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