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iio: temperature: add support for Maxim thermocouple chips
[linux/fpc-iii.git] / fs / nilfs2 / inode.c
bloba0ebdb17e9124c25520033b1f4137e6bcb3ddaaa
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 *
16 * Written by Ryusuke Konishi.
17 *
18 */
19
20 #include <linux/buffer_head.h>
21 #include <linux/gfp.h>
22 #include <linux/mpage.h>
23 #include <linux/pagemap.h>
24 #include <linux/writeback.h>
25 #include <linux/uio.h>
26 #include "nilfs.h"
27 #include "btnode.h"
28 #include "segment.h"
29 #include "page.h"
30 #include "mdt.h"
31 #include "cpfile.h"
32 #include "ifile.h"
33
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 */
41 struct nilfs_iget_args {
42 u64 ino;
43 __u64 cno;
44 struct nilfs_root *root;
45 int for_gc;
46 };
47
48 static int nilfs_iget_test(struct inode *inode, void *opaque);
49
50 void 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)
56 atomic64_add(n, &root->blocks_count);
57 }
58
59 void 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)
65 atomic64_sub(n, &root->blocks_count);
66 }
67
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.
78 */
79 int 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);
83 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
84 __u64 blknum = 0;
85 int err = 0, ret;
86 unsigned int maxblocks = bh_result->b_size >> inode->i_blkbits;
87
88 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
89 ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
90 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
91 if (ret >= 0) { /* found */
92 map_bh(bh_result, inode->i_sb, blknum);
93 if (ret > 0)
94 bh_result->b_size = (ret << inode->i_blkbits);
95 goto out;
96 }
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;
105 err = nilfs_bmap_insert(ii->i_bmap, blkoff,
106 (unsigned long)bh_result);
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 */
115 printk(KERN_WARNING
116 "nilfs_get_block: a race condition "
117 "while inserting a data block. "
118 "(inode number=%lu, file block "
119 "offset=%llu)\n",
120 inode->i_ino,
121 (unsigned long long)blkoff);
122 err = 0;
123 }
124 nilfs_transaction_abort(inode->i_sb);
125 goto out;
126 }
127 nilfs_mark_inode_dirty_sync(inode);
128 nilfs_transaction_commit(inode->i_sb); /* never fails */
129 /* Error handling should be detailed */
130 set_buffer_new(bh_result);
131 set_buffer_delay(bh_result);
132 map_bh(bh_result, inode->i_sb, 0);
133 /* Disk block number must be changed to proper value */
134
135 } else if (ret == -ENOENT) {
136 /*
137 * not found is not error (e.g. hole); must return without
138 * the mapped state flag.
139 */
140 ;
141 } else {
142 err = ret;
143 }
144
145 out:
146 return err;
147 }
148
149 /**
150 * nilfs_readpage() - implement readpage() method of nilfs_aops {}
151 * address_space_operations.
152 * @file - file struct of the file to be read
153 * @page - the page to be read
154 */
155 static int nilfs_readpage(struct file *file, struct page *page)
156 {
157 return mpage_readpage(page, nilfs_get_block);
158 }
159
160 /**
161 * nilfs_readpages() - implement readpages() method of nilfs_aops {}
162 * address_space_operations.
163 * @file - file struct of the file to be read
164 * @mapping - address_space struct used for reading multiple pages
165 * @pages - the pages to be read
166 * @nr_pages - number of pages to be read
167 */
168 static int nilfs_readpages(struct file *file, struct address_space *mapping,
169 struct list_head *pages, unsigned int nr_pages)
170 {
171 return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
172 }
173
174 static int nilfs_writepages(struct address_space *mapping,
175 struct writeback_control *wbc)
176 {
177 struct inode *inode = mapping->host;
178 int err = 0;
179
180 if (inode->i_sb->s_flags & MS_RDONLY) {
181 nilfs_clear_dirty_pages(mapping, false);
182 return -EROFS;
183 }
184
185 if (wbc->sync_mode == WB_SYNC_ALL)
186 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
187 wbc->range_start,
188 wbc->range_end);
189 return err;
190 }
191
192 static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
193 {
194 struct inode *inode = page->mapping->host;
195 int err;
196
197 if (inode->i_sb->s_flags & MS_RDONLY) {
198 /*
199 * It means that filesystem was remounted in read-only
200 * mode because of error or metadata corruption. But we
201 * have dirty pages that try to be flushed in background.
202 * So, here we simply discard this dirty page.
203 */
204 nilfs_clear_dirty_page(page, false);
205 unlock_page(page);
206 return -EROFS;
207 }
208
209 redirty_page_for_writepage(wbc, page);
210 unlock_page(page);
211
212 if (wbc->sync_mode == WB_SYNC_ALL) {
213 err = nilfs_construct_segment(inode->i_sb);
214 if (unlikely(err))
215 return err;
216 } else if (wbc->for_reclaim)
217 nilfs_flush_segment(inode->i_sb, inode->i_ino);
218
219 return 0;
220 }
221
222 static int nilfs_set_page_dirty(struct page *page)
223 {
224 struct inode *inode = page->mapping->host;
225 int ret = __set_page_dirty_nobuffers(page);
226
227 if (page_has_buffers(page)) {
228 unsigned int nr_dirty = 0;
229 struct buffer_head *bh, *head;
230
231 /*
232 * This page is locked by callers, and no other thread
233 * concurrently marks its buffers dirty since they are
234 * only dirtied through routines in fs/buffer.c in
235 * which call sites of mark_buffer_dirty are protected
236 * by page lock.
237 */
238 bh = head = page_buffers(page);
239 do {
240 /* Do not mark hole blocks dirty */
241 if (buffer_dirty(bh) || !buffer_mapped(bh))
242 continue;
243
244 set_buffer_dirty(bh);
245 nr_dirty++;
246 } while (bh = bh->b_this_page, bh != head);
247
248 if (nr_dirty)
249 nilfs_set_file_dirty(inode, nr_dirty);
250 } else if (ret) {
251 unsigned int nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
252
253 nilfs_set_file_dirty(inode, nr_dirty);
254 }
255 return ret;
256 }
257
258 void nilfs_write_failed(struct address_space *mapping, loff_t to)
259 {
260 struct inode *inode = mapping->host;
261
262 if (to > inode->i_size) {
263 truncate_pagecache(inode, inode->i_size);
264 nilfs_truncate(inode);
265 }
266 }
267
268 static int nilfs_write_begin(struct file *file, struct address_space *mapping,
269 loff_t pos, unsigned len, unsigned flags,
270 struct page **pagep, void **fsdata)
271
272 {
273 struct inode *inode = mapping->host;
274 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
275
276 if (unlikely(err))
277 return err;
278
279 err = block_write_begin(mapping, pos, len, flags, pagep,
280 nilfs_get_block);
281 if (unlikely(err)) {
282 nilfs_write_failed(mapping, pos + len);
283 nilfs_transaction_abort(inode->i_sb);
284 }
285 return err;
286 }
287
288 static int nilfs_write_end(struct file *file, struct address_space *mapping,
289 loff_t pos, unsigned len, unsigned copied,
290 struct page *page, void *fsdata)
291 {
292 struct inode *inode = mapping->host;
293 unsigned int start = pos & (PAGE_SIZE - 1);
294 unsigned int nr_dirty;
295 int err;
296
297 nr_dirty = nilfs_page_count_clean_buffers(page, start,
298 start + copied);
299 copied = generic_write_end(file, mapping, pos, len, copied, page,
300 fsdata);
301 nilfs_set_file_dirty(inode, nr_dirty);
302 err = nilfs_transaction_commit(inode->i_sb);
303 return err ? : copied;
304 }
305
306 static ssize_t
307 nilfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
308 {
309 struct inode *inode = file_inode(iocb->ki_filp);
310
311 if (iov_iter_rw(iter) == WRITE)
312 return 0;
313
314 /* Needs synchronization with the cleaner */
315 return blockdev_direct_IO(iocb, inode, iter, nilfs_get_block);
316 }
317
318 const struct address_space_operations nilfs_aops = {
319 .writepage = nilfs_writepage,
320 .readpage = nilfs_readpage,
321 .writepages = nilfs_writepages,
322 .set_page_dirty = nilfs_set_page_dirty,
323 .readpages = nilfs_readpages,
324 .write_begin = nilfs_write_begin,
325 .write_end = nilfs_write_end,
326 /* .releasepage = nilfs_releasepage, */
327 .invalidatepage = block_invalidatepage,
328 .direct_IO = nilfs_direct_IO,
329 .is_partially_uptodate = block_is_partially_uptodate,
330 };
331
332 static int nilfs_insert_inode_locked(struct inode *inode,
333 struct nilfs_root *root,
334 unsigned long ino)
335 {
336 struct nilfs_iget_args args = {
337 .ino = ino, .root = root, .cno = 0, .for_gc = 0
338 };
339
340 return insert_inode_locked4(inode, ino, nilfs_iget_test, &args);
341 }
342
343 struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
344 {
345 struct super_block *sb = dir->i_sb;
346 struct the_nilfs *nilfs = sb->s_fs_info;
347 struct inode *inode;
348 struct nilfs_inode_info *ii;
349 struct nilfs_root *root;
350 int err = -ENOMEM;
351 ino_t ino;
352
353 inode = new_inode(sb);
354 if (unlikely(!inode))
355 goto failed;
356
357 mapping_set_gfp_mask(inode->i_mapping,
358 mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
359
360 root = NILFS_I(dir)->i_root;
361 ii = NILFS_I(inode);
362 ii->i_state = 1 << NILFS_I_NEW;
363 ii->i_root = root;
364
365 err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
366 if (unlikely(err))
367 goto failed_ifile_create_inode;
368 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
369
370 atomic64_inc(&root->inodes_count);
371 inode_init_owner(inode, dir, mode);
372 inode->i_ino = ino;
373 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
374
375 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
376 err = nilfs_bmap_read(ii->i_bmap, NULL);
377 if (err < 0)
378 goto failed_after_creation;
379
380 set_bit(NILFS_I_BMAP, &ii->i_state);
381 /* No lock is needed; iget() ensures it. */
382 }
383
384 ii->i_flags = nilfs_mask_flags(
385 mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED);
386
387 /* ii->i_file_acl = 0; */
388 /* ii->i_dir_acl = 0; */
389 ii->i_dir_start_lookup = 0;
390 nilfs_set_inode_flags(inode);
391 spin_lock(&nilfs->ns_next_gen_lock);
392 inode->i_generation = nilfs->ns_next_generation++;
393 spin_unlock(&nilfs->ns_next_gen_lock);
394 if (nilfs_insert_inode_locked(inode, root, ino) < 0) {
395 err = -EIO;
396 goto failed_after_creation;
397 }
398
399 err = nilfs_init_acl(inode, dir);
400 if (unlikely(err))
401 /*
402 * Never occur. When supporting nilfs_init_acl(),
403 * proper cancellation of above jobs should be considered.
404 */
405 goto failed_after_creation;
406
407 return inode;
408
409 failed_after_creation:
410 clear_nlink(inode);
411 unlock_new_inode(inode);
412 iput(inode); /*
413 * raw_inode will be deleted through
414 * nilfs_evict_inode().
415 */
416 goto failed;
417
418 failed_ifile_create_inode:
419 make_bad_inode(inode);
420 iput(inode);
421 failed:
422 return ERR_PTR(err);
423 }
424
425 void nilfs_set_inode_flags(struct inode *inode)
426 {
427 unsigned int flags = NILFS_I(inode)->i_flags;
428 unsigned int new_fl = 0;
429
430 if (flags & FS_SYNC_FL)
431 new_fl |= S_SYNC;
432 if (flags & FS_APPEND_FL)
433 new_fl |= S_APPEND;
434 if (flags & FS_IMMUTABLE_FL)
435 new_fl |= S_IMMUTABLE;
436 if (flags & FS_NOATIME_FL)
437 new_fl |= S_NOATIME;
438 if (flags & FS_DIRSYNC_FL)
439 new_fl |= S_DIRSYNC;
440 inode_set_flags(inode, new_fl, S_SYNC | S_APPEND | S_IMMUTABLE |
441 S_NOATIME | S_DIRSYNC);
442 }
443
444 int nilfs_read_inode_common(struct inode *inode,
445 struct nilfs_inode *raw_inode)
446 {
447 struct nilfs_inode_info *ii = NILFS_I(inode);
448 int err;
449
450 inode->i_mode = le16_to_cpu(raw_inode->i_mode);
451 i_uid_write(inode, le32_to_cpu(raw_inode->i_uid));
452 i_gid_write(inode, le32_to_cpu(raw_inode->i_gid));
453 set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
454 inode->i_size = le64_to_cpu(raw_inode->i_size);
455 inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
456 inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
457 inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
458 inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
459 inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
460 inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
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
485 static 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
540 static 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_GCINODE, &ii->i_state))
550 return !args->for_gc;
551
552 return args->for_gc && args->cno == ii->i_cno;
553 }
554
555 static int nilfs_iget_set(struct inode *inode, void *opaque)
556 {
557 struct nilfs_iget_args *args = opaque;
558
559 inode->i_ino = args->ino;
560 if (args->for_gc) {
561 NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE;
562 NILFS_I(inode)->i_cno = args->cno;
563 NILFS_I(inode)->i_root = NULL;
564 } else {
565 if (args->root && args->ino == NILFS_ROOT_INO)
566 nilfs_get_root(args->root);
567 NILFS_I(inode)->i_root = args->root;
568 }
569 return 0;
570 }
571
572 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
573 unsigned long ino)
574 {
575 struct nilfs_iget_args args = {
576 .ino = ino, .root = root, .cno = 0, .for_gc = 0
577 };
578
579 return ilookup5(sb, ino, nilfs_iget_test, &args);
580 }
581
582 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
583 unsigned long ino)
584 {
585 struct nilfs_iget_args args = {
586 .ino = ino, .root = root, .cno = 0, .for_gc = 0
587 };
588
589 return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
590 }
591
592 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
593 unsigned long ino)
594 {
595 struct inode *inode;
596 int err;
597
598 inode = nilfs_iget_locked(sb, root, ino);
599 if (unlikely(!inode))
600 return ERR_PTR(-ENOMEM);
601 if (!(inode->i_state & I_NEW))
602 return inode;
603
604 err = __nilfs_read_inode(sb, root, ino, inode);
605 if (unlikely(err)) {
606 iget_failed(inode);
607 return ERR_PTR(err);
608 }
609 unlock_new_inode(inode);
610 return inode;
611 }
612
613 struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
614 __u64 cno)
615 {
616 struct nilfs_iget_args args = {
617 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
618 };
619 struct inode *inode;
620 int err;
621
622 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
623 if (unlikely(!inode))
624 return ERR_PTR(-ENOMEM);
625 if (!(inode->i_state & I_NEW))
626 return inode;
627
628 err = nilfs_init_gcinode(inode);
629 if (unlikely(err)) {
630 iget_failed(inode);
631 return ERR_PTR(err);
632 }
633 unlock_new_inode(inode);
634 return inode;
635 }
636
637 void nilfs_write_inode_common(struct inode *inode,
638 struct nilfs_inode *raw_inode, int has_bmap)
639 {
640 struct nilfs_inode_info *ii = NILFS_I(inode);
641
642 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
643 raw_inode->i_uid = cpu_to_le32(i_uid_read(inode));
644 raw_inode->i_gid = cpu_to_le32(i_gid_read(inode));
645 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
646 raw_inode->i_size = cpu_to_le64(inode->i_size);
647 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
648 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
649 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
650 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
651 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
652
653 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
654 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
655
656 if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) {
657 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
658
659 /* zero-fill unused portion in the case of super root block */
660 raw_inode->i_xattr = 0;
661 raw_inode->i_pad = 0;
662 memset((void *)raw_inode + sizeof(*raw_inode), 0,
663 nilfs->ns_inode_size - sizeof(*raw_inode));
664 }
665
666 if (has_bmap)
667 nilfs_bmap_write(ii->i_bmap, raw_inode);
668 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
669 raw_inode->i_device_code =
670 cpu_to_le64(huge_encode_dev(inode->i_rdev));
671 /*
672 * When extending inode, nilfs->ns_inode_size should be checked
673 * for substitutions of appended fields.
674 */
675 }
676
677 void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh, int flags)
678 {
679 ino_t ino = inode->i_ino;
680 struct nilfs_inode_info *ii = NILFS_I(inode);
681 struct inode *ifile = ii->i_root->ifile;
682 struct nilfs_inode *raw_inode;
683
684 raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
685
686 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
687 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
688 if (flags & I_DIRTY_DATASYNC)
689 set_bit(NILFS_I_INODE_SYNC, &ii->i_state);
690
691 nilfs_write_inode_common(inode, raw_inode, 0);
692 /*
693 * XXX: call with has_bmap = 0 is a workaround to avoid
694 * deadlock of bmap. This delays update of i_bmap to just
695 * before writing.
696 */
697
698 nilfs_ifile_unmap_inode(ifile, ino, ibh);
699 }
700
701 #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
702
703 static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
704 unsigned long from)
705 {
706 __u64 b;
707 int ret;
708
709 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
710 return;
711 repeat:
712 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
713 if (ret == -ENOENT)
714 return;
715 else if (ret < 0)
716 goto failed;
717
718 if (b < from)
719 return;
720
721 b -= min_t(__u64, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
722 ret = nilfs_bmap_truncate(ii->i_bmap, b);
723 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
724 if (!ret || (ret == -ENOMEM &&
725 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
726 goto repeat;
727
728 failed:
729 nilfs_warning(ii->vfs_inode.i_sb, __func__,
730 "failed to truncate bmap (ino=%lu, err=%d)",
731 ii->vfs_inode.i_ino, ret);
732 }
733
734 void nilfs_truncate(struct inode *inode)
735 {
736 unsigned long blkoff;
737 unsigned int blocksize;
738 struct nilfs_transaction_info ti;
739 struct super_block *sb = inode->i_sb;
740 struct nilfs_inode_info *ii = NILFS_I(inode);
741
742 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
743 return;
744 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
745 return;
746
747 blocksize = sb->s_blocksize;
748 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
749 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
750
751 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
752
753 nilfs_truncate_bmap(ii, blkoff);
754
755 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
756 if (IS_SYNC(inode))
757 nilfs_set_transaction_flag(NILFS_TI_SYNC);
758
759 nilfs_mark_inode_dirty(inode);
760 nilfs_set_file_dirty(inode, 0);
761 nilfs_transaction_commit(sb);
762 /*
763 * May construct a logical segment and may fail in sync mode.
764 * But truncate has no return value.
765 */
766 }
767
768 static void nilfs_clear_inode(struct inode *inode)
769 {
770 struct nilfs_inode_info *ii = NILFS_I(inode);
771
772 /*
773 * Free resources allocated in nilfs_read_inode(), here.
774 */
775 BUG_ON(!list_empty(&ii->i_dirty));
776 brelse(ii->i_bh);
777 ii->i_bh = NULL;
778
779 if (nilfs_is_metadata_file_inode(inode))
780 nilfs_mdt_clear(inode);
781
782 if (test_bit(NILFS_I_BMAP, &ii->i_state))
783 nilfs_bmap_clear(ii->i_bmap);
784
785 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
786
787 if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
788 nilfs_put_root(ii->i_root);
789 }
790
791 void nilfs_evict_inode(struct inode *inode)
792 {
793 struct nilfs_transaction_info ti;
794 struct super_block *sb = inode->i_sb;
795 struct nilfs_inode_info *ii = NILFS_I(inode);
796 int ret;
797
798 if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
799 truncate_inode_pages_final(&inode->i_data);
800 clear_inode(inode);
801 nilfs_clear_inode(inode);
802 return;
803 }
804 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
805
806 truncate_inode_pages_final(&inode->i_data);
807
808 /* TODO: some of the following operations may fail. */
809 nilfs_truncate_bmap(ii, 0);
810 nilfs_mark_inode_dirty(inode);
811 clear_inode(inode);
812
813 ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
814 if (!ret)
815 atomic64_dec(&ii->i_root->inodes_count);
816
817 nilfs_clear_inode(inode);
818
819 if (IS_SYNC(inode))
820 nilfs_set_transaction_flag(NILFS_TI_SYNC);
821 nilfs_transaction_commit(sb);
822 /*
823 * May construct a logical segment and may fail in sync mode.
824 * But delete_inode has no return value.
825 */
826 }
827
828 int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
829 {
830 struct nilfs_transaction_info ti;
831 struct inode *inode = d_inode(dentry);
832 struct super_block *sb = inode->i_sb;
833 int err;
834
835 err = inode_change_ok(inode, iattr);
836 if (err)
837 return err;
838
839 err = nilfs_transaction_begin(sb, &ti, 0);
840 if (unlikely(err))
841 return err;
842
843 if ((iattr->ia_valid & ATTR_SIZE) &&
844 iattr->ia_size != i_size_read(inode)) {
845 inode_dio_wait(inode);
846 truncate_setsize(inode, iattr->ia_size);
847 nilfs_truncate(inode);
848 }
849
850 setattr_copy(inode, iattr);
851 mark_inode_dirty(inode);
852
853 if (iattr->ia_valid & ATTR_MODE) {
854 err = nilfs_acl_chmod(inode);
855 if (unlikely(err))
856 goto out_err;
857 }
858
859 return nilfs_transaction_commit(sb);
860
861 out_err:
862 nilfs_transaction_abort(sb);
863 return err;
864 }
865
866 int nilfs_permission(struct inode *inode, int mask)
867 {
868 struct nilfs_root *root = NILFS_I(inode)->i_root;
869
870 if ((mask & MAY_WRITE) && root &&
871 root->cno != NILFS_CPTREE_CURRENT_CNO)
872 return -EROFS; /* snapshot is not writable */
873
874 return generic_permission(inode, mask);
875 }
876
877 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
878 {
879 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
880 struct nilfs_inode_info *ii = NILFS_I(inode);
881 int err;
882
883 spin_lock(&nilfs->ns_inode_lock);
884 if (ii->i_bh == NULL) {
885 spin_unlock(&nilfs->ns_inode_lock);
886 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
887 inode->i_ino, pbh);
888 if (unlikely(err))
889 return err;
890 spin_lock(&nilfs->ns_inode_lock);
891 if (ii->i_bh == NULL)
892 ii->i_bh = *pbh;
893 else {
894 brelse(*pbh);
895 *pbh = ii->i_bh;
896 }
897 } else
898 *pbh = ii->i_bh;
899
900 get_bh(*pbh);
901 spin_unlock(&nilfs->ns_inode_lock);
902 return 0;
903 }
904
905 int nilfs_inode_dirty(struct inode *inode)
906 {
907 struct nilfs_inode_info *ii = NILFS_I(inode);
908 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
909 int ret = 0;
910
911 if (!list_empty(&ii->i_dirty)) {
912 spin_lock(&nilfs->ns_inode_lock);
913 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
914 test_bit(NILFS_I_BUSY, &ii->i_state);
915 spin_unlock(&nilfs->ns_inode_lock);
916 }
917 return ret;
918 }
919
920 int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty)
921 {
922 struct nilfs_inode_info *ii = NILFS_I(inode);
923 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
924
925 atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
926
927 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
928 return 0;
929
930 spin_lock(&nilfs->ns_inode_lock);
931 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
932 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
933 /*
934 * Because this routine may race with nilfs_dispose_list(),
935 * we have to check NILFS_I_QUEUED here, too.
936 */
937 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
938 /*
939 * This will happen when somebody is freeing
940 * this inode.
941 */
942 nilfs_warning(inode->i_sb, __func__,
943 "cannot get inode (ino=%lu)",
944 inode->i_ino);
945 spin_unlock(&nilfs->ns_inode_lock);
946 return -EINVAL; /*
947 * NILFS_I_DIRTY may remain for
948 * freeing inode.
949 */
950 }
951 list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
952 set_bit(NILFS_I_QUEUED, &ii->i_state);
953 }
954 spin_unlock(&nilfs->ns_inode_lock);
955 return 0;
956 }
957
958 int __nilfs_mark_inode_dirty(struct inode *inode, int flags)
959 {
960 struct buffer_head *ibh;
961 int err;
962
963 err = nilfs_load_inode_block(inode, &ibh);
964 if (unlikely(err)) {
965 nilfs_warning(inode->i_sb, __func__,
966 "failed to reget inode block.");
967 return err;
968 }
969 nilfs_update_inode(inode, ibh, flags);
970 mark_buffer_dirty(ibh);
971 nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
972 brelse(ibh);
973 return 0;
974 }
975
976 /**
977 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
978 * @inode: inode of the file to be registered.
979 *
980 * nilfs_dirty_inode() loads a inode block containing the specified
981 * @inode and copies data from a nilfs_inode to a corresponding inode
982 * entry in the inode block. This operation is excluded from the segment
983 * construction. This function can be called both as a single operation
984 * and as a part of indivisible file operations.
985 */
986 void nilfs_dirty_inode(struct inode *inode, int flags)
987 {
988 struct nilfs_transaction_info ti;
989 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
990
991 if (is_bad_inode(inode)) {
992 nilfs_warning(inode->i_sb, __func__,
993 "tried to mark bad_inode dirty. ignored.");
994 dump_stack();
995 return;
996 }
997 if (mdi) {
998 nilfs_mdt_mark_dirty(inode);
999 return;
1000 }
1001 nilfs_transaction_begin(inode->i_sb, &ti, 0);
1002 __nilfs_mark_inode_dirty(inode, flags);
1003 nilfs_transaction_commit(inode->i_sb); /* never fails */
1004 }
1005
1006 int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1007 __u64 start, __u64 len)
1008 {
1009 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
1010 __u64 logical = 0, phys = 0, size = 0;
1011 __u32 flags = 0;
1012 loff_t isize;
1013 sector_t blkoff, end_blkoff;
1014 sector_t delalloc_blkoff;
1015 unsigned long delalloc_blklen;
1016 unsigned int blkbits = inode->i_blkbits;
1017 int ret, n;
1018
1019 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1020 if (ret)
1021 return ret;
1022
1023 inode_lock(inode);
1024
1025 isize = i_size_read(inode);
1026
1027 blkoff = start >> blkbits;
1028 end_blkoff = (start + len - 1) >> blkbits;
1029
1030 delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
1031 &delalloc_blkoff);
1032
1033 do {
1034 __u64 blkphy;
1035 unsigned int maxblocks;
1036
1037 if (delalloc_blklen && blkoff == delalloc_blkoff) {
1038 if (size) {
1039 /* End of the current extent */
1040 ret = fiemap_fill_next_extent(
1041 fieinfo, logical, phys, size, flags);
1042 if (ret)
1043 break;
1044 }
1045 if (blkoff > end_blkoff)
1046 break;
1047
1048 flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
1049 logical = blkoff << blkbits;
1050 phys = 0;
1051 size = delalloc_blklen << blkbits;
1052
1053 blkoff = delalloc_blkoff + delalloc_blklen;
1054 delalloc_blklen = nilfs_find_uncommitted_extent(
1055 inode, blkoff, &delalloc_blkoff);
1056 continue;
1057 }
1058
1059 /*
1060 * Limit the number of blocks that we look up so as
1061 * not to get into the next delayed allocation extent.
1062 */
1063 maxblocks = INT_MAX;
1064 if (delalloc_blklen)
1065 maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
1066 maxblocks);
1067 blkphy = 0;
1068
1069 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1070 n = nilfs_bmap_lookup_contig(
1071 NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
1072 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
1073
1074 if (n < 0) {
1075 int past_eof;
1076
1077 if (unlikely(n != -ENOENT))
1078 break; /* error */
1079
1080 /* HOLE */
1081 blkoff++;
1082 past_eof = ((blkoff << blkbits) >= isize);
1083
1084 if (size) {
1085 /* End of the current extent */
1086
1087 if (past_eof)
1088 flags |= FIEMAP_EXTENT_LAST;
1089
1090 ret = fiemap_fill_next_extent(
1091 fieinfo, logical, phys, size, flags);
1092 if (ret)
1093 break;
1094 size = 0;
1095 }
1096 if (blkoff > end_blkoff || past_eof)
1097 break;
1098 } else {
1099 if (size) {
1100 if (phys && blkphy << blkbits == phys + size) {
1101 /* The current extent goes on */
1102 size += n << blkbits;
1103 } else {
1104 /* Terminate the current extent */
1105 ret = fiemap_fill_next_extent(
1106 fieinfo, logical, phys, size,
1107 flags);
1108 if (ret || blkoff > end_blkoff)
1109 break;
1110
1111 /* Start another extent */
1112 flags = FIEMAP_EXTENT_MERGED;
1113 logical = blkoff << blkbits;
1114 phys = blkphy << blkbits;
1115 size = n << blkbits;
1116 }
1117 } else {
1118 /* Start a new extent */
1119 flags = FIEMAP_EXTENT_MERGED;
1120 logical = blkoff << blkbits;
1121 phys = blkphy << blkbits;
1122 size = n << blkbits;
1123 }
1124 blkoff += n;
1125 }
1126 cond_resched();
1127 } while (true);
1128
1129 /* If ret is 1 then we just hit the end of the extent array */
1130 if (ret == 1)
1131 ret = 0;
1132
1133 inode_unlock(inode);
1134 return ret;
1135 }
Linux with added FPC-III support