Looks good:
Reviewed-by: Allison Henderson <allison.henderson@xxxxxxxxxx>
On 06/21/2018 11:31 AM, Darrick J. Wong wrote:
From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
In commit 8ad560d2565e6 ("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@xxxxxxxxxx>
---
fs/xfs/libxfs/xfs_rtbitmap.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_rtbitmap.c b/fs/xfs/libxfs/xfs_rtbitmap.c
index 65fc4ed2e9a1..b228c821bae6 100644
--- a/fs/xfs/libxfs/xfs_rtbitmap.c
+++ b/fs/xfs/libxfs/xfs_rtbitmap.c
@@ -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;
--
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