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 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
  78static 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 */
  84extern int ext2_bg_has_super(struct super_block *sb, int group);
  85extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
  86extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *);
  87extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,
  88                                unsigned long *, int *);
  89extern void ext2_free_blocks (struct inode *, unsigned long,
  90                              unsigned long);
  91extern unsigned long ext2_count_free_blocks (struct super_block *);
  92extern unsigned long ext2_count_dirs (struct super_block *);
  93extern void ext2_check_blocks_bitmap (struct super_block *);
  94extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
  95                                                    unsigned int block_group,
  96                                                    struct buffer_head ** bh);
  97extern void ext2_discard_reservation (struct inode *);
  98extern int ext2_should_retry_alloc(struct super_block *sb, int *retries);
  99extern void ext2_init_block_alloc_info(struct inode *);
 100extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
 101
 102/* dir.c */
 103extern int ext2_add_link (struct dentry *, struct inode *);
 104extern ino_t ext2_inode_by_name(struct inode *, struct qstr *);
 105extern int ext2_make_empty(struct inode *, struct inode *);
 106extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct qstr *, struct page **);
 107extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);
 108extern int ext2_empty_dir (struct inode *);
 109extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **);
 110extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *, int);
 111
 112/* ialloc.c */
 113extern struct inode * ext2_new_inode (struct inode *, int);
 114extern void ext2_free_inode (struct inode *);
 115extern unsigned long ext2_count_free_inodes (struct super_block *);
 116extern void ext2_check_inodes_bitmap (struct super_block *);
 117extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
 118
 119/* inode.c */
 120extern struct inode *ext2_iget (struct super_block *, unsigned long);
 121extern int ext2_write_inode (struct inode *, int);
 122extern void ext2_delete_inode (struct inode *);
 123extern int ext2_sync_inode (struct inode *);
 124extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
 125extern void ext2_truncate (struct inode *);
 126extern int ext2_setattr (struct dentry *, struct iattr *);
 127extern void ext2_set_inode_flags(struct inode *inode);
 128extern void ext2_get_inode_flags(struct ext2_inode_info *);
 129extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 130                       u64 start, u64 len);
 131int __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 */
 136extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
 137extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
 138
 139/* namei.c */
 140struct dentry *ext2_get_parent(struct dentry *child);
 141
 142/* super.c */
 143extern void ext2_error (struct super_block *, const char *, const char *, ...)
 144        __attribute__ ((format (printf, 3, 4)));
 145extern void ext2_warning (struct super_block *, const char *, const char *, ...)
 146        __attribute__ ((format (printf, 3, 4)));
 147extern void ext2_update_dynamic_rev (struct super_block *sb);
 148extern void ext2_write_super (struct super_block *);
 149
 150/*
 151 * Inodes and files operations
 152 */
 153
 154/* dir.c */
 155extern const struct file_operations ext2_dir_operations;
 156
 157/* file.c */
 158extern const struct inode_operations ext2_file_inode_operations;
 159extern const struct file_operations ext2_file_operations;
 160extern const struct file_operations ext2_xip_file_operations;
 161
 162/* inode.c */
 163extern const struct address_space_operations ext2_aops;
 164extern const struct address_space_operations ext2_aops_xip;
 165extern const struct address_space_operations ext2_nobh_aops;
 166
 167/* namei.c */
 168extern const struct inode_operations ext2_dir_inode_operations;
 169extern const struct inode_operations ext2_special_inode_operations;
 170
 171/* symlink.c */
 172extern const struct inode_operations ext2_fast_symlink_inode_operations;
 173extern const struct inode_operations ext2_symlink_inode_operations;
 174
 175static inline ext2_fsblk_t
 176ext2_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}
 181