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 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);
 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 *, int);
 122 extern void ext2_delete_inode (struct inode *);
 123 extern int ext2_sync_inode (struct inode *);
 124 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
 125 extern void ext2_truncate (struct inode *);
 126 extern int ext2_setattr (struct dentry *, struct iattr *);
 127 extern void ext2_set_inode_flags(struct inode *inode);
 128 extern void ext2_get_inode_flags(struct ext2_inode_info *);
 129 extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 130                        u64 start, u64 len);
 131 int __ext2_write_begin(struct file *file, struct address_space *mapping,
 132                 loff_t pos, unsigned len, unsigned flags,
 133                 struct page **pagep, void **fsdata);
 134
 135 /* ioctl.c */
 136 extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
 137 extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
 138
 139 /* namei.c */
 140 struct dentry *ext2_get_parent(struct dentry *child);
 141
 142 /* super.c */
 143 extern void ext2_error (struct super_block *, const char *, const char *, ...)
 144         __attribute__ ((format (printf, 3, 4)));
 145 extern void ext2_warning (struct super_block *, const char *, const char *, ...)
 146         __attribute__ ((format (printf, 3, 4)));
 147 extern void ext2_update_dynamic_rev (struct super_block *sb);
 148 extern void ext2_write_super (struct super_block *);
 149
 150 /*
 151  * Inodes and files operations
 152  */
 153
 154 /* dir.c */
 155 extern const struct file_operations ext2_dir_operations;
 156
 157 /* file.c */
 158 extern const struct inode_operations ext2_file_inode_operations;
 159 extern const struct file_operations ext2_file_operations;
 160 extern const struct file_operations ext2_xip_file_operations;
 161
 162 /* inode.c */
 163 extern const struct address_space_operations ext2_aops;
 164 extern const struct address_space_operations ext2_aops_xip;
 165 extern const struct address_space_operations ext2_nobh_aops;
 166
 167 /* namei.c */
 168 extern const struct inode_operations ext2_dir_inode_operations;
 169 extern const struct inode_operations ext2_special_inode_operations;
 170
 171 /* symlink.c */
 172 extern const struct inode_operations ext2_fast_symlink_inode_operations;
 173 extern const struct inode_operations ext2_symlink_inode_operations;
 174
 175 static inline ext2_fsblk_t
 176 ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
 177 {
 178         return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) +
 179                 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
 180 }