[linux-2.6-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"


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 == 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.
		 */
		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
b1b5d7f9	131	if (!is_bad_inode(inode) &&
6cb1269b	132	(JFS_IP(inode)->fileset == FILESYSTEM_I)) {
32983696	133	truncate_inode_pages(&inode->i_data, 0);
fef26658	134
b1b5d7f9 DK	135	if (test_cflag(COMMIT_Freewmap, inode))
b1b5d7f9 DK	136	jfs_free_zero_link(inode);
1da177e4	137
b1b5d7f9	138	diFree(inode);
1da177e4	139
b1b5d7f9 DK	140	/*
	141	* Free the inode from the quota allocation.
	142	*/
	143	DQUOT_INIT(inode);
	144	DQUOT_FREE_INODE(inode);
	145	DQUOT_DROP(inode);
	146	}
1da177e4 LT	147
	148	clear_inode(inode);
	149	}
	150
	151	void jfs_dirty_inode(struct inode *inode)
	152	{
	153	static int noisy = 5;
	154
	155	if (isReadOnly(inode)) {
	156	if (!special_file(inode->i_mode) && noisy) {
	157	/* kernel allows writes to devices on read-only
	158	* partitions and may try to mark inode dirty
	159	*/
	160	jfs_err("jfs_dirty_inode called on read-only volume");
	161	jfs_err("Is remount racy?");
	162	noisy--;
	163	}
	164	return;
	165	}
	166
	167	set_cflag(COMMIT_Dirty, inode);
	168	}
	169
	170	static int
	171	jfs_get_blocks(struct inode *ip, sector_t lblock, unsigned long max_blocks,
	172	struct buffer_head *bh_result, int create)
	173	{
	174	s64 lblock64 = lblock;
	175	int rc = 0;
1da177e4 LT	176	xad_t xad;
	177	s64 xaddr;
	178	int xflag;
6628465e	179	s32 xlen = max_blocks;
1da177e4	180
1da177e4 LT	181	/*
	182	* Take appropriate lock on inode
	183	*/
7fab479b DK	184	if (create)
	185	IWRITE_LOCK(ip);
	186	else
	187	IREAD_LOCK(ip);
1da177e4 LT	188
1da177e4 LT	189	if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
7fab479b	190	(!xtLookup(ip, lblock64, max_blocks, &xflag, &xaddr, &xlen, 0)) &&
6628465e	191	xaddr) {
1da177e4 LT	192	if (xflag & XAD_NOTRECORDED) {
	193	if (!create)
	194	/*
	195	* Allocated but not recorded, read treats
	196	* this as a hole
	197	*/
	198	goto unlock;
	199	#ifdef _JFS_4K
	200	XADoffset(&xad, lblock64);
	201	XADlength(&xad, xlen);
	202	XADaddress(&xad, xaddr);
	203	#else /* _JFS_4K */
	204	/*
	205	* As long as block size = 4K, this isn't a problem.
	206	* We should mark the whole page not ABNR, but how
	207	* will we know to mark the other blocks BH_New?
	208	*/
	209	BUG();
	210	#endif /* _JFS_4K */
	211	rc = extRecord(ip, &xad);
	212	if (rc)
	213	goto unlock;
	214	set_buffer_new(bh_result);
	215	}
	216
	217	map_bh(bh_result, ip->i_sb, xaddr);
	218	bh_result->b_size = xlen << ip->i_blkbits;
	219	goto unlock;
	220	}
	221	if (!create)
	222	goto unlock;
	223
	224	/*
	225	* Allocate a new block
	226	*/
	227	#ifdef _JFS_4K
	228	if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
	229	goto unlock;
6628465e	230	rc = extAlloc(ip, xlen, lblock64, &xad, FALSE);
1da177e4 LT	231	if (rc)
	232	goto unlock;
	233
	234	set_buffer_new(bh_result);
	235	map_bh(bh_result, ip->i_sb, addressXAD(&xad));
	236	bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
	237
	238	#else /* _JFS_4K */
	239	/*
	240	* We need to do whatever it takes to keep all but the last buffers
	241	* in 4K pages - see jfs_write.c
	242	*/
	243	BUG();
	244	#endif /* _JFS_4K */
	245
	246	unlock:
	247	/*
	248	* Release lock on inode
	249	*/
7fab479b DK	250	if (create)
	251	IWRITE_UNLOCK(ip);
	252	else
	253	IREAD_UNLOCK(ip);
1da177e4 LT	254	return rc;
	255	}
	256
	257	static int jfs_get_block(struct inode *ip, sector_t lblock,
	258	struct buffer_head *bh_result, int create)
	259	{
	260	return jfs_get_blocks(ip, lblock, 1, bh_result, create);
	261	}
	262
	263	static int jfs_writepage(struct page page, struct writeback_control wbc)
	264	{
	265	return nobh_writepage(page, jfs_get_block, wbc);
	266	}
	267
	268	static int jfs_writepages(struct address_space *mapping,
	269	struct writeback_control *wbc)
	270	{
	271	return mpage_writepages(mapping, wbc, jfs_get_block);
	272	}
	273
	274	static int jfs_readpage(struct file file, struct page page)
	275	{
	276	return mpage_readpage(page, jfs_get_block);
	277	}
	278
	279	static int jfs_readpages(struct file file, struct address_space mapping,
	280	struct list_head *pages, unsigned nr_pages)
	281	{
	282	return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
	283	}
	284
	285	static int jfs_prepare_write(struct file *file,
	286	struct page *page, unsigned from, unsigned to)
	287	{
	288	return nobh_prepare_write(page, from, to, jfs_get_block);
	289	}
	290
	291	static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
	292	{
	293	return generic_block_bmap(mapping, block, jfs_get_block);
	294	}
	295
	296	static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb,
	297	const struct iovec *iov, loff_t offset, unsigned long nr_segs)
	298	{
	299	struct file *file = iocb->ki_filp;
	300	struct inode *inode = file->f_mapping->host;
	301
	302	return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
	303	offset, nr_segs, jfs_get_blocks, NULL);
	304	}
	305
	306	struct address_space_operations jfs_aops = {
	307	.readpage = jfs_readpage,
	308	.readpages = jfs_readpages,
	309	.writepage = jfs_writepage,
	310	.writepages = jfs_writepages,
	311	.sync_page = block_sync_page,
	312	.prepare_write = jfs_prepare_write,
	313	.commit_write = nobh_commit_write,
	314	.bmap = jfs_bmap,
	315	.direct_IO = jfs_direct_IO,
	316	};
	317
318	/*
319	* Guts of jfs_truncate. Called with locks already held. Can be called
320	* with directory for truncating directory index table.
321	*/
322	void jfs_truncate_nolock(struct inode *ip, loff_t length)
323	{
324	loff_t newsize;
325	tid_t tid;
326
327	ASSERT(length >= 0);
328
329	if (test_cflag(COMMIT_Nolink, ip)) {
330	xtTruncate(0, ip, length, COMMIT_WMAP);
331	return;
332	}
333
334	do {
335	tid = txBegin(ip->i_sb, 0);
336
337	/*
338	* The commit_sem cannot be taken before txBegin.
339	* txBegin may block and there is a chance the inode
340	* could be marked dirty and need to be committed
341	* before txBegin unblocks
342	*/
343	down(&JFS_IP(ip)->commit_sem);
344
345	newsize = xtTruncate(tid, ip, length,
346	COMMIT_TRUNCATE \| COMMIT_PWMAP);
347	if (newsize < 0) {
348	txEnd(tid);
349	up(&JFS_IP(ip)->commit_sem);
350	break;
351	}
352
353	ip->i_mtime = ip->i_ctime = CURRENT_TIME;
354	mark_inode_dirty(ip);
355
356	txCommit(tid, 1, &ip, 0);
357	txEnd(tid);
358	up(&JFS_IP(ip)->commit_sem);
359	} while (newsize > length); /* Truncate isn't always atomic */
360	}
361
362	void jfs_truncate(struct inode *ip)
363	{
364	jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
365
366	nobh_truncate_page(ip->i_mapping, ip->i_size);
367
368	IWRITE_LOCK(ip);
369	jfs_truncate_nolock(ip, ip->i_size);
370	IWRITE_UNLOCK(ip);
371	}