e2fsck: add support for expanding the inode size

[tools/e2fsprogs.git] / lib / ext2fs / ext2_ext_attr.h

diff --git a/lib/ext2fs/ext2_ext_attr.h b/lib/ext2fs/ext2_ext_attr.h
index 85ad490..6d85b14 100644 (file)
--- a/lib/ext2fs/ext2_ext_attr.h
+++ b/lib/ext2fs/ext2_ext_attr.h
@@ -6,6 +6,8 @@
   (C) 2000 Andreas Gruenbacher, <a.gruenbacher@computer.org>
 */
 
+#ifndef _EXT2_EXT_ATTR_H
+#define _EXT2_EXT_ATTR_H
 /* Magic value in attribute blocks */
 #define EXT2_EXT_ATTR_MAGIC_v1         0xEA010000
 #define EXT2_EXT_ATTR_MAGIC            0xEA020000
@@ -18,23 +20,49 @@ struct ext2_ext_attr_header {
        __u32   h_refcount;     /* reference count */
        __u32   h_blocks;       /* number of disk blocks used */
        __u32   h_hash;         /* hash value of all attributes */
-       __u32   h_reserved[4];  /* zero right now */
+       __u32   h_checksum;     /* crc32c(uuid+id+xattrs) */
+                               /* id = inum if refcount = 1, else blknum */
+       __u32   h_reserved[3];  /* zero right now */
 };
 
 struct ext2_ext_attr_entry {
        __u8    e_name_len;     /* length of name */
        __u8    e_name_index;   /* attribute name index */
        __u16   e_value_offs;   /* offset in disk block of value */
-       __u32   e_value_block;  /* disk block attribute is stored on (n/i) */
+       __u32   e_value_inum;   /* inode in which the value is stored */
        __u32   e_value_size;   /* size of attribute value */
        __u32   e_hash;         /* hash value of name and value */
-#if 0
+#if 1
        char    e_name[0];      /* attribute name */
 #endif
 };
 
+#define BHDR(block) ((struct ext2_ext_attr_header *)block)
+#define IHDR(inode) ((__u32 *)((char *)inode + EXT2_GOOD_OLD_INODE_SIZE + \
+                               (inode)->i_extra_isize))
+#define ENTRY(ptr) ((struct ext2_ext_attr_entry *)(ptr))
+
+/* Name indexes */
+#define EXT2_ATTR_INDEX_USER                   1
+#define EXT2_ATTR_INDEX_POSIX_ACL_ACCESS       2
+#define EXT2_ATTR_INDEX_POSIX_ACL_DEFAULT      3
+#define EXT2_ATTR_INDEX_TRUSTED                        4
+#define EXT2_ATTR_INDEX_LUSTRE                 5
+#define EXT2_ATTR_INDEX_SECURITY               6
+#define EXT2_ATTR_INDEX_MAX                    7
+
+#define EXT2_ATTR_INDEX_USER_PREFIX             "user."
+#define EXT2_ATTR_INDEX_POSIX_ACL_ACCESS_PREFIX         "system.posix_acl_access"
+#define EXT2_ATTR_INDEX_POSIX_ACL_DEFAULT_PREFIX "system.posix_acl_default"
+#define EXT2_ATTR_INDEX_TRUSTED_PREFIX          "trusted."
+#define EXT2_ATTR_INDEX_LUSTRE_PREFIX           "lustre."
+#define EXT2_ATTR_INDEX_SECURITY_PREFIX                 "security."
+
+#define EXT2_ATTR_PREFIX(index) (index ## _PREFIX)
+#define EXT2_ATTR_PREFIX_LEN(index) (index ## _PRE_LEN)
+
 #define EXT2_EXT_ATTR_PAD_BITS         2
-#define EXT2_EXT_ATTR_PAD              (1<<EXT2_EXT_ATTR_PAD_BITS)
+#define EXT2_EXT_ATTR_PAD              ((unsigned) 1<<EXT2_EXT_ATTR_PAD_BITS)
 #define EXT2_EXT_ATTR_ROUND            (EXT2_EXT_ATTR_PAD-1)
 #define EXT2_EXT_ATTR_LEN(name_len) \
        (((name_len) + EXT2_EXT_ATTR_ROUND + \
@@ -47,6 +75,22 @@ struct ext2_ext_attr_entry {
 #define EXT2_EXT_IS_LAST_ENTRY(entry) (*((__u32 *)(entry)) == 0UL)
 #define EXT2_EXT_ATTR_NAME(entry) \
        (((char *) (entry)) + sizeof(struct ext2_ext_attr_entry))
+#define EXT2_XATTR_LEN(name_len) \
+       (((name_len) + EXT2_EXT_ATTR_ROUND + \
+       sizeof(struct ext2_xattr_entry)) & ~EXT2_EXT_ATTR_ROUND)
+#define EXT2_XATTR_SIZE(size) \
+       (((size) + EXT2_EXT_ATTR_ROUND) & ~EXT2_EXT_ATTR_ROUND)
+
+/*
+ * XATTR_SIZE_MAX is currently 64k, but for the purposes of checking
+ * for file system consistency errors, we use a somewhat bigger value.
+ * This allows XATTR_SIZE_MAX to grow in the future, but by using this
+ * instead of INT_MAX for certain consistency checks, we don't need to
+ * worry about arithmetic overflows.  (Actually XATTR_SIZE_MAX is
+ * defined in include/uapi/linux/limits.h, so changing it is going
+ * not going to be trivial....)
+ */
+#define EXT2_XATTR_SIZE_MAX (1 << 24)
 
 #ifdef __KERNEL__
 # ifdef CONFIG_EXT2_FS_EXT_ATTR
@@ -61,4 +105,4 @@ extern void ext2_ext_attr_done(void);
 #  define ext2_set_ext_attr NULL
 # endif
 #endif  /* __KERNEL__ */
-
+#endif  /* _EXT2_EXT_ATTR_H */