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xfs: fix off-by-one error in xfs_rtalloc_query_range 

In commit 8ad560d256 ("xfs: strengthen rtalloc query range checks")
we strengthened the input parameter checks in the rtbitmap range query
function, but introduced an off-by-one error in the process.  The call
to xfs_rtfind_forw deals with the high key being rextents, but we clamp
the high key to rextents - 1.  This causes the returned results to stop
one block short of the end of the rtdev, which is incorrect.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2018-06-21 23:26:58 -07:00
parent 232d0a24b0
commit a3a374bf18
1 changed files with 2 additions and 2 deletions
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4
fs/xfs/libxfs/xfs_rtbitmap.c
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@ -1029,8 +1029,8 @@ xfs_rtalloc_query_range(
if (low_rec->ar_startext >= mp->m_sb.sb_rextents ||
low_rec->ar_startext == high_rec->ar_startext)
return 0;
if (high_rec->ar_startext >= mp->m_sb.sb_rextents)
high_rec->ar_startext = mp->m_sb.sb_rextents - 1;
if (high_rec->ar_startext > mp->m_sb.sb_rextents)
high_rec->ar_startext = mp->m_sb.sb_rextents;
/* Iterate the bitmap, looking for discrepancies. */
rtstart = low_rec->ar_startext;