Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (C) International Business Machines Corp., 2000-2004 | |
3 | * Portions Copyright (C) Christoph Hellwig, 2001-2002 | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
63f83c9f | 7 | * the Free Software Foundation; either version 2 of the License, or |
1da177e4 | 8 | * (at your option) any later version. |
63f83c9f | 9 | * |
1da177e4 LT |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
13 | * the GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
63f83c9f | 16 | * along with this program; if not, write to the Free Software |
1da177e4 LT |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ | |
19 | ||
20 | #include <linux/fs.h> | |
21 | #include <linux/mpage.h> | |
22 | #include <linux/buffer_head.h> | |
23 | #include <linux/pagemap.h> | |
24 | #include <linux/quotaops.h> | |
a9185b41 | 25 | #include <linux/writeback.h> |
a27bb332 | 26 | #include <linux/aio.h> |
1da177e4 | 27 | #include "jfs_incore.h" |
1868f4aa | 28 | #include "jfs_inode.h" |
1da177e4 LT |
29 | #include "jfs_filsys.h" |
30 | #include "jfs_imap.h" | |
31 | #include "jfs_extent.h" | |
32 | #include "jfs_unicode.h" | |
33 | #include "jfs_debug.h" | |
34 | ||
35 | ||
eab1df71 | 36 | struct inode *jfs_iget(struct super_block *sb, unsigned long ino) |
1da177e4 | 37 | { |
eab1df71 DH |
38 | struct inode *inode; |
39 | int ret; | |
40 | ||
41 | inode = iget_locked(sb, ino); | |
42 | if (!inode) | |
43 | return ERR_PTR(-ENOMEM); | |
44 | if (!(inode->i_state & I_NEW)) | |
45 | return inode; | |
46 | ||
47 | ret = diRead(inode); | |
48 | if (ret < 0) { | |
49 | iget_failed(inode); | |
50 | return ERR_PTR(ret); | |
1da177e4 LT |
51 | } |
52 | ||
53 | if (S_ISREG(inode->i_mode)) { | |
54 | inode->i_op = &jfs_file_inode_operations; | |
55 | inode->i_fop = &jfs_file_operations; | |
56 | inode->i_mapping->a_ops = &jfs_aops; | |
57 | } else if (S_ISDIR(inode->i_mode)) { | |
58 | inode->i_op = &jfs_dir_inode_operations; | |
59 | inode->i_fop = &jfs_dir_operations; | |
60 | } else if (S_ISLNK(inode->i_mode)) { | |
61 | if (inode->i_size >= IDATASIZE) { | |
62 | inode->i_op = &page_symlink_inode_operations; | |
63 | inode->i_mapping->a_ops = &jfs_aops; | |
d69e83d9 | 64 | } else { |
c7f2e1f0 | 65 | inode->i_op = &jfs_fast_symlink_inode_operations; |
d69e83d9 DK |
66 | /* |
67 | * The inline data should be null-terminated, but | |
68 | * don't let on-disk corruption crash the kernel | |
69 | */ | |
70 | JFS_IP(inode)->i_inline[inode->i_size] = '\0'; | |
71 | } | |
1da177e4 LT |
72 | } else { |
73 | inode->i_op = &jfs_file_inode_operations; | |
74 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
75 | } | |
eab1df71 DH |
76 | unlock_new_inode(inode); |
77 | return inode; | |
1da177e4 LT |
78 | } |
79 | ||
80 | /* | |
81 | * Workhorse of both fsync & write_inode | |
82 | */ | |
83 | int jfs_commit_inode(struct inode *inode, int wait) | |
84 | { | |
85 | int rc = 0; | |
86 | tid_t tid; | |
87 | static int noisy = 5; | |
88 | ||
89 | jfs_info("In jfs_commit_inode, inode = 0x%p", inode); | |
90 | ||
91 | /* | |
92 | * Don't commit if inode has been committed since last being | |
93 | * marked dirty, or if it has been deleted. | |
94 | */ | |
95 | if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode)) | |
96 | return 0; | |
97 | ||
98 | if (isReadOnly(inode)) { | |
99 | /* kernel allows writes to devices on read-only | |
100 | * partitions and may think inode is dirty | |
101 | */ | |
102 | if (!special_file(inode->i_mode) && noisy) { | |
103 | jfs_err("jfs_commit_inode(0x%p) called on " | |
104 | "read-only volume", inode); | |
105 | jfs_err("Is remount racy?"); | |
106 | noisy--; | |
107 | } | |
108 | return 0; | |
109 | } | |
110 | ||
111 | tid = txBegin(inode->i_sb, COMMIT_INODE); | |
1de87444 | 112 | mutex_lock(&JFS_IP(inode)->commit_mutex); |
1da177e4 LT |
113 | |
114 | /* | |
1de87444 | 115 | * Retest inode state after taking commit_mutex |
1da177e4 LT |
116 | */ |
117 | if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode)) | |
118 | rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0); | |
119 | ||
120 | txEnd(tid); | |
1de87444 | 121 | mutex_unlock(&JFS_IP(inode)->commit_mutex); |
1da177e4 LT |
122 | return rc; |
123 | } | |
124 | ||
a9185b41 | 125 | int jfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1da177e4 | 126 | { |
a9185b41 CH |
127 | int wait = wbc->sync_mode == WB_SYNC_ALL; |
128 | ||
73aaa22d | 129 | if (inode->i_nlink == 0) |
1da177e4 LT |
130 | return 0; |
131 | /* | |
132 | * If COMMIT_DIRTY is not set, the inode isn't really dirty. | |
133 | * It has been committed since the last change, but was still | |
134 | * on the dirty inode list. | |
135 | */ | |
136 | if (!test_cflag(COMMIT_Dirty, inode)) { | |
137 | /* Make sure committed changes hit the disk */ | |
138 | jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait); | |
139 | return 0; | |
140 | } | |
141 | ||
142 | if (jfs_commit_inode(inode, wait)) { | |
143 | jfs_err("jfs_write_inode: jfs_commit_inode failed!"); | |
144 | return -EIO; | |
145 | } else | |
146 | return 0; | |
147 | } | |
148 | ||
62aff86f | 149 | void jfs_evict_inode(struct inode *inode) |
1da177e4 | 150 | { |
62aff86f | 151 | jfs_info("In jfs_evict_inode, inode = 0x%p", inode); |
1da177e4 | 152 | |
62aff86f | 153 | if (!inode->i_nlink && !is_bad_inode(inode)) { |
871a2931 | 154 | dquot_initialize(inode); |
907f4554 | 155 | |
62aff86f | 156 | if (JFS_IP(inode)->fileset == FILESYSTEM_I) { |
91b0abe3 | 157 | truncate_inode_pages_final(&inode->i_data); |
fef26658 | 158 | |
62aff86f AV |
159 | if (test_cflag(COMMIT_Freewmap, inode)) |
160 | jfs_free_zero_link(inode); | |
1da177e4 | 161 | |
62aff86f | 162 | diFree(inode); |
1da177e4 | 163 | |
62aff86f AV |
164 | /* |
165 | * Free the inode from the quota allocation. | |
166 | */ | |
167 | dquot_initialize(inode); | |
168 | dquot_free_inode(inode); | |
169 | } | |
170 | } else { | |
91b0abe3 | 171 | truncate_inode_pages_final(&inode->i_data); |
b1b5d7f9 | 172 | } |
dbd5768f | 173 | clear_inode(inode); |
62aff86f | 174 | dquot_drop(inode); |
1da177e4 LT |
175 | } |
176 | ||
aa385729 | 177 | void jfs_dirty_inode(struct inode *inode, int flags) |
1da177e4 LT |
178 | { |
179 | static int noisy = 5; | |
180 | ||
181 | if (isReadOnly(inode)) { | |
182 | if (!special_file(inode->i_mode) && noisy) { | |
183 | /* kernel allows writes to devices on read-only | |
184 | * partitions and may try to mark inode dirty | |
185 | */ | |
186 | jfs_err("jfs_dirty_inode called on read-only volume"); | |
187 | jfs_err("Is remount racy?"); | |
188 | noisy--; | |
189 | } | |
190 | return; | |
191 | } | |
192 | ||
193 | set_cflag(COMMIT_Dirty, inode); | |
194 | } | |
195 | ||
115ff50b DK |
196 | int jfs_get_block(struct inode *ip, sector_t lblock, |
197 | struct buffer_head *bh_result, int create) | |
1da177e4 LT |
198 | { |
199 | s64 lblock64 = lblock; | |
200 | int rc = 0; | |
1da177e4 LT |
201 | xad_t xad; |
202 | s64 xaddr; | |
203 | int xflag; | |
115ff50b | 204 | s32 xlen = bh_result->b_size >> ip->i_blkbits; |
1da177e4 | 205 | |
1da177e4 LT |
206 | /* |
207 | * Take appropriate lock on inode | |
208 | */ | |
7fab479b | 209 | if (create) |
82d5b9a7 | 210 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
7fab479b | 211 | else |
82d5b9a7 | 212 | IREAD_LOCK(ip, RDWRLOCK_NORMAL); |
1da177e4 LT |
213 | |
214 | if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) && | |
115ff50b | 215 | (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) && |
6628465e | 216 | xaddr) { |
1da177e4 LT |
217 | if (xflag & XAD_NOTRECORDED) { |
218 | if (!create) | |
219 | /* | |
220 | * Allocated but not recorded, read treats | |
221 | * this as a hole | |
222 | */ | |
223 | goto unlock; | |
224 | #ifdef _JFS_4K | |
225 | XADoffset(&xad, lblock64); | |
226 | XADlength(&xad, xlen); | |
227 | XADaddress(&xad, xaddr); | |
228 | #else /* _JFS_4K */ | |
229 | /* | |
230 | * As long as block size = 4K, this isn't a problem. | |
231 | * We should mark the whole page not ABNR, but how | |
232 | * will we know to mark the other blocks BH_New? | |
233 | */ | |
234 | BUG(); | |
235 | #endif /* _JFS_4K */ | |
236 | rc = extRecord(ip, &xad); | |
237 | if (rc) | |
238 | goto unlock; | |
239 | set_buffer_new(bh_result); | |
240 | } | |
241 | ||
242 | map_bh(bh_result, ip->i_sb, xaddr); | |
243 | bh_result->b_size = xlen << ip->i_blkbits; | |
244 | goto unlock; | |
245 | } | |
246 | if (!create) | |
247 | goto unlock; | |
248 | ||
249 | /* | |
250 | * Allocate a new block | |
251 | */ | |
252 | #ifdef _JFS_4K | |
253 | if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad))) | |
254 | goto unlock; | |
4d81715f | 255 | rc = extAlloc(ip, xlen, lblock64, &xad, false); |
1da177e4 LT |
256 | if (rc) |
257 | goto unlock; | |
258 | ||
259 | set_buffer_new(bh_result); | |
260 | map_bh(bh_result, ip->i_sb, addressXAD(&xad)); | |
261 | bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits; | |
262 | ||
263 | #else /* _JFS_4K */ | |
264 | /* | |
265 | * We need to do whatever it takes to keep all but the last buffers | |
266 | * in 4K pages - see jfs_write.c | |
267 | */ | |
268 | BUG(); | |
269 | #endif /* _JFS_4K */ | |
270 | ||
271 | unlock: | |
272 | /* | |
273 | * Release lock on inode | |
274 | */ | |
7fab479b DK |
275 | if (create) |
276 | IWRITE_UNLOCK(ip); | |
277 | else | |
278 | IREAD_UNLOCK(ip); | |
1da177e4 LT |
279 | return rc; |
280 | } | |
281 | ||
1da177e4 LT |
282 | static int jfs_writepage(struct page *page, struct writeback_control *wbc) |
283 | { | |
d5c5f84b | 284 | return block_write_full_page(page, jfs_get_block, wbc); |
1da177e4 LT |
285 | } |
286 | ||
287 | static int jfs_writepages(struct address_space *mapping, | |
288 | struct writeback_control *wbc) | |
289 | { | |
290 | return mpage_writepages(mapping, wbc, jfs_get_block); | |
291 | } | |
292 | ||
293 | static int jfs_readpage(struct file *file, struct page *page) | |
294 | { | |
295 | return mpage_readpage(page, jfs_get_block); | |
296 | } | |
297 | ||
298 | static int jfs_readpages(struct file *file, struct address_space *mapping, | |
299 | struct list_head *pages, unsigned nr_pages) | |
300 | { | |
301 | return mpage_readpages(mapping, pages, nr_pages, jfs_get_block); | |
302 | } | |
303 | ||
86dd07d6 MS |
304 | static void jfs_write_failed(struct address_space *mapping, loff_t to) |
305 | { | |
306 | struct inode *inode = mapping->host; | |
307 | ||
308 | if (to > inode->i_size) { | |
7caef267 | 309 | truncate_pagecache(inode, inode->i_size); |
86dd07d6 MS |
310 | jfs_truncate(inode); |
311 | } | |
312 | } | |
313 | ||
d5c5f84b NP |
314 | static int jfs_write_begin(struct file *file, struct address_space *mapping, |
315 | loff_t pos, unsigned len, unsigned flags, | |
316 | struct page **pagep, void **fsdata) | |
1da177e4 | 317 | { |
ea0f04e5 CH |
318 | int ret; |
319 | ||
320 | ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata, | |
d5c5f84b | 321 | jfs_get_block); |
86dd07d6 MS |
322 | if (unlikely(ret)) |
323 | jfs_write_failed(mapping, pos + len); | |
ea0f04e5 CH |
324 | |
325 | return ret; | |
1da177e4 LT |
326 | } |
327 | ||
328 | static sector_t jfs_bmap(struct address_space *mapping, sector_t block) | |
329 | { | |
330 | return generic_block_bmap(mapping, block, jfs_get_block); | |
331 | } | |
332 | ||
333 | static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb, | |
d8d3d94b | 334 | struct iov_iter *iter, loff_t offset) |
1da177e4 LT |
335 | { |
336 | struct file *file = iocb->ki_filp; | |
86dd07d6 | 337 | struct address_space *mapping = file->f_mapping; |
1da177e4 | 338 | struct inode *inode = file->f_mapping->host; |
a6cbcd4a | 339 | size_t count = iov_iter_count(iter); |
eafdc7d1 | 340 | ssize_t ret; |
1da177e4 | 341 | |
31b14039 | 342 | ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, jfs_get_block); |
eafdc7d1 CH |
343 | |
344 | /* | |
345 | * In case of error extending write may have instantiated a few | |
346 | * blocks outside i_size. Trim these off again. | |
347 | */ | |
348 | if (unlikely((rw & WRITE) && ret < 0)) { | |
349 | loff_t isize = i_size_read(inode); | |
a6cbcd4a | 350 | loff_t end = offset + count; |
eafdc7d1 CH |
351 | |
352 | if (end > isize) | |
86dd07d6 | 353 | jfs_write_failed(mapping, end); |
eafdc7d1 CH |
354 | } |
355 | ||
356 | return ret; | |
1da177e4 LT |
357 | } |
358 | ||
f5e54d6e | 359 | const struct address_space_operations jfs_aops = { |
1da177e4 LT |
360 | .readpage = jfs_readpage, |
361 | .readpages = jfs_readpages, | |
362 | .writepage = jfs_writepage, | |
363 | .writepages = jfs_writepages, | |
d5c5f84b | 364 | .write_begin = jfs_write_begin, |
03158cd7 | 365 | .write_end = nobh_write_end, |
1da177e4 LT |
366 | .bmap = jfs_bmap, |
367 | .direct_IO = jfs_direct_IO, | |
368 | }; | |
369 | ||
370 | /* | |
371 | * Guts of jfs_truncate. Called with locks already held. Can be called | |
372 | * with directory for truncating directory index table. | |
373 | */ | |
374 | void jfs_truncate_nolock(struct inode *ip, loff_t length) | |
375 | { | |
376 | loff_t newsize; | |
377 | tid_t tid; | |
378 | ||
379 | ASSERT(length >= 0); | |
380 | ||
381 | if (test_cflag(COMMIT_Nolink, ip)) { | |
382 | xtTruncate(0, ip, length, COMMIT_WMAP); | |
383 | return; | |
384 | } | |
385 | ||
386 | do { | |
387 | tid = txBegin(ip->i_sb, 0); | |
388 | ||
389 | /* | |
1de87444 | 390 | * The commit_mutex cannot be taken before txBegin. |
1da177e4 LT |
391 | * txBegin may block and there is a chance the inode |
392 | * could be marked dirty and need to be committed | |
393 | * before txBegin unblocks | |
394 | */ | |
1de87444 | 395 | mutex_lock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
396 | |
397 | newsize = xtTruncate(tid, ip, length, | |
398 | COMMIT_TRUNCATE | COMMIT_PWMAP); | |
399 | if (newsize < 0) { | |
400 | txEnd(tid); | |
1de87444 | 401 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
402 | break; |
403 | } | |
404 | ||
405 | ip->i_mtime = ip->i_ctime = CURRENT_TIME; | |
406 | mark_inode_dirty(ip); | |
407 | ||
408 | txCommit(tid, 1, &ip, 0); | |
409 | txEnd(tid); | |
1de87444 | 410 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
411 | } while (newsize > length); /* Truncate isn't always atomic */ |
412 | } | |
413 | ||
414 | void jfs_truncate(struct inode *ip) | |
415 | { | |
416 | jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size); | |
417 | ||
03158cd7 | 418 | nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block); |
1da177e4 | 419 | |
82d5b9a7 | 420 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
1da177e4 LT |
421 | jfs_truncate_nolock(ip, ip->i_size); |
422 | IWRITE_UNLOCK(ip); | |
423 | } |