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 <linux/uio.h>
26 #include <linux/writeback.h>
27 #include "jfs_incore.h"
28 #include "jfs_inode.h"
29 #include "jfs_filsys.h"
31 #include "jfs_extent.h"
32 #include "jfs_unicode.h"
33 #include "jfs_debug.h"
37 struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
42 inode = iget_locked(sb, ino);
44 return ERR_PTR(-ENOMEM);
45 if (!(inode->i_state & I_NEW))
54 if (S_ISREG(inode->i_mode)) {
55 inode->i_op = &jfs_file_inode_operations;
56 inode->i_fop = &jfs_file_operations;
57 inode->i_mapping->a_ops = &jfs_aops;
58 } else if (S_ISDIR(inode->i_mode)) {
59 inode->i_op = &jfs_dir_inode_operations;
60 inode->i_fop = &jfs_dir_operations;
61 } else if (S_ISLNK(inode->i_mode)) {
62 if (inode->i_size >= IDATASIZE) {
63 inode->i_op = &page_symlink_inode_operations;
64 inode_nohighmem(inode);
65 inode->i_mapping->a_ops = &jfs_aops;
67 inode->i_op = &jfs_fast_symlink_inode_operations;
68 inode->i_link = JFS_IP(inode)->i_inline;
70 * The inline data should be null-terminated, but
71 * don't let on-disk corruption crash the kernel
73 inode->i_link[inode->i_size] = '\0';
76 inode->i_op = &jfs_file_inode_operations;
77 init_special_inode(inode, inode->i_mode, inode->i_rdev);
79 unlock_new_inode(inode);
84 * Workhorse of both fsync & write_inode
86 int jfs_commit_inode(struct inode *inode, int wait)
92 jfs_info("In jfs_commit_inode, inode = 0x%p", inode);
95 * Don't commit if inode has been committed since last being
96 * marked dirty, or if it has been deleted.
98 if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode))
101 if (isReadOnly(inode)) {
102 /* kernel allows writes to devices on read-only
103 * partitions and may think inode is dirty
105 if (!special_file(inode->i_mode) && noisy) {
106 jfs_err("jfs_commit_inode(0x%p) called on read-only volume",
108 jfs_err("Is remount racy?");
114 tid = txBegin(inode->i_sb, COMMIT_INODE);
115 mutex_lock(&JFS_IP(inode)->commit_mutex);
118 * Retest inode state after taking commit_mutex
120 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
121 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
124 mutex_unlock(&JFS_IP(inode)->commit_mutex);
128 int jfs_write_inode(struct inode *inode, struct writeback_control *wbc)
130 int wait = wbc->sync_mode == WB_SYNC_ALL;
132 if (inode->i_nlink == 0)
135 * If COMMIT_DIRTY is not set, the inode isn't really dirty.
136 * It has been committed since the last change, but was still
137 * on the dirty inode list.
139 if (!test_cflag(COMMIT_Dirty, inode)) {
140 /* Make sure committed changes hit the disk */
141 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
145 if (jfs_commit_inode(inode, wait)) {
146 jfs_err("jfs_write_inode: jfs_commit_inode failed!");
152 void jfs_evict_inode(struct inode *inode)
154 struct jfs_inode_info *ji = JFS_IP(inode);
156 jfs_info("In jfs_evict_inode, inode = 0x%p", inode);
158 if (!inode->i_nlink && !is_bad_inode(inode)) {
159 dquot_initialize(inode);
161 if (JFS_IP(inode)->fileset == FILESYSTEM_I) {
162 truncate_inode_pages_final(&inode->i_data);
164 if (test_cflag(COMMIT_Freewmap, inode))
165 jfs_free_zero_link(inode);
170 * Free the inode from the quota allocation.
172 dquot_free_inode(inode);
175 truncate_inode_pages_final(&inode->i_data);
180 BUG_ON(!list_empty(&ji->anon_inode_list));
182 spin_lock_irq(&ji->ag_lock);
183 if (ji->active_ag != -1) {
184 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
185 atomic_dec(&bmap->db_active[ji->active_ag]);
188 spin_unlock_irq(&ji->ag_lock);
191 void jfs_dirty_inode(struct inode *inode, int flags)
193 static int noisy = 5;
195 if (isReadOnly(inode)) {
196 if (!special_file(inode->i_mode) && noisy) {
197 /* kernel allows writes to devices on read-only
198 * partitions and may try to mark inode dirty
200 jfs_err("jfs_dirty_inode called on read-only volume");
201 jfs_err("Is remount racy?");
207 set_cflag(COMMIT_Dirty, inode);
210 int jfs_get_block(struct inode *ip, sector_t lblock,
211 struct buffer_head *bh_result, int create)
213 s64 lblock64 = lblock;
218 s32 xlen = bh_result->b_size >> ip->i_blkbits;
221 * Take appropriate lock on inode
224 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
226 IREAD_LOCK(ip, RDWRLOCK_NORMAL);
228 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
229 (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
231 if (xflag & XAD_NOTRECORDED) {
234 * Allocated but not recorded, read treats
239 XADoffset(&xad, lblock64);
240 XADlength(&xad, xlen);
241 XADaddress(&xad, xaddr);
244 * As long as block size = 4K, this isn't a problem.
245 * We should mark the whole page not ABNR, but how
246 * will we know to mark the other blocks BH_New?
250 rc = extRecord(ip, &xad);
253 set_buffer_new(bh_result);
256 map_bh(bh_result, ip->i_sb, xaddr);
257 bh_result->b_size = xlen << ip->i_blkbits;
264 * Allocate a new block
267 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
269 rc = extAlloc(ip, xlen, lblock64, &xad, false);
273 set_buffer_new(bh_result);
274 map_bh(bh_result, ip->i_sb, addressXAD(&xad));
275 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
279 * We need to do whatever it takes to keep all but the last buffers
280 * in 4K pages - see jfs_write.c
287 * Release lock on inode
296 static int jfs_writepage(struct page *page, struct writeback_control *wbc)
298 return block_write_full_page(page, jfs_get_block, wbc);
301 static int jfs_writepages(struct address_space *mapping,
302 struct writeback_control *wbc)
304 return mpage_writepages(mapping, wbc, jfs_get_block);
307 static int jfs_readpage(struct file *file, struct page *page)
309 return mpage_readpage(page, jfs_get_block);
312 static int jfs_readpages(struct file *file, struct address_space *mapping,
313 struct list_head *pages, unsigned nr_pages)
315 return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
318 static void jfs_write_failed(struct address_space *mapping, loff_t to)
320 struct inode *inode = mapping->host;
322 if (to > inode->i_size) {
323 truncate_pagecache(inode, inode->i_size);
328 static int jfs_write_begin(struct file *file, struct address_space *mapping,
329 loff_t pos, unsigned len, unsigned flags,
330 struct page **pagep, void **fsdata)
334 ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
337 jfs_write_failed(mapping, pos + len);
342 static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
344 return generic_block_bmap(mapping, block, jfs_get_block);
347 static ssize_t jfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
349 struct file *file = iocb->ki_filp;
350 struct address_space *mapping = file->f_mapping;
351 struct inode *inode = file->f_mapping->host;
352 size_t count = iov_iter_count(iter);
355 ret = blockdev_direct_IO(iocb, inode, iter, jfs_get_block);
358 * In case of error extending write may have instantiated a few
359 * blocks outside i_size. Trim these off again.
361 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
362 loff_t isize = i_size_read(inode);
363 loff_t end = iocb->ki_pos + count;
366 jfs_write_failed(mapping, end);
372 const struct address_space_operations jfs_aops = {
373 .readpage = jfs_readpage,
374 .readpages = jfs_readpages,
375 .writepage = jfs_writepage,
376 .writepages = jfs_writepages,
377 .write_begin = jfs_write_begin,
378 .write_end = nobh_write_end,
380 .direct_IO = jfs_direct_IO,
384 * Guts of jfs_truncate. Called with locks already held. Can be called
385 * with directory for truncating directory index table.
387 void jfs_truncate_nolock(struct inode *ip, loff_t length)
394 if (test_cflag(COMMIT_Nolink, ip)) {
395 xtTruncate(0, ip, length, COMMIT_WMAP);
400 tid = txBegin(ip->i_sb, 0);
403 * The commit_mutex cannot be taken before txBegin.
404 * txBegin may block and there is a chance the inode
405 * could be marked dirty and need to be committed
406 * before txBegin unblocks
408 mutex_lock(&JFS_IP(ip)->commit_mutex);
410 newsize = xtTruncate(tid, ip, length,
411 COMMIT_TRUNCATE | COMMIT_PWMAP);
414 mutex_unlock(&JFS_IP(ip)->commit_mutex);
418 ip->i_mtime = ip->i_ctime = current_time(ip);
419 mark_inode_dirty(ip);
421 txCommit(tid, 1, &ip, 0);
423 mutex_unlock(&JFS_IP(ip)->commit_mutex);
424 } while (newsize > length); /* Truncate isn't always atomic */
427 void jfs_truncate(struct inode *ip)
429 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
431 nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
433 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
434 jfs_truncate_nolock(ip, ip->i_size);