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Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04002 * ext4.h
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/include/linux/minix_fs.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040016#ifndef _EXT4_H
17#define _EXT4_H
Dave Kleikampac27a0e2006-10-11 01:20:50 -070018
19#include <linux/types.h>
Mingming Cao3a5b2ec2006-10-11 01:21:05 -070020#include <linux/blkdev.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070021#include <linux/magic.h>
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
Theodore Ts'o296c3552009-09-30 00:32:42 -040068/*
69 * Flags used in mballoc's allocation_context flags field.
70 *
71 * Also used to show what's going on for debugging purposes when the
72 * flag field is exported via the traceport interface
73 */
Theodore Ts'od444c3c2009-05-01 13:44:33 -040074
Alex Tomasc9de5602008-01-29 00:19:52 -050075/* prefer goal again. length */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040076#define EXT4_MB_HINT_MERGE 0x0001
Alex Tomasc9de5602008-01-29 00:19:52 -050077/* blocks already reserved */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040078#define EXT4_MB_HINT_RESERVED 0x0002
Alex Tomasc9de5602008-01-29 00:19:52 -050079/* metadata is being allocated */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040080#define EXT4_MB_HINT_METADATA 0x0004
Alex Tomasc9de5602008-01-29 00:19:52 -050081/* first blocks in the file */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040082#define EXT4_MB_HINT_FIRST 0x0008
Alex Tomasc9de5602008-01-29 00:19:52 -050083/* search for the best chunk */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040084#define EXT4_MB_HINT_BEST 0x0010
Alex Tomasc9de5602008-01-29 00:19:52 -050085/* data is being allocated */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040086#define EXT4_MB_HINT_DATA 0x0020
Alex Tomasc9de5602008-01-29 00:19:52 -050087/* don't preallocate (for tails) */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040088#define EXT4_MB_HINT_NOPREALLOC 0x0040
Alex Tomasc9de5602008-01-29 00:19:52 -050089/* allocate for locality group */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040090#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
Alex Tomasc9de5602008-01-29 00:19:52 -050091/* allocate goal blocks or none */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040092#define EXT4_MB_HINT_GOAL_ONLY 0x0100
Alex Tomasc9de5602008-01-29 00:19:52 -050093/* goal is meaningful */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040094#define EXT4_MB_HINT_TRY_GOAL 0x0200
Mingming Caod2a17632008-07-14 17:52:37 -040095/* blocks already pre-reserved by delayed allocation */
Theodore Ts'o0ef90db2009-08-09 16:46:13 -040096#define EXT4_MB_DELALLOC_RESERVED 0x0400
Theodore Ts'o4ba74d02009-08-09 22:01:13 -040097/* We are doing stream allocation */
98#define EXT4_MB_STREAM_ALLOC 0x0800
Mingming Caod2a17632008-07-14 17:52:37 -040099
Alex Tomasc9de5602008-01-29 00:19:52 -0500100
101struct ext4_allocation_request {
102 /* target inode for block we're allocating */
103 struct inode *inode;
Alex Tomasc9de5602008-01-29 00:19:52 -0500104 /* how many blocks we want to allocate */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500105 unsigned int len;
Eric Sandeen726447d2009-07-13 10:24:17 -0400106 /* logical block in target inode */
107 ext4_lblk_t logical;
108 /* the closest logical allocated block to the left */
109 ext4_lblk_t lleft;
110 /* the closest logical allocated block to the right */
111 ext4_lblk_t lright;
112 /* phys. target (a hint) */
113 ext4_fsblk_t goal;
114 /* phys. block for the closest logical allocated block to the left */
115 ext4_fsblk_t pleft;
116 /* phys. block for the closest logical allocated block to the right */
117 ext4_fsblk_t pright;
Alex Tomasc9de5602008-01-29 00:19:52 -0500118 /* flags. see above EXT4_MB_HINT_* */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500119 unsigned int flags;
Alex Tomasc9de5602008-01-29 00:19:52 -0500120};
121
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700122/*
Theodore Ts'ob3a3ca82009-08-31 23:13:11 -0400123 * For delayed allocation tracking
124 */
125struct mpage_da_data {
126 struct inode *inode;
127 sector_t b_blocknr; /* start block number of extent */
128 size_t b_size; /* size of extent */
129 unsigned long b_state; /* state of the extent */
130 unsigned long first_page, next_page; /* extent of pages */
131 struct writeback_control *wbc;
132 int io_done;
133 int pages_written;
134 int retval;
135};
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400136#define DIO_AIO_UNWRITTEN 0x1
Mingming Cao00314622009-09-28 15:49:08 -0400137typedef struct ext4_io_end {
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400138 struct list_head list; /* per-file finished AIO list */
Mingming Cao00314622009-09-28 15:49:08 -0400139 struct inode *inode; /* file being written to */
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400140 unsigned int flag; /* unwritten or not */
Mingming Cao00314622009-09-28 15:49:08 -0400141 int error; /* I/O error code */
Eric Sandeena1de02d2010-02-04 23:58:38 -0500142 loff_t offset; /* offset in the file */
143 ssize_t size; /* size of the extent */
Mingming Cao00314622009-09-28 15:49:08 -0400144 struct work_struct work; /* data work queue */
145} ext4_io_end_t;
146
Theodore Ts'ob3a3ca82009-08-31 23:13:11 -0400147/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700148 * Special inodes numbers
149 */
Mingming Cao617ba132006-10-11 01:20:53 -0700150#define EXT4_BAD_INO 1 /* Bad blocks inode */
151#define EXT4_ROOT_INO 2 /* Root inode */
152#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
153#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
154#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
155#define EXT4_JOURNAL_INO 8 /* Journal inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700156
Mingming Cao617ba132006-10-11 01:20:53 -0700157/* First non-reserved inode for old ext4 filesystems */
158#define EXT4_GOOD_OLD_FIRST_INO 11
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700159
160/*
161 * Maximal count of links to a file
162 */
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400163#define EXT4_LINK_MAX 65000
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700164
165/*
166 * Macro-instructions used to manage several block sizes
167 */
Mingming Cao617ba132006-10-11 01:20:53 -0700168#define EXT4_MIN_BLOCK_SIZE 1024
Takashi Satoafc7cbc2008-01-28 23:58:27 -0500169#define EXT4_MAX_BLOCK_SIZE 65536
170#define EXT4_MIN_BLOCK_LOG_SIZE 10
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700171#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700172# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700173#else
Mingming Cao617ba132006-10-11 01:20:53 -0700174# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700175#endif
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400176#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700177#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700178# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700179#else
Mingming Cao617ba132006-10-11 01:20:53 -0700180# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700181#endif
182#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700183#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
184#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
185#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700186#else
Mingming Cao617ba132006-10-11 01:20:53 -0700187#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
188 EXT4_GOOD_OLD_INODE_SIZE : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700189 (s)->s_inode_size)
Mingming Cao617ba132006-10-11 01:20:53 -0700190#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
191 EXT4_GOOD_OLD_FIRST_INO : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700192 (s)->s_first_ino)
193#endif
Amit Aroraa2df2a62007-07-17 21:42:41 -0400194#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700195
196/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700197 * Structure of a blocks group descriptor
198 */
Mingming Cao617ba132006-10-11 01:20:53 -0700199struct ext4_group_desc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700200{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400201 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400202 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
203 __le32 bg_inode_table_lo; /* Inodes table block */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500204 __le16 bg_free_blocks_count_lo;/* Free blocks count */
205 __le16 bg_free_inodes_count_lo;/* Free inodes count */
206 __le16 bg_used_dirs_count_lo; /* Directories count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400207 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
208 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500209 __le16 bg_itable_unused_lo; /* Unused inodes count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400210 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700211 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
212 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
213 __le32 bg_inode_table_hi; /* Inodes table block MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500214 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
215 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
216 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500217 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500218 __u32 bg_reserved2[3];
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700219};
220
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400221/*
222 * Structure of a flex block group info
223 */
224
225struct flex_groups {
Theodore Ts'o9f24e422009-03-04 19:09:10 -0500226 atomic_t free_inodes;
227 atomic_t free_blocks;
Theodore Ts'o7d39db12009-03-04 19:31:53 -0500228 atomic_t used_dirs;
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400229};
230
Andreas Dilger717d50e2007-10-16 18:38:25 -0400231#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
232#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
233#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
234
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700235/*
236 * Macro-instructions used to manage group descriptors
237 */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700238#define EXT4_MIN_DESC_SIZE 32
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700239#define EXT4_MIN_DESC_SIZE_64BIT 64
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700240#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
241#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700242#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700243# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
244# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
245# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
246# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700247#else
Mingming Cao617ba132006-10-11 01:20:53 -0700248# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700249# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
Mingming Cao617ba132006-10-11 01:20:53 -0700250# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700251#endif
252
253/*
254 * Constants relative to the data blocks
255 */
Mingming Cao617ba132006-10-11 01:20:53 -0700256#define EXT4_NDIR_BLOCKS 12
257#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
258#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
259#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
260#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700261
262/*
263 * Inode flags
264 */
Mingming Cao617ba132006-10-11 01:20:53 -0700265#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
266#define EXT4_UNRM_FL 0x00000002 /* Undelete */
267#define EXT4_COMPR_FL 0x00000004 /* Compress file */
268#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
269#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
270#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
271#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
272#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700273/* Reserved for compression usage... */
Mingming Cao617ba132006-10-11 01:20:53 -0700274#define EXT4_DIRTY_FL 0x00000100
275#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
276#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
277#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700278/* End compression flags --- maybe not all used */
Mingming Cao617ba132006-10-11 01:20:53 -0700279#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
280#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
281#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
282#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
283#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
284#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500285#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
Alex Tomasa86c6182006-10-11 01:21:03 -0700286#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
Theodore Ts'of710b4b2010-01-25 03:31:32 -0500287#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500288#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700289
Alex Tomasa86c6182006-10-11 01:21:03 -0700290#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
Aneesh Kumar K.V4db46fc2008-10-08 23:34:06 -0400291#define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700292
Duane Griffin8fa43a82009-02-15 18:57:26 -0500293/* Flags that should be inherited by new inodes from their parent. */
294#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
295 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
296 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
297 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
298 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
299
Duane Griffin2dc6b0d2009-02-15 18:09:20 -0500300/* Flags that are appropriate for regular files (all but dir-specific ones). */
301#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
302
303/* Flags that are appropriate for non-directories/regular files. */
304#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
305
306/* Mask out flags that are inappropriate for the given type of inode. */
307static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
308{
309 if (S_ISDIR(mode))
310 return flags;
311 else if (S_ISREG(mode))
312 return flags & EXT4_REG_FLMASK;
313 else
314 return flags & EXT4_OTHER_FLMASK;
315}
316
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700317/* Used to pass group descriptor data when online resize is done */
Mingming Cao617ba132006-10-11 01:20:53 -0700318struct ext4_new_group_input {
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400319 __u32 group; /* Group number for this data */
320 __u64 block_bitmap; /* Absolute block number of block bitmap */
321 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
322 __u64 inode_table; /* Absolute block number of inode table start */
323 __u32 blocks_count; /* Total number of blocks in this group */
324 __u16 reserved_blocks; /* Number of reserved blocks in this group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700325 __u16 unused;
326};
327
Mingming Cao617ba132006-10-11 01:20:53 -0700328/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
329struct ext4_new_group_data {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700330 __u32 group;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700331 __u64 block_bitmap;
332 __u64 inode_bitmap;
333 __u64 inode_table;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700334 __u32 blocks_count;
335 __u16 reserved_blocks;
336 __u16 unused;
337 __u32 free_blocks_count;
338};
339
Amit Aroraa2df2a62007-07-17 21:42:41 -0400340/*
Theodore Ts'oc2177052009-05-14 00:58:52 -0400341 * Flags used by ext4_get_blocks()
Amit Aroraa2df2a62007-07-17 21:42:41 -0400342 */
Theodore Ts'oc2177052009-05-14 00:58:52 -0400343 /* Allocate any needed blocks and/or convert an unitialized
344 extent to be an initialized ext4 */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400345#define EXT4_GET_BLOCKS_CREATE 0x0001
Theodore Ts'oc2177052009-05-14 00:58:52 -0400346 /* Request the creation of an unitialized extent */
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400347#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
Theodore Ts'oc2177052009-05-14 00:58:52 -0400348#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
349 EXT4_GET_BLOCKS_CREATE)
Theodore Ts'oc2177052009-05-14 00:58:52 -0400350 /* Caller is from the delayed allocation writeout path,
Theodore Ts'o2ac3b6e2009-05-14 13:57:08 -0400351 so set the magic i_delalloc_reserve_flag after taking the
352 inode allocation semaphore for */
Jan Kara03f5d8b2009-06-09 00:17:05 -0400353#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
Mingming Cao00314622009-09-28 15:49:08 -0400354 /* caller is from the direct IO path, request to creation of an
355 unitialized extents if not allocated, split the uninitialized
356 extent if blocks has been preallocated already*/
Aneesh Kumar K.V1296cc82010-01-15 01:27:59 -0500357#define EXT4_GET_BLOCKS_DIO 0x0008
358#define EXT4_GET_BLOCKS_CONVERT 0x0010
Mingming Cao00314622009-09-28 15:49:08 -0400359#define EXT4_GET_BLOCKS_DIO_CREATE_EXT (EXT4_GET_BLOCKS_DIO|\
360 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
361 /* Convert extent to initialized after direct IO complete */
362#define EXT4_GET_BLOCKS_DIO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
363 EXT4_GET_BLOCKS_DIO_CREATE_EXT)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700364
365/*
Theodore Ts'oe6362602009-11-23 07:17:05 -0500366 * Flags used by ext4_free_blocks
367 */
368#define EXT4_FREE_BLOCKS_METADATA 0x0001
369#define EXT4_FREE_BLOCKS_FORGET 0x0002
Theodore Ts'o1f2acb62010-01-22 17:40:42 -0500370#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
Theodore Ts'oe6362602009-11-23 07:17:05 -0500371
372/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700373 * ioctl commands
374 */
Mingming Cao617ba132006-10-11 01:20:53 -0700375#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
376#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
377#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
378#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
Mingming Cao617ba132006-10-11 01:20:53 -0700379#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
380#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
Jose R. Santose23291b2007-07-18 08:57:06 -0400381#ifdef CONFIG_JBD2_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700382#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700383#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700384#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
385#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400386#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
387#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
388#define EXT4_IOC_MIGRATE _IO('f', 9)
Theodore Ts'occd25062009-02-26 01:04:07 -0500389 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400390 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
Theodore Ts'occd25062009-02-26 01:04:07 -0500391#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
Akira Fujita748de672009-06-17 19:24:03 -0400392#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700393
394/*
395 * ioctl commands in 32 bit emulation
396 */
Mingming Cao617ba132006-10-11 01:20:53 -0700397#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
398#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
399#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
400#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
401#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
402#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
403#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
Jose R. Santose23291b2007-07-18 08:57:06 -0400404#ifdef CONFIG_JBD2_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700405#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700406#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700407#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
408#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700409
410
411/*
412 * Mount options
413 */
Mingming Cao617ba132006-10-11 01:20:53 -0700414struct ext4_mount_options {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700415 unsigned long s_mount_opt;
416 uid_t s_resuid;
417 gid_t s_resgid;
418 unsigned long s_commit_interval;
Theodore Ts'o30773842009-01-03 20:27:38 -0500419 u32 s_min_batch_time, s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700420#ifdef CONFIG_QUOTA
421 int s_jquota_fmt;
422 char *s_qf_names[MAXQUOTAS];
423#endif
424};
425
Eric Sandeenfb0a3872009-09-16 14:45:10 -0400426/* Max physical block we can addres w/o extents */
427#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
428
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700429/*
430 * Structure of an inode on the disk
431 */
Mingming Cao617ba132006-10-11 01:20:53 -0700432struct ext4_inode {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700433 __le16 i_mode; /* File mode */
434 __le16 i_uid; /* Low 16 bits of Owner Uid */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500435 __le32 i_size_lo; /* Size in bytes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700436 __le32 i_atime; /* Access time */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400437 __le32 i_ctime; /* Inode Change time */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700438 __le32 i_mtime; /* Modification time */
439 __le32 i_dtime; /* Deletion Time */
440 __le16 i_gid; /* Low 16 bits of Group Id */
441 __le16 i_links_count; /* Links count */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500442 __le32 i_blocks_lo; /* Blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700443 __le32 i_flags; /* File flags */
444 union {
445 struct {
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500446 __le32 l_i_version;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700447 } linux1;
448 struct {
449 __u32 h_i_translator;
450 } hurd1;
451 struct {
452 __u32 m_i_reserved1;
453 } masix1;
454 } osd1; /* OS dependent 1 */
Mingming Cao617ba132006-10-11 01:20:53 -0700455 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700456 __le32 i_generation; /* File version (for NFS) */
Aneesh Kumar K.V7973c0c2008-01-28 23:58:27 -0500457 __le32 i_file_acl_lo; /* File ACL */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500458 __le32 i_size_high;
Coly Lif077d0d2007-10-16 18:38:25 -0400459 __le32 i_obso_faddr; /* Obsoleted fragment address */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700460 union {
461 struct {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500462 __le16 l_i_blocks_high; /* were l_i_reserved1 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700463 __le16 l_i_file_acl_high;
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400464 __le16 l_i_uid_high; /* these 2 fields */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700465 __le16 l_i_gid_high; /* were reserved2[0] */
466 __u32 l_i_reserved2;
467 } linux2;
468 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400469 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700470 __u16 h_i_mode_high;
471 __u16 h_i_uid_high;
472 __u16 h_i_gid_high;
473 __u32 h_i_author;
474 } hurd2;
475 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400476 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700477 __le16 m_i_file_acl_high;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700478 __u32 m_i_reserved2[2];
479 } masix2;
480 } osd2; /* OS dependent 2 */
481 __le16 i_extra_isize;
482 __le16 i_pad1;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400483 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
484 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
485 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
486 __le32 i_crtime; /* File Creation time */
487 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500488 __le32 i_version_hi; /* high 32 bits for 64-bit version */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700489};
490
Akira Fujita748de672009-06-17 19:24:03 -0400491struct move_extent {
492 __u32 reserved; /* should be zero */
493 __u32 donor_fd; /* donor file descriptor */
494 __u64 orig_start; /* logical start offset in block for orig */
495 __u64 donor_start; /* logical start offset in block for donor */
496 __u64 len; /* block length to be moved */
497 __u64 moved_len; /* moved block length */
498};
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700499
Kalpak Shahef7f3832007-07-18 09:15:20 -0400500#define EXT4_EPOCH_BITS 2
501#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
502#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
503
504/*
505 * Extended fields will fit into an inode if the filesystem was formatted
506 * with large inodes (-I 256 or larger) and there are not currently any EAs
507 * consuming all of the available space. For new inodes we always reserve
508 * enough space for the kernel's known extended fields, but for inodes
509 * created with an old kernel this might not have been the case. None of
510 * the extended inode fields is critical for correct filesystem operation.
511 * This macro checks if a certain field fits in the inode. Note that
512 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
513 */
514#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
515 ((offsetof(typeof(*ext4_inode), field) + \
516 sizeof((ext4_inode)->field)) \
517 <= (EXT4_GOOD_OLD_INODE_SIZE + \
518 (einode)->i_extra_isize)) \
519
520static inline __le32 ext4_encode_extra_time(struct timespec *time)
521{
522 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
Theodore Ts'oc1fccc02009-09-30 01:13:55 -0400523 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
524 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
Kalpak Shahef7f3832007-07-18 09:15:20 -0400525}
526
527static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
528{
529 if (sizeof(time->tv_sec) > 4)
530 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
531 << 32;
Theodore Ts'oc1fccc02009-09-30 01:13:55 -0400532 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400533}
534
535#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
536do { \
537 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
538 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
539 (raw_inode)->xtime ## _extra = \
540 ext4_encode_extra_time(&(inode)->xtime); \
541} while (0)
542
543#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
544do { \
545 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
546 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
547 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
548 (raw_inode)->xtime ## _extra = \
549 ext4_encode_extra_time(&(einode)->xtime); \
550} while (0)
551
552#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
553do { \
554 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
555 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
556 ext4_decode_extra_time(&(inode)->xtime, \
557 raw_inode->xtime ## _extra); \
558} while (0)
559
560#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
561do { \
562 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
563 (einode)->xtime.tv_sec = \
564 (signed)le32_to_cpu((raw_inode)->xtime); \
565 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
566 ext4_decode_extra_time(&(einode)->xtime, \
567 raw_inode->xtime ## _extra); \
568} while (0)
569
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500570#define i_disk_version osd1.linux1.l_i_version
571
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700572#if defined(__KERNEL__) || defined(__linux__)
573#define i_reserved1 osd1.linux1.l_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700574#define i_file_acl_high osd2.linux2.l_i_file_acl_high
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500575#define i_blocks_high osd2.linux2.l_i_blocks_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700576#define i_uid_low i_uid
577#define i_gid_low i_gid
578#define i_uid_high osd2.linux2.l_i_uid_high
579#define i_gid_high osd2.linux2.l_i_gid_high
580#define i_reserved2 osd2.linux2.l_i_reserved2
581
582#elif defined(__GNU__)
583
584#define i_translator osd1.hurd1.h_i_translator
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700585#define i_uid_high osd2.hurd2.h_i_uid_high
586#define i_gid_high osd2.hurd2.h_i_gid_high
587#define i_author osd2.hurd2.h_i_author
588
589#elif defined(__masix__)
590
591#define i_reserved1 osd1.masix1.m_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700592#define i_file_acl_high osd2.masix2.m_i_file_acl_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700593#define i_reserved2 osd2.masix2.m_i_reserved2
594
595#endif /* defined(__KERNEL__) || defined(__linux__) */
596
597/*
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400598 * storage for cached extent
599 */
600struct ext4_ext_cache {
601 ext4_fsblk_t ec_start;
602 ext4_lblk_t ec_block;
603 __u32 ec_len; /* must be 32bit to return holes */
604 __u32 ec_type;
605};
606
607/*
608 * fourth extended file system inode data in memory
609 */
610struct ext4_inode_info {
611 __le32 i_data[15]; /* unconverted */
612 __u32 i_flags;
613 ext4_fsblk_t i_file_acl;
614 __u32 i_dtime;
615
616 /*
617 * i_block_group is the number of the block group which contains
618 * this file's inode. Constant across the lifetime of the inode,
619 * it is ued for making block allocation decisions - we try to
620 * place a file's data blocks near its inode block, and new inodes
621 * near to their parent directory's inode.
622 */
623 ext4_group_t i_block_group;
Theodore Ts'o19f5fb72010-01-24 14:34:07 -0500624 unsigned long i_state_flags; /* Dynamic state flags */
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400625
626 ext4_lblk_t i_dir_start_lookup;
627#ifdef CONFIG_EXT4_FS_XATTR
628 /*
629 * Extended attributes can be read independently of the main file
630 * data. Taking i_mutex even when reading would cause contention
631 * between readers of EAs and writers of regular file data, so
632 * instead we synchronize on xattr_sem when reading or changing
633 * EAs.
634 */
635 struct rw_semaphore xattr_sem;
636#endif
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400637
638 struct list_head i_orphan; /* unlinked but open inodes */
639
640 /*
641 * i_disksize keeps track of what the inode size is ON DISK, not
642 * in memory. During truncate, i_size is set to the new size by
643 * the VFS prior to calling ext4_truncate(), but the filesystem won't
644 * set i_disksize to 0 until the truncate is actually under way.
645 *
646 * The intent is that i_disksize always represents the blocks which
647 * are used by this file. This allows recovery to restart truncate
648 * on orphans if we crash during truncate. We actually write i_disksize
649 * into the on-disk inode when writing inodes out, instead of i_size.
650 *
651 * The only time when i_disksize and i_size may be different is when
652 * a truncate is in progress. The only things which change i_disksize
653 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
654 */
655 loff_t i_disksize;
656
657 /*
658 * i_data_sem is for serialising ext4_truncate() against
659 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
660 * data tree are chopped off during truncate. We can't do that in
661 * ext4 because whenever we perform intermediate commits during
662 * truncate, the inode and all the metadata blocks *must* be in a
663 * consistent state which allows truncation of the orphans to restart
664 * during recovery. Hence we must fix the get_block-vs-truncate race
665 * by other means, so we have i_data_sem.
666 */
667 struct rw_semaphore i_data_sem;
668 struct inode vfs_inode;
669 struct jbd2_inode jinode;
670
671 struct ext4_ext_cache i_cached_extent;
672 /*
673 * File creation time. Its function is same as that of
674 * struct timespec i_{a,c,m}time in the generic inode.
675 */
676 struct timespec i_crtime;
677
678 /* mballoc */
679 struct list_head i_prealloc_list;
680 spinlock_t i_prealloc_lock;
681
682 /* ialloc */
683 ext4_group_t i_last_alloc_group;
684
685 /* allocation reservation info for delalloc */
686 unsigned int i_reserved_data_blocks;
687 unsigned int i_reserved_meta_blocks;
688 unsigned int i_allocated_meta_blocks;
689 unsigned short i_delalloc_reserved_flag;
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500690 sector_t i_da_metadata_calc_last_lblock;
691 int i_da_metadata_calc_len;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400692
693 /* on-disk additional length */
694 __u16 i_extra_isize;
695
696 spinlock_t i_block_reservation_lock;
Dmitry Monakhova9e7f442009-12-14 15:21:14 +0300697#ifdef CONFIG_QUOTA
698 /* quota space reservation, managed internally by quota code */
699 qsize_t i_reserved_quota;
700#endif
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400701
702 /* completed async DIOs that might need unwritten extents handling */
703 struct list_head i_aio_dio_complete_list;
704 /* current io_end structure for async DIO write*/
705 ext4_io_end_t *cur_aio_dio;
Jan Karab436b9b2009-12-08 23:51:10 -0500706
707 /*
708 * Transactions that contain inode's metadata needed to complete
709 * fsync and fdatasync, respectively.
710 */
711 tid_t i_sync_tid;
712 tid_t i_datasync_tid;
Theodore Ts'od444c3c2009-05-01 13:44:33 -0400713};
714
715/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700716 * File system states
717 */
Mingming Cao617ba132006-10-11 01:20:53 -0700718#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
719#define EXT4_ERROR_FS 0x0002 /* Errors detected */
720#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700721
722/*
Theodore Tso469108f2008-02-10 01:11:44 -0500723 * Misc. filesystem flags
724 */
725#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
726#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
727#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
728
729/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700730 * Mount flags
731 */
Mingming Cao617ba132006-10-11 01:20:53 -0700732#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
733#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
734#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
735#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
736#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
737#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
738#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
739#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
Mingming Cao617ba132006-10-11 01:20:53 -0700740#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
741#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
742#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
743#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
744#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
745#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
746#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
747#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
Theodore Ts'oafd46722009-03-16 23:12:23 -0400748#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
Mingming Cao617ba132006-10-11 01:20:53 -0700749#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
750#define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
751#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
752#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
753#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
Linus Torvaldsd4da6c92009-11-02 10:15:27 -0800754#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
Girish Shilamkar818d2762008-01-28 23:58:27 -0500755#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500756#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
Alex Tomas64769242008-07-11 19:27:31 -0400757#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400758#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400759#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
Eric Sandeen5328e632009-11-19 14:25:42 -0500760#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400761
Mingming Cao617ba132006-10-11 01:20:53 -0700762#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
763#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
764#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
765 EXT4_MOUNT_##opt)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700766
Mingming Cao617ba132006-10-11 01:20:53 -0700767#define ext4_set_bit ext2_set_bit
768#define ext4_set_bit_atomic ext2_set_bit_atomic
769#define ext4_clear_bit ext2_clear_bit
770#define ext4_clear_bit_atomic ext2_clear_bit_atomic
771#define ext4_test_bit ext2_test_bit
772#define ext4_find_first_zero_bit ext2_find_first_zero_bit
773#define ext4_find_next_zero_bit ext2_find_next_zero_bit
Aneesh Kumar K.Vaa02ad62008-01-28 23:58:27 -0500774#define ext4_find_next_bit ext2_find_next_bit
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700775
776/*
777 * Maximal mount counts between two filesystem checks
778 */
Mingming Cao617ba132006-10-11 01:20:53 -0700779#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
780#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700781
782/*
783 * Behaviour when detecting errors
784 */
Mingming Cao617ba132006-10-11 01:20:53 -0700785#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
786#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
787#define EXT4_ERRORS_PANIC 3 /* Panic */
788#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700789
790/*
791 * Structure of the super block
792 */
Mingming Cao617ba132006-10-11 01:20:53 -0700793struct ext4_super_block {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700794/*00*/ __le32 s_inodes_count; /* Inodes count */
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -0400795 __le32 s_blocks_count_lo; /* Blocks count */
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -0400796 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
797 __le32 s_free_blocks_count_lo; /* Free blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700798/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
799 __le32 s_first_data_block; /* First Data Block */
800 __le32 s_log_block_size; /* Block size */
Coly Lif077d0d2007-10-16 18:38:25 -0400801 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700802/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
Coly Lif077d0d2007-10-16 18:38:25 -0400803 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700804 __le32 s_inodes_per_group; /* # Inodes per group */
805 __le32 s_mtime; /* Mount time */
806/*30*/ __le32 s_wtime; /* Write time */
807 __le16 s_mnt_count; /* Mount count */
808 __le16 s_max_mnt_count; /* Maximal mount count */
809 __le16 s_magic; /* Magic signature */
810 __le16 s_state; /* File system state */
811 __le16 s_errors; /* Behaviour when detecting errors */
812 __le16 s_minor_rev_level; /* minor revision level */
813/*40*/ __le32 s_lastcheck; /* time of last check */
814 __le32 s_checkinterval; /* max. time between checks */
815 __le32 s_creator_os; /* OS */
816 __le32 s_rev_level; /* Revision level */
817/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
818 __le16 s_def_resgid; /* Default gid for reserved blocks */
819 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700820 * These fields are for EXT4_DYNAMIC_REV superblocks only.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700821 *
822 * Note: the difference between the compatible feature set and
823 * the incompatible feature set is that if there is a bit set
824 * in the incompatible feature set that the kernel doesn't
825 * know about, it should refuse to mount the filesystem.
826 *
827 * e2fsck's requirements are more strict; if it doesn't know
828 * about a feature in either the compatible or incompatible
829 * feature set, it must abort and not try to meddle with
830 * things it doesn't understand...
831 */
832 __le32 s_first_ino; /* First non-reserved inode */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700833 __le16 s_inode_size; /* size of inode structure */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700834 __le16 s_block_group_nr; /* block group # of this superblock */
835 __le32 s_feature_compat; /* compatible feature set */
836/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
837 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
838/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
839/*78*/ char s_volume_name[16]; /* volume name */
840/*88*/ char s_last_mounted[64]; /* directory where last mounted */
841/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
842 /*
843 * Performance hints. Directory preallocation should only
Mingming Cao617ba132006-10-11 01:20:53 -0700844 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700845 */
846 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
847 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
848 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
849 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700850 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700851 */
852/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
853/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
854 __le32 s_journal_dev; /* device number of journal file */
855 __le32 s_last_orphan; /* start of list of inodes to delete */
856 __le32 s_hash_seed[4]; /* HTREE hash seed */
857 __u8 s_def_hash_version; /* Default hash version to use */
858 __u8 s_reserved_char_pad;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700859 __le16 s_desc_size; /* size of group descriptor */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700860/*100*/ __le32 s_default_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700861 __le32 s_first_meta_bg; /* First metablock block group */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700862 __le32 s_mkfs_time; /* When the filesystem was created */
863 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
864 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
865/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
866 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
867 __le32 s_free_blocks_count_hi; /* Free blocks count */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -0400868 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
869 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
870 __le32 s_flags; /* Miscellaneous flags */
871 __le16 s_raid_stride; /* RAID stride */
872 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
873 __le64 s_mmp_block; /* Block for multi-mount protection */
874 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400875 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
876 __u8 s_reserved_char_pad2;
877 __le16 s_reserved_pad;
Theodore Ts'oafc32f72009-02-28 19:39:58 -0500878 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
879 __u32 s_reserved[160]; /* Padding to the end of the block */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700880};
881
882#ifdef __KERNEL__
Theodore Ts'obc0b0d62009-06-13 10:09:48 -0400883
884/*
Theodore Ts'o4ab2f152009-06-13 10:09:36 -0400885 * run-time mount flags
Theodore Ts'obc0b0d62009-06-13 10:09:48 -0400886 */
887#define EXT4_MF_MNTDIR_SAMPLED 0x0001
Theodore Ts'o4ab2f152009-06-13 10:09:36 -0400888#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
Theodore Ts'obc0b0d62009-06-13 10:09:48 -0400889
Theodore Ts'oca0faba2009-05-03 16:33:44 -0400890/*
891 * fourth extended-fs super-block data in memory
892 */
893struct ext4_sb_info {
894 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
895 unsigned long s_inodes_per_block;/* Number of inodes per block */
896 unsigned long s_blocks_per_group;/* Number of blocks in a group */
897 unsigned long s_inodes_per_group;/* Number of inodes in a group */
898 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
899 unsigned long s_gdb_count; /* Number of group descriptor blocks */
900 unsigned long s_desc_per_block; /* Number of group descriptors per block */
901 ext4_group_t s_groups_count; /* Number of groups in the fs */
Eric Sandeenfb0a3872009-09-16 14:45:10 -0400902 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
Theodore Ts'oca0faba2009-05-03 16:33:44 -0400903 unsigned long s_overhead_last; /* Last calculated overhead */
904 unsigned long s_blocks_last; /* Last seen block count */
905 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
906 struct buffer_head * s_sbh; /* Buffer containing the super block */
907 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
908 struct buffer_head **s_group_desc;
Theodore Ts'o7f4520c2009-06-13 10:09:41 -0400909 unsigned int s_mount_opt;
Theodore Ts'obc0b0d62009-06-13 10:09:48 -0400910 unsigned int s_mount_flags;
Theodore Ts'oca0faba2009-05-03 16:33:44 -0400911 ext4_fsblk_t s_sb_block;
912 uid_t s_resuid;
913 gid_t s_resgid;
914 unsigned short s_mount_state;
915 unsigned short s_pad;
916 int s_addr_per_block_bits;
917 int s_desc_per_block_bits;
918 int s_inode_size;
919 int s_first_ino;
920 unsigned int s_inode_readahead_blks;
Andreas Dilger11013912009-06-13 11:45:35 -0400921 unsigned int s_inode_goal;
Theodore Ts'oca0faba2009-05-03 16:33:44 -0400922 spinlock_t s_next_gen_lock;
923 u32 s_next_generation;
924 u32 s_hash_seed[4];
925 int s_def_hash_version;
926 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
927 struct percpu_counter s_freeblocks_counter;
928 struct percpu_counter s_freeinodes_counter;
929 struct percpu_counter s_dirs_counter;
930 struct percpu_counter s_dirtyblocks_counter;
931 struct blockgroup_lock *s_blockgroup_lock;
932 struct proc_dir_entry *s_proc;
933 struct kobject s_kobj;
934 struct completion s_kobj_unregister;
935
936 /* Journaling */
937 struct inode *s_journal_inode;
938 struct journal_s *s_journal;
939 struct list_head s_orphan;
940 struct mutex s_orphan_lock;
941 struct mutex s_resize_lock;
942 unsigned long s_commit_interval;
943 u32 s_max_batch_time;
944 u32 s_min_batch_time;
945 struct block_device *journal_bdev;
946#ifdef CONFIG_JBD2_DEBUG
947 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
948 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
949#endif
950#ifdef CONFIG_QUOTA
951 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
952 int s_jquota_fmt; /* Format of quota to use */
953#endif
954 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
Theodore Ts'o6fd058f2009-05-17 15:38:01 -0400955 struct rb_root system_blks;
Theodore Ts'oca0faba2009-05-03 16:33:44 -0400956
957#ifdef EXTENTS_STATS
958 /* ext4 extents stats */
959 unsigned long s_ext_min;
960 unsigned long s_ext_max;
961 unsigned long s_depth_max;
962 spinlock_t s_ext_stats_lock;
963 unsigned long s_ext_blocks;
964 unsigned long s_ext_extents;
965#endif
966
967 /* for buddy allocator */
968 struct ext4_group_info ***s_group_info;
969 struct inode *s_buddy_cache;
970 long s_blocks_reserved;
971 spinlock_t s_reserve_lock;
972 spinlock_t s_md_lock;
973 tid_t s_last_transaction;
974 unsigned short *s_mb_offsets;
975 unsigned int *s_mb_maxs;
976
977 /* tunables */
978 unsigned long s_stripe;
979 unsigned int s_mb_stream_request;
980 unsigned int s_mb_max_to_scan;
981 unsigned int s_mb_min_to_scan;
982 unsigned int s_mb_stats;
983 unsigned int s_mb_order2_reqs;
984 unsigned int s_mb_group_prealloc;
Theodore Ts'o55138e02009-09-29 13:31:31 -0400985 unsigned int s_max_writeback_mb_bump;
Theodore Ts'oca0faba2009-05-03 16:33:44 -0400986 /* where last allocation was done - for stream allocation */
987 unsigned long s_mb_last_group;
988 unsigned long s_mb_last_start;
989
Theodore Ts'oca0faba2009-05-03 16:33:44 -0400990 /* stats for buddy allocator */
991 spinlock_t s_mb_pa_lock;
992 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
993 atomic_t s_bal_success; /* we found long enough chunks */
994 atomic_t s_bal_allocated; /* in blocks */
995 atomic_t s_bal_ex_scanned; /* total extents scanned */
996 atomic_t s_bal_goals; /* goal hits */
997 atomic_t s_bal_breaks; /* too long searches */
998 atomic_t s_bal_2orders; /* 2^order hits */
999 spinlock_t s_bal_lock;
1000 unsigned long s_mb_buddies_generated;
1001 unsigned long long s_mb_generation_time;
1002 atomic_t s_mb_lost_chunks;
1003 atomic_t s_mb_preallocated;
1004 atomic_t s_mb_discarded;
Theodore Ts'o50797482009-09-18 13:34:02 -04001005 atomic_t s_lock_busy;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001006
1007 /* locality groups */
1008 struct ext4_locality_group *s_locality_groups;
1009
1010 /* for write statistics */
1011 unsigned long s_sectors_written_start;
1012 u64 s_kbytes_written;
1013
1014 unsigned int s_log_groups_per_flex;
1015 struct flex_groups *s_flex_groups;
Mingming Cao4c0425f2009-09-28 15:48:41 -04001016
1017 /* workqueue for dio unwritten */
1018 struct workqueue_struct *dio_unwritten_wq;
Theodore Ts'oca0faba2009-05-03 16:33:44 -04001019};
1020
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001021static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001022{
1023 return sb->s_fs_info;
1024}
Mingming Cao617ba132006-10-11 01:20:53 -07001025static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001026{
Mingming Cao617ba132006-10-11 01:20:53 -07001027 return container_of(inode, struct ext4_inode_info, vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001028}
1029
Kalpak Shahef7f3832007-07-18 09:15:20 -04001030static inline struct timespec ext4_current_time(struct inode *inode)
1031{
1032 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1033 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1034}
1035
Mingming Cao617ba132006-10-11 01:20:53 -07001036static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001037{
Mingming Cao617ba132006-10-11 01:20:53 -07001038 return ino == EXT4_ROOT_INO ||
1039 ino == EXT4_JOURNAL_INO ||
1040 ino == EXT4_RESIZE_INO ||
1041 (ino >= EXT4_FIRST_INO(sb) &&
1042 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001043}
Theodore Ts'o19f5fb72010-01-24 14:34:07 -05001044
1045/*
1046 * Inode dynamic state flags
1047 */
1048enum {
1049 EXT4_STATE_JDATA, /* journaled data exists */
1050 EXT4_STATE_NEW, /* inode is newly created */
1051 EXT4_STATE_XATTR, /* has in-inode xattrs */
1052 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1053 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1054 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1055 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1056};
1057
1058static inline int ext4_test_inode_state(struct inode *inode, int bit)
1059{
1060 return test_bit(bit, &EXT4_I(inode)->i_state_flags);
1061}
1062
1063static inline void ext4_set_inode_state(struct inode *inode, int bit)
1064{
1065 set_bit(bit, &EXT4_I(inode)->i_state_flags);
1066}
1067
1068static inline void ext4_clear_inode_state(struct inode *inode, int bit)
1069{
1070 clear_bit(bit, &EXT4_I(inode)->i_state_flags);
1071}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001072#else
Mingming Cao617ba132006-10-11 01:20:53 -07001073/* Assume that user mode programs are passing in an ext4fs superblock, not
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001074 * a kernel struct super_block. This will allow us to call the feature-test
1075 * macros from user land. */
Mingming Cao617ba132006-10-11 01:20:53 -07001076#define EXT4_SB(sb) (sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001077#endif
1078
Mingming Cao617ba132006-10-11 01:20:53 -07001079#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001080
1081/*
1082 * Codes for operating systems
1083 */
Mingming Cao617ba132006-10-11 01:20:53 -07001084#define EXT4_OS_LINUX 0
1085#define EXT4_OS_HURD 1
1086#define EXT4_OS_MASIX 2
1087#define EXT4_OS_FREEBSD 3
1088#define EXT4_OS_LITES 4
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001089
1090/*
1091 * Revision levels
1092 */
Mingming Cao617ba132006-10-11 01:20:53 -07001093#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1094#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001095
Mingming Cao617ba132006-10-11 01:20:53 -07001096#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1097#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001098
Mingming Cao617ba132006-10-11 01:20:53 -07001099#define EXT4_GOOD_OLD_INODE_SIZE 128
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001100
1101/*
1102 * Feature set definitions
1103 */
1104
Mingming Cao617ba132006-10-11 01:20:53 -07001105#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001106 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001107#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001108 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001109#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001110 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001111#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1112 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1113#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1114 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1115#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1116 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1117#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1118 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1119#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1120 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1121#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1122 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001123
Mingming Cao617ba132006-10-11 01:20:53 -07001124#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1125#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1126#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1127#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1128#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1129#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001130
Mingming Cao617ba132006-10-11 01:20:53 -07001131#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1132#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1133#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001134#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
Andreas Dilger717d50e2007-10-16 18:38:25 -04001135#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001136#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
Kalpak Shahef7f3832007-07-18 09:15:20 -04001137#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001138
Mingming Cao617ba132006-10-11 01:20:53 -07001139#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1140#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1141#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1142#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1143#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
Alex Tomasa86c6182006-10-11 01:21:03 -07001144#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001145#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001146#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
Jose R. Santosce421582007-10-16 18:38:25 -04001147#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
Theodore Ts'of710b4b2010-01-25 03:31:32 -05001148#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1149#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001150
Mingming Cao617ba132006-10-11 01:20:53 -07001151#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1152#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1153 EXT4_FEATURE_INCOMPAT_RECOVER| \
Alex Tomasa86c6182006-10-11 01:21:03 -07001154 EXT4_FEATURE_INCOMPAT_META_BG| \
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001155 EXT4_FEATURE_INCOMPAT_EXTENTS| \
Jose R. Santosce421582007-10-16 18:38:25 -04001156 EXT4_FEATURE_INCOMPAT_64BIT| \
1157 EXT4_FEATURE_INCOMPAT_FLEX_BG)
Mingming Cao617ba132006-10-11 01:20:53 -07001158#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1159 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
Andreas Dilger717d50e2007-10-16 18:38:25 -04001160 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
Andreas Dilgerf8628a12007-07-18 08:38:01 -04001161 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
Kalpak Shahef7f3832007-07-18 09:15:20 -04001162 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001163 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1164 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001165
1166/*
1167 * Default values for user and/or group using reserved blocks
1168 */
Mingming Cao617ba132006-10-11 01:20:53 -07001169#define EXT4_DEF_RESUID 0
1170#define EXT4_DEF_RESGID 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001171
Theodore Ts'o240799c2008-10-09 23:53:47 -04001172#define EXT4_DEF_INODE_READAHEAD_BLKS 32
1173
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001174/*
1175 * Default mount options
1176 */
Mingming Cao617ba132006-10-11 01:20:53 -07001177#define EXT4_DEFM_DEBUG 0x0001
1178#define EXT4_DEFM_BSDGROUPS 0x0002
1179#define EXT4_DEFM_XATTR_USER 0x0004
1180#define EXT4_DEFM_ACL 0x0008
1181#define EXT4_DEFM_UID16 0x0010
1182#define EXT4_DEFM_JMODE 0x0060
1183#define EXT4_DEFM_JMODE_DATA 0x0020
1184#define EXT4_DEFM_JMODE_ORDERED 0x0040
1185#define EXT4_DEFM_JMODE_WBACK 0x0060
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001186
1187/*
Theodore Ts'o30773842009-01-03 20:27:38 -05001188 * Default journal batch times
1189 */
1190#define EXT4_DEF_MIN_BATCH_TIME 0
1191#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1192
1193/*
Theodore Ts'oa4912122009-03-12 12:18:34 -04001194 * Minimum number of groups in a flexgroup before we separate out
1195 * directories into the first block group of a flexgroup
1196 */
1197#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1198
1199/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001200 * Structure of a directory entry
1201 */
Mingming Cao617ba132006-10-11 01:20:53 -07001202#define EXT4_NAME_LEN 255
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001203
Mingming Cao617ba132006-10-11 01:20:53 -07001204struct ext4_dir_entry {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001205 __le32 inode; /* Inode number */
1206 __le16 rec_len; /* Directory entry length */
1207 __le16 name_len; /* Name length */
Mingming Cao617ba132006-10-11 01:20:53 -07001208 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001209};
1210
1211/*
Mingming Cao617ba132006-10-11 01:20:53 -07001212 * The new version of the directory entry. Since EXT4 structures are
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001213 * stored in intel byte order, and the name_len field could never be
1214 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1215 * file_type field.
1216 */
Mingming Cao617ba132006-10-11 01:20:53 -07001217struct ext4_dir_entry_2 {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001218 __le32 inode; /* Inode number */
1219 __le16 rec_len; /* Directory entry length */
1220 __u8 name_len; /* Name length */
1221 __u8 file_type;
Mingming Cao617ba132006-10-11 01:20:53 -07001222 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001223};
1224
1225/*
Mingming Cao617ba132006-10-11 01:20:53 -07001226 * Ext4 directory file types. Only the low 3 bits are used. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001227 * other bits are reserved for now.
1228 */
Mingming Cao617ba132006-10-11 01:20:53 -07001229#define EXT4_FT_UNKNOWN 0
1230#define EXT4_FT_REG_FILE 1
1231#define EXT4_FT_DIR 2
1232#define EXT4_FT_CHRDEV 3
1233#define EXT4_FT_BLKDEV 4
1234#define EXT4_FT_FIFO 5
1235#define EXT4_FT_SOCK 6
1236#define EXT4_FT_SYMLINK 7
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001237
Mingming Cao617ba132006-10-11 01:20:53 -07001238#define EXT4_FT_MAX 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001239
1240/*
Mingming Cao617ba132006-10-11 01:20:53 -07001241 * EXT4_DIR_PAD defines the directory entries boundaries
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001242 *
1243 * NOTE: It must be a multiple of 4
1244 */
Mingming Cao617ba132006-10-11 01:20:53 -07001245#define EXT4_DIR_PAD 4
1246#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1247#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1248 ~EXT4_DIR_ROUND)
Jan Karaa72d7f82008-01-28 23:58:27 -05001249#define EXT4_MAX_REC_LEN ((1<<16)-1)
1250
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001251/*
1252 * Hash Tree Directory indexing
1253 * (c) Daniel Phillips, 2001
1254 */
1255
Eric Sandeen4074fe32007-10-16 18:38:25 -04001256#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1257 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
Mingming Cao617ba132006-10-11 01:20:53 -07001258 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
1259#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1260#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001261
1262/* Legal values for the dx_root hash_version field: */
1263
1264#define DX_HASH_LEGACY 0
1265#define DX_HASH_HALF_MD4 1
1266#define DX_HASH_TEA 2
Theodore Ts'of99b2582008-10-28 13:21:44 -04001267#define DX_HASH_LEGACY_UNSIGNED 3
1268#define DX_HASH_HALF_MD4_UNSIGNED 4
1269#define DX_HASH_TEA_UNSIGNED 5
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001270
1271#ifdef __KERNEL__
1272
1273/* hash info structure used by the directory hash */
1274struct dx_hash_info
1275{
1276 u32 hash;
1277 u32 minor_hash;
1278 int hash_version;
1279 u32 *seed;
1280};
1281
Mingming Cao617ba132006-10-11 01:20:53 -07001282#define EXT4_HTREE_EOF 0x7fffffff
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001283
1284/*
Mingming Cao617ba132006-10-11 01:20:53 -07001285 * Control parameters used by ext4_htree_next_block
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001286 */
1287#define HASH_NB_ALWAYS 1
1288
1289
1290/*
1291 * Describe an inode's exact location on disk and in memory
1292 */
Mingming Cao617ba132006-10-11 01:20:53 -07001293struct ext4_iloc
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001294{
1295 struct buffer_head *bh;
1296 unsigned long offset;
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001297 ext4_group_t block_group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001298};
1299
Mingming Cao617ba132006-10-11 01:20:53 -07001300static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001301{
Mingming Cao617ba132006-10-11 01:20:53 -07001302 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001303}
1304
1305/*
1306 * This structure is stuffed into the struct file's private_data field
1307 * for directories. It is where we put information so that we can do
1308 * readdir operations in hash tree order.
1309 */
1310struct dir_private_info {
1311 struct rb_root root;
1312 struct rb_node *curr_node;
1313 struct fname *extra_fname;
1314 loff_t last_pos;
1315 __u32 curr_hash;
1316 __u32 curr_minor_hash;
1317 __u32 next_hash;
1318};
1319
1320/* calculate the first block number of the group */
Mingming Cao617ba132006-10-11 01:20:53 -07001321static inline ext4_fsblk_t
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001322ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001323{
Mingming Cao617ba132006-10-11 01:20:53 -07001324 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1325 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001326}
1327
1328/*
1329 * Special error return code only used by dx_probe() and its callers.
1330 */
1331#define ERR_BAD_DX_DIR -75000
1332
Andrew Morton72b64b52006-10-11 01:21:18 -07001333void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05001334 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001335
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04001336extern struct proc_dir_entry *ext4_proc_root;
1337
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001338/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001339 * Function prototypes
1340 */
1341
1342/*
1343 * Ok, these declarations are also in <linux/kernel.h> but none of the
Mingming Cao617ba132006-10-11 01:20:53 -07001344 * ext4 source programs needs to include it so they are duplicated here.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001345 */
Dave Kleikamp8c55e202007-05-24 13:04:54 -04001346# define NORET_TYPE /**/
1347# define ATTRIB_NORET __attribute__((noreturn))
1348# define NORET_AND noreturn,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001349
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001350/* bitmap.c */
1351extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1352
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001353/* balloc.c */
Mingming Cao3a5b2ec2006-10-11 01:21:05 -07001354extern unsigned int ext4_block_group(struct super_block *sb,
1355 ext4_fsblk_t blocknr);
1356extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1357 ext4_fsblk_t blocknr);
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001358extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1359extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1360 ext4_group_t group);
Aneesh Kumar K.V7061eba2008-07-11 19:27:31 -04001361extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
Mingming Cao617ba132006-10-11 01:20:53 -07001362 ext4_fsblk_t goal, unsigned long *count, int *errp);
Aneesh Kumar K.V5c791612008-10-08 23:12:24 -04001363extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
Eric Sandeen8c3bf8a2008-10-28 00:08:12 -04001364extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
Aneesh Kumar K.Ve21675d2009-01-05 21:36:02 -05001365extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1366 ext4_fsblk_t block, unsigned long count);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001367extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1368extern void ext4_check_blocks_bitmap(struct super_block *);
Mingming Cao617ba132006-10-11 01:20:53 -07001369extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001370 ext4_group_t block_group,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001371 struct buffer_head ** bh);
Mingming Cao617ba132006-10-11 01:20:53 -07001372extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
Theodore Ts'obb23c202009-05-01 19:44:44 -04001373struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1374 ext4_group_t block_group);
1375extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1376 struct buffer_head *bh,
1377 ext4_group_t group,
1378 struct ext4_group_desc *desc);
1379#define ext4_free_blocks_after_init(sb, group, desc) \
1380 ext4_init_block_bitmap(sb, NULL, group, desc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001381
1382/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001383extern int ext4_check_dir_entry(const char *, struct inode *,
1384 struct ext4_dir_entry_2 *,
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001385 struct buffer_head *, unsigned int);
Mingming Cao617ba132006-10-11 01:20:53 -07001386extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001387 __u32 minor_hash,
Mingming Cao617ba132006-10-11 01:20:53 -07001388 struct ext4_dir_entry_2 *dirent);
1389extern void ext4_htree_free_dir_info(struct dir_private_info *p);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001390
1391/* fsync.c */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001392extern int ext4_sync_file(struct file *, struct dentry *, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001393
1394/* hash.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001395extern int ext4fs_dirhash(const char *name, int len, struct
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001396 dx_hash_info *hinfo);
1397
1398/* ialloc.c */
Theodore Ts'of157a4a2009-06-13 11:09:42 -04001399extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
Andreas Dilger11013912009-06-13 11:45:35 -04001400 const struct qstr *qstr, __u32 goal);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001401extern void ext4_free_inode(handle_t *, struct inode *);
1402extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1403extern unsigned long ext4_count_free_inodes(struct super_block *);
1404extern unsigned long ext4_count_dirs(struct super_block *);
1405extern void ext4_check_inodes_bitmap(struct super_block *);
Theodore Ts'obb23c202009-05-01 19:44:44 -04001406extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
1407 struct buffer_head *bh,
1408 ext4_group_t group,
1409 struct ext4_group_desc *desc);
1410extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001411
Alex Tomasc9de5602008-01-29 00:19:52 -05001412/* mballoc.c */
1413extern long ext4_mb_stats;
1414extern long ext4_mb_max_to_scan;
1415extern int ext4_mb_init(struct super_block *, int);
1416extern int ext4_mb_release(struct super_block *);
1417extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1418 struct ext4_allocation_request *, int *);
1419extern int ext4_mb_reserve_blocks(struct super_block *, int);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04001420extern void ext4_discard_preallocations(struct inode *);
Alex Tomasc9de5602008-01-29 00:19:52 -05001421extern int __init init_ext4_mballoc(void);
1422extern void exit_ext4_mballoc(void);
Theodore Ts'o44338712009-11-22 07:44:56 -05001423extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
Theodore Ts'oe6362602009-11-23 07:17:05 -05001424 struct buffer_head *bh, ext4_fsblk_t block,
1425 unsigned long count, int flags);
Aneesh Kumar K.V920313a2009-01-05 21:36:19 -05001426extern int ext4_mb_add_groupinfo(struct super_block *sb,
Frederic Bohe5f21b0e2008-07-11 19:27:31 -04001427 ext4_group_t i, struct ext4_group_desc *desc);
Aneesh Kumar K.V920313a2009-01-05 21:36:19 -05001428extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1429extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1430 ext4_group_t, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001431/* inode.c */
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001432struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1433 ext4_lblk_t, int, int *);
1434struct buffer_head *ext4_bread(handle_t *, struct inode *,
1435 ext4_lblk_t, int, int *);
Eric Sandeen6873fa02008-10-07 00:46:36 -04001436int ext4_get_block(struct inode *inode, sector_t iblock,
1437 struct buffer_head *bh_result, int create);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001438
David Howells1d1fe1e2008-02-07 00:15:37 -08001439extern struct inode *ext4_iget(struct super_block *, unsigned long);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001440extern int ext4_write_inode(struct inode *, int);
1441extern int ext4_setattr(struct dentry *, struct iattr *);
Mingming Cao3e3398a2008-07-11 19:27:31 -04001442extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1443 struct kstat *stat);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001444extern void ext4_delete_inode(struct inode *);
1445extern int ext4_sync_inode(handle_t *, struct inode *);
Mingming Cao617ba132006-10-11 01:20:53 -07001446extern void ext4_dirty_inode(struct inode *);
1447extern int ext4_change_inode_journal_flag(struct inode *, int);
1448extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
Duane Griffin91ef4ca2008-07-11 19:27:31 -04001449extern int ext4_can_truncate(struct inode *inode);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001450extern void ext4_truncate(struct inode *);
Jan Kara487caee2009-08-17 22:17:20 -04001451extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
Mingming Cao617ba132006-10-11 01:20:53 -07001452extern void ext4_set_inode_flags(struct inode *);
Jan Karaff9ddf72007-07-18 09:24:20 -04001453extern void ext4_get_inode_flags(struct ext4_inode_info *);
Theodore Ts'occd25062009-02-26 01:04:07 -05001454extern int ext4_alloc_da_blocks(struct inode *inode);
Mingming Cao617ba132006-10-11 01:20:53 -07001455extern void ext4_set_aops(struct inode *inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07001456extern int ext4_writepage_trans_blocks(struct inode *);
Mingming Caoa02908f2008-08-19 22:16:07 -04001457extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
Mingming Caof3bd1f32008-08-19 22:16:03 -04001458extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
Jan Karacf108bc2008-07-11 19:27:31 -04001459extern int ext4_block_truncate_page(handle_t *handle,
Alex Tomasa86c6182006-10-11 01:21:03 -07001460 struct address_space *mapping, loff_t from);
Nick Pigginc2ec1752009-03-31 15:23:21 -07001461extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
Dmitry Monakhova9e7f442009-12-14 15:21:14 +03001462extern qsize_t *ext4_get_reserved_space(struct inode *inode);
Mingming Cao8d5d02e2009-09-28 15:48:29 -04001463extern int flush_aio_dio_completed_IO(struct inode *inode);
Aneesh Kumar K.V5f634d02010-01-25 04:00:31 -05001464extern void ext4_da_update_reserve_space(struct inode *inode,
1465 int used, int quota_claim);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001466/* ioctl.c */
Andi Kleen5cdd7b22008-04-29 22:03:54 -04001467extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001468extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001469
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -05001470/* migrate.c */
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -04001471extern int ext4_ext_migrate(struct inode *);
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001472
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001473/* namei.c */
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001474extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1475extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
Mingming Cao617ba132006-10-11 01:20:53 -07001476extern int ext4_orphan_add(handle_t *, struct inode *);
1477extern int ext4_orphan_del(handle_t *, struct inode *);
1478extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001479 __u32 start_minor_hash, __u32 *next_hash);
1480
1481/* resize.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001482extern int ext4_group_add(struct super_block *sb,
1483 struct ext4_new_group_data *input);
1484extern int ext4_group_extend(struct super_block *sb,
1485 struct ext4_super_block *es,
1486 ext4_fsblk_t n_blocks_count);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001487
1488/* super.c */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001489extern void ext4_error(struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001490 __attribute__ ((format (printf, 3, 4)));
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001491extern void __ext4_std_error(struct super_block *, const char *, int);
1492extern void ext4_abort(struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001493 __attribute__ ((format (printf, 3, 4)));
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001494extern void ext4_warning(struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001495 __attribute__ ((format (printf, 3, 4)));
Eric Sandeenb31e1552009-06-04 17:36:36 -04001496extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1497 __attribute__ ((format (printf, 3, 4)));
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001498extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1499 const char *, const char *, ...)
1500 __attribute__ ((format (printf, 4, 5)));
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001501extern void ext4_update_dynamic_rev(struct super_block *sb);
Aneesh Kumar K.V99e6f822008-01-28 23:58:27 -05001502extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1503 __u32 compat);
1504extern int ext4_update_rocompat_feature(handle_t *handle,
1505 struct super_block *sb, __u32 rocompat);
1506extern int ext4_update_incompat_feature(handle_t *handle,
1507 struct super_block *sb, __u32 incompat);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001508extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1509 struct ext4_group_desc *bg);
1510extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1511 struct ext4_group_desc *bg);
1512extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1513 struct ext4_group_desc *bg);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05001514extern __u32 ext4_free_blks_count(struct super_block *sb,
1515 struct ext4_group_desc *bg);
1516extern __u32 ext4_free_inodes_count(struct super_block *sb,
1517 struct ext4_group_desc *bg);
1518extern __u32 ext4_used_dirs_count(struct super_block *sb,
1519 struct ext4_group_desc *bg);
1520extern __u32 ext4_itable_unused_count(struct super_block *sb,
1521 struct ext4_group_desc *bg);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001522extern void ext4_block_bitmap_set(struct super_block *sb,
1523 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1524extern void ext4_inode_bitmap_set(struct super_block *sb,
1525 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1526extern void ext4_inode_table_set(struct super_block *sb,
1527 struct ext4_group_desc *bg, ext4_fsblk_t blk);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05001528extern void ext4_free_blks_set(struct super_block *sb,
1529 struct ext4_group_desc *bg, __u32 count);
1530extern void ext4_free_inodes_set(struct super_block *sb,
1531 struct ext4_group_desc *bg, __u32 count);
1532extern void ext4_used_dirs_set(struct super_block *sb,
1533 struct ext4_group_desc *bg, __u32 count);
1534extern void ext4_itable_unused_set(struct super_block *sb,
1535 struct ext4_group_desc *bg, __u32 count);
Theodore Ts'obb23c202009-05-01 19:44:44 -04001536extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1537 struct ext4_group_desc *gdp);
1538extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1539 struct ext4_group_desc *gdp);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001540
1541static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1542{
1543 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001544 le32_to_cpu(es->s_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001545}
1546
1547static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1548{
1549 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001550 le32_to_cpu(es->s_r_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001551}
1552
1553static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1554{
1555 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001556 le32_to_cpu(es->s_free_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001557}
1558
1559static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1560 ext4_fsblk_t blk)
1561{
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001562 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001563 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1564}
1565
1566static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1567 ext4_fsblk_t blk)
1568{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001569 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001570 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1571}
1572
1573static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1574 ext4_fsblk_t blk)
1575{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001576 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001577 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1578}
1579
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001580static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1581{
Theodore Ts'o06a279d2009-01-17 18:41:37 -05001582 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1583 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1584 le32_to_cpu(raw_inode->i_size_lo);
1585 else
1586 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001587}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001588
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001589static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1590{
1591 raw_inode->i_size_lo = cpu_to_le32(i_size);
1592 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1593}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001594
Alex Tomasc9de5602008-01-29 00:19:52 -05001595static inline
1596struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001597 ext4_group_t group)
Alex Tomasc9de5602008-01-29 00:19:52 -05001598{
1599 struct ext4_group_info ***grp_info;
1600 long indexv, indexh;
1601 grp_info = EXT4_SB(sb)->s_group_info;
1602 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1603 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1604 return grp_info[indexv][indexh];
1605}
1606
Theodore Ts'o8df96752009-05-01 08:50:38 -04001607/*
1608 * Reading s_groups_count requires using smp_rmb() afterwards. See
1609 * the locking protocol documented in the comments of ext4_group_add()
1610 * in resize.c
1611 */
1612static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1613{
1614 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
1615
1616 smp_rmb();
1617 return ngroups;
1618}
Alex Tomasc9de5602008-01-29 00:19:52 -05001619
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001620static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1621 ext4_group_t block_group)
1622{
1623 return block_group >> sbi->s_log_groups_per_flex;
1624}
1625
1626static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1627{
1628 return 1 << sbi->s_log_groups_per_flex;
1629}
1630
Mingming Cao617ba132006-10-11 01:20:53 -07001631#define ext4_std_error(sb, errno) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001632do { \
1633 if ((errno)) \
Stoyan Gaydarov4db9c542008-07-13 21:03:29 -04001634 __ext4_std_error((sb), __func__, (errno)); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001635} while (0)
1636
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04001637#ifdef CONFIG_SMP
Eric Dumazet179f7eb2009-01-06 14:41:04 -08001638/* Each CPU can accumulate percpu_counter_batch blocks in their local
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04001639 * counters. So we need to make sure we have free blocks more
Eric Dumazet179f7eb2009-01-06 14:41:04 -08001640 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04001641 */
Eric Dumazet179f7eb2009-01-06 14:41:04 -08001642#define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04001643#else
1644#define EXT4_FREEBLOCKS_WATERMARK 0
1645#endif
1646
Aneesh Kumar K.Vcf17fea2008-09-13 13:06:18 -04001647static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1648{
1649 /*
1650 * XXX: replace with spinlock if seen contended -bzzz
1651 */
1652 down_write(&EXT4_I(inode)->i_data_sem);
1653 if (newsize > EXT4_I(inode)->i_disksize)
1654 EXT4_I(inode)->i_disksize = newsize;
1655 up_write(&EXT4_I(inode)->i_data_sem);
1656 return ;
1657}
Aneesh Kumar K.Va30d5422008-10-09 10:56:23 -04001658
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001659struct ext4_group_info {
1660 unsigned long bb_state;
1661 struct rb_root bb_free_root;
Eric Sandeena36b4492009-08-25 22:36:45 -04001662 ext4_grpblk_t bb_first_free; /* first free block */
1663 ext4_grpblk_t bb_free; /* total free blocks */
1664 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001665 struct list_head bb_prealloc_list;
1666#ifdef DOUBLE_CHECK
1667 void *bb_bitmap;
1668#endif
1669 struct rw_semaphore alloc_sem;
Eric Sandeena36b4492009-08-25 22:36:45 -04001670 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
1671 * regions, index is order.
1672 * bb_counters[3] = 5 means
1673 * 5 free 8-block regions. */
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001674};
1675
1676#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001677
1678#define EXT4_MB_GRP_NEED_INIT(grp) \
1679 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1680
Theodore Ts'o50797482009-09-18 13:34:02 -04001681#define EXT4_MAX_CONTENTION 8
1682#define EXT4_CONTENTION_THRESHOLD 2
1683
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04001684static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1685 ext4_group_t group)
1686{
1687 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1688}
1689
Theodore Ts'o50797482009-09-18 13:34:02 -04001690/*
1691 * Returns true if the filesystem is busy enough that attempts to
1692 * access the block group locks has run into contention.
1693 */
1694static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
1695{
1696 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
1697}
1698
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001699static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1700{
Theodore Ts'o50797482009-09-18 13:34:02 -04001701 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
1702 if (spin_trylock(lock))
1703 /*
1704 * We're able to grab the lock right away, so drop the
1705 * lock contention counter.
1706 */
1707 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
1708 else {
1709 /*
1710 * The lock is busy, so bump the contention counter,
1711 * and then wait on the spin lock.
1712 */
1713 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
1714 EXT4_MAX_CONTENTION);
1715 spin_lock(lock);
1716 }
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001717}
1718
1719static inline void ext4_unlock_group(struct super_block *sb,
1720 ext4_group_t group)
1721{
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04001722 spin_unlock(ext4_group_lock_ptr(sb, group));
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001723}
1724
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001725/*
1726 * Inodes and files operations
1727 */
1728
1729/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001730extern const struct file_operations ext4_dir_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001731
1732/* file.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001733extern const struct inode_operations ext4_file_inode_operations;
Mingming Cao617ba132006-10-11 01:20:53 -07001734extern const struct file_operations ext4_file_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001735
1736/* namei.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001737extern const struct inode_operations ext4_dir_inode_operations;
1738extern const struct inode_operations ext4_special_inode_operations;
Theodore Ts'o596397b2009-05-01 13:49:15 -04001739extern struct dentry *ext4_get_parent(struct dentry *child);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001740
1741/* symlink.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001742extern const struct inode_operations ext4_symlink_inode_operations;
1743extern const struct inode_operations ext4_fast_symlink_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001744
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04001745/* block_validity */
1746extern void ext4_release_system_zone(struct super_block *sb);
1747extern int ext4_setup_system_zone(struct super_block *sb);
1748extern int __init init_ext4_system_zone(void);
1749extern void exit_ext4_system_zone(void);
1750extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
1751 ext4_fsblk_t start_blk,
1752 unsigned int count);
1753
Alex Tomasa86c6182006-10-11 01:21:03 -07001754/* extents.c */
1755extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1756extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
Mingming Caoa02908f2008-08-19 22:16:07 -04001757extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1758 int chunk);
Alex Tomasa86c6182006-10-11 01:21:03 -07001759extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001760 ext4_lblk_t iblock, unsigned int max_blocks,
Theodore Ts'oc2177052009-05-14 00:58:52 -04001761 struct buffer_head *bh_result, int flags);
Jan Karacf108bc2008-07-11 19:27:31 -04001762extern void ext4_ext_truncate(struct inode *);
Alex Tomasa86c6182006-10-11 01:21:03 -07001763extern void ext4_ext_init(struct super_block *);
1764extern void ext4_ext_release(struct super_block *);
Amit Aroraa2df2a62007-07-17 21:42:41 -04001765extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1766 loff_t len);
Mingming Cao00314622009-09-28 15:49:08 -04001767extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
Eric Sandeena1de02d2010-02-04 23:58:38 -05001768 ssize_t len);
Theodore Ts'o12b7ac12009-05-14 00:57:44 -04001769extern int ext4_get_blocks(handle_t *handle, struct inode *inode,
1770 sector_t block, unsigned int max_blocks,
Theodore Ts'oc2177052009-05-14 00:58:52 -04001771 struct buffer_head *bh, int flags);
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001772extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1773 __u64 start, __u64 len);
Akira Fujita748de672009-06-17 19:24:03 -04001774/* move_extent.c */
1775extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
1776 __u64 start_orig, __u64 start_donor,
1777 __u64 len, __u64 *moved_len);
1778
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001779
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -05001780/*
1781 * Add new method to test wether block and inode bitmaps are properly
1782 * initialized. With uninit_bg reading the block from disk is not enough
1783 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1784 */
1785#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1786
1787static inline int bitmap_uptodate(struct buffer_head *bh)
1788{
1789 return (buffer_uptodate(bh) &&
1790 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1791}
1792static inline void set_bitmap_uptodate(struct buffer_head *bh)
1793{
1794 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1795}
1796
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001797#endif /* __KERNEL__ */
1798
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04001799#endif /* _EXT4_H */