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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 | ||
907f4554 | 149 | if (!is_bad_inode(inode)) |
871a2931 | 150 | dquot_initialize(inode); |
907f4554 | 151 | |
b1b5d7f9 | 152 | if (!is_bad_inode(inode) && |
6cb1269b | 153 | (JFS_IP(inode)->fileset == FILESYSTEM_I)) { |
32983696 | 154 | truncate_inode_pages(&inode->i_data, 0); |
fef26658 | 155 | |
b1b5d7f9 DK |
156 | if (test_cflag(COMMIT_Freewmap, inode)) |
157 | jfs_free_zero_link(inode); | |
1da177e4 | 158 | |
b1b5d7f9 | 159 | diFree(inode); |
1da177e4 | 160 | |
b1b5d7f9 DK |
161 | /* |
162 | * Free the inode from the quota allocation. | |
163 | */ | |
871a2931 | 164 | dquot_initialize(inode); |
63936dda | 165 | dquot_free_inode(inode); |
9f754758 | 166 | dquot_drop(inode); |
b1b5d7f9 | 167 | } |
1da177e4 LT |
168 | |
169 | clear_inode(inode); | |
170 | } | |
171 | ||
172 | void jfs_dirty_inode(struct inode *inode) | |
173 | { | |
174 | static int noisy = 5; | |
175 | ||
176 | if (isReadOnly(inode)) { | |
177 | if (!special_file(inode->i_mode) && noisy) { | |
178 | /* kernel allows writes to devices on read-only | |
179 | * partitions and may try to mark inode dirty | |
180 | */ | |
181 | jfs_err("jfs_dirty_inode called on read-only volume"); | |
182 | jfs_err("Is remount racy?"); | |
183 | noisy--; | |
184 | } | |
185 | return; | |
186 | } | |
187 | ||
188 | set_cflag(COMMIT_Dirty, inode); | |
189 | } | |
190 | ||
115ff50b DK |
191 | int jfs_get_block(struct inode *ip, sector_t lblock, |
192 | struct buffer_head *bh_result, int create) | |
1da177e4 LT |
193 | { |
194 | s64 lblock64 = lblock; | |
195 | int rc = 0; | |
1da177e4 LT |
196 | xad_t xad; |
197 | s64 xaddr; | |
198 | int xflag; | |
115ff50b | 199 | s32 xlen = bh_result->b_size >> ip->i_blkbits; |
1da177e4 | 200 | |
1da177e4 LT |
201 | /* |
202 | * Take appropriate lock on inode | |
203 | */ | |
7fab479b | 204 | if (create) |
82d5b9a7 | 205 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
7fab479b | 206 | else |
82d5b9a7 | 207 | IREAD_LOCK(ip, RDWRLOCK_NORMAL); |
1da177e4 LT |
208 | |
209 | if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) && | |
115ff50b | 210 | (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) && |
6628465e | 211 | xaddr) { |
1da177e4 LT |
212 | if (xflag & XAD_NOTRECORDED) { |
213 | if (!create) | |
214 | /* | |
215 | * Allocated but not recorded, read treats | |
216 | * this as a hole | |
217 | */ | |
218 | goto unlock; | |
219 | #ifdef _JFS_4K | |
220 | XADoffset(&xad, lblock64); | |
221 | XADlength(&xad, xlen); | |
222 | XADaddress(&xad, xaddr); | |
223 | #else /* _JFS_4K */ | |
224 | /* | |
225 | * As long as block size = 4K, this isn't a problem. | |
226 | * We should mark the whole page not ABNR, but how | |
227 | * will we know to mark the other blocks BH_New? | |
228 | */ | |
229 | BUG(); | |
230 | #endif /* _JFS_4K */ | |
231 | rc = extRecord(ip, &xad); | |
232 | if (rc) | |
233 | goto unlock; | |
234 | set_buffer_new(bh_result); | |
235 | } | |
236 | ||
237 | map_bh(bh_result, ip->i_sb, xaddr); | |
238 | bh_result->b_size = xlen << ip->i_blkbits; | |
239 | goto unlock; | |
240 | } | |
241 | if (!create) | |
242 | goto unlock; | |
243 | ||
244 | /* | |
245 | * Allocate a new block | |
246 | */ | |
247 | #ifdef _JFS_4K | |
248 | if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad))) | |
249 | goto unlock; | |
4d81715f | 250 | rc = extAlloc(ip, xlen, lblock64, &xad, false); |
1da177e4 LT |
251 | if (rc) |
252 | goto unlock; | |
253 | ||
254 | set_buffer_new(bh_result); | |
255 | map_bh(bh_result, ip->i_sb, addressXAD(&xad)); | |
256 | bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits; | |
257 | ||
258 | #else /* _JFS_4K */ | |
259 | /* | |
260 | * We need to do whatever it takes to keep all but the last buffers | |
261 | * in 4K pages - see jfs_write.c | |
262 | */ | |
263 | BUG(); | |
264 | #endif /* _JFS_4K */ | |
265 | ||
266 | unlock: | |
267 | /* | |
268 | * Release lock on inode | |
269 | */ | |
7fab479b DK |
270 | if (create) |
271 | IWRITE_UNLOCK(ip); | |
272 | else | |
273 | IREAD_UNLOCK(ip); | |
1da177e4 LT |
274 | return rc; |
275 | } | |
276 | ||
1da177e4 LT |
277 | static int jfs_writepage(struct page *page, struct writeback_control *wbc) |
278 | { | |
d5c5f84b | 279 | return block_write_full_page(page, jfs_get_block, wbc); |
1da177e4 LT |
280 | } |
281 | ||
282 | static int jfs_writepages(struct address_space *mapping, | |
283 | struct writeback_control *wbc) | |
284 | { | |
285 | return mpage_writepages(mapping, wbc, jfs_get_block); | |
286 | } | |
287 | ||
288 | static int jfs_readpage(struct file *file, struct page *page) | |
289 | { | |
290 | return mpage_readpage(page, jfs_get_block); | |
291 | } | |
292 | ||
293 | static int jfs_readpages(struct file *file, struct address_space *mapping, | |
294 | struct list_head *pages, unsigned nr_pages) | |
295 | { | |
296 | return mpage_readpages(mapping, pages, nr_pages, jfs_get_block); | |
297 | } | |
298 | ||
d5c5f84b NP |
299 | static int jfs_write_begin(struct file *file, struct address_space *mapping, |
300 | loff_t pos, unsigned len, unsigned flags, | |
301 | struct page **pagep, void **fsdata) | |
1da177e4 | 302 | { |
03158cd7 | 303 | return nobh_write_begin(file, mapping, pos, len, flags, pagep, fsdata, |
d5c5f84b | 304 | jfs_get_block); |
1da177e4 LT |
305 | } |
306 | ||
307 | static sector_t jfs_bmap(struct address_space *mapping, sector_t block) | |
308 | { | |
309 | return generic_block_bmap(mapping, block, jfs_get_block); | |
310 | } | |
311 | ||
312 | static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb, | |
313 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
314 | { | |
315 | struct file *file = iocb->ki_filp; | |
316 | struct inode *inode = file->f_mapping->host; | |
317 | ||
318 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
1d8fa7a2 | 319 | offset, nr_segs, jfs_get_block, NULL); |
1da177e4 LT |
320 | } |
321 | ||
f5e54d6e | 322 | const struct address_space_operations jfs_aops = { |
1da177e4 LT |
323 | .readpage = jfs_readpage, |
324 | .readpages = jfs_readpages, | |
325 | .writepage = jfs_writepage, | |
326 | .writepages = jfs_writepages, | |
327 | .sync_page = block_sync_page, | |
d5c5f84b | 328 | .write_begin = jfs_write_begin, |
03158cd7 | 329 | .write_end = nobh_write_end, |
1da177e4 LT |
330 | .bmap = jfs_bmap, |
331 | .direct_IO = jfs_direct_IO, | |
332 | }; | |
333 | ||
334 | /* | |
335 | * Guts of jfs_truncate. Called with locks already held. Can be called | |
336 | * with directory for truncating directory index table. | |
337 | */ | |
338 | void jfs_truncate_nolock(struct inode *ip, loff_t length) | |
339 | { | |
340 | loff_t newsize; | |
341 | tid_t tid; | |
342 | ||
343 | ASSERT(length >= 0); | |
344 | ||
345 | if (test_cflag(COMMIT_Nolink, ip)) { | |
346 | xtTruncate(0, ip, length, COMMIT_WMAP); | |
347 | return; | |
348 | } | |
349 | ||
350 | do { | |
351 | tid = txBegin(ip->i_sb, 0); | |
352 | ||
353 | /* | |
1de87444 | 354 | * The commit_mutex cannot be taken before txBegin. |
1da177e4 LT |
355 | * txBegin may block and there is a chance the inode |
356 | * could be marked dirty and need to be committed | |
357 | * before txBegin unblocks | |
358 | */ | |
1de87444 | 359 | mutex_lock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
360 | |
361 | newsize = xtTruncate(tid, ip, length, | |
362 | COMMIT_TRUNCATE | COMMIT_PWMAP); | |
363 | if (newsize < 0) { | |
364 | txEnd(tid); | |
1de87444 | 365 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
366 | break; |
367 | } | |
368 | ||
369 | ip->i_mtime = ip->i_ctime = CURRENT_TIME; | |
370 | mark_inode_dirty(ip); | |
371 | ||
372 | txCommit(tid, 1, &ip, 0); | |
373 | txEnd(tid); | |
1de87444 | 374 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
375 | } while (newsize > length); /* Truncate isn't always atomic */ |
376 | } | |
377 | ||
378 | void jfs_truncate(struct inode *ip) | |
379 | { | |
380 | jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size); | |
381 | ||
03158cd7 | 382 | nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block); |
1da177e4 | 383 | |
82d5b9a7 | 384 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
1da177e4 LT |
385 | jfs_truncate_nolock(ip, ip->i_size); |
386 | IWRITE_UNLOCK(ip); | |
387 | } |