Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / xfs / xfs_acl.h

diff --git a/fs/xfs/xfs_acl.h b/fs/xfs/xfs_acl.h
index 39632d94135490ac94dee48ff5f037d29d5592ac..4016a567b83cc2e00d46b5f4629bfc83785a7dff 100644 (file)
--- a/fs/xfs/xfs_acl.h
+++ b/fs/xfs/xfs_acl.h
@@ -22,19 +22,36 @@ struct inode;
 struct posix_acl;
 struct xfs_inode;
 
-#define XFS_ACL_MAX_ENTRIES 25
 #define XFS_ACL_NOT_PRESENT (-1)
 
 /* On-disk XFS access control list structure */
+struct xfs_acl_entry {
+       __be32  ae_tag;
+       __be32  ae_id;
+       __be16  ae_perm;
+       __be16  ae_pad;         /* fill the implicit hole in the structure */
+};
+
 struct xfs_acl {
-       __be32          acl_cnt;
-       struct xfs_acl_entry {
-               __be32  ae_tag;
-               __be32  ae_id;
-               __be16  ae_perm;
-       } acl_entry[XFS_ACL_MAX_ENTRIES];
+       __be32                  acl_cnt;
+       struct xfs_acl_entry    acl_entry[0];
 };
 
+/*
+ * The number of ACL entries allowed is defined by the on-disk format.
+ * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is
+ * limited only by the maximum size of the xattr that stores the information.
+ */
+#define XFS_ACL_MAX_ENTRIES(mp)        \
+       (xfs_sb_version_hascrc(&mp->m_sb) \
+               ?  (XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
+                                               sizeof(struct xfs_acl_entry) \
+               : 25)
+
+#define XFS_ACL_MAX_SIZE(mp) \
+       (sizeof(struct xfs_acl) + \
+               sizeof(struct xfs_acl_entry) * XFS_ACL_MAX_ENTRIES((mp)))
+
 /* On-disk XFS extended attribute names */
 #define SGI_ACL_FILE           (unsigned char *)"SGI_ACL_FILE"
 #define SGI_ACL_DEFAULT                (unsigned char *)"SGI_ACL_DEFAULT"