]>
Commit | Line | Data |
---|---|---|
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 | * | |
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> | |
f30bf3e4 | 27 | #include <linux/uio.h> |
05fe58fd RK |
28 | #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. | |
05fe58fd RK |
46 | */ |
47 | int 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); | |
c3a7abf0 | 51 | __u64 blknum = 0; |
05fe58fd RK |
52 | int err = 0, ret; |
53 | struct inode *dat = nilfs_dat_inode(NILFS_I_NILFS(inode)); | |
c3a7abf0 | 54 | unsigned maxblocks = bh_result->b_size >> inode->i_blkbits; |
05fe58fd | 55 | |
c3a7abf0 RK |
56 | 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 */ | |
05fe58fd | 60 | map_bh(bh_result, inode->i_sb, blknum); |
c3a7abf0 RK |
61 | if (ret > 0) |
62 | bh_result->b_size = (ret << inode->i_blkbits); | |
05fe58fd RK |
63 | goto out; |
64 | } | |
05fe58fd RK |
65 | /* 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); | |
05fe58fd RK |
75 | 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 | */ | |
1f5abe7e | 83 | printk(KERN_WARNING |
05fe58fd RK |
84 | "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); | |
1f5abe7e | 90 | err = 0; |
05fe58fd RK |
91 | } 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 | } | |
47420c79 | 97 | nilfs_transaction_abort(inode->i_sb); |
05fe58fd RK |
98 | goto out; |
99 | } | |
47420c79 | 100 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
05fe58fd RK |
101 | /* 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 | */ | |
123 | static 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 | */ | |
136 | static 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 | ||
142 | static int nilfs_writepages(struct address_space *mapping, | |
143 | struct writeback_control *wbc) | |
144 | { | |
f30bf3e4 RK |
145 | 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; | |
05fe58fd RK |
153 | } |
154 | ||
155 | static 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 | ||
173 | static 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 | ||
187 | static 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)) | |
47420c79 | 202 | nilfs_transaction_abort(inode->i_sb); |
05fe58fd RK |
203 | return err; |
204 | } | |
205 | ||
206 | static 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); | |
47420c79 | 220 | err = nilfs_transaction_commit(inode->i_sb); |
05fe58fd RK |
221 | return err ? : copied; |
222 | } | |
223 | ||
224 | static ssize_t | |
225 | nilfs_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; | |
05fe58fd RK |
231 | |
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 | ||
241 | struct address_space_operations nilfs_aops = { | |
242 | .writepage = nilfs_writepage, | |
243 | .readpage = nilfs_readpage, | |
e85dc1d5 | 244 | .sync_page = block_sync_page, |
05fe58fd RK |
245 | .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, | |
258ef67e | 253 | .is_partially_uptodate = block_is_partially_uptodate, |
05fe58fd RK |
254 | }; |
255 | ||
256 | struct 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; */ | |
05fe58fd | 311 | ii->i_dir_start_lookup = 0; |
05fe58fd RK |
312 | 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 | ||
343 | void 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 | ||
354 | void 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 | ||
376 | int 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); | |
61239230 RK |
390 | 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) | |
05fe58fd RK |
394 | 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 | ||
05fe58fd RK |
417 | static 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 | ||
1b2f5a64 RK |
433 | err = nilfs_read_inode_common(inode, raw_inode); |
434 | if (err) | |
05fe58fd RK |
435 | goto failed_unmap; |
436 | ||
437 | if (S_ISREG(inode->i_mode)) { | |
438 | inode->i_op = &nilfs_file_inode_operations; | |
439 | inode->i_fop = &nilfs_file_operations; | |
440 | inode->i_mapping->a_ops = &nilfs_aops; | |
05fe58fd RK |
441 | } else if (S_ISDIR(inode->i_mode)) { |
442 | inode->i_op = &nilfs_dir_inode_operations; | |
443 | inode->i_fop = &nilfs_dir_operations; | |
444 | inode->i_mapping->a_ops = &nilfs_aops; | |
445 | } else if (S_ISLNK(inode->i_mode)) { | |
446 | inode->i_op = &nilfs_symlink_inode_operations; | |
447 | inode->i_mapping->a_ops = &nilfs_aops; | |
448 | } else { | |
449 | inode->i_op = &nilfs_special_inode_operations; | |
450 | init_special_inode( | |
451 | inode, inode->i_mode, | |
452 | new_decode_dev(le64_to_cpu(raw_inode->i_device_code))); | |
453 | } | |
454 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh); | |
455 | brelse(bh); | |
456 | up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
457 | nilfs_set_inode_flags(inode); | |
458 | return 0; | |
459 | ||
460 | failed_unmap: | |
461 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh); | |
462 | brelse(bh); | |
463 | ||
464 | bad_inode: | |
465 | up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
466 | return err; | |
467 | } | |
468 | ||
469 | struct inode *nilfs_iget(struct super_block *sb, unsigned long ino) | |
470 | { | |
471 | struct inode *inode; | |
472 | int err; | |
473 | ||
474 | inode = iget_locked(sb, ino); | |
475 | if (unlikely(!inode)) | |
476 | return ERR_PTR(-ENOMEM); | |
477 | if (!(inode->i_state & I_NEW)) | |
478 | return inode; | |
479 | ||
480 | err = __nilfs_read_inode(sb, ino, inode); | |
481 | if (unlikely(err)) { | |
482 | iget_failed(inode); | |
483 | return ERR_PTR(err); | |
484 | } | |
485 | unlock_new_inode(inode); | |
486 | return inode; | |
487 | } | |
488 | ||
489 | void nilfs_write_inode_common(struct inode *inode, | |
490 | struct nilfs_inode *raw_inode, int has_bmap) | |
491 | { | |
492 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
493 | ||
494 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); | |
495 | raw_inode->i_uid = cpu_to_le32(inode->i_uid); | |
496 | raw_inode->i_gid = cpu_to_le32(inode->i_gid); | |
497 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); | |
498 | raw_inode->i_size = cpu_to_le64(inode->i_size); | |
499 | raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); | |
500 | raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec); | |
61239230 RK |
501 | raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); |
502 | raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); | |
05fe58fd RK |
503 | raw_inode->i_blocks = cpu_to_le64(inode->i_blocks); |
504 | ||
05fe58fd RK |
505 | raw_inode->i_flags = cpu_to_le32(ii->i_flags); |
506 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); | |
507 | ||
508 | if (has_bmap) | |
509 | nilfs_bmap_write(ii->i_bmap, raw_inode); | |
510 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
511 | raw_inode->i_device_code = | |
512 | cpu_to_le64(new_encode_dev(inode->i_rdev)); | |
513 | /* When extending inode, nilfs->ns_inode_size should be checked | |
514 | for substitutions of appended fields */ | |
515 | } | |
516 | ||
517 | void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh) | |
518 | { | |
519 | ino_t ino = inode->i_ino; | |
520 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
521 | struct super_block *sb = inode->i_sb; | |
522 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
523 | struct nilfs_inode *raw_inode; | |
524 | ||
525 | raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, ibh); | |
526 | ||
527 | /* The buffer is guarded with lock_buffer() by the caller */ | |
528 | if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state)) | |
529 | memset(raw_inode, 0, NILFS_MDT(sbi->s_ifile)->mi_entry_size); | |
530 | set_bit(NILFS_I_INODE_DIRTY, &ii->i_state); | |
531 | ||
532 | nilfs_write_inode_common(inode, raw_inode, 0); | |
533 | /* XXX: call with has_bmap = 0 is a workaround to avoid | |
534 | deadlock of bmap. This delays update of i_bmap to just | |
535 | before writing */ | |
536 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, ibh); | |
537 | } | |
538 | ||
539 | #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */ | |
540 | ||
541 | static void nilfs_truncate_bmap(struct nilfs_inode_info *ii, | |
542 | unsigned long from) | |
543 | { | |
544 | unsigned long b; | |
545 | int ret; | |
546 | ||
547 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
548 | return; | |
549 | repeat: | |
550 | ret = nilfs_bmap_last_key(ii->i_bmap, &b); | |
551 | if (ret == -ENOENT) | |
552 | return; | |
553 | else if (ret < 0) | |
554 | goto failed; | |
555 | ||
556 | if (b < from) | |
557 | return; | |
558 | ||
559 | b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from); | |
560 | ret = nilfs_bmap_truncate(ii->i_bmap, b); | |
561 | nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb); | |
562 | if (!ret || (ret == -ENOMEM && | |
563 | nilfs_bmap_truncate(ii->i_bmap, b) == 0)) | |
564 | goto repeat; | |
565 | ||
566 | failed: | |
567 | if (ret == -EINVAL) | |
568 | nilfs_error(ii->vfs_inode.i_sb, __func__, | |
569 | "bmap is broken (ino=%lu)", ii->vfs_inode.i_ino); | |
570 | else | |
571 | nilfs_warning(ii->vfs_inode.i_sb, __func__, | |
572 | "failed to truncate bmap (ino=%lu, err=%d)", | |
573 | ii->vfs_inode.i_ino, ret); | |
574 | } | |
575 | ||
576 | void nilfs_truncate(struct inode *inode) | |
577 | { | |
578 | unsigned long blkoff; | |
579 | unsigned int blocksize; | |
580 | struct nilfs_transaction_info ti; | |
581 | struct super_block *sb = inode->i_sb; | |
582 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
05fe58fd RK |
583 | |
584 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
585 | return; | |
586 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
587 | return; | |
588 | ||
589 | blocksize = sb->s_blocksize; | |
590 | blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits; | |
1f5abe7e | 591 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
05fe58fd RK |
592 | |
593 | block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block); | |
594 | ||
595 | nilfs_truncate_bmap(ii, blkoff); | |
596 | ||
597 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
598 | if (IS_SYNC(inode)) | |
599 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
600 | ||
601 | nilfs_set_file_dirty(NILFS_SB(sb), inode, 0); | |
47420c79 | 602 | nilfs_transaction_commit(sb); |
05fe58fd RK |
603 | /* May construct a logical segment and may fail in sync mode. |
604 | But truncate has no return value. */ | |
605 | } | |
606 | ||
607 | void nilfs_delete_inode(struct inode *inode) | |
608 | { | |
609 | struct nilfs_transaction_info ti; | |
610 | struct super_block *sb = inode->i_sb; | |
611 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
05fe58fd RK |
612 | |
613 | if (unlikely(is_bad_inode(inode))) { | |
614 | if (inode->i_data.nrpages) | |
615 | truncate_inode_pages(&inode->i_data, 0); | |
616 | clear_inode(inode); | |
617 | return; | |
618 | } | |
1f5abe7e RK |
619 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
620 | ||
05fe58fd RK |
621 | if (inode->i_data.nrpages) |
622 | truncate_inode_pages(&inode->i_data, 0); | |
623 | ||
624 | nilfs_truncate_bmap(ii, 0); | |
625 | nilfs_free_inode(inode); | |
626 | /* nilfs_free_inode() marks inode buffer dirty */ | |
627 | if (IS_SYNC(inode)) | |
628 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
47420c79 | 629 | nilfs_transaction_commit(sb); |
05fe58fd RK |
630 | /* May construct a logical segment and may fail in sync mode. |
631 | But delete_inode has no return value. */ | |
632 | } | |
633 | ||
634 | int nilfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
635 | { | |
636 | struct nilfs_transaction_info ti; | |
637 | struct inode *inode = dentry->d_inode; | |
638 | struct super_block *sb = inode->i_sb; | |
47420c79 | 639 | int err; |
05fe58fd RK |
640 | |
641 | err = inode_change_ok(inode, iattr); | |
642 | if (err) | |
643 | return err; | |
644 | ||
645 | err = nilfs_transaction_begin(sb, &ti, 0); | |
646 | if (unlikely(err)) | |
647 | return err; | |
648 | err = inode_setattr(inode, iattr); | |
649 | if (!err && (iattr->ia_valid & ATTR_MODE)) | |
650 | err = nilfs_acl_chmod(inode); | |
47420c79 RK |
651 | if (likely(!err)) |
652 | err = nilfs_transaction_commit(sb); | |
653 | else | |
654 | nilfs_transaction_abort(sb); | |
655 | ||
656 | return err; | |
05fe58fd RK |
657 | } |
658 | ||
659 | int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode, | |
660 | struct buffer_head **pbh) | |
661 | { | |
662 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
663 | int err; | |
664 | ||
665 | spin_lock(&sbi->s_inode_lock); | |
666 | /* Caller of this function MUST lock s_inode_lock */ | |
667 | if (ii->i_bh == NULL) { | |
668 | spin_unlock(&sbi->s_inode_lock); | |
669 | err = nilfs_ifile_get_inode_block(sbi->s_ifile, inode->i_ino, | |
670 | pbh); | |
671 | if (unlikely(err)) | |
672 | return err; | |
673 | spin_lock(&sbi->s_inode_lock); | |
674 | if (ii->i_bh == NULL) | |
675 | ii->i_bh = *pbh; | |
676 | else { | |
677 | brelse(*pbh); | |
678 | *pbh = ii->i_bh; | |
679 | } | |
680 | } else | |
681 | *pbh = ii->i_bh; | |
682 | ||
683 | get_bh(*pbh); | |
684 | spin_unlock(&sbi->s_inode_lock); | |
685 | return 0; | |
686 | } | |
687 | ||
688 | int nilfs_inode_dirty(struct inode *inode) | |
689 | { | |
690 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
691 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
692 | int ret = 0; | |
693 | ||
694 | if (!list_empty(&ii->i_dirty)) { | |
695 | spin_lock(&sbi->s_inode_lock); | |
696 | ret = test_bit(NILFS_I_DIRTY, &ii->i_state) || | |
697 | test_bit(NILFS_I_BUSY, &ii->i_state); | |
698 | spin_unlock(&sbi->s_inode_lock); | |
699 | } | |
700 | return ret; | |
701 | } | |
702 | ||
703 | int nilfs_set_file_dirty(struct nilfs_sb_info *sbi, struct inode *inode, | |
704 | unsigned nr_dirty) | |
705 | { | |
706 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
707 | ||
708 | atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks); | |
709 | ||
458c5b08 | 710 | if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state)) |
05fe58fd RK |
711 | return 0; |
712 | ||
713 | spin_lock(&sbi->s_inode_lock); | |
714 | if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && | |
715 | !test_bit(NILFS_I_BUSY, &ii->i_state)) { | |
716 | /* Because this routine may race with nilfs_dispose_list(), | |
717 | we have to check NILFS_I_QUEUED here, too. */ | |
718 | if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) { | |
719 | /* This will happen when somebody is freeing | |
720 | this inode. */ | |
721 | nilfs_warning(sbi->s_super, __func__, | |
722 | "cannot get inode (ino=%lu)\n", | |
723 | inode->i_ino); | |
724 | spin_unlock(&sbi->s_inode_lock); | |
725 | return -EINVAL; /* NILFS_I_DIRTY may remain for | |
726 | freeing inode */ | |
727 | } | |
728 | list_del(&ii->i_dirty); | |
729 | list_add_tail(&ii->i_dirty, &sbi->s_dirty_files); | |
730 | set_bit(NILFS_I_QUEUED, &ii->i_state); | |
731 | } | |
732 | spin_unlock(&sbi->s_inode_lock); | |
733 | return 0; | |
734 | } | |
735 | ||
736 | int nilfs_mark_inode_dirty(struct inode *inode) | |
737 | { | |
738 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
739 | struct buffer_head *ibh; | |
740 | int err; | |
741 | ||
742 | err = nilfs_load_inode_block(sbi, inode, &ibh); | |
743 | if (unlikely(err)) { | |
744 | nilfs_warning(inode->i_sb, __func__, | |
745 | "failed to reget inode block.\n"); | |
746 | return err; | |
747 | } | |
748 | lock_buffer(ibh); | |
749 | nilfs_update_inode(inode, ibh); | |
750 | unlock_buffer(ibh); | |
751 | nilfs_mdt_mark_buffer_dirty(ibh); | |
752 | nilfs_mdt_mark_dirty(sbi->s_ifile); | |
753 | brelse(ibh); | |
754 | return 0; | |
755 | } | |
756 | ||
757 | /** | |
758 | * nilfs_dirty_inode - reflect changes on given inode to an inode block. | |
759 | * @inode: inode of the file to be registered. | |
760 | * | |
761 | * nilfs_dirty_inode() loads a inode block containing the specified | |
762 | * @inode and copies data from a nilfs_inode to a corresponding inode | |
763 | * entry in the inode block. This operation is excluded from the segment | |
764 | * construction. This function can be called both as a single operation | |
765 | * and as a part of indivisible file operations. | |
766 | */ | |
767 | void nilfs_dirty_inode(struct inode *inode) | |
768 | { | |
769 | struct nilfs_transaction_info ti; | |
770 | ||
771 | if (is_bad_inode(inode)) { | |
772 | nilfs_warning(inode->i_sb, __func__, | |
773 | "tried to mark bad_inode dirty. ignored.\n"); | |
774 | dump_stack(); | |
775 | return; | |
776 | } | |
777 | nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
458c5b08 | 778 | nilfs_mark_inode_dirty(inode); |
47420c79 | 779 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
05fe58fd | 780 | } |