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> | |
25 | #include "jfs_incore.h" | |
1868f4aa | 26 | #include "jfs_inode.h" |
1da177e4 LT |
27 | #include "jfs_filsys.h" |
28 | #include "jfs_imap.h" | |
29 | #include "jfs_extent.h" | |
30 | #include "jfs_unicode.h" | |
31 | #include "jfs_debug.h" | |
32 | ||
33 | ||
eab1df71 | 34 | struct inode *jfs_iget(struct super_block *sb, unsigned long ino) |
1da177e4 | 35 | { |
eab1df71 DH |
36 | struct inode *inode; |
37 | int ret; | |
38 | ||
39 | inode = iget_locked(sb, ino); | |
40 | if (!inode) | |
41 | return ERR_PTR(-ENOMEM); | |
42 | if (!(inode->i_state & I_NEW)) | |
43 | return inode; | |
44 | ||
45 | ret = diRead(inode); | |
46 | if (ret < 0) { | |
47 | iget_failed(inode); | |
48 | return ERR_PTR(ret); | |
1da177e4 LT |
49 | } |
50 | ||
51 | if (S_ISREG(inode->i_mode)) { | |
52 | inode->i_op = &jfs_file_inode_operations; | |
53 | inode->i_fop = &jfs_file_operations; | |
54 | inode->i_mapping->a_ops = &jfs_aops; | |
55 | } else if (S_ISDIR(inode->i_mode)) { | |
56 | inode->i_op = &jfs_dir_inode_operations; | |
57 | inode->i_fop = &jfs_dir_operations; | |
58 | } else if (S_ISLNK(inode->i_mode)) { | |
59 | if (inode->i_size >= IDATASIZE) { | |
60 | inode->i_op = &page_symlink_inode_operations; | |
61 | inode->i_mapping->a_ops = &jfs_aops; | |
d69e83d9 | 62 | } else { |
1da177e4 | 63 | inode->i_op = &jfs_symlink_inode_operations; |
d69e83d9 DK |
64 | /* |
65 | * The inline data should be null-terminated, but | |
66 | * don't let on-disk corruption crash the kernel | |
67 | */ | |
68 | JFS_IP(inode)->i_inline[inode->i_size] = '\0'; | |
69 | } | |
1da177e4 LT |
70 | } else { |
71 | inode->i_op = &jfs_file_inode_operations; | |
72 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
73 | } | |
eab1df71 DH |
74 | unlock_new_inode(inode); |
75 | return inode; | |
1da177e4 LT |
76 | } |
77 | ||
78 | /* | |
79 | * Workhorse of both fsync & write_inode | |
80 | */ | |
81 | int jfs_commit_inode(struct inode *inode, int wait) | |
82 | { | |
83 | int rc = 0; | |
84 | tid_t tid; | |
85 | static int noisy = 5; | |
86 | ||
87 | jfs_info("In jfs_commit_inode, inode = 0x%p", inode); | |
88 | ||
89 | /* | |
90 | * Don't commit if inode has been committed since last being | |
91 | * marked dirty, or if it has been deleted. | |
92 | */ | |
93 | if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode)) | |
94 | return 0; | |
95 | ||
96 | if (isReadOnly(inode)) { | |
97 | /* kernel allows writes to devices on read-only | |
98 | * partitions and may think inode is dirty | |
99 | */ | |
100 | if (!special_file(inode->i_mode) && noisy) { | |
101 | jfs_err("jfs_commit_inode(0x%p) called on " | |
102 | "read-only volume", inode); | |
103 | jfs_err("Is remount racy?"); | |
104 | noisy--; | |
105 | } | |
106 | return 0; | |
107 | } | |
108 | ||
109 | tid = txBegin(inode->i_sb, COMMIT_INODE); | |
1de87444 | 110 | mutex_lock(&JFS_IP(inode)->commit_mutex); |
1da177e4 LT |
111 | |
112 | /* | |
1de87444 | 113 | * Retest inode state after taking commit_mutex |
1da177e4 LT |
114 | */ |
115 | if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode)) | |
116 | rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0); | |
117 | ||
118 | txEnd(tid); | |
1de87444 | 119 | mutex_unlock(&JFS_IP(inode)->commit_mutex); |
1da177e4 LT |
120 | return rc; |
121 | } | |
122 | ||
123 | int jfs_write_inode(struct inode *inode, int wait) | |
124 | { | |
125 | if (test_cflag(COMMIT_Nolink, inode)) | |
126 | return 0; | |
127 | /* | |
128 | * If COMMIT_DIRTY is not set, the inode isn't really dirty. | |
129 | * It has been committed since the last change, but was still | |
130 | * on the dirty inode list. | |
131 | */ | |
132 | if (!test_cflag(COMMIT_Dirty, inode)) { | |
133 | /* Make sure committed changes hit the disk */ | |
134 | jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait); | |
135 | return 0; | |
136 | } | |
137 | ||
138 | if (jfs_commit_inode(inode, wait)) { | |
139 | jfs_err("jfs_write_inode: jfs_commit_inode failed!"); | |
140 | return -EIO; | |
141 | } else | |
142 | return 0; | |
143 | } | |
144 | ||
145 | void jfs_delete_inode(struct inode *inode) | |
146 | { | |
147 | jfs_info("In jfs_delete_inode, inode = 0x%p", inode); | |
148 | ||
b1b5d7f9 | 149 | if (!is_bad_inode(inode) && |
6cb1269b | 150 | (JFS_IP(inode)->fileset == FILESYSTEM_I)) { |
32983696 | 151 | truncate_inode_pages(&inode->i_data, 0); |
fef26658 | 152 | |
b1b5d7f9 DK |
153 | if (test_cflag(COMMIT_Freewmap, inode)) |
154 | jfs_free_zero_link(inode); | |
1da177e4 | 155 | |
b1b5d7f9 | 156 | diFree(inode); |
1da177e4 | 157 | |
b1b5d7f9 DK |
158 | /* |
159 | * Free the inode from the quota allocation. | |
160 | */ | |
c94d2a22 JK |
161 | vfs_dq_init(inode); |
162 | vfs_dq_free_inode(inode); | |
163 | vfs_dq_drop(inode); | |
b1b5d7f9 | 164 | } |
1da177e4 LT |
165 | |
166 | clear_inode(inode); | |
167 | } | |
168 | ||
169 | void jfs_dirty_inode(struct inode *inode) | |
170 | { | |
171 | static int noisy = 5; | |
172 | ||
173 | if (isReadOnly(inode)) { | |
174 | if (!special_file(inode->i_mode) && noisy) { | |
175 | /* kernel allows writes to devices on read-only | |
176 | * partitions and may try to mark inode dirty | |
177 | */ | |
178 | jfs_err("jfs_dirty_inode called on read-only volume"); | |
179 | jfs_err("Is remount racy?"); | |
180 | noisy--; | |
181 | } | |
182 | return; | |
183 | } | |
184 | ||
185 | set_cflag(COMMIT_Dirty, inode); | |
186 | } | |
187 | ||
115ff50b DK |
188 | int jfs_get_block(struct inode *ip, sector_t lblock, |
189 | struct buffer_head *bh_result, int create) | |
1da177e4 LT |
190 | { |
191 | s64 lblock64 = lblock; | |
192 | int rc = 0; | |
1da177e4 LT |
193 | xad_t xad; |
194 | s64 xaddr; | |
195 | int xflag; | |
115ff50b | 196 | s32 xlen = bh_result->b_size >> ip->i_blkbits; |
1da177e4 | 197 | |
1da177e4 LT |
198 | /* |
199 | * Take appropriate lock on inode | |
200 | */ | |
7fab479b | 201 | if (create) |
82d5b9a7 | 202 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
7fab479b | 203 | else |
82d5b9a7 | 204 | IREAD_LOCK(ip, RDWRLOCK_NORMAL); |
1da177e4 LT |
205 | |
206 | if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) && | |
115ff50b | 207 | (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) && |
6628465e | 208 | xaddr) { |
1da177e4 LT |
209 | if (xflag & XAD_NOTRECORDED) { |
210 | if (!create) | |
211 | /* | |
212 | * Allocated but not recorded, read treats | |
213 | * this as a hole | |
214 | */ | |
215 | goto unlock; | |
216 | #ifdef _JFS_4K | |
217 | XADoffset(&xad, lblock64); | |
218 | XADlength(&xad, xlen); | |
219 | XADaddress(&xad, xaddr); | |
220 | #else /* _JFS_4K */ | |
221 | /* | |
222 | * As long as block size = 4K, this isn't a problem. | |
223 | * We should mark the whole page not ABNR, but how | |
224 | * will we know to mark the other blocks BH_New? | |
225 | */ | |
226 | BUG(); | |
227 | #endif /* _JFS_4K */ | |
228 | rc = extRecord(ip, &xad); | |
229 | if (rc) | |
230 | goto unlock; | |
231 | set_buffer_new(bh_result); | |
232 | } | |
233 | ||
234 | map_bh(bh_result, ip->i_sb, xaddr); | |
235 | bh_result->b_size = xlen << ip->i_blkbits; | |
236 | goto unlock; | |
237 | } | |
238 | if (!create) | |
239 | goto unlock; | |
240 | ||
241 | /* | |
242 | * Allocate a new block | |
243 | */ | |
244 | #ifdef _JFS_4K | |
245 | if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad))) | |
246 | goto unlock; | |
4d81715f | 247 | rc = extAlloc(ip, xlen, lblock64, &xad, false); |
1da177e4 LT |
248 | if (rc) |
249 | goto unlock; | |
250 | ||
251 | set_buffer_new(bh_result); | |
252 | map_bh(bh_result, ip->i_sb, addressXAD(&xad)); | |
253 | bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits; | |
254 | ||
255 | #else /* _JFS_4K */ | |
256 | /* | |
257 | * We need to do whatever it takes to keep all but the last buffers | |
258 | * in 4K pages - see jfs_write.c | |
259 | */ | |
260 | BUG(); | |
261 | #endif /* _JFS_4K */ | |
262 | ||
263 | unlock: | |
264 | /* | |
265 | * Release lock on inode | |
266 | */ | |
7fab479b DK |
267 | if (create) |
268 | IWRITE_UNLOCK(ip); | |
269 | else | |
270 | IREAD_UNLOCK(ip); | |
1da177e4 LT |
271 | return rc; |
272 | } | |
273 | ||
1da177e4 LT |
274 | static int jfs_writepage(struct page *page, struct writeback_control *wbc) |
275 | { | |
d5c5f84b | 276 | return block_write_full_page(page, jfs_get_block, wbc); |
1da177e4 LT |
277 | } |
278 | ||
279 | static int jfs_writepages(struct address_space *mapping, | |
280 | struct writeback_control *wbc) | |
281 | { | |
282 | return mpage_writepages(mapping, wbc, jfs_get_block); | |
283 | } | |
284 | ||
285 | static int jfs_readpage(struct file *file, struct page *page) | |
286 | { | |
287 | return mpage_readpage(page, jfs_get_block); | |
288 | } | |
289 | ||
290 | static int jfs_readpages(struct file *file, struct address_space *mapping, | |
291 | struct list_head *pages, unsigned nr_pages) | |
292 | { | |
293 | return mpage_readpages(mapping, pages, nr_pages, jfs_get_block); | |
294 | } | |
295 | ||
d5c5f84b NP |
296 | static int jfs_write_begin(struct file *file, struct address_space *mapping, |
297 | loff_t pos, unsigned len, unsigned flags, | |
298 | struct page **pagep, void **fsdata) | |
1da177e4 | 299 | { |
03158cd7 | 300 | return nobh_write_begin(file, mapping, pos, len, flags, pagep, fsdata, |
d5c5f84b | 301 | jfs_get_block); |
1da177e4 LT |
302 | } |
303 | ||
304 | static sector_t jfs_bmap(struct address_space *mapping, sector_t block) | |
305 | { | |
306 | return generic_block_bmap(mapping, block, jfs_get_block); | |
307 | } | |
308 | ||
309 | static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb, | |
310 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
311 | { | |
312 | struct file *file = iocb->ki_filp; | |
313 | struct inode *inode = file->f_mapping->host; | |
314 | ||
315 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
1d8fa7a2 | 316 | offset, nr_segs, jfs_get_block, NULL); |
1da177e4 LT |
317 | } |
318 | ||
f5e54d6e | 319 | const struct address_space_operations jfs_aops = { |
1da177e4 LT |
320 | .readpage = jfs_readpage, |
321 | .readpages = jfs_readpages, | |
322 | .writepage = jfs_writepage, | |
323 | .writepages = jfs_writepages, | |
324 | .sync_page = block_sync_page, | |
d5c5f84b | 325 | .write_begin = jfs_write_begin, |
03158cd7 | 326 | .write_end = nobh_write_end, |
1da177e4 LT |
327 | .bmap = jfs_bmap, |
328 | .direct_IO = jfs_direct_IO, | |
329 | }; | |
330 | ||
331 | /* | |
332 | * Guts of jfs_truncate. Called with locks already held. Can be called | |
333 | * with directory for truncating directory index table. | |
334 | */ | |
335 | void jfs_truncate_nolock(struct inode *ip, loff_t length) | |
336 | { | |
337 | loff_t newsize; | |
338 | tid_t tid; | |
339 | ||
340 | ASSERT(length >= 0); | |
341 | ||
342 | if (test_cflag(COMMIT_Nolink, ip)) { | |
343 | xtTruncate(0, ip, length, COMMIT_WMAP); | |
344 | return; | |
345 | } | |
346 | ||
347 | do { | |
348 | tid = txBegin(ip->i_sb, 0); | |
349 | ||
350 | /* | |
1de87444 | 351 | * The commit_mutex cannot be taken before txBegin. |
1da177e4 LT |
352 | * txBegin may block and there is a chance the inode |
353 | * could be marked dirty and need to be committed | |
354 | * before txBegin unblocks | |
355 | */ | |
1de87444 | 356 | mutex_lock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
357 | |
358 | newsize = xtTruncate(tid, ip, length, | |
359 | COMMIT_TRUNCATE | COMMIT_PWMAP); | |
360 | if (newsize < 0) { | |
361 | txEnd(tid); | |
1de87444 | 362 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
363 | break; |
364 | } | |
365 | ||
366 | ip->i_mtime = ip->i_ctime = CURRENT_TIME; | |
367 | mark_inode_dirty(ip); | |
368 | ||
369 | txCommit(tid, 1, &ip, 0); | |
370 | txEnd(tid); | |
1de87444 | 371 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
372 | } while (newsize > length); /* Truncate isn't always atomic */ |
373 | } | |
374 | ||
375 | void jfs_truncate(struct inode *ip) | |
376 | { | |
377 | jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size); | |
378 | ||
03158cd7 | 379 | nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block); |
1da177e4 | 380 | |
82d5b9a7 | 381 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
1da177e4 LT |
382 | jfs_truncate_nolock(ip, ip->i_size); |
383 | IWRITE_UNLOCK(ip); | |
384 | } |