Reserve the EXT4_INCOMPAT_EA_INODE feature flag

Reserve the EXT4_INCOMPAT_EA_INODE feature flag for use with
large extended attributes that are stored in a separate inode.
This changes the on-disk format in several ways:

First, replace the e_value_block field with e_value_inum, so that
an xattr entry can reference an external inode.  This field is
currently unused, as all of the entries live in the same block.

struct ext2_ext_attr_entry {
 	__u8	e_name_len;	/* length of name */
 	__u8	e_name_index;	/* attribute name index */
 	__le16	e_value_offs;	/* offset in disk block of value */
>	__le32	e_value_inum;	/* inode in which the value is stored */
 	__le32	e_value_size;	/* size of attribute value */
 	__le32	e_hash;		/* hash value of name and value */
 	char	e_name[0];	/* attribute name */
}

Second, add a flag to the inode that indicates it is using a large
(external) extended attribute.  This is needed so that when unlinking
an inode the xattrs will be scanned to unlink the xattr inodes
referenced by the main inode.

Third, for inodes that have a number of xattrs that are larger than
a single block, but not large enough to justify an external inode
(less than 64kB total xattr size, due to e_value_offs limitation)
the ext2_ext_attr_header->h_blocks field can grow beyond a single
block to represent a contiguous allocation of blocks for the xattr.

Signed-off-by: Andreas Dilger <adilger@sun.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index b022d48..12d8ead 100644 (file)
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -273,6 +273,7 @@ struct ext2_dx_countlimit {
 #define EXT2_TOPDIR_FL                 0x00020000 /* Top of directory hierarchies*/
 #define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 #define EXT4_EXTENTS_FL                0x00080000 /* Inode uses extents */
+#define EXT4_EA_INODE_FL               0x00200000 /* Inode used for large EA */
 #define EXT4_EOFBLOCKS_FL              0x00400000 /* Blocks allocated beyond EOF */
 #define EXT2_RESERVED_FL               0x80000000 /* reserved for ext2 lib */
 
@@ -645,6 +646,7 @@ struct ext2_super_block {
 #define EXT4_FEATURE_INCOMPAT_64BIT            0x0080
 #define EXT4_FEATURE_INCOMPAT_MMP              0x0100
 #define EXT4_FEATURE_INCOMPAT_FLEX_BG          0x0200
+#define EXT4_FEATURE_INCOMPAT_EA_INODE         0x0400
 
 
 #define EXT2_FEATURE_COMPAT_SUPP       0