Currently, we depends on Linux XATTR value for on disk
definitions. Which causes trouble on other platforms and
maybe also if this value was to change.
Fix it by creating a custom definition independent from
those in Linux (although with the same values), so it is OK
with the be16 fields used for holding these attributes.
Signed-off-by: Jan Tulak <jtulak@xxxxxxxxxx>
---
libxfs/xfs_attr_remote.c | 2 +-
libxfs/xfs_format.h | 10 +++++++++-
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/libxfs/xfs_attr_remote.c b/libxfs/xfs_attr_remote.c
index 3b3c24b..39ab350 100644
--- a/libxfs/xfs_attr_remote.c
+++ b/libxfs/xfs_attr_remote.c
@@ -102,7 +102,7 @@ xfs_attr3_rmt_verify(
if (be32_to_cpu(rmt->rm_bytes) > fsbsize - sizeof(*rmt))
return false;
if (be32_to_cpu(rmt->rm_offset) +
- be32_to_cpu(rmt->rm_bytes) > XATTR_SIZE_MAX)
+ be32_to_cpu(rmt->rm_bytes) > XFS_XATTR_SIZE_MAX)
return false;
if (rmt->rm_owner == 0)
return false;
diff --git a/libxfs/xfs_format.h b/libxfs/xfs_format.h
index 3c98635..946bcd1 100644
--- a/libxfs/xfs_format.h
+++ b/libxfs/xfs_format.h
@@ -60,6 +60,14 @@ struct xfs_ifork;
#define XFS_SB_VERSION_MOREBITSBIT 0x8000
/*
+ * The size of a single extended attribute on disk is limited by
+ * the size of index values within the attribute entries themselves.
+ * These are be16 fields, so we can only support attribute data
+ * sizes up to 2^16 bytes in length.
+ */
+#define XFS_XATTR_SIZE_MAX (1 << 16)
+
+/*
* Supported feature bit list is just all bits in the versionnum field because
* we've used them all up and understand them all. Except, of course, for the
* shared superblock bit, which nobody knows what it does and so is unsupported.
@@ -1483,7 +1491,7 @@ struct xfs_acl {
*/
#define XFS_ACL_MAX_ENTRIES(mp) \
(xfs_sb_version_hascrc(&mp->m_sb) \
- ? (XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
+ ? (XFS_XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
sizeof(struct xfs_acl_entry) \
: 25)
--
2.4.3
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