[GitHub/mt8127/android_kernel_alcatel_ttab.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"


void jfs_read_inode(struct inode *inode)
{
	if (diRead(inode)) { 
		make_bad_inode(inode);
		return;
	}

	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;
	} else {
		inode->i_op = &jfs_file_inode_operations;
		init_special_inode(inode, inode->i_mode, inode->i_rdev);
	}
}

/*
 * 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);
	down(&JFS_IP(inode)->commit_sem);

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

	txEnd(tid);
	up(&JFS_IP(inode)->commit_sem);
	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 != cpu_to_le32(FILESYSTEM_I)))
			return;

	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.
	 */
	DQUOT_INIT(inode);
	DQUOT_FREE_INODE(inode);
	DQUOT_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);
}

static int
jfs_get_blocks(struct inode *ip, sector_t lblock, unsigned long max_blocks,
			struct buffer_head *bh_result, int create)
{
	s64 lblock64 = lblock;
	int rc = 0;
	xad_t xad;
	s64 xaddr;
	int xflag;
	s32 xlen = max_blocks;

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

	if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
	    (!xtLookup(ip, lblock64, max_blocks, &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_get_block(struct inode *ip, sector_t lblock,
			 struct buffer_head *bh_result, int create)
{
	return jfs_get_blocks(ip, lblock, 1, bh_result, create);
}

static int jfs_writepage(struct page *page, struct writeback_control *wbc)
{
	return nobh_writepage(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_prepare_write(struct file *file,
			     struct page *page, unsigned from, unsigned to)
{
	return nobh_prepare_write(page, from, to, 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_blocks, NULL);
}

struct address_space_operations jfs_aops = {
	.readpage	= jfs_readpage,
	.readpages	= jfs_readpages,
	.writepage	= jfs_writepage,
	.writepages	= jfs_writepages,
	.sync_page	= block_sync_page,
	.prepare_write	= jfs_prepare_write,
	.commit_write	= nobh_commit_write,
	.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_sem 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
		 */
		down(&JFS_IP(ip)->commit_sem);

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

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

		txCommit(tid, 1, &ip, 0);
		txEnd(tid);
		up(&JFS_IP(ip)->commit_sem);
	} 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);

	IWRITE_LOCK(ip);
	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
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	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
	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
	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
1da177e4 LT	34	void jfs_read_inode(struct inode *inode)
	35	{
	36	if (diRead(inode)) {
	37	make_bad_inode(inode);
	38	return;
	39	}
	40
	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;
	52	} else
	53	inode->i_op = &jfs_symlink_inode_operations;
	54	} else {
	55	inode->i_op = &jfs_file_inode_operations;
	56	init_special_inode(inode, inode->i_mode, inode->i_rdev);
	57	}
	58	}
	59
	60	/*
	61	* Workhorse of both fsync & write_inode
	62	*/
	63	int jfs_commit_inode(struct inode *inode, int wait)
	64	{
	65	int rc = 0;
	66	tid_t tid;
	67	static int noisy = 5;
	68
	69	jfs_info("In jfs_commit_inode, inode = 0x%p", inode);
	70
	71	/*
	72	* Don't commit if inode has been committed since last being
	73	* marked dirty, or if it has been deleted.
	74	*/
	75	if (inode->i_nlink == 0 \|\| !test_cflag(COMMIT_Dirty, inode))
	76	return 0;
	77
	78	if (isReadOnly(inode)) {
	79	/* kernel allows writes to devices on read-only
	80	* partitions and may think inode is dirty
	81	*/
	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?");
	86	noisy--;
	87	}
	88	return 0;
	89	}
	90
	91	tid = txBegin(inode->i_sb, COMMIT_INODE);
	92	down(&JFS_IP(inode)->commit_sem);
	93
	94	/*
	95	* Retest inode state after taking commit_sem
	96	*/
	97	if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
98	rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
99
100	txEnd(tid);
101	up(&JFS_IP(inode)->commit_sem);
102	return rc;
103	}
104
105	int jfs_write_inode(struct inode *inode, int wait)
106	{
107	if (test_cflag(COMMIT_Nolink, inode))
108	return 0;
109	/*
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.
113	*/
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);
117	return 0;
118	}
119
120	if (jfs_commit_inode(inode, wait)) {
121	jfs_err("jfs_write_inode: jfs_commit_inode failed!");
122	return -EIO;
123	} else
124	return 0;
125	}
126
127	void jfs_delete_inode(struct inode *inode)
128	{
129	jfs_info("In jfs_delete_inode, inode = 0x%p", inode);
130
30db1ae8 DK	131	if (is_bad_inode(inode) \|\|
	132	(JFS_IP(inode)->fileset != cpu_to_le32(FILESYSTEM_I)))
	133	return;
	134
fef26658 MF	135	truncate_inode_pages(&inode->i_data, 0);
fef26658 MF	136
1da177e4	137	if (test_cflag(COMMIT_Freewmap, inode))
1868f4aa	138	jfs_free_zero_link(inode);
1da177e4 LT	139
	140	diFree(inode);
	141
	142	/*
	143	* Free the inode from the quota allocation.
	144	*/
	145	DQUOT_INIT(inode);
	146	DQUOT_FREE_INODE(inode);
	147	DQUOT_DROP(inode);
	148
	149	clear_inode(inode);
	150	}
	151
	152	void jfs_dirty_inode(struct inode *inode)
	153	{
	154	static int noisy = 5;
	155
	156	if (isReadOnly(inode)) {
	157	if (!special_file(inode->i_mode) && noisy) {
	158	/* kernel allows writes to devices on read-only
	159	* partitions and may try to mark inode dirty
	160	*/
	161	jfs_err("jfs_dirty_inode called on read-only volume");
	162	jfs_err("Is remount racy?");
	163	noisy--;
	164	}
	165	return;
	166	}
	167
	168	set_cflag(COMMIT_Dirty, inode);
	169	}
	170
	171	static int
	172	jfs_get_blocks(struct inode *ip, sector_t lblock, unsigned long max_blocks,
	173	struct buffer_head *bh_result, int create)
	174	{
	175	s64 lblock64 = lblock;
	176	int rc = 0;
1da177e4 LT	177	xad_t xad;
	178	s64 xaddr;
	179	int xflag;
6628465e	180	s32 xlen = max_blocks;
1da177e4	181
1da177e4 LT	182	/*
	183	* Take appropriate lock on inode
	184	*/
7fab479b DK	185	if (create)
	186	IWRITE_LOCK(ip);
	187	else
	188	IREAD_LOCK(ip);
1da177e4 LT	189
1da177e4 LT	190	if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
7fab479b	191	(!xtLookup(ip, lblock64, max_blocks, &xflag, &xaddr, &xlen, 0)) &&
6628465e	192	xaddr) {
1da177e4 LT	193	if (xflag & XAD_NOTRECORDED) {
	194	if (!create)
	195	/*
	196	* Allocated but not recorded, read treats
	197	* this as a hole
	198	*/
	199	goto unlock;
	200	#ifdef _JFS_4K
	201	XADoffset(&xad, lblock64);
	202	XADlength(&xad, xlen);
	203	XADaddress(&xad, xaddr);
	204	#else /* _JFS_4K */
	205	/*
	206	* As long as block size = 4K, this isn't a problem.
	207	* We should mark the whole page not ABNR, but how
	208	* will we know to mark the other blocks BH_New?
	209	*/
	210	BUG();
	211	#endif /* _JFS_4K */
	212	rc = extRecord(ip, &xad);
	213	if (rc)
	214	goto unlock;
	215	set_buffer_new(bh_result);
	216	}
	217
	218	map_bh(bh_result, ip->i_sb, xaddr);
	219	bh_result->b_size = xlen << ip->i_blkbits;
	220	goto unlock;
	221	}
	222	if (!create)
	223	goto unlock;
	224
	225	/*
	226	* Allocate a new block
	227	*/
	228	#ifdef _JFS_4K
	229	if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
	230	goto unlock;
6628465e	231	rc = extAlloc(ip, xlen, lblock64, &xad, FALSE);
1da177e4 LT	232	if (rc)
	233	goto unlock;
	234
	235	set_buffer_new(bh_result);
	236	map_bh(bh_result, ip->i_sb, addressXAD(&xad));
	237	bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
	238
	239	#else /* _JFS_4K */
	240	/*
	241	* We need to do whatever it takes to keep all but the last buffers
	242	* in 4K pages - see jfs_write.c
	243	*/
	244	BUG();
	245	#endif /* _JFS_4K */
	246
	247	unlock:
	248	/*
	249	* Release lock on inode
	250	*/
7fab479b DK	251	if (create)
	252	IWRITE_UNLOCK(ip);
	253	else
	254	IREAD_UNLOCK(ip);
1da177e4 LT	255	return rc;
	256	}
	257
	258	static int jfs_get_block(struct inode *ip, sector_t lblock,
	259	struct buffer_head *bh_result, int create)
	260	{
	261	return jfs_get_blocks(ip, lblock, 1, bh_result, create);
	262	}
	263
	264	static int jfs_writepage(struct page page, struct writeback_control wbc)
	265	{
	266	return nobh_writepage(page, jfs_get_block, wbc);
	267	}
	268
	269	static int jfs_writepages(struct address_space *mapping,
	270	struct writeback_control *wbc)
	271	{
	272	return mpage_writepages(mapping, wbc, jfs_get_block);
	273	}
	274
	275	static int jfs_readpage(struct file file, struct page page)
	276	{
	277	return mpage_readpage(page, jfs_get_block);
	278	}
	279
	280	static int jfs_readpages(struct file file, struct address_space mapping,
	281	struct list_head *pages, unsigned nr_pages)
	282	{
	283	return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
	284	}
	285
	286	static int jfs_prepare_write(struct file *file,
	287	struct page *page, unsigned from, unsigned to)
	288	{
	289	return nobh_prepare_write(page, from, to, jfs_get_block);
	290	}
	291
	292	static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
	293	{
	294	return generic_block_bmap(mapping, block, jfs_get_block);
	295	}
	296
	297	static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb,
	298	const struct iovec *iov, loff_t offset, unsigned long nr_segs)
	299	{
	300	struct file *file = iocb->ki_filp;
	301	struct inode *inode = file->f_mapping->host;
	302
	303	return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
	304	offset, nr_segs, jfs_get_blocks, NULL);
	305	}
	306
	307	struct address_space_operations jfs_aops = {
	308	.readpage = jfs_readpage,
	309	.readpages = jfs_readpages,
	310	.writepage = jfs_writepage,
	311	.writepages = jfs_writepages,
	312	.sync_page = block_sync_page,
	313	.prepare_write = jfs_prepare_write,
	314	.commit_write = nobh_commit_write,
	315	.bmap = jfs_bmap,
	316	.direct_IO = jfs_direct_IO,
	317	};
	318
319	/*
320	* Guts of jfs_truncate. Called with locks already held. Can be called
321	* with directory for truncating directory index table.
322	*/
323	void jfs_truncate_nolock(struct inode *ip, loff_t length)
324	{
325	loff_t newsize;
326	tid_t tid;
327
328	ASSERT(length >= 0);
329
330	if (test_cflag(COMMIT_Nolink, ip)) {
331	xtTruncate(0, ip, length, COMMIT_WMAP);
332	return;
333	}
334
335	do {
336	tid = txBegin(ip->i_sb, 0);
337
338	/*
339	* The commit_sem cannot be taken before txBegin.
340	* txBegin may block and there is a chance the inode
341	* could be marked dirty and need to be committed
342	* before txBegin unblocks
343	*/
344	down(&JFS_IP(ip)->commit_sem);
345
346	newsize = xtTruncate(tid, ip, length,
347	COMMIT_TRUNCATE \| COMMIT_PWMAP);
348	if (newsize < 0) {
349	txEnd(tid);
350	up(&JFS_IP(ip)->commit_sem);
351	break;
352	}
353
354	ip->i_mtime = ip->i_ctime = CURRENT_TIME;
355	mark_inode_dirty(ip);
356
357	txCommit(tid, 1, &ip, 0);
358	txEnd(tid);
359	up(&JFS_IP(ip)->commit_sem);
360	} while (newsize > length); /* Truncate isn't always atomic */
361	}
362
363	void jfs_truncate(struct inode *ip)
364	{
365	jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
366
367	nobh_truncate_page(ip->i_mapping, ip->i_size);
368
369	IWRITE_LOCK(ip);
370	jfs_truncate_nolock(ip, ip->i_size);
371	IWRITE_UNLOCK(ip);
372	}