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[mirror_ubuntu-zesty-kernel.git] / fs / nilfs2 / inode.c
CommitLineData
05fe58fd
RK
1/*
2 * inode.c - NILFS inode operations.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
4b420ab4 16 * Written by Ryusuke Konishi.
05fe58fd
RK
17 *
18 */
19
20#include <linux/buffer_head.h>
5a0e3ad6 21#include <linux/gfp.h>
05fe58fd 22#include <linux/mpage.h>
56d7acc7 23#include <linux/pagemap.h>
05fe58fd 24#include <linux/writeback.h>
e2e40f2c 25#include <linux/uio.h>
05fe58fd 26#include "nilfs.h"
6fd1e5c9 27#include "btnode.h"
05fe58fd
RK
28#include "segment.h"
29#include "page.h"
30#include "mdt.h"
31#include "cpfile.h"
32#include "ifile.h"
33
f5974c8f
VD
34/**
35 * struct nilfs_iget_args - arguments used during comparison between inodes
36 * @ino: inode number
37 * @cno: checkpoint number
38 * @root: pointer on NILFS root object (mounted checkpoint)
39 * @for_gc: inode for GC flag
40 */
0e14a359
RK
41struct nilfs_iget_args {
42 u64 ino;
43 __u64 cno;
4d8d9293 44 struct nilfs_root *root;
0e14a359
RK
45 int for_gc;
46};
05fe58fd 47
705304a8
RK
48static int nilfs_iget_test(struct inode *inode, void *opaque);
49
be667377
RK
50void nilfs_inode_add_blocks(struct inode *inode, int n)
51{
52 struct nilfs_root *root = NILFS_I(inode)->i_root;
53
54 inode_add_bytes(inode, (1 << inode->i_blkbits) * n);
55 if (root)
e5f7f848 56 atomic64_add(n, &root->blocks_count);
be667377
RK
57}
58
59void nilfs_inode_sub_blocks(struct inode *inode, int n)
60{
61 struct nilfs_root *root = NILFS_I(inode)->i_root;
62
63 inode_sub_bytes(inode, (1 << inode->i_blkbits) * n);
64 if (root)
e5f7f848 65 atomic64_sub(n, &root->blocks_count);
be667377
RK
66}
67
05fe58fd
RK
68/**
69 * nilfs_get_block() - get a file block on the filesystem (callback function)
70 * @inode - inode struct of the target file
71 * @blkoff - file block number
72 * @bh_result - buffer head to be mapped on
73 * @create - indicate whether allocating the block or not when it has not
74 * been allocated yet.
75 *
76 * This function does not issue actual read request of the specified data
77 * block. It is done by VFS.
05fe58fd
RK
78 */
79int nilfs_get_block(struct inode *inode, sector_t blkoff,
80 struct buffer_head *bh_result, int create)
81{
82 struct nilfs_inode_info *ii = NILFS_I(inode);
0ef28f9a 83 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
c3a7abf0 84 __u64 blknum = 0;
05fe58fd 85 int err = 0, ret;
0c6c44cb 86 unsigned int maxblocks = bh_result->b_size >> inode->i_blkbits;
05fe58fd 87
0ef28f9a 88 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
c3a7abf0 89 ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
0ef28f9a 90 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
c3a7abf0 91 if (ret >= 0) { /* found */
05fe58fd 92 map_bh(bh_result, inode->i_sb, blknum);
c3a7abf0
RK
93 if (ret > 0)
94 bh_result->b_size = (ret << inode->i_blkbits);
05fe58fd
RK
95 goto out;
96 }
05fe58fd
RK
97 /* data block was not found */
98 if (ret == -ENOENT && create) {
99 struct nilfs_transaction_info ti;
100
101 bh_result->b_blocknr = 0;
102 err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
103 if (unlikely(err))
104 goto out;
3568a13f 105 err = nilfs_bmap_insert(ii->i_bmap, blkoff,
05fe58fd 106 (unsigned long)bh_result);
05fe58fd
RK
107 if (unlikely(err != 0)) {
108 if (err == -EEXIST) {
109 /*
110 * The get_block() function could be called
111 * from multiple callers for an inode.
112 * However, the page having this block must
113 * be locked in this case.
114 */
feee880f
RK
115 nilfs_msg(inode->i_sb, KERN_WARNING,
116 "%s (ino=%lu): a race condition while inserting a data block at offset=%llu",
117 __func__, inode->i_ino,
118 (unsigned long long)blkoff);
1f5abe7e 119 err = 0;
05fe58fd 120 }
47420c79 121 nilfs_transaction_abort(inode->i_sb);
05fe58fd
RK
122 goto out;
123 }
b9f66140 124 nilfs_mark_inode_dirty_sync(inode);
47420c79 125 nilfs_transaction_commit(inode->i_sb); /* never fails */
05fe58fd
RK
126 /* Error handling should be detailed */
127 set_buffer_new(bh_result);
27e6c7a3 128 set_buffer_delay(bh_result);
076a378b
RK
129 map_bh(bh_result, inode->i_sb, 0);
130 /* Disk block number must be changed to proper value */
131
05fe58fd 132 } else if (ret == -ENOENT) {
076a378b
RK
133 /*
134 * not found is not error (e.g. hole); must return without
135 * the mapped state flag.
136 */
05fe58fd
RK
137 ;
138 } else {
139 err = ret;
140 }
141
142 out:
143 return err;
144}
145
146/**
147 * nilfs_readpage() - implement readpage() method of nilfs_aops {}
148 * address_space_operations.
149 * @file - file struct of the file to be read
150 * @page - the page to be read
151 */
152static int nilfs_readpage(struct file *file, struct page *page)
153{
154 return mpage_readpage(page, nilfs_get_block);
155}
156
157/**
158 * nilfs_readpages() - implement readpages() method of nilfs_aops {}
159 * address_space_operations.
160 * @file - file struct of the file to be read
161 * @mapping - address_space struct used for reading multiple pages
162 * @pages - the pages to be read
163 * @nr_pages - number of pages to be read
164 */
165static int nilfs_readpages(struct file *file, struct address_space *mapping,
0c6c44cb 166 struct list_head *pages, unsigned int nr_pages)
05fe58fd
RK
167{
168 return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
169}
170
171static int nilfs_writepages(struct address_space *mapping,
172 struct writeback_control *wbc)
173{
f30bf3e4
RK
174 struct inode *inode = mapping->host;
175 int err = 0;
176
8c26c4e2
VD
177 if (inode->i_sb->s_flags & MS_RDONLY) {
178 nilfs_clear_dirty_pages(mapping, false);
179 return -EROFS;
180 }
181
f30bf3e4
RK
182 if (wbc->sync_mode == WB_SYNC_ALL)
183 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
184 wbc->range_start,
185 wbc->range_end);
186 return err;
05fe58fd
RK
187}
188
189static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
190{
191 struct inode *inode = page->mapping->host;
192 int err;
193
eb53b6db 194 if (inode->i_sb->s_flags & MS_RDONLY) {
8c26c4e2
VD
195 /*
196 * It means that filesystem was remounted in read-only
197 * mode because of error or metadata corruption. But we
198 * have dirty pages that try to be flushed in background.
199 * So, here we simply discard this dirty page.
200 */
201 nilfs_clear_dirty_page(page, false);
202 unlock_page(page);
203 return -EROFS;
204 }
205
05fe58fd
RK
206 redirty_page_for_writepage(wbc, page);
207 unlock_page(page);
208
209 if (wbc->sync_mode == WB_SYNC_ALL) {
210 err = nilfs_construct_segment(inode->i_sb);
211 if (unlikely(err))
212 return err;
213 } else if (wbc->for_reclaim)
214 nilfs_flush_segment(inode->i_sb, inode->i_ino);
215
216 return 0;
217}
218
219static int nilfs_set_page_dirty(struct page *page)
220{
56d7acc7 221 struct inode *inode = page->mapping->host;
136e8770 222 int ret = __set_page_dirty_nobuffers(page);
05fe58fd 223
136e8770 224 if (page_has_buffers(page)) {
0c6c44cb 225 unsigned int nr_dirty = 0;
136e8770 226 struct buffer_head *bh, *head;
05fe58fd 227
136e8770
RK
228 /*
229 * This page is locked by callers, and no other thread
230 * concurrently marks its buffers dirty since they are
231 * only dirtied through routines in fs/buffer.c in
232 * which call sites of mark_buffer_dirty are protected
233 * by page lock.
234 */
235 bh = head = page_buffers(page);
236 do {
237 /* Do not mark hole blocks dirty */
238 if (buffer_dirty(bh) || !buffer_mapped(bh))
239 continue;
240
241 set_buffer_dirty(bh);
242 nr_dirty++;
243 } while (bh = bh->b_this_page, bh != head);
244
245 if (nr_dirty)
246 nilfs_set_file_dirty(inode, nr_dirty);
56d7acc7 247 } else if (ret) {
0c6c44cb 248 unsigned int nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
56d7acc7
AR
249
250 nilfs_set_file_dirty(inode, nr_dirty);
05fe58fd
RK
251 }
252 return ret;
253}
254
2d1b399b
MS
255void nilfs_write_failed(struct address_space *mapping, loff_t to)
256{
257 struct inode *inode = mapping->host;
258
259 if (to > inode->i_size) {
7caef267 260 truncate_pagecache(inode, inode->i_size);
2d1b399b
MS
261 nilfs_truncate(inode);
262 }
263}
264
05fe58fd
RK
265static int nilfs_write_begin(struct file *file, struct address_space *mapping,
266 loff_t pos, unsigned len, unsigned flags,
267 struct page **pagep, void **fsdata)
268
269{
270 struct inode *inode = mapping->host;
271 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
272
273 if (unlikely(err))
274 return err;
275
155130a4
CH
276 err = block_write_begin(mapping, pos, len, flags, pagep,
277 nilfs_get_block);
278 if (unlikely(err)) {
2d1b399b 279 nilfs_write_failed(mapping, pos + len);
47420c79 280 nilfs_transaction_abort(inode->i_sb);
155130a4 281 }
05fe58fd
RK
282 return err;
283}
284
285static int nilfs_write_end(struct file *file, struct address_space *mapping,
286 loff_t pos, unsigned len, unsigned copied,
287 struct page *page, void *fsdata)
288{
289 struct inode *inode = mapping->host;
0c6c44cb
RK
290 unsigned int start = pos & (PAGE_SIZE - 1);
291 unsigned int nr_dirty;
05fe58fd
RK
292 int err;
293
294 nr_dirty = nilfs_page_count_clean_buffers(page, start,
295 start + copied);
296 copied = generic_write_end(file, mapping, pos, len, copied, page,
297 fsdata);
bcbc8c64 298 nilfs_set_file_dirty(inode, nr_dirty);
47420c79 299 err = nilfs_transaction_commit(inode->i_sb);
05fe58fd
RK
300 return err ? : copied;
301}
302
303static ssize_t
c8b8e32d 304nilfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
05fe58fd 305{
6b6dabc8 306 struct inode *inode = file_inode(iocb->ki_filp);
05fe58fd 307
6f673763 308 if (iov_iter_rw(iter) == WRITE)
05fe58fd
RK
309 return 0;
310
311 /* Needs synchronization with the cleaner */
c8b8e32d 312 return blockdev_direct_IO(iocb, inode, iter, nilfs_get_block);
05fe58fd
RK
313}
314
7f09410b 315const struct address_space_operations nilfs_aops = {
05fe58fd
RK
316 .writepage = nilfs_writepage,
317 .readpage = nilfs_readpage,
05fe58fd
RK
318 .writepages = nilfs_writepages,
319 .set_page_dirty = nilfs_set_page_dirty,
320 .readpages = nilfs_readpages,
321 .write_begin = nilfs_write_begin,
322 .write_end = nilfs_write_end,
323 /* .releasepage = nilfs_releasepage, */
324 .invalidatepage = block_invalidatepage,
325 .direct_IO = nilfs_direct_IO,
258ef67e 326 .is_partially_uptodate = block_is_partially_uptodate,
05fe58fd
RK
327};
328
705304a8
RK
329static int nilfs_insert_inode_locked(struct inode *inode,
330 struct nilfs_root *root,
331 unsigned long ino)
332{
333 struct nilfs_iget_args args = {
334 .ino = ino, .root = root, .cno = 0, .for_gc = 0
335 };
336
337 return insert_inode_locked4(inode, ino, nilfs_iget_test, &args);
338}
339
c6e49e3f 340struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
05fe58fd
RK
341{
342 struct super_block *sb = dir->i_sb;
e3154e97 343 struct the_nilfs *nilfs = sb->s_fs_info;
05fe58fd
RK
344 struct inode *inode;
345 struct nilfs_inode_info *ii;
4d8d9293 346 struct nilfs_root *root;
05fe58fd
RK
347 int err = -ENOMEM;
348 ino_t ino;
349
350 inode = new_inode(sb);
351 if (unlikely(!inode))
352 goto failed;
353
354 mapping_set_gfp_mask(inode->i_mapping,
c62d2555 355 mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
05fe58fd 356
4d8d9293 357 root = NILFS_I(dir)->i_root;
05fe58fd 358 ii = NILFS_I(inode);
4ce5c342 359 ii->i_state = BIT(NILFS_I_NEW);
4d8d9293 360 ii->i_root = root;
05fe58fd 361
e912a5b6 362 err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
05fe58fd
RK
363 if (unlikely(err))
364 goto failed_ifile_create_inode;
365 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
366
e5f7f848 367 atomic64_inc(&root->inodes_count);
73459dcc 368 inode_init_owner(inode, dir, mode);
05fe58fd 369 inode->i_ino = ino;
078cd827 370 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
05fe58fd
RK
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)
705304a8 375 goto failed_after_creation;
05fe58fd
RK
376
377 set_bit(NILFS_I_BMAP, &ii->i_state);
378 /* No lock is needed; iget() ensures it. */
379 }
380
b253a3e4
RK
381 ii->i_flags = nilfs_mask_flags(
382 mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED);
05fe58fd
RK
383
384 /* ii->i_file_acl = 0; */
385 /* ii->i_dir_acl = 0; */
05fe58fd 386 ii->i_dir_start_lookup = 0;
05fe58fd 387 nilfs_set_inode_flags(inode);
9b1fc4e4
RK
388 spin_lock(&nilfs->ns_next_gen_lock);
389 inode->i_generation = nilfs->ns_next_generation++;
390 spin_unlock(&nilfs->ns_next_gen_lock);
705304a8
RK
391 if (nilfs_insert_inode_locked(inode, root, ino) < 0) {
392 err = -EIO;
393 goto failed_after_creation;
394 }
05fe58fd
RK
395
396 err = nilfs_init_acl(inode, dir);
397 if (unlikely(err))
076a378b
RK
398 /*
399 * Never occur. When supporting nilfs_init_acl(),
400 * proper cancellation of above jobs should be considered.
401 */
402 goto failed_after_creation;
05fe58fd 403
05fe58fd
RK
404 return inode;
405
705304a8 406 failed_after_creation:
6d6b77f1 407 clear_nlink(inode);
705304a8 408 unlock_new_inode(inode);
076a378b
RK
409 iput(inode); /*
410 * raw_inode will be deleted through
411 * nilfs_evict_inode().
412 */
05fe58fd
RK
413 goto failed;
414
415 failed_ifile_create_inode:
416 make_bad_inode(inode);
076a378b 417 iput(inode);
05fe58fd
RK
418 failed:
419 return ERR_PTR(err);
420}
421
05fe58fd
RK
422void nilfs_set_inode_flags(struct inode *inode)
423{
424 unsigned int flags = NILFS_I(inode)->i_flags;
faea2c53 425 unsigned int new_fl = 0;
05fe58fd 426
f0c9f242 427 if (flags & FS_SYNC_FL)
faea2c53 428 new_fl |= S_SYNC;
f0c9f242 429 if (flags & FS_APPEND_FL)
faea2c53 430 new_fl |= S_APPEND;
f0c9f242 431 if (flags & FS_IMMUTABLE_FL)
faea2c53 432 new_fl |= S_IMMUTABLE;
f0c9f242 433 if (flags & FS_NOATIME_FL)
faea2c53 434 new_fl |= S_NOATIME;
f0c9f242 435 if (flags & FS_DIRSYNC_FL)
faea2c53
RK
436 new_fl |= S_DIRSYNC;
437 inode_set_flags(inode, new_fl, S_SYNC | S_APPEND | S_IMMUTABLE |
438 S_NOATIME | S_DIRSYNC);
05fe58fd
RK
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);
305d3d0d
EB
448 i_uid_write(inode, le32_to_cpu(raw_inode->i_uid));
449 i_gid_write(inode, le32_to_cpu(raw_inode->i_gid));
bfe86848 450 set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
05fe58fd
RK
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);
61239230
RK
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);
705304a8
RK
458 if (inode->i_nlink == 0)
459 return -ESTALE; /* this inode is deleted */
05fe58fd
RK
460
461 inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
462 ii->i_flags = le32_to_cpu(raw_inode->i_flags);
463#if 0
464 ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
465 ii->i_dir_acl = S_ISREG(inode->i_mode) ?
466 0 : le32_to_cpu(raw_inode->i_dir_acl);
467#endif
3cc811bf 468 ii->i_dir_start_lookup = 0;
05fe58fd
RK
469 inode->i_generation = le32_to_cpu(raw_inode->i_generation);
470
471 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
472 S_ISLNK(inode->i_mode)) {
473 err = nilfs_bmap_read(ii->i_bmap, raw_inode);
474 if (err < 0)
475 return err;
476 set_bit(NILFS_I_BMAP, &ii->i_state);
477 /* No lock is needed; iget() ensures it. */
478 }
479 return 0;
480}
481
e912a5b6
RK
482static int __nilfs_read_inode(struct super_block *sb,
483 struct nilfs_root *root, unsigned long ino,
05fe58fd
RK
484 struct inode *inode)
485{
e3154e97 486 struct the_nilfs *nilfs = sb->s_fs_info;
05fe58fd
RK
487 struct buffer_head *bh;
488 struct nilfs_inode *raw_inode;
489 int err;
490
365e215c 491 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
e912a5b6 492 err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
05fe58fd
RK
493 if (unlikely(err))
494 goto bad_inode;
495
e912a5b6 496 raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
05fe58fd 497
1b2f5a64
RK
498 err = nilfs_read_inode_common(inode, raw_inode);
499 if (err)
05fe58fd
RK
500 goto failed_unmap;
501
502 if (S_ISREG(inode->i_mode)) {
503 inode->i_op = &nilfs_file_inode_operations;
504 inode->i_fop = &nilfs_file_operations;
505 inode->i_mapping->a_ops = &nilfs_aops;
05fe58fd
RK
506 } else if (S_ISDIR(inode->i_mode)) {
507 inode->i_op = &nilfs_dir_inode_operations;
508 inode->i_fop = &nilfs_dir_operations;
509 inode->i_mapping->a_ops = &nilfs_aops;
510 } else if (S_ISLNK(inode->i_mode)) {
511 inode->i_op = &nilfs_symlink_inode_operations;
21fc61c7 512 inode_nohighmem(inode);
05fe58fd
RK
513 inode->i_mapping->a_ops = &nilfs_aops;
514 } else {
515 inode->i_op = &nilfs_special_inode_operations;
516 init_special_inode(
517 inode, inode->i_mode,
cdce214e 518 huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
05fe58fd 519 }
e912a5b6 520 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
05fe58fd 521 brelse(bh);
365e215c 522 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
05fe58fd 523 nilfs_set_inode_flags(inode);
0ce187c4 524 mapping_set_gfp_mask(inode->i_mapping,
c62d2555 525 mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
05fe58fd
RK
526 return 0;
527
528 failed_unmap:
e912a5b6 529 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
05fe58fd
RK
530 brelse(bh);
531
532 bad_inode:
365e215c 533 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
05fe58fd
RK
534 return err;
535}
536
0e14a359
RK
537static int nilfs_iget_test(struct inode *inode, void *opaque)
538{
539 struct nilfs_iget_args *args = opaque;
540 struct nilfs_inode_info *ii;
541
4d8d9293 542 if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
0e14a359
RK
543 return 0;
544
545 ii = NILFS_I(inode);
546 if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
547 return !args->for_gc;
548
549 return args->for_gc && args->cno == ii->i_cno;
550}
551
552static int nilfs_iget_set(struct inode *inode, void *opaque)
553{
554 struct nilfs_iget_args *args = opaque;
555
556 inode->i_ino = args->ino;
557 if (args->for_gc) {
4ce5c342 558 NILFS_I(inode)->i_state = BIT(NILFS_I_GCINODE);
0e14a359 559 NILFS_I(inode)->i_cno = args->cno;
4d8d9293
RK
560 NILFS_I(inode)->i_root = NULL;
561 } else {
562 if (args->root && args->ino == NILFS_ROOT_INO)
563 nilfs_get_root(args->root);
564 NILFS_I(inode)->i_root = args->root;
0e14a359
RK
565 }
566 return 0;
567}
568
032dbb3b
RK
569struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
570 unsigned long ino)
571{
572 struct nilfs_iget_args args = {
573 .ino = ino, .root = root, .cno = 0, .for_gc = 0
574 };
575
576 return ilookup5(sb, ino, nilfs_iget_test, &args);
577}
578
f1e89c86
RK
579struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
580 unsigned long ino)
05fe58fd 581{
4d8d9293
RK
582 struct nilfs_iget_args args = {
583 .ino = ino, .root = root, .cno = 0, .for_gc = 0
584 };
f1e89c86
RK
585
586 return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
587}
588
589struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
590 unsigned long ino)
591{
05fe58fd
RK
592 struct inode *inode;
593 int err;
594
f1e89c86 595 inode = nilfs_iget_locked(sb, root, ino);
05fe58fd
RK
596 if (unlikely(!inode))
597 return ERR_PTR(-ENOMEM);
598 if (!(inode->i_state & I_NEW))
599 return inode;
600
e912a5b6 601 err = __nilfs_read_inode(sb, root, ino, inode);
05fe58fd
RK
602 if (unlikely(err)) {
603 iget_failed(inode);
604 return ERR_PTR(err);
605 }
606 unlock_new_inode(inode);
607 return inode;
608}
609
263d90ce
RK
610struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
611 __u64 cno)
612{
4d8d9293
RK
613 struct nilfs_iget_args args = {
614 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
615 };
263d90ce
RK
616 struct inode *inode;
617 int err;
618
619 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
620 if (unlikely(!inode))
621 return ERR_PTR(-ENOMEM);
622 if (!(inode->i_state & I_NEW))
623 return inode;
624
625 err = nilfs_init_gcinode(inode);
626 if (unlikely(err)) {
627 iget_failed(inode);
628 return ERR_PTR(err);
629 }
630 unlock_new_inode(inode);
631 return inode;
632}
633
05fe58fd
RK
634void nilfs_write_inode_common(struct inode *inode,
635 struct nilfs_inode *raw_inode, int has_bmap)
636{
637 struct nilfs_inode_info *ii = NILFS_I(inode);
638
639 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
305d3d0d
EB
640 raw_inode->i_uid = cpu_to_le32(i_uid_read(inode));
641 raw_inode->i_gid = cpu_to_le32(i_gid_read(inode));
05fe58fd
RK
642 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
643 raw_inode->i_size = cpu_to_le64(inode->i_size);
644 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
645 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
61239230
RK
646 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
647 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
05fe58fd
RK
648 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
649
05fe58fd
RK
650 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
651 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
652
56eb5538
RK
653 if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) {
654 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
655
656 /* zero-fill unused portion in the case of super root block */
657 raw_inode->i_xattr = 0;
658 raw_inode->i_pad = 0;
659 memset((void *)raw_inode + sizeof(*raw_inode), 0,
660 nilfs->ns_inode_size - sizeof(*raw_inode));
661 }
662
05fe58fd
RK
663 if (has_bmap)
664 nilfs_bmap_write(ii->i_bmap, raw_inode);
665 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
666 raw_inode->i_device_code =
cdce214e 667 cpu_to_le64(huge_encode_dev(inode->i_rdev));
076a378b
RK
668 /*
669 * When extending inode, nilfs->ns_inode_size should be checked
670 * for substitutions of appended fields.
671 */
05fe58fd
RK
672}
673
b9f66140 674void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh, int flags)
05fe58fd
RK
675{
676 ino_t ino = inode->i_ino;
677 struct nilfs_inode_info *ii = NILFS_I(inode);
e912a5b6 678 struct inode *ifile = ii->i_root->ifile;
05fe58fd
RK
679 struct nilfs_inode *raw_inode;
680
e912a5b6 681 raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
05fe58fd 682
05fe58fd 683 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
e912a5b6 684 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
b9f66140
AR
685 if (flags & I_DIRTY_DATASYNC)
686 set_bit(NILFS_I_INODE_SYNC, &ii->i_state);
05fe58fd
RK
687
688 nilfs_write_inode_common(inode, raw_inode, 0);
076a378b
RK
689 /*
690 * XXX: call with has_bmap = 0 is a workaround to avoid
691 * deadlock of bmap. This delays update of i_bmap to just
692 * before writing.
693 */
694
e912a5b6 695 nilfs_ifile_unmap_inode(ifile, ino, ibh);
05fe58fd
RK
696}
697
698#define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
699
700static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
701 unsigned long from)
702{
3568a13f 703 __u64 b;
05fe58fd
RK
704 int ret;
705
706 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
707 return;
e828949e 708repeat:
05fe58fd
RK
709 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
710 if (ret == -ENOENT)
711 return;
712 else if (ret < 0)
713 goto failed;
714
715 if (b < from)
716 return;
717
3568a13f 718 b -= min_t(__u64, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
05fe58fd
RK
719 ret = nilfs_bmap_truncate(ii->i_bmap, b);
720 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
721 if (!ret || (ret == -ENOMEM &&
722 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
723 goto repeat;
724
e828949e 725failed:
d6517deb
RK
726 nilfs_msg(ii->vfs_inode.i_sb, KERN_WARNING,
727 "error %d truncating bmap (ino=%lu)", ret,
728 ii->vfs_inode.i_ino);
05fe58fd
RK
729}
730
731void nilfs_truncate(struct inode *inode)
732{
733 unsigned long blkoff;
734 unsigned int blocksize;
735 struct nilfs_transaction_info ti;
736 struct super_block *sb = inode->i_sb;
737 struct nilfs_inode_info *ii = NILFS_I(inode);
05fe58fd
RK
738
739 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
740 return;
741 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
742 return;
743
744 blocksize = sb->s_blocksize;
745 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
1f5abe7e 746 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
05fe58fd
RK
747
748 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
749
750 nilfs_truncate_bmap(ii, blkoff);
751
078cd827 752 inode->i_mtime = inode->i_ctime = current_time(inode);
05fe58fd
RK
753 if (IS_SYNC(inode))
754 nilfs_set_transaction_flag(NILFS_TI_SYNC);
755
abdb318b 756 nilfs_mark_inode_dirty(inode);
bcbc8c64 757 nilfs_set_file_dirty(inode, 0);
47420c79 758 nilfs_transaction_commit(sb);
076a378b
RK
759 /*
760 * May construct a logical segment and may fail in sync mode.
761 * But truncate has no return value.
762 */
05fe58fd
RK
763}
764
6fd1e5c9
AV
765static void nilfs_clear_inode(struct inode *inode)
766{
767 struct nilfs_inode_info *ii = NILFS_I(inode);
768
769 /*
770 * Free resources allocated in nilfs_read_inode(), here.
771 */
772 BUG_ON(!list_empty(&ii->i_dirty));
773 brelse(ii->i_bh);
774 ii->i_bh = NULL;
775
2d19961d
RK
776 if (nilfs_is_metadata_file_inode(inode))
777 nilfs_mdt_clear(inode);
518d1a6a 778
6fd1e5c9
AV
779 if (test_bit(NILFS_I_BMAP, &ii->i_state))
780 nilfs_bmap_clear(ii->i_bmap);
781
782 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
4d8d9293
RK
783
784 if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
785 nilfs_put_root(ii->i_root);
6fd1e5c9
AV
786}
787
788void nilfs_evict_inode(struct inode *inode)
05fe58fd
RK
789{
790 struct nilfs_transaction_info ti;
791 struct super_block *sb = inode->i_sb;
792 struct nilfs_inode_info *ii = NILFS_I(inode);
25b18d39 793 int ret;
05fe58fd 794
4d8d9293 795 if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
91b0abe3 796 truncate_inode_pages_final(&inode->i_data);
dbd5768f 797 clear_inode(inode);
6fd1e5c9 798 nilfs_clear_inode(inode);
05fe58fd
RK
799 return;
800 }
1f5abe7e
RK
801 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
802
91b0abe3 803 truncate_inode_pages_final(&inode->i_data);
05fe58fd 804
e912a5b6 805 /* TODO: some of the following operations may fail. */
05fe58fd 806 nilfs_truncate_bmap(ii, 0);
abdb318b 807 nilfs_mark_inode_dirty(inode);
dbd5768f 808 clear_inode(inode);
e912a5b6 809
25b18d39
RK
810 ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
811 if (!ret)
e5f7f848 812 atomic64_dec(&ii->i_root->inodes_count);
e912a5b6 813
6fd1e5c9 814 nilfs_clear_inode(inode);
e912a5b6 815
05fe58fd
RK
816 if (IS_SYNC(inode))
817 nilfs_set_transaction_flag(NILFS_TI_SYNC);
47420c79 818 nilfs_transaction_commit(sb);
076a378b
RK
819 /*
820 * May construct a logical segment and may fail in sync mode.
821 * But delete_inode has no return value.
822 */
05fe58fd
RK
823}
824
825int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
826{
827 struct nilfs_transaction_info ti;
2b0143b5 828 struct inode *inode = d_inode(dentry);
05fe58fd 829 struct super_block *sb = inode->i_sb;
47420c79 830 int err;
05fe58fd 831
31051c85 832 err = setattr_prepare(dentry, iattr);
05fe58fd
RK
833 if (err)
834 return err;
835
836 err = nilfs_transaction_begin(sb, &ti, 0);
837 if (unlikely(err))
838 return err;
1025774c
CH
839
840 if ((iattr->ia_valid & ATTR_SIZE) &&
841 iattr->ia_size != i_size_read(inode)) {
562c72aa 842 inode_dio_wait(inode);
2d1b399b
MS
843 truncate_setsize(inode, iattr->ia_size);
844 nilfs_truncate(inode);
1025774c
CH
845 }
846
847 setattr_copy(inode, iattr);
848 mark_inode_dirty(inode);
849
850 if (iattr->ia_valid & ATTR_MODE) {
05fe58fd 851 err = nilfs_acl_chmod(inode);
1025774c
CH
852 if (unlikely(err))
853 goto out_err;
854 }
855
856 return nilfs_transaction_commit(sb);
47420c79 857
1025774c
CH
858out_err:
859 nilfs_transaction_abort(sb);
47420c79 860 return err;
05fe58fd
RK
861}
862
10556cb2 863int nilfs_permission(struct inode *inode, int mask)
dc3d3b81 864{
730e908f 865 struct nilfs_root *root = NILFS_I(inode)->i_root;
4ad364ca 866
dc3d3b81
RK
867 if ((mask & MAY_WRITE) && root &&
868 root->cno != NILFS_CPTREE_CURRENT_CNO)
869 return -EROFS; /* snapshot is not writable */
870
2830ba7f 871 return generic_permission(inode, mask);
dc3d3b81
RK
872}
873
bcbc8c64 874int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
05fe58fd 875{
e3154e97 876 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
05fe58fd
RK
877 struct nilfs_inode_info *ii = NILFS_I(inode);
878 int err;
879
693dd321 880 spin_lock(&nilfs->ns_inode_lock);
05fe58fd 881 if (ii->i_bh == NULL) {
693dd321 882 spin_unlock(&nilfs->ns_inode_lock);
e912a5b6
RK
883 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
884 inode->i_ino, pbh);
05fe58fd
RK
885 if (unlikely(err))
886 return err;
693dd321 887 spin_lock(&nilfs->ns_inode_lock);
05fe58fd
RK
888 if (ii->i_bh == NULL)
889 ii->i_bh = *pbh;
890 else {
891 brelse(*pbh);
892 *pbh = ii->i_bh;
893 }
894 } else
895 *pbh = ii->i_bh;
896
897 get_bh(*pbh);
693dd321 898 spin_unlock(&nilfs->ns_inode_lock);
05fe58fd
RK
899 return 0;
900}
901
902int nilfs_inode_dirty(struct inode *inode)
903{
904 struct nilfs_inode_info *ii = NILFS_I(inode);
e3154e97 905 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
05fe58fd
RK
906 int ret = 0;
907
908 if (!list_empty(&ii->i_dirty)) {
693dd321 909 spin_lock(&nilfs->ns_inode_lock);
05fe58fd
RK
910 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
911 test_bit(NILFS_I_BUSY, &ii->i_state);
693dd321 912 spin_unlock(&nilfs->ns_inode_lock);
05fe58fd
RK
913 }
914 return ret;
915}
916
0c6c44cb 917int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty)
05fe58fd
RK
918{
919 struct nilfs_inode_info *ii = NILFS_I(inode);
e3154e97 920 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
05fe58fd 921
693dd321 922 atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
05fe58fd 923
458c5b08 924 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
05fe58fd
RK
925 return 0;
926
693dd321 927 spin_lock(&nilfs->ns_inode_lock);
05fe58fd
RK
928 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
929 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
076a378b
RK
930 /*
931 * Because this routine may race with nilfs_dispose_list(),
932 * we have to check NILFS_I_QUEUED here, too.
933 */
05fe58fd 934 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
076a378b
RK
935 /*
936 * This will happen when somebody is freeing
937 * this inode.
938 */
d6517deb
RK
939 nilfs_msg(inode->i_sb, KERN_WARNING,
940 "cannot set file dirty (ino=%lu): the file is being freed",
941 inode->i_ino);
693dd321 942 spin_unlock(&nilfs->ns_inode_lock);
076a378b
RK
943 return -EINVAL; /*
944 * NILFS_I_DIRTY may remain for
945 * freeing inode.
946 */
05fe58fd 947 }
eaae0f37 948 list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
05fe58fd
RK
949 set_bit(NILFS_I_QUEUED, &ii->i_state);
950 }
693dd321 951 spin_unlock(&nilfs->ns_inode_lock);
05fe58fd
RK
952 return 0;
953}
954
b9f66140 955int __nilfs_mark_inode_dirty(struct inode *inode, int flags)
05fe58fd 956{
05fe58fd
RK
957 struct buffer_head *ibh;
958 int err;
959
bcbc8c64 960 err = nilfs_load_inode_block(inode, &ibh);
05fe58fd 961 if (unlikely(err)) {
d6517deb
RK
962 nilfs_msg(inode->i_sb, KERN_WARNING,
963 "cannot mark inode dirty (ino=%lu): error %d loading inode block",
964 inode->i_ino, err);
05fe58fd
RK
965 return err;
966 }
b9f66140 967 nilfs_update_inode(inode, ibh, flags);
5fc7b141 968 mark_buffer_dirty(ibh);
e912a5b6 969 nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
05fe58fd
RK
970 brelse(ibh);
971 return 0;
972}
973
974/**
975 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
976 * @inode: inode of the file to be registered.
977 *
978 * nilfs_dirty_inode() loads a inode block containing the specified
979 * @inode and copies data from a nilfs_inode to a corresponding inode
980 * entry in the inode block. This operation is excluded from the segment
981 * construction. This function can be called both as a single operation
982 * and as a part of indivisible file operations.
983 */
aa385729 984void nilfs_dirty_inode(struct inode *inode, int flags)
05fe58fd
RK
985{
986 struct nilfs_transaction_info ti;
7d6cd92f 987 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
05fe58fd
RK
988
989 if (is_bad_inode(inode)) {
d6517deb
RK
990 nilfs_msg(inode->i_sb, KERN_WARNING,
991 "tried to mark bad_inode dirty. ignored.");
05fe58fd
RK
992 dump_stack();
993 return;
994 }
7d6cd92f
RK
995 if (mdi) {
996 nilfs_mdt_mark_dirty(inode);
997 return;
998 }
05fe58fd 999 nilfs_transaction_begin(inode->i_sb, &ti, 0);
b9f66140 1000 __nilfs_mark_inode_dirty(inode, flags);
47420c79 1001 nilfs_transaction_commit(inode->i_sb); /* never fails */
05fe58fd 1002}
622daaff
RK
1003
1004int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1005 __u64 start, __u64 len)
1006{
0ef28f9a 1007 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
622daaff
RK
1008 __u64 logical = 0, phys = 0, size = 0;
1009 __u32 flags = 0;
1010 loff_t isize;
1011 sector_t blkoff, end_blkoff;
1012 sector_t delalloc_blkoff;
1013 unsigned long delalloc_blklen;
1014 unsigned int blkbits = inode->i_blkbits;
1015 int ret, n;
1016
1017 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1018 if (ret)
1019 return ret;
1020
5955102c 1021 inode_lock(inode);
622daaff
RK
1022
1023 isize = i_size_read(inode);
1024
1025 blkoff = start >> blkbits;
1026 end_blkoff = (start + len - 1) >> blkbits;
1027
1028 delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
1029 &delalloc_blkoff);
1030
1031 do {
1032 __u64 blkphy;
1033 unsigned int maxblocks;
1034
1035 if (delalloc_blklen && blkoff == delalloc_blkoff) {
1036 if (size) {
1037 /* End of the current extent */
1038 ret = fiemap_fill_next_extent(
1039 fieinfo, logical, phys, size, flags);
1040 if (ret)
1041 break;
1042 }
1043 if (blkoff > end_blkoff)
1044 break;
1045
1046 flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
1047 logical = blkoff << blkbits;
1048 phys = 0;
1049 size = delalloc_blklen << blkbits;
1050
1051 blkoff = delalloc_blkoff + delalloc_blklen;
1052 delalloc_blklen = nilfs_find_uncommitted_extent(
1053 inode, blkoff, &delalloc_blkoff);
1054 continue;
1055 }
1056
1057 /*
1058 * Limit the number of blocks that we look up so as
1059 * not to get into the next delayed allocation extent.
1060 */
1061 maxblocks = INT_MAX;
1062 if (delalloc_blklen)
1063 maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
1064 maxblocks);
1065 blkphy = 0;
1066
1067 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1068 n = nilfs_bmap_lookup_contig(
1069 NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
1070 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1071
1072 if (n < 0) {
1073 int past_eof;
1074
1075 if (unlikely(n != -ENOENT))
1076 break; /* error */
1077
1078 /* HOLE */
1079 blkoff++;
1080 past_eof = ((blkoff << blkbits) >= isize);
1081
1082 if (size) {
1083 /* End of the current extent */
1084
1085 if (past_eof)
1086 flags |= FIEMAP_EXTENT_LAST;
1087
1088 ret = fiemap_fill_next_extent(
1089 fieinfo, logical, phys, size, flags);
1090 if (ret)
1091 break;
1092 size = 0;
1093 }
1094 if (blkoff > end_blkoff || past_eof)
1095 break;
1096 } else {
1097 if (size) {
1098 if (phys && blkphy << blkbits == phys + size) {
1099 /* The current extent goes on */
1100 size += n << blkbits;
1101 } else {
1102 /* Terminate the current extent */
1103 ret = fiemap_fill_next_extent(
1104 fieinfo, logical, phys, size,
1105 flags);
1106 if (ret || blkoff > end_blkoff)
1107 break;
1108
1109 /* Start another extent */
1110 flags = FIEMAP_EXTENT_MERGED;
1111 logical = blkoff << blkbits;
1112 phys = blkphy << blkbits;
1113 size = n << blkbits;
1114 }
1115 } else {
1116 /* Start a new extent */
1117 flags = FIEMAP_EXTENT_MERGED;
1118 logical = blkoff << blkbits;
1119 phys = blkphy << blkbits;
1120 size = n << blkbits;
1121 }
1122 blkoff += n;
1123 }
1124 cond_resched();
1125 } while (true);
1126
1127 /* If ret is 1 then we just hit the end of the extent array */
1128 if (ret == 1)
1129 ret = 0;
1130
5955102c 1131 inode_unlock(inode);
622daaff
RK
1132 return ret;
1133}