xfs: convert buffer verifiers to an ops structure.

[deliverable/linux.git] / fs / xfs / xfs_ialloc_btree.c

diff --git a/fs/xfs/xfs_ialloc_btree.c b/fs/xfs/xfs_ialloc_btree.c
index 2b8b7a37aa185dace60a254403eaa22c8a3b1daa..bec344b365079fc51c9a2057ccb9ae7982ab6ec1 100644 (file)
--- a/fs/xfs/xfs_ialloc_btree.c
+++ b/fs/xfs/xfs_ialloc_btree.c
@@ -33,6 +33,7 @@
 #include "xfs_ialloc.h"
 #include "xfs_alloc.h"
 #include "xfs_error.h"
+#include "xfs_trace.h"
 
 
 STATIC int
@@ -181,6 +182,59 @@ xfs_inobt_key_diff(
                          cur->bc_rec.i.ir_startino;
 }
 
+void
+xfs_inobt_verify(
+       struct xfs_buf          *bp)
+{
+       struct xfs_mount        *mp = bp->b_target->bt_mount;
+       struct xfs_btree_block  *block = XFS_BUF_TO_BLOCK(bp);
+       unsigned int            level;
+       int                     sblock_ok; /* block passes checks */
+
+       /* magic number and level verification */
+       level = be16_to_cpu(block->bb_level);
+       sblock_ok = block->bb_magic == cpu_to_be32(XFS_IBT_MAGIC) &&
+                   level < mp->m_in_maxlevels;
+
+       /* numrecs verification */
+       sblock_ok = sblock_ok &&
+               be16_to_cpu(block->bb_numrecs) <= mp->m_inobt_mxr[level != 0];
+
+       /* sibling pointer verification */
+       sblock_ok = sblock_ok &&
+               (block->bb_u.s.bb_leftsib == cpu_to_be32(NULLAGBLOCK) ||
+                be32_to_cpu(block->bb_u.s.bb_leftsib) < mp->m_sb.sb_agblocks) &&
+               block->bb_u.s.bb_leftsib &&
+               (block->bb_u.s.bb_rightsib == cpu_to_be32(NULLAGBLOCK) ||
+                be32_to_cpu(block->bb_u.s.bb_rightsib) < mp->m_sb.sb_agblocks) &&
+               block->bb_u.s.bb_rightsib;
+
+       if (!sblock_ok) {
+               trace_xfs_btree_corrupt(bp, _RET_IP_);
+               XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, block);
+               xfs_buf_ioerror(bp, EFSCORRUPTED);
+       }
+}
+
+static void
+xfs_inobt_read_verify(
+       struct xfs_buf  *bp)
+{
+       xfs_inobt_verify(bp);
+}
+
+static void
+xfs_inobt_write_verify(
+       struct xfs_buf  *bp)
+{
+       xfs_inobt_verify(bp);
+}
+
+const struct xfs_buf_ops xfs_inobt_buf_ops = {
+       .verify_read = xfs_inobt_read_verify,
+       .verify_write = xfs_inobt_write_verify,
+};
+
 #ifdef DEBUG
 STATIC int
 xfs_inobt_keys_inorder(
@@ -218,6 +272,7 @@ static const struct xfs_btree_ops xfs_inobt_ops = {
        .init_rec_from_cur      = xfs_inobt_init_rec_from_cur,
        .init_ptr_from_cur      = xfs_inobt_init_ptr_from_cur,
        .key_diff               = xfs_inobt_key_diff,
+       .buf_ops                = &xfs_inobt_buf_ops,
 #ifdef DEBUG
        .keys_inorder           = xfs_inobt_keys_inorder,
        .recs_inorder           = xfs_inobt_recs_inorder,