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Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04002 * ext4.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
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040016#ifndef _EXT4_H
17#define _EXT4_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>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040022#include "ext4_i.h"
Alex Tomasc9de5602008-01-29 00:19:52 -050023
Dave Kleikampac27a0e2006-10-11 01:20:50 -070024/*
Shen Feng8a356942008-07-11 19:27:31 -040025 * The fourth extended filesystem constants/structures
Dave Kleikampac27a0e2006-10-11 01:20:50 -070026 */
27
28/*
Mingming Cao617ba132006-10-11 01:20:53 -070029 * Define EXT4FS_DEBUG to produce debug messages
Dave Kleikampac27a0e2006-10-11 01:20:50 -070030 */
Mingming Cao617ba132006-10-11 01:20:53 -070031#undef EXT4FS_DEBUG
Dave Kleikampac27a0e2006-10-11 01:20:50 -070032
33/*
Mingming Cao617ba132006-10-11 01:20:53 -070034 * Define EXT4_RESERVATION to reserve data blocks for expanding files
Dave Kleikampac27a0e2006-10-11 01:20:50 -070035 */
Dave Kleikamp8c55e202007-05-24 13:04:54 -040036#define EXT4_DEFAULT_RESERVE_BLOCKS 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -070037/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
Dave Kleikamp8c55e202007-05-24 13:04:54 -040038#define EXT4_MAX_RESERVE_BLOCKS 1027
Mingming Cao617ba132006-10-11 01:20:53 -070039#define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -070040
41/*
42 * Debug code
43 */
Mingming Cao617ba132006-10-11 01:20:53 -070044#ifdef EXT4FS_DEBUG
45#define ext4_debug(f, a...) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070046 do { \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040047 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
Stoyan Gaydarov4db9c542008-07-13 21:03:29 -040048 __FILE__, __LINE__, __func__); \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040049 printk(KERN_DEBUG f, ## a); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070050 } while (0)
51#else
Mingming Cao617ba132006-10-11 01:20:53 -070052#define ext4_debug(f, a...) do {} while (0)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070053#endif
54
Alex Tomasc9de5602008-01-29 00:19:52 -050055#define EXT4_MULTIBLOCK_ALLOCATOR 1
56
57/* prefer goal again. length */
58#define EXT4_MB_HINT_MERGE 1
59/* blocks already reserved */
60#define EXT4_MB_HINT_RESERVED 2
61/* metadata is being allocated */
62#define EXT4_MB_HINT_METADATA 4
63/* first blocks in the file */
64#define EXT4_MB_HINT_FIRST 8
65/* search for the best chunk */
66#define EXT4_MB_HINT_BEST 16
67/* data is being allocated */
68#define EXT4_MB_HINT_DATA 32
69/* don't preallocate (for tails) */
70#define EXT4_MB_HINT_NOPREALLOC 64
71/* allocate for locality group */
72#define EXT4_MB_HINT_GROUP_ALLOC 128
73/* allocate goal blocks or none */
74#define EXT4_MB_HINT_GOAL_ONLY 256
75/* goal is meaningful */
76#define EXT4_MB_HINT_TRY_GOAL 512
Mingming Caod2a17632008-07-14 17:52:37 -040077/* blocks already pre-reserved by delayed allocation */
78#define EXT4_MB_DELALLOC_RESERVED 1024
79
Alex Tomasc9de5602008-01-29 00:19:52 -050080
81struct ext4_allocation_request {
82 /* target inode for block we're allocating */
83 struct inode *inode;
84 /* logical block in target inode */
85 ext4_lblk_t logical;
86 /* phys. target (a hint) */
87 ext4_fsblk_t goal;
88 /* the closest logical allocated block to the left */
89 ext4_lblk_t lleft;
90 /* phys. block for ^^^ */
91 ext4_fsblk_t pleft;
92 /* the closest logical allocated block to the right */
93 ext4_lblk_t lright;
94 /* phys. block for ^^^ */
95 ext4_fsblk_t pright;
96 /* how many blocks we want to allocate */
97 unsigned long len;
98 /* flags. see above EXT4_MB_HINT_* */
99 unsigned long flags;
100};
101
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700102/*
103 * Special inodes numbers
104 */
Mingming Cao617ba132006-10-11 01:20:53 -0700105#define EXT4_BAD_INO 1 /* Bad blocks inode */
106#define EXT4_ROOT_INO 2 /* Root inode */
107#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
108#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
109#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
110#define EXT4_JOURNAL_INO 8 /* Journal inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700111
Mingming Cao617ba132006-10-11 01:20:53 -0700112/* First non-reserved inode for old ext4 filesystems */
113#define EXT4_GOOD_OLD_FIRST_INO 11
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700114
115/*
116 * Maximal count of links to a file
117 */
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400118#define EXT4_LINK_MAX 65000
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700119
120/*
121 * Macro-instructions used to manage several block sizes
122 */
Mingming Cao617ba132006-10-11 01:20:53 -0700123#define EXT4_MIN_BLOCK_SIZE 1024
Takashi Satoafc7cbc2008-01-28 23:58:27 -0500124#define EXT4_MAX_BLOCK_SIZE 65536
125#define EXT4_MIN_BLOCK_LOG_SIZE 10
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700126#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700127# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700128#else
Mingming Cao617ba132006-10-11 01:20:53 -0700129# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700130#endif
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400131#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700132#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700133# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700134#else
Mingming Cao617ba132006-10-11 01:20:53 -0700135# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700136#endif
137#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700138#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
139#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
140#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700141#else
Mingming Cao617ba132006-10-11 01:20:53 -0700142#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
143 EXT4_GOOD_OLD_INODE_SIZE : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700144 (s)->s_inode_size)
Mingming Cao617ba132006-10-11 01:20:53 -0700145#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
146 EXT4_GOOD_OLD_FIRST_INO : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700147 (s)->s_first_ino)
148#endif
Amit Aroraa2df2a62007-07-17 21:42:41 -0400149#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700150
151/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700152 * Structure of a blocks group descriptor
153 */
Mingming Cao617ba132006-10-11 01:20:53 -0700154struct ext4_group_desc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700155{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400156 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400157 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
158 __le32 bg_inode_table_lo; /* Inodes table block */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700159 __le16 bg_free_blocks_count; /* Free blocks count */
160 __le16 bg_free_inodes_count; /* Free inodes count */
161 __le16 bg_used_dirs_count; /* Directories count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400162 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
163 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
164 __le16 bg_itable_unused; /* Unused inodes count */
165 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700166 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
167 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
168 __le32 bg_inode_table_hi; /* Inodes table block MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500169 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
170 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
171 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
172 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
173 __u32 bg_reserved2[3];
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700174};
175
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400176/*
177 * Structure of a flex block group info
178 */
179
180struct flex_groups {
181 __u32 free_inodes;
182 __u32 free_blocks;
183};
184
Andreas Dilger717d50e2007-10-16 18:38:25 -0400185#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
186#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
187#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
188
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700189#ifdef __KERNEL__
Christoph Hellwig3dcf5452008-04-29 18:13:32 -0400190#include "ext4_sb.h"
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700191#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700192/*
193 * Macro-instructions used to manage group descriptors
194 */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700195#define EXT4_MIN_DESC_SIZE 32
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700196#define EXT4_MIN_DESC_SIZE_64BIT 64
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700197#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
198#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700199#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700200# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
201# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
202# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
203# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700204#else
Mingming Cao617ba132006-10-11 01:20:53 -0700205# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700206# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
Mingming Cao617ba132006-10-11 01:20:53 -0700207# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700208#endif
209
210/*
211 * Constants relative to the data blocks
212 */
Mingming Cao617ba132006-10-11 01:20:53 -0700213#define EXT4_NDIR_BLOCKS 12
214#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
215#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
216#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
217#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700218
219/*
220 * Inode flags
221 */
Mingming Cao617ba132006-10-11 01:20:53 -0700222#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
223#define EXT4_UNRM_FL 0x00000002 /* Undelete */
224#define EXT4_COMPR_FL 0x00000004 /* Compress file */
225#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
226#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
227#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
228#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
229#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700230/* Reserved for compression usage... */
Mingming Cao617ba132006-10-11 01:20:53 -0700231#define EXT4_DIRTY_FL 0x00000100
232#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
233#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
234#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700235/* End compression flags --- maybe not all used */
Mingming Cao617ba132006-10-11 01:20:53 -0700236#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
237#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
238#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
239#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
240#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
241#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500242#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
Alex Tomasa86c6182006-10-11 01:21:03 -0700243#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400244#define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500245#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700246
Alex Tomasa86c6182006-10-11 01:21:03 -0700247#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
Aneesh Kumar K.V4db46fc2008-10-08 23:34:06 -0400248#define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700249
250/*
251 * Inode dynamic state flags
252 */
Mingming Cao617ba132006-10-11 01:20:53 -0700253#define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
254#define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
255#define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
Kalpak Shah6dd4ee72007-07-18 09:19:57 -0400256#define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700257
258/* Used to pass group descriptor data when online resize is done */
Mingming Cao617ba132006-10-11 01:20:53 -0700259struct ext4_new_group_input {
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400260 __u32 group; /* Group number for this data */
261 __u64 block_bitmap; /* Absolute block number of block bitmap */
262 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
263 __u64 inode_table; /* Absolute block number of inode table start */
264 __u32 blocks_count; /* Total number of blocks in this group */
265 __u16 reserved_blocks; /* Number of reserved blocks in this group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700266 __u16 unused;
267};
268
Mingming Cao617ba132006-10-11 01:20:53 -0700269/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
270struct ext4_new_group_data {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700271 __u32 group;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700272 __u64 block_bitmap;
273 __u64 inode_bitmap;
274 __u64 inode_table;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700275 __u32 blocks_count;
276 __u16 reserved_blocks;
277 __u16 unused;
278 __u32 free_blocks_count;
279};
280
Amit Aroraa2df2a62007-07-17 21:42:41 -0400281/*
282 * Following is used by preallocation code to tell get_blocks() that we
283 * want uninitialzed extents.
284 */
285#define EXT4_CREATE_UNINITIALIZED_EXT 2
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700286
287/*
288 * ioctl commands
289 */
Mingming Cao617ba132006-10-11 01:20:53 -0700290#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
291#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
292#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
293#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
Mingming Cao617ba132006-10-11 01:20:53 -0700294#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
295#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
Jose R. Santose23291b2007-07-18 08:57:06 -0400296#ifdef CONFIG_JBD2_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700297#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700298#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700299#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
300#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400301#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
302#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
303#define EXT4_IOC_MIGRATE _IO('f', 9)
304 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700305
306/*
307 * ioctl commands in 32 bit emulation
308 */
Mingming Cao617ba132006-10-11 01:20:53 -0700309#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
310#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
311#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
312#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
313#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
314#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
315#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
Jose R. Santose23291b2007-07-18 08:57:06 -0400316#ifdef CONFIG_JBD2_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700317#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700318#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700319#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
320#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700321
322
323/*
324 * Mount options
325 */
Mingming Cao617ba132006-10-11 01:20:53 -0700326struct ext4_mount_options {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700327 unsigned long s_mount_opt;
328 uid_t s_resuid;
329 gid_t s_resgid;
330 unsigned long s_commit_interval;
331#ifdef CONFIG_QUOTA
332 int s_jquota_fmt;
333 char *s_qf_names[MAXQUOTAS];
334#endif
335};
336
337/*
338 * Structure of an inode on the disk
339 */
Mingming Cao617ba132006-10-11 01:20:53 -0700340struct ext4_inode {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700341 __le16 i_mode; /* File mode */
342 __le16 i_uid; /* Low 16 bits of Owner Uid */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500343 __le32 i_size_lo; /* Size in bytes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700344 __le32 i_atime; /* Access time */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400345 __le32 i_ctime; /* Inode Change time */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700346 __le32 i_mtime; /* Modification time */
347 __le32 i_dtime; /* Deletion Time */
348 __le16 i_gid; /* Low 16 bits of Group Id */
349 __le16 i_links_count; /* Links count */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500350 __le32 i_blocks_lo; /* Blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700351 __le32 i_flags; /* File flags */
352 union {
353 struct {
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500354 __le32 l_i_version;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700355 } linux1;
356 struct {
357 __u32 h_i_translator;
358 } hurd1;
359 struct {
360 __u32 m_i_reserved1;
361 } masix1;
362 } osd1; /* OS dependent 1 */
Mingming Cao617ba132006-10-11 01:20:53 -0700363 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700364 __le32 i_generation; /* File version (for NFS) */
Aneesh Kumar K.V7973c0c2008-01-28 23:58:27 -0500365 __le32 i_file_acl_lo; /* File ACL */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500366 __le32 i_size_high;
Coly Lif077d0d2007-10-16 18:38:25 -0400367 __le32 i_obso_faddr; /* Obsoleted fragment address */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700368 union {
369 struct {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500370 __le16 l_i_blocks_high; /* were l_i_reserved1 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700371 __le16 l_i_file_acl_high;
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400372 __le16 l_i_uid_high; /* these 2 fields */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700373 __le16 l_i_gid_high; /* were reserved2[0] */
374 __u32 l_i_reserved2;
375 } linux2;
376 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400377 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700378 __u16 h_i_mode_high;
379 __u16 h_i_uid_high;
380 __u16 h_i_gid_high;
381 __u32 h_i_author;
382 } hurd2;
383 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400384 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700385 __le16 m_i_file_acl_high;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700386 __u32 m_i_reserved2[2];
387 } masix2;
388 } osd2; /* OS dependent 2 */
389 __le16 i_extra_isize;
390 __le16 i_pad1;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400391 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
392 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
393 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
394 __le32 i_crtime; /* File Creation time */
395 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500396 __le32 i_version_hi; /* high 32 bits for 64-bit version */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700397};
398
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700399
Kalpak Shahef7f3832007-07-18 09:15:20 -0400400#define EXT4_EPOCH_BITS 2
401#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
402#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
403
404/*
405 * Extended fields will fit into an inode if the filesystem was formatted
406 * with large inodes (-I 256 or larger) and there are not currently any EAs
407 * consuming all of the available space. For new inodes we always reserve
408 * enough space for the kernel's known extended fields, but for inodes
409 * created with an old kernel this might not have been the case. None of
410 * the extended inode fields is critical for correct filesystem operation.
411 * This macro checks if a certain field fits in the inode. Note that
412 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
413 */
414#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
415 ((offsetof(typeof(*ext4_inode), field) + \
416 sizeof((ext4_inode)->field)) \
417 <= (EXT4_GOOD_OLD_INODE_SIZE + \
418 (einode)->i_extra_isize)) \
419
420static inline __le32 ext4_encode_extra_time(struct timespec *time)
421{
422 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
423 time->tv_sec >> 32 : 0) |
424 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
425}
426
427static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
428{
429 if (sizeof(time->tv_sec) > 4)
430 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
431 << 32;
432 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
433}
434
435#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
436do { \
437 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
438 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
439 (raw_inode)->xtime ## _extra = \
440 ext4_encode_extra_time(&(inode)->xtime); \
441} while (0)
442
443#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
444do { \
445 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
446 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
447 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
448 (raw_inode)->xtime ## _extra = \
449 ext4_encode_extra_time(&(einode)->xtime); \
450} while (0)
451
452#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
453do { \
454 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
455 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
456 ext4_decode_extra_time(&(inode)->xtime, \
457 raw_inode->xtime ## _extra); \
458} while (0)
459
460#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
461do { \
462 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
463 (einode)->xtime.tv_sec = \
464 (signed)le32_to_cpu((raw_inode)->xtime); \
465 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
466 ext4_decode_extra_time(&(einode)->xtime, \
467 raw_inode->xtime ## _extra); \
468} while (0)
469
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500470#define i_disk_version osd1.linux1.l_i_version
471
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700472#if defined(__KERNEL__) || defined(__linux__)
473#define i_reserved1 osd1.linux1.l_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700474#define i_file_acl_high osd2.linux2.l_i_file_acl_high
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500475#define i_blocks_high osd2.linux2.l_i_blocks_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700476#define i_uid_low i_uid
477#define i_gid_low i_gid
478#define i_uid_high osd2.linux2.l_i_uid_high
479#define i_gid_high osd2.linux2.l_i_gid_high
480#define i_reserved2 osd2.linux2.l_i_reserved2
481
482#elif defined(__GNU__)
483
484#define i_translator osd1.hurd1.h_i_translator
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700485#define i_uid_high osd2.hurd2.h_i_uid_high
486#define i_gid_high osd2.hurd2.h_i_gid_high
487#define i_author osd2.hurd2.h_i_author
488
489#elif defined(__masix__)
490
491#define i_reserved1 osd1.masix1.m_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700492#define i_file_acl_high osd2.masix2.m_i_file_acl_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700493#define i_reserved2 osd2.masix2.m_i_reserved2
494
495#endif /* defined(__KERNEL__) || defined(__linux__) */
496
497/*
498 * File system states
499 */
Mingming Cao617ba132006-10-11 01:20:53 -0700500#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
501#define EXT4_ERROR_FS 0x0002 /* Errors detected */
502#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700503
504/*
Theodore Tso469108f2008-02-10 01:11:44 -0500505 * Misc. filesystem flags
506 */
507#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
508#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
509#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
510
511/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700512 * Mount flags
513 */
Mingming Cao617ba132006-10-11 01:20:53 -0700514#define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
515#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
516#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
517#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
518#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
519#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
520#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
521#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
522#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
523#define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
524#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
525#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
526#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
527#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
528#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
529#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
530#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
531#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
532#define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
533#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
534#define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
535#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
536#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
537#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
Alex Tomasa86c6182006-10-11 01:21:03 -0700538#define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
Girish Shilamkar818d2762008-01-28 23:58:27 -0500539#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
540#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500541#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
Alex Tomas64769242008-07-11 19:27:31 -0400542#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
Mingming Cao617ba132006-10-11 01:20:53 -0700543/* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700544#ifndef _LINUX_EXT2_FS_H
Mingming Cao617ba132006-10-11 01:20:53 -0700545#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
546#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
547#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
548 EXT4_MOUNT_##opt)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700549#else
Mingming Cao617ba132006-10-11 01:20:53 -0700550#define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
551#define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
552#define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700553#endif
554
Mingming Cao617ba132006-10-11 01:20:53 -0700555#define ext4_set_bit ext2_set_bit
556#define ext4_set_bit_atomic ext2_set_bit_atomic
557#define ext4_clear_bit ext2_clear_bit
558#define ext4_clear_bit_atomic ext2_clear_bit_atomic
559#define ext4_test_bit ext2_test_bit
560#define ext4_find_first_zero_bit ext2_find_first_zero_bit
561#define ext4_find_next_zero_bit ext2_find_next_zero_bit
Aneesh Kumar K.Vaa02ad62008-01-28 23:58:27 -0500562#define ext4_find_next_bit ext2_find_next_bit
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700563
564/*
565 * Maximal mount counts between two filesystem checks
566 */
Mingming Cao617ba132006-10-11 01:20:53 -0700567#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
568#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700569
570/*
571 * Behaviour when detecting errors
572 */
Mingming Cao617ba132006-10-11 01:20:53 -0700573#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
574#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
575#define EXT4_ERRORS_PANIC 3 /* Panic */
576#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700577
578/*
579 * Structure of the super block
580 */
Mingming Cao617ba132006-10-11 01:20:53 -0700581struct ext4_super_block {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700582/*00*/ __le32 s_inodes_count; /* Inodes count */
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -0400583 __le32 s_blocks_count_lo; /* Blocks count */
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -0400584 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
585 __le32 s_free_blocks_count_lo; /* Free blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700586/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
587 __le32 s_first_data_block; /* First Data Block */
588 __le32 s_log_block_size; /* Block size */
Coly Lif077d0d2007-10-16 18:38:25 -0400589 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700590/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
Coly Lif077d0d2007-10-16 18:38:25 -0400591 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700592 __le32 s_inodes_per_group; /* # Inodes per group */
593 __le32 s_mtime; /* Mount time */
594/*30*/ __le32 s_wtime; /* Write time */
595 __le16 s_mnt_count; /* Mount count */
596 __le16 s_max_mnt_count; /* Maximal mount count */
597 __le16 s_magic; /* Magic signature */
598 __le16 s_state; /* File system state */
599 __le16 s_errors; /* Behaviour when detecting errors */
600 __le16 s_minor_rev_level; /* minor revision level */
601/*40*/ __le32 s_lastcheck; /* time of last check */
602 __le32 s_checkinterval; /* max. time between checks */
603 __le32 s_creator_os; /* OS */
604 __le32 s_rev_level; /* Revision level */
605/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
606 __le16 s_def_resgid; /* Default gid for reserved blocks */
607 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700608 * These fields are for EXT4_DYNAMIC_REV superblocks only.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700609 *
610 * Note: the difference between the compatible feature set and
611 * the incompatible feature set is that if there is a bit set
612 * in the incompatible feature set that the kernel doesn't
613 * know about, it should refuse to mount the filesystem.
614 *
615 * e2fsck's requirements are more strict; if it doesn't know
616 * about a feature in either the compatible or incompatible
617 * feature set, it must abort and not try to meddle with
618 * things it doesn't understand...
619 */
620 __le32 s_first_ino; /* First non-reserved inode */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700621 __le16 s_inode_size; /* size of inode structure */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700622 __le16 s_block_group_nr; /* block group # of this superblock */
623 __le32 s_feature_compat; /* compatible feature set */
624/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
625 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
626/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
627/*78*/ char s_volume_name[16]; /* volume name */
628/*88*/ char s_last_mounted[64]; /* directory where last mounted */
629/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
630 /*
631 * Performance hints. Directory preallocation should only
Mingming Cao617ba132006-10-11 01:20:53 -0700632 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700633 */
634 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
635 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
636 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
637 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700638 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700639 */
640/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
641/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
642 __le32 s_journal_dev; /* device number of journal file */
643 __le32 s_last_orphan; /* start of list of inodes to delete */
644 __le32 s_hash_seed[4]; /* HTREE hash seed */
645 __u8 s_def_hash_version; /* Default hash version to use */
646 __u8 s_reserved_char_pad;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700647 __le16 s_desc_size; /* size of group descriptor */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700648/*100*/ __le32 s_default_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700649 __le32 s_first_meta_bg; /* First metablock block group */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700650 __le32 s_mkfs_time; /* When the filesystem was created */
651 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
652 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
653/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
654 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
655 __le32 s_free_blocks_count_hi; /* Free blocks count */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -0400656 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
657 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
658 __le32 s_flags; /* Miscellaneous flags */
659 __le16 s_raid_stride; /* RAID stride */
660 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
661 __le64 s_mmp_block; /* Block for multi-mount protection */
662 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400663 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
664 __u8 s_reserved_char_pad2;
665 __le16 s_reserved_pad;
666 __u32 s_reserved[162]; /* Padding to the end of the block */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700667};
668
669#ifdef __KERNEL__
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400670static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700671{
672 return sb->s_fs_info;
673}
Mingming Cao617ba132006-10-11 01:20:53 -0700674static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700675{
Mingming Cao617ba132006-10-11 01:20:53 -0700676 return container_of(inode, struct ext4_inode_info, vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700677}
678
Kalpak Shahef7f3832007-07-18 09:15:20 -0400679static inline struct timespec ext4_current_time(struct inode *inode)
680{
681 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
682 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
683}
684
685
Mingming Cao617ba132006-10-11 01:20:53 -0700686static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700687{
Mingming Cao617ba132006-10-11 01:20:53 -0700688 return ino == EXT4_ROOT_INO ||
689 ino == EXT4_JOURNAL_INO ||
690 ino == EXT4_RESIZE_INO ||
691 (ino >= EXT4_FIRST_INO(sb) &&
692 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700693}
694#else
Mingming Cao617ba132006-10-11 01:20:53 -0700695/* Assume that user mode programs are passing in an ext4fs superblock, not
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700696 * a kernel struct super_block. This will allow us to call the feature-test
697 * macros from user land. */
Mingming Cao617ba132006-10-11 01:20:53 -0700698#define EXT4_SB(sb) (sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700699#endif
700
Mingming Cao617ba132006-10-11 01:20:53 -0700701#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700702
703/*
704 * Codes for operating systems
705 */
Mingming Cao617ba132006-10-11 01:20:53 -0700706#define EXT4_OS_LINUX 0
707#define EXT4_OS_HURD 1
708#define EXT4_OS_MASIX 2
709#define EXT4_OS_FREEBSD 3
710#define EXT4_OS_LITES 4
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700711
712/*
713 * Revision levels
714 */
Mingming Cao617ba132006-10-11 01:20:53 -0700715#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
716#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700717
Mingming Cao617ba132006-10-11 01:20:53 -0700718#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
719#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700720
Mingming Cao617ba132006-10-11 01:20:53 -0700721#define EXT4_GOOD_OLD_INODE_SIZE 128
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700722
723/*
724 * Feature set definitions
725 */
726
Mingming Cao617ba132006-10-11 01:20:53 -0700727#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400728 (EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask))
Mingming Cao617ba132006-10-11 01:20:53 -0700729#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400730 (EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask))
Mingming Cao617ba132006-10-11 01:20:53 -0700731#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400732 (EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask))
Mingming Cao617ba132006-10-11 01:20:53 -0700733#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
734 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
735#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
736 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
737#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
738 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
739#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
740 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
741#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
742 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
743#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
744 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700745
Mingming Cao617ba132006-10-11 01:20:53 -0700746#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
747#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
748#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
749#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
750#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
751#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700752
Mingming Cao617ba132006-10-11 01:20:53 -0700753#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
754#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
755#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500756#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
Andreas Dilger717d50e2007-10-16 18:38:25 -0400757#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400758#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
Kalpak Shahef7f3832007-07-18 09:15:20 -0400759#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700760
Mingming Cao617ba132006-10-11 01:20:53 -0700761#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
762#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
763#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
764#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
765#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
Alex Tomasa86c6182006-10-11 01:21:03 -0700766#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700767#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500768#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
Jose R. Santosce421582007-10-16 18:38:25 -0400769#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700770
Mingming Cao617ba132006-10-11 01:20:53 -0700771#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
772#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
773 EXT4_FEATURE_INCOMPAT_RECOVER| \
Alex Tomasa86c6182006-10-11 01:21:03 -0700774 EXT4_FEATURE_INCOMPAT_META_BG| \
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700775 EXT4_FEATURE_INCOMPAT_EXTENTS| \
Jose R. Santosce421582007-10-16 18:38:25 -0400776 EXT4_FEATURE_INCOMPAT_64BIT| \
777 EXT4_FEATURE_INCOMPAT_FLEX_BG)
Mingming Cao617ba132006-10-11 01:20:53 -0700778#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
779 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
Andreas Dilger717d50e2007-10-16 18:38:25 -0400780 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400781 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
Kalpak Shahef7f3832007-07-18 09:15:20 -0400782 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500783 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
784 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700785
786/*
787 * Default values for user and/or group using reserved blocks
788 */
Mingming Cao617ba132006-10-11 01:20:53 -0700789#define EXT4_DEF_RESUID 0
790#define EXT4_DEF_RESGID 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700791
Theodore Ts'o240799c2008-10-09 23:53:47 -0400792#define EXT4_DEF_INODE_READAHEAD_BLKS 32
793
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700794/*
795 * Default mount options
796 */
Mingming Cao617ba132006-10-11 01:20:53 -0700797#define EXT4_DEFM_DEBUG 0x0001
798#define EXT4_DEFM_BSDGROUPS 0x0002
799#define EXT4_DEFM_XATTR_USER 0x0004
800#define EXT4_DEFM_ACL 0x0008
801#define EXT4_DEFM_UID16 0x0010
802#define EXT4_DEFM_JMODE 0x0060
803#define EXT4_DEFM_JMODE_DATA 0x0020
804#define EXT4_DEFM_JMODE_ORDERED 0x0040
805#define EXT4_DEFM_JMODE_WBACK 0x0060
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700806
807/*
808 * Structure of a directory entry
809 */
Mingming Cao617ba132006-10-11 01:20:53 -0700810#define EXT4_NAME_LEN 255
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700811
Mingming Cao617ba132006-10-11 01:20:53 -0700812struct ext4_dir_entry {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700813 __le32 inode; /* Inode number */
814 __le16 rec_len; /* Directory entry length */
815 __le16 name_len; /* Name length */
Mingming Cao617ba132006-10-11 01:20:53 -0700816 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700817};
818
819/*
Mingming Cao617ba132006-10-11 01:20:53 -0700820 * The new version of the directory entry. Since EXT4 structures are
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700821 * stored in intel byte order, and the name_len field could never be
822 * bigger than 255 chars, it's safe to reclaim the extra byte for the
823 * file_type field.
824 */
Mingming Cao617ba132006-10-11 01:20:53 -0700825struct ext4_dir_entry_2 {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700826 __le32 inode; /* Inode number */
827 __le16 rec_len; /* Directory entry length */
828 __u8 name_len; /* Name length */
829 __u8 file_type;
Mingming Cao617ba132006-10-11 01:20:53 -0700830 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700831};
832
833/*
Mingming Cao617ba132006-10-11 01:20:53 -0700834 * Ext4 directory file types. Only the low 3 bits are used. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700835 * other bits are reserved for now.
836 */
Mingming Cao617ba132006-10-11 01:20:53 -0700837#define EXT4_FT_UNKNOWN 0
838#define EXT4_FT_REG_FILE 1
839#define EXT4_FT_DIR 2
840#define EXT4_FT_CHRDEV 3
841#define EXT4_FT_BLKDEV 4
842#define EXT4_FT_FIFO 5
843#define EXT4_FT_SOCK 6
844#define EXT4_FT_SYMLINK 7
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700845
Mingming Cao617ba132006-10-11 01:20:53 -0700846#define EXT4_FT_MAX 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700847
848/*
Mingming Cao617ba132006-10-11 01:20:53 -0700849 * EXT4_DIR_PAD defines the directory entries boundaries
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700850 *
851 * NOTE: It must be a multiple of 4
852 */
Mingming Cao617ba132006-10-11 01:20:53 -0700853#define EXT4_DIR_PAD 4
854#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
855#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
856 ~EXT4_DIR_ROUND)
Jan Karaa72d7f82008-01-28 23:58:27 -0500857#define EXT4_MAX_REC_LEN ((1<<16)-1)
858
859static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
860{
861 unsigned len = le16_to_cpu(dlen);
862
863 if (len == EXT4_MAX_REC_LEN)
864 return 1 << 16;
865 return len;
866}
867
868static inline __le16 ext4_rec_len_to_disk(unsigned len)
869{
870 if (len == (1 << 16))
871 return cpu_to_le16(EXT4_MAX_REC_LEN);
872 else if (len > (1 << 16))
873 BUG();
874 return cpu_to_le16(len);
875}
876
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700877/*
878 * Hash Tree Directory indexing
879 * (c) Daniel Phillips, 2001
880 */
881
Eric Sandeen4074fe32007-10-16 18:38:25 -0400882#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
883 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
Mingming Cao617ba132006-10-11 01:20:53 -0700884 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
885#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
886#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700887
888/* Legal values for the dx_root hash_version field: */
889
890#define DX_HASH_LEGACY 0
891#define DX_HASH_HALF_MD4 1
892#define DX_HASH_TEA 2
893
894#ifdef __KERNEL__
895
896/* hash info structure used by the directory hash */
897struct dx_hash_info
898{
899 u32 hash;
900 u32 minor_hash;
901 int hash_version;
902 u32 *seed;
903};
904
Mingming Cao617ba132006-10-11 01:20:53 -0700905#define EXT4_HTREE_EOF 0x7fffffff
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700906
907/*
Mingming Cao617ba132006-10-11 01:20:53 -0700908 * Control parameters used by ext4_htree_next_block
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700909 */
910#define HASH_NB_ALWAYS 1
911
912
913/*
914 * Describe an inode's exact location on disk and in memory
915 */
Mingming Cao617ba132006-10-11 01:20:53 -0700916struct ext4_iloc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700917{
918 struct buffer_head *bh;
919 unsigned long offset;
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500920 ext4_group_t block_group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700921};
922
Mingming Cao617ba132006-10-11 01:20:53 -0700923static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700924{
Mingming Cao617ba132006-10-11 01:20:53 -0700925 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700926}
927
928/*
929 * This structure is stuffed into the struct file's private_data field
930 * for directories. It is where we put information so that we can do
931 * readdir operations in hash tree order.
932 */
933struct dir_private_info {
934 struct rb_root root;
935 struct rb_node *curr_node;
936 struct fname *extra_fname;
937 loff_t last_pos;
938 __u32 curr_hash;
939 __u32 curr_minor_hash;
940 __u32 next_hash;
941};
942
943/* calculate the first block number of the group */
Mingming Cao617ba132006-10-11 01:20:53 -0700944static inline ext4_fsblk_t
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500945ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700946{
Mingming Cao617ba132006-10-11 01:20:53 -0700947 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
948 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700949}
950
951/*
952 * Special error return code only used by dx_probe() and its callers.
953 */
954#define ERR_BAD_DX_DIR -75000
955
Andrew Morton72b64b52006-10-11 01:21:18 -0700956void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
957 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
Mingming Cao3a5b2ec2006-10-11 01:21:05 -0700958
Theodore Ts'o9f6200b2008-09-23 09:18:24 -0400959extern struct proc_dir_entry *ext4_proc_root;
960
Theodore Ts'o5e8814f2008-09-23 18:07:35 -0400961#ifdef CONFIG_PROC_FS
962extern const struct file_operations ext4_ui_proc_fops;
963
964#define EXT4_PROC_HANDLER(name, var) \
965do { \
966 proc = proc_create_data(name, mode, sbi->s_proc, \
967 &ext4_ui_proc_fops, &sbi->s_##var); \
968 if (proc == NULL) { \
969 printk(KERN_ERR "EXT4-fs: can't create %s\n", name); \
970 goto err_out; \
971 } \
972} while (0)
973#else
974#define EXT4_PROC_HANDLER(name, var)
975#endif
976
Mingming Cao3a5b2ec2006-10-11 01:21:05 -0700977/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700978 * Function prototypes
979 */
980
981/*
982 * Ok, these declarations are also in <linux/kernel.h> but none of the
Mingming Cao617ba132006-10-11 01:20:53 -0700983 * ext4 source programs needs to include it so they are duplicated here.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700984 */
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400985# define NORET_TYPE /**/
986# define ATTRIB_NORET __attribute__((noreturn))
987# define NORET_AND noreturn,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700988
989/* balloc.c */
Mingming Cao3a5b2ec2006-10-11 01:21:05 -0700990extern unsigned int ext4_block_group(struct super_block *sb,
991 ext4_fsblk_t blocknr);
992extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
993 ext4_fsblk_t blocknr);
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500994extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
995extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
996 ext4_group_t group);
Aneesh Kumar K.V7061eba2008-07-11 19:27:31 -0400997extern ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode,
Mingming Cao617ba132006-10-11 01:20:53 -0700998 ext4_fsblk_t goal, int *errp);
Aneesh Kumar K.V7061eba2008-07-11 19:27:31 -0400999extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
Mingming Cao617ba132006-10-11 01:20:53 -07001000 ext4_fsblk_t goal, unsigned long *count, int *errp);
Aneesh Kumar K.V7061eba2008-07-11 19:27:31 -04001001extern ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
1002 ext4_lblk_t iblock, ext4_fsblk_t goal,
1003 unsigned long *count, int *errp);
Aneesh Kumar K.V5c791612008-10-08 23:12:24 -04001004extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
Mingming Cao07031432008-07-11 19:27:31 -04001005extern ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
Aneesh Kumar K.V5c791612008-10-08 23:12:24 -04001006 s64 nblocks);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001007extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
Alex Tomasc9de5602008-01-29 00:19:52 -05001008 ext4_fsblk_t block, unsigned long count, int metadata);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001009extern void ext4_free_blocks_sb(handle_t *handle, struct super_block *sb,
1010 ext4_fsblk_t block, unsigned long count,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001011 unsigned long *pdquot_freed_blocks);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001012extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1013extern void ext4_check_blocks_bitmap(struct super_block *);
Mingming Cao617ba132006-10-11 01:20:53 -07001014extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001015 ext4_group_t block_group,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001016 struct buffer_head ** bh);
Mingming Cao617ba132006-10-11 01:20:53 -07001017extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001018
1019/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001020extern int ext4_check_dir_entry(const char *, struct inode *,
1021 struct ext4_dir_entry_2 *,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001022 struct buffer_head *, unsigned long);
Mingming Cao617ba132006-10-11 01:20:53 -07001023extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001024 __u32 minor_hash,
Mingming Cao617ba132006-10-11 01:20:53 -07001025 struct ext4_dir_entry_2 *dirent);
1026extern void ext4_htree_free_dir_info(struct dir_private_info *p);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001027
1028/* fsync.c */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001029extern int ext4_sync_file(struct file *, struct dentry *, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001030
1031/* hash.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001032extern int ext4fs_dirhash(const char *name, int len, struct
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001033 dx_hash_info *hinfo);
1034
1035/* ialloc.c */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001036extern struct inode * ext4_new_inode(handle_t *, struct inode *, int);
1037extern void ext4_free_inode(handle_t *, struct inode *);
1038extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1039extern unsigned long ext4_count_free_inodes(struct super_block *);
1040extern unsigned long ext4_count_dirs(struct super_block *);
1041extern void ext4_check_inodes_bitmap(struct super_block *);
1042extern unsigned long ext4_count_free(struct buffer_head *, unsigned);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001043
Alex Tomasc9de5602008-01-29 00:19:52 -05001044/* mballoc.c */
1045extern long ext4_mb_stats;
1046extern long ext4_mb_max_to_scan;
1047extern int ext4_mb_init(struct super_block *, int);
1048extern int ext4_mb_release(struct super_block *);
1049extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1050 struct ext4_allocation_request *, int *);
1051extern int ext4_mb_reserve_blocks(struct super_block *, int);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04001052extern void ext4_discard_preallocations(struct inode *);
Alex Tomasc9de5602008-01-29 00:19:52 -05001053extern int __init init_ext4_mballoc(void);
1054extern void exit_ext4_mballoc(void);
1055extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1056 unsigned long, unsigned long, int, unsigned long *);
Frederic Bohe5f21b0e2008-07-11 19:27:31 -04001057extern int ext4_mb_add_more_groupinfo(struct super_block *sb,
1058 ext4_group_t i, struct ext4_group_desc *desc);
1059extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1060 ext4_grpblk_t add);
Alex Tomasc9de5602008-01-29 00:19:52 -05001061
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001062
1063/* inode.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001064int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1065 struct buffer_head *bh, ext4_fsblk_t blocknr);
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001066struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1067 ext4_lblk_t, int, int *);
1068struct buffer_head *ext4_bread(handle_t *, struct inode *,
1069 ext4_lblk_t, int, int *);
Mingming Cao617ba132006-10-11 01:20:53 -07001070int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001071 ext4_lblk_t iblock, unsigned long maxblocks,
1072 struct buffer_head *bh_result,
1073 int create, int extend_disksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001074
David Howells1d1fe1e2008-02-07 00:15:37 -08001075extern struct inode *ext4_iget(struct super_block *, unsigned long);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001076extern int ext4_write_inode(struct inode *, int);
1077extern int ext4_setattr(struct dentry *, struct iattr *);
Mingming Cao3e3398a2008-07-11 19:27:31 -04001078extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1079 struct kstat *stat);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001080extern void ext4_delete_inode(struct inode *);
1081extern int ext4_sync_inode(handle_t *, struct inode *);
Mingming Cao617ba132006-10-11 01:20:53 -07001082extern void ext4_dirty_inode(struct inode *);
1083extern int ext4_change_inode_journal_flag(struct inode *, int);
1084extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
Duane Griffin91ef4ca2008-07-11 19:27:31 -04001085extern int ext4_can_truncate(struct inode *inode);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001086extern void ext4_truncate(struct inode *);
Mingming Cao617ba132006-10-11 01:20:53 -07001087extern void ext4_set_inode_flags(struct inode *);
Jan Karaff9ddf72007-07-18 09:24:20 -04001088extern void ext4_get_inode_flags(struct ext4_inode_info *);
Mingming Cao617ba132006-10-11 01:20:53 -07001089extern void ext4_set_aops(struct inode *inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07001090extern int ext4_writepage_trans_blocks(struct inode *);
Mingming Caoa02908f2008-08-19 22:16:07 -04001091extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
Mingming Caof3bd1f32008-08-19 22:16:03 -04001092extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
Jan Karacf108bc2008-07-11 19:27:31 -04001093extern int ext4_block_truncate_page(handle_t *handle,
Alex Tomasa86c6182006-10-11 01:21:03 -07001094 struct address_space *mapping, loff_t from);
Aneesh Kumar K.V2e9ee852008-07-11 19:27:31 -04001095extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001096
1097/* ioctl.c */
Andi Kleen5cdd7b22008-04-29 22:03:54 -04001098extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001099extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001100
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -05001101/* migrate.c */
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -04001102extern int ext4_ext_migrate(struct inode *);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001103/* namei.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001104extern int ext4_orphan_add(handle_t *, struct inode *);
1105extern int ext4_orphan_del(handle_t *, struct inode *);
1106extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001107 __u32 start_minor_hash, __u32 *next_hash);
1108
1109/* resize.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001110extern int ext4_group_add(struct super_block *sb,
1111 struct ext4_new_group_data *input);
1112extern int ext4_group_extend(struct super_block *sb,
1113 struct ext4_super_block *es,
1114 ext4_fsblk_t n_blocks_count);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001115
1116/* super.c */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001117extern void ext4_error(struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001118 __attribute__ ((format (printf, 3, 4)));
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001119extern void __ext4_std_error(struct super_block *, const char *, int);
1120extern void ext4_abort(struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001121 __attribute__ ((format (printf, 3, 4)));
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001122extern void ext4_warning(struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001123 __attribute__ ((format (printf, 3, 4)));
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001124extern void ext4_update_dynamic_rev(struct super_block *sb);
Aneesh Kumar K.V99e6f822008-01-28 23:58:27 -05001125extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1126 __u32 compat);
1127extern int ext4_update_rocompat_feature(handle_t *handle,
1128 struct super_block *sb, __u32 rocompat);
1129extern int ext4_update_incompat_feature(handle_t *handle,
1130 struct super_block *sb, __u32 incompat);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001131extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1132 struct ext4_group_desc *bg);
1133extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1134 struct ext4_group_desc *bg);
1135extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1136 struct ext4_group_desc *bg);
1137extern void ext4_block_bitmap_set(struct super_block *sb,
1138 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1139extern void ext4_inode_bitmap_set(struct super_block *sb,
1140 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1141extern void ext4_inode_table_set(struct super_block *sb,
1142 struct ext4_group_desc *bg, ext4_fsblk_t blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001143
1144static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1145{
1146 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001147 le32_to_cpu(es->s_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001148}
1149
1150static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1151{
1152 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001153 le32_to_cpu(es->s_r_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001154}
1155
1156static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1157{
1158 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001159 le32_to_cpu(es->s_free_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001160}
1161
1162static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1163 ext4_fsblk_t blk)
1164{
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001165 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001166 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1167}
1168
1169static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1170 ext4_fsblk_t blk)
1171{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001172 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001173 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1174}
1175
1176static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1177 ext4_fsblk_t blk)
1178{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001179 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001180 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1181}
1182
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001183static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1184{
1185 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1186 le32_to_cpu(raw_inode->i_size_lo);
1187}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001188
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001189static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1190{
1191 raw_inode->i_size_lo = cpu_to_le32(i_size);
1192 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1193}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001194
Alex Tomasc9de5602008-01-29 00:19:52 -05001195static inline
1196struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001197 ext4_group_t group)
Alex Tomasc9de5602008-01-29 00:19:52 -05001198{
1199 struct ext4_group_info ***grp_info;
1200 long indexv, indexh;
1201 grp_info = EXT4_SB(sb)->s_group_info;
1202 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1203 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1204 return grp_info[indexv][indexh];
1205}
1206
1207
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001208static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1209 ext4_group_t block_group)
1210{
1211 return block_group >> sbi->s_log_groups_per_flex;
1212}
1213
1214static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1215{
1216 return 1 << sbi->s_log_groups_per_flex;
1217}
1218
Mingming Cao617ba132006-10-11 01:20:53 -07001219#define ext4_std_error(sb, errno) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001220do { \
1221 if ((errno)) \
Stoyan Gaydarov4db9c542008-07-13 21:03:29 -04001222 __ext4_std_error((sb), __func__, (errno)); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001223} while (0)
1224
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04001225#ifdef CONFIG_SMP
1226/* Each CPU can accumulate FBC_BATCH blocks in their local
1227 * counters. So we need to make sure we have free blocks more
1228 * than FBC_BATCH * nr_cpu_ids. Also add a window of 4 times.
1229 */
1230#define EXT4_FREEBLOCKS_WATERMARK (4 * (FBC_BATCH * nr_cpu_ids))
1231#else
1232#define EXT4_FREEBLOCKS_WATERMARK 0
1233#endif
1234
Aneesh Kumar K.Vcf17fea2008-09-13 13:06:18 -04001235static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1236{
1237 /*
1238 * XXX: replace with spinlock if seen contended -bzzz
1239 */
1240 down_write(&EXT4_I(inode)->i_data_sem);
1241 if (newsize > EXT4_I(inode)->i_disksize)
1242 EXT4_I(inode)->i_disksize = newsize;
1243 up_write(&EXT4_I(inode)->i_data_sem);
1244 return ;
1245}
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04001246
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001247/*
1248 * Inodes and files operations
1249 */
1250
1251/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001252extern const struct file_operations ext4_dir_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001253
1254/* file.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001255extern const struct inode_operations ext4_file_inode_operations;
Mingming Cao617ba132006-10-11 01:20:53 -07001256extern const struct file_operations ext4_file_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001257
1258/* namei.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001259extern const struct inode_operations ext4_dir_inode_operations;
1260extern const struct inode_operations ext4_special_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001261
1262/* symlink.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001263extern const struct inode_operations ext4_symlink_inode_operations;
1264extern const struct inode_operations ext4_fast_symlink_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001265
Alex Tomasa86c6182006-10-11 01:21:03 -07001266/* extents.c */
1267extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1268extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
Mingming Caoa02908f2008-08-19 22:16:07 -04001269extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1270 int chunk);
Alex Tomasa86c6182006-10-11 01:21:03 -07001271extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001272 ext4_lblk_t iblock,
Alex Tomasa86c6182006-10-11 01:21:03 -07001273 unsigned long max_blocks, struct buffer_head *bh_result,
1274 int create, int extend_disksize);
Jan Karacf108bc2008-07-11 19:27:31 -04001275extern void ext4_ext_truncate(struct inode *);
Alex Tomasa86c6182006-10-11 01:21:03 -07001276extern void ext4_ext_init(struct super_block *);
1277extern void ext4_ext_release(struct super_block *);
Amit Aroraa2df2a62007-07-17 21:42:41 -04001278extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1279 loff_t len);
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -05001280extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1281 sector_t block, unsigned long max_blocks,
1282 struct buffer_head *bh, int create,
Mingming Caod2a17632008-07-14 17:52:37 -04001283 int extend_disksize, int flag);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001284#endif /* __KERNEL__ */
1285
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04001286#endif /* _EXT4_H */