Root/
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 <linux/writeback.h> |
26 | #include "jfs_incore.h" |
27 | #include "jfs_inode.h" |
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 | |
35 | struct inode *jfs_iget(struct super_block *sb, unsigned long ino) |
36 | { |
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); |
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; |
63 | } else { |
64 | inode->i_op = &jfs_fast_symlink_inode_operations; |
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 | } |
71 | } else { |
72 | inode->i_op = &jfs_file_inode_operations; |
73 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
74 | } |
75 | unlock_new_inode(inode); |
76 | return inode; |
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); |
111 | mutex_lock(&JFS_IP(inode)->commit_mutex); |
112 | |
113 | /* |
114 | * Retest inode state after taking commit_mutex |
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); |
120 | mutex_unlock(&JFS_IP(inode)->commit_mutex); |
121 | return rc; |
122 | } |
123 | |
124 | int jfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
125 | { |
126 | int wait = wbc->sync_mode == WB_SYNC_ALL; |
127 | |
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_evict_inode(struct inode *inode) |
149 | { |
150 | jfs_info("In jfs_evict_inode, inode = 0x%p", inode); |
151 | |
152 | if (!inode->i_nlink && !is_bad_inode(inode)) { |
153 | dquot_initialize(inode); |
154 | |
155 | if (JFS_IP(inode)->fileset == FILESYSTEM_I) { |
156 | truncate_inode_pages(&inode->i_data, 0); |
157 | |
158 | if (test_cflag(COMMIT_Freewmap, inode)) |
159 | jfs_free_zero_link(inode); |
160 | |
161 | diFree(inode); |
162 | |
163 | /* |
164 | * Free the inode from the quota allocation. |
165 | */ |
166 | dquot_initialize(inode); |
167 | dquot_free_inode(inode); |
168 | } |
169 | } else { |
170 | truncate_inode_pages(&inode->i_data, 0); |
171 | } |
172 | end_writeback(inode); |
173 | dquot_drop(inode); |
174 | } |
175 | |
176 | void jfs_dirty_inode(struct inode *inode, int flags) |
177 | { |
178 | static int noisy = 5; |
179 | |
180 | if (isReadOnly(inode)) { |
181 | if (!special_file(inode->i_mode) && noisy) { |
182 | /* kernel allows writes to devices on read-only |
183 | * partitions and may try to mark inode dirty |
184 | */ |
185 | jfs_err("jfs_dirty_inode called on read-only volume"); |
186 | jfs_err("Is remount racy?"); |
187 | noisy--; |
188 | } |
189 | return; |
190 | } |
191 | |
192 | set_cflag(COMMIT_Dirty, inode); |
193 | } |
194 | |
195 | int jfs_get_block(struct inode *ip, sector_t lblock, |
196 | struct buffer_head *bh_result, int create) |
197 | { |
198 | s64 lblock64 = lblock; |
199 | int rc = 0; |
200 | xad_t xad; |
201 | s64 xaddr; |
202 | int xflag; |
203 | s32 xlen = bh_result->b_size >> ip->i_blkbits; |
204 | |
205 | /* |
206 | * Take appropriate lock on inode |
207 | */ |
208 | if (create) |
209 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
210 | else |
211 | IREAD_LOCK(ip, RDWRLOCK_NORMAL); |
212 | |
213 | if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) && |
214 | (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) && |
215 | xaddr) { |
216 | if (xflag & XAD_NOTRECORDED) { |
217 | if (!create) |
218 | /* |
219 | * Allocated but not recorded, read treats |
220 | * this as a hole |
221 | */ |
222 | goto unlock; |
223 | #ifdef _JFS_4K |
224 | XADoffset(&xad, lblock64); |
225 | XADlength(&xad, xlen); |
226 | XADaddress(&xad, xaddr); |
227 | #else /* _JFS_4K */ |
228 | /* |
229 | * As long as block size = 4K, this isn't a problem. |
230 | * We should mark the whole page not ABNR, but how |
231 | * will we know to mark the other blocks BH_New? |
232 | */ |
233 | BUG(); |
234 | #endif /* _JFS_4K */ |
235 | rc = extRecord(ip, &xad); |
236 | if (rc) |
237 | goto unlock; |
238 | set_buffer_new(bh_result); |
239 | } |
240 | |
241 | map_bh(bh_result, ip->i_sb, xaddr); |
242 | bh_result->b_size = xlen << ip->i_blkbits; |
243 | goto unlock; |
244 | } |
245 | if (!create) |
246 | goto unlock; |
247 | |
248 | /* |
249 | * Allocate a new block |
250 | */ |
251 | #ifdef _JFS_4K |
252 | if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad))) |
253 | goto unlock; |
254 | rc = extAlloc(ip, xlen, lblock64, &xad, false); |
255 | if (rc) |
256 | goto unlock; |
257 | |
258 | set_buffer_new(bh_result); |
259 | map_bh(bh_result, ip->i_sb, addressXAD(&xad)); |
260 | bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits; |
261 | |
262 | #else /* _JFS_4K */ |
263 | /* |
264 | * We need to do whatever it takes to keep all but the last buffers |
265 | * in 4K pages - see jfs_write.c |
266 | */ |
267 | BUG(); |
268 | #endif /* _JFS_4K */ |
269 | |
270 | unlock: |
271 | /* |
272 | * Release lock on inode |
273 | */ |
274 | if (create) |
275 | IWRITE_UNLOCK(ip); |
276 | else |
277 | IREAD_UNLOCK(ip); |
278 | return rc; |
279 | } |
280 | |
281 | static int jfs_writepage(struct page *page, struct writeback_control *wbc) |
282 | { |
283 | return block_write_full_page(page, jfs_get_block, wbc); |
284 | } |
285 | |
286 | static int jfs_writepages(struct address_space *mapping, |
287 | struct writeback_control *wbc) |
288 | { |
289 | return mpage_writepages(mapping, wbc, jfs_get_block); |
290 | } |
291 | |
292 | static int jfs_readpage(struct file *file, struct page *page) |
293 | { |
294 | return mpage_readpage(page, jfs_get_block); |
295 | } |
296 | |
297 | static int jfs_readpages(struct file *file, struct address_space *mapping, |
298 | struct list_head *pages, unsigned nr_pages) |
299 | { |
300 | return mpage_readpages(mapping, pages, nr_pages, jfs_get_block); |
301 | } |
302 | |
303 | static int jfs_write_begin(struct file *file, struct address_space *mapping, |
304 | loff_t pos, unsigned len, unsigned flags, |
305 | struct page **pagep, void **fsdata) |
306 | { |
307 | int ret; |
308 | |
309 | ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata, |
310 | jfs_get_block); |
311 | if (unlikely(ret)) { |
312 | loff_t isize = mapping->host->i_size; |
313 | if (pos + len > isize) |
314 | vmtruncate(mapping->host, isize); |
315 | } |
316 | |
317 | return ret; |
318 | } |
319 | |
320 | static sector_t jfs_bmap(struct address_space *mapping, sector_t block) |
321 | { |
322 | return generic_block_bmap(mapping, block, jfs_get_block); |
323 | } |
324 | |
325 | static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb, |
326 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) |
327 | { |
328 | struct file *file = iocb->ki_filp; |
329 | struct inode *inode = file->f_mapping->host; |
330 | ssize_t ret; |
331 | |
332 | ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, |
333 | offset, nr_segs, jfs_get_block, NULL); |
334 | |
335 | /* |
336 | * In case of error extending write may have instantiated a few |
337 | * blocks outside i_size. Trim these off again. |
338 | */ |
339 | if (unlikely((rw & WRITE) && ret < 0)) { |
340 | loff_t isize = i_size_read(inode); |
341 | loff_t end = offset + iov_length(iov, nr_segs); |
342 | |
343 | if (end > isize) |
344 | vmtruncate(inode, isize); |
345 | } |
346 | |
347 | return ret; |
348 | } |
349 | |
350 | const struct address_space_operations jfs_aops = { |
351 | .readpage = jfs_readpage, |
352 | .readpages = jfs_readpages, |
353 | .writepage = jfs_writepage, |
354 | .writepages = jfs_writepages, |
355 | .write_begin = jfs_write_begin, |
356 | .write_end = nobh_write_end, |
357 | .bmap = jfs_bmap, |
358 | .direct_IO = jfs_direct_IO, |
359 | }; |
360 | |
361 | /* |
362 | * Guts of jfs_truncate. Called with locks already held. Can be called |
363 | * with directory for truncating directory index table. |
364 | */ |
365 | void jfs_truncate_nolock(struct inode *ip, loff_t length) |
366 | { |
367 | loff_t newsize; |
368 | tid_t tid; |
369 | |
370 | ASSERT(length >= 0); |
371 | |
372 | if (test_cflag(COMMIT_Nolink, ip)) { |
373 | xtTruncate(0, ip, length, COMMIT_WMAP); |
374 | return; |
375 | } |
376 | |
377 | do { |
378 | tid = txBegin(ip->i_sb, 0); |
379 | |
380 | /* |
381 | * The commit_mutex cannot be taken before txBegin. |
382 | * txBegin may block and there is a chance the inode |
383 | * could be marked dirty and need to be committed |
384 | * before txBegin unblocks |
385 | */ |
386 | mutex_lock(&JFS_IP(ip)->commit_mutex); |
387 | |
388 | newsize = xtTruncate(tid, ip, length, |
389 | COMMIT_TRUNCATE | COMMIT_PWMAP); |
390 | if (newsize < 0) { |
391 | txEnd(tid); |
392 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
393 | break; |
394 | } |
395 | |
396 | ip->i_mtime = ip->i_ctime = CURRENT_TIME; |
397 | mark_inode_dirty(ip); |
398 | |
399 | txCommit(tid, 1, &ip, 0); |
400 | txEnd(tid); |
401 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
402 | } while (newsize > length); /* Truncate isn't always atomic */ |
403 | } |
404 | |
405 | void jfs_truncate(struct inode *ip) |
406 | { |
407 | jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size); |
408 | |
409 | nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block); |
410 | |
411 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
412 | jfs_truncate_nolock(ip, ip->i_size); |
413 | IWRITE_UNLOCK(ip); |
414 | } |
415 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9