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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * NILFS inode operations.
4 *
5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Written by Ryusuke Konishi.
8 *
9 */
10
11#include <linux/buffer_head.h>
12#include <linux/gfp.h>
13#include <linux/mpage.h>
14#include <linux/pagemap.h>
15#include <linux/writeback.h>
16#include <linux/uio.h>
17#include <linux/fiemap.h>
18#include "nilfs.h"
19#include "btnode.h"
20#include "segment.h"
21#include "page.h"
22#include "mdt.h"
23#include "cpfile.h"
24#include "ifile.h"
25
26/**
27 * struct nilfs_iget_args - arguments used during comparison between inodes
28 * @ino: inode number
29 * @cno: checkpoint number
30 * @root: pointer on NILFS root object (mounted checkpoint)
31 * @for_gc: inode for GC flag
32 * @for_btnc: inode for B-tree node cache flag
33 * @for_shadow: inode for shadowed page cache flag
34 */
35struct nilfs_iget_args {
36 u64 ino;
37 __u64 cno;
38 struct nilfs_root *root;
39 bool for_gc;
40 bool for_btnc;
41 bool for_shadow;
42};
43
44static int nilfs_iget_test(struct inode *inode, void *opaque);
45
46void nilfs_inode_add_blocks(struct inode *inode, int n)
47{
48 struct nilfs_root *root = NILFS_I(inode)->i_root;
49
50 inode_add_bytes(inode, i_blocksize(inode) * n);
51 if (root)
52 atomic64_add(n, &root->blocks_count);
53}
54
55void nilfs_inode_sub_blocks(struct inode *inode, int n)
56{
57 struct nilfs_root *root = NILFS_I(inode)->i_root;
58
59 inode_sub_bytes(inode, i_blocksize(inode) * n);
60 if (root)
61 atomic64_sub(n, &root->blocks_count);
62}
63
64/**
65 * nilfs_get_block() - get a file block on the filesystem (callback function)
66 * @inode: inode struct of the target file
67 * @blkoff: file block number
68 * @bh_result: buffer head to be mapped on
69 * @create: indicate whether allocating the block or not when it has not
70 * been allocated yet.
71 *
72 * This function does not issue actual read request of the specified data
73 * block. It is done by VFS.
74 */
75int nilfs_get_block(struct inode *inode, sector_t blkoff,
76 struct buffer_head *bh_result, int create)
77{
78 struct nilfs_inode_info *ii = NILFS_I(inode);
79 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
80 __u64 blknum = 0;
81 int err = 0, ret;
82 unsigned int maxblocks = bh_result->b_size >> inode->i_blkbits;
83
84 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
85 ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
86 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
87 if (ret >= 0) { /* found */
88 map_bh(bh_result, inode->i_sb, blknum);
89 if (ret > 0)
90 bh_result->b_size = (ret << inode->i_blkbits);
91 goto out;
92 }
93 /* data block was not found */
94 if (ret == -ENOENT && create) {
95 struct nilfs_transaction_info ti;
96
97 bh_result->b_blocknr = 0;
98 err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
99 if (unlikely(err))
100 goto out;
101 err = nilfs_bmap_insert(ii->i_bmap, blkoff,
102 (unsigned long)bh_result);
103 if (unlikely(err != 0)) {
104 if (err == -EEXIST) {
105 /*
106 * The get_block() function could be called
107 * from multiple callers for an inode.
108 * However, the page having this block must
109 * be locked in this case.
110 */
111 nilfs_warn(inode->i_sb,
112 "%s (ino=%lu): a race condition while inserting a data block at offset=%llu",
113 __func__, inode->i_ino,
114 (unsigned long long)blkoff);
115 err = 0;
116 }
117 nilfs_transaction_abort(inode->i_sb);
118 goto out;
119 }
120 nilfs_mark_inode_dirty_sync(inode);
121 nilfs_transaction_commit(inode->i_sb); /* never fails */
122 /* Error handling should be detailed */
123 set_buffer_new(bh_result);
124 set_buffer_delay(bh_result);
125 map_bh(bh_result, inode->i_sb, 0);
126 /* Disk block number must be changed to proper value */
127
128 } else if (ret == -ENOENT) {
129 /*
130 * not found is not error (e.g. hole); must return without
131 * the mapped state flag.
132 */
133 ;
134 } else {
135 err = ret;
136 }
137
138 out:
139 return err;
140}
141
142/**
143 * nilfs_read_folio() - implement read_folio() method of nilfs_aops {}
144 * address_space_operations.
145 * @file: file struct of the file to be read
146 * @folio: the folio to be read
147 */
148static int nilfs_read_folio(struct file *file, struct folio *folio)
149{
150 return mpage_read_folio(folio, nilfs_get_block);
151}
152
153static void nilfs_readahead(struct readahead_control *rac)
154{
155 mpage_readahead(rac, nilfs_get_block);
156}
157
158static int nilfs_writepages(struct address_space *mapping,
159 struct writeback_control *wbc)
160{
161 struct inode *inode = mapping->host;
162 int err = 0;
163
164 if (sb_rdonly(inode->i_sb)) {
165 nilfs_clear_dirty_pages(mapping, false);
166 return -EROFS;
167 }
168
169 if (wbc->sync_mode == WB_SYNC_ALL)
170 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
171 wbc->range_start,
172 wbc->range_end);
173 return err;
174}
175
176static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
177{
178 struct folio *folio = page_folio(page);
179 struct inode *inode = folio->mapping->host;
180 int err;
181
182 if (sb_rdonly(inode->i_sb)) {
183 /*
184 * It means that filesystem was remounted in read-only
185 * mode because of error or metadata corruption. But we
186 * have dirty pages that try to be flushed in background.
187 * So, here we simply discard this dirty page.
188 */
189 nilfs_clear_folio_dirty(folio, false);
190 folio_unlock(folio);
191 return -EROFS;
192 }
193
194 folio_redirty_for_writepage(wbc, folio);
195 folio_unlock(folio);
196
197 if (wbc->sync_mode == WB_SYNC_ALL) {
198 err = nilfs_construct_segment(inode->i_sb);
199 if (unlikely(err))
200 return err;
201 } else if (wbc->for_reclaim)
202 nilfs_flush_segment(inode->i_sb, inode->i_ino);
203
204 return 0;
205}
206
207static bool nilfs_dirty_folio(struct address_space *mapping,
208 struct folio *folio)
209{
210 struct inode *inode = mapping->host;
211 struct buffer_head *head;
212 unsigned int nr_dirty = 0;
213 bool ret = filemap_dirty_folio(mapping, folio);
214
215 /*
216 * The page may not be locked, eg if called from try_to_unmap_one()
217 */
218 spin_lock(&mapping->i_private_lock);
219 head = folio_buffers(folio);
220 if (head) {
221 struct buffer_head *bh = head;
222
223 do {
224 /* Do not mark hole blocks dirty */
225 if (buffer_dirty(bh) || !buffer_mapped(bh))
226 continue;
227
228 set_buffer_dirty(bh);
229 nr_dirty++;
230 } while (bh = bh->b_this_page, bh != head);
231 } else if (ret) {
232 nr_dirty = 1 << (folio_shift(folio) - inode->i_blkbits);
233 }
234 spin_unlock(&mapping->i_private_lock);
235
236 if (nr_dirty)
237 nilfs_set_file_dirty(inode, nr_dirty);
238 return ret;
239}
240
241void nilfs_write_failed(struct address_space *mapping, loff_t to)
242{
243 struct inode *inode = mapping->host;
244
245 if (to > inode->i_size) {
246 truncate_pagecache(inode, inode->i_size);
247 nilfs_truncate(inode);
248 }
249}
250
251static int nilfs_write_begin(struct file *file, struct address_space *mapping,
252 loff_t pos, unsigned len,
253 struct page **pagep, void **fsdata)
254
255{
256 struct inode *inode = mapping->host;
257 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
258
259 if (unlikely(err))
260 return err;
261
262 err = block_write_begin(mapping, pos, len, pagep, nilfs_get_block);
263 if (unlikely(err)) {
264 nilfs_write_failed(mapping, pos + len);
265 nilfs_transaction_abort(inode->i_sb);
266 }
267 return err;
268}
269
270static int nilfs_write_end(struct file *file, struct address_space *mapping,
271 loff_t pos, unsigned len, unsigned copied,
272 struct page *page, void *fsdata)
273{
274 struct inode *inode = mapping->host;
275 unsigned int start = pos & (PAGE_SIZE - 1);
276 unsigned int nr_dirty;
277 int err;
278
279 nr_dirty = nilfs_page_count_clean_buffers(page, start,
280 start + copied);
281 copied = generic_write_end(file, mapping, pos, len, copied, page,
282 fsdata);
283 nilfs_set_file_dirty(inode, nr_dirty);
284 err = nilfs_transaction_commit(inode->i_sb);
285 return err ? : copied;
286}
287
288static ssize_t
289nilfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
290{
291 struct inode *inode = file_inode(iocb->ki_filp);
292
293 if (iov_iter_rw(iter) == WRITE)
294 return 0;
295
296 /* Needs synchronization with the cleaner */
297 return blockdev_direct_IO(iocb, inode, iter, nilfs_get_block);
298}
299
300const struct address_space_operations nilfs_aops = {
301 .writepage = nilfs_writepage,
302 .read_folio = nilfs_read_folio,
303 .writepages = nilfs_writepages,
304 .dirty_folio = nilfs_dirty_folio,
305 .readahead = nilfs_readahead,
306 .write_begin = nilfs_write_begin,
307 .write_end = nilfs_write_end,
308 .invalidate_folio = block_invalidate_folio,
309 .direct_IO = nilfs_direct_IO,
310 .is_partially_uptodate = block_is_partially_uptodate,
311};
312
313static int nilfs_insert_inode_locked(struct inode *inode,
314 struct nilfs_root *root,
315 unsigned long ino)
316{
317 struct nilfs_iget_args args = {
318 .ino = ino, .root = root, .cno = 0, .for_gc = false,
319 .for_btnc = false, .for_shadow = false
320 };
321
322 return insert_inode_locked4(inode, ino, nilfs_iget_test, &args);
323}
324
325struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
326{
327 struct super_block *sb = dir->i_sb;
328 struct the_nilfs *nilfs = sb->s_fs_info;
329 struct inode *inode;
330 struct nilfs_inode_info *ii;
331 struct nilfs_root *root;
332 struct buffer_head *bh;
333 int err = -ENOMEM;
334 ino_t ino;
335
336 inode = new_inode(sb);
337 if (unlikely(!inode))
338 goto failed;
339
340 mapping_set_gfp_mask(inode->i_mapping,
341 mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
342
343 root = NILFS_I(dir)->i_root;
344 ii = NILFS_I(inode);
345 ii->i_state = BIT(NILFS_I_NEW);
346 ii->i_root = root;
347
348 err = nilfs_ifile_create_inode(root->ifile, &ino, &bh);
349 if (unlikely(err))
350 goto failed_ifile_create_inode;
351 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
352
353 if (unlikely(ino < NILFS_USER_INO)) {
354 nilfs_warn(sb,
355 "inode bitmap is inconsistent for reserved inodes");
356 do {
357 brelse(bh);
358 err = nilfs_ifile_create_inode(root->ifile, &ino, &bh);
359 if (unlikely(err))
360 goto failed_ifile_create_inode;
361 } while (ino < NILFS_USER_INO);
362
363 nilfs_info(sb, "repaired inode bitmap for reserved inodes");
364 }
365 ii->i_bh = bh;
366
367 atomic64_inc(&root->inodes_count);
368 inode_init_owner(&nop_mnt_idmap, inode, dir, mode);
369 inode->i_ino = ino;
370 simple_inode_init_ts(inode);
371
372 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
373 err = nilfs_bmap_read(ii->i_bmap, NULL);
374 if (err < 0)
375 goto failed_after_creation;
376
377 set_bit(NILFS_I_BMAP, &ii->i_state);
378 /* No lock is needed; iget() ensures it. */
379 }
380
381 ii->i_flags = nilfs_mask_flags(
382 mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED);
383
384 /* ii->i_file_acl = 0; */
385 /* ii->i_dir_acl = 0; */
386 ii->i_dir_start_lookup = 0;
387 nilfs_set_inode_flags(inode);
388 spin_lock(&nilfs->ns_next_gen_lock);
389 inode->i_generation = nilfs->ns_next_generation++;
390 spin_unlock(&nilfs->ns_next_gen_lock);
391 if (nilfs_insert_inode_locked(inode, root, ino) < 0) {
392 err = -EIO;
393 goto failed_after_creation;
394 }
395
396 err = nilfs_init_acl(inode, dir);
397 if (unlikely(err))
398 /*
399 * Never occur. When supporting nilfs_init_acl(),
400 * proper cancellation of above jobs should be considered.
401 */
402 goto failed_after_creation;
403
404 return inode;
405
406 failed_after_creation:
407 clear_nlink(inode);
408 if (inode->i_state & I_NEW)
409 unlock_new_inode(inode);
410 iput(inode); /*
411 * raw_inode will be deleted through
412 * nilfs_evict_inode().
413 */
414 goto failed;
415
416 failed_ifile_create_inode:
417 make_bad_inode(inode);
418 iput(inode);
419 failed:
420 return ERR_PTR(err);
421}
422
423void nilfs_set_inode_flags(struct inode *inode)
424{
425 unsigned int flags = NILFS_I(inode)->i_flags;
426 unsigned int new_fl = 0;
427
428 if (flags & FS_SYNC_FL)
429 new_fl |= S_SYNC;
430 if (flags & FS_APPEND_FL)
431 new_fl |= S_APPEND;
432 if (flags & FS_IMMUTABLE_FL)
433 new_fl |= S_IMMUTABLE;
434 if (flags & FS_NOATIME_FL)
435 new_fl |= S_NOATIME;
436 if (flags & FS_DIRSYNC_FL)
437 new_fl |= S_DIRSYNC;
438 inode_set_flags(inode, new_fl, S_SYNC | S_APPEND | S_IMMUTABLE |
439 S_NOATIME | S_DIRSYNC);
440}
441
442int nilfs_read_inode_common(struct inode *inode,
443 struct nilfs_inode *raw_inode)
444{
445 struct nilfs_inode_info *ii = NILFS_I(inode);
446 int err;
447
448 inode->i_mode = le16_to_cpu(raw_inode->i_mode);
449 i_uid_write(inode, le32_to_cpu(raw_inode->i_uid));
450 i_gid_write(inode, le32_to_cpu(raw_inode->i_gid));
451 set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
452 inode->i_size = le64_to_cpu(raw_inode->i_size);
453 inode_set_atime(inode, le64_to_cpu(raw_inode->i_mtime),
454 le32_to_cpu(raw_inode->i_mtime_nsec));
455 inode_set_ctime(inode, le64_to_cpu(raw_inode->i_ctime),
456 le32_to_cpu(raw_inode->i_ctime_nsec));
457 inode_set_mtime(inode, le64_to_cpu(raw_inode->i_mtime),
458 le32_to_cpu(raw_inode->i_mtime_nsec));
459 if (nilfs_is_metadata_file_inode(inode) && !S_ISREG(inode->i_mode))
460 return -EIO; /* this inode is for metadata and corrupted */
461 if (inode->i_nlink == 0)
462 return -ESTALE; /* this inode is deleted */
463
464 inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
465 ii->i_flags = le32_to_cpu(raw_inode->i_flags);
466#if 0
467 ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
468 ii->i_dir_acl = S_ISREG(inode->i_mode) ?
469 0 : le32_to_cpu(raw_inode->i_dir_acl);
470#endif
471 ii->i_dir_start_lookup = 0;
472 inode->i_generation = le32_to_cpu(raw_inode->i_generation);
473
474 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
475 S_ISLNK(inode->i_mode)) {
476 err = nilfs_bmap_read(ii->i_bmap, raw_inode);
477 if (err < 0)
478 return err;
479 set_bit(NILFS_I_BMAP, &ii->i_state);
480 /* No lock is needed; iget() ensures it. */
481 }
482 return 0;
483}
484
485static int __nilfs_read_inode(struct super_block *sb,
486 struct nilfs_root *root, unsigned long ino,
487 struct inode *inode)
488{
489 struct the_nilfs *nilfs = sb->s_fs_info;
490 struct buffer_head *bh;
491 struct nilfs_inode *raw_inode;
492 int err;
493
494 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
495 err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
496 if (unlikely(err))
497 goto bad_inode;
498
499 raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
500
501 err = nilfs_read_inode_common(inode, raw_inode);
502 if (err)
503 goto failed_unmap;
504
505 if (S_ISREG(inode->i_mode)) {
506 inode->i_op = &nilfs_file_inode_operations;
507 inode->i_fop = &nilfs_file_operations;
508 inode->i_mapping->a_ops = &nilfs_aops;
509 } else if (S_ISDIR(inode->i_mode)) {
510 inode->i_op = &nilfs_dir_inode_operations;
511 inode->i_fop = &nilfs_dir_operations;
512 inode->i_mapping->a_ops = &nilfs_aops;
513 } else if (S_ISLNK(inode->i_mode)) {
514 inode->i_op = &nilfs_symlink_inode_operations;
515 inode_nohighmem(inode);
516 inode->i_mapping->a_ops = &nilfs_aops;
517 } else {
518 inode->i_op = &nilfs_special_inode_operations;
519 init_special_inode(
520 inode, inode->i_mode,
521 huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
522 }
523 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
524 brelse(bh);
525 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
526 nilfs_set_inode_flags(inode);
527 mapping_set_gfp_mask(inode->i_mapping,
528 mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
529 return 0;
530
531 failed_unmap:
532 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
533 brelse(bh);
534
535 bad_inode:
536 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
537 return err;
538}
539
540static int nilfs_iget_test(struct inode *inode, void *opaque)
541{
542 struct nilfs_iget_args *args = opaque;
543 struct nilfs_inode_info *ii;
544
545 if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
546 return 0;
547
548 ii = NILFS_I(inode);
549 if (test_bit(NILFS_I_BTNC, &ii->i_state)) {
550 if (!args->for_btnc)
551 return 0;
552 } else if (args->for_btnc) {
553 return 0;
554 }
555 if (test_bit(NILFS_I_SHADOW, &ii->i_state)) {
556 if (!args->for_shadow)
557 return 0;
558 } else if (args->for_shadow) {
559 return 0;
560 }
561
562 if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
563 return !args->for_gc;
564
565 return args->for_gc && args->cno == ii->i_cno;
566}
567
568static int nilfs_iget_set(struct inode *inode, void *opaque)
569{
570 struct nilfs_iget_args *args = opaque;
571
572 inode->i_ino = args->ino;
573 NILFS_I(inode)->i_cno = args->cno;
574 NILFS_I(inode)->i_root = args->root;
575 if (args->root && args->ino == NILFS_ROOT_INO)
576 nilfs_get_root(args->root);
577
578 if (args->for_gc)
579 NILFS_I(inode)->i_state = BIT(NILFS_I_GCINODE);
580 if (args->for_btnc)
581 NILFS_I(inode)->i_state |= BIT(NILFS_I_BTNC);
582 if (args->for_shadow)
583 NILFS_I(inode)->i_state |= BIT(NILFS_I_SHADOW);
584 return 0;
585}
586
587struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
588 unsigned long ino)
589{
590 struct nilfs_iget_args args = {
591 .ino = ino, .root = root, .cno = 0, .for_gc = false,
592 .for_btnc = false, .for_shadow = false
593 };
594
595 return ilookup5(sb, ino, nilfs_iget_test, &args);
596}
597
598struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
599 unsigned long ino)
600{
601 struct nilfs_iget_args args = {
602 .ino = ino, .root = root, .cno = 0, .for_gc = false,
603 .for_btnc = false, .for_shadow = false
604 };
605
606 return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
607}
608
609struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
610 unsigned long ino)
611{
612 struct inode *inode;
613 int err;
614
615 inode = nilfs_iget_locked(sb, root, ino);
616 if (unlikely(!inode))
617 return ERR_PTR(-ENOMEM);
618 if (!(inode->i_state & I_NEW))
619 return inode;
620
621 err = __nilfs_read_inode(sb, root, ino, inode);
622 if (unlikely(err)) {
623 iget_failed(inode);
624 return ERR_PTR(err);
625 }
626 unlock_new_inode(inode);
627 return inode;
628}
629
630struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
631 __u64 cno)
632{
633 struct nilfs_iget_args args = {
634 .ino = ino, .root = NULL, .cno = cno, .for_gc = true,
635 .for_btnc = false, .for_shadow = false
636 };
637 struct inode *inode;
638 int err;
639
640 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
641 if (unlikely(!inode))
642 return ERR_PTR(-ENOMEM);
643 if (!(inode->i_state & I_NEW))
644 return inode;
645
646 err = nilfs_init_gcinode(inode);
647 if (unlikely(err)) {
648 iget_failed(inode);
649 return ERR_PTR(err);
650 }
651 unlock_new_inode(inode);
652 return inode;
653}
654
655/**
656 * nilfs_attach_btree_node_cache - attach a B-tree node cache to the inode
657 * @inode: inode object
658 *
659 * nilfs_attach_btree_node_cache() attaches a B-tree node cache to @inode,
660 * or does nothing if the inode already has it. This function allocates
661 * an additional inode to maintain page cache of B-tree nodes one-on-one.
662 *
663 * Return Value: On success, 0 is returned. On errors, one of the following
664 * negative error code is returned.
665 *
666 * %-ENOMEM - Insufficient memory available.
667 */
668int nilfs_attach_btree_node_cache(struct inode *inode)
669{
670 struct nilfs_inode_info *ii = NILFS_I(inode);
671 struct inode *btnc_inode;
672 struct nilfs_iget_args args;
673
674 if (ii->i_assoc_inode)
675 return 0;
676
677 args.ino = inode->i_ino;
678 args.root = ii->i_root;
679 args.cno = ii->i_cno;
680 args.for_gc = test_bit(NILFS_I_GCINODE, &ii->i_state) != 0;
681 args.for_btnc = true;
682 args.for_shadow = test_bit(NILFS_I_SHADOW, &ii->i_state) != 0;
683
684 btnc_inode = iget5_locked(inode->i_sb, inode->i_ino, nilfs_iget_test,
685 nilfs_iget_set, &args);
686 if (unlikely(!btnc_inode))
687 return -ENOMEM;
688 if (btnc_inode->i_state & I_NEW) {
689 nilfs_init_btnc_inode(btnc_inode);
690 unlock_new_inode(btnc_inode);
691 }
692 NILFS_I(btnc_inode)->i_assoc_inode = inode;
693 NILFS_I(btnc_inode)->i_bmap = ii->i_bmap;
694 ii->i_assoc_inode = btnc_inode;
695
696 return 0;
697}
698
699/**
700 * nilfs_detach_btree_node_cache - detach the B-tree node cache from the inode
701 * @inode: inode object
702 *
703 * nilfs_detach_btree_node_cache() detaches the B-tree node cache and its
704 * holder inode bound to @inode, or does nothing if @inode doesn't have it.
705 */
706void nilfs_detach_btree_node_cache(struct inode *inode)
707{
708 struct nilfs_inode_info *ii = NILFS_I(inode);
709 struct inode *btnc_inode = ii->i_assoc_inode;
710
711 if (btnc_inode) {
712 NILFS_I(btnc_inode)->i_assoc_inode = NULL;
713 ii->i_assoc_inode = NULL;
714 iput(btnc_inode);
715 }
716}
717
718/**
719 * nilfs_iget_for_shadow - obtain inode for shadow mapping
720 * @inode: inode object that uses shadow mapping
721 *
722 * nilfs_iget_for_shadow() allocates a pair of inodes that holds page
723 * caches for shadow mapping. The page cache for data pages is set up
724 * in one inode and the one for b-tree node pages is set up in the
725 * other inode, which is attached to the former inode.
726 *
727 * Return Value: On success, a pointer to the inode for data pages is
728 * returned. On errors, one of the following negative error code is returned
729 * in a pointer type.
730 *
731 * %-ENOMEM - Insufficient memory available.
732 */
733struct inode *nilfs_iget_for_shadow(struct inode *inode)
734{
735 struct nilfs_iget_args args = {
736 .ino = inode->i_ino, .root = NULL, .cno = 0, .for_gc = false,
737 .for_btnc = false, .for_shadow = true
738 };
739 struct inode *s_inode;
740 int err;
741
742 s_inode = iget5_locked(inode->i_sb, inode->i_ino, nilfs_iget_test,
743 nilfs_iget_set, &args);
744 if (unlikely(!s_inode))
745 return ERR_PTR(-ENOMEM);
746 if (!(s_inode->i_state & I_NEW))
747 return inode;
748
749 NILFS_I(s_inode)->i_flags = 0;
750 memset(NILFS_I(s_inode)->i_bmap, 0, sizeof(struct nilfs_bmap));
751 mapping_set_gfp_mask(s_inode->i_mapping, GFP_NOFS);
752
753 err = nilfs_attach_btree_node_cache(s_inode);
754 if (unlikely(err)) {
755 iget_failed(s_inode);
756 return ERR_PTR(err);
757 }
758 unlock_new_inode(s_inode);
759 return s_inode;
760}
761
762void nilfs_write_inode_common(struct inode *inode,
763 struct nilfs_inode *raw_inode, int has_bmap)
764{
765 struct nilfs_inode_info *ii = NILFS_I(inode);
766
767 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
768 raw_inode->i_uid = cpu_to_le32(i_uid_read(inode));
769 raw_inode->i_gid = cpu_to_le32(i_gid_read(inode));
770 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
771 raw_inode->i_size = cpu_to_le64(inode->i_size);
772 raw_inode->i_ctime = cpu_to_le64(inode_get_ctime_sec(inode));
773 raw_inode->i_mtime = cpu_to_le64(inode_get_mtime_sec(inode));
774 raw_inode->i_ctime_nsec = cpu_to_le32(inode_get_ctime_nsec(inode));
775 raw_inode->i_mtime_nsec = cpu_to_le32(inode_get_mtime_nsec(inode));
776 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
777
778 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
779 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
780
781 if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) {
782 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
783
784 /* zero-fill unused portion in the case of super root block */
785 raw_inode->i_xattr = 0;
786 raw_inode->i_pad = 0;
787 memset((void *)raw_inode + sizeof(*raw_inode), 0,
788 nilfs->ns_inode_size - sizeof(*raw_inode));
789 }
790
791 if (has_bmap)
792 nilfs_bmap_write(ii->i_bmap, raw_inode);
793 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
794 raw_inode->i_device_code =
795 cpu_to_le64(huge_encode_dev(inode->i_rdev));
796 /*
797 * When extending inode, nilfs->ns_inode_size should be checked
798 * for substitutions of appended fields.
799 */
800}
801
802void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh, int flags)
803{
804 ino_t ino = inode->i_ino;
805 struct nilfs_inode_info *ii = NILFS_I(inode);
806 struct inode *ifile = ii->i_root->ifile;
807 struct nilfs_inode *raw_inode;
808
809 raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
810
811 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
812 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
813 if (flags & I_DIRTY_DATASYNC)
814 set_bit(NILFS_I_INODE_SYNC, &ii->i_state);
815
816 nilfs_write_inode_common(inode, raw_inode, 0);
817 /*
818 * XXX: call with has_bmap = 0 is a workaround to avoid
819 * deadlock of bmap. This delays update of i_bmap to just
820 * before writing.
821 */
822
823 nilfs_ifile_unmap_inode(ifile, ino, ibh);
824}
825
826#define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
827
828static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
829 unsigned long from)
830{
831 __u64 b;
832 int ret;
833
834 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
835 return;
836repeat:
837 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
838 if (ret == -ENOENT)
839 return;
840 else if (ret < 0)
841 goto failed;
842
843 if (b < from)
844 return;
845
846 b -= min_t(__u64, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
847 ret = nilfs_bmap_truncate(ii->i_bmap, b);
848 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
849 if (!ret || (ret == -ENOMEM &&
850 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
851 goto repeat;
852
853failed:
854 nilfs_warn(ii->vfs_inode.i_sb, "error %d truncating bmap (ino=%lu)",
855 ret, ii->vfs_inode.i_ino);
856}
857
858void nilfs_truncate(struct inode *inode)
859{
860 unsigned long blkoff;
861 unsigned int blocksize;
862 struct nilfs_transaction_info ti;
863 struct super_block *sb = inode->i_sb;
864 struct nilfs_inode_info *ii = NILFS_I(inode);
865
866 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
867 return;
868 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
869 return;
870
871 blocksize = sb->s_blocksize;
872 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
873 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
874
875 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
876
877 nilfs_truncate_bmap(ii, blkoff);
878
879 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
880 if (IS_SYNC(inode))
881 nilfs_set_transaction_flag(NILFS_TI_SYNC);
882
883 nilfs_mark_inode_dirty(inode);
884 nilfs_set_file_dirty(inode, 0);
885 nilfs_transaction_commit(sb);
886 /*
887 * May construct a logical segment and may fail in sync mode.
888 * But truncate has no return value.
889 */
890}
891
892static void nilfs_clear_inode(struct inode *inode)
893{
894 struct nilfs_inode_info *ii = NILFS_I(inode);
895
896 /*
897 * Free resources allocated in nilfs_read_inode(), here.
898 */
899 BUG_ON(!list_empty(&ii->i_dirty));
900 brelse(ii->i_bh);
901 ii->i_bh = NULL;
902
903 if (nilfs_is_metadata_file_inode(inode))
904 nilfs_mdt_clear(inode);
905
906 if (test_bit(NILFS_I_BMAP, &ii->i_state))
907 nilfs_bmap_clear(ii->i_bmap);
908
909 if (!test_bit(NILFS_I_BTNC, &ii->i_state))
910 nilfs_detach_btree_node_cache(inode);
911
912 if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
913 nilfs_put_root(ii->i_root);
914}
915
916void nilfs_evict_inode(struct inode *inode)
917{
918 struct nilfs_transaction_info ti;
919 struct super_block *sb = inode->i_sb;
920 struct nilfs_inode_info *ii = NILFS_I(inode);
921 struct the_nilfs *nilfs;
922 int ret;
923
924 if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
925 truncate_inode_pages_final(&inode->i_data);
926 clear_inode(inode);
927 nilfs_clear_inode(inode);
928 return;
929 }
930 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
931
932 truncate_inode_pages_final(&inode->i_data);
933
934 nilfs = sb->s_fs_info;
935 if (unlikely(sb_rdonly(sb) || !nilfs->ns_writer)) {
936 /*
937 * If this inode is about to be disposed after the file system
938 * has been degraded to read-only due to file system corruption
939 * or after the writer has been detached, do not make any
940 * changes that cause writes, just clear it.
941 * Do this check after read-locking ns_segctor_sem by
942 * nilfs_transaction_begin() in order to avoid a race with
943 * the writer detach operation.
944 */
945 clear_inode(inode);
946 nilfs_clear_inode(inode);
947 nilfs_transaction_abort(sb);
948 return;
949 }
950
951 /* TODO: some of the following operations may fail. */
952 nilfs_truncate_bmap(ii, 0);
953 nilfs_mark_inode_dirty(inode);
954 clear_inode(inode);
955
956 ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
957 if (!ret)
958 atomic64_dec(&ii->i_root->inodes_count);
959
960 nilfs_clear_inode(inode);
961
962 if (IS_SYNC(inode))
963 nilfs_set_transaction_flag(NILFS_TI_SYNC);
964 nilfs_transaction_commit(sb);
965 /*
966 * May construct a logical segment and may fail in sync mode.
967 * But delete_inode has no return value.
968 */
969}
970
971int nilfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
972 struct iattr *iattr)
973{
974 struct nilfs_transaction_info ti;
975 struct inode *inode = d_inode(dentry);
976 struct super_block *sb = inode->i_sb;
977 int err;
978
979 err = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
980 if (err)
981 return err;
982
983 err = nilfs_transaction_begin(sb, &ti, 0);
984 if (unlikely(err))
985 return err;
986
987 if ((iattr->ia_valid & ATTR_SIZE) &&
988 iattr->ia_size != i_size_read(inode)) {
989 inode_dio_wait(inode);
990 truncate_setsize(inode, iattr->ia_size);
991 nilfs_truncate(inode);
992 }
993
994 setattr_copy(&nop_mnt_idmap, inode, iattr);
995 mark_inode_dirty(inode);
996
997 if (iattr->ia_valid & ATTR_MODE) {
998 err = nilfs_acl_chmod(inode);
999 if (unlikely(err))
1000 goto out_err;
1001 }
1002
1003 return nilfs_transaction_commit(sb);
1004
1005out_err:
1006 nilfs_transaction_abort(sb);
1007 return err;
1008}
1009
1010int nilfs_permission(struct mnt_idmap *idmap, struct inode *inode,
1011 int mask)
1012{
1013 struct nilfs_root *root = NILFS_I(inode)->i_root;
1014
1015 if ((mask & MAY_WRITE) && root &&
1016 root->cno != NILFS_CPTREE_CURRENT_CNO)
1017 return -EROFS; /* snapshot is not writable */
1018
1019 return generic_permission(&nop_mnt_idmap, inode, mask);
1020}
1021
1022int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
1023{
1024 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1025 struct nilfs_inode_info *ii = NILFS_I(inode);
1026 int err;
1027
1028 spin_lock(&nilfs->ns_inode_lock);
1029 if (ii->i_bh == NULL || unlikely(!buffer_uptodate(ii->i_bh))) {
1030 spin_unlock(&nilfs->ns_inode_lock);
1031 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
1032 inode->i_ino, pbh);
1033 if (unlikely(err))
1034 return err;
1035 spin_lock(&nilfs->ns_inode_lock);
1036 if (ii->i_bh == NULL)
1037 ii->i_bh = *pbh;
1038 else if (unlikely(!buffer_uptodate(ii->i_bh))) {
1039 __brelse(ii->i_bh);
1040 ii->i_bh = *pbh;
1041 } else {
1042 brelse(*pbh);
1043 *pbh = ii->i_bh;
1044 }
1045 } else
1046 *pbh = ii->i_bh;
1047
1048 get_bh(*pbh);
1049 spin_unlock(&nilfs->ns_inode_lock);
1050 return 0;
1051}
1052
1053int nilfs_inode_dirty(struct inode *inode)
1054{
1055 struct nilfs_inode_info *ii = NILFS_I(inode);
1056 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1057 int ret = 0;
1058
1059 if (!list_empty(&ii->i_dirty)) {
1060 spin_lock(&nilfs->ns_inode_lock);
1061 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
1062 test_bit(NILFS_I_BUSY, &ii->i_state);
1063 spin_unlock(&nilfs->ns_inode_lock);
1064 }
1065 return ret;
1066}
1067
1068int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty)
1069{
1070 struct nilfs_inode_info *ii = NILFS_I(inode);
1071 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1072
1073 atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
1074
1075 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
1076 return 0;
1077
1078 spin_lock(&nilfs->ns_inode_lock);
1079 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
1080 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
1081 /*
1082 * Because this routine may race with nilfs_dispose_list(),
1083 * we have to check NILFS_I_QUEUED here, too.
1084 */
1085 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
1086 /*
1087 * This will happen when somebody is freeing
1088 * this inode.
1089 */
1090 nilfs_warn(inode->i_sb,
1091 "cannot set file dirty (ino=%lu): the file is being freed",
1092 inode->i_ino);
1093 spin_unlock(&nilfs->ns_inode_lock);
1094 return -EINVAL; /*
1095 * NILFS_I_DIRTY may remain for
1096 * freeing inode.
1097 */
1098 }
1099 list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
1100 set_bit(NILFS_I_QUEUED, &ii->i_state);
1101 }
1102 spin_unlock(&nilfs->ns_inode_lock);
1103 return 0;
1104}
1105
1106int __nilfs_mark_inode_dirty(struct inode *inode, int flags)
1107{
1108 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1109 struct buffer_head *ibh;
1110 int err;
1111
1112 /*
1113 * Do not dirty inodes after the log writer has been detached
1114 * and its nilfs_root struct has been freed.
1115 */
1116 if (unlikely(nilfs_purging(nilfs)))
1117 return 0;
1118
1119 err = nilfs_load_inode_block(inode, &ibh);
1120 if (unlikely(err)) {
1121 nilfs_warn(inode->i_sb,
1122 "cannot mark inode dirty (ino=%lu): error %d loading inode block",
1123 inode->i_ino, err);
1124 return err;
1125 }
1126 nilfs_update_inode(inode, ibh, flags);
1127 mark_buffer_dirty(ibh);
1128 nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
1129 brelse(ibh);
1130 return 0;
1131}
1132
1133/**
1134 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
1135 * @inode: inode of the file to be registered.
1136 * @flags: flags to determine the dirty state of the inode
1137 *
1138 * nilfs_dirty_inode() loads a inode block containing the specified
1139 * @inode and copies data from a nilfs_inode to a corresponding inode
1140 * entry in the inode block. This operation is excluded from the segment
1141 * construction. This function can be called both as a single operation
1142 * and as a part of indivisible file operations.
1143 */
1144void nilfs_dirty_inode(struct inode *inode, int flags)
1145{
1146 struct nilfs_transaction_info ti;
1147 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
1148
1149 if (is_bad_inode(inode)) {
1150 nilfs_warn(inode->i_sb,
1151 "tried to mark bad_inode dirty. ignored.");
1152 dump_stack();
1153 return;
1154 }
1155 if (mdi) {
1156 nilfs_mdt_mark_dirty(inode);
1157 return;
1158 }
1159 nilfs_transaction_begin(inode->i_sb, &ti, 0);
1160 __nilfs_mark_inode_dirty(inode, flags);
1161 nilfs_transaction_commit(inode->i_sb); /* never fails */
1162}
1163
1164int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1165 __u64 start, __u64 len)
1166{
1167 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1168 __u64 logical = 0, phys = 0, size = 0;
1169 __u32 flags = 0;
1170 loff_t isize;
1171 sector_t blkoff, end_blkoff;
1172 sector_t delalloc_blkoff;
1173 unsigned long delalloc_blklen;
1174 unsigned int blkbits = inode->i_blkbits;
1175 int ret, n;
1176
1177 ret = fiemap_prep(inode, fieinfo, start, &len, 0);
1178 if (ret)
1179 return ret;
1180
1181 inode_lock(inode);
1182
1183 isize = i_size_read(inode);
1184
1185 blkoff = start >> blkbits;
1186 end_blkoff = (start + len - 1) >> blkbits;
1187
1188 delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
1189 &delalloc_blkoff);
1190
1191 do {
1192 __u64 blkphy;
1193 unsigned int maxblocks;
1194
1195 if (delalloc_blklen && blkoff == delalloc_blkoff) {
1196 if (size) {
1197 /* End of the current extent */
1198 ret = fiemap_fill_next_extent(
1199 fieinfo, logical, phys, size, flags);
1200 if (ret)
1201 break;
1202 }
1203 if (blkoff > end_blkoff)
1204 break;
1205
1206 flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
1207 logical = blkoff << blkbits;
1208 phys = 0;
1209 size = delalloc_blklen << blkbits;
1210
1211 blkoff = delalloc_blkoff + delalloc_blklen;
1212 delalloc_blklen = nilfs_find_uncommitted_extent(
1213 inode, blkoff, &delalloc_blkoff);
1214 continue;
1215 }
1216
1217 /*
1218 * Limit the number of blocks that we look up so as
1219 * not to get into the next delayed allocation extent.
1220 */
1221 maxblocks = INT_MAX;
1222 if (delalloc_blklen)
1223 maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
1224 maxblocks);
1225 blkphy = 0;
1226
1227 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1228 n = nilfs_bmap_lookup_contig(
1229 NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
1230 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1231
1232 if (n < 0) {
1233 int past_eof;
1234
1235 if (unlikely(n != -ENOENT))
1236 break; /* error */
1237
1238 /* HOLE */
1239 blkoff++;
1240 past_eof = ((blkoff << blkbits) >= isize);
1241
1242 if (size) {
1243 /* End of the current extent */
1244
1245 if (past_eof)
1246 flags |= FIEMAP_EXTENT_LAST;
1247
1248 ret = fiemap_fill_next_extent(
1249 fieinfo, logical, phys, size, flags);
1250 if (ret)
1251 break;
1252 size = 0;
1253 }
1254 if (blkoff > end_blkoff || past_eof)
1255 break;
1256 } else {
1257 if (size) {
1258 if (phys && blkphy << blkbits == phys + size) {
1259 /* The current extent goes on */
1260 size += n << blkbits;
1261 } else {
1262 /* Terminate the current extent */
1263 ret = fiemap_fill_next_extent(
1264 fieinfo, logical, phys, size,
1265 flags);
1266 if (ret || blkoff > end_blkoff)
1267 break;
1268
1269 /* Start another extent */
1270 flags = FIEMAP_EXTENT_MERGED;
1271 logical = blkoff << blkbits;
1272 phys = blkphy << blkbits;
1273 size = n << blkbits;
1274 }
1275 } else {
1276 /* Start a new extent */
1277 flags = FIEMAP_EXTENT_MERGED;
1278 logical = blkoff << blkbits;
1279 phys = blkphy << blkbits;
1280 size = n << blkbits;
1281 }
1282 blkoff += n;
1283 }
1284 cond_resched();
1285 } while (true);
1286
1287 /* If ret is 1 then we just hit the end of the extent array */
1288 if (ret == 1)
1289 ret = 0;
1290
1291 inode_unlock(inode);
1292 return ret;
1293}
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * inode.c - NILFS inode operations.
4 *
5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Written by Ryusuke Konishi.
8 *
9 */
10
11#include <linux/buffer_head.h>
12#include <linux/gfp.h>
13#include <linux/mpage.h>
14#include <linux/pagemap.h>
15#include <linux/writeback.h>
16#include <linux/uio.h>
17#include "nilfs.h"
18#include "btnode.h"
19#include "segment.h"
20#include "page.h"
21#include "mdt.h"
22#include "cpfile.h"
23#include "ifile.h"
24
25/**
26 * struct nilfs_iget_args - arguments used during comparison between inodes
27 * @ino: inode number
28 * @cno: checkpoint number
29 * @root: pointer on NILFS root object (mounted checkpoint)
30 * @for_gc: inode for GC flag
31 */
32struct nilfs_iget_args {
33 u64 ino;
34 __u64 cno;
35 struct nilfs_root *root;
36 int for_gc;
37};
38
39static int nilfs_iget_test(struct inode *inode, void *opaque);
40
41void nilfs_inode_add_blocks(struct inode *inode, int n)
42{
43 struct nilfs_root *root = NILFS_I(inode)->i_root;
44
45 inode_add_bytes(inode, i_blocksize(inode) * n);
46 if (root)
47 atomic64_add(n, &root->blocks_count);
48}
49
50void nilfs_inode_sub_blocks(struct inode *inode, int n)
51{
52 struct nilfs_root *root = NILFS_I(inode)->i_root;
53
54 inode_sub_bytes(inode, i_blocksize(inode) * n);
55 if (root)
56 atomic64_sub(n, &root->blocks_count);
57}
58
59/**
60 * nilfs_get_block() - get a file block on the filesystem (callback function)
61 * @inode - inode struct of the target file
62 * @blkoff - file block number
63 * @bh_result - buffer head to be mapped on
64 * @create - indicate whether allocating the block or not when it has not
65 * been allocated yet.
66 *
67 * This function does not issue actual read request of the specified data
68 * block. It is done by VFS.
69 */
70int nilfs_get_block(struct inode *inode, sector_t blkoff,
71 struct buffer_head *bh_result, int create)
72{
73 struct nilfs_inode_info *ii = NILFS_I(inode);
74 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
75 __u64 blknum = 0;
76 int err = 0, ret;
77 unsigned int maxblocks = bh_result->b_size >> inode->i_blkbits;
78
79 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
80 ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
81 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
82 if (ret >= 0) { /* found */
83 map_bh(bh_result, inode->i_sb, blknum);
84 if (ret > 0)
85 bh_result->b_size = (ret << inode->i_blkbits);
86 goto out;
87 }
88 /* data block was not found */
89 if (ret == -ENOENT && create) {
90 struct nilfs_transaction_info ti;
91
92 bh_result->b_blocknr = 0;
93 err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
94 if (unlikely(err))
95 goto out;
96 err = nilfs_bmap_insert(ii->i_bmap, blkoff,
97 (unsigned long)bh_result);
98 if (unlikely(err != 0)) {
99 if (err == -EEXIST) {
100 /*
101 * The get_block() function could be called
102 * from multiple callers for an inode.
103 * However, the page having this block must
104 * be locked in this case.
105 */
106 nilfs_msg(inode->i_sb, KERN_WARNING,
107 "%s (ino=%lu): a race condition while inserting a data block at offset=%llu",
108 __func__, inode->i_ino,
109 (unsigned long long)blkoff);
110 err = 0;
111 }
112 nilfs_transaction_abort(inode->i_sb);
113 goto out;
114 }
115 nilfs_mark_inode_dirty_sync(inode);
116 nilfs_transaction_commit(inode->i_sb); /* never fails */
117 /* Error handling should be detailed */
118 set_buffer_new(bh_result);
119 set_buffer_delay(bh_result);
120 map_bh(bh_result, inode->i_sb, 0);
121 /* Disk block number must be changed to proper value */
122
123 } else if (ret == -ENOENT) {
124 /*
125 * not found is not error (e.g. hole); must return without
126 * the mapped state flag.
127 */
128 ;
129 } else {
130 err = ret;
131 }
132
133 out:
134 return err;
135}
136
137/**
138 * nilfs_readpage() - implement readpage() method of nilfs_aops {}
139 * address_space_operations.
140 * @file - file struct of the file to be read
141 * @page - the page to be read
142 */
143static int nilfs_readpage(struct file *file, struct page *page)
144{
145 return mpage_readpage(page, nilfs_get_block);
146}
147
148/**
149 * nilfs_readpages() - implement readpages() method of nilfs_aops {}
150 * address_space_operations.
151 * @file - file struct of the file to be read
152 * @mapping - address_space struct used for reading multiple pages
153 * @pages - the pages to be read
154 * @nr_pages - number of pages to be read
155 */
156static int nilfs_readpages(struct file *file, struct address_space *mapping,
157 struct list_head *pages, unsigned int nr_pages)
158{
159 return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
160}
161
162static int nilfs_writepages(struct address_space *mapping,
163 struct writeback_control *wbc)
164{
165 struct inode *inode = mapping->host;
166 int err = 0;
167
168 if (sb_rdonly(inode->i_sb)) {
169 nilfs_clear_dirty_pages(mapping, false);
170 return -EROFS;
171 }
172
173 if (wbc->sync_mode == WB_SYNC_ALL)
174 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
175 wbc->range_start,
176 wbc->range_end);
177 return err;
178}
179
180static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
181{
182 struct inode *inode = page->mapping->host;
183 int err;
184
185 if (sb_rdonly(inode->i_sb)) {
186 /*
187 * It means that filesystem was remounted in read-only
188 * mode because of error or metadata corruption. But we
189 * have dirty pages that try to be flushed in background.
190 * So, here we simply discard this dirty page.
191 */
192 nilfs_clear_dirty_page(page, false);
193 unlock_page(page);
194 return -EROFS;
195 }
196
197 redirty_page_for_writepage(wbc, page);
198 unlock_page(page);
199
200 if (wbc->sync_mode == WB_SYNC_ALL) {
201 err = nilfs_construct_segment(inode->i_sb);
202 if (unlikely(err))
203 return err;
204 } else if (wbc->for_reclaim)
205 nilfs_flush_segment(inode->i_sb, inode->i_ino);
206
207 return 0;
208}
209
210static int nilfs_set_page_dirty(struct page *page)
211{
212 struct inode *inode = page->mapping->host;
213 int ret = __set_page_dirty_nobuffers(page);
214
215 if (page_has_buffers(page)) {
216 unsigned int nr_dirty = 0;
217 struct buffer_head *bh, *head;
218
219 /*
220 * This page is locked by callers, and no other thread
221 * concurrently marks its buffers dirty since they are
222 * only dirtied through routines in fs/buffer.c in
223 * which call sites of mark_buffer_dirty are protected
224 * by page lock.
225 */
226 bh = head = page_buffers(page);
227 do {
228 /* Do not mark hole blocks dirty */
229 if (buffer_dirty(bh) || !buffer_mapped(bh))
230 continue;
231
232 set_buffer_dirty(bh);
233 nr_dirty++;
234 } while (bh = bh->b_this_page, bh != head);
235
236 if (nr_dirty)
237 nilfs_set_file_dirty(inode, nr_dirty);
238 } else if (ret) {
239 unsigned int nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
240
241 nilfs_set_file_dirty(inode, nr_dirty);
242 }
243 return ret;
244}
245
246void nilfs_write_failed(struct address_space *mapping, loff_t to)
247{
248 struct inode *inode = mapping->host;
249
250 if (to > inode->i_size) {
251 truncate_pagecache(inode, inode->i_size);
252 nilfs_truncate(inode);
253 }
254}
255
256static int nilfs_write_begin(struct file *file, struct address_space *mapping,
257 loff_t pos, unsigned len, unsigned flags,
258 struct page **pagep, void **fsdata)
259
260{
261 struct inode *inode = mapping->host;
262 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
263
264 if (unlikely(err))
265 return err;
266
267 err = block_write_begin(mapping, pos, len, flags, pagep,
268 nilfs_get_block);
269 if (unlikely(err)) {
270 nilfs_write_failed(mapping, pos + len);
271 nilfs_transaction_abort(inode->i_sb);
272 }
273 return err;
274}
275
276static int nilfs_write_end(struct file *file, struct address_space *mapping,
277 loff_t pos, unsigned len, unsigned copied,
278 struct page *page, void *fsdata)
279{
280 struct inode *inode = mapping->host;
281 unsigned int start = pos & (PAGE_SIZE - 1);
282 unsigned int nr_dirty;
283 int err;
284
285 nr_dirty = nilfs_page_count_clean_buffers(page, start,
286 start + copied);
287 copied = generic_write_end(file, mapping, pos, len, copied, page,
288 fsdata);
289 nilfs_set_file_dirty(inode, nr_dirty);
290 err = nilfs_transaction_commit(inode->i_sb);
291 return err ? : copied;
292}
293
294static ssize_t
295nilfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
296{
297 struct inode *inode = file_inode(iocb->ki_filp);
298
299 if (iov_iter_rw(iter) == WRITE)
300 return 0;
301
302 /* Needs synchronization with the cleaner */
303 return blockdev_direct_IO(iocb, inode, iter, nilfs_get_block);
304}
305
306const struct address_space_operations nilfs_aops = {
307 .writepage = nilfs_writepage,
308 .readpage = nilfs_readpage,
309 .writepages = nilfs_writepages,
310 .set_page_dirty = nilfs_set_page_dirty,
311 .readpages = nilfs_readpages,
312 .write_begin = nilfs_write_begin,
313 .write_end = nilfs_write_end,
314 /* .releasepage = nilfs_releasepage, */
315 .invalidatepage = block_invalidatepage,
316 .direct_IO = nilfs_direct_IO,
317 .is_partially_uptodate = block_is_partially_uptodate,
318};
319
320static int nilfs_insert_inode_locked(struct inode *inode,
321 struct nilfs_root *root,
322 unsigned long ino)
323{
324 struct nilfs_iget_args args = {
325 .ino = ino, .root = root, .cno = 0, .for_gc = 0
326 };
327
328 return insert_inode_locked4(inode, ino, nilfs_iget_test, &args);
329}
330
331struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
332{
333 struct super_block *sb = dir->i_sb;
334 struct the_nilfs *nilfs = sb->s_fs_info;
335 struct inode *inode;
336 struct nilfs_inode_info *ii;
337 struct nilfs_root *root;
338 int err = -ENOMEM;
339 ino_t ino;
340
341 inode = new_inode(sb);
342 if (unlikely(!inode))
343 goto failed;
344
345 mapping_set_gfp_mask(inode->i_mapping,
346 mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
347
348 root = NILFS_I(dir)->i_root;
349 ii = NILFS_I(inode);
350 ii->i_state = BIT(NILFS_I_NEW);
351 ii->i_root = root;
352
353 err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
354 if (unlikely(err))
355 goto failed_ifile_create_inode;
356 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
357
358 atomic64_inc(&root->inodes_count);
359 inode_init_owner(inode, dir, mode);
360 inode->i_ino = ino;
361 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
362
363 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
364 err = nilfs_bmap_read(ii->i_bmap, NULL);
365 if (err < 0)
366 goto failed_after_creation;
367
368 set_bit(NILFS_I_BMAP, &ii->i_state);
369 /* No lock is needed; iget() ensures it. */
370 }
371
372 ii->i_flags = nilfs_mask_flags(
373 mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED);
374
375 /* ii->i_file_acl = 0; */
376 /* ii->i_dir_acl = 0; */
377 ii->i_dir_start_lookup = 0;
378 nilfs_set_inode_flags(inode);
379 spin_lock(&nilfs->ns_next_gen_lock);
380 inode->i_generation = nilfs->ns_next_generation++;
381 spin_unlock(&nilfs->ns_next_gen_lock);
382 if (nilfs_insert_inode_locked(inode, root, ino) < 0) {
383 err = -EIO;
384 goto failed_after_creation;
385 }
386
387 err = nilfs_init_acl(inode, dir);
388 if (unlikely(err))
389 /*
390 * Never occur. When supporting nilfs_init_acl(),
391 * proper cancellation of above jobs should be considered.
392 */
393 goto failed_after_creation;
394
395 return inode;
396
397 failed_after_creation:
398 clear_nlink(inode);
399 unlock_new_inode(inode);
400 iput(inode); /*
401 * raw_inode will be deleted through
402 * nilfs_evict_inode().
403 */
404 goto failed;
405
406 failed_ifile_create_inode:
407 make_bad_inode(inode);
408 iput(inode);
409 failed:
410 return ERR_PTR(err);
411}
412
413void nilfs_set_inode_flags(struct inode *inode)
414{
415 unsigned int flags = NILFS_I(inode)->i_flags;
416 unsigned int new_fl = 0;
417
418 if (flags & FS_SYNC_FL)
419 new_fl |= S_SYNC;
420 if (flags & FS_APPEND_FL)
421 new_fl |= S_APPEND;
422 if (flags & FS_IMMUTABLE_FL)
423 new_fl |= S_IMMUTABLE;
424 if (flags & FS_NOATIME_FL)
425 new_fl |= S_NOATIME;
426 if (flags & FS_DIRSYNC_FL)
427 new_fl |= S_DIRSYNC;
428 inode_set_flags(inode, new_fl, S_SYNC | S_APPEND | S_IMMUTABLE |
429 S_NOATIME | S_DIRSYNC);
430}
431
432int nilfs_read_inode_common(struct inode *inode,
433 struct nilfs_inode *raw_inode)
434{
435 struct nilfs_inode_info *ii = NILFS_I(inode);
436 int err;
437
438 inode->i_mode = le16_to_cpu(raw_inode->i_mode);
439 i_uid_write(inode, le32_to_cpu(raw_inode->i_uid));
440 i_gid_write(inode, le32_to_cpu(raw_inode->i_gid));
441 set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
442 inode->i_size = le64_to_cpu(raw_inode->i_size);
443 inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
444 inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
445 inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
446 inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
447 inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
448 inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
449 if (inode->i_nlink == 0)
450 return -ESTALE; /* this inode is deleted */
451
452 inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
453 ii->i_flags = le32_to_cpu(raw_inode->i_flags);
454#if 0
455 ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
456 ii->i_dir_acl = S_ISREG(inode->i_mode) ?
457 0 : le32_to_cpu(raw_inode->i_dir_acl);
458#endif
459 ii->i_dir_start_lookup = 0;
460 inode->i_generation = le32_to_cpu(raw_inode->i_generation);
461
462 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
463 S_ISLNK(inode->i_mode)) {
464 err = nilfs_bmap_read(ii->i_bmap, raw_inode);
465 if (err < 0)
466 return err;
467 set_bit(NILFS_I_BMAP, &ii->i_state);
468 /* No lock is needed; iget() ensures it. */
469 }
470 return 0;
471}
472
473static int __nilfs_read_inode(struct super_block *sb,
474 struct nilfs_root *root, unsigned long ino,
475 struct inode *inode)
476{
477 struct the_nilfs *nilfs = sb->s_fs_info;
478 struct buffer_head *bh;
479 struct nilfs_inode *raw_inode;
480 int err;
481
482 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
483 err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
484 if (unlikely(err))
485 goto bad_inode;
486
487 raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
488
489 err = nilfs_read_inode_common(inode, raw_inode);
490 if (err)
491 goto failed_unmap;
492
493 if (S_ISREG(inode->i_mode)) {
494 inode->i_op = &nilfs_file_inode_operations;
495 inode->i_fop = &nilfs_file_operations;
496 inode->i_mapping->a_ops = &nilfs_aops;
497 } else if (S_ISDIR(inode->i_mode)) {
498 inode->i_op = &nilfs_dir_inode_operations;
499 inode->i_fop = &nilfs_dir_operations;
500 inode->i_mapping->a_ops = &nilfs_aops;
501 } else if (S_ISLNK(inode->i_mode)) {
502 inode->i_op = &nilfs_symlink_inode_operations;
503 inode_nohighmem(inode);
504 inode->i_mapping->a_ops = &nilfs_aops;
505 } else {
506 inode->i_op = &nilfs_special_inode_operations;
507 init_special_inode(
508 inode, inode->i_mode,
509 huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
510 }
511 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
512 brelse(bh);
513 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
514 nilfs_set_inode_flags(inode);
515 mapping_set_gfp_mask(inode->i_mapping,
516 mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
517 return 0;
518
519 failed_unmap:
520 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
521 brelse(bh);
522
523 bad_inode:
524 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
525 return err;
526}
527
528static int nilfs_iget_test(struct inode *inode, void *opaque)
529{
530 struct nilfs_iget_args *args = opaque;
531 struct nilfs_inode_info *ii;
532
533 if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
534 return 0;
535
536 ii = NILFS_I(inode);
537 if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
538 return !args->for_gc;
539
540 return args->for_gc && args->cno == ii->i_cno;
541}
542
543static int nilfs_iget_set(struct inode *inode, void *opaque)
544{
545 struct nilfs_iget_args *args = opaque;
546
547 inode->i_ino = args->ino;
548 if (args->for_gc) {
549 NILFS_I(inode)->i_state = BIT(NILFS_I_GCINODE);
550 NILFS_I(inode)->i_cno = args->cno;
551 NILFS_I(inode)->i_root = NULL;
552 } else {
553 if (args->root && args->ino == NILFS_ROOT_INO)
554 nilfs_get_root(args->root);
555 NILFS_I(inode)->i_root = args->root;
556 }
557 return 0;
558}
559
560struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
561 unsigned long ino)
562{
563 struct nilfs_iget_args args = {
564 .ino = ino, .root = root, .cno = 0, .for_gc = 0
565 };
566
567 return ilookup5(sb, ino, nilfs_iget_test, &args);
568}
569
570struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
571 unsigned long ino)
572{
573 struct nilfs_iget_args args = {
574 .ino = ino, .root = root, .cno = 0, .for_gc = 0
575 };
576
577 return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
578}
579
580struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
581 unsigned long ino)
582{
583 struct inode *inode;
584 int err;
585
586 inode = nilfs_iget_locked(sb, root, ino);
587 if (unlikely(!inode))
588 return ERR_PTR(-ENOMEM);
589 if (!(inode->i_state & I_NEW))
590 return inode;
591
592 err = __nilfs_read_inode(sb, root, ino, inode);
593 if (unlikely(err)) {
594 iget_failed(inode);
595 return ERR_PTR(err);
596 }
597 unlock_new_inode(inode);
598 return inode;
599}
600
601struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
602 __u64 cno)
603{
604 struct nilfs_iget_args args = {
605 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
606 };
607 struct inode *inode;
608 int err;
609
610 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
611 if (unlikely(!inode))
612 return ERR_PTR(-ENOMEM);
613 if (!(inode->i_state & I_NEW))
614 return inode;
615
616 err = nilfs_init_gcinode(inode);
617 if (unlikely(err)) {
618 iget_failed(inode);
619 return ERR_PTR(err);
620 }
621 unlock_new_inode(inode);
622 return inode;
623}
624
625void nilfs_write_inode_common(struct inode *inode,
626 struct nilfs_inode *raw_inode, int has_bmap)
627{
628 struct nilfs_inode_info *ii = NILFS_I(inode);
629
630 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
631 raw_inode->i_uid = cpu_to_le32(i_uid_read(inode));
632 raw_inode->i_gid = cpu_to_le32(i_gid_read(inode));
633 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
634 raw_inode->i_size = cpu_to_le64(inode->i_size);
635 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
636 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
637 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
638 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
639 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
640
641 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
642 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
643
644 if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) {
645 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
646
647 /* zero-fill unused portion in the case of super root block */
648 raw_inode->i_xattr = 0;
649 raw_inode->i_pad = 0;
650 memset((void *)raw_inode + sizeof(*raw_inode), 0,
651 nilfs->ns_inode_size - sizeof(*raw_inode));
652 }
653
654 if (has_bmap)
655 nilfs_bmap_write(ii->i_bmap, raw_inode);
656 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
657 raw_inode->i_device_code =
658 cpu_to_le64(huge_encode_dev(inode->i_rdev));
659 /*
660 * When extending inode, nilfs->ns_inode_size should be checked
661 * for substitutions of appended fields.
662 */
663}
664
665void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh, int flags)
666{
667 ino_t ino = inode->i_ino;
668 struct nilfs_inode_info *ii = NILFS_I(inode);
669 struct inode *ifile = ii->i_root->ifile;
670 struct nilfs_inode *raw_inode;
671
672 raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
673
674 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
675 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
676 if (flags & I_DIRTY_DATASYNC)
677 set_bit(NILFS_I_INODE_SYNC, &ii->i_state);
678
679 nilfs_write_inode_common(inode, raw_inode, 0);
680 /*
681 * XXX: call with has_bmap = 0 is a workaround to avoid
682 * deadlock of bmap. This delays update of i_bmap to just
683 * before writing.
684 */
685
686 nilfs_ifile_unmap_inode(ifile, ino, ibh);
687}
688
689#define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
690
691static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
692 unsigned long from)
693{
694 __u64 b;
695 int ret;
696
697 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
698 return;
699repeat:
700 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
701 if (ret == -ENOENT)
702 return;
703 else if (ret < 0)
704 goto failed;
705
706 if (b < from)
707 return;
708
709 b -= min_t(__u64, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
710 ret = nilfs_bmap_truncate(ii->i_bmap, b);
711 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
712 if (!ret || (ret == -ENOMEM &&
713 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
714 goto repeat;
715
716failed:
717 nilfs_msg(ii->vfs_inode.i_sb, KERN_WARNING,
718 "error %d truncating bmap (ino=%lu)", ret,
719 ii->vfs_inode.i_ino);
720}
721
722void nilfs_truncate(struct inode *inode)
723{
724 unsigned long blkoff;
725 unsigned int blocksize;
726 struct nilfs_transaction_info ti;
727 struct super_block *sb = inode->i_sb;
728 struct nilfs_inode_info *ii = NILFS_I(inode);
729
730 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
731 return;
732 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
733 return;
734
735 blocksize = sb->s_blocksize;
736 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
737 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
738
739 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
740
741 nilfs_truncate_bmap(ii, blkoff);
742
743 inode->i_mtime = inode->i_ctime = current_time(inode);
744 if (IS_SYNC(inode))
745 nilfs_set_transaction_flag(NILFS_TI_SYNC);
746
747 nilfs_mark_inode_dirty(inode);
748 nilfs_set_file_dirty(inode, 0);
749 nilfs_transaction_commit(sb);
750 /*
751 * May construct a logical segment and may fail in sync mode.
752 * But truncate has no return value.
753 */
754}
755
756static void nilfs_clear_inode(struct inode *inode)
757{
758 struct nilfs_inode_info *ii = NILFS_I(inode);
759
760 /*
761 * Free resources allocated in nilfs_read_inode(), here.
762 */
763 BUG_ON(!list_empty(&ii->i_dirty));
764 brelse(ii->i_bh);
765 ii->i_bh = NULL;
766
767 if (nilfs_is_metadata_file_inode(inode))
768 nilfs_mdt_clear(inode);
769
770 if (test_bit(NILFS_I_BMAP, &ii->i_state))
771 nilfs_bmap_clear(ii->i_bmap);
772
773 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
774
775 if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
776 nilfs_put_root(ii->i_root);
777}
778
779void nilfs_evict_inode(struct inode *inode)
780{
781 struct nilfs_transaction_info ti;
782 struct super_block *sb = inode->i_sb;
783 struct nilfs_inode_info *ii = NILFS_I(inode);
784 int ret;
785
786 if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
787 truncate_inode_pages_final(&inode->i_data);
788 clear_inode(inode);
789 nilfs_clear_inode(inode);
790 return;
791 }
792 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
793
794 truncate_inode_pages_final(&inode->i_data);
795
796 /* TODO: some of the following operations may fail. */
797 nilfs_truncate_bmap(ii, 0);
798 nilfs_mark_inode_dirty(inode);
799 clear_inode(inode);
800
801 ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
802 if (!ret)
803 atomic64_dec(&ii->i_root->inodes_count);
804
805 nilfs_clear_inode(inode);
806
807 if (IS_SYNC(inode))
808 nilfs_set_transaction_flag(NILFS_TI_SYNC);
809 nilfs_transaction_commit(sb);
810 /*
811 * May construct a logical segment and may fail in sync mode.
812 * But delete_inode has no return value.
813 */
814}
815
816int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
817{
818 struct nilfs_transaction_info ti;
819 struct inode *inode = d_inode(dentry);
820 struct super_block *sb = inode->i_sb;
821 int err;
822
823 err = setattr_prepare(dentry, iattr);
824 if (err)
825 return err;
826
827 err = nilfs_transaction_begin(sb, &ti, 0);
828 if (unlikely(err))
829 return err;
830
831 if ((iattr->ia_valid & ATTR_SIZE) &&
832 iattr->ia_size != i_size_read(inode)) {
833 inode_dio_wait(inode);
834 truncate_setsize(inode, iattr->ia_size);
835 nilfs_truncate(inode);
836 }
837
838 setattr_copy(inode, iattr);
839 mark_inode_dirty(inode);
840
841 if (iattr->ia_valid & ATTR_MODE) {
842 err = nilfs_acl_chmod(inode);
843 if (unlikely(err))
844 goto out_err;
845 }
846
847 return nilfs_transaction_commit(sb);
848
849out_err:
850 nilfs_transaction_abort(sb);
851 return err;
852}
853
854int nilfs_permission(struct inode *inode, int mask)
855{
856 struct nilfs_root *root = NILFS_I(inode)->i_root;
857
858 if ((mask & MAY_WRITE) && root &&
859 root->cno != NILFS_CPTREE_CURRENT_CNO)
860 return -EROFS; /* snapshot is not writable */
861
862 return generic_permission(inode, mask);
863}
864
865int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
866{
867 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
868 struct nilfs_inode_info *ii = NILFS_I(inode);
869 int err;
870
871 spin_lock(&nilfs->ns_inode_lock);
872 if (ii->i_bh == NULL) {
873 spin_unlock(&nilfs->ns_inode_lock);
874 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
875 inode->i_ino, pbh);
876 if (unlikely(err))
877 return err;
878 spin_lock(&nilfs->ns_inode_lock);
879 if (ii->i_bh == NULL)
880 ii->i_bh = *pbh;
881 else {
882 brelse(*pbh);
883 *pbh = ii->i_bh;
884 }
885 } else
886 *pbh = ii->i_bh;
887
888 get_bh(*pbh);
889 spin_unlock(&nilfs->ns_inode_lock);
890 return 0;
891}
892
893int nilfs_inode_dirty(struct inode *inode)
894{
895 struct nilfs_inode_info *ii = NILFS_I(inode);
896 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
897 int ret = 0;
898
899 if (!list_empty(&ii->i_dirty)) {
900 spin_lock(&nilfs->ns_inode_lock);
901 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
902 test_bit(NILFS_I_BUSY, &ii->i_state);
903 spin_unlock(&nilfs->ns_inode_lock);
904 }
905 return ret;
906}
907
908int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty)
909{
910 struct nilfs_inode_info *ii = NILFS_I(inode);
911 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
912
913 atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
914
915 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
916 return 0;
917
918 spin_lock(&nilfs->ns_inode_lock);
919 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
920 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
921 /*
922 * Because this routine may race with nilfs_dispose_list(),
923 * we have to check NILFS_I_QUEUED here, too.
924 */
925 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
926 /*
927 * This will happen when somebody is freeing
928 * this inode.
929 */
930 nilfs_msg(inode->i_sb, KERN_WARNING,
931 "cannot set file dirty (ino=%lu): the file is being freed",
932 inode->i_ino);
933 spin_unlock(&nilfs->ns_inode_lock);
934 return -EINVAL; /*
935 * NILFS_I_DIRTY may remain for
936 * freeing inode.
937 */
938 }
939 list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
940 set_bit(NILFS_I_QUEUED, &ii->i_state);
941 }
942 spin_unlock(&nilfs->ns_inode_lock);
943 return 0;
944}
945
946int __nilfs_mark_inode_dirty(struct inode *inode, int flags)
947{
948 struct buffer_head *ibh;
949 int err;
950
951 err = nilfs_load_inode_block(inode, &ibh);
952 if (unlikely(err)) {
953 nilfs_msg(inode->i_sb, KERN_WARNING,
954 "cannot mark inode dirty (ino=%lu): error %d loading inode block",
955 inode->i_ino, err);
956 return err;
957 }
958 nilfs_update_inode(inode, ibh, flags);
959 mark_buffer_dirty(ibh);
960 nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
961 brelse(ibh);
962 return 0;
963}
964
965/**
966 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
967 * @inode: inode of the file to be registered.
968 *
969 * nilfs_dirty_inode() loads a inode block containing the specified
970 * @inode and copies data from a nilfs_inode to a corresponding inode
971 * entry in the inode block. This operation is excluded from the segment
972 * construction. This function can be called both as a single operation
973 * and as a part of indivisible file operations.
974 */
975void nilfs_dirty_inode(struct inode *inode, int flags)
976{
977 struct nilfs_transaction_info ti;
978 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
979
980 if (is_bad_inode(inode)) {
981 nilfs_msg(inode->i_sb, KERN_WARNING,
982 "tried to mark bad_inode dirty. ignored.");
983 dump_stack();
984 return;
985 }
986 if (mdi) {
987 nilfs_mdt_mark_dirty(inode);
988 return;
989 }
990 nilfs_transaction_begin(inode->i_sb, &ti, 0);
991 __nilfs_mark_inode_dirty(inode, flags);
992 nilfs_transaction_commit(inode->i_sb); /* never fails */
993}
994
995int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
996 __u64 start, __u64 len)
997{
998 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
999 __u64 logical = 0, phys = 0, size = 0;
1000 __u32 flags = 0;
1001 loff_t isize;
1002 sector_t blkoff, end_blkoff;
1003 sector_t delalloc_blkoff;
1004 unsigned long delalloc_blklen;
1005 unsigned int blkbits = inode->i_blkbits;
1006 int ret, n;
1007
1008 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1009 if (ret)
1010 return ret;
1011
1012 inode_lock(inode);
1013
1014 isize = i_size_read(inode);
1015
1016 blkoff = start >> blkbits;
1017 end_blkoff = (start + len - 1) >> blkbits;
1018
1019 delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
1020 &delalloc_blkoff);
1021
1022 do {
1023 __u64 blkphy;
1024 unsigned int maxblocks;
1025
1026 if (delalloc_blklen && blkoff == delalloc_blkoff) {
1027 if (size) {
1028 /* End of the current extent */
1029 ret = fiemap_fill_next_extent(
1030 fieinfo, logical, phys, size, flags);
1031 if (ret)
1032 break;
1033 }
1034 if (blkoff > end_blkoff)
1035 break;
1036
1037 flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
1038 logical = blkoff << blkbits;
1039 phys = 0;
1040 size = delalloc_blklen << blkbits;
1041
1042 blkoff = delalloc_blkoff + delalloc_blklen;
1043 delalloc_blklen = nilfs_find_uncommitted_extent(
1044 inode, blkoff, &delalloc_blkoff);
1045 continue;
1046 }
1047
1048 /*
1049 * Limit the number of blocks that we look up so as
1050 * not to get into the next delayed allocation extent.
1051 */
1052 maxblocks = INT_MAX;
1053 if (delalloc_blklen)
1054 maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
1055 maxblocks);
1056 blkphy = 0;
1057
1058 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1059 n = nilfs_bmap_lookup_contig(
1060 NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
1061 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1062
1063 if (n < 0) {
1064 int past_eof;
1065
1066 if (unlikely(n != -ENOENT))
1067 break; /* error */
1068
1069 /* HOLE */
1070 blkoff++;
1071 past_eof = ((blkoff << blkbits) >= isize);
1072
1073 if (size) {
1074 /* End of the current extent */
1075
1076 if (past_eof)
1077 flags |= FIEMAP_EXTENT_LAST;
1078
1079 ret = fiemap_fill_next_extent(
1080 fieinfo, logical, phys, size, flags);
1081 if (ret)
1082 break;
1083 size = 0;
1084 }
1085 if (blkoff > end_blkoff || past_eof)
1086 break;
1087 } else {
1088 if (size) {
1089 if (phys && blkphy << blkbits == phys + size) {
1090 /* The current extent goes on */
1091 size += n << blkbits;
1092 } else {
1093 /* Terminate the current extent */
1094 ret = fiemap_fill_next_extent(
1095 fieinfo, logical, phys, size,
1096 flags);
1097 if (ret || blkoff > end_blkoff)
1098 break;
1099
1100 /* Start another extent */
1101 flags = FIEMAP_EXTENT_MERGED;
1102 logical = blkoff << blkbits;
1103 phys = blkphy << blkbits;
1104 size = n << blkbits;
1105 }
1106 } else {
1107 /* Start a new extent */
1108 flags = FIEMAP_EXTENT_MERGED;
1109 logical = blkoff << blkbits;
1110 phys = blkphy << blkbits;
1111 size = n << blkbits;
1112 }
1113 blkoff += n;
1114 }
1115 cond_resched();
1116 } while (true);
1117
1118 /* If ret is 1 then we just hit the end of the extent array */
1119 if (ret == 1)
1120 ret = 0;
1121
1122 inode_unlock(inode);
1123 return ret;
1124}