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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> | |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
05fe58fd RK |
26 | #include <linux/mpage.h> |
27 | #include <linux/writeback.h> | |
f30bf3e4 | 28 | #include <linux/uio.h> |
05fe58fd | 29 | #include "nilfs.h" |
6fd1e5c9 | 30 | #include "btnode.h" |
05fe58fd RK |
31 | #include "segment.h" |
32 | #include "page.h" | |
33 | #include "mdt.h" | |
34 | #include "cpfile.h" | |
35 | #include "ifile.h" | |
36 | ||
0e14a359 RK |
37 | struct nilfs_iget_args { |
38 | u64 ino; | |
39 | __u64 cno; | |
40 | int for_gc; | |
41 | }; | |
05fe58fd RK |
42 | |
43 | /** | |
44 | * nilfs_get_block() - get a file block on the filesystem (callback function) | |
45 | * @inode - inode struct of the target file | |
46 | * @blkoff - file block number | |
47 | * @bh_result - buffer head to be mapped on | |
48 | * @create - indicate whether allocating the block or not when it has not | |
49 | * been allocated yet. | |
50 | * | |
51 | * This function does not issue actual read request of the specified data | |
52 | * block. It is done by VFS. | |
05fe58fd RK |
53 | */ |
54 | int nilfs_get_block(struct inode *inode, sector_t blkoff, | |
55 | struct buffer_head *bh_result, int create) | |
56 | { | |
57 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
c3a7abf0 | 58 | __u64 blknum = 0; |
05fe58fd RK |
59 | int err = 0, ret; |
60 | struct inode *dat = nilfs_dat_inode(NILFS_I_NILFS(inode)); | |
c3a7abf0 | 61 | unsigned maxblocks = bh_result->b_size >> inode->i_blkbits; |
05fe58fd | 62 | |
c3a7abf0 RK |
63 | down_read(&NILFS_MDT(dat)->mi_sem); |
64 | ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks); | |
65 | up_read(&NILFS_MDT(dat)->mi_sem); | |
66 | if (ret >= 0) { /* found */ | |
05fe58fd | 67 | map_bh(bh_result, inode->i_sb, blknum); |
c3a7abf0 RK |
68 | if (ret > 0) |
69 | bh_result->b_size = (ret << inode->i_blkbits); | |
05fe58fd RK |
70 | goto out; |
71 | } | |
05fe58fd RK |
72 | /* data block was not found */ |
73 | if (ret == -ENOENT && create) { | |
74 | struct nilfs_transaction_info ti; | |
75 | ||
76 | bh_result->b_blocknr = 0; | |
77 | err = nilfs_transaction_begin(inode->i_sb, &ti, 1); | |
78 | if (unlikely(err)) | |
79 | goto out; | |
80 | err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff, | |
81 | (unsigned long)bh_result); | |
05fe58fd RK |
82 | if (unlikely(err != 0)) { |
83 | if (err == -EEXIST) { | |
84 | /* | |
85 | * The get_block() function could be called | |
86 | * from multiple callers for an inode. | |
87 | * However, the page having this block must | |
88 | * be locked in this case. | |
89 | */ | |
1f5abe7e | 90 | printk(KERN_WARNING |
05fe58fd RK |
91 | "nilfs_get_block: a race condition " |
92 | "while inserting a data block. " | |
93 | "(inode number=%lu, file block " | |
94 | "offset=%llu)\n", | |
95 | inode->i_ino, | |
96 | (unsigned long long)blkoff); | |
1f5abe7e | 97 | err = 0; |
05fe58fd RK |
98 | } else if (err == -EINVAL) { |
99 | nilfs_error(inode->i_sb, __func__, | |
100 | "broken bmap (inode=%lu)\n", | |
101 | inode->i_ino); | |
102 | err = -EIO; | |
103 | } | |
47420c79 | 104 | nilfs_transaction_abort(inode->i_sb); |
05fe58fd RK |
105 | goto out; |
106 | } | |
abdb318b | 107 | nilfs_mark_inode_dirty(inode); |
47420c79 | 108 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
05fe58fd RK |
109 | /* Error handling should be detailed */ |
110 | set_buffer_new(bh_result); | |
111 | map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed | |
112 | to proper value */ | |
113 | } else if (ret == -ENOENT) { | |
114 | /* not found is not error (e.g. hole); must return without | |
115 | the mapped state flag. */ | |
116 | ; | |
117 | } else { | |
118 | err = ret; | |
119 | } | |
120 | ||
121 | out: | |
122 | return err; | |
123 | } | |
124 | ||
125 | /** | |
126 | * nilfs_readpage() - implement readpage() method of nilfs_aops {} | |
127 | * address_space_operations. | |
128 | * @file - file struct of the file to be read | |
129 | * @page - the page to be read | |
130 | */ | |
131 | static int nilfs_readpage(struct file *file, struct page *page) | |
132 | { | |
133 | return mpage_readpage(page, nilfs_get_block); | |
134 | } | |
135 | ||
136 | /** | |
137 | * nilfs_readpages() - implement readpages() method of nilfs_aops {} | |
138 | * address_space_operations. | |
139 | * @file - file struct of the file to be read | |
140 | * @mapping - address_space struct used for reading multiple pages | |
141 | * @pages - the pages to be read | |
142 | * @nr_pages - number of pages to be read | |
143 | */ | |
144 | static int nilfs_readpages(struct file *file, struct address_space *mapping, | |
145 | struct list_head *pages, unsigned nr_pages) | |
146 | { | |
147 | return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block); | |
148 | } | |
149 | ||
150 | static int nilfs_writepages(struct address_space *mapping, | |
151 | struct writeback_control *wbc) | |
152 | { | |
f30bf3e4 RK |
153 | struct inode *inode = mapping->host; |
154 | int err = 0; | |
155 | ||
156 | if (wbc->sync_mode == WB_SYNC_ALL) | |
157 | err = nilfs_construct_dsync_segment(inode->i_sb, inode, | |
158 | wbc->range_start, | |
159 | wbc->range_end); | |
160 | return err; | |
05fe58fd RK |
161 | } |
162 | ||
163 | static int nilfs_writepage(struct page *page, struct writeback_control *wbc) | |
164 | { | |
165 | struct inode *inode = page->mapping->host; | |
166 | int err; | |
167 | ||
168 | redirty_page_for_writepage(wbc, page); | |
169 | unlock_page(page); | |
170 | ||
171 | if (wbc->sync_mode == WB_SYNC_ALL) { | |
172 | err = nilfs_construct_segment(inode->i_sb); | |
173 | if (unlikely(err)) | |
174 | return err; | |
175 | } else if (wbc->for_reclaim) | |
176 | nilfs_flush_segment(inode->i_sb, inode->i_ino); | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | static int nilfs_set_page_dirty(struct page *page) | |
182 | { | |
183 | int ret = __set_page_dirty_buffers(page); | |
184 | ||
185 | if (ret) { | |
186 | struct inode *inode = page->mapping->host; | |
187 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
188 | unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits); | |
189 | ||
190 | nilfs_set_file_dirty(sbi, inode, nr_dirty); | |
191 | } | |
192 | return ret; | |
193 | } | |
194 | ||
195 | static int nilfs_write_begin(struct file *file, struct address_space *mapping, | |
196 | loff_t pos, unsigned len, unsigned flags, | |
197 | struct page **pagep, void **fsdata) | |
198 | ||
199 | { | |
200 | struct inode *inode = mapping->host; | |
201 | int err = nilfs_transaction_begin(inode->i_sb, NULL, 1); | |
202 | ||
203 | if (unlikely(err)) | |
204 | return err; | |
205 | ||
155130a4 CH |
206 | err = block_write_begin(mapping, pos, len, flags, pagep, |
207 | nilfs_get_block); | |
208 | if (unlikely(err)) { | |
209 | loff_t isize = mapping->host->i_size; | |
210 | if (pos + len > isize) | |
211 | vmtruncate(mapping->host, isize); | |
212 | ||
47420c79 | 213 | nilfs_transaction_abort(inode->i_sb); |
155130a4 | 214 | } |
05fe58fd RK |
215 | return err; |
216 | } | |
217 | ||
218 | static int nilfs_write_end(struct file *file, struct address_space *mapping, | |
219 | loff_t pos, unsigned len, unsigned copied, | |
220 | struct page *page, void *fsdata) | |
221 | { | |
222 | struct inode *inode = mapping->host; | |
223 | unsigned start = pos & (PAGE_CACHE_SIZE - 1); | |
224 | unsigned nr_dirty; | |
225 | int err; | |
226 | ||
227 | nr_dirty = nilfs_page_count_clean_buffers(page, start, | |
228 | start + copied); | |
229 | copied = generic_write_end(file, mapping, pos, len, copied, page, | |
230 | fsdata); | |
231 | nilfs_set_file_dirty(NILFS_SB(inode->i_sb), inode, nr_dirty); | |
47420c79 | 232 | err = nilfs_transaction_commit(inode->i_sb); |
05fe58fd RK |
233 | return err ? : copied; |
234 | } | |
235 | ||
236 | static ssize_t | |
237 | nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, | |
238 | loff_t offset, unsigned long nr_segs) | |
239 | { | |
240 | struct file *file = iocb->ki_filp; | |
241 | struct inode *inode = file->f_mapping->host; | |
242 | ssize_t size; | |
05fe58fd RK |
243 | |
244 | if (rw == WRITE) | |
245 | return 0; | |
246 | ||
247 | /* Needs synchronization with the cleaner */ | |
248 | size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
249 | offset, nr_segs, nilfs_get_block, NULL); | |
eafdc7d1 CH |
250 | |
251 | /* | |
252 | * In case of error extending write may have instantiated a few | |
253 | * blocks outside i_size. Trim these off again. | |
254 | */ | |
255 | if (unlikely((rw & WRITE) && size < 0)) { | |
256 | loff_t isize = i_size_read(inode); | |
257 | loff_t end = offset + iov_length(iov, nr_segs); | |
258 | ||
259 | if (end > isize) | |
260 | vmtruncate(inode, isize); | |
261 | } | |
262 | ||
05fe58fd RK |
263 | return size; |
264 | } | |
265 | ||
7f09410b | 266 | const struct address_space_operations nilfs_aops = { |
05fe58fd RK |
267 | .writepage = nilfs_writepage, |
268 | .readpage = nilfs_readpage, | |
e85dc1d5 | 269 | .sync_page = block_sync_page, |
05fe58fd RK |
270 | .writepages = nilfs_writepages, |
271 | .set_page_dirty = nilfs_set_page_dirty, | |
272 | .readpages = nilfs_readpages, | |
273 | .write_begin = nilfs_write_begin, | |
274 | .write_end = nilfs_write_end, | |
275 | /* .releasepage = nilfs_releasepage, */ | |
276 | .invalidatepage = block_invalidatepage, | |
277 | .direct_IO = nilfs_direct_IO, | |
258ef67e | 278 | .is_partially_uptodate = block_is_partially_uptodate, |
05fe58fd RK |
279 | }; |
280 | ||
281 | struct inode *nilfs_new_inode(struct inode *dir, int mode) | |
282 | { | |
283 | struct super_block *sb = dir->i_sb; | |
284 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
285 | struct inode *inode; | |
286 | struct nilfs_inode_info *ii; | |
287 | int err = -ENOMEM; | |
288 | ino_t ino; | |
289 | ||
290 | inode = new_inode(sb); | |
291 | if (unlikely(!inode)) | |
292 | goto failed; | |
293 | ||
294 | mapping_set_gfp_mask(inode->i_mapping, | |
295 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
296 | ||
297 | ii = NILFS_I(inode); | |
298 | ii->i_state = 1 << NILFS_I_NEW; | |
299 | ||
300 | err = nilfs_ifile_create_inode(sbi->s_ifile, &ino, &ii->i_bh); | |
301 | if (unlikely(err)) | |
302 | goto failed_ifile_create_inode; | |
303 | /* reference count of i_bh inherits from nilfs_mdt_read_block() */ | |
304 | ||
305 | atomic_inc(&sbi->s_inodes_count); | |
73459dcc | 306 | inode_init_owner(inode, dir, mode); |
05fe58fd RK |
307 | inode->i_ino = ino; |
308 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
309 | ||
310 | if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { | |
311 | err = nilfs_bmap_read(ii->i_bmap, NULL); | |
312 | if (err < 0) | |
313 | goto failed_bmap; | |
314 | ||
315 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
316 | /* No lock is needed; iget() ensures it. */ | |
317 | } | |
318 | ||
319 | ii->i_flags = NILFS_I(dir)->i_flags; | |
320 | if (S_ISLNK(mode)) | |
321 | ii->i_flags &= ~(NILFS_IMMUTABLE_FL | NILFS_APPEND_FL); | |
322 | if (!S_ISDIR(mode)) | |
323 | ii->i_flags &= ~NILFS_DIRSYNC_FL; | |
324 | ||
325 | /* ii->i_file_acl = 0; */ | |
326 | /* ii->i_dir_acl = 0; */ | |
05fe58fd | 327 | ii->i_dir_start_lookup = 0; |
05fe58fd RK |
328 | nilfs_set_inode_flags(inode); |
329 | spin_lock(&sbi->s_next_gen_lock); | |
330 | inode->i_generation = sbi->s_next_generation++; | |
331 | spin_unlock(&sbi->s_next_gen_lock); | |
332 | insert_inode_hash(inode); | |
333 | ||
334 | err = nilfs_init_acl(inode, dir); | |
335 | if (unlikely(err)) | |
336 | goto failed_acl; /* never occur. When supporting | |
337 | nilfs_init_acl(), proper cancellation of | |
338 | above jobs should be considered */ | |
339 | ||
05fe58fd RK |
340 | return inode; |
341 | ||
342 | failed_acl: | |
343 | failed_bmap: | |
344 | inode->i_nlink = 0; | |
345 | iput(inode); /* raw_inode will be deleted through | |
346 | generic_delete_inode() */ | |
347 | goto failed; | |
348 | ||
349 | failed_ifile_create_inode: | |
350 | make_bad_inode(inode); | |
351 | iput(inode); /* if i_nlink == 1, generic_forget_inode() will be | |
352 | called */ | |
353 | failed: | |
354 | return ERR_PTR(err); | |
355 | } | |
356 | ||
357 | void nilfs_free_inode(struct inode *inode) | |
358 | { | |
359 | struct super_block *sb = inode->i_sb; | |
360 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
361 | ||
05fe58fd RK |
362 | /* XXX: check error code? Is there any thing I can do? */ |
363 | (void) nilfs_ifile_delete_inode(sbi->s_ifile, inode->i_ino); | |
364 | atomic_dec(&sbi->s_inodes_count); | |
365 | } | |
366 | ||
367 | void nilfs_set_inode_flags(struct inode *inode) | |
368 | { | |
369 | unsigned int flags = NILFS_I(inode)->i_flags; | |
370 | ||
371 | inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | | |
372 | S_DIRSYNC); | |
373 | if (flags & NILFS_SYNC_FL) | |
374 | inode->i_flags |= S_SYNC; | |
375 | if (flags & NILFS_APPEND_FL) | |
376 | inode->i_flags |= S_APPEND; | |
377 | if (flags & NILFS_IMMUTABLE_FL) | |
378 | inode->i_flags |= S_IMMUTABLE; | |
379 | #ifndef NILFS_ATIME_DISABLE | |
380 | if (flags & NILFS_NOATIME_FL) | |
381 | #endif | |
382 | inode->i_flags |= S_NOATIME; | |
383 | if (flags & NILFS_DIRSYNC_FL) | |
384 | inode->i_flags |= S_DIRSYNC; | |
385 | mapping_set_gfp_mask(inode->i_mapping, | |
386 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); | |
387 | } | |
388 | ||
389 | int nilfs_read_inode_common(struct inode *inode, | |
390 | struct nilfs_inode *raw_inode) | |
391 | { | |
392 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
393 | int err; | |
394 | ||
395 | inode->i_mode = le16_to_cpu(raw_inode->i_mode); | |
396 | inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid); | |
397 | inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid); | |
398 | inode->i_nlink = le16_to_cpu(raw_inode->i_links_count); | |
399 | inode->i_size = le64_to_cpu(raw_inode->i_size); | |
400 | inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime); | |
401 | inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime); | |
402 | inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime); | |
61239230 RK |
403 | inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); |
404 | inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec); | |
405 | inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); | |
406 | if (inode->i_nlink == 0 && inode->i_mode == 0) | |
05fe58fd RK |
407 | return -EINVAL; /* this inode is deleted */ |
408 | ||
409 | inode->i_blocks = le64_to_cpu(raw_inode->i_blocks); | |
410 | ii->i_flags = le32_to_cpu(raw_inode->i_flags); | |
411 | #if 0 | |
412 | ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl); | |
413 | ii->i_dir_acl = S_ISREG(inode->i_mode) ? | |
414 | 0 : le32_to_cpu(raw_inode->i_dir_acl); | |
415 | #endif | |
3cc811bf | 416 | ii->i_dir_start_lookup = 0; |
05fe58fd RK |
417 | inode->i_generation = le32_to_cpu(raw_inode->i_generation); |
418 | ||
419 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
420 | S_ISLNK(inode->i_mode)) { | |
421 | err = nilfs_bmap_read(ii->i_bmap, raw_inode); | |
422 | if (err < 0) | |
423 | return err; | |
424 | set_bit(NILFS_I_BMAP, &ii->i_state); | |
425 | /* No lock is needed; iget() ensures it. */ | |
426 | } | |
427 | return 0; | |
428 | } | |
429 | ||
05fe58fd RK |
430 | static int __nilfs_read_inode(struct super_block *sb, unsigned long ino, |
431 | struct inode *inode) | |
432 | { | |
433 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
434 | struct inode *dat = nilfs_dat_inode(sbi->s_nilfs); | |
435 | struct buffer_head *bh; | |
436 | struct nilfs_inode *raw_inode; | |
437 | int err; | |
438 | ||
439 | down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
440 | err = nilfs_ifile_get_inode_block(sbi->s_ifile, ino, &bh); | |
441 | if (unlikely(err)) | |
442 | goto bad_inode; | |
443 | ||
444 | raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, bh); | |
445 | ||
1b2f5a64 RK |
446 | err = nilfs_read_inode_common(inode, raw_inode); |
447 | if (err) | |
05fe58fd RK |
448 | goto failed_unmap; |
449 | ||
450 | if (S_ISREG(inode->i_mode)) { | |
451 | inode->i_op = &nilfs_file_inode_operations; | |
452 | inode->i_fop = &nilfs_file_operations; | |
453 | inode->i_mapping->a_ops = &nilfs_aops; | |
05fe58fd RK |
454 | } else if (S_ISDIR(inode->i_mode)) { |
455 | inode->i_op = &nilfs_dir_inode_operations; | |
456 | inode->i_fop = &nilfs_dir_operations; | |
457 | inode->i_mapping->a_ops = &nilfs_aops; | |
458 | } else if (S_ISLNK(inode->i_mode)) { | |
459 | inode->i_op = &nilfs_symlink_inode_operations; | |
460 | inode->i_mapping->a_ops = &nilfs_aops; | |
461 | } else { | |
462 | inode->i_op = &nilfs_special_inode_operations; | |
463 | init_special_inode( | |
464 | inode, inode->i_mode, | |
cdce214e | 465 | huge_decode_dev(le64_to_cpu(raw_inode->i_device_code))); |
05fe58fd RK |
466 | } |
467 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh); | |
468 | brelse(bh); | |
469 | up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
470 | nilfs_set_inode_flags(inode); | |
471 | return 0; | |
472 | ||
473 | failed_unmap: | |
474 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh); | |
475 | brelse(bh); | |
476 | ||
477 | bad_inode: | |
478 | up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ | |
479 | return err; | |
480 | } | |
481 | ||
0e14a359 RK |
482 | static int nilfs_iget_test(struct inode *inode, void *opaque) |
483 | { | |
484 | struct nilfs_iget_args *args = opaque; | |
485 | struct nilfs_inode_info *ii; | |
486 | ||
487 | if (args->ino != inode->i_ino) | |
488 | return 0; | |
489 | ||
490 | ii = NILFS_I(inode); | |
491 | if (!test_bit(NILFS_I_GCINODE, &ii->i_state)) | |
492 | return !args->for_gc; | |
493 | ||
494 | return args->for_gc && args->cno == ii->i_cno; | |
495 | } | |
496 | ||
497 | static int nilfs_iget_set(struct inode *inode, void *opaque) | |
498 | { | |
499 | struct nilfs_iget_args *args = opaque; | |
500 | ||
501 | inode->i_ino = args->ino; | |
502 | if (args->for_gc) { | |
503 | NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE; | |
504 | NILFS_I(inode)->i_cno = args->cno; | |
505 | } | |
506 | return 0; | |
507 | } | |
508 | ||
05fe58fd RK |
509 | struct inode *nilfs_iget(struct super_block *sb, unsigned long ino) |
510 | { | |
0e14a359 | 511 | struct nilfs_iget_args args = { .ino = ino, .cno = 0, .for_gc = 0 }; |
05fe58fd RK |
512 | struct inode *inode; |
513 | int err; | |
514 | ||
0e14a359 | 515 | inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args); |
05fe58fd RK |
516 | if (unlikely(!inode)) |
517 | return ERR_PTR(-ENOMEM); | |
518 | if (!(inode->i_state & I_NEW)) | |
519 | return inode; | |
520 | ||
521 | err = __nilfs_read_inode(sb, ino, inode); | |
522 | if (unlikely(err)) { | |
523 | iget_failed(inode); | |
524 | return ERR_PTR(err); | |
525 | } | |
526 | unlock_new_inode(inode); | |
527 | return inode; | |
528 | } | |
529 | ||
530 | void nilfs_write_inode_common(struct inode *inode, | |
531 | struct nilfs_inode *raw_inode, int has_bmap) | |
532 | { | |
533 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
534 | ||
535 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); | |
536 | raw_inode->i_uid = cpu_to_le32(inode->i_uid); | |
537 | raw_inode->i_gid = cpu_to_le32(inode->i_gid); | |
538 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); | |
539 | raw_inode->i_size = cpu_to_le64(inode->i_size); | |
540 | raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); | |
541 | raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec); | |
61239230 RK |
542 | raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); |
543 | raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); | |
05fe58fd RK |
544 | raw_inode->i_blocks = cpu_to_le64(inode->i_blocks); |
545 | ||
05fe58fd RK |
546 | raw_inode->i_flags = cpu_to_le32(ii->i_flags); |
547 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); | |
548 | ||
549 | if (has_bmap) | |
550 | nilfs_bmap_write(ii->i_bmap, raw_inode); | |
551 | else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) | |
552 | raw_inode->i_device_code = | |
cdce214e | 553 | cpu_to_le64(huge_encode_dev(inode->i_rdev)); |
05fe58fd RK |
554 | /* When extending inode, nilfs->ns_inode_size should be checked |
555 | for substitutions of appended fields */ | |
556 | } | |
557 | ||
558 | void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh) | |
559 | { | |
560 | ino_t ino = inode->i_ino; | |
561 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
562 | struct super_block *sb = inode->i_sb; | |
563 | struct nilfs_sb_info *sbi = NILFS_SB(sb); | |
564 | struct nilfs_inode *raw_inode; | |
565 | ||
566 | raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, ibh); | |
567 | ||
05fe58fd RK |
568 | if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state)) |
569 | memset(raw_inode, 0, NILFS_MDT(sbi->s_ifile)->mi_entry_size); | |
570 | set_bit(NILFS_I_INODE_DIRTY, &ii->i_state); | |
571 | ||
572 | nilfs_write_inode_common(inode, raw_inode, 0); | |
573 | /* XXX: call with has_bmap = 0 is a workaround to avoid | |
574 | deadlock of bmap. This delays update of i_bmap to just | |
575 | before writing */ | |
576 | nilfs_ifile_unmap_inode(sbi->s_ifile, ino, ibh); | |
577 | } | |
578 | ||
579 | #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */ | |
580 | ||
581 | static void nilfs_truncate_bmap(struct nilfs_inode_info *ii, | |
582 | unsigned long from) | |
583 | { | |
584 | unsigned long b; | |
585 | int ret; | |
586 | ||
587 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
588 | return; | |
589 | repeat: | |
590 | ret = nilfs_bmap_last_key(ii->i_bmap, &b); | |
591 | if (ret == -ENOENT) | |
592 | return; | |
593 | else if (ret < 0) | |
594 | goto failed; | |
595 | ||
596 | if (b < from) | |
597 | return; | |
598 | ||
599 | b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from); | |
600 | ret = nilfs_bmap_truncate(ii->i_bmap, b); | |
601 | nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb); | |
602 | if (!ret || (ret == -ENOMEM && | |
603 | nilfs_bmap_truncate(ii->i_bmap, b) == 0)) | |
604 | goto repeat; | |
605 | ||
606 | failed: | |
607 | if (ret == -EINVAL) | |
608 | nilfs_error(ii->vfs_inode.i_sb, __func__, | |
609 | "bmap is broken (ino=%lu)", ii->vfs_inode.i_ino); | |
610 | else | |
611 | nilfs_warning(ii->vfs_inode.i_sb, __func__, | |
612 | "failed to truncate bmap (ino=%lu, err=%d)", | |
613 | ii->vfs_inode.i_ino, ret); | |
614 | } | |
615 | ||
616 | void nilfs_truncate(struct inode *inode) | |
617 | { | |
618 | unsigned long blkoff; | |
619 | unsigned int blocksize; | |
620 | struct nilfs_transaction_info ti; | |
621 | struct super_block *sb = inode->i_sb; | |
622 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
05fe58fd RK |
623 | |
624 | if (!test_bit(NILFS_I_BMAP, &ii->i_state)) | |
625 | return; | |
626 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
627 | return; | |
628 | ||
629 | blocksize = sb->s_blocksize; | |
630 | blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits; | |
1f5abe7e | 631 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
05fe58fd RK |
632 | |
633 | block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block); | |
634 | ||
635 | nilfs_truncate_bmap(ii, blkoff); | |
636 | ||
637 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
638 | if (IS_SYNC(inode)) | |
639 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
640 | ||
abdb318b | 641 | nilfs_mark_inode_dirty(inode); |
05fe58fd | 642 | nilfs_set_file_dirty(NILFS_SB(sb), inode, 0); |
47420c79 | 643 | nilfs_transaction_commit(sb); |
05fe58fd RK |
644 | /* May construct a logical segment and may fail in sync mode. |
645 | But truncate has no return value. */ | |
646 | } | |
647 | ||
6fd1e5c9 AV |
648 | static void nilfs_clear_inode(struct inode *inode) |
649 | { | |
650 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
651 | ||
652 | /* | |
653 | * Free resources allocated in nilfs_read_inode(), here. | |
654 | */ | |
655 | BUG_ON(!list_empty(&ii->i_dirty)); | |
656 | brelse(ii->i_bh); | |
657 | ii->i_bh = NULL; | |
658 | ||
659 | if (test_bit(NILFS_I_BMAP, &ii->i_state)) | |
660 | nilfs_bmap_clear(ii->i_bmap); | |
661 | ||
662 | nilfs_btnode_cache_clear(&ii->i_btnode_cache); | |
663 | } | |
664 | ||
665 | void nilfs_evict_inode(struct inode *inode) | |
05fe58fd RK |
666 | { |
667 | struct nilfs_transaction_info ti; | |
668 | struct super_block *sb = inode->i_sb; | |
669 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
05fe58fd | 670 | |
6fd1e5c9 | 671 | if (inode->i_nlink || unlikely(is_bad_inode(inode))) { |
05fe58fd RK |
672 | if (inode->i_data.nrpages) |
673 | truncate_inode_pages(&inode->i_data, 0); | |
6fd1e5c9 AV |
674 | end_writeback(inode); |
675 | nilfs_clear_inode(inode); | |
05fe58fd RK |
676 | return; |
677 | } | |
1f5abe7e RK |
678 | nilfs_transaction_begin(sb, &ti, 0); /* never fails */ |
679 | ||
05fe58fd RK |
680 | if (inode->i_data.nrpages) |
681 | truncate_inode_pages(&inode->i_data, 0); | |
682 | ||
683 | nilfs_truncate_bmap(ii, 0); | |
abdb318b | 684 | nilfs_mark_inode_dirty(inode); |
6fd1e5c9 AV |
685 | end_writeback(inode); |
686 | nilfs_clear_inode(inode); | |
05fe58fd RK |
687 | nilfs_free_inode(inode); |
688 | /* nilfs_free_inode() marks inode buffer dirty */ | |
689 | if (IS_SYNC(inode)) | |
690 | nilfs_set_transaction_flag(NILFS_TI_SYNC); | |
47420c79 | 691 | nilfs_transaction_commit(sb); |
05fe58fd RK |
692 | /* May construct a logical segment and may fail in sync mode. |
693 | But delete_inode has no return value. */ | |
694 | } | |
695 | ||
696 | int nilfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
697 | { | |
698 | struct nilfs_transaction_info ti; | |
699 | struct inode *inode = dentry->d_inode; | |
700 | struct super_block *sb = inode->i_sb; | |
47420c79 | 701 | int err; |
05fe58fd RK |
702 | |
703 | err = inode_change_ok(inode, iattr); | |
704 | if (err) | |
705 | return err; | |
706 | ||
707 | err = nilfs_transaction_begin(sb, &ti, 0); | |
708 | if (unlikely(err)) | |
709 | return err; | |
1025774c CH |
710 | |
711 | if ((iattr->ia_valid & ATTR_SIZE) && | |
712 | iattr->ia_size != i_size_read(inode)) { | |
713 | err = vmtruncate(inode, iattr->ia_size); | |
714 | if (unlikely(err)) | |
715 | goto out_err; | |
716 | } | |
717 | ||
718 | setattr_copy(inode, iattr); | |
719 | mark_inode_dirty(inode); | |
720 | ||
721 | if (iattr->ia_valid & ATTR_MODE) { | |
05fe58fd | 722 | err = nilfs_acl_chmod(inode); |
1025774c CH |
723 | if (unlikely(err)) |
724 | goto out_err; | |
725 | } | |
726 | ||
727 | return nilfs_transaction_commit(sb); | |
47420c79 | 728 | |
1025774c CH |
729 | out_err: |
730 | nilfs_transaction_abort(sb); | |
47420c79 | 731 | return err; |
05fe58fd RK |
732 | } |
733 | ||
734 | int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode, | |
735 | struct buffer_head **pbh) | |
736 | { | |
737 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
738 | int err; | |
739 | ||
740 | spin_lock(&sbi->s_inode_lock); | |
05fe58fd RK |
741 | if (ii->i_bh == NULL) { |
742 | spin_unlock(&sbi->s_inode_lock); | |
743 | err = nilfs_ifile_get_inode_block(sbi->s_ifile, inode->i_ino, | |
744 | pbh); | |
745 | if (unlikely(err)) | |
746 | return err; | |
747 | spin_lock(&sbi->s_inode_lock); | |
748 | if (ii->i_bh == NULL) | |
749 | ii->i_bh = *pbh; | |
750 | else { | |
751 | brelse(*pbh); | |
752 | *pbh = ii->i_bh; | |
753 | } | |
754 | } else | |
755 | *pbh = ii->i_bh; | |
756 | ||
757 | get_bh(*pbh); | |
758 | spin_unlock(&sbi->s_inode_lock); | |
759 | return 0; | |
760 | } | |
761 | ||
762 | int nilfs_inode_dirty(struct inode *inode) | |
763 | { | |
764 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
765 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
766 | int ret = 0; | |
767 | ||
768 | if (!list_empty(&ii->i_dirty)) { | |
769 | spin_lock(&sbi->s_inode_lock); | |
770 | ret = test_bit(NILFS_I_DIRTY, &ii->i_state) || | |
771 | test_bit(NILFS_I_BUSY, &ii->i_state); | |
772 | spin_unlock(&sbi->s_inode_lock); | |
773 | } | |
774 | return ret; | |
775 | } | |
776 | ||
777 | int nilfs_set_file_dirty(struct nilfs_sb_info *sbi, struct inode *inode, | |
778 | unsigned nr_dirty) | |
779 | { | |
780 | struct nilfs_inode_info *ii = NILFS_I(inode); | |
781 | ||
782 | atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks); | |
783 | ||
458c5b08 | 784 | if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state)) |
05fe58fd RK |
785 | return 0; |
786 | ||
787 | spin_lock(&sbi->s_inode_lock); | |
788 | if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && | |
789 | !test_bit(NILFS_I_BUSY, &ii->i_state)) { | |
790 | /* Because this routine may race with nilfs_dispose_list(), | |
791 | we have to check NILFS_I_QUEUED here, too. */ | |
792 | if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) { | |
793 | /* This will happen when somebody is freeing | |
794 | this inode. */ | |
795 | nilfs_warning(sbi->s_super, __func__, | |
796 | "cannot get inode (ino=%lu)\n", | |
797 | inode->i_ino); | |
798 | spin_unlock(&sbi->s_inode_lock); | |
799 | return -EINVAL; /* NILFS_I_DIRTY may remain for | |
800 | freeing inode */ | |
801 | } | |
802 | list_del(&ii->i_dirty); | |
803 | list_add_tail(&ii->i_dirty, &sbi->s_dirty_files); | |
804 | set_bit(NILFS_I_QUEUED, &ii->i_state); | |
805 | } | |
806 | spin_unlock(&sbi->s_inode_lock); | |
807 | return 0; | |
808 | } | |
809 | ||
810 | int nilfs_mark_inode_dirty(struct inode *inode) | |
811 | { | |
812 | struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); | |
813 | struct buffer_head *ibh; | |
814 | int err; | |
815 | ||
816 | err = nilfs_load_inode_block(sbi, inode, &ibh); | |
817 | if (unlikely(err)) { | |
818 | nilfs_warning(inode->i_sb, __func__, | |
819 | "failed to reget inode block.\n"); | |
820 | return err; | |
821 | } | |
05fe58fd | 822 | nilfs_update_inode(inode, ibh); |
05fe58fd RK |
823 | nilfs_mdt_mark_buffer_dirty(ibh); |
824 | nilfs_mdt_mark_dirty(sbi->s_ifile); | |
825 | brelse(ibh); | |
826 | return 0; | |
827 | } | |
828 | ||
829 | /** | |
830 | * nilfs_dirty_inode - reflect changes on given inode to an inode block. | |
831 | * @inode: inode of the file to be registered. | |
832 | * | |
833 | * nilfs_dirty_inode() loads a inode block containing the specified | |
834 | * @inode and copies data from a nilfs_inode to a corresponding inode | |
835 | * entry in the inode block. This operation is excluded from the segment | |
836 | * construction. This function can be called both as a single operation | |
837 | * and as a part of indivisible file operations. | |
838 | */ | |
839 | void nilfs_dirty_inode(struct inode *inode) | |
840 | { | |
841 | struct nilfs_transaction_info ti; | |
7d6cd92f | 842 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
05fe58fd RK |
843 | |
844 | if (is_bad_inode(inode)) { | |
845 | nilfs_warning(inode->i_sb, __func__, | |
846 | "tried to mark bad_inode dirty. ignored.\n"); | |
847 | dump_stack(); | |
848 | return; | |
849 | } | |
7d6cd92f RK |
850 | if (mdi) { |
851 | nilfs_mdt_mark_dirty(inode); | |
852 | return; | |
853 | } | |
05fe58fd | 854 | nilfs_transaction_begin(inode->i_sb, &ti, 0); |
458c5b08 | 855 | nilfs_mark_inode_dirty(inode); |
47420c79 | 856 | nilfs_transaction_commit(inode->i_sb); /* never fails */ |
05fe58fd | 857 | } |