LXR linux/fs/ext2/ext2.h

   1#include <linux/fs.h>
   2#include <linux/ext2_fs.h>
   3
   4/*
   5 * ext2 mount options
   6 */
   7struct 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 */
  16struct 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        /* 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#ifdef CONFIG_EXT2_FS_POSIX_ACL
  51        struct posix_acl        *i_acl;
  52        struct posix_acl        *i_default_acl;
  53#endif
  54        rwlock_t i_meta_lock;
  55
  56        /*
  57         * truncate_mutex is for serialising ext2_truncate() against
  58         * ext2_getblock().  It also protects the internals of the inode's
  59         * reservation data structures: ext2_reserve_window and
  60         * ext2_reserve_window_node.
  61         */
  62        struct mutex truncate_mutex;
  63        struct inode    vfs_inode;
  64        struct list_head i_orphan;      /* unlinked but open inodes */
  65};
  66
  67/*
  68 * Inode dynamic state flags
  69 */
  70#define EXT2_STATE_NEW                  0x00000001 /* inode is newly created */
  71
  72
  73/*
  74 * Function prototypes
  75 */
  76
  77/*
  78 * Ok, these declarations are also in <linux/kernel.h> but none of the
  79 * ext2 source programs needs to include it so they are duplicated here.
  80 */
  81
  82static inline struct ext2_inode_info *EXT2_I(struct inode *inode)
  83{
  84        return container_of(inode, struct ext2_inode_info, vfs_inode);
  85}
  86
  87/* balloc.c */
  88extern int ext2_bg_has_super(struct super_block *sb, int group);
  89extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
  90extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *);
  91extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,
  92                                unsigned long *, int *);
  93extern void ext2_free_blocks (struct inode *, unsigned long,
  94                              unsigned long);
  95extern unsigned long ext2_count_free_blocks (struct super_block *);
  96extern unsigned long ext2_count_dirs (struct super_block *);
  97extern void ext2_check_blocks_bitmap (struct super_block *);
  98extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
  99                                                    unsigned int block_group,
 100                                                    struct buffer_head ** bh);
 101extern void ext2_discard_reservation (struct inode *);
 102extern int ext2_should_retry_alloc(struct super_block *sb, int *retries);
 103extern void ext2_init_block_alloc_info(struct inode *);
 104extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
 105
 106/* dir.c */
 107extern int ext2_add_link (struct dentry *, struct inode *);
 108extern ino_t ext2_inode_by_name(struct inode *, struct dentry *);
 109extern int ext2_make_empty(struct inode *, struct inode *);
 110extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct dentry *, struct page **);
 111extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);
 112extern int ext2_empty_dir (struct inode *);
 113extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **);
 114extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *);
 115
 116/* fsync.c */
 117extern int ext2_sync_file (struct file *, struct dentry *, int);
 118
 119/* ialloc.c */
 120extern struct inode * ext2_new_inode (struct inode *, int);
 121extern void ext2_free_inode (struct inode *);
 122extern unsigned long ext2_count_free_inodes (struct super_block *);
 123extern void ext2_check_inodes_bitmap (struct super_block *);
 124extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
 125
 126/* inode.c */
 127extern void ext2_read_inode (struct inode *);
 128extern int ext2_write_inode (struct inode *, int);
 129extern void ext2_put_inode (struct inode *);
 130extern void ext2_delete_inode (struct inode *);
 131extern int ext2_sync_inode (struct inode *);
 132extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
 133extern void ext2_truncate (struct inode *);
 134extern int ext2_setattr (struct dentry *, struct iattr *);
 135extern void ext2_set_inode_flags(struct inode *inode);
 136extern void ext2_get_inode_flags(struct ext2_inode_info *);
 137int __ext2_write_begin(struct file *file, struct address_space *mapping,
 138                loff_t pos, unsigned len, unsigned flags,
 139                struct page **pagep, void **fsdata);
 140
 141/* ioctl.c */
 142extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
 143                       unsigned long);
 144extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
 145
 146/* namei.c */
 147struct dentry *ext2_get_parent(struct dentry *child);
 148
 149/* super.c */
 150extern void ext2_error (struct super_block *, const char *, const char *, ...)
 151        __attribute__ ((format (printf, 3, 4)));
 152extern void ext2_warning (struct super_block *, const char *, const char *, ...)
 153        __attribute__ ((format (printf, 3, 4)));
 154extern void ext2_update_dynamic_rev (struct super_block *sb);
 155extern void ext2_write_super (struct super_block *);
 156
 157/*
 158 * Inodes and files operations
 159 */
 160
 161/* dir.c */
 162extern const struct file_operations ext2_dir_operations;
 163
 164/* file.c */
 165extern const struct inode_operations ext2_file_inode_operations;
 166extern const struct file_operations ext2_file_operations;
 167extern const struct file_operations ext2_xip_file_operations;
 168
 169/* inode.c */
 170extern const struct address_space_operations ext2_aops;
 171extern const struct address_space_operations ext2_aops_xip;
 172extern const struct address_space_operations ext2_nobh_aops;
 173
 174/* namei.c */
 175extern const struct inode_operations ext2_dir_inode_operations;
 176extern const struct inode_operations ext2_special_inode_operations;
 177
 178/* symlink.c */
 179extern const struct inode_operations ext2_fast_symlink_inode_operations;
 180extern const struct inode_operations ext2_symlink_inode_operations;
 181
 182static inline ext2_fsblk_t
 183ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
 184{
 185        return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) +
 186                le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
 187}
 188