2571 break;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002572
2573 spin_unlock(&sci->sc_state_lock);
2574 nilfs_segctor_thread_construct(sci, mode);
2575 spin_lock(&sci->sc_state_lock);
2576 timeout = 0;
2577 }
2578
2579
2580 if (freezing(current)) {
2581 spin_unlock(&sci->sc_state_lock);
Tejun Heoa0acae02011-11-21 12:32:22 -08002582 try_to_freeze();
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002583 spin_lock(&sci->sc_state_lock);
2584 } else {
2585 DEFINE_WAIT(wait);
2586 int should_sleep = 1;
2587
2588 prepare_to_wait(&sci->sc_wait_daemon, &wait,
2589 TASK_INTERRUPTIBLE);
2590
2591 if (sci->sc_seq_request != sci->sc_seq_done)
2592 should_sleep = 0;
2593 else if (sci->sc_flush_request)
2594 should_sleep = 0;
2595 else if (sci->sc_state & NILFS_SEGCTOR_COMMIT)
2596 should_sleep = time_before(jiffies,
Li Hongfdce8952010-04-10 23:25:39 +08002597 sci->sc_timer.expires);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002598
2599 if (should_sleep) {
2600 spin_unlock(&sci->sc_state_lock);
2601 schedule();
2602 spin_lock(&sci->sc_state_lock);
2603 }
2604 finish_wait(&sci->sc_wait_daemon, &wait);
2605 timeout = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) &&
Li Hongfdce8952010-04-10 23:25:39 +08002606 time_after_eq(jiffies, sci->sc_timer.expires));
Ryusuke Konishie605f0a2009-12-09 00:57:52 +09002607
2608 if (nilfs_sb_dirty(nilfs) && nilfs_sb_need_update(nilfs))
Jiro SEKIBA1dfa2712009-07-23 01:33:49 +09002609 set_nilfs_discontinued(nilfs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002610 }
2611 goto loop;
2612
2613 end_thread:
2614 spin_unlock(&sci->sc_state_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002615
2616 /* end sync. */
2617 sci->sc_task = NULL;
2618 wake_up(&sci->sc_wait_task); /* for nilfs_segctor_kill_thread() */
2619 return 0;
2620}
2621
2622static int nilfs_segctor_start_thread(struct nilfs_sc_info *sci)
2623{
2624 struct task_struct *t;
2625
2626 t = kthread_run(nilfs_segctor_thread, sci, "segctord");
2627 if (IS_ERR(t)) {
2628 int err = PTR_ERR(t);
2629
Ryusuke Konishifeee8802016-08-02 14:05:10 -07002630 nilfs_msg(sci->sc_super, KERN_ERR,
2631 "error %d creating segctord thread", err);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002632 return err;
2633 }
2634 wait_event(sci->sc_wait_task, sci->sc_task != NULL);
2635 return 0;
2636}
2637
2638static void nilfs_segctor_kill_thread(struct nilfs_sc_info *sci)
Jiro SEKIBA6b81e142010-10-14 13:52:00 +09002639 __acquires(&sci->sc_state_lock)
2640 __releases(&sci->sc_state_lock)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002641{
2642 sci->sc_state |= NILFS_SEGCTOR_QUIT;
2643
2644 while (sci->sc_task) {
2645 wake_up(&sci->sc_wait_daemon);
2646 spin_unlock(&sci->sc_state_lock);
2647 wait_event(sci->sc_wait_task, sci->sc_task == NULL);
2648 spin_lock(&sci->sc_state_lock);
2649 }
2650}
2651
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002652/*
2653 * Setup & clean-up functions
2654 */
Ryusuke Konishif7545142011-03-09 11:05:08 +09002655static struct nilfs_sc_info *nilfs_segctor_new(struct super_block *sb,
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09002656 struct nilfs_root *root)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002657{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002658 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002659 struct nilfs_sc_info *sci;
2660
2661 sci = kzalloc(sizeof(*sci), GFP_KERNEL);
2662 if (!sci)
2663 return NULL;
2664
Ryusuke Konishif7545142011-03-09 11:05:08 +09002665 sci->sc_super = sb;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002666
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09002667 nilfs_get_root(root);
2668 sci->sc_root = root;
2669
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002670 init_waitqueue_head(&sci->sc_wait_request);
2671 init_waitqueue_head(&sci->sc_wait_daemon);
2672 init_waitqueue_head(&sci->sc_wait_task);
2673 spin_lock_init(&sci->sc_state_lock);
2674 INIT_LIST_HEAD(&sci->sc_dirty_files);
2675 INIT_LIST_HEAD(&sci->sc_segbufs);
Ryusuke Konishia694291a2009-11-29 23:03:04 +09002676 INIT_LIST_HEAD(&sci->sc_write_logs);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002677 INIT_LIST_HEAD(&sci->sc_gc_inodes);
Ryusuke Konishi7ef3ff22015-02-05 12:25:20 -08002678 INIT_LIST_HEAD(&sci->sc_iput_queue);
2679 INIT_WORK(&sci->sc_iput_work, nilfs_iput_work_func);
Li Hongfdce8952010-04-10 23:25:39 +08002680 init_timer(&sci->sc_timer);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002681
2682 sci->sc_interval = HZ * NILFS_SC_DEFAULT_TIMEOUT;
2683 sci->sc_mjcp_freq = HZ * NILFS_SC_DEFAULT_SR_FREQ;
2684 sci->sc_watermark = NILFS_SC_DEFAULT_WATERMARK;
2685
Ryusuke Konishi574e6c32011-03-09 11:05:07 +09002686 if (nilfs->ns_interval)
Ryusuke Konishi071d73c2011-06-10 00:33:06 +09002687 sci->sc_interval = HZ * nilfs->ns_interval;
Ryusuke Konishi574e6c32011-03-09 11:05:07 +09002688 if (nilfs->ns_watermark)
2689 sci->sc_watermark = nilfs->ns_watermark;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002690 return sci;
2691}
2692
2693static void nilfs_segctor_write_out(struct nilfs_sc_info *sci)
2694{
2695 int ret, retrycount = NILFS_SC_CLEANUP_RETRY;
2696
Ryusuke Konishi076a3782016-05-23 16:23:48 -07002697 /*
2698 * The segctord thread was stopped and its timer was removed.
2699 * But some tasks remain.
2700 */
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002701 do {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002702 struct nilfs_transaction_info ti;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002703
Ryusuke Konishif7545142011-03-09 11:05:08 +09002704 nilfs_transaction_lock(sci->sc_super, &ti, 0);
Ryusuke Konishidcd76182010-01-26 15:20:15 +09002705 ret = nilfs_segctor_construct(sci, SC_LSEG_SR);
Ryusuke Konishif7545142011-03-09 11:05:08 +09002706 nilfs_transaction_unlock(sci->sc_super);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002707
Ryusuke Konishi7ef3ff22015-02-05 12:25:20 -08002708 flush_work(&sci->sc_iput_work);
2709
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002710 } while (ret && retrycount-- > 0);
2711}
2712
2713/**
2714 * nilfs_segctor_destroy - destroy the segment constructor.
2715 * @sci: nilfs_sc_info
2716 *
2717 * nilfs_segctor_destroy() kills the segctord thread and frees
2718 * the nilfs_sc_info struct.
2719 * Caller must hold the segment semaphore.
2720 */
2721static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
2722{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002723 struct the_nilfs *nilfs = sci->sc_super->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002724 int flag;
2725
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002726 up_write(&nilfs->ns_segctor_sem);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002727
2728 spin_lock(&sci->sc_state_lock);
2729 nilfs_segctor_kill_thread(sci);
2730 flag = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) || sci->sc_flush_request
2731 || sci->sc_seq_request != sci->sc_seq_done);
2732 spin_unlock(&sci->sc_state_lock);
2733
Ryusuke Konishi7ef3ff22015-02-05 12:25:20 -08002734 if (flush_work(&sci->sc_iput_work))
2735 flag = true;
2736
Ryusuke Konishi3256a052010-01-31 12:39:50 +09002737 if (flag || !nilfs_segctor_confirm(sci))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002738 nilfs_segctor_write_out(sci);
2739
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002740 if (!list_empty(&sci->sc_dirty_files)) {
Ryusuke Konishid6517de2016-08-02 14:05:14 -07002741 nilfs_msg(sci->sc_super, KERN_WARNING,
2742 "disposed unprocessed dirty file(s) when stopping log writer");
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002743 nilfs_dispose_list(nilfs, &sci->sc_dirty_files, 1);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002744 }
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002745
Ryusuke Konishi7ef3ff22015-02-05 12:25:20 -08002746 if (!list_empty(&sci->sc_iput_queue)) {
Ryusuke Konishid6517de2016-08-02 14:05:14 -07002747 nilfs_msg(sci->sc_super, KERN_WARNING,
2748 "disposed unprocessed inode(s) in iput queue when stopping log writer");
Ryusuke Konishi7ef3ff22015-02-05 12:25:20 -08002749 nilfs_dispose_list(nilfs, &sci->sc_iput_queue, 1);
2750 }
2751
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -07002752 WARN_ON(!list_empty(&sci->sc_segbufs));
Ryusuke Konishia694291a2009-11-29 23:03:04 +09002753 WARN_ON(!list_empty(&sci->sc_write_logs));
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002754
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09002755 nilfs_put_root(sci->sc_root);
2756
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002757 down_write(&nilfs->ns_segctor_sem);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002758
Li Hongfdce8952010-04-10 23:25:39 +08002759 del_timer_sync(&sci->sc_timer);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002760 kfree(sci);
2761}
2762
2763/**
Ryusuke Konishif7545142011-03-09 11:05:08 +09002764 * nilfs_attach_log_writer - attach log writer
2765 * @sb: super block instance
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09002766 * @root: root object of the current filesystem tree
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002767 *
Ryusuke Konishif7545142011-03-09 11:05:08 +09002768 * This allocates a log writer object, initializes it, and starts the
2769 * log writer.
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002770 *
2771 * Return Value: On success, 0 is returned. On error, one of the following
2772 * negative error code is returned.
2773 *
2774 * %-ENOMEM - Insufficient memory available.
2775 */
Ryusuke Konishif7545142011-03-09 11:05:08 +09002776int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002777{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002778 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002779 int err;
2780
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002781 if (nilfs->ns_writer) {
Ryusuke Konishife5f1712010-01-31 19:46:40 +09002782 /*
2783 * This happens if the filesystem was remounted
2784 * read/write after nilfs_error degenerated it into a
2785 * read-only mount.
2786 */
Ryusuke Konishif7545142011-03-09 11:05:08 +09002787 nilfs_detach_log_writer(sb);
Ryusuke Konishife5f1712010-01-31 19:46:40 +09002788 }
2789
Ryusuke Konishif7545142011-03-09 11:05:08 +09002790 nilfs->ns_writer = nilfs_segctor_new(sb, root);
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002791 if (!nilfs->ns_writer)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002792 return -ENOMEM;
2793
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002794 err = nilfs_segctor_start_thread(nilfs->ns_writer);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002795 if (err) {
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002796 kfree(nilfs->ns_writer);
2797 nilfs->ns_writer = NULL;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002798 }
2799 return err;
2800}
2801
2802/**
Ryusuke Konishif7545142011-03-09 11:05:08 +09002803 * nilfs_detach_log_writer - destroy log writer
2804 * @sb: super block instance
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002805 *
Ryusuke Konishif7545142011-03-09 11:05:08 +09002806 * This kills log writer daemon, frees the log writer object, and
2807 * destroys list of dirty files.
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002808 */
Ryusuke Konishif7545142011-03-09 11:05:08 +09002809void nilfs_detach_log_writer(struct super_block *sb)
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002810{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09002811 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002812 LIST_HEAD(garbage_list);
2813
2814 down_write(&nilfs->ns_segctor_sem);
Ryusuke Konishi3fd3fe52011-03-09 11:05:08 +09002815 if (nilfs->ns_writer) {
2816 nilfs_segctor_destroy(nilfs->ns_writer);
2817 nilfs->ns_writer = NULL;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002818 }
2819
2820 /* Force to free the list of dirty files */
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002821 spin_lock(&nilfs->ns_inode_lock);
2822 if (!list_empty(&nilfs->ns_dirty_files)) {
2823 list_splice_init(&nilfs->ns_dirty_files, &garbage_list);
Ryusuke Konishid6517de2016-08-02 14:05:14 -07002824 nilfs_msg(sb, KERN_WARNING,
2825 "disposed unprocessed dirty file(s) when detaching log writer");
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002826 }
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002827 spin_unlock(&nilfs->ns_inode_lock);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002828 up_write(&nilfs->ns_segctor_sem);
2829
Ryusuke Konishi693dd322011-03-09 11:05:07 +09002830 nilfs_dispose_list(nilfs, &garbage_list, 1);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -07002831}