blob: 9714db393efe8a1b6fa2ff0b2e7cf36fb7ecc199 [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>
Alex Tomasc9de5602008-01-29 00:19:52 -050032
Dave Kleikampac27a0e2006-10-11 01:20:50 -070033/*
Shen Feng8a356942008-07-11 19:27:31 -040034 * The fourth extended filesystem constants/structures
Dave Kleikampac27a0e2006-10-11 01:20:50 -070035 */
36
37/*
Mingming Cao617ba132006-10-11 01:20:53 -070038 * Define EXT4FS_DEBUG to produce debug messages
Dave Kleikampac27a0e2006-10-11 01:20:50 -070039 */
Mingming Cao617ba132006-10-11 01:20:53 -070040#undef EXT4FS_DEBUG
Dave Kleikampac27a0e2006-10-11 01:20:50 -070041
42/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -070043 * Debug code
44 */
Mingming Cao617ba132006-10-11 01:20:53 -070045#ifdef EXT4FS_DEBUG
46#define ext4_debug(f, a...) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070047 do { \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040048 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
Stoyan Gaydarov4db9c542008-07-13 21:03:29 -040049 __FILE__, __LINE__, __func__); \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040050 printk(KERN_DEBUG f, ## a); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070051 } while (0)
52#else
Mingming Cao617ba132006-10-11 01:20:53 -070053#define ext4_debug(f, a...) do {} while (0)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070054#endif
55
Theodore Ts'od444c3c2009-05-01 13:44:33 -040056/* data type for block offset of block group */
57typedef int ext4_grpblk_t;
58
59/* data type for filesystem-wide blocks number */
60typedef unsigned long long ext4_fsblk_t;
61
62/* data type for file logical block number */
63typedef __u32 ext4_lblk_t;
64
65/* data type for block group number */
66typedef unsigned int ext4_group_t;
67
68
Alex Tomasc9de5602008-01-29 00:19:52 -050069/* prefer goal again. length */
70#define EXT4_MB_HINT_MERGE 1
71/* blocks already reserved */
72#define EXT4_MB_HINT_RESERVED 2
73/* metadata is being allocated */
74#define EXT4_MB_HINT_METADATA 4
75/* first blocks in the file */
76#define EXT4_MB_HINT_FIRST 8
77/* search for the best chunk */
78#define EXT4_MB_HINT_BEST 16
79/* data is being allocated */
80#define EXT4_MB_HINT_DATA 32
81/* don't preallocate (for tails) */
82#define EXT4_MB_HINT_NOPREALLOC 64
83/* allocate for locality group */
84#define EXT4_MB_HINT_GROUP_ALLOC 128
85/* allocate goal blocks or none */
86#define EXT4_MB_HINT_GOAL_ONLY 256
87/* goal is meaningful */
88#define EXT4_MB_HINT_TRY_GOAL 512
Mingming Caod2a17632008-07-14 17:52:37 -040089/* blocks already pre-reserved by delayed allocation */
90#define EXT4_MB_DELALLOC_RESERVED 1024
91
Alex Tomasc9de5602008-01-29 00:19:52 -050092
93struct ext4_allocation_request {
94 /* target inode for block we're allocating */
95 struct inode *inode;
Alex Tomasc9de5602008-01-29 00:19:52 -050096 /* how many blocks we want to allocate */
Theodore Ts'o498e5f22008-11-05 00:14:04 -050097 unsigned int len;
Eric Sandeen726447d2009-07-13 10:24:17 -040098 /* logical block in target inode */
99 ext4_lblk_t logical;
100 /* the closest logical allocated block to the left */
101 ext4_lblk_t lleft;
102 /* the closest logical allocated block to the right */
103 ext4_lblk_t lright;
104 /* phys. target (a hint) */
105 ext4_fsblk_t goal;
106 /* phys. block for the closest logical allocated block to the left */
107 ext4_fsblk_t pleft;
108 /* phys. block for the closest logical allocated block to the right */
109 ext4_fsblk_t pright;
Alex Tomasc9de5602008-01-29 00:19:52 -0500110 /* flags. see above EXT4_MB_HINT_* */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500111 unsigned int flags;
Alex Tomasc9de5602008-01-29 00:19:52 -0500112};
113
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700114/*
115 * Special inodes numbers
116 */
Mingming Cao617ba132006-10-11 01:20:53 -0700117#define EXT4_BAD_INO 1 /* Bad blocks inode */
118#define EXT4_ROOT_INO 2 /* Root inode */
119#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
120#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
121#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
122#define EXT4_JOURNAL_INO 8 /* Journal inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700123
Mingming Cao617ba132006-10-11 01:20:53 -0700124/* First non-reserved inode for old ext4 filesystems */
125#define EXT4_GOOD_OLD_FIRST_INO 11
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700126
127/*
128 * Maximal count of links to a file
129 */
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400130#define EXT4_LINK_MAX 65000
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700131
132/*
133 * Macro-instructions used to manage several block sizes
134 */
Mingming Cao617ba132006-10-11 01:20:53 -0700135#define EXT4_MIN_BLOCK_SIZE 1024
Takashi Satoafc7cbc2008-01-28 23:58:27 -0500136#define EXT4_MAX_BLOCK_SIZE 65536
137#define EXT4_MIN_BLOCK_LOG_SIZE 10
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700138#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700139# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700140#else
Mingming Cao617ba132006-10-11 01:20:53 -0700141# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700142#endif
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400143#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700144#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700145# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700146#else
Mingming Cao617ba132006-10-11 01:20:53 -0700147# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700148#endif
149#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700150#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
151#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
152#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700153#else
Mingming Cao617ba132006-10-11 01:20:53 -0700154#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
155 EXT4_GOOD_OLD_INODE_SIZE : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700156 (s)->s_inode_size)
Mingming Cao617ba132006-10-11 01:20:53 -0700157#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
158 EXT4_GOOD_OLD_FIRST_INO : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700159 (s)->s_first_ino)
160#endif
Amit Aroraa2df2a62007-07-17 21:42:41 -0400161#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700162
163/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700164 * Structure of a blocks group descriptor
165 */
Mingming Cao617ba132006-10-11 01:20:53 -0700166struct ext4_group_desc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700167{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400168 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400169 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
170 __le32 bg_inode_table_lo; /* Inodes table block */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500171 __le16 bg_free_blocks_count_lo;/* Free blocks count */
172 __le16 bg_free_inodes_count_lo;/* Free inodes count */
173 __le16 bg_used_dirs_count_lo; /* Directories count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400174 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
175 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500176 __le16 bg_itable_unused_lo; /* Unused inodes count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400177 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700178 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
179 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
180 __le32 bg_inode_table_hi; /* Inodes table block MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500181 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
182 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
183 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500184 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500185 __u32 bg_reserved2[3];
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700186};
187
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400188/*
189 * Structure of a flex block group info
190 */
191
192struct flex_groups {
Theodore Ts'o9f24e422009-03-04 19:09:10 -0500193 atomic_t free_inodes;
194 atomic_t free_blocks;
Theodore Ts'o7d39db12009-03-04 19:31:53 -0500195 atomic_t used_dirs;
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400196};
197
Andreas Dilger717d50e2007-10-16 18:38:25 -0400198#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
199#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
200#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
201
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700202/*
203 * Macro-instructions used to manage group descriptors
204 */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700205#define EXT4_MIN_DESC_SIZE 32
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700206#define EXT4_MIN_DESC_SIZE_64BIT 64
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700207#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
208#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700209#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700210# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
211# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
212# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
213# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700214#else
Mingming Cao617ba132006-10-11 01:20:53 -0700215# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700216# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
Mingming Cao617ba132006-10-11 01:20:53 -0700217# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700218#endif
219
220/*
221 * Constants relative to the data blocks
222 */
Mingming Cao617ba132006-10-11 01:20:53 -0700223#define EXT4_NDIR_BLOCKS 12
224#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
225#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
226#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
227#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700228
229/*
230 * Inode flags
231 */
Mingming Cao617ba132006-10-11 01:20:53 -0700232#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
233#define EXT4_UNRM_FL 0x00000002 /* Undelete */
234#define EXT4_COMPR_FL 0x00000004 /* Compress file */
235#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
236#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
237#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
238#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
239#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700240/* Reserved for compression usage... */
Mingming Cao617ba132006-10-11 01:20:53 -0700241#define EXT4_DIRTY_FL 0x00000100
242#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
243#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
244#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700245/* End compression flags --- maybe not all used */
Mingming Cao617ba132006-10-11 01:20:53 -0700246#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
247#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
248#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
249#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
250#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
251#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500252#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
Alex Tomasa86c6182006-10-11 01:21:03 -0700253#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400254#define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500255#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700256
Alex Tomasa86c6182006-10-11 01:21:03 -0700257#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
Aneesh Kumar K.V4db46fc2008-10-08 23:34:06 -0400258#define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700259
Duane Griffin8fa43a82009-02-15 18:57:26 -0500260/* Flags that should be inherited by new inodes from their parent. */
261#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
262 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
263 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
264 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
265 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
266
Duane Griffin2dc6b0d2009-02-15 18:09:20 -0500267/* Flags that are appropriate for regular files (all but dir-specific ones). */
268#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
269
270/* Flags that are appropriate for non-directories/regular files. */
271#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
272
273/* Mask out flags that are inappropriate for the given type of inode. */
274static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
275{
276 if (S_ISDIR(mode))
277 return flags;
278 else if (S_ISREG(mode))
279 return flags & EXT4_REG_FLMASK;
280 else
281 return flags & EXT4_OTHER_FLMASK;
282}
283
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700284/*
285 * Inode dynamic state flags
286 */
Mingming Cao617ba132006-10-11 01:20:53 -0700287#define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
288#define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
289#define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
Kalpak Shah6dd4ee72007-07-18 09:19:57 -0400290#define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
Theodore Ts'o7d8f9f72009-02-24 08:21:14 -0500291#define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700292
293/* Used to pass group descriptor data when online resize is done */
Mingming Cao617ba132006-10-11 01:20:53 -0700294struct ext4_new_group_input {
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400295 __u32 group; /* Group number for this data */
296 __u64 block_bitmap; /* Absolute block number of block bitmap */
297 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
298 __u64 inode_table; /* Absolute block number of inode table start */
299 __u32 blocks_count; /* Total number of blocks in this group */
300 __u16 reserved_blocks; /* Number of reserved blocks in this group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700301 __u16 unused;
302};
303
Mingming Cao617ba132006-10-11 01:20:53 -0700304/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
305struct ext4_new_group_data {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700306 __u32 group;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700307 __u64 block_bitmap;
308 __u64 inode_bitmap;
309 __u64 inode_table;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700310 __u32 blocks_count;
311 __u16 reserved_blocks;
312 __u16 unused;
313 __u32 free_blocks_count;
314};
315
Amit Aroraa2df2a62007-07-17 21:42:41 -0400316/*
Theodore Ts'oc2177052009-05-14 00:58:52 -0400317 * Flags used by ext4_get_blocks()
Amit Aroraa2df2a62007-07-17 21:42:41 -0400318 */
Theodore Ts'oc2177052009-05-14 00:58:52 -0400319 /* Allocate any needed blocks and/or convert an unitialized
320 extent to be an initialized ext4 */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400321#define EXT4_GET_BLOCKS_CREATE 0x0001
Theodore Ts'oc2177052009-05-14 00:58:52 -0400322 /* Request the creation of an unitialized extent */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400323#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
Theodore Ts'oc2177052009-05-14 00:58:52 -0400324#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
325 EXT4_GET_BLOCKS_CREATE)
Theodore Ts'oc2177052009-05-14 00:58:52 -0400326 /* Caller is from the delayed allocation writeout path,
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400327 so set the magic i_delalloc_reserve_flag after taking the
328 inode allocation semaphore for */
Jan Kara03f5d8b2009-06-09 00:17:05 -0400329#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400330 /* Call ext4_da_update_reserve_space() after successfully
331 allocating the blocks */
Jan Kara03f5d8b2009-06-09 00:17:05 -0400332#define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0008
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400333
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700334
335/*
336 * ioctl commands
337 */
Mingming Cao617ba132006-10-11 01:20:53 -0700338#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
339#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
340#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
341#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
Mingming Cao617ba132006-10-11 01:20:53 -0700342#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
343#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
Jose R. Santose23291b2007-07-18 08:57:06 -0400344#ifdef CONFIG_JBD2_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700345#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700346#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700347#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
348#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400349#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
350#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
351#define EXT4_IOC_MIGRATE _IO('f', 9)
Theodore Ts'occd25062009-02-26 01:04:07 -0500352 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400353 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
Theodore Ts'occd25062009-02-26 01:04:07 -0500354#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
Akira Fujita748de672009-06-17 19:24:03 -0400355#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700356
357/*
358 * ioctl commands in 32 bit emulation
359 */
Mingming Cao617ba132006-10-11 01:20:53 -0700360#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
361#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
362#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
363#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
364#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
365#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
366#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
Jose R. Santose23291b2007-07-18 08:57:06 -0400367#ifdef CONFIG_JBD2_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700368#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700369#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700370#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
371#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700372
373
374/*
375 * Mount options
376 */
Mingming Cao617ba132006-10-11 01:20:53 -0700377struct ext4_mount_options {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700378 unsigned long s_mount_opt;
379 uid_t s_resuid;
380 gid_t s_resgid;
381 unsigned long s_commit_interval;
Theodore Ts'o30773842009-01-03 20:27:38 -0500382 u32 s_min_batch_time, s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700383#ifdef CONFIG_QUOTA
384 int s_jquota_fmt;
385 char *s_qf_names[MAXQUOTAS];
386#endif
387};
388
389/*
390 * Structure of an inode on the disk
391 */
Mingming Cao617ba132006-10-11 01:20:53 -0700392struct ext4_inode {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700393 __le16 i_mode; /* File mode */
394 __le16 i_uid; /* Low 16 bits of Owner Uid */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500395 __le32 i_size_lo; /* Size in bytes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700396 __le32 i_atime; /* Access time */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400397 __le32 i_ctime; /* Inode Change time */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700398 __le32 i_mtime; /* Modification time */
399 __le32 i_dtime; /* Deletion Time */
400 __le16 i_gid; /* Low 16 bits of Group Id */
401 __le16 i_links_count; /* Links count */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500402 __le32 i_blocks_lo; /* Blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700403 __le32 i_flags; /* File flags */
404 union {
405 struct {
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500406 __le32 l_i_version;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700407 } linux1;
408 struct {
409 __u32 h_i_translator;
410 } hurd1;
411 struct {
412 __u32 m_i_reserved1;
413 } masix1;
414 } osd1; /* OS dependent 1 */
Mingming Cao617ba132006-10-11 01:20:53 -0700415 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700416 __le32 i_generation; /* File version (for NFS) */
Aneesh Kumar K.V7973c0c2008-01-28 23:58:27 -0500417 __le32 i_file_acl_lo; /* File ACL */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500418 __le32 i_size_high;
Coly Lif077d0d2007-10-16 18:38:25 -0400419 __le32 i_obso_faddr; /* Obsoleted fragment address */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700420 union {
421 struct {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500422 __le16 l_i_blocks_high; /* were l_i_reserved1 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700423 __le16 l_i_file_acl_high;
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400424 __le16 l_i_uid_high; /* these 2 fields */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700425 __le16 l_i_gid_high; /* were reserved2[0] */
426 __u32 l_i_reserved2;
427 } linux2;
428 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400429 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700430 __u16 h_i_mode_high;
431 __u16 h_i_uid_high;
432 __u16 h_i_gid_high;
433 __u32 h_i_author;
434 } hurd2;
435 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400436 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700437 __le16 m_i_file_acl_high;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700438 __u32 m_i_reserved2[2];
439 } masix2;
440 } osd2; /* OS dependent 2 */
441 __le16 i_extra_isize;
442 __le16 i_pad1;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400443 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
444 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
445 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
446 __le32 i_crtime; /* File Creation time */
447 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500448 __le32 i_version_hi; /* high 32 bits for 64-bit version */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700449};
450
Akira Fujita748de672009-06-17 19:24:03 -0400451struct move_extent {
452 __u32 reserved; /* should be zero */
453 __u32 donor_fd; /* donor file descriptor */
454 __u64 orig_start; /* logical start offset in block for orig */
455 __u64 donor_start; /* logical start offset in block for donor */
456 __u64 len; /* block length to be moved */
457 __u64 moved_len; /* moved block length */
458};
459#define MAX_DEFRAG_SIZE ((1UL<<31) - 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700460
Kalpak Shahef7f3832007-07-18 09:15:20 -0400461#define EXT4_EPOCH_BITS 2
462#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
463#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
464
465/*
466 * Extended fields will fit into an inode if the filesystem was formatted
467 * with large inodes (-I 256 or larger) and there are not currently any EAs
468 * consuming all of the available space. For new inodes we always reserve
469 * enough space for the kernel's known extended fields, but for inodes
470 * created with an old kernel this might not have been the case. None of
471 * the extended inode fields is critical for correct filesystem operation.
472 * This macro checks if a certain field fits in the inode. Note that
473 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
474 */
475#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
476 ((offsetof(typeof(*ext4_inode), field) + \
477 sizeof((ext4_inode)->field)) \
478 <= (EXT4_GOOD_OLD_INODE_SIZE + \
479 (einode)->i_extra_isize)) \
480
481static inline __le32 ext4_encode_extra_time(struct timespec *time)
482{
483 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
484 time->tv_sec >> 32 : 0) |
485 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
486}
487
488static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
489{
490 if (sizeof(time->tv_sec) > 4)
491 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
492 << 32;
493 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
494}
495
496#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
497do { \
498 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
499 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
500 (raw_inode)->xtime ## _extra = \
501 ext4_encode_extra_time(&(inode)->xtime); \
502} while (0)
503
504#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
505do { \
506 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
507 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
508 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
509 (raw_inode)->xtime ## _extra = \
510 ext4_encode_extra_time(&(einode)->xtime); \
511} while (0)
512
513#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
514do { \
515 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
516 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
517 ext4_decode_extra_time(&(inode)->xtime, \
518 raw_inode->xtime ## _extra); \
519} while (0)
520
521#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
522do { \
523 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
524 (einode)->xtime.tv_sec = \
525 (signed)le32_to_cpu((raw_inode)->xtime); \
526 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
527 ext4_decode_extra_time(&(einode)->xtime, \
528 raw_inode->xtime ## _extra); \
529} while (0)
530
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500531#define i_disk_version osd1.linux1.l_i_version
532
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700533#if defined(__KERNEL__) || defined(__linux__)
534#define i_reserved1 osd1.linux1.l_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700535#define i_file_acl_high osd2.linux2.l_i_file_acl_high
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500536#define i_blocks_high osd2.linux2.l_i_blocks_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700537#define i_uid_low i_uid
538#define i_gid_low i_gid
539#define i_uid_high osd2.linux2.l_i_uid_high
540#define i_gid_high osd2.linux2.l_i_gid_high
541#define i_reserved2 osd2.linux2.l_i_reserved2
542
543#elif defined(__GNU__)
544
545#define i_translator osd1.hurd1.h_i_translator
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700546#define i_uid_high osd2.hurd2.h_i_uid_high
547#define i_gid_high osd2.hurd2.h_i_gid_high
548#define i_author osd2.hurd2.h_i_author
549
550#elif defined(__masix__)
551
552#define i_reserved1 osd1.masix1.m_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700553#define i_file_acl_high osd2.masix2.m_i_file_acl_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700554#define i_reserved2 osd2.masix2.m_i_reserved2
555
556#endif /* defined(__KERNEL__) || defined(__linux__) */
557
558/*
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400559 * storage for cached extent
560 */
561struct ext4_ext_cache {
562 ext4_fsblk_t ec_start;
563 ext4_lblk_t ec_block;
564 __u32 ec_len; /* must be 32bit to return holes */
565 __u32 ec_type;
566};
567
568/*
569 * fourth extended file system inode data in memory
570 */
571struct ext4_inode_info {
572 __le32 i_data[15]; /* unconverted */
573 __u32 i_flags;
574 ext4_fsblk_t i_file_acl;
575 __u32 i_dtime;
576
577 /*
578 * i_block_group is the number of the block group which contains
579 * this file's inode. Constant across the lifetime of the inode,
580 * it is ued for making block allocation decisions - we try to
581 * place a file's data blocks near its inode block, and new inodes
582 * near to their parent directory's inode.
583 */
584 ext4_group_t i_block_group;
585 __u32 i_state; /* Dynamic state flags for ext4 */
586
587 ext4_lblk_t i_dir_start_lookup;
588#ifdef CONFIG_EXT4_FS_XATTR
589 /*
590 * Extended attributes can be read independently of the main file
591 * data. Taking i_mutex even when reading would cause contention
592 * between readers of EAs and writers of regular file data, so
593 * instead we synchronize on xattr_sem when reading or changing
594 * EAs.
595 */
596 struct rw_semaphore xattr_sem;
597#endif
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400598
599 struct list_head i_orphan; /* unlinked but open inodes */
600
601 /*
602 * i_disksize keeps track of what the inode size is ON DISK, not
603 * in memory. During truncate, i_size is set to the new size by
604 * the VFS prior to calling ext4_truncate(), but the filesystem won't
605 * set i_disksize to 0 until the truncate is actually under way.
606 *
607 * The intent is that i_disksize always represents the blocks which
608 * are used by this file. This allows recovery to restart truncate
609 * on orphans if we crash during truncate. We actually write i_disksize
610 * into the on-disk inode when writing inodes out, instead of i_size.
611 *
612 * The only time when i_disksize and i_size may be different is when
613 * a truncate is in progress. The only things which change i_disksize
614 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
615 */
616 loff_t i_disksize;
617
618 /*
619 * i_data_sem is for serialising ext4_truncate() against
620 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
621 * data tree are chopped off during truncate. We can't do that in
622 * ext4 because whenever we perform intermediate commits during
623 * truncate, the inode and all the metadata blocks *must* be in a
624 * consistent state which allows truncation of the orphans to restart
625 * during recovery. Hence we must fix the get_block-vs-truncate race
626 * by other means, so we have i_data_sem.
627 */
628 struct rw_semaphore i_data_sem;
629 struct inode vfs_inode;
630 struct jbd2_inode jinode;
631
632 struct ext4_ext_cache i_cached_extent;
633 /*
634 * File creation time. Its function is same as that of
635 * struct timespec i_{a,c,m}time in the generic inode.
636 */
637 struct timespec i_crtime;
638
639 /* mballoc */
640 struct list_head i_prealloc_list;
641 spinlock_t i_prealloc_lock;
642
643 /* ialloc */
644 ext4_group_t i_last_alloc_group;
645
646 /* allocation reservation info for delalloc */
647 unsigned int i_reserved_data_blocks;
648 unsigned int i_reserved_meta_blocks;
649 unsigned int i_allocated_meta_blocks;
650 unsigned short i_delalloc_reserved_flag;
651
652 /* on-disk additional length */
653 __u16 i_extra_isize;
654
655 spinlock_t i_block_reservation_lock;
656};
657
658/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700659 * File system states
660 */
Mingming Cao617ba132006-10-11 01:20:53 -0700661#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
662#define EXT4_ERROR_FS 0x0002 /* Errors detected */
663#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700664
665/*
Theodore Tso469108f2008-02-10 01:11:44 -0500666 * Misc. filesystem flags
667 */
668#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
669#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
670#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
671
672/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700673 * Mount flags
674 */
Mingming Cao617ba132006-10-11 01:20:53 -0700675#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
676#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
677#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
678#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
679#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
680#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
681#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
682#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
Mingming Cao617ba132006-10-11 01:20:53 -0700683#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
684#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
685#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
686#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
687#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
688#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
689#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
690#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
Theodore Ts'oafd46722009-03-16 23:12:23 -0400691#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
Mingming Cao617ba132006-10-11 01:20:53 -0700692#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
693#define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
694#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
695#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
696#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
Girish Shilamkar818d2762008-01-28 23:58:27 -0500697#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
698#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500699#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
Alex Tomas64769242008-07-11 19:27:31 -0400700#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400701#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400702#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400703
Mingming Cao617ba132006-10-11 01:20:53 -0700704#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
705#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
706#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
707 EXT4_MOUNT_##opt)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700708
Mingming Cao617ba132006-10-11 01:20:53 -0700709#define ext4_set_bit ext2_set_bit
710#define ext4_set_bit_atomic ext2_set_bit_atomic
711#define ext4_clear_bit ext2_clear_bit
712#define ext4_clear_bit_atomic ext2_clear_bit_atomic
713#define ext4_test_bit ext2_test_bit
714#define ext4_find_first_zero_bit ext2_find_first_zero_bit
715#define ext4_find_next_zero_bit ext2_find_next_zero_bit
Aneesh Kumar K.Vaa02ad62008-01-28 23:58:27 -0500716#define ext4_find_next_bit ext2_find_next_bit
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700717
718/*
719 * Maximal mount counts between two filesystem checks
720 */
Mingming Cao617ba132006-10-11 01:20:53 -0700721#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
722#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700723
724/*
725 * Behaviour when detecting errors
726 */
Mingming Cao617ba132006-10-11 01:20:53 -0700727#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
728#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
729#define EXT4_ERRORS_PANIC 3 /* Panic */
730#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700731
732/*
733 * Structure of the super block
734 */
Mingming Cao617ba132006-10-11 01:20:53 -0700735struct ext4_super_block {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700736/*00*/ __le32 s_inodes_count; /* Inodes count */
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -0400737 __le32 s_blocks_count_lo; /* Blocks count */
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -0400738 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
739 __le32 s_free_blocks_count_lo; /* Free blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700740/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
741 __le32 s_first_data_block; /* First Data Block */
742 __le32 s_log_block_size; /* Block size */
Coly Lif077d0d2007-10-16 18:38:25 -0400743 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700744/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
Coly Lif077d0d2007-10-16 18:38:25 -0400745 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700746 __le32 s_inodes_per_group; /* # Inodes per group */
747 __le32 s_mtime; /* Mount time */
748/*30*/ __le32 s_wtime; /* Write time */
749 __le16 s_mnt_count; /* Mount count */
750 __le16 s_max_mnt_count; /* Maximal mount count */
751 __le16 s_magic; /* Magic signature */
752 __le16 s_state; /* File system state */
753 __le16 s_errors; /* Behaviour when detecting errors */
754 __le16 s_minor_rev_level; /* minor revision level */
755/*40*/ __le32 s_lastcheck; /* time of last check */
756 __le32 s_checkinterval; /* max. time between checks */
757 __le32 s_creator_os; /* OS */
758 __le32 s_rev_level; /* Revision level */
759/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
760 __le16 s_def_resgid; /* Default gid for reserved blocks */
761 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700762 * These fields are for EXT4_DYNAMIC_REV superblocks only.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700763 *
764 * Note: the difference between the compatible feature set and
765 * the incompatible feature set is that if there is a bit set
766 * in the incompatible feature set that the kernel doesn't
767 * know about, it should refuse to mount the filesystem.
768 *
769 * e2fsck's requirements are more strict; if it doesn't know
770 * about a feature in either the compatible or incompatible
771 * feature set, it must abort and not try to meddle with
772 * things it doesn't understand...
773 */
774 __le32 s_first_ino; /* First non-reserved inode */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700775 __le16 s_inode_size; /* size of inode structure */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700776 __le16 s_block_group_nr; /* block group # of this superblock */
777 __le32 s_feature_compat; /* compatible feature set */
778/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
779 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
780/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
781/*78*/ char s_volume_name[16]; /* volume name */
782/*88*/ char s_last_mounted[64]; /* directory where last mounted */
783/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
784 /*
785 * Performance hints. Directory preallocation should only
Mingming Cao617ba132006-10-11 01:20:53 -0700786 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700787 */
788 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
789 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
790 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
791 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700792 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700793 */
794/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
795/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
796 __le32 s_journal_dev; /* device number of journal file */
797 __le32 s_last_orphan; /* start of list of inodes to delete */
798 __le32 s_hash_seed[4]; /* HTREE hash seed */
799 __u8 s_def_hash_version; /* Default hash version to use */
800 __u8 s_reserved_char_pad;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700801 __le16 s_desc_size; /* size of group descriptor */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700802/*100*/ __le32 s_default_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700803 __le32 s_first_meta_bg; /* First metablock block group */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700804 __le32 s_mkfs_time; /* When the filesystem was created */
805 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
806 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
807/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
808 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
809 __le32 s_free_blocks_count_hi; /* Free blocks count */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -0400810 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
811 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
812 __le32 s_flags; /* Miscellaneous flags */
813 __le16 s_raid_stride; /* RAID stride */
814 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
815 __le64 s_mmp_block; /* Block for multi-mount protection */
816 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400817 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
818 __u8 s_reserved_char_pad2;
819 __le16 s_reserved_pad;
Theodore Ts'oafc32f72009-02-28 19:39:58 -0500820 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
821 __u32 s_reserved[160]; /* Padding to the end of the block */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700822};
823
824#ifdef __KERNEL__
Theodore Ts'obc0b0d62009-06-13 10:09:48 -0400825
826/*
Theodore Ts'o4ab2f152009-06-13 10:09:36 -0400827 * run-time mount flags
Theodore Ts'obc0b0d62009-06-13 10:09:48 -0400828 */
829#define EXT4_MF_MNTDIR_SAMPLED 0x0001
Theodore Ts'o4ab2f152009-06-13 10:09:36 -0400830#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
Theodore Ts'obc0b0d62009-06-13 10:09:48 -0400831
Theodore Ts'oca0faba2009-05-03 16:33:44 -0400832/*
833 * fourth extended-fs super-block data in memory
834 */
835struct ext4_sb_info {
836 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
837 unsigned long s_inodes_per_block;/* Number of inodes per block */
838 unsigned long s_blocks_per_group;/* Number of blocks in a group */
839 unsigned long s_inodes_per_group;/* Number of inodes in a group */
840 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
841 unsigned long s_gdb_count; /* Number of group descriptor blocks */
842 unsigned long s_desc_per_block; /* Number of group descriptors per block */
843 ext4_group_t s_groups_count; /* Number of groups in the fs */
844 unsigned long s_overhead_last; /* Last calculated overhead */
845 unsigned long s_blocks_last; /* Last seen block count */
846 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
847 struct buffer_head * s_sbh; /* Buffer containing the super block */
848 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
849 struct buffer_head **s_group_desc;
Theodore Ts'o7f4520c2009-06-13 10:09:41 -0400850 unsigned int s_mount_opt;
Theodore Ts'obc0b0d62009-06-13 10:09:48 -0400851 unsigned int s_mount_flags;
Theodore Ts'oca0faba2009-05-03 16:33:44 -0400852 ext4_fsblk_t s_sb_block;
853 uid_t s_resuid;
854 gid_t s_resgid;
855 unsigned short s_mount_state;
856 unsigned short s_pad;
857 int s_addr_per_block_bits;
858 int s_desc_per_block_bits;
859 int s_inode_size;
860 int s_first_ino;
861 unsigned int s_inode_readahead_blks;
Andreas Dilger11013912009-06-13 11:45:35 -0400862 unsigned int s_inode_goal;
Theodore Ts'oca0faba2009-05-03 16:33:44 -0400863 spinlock_t s_next_gen_lock;
864 u32 s_next_generation;
865 u32 s_hash_seed[4];
866 int s_def_hash_version;
867 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
868 struct percpu_counter s_freeblocks_counter;
869 struct percpu_counter s_freeinodes_counter;
870 struct percpu_counter s_dirs_counter;
871 struct percpu_counter s_dirtyblocks_counter;
872 struct blockgroup_lock *s_blockgroup_lock;
873 struct proc_dir_entry *s_proc;
874 struct kobject s_kobj;
875 struct completion s_kobj_unregister;
876
877 /* Journaling */
878 struct inode *s_journal_inode;
879 struct journal_s *s_journal;
880 struct list_head s_orphan;
881 struct mutex s_orphan_lock;
882 struct mutex s_resize_lock;
883 unsigned long s_commit_interval;
884 u32 s_max_batch_time;
885 u32 s_min_batch_time;
886 struct block_device *journal_bdev;
887#ifdef CONFIG_JBD2_DEBUG
888 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
889 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
890#endif
891#ifdef CONFIG_QUOTA
892 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
893 int s_jquota_fmt; /* Format of quota to use */
894#endif
895 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400896 struct rb_root system_blks;
Theodore Ts'oca0faba2009-05-03 16:33:44 -0400897
898#ifdef EXTENTS_STATS
899 /* ext4 extents stats */
900 unsigned long s_ext_min;
901 unsigned long s_ext_max;
902 unsigned long s_depth_max;
903 spinlock_t s_ext_stats_lock;
904 unsigned long s_ext_blocks;
905 unsigned long s_ext_extents;
906#endif
907
908 /* for buddy allocator */
909 struct ext4_group_info ***s_group_info;
910 struct inode *s_buddy_cache;
911 long s_blocks_reserved;
912 spinlock_t s_reserve_lock;
913 spinlock_t s_md_lock;
914 tid_t s_last_transaction;
915 unsigned short *s_mb_offsets;
916 unsigned int *s_mb_maxs;
917
918 /* tunables */
919 unsigned long s_stripe;
920 unsigned int s_mb_stream_request;
921 unsigned int s_mb_max_to_scan;
922 unsigned int s_mb_min_to_scan;
923 unsigned int s_mb_stats;
924 unsigned int s_mb_order2_reqs;
925 unsigned int s_mb_group_prealloc;
926 /* where last allocation was done - for stream allocation */
927 unsigned long s_mb_last_group;
928 unsigned long s_mb_last_start;
929
930 /* history to debug policy */
931 struct ext4_mb_history *s_mb_history;
932 int s_mb_history_cur;
933 int s_mb_history_max;
934 int s_mb_history_num;
935 spinlock_t s_mb_history_lock;
936 int s_mb_history_filter;
937
938 /* stats for buddy allocator */
939 spinlock_t s_mb_pa_lock;
940 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
941 atomic_t s_bal_success; /* we found long enough chunks */
942 atomic_t s_bal_allocated; /* in blocks */
943 atomic_t s_bal_ex_scanned; /* total extents scanned */
944 atomic_t s_bal_goals; /* goal hits */
945 atomic_t s_bal_breaks; /* too long searches */
946 atomic_t s_bal_2orders; /* 2^order hits */
947 spinlock_t s_bal_lock;
948 unsigned long s_mb_buddies_generated;
949 unsigned long long s_mb_generation_time;
950 atomic_t s_mb_lost_chunks;
951 atomic_t s_mb_preallocated;
952 atomic_t s_mb_discarded;
953
954 /* locality groups */
955 struct ext4_locality_group *s_locality_groups;
956
957 /* for write statistics */
958 unsigned long s_sectors_written_start;
959 u64 s_kbytes_written;
960
961 unsigned int s_log_groups_per_flex;
962 struct flex_groups *s_flex_groups;
963};
964
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400965static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700966{
967 return sb->s_fs_info;
968}
Mingming Cao617ba132006-10-11 01:20:53 -0700969static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700970{
Mingming Cao617ba132006-10-11 01:20:53 -0700971 return container_of(inode, struct ext4_inode_info, vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700972}
973
Kalpak Shahef7f3832007-07-18 09:15:20 -0400974static inline struct timespec ext4_current_time(struct inode *inode)
975{
976 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
977 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
978}
979
Mingming Cao617ba132006-10-11 01:20:53 -0700980static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700981{
Mingming Cao617ba132006-10-11 01:20:53 -0700982 return ino == EXT4_ROOT_INO ||
983 ino == EXT4_JOURNAL_INO ||
984 ino == EXT4_RESIZE_INO ||
985 (ino >= EXT4_FIRST_INO(sb) &&
986 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700987}
988#else
Mingming Cao617ba132006-10-11 01:20:53 -0700989/* Assume that user mode programs are passing in an ext4fs superblock, not
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700990 * a kernel struct super_block. This will allow us to call the feature-test
991 * macros from user land. */
Mingming Cao617ba132006-10-11 01:20:53 -0700992#define EXT4_SB(sb) (sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700993#endif
994
Mingming Cao617ba132006-10-11 01:20:53 -0700995#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700996
997/*
998 * Codes for operating systems
999 */
Mingming Cao617ba132006-10-11 01:20:53 -07001000#define EXT4_OS_LINUX 0
1001#define EXT4_OS_HURD 1
1002#define EXT4_OS_MASIX 2
1003#define EXT4_OS_FREEBSD 3
1004#define EXT4_OS_LITES 4
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001005
1006/*
1007 * Revision levels
1008 */
Mingming Cao617ba132006-10-11 01:20:53 -07001009#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1010#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001011
Mingming Cao617ba132006-10-11 01:20:53 -07001012#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1013#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001014
Mingming Cao617ba132006-10-11 01:20:53 -07001015#define EXT4_GOOD_OLD_INODE_SIZE 128
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001016
1017/*
1018 * Feature set definitions
1019 */
1020
Mingming Cao617ba132006-10-11 01:20:53 -07001021#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001022 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001023#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001024 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001025#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001026 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001027#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1028 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1029#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1030 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1031#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1032 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1033#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1034 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1035#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1036 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1037#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1038 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001039
Mingming Cao617ba132006-10-11 01:20:53 -07001040#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1041#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1042#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1043#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1044#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1045#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001046
Mingming Cao617ba132006-10-11 01:20:53 -07001047#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1048#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1049#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001050#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
Andreas Dilger717d50e2007-10-16 18:38:25 -04001051#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001052#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
Kalpak Shahef7f3832007-07-18 09:15:20 -04001053#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001054
Mingming Cao617ba132006-10-11 01:20:53 -07001055#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1056#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1057#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1058#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1059#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
Alex Tomasa86c6182006-10-11 01:21:03 -07001060#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001061#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001062#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
Jose R. Santosce421582007-10-16 18:38:25 -04001063#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001064
Mingming Cao617ba132006-10-11 01:20:53 -07001065#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1066#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1067 EXT4_FEATURE_INCOMPAT_RECOVER| \
Alex Tomasa86c6182006-10-11 01:21:03 -07001068 EXT4_FEATURE_INCOMPAT_META_BG| \
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001069 EXT4_FEATURE_INCOMPAT_EXTENTS| \
Jose R. Santosce421582007-10-16 18:38:25 -04001070 EXT4_FEATURE_INCOMPAT_64BIT| \
1071 EXT4_FEATURE_INCOMPAT_FLEX_BG)
Mingming Cao617ba132006-10-11 01:20:53 -07001072#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1073 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
Andreas Dilger717d50e2007-10-16 18:38:25 -04001074 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001075 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
Kalpak Shahef7f3832007-07-18 09:15:20 -04001076 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001077 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1078 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001079
1080/*
1081 * Default values for user and/or group using reserved blocks
1082 */
Mingming Cao617ba132006-10-11 01:20:53 -07001083#define EXT4_DEF_RESUID 0
1084#define EXT4_DEF_RESGID 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001085
Theodore Ts'o240799c2008-10-09 23:53:47 -04001086#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1087
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001088/*
1089 * Default mount options
1090 */
Mingming Cao617ba132006-10-11 01:20:53 -07001091#define EXT4_DEFM_DEBUG 0x0001
1092#define EXT4_DEFM_BSDGROUPS 0x0002
1093#define EXT4_DEFM_XATTR_USER 0x0004
1094#define EXT4_DEFM_ACL 0x0008
1095#define EXT4_DEFM_UID16 0x0010
1096#define EXT4_DEFM_JMODE 0x0060
1097#define EXT4_DEFM_JMODE_DATA 0x0020
1098#define EXT4_DEFM_JMODE_ORDERED 0x0040
1099#define EXT4_DEFM_JMODE_WBACK 0x0060
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001100
1101/*
Theodore Ts'o30773842009-01-03 20:27:38 -05001102 * Default journal batch times
1103 */
1104#define EXT4_DEF_MIN_BATCH_TIME 0
1105#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1106
1107/*
Theodore Ts'oa4912122009-03-12 12:18:34 -04001108 * Minimum number of groups in a flexgroup before we separate out
1109 * directories into the first block group of a flexgroup
1110 */
1111#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1112
1113/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001114 * Structure of a directory entry
1115 */
Mingming Cao617ba132006-10-11 01:20:53 -07001116#define EXT4_NAME_LEN 255
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001117
Mingming Cao617ba132006-10-11 01:20:53 -07001118struct ext4_dir_entry {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001119 __le32 inode; /* Inode number */
1120 __le16 rec_len; /* Directory entry length */
1121 __le16 name_len; /* Name length */
Mingming Cao617ba132006-10-11 01:20:53 -07001122 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001123};
1124
1125/*
Mingming Cao617ba132006-10-11 01:20:53 -07001126 * The new version of the directory entry. Since EXT4 structures are
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001127 * stored in intel byte order, and the name_len field could never be
1128 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1129 * file_type field.
1130 */
Mingming Cao617ba132006-10-11 01:20:53 -07001131struct ext4_dir_entry_2 {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001132 __le32 inode; /* Inode number */
1133 __le16 rec_len; /* Directory entry length */
1134 __u8 name_len; /* Name length */
1135 __u8 file_type;
Mingming Cao617ba132006-10-11 01:20:53 -07001136 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001137};
1138
1139/*
Mingming Cao617ba132006-10-11 01:20:53 -07001140 * Ext4 directory file types. Only the low 3 bits are used. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001141 * other bits are reserved for now.
1142 */
Mingming Cao617ba132006-10-11 01:20:53 -07001143#define EXT4_FT_UNKNOWN 0
1144#define EXT4_FT_REG_FILE 1
1145#define EXT4_FT_DIR 2
1146#define EXT4_FT_CHRDEV 3
1147#define EXT4_FT_BLKDEV 4
1148#define EXT4_FT_FIFO 5
1149#define EXT4_FT_SOCK 6
1150#define EXT4_FT_SYMLINK 7
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001151
Mingming Cao617ba132006-10-11 01:20:53 -07001152#define EXT4_FT_MAX 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001153
1154/*
Mingming Cao617ba132006-10-11 01:20:53 -07001155 * EXT4_DIR_PAD defines the directory entries boundaries
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001156 *
1157 * NOTE: It must be a multiple of 4
1158 */
Mingming Cao617ba132006-10-11 01:20:53 -07001159#define EXT4_DIR_PAD 4
1160#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1161#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1162 ~EXT4_DIR_ROUND)
Jan Karaa72d7f82008-01-28 23:58:27 -05001163#define EXT4_MAX_REC_LEN ((1<<16)-1)
1164
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001165/*
1166 * Hash Tree Directory indexing
1167 * (c) Daniel Phillips, 2001
1168 */
1169
Eric Sandeen4074fe32007-10-16 18:38:25 -04001170#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1171 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
Mingming Cao617ba132006-10-11 01:20:53 -07001172 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
1173#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1174#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001175
1176/* Legal values for the dx_root hash_version field: */
1177
1178#define DX_HASH_LEGACY 0
1179#define DX_HASH_HALF_MD4 1
1180#define DX_HASH_TEA 2
Theodore Ts'of99b2582008-10-28 13:21:44 -04001181#define DX_HASH_LEGACY_UNSIGNED 3
1182#define DX_HASH_HALF_MD4_UNSIGNED 4
1183#define DX_HASH_TEA_UNSIGNED 5
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001184
1185#ifdef __KERNEL__
1186
1187/* hash info structure used by the directory hash */
1188struct dx_hash_info
1189{
1190 u32 hash;
1191 u32 minor_hash;
1192 int hash_version;
1193 u32 *seed;
1194};
1195
Mingming Cao617ba132006-10-11 01:20:53 -07001196#define EXT4_HTREE_EOF 0x7fffffff
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001197
1198/*
Mingming Cao617ba132006-10-11 01:20:53 -07001199 * Control parameters used by ext4_htree_next_block
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001200 */
1201#define HASH_NB_ALWAYS 1
1202
1203
1204/*
1205 * Describe an inode's exact location on disk and in memory
1206 */
Mingming Cao617ba132006-10-11 01:20:53 -07001207struct ext4_iloc
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001208{
1209 struct buffer_head *bh;
1210 unsigned long offset;
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001211 ext4_group_t block_group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001212};
1213
Mingming Cao617ba132006-10-11 01:20:53 -07001214static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001215{
Mingming Cao617ba132006-10-11 01:20:53 -07001216 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001217}
1218
1219/*
1220 * This structure is stuffed into the struct file's private_data field
1221 * for directories. It is where we put information so that we can do
1222 * readdir operations in hash tree order.
1223 */
1224struct dir_private_info {
1225 struct rb_root root;
1226 struct rb_node *curr_node;
1227 struct fname *extra_fname;
1228 loff_t last_pos;
1229 __u32 curr_hash;
1230 __u32 curr_minor_hash;
1231 __u32 next_hash;
1232};
1233
1234/* calculate the first block number of the group */
Mingming Cao617ba132006-10-11 01:20:53 -07001235static inline ext4_fsblk_t
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001236ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001237{
Mingming Cao617ba132006-10-11 01:20:53 -07001238 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1239 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001240}
1241
1242/*
1243 * Special error return code only used by dx_probe() and its callers.
1244 */
1245#define ERR_BAD_DX_DIR -75000
1246
Andrew Morton72b64b52006-10-11 01:21:18 -07001247void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05001248 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001249
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04001250extern struct proc_dir_entry *ext4_proc_root;
1251
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001252/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001253 * Function prototypes
1254 */
1255
1256/*
1257 * Ok, these declarations are also in <linux/kernel.h> but none of the
Mingming Cao617ba132006-10-11 01:20:53 -07001258 * ext4 source programs needs to include it so they are duplicated here.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001259 */
Dave Kleikamp8c55e202007-05-24 13:04:54 -04001260# define NORET_TYPE /**/
1261# define ATTRIB_NORET __attribute__((noreturn))
1262# define NORET_AND noreturn,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001263
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001264/* bitmap.c */
1265extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1266
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001267/* balloc.c */
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001268extern unsigned int ext4_block_group(struct super_block *sb,
1269 ext4_fsblk_t blocknr);
1270extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1271 ext4_fsblk_t blocknr);
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001272extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1273extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1274 ext4_group_t group);
Aneesh Kumar K.V7061eba2008-07-11 19:27:31 -04001275extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
Mingming Cao617ba132006-10-11 01:20:53 -07001276 ext4_fsblk_t goal, unsigned long *count, int *errp);
Aneesh Kumar K.V5c791612008-10-08 23:12:24 -04001277extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
Eric Sandeen8c3bf8a02008-10-28 00:08:12 -04001278extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001279extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
Alex Tomasc9de5602008-01-29 00:19:52 -05001280 ext4_fsblk_t block, unsigned long count, int metadata);
Aneesh Kumar K.Ve21675d2009-01-05 21:36:02 -05001281extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1282 ext4_fsblk_t block, unsigned long count);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001283extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1284extern void ext4_check_blocks_bitmap(struct super_block *);
Mingming Cao617ba132006-10-11 01:20:53 -07001285extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001286 ext4_group_t block_group,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001287 struct buffer_head ** bh);
Mingming Cao617ba132006-10-11 01:20:53 -07001288extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
Theodore Ts'obb23c202009-05-01 19:44:44 -04001289struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1290 ext4_group_t block_group);
1291extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1292 struct buffer_head *bh,
1293 ext4_group_t group,
1294 struct ext4_group_desc *desc);
1295#define ext4_free_blocks_after_init(sb, group, desc) \
1296 ext4_init_block_bitmap(sb, NULL, group, desc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001297
1298/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001299extern int ext4_check_dir_entry(const char *, struct inode *,
1300 struct ext4_dir_entry_2 *,
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001301 struct buffer_head *, unsigned int);
Mingming Cao617ba132006-10-11 01:20:53 -07001302extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001303 __u32 minor_hash,
Mingming Cao617ba132006-10-11 01:20:53 -07001304 struct ext4_dir_entry_2 *dirent);
1305extern void ext4_htree_free_dir_info(struct dir_private_info *p);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001306
1307/* fsync.c */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001308extern int ext4_sync_file(struct file *, struct dentry *, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001309
1310/* hash.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001311extern int ext4fs_dirhash(const char *name, int len, struct
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001312 dx_hash_info *hinfo);
1313
1314/* ialloc.c */
Theodore Ts'of157a4a2009-06-13 11:09:42 -04001315extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
Andreas Dilger11013912009-06-13 11:45:35 -04001316 const struct qstr *qstr, __u32 goal);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001317extern void ext4_free_inode(handle_t *, struct inode *);
1318extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1319extern unsigned long ext4_count_free_inodes(struct super_block *);
1320extern unsigned long ext4_count_dirs(struct super_block *);
1321extern void ext4_check_inodes_bitmap(struct super_block *);
Theodore Ts'obb23c202009-05-01 19:44:44 -04001322extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
1323 struct buffer_head *bh,
1324 ext4_group_t group,
1325 struct ext4_group_desc *desc);
1326extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001327
Alex Tomasc9de5602008-01-29 00:19:52 -05001328/* mballoc.c */
1329extern long ext4_mb_stats;
1330extern long ext4_mb_max_to_scan;
1331extern int ext4_mb_init(struct super_block *, int);
1332extern int ext4_mb_release(struct super_block *);
1333extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1334 struct ext4_allocation_request *, int *);
1335extern int ext4_mb_reserve_blocks(struct super_block *, int);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04001336extern void ext4_discard_preallocations(struct inode *);
Alex Tomasc9de5602008-01-29 00:19:52 -05001337extern int __init init_ext4_mballoc(void);
1338extern void exit_ext4_mballoc(void);
1339extern void ext4_mb_free_blocks(handle_t *, struct inode *,
Theodore Ts'o0610b6e2009-06-15 03:45:05 -04001340 ext4_fsblk_t, unsigned long, int, unsigned long *);
Aneesh Kumar K.V920313a2009-01-05 21:36:19 -05001341extern int ext4_mb_add_groupinfo(struct super_block *sb,
Frederic Bohe5f21b0e2008-07-11 19:27:31 -04001342 ext4_group_t i, struct ext4_group_desc *desc);
1343extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1344 ext4_grpblk_t add);
Aneesh Kumar K.V920313a2009-01-05 21:36:19 -05001345extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1346extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1347 ext4_group_t, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001348/* inode.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001349int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1350 struct buffer_head *bh, ext4_fsblk_t blocknr);
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001351struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1352 ext4_lblk_t, int, int *);
1353struct buffer_head *ext4_bread(handle_t *, struct inode *,
1354 ext4_lblk_t, int, int *);
Eric Sandeen6873fa02008-10-07 00:46:36 -04001355int ext4_get_block(struct inode *inode, sector_t iblock,
1356 struct buffer_head *bh_result, int create);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001357
David Howells1d1fe1e2008-02-07 00:15:37 -08001358extern struct inode *ext4_iget(struct super_block *, unsigned long);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001359extern int ext4_write_inode(struct inode *, int);
1360extern int ext4_setattr(struct dentry *, struct iattr *);
Mingming Cao3e3398a2008-07-11 19:27:31 -04001361extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1362 struct kstat *stat);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001363extern void ext4_delete_inode(struct inode *);
1364extern int ext4_sync_inode(handle_t *, struct inode *);
Mingming Cao617ba132006-10-11 01:20:53 -07001365extern void ext4_dirty_inode(struct inode *);
1366extern int ext4_change_inode_journal_flag(struct inode *, int);
1367extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
Duane Griffin91ef4ca2008-07-11 19:27:31 -04001368extern int ext4_can_truncate(struct inode *inode);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001369extern void ext4_truncate(struct inode *);
Mingming Cao617ba132006-10-11 01:20:53 -07001370extern void ext4_set_inode_flags(struct inode *);
Jan Karaff9ddf72007-07-18 09:24:20 -04001371extern void ext4_get_inode_flags(struct ext4_inode_info *);
Theodore Ts'occd25062009-02-26 01:04:07 -05001372extern int ext4_alloc_da_blocks(struct inode *inode);
Mingming Cao617ba132006-10-11 01:20:53 -07001373extern void ext4_set_aops(struct inode *inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07001374extern int ext4_writepage_trans_blocks(struct inode *);
Mingming Caoa02908f2008-08-19 22:16:07 -04001375extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
Mingming Caof3bd1f32008-08-19 22:16:03 -04001376extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
Jan Karacf108bc2008-07-11 19:27:31 -04001377extern int ext4_block_truncate_page(handle_t *handle,
Alex Tomasa86c6182006-10-11 01:21:03 -07001378 struct address_space *mapping, loff_t from);
Nick Pigginc2ec1752009-03-31 15:23:21 -07001379extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
Mingming Cao60e58e02009-01-22 18:13:05 +01001380extern qsize_t ext4_get_reserved_space(struct inode *inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001381
1382/* ioctl.c */
Andi Kleen5cdd7b22008-04-29 22:03:54 -04001383extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001384extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001385
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -05001386/* migrate.c */
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -04001387extern int ext4_ext_migrate(struct inode *);
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001388
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001389/* namei.c */
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001390extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1391extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
Mingming Cao617ba132006-10-11 01:20:53 -07001392extern int ext4_orphan_add(handle_t *, struct inode *);
1393extern int ext4_orphan_del(handle_t *, struct inode *);
1394extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001395 __u32 start_minor_hash, __u32 *next_hash);
1396
1397/* resize.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001398extern int ext4_group_add(struct super_block *sb,
1399 struct ext4_new_group_data *input);
1400extern int ext4_group_extend(struct super_block *sb,
1401 struct ext4_super_block *es,
1402 ext4_fsblk_t n_blocks_count);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001403
1404/* super.c */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001405extern void ext4_error(struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001406 __attribute__ ((format (printf, 3, 4)));
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001407extern void __ext4_std_error(struct super_block *, const char *, int);
1408extern void ext4_abort(struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001409 __attribute__ ((format (printf, 3, 4)));
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001410extern void ext4_warning(struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001411 __attribute__ ((format (printf, 3, 4)));
Eric Sandeenb31e1552009-06-04 17:36:36 -04001412extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1413 __attribute__ ((format (printf, 3, 4)));
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001414extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1415 const char *, const char *, ...)
1416 __attribute__ ((format (printf, 4, 5)));
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001417extern void ext4_update_dynamic_rev(struct super_block *sb);
Aneesh Kumar K.V99e6f822008-01-28 23:58:27 -05001418extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1419 __u32 compat);
1420extern int ext4_update_rocompat_feature(handle_t *handle,
1421 struct super_block *sb, __u32 rocompat);
1422extern int ext4_update_incompat_feature(handle_t *handle,
1423 struct super_block *sb, __u32 incompat);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001424extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1425 struct ext4_group_desc *bg);
1426extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1427 struct ext4_group_desc *bg);
1428extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1429 struct ext4_group_desc *bg);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05001430extern __u32 ext4_free_blks_count(struct super_block *sb,
1431 struct ext4_group_desc *bg);
1432extern __u32 ext4_free_inodes_count(struct super_block *sb,
1433 struct ext4_group_desc *bg);
1434extern __u32 ext4_used_dirs_count(struct super_block *sb,
1435 struct ext4_group_desc *bg);
1436extern __u32 ext4_itable_unused_count(struct super_block *sb,
1437 struct ext4_group_desc *bg);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001438extern void ext4_block_bitmap_set(struct super_block *sb,
1439 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1440extern void ext4_inode_bitmap_set(struct super_block *sb,
1441 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1442extern void ext4_inode_table_set(struct super_block *sb,
1443 struct ext4_group_desc *bg, ext4_fsblk_t blk);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05001444extern void ext4_free_blks_set(struct super_block *sb,
1445 struct ext4_group_desc *bg, __u32 count);
1446extern void ext4_free_inodes_set(struct super_block *sb,
1447 struct ext4_group_desc *bg, __u32 count);
1448extern void ext4_used_dirs_set(struct super_block *sb,
1449 struct ext4_group_desc *bg, __u32 count);
1450extern void ext4_itable_unused_set(struct super_block *sb,
1451 struct ext4_group_desc *bg, __u32 count);
Theodore Ts'obb23c202009-05-01 19:44:44 -04001452extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1453 struct ext4_group_desc *gdp);
1454extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1455 struct ext4_group_desc *gdp);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001456
1457static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1458{
1459 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001460 le32_to_cpu(es->s_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001461}
1462
1463static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1464{
1465 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001466 le32_to_cpu(es->s_r_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001467}
1468
1469static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1470{
1471 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001472 le32_to_cpu(es->s_free_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001473}
1474
1475static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1476 ext4_fsblk_t blk)
1477{
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001478 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001479 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1480}
1481
1482static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1483 ext4_fsblk_t blk)
1484{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001485 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001486 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1487}
1488
1489static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1490 ext4_fsblk_t blk)
1491{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001492 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001493 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1494}
1495
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001496static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1497{
Theodore Ts'o06a279d2009-01-17 18:41:37 -05001498 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1499 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1500 le32_to_cpu(raw_inode->i_size_lo);
1501 else
1502 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001503}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001504
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001505static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1506{
1507 raw_inode->i_size_lo = cpu_to_le32(i_size);
1508 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1509}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001510
Alex Tomasc9de5602008-01-29 00:19:52 -05001511static inline
1512struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001513 ext4_group_t group)
Alex Tomasc9de5602008-01-29 00:19:52 -05001514{
1515 struct ext4_group_info ***grp_info;
1516 long indexv, indexh;
1517 grp_info = EXT4_SB(sb)->s_group_info;
1518 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1519 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1520 return grp_info[indexv][indexh];
1521}
1522
Theodore Ts'o8df96752009-05-01 08:50:38 -04001523/*
1524 * Reading s_groups_count requires using smp_rmb() afterwards. See
1525 * the locking protocol documented in the comments of ext4_group_add()
1526 * in resize.c
1527 */
1528static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1529{
1530 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
1531
1532 smp_rmb();
1533 return ngroups;
1534}
Alex Tomasc9de5602008-01-29 00:19:52 -05001535
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001536static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1537 ext4_group_t block_group)
1538{
1539 return block_group >> sbi->s_log_groups_per_flex;
1540}
1541
1542static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1543{
1544 return 1 << sbi->s_log_groups_per_flex;
1545}
1546
Mingming Cao617ba132006-10-11 01:20:53 -07001547#define ext4_std_error(sb, errno) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001548do { \
1549 if ((errno)) \
Stoyan Gaydarov4db9c542008-07-13 21:03:29 -04001550 __ext4_std_error((sb), __func__, (errno)); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001551} while (0)
1552
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04001553#ifdef CONFIG_SMP
Eric Dumazet179f7eb2009-01-06 14:41:04 -08001554/* Each CPU can accumulate percpu_counter_batch blocks in their local
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04001555 * counters. So we need to make sure we have free blocks more
Eric Dumazet179f7eb2009-01-06 14:41:04 -08001556 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04001557 */
Eric Dumazet179f7eb2009-01-06 14:41:04 -08001558#define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04001559#else
1560#define EXT4_FREEBLOCKS_WATERMARK 0
1561#endif
1562
Aneesh Kumar K.Vcf17fea2008-09-13 13:06:18 -04001563static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1564{
1565 /*
1566 * XXX: replace with spinlock if seen contended -bzzz
1567 */
1568 down_write(&EXT4_I(inode)->i_data_sem);
1569 if (newsize > EXT4_I(inode)->i_disksize)
1570 EXT4_I(inode)->i_disksize = newsize;
1571 up_write(&EXT4_I(inode)->i_data_sem);
1572 return ;
1573}
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04001574
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001575struct ext4_group_info {
1576 unsigned long bb_state;
1577 struct rb_root bb_free_root;
1578 unsigned short bb_first_free;
1579 unsigned short bb_free;
1580 unsigned short bb_fragments;
1581 struct list_head bb_prealloc_list;
1582#ifdef DOUBLE_CHECK
1583 void *bb_bitmap;
1584#endif
1585 struct rw_semaphore alloc_sem;
1586 unsigned short bb_counters[];
1587};
1588
1589#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001590
1591#define EXT4_MB_GRP_NEED_INIT(grp) \
1592 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1593
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04001594static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1595 ext4_group_t group)
1596{
1597 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1598}
1599
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001600static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1601{
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04001602 spin_lock(ext4_group_lock_ptr(sb, group));
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001603}
1604
1605static inline void ext4_unlock_group(struct super_block *sb,
1606 ext4_group_t group)
1607{
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04001608 spin_unlock(ext4_group_lock_ptr(sb, group));
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001609}
1610
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001611/*
1612 * Inodes and files operations
1613 */
1614
1615/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001616extern const struct file_operations ext4_dir_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001617
1618/* file.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001619extern const struct inode_operations ext4_file_inode_operations;
Mingming Cao617ba132006-10-11 01:20:53 -07001620extern const struct file_operations ext4_file_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001621
1622/* namei.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001623extern const struct inode_operations ext4_dir_inode_operations;
1624extern const struct inode_operations ext4_special_inode_operations;
Theodore Ts'o596397b2009-05-01 13:49:15 -04001625extern struct dentry *ext4_get_parent(struct dentry *child);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001626
1627/* symlink.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001628extern const struct inode_operations ext4_symlink_inode_operations;
1629extern const struct inode_operations ext4_fast_symlink_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001630
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04001631/* block_validity */
1632extern void ext4_release_system_zone(struct super_block *sb);
1633extern int ext4_setup_system_zone(struct super_block *sb);
1634extern int __init init_ext4_system_zone(void);
1635extern void exit_ext4_system_zone(void);
1636extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
1637 ext4_fsblk_t start_blk,
1638 unsigned int count);
1639
Alex Tomasa86c6182006-10-11 01:21:03 -07001640/* extents.c */
1641extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1642extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
Mingming Caoa02908f2008-08-19 22:16:07 -04001643extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1644 int chunk);
Alex Tomasa86c6182006-10-11 01:21:03 -07001645extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001646 ext4_lblk_t iblock, unsigned int max_blocks,
Theodore Ts'oc2177052009-05-14 00:58:52 -04001647 struct buffer_head *bh_result, int flags);
Jan Karacf108bc2008-07-11 19:27:31 -04001648extern void ext4_ext_truncate(struct inode *);
Alex Tomasa86c6182006-10-11 01:21:03 -07001649extern void ext4_ext_init(struct super_block *);
1650extern void ext4_ext_release(struct super_block *);
Amit Aroraa2df2a62007-07-17 21:42:41 -04001651extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1652 loff_t len);
Theodore Ts'o12b7ac12009-05-14 00:57:44 -04001653extern int ext4_get_blocks(handle_t *handle, struct inode *inode,
1654 sector_t block, unsigned int max_blocks,
Theodore Ts'oc2177052009-05-14 00:58:52 -04001655 struct buffer_head *bh, int flags);
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001656extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1657 __u64 start, __u64 len);
Akira Fujita748de672009-06-17 19:24:03 -04001658/* move_extent.c */
1659extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
1660 __u64 start_orig, __u64 start_donor,
1661 __u64 len, __u64 *moved_len);
1662
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001663
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -05001664/*
1665 * Add new method to test wether block and inode bitmaps are properly
1666 * initialized. With uninit_bg reading the block from disk is not enough
1667 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1668 */
1669#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1670
1671static inline int bitmap_uptodate(struct buffer_head *bh)
1672{
1673 return (buffer_uptodate(bh) &&
1674 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1675}
1676static inline void set_bitmap_uptodate(struct buffer_head *bh)
1677{
1678 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1679}
1680
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001681#endif /* __KERNEL__ */
1682
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04001683#endif /* _EXT4_H */