blob: 19a4de57128ad7e493ec7843050d1fccc7bda8a4 [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'o24676da2010-05-16 21:00:00 -040060 ext4_error_inode(__func__, (inode), (fmt), ## a)
Frank Mayhar273df552010-03-02 11:46:09 -050061
62#define EXT4_ERROR_FILE(file, fmt, a...) \
Theodore Ts'o24676da2010-05-16 21:00:00 -040063 ext4_error_file(__func__, (file), (fmt), ## a)
Frank Mayhar273df552010-03-02 11:46:09 -050064
Theodore Ts'od444c3c2009-05-01 13:44:33 -040065/* data type for block offset of block group */
66typedef int ext4_grpblk_t;
67
68/* data type for filesystem-wide blocks number */
69typedef unsigned long long ext4_fsblk_t;
70
71/* data type for file logical block number */
72typedef __u32 ext4_lblk_t;
73
74/* data type for block group number */
75typedef unsigned int ext4_group_t;
76
Theodore Ts'o296c3552009-09-30 00:32:42 -040077/*
Theodore Ts'o60e66792010-05-17 07:00:00 -040078 * Flags used in mballoc's allocation_context flags field.
Theodore Ts'o296c3552009-09-30 00:32:42 -040079 *
80 * Also used to show what's going on for debugging purposes when the
81 * flag field is exported via the traceport interface
82 */
Theodore Ts'od444c3c2009-05-01 13:44:33 -040083
Alex Tomasc9de5602008-01-29 00:19:52 -050084/* prefer goal again. length */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040085#define EXT4_MB_HINT_MERGE 0x0001
Alex Tomasc9de5602008-01-29 00:19:52 -050086/* blocks already reserved */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040087#define EXT4_MB_HINT_RESERVED 0x0002
Alex Tomasc9de5602008-01-29 00:19:52 -050088/* metadata is being allocated */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040089#define EXT4_MB_HINT_METADATA 0x0004
Alex Tomasc9de5602008-01-29 00:19:52 -050090/* first blocks in the file */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040091#define EXT4_MB_HINT_FIRST 0x0008
Alex Tomasc9de5602008-01-29 00:19:52 -050092/* search for the best chunk */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040093#define EXT4_MB_HINT_BEST 0x0010
Alex Tomasc9de5602008-01-29 00:19:52 -050094/* data is being allocated */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040095#define EXT4_MB_HINT_DATA 0x0020
Alex Tomasc9de5602008-01-29 00:19:52 -050096/* don't preallocate (for tails) */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040097#define EXT4_MB_HINT_NOPREALLOC 0x0040
Alex Tomasc9de5602008-01-29 00:19:52 -050098/* allocate for locality group */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040099#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
Alex Tomasc9de5602008-01-29 00:19:52 -0500100/* allocate goal blocks or none */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400101#define EXT4_MB_HINT_GOAL_ONLY 0x0100
Alex Tomasc9de5602008-01-29 00:19:52 -0500102/* goal is meaningful */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400103#define EXT4_MB_HINT_TRY_GOAL 0x0200
Mingming Caod2a17632008-07-14 17:52:37 -0400104/* blocks already pre-reserved by delayed allocation */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -0400105#define EXT4_MB_DELALLOC_RESERVED 0x0400
Theodore Ts'o4ba74d02009-08-09 22:01:13 -0400106/* We are doing stream allocation */
107#define EXT4_MB_STREAM_ALLOC 0x0800
Mingming Caod2a17632008-07-14 17:52:37 -0400108
Alex Tomasc9de5602008-01-29 00:19:52 -0500109
110struct ext4_allocation_request {
111 /* target inode for block we're allocating */
112 struct inode *inode;
Alex Tomasc9de5602008-01-29 00:19:52 -0500113 /* how many blocks we want to allocate */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500114 unsigned int len;
Eric Sandeen726447d2009-07-13 10:24:17 -0400115 /* logical block in target inode */
116 ext4_lblk_t logical;
117 /* the closest logical allocated block to the left */
118 ext4_lblk_t lleft;
119 /* the closest logical allocated block to the right */
120 ext4_lblk_t lright;
121 /* phys. target (a hint) */
122 ext4_fsblk_t goal;
123 /* phys. block for the closest logical allocated block to the left */
124 ext4_fsblk_t pleft;
125 /* phys. block for the closest logical allocated block to the right */
126 ext4_fsblk_t pright;
Alex Tomasc9de5602008-01-29 00:19:52 -0500127 /* flags. see above EXT4_MB_HINT_* */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500128 unsigned int flags;
Alex Tomasc9de5602008-01-29 00:19:52 -0500129};
130
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700131/*
Theodore Ts'oe35fd662010-05-16 19:00:00 -0400132 * Logical to physical block mapping, used by ext4_map_blocks()
133 *
134 * This structure is used to pass requests into ext4_map_blocks() as
135 * well as to store the information returned by ext4_map_blocks(). It
136 * takes less room on the stack than a struct buffer_head.
137 */
138#define EXT4_MAP_NEW (1 << BH_New)
139#define EXT4_MAP_MAPPED (1 << BH_Mapped)
140#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
141#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
142#define EXT4_MAP_UNINIT (1 << BH_Uninit)
143#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
144 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
145 EXT4_MAP_UNINIT)
146
147struct ext4_map_blocks {
148 ext4_fsblk_t m_pblk;
149 ext4_lblk_t m_lblk;
150 unsigned int m_len;
151 unsigned int m_flags;
152};
153
154/*
Theodore Ts'ob3a3ca82009-08-31 23:13:11 -0400155 * For delayed allocation tracking
156 */
157struct mpage_da_data {
158 struct inode *inode;
159 sector_t b_blocknr; /* start block number of extent */
160 size_t b_size; /* size of extent */
161 unsigned long b_state; /* state of the extent */
162 unsigned long first_page, next_page; /* extent of pages */
163 struct writeback_control *wbc;
164 int io_done;
165 int pages_written;
166 int retval;
167};
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500168#define EXT4_IO_UNWRITTEN 0x1
Mingming Cao00314622009-09-28 15:49:08 -0400169typedef struct ext4_io_end {
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400170 struct list_head list; /* per-file finished AIO list */
Mingming Cao00314622009-09-28 15:49:08 -0400171 struct inode *inode; /* file being written to */
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400172 unsigned int flag; /* unwritten or not */
Jiaying Zhang744692d2010-03-04 16:14:02 -0500173 struct page *page; /* page struct for buffer write */
Eric Sandeena1de02d2010-02-04 23:58:38 -0500174 loff_t offset; /* offset in the file */
175 ssize_t size; /* size of the extent */
Mingming Cao00314622009-09-28 15:49:08 -0400176 struct work_struct work; /* data work queue */
177} ext4_io_end_t;
178
Theodore Ts'ob3a3ca82009-08-31 23:13:11 -0400179/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700180 * Special inodes numbers
181 */
Mingming Cao617ba132006-10-11 01:20:53 -0700182#define EXT4_BAD_INO 1 /* Bad blocks inode */
183#define EXT4_ROOT_INO 2 /* Root inode */
184#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
185#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
186#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
187#define EXT4_JOURNAL_INO 8 /* Journal inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700188
Mingming Cao617ba132006-10-11 01:20:53 -0700189/* First non-reserved inode for old ext4 filesystems */
190#define EXT4_GOOD_OLD_FIRST_INO 11
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700191
192/*
193 * Maximal count of links to a file
194 */
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400195#define EXT4_LINK_MAX 65000
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700196
197/*
198 * Macro-instructions used to manage several block sizes
199 */
Mingming Cao617ba132006-10-11 01:20:53 -0700200#define EXT4_MIN_BLOCK_SIZE 1024
Takashi Satoafc7cbc2008-01-28 23:58:27 -0500201#define EXT4_MAX_BLOCK_SIZE 65536
202#define EXT4_MIN_BLOCK_LOG_SIZE 10
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700203#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700204# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700205#else
Mingming Cao617ba132006-10-11 01:20:53 -0700206# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700207#endif
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400208#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700209#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700210# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700211#else
Mingming Cao617ba132006-10-11 01:20:53 -0700212# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700213#endif
214#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700215#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
216#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
217#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700218#else
Mingming Cao617ba132006-10-11 01:20:53 -0700219#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
220 EXT4_GOOD_OLD_INODE_SIZE : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700221 (s)->s_inode_size)
Mingming Cao617ba132006-10-11 01:20:53 -0700222#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
223 EXT4_GOOD_OLD_FIRST_INO : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700224 (s)->s_first_ino)
225#endif
Amit Aroraa2df2a62007-07-17 21:42:41 -0400226#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700227
228/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700229 * Structure of a blocks group descriptor
230 */
Mingming Cao617ba132006-10-11 01:20:53 -0700231struct ext4_group_desc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700232{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400233 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400234 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
235 __le32 bg_inode_table_lo; /* Inodes table block */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500236 __le16 bg_free_blocks_count_lo;/* Free blocks count */
237 __le16 bg_free_inodes_count_lo;/* Free inodes count */
238 __le16 bg_used_dirs_count_lo; /* Directories count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400239 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
240 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500241 __le16 bg_itable_unused_lo; /* Unused inodes count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400242 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700243 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
244 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
245 __le32 bg_inode_table_hi; /* Inodes table block MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500246 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
247 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
248 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500249 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500250 __u32 bg_reserved2[3];
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700251};
252
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400253/*
254 * Structure of a flex block group info
255 */
256
257struct flex_groups {
Theodore Ts'o9f24e422009-03-04 19:09:10 -0500258 atomic_t free_inodes;
259 atomic_t free_blocks;
Theodore Ts'o7d39db12009-03-04 19:31:53 -0500260 atomic_t used_dirs;
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400261};
262
Andreas Dilger717d50e2007-10-16 18:38:25 -0400263#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
264#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
265#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
266
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700267/*
268 * Macro-instructions used to manage group descriptors
269 */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700270#define EXT4_MIN_DESC_SIZE 32
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700271#define EXT4_MIN_DESC_SIZE_64BIT 64
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700272#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
273#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700274#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700275# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
276# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
277# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
278# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700279#else
Mingming Cao617ba132006-10-11 01:20:53 -0700280# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700281# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
Mingming Cao617ba132006-10-11 01:20:53 -0700282# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700283#endif
284
285/*
286 * Constants relative to the data blocks
287 */
Mingming Cao617ba132006-10-11 01:20:53 -0700288#define EXT4_NDIR_BLOCKS 12
289#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
290#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
291#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
292#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700293
294/*
295 * Inode flags
296 */
Mingming Cao617ba132006-10-11 01:20:53 -0700297#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
298#define EXT4_UNRM_FL 0x00000002 /* Undelete */
299#define EXT4_COMPR_FL 0x00000004 /* Compress file */
300#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
301#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
302#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
303#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
304#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700305/* Reserved for compression usage... */
Mingming Cao617ba132006-10-11 01:20:53 -0700306#define EXT4_DIRTY_FL 0x00000100
307#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
308#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
309#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700310/* End compression flags --- maybe not all used */
Mingming Cao617ba132006-10-11 01:20:53 -0700311#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
312#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
313#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
314#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
315#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
316#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500317#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
Alex Tomasa86c6182006-10-11 01:21:03 -0700318#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
Theodore Ts'of710b4b2010-01-25 03:31:32 -0500319#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
Jiaying Zhangc8d46e42010-02-24 09:52:53 -0500320#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500321#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700322
Jiaying Zhangc8d46e42010-02-24 09:52:53 -0500323#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
324#define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700325
Duane Griffin8fa43a82009-02-15 18:57:26 -0500326/* Flags that should be inherited by new inodes from their parent. */
327#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
328 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
329 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
330 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
331 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
332
Duane Griffin2dc6b0d2009-02-15 18:09:20 -0500333/* Flags that are appropriate for regular files (all but dir-specific ones). */
334#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
335
336/* Flags that are appropriate for non-directories/regular files. */
337#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
338
339/* Mask out flags that are inappropriate for the given type of inode. */
340static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
341{
342 if (S_ISDIR(mode))
343 return flags;
344 else if (S_ISREG(mode))
345 return flags & EXT4_REG_FLMASK;
346 else
347 return flags & EXT4_OTHER_FLMASK;
348}
349
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400350/*
351 * Inode flags used for atomic set/get
352 */
353enum {
354 EXT4_INODE_SECRM = 0, /* Secure deletion */
355 EXT4_INODE_UNRM = 1, /* Undelete */
356 EXT4_INODE_COMPR = 2, /* Compress file */
357 EXT4_INODE_SYNC = 3, /* Synchronous updates */
358 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
359 EXT4_INODE_APPEND = 5, /* writes to file may only append */
360 EXT4_INODE_NODUMP = 6, /* do not dump file */
361 EXT4_INODE_NOATIME = 7, /* do not update atime */
362/* Reserved for compression usage... */
363 EXT4_INODE_DIRTY = 8,
364 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
365 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
366 EXT4_INODE_ECOMPR = 11, /* Compression error */
367/* End compression flags --- maybe not all used */
368 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
369 EXT4_INODE_IMAGIC = 13, /* AFS directory */
370 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
371 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
372 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
373 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
374 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
375 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
376 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
377 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
378 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
379};
380
381#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
382#define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
383 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
384 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
385
386/*
387 * Since it's pretty easy to mix up bit numbers and hex values, and we
388 * can't do a compile-time test for ENUM values, we use a run-time
389 * test to make sure that EXT4_XXX_FL is consistent with respect to
390 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
391 * out so it won't cost any extra space in the compiled kernel image.
392 * But it's important that these values are the same, since we are
393 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
394 * must be consistent with the values of FS_XXX_FL defined in
395 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
396 * ext4 filesystems, and of course the values defined in e2fsprogs.
397 *
398 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
399 */
400static inline void ext4_check_flag_values(void)
401{
402 CHECK_FLAG_VALUE(SECRM);
403 CHECK_FLAG_VALUE(UNRM);
404 CHECK_FLAG_VALUE(COMPR);
405 CHECK_FLAG_VALUE(SYNC);
406 CHECK_FLAG_VALUE(IMMUTABLE);
407 CHECK_FLAG_VALUE(APPEND);
408 CHECK_FLAG_VALUE(NODUMP);
409 CHECK_FLAG_VALUE(NOATIME);
410 CHECK_FLAG_VALUE(DIRTY);
411 CHECK_FLAG_VALUE(COMPRBLK);
412 CHECK_FLAG_VALUE(NOCOMPR);
413 CHECK_FLAG_VALUE(ECOMPR);
414 CHECK_FLAG_VALUE(INDEX);
415 CHECK_FLAG_VALUE(IMAGIC);
416 CHECK_FLAG_VALUE(JOURNAL_DATA);
417 CHECK_FLAG_VALUE(NOTAIL);
418 CHECK_FLAG_VALUE(DIRSYNC);
419 CHECK_FLAG_VALUE(TOPDIR);
420 CHECK_FLAG_VALUE(HUGE_FILE);
421 CHECK_FLAG_VALUE(EXTENTS);
422 CHECK_FLAG_VALUE(EA_INODE);
423 CHECK_FLAG_VALUE(EOFBLOCKS);
424 CHECK_FLAG_VALUE(RESERVED);
425}
426
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700427/* Used to pass group descriptor data when online resize is done */
Mingming Cao617ba132006-10-11 01:20:53 -0700428struct ext4_new_group_input {
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400429 __u32 group; /* Group number for this data */
430 __u64 block_bitmap; /* Absolute block number of block bitmap */
431 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
432 __u64 inode_table; /* Absolute block number of inode table start */
433 __u32 blocks_count; /* Total number of blocks in this group */
434 __u16 reserved_blocks; /* Number of reserved blocks in this group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700435 __u16 unused;
436};
437
Ben Hutchings4d92dc02010-05-17 06:00:00 -0400438#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
439struct compat_ext4_new_group_input {
440 u32 group;
441 compat_u64 block_bitmap;
442 compat_u64 inode_bitmap;
443 compat_u64 inode_table;
444 u32 blocks_count;
445 u16 reserved_blocks;
446 u16 unused;
447};
448#endif
449
Mingming Cao617ba132006-10-11 01:20:53 -0700450/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
451struct ext4_new_group_data {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700452 __u32 group;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700453 __u64 block_bitmap;
454 __u64 inode_bitmap;
455 __u64 inode_table;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700456 __u32 blocks_count;
457 __u16 reserved_blocks;
458 __u16 unused;
459 __u32 free_blocks_count;
460};
461
Amit Aroraa2df2a62007-07-17 21:42:41 -0400462/*
Theodore Ts'oc2177052009-05-14 00:58:52 -0400463 * Flags used by ext4_get_blocks()
Amit Aroraa2df2a62007-07-17 21:42:41 -0400464 */
Theodore Ts'oc2177052009-05-14 00:58:52 -0400465 /* Allocate any needed blocks and/or convert an unitialized
466 extent to be an initialized ext4 */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400467#define EXT4_GET_BLOCKS_CREATE 0x0001
Theodore Ts'oc2177052009-05-14 00:58:52 -0400468 /* Request the creation of an unitialized extent */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400469#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
Theodore Ts'oc2177052009-05-14 00:58:52 -0400470#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
471 EXT4_GET_BLOCKS_CREATE)
Theodore Ts'oc2177052009-05-14 00:58:52 -0400472 /* Caller is from the delayed allocation writeout path,
Theodore Ts'o60e66792010-05-17 07:00:00 -0400473 so set the magic i_delalloc_reserve_flag after taking the
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400474 inode allocation semaphore for */
Jan Kara03f5d8b2009-06-09 00:17:05 -0400475#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
Mingming Cao00314622009-09-28 15:49:08 -0400476 /* caller is from the direct IO path, request to creation of an
477 unitialized extents if not allocated, split the uninitialized
478 extent if blocks has been preallocated already*/
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500479#define EXT4_GET_BLOCKS_PRE_IO 0x0008
Aneesh Kumar K.V1296cc82010-01-15 01:27:59 -0500480#define EXT4_GET_BLOCKS_CONVERT 0x0010
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500481#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
Mingming Cao00314622009-09-28 15:49:08 -0400482 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500483 /* Convert extent to initialized after IO complete */
484#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
Jiaying Zhang744692d2010-03-04 16:14:02 -0500485 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700486
487/*
Theodore Ts'oe6362602009-11-23 07:17:05 -0500488 * Flags used by ext4_free_blocks
489 */
490#define EXT4_FREE_BLOCKS_METADATA 0x0001
491#define EXT4_FREE_BLOCKS_FORGET 0x0002
Theodore Ts'o1f2acb62010-01-22 17:40:42 -0500492#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
Theodore Ts'oe6362602009-11-23 07:17:05 -0500493
494/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700495 * ioctl commands
496 */
Mingming Cao617ba132006-10-11 01:20:53 -0700497#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
498#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
499#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
500#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
Mingming Cao617ba132006-10-11 01:20:53 -0700501#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
502#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
Jose R. Santose23291b2007-07-18 08:57:06 -0400503#ifdef CONFIG_JBD2_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700504#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700505#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700506#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
507#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400508#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
509#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
510#define EXT4_IOC_MIGRATE _IO('f', 9)
Theodore Ts'occd25062009-02-26 01:04:07 -0500511 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400512 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
Theodore Ts'occd25062009-02-26 01:04:07 -0500513#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
Akira Fujita748de672009-06-17 19:24:03 -0400514#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700515
Ben Hutchings899ad0c2010-05-17 05:00:00 -0400516#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700517/*
518 * ioctl commands in 32 bit emulation
519 */
Mingming Cao617ba132006-10-11 01:20:53 -0700520#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
521#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
522#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
523#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
524#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
525#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
526#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
Ben Hutchings4d92dc02010-05-17 06:00:00 -0400527#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
Jose R. Santose23291b2007-07-18 08:57:06 -0400528#ifdef CONFIG_JBD2_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700529#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700530#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700531#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
532#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
Ben Hutchings899ad0c2010-05-17 05:00:00 -0400533#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700534
535
536/*
537 * Mount options
538 */
Mingming Cao617ba132006-10-11 01:20:53 -0700539struct ext4_mount_options {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700540 unsigned long s_mount_opt;
541 uid_t s_resuid;
542 gid_t s_resgid;
543 unsigned long s_commit_interval;
Theodore Ts'o30773842009-01-03 20:27:38 -0500544 u32 s_min_batch_time, s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700545#ifdef CONFIG_QUOTA
546 int s_jquota_fmt;
547 char *s_qf_names[MAXQUOTAS];
548#endif
549};
550
Eric Sandeenfb0a3872009-09-16 14:45:10 -0400551/* Max physical block we can addres w/o extents */
552#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
553
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700554/*
555 * Structure of an inode on the disk
556 */
Mingming Cao617ba132006-10-11 01:20:53 -0700557struct ext4_inode {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700558 __le16 i_mode; /* File mode */
559 __le16 i_uid; /* Low 16 bits of Owner Uid */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500560 __le32 i_size_lo; /* Size in bytes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700561 __le32 i_atime; /* Access time */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400562 __le32 i_ctime; /* Inode Change time */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700563 __le32 i_mtime; /* Modification time */
564 __le32 i_dtime; /* Deletion Time */
565 __le16 i_gid; /* Low 16 bits of Group Id */
566 __le16 i_links_count; /* Links count */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500567 __le32 i_blocks_lo; /* Blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700568 __le32 i_flags; /* File flags */
569 union {
570 struct {
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500571 __le32 l_i_version;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700572 } linux1;
573 struct {
574 __u32 h_i_translator;
575 } hurd1;
576 struct {
577 __u32 m_i_reserved1;
578 } masix1;
579 } osd1; /* OS dependent 1 */
Mingming Cao617ba132006-10-11 01:20:53 -0700580 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700581 __le32 i_generation; /* File version (for NFS) */
Aneesh Kumar K.V7973c0c2008-01-28 23:58:27 -0500582 __le32 i_file_acl_lo; /* File ACL */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500583 __le32 i_size_high;
Coly Lif077d0d2007-10-16 18:38:25 -0400584 __le32 i_obso_faddr; /* Obsoleted fragment address */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700585 union {
586 struct {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500587 __le16 l_i_blocks_high; /* were l_i_reserved1 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700588 __le16 l_i_file_acl_high;
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400589 __le16 l_i_uid_high; /* these 2 fields */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700590 __le16 l_i_gid_high; /* were reserved2[0] */
591 __u32 l_i_reserved2;
592 } linux2;
593 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400594 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700595 __u16 h_i_mode_high;
596 __u16 h_i_uid_high;
597 __u16 h_i_gid_high;
598 __u32 h_i_author;
599 } hurd2;
600 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400601 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700602 __le16 m_i_file_acl_high;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700603 __u32 m_i_reserved2[2];
604 } masix2;
605 } osd2; /* OS dependent 2 */
606 __le16 i_extra_isize;
607 __le16 i_pad1;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400608 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
609 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
610 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
611 __le32 i_crtime; /* File Creation time */
612 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500613 __le32 i_version_hi; /* high 32 bits for 64-bit version */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700614};
615
Akira Fujita748de672009-06-17 19:24:03 -0400616struct move_extent {
617 __u32 reserved; /* should be zero */
618 __u32 donor_fd; /* donor file descriptor */
619 __u64 orig_start; /* logical start offset in block for orig */
620 __u64 donor_start; /* logical start offset in block for donor */
621 __u64 len; /* block length to be moved */
622 __u64 moved_len; /* moved block length */
623};
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700624
Kalpak Shahef7f3832007-07-18 09:15:20 -0400625#define EXT4_EPOCH_BITS 2
626#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
627#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
628
629/*
630 * Extended fields will fit into an inode if the filesystem was formatted
631 * with large inodes (-I 256 or larger) and there are not currently any EAs
632 * consuming all of the available space. For new inodes we always reserve
633 * enough space for the kernel's known extended fields, but for inodes
634 * created with an old kernel this might not have been the case. None of
635 * the extended inode fields is critical for correct filesystem operation.
636 * This macro checks if a certain field fits in the inode. Note that
637 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
638 */
639#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
640 ((offsetof(typeof(*ext4_inode), field) + \
641 sizeof((ext4_inode)->field)) \
642 <= (EXT4_GOOD_OLD_INODE_SIZE + \
643 (einode)->i_extra_isize)) \
644
645static inline __le32 ext4_encode_extra_time(struct timespec *time)
646{
647 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
Theodore Ts'oc1fccc02009-09-30 01:13:55 -0400648 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
649 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
Kalpak Shahef7f3832007-07-18 09:15:20 -0400650}
651
652static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
653{
654 if (sizeof(time->tv_sec) > 4)
655 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
656 << 32;
Theodore Ts'oc1fccc02009-09-30 01:13:55 -0400657 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400658}
659
660#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
661do { \
662 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
663 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
664 (raw_inode)->xtime ## _extra = \
665 ext4_encode_extra_time(&(inode)->xtime); \
666} while (0)
667
668#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
669do { \
670 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
671 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
672 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
673 (raw_inode)->xtime ## _extra = \
674 ext4_encode_extra_time(&(einode)->xtime); \
675} while (0)
676
677#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
678do { \
679 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
680 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
681 ext4_decode_extra_time(&(inode)->xtime, \
682 raw_inode->xtime ## _extra); \
683} while (0)
684
685#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
686do { \
687 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
688 (einode)->xtime.tv_sec = \
689 (signed)le32_to_cpu((raw_inode)->xtime); \
690 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
691 ext4_decode_extra_time(&(einode)->xtime, \
692 raw_inode->xtime ## _extra); \
693} while (0)
694
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500695#define i_disk_version osd1.linux1.l_i_version
696
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700697#if defined(__KERNEL__) || defined(__linux__)
698#define i_reserved1 osd1.linux1.l_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700699#define i_file_acl_high osd2.linux2.l_i_file_acl_high
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500700#define i_blocks_high osd2.linux2.l_i_blocks_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700701#define i_uid_low i_uid
702#define i_gid_low i_gid
703#define i_uid_high osd2.linux2.l_i_uid_high
704#define i_gid_high osd2.linux2.l_i_gid_high
705#define i_reserved2 osd2.linux2.l_i_reserved2
706
707#elif defined(__GNU__)
708
709#define i_translator osd1.hurd1.h_i_translator
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700710#define i_uid_high osd2.hurd2.h_i_uid_high
711#define i_gid_high osd2.hurd2.h_i_gid_high
712#define i_author osd2.hurd2.h_i_author
713
714#elif defined(__masix__)
715
716#define i_reserved1 osd1.masix1.m_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700717#define i_file_acl_high osd2.masix2.m_i_file_acl_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700718#define i_reserved2 osd2.masix2.m_i_reserved2
719
720#endif /* defined(__KERNEL__) || defined(__linux__) */
721
722/*
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400723 * storage for cached extent
724 */
725struct ext4_ext_cache {
726 ext4_fsblk_t ec_start;
727 ext4_lblk_t ec_block;
728 __u32 ec_len; /* must be 32bit to return holes */
729 __u32 ec_type;
730};
731
732/*
733 * fourth extended file system inode data in memory
734 */
735struct ext4_inode_info {
736 __le32 i_data[15]; /* unconverted */
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400737 __u32 i_dtime;
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400738 ext4_fsblk_t i_file_acl;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400739
740 /*
741 * i_block_group is the number of the block group which contains
742 * this file's inode. Constant across the lifetime of the inode,
743 * it is ued for making block allocation decisions - we try to
744 * place a file's data blocks near its inode block, and new inodes
745 * near to their parent directory's inode.
746 */
747 ext4_group_t i_block_group;
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500748 unsigned long i_state_flags; /* Dynamic state flags */
Dmitry Monakhov12e9b892010-05-16 22:00:00 -0400749 unsigned long i_flags;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400750
751 ext4_lblk_t i_dir_start_lookup;
752#ifdef CONFIG_EXT4_FS_XATTR
753 /*
754 * Extended attributes can be read independently of the main file
755 * data. Taking i_mutex even when reading would cause contention
756 * between readers of EAs and writers of regular file data, so
757 * instead we synchronize on xattr_sem when reading or changing
758 * EAs.
759 */
760 struct rw_semaphore xattr_sem;
761#endif
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400762
763 struct list_head i_orphan; /* unlinked but open inodes */
764
765 /*
766 * i_disksize keeps track of what the inode size is ON DISK, not
767 * in memory. During truncate, i_size is set to the new size by
768 * the VFS prior to calling ext4_truncate(), but the filesystem won't
769 * set i_disksize to 0 until the truncate is actually under way.
770 *
771 * The intent is that i_disksize always represents the blocks which
772 * are used by this file. This allows recovery to restart truncate
773 * on orphans if we crash during truncate. We actually write i_disksize
774 * into the on-disk inode when writing inodes out, instead of i_size.
775 *
776 * The only time when i_disksize and i_size may be different is when
777 * a truncate is in progress. The only things which change i_disksize
778 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
779 */
780 loff_t i_disksize;
781
782 /*
783 * i_data_sem is for serialising ext4_truncate() against
784 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
785 * data tree are chopped off during truncate. We can't do that in
786 * ext4 because whenever we perform intermediate commits during
787 * truncate, the inode and all the metadata blocks *must* be in a
788 * consistent state which allows truncation of the orphans to restart
789 * during recovery. Hence we must fix the get_block-vs-truncate race
790 * by other means, so we have i_data_sem.
791 */
792 struct rw_semaphore i_data_sem;
793 struct inode vfs_inode;
794 struct jbd2_inode jinode;
795
796 struct ext4_ext_cache i_cached_extent;
797 /*
798 * File creation time. Its function is same as that of
799 * struct timespec i_{a,c,m}time in the generic inode.
800 */
801 struct timespec i_crtime;
802
803 /* mballoc */
804 struct list_head i_prealloc_list;
805 spinlock_t i_prealloc_lock;
806
807 /* ialloc */
808 ext4_group_t i_last_alloc_group;
809
810 /* allocation reservation info for delalloc */
811 unsigned int i_reserved_data_blocks;
812 unsigned int i_reserved_meta_blocks;
813 unsigned int i_allocated_meta_blocks;
814 unsigned short i_delalloc_reserved_flag;
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500815 sector_t i_da_metadata_calc_last_lblock;
816 int i_da_metadata_calc_len;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400817
818 /* on-disk additional length */
819 __u16 i_extra_isize;
820
821 spinlock_t i_block_reservation_lock;
Dmitry Monakhova9e7f442009-12-14 15:21:14 +0300822#ifdef CONFIG_QUOTA
823 /* quota space reservation, managed internally by quota code */
824 qsize_t i_reserved_quota;
825#endif
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400826
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500827 /* completed IOs that might need unwritten extents handling */
828 struct list_head i_completed_io_list;
Jiaying Zhang744692d2010-03-04 16:14:02 -0500829 spinlock_t i_completed_io_lock;
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400830 /* current io_end structure for async DIO write*/
831 ext4_io_end_t *cur_aio_dio;
Jan Karab436b9b2009-12-08 23:51:10 -0500832
833 /*
834 * Transactions that contain inode's metadata needed to complete
835 * fsync and fdatasync, respectively.
836 */
837 tid_t i_sync_tid;
838 tid_t i_datasync_tid;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400839};
840
841/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700842 * File system states
843 */
Mingming Cao617ba132006-10-11 01:20:53 -0700844#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
845#define EXT4_ERROR_FS 0x0002 /* Errors detected */
846#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700847
848/*
Theodore Tso469108f2008-02-10 01:11:44 -0500849 * Misc. filesystem flags
850 */
851#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
852#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
853#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
854
855/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700856 * Mount flags
857 */
Mingming Cao617ba132006-10-11 01:20:53 -0700858#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
859#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
860#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
861#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
862#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
863#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
864#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
865#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
Mingming Cao617ba132006-10-11 01:20:53 -0700866#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
867#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
868#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
869#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
870#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
871#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
872#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
873#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
Theodore Ts'oafd46722009-03-16 23:12:23 -0400874#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
Mingming Cao617ba132006-10-11 01:20:53 -0700875#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
876#define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
877#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
878#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
879#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
Jiaying Zhang744692d2010-03-04 16:14:02 -0500880#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
Linus Torvaldsd4da6c92009-11-02 10:15:27 -0800881#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
Girish Shilamkar818d2762008-01-28 23:58:27 -0500882#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500883#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
Alex Tomas64769242008-07-11 19:27:31 -0400884#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400885#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400886#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
Eric Sandeen5328e632009-11-19 14:25:42 -0500887#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400888
Mingming Cao617ba132006-10-11 01:20:53 -0700889#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
890#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
891#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
892 EXT4_MOUNT_##opt)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700893
Mingming Cao617ba132006-10-11 01:20:53 -0700894#define ext4_set_bit ext2_set_bit
895#define ext4_set_bit_atomic ext2_set_bit_atomic
896#define ext4_clear_bit ext2_clear_bit
897#define ext4_clear_bit_atomic ext2_clear_bit_atomic
898#define ext4_test_bit ext2_test_bit
899#define ext4_find_first_zero_bit ext2_find_first_zero_bit
900#define ext4_find_next_zero_bit ext2_find_next_zero_bit
Aneesh Kumar K.Vaa02ad62008-01-28 23:58:27 -0500901#define ext4_find_next_bit ext2_find_next_bit
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700902
903/*
904 * Maximal mount counts between two filesystem checks
905 */
Mingming Cao617ba132006-10-11 01:20:53 -0700906#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
907#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700908
909/*
910 * Behaviour when detecting errors
911 */
Mingming Cao617ba132006-10-11 01:20:53 -0700912#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
913#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
914#define EXT4_ERRORS_PANIC 3 /* Panic */
915#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700916
917/*
918 * Structure of the super block
919 */
Mingming Cao617ba132006-10-11 01:20:53 -0700920struct ext4_super_block {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700921/*00*/ __le32 s_inodes_count; /* Inodes count */
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -0400922 __le32 s_blocks_count_lo; /* Blocks count */
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -0400923 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
924 __le32 s_free_blocks_count_lo; /* Free blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700925/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
926 __le32 s_first_data_block; /* First Data Block */
927 __le32 s_log_block_size; /* Block size */
Coly Lif077d0d2007-10-16 18:38:25 -0400928 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700929/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
Coly Lif077d0d2007-10-16 18:38:25 -0400930 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700931 __le32 s_inodes_per_group; /* # Inodes per group */
932 __le32 s_mtime; /* Mount time */
933/*30*/ __le32 s_wtime; /* Write time */
934 __le16 s_mnt_count; /* Mount count */
935 __le16 s_max_mnt_count; /* Maximal mount count */
936 __le16 s_magic; /* Magic signature */
937 __le16 s_state; /* File system state */
938 __le16 s_errors; /* Behaviour when detecting errors */
939 __le16 s_minor_rev_level; /* minor revision level */
940/*40*/ __le32 s_lastcheck; /* time of last check */
941 __le32 s_checkinterval; /* max. time between checks */
942 __le32 s_creator_os; /* OS */
943 __le32 s_rev_level; /* Revision level */
944/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
945 __le16 s_def_resgid; /* Default gid for reserved blocks */
946 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700947 * These fields are for EXT4_DYNAMIC_REV superblocks only.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700948 *
949 * Note: the difference between the compatible feature set and
950 * the incompatible feature set is that if there is a bit set
951 * in the incompatible feature set that the kernel doesn't
952 * know about, it should refuse to mount the filesystem.
953 *
954 * e2fsck's requirements are more strict; if it doesn't know
955 * about a feature in either the compatible or incompatible
956 * feature set, it must abort and not try to meddle with
957 * things it doesn't understand...
958 */
959 __le32 s_first_ino; /* First non-reserved inode */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700960 __le16 s_inode_size; /* size of inode structure */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700961 __le16 s_block_group_nr; /* block group # of this superblock */
962 __le32 s_feature_compat; /* compatible feature set */
963/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
964 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
965/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
966/*78*/ char s_volume_name[16]; /* volume name */
967/*88*/ char s_last_mounted[64]; /* directory where last mounted */
968/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
969 /*
970 * Performance hints. Directory preallocation should only
Mingming Cao617ba132006-10-11 01:20:53 -0700971 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700972 */
973 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
974 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
975 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
976 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700977 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700978 */
979/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
980/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
981 __le32 s_journal_dev; /* device number of journal file */
982 __le32 s_last_orphan; /* start of list of inodes to delete */
983 __le32 s_hash_seed[4]; /* HTREE hash seed */
984 __u8 s_def_hash_version; /* Default hash version to use */
985 __u8 s_reserved_char_pad;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700986 __le16 s_desc_size; /* size of group descriptor */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700987/*100*/ __le32 s_default_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700988 __le32 s_first_meta_bg; /* First metablock block group */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700989 __le32 s_mkfs_time; /* When the filesystem was created */
990 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
991 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
992/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
993 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
994 __le32 s_free_blocks_count_hi; /* Free blocks count */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -0400995 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
996 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
997 __le32 s_flags; /* Miscellaneous flags */
998 __le16 s_raid_stride; /* RAID stride */
999 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
1000 __le64 s_mmp_block; /* Block for multi-mount protection */
1001 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001002 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1003 __u8 s_reserved_char_pad2;
1004 __le16 s_reserved_pad;
Theodore Ts'oafc32f72009-02-28 19:39:58 -05001005 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1006 __u32 s_reserved[160]; /* Padding to the end of the block */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001007};
1008
1009#ifdef __KERNEL__
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001010
1011/*
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04001012 * run-time mount flags
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001013 */
1014#define EXT4_MF_MNTDIR_SAMPLED 0x0001
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04001015#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001016
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001017/*
1018 * fourth extended-fs super-block data in memory
1019 */
1020struct ext4_sb_info {
1021 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1022 unsigned long s_inodes_per_block;/* Number of inodes per block */
1023 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1024 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1025 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1026 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1027 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1028 ext4_group_t s_groups_count; /* Number of groups in the fs */
Eric Sandeenfb0a3872009-09-16 14:45:10 -04001029 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001030 unsigned long s_overhead_last; /* Last calculated overhead */
1031 unsigned long s_blocks_last; /* Last seen block count */
1032 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1033 struct buffer_head * s_sbh; /* Buffer containing the super block */
1034 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1035 struct buffer_head **s_group_desc;
Theodore Ts'o7f4520c2009-06-13 10:09:41 -04001036 unsigned int s_mount_opt;
Theodore Ts'obc0b0d62009-06-13 10:09:48 -04001037 unsigned int s_mount_flags;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001038 ext4_fsblk_t s_sb_block;
1039 uid_t s_resuid;
1040 gid_t s_resgid;
1041 unsigned short s_mount_state;
1042 unsigned short s_pad;
1043 int s_addr_per_block_bits;
1044 int s_desc_per_block_bits;
1045 int s_inode_size;
1046 int s_first_ino;
1047 unsigned int s_inode_readahead_blks;
Andreas Dilger11013912009-06-13 11:45:35 -04001048 unsigned int s_inode_goal;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001049 spinlock_t s_next_gen_lock;
1050 u32 s_next_generation;
1051 u32 s_hash_seed[4];
1052 int s_def_hash_version;
1053 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1054 struct percpu_counter s_freeblocks_counter;
1055 struct percpu_counter s_freeinodes_counter;
1056 struct percpu_counter s_dirs_counter;
1057 struct percpu_counter s_dirtyblocks_counter;
1058 struct blockgroup_lock *s_blockgroup_lock;
1059 struct proc_dir_entry *s_proc;
1060 struct kobject s_kobj;
1061 struct completion s_kobj_unregister;
1062
1063 /* Journaling */
1064 struct inode *s_journal_inode;
1065 struct journal_s *s_journal;
1066 struct list_head s_orphan;
1067 struct mutex s_orphan_lock;
1068 struct mutex s_resize_lock;
1069 unsigned long s_commit_interval;
1070 u32 s_max_batch_time;
1071 u32 s_min_batch_time;
1072 struct block_device *journal_bdev;
1073#ifdef CONFIG_JBD2_DEBUG
1074 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
1075 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
1076#endif
1077#ifdef CONFIG_QUOTA
1078 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1079 int s_jquota_fmt; /* Format of quota to use */
1080#endif
1081 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04001082 struct rb_root system_blks;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001083
1084#ifdef EXTENTS_STATS
1085 /* ext4 extents stats */
1086 unsigned long s_ext_min;
1087 unsigned long s_ext_max;
1088 unsigned long s_depth_max;
1089 spinlock_t s_ext_stats_lock;
1090 unsigned long s_ext_blocks;
1091 unsigned long s_ext_extents;
1092#endif
1093
1094 /* for buddy allocator */
1095 struct ext4_group_info ***s_group_info;
1096 struct inode *s_buddy_cache;
1097 long s_blocks_reserved;
1098 spinlock_t s_reserve_lock;
1099 spinlock_t s_md_lock;
1100 tid_t s_last_transaction;
1101 unsigned short *s_mb_offsets;
1102 unsigned int *s_mb_maxs;
1103
1104 /* tunables */
1105 unsigned long s_stripe;
1106 unsigned int s_mb_stream_request;
1107 unsigned int s_mb_max_to_scan;
1108 unsigned int s_mb_min_to_scan;
1109 unsigned int s_mb_stats;
1110 unsigned int s_mb_order2_reqs;
1111 unsigned int s_mb_group_prealloc;
Theodore Ts'o55138e02009-09-29 13:31:31 -04001112 unsigned int s_max_writeback_mb_bump;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001113 /* where last allocation was done - for stream allocation */
1114 unsigned long s_mb_last_group;
1115 unsigned long s_mb_last_start;
1116
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001117 /* stats for buddy allocator */
1118 spinlock_t s_mb_pa_lock;
1119 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1120 atomic_t s_bal_success; /* we found long enough chunks */
1121 atomic_t s_bal_allocated; /* in blocks */
1122 atomic_t s_bal_ex_scanned; /* total extents scanned */
1123 atomic_t s_bal_goals; /* goal hits */
1124 atomic_t s_bal_breaks; /* too long searches */
1125 atomic_t s_bal_2orders; /* 2^order hits */
1126 spinlock_t s_bal_lock;
1127 unsigned long s_mb_buddies_generated;
1128 unsigned long long s_mb_generation_time;
1129 atomic_t s_mb_lost_chunks;
1130 atomic_t s_mb_preallocated;
1131 atomic_t s_mb_discarded;
Theodore Ts'o50797482009-09-18 13:34:02 -04001132 atomic_t s_lock_busy;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001133
1134 /* locality groups */
Tejun Heo003cb602010-02-02 14:39:01 +09001135 struct ext4_locality_group __percpu *s_locality_groups;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001136
1137 /* for write statistics */
1138 unsigned long s_sectors_written_start;
1139 u64 s_kbytes_written;
1140
1141 unsigned int s_log_groups_per_flex;
1142 struct flex_groups *s_flex_groups;
Mingming Cao4c0425f2009-09-28 15:48:41 -04001143
1144 /* workqueue for dio unwritten */
1145 struct workqueue_struct *dio_unwritten_wq;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001146};
1147
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001148static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001149{
1150 return sb->s_fs_info;
1151}
Mingming Cao617ba132006-10-11 01:20:53 -07001152static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001153{
Mingming Cao617ba132006-10-11 01:20:53 -07001154 return container_of(inode, struct ext4_inode_info, vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001155}
1156
Kalpak Shahef7f3832007-07-18 09:15:20 -04001157static inline struct timespec ext4_current_time(struct inode *inode)
1158{
1159 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1160 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1161}
1162
Mingming Cao617ba132006-10-11 01:20:53 -07001163static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001164{
Mingming Cao617ba132006-10-11 01:20:53 -07001165 return ino == EXT4_ROOT_INO ||
1166 ino == EXT4_JOURNAL_INO ||
1167 ino == EXT4_RESIZE_INO ||
1168 (ino >= EXT4_FIRST_INO(sb) &&
1169 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001170}
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001171
1172/*
1173 * Inode dynamic state flags
1174 */
1175enum {
1176 EXT4_STATE_JDATA, /* journaled data exists */
1177 EXT4_STATE_NEW, /* inode is newly created */
1178 EXT4_STATE_XATTR, /* has in-inode xattrs */
1179 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1180 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1181 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1182 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
Frank Mayhar14ece102010-05-17 08:00:00 -04001183 EXT4_STATE_NEWENTRY, /* File just added to dir */
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001184};
1185
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001186#define EXT4_INODE_BIT_FNS(name, field) \
1187static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1188{ \
1189 return test_bit(bit, &EXT4_I(inode)->i_##field); \
1190} \
1191static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1192{ \
1193 set_bit(bit, &EXT4_I(inode)->i_##field); \
1194} \
1195static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1196{ \
1197 clear_bit(bit, &EXT4_I(inode)->i_##field); \
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001198}
1199
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001200EXT4_INODE_BIT_FNS(flag, flags)
1201EXT4_INODE_BIT_FNS(state, state_flags)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001202#else
Mingming Cao617ba132006-10-11 01:20:53 -07001203/* Assume that user mode programs are passing in an ext4fs superblock, not
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001204 * a kernel struct super_block. This will allow us to call the feature-test
1205 * macros from user land. */
Mingming Cao617ba132006-10-11 01:20:53 -07001206#define EXT4_SB(sb) (sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001207#endif
1208
Mingming Cao617ba132006-10-11 01:20:53 -07001209#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001210
1211/*
1212 * Codes for operating systems
1213 */
Mingming Cao617ba132006-10-11 01:20:53 -07001214#define EXT4_OS_LINUX 0
1215#define EXT4_OS_HURD 1
1216#define EXT4_OS_MASIX 2
1217#define EXT4_OS_FREEBSD 3
1218#define EXT4_OS_LITES 4
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001219
1220/*
1221 * Revision levels
1222 */
Mingming Cao617ba132006-10-11 01:20:53 -07001223#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1224#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001225
Mingming Cao617ba132006-10-11 01:20:53 -07001226#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1227#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001228
Mingming Cao617ba132006-10-11 01:20:53 -07001229#define EXT4_GOOD_OLD_INODE_SIZE 128
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001230
1231/*
1232 * Feature set definitions
1233 */
1234
Mingming Cao617ba132006-10-11 01:20:53 -07001235#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001236 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001237#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001238 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001239#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001240 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001241#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1242 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1243#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1244 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1245#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1246 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1247#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1248 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1249#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1250 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1251#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1252 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001253
Mingming Cao617ba132006-10-11 01:20:53 -07001254#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1255#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1256#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1257#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1258#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1259#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001260
Mingming Cao617ba132006-10-11 01:20:53 -07001261#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1262#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1263#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001264#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
Andreas Dilger717d50e2007-10-16 18:38:25 -04001265#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001266#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
Kalpak Shahef7f3832007-07-18 09:15:20 -04001267#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001268
Mingming Cao617ba132006-10-11 01:20:53 -07001269#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1270#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1271#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1272#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1273#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
Alex Tomasa86c6182006-10-11 01:21:03 -07001274#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001275#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001276#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
Jose R. Santosce421582007-10-16 18:38:25 -04001277#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
Theodore Ts'of710b4b2010-01-25 03:31:32 -05001278#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1279#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001280
Mingming Cao617ba132006-10-11 01:20:53 -07001281#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1282#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1283 EXT4_FEATURE_INCOMPAT_RECOVER| \
Alex Tomasa86c6182006-10-11 01:21:03 -07001284 EXT4_FEATURE_INCOMPAT_META_BG| \
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001285 EXT4_FEATURE_INCOMPAT_EXTENTS| \
Jose R. Santosce421582007-10-16 18:38:25 -04001286 EXT4_FEATURE_INCOMPAT_64BIT| \
1287 EXT4_FEATURE_INCOMPAT_FLEX_BG)
Mingming Cao617ba132006-10-11 01:20:53 -07001288#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1289 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
Andreas Dilger717d50e2007-10-16 18:38:25 -04001290 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001291 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
Kalpak Shahef7f3832007-07-18 09:15:20 -04001292 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001293 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1294 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001295
1296/*
1297 * Default values for user and/or group using reserved blocks
1298 */
Mingming Cao617ba132006-10-11 01:20:53 -07001299#define EXT4_DEF_RESUID 0
1300#define EXT4_DEF_RESGID 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001301
Theodore Ts'o240799c2008-10-09 23:53:47 -04001302#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1303
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001304/*
1305 * Default mount options
1306 */
Mingming Cao617ba132006-10-11 01:20:53 -07001307#define EXT4_DEFM_DEBUG 0x0001
1308#define EXT4_DEFM_BSDGROUPS 0x0002
1309#define EXT4_DEFM_XATTR_USER 0x0004
1310#define EXT4_DEFM_ACL 0x0008
1311#define EXT4_DEFM_UID16 0x0010
1312#define EXT4_DEFM_JMODE 0x0060
1313#define EXT4_DEFM_JMODE_DATA 0x0020
1314#define EXT4_DEFM_JMODE_ORDERED 0x0040
1315#define EXT4_DEFM_JMODE_WBACK 0x0060
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001316
1317/*
Theodore Ts'o30773842009-01-03 20:27:38 -05001318 * Default journal batch times
1319 */
1320#define EXT4_DEF_MIN_BATCH_TIME 0
1321#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1322
1323/*
Theodore Ts'oa4912122009-03-12 12:18:34 -04001324 * Minimum number of groups in a flexgroup before we separate out
1325 * directories into the first block group of a flexgroup
1326 */
1327#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1328
1329/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001330 * Structure of a directory entry
1331 */
Mingming Cao617ba132006-10-11 01:20:53 -07001332#define EXT4_NAME_LEN 255
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001333
Mingming Cao617ba132006-10-11 01:20:53 -07001334struct ext4_dir_entry {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001335 __le32 inode; /* Inode number */
1336 __le16 rec_len; /* Directory entry length */
1337 __le16 name_len; /* Name length */
Mingming Cao617ba132006-10-11 01:20:53 -07001338 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001339};
1340
1341/*
Mingming Cao617ba132006-10-11 01:20:53 -07001342 * The new version of the directory entry. Since EXT4 structures are
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001343 * stored in intel byte order, and the name_len field could never be
1344 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1345 * file_type field.
1346 */
Mingming Cao617ba132006-10-11 01:20:53 -07001347struct ext4_dir_entry_2 {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001348 __le32 inode; /* Inode number */
1349 __le16 rec_len; /* Directory entry length */
1350 __u8 name_len; /* Name length */
1351 __u8 file_type;
Mingming Cao617ba132006-10-11 01:20:53 -07001352 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001353};
1354
1355/*
Mingming Cao617ba132006-10-11 01:20:53 -07001356 * Ext4 directory file types. Only the low 3 bits are used. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001357 * other bits are reserved for now.
1358 */
Mingming Cao617ba132006-10-11 01:20:53 -07001359#define EXT4_FT_UNKNOWN 0
1360#define EXT4_FT_REG_FILE 1
1361#define EXT4_FT_DIR 2
1362#define EXT4_FT_CHRDEV 3
1363#define EXT4_FT_BLKDEV 4
1364#define EXT4_FT_FIFO 5
1365#define EXT4_FT_SOCK 6
1366#define EXT4_FT_SYMLINK 7
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001367
Mingming Cao617ba132006-10-11 01:20:53 -07001368#define EXT4_FT_MAX 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001369
1370/*
Mingming Cao617ba132006-10-11 01:20:53 -07001371 * EXT4_DIR_PAD defines the directory entries boundaries
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001372 *
1373 * NOTE: It must be a multiple of 4
1374 */
Mingming Cao617ba132006-10-11 01:20:53 -07001375#define EXT4_DIR_PAD 4
1376#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1377#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1378 ~EXT4_DIR_ROUND)
Jan Karaa72d7f82008-01-28 23:58:27 -05001379#define EXT4_MAX_REC_LEN ((1<<16)-1)
1380
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001381/*
1382 * Hash Tree Directory indexing
1383 * (c) Daniel Phillips, 2001
1384 */
1385
Eric Sandeen4074fe32007-10-16 18:38:25 -04001386#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1387 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04001388 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
Mingming Cao617ba132006-10-11 01:20:53 -07001389#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1390#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001391
1392/* Legal values for the dx_root hash_version field: */
1393
1394#define DX_HASH_LEGACY 0
1395#define DX_HASH_HALF_MD4 1
1396#define DX_HASH_TEA 2
Theodore Ts'of99b2582008-10-28 13:21:44 -04001397#define DX_HASH_LEGACY_UNSIGNED 3
1398#define DX_HASH_HALF_MD4_UNSIGNED 4
1399#define DX_HASH_TEA_UNSIGNED 5
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001400
1401#ifdef __KERNEL__
1402
1403/* hash info structure used by the directory hash */
1404struct dx_hash_info
1405{
1406 u32 hash;
1407 u32 minor_hash;
1408 int hash_version;
1409 u32 *seed;
1410};
1411
Mingming Cao617ba132006-10-11 01:20:53 -07001412#define EXT4_HTREE_EOF 0x7fffffff
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001413
1414/*
Mingming Cao617ba132006-10-11 01:20:53 -07001415 * Control parameters used by ext4_htree_next_block
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001416 */
1417#define HASH_NB_ALWAYS 1
1418
1419
1420/*
1421 * Describe an inode's exact location on disk and in memory
1422 */
Mingming Cao617ba132006-10-11 01:20:53 -07001423struct ext4_iloc
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001424{
1425 struct buffer_head *bh;
1426 unsigned long offset;
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001427 ext4_group_t block_group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001428};
1429
Mingming Cao617ba132006-10-11 01:20:53 -07001430static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001431{
Mingming Cao617ba132006-10-11 01:20:53 -07001432 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001433}
1434
1435/*
1436 * This structure is stuffed into the struct file's private_data field
1437 * for directories. It is where we put information so that we can do
1438 * readdir operations in hash tree order.
1439 */
1440struct dir_private_info {
1441 struct rb_root root;
1442 struct rb_node *curr_node;
1443 struct fname *extra_fname;
1444 loff_t last_pos;
1445 __u32 curr_hash;
1446 __u32 curr_minor_hash;
1447 __u32 next_hash;
1448};
1449
1450/* calculate the first block number of the group */
Mingming Cao617ba132006-10-11 01:20:53 -07001451static inline ext4_fsblk_t
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001452ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001453{
Mingming Cao617ba132006-10-11 01:20:53 -07001454 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1455 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001456}
1457
1458/*
1459 * Special error return code only used by dx_probe() and its callers.
1460 */
1461#define ERR_BAD_DX_DIR -75000
1462
Andrew Morton72b64b52006-10-11 01:21:18 -07001463void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05001464 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001465
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04001466extern struct proc_dir_entry *ext4_proc_root;
1467
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001468/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001469 * Function prototypes
1470 */
1471
1472/*
1473 * Ok, these declarations are also in <linux/kernel.h> but none of the
Mingming Cao617ba132006-10-11 01:20:53 -07001474 * ext4 source programs needs to include it so they are duplicated here.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001475 */
Dave Kleikamp8c55e202007-05-24 13:04:54 -04001476# define NORET_TYPE /**/
1477# define ATTRIB_NORET __attribute__((noreturn))
1478# define NORET_AND noreturn,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001479
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001480/* bitmap.c */
1481extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1482
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001483/* balloc.c */
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001484extern unsigned int ext4_block_group(struct super_block *sb,
1485 ext4_fsblk_t blocknr);
1486extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1487 ext4_fsblk_t blocknr);
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001488extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1489extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1490 ext4_group_t group);
Aneesh Kumar K.V7061eba2008-07-11 19:27:31 -04001491extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
Mingming Cao617ba132006-10-11 01:20:53 -07001492 ext4_fsblk_t goal, unsigned long *count, int *errp);
Aneesh Kumar K.V5c791612008-10-08 23:12:24 -04001493extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
Eric Sandeen8c3bf8a02008-10-28 00:08:12 -04001494extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
Aneesh Kumar K.Ve21675d2009-01-05 21:36:02 -05001495extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1496 ext4_fsblk_t block, unsigned long count);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001497extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1498extern void ext4_check_blocks_bitmap(struct super_block *);
Mingming Cao617ba132006-10-11 01:20:53 -07001499extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001500 ext4_group_t block_group,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001501 struct buffer_head ** bh);
Mingming Cao617ba132006-10-11 01:20:53 -07001502extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
Theodore Ts'obb23c202009-05-01 19:44:44 -04001503struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1504 ext4_group_t block_group);
1505extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1506 struct buffer_head *bh,
1507 ext4_group_t group,
1508 struct ext4_group_desc *desc);
1509#define ext4_free_blocks_after_init(sb, group, desc) \
1510 ext4_init_block_bitmap(sb, NULL, group, desc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001511
1512/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001513extern int ext4_check_dir_entry(const char *, struct inode *,
1514 struct ext4_dir_entry_2 *,
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001515 struct buffer_head *, unsigned int);
Mingming Cao617ba132006-10-11 01:20:53 -07001516extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001517 __u32 minor_hash,
Mingming Cao617ba132006-10-11 01:20:53 -07001518 struct ext4_dir_entry_2 *dirent);
1519extern void ext4_htree_free_dir_info(struct dir_private_info *p);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001520
1521/* fsync.c */
Christoph Hellwig7ea80852010-05-26 17:53:25 +02001522extern int ext4_sync_file(struct file *, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001523
1524/* hash.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001525extern int ext4fs_dirhash(const char *name, int len, struct
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001526 dx_hash_info *hinfo);
1527
1528/* ialloc.c */
Theodore Ts'of157a4a2009-06-13 11:09:42 -04001529extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
Andreas Dilger11013912009-06-13 11:45:35 -04001530 const struct qstr *qstr, __u32 goal);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001531extern void ext4_free_inode(handle_t *, struct inode *);
1532extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1533extern unsigned long ext4_count_free_inodes(struct super_block *);
1534extern unsigned long ext4_count_dirs(struct super_block *);
1535extern void ext4_check_inodes_bitmap(struct super_block *);
Theodore Ts'obb23c202009-05-01 19:44:44 -04001536extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
1537 struct buffer_head *bh,
1538 ext4_group_t group,
1539 struct ext4_group_desc *desc);
1540extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001541
Alex Tomasc9de5602008-01-29 00:19:52 -05001542/* mballoc.c */
1543extern long ext4_mb_stats;
1544extern long ext4_mb_max_to_scan;
1545extern int ext4_mb_init(struct super_block *, int);
1546extern int ext4_mb_release(struct super_block *);
1547extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1548 struct ext4_allocation_request *, int *);
1549extern int ext4_mb_reserve_blocks(struct super_block *, int);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04001550extern void ext4_discard_preallocations(struct inode *);
Alex Tomasc9de5602008-01-29 00:19:52 -05001551extern int __init init_ext4_mballoc(void);
1552extern void exit_ext4_mballoc(void);
Theodore Ts'o44338712009-11-22 07:44:56 -05001553extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
Theodore Ts'oe6362602009-11-23 07:17:05 -05001554 struct buffer_head *bh, ext4_fsblk_t block,
1555 unsigned long count, int flags);
Aneesh Kumar K.V920313a2009-01-05 21:36:19 -05001556extern int ext4_mb_add_groupinfo(struct super_block *sb,
Frederic Bohe5f21b0e2008-07-11 19:27:31 -04001557 ext4_group_t i, struct ext4_group_desc *desc);
Aneesh Kumar K.V920313a2009-01-05 21:36:19 -05001558extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1559extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1560 ext4_group_t, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001561/* inode.c */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001562struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1563 ext4_lblk_t, int, int *);
1564struct buffer_head *ext4_bread(handle_t *, struct inode *,
1565 ext4_lblk_t, int, int *);
Eric Sandeen6873fa02008-10-07 00:46:36 -04001566int ext4_get_block(struct inode *inode, sector_t iblock,
1567 struct buffer_head *bh_result, int create);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001568
David Howells1d1fe1e2008-02-07 00:15:37 -08001569extern struct inode *ext4_iget(struct super_block *, unsigned long);
Christoph Hellwiga9185b42010-03-05 09:21:37 +01001570extern int ext4_write_inode(struct inode *, struct writeback_control *);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001571extern int ext4_setattr(struct dentry *, struct iattr *);
Mingming Cao3e3398a2008-07-11 19:27:31 -04001572extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1573 struct kstat *stat);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001574extern void ext4_delete_inode(struct inode *);
1575extern int ext4_sync_inode(handle_t *, struct inode *);
Mingming Cao617ba132006-10-11 01:20:53 -07001576extern void ext4_dirty_inode(struct inode *);
1577extern int ext4_change_inode_journal_flag(struct inode *, int);
1578extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
Duane Griffin91ef4ca2008-07-11 19:27:31 -04001579extern int ext4_can_truncate(struct inode *inode);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001580extern void ext4_truncate(struct inode *);
Jan Kara487caee2009-08-17 22:17:20 -04001581extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
Mingming Cao617ba132006-10-11 01:20:53 -07001582extern void ext4_set_inode_flags(struct inode *);
Jan Karaff9ddf72007-07-18 09:24:20 -04001583extern void ext4_get_inode_flags(struct ext4_inode_info *);
Theodore Ts'occd25062009-02-26 01:04:07 -05001584extern int ext4_alloc_da_blocks(struct inode *inode);
Mingming Cao617ba132006-10-11 01:20:53 -07001585extern void ext4_set_aops(struct inode *inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07001586extern int ext4_writepage_trans_blocks(struct inode *);
Mingming Caoa02908f2008-08-19 22:16:07 -04001587extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
Mingming Caof3bd1f32008-08-19 22:16:03 -04001588extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
Jan Karacf108bc2008-07-11 19:27:31 -04001589extern int ext4_block_truncate_page(handle_t *handle,
Alex Tomasa86c6182006-10-11 01:21:03 -07001590 struct address_space *mapping, loff_t from);
Nick Pigginc2ec1752009-03-31 15:23:21 -07001591extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
Dmitry Monakhova9e7f442009-12-14 15:21:14 +03001592extern qsize_t *ext4_get_reserved_space(struct inode *inode);
Jiaying Zhangc7064ef2010-03-02 13:28:44 -05001593extern int flush_completed_IO(struct inode *inode);
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05001594extern void ext4_da_update_reserve_space(struct inode *inode,
1595 int used, int quota_claim);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001596/* ioctl.c */
Andi Kleen5cdd7b22008-04-29 22:03:54 -04001597extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001598extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001599
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -05001600/* migrate.c */
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -04001601extern int ext4_ext_migrate(struct inode *);
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001602
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001603/* namei.c */
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001604extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1605extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
Mingming Cao617ba132006-10-11 01:20:53 -07001606extern int ext4_orphan_add(handle_t *, struct inode *);
1607extern int ext4_orphan_del(handle_t *, struct inode *);
1608extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001609 __u32 start_minor_hash, __u32 *next_hash);
1610
1611/* resize.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001612extern int ext4_group_add(struct super_block *sb,
1613 struct ext4_new_group_data *input);
1614extern int ext4_group_extend(struct super_block *sb,
1615 struct ext4_super_block *es,
1616 ext4_fsblk_t n_blocks_count);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001617
1618/* super.c */
Eric Sandeen12062dd2010-02-15 14:19:27 -05001619extern void __ext4_error(struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001620 __attribute__ ((format (printf, 3, 4)));
Eric Sandeen12062dd2010-02-15 14:19:27 -05001621#define ext4_error(sb, message...) __ext4_error(sb, __func__, ## message)
Frank Mayhar273df552010-03-02 11:46:09 -05001622extern void ext4_error_inode(const char *, struct inode *, const char *, ...)
1623 __attribute__ ((format (printf, 3, 4)));
1624extern void ext4_error_file(const char *, struct file *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001625 __attribute__ ((format (printf, 3, 4)));
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001626extern void __ext4_std_error(struct super_block *, const char *, int);
1627extern void ext4_abort(struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001628 __attribute__ ((format (printf, 3, 4)));
Eric Sandeen12062dd2010-02-15 14:19:27 -05001629extern void __ext4_warning(struct super_block *, const char *,
1630 const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001631 __attribute__ ((format (printf, 3, 4)));
Eric Sandeen12062dd2010-02-15 14:19:27 -05001632#define ext4_warning(sb, message...) __ext4_warning(sb, __func__, ## message)
Eric Sandeenb31e1552009-06-04 17:36:36 -04001633extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1634 __attribute__ ((format (printf, 3, 4)));
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001635extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1636 const char *, const char *, ...)
1637 __attribute__ ((format (printf, 4, 5)));
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001638extern void ext4_update_dynamic_rev(struct super_block *sb);
Aneesh Kumar K.V99e6f822008-01-28 23:58:27 -05001639extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1640 __u32 compat);
1641extern int ext4_update_rocompat_feature(handle_t *handle,
1642 struct super_block *sb, __u32 rocompat);
1643extern int ext4_update_incompat_feature(handle_t *handle,
1644 struct super_block *sb, __u32 incompat);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001645extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1646 struct ext4_group_desc *bg);
1647extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1648 struct ext4_group_desc *bg);
1649extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1650 struct ext4_group_desc *bg);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05001651extern __u32 ext4_free_blks_count(struct super_block *sb,
1652 struct ext4_group_desc *bg);
1653extern __u32 ext4_free_inodes_count(struct super_block *sb,
1654 struct ext4_group_desc *bg);
1655extern __u32 ext4_used_dirs_count(struct super_block *sb,
1656 struct ext4_group_desc *bg);
1657extern __u32 ext4_itable_unused_count(struct super_block *sb,
1658 struct ext4_group_desc *bg);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001659extern void ext4_block_bitmap_set(struct super_block *sb,
1660 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1661extern void ext4_inode_bitmap_set(struct super_block *sb,
1662 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1663extern void ext4_inode_table_set(struct super_block *sb,
1664 struct ext4_group_desc *bg, ext4_fsblk_t blk);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05001665extern void ext4_free_blks_set(struct super_block *sb,
1666 struct ext4_group_desc *bg, __u32 count);
1667extern void ext4_free_inodes_set(struct super_block *sb,
1668 struct ext4_group_desc *bg, __u32 count);
1669extern void ext4_used_dirs_set(struct super_block *sb,
1670 struct ext4_group_desc *bg, __u32 count);
1671extern void ext4_itable_unused_set(struct super_block *sb,
1672 struct ext4_group_desc *bg, __u32 count);
Theodore Ts'obb23c202009-05-01 19:44:44 -04001673extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1674 struct ext4_group_desc *gdp);
1675extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1676 struct ext4_group_desc *gdp);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001677
1678static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1679{
1680 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001681 le32_to_cpu(es->s_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001682}
1683
1684static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1685{
1686 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001687 le32_to_cpu(es->s_r_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001688}
1689
1690static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1691{
1692 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001693 le32_to_cpu(es->s_free_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001694}
1695
1696static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1697 ext4_fsblk_t blk)
1698{
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001699 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001700 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1701}
1702
1703static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1704 ext4_fsblk_t blk)
1705{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001706 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001707 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1708}
1709
1710static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1711 ext4_fsblk_t blk)
1712{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001713 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001714 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1715}
1716
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001717static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1718{
Theodore Ts'o06a279d2009-01-17 18:41:37 -05001719 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1720 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1721 le32_to_cpu(raw_inode->i_size_lo);
1722 else
1723 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001724}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001725
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001726static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1727{
1728 raw_inode->i_size_lo = cpu_to_le32(i_size);
1729 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1730}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001731
Alex Tomasc9de5602008-01-29 00:19:52 -05001732static inline
1733struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001734 ext4_group_t group)
Alex Tomasc9de5602008-01-29 00:19:52 -05001735{
1736 struct ext4_group_info ***grp_info;
1737 long indexv, indexh;
1738 grp_info = EXT4_SB(sb)->s_group_info;
1739 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1740 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1741 return grp_info[indexv][indexh];
1742}
1743
Theodore Ts'o8df96752009-05-01 08:50:38 -04001744/*
1745 * Reading s_groups_count requires using smp_rmb() afterwards. See
1746 * the locking protocol documented in the comments of ext4_group_add()
1747 * in resize.c
1748 */
1749static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1750{
1751 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
1752
1753 smp_rmb();
1754 return ngroups;
1755}
Alex Tomasc9de5602008-01-29 00:19:52 -05001756
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001757static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1758 ext4_group_t block_group)
1759{
1760 return block_group >> sbi->s_log_groups_per_flex;
1761}
1762
1763static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1764{
1765 return 1 << sbi->s_log_groups_per_flex;
1766}
1767
Mingming Cao617ba132006-10-11 01:20:53 -07001768#define ext4_std_error(sb, errno) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001769do { \
1770 if ((errno)) \
Stoyan Gaydarov4db9c542008-07-13 21:03:29 -04001771 __ext4_std_error((sb), __func__, (errno)); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001772} while (0)
1773
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04001774#ifdef CONFIG_SMP
Eric Dumazet179f7eb2009-01-06 14:41:04 -08001775/* Each CPU can accumulate percpu_counter_batch blocks in their local
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04001776 * counters. So we need to make sure we have free blocks more
Eric Dumazet179f7eb2009-01-06 14:41:04 -08001777 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04001778 */
Eric Dumazet179f7eb2009-01-06 14:41:04 -08001779#define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04001780#else
1781#define EXT4_FREEBLOCKS_WATERMARK 0
1782#endif
1783
Aneesh Kumar K.Vcf17fea2008-09-13 13:06:18 -04001784static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1785{
1786 /*
1787 * XXX: replace with spinlock if seen contended -bzzz
1788 */
1789 down_write(&EXT4_I(inode)->i_data_sem);
1790 if (newsize > EXT4_I(inode)->i_disksize)
1791 EXT4_I(inode)->i_disksize = newsize;
1792 up_write(&EXT4_I(inode)->i_data_sem);
1793 return ;
1794}
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04001795
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001796struct ext4_group_info {
1797 unsigned long bb_state;
1798 struct rb_root bb_free_root;
Eric Sandeena36b4492009-08-25 22:36:45 -04001799 ext4_grpblk_t bb_first_free; /* first free block */
1800 ext4_grpblk_t bb_free; /* total free blocks */
1801 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
Curt Wohlgemuth8a57d9d2010-05-16 15:00:00 -04001802 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001803 struct list_head bb_prealloc_list;
1804#ifdef DOUBLE_CHECK
1805 void *bb_bitmap;
1806#endif
1807 struct rw_semaphore alloc_sem;
Eric Sandeena36b4492009-08-25 22:36:45 -04001808 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
1809 * regions, index is order.
1810 * bb_counters[3] = 5 means
1811 * 5 free 8-block regions. */
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001812};
1813
1814#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001815
1816#define EXT4_MB_GRP_NEED_INIT(grp) \
1817 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1818
Theodore Ts'o50797482009-09-18 13:34:02 -04001819#define EXT4_MAX_CONTENTION 8
1820#define EXT4_CONTENTION_THRESHOLD 2
1821
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04001822static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1823 ext4_group_t group)
1824{
1825 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1826}
1827
Theodore Ts'o50797482009-09-18 13:34:02 -04001828/*
1829 * Returns true if the filesystem is busy enough that attempts to
1830 * access the block group locks has run into contention.
1831 */
1832static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
1833{
1834 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
1835}
1836
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001837static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1838{
Theodore Ts'o50797482009-09-18 13:34:02 -04001839 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
1840 if (spin_trylock(lock))
1841 /*
1842 * We're able to grab the lock right away, so drop the
1843 * lock contention counter.
1844 */
1845 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
1846 else {
1847 /*
1848 * The lock is busy, so bump the contention counter,
1849 * and then wait on the spin lock.
1850 */
1851 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
1852 EXT4_MAX_CONTENTION);
1853 spin_lock(lock);
1854 }
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001855}
1856
1857static inline void ext4_unlock_group(struct super_block *sb,
1858 ext4_group_t group)
1859{
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04001860 spin_unlock(ext4_group_lock_ptr(sb, group));
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001861}
1862
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001863/*
1864 * Inodes and files operations
1865 */
1866
1867/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001868extern const struct file_operations ext4_dir_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001869
1870/* file.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001871extern const struct inode_operations ext4_file_inode_operations;
Mingming Cao617ba132006-10-11 01:20:53 -07001872extern const struct file_operations ext4_file_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001873
1874/* namei.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001875extern const struct inode_operations ext4_dir_inode_operations;
1876extern const struct inode_operations ext4_special_inode_operations;
Theodore Ts'o596397b2009-05-01 13:49:15 -04001877extern struct dentry *ext4_get_parent(struct dentry *child);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001878
1879/* symlink.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001880extern const struct inode_operations ext4_symlink_inode_operations;
1881extern const struct inode_operations ext4_fast_symlink_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001882
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04001883/* block_validity */
1884extern void ext4_release_system_zone(struct super_block *sb);
1885extern int ext4_setup_system_zone(struct super_block *sb);
1886extern int __init init_ext4_system_zone(void);
1887extern void exit_ext4_system_zone(void);
1888extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
1889 ext4_fsblk_t start_blk,
1890 unsigned int count);
1891
Alex Tomasa86c6182006-10-11 01:21:03 -07001892/* extents.c */
1893extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1894extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
Mingming Caoa02908f2008-08-19 22:16:07 -04001895extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1896 int chunk);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04001897extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
1898 struct ext4_map_blocks *map, int flags);
Jan Karacf108bc2008-07-11 19:27:31 -04001899extern void ext4_ext_truncate(struct inode *);
Alex Tomasa86c6182006-10-11 01:21:03 -07001900extern void ext4_ext_init(struct super_block *);
1901extern void ext4_ext_release(struct super_block *);
Amit Aroraa2df2a62007-07-17 21:42:41 -04001902extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1903 loff_t len);
Mingming Cao00314622009-09-28 15:49:08 -04001904extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
Eric Sandeena1de02d2010-02-04 23:58:38 -05001905 ssize_t len);
Theodore Ts'oe35fd662010-05-16 19:00:00 -04001906extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
1907 struct ext4_map_blocks *map, int flags);
Theodore Ts'o12b7ac12009-05-14 00:57:44 -04001908extern int ext4_get_blocks(handle_t *handle, struct inode *inode,
1909 sector_t block, unsigned int max_blocks,
Theodore Ts'oc2177052009-05-14 00:58:52 -04001910 struct buffer_head *bh, int flags);
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001911extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1912 __u64 start, __u64 len);
Akira Fujita748de672009-06-17 19:24:03 -04001913/* move_extent.c */
1914extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
1915 __u64 start_orig, __u64 start_donor,
1916 __u64 len, __u64 *moved_len);
1917
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001918
Jiaying Zhang744692d2010-03-04 16:14:02 -05001919/* BH_Uninit flag: blocks are allocated but uninitialized on disk */
1920enum ext4_state_bits {
1921 BH_Uninit /* blocks are allocated but uninitialized on disk */
1922 = BH_JBDPrivateStart,
1923};
1924
1925BUFFER_FNS(Uninit, uninit)
1926TAS_BUFFER_FNS(Uninit, uninit)
1927
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -05001928/*
1929 * Add new method to test wether block and inode bitmaps are properly
1930 * initialized. With uninit_bg reading the block from disk is not enough
1931 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1932 */
1933#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1934
1935static inline int bitmap_uptodate(struct buffer_head *bh)
1936{
1937 return (buffer_uptodate(bh) &&
1938 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1939}
1940static inline void set_bitmap_uptodate(struct buffer_head *bh)
1941{
1942 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1943}
1944
Akinobu Mita731eb1a2010-03-03 23:55:01 -05001945#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
1946
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001947#endif /* __KERNEL__ */
1948
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04001949#endif /* _EXT4_H */