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f2fs: remove uncovered code path
[deliverable/linux.git] / fs / f2fs / segment.c
CommitLineData
0a8165d7 1/*
351df4b2
JK		 2 * fs/f2fs/segment.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#include <linux/fs.h>
12#include <linux/f2fs_fs.h>
13#include <linux/bio.h>
14#include <linux/blkdev.h>
690e4a3e 15#include <linux/prefetch.h>
6b4afdd7 16#include <linux/kthread.h>
351df4b2 17#include <linux/vmalloc.h>
74de593a 18#include <linux/swap.h>
351df4b2
JK		 19
20#include "f2fs.h"
21#include "segment.h"
22#include "node.h"
9e4ded3f 23#include "trace.h"
6ec178da 24#include <trace/events/f2fs.h>
351df4b2 25
9a7f143a
CL		 26#define __reverse_ffz(x) __reverse_ffs(~(x))
27
7fd9e544 28static struct kmem_cache *discard_entry_slab;
184a5cd2 29static struct kmem_cache *sit_entry_set_slab;
88b88a66 30static struct kmem_cache *inmem_entry_slab;
7fd9e544 31
9a7f143a
CL		 32/*
33 * __reverse_ffs is copied from include/asm-generic/bitops/__ffs.h since
34 * MSB and LSB are reversed in a byte by f2fs_set_bit.
35 */
36static inline unsigned long __reverse_ffs(unsigned long word)
37{
38 int num = 0;
39
40#if BITS_PER_LONG == 64
41 if ((word & 0xffffffff) == 0) {
42 num += 32;
43 word >>= 32;
44 }
45#endif
46 if ((word & 0xffff) == 0) {
47 num += 16;
48 word >>= 16;
49 }
50 if ((word & 0xff) == 0) {
51 num += 8;
52 word >>= 8;
53 }
54 if ((word & 0xf0) == 0)
55 num += 4;
56 else
57 word >>= 4;
58 if ((word & 0xc) == 0)
59 num += 2;
60 else
61 word >>= 2;
62 if ((word & 0x2) == 0)
63 num += 1;
64 return num;
65}
66
67/*
e1c42045 68 * __find_rev_next(_zero)_bit is copied from lib/find_next_bit.c because
9a7f143a
CL		 69 * f2fs_set_bit makes MSB and LSB reversed in a byte.
70 * Example:
71 * LSB <--> MSB
72 * f2fs_set_bit(0, bitmap) => 0000 0001
73 * f2fs_set_bit(7, bitmap) => 1000 0000
74 */
75static unsigned long __find_rev_next_bit(const unsigned long *addr,
76 unsigned long size, unsigned long offset)
77{
78 const unsigned long *p = addr + BIT_WORD(offset);
79 unsigned long result = offset & ~(BITS_PER_LONG - 1);
80 unsigned long tmp;
81 unsigned long mask, submask;
82 unsigned long quot, rest;
83
84 if (offset >= size)
85 return size;
86
87 size -= result;
88 offset %= BITS_PER_LONG;
89 if (!offset)
90 goto aligned;
91
92 tmp = *(p++);
93 quot = (offset >> 3) << 3;
94 rest = offset & 0x7;
95 mask = ~0UL << quot;
96 submask = (unsigned char)(0xff << rest) >> rest;
97 submask <<= quot;
98 mask &= submask;
99 tmp &= mask;
100 if (size < BITS_PER_LONG)
101 goto found_first;
102 if (tmp)
103 goto found_middle;
104
105 size -= BITS_PER_LONG;
106 result += BITS_PER_LONG;
107aligned:
108 while (size & ~(BITS_PER_LONG-1)) {
109 tmp = *(p++);
110 if (tmp)
111 goto found_middle;
112 result += BITS_PER_LONG;
113 size -= BITS_PER_LONG;
114 }
115 if (!size)
116 return result;
117 tmp = *p;
118found_first:
119 tmp &= (~0UL >> (BITS_PER_LONG - size));
120 if (tmp == 0UL) /* Are any bits set? */
121 return result + size; /* Nope. */
122found_middle:
123 return result + __reverse_ffs(tmp);
124}
125
126static unsigned long __find_rev_next_zero_bit(const unsigned long *addr,
127 unsigned long size, unsigned long offset)
128{
129 const unsigned long *p = addr + BIT_WORD(offset);
130 unsigned long result = offset & ~(BITS_PER_LONG - 1);
131 unsigned long tmp;
132 unsigned long mask, submask;
133 unsigned long quot, rest;
134
135 if (offset >= size)
136 return size;
137
138 size -= result;
139 offset %= BITS_PER_LONG;
140 if (!offset)
141 goto aligned;
142
143 tmp = *(p++);
144 quot = (offset >> 3) << 3;
145 rest = offset & 0x7;
146 mask = ~(~0UL << quot);
147 submask = (unsigned char)~((unsigned char)(0xff << rest) >> rest);
148 submask <<= quot;
149 mask += submask;
150 tmp |= mask;
151 if (size < BITS_PER_LONG)
152 goto found_first;
153 if (~tmp)
154 goto found_middle;
155
156 size -= BITS_PER_LONG;
157 result += BITS_PER_LONG;
158aligned:
159 while (size & ~(BITS_PER_LONG - 1)) {
160 tmp = *(p++);
161 if (~tmp)
162 goto found_middle;
163 result += BITS_PER_LONG;
164 size -= BITS_PER_LONG;
165 }
166 if (!size)
167 return result;
168 tmp = *p;
169
170found_first:
171 tmp |= ~0UL << size;
172 if (tmp == ~0UL) /* Are any bits zero? */
173 return result + size; /* Nope. */
174found_middle:
175 return result + __reverse_ffz(tmp);
176}
177
88b88a66
JK		 178void register_inmem_page(struct inode *inode, struct page *page)
179{
180 struct f2fs_inode_info *fi = F2FS_I(inode);
181 struct inmem_pages *new;
34ba94ba 182 int err;
9be32d72 183
0722b101 184 SetPagePrivate(page);
9e4ded3f 185 f2fs_trace_pid(page);
0722b101 186
88b88a66
JK		 187 new = f2fs_kmem_cache_alloc(inmem_entry_slab, GFP_NOFS);
188
189 /* add atomic page indices to the list */
190 new->page = page;
191 INIT_LIST_HEAD(&new->list);
9be32d72 192retry:
88b88a66
JK		 193 /* increase reference count with clean state */
194 mutex_lock(&fi->inmem_lock);
34ba94ba
JK		 195 err = radix_tree_insert(&fi->inmem_root, page->index, new);
196 if (err == -EEXIST) {
197 mutex_unlock(&fi->inmem_lock);
198 kmem_cache_free(inmem_entry_slab, new);
199 return;
200 } else if (err) {
201 mutex_unlock(&fi->inmem_lock);
34ba94ba
JK		 202 goto retry;
203 }
88b88a66
JK		 204 get_page(page);
205 list_add_tail(&new->list, &fi->inmem_pages);
8dcf2ff7 206 inc_page_count(F2FS_I_SB(inode), F2FS_INMEM_PAGES);
88b88a66
JK		 207 mutex_unlock(&fi->inmem_lock);
208}
209
210void commit_inmem_pages(struct inode *inode, bool abort)
211{
212 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
213 struct f2fs_inode_info *fi = F2FS_I(inode);
214 struct inmem_pages *cur, *tmp;
215 bool submit_bio = false;
216 struct f2fs_io_info fio = {
217 .type = DATA,
1e84371f 218 .rw = WRITE_SYNC | REQ_PRIO,
88b88a66
JK		 219 };
220
0341845e
JK		 221 /*
222 * The abort is true only when f2fs_evict_inode is called.
223 * Basically, the f2fs_evict_inode doesn't produce any data writes, so
224 * that we don't need to call f2fs_balance_fs.
225 * Otherwise, f2fs_gc in f2fs_balance_fs can wait forever until this
226 * inode becomes free by iget_locked in f2fs_iget.
227 */
70c640b1 228 if (!abort) {
0341845e 229 f2fs_balance_fs(sbi);
70c640b1
JK		 230 f2fs_lock_op(sbi);
231 }
88b88a66
JK		 232
233 mutex_lock(&fi->inmem_lock);
234 list_for_each_entry_safe(cur, tmp, &fi->inmem_pages, list) {
70c640b1
JK		 235 if (!abort) {
236 lock_page(cur->page);
237 if (cur->page->mapping == inode->i_mapping) {
238 f2fs_wait_on_page_writeback(cur->page, DATA);
239 if (clear_page_dirty_for_io(cur->page))
240 inode_dec_dirty_pages(inode);
241 do_write_data_page(cur->page, &fio);
242 submit_bio = true;
243 }
244 f2fs_put_page(cur->page, 1);
245 } else {
246 put_page(cur->page);
88b88a66 247 }
34ba94ba 248 radix_tree_delete(&fi->inmem_root, cur->page->index);
88b88a66
JK		 249 list_del(&cur->list);
250 kmem_cache_free(inmem_entry_slab, cur);
8dcf2ff7 251 dec_page_count(F2FS_I_SB(inode), F2FS_INMEM_PAGES);
88b88a66 252 }
88b88a66
JK		 253 mutex_unlock(&fi->inmem_lock);
254
70c640b1
JK		 255 if (!abort) {
256 f2fs_unlock_op(sbi);
257 if (submit_bio)
258 f2fs_submit_merged_bio(sbi, DATA, WRITE);
259 }
88b88a66
JK		 260}
261
0a8165d7 262/*
351df4b2
JK		 263 * This function balances dirty node and dentry pages.
264 * In addition, it controls garbage collection.
265 */
266void f2fs_balance_fs(struct f2fs_sb_info *sbi)
267{
351df4b2 268 /*
029cd28c
JK		 269 * We should do GC or end up with checkpoint, if there are so many dirty
270 * dir/node pages without enough free segments.
351df4b2 271 */
43727527 272 if (has_not_enough_free_secs(sbi, 0)) {
351df4b2 273 mutex_lock(&sbi->gc_mutex);
408e9375 274 f2fs_gc(sbi);
351df4b2
JK		 275 }
276}
277
4660f9c0
JK		 278void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
279{
280 /* check the # of cached NAT entries and prefree segments */
281 if (try_to_free_nats(sbi, NAT_ENTRY_PER_BLOCK) ||
e5e7ea3c 282 excess_prefree_segs(sbi) ||
88a70a69 283 !available_free_memory(sbi, INO_ENTRIES))
4660f9c0
JK		 284 f2fs_sync_fs(sbi->sb, true);
285}
286
2163d198 287static int issue_flush_thread(void *data)
6b4afdd7
JK		 288{
289 struct f2fs_sb_info *sbi = data;
a688b9d9
GZ		 290 struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
291 wait_queue_head_t *q = &fcc->flush_wait_queue;
6b4afdd7
JK		 292repeat:
293 if (kthread_should_stop())
294 return 0;
295
721bd4d5 296 if (!llist_empty(&fcc->issue_list)) {
6b4afdd7
JK		 297 struct bio *bio = bio_alloc(GFP_NOIO, 0);
298 struct flush_cmd *cmd, *next;
299 int ret;
300
721bd4d5
GZ		 301 fcc->dispatch_list = llist_del_all(&fcc->issue_list);
302 fcc->dispatch_list = llist_reverse_order(fcc->dispatch_list);
303
6b4afdd7
JK		 304 bio->bi_bdev = sbi->sb->s_bdev;
305 ret = submit_bio_wait(WRITE_FLUSH, bio);
306
721bd4d5
GZ		 307 llist_for_each_entry_safe(cmd, next,
308 fcc->dispatch_list, llnode) {
6b4afdd7 309 cmd->ret = ret;
6b4afdd7
JK		 310 complete(&cmd->wait);
311 }
a4ed23f2 312 bio_put(bio);
a688b9d9 313 fcc->dispatch_list = NULL;
6b4afdd7
JK		 314 }
315
a688b9d9 316 wait_event_interruptible(*q,
721bd4d5 317 kthread_should_stop() || !llist_empty(&fcc->issue_list));
6b4afdd7
JK		 318 goto repeat;
319}
320
321int f2fs_issue_flush(struct f2fs_sb_info *sbi)
322{
a688b9d9 323 struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
adf8d90b 324 struct flush_cmd cmd;
6b4afdd7 325
24a9ee0f
JK		 326 trace_f2fs_issue_flush(sbi->sb, test_opt(sbi, NOBARRIER),
327 test_opt(sbi, FLUSH_MERGE));
328
0f7b2abd
JK		 329 if (test_opt(sbi, NOBARRIER))
330 return 0;
331
6b4afdd7
JK		 332 if (!test_opt(sbi, FLUSH_MERGE))
333 return blkdev_issue_flush(sbi->sb->s_bdev, GFP_KERNEL, NULL);
334
adf8d90b 335 init_completion(&cmd.wait);
6b4afdd7 336
721bd4d5 337 llist_add(&cmd.llnode, &fcc->issue_list);
6b4afdd7 338
a688b9d9
GZ		 339 if (!fcc->dispatch_list)
340 wake_up(&fcc->flush_wait_queue);
6b4afdd7 341
adf8d90b
CY		 342 wait_for_completion(&cmd.wait);
343
344 return cmd.ret;
6b4afdd7
JK		 345}
346
2163d198
GZ		 347int create_flush_cmd_control(struct f2fs_sb_info *sbi)
348{
349 dev_t dev = sbi->sb->s_bdev->bd_dev;
350 struct flush_cmd_control *fcc;
351 int err = 0;
352
353 fcc = kzalloc(sizeof(struct flush_cmd_control), GFP_KERNEL);
354 if (!fcc)
355 return -ENOMEM;
2163d198 356 init_waitqueue_head(&fcc->flush_wait_queue);
721bd4d5 357 init_llist_head(&fcc->issue_list);
6b2920a5 358 SM_I(sbi)->cmd_control_info = fcc;
2163d198
GZ		 359 fcc->f2fs_issue_flush = kthread_run(issue_flush_thread, sbi,
360 "f2fs_flush-%u:%u", MAJOR(dev), MINOR(dev));
361 if (IS_ERR(fcc->f2fs_issue_flush)) {
362 err = PTR_ERR(fcc->f2fs_issue_flush);
363 kfree(fcc);
6b2920a5 364 SM_I(sbi)->cmd_control_info = NULL;
2163d198
GZ		 365 return err;
366 }
2163d198
GZ		 367
368 return err;
369}
370
371void destroy_flush_cmd_control(struct f2fs_sb_info *sbi)
372{
6b2920a5 373 struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info;
2163d198
GZ		 374
375 if (fcc && fcc->f2fs_issue_flush)
376 kthread_stop(fcc->f2fs_issue_flush);
377 kfree(fcc);
6b2920a5 378 SM_I(sbi)->cmd_control_info = NULL;
2163d198
GZ		 379}
380
351df4b2
JK		 381static void __locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
382 enum dirty_type dirty_type)
383{
384 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
385
386 /* need not be added */
387 if (IS_CURSEG(sbi, segno))
388 return;
389
390 if (!test_and_set_bit(segno, dirty_i->dirty_segmap[dirty_type]))
391 dirty_i->nr_dirty[dirty_type]++;
392
393 if (dirty_type == DIRTY) {
394 struct seg_entry *sentry = get_seg_entry(sbi, segno);
4625d6aa 395 enum dirty_type t = sentry->type;
b2f2c390 396
ec325b52
JK		 397 if (unlikely(t >= DIRTY)) {
398 f2fs_bug_on(sbi, 1);
399 return;
400 }
4625d6aa
CL		 401 if (!test_and_set_bit(segno, dirty_i->dirty_segmap[t]))
402 dirty_i->nr_dirty[t]++;
351df4b2
JK		 403 }
404}
405
406static void __remove_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno,
407 enum dirty_type dirty_type)
408{
409 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
410
411 if (test_and_clear_bit(segno, dirty_i->dirty_segmap[dirty_type]))
412 dirty_i->nr_dirty[dirty_type]--;
413
414 if (dirty_type == DIRTY) {
4625d6aa
CL		 415 struct seg_entry *sentry = get_seg_entry(sbi, segno);
416 enum dirty_type t = sentry->type;
417
418 if (test_and_clear_bit(segno, dirty_i->dirty_segmap[t]))
419 dirty_i->nr_dirty[t]--;
b2f2c390 420
5ec4e49f
JK		 421 if (get_valid_blocks(sbi, segno, sbi->segs_per_sec) == 0)
422 clear_bit(GET_SECNO(sbi, segno),
423 dirty_i->victim_secmap);
351df4b2
JK		 424 }
425}
426
0a8165d7 427/*
351df4b2
JK		 428 * Should not occur error such as -ENOMEM.
429 * Adding dirty entry into seglist is not critical operation.
430 * If a given segment is one of current working segments, it won't be added.
431 */
8d8451af 432static void locate_dirty_segment(struct f2fs_sb_info *sbi, unsigned int segno)
351df4b2
JK		 433{
434 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
435 unsigned short valid_blocks;
436
437 if (segno == NULL_SEGNO || IS_CURSEG(sbi, segno))
438 return;
439
440 mutex_lock(&dirty_i->seglist_lock);
441
442 valid_blocks = get_valid_blocks(sbi, segno, 0);
443
444 if (valid_blocks == 0) {
445 __locate_dirty_segment(sbi, segno, PRE);
446 __remove_dirty_segment(sbi, segno, DIRTY);
447 } else if (valid_blocks < sbi->blocks_per_seg) {
448 __locate_dirty_segment(sbi, segno, DIRTY);
449 } else {
450 /* Recovery routine with SSR needs this */
451 __remove_dirty_segment(sbi, segno, DIRTY);
452 }
453
454 mutex_unlock(&dirty_i->seglist_lock);
351df4b2
JK		 455}
456
1e87a78d 457static int f2fs_issue_discard(struct f2fs_sb_info *sbi,
37208879
JK		 458 block_t blkstart, block_t blklen)
459{
55cf9cb6
CY		 460 sector_t start = SECTOR_FROM_BLOCK(blkstart);
461 sector_t len = SECTOR_FROM_BLOCK(blklen);
1661d07c 462 trace_f2fs_issue_discard(sbi->sb, blkstart, blklen);
1e87a78d
JK		 463 return blkdev_issue_discard(sbi->sb->s_bdev, start, len, GFP_NOFS, 0);
464}
465
cf2271e7 466void discard_next_dnode(struct f2fs_sb_info *sbi, block_t blkaddr)
1e87a78d 467{
1e87a78d
JK		 468 if (f2fs_issue_discard(sbi, blkaddr, 1)) {
469 struct page *page = grab_meta_page(sbi, blkaddr);
470 /* zero-filled page */
471 set_page_dirty(page);
472 f2fs_put_page(page, 1);
473 }
37208879
JK		 474}
475
adf4983b
JK		 476static void __add_discard_entry(struct f2fs_sb_info *sbi,
477 struct cp_control *cpc, unsigned int start, unsigned int end)
b2955550
JK		 478{
479 struct list_head *head = &SM_I(sbi)->discard_list;
adf4983b
JK		 480 struct discard_entry *new, *last;
481
482 if (!list_empty(head)) {
483 last = list_last_entry(head, struct discard_entry, list);
484 if (START_BLOCK(sbi, cpc->trim_start) + start ==
485 last->blkaddr + last->len) {
486 last->len += end - start;
487 goto done;
488 }
489 }
490
491 new = f2fs_kmem_cache_alloc(discard_entry_slab, GFP_NOFS);
492 INIT_LIST_HEAD(&new->list);
493 new->blkaddr = START_BLOCK(sbi, cpc->trim_start) + start;
494 new->len = end - start;
495 list_add_tail(&new->list, head);
496done:
497 SM_I(sbi)->nr_discards += end - start;
498 cpc->trimmed += end - start;
499}
500
501static void add_discard_addrs(struct f2fs_sb_info *sbi, struct cp_control *cpc)
502{
b2955550
JK		 503 int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
504 int max_blocks = sbi->blocks_per_seg;
4b2fecc8 505 struct seg_entry *se = get_seg_entry(sbi, cpc->trim_start);
b2955550
JK		 506 unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
507 unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
508 unsigned long dmap[entries];
509 unsigned int start = 0, end = -1;
4b2fecc8 510 bool force = (cpc->reason == CP_DISCARD);
b2955550
JK		 511 int i;
512
d7bc2484
JK		 513 if (!force && (!test_opt(sbi, DISCARD) ||
514 SM_I(sbi)->nr_discards >= SM_I(sbi)->max_discards))
b2955550
JK		 515 return;
516
4b2fecc8
JK		 517 if (force && !se->valid_blocks) {
518 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
519 /*
520 * if this segment is registered in the prefree list, then
521 * we should skip adding a discard candidate, and let the
522 * checkpoint do that later.
523 */
524 mutex_lock(&dirty_i->seglist_lock);
525 if (test_bit(cpc->trim_start, dirty_i->dirty_segmap[PRE])) {
526 mutex_unlock(&dirty_i->seglist_lock);
527 cpc->trimmed += sbi->blocks_per_seg;
528 return;
529 }
530 mutex_unlock(&dirty_i->seglist_lock);
531
adf4983b 532 __add_discard_entry(sbi, cpc, 0, sbi->blocks_per_seg);
4b2fecc8
JK		 533 return;
534 }
535
b2955550
JK		 536 /* zero block will be discarded through the prefree list */
537 if (!se->valid_blocks || se->valid_blocks == max_blocks)
538 return;
539
540 /* SIT_VBLOCK_MAP_SIZE should be multiple of sizeof(unsigned long) */
541 for (i = 0; i < entries; i++)
d7bc2484
JK		 542 dmap[i] = force ? ~ckpt_map[i] :
543 (cur_map[i] ^ ckpt_map[i]) & ckpt_map[i];
b2955550 544
4b2fecc8 545 while (force || SM_I(sbi)->nr_discards <= SM_I(sbi)->max_discards) {
b2955550
JK		 546 start = __find_rev_next_bit(dmap, max_blocks, end + 1);
547 if (start >= max_blocks)
548 break;
549
550 end = __find_rev_next_zero_bit(dmap, max_blocks, start + 1);
551
4b2fecc8
JK		 552 if (end - start < cpc->trim_minlen)
553 continue;
554
adf4983b 555 __add_discard_entry(sbi, cpc, start, end);
b2955550
JK		 556 }
557}
558
4b2fecc8
JK		 559void release_discard_addrs(struct f2fs_sb_info *sbi)
560{
561 struct list_head *head = &(SM_I(sbi)->discard_list);
562 struct discard_entry *entry, *this;
563
564 /* drop caches */
565 list_for_each_entry_safe(entry, this, head, list) {
566 list_del(&entry->list);
567 kmem_cache_free(discard_entry_slab, entry);
568 }
569}
570
0a8165d7 571/*
351df4b2
JK		 572 * Should call clear_prefree_segments after checkpoint is done.
573 */
574static void set_prefree_as_free_segments(struct f2fs_sb_info *sbi)
575{
576 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
b65ee148 577 unsigned int segno;
351df4b2
JK		 578
579 mutex_lock(&dirty_i->seglist_lock);
7cd8558b 580 for_each_set_bit(segno, dirty_i->dirty_segmap[PRE], MAIN_SEGS(sbi))
351df4b2 581 __set_test_and_free(sbi, segno);
351df4b2
JK		 582 mutex_unlock(&dirty_i->seglist_lock);
583}
584
585void clear_prefree_segments(struct f2fs_sb_info *sbi)
586{
b2955550 587 struct list_head *head = &(SM_I(sbi)->discard_list);
2d7b822a 588 struct discard_entry *entry, *this;
351df4b2 589 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
29e59c14 590 unsigned long *prefree_map = dirty_i->dirty_segmap[PRE];
29e59c14 591 unsigned int start = 0, end = -1;
351df4b2
JK		 592
593 mutex_lock(&dirty_i->seglist_lock);
29e59c14 594
351df4b2 595 while (1) {
29e59c14 596 int i;
7cd8558b
JK		 597 start = find_next_bit(prefree_map, MAIN_SEGS(sbi), end + 1);
598 if (start >= MAIN_SEGS(sbi))
351df4b2 599 break;
7cd8558b
JK		 600 end = find_next_zero_bit(prefree_map, MAIN_SEGS(sbi),
601 start + 1);
29e59c14
CL		 602
603 for (i = start; i < end; i++)
604 clear_bit(i, prefree_map);
605
606 dirty_i->nr_dirty[PRE] -= end - start;
607
608 if (!test_opt(sbi, DISCARD))
609 continue;
351df4b2 610
37208879
JK		 611 f2fs_issue_discard(sbi, START_BLOCK(sbi, start),
612 (end - start) << sbi->log_blocks_per_seg);
351df4b2
JK		 613 }
614 mutex_unlock(&dirty_i->seglist_lock);
b2955550
JK		 615
616 /* send small discards */
2d7b822a 617 list_for_each_entry_safe(entry, this, head, list) {
37208879 618 f2fs_issue_discard(sbi, entry->blkaddr, entry->len);
b2955550
JK		 619 list_del(&entry->list);
620 SM_I(sbi)->nr_discards -= entry->len;
621 kmem_cache_free(discard_entry_slab, entry);
622 }
351df4b2
JK		 623}
624
184a5cd2 625static bool __mark_sit_entry_dirty(struct f2fs_sb_info *sbi, unsigned int segno)
351df4b2
JK		 626{
627 struct sit_info *sit_i = SIT_I(sbi);
184a5cd2
CY		 628
629 if (!__test_and_set_bit(segno, sit_i->dirty_sentries_bitmap)) {
351df4b2 630 sit_i->dirty_sentries++;
184a5cd2
CY		 631 return false;
632 }
633
634 return true;
351df4b2
JK		 635}
636
637static void __set_sit_entry_type(struct f2fs_sb_info *sbi, int type,
638 unsigned int segno, int modified)
639{
640 struct seg_entry *se = get_seg_entry(sbi, segno);
641 se->type = type;
642 if (modified)
643 __mark_sit_entry_dirty(sbi, segno);
644}
645
646static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del)
647{
648 struct seg_entry *se;
649 unsigned int segno, offset;
650 long int new_vblocks;
651
652 segno = GET_SEGNO(sbi, blkaddr);
653
654 se = get_seg_entry(sbi, segno);
655 new_vblocks = se->valid_blocks + del;
491c0854 656 offset = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
351df4b2 657
9850cf4a 658 f2fs_bug_on(sbi, (new_vblocks >> (sizeof(unsigned short) << 3) ||
351df4b2
JK		 659 (new_vblocks > sbi->blocks_per_seg)));
660
661 se->valid_blocks = new_vblocks;
662 se->mtime = get_mtime(sbi);
663 SIT_I(sbi)->max_mtime = se->mtime;
664
665 /* Update valid block bitmap */
666 if (del > 0) {
52aca074 667 if (f2fs_test_and_set_bit(offset, se->cur_valid_map))
05796763 668 f2fs_bug_on(sbi, 1);
351df4b2 669 } else {
52aca074 670 if (!f2fs_test_and_clear_bit(offset, se->cur_valid_map))
05796763 671 f2fs_bug_on(sbi, 1);
351df4b2
JK		 672 }
673 if (!f2fs_test_bit(offset, se->ckpt_valid_map))
674 se->ckpt_valid_blocks += del;
675
676 __mark_sit_entry_dirty(sbi, segno);
677
678 /* update total number of valid blocks to be written in ckpt area */
679 SIT_I(sbi)->written_valid_blocks += del;
680
681 if (sbi->segs_per_sec > 1)
682 get_sec_entry(sbi, segno)->valid_blocks += del;
683}
684
5e443818 685void refresh_sit_entry(struct f2fs_sb_info *sbi, block_t old, block_t new)
351df4b2 686{
5e443818
JK		 687 update_sit_entry(sbi, new, 1);
688 if (GET_SEGNO(sbi, old) != NULL_SEGNO)
689 update_sit_entry(sbi, old, -1);
690
691 locate_dirty_segment(sbi, GET_SEGNO(sbi, old));
692 locate_dirty_segment(sbi, GET_SEGNO(sbi, new));
351df4b2
JK		 693}
694
695void invalidate_blocks(struct f2fs_sb_info *sbi, block_t addr)
696{
697 unsigned int segno = GET_SEGNO(sbi, addr);
698 struct sit_info *sit_i = SIT_I(sbi);
699
9850cf4a 700 f2fs_bug_on(sbi, addr == NULL_ADDR);
351df4b2
JK		 701 if (addr == NEW_ADDR)
702 return;
703
704 /* add it into sit main buffer */
705 mutex_lock(&sit_i->sentry_lock);
706
707 update_sit_entry(sbi, addr, -1);
708
709 /* add it into dirty seglist */
710 locate_dirty_segment(sbi, segno);
711
712 mutex_unlock(&sit_i->sentry_lock);
713}
714
0a8165d7 715/*
351df4b2
JK		 716 * This function should be resided under the curseg_mutex lock
717 */
718static void __add_sum_entry(struct f2fs_sb_info *sbi, int type,
e79efe3b 719 struct f2fs_summary *sum)
351df4b2
JK		 720{
721 struct curseg_info *curseg = CURSEG_I(sbi, type);
722 void *addr = curseg->sum_blk;
e79efe3b 723 addr += curseg->next_blkoff * sizeof(struct f2fs_summary);
351df4b2 724 memcpy(addr, sum, sizeof(struct f2fs_summary));
351df4b2
JK		 725}
726
0a8165d7 727/*
351df4b2
JK		 728 * Calculate the number of current summary pages for writing
729 */
3fa06d7b 730int npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra)
351df4b2 731{
351df4b2 732 int valid_sum_count = 0;
9a47938b 733 int i, sum_in_page;
351df4b2
JK		 734
735 for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
736 if (sbi->ckpt->alloc_type[i] == SSR)
737 valid_sum_count += sbi->blocks_per_seg;
3fa06d7b
CY		 738 else {
739 if (for_ra)
740 valid_sum_count += le16_to_cpu(
741 F2FS_CKPT(sbi)->cur_data_blkoff[i]);
742 else
743 valid_sum_count += curseg_blkoff(sbi, i);
744 }
351df4b2
JK		 745 }
746
9a47938b
FL		 747 sum_in_page = (PAGE_CACHE_SIZE - 2 * SUM_JOURNAL_SIZE -
748 SUM_FOOTER_SIZE) / SUMMARY_SIZE;
749 if (valid_sum_count <= sum_in_page)
351df4b2 750 return 1;
9a47938b
FL		 751 else if ((valid_sum_count - sum_in_page) <=
752 (PAGE_CACHE_SIZE - SUM_FOOTER_SIZE) / SUMMARY_SIZE)
351df4b2
JK		 753 return 2;
754 return 3;
755}
756
0a8165d7 757/*
351df4b2
JK		 758 * Caller should put this summary page
759 */
760struct page *get_sum_page(struct f2fs_sb_info *sbi, unsigned int segno)
761{
762 return get_meta_page(sbi, GET_SUM_BLOCK(sbi, segno));
763}
764
765static void write_sum_page(struct f2fs_sb_info *sbi,
766 struct f2fs_summary_block *sum_blk, block_t blk_addr)
767{
768 struct page *page = grab_meta_page(sbi, blk_addr);
769 void *kaddr = page_address(page);
770 memcpy(kaddr, sum_blk, PAGE_CACHE_SIZE);
771 set_page_dirty(page);
772 f2fs_put_page(page, 1);
773}
774
60374688
JK		 775static int is_next_segment_free(struct f2fs_sb_info *sbi, int type)
776{
777 struct curseg_info *curseg = CURSEG_I(sbi, type);
81fb5e87 778 unsigned int segno = curseg->segno + 1;
60374688
JK		 779 struct free_segmap_info *free_i = FREE_I(sbi);
780
7cd8558b 781 if (segno < MAIN_SEGS(sbi) && segno % sbi->segs_per_sec)
81fb5e87 782 return !test_bit(segno, free_i->free_segmap);
60374688
JK		 783 return 0;
784}
785
0a8165d7 786/*
351df4b2
JK		 787 * Find a new segment from the free segments bitmap to right order
788 * This function should be returned with success, otherwise BUG
789 */
790static void get_new_segment(struct f2fs_sb_info *sbi,
791 unsigned int *newseg, bool new_sec, int dir)
792{
793 struct free_segmap_info *free_i = FREE_I(sbi);
351df4b2 794 unsigned int segno, secno, zoneno;
7cd8558b 795 unsigned int total_zones = MAIN_SECS(sbi) / sbi->secs_per_zone;
351df4b2
JK		 796 unsigned int hint = *newseg / sbi->segs_per_sec;
797 unsigned int old_zoneno = GET_ZONENO_FROM_SEGNO(sbi, *newseg);
798 unsigned int left_start = hint;
799 bool init = true;
800 int go_left = 0;
801 int i;
802
803 write_lock(&free_i->segmap_lock);
804
805 if (!new_sec && ((*newseg + 1) % sbi->segs_per_sec)) {
806 segno = find_next_zero_bit(free_i->free_segmap,
7cd8558b 807 MAIN_SEGS(sbi), *newseg + 1);
33afa7fd
JK		 808 if (segno - *newseg < sbi->segs_per_sec -
809 (*newseg % sbi->segs_per_sec))
351df4b2
JK		 810 goto got_it;
811 }
812find_other_zone:
7cd8558b
JK		 813 secno = find_next_zero_bit(free_i->free_secmap, MAIN_SECS(sbi), hint);
814 if (secno >= MAIN_SECS(sbi)) {
351df4b2
JK		 815 if (dir == ALLOC_RIGHT) {
816 secno = find_next_zero_bit(free_i->free_secmap,
7cd8558b
JK		 817 MAIN_SECS(sbi), 0);
818 f2fs_bug_on(sbi, secno >= MAIN_SECS(sbi));
351df4b2
JK		 819 } else {
820 go_left = 1;
821 left_start = hint - 1;
822 }
823 }
824 if (go_left == 0)
825 goto skip_left;
826
827 while (test_bit(left_start, free_i->free_secmap)) {
828 if (left_start > 0) {
829 left_start--;
830 continue;
831 }
832 left_start = find_next_zero_bit(free_i->free_secmap,
7cd8558b
JK		 833 MAIN_SECS(sbi), 0);
834 f2fs_bug_on(sbi, left_start >= MAIN_SECS(sbi));
351df4b2
JK		 835 break;
836 }
837 secno = left_start;
838skip_left:
839 hint = secno;
840 segno = secno * sbi->segs_per_sec;
841 zoneno = secno / sbi->secs_per_zone;
842
843 /* give up on finding another zone */
844 if (!init)
845 goto got_it;
846 if (sbi->secs_per_zone == 1)
847 goto got_it;
848 if (zoneno == old_zoneno)
849 goto got_it;
850 if (dir == ALLOC_LEFT) {
851 if (!go_left && zoneno + 1 >= total_zones)
852 goto got_it;
853 if (go_left && zoneno == 0)
854 goto got_it;
855 }
856 for (i = 0; i < NR_CURSEG_TYPE; i++)
857 if (CURSEG_I(sbi, i)->zone == zoneno)
858 break;
859
860 if (i < NR_CURSEG_TYPE) {
861 /* zone is in user, try another */
862 if (go_left)
863 hint = zoneno * sbi->secs_per_zone - 1;
864 else if (zoneno + 1 >= total_zones)
865 hint = 0;
866 else
867 hint = (zoneno + 1) * sbi->secs_per_zone;
868 init = false;
869 goto find_other_zone;
870 }
871got_it:
872 /* set it as dirty segment in free segmap */
9850cf4a 873 f2fs_bug_on(sbi, test_bit(segno, free_i->free_segmap));
351df4b2
JK		 874 __set_inuse(sbi, segno);
875 *newseg = segno;
876 write_unlock(&free_i->segmap_lock);
877}
878
879static void reset_curseg(struct f2fs_sb_info *sbi, int type, int modified)
880{
881 struct curseg_info *curseg = CURSEG_I(sbi, type);
882 struct summary_footer *sum_footer;
883
884 curseg->segno = curseg->next_segno;
885 curseg->zone = GET_ZONENO_FROM_SEGNO(sbi, curseg->segno);
886 curseg->next_blkoff = 0;
887 curseg->next_segno = NULL_SEGNO;
888
889 sum_footer = &(curseg->sum_blk->footer);
890 memset(sum_footer, 0, sizeof(struct summary_footer));
891 if (IS_DATASEG(type))
892 SET_SUM_TYPE(sum_footer, SUM_TYPE_DATA);
893 if (IS_NODESEG(type))
894 SET_SUM_TYPE(sum_footer, SUM_TYPE_NODE);
895 __set_sit_entry_type(sbi, type, curseg->segno, modified);
896}
897
0a8165d7 898/*
351df4b2
JK		 899 * Allocate a current working segment.
900 * This function always allocates a free segment in LFS manner.
901 */
902static void new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
903{
904 struct curseg_info *curseg = CURSEG_I(sbi, type);
905 unsigned int segno = curseg->segno;
906 int dir = ALLOC_LEFT;
907
908 write_sum_page(sbi, curseg->sum_blk,
81fb5e87 909 GET_SUM_BLOCK(sbi, segno));
351df4b2
JK		 910 if (type == CURSEG_WARM_DATA || type == CURSEG_COLD_DATA)
911 dir = ALLOC_RIGHT;
912
913 if (test_opt(sbi, NOHEAP))
914 dir = ALLOC_RIGHT;
915
916 get_new_segment(sbi, &segno, new_sec, dir);
917 curseg->next_segno = segno;
918 reset_curseg(sbi, type, 1);
919 curseg->alloc_type = LFS;
920}
921
922static void __next_free_blkoff(struct f2fs_sb_info *sbi,
923 struct curseg_info *seg, block_t start)
924{
925 struct seg_entry *se = get_seg_entry(sbi, seg->segno);
e81c93cf
CL		 926 int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
927 unsigned long target_map[entries];
928 unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
929 unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
930 int i, pos;
931
932 for (i = 0; i < entries; i++)
933 target_map[i] = ckpt_map[i] | cur_map[i];
934
935 pos = __find_rev_next_zero_bit(target_map, sbi->blocks_per_seg, start);
936
937 seg->next_blkoff = pos;
351df4b2
JK		 938}
939
0a8165d7 940/*
351df4b2
JK		 941 * If a segment is written by LFS manner, next block offset is just obtained
942 * by increasing the current block offset. However, if a segment is written by
943 * SSR manner, next block offset obtained by calling __next_free_blkoff
944 */
945static void __refresh_next_blkoff(struct f2fs_sb_info *sbi,
946 struct curseg_info *seg)
947{
948 if (seg->alloc_type == SSR)
949 __next_free_blkoff(sbi, seg, seg->next_blkoff + 1);
950 else
951 seg->next_blkoff++;
952}
953
0a8165d7 954/*
e1c42045 955 * This function always allocates a used segment(from dirty seglist) by SSR
351df4b2
JK		 956 * manner, so it should recover the existing segment information of valid blocks
957 */
958static void change_curseg(struct f2fs_sb_info *sbi, int type, bool reuse)
959{
960 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
961 struct curseg_info *curseg = CURSEG_I(sbi, type);
962 unsigned int new_segno = curseg->next_segno;
963 struct f2fs_summary_block *sum_node;
964 struct page *sum_page;
965
966 write_sum_page(sbi, curseg->sum_blk,
967 GET_SUM_BLOCK(sbi, curseg->segno));
968 __set_test_and_inuse(sbi, new_segno);
969
970 mutex_lock(&dirty_i->seglist_lock);
971 __remove_dirty_segment(sbi, new_segno, PRE);
972 __remove_dirty_segment(sbi, new_segno, DIRTY);
973 mutex_unlock(&dirty_i->seglist_lock);
974
975 reset_curseg(sbi, type, 1);
976 curseg->alloc_type = SSR;
977 __next_free_blkoff(sbi, curseg, 0);
978
979 if (reuse) {
980 sum_page = get_sum_page(sbi, new_segno);
981 sum_node = (struct f2fs_summary_block *)page_address(sum_page);
982 memcpy(curseg->sum_blk, sum_node, SUM_ENTRY_SIZE);
983 f2fs_put_page(sum_page, 1);
984 }
985}
986
43727527
JK		 987static int get_ssr_segment(struct f2fs_sb_info *sbi, int type)
988{
989 struct curseg_info *curseg = CURSEG_I(sbi, type);
990 const struct victim_selection *v_ops = DIRTY_I(sbi)->v_ops;
991
992 if (IS_NODESEG(type) || !has_not_enough_free_secs(sbi, 0))
993 return v_ops->get_victim(sbi,
994 &(curseg)->next_segno, BG_GC, type, SSR);
995
996 /* For data segments, let's do SSR more intensively */
997 for (; type >= CURSEG_HOT_DATA; type--)
998 if (v_ops->get_victim(sbi, &(curseg)->next_segno,
999 BG_GC, type, SSR))
1000 return 1;
1001 return 0;
1002}
1003
351df4b2
JK		 1004/*
1005 * flush out current segment and replace it with new segment
1006 * This function should be returned with success, otherwise BUG
1007 */
1008static void allocate_segment_by_default(struct f2fs_sb_info *sbi,
1009 int type, bool force)
1010{
1011 struct curseg_info *curseg = CURSEG_I(sbi, type);
351df4b2 1012
7b405275 1013 if (force)
351df4b2 1014 new_curseg(sbi, type, true);
7b405275 1015 else if (type == CURSEG_WARM_NODE)
351df4b2 1016 new_curseg(sbi, type, false);
60374688
JK		 1017 else if (curseg->alloc_type == LFS && is_next_segment_free(sbi, type))
1018 new_curseg(sbi, type, false);
351df4b2
JK		 1019 else if (need_SSR(sbi) && get_ssr_segment(sbi, type))
1020 change_curseg(sbi, type, true);
1021 else
1022 new_curseg(sbi, type, false);
dcdfff65
JK		 1023
1024 stat_inc_seg_type(sbi, curseg);
351df4b2
JK		 1025}
1026
1027void allocate_new_segments(struct f2fs_sb_info *sbi)
1028{
1029 struct curseg_info *curseg;
1030 unsigned int old_curseg;
1031 int i;
1032
1033 for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
1034 curseg = CURSEG_I(sbi, i);
1035 old_curseg = curseg->segno;
1036 SIT_I(sbi)->s_ops->allocate_segment(sbi, i, true);
1037 locate_dirty_segment(sbi, old_curseg);
1038 }
1039}
1040
1041static const struct segment_allocation default_salloc_ops = {
1042 .allocate_segment = allocate_segment_by_default,
1043};
1044
4b2fecc8
JK		 1045int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
1046{
4b2fecc8
JK		 1047 __u64 start = range->start >> sbi->log_blocksize;
1048 __u64 end = start + (range->len >> sbi->log_blocksize) - 1;
4b2fecc8
JK		 1049 unsigned int start_segno, end_segno;
1050 struct cp_control cpc;
1051
7cd8558b
JK		 1052 if (range->minlen > SEGMENT_SIZE(sbi) || start >= MAX_BLKADDR(sbi) ||
1053 range->len < sbi->blocksize)
4b2fecc8
JK		 1054 return -EINVAL;
1055
9bd27ae4 1056 cpc.trimmed = 0;
7cd8558b 1057 if (end <= MAIN_BLKADDR(sbi))
4b2fecc8
JK		 1058 goto out;
1059
1060 /* start/end segment number in main_area */
7cd8558b
JK		 1061 start_segno = (start <= MAIN_BLKADDR(sbi)) ? 0 : GET_SEGNO(sbi, start);
1062 end_segno = (end >= MAX_BLKADDR(sbi)) ? MAIN_SEGS(sbi) - 1 :
1063 GET_SEGNO(sbi, end);
4b2fecc8
JK		 1064 cpc.reason = CP_DISCARD;
1065 cpc.trim_start = start_segno;
1066 cpc.trim_end = end_segno;
1067 cpc.trim_minlen = range->minlen >> sbi->log_blocksize;
4b2fecc8
JK		 1068
1069 /* do checkpoint to issue discard commands safely */
ca4b02ee 1070 mutex_lock(&sbi->gc_mutex);
4b2fecc8 1071 write_checkpoint(sbi, &cpc);
ca4b02ee 1072 mutex_unlock(&sbi->gc_mutex);
4b2fecc8
JK		 1073out:
1074 range->len = cpc.trimmed << sbi->log_blocksize;
1075 return 0;
1076}
1077
351df4b2
JK		 1078static bool __has_curseg_space(struct f2fs_sb_info *sbi, int type)
1079{
1080 struct curseg_info *curseg = CURSEG_I(sbi, type);
1081 if (curseg->next_blkoff < sbi->blocks_per_seg)
1082 return true;
1083 return false;
1084}
1085
1086static int __get_segment_type_2(struct page *page, enum page_type p_type)
1087{
1088 if (p_type == DATA)
1089 return CURSEG_HOT_DATA;
1090 else
1091 return CURSEG_HOT_NODE;
1092}
1093
1094static int __get_segment_type_4(struct page *page, enum page_type p_type)
1095{
1096 if (p_type == DATA) {
1097 struct inode *inode = page->mapping->host;
1098
1099 if (S_ISDIR(inode->i_mode))
1100 return CURSEG_HOT_DATA;
1101 else
1102 return CURSEG_COLD_DATA;
1103 } else {
a344b9fd
JK		 1104 if (IS_DNODE(page) && is_cold_node(page))
1105 return CURSEG_WARM_NODE;
351df4b2
JK		 1106 else
1107 return CURSEG_COLD_NODE;
1108 }
1109}
1110
1111static int __get_segment_type_6(struct page *page, enum page_type p_type)
1112{
1113 if (p_type == DATA) {
1114 struct inode *inode = page->mapping->host;
1115
1116 if (S_ISDIR(inode->i_mode))
1117 return CURSEG_HOT_DATA;
354a3399 1118 else if (is_cold_data(page) || file_is_cold(inode))
351df4b2
JK		 1119 return CURSEG_COLD_DATA;
1120 else
1121 return CURSEG_WARM_DATA;
1122 } else {
1123 if (IS_DNODE(page))
1124 return is_cold_node(page) ? CURSEG_WARM_NODE :
1125 CURSEG_HOT_NODE;
1126 else
1127 return CURSEG_COLD_NODE;
1128 }
1129}
1130
1131static int __get_segment_type(struct page *page, enum page_type p_type)
1132{
4081363f 1133 switch (F2FS_P_SB(page)->active_logs) {
351df4b2
JK		 1134 case 2:
1135 return __get_segment_type_2(page, p_type);
1136 case 4:
1137 return __get_segment_type_4(page, p_type);
351df4b2 1138 }
12a67146 1139 /* NR_CURSEG_TYPE(6) logs by default */
9850cf4a
JK		 1140 f2fs_bug_on(F2FS_P_SB(page),
1141 F2FS_P_SB(page)->active_logs != NR_CURSEG_TYPE);
12a67146 1142 return __get_segment_type_6(page, p_type);
351df4b2
JK		 1143}
1144
bfad7c2d
JK		 1145void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
1146 block_t old_blkaddr, block_t *new_blkaddr,
1147 struct f2fs_summary *sum, int type)
351df4b2
JK		 1148{
1149 struct sit_info *sit_i = SIT_I(sbi);
1150 struct curseg_info *curseg;
351df4b2 1151
351df4b2
JK		 1152 curseg = CURSEG_I(sbi, type);
1153
1154 mutex_lock(&curseg->curseg_mutex);
1155
1156 *new_blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
351df4b2
JK		 1157
1158 /*
1159 * __add_sum_entry should be resided under the curseg_mutex
1160 * because, this function updates a summary entry in the
1161 * current summary block.
1162 */
e79efe3b 1163 __add_sum_entry(sbi, type, sum);
351df4b2
JK		 1164
1165 mutex_lock(&sit_i->sentry_lock);
1166 __refresh_next_blkoff(sbi, curseg);
dcdfff65
JK		 1167
1168 stat_inc_block_count(sbi, curseg);
351df4b2 1169
5e443818
JK		 1170 if (!__has_curseg_space(sbi, type))
1171 sit_i->s_ops->allocate_segment(sbi, type, false);
351df4b2
JK		 1172 /*
1173 * SIT information should be updated before segment allocation,
1174 * since SSR needs latest valid block information.
1175 */
1176 refresh_sit_entry(sbi, old_blkaddr, *new_blkaddr);
5e443818 1177
351df4b2
JK		 1178 mutex_unlock(&sit_i->sentry_lock);
1179
bfad7c2d 1180 if (page && IS_NODESEG(type))
351df4b2
JK		 1181 fill_node_footer_blkaddr(page, NEXT_FREE_BLKADDR(sbi, curseg));
1182
bfad7c2d
JK		 1183 mutex_unlock(&curseg->curseg_mutex);
1184}
1185
1186static void do_write_page(struct f2fs_sb_info *sbi, struct page *page,
cf04e8eb
JK		 1187 struct f2fs_summary *sum,
1188 struct f2fs_io_info *fio)
bfad7c2d
JK		 1189{
1190 int type = __get_segment_type(page, fio->type);
1191
cf04e8eb 1192 allocate_data_block(sbi, page, fio->blk_addr, &fio->blk_addr, sum, type);
bfad7c2d 1193
351df4b2 1194 /* writeout dirty page into bdev */
cf04e8eb 1195 f2fs_submit_page_mbio(sbi, page, fio);
351df4b2
JK		 1196}
1197
577e3495 1198void write_meta_page(struct f2fs_sb_info *sbi, struct page *page)
351df4b2 1199{
458e6197
JK		 1200 struct f2fs_io_info fio = {
1201 .type = META,
cf04e8eb
JK		 1202 .rw = WRITE_SYNC | REQ_META | REQ_PRIO,
1203 .blk_addr = page->index,
458e6197
JK		 1204 };
1205
351df4b2 1206 set_page_writeback(page);
cf04e8eb 1207 f2fs_submit_page_mbio(sbi, page, &fio);
351df4b2
JK		 1208}
1209
1210void write_node_page(struct f2fs_sb_info *sbi, struct page *page,
cf04e8eb 1211 unsigned int nid, struct f2fs_io_info *fio)
351df4b2
JK		 1212{
1213 struct f2fs_summary sum;
1214 set_summary(&sum, nid, 0, 0);
cf04e8eb 1215 do_write_page(sbi, page, &sum, fio);
351df4b2
JK		 1216}
1217
458e6197 1218void write_data_page(struct page *page, struct dnode_of_data *dn,
cf04e8eb 1219 struct f2fs_io_info *fio)
351df4b2 1220{
4081363f 1221 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
351df4b2
JK		 1222 struct f2fs_summary sum;
1223 struct node_info ni;
1224
9850cf4a 1225 f2fs_bug_on(sbi, dn->data_blkaddr == NULL_ADDR);
351df4b2
JK		 1226 get_node_info(sbi, dn->nid, &ni);
1227 set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
cf04e8eb 1228 do_write_page(sbi, page, &sum, fio);
e1509cf2 1229 dn->data_blkaddr = fio->blk_addr;
351df4b2
JK		 1230}
1231
cf04e8eb 1232void rewrite_data_page(struct page *page, struct f2fs_io_info *fio)
351df4b2 1233{
b9a2c252 1234 stat_inc_inplace_blocks(F2FS_P_SB(page));
cf04e8eb 1235 f2fs_submit_page_mbio(F2FS_P_SB(page), page, fio);
351df4b2
JK		 1236}
1237
1238void recover_data_page(struct f2fs_sb_info *sbi,
1239 struct page *page, struct f2fs_summary *sum,
1240 block_t old_blkaddr, block_t new_blkaddr)
1241{
1242 struct sit_info *sit_i = SIT_I(sbi);
1243 struct curseg_info *curseg;
1244 unsigned int segno, old_cursegno;
1245 struct seg_entry *se;
1246 int type;
1247
1248 segno = GET_SEGNO(sbi, new_blkaddr);
1249 se = get_seg_entry(sbi, segno);
1250 type = se->type;
1251
1252 if (se->valid_blocks == 0 && !IS_CURSEG(sbi, segno)) {
1253 if (old_blkaddr == NULL_ADDR)
1254 type = CURSEG_COLD_DATA;
1255 else
1256 type = CURSEG_WARM_DATA;
1257 }
1258 curseg = CURSEG_I(sbi, type);
1259
1260 mutex_lock(&curseg->curseg_mutex);
1261 mutex_lock(&sit_i->sentry_lock);
1262
1263 old_cursegno = curseg->segno;
1264
1265 /* change the current segment */
1266 if (segno != curseg->segno) {
1267 curseg->next_segno = segno;
1268 change_curseg(sbi, type, true);
1269 }
1270
491c0854 1271 curseg->next_blkoff = GET_BLKOFF_FROM_SEG0(sbi, new_blkaddr);
e79efe3b 1272 __add_sum_entry(sbi, type, sum);
351df4b2
JK		 1273
1274 refresh_sit_entry(sbi, old_blkaddr, new_blkaddr);
351df4b2 1275 locate_dirty_segment(sbi, old_cursegno);
351df4b2
JK		 1276
1277 mutex_unlock(&sit_i->sentry_lock);
1278 mutex_unlock(&curseg->curseg_mutex);
1279}
1280
df0f8dc0
CY		 1281static inline bool is_merged_page(struct f2fs_sb_info *sbi,
1282 struct page *page, enum page_type type)
1283{
1284 enum page_type btype = PAGE_TYPE_OF_BIO(type);
1285 struct f2fs_bio_info *io = &sbi->write_io[btype];
df0f8dc0
CY		 1286 struct bio_vec *bvec;
1287 int i;
1288
1289 down_read(&io->io_rwsem);
ce23447f 1290 if (!io->bio)
df0f8dc0
CY		 1291 goto out;
1292
ce23447f 1293 bio_for_each_segment_all(bvec, io->bio, i) {
df0f8dc0
CY		 1294 if (page == bvec->bv_page) {
1295 up_read(&io->io_rwsem);
1296 return true;
1297 }
1298 }
1299
1300out:
1301 up_read(&io->io_rwsem);
1302 return false;
1303}
1304
93dfe2ac 1305void f2fs_wait_on_page_writeback(struct page *page,
5514f0aa 1306 enum page_type type)
93dfe2ac 1307{
93dfe2ac 1308 if (PageWriteback(page)) {
4081363f
JK		 1309 struct f2fs_sb_info *sbi = F2FS_P_SB(page);
1310
df0f8dc0
CY		 1311 if (is_merged_page(sbi, page, type))
1312 f2fs_submit_merged_bio(sbi, type, WRITE);
93dfe2ac
JK		 1313 wait_on_page_writeback(page);
1314 }
1315}
1316
351df4b2
JK		 1317static int read_compacted_summaries(struct f2fs_sb_info *sbi)
1318{
1319 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1320 struct curseg_info *seg_i;
1321 unsigned char *kaddr;
1322 struct page *page;
1323 block_t start;
1324 int i, j, offset;
1325
1326 start = start_sum_block(sbi);
1327
1328 page = get_meta_page(sbi, start++);
1329 kaddr = (unsigned char *)page_address(page);
1330
1331 /* Step 1: restore nat cache */
1332 seg_i = CURSEG_I(sbi, CURSEG_HOT_DATA);
1333 memcpy(&seg_i->sum_blk->n_nats, kaddr, SUM_JOURNAL_SIZE);
1334
1335 /* Step 2: restore sit cache */
1336 seg_i = CURSEG_I(sbi, CURSEG_COLD_DATA);
1337 memcpy(&seg_i->sum_blk->n_sits, kaddr + SUM_JOURNAL_SIZE,
1338 SUM_JOURNAL_SIZE);
1339 offset = 2 * SUM_JOURNAL_SIZE;
1340
1341 /* Step 3: restore summary entries */
1342 for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
1343 unsigned short blk_off;
1344 unsigned int segno;
1345
1346 seg_i = CURSEG_I(sbi, i);
1347 segno = le32_to_cpu(ckpt->cur_data_segno[i]);
1348 blk_off = le16_to_cpu(ckpt->cur_data_blkoff[i]);
1349 seg_i->next_segno = segno;
1350 reset_curseg(sbi, i, 0);
1351 seg_i->alloc_type = ckpt->alloc_type[i];
1352 seg_i->next_blkoff = blk_off;
1353
1354 if (seg_i->alloc_type == SSR)
1355 blk_off = sbi->blocks_per_seg;
1356
1357 for (j = 0; j < blk_off; j++) {
1358 struct f2fs_summary *s;
1359 s = (struct f2fs_summary *)(kaddr + offset);
1360 seg_i->sum_blk->entries[j] = *s;
1361 offset += SUMMARY_SIZE;
1362 if (offset + SUMMARY_SIZE <= PAGE_CACHE_SIZE -
1363 SUM_FOOTER_SIZE)
1364 continue;
1365
1366 f2fs_put_page(page, 1);
1367 page = NULL;
1368
1369 page = get_meta_page(sbi, start++);
1370 kaddr = (unsigned char *)page_address(page);
1371 offset = 0;
1372 }
1373 }
1374 f2fs_put_page(page, 1);
1375 return 0;
1376}
1377
1378static int read_normal_summaries(struct f2fs_sb_info *sbi, int type)
1379{
1380 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1381 struct f2fs_summary_block *sum;
1382 struct curseg_info *curseg;
1383 struct page *new;
1384 unsigned short blk_off;
1385 unsigned int segno = 0;
1386 block_t blk_addr = 0;
1387
1388 /* get segment number and block addr */
1389 if (IS_DATASEG(type)) {
1390 segno = le32_to_cpu(ckpt->cur_data_segno[type]);
1391 blk_off = le16_to_cpu(ckpt->cur_data_blkoff[type -
1392 CURSEG_HOT_DATA]);
25ca923b 1393 if (is_set_ckpt_flags(ckpt, CP_UMOUNT_FLAG))
351df4b2
JK		 1394 blk_addr = sum_blk_addr(sbi, NR_CURSEG_TYPE, type);
1395 else
1396 blk_addr = sum_blk_addr(sbi, NR_CURSEG_DATA_TYPE, type);
1397 } else {
1398 segno = le32_to_cpu(ckpt->cur_node_segno[type -
1399 CURSEG_HOT_NODE]);
1400 blk_off = le16_to_cpu(ckpt->cur_node_blkoff[type -
1401 CURSEG_HOT_NODE]);
25ca923b 1402 if (is_set_ckpt_flags(ckpt, CP_UMOUNT_FLAG))
351df4b2
JK		 1403 blk_addr = sum_blk_addr(sbi, NR_CURSEG_NODE_TYPE,
1404 type - CURSEG_HOT_NODE);
1405 else
1406 blk_addr = GET_SUM_BLOCK(sbi, segno);
1407 }
1408
1409 new = get_meta_page(sbi, blk_addr);
1410 sum = (struct f2fs_summary_block *)page_address(new);
1411
1412 if (IS_NODESEG(type)) {
25ca923b 1413 if (is_set_ckpt_flags(ckpt, CP_UMOUNT_FLAG)) {
351df4b2
JK		 1414 struct f2fs_summary *ns = &sum->entries[0];
1415 int i;
1416 for (i = 0; i < sbi->blocks_per_seg; i++, ns++) {
1417 ns->version = 0;
1418 ns->ofs_in_node = 0;
1419 }
1420 } else {
d653788a
GZ		 1421 int err;
1422
1423 err = restore_node_summary(sbi, segno, sum);
1424 if (err) {
351df4b2 1425 f2fs_put_page(new, 1);
d653788a 1426 return err;
351df4b2
JK		 1427 }
1428 }
1429 }
1430
1431 /* set uncompleted segment to curseg */
1432 curseg = CURSEG_I(sbi, type);
1433 mutex_lock(&curseg->curseg_mutex);
1434 memcpy(curseg->sum_blk, sum, PAGE_CACHE_SIZE);
1435 curseg->next_segno = segno;
1436 reset_curseg(sbi, type, 0);
1437 curseg->alloc_type = ckpt->alloc_type[type];
1438 curseg->next_blkoff = blk_off;
1439 mutex_unlock(&curseg->curseg_mutex);
1440 f2fs_put_page(new, 1);
1441 return 0;
1442}
1443
1444static int restore_curseg_summaries(struct f2fs_sb_info *sbi)
1445{
1446 int type = CURSEG_HOT_DATA;
e4fc5fbf 1447 int err;
351df4b2 1448
25ca923b 1449 if (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_COMPACT_SUM_FLAG)) {
3fa06d7b
CY		 1450 int npages = npages_for_summary_flush(sbi, true);
1451
1452 if (npages >= 2)
1453 ra_meta_pages(sbi, start_sum_block(sbi), npages,
1454 META_CP);
1455
351df4b2
JK		 1456 /* restore for compacted data summary */
1457 if (read_compacted_summaries(sbi))
1458 return -EINVAL;
1459 type = CURSEG_HOT_NODE;
1460 }
1461
3fa06d7b
CY		 1462 if (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG))
1463 ra_meta_pages(sbi, sum_blk_addr(sbi, NR_CURSEG_TYPE, type),
1464 NR_CURSEG_TYPE - type, META_CP);
1465
e4fc5fbf
CY		 1466 for (; type <= CURSEG_COLD_NODE; type++) {
1467 err = read_normal_summaries(sbi, type);
1468 if (err)
1469 return err;
1470 }
1471
351df4b2
JK		 1472 return 0;
1473}
1474
1475static void write_compacted_summaries(struct f2fs_sb_info *sbi, block_t blkaddr)
1476{
1477 struct page *page;
1478 unsigned char *kaddr;
1479 struct f2fs_summary *summary;
1480 struct curseg_info *seg_i;
1481 int written_size = 0;
1482 int i, j;
1483
1484 page = grab_meta_page(sbi, blkaddr++);
1485 kaddr = (unsigned char *)page_address(page);
1486
1487 /* Step 1: write nat cache */
1488 seg_i = CURSEG_I(sbi, CURSEG_HOT_DATA);
1489 memcpy(kaddr, &seg_i->sum_blk->n_nats, SUM_JOURNAL_SIZE);
1490 written_size += SUM_JOURNAL_SIZE;
1491
1492 /* Step 2: write sit cache */
1493 seg_i = CURSEG_I(sbi, CURSEG_COLD_DATA);
1494 memcpy(kaddr + written_size, &seg_i->sum_blk->n_sits,
1495 SUM_JOURNAL_SIZE);
1496 written_size += SUM_JOURNAL_SIZE;
1497
351df4b2
JK		 1498 /* Step 3: write summary entries */
1499 for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
1500 unsigned short blkoff;
1501 seg_i = CURSEG_I(sbi, i);
1502 if (sbi->ckpt->alloc_type[i] == SSR)
1503 blkoff = sbi->blocks_per_seg;
1504 else
1505 blkoff = curseg_blkoff(sbi, i);
1506
1507 for (j = 0; j < blkoff; j++) {
1508 if (!page) {
1509 page = grab_meta_page(sbi, blkaddr++);
1510 kaddr = (unsigned char *)page_address(page);
1511 written_size = 0;
1512 }
1513 summary = (struct f2fs_summary *)(kaddr + written_size);
1514 *summary = seg_i->sum_blk->entries[j];
1515 written_size += SUMMARY_SIZE;
351df4b2
JK		 1516
1517 if (written_size + SUMMARY_SIZE <= PAGE_CACHE_SIZE -
1518 SUM_FOOTER_SIZE)
1519 continue;
1520
e8d61a74 1521 set_page_dirty(page);
351df4b2
JK		 1522 f2fs_put_page(page, 1);
1523 page = NULL;
1524 }
1525 }
e8d61a74
CY		 1526 if (page) {
1527 set_page_dirty(page);
351df4b2 1528 f2fs_put_page(page, 1);
e8d61a74 1529 }
351df4b2
JK		 1530}
1531
1532static void write_normal_summaries(struct f2fs_sb_info *sbi,
1533 block_t blkaddr, int type)
1534{
1535 int i, end;
1536 if (IS_DATASEG(type))
1537 end = type + NR_CURSEG_DATA_TYPE;
1538 else
1539 end = type + NR_CURSEG_NODE_TYPE;
1540
1541 for (i = type; i < end; i++) {
1542 struct curseg_info *sum = CURSEG_I(sbi, i);
1543 mutex_lock(&sum->curseg_mutex);
1544 write_sum_page(sbi, sum->sum_blk, blkaddr + (i - type));
1545 mutex_unlock(&sum->curseg_mutex);
1546 }
1547}
1548
1549void write_data_summaries(struct f2fs_sb_info *sbi, block_t start_blk)
1550{
25ca923b 1551 if (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_COMPACT_SUM_FLAG))
351df4b2
JK		 1552 write_compacted_summaries(sbi, start_blk);
1553 else
1554 write_normal_summaries(sbi, start_blk, CURSEG_HOT_DATA);
1555}
1556
1557void write_node_summaries(struct f2fs_sb_info *sbi, block_t start_blk)
1558{
25ca923b 1559 if (is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG))
351df4b2 1560 write_normal_summaries(sbi, start_blk, CURSEG_HOT_NODE);
351df4b2
JK		 1561}
1562
1563int lookup_journal_in_cursum(struct f2fs_summary_block *sum, int type,
1564 unsigned int val, int alloc)
1565{
1566 int i;
1567
1568 if (type == NAT_JOURNAL) {
1569 for (i = 0; i < nats_in_cursum(sum); i++) {
1570 if (le32_to_cpu(nid_in_journal(sum, i)) == val)
1571 return i;
1572 }
1573 if (alloc && nats_in_cursum(sum) < NAT_JOURNAL_ENTRIES)
1574 return update_nats_in_cursum(sum, 1);
1575 } else if (type == SIT_JOURNAL) {
1576 for (i = 0; i < sits_in_cursum(sum); i++)
1577 if (le32_to_cpu(segno_in_journal(sum, i)) == val)
1578 return i;
1579 if (alloc && sits_in_cursum(sum) < SIT_JOURNAL_ENTRIES)
1580 return update_sits_in_cursum(sum, 1);
1581 }
1582 return -1;
1583}
1584
1585static struct page *get_current_sit_page(struct f2fs_sb_info *sbi,
1586 unsigned int segno)
1587{
2cc22186 1588 return get_meta_page(sbi, current_sit_addr(sbi, segno));
351df4b2
JK		 1589}
1590
1591static struct page *get_next_sit_page(struct f2fs_sb_info *sbi,
1592 unsigned int start)
1593{
1594 struct sit_info *sit_i = SIT_I(sbi);
1595 struct page *src_page, *dst_page;
1596 pgoff_t src_off, dst_off;
1597 void *src_addr, *dst_addr;
1598
1599 src_off = current_sit_addr(sbi, start);
1600 dst_off = next_sit_addr(sbi, src_off);
1601
1602 /* get current sit block page without lock */
1603 src_page = get_meta_page(sbi, src_off);
1604 dst_page = grab_meta_page(sbi, dst_off);
9850cf4a 1605 f2fs_bug_on(sbi, PageDirty(src_page));
351df4b2
JK		 1606
1607 src_addr = page_address(src_page);
1608 dst_addr = page_address(dst_page);
1609 memcpy(dst_addr, src_addr, PAGE_CACHE_SIZE);
1610
1611 set_page_dirty(dst_page);
1612 f2fs_put_page(src_page, 1);
1613
1614 set_to_next_sit(sit_i, start);
1615
1616 return dst_page;
1617}
1618
184a5cd2
CY		 1619static struct sit_entry_set *grab_sit_entry_set(void)
1620{
1621 struct sit_entry_set *ses =
1622 f2fs_kmem_cache_alloc(sit_entry_set_slab, GFP_ATOMIC);
1623
1624 ses->entry_cnt = 0;
1625 INIT_LIST_HEAD(&ses->set_list);
1626 return ses;
1627}
1628
1629static void release_sit_entry_set(struct sit_entry_set *ses)
1630{
1631 list_del(&ses->set_list);
1632 kmem_cache_free(sit_entry_set_slab, ses);
1633}
1634
1635static void adjust_sit_entry_set(struct sit_entry_set *ses,
1636 struct list_head *head)
1637{
1638 struct sit_entry_set *next = ses;
1639
1640 if (list_is_last(&ses->set_list, head))
1641 return;
1642
1643 list_for_each_entry_continue(next, head, set_list)
1644 if (ses->entry_cnt <= next->entry_cnt)
1645 break;
1646
1647 list_move_tail(&ses->set_list, &next->set_list);
1648}
1649
1650static void add_sit_entry(unsigned int segno, struct list_head *head)
1651{
1652 struct sit_entry_set *ses;
1653 unsigned int start_segno = START_SEGNO(segno);
1654
1655 list_for_each_entry(ses, head, set_list) {
1656 if (ses->start_segno == start_segno) {
1657 ses->entry_cnt++;
1658 adjust_sit_entry_set(ses, head);
1659 return;
1660 }
1661 }
1662
1663 ses = grab_sit_entry_set();
1664
1665 ses->start_segno = start_segno;
1666 ses->entry_cnt++;
1667 list_add(&ses->set_list, head);
1668}
1669
1670static void add_sits_in_set(struct f2fs_sb_info *sbi)
1671{
1672 struct f2fs_sm_info *sm_info = SM_I(sbi);
1673 struct list_head *set_list = &sm_info->sit_entry_set;
1674 unsigned long *bitmap = SIT_I(sbi)->dirty_sentries_bitmap;
184a5cd2
CY		 1675 unsigned int segno;
1676
7cd8558b 1677 for_each_set_bit(segno, bitmap, MAIN_SEGS(sbi))
184a5cd2
CY		 1678 add_sit_entry(segno, set_list);
1679}
1680
1681static void remove_sits_in_journal(struct f2fs_sb_info *sbi)
351df4b2
JK		 1682{
1683 struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
1684 struct f2fs_summary_block *sum = curseg->sum_blk;
1685 int i;
1686
184a5cd2
CY		 1687 for (i = sits_in_cursum(sum) - 1; i >= 0; i--) {
1688 unsigned int segno;
1689 bool dirtied;
1690
1691 segno = le32_to_cpu(segno_in_journal(sum, i));
1692 dirtied = __mark_sit_entry_dirty(sbi, segno);
1693
1694 if (!dirtied)
1695 add_sit_entry(segno, &SM_I(sbi)->sit_entry_set);
351df4b2 1696 }
184a5cd2 1697 update_sits_in_cursum(sum, -sits_in_cursum(sum));
351df4b2
JK		 1698}
1699
0a8165d7 1700/*
351df4b2
JK		 1701 * CP calls this function, which flushes SIT entries including sit_journal,
1702 * and moves prefree segs to free segs.
1703 */
4b2fecc8 1704void flush_sit_entries(struct f2fs_sb_info *sbi, struct cp_control *cpc)
351df4b2
JK		 1705{
1706 struct sit_info *sit_i = SIT_I(sbi);
1707 unsigned long *bitmap = sit_i->dirty_sentries_bitmap;
1708 struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
1709 struct f2fs_summary_block *sum = curseg->sum_blk;
184a5cd2
CY		 1710 struct sit_entry_set *ses, *tmp;
1711 struct list_head *head = &SM_I(sbi)->sit_entry_set;
184a5cd2 1712 bool to_journal = true;
4b2fecc8 1713 struct seg_entry *se;
351df4b2
JK		 1714
1715 mutex_lock(&curseg->curseg_mutex);
1716 mutex_lock(&sit_i->sentry_lock);
1717
1718 /*
184a5cd2
CY		 1719 * add and account sit entries of dirty bitmap in sit entry
1720 * set temporarily
351df4b2 1721 */
184a5cd2 1722 add_sits_in_set(sbi);
351df4b2 1723
184a5cd2
CY		 1724 /*
1725 * if there are no enough space in journal to store dirty sit
1726 * entries, remove all entries from journal and add and account
1727 * them in sit entry set.
1728 */
1729 if (!__has_cursum_space(sum, sit_i->dirty_sentries, SIT_JOURNAL))
1730 remove_sits_in_journal(sbi);
b2955550 1731
184a5cd2
CY		 1732 if (!sit_i->dirty_sentries)
1733 goto out;
351df4b2 1734
184a5cd2
CY		 1735 /*
1736 * there are two steps to flush sit entries:
1737 * #1, flush sit entries to journal in current cold data summary block.
1738 * #2, flush sit entries to sit page.
1739 */
1740 list_for_each_entry_safe(ses, tmp, head, set_list) {
4a257ed6 1741 struct page *page = NULL;
184a5cd2
CY		 1742 struct f2fs_sit_block *raw_sit = NULL;
1743 unsigned int start_segno = ses->start_segno;
1744 unsigned int end = min(start_segno + SIT_ENTRY_PER_BLOCK,
7cd8558b 1745 (unsigned long)MAIN_SEGS(sbi));
184a5cd2
CY		 1746 unsigned int segno = start_segno;
1747
1748 if (to_journal &&
1749 !__has_cursum_space(sum, ses->entry_cnt, SIT_JOURNAL))
1750 to_journal = false;
1751
1752 if (!to_journal) {
1753 page = get_next_sit_page(sbi, start_segno);
1754 raw_sit = page_address(page);
351df4b2 1755 }
351df4b2 1756
184a5cd2
CY		 1757 /* flush dirty sit entries in region of current sit set */
1758 for_each_set_bit_from(segno, bitmap, end) {
1759 int offset, sit_offset;
4b2fecc8
JK		 1760
1761 se = get_seg_entry(sbi, segno);
184a5cd2
CY		 1762
1763 /* add discard candidates */
d7bc2484 1764 if (cpc->reason != CP_DISCARD) {
4b2fecc8
JK		 1765 cpc->trim_start = segno;
1766 add_discard_addrs(sbi, cpc);
1767 }
184a5cd2
CY		 1768
1769 if (to_journal) {
1770 offset = lookup_journal_in_cursum(sum,
1771 SIT_JOURNAL, segno, 1);
1772 f2fs_bug_on(sbi, offset < 0);
1773 segno_in_journal(sum, offset) =
1774 cpu_to_le32(segno);
1775 seg_info_to_raw_sit(se,
1776 &sit_in_journal(sum, offset));
1777 } else {
1778 sit_offset = SIT_ENTRY_OFFSET(sit_i, segno);
1779 seg_info_to_raw_sit(se,
1780 &raw_sit->entries[sit_offset]);
1781 }
351df4b2 1782
184a5cd2
CY		 1783 __clear_bit(segno, bitmap);
1784 sit_i->dirty_sentries--;
1785 ses->entry_cnt--;
351df4b2
JK		 1786 }
1787
184a5cd2
CY		 1788 if (!to_journal)
1789 f2fs_put_page(page, 1);
1790
1791 f2fs_bug_on(sbi, ses->entry_cnt);
1792 release_sit_entry_set(ses);
351df4b2 1793 }
184a5cd2
CY		 1794
1795 f2fs_bug_on(sbi, !list_empty(head));
1796 f2fs_bug_on(sbi, sit_i->dirty_sentries);
184a5cd2 1797out:
4b2fecc8
JK		 1798 if (cpc->reason == CP_DISCARD) {
1799 for (; cpc->trim_start <= cpc->trim_end; cpc->trim_start++)
1800 add_discard_addrs(sbi, cpc);
1801 }
351df4b2
JK		 1802 mutex_unlock(&sit_i->sentry_lock);
1803 mutex_unlock(&curseg->curseg_mutex);
1804
351df4b2
JK		 1805 set_prefree_as_free_segments(sbi);
1806}
1807
1808static int build_sit_info(struct f2fs_sb_info *sbi)
1809{
1810 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
1811 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1812 struct sit_info *sit_i;
1813 unsigned int sit_segs, start;
1814 char *src_bitmap, *dst_bitmap;
1815 unsigned int bitmap_size;
1816
1817 /* allocate memory for SIT information */
1818 sit_i = kzalloc(sizeof(struct sit_info), GFP_KERNEL);
1819 if (!sit_i)
1820 return -ENOMEM;
1821
1822 SM_I(sbi)->sit_info = sit_i;
1823
7cd8558b 1824 sit_i->sentries = vzalloc(MAIN_SEGS(sbi) * sizeof(struct seg_entry));
351df4b2
JK		 1825 if (!sit_i->sentries)
1826 return -ENOMEM;
1827
7cd8558b 1828 bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
351df4b2
JK		 1829 sit_i->dirty_sentries_bitmap = kzalloc(bitmap_size, GFP_KERNEL);
1830 if (!sit_i->dirty_sentries_bitmap)
1831 return -ENOMEM;
1832
7cd8558b 1833 for (start = 0; start < MAIN_SEGS(sbi); start++) {
351df4b2
JK		 1834 sit_i->sentries[start].cur_valid_map
1835 = kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
1836 sit_i->sentries[start].ckpt_valid_map
1837 = kzalloc(SIT_VBLOCK_MAP_SIZE, GFP_KERNEL);
1838 if (!sit_i->sentries[start].cur_valid_map
1839 || !sit_i->sentries[start].ckpt_valid_map)
1840 return -ENOMEM;
1841 }
1842
1843 if (sbi->segs_per_sec > 1) {
7cd8558b 1844 sit_i->sec_entries = vzalloc(MAIN_SECS(sbi) *
351df4b2
JK		 1845 sizeof(struct sec_entry));
1846 if (!sit_i->sec_entries)
1847 return -ENOMEM;
1848 }
1849
1850 /* get information related with SIT */
1851 sit_segs = le32_to_cpu(raw_super->segment_count_sit) >> 1;
1852
1853 /* setup SIT bitmap from ckeckpoint pack */
1854 bitmap_size = __bitmap_size(sbi, SIT_BITMAP);
1855 src_bitmap = __bitmap_ptr(sbi, SIT_BITMAP);
1856
79b5793b 1857 dst_bitmap = kmemdup(src_bitmap, bitmap_size, GFP_KERNEL);
351df4b2
JK		 1858 if (!dst_bitmap)
1859 return -ENOMEM;
351df4b2
JK		 1860
1861 /* init SIT information */
1862 sit_i->s_ops = &default_salloc_ops;
1863
1864 sit_i->sit_base_addr = le32_to_cpu(raw_super->sit_blkaddr);
1865 sit_i->sit_blocks = sit_segs << sbi->log_blocks_per_seg;
1866 sit_i->written_valid_blocks = le64_to_cpu(ckpt->valid_block_count);
1867 sit_i->sit_bitmap = dst_bitmap;
1868 sit_i->bitmap_size = bitmap_size;
1869 sit_i->dirty_sentries = 0;
1870 sit_i->sents_per_block = SIT_ENTRY_PER_BLOCK;
1871 sit_i->elapsed_time = le64_to_cpu(sbi->ckpt->elapsed_time);
1872 sit_i->mounted_time = CURRENT_TIME_SEC.tv_sec;
1873 mutex_init(&sit_i->sentry_lock);
1874 return 0;
1875}
1876
1877static int build_free_segmap(struct f2fs_sb_info *sbi)
1878{
351df4b2
JK		 1879 struct free_segmap_info *free_i;
1880 unsigned int bitmap_size, sec_bitmap_size;
1881
1882 /* allocate memory for free segmap information */
1883 free_i = kzalloc(sizeof(struct free_segmap_info), GFP_KERNEL);
1884 if (!free_i)
1885 return -ENOMEM;
1886
1887 SM_I(sbi)->free_info = free_i;
1888
7cd8558b 1889 bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
351df4b2
JK		 1890 free_i->free_segmap = kmalloc(bitmap_size, GFP_KERNEL);
1891 if (!free_i->free_segmap)
1892 return -ENOMEM;
1893
7cd8558b 1894 sec_bitmap_size = f2fs_bitmap_size(MAIN_SECS(sbi));
351df4b2
JK		 1895 free_i->free_secmap = kmalloc(sec_bitmap_size, GFP_KERNEL);
1896 if (!free_i->free_secmap)
1897 return -ENOMEM;
1898
1899 /* set all segments as dirty temporarily */
1900 memset(free_i->free_segmap, 0xff, bitmap_size);
1901 memset(free_i->free_secmap, 0xff, sec_bitmap_size);
1902
1903 /* init free segmap information */
7cd8558b 1904 free_i->start_segno = GET_SEGNO_FROM_SEG0(sbi, MAIN_BLKADDR(sbi));
351df4b2
JK		 1905 free_i->free_segments = 0;
1906 free_i->free_sections = 0;
1907 rwlock_init(&free_i->segmap_lock);
1908 return 0;
1909}
1910
1911static int build_curseg(struct f2fs_sb_info *sbi)
1912{
1042d60f 1913 struct curseg_info *array;
351df4b2
JK		 1914 int i;
1915
b434babf 1916 array = kcalloc(NR_CURSEG_TYPE, sizeof(*array), GFP_KERNEL);
351df4b2
JK		 1917 if (!array)
1918 return -ENOMEM;
1919
1920 SM_I(sbi)->curseg_array = array;
1921
1922 for (i = 0; i < NR_CURSEG_TYPE; i++) {
1923 mutex_init(&array[i].curseg_mutex);
1924 array[i].sum_blk = kzalloc(PAGE_CACHE_SIZE, GFP_KERNEL);
1925 if (!array[i].sum_blk)
1926 return -ENOMEM;
1927 array[i].segno = NULL_SEGNO;
1928 array[i].next_blkoff = 0;
1929 }
1930 return restore_curseg_summaries(sbi);
1931}
1932
1933static void build_sit_entries(struct f2fs_sb_info *sbi)
1934{
1935 struct sit_info *sit_i = SIT_I(sbi);
1936 struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_COLD_DATA);
1937 struct f2fs_summary_block *sum = curseg->sum_blk;
74de593a
CY		 1938 int sit_blk_cnt = SIT_BLK_CNT(sbi);
1939 unsigned int i, start, end;
1940 unsigned int readed, start_blk = 0;
90a893c7 1941 int nrpages = MAX_BIO_BLOCKS(sbi);
351df4b2 1942
74de593a 1943 do {
662befda 1944 readed = ra_meta_pages(sbi, start_blk, nrpages, META_SIT);
74de593a
CY		 1945
1946 start = start_blk * sit_i->sents_per_block;
1947 end = (start_blk + readed) * sit_i->sents_per_block;
1948
7cd8558b 1949 for (; start < end && start < MAIN_SEGS(sbi); start++) {
74de593a
CY		 1950 struct seg_entry *se = &sit_i->sentries[start];
1951 struct f2fs_sit_block *sit_blk;
1952 struct f2fs_sit_entry sit;
1953 struct page *page;
1954
1955 mutex_lock(&curseg->curseg_mutex);
1956 for (i = 0; i < sits_in_cursum(sum); i++) {
6c311ec6
CF		 1957 if (le32_to_cpu(segno_in_journal(sum, i))
1958 == start) {
74de593a
CY		 1959 sit = sit_in_journal(sum, i);
1960 mutex_unlock(&curseg->curseg_mutex);
1961 goto got_it;
1962 }
351df4b2 1963 }
74de593a
CY		 1964 mutex_unlock(&curseg->curseg_mutex);
1965
1966 page = get_current_sit_page(sbi, start);
1967 sit_blk = (struct f2fs_sit_block *)page_address(page);
1968 sit = sit_blk->entries[SIT_ENTRY_OFFSET(sit_i, start)];
1969 f2fs_put_page(page, 1);
351df4b2 1970got_it:
74de593a
CY		 1971 check_block_count(sbi, start, &sit);
1972 seg_info_from_raw_sit(se, &sit);
1973 if (sbi->segs_per_sec > 1) {
1974 struct sec_entry *e = get_sec_entry(sbi, start);
1975 e->valid_blocks += se->valid_blocks;
1976 }
351df4b2 1977 }
74de593a
CY		 1978 start_blk += readed;
1979 } while (start_blk < sit_blk_cnt);
351df4b2
JK		 1980}
1981
1982static void init_free_segmap(struct f2fs_sb_info *sbi)
1983{
1984 unsigned int start;
1985 int type;
1986
7cd8558b 1987 for (start = 0; start < MAIN_SEGS(sbi); start++) {
351df4b2
JK		 1988 struct seg_entry *sentry = get_seg_entry(sbi, start);
1989 if (!sentry->valid_blocks)
1990 __set_free(sbi, start);
1991 }
1992
1993 /* set use the current segments */
1994 for (type = CURSEG_HOT_DATA; type <= CURSEG_COLD_NODE; type++) {
1995 struct curseg_info *curseg_t = CURSEG_I(sbi, type);
1996 __set_test_and_inuse(sbi, curseg_t->segno);
1997 }
1998}
1999
2000static void init_dirty_segmap(struct f2fs_sb_info *sbi)
2001{
2002 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
2003 struct free_segmap_info *free_i = FREE_I(sbi);
7cd8558b 2004 unsigned int segno = 0, offset = 0;
351df4b2
JK		 2005 unsigned short valid_blocks;
2006
8736fbf0 2007 while (1) {
351df4b2 2008 /* find dirty segment based on free segmap */
7cd8558b
JK		 2009 segno = find_next_inuse(free_i, MAIN_SEGS(sbi), offset);
2010 if (segno >= MAIN_SEGS(sbi))
351df4b2
JK		 2011 break;
2012 offset = segno + 1;
2013 valid_blocks = get_valid_blocks(sbi, segno, 0);
ec325b52 2014 if (valid_blocks == sbi->blocks_per_seg || !valid_blocks)
351df4b2 2015 continue;
ec325b52
JK		 2016 if (valid_blocks > sbi->blocks_per_seg) {
2017 f2fs_bug_on(sbi, 1);
2018 continue;
2019 }
351df4b2
JK		 2020 mutex_lock(&dirty_i->seglist_lock);
2021 __locate_dirty_segment(sbi, segno, DIRTY);
2022 mutex_unlock(&dirty_i->seglist_lock);
2023 }
2024}
2025
5ec4e49f 2026static int init_victim_secmap(struct f2fs_sb_info *sbi)
351df4b2
JK		 2027{
2028 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
7cd8558b 2029 unsigned int bitmap_size = f2fs_bitmap_size(MAIN_SECS(sbi));
351df4b2 2030
5ec4e49f
JK		 2031 dirty_i->victim_secmap = kzalloc(bitmap_size, GFP_KERNEL);
2032 if (!dirty_i->victim_secmap)
351df4b2
JK		 2033 return -ENOMEM;
2034 return 0;
2035}
2036
2037static int build_dirty_segmap(struct f2fs_sb_info *sbi)
2038{
2039 struct dirty_seglist_info *dirty_i;
2040 unsigned int bitmap_size, i;
2041
2042 /* allocate memory for dirty segments list information */
2043 dirty_i = kzalloc(sizeof(struct dirty_seglist_info), GFP_KERNEL);
2044 if (!dirty_i)
2045 return -ENOMEM;
2046
2047 SM_I(sbi)->dirty_info = dirty_i;
2048 mutex_init(&dirty_i->seglist_lock);
2049
7cd8558b 2050 bitmap_size = f2fs_bitmap_size(MAIN_SEGS(sbi));
351df4b2
JK		 2051
2052 for (i = 0; i < NR_DIRTY_TYPE; i++) {
2053 dirty_i->dirty_segmap[i] = kzalloc(bitmap_size, GFP_KERNEL);
351df4b2
JK		 2054 if (!dirty_i->dirty_segmap[i])
2055 return -ENOMEM;
2056 }
2057
2058 init_dirty_segmap(sbi);
5ec4e49f 2059 return init_victim_secmap(sbi);
351df4b2
JK		 2060}
2061
0a8165d7 2062/*
351df4b2
JK		 2063 * Update min, max modified time for cost-benefit GC algorithm
2064 */
2065static void init_min_max_mtime(struct f2fs_sb_info *sbi)
2066{
2067 struct sit_info *sit_i = SIT_I(sbi);
2068 unsigned int segno;
2069
2070 mutex_lock(&sit_i->sentry_lock);
2071
2072 sit_i->min_mtime = LLONG_MAX;
2073
7cd8558b 2074 for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) {
351df4b2
JK		 2075 unsigned int i;
2076 unsigned long long mtime = 0;
2077
2078 for (i = 0; i < sbi->segs_per_sec; i++)
2079 mtime += get_seg_entry(sbi, segno + i)->mtime;
2080
2081 mtime = div_u64(mtime, sbi->segs_per_sec);
2082
2083 if (sit_i->min_mtime > mtime)
2084 sit_i->min_mtime = mtime;
2085 }
2086 sit_i->max_mtime = get_mtime(sbi);
2087 mutex_unlock(&sit_i->sentry_lock);
2088}
2089
2090int build_segment_manager(struct f2fs_sb_info *sbi)
2091{
2092 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
2093 struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1042d60f 2094 struct f2fs_sm_info *sm_info;
351df4b2
JK		 2095 int err;
2096
2097 sm_info = kzalloc(sizeof(struct f2fs_sm_info), GFP_KERNEL);
2098 if (!sm_info)
2099 return -ENOMEM;
2100
2101 /* init sm info */
2102 sbi->sm_info = sm_info;
351df4b2
JK		 2103 sm_info->seg0_blkaddr = le32_to_cpu(raw_super->segment0_blkaddr);
2104 sm_info->main_blkaddr = le32_to_cpu(raw_super->main_blkaddr);
2105 sm_info->segment_count = le32_to_cpu(raw_super->segment_count);
2106 sm_info->reserved_segments = le32_to_cpu(ckpt->rsvd_segment_count);
2107 sm_info->ovp_segments = le32_to_cpu(ckpt->overprov_segment_count);
2108 sm_info->main_segments = le32_to_cpu(raw_super->segment_count_main);
2109 sm_info->ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
58c41035
JK		 2110 sm_info->rec_prefree_segments = sm_info->main_segments *
2111 DEF_RECLAIM_PREFREE_SEGMENTS / 100;
9b5f136f 2112 sm_info->ipu_policy = 1 << F2FS_IPU_FSYNC;
216fbd64 2113 sm_info->min_ipu_util = DEF_MIN_IPU_UTIL;
c1ce1b02 2114 sm_info->min_fsync_blocks = DEF_MIN_FSYNC_BLOCKS;
351df4b2 2115
7fd9e544
JK		 2116 INIT_LIST_HEAD(&sm_info->discard_list);
2117 sm_info->nr_discards = 0;
2118 sm_info->max_discards = 0;
2119
184a5cd2
CY		 2120 INIT_LIST_HEAD(&sm_info->sit_entry_set);
2121
b270ad6f 2122 if (test_opt(sbi, FLUSH_MERGE) && !f2fs_readonly(sbi->sb)) {
2163d198
GZ		 2123 err = create_flush_cmd_control(sbi);
2124 if (err)
a688b9d9 2125 return err;
6b4afdd7
JK		 2126 }
2127
351df4b2
JK		 2128 err = build_sit_info(sbi);
2129 if (err)
2130 return err;
2131 err = build_free_segmap(sbi);
2132 if (err)
2133 return err;
2134 err = build_curseg(sbi);
2135 if (err)
2136 return err;
2137
2138 /* reinit free segmap based on SIT */
2139 build_sit_entries(sbi);
2140
2141 init_free_segmap(sbi);
2142 err = build_dirty_segmap(sbi);
2143 if (err)
2144 return err;
2145
2146 init_min_max_mtime(sbi);
2147 return 0;
2148}
2149
2150static void discard_dirty_segmap(struct f2fs_sb_info *sbi,
2151 enum dirty_type dirty_type)
2152{
2153 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
2154
2155 mutex_lock(&dirty_i->seglist_lock);
2156 kfree(dirty_i->dirty_segmap[dirty_type]);
2157 dirty_i->nr_dirty[dirty_type] = 0;
2158 mutex_unlock(&dirty_i->seglist_lock);
2159}
2160
5ec4e49f 2161static void destroy_victim_secmap(struct f2fs_sb_info *sbi)
351df4b2
JK		 2162{
2163 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
5ec4e49f 2164 kfree(dirty_i->victim_secmap);
351df4b2
JK		 2165}
2166
2167static void destroy_dirty_segmap(struct f2fs_sb_info *sbi)
2168{
2169 struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
2170 int i;
2171
2172 if (!dirty_i)
2173 return;
2174
2175 /* discard pre-free/dirty segments list */
2176 for (i = 0; i < NR_DIRTY_TYPE; i++)
2177 discard_dirty_segmap(sbi, i);
2178
5ec4e49f 2179 destroy_victim_secmap(sbi);
351df4b2
JK		 2180 SM_I(sbi)->dirty_info = NULL;
2181 kfree(dirty_i);
2182}
2183
2184static void destroy_curseg(struct f2fs_sb_info *sbi)
2185{
2186 struct curseg_info *array = SM_I(sbi)->curseg_array;
2187 int i;
2188
2189 if (!array)
2190 return;
2191 SM_I(sbi)->curseg_array = NULL;
2192 for (i = 0; i < NR_CURSEG_TYPE; i++)
2193 kfree(array[i].sum_blk);
2194 kfree(array);
2195}
2196
2197static void destroy_free_segmap(struct f2fs_sb_info *sbi)
2198{
2199 struct free_segmap_info *free_i = SM_I(sbi)->free_info;
2200 if (!free_i)
2201 return;
2202 SM_I(sbi)->free_info = NULL;
2203 kfree(free_i->free_segmap);
2204 kfree(free_i->free_secmap);
2205 kfree(free_i);
2206}
2207
2208static void destroy_sit_info(struct f2fs_sb_info *sbi)
2209{
2210 struct sit_info *sit_i = SIT_I(sbi);
2211 unsigned int start;
2212
2213 if (!sit_i)
2214 return;
2215
2216 if (sit_i->sentries) {
7cd8558b 2217 for (start = 0; start < MAIN_SEGS(sbi); start++) {
351df4b2
JK		 2218 kfree(sit_i->sentries[start].cur_valid_map);
2219 kfree(sit_i->sentries[start].ckpt_valid_map);
2220 }
2221 }
2222 vfree(sit_i->sentries);
2223 vfree(sit_i->sec_entries);
2224 kfree(sit_i->dirty_sentries_bitmap);
2225
2226 SM_I(sbi)->sit_info = NULL;
2227 kfree(sit_i->sit_bitmap);
2228 kfree(sit_i);
2229}
2230
2231void destroy_segment_manager(struct f2fs_sb_info *sbi)
2232{
2233 struct f2fs_sm_info *sm_info = SM_I(sbi);
a688b9d9 2234
3b03f724
CY		 2235 if (!sm_info)
2236 return;
2163d198 2237 destroy_flush_cmd_control(sbi);
351df4b2
JK		 2238 destroy_dirty_segmap(sbi);
2239 destroy_curseg(sbi);
2240 destroy_free_segmap(sbi);
2241 destroy_sit_info(sbi);
2242 sbi->sm_info = NULL;
2243 kfree(sm_info);
2244}
7fd9e544
JK		 2245
2246int __init create_segment_manager_caches(void)
2247{
2248 discard_entry_slab = f2fs_kmem_cache_create("discard_entry",
e8512d2e 2249 sizeof(struct discard_entry));
7fd9e544 2250 if (!discard_entry_slab)
184a5cd2
CY		 2251 goto fail;
2252
2253 sit_entry_set_slab = f2fs_kmem_cache_create("sit_entry_set",
c9ee0085 2254 sizeof(struct sit_entry_set));
184a5cd2
CY		 2255 if (!sit_entry_set_slab)
2256 goto destory_discard_entry;
88b88a66
JK		 2257
2258 inmem_entry_slab = f2fs_kmem_cache_create("inmem_page_entry",
2259 sizeof(struct inmem_pages));
2260 if (!inmem_entry_slab)
2261 goto destroy_sit_entry_set;
7fd9e544 2262 return 0;
184a5cd2 2263
88b88a66
JK		 2264destroy_sit_entry_set:
2265 kmem_cache_destroy(sit_entry_set_slab);
184a5cd2
CY		 2266destory_discard_entry:
2267 kmem_cache_destroy(discard_entry_slab);
2268fail:
2269 return -ENOMEM;
7fd9e544
JK		 2270}
2271
2272void destroy_segment_manager_caches(void)
2273{
184a5cd2 2274 kmem_cache_destroy(sit_entry_set_slab);
7fd9e544 2275 kmem_cache_destroy(discard_entry_slab);
88b88a66 2276 kmem_cache_destroy(inmem_entry_slab);
7fd9e544 2277}
Linux kernel - Deliverables
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