xref: /openbmc/linux/fs/ext2/ext2.h (revision 171f1bc7)
1 #include <linux/fs.h>
2 #include <linux/ext2_fs.h>
3 
4 /*
5  * ext2 mount options
6  */
7 struct ext2_mount_options {
8 	unsigned long s_mount_opt;
9 	uid_t s_resuid;
10 	gid_t s_resgid;
11 };
12 
13 /*
14  * second extended file system inode data in memory
15  */
16 struct ext2_inode_info {
17 	__le32	i_data[15];
18 	__u32	i_flags;
19 	__u32	i_faddr;
20 	__u8	i_frag_no;
21 	__u8	i_frag_size;
22 	__u16	i_state;
23 	__u32	i_file_acl;
24 	__u32	i_dir_acl;
25 	__u32	i_dtime;
26 
27 	/*
28 	 * i_block_group is the number of the block group which contains
29 	 * this file's inode.  Constant across the lifetime of the inode,
30 	 * it is used for making block allocation decisions - we try to
31 	 * place a file's data blocks near its inode block, and new inodes
32 	 * near to their parent directory's inode.
33 	 */
34 	__u32	i_block_group;
35 
36 	/* block reservation info */
37 	struct ext2_block_alloc_info *i_block_alloc_info;
38 
39 	__u32	i_dir_start_lookup;
40 #ifdef CONFIG_EXT2_FS_XATTR
41 	/*
42 	 * Extended attributes can be read independently of the main file
43 	 * data. Taking i_mutex even when reading would cause contention
44 	 * between readers of EAs and writers of regular file data, so
45 	 * instead we synchronize on xattr_sem when reading or changing
46 	 * EAs.
47 	 */
48 	struct rw_semaphore xattr_sem;
49 #endif
50 	rwlock_t i_meta_lock;
51 
52 	/*
53 	 * truncate_mutex is for serialising ext2_truncate() against
54 	 * ext2_getblock().  It also protects the internals of the inode's
55 	 * reservation data structures: ext2_reserve_window and
56 	 * ext2_reserve_window_node.
57 	 */
58 	struct mutex truncate_mutex;
59 	struct inode	vfs_inode;
60 	struct list_head i_orphan;	/* unlinked but open inodes */
61 };
62 
63 /*
64  * Inode dynamic state flags
65  */
66 #define EXT2_STATE_NEW			0x00000001 /* inode is newly created */
67 
68 
69 /*
70  * Function prototypes
71  */
72 
73 /*
74  * Ok, these declarations are also in <linux/kernel.h> but none of the
75  * ext2 source programs needs to include it so they are duplicated here.
76  */
77 
78 static inline struct ext2_inode_info *EXT2_I(struct inode *inode)
79 {
80 	return container_of(inode, struct ext2_inode_info, vfs_inode);
81 }
82 
83 /* balloc.c */
84 extern int ext2_bg_has_super(struct super_block *sb, int group);
85 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
86 extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *);
87 extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,
88 				unsigned long *, int *);
89 extern void ext2_free_blocks (struct inode *, unsigned long,
90 			      unsigned long);
91 extern unsigned long ext2_count_free_blocks (struct super_block *);
92 extern unsigned long ext2_count_dirs (struct super_block *);
93 extern void ext2_check_blocks_bitmap (struct super_block *);
94 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
95 						    unsigned int block_group,
96 						    struct buffer_head ** bh);
97 extern void ext2_discard_reservation (struct inode *);
98 extern int ext2_should_retry_alloc(struct super_block *sb, int *retries);
99 extern void ext2_init_block_alloc_info(struct inode *);
100 extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
101 
102 /* dir.c */
103 extern int ext2_add_link (struct dentry *, struct inode *);
104 extern ino_t ext2_inode_by_name(struct inode *, struct qstr *);
105 extern int ext2_make_empty(struct inode *, struct inode *);
106 extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct qstr *, struct page **);
107 extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);
108 extern int ext2_empty_dir (struct inode *);
109 extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **);
110 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *, int);
111 
112 /* ialloc.c */
113 extern struct inode * ext2_new_inode (struct inode *, int, const struct qstr *);
114 extern void ext2_free_inode (struct inode *);
115 extern unsigned long ext2_count_free_inodes (struct super_block *);
116 extern void ext2_check_inodes_bitmap (struct super_block *);
117 extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
118 
119 /* inode.c */
120 extern struct inode *ext2_iget (struct super_block *, unsigned long);
121 extern int ext2_write_inode (struct inode *, struct writeback_control *);
122 extern void ext2_evict_inode(struct inode *);
123 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
124 extern int ext2_setattr (struct dentry *, struct iattr *);
125 extern void ext2_set_inode_flags(struct inode *inode);
126 extern void ext2_get_inode_flags(struct ext2_inode_info *);
127 extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
128 		       u64 start, u64 len);
129 
130 /* ioctl.c */
131 extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
132 extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
133 
134 /* namei.c */
135 struct dentry *ext2_get_parent(struct dentry *child);
136 
137 /* super.c */
138 extern __printf(3, 4)
139 void ext2_error(struct super_block *, const char *, const char *, ...);
140 extern __printf(3, 4)
141 void ext2_msg(struct super_block *, const char *, const char *, ...);
142 extern void ext2_update_dynamic_rev (struct super_block *sb);
143 extern void ext2_write_super (struct super_block *);
144 
145 /*
146  * Inodes and files operations
147  */
148 
149 /* dir.c */
150 extern const struct file_operations ext2_dir_operations;
151 
152 /* file.c */
153 extern int ext2_fsync(struct file *file, loff_t start, loff_t end,
154 		      int datasync);
155 extern const struct inode_operations ext2_file_inode_operations;
156 extern const struct file_operations ext2_file_operations;
157 extern const struct file_operations ext2_xip_file_operations;
158 
159 /* inode.c */
160 extern const struct address_space_operations ext2_aops;
161 extern const struct address_space_operations ext2_aops_xip;
162 extern const struct address_space_operations ext2_nobh_aops;
163 
164 /* namei.c */
165 extern const struct inode_operations ext2_dir_inode_operations;
166 extern const struct inode_operations ext2_special_inode_operations;
167 
168 /* symlink.c */
169 extern const struct inode_operations ext2_fast_symlink_inode_operations;
170 extern const struct inode_operations ext2_symlink_inode_operations;
171 
172 static inline ext2_fsblk_t
173 ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
174 {
175 	return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) +
176 		le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
177 }
178 
179 #define ext2_set_bit	__test_and_set_bit_le
180 #define ext2_clear_bit	__test_and_clear_bit_le
181 #define ext2_test_bit	test_bit_le
182 #define ext2_find_first_zero_bit	find_first_zero_bit_le
183 #define ext2_find_next_zero_bit		find_next_zero_bit_le
184