xfs: fix endian conversion issue in discard code
Dave Chinner [Wed, 21 Dec 2011 00:07:42 +0000 (00:07 +0000)]
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 <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>

fs/xfs/xfs_discard.c

index 8a24f0c..286a051 100644 (file)
@@ -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.