Merged changes in ext2_fs.h between Linux 1.2.2 and Linux 2.3.35. The

main changes are:
- many things are more dynamic; e.g., the inode size is a new parameter
  in the superblock instead of a constant.
- extensions are controlled by new flags in the superblock.
- directory entries may have a file type field.
These changes are not used yet, except for a spelling change which affects
ext2_cnv.c

2 files changed, 172 insertions, 50 deletions

diff --git a/sys/gnu/ext2fs/ext2_fs.h b/sys/gnu/ext2fs/ext2_fs.h
index 448c8b5..c7262e9 100644
--- a/sys/gnu/ext2fs/ext2_fs.h
+++ b/sys/gnu/ext2fs/ext2_fs.h
@@ -61,30 +61,16 @@
 #undef EXT2FS_DEBUG
 
 /*
- * Define EXT2FS_DEBUG_CACHE to produce cache debug messages
- */
-#undef EXT2FS_DEBUG_CACHE
-
-/*
- * Define EXT2FS_CHECK_CACHE to add some checks to the name cache code
- */
-#undef EXT2FS_CHECK_CACHE
-
-/*
- * Define EXT2FS_PRE_02B_COMPAT to convert ext 2 fs prior to 0.2b
- */
-#undef EXT2FS_PRE_02B_COMPAT
-
-/*
  * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
  */
 #define EXT2_PREALLOCATE
+#define EXT2_DEFAULT_PREALLOC_BLOCKS	8
 
 /*
  * The second extended file system version
  */
-#define EXT2FS_DATE		"95/03/19"
-#define EXT2FS_VERSION		"0.5a"
+#define EXT2FS_DATE		"95/08/09"
+#define EXT2FS_VERSION		"0.5b"
 
 /*
  * Debug code
@@ -108,12 +94,16 @@
 #define EXT2_ACL_DATA_INO	 4	/* ACL inode */
 #define EXT2_BOOT_LOADER_INO	 5	/* Boot loader inode */
 #define EXT2_UNDEL_DIR_INO	 6	/* Undelete directory inode */
-#define EXT2_FIRST_INO		11	/* First non reserved inode */
+
+/* First non-reserved inode for old ext2 filesystems */
+#define EXT2_GOOD_OLD_FIRST_INO	11
 
 /*
  * The second extended file system magic number
  */
+#ifndef notyet
 #define EXT2_PRE_02B_MAGIC	0xEF51
+#endif
 #define EXT2_SUPER_MAGIC	0xEF53
 
 /*
@@ -142,18 +132,29 @@
 #define EXT2_ACLE_PER_BLOCK(s)		(EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry))
 #define	EXT2_ADDR_PER_BLOCK(s)		(EXT2_BLOCK_SIZE(s) / sizeof (__u32))
 #ifdef __KERNEL__
-# define EXT2_BLOCK_SIZE_BITS(s)	((s)->u.ext2_sb.s_es->s_log_block_size + 10)
+# define EXT2_BLOCK_SIZE_BITS(s)	((s)->s_blocksize_bits)
 #else
 # define EXT2_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)
 #endif
-#if defined(__FreeBSD__) && defined(_KERNEL)
-#define	EXT2_INODES_PER_BLOCK(s)	((s)->s_inodes_per_block)
+#ifdef notyet
+#ifdef __KERNEL__
+#define	EXT2_ADDR_PER_BLOCK_BITS(s)	((s)->u.ext2_sb.s_addr_per_block_bits)
+#define EXT2_INODE_SIZE(s)		((s)->u.ext2_sb.s_inode_size)
+#define EXT2_FIRST_INO(s)		((s)->u.ext2_sb.s_first_ino)
 #else
-#define	EXT2_INODES_PER_BLOCK(s)	(EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_inode))
+#define EXT2_INODE_SIZE(s)	(((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
+				 EXT2_GOOD_OLD_INODE_SIZE : \
+				 (s)->s_inode_size)
+#define EXT2_FIRST_INO(s)	(((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
+				 EXT2_GOOD_OLD_FIRST_INO : \
+				 (s)->s_first_ino)
 #endif
-
+#else /* !notyet */
+#define	EXT2_INODES_PER_BLOCK(s)	((s)->s_inodes_per_block)
 /* Should be sizeof(struct ext2_inode): */
 #define EXT2_INODE_SIZE			128
+#define EXT2_FIRST_INO			11
+#endif /* notyet */
 
 /*
  * Macro-instructions used to manage fragments
@@ -198,15 +199,6 @@ struct ext2_acl_entry	/* Access Control List Entry */
 /*
  * Structure of a blocks group descriptor
  */
-struct ext2_old_group_desc
-{
-	__u32	bg_block_bitmap;		/* Blocks bitmap block */
-	__u32	bg_inode_bitmap;		/* Inodes bitmap block */
-	__u32	bg_inode_table;		/* Inodes table block */
-	__u16	bg_free_blocks_count;	/* Free blocks count */
-	__u16	bg_free_inodes_count;	/* Free inodes count */
-};
-
 struct ext2_group_desc
 {
 	__u32	bg_block_bitmap;		/* Blocks bitmap block */
@@ -226,6 +218,7 @@ struct ext2_group_desc
 # define EXT2_BLOCKS_PER_GROUP(s)	((s)->u.ext2_sb.s_blocks_per_group)
 # define EXT2_DESC_PER_BLOCK(s)		((s)->u.ext2_sb.s_desc_per_block)
 # define EXT2_INODES_PER_GROUP(s)	((s)->u.ext2_sb.s_inodes_per_group)
+# define EXT2_DESC_PER_BLOCK_BITS(s)	((s)->u.ext2_sb.s_desc_per_block_bits)
 #else
 # define EXT2_BLOCKS_PER_GROUP(s)	((s)->s_blocks_per_group)
 # define EXT2_DESC_PER_BLOCK(s)		(EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
@@ -252,6 +245,18 @@ struct ext2_group_desc
 #define EXT2_IMMUTABLE_FL		0x00000010 /* Immutable file */
 #define EXT2_APPEND_FL			0x00000020 /* writes to file may only append */
 #define EXT2_NODUMP_FL			0x00000040 /* do not dump file */
+#define EXT2_NOATIME_FL			0x00000080 /* do not update atime */
+/* Reserved for compression usage... */
+#define EXT2_DIRTY_FL			0x00000100
+#define EXT2_COMPRBLK_FL		0x00000200 /* One or more compressed clusters */
+#define EXT2_NOCOMP_FL			0x00000400 /* Don't compress */
+#define EXT2_ECOMPR_FL			0x00000800 /* Compression error */
+/* End compression flags --- maybe not all used */	
+#define EXT2_BTREE_FL			0x00001000 /* btree format dir */
+#define EXT2_RESERVED_FL		0x80000000 /* reserved for ext2 lib */
+
+#define EXT2_FL_USER_VISIBLE		0x00001FFF /* User visible flags */
+#define EXT2_FL_USER_MODIFIABLE		0x000000FF /* User modifiable flags */
 
 /*
  * ioctl commands
@@ -273,17 +278,17 @@ struct ext2_group_desc
  * Structure of an inode on the disk
  */
 struct ext2_inode {
-	__u16 i_mode;		/* File mode */
-	__u16 i_uid;		/* Owner Uid */
-	__u32  i_size;		/* Size in bytes */
-	__u32  i_atime;		/* Access time */
-	__u32  i_ctime;		/* Creation time */
-	__u32  i_mtime;		/* Modification time */
-	__u32  i_dtime;		/* Deletion Time */
-	__u16 i_gid;		/* Group Id */
-	__u16 i_links_count;	/* Links count */
-	__u32  i_blocks;	/* Blocks count */
-	__u32  i_flags;		/* File flags */
+	__u16	i_mode;		/* File mode */
+	__u16	i_uid;		/* Owner Uid */
+	__u32	i_size;		/* Size in bytes */
+	__u32	i_atime;	/* Access time */
+	__u32	i_ctime;	/* Creation time */
+	__u32	i_mtime;	/* Modification time */
+	__u32	i_dtime;	/* Deletion Time */
+	__u16	i_gid;		/* Group Id */
+	__u16	i_links_count;	/* Links count */
+	__u32	i_blocks;	/* Blocks count */
+	__u32	i_flags;	/* File flags */
 	union {
 		struct {
 			__u32  l_i_reserved1;
@@ -296,10 +301,10 @@ struct ext2_inode {
 		} masix1;
 	} osd1;				/* OS dependent 1 */
 	__u32	i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
-	__u32	i_version;	/* File version (for NFS) */
+	__u32	i_generation;	/* File version (for NFS) */
 	__u32	i_file_acl;	/* File ACL */
 	__u32	i_dir_acl;	/* Directory ACL */
-	__u32	i_faddr;		/* Fragment address */
+	__u32	i_faddr;	/* Fragment address */
 	union {
 		struct {
 			__u8	l_i_frag;	/* Fragment number */
@@ -324,6 +329,8 @@ struct ext2_inode {
 	} osd2;				/* OS dependent 2 */
 };
 
+#define i_size_high	i_dir_acl
+
 #if defined(__KERNEL__) || defined(__linux__)
 #define i_reserved1	osd1.linux1.l_i_reserved1
 #define i_frag		osd2.linux2.l_i_frag
@@ -409,22 +416,108 @@ struct ext2_super_block {
 	__u16	s_magic;		/* Magic signature */
 	__u16	s_state;		/* File system state */
 	__u16	s_errors;		/* Behaviour when detecting errors */
-	__u16	s_pad;
+	__u16	s_minor_rev_level; 	/* minor revision level */
 	__u32	s_lastcheck;		/* time of last check */
 	__u32	s_checkinterval;	/* max. time between checks */
 	__u32	s_creator_os;		/* OS */
 	__u32	s_rev_level;		/* Revision level */
 	__u16	s_def_resuid;		/* Default uid for reserved blocks */
 	__u16	s_def_resgid;		/* Default gid for reserved blocks */
-	__u32	s_reserved[235];	/* Padding to the end of the block */
+	/*
+	 * These fields are for EXT2_DYNAMIC_REV superblocks only.
+	 *
+	 * Note: the difference between the compatible feature set and
+	 * the incompatible feature set is that if there is a bit set
+	 * in the incompatible feature set that the kernel doesn't
+	 * know about, it should refuse to mount the filesystem.
+	 * 
+	 * e2fsck's requirements are more strict; if it doesn't know
+	 * about a feature in either the compatible or incompatible
+	 * feature set, it must abort and not try to meddle with
+	 * things it doesn't understand...
+	 */
+	__u32	s_first_ino; 		/* First non-reserved inode */
+	__u16   s_inode_size; 		/* size of inode structure */
+	__u16	s_block_group_nr; 	/* block group # of this superblock */
+	__u32	s_feature_compat; 	/* compatible feature set */
+	__u32	s_feature_incompat; 	/* incompatible feature set */
+	__u32	s_feature_ro_compat; 	/* readonly-compatible feature set */
+	__u8	s_uuid[16];		/* 128-bit uuid for volume */
+	char	s_volume_name[16]; 	/* volume name */
+	char	s_last_mounted[64]; 	/* directory where last mounted */
+	__u32	s_algorithm_usage_bitmap; /* For compression */
+	/*
+	 * Performance hints.  Directory preallocation should only
+	 * happen if the EXT2_COMPAT_PREALLOC flag is on.
+	 */
+	__u8	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
+	__u8	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
+	__u16	s_padding1;
+	__u32	s_reserved[204];	/* Padding to the end of the block */
 };
 
+#ifdef __KERNEL__
+#define EXT2_SB(sb)	(&((sb)->u.ext2_sb))
+#else
+/* Assume that user mode programs are passing in an ext2fs superblock, not
+ * a kernel struct super_block.  This will allow us to call the feature-test
+ * macros from user land. */
+#define EXT2_SB(sb)	(sb)
+#endif
+
+/*
+ * Codes for operating systems
+ */
 #define EXT2_OS_LINUX		0
 #define EXT2_OS_HURD		1
 #define EXT2_OS_MASIX		2
+#define EXT2_OS_FREEBSD		3
+#define EXT2_OS_LITES		4
+
+/*
+ * Revision levels
+ */
+#define EXT2_GOOD_OLD_REV	0	/* The good old (original) format */
+#define EXT2_DYNAMIC_REV	1 	/* V2 format w/ dynamic inode sizes */
+
+#define EXT2_CURRENT_REV	EXT2_GOOD_OLD_REV
+#define EXT2_MAX_SUPP_REV	EXT2_DYNAMIC_REV
+
+#define EXT2_GOOD_OLD_INODE_SIZE 128
 
-#define EXT2_CURRENT_REV	0
+/*
+ * Feature set definitions
+ */
+
+#define EXT2_HAS_COMPAT_FEATURE(sb,mask)			\
+	( EXT2_SB(sb)->s_feature_compat & (mask) )
+#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)			\
+	( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
+#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)			\
+	( EXT2_SB(sb)->s_feature_incompat & (mask) )
+
+#define EXT2_FEATURE_COMPAT_DIR_PREALLOC	0x0001
 
+#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001
+#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
+#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR	0x0004
+
+#define EXT2_FEATURE_INCOMPAT_COMPRESSION	0x0001
+#define EXT2_FEATURE_INCOMPAT_FILETYPE		0x0002
+
+#define EXT2_FEATURE_COMPAT_SUPP	0
+#define EXT2_FEATURE_INCOMPAT_SUPP	EXT2_FEATURE_INCOMPAT_FILETYPE
+#ifdef notyet
+#define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
+					 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
+					 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
+#else
+#define EXT2_FEATURE_RO_COMPAT_SUPP	0
+#endif
+
+/*
+ * Default values for user and/or group using reserved blocks
+ */
 #define	EXT2_DEF_RESUID		0
 #define	EXT2_DEF_RESGID		0
 
@@ -441,6 +534,35 @@ struct ext2_dir_entry {
 };
 
 /*
+ * The new version of the directory entry.  Since EXT2 structures are
+ * stored in intel byte order, and the name_len field could never be
+ * bigger than 255 chars, it's safe to reclaim the extra byte for the
+ * file_type field.
+ */
+struct ext2_dir_entry_2 {
+	__u32	inode;			/* Inode number */
+	__u16	rec_len;		/* Directory entry length */
+	__u8	name_len;		/* Name length */
+	__u8	file_type;
+	char	name[EXT2_NAME_LEN];	/* File name */
+};
+
+/*
+ * Ext2 directory file types.  Only the low 3 bits are used.  The
+ * other bits are reserved for now.
+ */
+#define EXT2_FT_UNKNOWN		0
+#define EXT2_FT_REG_FILE	1
+#define EXT2_FT_DIR		2
+#define EXT2_FT_CHRDEV		3
+#define EXT2_FT_BLKDEV 		4
+#define EXT2_FT_FIFO		5
+#define EXT2_FT_SOCK		6
+#define EXT2_FT_SYMLINK		7
+
+#define EXT2_FT_MAX		8
+
+/*
  * EXT2_DIR_PAD defines the directory entries boundaries
  *
  * NOTE: It must be a multiple of 4
diff --git a/sys/gnu/ext2fs/ext2_inode_cnv.c b/sys/gnu/ext2fs/ext2_inode_cnv.c
index ab8ceb1..3e8e0ff 100644
--- a/sys/gnu/ext2fs/ext2_inode_cnv.c
+++ b/sys/gnu/ext2fs/ext2_inode_cnv.c
@@ -112,7 +112,7 @@ ext2_ei2di(ei, di)
         di->di_flags    |= (ei->i_flags & EXT2_APPEND_FL) ? APPEND : 0;
         di->di_flags    |= (ei->i_flags & EXT2_IMMUTABLE_FL) ? IMMUTABLE : 0;
         di->di_blocks   = ei->i_blocks;
-        di->di_gen      = ei->i_version;        /* XXX is that true ??? */
+        di->di_gen      = ei->i_generation;
         di->di_uid      = ei->i_uid;
         di->di_gid      = ei->i_gid;
 	/* XXX use memcpy */
@@ -149,7 +149,7 @@ ext2_di2ei(di, ei)
         ei->i_flags    		|= (di->di_flags & IMMUTABLE) 
 							? EXT2_IMMUTABLE_FL: 0;
         ei->i_blocks            = di->di_blocks;
-        ei->i_version           = di->di_gen;   /* XXX is that true ??? */
+        ei->i_generation        = di->di_gen;
         ei->i_uid               = di->di_uid;
         ei->i_gid               = di->di_gid;
 	/* XXX use memcpy */