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/filesystems/unixfs/common/linux/kernel/include/linux/ext2_fs.h

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  1/*
  2 *  linux/include/linux/ext2_fs.h
  3 *
  4 * Copyright (C) 1992, 1993, 1994, 1995
  5 * Remy Card (card@masi.ibp.fr)
  6 * Laboratoire MASI - Institut Blaise Pascal
  7 * Universite Pierre et Marie Curie (Paris VI)
  8 *
  9 *  from
 10 *
 11 *  linux/include/linux/minix_fs.h
 12 *
 13 *  Copyright (C) 1991, 1992  Linus Torvalds
 14 */
 15
 16#ifndef _LINUX_EXT2_FS_H
 17#define _LINUX_EXT2_FS_H
 18
 19#include <linux/types.h>
 20#include <linux/magic.h>
 21
 22/*
 23 * The second extended filesystem constants/structures
 24 */
 25
 26/*
 27 * Define EXT2FS_DEBUG to produce debug messages
 28 */
 29#undef EXT2FS_DEBUG
 30
 31/*
 32 * Define EXT2_RESERVATION to reserve data blocks for expanding files
 33 */
 34#define EXT2_DEFAULT_RESERVE_BLOCKS     8
 35/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
 36#define EXT2_MAX_RESERVE_BLOCKS         1027
 37#define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
 38/*
 39 * The second extended file system version
 40 */
 41#define EXT2FS_DATE		"95/08/09"
 42#define EXT2FS_VERSION		"0.5b"
 43
 44/*
 45 * Debug code
 46 */
 47#ifdef EXT2FS_DEBUG
 48#	define ext2_debug(f, a...)	{ \
 49					printk ("EXT2-fs DEBUG (%s, %d): %s:", \
 50						__FILE__, __LINE__, __FUNCTION__); \
 51				  	printk (f, ## a); \
 52					}
 53#else
 54#	define ext2_debug(f, a...)	/**/
 55#endif
 56
 57/*
 58 * Special inode numbers
 59 */
 60#define	EXT2_BAD_INO		 1	/* Bad blocks inode */
 61#define EXT2_ROOT_INO		 2	/* Root inode */
 62#define EXT2_BOOT_LOADER_INO	 5	/* Boot loader inode */
 63#define EXT2_UNDEL_DIR_INO	 6	/* Undelete directory inode */
 64
 65/* First non-reserved inode for old ext2 filesystems */
 66#define EXT2_GOOD_OLD_FIRST_INO	11
 67
 68#ifdef __KERNEL__
 69#include <linux/ext2_fs_sb.h>
 70static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
 71{
 72	return sb->s_fs_info;
 73}
 74#else
 75/* Assume that user mode programs are passing in an ext2fs superblock, not
 76 * a kernel struct super_block.  This will allow us to call the feature-test
 77 * macros from user land. */
 78#define EXT2_SB(sb)	(sb)
 79#endif
 80
 81/*
 82 * Maximal count of links to a file
 83 */
 84#define EXT2_LINK_MAX		32000
 85
 86/*
 87 * Macro-instructions used to manage several block sizes
 88 */
 89#define EXT2_MIN_BLOCK_SIZE		1024
 90#define	EXT2_MAX_BLOCK_SIZE		4096
 91#define EXT2_MIN_BLOCK_LOG_SIZE		  10
 92#ifdef __KERNEL__
 93# define EXT2_BLOCK_SIZE(s)		((s)->s_blocksize)
 94#else
 95# define EXT2_BLOCK_SIZE(s)		(EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 96#endif
 97#define	EXT2_ADDR_PER_BLOCK(s)		(EXT2_BLOCK_SIZE(s) / sizeof (__u32))
 98#ifdef __KERNEL__
 99# define EXT2_BLOCK_SIZE_BITS(s)	((s)->s_blocksize_bits)
100#else
101# define EXT2_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)
102#endif
103#ifdef __KERNEL__
104#define	EXT2_ADDR_PER_BLOCK_BITS(s)	(EXT2_SB(s)->s_addr_per_block_bits)
105#define EXT2_INODE_SIZE(s)		(EXT2_SB(s)->s_inode_size)
106#define EXT2_FIRST_INO(s)		(EXT2_SB(s)->s_first_ino)
107#else
108#define EXT2_INODE_SIZE(s)	(((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
109				 EXT2_GOOD_OLD_INODE_SIZE : \
110				 (s)->s_inode_size)
111#define EXT2_FIRST_INO(s)	(((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
112				 EXT2_GOOD_OLD_FIRST_INO : \
113				 (s)->s_first_ino)
114#endif
115
116/*
117 * Macro-instructions used to manage fragments
118 */
119#define EXT2_MIN_FRAG_SIZE		1024
120#define	EXT2_MAX_FRAG_SIZE		4096
121#define EXT2_MIN_FRAG_LOG_SIZE		  10
122#ifdef __KERNEL__
123# define EXT2_FRAG_SIZE(s)		(EXT2_SB(s)->s_frag_size)
124# define EXT2_FRAGS_PER_BLOCK(s)	(EXT2_SB(s)->s_frags_per_block)
125#else
126# define EXT2_FRAG_SIZE(s)		(EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
127# define EXT2_FRAGS_PER_BLOCK(s)	(EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
128#endif
129
130/*
131 * Structure of a blocks group descriptor
132 */
133struct ext2_group_desc
134{
135	__le32	bg_block_bitmap;		/* Blocks bitmap block */
136	__le32	bg_inode_bitmap;		/* Inodes bitmap block */
137	__le32	bg_inode_table;		/* Inodes table block */
138	__le16	bg_free_blocks_count;	/* Free blocks count */
139	__le16	bg_free_inodes_count;	/* Free inodes count */
140	__le16	bg_used_dirs_count;	/* Directories count */
141	__le16	bg_pad;
142	__le32	bg_reserved[3];
143};
144
145/*
146 * Macro-instructions used to manage group descriptors
147 */
148#ifdef __KERNEL__
149# define EXT2_BLOCKS_PER_GROUP(s)	(EXT2_SB(s)->s_blocks_per_group)
150# define EXT2_DESC_PER_BLOCK(s)		(EXT2_SB(s)->s_desc_per_block)
151# define EXT2_INODES_PER_GROUP(s)	(EXT2_SB(s)->s_inodes_per_group)
152# define EXT2_DESC_PER_BLOCK_BITS(s)	(EXT2_SB(s)->s_desc_per_block_bits)
153#else
154# define EXT2_BLOCKS_PER_GROUP(s)	((s)->s_blocks_per_group)
155# define EXT2_DESC_PER_BLOCK(s)		(EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
156# define EXT2_INODES_PER_GROUP(s)	((s)->s_inodes_per_group)
157#endif
158
159/*
160 * Constants relative to the data blocks
161 */
162#define	EXT2_NDIR_BLOCKS		12
163#define	EXT2_IND_BLOCK			EXT2_NDIR_BLOCKS
164#define	EXT2_DIND_BLOCK			(EXT2_IND_BLOCK + 1)
165#define	EXT2_TIND_BLOCK			(EXT2_DIND_BLOCK + 1)
166#define	EXT2_N_BLOCKS			(EXT2_TIND_BLOCK + 1)
167
168/*
169 * Inode flags (GETFLAGS/SETFLAGS)
170 */
171#define	EXT2_SECRM_FL			FS_SECRM_FL	/* Secure deletion */
172#define	EXT2_UNRM_FL			FS_UNRM_FL	/* Undelete */
173#define	EXT2_COMPR_FL			FS_COMPR_FL	/* Compress file */
174#define EXT2_SYNC_FL			FS_SYNC_FL	/* Synchronous updates */
175#define EXT2_IMMUTABLE_FL		FS_IMMUTABLE_FL	/* Immutable file */
176#define EXT2_APPEND_FL			FS_APPEND_FL	/* writes to file may only append */
177#define EXT2_NODUMP_FL			FS_NODUMP_FL	/* do not dump file */
178#define EXT2_NOATIME_FL			FS_NOATIME_FL	/* do not update atime */
179/* Reserved for compression usage... */
180#define EXT2_DIRTY_FL			FS_DIRTY_FL
181#define EXT2_COMPRBLK_FL		FS_COMPRBLK_FL	/* One or more compressed clusters */
182#define EXT2_NOCOMP_FL			FS_NOCOMP_FL	/* Don't compress */
183#define EXT2_ECOMPR_FL			FS_ECOMPR_FL	/* Compression error */
184/* End compression flags --- maybe not all used */	
185#define EXT2_BTREE_FL			FS_BTREE_FL	/* btree format dir */
186#define EXT2_INDEX_FL			FS_INDEX_FL	/* hash-indexed directory */
187#define EXT2_IMAGIC_FL			FS_IMAGIC_FL	/* AFS directory */
188#define EXT2_JOURNAL_DATA_FL		FS_JOURNAL_DATA_FL /* Reserved for ext3 */
189#define EXT2_NOTAIL_FL			FS_NOTAIL_FL	/* file tail should not be merged */
190#define EXT2_DIRSYNC_FL			FS_DIRSYNC_FL	/* dirsync behaviour (directories only) */
191#define EXT2_TOPDIR_FL			FS_TOPDIR_FL	/* Top of directory hierarchies*/
192#define EXT2_RESERVED_FL		FS_RESERVED_FL	/* reserved for ext2 lib */
193
194#define EXT2_FL_USER_VISIBLE		FS_FL_USER_VISIBLE	/* User visible flags */
195#define EXT2_FL_USER_MODIFIABLE		FS_FL_USER_MODIFIABLE	/* User modifiable flags */
196
197/*
198 * ioctl commands
199 */
200#define	EXT2_IOC_GETFLAGS		FS_IOC_GETFLAGS
201#define	EXT2_IOC_SETFLAGS		FS_IOC_SETFLAGS
202#define	EXT2_IOC_GETVERSION		FS_IOC_GETVERSION
203#define	EXT2_IOC_SETVERSION		FS_IOC_SETVERSION
204#define	EXT2_IOC_GETRSVSZ		_IOR('f', 5, long)
205#define	EXT2_IOC_SETRSVSZ		_IOW('f', 6, long)
206
207/*
208 * ioctl commands in 32 bit emulation
209 */
210#define EXT2_IOC32_GETFLAGS		FS_IOC32_GETFLAGS
211#define EXT2_IOC32_SETFLAGS		FS_IOC32_SETFLAGS
212#define EXT2_IOC32_GETVERSION		FS_IOC32_GETVERSION
213#define EXT2_IOC32_SETVERSION		FS_IOC32_SETVERSION
214
215/*
216 * Structure of an inode on the disk
217 */
218struct ext2_inode {
219	__le16	i_mode;		/* File mode */
220	__le16	i_uid;		/* Low 16 bits of Owner Uid */
221	__le32	i_size;		/* Size in bytes */
222	__le32	i_atime;	/* Access time */
223	__le32	i_ctime;	/* Creation time */
224	__le32	i_mtime;	/* Modification time */
225	__le32	i_dtime;	/* Deletion Time */
226	__le16	i_gid;		/* Low 16 bits of Group Id */
227	__le16	i_links_count;	/* Links count */
228	__le32	i_blocks;	/* Blocks count */
229	__le32	i_flags;	/* File flags */
230	union {
231		struct {
232			__le32  l_i_reserved1;
233		} linux1;
234		struct {
235			__le32  h_i_translator;
236		} hurd1;
237		struct {
238			__le32  m_i_reserved1;
239		} masix1;
240	} osd1;				/* OS dependent 1 */
241	__le32	i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
242	__le32	i_generation;	/* File version (for NFS) */
243	__le32	i_file_acl;	/* File ACL */
244	__le32	i_dir_acl;	/* Directory ACL */
245	__le32	i_faddr;	/* Fragment address */
246	union {
247		struct {
248			__u8	l_i_frag;	/* Fragment number */
249			__u8	l_i_fsize;	/* Fragment size */
250			__u16	i_pad1;
251			__le16	l_i_uid_high;	/* these 2 fields    */
252			__le16	l_i_gid_high;	/* were reserved2[0] */
253			__u32	l_i_reserved2;
254		} linux2;
255		struct {
256			__u8	h_i_frag;	/* Fragment number */
257			__u8	h_i_fsize;	/* Fragment size */
258			__le16	h_i_mode_high;
259			__le16	h_i_uid_high;
260			__le16	h_i_gid_high;
261			__le32	h_i_author;
262		} hurd2;
263		struct {
264			__u8	m_i_frag;	/* Fragment number */
265			__u8	m_i_fsize;	/* Fragment size */
266			__u16	m_pad1;
267			__u32	m_i_reserved2[2];
268		} masix2;
269	} osd2;				/* OS dependent 2 */
270};
271
272#define i_size_high	i_dir_acl
273
274#if defined(__KERNEL__) || defined(__linux__)
275#define i_reserved1	osd1.linux1.l_i_reserved1
276#define i_frag		osd2.linux2.l_i_frag
277#define i_fsize		osd2.linux2.l_i_fsize
278#define i_uid_low	i_uid
279#define i_gid_low	i_gid
280#define i_uid_high	osd2.linux2.l_i_uid_high
281#define i_gid_high	osd2.linux2.l_i_gid_high
282#define i_reserved2	osd2.linux2.l_i_reserved2
283#endif
284
285#ifdef	__hurd__
286#define i_translator	osd1.hurd1.h_i_translator
287#define i_frag		osd2.hurd2.h_i_frag
288#define i_fsize		osd2.hurd2.h_i_fsize
289#define i_uid_high	osd2.hurd2.h_i_uid_high
290#define i_gid_high	osd2.hurd2.h_i_gid_high
291#define i_author	osd2.hurd2.h_i_author
292#endif
293
294#ifdef	__masix__
295#define i_reserved1	osd1.masix1.m_i_reserved1
296#define i_frag		osd2.masix2.m_i_frag
297#define i_fsize		osd2.masix2.m_i_fsize
298#define i_reserved2	osd2.masix2.m_i_reserved2
299#endif
300
301/*
302 * File system states
303 */
304#define	EXT2_VALID_FS			0x0001	/* Unmounted cleanly */
305#define	EXT2_ERROR_FS			0x0002	/* Errors detected */
306
307/*
308 * Mount flags
309 */
310#define EXT2_MOUNT_CHECK		0x000001  /* Do mount-time checks */
311#define EXT2_MOUNT_OLDALLOC		0x000002  /* Don't use the new Orlov allocator */
312#define EXT2_MOUNT_GRPID		0x000004  /* Create files with directory's group */
313#define EXT2_MOUNT_DEBUG		0x000008  /* Some debugging messages */
314#define EXT2_MOUNT_ERRORS_CONT		0x000010  /* Continue on errors */
315#define EXT2_MOUNT_ERRORS_RO		0x000020  /* Remount fs ro on errors */
316#define EXT2_MOUNT_ERRORS_PANIC		0x000040  /* Panic on errors */
317#define EXT2_MOUNT_MINIX_DF		0x000080  /* Mimics the Minix statfs */
318#define EXT2_MOUNT_NOBH			0x000100  /* No buffer_heads */
319#define EXT2_MOUNT_NO_UID32		0x000200  /* Disable 32-bit UIDs */
320#define EXT2_MOUNT_XATTR_USER		0x004000  /* Extended user attributes */
321#define EXT2_MOUNT_POSIX_ACL		0x008000  /* POSIX Access Control Lists */
322#define EXT2_MOUNT_XIP			0x010000  /* Execute in place */
323#define EXT2_MOUNT_USRQUOTA		0x020000  /* user quota */
324#define EXT2_MOUNT_GRPQUOTA		0x040000  /* group quota */
325#define EXT2_MOUNT_RESERVATION		0x080000  /* Preallocation */
326
327
328#define clear_opt(o, opt)		o &= ~EXT2_MOUNT_##opt
329#define set_opt(o, opt)			o |= EXT2_MOUNT_##opt
330#define test_opt(sb, opt)		(EXT2_SB(sb)->s_mount_opt & \
331					 EXT2_MOUNT_##opt)
332/*
333 * Maximal mount counts between two filesystem checks
334 */
335#define EXT2_DFL_MAX_MNT_COUNT		20	/* Allow 20 mounts */
336#define EXT2_DFL_CHECKINTERVAL		0	/* Don't use interval check */
337
338/*
339 * Behaviour when detecting errors
340 */
341#define EXT2_ERRORS_CONTINUE		1	/* Continue execution */
342#define EXT2_ERRORS_RO			2	/* Remount fs read-only */
343#define EXT2_ERRORS_PANIC		3	/* Panic */
344#define EXT2_ERRORS_DEFAULT		EXT2_ERRORS_CONTINUE
345
346/*
347 * Structure of the super block
348 */
349struct ext2_super_block {
350	__le32	s_inodes_count;		/* Inodes count */
351	__le32	s_blocks_count;		/* Blocks count */
352	__le32	s_r_blocks_count;	/* Reserved blocks count */
353	__le32	s_free_blocks_count;	/* Free blocks count */
354	__le32	s_free_inodes_count;	/* Free inodes count */
355	__le32	s_first_data_block;	/* First Data Block */
356	__le32	s_log_block_size;	/* Block size */
357	__le32	s_log_frag_size;	/* Fragment size */
358	__le32	s_blocks_per_group;	/* # Blocks per group */
359	__le32	s_frags_per_group;	/* # Fragments per group */
360	__le32	s_inodes_per_group;	/* # Inodes per group */
361	__le32	s_mtime;		/* Mount time */
362	__le32	s_wtime;		/* Write time */
363	__le16	s_mnt_count;		/* Mount count */
364	__le16	s_max_mnt_count;	/* Maximal mount count */
365	__le16	s_magic;		/* Magic signature */
366	__le16	s_state;		/* File system state */
367	__le16	s_errors;		/* Behaviour when detecting errors */
368	__le16	s_minor_rev_level; 	/* minor revision level */
369	__le32	s_lastcheck;		/* time of last check */
370	__le32	s_checkinterval;	/* max. time between checks */
371	__le32	s_creator_os;		/* OS */
372	__le32	s_rev_level;		/* Revision level */
373	__le16	s_def_resuid;		/* Default uid for reserved blocks */
374	__le16	s_def_resgid;		/* Default gid for reserved blocks */
375	/*
376	 * These fields are for EXT2_DYNAMIC_REV superblocks only.
377	 *
378	 * Note: the difference between the compatible feature set and
379	 * the incompatible feature set is that if there is a bit set
380	 * in the incompatible feature set that the kernel doesn't
381	 * know about, it should refuse to mount the filesystem.
382	 * 
383	 * e2fsck's requirements are more strict; if it doesn't know
384	 * about a feature in either the compatible or incompatible
385	 * feature set, it must abort and not try to meddle with
386	 * things it doesn't understand...
387	 */
388	__le32	s_first_ino; 		/* First non-reserved inode */
389	__le16   s_inode_size; 		/* size of inode structure */
390	__le16	s_block_group_nr; 	/* block group # of this superblock */
391	__le32	s_feature_compat; 	/* compatible feature set */
392	__le32	s_feature_incompat; 	/* incompatible feature set */
393	__le32	s_feature_ro_compat; 	/* readonly-compatible feature set */
394	__u8	s_uuid[16];		/* 128-bit uuid for volume */
395	char	s_volume_name[16]; 	/* volume name */
396	char	s_last_mounted[64]; 	/* directory where last mounted */
397	__le32	s_algorithm_usage_bitmap; /* For compression */
398	/*
399	 * Performance hints.  Directory preallocation should only
400	 * happen if the EXT2_COMPAT_PREALLOC flag is on.
401	 */
402	__u8	s_prealloc_blocks;	/* Nr of blocks to try to preallocate*/
403	__u8	s_prealloc_dir_blocks;	/* Nr to preallocate for dirs */
404	__u16	s_padding1;
405	/*
406	 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
407	 */
408	__u8	s_journal_uuid[16];	/* uuid of journal superblock */
409	__u32	s_journal_inum;		/* inode number of journal file */
410	__u32	s_journal_dev;		/* device number of journal file */
411	__u32	s_last_orphan;		/* start of list of inodes to delete */
412	__u32	s_hash_seed[4];		/* HTREE hash seed */
413	__u8	s_def_hash_version;	/* Default hash version to use */
414	__u8	s_reserved_char_pad;
415	__u16	s_reserved_word_pad;
416	__le32	s_default_mount_opts;
417 	__le32	s_first_meta_bg; 	/* First metablock block group */
418	__u32	s_reserved[190];	/* Padding to the end of the block */
419};
420
421/*
422 * Codes for operating systems
423 */
424#define EXT2_OS_LINUX		0
425#define EXT2_OS_HURD		1
426#define EXT2_OS_MASIX		2
427#define EXT2_OS_FREEBSD		3
428#define EXT2_OS_LITES		4
429
430/*
431 * Revision levels
432 */
433#define EXT2_GOOD_OLD_REV	0	/* The good old (original) format */
434#define EXT2_DYNAMIC_REV	1 	/* V2 format w/ dynamic inode sizes */
435
436#define EXT2_CURRENT_REV	EXT2_GOOD_OLD_REV
437#define EXT2_MAX_SUPP_REV	EXT2_DYNAMIC_REV
438
439#define EXT2_GOOD_OLD_INODE_SIZE 128
440
441/*
442 * Feature set definitions
443 */
444
445#define EXT2_HAS_COMPAT_FEATURE(sb,mask)			\
446	( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
447#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)			\
448	( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
449#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)			\
450	( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
451#define EXT2_SET_COMPAT_FEATURE(sb,mask)			\
452	EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
453#define EXT2_SET_RO_COMPAT_FEATURE(sb,mask)			\
454	EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
455#define EXT2_SET_INCOMPAT_FEATURE(sb,mask)			\
456	EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
457#define EXT2_CLEAR_COMPAT_FEATURE(sb,mask)			\
458	EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
459#define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask)			\
460	EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
461#define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask)			\
462	EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
463
464#define EXT2_FEATURE_COMPAT_DIR_PREALLOC	0x0001
465#define EXT2_FEATURE_COMPAT_IMAGIC_INODES	0x0002
466#define EXT3_FEATURE_COMPAT_HAS_JOURNAL		0x0004
467#define EXT2_FEATURE_COMPAT_EXT_ATTR		0x0008
468#define EXT2_FEATURE_COMPAT_RESIZE_INO		0x0010
469#define EXT2_FEATURE_COMPAT_DIR_INDEX		0x0020
470#define EXT2_FEATURE_COMPAT_ANY			0xffffffff
471
472#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER	0x0001
473#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE	0x0002
474#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR	0x0004
475#define EXT2_FEATURE_RO_COMPAT_ANY		0xffffffff
476
477#define EXT2_FEATURE_INCOMPAT_COMPRESSION	0x0001
478#define EXT2_FEATURE_INCOMPAT_FILETYPE		0x0002
479#define EXT3_FEATURE_INCOMPAT_RECOVER		0x0004
480#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV	0x0008
481#define EXT2_FEATURE_INCOMPAT_META_BG		0x0010
482#define EXT2_FEATURE_INCOMPAT_ANY		0xffffffff
483
484#define EXT2_FEATURE_COMPAT_SUPP	EXT2_FEATURE_COMPAT_EXT_ATTR
485#define EXT2_FEATURE_INCOMPAT_SUPP	(EXT2_FEATURE_INCOMPAT_FILETYPE| \
486					 EXT2_FEATURE_INCOMPAT_META_BG)
487#define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
488					 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
489					 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
490#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED	~EXT2_FEATURE_RO_COMPAT_SUPP
491#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED	~EXT2_FEATURE_INCOMPAT_SUPP
492
493/*
494 * Default values for user and/or group using reserved blocks
495 */
496#define	EXT2_DEF_RESUID		0
497#define	EXT2_DEF_RESGID		0
498
499/*
500 * Default mount options
501 */
502#define EXT2_DEFM_DEBUG		0x0001
503#define EXT2_DEFM_BSDGROUPS	0x0002
504#define EXT2_DEFM_XATTR_USER	0x0004
505#define EXT2_DEFM_ACL		0x0008
506#define EXT2_DEFM_UID16		0x0010
507    /* Not used by ext2, but reserved for use by ext3 */
508#define EXT3_DEFM_JMODE		0x0060 
509#define EXT3_DEFM_JMODE_DATA	0x0020
510#define EXT3_DEFM_JMODE_ORDERED	0x0040
511#define EXT3_DEFM_JMODE_WBACK	0x0060
512
513/*
514 * Structure of a directory entry
515 */
516#define EXT2_NAME_LEN 255
517
518struct ext2_dir_entry {
519	__le32	inode;			/* Inode number */
520	__le16	rec_len;		/* Directory entry length */
521	__le16	name_len;		/* Name length */
522	char	name[EXT2_NAME_LEN];	/* File name */
523};
524
525/*
526 * The new version of the directory entry.  Since EXT2 structures are
527 * stored in intel byte order, and the name_len field could never be
528 * bigger than 255 chars, it's safe to reclaim the extra byte for the
529 * file_type field.
530 */
531struct ext2_dir_entry_2 {
532	__le32	inode;			/* Inode number */
533	__le16	rec_len;		/* Directory entry length */
534	__u8	name_len;		/* Name length */
535	__u8	file_type;
536	char	name[EXT2_NAME_LEN];	/* File name */
537};
538
539/*
540 * Ext2 directory file types.  Only the low 3 bits are used.  The
541 * other bits are reserved for now.
542 */
543enum {
544	EXT2_FT_UNKNOWN,
545	EXT2_FT_REG_FILE,
546	EXT2_FT_DIR,
547	EXT2_FT_CHRDEV,
548	EXT2_FT_BLKDEV,
549	EXT2_FT_FIFO,
550	EXT2_FT_SOCK,
551	EXT2_FT_SYMLINK,
552	EXT2_FT_MAX
553};
554
555/*
556 * EXT2_DIR_PAD defines the directory entries boundaries
557 *
558 * NOTE: It must be a multiple of 4
559 */
560#define EXT2_DIR_PAD		 	4
561#define EXT2_DIR_ROUND 			(EXT2_DIR_PAD - 1)
562#define EXT2_DIR_REC_LEN(name_len)	(((name_len) + 8 + EXT2_DIR_ROUND) & \
563					 ~EXT2_DIR_ROUND)
564#define EXT2_MAX_REC_LEN		((1<<16)-1)
565
566#endif	/* _LINUX_EXT2_FS_H */