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xfs: cow unwritten conversion uses uninitialized dfops 

A couple COW fork unwritten extent conversion helpers pass an
uninitialized dfops pointer to xfs_bmapi_write(). This does not
cause problems because conversion does not use a transaction or the
dfops structure for the COW fork.  Drop the uninitialized usage of
dfops in these codepaths and pass NULL along to xfs_bmapi_write()
instead.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Brian Foster 2018-07-11 22:26:06 -07:00 committed by Darrick J. Wong
parent 98c1a7c0ec
commit 8a74938649
1 changed files with 4 additions and 7 deletions
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11
fs/xfs/xfs_reflink.c
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@ -312,8 +312,7 @@ xfs_reflink_convert_cow_extent(
struct xfs_inode *ip,
struct xfs_bmbt_irec *imap,
xfs_fileoff_t offset_fsb,
xfs_filblks_t count_fsb,
struct xfs_defer_ops *dfops)
xfs_filblks_t count_fsb)
{
xfs_fsblock_t first_block = NULLFSBLOCK;
int nimaps = 1;
@ -327,7 +326,7 @@ xfs_reflink_convert_cow_extent(
return 0;
return xfs_bmapi_write(NULL, ip, imap->br_startoff, imap->br_blockcount,
XFS_BMAPI_COWFORK | XFS_BMAPI_CONVERT, &first_block,
0, imap, &nimaps, dfops);
0, imap, &nimaps, NULL);
}
/* Convert all of the unwritten CoW extents in a file's range to real ones. */
@ -342,7 +341,6 @@ xfs_reflink_convert_cow(
xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + count);
xfs_filblks_t count_fsb = end_fsb - offset_fsb;
struct xfs_bmbt_irec imap;
struct xfs_defer_ops dfops;
xfs_fsblock_t first_block = NULLFSBLOCK;
int nimaps = 1, error = 0;
@ -352,7 +350,7 @@ xfs_reflink_convert_cow(
error = xfs_bmapi_write(NULL, ip, offset_fsb, count_fsb,
XFS_BMAPI_COWFORK | XFS_BMAPI_CONVERT |
XFS_BMAPI_CONVERT_ONLY, &first_block, 0, &imap, &nimaps,
&dfops);
NULL);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
}
@ -458,8 +456,7 @@ retry:
if (nimaps == 0)
return -ENOSPC;
convert:
return xfs_reflink_convert_cow_extent(ip, imap, offset_fsb, count_fsb,
&dfops);
return xfs_reflink_convert_cow_extent(ip, imap, offset_fsb, count_fsb);
out_bmap_cancel:
xfs_defer_cancel(&dfops);
xfs_trans_unreserve_quota_nblks(tp, ip, (long)resblks, 0,