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Merge tag 'keys-next-20160511' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowe...
[deliverable/linux.git] / fs / f2fs / node.c
1 /*
2 * fs/f2fs/node.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/mpage.h>
14 #include <linux/backing-dev.h>
15 #include <linux/blkdev.h>
16 #include <linux/pagevec.h>
17 #include <linux/swap.h>
18
19 #include "f2fs.h"
20 #include "node.h"
21 #include "segment.h"
22 #include "trace.h"
23 #include <trace/events/f2fs.h>
24
25 #define on_build_free_nids(nmi) mutex_is_locked(&nm_i->build_lock)
26
27 static struct kmem_cache *nat_entry_slab;
28 static struct kmem_cache *free_nid_slab;
29 static struct kmem_cache *nat_entry_set_slab;
30
31 bool available_free_memory(struct f2fs_sb_info *sbi, int type)
32 {
33 struct f2fs_nm_info *nm_i = NM_I(sbi);
34 struct sysinfo val;
35 unsigned long avail_ram;
36 unsigned long mem_size = 0;
37 bool res = false;
38
39 si_meminfo(&val);
40
41 /* only uses low memory */
42 avail_ram = val.totalram - val.totalhigh;
43
44 /*
45 * give 25%, 25%, 50%, 50%, 50% memory for each components respectively
46 */
47 if (type == FREE_NIDS) {
48 mem_size = (nm_i->fcnt * sizeof(struct free_nid)) >>
49 PAGE_SHIFT;
50 res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 2);
51 } else if (type == NAT_ENTRIES) {
52 mem_size = (nm_i->nat_cnt * sizeof(struct nat_entry)) >>
53 PAGE_SHIFT;
54 res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 2);
55 } else if (type == DIRTY_DENTS) {
56 if (sbi->sb->s_bdi->wb.dirty_exceeded)
57 return false;
58 mem_size = get_pages(sbi, F2FS_DIRTY_DENTS);
59 res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);
60 } else if (type == INO_ENTRIES) {
61 int i;
62
63 for (i = 0; i <= UPDATE_INO; i++)
64 mem_size += (sbi->im[i].ino_num *
65 sizeof(struct ino_entry)) >> PAGE_SHIFT;
66 res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);
67 } else if (type == EXTENT_CACHE) {
68 mem_size = (atomic_read(&sbi->total_ext_tree) *
69 sizeof(struct extent_tree) +
70 atomic_read(&sbi->total_ext_node) *
71 sizeof(struct extent_node)) >> PAGE_SHIFT;
72 res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);
73 } else {
74 if (!sbi->sb->s_bdi->wb.dirty_exceeded)
75 return true;
76 }
77 return res;
78 }
79
80 static void clear_node_page_dirty(struct page *page)
81 {
82 struct address_space *mapping = page->mapping;
83 unsigned int long flags;
84
85 if (PageDirty(page)) {
86 spin_lock_irqsave(&mapping->tree_lock, flags);
87 radix_tree_tag_clear(&mapping->page_tree,
88 page_index(page),
89 PAGECACHE_TAG_DIRTY);
90 spin_unlock_irqrestore(&mapping->tree_lock, flags);
91
92 clear_page_dirty_for_io(page);
93 dec_page_count(F2FS_M_SB(mapping), F2FS_DIRTY_NODES);
94 }
95 ClearPageUptodate(page);
96 }
97
98 static struct page *get_current_nat_page(struct f2fs_sb_info *sbi, nid_t nid)
99 {
100 pgoff_t index = current_nat_addr(sbi, nid);
101 return get_meta_page(sbi, index);
102 }
103
104 static struct page *get_next_nat_page(struct f2fs_sb_info *sbi, nid_t nid)
105 {
106 struct page *src_page;
107 struct page *dst_page;
108 pgoff_t src_off;
109 pgoff_t dst_off;
110 void *src_addr;
111 void *dst_addr;
112 struct f2fs_nm_info *nm_i = NM_I(sbi);
113
114 src_off = current_nat_addr(sbi, nid);
115 dst_off = next_nat_addr(sbi, src_off);
116
117 /* get current nat block page with lock */
118 src_page = get_meta_page(sbi, src_off);
119 dst_page = grab_meta_page(sbi, dst_off);
120 f2fs_bug_on(sbi, PageDirty(src_page));
121
122 src_addr = page_address(src_page);
123 dst_addr = page_address(dst_page);
124 memcpy(dst_addr, src_addr, PAGE_SIZE);
125 set_page_dirty(dst_page);
126 f2fs_put_page(src_page, 1);
127
128 set_to_next_nat(nm_i, nid);
129
130 return dst_page;
131 }
132
133 static struct nat_entry *__lookup_nat_cache(struct f2fs_nm_info *nm_i, nid_t n)
134 {
135 return radix_tree_lookup(&nm_i->nat_root, n);
136 }
137
138 static unsigned int __gang_lookup_nat_cache(struct f2fs_nm_info *nm_i,
139 nid_t start, unsigned int nr, struct nat_entry **ep)
140 {
141 return radix_tree_gang_lookup(&nm_i->nat_root, (void **)ep, start, nr);
142 }
143
144 static void __del_from_nat_cache(struct f2fs_nm_info *nm_i, struct nat_entry *e)
145 {
146 list_del(&e->list);
147 radix_tree_delete(&nm_i->nat_root, nat_get_nid(e));
148 nm_i->nat_cnt--;
149 kmem_cache_free(nat_entry_slab, e);
150 }
151
152 static void __set_nat_cache_dirty(struct f2fs_nm_info *nm_i,
153 struct nat_entry *ne)
154 {
155 nid_t set = NAT_BLOCK_OFFSET(ne->ni.nid);
156 struct nat_entry_set *head;
157
158 if (get_nat_flag(ne, IS_DIRTY))
159 return;
160
161 head = radix_tree_lookup(&nm_i->nat_set_root, set);
162 if (!head) {
163 head = f2fs_kmem_cache_alloc(nat_entry_set_slab, GFP_NOFS);
164
165 INIT_LIST_HEAD(&head->entry_list);
166 INIT_LIST_HEAD(&head->set_list);
167 head->set = set;
168 head->entry_cnt = 0;
169 f2fs_radix_tree_insert(&nm_i->nat_set_root, set, head);
170 }
171 list_move_tail(&ne->list, &head->entry_list);
172 nm_i->dirty_nat_cnt++;
173 head->entry_cnt++;
174 set_nat_flag(ne, IS_DIRTY, true);
175 }
176
177 static void __clear_nat_cache_dirty(struct f2fs_nm_info *nm_i,
178 struct nat_entry *ne)
179 {
180 nid_t set = NAT_BLOCK_OFFSET(ne->ni.nid);
181 struct nat_entry_set *head;
182
183 head = radix_tree_lookup(&nm_i->nat_set_root, set);
184 if (head) {
185 list_move_tail(&ne->list, &nm_i->nat_entries);
186 set_nat_flag(ne, IS_DIRTY, false);
187 head->entry_cnt--;
188 nm_i->dirty_nat_cnt--;
189 }
190 }
191
192 static unsigned int __gang_lookup_nat_set(struct f2fs_nm_info *nm_i,
193 nid_t start, unsigned int nr, struct nat_entry_set **ep)
194 {
195 return radix_tree_gang_lookup(&nm_i->nat_set_root, (void **)ep,
196 start, nr);
197 }
198
199 int need_dentry_mark(struct f2fs_sb_info *sbi, nid_t nid)
200 {
201 struct f2fs_nm_info *nm_i = NM_I(sbi);
202 struct nat_entry *e;
203 bool need = false;
204
205 down_read(&nm_i->nat_tree_lock);
206 e = __lookup_nat_cache(nm_i, nid);
207 if (e) {
208 if (!get_nat_flag(e, IS_CHECKPOINTED) &&
209 !get_nat_flag(e, HAS_FSYNCED_INODE))
210 need = true;
211 }
212 up_read(&nm_i->nat_tree_lock);
213 return need;
214 }
215
216 bool is_checkpointed_node(struct f2fs_sb_info *sbi, nid_t nid)
217 {
218 struct f2fs_nm_info *nm_i = NM_I(sbi);
219 struct nat_entry *e;
220 bool is_cp = true;
221
222 down_read(&nm_i->nat_tree_lock);
223 e = __lookup_nat_cache(nm_i, nid);
224 if (e && !get_nat_flag(e, IS_CHECKPOINTED))
225 is_cp = false;
226 up_read(&nm_i->nat_tree_lock);
227 return is_cp;
228 }
229
230 bool need_inode_block_update(struct f2fs_sb_info *sbi, nid_t ino)
231 {
232 struct f2fs_nm_info *nm_i = NM_I(sbi);
233 struct nat_entry *e;
234 bool need_update = true;
235
236 down_read(&nm_i->nat_tree_lock);
237 e = __lookup_nat_cache(nm_i, ino);
238 if (e && get_nat_flag(e, HAS_LAST_FSYNC) &&
239 (get_nat_flag(e, IS_CHECKPOINTED) ||
240 get_nat_flag(e, HAS_FSYNCED_INODE)))
241 need_update = false;
242 up_read(&nm_i->nat_tree_lock);
243 return need_update;
244 }
245
246 static struct nat_entry *grab_nat_entry(struct f2fs_nm_info *nm_i, nid_t nid)
247 {
248 struct nat_entry *new;
249
250 new = f2fs_kmem_cache_alloc(nat_entry_slab, GFP_NOFS);
251 f2fs_radix_tree_insert(&nm_i->nat_root, nid, new);
252 memset(new, 0, sizeof(struct nat_entry));
253 nat_set_nid(new, nid);
254 nat_reset_flag(new);
255 list_add_tail(&new->list, &nm_i->nat_entries);
256 nm_i->nat_cnt++;
257 return new;
258 }
259
260 static void cache_nat_entry(struct f2fs_sb_info *sbi, nid_t nid,
261 struct f2fs_nat_entry *ne)
262 {
263 struct f2fs_nm_info *nm_i = NM_I(sbi);
264 struct nat_entry *e;
265
266 e = __lookup_nat_cache(nm_i, nid);
267 if (!e) {
268 e = grab_nat_entry(nm_i, nid);
269 node_info_from_raw_nat(&e->ni, ne);
270 } else {
271 f2fs_bug_on(sbi, nat_get_ino(e) != ne->ino ||
272 nat_get_blkaddr(e) != ne->block_addr ||
273 nat_get_version(e) != ne->version);
274 }
275 }
276
277 static void set_node_addr(struct f2fs_sb_info *sbi, struct node_info *ni,
278 block_t new_blkaddr, bool fsync_done)
279 {
280 struct f2fs_nm_info *nm_i = NM_I(sbi);
281 struct nat_entry *e;
282
283 down_write(&nm_i->nat_tree_lock);
284 e = __lookup_nat_cache(nm_i, ni->nid);
285 if (!e) {
286 e = grab_nat_entry(nm_i, ni->nid);
287 copy_node_info(&e->ni, ni);
288 f2fs_bug_on(sbi, ni->blk_addr == NEW_ADDR);
289 } else if (new_blkaddr == NEW_ADDR) {
290 /*
291 * when nid is reallocated,
292 * previous nat entry can be remained in nat cache.
293 * So, reinitialize it with new information.
294 */
295 copy_node_info(&e->ni, ni);
296 f2fs_bug_on(sbi, ni->blk_addr != NULL_ADDR);
297 }
298
299 /* sanity check */
300 f2fs_bug_on(sbi, nat_get_blkaddr(e) != ni->blk_addr);
301 f2fs_bug_on(sbi, nat_get_blkaddr(e) == NULL_ADDR &&
302 new_blkaddr == NULL_ADDR);
303 f2fs_bug_on(sbi, nat_get_blkaddr(e) == NEW_ADDR &&
304 new_blkaddr == NEW_ADDR);
305 f2fs_bug_on(sbi, nat_get_blkaddr(e) != NEW_ADDR &&
306 nat_get_blkaddr(e) != NULL_ADDR &&
307 new_blkaddr == NEW_ADDR);
308
309 /* increment version no as node is removed */
310 if (nat_get_blkaddr(e) != NEW_ADDR && new_blkaddr == NULL_ADDR) {
311 unsigned char version = nat_get_version(e);
312 nat_set_version(e, inc_node_version(version));
313
314 /* in order to reuse the nid */
315 if (nm_i->next_scan_nid > ni->nid)
316 nm_i->next_scan_nid = ni->nid;
317 }
318
319 /* change address */
320 nat_set_blkaddr(e, new_blkaddr);
321 if (new_blkaddr == NEW_ADDR || new_blkaddr == NULL_ADDR)
322 set_nat_flag(e, IS_CHECKPOINTED, false);
323 __set_nat_cache_dirty(nm_i, e);
324
325 /* update fsync_mark if its inode nat entry is still alive */
326 if (ni->nid != ni->ino)
327 e = __lookup_nat_cache(nm_i, ni->ino);
328 if (e) {
329 if (fsync_done && ni->nid == ni->ino)
330 set_nat_flag(e, HAS_FSYNCED_INODE, true);
331 set_nat_flag(e, HAS_LAST_FSYNC, fsync_done);
332 }
333 up_write(&nm_i->nat_tree_lock);
334 }
335
336 int try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink)
337 {
338 struct f2fs_nm_info *nm_i = NM_I(sbi);
339 int nr = nr_shrink;
340
341 if (!down_write_trylock(&nm_i->nat_tree_lock))
342 return 0;
343
344 while (nr_shrink && !list_empty(&nm_i->nat_entries)) {
345 struct nat_entry *ne;
346 ne = list_first_entry(&nm_i->nat_entries,
347 struct nat_entry, list);
348 __del_from_nat_cache(nm_i, ne);
349 nr_shrink--;
350 }
351 up_write(&nm_i->nat_tree_lock);
352 return nr - nr_shrink;
353 }
354
355 /*
356 * This function always returns success
357 */
358 void get_node_info(struct f2fs_sb_info *sbi, nid_t nid, struct node_info *ni)
359 {
360 struct f2fs_nm_info *nm_i = NM_I(sbi);
361 struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
362 struct f2fs_journal *journal = curseg->journal;
363 nid_t start_nid = START_NID(nid);
364 struct f2fs_nat_block *nat_blk;
365 struct page *page = NULL;
366 struct f2fs_nat_entry ne;
367 struct nat_entry *e;
368 int i;
369
370 ni->nid = nid;
371
372 /* Check nat cache */
373 down_read(&nm_i->nat_tree_lock);
374 e = __lookup_nat_cache(nm_i, nid);
375 if (e) {
376 ni->ino = nat_get_ino(e);
377 ni->blk_addr = nat_get_blkaddr(e);
378 ni->version = nat_get_version(e);
379 up_read(&nm_i->nat_tree_lock);
380 return;
381 }
382
383 memset(&ne, 0, sizeof(struct f2fs_nat_entry));
384
385 /* Check current segment summary */
386 down_read(&curseg->journal_rwsem);
387 i = lookup_journal_in_cursum(journal, NAT_JOURNAL, nid, 0);
388 if (i >= 0) {
389 ne = nat_in_journal(journal, i);
390 node_info_from_raw_nat(ni, &ne);
391 }
392 up_read(&curseg->journal_rwsem);
393 if (i >= 0)
394 goto cache;
395
396 /* Fill node_info from nat page */
397 page = get_current_nat_page(sbi, start_nid);
398 nat_blk = (struct f2fs_nat_block *)page_address(page);
399 ne = nat_blk->entries[nid - start_nid];
400 node_info_from_raw_nat(ni, &ne);
401 f2fs_put_page(page, 1);
402 cache:
403 up_read(&nm_i->nat_tree_lock);
404 /* cache nat entry */
405 down_write(&nm_i->nat_tree_lock);
406 cache_nat_entry(sbi, nid, &ne);
407 up_write(&nm_i->nat_tree_lock);
408 }
409
410 /*
411 * readahead MAX_RA_NODE number of node pages.
412 */
413 static void ra_node_pages(struct page *parent, int start, int n)
414 {
415 struct f2fs_sb_info *sbi = F2FS_P_SB(parent);
416 struct blk_plug plug;
417 int i, end;
418 nid_t nid;
419
420 blk_start_plug(&plug);
421
422 /* Then, try readahead for siblings of the desired node */
423 end = start + n;
424 end = min(end, NIDS_PER_BLOCK);
425 for (i = start; i < end; i++) {
426 nid = get_nid(parent, i, false);
427 ra_node_page(sbi, nid);
428 }
429
430 blk_finish_plug(&plug);
431 }
432
433 pgoff_t get_next_page_offset(struct dnode_of_data *dn, pgoff_t pgofs)
434 {
435 const long direct_index = ADDRS_PER_INODE(dn->inode);
436 const long direct_blks = ADDRS_PER_BLOCK;
437 const long indirect_blks = ADDRS_PER_BLOCK * NIDS_PER_BLOCK;
438 unsigned int skipped_unit = ADDRS_PER_BLOCK;
439 int cur_level = dn->cur_level;
440 int max_level = dn->max_level;
441 pgoff_t base = 0;
442
443 if (!dn->max_level)
444 return pgofs + 1;
445
446 while (max_level-- > cur_level)
447 skipped_unit *= NIDS_PER_BLOCK;
448
449 switch (dn->max_level) {
450 case 3:
451 base += 2 * indirect_blks;
452 case 2:
453 base += 2 * direct_blks;
454 case 1:
455 base += direct_index;
456 break;
457 default:
458 f2fs_bug_on(F2FS_I_SB(dn->inode), 1);
459 }
460
461 return ((pgofs - base) / skipped_unit + 1) * skipped_unit + base;
462 }
463
464 /*
465 * The maximum depth is four.
466 * Offset[0] will have raw inode offset.
467 */
468 static int get_node_path(struct inode *inode, long block,
469 int offset[4], unsigned int noffset[4])
470 {
471 const long direct_index = ADDRS_PER_INODE(inode);
472 const long direct_blks = ADDRS_PER_BLOCK;
473 const long dptrs_per_blk = NIDS_PER_BLOCK;
474 const long indirect_blks = ADDRS_PER_BLOCK * NIDS_PER_BLOCK;
475 const long dindirect_blks = indirect_blks * NIDS_PER_BLOCK;
476 int n = 0;
477 int level = 0;
478
479 noffset[0] = 0;
480
481 if (block < direct_index) {
482 offset[n] = block;
483 goto got;
484 }
485 block -= direct_index;
486 if (block < direct_blks) {
487 offset[n++] = NODE_DIR1_BLOCK;
488 noffset[n] = 1;
489 offset[n] = block;
490 level = 1;
491 goto got;
492 }
493 block -= direct_blks;
494 if (block < direct_blks) {
495 offset[n++] = NODE_DIR2_BLOCK;
496 noffset[n] = 2;
497 offset[n] = block;
498 level = 1;
499 goto got;
500 }
501 block -= direct_blks;
502 if (block < indirect_blks) {
503 offset[n++] = NODE_IND1_BLOCK;
504 noffset[n] = 3;
505 offset[n++] = block / direct_blks;
506 noffset[n] = 4 + offset[n - 1];
507 offset[n] = block % direct_blks;
508 level = 2;
509 goto got;
510 }
511 block -= indirect_blks;
512 if (block < indirect_blks) {
513 offset[n++] = NODE_IND2_BLOCK;
514 noffset[n] = 4 + dptrs_per_blk;
515 offset[n++] = block / direct_blks;
516 noffset[n] = 5 + dptrs_per_blk + offset[n - 1];
517 offset[n] = block % direct_blks;
518 level = 2;
519 goto got;
520 }
521 block -= indirect_blks;
522 if (block < dindirect_blks) {
523 offset[n++] = NODE_DIND_BLOCK;
524 noffset[n] = 5 + (dptrs_per_blk * 2);
525 offset[n++] = block / indirect_blks;
526 noffset[n] = 6 + (dptrs_per_blk * 2) +
527 offset[n - 1] * (dptrs_per_blk + 1);
528 offset[n++] = (block / direct_blks) % dptrs_per_blk;
529 noffset[n] = 7 + (dptrs_per_blk * 2) +
530 offset[n - 2] * (dptrs_per_blk + 1) +
531 offset[n - 1];
532 offset[n] = block % direct_blks;
533 level = 3;
534 goto got;
535 } else {
536 BUG();
537 }
538 got:
539 return level;
540 }
541
542 /*
543 * Caller should call f2fs_put_dnode(dn).
544 * Also, it should grab and release a rwsem by calling f2fs_lock_op() and
545 * f2fs_unlock_op() only if ro is not set RDONLY_NODE.
546 * In the case of RDONLY_NODE, we don't need to care about mutex.
547 */
548 int get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode)
549 {
550 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
551 struct page *npage[4];
552 struct page *parent = NULL;
553 int offset[4];
554 unsigned int noffset[4];
555 nid_t nids[4];
556 int level, i = 0;
557 int err = 0;
558
559 level = get_node_path(dn->inode, index, offset, noffset);
560
561 nids[0] = dn->inode->i_ino;
562 npage[0] = dn->inode_page;
563
564 if (!npage[0]) {
565 npage[0] = get_node_page(sbi, nids[0]);
566 if (IS_ERR(npage[0]))
567 return PTR_ERR(npage[0]);
568 }
569
570 /* if inline_data is set, should not report any block indices */
571 if (f2fs_has_inline_data(dn->inode) && index) {
572 err = -ENOENT;
573 f2fs_put_page(npage[0], 1);
574 goto release_out;
575 }
576
577 parent = npage[0];
578 if (level != 0)
579 nids[1] = get_nid(parent, offset[0], true);
580 dn->inode_page = npage[0];
581 dn->inode_page_locked = true;
582
583 /* get indirect or direct nodes */
584 for (i = 1; i <= level; i++) {
585 bool done = false;
586
587 if (!nids[i] && mode == ALLOC_NODE) {
588 /* alloc new node */
589 if (!alloc_nid(sbi, &(nids[i]))) {
590 err = -ENOSPC;
591 goto release_pages;
592 }
593
594 dn->nid = nids[i];
595 npage[i] = new_node_page(dn, noffset[i], NULL);
596 if (IS_ERR(npage[i])) {
597 alloc_nid_failed(sbi, nids[i]);
598 err = PTR_ERR(npage[i]);
599 goto release_pages;
600 }
601
602 set_nid(parent, offset[i - 1], nids[i], i == 1);
603 alloc_nid_done(sbi, nids[i]);
604 done = true;
605 } else if (mode == LOOKUP_NODE_RA && i == level && level > 1) {
606 npage[i] = get_node_page_ra(parent, offset[i - 1]);
607 if (IS_ERR(npage[i])) {
608 err = PTR_ERR(npage[i]);
609 goto release_pages;
610 }
611 done = true;
612 }
613 if (i == 1) {
614 dn->inode_page_locked = false;
615 unlock_page(parent);
616 } else {
617 f2fs_put_page(parent, 1);
618 }
619
620 if (!done) {
621 npage[i] = get_node_page(sbi, nids[i]);
622 if (IS_ERR(npage[i])) {
623 err = PTR_ERR(npage[i]);
624 f2fs_put_page(npage[0], 0);
625 goto release_out;
626 }
627 }
628 if (i < level) {
629 parent = npage[i];
630 nids[i + 1] = get_nid(parent, offset[i], false);
631 }
632 }
633 dn->nid = nids[level];
634 dn->ofs_in_node = offset[level];
635 dn->node_page = npage[level];
636 dn->data_blkaddr = datablock_addr(dn->node_page, dn->ofs_in_node);
637 return 0;
638
639 release_pages:
640 f2fs_put_page(parent, 1);
641 if (i > 1)
642 f2fs_put_page(npage[0], 0);
643 release_out:
644 dn->inode_page = NULL;
645 dn->node_page = NULL;
646 if (err == -ENOENT) {
647 dn->cur_level = i;
648 dn->max_level = level;
649 }
650 return err;
651 }
652
653 static void truncate_node(struct dnode_of_data *dn)
654 {
655 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
656 struct node_info ni;
657
658 get_node_info(sbi, dn->nid, &ni);
659 if (dn->inode->i_blocks == 0) {
660 f2fs_bug_on(sbi, ni.blk_addr != NULL_ADDR);
661 goto invalidate;
662 }
663 f2fs_bug_on(sbi, ni.blk_addr == NULL_ADDR);
664
665 /* Deallocate node address */
666 invalidate_blocks(sbi, ni.blk_addr);
667 dec_valid_node_count(sbi, dn->inode);
668 set_node_addr(sbi, &ni, NULL_ADDR, false);
669
670 if (dn->nid == dn->inode->i_ino) {
671 remove_orphan_inode(sbi, dn->nid);
672 dec_valid_inode_count(sbi);
673 } else {
674 sync_inode_page(dn);
675 }
676 invalidate:
677 clear_node_page_dirty(dn->node_page);
678 set_sbi_flag(sbi, SBI_IS_DIRTY);
679
680 f2fs_put_page(dn->node_page, 1);
681
682 invalidate_mapping_pages(NODE_MAPPING(sbi),
683 dn->node_page->index, dn->node_page->index);
684
685 dn->node_page = NULL;
686 trace_f2fs_truncate_node(dn->inode, dn->nid, ni.blk_addr);
687 }
688
689 static int truncate_dnode(struct dnode_of_data *dn)
690 {
691 struct page *page;
692
693 if (dn->nid == 0)
694 return 1;
695
696 /* get direct node */
697 page = get_node_page(F2FS_I_SB(dn->inode), dn->nid);
698 if (IS_ERR(page) && PTR_ERR(page) == -ENOENT)
699 return 1;
700 else if (IS_ERR(page))
701 return PTR_ERR(page);
702
703 /* Make dnode_of_data for parameter */
704 dn->node_page = page;
705 dn->ofs_in_node = 0;
706 truncate_data_blocks(dn);
707 truncate_node(dn);
708 return 1;
709 }
710
711 static int truncate_nodes(struct dnode_of_data *dn, unsigned int nofs,
712 int ofs, int depth)
713 {
714 struct dnode_of_data rdn = *dn;
715 struct page *page;
716 struct f2fs_node *rn;
717 nid_t child_nid;
718 unsigned int child_nofs;
719 int freed = 0;
720 int i, ret;
721
722 if (dn->nid == 0)
723 return NIDS_PER_BLOCK + 1;
724
725 trace_f2fs_truncate_nodes_enter(dn->inode, dn->nid, dn->data_blkaddr);
726
727 page = get_node_page(F2FS_I_SB(dn->inode), dn->nid);
728 if (IS_ERR(page)) {
729 trace_f2fs_truncate_nodes_exit(dn->inode, PTR_ERR(page));
730 return PTR_ERR(page);
731 }
732
733 ra_node_pages(page, ofs, NIDS_PER_BLOCK);
734
735 rn = F2FS_NODE(page);
736 if (depth < 3) {
737 for (i = ofs; i < NIDS_PER_BLOCK; i++, freed++) {
738 child_nid = le32_to_cpu(rn->in.nid[i]);
739 if (child_nid == 0)
740 continue;
741 rdn.nid = child_nid;
742 ret = truncate_dnode(&rdn);
743 if (ret < 0)
744 goto out_err;
745 if (set_nid(page, i, 0, false))
746 dn->node_changed = true;
747 }
748 } else {
749 child_nofs = nofs + ofs * (NIDS_PER_BLOCK + 1) + 1;
750 for (i = ofs; i < NIDS_PER_BLOCK; i++) {
751 child_nid = le32_to_cpu(rn->in.nid[i]);
752 if (child_nid == 0) {
753 child_nofs += NIDS_PER_BLOCK + 1;
754 continue;
755 }
756 rdn.nid = child_nid;
757 ret = truncate_nodes(&rdn, child_nofs, 0, depth - 1);
758 if (ret == (NIDS_PER_BLOCK + 1)) {
759 if (set_nid(page, i, 0, false))
760 dn->node_changed = true;
761 child_nofs += ret;
762 } else if (ret < 0 && ret != -ENOENT) {
763 goto out_err;
764 }
765 }
766 freed = child_nofs;
767 }
768
769 if (!ofs) {
770 /* remove current indirect node */
771 dn->node_page = page;
772 truncate_node(dn);
773 freed++;
774 } else {
775 f2fs_put_page(page, 1);
776 }
777 trace_f2fs_truncate_nodes_exit(dn->inode, freed);
778 return freed;
779
780 out_err:
781 f2fs_put_page(page, 1);
782 trace_f2fs_truncate_nodes_exit(dn->inode, ret);
783 return ret;
784 }
785
786 static int truncate_partial_nodes(struct dnode_of_data *dn,
787 struct f2fs_inode *ri, int *offset, int depth)
788 {
789 struct page *pages[2];
790 nid_t nid[3];
791 nid_t child_nid;
792 int err = 0;
793 int i;
794 int idx = depth - 2;
795
796 nid[0] = le32_to_cpu(ri->i_nid[offset[0] - NODE_DIR1_BLOCK]);
797 if (!nid[0])
798 return 0;
799
800 /* get indirect nodes in the path */
801 for (i = 0; i < idx + 1; i++) {
802 /* reference count'll be increased */
803 pages[i] = get_node_page(F2FS_I_SB(dn->inode), nid[i]);
804 if (IS_ERR(pages[i])) {
805 err = PTR_ERR(pages[i]);
806 idx = i - 1;
807 goto fail;
808 }
809 nid[i + 1] = get_nid(pages[i], offset[i + 1], false);
810 }
811
812 ra_node_pages(pages[idx], offset[idx + 1], NIDS_PER_BLOCK);
813
814 /* free direct nodes linked to a partial indirect node */
815 for (i = offset[idx + 1]; i < NIDS_PER_BLOCK; i++) {
816 child_nid = get_nid(pages[idx], i, false);
817 if (!child_nid)
818 continue;
819 dn->nid = child_nid;
820 err = truncate_dnode(dn);
821 if (err < 0)
822 goto fail;
823 if (set_nid(pages[idx], i, 0, false))
824 dn->node_changed = true;
825 }
826
827 if (offset[idx + 1] == 0) {
828 dn->node_page = pages[idx];
829 dn->nid = nid[idx];
830 truncate_node(dn);
831 } else {
832 f2fs_put_page(pages[idx], 1);
833 }
834 offset[idx]++;
835 offset[idx + 1] = 0;
836 idx--;
837 fail:
838 for (i = idx; i >= 0; i--)
839 f2fs_put_page(pages[i], 1);
840
841 trace_f2fs_truncate_partial_nodes(dn->inode, nid, depth, err);
842
843 return err;
844 }
845
846 /*
847 * All the block addresses of data and nodes should be nullified.
848 */
849 int truncate_inode_blocks(struct inode *inode, pgoff_t from)
850 {
851 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
852 int err = 0, cont = 1;
853 int level, offset[4], noffset[4];
854 unsigned int nofs = 0;
855 struct f2fs_inode *ri;
856 struct dnode_of_data dn;
857 struct page *page;
858
859 trace_f2fs_truncate_inode_blocks_enter(inode, from);
860
861 level = get_node_path(inode, from, offset, noffset);
862
863 page = get_node_page(sbi, inode->i_ino);
864 if (IS_ERR(page)) {
865 trace_f2fs_truncate_inode_blocks_exit(inode, PTR_ERR(page));
866 return PTR_ERR(page);
867 }
868
869 set_new_dnode(&dn, inode, page, NULL, 0);
870 unlock_page(page);
871
872 ri = F2FS_INODE(page);
873 switch (level) {
874 case 0:
875 case 1:
876 nofs = noffset[1];
877 break;
878 case 2:
879 nofs = noffset[1];
880 if (!offset[level - 1])
881 goto skip_partial;
882 err = truncate_partial_nodes(&dn, ri, offset, level);
883 if (err < 0 && err != -ENOENT)
884 goto fail;
885 nofs += 1 + NIDS_PER_BLOCK;
886 break;
887 case 3:
888 nofs = 5 + 2 * NIDS_PER_BLOCK;
889 if (!offset[level - 1])
890 goto skip_partial;
891 err = truncate_partial_nodes(&dn, ri, offset, level);
892 if (err < 0 && err != -ENOENT)
893 goto fail;
894 break;
895 default:
896 BUG();
897 }
898
899 skip_partial:
900 while (cont) {
901 dn.nid = le32_to_cpu(ri->i_nid[offset[0] - NODE_DIR1_BLOCK]);
902 switch (offset[0]) {
903 case NODE_DIR1_BLOCK:
904 case NODE_DIR2_BLOCK:
905 err = truncate_dnode(&dn);
906 break;
907
908 case NODE_IND1_BLOCK:
909 case NODE_IND2_BLOCK:
910 err = truncate_nodes(&dn, nofs, offset[1], 2);
911 break;
912
913 case NODE_DIND_BLOCK:
914 err = truncate_nodes(&dn, nofs, offset[1], 3);
915 cont = 0;
916 break;
917
918 default:
919 BUG();
920 }
921 if (err < 0 && err != -ENOENT)
922 goto fail;
923 if (offset[1] == 0 &&
924 ri->i_nid[offset[0] - NODE_DIR1_BLOCK]) {
925 lock_page(page);
926 BUG_ON(page->mapping != NODE_MAPPING(sbi));
927 f2fs_wait_on_page_writeback(page, NODE, true);
928 ri->i_nid[offset[0] - NODE_DIR1_BLOCK] = 0;
929 set_page_dirty(page);
930 unlock_page(page);
931 }
932 offset[1] = 0;
933 offset[0]++;
934 nofs += err;
935 }
936 fail:
937 f2fs_put_page(page, 0);
938 trace_f2fs_truncate_inode_blocks_exit(inode, err);
939 return err > 0 ? 0 : err;
940 }
941
942 int truncate_xattr_node(struct inode *inode, struct page *page)
943 {
944 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
945 nid_t nid = F2FS_I(inode)->i_xattr_nid;
946 struct dnode_of_data dn;
947 struct page *npage;
948
949 if (!nid)
950 return 0;
951
952 npage = get_node_page(sbi, nid);
953 if (IS_ERR(npage))
954 return PTR_ERR(npage);
955
956 F2FS_I(inode)->i_xattr_nid = 0;
957
958 /* need to do checkpoint during fsync */
959 F2FS_I(inode)->xattr_ver = cur_cp_version(F2FS_CKPT(sbi));
960
961 set_new_dnode(&dn, inode, page, npage, nid);
962
963 if (page)
964 dn.inode_page_locked = true;
965 truncate_node(&dn);
966 return 0;
967 }
968
969 /*
970 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
971 * f2fs_unlock_op().
972 */
973 int remove_inode_page(struct inode *inode)
974 {
975 struct dnode_of_data dn;
976 int err;
977
978 set_new_dnode(&dn, inode, NULL, NULL, inode->i_ino);
979 err = get_dnode_of_data(&dn, 0, LOOKUP_NODE);
980 if (err)
981 return err;
982
983 err = truncate_xattr_node(inode, dn.inode_page);
984 if (err) {
985 f2fs_put_dnode(&dn);
986 return err;
987 }
988
989 /* remove potential inline_data blocks */
990 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
991 S_ISLNK(inode->i_mode))
992 truncate_data_blocks_range(&dn, 1);
993
994 /* 0 is possible, after f2fs_new_inode() has failed */
995 f2fs_bug_on(F2FS_I_SB(inode),
996 inode->i_blocks != 0 && inode->i_blocks != 1);
997
998 /* will put inode & node pages */
999 truncate_node(&dn);
1000 return 0;
1001 }
1002
1003 struct page *new_inode_page(struct inode *inode)
1004 {
1005 struct dnode_of_data dn;
1006
1007 /* allocate inode page for new inode */
1008 set_new_dnode(&dn, inode, NULL, NULL, inode->i_ino);
1009
1010 /* caller should f2fs_put_page(page, 1); */
1011 return new_node_page(&dn, 0, NULL);
1012 }
1013
1014 struct page *new_node_page(struct dnode_of_data *dn,
1015 unsigned int ofs, struct page *ipage)
1016 {
1017 struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
1018 struct node_info old_ni, new_ni;
1019 struct page *page;
1020 int err;
1021
1022 if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
1023 return ERR_PTR(-EPERM);
1024
1025 page = f2fs_grab_cache_page(NODE_MAPPING(sbi), dn->nid, false);
1026 if (!page)
1027 return ERR_PTR(-ENOMEM);
1028
1029 if (unlikely(!inc_valid_node_count(sbi, dn->inode))) {
1030 err = -ENOSPC;
1031 goto fail;
1032 }
1033
1034 get_node_info(sbi, dn->nid, &old_ni);
1035
1036 /* Reinitialize old_ni with new node page */
1037 f2fs_bug_on(sbi, old_ni.blk_addr != NULL_ADDR);
1038 new_ni = old_ni;
1039 new_ni.ino = dn->inode->i_ino;
1040 set_node_addr(sbi, &new_ni, NEW_ADDR, false);
1041
1042 f2fs_wait_on_page_writeback(page, NODE, true);
1043 fill_node_footer(page, dn->nid, dn->inode->i_ino, ofs, true);
1044 set_cold_node(dn->inode, page);
1045 SetPageUptodate(page);
1046 if (set_page_dirty(page))
1047 dn->node_changed = true;
1048
1049 if (f2fs_has_xattr_block(ofs))
1050 F2FS_I(dn->inode)->i_xattr_nid = dn->nid;
1051
1052 dn->node_page = page;
1053 if (ipage)
1054 update_inode(dn->inode, ipage);
1055 else
1056 sync_inode_page(dn);
1057 if (ofs == 0)
1058 inc_valid_inode_count(sbi);
1059
1060 return page;
1061
1062 fail:
1063 clear_node_page_dirty(page);
1064 f2fs_put_page(page, 1);
1065 return ERR_PTR(err);
1066 }
1067
1068 /*
1069 * Caller should do after getting the following values.
1070 * 0: f2fs_put_page(page, 0)
1071 * LOCKED_PAGE or error: f2fs_put_page(page, 1)
1072 */
1073 static int read_node_page(struct page *page, int rw)
1074 {
1075 struct f2fs_sb_info *sbi = F2FS_P_SB(page);
1076 struct node_info ni;
1077 struct f2fs_io_info fio = {
1078 .sbi = sbi,
1079 .type = NODE,
1080 .rw = rw,
1081 .page = page,
1082 .encrypted_page = NULL,
1083 };
1084
1085 get_node_info(sbi, page->index, &ni);
1086
1087 if (unlikely(ni.blk_addr == NULL_ADDR)) {
1088 ClearPageUptodate(page);
1089 return -ENOENT;
1090 }
1091
1092 if (PageUptodate(page))
1093 return LOCKED_PAGE;
1094
1095 fio.new_blkaddr = fio.old_blkaddr = ni.blk_addr;
1096 return f2fs_submit_page_bio(&fio);
1097 }
1098
1099 /*
1100 * Readahead a node page
1101 */
1102 void ra_node_page(struct f2fs_sb_info *sbi, nid_t nid)
1103 {
1104 struct page *apage;
1105 int err;
1106
1107 if (!nid)
1108 return;
1109 f2fs_bug_on(sbi, check_nid_range(sbi, nid));
1110
1111 rcu_read_lock();
1112 apage = radix_tree_lookup(&NODE_MAPPING(sbi)->page_tree, nid);
1113 rcu_read_unlock();
1114 if (apage)
1115 return;
1116
1117 apage = f2fs_grab_cache_page(NODE_MAPPING(sbi), nid, false);
1118 if (!apage)
1119 return;
1120
1121 err = read_node_page(apage, READA);
1122 f2fs_put_page(apage, err ? 1 : 0);
1123 }
1124
1125 static struct page *__get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid,
1126 struct page *parent, int start)
1127 {
1128 struct page *page;
1129 int err;
1130
1131 if (!nid)
1132 return ERR_PTR(-ENOENT);
1133 f2fs_bug_on(sbi, check_nid_range(sbi, nid));
1134 repeat:
1135 page = f2fs_grab_cache_page(NODE_MAPPING(sbi), nid, false);
1136 if (!page)
1137 return ERR_PTR(-ENOMEM);
1138
1139 err = read_node_page(page, READ_SYNC);
1140 if (err < 0) {
1141 f2fs_put_page(page, 1);
1142 return ERR_PTR(err);
1143 } else if (err == LOCKED_PAGE) {
1144 goto page_hit;
1145 }
1146
1147 if (parent)
1148 ra_node_pages(parent, start + 1, MAX_RA_NODE);
1149
1150 lock_page(page);
1151
1152 if (unlikely(!PageUptodate(page))) {
1153 f2fs_put_page(page, 1);
1154 return ERR_PTR(-EIO);
1155 }
1156 if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
1157 f2fs_put_page(page, 1);
1158 goto repeat;
1159 }
1160 page_hit:
1161 f2fs_bug_on(sbi, nid != nid_of_node(page));
1162 return page;
1163 }
1164
1165 struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)
1166 {
1167 return __get_node_page(sbi, nid, NULL, 0);
1168 }
1169
1170 struct page *get_node_page_ra(struct page *parent, int start)
1171 {
1172 struct f2fs_sb_info *sbi = F2FS_P_SB(parent);
1173 nid_t nid = get_nid(parent, start, false);
1174
1175 return __get_node_page(sbi, nid, parent, start);
1176 }
1177
1178 void sync_inode_page(struct dnode_of_data *dn)
1179 {
1180 int ret = 0;
1181
1182 if (IS_INODE(dn->node_page) || dn->inode_page == dn->node_page) {
1183 ret = update_inode(dn->inode, dn->node_page);
1184 } else if (dn->inode_page) {
1185 if (!dn->inode_page_locked)
1186 lock_page(dn->inode_page);
1187 ret = update_inode(dn->inode, dn->inode_page);
1188 if (!dn->inode_page_locked)
1189 unlock_page(dn->inode_page);
1190 } else {
1191 ret = update_inode_page(dn->inode);
1192 }
1193 dn->node_changed = ret ? true: false;
1194 }
1195
1196 static void flush_inline_data(struct f2fs_sb_info *sbi, nid_t ino)
1197 {
1198 struct inode *inode;
1199 struct page *page;
1200 int ret;
1201
1202 /* should flush inline_data before evict_inode */
1203 inode = ilookup(sbi->sb, ino);
1204 if (!inode)
1205 return;
1206
1207 page = pagecache_get_page(inode->i_mapping, 0, FGP_LOCK|FGP_NOWAIT, 0);
1208 if (!page)
1209 goto iput_out;
1210
1211 if (!PageUptodate(page))
1212 goto page_out;
1213
1214 if (!PageDirty(page))
1215 goto page_out;
1216
1217 if (!clear_page_dirty_for_io(page))
1218 goto page_out;
1219
1220 ret = f2fs_write_inline_data(inode, page);
1221 inode_dec_dirty_pages(inode);
1222 if (ret)
1223 set_page_dirty(page);
1224 page_out:
1225 f2fs_put_page(page, 1);
1226 iput_out:
1227 iput(inode);
1228 }
1229
1230 void move_node_page(struct page *node_page, int gc_type)
1231 {
1232 if (gc_type == FG_GC) {
1233 struct f2fs_sb_info *sbi = F2FS_P_SB(node_page);
1234 struct writeback_control wbc = {
1235 .sync_mode = WB_SYNC_ALL,
1236 .nr_to_write = 1,
1237 .for_reclaim = 0,
1238 };
1239
1240 set_page_dirty(node_page);
1241 f2fs_wait_on_page_writeback(node_page, NODE, true);
1242
1243 f2fs_bug_on(sbi, PageWriteback(node_page));
1244 if (!clear_page_dirty_for_io(node_page))
1245 goto out_page;
1246
1247 if (NODE_MAPPING(sbi)->a_ops->writepage(node_page, &wbc))
1248 unlock_page(node_page);
1249 goto release_page;
1250 } else {
1251 /* set page dirty and write it */
1252 if (!PageWriteback(node_page))
1253 set_page_dirty(node_page);
1254 }
1255 out_page:
1256 unlock_page(node_page);
1257 release_page:
1258 f2fs_put_page(node_page, 0);
1259 }
1260
1261 static struct page *last_fsync_dnode(struct f2fs_sb_info *sbi, nid_t ino)
1262 {
1263 pgoff_t index, end;
1264 struct pagevec pvec;
1265 struct page *last_page = NULL;
1266
1267 pagevec_init(&pvec, 0);
1268 index = 0;
1269 end = ULONG_MAX;
1270
1271 while (index <= end) {
1272 int i, nr_pages;
1273 nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
1274 PAGECACHE_TAG_DIRTY,
1275 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
1276 if (nr_pages == 0)
1277 break;
1278
1279 for (i = 0; i < nr_pages; i++) {
1280 struct page *page = pvec.pages[i];
1281
1282 if (unlikely(f2fs_cp_error(sbi))) {
1283 f2fs_put_page(last_page, 0);
1284 pagevec_release(&pvec);
1285 return ERR_PTR(-EIO);
1286 }
1287
1288 if (!IS_DNODE(page) || !is_cold_node(page))
1289 continue;
1290 if (ino_of_node(page) != ino)
1291 continue;
1292
1293 lock_page(page);
1294
1295 if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
1296 continue_unlock:
1297 unlock_page(page);
1298 continue;
1299 }
1300 if (ino_of_node(page) != ino)
1301 goto continue_unlock;
1302
1303 if (!PageDirty(page)) {
1304 /* someone wrote it for us */
1305 goto continue_unlock;
1306 }
1307
1308 if (last_page)
1309 f2fs_put_page(last_page, 0);
1310
1311 get_page(page);
1312 last_page = page;
1313 unlock_page(page);
1314 }
1315 pagevec_release(&pvec);
1316 cond_resched();
1317 }
1318 return last_page;
1319 }
1320
1321 int fsync_node_pages(struct f2fs_sb_info *sbi, nid_t ino,
1322 struct writeback_control *wbc, bool atomic)
1323 {
1324 pgoff_t index, end;
1325 struct pagevec pvec;
1326 int ret = 0;
1327 struct page *last_page = NULL;
1328 bool marked = false;
1329
1330 if (atomic) {
1331 last_page = last_fsync_dnode(sbi, ino);
1332 if (IS_ERR_OR_NULL(last_page))
1333 return PTR_ERR_OR_ZERO(last_page);
1334 }
1335 retry:
1336 pagevec_init(&pvec, 0);
1337 index = 0;
1338 end = ULONG_MAX;
1339
1340 while (index <= end) {
1341 int i, nr_pages;
1342 nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
1343 PAGECACHE_TAG_DIRTY,
1344 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
1345 if (nr_pages == 0)
1346 break;
1347
1348 for (i = 0; i < nr_pages; i++) {
1349 struct page *page = pvec.pages[i];
1350
1351 if (unlikely(f2fs_cp_error(sbi))) {
1352 f2fs_put_page(last_page, 0);
1353 pagevec_release(&pvec);
1354 return -EIO;
1355 }
1356
1357 if (!IS_DNODE(page) || !is_cold_node(page))
1358 continue;
1359 if (ino_of_node(page) != ino)
1360 continue;
1361
1362 lock_page(page);
1363
1364 if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
1365 continue_unlock:
1366 unlock_page(page);
1367 continue;
1368 }
1369 if (ino_of_node(page) != ino)
1370 goto continue_unlock;
1371
1372 if (!PageDirty(page) && page != last_page) {
1373 /* someone wrote it for us */
1374 goto continue_unlock;
1375 }
1376
1377 f2fs_wait_on_page_writeback(page, NODE, true);
1378 BUG_ON(PageWriteback(page));
1379
1380 if (!atomic || page == last_page) {
1381 set_fsync_mark(page, 1);
1382 if (IS_INODE(page))
1383 set_dentry_mark(page,
1384 need_dentry_mark(sbi, ino));
1385 /* may be written by other thread */
1386 if (!PageDirty(page))
1387 set_page_dirty(page);
1388 }
1389
1390 if (!clear_page_dirty_for_io(page))
1391 goto continue_unlock;
1392
1393 ret = NODE_MAPPING(sbi)->a_ops->writepage(page, wbc);
1394 if (ret) {
1395 unlock_page(page);
1396 f2fs_put_page(last_page, 0);
1397 break;
1398 }
1399 if (page == last_page) {
1400 f2fs_put_page(page, 0);
1401 marked = true;
1402 break;
1403 }
1404 }
1405 pagevec_release(&pvec);
1406 cond_resched();
1407
1408 if (ret || marked)
1409 break;
1410 }
1411 if (!ret && atomic && !marked) {
1412 f2fs_msg(sbi->sb, KERN_DEBUG,
1413 "Retry to write fsync mark: ino=%u, idx=%lx",
1414 ino, last_page->index);
1415 lock_page(last_page);
1416 set_page_dirty(last_page);
1417 unlock_page(last_page);
1418 goto retry;
1419 }
1420 return ret ? -EIO: 0;
1421 }
1422
1423 int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc)
1424 {
1425 pgoff_t index, end;
1426 struct pagevec pvec;
1427 int step = 0;
1428 int nwritten = 0;
1429
1430 pagevec_init(&pvec, 0);
1431
1432 next_step:
1433 index = 0;
1434 end = ULONG_MAX;
1435
1436 while (index <= end) {
1437 int i, nr_pages;
1438 nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
1439 PAGECACHE_TAG_DIRTY,
1440 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
1441 if (nr_pages == 0)
1442 break;
1443
1444 for (i = 0; i < nr_pages; i++) {
1445 struct page *page = pvec.pages[i];
1446
1447 if (unlikely(f2fs_cp_error(sbi))) {
1448 pagevec_release(&pvec);
1449 return -EIO;
1450 }
1451
1452 /*
1453 * flushing sequence with step:
1454 * 0. indirect nodes
1455 * 1. dentry dnodes
1456 * 2. file dnodes
1457 */
1458 if (step == 0 && IS_DNODE(page))
1459 continue;
1460 if (step == 1 && (!IS_DNODE(page) ||
1461 is_cold_node(page)))
1462 continue;
1463 if (step == 2 && (!IS_DNODE(page) ||
1464 !is_cold_node(page)))
1465 continue;
1466 lock_node:
1467 if (!trylock_page(page))
1468 continue;
1469
1470 if (unlikely(page->mapping != NODE_MAPPING(sbi))) {
1471 continue_unlock:
1472 unlock_page(page);
1473 continue;
1474 }
1475
1476 if (!PageDirty(page)) {
1477 /* someone wrote it for us */
1478 goto continue_unlock;
1479 }
1480
1481 /* flush inline_data */
1482 if (is_inline_node(page)) {
1483 clear_inline_node(page);
1484 unlock_page(page);
1485 flush_inline_data(sbi, ino_of_node(page));
1486 goto lock_node;
1487 }
1488
1489 f2fs_wait_on_page_writeback(page, NODE, true);
1490
1491 BUG_ON(PageWriteback(page));
1492 if (!clear_page_dirty_for_io(page))
1493 goto continue_unlock;
1494
1495 set_fsync_mark(page, 0);
1496 set_dentry_mark(page, 0);
1497
1498 if (NODE_MAPPING(sbi)->a_ops->writepage(page, wbc))
1499 unlock_page(page);
1500
1501 if (--wbc->nr_to_write == 0)
1502 break;
1503 }
1504 pagevec_release(&pvec);
1505 cond_resched();
1506
1507 if (wbc->nr_to_write == 0) {
1508 step = 2;
1509 break;
1510 }
1511 }
1512
1513 if (step < 2) {
1514 step++;
1515 goto next_step;
1516 }
1517 return nwritten;
1518 }
1519
1520 int wait_on_node_pages_writeback(struct f2fs_sb_info *sbi, nid_t ino)
1521 {
1522 pgoff_t index = 0, end = ULONG_MAX;
1523 struct pagevec pvec;
1524 int ret2 = 0, ret = 0;
1525
1526 pagevec_init(&pvec, 0);
1527
1528 while (index <= end) {
1529 int i, nr_pages;
1530 nr_pages = pagevec_lookup_tag(&pvec, NODE_MAPPING(sbi), &index,
1531 PAGECACHE_TAG_WRITEBACK,
1532 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
1533 if (nr_pages == 0)
1534 break;
1535
1536 for (i = 0; i < nr_pages; i++) {
1537 struct page *page = pvec.pages[i];
1538
1539 /* until radix tree lookup accepts end_index */
1540 if (unlikely(page->index > end))
1541 continue;
1542
1543 if (ino && ino_of_node(page) == ino) {
1544 f2fs_wait_on_page_writeback(page, NODE, true);
1545 if (TestClearPageError(page))
1546 ret = -EIO;
1547 }
1548 }
1549 pagevec_release(&pvec);
1550 cond_resched();
1551 }
1552
1553 if (unlikely(test_and_clear_bit(AS_ENOSPC, &NODE_MAPPING(sbi)->flags)))
1554 ret2 = -ENOSPC;
1555 if (unlikely(test_and_clear_bit(AS_EIO, &NODE_MAPPING(sbi)->flags)))
1556 ret2 = -EIO;
1557 if (!ret)
1558 ret = ret2;
1559 return ret;
1560 }
1561
1562 static int f2fs_write_node_page(struct page *page,
1563 struct writeback_control *wbc)
1564 {
1565 struct f2fs_sb_info *sbi = F2FS_P_SB(page);
1566 nid_t nid;
1567 struct node_info ni;
1568 struct f2fs_io_info fio = {
1569 .sbi = sbi,
1570 .type = NODE,
1571 .rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE,
1572 .page = page,
1573 .encrypted_page = NULL,
1574 };
1575
1576 trace_f2fs_writepage(page, NODE);
1577
1578 if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
1579 goto redirty_out;
1580 if (unlikely(f2fs_cp_error(sbi)))
1581 goto redirty_out;
1582
1583 /* get old block addr of this node page */
1584 nid = nid_of_node(page);
1585 f2fs_bug_on(sbi, page->index != nid);
1586
1587 if (wbc->for_reclaim) {
1588 if (!down_read_trylock(&sbi->node_write))
1589 goto redirty_out;
1590 } else {
1591 down_read(&sbi->node_write);
1592 }
1593
1594 get_node_info(sbi, nid, &ni);
1595
1596 /* This page is already truncated */
1597 if (unlikely(ni.blk_addr == NULL_ADDR)) {
1598 ClearPageUptodate(page);
1599 dec_page_count(sbi, F2FS_DIRTY_NODES);
1600 up_read(&sbi->node_write);
1601 unlock_page(page);
1602 return 0;
1603 }
1604
1605 set_page_writeback(page);
1606 fio.old_blkaddr = ni.blk_addr;
1607 write_node_page(nid, &fio);
1608 set_node_addr(sbi, &ni, fio.new_blkaddr, is_fsync_dnode(page));
1609 dec_page_count(sbi, F2FS_DIRTY_NODES);
1610 up_read(&sbi->node_write);
1611
1612 if (wbc->for_reclaim)
1613 f2fs_submit_merged_bio_cond(sbi, NULL, page, 0, NODE, WRITE);
1614
1615 unlock_page(page);
1616
1617 if (unlikely(f2fs_cp_error(sbi)))
1618 f2fs_submit_merged_bio(sbi, NODE, WRITE);
1619
1620 return 0;
1621
1622 redirty_out:
1623 redirty_page_for_writepage(wbc, page);
1624 return AOP_WRITEPAGE_ACTIVATE;
1625 }
1626
1627 static int f2fs_write_node_pages(struct address_space *mapping,
1628 struct writeback_control *wbc)
1629 {
1630 struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
1631 long diff;
1632
1633 /* balancing f2fs's metadata in background */
1634 f2fs_balance_fs_bg(sbi);
1635
1636 /* collect a number of dirty node pages and write together */
1637 if (get_pages(sbi, F2FS_DIRTY_NODES) < nr_pages_to_skip(sbi, NODE))
1638 goto skip_write;
1639
1640 trace_f2fs_writepages(mapping->host, wbc, NODE);
1641
1642 diff = nr_pages_to_write(sbi, NODE, wbc);
1643 wbc->sync_mode = WB_SYNC_NONE;
1644 sync_node_pages(sbi, wbc);
1645 wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff);
1646 return 0;
1647
1648 skip_write:
1649 wbc->pages_skipped += get_pages(sbi, F2FS_DIRTY_NODES);
1650 trace_f2fs_writepages(mapping->host, wbc, NODE);
1651 return 0;
1652 }
1653
1654 static int f2fs_set_node_page_dirty(struct page *page)
1655 {
1656 trace_f2fs_set_page_dirty(page, NODE);
1657
1658 SetPageUptodate(page);
1659 if (!PageDirty(page)) {
1660 __set_page_dirty_nobuffers(page);
1661 inc_page_count(F2FS_P_SB(page), F2FS_DIRTY_NODES);
1662 SetPagePrivate(page);
1663 f2fs_trace_pid(page);
1664 return 1;
1665 }
1666 return 0;
1667 }
1668
1669 /*
1670 * Structure of the f2fs node operations
1671 */
1672 const struct address_space_operations f2fs_node_aops = {
1673 .writepage = f2fs_write_node_page,
1674 .writepages = f2fs_write_node_pages,
1675 .set_page_dirty = f2fs_set_node_page_dirty,
1676 .invalidatepage = f2fs_invalidate_page,
1677 .releasepage = f2fs_release_page,
1678 };
1679
1680 static struct free_nid *__lookup_free_nid_list(struct f2fs_nm_info *nm_i,
1681 nid_t n)
1682 {
1683 return radix_tree_lookup(&nm_i->free_nid_root, n);
1684 }
1685
1686 static void __del_from_free_nid_list(struct f2fs_nm_info *nm_i,
1687 struct free_nid *i)
1688 {
1689 list_del(&i->list);
1690 radix_tree_delete(&nm_i->free_nid_root, i->nid);
1691 }
1692
1693 static int add_free_nid(struct f2fs_sb_info *sbi, nid_t nid, bool build)
1694 {
1695 struct f2fs_nm_info *nm_i = NM_I(sbi);
1696 struct free_nid *i;
1697 struct nat_entry *ne;
1698
1699 if (!available_free_memory(sbi, FREE_NIDS))
1700 return -1;
1701
1702 /* 0 nid should not be used */
1703 if (unlikely(nid == 0))
1704 return 0;
1705
1706 if (build) {
1707 /* do not add allocated nids */
1708 ne = __lookup_nat_cache(nm_i, nid);
1709 if (ne && (!get_nat_flag(ne, IS_CHECKPOINTED) ||
1710 nat_get_blkaddr(ne) != NULL_ADDR))
1711 return 0;
1712 }
1713
1714 i = f2fs_kmem_cache_alloc(free_nid_slab, GFP_NOFS);
1715 i->nid = nid;
1716 i->state = NID_NEW;
1717
1718 if (radix_tree_preload(GFP_NOFS)) {
1719 kmem_cache_free(free_nid_slab, i);
1720 return 0;
1721 }
1722
1723 spin_lock(&nm_i->free_nid_list_lock);
1724 if (radix_tree_insert(&nm_i->free_nid_root, i->nid, i)) {
1725 spin_unlock(&nm_i->free_nid_list_lock);
1726 radix_tree_preload_end();
1727 kmem_cache_free(free_nid_slab, i);
1728 return 0;
1729 }
1730 list_add_tail(&i->list, &nm_i->free_nid_list);
1731 nm_i->fcnt++;
1732 spin_unlock(&nm_i->free_nid_list_lock);
1733 radix_tree_preload_end();
1734 return 1;
1735 }
1736
1737 static void remove_free_nid(struct f2fs_nm_info *nm_i, nid_t nid)
1738 {
1739 struct free_nid *i;
1740 bool need_free = false;
1741
1742 spin_lock(&nm_i->free_nid_list_lock);
1743 i = __lookup_free_nid_list(nm_i, nid);
1744 if (i && i->state == NID_NEW) {
1745 __del_from_free_nid_list(nm_i, i);
1746 nm_i->fcnt--;
1747 need_free = true;
1748 }
1749 spin_unlock(&nm_i->free_nid_list_lock);
1750
1751 if (need_free)
1752 kmem_cache_free(free_nid_slab, i);
1753 }
1754
1755 static void scan_nat_page(struct f2fs_sb_info *sbi,
1756 struct page *nat_page, nid_t start_nid)
1757 {
1758 struct f2fs_nm_info *nm_i = NM_I(sbi);
1759 struct f2fs_nat_block *nat_blk = page_address(nat_page);
1760 block_t blk_addr;
1761 int i;
1762
1763 i = start_nid % NAT_ENTRY_PER_BLOCK;
1764
1765 for (; i < NAT_ENTRY_PER_BLOCK; i++, start_nid++) {
1766
1767 if (unlikely(start_nid >= nm_i->max_nid))
1768 break;
1769
1770 blk_addr = le32_to_cpu(nat_blk->entries[i].block_addr);
1771 f2fs_bug_on(sbi, blk_addr == NEW_ADDR);
1772 if (blk_addr == NULL_ADDR) {
1773 if (add_free_nid(sbi, start_nid, true) < 0)
1774 break;
1775 }
1776 }
1777 }
1778
1779 static void build_free_nids(struct f2fs_sb_info *sbi)
1780 {
1781 struct f2fs_nm_info *nm_i = NM_I(sbi);
1782 struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
1783 struct f2fs_journal *journal = curseg->journal;
1784 int i = 0;
1785 nid_t nid = nm_i->next_scan_nid;
1786
1787 /* Enough entries */
1788 if (nm_i->fcnt > NAT_ENTRY_PER_BLOCK)
1789 return;
1790
1791 /* readahead nat pages to be scanned */
1792 ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nid), FREE_NID_PAGES,
1793 META_NAT, true);
1794
1795 down_read(&nm_i->nat_tree_lock);
1796
1797 while (1) {
1798 struct page *page = get_current_nat_page(sbi, nid);
1799
1800 scan_nat_page(sbi, page, nid);
1801 f2fs_put_page(page, 1);
1802
1803 nid += (NAT_ENTRY_PER_BLOCK - (nid % NAT_ENTRY_PER_BLOCK));
1804 if (unlikely(nid >= nm_i->max_nid))
1805 nid = 0;
1806
1807 if (++i >= FREE_NID_PAGES)
1808 break;
1809 }
1810
1811 /* go to the next free nat pages to find free nids abundantly */
1812 nm_i->next_scan_nid = nid;
1813
1814 /* find free nids from current sum_pages */
1815 down_read(&curseg->journal_rwsem);
1816 for (i = 0; i < nats_in_cursum(journal); i++) {
1817 block_t addr;
1818
1819 addr = le32_to_cpu(nat_in_journal(journal, i).block_addr);
1820 nid = le32_to_cpu(nid_in_journal(journal, i));
1821 if (addr == NULL_ADDR)
1822 add_free_nid(sbi, nid, true);
1823 else
1824 remove_free_nid(nm_i, nid);
1825 }
1826 up_read(&curseg->journal_rwsem);
1827 up_read(&nm_i->nat_tree_lock);
1828
1829 ra_meta_pages(sbi, NAT_BLOCK_OFFSET(nm_i->next_scan_nid),
1830 nm_i->ra_nid_pages, META_NAT, false);
1831 }
1832
1833 /*
1834 * If this function returns success, caller can obtain a new nid
1835 * from second parameter of this function.
1836 * The returned nid could be used ino as well as nid when inode is created.
1837 */
1838 bool alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid)
1839 {
1840 struct f2fs_nm_info *nm_i = NM_I(sbi);
1841 struct free_nid *i = NULL;
1842 retry:
1843 #ifdef CONFIG_F2FS_FAULT_INJECTION
1844 if (time_to_inject(FAULT_ALLOC_NID))
1845 return false;
1846 #endif
1847 if (unlikely(sbi->total_valid_node_count + 1 > nm_i->available_nids))
1848 return false;
1849
1850 spin_lock(&nm_i->free_nid_list_lock);
1851
1852 /* We should not use stale free nids created by build_free_nids */
1853 if (nm_i->fcnt && !on_build_free_nids(nm_i)) {
1854 f2fs_bug_on(sbi, list_empty(&nm_i->free_nid_list));
1855 list_for_each_entry(i, &nm_i->free_nid_list, list)
1856 if (i->state == NID_NEW)
1857 break;
1858
1859 f2fs_bug_on(sbi, i->state != NID_NEW);
1860 *nid = i->nid;
1861 i->state = NID_ALLOC;
1862 nm_i->fcnt--;
1863 spin_unlock(&nm_i->free_nid_list_lock);
1864 return true;
1865 }
1866 spin_unlock(&nm_i->free_nid_list_lock);
1867
1868 /* Let's scan nat pages and its caches to get free nids */
1869 mutex_lock(&nm_i->build_lock);
1870 build_free_nids(sbi);
1871 mutex_unlock(&nm_i->build_lock);
1872 goto retry;
1873 }
1874
1875 /*
1876 * alloc_nid() should be called prior to this function.
1877 */
1878 void alloc_nid_done(struct f2fs_sb_info *sbi, nid_t nid)
1879 {
1880 struct f2fs_nm_info *nm_i = NM_I(sbi);
1881 struct free_nid *i;
1882
1883 spin_lock(&nm_i->free_nid_list_lock);
1884 i = __lookup_free_nid_list(nm_i, nid);
1885 f2fs_bug_on(sbi, !i || i->state != NID_ALLOC);
1886 __del_from_free_nid_list(nm_i, i);
1887 spin_unlock(&nm_i->free_nid_list_lock);
1888
1889 kmem_cache_free(free_nid_slab, i);
1890 }
1891
1892 /*
1893 * alloc_nid() should be called prior to this function.
1894 */
1895 void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
1896 {
1897 struct f2fs_nm_info *nm_i = NM_I(sbi);
1898 struct free_nid *i;
1899 bool need_free = false;
1900
1901 if (!nid)
1902 return;
1903
1904 spin_lock(&nm_i->free_nid_list_lock);
1905 i = __lookup_free_nid_list(nm_i, nid);
1906 f2fs_bug_on(sbi, !i || i->state != NID_ALLOC);
1907 if (!available_free_memory(sbi, FREE_NIDS)) {
1908 __del_from_free_nid_list(nm_i, i);
1909 need_free = true;
1910 } else {
1911 i->state = NID_NEW;
1912 nm_i->fcnt++;
1913 }
1914 spin_unlock(&nm_i->free_nid_list_lock);
1915
1916 if (need_free)
1917 kmem_cache_free(free_nid_slab, i);
1918 }
1919
1920 int try_to_free_nids(struct f2fs_sb_info *sbi, int nr_shrink)
1921 {
1922 struct f2fs_nm_info *nm_i = NM_I(sbi);
1923 struct free_nid *i, *next;
1924 int nr = nr_shrink;
1925
1926 if (!mutex_trylock(&nm_i->build_lock))
1927 return 0;
1928
1929 spin_lock(&nm_i->free_nid_list_lock);
1930 list_for_each_entry_safe(i, next, &nm_i->free_nid_list, list) {
1931 if (nr_shrink <= 0 || nm_i->fcnt <= NAT_ENTRY_PER_BLOCK)
1932 break;
1933 if (i->state == NID_ALLOC)
1934 continue;
1935 __del_from_free_nid_list(nm_i, i);
1936 kmem_cache_free(free_nid_slab, i);
1937 nm_i->fcnt--;
1938 nr_shrink--;
1939 }
1940 spin_unlock(&nm_i->free_nid_list_lock);
1941 mutex_unlock(&nm_i->build_lock);
1942
1943 return nr - nr_shrink;
1944 }
1945
1946 void recover_inline_xattr(struct inode *inode, struct page *page)
1947 {
1948 void *src_addr, *dst_addr;
1949 size_t inline_size;
1950 struct page *ipage;
1951 struct f2fs_inode *ri;
1952
1953 ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
1954 f2fs_bug_on(F2FS_I_SB(inode), IS_ERR(ipage));
1955
1956 ri = F2FS_INODE(page);
1957 if (!(ri->i_inline & F2FS_INLINE_XATTR)) {
1958 clear_inode_flag(F2FS_I(inode), FI_INLINE_XATTR);
1959 goto update_inode;
1960 }
1961
1962 dst_addr = inline_xattr_addr(ipage);
1963 src_addr = inline_xattr_addr(page);
1964 inline_size = inline_xattr_size(inode);
1965
1966 f2fs_wait_on_page_writeback(ipage, NODE, true);
1967 memcpy(dst_addr, src_addr, inline_size);
1968 update_inode:
1969 update_inode(inode, ipage);
1970 f2fs_put_page(ipage, 1);
1971 }
1972
1973 void recover_xattr_data(struct inode *inode, struct page *page, block_t blkaddr)
1974 {
1975 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
1976 nid_t prev_xnid = F2FS_I(inode)->i_xattr_nid;
1977 nid_t new_xnid = nid_of_node(page);
1978 struct node_info ni;
1979
1980 /* 1: invalidate the previous xattr nid */
1981 if (!prev_xnid)
1982 goto recover_xnid;
1983
1984 /* Deallocate node address */
1985 get_node_info(sbi, prev_xnid, &ni);
1986 f2fs_bug_on(sbi, ni.blk_addr == NULL_ADDR);
1987 invalidate_blocks(sbi, ni.blk_addr);
1988 dec_valid_node_count(sbi, inode);
1989 set_node_addr(sbi, &ni, NULL_ADDR, false);
1990
1991 recover_xnid:
1992 /* 2: allocate new xattr nid */
1993 if (unlikely(!inc_valid_node_count(sbi, inode)))
1994 f2fs_bug_on(sbi, 1);
1995
1996 remove_free_nid(NM_I(sbi), new_xnid);
1997 get_node_info(sbi, new_xnid, &ni);
1998 ni.ino = inode->i_ino;
1999 set_node_addr(sbi, &ni, NEW_ADDR, false);
2000 F2FS_I(inode)->i_xattr_nid = new_xnid;
2001
2002 /* 3: update xattr blkaddr */
2003 refresh_sit_entry(sbi, NEW_ADDR, blkaddr);
2004 set_node_addr(sbi, &ni, blkaddr, false);
2005
2006 update_inode_page(inode);
2007 }
2008
2009 int recover_inode_page(struct f2fs_sb_info *sbi, struct page *page)
2010 {
2011 struct f2fs_inode *src, *dst;
2012 nid_t ino = ino_of_node(page);
2013 struct node_info old_ni, new_ni;
2014 struct page *ipage;
2015
2016 get_node_info(sbi, ino, &old_ni);
2017
2018 if (unlikely(old_ni.blk_addr != NULL_ADDR))
2019 return -EINVAL;
2020
2021 ipage = f2fs_grab_cache_page(NODE_MAPPING(sbi), ino, false);
2022 if (!ipage)
2023 return -ENOMEM;
2024
2025 /* Should not use this inode from free nid list */
2026 remove_free_nid(NM_I(sbi), ino);
2027
2028 SetPageUptodate(ipage);
2029 fill_node_footer(ipage, ino, ino, 0, true);
2030
2031 src = F2FS_INODE(page);
2032 dst = F2FS_INODE(ipage);
2033
2034 memcpy(dst, src, (unsigned long)&src->i_ext - (unsigned long)src);
2035 dst->i_size = 0;
2036 dst->i_blocks = cpu_to_le64(1);
2037 dst->i_links = cpu_to_le32(1);
2038 dst->i_xattr_nid = 0;
2039 dst->i_inline = src->i_inline & F2FS_INLINE_XATTR;
2040
2041 new_ni = old_ni;
2042 new_ni.ino = ino;
2043
2044 if (unlikely(!inc_valid_node_count(sbi, NULL)))
2045 WARN_ON(1);
2046 set_node_addr(sbi, &new_ni, NEW_ADDR, false);
2047 inc_valid_inode_count(sbi);
2048 set_page_dirty(ipage);
2049 f2fs_put_page(ipage, 1);
2050 return 0;
2051 }
2052
2053 int restore_node_summary(struct f2fs_sb_info *sbi,
2054 unsigned int segno, struct f2fs_summary_block *sum)
2055 {
2056 struct f2fs_node *rn;
2057 struct f2fs_summary *sum_entry;
2058 block_t addr;
2059 int bio_blocks = MAX_BIO_BLOCKS(sbi);
2060 int i, idx, last_offset, nrpages;
2061
2062 /* scan the node segment */
2063 last_offset = sbi->blocks_per_seg;
2064 addr = START_BLOCK(sbi, segno);
2065 sum_entry = &sum->entries[0];
2066
2067 for (i = 0; i < last_offset; i += nrpages, addr += nrpages) {
2068 nrpages = min(last_offset - i, bio_blocks);
2069
2070 /* readahead node pages */
2071 ra_meta_pages(sbi, addr, nrpages, META_POR, true);
2072
2073 for (idx = addr; idx < addr + nrpages; idx++) {
2074 struct page *page = get_tmp_page(sbi, idx);
2075
2076 rn = F2FS_NODE(page);
2077 sum_entry->nid = rn->footer.nid;
2078 sum_entry->version = 0;
2079 sum_entry->ofs_in_node = 0;
2080 sum_entry++;
2081 f2fs_put_page(page, 1);
2082 }
2083
2084 invalidate_mapping_pages(META_MAPPING(sbi), addr,
2085 addr + nrpages);
2086 }
2087 return 0;
2088 }
2089
2090 static void remove_nats_in_journal(struct f2fs_sb_info *sbi)
2091 {
2092 struct f2fs_nm_info *nm_i = NM_I(sbi);
2093 struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
2094 struct f2fs_journal *journal = curseg->journal;
2095 int i;
2096
2097 down_write(&curseg->journal_rwsem);
2098 for (i = 0; i < nats_in_cursum(journal); i++) {
2099 struct nat_entry *ne;
2100 struct f2fs_nat_entry raw_ne;
2101 nid_t nid = le32_to_cpu(nid_in_journal(journal, i));
2102
2103 raw_ne = nat_in_journal(journal, i);
2104
2105 ne = __lookup_nat_cache(nm_i, nid);
2106 if (!ne) {
2107 ne = grab_nat_entry(nm_i, nid);
2108 node_info_from_raw_nat(&ne->ni, &raw_ne);
2109 }
2110 __set_nat_cache_dirty(nm_i, ne);
2111 }
2112 update_nats_in_cursum(journal, -i);
2113 up_write(&curseg->journal_rwsem);
2114 }
2115
2116 static void __adjust_nat_entry_set(struct nat_entry_set *nes,
2117 struct list_head *head, int max)
2118 {
2119 struct nat_entry_set *cur;
2120
2121 if (nes->entry_cnt >= max)
2122 goto add_out;
2123
2124 list_for_each_entry(cur, head, set_list) {
2125 if (cur->entry_cnt >= nes->entry_cnt) {
2126 list_add(&nes->set_list, cur->set_list.prev);
2127 return;
2128 }
2129 }
2130 add_out:
2131 list_add_tail(&nes->set_list, head);
2132 }
2133
2134 static void __flush_nat_entry_set(struct f2fs_sb_info *sbi,
2135 struct nat_entry_set *set)
2136 {
2137 struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
2138 struct f2fs_journal *journal = curseg->journal;
2139 nid_t start_nid = set->set * NAT_ENTRY_PER_BLOCK;
2140 bool to_journal = true;
2141 struct f2fs_nat_block *nat_blk;
2142 struct nat_entry *ne, *cur;
2143 struct page *page = NULL;
2144
2145 /*
2146 * there are two steps to flush nat entries:
2147 * #1, flush nat entries to journal in current hot data summary block.
2148 * #2, flush nat entries to nat page.
2149 */
2150 if (!__has_cursum_space(journal, set->entry_cnt, NAT_JOURNAL))
2151 to_journal = false;
2152
2153 if (to_journal) {
2154 down_write(&curseg->journal_rwsem);
2155 } else {
2156 page = get_next_nat_page(sbi, start_nid);
2157 nat_blk = page_address(page);
2158 f2fs_bug_on(sbi, !nat_blk);
2159 }
2160
2161 /* flush dirty nats in nat entry set */
2162 list_for_each_entry_safe(ne, cur, &set->entry_list, list) {
2163 struct f2fs_nat_entry *raw_ne;
2164 nid_t nid = nat_get_nid(ne);
2165 int offset;
2166
2167 if (nat_get_blkaddr(ne) == NEW_ADDR)
2168 continue;
2169
2170 if (to_journal) {
2171 offset = lookup_journal_in_cursum(journal,
2172 NAT_JOURNAL, nid, 1);
2173 f2fs_bug_on(sbi, offset < 0);
2174 raw_ne = &nat_in_journal(journal, offset);
2175 nid_in_journal(journal, offset) = cpu_to_le32(nid);
2176 } else {
2177 raw_ne = &nat_blk->entries[nid - start_nid];
2178 }
2179 raw_nat_from_node_info(raw_ne, &ne->ni);
2180 nat_reset_flag(ne);
2181 __clear_nat_cache_dirty(NM_I(sbi), ne);
2182 if (nat_get_blkaddr(ne) == NULL_ADDR)
2183 add_free_nid(sbi, nid, false);
2184 }
2185
2186 if (to_journal)
2187 up_write(&curseg->journal_rwsem);
2188 else
2189 f2fs_put_page(page, 1);
2190
2191 f2fs_bug_on(sbi, set->entry_cnt);
2192
2193 radix_tree_delete(&NM_I(sbi)->nat_set_root, set->set);
2194 kmem_cache_free(nat_entry_set_slab, set);
2195 }
2196
2197 /*
2198 * This function is called during the checkpointing process.
2199 */
2200 void flush_nat_entries(struct f2fs_sb_info *sbi)
2201 {
2202 struct f2fs_nm_info *nm_i = NM_I(sbi);
2203 struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
2204 struct f2fs_journal *journal = curseg->journal;
2205 struct nat_entry_set *setvec[SETVEC_SIZE];
2206 struct nat_entry_set *set, *tmp;
2207 unsigned int found;
2208 nid_t set_idx = 0;
2209 LIST_HEAD(sets);
2210
2211 if (!nm_i->dirty_nat_cnt)
2212 return;
2213
2214 down_write(&nm_i->nat_tree_lock);
2215
2216 /*
2217 * if there are no enough space in journal to store dirty nat
2218 * entries, remove all entries from journal and merge them
2219 * into nat entry set.
2220 */
2221 if (!__has_cursum_space(journal, nm_i->dirty_nat_cnt, NAT_JOURNAL))
2222 remove_nats_in_journal(sbi);
2223
2224 while ((found = __gang_lookup_nat_set(nm_i,
2225 set_idx, SETVEC_SIZE, setvec))) {
2226 unsigned idx;
2227 set_idx = setvec[found - 1]->set + 1;
2228 for (idx = 0; idx < found; idx++)
2229 __adjust_nat_entry_set(setvec[idx], &sets,
2230 MAX_NAT_JENTRIES(journal));
2231 }
2232
2233 /* flush dirty nats in nat entry set */
2234 list_for_each_entry_safe(set, tmp, &sets, set_list)
2235 __flush_nat_entry_set(sbi, set);
2236
2237 up_write(&nm_i->nat_tree_lock);
2238
2239 f2fs_bug_on(sbi, nm_i->dirty_nat_cnt);
2240 }
2241
2242 static int init_node_manager(struct f2fs_sb_info *sbi)
2243 {
2244 struct f2fs_super_block *sb_raw = F2FS_RAW_SUPER(sbi);
2245 struct f2fs_nm_info *nm_i = NM_I(sbi);
2246 unsigned char *version_bitmap;
2247 unsigned int nat_segs, nat_blocks;
2248
2249 nm_i->nat_blkaddr = le32_to_cpu(sb_raw->nat_blkaddr);
2250
2251 /* segment_count_nat includes pair segment so divide to 2. */
2252 nat_segs = le32_to_cpu(sb_raw->segment_count_nat) >> 1;
2253 nat_blocks = nat_segs << le32_to_cpu(sb_raw->log_blocks_per_seg);
2254
2255 nm_i->max_nid = NAT_ENTRY_PER_BLOCK * nat_blocks;
2256
2257 /* not used nids: 0, node, meta, (and root counted as valid node) */
2258 nm_i->available_nids = nm_i->max_nid - F2FS_RESERVED_NODE_NUM;
2259 nm_i->fcnt = 0;
2260 nm_i->nat_cnt = 0;
2261 nm_i->ram_thresh = DEF_RAM_THRESHOLD;
2262 nm_i->ra_nid_pages = DEF_RA_NID_PAGES;
2263 nm_i->dirty_nats_ratio = DEF_DIRTY_NAT_RATIO_THRESHOLD;
2264
2265 INIT_RADIX_TREE(&nm_i->free_nid_root, GFP_ATOMIC);
2266 INIT_LIST_HEAD(&nm_i->free_nid_list);
2267 INIT_RADIX_TREE(&nm_i->nat_root, GFP_NOIO);
2268 INIT_RADIX_TREE(&nm_i->nat_set_root, GFP_NOIO);
2269 INIT_LIST_HEAD(&nm_i->nat_entries);
2270
2271 mutex_init(&nm_i->build_lock);
2272 spin_lock_init(&nm_i->free_nid_list_lock);
2273 init_rwsem(&nm_i->nat_tree_lock);
2274
2275 nm_i->next_scan_nid = le32_to_cpu(sbi->ckpt->next_free_nid);
2276 nm_i->bitmap_size = __bitmap_size(sbi, NAT_BITMAP);
2277 version_bitmap = __bitmap_ptr(sbi, NAT_BITMAP);
2278 if (!version_bitmap)
2279 return -EFAULT;
2280
2281 nm_i->nat_bitmap = kmemdup(version_bitmap, nm_i->bitmap_size,
2282 GFP_KERNEL);
2283 if (!nm_i->nat_bitmap)
2284 return -ENOMEM;
2285 return 0;
2286 }
2287
2288 int build_node_manager(struct f2fs_sb_info *sbi)
2289 {
2290 int err;
2291
2292 sbi->nm_info = kzalloc(sizeof(struct f2fs_nm_info), GFP_KERNEL);
2293 if (!sbi->nm_info)
2294 return -ENOMEM;
2295
2296 err = init_node_manager(sbi);
2297 if (err)
2298 return err;
2299
2300 build_free_nids(sbi);
2301 return 0;
2302 }
2303
2304 void destroy_node_manager(struct f2fs_sb_info *sbi)
2305 {
2306 struct f2fs_nm_info *nm_i = NM_I(sbi);
2307 struct free_nid *i, *next_i;
2308 struct nat_entry *natvec[NATVEC_SIZE];
2309 struct nat_entry_set *setvec[SETVEC_SIZE];
2310 nid_t nid = 0;
2311 unsigned int found;
2312
2313 if (!nm_i)
2314 return;
2315
2316 /* destroy free nid list */
2317 spin_lock(&nm_i->free_nid_list_lock);
2318 list_for_each_entry_safe(i, next_i, &nm_i->free_nid_list, list) {
2319 f2fs_bug_on(sbi, i->state == NID_ALLOC);
2320 __del_from_free_nid_list(nm_i, i);
2321 nm_i->fcnt--;
2322 spin_unlock(&nm_i->free_nid_list_lock);
2323 kmem_cache_free(free_nid_slab, i);
2324 spin_lock(&nm_i->free_nid_list_lock);
2325 }
2326 f2fs_bug_on(sbi, nm_i->fcnt);
2327 spin_unlock(&nm_i->free_nid_list_lock);
2328
2329 /* destroy nat cache */
2330 down_write(&nm_i->nat_tree_lock);
2331 while ((found = __gang_lookup_nat_cache(nm_i,
2332 nid, NATVEC_SIZE, natvec))) {
2333 unsigned idx;
2334
2335 nid = nat_get_nid(natvec[found - 1]) + 1;
2336 for (idx = 0; idx < found; idx++)
2337 __del_from_nat_cache(nm_i, natvec[idx]);
2338 }
2339 f2fs_bug_on(sbi, nm_i->nat_cnt);
2340
2341 /* destroy nat set cache */
2342 nid = 0;
2343 while ((found = __gang_lookup_nat_set(nm_i,
2344 nid, SETVEC_SIZE, setvec))) {
2345 unsigned idx;
2346
2347 nid = setvec[found - 1]->set + 1;
2348 for (idx = 0; idx < found; idx++) {
2349 /* entry_cnt is not zero, when cp_error was occurred */
2350 f2fs_bug_on(sbi, !list_empty(&setvec[idx]->entry_list));
2351 radix_tree_delete(&nm_i->nat_set_root, setvec[idx]->set);
2352 kmem_cache_free(nat_entry_set_slab, setvec[idx]);
2353 }
2354 }
2355 up_write(&nm_i->nat_tree_lock);
2356
2357 kfree(nm_i->nat_bitmap);
2358 sbi->nm_info = NULL;
2359 kfree(nm_i);
2360 }
2361
2362 int __init create_node_manager_caches(void)
2363 {
2364 nat_entry_slab = f2fs_kmem_cache_create("nat_entry",
2365 sizeof(struct nat_entry));
2366 if (!nat_entry_slab)
2367 goto fail;
2368
2369 free_nid_slab = f2fs_kmem_cache_create("free_nid",
2370 sizeof(struct free_nid));
2371 if (!free_nid_slab)
2372 goto destroy_nat_entry;
2373
2374 nat_entry_set_slab = f2fs_kmem_cache_create("nat_entry_set",
2375 sizeof(struct nat_entry_set));
2376 if (!nat_entry_set_slab)
2377 goto destroy_free_nid;
2378 return 0;
2379
2380 destroy_free_nid:
2381 kmem_cache_destroy(free_nid_slab);
2382 destroy_nat_entry:
2383 kmem_cache_destroy(nat_entry_slab);
2384 fail:
2385 return -ENOMEM;
2386 }
2387
2388 void destroy_node_manager_caches(void)
2389 {
2390 kmem_cache_destroy(nat_entry_set_slab);
2391 kmem_cache_destroy(free_nid_slab);
2392 kmem_cache_destroy(nat_entry_slab);
2393 }
Linux kernel - Deliverables
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