LCOV - code coverage report
Current view: top level - lkbce/fs/ext2 - ext2.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 15 15 100.0 %
Date: 2017-01-25 Functions: 2 2 100.0 %

          Line data    Source code
       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           1 : 
      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        4329 :         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_msg(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           1 : extern const struct file_operations ext2_dir_operations;
     156             : 
     157             : /* file.c */
     158             : extern int ext2_fsync(struct file *file, struct dentry *dentry, int datasync);
     159           1 : extern const struct inode_operations ext2_file_inode_operations;
     160           1 : extern const struct file_operations ext2_file_operations;
     161             : extern const struct file_operations ext2_xip_file_operations;
     162             : 
     163             : /* inode.c */
     164           1 : extern const struct address_space_operations ext2_aops;
     165           1 : extern const struct address_space_operations ext2_aops_xip;
     166           1 : extern const struct address_space_operations ext2_nobh_aops;
     167             : 
     168             : /* namei.c */
     169           1 : extern const struct inode_operations ext2_dir_inode_operations;
     170           1 : extern const struct inode_operations ext2_special_inode_operations;
     171             : 
     172             : /* symlink.c */
     173           1 : extern const struct inode_operations ext2_fast_symlink_inode_operations;
     174           1 : extern const struct inode_operations ext2_symlink_inode_operations;
     175             : 
     176             : static inline ext2_fsblk_t
     177             : ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
     178             : {
     179       19614 :         return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) +
     180        2802 :                 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
     181             : }

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