blob: 889ec9d5e6adfe5b62acf19b29fd37a7faf69f08 [file] [log] [blame]
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>
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -050022#include <linux/jbd2.h>
Mingming Cao60e58e02009-01-22 18:13:05 +010023#include <linux/quota.h>
Theodore Ts'od444c3c2009-05-01 13:44:33 -040024#include <linux/rwsem.h>
25#include <linux/rbtree.h>
26#include <linux/seqlock.h>
27#include <linux/mutex.h>
Theodore Ts'oca0faba2009-05-03 16:33:44 -040028#include <linux/timer.h>
29#include <linux/wait.h>
30#include <linux/blockgroup_lock.h>
31#include <linux/percpu_counter.h>
Ben Hutchings4d92dc02010-05-17 06:00:00 -040032#ifdef __KERNEL__
33#include <linux/compat.h>
34#endif
Alex Tomasc9de5602008-01-29 00:19:52 -050035
Dave Kleikampac27a0e2006-10-11 01:20:50 -070036/*
Shen Feng8a356942008-07-11 19:27:31 -040037 * The fourth extended filesystem constants/structures
Dave Kleikampac27a0e2006-10-11 01:20:50 -070038 */
39
40/*
Mingming Cao617ba132006-10-11 01:20:53 -070041 * Define EXT4FS_DEBUG to produce debug messages
Dave Kleikampac27a0e2006-10-11 01:20:50 -070042 */
Mingming Cao617ba132006-10-11 01:20:53 -070043#undef EXT4FS_DEBUG
Dave Kleikampac27a0e2006-10-11 01:20:50 -070044
45/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -070046 * Debug code
47 */
Mingming Cao617ba132006-10-11 01:20:53 -070048#ifdef EXT4FS_DEBUG
49#define ext4_debug(f, a...) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070050 do { \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040051 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
Stoyan Gaydarov4db9c542008-07-13 21:03:29 -040052 __FILE__, __LINE__, __func__); \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040053 printk(KERN_DEBUG f, ## a); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070054 } while (0)
55#else
Mingming Cao617ba132006-10-11 01:20:53 -070056#define ext4_debug(f, a...) do {} while (0)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070057#endif
58
Frank Mayhar273df552010-03-02 11:46:09 -050059#define EXT4_ERROR_INODE(inode, fmt, a...) \
Theodore Ts'oc398eda2010-07-27 11:56:40 -040060 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
61
62#define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
63 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
Frank Mayhar273df552010-03-02 11:46:09 -050064
65#define EXT4_ERROR_FILE(file, fmt, a...) \
Theodore Ts'oc398eda2010-07-27 11:56:40 -040066 ext4_error_file(__func__, __LINE__, (file), (fmt), ## a)
Frank Mayhar273df552010-03-02 11:46:09 -050067
Theodore Ts'od444c3c2009-05-01 13:44:33 -040068/* data type for block offset of block group */
69typedef int ext4_grpblk_t;
70
71/* data type for filesystem-wide blocks number */
72typedef unsigned long long ext4_fsblk_t;
73
74/* data type for file logical block number */
75typedef __u32 ext4_lblk_t;
76
77/* data type for block group number */
78typedef unsigned int ext4_group_t;
79
Theodore Ts'o296c3552009-09-30 00:32:42 -040080/*
Theodore Ts'o60e66792010-05-17 07:00:00 -040081 * Flags used in mballoc's allocation_context flags field.
Theodore Ts'o296c3552009-09-30 00:32:42 -040082 *
83 * Also used to show what's going on for debugging purposes when the
84 * flag field is exported via the traceport interface
85 */
Theodore Ts'od444c3c2009-05-01 13:44:33 -040086
Alex Tomasc9de5602008-01-29 00:19:52 -050087/* prefer goal again. length */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040088#define EXT4_MB_HINT_MERGE 0x0001
Alex Tomasc9de5602008-01-29 00:19:52 -050089/* blocks already reserved */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040090#define EXT4_MB_HINT_RESERVED 0x0002
Alex Tomasc9de5602008-01-29 00:19:52 -050091/* metadata is being allocated */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040092#define EXT4_MB_HINT_METADATA 0x0004
Alex Tomasc9de5602008-01-29 00:19:52 -050093/* first blocks in the file */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040094#define EXT4_MB_HINT_FIRST 0x0008
Alex Tomasc9de5602008-01-29 00:19:52 -050095/* search for the best chunk */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040096#define EXT4_MB_HINT_BEST 0x0010
Alex Tomasc9de5602008-01-29 00:19:52 -050097/* data is being allocated */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040098#define EXT4_MB_HINT_DATA 0x0020
Alex Tomasc9de5602008-01-29 00:19:52 -050099/* don't preallocate (for tails) */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400100#define EXT4_MB_HINT_NOPREALLOC 0x0040
Alex Tomasc9de5602008-01-29 00:19:52 -0500101/* allocate for locality group */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400102#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
Alex Tomasc9de5602008-01-29 00:19:52 -0500103/* allocate goal blocks or none */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400104#define EXT4_MB_HINT_GOAL_ONLY 0x0100
Alex Tomasc9de5602008-01-29 00:19:52 -0500105/* goal is meaningful */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400106#define EXT4_MB_HINT_TRY_GOAL 0x0200
Mingming Caod2a17632008-07-14 17:52:37 -0400107/* blocks already pre-reserved by delayed allocation */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400108#define EXT4_MB_DELALLOC_RESERVED 0x0400
Theodore Ts'o4ba74d02009-08-09 22:01:13 -0400109/* We are doing stream allocation */
110#define EXT4_MB_STREAM_ALLOC 0x0800
Mingming Caod2a17632008-07-14 17:52:37 -0400111
Alex Tomasc9de5602008-01-29 00:19:52 -0500112
113struct ext4_allocation_request {
114 /* target inode for block we're allocating */
115 struct inode *inode;
Alex Tomasc9de5602008-01-29 00:19:52 -0500116 /* how many blocks we want to allocate */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500117 unsigned int len;
Eric Sandeen726447d2009-07-13 10:24:17 -0400118 /* logical block in target inode */
119 ext4_lblk_t logical;
120 /* the closest logical allocated block to the left */
121 ext4_lblk_t lleft;
122 /* the closest logical allocated block to the right */
123 ext4_lblk_t lright;
124 /* phys. target (a hint) */
125 ext4_fsblk_t goal;
126 /* phys. block for the closest logical allocated block to the left */
127 ext4_fsblk_t pleft;
128 /* phys. block for the closest logical allocated block to the right */
129 ext4_fsblk_t pright;
Alex Tomasc9de5602008-01-29 00:19:52 -0500130 /* flags. see above EXT4_MB_HINT_* */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500131 unsigned int flags;
Alex Tomasc9de5602008-01-29 00:19:52 -0500132};
133
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700134/*
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400135 * Logical to physical block mapping, used by ext4_map_blocks()
136 *
137 * This structure is used to pass requests into ext4_map_blocks() as
138 * well as to store the information returned by ext4_map_blocks(). It
139 * takes less room on the stack than a struct buffer_head.
140 */
141#define EXT4_MAP_NEW (1 << BH_New)
142#define EXT4_MAP_MAPPED (1 << BH_Mapped)
143#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
144#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
145#define EXT4_MAP_UNINIT (1 << BH_Uninit)
146#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
147 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
148 EXT4_MAP_UNINIT)
149
150struct ext4_map_blocks {
151 ext4_fsblk_t m_pblk;
152 ext4_lblk_t m_lblk;
153 unsigned int m_len;
154 unsigned int m_flags;
155};
156
157/*
Theodore Ts'ob3a3ca82009-08-31 23:13:11 -0400158 * For delayed allocation tracking
159 */
160struct mpage_da_data {
161 struct inode *inode;
162 sector_t b_blocknr; /* start block number of extent */
163 size_t b_size; /* size of extent */
164 unsigned long b_state; /* state of the extent */
165 unsigned long first_page, next_page; /* extent of pages */
166 struct writeback_control *wbc;
167 int io_done;
168 int pages_written;
169 int retval;
170};
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500171#define EXT4_IO_UNWRITTEN 0x1
Mingming Cao00314622009-09-28 15:49:08 -0400172typedef struct ext4_io_end {
jiayingz@google.com (Jiaying Zhang)5b3ff232010-07-27 11:56:06 -0400173 struct list_head list; /* per-file finished IO list */
Mingming Cao00314622009-09-28 15:49:08 -0400174 struct inode *inode; /* file being written to */
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400175 unsigned int flag; /* unwritten or not */
Jiaying Zhang744692d2010-03-04 16:14:02 -0500176 struct page *page; /* page struct for buffer write */
Eric Sandeena1de02d2010-02-04 23:58:38 -0500177 loff_t offset; /* offset in the file */
178 ssize_t size; /* size of the extent */
Mingming Cao00314622009-09-28 15:49:08 -0400179 struct work_struct work; /* data work queue */
jiayingz@google.com (Jiaying Zhang)5b3ff232010-07-27 11:56:06 -0400180 struct kiocb *iocb; /* iocb struct for AIO */
181 int result; /* error value for AIO */
Mingming Cao00314622009-09-28 15:49:08 -0400182} ext4_io_end_t;
183
Theodore Ts'ob3a3ca82009-08-31 23:13:11 -0400184/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700185 * Special inodes numbers
186 */
Mingming Cao617ba132006-10-11 01:20:53 -0700187#define EXT4_BAD_INO 1 /* Bad blocks inode */
188#define EXT4_ROOT_INO 2 /* Root inode */
189#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
190#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
191#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
192#define EXT4_JOURNAL_INO 8 /* Journal inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700193
Mingming Cao617ba132006-10-11 01:20:53 -0700194/* First non-reserved inode for old ext4 filesystems */
195#define EXT4_GOOD_OLD_FIRST_INO 11
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700196
197/*
198 * Maximal count of links to a file
199 */
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400200#define EXT4_LINK_MAX 65000
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700201
202/*
203 * Macro-instructions used to manage several block sizes
204 */
Mingming Cao617ba132006-10-11 01:20:53 -0700205#define EXT4_MIN_BLOCK_SIZE 1024
Takashi Satoafc7cbc2008-01-28 23:58:27 -0500206#define EXT4_MAX_BLOCK_SIZE 65536
207#define EXT4_MIN_BLOCK_LOG_SIZE 10
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700208#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700209# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700210#else
Mingming Cao617ba132006-10-11 01:20:53 -0700211# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700212#endif
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400213#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700214#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700215# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700216#else
Mingming Cao617ba132006-10-11 01:20:53 -0700217# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700218#endif
219#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700220#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
221#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
222#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700223#else
Mingming Cao617ba132006-10-11 01:20:53 -0700224#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
225 EXT4_GOOD_OLD_INODE_SIZE : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700226 (s)->s_inode_size)
Mingming Cao617ba132006-10-11 01:20:53 -0700227#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
228 EXT4_GOOD_OLD_FIRST_INO : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700229 (s)->s_first_ino)
230#endif
Amit Aroraa2df2a62007-07-17 21:42:41 -0400231#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700232
233/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700234 * Structure of a blocks group descriptor
235 */
Mingming Cao617ba132006-10-11 01:20:53 -0700236struct ext4_group_desc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700237{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400238 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400239 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
240 __le32 bg_inode_table_lo; /* Inodes table block */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500241 __le16 bg_free_blocks_count_lo;/* Free blocks count */
242 __le16 bg_free_inodes_count_lo;/* Free inodes count */
243 __le16 bg_used_dirs_count_lo; /* Directories count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400244 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
245 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500246 __le16 bg_itable_unused_lo; /* Unused inodes count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400247 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700248 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
249 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
250 __le32 bg_inode_table_hi; /* Inodes table block MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500251 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
252 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
253 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500254 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500255 __u32 bg_reserved2[3];
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700256};
257
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400258/*
259 * Structure of a flex block group info
260 */
261
262struct flex_groups {
Theodore Ts'o9f24e422009-03-04 19:09:10 -0500263 atomic_t free_inodes;
264 atomic_t free_blocks;
Theodore Ts'o7d39db12009-03-04 19:31:53 -0500265 atomic_t used_dirs;
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400266};
267
Andreas Dilger717d50e2007-10-16 18:38:25 -0400268#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
269#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
270#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
271
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700272/*
273 * Macro-instructions used to manage group descriptors
274 */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700275#define EXT4_MIN_DESC_SIZE 32
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700276#define EXT4_MIN_DESC_SIZE_64BIT 64
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700277#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
278#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700279#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700280# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
281# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
282# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
283# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700284#else
Mingming Cao617ba132006-10-11 01:20:53 -0700285# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700286# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
Mingming Cao617ba132006-10-11 01:20:53 -0700287# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700288#endif
289
290/*
291 * Constants relative to the data blocks
292 */
Mingming Cao617ba132006-10-11 01:20:53 -0700293#define EXT4_NDIR_BLOCKS 12
294#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
295#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
296#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
297#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700298
299/*
300 * Inode flags
301 */
Mingming Cao617ba132006-10-11 01:20:53 -0700302#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
303#define EXT4_UNRM_FL 0x00000002 /* Undelete */
304#define EXT4_COMPR_FL 0x00000004 /* Compress file */
305#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
306#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
307#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
308#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
309#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700310/* Reserved for compression usage... */
Mingming Cao617ba132006-10-11 01:20:53 -0700311#define EXT4_DIRTY_FL 0x00000100
312#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
313#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
314#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700315/* End compression flags --- maybe not all used */
Mingming Cao617ba132006-10-11 01:20:53 -0700316#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
317#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
318#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
319#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
320#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
321#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500322#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
Alex Tomasa86c6182006-10-11 01:21:03 -0700323#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
Theodore Ts'of710b4b2010-01-25 03:31:32 -0500324#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
Jiaying Zhangc8d46e42010-02-24 09:52:53 -0500325#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500326#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700327
Jiaying Zhangc8d46e42010-02-24 09:52:53 -0500328#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
329#define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700330
Duane Griffin8fa43a82009-02-15 18:57:26 -0500331/* Flags that should be inherited by new inodes from their parent. */
332#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
333 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
334 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
335 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
336 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
337
Duane Griffin2dc6b0d2009-02-15 18:09:20 -0500338/* Flags that are appropriate for regular files (all but dir-specific ones). */
339#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
340
341/* Flags that are appropriate for non-directories/regular files. */
342#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
343
344/* Mask out flags that are inappropriate for the given type of inode. */
345static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
346{
347 if (S_ISDIR(mode))
348 return flags;
349 else if (S_ISREG(mode))
350 return flags & EXT4_REG_FLMASK;
351 else
352 return flags & EXT4_OTHER_FLMASK;
353}
354
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400355/*
356 * Inode flags used for atomic set/get
357 */
358enum {
359 EXT4_INODE_SECRM = 0, /* Secure deletion */
360 EXT4_INODE_UNRM = 1, /* Undelete */
361 EXT4_INODE_COMPR = 2, /* Compress file */
362 EXT4_INODE_SYNC = 3, /* Synchronous updates */
363 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
364 EXT4_INODE_APPEND = 5, /* writes to file may only append */
365 EXT4_INODE_NODUMP = 6, /* do not dump file */
366 EXT4_INODE_NOATIME = 7, /* do not update atime */
367/* Reserved for compression usage... */
368 EXT4_INODE_DIRTY = 8,
369 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
370 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
371 EXT4_INODE_ECOMPR = 11, /* Compression error */
372/* End compression flags --- maybe not all used */
373 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
374 EXT4_INODE_IMAGIC = 13, /* AFS directory */
375 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
376 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
377 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
378 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
379 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
380 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
381 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
382 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
383 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
384};
385
386#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
387#define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
388 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
389 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
390
391/*
392 * Since it's pretty easy to mix up bit numbers and hex values, and we
393 * can't do a compile-time test for ENUM values, we use a run-time
394 * test to make sure that EXT4_XXX_FL is consistent with respect to
395 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
396 * out so it won't cost any extra space in the compiled kernel image.
397 * But it's important that these values are the same, since we are
398 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
399 * must be consistent with the values of FS_XXX_FL defined in
400 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
401 * ext4 filesystems, and of course the values defined in e2fsprogs.
402 *
403 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
404 */
405static inline void ext4_check_flag_values(void)
406{
407 CHECK_FLAG_VALUE(SECRM);
408 CHECK_FLAG_VALUE(UNRM);
409 CHECK_FLAG_VALUE(COMPR);
410 CHECK_FLAG_VALUE(SYNC);
411 CHECK_FLAG_VALUE(IMMUTABLE);
412 CHECK_FLAG_VALUE(APPEND);
413 CHECK_FLAG_VALUE(NODUMP);
414 CHECK_FLAG_VALUE(NOATIME);
415 CHECK_FLAG_VALUE(DIRTY);
416 CHECK_FLAG_VALUE(COMPRBLK);
417 CHECK_FLAG_VALUE(NOCOMPR);
418 CHECK_FLAG_VALUE(ECOMPR);
419 CHECK_FLAG_VALUE(INDEX);
420 CHECK_FLAG_VALUE(IMAGIC);
421 CHECK_FLAG_VALUE(JOURNAL_DATA);
422 CHECK_FLAG_VALUE(NOTAIL);
423 CHECK_FLAG_VALUE(DIRSYNC);
424 CHECK_FLAG_VALUE(TOPDIR);
425 CHECK_FLAG_VALUE(HUGE_FILE);
426 CHECK_FLAG_VALUE(EXTENTS);
427 CHECK_FLAG_VALUE(EA_INODE);
428 CHECK_FLAG_VALUE(EOFBLOCKS);
429 CHECK_FLAG_VALUE(RESERVED);
430}
431
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700432/* Used to pass group descriptor data when online resize is done */
Mingming Cao617ba132006-10-11 01:20:53 -0700433struct ext4_new_group_input {
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400434 __u32 group; /* Group number for this data */
435 __u64 block_bitmap; /* Absolute block number of block bitmap */
436 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
437 __u64 inode_table; /* Absolute block number of inode table start */
438 __u32 blocks_count; /* Total number of blocks in this group */
439 __u16 reserved_blocks; /* Number of reserved blocks in this group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700440 __u16 unused;
441};
442
Ben Hutchings4d92dc02010-05-17 06:00:00 -0400443#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
444struct compat_ext4_new_group_input {
445 u32 group;
446 compat_u64 block_bitmap;
447 compat_u64 inode_bitmap;
448 compat_u64 inode_table;
449 u32 blocks_count;
450 u16 reserved_blocks;
451 u16 unused;
452};
453#endif
454
Mingming Cao617ba132006-10-11 01:20:53 -0700455/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
456struct ext4_new_group_data {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700457 __u32 group;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700458 __u64 block_bitmap;
459 __u64 inode_bitmap;
460 __u64 inode_table;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700461 __u32 blocks_count;
462 __u16 reserved_blocks;
463 __u16 unused;
464 __u32 free_blocks_count;
465};
466
Amit Aroraa2df2a62007-07-17 21:42:41 -0400467/*
Eric Sandeen79e83032010-07-27 11:56:07 -0400468 * Flags used by ext4_map_blocks()
Amit Aroraa2df2a62007-07-17 21:42:41 -0400469 */
Theodore Ts'oc2177052009-05-14 00:58:52 -0400470 /* Allocate any needed blocks and/or convert an unitialized
471 extent to be an initialized ext4 */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400472#define EXT4_GET_BLOCKS_CREATE 0x0001
Theodore Ts'oc2177052009-05-14 00:58:52 -0400473 /* Request the creation of an unitialized extent */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400474#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
Theodore Ts'oc2177052009-05-14 00:58:52 -0400475#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
476 EXT4_GET_BLOCKS_CREATE)
Theodore Ts'oc2177052009-05-14 00:58:52 -0400477 /* Caller is from the delayed allocation writeout path,
Theodore Ts'o60e66792010-05-17 07:00:00 -0400478 so set the magic i_delalloc_reserve_flag after taking the
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400479 inode allocation semaphore for */
Jan Kara03f5d8b2009-06-09 00:17:05 -0400480#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
Mingming Cao00314622009-09-28 15:49:08 -0400481 /* caller is from the direct IO path, request to creation of an
482 unitialized extents if not allocated, split the uninitialized
483 extent if blocks has been preallocated already*/
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500484#define EXT4_GET_BLOCKS_PRE_IO 0x0008
Aneesh Kumar K.V1296cc82010-01-15 01:27:59 -0500485#define EXT4_GET_BLOCKS_CONVERT 0x0010
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500486#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
Mingming Cao00314622009-09-28 15:49:08 -0400487 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500488 /* Convert extent to initialized after IO complete */
489#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
Jiaying Zhang744692d2010-03-04 16:14:02 -0500490 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700491
492/*
Theodore Ts'oe6362602009-11-23 07:17:05 -0500493 * Flags used by ext4_free_blocks
494 */
495#define EXT4_FREE_BLOCKS_METADATA 0x0001
496#define EXT4_FREE_BLOCKS_FORGET 0x0002
Theodore Ts'o1f2acb62010-01-22 17:40:42 -0500497#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
Theodore Ts'oe6362602009-11-23 07:17:05 -0500498
499/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700500 * ioctl commands
501 */
Mingming Cao617ba132006-10-11 01:20:53 -0700502#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
503#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
504#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
505#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
Mingming Cao617ba132006-10-11 01:20:53 -0700506#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
507#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
Jose R. Santose23291b2007-07-18 08:57:06 -0400508#ifdef CONFIG_JBD2_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700509#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700510#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700511#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
512#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400513#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
514#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
515#define EXT4_IOC_MIGRATE _IO('f', 9)
Theodore Ts'occd25062009-02-26 01:04:07 -0500516 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400517 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
Theodore Ts'occd25062009-02-26 01:04:07 -0500518#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
Akira Fujita748de672009-06-17 19:24:03 -0400519#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700520
Ben Hutchings899ad0c2010-05-17 05:00:00 -0400521#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700522/*
523 * ioctl commands in 32 bit emulation
524 */
Mingming Cao617ba132006-10-11 01:20:53 -0700525#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
526#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
527#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
528#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
529#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
530#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
531#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
Ben Hutchings4d92dc02010-05-17 06:00:00 -0400532#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
Jose R. Santose23291b2007-07-18 08:57:06 -0400533#ifdef CONFIG_JBD2_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700534#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700535#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700536#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
537#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
Ben Hutchings899ad0c2010-05-17 05:00:00 -0400538#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700539
540
541/*
542 * Mount options
543 */
Mingming Cao617ba132006-10-11 01:20:53 -0700544struct ext4_mount_options {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700545 unsigned long s_mount_opt;
546 uid_t s_resuid;
547 gid_t s_resgid;
548 unsigned long s_commit_interval;
Theodore Ts'o30773842009-01-03 20:27:38 -0500549 u32 s_min_batch_time, s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700550#ifdef CONFIG_QUOTA
551 int s_jquota_fmt;
552 char *s_qf_names[MAXQUOTAS];
553#endif
554};
555
Eric Sandeenfb0a3872009-09-16 14:45:10 -0400556/* Max physical block we can addres w/o extents */
557#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
558
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700559/*
560 * Structure of an inode on the disk
561 */
Mingming Cao617ba132006-10-11 01:20:53 -0700562struct ext4_inode {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700563 __le16 i_mode; /* File mode */
564 __le16 i_uid; /* Low 16 bits of Owner Uid */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500565 __le32 i_size_lo; /* Size in bytes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700566 __le32 i_atime; /* Access time */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400567 __le32 i_ctime; /* Inode Change time */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700568 __le32 i_mtime; /* Modification time */
569 __le32 i_dtime; /* Deletion Time */
570 __le16 i_gid; /* Low 16 bits of Group Id */
571 __le16 i_links_count; /* Links count */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500572 __le32 i_blocks_lo; /* Blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700573 __le32 i_flags; /* File flags */
574 union {
575 struct {
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500576 __le32 l_i_version;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700577 } linux1;
578 struct {
579 __u32 h_i_translator;
580 } hurd1;
581 struct {
582 __u32 m_i_reserved1;
583 } masix1;
584 } osd1; /* OS dependent 1 */
Mingming Cao617ba132006-10-11 01:20:53 -0700585 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700586 __le32 i_generation; /* File version (for NFS) */
Aneesh Kumar K.V7973c0c2008-01-28 23:58:27 -0500587 __le32 i_file_acl_lo; /* File ACL */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500588 __le32 i_size_high;
Coly Lif077d0d2007-10-16 18:38:25 -0400589 __le32 i_obso_faddr; /* Obsoleted fragment address */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700590 union {
591 struct {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500592 __le16 l_i_blocks_high; /* were l_i_reserved1 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700593 __le16 l_i_file_acl_high;
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400594 __le16 l_i_uid_high; /* these 2 fields */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700595 __le16 l_i_gid_high; /* were reserved2[0] */
596 __u32 l_i_reserved2;
597 } linux2;
598 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400599 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700600 __u16 h_i_mode_high;
601 __u16 h_i_uid_high;
602 __u16 h_i_gid_high;
603 __u32 h_i_author;
604 } hurd2;
605 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400606 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700607 __le16 m_i_file_acl_high;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700608 __u32 m_i_reserved2[2];
609 } masix2;
610 } osd2; /* OS dependent 2 */
611 __le16 i_extra_isize;
612 __le16 i_pad1;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400613 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
614 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
615 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
616 __le32 i_crtime; /* File Creation time */
617 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500618 __le32 i_version_hi; /* high 32 bits for 64-bit version */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700619};
620
Akira Fujita748de672009-06-17 19:24:03 -0400621struct move_extent {
622 __u32 reserved; /* should be zero */
623 __u32 donor_fd; /* donor file descriptor */
624 __u64 orig_start; /* logical start offset in block for orig */
625 __u64 donor_start; /* logical start offset in block for donor */
626 __u64 len; /* block length to be moved */
627 __u64 moved_len; /* moved block length */
628};
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700629
Kalpak Shahef7f3832007-07-18 09:15:20 -0400630#define EXT4_EPOCH_BITS 2
631#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
632#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
633
634/*
635 * Extended fields will fit into an inode if the filesystem was formatted
636 * with large inodes (-I 256 or larger) and there are not currently any EAs
637 * consuming all of the available space. For new inodes we always reserve
638 * enough space for the kernel's known extended fields, but for inodes
639 * created with an old kernel this might not have been the case. None of
640 * the extended inode fields is critical for correct filesystem operation.
641 * This macro checks if a certain field fits in the inode. Note that
642 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
643 */
644#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
645 ((offsetof(typeof(*ext4_inode), field) + \
646 sizeof((ext4_inode)->field)) \
647 <= (EXT4_GOOD_OLD_INODE_SIZE + \
648 (einode)->i_extra_isize)) \
649
650static inline __le32 ext4_encode_extra_time(struct timespec *time)
651{
652 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
Theodore Ts'oc1fccc02009-09-30 01:13:55 -0400653 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
654 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
Kalpak Shahef7f3832007-07-18 09:15:20 -0400655}
656
657static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
658{
659 if (sizeof(time->tv_sec) > 4)
660 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
661 << 32;
Theodore Ts'oc1fccc02009-09-30 01:13:55 -0400662 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400663}
664
665#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
666do { \
667 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
668 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
669 (raw_inode)->xtime ## _extra = \
670 ext4_encode_extra_time(&(inode)->xtime); \
671} while (0)
672
673#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
674do { \
675 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
676 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
677 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
678 (raw_inode)->xtime ## _extra = \
679 ext4_encode_extra_time(&(einode)->xtime); \
680} while (0)
681
682#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
683do { \
684 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
685 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
686 ext4_decode_extra_time(&(inode)->xtime, \
687 raw_inode->xtime ## _extra); \
688} while (0)
689
690#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
691do { \
692 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
693 (einode)->xtime.tv_sec = \
694 (signed)le32_to_cpu((raw_inode)->xtime); \
695 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
696 ext4_decode_extra_time(&(einode)->xtime, \
697 raw_inode->xtime ## _extra); \
698} while (0)
699
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500700#define i_disk_version osd1.linux1.l_i_version
701
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700702#if defined(__KERNEL__) || defined(__linux__)
703#define i_reserved1 osd1.linux1.l_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700704#define i_file_acl_high osd2.linux2.l_i_file_acl_high
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500705#define i_blocks_high osd2.linux2.l_i_blocks_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700706#define i_uid_low i_uid
707#define i_gid_low i_gid
708#define i_uid_high osd2.linux2.l_i_uid_high
709#define i_gid_high osd2.linux2.l_i_gid_high
710#define i_reserved2 osd2.linux2.l_i_reserved2
711
712#elif defined(__GNU__)
713
714#define i_translator osd1.hurd1.h_i_translator
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700715#define i_uid_high osd2.hurd2.h_i_uid_high
716#define i_gid_high osd2.hurd2.h_i_gid_high
717#define i_author osd2.hurd2.h_i_author
718
719#elif defined(__masix__)
720
721#define i_reserved1 osd1.masix1.m_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700722#define i_file_acl_high osd2.masix2.m_i_file_acl_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700723#define i_reserved2 osd2.masix2.m_i_reserved2
724
725#endif /* defined(__KERNEL__) || defined(__linux__) */
726
727/*
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400728 * storage for cached extent
729 */
730struct ext4_ext_cache {
731 ext4_fsblk_t ec_start;
732 ext4_lblk_t ec_block;
733 __u32 ec_len; /* must be 32bit to return holes */
734 __u32 ec_type;
735};
736
737/*
738 * fourth extended file system inode data in memory
739 */
740struct ext4_inode_info {
741 __le32 i_data[15]; /* unconverted */
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400742 __u32 i_dtime;
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400743 ext4_fsblk_t i_file_acl;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400744
745 /*
746 * i_block_group is the number of the block group which contains
747 * this file's inode. Constant across the lifetime of the inode,
748 * it is ued for making block allocation decisions - we try to
749 * place a file's data blocks near its inode block, and new inodes
750 * near to their parent directory's inode.
751 */
752 ext4_group_t i_block_group;
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500753 unsigned long i_state_flags; /* Dynamic state flags */
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400754 unsigned long i_flags;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400755
756 ext4_lblk_t i_dir_start_lookup;
757#ifdef CONFIG_EXT4_FS_XATTR
758 /*
759 * Extended attributes can be read independently of the main file
760 * data. Taking i_mutex even when reading would cause contention
761 * between readers of EAs and writers of regular file data, so
762 * instead we synchronize on xattr_sem when reading or changing
763 * EAs.
764 */
765 struct rw_semaphore xattr_sem;
766#endif
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400767
768 struct list_head i_orphan; /* unlinked but open inodes */
769
770 /*
771 * i_disksize keeps track of what the inode size is ON DISK, not
772 * in memory. During truncate, i_size is set to the new size by
773 * the VFS prior to calling ext4_truncate(), but the filesystem won't
774 * set i_disksize to 0 until the truncate is actually under way.
775 *
776 * The intent is that i_disksize always represents the blocks which
777 * are used by this file. This allows recovery to restart truncate
778 * on orphans if we crash during truncate. We actually write i_disksize
779 * into the on-disk inode when writing inodes out, instead of i_size.
780 *
781 * The only time when i_disksize and i_size may be different is when
782 * a truncate is in progress. The only things which change i_disksize
783 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
784 */
785 loff_t i_disksize;
786
787 /*
788 * i_data_sem is for serialising ext4_truncate() against
789 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
790 * data tree are chopped off during truncate. We can't do that in
791 * ext4 because whenever we perform intermediate commits during
792 * truncate, the inode and all the metadata blocks *must* be in a
793 * consistent state which allows truncation of the orphans to restart
794 * during recovery. Hence we must fix the get_block-vs-truncate race
795 * by other means, so we have i_data_sem.
796 */
797 struct rw_semaphore i_data_sem;
798 struct inode vfs_inode;
799 struct jbd2_inode jinode;
800
801 struct ext4_ext_cache i_cached_extent;
802 /*
803 * File creation time. Its function is same as that of
804 * struct timespec i_{a,c,m}time in the generic inode.
805 */
806 struct timespec i_crtime;
807
808 /* mballoc */
809 struct list_head i_prealloc_list;
810 spinlock_t i_prealloc_lock;
811
812 /* ialloc */
813 ext4_group_t i_last_alloc_group;
814
815 /* allocation reservation info for delalloc */
816 unsigned int i_reserved_data_blocks;
817 unsigned int i_reserved_meta_blocks;
818 unsigned int i_allocated_meta_blocks;
819 unsigned short i_delalloc_reserved_flag;
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500820 sector_t i_da_metadata_calc_last_lblock;
821 int i_da_metadata_calc_len;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400822
823 /* on-disk additional length */
824 __u16 i_extra_isize;
825
826 spinlock_t i_block_reservation_lock;
Dmitry Monakhova9e7f442009-12-14 15:21:14 +0300827#ifdef CONFIG_QUOTA
828 /* quota space reservation, managed internally by quota code */
829 qsize_t i_reserved_quota;
830#endif
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400831
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500832 /* completed IOs that might need unwritten extents handling */
833 struct list_head i_completed_io_list;
Jiaying Zhang744692d2010-03-04 16:14:02 -0500834 spinlock_t i_completed_io_lock;
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400835 /* current io_end structure for async DIO write*/
836 ext4_io_end_t *cur_aio_dio;
Jan Karab436b9b2009-12-08 23:51:10 -0500837
838 /*
839 * Transactions that contain inode's metadata needed to complete
840 * fsync and fdatasync, respectively.
841 */
842 tid_t i_sync_tid;
843 tid_t i_datasync_tid;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400844};
845
846/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700847 * File system states
848 */
Mingming Cao617ba132006-10-11 01:20:53 -0700849#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
850#define EXT4_ERROR_FS 0x0002 /* Errors detected */
851#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700852
853/*
Theodore Tso469108f2008-02-10 01:11:44 -0500854 * Misc. filesystem flags
855 */
856#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
857#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
858#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
859
860/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700861 * Mount flags
862 */
Mingming Cao617ba132006-10-11 01:20:53 -0700863#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
864#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
865#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
866#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
867#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
868#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
869#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
870#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
Mingming Cao617ba132006-10-11 01:20:53 -0700871#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
872#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
873#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
874#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
875#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
876#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
877#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
878#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
Theodore Ts'oafd46722009-03-16 23:12:23 -0400879#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
Mingming Cao617ba132006-10-11 01:20:53 -0700880#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
Mingming Cao617ba132006-10-11 01:20:53 -0700881#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
882#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
883#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
Jiaying Zhang744692d2010-03-04 16:14:02 -0500884#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
Linus Torvaldsd4da6c92009-11-02 10:15:27 -0800885#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
Girish Shilamkar818d2762008-01-28 23:58:27 -0500886#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500887#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
Alex Tomas64769242008-07-11 19:27:31 -0400888#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400889#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400890#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
Eric Sandeen5328e632009-11-19 14:25:42 -0500891#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400892
Mingming Cao617ba132006-10-11 01:20:53 -0700893#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
894#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
895#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
896 EXT4_MOUNT_##opt)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700897
Mingming Cao617ba132006-10-11 01:20:53 -0700898#define ext4_set_bit ext2_set_bit
899#define ext4_set_bit_atomic ext2_set_bit_atomic
900#define ext4_clear_bit ext2_clear_bit
901#define ext4_clear_bit_atomic ext2_clear_bit_atomic
902#define ext4_test_bit ext2_test_bit
903#define ext4_find_first_zero_bit ext2_find_first_zero_bit
904#define ext4_find_next_zero_bit ext2_find_next_zero_bit
Aneesh Kumar K.Vaa02ad62008-01-28 23:58:27 -0500905#define ext4_find_next_bit ext2_find_next_bit
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700906
907/*
908 * Maximal mount counts between two filesystem checks
909 */
Mingming Cao617ba132006-10-11 01:20:53 -0700910#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
911#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700912
913/*
914 * Behaviour when detecting errors
915 */
Mingming Cao617ba132006-10-11 01:20:53 -0700916#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
917#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
918#define EXT4_ERRORS_PANIC 3 /* Panic */
919#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700920
921/*
922 * Structure of the super block
923 */
Mingming Cao617ba132006-10-11 01:20:53 -0700924struct ext4_super_block {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700925/*00*/ __le32 s_inodes_count; /* Inodes count */
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -0400926 __le32 s_blocks_count_lo; /* Blocks count */
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -0400927 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
928 __le32 s_free_blocks_count_lo; /* Free blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700929/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
930 __le32 s_first_data_block; /* First Data Block */
931 __le32 s_log_block_size; /* Block size */
Coly Lif077d0d2007-10-16 18:38:25 -0400932 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700933/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
Coly Lif077d0d2007-10-16 18:38:25 -0400934 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700935 __le32 s_inodes_per_group; /* # Inodes per group */
936 __le32 s_mtime; /* Mount time */
937/*30*/ __le32 s_wtime; /* Write time */
938 __le16 s_mnt_count; /* Mount count */
939 __le16 s_max_mnt_count; /* Maximal mount count */
940 __le16 s_magic; /* Magic signature */
941 __le16 s_state; /* File system state */
942 __le16 s_errors; /* Behaviour when detecting errors */
943 __le16 s_minor_rev_level; /* minor revision level */
944/*40*/ __le32 s_lastcheck; /* time of last check */
945 __le32 s_checkinterval; /* max. time between checks */
946 __le32 s_creator_os; /* OS */
947 __le32 s_rev_level; /* Revision level */
948/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
949 __le16 s_def_resgid; /* Default gid for reserved blocks */
950 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700951 * These fields are for EXT4_DYNAMIC_REV superblocks only.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700952 *
953 * Note: the difference between the compatible feature set and
954 * the incompatible feature set is that if there is a bit set
955 * in the incompatible feature set that the kernel doesn't
956 * know about, it should refuse to mount the filesystem.
957 *
958 * e2fsck's requirements are more strict; if it doesn't know
959 * about a feature in either the compatible or incompatible
960 * feature set, it must abort and not try to meddle with
961 * things it doesn't understand...
962 */
963 __le32 s_first_ino; /* First non-reserved inode */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700964 __le16 s_inode_size; /* size of inode structure */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700965 __le16 s_block_group_nr; /* block group # of this superblock */
966 __le32 s_feature_compat; /* compatible feature set */
967/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
968 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
969/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
970/*78*/ char s_volume_name[16]; /* volume name */
971/*88*/ char s_last_mounted[64]; /* directory where last mounted */
972/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
973 /*
974 * Performance hints. Directory preallocation should only
Mingming Cao617ba132006-10-11 01:20:53 -0700975 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700976 */
977 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
978 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
979 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
980 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700981 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700982 */
983/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
984/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
985 __le32 s_journal_dev; /* device number of journal file */
986 __le32 s_last_orphan; /* start of list of inodes to delete */
987 __le32 s_hash_seed[4]; /* HTREE hash seed */
988 __u8 s_def_hash_version; /* Default hash version to use */
Theodore Ts'o89eeddf2010-07-27 11:56:04 -0400989 __u8 s_jnl_backup_type;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700990 __le16 s_desc_size; /* size of group descriptor */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700991/*100*/ __le32 s_default_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700992 __le32 s_first_meta_bg; /* First metablock block group */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700993 __le32 s_mkfs_time; /* When the filesystem was created */
994 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
995 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
996/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
997 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
998 __le32 s_free_blocks_count_hi; /* Free blocks count */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -0400999 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1000 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1001 __le32 s_flags; /* Miscellaneous flags */
1002 __le16 s_raid_stride; /* RAID stride */
1003 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
1004 __le64 s_mmp_block; /* Block for multi-mount protection */
1005 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001006 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
Theodore Ts'o89eeddf2010-07-27 11:56:04 -04001007 __u8 s_reserved_char_pad;
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001008 __le16 s_reserved_pad;
Theodore Ts'oafc32f72009-02-28 19:39:58 -05001009 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
Theodore Ts'o4a9cdec2010-06-29 11:00:23 -04001010 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1011 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1012 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1013 snapshot's future use */
1014 __le32 s_snapshot_list; /* inode number of the head of the
1015 on-disk snapshot list */
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04001016#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1017 __le32 s_error_count; /* number of fs errors */
1018 __le32 s_first_error_time; /* first time an error happened */
1019 __le32 s_first_error_ino; /* inode involved in first error */
1020 __le64 s_first_error_block; /* block involved of first error */
1021 __u8 s_first_error_func[32]; /* function where the error happened */
1022 __le32 s_first_error_line; /* line number where error happened */
1023 __le32 s_last_error_time; /* most recent time of an error */
1024 __le32 s_last_error_ino; /* inode involved in last error */
1025 __le32 s_last_error_line; /* line number where error happened */
1026 __le64 s_last_error_block; /* block involved of last error */
1027 __u8 s_last_error_func[32]; /* function where the error happened */
Theodore Ts'o8b67f042010-08-01 23:14:20 -04001028#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1029 __u8 s_mount_opts[64];
1030 __le32 s_reserved[112]; /* Padding to the end of the block */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001031};
1032
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04001033#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1034
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001035#ifdef __KERNEL__
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001036
1037/*
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04001038 * run-time mount flags
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001039 */
1040#define EXT4_MF_MNTDIR_SAMPLED 0x0001
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04001041#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001042
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001043/*
1044 * fourth extended-fs super-block data in memory
1045 */
1046struct ext4_sb_info {
1047 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1048 unsigned long s_inodes_per_block;/* Number of inodes per block */
1049 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1050 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1051 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1052 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1053 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1054 ext4_group_t s_groups_count; /* Number of groups in the fs */
Eric Sandeenfb0a3872009-09-16 14:45:10 -04001055 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001056 unsigned long s_overhead_last; /* Last calculated overhead */
1057 unsigned long s_blocks_last; /* Last seen block count */
1058 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1059 struct buffer_head * s_sbh; /* Buffer containing the super block */
1060 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1061 struct buffer_head **s_group_desc;
Theodore Ts'o7f4520c2009-06-13 10:09:41 -04001062 unsigned int s_mount_opt;
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001063 unsigned int s_mount_flags;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001064 ext4_fsblk_t s_sb_block;
1065 uid_t s_resuid;
1066 gid_t s_resgid;
1067 unsigned short s_mount_state;
1068 unsigned short s_pad;
1069 int s_addr_per_block_bits;
1070 int s_desc_per_block_bits;
1071 int s_inode_size;
1072 int s_first_ino;
1073 unsigned int s_inode_readahead_blks;
Andreas Dilger11013912009-06-13 11:45:35 -04001074 unsigned int s_inode_goal;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001075 spinlock_t s_next_gen_lock;
1076 u32 s_next_generation;
1077 u32 s_hash_seed[4];
1078 int s_def_hash_version;
1079 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1080 struct percpu_counter s_freeblocks_counter;
1081 struct percpu_counter s_freeinodes_counter;
1082 struct percpu_counter s_dirs_counter;
1083 struct percpu_counter s_dirtyblocks_counter;
1084 struct blockgroup_lock *s_blockgroup_lock;
1085 struct proc_dir_entry *s_proc;
1086 struct kobject s_kobj;
1087 struct completion s_kobj_unregister;
1088
1089 /* Journaling */
1090 struct inode *s_journal_inode;
1091 struct journal_s *s_journal;
1092 struct list_head s_orphan;
1093 struct mutex s_orphan_lock;
1094 struct mutex s_resize_lock;
1095 unsigned long s_commit_interval;
1096 u32 s_max_batch_time;
1097 u32 s_min_batch_time;
1098 struct block_device *journal_bdev;
1099#ifdef CONFIG_JBD2_DEBUG
1100 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
1101 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
1102#endif
1103#ifdef CONFIG_QUOTA
1104 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1105 int s_jquota_fmt; /* Format of quota to use */
1106#endif
1107 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04001108 struct rb_root system_blks;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001109
1110#ifdef EXTENTS_STATS
1111 /* ext4 extents stats */
1112 unsigned long s_ext_min;
1113 unsigned long s_ext_max;
1114 unsigned long s_depth_max;
1115 spinlock_t s_ext_stats_lock;
1116 unsigned long s_ext_blocks;
1117 unsigned long s_ext_extents;
1118#endif
1119
1120 /* for buddy allocator */
1121 struct ext4_group_info ***s_group_info;
1122 struct inode *s_buddy_cache;
1123 long s_blocks_reserved;
1124 spinlock_t s_reserve_lock;
1125 spinlock_t s_md_lock;
1126 tid_t s_last_transaction;
1127 unsigned short *s_mb_offsets;
1128 unsigned int *s_mb_maxs;
1129
1130 /* tunables */
1131 unsigned long s_stripe;
1132 unsigned int s_mb_stream_request;
1133 unsigned int s_mb_max_to_scan;
1134 unsigned int s_mb_min_to_scan;
1135 unsigned int s_mb_stats;
1136 unsigned int s_mb_order2_reqs;
1137 unsigned int s_mb_group_prealloc;
Theodore Ts'o55138e02009-09-29 13:31:31 -04001138 unsigned int s_max_writeback_mb_bump;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001139 /* where last allocation was done - for stream allocation */
1140 unsigned long s_mb_last_group;
1141 unsigned long s_mb_last_start;
1142
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001143 /* stats for buddy allocator */
1144 spinlock_t s_mb_pa_lock;
1145 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1146 atomic_t s_bal_success; /* we found long enough chunks */
1147 atomic_t s_bal_allocated; /* in blocks */
1148 atomic_t s_bal_ex_scanned; /* total extents scanned */
1149 atomic_t s_bal_goals; /* goal hits */
1150 atomic_t s_bal_breaks; /* too long searches */
1151 atomic_t s_bal_2orders; /* 2^order hits */
1152 spinlock_t s_bal_lock;
1153 unsigned long s_mb_buddies_generated;
1154 unsigned long long s_mb_generation_time;
1155 atomic_t s_mb_lost_chunks;
1156 atomic_t s_mb_preallocated;
1157 atomic_t s_mb_discarded;
Theodore Ts'o50797482009-09-18 13:34:02 -04001158 atomic_t s_lock_busy;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001159
1160 /* locality groups */
Tejun Heo003cb602010-02-02 14:39:01 +09001161 struct ext4_locality_group __percpu *s_locality_groups;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001162
1163 /* for write statistics */
1164 unsigned long s_sectors_written_start;
1165 u64 s_kbytes_written;
1166
1167 unsigned int s_log_groups_per_flex;
1168 struct flex_groups *s_flex_groups;
Mingming Cao4c0425f2009-09-28 15:48:41 -04001169
1170 /* workqueue for dio unwritten */
1171 struct workqueue_struct *dio_unwritten_wq;
Theodore Ts'o66e61a92010-07-27 11:56:04 -04001172
1173 /* timer for periodic error stats printing */
1174 struct timer_list s_err_report;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001175};
1176
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001177static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001178{
1179 return sb->s_fs_info;
1180}
Mingming Cao617ba132006-10-11 01:20:53 -07001181static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001182{
Mingming Cao617ba132006-10-11 01:20:53 -07001183 return container_of(inode, struct ext4_inode_info, vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001184}
1185
Kalpak Shahef7f3832007-07-18 09:15:20 -04001186static inline struct timespec ext4_current_time(struct inode *inode)
1187{
1188 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1189 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1190}
1191
Mingming Cao617ba132006-10-11 01:20:53 -07001192static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001193{
Mingming Cao617ba132006-10-11 01:20:53 -07001194 return ino == EXT4_ROOT_INO ||
1195 ino == EXT4_JOURNAL_INO ||
1196 ino == EXT4_RESIZE_INO ||
1197 (ino >= EXT4_FIRST_INO(sb) &&
1198 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001199}
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001200
1201/*
1202 * Inode dynamic state flags
1203 */
1204enum {
1205 EXT4_STATE_JDATA, /* journaled data exists */
1206 EXT4_STATE_NEW, /* inode is newly created */
1207 EXT4_STATE_XATTR, /* has in-inode xattrs */
1208 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1209 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1210 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1211 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
Frank Mayhar14ece102010-05-17 08:00:00 -04001212 EXT4_STATE_NEWENTRY, /* File just added to dir */
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001213};
1214
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001215#define EXT4_INODE_BIT_FNS(name, field) \
1216static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1217{ \
1218 return test_bit(bit, &EXT4_I(inode)->i_##field); \
1219} \
1220static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1221{ \
1222 set_bit(bit, &EXT4_I(inode)->i_##field); \
1223} \
1224static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1225{ \
1226 clear_bit(bit, &EXT4_I(inode)->i_##field); \
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001227}
1228
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001229EXT4_INODE_BIT_FNS(flag, flags)
1230EXT4_INODE_BIT_FNS(state, state_flags)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001231#else
Mingming Cao617ba132006-10-11 01:20:53 -07001232/* Assume that user mode programs are passing in an ext4fs superblock, not
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001233 * a kernel struct super_block. This will allow us to call the feature-test
1234 * macros from user land. */
Mingming Cao617ba132006-10-11 01:20:53 -07001235#define EXT4_SB(sb) (sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001236#endif
1237
Mingming Cao617ba132006-10-11 01:20:53 -07001238#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001239
1240/*
1241 * Codes for operating systems
1242 */
Mingming Cao617ba132006-10-11 01:20:53 -07001243#define EXT4_OS_LINUX 0
1244#define EXT4_OS_HURD 1
1245#define EXT4_OS_MASIX 2
1246#define EXT4_OS_FREEBSD 3
1247#define EXT4_OS_LITES 4
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001248
1249/*
1250 * Revision levels
1251 */
Mingming Cao617ba132006-10-11 01:20:53 -07001252#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1253#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001254
Mingming Cao617ba132006-10-11 01:20:53 -07001255#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1256#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001257
Mingming Cao617ba132006-10-11 01:20:53 -07001258#define EXT4_GOOD_OLD_INODE_SIZE 128
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001259
1260/*
1261 * Feature set definitions
1262 */
1263
Mingming Cao617ba132006-10-11 01:20:53 -07001264#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001265 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001266#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001267 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001268#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001269 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001270#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1271 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1272#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1273 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1274#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1275 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1276#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1277 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1278#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1279 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1280#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1281 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001282
Mingming Cao617ba132006-10-11 01:20:53 -07001283#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1284#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1285#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1286#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1287#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1288#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001289
Mingming Cao617ba132006-10-11 01:20:53 -07001290#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1291#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1292#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001293#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
Andreas Dilger717d50e2007-10-16 18:38:25 -04001294#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001295#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
Kalpak Shahef7f3832007-07-18 09:15:20 -04001296#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001297
Mingming Cao617ba132006-10-11 01:20:53 -07001298#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1299#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1300#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1301#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1302#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
Alex Tomasa86c6182006-10-11 01:21:03 -07001303#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001304#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001305#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
Jose R. Santosce421582007-10-16 18:38:25 -04001306#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
Theodore Ts'of710b4b2010-01-25 03:31:32 -05001307#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1308#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001309
Mingming Cao617ba132006-10-11 01:20:53 -07001310#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1311#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1312 EXT4_FEATURE_INCOMPAT_RECOVER| \
Alex Tomasa86c6182006-10-11 01:21:03 -07001313 EXT4_FEATURE_INCOMPAT_META_BG| \
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001314 EXT4_FEATURE_INCOMPAT_EXTENTS| \
Jose R. Santosce421582007-10-16 18:38:25 -04001315 EXT4_FEATURE_INCOMPAT_64BIT| \
1316 EXT4_FEATURE_INCOMPAT_FLEX_BG)
Mingming Cao617ba132006-10-11 01:20:53 -07001317#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1318 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
Andreas Dilger717d50e2007-10-16 18:38:25 -04001319 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001320 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
Kalpak Shahef7f3832007-07-18 09:15:20 -04001321 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001322 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1323 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001324
1325/*
1326 * Default values for user and/or group using reserved blocks
1327 */
Mingming Cao617ba132006-10-11 01:20:53 -07001328#define EXT4_DEF_RESUID 0
1329#define EXT4_DEF_RESGID 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001330
Theodore Ts'o240799c2008-10-09 23:53:47 -04001331#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1332
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001333/*
1334 * Default mount options
1335 */
Mingming Cao617ba132006-10-11 01:20:53 -07001336#define EXT4_DEFM_DEBUG 0x0001
1337#define EXT4_DEFM_BSDGROUPS 0x0002
1338#define EXT4_DEFM_XATTR_USER 0x0004
1339#define EXT4_DEFM_ACL 0x0008
1340#define EXT4_DEFM_UID16 0x0010
1341#define EXT4_DEFM_JMODE 0x0060
1342#define EXT4_DEFM_JMODE_DATA 0x0020
1343#define EXT4_DEFM_JMODE_ORDERED 0x0040
1344#define EXT4_DEFM_JMODE_WBACK 0x0060
Theodore Ts'o8b67f042010-08-01 23:14:20 -04001345#define EXT4_DEFM_NOBARRIER 0x0100
1346#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1347#define EXT4_DEFM_DISCARD 0x0400
1348#define EXT4_DEFM_NODELALLOC 0x0800
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001349
1350/*
Theodore Ts'o30773842009-01-03 20:27:38 -05001351 * Default journal batch times
1352 */
1353#define EXT4_DEF_MIN_BATCH_TIME 0
1354#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1355
1356/*
Theodore Ts'oa4912122009-03-12 12:18:34 -04001357 * Minimum number of groups in a flexgroup before we separate out
1358 * directories into the first block group of a flexgroup
1359 */
1360#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1361
1362/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001363 * Structure of a directory entry
1364 */
Mingming Cao617ba132006-10-11 01:20:53 -07001365#define EXT4_NAME_LEN 255
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001366
Mingming Cao617ba132006-10-11 01:20:53 -07001367struct ext4_dir_entry {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001368 __le32 inode; /* Inode number */
1369 __le16 rec_len; /* Directory entry length */
1370 __le16 name_len; /* Name length */
Mingming Cao617ba132006-10-11 01:20:53 -07001371 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001372};
1373
1374/*
Mingming Cao617ba132006-10-11 01:20:53 -07001375 * The new version of the directory entry. Since EXT4 structures are
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001376 * stored in intel byte order, and the name_len field could never be
1377 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1378 * file_type field.
1379 */
Mingming Cao617ba132006-10-11 01:20:53 -07001380struct ext4_dir_entry_2 {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001381 __le32 inode; /* Inode number */
1382 __le16 rec_len; /* Directory entry length */
1383 __u8 name_len; /* Name length */
1384 __u8 file_type;
Mingming Cao617ba132006-10-11 01:20:53 -07001385 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001386};
1387
1388/*
Mingming Cao617ba132006-10-11 01:20:53 -07001389 * Ext4 directory file types. Only the low 3 bits are used. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001390 * other bits are reserved for now.
1391 */
Mingming Cao617ba132006-10-11 01:20:53 -07001392#define EXT4_FT_UNKNOWN 0
1393#define EXT4_FT_REG_FILE 1
1394#define EXT4_FT_DIR 2
1395#define EXT4_FT_CHRDEV 3
1396#define EXT4_FT_BLKDEV 4
1397#define EXT4_FT_FIFO 5
1398#define EXT4_FT_SOCK 6
1399#define EXT4_FT_SYMLINK 7
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001400
Mingming Cao617ba132006-10-11 01:20:53 -07001401#define EXT4_FT_MAX 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001402
1403/*
Mingming Cao617ba132006-10-11 01:20:53 -07001404 * EXT4_DIR_PAD defines the directory entries boundaries
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001405 *
1406 * NOTE: It must be a multiple of 4
1407 */
Mingming Cao617ba132006-10-11 01:20:53 -07001408#define EXT4_DIR_PAD 4
1409#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1410#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1411 ~EXT4_DIR_ROUND)
Jan Karaa72d7f82008-01-28 23:58:27 -05001412#define EXT4_MAX_REC_LEN ((1<<16)-1)
1413
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001414/*
Eric Sandeen0cfc9252010-08-05 01:46:37 -04001415 * If we ever get support for fs block sizes > page_size, we'll need
1416 * to remove the #if statements in the next two functions...
1417 */
1418static inline unsigned int
1419ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1420{
1421 unsigned len = le16_to_cpu(dlen);
1422
1423#if (PAGE_CACHE_SIZE >= 65536)
1424 if (len == EXT4_MAX_REC_LEN || len == 0)
1425 return blocksize;
1426 return (len & 65532) | ((len & 3) << 16);
1427#else
1428 return len;
1429#endif
1430}
1431
1432static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1433{
1434 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1435 BUG();
1436#if (PAGE_CACHE_SIZE >= 65536)
1437 if (len < 65536)
1438 return cpu_to_le16(len);
1439 if (len == blocksize) {
1440 if (blocksize == 65536)
1441 return cpu_to_le16(EXT4_MAX_REC_LEN);
1442 else
1443 return cpu_to_le16(0);
1444 }
1445 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1446#else
1447 return cpu_to_le16(len);
1448#endif
1449}
1450
1451/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001452 * Hash Tree Directory indexing
1453 * (c) Daniel Phillips, 2001
1454 */
1455
Eric Sandeen4074fe32007-10-16 18:38:25 -04001456#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1457 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001458 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
Mingming Cao617ba132006-10-11 01:20:53 -07001459#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1460#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001461
1462/* Legal values for the dx_root hash_version field: */
1463
1464#define DX_HASH_LEGACY 0
1465#define DX_HASH_HALF_MD4 1
1466#define DX_HASH_TEA 2
Theodore Ts'of99b2582008-10-28 13:21:44 -04001467#define DX_HASH_LEGACY_UNSIGNED 3
1468#define DX_HASH_HALF_MD4_UNSIGNED 4
1469#define DX_HASH_TEA_UNSIGNED 5
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001470
1471#ifdef __KERNEL__
1472
1473/* hash info structure used by the directory hash */
1474struct dx_hash_info
1475{
1476 u32 hash;
1477 u32 minor_hash;
1478 int hash_version;
1479 u32 *seed;
1480};
1481
Mingming Cao617ba132006-10-11 01:20:53 -07001482#define EXT4_HTREE_EOF 0x7fffffff
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001483
1484/*
Mingming Cao617ba132006-10-11 01:20:53 -07001485 * Control parameters used by ext4_htree_next_block
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001486 */
1487#define HASH_NB_ALWAYS 1
1488
1489
1490/*
1491 * Describe an inode's exact location on disk and in memory
1492 */
Mingming Cao617ba132006-10-11 01:20:53 -07001493struct ext4_iloc
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001494{
1495 struct buffer_head *bh;
1496 unsigned long offset;
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001497 ext4_group_t block_group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001498};
1499
Mingming Cao617ba132006-10-11 01:20:53 -07001500static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001501{
Mingming Cao617ba132006-10-11 01:20:53 -07001502 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001503}
1504
1505/*
1506 * This structure is stuffed into the struct file's private_data field
1507 * for directories. It is where we put information so that we can do
1508 * readdir operations in hash tree order.
1509 */
1510struct dir_private_info {
1511 struct rb_root root;
1512 struct rb_node *curr_node;
1513 struct fname *extra_fname;
1514 loff_t last_pos;
1515 __u32 curr_hash;
1516 __u32 curr_minor_hash;
1517 __u32 next_hash;
1518};
1519
1520/* calculate the first block number of the group */
Mingming Cao617ba132006-10-11 01:20:53 -07001521static inline ext4_fsblk_t
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001522ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001523{
Mingming Cao617ba132006-10-11 01:20:53 -07001524 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1525 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001526}
1527
1528/*
1529 * Special error return code only used by dx_probe() and its callers.
1530 */
1531#define ERR_BAD_DX_DIR -75000
1532
Andrew Morton72b64b52006-10-11 01:21:18 -07001533void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05001534 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001535
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04001536extern struct proc_dir_entry *ext4_proc_root;
1537
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001538/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001539 * Function prototypes
1540 */
1541
1542/*
1543 * Ok, these declarations are also in <linux/kernel.h> but none of the
Mingming Cao617ba132006-10-11 01:20:53 -07001544 * ext4 source programs needs to include it so they are duplicated here.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001545 */
Dave Kleikamp8c55e202007-05-24 13:04:54 -04001546# define NORET_TYPE /**/
1547# define ATTRIB_NORET __attribute__((noreturn))
1548# define NORET_AND noreturn,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001549
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001550/* bitmap.c */
1551extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1552
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001553/* balloc.c */
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001554extern unsigned int ext4_block_group(struct super_block *sb,
1555 ext4_fsblk_t blocknr);
1556extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1557 ext4_fsblk_t blocknr);
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001558extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1559extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1560 ext4_group_t group);
Aneesh Kumar K.V7061eba2008-07-11 19:27:31 -04001561extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
Mingming Cao617ba132006-10-11 01:20:53 -07001562 ext4_fsblk_t goal, unsigned long *count, int *errp);
Aneesh Kumar K.V5c791612008-10-08 23:12:24 -04001563extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
Eric Sandeen8c3bf8a2008-10-28 00:08:12 -04001564extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
Aneesh Kumar K.Ve21675d2009-01-05 21:36:02 -05001565extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1566 ext4_fsblk_t block, unsigned long count);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001567extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1568extern void ext4_check_blocks_bitmap(struct super_block *);
Mingming Cao617ba132006-10-11 01:20:53 -07001569extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001570 ext4_group_t block_group,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001571 struct buffer_head ** bh);
Mingming Cao617ba132006-10-11 01:20:53 -07001572extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
Theodore Ts'obb23c202009-05-01 19:44:44 -04001573struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1574 ext4_group_t block_group);
1575extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1576 struct buffer_head *bh,
1577 ext4_group_t group,
1578 struct ext4_group_desc *desc);
1579#define ext4_free_blocks_after_init(sb, group, desc) \
1580 ext4_init_block_bitmap(sb, NULL, group, desc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001581
1582/* dir.c */
Theodore Ts'o60fd4da2010-07-27 11:54:40 -04001583extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1584 struct ext4_dir_entry_2 *,
1585 struct buffer_head *, unsigned int);
1586#define ext4_check_dir_entry(dir, de, bh, offset) \
1587 __ext4_check_dir_entry(__func__, __LINE__, (dir), (de), (bh), (offset))
Mingming Cao617ba132006-10-11 01:20:53 -07001588extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001589 __u32 minor_hash,
Mingming Cao617ba132006-10-11 01:20:53 -07001590 struct ext4_dir_entry_2 *dirent);
1591extern void ext4_htree_free_dir_info(struct dir_private_info *p);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001592
1593/* fsync.c */
Christoph Hellwig7ea80852010-05-26 17:53:25 +02001594extern int ext4_sync_file(struct file *, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001595
1596/* hash.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001597extern int ext4fs_dirhash(const char *name, int len, struct
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001598 dx_hash_info *hinfo);
1599
1600/* ialloc.c */
Theodore Ts'of157a4a2009-06-13 11:09:42 -04001601extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
Andreas Dilger11013912009-06-13 11:45:35 -04001602 const struct qstr *qstr, __u32 goal);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001603extern void ext4_free_inode(handle_t *, struct inode *);
1604extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1605extern unsigned long ext4_count_free_inodes(struct super_block *);
1606extern unsigned long ext4_count_dirs(struct super_block *);
1607extern void ext4_check_inodes_bitmap(struct super_block *);
Theodore Ts'obb23c202009-05-01 19:44:44 -04001608extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
1609 struct buffer_head *bh,
1610 ext4_group_t group,
1611 struct ext4_group_desc *desc);
1612extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001613
Alex Tomasc9de5602008-01-29 00:19:52 -05001614/* mballoc.c */
1615extern long ext4_mb_stats;
1616extern long ext4_mb_max_to_scan;
1617extern int ext4_mb_init(struct super_block *, int);
1618extern int ext4_mb_release(struct super_block *);
1619extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1620 struct ext4_allocation_request *, int *);
1621extern int ext4_mb_reserve_blocks(struct super_block *, int);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04001622extern void ext4_discard_preallocations(struct inode *);
Alex Tomasc9de5602008-01-29 00:19:52 -05001623extern int __init init_ext4_mballoc(void);
1624extern void exit_ext4_mballoc(void);
Theodore Ts'o44338712009-11-22 07:44:56 -05001625extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
Theodore Ts'oe6362602009-11-23 07:17:05 -05001626 struct buffer_head *bh, ext4_fsblk_t block,
1627 unsigned long count, int flags);
Aneesh Kumar K.V920313a2009-01-05 21:36:19 -05001628extern int ext4_mb_add_groupinfo(struct super_block *sb,
Frederic Bohe5f21b0e2008-07-11 19:27:31 -04001629 ext4_group_t i, struct ext4_group_desc *desc);
Aneesh Kumar K.V920313a2009-01-05 21:36:19 -05001630extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1631extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1632 ext4_group_t, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001633/* inode.c */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001634struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1635 ext4_lblk_t, int, int *);
1636struct buffer_head *ext4_bread(handle_t *, struct inode *,
1637 ext4_lblk_t, int, int *);
Eric Sandeen6873fa02008-10-07 00:46:36 -04001638int ext4_get_block(struct inode *inode, sector_t iblock,
1639 struct buffer_head *bh_result, int create);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001640
David Howells1d1fe1e2008-02-07 00:15:37 -08001641extern struct inode *ext4_iget(struct super_block *, unsigned long);
Christoph Hellwiga9185b42010-03-05 09:21:37 +01001642extern int ext4_write_inode(struct inode *, struct writeback_control *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001643extern int ext4_setattr(struct dentry *, struct iattr *);
Mingming Cao3e3398a2008-07-11 19:27:31 -04001644extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1645 struct kstat *stat);
Al Viro0930fcc2010-06-07 13:16:22 -04001646extern void ext4_evict_inode(struct inode *);
1647extern void ext4_clear_inode(struct inode *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001648extern int ext4_sync_inode(handle_t *, struct inode *);
Mingming Cao617ba132006-10-11 01:20:53 -07001649extern void ext4_dirty_inode(struct inode *);
1650extern int ext4_change_inode_journal_flag(struct inode *, int);
1651extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
Duane Griffin91ef4ca2008-07-11 19:27:31 -04001652extern int ext4_can_truncate(struct inode *inode);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001653extern void ext4_truncate(struct inode *);
Jan Kara487caee2009-08-17 22:17:20 -04001654extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
Mingming Cao617ba132006-10-11 01:20:53 -07001655extern void ext4_set_inode_flags(struct inode *);
Jan Karaff9ddf72007-07-18 09:24:20 -04001656extern void ext4_get_inode_flags(struct ext4_inode_info *);
Theodore Ts'occd25062009-02-26 01:04:07 -05001657extern int ext4_alloc_da_blocks(struct inode *inode);
Mingming Cao617ba132006-10-11 01:20:53 -07001658extern void ext4_set_aops(struct inode *inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07001659extern int ext4_writepage_trans_blocks(struct inode *);
Mingming Caoa02908f2008-08-19 22:16:07 -04001660extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
Mingming Caof3bd1f32008-08-19 22:16:03 -04001661extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
Jan Karacf108bc2008-07-11 19:27:31 -04001662extern int ext4_block_truncate_page(handle_t *handle,
Alex Tomasa86c6182006-10-11 01:21:03 -07001663 struct address_space *mapping, loff_t from);
Nick Pigginc2ec1752009-03-31 15:23:21 -07001664extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
Dmitry Monakhova9e7f442009-12-14 15:21:14 +03001665extern qsize_t *ext4_get_reserved_space(struct inode *inode);
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05001666extern int flush_completed_IO(struct inode *inode);
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05001667extern void ext4_da_update_reserve_space(struct inode *inode,
1668 int used, int quota_claim);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001669/* ioctl.c */
Andi Kleen5cdd7b22008-04-29 22:03:54 -04001670extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001671extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001672
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -05001673/* migrate.c */
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -04001674extern int ext4_ext_migrate(struct inode *);
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001675
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001676/* namei.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001677extern int ext4_orphan_add(handle_t *, struct inode *);
1678extern int ext4_orphan_del(handle_t *, struct inode *);
1679extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001680 __u32 start_minor_hash, __u32 *next_hash);
1681
1682/* resize.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001683extern int ext4_group_add(struct super_block *sb,
1684 struct ext4_new_group_data *input);
1685extern int ext4_group_extend(struct super_block *sb,
1686 struct ext4_super_block *es,
1687 ext4_fsblk_t n_blocks_count);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001688
1689/* super.c */
Theodore Ts'oc398eda2010-07-27 11:56:40 -04001690extern void __ext4_error(struct super_block *, const char *, unsigned int,
1691 const char *, ...)
1692 __attribute__ ((format (printf, 4, 5)));
1693#define ext4_error(sb, message...) __ext4_error(sb, __func__, \
1694 __LINE__, ## message)
1695extern void ext4_error_inode(struct inode *, const char *, unsigned int,
1696 ext4_fsblk_t, const char *, ...)
1697 __attribute__ ((format (printf, 5, 6)));
1698extern void ext4_error_file(struct file *, const char *, unsigned int,
1699 const char *, ...)
1700 __attribute__ ((format (printf, 4, 5)));
1701extern void __ext4_std_error(struct super_block *, const char *,
1702 unsigned int, int);
1703extern void __ext4_abort(struct super_block *, const char *, unsigned int,
1704 const char *, ...)
1705 __attribute__ ((format (printf, 4, 5)));
Theodore Ts'oc67d8592010-06-29 11:07:07 -04001706#define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
Theodore Ts'oc398eda2010-07-27 11:56:40 -04001707 __LINE__, ## message)
1708extern void __ext4_warning(struct super_block *, const char *, unsigned int,
Eric Sandeen12062dd2010-02-15 14:19:27 -05001709 const char *, ...)
Theodore Ts'oc398eda2010-07-27 11:56:40 -04001710 __attribute__ ((format (printf, 4, 5)));
1711#define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
1712 __LINE__, ## message)
Eric Sandeenb31e1552009-06-04 17:36:36 -04001713extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1714 __attribute__ ((format (printf, 3, 4)));
Theodore Ts'oe29136f2010-06-29 12:54:28 -04001715extern void __ext4_grp_locked_error(const char *, unsigned int, \
1716 struct super_block *, ext4_group_t, \
1717 unsigned long, ext4_fsblk_t, \
1718 const char *, ...)
1719 __attribute__ ((format (printf, 7, 8)));
1720#define ext4_grp_locked_error(sb, grp, message...) \
1721 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001722extern void ext4_update_dynamic_rev(struct super_block *sb);
Aneesh Kumar K.V99e6f822008-01-28 23:58:27 -05001723extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1724 __u32 compat);
1725extern int ext4_update_rocompat_feature(handle_t *handle,
1726 struct super_block *sb, __u32 rocompat);
1727extern int ext4_update_incompat_feature(handle_t *handle,
1728 struct super_block *sb, __u32 incompat);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001729extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1730 struct ext4_group_desc *bg);
1731extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1732 struct ext4_group_desc *bg);
1733extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1734 struct ext4_group_desc *bg);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05001735extern __u32 ext4_free_blks_count(struct super_block *sb,
1736 struct ext4_group_desc *bg);
1737extern __u32 ext4_free_inodes_count(struct super_block *sb,
1738 struct ext4_group_desc *bg);
1739extern __u32 ext4_used_dirs_count(struct super_block *sb,
1740 struct ext4_group_desc *bg);
1741extern __u32 ext4_itable_unused_count(struct super_block *sb,
1742 struct ext4_group_desc *bg);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001743extern void ext4_block_bitmap_set(struct super_block *sb,
1744 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1745extern void ext4_inode_bitmap_set(struct super_block *sb,
1746 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1747extern void ext4_inode_table_set(struct super_block *sb,
1748 struct ext4_group_desc *bg, ext4_fsblk_t blk);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05001749extern void ext4_free_blks_set(struct super_block *sb,
1750 struct ext4_group_desc *bg, __u32 count);
1751extern void ext4_free_inodes_set(struct super_block *sb,
1752 struct ext4_group_desc *bg, __u32 count);
1753extern void ext4_used_dirs_set(struct super_block *sb,
1754 struct ext4_group_desc *bg, __u32 count);
1755extern void ext4_itable_unused_set(struct super_block *sb,
1756 struct ext4_group_desc *bg, __u32 count);
Theodore Ts'obb23c202009-05-01 19:44:44 -04001757extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1758 struct ext4_group_desc *gdp);
1759extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1760 struct ext4_group_desc *gdp);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001761
1762static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1763{
1764 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001765 le32_to_cpu(es->s_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001766}
1767
1768static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1769{
1770 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001771 le32_to_cpu(es->s_r_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001772}
1773
1774static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1775{
1776 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001777 le32_to_cpu(es->s_free_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001778}
1779
1780static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1781 ext4_fsblk_t blk)
1782{
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001783 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001784 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1785}
1786
1787static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1788 ext4_fsblk_t blk)
1789{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001790 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001791 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1792}
1793
1794static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1795 ext4_fsblk_t blk)
1796{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001797 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001798 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1799}
1800
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001801static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1802{
Theodore Ts'o06a279d2009-01-17 18:41:37 -05001803 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1804 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1805 le32_to_cpu(raw_inode->i_size_lo);
1806 else
1807 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001808}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001809
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001810static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1811{
1812 raw_inode->i_size_lo = cpu_to_le32(i_size);
1813 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1814}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001815
Alex Tomasc9de5602008-01-29 00:19:52 -05001816static inline
1817struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001818 ext4_group_t group)
Alex Tomasc9de5602008-01-29 00:19:52 -05001819{
1820 struct ext4_group_info ***grp_info;
1821 long indexv, indexh;
1822 grp_info = EXT4_SB(sb)->s_group_info;
1823 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1824 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1825 return grp_info[indexv][indexh];
1826}
1827
Theodore Ts'o8df96752009-05-01 08:50:38 -04001828/*
1829 * Reading s_groups_count requires using smp_rmb() afterwards. See
1830 * the locking protocol documented in the comments of ext4_group_add()
1831 * in resize.c
1832 */
1833static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1834{
1835 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
1836
1837 smp_rmb();
1838 return ngroups;
1839}
Alex Tomasc9de5602008-01-29 00:19:52 -05001840
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001841static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1842 ext4_group_t block_group)
1843{
1844 return block_group >> sbi->s_log_groups_per_flex;
1845}
1846
1847static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1848{
1849 return 1 << sbi->s_log_groups_per_flex;
1850}
1851
Mingming Cao617ba132006-10-11 01:20:53 -07001852#define ext4_std_error(sb, errno) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001853do { \
1854 if ((errno)) \
Theodore Ts'oc398eda2010-07-27 11:56:40 -04001855 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001856} while (0)
1857
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04001858#ifdef CONFIG_SMP
Eric Dumazet179f7eb2009-01-06 14:41:04 -08001859/* Each CPU can accumulate percpu_counter_batch blocks in their local
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04001860 * counters. So we need to make sure we have free blocks more
Eric Dumazet179f7eb2009-01-06 14:41:04 -08001861 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04001862 */
Eric Dumazet179f7eb2009-01-06 14:41:04 -08001863#define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04001864#else
1865#define EXT4_FREEBLOCKS_WATERMARK 0
1866#endif
1867
Aneesh Kumar K.Vcf17fea2008-09-13 13:06:18 -04001868static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1869{
1870 /*
1871 * XXX: replace with spinlock if seen contended -bzzz
1872 */
1873 down_write(&EXT4_I(inode)->i_data_sem);
1874 if (newsize > EXT4_I(inode)->i_disksize)
1875 EXT4_I(inode)->i_disksize = newsize;
1876 up_write(&EXT4_I(inode)->i_data_sem);
1877 return ;
1878}
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04001879
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001880struct ext4_group_info {
1881 unsigned long bb_state;
1882 struct rb_root bb_free_root;
Eric Sandeena36b4492009-08-25 22:36:45 -04001883 ext4_grpblk_t bb_first_free; /* first free block */
1884 ext4_grpblk_t bb_free; /* total free blocks */
1885 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
Curt Wohlgemuth8a57d9d2010-05-16 15:00:00 -04001886 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001887 struct list_head bb_prealloc_list;
1888#ifdef DOUBLE_CHECK
1889 void *bb_bitmap;
1890#endif
1891 struct rw_semaphore alloc_sem;
Eric Sandeena36b4492009-08-25 22:36:45 -04001892 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
1893 * regions, index is order.
1894 * bb_counters[3] = 5 means
1895 * 5 free 8-block regions. */
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001896};
1897
1898#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001899
1900#define EXT4_MB_GRP_NEED_INIT(grp) \
1901 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1902
Theodore Ts'o50797482009-09-18 13:34:02 -04001903#define EXT4_MAX_CONTENTION 8
1904#define EXT4_CONTENTION_THRESHOLD 2
1905
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04001906static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1907 ext4_group_t group)
1908{
1909 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1910}
1911
Theodore Ts'o50797482009-09-18 13:34:02 -04001912/*
1913 * Returns true if the filesystem is busy enough that attempts to
1914 * access the block group locks has run into contention.
1915 */
1916static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
1917{
1918 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
1919}
1920
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001921static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1922{
Theodore Ts'o50797482009-09-18 13:34:02 -04001923 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
1924 if (spin_trylock(lock))
1925 /*
1926 * We're able to grab the lock right away, so drop the
1927 * lock contention counter.
1928 */
1929 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
1930 else {
1931 /*
1932 * The lock is busy, so bump the contention counter,
1933 * and then wait on the spin lock.
1934 */
1935 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
1936 EXT4_MAX_CONTENTION);
1937 spin_lock(lock);
1938 }
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001939}
1940
1941static inline void ext4_unlock_group(struct super_block *sb,
1942 ext4_group_t group)
1943{
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04001944 spin_unlock(ext4_group_lock_ptr(sb, group));
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001945}
1946
Theodore Ts'oa0375152010-06-11 23:14:04 -04001947static inline void ext4_mark_super_dirty(struct super_block *sb)
1948{
1949 if (EXT4_SB(sb)->s_journal == NULL)
1950 sb->s_dirt =1;
1951}
1952
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001953/*
1954 * Inodes and files operations
1955 */
1956
1957/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001958extern const struct file_operations ext4_dir_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001959
1960/* file.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001961extern const struct inode_operations ext4_file_inode_operations;
Mingming Cao617ba132006-10-11 01:20:53 -07001962extern const struct file_operations ext4_file_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001963
1964/* namei.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001965extern const struct inode_operations ext4_dir_inode_operations;
1966extern const struct inode_operations ext4_special_inode_operations;
Theodore Ts'o596397b2009-05-01 13:49:15 -04001967extern struct dentry *ext4_get_parent(struct dentry *child);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001968
1969/* symlink.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001970extern const struct inode_operations ext4_symlink_inode_operations;
1971extern const struct inode_operations ext4_fast_symlink_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001972
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04001973/* block_validity */
1974extern void ext4_release_system_zone(struct super_block *sb);
1975extern int ext4_setup_system_zone(struct super_block *sb);
1976extern int __init init_ext4_system_zone(void);
1977extern void exit_ext4_system_zone(void);
1978extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
1979 ext4_fsblk_t start_blk,
1980 unsigned int count);
1981
Alex Tomasa86c6182006-10-11 01:21:03 -07001982/* extents.c */
1983extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1984extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
Mingming Caoa02908f2008-08-19 22:16:07 -04001985extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1986 int chunk);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04001987extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
1988 struct ext4_map_blocks *map, int flags);
Jan Karacf108bc2008-07-11 19:27:31 -04001989extern void ext4_ext_truncate(struct inode *);
Alex Tomasa86c6182006-10-11 01:21:03 -07001990extern void ext4_ext_init(struct super_block *);
1991extern void ext4_ext_release(struct super_block *);
Amit Aroraa2df2a62007-07-17 21:42:41 -04001992extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1993 loff_t len);
Mingming Cao00314622009-09-28 15:49:08 -04001994extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
Eric Sandeena1de02d2010-02-04 23:58:38 -05001995 ssize_t len);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04001996extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
1997 struct ext4_map_blocks *map, int flags);
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001998extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1999 __u64 start, __u64 len);
Akira Fujita748de672009-06-17 19:24:03 -04002000/* move_extent.c */
2001extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2002 __u64 start_orig, __u64 start_donor,
2003 __u64 len, __u64 *moved_len);
2004
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05002005
Jiaying Zhang744692d2010-03-04 16:14:02 -05002006/* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2007enum ext4_state_bits {
2008 BH_Uninit /* blocks are allocated but uninitialized on disk */
2009 = BH_JBDPrivateStart,
2010};
2011
2012BUFFER_FNS(Uninit, uninit)
2013TAS_BUFFER_FNS(Uninit, uninit)
2014
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -05002015/*
2016 * Add new method to test wether block and inode bitmaps are properly
2017 * initialized. With uninit_bg reading the block from disk is not enough
2018 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2019 */
2020#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2021
2022static inline int bitmap_uptodate(struct buffer_head *bh)
2023{
2024 return (buffer_uptodate(bh) &&
2025 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2026}
2027static inline void set_bitmap_uptodate(struct buffer_head *bh)
2028{
2029 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2030}
2031
Akinobu Mita731eb1a2010-03-03 23:55:01 -05002032#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2033
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002034#endif /* __KERNEL__ */
2035
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04002036#endif /* _EXT4_H */