From 1075b6106024e51af7a5108626091322d2e91710 Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Wed, 18 Jan 2012 14:41:45 -0600 Subject: [PATCH 118/129] xfs: fix endian conversion issue in discard code commit b1c770c273a4787069306fc82aab245e9ac72e9d upstream When finding the longest extent in an AG, we read the value directly out of the AGF buffer without endian conversion. This will give an incorrect length, resulting in FITRIM operations potentially not trimming everything that it should. Signed-off-by: Dave Chinner Reviewed-by: Christoph Hellwig Signed-off-by: Ben Myers Signed-off-by: Greg Kroah-Hartman --- fs/xfs/xfs_discard.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/xfs/xfs_discard.c b/fs/xfs/xfs_discard.c index 8a24f0c..286a051 100644 --- a/fs/xfs/xfs_discard.c +++ b/fs/xfs/xfs_discard.c @@ -68,7 +68,7 @@ xfs_trim_extents( * Look up the longest btree in the AGF and start with it. */ error = xfs_alloc_lookup_le(cur, 0, - XFS_BUF_TO_AGF(agbp)->agf_longest, &i); + be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_longest), &i); if (error) goto out_del_cursor; @@ -84,7 +84,7 @@ xfs_trim_extents( if (error) goto out_del_cursor; XFS_WANT_CORRUPTED_GOTO(i == 1, out_del_cursor); - ASSERT(flen <= XFS_BUF_TO_AGF(agbp)->agf_longest); + ASSERT(flen <= be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_longest)); /* * Too small? Give up. -- 1.7.9.5