blob: 9dd126276c9f429c2be8990bca4af460d8d2a2af [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>
Christoph Hellwiga9185b42010-03-05 09:21:37 +010025#include <linux/writeback.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include "jfs_incore.h"
Dave Kleikamp1868f4a2005-05-04 15:29:35 -050027#include "jfs_inode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#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
David Howellseab1df72008-02-07 00:15:43 -080035struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -070036{
David Howellseab1df72008-02-07 00:15:43 -080037 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 }
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;
Dave Kleikampd69e83d2008-12-16 10:21:34 -060063 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 inode->i_op = &jfs_symlink_inode_operations;
Dave Kleikampd69e83d2008-12-16 10:21:34 -060065 /*
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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 } else {
72 inode->i_op = &jfs_file_inode_operations;
73 init_special_inode(inode, inode->i_mode, inode->i_rdev);
74 }
David Howellseab1df72008-02-07 00:15:43 -080075 unlock_new_inode(inode);
76 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077}
78
79/*
80 * Workhorse of both fsync & write_inode
81 */
82int 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);
Ingo Molnar1de87442006-01-24 15:22:50 -0600111 mutex_lock(&JFS_IP(inode)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113 /*
Ingo Molnar1de87442006-01-24 15:22:50 -0600114 * Retest inode state after taking commit_mutex
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 */
116 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
117 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
118
119 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600120 mutex_unlock(&JFS_IP(inode)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 return rc;
122}
123
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100124int jfs_write_inode(struct inode *inode, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100126 int wait = wbc->sync_mode == WB_SYNC_ALL;
127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 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
148void jfs_delete_inode(struct inode *inode)
149{
150 jfs_info("In jfs_delete_inode, inode = 0x%p", inode);
151
Christoph Hellwig907f4552010-03-03 09:05:06 -0500152 if (!is_bad_inode(inode))
Christoph Hellwig871a2932010-03-03 09:05:07 -0500153 dquot_initialize(inode);
Christoph Hellwig907f4552010-03-03 09:05:06 -0500154
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500155 if (!is_bad_inode(inode) &&
Dave Kleikamp6cb12692005-09-15 23:25:41 -0500156 (JFS_IP(inode)->fileset == FILESYSTEM_I)) {
Linus Torvalds32983692005-09-11 10:14:54 -0700157 truncate_inode_pages(&inode->i_data, 0);
Mark Fashehfef26652005-09-09 13:01:31 -0700158
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500159 if (test_cflag(COMMIT_Freewmap, inode))
160 jfs_free_zero_link(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500162 diFree(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500164 /*
165 * Free the inode from the quota allocation.
166 */
Christoph Hellwig871a2932010-03-03 09:05:07 -0500167 dquot_initialize(inode);
Christoph Hellwig63936dd2010-03-03 09:05:01 -0500168 dquot_free_inode(inode);
Christoph Hellwig9f754752010-03-03 09:05:05 -0500169 dquot_drop(inode);
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500170 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
172 clear_inode(inode);
173}
174
175void jfs_dirty_inode(struct inode *inode)
176{
177 static int noisy = 5;
178
179 if (isReadOnly(inode)) {
180 if (!special_file(inode->i_mode) && noisy) {
181 /* kernel allows writes to devices on read-only
182 * partitions and may try to mark inode dirty
183 */
184 jfs_err("jfs_dirty_inode called on read-only volume");
185 jfs_err("Is remount racy?");
186 noisy--;
187 }
188 return;
189 }
190
191 set_cflag(COMMIT_Dirty, inode);
192}
193
Dave Kleikamp115ff502006-07-26 14:52:13 -0500194int jfs_get_block(struct inode *ip, sector_t lblock,
195 struct buffer_head *bh_result, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
197 s64 lblock64 = lblock;
198 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 xad_t xad;
200 s64 xaddr;
201 int xflag;
Dave Kleikamp115ff502006-07-26 14:52:13 -0500202 s32 xlen = bh_result->b_size >> ip->i_blkbits;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
204 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 * Take appropriate lock on inode
206 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600207 if (create)
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600208 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600209 else
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600210 IREAD_LOCK(ip, RDWRLOCK_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
212 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
Dave Kleikamp115ff502006-07-26 14:52:13 -0500213 (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
Dave Kleikamp66284652005-05-02 12:25:13 -0600214 xaddr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 if (xflag & XAD_NOTRECORDED) {
216 if (!create)
217 /*
218 * Allocated but not recorded, read treats
219 * this as a hole
220 */
221 goto unlock;
222#ifdef _JFS_4K
223 XADoffset(&xad, lblock64);
224 XADlength(&xad, xlen);
225 XADaddress(&xad, xaddr);
226#else /* _JFS_4K */
227 /*
228 * As long as block size = 4K, this isn't a problem.
229 * We should mark the whole page not ABNR, but how
230 * will we know to mark the other blocks BH_New?
231 */
232 BUG();
233#endif /* _JFS_4K */
234 rc = extRecord(ip, &xad);
235 if (rc)
236 goto unlock;
237 set_buffer_new(bh_result);
238 }
239
240 map_bh(bh_result, ip->i_sb, xaddr);
241 bh_result->b_size = xlen << ip->i_blkbits;
242 goto unlock;
243 }
244 if (!create)
245 goto unlock;
246
247 /*
248 * Allocate a new block
249 */
250#ifdef _JFS_4K
251 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
252 goto unlock;
Richard Knutsson4d817152006-09-30 23:27:14 -0700253 rc = extAlloc(ip, xlen, lblock64, &xad, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 if (rc)
255 goto unlock;
256
257 set_buffer_new(bh_result);
258 map_bh(bh_result, ip->i_sb, addressXAD(&xad));
259 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
260
261#else /* _JFS_4K */
262 /*
263 * We need to do whatever it takes to keep all but the last buffers
264 * in 4K pages - see jfs_write.c
265 */
266 BUG();
267#endif /* _JFS_4K */
268
269 unlock:
270 /*
271 * Release lock on inode
272 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600273 if (create)
274 IWRITE_UNLOCK(ip);
275 else
276 IREAD_UNLOCK(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 return rc;
278}
279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280static int jfs_writepage(struct page *page, struct writeback_control *wbc)
281{
Nick Piggind5c5f842007-10-16 01:25:22 -0700282 return block_write_full_page(page, jfs_get_block, wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
285static int jfs_writepages(struct address_space *mapping,
286 struct writeback_control *wbc)
287{
288 return mpage_writepages(mapping, wbc, jfs_get_block);
289}
290
291static int jfs_readpage(struct file *file, struct page *page)
292{
293 return mpage_readpage(page, jfs_get_block);
294}
295
296static int jfs_readpages(struct file *file, struct address_space *mapping,
297 struct list_head *pages, unsigned nr_pages)
298{
299 return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
300}
301
Nick Piggind5c5f842007-10-16 01:25:22 -0700302static int jfs_write_begin(struct file *file, struct address_space *mapping,
303 loff_t pos, unsigned len, unsigned flags,
304 struct page **pagep, void **fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305{
Nick Piggin03158cd2007-10-16 01:25:25 -0700306 return nobh_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
Nick Piggind5c5f842007-10-16 01:25:22 -0700307 jfs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308}
309
310static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
311{
312 return generic_block_bmap(mapping, block, jfs_get_block);
313}
314
315static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb,
316 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
317{
318 struct file *file = iocb->ki_filp;
319 struct inode *inode = file->f_mapping->host;
320
321 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -0800322 offset, nr_segs, jfs_get_block, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323}
324
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700325const struct address_space_operations jfs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 .readpage = jfs_readpage,
327 .readpages = jfs_readpages,
328 .writepage = jfs_writepage,
329 .writepages = jfs_writepages,
330 .sync_page = block_sync_page,
Nick Piggind5c5f842007-10-16 01:25:22 -0700331 .write_begin = jfs_write_begin,
Nick Piggin03158cd2007-10-16 01:25:25 -0700332 .write_end = nobh_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 .bmap = jfs_bmap,
334 .direct_IO = jfs_direct_IO,
335};
336
337/*
338 * Guts of jfs_truncate. Called with locks already held. Can be called
339 * with directory for truncating directory index table.
340 */
341void jfs_truncate_nolock(struct inode *ip, loff_t length)
342{
343 loff_t newsize;
344 tid_t tid;
345
346 ASSERT(length >= 0);
347
348 if (test_cflag(COMMIT_Nolink, ip)) {
349 xtTruncate(0, ip, length, COMMIT_WMAP);
350 return;
351 }
352
353 do {
354 tid = txBegin(ip->i_sb, 0);
355
356 /*
Ingo Molnar1de87442006-01-24 15:22:50 -0600357 * The commit_mutex cannot be taken before txBegin.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 * txBegin may block and there is a chance the inode
359 * could be marked dirty and need to be committed
360 * before txBegin unblocks
361 */
Ingo Molnar1de87442006-01-24 15:22:50 -0600362 mutex_lock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
364 newsize = xtTruncate(tid, ip, length,
365 COMMIT_TRUNCATE | COMMIT_PWMAP);
366 if (newsize < 0) {
367 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600368 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 break;
370 }
371
372 ip->i_mtime = ip->i_ctime = CURRENT_TIME;
373 mark_inode_dirty(ip);
374
375 txCommit(tid, 1, &ip, 0);
376 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600377 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 } while (newsize > length); /* Truncate isn't always atomic */
379}
380
381void jfs_truncate(struct inode *ip)
382{
383 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
384
Nick Piggin03158cd2007-10-16 01:25:25 -0700385 nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600387 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 jfs_truncate_nolock(ip, ip->i_size);
389 IWRITE_UNLOCK(ip);
390}