blob: 8e5009ee4ad83bb9efcbda4a5f56ae0da73a6921 [file] [log] [blame]
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Mingming Cao617ba132006-10-11 01:20:53 -07002 * linux/include/linux/ext4_fs.h
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 *
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
Mingming Cao617ba132006-10-11 01:20:53 -070016#ifndef _LINUX_EXT4_FS_H
17#define _LINUX_EXT4_FS_H
Dave Kleikampac27a0e2006-10-11 01:20:50 -070018
19#include <linux/types.h>
Mingming Cao3a5b2ec2006-10-11 01:21:05 -070020#include <linux/blkdev.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070021#include <linux/magic.h>
22
23/*
24 * The second extended filesystem constants/structures
25 */
26
27/*
Mingming Cao617ba132006-10-11 01:20:53 -070028 * Define EXT4FS_DEBUG to produce debug messages
Dave Kleikampac27a0e2006-10-11 01:20:50 -070029 */
Mingming Cao617ba132006-10-11 01:20:53 -070030#undef EXT4FS_DEBUG
Dave Kleikampac27a0e2006-10-11 01:20:50 -070031
32/*
Mingming Cao617ba132006-10-11 01:20:53 -070033 * Define EXT4_RESERVATION to reserve data blocks for expanding files
Dave Kleikampac27a0e2006-10-11 01:20:50 -070034 */
Mingming Cao617ba132006-10-11 01:20:53 -070035#define EXT4_DEFAULT_RESERVE_BLOCKS 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -070036/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
Mingming Cao617ba132006-10-11 01:20:53 -070037#define EXT4_MAX_RESERVE_BLOCKS 1027
38#define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -070039/*
40 * Always enable hashed directories
41 */
Mingming Cao617ba132006-10-11 01:20:53 -070042#define CONFIG_EXT4_INDEX
Dave Kleikampac27a0e2006-10-11 01:20:50 -070043
44/*
45 * Debug code
46 */
Mingming Cao617ba132006-10-11 01:20:53 -070047#ifdef EXT4FS_DEBUG
48#define ext4_debug(f, a...) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070049 do { \
Mingming Cao617ba132006-10-11 01:20:53 -070050 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070051 __FILE__, __LINE__, __FUNCTION__); \
52 printk (KERN_DEBUG f, ## a); \
53 } while (0)
54#else
Mingming Cao617ba132006-10-11 01:20:53 -070055#define ext4_debug(f, a...) do {} while (0)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070056#endif
57
58/*
59 * Special inodes numbers
60 */
Mingming Cao617ba132006-10-11 01:20:53 -070061#define EXT4_BAD_INO 1 /* Bad blocks inode */
62#define EXT4_ROOT_INO 2 /* Root inode */
63#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
64#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
65#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
66#define EXT4_JOURNAL_INO 8 /* Journal inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -070067
Mingming Cao617ba132006-10-11 01:20:53 -070068/* First non-reserved inode for old ext4 filesystems */
69#define EXT4_GOOD_OLD_FIRST_INO 11
Dave Kleikampac27a0e2006-10-11 01:20:50 -070070
71/*
72 * Maximal count of links to a file
73 */
Mingming Cao617ba132006-10-11 01:20:53 -070074#define EXT4_LINK_MAX 32000
Dave Kleikampac27a0e2006-10-11 01:20:50 -070075
76/*
77 * Macro-instructions used to manage several block sizes
78 */
Mingming Cao617ba132006-10-11 01:20:53 -070079#define EXT4_MIN_BLOCK_SIZE 1024
80#define EXT4_MAX_BLOCK_SIZE 4096
81#define EXT4_MIN_BLOCK_LOG_SIZE 10
Dave Kleikampac27a0e2006-10-11 01:20:50 -070082#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -070083# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070084#else
Mingming Cao617ba132006-10-11 01:20:53 -070085# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070086#endif
Mingming Cao617ba132006-10-11 01:20:53 -070087#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
Dave Kleikampac27a0e2006-10-11 01:20:50 -070088#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -070089# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070090#else
Mingming Cao617ba132006-10-11 01:20:53 -070091# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070092#endif
93#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -070094#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
95#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
96#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070097#else
Mingming Cao617ba132006-10-11 01:20:53 -070098#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
99 EXT4_GOOD_OLD_INODE_SIZE : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700100 (s)->s_inode_size)
Mingming Cao617ba132006-10-11 01:20:53 -0700101#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
102 EXT4_GOOD_OLD_FIRST_INO : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700103 (s)->s_first_ino)
104#endif
105
106/*
107 * Macro-instructions used to manage fragments
108 */
Mingming Cao617ba132006-10-11 01:20:53 -0700109#define EXT4_MIN_FRAG_SIZE 1024
110#define EXT4_MAX_FRAG_SIZE 4096
111#define EXT4_MIN_FRAG_LOG_SIZE 10
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700112#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700113# define EXT4_FRAG_SIZE(s) (EXT4_SB(s)->s_frag_size)
114# define EXT4_FRAGS_PER_BLOCK(s) (EXT4_SB(s)->s_frags_per_block)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700115#else
Mingming Cao617ba132006-10-11 01:20:53 -0700116# define EXT4_FRAG_SIZE(s) (EXT4_MIN_FRAG_SIZE << (s)->s_log_frag_size)
117# define EXT4_FRAGS_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_FRAG_SIZE(s))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700118#endif
119
120/*
121 * Structure of a blocks group descriptor
122 */
Mingming Cao617ba132006-10-11 01:20:53 -0700123struct ext4_group_desc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700124{
125 __le32 bg_block_bitmap; /* Blocks bitmap block */
126 __le32 bg_inode_bitmap; /* Inodes bitmap block */
127 __le32 bg_inode_table; /* Inodes table block */
128 __le16 bg_free_blocks_count; /* Free blocks count */
129 __le16 bg_free_inodes_count; /* Free inodes count */
130 __le16 bg_used_dirs_count; /* Directories count */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700131 __u16 bg_flags;
132 __le16 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
133 __le16 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
134 __le16 bg_inode_table_hi; /* Inodes table block MSB */
135 __u16 bg_reserved[3];
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700136};
137
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700138#ifdef __KERNEL__
139#include <linux/ext4_fs_i.h>
140#include <linux/ext4_fs_sb.h>
141#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700142/*
143 * Macro-instructions used to manage group descriptors
144 */
145#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700146# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
147# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
148# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
149# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700150#else
Mingming Cao617ba132006-10-11 01:20:53 -0700151# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
152# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (struct ext4_group_desc))
153# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700154#endif
155
156/*
157 * Constants relative to the data blocks
158 */
Mingming Cao617ba132006-10-11 01:20:53 -0700159#define EXT4_NDIR_BLOCKS 12
160#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
161#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
162#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
163#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700164
165/*
166 * Inode flags
167 */
Mingming Cao617ba132006-10-11 01:20:53 -0700168#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
169#define EXT4_UNRM_FL 0x00000002 /* Undelete */
170#define EXT4_COMPR_FL 0x00000004 /* Compress file */
171#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
172#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
173#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
174#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
175#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700176/* Reserved for compression usage... */
Mingming Cao617ba132006-10-11 01:20:53 -0700177#define EXT4_DIRTY_FL 0x00000100
178#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
179#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
180#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700181/* End compression flags --- maybe not all used */
Mingming Cao617ba132006-10-11 01:20:53 -0700182#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
183#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
184#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
185#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
186#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
187#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
188#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
Alex Tomasa86c6182006-10-11 01:21:03 -0700189#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700190
Alex Tomasa86c6182006-10-11 01:21:03 -0700191#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
Mingming Cao617ba132006-10-11 01:20:53 -0700192#define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700193
194/*
195 * Inode dynamic state flags
196 */
Mingming Cao617ba132006-10-11 01:20:53 -0700197#define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
198#define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
199#define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700200
201/* Used to pass group descriptor data when online resize is done */
Mingming Cao617ba132006-10-11 01:20:53 -0700202struct ext4_new_group_input {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700203 __u32 group; /* Group number for this data */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700204 __u64 block_bitmap; /* Absolute block number of block bitmap */
205 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
206 __u64 inode_table; /* Absolute block number of inode table start */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700207 __u32 blocks_count; /* Total number of blocks in this group */
208 __u16 reserved_blocks; /* Number of reserved blocks in this group */
209 __u16 unused;
210};
211
Mingming Cao617ba132006-10-11 01:20:53 -0700212/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
213struct ext4_new_group_data {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700214 __u32 group;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700215 __u64 block_bitmap;
216 __u64 inode_bitmap;
217 __u64 inode_table;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700218 __u32 blocks_count;
219 __u16 reserved_blocks;
220 __u16 unused;
221 __u32 free_blocks_count;
222};
223
224
225/*
226 * ioctl commands
227 */
Mingming Cao617ba132006-10-11 01:20:53 -0700228#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
229#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
230#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
231#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
232#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
233#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
234#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
235#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700236#ifdef CONFIG_JBD_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700237#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700238#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700239#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
240#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700241
242/*
243 * ioctl commands in 32 bit emulation
244 */
Mingming Cao617ba132006-10-11 01:20:53 -0700245#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
246#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
247#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
248#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
249#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
250#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
251#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700252#ifdef CONFIG_JBD_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700253#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700254#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700255#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
256#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700257
258
259/*
260 * Mount options
261 */
Mingming Cao617ba132006-10-11 01:20:53 -0700262struct ext4_mount_options {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700263 unsigned long s_mount_opt;
264 uid_t s_resuid;
265 gid_t s_resgid;
266 unsigned long s_commit_interval;
267#ifdef CONFIG_QUOTA
268 int s_jquota_fmt;
269 char *s_qf_names[MAXQUOTAS];
270#endif
271};
272
273/*
274 * Structure of an inode on the disk
275 */
Mingming Cao617ba132006-10-11 01:20:53 -0700276struct ext4_inode {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700277 __le16 i_mode; /* File mode */
278 __le16 i_uid; /* Low 16 bits of Owner Uid */
279 __le32 i_size; /* Size in bytes */
280 __le32 i_atime; /* Access time */
281 __le32 i_ctime; /* Creation time */
282 __le32 i_mtime; /* Modification time */
283 __le32 i_dtime; /* Deletion Time */
284 __le16 i_gid; /* Low 16 bits of Group Id */
285 __le16 i_links_count; /* Links count */
286 __le32 i_blocks; /* Blocks count */
287 __le32 i_flags; /* File flags */
288 union {
289 struct {
290 __u32 l_i_reserved1;
291 } linux1;
292 struct {
293 __u32 h_i_translator;
294 } hurd1;
295 struct {
296 __u32 m_i_reserved1;
297 } masix1;
298 } osd1; /* OS dependent 1 */
Mingming Cao617ba132006-10-11 01:20:53 -0700299 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700300 __le32 i_generation; /* File version (for NFS) */
301 __le32 i_file_acl; /* File ACL */
302 __le32 i_dir_acl; /* Directory ACL */
303 __le32 i_faddr; /* Fragment address */
304 union {
305 struct {
306 __u8 l_i_frag; /* Fragment number */
307 __u8 l_i_fsize; /* Fragment size */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700308 __le16 l_i_file_acl_high;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700309 __le16 l_i_uid_high; /* these 2 fields */
310 __le16 l_i_gid_high; /* were reserved2[0] */
311 __u32 l_i_reserved2;
312 } linux2;
313 struct {
314 __u8 h_i_frag; /* Fragment number */
315 __u8 h_i_fsize; /* Fragment size */
316 __u16 h_i_mode_high;
317 __u16 h_i_uid_high;
318 __u16 h_i_gid_high;
319 __u32 h_i_author;
320 } hurd2;
321 struct {
322 __u8 m_i_frag; /* Fragment number */
323 __u8 m_i_fsize; /* Fragment size */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700324 __le16 m_i_file_acl_high;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700325 __u32 m_i_reserved2[2];
326 } masix2;
327 } osd2; /* OS dependent 2 */
328 __le16 i_extra_isize;
329 __le16 i_pad1;
330};
331
332#define i_size_high i_dir_acl
333
334#if defined(__KERNEL__) || defined(__linux__)
335#define i_reserved1 osd1.linux1.l_i_reserved1
336#define i_frag osd2.linux2.l_i_frag
337#define i_fsize osd2.linux2.l_i_fsize
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700338#define i_file_acl_high osd2.linux2.l_i_file_acl_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700339#define i_uid_low i_uid
340#define i_gid_low i_gid
341#define i_uid_high osd2.linux2.l_i_uid_high
342#define i_gid_high osd2.linux2.l_i_gid_high
343#define i_reserved2 osd2.linux2.l_i_reserved2
344
345#elif defined(__GNU__)
346
347#define i_translator osd1.hurd1.h_i_translator
348#define i_frag osd2.hurd2.h_i_frag;
349#define i_fsize osd2.hurd2.h_i_fsize;
350#define i_uid_high osd2.hurd2.h_i_uid_high
351#define i_gid_high osd2.hurd2.h_i_gid_high
352#define i_author osd2.hurd2.h_i_author
353
354#elif defined(__masix__)
355
356#define i_reserved1 osd1.masix1.m_i_reserved1
357#define i_frag osd2.masix2.m_i_frag
358#define i_fsize osd2.masix2.m_i_fsize
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700359#define i_file_acl_high osd2.masix2.m_i_file_acl_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700360#define i_reserved2 osd2.masix2.m_i_reserved2
361
362#endif /* defined(__KERNEL__) || defined(__linux__) */
363
364/*
365 * File system states
366 */
Mingming Cao617ba132006-10-11 01:20:53 -0700367#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
368#define EXT4_ERROR_FS 0x0002 /* Errors detected */
369#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700370
371/*
372 * Mount flags
373 */
Mingming Cao617ba132006-10-11 01:20:53 -0700374#define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
375#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
376#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
377#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
378#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
379#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
380#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
381#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
382#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
383#define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
384#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
385#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
386#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
387#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
388#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
389#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
390#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
391#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
392#define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
393#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
394#define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
395#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
396#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
397#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
Alex Tomasa86c6182006-10-11 01:21:03 -0700398#define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700399
Mingming Cao617ba132006-10-11 01:20:53 -0700400/* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700401#ifndef _LINUX_EXT2_FS_H
Mingming Cao617ba132006-10-11 01:20:53 -0700402#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
403#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
404#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
405 EXT4_MOUNT_##opt)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700406#else
Mingming Cao617ba132006-10-11 01:20:53 -0700407#define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
408#define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
409#define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700410#endif
411
Mingming Cao617ba132006-10-11 01:20:53 -0700412#define ext4_set_bit ext2_set_bit
413#define ext4_set_bit_atomic ext2_set_bit_atomic
414#define ext4_clear_bit ext2_clear_bit
415#define ext4_clear_bit_atomic ext2_clear_bit_atomic
416#define ext4_test_bit ext2_test_bit
417#define ext4_find_first_zero_bit ext2_find_first_zero_bit
418#define ext4_find_next_zero_bit ext2_find_next_zero_bit
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700419
420/*
421 * Maximal mount counts between two filesystem checks
422 */
Mingming Cao617ba132006-10-11 01:20:53 -0700423#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
424#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700425
426/*
427 * Behaviour when detecting errors
428 */
Mingming Cao617ba132006-10-11 01:20:53 -0700429#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
430#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
431#define EXT4_ERRORS_PANIC 3 /* Panic */
432#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700433
434/*
435 * Structure of the super block
436 */
Mingming Cao617ba132006-10-11 01:20:53 -0700437struct ext4_super_block {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700438/*00*/ __le32 s_inodes_count; /* Inodes count */
439 __le32 s_blocks_count; /* Blocks count */
440 __le32 s_r_blocks_count; /* Reserved blocks count */
441 __le32 s_free_blocks_count; /* Free blocks count */
442/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
443 __le32 s_first_data_block; /* First Data Block */
444 __le32 s_log_block_size; /* Block size */
445 __le32 s_log_frag_size; /* Fragment size */
446/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
447 __le32 s_frags_per_group; /* # Fragments per group */
448 __le32 s_inodes_per_group; /* # Inodes per group */
449 __le32 s_mtime; /* Mount time */
450/*30*/ __le32 s_wtime; /* Write time */
451 __le16 s_mnt_count; /* Mount count */
452 __le16 s_max_mnt_count; /* Maximal mount count */
453 __le16 s_magic; /* Magic signature */
454 __le16 s_state; /* File system state */
455 __le16 s_errors; /* Behaviour when detecting errors */
456 __le16 s_minor_rev_level; /* minor revision level */
457/*40*/ __le32 s_lastcheck; /* time of last check */
458 __le32 s_checkinterval; /* max. time between checks */
459 __le32 s_creator_os; /* OS */
460 __le32 s_rev_level; /* Revision level */
461/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
462 __le16 s_def_resgid; /* Default gid for reserved blocks */
463 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700464 * These fields are for EXT4_DYNAMIC_REV superblocks only.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700465 *
466 * Note: the difference between the compatible feature set and
467 * the incompatible feature set is that if there is a bit set
468 * in the incompatible feature set that the kernel doesn't
469 * know about, it should refuse to mount the filesystem.
470 *
471 * e2fsck's requirements are more strict; if it doesn't know
472 * about a feature in either the compatible or incompatible
473 * feature set, it must abort and not try to meddle with
474 * things it doesn't understand...
475 */
476 __le32 s_first_ino; /* First non-reserved inode */
477 __le16 s_inode_size; /* size of inode structure */
478 __le16 s_block_group_nr; /* block group # of this superblock */
479 __le32 s_feature_compat; /* compatible feature set */
480/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
481 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
482/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
483/*78*/ char s_volume_name[16]; /* volume name */
484/*88*/ char s_last_mounted[64]; /* directory where last mounted */
485/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
486 /*
487 * Performance hints. Directory preallocation should only
Mingming Cao617ba132006-10-11 01:20:53 -0700488 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700489 */
490 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
491 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
492 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
493 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700494 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700495 */
496/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
497/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
498 __le32 s_journal_dev; /* device number of journal file */
499 __le32 s_last_orphan; /* start of list of inodes to delete */
500 __le32 s_hash_seed[4]; /* HTREE hash seed */
501 __u8 s_def_hash_version; /* Default hash version to use */
502 __u8 s_reserved_char_pad;
503 __u16 s_reserved_word_pad;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700504/*100*/ __le32 s_default_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700505 __le32 s_first_meta_bg; /* First metablock block group */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700506 __le32 s_mkfs_time; /* When the filesystem was created */
507 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
508 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
509/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
510 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
511 __le32 s_free_blocks_count_hi; /* Free blocks count */
512 __u32 s_reserved[169]; /* Padding to the end of the block */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700513};
514
515#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700516static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700517{
518 return sb->s_fs_info;
519}
Mingming Cao617ba132006-10-11 01:20:53 -0700520static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700521{
Mingming Cao617ba132006-10-11 01:20:53 -0700522 return container_of(inode, struct ext4_inode_info, vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700523}
524
Mingming Cao617ba132006-10-11 01:20:53 -0700525static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700526{
Mingming Cao617ba132006-10-11 01:20:53 -0700527 return ino == EXT4_ROOT_INO ||
528 ino == EXT4_JOURNAL_INO ||
529 ino == EXT4_RESIZE_INO ||
530 (ino >= EXT4_FIRST_INO(sb) &&
531 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700532}
533#else
Mingming Cao617ba132006-10-11 01:20:53 -0700534/* Assume that user mode programs are passing in an ext4fs superblock, not
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700535 * a kernel struct super_block. This will allow us to call the feature-test
536 * macros from user land. */
Mingming Cao617ba132006-10-11 01:20:53 -0700537#define EXT4_SB(sb) (sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700538#endif
539
Mingming Cao617ba132006-10-11 01:20:53 -0700540#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700541
542/*
543 * Codes for operating systems
544 */
Mingming Cao617ba132006-10-11 01:20:53 -0700545#define EXT4_OS_LINUX 0
546#define EXT4_OS_HURD 1
547#define EXT4_OS_MASIX 2
548#define EXT4_OS_FREEBSD 3
549#define EXT4_OS_LITES 4
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700550
551/*
552 * Revision levels
553 */
Mingming Cao617ba132006-10-11 01:20:53 -0700554#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
555#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700556
Mingming Cao617ba132006-10-11 01:20:53 -0700557#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
558#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700559
Mingming Cao617ba132006-10-11 01:20:53 -0700560#define EXT4_GOOD_OLD_INODE_SIZE 128
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700561
562/*
563 * Feature set definitions
564 */
565
Mingming Cao617ba132006-10-11 01:20:53 -0700566#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
567 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
568#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
569 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
570#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
571 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
572#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
573 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
574#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
575 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
576#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
577 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
578#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
579 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
580#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
581 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
582#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
583 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700584
Mingming Cao617ba132006-10-11 01:20:53 -0700585#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
586#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
587#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
588#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
589#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
590#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700591
Mingming Cao617ba132006-10-11 01:20:53 -0700592#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
593#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
594#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700595
Mingming Cao617ba132006-10-11 01:20:53 -0700596#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
597#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
598#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
599#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
600#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
Alex Tomasa86c6182006-10-11 01:21:03 -0700601#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700602#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700603
Mingming Cao617ba132006-10-11 01:20:53 -0700604#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
605#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
606 EXT4_FEATURE_INCOMPAT_RECOVER| \
Alex Tomasa86c6182006-10-11 01:21:03 -0700607 EXT4_FEATURE_INCOMPAT_META_BG| \
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700608 EXT4_FEATURE_INCOMPAT_EXTENTS| \
609 EXT4_FEATURE_INCOMPAT_64BIT)
Mingming Cao617ba132006-10-11 01:20:53 -0700610#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
611 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
612 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700613
614/*
615 * Default values for user and/or group using reserved blocks
616 */
Mingming Cao617ba132006-10-11 01:20:53 -0700617#define EXT4_DEF_RESUID 0
618#define EXT4_DEF_RESGID 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700619
620/*
621 * Default mount options
622 */
Mingming Cao617ba132006-10-11 01:20:53 -0700623#define EXT4_DEFM_DEBUG 0x0001
624#define EXT4_DEFM_BSDGROUPS 0x0002
625#define EXT4_DEFM_XATTR_USER 0x0004
626#define EXT4_DEFM_ACL 0x0008
627#define EXT4_DEFM_UID16 0x0010
628#define EXT4_DEFM_JMODE 0x0060
629#define EXT4_DEFM_JMODE_DATA 0x0020
630#define EXT4_DEFM_JMODE_ORDERED 0x0040
631#define EXT4_DEFM_JMODE_WBACK 0x0060
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700632
633/*
634 * Structure of a directory entry
635 */
Mingming Cao617ba132006-10-11 01:20:53 -0700636#define EXT4_NAME_LEN 255
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700637
Mingming Cao617ba132006-10-11 01:20:53 -0700638struct ext4_dir_entry {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700639 __le32 inode; /* Inode number */
640 __le16 rec_len; /* Directory entry length */
641 __le16 name_len; /* Name length */
Mingming Cao617ba132006-10-11 01:20:53 -0700642 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700643};
644
645/*
Mingming Cao617ba132006-10-11 01:20:53 -0700646 * The new version of the directory entry. Since EXT4 structures are
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700647 * stored in intel byte order, and the name_len field could never be
648 * bigger than 255 chars, it's safe to reclaim the extra byte for the
649 * file_type field.
650 */
Mingming Cao617ba132006-10-11 01:20:53 -0700651struct ext4_dir_entry_2 {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700652 __le32 inode; /* Inode number */
653 __le16 rec_len; /* Directory entry length */
654 __u8 name_len; /* Name length */
655 __u8 file_type;
Mingming Cao617ba132006-10-11 01:20:53 -0700656 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700657};
658
659/*
Mingming Cao617ba132006-10-11 01:20:53 -0700660 * Ext4 directory file types. Only the low 3 bits are used. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700661 * other bits are reserved for now.
662 */
Mingming Cao617ba132006-10-11 01:20:53 -0700663#define EXT4_FT_UNKNOWN 0
664#define EXT4_FT_REG_FILE 1
665#define EXT4_FT_DIR 2
666#define EXT4_FT_CHRDEV 3
667#define EXT4_FT_BLKDEV 4
668#define EXT4_FT_FIFO 5
669#define EXT4_FT_SOCK 6
670#define EXT4_FT_SYMLINK 7
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700671
Mingming Cao617ba132006-10-11 01:20:53 -0700672#define EXT4_FT_MAX 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700673
674/*
Mingming Cao617ba132006-10-11 01:20:53 -0700675 * EXT4_DIR_PAD defines the directory entries boundaries
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700676 *
677 * NOTE: It must be a multiple of 4
678 */
Mingming Cao617ba132006-10-11 01:20:53 -0700679#define EXT4_DIR_PAD 4
680#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
681#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
682 ~EXT4_DIR_ROUND)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700683/*
684 * Hash Tree Directory indexing
685 * (c) Daniel Phillips, 2001
686 */
687
Mingming Cao617ba132006-10-11 01:20:53 -0700688#ifdef CONFIG_EXT4_INDEX
689 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
690 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
691 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
692#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
693#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700694#else
695 #define is_dx(dir) 0
Mingming Cao617ba132006-10-11 01:20:53 -0700696#define EXT4_DIR_LINK_MAX(dir) ((dir)->i_nlink >= EXT4_LINK_MAX)
697#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700698#endif
699
700/* Legal values for the dx_root hash_version field: */
701
702#define DX_HASH_LEGACY 0
703#define DX_HASH_HALF_MD4 1
704#define DX_HASH_TEA 2
705
706#ifdef __KERNEL__
707
708/* hash info structure used by the directory hash */
709struct dx_hash_info
710{
711 u32 hash;
712 u32 minor_hash;
713 int hash_version;
714 u32 *seed;
715};
716
Mingming Cao617ba132006-10-11 01:20:53 -0700717#define EXT4_HTREE_EOF 0x7fffffff
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700718
719/*
Mingming Cao617ba132006-10-11 01:20:53 -0700720 * Control parameters used by ext4_htree_next_block
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700721 */
722#define HASH_NB_ALWAYS 1
723
724
725/*
726 * Describe an inode's exact location on disk and in memory
727 */
Mingming Cao617ba132006-10-11 01:20:53 -0700728struct ext4_iloc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700729{
730 struct buffer_head *bh;
731 unsigned long offset;
732 unsigned long block_group;
733};
734
Mingming Cao617ba132006-10-11 01:20:53 -0700735static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700736{
Mingming Cao617ba132006-10-11 01:20:53 -0700737 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700738}
739
740/*
741 * This structure is stuffed into the struct file's private_data field
742 * for directories. It is where we put information so that we can do
743 * readdir operations in hash tree order.
744 */
745struct dir_private_info {
746 struct rb_root root;
747 struct rb_node *curr_node;
748 struct fname *extra_fname;
749 loff_t last_pos;
750 __u32 curr_hash;
751 __u32 curr_minor_hash;
752 __u32 next_hash;
753};
754
755/* calculate the first block number of the group */
Mingming Cao617ba132006-10-11 01:20:53 -0700756static inline ext4_fsblk_t
757ext4_group_first_block_no(struct super_block *sb, unsigned long group_no)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700758{
Mingming Cao617ba132006-10-11 01:20:53 -0700759 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
760 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700761}
762
763/*
764 * Special error return code only used by dx_probe() and its callers.
765 */
766#define ERR_BAD_DX_DIR -75000
767
768/*
Mingming Cao3a5b2ec2006-10-11 01:21:05 -0700769 * This function calculate the block group number and offset,
770 * given a block number
771 */
772
773static inline void ext4_get_group_no_and_offset(struct super_block * sb,
774 ext4_fsblk_t blocknr, unsigned long* blockgrpp,
775 ext4_grpblk_t *offsetp)
776{
777 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
778 ext4_grpblk_t offset;
779
780 blocknr = blocknr - le32_to_cpu(es->s_first_data_block);
781 offset = sector_div(blocknr, EXT4_BLOCKS_PER_GROUP(sb));
782 if (offsetp)
783 *offsetp = offset;
784 if (blockgrpp)
785 *blockgrpp = blocknr;
786
787}
788
789/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700790 * Function prototypes
791 */
792
793/*
794 * Ok, these declarations are also in <linux/kernel.h> but none of the
Mingming Cao617ba132006-10-11 01:20:53 -0700795 * ext4 source programs needs to include it so they are duplicated here.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700796 */
797# define NORET_TYPE /**/
798# define ATTRIB_NORET __attribute__((noreturn))
799# define NORET_AND noreturn,
800
801/* balloc.c */
Mingming Cao3a5b2ec2006-10-11 01:21:05 -0700802extern unsigned int ext4_block_group(struct super_block *sb,
803 ext4_fsblk_t blocknr);
804extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
805 ext4_fsblk_t blocknr);
Mingming Cao617ba132006-10-11 01:20:53 -0700806extern int ext4_bg_has_super(struct super_block *sb, int group);
807extern unsigned long ext4_bg_num_gdb(struct super_block *sb, int group);
808extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
809 ext4_fsblk_t goal, int *errp);
810extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
811 ext4_fsblk_t goal, unsigned long *count, int *errp);
812extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
813 ext4_fsblk_t block, unsigned long count);
814extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
815 ext4_fsblk_t block, unsigned long count,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700816 unsigned long *pdquot_freed_blocks);
Mingming Cao617ba132006-10-11 01:20:53 -0700817extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
818extern void ext4_check_blocks_bitmap (struct super_block *);
819extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700820 unsigned int block_group,
821 struct buffer_head ** bh);
Mingming Cao617ba132006-10-11 01:20:53 -0700822extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
823extern void ext4_init_block_alloc_info(struct inode *);
824extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700825
826/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700827extern int ext4_check_dir_entry(const char *, struct inode *,
828 struct ext4_dir_entry_2 *,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700829 struct buffer_head *, unsigned long);
Mingming Cao617ba132006-10-11 01:20:53 -0700830extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700831 __u32 minor_hash,
Mingming Cao617ba132006-10-11 01:20:53 -0700832 struct ext4_dir_entry_2 *dirent);
833extern void ext4_htree_free_dir_info(struct dir_private_info *p);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700834
835/* fsync.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700836extern int ext4_sync_file (struct file *, struct dentry *, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700837
838/* hash.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700839extern int ext4fs_dirhash(const char *name, int len, struct
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700840 dx_hash_info *hinfo);
841
842/* ialloc.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700843extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
844extern void ext4_free_inode (handle_t *, struct inode *);
845extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
846extern unsigned long ext4_count_free_inodes (struct super_block *);
847extern unsigned long ext4_count_dirs (struct super_block *);
848extern void ext4_check_inodes_bitmap (struct super_block *);
849extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700850
851
852/* inode.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700853int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
854 struct buffer_head *bh, ext4_fsblk_t blocknr);
855struct buffer_head * ext4_getblk (handle_t *, struct inode *, long, int, int *);
856struct buffer_head * ext4_bread (handle_t *, struct inode *, int, int, int *);
857int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700858 sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
859 int create, int extend_disksize);
860
Mingming Cao617ba132006-10-11 01:20:53 -0700861extern void ext4_read_inode (struct inode *);
862extern int ext4_write_inode (struct inode *, int);
863extern int ext4_setattr (struct dentry *, struct iattr *);
864extern void ext4_delete_inode (struct inode *);
865extern int ext4_sync_inode (handle_t *, struct inode *);
866extern void ext4_discard_reservation (struct inode *);
867extern void ext4_dirty_inode(struct inode *);
868extern int ext4_change_inode_journal_flag(struct inode *, int);
869extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
870extern void ext4_truncate (struct inode *);
871extern void ext4_set_inode_flags(struct inode *);
872extern void ext4_set_aops(struct inode *inode);
Alex Tomasa86c6182006-10-11 01:21:03 -0700873extern int ext4_writepage_trans_blocks(struct inode *);
874extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
875 struct address_space *mapping, loff_t from);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700876
877/* ioctl.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700878extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700879 unsigned long);
Mingming Cao617ba132006-10-11 01:20:53 -0700880extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700881
882/* namei.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700883extern int ext4_orphan_add(handle_t *, struct inode *);
884extern int ext4_orphan_del(handle_t *, struct inode *);
885extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700886 __u32 start_minor_hash, __u32 *next_hash);
887
888/* resize.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700889extern int ext4_group_add(struct super_block *sb,
890 struct ext4_new_group_data *input);
891extern int ext4_group_extend(struct super_block *sb,
892 struct ext4_super_block *es,
893 ext4_fsblk_t n_blocks_count);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700894
895/* super.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700896extern void ext4_error (struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700897 __attribute__ ((format (printf, 3, 4)));
Mingming Cao617ba132006-10-11 01:20:53 -0700898extern void __ext4_std_error (struct super_block *, const char *, int);
899extern void ext4_abort (struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700900 __attribute__ ((format (printf, 3, 4)));
Mingming Cao617ba132006-10-11 01:20:53 -0700901extern void ext4_warning (struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700902 __attribute__ ((format (printf, 3, 4)));
Mingming Cao617ba132006-10-11 01:20:53 -0700903extern void ext4_update_dynamic_rev (struct super_block *sb);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700904extern ext4_fsblk_t ext4_block_bitmap(struct ext4_group_desc *bg);
905extern ext4_fsblk_t ext4_inode_bitmap(struct ext4_group_desc *bg);
906extern ext4_fsblk_t ext4_inode_table(struct ext4_group_desc *bg);
907extern void ext4_block_bitmap_set(struct ext4_group_desc *bg, ext4_fsblk_t blk);
908extern void ext4_inode_bitmap_set(struct ext4_group_desc *bg, ext4_fsblk_t blk);
909extern void ext4_inode_table_set(struct ext4_group_desc *bg, ext4_fsblk_t blk);
910
911static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
912{
913 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
914 le32_to_cpu(es->s_blocks_count);
915}
916
917static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
918{
919 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
920 le32_to_cpu(es->s_r_blocks_count);
921}
922
923static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
924{
925 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
926 le32_to_cpu(es->s_free_blocks_count);
927}
928
929static inline void ext4_blocks_count_set(struct ext4_super_block *es,
930 ext4_fsblk_t blk)
931{
932 es->s_blocks_count = cpu_to_le32((u32)blk);
933 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
934}
935
936static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
937 ext4_fsblk_t blk)
938{
939 es->s_free_blocks_count = cpu_to_le32((u32)blk);
940 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
941}
942
943static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
944 ext4_fsblk_t blk)
945{
946 es->s_r_blocks_count = cpu_to_le32((u32)blk);
947 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
948}
949
950
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700951
Mingming Cao617ba132006-10-11 01:20:53 -0700952#define ext4_std_error(sb, errno) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700953do { \
954 if ((errno)) \
Mingming Cao617ba132006-10-11 01:20:53 -0700955 __ext4_std_error((sb), __FUNCTION__, (errno)); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700956} while (0)
957
958/*
959 * Inodes and files operations
960 */
961
962/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700963extern const struct file_operations ext4_dir_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700964
965/* file.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700966extern struct inode_operations ext4_file_inode_operations;
967extern const struct file_operations ext4_file_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700968
969/* namei.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700970extern struct inode_operations ext4_dir_inode_operations;
971extern struct inode_operations ext4_special_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700972
973/* symlink.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700974extern struct inode_operations ext4_symlink_inode_operations;
975extern struct inode_operations ext4_fast_symlink_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700976
Alex Tomasa86c6182006-10-11 01:21:03 -0700977/* extents.c */
978extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
979extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
980extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
981 ext4_fsblk_t iblock,
982 unsigned long max_blocks, struct buffer_head *bh_result,
983 int create, int extend_disksize);
984extern void ext4_ext_truncate(struct inode *, struct page *);
985extern void ext4_ext_init(struct super_block *);
986extern void ext4_ext_release(struct super_block *);
987static inline int
988ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
989 unsigned long max_blocks, struct buffer_head *bh,
990 int create, int extend_disksize)
991{
992 if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
993 return ext4_ext_get_blocks(handle, inode, block, max_blocks,
994 bh, create, extend_disksize);
995 return ext4_get_blocks_handle(handle, inode, block, max_blocks, bh,
996 create, extend_disksize);
997}
998
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700999
1000#endif /* __KERNEL__ */
1001
Mingming Cao617ba132006-10-11 01:20:53 -07001002#endif /* _LINUX_EXT4_FS_H */