164 lines
5.5 KiB
C
164 lines
5.5 KiB
C
#include <linux/fs.h>
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#include <linux/ext2_fs.h>
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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 ued 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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/*
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* i_next_alloc_block is the logical (file-relative) number of the
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* most-recently-allocated block in this file. Yes, it is misnamed.
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* We use this for detecting linearly ascending allocation requests.
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*/
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__u32 i_next_alloc_block;
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/*
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* i_next_alloc_goal is the *physical* companion to i_next_alloc_block.
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* it the the physical block number of the block which was most-recently
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* allocated to this file. This give us the goal (target) for the next
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* allocation when we detect linearly ascending requests.
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*/
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__u32 i_next_alloc_goal;
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__u32 i_prealloc_block;
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__u32 i_prealloc_count;
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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_sem 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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#ifdef CONFIG_EXT2_FS_POSIX_ACL
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struct posix_acl *i_acl;
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struct posix_acl *i_default_acl;
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#endif
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rwlock_t i_meta_lock;
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struct inode vfs_inode;
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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 int ext2_new_block (struct inode *, unsigned long,
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__u32 *, __u32 *, 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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/* 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 dentry *);
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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 dentry *, 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 *);
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/* fsync.c */
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extern int ext2_sync_file (struct file *, struct dentry *, 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 void ext2_read_inode (struct inode *);
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extern int ext2_write_inode (struct inode *, int);
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extern void ext2_put_inode (struct inode *);
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extern void ext2_delete_inode (struct inode *);
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extern int ext2_sync_inode (struct inode *);
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extern void ext2_discard_prealloc (struct inode *);
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extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
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extern void ext2_truncate (struct inode *);
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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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/* ioctl.c */
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extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
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unsigned long);
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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_warning (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 struct file_operations ext2_dir_operations;
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/* file.c */
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extern struct inode_operations ext2_file_inode_operations;
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extern struct file_operations ext2_file_operations;
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extern struct file_operations ext2_xip_file_operations;
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/* inode.c */
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extern struct address_space_operations ext2_aops;
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extern struct address_space_operations ext2_aops_xip;
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extern struct address_space_operations ext2_nobh_aops;
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/* namei.c */
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extern struct inode_operations ext2_dir_inode_operations;
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extern struct inode_operations ext2_special_inode_operations;
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/* symlink.c */
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extern struct inode_operations ext2_fast_symlink_inode_operations;
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extern struct inode_operations ext2_symlink_inode_operations;
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