diff options
Diffstat (limited to 'fs/xfs/xfs_bmap_btree.c')
| -rw-r--r-- | fs/xfs/xfs_bmap_btree.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/fs/xfs/xfs_bmap_btree.c b/fs/xfs/xfs_bmap_btree.c index 862084a47a7..bddca9b9286 100644 --- a/fs/xfs/xfs_bmap_btree.c +++ b/fs/xfs/xfs_bmap_btree.c @@ -36,6 +36,7 @@ #include "xfs_bmap.h" #include "xfs_error.h" #include "xfs_quota.h" +#include "xfs_trace.h" /* * Determine the extent state. @@ -707,6 +708,51 @@ xfs_bmbt_key_diff( cur->bc_rec.b.br_startoff; } +void +xfs_bmbt_read_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 lblock_ok; /* block passes checks */ + + /* magic number and level verification. + * + * We don't know waht fork we belong to, so just verify that the level + * is less than the maximum of the two. Later checks will be more + * precise. + */ + level = be16_to_cpu(block->bb_level); + lblock_ok = block->bb_magic == cpu_to_be32(XFS_BMAP_MAGIC) && + level < max(mp->m_bm_maxlevels[0], mp->m_bm_maxlevels[1]); + + /* numrecs verification */ + lblock_ok = lblock_ok && + be16_to_cpu(block->bb_numrecs) <= mp->m_bmap_dmxr[level != 0]; + + /* sibling pointer verification */ + lblock_ok = lblock_ok && + block->bb_u.l.bb_leftsib && + (block->bb_u.l.bb_leftsib == cpu_to_be64(NULLDFSBNO) || + XFS_FSB_SANITY_CHECK(mp, + be64_to_cpu(block->bb_u.l.bb_leftsib))) && + block->bb_u.l.bb_rightsib && + (block->bb_u.l.bb_rightsib == cpu_to_be64(NULLDFSBNO) || + XFS_FSB_SANITY_CHECK(mp, + be64_to_cpu(block->bb_u.l.bb_rightsib))); + + if (!lblock_ok) { + trace_xfs_btree_corrupt(bp, _RET_IP_); + XFS_CORRUPTION_ERROR("xfs_bmbt_read_verify", + XFS_ERRLEVEL_LOW, mp, block); + xfs_buf_ioerror(bp, EFSCORRUPTED); + } + + bp->b_iodone = NULL; + xfs_buf_ioend(bp, 0); +} + #ifdef DEBUG STATIC int xfs_bmbt_keys_inorder( @@ -746,6 +792,7 @@ static const struct xfs_btree_ops xfs_bmbt_ops = { .init_rec_from_cur = xfs_bmbt_init_rec_from_cur, .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur, .key_diff = xfs_bmbt_key_diff, + .read_verify = xfs_bmbt_read_verify, #ifdef DEBUG .keys_inorder = xfs_bmbt_keys_inorder, .recs_inorder = xfs_bmbt_recs_inorder, |