[PATCH v3 2/9] xfs: always check magic values in on-disk byte order

Brian Foster
2019-02-04T14:52:33Z

Most verifiers that check on-disk magic values convert the CPU
endian magic value constant to disk endian to facilitate compile
time optimization of the byte swap and reduce the need for runtime
byte swaps in buffer verifiers. Several buffer verifiers do not
follow this pattern. Update those verifiers for consistency.

Also fix up a random typo in the inode readahead verifier name.

Signed-off-by: Brian Foster <bfoster@redhat.com>
---
fs/xfs/libxfs/xfs_alloc.c | 2 +-
fs/xfs/libxfs/xfs_attr_leaf.c | 4 ++--
fs/xfs/libxfs/xfs_da_btree.c | 4 ++--
fs/xfs/libxfs/xfs_inode_buf.c | 2 +-
fs/xfs/libxfs/xfs_sb.c | 3 ++-
5 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
index b715668886a4..48aab07e7138 100644
--- a/fs/xfs/libxfs/xfs_alloc.c
+++ b/fs/xfs/libxfs/xfs_alloc.c
@@ -570,7 +570,7 @@ xfs_agfl_verify(

if (!uuid_equal(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid))
return __this_address;
- if (be32_to_cpu(agfl->agfl_magicnum) != XFS_AGFL_MAGIC)
+ if (agfl->agfl_magicnum != cpu_to_be32(XFS_AGFL_MAGIC))
return __this_address;
/*
* during growfs operations, the perag is not fully initialised,
diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c
index 2652d00842d6..e60eba7f129c 100644
--- a/fs/xfs/libxfs/xfs_attr_leaf.c
+++ b/fs/xfs/libxfs/xfs_attr_leaf.c
@@ -251,7 +251,7 @@ xfs_attr3_leaf_verify(
if (xfs_sb_version_hascrc(&mp->m_sb)) {
struct xfs_da3_node_hdr *hdr3 = bp->b_addr;

- if (ichdr.magic != XFS_ATTR3_LEAF_MAGIC)
+ if (hdr3->info.hdr.magic != cpu_to_be16(XFS_ATTR3_LEAF_MAGIC))
return __this_address;

if (!uuid_equal(&hdr3->info.uuid, &mp->m_sb.sb_meta_uuid))
@@ -261,7 +261,7 @@ xfs_attr3_leaf_verify(
if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->info.lsn)))
return __this_address;
} else {
- if (ichdr.magic != XFS_ATTR_LEAF_MAGIC)
+ if (leaf->hdr.info.magic != cpu_to_be16(XFS_ATTR_LEAF_MAGIC))
return __this_address;
}
/*
diff --git a/fs/xfs/libxfs/xfs_da_btree.c b/fs/xfs/libxfs/xfs_da_btree.c
index 376bee94b5dd..355322688c9f 100644
--- a/fs/xfs/libxfs/xfs_da_btree.c
+++ b/fs/xfs/libxfs/xfs_da_btree.c
@@ -132,7 +132,7 @@ xfs_da3_node_verify(
if (xfs_sb_version_hascrc(&mp->m_sb)) {
struct xfs_da3_node_hdr *hdr3 = bp->b_addr;

- if (ichdr.magic != XFS_DA3_NODE_MAGIC)
+ if (hdr3->info.hdr.magic != cpu_to_be16(XFS_DA3_NODE_MAGIC))
return __this_address;

if (!uuid_equal(&hdr3->info.uuid, &mp->m_sb.sb_meta_uuid))
@@ -142,7 +142,7 @@ xfs_da3_node_verify(
if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->info.lsn)))
return __this_address;
} else {
- if (ichdr.magic != XFS_DA_NODE_MAGIC)
+ if (hdr->hdr.info.magic != cpu_to_be16(XFS_DA_NODE_MAGIC))
return __this_address;
}
if (ichdr.level == 0)
diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
index 09d9c8cfa4a0..fd2df5747a3a 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -152,7 +152,7 @@ const struct xfs_buf_ops xfs_inode_buf_ops = {
};

const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
- .name = "xxfs_inode_ra",
+ .name = "xfs_inode_ra",
.verify_read = xfs_inode_buf_readahead_verify,
.verify_write = xfs_inode_buf_write_verify,
};
diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
index b5a82acd7dfe..a2f52a958091 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -225,10 +225,11 @@ xfs_validate_sb_common(
struct xfs_buf *bp,
struct xfs_sb *sbp)
{
+ struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp);
uint32_t agcount = 0;
uint32_t rem;

- if (sbp->sb_magicnum != XFS_SB_MAGIC) {
+ if (dsb->sb_magicnum != cpu_to_be32(XFS_SB_MAGIC)) {
xfs_warn(mp, "bad magic number");
return -EWRONGFS;
}
--
2.17.2