blob: b00ee9f05a0695f0a84814ae15320aaac1a58aa8 [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
David Howellseab1df72008-02-07 00:15:43 -080034struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -070035{
David Howellseab1df72008-02-07 00:15:43 -080036 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 }
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;
Dave Kleikampd69e83d2008-12-16 10:21:34 -060062 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 inode->i_op = &jfs_symlink_inode_operations;
Dave Kleikampd69e83d2008-12-16 10:21:34 -060064 /*
65 * The inline data should be null-terminated, but
66 * don't let on-disk corruption crash the kernel
67 */
68 JFS_IP(inode)->i_inline[inode->i_size] = '\0';
69 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 } else {
71 inode->i_op = &jfs_file_inode_operations;
72 init_special_inode(inode, inode->i_mode, inode->i_rdev);
73 }
David Howellseab1df72008-02-07 00:15:43 -080074 unlock_new_inode(inode);
75 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076}
77
78/*
79 * Workhorse of both fsync & write_inode
80 */
81int jfs_commit_inode(struct inode *inode, int wait)
82{
83 int rc = 0;
84 tid_t tid;
85 static int noisy = 5;
86
87 jfs_info("In jfs_commit_inode, inode = 0x%p", inode);
88
89 /*
90 * Don't commit if inode has been committed since last being
91 * marked dirty, or if it has been deleted.
92 */
93 if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode))
94 return 0;
95
96 if (isReadOnly(inode)) {
97 /* kernel allows writes to devices on read-only
98 * partitions and may think inode is dirty
99 */
100 if (!special_file(inode->i_mode) && noisy) {
101 jfs_err("jfs_commit_inode(0x%p) called on "
102 "read-only volume", inode);
103 jfs_err("Is remount racy?");
104 noisy--;
105 }
106 return 0;
107 }
108
109 tid = txBegin(inode->i_sb, COMMIT_INODE);
Ingo Molnar1de87442006-01-24 15:22:50 -0600110 mutex_lock(&JFS_IP(inode)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
112 /*
Ingo Molnar1de87442006-01-24 15:22:50 -0600113 * Retest inode state after taking commit_mutex
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 */
115 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
116 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
117
118 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600119 mutex_unlock(&JFS_IP(inode)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 return rc;
121}
122
123int jfs_write_inode(struct inode *inode, int wait)
124{
125 if (test_cflag(COMMIT_Nolink, inode))
126 return 0;
127 /*
128 * If COMMIT_DIRTY is not set, the inode isn't really dirty.
129 * It has been committed since the last change, but was still
130 * on the dirty inode list.
131 */
132 if (!test_cflag(COMMIT_Dirty, inode)) {
133 /* Make sure committed changes hit the disk */
134 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
135 return 0;
136 }
137
138 if (jfs_commit_inode(inode, wait)) {
139 jfs_err("jfs_write_inode: jfs_commit_inode failed!");
140 return -EIO;
141 } else
142 return 0;
143}
144
145void jfs_delete_inode(struct inode *inode)
146{
147 jfs_info("In jfs_delete_inode, inode = 0x%p", inode);
148
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500149 if (!is_bad_inode(inode) &&
Dave Kleikamp6cb12692005-09-15 23:25:41 -0500150 (JFS_IP(inode)->fileset == FILESYSTEM_I)) {
Linus Torvalds32983692005-09-11 10:14:54 -0700151 truncate_inode_pages(&inode->i_data, 0);
Mark Fashehfef26652005-09-09 13:01:31 -0700152
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500153 if (test_cflag(COMMIT_Freewmap, inode))
154 jfs_free_zero_link(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500156 diFree(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500158 /*
159 * Free the inode from the quota allocation.
160 */
161 DQUOT_INIT(inode);
162 DQUOT_FREE_INODE(inode);
163 DQUOT_DROP(inode);
164 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
166 clear_inode(inode);
167}
168
169void jfs_dirty_inode(struct inode *inode)
170{
171 static int noisy = 5;
172
173 if (isReadOnly(inode)) {
174 if (!special_file(inode->i_mode) && noisy) {
175 /* kernel allows writes to devices on read-only
176 * partitions and may try to mark inode dirty
177 */
178 jfs_err("jfs_dirty_inode called on read-only volume");
179 jfs_err("Is remount racy?");
180 noisy--;
181 }
182 return;
183 }
184
185 set_cflag(COMMIT_Dirty, inode);
186}
187
Dave Kleikamp115ff502006-07-26 14:52:13 -0500188int jfs_get_block(struct inode *ip, sector_t lblock,
189 struct buffer_head *bh_result, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
191 s64 lblock64 = lblock;
192 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 xad_t xad;
194 s64 xaddr;
195 int xflag;
Dave Kleikamp115ff502006-07-26 14:52:13 -0500196 s32 xlen = bh_result->b_size >> ip->i_blkbits;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
198 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 * Take appropriate lock on inode
200 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600201 if (create)
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600202 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600203 else
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600204 IREAD_LOCK(ip, RDWRLOCK_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
206 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
Dave Kleikamp115ff502006-07-26 14:52:13 -0500207 (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
Dave Kleikamp66284652005-05-02 12:25:13 -0600208 xaddr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 if (xflag & XAD_NOTRECORDED) {
210 if (!create)
211 /*
212 * Allocated but not recorded, read treats
213 * this as a hole
214 */
215 goto unlock;
216#ifdef _JFS_4K
217 XADoffset(&xad, lblock64);
218 XADlength(&xad, xlen);
219 XADaddress(&xad, xaddr);
220#else /* _JFS_4K */
221 /*
222 * As long as block size = 4K, this isn't a problem.
223 * We should mark the whole page not ABNR, but how
224 * will we know to mark the other blocks BH_New?
225 */
226 BUG();
227#endif /* _JFS_4K */
228 rc = extRecord(ip, &xad);
229 if (rc)
230 goto unlock;
231 set_buffer_new(bh_result);
232 }
233
234 map_bh(bh_result, ip->i_sb, xaddr);
235 bh_result->b_size = xlen << ip->i_blkbits;
236 goto unlock;
237 }
238 if (!create)
239 goto unlock;
240
241 /*
242 * Allocate a new block
243 */
244#ifdef _JFS_4K
245 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
246 goto unlock;
Richard Knutsson4d817152006-09-30 23:27:14 -0700247 rc = extAlloc(ip, xlen, lblock64, &xad, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 if (rc)
249 goto unlock;
250
251 set_buffer_new(bh_result);
252 map_bh(bh_result, ip->i_sb, addressXAD(&xad));
253 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
254
255#else /* _JFS_4K */
256 /*
257 * We need to do whatever it takes to keep all but the last buffers
258 * in 4K pages - see jfs_write.c
259 */
260 BUG();
261#endif /* _JFS_4K */
262
263 unlock:
264 /*
265 * Release lock on inode
266 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600267 if (create)
268 IWRITE_UNLOCK(ip);
269 else
270 IREAD_UNLOCK(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 return rc;
272}
273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274static int jfs_writepage(struct page *page, struct writeback_control *wbc)
275{
Nick Piggind5c5f842007-10-16 01:25:22 -0700276 return block_write_full_page(page, jfs_get_block, wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277}
278
279static int jfs_writepages(struct address_space *mapping,
280 struct writeback_control *wbc)
281{
282 return mpage_writepages(mapping, wbc, jfs_get_block);
283}
284
285static int jfs_readpage(struct file *file, struct page *page)
286{
287 return mpage_readpage(page, jfs_get_block);
288}
289
290static int jfs_readpages(struct file *file, struct address_space *mapping,
291 struct list_head *pages, unsigned nr_pages)
292{
293 return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
294}
295
Nick Piggind5c5f842007-10-16 01:25:22 -0700296static int jfs_write_begin(struct file *file, struct address_space *mapping,
297 loff_t pos, unsigned len, unsigned flags,
298 struct page **pagep, void **fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299{
Nick Piggin03158cd2007-10-16 01:25:25 -0700300 return nobh_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
Nick Piggind5c5f842007-10-16 01:25:22 -0700301 jfs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302}
303
304static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
305{
306 return generic_block_bmap(mapping, block, jfs_get_block);
307}
308
309static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb,
310 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
311{
312 struct file *file = iocb->ki_filp;
313 struct inode *inode = file->f_mapping->host;
314
315 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -0800316 offset, nr_segs, jfs_get_block, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317}
318
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700319const struct address_space_operations jfs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 .readpage = jfs_readpage,
321 .readpages = jfs_readpages,
322 .writepage = jfs_writepage,
323 .writepages = jfs_writepages,
324 .sync_page = block_sync_page,
Nick Piggind5c5f842007-10-16 01:25:22 -0700325 .write_begin = jfs_write_begin,
Nick Piggin03158cd2007-10-16 01:25:25 -0700326 .write_end = nobh_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 .bmap = jfs_bmap,
328 .direct_IO = jfs_direct_IO,
329};
330
331/*
332 * Guts of jfs_truncate. Called with locks already held. Can be called
333 * with directory for truncating directory index table.
334 */
335void jfs_truncate_nolock(struct inode *ip, loff_t length)
336{
337 loff_t newsize;
338 tid_t tid;
339
340 ASSERT(length >= 0);
341
342 if (test_cflag(COMMIT_Nolink, ip)) {
343 xtTruncate(0, ip, length, COMMIT_WMAP);
344 return;
345 }
346
347 do {
348 tid = txBegin(ip->i_sb, 0);
349
350 /*
Ingo Molnar1de87442006-01-24 15:22:50 -0600351 * The commit_mutex cannot be taken before txBegin.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 * txBegin may block and there is a chance the inode
353 * could be marked dirty and need to be committed
354 * before txBegin unblocks
355 */
Ingo Molnar1de87442006-01-24 15:22:50 -0600356 mutex_lock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
358 newsize = xtTruncate(tid, ip, length,
359 COMMIT_TRUNCATE | COMMIT_PWMAP);
360 if (newsize < 0) {
361 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600362 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 break;
364 }
365
366 ip->i_mtime = ip->i_ctime = CURRENT_TIME;
367 mark_inode_dirty(ip);
368
369 txCommit(tid, 1, &ip, 0);
370 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600371 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 } while (newsize > length); /* Truncate isn't always atomic */
373}
374
375void jfs_truncate(struct inode *ip)
376{
377 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
378
Nick Piggin03158cd2007-10-16 01:25:25 -0700379 nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600381 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 jfs_truncate_nolock(ip, ip->i_size);
383 IWRITE_UNLOCK(ip);
384}