ocfs2: Fix incorrect checksum validation error

For local mounts, ocfs2_read_locked_inode() calls ocfs2_read_blocks_sync() to
read the inode off the disk. The latter first checks to see if that block is
cached in the journal, and, if so, returns that block. That is ok.

But ocfs2_read_locked_inode() goes wrong when it tries to validate the checksum
of such blocks. Blocks that are cached in the journal may not have had their
checksum computed as yet. We should not validate the checksums of such blocks.

Fixes ossbz#1282
http://oss.oracle.com/bugzilla/show_bug.cgi?id=1282

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Cc: stable@kernel.org
Singed-off-by: Tao Ma <tao.ma@oracle.com>

diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 0492464916b19324e73425e29c473956b0b4bd33..eece3e05d9d0124d04b81c940c1289f876e700bb 100644 (file)
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -488,7 +488,11 @@ static int ocfs2_read_locked_inode(struct inode *inode,
                                                     OCFS2_BH_IGNORE_CACHE);
        } else {
                status = ocfs2_read_blocks_sync(osb, args->fi_blkno, 1, &bh);
-               if (!status)
+               /*
+                * If buffer is in jbd, then its checksum may not have been
+                * computed as yet.
+                */
+               if (!status && !buffer_jbd(bh))
                        status = ocfs2_validate_inode_block(osb->sb, bh);
        }
        if (status < 0) {