blob: 4672013802e126a9f0d0da9f14947ebfa6830cb9 [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 }
58}
59
60/*
61 * Workhorse of both fsync & write_inode
62 */
63int jfs_commit_inode(struct inode *inode, int wait)
64{
65 int rc = 0;
66 tid_t tid;
67 static int noisy = 5;
68
69 jfs_info("In jfs_commit_inode, inode = 0x%p", inode);
70
71 /*
72 * Don't commit if inode has been committed since last being
73 * marked dirty, or if it has been deleted.
74 */
75 if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode))
76 return 0;
77
78 if (isReadOnly(inode)) {
79 /* kernel allows writes to devices on read-only
80 * partitions and may think inode is dirty
81 */
82 if (!special_file(inode->i_mode) && noisy) {
83 jfs_err("jfs_commit_inode(0x%p) called on "
84 "read-only volume", inode);
85 jfs_err("Is remount racy?");
86 noisy--;
87 }
88 return 0;
89 }
90
91 tid = txBegin(inode->i_sb, COMMIT_INODE);
Ingo Molnar1de87442006-01-24 15:22:50 -060092 mutex_lock(&JFS_IP(inode)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
94 /*
Ingo Molnar1de87442006-01-24 15:22:50 -060095 * Retest inode state after taking commit_mutex
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 */
97 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
98 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
99
100 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600101 mutex_unlock(&JFS_IP(inode)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 return rc;
103}
104
105int jfs_write_inode(struct inode *inode, int wait)
106{
107 if (test_cflag(COMMIT_Nolink, inode))
108 return 0;
109 /*
110 * If COMMIT_DIRTY is not set, the inode isn't really dirty.
111 * It has been committed since the last change, but was still
112 * on the dirty inode list.
113 */
114 if (!test_cflag(COMMIT_Dirty, inode)) {
115 /* Make sure committed changes hit the disk */
116 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
117 return 0;
118 }
119
120 if (jfs_commit_inode(inode, wait)) {
121 jfs_err("jfs_write_inode: jfs_commit_inode failed!");
122 return -EIO;
123 } else
124 return 0;
125}
126
127void jfs_delete_inode(struct inode *inode)
128{
129 jfs_info("In jfs_delete_inode, inode = 0x%p", inode);
130
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500131 if (!is_bad_inode(inode) &&
Dave Kleikamp6cb12692005-09-15 23:25:41 -0500132 (JFS_IP(inode)->fileset == FILESYSTEM_I)) {
Linus Torvalds32983692005-09-11 10:14:54 -0700133 truncate_inode_pages(&inode->i_data, 0);
Mark Fashehfef26652005-09-09 13:01:31 -0700134
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500135 if (test_cflag(COMMIT_Freewmap, inode))
136 jfs_free_zero_link(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500138 diFree(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500140 /*
141 * Free the inode from the quota allocation.
142 */
143 DQUOT_INIT(inode);
144 DQUOT_FREE_INODE(inode);
145 DQUOT_DROP(inode);
146 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148 clear_inode(inode);
149}
150
151void jfs_dirty_inode(struct inode *inode)
152{
153 static int noisy = 5;
154
155 if (isReadOnly(inode)) {
156 if (!special_file(inode->i_mode) && noisy) {
157 /* kernel allows writes to devices on read-only
158 * partitions and may try to mark inode dirty
159 */
160 jfs_err("jfs_dirty_inode called on read-only volume");
161 jfs_err("Is remount racy?");
162 noisy--;
163 }
164 return;
165 }
166
167 set_cflag(COMMIT_Dirty, inode);
168}
169
Dave Kleikamp115ff502006-07-26 14:52:13 -0500170int jfs_get_block(struct inode *ip, sector_t lblock,
171 struct buffer_head *bh_result, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172{
173 s64 lblock64 = lblock;
174 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 xad_t xad;
176 s64 xaddr;
177 int xflag;
Dave Kleikamp115ff502006-07-26 14:52:13 -0500178 s32 xlen = bh_result->b_size >> ip->i_blkbits;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 * Take appropriate lock on inode
182 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600183 if (create)
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600184 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600185 else
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600186 IREAD_LOCK(ip, RDWRLOCK_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
188 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
Dave Kleikamp115ff502006-07-26 14:52:13 -0500189 (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
Dave Kleikamp66284652005-05-02 12:25:13 -0600190 xaddr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 if (xflag & XAD_NOTRECORDED) {
192 if (!create)
193 /*
194 * Allocated but not recorded, read treats
195 * this as a hole
196 */
197 goto unlock;
198#ifdef _JFS_4K
199 XADoffset(&xad, lblock64);
200 XADlength(&xad, xlen);
201 XADaddress(&xad, xaddr);
202#else /* _JFS_4K */
203 /*
204 * As long as block size = 4K, this isn't a problem.
205 * We should mark the whole page not ABNR, but how
206 * will we know to mark the other blocks BH_New?
207 */
208 BUG();
209#endif /* _JFS_4K */
210 rc = extRecord(ip, &xad);
211 if (rc)
212 goto unlock;
213 set_buffer_new(bh_result);
214 }
215
216 map_bh(bh_result, ip->i_sb, xaddr);
217 bh_result->b_size = xlen << ip->i_blkbits;
218 goto unlock;
219 }
220 if (!create)
221 goto unlock;
222
223 /*
224 * Allocate a new block
225 */
226#ifdef _JFS_4K
227 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
228 goto unlock;
Richard Knutsson4d817152006-09-30 23:27:14 -0700229 rc = extAlloc(ip, xlen, lblock64, &xad, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 if (rc)
231 goto unlock;
232
233 set_buffer_new(bh_result);
234 map_bh(bh_result, ip->i_sb, addressXAD(&xad));
235 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
236
237#else /* _JFS_4K */
238 /*
239 * We need to do whatever it takes to keep all but the last buffers
240 * in 4K pages - see jfs_write.c
241 */
242 BUG();
243#endif /* _JFS_4K */
244
245 unlock:
246 /*
247 * Release lock on inode
248 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600249 if (create)
250 IWRITE_UNLOCK(ip);
251 else
252 IREAD_UNLOCK(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 return rc;
254}
255
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256static int jfs_writepage(struct page *page, struct writeback_control *wbc)
257{
Nick Piggind5c5f842007-10-16 01:25:22 -0700258 return block_write_full_page(page, jfs_get_block, wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259}
260
261static int jfs_writepages(struct address_space *mapping,
262 struct writeback_control *wbc)
263{
264 return mpage_writepages(mapping, wbc, jfs_get_block);
265}
266
267static int jfs_readpage(struct file *file, struct page *page)
268{
269 return mpage_readpage(page, jfs_get_block);
270}
271
272static int jfs_readpages(struct file *file, struct address_space *mapping,
273 struct list_head *pages, unsigned nr_pages)
274{
275 return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
276}
277
Nick Piggind5c5f842007-10-16 01:25:22 -0700278static int jfs_write_begin(struct file *file, struct address_space *mapping,
279 loff_t pos, unsigned len, unsigned flags,
280 struct page **pagep, void **fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281{
Nick Piggin03158cd2007-10-16 01:25:25 -0700282 return nobh_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
Nick Piggind5c5f842007-10-16 01:25:22 -0700283 jfs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284}
285
286static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
287{
288 return generic_block_bmap(mapping, block, jfs_get_block);
289}
290
291static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb,
292 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
293{
294 struct file *file = iocb->ki_filp;
295 struct inode *inode = file->f_mapping->host;
296
297 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
Badari Pulavarty1d8fa7a2006-03-26 01:38:02 -0800298 offset, nr_segs, jfs_get_block, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299}
300
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700301const struct address_space_operations jfs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 .readpage = jfs_readpage,
303 .readpages = jfs_readpages,
304 .writepage = jfs_writepage,
305 .writepages = jfs_writepages,
306 .sync_page = block_sync_page,
Nick Piggind5c5f842007-10-16 01:25:22 -0700307 .write_begin = jfs_write_begin,
Nick Piggin03158cd2007-10-16 01:25:25 -0700308 .write_end = nobh_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 .bmap = jfs_bmap,
310 .direct_IO = jfs_direct_IO,
311};
312
313/*
314 * Guts of jfs_truncate. Called with locks already held. Can be called
315 * with directory for truncating directory index table.
316 */
317void jfs_truncate_nolock(struct inode *ip, loff_t length)
318{
319 loff_t newsize;
320 tid_t tid;
321
322 ASSERT(length >= 0);
323
324 if (test_cflag(COMMIT_Nolink, ip)) {
325 xtTruncate(0, ip, length, COMMIT_WMAP);
326 return;
327 }
328
329 do {
330 tid = txBegin(ip->i_sb, 0);
331
332 /*
Ingo Molnar1de87442006-01-24 15:22:50 -0600333 * The commit_mutex cannot be taken before txBegin.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 * txBegin may block and there is a chance the inode
335 * could be marked dirty and need to be committed
336 * before txBegin unblocks
337 */
Ingo Molnar1de87442006-01-24 15:22:50 -0600338 mutex_lock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
340 newsize = xtTruncate(tid, ip, length,
341 COMMIT_TRUNCATE | COMMIT_PWMAP);
342 if (newsize < 0) {
343 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600344 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 break;
346 }
347
348 ip->i_mtime = ip->i_ctime = CURRENT_TIME;
349 mark_inode_dirty(ip);
350
351 txCommit(tid, 1, &ip, 0);
352 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600353 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 } while (newsize > length); /* Truncate isn't always atomic */
355}
356
357void jfs_truncate(struct inode *ip)
358{
359 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
360
Nick Piggin03158cd2007-10-16 01:25:25 -0700361 nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600363 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 jfs_truncate_nolock(ip, ip->i_size);
365 IWRITE_UNLOCK(ip);
366}