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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>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040024#include "ext4_i.h"
Alex Tomasc9de5602008-01-29 00:19:52 -050025
Dave Kleikampac27a0e2006-10-11 01:20:50 -070026/*
Shen Feng8a356942008-07-11 19:27:31 -040027 * The fourth extended filesystem constants/structures
Dave Kleikampac27a0e2006-10-11 01:20:50 -070028 */
29
30/*
Mingming Cao617ba132006-10-11 01:20:53 -070031 * Define EXT4FS_DEBUG to produce debug messages
Dave Kleikampac27a0e2006-10-11 01:20:50 -070032 */
Mingming Cao617ba132006-10-11 01:20:53 -070033#undef EXT4FS_DEBUG
Dave Kleikampac27a0e2006-10-11 01:20:50 -070034
35/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -070036 * Debug code
37 */
Mingming Cao617ba132006-10-11 01:20:53 -070038#ifdef EXT4FS_DEBUG
39#define ext4_debug(f, a...) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070040 do { \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040041 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
Stoyan Gaydarov4db9c542008-07-13 21:03:29 -040042 __FILE__, __LINE__, __func__); \
Theodore Ts'oaf5bc922008-09-08 22:25:24 -040043 printk(KERN_DEBUG f, ## a); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070044 } while (0)
45#else
Mingming Cao617ba132006-10-11 01:20:53 -070046#define ext4_debug(f, a...) do {} while (0)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070047#endif
48
Alex Tomasc9de5602008-01-29 00:19:52 -050049/* prefer goal again. length */
50#define EXT4_MB_HINT_MERGE 1
51/* blocks already reserved */
52#define EXT4_MB_HINT_RESERVED 2
53/* metadata is being allocated */
54#define EXT4_MB_HINT_METADATA 4
55/* first blocks in the file */
56#define EXT4_MB_HINT_FIRST 8
57/* search for the best chunk */
58#define EXT4_MB_HINT_BEST 16
59/* data is being allocated */
60#define EXT4_MB_HINT_DATA 32
61/* don't preallocate (for tails) */
62#define EXT4_MB_HINT_NOPREALLOC 64
63/* allocate for locality group */
64#define EXT4_MB_HINT_GROUP_ALLOC 128
65/* allocate goal blocks or none */
66#define EXT4_MB_HINT_GOAL_ONLY 256
67/* goal is meaningful */
68#define EXT4_MB_HINT_TRY_GOAL 512
Mingming Caod2a17632008-07-14 17:52:37 -040069/* blocks already pre-reserved by delayed allocation */
70#define EXT4_MB_DELALLOC_RESERVED 1024
71
Alex Tomasc9de5602008-01-29 00:19:52 -050072
73struct ext4_allocation_request {
74 /* target inode for block we're allocating */
75 struct inode *inode;
76 /* logical block in target inode */
77 ext4_lblk_t logical;
78 /* phys. target (a hint) */
79 ext4_fsblk_t goal;
80 /* the closest logical allocated block to the left */
81 ext4_lblk_t lleft;
82 /* phys. block for ^^^ */
83 ext4_fsblk_t pleft;
84 /* the closest logical allocated block to the right */
85 ext4_lblk_t lright;
86 /* phys. block for ^^^ */
87 ext4_fsblk_t pright;
88 /* how many blocks we want to allocate */
Theodore Ts'o498e5f22008-11-05 00:14:04 -050089 unsigned int len;
Alex Tomasc9de5602008-01-29 00:19:52 -050090 /* flags. see above EXT4_MB_HINT_* */
Theodore Ts'o498e5f22008-11-05 00:14:04 -050091 unsigned int flags;
Alex Tomasc9de5602008-01-29 00:19:52 -050092};
93
Dave Kleikampac27a0e2006-10-11 01:20:50 -070094/*
95 * Special inodes numbers
96 */
Mingming Cao617ba132006-10-11 01:20:53 -070097#define EXT4_BAD_INO 1 /* Bad blocks inode */
98#define EXT4_ROOT_INO 2 /* Root inode */
99#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
100#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
101#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
102#define EXT4_JOURNAL_INO 8 /* Journal inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700103
Mingming Cao617ba132006-10-11 01:20:53 -0700104/* First non-reserved inode for old ext4 filesystems */
105#define EXT4_GOOD_OLD_FIRST_INO 11
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700106
107/*
108 * Maximal count of links to a file
109 */
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400110#define EXT4_LINK_MAX 65000
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700111
112/*
113 * Macro-instructions used to manage several block sizes
114 */
Mingming Cao617ba132006-10-11 01:20:53 -0700115#define EXT4_MIN_BLOCK_SIZE 1024
Takashi Satoafc7cbc2008-01-28 23:58:27 -0500116#define EXT4_MAX_BLOCK_SIZE 65536
117#define EXT4_MIN_BLOCK_LOG_SIZE 10
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700118#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700119# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700120#else
Mingming Cao617ba132006-10-11 01:20:53 -0700121# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700122#endif
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400123#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700124#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700125# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700126#else
Mingming Cao617ba132006-10-11 01:20:53 -0700127# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700128#endif
129#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700130#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
131#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
132#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700133#else
Mingming Cao617ba132006-10-11 01:20:53 -0700134#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
135 EXT4_GOOD_OLD_INODE_SIZE : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700136 (s)->s_inode_size)
Mingming Cao617ba132006-10-11 01:20:53 -0700137#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
138 EXT4_GOOD_OLD_FIRST_INO : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700139 (s)->s_first_ino)
140#endif
Amit Aroraa2df2a62007-07-17 21:42:41 -0400141#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700142
143/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700144 * Structure of a blocks group descriptor
145 */
Mingming Cao617ba132006-10-11 01:20:53 -0700146struct ext4_group_desc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700147{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400148 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400149 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
150 __le32 bg_inode_table_lo; /* Inodes table block */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500151 __le16 bg_free_blocks_count_lo;/* Free blocks count */
152 __le16 bg_free_inodes_count_lo;/* Free inodes count */
153 __le16 bg_used_dirs_count_lo; /* Directories count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400154 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
155 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500156 __le16 bg_itable_unused_lo; /* Unused inodes count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400157 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700158 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
159 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
160 __le32 bg_inode_table_hi; /* Inodes table block MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500161 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
162 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
163 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500164 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
Coly Li91b51a02008-01-28 23:58:27 -0500165 __u32 bg_reserved2[3];
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700166};
167
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400168/*
169 * Structure of a flex block group info
170 */
171
172struct flex_groups {
Theodore Ts'o9f24e422009-03-04 19:09:10 -0500173 atomic_t free_inodes;
174 atomic_t free_blocks;
Theodore Ts'o7d39db12009-03-04 19:31:53 -0500175 atomic_t used_dirs;
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400176};
177
Andreas Dilger717d50e2007-10-16 18:38:25 -0400178#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
179#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
180#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
181
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700182#ifdef __KERNEL__
Christoph Hellwig3dcf5452008-04-29 18:13:32 -0400183#include "ext4_sb.h"
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700184#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700185/*
186 * Macro-instructions used to manage group descriptors
187 */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700188#define EXT4_MIN_DESC_SIZE 32
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700189#define EXT4_MIN_DESC_SIZE_64BIT 64
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700190#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
191#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700192#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700193# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
194# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
195# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
196# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700197#else
Mingming Cao617ba132006-10-11 01:20:53 -0700198# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700199# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
Mingming Cao617ba132006-10-11 01:20:53 -0700200# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700201#endif
202
203/*
204 * Constants relative to the data blocks
205 */
Mingming Cao617ba132006-10-11 01:20:53 -0700206#define EXT4_NDIR_BLOCKS 12
207#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
208#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
209#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
210#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700211
212/*
213 * Inode flags
214 */
Mingming Cao617ba132006-10-11 01:20:53 -0700215#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
216#define EXT4_UNRM_FL 0x00000002 /* Undelete */
217#define EXT4_COMPR_FL 0x00000004 /* Compress file */
218#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
219#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
220#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
221#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
222#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700223/* Reserved for compression usage... */
Mingming Cao617ba132006-10-11 01:20:53 -0700224#define EXT4_DIRTY_FL 0x00000100
225#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
226#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
227#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700228/* End compression flags --- maybe not all used */
Mingming Cao617ba132006-10-11 01:20:53 -0700229#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
230#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
231#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
232#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
233#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
234#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500235#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
Alex Tomasa86c6182006-10-11 01:21:03 -0700236#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
Aneesh Kumar K.V267e4db2008-04-29 08:11:12 -0400237#define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -0500238#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700239
Alex Tomasa86c6182006-10-11 01:21:03 -0700240#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
Aneesh Kumar K.V4db46fc2008-10-08 23:34:06 -0400241#define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700242
Duane Griffin8fa43a82009-02-15 18:57:26 -0500243/* Flags that should be inherited by new inodes from their parent. */
244#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
245 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
246 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
247 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
248 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
249
Duane Griffin2dc6b0d2009-02-15 18:09:20 -0500250/* Flags that are appropriate for regular files (all but dir-specific ones). */
251#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
252
253/* Flags that are appropriate for non-directories/regular files. */
254#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
255
256/* Mask out flags that are inappropriate for the given type of inode. */
257static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
258{
259 if (S_ISDIR(mode))
260 return flags;
261 else if (S_ISREG(mode))
262 return flags & EXT4_REG_FLMASK;
263 else
264 return flags & EXT4_OTHER_FLMASK;
265}
266
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700267/*
268 * Inode dynamic state flags
269 */
Mingming Cao617ba132006-10-11 01:20:53 -0700270#define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
271#define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
272#define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
Kalpak Shah6dd4ee72007-07-18 09:19:57 -0400273#define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
Theodore Ts'o7d8f9f72009-02-24 08:21:14 -0500274#define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700275
276/* Used to pass group descriptor data when online resize is done */
Mingming Cao617ba132006-10-11 01:20:53 -0700277struct ext4_new_group_input {
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400278 __u32 group; /* Group number for this data */
279 __u64 block_bitmap; /* Absolute block number of block bitmap */
280 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
281 __u64 inode_table; /* Absolute block number of inode table start */
282 __u32 blocks_count; /* Total number of blocks in this group */
283 __u16 reserved_blocks; /* Number of reserved blocks in this group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700284 __u16 unused;
285};
286
Mingming Cao617ba132006-10-11 01:20:53 -0700287/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
288struct ext4_new_group_data {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700289 __u32 group;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700290 __u64 block_bitmap;
291 __u64 inode_bitmap;
292 __u64 inode_table;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700293 __u32 blocks_count;
294 __u16 reserved_blocks;
295 __u16 unused;
296 __u32 free_blocks_count;
297};
298
Amit Aroraa2df2a62007-07-17 21:42:41 -0400299/*
300 * Following is used by preallocation code to tell get_blocks() that we
301 * want uninitialzed extents.
302 */
303#define EXT4_CREATE_UNINITIALIZED_EXT 2
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700304
305/*
306 * ioctl commands
307 */
Mingming Cao617ba132006-10-11 01:20:53 -0700308#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
309#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
310#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
311#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
Mingming Cao617ba132006-10-11 01:20:53 -0700312#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
313#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
Jose R. Santose23291b2007-07-18 08:57:06 -0400314#ifdef CONFIG_JBD2_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700315#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700316#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700317#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
318#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400319#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
320#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
321#define EXT4_IOC_MIGRATE _IO('f', 9)
Theodore Ts'occd25062009-02-26 01:04:07 -0500322 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
Theodore Ts'o8eea80d2008-09-13 19:54:35 -0400323 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
Theodore Ts'occd25062009-02-26 01:04:07 -0500324#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700325
326/*
327 * ioctl commands in 32 bit emulation
328 */
Mingming Cao617ba132006-10-11 01:20:53 -0700329#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
330#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
331#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
332#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
333#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
334#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
335#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
Jose R. Santose23291b2007-07-18 08:57:06 -0400336#ifdef CONFIG_JBD2_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700337#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700338#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700339#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
340#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700341
342
343/*
344 * Mount options
345 */
Mingming Cao617ba132006-10-11 01:20:53 -0700346struct ext4_mount_options {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700347 unsigned long s_mount_opt;
348 uid_t s_resuid;
349 gid_t s_resgid;
350 unsigned long s_commit_interval;
Theodore Ts'o30773842009-01-03 20:27:38 -0500351 u32 s_min_batch_time, s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700352#ifdef CONFIG_QUOTA
353 int s_jquota_fmt;
354 char *s_qf_names[MAXQUOTAS];
355#endif
356};
357
358/*
359 * Structure of an inode on the disk
360 */
Mingming Cao617ba132006-10-11 01:20:53 -0700361struct ext4_inode {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700362 __le16 i_mode; /* File mode */
363 __le16 i_uid; /* Low 16 bits of Owner Uid */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500364 __le32 i_size_lo; /* Size in bytes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700365 __le32 i_atime; /* Access time */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400366 __le32 i_ctime; /* Inode Change time */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700367 __le32 i_mtime; /* Modification time */
368 __le32 i_dtime; /* Deletion Time */
369 __le16 i_gid; /* Low 16 bits of Group Id */
370 __le16 i_links_count; /* Links count */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500371 __le32 i_blocks_lo; /* Blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700372 __le32 i_flags; /* File flags */
373 union {
374 struct {
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500375 __le32 l_i_version;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700376 } linux1;
377 struct {
378 __u32 h_i_translator;
379 } hurd1;
380 struct {
381 __u32 m_i_reserved1;
382 } masix1;
383 } osd1; /* OS dependent 1 */
Mingming Cao617ba132006-10-11 01:20:53 -0700384 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700385 __le32 i_generation; /* File version (for NFS) */
Aneesh Kumar K.V7973c0c2008-01-28 23:58:27 -0500386 __le32 i_file_acl_lo; /* File ACL */
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -0500387 __le32 i_size_high;
Coly Lif077d0d2007-10-16 18:38:25 -0400388 __le32 i_obso_faddr; /* Obsoleted fragment address */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700389 union {
390 struct {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500391 __le16 l_i_blocks_high; /* were l_i_reserved1 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700392 __le16 l_i_file_acl_high;
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400393 __le16 l_i_uid_high; /* these 2 fields */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700394 __le16 l_i_gid_high; /* were reserved2[0] */
395 __u32 l_i_reserved2;
396 } linux2;
397 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400398 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700399 __u16 h_i_mode_high;
400 __u16 h_i_uid_high;
401 __u16 h_i_gid_high;
402 __u32 h_i_author;
403 } hurd2;
404 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400405 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700406 __le16 m_i_file_acl_high;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700407 __u32 m_i_reserved2[2];
408 } masix2;
409 } osd2; /* OS dependent 2 */
410 __le16 i_extra_isize;
411 __le16 i_pad1;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400412 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
413 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
414 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
415 __le32 i_crtime; /* File Creation time */
416 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500417 __le32 i_version_hi; /* high 32 bits for 64-bit version */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700418};
419
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700420
Kalpak Shahef7f3832007-07-18 09:15:20 -0400421#define EXT4_EPOCH_BITS 2
422#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
423#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
424
425/*
426 * Extended fields will fit into an inode if the filesystem was formatted
427 * with large inodes (-I 256 or larger) and there are not currently any EAs
428 * consuming all of the available space. For new inodes we always reserve
429 * enough space for the kernel's known extended fields, but for inodes
430 * created with an old kernel this might not have been the case. None of
431 * the extended inode fields is critical for correct filesystem operation.
432 * This macro checks if a certain field fits in the inode. Note that
433 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
434 */
435#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
436 ((offsetof(typeof(*ext4_inode), field) + \
437 sizeof((ext4_inode)->field)) \
438 <= (EXT4_GOOD_OLD_INODE_SIZE + \
439 (einode)->i_extra_isize)) \
440
441static inline __le32 ext4_encode_extra_time(struct timespec *time)
442{
443 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
444 time->tv_sec >> 32 : 0) |
445 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
446}
447
448static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
449{
450 if (sizeof(time->tv_sec) > 4)
451 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
452 << 32;
453 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
454}
455
456#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
457do { \
458 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
459 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
460 (raw_inode)->xtime ## _extra = \
461 ext4_encode_extra_time(&(inode)->xtime); \
462} while (0)
463
464#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
465do { \
466 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
467 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
468 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
469 (raw_inode)->xtime ## _extra = \
470 ext4_encode_extra_time(&(einode)->xtime); \
471} while (0)
472
473#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
474do { \
475 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
476 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
477 ext4_decode_extra_time(&(inode)->xtime, \
478 raw_inode->xtime ## _extra); \
479} while (0)
480
481#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
482do { \
483 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
484 (einode)->xtime.tv_sec = \
485 (signed)le32_to_cpu((raw_inode)->xtime); \
486 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
487 ext4_decode_extra_time(&(einode)->xtime, \
488 raw_inode->xtime ## _extra); \
489} while (0)
490
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500491#define i_disk_version osd1.linux1.l_i_version
492
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700493#if defined(__KERNEL__) || defined(__linux__)
494#define i_reserved1 osd1.linux1.l_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700495#define i_file_acl_high osd2.linux2.l_i_file_acl_high
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500496#define i_blocks_high osd2.linux2.l_i_blocks_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700497#define i_uid_low i_uid
498#define i_gid_low i_gid
499#define i_uid_high osd2.linux2.l_i_uid_high
500#define i_gid_high osd2.linux2.l_i_gid_high
501#define i_reserved2 osd2.linux2.l_i_reserved2
502
503#elif defined(__GNU__)
504
505#define i_translator osd1.hurd1.h_i_translator
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700506#define i_uid_high osd2.hurd2.h_i_uid_high
507#define i_gid_high osd2.hurd2.h_i_gid_high
508#define i_author osd2.hurd2.h_i_author
509
510#elif defined(__masix__)
511
512#define i_reserved1 osd1.masix1.m_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700513#define i_file_acl_high osd2.masix2.m_i_file_acl_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700514#define i_reserved2 osd2.masix2.m_i_reserved2
515
516#endif /* defined(__KERNEL__) || defined(__linux__) */
517
518/*
519 * File system states
520 */
Mingming Cao617ba132006-10-11 01:20:53 -0700521#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
522#define EXT4_ERROR_FS 0x0002 /* Errors detected */
523#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700524
525/*
Theodore Tso469108f2008-02-10 01:11:44 -0500526 * Misc. filesystem flags
527 */
528#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
529#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
530#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
531
532/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700533 * Mount flags
534 */
Mingming Cao617ba132006-10-11 01:20:53 -0700535#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
536#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
537#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
538#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
539#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
540#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
541#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
542#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
543#define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
544#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
545#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
546#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
547#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
548#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
549#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
550#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
551#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
Theodore Ts'oafd46722009-03-16 23:12:23 -0400552#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
Mingming Cao617ba132006-10-11 01:20:53 -0700553#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
554#define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
555#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
556#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
557#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
Girish Shilamkar818d2762008-01-28 23:58:27 -0500558#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
559#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500560#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
Alex Tomas64769242008-07-11 19:27:31 -0400561#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400562#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
563
Mingming Cao617ba132006-10-11 01:20:53 -0700564/* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700565#ifndef _LINUX_EXT2_FS_H
Mingming Cao617ba132006-10-11 01:20:53 -0700566#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
567#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
568#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
569 EXT4_MOUNT_##opt)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700570#else
Mingming Cao617ba132006-10-11 01:20:53 -0700571#define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
572#define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
573#define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700574#endif
575
Mingming Cao617ba132006-10-11 01:20:53 -0700576#define ext4_set_bit ext2_set_bit
577#define ext4_set_bit_atomic ext2_set_bit_atomic
578#define ext4_clear_bit ext2_clear_bit
579#define ext4_clear_bit_atomic ext2_clear_bit_atomic
580#define ext4_test_bit ext2_test_bit
581#define ext4_find_first_zero_bit ext2_find_first_zero_bit
582#define ext4_find_next_zero_bit ext2_find_next_zero_bit
Aneesh Kumar K.Vaa02ad62008-01-28 23:58:27 -0500583#define ext4_find_next_bit ext2_find_next_bit
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700584
585/*
586 * Maximal mount counts between two filesystem checks
587 */
Mingming Cao617ba132006-10-11 01:20:53 -0700588#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
589#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700590
591/*
592 * Behaviour when detecting errors
593 */
Mingming Cao617ba132006-10-11 01:20:53 -0700594#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
595#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
596#define EXT4_ERRORS_PANIC 3 /* Panic */
597#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700598
599/*
600 * Structure of the super block
601 */
Mingming Cao617ba132006-10-11 01:20:53 -0700602struct ext4_super_block {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700603/*00*/ __le32 s_inodes_count; /* Inodes count */
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -0400604 __le32 s_blocks_count_lo; /* Blocks count */
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -0400605 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
606 __le32 s_free_blocks_count_lo; /* Free blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700607/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
608 __le32 s_first_data_block; /* First Data Block */
609 __le32 s_log_block_size; /* Block size */
Coly Lif077d0d2007-10-16 18:38:25 -0400610 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700611/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
Coly Lif077d0d2007-10-16 18:38:25 -0400612 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700613 __le32 s_inodes_per_group; /* # Inodes per group */
614 __le32 s_mtime; /* Mount time */
615/*30*/ __le32 s_wtime; /* Write time */
616 __le16 s_mnt_count; /* Mount count */
617 __le16 s_max_mnt_count; /* Maximal mount count */
618 __le16 s_magic; /* Magic signature */
619 __le16 s_state; /* File system state */
620 __le16 s_errors; /* Behaviour when detecting errors */
621 __le16 s_minor_rev_level; /* minor revision level */
622/*40*/ __le32 s_lastcheck; /* time of last check */
623 __le32 s_checkinterval; /* max. time between checks */
624 __le32 s_creator_os; /* OS */
625 __le32 s_rev_level; /* Revision level */
626/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
627 __le16 s_def_resgid; /* Default gid for reserved blocks */
628 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700629 * These fields are for EXT4_DYNAMIC_REV superblocks only.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700630 *
631 * Note: the difference between the compatible feature set and
632 * the incompatible feature set is that if there is a bit set
633 * in the incompatible feature set that the kernel doesn't
634 * know about, it should refuse to mount the filesystem.
635 *
636 * e2fsck's requirements are more strict; if it doesn't know
637 * about a feature in either the compatible or incompatible
638 * feature set, it must abort and not try to meddle with
639 * things it doesn't understand...
640 */
641 __le32 s_first_ino; /* First non-reserved inode */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700642 __le16 s_inode_size; /* size of inode structure */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700643 __le16 s_block_group_nr; /* block group # of this superblock */
644 __le32 s_feature_compat; /* compatible feature set */
645/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
646 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
647/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
648/*78*/ char s_volume_name[16]; /* volume name */
649/*88*/ char s_last_mounted[64]; /* directory where last mounted */
650/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
651 /*
652 * Performance hints. Directory preallocation should only
Mingming Cao617ba132006-10-11 01:20:53 -0700653 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700654 */
655 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
656 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
657 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
658 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700659 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700660 */
661/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
662/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
663 __le32 s_journal_dev; /* device number of journal file */
664 __le32 s_last_orphan; /* start of list of inodes to delete */
665 __le32 s_hash_seed[4]; /* HTREE hash seed */
666 __u8 s_def_hash_version; /* Default hash version to use */
667 __u8 s_reserved_char_pad;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700668 __le16 s_desc_size; /* size of group descriptor */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700669/*100*/ __le32 s_default_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700670 __le32 s_first_meta_bg; /* First metablock block group */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700671 __le32 s_mkfs_time; /* When the filesystem was created */
672 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
673 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
674/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
675 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
676 __le32 s_free_blocks_count_hi; /* Free blocks count */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -0400677 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
678 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
679 __le32 s_flags; /* Miscellaneous flags */
680 __le16 s_raid_stride; /* RAID stride */
681 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
682 __le64 s_mmp_block; /* Block for multi-mount protection */
683 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400684 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
685 __u8 s_reserved_char_pad2;
686 __le16 s_reserved_pad;
Theodore Ts'oafc32f72009-02-28 19:39:58 -0500687 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
688 __u32 s_reserved[160]; /* Padding to the end of the block */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700689};
690
691#ifdef __KERNEL__
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400692static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700693{
694 return sb->s_fs_info;
695}
Mingming Cao617ba132006-10-11 01:20:53 -0700696static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700697{
Mingming Cao617ba132006-10-11 01:20:53 -0700698 return container_of(inode, struct ext4_inode_info, vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700699}
700
Kalpak Shahef7f3832007-07-18 09:15:20 -0400701static inline struct timespec ext4_current_time(struct inode *inode)
702{
703 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
704 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
705}
706
707
Mingming Cao617ba132006-10-11 01:20:53 -0700708static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700709{
Mingming Cao617ba132006-10-11 01:20:53 -0700710 return ino == EXT4_ROOT_INO ||
711 ino == EXT4_JOURNAL_INO ||
712 ino == EXT4_RESIZE_INO ||
713 (ino >= EXT4_FIRST_INO(sb) &&
714 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700715}
716#else
Mingming Cao617ba132006-10-11 01:20:53 -0700717/* Assume that user mode programs are passing in an ext4fs superblock, not
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700718 * a kernel struct super_block. This will allow us to call the feature-test
719 * macros from user land. */
Mingming Cao617ba132006-10-11 01:20:53 -0700720#define EXT4_SB(sb) (sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700721#endif
722
Mingming Cao617ba132006-10-11 01:20:53 -0700723#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700724
725/*
726 * Codes for operating systems
727 */
Mingming Cao617ba132006-10-11 01:20:53 -0700728#define EXT4_OS_LINUX 0
729#define EXT4_OS_HURD 1
730#define EXT4_OS_MASIX 2
731#define EXT4_OS_FREEBSD 3
732#define EXT4_OS_LITES 4
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700733
734/*
735 * Revision levels
736 */
Mingming Cao617ba132006-10-11 01:20:53 -0700737#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
738#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700739
Mingming Cao617ba132006-10-11 01:20:53 -0700740#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
741#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700742
Mingming Cao617ba132006-10-11 01:20:53 -0700743#define EXT4_GOOD_OLD_INODE_SIZE 128
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700744
745/*
746 * Feature set definitions
747 */
748
Mingming Cao617ba132006-10-11 01:20:53 -0700749#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -0500750 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -0700751#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -0500752 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -0700753#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -0500754 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
Mingming Cao617ba132006-10-11 01:20:53 -0700755#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
756 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
757#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
758 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
759#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
760 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
761#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
762 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
763#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
764 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
765#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
766 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700767
Mingming Cao617ba132006-10-11 01:20:53 -0700768#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
769#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
770#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
771#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
772#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
773#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700774
Mingming Cao617ba132006-10-11 01:20:53 -0700775#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
776#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
777#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500778#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
Andreas Dilger717d50e2007-10-16 18:38:25 -0400779#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400780#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
Kalpak Shahef7f3832007-07-18 09:15:20 -0400781#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700782
Mingming Cao617ba132006-10-11 01:20:53 -0700783#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
784#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
785#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
786#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
787#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
Alex Tomasa86c6182006-10-11 01:21:03 -0700788#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700789#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500790#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
Jose R. Santosce421582007-10-16 18:38:25 -0400791#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700792
Mingming Cao617ba132006-10-11 01:20:53 -0700793#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
794#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
795 EXT4_FEATURE_INCOMPAT_RECOVER| \
Alex Tomasa86c6182006-10-11 01:21:03 -0700796 EXT4_FEATURE_INCOMPAT_META_BG| \
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700797 EXT4_FEATURE_INCOMPAT_EXTENTS| \
Jose R. Santosce421582007-10-16 18:38:25 -0400798 EXT4_FEATURE_INCOMPAT_64BIT| \
799 EXT4_FEATURE_INCOMPAT_FLEX_BG)
Mingming Cao617ba132006-10-11 01:20:53 -0700800#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
801 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
Andreas Dilger717d50e2007-10-16 18:38:25 -0400802 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400803 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
Kalpak Shahef7f3832007-07-18 09:15:20 -0400804 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -0500805 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
806 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700807
808/*
809 * Default values for user and/or group using reserved blocks
810 */
Mingming Cao617ba132006-10-11 01:20:53 -0700811#define EXT4_DEF_RESUID 0
812#define EXT4_DEF_RESGID 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700813
Theodore Ts'o240799c2008-10-09 23:53:47 -0400814#define EXT4_DEF_INODE_READAHEAD_BLKS 32
815
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700816/*
817 * Default mount options
818 */
Mingming Cao617ba132006-10-11 01:20:53 -0700819#define EXT4_DEFM_DEBUG 0x0001
820#define EXT4_DEFM_BSDGROUPS 0x0002
821#define EXT4_DEFM_XATTR_USER 0x0004
822#define EXT4_DEFM_ACL 0x0008
823#define EXT4_DEFM_UID16 0x0010
824#define EXT4_DEFM_JMODE 0x0060
825#define EXT4_DEFM_JMODE_DATA 0x0020
826#define EXT4_DEFM_JMODE_ORDERED 0x0040
827#define EXT4_DEFM_JMODE_WBACK 0x0060
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700828
829/*
Theodore Ts'o30773842009-01-03 20:27:38 -0500830 * Default journal batch times
831 */
832#define EXT4_DEF_MIN_BATCH_TIME 0
833#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
834
835/*
Theodore Ts'oa4912122009-03-12 12:18:34 -0400836 * Minimum number of groups in a flexgroup before we separate out
837 * directories into the first block group of a flexgroup
838 */
839#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
840
841/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700842 * Structure of a directory entry
843 */
Mingming Cao617ba132006-10-11 01:20:53 -0700844#define EXT4_NAME_LEN 255
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700845
Mingming Cao617ba132006-10-11 01:20:53 -0700846struct ext4_dir_entry {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700847 __le32 inode; /* Inode number */
848 __le16 rec_len; /* Directory entry length */
849 __le16 name_len; /* Name length */
Mingming Cao617ba132006-10-11 01:20:53 -0700850 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700851};
852
853/*
Mingming Cao617ba132006-10-11 01:20:53 -0700854 * The new version of the directory entry. Since EXT4 structures are
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700855 * stored in intel byte order, and the name_len field could never be
856 * bigger than 255 chars, it's safe to reclaim the extra byte for the
857 * file_type field.
858 */
Mingming Cao617ba132006-10-11 01:20:53 -0700859struct ext4_dir_entry_2 {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700860 __le32 inode; /* Inode number */
861 __le16 rec_len; /* Directory entry length */
862 __u8 name_len; /* Name length */
863 __u8 file_type;
Mingming Cao617ba132006-10-11 01:20:53 -0700864 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700865};
866
867/*
Mingming Cao617ba132006-10-11 01:20:53 -0700868 * Ext4 directory file types. Only the low 3 bits are used. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700869 * other bits are reserved for now.
870 */
Mingming Cao617ba132006-10-11 01:20:53 -0700871#define EXT4_FT_UNKNOWN 0
872#define EXT4_FT_REG_FILE 1
873#define EXT4_FT_DIR 2
874#define EXT4_FT_CHRDEV 3
875#define EXT4_FT_BLKDEV 4
876#define EXT4_FT_FIFO 5
877#define EXT4_FT_SOCK 6
878#define EXT4_FT_SYMLINK 7
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700879
Mingming Cao617ba132006-10-11 01:20:53 -0700880#define EXT4_FT_MAX 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700881
882/*
Mingming Cao617ba132006-10-11 01:20:53 -0700883 * EXT4_DIR_PAD defines the directory entries boundaries
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700884 *
885 * NOTE: It must be a multiple of 4
886 */
Mingming Cao617ba132006-10-11 01:20:53 -0700887#define EXT4_DIR_PAD 4
888#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
889#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
890 ~EXT4_DIR_ROUND)
Jan Karaa72d7f82008-01-28 23:58:27 -0500891#define EXT4_MAX_REC_LEN ((1<<16)-1)
892
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700893/*
894 * Hash Tree Directory indexing
895 * (c) Daniel Phillips, 2001
896 */
897
Eric Sandeen4074fe32007-10-16 18:38:25 -0400898#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
899 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
Mingming Cao617ba132006-10-11 01:20:53 -0700900 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
901#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
902#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700903
904/* Legal values for the dx_root hash_version field: */
905
906#define DX_HASH_LEGACY 0
907#define DX_HASH_HALF_MD4 1
908#define DX_HASH_TEA 2
Theodore Ts'of99b2582008-10-28 13:21:44 -0400909#define DX_HASH_LEGACY_UNSIGNED 3
910#define DX_HASH_HALF_MD4_UNSIGNED 4
911#define DX_HASH_TEA_UNSIGNED 5
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700912
913#ifdef __KERNEL__
914
915/* hash info structure used by the directory hash */
916struct dx_hash_info
917{
918 u32 hash;
919 u32 minor_hash;
920 int hash_version;
921 u32 *seed;
922};
923
Mingming Cao617ba132006-10-11 01:20:53 -0700924#define EXT4_HTREE_EOF 0x7fffffff
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700925
926/*
Mingming Cao617ba132006-10-11 01:20:53 -0700927 * Control parameters used by ext4_htree_next_block
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700928 */
929#define HASH_NB_ALWAYS 1
930
931
932/*
933 * Describe an inode's exact location on disk and in memory
934 */
Mingming Cao617ba132006-10-11 01:20:53 -0700935struct ext4_iloc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700936{
937 struct buffer_head *bh;
938 unsigned long offset;
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500939 ext4_group_t block_group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700940};
941
Mingming Cao617ba132006-10-11 01:20:53 -0700942static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700943{
Mingming Cao617ba132006-10-11 01:20:53 -0700944 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700945}
946
947/*
948 * This structure is stuffed into the struct file's private_data field
949 * for directories. It is where we put information so that we can do
950 * readdir operations in hash tree order.
951 */
952struct dir_private_info {
953 struct rb_root root;
954 struct rb_node *curr_node;
955 struct fname *extra_fname;
956 loff_t last_pos;
957 __u32 curr_hash;
958 __u32 curr_minor_hash;
959 __u32 next_hash;
960};
961
962/* calculate the first block number of the group */
Mingming Cao617ba132006-10-11 01:20:53 -0700963static inline ext4_fsblk_t
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500964ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700965{
Mingming Cao617ba132006-10-11 01:20:53 -0700966 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
967 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700968}
969
970/*
971 * Special error return code only used by dx_probe() and its callers.
972 */
973#define ERR_BAD_DX_DIR -75000
974
Andrew Morton72b64b52006-10-11 01:21:18 -0700975void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
Theodore Ts'oa9df9a42009-01-05 22:18:16 -0500976 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
Mingming Cao3a5b2ec2006-10-11 01:21:05 -0700977
Theodore Ts'o9f6200b2008-09-23 09:18:24 -0400978extern struct proc_dir_entry *ext4_proc_root;
979
Mingming Cao3a5b2ec2006-10-11 01:21:05 -0700980/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700981 * Function prototypes
982 */
983
984/*
985 * Ok, these declarations are also in <linux/kernel.h> but none of the
Mingming Cao617ba132006-10-11 01:20:53 -0700986 * ext4 source programs needs to include it so they are duplicated here.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700987 */
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400988# define NORET_TYPE /**/
989# define ATTRIB_NORET __attribute__((noreturn))
990# define NORET_AND noreturn,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700991
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500992/* bitmap.c */
993extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
994
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700995/* balloc.c */
Mingming Cao3a5b2ec2006-10-11 01:21:05 -0700996extern unsigned int ext4_block_group(struct super_block *sb,
997 ext4_fsblk_t blocknr);
998extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
999 ext4_fsblk_t blocknr);
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001000extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1001extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1002 ext4_group_t group);
Aneesh Kumar K.V7061eba2008-07-11 19:27:31 -04001003extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
Mingming Cao617ba132006-10-11 01:20:53 -07001004 ext4_fsblk_t goal, unsigned long *count, int *errp);
Aneesh Kumar K.V5c791612008-10-08 23:12:24 -04001005extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
Eric Sandeen8c3bf8a02008-10-28 00:08:12 -04001006extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001007extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
Alex Tomasc9de5602008-01-29 00:19:52 -05001008 ext4_fsblk_t block, unsigned long count, int metadata);
Aneesh Kumar K.Ve21675d2009-01-05 21:36:02 -05001009extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1010 ext4_fsblk_t block, unsigned long count);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001011extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1012extern void ext4_check_blocks_bitmap(struct super_block *);
Mingming Cao617ba132006-10-11 01:20:53 -07001013extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001014 ext4_group_t block_group,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001015 struct buffer_head ** bh);
Mingming Cao617ba132006-10-11 01:20:53 -07001016extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001017
1018/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001019extern int ext4_check_dir_entry(const char *, struct inode *,
1020 struct ext4_dir_entry_2 *,
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001021 struct buffer_head *, unsigned int);
Mingming Cao617ba132006-10-11 01:20:53 -07001022extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001023 __u32 minor_hash,
Mingming Cao617ba132006-10-11 01:20:53 -07001024 struct ext4_dir_entry_2 *dirent);
1025extern void ext4_htree_free_dir_info(struct dir_private_info *p);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001026
1027/* fsync.c */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001028extern int ext4_sync_file(struct file *, struct dentry *, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001029
1030/* hash.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001031extern int ext4fs_dirhash(const char *name, int len, struct
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001032 dx_hash_info *hinfo);
1033
1034/* ialloc.c */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001035extern struct inode * ext4_new_inode(handle_t *, struct inode *, int);
1036extern void ext4_free_inode(handle_t *, struct inode *);
1037extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1038extern unsigned long ext4_count_free_inodes(struct super_block *);
1039extern unsigned long ext4_count_dirs(struct super_block *);
1040extern void ext4_check_inodes_bitmap(struct super_block *);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001041
Alex Tomasc9de5602008-01-29 00:19:52 -05001042/* mballoc.c */
1043extern long ext4_mb_stats;
1044extern long ext4_mb_max_to_scan;
1045extern int ext4_mb_init(struct super_block *, int);
1046extern int ext4_mb_release(struct super_block *);
1047extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1048 struct ext4_allocation_request *, int *);
1049extern int ext4_mb_reserve_blocks(struct super_block *, int);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04001050extern void ext4_discard_preallocations(struct inode *);
Alex Tomasc9de5602008-01-29 00:19:52 -05001051extern int __init init_ext4_mballoc(void);
1052extern void exit_ext4_mballoc(void);
1053extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1054 unsigned long, unsigned long, int, unsigned long *);
Aneesh Kumar K.V920313a2009-01-05 21:36:19 -05001055extern int ext4_mb_add_groupinfo(struct super_block *sb,
Frederic Bohe5f21b0e2008-07-11 19:27:31 -04001056 ext4_group_t i, struct ext4_group_desc *desc);
1057extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
1058 ext4_grpblk_t add);
Aneesh Kumar K.V920313a2009-01-05 21:36:19 -05001059extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1060extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1061 ext4_group_t, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001062/* inode.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001063int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1064 struct buffer_head *bh, ext4_fsblk_t blocknr);
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001065struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1066 ext4_lblk_t, int, int *);
1067struct buffer_head *ext4_bread(handle_t *, struct inode *,
1068 ext4_lblk_t, int, int *);
Eric Sandeen6873fa02008-10-07 00:46:36 -04001069int ext4_get_block(struct inode *inode, sector_t iblock,
1070 struct buffer_head *bh_result, int create);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001071
David Howells1d1fe1e2008-02-07 00:15:37 -08001072extern struct inode *ext4_iget(struct super_block *, unsigned long);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001073extern int ext4_write_inode(struct inode *, int);
1074extern int ext4_setattr(struct dentry *, struct iattr *);
Mingming Cao3e3398a2008-07-11 19:27:31 -04001075extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1076 struct kstat *stat);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001077extern void ext4_delete_inode(struct inode *);
1078extern int ext4_sync_inode(handle_t *, struct inode *);
Mingming Cao617ba132006-10-11 01:20:53 -07001079extern void ext4_dirty_inode(struct inode *);
1080extern int ext4_change_inode_journal_flag(struct inode *, int);
1081extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
Duane Griffin91ef4ca2008-07-11 19:27:31 -04001082extern int ext4_can_truncate(struct inode *inode);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001083extern void ext4_truncate(struct inode *);
Mingming Cao617ba132006-10-11 01:20:53 -07001084extern void ext4_set_inode_flags(struct inode *);
Jan Karaff9ddf72007-07-18 09:24:20 -04001085extern void ext4_get_inode_flags(struct ext4_inode_info *);
Theodore Ts'occd25062009-02-26 01:04:07 -05001086extern int ext4_alloc_da_blocks(struct inode *inode);
Mingming Cao617ba132006-10-11 01:20:53 -07001087extern void ext4_set_aops(struct inode *inode);
Alex Tomasa86c6182006-10-11 01:21:03 -07001088extern int ext4_writepage_trans_blocks(struct inode *);
Mingming Caoa02908f2008-08-19 22:16:07 -04001089extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
Mingming Caof3bd1f32008-08-19 22:16:03 -04001090extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
Jan Karacf108bc2008-07-11 19:27:31 -04001091extern int ext4_block_truncate_page(handle_t *handle,
Alex Tomasa86c6182006-10-11 01:21:03 -07001092 struct address_space *mapping, loff_t from);
Nick Pigginc2ec1752009-03-31 15:23:21 -07001093extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
Mingming Cao60e58e02009-01-22 18:13:05 +01001094extern qsize_t ext4_get_reserved_space(struct inode *inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001095
1096/* ioctl.c */
Andi Kleen5cdd7b22008-04-29 22:03:54 -04001097extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001098extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001099
Aneesh Kumar K.Vc14c6fd2008-01-28 23:58:26 -05001100/* migrate.c */
Aneesh Kumar K.V2a43a872008-09-13 12:52:26 -04001101extern int ext4_ext_migrate(struct inode *);
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001102
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001103/* namei.c */
Wei Yongjun3d0518f2009-02-14 23:01:36 -05001104extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1105extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
Mingming Cao617ba132006-10-11 01:20:53 -07001106extern int ext4_orphan_add(handle_t *, struct inode *);
1107extern int ext4_orphan_del(handle_t *, struct inode *);
1108extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001109 __u32 start_minor_hash, __u32 *next_hash);
1110
1111/* resize.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001112extern int ext4_group_add(struct super_block *sb,
1113 struct ext4_new_group_data *input);
1114extern int ext4_group_extend(struct super_block *sb,
1115 struct ext4_super_block *es,
1116 ext4_fsblk_t n_blocks_count);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001117
1118/* super.c */
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001119extern void ext4_error(struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001120 __attribute__ ((format (printf, 3, 4)));
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001121extern void __ext4_std_error(struct super_block *, const char *, int);
1122extern void ext4_abort(struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001123 __attribute__ ((format (printf, 3, 4)));
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001124extern void ext4_warning(struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001125 __attribute__ ((format (printf, 3, 4)));
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001126extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1127 const char *, const char *, ...)
1128 __attribute__ ((format (printf, 4, 5)));
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001129extern void ext4_update_dynamic_rev(struct super_block *sb);
Aneesh Kumar K.V99e6f822008-01-28 23:58:27 -05001130extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1131 __u32 compat);
1132extern int ext4_update_rocompat_feature(handle_t *handle,
1133 struct super_block *sb, __u32 rocompat);
1134extern int ext4_update_incompat_feature(handle_t *handle,
1135 struct super_block *sb, __u32 incompat);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001136extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1137 struct ext4_group_desc *bg);
1138extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1139 struct ext4_group_desc *bg);
1140extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1141 struct ext4_group_desc *bg);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05001142extern __u32 ext4_free_blks_count(struct super_block *sb,
1143 struct ext4_group_desc *bg);
1144extern __u32 ext4_free_inodes_count(struct super_block *sb,
1145 struct ext4_group_desc *bg);
1146extern __u32 ext4_used_dirs_count(struct super_block *sb,
1147 struct ext4_group_desc *bg);
1148extern __u32 ext4_itable_unused_count(struct super_block *sb,
1149 struct ext4_group_desc *bg);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001150extern void ext4_block_bitmap_set(struct super_block *sb,
1151 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1152extern void ext4_inode_bitmap_set(struct super_block *sb,
1153 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1154extern void ext4_inode_table_set(struct super_block *sb,
1155 struct ext4_group_desc *bg, ext4_fsblk_t blk);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05001156extern void ext4_free_blks_set(struct super_block *sb,
1157 struct ext4_group_desc *bg, __u32 count);
1158extern void ext4_free_inodes_set(struct super_block *sb,
1159 struct ext4_group_desc *bg, __u32 count);
1160extern void ext4_used_dirs_set(struct super_block *sb,
1161 struct ext4_group_desc *bg, __u32 count);
1162extern void ext4_itable_unused_set(struct super_block *sb,
1163 struct ext4_group_desc *bg, __u32 count);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001164
1165static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1166{
1167 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001168 le32_to_cpu(es->s_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001169}
1170
1171static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1172{
1173 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001174 le32_to_cpu(es->s_r_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001175}
1176
1177static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1178{
1179 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001180 le32_to_cpu(es->s_free_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001181}
1182
1183static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1184 ext4_fsblk_t blk)
1185{
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001186 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001187 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1188}
1189
1190static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1191 ext4_fsblk_t blk)
1192{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001193 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001194 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1195}
1196
1197static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1198 ext4_fsblk_t blk)
1199{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001200 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001201 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1202}
1203
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001204static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1205{
Theodore Ts'o06a279d2009-01-17 18:41:37 -05001206 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1207 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1208 le32_to_cpu(raw_inode->i_size_lo);
1209 else
1210 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001211}
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001212
Aneesh Kumar K.Va48380f2008-01-28 23:58:27 -05001213static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1214{
1215 raw_inode->i_size_lo = cpu_to_le32(i_size);
1216 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1217}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001218
Alex Tomasc9de5602008-01-29 00:19:52 -05001219static inline
1220struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001221 ext4_group_t group)
Alex Tomasc9de5602008-01-29 00:19:52 -05001222{
1223 struct ext4_group_info ***grp_info;
1224 long indexv, indexh;
1225 grp_info = EXT4_SB(sb)->s_group_info;
1226 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1227 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1228 return grp_info[indexv][indexh];
1229}
1230
1231
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001232static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1233 ext4_group_t block_group)
1234{
1235 return block_group >> sbi->s_log_groups_per_flex;
1236}
1237
1238static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1239{
1240 return 1 << sbi->s_log_groups_per_flex;
1241}
1242
Mingming Cao617ba132006-10-11 01:20:53 -07001243#define ext4_std_error(sb, errno) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001244do { \
1245 if ((errno)) \
Stoyan Gaydarov4db9c542008-07-13 21:03:29 -04001246 __ext4_std_error((sb), __func__, (errno)); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001247} while (0)
1248
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04001249#ifdef CONFIG_SMP
Eric Dumazet179f7eb2009-01-06 14:41:04 -08001250/* Each CPU can accumulate percpu_counter_batch blocks in their local
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04001251 * counters. So we need to make sure we have free blocks more
Eric Dumazet179f7eb2009-01-06 14:41:04 -08001252 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04001253 */
Eric Dumazet179f7eb2009-01-06 14:41:04 -08001254#define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04001255#else
1256#define EXT4_FREEBLOCKS_WATERMARK 0
1257#endif
1258
Aneesh Kumar K.Vcf17fea2008-09-13 13:06:18 -04001259static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1260{
1261 /*
1262 * XXX: replace with spinlock if seen contended -bzzz
1263 */
1264 down_write(&EXT4_I(inode)->i_data_sem);
1265 if (newsize > EXT4_I(inode)->i_disksize)
1266 EXT4_I(inode)->i_disksize = newsize;
1267 up_write(&EXT4_I(inode)->i_data_sem);
1268 return ;
1269}
Aneesh Kumar K.Va30d542a2008-10-09 10:56:23 -04001270
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05001271struct ext4_group_info {
1272 unsigned long bb_state;
1273 struct rb_root bb_free_root;
1274 unsigned short bb_first_free;
1275 unsigned short bb_free;
1276 unsigned short bb_fragments;
1277 struct list_head bb_prealloc_list;
1278#ifdef DOUBLE_CHECK
1279 void *bb_bitmap;
1280#endif
1281 struct rw_semaphore alloc_sem;
1282 unsigned short bb_counters[];
1283};
1284
1285#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1286#define EXT4_GROUP_INFO_LOCKED_BIT 1
1287
1288#define EXT4_MB_GRP_NEED_INIT(grp) \
1289 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1290
1291static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1292{
1293 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1294
1295 bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
1296}
1297
1298static inline void ext4_unlock_group(struct super_block *sb,
1299 ext4_group_t group)
1300{
1301 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1302
1303 bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state));
1304}
1305
1306static inline int ext4_is_group_locked(struct super_block *sb,
1307 ext4_group_t group)
1308{
1309 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group);
1310
1311 return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT,
1312 &(grinfo->bb_state));
1313}
1314
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001315/*
1316 * Inodes and files operations
1317 */
1318
1319/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001320extern const struct file_operations ext4_dir_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001321
1322/* file.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001323extern const struct inode_operations ext4_file_inode_operations;
Mingming Cao617ba132006-10-11 01:20:53 -07001324extern const struct file_operations ext4_file_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001325
1326/* namei.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001327extern const struct inode_operations ext4_dir_inode_operations;
1328extern const struct inode_operations ext4_special_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001329
1330/* symlink.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001331extern const struct inode_operations ext4_symlink_inode_operations;
1332extern const struct inode_operations ext4_fast_symlink_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001333
Alex Tomasa86c6182006-10-11 01:21:03 -07001334/* extents.c */
1335extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1336extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
Mingming Caoa02908f2008-08-19 22:16:07 -04001337extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1338 int chunk);
Alex Tomasa86c6182006-10-11 01:21:03 -07001339extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001340 ext4_lblk_t iblock, unsigned int max_blocks,
1341 struct buffer_head *bh_result,
1342 int create, int extend_disksize);
Jan Karacf108bc2008-07-11 19:27:31 -04001343extern void ext4_ext_truncate(struct inode *);
Alex Tomasa86c6182006-10-11 01:21:03 -07001344extern void ext4_ext_init(struct super_block *);
1345extern void ext4_ext_release(struct super_block *);
Amit Aroraa2df2a62007-07-17 21:42:41 -04001346extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1347 loff_t len);
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -05001348extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
Theodore Ts'o498e5f22008-11-05 00:14:04 -05001349 sector_t block, unsigned int max_blocks,
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -05001350 struct buffer_head *bh, int create,
Mingming Caod2a17632008-07-14 17:52:37 -04001351 int extend_disksize, int flag);
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05001352extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1353 __u64 start, __u64 len);
1354
Aneesh Kumar K.V2ccb5fb2009-01-05 21:49:55 -05001355/*
1356 * Add new method to test wether block and inode bitmaps are properly
1357 * initialized. With uninit_bg reading the block from disk is not enough
1358 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1359 */
1360#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1361
1362static inline int bitmap_uptodate(struct buffer_head *bh)
1363{
1364 return (buffer_uptodate(bh) &&
1365 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1366}
1367static inline void set_bitmap_uptodate(struct buffer_head *bh)
1368{
1369 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1370}
1371
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001372#endif /* __KERNEL__ */
1373
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04001374#endif /* _EXT4_H */