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Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[linux-2.6.git] / fs / f2fs / node.c
blob4ac4150d421dc05e6c20812d5fd36dcc910a938a
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/events/f2fs.h>
23
24 static struct kmem_cache *nat_entry_slab;
25 static struct kmem_cache *free_nid_slab;
26
27 static void clear_node_page_dirty(struct page *page)
28 {
29 struct address_space *mapping = page->mapping;
30 struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb);
31 unsigned int long flags;
32
33 if (PageDirty(page)) {
34 spin_lock_irqsave(&mapping->tree_lock, flags);
35 radix_tree_tag_clear(&mapping->page_tree,
36 page_index(page),
37 PAGECACHE_TAG_DIRTY);
38 spin_unlock_irqrestore(&mapping->tree_lock, flags);
39
40 clear_page_dirty_for_io(page);
41 dec_page_count(sbi, F2FS_DIRTY_NODES);
42 }
43 ClearPageUptodate(page);
44 }
45
46 static struct page *get_current_nat_page(struct f2fs_sb_info *sbi, nid_t nid)
47 {
48 pgoff_t index = current_nat_addr(sbi, nid);
49 return get_meta_page(sbi, index);
50 }
51
52 static struct page *get_next_nat_page(struct f2fs_sb_info *sbi, nid_t nid)
53 {
54 struct page *src_page;
55 struct page *dst_page;
56 pgoff_t src_off;
57 pgoff_t dst_off;
58 void *src_addr;
59 void *dst_addr;
60 struct f2fs_nm_info *nm_i = NM_I(sbi);
61
62 src_off = current_nat_addr(sbi, nid);
63 dst_off = next_nat_addr(sbi, src_off);
64
65 /* get current nat block page with lock */
66 src_page = get_meta_page(sbi, src_off);
67
68 /* Dirty src_page means that it is already the new target NAT page. */
69 if (PageDirty(src_page))
70 return src_page;
71
72 dst_page = grab_meta_page(sbi, dst_off);
73
74 src_addr = page_address(src_page);
75 dst_addr = page_address(dst_page);
76 memcpy(dst_addr, src_addr, PAGE_CACHE_SIZE);
77 set_page_dirty(dst_page);
78 f2fs_put_page(src_page, 1);
79
80 set_to_next_nat(nm_i, nid);
81
82 return dst_page;
83 }
84
85 /*
86 * Readahead NAT pages
87 */
88 static void ra_nat_pages(struct f2fs_sb_info *sbi, int nid)
89 {
90 struct address_space *mapping = sbi->meta_inode->i_mapping;
91 struct f2fs_nm_info *nm_i = NM_I(sbi);
92 struct blk_plug plug;
93 struct page *page;
94 pgoff_t index;
95 int i;
96
97 blk_start_plug(&plug);
98
99 for (i = 0; i < FREE_NID_PAGES; i++, nid += NAT_ENTRY_PER_BLOCK) {
100 if (nid >= nm_i->max_nid)
101 nid = 0;
102 index = current_nat_addr(sbi, nid);
103
104 page = grab_cache_page(mapping, index);
105 if (!page)
106 continue;
107 if (PageUptodate(page)) {
108 f2fs_put_page(page, 1);
109 continue;
110 }
111 if (f2fs_readpage(sbi, page, index, READ))
112 continue;
113
114 f2fs_put_page(page, 0);
115 }
116 blk_finish_plug(&plug);
117 }
118
119 static struct nat_entry *__lookup_nat_cache(struct f2fs_nm_info *nm_i, nid_t n)
120 {
121 return radix_tree_lookup(&nm_i->nat_root, n);
122 }
123
124 static unsigned int __gang_lookup_nat_cache(struct f2fs_nm_info *nm_i,
125 nid_t start, unsigned int nr, struct nat_entry **ep)
126 {
127 return radix_tree_gang_lookup(&nm_i->nat_root, (void **)ep, start, nr);
128 }
129
130 static void __del_from_nat_cache(struct f2fs_nm_info *nm_i, struct nat_entry *e)
131 {
132 list_del(&e->list);
133 radix_tree_delete(&nm_i->nat_root, nat_get_nid(e));
134 nm_i->nat_cnt--;
135 kmem_cache_free(nat_entry_slab, e);
136 }
137
138 int is_checkpointed_node(struct f2fs_sb_info *sbi, nid_t nid)
139 {
140 struct f2fs_nm_info *nm_i = NM_I(sbi);
141 struct nat_entry *e;
142 int is_cp = 1;
143
144 read_lock(&nm_i->nat_tree_lock);
145 e = __lookup_nat_cache(nm_i, nid);
146 if (e && !e->checkpointed)
147 is_cp = 0;
148 read_unlock(&nm_i->nat_tree_lock);
149 return is_cp;
150 }
151
152 static struct nat_entry *grab_nat_entry(struct f2fs_nm_info *nm_i, nid_t nid)
153 {
154 struct nat_entry *new;
155
156 new = kmem_cache_alloc(nat_entry_slab, GFP_ATOMIC);
157 if (!new)
158 return NULL;
159 if (radix_tree_insert(&nm_i->nat_root, nid, new)) {
160 kmem_cache_free(nat_entry_slab, new);
161 return NULL;
162 }
163 memset(new, 0, sizeof(struct nat_entry));
164 nat_set_nid(new, nid);
165 list_add_tail(&new->list, &nm_i->nat_entries);
166 nm_i->nat_cnt++;
167 return new;
168 }
169
170 static void cache_nat_entry(struct f2fs_nm_info *nm_i, nid_t nid,
171 struct f2fs_nat_entry *ne)
172 {
173 struct nat_entry *e;
174 retry:
175 write_lock(&nm_i->nat_tree_lock);
176 e = __lookup_nat_cache(nm_i, nid);
177 if (!e) {
178 e = grab_nat_entry(nm_i, nid);
179 if (!e) {
180 write_unlock(&nm_i->nat_tree_lock);
181 goto retry;
182 }
183 nat_set_blkaddr(e, le32_to_cpu(ne->block_addr));
184 nat_set_ino(e, le32_to_cpu(ne->ino));
185 nat_set_version(e, ne->version);
186 e->checkpointed = true;
187 }
188 write_unlock(&nm_i->nat_tree_lock);
189 }
190
191 static void set_node_addr(struct f2fs_sb_info *sbi, struct node_info *ni,
192 block_t new_blkaddr)
193 {
194 struct f2fs_nm_info *nm_i = NM_I(sbi);
195 struct nat_entry *e;
196 retry:
197 write_lock(&nm_i->nat_tree_lock);
198 e = __lookup_nat_cache(nm_i, ni->nid);
199 if (!e) {
200 e = grab_nat_entry(nm_i, ni->nid);
201 if (!e) {
202 write_unlock(&nm_i->nat_tree_lock);
203 goto retry;
204 }
205 e->ni = *ni;
206 e->checkpointed = true;
207 f2fs_bug_on(ni->blk_addr == NEW_ADDR);
208 } else if (new_blkaddr == NEW_ADDR) {
209 /*
210 * when nid is reallocated,
211 * previous nat entry can be remained in nat cache.
212 * So, reinitialize it with new information.
213 */
214 e->ni = *ni;
215 f2fs_bug_on(ni->blk_addr != NULL_ADDR);
216 }
217
218 if (new_blkaddr == NEW_ADDR)
219 e->checkpointed = false;
220
221 /* sanity check */
222 f2fs_bug_on(nat_get_blkaddr(e) != ni->blk_addr);
223 f2fs_bug_on(nat_get_blkaddr(e) == NULL_ADDR &&
224 new_blkaddr == NULL_ADDR);
225 f2fs_bug_on(nat_get_blkaddr(e) == NEW_ADDR &&
226 new_blkaddr == NEW_ADDR);
227 f2fs_bug_on(nat_get_blkaddr(e) != NEW_ADDR &&
228 nat_get_blkaddr(e) != NULL_ADDR &&
229 new_blkaddr == NEW_ADDR);
230
231 /* increament version no as node is removed */
232 if (nat_get_blkaddr(e) != NEW_ADDR && new_blkaddr == NULL_ADDR) {
233 unsigned char version = nat_get_version(e);
234 nat_set_version(e, inc_node_version(version));
235 }
236
237 /* change address */
238 nat_set_blkaddr(e, new_blkaddr);
239 __set_nat_cache_dirty(nm_i, e);
240 write_unlock(&nm_i->nat_tree_lock);
241 }
242
243 int try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink)
244 {
245 struct f2fs_nm_info *nm_i = NM_I(sbi);
246
247 if (nm_i->nat_cnt <= NM_WOUT_THRESHOLD)
248 return 0;
249
250 write_lock(&nm_i->nat_tree_lock);
251 while (nr_shrink && !list_empty(&nm_i->nat_entries)) {
252 struct nat_entry *ne;
253 ne = list_first_entry(&nm_i->nat_entries,
254 struct nat_entry, list);
255 __del_from_nat_cache(nm_i, ne);
256 nr_shrink--;
257 }
258 write_unlock(&nm_i->nat_tree_lock);
259 return nr_shrink;
260 }
261
262 /*
263 * This function returns always success
264 */
265 void get_node_info(struct f2fs_sb_info *sbi, nid_t nid, struct node_info *ni)
266 {
267 struct f2fs_nm_info *nm_i = NM_I(sbi);
268 struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
269 struct f2fs_summary_block *sum = curseg->sum_blk;
270 nid_t start_nid = START_NID(nid);
271 struct f2fs_nat_block *nat_blk;
272 struct page *page = NULL;
273 struct f2fs_nat_entry ne;
274 struct nat_entry *e;
275 int i;
276
277 memset(&ne, 0, sizeof(struct f2fs_nat_entry));
278 ni->nid = nid;
279
280 /* Check nat cache */
281 read_lock(&nm_i->nat_tree_lock);
282 e = __lookup_nat_cache(nm_i, nid);
283 if (e) {
284 ni->ino = nat_get_ino(e);
285 ni->blk_addr = nat_get_blkaddr(e);
286 ni->version = nat_get_version(e);
287 }
288 read_unlock(&nm_i->nat_tree_lock);
289 if (e)
290 return;
291
292 /* Check current segment summary */
293 mutex_lock(&curseg->curseg_mutex);
294 i = lookup_journal_in_cursum(sum, NAT_JOURNAL, nid, 0);
295 if (i >= 0) {
296 ne = nat_in_journal(sum, i);
297 node_info_from_raw_nat(ni, &ne);
298 }
299 mutex_unlock(&curseg->curseg_mutex);
300 if (i >= 0)
301 goto cache;
302
303 /* Fill node_info from nat page */
304 page = get_current_nat_page(sbi, start_nid);
305 nat_blk = (struct f2fs_nat_block *)page_address(page);
306 ne = nat_blk->entries[nid - start_nid];
307 node_info_from_raw_nat(ni, &ne);
308 f2fs_put_page(page, 1);
309 cache:
310 /* cache nat entry */
311 cache_nat_entry(NM_I(sbi), nid, &ne);
312 }
313
314 /*
315 * The maximum depth is four.
316 * Offset[0] will have raw inode offset.
317 */
318 static int get_node_path(struct f2fs_inode_info *fi, long block,
319 int offset[4], unsigned int noffset[4])
320 {
321 const long direct_index = ADDRS_PER_INODE(fi);
322 const long direct_blks = ADDRS_PER_BLOCK;
323 const long dptrs_per_blk = NIDS_PER_BLOCK;
324 const long indirect_blks = ADDRS_PER_BLOCK * NIDS_PER_BLOCK;
325 const long dindirect_blks = indirect_blks * NIDS_PER_BLOCK;
326 int n = 0;
327 int level = 0;
328
329 noffset[0] = 0;
330
331 if (block < direct_index) {
332 offset[n] = block;
333 goto got;
334 }
335 block -= direct_index;
336 if (block < direct_blks) {
337 offset[n++] = NODE_DIR1_BLOCK;
338 noffset[n] = 1;
339 offset[n] = block;
340 level = 1;
341 goto got;
342 }
343 block -= direct_blks;
344 if (block < direct_blks) {
345 offset[n++] = NODE_DIR2_BLOCK;
346 noffset[n] = 2;
347 offset[n] = block;
348 level = 1;
349 goto got;
350 }
351 block -= direct_blks;
352 if (block < indirect_blks) {
353 offset[n++] = NODE_IND1_BLOCK;
354 noffset[n] = 3;
355 offset[n++] = block / direct_blks;
356 noffset[n] = 4 + offset[n - 1];
357 offset[n] = block % direct_blks;
358 level = 2;
359 goto got;
360 }
361 block -= indirect_blks;
362 if (block < indirect_blks) {
363 offset[n++] = NODE_IND2_BLOCK;
364 noffset[n] = 4 + dptrs_per_blk;
365 offset[n++] = block / direct_blks;
366 noffset[n] = 5 + dptrs_per_blk + offset[n - 1];
367 offset[n] = block % direct_blks;
368 level = 2;
369 goto got;
370 }
371 block -= indirect_blks;
372 if (block < dindirect_blks) {
373 offset[n++] = NODE_DIND_BLOCK;
374 noffset[n] = 5 + (dptrs_per_blk * 2);
375 offset[n++] = block / indirect_blks;
376 noffset[n] = 6 + (dptrs_per_blk * 2) +
377 offset[n - 1] * (dptrs_per_blk + 1);
378 offset[n++] = (block / direct_blks) % dptrs_per_blk;
379 noffset[n] = 7 + (dptrs_per_blk * 2) +
380 offset[n - 2] * (dptrs_per_blk + 1) +
381 offset[n - 1];
382 offset[n] = block % direct_blks;
383 level = 3;
384 goto got;
385 } else {
386 BUG();
387 }
388 got:
389 return level;
390 }
391
392 /*
393 * Caller should call f2fs_put_dnode(dn).
394 * Also, it should grab and release a mutex by calling mutex_lock_op() and
395 * mutex_unlock_op() only if ro is not set RDONLY_NODE.
396 * In the case of RDONLY_NODE, we don't need to care about mutex.
397 */
398 int get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode)
399 {
400 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
401 struct page *npage[4];
402 struct page *parent;
403 int offset[4];
404 unsigned int noffset[4];
405 nid_t nids[4];
406 int level, i;
407 int err = 0;
408
409 level = get_node_path(F2FS_I(dn->inode), index, offset, noffset);
410
411 nids[0] = dn->inode->i_ino;
412 npage[0] = dn->inode_page;
413
414 if (!npage[0]) {
415 npage[0] = get_node_page(sbi, nids[0]);
416 if (IS_ERR(npage[0]))
417 return PTR_ERR(npage[0]);
418 }
419 parent = npage[0];
420 if (level != 0)
421 nids[1] = get_nid(parent, offset[0], true);
422 dn->inode_page = npage[0];
423 dn->inode_page_locked = true;
424
425 /* get indirect or direct nodes */
426 for (i = 1; i <= level; i++) {
427 bool done = false;
428
429 if (!nids[i] && mode == ALLOC_NODE) {
430 /* alloc new node */
431 if (!alloc_nid(sbi, &(nids[i]))) {
432 err = -ENOSPC;
433 goto release_pages;
434 }
435
436 dn->nid = nids[i];
437 npage[i] = new_node_page(dn, noffset[i], NULL);
438 if (IS_ERR(npage[i])) {
439 alloc_nid_failed(sbi, nids[i]);
440 err = PTR_ERR(npage[i]);
441 goto release_pages;
442 }
443
444 set_nid(parent, offset[i - 1], nids[i], i == 1);
445 alloc_nid_done(sbi, nids[i]);
446 done = true;
447 } else if (mode == LOOKUP_NODE_RA && i == level && level > 1) {
448 npage[i] = get_node_page_ra(parent, offset[i - 1]);
449 if (IS_ERR(npage[i])) {
450 err = PTR_ERR(npage[i]);
451 goto release_pages;
452 }
453 done = true;
454 }
455 if (i == 1) {
456 dn->inode_page_locked = false;
457 unlock_page(parent);
458 } else {
459 f2fs_put_page(parent, 1);
460 }
461
462 if (!done) {
463 npage[i] = get_node_page(sbi, nids[i]);
464 if (IS_ERR(npage[i])) {
465 err = PTR_ERR(npage[i]);
466 f2fs_put_page(npage[0], 0);
467 goto release_out;
468 }
469 }
470 if (i < level) {
471 parent = npage[i];
472 nids[i + 1] = get_nid(parent, offset[i], false);
473 }
474 }
475 dn->nid = nids[level];
476 dn->ofs_in_node = offset[level];
477 dn->node_page = npage[level];
478 dn->data_blkaddr = datablock_addr(dn->node_page, dn->ofs_in_node);
479 return 0;
480
481 release_pages:
482 f2fs_put_page(parent, 1);
483 if (i > 1)
484 f2fs_put_page(npage[0], 0);
485 release_out:
486 dn->inode_page = NULL;
487 dn->node_page = NULL;
488 return err;
489 }
490
491 static void truncate_node(struct dnode_of_data *dn)
492 {
493 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
494 struct node_info ni;
495
496 get_node_info(sbi, dn->nid, &ni);
497 if (dn->inode->i_blocks == 0) {
498 f2fs_bug_on(ni.blk_addr != NULL_ADDR);
499 goto invalidate;
500 }
501 f2fs_bug_on(ni.blk_addr == NULL_ADDR);
502
503 /* Deallocate node address */
504 invalidate_blocks(sbi, ni.blk_addr);
505 dec_valid_node_count(sbi, dn->inode, 1);
506 set_node_addr(sbi, &ni, NULL_ADDR);
507
508 if (dn->nid == dn->inode->i_ino) {
509 remove_orphan_inode(sbi, dn->nid);
510 dec_valid_inode_count(sbi);
511 } else {
512 sync_inode_page(dn);
513 }
514 invalidate:
515 clear_node_page_dirty(dn->node_page);
516 F2FS_SET_SB_DIRT(sbi);
517
518 f2fs_put_page(dn->node_page, 1);
519 dn->node_page = NULL;
520 trace_f2fs_truncate_node(dn->inode, dn->nid, ni.blk_addr);
521 }
522
523 static int truncate_dnode(struct dnode_of_data *dn)
524 {
525 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
526 struct page *page;
527
528 if (dn->nid == 0)
529 return 1;
530
531 /* get direct node */
532 page = get_node_page(sbi, dn->nid);
533 if (IS_ERR(page) && PTR_ERR(page) == -ENOENT)
534 return 1;
535 else if (IS_ERR(page))
536 return PTR_ERR(page);
537
538 /* Make dnode_of_data for parameter */
539 dn->node_page = page;
540 dn->ofs_in_node = 0;
541 truncate_data_blocks(dn);
542 truncate_node(dn);
543 return 1;
544 }
545
546 static int truncate_nodes(struct dnode_of_data *dn, unsigned int nofs,
547 int ofs, int depth)
548 {
549 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
550 struct dnode_of_data rdn = *dn;
551 struct page *page;
552 struct f2fs_node *rn;
553 nid_t child_nid;
554 unsigned int child_nofs;
555 int freed = 0;
556 int i, ret;
557
558 if (dn->nid == 0)
559 return NIDS_PER_BLOCK + 1;
560
561 trace_f2fs_truncate_nodes_enter(dn->inode, dn->nid, dn->data_blkaddr);
562
563 page = get_node_page(sbi, dn->nid);
564 if (IS_ERR(page)) {
565 trace_f2fs_truncate_nodes_exit(dn->inode, PTR_ERR(page));
566 return PTR_ERR(page);
567 }
568
569 rn = F2FS_NODE(page);
570 if (depth < 3) {
571 for (i = ofs; i < NIDS_PER_BLOCK; i++, freed++) {
572 child_nid = le32_to_cpu(rn->in.nid[i]);
573 if (child_nid == 0)
574 continue;
575 rdn.nid = child_nid;
576 ret = truncate_dnode(&rdn);
577 if (ret < 0)
578 goto out_err;
579 set_nid(page, i, 0, false);
580 }
581 } else {
582 child_nofs = nofs + ofs * (NIDS_PER_BLOCK + 1) + 1;
583 for (i = ofs; i < NIDS_PER_BLOCK; i++) {
584 child_nid = le32_to_cpu(rn->in.nid[i]);
585 if (child_nid == 0) {
586 child_nofs += NIDS_PER_BLOCK + 1;
587 continue;
588 }
589 rdn.nid = child_nid;
590 ret = truncate_nodes(&rdn, child_nofs, 0, depth - 1);
591 if (ret == (NIDS_PER_BLOCK + 1)) {
592 set_nid(page, i, 0, false);
593 child_nofs += ret;
594 } else if (ret < 0 && ret != -ENOENT) {
595 goto out_err;
596 }
597 }
598 freed = child_nofs;
599 }
600
601 if (!ofs) {
602 /* remove current indirect node */
603 dn->node_page = page;
604 truncate_node(dn);
605 freed++;
606 } else {
607 f2fs_put_page(page, 1);
608 }
609 trace_f2fs_truncate_nodes_exit(dn->inode, freed);
610 return freed;
611
612 out_err:
613 f2fs_put_page(page, 1);
614 trace_f2fs_truncate_nodes_exit(dn->inode, ret);
615 return ret;
616 }
617
618 static int truncate_partial_nodes(struct dnode_of_data *dn,
619 struct f2fs_inode *ri, int *offset, int depth)
620 {
621 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
622 struct page *pages[2];
623 nid_t nid[3];
624 nid_t child_nid;
625 int err = 0;
626 int i;
627 int idx = depth - 2;
628
629 nid[0] = le32_to_cpu(ri->i_nid[offset[0] - NODE_DIR1_BLOCK]);
630 if (!nid[0])
631 return 0;
632
633 /* get indirect nodes in the path */
634 for (i = 0; i < depth - 1; i++) {
635 /* refernece count'll be increased */
636 pages[i] = get_node_page(sbi, nid[i]);
637 if (IS_ERR(pages[i])) {
638 depth = i + 1;
639 err = PTR_ERR(pages[i]);
640 goto fail;
641 }
642 nid[i + 1] = get_nid(pages[i], offset[i + 1], false);
643 }
644
645 /* free direct nodes linked to a partial indirect node */
646 for (i = offset[depth - 1]; i < NIDS_PER_BLOCK; i++) {
647 child_nid = get_nid(pages[idx], i, false);
648 if (!child_nid)
649 continue;
650 dn->nid = child_nid;
651 err = truncate_dnode(dn);
652 if (err < 0)
653 goto fail;
654 set_nid(pages[idx], i, 0, false);
655 }
656
657 if (offset[depth - 1] == 0) {
658 dn->node_page = pages[idx];
659 dn->nid = nid[idx];
660 truncate_node(dn);
661 } else {
662 f2fs_put_page(pages[idx], 1);
663 }
664 offset[idx]++;
665 offset[depth - 1] = 0;
666 fail:
667 for (i = depth - 3; i >= 0; i--)
668 f2fs_put_page(pages[i], 1);
669
670 trace_f2fs_truncate_partial_nodes(dn->inode, nid, depth, err);
671
672 return err;
673 }
674
675 /*
676 * All the block addresses of data and nodes should be nullified.
677 */
678 int truncate_inode_blocks(struct inode *inode, pgoff_t from)
679 {
680 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
681 struct address_space *node_mapping = sbi->node_inode->i_mapping;
682 int err = 0, cont = 1;
683 int level, offset[4], noffset[4];
684 unsigned int nofs = 0;
685 struct f2fs_node *rn;
686 struct dnode_of_data dn;
687 struct page *page;
688
689 trace_f2fs_truncate_inode_blocks_enter(inode, from);
690
691 level = get_node_path(F2FS_I(inode), from, offset, noffset);
692 restart:
693 page = get_node_page(sbi, inode->i_ino);
694 if (IS_ERR(page)) {
695 trace_f2fs_truncate_inode_blocks_exit(inode, PTR_ERR(page));
696 return PTR_ERR(page);
697 }
698
699 set_new_dnode(&dn, inode, page, NULL, 0);
700 unlock_page(page);
701
702 rn = F2FS_NODE(page);
703 switch (level) {
704 case 0:
705 case 1:
706 nofs = noffset[1];
707 break;
708 case 2:
709 nofs = noffset[1];
710 if (!offset[level - 1])
711 goto skip_partial;
712 err = truncate_partial_nodes(&dn, &rn->i, offset, level);
713 if (err < 0 && err != -ENOENT)
714 goto fail;
715 nofs += 1 + NIDS_PER_BLOCK;
716 break;
717 case 3:
718 nofs = 5 + 2 * NIDS_PER_BLOCK;
719 if (!offset[level - 1])
720 goto skip_partial;
721 err = truncate_partial_nodes(&dn, &rn->i, offset, level);
722 if (err < 0 && err != -ENOENT)
723 goto fail;
724 break;
725 default:
726 BUG();
727 }
728
729 skip_partial:
730 while (cont) {
731 dn.nid = le32_to_cpu(rn->i.i_nid[offset[0] - NODE_DIR1_BLOCK]);
732 switch (offset[0]) {
733 case NODE_DIR1_BLOCK:
734 case NODE_DIR2_BLOCK:
735 err = truncate_dnode(&dn);
736 break;
737
738 case NODE_IND1_BLOCK:
739 case NODE_IND2_BLOCK:
740 err = truncate_nodes(&dn, nofs, offset[1], 2);
741 break;
742
743 case NODE_DIND_BLOCK:
744 err = truncate_nodes(&dn, nofs, offset[1], 3);
745 cont = 0;
746 break;
747
748 default:
749 BUG();
750 }
751 if (err < 0 && err != -ENOENT)
752 goto fail;
753 if (offset[1] == 0 &&
754 rn->i.i_nid[offset[0] - NODE_DIR1_BLOCK]) {
755 lock_page(page);
756 if (page->mapping != node_mapping) {
757 f2fs_put_page(page, 1);
758 goto restart;
759 }
760 wait_on_page_writeback(page);
761 rn->i.i_nid[offset[0] - NODE_DIR1_BLOCK] = 0;
762 set_page_dirty(page);
763 unlock_page(page);
764 }
765 offset[1] = 0;
766 offset[0]++;
767 nofs += err;
768 }
769 fail:
770 f2fs_put_page(page, 0);
771 trace_f2fs_truncate_inode_blocks_exit(inode, err);
772 return err > 0 ? 0 : err;
773 }
774
775 int truncate_xattr_node(struct inode *inode, struct page *page)
776 {
777 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
778 nid_t nid = F2FS_I(inode)->i_xattr_nid;
779 struct dnode_of_data dn;
780 struct page *npage;
781
782 if (!nid)
783 return 0;
784
785 npage = get_node_page(sbi, nid);
786 if (IS_ERR(npage))
787 return PTR_ERR(npage);
788
789 F2FS_I(inode)->i_xattr_nid = 0;
790
791 /* need to do checkpoint during fsync */
792 F2FS_I(inode)->xattr_ver = cur_cp_version(F2FS_CKPT(sbi));
793
794 set_new_dnode(&dn, inode, page, npage, nid);
795
796 if (page)
797 dn.inode_page_locked = 1;
798 truncate_node(&dn);
799 return 0;
800 }
801
802 /*
803 * Caller should grab and release a mutex by calling mutex_lock_op() and
804 * mutex_unlock_op().
805 */
806 int remove_inode_page(struct inode *inode)
807 {
808 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
809 struct page *page;
810 nid_t ino = inode->i_ino;
811 struct dnode_of_data dn;
812 int err;
813
814 page = get_node_page(sbi, ino);
815 if (IS_ERR(page))
816 return PTR_ERR(page);
817
818 err = truncate_xattr_node(inode, page);
819 if (err) {
820 f2fs_put_page(page, 1);
821 return err;
822 }
823
824 /* 0 is possible, after f2fs_new_inode() is failed */
825 f2fs_bug_on(inode->i_blocks != 0 && inode->i_blocks != 1);
826 set_new_dnode(&dn, inode, page, page, ino);
827 truncate_node(&dn);
828 return 0;
829 }
830
831 struct page *new_inode_page(struct inode *inode, const struct qstr *name)
832 {
833 struct dnode_of_data dn;
834
835 /* allocate inode page for new inode */
836 set_new_dnode(&dn, inode, NULL, NULL, inode->i_ino);
837
838 /* caller should f2fs_put_page(page, 1); */
839 return new_node_page(&dn, 0, NULL);
840 }
841
842 struct page *new_node_page(struct dnode_of_data *dn,
843 unsigned int ofs, struct page *ipage)
844 {
845 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
846 struct address_space *mapping = sbi->node_inode->i_mapping;
847 struct node_info old_ni, new_ni;
848 struct page *page;
849 int err;
850
851 if (is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC))
852 return ERR_PTR(-EPERM);
853
854 page = grab_cache_page(mapping, dn->nid);
855 if (!page)
856 return ERR_PTR(-ENOMEM);
857
858 if (!inc_valid_node_count(sbi, dn->inode, 1)) {
859 err = -ENOSPC;
860 goto fail;
861 }
862
863 get_node_info(sbi, dn->nid, &old_ni);
864
865 /* Reinitialize old_ni with new node page */
866 f2fs_bug_on(old_ni.blk_addr != NULL_ADDR);
867 new_ni = old_ni;
868 new_ni.ino = dn->inode->i_ino;
869 set_node_addr(sbi, &new_ni, NEW_ADDR);
870
871 fill_node_footer(page, dn->nid, dn->inode->i_ino, ofs, true);
872 set_cold_node(dn->inode, page);
873 SetPageUptodate(page);
874 set_page_dirty(page);
875
876 if (ofs == XATTR_NODE_OFFSET)
877 F2FS_I(dn->inode)->i_xattr_nid = dn->nid;
878
879 dn->node_page = page;
880 if (ipage)
881 update_inode(dn->inode, ipage);
882 else
883 sync_inode_page(dn);
884 if (ofs == 0)
885 inc_valid_inode_count(sbi);
886
887 return page;
888
889 fail:
890 clear_node_page_dirty(page);
891 f2fs_put_page(page, 1);
892 return ERR_PTR(err);
893 }
894
895 /*
896 * Caller should do after getting the following values.
897 * 0: f2fs_put_page(page, 0)
898 * LOCKED_PAGE: f2fs_put_page(page, 1)
899 * error: nothing
900 */
901 static int read_node_page(struct page *page, int type)
902 {
903 struct f2fs_sb_info *sbi = F2FS_SB(page->mapping->host->i_sb);
904 struct node_info ni;
905
906 get_node_info(sbi, page->index, &ni);
907
908 if (ni.blk_addr == NULL_ADDR) {
909 f2fs_put_page(page, 1);
910 return -ENOENT;
911 }
912
913 if (PageUptodate(page))
914 return LOCKED_PAGE;
915
916 return f2fs_readpage(sbi, page, ni.blk_addr, type);
917 }
918
919 /*
920 * Readahead a node page
921 */
922 void ra_node_page(struct f2fs_sb_info *sbi, nid_t nid)
923 {
924 struct address_space *mapping = sbi->node_inode->i_mapping;
925 struct page *apage;
926 int err;
927
928 apage = find_get_page(mapping, nid);
929 if (apage && PageUptodate(apage)) {
930 f2fs_put_page(apage, 0);
931 return;
932 }
933 f2fs_put_page(apage, 0);
934
935 apage = grab_cache_page(mapping, nid);
936 if (!apage)
937 return;
938
939 err = read_node_page(apage, READA);
940 if (err == 0)
941 f2fs_put_page(apage, 0);
942 else if (err == LOCKED_PAGE)
943 f2fs_put_page(apage, 1);
944 }
945
946 struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)
947 {
948 struct address_space *mapping = sbi->node_inode->i_mapping;
949 struct page *page;
950 int err;
951 repeat:
952 page = grab_cache_page(mapping, nid);
953 if (!page)
954 return ERR_PTR(-ENOMEM);
955
956 err = read_node_page(page, READ_SYNC);
957 if (err < 0)
958 return ERR_PTR(err);
959 else if (err == LOCKED_PAGE)
960 goto got_it;
961
962 lock_page(page);
963 if (!PageUptodate(page)) {
964 f2fs_put_page(page, 1);
965 return ERR_PTR(-EIO);
966 }
967 if (page->mapping != mapping) {
968 f2fs_put_page(page, 1);
969 goto repeat;
970 }
971 got_it:
972 f2fs_bug_on(nid != nid_of_node(page));
973 mark_page_accessed(page);
974 return page;
975 }
976
977 /*
978 * Return a locked page for the desired node page.
979 * And, readahead MAX_RA_NODE number of node pages.
980 */
981 struct page *get_node_page_ra(struct page *parent, int start)
982 {
983 struct f2fs_sb_info *sbi = F2FS_SB(parent->mapping->host->i_sb);
984 struct address_space *mapping = sbi->node_inode->i_mapping;
985 struct blk_plug plug;
986 struct page *page;
987 int err, i, end;
988 nid_t nid;
989
990 /* First, try getting the desired direct node. */
991 nid = get_nid(parent, start, false);
992 if (!nid)
993 return ERR_PTR(-ENOENT);
994 repeat:
995 page = grab_cache_page(mapping, nid);
996 if (!page)
997 return ERR_PTR(-ENOMEM);
998
999 err = read_node_page(page, READ_SYNC);
1000 if (err < 0)
1001 return ERR_PTR(err);
1002 else if (err == LOCKED_PAGE)
1003 goto page_hit;
1004
1005 blk_start_plug(&plug);
1006
1007 /* Then, try readahead for siblings of the desired node */
1008 end = start + MAX_RA_NODE;
1009 end = min(end, NIDS_PER_BLOCK);
1010 for (i = start + 1; i < end; i++) {
1011 nid = get_nid(parent, i, false);
1012 if (!nid)
1013 continue;
1014 ra_node_page(sbi, nid);
1015 }
1016
1017 blk_finish_plug(&plug);
1018
1019 lock_page(page);
1020 if (page->mapping != mapping) {
1021 f2fs_put_page(page, 1);
1022 goto repeat;
1023 }
1024 page_hit:
1025 if (!PageUptodate(page)) {
1026 f2fs_put_page(page, 1);
1027 return ERR_PTR(-EIO);
1028 }
1029 mark_page_accessed(page);
1030 return page;
1031 }
1032
1033 void sync_inode_page(struct dnode_of_data *dn)
1034 {
1035 if (IS_INODE(dn->node_page) || dn->inode_page == dn->node_page) {
1036 update_inode(dn->inode, dn->node_page);
1037 } else if (dn->inode_page) {
1038 if (!dn->inode_page_locked)
1039 lock_page(dn->inode_page);
1040 update_inode(dn->inode, dn->inode_page);
1041 if (!dn->inode_page_locked)
1042 unlock_page(dn->inode_page);
1043 } else {
1044 update_inode_page(dn->inode);
1045 }
1046 }
1047
1048 int sync_node_pages(struct f2fs_sb_info *sbi, nid_t ino,
1049 struct writeback_control *wbc)
1050 {
1051 struct address_space *mapping = sbi->node_inode->i_mapping;
1052 pgoff_t index, end;
1053 struct pagevec pvec;
1054 int step = ino ? 2 : 0;
1055 int nwritten = 0, wrote = 0;
1056
1057 pagevec_init(&pvec, 0);
1058
1059 next_step:
1060 index = 0;
1061 end = LONG_MAX;
1062
1063 while (index <= end) {
1064 int i, nr_pages;
1065 nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
1066 PAGECACHE_TAG_DIRTY,
1067 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1);
1068 if (nr_pages == 0)
1069 break;
1070
1071 for (i = 0; i < nr_pages; i++) {
1072 struct page *page = pvec.pages[i];
1073
1074 /*
1075 * flushing sequence with step:
1076 * 0. indirect nodes
1077 * 1. dentry dnodes
1078 * 2. file dnodes
1079 */
1080 if (step == 0 && IS_DNODE(page))
1081 continue;
1082 if (step == 1 && (!IS_DNODE(page) ||
1083 is_cold_node(page)))
1084 continue;
1085 if (step == 2 && (!IS_DNODE(page) ||
1086 !is_cold_node(page)))
1087 continue;
1088
1089 /*
1090 * If an fsync mode,
1091 * we should not skip writing node pages.
1092 */
1093 if (ino && ino_of_node(page) == ino)
1094 lock_page(page);
1095 else if (!trylock_page(page))
1096 continue;
1097
1098 if (unlikely(page->mapping != mapping)) {
1099 continue_unlock:
1100 unlock_page(page);
1101 continue;
1102 }
1103 if (ino && ino_of_node(page) != ino)
1104 goto continue_unlock;
1105
1106 if (!PageDirty(page)) {
1107 /* someone wrote it for us */
1108 goto continue_unlock;
1109 }
1110
1111 if (!clear_page_dirty_for_io(page))
1112 goto continue_unlock;
1113
1114 /* called by fsync() */
1115 if (ino && IS_DNODE(page)) {
1116 int mark = !is_checkpointed_node(sbi, ino);
1117 set_fsync_mark(page, 1);
1118 if (IS_INODE(page))
1119 set_dentry_mark(page, mark);
1120 nwritten++;
1121 } else {
1122 set_fsync_mark(page, 0);
1123 set_dentry_mark(page, 0);
1124 }
1125 mapping->a_ops->writepage(page, wbc);
1126 wrote++;
1127
1128 if (--wbc->nr_to_write == 0)
1129 break;
1130 }
1131 pagevec_release(&pvec);
1132 cond_resched();
1133
1134 if (wbc->nr_to_write == 0) {
1135 step = 2;
1136 break;
1137 }
1138 }
1139
1140 if (step < 2) {
1141 step++;
1142 goto next_step;
1143 }
1144
1145 if (wrote)
1146 f2fs_submit_bio(sbi, NODE, wbc->sync_mode == WB_SYNC_ALL);
1147
1148 return nwritten;
1149 }
1150
1151 int wait_on_node_pages_writeback(struct f2fs_sb_info *sbi, nid_t ino)
1152 {
1153 struct address_space *mapping = sbi->node_inode->i_mapping;
1154 pgoff_t index = 0, end = LONG_MAX;
1155 struct pagevec pvec;
1156 int nr_pages;
1157 int ret2 = 0, ret = 0;
1158
1159 pagevec_init(&pvec, 0);
1160 while ((index <= end) &&
1161 (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
1162 PAGECACHE_TAG_WRITEBACK,
1163 min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1)) != 0) {
1164 unsigned i;
1165
1166 for (i = 0; i < nr_pages; i++) {
1167 struct page *page = pvec.pages[i];
1168
1169 /* until radix tree lookup accepts end_index */
1170 if (page->index > end)
1171 continue;
1172
1173 if (ino && ino_of_node(page) == ino) {
1174 wait_on_page_writeback(page);
1175 if (TestClearPageError(page))
1176 ret = -EIO;
1177 }
1178 }
1179 pagevec_release(&pvec);
1180 cond_resched();
1181 }
1182
1183 if (test_and_clear_bit(AS_ENOSPC, &mapping->flags))
1184 ret2 = -ENOSPC;
1185 if (test_and_clear_bit(AS_EIO, &mapping->flags))
1186 ret2 = -EIO;
1187 if (!ret)
1188 ret = ret2;
1189 return ret;
1190 }
1191
1192 static int f2fs_write_node_page(struct page *page,
1193 struct writeback_control *wbc)
1194 {
1195 struct f2fs_sb_info *sbi = F2FS_SB(page->mapping->host->i_sb);
1196 nid_t nid;
1197 block_t new_addr;
1198 struct node_info ni;
1199
1200 if (sbi->por_doing)
1201 goto redirty_out;
1202
1203 wait_on_page_writeback(page);
1204
1205 /* get old block addr of this node page */
1206 nid = nid_of_node(page);
1207 f2fs_bug_on(page->index != nid);
1208
1209 get_node_info(sbi, nid, &ni);
1210
1211 /* This page is already truncated */
1212 if (ni.blk_addr == NULL_ADDR) {
1213 dec_page_count(sbi, F2FS_DIRTY_NODES);
1214 unlock_page(page);
1215 return 0;
1216 }
1217
1218 if (wbc->for_reclaim)
1219 goto redirty_out;
1220
1221 mutex_lock(&sbi->node_write);
1222 set_page_writeback(page);
1223 write_node_page(sbi, page, nid, ni.blk_addr, &new_addr);
1224 set_node_addr(sbi, &ni, new_addr);
1225 dec_page_count(sbi, F2FS_DIRTY_NODES);
1226 mutex_unlock(&sbi->node_write);
1227 unlock_page(page);
1228 return 0;
1229
1230 redirty_out:
1231 dec_page_count(sbi, F2FS_DIRTY_NODES);
1232 wbc->pages_skipped++;
1233 set_page_dirty(page);
1234 return AOP_WRITEPAGE_ACTIVATE;
1235 }
1236
1237 /*
1238 * It is very important to gather dirty pages and write at once, so that we can
1239 * submit a big bio without interfering other data writes.
1240 * Be default, 512 pages (2MB) * 3 node types, is more reasonable.
1241 */
1242 #define COLLECT_DIRTY_NODES 1536
1243 static int f2fs_write_node_pages(struct address_space *mapping,
1244 struct writeback_control *wbc)
1245 {
1246 struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb);
1247 long nr_to_write = wbc->nr_to_write;
1248
1249 /* balancing f2fs's metadata in background */
1250 f2fs_balance_fs_bg(sbi);
1251
1252 /* collect a number of dirty node pages and write together */
1253 if (get_pages(sbi, F2FS_DIRTY_NODES) < COLLECT_DIRTY_NODES)
1254 return 0;
1255
1256 /* if mounting is failed, skip writing node pages */
1257 wbc->nr_to_write = 3 * max_hw_blocks(sbi);
1258 sync_node_pages(sbi, 0, wbc);
1259 wbc->nr_to_write = nr_to_write - (3 * max_hw_blocks(sbi) -
1260 wbc->nr_to_write);
1261 return 0;
1262 }
1263
1264 static int f2fs_set_node_page_dirty(struct page *page)
1265 {
1266 struct address_space *mapping = page->mapping;
1267 struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb);
1268
1269 trace_f2fs_set_page_dirty(page, NODE);
1270
1271 SetPageUptodate(page);
1272 if (!PageDirty(page)) {
1273 __set_page_dirty_nobuffers(page);
1274 inc_page_count(sbi, F2FS_DIRTY_NODES);
1275 SetPagePrivate(page);
1276 return 1;
1277 }
1278 return 0;
1279 }
1280
1281 static void f2fs_invalidate_node_page(struct page *page, unsigned int offset,
1282 unsigned int length)
1283 {
1284 struct inode *inode = page->mapping->host;
1285 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
1286 if (PageDirty(page))
1287 dec_page_count(sbi, F2FS_DIRTY_NODES);
1288 ClearPagePrivate(page);
1289 }
1290
1291 static int f2fs_release_node_page(struct page *page, gfp_t wait)
1292 {
1293 ClearPagePrivate(page);
1294 return 1;
1295 }
1296
1297 /*
1298 * Structure of the f2fs node operations
1299 */
1300 const struct address_space_operations f2fs_node_aops = {
1301 .writepage = f2fs_write_node_page,
1302 .writepages = f2fs_write_node_pages,
1303 .set_page_dirty = f2fs_set_node_page_dirty,
1304 .invalidatepage = f2fs_invalidate_node_page,
1305 .releasepage = f2fs_release_node_page,
1306 };
1307
1308 static struct free_nid *__lookup_free_nid_list(nid_t n, struct list_head *head)
1309 {
1310 struct list_head *this;
1311 struct free_nid *i;
1312 list_for_each(this, head) {
1313 i = list_entry(this, struct free_nid, list);
1314 if (i->nid == n)
1315 return i;
1316 }
1317 return NULL;
1318 }
1319
1320 static void __del_from_free_nid_list(struct free_nid *i)
1321 {
1322 list_del(&i->list);
1323 kmem_cache_free(free_nid_slab, i);
1324 }
1325
1326 static int add_free_nid(struct f2fs_nm_info *nm_i, nid_t nid, bool build)
1327 {
1328 struct free_nid *i;
1329 struct nat_entry *ne;
1330 bool allocated = false;
1331
1332 if (nm_i->fcnt > 2 * MAX_FREE_NIDS)
1333 return -1;
1334
1335 /* 0 nid should not be used */
1336 if (nid == 0)
1337 return 0;
1338
1339 if (build) {
1340 /* do not add allocated nids */
1341 read_lock(&nm_i->nat_tree_lock);
1342 ne = __lookup_nat_cache(nm_i, nid);
1343 if (ne && nat_get_blkaddr(ne) != NULL_ADDR)
1344 allocated = true;
1345 read_unlock(&nm_i->nat_tree_lock);
1346 if (allocated)
1347 return 0;
1348 }
1349
1350 i = f2fs_kmem_cache_alloc(free_nid_slab, GFP_NOFS);
1351 i->nid = nid;
1352 i->state = NID_NEW;
1353
1354 spin_lock(&nm_i->free_nid_list_lock);
1355 if (__lookup_free_nid_list(nid, &nm_i->free_nid_list)) {
1356 spin_unlock(&nm_i->free_nid_list_lock);
1357 kmem_cache_free(free_nid_slab, i);
1358 return 0;
1359 }
1360 list_add_tail(&i->list, &nm_i->free_nid_list);
1361 nm_i->fcnt++;
1362 spin_unlock(&nm_i->free_nid_list_lock);
1363 return 1;
1364 }
1365
1366 static void remove_free_nid(struct f2fs_nm_info *nm_i, nid_t nid)
1367 {
1368 struct free_nid *i;
1369 spin_lock(&nm_i->free_nid_list_lock);
1370 i = __lookup_free_nid_list(nid, &nm_i->free_nid_list);
1371 if (i && i->state == NID_NEW) {
1372 __del_from_free_nid_list(i);
1373 nm_i->fcnt--;
1374 }
1375 spin_unlock(&nm_i->free_nid_list_lock);
1376 }
1377
1378 static void scan_nat_page(struct f2fs_nm_info *nm_i,
1379 struct page *nat_page, nid_t start_nid)
1380 {
1381 struct f2fs_nat_block *nat_blk = page_address(nat_page);
1382 block_t blk_addr;
1383 int i;
1384
1385 i = start_nid % NAT_ENTRY_PER_BLOCK;
1386
1387 for (; i < NAT_ENTRY_PER_BLOCK; i++, start_nid++) {
1388
1389 if (start_nid >= nm_i->max_nid)
1390 break;
1391
1392 blk_addr = le32_to_cpu(nat_blk->entries[i].block_addr);
1393 f2fs_bug_on(blk_addr == NEW_ADDR);
1394 if (blk_addr == NULL_ADDR) {
1395 if (add_free_nid(nm_i, start_nid, true) < 0)
1396 break;
1397 }
1398 }
1399 }
1400
1401 static void build_free_nids(struct f2fs_sb_info *sbi)
1402 {
1403 struct f2fs_nm_info *nm_i = NM_I(sbi);
1404 struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
1405 struct f2fs_summary_block *sum = curseg->sum_blk;
1406 int i = 0;
1407 nid_t nid = nm_i->next_scan_nid;
1408
1409 /* Enough entries */
1410 if (nm_i->fcnt > NAT_ENTRY_PER_BLOCK)
1411 return;
1412
1413 /* readahead nat pages to be scanned */
1414 ra_nat_pages(sbi, nid);
1415
1416 while (1) {
1417 struct page *page = get_current_nat_page(sbi, nid);
1418
1419 scan_nat_page(nm_i, page, nid);
1420 f2fs_put_page(page, 1);
1421
1422 nid += (NAT_ENTRY_PER_BLOCK - (nid % NAT_ENTRY_PER_BLOCK));
1423 if (nid >= nm_i->max_nid)
1424 nid = 0;
1425
1426 if (i++ == FREE_NID_PAGES)
1427 break;
1428 }
1429
1430 /* go to the next free nat pages to find free nids abundantly */
1431 nm_i->next_scan_nid = nid;
1432
1433 /* find free nids from current sum_pages */
1434 mutex_lock(&curseg->curseg_mutex);
1435 for (i = 0; i < nats_in_cursum(sum); i++) {
1436 block_t addr = le32_to_cpu(nat_in_journal(sum, i).block_addr);
1437 nid = le32_to_cpu(nid_in_journal(sum, i));
1438 if (addr == NULL_ADDR)
1439 add_free_nid(nm_i, nid, true);
1440 else
1441 remove_free_nid(nm_i, nid);
1442 }
1443 mutex_unlock(&curseg->curseg_mutex);
1444 }
1445
1446 /*
1447 * If this function returns success, caller can obtain a new nid
1448 * from second parameter of this function.
1449 * The returned nid could be used ino as well as nid when inode is created.
1450 */
1451 bool alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid)
1452 {
1453 struct f2fs_nm_info *nm_i = NM_I(sbi);
1454 struct free_nid *i = NULL;
1455 struct list_head *this;
1456 retry:
1457 if (sbi->total_valid_node_count + 1 >= nm_i->max_nid)
1458 return false;
1459
1460 spin_lock(&nm_i->free_nid_list_lock);
1461
1462 /* We should not use stale free nids created by build_free_nids */
1463 if (nm_i->fcnt && !sbi->on_build_free_nids) {
1464 f2fs_bug_on(list_empty(&nm_i->free_nid_list));
1465 list_for_each(this, &nm_i->free_nid_list) {
1466 i = list_entry(this, struct free_nid, list);
1467 if (i->state == NID_NEW)
1468 break;
1469 }
1470
1471 f2fs_bug_on(i->state != NID_NEW);
1472 *nid = i->nid;
1473 i->state = NID_ALLOC;
1474 nm_i->fcnt--;
1475 spin_unlock(&nm_i->free_nid_list_lock);
1476 return true;
1477 }
1478 spin_unlock(&nm_i->free_nid_list_lock);
1479
1480 /* Let's scan nat pages and its caches to get free nids */
1481 mutex_lock(&nm_i->build_lock);
1482 sbi->on_build_free_nids = true;
1483 build_free_nids(sbi);
1484 sbi->on_build_free_nids = false;
1485 mutex_unlock(&nm_i->build_lock);
1486 goto retry;
1487 }
1488
1489 /*
1490 * alloc_nid() should be called prior to this function.
1491 */
1492 void alloc_nid_done(struct f2fs_sb_info *sbi, nid_t nid)
1493 {
1494 struct f2fs_nm_info *nm_i = NM_I(sbi);
1495 struct free_nid *i;
1496
1497 spin_lock(&nm_i->free_nid_list_lock);
1498 i = __lookup_free_nid_list(nid, &nm_i->free_nid_list);
1499 f2fs_bug_on(!i || i->state != NID_ALLOC);
1500 __del_from_free_nid_list(i);
1501 spin_unlock(&nm_i->free_nid_list_lock);
1502 }
1503
1504 /*
1505 * alloc_nid() should be called prior to this function.
1506 */
1507 void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
1508 {
1509 struct f2fs_nm_info *nm_i = NM_I(sbi);
1510 struct free_nid *i;
1511
1512 if (!nid)
1513 return;
1514
1515 spin_lock(&nm_i->free_nid_list_lock);
1516 i = __lookup_free_nid_list(nid, &nm_i->free_nid_list);
1517 f2fs_bug_on(!i || i->state != NID_ALLOC);
1518 if (nm_i->fcnt > 2 * MAX_FREE_NIDS) {
1519 __del_from_free_nid_list(i);
1520 } else {
1521 i->state = NID_NEW;
1522 nm_i->fcnt++;
1523 }
1524 spin_unlock(&nm_i->free_nid_list_lock);
1525 }
1526
1527 void recover_node_page(struct f2fs_sb_info *sbi, struct page *page,
1528 struct f2fs_summary *sum, struct node_info *ni,
1529 block_t new_blkaddr)
1530 {
1531 rewrite_node_page(sbi, page, sum, ni->blk_addr, new_blkaddr);
1532 set_node_addr(sbi, ni, new_blkaddr);
1533 clear_node_page_dirty(page);
1534 }
1535
1536 int recover_inode_page(struct f2fs_sb_info *sbi, struct page *page)
1537 {
1538 struct address_space *mapping = sbi->node_inode->i_mapping;
1539 struct f2fs_node *src, *dst;
1540 nid_t ino = ino_of_node(page);
1541 struct node_info old_ni, new_ni;
1542 struct page *ipage;
1543
1544 ipage = grab_cache_page(mapping, ino);
1545 if (!ipage)
1546 return -ENOMEM;
1547
1548 /* Should not use this inode from free nid list */
1549 remove_free_nid(NM_I(sbi), ino);
1550
1551 get_node_info(sbi, ino, &old_ni);
1552 SetPageUptodate(ipage);
1553 fill_node_footer(ipage, ino, ino, 0, true);
1554
1555 src = F2FS_NODE(page);
1556 dst = F2FS_NODE(ipage);
1557
1558 memcpy(dst, src, (unsigned long)&src->i.i_ext - (unsigned long)&src->i);
1559 dst->i.i_size = 0;
1560 dst->i.i_blocks = cpu_to_le64(1);
1561 dst->i.i_links = cpu_to_le32(1);
1562 dst->i.i_xattr_nid = 0;
1563
1564 new_ni = old_ni;
1565 new_ni.ino = ino;
1566
1567 if (!inc_valid_node_count(sbi, NULL, 1))
1568 WARN_ON(1);
1569 set_node_addr(sbi, &new_ni, NEW_ADDR);
1570 inc_valid_inode_count(sbi);
1571 f2fs_put_page(ipage, 1);
1572 return 0;
1573 }
1574
1575 int restore_node_summary(struct f2fs_sb_info *sbi,
1576 unsigned int segno, struct f2fs_summary_block *sum)
1577 {
1578 struct f2fs_node *rn;
1579 struct f2fs_summary *sum_entry;
1580 struct page *page;
1581 block_t addr;
1582 int i, last_offset;
1583
1584 /* alloc temporal page for read node */
1585 page = alloc_page(GFP_NOFS | __GFP_ZERO);
1586 if (!page)
1587 return -ENOMEM;
1588 lock_page(page);
1589
1590 /* scan the node segment */
1591 last_offset = sbi->blocks_per_seg;
1592 addr = START_BLOCK(sbi, segno);
1593 sum_entry = &sum->entries[0];
1594
1595 for (i = 0; i < last_offset; i++, sum_entry++) {
1596 /*
1597 * In order to read next node page,
1598 * we must clear PageUptodate flag.
1599 */
1600 ClearPageUptodate(page);
1601
1602 if (f2fs_readpage(sbi, page, addr, READ_SYNC))
1603 goto out;
1604
1605 lock_page(page);
1606 rn = F2FS_NODE(page);
1607 sum_entry->nid = rn->footer.nid;
1608 sum_entry->version = 0;
1609 sum_entry->ofs_in_node = 0;
1610 addr++;
1611 }
1612 unlock_page(page);
1613 out:
1614 __free_pages(page, 0);
1615 return 0;
1616 }
1617
1618 static bool flush_nats_in_journal(struct f2fs_sb_info *sbi)
1619 {
1620 struct f2fs_nm_info *nm_i = NM_I(sbi);
1621 struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
1622 struct f2fs_summary_block *sum = curseg->sum_blk;
1623 int i;
1624
1625 mutex_lock(&curseg->curseg_mutex);
1626
1627 if (nats_in_cursum(sum) < NAT_JOURNAL_ENTRIES) {
1628 mutex_unlock(&curseg->curseg_mutex);
1629 return false;
1630 }
1631
1632 for (i = 0; i < nats_in_cursum(sum); i++) {
1633 struct nat_entry *ne;
1634 struct f2fs_nat_entry raw_ne;
1635 nid_t nid = le32_to_cpu(nid_in_journal(sum, i));
1636
1637 raw_ne = nat_in_journal(sum, i);
1638 retry:
1639 write_lock(&nm_i->nat_tree_lock);
1640 ne = __lookup_nat_cache(nm_i, nid);
1641 if (ne) {
1642 __set_nat_cache_dirty(nm_i, ne);
1643 write_unlock(&nm_i->nat_tree_lock);
1644 continue;
1645 }
1646 ne = grab_nat_entry(nm_i, nid);
1647 if (!ne) {
1648 write_unlock(&nm_i->nat_tree_lock);
1649 goto retry;
1650 }
1651 nat_set_blkaddr(ne, le32_to_cpu(raw_ne.block_addr));
1652 nat_set_ino(ne, le32_to_cpu(raw_ne.ino));
1653 nat_set_version(ne, raw_ne.version);
1654 __set_nat_cache_dirty(nm_i, ne);
1655 write_unlock(&nm_i->nat_tree_lock);
1656 }
1657 update_nats_in_cursum(sum, -i);
1658 mutex_unlock(&curseg->curseg_mutex);
1659 return true;
1660 }
1661
1662 /*
1663 * This function is called during the checkpointing process.
1664 */
1665 void flush_nat_entries(struct f2fs_sb_info *sbi)
1666 {
1667 struct f2fs_nm_info *nm_i = NM_I(sbi);
1668 struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_HOT_DATA);
1669 struct f2fs_summary_block *sum = curseg->sum_blk;
1670 struct list_head *cur, *n;
1671 struct page *page = NULL;
1672 struct f2fs_nat_block *nat_blk = NULL;
1673 nid_t start_nid = 0, end_nid = 0;
1674 bool flushed;
1675
1676 flushed = flush_nats_in_journal(sbi);
1677
1678 if (!flushed)
1679 mutex_lock(&curseg->curseg_mutex);
1680
1681 /* 1) flush dirty nat caches */
1682 list_for_each_safe(cur, n, &nm_i->dirty_nat_entries) {
1683 struct nat_entry *ne;
1684 nid_t nid;
1685 struct f2fs_nat_entry raw_ne;
1686 int offset = -1;
1687 block_t new_blkaddr;
1688
1689 ne = list_entry(cur, struct nat_entry, list);
1690 nid = nat_get_nid(ne);
1691
1692 if (nat_get_blkaddr(ne) == NEW_ADDR)
1693 continue;
1694 if (flushed)
1695 goto to_nat_page;
1696
1697 /* if there is room for nat enries in curseg->sumpage */
1698 offset = lookup_journal_in_cursum(sum, NAT_JOURNAL, nid, 1);
1699 if (offset >= 0) {
1700 raw_ne = nat_in_journal(sum, offset);
1701 goto flush_now;
1702 }
1703 to_nat_page:
1704 if (!page || (start_nid > nid || nid > end_nid)) {
1705 if (page) {
1706 f2fs_put_page(page, 1);
1707 page = NULL;
1708 }
1709 start_nid = START_NID(nid);
1710 end_nid = start_nid + NAT_ENTRY_PER_BLOCK - 1;
1711
1712 /*
1713 * get nat block with dirty flag, increased reference
1714 * count, mapped and lock
1715 */
1716 page = get_next_nat_page(sbi, start_nid);
1717 nat_blk = page_address(page);
1718 }
1719
1720 f2fs_bug_on(!nat_blk);
1721 raw_ne = nat_blk->entries[nid - start_nid];
1722 flush_now:
1723 new_blkaddr = nat_get_blkaddr(ne);
1724
1725 raw_ne.ino = cpu_to_le32(nat_get_ino(ne));
1726 raw_ne.block_addr = cpu_to_le32(new_blkaddr);
1727 raw_ne.version = nat_get_version(ne);
1728
1729 if (offset < 0) {
1730 nat_blk->entries[nid - start_nid] = raw_ne;
1731 } else {
1732 nat_in_journal(sum, offset) = raw_ne;
1733 nid_in_journal(sum, offset) = cpu_to_le32(nid);
1734 }
1735
1736 if (nat_get_blkaddr(ne) == NULL_ADDR &&
1737 add_free_nid(NM_I(sbi), nid, false) <= 0) {
1738 write_lock(&nm_i->nat_tree_lock);
1739 __del_from_nat_cache(nm_i, ne);
1740 write_unlock(&nm_i->nat_tree_lock);
1741 } else {
1742 write_lock(&nm_i->nat_tree_lock);
1743 __clear_nat_cache_dirty(nm_i, ne);
1744 ne->checkpointed = true;
1745 write_unlock(&nm_i->nat_tree_lock);
1746 }
1747 }
1748 if (!flushed)
1749 mutex_unlock(&curseg->curseg_mutex);
1750 f2fs_put_page(page, 1);
1751
1752 /* 2) shrink nat caches if necessary */
1753 try_to_free_nats(sbi, nm_i->nat_cnt - NM_WOUT_THRESHOLD);
1754 }
1755
1756 static int init_node_manager(struct f2fs_sb_info *sbi)
1757 {
1758 struct f2fs_super_block *sb_raw = F2FS_RAW_SUPER(sbi);
1759 struct f2fs_nm_info *nm_i = NM_I(sbi);
1760 unsigned char *version_bitmap;
1761 unsigned int nat_segs, nat_blocks;
1762
1763 nm_i->nat_blkaddr = le32_to_cpu(sb_raw->nat_blkaddr);
1764
1765 /* segment_count_nat includes pair segment so divide to 2. */
1766 nat_segs = le32_to_cpu(sb_raw->segment_count_nat) >> 1;
1767 nat_blocks = nat_segs << le32_to_cpu(sb_raw->log_blocks_per_seg);
1768 nm_i->max_nid = NAT_ENTRY_PER_BLOCK * nat_blocks;
1769 nm_i->fcnt = 0;
1770 nm_i->nat_cnt = 0;
1771
1772 INIT_LIST_HEAD(&nm_i->free_nid_list);
1773 INIT_RADIX_TREE(&nm_i->nat_root, GFP_ATOMIC);
1774 INIT_LIST_HEAD(&nm_i->nat_entries);
1775 INIT_LIST_HEAD(&nm_i->dirty_nat_entries);
1776
1777 mutex_init(&nm_i->build_lock);
1778 spin_lock_init(&nm_i->free_nid_list_lock);
1779 rwlock_init(&nm_i->nat_tree_lock);
1780
1781 nm_i->next_scan_nid = le32_to_cpu(sbi->ckpt->next_free_nid);
1782 nm_i->bitmap_size = __bitmap_size(sbi, NAT_BITMAP);
1783 version_bitmap = __bitmap_ptr(sbi, NAT_BITMAP);
1784 if (!version_bitmap)
1785 return -EFAULT;
1786
1787 nm_i->nat_bitmap = kmemdup(version_bitmap, nm_i->bitmap_size,
1788 GFP_KERNEL);
1789 if (!nm_i->nat_bitmap)
1790 return -ENOMEM;
1791 return 0;
1792 }
1793
1794 int build_node_manager(struct f2fs_sb_info *sbi)
1795 {
1796 int err;
1797
1798 sbi->nm_info = kzalloc(sizeof(struct f2fs_nm_info), GFP_KERNEL);
1799 if (!sbi->nm_info)
1800 return -ENOMEM;
1801
1802 err = init_node_manager(sbi);
1803 if (err)
1804 return err;
1805
1806 build_free_nids(sbi);
1807 return 0;
1808 }
1809
1810 void destroy_node_manager(struct f2fs_sb_info *sbi)
1811 {
1812 struct f2fs_nm_info *nm_i = NM_I(sbi);
1813 struct free_nid *i, *next_i;
1814 struct nat_entry *natvec[NATVEC_SIZE];
1815 nid_t nid = 0;
1816 unsigned int found;
1817
1818 if (!nm_i)
1819 return;
1820
1821 /* destroy free nid list */
1822 spin_lock(&nm_i->free_nid_list_lock);
1823 list_for_each_entry_safe(i, next_i, &nm_i->free_nid_list, list) {
1824 f2fs_bug_on(i->state == NID_ALLOC);
1825 __del_from_free_nid_list(i);
1826 nm_i->fcnt--;
1827 }
1828 f2fs_bug_on(nm_i->fcnt);
1829 spin_unlock(&nm_i->free_nid_list_lock);
1830
1831 /* destroy nat cache */
1832 write_lock(&nm_i->nat_tree_lock);
1833 while ((found = __gang_lookup_nat_cache(nm_i,
1834 nid, NATVEC_SIZE, natvec))) {
1835 unsigned idx;
1836 for (idx = 0; idx < found; idx++) {
1837 struct nat_entry *e = natvec[idx];
1838 nid = nat_get_nid(e) + 1;
1839 __del_from_nat_cache(nm_i, e);
1840 }
1841 }
1842 f2fs_bug_on(nm_i->nat_cnt);
1843 write_unlock(&nm_i->nat_tree_lock);
1844
1845 kfree(nm_i->nat_bitmap);
1846 sbi->nm_info = NULL;
1847 kfree(nm_i);
1848 }
1849
1850 int __init create_node_manager_caches(void)
1851 {
1852 nat_entry_slab = f2fs_kmem_cache_create("nat_entry",
1853 sizeof(struct nat_entry), NULL);
1854 if (!nat_entry_slab)
1855 return -ENOMEM;
1856
1857 free_nid_slab = f2fs_kmem_cache_create("free_nid",
1858 sizeof(struct free_nid), NULL);
1859 if (!free_nid_slab) {
1860 kmem_cache_destroy(nat_entry_slab);
1861 return -ENOMEM;
1862 }
1863 return 0;
1864 }
1865
1866 void destroy_node_manager_caches(void)
1867 {
1868 kmem_cache_destroy(free_nid_slab);
1869 kmem_cache_destroy(nat_entry_slab);
1870 }
Linus' kernel tree