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 RK |
311 | ii->i_dir_start_lookup = 0; |
312 | #ifdef CONFIG_NILFS_FS_POSIX_ACL | |
313 | ii->i_acl = NULL; | |
314 | ii->i_default_acl = NULL; | |
315 | #endif | |
316 | ii->i_cno = 0; | |
317 | nilfs_set_inode_flags(inode); | |
318 | spin_lock(&sbi->s_next_gen_lock); | |
319 | inode->i_generation = sbi->s_next_generation++; | |
320 | spin_unlock(&sbi->s_next_gen_lock); | |
321 | insert_inode_hash(inode); | |
322 | ||
323 | err = nilfs_init_acl(inode, dir); | |
324 | if (unlikely(err)) | |
325 | goto failed_acl; /* never occur. When supporting | |
326 | nilfs_init_acl(), proper cancellation of | |
327 | above jobs should be considered */ | |
328 | ||
329 | mark_inode_dirty(inode); | |
330 | return inode; | |
331 | ||
332 | failed_acl: | |
333 | failed_bmap: | |
334 | inode->i_nlink = 0; | |
335 | iput(inode); /* raw_inode will be deleted through | |
336 | generic_delete_inode() */ | |
337 | goto failed; | |
338 | ||
339 | failed_ifile_create_inode: | |
340 | make_bad_inode(inode); | |
341 | iput(inode); /* if i_nlink == 1, generic_forget_inode() will be | |
342 | called */ | |
343 | failed: | |
344 | return ERR_PTR(err); | |
345 | } | |
346 | ||
347 | void nilfs_free_inode(struct inode *inode) | |
348 | { | |
349 | struct super_block *sb = inode->i_sb; | |
350 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
351 | ||
352 | clear_inode(inode); | |
353 | /* XXX: check error code? Is there any thing I can do? */ | |
354 | (void) nilfs_ifile_delete_inode(sbi->s_ifile, inode->i_ino); | |
355 | atomic_dec(&sbi->s_inodes_count); | |
356 | } | |
357 | ||
358 | void nilfs_set_inode_flags(struct inode *inode) | |
359 | { | |
360 | unsigned int flags = NILFS_I(inode)->i_flags; | |
361 | ||
362 | inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | | |
363 | S_DIRSYNC); | |
364 | if (flags & NILFS_SYNC_FL) | |
365 | inode->i_flags |= S_SYNC; | |
366 | if (flags & NILFS_APPEND_FL) | |
367 | inode->i_flags |= S_APPEND; | |
368 | if (flags & NILFS_IMMUTABLE_FL) | |
369 | inode->i_flags |= S_IMMUTABLE; | |
370 | #ifndef NILFS_ATIME_DISABLE | |
371 | if (flags & NILFS_NOATIME_FL) | |
372 | #endif | |
373 | inode->i_flags |= S_NOATIME; | |
374 | if (flags & NILFS_DIRSYNC_FL) | |
375 | inode->i_flags |= S_DIRSYNC; | |
376 | mapping_set_gfp_mask(inode->i_mapping, | |
377 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
378 | } | |
379 | ||
380 | int nilfs_read_inode_common(struct inode *inode, | |
381 | struct nilfs_inode *raw_inode) | |
382 | { | |
383 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
384 | int err; | |
385 | ||
386 | inode->i_mode = le16_to_cpu(raw_inode->i_mode); | |
387 | inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid); | |
388 | inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid); | |
389 | inode->i_nlink = le16_to_cpu(raw_inode->i_links_count); | |
390 | inode->i_size = le64_to_cpu(raw_inode->i_size); | |
391 | inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime); | |
392 | inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime); | |
393 | inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime); | |
61239230 RK |
394 | inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); |
395 | inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec); | |
396 | inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); | |
397 | if (inode->i_nlink == 0 && inode->i_mode == 0) | |
05fe58fd RK |
398 | return -EINVAL; /* this inode is deleted */ |
399 | ||
400 | inode->i_blocks = le64_to_cpu(raw_inode->i_blocks); | |
401 | ii->i_flags = le32_to_cpu(raw_inode->i_flags); | |
402 | #if 0 | |
403 | ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl); | |
404 | ii->i_dir_acl = S_ISREG(inode->i_mode) ? | |
405 | 0 : le32_to_cpu(raw_inode->i_dir_acl); | |
406 | #endif | |
407 | ii->i_cno = 0; | |
408 | inode->i_generation = le32_to_cpu(raw_inode->i_generation); | |
409 | ||
410 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
411 | S_ISLNK(inode->i_mode)) { | |
412 | err = nilfs_bmap_read(ii->i_bmap, raw_inode); | |
413 | if (err < 0) | |
414 | return err; | |
415 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
416 | /* No lock is needed; iget() ensures it. */ | |
417 | } | |
418 | return 0; | |
419 | } | |
420 | ||
05fe58fd RK |
421 | static int __nilfs_read_inode(struct super_block *sb, unsigned long ino, |
422 | struct inode *inode) | |
423 | { | |
424 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
425 | struct inode *dat = nilfs_dat_inode(sbi->s_nilfs); | |
426 | struct buffer_head *bh; | |
427 | struct nilfs_inode *raw_inode; | |
428 | int err; | |
429 | ||
430 | down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
431 | err = nilfs_ifile_get_inode_block(sbi->s_ifile, ino, &bh); | |
432 | if (unlikely(err)) | |
433 | goto bad_inode; | |
434 | ||
435 | raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, bh); | |
436 | ||
437 | #ifdef CONFIG_NILFS_FS_POSIX_ACL | |
438 | ii->i_acl = NILFS_ACL_NOT_CACHED; | |
439 | ii->i_default_acl = NILFS_ACL_NOT_CACHED; | |
440 | #endif | |
441 | if (nilfs_read_inode_common(inode, raw_inode)) | |
442 | goto failed_unmap; | |
443 | ||
444 | if (S_ISREG(inode->i_mode)) { | |
445 | inode->i_op = &nilfs_file_inode_operations; | |
446 | inode->i_fop = &nilfs_file_operations; | |
447 | inode->i_mapping->a_ops = &nilfs_aops; | |
05fe58fd RK |
448 | } else if (S_ISDIR(inode->i_mode)) { |
449 | inode->i_op = &nilfs_dir_inode_operations; | |
450 | inode->i_fop = &nilfs_dir_operations; | |
451 | inode->i_mapping->a_ops = &nilfs_aops; | |
452 | } else if (S_ISLNK(inode->i_mode)) { | |
453 | inode->i_op = &nilfs_symlink_inode_operations; | |
454 | inode->i_mapping->a_ops = &nilfs_aops; | |
455 | } else { | |
456 | inode->i_op = &nilfs_special_inode_operations; | |
457 | init_special_inode( | |
458 | inode, inode->i_mode, | |
459 | new_decode_dev(le64_to_cpu(raw_inode->i_device_code))); | |
460 | } | |
461 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh); | |
462 | brelse(bh); | |
463 | up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
464 | nilfs_set_inode_flags(inode); | |
465 | return 0; | |
466 | ||
467 | failed_unmap: | |
468 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh); | |
469 | brelse(bh); | |
470 | ||
471 | bad_inode: | |
472 | up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
473 | return err; | |
474 | } | |
475 | ||
476 | struct inode *nilfs_iget(struct super_block *sb, unsigned long ino) | |
477 | { | |
478 | struct inode *inode; | |
479 | int err; | |
480 | ||
481 | inode = iget_locked(sb, ino); | |
482 | if (unlikely(!inode)) | |
483 | return ERR_PTR(-ENOMEM); | |
484 | if (!(inode->i_state & I_NEW)) | |
485 | return inode; | |
486 | ||
487 | err = __nilfs_read_inode(sb, ino, inode); | |
488 | if (unlikely(err)) { | |
489 | iget_failed(inode); | |
490 | return ERR_PTR(err); | |
491 | } | |
492 | unlock_new_inode(inode); | |
493 | return inode; | |
494 | } | |
495 | ||
496 | void nilfs_write_inode_common(struct inode *inode, | |
497 | struct nilfs_inode *raw_inode, int has_bmap) | |
498 | { | |
499 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
500 | ||
501 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); | |
502 | raw_inode->i_uid = cpu_to_le32(inode->i_uid); | |
503 | raw_inode->i_gid = cpu_to_le32(inode->i_gid); | |
504 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); | |
505 | raw_inode->i_size = cpu_to_le64(inode->i_size); | |
506 | raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); | |
507 | raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec); | |
61239230 RK |
508 | raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); |
509 | raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); | |
05fe58fd RK |
510 | raw_inode->i_blocks = cpu_to_le64(inode->i_blocks); |
511 | ||
05fe58fd RK |
512 | raw_inode->i_flags = cpu_to_le32(ii->i_flags); |
513 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); | |
514 | ||
515 | if (has_bmap) | |
516 | nilfs_bmap_write(ii->i_bmap, raw_inode); | |
517 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
518 | raw_inode->i_device_code = | |
519 | cpu_to_le64(new_encode_dev(inode->i_rdev)); | |
520 | /* When extending inode, nilfs->ns_inode_size should be checked | |
521 | for substitutions of appended fields */ | |
522 | } | |
523 | ||
524 | void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh) | |
525 | { | |
526 | ino_t ino = inode->i_ino; | |
527 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
528 | struct super_block *sb = inode->i_sb; | |
529 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
530 | struct nilfs_inode *raw_inode; | |
531 | ||
532 | raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, ibh); | |
533 | ||
534 | /* The buffer is guarded with lock_buffer() by the caller */ | |
535 | if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state)) | |
536 | memset(raw_inode, 0, NILFS_MDT(sbi->s_ifile)->mi_entry_size); | |
537 | set_bit(NILFS_I_INODE_DIRTY, &ii->i_state); | |
538 | ||
539 | nilfs_write_inode_common(inode, raw_inode, 0); | |
540 | /* XXX: call with has_bmap = 0 is a workaround to avoid | |
541 | deadlock of bmap. This delays update of i_bmap to just | |
542 | before writing */ | |
543 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, ibh); | |
544 | } | |
545 | ||
546 | #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */ | |
547 | ||
548 | static void nilfs_truncate_bmap(struct nilfs_inode_info *ii, | |
549 | unsigned long from) | |
550 | { | |
551 | unsigned long b; | |
552 | int ret; | |
553 | ||
554 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
555 | return; | |
556 | repeat: | |
557 | ret = nilfs_bmap_last_key(ii->i_bmap, &b); | |
558 | if (ret == -ENOENT) | |
559 | return; | |
560 | else if (ret < 0) | |
561 | goto failed; | |
562 | ||
563 | if (b < from) | |
564 | return; | |
565 | ||
566 | b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from); | |
567 | ret = nilfs_bmap_truncate(ii->i_bmap, b); | |
568 | nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb); | |
569 | if (!ret || (ret == -ENOMEM && | |
570 | nilfs_bmap_truncate(ii->i_bmap, b) == 0)) | |
571 | goto repeat; | |
572 | ||
573 | failed: | |
574 | if (ret == -EINVAL) | |
575 | nilfs_error(ii->vfs_inode.i_sb, __func__, | |
576 | "bmap is broken (ino=%lu)", ii->vfs_inode.i_ino); | |
577 | else | |
578 | nilfs_warning(ii->vfs_inode.i_sb, __func__, | |
579 | "failed to truncate bmap (ino=%lu, err=%d)", | |
580 | ii->vfs_inode.i_ino, ret); | |
581 | } | |
582 | ||
583 | void nilfs_truncate(struct inode *inode) | |
584 | { | |
585 | unsigned long blkoff; | |
586 | unsigned int blocksize; | |
587 | struct nilfs_transaction_info ti; | |
588 | struct super_block *sb = inode->i_sb; | |
589 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
05fe58fd RK |
590 | |
591 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
592 | return; | |
593 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
594 | return; | |
595 | ||
596 | blocksize = sb->s_blocksize; | |
597 | blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits; | |
1f5abe7e | 598 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
05fe58fd RK |
599 | |
600 | block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block); | |
601 | ||
602 | nilfs_truncate_bmap(ii, blkoff); | |
603 | ||
604 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
605 | if (IS_SYNC(inode)) | |
606 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
607 | ||
608 | nilfs_set_file_dirty(NILFS_SB(sb), inode, 0); | |
47420c79 | 609 | nilfs_transaction_commit(sb); |
05fe58fd RK |
610 | /* May construct a logical segment and may fail in sync mode. |
611 | But truncate has no return value. */ | |
612 | } | |
613 | ||
614 | void nilfs_delete_inode(struct inode *inode) | |
615 | { | |
616 | struct nilfs_transaction_info ti; | |
617 | struct super_block *sb = inode->i_sb; | |
618 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
05fe58fd RK |
619 | |
620 | if (unlikely(is_bad_inode(inode))) { | |
621 | if (inode->i_data.nrpages) | |
622 | truncate_inode_pages(&inode->i_data, 0); | |
623 | clear_inode(inode); | |
624 | return; | |
625 | } | |
1f5abe7e RK |
626 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
627 | ||
05fe58fd RK |
628 | if (inode->i_data.nrpages) |
629 | truncate_inode_pages(&inode->i_data, 0); | |
630 | ||
631 | nilfs_truncate_bmap(ii, 0); | |
632 | nilfs_free_inode(inode); | |
633 | /* nilfs_free_inode() marks inode buffer dirty */ | |
634 | if (IS_SYNC(inode)) | |
635 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
47420c79 | 636 | nilfs_transaction_commit(sb); |
05fe58fd RK |
637 | /* May construct a logical segment and may fail in sync mode. |
638 | But delete_inode has no return value. */ | |
639 | } | |
640 | ||
641 | int nilfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
642 | { | |
643 | struct nilfs_transaction_info ti; | |
644 | struct inode *inode = dentry->d_inode; | |
645 | struct super_block *sb = inode->i_sb; | |
47420c79 | 646 | int err; |
05fe58fd RK |
647 | |
648 | err = inode_change_ok(inode, iattr); | |
649 | if (err) | |
650 | return err; | |
651 | ||
652 | err = nilfs_transaction_begin(sb, &ti, 0); | |
653 | if (unlikely(err)) | |
654 | return err; | |
655 | err = inode_setattr(inode, iattr); | |
656 | if (!err && (iattr->ia_valid & ATTR_MODE)) | |
657 | err = nilfs_acl_chmod(inode); | |
47420c79 RK |
658 | if (likely(!err)) |
659 | err = nilfs_transaction_commit(sb); | |
660 | else | |
661 | nilfs_transaction_abort(sb); | |
662 | ||
663 | return err; | |
05fe58fd RK |
664 | } |
665 | ||
666 | int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode, | |
667 | struct buffer_head **pbh) | |
668 | { | |
669 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
670 | int err; | |
671 | ||
672 | spin_lock(&sbi->s_inode_lock); | |
673 | /* Caller of this function MUST lock s_inode_lock */ | |
674 | if (ii->i_bh == NULL) { | |
675 | spin_unlock(&sbi->s_inode_lock); | |
676 | err = nilfs_ifile_get_inode_block(sbi->s_ifile, inode->i_ino, | |
677 | pbh); | |
678 | if (unlikely(err)) | |
679 | return err; | |
680 | spin_lock(&sbi->s_inode_lock); | |
681 | if (ii->i_bh == NULL) | |
682 | ii->i_bh = *pbh; | |
683 | else { | |
684 | brelse(*pbh); | |
685 | *pbh = ii->i_bh; | |
686 | } | |
687 | } else | |
688 | *pbh = ii->i_bh; | |
689 | ||
690 | get_bh(*pbh); | |
691 | spin_unlock(&sbi->s_inode_lock); | |
692 | return 0; | |
693 | } | |
694 | ||
695 | int nilfs_inode_dirty(struct inode *inode) | |
696 | { | |
697 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
698 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
699 | int ret = 0; | |
700 | ||
701 | if (!list_empty(&ii->i_dirty)) { | |
702 | spin_lock(&sbi->s_inode_lock); | |
703 | ret = test_bit(NILFS_I_DIRTY, &ii->i_state) || | |
704 | test_bit(NILFS_I_BUSY, &ii->i_state); | |
705 | spin_unlock(&sbi->s_inode_lock); | |
706 | } | |
707 | return ret; | |
708 | } | |
709 | ||
710 | int nilfs_set_file_dirty(struct nilfs_sb_info *sbi, struct inode *inode, | |
711 | unsigned nr_dirty) | |
712 | { | |
713 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
714 | ||
715 | atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks); | |
716 | ||
458c5b08 | 717 | if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state)) |
05fe58fd RK |
718 | return 0; |
719 | ||
720 | spin_lock(&sbi->s_inode_lock); | |
721 | if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && | |
722 | !test_bit(NILFS_I_BUSY, &ii->i_state)) { | |
723 | /* Because this routine may race with nilfs_dispose_list(), | |
724 | we have to check NILFS_I_QUEUED here, too. */ | |
725 | if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) { | |
726 | /* This will happen when somebody is freeing | |
727 | this inode. */ | |
728 | nilfs_warning(sbi->s_super, __func__, | |
729 | "cannot get inode (ino=%lu)\n", | |
730 | inode->i_ino); | |
731 | spin_unlock(&sbi->s_inode_lock); | |
732 | return -EINVAL; /* NILFS_I_DIRTY may remain for | |
733 | freeing inode */ | |
734 | } | |
735 | list_del(&ii->i_dirty); | |
736 | list_add_tail(&ii->i_dirty, &sbi->s_dirty_files); | |
737 | set_bit(NILFS_I_QUEUED, &ii->i_state); | |
738 | } | |
739 | spin_unlock(&sbi->s_inode_lock); | |
740 | return 0; | |
741 | } | |
742 | ||
743 | int nilfs_mark_inode_dirty(struct inode *inode) | |
744 | { | |
745 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
746 | struct buffer_head *ibh; | |
747 | int err; | |
748 | ||
749 | err = nilfs_load_inode_block(sbi, inode, &ibh); | |
750 | if (unlikely(err)) { | |
751 | nilfs_warning(inode->i_sb, __func__, | |
752 | "failed to reget inode block.\n"); | |
753 | return err; | |
754 | } | |
755 | lock_buffer(ibh); | |
756 | nilfs_update_inode(inode, ibh); | |
757 | unlock_buffer(ibh); | |
758 | nilfs_mdt_mark_buffer_dirty(ibh); | |
759 | nilfs_mdt_mark_dirty(sbi->s_ifile); | |
760 | brelse(ibh); | |
761 | return 0; | |
762 | } | |
763 | ||
764 | /** | |
765 | * nilfs_dirty_inode - reflect changes on given inode to an inode block. | |
766 | * @inode: inode of the file to be registered. | |
767 | * | |
768 | * nilfs_dirty_inode() loads a inode block containing the specified | |
769 | * @inode and copies data from a nilfs_inode to a corresponding inode | |
770 | * entry in the inode block. This operation is excluded from the segment | |
771 | * construction. This function can be called both as a single operation | |
772 | * and as a part of indivisible file operations. | |
773 | */ | |
774 | void nilfs_dirty_inode(struct inode *inode) | |
775 | { | |
776 | struct nilfs_transaction_info ti; | |
777 | ||
778 | if (is_bad_inode(inode)) { | |
779 | nilfs_warning(inode->i_sb, __func__, | |
780 | "tried to mark bad_inode dirty. ignored.\n"); | |
781 | dump_stack(); | |
782 | return; | |
783 | } | |
784 | nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
458c5b08 | 785 | nilfs_mark_inode_dirty(inode); |
47420c79 | 786 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
05fe58fd | 787 | } |