blob: b6092940c8b84d21b676e4dac8302d95bbead62a [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 */
Dave Kleikamp8c55e202007-05-24 13:04:54 -040035#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) */
Dave Kleikamp8c55e202007-05-24 13:04:54 -040037#define EXT4_MAX_RESERVE_BLOCKS 1027
Mingming Cao617ba132006-10-11 01:20:53 -070038#define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -070039
40/*
41 * Debug code
42 */
Mingming Cao617ba132006-10-11 01:20:53 -070043#ifdef EXT4FS_DEBUG
44#define ext4_debug(f, a...) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070045 do { \
Mingming Cao617ba132006-10-11 01:20:53 -070046 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070047 __FILE__, __LINE__, __FUNCTION__); \
48 printk (KERN_DEBUG f, ## a); \
49 } while (0)
50#else
Mingming Cao617ba132006-10-11 01:20:53 -070051#define ext4_debug(f, a...) do {} while (0)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070052#endif
53
54/*
55 * Special inodes numbers
56 */
Mingming Cao617ba132006-10-11 01:20:53 -070057#define EXT4_BAD_INO 1 /* Bad blocks inode */
58#define EXT4_ROOT_INO 2 /* Root inode */
59#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
60#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
61#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
62#define EXT4_JOURNAL_INO 8 /* Journal inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -070063
Mingming Cao617ba132006-10-11 01:20:53 -070064/* First non-reserved inode for old ext4 filesystems */
65#define EXT4_GOOD_OLD_FIRST_INO 11
Dave Kleikampac27a0e2006-10-11 01:20:50 -070066
67/*
68 * Maximal count of links to a file
69 */
Andreas Dilgerf8628a12007-07-18 08:38:01 -040070#define EXT4_LINK_MAX 65000
Dave Kleikampac27a0e2006-10-11 01:20:50 -070071
72/*
73 * Macro-instructions used to manage several block sizes
74 */
Mingming Cao617ba132006-10-11 01:20:53 -070075#define EXT4_MIN_BLOCK_SIZE 1024
Takashi Satoafc7cbc2008-01-28 23:58:27 -050076#define EXT4_MAX_BLOCK_SIZE 65536
77#define EXT4_MIN_BLOCK_LOG_SIZE 10
Dave Kleikampac27a0e2006-10-11 01:20:50 -070078#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -070079# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070080#else
Mingming Cao617ba132006-10-11 01:20:53 -070081# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070082#endif
Mingming Cao617ba132006-10-11 01:20:53 -070083#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
Dave Kleikampac27a0e2006-10-11 01:20:50 -070084#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -070085# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070086#else
Mingming Cao617ba132006-10-11 01:20:53 -070087# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070088#endif
89#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -070090#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
91#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
92#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070093#else
Mingming Cao617ba132006-10-11 01:20:53 -070094#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
95 EXT4_GOOD_OLD_INODE_SIZE : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070096 (s)->s_inode_size)
Mingming Cao617ba132006-10-11 01:20:53 -070097#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
98 EXT4_GOOD_OLD_FIRST_INO : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070099 (s)->s_first_ino)
100#endif
Amit Aroraa2df2a62007-07-17 21:42:41 -0400101#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700102
103/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700104 * Structure of a blocks group descriptor
105 */
Mingming Cao617ba132006-10-11 01:20:53 -0700106struct ext4_group_desc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700107{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400108 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400109 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
110 __le32 bg_inode_table_lo; /* Inodes table block */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700111 __le16 bg_free_blocks_count; /* Free blocks count */
112 __le16 bg_free_inodes_count; /* Free inodes count */
113 __le16 bg_used_dirs_count; /* Directories count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400114 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
115 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
116 __le16 bg_itable_unused; /* Unused inodes count */
117 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700118 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
119 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
120 __le32 bg_inode_table_hi; /* Inodes table block MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500121 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
122 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
123 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
124 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
125 __u32 bg_reserved2[3];
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700126};
127
Andreas Dilger717d50e2007-10-16 18:38:25 -0400128#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
129#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
130#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
131
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700132#ifdef __KERNEL__
133#include <linux/ext4_fs_i.h>
134#include <linux/ext4_fs_sb.h>
135#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700136/*
137 * Macro-instructions used to manage group descriptors
138 */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700139#define EXT4_MIN_DESC_SIZE 32
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700140#define EXT4_MIN_DESC_SIZE_64BIT 64
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700141#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
142#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700143#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700144# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
145# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
146# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
147# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700148#else
Mingming Cao617ba132006-10-11 01:20:53 -0700149# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700150# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
Mingming Cao617ba132006-10-11 01:20:53 -0700151# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700152#endif
153
154/*
155 * Constants relative to the data blocks
156 */
Mingming Cao617ba132006-10-11 01:20:53 -0700157#define EXT4_NDIR_BLOCKS 12
158#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
159#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
160#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
161#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700162
163/*
164 * Inode flags
165 */
Mingming Cao617ba132006-10-11 01:20:53 -0700166#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
167#define EXT4_UNRM_FL 0x00000002 /* Undelete */
168#define EXT4_COMPR_FL 0x00000004 /* Compress file */
169#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
170#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
171#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
172#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
173#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700174/* Reserved for compression usage... */
Mingming Cao617ba132006-10-11 01:20:53 -0700175#define EXT4_DIRTY_FL 0x00000100
176#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
177#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
178#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700179/* End compression flags --- maybe not all used */
Mingming Cao617ba132006-10-11 01:20:53 -0700180#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
181#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
182#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
183#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
184#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
185#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500186#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
Alex Tomasa86c6182006-10-11 01:21:03 -0700187#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500188#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700189
Alex Tomasa86c6182006-10-11 01:21:03 -0700190#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
Mingming Cao617ba132006-10-11 01:20:53 -0700191#define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700192
193/*
194 * Inode dynamic state flags
195 */
Mingming Cao617ba132006-10-11 01:20:53 -0700196#define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
197#define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
198#define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
Kalpak Shah6dd4ee72007-07-18 09:19:57 -0400199#define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
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 Kleikamp8c55e202007-05-24 13:04:54 -0400203 __u32 group; /* Group number for this data */
204 __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 */
207 __u32 blocks_count; /* Total number of blocks in this group */
208 __u16 reserved_blocks; /* Number of reserved blocks in this group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700209 __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
Amit Aroraa2df2a62007-07-17 21:42:41 -0400224/*
225 * Following is used by preallocation code to tell get_blocks() that we
226 * want uninitialzed extents.
227 */
228#define EXT4_CREATE_UNINITIALIZED_EXT 2
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700229
230/*
231 * ioctl commands
232 */
Mingming Cao617ba132006-10-11 01:20:53 -0700233#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
234#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
235#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
236#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
237#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
238#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
239#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
240#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
Jose R. Santose23291b2007-07-18 08:57:06 -0400241#ifdef CONFIG_JBD2_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700242#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700243#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700244#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
245#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700246
247/*
248 * ioctl commands in 32 bit emulation
249 */
Mingming Cao617ba132006-10-11 01:20:53 -0700250#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
251#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
252#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
253#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
254#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
255#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
256#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
Jose R. Santose23291b2007-07-18 08:57:06 -0400257#ifdef CONFIG_JBD2_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700258#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700259#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700260#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
261#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700262
263
264/*
265 * Mount options
266 */
Mingming Cao617ba132006-10-11 01:20:53 -0700267struct ext4_mount_options {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700268 unsigned long s_mount_opt;
269 uid_t s_resuid;
270 gid_t s_resgid;
271 unsigned long s_commit_interval;
272#ifdef CONFIG_QUOTA
273 int s_jquota_fmt;
274 char *s_qf_names[MAXQUOTAS];
275#endif
276};
277
278/*
279 * Structure of an inode on the disk
280 */
Mingming Cao617ba132006-10-11 01:20:53 -0700281struct ext4_inode {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700282 __le16 i_mode; /* File mode */
283 __le16 i_uid; /* Low 16 bits of Owner Uid */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500284 __le32 i_size_lo; /* Size in bytes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700285 __le32 i_atime; /* Access time */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400286 __le32 i_ctime; /* Inode Change time */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700287 __le32 i_mtime; /* Modification time */
288 __le32 i_dtime; /* Deletion Time */
289 __le16 i_gid; /* Low 16 bits of Group Id */
290 __le16 i_links_count; /* Links count */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500291 __le32 i_blocks_lo; /* Blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700292 __le32 i_flags; /* File flags */
293 union {
294 struct {
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500295 __le32 l_i_version;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700296 } linux1;
297 struct {
298 __u32 h_i_translator;
299 } hurd1;
300 struct {
301 __u32 m_i_reserved1;
302 } masix1;
303 } osd1; /* OS dependent 1 */
Mingming Cao617ba132006-10-11 01:20:53 -0700304 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700305 __le32 i_generation; /* File version (for NFS) */
Aneesh Kumar K.V7973c0c2008-01-28 23:58:27 -0500306 __le32 i_file_acl_lo; /* File ACL */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500307 __le32 i_size_high;
Coly Lif077d0d2007-10-16 18:38:25 -0400308 __le32 i_obso_faddr; /* Obsoleted fragment address */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700309 union {
310 struct {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500311 __le16 l_i_blocks_high; /* were l_i_reserved1 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700312 __le16 l_i_file_acl_high;
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400313 __le16 l_i_uid_high; /* these 2 fields */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700314 __le16 l_i_gid_high; /* were reserved2[0] */
315 __u32 l_i_reserved2;
316 } linux2;
317 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400318 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700319 __u16 h_i_mode_high;
320 __u16 h_i_uid_high;
321 __u16 h_i_gid_high;
322 __u32 h_i_author;
323 } hurd2;
324 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400325 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700326 __le16 m_i_file_acl_high;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700327 __u32 m_i_reserved2[2];
328 } masix2;
329 } osd2; /* OS dependent 2 */
330 __le16 i_extra_isize;
331 __le16 i_pad1;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400332 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
333 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
334 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
335 __le32 i_crtime; /* File Creation time */
336 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500337 __le32 i_version_hi; /* high 32 bits for 64-bit version */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700338};
339
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700340
Kalpak Shahef7f3832007-07-18 09:15:20 -0400341#define EXT4_EPOCH_BITS 2
342#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
343#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
344
345/*
346 * Extended fields will fit into an inode if the filesystem was formatted
347 * with large inodes (-I 256 or larger) and there are not currently any EAs
348 * consuming all of the available space. For new inodes we always reserve
349 * enough space for the kernel's known extended fields, but for inodes
350 * created with an old kernel this might not have been the case. None of
351 * the extended inode fields is critical for correct filesystem operation.
352 * This macro checks if a certain field fits in the inode. Note that
353 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
354 */
355#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
356 ((offsetof(typeof(*ext4_inode), field) + \
357 sizeof((ext4_inode)->field)) \
358 <= (EXT4_GOOD_OLD_INODE_SIZE + \
359 (einode)->i_extra_isize)) \
360
361static inline __le32 ext4_encode_extra_time(struct timespec *time)
362{
363 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
364 time->tv_sec >> 32 : 0) |
365 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
366}
367
368static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
369{
370 if (sizeof(time->tv_sec) > 4)
371 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
372 << 32;
373 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
374}
375
376#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
377do { \
378 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
379 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
380 (raw_inode)->xtime ## _extra = \
381 ext4_encode_extra_time(&(inode)->xtime); \
382} while (0)
383
384#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
385do { \
386 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
387 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
388 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
389 (raw_inode)->xtime ## _extra = \
390 ext4_encode_extra_time(&(einode)->xtime); \
391} while (0)
392
393#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
394do { \
395 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
396 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
397 ext4_decode_extra_time(&(inode)->xtime, \
398 raw_inode->xtime ## _extra); \
399} while (0)
400
401#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
402do { \
403 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
404 (einode)->xtime.tv_sec = \
405 (signed)le32_to_cpu((raw_inode)->xtime); \
406 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
407 ext4_decode_extra_time(&(einode)->xtime, \
408 raw_inode->xtime ## _extra); \
409} while (0)
410
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500411#define i_disk_version osd1.linux1.l_i_version
412
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700413#if defined(__KERNEL__) || defined(__linux__)
414#define i_reserved1 osd1.linux1.l_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700415#define i_file_acl_high osd2.linux2.l_i_file_acl_high
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500416#define i_blocks_high osd2.linux2.l_i_blocks_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700417#define i_uid_low i_uid
418#define i_gid_low i_gid
419#define i_uid_high osd2.linux2.l_i_uid_high
420#define i_gid_high osd2.linux2.l_i_gid_high
421#define i_reserved2 osd2.linux2.l_i_reserved2
422
423#elif defined(__GNU__)
424
425#define i_translator osd1.hurd1.h_i_translator
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700426#define i_uid_high osd2.hurd2.h_i_uid_high
427#define i_gid_high osd2.hurd2.h_i_gid_high
428#define i_author osd2.hurd2.h_i_author
429
430#elif defined(__masix__)
431
432#define i_reserved1 osd1.masix1.m_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700433#define i_file_acl_high osd2.masix2.m_i_file_acl_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700434#define i_reserved2 osd2.masix2.m_i_reserved2
435
436#endif /* defined(__KERNEL__) || defined(__linux__) */
437
438/*
439 * File system states
440 */
Mingming Cao617ba132006-10-11 01:20:53 -0700441#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
442#define EXT4_ERROR_FS 0x0002 /* Errors detected */
443#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700444
445/*
446 * Mount flags
447 */
Mingming Cao617ba132006-10-11 01:20:53 -0700448#define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
449#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
450#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
451#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
452#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
453#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
454#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
455#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
456#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
457#define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
458#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
459#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
460#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
461#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
462#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
463#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
464#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
465#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
466#define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
467#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
468#define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
469#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
470#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
471#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
Alex Tomasa86c6182006-10-11 01:21:03 -0700472#define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
Girish Shilamkar818d2762008-01-28 23:58:27 -0500473#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
474#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500475#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
Mingming Cao617ba132006-10-11 01:20:53 -0700476/* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700477#ifndef _LINUX_EXT2_FS_H
Mingming Cao617ba132006-10-11 01:20:53 -0700478#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
479#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
480#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
481 EXT4_MOUNT_##opt)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700482#else
Mingming Cao617ba132006-10-11 01:20:53 -0700483#define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
484#define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
485#define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700486#endif
487
Mingming Cao617ba132006-10-11 01:20:53 -0700488#define ext4_set_bit ext2_set_bit
489#define ext4_set_bit_atomic ext2_set_bit_atomic
490#define ext4_clear_bit ext2_clear_bit
491#define ext4_clear_bit_atomic ext2_clear_bit_atomic
492#define ext4_test_bit ext2_test_bit
493#define ext4_find_first_zero_bit ext2_find_first_zero_bit
494#define ext4_find_next_zero_bit ext2_find_next_zero_bit
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700495
496/*
497 * Maximal mount counts between two filesystem checks
498 */
Mingming Cao617ba132006-10-11 01:20:53 -0700499#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
500#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700501
502/*
503 * Behaviour when detecting errors
504 */
Mingming Cao617ba132006-10-11 01:20:53 -0700505#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
506#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
507#define EXT4_ERRORS_PANIC 3 /* Panic */
508#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700509
510/*
511 * Structure of the super block
512 */
Mingming Cao617ba132006-10-11 01:20:53 -0700513struct ext4_super_block {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700514/*00*/ __le32 s_inodes_count; /* Inodes count */
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -0400515 __le32 s_blocks_count_lo; /* Blocks count */
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -0400516 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
517 __le32 s_free_blocks_count_lo; /* Free blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700518/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
519 __le32 s_first_data_block; /* First Data Block */
520 __le32 s_log_block_size; /* Block size */
Coly Lif077d0d2007-10-16 18:38:25 -0400521 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700522/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
Coly Lif077d0d2007-10-16 18:38:25 -0400523 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700524 __le32 s_inodes_per_group; /* # Inodes per group */
525 __le32 s_mtime; /* Mount time */
526/*30*/ __le32 s_wtime; /* Write time */
527 __le16 s_mnt_count; /* Mount count */
528 __le16 s_max_mnt_count; /* Maximal mount count */
529 __le16 s_magic; /* Magic signature */
530 __le16 s_state; /* File system state */
531 __le16 s_errors; /* Behaviour when detecting errors */
532 __le16 s_minor_rev_level; /* minor revision level */
533/*40*/ __le32 s_lastcheck; /* time of last check */
534 __le32 s_checkinterval; /* max. time between checks */
535 __le32 s_creator_os; /* OS */
536 __le32 s_rev_level; /* Revision level */
537/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
538 __le16 s_def_resgid; /* Default gid for reserved blocks */
539 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700540 * These fields are for EXT4_DYNAMIC_REV superblocks only.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700541 *
542 * Note: the difference between the compatible feature set and
543 * the incompatible feature set is that if there is a bit set
544 * in the incompatible feature set that the kernel doesn't
545 * know about, it should refuse to mount the filesystem.
546 *
547 * e2fsck's requirements are more strict; if it doesn't know
548 * about a feature in either the compatible or incompatible
549 * feature set, it must abort and not try to meddle with
550 * things it doesn't understand...
551 */
552 __le32 s_first_ino; /* First non-reserved inode */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700553 __le16 s_inode_size; /* size of inode structure */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700554 __le16 s_block_group_nr; /* block group # of this superblock */
555 __le32 s_feature_compat; /* compatible feature set */
556/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
557 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
558/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
559/*78*/ char s_volume_name[16]; /* volume name */
560/*88*/ char s_last_mounted[64]; /* directory where last mounted */
561/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
562 /*
563 * Performance hints. Directory preallocation should only
Mingming Cao617ba132006-10-11 01:20:53 -0700564 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700565 */
566 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
567 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
568 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
569 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700570 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700571 */
572/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
573/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
574 __le32 s_journal_dev; /* device number of journal file */
575 __le32 s_last_orphan; /* start of list of inodes to delete */
576 __le32 s_hash_seed[4]; /* HTREE hash seed */
577 __u8 s_def_hash_version; /* Default hash version to use */
578 __u8 s_reserved_char_pad;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700579 __le16 s_desc_size; /* size of group descriptor */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700580/*100*/ __le32 s_default_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700581 __le32 s_first_meta_bg; /* First metablock block group */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700582 __le32 s_mkfs_time; /* When the filesystem was created */
583 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
584 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
585/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
586 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
587 __le32 s_free_blocks_count_hi; /* Free blocks count */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -0400588 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
589 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
590 __le32 s_flags; /* Miscellaneous flags */
591 __le16 s_raid_stride; /* RAID stride */
592 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
593 __le64 s_mmp_block; /* Block for multi-mount protection */
594 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
Theodore Ts'o436bd752007-05-31 12:43:28 -0400595 __u32 s_reserved[163]; /* Padding to the end of the block */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700596};
597
598#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700599static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700600{
601 return sb->s_fs_info;
602}
Mingming Cao617ba132006-10-11 01:20:53 -0700603static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700604{
Mingming Cao617ba132006-10-11 01:20:53 -0700605 return container_of(inode, struct ext4_inode_info, vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700606}
607
Kalpak Shahef7f3832007-07-18 09:15:20 -0400608static inline struct timespec ext4_current_time(struct inode *inode)
609{
610 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
611 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
612}
613
614
Mingming Cao617ba132006-10-11 01:20:53 -0700615static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700616{
Mingming Cao617ba132006-10-11 01:20:53 -0700617 return ino == EXT4_ROOT_INO ||
618 ino == EXT4_JOURNAL_INO ||
619 ino == EXT4_RESIZE_INO ||
620 (ino >= EXT4_FIRST_INO(sb) &&
621 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700622}
623#else
Mingming Cao617ba132006-10-11 01:20:53 -0700624/* Assume that user mode programs are passing in an ext4fs superblock, not
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700625 * a kernel struct super_block. This will allow us to call the feature-test
626 * macros from user land. */
Mingming Cao617ba132006-10-11 01:20:53 -0700627#define EXT4_SB(sb) (sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700628#endif
629
Mingming Cao617ba132006-10-11 01:20:53 -0700630#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700631
632/*
633 * Codes for operating systems
634 */
Mingming Cao617ba132006-10-11 01:20:53 -0700635#define EXT4_OS_LINUX 0
636#define EXT4_OS_HURD 1
637#define EXT4_OS_MASIX 2
638#define EXT4_OS_FREEBSD 3
639#define EXT4_OS_LITES 4
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700640
641/*
642 * Revision levels
643 */
Mingming Cao617ba132006-10-11 01:20:53 -0700644#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
645#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700646
Mingming Cao617ba132006-10-11 01:20:53 -0700647#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
648#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700649
Mingming Cao617ba132006-10-11 01:20:53 -0700650#define EXT4_GOOD_OLD_INODE_SIZE 128
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700651
652/*
653 * Feature set definitions
654 */
655
Mingming Cao617ba132006-10-11 01:20:53 -0700656#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
657 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
658#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
659 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
660#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
661 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
662#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
663 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
664#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
665 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
666#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
667 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
668#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
669 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
670#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
671 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
672#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
673 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700674
Mingming Cao617ba132006-10-11 01:20:53 -0700675#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
676#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
677#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
678#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
679#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
680#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700681
Mingming Cao617ba132006-10-11 01:20:53 -0700682#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
683#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
684#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500685#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
Andreas Dilger717d50e2007-10-16 18:38:25 -0400686#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400687#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
Kalpak Shahef7f3832007-07-18 09:15:20 -0400688#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700689
Mingming Cao617ba132006-10-11 01:20:53 -0700690#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
691#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
692#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
693#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
694#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
Alex Tomasa86c6182006-10-11 01:21:03 -0700695#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700696#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500697#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
Jose R. Santosce421582007-10-16 18:38:25 -0400698#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700699
Mingming Cao617ba132006-10-11 01:20:53 -0700700#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
701#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
702 EXT4_FEATURE_INCOMPAT_RECOVER| \
Alex Tomasa86c6182006-10-11 01:21:03 -0700703 EXT4_FEATURE_INCOMPAT_META_BG| \
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700704 EXT4_FEATURE_INCOMPAT_EXTENTS| \
Jose R. Santosce421582007-10-16 18:38:25 -0400705 EXT4_FEATURE_INCOMPAT_64BIT| \
706 EXT4_FEATURE_INCOMPAT_FLEX_BG)
Mingming Cao617ba132006-10-11 01:20:53 -0700707#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
708 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
Andreas Dilger717d50e2007-10-16 18:38:25 -0400709 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400710 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
Kalpak Shahef7f3832007-07-18 09:15:20 -0400711 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500712 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
713 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700714
715/*
716 * Default values for user and/or group using reserved blocks
717 */
Mingming Cao617ba132006-10-11 01:20:53 -0700718#define EXT4_DEF_RESUID 0
719#define EXT4_DEF_RESGID 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700720
721/*
722 * Default mount options
723 */
Mingming Cao617ba132006-10-11 01:20:53 -0700724#define EXT4_DEFM_DEBUG 0x0001
725#define EXT4_DEFM_BSDGROUPS 0x0002
726#define EXT4_DEFM_XATTR_USER 0x0004
727#define EXT4_DEFM_ACL 0x0008
728#define EXT4_DEFM_UID16 0x0010
729#define EXT4_DEFM_JMODE 0x0060
730#define EXT4_DEFM_JMODE_DATA 0x0020
731#define EXT4_DEFM_JMODE_ORDERED 0x0040
732#define EXT4_DEFM_JMODE_WBACK 0x0060
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700733
734/*
735 * Structure of a directory entry
736 */
Mingming Cao617ba132006-10-11 01:20:53 -0700737#define EXT4_NAME_LEN 255
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700738
Mingming Cao617ba132006-10-11 01:20:53 -0700739struct ext4_dir_entry {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700740 __le32 inode; /* Inode number */
741 __le16 rec_len; /* Directory entry length */
742 __le16 name_len; /* Name length */
Mingming Cao617ba132006-10-11 01:20:53 -0700743 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700744};
745
746/*
Mingming Cao617ba132006-10-11 01:20:53 -0700747 * The new version of the directory entry. Since EXT4 structures are
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700748 * stored in intel byte order, and the name_len field could never be
749 * bigger than 255 chars, it's safe to reclaim the extra byte for the
750 * file_type field.
751 */
Mingming Cao617ba132006-10-11 01:20:53 -0700752struct ext4_dir_entry_2 {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700753 __le32 inode; /* Inode number */
754 __le16 rec_len; /* Directory entry length */
755 __u8 name_len; /* Name length */
756 __u8 file_type;
Mingming Cao617ba132006-10-11 01:20:53 -0700757 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700758};
759
760/*
Mingming Cao617ba132006-10-11 01:20:53 -0700761 * Ext4 directory file types. Only the low 3 bits are used. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700762 * other bits are reserved for now.
763 */
Mingming Cao617ba132006-10-11 01:20:53 -0700764#define EXT4_FT_UNKNOWN 0
765#define EXT4_FT_REG_FILE 1
766#define EXT4_FT_DIR 2
767#define EXT4_FT_CHRDEV 3
768#define EXT4_FT_BLKDEV 4
769#define EXT4_FT_FIFO 5
770#define EXT4_FT_SOCK 6
771#define EXT4_FT_SYMLINK 7
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700772
Mingming Cao617ba132006-10-11 01:20:53 -0700773#define EXT4_FT_MAX 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700774
775/*
Mingming Cao617ba132006-10-11 01:20:53 -0700776 * EXT4_DIR_PAD defines the directory entries boundaries
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700777 *
778 * NOTE: It must be a multiple of 4
779 */
Mingming Cao617ba132006-10-11 01:20:53 -0700780#define EXT4_DIR_PAD 4
781#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
782#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
783 ~EXT4_DIR_ROUND)
Jan Karaa72d7f82008-01-28 23:58:27 -0500784#define EXT4_MAX_REC_LEN ((1<<16)-1)
785
786static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
787{
788 unsigned len = le16_to_cpu(dlen);
789
790 if (len == EXT4_MAX_REC_LEN)
791 return 1 << 16;
792 return len;
793}
794
795static inline __le16 ext4_rec_len_to_disk(unsigned len)
796{
797 if (len == (1 << 16))
798 return cpu_to_le16(EXT4_MAX_REC_LEN);
799 else if (len > (1 << 16))
800 BUG();
801 return cpu_to_le16(len);
802}
803
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700804/*
805 * Hash Tree Directory indexing
806 * (c) Daniel Phillips, 2001
807 */
808
Eric Sandeen4074fe32007-10-16 18:38:25 -0400809#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
810 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
Mingming Cao617ba132006-10-11 01:20:53 -0700811 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
812#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
813#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700814
815/* Legal values for the dx_root hash_version field: */
816
817#define DX_HASH_LEGACY 0
818#define DX_HASH_HALF_MD4 1
819#define DX_HASH_TEA 2
820
821#ifdef __KERNEL__
822
823/* hash info structure used by the directory hash */
824struct dx_hash_info
825{
826 u32 hash;
827 u32 minor_hash;
828 int hash_version;
829 u32 *seed;
830};
831
Mingming Cao617ba132006-10-11 01:20:53 -0700832#define EXT4_HTREE_EOF 0x7fffffff
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700833
834/*
Mingming Cao617ba132006-10-11 01:20:53 -0700835 * Control parameters used by ext4_htree_next_block
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700836 */
837#define HASH_NB_ALWAYS 1
838
839
840/*
841 * Describe an inode's exact location on disk and in memory
842 */
Mingming Cao617ba132006-10-11 01:20:53 -0700843struct ext4_iloc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700844{
845 struct buffer_head *bh;
846 unsigned long offset;
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500847 ext4_group_t block_group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700848};
849
Mingming Cao617ba132006-10-11 01:20:53 -0700850static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700851{
Mingming Cao617ba132006-10-11 01:20:53 -0700852 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700853}
854
855/*
856 * This structure is stuffed into the struct file's private_data field
857 * for directories. It is where we put information so that we can do
858 * readdir operations in hash tree order.
859 */
860struct dir_private_info {
861 struct rb_root root;
862 struct rb_node *curr_node;
863 struct fname *extra_fname;
864 loff_t last_pos;
865 __u32 curr_hash;
866 __u32 curr_minor_hash;
867 __u32 next_hash;
868};
869
870/* calculate the first block number of the group */
Mingming Cao617ba132006-10-11 01:20:53 -0700871static inline ext4_fsblk_t
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500872ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700873{
Mingming Cao617ba132006-10-11 01:20:53 -0700874 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
875 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700876}
877
878/*
879 * Special error return code only used by dx_probe() and its callers.
880 */
881#define ERR_BAD_DX_DIR -75000
882
Andrew Morton72b64b52006-10-11 01:21:18 -0700883void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
884 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
Mingming Cao3a5b2ec2006-10-11 01:21:05 -0700885
886/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700887 * Function prototypes
888 */
889
890/*
891 * Ok, these declarations are also in <linux/kernel.h> but none of the
Mingming Cao617ba132006-10-11 01:20:53 -0700892 * ext4 source programs needs to include it so they are duplicated here.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700893 */
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400894# define NORET_TYPE /**/
895# define ATTRIB_NORET __attribute__((noreturn))
896# define NORET_AND noreturn,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700897
898/* balloc.c */
Mingming Cao3a5b2ec2006-10-11 01:21:05 -0700899extern unsigned int ext4_block_group(struct super_block *sb,
900 ext4_fsblk_t blocknr);
901extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
902 ext4_fsblk_t blocknr);
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500903extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
904extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
905 ext4_group_t group);
Mingming Cao617ba132006-10-11 01:20:53 -0700906extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
907 ext4_fsblk_t goal, int *errp);
908extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
909 ext4_fsblk_t goal, unsigned long *count, int *errp);
Aneesh Kumar K.V1d03ec92008-01-28 23:58:27 -0500910extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
911 ext4_fsblk_t goal, unsigned long *count, int *errp);
Mingming Cao617ba132006-10-11 01:20:53 -0700912extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
913 ext4_fsblk_t block, unsigned long count);
914extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
915 ext4_fsblk_t block, unsigned long count,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700916 unsigned long *pdquot_freed_blocks);
Mingming Cao617ba132006-10-11 01:20:53 -0700917extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
918extern void ext4_check_blocks_bitmap (struct super_block *);
919extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500920 ext4_group_t block_group,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700921 struct buffer_head ** bh);
Mingming Cao617ba132006-10-11 01:20:53 -0700922extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
923extern void ext4_init_block_alloc_info(struct inode *);
924extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700925
926/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700927extern int ext4_check_dir_entry(const char *, struct inode *,
928 struct ext4_dir_entry_2 *,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700929 struct buffer_head *, unsigned long);
Mingming Cao617ba132006-10-11 01:20:53 -0700930extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700931 __u32 minor_hash,
Mingming Cao617ba132006-10-11 01:20:53 -0700932 struct ext4_dir_entry_2 *dirent);
933extern void ext4_htree_free_dir_info(struct dir_private_info *p);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700934
935/* fsync.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700936extern int ext4_sync_file (struct file *, struct dentry *, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700937
938/* hash.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700939extern int ext4fs_dirhash(const char *name, int len, struct
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700940 dx_hash_info *hinfo);
941
942/* ialloc.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700943extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
944extern void ext4_free_inode (handle_t *, struct inode *);
945extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
946extern unsigned long ext4_count_free_inodes (struct super_block *);
947extern unsigned long ext4_count_dirs (struct super_block *);
948extern void ext4_check_inodes_bitmap (struct super_block *);
949extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700950
951
952/* inode.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700953int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
954 struct buffer_head *bh, ext4_fsblk_t blocknr);
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500955struct buffer_head *ext4_getblk(handle_t *, struct inode *,
956 ext4_lblk_t, int, int *);
957struct buffer_head *ext4_bread(handle_t *, struct inode *,
958 ext4_lblk_t, int, int *);
Mingming Cao617ba132006-10-11 01:20:53 -0700959int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500960 ext4_lblk_t iblock, unsigned long maxblocks,
961 struct buffer_head *bh_result,
962 int create, int extend_disksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700963
Mingming Cao617ba132006-10-11 01:20:53 -0700964extern void ext4_read_inode (struct inode *);
965extern int ext4_write_inode (struct inode *, int);
966extern int ext4_setattr (struct dentry *, struct iattr *);
967extern void ext4_delete_inode (struct inode *);
968extern int ext4_sync_inode (handle_t *, struct inode *);
969extern void ext4_discard_reservation (struct inode *);
970extern void ext4_dirty_inode(struct inode *);
971extern int ext4_change_inode_journal_flag(struct inode *, int);
972extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
973extern void ext4_truncate (struct inode *);
974extern void ext4_set_inode_flags(struct inode *);
Jan Karaff9ddf72007-07-18 09:24:20 -0400975extern void ext4_get_inode_flags(struct ext4_inode_info *);
Mingming Cao617ba132006-10-11 01:20:53 -0700976extern void ext4_set_aops(struct inode *inode);
Alex Tomasa86c6182006-10-11 01:21:03 -0700977extern int ext4_writepage_trans_blocks(struct inode *);
978extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
979 struct address_space *mapping, loff_t from);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700980
981/* ioctl.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700982extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700983 unsigned long);
Mingming Cao617ba132006-10-11 01:20:53 -0700984extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700985
986/* namei.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700987extern int ext4_orphan_add(handle_t *, struct inode *);
988extern int ext4_orphan_del(handle_t *, struct inode *);
989extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700990 __u32 start_minor_hash, __u32 *next_hash);
991
992/* resize.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700993extern int ext4_group_add(struct super_block *sb,
994 struct ext4_new_group_data *input);
995extern int ext4_group_extend(struct super_block *sb,
996 struct ext4_super_block *es,
997 ext4_fsblk_t n_blocks_count);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700998
999/* super.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001000extern void ext4_error (struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001001 __attribute__ ((format (printf, 3, 4)));
Mingming Cao617ba132006-10-11 01:20:53 -07001002extern void __ext4_std_error (struct super_block *, const char *, int);
1003extern void ext4_abort (struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001004 __attribute__ ((format (printf, 3, 4)));
Mingming Cao617ba132006-10-11 01:20:53 -07001005extern void ext4_warning (struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001006 __attribute__ ((format (printf, 3, 4)));
Mingming Cao617ba132006-10-11 01:20:53 -07001007extern void ext4_update_dynamic_rev (struct super_block *sb);
Aneesh Kumar K.V99e6f822008-01-28 23:58:27 -05001008extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1009 __u32 compat);
1010extern int ext4_update_rocompat_feature(handle_t *handle,
1011 struct super_block *sb, __u32 rocompat);
1012extern int ext4_update_incompat_feature(handle_t *handle,
1013 struct super_block *sb, __u32 incompat);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001014extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1015 struct ext4_group_desc *bg);
1016extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1017 struct ext4_group_desc *bg);
1018extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1019 struct ext4_group_desc *bg);
1020extern void ext4_block_bitmap_set(struct super_block *sb,
1021 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1022extern void ext4_inode_bitmap_set(struct super_block *sb,
1023 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1024extern void ext4_inode_table_set(struct super_block *sb,
1025 struct ext4_group_desc *bg, ext4_fsblk_t blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001026
1027static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1028{
1029 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001030 le32_to_cpu(es->s_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001031}
1032
1033static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1034{
1035 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001036 le32_to_cpu(es->s_r_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001037}
1038
1039static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1040{
1041 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001042 le32_to_cpu(es->s_free_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001043}
1044
1045static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1046 ext4_fsblk_t blk)
1047{
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001048 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001049 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1050}
1051
1052static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1053 ext4_fsblk_t blk)
1054{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001055 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001056 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1057}
1058
1059static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1060 ext4_fsblk_t blk)
1061{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001062 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001063 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1064}
1065
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001066static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1067{
1068 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1069 le32_to_cpu(raw_inode->i_size_lo);
1070}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001071
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001072static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1073{
1074 raw_inode->i_size_lo = cpu_to_le32(i_size);
1075 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1076}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001077
Mingming Cao617ba132006-10-11 01:20:53 -07001078#define ext4_std_error(sb, errno) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001079do { \
1080 if ((errno)) \
Mingming Cao617ba132006-10-11 01:20:53 -07001081 __ext4_std_error((sb), __FUNCTION__, (errno)); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001082} while (0)
1083
1084/*
1085 * Inodes and files operations
1086 */
1087
1088/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001089extern const struct file_operations ext4_dir_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001090
1091/* file.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001092extern const struct inode_operations ext4_file_inode_operations;
Mingming Cao617ba132006-10-11 01:20:53 -07001093extern const struct file_operations ext4_file_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001094
1095/* namei.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001096extern const struct inode_operations ext4_dir_inode_operations;
1097extern const struct inode_operations ext4_special_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001098
1099/* symlink.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001100extern const struct inode_operations ext4_symlink_inode_operations;
1101extern const struct inode_operations ext4_fast_symlink_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001102
Alex Tomasa86c6182006-10-11 01:21:03 -07001103/* extents.c */
1104extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1105extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1106extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001107 ext4_lblk_t iblock,
Alex Tomasa86c6182006-10-11 01:21:03 -07001108 unsigned long max_blocks, struct buffer_head *bh_result,
1109 int create, int extend_disksize);
1110extern void ext4_ext_truncate(struct inode *, struct page *);
1111extern void ext4_ext_init(struct super_block *);
1112extern void ext4_ext_release(struct super_block *);
Amit Aroraa2df2a62007-07-17 21:42:41 -04001113extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1114 loff_t len);
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -05001115extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1116 sector_t block, unsigned long max_blocks,
1117 struct buffer_head *bh, int create,
1118 int extend_disksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001119#endif /* __KERNEL__ */
1120
Mingming Cao617ba132006-10-11 01:20:53 -07001121#endif /* _LINUX_EXT4_FS_H */