2 * Copyright (C) International Business Machines Corp., 2000-2004
3 * Portions Copyright (C) Christoph Hellwig, 2001-2002
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.
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.
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
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_inode.h"
27 #include "jfs_filsys.h"
29 #include "jfs_extent.h"
30 #include "jfs_unicode.h"
31 #include "jfs_debug.h"
34 void jfs_read_inode(struct inode
*inode
)
37 make_bad_inode(inode
);
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
;
53 inode
->i_op
= &jfs_symlink_inode_operations
;
55 inode
->i_op
= &jfs_file_inode_operations
;
56 init_special_inode(inode
, inode
->i_mode
, inode
->i_rdev
);
61 * Workhorse of both fsync & write_inode
63 int jfs_commit_inode(struct inode
*inode
, int wait
)
69 jfs_info("In jfs_commit_inode, inode = 0x%p", inode
);
72 * Don't commit if inode has been committed since last being
73 * marked dirty, or if it has been deleted.
75 if (inode
->i_nlink
== 0 || !test_cflag(COMMIT_Dirty
, inode
))
78 if (isReadOnly(inode
)) {
79 /* kernel allows writes to devices on read-only
80 * partitions and may think inode is dirty
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?");
91 tid
= txBegin(inode
->i_sb
, COMMIT_INODE
);
92 mutex_lock(&JFS_IP(inode
)->commit_mutex
);
95 * Retest inode state after taking commit_mutex
97 if (inode
->i_nlink
&& test_cflag(COMMIT_Dirty
, inode
))
98 rc
= txCommit(tid
, 1, &inode
, wait
? COMMIT_SYNC
: 0);
101 mutex_unlock(&JFS_IP(inode
)->commit_mutex
);
105 int jfs_write_inode(struct inode
*inode
, int wait
)
107 if (test_cflag(COMMIT_Nolink
, inode
))
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.
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
);
120 if (jfs_commit_inode(inode
, wait
)) {
121 jfs_err("jfs_write_inode: jfs_commit_inode failed!");
127 void jfs_delete_inode(struct inode
*inode
)
129 jfs_info("In jfs_delete_inode, inode = 0x%p", inode
);
131 if (!is_bad_inode(inode
) &&
132 (JFS_IP(inode
)->fileset
== FILESYSTEM_I
)) {
133 truncate_inode_pages(&inode
->i_data
, 0);
135 if (test_cflag(COMMIT_Freewmap
, inode
))
136 jfs_free_zero_link(inode
);
141 * Free the inode from the quota allocation.
144 DQUOT_FREE_INODE(inode
);
151 void jfs_dirty_inode(struct inode
*inode
)
153 static int noisy
= 5;
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
160 jfs_err("jfs_dirty_inode called on read-only volume");
161 jfs_err("Is remount racy?");
167 set_cflag(COMMIT_Dirty
, inode
);
171 jfs_get_blocks(struct inode
*ip
, sector_t lblock
, unsigned long max_blocks
,
172 struct buffer_head
*bh_result
, int create
)
174 s64 lblock64
= lblock
;
179 s32 xlen
= max_blocks
;
182 * Take appropriate lock on inode
189 if (((lblock64
<< ip
->i_sb
->s_blocksize_bits
) < ip
->i_size
) &&
190 (!xtLookup(ip
, lblock64
, max_blocks
, &xflag
, &xaddr
, &xlen
, 0)) &&
192 if (xflag
& XAD_NOTRECORDED
) {
195 * Allocated but not recorded, read treats
200 XADoffset(&xad
, lblock64
);
201 XADlength(&xad
, xlen
);
202 XADaddress(&xad
, xaddr
);
205 * As long as block size = 4K, this isn't a problem.
206 * We should mark the whole page not ABNR, but how
207 * will we know to mark the other blocks BH_New?
211 rc
= extRecord(ip
, &xad
);
214 set_buffer_new(bh_result
);
217 map_bh(bh_result
, ip
->i_sb
, xaddr
);
218 bh_result
->b_size
= xlen
<< ip
->i_blkbits
;
225 * Allocate a new block
228 if ((rc
= extHint(ip
, lblock64
<< ip
->i_sb
->s_blocksize_bits
, &xad
)))
230 rc
= extAlloc(ip
, xlen
, lblock64
, &xad
, FALSE
);
234 set_buffer_new(bh_result
);
235 map_bh(bh_result
, ip
->i_sb
, addressXAD(&xad
));
236 bh_result
->b_size
= lengthXAD(&xad
) << ip
->i_blkbits
;
240 * We need to do whatever it takes to keep all but the last buffers
241 * in 4K pages - see jfs_write.c
248 * Release lock on inode
257 static int jfs_get_block(struct inode
*ip
, sector_t lblock
,
258 struct buffer_head
*bh_result
, int create
)
260 return jfs_get_blocks(ip
, lblock
, 1, bh_result
, create
);
263 static int jfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
265 return nobh_writepage(page
, jfs_get_block
, wbc
);
268 static int jfs_writepages(struct address_space
*mapping
,
269 struct writeback_control
*wbc
)
271 return mpage_writepages(mapping
, wbc
, jfs_get_block
);
274 static int jfs_readpage(struct file
*file
, struct page
*page
)
276 return mpage_readpage(page
, jfs_get_block
);
279 static int jfs_readpages(struct file
*file
, struct address_space
*mapping
,
280 struct list_head
*pages
, unsigned nr_pages
)
282 return mpage_readpages(mapping
, pages
, nr_pages
, jfs_get_block
);
285 static int jfs_prepare_write(struct file
*file
,
286 struct page
*page
, unsigned from
, unsigned to
)
288 return nobh_prepare_write(page
, from
, to
, jfs_get_block
);
291 static sector_t
jfs_bmap(struct address_space
*mapping
, sector_t block
)
293 return generic_block_bmap(mapping
, block
, jfs_get_block
);
296 static ssize_t
jfs_direct_IO(int rw
, struct kiocb
*iocb
,
297 const struct iovec
*iov
, loff_t offset
, unsigned long nr_segs
)
299 struct file
*file
= iocb
->ki_filp
;
300 struct inode
*inode
= file
->f_mapping
->host
;
302 return blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iov
,
303 offset
, nr_segs
, jfs_get_blocks
, NULL
);
306 struct address_space_operations jfs_aops
= {
307 .readpage
= jfs_readpage
,
308 .readpages
= jfs_readpages
,
309 .writepage
= jfs_writepage
,
310 .writepages
= jfs_writepages
,
311 .sync_page
= block_sync_page
,
312 .prepare_write
= jfs_prepare_write
,
313 .commit_write
= nobh_commit_write
,
315 .direct_IO
= jfs_direct_IO
,
319 * Guts of jfs_truncate. Called with locks already held. Can be called
320 * with directory for truncating directory index table.
322 void jfs_truncate_nolock(struct inode
*ip
, loff_t length
)
329 if (test_cflag(COMMIT_Nolink
, ip
)) {
330 xtTruncate(0, ip
, length
, COMMIT_WMAP
);
335 tid
= txBegin(ip
->i_sb
, 0);
338 * The commit_mutex cannot be taken before txBegin.
339 * txBegin may block and there is a chance the inode
340 * could be marked dirty and need to be committed
341 * before txBegin unblocks
343 mutex_lock(&JFS_IP(ip
)->commit_mutex
);
345 newsize
= xtTruncate(tid
, ip
, length
,
346 COMMIT_TRUNCATE
| COMMIT_PWMAP
);
349 mutex_unlock(&JFS_IP(ip
)->commit_mutex
);
353 ip
->i_mtime
= ip
->i_ctime
= CURRENT_TIME
;
354 mark_inode_dirty(ip
);
356 txCommit(tid
, 1, &ip
, 0);
358 mutex_unlock(&JFS_IP(ip
)->commit_mutex
);
359 } while (newsize
> length
); /* Truncate isn't always atomic */
362 void jfs_truncate(struct inode
*ip
)
364 jfs_info("jfs_truncate: size = 0x%lx", (ulong
) ip
->i_size
);
366 nobh_truncate_page(ip
->i_mapping
, ip
->i_size
);
369 jfs_truncate_nolock(ip
, ip
->i_size
);