blob: 2137138c59b0a4c08839121f0b89c5a55699a9b0 [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
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"
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{
36 if (diRead(inode)) {
37 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);
92 down(&JFS_IP(inode)->commit_sem);
93
94 /*
95 * Retest inode state after taking commit_sem
96 */
97 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
98 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
99
100 txEnd(tid);
101 up(&JFS_IP(inode)->commit_sem);
102 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
131 if (test_cflag(COMMIT_Freewmap, inode))
Dave Kleikamp1868f4a2005-05-04 15:29:35 -0500132 jfs_free_zero_link(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
134 diFree(inode);
135
136 /*
137 * Free the inode from the quota allocation.
138 */
139 DQUOT_INIT(inode);
140 DQUOT_FREE_INODE(inode);
141 DQUOT_DROP(inode);
142
143 clear_inode(inode);
144}
145
146void jfs_dirty_inode(struct inode *inode)
147{
148 static int noisy = 5;
149
150 if (isReadOnly(inode)) {
151 if (!special_file(inode->i_mode) && noisy) {
152 /* kernel allows writes to devices on read-only
153 * partitions and may try to mark inode dirty
154 */
155 jfs_err("jfs_dirty_inode called on read-only volume");
156 jfs_err("Is remount racy?");
157 noisy--;
158 }
159 return;
160 }
161
162 set_cflag(COMMIT_Dirty, inode);
163}
164
165static int
166jfs_get_blocks(struct inode *ip, sector_t lblock, unsigned long max_blocks,
167 struct buffer_head *bh_result, int create)
168{
169 s64 lblock64 = lblock;
170 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 xad_t xad;
172 s64 xaddr;
173 int xflag;
Dave Kleikamp66284652005-05-02 12:25:13 -0600174 s32 xlen = max_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
176 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 * Take appropriate lock on inode
178 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600179 if (create)
180 IWRITE_LOCK(ip);
181 else
182 IREAD_LOCK(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
184 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600185 (!xtLookup(ip, lblock64, max_blocks, &xflag, &xaddr, &xlen, 0)) &&
Dave Kleikamp66284652005-05-02 12:25:13 -0600186 xaddr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 if (xflag & XAD_NOTRECORDED) {
188 if (!create)
189 /*
190 * Allocated but not recorded, read treats
191 * this as a hole
192 */
193 goto unlock;
194#ifdef _JFS_4K
195 XADoffset(&xad, lblock64);
196 XADlength(&xad, xlen);
197 XADaddress(&xad, xaddr);
198#else /* _JFS_4K */
199 /*
200 * As long as block size = 4K, this isn't a problem.
201 * We should mark the whole page not ABNR, but how
202 * will we know to mark the other blocks BH_New?
203 */
204 BUG();
205#endif /* _JFS_4K */
206 rc = extRecord(ip, &xad);
207 if (rc)
208 goto unlock;
209 set_buffer_new(bh_result);
210 }
211
212 map_bh(bh_result, ip->i_sb, xaddr);
213 bh_result->b_size = xlen << ip->i_blkbits;
214 goto unlock;
215 }
216 if (!create)
217 goto unlock;
218
219 /*
220 * Allocate a new block
221 */
222#ifdef _JFS_4K
223 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
224 goto unlock;
Dave Kleikamp66284652005-05-02 12:25:13 -0600225 rc = extAlloc(ip, xlen, lblock64, &xad, FALSE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 if (rc)
227 goto unlock;
228
229 set_buffer_new(bh_result);
230 map_bh(bh_result, ip->i_sb, addressXAD(&xad));
231 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
232
233#else /* _JFS_4K */
234 /*
235 * We need to do whatever it takes to keep all but the last buffers
236 * in 4K pages - see jfs_write.c
237 */
238 BUG();
239#endif /* _JFS_4K */
240
241 unlock:
242 /*
243 * Release lock on inode
244 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600245 if (create)
246 IWRITE_UNLOCK(ip);
247 else
248 IREAD_UNLOCK(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 return rc;
250}
251
252static int jfs_get_block(struct inode *ip, sector_t lblock,
253 struct buffer_head *bh_result, int create)
254{
255 return jfs_get_blocks(ip, lblock, 1, bh_result, create);
256}
257
258static int jfs_writepage(struct page *page, struct writeback_control *wbc)
259{
260 return nobh_writepage(page, jfs_get_block, wbc);
261}
262
263static int jfs_writepages(struct address_space *mapping,
264 struct writeback_control *wbc)
265{
266 return mpage_writepages(mapping, wbc, jfs_get_block);
267}
268
269static int jfs_readpage(struct file *file, struct page *page)
270{
271 return mpage_readpage(page, jfs_get_block);
272}
273
274static int jfs_readpages(struct file *file, struct address_space *mapping,
275 struct list_head *pages, unsigned nr_pages)
276{
277 return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
278}
279
280static int jfs_prepare_write(struct file *file,
281 struct page *page, unsigned from, unsigned to)
282{
283 return nobh_prepare_write(page, from, to, jfs_get_block);
284}
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,
298 offset, nr_segs, jfs_get_blocks, NULL);
299}
300
301struct address_space_operations jfs_aops = {
302 .readpage = jfs_readpage,
303 .readpages = jfs_readpages,
304 .writepage = jfs_writepage,
305 .writepages = jfs_writepages,
306 .sync_page = block_sync_page,
307 .prepare_write = jfs_prepare_write,
308 .commit_write = nobh_commit_write,
309 .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 /*
333 * The commit_sem cannot be taken before txBegin.
334 * 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 */
338 down(&JFS_IP(ip)->commit_sem);
339
340 newsize = xtTruncate(tid, ip, length,
341 COMMIT_TRUNCATE | COMMIT_PWMAP);
342 if (newsize < 0) {
343 txEnd(tid);
344 up(&JFS_IP(ip)->commit_sem);
345 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);
353 up(&JFS_IP(ip)->commit_sem);
354 } 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
361 nobh_truncate_page(ip->i_mapping, ip->i_size);
362
363 IWRITE_LOCK(ip);
364 jfs_truncate_nolock(ip, ip->i_size);
365 IWRITE_UNLOCK(ip);
366}