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Merge tag 'sound-4.19-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
[mirror_ubuntu-eoan-kernel.git] / fs / nilfs2 / inode.c
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 */
32 struct nilfs_iget_args {
33 u64 ino;
34 __u64 cno;
35 struct nilfs_root *root;
36 int for_gc;
37 };
38
39 static int nilfs_iget_test(struct inode *inode, void *opaque);
40
41 void 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
50 void 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 */
70 int 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 */
143 static 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 */
156 static 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
162 static 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
180 static 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
210 static 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
246 void 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
256 static 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
276 static 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
294 static ssize_t
295 nilfs_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
306 const 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
320 static 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
331 struct 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
413 void 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
432 int 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
473 static 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
528 static 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
543 static 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
560 struct 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
570 struct 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
580 struct 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
601 struct 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
625 void 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
665 void 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
691 static 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;
699 repeat:
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
716 failed:
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
722 void 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
756 static 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
779 void 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
816 int 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
849 out_err:
850 nilfs_transaction_abort(sb);
851 return err;
852 }
853
854 int 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
865 int 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
893 int 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
908 int 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
946 int __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 */
975 void 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
995 int 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 }
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