blob: e1103c2a0d429e5093c5dfe9e65737e2041d49df [file] [log] [blame]
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Mingming Cao617ba132006-10-11 01:20:53 -07002 * linux/include/linux/ext4_fs.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
Mingming Cao617ba132006-10-11 01:20:53 -070016#ifndef _LINUX_EXT4_FS_H
17#define _LINUX_EXT4_FS_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>
22
23/*
24 * The second extended filesystem constants/structures
25 */
26
27/*
Mingming Cao617ba132006-10-11 01:20:53 -070028 * Define EXT4FS_DEBUG to produce debug messages
Dave Kleikampac27a0e2006-10-11 01:20:50 -070029 */
Mingming Cao617ba132006-10-11 01:20:53 -070030#undef EXT4FS_DEBUG
Dave Kleikampac27a0e2006-10-11 01:20:50 -070031
32/*
Mingming Cao617ba132006-10-11 01:20:53 -070033 * Define EXT4_RESERVATION to reserve data blocks for expanding files
Dave Kleikampac27a0e2006-10-11 01:20:50 -070034 */
Dave Kleikamp8c55e202007-05-24 13:04:54 -040035#define EXT4_DEFAULT_RESERVE_BLOCKS 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -070036/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
Dave Kleikamp8c55e202007-05-24 13:04:54 -040037#define EXT4_MAX_RESERVE_BLOCKS 1027
Mingming Cao617ba132006-10-11 01:20:53 -070038#define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -070039
40/*
41 * Debug code
42 */
Mingming Cao617ba132006-10-11 01:20:53 -070043#ifdef EXT4FS_DEBUG
44#define ext4_debug(f, a...) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070045 do { \
Mingming Cao617ba132006-10-11 01:20:53 -070046 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070047 __FILE__, __LINE__, __FUNCTION__); \
48 printk (KERN_DEBUG f, ## a); \
49 } while (0)
50#else
Mingming Cao617ba132006-10-11 01:20:53 -070051#define ext4_debug(f, a...) do {} while (0)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070052#endif
53
54/*
55 * Special inodes numbers
56 */
Mingming Cao617ba132006-10-11 01:20:53 -070057#define EXT4_BAD_INO 1 /* Bad blocks inode */
58#define EXT4_ROOT_INO 2 /* Root inode */
59#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
60#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
61#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
62#define EXT4_JOURNAL_INO 8 /* Journal inode */
Dave Kleikampac27a0e2006-10-11 01:20:50 -070063
Mingming Cao617ba132006-10-11 01:20:53 -070064/* First non-reserved inode for old ext4 filesystems */
65#define EXT4_GOOD_OLD_FIRST_INO 11
Dave Kleikampac27a0e2006-10-11 01:20:50 -070066
67/*
68 * Maximal count of links to a file
69 */
Andreas Dilgerf8628a12007-07-18 08:38:01 -040070#define EXT4_LINK_MAX 65000
Dave Kleikampac27a0e2006-10-11 01:20:50 -070071
72/*
73 * Macro-instructions used to manage several block sizes
74 */
Mingming Cao617ba132006-10-11 01:20:53 -070075#define EXT4_MIN_BLOCK_SIZE 1024
Takashi Satoafc7cbc2008-01-28 23:58:27 -050076#define EXT4_MAX_BLOCK_SIZE 65536
77#define EXT4_MIN_BLOCK_LOG_SIZE 10
Dave Kleikampac27a0e2006-10-11 01:20:50 -070078#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -070079# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070080#else
Mingming Cao617ba132006-10-11 01:20:53 -070081# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070082#endif
Mingming Cao617ba132006-10-11 01:20:53 -070083#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
Dave Kleikampac27a0e2006-10-11 01:20:50 -070084#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -070085# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070086#else
Mingming Cao617ba132006-10-11 01:20:53 -070087# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070088#endif
89#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -070090#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
91#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
92#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070093#else
Mingming Cao617ba132006-10-11 01:20:53 -070094#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
95 EXT4_GOOD_OLD_INODE_SIZE : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070096 (s)->s_inode_size)
Mingming Cao617ba132006-10-11 01:20:53 -070097#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
98 EXT4_GOOD_OLD_FIRST_INO : \
Dave Kleikampac27a0e2006-10-11 01:20:50 -070099 (s)->s_first_ino)
100#endif
Amit Aroraa2df2a62007-07-17 21:42:41 -0400101#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700102
103/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700104 * Structure of a blocks group descriptor
105 */
Mingming Cao617ba132006-10-11 01:20:53 -0700106struct ext4_group_desc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700107{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400108 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400109 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
110 __le32 bg_inode_table_lo; /* Inodes table block */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700111 __le16 bg_free_blocks_count; /* Free blocks count */
112 __le16 bg_free_inodes_count; /* Free inodes count */
113 __le16 bg_used_dirs_count; /* Directories count */
Andreas Dilger717d50e2007-10-16 18:38:25 -0400114 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
115 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
116 __le16 bg_itable_unused; /* Unused inodes count */
117 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700118 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
119 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
120 __le32 bg_inode_table_hi; /* Inodes table block MSB */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700121};
122
Andreas Dilger717d50e2007-10-16 18:38:25 -0400123#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
124#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
125#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
126
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700127#ifdef __KERNEL__
128#include <linux/ext4_fs_i.h>
129#include <linux/ext4_fs_sb.h>
130#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700131/*
132 * Macro-instructions used to manage group descriptors
133 */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700134#define EXT4_MIN_DESC_SIZE 32
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700135#define EXT4_MIN_DESC_SIZE_64BIT 64
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700136#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
137#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700138#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700139# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
140# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
141# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
142# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700143#else
Mingming Cao617ba132006-10-11 01:20:53 -0700144# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700145# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
Mingming Cao617ba132006-10-11 01:20:53 -0700146# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700147#endif
148
149/*
150 * Constants relative to the data blocks
151 */
Mingming Cao617ba132006-10-11 01:20:53 -0700152#define EXT4_NDIR_BLOCKS 12
153#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
154#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
155#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
156#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700157
158/*
159 * Inode flags
160 */
Mingming Cao617ba132006-10-11 01:20:53 -0700161#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
162#define EXT4_UNRM_FL 0x00000002 /* Undelete */
163#define EXT4_COMPR_FL 0x00000004 /* Compress file */
164#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
165#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
166#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
167#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
168#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700169/* Reserved for compression usage... */
Mingming Cao617ba132006-10-11 01:20:53 -0700170#define EXT4_DIRTY_FL 0x00000100
171#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
172#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
173#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700174/* End compression flags --- maybe not all used */
Mingming Cao617ba132006-10-11 01:20:53 -0700175#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
176#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
177#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
178#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
179#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
180#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
181#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
Alex Tomasa86c6182006-10-11 01:21:03 -0700182#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700183
Alex Tomasa86c6182006-10-11 01:21:03 -0700184#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
Mingming Cao617ba132006-10-11 01:20:53 -0700185#define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700186
187/*
188 * Inode dynamic state flags
189 */
Mingming Cao617ba132006-10-11 01:20:53 -0700190#define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
191#define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
192#define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
Kalpak Shah6dd4ee72007-07-18 09:19:57 -0400193#define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700194
195/* Used to pass group descriptor data when online resize is done */
Mingming Cao617ba132006-10-11 01:20:53 -0700196struct ext4_new_group_input {
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400197 __u32 group; /* Group number for this data */
198 __u64 block_bitmap; /* Absolute block number of block bitmap */
199 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
200 __u64 inode_table; /* Absolute block number of inode table start */
201 __u32 blocks_count; /* Total number of blocks in this group */
202 __u16 reserved_blocks; /* Number of reserved blocks in this group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700203 __u16 unused;
204};
205
Mingming Cao617ba132006-10-11 01:20:53 -0700206/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
207struct ext4_new_group_data {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700208 __u32 group;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700209 __u64 block_bitmap;
210 __u64 inode_bitmap;
211 __u64 inode_table;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700212 __u32 blocks_count;
213 __u16 reserved_blocks;
214 __u16 unused;
215 __u32 free_blocks_count;
216};
217
Amit Aroraa2df2a62007-07-17 21:42:41 -0400218/*
219 * Following is used by preallocation code to tell get_blocks() that we
220 * want uninitialzed extents.
221 */
222#define EXT4_CREATE_UNINITIALIZED_EXT 2
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700223
224/*
225 * ioctl commands
226 */
Mingming Cao617ba132006-10-11 01:20:53 -0700227#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
228#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
229#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
230#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
231#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
232#define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
233#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
234#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
Jose R. Santose23291b2007-07-18 08:57:06 -0400235#ifdef CONFIG_JBD2_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700236#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700237#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700238#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
239#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700240
241/*
242 * ioctl commands in 32 bit emulation
243 */
Mingming Cao617ba132006-10-11 01:20:53 -0700244#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
245#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
246#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
247#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
248#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
249#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
250#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
Jose R. Santose23291b2007-07-18 08:57:06 -0400251#ifdef CONFIG_JBD2_DEBUG
Mingming Cao617ba132006-10-11 01:20:53 -0700252#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700253#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700254#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
255#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700256
257
258/*
259 * Mount options
260 */
Mingming Cao617ba132006-10-11 01:20:53 -0700261struct ext4_mount_options {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700262 unsigned long s_mount_opt;
263 uid_t s_resuid;
264 gid_t s_resgid;
265 unsigned long s_commit_interval;
266#ifdef CONFIG_QUOTA
267 int s_jquota_fmt;
268 char *s_qf_names[MAXQUOTAS];
269#endif
270};
271
272/*
273 * Structure of an inode on the disk
274 */
Mingming Cao617ba132006-10-11 01:20:53 -0700275struct ext4_inode {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700276 __le16 i_mode; /* File mode */
277 __le16 i_uid; /* Low 16 bits of Owner Uid */
278 __le32 i_size; /* Size in bytes */
279 __le32 i_atime; /* Access time */
Kalpak Shahef7f3832007-07-18 09:15:20 -0400280 __le32 i_ctime; /* Inode Change time */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700281 __le32 i_mtime; /* Modification time */
282 __le32 i_dtime; /* Deletion Time */
283 __le16 i_gid; /* Low 16 bits of Group Id */
284 __le16 i_links_count; /* Links count */
285 __le32 i_blocks; /* Blocks count */
286 __le32 i_flags; /* File flags */
287 union {
288 struct {
289 __u32 l_i_reserved1;
290 } linux1;
291 struct {
292 __u32 h_i_translator;
293 } hurd1;
294 struct {
295 __u32 m_i_reserved1;
296 } masix1;
297 } osd1; /* OS dependent 1 */
Mingming Cao617ba132006-10-11 01:20:53 -0700298 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700299 __le32 i_generation; /* File version (for NFS) */
300 __le32 i_file_acl; /* File ACL */
301 __le32 i_dir_acl; /* Directory ACL */
Coly Lif077d0d2007-10-16 18:38:25 -0400302 __le32 i_obso_faddr; /* Obsoleted fragment address */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700303 union {
304 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400305 __le16 l_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700306 __le16 l_i_file_acl_high;
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400307 __le16 l_i_uid_high; /* these 2 fields */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700308 __le16 l_i_gid_high; /* were reserved2[0] */
309 __u32 l_i_reserved2;
310 } linux2;
311 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400312 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700313 __u16 h_i_mode_high;
314 __u16 h_i_uid_high;
315 __u16 h_i_gid_high;
316 __u32 h_i_author;
317 } hurd2;
318 struct {
Coly Lif077d0d2007-10-16 18:38:25 -0400319 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700320 __le16 m_i_file_acl_high;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700321 __u32 m_i_reserved2[2];
322 } masix2;
323 } osd2; /* OS dependent 2 */
324 __le16 i_extra_isize;
325 __le16 i_pad1;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400326 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
327 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
328 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
329 __le32 i_crtime; /* File Creation time */
330 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700331};
332
333#define i_size_high i_dir_acl
334
Kalpak Shahef7f3832007-07-18 09:15:20 -0400335#define EXT4_EPOCH_BITS 2
336#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
337#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
338
339/*
340 * Extended fields will fit into an inode if the filesystem was formatted
341 * with large inodes (-I 256 or larger) and there are not currently any EAs
342 * consuming all of the available space. For new inodes we always reserve
343 * enough space for the kernel's known extended fields, but for inodes
344 * created with an old kernel this might not have been the case. None of
345 * the extended inode fields is critical for correct filesystem operation.
346 * This macro checks if a certain field fits in the inode. Note that
347 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
348 */
349#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
350 ((offsetof(typeof(*ext4_inode), field) + \
351 sizeof((ext4_inode)->field)) \
352 <= (EXT4_GOOD_OLD_INODE_SIZE + \
353 (einode)->i_extra_isize)) \
354
355static inline __le32 ext4_encode_extra_time(struct timespec *time)
356{
357 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
358 time->tv_sec >> 32 : 0) |
359 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
360}
361
362static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
363{
364 if (sizeof(time->tv_sec) > 4)
365 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
366 << 32;
367 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
368}
369
370#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
371do { \
372 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
373 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
374 (raw_inode)->xtime ## _extra = \
375 ext4_encode_extra_time(&(inode)->xtime); \
376} while (0)
377
378#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
379do { \
380 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
381 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
382 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
383 (raw_inode)->xtime ## _extra = \
384 ext4_encode_extra_time(&(einode)->xtime); \
385} while (0)
386
387#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
388do { \
389 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
390 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
391 ext4_decode_extra_time(&(inode)->xtime, \
392 raw_inode->xtime ## _extra); \
393} while (0)
394
395#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
396do { \
397 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
398 (einode)->xtime.tv_sec = \
399 (signed)le32_to_cpu((raw_inode)->xtime); \
400 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
401 ext4_decode_extra_time(&(einode)->xtime, \
402 raw_inode->xtime ## _extra); \
403} while (0)
404
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700405#if defined(__KERNEL__) || defined(__linux__)
406#define i_reserved1 osd1.linux1.l_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700407#define i_file_acl_high osd2.linux2.l_i_file_acl_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700408#define i_uid_low i_uid
409#define i_gid_low i_gid
410#define i_uid_high osd2.linux2.l_i_uid_high
411#define i_gid_high osd2.linux2.l_i_gid_high
412#define i_reserved2 osd2.linux2.l_i_reserved2
413
414#elif defined(__GNU__)
415
416#define i_translator osd1.hurd1.h_i_translator
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700417#define i_uid_high osd2.hurd2.h_i_uid_high
418#define i_gid_high osd2.hurd2.h_i_gid_high
419#define i_author osd2.hurd2.h_i_author
420
421#elif defined(__masix__)
422
423#define i_reserved1 osd1.masix1.m_i_reserved1
Badari Pulavartya1ddeb72006-10-11 01:21:09 -0700424#define i_file_acl_high osd2.masix2.m_i_file_acl_high
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700425#define i_reserved2 osd2.masix2.m_i_reserved2
426
427#endif /* defined(__KERNEL__) || defined(__linux__) */
428
429/*
430 * File system states
431 */
Mingming Cao617ba132006-10-11 01:20:53 -0700432#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
433#define EXT4_ERROR_FS 0x0002 /* Errors detected */
434#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700435
436/*
437 * Mount flags
438 */
Mingming Cao617ba132006-10-11 01:20:53 -0700439#define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
440#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
441#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
442#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
443#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
444#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
445#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
446#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
447#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
448#define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
449#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
450#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
451#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
452#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
453#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
454#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
455#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
456#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
457#define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
458#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
459#define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
460#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
461#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
462#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
Alex Tomasa86c6182006-10-11 01:21:03 -0700463#define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700464
Mingming Cao617ba132006-10-11 01:20:53 -0700465/* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700466#ifndef _LINUX_EXT2_FS_H
Mingming Cao617ba132006-10-11 01:20:53 -0700467#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
468#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
469#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
470 EXT4_MOUNT_##opt)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700471#else
Mingming Cao617ba132006-10-11 01:20:53 -0700472#define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
473#define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
474#define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700475#endif
476
Mingming Cao617ba132006-10-11 01:20:53 -0700477#define ext4_set_bit ext2_set_bit
478#define ext4_set_bit_atomic ext2_set_bit_atomic
479#define ext4_clear_bit ext2_clear_bit
480#define ext4_clear_bit_atomic ext2_clear_bit_atomic
481#define ext4_test_bit ext2_test_bit
482#define ext4_find_first_zero_bit ext2_find_first_zero_bit
483#define ext4_find_next_zero_bit ext2_find_next_zero_bit
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700484
485/*
486 * Maximal mount counts between two filesystem checks
487 */
Mingming Cao617ba132006-10-11 01:20:53 -0700488#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
489#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700490
491/*
492 * Behaviour when detecting errors
493 */
Mingming Cao617ba132006-10-11 01:20:53 -0700494#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
495#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
496#define EXT4_ERRORS_PANIC 3 /* Panic */
497#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700498
499/*
500 * Structure of the super block
501 */
Mingming Cao617ba132006-10-11 01:20:53 -0700502struct ext4_super_block {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700503/*00*/ __le32 s_inodes_count; /* Inodes count */
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -0400504 __le32 s_blocks_count_lo; /* Blocks count */
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -0400505 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
506 __le32 s_free_blocks_count_lo; /* Free blocks count */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700507/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
508 __le32 s_first_data_block; /* First Data Block */
509 __le32 s_log_block_size; /* Block size */
Coly Lif077d0d2007-10-16 18:38:25 -0400510 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700511/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
Coly Lif077d0d2007-10-16 18:38:25 -0400512 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700513 __le32 s_inodes_per_group; /* # Inodes per group */
514 __le32 s_mtime; /* Mount time */
515/*30*/ __le32 s_wtime; /* Write time */
516 __le16 s_mnt_count; /* Mount count */
517 __le16 s_max_mnt_count; /* Maximal mount count */
518 __le16 s_magic; /* Magic signature */
519 __le16 s_state; /* File system state */
520 __le16 s_errors; /* Behaviour when detecting errors */
521 __le16 s_minor_rev_level; /* minor revision level */
522/*40*/ __le32 s_lastcheck; /* time of last check */
523 __le32 s_checkinterval; /* max. time between checks */
524 __le32 s_creator_os; /* OS */
525 __le32 s_rev_level; /* Revision level */
526/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
527 __le16 s_def_resgid; /* Default gid for reserved blocks */
528 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700529 * These fields are for EXT4_DYNAMIC_REV superblocks only.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700530 *
531 * Note: the difference between the compatible feature set and
532 * the incompatible feature set is that if there is a bit set
533 * in the incompatible feature set that the kernel doesn't
534 * know about, it should refuse to mount the filesystem.
535 *
536 * e2fsck's requirements are more strict; if it doesn't know
537 * about a feature in either the compatible or incompatible
538 * feature set, it must abort and not try to meddle with
539 * things it doesn't understand...
540 */
541 __le32 s_first_ino; /* First non-reserved inode */
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700542 __le16 s_inode_size; /* size of inode structure */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700543 __le16 s_block_group_nr; /* block group # of this superblock */
544 __le32 s_feature_compat; /* compatible feature set */
545/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
546 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
547/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
548/*78*/ char s_volume_name[16]; /* volume name */
549/*88*/ char s_last_mounted[64]; /* directory where last mounted */
550/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
551 /*
552 * Performance hints. Directory preallocation should only
Mingming Cao617ba132006-10-11 01:20:53 -0700553 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700554 */
555 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
556 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
557 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
558 /*
Mingming Cao617ba132006-10-11 01:20:53 -0700559 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700560 */
561/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
562/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
563 __le32 s_journal_dev; /* device number of journal file */
564 __le32 s_last_orphan; /* start of list of inodes to delete */
565 __le32 s_hash_seed[4]; /* HTREE hash seed */
566 __u8 s_def_hash_version; /* Default hash version to use */
567 __u8 s_reserved_char_pad;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -0700568 __le16 s_desc_size; /* size of group descriptor */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700569/*100*/ __le32 s_default_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700570 __le32 s_first_meta_bg; /* First metablock block group */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700571 __le32 s_mkfs_time; /* When the filesystem was created */
572 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
573 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
574/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
575 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
576 __le32 s_free_blocks_count_hi; /* Free blocks count */
Aneesh Kumar K.Vc1bddad2007-10-16 18:38:25 -0400577 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
578 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
579 __le32 s_flags; /* Miscellaneous flags */
580 __le16 s_raid_stride; /* RAID stride */
581 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
582 __le64 s_mmp_block; /* Block for multi-mount protection */
583 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
Theodore Ts'o436bd752007-05-31 12:43:28 -0400584 __u32 s_reserved[163]; /* Padding to the end of the block */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700585};
586
587#ifdef __KERNEL__
Mingming Cao617ba132006-10-11 01:20:53 -0700588static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700589{
590 return sb->s_fs_info;
591}
Mingming Cao617ba132006-10-11 01:20:53 -0700592static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700593{
Mingming Cao617ba132006-10-11 01:20:53 -0700594 return container_of(inode, struct ext4_inode_info, vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700595}
596
Kalpak Shahef7f3832007-07-18 09:15:20 -0400597static inline struct timespec ext4_current_time(struct inode *inode)
598{
599 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
600 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
601}
602
603
Mingming Cao617ba132006-10-11 01:20:53 -0700604static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700605{
Mingming Cao617ba132006-10-11 01:20:53 -0700606 return ino == EXT4_ROOT_INO ||
607 ino == EXT4_JOURNAL_INO ||
608 ino == EXT4_RESIZE_INO ||
609 (ino >= EXT4_FIRST_INO(sb) &&
610 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700611}
612#else
Mingming Cao617ba132006-10-11 01:20:53 -0700613/* Assume that user mode programs are passing in an ext4fs superblock, not
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700614 * a kernel struct super_block. This will allow us to call the feature-test
615 * macros from user land. */
Mingming Cao617ba132006-10-11 01:20:53 -0700616#define EXT4_SB(sb) (sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700617#endif
618
Mingming Cao617ba132006-10-11 01:20:53 -0700619#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700620
621/*
622 * Codes for operating systems
623 */
Mingming Cao617ba132006-10-11 01:20:53 -0700624#define EXT4_OS_LINUX 0
625#define EXT4_OS_HURD 1
626#define EXT4_OS_MASIX 2
627#define EXT4_OS_FREEBSD 3
628#define EXT4_OS_LITES 4
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700629
630/*
631 * Revision levels
632 */
Mingming Cao617ba132006-10-11 01:20:53 -0700633#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
634#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700635
Mingming Cao617ba132006-10-11 01:20:53 -0700636#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
637#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700638
Mingming Cao617ba132006-10-11 01:20:53 -0700639#define EXT4_GOOD_OLD_INODE_SIZE 128
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700640
641/*
642 * Feature set definitions
643 */
644
Mingming Cao617ba132006-10-11 01:20:53 -0700645#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
646 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
647#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
648 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
649#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
650 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
651#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
652 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
653#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
654 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
655#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
656 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
657#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
658 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
659#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
660 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
661#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
662 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700663
Mingming Cao617ba132006-10-11 01:20:53 -0700664#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
665#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
666#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
667#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
668#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
669#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700670
Mingming Cao617ba132006-10-11 01:20:53 -0700671#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
672#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
673#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
Andreas Dilger717d50e2007-10-16 18:38:25 -0400674#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400675#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
Kalpak Shahef7f3832007-07-18 09:15:20 -0400676#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700677
Mingming Cao617ba132006-10-11 01:20:53 -0700678#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
679#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
680#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
681#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
682#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
Alex Tomasa86c6182006-10-11 01:21:03 -0700683#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700684#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
Jose R. Santosce421582007-10-16 18:38:25 -0400685#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700686
Mingming Cao617ba132006-10-11 01:20:53 -0700687#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
688#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
689 EXT4_FEATURE_INCOMPAT_RECOVER| \
Alex Tomasa86c6182006-10-11 01:21:03 -0700690 EXT4_FEATURE_INCOMPAT_META_BG| \
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700691 EXT4_FEATURE_INCOMPAT_EXTENTS| \
Jose R. Santosce421582007-10-16 18:38:25 -0400692 EXT4_FEATURE_INCOMPAT_64BIT| \
693 EXT4_FEATURE_INCOMPAT_FLEX_BG)
Mingming Cao617ba132006-10-11 01:20:53 -0700694#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
695 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
Andreas Dilger717d50e2007-10-16 18:38:25 -0400696 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
Andreas Dilgerf8628a12007-07-18 08:38:01 -0400697 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
Kalpak Shahef7f3832007-07-18 09:15:20 -0400698 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
Mingming Cao617ba132006-10-11 01:20:53 -0700699 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700700
701/*
702 * Default values for user and/or group using reserved blocks
703 */
Mingming Cao617ba132006-10-11 01:20:53 -0700704#define EXT4_DEF_RESUID 0
705#define EXT4_DEF_RESGID 0
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700706
707/*
708 * Default mount options
709 */
Mingming Cao617ba132006-10-11 01:20:53 -0700710#define EXT4_DEFM_DEBUG 0x0001
711#define EXT4_DEFM_BSDGROUPS 0x0002
712#define EXT4_DEFM_XATTR_USER 0x0004
713#define EXT4_DEFM_ACL 0x0008
714#define EXT4_DEFM_UID16 0x0010
715#define EXT4_DEFM_JMODE 0x0060
716#define EXT4_DEFM_JMODE_DATA 0x0020
717#define EXT4_DEFM_JMODE_ORDERED 0x0040
718#define EXT4_DEFM_JMODE_WBACK 0x0060
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700719
720/*
721 * Structure of a directory entry
722 */
Mingming Cao617ba132006-10-11 01:20:53 -0700723#define EXT4_NAME_LEN 255
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700724
Mingming Cao617ba132006-10-11 01:20:53 -0700725struct ext4_dir_entry {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700726 __le32 inode; /* Inode number */
727 __le16 rec_len; /* Directory entry length */
728 __le16 name_len; /* Name length */
Mingming Cao617ba132006-10-11 01:20:53 -0700729 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700730};
731
732/*
Mingming Cao617ba132006-10-11 01:20:53 -0700733 * The new version of the directory entry. Since EXT4 structures are
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700734 * stored in intel byte order, and the name_len field could never be
735 * bigger than 255 chars, it's safe to reclaim the extra byte for the
736 * file_type field.
737 */
Mingming Cao617ba132006-10-11 01:20:53 -0700738struct ext4_dir_entry_2 {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700739 __le32 inode; /* Inode number */
740 __le16 rec_len; /* Directory entry length */
741 __u8 name_len; /* Name length */
742 __u8 file_type;
Mingming Cao617ba132006-10-11 01:20:53 -0700743 char name[EXT4_NAME_LEN]; /* File name */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700744};
745
746/*
Mingming Cao617ba132006-10-11 01:20:53 -0700747 * Ext4 directory file types. Only the low 3 bits are used. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700748 * other bits are reserved for now.
749 */
Mingming Cao617ba132006-10-11 01:20:53 -0700750#define EXT4_FT_UNKNOWN 0
751#define EXT4_FT_REG_FILE 1
752#define EXT4_FT_DIR 2
753#define EXT4_FT_CHRDEV 3
754#define EXT4_FT_BLKDEV 4
755#define EXT4_FT_FIFO 5
756#define EXT4_FT_SOCK 6
757#define EXT4_FT_SYMLINK 7
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700758
Mingming Cao617ba132006-10-11 01:20:53 -0700759#define EXT4_FT_MAX 8
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700760
761/*
Mingming Cao617ba132006-10-11 01:20:53 -0700762 * EXT4_DIR_PAD defines the directory entries boundaries
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700763 *
764 * NOTE: It must be a multiple of 4
765 */
Mingming Cao617ba132006-10-11 01:20:53 -0700766#define EXT4_DIR_PAD 4
767#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
768#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
769 ~EXT4_DIR_ROUND)
Jan Karaa72d7f82008-01-28 23:58:27 -0500770#define EXT4_MAX_REC_LEN ((1<<16)-1)
771
772static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
773{
774 unsigned len = le16_to_cpu(dlen);
775
776 if (len == EXT4_MAX_REC_LEN)
777 return 1 << 16;
778 return len;
779}
780
781static inline __le16 ext4_rec_len_to_disk(unsigned len)
782{
783 if (len == (1 << 16))
784 return cpu_to_le16(EXT4_MAX_REC_LEN);
785 else if (len > (1 << 16))
786 BUG();
787 return cpu_to_le16(len);
788}
789
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700790/*
791 * Hash Tree Directory indexing
792 * (c) Daniel Phillips, 2001
793 */
794
Eric Sandeen4074fe32007-10-16 18:38:25 -0400795#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
796 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
Mingming Cao617ba132006-10-11 01:20:53 -0700797 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
798#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
799#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700800
801/* Legal values for the dx_root hash_version field: */
802
803#define DX_HASH_LEGACY 0
804#define DX_HASH_HALF_MD4 1
805#define DX_HASH_TEA 2
806
807#ifdef __KERNEL__
808
809/* hash info structure used by the directory hash */
810struct dx_hash_info
811{
812 u32 hash;
813 u32 minor_hash;
814 int hash_version;
815 u32 *seed;
816};
817
Mingming Cao617ba132006-10-11 01:20:53 -0700818#define EXT4_HTREE_EOF 0x7fffffff
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700819
820/*
Mingming Cao617ba132006-10-11 01:20:53 -0700821 * Control parameters used by ext4_htree_next_block
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700822 */
823#define HASH_NB_ALWAYS 1
824
825
826/*
827 * Describe an inode's exact location on disk and in memory
828 */
Mingming Cao617ba132006-10-11 01:20:53 -0700829struct ext4_iloc
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700830{
831 struct buffer_head *bh;
832 unsigned long offset;
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500833 ext4_group_t block_group;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700834};
835
Mingming Cao617ba132006-10-11 01:20:53 -0700836static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700837{
Mingming Cao617ba132006-10-11 01:20:53 -0700838 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700839}
840
841/*
842 * This structure is stuffed into the struct file's private_data field
843 * for directories. It is where we put information so that we can do
844 * readdir operations in hash tree order.
845 */
846struct dir_private_info {
847 struct rb_root root;
848 struct rb_node *curr_node;
849 struct fname *extra_fname;
850 loff_t last_pos;
851 __u32 curr_hash;
852 __u32 curr_minor_hash;
853 __u32 next_hash;
854};
855
856/* calculate the first block number of the group */
Mingming Cao617ba132006-10-11 01:20:53 -0700857static inline ext4_fsblk_t
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500858ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700859{
Mingming Cao617ba132006-10-11 01:20:53 -0700860 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
861 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700862}
863
864/*
865 * Special error return code only used by dx_probe() and its callers.
866 */
867#define ERR_BAD_DX_DIR -75000
868
Andrew Morton72b64b52006-10-11 01:21:18 -0700869void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
870 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
Mingming Cao3a5b2ec2006-10-11 01:21:05 -0700871
872/*
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700873 * Function prototypes
874 */
875
876/*
877 * Ok, these declarations are also in <linux/kernel.h> but none of the
Mingming Cao617ba132006-10-11 01:20:53 -0700878 * ext4 source programs needs to include it so they are duplicated here.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700879 */
Dave Kleikamp8c55e202007-05-24 13:04:54 -0400880# define NORET_TYPE /**/
881# define ATTRIB_NORET __attribute__((noreturn))
882# define NORET_AND noreturn,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700883
884/* balloc.c */
Mingming Cao3a5b2ec2006-10-11 01:21:05 -0700885extern unsigned int ext4_block_group(struct super_block *sb,
886 ext4_fsblk_t blocknr);
887extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
888 ext4_fsblk_t blocknr);
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500889extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
890extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
891 ext4_group_t group);
Mingming Cao617ba132006-10-11 01:20:53 -0700892extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
893 ext4_fsblk_t goal, int *errp);
894extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
895 ext4_fsblk_t goal, unsigned long *count, int *errp);
896extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
897 ext4_fsblk_t block, unsigned long count);
898extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
899 ext4_fsblk_t block, unsigned long count,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700900 unsigned long *pdquot_freed_blocks);
Mingming Cao617ba132006-10-11 01:20:53 -0700901extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
902extern void ext4_check_blocks_bitmap (struct super_block *);
903extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
Avantika Mathurfd2d4292008-01-28 23:58:27 -0500904 ext4_group_t block_group,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700905 struct buffer_head ** bh);
Mingming Cao617ba132006-10-11 01:20:53 -0700906extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
907extern void ext4_init_block_alloc_info(struct inode *);
908extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700909
910/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700911extern int ext4_check_dir_entry(const char *, struct inode *,
912 struct ext4_dir_entry_2 *,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700913 struct buffer_head *, unsigned long);
Mingming Cao617ba132006-10-11 01:20:53 -0700914extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700915 __u32 minor_hash,
Mingming Cao617ba132006-10-11 01:20:53 -0700916 struct ext4_dir_entry_2 *dirent);
917extern void ext4_htree_free_dir_info(struct dir_private_info *p);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700918
919/* fsync.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700920extern int ext4_sync_file (struct file *, struct dentry *, int);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700921
922/* hash.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700923extern int ext4fs_dirhash(const char *name, int len, struct
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700924 dx_hash_info *hinfo);
925
926/* ialloc.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700927extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
928extern void ext4_free_inode (handle_t *, struct inode *);
929extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
930extern unsigned long ext4_count_free_inodes (struct super_block *);
931extern unsigned long ext4_count_dirs (struct super_block *);
932extern void ext4_check_inodes_bitmap (struct super_block *);
933extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700934
935
936/* inode.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700937int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
938 struct buffer_head *bh, ext4_fsblk_t blocknr);
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500939struct buffer_head *ext4_getblk(handle_t *, struct inode *,
940 ext4_lblk_t, int, int *);
941struct buffer_head *ext4_bread(handle_t *, struct inode *,
942 ext4_lblk_t, int, int *);
Mingming Cao617ba132006-10-11 01:20:53 -0700943int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -0500944 ext4_lblk_t iblock, unsigned long maxblocks,
945 struct buffer_head *bh_result,
946 int create, int extend_disksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700947
Mingming Cao617ba132006-10-11 01:20:53 -0700948extern void ext4_read_inode (struct inode *);
949extern int ext4_write_inode (struct inode *, int);
950extern int ext4_setattr (struct dentry *, struct iattr *);
951extern void ext4_delete_inode (struct inode *);
952extern int ext4_sync_inode (handle_t *, struct inode *);
953extern void ext4_discard_reservation (struct inode *);
954extern void ext4_dirty_inode(struct inode *);
955extern int ext4_change_inode_journal_flag(struct inode *, int);
956extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
957extern void ext4_truncate (struct inode *);
958extern void ext4_set_inode_flags(struct inode *);
Jan Karaff9ddf72007-07-18 09:24:20 -0400959extern void ext4_get_inode_flags(struct ext4_inode_info *);
Mingming Cao617ba132006-10-11 01:20:53 -0700960extern void ext4_set_aops(struct inode *inode);
Alex Tomasa86c6182006-10-11 01:21:03 -0700961extern int ext4_writepage_trans_blocks(struct inode *);
962extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
963 struct address_space *mapping, loff_t from);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700964
965/* ioctl.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700966extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700967 unsigned long);
Mingming Cao617ba132006-10-11 01:20:53 -0700968extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700969
970/* namei.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700971extern int ext4_orphan_add(handle_t *, struct inode *);
972extern int ext4_orphan_del(handle_t *, struct inode *);
973extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700974 __u32 start_minor_hash, __u32 *next_hash);
975
976/* resize.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700977extern int ext4_group_add(struct super_block *sb,
978 struct ext4_new_group_data *input);
979extern int ext4_group_extend(struct super_block *sb,
980 struct ext4_super_block *es,
981 ext4_fsblk_t n_blocks_count);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700982
983/* super.c */
Mingming Cao617ba132006-10-11 01:20:53 -0700984extern void ext4_error (struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700985 __attribute__ ((format (printf, 3, 4)));
Mingming Cao617ba132006-10-11 01:20:53 -0700986extern void __ext4_std_error (struct super_block *, const char *, int);
987extern void ext4_abort (struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700988 __attribute__ ((format (printf, 3, 4)));
Mingming Cao617ba132006-10-11 01:20:53 -0700989extern void ext4_warning (struct super_block *, const char *, const char *, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700990 __attribute__ ((format (printf, 3, 4)));
Mingming Cao617ba132006-10-11 01:20:53 -0700991extern void ext4_update_dynamic_rev (struct super_block *sb);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700992extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
993 struct ext4_group_desc *bg);
994extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
995 struct ext4_group_desc *bg);
996extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
997 struct ext4_group_desc *bg);
998extern void ext4_block_bitmap_set(struct super_block *sb,
999 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1000extern void ext4_inode_bitmap_set(struct super_block *sb,
1001 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1002extern void ext4_inode_table_set(struct super_block *sb,
1003 struct ext4_group_desc *bg, ext4_fsblk_t blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001004
1005static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1006{
1007 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001008 le32_to_cpu(es->s_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001009}
1010
1011static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1012{
1013 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001014 le32_to_cpu(es->s_r_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001015}
1016
1017static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1018{
1019 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001020 le32_to_cpu(es->s_free_blocks_count_lo);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001021}
1022
1023static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1024 ext4_fsblk_t blk)
1025{
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04001026 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001027 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1028}
1029
1030static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1031 ext4_fsblk_t blk)
1032{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001033 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001034 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1035}
1036
1037static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1038 ext4_fsblk_t blk)
1039{
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04001040 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001041 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1042}
1043
1044
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001045
Mingming Cao617ba132006-10-11 01:20:53 -07001046#define ext4_std_error(sb, errno) \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001047do { \
1048 if ((errno)) \
Mingming Cao617ba132006-10-11 01:20:53 -07001049 __ext4_std_error((sb), __FUNCTION__, (errno)); \
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001050} while (0)
1051
1052/*
1053 * Inodes and files operations
1054 */
1055
1056/* dir.c */
Mingming Cao617ba132006-10-11 01:20:53 -07001057extern const struct file_operations ext4_dir_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001058
1059/* file.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001060extern const struct inode_operations ext4_file_inode_operations;
Mingming Cao617ba132006-10-11 01:20:53 -07001061extern const struct file_operations ext4_file_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001062
1063/* namei.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001064extern const struct inode_operations ext4_dir_inode_operations;
1065extern const struct inode_operations ext4_special_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001066
1067/* symlink.c */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001068extern const struct inode_operations ext4_symlink_inode_operations;
1069extern const struct inode_operations ext4_fast_symlink_inode_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001070
Alex Tomasa86c6182006-10-11 01:21:03 -07001071/* extents.c */
1072extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1073extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1074extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001075 ext4_lblk_t iblock,
Alex Tomasa86c6182006-10-11 01:21:03 -07001076 unsigned long max_blocks, struct buffer_head *bh_result,
1077 int create, int extend_disksize);
1078extern void ext4_ext_truncate(struct inode *, struct page *);
1079extern void ext4_ext_init(struct super_block *);
1080extern void ext4_ext_release(struct super_block *);
Amit Aroraa2df2a62007-07-17 21:42:41 -04001081extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1082 loff_t len);
Alex Tomasa86c6182006-10-11 01:21:03 -07001083static inline int
1084ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
1085 unsigned long max_blocks, struct buffer_head *bh,
1086 int create, int extend_disksize)
1087{
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05001088 int retval;
1089 if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
1090 retval = ext4_ext_get_blocks(handle, inode,
1091 (ext4_lblk_t)block, max_blocks,
1092 bh, create, extend_disksize);
1093 } else {
1094 retval = ext4_get_blocks_handle(handle, inode,
1095 (ext4_lblk_t)block, max_blocks,
1096 bh, create, extend_disksize);
1097 }
1098 return retval;
Alex Tomasa86c6182006-10-11 01:21:03 -07001099}
1100
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001101
1102#endif /* __KERNEL__ */
1103
Mingming Cao617ba132006-10-11 01:20:53 -07001104#endif /* _LINUX_EXT4_FS_H */