xfs: verify btree blocks as they are read from disk

Add an btree block verify callback function and pass it into the
buffer read functions. Because each different btree block type
requires different verification, add a function to the ops structure
that is called from the generic code.

Also, propagate the verification callback functions through the
readahead functions, and into the external bmap and bulkstat inode
readahead code that uses the generic btree buffer read functions.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Phil White <pwhite@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/fs/xfs/xfs_btree.h b/fs/xfs/xfs_btree.h
index c9cf2d00e236..3a4c314047a0 100644
--- a/fs/xfs/xfs_btree.h
+++ b/fs/xfs/xfs_btree.h
@@ -188,6 +188,7 @@ struct xfs_btree_ops {
         __int64_t (*key_diff)(struct xfs_btree_cur *cur,
                               union xfs_btree_key *key);
 
+        void    (*read_verify)(struct xfs_buf *bp);
 #ifdef DEBUG
         /* check that k1 is lower than k2 */
         int     (*keys_inorder)(struct xfs_btree_cur *cur,
@@ -355,7 +356,8 @@ xfs_btree_read_bufl(
         xfs_fsblock_t           fsbno,  /* file system block number */
         uint                    lock,   /* lock flags for read_buf */
         struct xfs_buf          **bpp,  /* buffer for fsbno */
-        int                     refval);/* ref count value for buffer */
+        int                     refval, /* ref count value for buffer */
+        xfs_buf_iodone_t        verify);
 
 /*
  * Read-ahead the block, don't wait for it, don't return a buffer.
@@ -365,7 +367,8 @@ void					/* error */
 xfs_btree_reada_bufl(
         struct xfs_mount        *mp,    /* file system mount point */
         xfs_fsblock_t           fsbno,  /* file system block number */
-        xfs_extlen_t            count); /* count of filesystem blocks */
+        xfs_extlen_t            count,  /* count of filesystem blocks */
+        xfs_buf_iodone_t        verify);
 
 /*
  * Read-ahead the block, don't wait for it, don't return a buffer.
@@ -376,7 +379,8 @@ xfs_btree_reada_bufs(
         struct xfs_mount        *mp,    /* file system mount point */
         xfs_agnumber_t          agno,   /* allocation group number */
         xfs_agblock_t           agbno,  /* allocation group block number */
-        xfs_extlen_t            count); /* count of filesystem blocks */
+        xfs_extlen_t            count,  /* count of filesystem blocks */
+        xfs_buf_iodone_t        verify);
 
 /*
  * Initialise a new btree block header