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_filsys.h"
28 #include "jfs_extent.h"
29 #include "jfs_unicode.h"
30 #include "jfs_debug.h"
33 extern struct inode_operations jfs_dir_inode_operations;
34 extern struct inode_operations jfs_file_inode_operations;
35 extern struct inode_operations jfs_symlink_inode_operations;
36 extern struct file_operations jfs_dir_operations;
37 extern struct file_operations jfs_file_operations;
38 struct address_space_operations jfs_aops;
39 extern int freeZeroLink(struct inode *);
41 void jfs_read_inode(struct inode *inode)
44 make_bad_inode(inode);
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 inode->i_mapping->a_ops = &jfs_aops;
56 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
57 } else if (S_ISLNK(inode->i_mode)) {
58 if (inode->i_size >= IDATASIZE) {
59 inode->i_op = &page_symlink_inode_operations;
60 inode->i_mapping->a_ops = &jfs_aops;
62 inode->i_op = &jfs_symlink_inode_operations;
64 inode->i_op = &jfs_file_inode_operations;
65 init_special_inode(inode, inode->i_mode, inode->i_rdev);
70 * Workhorse of both fsync & write_inode
72 int jfs_commit_inode(struct inode *inode, int wait)
78 jfs_info("In jfs_commit_inode, inode = 0x%p", inode);
81 * Don't commit if inode has been committed since last being
82 * marked dirty, or if it has been deleted.
84 if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode))
87 if (isReadOnly(inode)) {
88 /* kernel allows writes to devices on read-only
89 * partitions and may think inode is dirty
91 if (!special_file(inode->i_mode) && noisy) {
92 jfs_err("jfs_commit_inode(0x%p) called on "
93 "read-only volume", inode);
94 jfs_err("Is remount racy?");
100 tid = txBegin(inode->i_sb, COMMIT_INODE);
101 down(&JFS_IP(inode)->commit_sem);
104 * Retest inode state after taking commit_sem
106 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
107 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
110 up(&JFS_IP(inode)->commit_sem);
114 int jfs_write_inode(struct inode *inode, int wait)
116 if (test_cflag(COMMIT_Nolink, inode))
119 * If COMMIT_DIRTY is not set, the inode isn't really dirty.
120 * It has been committed since the last change, but was still
121 * on the dirty inode list.
123 if (!test_cflag(COMMIT_Dirty, inode)) {
124 /* Make sure committed changes hit the disk */
125 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
129 if (jfs_commit_inode(inode, wait)) {
130 jfs_err("jfs_write_inode: jfs_commit_inode failed!");
136 void jfs_delete_inode(struct inode *inode)
138 jfs_info("In jfs_delete_inode, inode = 0x%p", inode);
140 if (test_cflag(COMMIT_Freewmap, inode))
146 * Free the inode from the quota allocation.
149 DQUOT_FREE_INODE(inode);
155 void jfs_dirty_inode(struct inode *inode)
157 static int noisy = 5;
159 if (isReadOnly(inode)) {
160 if (!special_file(inode->i_mode) && noisy) {
161 /* kernel allows writes to devices on read-only
162 * partitions and may try to mark inode dirty
164 jfs_err("jfs_dirty_inode called on read-only volume");
165 jfs_err("Is remount racy?");
171 set_cflag(COMMIT_Dirty, inode);
175 jfs_get_blocks(struct inode *ip, sector_t lblock, unsigned long max_blocks,
176 struct buffer_head *bh_result, int create)
178 s64 lblock64 = lblock;
179 int no_size_check = 0;
188 * If this is a special inode (imap, dmap) or directory,
189 * the lock should already be taken
191 take_locks = ((JFS_IP(ip)->fileset != AGGREGATE_I) &&
192 !S_ISDIR(ip->i_mode));
194 * Take appropriate lock on inode
204 * A directory's "data" is the inode index table, but i_size is the
205 * size of the d-tree, so don't check the offset against i_size
207 if (S_ISDIR(ip->i_mode))
210 if ((no_size_check ||
211 ((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size)) &&
212 (xtLookup(ip, lblock64, max_blocks, &xflag, &xaddr, &xlen, no_size_check)
214 if (xflag & XAD_NOTRECORDED) {
217 * Allocated but not recorded, read treats
222 XADoffset(&xad, lblock64);
223 XADlength(&xad, xlen);
224 XADaddress(&xad, xaddr);
227 * As long as block size = 4K, this isn't a problem.
228 * We should mark the whole page not ABNR, but how
229 * will we know to mark the other blocks BH_New?
233 rc = extRecord(ip, &xad);
236 set_buffer_new(bh_result);
239 map_bh(bh_result, ip->i_sb, xaddr);
240 bh_result->b_size = xlen << ip->i_blkbits;
247 * Allocate a new block
250 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
252 rc = extAlloc(ip, max_blocks, lblock64, &xad, FALSE);
256 set_buffer_new(bh_result);
257 map_bh(bh_result, ip->i_sb, addressXAD(&xad));
258 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
262 * We need to do whatever it takes to keep all but the last buffers
263 * in 4K pages - see jfs_write.c
270 * Release lock on inode
281 static int jfs_get_block(struct inode *ip, sector_t lblock,
282 struct buffer_head *bh_result, int create)
284 return jfs_get_blocks(ip, lblock, 1, bh_result, create);
287 static int jfs_writepage(struct page *page, struct writeback_control *wbc)
289 return block_write_full_page(page, jfs_get_block, wbc);
292 static int jfs_writepages(struct address_space *mapping,
293 struct writeback_control *wbc)
295 return mpage_writepages(mapping, wbc, jfs_get_block);
298 static int jfs_readpage(struct file *file, struct page *page)
300 return mpage_readpage(page, jfs_get_block);
303 static int jfs_readpages(struct file *file, struct address_space *mapping,
304 struct list_head *pages, unsigned nr_pages)
306 return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
309 static int jfs_prepare_write(struct file *file,
310 struct page *page, unsigned from, unsigned to)
312 return nobh_prepare_write(page, from, to, jfs_get_block);
315 static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
317 return generic_block_bmap(mapping, block, jfs_get_block);
320 static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb,
321 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
323 struct file *file = iocb->ki_filp;
324 struct inode *inode = file->f_mapping->host;
326 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
327 offset, nr_segs, jfs_get_blocks, NULL);
330 struct address_space_operations jfs_aops = {
331 .readpage = jfs_readpage,
332 .readpages = jfs_readpages,
333 .writepage = jfs_writepage,
334 .writepages = jfs_writepages,
335 .sync_page = block_sync_page,
336 .prepare_write = jfs_prepare_write,
337 .commit_write = nobh_commit_write,
339 .direct_IO = jfs_direct_IO,
343 * Guts of jfs_truncate. Called with locks already held. Can be called
344 * with directory for truncating directory index table.
346 void jfs_truncate_nolock(struct inode *ip, loff_t length)
353 if (test_cflag(COMMIT_Nolink, ip)) {
354 xtTruncate(0, ip, length, COMMIT_WMAP);
359 tid = txBegin(ip->i_sb, 0);
362 * The commit_sem cannot be taken before txBegin.
363 * txBegin may block and there is a chance the inode
364 * could be marked dirty and need to be committed
365 * before txBegin unblocks
367 down(&JFS_IP(ip)->commit_sem);
369 newsize = xtTruncate(tid, ip, length,
370 COMMIT_TRUNCATE | COMMIT_PWMAP);
373 up(&JFS_IP(ip)->commit_sem);
377 ip->i_mtime = ip->i_ctime = CURRENT_TIME;
378 mark_inode_dirty(ip);
380 txCommit(tid, 1, &ip, 0);
382 up(&JFS_IP(ip)->commit_sem);
383 } while (newsize > length); /* Truncate isn't always atomic */
386 void jfs_truncate(struct inode *ip)
388 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
390 nobh_truncate_page(ip->i_mapping, ip->i_size);
393 jfs_truncate_nolock(ip, ip->i_size);