blob: f5719117edfe94e664e2dd46af752d7de8d9a142 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Dave Kleikamp63f83c92006-10-02 09:55:27 -05007 * the Free Software Foundation; either version 2 of the License, or
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * (at your option) any later version.
Dave Kleikamp63f83c92006-10-02 09:55:27 -05009 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * 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
Dave Kleikamp63f83c92006-10-02 09:55:27 -050016 * along with this program; if not, write to the Free Software
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 * 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"
Dave Kleikamp1868f4a2005-05-04 15:29:35 -050026#include "jfs_inode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070034void jfs_read_inode(struct inode *inode)
35{
Dave Kleikamp63f83c92006-10-02 09:55:27 -050036 if (diRead(inode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 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 }
Herbert Poetzlfa3241d2006-02-09 09:09:16 -060058 jfs_set_inode_flags(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059}
60
61/*
62 * Workhorse of both fsync & write_inode
63 */
64int jfs_commit_inode(struct inode *inode, int wait)
65{
66 int rc = 0;
67 tid_t tid;
68 static int noisy = 5;
69
70 jfs_info("In jfs_commit_inode, inode = 0x%p", inode);
71
72 /*
73 * Don't commit if inode has been committed since last being
74 * marked dirty, or if it has been deleted.
75 */
76 if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode))
77 return 0;
78
79 if (isReadOnly(inode)) {
80 /* kernel allows writes to devices on read-only
81 * partitions and may think inode is dirty
82 */
83 if (!special_file(inode->i_mode) && noisy) {
84 jfs_err("jfs_commit_inode(0x%p) called on "
85 "read-only volume", inode);
86 jfs_err("Is remount racy?");
87 noisy--;
88 }
89 return 0;
90 }
91
92 tid = txBegin(inode->i_sb, COMMIT_INODE);
Ingo Molnar1de87442006-01-24 15:22:50 -060093 mutex_lock(&JFS_IP(inode)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
95 /*
Ingo Molnar1de87442006-01-24 15:22:50 -060096 * Retest inode state after taking commit_mutex
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 */
98 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
99 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
100
101 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600102 mutex_unlock(&JFS_IP(inode)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 return rc;
104}
105
106int jfs_write_inode(struct inode *inode, int wait)
107{
108 if (test_cflag(COMMIT_Nolink, inode))
109 return 0;
110 /*
111 * If COMMIT_DIRTY is not set, the inode isn't really dirty.
112 * It has been committed since the last change, but was still
113 * on the dirty inode list.
114 */
115 if (!test_cflag(COMMIT_Dirty, inode)) {
116 /* Make sure committed changes hit the disk */
117 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
118 return 0;
119 }
120
121 if (jfs_commit_inode(inode, wait)) {
122 jfs_err("jfs_write_inode: jfs_commit_inode failed!");
123 return -EIO;
124 } else
125 return 0;
126}
127
128void jfs_delete_inode(struct inode *inode)
129{
130 jfs_info("In jfs_delete_inode, inode = 0x%p", inode);
131
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500132 if (!is_bad_inode(inode) &&
Dave Kleikamp6cb12692005-09-15 23:25:41 -0500133 (JFS_IP(inode)->fileset == FILESYSTEM_I)) {
Linus Torvalds32983692005-09-11 10:14:54 -0700134 truncate_inode_pages(&inode->i_data, 0);
Mark Fashehfef26652005-09-09 13:01:31 -0700135
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500136 if (test_cflag(COMMIT_Freewmap, inode))
137 jfs_free_zero_link(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500139 diFree(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500141 /*
142 * Free the inode from the quota allocation.
143 */
144 DQUOT_INIT(inode);
145 DQUOT_FREE_INODE(inode);
146 DQUOT_DROP(inode);
147 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149 clear_inode(inode);
150}
151
152void 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
Dave Kleikamp115ff502006-07-26 14:52:13 -0500171int jfs_get_block(struct inode *ip, sector_t lblock,
172 struct buffer_head *bh_result, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173{
174 s64 lblock64 = lblock;
175 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 xad_t xad;
177 s64 xaddr;
178 int xflag;
Dave Kleikamp115ff502006-07-26 14:52:13 -0500179 s32 xlen = bh_result->b_size >> ip->i_blkbits;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
181 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 * Take appropriate lock on inode
183 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600184 if (create)
185 IWRITE_LOCK(ip);
186 else
187 IREAD_LOCK(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
189 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
Dave Kleikamp115ff502006-07-26 14:52:13 -0500190 (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
Dave Kleikamp66284652005-05-02 12:25:13 -0600191 xaddr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 if (xflag & XAD_NOTRECORDED) {
193 if (!create)
194 /*
195 * Allocated but not recorded, read treats
196 * this as a hole
197 */
198 goto unlock;
199#ifdef _JFS_4K
200 XADoffset(&xad, lblock64);
201 XADlength(&xad, xlen);
202 XADaddress(&xad, xaddr);
203#else /* _JFS_4K */
204 /*
205 * As long as block size = 4K, this isn't a problem.
206 * We should mark the whole page not ABNR, but how
207 * will we know to mark the other blocks BH_New?
208 */
209 BUG();
210#endif /* _JFS_4K */
211 rc = extRecord(ip, &xad);
212 if (rc)
213 goto unlock;
214 set_buffer_new(bh_result);
215 }
216
217 map_bh(bh_result, ip->i_sb, xaddr);
218 bh_result->b_size = xlen << ip->i_blkbits;
219 goto unlock;
220 }
221 if (!create)
222 goto unlock;
223
224 /*
225 * Allocate a new block
226 */
227#ifdef _JFS_4K
228 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
229 goto unlock;
Richard Knutsson4d817152006-09-30 23:27:14 -0700230 rc = extAlloc(ip, xlen, lblock64, &xad, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 if (rc)
232 goto unlock;
233
234 set_buffer_new(bh_result);
235 map_bh(bh_result, ip->i_sb, addressXAD(&xad));
236 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
237
238#else /* _JFS_4K */
239 /*
240 * We need to do whatever it takes to keep all but the last buffers
241 * in 4K pages - see jfs_write.c
242 */
243 BUG();
244#endif /* _JFS_4K */
245
246 unlock:
247 /*
248 * Release lock on inode
249 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600250 if (create)
251 IWRITE_UNLOCK(ip);
252 else
253 IREAD_UNLOCK(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 return rc;
255}
256
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257static int jfs_writepage(struct page *page, struct writeback_control *wbc)
258{
259 return nobh_writepage(page, jfs_get_block, wbc);
260}
261
262static int jfs_writepages(struct address_space *mapping,
263 struct writeback_control *wbc)
264{
265 return mpage_writepages(mapping, wbc, jfs_get_block);
266}
267
268static int jfs_readpage(struct file *file, struct page *page)
269{
270 return mpage_readpage(page, jfs_get_block);
271}
272
273static int jfs_readpages(struct file *file, struct address_space *mapping,
274 struct list_head *pages, unsigned nr_pages)
275{
276 return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
277}
278
279static int jfs_prepare_write(struct file *file,
280 struct page *page, unsigned from, unsigned to)
281{
282 return nobh_prepare_write(page, from, to, jfs_get_block);
283}
284
285static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
286{
287 return generic_block_bmap(mapping, block, jfs_get_block);
288}
289
290static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb,
291 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
292{
293 struct file *file = iocb->ki_filp;
294 struct inode *inode = file->f_mapping->host;
295
296 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -0800297 offset, nr_segs, jfs_get_block, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298}
299
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700300const struct address_space_operations jfs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 .readpage = jfs_readpage,
302 .readpages = jfs_readpages,
303 .writepage = jfs_writepage,
304 .writepages = jfs_writepages,
305 .sync_page = block_sync_page,
306 .prepare_write = jfs_prepare_write,
307 .commit_write = nobh_commit_write,
308 .bmap = jfs_bmap,
309 .direct_IO = jfs_direct_IO,
310};
311
312/*
313 * Guts of jfs_truncate. Called with locks already held. Can be called
314 * with directory for truncating directory index table.
315 */
316void jfs_truncate_nolock(struct inode *ip, loff_t length)
317{
318 loff_t newsize;
319 tid_t tid;
320
321 ASSERT(length >= 0);
322
323 if (test_cflag(COMMIT_Nolink, ip)) {
324 xtTruncate(0, ip, length, COMMIT_WMAP);
325 return;
326 }
327
328 do {
329 tid = txBegin(ip->i_sb, 0);
330
331 /*
Ingo Molnar1de87442006-01-24 15:22:50 -0600332 * The commit_mutex cannot be taken before txBegin.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 * txBegin may block and there is a chance the inode
334 * could be marked dirty and need to be committed
335 * before txBegin unblocks
336 */
Ingo Molnar1de87442006-01-24 15:22:50 -0600337 mutex_lock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
339 newsize = xtTruncate(tid, ip, length,
340 COMMIT_TRUNCATE | COMMIT_PWMAP);
341 if (newsize < 0) {
342 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600343 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 break;
345 }
346
347 ip->i_mtime = ip->i_ctime = CURRENT_TIME;
348 mark_inode_dirty(ip);
349
350 txCommit(tid, 1, &ip, 0);
351 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600352 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 } while (newsize > length); /* Truncate isn't always atomic */
354}
355
356void jfs_truncate(struct inode *ip)
357{
358 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
359
360 nobh_truncate_page(ip->i_mapping, ip->i_size);
361
362 IWRITE_LOCK(ip);
363 jfs_truncate_nolock(ip, ip->i_size);
364 IWRITE_UNLOCK(ip);
365}