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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> |
1da177e4 | 26 | #include "jfs_incore.h" |
1868f4aa | 27 | #include "jfs_inode.h" |
1da177e4 LT |
28 | #include "jfs_filsys.h" |
29 | #include "jfs_imap.h" | |
30 | #include "jfs_extent.h" | |
31 | #include "jfs_unicode.h" | |
32 | #include "jfs_debug.h" | |
33 | ||
34 | ||
eab1df71 | 35 | struct inode *jfs_iget(struct super_block *sb, unsigned long ino) |
1da177e4 | 36 | { |
eab1df71 DH |
37 | struct inode *inode; |
38 | int ret; | |
39 | ||
40 | inode = iget_locked(sb, ino); | |
41 | if (!inode) | |
42 | return ERR_PTR(-ENOMEM); | |
43 | if (!(inode->i_state & I_NEW)) | |
44 | return inode; | |
45 | ||
46 | ret = diRead(inode); | |
47 | if (ret < 0) { | |
48 | iget_failed(inode); | |
49 | return ERR_PTR(ret); | |
1da177e4 LT |
50 | } |
51 | ||
52 | if (S_ISREG(inode->i_mode)) { | |
53 | inode->i_op = &jfs_file_inode_operations; | |
54 | inode->i_fop = &jfs_file_operations; | |
55 | inode->i_mapping->a_ops = &jfs_aops; | |
56 | } else if (S_ISDIR(inode->i_mode)) { | |
57 | inode->i_op = &jfs_dir_inode_operations; | |
58 | inode->i_fop = &jfs_dir_operations; | |
59 | } else if (S_ISLNK(inode->i_mode)) { | |
60 | if (inode->i_size >= IDATASIZE) { | |
61 | inode->i_op = &page_symlink_inode_operations; | |
62 | inode->i_mapping->a_ops = &jfs_aops; | |
d69e83d9 | 63 | } else { |
c7f2e1f0 | 64 | inode->i_op = &jfs_fast_symlink_inode_operations; |
d69e83d9 DK |
65 | /* |
66 | * The inline data should be null-terminated, but | |
67 | * don't let on-disk corruption crash the kernel | |
68 | */ | |
69 | JFS_IP(inode)->i_inline[inode->i_size] = '\0'; | |
70 | } | |
1da177e4 LT |
71 | } else { |
72 | inode->i_op = &jfs_file_inode_operations; | |
73 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
74 | } | |
eab1df71 DH |
75 | unlock_new_inode(inode); |
76 | return inode; | |
1da177e4 LT |
77 | } |
78 | ||
79 | /* | |
80 | * Workhorse of both fsync & write_inode | |
81 | */ | |
82 | int jfs_commit_inode(struct inode *inode, int wait) | |
83 | { | |
84 | int rc = 0; | |
85 | tid_t tid; | |
86 | static int noisy = 5; | |
87 | ||
88 | jfs_info("In jfs_commit_inode, inode = 0x%p", inode); | |
89 | ||
90 | /* | |
91 | * Don't commit if inode has been committed since last being | |
92 | * marked dirty, or if it has been deleted. | |
93 | */ | |
94 | if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode)) | |
95 | return 0; | |
96 | ||
97 | if (isReadOnly(inode)) { | |
98 | /* kernel allows writes to devices on read-only | |
99 | * partitions and may think inode is dirty | |
100 | */ | |
101 | if (!special_file(inode->i_mode) && noisy) { | |
102 | jfs_err("jfs_commit_inode(0x%p) called on " | |
103 | "read-only volume", inode); | |
104 | jfs_err("Is remount racy?"); | |
105 | noisy--; | |
106 | } | |
107 | return 0; | |
108 | } | |
109 | ||
110 | tid = txBegin(inode->i_sb, COMMIT_INODE); | |
1de87444 | 111 | mutex_lock(&JFS_IP(inode)->commit_mutex); |
1da177e4 LT |
112 | |
113 | /* | |
1de87444 | 114 | * Retest inode state after taking commit_mutex |
1da177e4 LT |
115 | */ |
116 | if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode)) | |
117 | rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0); | |
118 | ||
119 | txEnd(tid); | |
1de87444 | 120 | mutex_unlock(&JFS_IP(inode)->commit_mutex); |
1da177e4 LT |
121 | return rc; |
122 | } | |
123 | ||
a9185b41 | 124 | int jfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1da177e4 | 125 | { |
a9185b41 CH |
126 | int wait = wbc->sync_mode == WB_SYNC_ALL; |
127 | ||
1da177e4 LT |
128 | if (test_cflag(COMMIT_Nolink, inode)) |
129 | return 0; | |
130 | /* | |
131 | * If COMMIT_DIRTY is not set, the inode isn't really dirty. | |
132 | * It has been committed since the last change, but was still | |
133 | * on the dirty inode list. | |
134 | */ | |
135 | if (!test_cflag(COMMIT_Dirty, inode)) { | |
136 | /* Make sure committed changes hit the disk */ | |
137 | jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait); | |
138 | return 0; | |
139 | } | |
140 | ||
141 | if (jfs_commit_inode(inode, wait)) { | |
142 | jfs_err("jfs_write_inode: jfs_commit_inode failed!"); | |
143 | return -EIO; | |
144 | } else | |
145 | return 0; | |
146 | } | |
147 | ||
148 | void jfs_delete_inode(struct inode *inode) | |
149 | { | |
150 | jfs_info("In jfs_delete_inode, inode = 0x%p", inode); | |
151 | ||
907f4554 | 152 | if (!is_bad_inode(inode)) |
871a2931 | 153 | dquot_initialize(inode); |
907f4554 | 154 | |
b1b5d7f9 | 155 | if (!is_bad_inode(inode) && |
6cb1269b | 156 | (JFS_IP(inode)->fileset == FILESYSTEM_I)) { |
32983696 | 157 | truncate_inode_pages(&inode->i_data, 0); |
fef26658 | 158 | |
b1b5d7f9 DK |
159 | if (test_cflag(COMMIT_Freewmap, inode)) |
160 | jfs_free_zero_link(inode); | |
1da177e4 | 161 | |
b1b5d7f9 | 162 | diFree(inode); |
1da177e4 | 163 | |
b1b5d7f9 DK |
164 | /* |
165 | * Free the inode from the quota allocation. | |
166 | */ | |
871a2931 | 167 | dquot_initialize(inode); |
63936dda | 168 | dquot_free_inode(inode); |
9f754758 | 169 | dquot_drop(inode); |
b1b5d7f9 | 170 | } |
1da177e4 LT |
171 | |
172 | clear_inode(inode); | |
173 | } | |
174 | ||
175 | void jfs_dirty_inode(struct inode *inode) | |
176 | { | |
177 | static int noisy = 5; | |
178 | ||
179 | if (isReadOnly(inode)) { | |
180 | if (!special_file(inode->i_mode) && noisy) { | |
181 | /* kernel allows writes to devices on read-only | |
182 | * partitions and may try to mark inode dirty | |
183 | */ | |
184 | jfs_err("jfs_dirty_inode called on read-only volume"); | |
185 | jfs_err("Is remount racy?"); | |
186 | noisy--; | |
187 | } | |
188 | return; | |
189 | } | |
190 | ||
191 | set_cflag(COMMIT_Dirty, inode); | |
192 | } | |
193 | ||
115ff50b DK |
194 | int jfs_get_block(struct inode *ip, sector_t lblock, |
195 | struct buffer_head *bh_result, int create) | |
1da177e4 LT |
196 | { |
197 | s64 lblock64 = lblock; | |
198 | int rc = 0; | |
1da177e4 LT |
199 | xad_t xad; |
200 | s64 xaddr; | |
201 | int xflag; | |
115ff50b | 202 | s32 xlen = bh_result->b_size >> ip->i_blkbits; |
1da177e4 | 203 | |
1da177e4 LT |
204 | /* |
205 | * Take appropriate lock on inode | |
206 | */ | |
7fab479b | 207 | if (create) |
82d5b9a7 | 208 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
7fab479b | 209 | else |
82d5b9a7 | 210 | IREAD_LOCK(ip, RDWRLOCK_NORMAL); |
1da177e4 LT |
211 | |
212 | if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) && | |
115ff50b | 213 | (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) && |
6628465e | 214 | xaddr) { |
1da177e4 LT |
215 | if (xflag & XAD_NOTRECORDED) { |
216 | if (!create) | |
217 | /* | |
218 | * Allocated but not recorded, read treats | |
219 | * this as a hole | |
220 | */ | |
221 | goto unlock; | |
222 | #ifdef _JFS_4K | |
223 | XADoffset(&xad, lblock64); | |
224 | XADlength(&xad, xlen); | |
225 | XADaddress(&xad, xaddr); | |
226 | #else /* _JFS_4K */ | |
227 | /* | |
228 | * As long as block size = 4K, this isn't a problem. | |
229 | * We should mark the whole page not ABNR, but how | |
230 | * will we know to mark the other blocks BH_New? | |
231 | */ | |
232 | BUG(); | |
233 | #endif /* _JFS_4K */ | |
234 | rc = extRecord(ip, &xad); | |
235 | if (rc) | |
236 | goto unlock; | |
237 | set_buffer_new(bh_result); | |
238 | } | |
239 | ||
240 | map_bh(bh_result, ip->i_sb, xaddr); | |
241 | bh_result->b_size = xlen << ip->i_blkbits; | |
242 | goto unlock; | |
243 | } | |
244 | if (!create) | |
245 | goto unlock; | |
246 | ||
247 | /* | |
248 | * Allocate a new block | |
249 | */ | |
250 | #ifdef _JFS_4K | |
251 | if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad))) | |
252 | goto unlock; | |
4d81715f | 253 | rc = extAlloc(ip, xlen, lblock64, &xad, false); |
1da177e4 LT |
254 | if (rc) |
255 | goto unlock; | |
256 | ||
257 | set_buffer_new(bh_result); | |
258 | map_bh(bh_result, ip->i_sb, addressXAD(&xad)); | |
259 | bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits; | |
260 | ||
261 | #else /* _JFS_4K */ | |
262 | /* | |
263 | * We need to do whatever it takes to keep all but the last buffers | |
264 | * in 4K pages - see jfs_write.c | |
265 | */ | |
266 | BUG(); | |
267 | #endif /* _JFS_4K */ | |
268 | ||
269 | unlock: | |
270 | /* | |
271 | * Release lock on inode | |
272 | */ | |
7fab479b DK |
273 | if (create) |
274 | IWRITE_UNLOCK(ip); | |
275 | else | |
276 | IREAD_UNLOCK(ip); | |
1da177e4 LT |
277 | return rc; |
278 | } | |
279 | ||
1da177e4 LT |
280 | static int jfs_writepage(struct page *page, struct writeback_control *wbc) |
281 | { | |
d5c5f84b | 282 | return block_write_full_page(page, jfs_get_block, wbc); |
1da177e4 LT |
283 | } |
284 | ||
285 | static int jfs_writepages(struct address_space *mapping, | |
286 | struct writeback_control *wbc) | |
287 | { | |
288 | return mpage_writepages(mapping, wbc, jfs_get_block); | |
289 | } | |
290 | ||
291 | static int jfs_readpage(struct file *file, struct page *page) | |
292 | { | |
293 | return mpage_readpage(page, jfs_get_block); | |
294 | } | |
295 | ||
296 | static int jfs_readpages(struct file *file, struct address_space *mapping, | |
297 | struct list_head *pages, unsigned nr_pages) | |
298 | { | |
299 | return mpage_readpages(mapping, pages, nr_pages, jfs_get_block); | |
300 | } | |
301 | ||
d5c5f84b NP |
302 | static int jfs_write_begin(struct file *file, struct address_space *mapping, |
303 | loff_t pos, unsigned len, unsigned flags, | |
304 | struct page **pagep, void **fsdata) | |
1da177e4 | 305 | { |
03158cd7 | 306 | return nobh_write_begin(file, mapping, pos, len, flags, pagep, fsdata, |
d5c5f84b | 307 | jfs_get_block); |
1da177e4 LT |
308 | } |
309 | ||
310 | static sector_t jfs_bmap(struct address_space *mapping, sector_t block) | |
311 | { | |
312 | return generic_block_bmap(mapping, block, jfs_get_block); | |
313 | } | |
314 | ||
315 | static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb, | |
316 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
317 | { | |
318 | struct file *file = iocb->ki_filp; | |
319 | struct inode *inode = file->f_mapping->host; | |
eafdc7d1 | 320 | ssize_t ret; |
1da177e4 | 321 | |
eafdc7d1 | 322 | ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, |
1d8fa7a2 | 323 | offset, nr_segs, jfs_get_block, NULL); |
eafdc7d1 CH |
324 | |
325 | /* | |
326 | * In case of error extending write may have instantiated a few | |
327 | * blocks outside i_size. Trim these off again. | |
328 | */ | |
329 | if (unlikely((rw & WRITE) && ret < 0)) { | |
330 | loff_t isize = i_size_read(inode); | |
331 | loff_t end = offset + iov_length(iov, nr_segs); | |
332 | ||
333 | if (end > isize) | |
334 | vmtruncate(inode, isize); | |
335 | } | |
336 | ||
337 | return ret; | |
1da177e4 LT |
338 | } |
339 | ||
f5e54d6e | 340 | const struct address_space_operations jfs_aops = { |
1da177e4 LT |
341 | .readpage = jfs_readpage, |
342 | .readpages = jfs_readpages, | |
343 | .writepage = jfs_writepage, | |
344 | .writepages = jfs_writepages, | |
345 | .sync_page = block_sync_page, | |
d5c5f84b | 346 | .write_begin = jfs_write_begin, |
03158cd7 | 347 | .write_end = nobh_write_end, |
1da177e4 LT |
348 | .bmap = jfs_bmap, |
349 | .direct_IO = jfs_direct_IO, | |
350 | }; | |
351 | ||
352 | /* | |
353 | * Guts of jfs_truncate. Called with locks already held. Can be called | |
354 | * with directory for truncating directory index table. | |
355 | */ | |
356 | void jfs_truncate_nolock(struct inode *ip, loff_t length) | |
357 | { | |
358 | loff_t newsize; | |
359 | tid_t tid; | |
360 | ||
361 | ASSERT(length >= 0); | |
362 | ||
363 | if (test_cflag(COMMIT_Nolink, ip)) { | |
364 | xtTruncate(0, ip, length, COMMIT_WMAP); | |
365 | return; | |
366 | } | |
367 | ||
368 | do { | |
369 | tid = txBegin(ip->i_sb, 0); | |
370 | ||
371 | /* | |
1de87444 | 372 | * The commit_mutex cannot be taken before txBegin. |
1da177e4 LT |
373 | * txBegin may block and there is a chance the inode |
374 | * could be marked dirty and need to be committed | |
375 | * before txBegin unblocks | |
376 | */ | |
1de87444 | 377 | mutex_lock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
378 | |
379 | newsize = xtTruncate(tid, ip, length, | |
380 | COMMIT_TRUNCATE | COMMIT_PWMAP); | |
381 | if (newsize < 0) { | |
382 | txEnd(tid); | |
1de87444 | 383 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
384 | break; |
385 | } | |
386 | ||
387 | ip->i_mtime = ip->i_ctime = CURRENT_TIME; | |
388 | mark_inode_dirty(ip); | |
389 | ||
390 | txCommit(tid, 1, &ip, 0); | |
391 | txEnd(tid); | |
1de87444 | 392 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
393 | } while (newsize > length); /* Truncate isn't always atomic */ |
394 | } | |
395 | ||
396 | void jfs_truncate(struct inode *ip) | |
397 | { | |
398 | jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size); | |
399 | ||
03158cd7 | 400 | nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block); |
1da177e4 | 401 | |
82d5b9a7 | 402 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
1da177e4 LT |
403 | jfs_truncate_nolock(ip, ip->i_size); |
404 | IWRITE_UNLOCK(ip); | |
405 | } |