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Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04002 * ext4_i.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_i.h
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 */
15
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040016#ifndef _EXT4_I
17#define _EXT4_I
Dave Kleikampac27a0e2006-10-11 01:20:50 -070018
19#include <linux/rwsem.h>
20#include <linux/rbtree.h>
21#include <linux/seqlock.h>
22#include <linux/mutex.h>
23
24/* data type for block offset of block group */
Mingming Cao617ba132006-10-11 01:20:53 -070025typedef int ext4_grpblk_t;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070026
27/* data type for filesystem-wide blocks number */
Mingming Cao2ae02102006-10-11 01:21:11 -070028typedef unsigned long long ext4_fsblk_t;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070029
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -050030/* data type for file logical block number */
31typedef __u32 ext4_lblk_t;
32
Avantika Mathurfd2d4292008-01-28 23:58:27 -050033/* data type for block group number */
Theodore Ts'oa9df9a42009-01-05 22:18:16 -050034typedef unsigned int ext4_group_t;
Avantika Mathurfd2d4292008-01-28 23:58:27 -050035
Dave Kleikampac27a0e2006-10-11 01:20:50 -070036#define rsv_start rsv_window._rsv_start
37#define rsv_end rsv_window._rsv_end
38
39/*
Alex Tomasa86c6182006-10-11 01:21:03 -070040 * storage for cached extent
41 */
42struct ext4_ext_cache {
Alex Tomasf65e6fb2006-10-11 01:21:05 -070043 ext4_fsblk_t ec_start;
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -050044 ext4_lblk_t ec_block;
Alex Tomasf65e6fb2006-10-11 01:21:05 -070045 __u32 ec_len; /* must be 32bit to return holes */
46 __u32 ec_type;
Alex Tomasa86c6182006-10-11 01:21:03 -070047};
48
49/*
Shen Feng8a356942008-07-11 19:27:31 -040050 * fourth extended file system inode data in memory
Dave Kleikampac27a0e2006-10-11 01:20:50 -070051 */
Mingming Cao617ba132006-10-11 01:20:53 -070052struct ext4_inode_info {
Dave Kleikampac27a0e2006-10-11 01:20:50 -070053 __le32 i_data[15]; /* unconverted */
54 __u32 i_flags;
Mingming Cao617ba132006-10-11 01:20:53 -070055 ext4_fsblk_t i_file_acl;
Dave Kleikampac27a0e2006-10-11 01:20:50 -070056 __u32 i_dtime;
57
58 /*
59 * i_block_group is the number of the block group which contains
60 * this file's inode. Constant across the lifetime of the inode,
61 * it is ued for making block allocation decisions - we try to
62 * place a file's data blocks near its inode block, and new inodes
63 * near to their parent directory's inode.
64 */
Avantika Mathurfd2d4292008-01-28 23:58:27 -050065 ext4_group_t i_block_group;
Mingming Cao617ba132006-10-11 01:20:53 -070066 __u32 i_state; /* Dynamic state flags for ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -070067
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -050068 ext4_lblk_t i_dir_start_lookup;
Theodore Ts'o03010a32008-10-10 20:02:48 -040069#ifdef CONFIG_EXT4_FS_XATTR
Dave Kleikampac27a0e2006-10-11 01:20:50 -070070 /*
71 * Extended attributes can be read independently of the main file
72 * data. Taking i_mutex even when reading would cause contention
73 * between readers of EAs and writers of regular file data, so
74 * instead we synchronize on xattr_sem when reading or changing
75 * EAs.
76 */
77 struct rw_semaphore xattr_sem;
78#endif
Theodore Ts'o03010a32008-10-10 20:02:48 -040079#ifdef CONFIG_EXT4_FS_POSIX_ACL
Dave Kleikampac27a0e2006-10-11 01:20:50 -070080 struct posix_acl *i_acl;
81 struct posix_acl *i_default_acl;
82#endif
83
84 struct list_head i_orphan; /* unlinked but open inodes */
85
86 /*
87 * i_disksize keeps track of what the inode size is ON DISK, not
88 * in memory. During truncate, i_size is set to the new size by
Mingming Cao617ba132006-10-11 01:20:53 -070089 * the VFS prior to calling ext4_truncate(), but the filesystem won't
Dave Kleikampac27a0e2006-10-11 01:20:50 -070090 * set i_disksize to 0 until the truncate is actually under way.
91 *
92 * The intent is that i_disksize always represents the blocks which
93 * are used by this file. This allows recovery to restart truncate
94 * on orphans if we crash during truncate. We actually write i_disksize
95 * into the on-disk inode when writing inodes out, instead of i_size.
96 *
97 * The only time when i_disksize and i_size may be different is when
98 * a truncate is in progress. The only things which change i_disksize
Mingming Cao617ba132006-10-11 01:20:53 -070099 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700100 */
101 loff_t i_disksize;
102
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700103 /*
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -0500104 * i_data_sem is for serialising ext4_truncate() against
Mingming Cao617ba132006-10-11 01:20:53 -0700105 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700106 * data tree are chopped off during truncate. We can't do that in
Mingming Cao617ba132006-10-11 01:20:53 -0700107 * ext4 because whenever we perform intermediate commits during
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700108 * truncate, the inode and all the metadata blocks *must* be in a
109 * consistent state which allows truncation of the orphans to restart
110 * during recovery. Hence we must fix the get_block-vs-truncate race
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -0500111 * by other means, so we have i_data_sem.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700112 */
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -0500113 struct rw_semaphore i_data_sem;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700114 struct inode vfs_inode;
Jan Kara678aaf42008-07-11 19:27:31 -0400115 struct jbd2_inode jinode;
Alex Tomasa86c6182006-10-11 01:21:03 -0700116
Alex Tomasa86c6182006-10-11 01:21:03 -0700117 struct ext4_ext_cache i_cached_extent;
Kalpak Shahef7f3832007-07-18 09:15:20 -0400118 /*
119 * File creation time. Its function is same as that of
120 * struct timespec i_{a,c,m}time in the generic inode.
121 */
122 struct timespec i_crtime;
Alex Tomasc9de5602008-01-29 00:19:52 -0500123
124 /* mballoc */
125 struct list_head i_prealloc_list;
126 spinlock_t i_prealloc_lock;
Mingming Caod2a17632008-07-14 17:52:37 -0400127
128 /* allocation reservation info for delalloc */
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500129 unsigned int i_reserved_data_blocks;
130 unsigned int i_reserved_meta_blocks;
131 unsigned int i_allocated_meta_blocks;
Mingming Caod2a17632008-07-14 17:52:37 -0400132 unsigned short i_delalloc_reserved_flag;
Theodore Ts'o498e5f22008-11-05 00:14:04 -0500133
134 /* on-disk additional length */
135 __u16 i_extra_isize;
136
Mingming Caod2a17632008-07-14 17:52:37 -0400137 spinlock_t i_block_reservation_lock;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700138};
139
Christoph Hellwig3dcf5452008-04-29 18:13:32 -0400140#endif /* _EXT4_I */