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