示例#1
0
int
xfs_zero_file_space(
	struct xfs_inode	*ip,
	xfs_off_t		offset,
	xfs_off_t		len)
{
	struct xfs_mount	*mp = ip->i_mount;
	uint			granularity;
	xfs_off_t		start_boundary;
	xfs_off_t		end_boundary;
	int			error;

	granularity = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);

	/*
	 * Round the range of extents we are going to convert inwards.  If the
	 * offset is aligned, then it doesn't get changed so we zero from the
	 * start of the block offset points to.
	 */
	start_boundary = round_up(offset, granularity);
	end_boundary = round_down(offset + len, granularity);

	ASSERT(start_boundary >= offset);
	ASSERT(end_boundary <= offset + len);

	if (start_boundary < end_boundary - 1) {
		/* punch out the page cache over the conversion range */
		truncate_pagecache_range(VFS_I(ip), start_boundary,
					 end_boundary - 1);
		/* convert the blocks */
		error = xfs_alloc_file_space(ip, start_boundary,
					end_boundary - start_boundary - 1,
					XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT);
		if (error)
			goto out;

		/* We've handled the interior of the range, now for the edges */
		if (start_boundary != offset) {
			error = xfs_iozero(ip, offset, start_boundary - offset);
			if (error)
				goto out;
		}

		if (end_boundary != offset + len)
			error = xfs_iozero(ip, end_boundary,
					   offset + len - end_boundary);

	} else {
		/*
		 * It's either a sub-granularity range or the range spanned lies
		 * partially across two adjacent blocks.
		 */
		error = xfs_iozero(ip, offset, len);
	}

out:
	return error;

}
示例#2
0
/*
 * This routine is called to handle zeroing any space in the last block of the
 * file that is beyond the EOF.  We do this since the size is being increased
 * without writing anything to that block and we don't want to read the
 * garbage on the disk.
 */
STATIC int				/* error (positive) */
xfs_zero_last_block(
	struct xfs_inode	*ip,
	xfs_fsize_t		offset,
	xfs_fsize_t		isize)
{
	struct xfs_mount	*mp = ip->i_mount;
	xfs_fileoff_t		last_fsb = XFS_B_TO_FSBT(mp, isize);
	int			zero_offset = XFS_B_FSB_OFFSET(mp, isize);
	int			zero_len;
	int			nimaps = 1;
	int			error = 0;
	struct xfs_bmbt_irec	imap;

	xfs_ilock(ip, XFS_ILOCK_EXCL);
	error = xfs_bmapi_read(ip, last_fsb, 1, &imap, &nimaps, 0);
	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	if (error)
		return error;

	ASSERT(nimaps > 0);

	/*
	 * If the block underlying isize is just a hole, then there
	 * is nothing to zero.
	 */
	if (imap.br_startblock == HOLESTARTBLOCK)
		return 0;

	zero_len = mp->m_sb.sb_blocksize - zero_offset;
	if (isize + zero_len > offset)
		zero_len = offset - isize;
	return xfs_iozero(ip, isize, zero_len);
}
示例#3
0
/*
 * This routine is called to handle zeroing any space in the last
 * block of the file that is beyond the EOF.  We do this since the
 * size is being increased without writing anything to that block
 * and we don't want anyone to read the garbage on the disk.
 */
STATIC int				/* error (positive) */
xfs_zero_last_block(
	xfs_vnode_t	*vp,
	xfs_iocore_t	*io,
	xfs_fsize_t	isize,
	xfs_fsize_t	end_size)
{
	xfs_fileoff_t	last_fsb;
	xfs_mount_t	*mp;
	int		nimaps;
	int		zero_offset;
	int		zero_len;
	int		error = 0;
	xfs_bmbt_irec_t	imap;
	xfs_off_t	loff;

	ASSERT(ismrlocked(io->io_lock, MR_UPDATE) != 0);

	mp = io->io_mount;

	zero_offset = XFS_B_FSB_OFFSET(mp, isize);
	if (zero_offset == 0) {
		/*
		 * There are no extra bytes in the last block on disk to
		 * zero, so return.
		 */
		return 0;
	}

	last_fsb = XFS_B_TO_FSBT(mp, isize);
	nimaps = 1;
	error = XFS_BMAPI(mp, NULL, io, last_fsb, 1, 0, NULL, 0, &imap,
			  &nimaps, NULL, NULL);
	if (error) {
		return error;
	}
	ASSERT(nimaps > 0);
	/*
	 * If the block underlying isize is just a hole, then there
	 * is nothing to zero.
	 */
	if (imap.br_startblock == HOLESTARTBLOCK) {
		return 0;
	}
	/*
	 * Zero the part of the last block beyond the EOF, and write it
	 * out sync.  We need to drop the ilock while we do this so we
	 * don't deadlock when the buffer cache calls back to us.
	 */
	XFS_IUNLOCK(mp, io, XFS_ILOCK_EXCL| XFS_EXTSIZE_RD);
	loff = XFS_FSB_TO_B(mp, last_fsb);

	zero_len = mp->m_sb.sb_blocksize - zero_offset;

	error = xfs_iozero(vp, loff + zero_offset, zero_len, end_size);

	XFS_ILOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD);
	ASSERT(error >= 0);
	return error;
}
示例#4
0
/*
 * This routine is called to handle zeroing any space in the last
 * block of the file that is beyond the EOF.  We do this since the
 * size is being increased without writing anything to that block
 * and we don't want anyone to read the garbage on the disk.
 */
STATIC int				/* error (positive) */
xfs_zero_last_block(
	xfs_inode_t	*ip,
	xfs_fsize_t	offset,
	xfs_fsize_t	isize)
{
	xfs_fileoff_t	last_fsb;
	xfs_mount_t	*mp = ip->i_mount;
	int		nimaps;
	int		zero_offset;
	int		zero_len;
	int		error = 0;
	xfs_bmbt_irec_t	imap;

	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));

	zero_offset = XFS_B_FSB_OFFSET(mp, isize);
	if (zero_offset == 0) {
		/*
		 * There are no extra bytes in the last block on disk to
		 * zero, so return.
		 */
		return 0;
	}

	last_fsb = XFS_B_TO_FSBT(mp, isize);
	nimaps = 1;
	error = xfs_bmapi(NULL, ip, last_fsb, 1, 0, NULL, 0, &imap,
			  &nimaps, NULL, NULL);
	if (error) {
		return error;
	}
	ASSERT(nimaps > 0);
	/*
	 * If the block underlying isize is just a hole, then there
	 * is nothing to zero.
	 */
	if (imap.br_startblock == HOLESTARTBLOCK) {
		return 0;
	}
	/*
	 * Zero the part of the last block beyond the EOF, and write it
	 * out sync.  We need to drop the ilock while we do this so we
	 * don't deadlock when the buffer cache calls back to us.
	 */
	xfs_iunlock(ip, XFS_ILOCK_EXCL);

	zero_len = mp->m_sb.sb_blocksize - zero_offset;
	if (isize + zero_len > offset)
		zero_len = offset - isize;
	error = xfs_iozero(ip, isize, zero_len);

	xfs_ilock(ip, XFS_ILOCK_EXCL);
	ASSERT(error >= 0);
	return error;
}
STATIC int
xfs_zero_last_block(
    xfs_inode_t	*ip,
    xfs_fsize_t	offset,
    xfs_fsize_t	isize)
{
    xfs_fileoff_t	last_fsb;
    xfs_mount_t	*mp = ip->i_mount;
    int		nimaps;
    int		zero_offset;
    int		zero_len;
    int		error = 0;
    xfs_bmbt_irec_t	imap;

    ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));

    zero_offset = XFS_B_FSB_OFFSET(mp, isize);
    if (zero_offset == 0) {
        return 0;
    }

    last_fsb = XFS_B_TO_FSBT(mp, isize);
    nimaps = 1;
    error = xfs_bmapi_read(ip, last_fsb, 1, &imap, &nimaps, 0);
    if (error)
        return error;
    ASSERT(nimaps > 0);
    if (imap.br_startblock == HOLESTARTBLOCK) {
        return 0;
    }
    xfs_iunlock(ip, XFS_ILOCK_EXCL);

    zero_len = mp->m_sb.sb_blocksize - zero_offset;
    if (isize + zero_len > offset)
        zero_len = offset - isize;
    error = xfs_iozero(ip, isize, zero_len);

    xfs_ilock(ip, XFS_ILOCK_EXCL);
    ASSERT(error >= 0);
    return error;
}
示例#6
0
int					/* error (positive) */
xfs_zero_eof(
	vnode_t		*vp,
	xfs_iocore_t	*io,
	xfs_off_t	offset,		/* starting I/O offset */
	xfs_fsize_t	isize,		/* current inode size */
	xfs_fsize_t	end_size)	/* terminal inode size */
{
	struct inode	*ip = LINVFS_GET_IP(vp);
	xfs_fileoff_t	start_zero_fsb;
	xfs_fileoff_t	end_zero_fsb;
	xfs_fileoff_t	prev_zero_fsb;
	xfs_fileoff_t	zero_count_fsb;
	xfs_fileoff_t	last_fsb;
	xfs_extlen_t	buf_len_fsb;
	xfs_extlen_t	prev_zero_count;
	xfs_mount_t	*mp;
	int		nimaps;
	int		error = 0;
	xfs_bmbt_irec_t	imap;
	loff_t		loff;
	size_t		lsize;

	ASSERT(ismrlocked(io->io_lock, MR_UPDATE));
	ASSERT(ismrlocked(io->io_iolock, MR_UPDATE));

	mp = io->io_mount;

	/*
	 * First handle zeroing the block on which isize resides.
	 * We only zero a part of that block so it is handled specially.
	 */
	error = xfs_zero_last_block(ip, io, offset, isize, end_size);
	if (error) {
		ASSERT(ismrlocked(io->io_lock, MR_UPDATE));
		ASSERT(ismrlocked(io->io_iolock, MR_UPDATE));
		return error;
	}

	/*
	 * Calculate the range between the new size and the old
	 * where blocks needing to be zeroed may exist.  To get the
	 * block where the last byte in the file currently resides,
	 * we need to subtract one from the size and truncate back
	 * to a block boundary.  We subtract 1 in case the size is
	 * exactly on a block boundary.
	 */
	last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1;
	start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
	end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1);
	ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb);
	if (last_fsb == end_zero_fsb) {
		/*
		 * The size was only incremented on its last block.
		 * We took care of that above, so just return.
		 */
		return 0;
	}

	ASSERT(start_zero_fsb <= end_zero_fsb);
	prev_zero_fsb = NULLFILEOFF;
	prev_zero_count = 0;
	while (start_zero_fsb <= end_zero_fsb) {
		nimaps = 1;
		zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;
		error = XFS_BMAPI(mp, NULL, io, start_zero_fsb, zero_count_fsb,
				  0, NULL, 0, &imap, &nimaps, NULL);
		if (error) {
			ASSERT(ismrlocked(io->io_lock, MR_UPDATE));
			ASSERT(ismrlocked(io->io_iolock, MR_UPDATE));
			return error;
		}
		ASSERT(nimaps > 0);

		if (imap.br_state == XFS_EXT_UNWRITTEN ||
		    imap.br_startblock == HOLESTARTBLOCK) {
			/*
			 * This loop handles initializing pages that were
			 * partially initialized by the code below this
			 * loop. It basically zeroes the part of the page
			 * that sits on a hole and sets the page as P_HOLE
			 * and calls remapf if it is a mapped file.
			 */
			prev_zero_fsb = NULLFILEOFF;
			prev_zero_count = 0;
			start_zero_fsb = imap.br_startoff +
					 imap.br_blockcount;
			ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
			continue;
		}

		/*
		 * There are blocks in the range requested.
		 * Zero them a single write at a time.  We actually
		 * don't zero the entire range returned if it is
		 * too big and simply loop around to get the rest.
		 * That is not the most efficient thing to do, but it
		 * is simple and this path should not be exercised often.
		 */
		buf_len_fsb = XFS_FILBLKS_MIN(imap.br_blockcount,
					      mp->m_writeio_blocks << 8);
		/*
		 * Drop the inode lock while we're doing the I/O.
		 * We'll still have the iolock to protect us.
		 */
		XFS_IUNLOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD);

		loff = XFS_FSB_TO_B(mp, start_zero_fsb);
		lsize = XFS_FSB_TO_B(mp, buf_len_fsb);

		error = xfs_iozero(ip, loff, lsize, end_size);

		if (error) {
			goto out_lock;
		}

		prev_zero_fsb = start_zero_fsb;
		prev_zero_count = buf_len_fsb;
		start_zero_fsb = imap.br_startoff + buf_len_fsb;
		ASSERT(start_zero_fsb <= (end_zero_fsb + 1));

		XFS_ILOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD);
	}

	return 0;

out_lock:

	XFS_ILOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD);
	ASSERT(error >= 0);
	return error;
}
示例#7
0
/*
 * Zero any on disk space between the current EOF and the new, larger EOF.
 *
 * This handles the normal case of zeroing the remainder of the last block in
 * the file and the unusual case of zeroing blocks out beyond the size of the
 * file.  This second case only happens with fixed size extents and when the
 * system crashes before the inode size was updated but after blocks were
 * allocated.
 *
 * Expects the iolock to be held exclusive, and will take the ilock internally.
 */
int					/* error (positive) */
xfs_zero_eof(
	struct xfs_inode	*ip,
	xfs_off_t		offset,		/* starting I/O offset */
	xfs_fsize_t		isize)		/* current inode size */
{
	struct xfs_mount	*mp = ip->i_mount;
	xfs_fileoff_t		start_zero_fsb;
	xfs_fileoff_t		end_zero_fsb;
	xfs_fileoff_t		zero_count_fsb;
	xfs_fileoff_t		last_fsb;
	xfs_fileoff_t		zero_off;
	xfs_fsize_t		zero_len;
	int			nimaps;
	int			error = 0;
	struct xfs_bmbt_irec	imap;

	ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
	ASSERT(offset > isize);

	/*
	 * First handle zeroing the block on which isize resides.
	 *
	 * We only zero a part of that block so it is handled specially.
	 */
	if (XFS_B_FSB_OFFSET(mp, isize) != 0) {
		error = xfs_zero_last_block(ip, offset, isize);
		if (error)
			return error;
	}

	/*
	 * Calculate the range between the new size and the old where blocks
	 * needing to be zeroed may exist.
	 *
	 * To get the block where the last byte in the file currently resides,
	 * we need to subtract one from the size and truncate back to a block
	 * boundary.  We subtract 1 in case the size is exactly on a block
	 * boundary.
	 */
	last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1;
	start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
	end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1);
	ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb);
	if (last_fsb == end_zero_fsb) {
		/*
		 * The size was only incremented on its last block.
		 * We took care of that above, so just return.
		 */
		return 0;
	}

	ASSERT(start_zero_fsb <= end_zero_fsb);
	while (start_zero_fsb <= end_zero_fsb) {
		nimaps = 1;
		zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;

		xfs_ilock(ip, XFS_ILOCK_EXCL);
		error = xfs_bmapi_read(ip, start_zero_fsb, zero_count_fsb,
					  &imap, &nimaps, 0);
		xfs_iunlock(ip, XFS_ILOCK_EXCL);
		if (error)
			return error;

		ASSERT(nimaps > 0);

		if (imap.br_state == XFS_EXT_UNWRITTEN ||
		    imap.br_startblock == HOLESTARTBLOCK) {
			start_zero_fsb = imap.br_startoff + imap.br_blockcount;
			ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
			continue;
		}

		/*
		 * There are blocks we need to zero.
		 */
		zero_off = XFS_FSB_TO_B(mp, start_zero_fsb);
		zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount);

		if ((zero_off + zero_len) > offset)
			zero_len = offset - zero_off;

		error = xfs_iozero(ip, zero_off, zero_len);
		if (error)
			return error;

		start_zero_fsb = imap.br_startoff + imap.br_blockcount;
		ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
	}

	return 0;
}
示例#8
0
int					/* error (positive) */
xfs_zero_eof(
	xfs_inode_t	*ip,
	xfs_off_t	offset,		/* starting I/O offset */
	xfs_fsize_t	isize)		/* current inode size */
{
	xfs_mount_t	*mp = ip->i_mount;
	xfs_fileoff_t	start_zero_fsb;
	xfs_fileoff_t	end_zero_fsb;
	xfs_fileoff_t	zero_count_fsb;
	xfs_fileoff_t	last_fsb;
	xfs_fileoff_t	zero_off;
	xfs_fsize_t	zero_len;
	int		nimaps;
	int		error = 0;
	xfs_bmbt_irec_t	imap;

	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
	ASSERT(offset > isize);

	/*
	 * First handle zeroing the block on which isize resides.
	 * We only zero a part of that block so it is handled specially.
	 */
	error = xfs_zero_last_block(ip, offset, isize);
	if (error) {
		ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
		return error;
	}

	/*
	 * Calculate the range between the new size and the old
	 * where blocks needing to be zeroed may exist.  To get the
	 * block where the last byte in the file currently resides,
	 * we need to subtract one from the size and truncate back
	 * to a block boundary.  We subtract 1 in case the size is
	 * exactly on a block boundary.
	 */
	last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1;
	start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
	end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1);
	ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb);
	if (last_fsb == end_zero_fsb) {
		/*
		 * The size was only incremented on its last block.
		 * We took care of that above, so just return.
		 */
		return 0;
	}

	ASSERT(start_zero_fsb <= end_zero_fsb);
	while (start_zero_fsb <= end_zero_fsb) {
		nimaps = 1;
		zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;
		error = xfs_bmapi(NULL, ip, start_zero_fsb, zero_count_fsb,
				  0, NULL, 0, &imap, &nimaps, NULL, NULL);
		if (error) {
			ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
			return error;
		}
		ASSERT(nimaps > 0);

		if (imap.br_state == XFS_EXT_UNWRITTEN ||
		    imap.br_startblock == HOLESTARTBLOCK) {
			/*
			 * This loop handles initializing pages that were
			 * partially initialized by the code below this
			 * loop. It basically zeroes the part of the page
			 * that sits on a hole and sets the page as P_HOLE
			 * and calls remapf if it is a mapped file.
			 */
			start_zero_fsb = imap.br_startoff + imap.br_blockcount;
			ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
			continue;
		}

		/*
		 * There are blocks we need to zero.
		 * Drop the inode lock while we're doing the I/O.
		 * We'll still have the iolock to protect us.
		 */
		xfs_iunlock(ip, XFS_ILOCK_EXCL);

		zero_off = XFS_FSB_TO_B(mp, start_zero_fsb);
		zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount);

		if ((zero_off + zero_len) > offset)
			zero_len = offset - zero_off;

		error = xfs_iozero(ip, zero_off, zero_len);
		if (error) {
			goto out_lock;
		}

		start_zero_fsb = imap.br_startoff + imap.br_blockcount;
		ASSERT(start_zero_fsb <= (end_zero_fsb + 1));

		xfs_ilock(ip, XFS_ILOCK_EXCL);
	}

	return 0;

out_lock:
	xfs_ilock(ip, XFS_ILOCK_EXCL);
	ASSERT(error >= 0);
	return error;
}
int
xfs_zero_eof(
    xfs_inode_t	*ip,
    xfs_off_t	offset,
    xfs_fsize_t	isize)
{
    xfs_mount_t	*mp = ip->i_mount;
    xfs_fileoff_t	start_zero_fsb;
    xfs_fileoff_t	end_zero_fsb;
    xfs_fileoff_t	zero_count_fsb;
    xfs_fileoff_t	last_fsb;
    xfs_fileoff_t	zero_off;
    xfs_fsize_t	zero_len;
    int		nimaps;
    int		error = 0;
    xfs_bmbt_irec_t	imap;

    ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
    ASSERT(offset > isize);

    error = xfs_zero_last_block(ip, offset, isize);
    if (error) {
        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
        return error;
    }

    last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1;
    start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
    end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1);
    ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb);
    if (last_fsb == end_zero_fsb) {
        return 0;
    }

    ASSERT(start_zero_fsb <= end_zero_fsb);
    while (start_zero_fsb <= end_zero_fsb) {
        nimaps = 1;
        zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;
        error = xfs_bmapi_read(ip, start_zero_fsb, zero_count_fsb,
                               &imap, &nimaps, 0);
        if (error) {
            ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
            return error;
        }
        ASSERT(nimaps > 0);

        if (imap.br_state == XFS_EXT_UNWRITTEN ||
                imap.br_startblock == HOLESTARTBLOCK) {
            start_zero_fsb = imap.br_startoff + imap.br_blockcount;
            ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
            continue;
        }

        xfs_iunlock(ip, XFS_ILOCK_EXCL);

        zero_off = XFS_FSB_TO_B(mp, start_zero_fsb);
        zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount);

        if ((zero_off + zero_len) > offset)
            zero_len = offset - zero_off;

        error = xfs_iozero(ip, zero_off, zero_len);
        if (error) {
            goto out_lock;
        }

        start_zero_fsb = imap.br_startoff + imap.br_blockcount;
        ASSERT(start_zero_fsb <= (end_zero_fsb + 1));

        xfs_ilock(ip, XFS_ILOCK_EXCL);
    }

    return 0;

out_lock:
    xfs_ilock(ip, XFS_ILOCK_EXCL);
    ASSERT(error >= 0);
    return error;
}