From 6b27f70a78d592866bc7a23674e959641b3e2cb6 Mon Sep 17 00:00:00 2001 From: Brian Foster Date: Mon, 6 May 2019 18:00:28 -0400 Subject: [PATCH] xfs: factor xfs_da3_blkinfo verification into common helper Source kernel commit: 8764f98351fa561296f70c3435a5cb1eb6272c39 With the verifier magic value helper in place, we've left a bit more duplicate code across the verifiers that involve struct xfs_da3_blkinfo. This includes the da node, xattr leaf and dir leaf verifiers, all of which perform similar checks for v4 and v5 filesystems. Create a common helper to verify an xfs_da3_blkinfo structure, taking care to only access v5 fields where appropriate, and refactor the aforementioned verifiers to use the helper. No functional changes. Signed-off-by: Brian Foster Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong Signed-off-by: Eric Sandeen --- libxfs/xfs_attr_leaf.c | 16 ++++----------- libxfs/xfs_da_btree.c | 44 ++++++++++++++++++++++++++++++------------ libxfs/xfs_da_format.h | 3 +++ libxfs/xfs_dir2_leaf.c | 17 ++++------------ 4 files changed, 43 insertions(+), 37 deletions(-) diff --git a/libxfs/xfs_attr_leaf.c b/libxfs/xfs_attr_leaf.c index d0801791d..ae6c0042a 100644 --- a/libxfs/xfs_attr_leaf.c +++ b/libxfs/xfs_attr_leaf.c @@ -240,22 +240,14 @@ xfs_attr3_leaf_verify( struct xfs_attr_leaf_entry *entries; uint32_t end; /* must be 32bit - see below */ int i; + xfs_failaddr_t fa; xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf); - if (!xfs_verify_magic(bp, leaf->hdr.info.magic)) - return __this_address; - - if (xfs_sb_version_hascrc(&mp->m_sb)) { - struct xfs_da3_node_hdr *hdr3 = bp->b_addr; + fa = xfs_da3_blkinfo_verify(bp, bp->b_addr); + if (fa) + return fa; - if (!uuid_equal(&hdr3->info.uuid, &mp->m_sb.sb_meta_uuid)) - return __this_address; - if (be64_to_cpu(hdr3->info.blkno) != bp->b_bn) - return __this_address; - if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->info.lsn))) - return __this_address; - } /* * In recovery there is a transient state where count == 0 is valid * because we may have transitioned an empty shortform attr to a leaf diff --git a/libxfs/xfs_da_btree.c b/libxfs/xfs_da_btree.c index cb419d1e0..eb45b774b 100644 --- a/libxfs/xfs_da_btree.c +++ b/libxfs/xfs_da_btree.c @@ -111,6 +111,34 @@ xfs_da_state_free(xfs_da_state_t *state) kmem_zone_free(xfs_da_state_zone, state); } +/* + * Verify an xfs_da3_blkinfo structure. Note that the da3 fields are only + * accessible on v5 filesystems. This header format is common across da node, + * attr leaf and dir leaf blocks. + */ +xfs_failaddr_t +xfs_da3_blkinfo_verify( + struct xfs_buf *bp, + struct xfs_da3_blkinfo *hdr3) +{ + struct xfs_mount *mp = bp->b_target->bt_mount; + struct xfs_da_blkinfo *hdr = &hdr3->hdr; + + if (!xfs_verify_magic(bp, hdr->magic)) + return __this_address; + + if (xfs_sb_version_hascrc(&mp->m_sb)) { + if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_meta_uuid)) + return __this_address; + if (be64_to_cpu(hdr3->blkno) != bp->b_bn) + return __this_address; + if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->lsn))) + return __this_address; + } + + return 0; +} + static xfs_failaddr_t xfs_da3_node_verify( struct xfs_buf *bp) @@ -119,24 +147,16 @@ xfs_da3_node_verify( struct xfs_da_intnode *hdr = bp->b_addr; struct xfs_da3_icnode_hdr ichdr; const struct xfs_dir_ops *ops; + xfs_failaddr_t fa; ops = xfs_dir_get_ops(mp, NULL); ops->node_hdr_from_disk(&ichdr, hdr); - if (!xfs_verify_magic(bp, hdr->hdr.info.magic)) - return __this_address; + fa = xfs_da3_blkinfo_verify(bp, bp->b_addr); + if (fa) + return fa; - if (xfs_sb_version_hascrc(&mp->m_sb)) { - struct xfs_da3_node_hdr *hdr3 = bp->b_addr; - - if (!uuid_equal(&hdr3->info.uuid, &mp->m_sb.sb_meta_uuid)) - return __this_address; - if (be64_to_cpu(hdr3->info.blkno) != bp->b_bn) - return __this_address; - if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->info.lsn))) - return __this_address; - } if (ichdr.level == 0) return __this_address; if (ichdr.level > XFS_DA_NODE_MAXDEPTH) diff --git a/libxfs/xfs_da_format.h b/libxfs/xfs_da_format.h index 5d5bf3bff..ae654e06b 100644 --- a/libxfs/xfs_da_format.h +++ b/libxfs/xfs_da_format.h @@ -869,4 +869,7 @@ static inline unsigned int xfs_dir2_dirblock_bytes(struct xfs_sb *sbp) return 1 << (sbp->sb_blocklog + sbp->sb_dirblklog); } +xfs_failaddr_t xfs_da3_blkinfo_verify(struct xfs_buf *bp, + struct xfs_da3_blkinfo *hdr3); + #endif /* __XFS_DA_FORMAT_H__ */ diff --git a/libxfs/xfs_dir2_leaf.c b/libxfs/xfs_dir2_leaf.c index cd55ed51c..d7e8ccefe 100644 --- a/libxfs/xfs_dir2_leaf.c +++ b/libxfs/xfs_dir2_leaf.c @@ -143,20 +143,11 @@ xfs_dir3_leaf_verify( { struct xfs_mount *mp = bp->b_target->bt_mount; struct xfs_dir2_leaf *leaf = bp->b_addr; + xfs_failaddr_t fa; - if (!xfs_verify_magic(bp, leaf->hdr.info.magic)) - return __this_address; - - if (xfs_sb_version_hascrc(&mp->m_sb)) { - struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr; - - if (!uuid_equal(&leaf3->info.uuid, &mp->m_sb.sb_meta_uuid)) - return __this_address; - if (be64_to_cpu(leaf3->info.blkno) != bp->b_bn) - return __this_address; - if (!xfs_log_check_lsn(mp, be64_to_cpu(leaf3->info.lsn))) - return __this_address; - } + fa = xfs_da3_blkinfo_verify(bp, bp->b_addr); + if (fa) + return fa; return xfs_dir3_leaf_check_int(mp, NULL, NULL, leaf); } -- 2.47.2