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xfs: Fix uninitialized variable in xfs_reflink_reserve_cow_range() 

with gcc 4.1.2:

    fs/xfs/xfs_reflink.c: In function xfs_reflink_reserve_cow_range:
    fs/xfs/xfs_reflink.c:327: warning: error may be used uninitialized in this function

Indeed, if "count" is zero, the function will return an uninitialized
error value.

While "count" is unlikely to be zero, this function is called through
the public iomap API. Hence fix this by preinitializing error to zero.

Fixes: 2a06705cd5 ("xfs: create delalloc extents in CoW fork")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Geert Uytterhoeven 2016-10-20 15:41:48 +11:00 committed by Dave Chinner
parent 1d55a4bfd0
commit 1be7f9be0e
1 changed files with 1 additions and 1 deletions
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fs/xfs/xfs_reflink.c
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@ -324,7 +324,7 @@ xfs_reflink_reserve_cow_range(
struct xfs_mount *mp = ip->i_mount;
xfs_fileoff_t offset_fsb, end_fsb;
bool skipped = false;
int error;
int error = 0;
trace_xfs_reflink_reserve_cow_range(ip, offset, count);