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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> | |
e2e40f2c | 25 | #include <linux/uio.h> |
a9185b41 | 26 | #include <linux/writeback.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; | |
21fc61c7 | 63 | inode_nohighmem(inode); |
1da177e4 | 64 | inode->i_mapping->a_ops = &jfs_aops; |
d69e83d9 | 65 | } else { |
c7f2e1f0 | 66 | inode->i_op = &jfs_fast_symlink_inode_operations; |
ad476fed | 67 | inode->i_link = JFS_IP(inode)->i_inline; |
d69e83d9 DK |
68 | /* |
69 | * The inline data should be null-terminated, but | |
70 | * don't let on-disk corruption crash the kernel | |
71 | */ | |
ad476fed | 72 | inode->i_link[inode->i_size] = '\0'; |
d69e83d9 | 73 | } |
1da177e4 LT |
74 | } else { |
75 | inode->i_op = &jfs_file_inode_operations; | |
76 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
77 | } | |
eab1df71 DH |
78 | unlock_new_inode(inode); |
79 | return inode; | |
1da177e4 LT |
80 | } |
81 | ||
82 | /* | |
83 | * Workhorse of both fsync & write_inode | |
84 | */ | |
85 | int jfs_commit_inode(struct inode *inode, int wait) | |
86 | { | |
87 | int rc = 0; | |
88 | tid_t tid; | |
89 | static int noisy = 5; | |
90 | ||
91 | jfs_info("In jfs_commit_inode, inode = 0x%p", inode); | |
92 | ||
93 | /* | |
94 | * Don't commit if inode has been committed since last being | |
95 | * marked dirty, or if it has been deleted. | |
96 | */ | |
97 | if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode)) | |
98 | return 0; | |
99 | ||
100 | if (isReadOnly(inode)) { | |
101 | /* kernel allows writes to devices on read-only | |
102 | * partitions and may think inode is dirty | |
103 | */ | |
104 | if (!special_file(inode->i_mode) && noisy) { | |
6ed71e98 JP |
105 | jfs_err("jfs_commit_inode(0x%p) called on read-only volume", |
106 | inode); | |
1da177e4 LT |
107 | jfs_err("Is remount racy?"); |
108 | noisy--; | |
109 | } | |
110 | return 0; | |
111 | } | |
112 | ||
113 | tid = txBegin(inode->i_sb, COMMIT_INODE); | |
1de87444 | 114 | mutex_lock(&JFS_IP(inode)->commit_mutex); |
1da177e4 LT |
115 | |
116 | /* | |
1de87444 | 117 | * Retest inode state after taking commit_mutex |
1da177e4 LT |
118 | */ |
119 | if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode)) | |
120 | rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0); | |
121 | ||
122 | txEnd(tid); | |
1de87444 | 123 | mutex_unlock(&JFS_IP(inode)->commit_mutex); |
1da177e4 LT |
124 | return rc; |
125 | } | |
126 | ||
a9185b41 | 127 | int jfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1da177e4 | 128 | { |
a9185b41 CH |
129 | int wait = wbc->sync_mode == WB_SYNC_ALL; |
130 | ||
73aaa22d | 131 | if (inode->i_nlink == 0) |
1da177e4 LT |
132 | return 0; |
133 | /* | |
134 | * If COMMIT_DIRTY is not set, the inode isn't really dirty. | |
135 | * It has been committed since the last change, but was still | |
136 | * on the dirty inode list. | |
137 | */ | |
f7f31adf | 138 | if (!test_cflag(COMMIT_Dirty, inode)) { |
1da177e4 LT |
139 | /* Make sure committed changes hit the disk */ |
140 | jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait); | |
141 | return 0; | |
f7f31adf | 142 | } |
1da177e4 LT |
143 | |
144 | if (jfs_commit_inode(inode, wait)) { | |
145 | jfs_err("jfs_write_inode: jfs_commit_inode failed!"); | |
146 | return -EIO; | |
147 | } else | |
148 | return 0; | |
149 | } | |
150 | ||
62aff86f | 151 | void jfs_evict_inode(struct inode *inode) |
1da177e4 | 152 | { |
62aff86f | 153 | jfs_info("In jfs_evict_inode, inode = 0x%p", inode); |
1da177e4 | 154 | |
62aff86f | 155 | if (!inode->i_nlink && !is_bad_inode(inode)) { |
871a2931 | 156 | dquot_initialize(inode); |
907f4554 | 157 | |
62aff86f | 158 | if (JFS_IP(inode)->fileset == FILESYSTEM_I) { |
91b0abe3 | 159 | truncate_inode_pages_final(&inode->i_data); |
fef26658 | 160 | |
62aff86f AV |
161 | if (test_cflag(COMMIT_Freewmap, inode)) |
162 | jfs_free_zero_link(inode); | |
1da177e4 | 163 | |
62aff86f | 164 | diFree(inode); |
1da177e4 | 165 | |
62aff86f AV |
166 | /* |
167 | * Free the inode from the quota allocation. | |
168 | */ | |
62aff86f AV |
169 | dquot_free_inode(inode); |
170 | } | |
171 | } else { | |
91b0abe3 | 172 | truncate_inode_pages_final(&inode->i_data); |
b1b5d7f9 | 173 | } |
dbd5768f | 174 | clear_inode(inode); |
62aff86f | 175 | dquot_drop(inode); |
1da177e4 LT |
176 | } |
177 | ||
aa385729 | 178 | void jfs_dirty_inode(struct inode *inode, int flags) |
1da177e4 LT |
179 | { |
180 | static int noisy = 5; | |
181 | ||
182 | if (isReadOnly(inode)) { | |
183 | if (!special_file(inode->i_mode) && noisy) { | |
184 | /* kernel allows writes to devices on read-only | |
185 | * partitions and may try to mark inode dirty | |
186 | */ | |
187 | jfs_err("jfs_dirty_inode called on read-only volume"); | |
188 | jfs_err("Is remount racy?"); | |
189 | noisy--; | |
190 | } | |
191 | return; | |
192 | } | |
193 | ||
194 | set_cflag(COMMIT_Dirty, inode); | |
195 | } | |
196 | ||
115ff50b DK |
197 | int jfs_get_block(struct inode *ip, sector_t lblock, |
198 | struct buffer_head *bh_result, int create) | |
1da177e4 LT |
199 | { |
200 | s64 lblock64 = lblock; | |
201 | int rc = 0; | |
1da177e4 LT |
202 | xad_t xad; |
203 | s64 xaddr; | |
204 | int xflag; | |
115ff50b | 205 | s32 xlen = bh_result->b_size >> ip->i_blkbits; |
1da177e4 | 206 | |
1da177e4 LT |
207 | /* |
208 | * Take appropriate lock on inode | |
209 | */ | |
7fab479b | 210 | if (create) |
82d5b9a7 | 211 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
7fab479b | 212 | else |
82d5b9a7 | 213 | IREAD_LOCK(ip, RDWRLOCK_NORMAL); |
1da177e4 LT |
214 | |
215 | if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) && | |
115ff50b | 216 | (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) && |
6628465e | 217 | xaddr) { |
1da177e4 LT |
218 | if (xflag & XAD_NOTRECORDED) { |
219 | if (!create) | |
220 | /* | |
221 | * Allocated but not recorded, read treats | |
222 | * this as a hole | |
223 | */ | |
224 | goto unlock; | |
225 | #ifdef _JFS_4K | |
226 | XADoffset(&xad, lblock64); | |
227 | XADlength(&xad, xlen); | |
228 | XADaddress(&xad, xaddr); | |
229 | #else /* _JFS_4K */ | |
230 | /* | |
231 | * As long as block size = 4K, this isn't a problem. | |
232 | * We should mark the whole page not ABNR, but how | |
233 | * will we know to mark the other blocks BH_New? | |
234 | */ | |
235 | BUG(); | |
236 | #endif /* _JFS_4K */ | |
237 | rc = extRecord(ip, &xad); | |
238 | if (rc) | |
239 | goto unlock; | |
240 | set_buffer_new(bh_result); | |
241 | } | |
242 | ||
243 | map_bh(bh_result, ip->i_sb, xaddr); | |
244 | bh_result->b_size = xlen << ip->i_blkbits; | |
245 | goto unlock; | |
246 | } | |
247 | if (!create) | |
248 | goto unlock; | |
249 | ||
250 | /* | |
251 | * Allocate a new block | |
252 | */ | |
253 | #ifdef _JFS_4K | |
254 | if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad))) | |
255 | goto unlock; | |
4d81715f | 256 | rc = extAlloc(ip, xlen, lblock64, &xad, false); |
1da177e4 LT |
257 | if (rc) |
258 | goto unlock; | |
259 | ||
260 | set_buffer_new(bh_result); | |
261 | map_bh(bh_result, ip->i_sb, addressXAD(&xad)); | |
262 | bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits; | |
263 | ||
264 | #else /* _JFS_4K */ | |
265 | /* | |
266 | * We need to do whatever it takes to keep all but the last buffers | |
267 | * in 4K pages - see jfs_write.c | |
268 | */ | |
269 | BUG(); | |
270 | #endif /* _JFS_4K */ | |
271 | ||
272 | unlock: | |
273 | /* | |
274 | * Release lock on inode | |
275 | */ | |
7fab479b DK |
276 | if (create) |
277 | IWRITE_UNLOCK(ip); | |
278 | else | |
279 | IREAD_UNLOCK(ip); | |
1da177e4 LT |
280 | return rc; |
281 | } | |
282 | ||
1da177e4 LT |
283 | static int jfs_writepage(struct page *page, struct writeback_control *wbc) |
284 | { | |
d5c5f84b | 285 | return block_write_full_page(page, jfs_get_block, wbc); |
1da177e4 LT |
286 | } |
287 | ||
288 | static int jfs_writepages(struct address_space *mapping, | |
289 | struct writeback_control *wbc) | |
290 | { | |
291 | return mpage_writepages(mapping, wbc, jfs_get_block); | |
292 | } | |
293 | ||
294 | static int jfs_readpage(struct file *file, struct page *page) | |
295 | { | |
296 | return mpage_readpage(page, jfs_get_block); | |
297 | } | |
298 | ||
299 | static int jfs_readpages(struct file *file, struct address_space *mapping, | |
300 | struct list_head *pages, unsigned nr_pages) | |
301 | { | |
302 | return mpage_readpages(mapping, pages, nr_pages, jfs_get_block); | |
303 | } | |
304 | ||
86dd07d6 MS |
305 | static void jfs_write_failed(struct address_space *mapping, loff_t to) |
306 | { | |
307 | struct inode *inode = mapping->host; | |
308 | ||
309 | if (to > inode->i_size) { | |
7caef267 | 310 | truncate_pagecache(inode, inode->i_size); |
86dd07d6 MS |
311 | jfs_truncate(inode); |
312 | } | |
313 | } | |
314 | ||
d5c5f84b NP |
315 | static int jfs_write_begin(struct file *file, struct address_space *mapping, |
316 | loff_t pos, unsigned len, unsigned flags, | |
317 | struct page **pagep, void **fsdata) | |
1da177e4 | 318 | { |
ea0f04e5 CH |
319 | int ret; |
320 | ||
321 | ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata, | |
d5c5f84b | 322 | jfs_get_block); |
86dd07d6 MS |
323 | if (unlikely(ret)) |
324 | jfs_write_failed(mapping, pos + len); | |
ea0f04e5 CH |
325 | |
326 | return ret; | |
1da177e4 LT |
327 | } |
328 | ||
329 | static sector_t jfs_bmap(struct address_space *mapping, sector_t block) | |
330 | { | |
331 | return generic_block_bmap(mapping, block, jfs_get_block); | |
332 | } | |
333 | ||
c8b8e32d | 334 | static ssize_t jfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
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 | |
c8b8e32d | 342 | ret = blockdev_direct_IO(iocb, inode, iter, 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 | */ | |
6f673763 | 348 | if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) { |
eafdc7d1 | 349 | loff_t isize = i_size_read(inode); |
c8b8e32d | 350 | loff_t end = iocb->ki_pos + 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 | ||
078cd827 | 405 | ip->i_mtime = ip->i_ctime = current_time(ip); |
1da177e4 LT |
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 | } |