aboutsummaryrefslogtreecommitdiffstats
path: root/fs/jfs/inode.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/jfs/inode.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/jfs/inode.c')
-rw-r--r--fs/jfs/inode.c384
1 files changed, 384 insertions, 0 deletions
diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
new file mode 100644
index 000000000000..7bc906677b0d
--- /dev/null
+++ b/fs/jfs/inode.c
@@ -0,0 +1,384 @@
1/*
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;
178 int take_locks;
179 xad_t xad;
180 s64 xaddr;
181 int xflag;
182 s32 xlen;
183
184 /*
185 * If this is a special inode (imap, dmap)
186 * the lock should already be taken
187 */
188 take_locks = (JFS_IP(ip)->fileset != AGGREGATE_I);
189
190 /*
191 * Take appropriate lock on inode
192 */
193 if (take_locks) {
194 if (create)
195 IWRITE_LOCK(ip);
196 else
197 IREAD_LOCK(ip);
198 }
199
200 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
201 (xtLookup(ip, lblock64, max_blocks, &xflag, &xaddr, &xlen, 0)
202 == 0) && xlen) {
203 if (xflag & XAD_NOTRECORDED) {
204 if (!create)
205 /*
206 * Allocated but not recorded, read treats
207 * this as a hole
208 */
209 goto unlock;
210#ifdef _JFS_4K
211 XADoffset(&xad, lblock64);
212 XADlength(&xad, xlen);
213 XADaddress(&xad, xaddr);
214#else /* _JFS_4K */
215 /*
216 * As long as block size = 4K, this isn't a problem.
217 * We should mark the whole page not ABNR, but how
218 * will we know to mark the other blocks BH_New?
219 */
220 BUG();
221#endif /* _JFS_4K */
222 rc = extRecord(ip, &xad);
223 if (rc)
224 goto unlock;
225 set_buffer_new(bh_result);
226 }
227
228 map_bh(bh_result, ip->i_sb, xaddr);
229 bh_result->b_size = xlen << ip->i_blkbits;
230 goto unlock;
231 }
232 if (!create)
233 goto unlock;
234
235 /*
236 * Allocate a new block
237 */
238#ifdef _JFS_4K
239 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
240 goto unlock;
241 rc = extAlloc(ip, max_blocks, lblock64, &xad, FALSE);
242 if (rc)
243 goto unlock;
244
245 set_buffer_new(bh_result);
246 map_bh(bh_result, ip->i_sb, addressXAD(&xad));
247 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
248
249#else /* _JFS_4K */
250 /*
251 * We need to do whatever it takes to keep all but the last buffers
252 * in 4K pages - see jfs_write.c
253 */
254 BUG();
255#endif /* _JFS_4K */
256
257 unlock:
258 /*
259 * Release lock on inode
260 */
261 if (take_locks) {
262 if (create)
263 IWRITE_UNLOCK(ip);
264 else
265 IREAD_UNLOCK(ip);
266 }
267 return rc;
268}
269
270static int jfs_get_block(struct inode *ip, sector_t lblock,
271 struct buffer_head *bh_result, int create)
272{
273 return jfs_get_blocks(ip, lblock, 1, bh_result, create);
274}
275
276static int jfs_writepage(struct page *page, struct writeback_control *wbc)
277{
278 return nobh_writepage(page, jfs_get_block, wbc);
279}
280
281static int jfs_writepages(struct address_space *mapping,
282 struct writeback_control *wbc)
283{
284 return mpage_writepages(mapping, wbc, jfs_get_block);
285}
286
287static int jfs_readpage(struct file *file, struct page *page)
288{
289 return mpage_readpage(page, jfs_get_block);
290}
291
292static int jfs_readpages(struct file *file, struct address_space *mapping,
293 struct list_head *pages, unsigned nr_pages)
294{
295 return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
296}
297
298static int jfs_prepare_write(struct file *file,
299 struct page *page, unsigned from, unsigned to)
300{
301 return nobh_prepare_write(page, from, to, jfs_get_block);
302}
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,
316 offset, nr_segs, jfs_get_blocks, NULL);
317}
318
319struct address_space_operations jfs_aops = {
320 .readpage = jfs_readpage,
321 .readpages = jfs_readpages,
322 .writepage = jfs_writepage,
323 .writepages = jfs_writepages,
324 .sync_page = block_sync_page,
325 .prepare_write = jfs_prepare_write,
326 .commit_write = nobh_commit_write,
327 .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 /*
351 * The commit_sem cannot be taken before txBegin.
352 * 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 */
356 down(&JFS_IP(ip)->commit_sem);
357
358 newsize = xtTruncate(tid, ip, length,
359 COMMIT_TRUNCATE | COMMIT_PWMAP);
360 if (newsize < 0) {
361 txEnd(tid);
362 up(&JFS_IP(ip)->commit_sem);
363 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);
371 up(&JFS_IP(ip)->commit_sem);
372 } 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
379 nobh_truncate_page(ip->i_mapping, ip->i_size);
380
381 IWRITE_LOCK(ip);
382 jfs_truncate_nolock(ip, ip->i_size);
383 IWRITE_UNLOCK(ip);
384}