blob: fe9d8f2a13f8785bf366f0a5884261af8ccfd782 [file] [log] [blame]
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -07001/*
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 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Ryusuke Konishi <ryusuke@osrg.net>
21 *
22 */
23
24#include <linux/buffer_head.h>
25#include <linux/mpage.h>
26#include <linux/writeback.h>
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -070027#include <linux/uio.h>
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070028#include "nilfs.h"
29#include "segment.h"
30#include "page.h"
31#include "mdt.h"
32#include "cpfile.h"
33#include "ifile.h"
34
35
36/**
37 * nilfs_get_block() - get a file block on the filesystem (callback function)
38 * @inode - inode struct of the target file
39 * @blkoff - file block number
40 * @bh_result - buffer head to be mapped on
41 * @create - indicate whether allocating the block or not when it has not
42 * been allocated yet.
43 *
44 * This function does not issue actual read request of the specified data
45 * block. It is done by VFS.
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070046 */
47int nilfs_get_block(struct inode *inode, sector_t blkoff,
48 struct buffer_head *bh_result, int create)
49{
50 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090051 __u64 blknum = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070052 int err = 0, ret;
53 struct inode *dat = nilfs_dat_inode(NILFS_I_NILFS(inode));
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090054 unsigned maxblocks = bh_result->b_size >> inode->i_blkbits;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070055
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090056 down_read(&NILFS_MDT(dat)->mi_sem);
57 ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
58 up_read(&NILFS_MDT(dat)->mi_sem);
59 if (ret >= 0) { /* found */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070060 map_bh(bh_result, inode->i_sb, blknum);
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090061 if (ret > 0)
62 bh_result->b_size = (ret << inode->i_blkbits);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070063 goto out;
64 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070065 /* data block was not found */
66 if (ret == -ENOENT && create) {
67 struct nilfs_transaction_info ti;
68
69 bh_result->b_blocknr = 0;
70 err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
71 if (unlikely(err))
72 goto out;
73 err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff,
74 (unsigned long)bh_result);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070075 if (unlikely(err != 0)) {
76 if (err == -EEXIST) {
77 /*
78 * The get_block() function could be called
79 * from multiple callers for an inode.
80 * However, the page having this block must
81 * be locked in this case.
82 */
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -070083 printk(KERN_WARNING
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070084 "nilfs_get_block: a race condition "
85 "while inserting a data block. "
86 "(inode number=%lu, file block "
87 "offset=%llu)\n",
88 inode->i_ino,
89 (unsigned long long)blkoff);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -070090 err = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070091 } else if (err == -EINVAL) {
92 nilfs_error(inode->i_sb, __func__,
93 "broken bmap (inode=%lu)\n",
94 inode->i_ino);
95 err = -EIO;
96 }
Ryusuke Konishi47420c72009-04-06 19:01:45 -070097 nilfs_transaction_abort(inode->i_sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070098 goto out;
99 }
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700100 nilfs_transaction_commit(inode->i_sb); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700101 /* Error handling should be detailed */
102 set_buffer_new(bh_result);
103 map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed
104 to proper value */
105 } else if (ret == -ENOENT) {
106 /* not found is not error (e.g. hole); must return without
107 the mapped state flag. */
108 ;
109 } else {
110 err = ret;
111 }
112
113 out:
114 return err;
115}
116
117/**
118 * nilfs_readpage() - implement readpage() method of nilfs_aops {}
119 * address_space_operations.
120 * @file - file struct of the file to be read
121 * @page - the page to be read
122 */
123static int nilfs_readpage(struct file *file, struct page *page)
124{
125 return mpage_readpage(page, nilfs_get_block);
126}
127
128/**
129 * nilfs_readpages() - implement readpages() method of nilfs_aops {}
130 * address_space_operations.
131 * @file - file struct of the file to be read
132 * @mapping - address_space struct used for reading multiple pages
133 * @pages - the pages to be read
134 * @nr_pages - number of pages to be read
135 */
136static int nilfs_readpages(struct file *file, struct address_space *mapping,
137 struct list_head *pages, unsigned nr_pages)
138{
139 return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
140}
141
142static int nilfs_writepages(struct address_space *mapping,
143 struct writeback_control *wbc)
144{
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700145 struct inode *inode = mapping->host;
146 int err = 0;
147
148 if (wbc->sync_mode == WB_SYNC_ALL)
149 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
150 wbc->range_start,
151 wbc->range_end);
152 return err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700153}
154
155static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
156{
157 struct inode *inode = page->mapping->host;
158 int err;
159
160 redirty_page_for_writepage(wbc, page);
161 unlock_page(page);
162
163 if (wbc->sync_mode == WB_SYNC_ALL) {
164 err = nilfs_construct_segment(inode->i_sb);
165 if (unlikely(err))
166 return err;
167 } else if (wbc->for_reclaim)
168 nilfs_flush_segment(inode->i_sb, inode->i_ino);
169
170 return 0;
171}
172
173static int nilfs_set_page_dirty(struct page *page)
174{
175 int ret = __set_page_dirty_buffers(page);
176
177 if (ret) {
178 struct inode *inode = page->mapping->host;
179 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
180 unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
181
182 nilfs_set_file_dirty(sbi, inode, nr_dirty);
183 }
184 return ret;
185}
186
187static int nilfs_write_begin(struct file *file, struct address_space *mapping,
188 loff_t pos, unsigned len, unsigned flags,
189 struct page **pagep, void **fsdata)
190
191{
192 struct inode *inode = mapping->host;
193 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
194
195 if (unlikely(err))
196 return err;
197
198 *pagep = NULL;
199 err = block_write_begin(file, mapping, pos, len, flags, pagep,
200 fsdata, nilfs_get_block);
201 if (unlikely(err))
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700202 nilfs_transaction_abort(inode->i_sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700203 return err;
204}
205
206static int nilfs_write_end(struct file *file, struct address_space *mapping,
207 loff_t pos, unsigned len, unsigned copied,
208 struct page *page, void *fsdata)
209{
210 struct inode *inode = mapping->host;
211 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
212 unsigned nr_dirty;
213 int err;
214
215 nr_dirty = nilfs_page_count_clean_buffers(page, start,
216 start + copied);
217 copied = generic_write_end(file, mapping, pos, len, copied, page,
218 fsdata);
219 nilfs_set_file_dirty(NILFS_SB(inode->i_sb), inode, nr_dirty);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700220 err = nilfs_transaction_commit(inode->i_sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700221 return err ? : copied;
222}
223
224static ssize_t
225nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
226 loff_t offset, unsigned long nr_segs)
227{
228 struct file *file = iocb->ki_filp;
229 struct inode *inode = file->f_mapping->host;
230 ssize_t size;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700231
232 if (rw == WRITE)
233 return 0;
234
235 /* Needs synchronization with the cleaner */
236 size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
237 offset, nr_segs, nilfs_get_block, NULL);
238 return size;
239}
240
241struct address_space_operations nilfs_aops = {
242 .writepage = nilfs_writepage,
243 .readpage = nilfs_readpage,
Ryusuke Konishie85dc1d2009-05-27 07:27:12 +0900244 .sync_page = block_sync_page,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700245 .writepages = nilfs_writepages,
246 .set_page_dirty = nilfs_set_page_dirty,
247 .readpages = nilfs_readpages,
248 .write_begin = nilfs_write_begin,
249 .write_end = nilfs_write_end,
250 /* .releasepage = nilfs_releasepage, */
251 .invalidatepage = block_invalidatepage,
252 .direct_IO = nilfs_direct_IO,
Hisashi Hifumi258ef672009-05-13 11:19:40 +0900253 .is_partially_uptodate = block_is_partially_uptodate,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700254};
255
256struct inode *nilfs_new_inode(struct inode *dir, int mode)
257{
258 struct super_block *sb = dir->i_sb;
259 struct nilfs_sb_info *sbi = NILFS_SB(sb);
260 struct inode *inode;
261 struct nilfs_inode_info *ii;
262 int err = -ENOMEM;
263 ino_t ino;
264
265 inode = new_inode(sb);
266 if (unlikely(!inode))
267 goto failed;
268
269 mapping_set_gfp_mask(inode->i_mapping,
270 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
271
272 ii = NILFS_I(inode);
273 ii->i_state = 1 << NILFS_I_NEW;
274
275 err = nilfs_ifile_create_inode(sbi->s_ifile, &ino, &ii->i_bh);
276 if (unlikely(err))
277 goto failed_ifile_create_inode;
278 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
279
280 atomic_inc(&sbi->s_inodes_count);
281
282 inode->i_uid = current_fsuid();
283 if (dir->i_mode & S_ISGID) {
284 inode->i_gid = dir->i_gid;
285 if (S_ISDIR(mode))
286 mode |= S_ISGID;
287 } else
288 inode->i_gid = current_fsgid();
289
290 inode->i_mode = mode;
291 inode->i_ino = ino;
292 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
293
294 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
295 err = nilfs_bmap_read(ii->i_bmap, NULL);
296 if (err < 0)
297 goto failed_bmap;
298
299 set_bit(NILFS_I_BMAP, &ii->i_state);
300 /* No lock is needed; iget() ensures it. */
301 }
302
303 ii->i_flags = NILFS_I(dir)->i_flags;
304 if (S_ISLNK(mode))
305 ii->i_flags &= ~(NILFS_IMMUTABLE_FL | NILFS_APPEND_FL);
306 if (!S_ISDIR(mode))
307 ii->i_flags &= ~NILFS_DIRSYNC_FL;
308
309 /* ii->i_file_acl = 0; */
310 /* ii->i_dir_acl = 0; */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700311 ii->i_dir_start_lookup = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700312 ii->i_cno = 0;
313 nilfs_set_inode_flags(inode);
314 spin_lock(&sbi->s_next_gen_lock);
315 inode->i_generation = sbi->s_next_generation++;
316 spin_unlock(&sbi->s_next_gen_lock);
317 insert_inode_hash(inode);
318
319 err = nilfs_init_acl(inode, dir);
320 if (unlikely(err))
321 goto failed_acl; /* never occur. When supporting
322 nilfs_init_acl(), proper cancellation of
323 above jobs should be considered */
324
325 mark_inode_dirty(inode);
326 return inode;
327
328 failed_acl:
329 failed_bmap:
330 inode->i_nlink = 0;
331 iput(inode); /* raw_inode will be deleted through
332 generic_delete_inode() */
333 goto failed;
334
335 failed_ifile_create_inode:
336 make_bad_inode(inode);
337 iput(inode); /* if i_nlink == 1, generic_forget_inode() will be
338 called */
339 failed:
340 return ERR_PTR(err);
341}
342
343void nilfs_free_inode(struct inode *inode)
344{
345 struct super_block *sb = inode->i_sb;
346 struct nilfs_sb_info *sbi = NILFS_SB(sb);
347
348 clear_inode(inode);
349 /* XXX: check error code? Is there any thing I can do? */
350 (void) nilfs_ifile_delete_inode(sbi->s_ifile, inode->i_ino);
351 atomic_dec(&sbi->s_inodes_count);
352}
353
354void nilfs_set_inode_flags(struct inode *inode)
355{
356 unsigned int flags = NILFS_I(inode)->i_flags;
357
358 inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
359 S_DIRSYNC);
360 if (flags & NILFS_SYNC_FL)
361 inode->i_flags |= S_SYNC;
362 if (flags & NILFS_APPEND_FL)
363 inode->i_flags |= S_APPEND;
364 if (flags & NILFS_IMMUTABLE_FL)
365 inode->i_flags |= S_IMMUTABLE;
366#ifndef NILFS_ATIME_DISABLE
367 if (flags & NILFS_NOATIME_FL)
368#endif
369 inode->i_flags |= S_NOATIME;
370 if (flags & NILFS_DIRSYNC_FL)
371 inode->i_flags |= S_DIRSYNC;
372 mapping_set_gfp_mask(inode->i_mapping,
373 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
374}
375
376int nilfs_read_inode_common(struct inode *inode,
377 struct nilfs_inode *raw_inode)
378{
379 struct nilfs_inode_info *ii = NILFS_I(inode);
380 int err;
381
382 inode->i_mode = le16_to_cpu(raw_inode->i_mode);
383 inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid);
384 inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid);
385 inode->i_nlink = le16_to_cpu(raw_inode->i_links_count);
386 inode->i_size = le64_to_cpu(raw_inode->i_size);
387 inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
388 inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
389 inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
Ryusuke Konishi61239232009-04-06 19:02:00 -0700390 inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
391 inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
392 inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
393 if (inode->i_nlink == 0 && inode->i_mode == 0)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700394 return -EINVAL; /* this inode is deleted */
395
396 inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
397 ii->i_flags = le32_to_cpu(raw_inode->i_flags);
398#if 0
399 ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
400 ii->i_dir_acl = S_ISREG(inode->i_mode) ?
401 0 : le32_to_cpu(raw_inode->i_dir_acl);
402#endif
403 ii->i_cno = 0;
404 inode->i_generation = le32_to_cpu(raw_inode->i_generation);
405
406 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
407 S_ISLNK(inode->i_mode)) {
408 err = nilfs_bmap_read(ii->i_bmap, raw_inode);
409 if (err < 0)
410 return err;
411 set_bit(NILFS_I_BMAP, &ii->i_state);
412 /* No lock is needed; iget() ensures it. */
413 }
414 return 0;
415}
416
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700417static int __nilfs_read_inode(struct super_block *sb, unsigned long ino,
418 struct inode *inode)
419{
420 struct nilfs_sb_info *sbi = NILFS_SB(sb);
421 struct inode *dat = nilfs_dat_inode(sbi->s_nilfs);
422 struct buffer_head *bh;
423 struct nilfs_inode *raw_inode;
424 int err;
425
426 down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
427 err = nilfs_ifile_get_inode_block(sbi->s_ifile, ino, &bh);
428 if (unlikely(err))
429 goto bad_inode;
430
431 raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, bh);
432
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700433 if (nilfs_read_inode_common(inode, raw_inode))
434 goto failed_unmap;
435
436 if (S_ISREG(inode->i_mode)) {
437 inode->i_op = &nilfs_file_inode_operations;
438 inode->i_fop = &nilfs_file_operations;
439 inode->i_mapping->a_ops = &nilfs_aops;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700440 } else if (S_ISDIR(inode->i_mode)) {
441 inode->i_op = &nilfs_dir_inode_operations;
442 inode->i_fop = &nilfs_dir_operations;
443 inode->i_mapping->a_ops = &nilfs_aops;
444 } else if (S_ISLNK(inode->i_mode)) {
445 inode->i_op = &nilfs_symlink_inode_operations;
446 inode->i_mapping->a_ops = &nilfs_aops;
447 } else {
448 inode->i_op = &nilfs_special_inode_operations;
449 init_special_inode(
450 inode, inode->i_mode,
451 new_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
452 }
453 nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh);
454 brelse(bh);
455 up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
456 nilfs_set_inode_flags(inode);
457 return 0;
458
459 failed_unmap:
460 nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh);
461 brelse(bh);
462
463 bad_inode:
464 up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */
465 return err;
466}
467
468struct inode *nilfs_iget(struct super_block *sb, unsigned long ino)
469{
470 struct inode *inode;
471 int err;
472
473 inode = iget_locked(sb, ino);
474 if (unlikely(!inode))
475 return ERR_PTR(-ENOMEM);
476 if (!(inode->i_state & I_NEW))
477 return inode;
478
479 err = __nilfs_read_inode(sb, ino, inode);
480 if (unlikely(err)) {
481 iget_failed(inode);
482 return ERR_PTR(err);
483 }
484 unlock_new_inode(inode);
485 return inode;
486}
487
488void nilfs_write_inode_common(struct inode *inode,
489 struct nilfs_inode *raw_inode, int has_bmap)
490{
491 struct nilfs_inode_info *ii = NILFS_I(inode);
492
493 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
494 raw_inode->i_uid = cpu_to_le32(inode->i_uid);
495 raw_inode->i_gid = cpu_to_le32(inode->i_gid);
496 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
497 raw_inode->i_size = cpu_to_le64(inode->i_size);
498 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
499 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
Ryusuke Konishi61239232009-04-06 19:02:00 -0700500 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
501 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700502 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
503
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700504 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
505 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
506
507 if (has_bmap)
508 nilfs_bmap_write(ii->i_bmap, raw_inode);
509 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
510 raw_inode->i_device_code =
511 cpu_to_le64(new_encode_dev(inode->i_rdev));
512 /* When extending inode, nilfs->ns_inode_size should be checked
513 for substitutions of appended fields */
514}
515
516void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh)
517{
518 ino_t ino = inode->i_ino;
519 struct nilfs_inode_info *ii = NILFS_I(inode);
520 struct super_block *sb = inode->i_sb;
521 struct nilfs_sb_info *sbi = NILFS_SB(sb);
522 struct nilfs_inode *raw_inode;
523
524 raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, ibh);
525
526 /* The buffer is guarded with lock_buffer() by the caller */
527 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
528 memset(raw_inode, 0, NILFS_MDT(sbi->s_ifile)->mi_entry_size);
529 set_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
530
531 nilfs_write_inode_common(inode, raw_inode, 0);
532 /* XXX: call with has_bmap = 0 is a workaround to avoid
533 deadlock of bmap. This delays update of i_bmap to just
534 before writing */
535 nilfs_ifile_unmap_inode(sbi->s_ifile, ino, ibh);
536}
537
538#define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
539
540static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
541 unsigned long from)
542{
543 unsigned long b;
544 int ret;
545
546 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
547 return;
548 repeat:
549 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
550 if (ret == -ENOENT)
551 return;
552 else if (ret < 0)
553 goto failed;
554
555 if (b < from)
556 return;
557
558 b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
559 ret = nilfs_bmap_truncate(ii->i_bmap, b);
560 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
561 if (!ret || (ret == -ENOMEM &&
562 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
563 goto repeat;
564
565 failed:
566 if (ret == -EINVAL)
567 nilfs_error(ii->vfs_inode.i_sb, __func__,
568 "bmap is broken (ino=%lu)", ii->vfs_inode.i_ino);
569 else
570 nilfs_warning(ii->vfs_inode.i_sb, __func__,
571 "failed to truncate bmap (ino=%lu, err=%d)",
572 ii->vfs_inode.i_ino, ret);
573}
574
575void nilfs_truncate(struct inode *inode)
576{
577 unsigned long blkoff;
578 unsigned int blocksize;
579 struct nilfs_transaction_info ti;
580 struct super_block *sb = inode->i_sb;
581 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700582
583 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
584 return;
585 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
586 return;
587
588 blocksize = sb->s_blocksize;
589 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700590 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700591
592 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
593
594 nilfs_truncate_bmap(ii, blkoff);
595
596 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
597 if (IS_SYNC(inode))
598 nilfs_set_transaction_flag(NILFS_TI_SYNC);
599
600 nilfs_set_file_dirty(NILFS_SB(sb), inode, 0);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700601 nilfs_transaction_commit(sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700602 /* May construct a logical segment and may fail in sync mode.
603 But truncate has no return value. */
604}
605
606void nilfs_delete_inode(struct inode *inode)
607{
608 struct nilfs_transaction_info ti;
609 struct super_block *sb = inode->i_sb;
610 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700611
612 if (unlikely(is_bad_inode(inode))) {
613 if (inode->i_data.nrpages)
614 truncate_inode_pages(&inode->i_data, 0);
615 clear_inode(inode);
616 return;
617 }
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700618 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
619
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700620 if (inode->i_data.nrpages)
621 truncate_inode_pages(&inode->i_data, 0);
622
623 nilfs_truncate_bmap(ii, 0);
624 nilfs_free_inode(inode);
625 /* nilfs_free_inode() marks inode buffer dirty */
626 if (IS_SYNC(inode))
627 nilfs_set_transaction_flag(NILFS_TI_SYNC);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700628 nilfs_transaction_commit(sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700629 /* May construct a logical segment and may fail in sync mode.
630 But delete_inode has no return value. */
631}
632
633int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
634{
635 struct nilfs_transaction_info ti;
636 struct inode *inode = dentry->d_inode;
637 struct super_block *sb = inode->i_sb;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700638 int err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700639
640 err = inode_change_ok(inode, iattr);
641 if (err)
642 return err;
643
644 err = nilfs_transaction_begin(sb, &ti, 0);
645 if (unlikely(err))
646 return err;
647 err = inode_setattr(inode, iattr);
648 if (!err && (iattr->ia_valid & ATTR_MODE))
649 err = nilfs_acl_chmod(inode);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700650 if (likely(!err))
651 err = nilfs_transaction_commit(sb);
652 else
653 nilfs_transaction_abort(sb);
654
655 return err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700656}
657
658int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode,
659 struct buffer_head **pbh)
660{
661 struct nilfs_inode_info *ii = NILFS_I(inode);
662 int err;
663
664 spin_lock(&sbi->s_inode_lock);
665 /* Caller of this function MUST lock s_inode_lock */
666 if (ii->i_bh == NULL) {
667 spin_unlock(&sbi->s_inode_lock);
668 err = nilfs_ifile_get_inode_block(sbi->s_ifile, inode->i_ino,
669 pbh);
670 if (unlikely(err))
671 return err;
672 spin_lock(&sbi->s_inode_lock);
673 if (ii->i_bh == NULL)
674 ii->i_bh = *pbh;
675 else {
676 brelse(*pbh);
677 *pbh = ii->i_bh;
678 }
679 } else
680 *pbh = ii->i_bh;
681
682 get_bh(*pbh);
683 spin_unlock(&sbi->s_inode_lock);
684 return 0;
685}
686
687int nilfs_inode_dirty(struct inode *inode)
688{
689 struct nilfs_inode_info *ii = NILFS_I(inode);
690 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
691 int ret = 0;
692
693 if (!list_empty(&ii->i_dirty)) {
694 spin_lock(&sbi->s_inode_lock);
695 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
696 test_bit(NILFS_I_BUSY, &ii->i_state);
697 spin_unlock(&sbi->s_inode_lock);
698 }
699 return ret;
700}
701
702int nilfs_set_file_dirty(struct nilfs_sb_info *sbi, struct inode *inode,
703 unsigned nr_dirty)
704{
705 struct nilfs_inode_info *ii = NILFS_I(inode);
706
707 atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks);
708
Ryusuke Konishi458c5b02009-04-06 19:01:56 -0700709 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700710 return 0;
711
712 spin_lock(&sbi->s_inode_lock);
713 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
714 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
715 /* Because this routine may race with nilfs_dispose_list(),
716 we have to check NILFS_I_QUEUED here, too. */
717 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
718 /* This will happen when somebody is freeing
719 this inode. */
720 nilfs_warning(sbi->s_super, __func__,
721 "cannot get inode (ino=%lu)\n",
722 inode->i_ino);
723 spin_unlock(&sbi->s_inode_lock);
724 return -EINVAL; /* NILFS_I_DIRTY may remain for
725 freeing inode */
726 }
727 list_del(&ii->i_dirty);
728 list_add_tail(&ii->i_dirty, &sbi->s_dirty_files);
729 set_bit(NILFS_I_QUEUED, &ii->i_state);
730 }
731 spin_unlock(&sbi->s_inode_lock);
732 return 0;
733}
734
735int nilfs_mark_inode_dirty(struct inode *inode)
736{
737 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
738 struct buffer_head *ibh;
739 int err;
740
741 err = nilfs_load_inode_block(sbi, inode, &ibh);
742 if (unlikely(err)) {
743 nilfs_warning(inode->i_sb, __func__,
744 "failed to reget inode block.\n");
745 return err;
746 }
747 lock_buffer(ibh);
748 nilfs_update_inode(inode, ibh);
749 unlock_buffer(ibh);
750 nilfs_mdt_mark_buffer_dirty(ibh);
751 nilfs_mdt_mark_dirty(sbi->s_ifile);
752 brelse(ibh);
753 return 0;
754}
755
756/**
757 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
758 * @inode: inode of the file to be registered.
759 *
760 * nilfs_dirty_inode() loads a inode block containing the specified
761 * @inode and copies data from a nilfs_inode to a corresponding inode
762 * entry in the inode block. This operation is excluded from the segment
763 * construction. This function can be called both as a single operation
764 * and as a part of indivisible file operations.
765 */
766void nilfs_dirty_inode(struct inode *inode)
767{
768 struct nilfs_transaction_info ti;
769
770 if (is_bad_inode(inode)) {
771 nilfs_warning(inode->i_sb, __func__,
772 "tried to mark bad_inode dirty. ignored.\n");
773 dump_stack();
774 return;
775 }
776 nilfs_transaction_begin(inode->i_sb, &ti, 0);
Ryusuke Konishi458c5b02009-04-06 19:01:56 -0700777 nilfs_mark_inode_dirty(inode);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700778 nilfs_transaction_commit(inode->i_sb); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700779}