[linux-block.git] / fs / jfs / inode.c

/*
 *   Copyright (C) International Business Machines Corp., 2000-2004
 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/fs.h>
#include <linux/mpage.h>
#include <linux/buffer_head.h>
#include <linux/pagemap.h>
#include <linux/quotaops.h>
#include "jfs_incore.h"
#include "jfs_inode.h"
#include "jfs_filsys.h"
#include "jfs_imap.h"
#include "jfs_extent.h"
#include "jfs_unicode.h"
#include "jfs_debug.h"


struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
{
	struct inode *inode;
	int ret;

	inode = iget_locked(sb, ino);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
		return inode;

	ret = diRead(inode);
	if (ret < 0) {
		iget_failed(inode);
		return ERR_PTR(ret);
	}

	if (S_ISREG(inode->i_mode)) {
		inode->i_op = &jfs_file_inode_operations;
		inode->i_fop = &jfs_file_operations;
		inode->i_mapping->a_ops = &jfs_aops;
	} else if (S_ISDIR(inode->i_mode)) {
		inode->i_op = &jfs_dir_inode_operations;
		inode->i_fop = &jfs_dir_operations;
	} else if (S_ISLNK(inode->i_mode)) {
		if (inode->i_size >= IDATASIZE) {
			inode->i_op = &page_symlink_inode_operations;
			inode->i_mapping->a_ops = &jfs_aops;
		} else {
			inode->i_op = &jfs_symlink_inode_operations;
			/*
			 * The inline data should be null-terminated, but
			 * don't let on-disk corruption crash the kernel
			 */
			JFS_IP(inode)->i_inline[inode->i_size] = '\0';
		}
	} else {
		inode->i_op = &jfs_file_inode_operations;
		init_special_inode(inode, inode->i_mode, inode->i_rdev);
	}
	unlock_new_inode(inode);
	return inode;
}

/*
 * Workhorse of both fsync & write_inode
 */
int jfs_commit_inode(struct inode *inode, int wait)
{
	int rc = 0;
	tid_t tid;
	static int noisy = 5;

	jfs_info("In jfs_commit_inode, inode = 0x%p", inode);

	/*
	 * Don't commit if inode has been committed since last being
	 * marked dirty, or if it has been deleted.
	 */
	if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode))
		return 0;

	if (isReadOnly(inode)) {
		/* kernel allows writes to devices on read-only
		 * partitions and may think inode is dirty
		 */
		if (!special_file(inode->i_mode) && noisy) {
			jfs_err("jfs_commit_inode(0x%p) called on "
				   "read-only volume", inode);
			jfs_err("Is remount racy?");
			noisy--;
		}
		return 0;
	}

	tid = txBegin(inode->i_sb, COMMIT_INODE);
	mutex_lock(&JFS_IP(inode)->commit_mutex);

	/*
	 * Retest inode state after taking commit_mutex
	 */
	if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
		rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);

	txEnd(tid);
	mutex_unlock(&JFS_IP(inode)->commit_mutex);
	return rc;
}

int jfs_write_inode(struct inode *inode, int wait)
{
	if (test_cflag(COMMIT_Nolink, inode))
		return 0;
	/*
	 * If COMMIT_DIRTY is not set, the inode isn't really dirty.
	 * It has been committed since the last change, but was still
	 * on the dirty inode list.
	 */
	 if (!test_cflag(COMMIT_Dirty, inode)) {
		/* Make sure committed changes hit the disk */
		jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
		return 0;
	 }

	if (jfs_commit_inode(inode, wait)) {
		jfs_err("jfs_write_inode: jfs_commit_inode failed!");
		return -EIO;
	} else
		return 0;
}

void jfs_delete_inode(struct inode *inode)
{
	jfs_info("In jfs_delete_inode, inode = 0x%p", inode);

	if (!is_bad_inode(inode) &&
	    (JFS_IP(inode)->fileset == FILESYSTEM_I)) {
		truncate_inode_pages(&inode->i_data, 0);

		if (test_cflag(COMMIT_Freewmap, inode))
			jfs_free_zero_link(inode);

		diFree(inode);

		/*
		 * Free the inode from the quota allocation.
		 */
		vfs_dq_init(inode);
		vfs_dq_free_inode(inode);
		vfs_dq_drop(inode);
	}

	clear_inode(inode);
}

void jfs_dirty_inode(struct inode *inode)
{
	static int noisy = 5;

	if (isReadOnly(inode)) {
		if (!special_file(inode->i_mode) && noisy) {
			/* kernel allows writes to devices on read-only
			 * partitions and may try to mark inode dirty
			 */
			jfs_err("jfs_dirty_inode called on read-only volume");
			jfs_err("Is remount racy?");
			noisy--;
		}
		return;
	}

	set_cflag(COMMIT_Dirty, inode);
}

int jfs_get_block(struct inode *ip, sector_t lblock,
		  struct buffer_head *bh_result, int create)
{
	s64 lblock64 = lblock;
	int rc = 0;
	xad_t xad;
	s64 xaddr;
	int xflag;
	s32 xlen = bh_result->b_size >> ip->i_blkbits;

	/*
	 * Take appropriate lock on inode
	 */
	if (create)
		IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
	else
		IREAD_LOCK(ip, RDWRLOCK_NORMAL);

	if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
	    (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
	    xaddr) {
		if (xflag & XAD_NOTRECORDED) {
			if (!create)
				/*
				 * Allocated but not recorded, read treats
				 * this as a hole
				 */
				goto unlock;
#ifdef _JFS_4K
			XADoffset(&xad, lblock64);
			XADlength(&xad, xlen);
			XADaddress(&xad, xaddr);
#else				/* _JFS_4K */
			/*
			 * As long as block size = 4K, this isn't a problem.
			 * We should mark the whole page not ABNR, but how
			 * will we know to mark the other blocks BH_New?
			 */
			BUG();
#endif				/* _JFS_4K */
			rc = extRecord(ip, &xad);
			if (rc)
				goto unlock;
			set_buffer_new(bh_result);
		}

		map_bh(bh_result, ip->i_sb, xaddr);
		bh_result->b_size = xlen << ip->i_blkbits;
		goto unlock;
	}
	if (!create)
		goto unlock;

	/*
	 * Allocate a new block
	 */
#ifdef _JFS_4K
	if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
		goto unlock;
	rc = extAlloc(ip, xlen, lblock64, &xad, false);
	if (rc)
		goto unlock;

	set_buffer_new(bh_result);
	map_bh(bh_result, ip->i_sb, addressXAD(&xad));
	bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;

#else				/* _JFS_4K */
	/*
	 * We need to do whatever it takes to keep all but the last buffers
	 * in 4K pages - see jfs_write.c
	 */
	BUG();
#endif				/* _JFS_4K */

      unlock:
	/*
	 * Release lock on inode
	 */
	if (create)
		IWRITE_UNLOCK(ip);
	else
		IREAD_UNLOCK(ip);
	return rc;
}

static int jfs_writepage(struct page *page, struct writeback_control *wbc)
{
	return block_write_full_page(page, jfs_get_block, wbc);
}

static int jfs_writepages(struct address_space *mapping,
			struct writeback_control *wbc)
{
	return mpage_writepages(mapping, wbc, jfs_get_block);
}

static int jfs_readpage(struct file *file, struct page *page)
{
	return mpage_readpage(page, jfs_get_block);
}

static int jfs_readpages(struct file *file, struct address_space *mapping,
		struct list_head *pages, unsigned nr_pages)
{
	return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
}

static int jfs_write_begin(struct file *file, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned flags,
				struct page **pagep, void **fsdata)
{
	return nobh_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
				jfs_get_block);
}

static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
{
	return generic_block_bmap(mapping, block, jfs_get_block);
}

static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb,
	const struct iovec *iov, loff_t offset, unsigned long nr_segs)
{
	struct file *file = iocb->ki_filp;
	struct inode *inode = file->f_mapping->host;

	return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
				offset, nr_segs, jfs_get_block, NULL);
}

const struct address_space_operations jfs_aops = {
	.readpage	= jfs_readpage,
	.readpages	= jfs_readpages,
	.writepage	= jfs_writepage,
	.writepages	= jfs_writepages,
	.sync_page	= block_sync_page,
	.write_begin	= jfs_write_begin,
	.write_end	= nobh_write_end,
	.bmap		= jfs_bmap,
	.direct_IO	= jfs_direct_IO,
};

/*
 * Guts of jfs_truncate.  Called with locks already held.  Can be called
 * with directory for truncating directory index table.
 */
void jfs_truncate_nolock(struct inode *ip, loff_t length)
{
	loff_t newsize;
	tid_t tid;

	ASSERT(length >= 0);

	if (test_cflag(COMMIT_Nolink, ip)) {
		xtTruncate(0, ip, length, COMMIT_WMAP);
		return;
	}

	do {
		tid = txBegin(ip->i_sb, 0);

		/*
		 * The commit_mutex cannot be taken before txBegin.
		 * txBegin may block and there is a chance the inode
		 * could be marked dirty and need to be committed
		 * before txBegin unblocks
		 */
		mutex_lock(&JFS_IP(ip)->commit_mutex);

		newsize = xtTruncate(tid, ip, length,
				     COMMIT_TRUNCATE | COMMIT_PWMAP);
		if (newsize < 0) {
			txEnd(tid);
			mutex_unlock(&JFS_IP(ip)->commit_mutex);
			break;
		}

		ip->i_mtime = ip->i_ctime = CURRENT_TIME;
		mark_inode_dirty(ip);

		txCommit(tid, 1, &ip, 0);
		txEnd(tid);
		mutex_unlock(&JFS_IP(ip)->commit_mutex);
	} while (newsize > length);	/* Truncate isn't always atomic */
}

void jfs_truncate(struct inode *ip)
{
	jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);

	nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);

	IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
	jfs_truncate_nolock(ip, ip->i_size);
	IWRITE_UNLOCK(ip);
}
Commit	Line	Data
1da177e4 LT	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
63f83c9f	7	* the Free Software Foundation; either version 2 of the License, or
1da177e4	8	* (at your option) any later version.
63f83c9f	9	*
1da177e4 LT	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
63f83c9f	16	* along with this program; if not, write to the Free Software
1da177e4 LT	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"
1868f4aa	26	#include "jfs_inode.h"
1da177e4 LT	27	#include "jfs_filsys.h"
	28	#include "jfs_imap.h"
	29	#include "jfs_extent.h"
	30	#include "jfs_unicode.h"
	31	#include "jfs_debug.h"
	32
	33
eab1df71	34	struct inode jfs_iget(struct super_block sb, unsigned long ino)
1da177e4	35	{
eab1df71 DH	36	struct inode *inode;
	37	int ret;
	38
	39	inode = iget_locked(sb, ino);
	40	if (!inode)
	41	return ERR_PTR(-ENOMEM);
	42	if (!(inode->i_state & I_NEW))
	43	return inode;
	44
	45	ret = diRead(inode);
	46	if (ret < 0) {
	47	iget_failed(inode);
	48	return ERR_PTR(ret);
1da177e4 LT	49	}
	50
	51	if (S_ISREG(inode->i_mode)) {
	52	inode->i_op = &jfs_file_inode_operations;
	53	inode->i_fop = &jfs_file_operations;
	54	inode->i_mapping->a_ops = &jfs_aops;
	55	} else if (S_ISDIR(inode->i_mode)) {
	56	inode->i_op = &jfs_dir_inode_operations;
	57	inode->i_fop = &jfs_dir_operations;
	58	} else if (S_ISLNK(inode->i_mode)) {
	59	if (inode->i_size >= IDATASIZE) {
	60	inode->i_op = &page_symlink_inode_operations;
	61	inode->i_mapping->a_ops = &jfs_aops;
d69e83d9	62	} else {
1da177e4	63	inode->i_op = &jfs_symlink_inode_operations;
d69e83d9 DK	64	/*
	65	* The inline data should be null-terminated, but
	66	* don't let on-disk corruption crash the kernel
	67	*/
	68	JFS_IP(inode)->i_inline[inode->i_size] = '\0';
	69	}
1da177e4 LT	70	} else {
	71	inode->i_op = &jfs_file_inode_operations;
	72	init_special_inode(inode, inode->i_mode, inode->i_rdev);
	73	}
eab1df71 DH	74	unlock_new_inode(inode);
eab1df71 DH	75	return inode;
1da177e4 LT	76	}
	77
	78	/*
	79	* Workhorse of both fsync & write_inode
	80	*/
	81	int jfs_commit_inode(struct inode *inode, int wait)
	82	{
	83	int rc = 0;
	84	tid_t tid;
	85	static int noisy = 5;
	86
	87	jfs_info("In jfs_commit_inode, inode = 0x%p", inode);
	88
	89	/*
	90	* Don't commit if inode has been committed since last being
	91	* marked dirty, or if it has been deleted.
	92	*/
	93	if (inode->i_nlink == 0 \|\| !test_cflag(COMMIT_Dirty, inode))
	94	return 0;
	95
	96	if (isReadOnly(inode)) {
	97	/* kernel allows writes to devices on read-only
	98	* partitions and may think inode is dirty
	99	*/
	100	if (!special_file(inode->i_mode) && noisy) {
	101	jfs_err("jfs_commit_inode(0x%p) called on "
	102	"read-only volume", inode);
	103	jfs_err("Is remount racy?");
	104	noisy--;
	105	}
	106	return 0;
	107	}
	108
	109	tid = txBegin(inode->i_sb, COMMIT_INODE);
1de87444	110	mutex_lock(&JFS_IP(inode)->commit_mutex);
1da177e4 LT	111
1da177e4 LT	112	/*
1de87444	113	* Retest inode state after taking commit_mutex
1da177e4 LT	114	*/
	115	if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
	116	rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
	117
	118	txEnd(tid);
1de87444	119	mutex_unlock(&JFS_IP(inode)->commit_mutex);
1da177e4 LT	120	return rc;
	121	}
	122
	123	int jfs_write_inode(struct inode *inode, int wait)
	124	{
	125	if (test_cflag(COMMIT_Nolink, inode))
	126	return 0;
	127	/*
	128	* If COMMIT_DIRTY is not set, the inode isn't really dirty.
	129	* It has been committed since the last change, but was still
	130	* on the dirty inode list.
	131	*/
	132	if (!test_cflag(COMMIT_Dirty, inode)) {
	133	/* Make sure committed changes hit the disk */
	134	jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
	135	return 0;
	136	}
	137
	138	if (jfs_commit_inode(inode, wait)) {
	139	jfs_err("jfs_write_inode: jfs_commit_inode failed!");
	140	return -EIO;
	141	} else
	142	return 0;
	143	}
	144
	145	void jfs_delete_inode(struct inode *inode)
	146	{
	147	jfs_info("In jfs_delete_inode, inode = 0x%p", inode);
	148
b1b5d7f9	149	if (!is_bad_inode(inode) &&
6cb1269b	150	(JFS_IP(inode)->fileset == FILESYSTEM_I)) {
32983696	151	truncate_inode_pages(&inode->i_data, 0);
fef26658	152
b1b5d7f9 DK	153	if (test_cflag(COMMIT_Freewmap, inode))
b1b5d7f9 DK	154	jfs_free_zero_link(inode);
1da177e4	155
b1b5d7f9	156	diFree(inode);
1da177e4	157
b1b5d7f9 DK	158	/*
	159	* Free the inode from the quota allocation.
	160	*/
c94d2a22 JK	161	vfs_dq_init(inode);
	162	vfs_dq_free_inode(inode);
	163	vfs_dq_drop(inode);
b1b5d7f9	164	}
1da177e4 LT	165
	166	clear_inode(inode);
	167	}
	168
	169	void jfs_dirty_inode(struct inode *inode)
	170	{
	171	static int noisy = 5;
	172
	173	if (isReadOnly(inode)) {
	174	if (!special_file(inode->i_mode) && noisy) {
	175	/* kernel allows writes to devices on read-only
	176	* partitions and may try to mark inode dirty
	177	*/
	178	jfs_err("jfs_dirty_inode called on read-only volume");
	179	jfs_err("Is remount racy?");
	180	noisy--;
	181	}
	182	return;
	183	}
	184
	185	set_cflag(COMMIT_Dirty, inode);
	186	}
	187
115ff50b DK	188	int jfs_get_block(struct inode *ip, sector_t lblock,
115ff50b DK	189	struct buffer_head *bh_result, int create)
1da177e4 LT	190	{
	191	s64 lblock64 = lblock;
	192	int rc = 0;
1da177e4 LT	193	xad_t xad;
	194	s64 xaddr;
	195	int xflag;
115ff50b	196	s32 xlen = bh_result->b_size >> ip->i_blkbits;
1da177e4	197
1da177e4 LT	198	/*
	199	* Take appropriate lock on inode
	200	*/
7fab479b	201	if (create)
82d5b9a7	202	IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
7fab479b	203	else
82d5b9a7	204	IREAD_LOCK(ip, RDWRLOCK_NORMAL);
1da177e4 LT	205
1da177e4 LT	206	if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
115ff50b	207	(!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
6628465e	208	xaddr) {
1da177e4 LT	209	if (xflag & XAD_NOTRECORDED) {
	210	if (!create)
	211	/*
	212	* Allocated but not recorded, read treats
	213	* this as a hole
	214	*/
	215	goto unlock;
	216	#ifdef _JFS_4K
	217	XADoffset(&xad, lblock64);
	218	XADlength(&xad, xlen);
	219	XADaddress(&xad, xaddr);
	220	#else /* _JFS_4K */
	221	/*
	222	* As long as block size = 4K, this isn't a problem.
	223	* We should mark the whole page not ABNR, but how
	224	* will we know to mark the other blocks BH_New?
	225	*/
	226	BUG();
	227	#endif /* _JFS_4K */
	228	rc = extRecord(ip, &xad);
	229	if (rc)
	230	goto unlock;
	231	set_buffer_new(bh_result);
	232	}
	233
	234	map_bh(bh_result, ip->i_sb, xaddr);
	235	bh_result->b_size = xlen << ip->i_blkbits;
	236	goto unlock;
	237	}
	238	if (!create)
	239	goto unlock;
	240
	241	/*
	242	* Allocate a new block
	243	*/
	244	#ifdef _JFS_4K
	245	if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
	246	goto unlock;
4d81715f	247	rc = extAlloc(ip, xlen, lblock64, &xad, false);
1da177e4 LT	248	if (rc)
	249	goto unlock;
	250
	251	set_buffer_new(bh_result);
	252	map_bh(bh_result, ip->i_sb, addressXAD(&xad));
	253	bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
	254
	255	#else /* _JFS_4K */
	256	/*
	257	* We need to do whatever it takes to keep all but the last buffers
	258	* in 4K pages - see jfs_write.c
	259	*/
	260	BUG();
	261	#endif /* _JFS_4K */
	262
	263	unlock:
	264	/*
	265	* Release lock on inode
	266	*/
7fab479b DK	267	if (create)
	268	IWRITE_UNLOCK(ip);
	269	else
	270	IREAD_UNLOCK(ip);
1da177e4 LT	271	return rc;
	272	}
	273
1da177e4 LT	274	static int jfs_writepage(struct page page, struct writeback_control wbc)
1da177e4 LT	275	{
d5c5f84b	276	return block_write_full_page(page, jfs_get_block, wbc);
1da177e4 LT	277	}
	278
	279	static int jfs_writepages(struct address_space *mapping,
	280	struct writeback_control *wbc)
	281	{
	282	return mpage_writepages(mapping, wbc, jfs_get_block);
	283	}
	284
	285	static int jfs_readpage(struct file file, struct page page)
	286	{
	287	return mpage_readpage(page, jfs_get_block);
	288	}
	289
	290	static int jfs_readpages(struct file file, struct address_space mapping,
	291	struct list_head *pages, unsigned nr_pages)
	292	{
	293	return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
	294	}
	295
d5c5f84b NP	296	static int jfs_write_begin(struct file file, struct address_space mapping,
	297	loff_t pos, unsigned len, unsigned flags,
	298	struct page pagep, void fsdata)
1da177e4	299	{
03158cd7	300	return nobh_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
d5c5f84b	301	jfs_get_block);
1da177e4 LT	302	}
	303
	304	static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
	305	{
	306	return generic_block_bmap(mapping, block, jfs_get_block);
	307	}
	308
	309	static 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,
1d8fa7a2	316	offset, nr_segs, jfs_get_block, NULL);
1da177e4 LT	317	}
1da177e4 LT	318
f5e54d6e	319	const struct address_space_operations jfs_aops = {
1da177e4 LT	320	.readpage = jfs_readpage,
	321	.readpages = jfs_readpages,
	322	.writepage = jfs_writepage,
	323	.writepages = jfs_writepages,
	324	.sync_page = block_sync_page,
d5c5f84b	325	.write_begin = jfs_write_begin,
03158cd7	326	.write_end = nobh_write_end,
1da177e4 LT	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	*/
	335	void 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	/*
1de87444	351	* The commit_mutex cannot be taken before txBegin.
1da177e4 LT	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	*/
1de87444	356	mutex_lock(&JFS_IP(ip)->commit_mutex);
1da177e4 LT	357
	358	newsize = xtTruncate(tid, ip, length,
	359	COMMIT_TRUNCATE \| COMMIT_PWMAP);
	360	if (newsize < 0) {
	361	txEnd(tid);
1de87444	362	mutex_unlock(&JFS_IP(ip)->commit_mutex);
1da177e4 LT	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);
1de87444	371	mutex_unlock(&JFS_IP(ip)->commit_mutex);
1da177e4 LT	372	} while (newsize > length); /* Truncate isn't always atomic */
	373	}
	374
	375	void jfs_truncate(struct inode *ip)
	376	{
	377	jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
	378
03158cd7	379	nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
1da177e4	380
82d5b9a7	381	IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
1da177e4 LT	382	jfs_truncate_nolock(ip, ip->i_size);
	383	IWRITE_UNLOCK(ip);
	384	}