fs/ext2/ext2.h

   1 #include <linux/fs.h>
   2 #include <linux/ext2_fs.h>
   3
   4 /*
   5  * second extended file system inode data in memory
   6  */
   7 struct ext2_inode_info {
   8         __le32  i_data[15];
   9         __u32   i_flags;
  10         __u32   i_faddr;
  11         __u8    i_frag_no;
  12         __u8    i_frag_size;
  13         __u16   i_state;
  14         __u32   i_file_acl;
  15         __u32   i_dir_acl;
  16         __u32   i_dtime;
  17
  18         /*
  19          * i_block_group is the number of the block group which contains
  20          * this file's inode.  Constant across the lifetime of the inode,
  21          * it is ued for making block allocation decisions - we try to
  22          * place a file's data blocks near its inode block, and new inodes
  23          * near to their parent directory's inode.
  24          */
  25         __u32   i_block_group;
  26
  27         /*
  28          * i_next_alloc_block is the logical (file-relative) number of the
  29          * most-recently-allocated block in this file.  Yes, it is misnamed.
  30          * We use this for detecting linearly ascending allocation requests.
  31          */
  32         __u32   i_next_alloc_block;
  33
  34         /*
  35          * i_next_alloc_goal is the *physical* companion to i_next_alloc_block.
  36          * it the the physical block number of the block which was most-recently
  37          * allocated to this file.  This give us the goal (target) for the next
  38          * allocation when we detect linearly ascending requests.
  39          */
  40         __u32   i_next_alloc_goal;
  41         __u32   i_prealloc_block;
  42         __u32   i_prealloc_count;
  43         __u32   i_dir_start_lookup;
  44 #ifdef CONFIG_EXT2_FS_XATTR
  45         /*
  46          * Extended attributes can be read independently of the main file
  47          * data. Taking i_sem even when reading would cause contention
  48          * between readers of EAs and writers of regular file data, so
  49          * instead we synchronize on xattr_sem when reading or changing
  50          * EAs.
  51          */
  52         struct rw_semaphore xattr_sem;
  53 #endif
  54 #ifdef CONFIG_EXT2_FS_POSIX_ACL
  55         struct posix_acl        *i_acl;
  56         struct posix_acl        *i_default_acl;
  57 #endif
  58         rwlock_t i_meta_lock;
  59         struct inode    vfs_inode;
  60 };
  61
  62 /*
  63  * Inode dynamic state flags
  64  */
  65 #define EXT2_STATE_NEW                  0x00000001 /* inode is newly created */
  66
  67
  68 /*
  69  * Function prototypes
  70  */
  71
  72 /*
  73  * Ok, these declarations are also in <linux/kernel.h> but none of the
  74  * ext2 source programs needs to include it so they are duplicated here.
  75  */
  76
  77 static inline struct ext2_inode_info *EXT2_I(struct inode *inode)
  78 {
  79         return container_of(inode, struct ext2_inode_info, vfs_inode);
  80 }
  81
  82 /* balloc.c */
  83 extern int ext2_bg_has_super(struct super_block *sb, int group);
  84 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
  85 extern int ext2_new_block (struct inode *, unsigned long,
  86                            __u32 *, __u32 *, int *);
  87 extern void ext2_free_blocks (struct inode *, unsigned long,
  88                               unsigned long);
  89 extern unsigned long ext2_count_free_blocks (struct super_block *);
  90 extern unsigned long ext2_count_dirs (struct super_block *);
  91 extern void ext2_check_blocks_bitmap (struct super_block *);
  92 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
  93                                                     unsigned int block_group,
  94                                                     struct buffer_head ** bh);
  95
  96 /* dir.c */
  97 extern int ext2_add_link (struct dentry *, struct inode *);
  98 extern ino_t ext2_inode_by_name(struct inode *, struct dentry *);
  99 extern int ext2_make_empty(struct inode *, struct inode *);
 100 extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct dentry *, struct page **);
 101 extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);
 102 extern int ext2_empty_dir (struct inode *);
 103 extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **);
 104 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *);
 105
 106 /* fsync.c */
 107 extern int ext2_sync_file (struct file *, struct dentry *, int);
 108
 109 /* ialloc.c */
 110 extern struct inode * ext2_new_inode (struct inode *, int);
 111 extern void ext2_free_inode (struct inode *);
 112 extern unsigned long ext2_count_free_inodes (struct super_block *);
 113 extern void ext2_check_inodes_bitmap (struct super_block *);
 114 extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
 115
 116 /* inode.c */
 117 extern void ext2_read_inode (struct inode *);
 118 extern int ext2_write_inode (struct inode *, int);
 119 extern void ext2_delete_inode (struct inode *);
 120 extern int ext2_sync_inode (struct inode *);
 121 extern void ext2_discard_prealloc (struct inode *);
 122 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
 123 extern void ext2_truncate (struct inode *);
 124 extern int ext2_setattr (struct dentry *, struct iattr *);
 125 extern void ext2_set_inode_flags(struct inode *inode);
 126
 127 /* ioctl.c */
 128 extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
 129                        unsigned long);
 130
 131 /* super.c */
 132 extern void ext2_error (struct super_block *, const char *, const char *, ...)
 133         __attribute__ ((format (printf, 3, 4)));
 134 extern void ext2_warning (struct super_block *, const char *, const char *, ...)
 135         __attribute__ ((format (printf, 3, 4)));
 136 extern void ext2_update_dynamic_rev (struct super_block *sb);
 137 extern void ext2_write_super (struct super_block *);
 138
 139 /*
 140  * Inodes and files operations
 141  */
 142
 143 /* dir.c */
 144 extern struct file_operations ext2_dir_operations;
 145
 146 /* file.c */
 147 extern struct inode_operations ext2_file_inode_operations;
 148 extern struct file_operations ext2_file_operations;
 149
 150 /* inode.c */
 151 extern struct address_space_operations ext2_aops;
 152 extern struct address_space_operations ext2_nobh_aops;
 153
 154 /* namei.c */
 155 extern struct inode_operations ext2_dir_inode_operations;
 156 extern struct inode_operations ext2_special_inode_operations;
 157
 158 /* symlink.c */
 159 extern struct inode_operations ext2_fast_symlink_inode_operations;
 160 extern struct inode_operations ext2_symlink_inode_operations;