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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. | |
46 | * Bulk read for direct-io is not supported yet. (should be supported) | |
47 | */ | |
48 | int nilfs_get_block(struct inode *inode, sector_t blkoff, | |
49 | struct buffer_head *bh_result, int create) | |
50 | { | |
51 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
52 | unsigned long blknum = 0; | |
53 | int err = 0, ret; | |
54 | struct inode *dat = nilfs_dat_inode(NILFS_I_NILFS(inode)); | |
55 | ||
56 | /* This exclusion control is a workaround; should be revised */ | |
57 | down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
58 | ret = nilfs_bmap_lookup(ii->i_bmap, (unsigned long)blkoff, &blknum); | |
59 | up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
60 | if (ret == 0) { /* found */ | |
61 | map_bh(bh_result, inode->i_sb, blknum); | |
62 | goto out; | |
63 | } | |
05fe58fd RK |
64 | /* data block was not found */ |
65 | if (ret == -ENOENT && create) { | |
66 | struct nilfs_transaction_info ti; | |
67 | ||
68 | bh_result->b_blocknr = 0; | |
69 | err = nilfs_transaction_begin(inode->i_sb, &ti, 1); | |
70 | if (unlikely(err)) | |
71 | goto out; | |
72 | err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff, | |
73 | (unsigned long)bh_result); | |
05fe58fd RK |
74 | if (unlikely(err != 0)) { |
75 | if (err == -EEXIST) { | |
76 | /* | |
77 | * The get_block() function could be called | |
78 | * from multiple callers for an inode. | |
79 | * However, the page having this block must | |
80 | * be locked in this case. | |
81 | */ | |
1f5abe7e | 82 | printk(KERN_WARNING |
05fe58fd RK |
83 | "nilfs_get_block: a race condition " |
84 | "while inserting a data block. " | |
85 | "(inode number=%lu, file block " | |
86 | "offset=%llu)\n", | |
87 | inode->i_ino, | |
88 | (unsigned long long)blkoff); | |
1f5abe7e | 89 | err = 0; |
05fe58fd RK |
90 | } else if (err == -EINVAL) { |
91 | nilfs_error(inode->i_sb, __func__, | |
92 | "broken bmap (inode=%lu)\n", | |
93 | inode->i_ino); | |
94 | err = -EIO; | |
95 | } | |
47420c79 | 96 | nilfs_transaction_abort(inode->i_sb); |
05fe58fd RK |
97 | goto out; |
98 | } | |
47420c79 | 99 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
05fe58fd RK |
100 | /* Error handling should be detailed */ |
101 | set_buffer_new(bh_result); | |
102 | map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed | |
103 | to proper value */ | |
104 | } else if (ret == -ENOENT) { | |
105 | /* not found is not error (e.g. hole); must return without | |
106 | the mapped state flag. */ | |
107 | ; | |
108 | } else { | |
109 | err = ret; | |
110 | } | |
111 | ||
112 | out: | |
113 | return err; | |
114 | } | |
115 | ||
116 | /** | |
117 | * nilfs_readpage() - implement readpage() method of nilfs_aops {} | |
118 | * address_space_operations. | |
119 | * @file - file struct of the file to be read | |
120 | * @page - the page to be read | |
121 | */ | |
122 | static int nilfs_readpage(struct file *file, struct page *page) | |
123 | { | |
124 | return mpage_readpage(page, nilfs_get_block); | |
125 | } | |
126 | ||
127 | /** | |
128 | * nilfs_readpages() - implement readpages() method of nilfs_aops {} | |
129 | * address_space_operations. | |
130 | * @file - file struct of the file to be read | |
131 | * @mapping - address_space struct used for reading multiple pages | |
132 | * @pages - the pages to be read | |
133 | * @nr_pages - number of pages to be read | |
134 | */ | |
135 | static int nilfs_readpages(struct file *file, struct address_space *mapping, | |
136 | struct list_head *pages, unsigned nr_pages) | |
137 | { | |
138 | return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block); | |
139 | } | |
140 | ||
141 | static int nilfs_writepages(struct address_space *mapping, | |
142 | struct writeback_control *wbc) | |
143 | { | |
f30bf3e4 RK |
144 | struct inode *inode = mapping->host; |
145 | int err = 0; | |
146 | ||
147 | if (wbc->sync_mode == WB_SYNC_ALL) | |
148 | err = nilfs_construct_dsync_segment(inode->i_sb, inode, | |
149 | wbc->range_start, | |
150 | wbc->range_end); | |
151 | return err; | |
05fe58fd RK |
152 | } |
153 | ||
154 | static int nilfs_writepage(struct page *page, struct writeback_control *wbc) | |
155 | { | |
156 | struct inode *inode = page->mapping->host; | |
157 | int err; | |
158 | ||
159 | redirty_page_for_writepage(wbc, page); | |
160 | unlock_page(page); | |
161 | ||
162 | if (wbc->sync_mode == WB_SYNC_ALL) { | |
163 | err = nilfs_construct_segment(inode->i_sb); | |
164 | if (unlikely(err)) | |
165 | return err; | |
166 | } else if (wbc->for_reclaim) | |
167 | nilfs_flush_segment(inode->i_sb, inode->i_ino); | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | static int nilfs_set_page_dirty(struct page *page) | |
173 | { | |
174 | int ret = __set_page_dirty_buffers(page); | |
175 | ||
176 | if (ret) { | |
177 | struct inode *inode = page->mapping->host; | |
178 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
179 | unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits); | |
180 | ||
181 | nilfs_set_file_dirty(sbi, inode, nr_dirty); | |
182 | } | |
183 | return ret; | |
184 | } | |
185 | ||
186 | static int nilfs_write_begin(struct file *file, struct address_space *mapping, | |
187 | loff_t pos, unsigned len, unsigned flags, | |
188 | struct page **pagep, void **fsdata) | |
189 | ||
190 | { | |
191 | struct inode *inode = mapping->host; | |
192 | int err = nilfs_transaction_begin(inode->i_sb, NULL, 1); | |
193 | ||
194 | if (unlikely(err)) | |
195 | return err; | |
196 | ||
197 | *pagep = NULL; | |
198 | err = block_write_begin(file, mapping, pos, len, flags, pagep, | |
199 | fsdata, nilfs_get_block); | |
200 | if (unlikely(err)) | |
47420c79 | 201 | nilfs_transaction_abort(inode->i_sb); |
05fe58fd RK |
202 | return err; |
203 | } | |
204 | ||
205 | static int nilfs_write_end(struct file *file, struct address_space *mapping, | |
206 | loff_t pos, unsigned len, unsigned copied, | |
207 | struct page *page, void *fsdata) | |
208 | { | |
209 | struct inode *inode = mapping->host; | |
210 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
211 | unsigned nr_dirty; | |
212 | int err; | |
213 | ||
214 | nr_dirty = nilfs_page_count_clean_buffers(page, start, | |
215 | start + copied); | |
216 | copied = generic_write_end(file, mapping, pos, len, copied, page, | |
217 | fsdata); | |
218 | nilfs_set_file_dirty(NILFS_SB(inode->i_sb), inode, nr_dirty); | |
47420c79 | 219 | err = nilfs_transaction_commit(inode->i_sb); |
05fe58fd RK |
220 | return err ? : copied; |
221 | } | |
222 | ||
223 | static ssize_t | |
224 | nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, | |
225 | loff_t offset, unsigned long nr_segs) | |
226 | { | |
227 | struct file *file = iocb->ki_filp; | |
228 | struct inode *inode = file->f_mapping->host; | |
229 | ssize_t size; | |
05fe58fd RK |
230 | |
231 | if (rw == WRITE) | |
232 | return 0; | |
233 | ||
234 | /* Needs synchronization with the cleaner */ | |
235 | size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
236 | offset, nr_segs, nilfs_get_block, NULL); | |
237 | return size; | |
238 | } | |
239 | ||
240 | struct address_space_operations nilfs_aops = { | |
241 | .writepage = nilfs_writepage, | |
242 | .readpage = nilfs_readpage, | |
243 | /* .sync_page = nilfs_sync_page, */ | |
244 | .writepages = nilfs_writepages, | |
245 | .set_page_dirty = nilfs_set_page_dirty, | |
246 | .readpages = nilfs_readpages, | |
247 | .write_begin = nilfs_write_begin, | |
248 | .write_end = nilfs_write_end, | |
249 | /* .releasepage = nilfs_releasepage, */ | |
250 | .invalidatepage = block_invalidatepage, | |
251 | .direct_IO = nilfs_direct_IO, | |
258ef67e | 252 | .is_partially_uptodate = block_is_partially_uptodate, |
05fe58fd RK |
253 | }; |
254 | ||
255 | struct inode *nilfs_new_inode(struct inode *dir, int mode) | |
256 | { | |
257 | struct super_block *sb = dir->i_sb; | |
258 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
259 | struct inode *inode; | |
260 | struct nilfs_inode_info *ii; | |
261 | int err = -ENOMEM; | |
262 | ino_t ino; | |
263 | ||
264 | inode = new_inode(sb); | |
265 | if (unlikely(!inode)) | |
266 | goto failed; | |
267 | ||
268 | mapping_set_gfp_mask(inode->i_mapping, | |
269 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
270 | ||
271 | ii = NILFS_I(inode); | |
272 | ii->i_state = 1 << NILFS_I_NEW; | |
273 | ||
274 | err = nilfs_ifile_create_inode(sbi->s_ifile, &ino, &ii->i_bh); | |
275 | if (unlikely(err)) | |
276 | goto failed_ifile_create_inode; | |
277 | /* reference count of i_bh inherits from nilfs_mdt_read_block() */ | |
278 | ||
279 | atomic_inc(&sbi->s_inodes_count); | |
280 | ||
281 | inode->i_uid = current_fsuid(); | |
282 | if (dir->i_mode & S_ISGID) { | |
283 | inode->i_gid = dir->i_gid; | |
284 | if (S_ISDIR(mode)) | |
285 | mode |= S_ISGID; | |
286 | } else | |
287 | inode->i_gid = current_fsgid(); | |
288 | ||
289 | inode->i_mode = mode; | |
290 | inode->i_ino = ino; | |
291 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
292 | ||
293 | if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { | |
294 | err = nilfs_bmap_read(ii->i_bmap, NULL); | |
295 | if (err < 0) | |
296 | goto failed_bmap; | |
297 | ||
298 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
299 | /* No lock is needed; iget() ensures it. */ | |
300 | } | |
301 | ||
302 | ii->i_flags = NILFS_I(dir)->i_flags; | |
303 | if (S_ISLNK(mode)) | |
304 | ii->i_flags &= ~(NILFS_IMMUTABLE_FL | NILFS_APPEND_FL); | |
305 | if (!S_ISDIR(mode)) | |
306 | ii->i_flags &= ~NILFS_DIRSYNC_FL; | |
307 | ||
308 | /* ii->i_file_acl = 0; */ | |
309 | /* ii->i_dir_acl = 0; */ | |
05fe58fd RK |
310 | ii->i_dir_start_lookup = 0; |
311 | #ifdef CONFIG_NILFS_FS_POSIX_ACL | |
312 | ii->i_acl = NULL; | |
313 | ii->i_default_acl = NULL; | |
314 | #endif | |
315 | ii->i_cno = 0; | |
316 | nilfs_set_inode_flags(inode); | |
317 | spin_lock(&sbi->s_next_gen_lock); | |
318 | inode->i_generation = sbi->s_next_generation++; | |
319 | spin_unlock(&sbi->s_next_gen_lock); | |
320 | insert_inode_hash(inode); | |
321 | ||
322 | err = nilfs_init_acl(inode, dir); | |
323 | if (unlikely(err)) | |
324 | goto failed_acl; /* never occur. When supporting | |
325 | nilfs_init_acl(), proper cancellation of | |
326 | above jobs should be considered */ | |
327 | ||
328 | mark_inode_dirty(inode); | |
329 | return inode; | |
330 | ||
331 | failed_acl: | |
332 | failed_bmap: | |
333 | inode->i_nlink = 0; | |
334 | iput(inode); /* raw_inode will be deleted through | |
335 | generic_delete_inode() */ | |
336 | goto failed; | |
337 | ||
338 | failed_ifile_create_inode: | |
339 | make_bad_inode(inode); | |
340 | iput(inode); /* if i_nlink == 1, generic_forget_inode() will be | |
341 | called */ | |
342 | failed: | |
343 | return ERR_PTR(err); | |
344 | } | |
345 | ||
346 | void nilfs_free_inode(struct inode *inode) | |
347 | { | |
348 | struct super_block *sb = inode->i_sb; | |
349 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
350 | ||
351 | clear_inode(inode); | |
352 | /* XXX: check error code? Is there any thing I can do? */ | |
353 | (void) nilfs_ifile_delete_inode(sbi->s_ifile, inode->i_ino); | |
354 | atomic_dec(&sbi->s_inodes_count); | |
355 | } | |
356 | ||
357 | void nilfs_set_inode_flags(struct inode *inode) | |
358 | { | |
359 | unsigned int flags = NILFS_I(inode)->i_flags; | |
360 | ||
361 | inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | | |
362 | S_DIRSYNC); | |
363 | if (flags & NILFS_SYNC_FL) | |
364 | inode->i_flags |= S_SYNC; | |
365 | if (flags & NILFS_APPEND_FL) | |
366 | inode->i_flags |= S_APPEND; | |
367 | if (flags & NILFS_IMMUTABLE_FL) | |
368 | inode->i_flags |= S_IMMUTABLE; | |
369 | #ifndef NILFS_ATIME_DISABLE | |
370 | if (flags & NILFS_NOATIME_FL) | |
371 | #endif | |
372 | inode->i_flags |= S_NOATIME; | |
373 | if (flags & NILFS_DIRSYNC_FL) | |
374 | inode->i_flags |= S_DIRSYNC; | |
375 | mapping_set_gfp_mask(inode->i_mapping, | |
376 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
377 | } | |
378 | ||
379 | int nilfs_read_inode_common(struct inode *inode, | |
380 | struct nilfs_inode *raw_inode) | |
381 | { | |
382 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
383 | int err; | |
384 | ||
385 | inode->i_mode = le16_to_cpu(raw_inode->i_mode); | |
386 | inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid); | |
387 | inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid); | |
388 | inode->i_nlink = le16_to_cpu(raw_inode->i_links_count); | |
389 | inode->i_size = le64_to_cpu(raw_inode->i_size); | |
390 | inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime); | |
391 | inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime); | |
392 | inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime); | |
61239230 RK |
393 | inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); |
394 | inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec); | |
395 | inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); | |
396 | if (inode->i_nlink == 0 && inode->i_mode == 0) | |
05fe58fd RK |
397 | return -EINVAL; /* this inode is deleted */ |
398 | ||
399 | inode->i_blocks = le64_to_cpu(raw_inode->i_blocks); | |
400 | ii->i_flags = le32_to_cpu(raw_inode->i_flags); | |
401 | #if 0 | |
402 | ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl); | |
403 | ii->i_dir_acl = S_ISREG(inode->i_mode) ? | |
404 | 0 : le32_to_cpu(raw_inode->i_dir_acl); | |
405 | #endif | |
406 | ii->i_cno = 0; | |
407 | inode->i_generation = le32_to_cpu(raw_inode->i_generation); | |
408 | ||
409 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
410 | S_ISLNK(inode->i_mode)) { | |
411 | err = nilfs_bmap_read(ii->i_bmap, raw_inode); | |
412 | if (err < 0) | |
413 | return err; | |
414 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
415 | /* No lock is needed; iget() ensures it. */ | |
416 | } | |
417 | return 0; | |
418 | } | |
419 | ||
05fe58fd RK |
420 | static int __nilfs_read_inode(struct super_block *sb, unsigned long ino, |
421 | struct inode *inode) | |
422 | { | |
423 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
424 | struct inode *dat = nilfs_dat_inode(sbi->s_nilfs); | |
425 | struct buffer_head *bh; | |
426 | struct nilfs_inode *raw_inode; | |
427 | int err; | |
428 | ||
429 | down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
430 | err = nilfs_ifile_get_inode_block(sbi->s_ifile, ino, &bh); | |
431 | if (unlikely(err)) | |
432 | goto bad_inode; | |
433 | ||
434 | raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, bh); | |
435 | ||
436 | #ifdef CONFIG_NILFS_FS_POSIX_ACL | |
437 | ii->i_acl = NILFS_ACL_NOT_CACHED; | |
438 | ii->i_default_acl = NILFS_ACL_NOT_CACHED; | |
439 | #endif | |
440 | if (nilfs_read_inode_common(inode, raw_inode)) | |
441 | goto failed_unmap; | |
442 | ||
443 | if (S_ISREG(inode->i_mode)) { | |
444 | inode->i_op = &nilfs_file_inode_operations; | |
445 | inode->i_fop = &nilfs_file_operations; | |
446 | inode->i_mapping->a_ops = &nilfs_aops; | |
05fe58fd RK |
447 | } else if (S_ISDIR(inode->i_mode)) { |
448 | inode->i_op = &nilfs_dir_inode_operations; | |
449 | inode->i_fop = &nilfs_dir_operations; | |
450 | inode->i_mapping->a_ops = &nilfs_aops; | |
451 | } else if (S_ISLNK(inode->i_mode)) { | |
452 | inode->i_op = &nilfs_symlink_inode_operations; | |
453 | inode->i_mapping->a_ops = &nilfs_aops; | |
454 | } else { | |
455 | inode->i_op = &nilfs_special_inode_operations; | |
456 | init_special_inode( | |
457 | inode, inode->i_mode, | |
458 | new_decode_dev(le64_to_cpu(raw_inode->i_device_code))); | |
459 | } | |
460 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh); | |
461 | brelse(bh); | |
462 | up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
463 | nilfs_set_inode_flags(inode); | |
464 | return 0; | |
465 | ||
466 | failed_unmap: | |
467 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh); | |
468 | brelse(bh); | |
469 | ||
470 | bad_inode: | |
471 | up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
472 | return err; | |
473 | } | |
474 | ||
475 | struct inode *nilfs_iget(struct super_block *sb, unsigned long ino) | |
476 | { | |
477 | struct inode *inode; | |
478 | int err; | |
479 | ||
480 | inode = iget_locked(sb, ino); | |
481 | if (unlikely(!inode)) | |
482 | return ERR_PTR(-ENOMEM); | |
483 | if (!(inode->i_state & I_NEW)) | |
484 | return inode; | |
485 | ||
486 | err = __nilfs_read_inode(sb, ino, inode); | |
487 | if (unlikely(err)) { | |
488 | iget_failed(inode); | |
489 | return ERR_PTR(err); | |
490 | } | |
491 | unlock_new_inode(inode); | |
492 | return inode; | |
493 | } | |
494 | ||
495 | void nilfs_write_inode_common(struct inode *inode, | |
496 | struct nilfs_inode *raw_inode, int has_bmap) | |
497 | { | |
498 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
499 | ||
500 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); | |
501 | raw_inode->i_uid = cpu_to_le32(inode->i_uid); | |
502 | raw_inode->i_gid = cpu_to_le32(inode->i_gid); | |
503 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); | |
504 | raw_inode->i_size = cpu_to_le64(inode->i_size); | |
505 | raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); | |
506 | raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec); | |
61239230 RK |
507 | raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); |
508 | raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); | |
05fe58fd RK |
509 | raw_inode->i_blocks = cpu_to_le64(inode->i_blocks); |
510 | ||
05fe58fd RK |
511 | raw_inode->i_flags = cpu_to_le32(ii->i_flags); |
512 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); | |
513 | ||
514 | if (has_bmap) | |
515 | nilfs_bmap_write(ii->i_bmap, raw_inode); | |
516 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
517 | raw_inode->i_device_code = | |
518 | cpu_to_le64(new_encode_dev(inode->i_rdev)); | |
519 | /* When extending inode, nilfs->ns_inode_size should be checked | |
520 | for substitutions of appended fields */ | |
521 | } | |
522 | ||
523 | void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh) | |
524 | { | |
525 | ino_t ino = inode->i_ino; | |
526 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
527 | struct super_block *sb = inode->i_sb; | |
528 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
529 | struct nilfs_inode *raw_inode; | |
530 | ||
531 | raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, ibh); | |
532 | ||
533 | /* The buffer is guarded with lock_buffer() by the caller */ | |
534 | if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state)) | |
535 | memset(raw_inode, 0, NILFS_MDT(sbi->s_ifile)->mi_entry_size); | |
536 | set_bit(NILFS_I_INODE_DIRTY, &ii->i_state); | |
537 | ||
538 | nilfs_write_inode_common(inode, raw_inode, 0); | |
539 | /* XXX: call with has_bmap = 0 is a workaround to avoid | |
540 | deadlock of bmap. This delays update of i_bmap to just | |
541 | before writing */ | |
542 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, ibh); | |
543 | } | |
544 | ||
545 | #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */ | |
546 | ||
547 | static void nilfs_truncate_bmap(struct nilfs_inode_info *ii, | |
548 | unsigned long from) | |
549 | { | |
550 | unsigned long b; | |
551 | int ret; | |
552 | ||
553 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
554 | return; | |
555 | repeat: | |
556 | ret = nilfs_bmap_last_key(ii->i_bmap, &b); | |
557 | if (ret == -ENOENT) | |
558 | return; | |
559 | else if (ret < 0) | |
560 | goto failed; | |
561 | ||
562 | if (b < from) | |
563 | return; | |
564 | ||
565 | b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from); | |
566 | ret = nilfs_bmap_truncate(ii->i_bmap, b); | |
567 | nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb); | |
568 | if (!ret || (ret == -ENOMEM && | |
569 | nilfs_bmap_truncate(ii->i_bmap, b) == 0)) | |
570 | goto repeat; | |
571 | ||
572 | failed: | |
573 | if (ret == -EINVAL) | |
574 | nilfs_error(ii->vfs_inode.i_sb, __func__, | |
575 | "bmap is broken (ino=%lu)", ii->vfs_inode.i_ino); | |
576 | else | |
577 | nilfs_warning(ii->vfs_inode.i_sb, __func__, | |
578 | "failed to truncate bmap (ino=%lu, err=%d)", | |
579 | ii->vfs_inode.i_ino, ret); | |
580 | } | |
581 | ||
582 | void nilfs_truncate(struct inode *inode) | |
583 | { | |
584 | unsigned long blkoff; | |
585 | unsigned int blocksize; | |
586 | struct nilfs_transaction_info ti; | |
587 | struct super_block *sb = inode->i_sb; | |
588 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
05fe58fd RK |
589 | |
590 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
591 | return; | |
592 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
593 | return; | |
594 | ||
595 | blocksize = sb->s_blocksize; | |
596 | blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits; | |
1f5abe7e | 597 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
05fe58fd RK |
598 | |
599 | block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block); | |
600 | ||
601 | nilfs_truncate_bmap(ii, blkoff); | |
602 | ||
603 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
604 | if (IS_SYNC(inode)) | |
605 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
606 | ||
607 | nilfs_set_file_dirty(NILFS_SB(sb), inode, 0); | |
47420c79 | 608 | nilfs_transaction_commit(sb); |
05fe58fd RK |
609 | /* May construct a logical segment and may fail in sync mode. |
610 | But truncate has no return value. */ | |
611 | } | |
612 | ||
613 | void nilfs_delete_inode(struct inode *inode) | |
614 | { | |
615 | struct nilfs_transaction_info ti; | |
616 | struct super_block *sb = inode->i_sb; | |
617 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
05fe58fd RK |
618 | |
619 | if (unlikely(is_bad_inode(inode))) { | |
620 | if (inode->i_data.nrpages) | |
621 | truncate_inode_pages(&inode->i_data, 0); | |
622 | clear_inode(inode); | |
623 | return; | |
624 | } | |
1f5abe7e RK |
625 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
626 | ||
05fe58fd RK |
627 | if (inode->i_data.nrpages) |
628 | truncate_inode_pages(&inode->i_data, 0); | |
629 | ||
630 | nilfs_truncate_bmap(ii, 0); | |
631 | nilfs_free_inode(inode); | |
632 | /* nilfs_free_inode() marks inode buffer dirty */ | |
633 | if (IS_SYNC(inode)) | |
634 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
47420c79 | 635 | nilfs_transaction_commit(sb); |
05fe58fd RK |
636 | /* May construct a logical segment and may fail in sync mode. |
637 | But delete_inode has no return value. */ | |
638 | } | |
639 | ||
640 | int nilfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
641 | { | |
642 | struct nilfs_transaction_info ti; | |
643 | struct inode *inode = dentry->d_inode; | |
644 | struct super_block *sb = inode->i_sb; | |
47420c79 | 645 | int err; |
05fe58fd RK |
646 | |
647 | err = inode_change_ok(inode, iattr); | |
648 | if (err) | |
649 | return err; | |
650 | ||
651 | err = nilfs_transaction_begin(sb, &ti, 0); | |
652 | if (unlikely(err)) | |
653 | return err; | |
654 | err = inode_setattr(inode, iattr); | |
655 | if (!err && (iattr->ia_valid & ATTR_MODE)) | |
656 | err = nilfs_acl_chmod(inode); | |
47420c79 RK |
657 | if (likely(!err)) |
658 | err = nilfs_transaction_commit(sb); | |
659 | else | |
660 | nilfs_transaction_abort(sb); | |
661 | ||
662 | return err; | |
05fe58fd RK |
663 | } |
664 | ||
665 | int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode, | |
666 | struct buffer_head **pbh) | |
667 | { | |
668 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
669 | int err; | |
670 | ||
671 | spin_lock(&sbi->s_inode_lock); | |
672 | /* Caller of this function MUST lock s_inode_lock */ | |
673 | if (ii->i_bh == NULL) { | |
674 | spin_unlock(&sbi->s_inode_lock); | |
675 | err = nilfs_ifile_get_inode_block(sbi->s_ifile, inode->i_ino, | |
676 | pbh); | |
677 | if (unlikely(err)) | |
678 | return err; | |
679 | spin_lock(&sbi->s_inode_lock); | |
680 | if (ii->i_bh == NULL) | |
681 | ii->i_bh = *pbh; | |
682 | else { | |
683 | brelse(*pbh); | |
684 | *pbh = ii->i_bh; | |
685 | } | |
686 | } else | |
687 | *pbh = ii->i_bh; | |
688 | ||
689 | get_bh(*pbh); | |
690 | spin_unlock(&sbi->s_inode_lock); | |
691 | return 0; | |
692 | } | |
693 | ||
694 | int nilfs_inode_dirty(struct inode *inode) | |
695 | { | |
696 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
697 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
698 | int ret = 0; | |
699 | ||
700 | if (!list_empty(&ii->i_dirty)) { | |
701 | spin_lock(&sbi->s_inode_lock); | |
702 | ret = test_bit(NILFS_I_DIRTY, &ii->i_state) || | |
703 | test_bit(NILFS_I_BUSY, &ii->i_state); | |
704 | spin_unlock(&sbi->s_inode_lock); | |
705 | } | |
706 | return ret; | |
707 | } | |
708 | ||
709 | int nilfs_set_file_dirty(struct nilfs_sb_info *sbi, struct inode *inode, | |
710 | unsigned nr_dirty) | |
711 | { | |
712 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
713 | ||
714 | atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks); | |
715 | ||
458c5b08 | 716 | if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state)) |
05fe58fd RK |
717 | return 0; |
718 | ||
719 | spin_lock(&sbi->s_inode_lock); | |
720 | if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && | |
721 | !test_bit(NILFS_I_BUSY, &ii->i_state)) { | |
722 | /* Because this routine may race with nilfs_dispose_list(), | |
723 | we have to check NILFS_I_QUEUED here, too. */ | |
724 | if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) { | |
725 | /* This will happen when somebody is freeing | |
726 | this inode. */ | |
727 | nilfs_warning(sbi->s_super, __func__, | |
728 | "cannot get inode (ino=%lu)\n", | |
729 | inode->i_ino); | |
730 | spin_unlock(&sbi->s_inode_lock); | |
731 | return -EINVAL; /* NILFS_I_DIRTY may remain for | |
732 | freeing inode */ | |
733 | } | |
734 | list_del(&ii->i_dirty); | |
735 | list_add_tail(&ii->i_dirty, &sbi->s_dirty_files); | |
736 | set_bit(NILFS_I_QUEUED, &ii->i_state); | |
737 | } | |
738 | spin_unlock(&sbi->s_inode_lock); | |
739 | return 0; | |
740 | } | |
741 | ||
742 | int nilfs_mark_inode_dirty(struct inode *inode) | |
743 | { | |
744 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
745 | struct buffer_head *ibh; | |
746 | int err; | |
747 | ||
748 | err = nilfs_load_inode_block(sbi, inode, &ibh); | |
749 | if (unlikely(err)) { | |
750 | nilfs_warning(inode->i_sb, __func__, | |
751 | "failed to reget inode block.\n"); | |
752 | return err; | |
753 | } | |
754 | lock_buffer(ibh); | |
755 | nilfs_update_inode(inode, ibh); | |
756 | unlock_buffer(ibh); | |
757 | nilfs_mdt_mark_buffer_dirty(ibh); | |
758 | nilfs_mdt_mark_dirty(sbi->s_ifile); | |
759 | brelse(ibh); | |
760 | return 0; | |
761 | } | |
762 | ||
763 | /** | |
764 | * nilfs_dirty_inode - reflect changes on given inode to an inode block. | |
765 | * @inode: inode of the file to be registered. | |
766 | * | |
767 | * nilfs_dirty_inode() loads a inode block containing the specified | |
768 | * @inode and copies data from a nilfs_inode to a corresponding inode | |
769 | * entry in the inode block. This operation is excluded from the segment | |
770 | * construction. This function can be called both as a single operation | |
771 | * and as a part of indivisible file operations. | |
772 | */ | |
773 | void nilfs_dirty_inode(struct inode *inode) | |
774 | { | |
775 | struct nilfs_transaction_info ti; | |
776 | ||
777 | if (is_bad_inode(inode)) { | |
778 | nilfs_warning(inode->i_sb, __func__, | |
779 | "tried to mark bad_inode dirty. ignored.\n"); | |
780 | dump_stack(); | |
781 | return; | |
782 | } | |
783 | nilfs_transaction_begin(inode->i_sb, &ti, 0); | |
458c5b08 | 784 | nilfs_mark_inode_dirty(inode); |
47420c79 | 785 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
05fe58fd | 786 | } |