177 lines
6.1 KiB
C
177 lines
6.1 KiB
C
#include <linux/fs.h>
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#include <linux/ext2_fs.h>
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/*
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* ext2 mount options
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*/
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struct ext2_mount_options {
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unsigned long s_mount_opt;
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uid_t s_resuid;
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gid_t s_resgid;
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};
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/*
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* second extended file system inode data in memory
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*/
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struct ext2_inode_info {
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__le32 i_data[15];
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__u32 i_flags;
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__u32 i_faddr;
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__u8 i_frag_no;
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__u8 i_frag_size;
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__u16 i_state;
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__u32 i_file_acl;
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__u32 i_dir_acl;
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__u32 i_dtime;
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/*
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* i_block_group is the number of the block group which contains
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* this file's inode. Constant across the lifetime of the inode,
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* it is used for making block allocation decisions - we try to
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* place a file's data blocks near its inode block, and new inodes
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* near to their parent directory's inode.
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*/
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__u32 i_block_group;
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/* block reservation info */
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struct ext2_block_alloc_info *i_block_alloc_info;
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__u32 i_dir_start_lookup;
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#ifdef CONFIG_EXT2_FS_XATTR
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/*
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* Extended attributes can be read independently of the main file
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* data. Taking i_mutex even when reading would cause contention
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* between readers of EAs and writers of regular file data, so
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* instead we synchronize on xattr_sem when reading or changing
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* EAs.
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*/
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struct rw_semaphore xattr_sem;
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#endif
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rwlock_t i_meta_lock;
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/*
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* truncate_mutex is for serialising ext2_truncate() against
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* ext2_getblock(). It also protects the internals of the inode's
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* reservation data structures: ext2_reserve_window and
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* ext2_reserve_window_node.
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*/
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struct mutex truncate_mutex;
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struct inode vfs_inode;
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struct list_head i_orphan; /* unlinked but open inodes */
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};
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/*
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* Inode dynamic state flags
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*/
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#define EXT2_STATE_NEW 0x00000001 /* inode is newly created */
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/*
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* Function prototypes
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*/
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/*
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* Ok, these declarations are also in <linux/kernel.h> but none of the
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* ext2 source programs needs to include it so they are duplicated here.
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*/
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static inline struct ext2_inode_info *EXT2_I(struct inode *inode)
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{
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return container_of(inode, struct ext2_inode_info, vfs_inode);
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}
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/* balloc.c */
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extern int ext2_bg_has_super(struct super_block *sb, int group);
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extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
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extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *);
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extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,
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unsigned long *, int *);
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extern void ext2_free_blocks (struct inode *, unsigned long,
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unsigned long);
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extern unsigned long ext2_count_free_blocks (struct super_block *);
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extern unsigned long ext2_count_dirs (struct super_block *);
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extern void ext2_check_blocks_bitmap (struct super_block *);
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extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
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unsigned int block_group,
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struct buffer_head ** bh);
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extern void ext2_discard_reservation (struct inode *);
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extern int ext2_should_retry_alloc(struct super_block *sb, int *retries);
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extern void ext2_init_block_alloc_info(struct inode *);
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extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
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/* dir.c */
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extern int ext2_add_link (struct dentry *, struct inode *);
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extern ino_t ext2_inode_by_name(struct inode *, struct qstr *);
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extern int ext2_make_empty(struct inode *, struct inode *);
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extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct qstr *, struct page **);
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extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);
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extern int ext2_empty_dir (struct inode *);
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extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **);
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extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *, int);
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/* ialloc.c */
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extern struct inode * ext2_new_inode (struct inode *, int);
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extern void ext2_free_inode (struct inode *);
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extern unsigned long ext2_count_free_inodes (struct super_block *);
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extern void ext2_check_inodes_bitmap (struct super_block *);
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extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
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/* inode.c */
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extern struct inode *ext2_iget (struct super_block *, unsigned long);
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extern int ext2_write_inode (struct inode *, struct writeback_control *);
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extern void ext2_evict_inode(struct inode *);
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extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
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extern int ext2_setattr (struct dentry *, struct iattr *);
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extern void ext2_set_inode_flags(struct inode *inode);
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extern void ext2_get_inode_flags(struct ext2_inode_info *);
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extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
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u64 start, u64 len);
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/* ioctl.c */
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extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
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extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
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/* namei.c */
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struct dentry *ext2_get_parent(struct dentry *child);
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/* super.c */
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extern void ext2_error (struct super_block *, const char *, const char *, ...)
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__attribute__ ((format (printf, 3, 4)));
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extern void ext2_msg(struct super_block *, const char *, const char *, ...)
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__attribute__ ((format (printf, 3, 4)));
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extern void ext2_update_dynamic_rev (struct super_block *sb);
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extern void ext2_write_super (struct super_block *);
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/*
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* Inodes and files operations
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*/
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/* dir.c */
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extern const struct file_operations ext2_dir_operations;
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/* file.c */
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extern int ext2_fsync(struct file *file, int datasync);
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extern const struct inode_operations ext2_file_inode_operations;
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extern const struct file_operations ext2_file_operations;
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extern const struct file_operations ext2_xip_file_operations;
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/* inode.c */
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extern const struct address_space_operations ext2_aops;
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extern const struct address_space_operations ext2_aops_xip;
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extern const struct address_space_operations ext2_nobh_aops;
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/* namei.c */
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extern const struct inode_operations ext2_dir_inode_operations;
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extern const struct inode_operations ext2_special_inode_operations;
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/* symlink.c */
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extern const struct inode_operations ext2_fast_symlink_inode_operations;
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extern const struct inode_operations ext2_symlink_inode_operations;
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static inline ext2_fsblk_t
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ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
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{
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return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) +
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le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
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}
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