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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 | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
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 | |
16 | * along with this program; if not, write to the Free Software | |
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 | ||
1da177e4 LT |
34 | void jfs_read_inode(struct inode *inode) |
35 | { | |
36 | if (diRead(inode)) { | |
37 | make_bad_inode(inode); | |
38 | return; | |
39 | } | |
40 | ||
41 | if (S_ISREG(inode->i_mode)) { | |
42 | inode->i_op = &jfs_file_inode_operations; | |
43 | inode->i_fop = &jfs_file_operations; | |
44 | inode->i_mapping->a_ops = &jfs_aops; | |
45 | } else if (S_ISDIR(inode->i_mode)) { | |
46 | inode->i_op = &jfs_dir_inode_operations; | |
47 | inode->i_fop = &jfs_dir_operations; | |
48 | } else if (S_ISLNK(inode->i_mode)) { | |
49 | if (inode->i_size >= IDATASIZE) { | |
50 | inode->i_op = &page_symlink_inode_operations; | |
51 | inode->i_mapping->a_ops = &jfs_aops; | |
52 | } else | |
53 | inode->i_op = &jfs_symlink_inode_operations; | |
54 | } else { | |
55 | inode->i_op = &jfs_file_inode_operations; | |
56 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
57 | } | |
58 | } | |
59 | ||
60 | /* | |
61 | * Workhorse of both fsync & write_inode | |
62 | */ | |
63 | int jfs_commit_inode(struct inode *inode, int wait) | |
64 | { | |
65 | int rc = 0; | |
66 | tid_t tid; | |
67 | static int noisy = 5; | |
68 | ||
69 | jfs_info("In jfs_commit_inode, inode = 0x%p", inode); | |
70 | ||
71 | /* | |
72 | * Don't commit if inode has been committed since last being | |
73 | * marked dirty, or if it has been deleted. | |
74 | */ | |
75 | if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode)) | |
76 | return 0; | |
77 | ||
78 | if (isReadOnly(inode)) { | |
79 | /* kernel allows writes to devices on read-only | |
80 | * partitions and may think inode is dirty | |
81 | */ | |
82 | if (!special_file(inode->i_mode) && noisy) { | |
83 | jfs_err("jfs_commit_inode(0x%p) called on " | |
84 | "read-only volume", inode); | |
85 | jfs_err("Is remount racy?"); | |
86 | noisy--; | |
87 | } | |
88 | return 0; | |
89 | } | |
90 | ||
91 | tid = txBegin(inode->i_sb, COMMIT_INODE); | |
92 | down(&JFS_IP(inode)->commit_sem); | |
93 | ||
94 | /* | |
95 | * Retest inode state after taking commit_sem | |
96 | */ | |
97 | if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode)) | |
98 | rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0); | |
99 | ||
100 | txEnd(tid); | |
101 | up(&JFS_IP(inode)->commit_sem); | |
102 | return rc; | |
103 | } | |
104 | ||
105 | int jfs_write_inode(struct inode *inode, int wait) | |
106 | { | |
107 | if (test_cflag(COMMIT_Nolink, inode)) | |
108 | return 0; | |
109 | /* | |
110 | * If COMMIT_DIRTY is not set, the inode isn't really dirty. | |
111 | * It has been committed since the last change, but was still | |
112 | * on the dirty inode list. | |
113 | */ | |
114 | if (!test_cflag(COMMIT_Dirty, inode)) { | |
115 | /* Make sure committed changes hit the disk */ | |
116 | jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait); | |
117 | return 0; | |
118 | } | |
119 | ||
120 | if (jfs_commit_inode(inode, wait)) { | |
121 | jfs_err("jfs_write_inode: jfs_commit_inode failed!"); | |
122 | return -EIO; | |
123 | } else | |
124 | return 0; | |
125 | } | |
126 | ||
127 | void jfs_delete_inode(struct inode *inode) | |
128 | { | |
129 | jfs_info("In jfs_delete_inode, inode = 0x%p", inode); | |
130 | ||
30db1ae8 DK |
131 | if (is_bad_inode(inode) || |
132 | (JFS_IP(inode)->fileset != cpu_to_le32(FILESYSTEM_I))) | |
133 | return; | |
134 | ||
fef26658 MF |
135 | truncate_inode_pages(&inode->i_data, 0); |
136 | ||
1da177e4 | 137 | if (test_cflag(COMMIT_Freewmap, inode)) |
1868f4aa | 138 | jfs_free_zero_link(inode); |
1da177e4 LT |
139 | |
140 | diFree(inode); | |
141 | ||
142 | /* | |
143 | * Free the inode from the quota allocation. | |
144 | */ | |
145 | DQUOT_INIT(inode); | |
146 | DQUOT_FREE_INODE(inode); | |
147 | DQUOT_DROP(inode); | |
148 | ||
149 | clear_inode(inode); | |
150 | } | |
151 | ||
152 | void jfs_dirty_inode(struct inode *inode) | |
153 | { | |
154 | static int noisy = 5; | |
155 | ||
156 | if (isReadOnly(inode)) { | |
157 | if (!special_file(inode->i_mode) && noisy) { | |
158 | /* kernel allows writes to devices on read-only | |
159 | * partitions and may try to mark inode dirty | |
160 | */ | |
161 | jfs_err("jfs_dirty_inode called on read-only volume"); | |
162 | jfs_err("Is remount racy?"); | |
163 | noisy--; | |
164 | } | |
165 | return; | |
166 | } | |
167 | ||
168 | set_cflag(COMMIT_Dirty, inode); | |
169 | } | |
170 | ||
171 | static int | |
172 | jfs_get_blocks(struct inode *ip, sector_t lblock, unsigned long max_blocks, | |
173 | struct buffer_head *bh_result, int create) | |
174 | { | |
175 | s64 lblock64 = lblock; | |
176 | int rc = 0; | |
1da177e4 LT |
177 | xad_t xad; |
178 | s64 xaddr; | |
179 | int xflag; | |
6628465e | 180 | s32 xlen = max_blocks; |
1da177e4 | 181 | |
1da177e4 LT |
182 | /* |
183 | * Take appropriate lock on inode | |
184 | */ | |
7fab479b DK |
185 | if (create) |
186 | IWRITE_LOCK(ip); | |
187 | else | |
188 | IREAD_LOCK(ip); | |
1da177e4 LT |
189 | |
190 | if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) && | |
7fab479b | 191 | (!xtLookup(ip, lblock64, max_blocks, &xflag, &xaddr, &xlen, 0)) && |
6628465e | 192 | xaddr) { |
1da177e4 LT |
193 | if (xflag & XAD_NOTRECORDED) { |
194 | if (!create) | |
195 | /* | |
196 | * Allocated but not recorded, read treats | |
197 | * this as a hole | |
198 | */ | |
199 | goto unlock; | |
200 | #ifdef _JFS_4K | |
201 | XADoffset(&xad, lblock64); | |
202 | XADlength(&xad, xlen); | |
203 | XADaddress(&xad, xaddr); | |
204 | #else /* _JFS_4K */ | |
205 | /* | |
206 | * As long as block size = 4K, this isn't a problem. | |
207 | * We should mark the whole page not ABNR, but how | |
208 | * will we know to mark the other blocks BH_New? | |
209 | */ | |
210 | BUG(); | |
211 | #endif /* _JFS_4K */ | |
212 | rc = extRecord(ip, &xad); | |
213 | if (rc) | |
214 | goto unlock; | |
215 | set_buffer_new(bh_result); | |
216 | } | |
217 | ||
218 | map_bh(bh_result, ip->i_sb, xaddr); | |
219 | bh_result->b_size = xlen << ip->i_blkbits; | |
220 | goto unlock; | |
221 | } | |
222 | if (!create) | |
223 | goto unlock; | |
224 | ||
225 | /* | |
226 | * Allocate a new block | |
227 | */ | |
228 | #ifdef _JFS_4K | |
229 | if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad))) | |
230 | goto unlock; | |
6628465e | 231 | rc = extAlloc(ip, xlen, lblock64, &xad, FALSE); |
1da177e4 LT |
232 | if (rc) |
233 | goto unlock; | |
234 | ||
235 | set_buffer_new(bh_result); | |
236 | map_bh(bh_result, ip->i_sb, addressXAD(&xad)); | |
237 | bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits; | |
238 | ||
239 | #else /* _JFS_4K */ | |
240 | /* | |
241 | * We need to do whatever it takes to keep all but the last buffers | |
242 | * in 4K pages - see jfs_write.c | |
243 | */ | |
244 | BUG(); | |
245 | #endif /* _JFS_4K */ | |
246 | ||
247 | unlock: | |
248 | /* | |
249 | * Release lock on inode | |
250 | */ | |
7fab479b DK |
251 | if (create) |
252 | IWRITE_UNLOCK(ip); | |
253 | else | |
254 | IREAD_UNLOCK(ip); | |
1da177e4 LT |
255 | return rc; |
256 | } | |
257 | ||
258 | static int jfs_get_block(struct inode *ip, sector_t lblock, | |
259 | struct buffer_head *bh_result, int create) | |
260 | { | |
261 | return jfs_get_blocks(ip, lblock, 1, bh_result, create); | |
262 | } | |
263 | ||
264 | static int jfs_writepage(struct page *page, struct writeback_control *wbc) | |
265 | { | |
266 | return nobh_writepage(page, jfs_get_block, wbc); | |
267 | } | |
268 | ||
269 | static int jfs_writepages(struct address_space *mapping, | |
270 | struct writeback_control *wbc) | |
271 | { | |
272 | return mpage_writepages(mapping, wbc, jfs_get_block); | |
273 | } | |
274 | ||
275 | static int jfs_readpage(struct file *file, struct page *page) | |
276 | { | |
277 | return mpage_readpage(page, jfs_get_block); | |
278 | } | |
279 | ||
280 | static int jfs_readpages(struct file *file, struct address_space *mapping, | |
281 | struct list_head *pages, unsigned nr_pages) | |
282 | { | |
283 | return mpage_readpages(mapping, pages, nr_pages, jfs_get_block); | |
284 | } | |
285 | ||
286 | static int jfs_prepare_write(struct file *file, | |
287 | struct page *page, unsigned from, unsigned to) | |
288 | { | |
289 | return nobh_prepare_write(page, from, to, jfs_get_block); | |
290 | } | |
291 | ||
292 | static sector_t jfs_bmap(struct address_space *mapping, sector_t block) | |
293 | { | |
294 | return generic_block_bmap(mapping, block, jfs_get_block); | |
295 | } | |
296 | ||
297 | static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb, | |
298 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
299 | { | |
300 | struct file *file = iocb->ki_filp; | |
301 | struct inode *inode = file->f_mapping->host; | |
302 | ||
303 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
304 | offset, nr_segs, jfs_get_blocks, NULL); | |
305 | } | |
306 | ||
307 | struct address_space_operations jfs_aops = { | |
308 | .readpage = jfs_readpage, | |
309 | .readpages = jfs_readpages, | |
310 | .writepage = jfs_writepage, | |
311 | .writepages = jfs_writepages, | |
312 | .sync_page = block_sync_page, | |
313 | .prepare_write = jfs_prepare_write, | |
314 | .commit_write = nobh_commit_write, | |
315 | .bmap = jfs_bmap, | |
316 | .direct_IO = jfs_direct_IO, | |
317 | }; | |
318 | ||
319 | /* | |
320 | * Guts of jfs_truncate. Called with locks already held. Can be called | |
321 | * with directory for truncating directory index table. | |
322 | */ | |
323 | void jfs_truncate_nolock(struct inode *ip, loff_t length) | |
324 | { | |
325 | loff_t newsize; | |
326 | tid_t tid; | |
327 | ||
328 | ASSERT(length >= 0); | |
329 | ||
330 | if (test_cflag(COMMIT_Nolink, ip)) { | |
331 | xtTruncate(0, ip, length, COMMIT_WMAP); | |
332 | return; | |
333 | } | |
334 | ||
335 | do { | |
336 | tid = txBegin(ip->i_sb, 0); | |
337 | ||
338 | /* | |
339 | * The commit_sem cannot be taken before txBegin. | |
340 | * txBegin may block and there is a chance the inode | |
341 | * could be marked dirty and need to be committed | |
342 | * before txBegin unblocks | |
343 | */ | |
344 | down(&JFS_IP(ip)->commit_sem); | |
345 | ||
346 | newsize = xtTruncate(tid, ip, length, | |
347 | COMMIT_TRUNCATE | COMMIT_PWMAP); | |
348 | if (newsize < 0) { | |
349 | txEnd(tid); | |
350 | up(&JFS_IP(ip)->commit_sem); | |
351 | break; | |
352 | } | |
353 | ||
354 | ip->i_mtime = ip->i_ctime = CURRENT_TIME; | |
355 | mark_inode_dirty(ip); | |
356 | ||
357 | txCommit(tid, 1, &ip, 0); | |
358 | txEnd(tid); | |
359 | up(&JFS_IP(ip)->commit_sem); | |
360 | } while (newsize > length); /* Truncate isn't always atomic */ | |
361 | } | |
362 | ||
363 | void jfs_truncate(struct inode *ip) | |
364 | { | |
365 | jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size); | |
366 | ||
367 | nobh_truncate_page(ip->i_mapping, ip->i_size); | |
368 | ||
369 | IWRITE_LOCK(ip); | |
370 | jfs_truncate_nolock(ip, ip->i_size); | |
371 | IWRITE_UNLOCK(ip); | |
372 | } |