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