blob: 6c04f5eda135c7c1ca4bf56df116dcfa31cf42ad [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"
26#include "jfs_filsys.h"
27#include "jfs_imap.h"
28#include "jfs_extent.h"
29#include "jfs_unicode.h"
30#include "jfs_debug.h"
31
32
33extern struct inode_operations jfs_dir_inode_operations;
34extern struct inode_operations jfs_file_inode_operations;
35extern struct inode_operations jfs_symlink_inode_operations;
36extern struct file_operations jfs_dir_operations;
37extern struct file_operations jfs_file_operations;
38struct address_space_operations jfs_aops;
39extern int freeZeroLink(struct inode *);
40
41void jfs_read_inode(struct inode *inode)
42{
43 if (diRead(inode)) {
44 make_bad_inode(inode);
45 return;
46 }
47
48 if (S_ISREG(inode->i_mode)) {
49 inode->i_op = &jfs_file_inode_operations;
50 inode->i_fop = &jfs_file_operations;
51 inode->i_mapping->a_ops = &jfs_aops;
52 } else if (S_ISDIR(inode->i_mode)) {
53 inode->i_op = &jfs_dir_inode_operations;
54 inode->i_fop = &jfs_dir_operations;
55 } else if (S_ISLNK(inode->i_mode)) {
56 if (inode->i_size >= IDATASIZE) {
57 inode->i_op = &page_symlink_inode_operations;
58 inode->i_mapping->a_ops = &jfs_aops;
59 } else
60 inode->i_op = &jfs_symlink_inode_operations;
61 } else {
62 inode->i_op = &jfs_file_inode_operations;
63 init_special_inode(inode, inode->i_mode, inode->i_rdev);
64 }
65}
66
67/*
68 * Workhorse of both fsync & write_inode
69 */
70int jfs_commit_inode(struct inode *inode, int wait)
71{
72 int rc = 0;
73 tid_t tid;
74 static int noisy = 5;
75
76 jfs_info("In jfs_commit_inode, inode = 0x%p", inode);
77
78 /*
79 * Don't commit if inode has been committed since last being
80 * marked dirty, or if it has been deleted.
81 */
82 if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode))
83 return 0;
84
85 if (isReadOnly(inode)) {
86 /* kernel allows writes to devices on read-only
87 * partitions and may think inode is dirty
88 */
89 if (!special_file(inode->i_mode) && noisy) {
90 jfs_err("jfs_commit_inode(0x%p) called on "
91 "read-only volume", inode);
92 jfs_err("Is remount racy?");
93 noisy--;
94 }
95 return 0;
96 }
97
98 tid = txBegin(inode->i_sb, COMMIT_INODE);
99 down(&JFS_IP(inode)->commit_sem);
100
101 /*
102 * Retest inode state after taking commit_sem
103 */
104 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
105 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
106
107 txEnd(tid);
108 up(&JFS_IP(inode)->commit_sem);
109 return rc;
110}
111
112int jfs_write_inode(struct inode *inode, int wait)
113{
114 if (test_cflag(COMMIT_Nolink, inode))
115 return 0;
116 /*
117 * If COMMIT_DIRTY is not set, the inode isn't really dirty.
118 * It has been committed since the last change, but was still
119 * on the dirty inode list.
120 */
121 if (!test_cflag(COMMIT_Dirty, inode)) {
122 /* Make sure committed changes hit the disk */
123 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
124 return 0;
125 }
126
127 if (jfs_commit_inode(inode, wait)) {
128 jfs_err("jfs_write_inode: jfs_commit_inode failed!");
129 return -EIO;
130 } else
131 return 0;
132}
133
134void jfs_delete_inode(struct inode *inode)
135{
136 jfs_info("In jfs_delete_inode, inode = 0x%p", inode);
137
138 if (test_cflag(COMMIT_Freewmap, inode))
139 freeZeroLink(inode);
140
141 diFree(inode);
142
143 /*
144 * Free the inode from the quota allocation.
145 */
146 DQUOT_INIT(inode);
147 DQUOT_FREE_INODE(inode);
148 DQUOT_DROP(inode);
149
150 clear_inode(inode);
151}
152
153void jfs_dirty_inode(struct inode *inode)
154{
155 static int noisy = 5;
156
157 if (isReadOnly(inode)) {
158 if (!special_file(inode->i_mode) && noisy) {
159 /* kernel allows writes to devices on read-only
160 * partitions and may try to mark inode dirty
161 */
162 jfs_err("jfs_dirty_inode called on read-only volume");
163 jfs_err("Is remount racy?");
164 noisy--;
165 }
166 return;
167 }
168
169 set_cflag(COMMIT_Dirty, inode);
170}
171
172static int
173jfs_get_blocks(struct inode *ip, sector_t lblock, unsigned long max_blocks,
174 struct buffer_head *bh_result, int create)
175{
176 s64 lblock64 = lblock;
177 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 xad_t xad;
179 s64 xaddr;
180 int xflag;
181 s32 xlen;
182
183 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 * Take appropriate lock on inode
185 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600186 if (create)
187 IWRITE_LOCK(ip);
188 else
189 IREAD_LOCK(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
191 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600192 (!xtLookup(ip, lblock64, max_blocks, &xflag, &xaddr, &xlen, 0)) &&
193 xlen) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 if (xflag & XAD_NOTRECORDED) {
195 if (!create)
196 /*
197 * Allocated but not recorded, read treats
198 * this as a hole
199 */
200 goto unlock;
201#ifdef _JFS_4K
202 XADoffset(&xad, lblock64);
203 XADlength(&xad, xlen);
204 XADaddress(&xad, xaddr);
205#else /* _JFS_4K */
206 /*
207 * As long as block size = 4K, this isn't a problem.
208 * We should mark the whole page not ABNR, but how
209 * will we know to mark the other blocks BH_New?
210 */
211 BUG();
212#endif /* _JFS_4K */
213 rc = extRecord(ip, &xad);
214 if (rc)
215 goto unlock;
216 set_buffer_new(bh_result);
217 }
218
219 map_bh(bh_result, ip->i_sb, xaddr);
220 bh_result->b_size = xlen << ip->i_blkbits;
221 goto unlock;
222 }
223 if (!create)
224 goto unlock;
225
226 /*
227 * Allocate a new block
228 */
229#ifdef _JFS_4K
230 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
231 goto unlock;
232 rc = extAlloc(ip, max_blocks, lblock64, &xad, FALSE);
233 if (rc)
234 goto unlock;
235
236 set_buffer_new(bh_result);
237 map_bh(bh_result, ip->i_sb, addressXAD(&xad));
238 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
239
240#else /* _JFS_4K */
241 /*
242 * We need to do whatever it takes to keep all but the last buffers
243 * in 4K pages - see jfs_write.c
244 */
245 BUG();
246#endif /* _JFS_4K */
247
248 unlock:
249 /*
250 * Release lock on inode
251 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600252 if (create)
253 IWRITE_UNLOCK(ip);
254 else
255 IREAD_UNLOCK(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 return rc;
257}
258
259static int jfs_get_block(struct inode *ip, sector_t lblock,
260 struct buffer_head *bh_result, int create)
261{
262 return jfs_get_blocks(ip, lblock, 1, bh_result, create);
263}
264
265static int jfs_writepage(struct page *page, struct writeback_control *wbc)
266{
267 return nobh_writepage(page, jfs_get_block, wbc);
268}
269
270static int jfs_writepages(struct address_space *mapping,
271 struct writeback_control *wbc)
272{
273 return mpage_writepages(mapping, wbc, jfs_get_block);
274}
275
276static int jfs_readpage(struct file *file, struct page *page)
277{
278 return mpage_readpage(page, jfs_get_block);
279}
280
281static int jfs_readpages(struct file *file, struct address_space *mapping,
282 struct list_head *pages, unsigned nr_pages)
283{
284 return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
285}
286
287static int jfs_prepare_write(struct file *file,
288 struct page *page, unsigned from, unsigned to)
289{
290 return nobh_prepare_write(page, from, to, jfs_get_block);
291}
292
293static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
294{
295 return generic_block_bmap(mapping, block, jfs_get_block);
296}
297
298static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb,
299 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
300{
301 struct file *file = iocb->ki_filp;
302 struct inode *inode = file->f_mapping->host;
303
304 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
305 offset, nr_segs, jfs_get_blocks, NULL);
306}
307
308struct address_space_operations jfs_aops = {
309 .readpage = jfs_readpage,
310 .readpages = jfs_readpages,
311 .writepage = jfs_writepage,
312 .writepages = jfs_writepages,
313 .sync_page = block_sync_page,
314 .prepare_write = jfs_prepare_write,
315 .commit_write = nobh_commit_write,
316 .bmap = jfs_bmap,
317 .direct_IO = jfs_direct_IO,
318};
319
320/*
321 * Guts of jfs_truncate. Called with locks already held. Can be called
322 * with directory for truncating directory index table.
323 */
324void jfs_truncate_nolock(struct inode *ip, loff_t length)
325{
326 loff_t newsize;
327 tid_t tid;
328
329 ASSERT(length >= 0);
330
331 if (test_cflag(COMMIT_Nolink, ip)) {
332 xtTruncate(0, ip, length, COMMIT_WMAP);
333 return;
334 }
335
336 do {
337 tid = txBegin(ip->i_sb, 0);
338
339 /*
340 * The commit_sem cannot be taken before txBegin.
341 * txBegin may block and there is a chance the inode
342 * could be marked dirty and need to be committed
343 * before txBegin unblocks
344 */
345 down(&JFS_IP(ip)->commit_sem);
346
347 newsize = xtTruncate(tid, ip, length,
348 COMMIT_TRUNCATE | COMMIT_PWMAP);
349 if (newsize < 0) {
350 txEnd(tid);
351 up(&JFS_IP(ip)->commit_sem);
352 break;
353 }
354
355 ip->i_mtime = ip->i_ctime = CURRENT_TIME;
356 mark_inode_dirty(ip);
357
358 txCommit(tid, 1, &ip, 0);
359 txEnd(tid);
360 up(&JFS_IP(ip)->commit_sem);
361 } while (newsize > length); /* Truncate isn't always atomic */
362}
363
364void jfs_truncate(struct inode *ip)
365{
366 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
367
368 nobh_truncate_page(ip->i_mapping, ip->i_size);
369
370 IWRITE_LOCK(ip);
371 jfs_truncate_nolock(ip, ip->i_size);
372 IWRITE_UNLOCK(ip);
373}