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 down(&JFS_IP(inode)->commit_sem);
95 * Retest inode state after taking commit_sem
97 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
98 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
101 up(&JFS_IP(inode)->commit_sem);
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 != cpu_to_le32(FILESYSTEM_I)))
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);
150 void jfs_dirty_inode(struct inode *inode)
152 static int noisy = 5;
154 if (isReadOnly(inode)) {
155 if (!special_file(inode->i_mode) && noisy) {
156 /* kernel allows writes to devices on read-only
157 * partitions and may try to mark inode dirty
159 jfs_err("jfs_dirty_inode called on read-only volume");
160 jfs_err("Is remount racy?");
166 set_cflag(COMMIT_Dirty, inode);
170 jfs_get_blocks(struct inode *ip, sector_t lblock, unsigned long max_blocks,
171 struct buffer_head *bh_result, int create)
173 s64 lblock64 = lblock;
178 s32 xlen = max_blocks;
181 * Take appropriate lock on inode
188 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
189 (!xtLookup(ip, lblock64, max_blocks, &xflag, &xaddr, &xlen, 0)) &&
191 if (xflag & XAD_NOTRECORDED) {
194 * Allocated but not recorded, read treats
199 XADoffset(&xad, lblock64);
200 XADlength(&xad, xlen);
201 XADaddress(&xad, xaddr);
204 * As long as block size = 4K, this isn't a problem.
205 * We should mark the whole page not ABNR, but how
206 * will we know to mark the other blocks BH_New?
210 rc = extRecord(ip, &xad);
213 set_buffer_new(bh_result);
216 map_bh(bh_result, ip->i_sb, xaddr);
217 bh_result->b_size = xlen << ip->i_blkbits;
224 * Allocate a new block
227 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
229 rc = extAlloc(ip, xlen, lblock64, &xad, FALSE);
233 set_buffer_new(bh_result);
234 map_bh(bh_result, ip->i_sb, addressXAD(&xad));
235 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
239 * We need to do whatever it takes to keep all but the last buffers
240 * in 4K pages - see jfs_write.c
247 * Release lock on inode
256 static int jfs_get_block(struct inode *ip, sector_t lblock,
257 struct buffer_head *bh_result, int create)
259 return jfs_get_blocks(ip, lblock, 1, bh_result, create);
262 static int jfs_writepage(struct page *page, struct writeback_control *wbc)
264 return nobh_writepage(page, jfs_get_block, wbc);
267 static int jfs_writepages(struct address_space *mapping,
268 struct writeback_control *wbc)
270 return mpage_writepages(mapping, wbc, jfs_get_block);
273 static int jfs_readpage(struct file *file, struct page *page)
275 return mpage_readpage(page, jfs_get_block);
278 static int jfs_readpages(struct file *file, struct address_space *mapping,
279 struct list_head *pages, unsigned nr_pages)
281 return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
284 static int jfs_prepare_write(struct file *file,
285 struct page *page, unsigned from, unsigned to)
287 return nobh_prepare_write(page, from, to, jfs_get_block);
290 static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
292 return generic_block_bmap(mapping, block, jfs_get_block);
295 static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb,
296 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
298 struct file *file = iocb->ki_filp;
299 struct inode *inode = file->f_mapping->host;
301 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
302 offset, nr_segs, jfs_get_blocks, NULL);
305 struct address_space_operations jfs_aops = {
306 .readpage = jfs_readpage,
307 .readpages = jfs_readpages,
308 .writepage = jfs_writepage,
309 .writepages = jfs_writepages,
310 .sync_page = block_sync_page,
311 .prepare_write = jfs_prepare_write,
312 .commit_write = nobh_commit_write,
314 .direct_IO = jfs_direct_IO,
318 * Guts of jfs_truncate. Called with locks already held. Can be called
319 * with directory for truncating directory index table.
321 void jfs_truncate_nolock(struct inode *ip, loff_t length)
328 if (test_cflag(COMMIT_Nolink, ip)) {
329 xtTruncate(0, ip, length, COMMIT_WMAP);
334 tid = txBegin(ip->i_sb, 0);
337 * The commit_sem cannot be taken before txBegin.
338 * txBegin may block and there is a chance the inode
339 * could be marked dirty and need to be committed
340 * before txBegin unblocks
342 down(&JFS_IP(ip)->commit_sem);
344 newsize = xtTruncate(tid, ip, length,
345 COMMIT_TRUNCATE | COMMIT_PWMAP);
348 up(&JFS_IP(ip)->commit_sem);
352 ip->i_mtime = ip->i_ctime = CURRENT_TIME;
353 mark_inode_dirty(ip);
355 txCommit(tid, 1, &ip, 0);
357 up(&JFS_IP(ip)->commit_sem);
358 } while (newsize > length); /* Truncate isn't always atomic */
361 void jfs_truncate(struct inode *ip)
363 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
365 nobh_truncate_page(ip->i_mapping, ip->i_size);
368 jfs_truncate_nolock(ip, ip->i_size);