fs/ext2/ext2.h

   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 ued 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         /*
  37          * i_next_alloc_block is the logical (file-relative) number of the
  38          * most-recently-allocated block in this file.  Yes, it is misnamed.
  39          * We use this for detecting linearly ascending allocation requests.
  40          */
  41         __u32   i_next_alloc_block;
  42
  43         /*
  44          * i_next_alloc_goal is the *physical* companion to i_next_alloc_block.
  45          * it the the physical block number of the block which was most-recently
  46          * allocated to this file.  This give us the goal (target) for the next
  47          * allocation when we detect linearly ascending requests.
  48          */
  49         __u32   i_next_alloc_goal;
  50         __u32   i_prealloc_block;
  51         __u32   i_prealloc_count;
  52         __u32   i_dir_start_lookup;
  53 #ifdef CONFIG_EXT2_FS_XATTR
  54         /*
  55          * Extended attributes can be read independently of the main file
  56          * data. Taking i_mutex even when reading would cause contention
  57          * between readers of EAs and writers of regular file data, so
  58          * instead we synchronize on xattr_sem when reading or changing
  59          * EAs.
  60          */
  61         struct rw_semaphore xattr_sem;
  62 #endif
  63 #ifdef CONFIG_EXT2_FS_POSIX_ACL
  64         struct posix_acl        *i_acl;
  65         struct posix_acl        *i_default_acl;
  66 #endif
  67         rwlock_t i_meta_lock;
  68         struct inode    vfs_inode;
  69 };
  70
  71 /*
  72  * Inode dynamic state flags
  73  */
  74 #define EXT2_STATE_NEW                  0x00000001 /* inode is newly created */
  75
  76
  77 /*
  78  * Function prototypes
  79  */
  80
  81 /*
  82  * Ok, these declarations are also in <linux/kernel.h> but none of the
  83  * ext2 source programs needs to include it so they are duplicated here.
  84  */
  85
  86 static inline struct ext2_inode_info *EXT2_I(struct inode *inode)
  87 {
  88         return container_of(inode, struct ext2_inode_info, vfs_inode);
  89 }
  90
  91 /* balloc.c */
  92 extern int ext2_bg_has_super(struct super_block *sb, int group);
  93 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
  94 extern int ext2_new_block (struct inode *, unsigned long,
  95                            __u32 *, __u32 *, int *);
  96 extern void ext2_free_blocks (struct inode *, unsigned long,
  97                               unsigned long);
  98 extern unsigned long ext2_count_free_blocks (struct super_block *);
  99 extern unsigned long ext2_count_dirs (struct super_block *);
 100 extern void ext2_check_blocks_bitmap (struct super_block *);
 101 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
 102                                                     unsigned int block_group,
 103                                                     struct buffer_head ** bh);
 104
 105 /* dir.c */
 106 extern int ext2_add_link (struct dentry *, struct inode *);
 107 extern ino_t ext2_inode_by_name(struct inode *, struct dentry *);
 108 extern int ext2_make_empty(struct inode *, struct inode *);
 109 extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct dentry *, struct page **);
 110 extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);
 111 extern int ext2_empty_dir (struct inode *);
 112 extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **);
 113 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *);
 114
 115 /* fsync.c */
 116 extern int ext2_sync_file (struct file *, struct dentry *, int);
 117
 118 /* ialloc.c */
 119 extern struct inode * ext2_new_inode (struct inode *, int);
 120 extern void ext2_free_inode (struct inode *);
 121 extern unsigned long ext2_count_free_inodes (struct super_block *);
 122 extern void ext2_check_inodes_bitmap (struct super_block *);
 123 extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
 124
 125 /* inode.c */
 126 extern void ext2_read_inode (struct inode *);
 127 extern int ext2_write_inode (struct inode *, int);
 128 extern void ext2_put_inode (struct inode *);
 129 extern void ext2_delete_inode (struct inode *);
 130 extern int ext2_sync_inode (struct inode *);
 131 extern void ext2_discard_prealloc (struct inode *);
 132 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
 133 extern void ext2_truncate (struct inode *);
 134 extern int ext2_setattr (struct dentry *, struct iattr *);
 135 extern void ext2_set_inode_flags(struct inode *inode);
 136
 137 /* ioctl.c */
 138 extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
 139                        unsigned long);
 140
 141 /* namei.c */
 142 struct dentry *ext2_get_parent(struct dentry *child);
 143
 144 /* super.c */
 145 extern void ext2_error (struct super_block *, const char *, const char *, ...)
 146         __attribute__ ((format (printf, 3, 4)));
 147 extern void ext2_warning (struct super_block *, const char *, const char *, ...)
 148         __attribute__ ((format (printf, 3, 4)));
 149 extern void ext2_update_dynamic_rev (struct super_block *sb);
 150 extern void ext2_write_super (struct super_block *);
 151
 152 /*
 153  * Inodes and files operations
 154  */
 155
 156 /* dir.c */
 157 extern const struct file_operations ext2_dir_operations;
 158
 159 /* file.c */
 160 extern struct inode_operations ext2_file_inode_operations;
 161 extern const struct file_operations ext2_file_operations;
 162 extern const struct file_operations ext2_xip_file_operations;
 163
 164 /* inode.c */
 165 extern struct address_space_operations ext2_aops;
 166 extern struct address_space_operations ext2_aops_xip;
 167 extern struct address_space_operations ext2_nobh_aops;
 168
 169 /* namei.c */
 170 extern struct inode_operations ext2_dir_inode_operations;
 171 extern struct inode_operations ext2_special_inode_operations;
 172
 173 /* symlink.c */
 174 extern struct inode_operations ext2_fast_symlink_inode_operations;
 175 extern struct inode_operations ext2_symlink_inode_operations;