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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 | } | |
abdb318b | 100 | nilfs_mark_inode_dirty(inode); |
47420c79 | 101 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
05fe58fd RK |
102 | /* Error handling should be detailed */ |
103 | set_buffer_new(bh_result); | |
104 | map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed | |
105 | to proper value */ | |
106 | } else if (ret == -ENOENT) { | |
107 | /* not found is not error (e.g. hole); must return without | |
108 | the mapped state flag. */ | |
109 | ; | |
110 | } else { | |
111 | err = ret; | |
112 | } | |
113 | ||
114 | out: | |
115 | return err; | |
116 | } | |
117 | ||
118 | /** | |
119 | * nilfs_readpage() - implement readpage() method of nilfs_aops {} | |
120 | * address_space_operations. | |
121 | * @file - file struct of the file to be read | |
122 | * @page - the page to be read | |
123 | */ | |
124 | static int nilfs_readpage(struct file *file, struct page *page) | |
125 | { | |
126 | return mpage_readpage(page, nilfs_get_block); | |
127 | } | |
128 | ||
129 | /** | |
130 | * nilfs_readpages() - implement readpages() method of nilfs_aops {} | |
131 | * address_space_operations. | |
132 | * @file - file struct of the file to be read | |
133 | * @mapping - address_space struct used for reading multiple pages | |
134 | * @pages - the pages to be read | |
135 | * @nr_pages - number of pages to be read | |
136 | */ | |
137 | static int nilfs_readpages(struct file *file, struct address_space *mapping, | |
138 | struct list_head *pages, unsigned nr_pages) | |
139 | { | |
140 | return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block); | |
141 | } | |
142 | ||
143 | static int nilfs_writepages(struct address_space *mapping, | |
144 | struct writeback_control *wbc) | |
145 | { | |
f30bf3e4 RK |
146 | struct inode *inode = mapping->host; |
147 | int err = 0; | |
148 | ||
149 | if (wbc->sync_mode == WB_SYNC_ALL) | |
150 | err = nilfs_construct_dsync_segment(inode->i_sb, inode, | |
151 | wbc->range_start, | |
152 | wbc->range_end); | |
153 | return err; | |
05fe58fd RK |
154 | } |
155 | ||
156 | static int nilfs_writepage(struct page *page, struct writeback_control *wbc) | |
157 | { | |
158 | struct inode *inode = page->mapping->host; | |
159 | int err; | |
160 | ||
161 | redirty_page_for_writepage(wbc, page); | |
162 | unlock_page(page); | |
163 | ||
164 | if (wbc->sync_mode == WB_SYNC_ALL) { | |
165 | err = nilfs_construct_segment(inode->i_sb); | |
166 | if (unlikely(err)) | |
167 | return err; | |
168 | } else if (wbc->for_reclaim) | |
169 | nilfs_flush_segment(inode->i_sb, inode->i_ino); | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | static int nilfs_set_page_dirty(struct page *page) | |
175 | { | |
176 | int ret = __set_page_dirty_buffers(page); | |
177 | ||
178 | if (ret) { | |
179 | struct inode *inode = page->mapping->host; | |
180 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
181 | unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits); | |
182 | ||
183 | nilfs_set_file_dirty(sbi, inode, nr_dirty); | |
184 | } | |
185 | return ret; | |
186 | } | |
187 | ||
188 | static int nilfs_write_begin(struct file *file, struct address_space *mapping, | |
189 | loff_t pos, unsigned len, unsigned flags, | |
190 | struct page **pagep, void **fsdata) | |
191 | ||
192 | { | |
193 | struct inode *inode = mapping->host; | |
194 | int err = nilfs_transaction_begin(inode->i_sb, NULL, 1); | |
195 | ||
196 | if (unlikely(err)) | |
197 | return err; | |
198 | ||
199 | *pagep = NULL; | |
200 | err = block_write_begin(file, mapping, pos, len, flags, pagep, | |
201 | fsdata, nilfs_get_block); | |
202 | if (unlikely(err)) | |
47420c79 | 203 | nilfs_transaction_abort(inode->i_sb); |
05fe58fd RK |
204 | return err; |
205 | } | |
206 | ||
207 | static int nilfs_write_end(struct file *file, struct address_space *mapping, | |
208 | loff_t pos, unsigned len, unsigned copied, | |
209 | struct page *page, void *fsdata) | |
210 | { | |
211 | struct inode *inode = mapping->host; | |
212 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
213 | unsigned nr_dirty; | |
214 | int err; | |
215 | ||
216 | nr_dirty = nilfs_page_count_clean_buffers(page, start, | |
217 | start + copied); | |
218 | copied = generic_write_end(file, mapping, pos, len, copied, page, | |
219 | fsdata); | |
220 | nilfs_set_file_dirty(NILFS_SB(inode->i_sb), inode, nr_dirty); | |
47420c79 | 221 | err = nilfs_transaction_commit(inode->i_sb); |
05fe58fd RK |
222 | return err ? : copied; |
223 | } | |
224 | ||
225 | static ssize_t | |
226 | nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, | |
227 | loff_t offset, unsigned long nr_segs) | |
228 | { | |
229 | struct file *file = iocb->ki_filp; | |
230 | struct inode *inode = file->f_mapping->host; | |
231 | ssize_t size; | |
05fe58fd RK |
232 | |
233 | if (rw == WRITE) | |
234 | return 0; | |
235 | ||
236 | /* Needs synchronization with the cleaner */ | |
237 | size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
238 | offset, nr_segs, nilfs_get_block, NULL); | |
239 | return size; | |
240 | } | |
241 | ||
7f09410b | 242 | const struct address_space_operations nilfs_aops = { |
05fe58fd RK |
243 | .writepage = nilfs_writepage, |
244 | .readpage = nilfs_readpage, | |
e85dc1d5 | 245 | .sync_page = block_sync_page, |
05fe58fd RK |
246 | .writepages = nilfs_writepages, |
247 | .set_page_dirty = nilfs_set_page_dirty, | |
248 | .readpages = nilfs_readpages, | |
249 | .write_begin = nilfs_write_begin, | |
250 | .write_end = nilfs_write_end, | |
251 | /* .releasepage = nilfs_releasepage, */ | |
252 | .invalidatepage = block_invalidatepage, | |
253 | .direct_IO = nilfs_direct_IO, | |
258ef67e | 254 | .is_partially_uptodate = block_is_partially_uptodate, |
05fe58fd RK |
255 | }; |
256 | ||
257 | struct inode *nilfs_new_inode(struct inode *dir, int mode) | |
258 | { | |
259 | struct super_block *sb = dir->i_sb; | |
260 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
261 | struct inode *inode; | |
262 | struct nilfs_inode_info *ii; | |
263 | int err = -ENOMEM; | |
264 | ino_t ino; | |
265 | ||
266 | inode = new_inode(sb); | |
267 | if (unlikely(!inode)) | |
268 | goto failed; | |
269 | ||
270 | mapping_set_gfp_mask(inode->i_mapping, | |
271 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
272 | ||
273 | ii = NILFS_I(inode); | |
274 | ii->i_state = 1 << NILFS_I_NEW; | |
275 | ||
276 | err = nilfs_ifile_create_inode(sbi->s_ifile, &ino, &ii->i_bh); | |
277 | if (unlikely(err)) | |
278 | goto failed_ifile_create_inode; | |
279 | /* reference count of i_bh inherits from nilfs_mdt_read_block() */ | |
280 | ||
281 | atomic_inc(&sbi->s_inodes_count); | |
282 | ||
283 | inode->i_uid = current_fsuid(); | |
284 | if (dir->i_mode & S_ISGID) { | |
285 | inode->i_gid = dir->i_gid; | |
286 | if (S_ISDIR(mode)) | |
287 | mode |= S_ISGID; | |
288 | } else | |
289 | inode->i_gid = current_fsgid(); | |
290 | ||
291 | inode->i_mode = mode; | |
292 | inode->i_ino = ino; | |
293 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
294 | ||
295 | if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { | |
296 | err = nilfs_bmap_read(ii->i_bmap, NULL); | |
297 | if (err < 0) | |
298 | goto failed_bmap; | |
299 | ||
300 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
301 | /* No lock is needed; iget() ensures it. */ | |
302 | } | |
303 | ||
304 | ii->i_flags = NILFS_I(dir)->i_flags; | |
305 | if (S_ISLNK(mode)) | |
306 | ii->i_flags &= ~(NILFS_IMMUTABLE_FL | NILFS_APPEND_FL); | |
307 | if (!S_ISDIR(mode)) | |
308 | ii->i_flags &= ~NILFS_DIRSYNC_FL; | |
309 | ||
310 | /* ii->i_file_acl = 0; */ | |
311 | /* ii->i_dir_acl = 0; */ | |
05fe58fd | 312 | ii->i_dir_start_lookup = 0; |
05fe58fd RK |
313 | ii->i_cno = 0; |
314 | nilfs_set_inode_flags(inode); | |
315 | spin_lock(&sbi->s_next_gen_lock); | |
316 | inode->i_generation = sbi->s_next_generation++; | |
317 | spin_unlock(&sbi->s_next_gen_lock); | |
318 | insert_inode_hash(inode); | |
319 | ||
320 | err = nilfs_init_acl(inode, dir); | |
321 | if (unlikely(err)) | |
322 | goto failed_acl; /* never occur. When supporting | |
323 | nilfs_init_acl(), proper cancellation of | |
324 | above jobs should be considered */ | |
325 | ||
05fe58fd RK |
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 | |
3cc811bf | 403 | ii->i_dir_start_lookup = 0; |
05fe58fd RK |
404 | ii->i_cno = 0; |
405 | inode->i_generation = le32_to_cpu(raw_inode->i_generation); | |
406 | ||
407 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
408 | S_ISLNK(inode->i_mode)) { | |
409 | err = nilfs_bmap_read(ii->i_bmap, raw_inode); | |
410 | if (err < 0) | |
411 | return err; | |
412 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
413 | /* No lock is needed; iget() ensures it. */ | |
414 | } | |
415 | return 0; | |
416 | } | |
417 | ||
05fe58fd RK |
418 | static int __nilfs_read_inode(struct super_block *sb, unsigned long ino, |
419 | struct inode *inode) | |
420 | { | |
421 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
422 | struct inode *dat = nilfs_dat_inode(sbi->s_nilfs); | |
423 | struct buffer_head *bh; | |
424 | struct nilfs_inode *raw_inode; | |
425 | int err; | |
426 | ||
427 | down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
428 | err = nilfs_ifile_get_inode_block(sbi->s_ifile, ino, &bh); | |
429 | if (unlikely(err)) | |
430 | goto bad_inode; | |
431 | ||
432 | raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, bh); | |
433 | ||
1b2f5a64 RK |
434 | err = nilfs_read_inode_common(inode, raw_inode); |
435 | if (err) | |
05fe58fd RK |
436 | goto failed_unmap; |
437 | ||
438 | if (S_ISREG(inode->i_mode)) { | |
439 | inode->i_op = &nilfs_file_inode_operations; | |
440 | inode->i_fop = &nilfs_file_operations; | |
441 | inode->i_mapping->a_ops = &nilfs_aops; | |
05fe58fd RK |
442 | } else if (S_ISDIR(inode->i_mode)) { |
443 | inode->i_op = &nilfs_dir_inode_operations; | |
444 | inode->i_fop = &nilfs_dir_operations; | |
445 | inode->i_mapping->a_ops = &nilfs_aops; | |
446 | } else if (S_ISLNK(inode->i_mode)) { | |
447 | inode->i_op = &nilfs_symlink_inode_operations; | |
448 | inode->i_mapping->a_ops = &nilfs_aops; | |
449 | } else { | |
450 | inode->i_op = &nilfs_special_inode_operations; | |
451 | init_special_inode( | |
452 | inode, inode->i_mode, | |
453 | new_decode_dev(le64_to_cpu(raw_inode->i_device_code))); | |
454 | } | |
455 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh); | |
456 | brelse(bh); | |
457 | up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
458 | nilfs_set_inode_flags(inode); | |
459 | return 0; | |
460 | ||
461 | failed_unmap: | |
462 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh); | |
463 | brelse(bh); | |
464 | ||
465 | bad_inode: | |
466 | up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
467 | return err; | |
468 | } | |
469 | ||
470 | struct inode *nilfs_iget(struct super_block *sb, unsigned long ino) | |
471 | { | |
472 | struct inode *inode; | |
473 | int err; | |
474 | ||
475 | inode = iget_locked(sb, ino); | |
476 | if (unlikely(!inode)) | |
477 | return ERR_PTR(-ENOMEM); | |
478 | if (!(inode->i_state & I_NEW)) | |
479 | return inode; | |
480 | ||
481 | err = __nilfs_read_inode(sb, ino, inode); | |
482 | if (unlikely(err)) { | |
483 | iget_failed(inode); | |
484 | return ERR_PTR(err); | |
485 | } | |
486 | unlock_new_inode(inode); | |
487 | return inode; | |
488 | } | |
489 | ||
490 | void nilfs_write_inode_common(struct inode *inode, | |
491 | struct nilfs_inode *raw_inode, int has_bmap) | |
492 | { | |
493 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
494 | ||
495 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); | |
496 | raw_inode->i_uid = cpu_to_le32(inode->i_uid); | |
497 | raw_inode->i_gid = cpu_to_le32(inode->i_gid); | |
498 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); | |
499 | raw_inode->i_size = cpu_to_le64(inode->i_size); | |
500 | raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); | |
501 | raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec); | |
61239230 RK |
502 | raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); |
503 | raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); | |
05fe58fd RK |
504 | raw_inode->i_blocks = cpu_to_le64(inode->i_blocks); |
505 | ||
05fe58fd RK |
506 | raw_inode->i_flags = cpu_to_le32(ii->i_flags); |
507 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); | |
508 | ||
509 | if (has_bmap) | |
510 | nilfs_bmap_write(ii->i_bmap, raw_inode); | |
511 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
512 | raw_inode->i_device_code = | |
513 | cpu_to_le64(new_encode_dev(inode->i_rdev)); | |
514 | /* When extending inode, nilfs->ns_inode_size should be checked | |
515 | for substitutions of appended fields */ | |
516 | } | |
517 | ||
518 | void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh) | |
519 | { | |
520 | ino_t ino = inode->i_ino; | |
521 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
522 | struct super_block *sb = inode->i_sb; | |
523 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
524 | struct nilfs_inode *raw_inode; | |
525 | ||
526 | raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, ibh); | |
527 | ||
05fe58fd RK |
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 | ||
abdb318b | 601 | nilfs_mark_inode_dirty(inode); |
05fe58fd | 602 | nilfs_set_file_dirty(NILFS_SB(sb), inode, 0); |
47420c79 | 603 | nilfs_transaction_commit(sb); |
05fe58fd RK |
604 | /* May construct a logical segment and may fail in sync mode. |
605 | But truncate has no return value. */ | |
606 | } | |
607 | ||
608 | void nilfs_delete_inode(struct inode *inode) | |
609 | { | |
610 | struct nilfs_transaction_info ti; | |
611 | struct super_block *sb = inode->i_sb; | |
612 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
05fe58fd RK |
613 | |
614 | if (unlikely(is_bad_inode(inode))) { | |
615 | if (inode->i_data.nrpages) | |
616 | truncate_inode_pages(&inode->i_data, 0); | |
617 | clear_inode(inode); | |
618 | return; | |
619 | } | |
1f5abe7e RK |
620 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
621 | ||
05fe58fd RK |
622 | if (inode->i_data.nrpages) |
623 | truncate_inode_pages(&inode->i_data, 0); | |
624 | ||
625 | nilfs_truncate_bmap(ii, 0); | |
abdb318b | 626 | nilfs_mark_inode_dirty(inode); |
05fe58fd RK |
627 | nilfs_free_inode(inode); |
628 | /* nilfs_free_inode() marks inode buffer dirty */ | |
629 | if (IS_SYNC(inode)) | |
630 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
47420c79 | 631 | nilfs_transaction_commit(sb); |
05fe58fd RK |
632 | /* May construct a logical segment and may fail in sync mode. |
633 | But delete_inode has no return value. */ | |
634 | } | |
635 | ||
636 | int nilfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
637 | { | |
638 | struct nilfs_transaction_info ti; | |
639 | struct inode *inode = dentry->d_inode; | |
640 | struct super_block *sb = inode->i_sb; | |
47420c79 | 641 | int err; |
05fe58fd RK |
642 | |
643 | err = inode_change_ok(inode, iattr); | |
644 | if (err) | |
645 | return err; | |
646 | ||
647 | err = nilfs_transaction_begin(sb, &ti, 0); | |
648 | if (unlikely(err)) | |
649 | return err; | |
650 | err = inode_setattr(inode, iattr); | |
651 | if (!err && (iattr->ia_valid & ATTR_MODE)) | |
652 | err = nilfs_acl_chmod(inode); | |
47420c79 RK |
653 | if (likely(!err)) |
654 | err = nilfs_transaction_commit(sb); | |
655 | else | |
656 | nilfs_transaction_abort(sb); | |
657 | ||
658 | return err; | |
05fe58fd RK |
659 | } |
660 | ||
661 | int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode, | |
662 | struct buffer_head **pbh) | |
663 | { | |
664 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
665 | int err; | |
666 | ||
667 | spin_lock(&sbi->s_inode_lock); | |
05fe58fd RK |
668 | if (ii->i_bh == NULL) { |
669 | spin_unlock(&sbi->s_inode_lock); | |
670 | err = nilfs_ifile_get_inode_block(sbi->s_ifile, inode->i_ino, | |
671 | pbh); | |
672 | if (unlikely(err)) | |
673 | return err; | |
674 | spin_lock(&sbi->s_inode_lock); | |
675 | if (ii->i_bh == NULL) | |
676 | ii->i_bh = *pbh; | |
677 | else { | |
678 | brelse(*pbh); | |
679 | *pbh = ii->i_bh; | |
680 | } | |
681 | } else | |
682 | *pbh = ii->i_bh; | |
683 | ||
684 | get_bh(*pbh); | |
685 | spin_unlock(&sbi->s_inode_lock); | |
686 | return 0; | |
687 | } | |
688 | ||
689 | int nilfs_inode_dirty(struct inode *inode) | |
690 | { | |
691 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
692 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
693 | int ret = 0; | |
694 | ||
695 | if (!list_empty(&ii->i_dirty)) { | |
696 | spin_lock(&sbi->s_inode_lock); | |
697 | ret = test_bit(NILFS_I_DIRTY, &ii->i_state) || | |
698 | test_bit(NILFS_I_BUSY, &ii->i_state); | |
699 | spin_unlock(&sbi->s_inode_lock); | |
700 | } | |
701 | return ret; | |
702 | } | |
703 | ||
704 | int nilfs_set_file_dirty(struct nilfs_sb_info *sbi, struct inode *inode, | |
705 | unsigned nr_dirty) | |
706 | { | |
707 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
708 | ||
709 | atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks); | |
710 | ||
458c5b08 | 711 | if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state)) |
05fe58fd RK |
712 | return 0; |
713 | ||
714 | spin_lock(&sbi->s_inode_lock); | |
715 | if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && | |
716 | !test_bit(NILFS_I_BUSY, &ii->i_state)) { | |
717 | /* Because this routine may race with nilfs_dispose_list(), | |
718 | we have to check NILFS_I_QUEUED here, too. */ | |
719 | if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) { | |
720 | /* This will happen when somebody is freeing | |
721 | this inode. */ | |
722 | nilfs_warning(sbi->s_super, __func__, | |
723 | "cannot get inode (ino=%lu)\n", | |
724 | inode->i_ino); | |
725 | spin_unlock(&sbi->s_inode_lock); | |
726 | return -EINVAL; /* NILFS_I_DIRTY may remain for | |
727 | freeing inode */ | |
728 | } | |
729 | list_del(&ii->i_dirty); | |
730 | list_add_tail(&ii->i_dirty, &sbi->s_dirty_files); | |
731 | set_bit(NILFS_I_QUEUED, &ii->i_state); | |
732 | } | |
733 | spin_unlock(&sbi->s_inode_lock); | |
734 | return 0; | |
735 | } | |
736 | ||
737 | int nilfs_mark_inode_dirty(struct inode *inode) | |
738 | { | |
739 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
740 | struct buffer_head *ibh; | |
741 | int err; | |
742 | ||
743 | err = nilfs_load_inode_block(sbi, inode, &ibh); | |
744 | if (unlikely(err)) { | |
745 | nilfs_warning(inode->i_sb, __func__, | |
746 | "failed to reget inode block.\n"); | |
747 | return err; | |
748 | } | |
05fe58fd | 749 | nilfs_update_inode(inode, ibh); |
05fe58fd RK |
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 | */ | |
766 | void 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); | |
458c5b08 | 777 | nilfs_mark_inode_dirty(inode); |
47420c79 | 778 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
05fe58fd | 779 | } |