hostfs.h

linux 内核源代码

#ifndef __UM_FS_HOSTFS
#define __UM_FS_HOSTFS

#include "os.h"

/*
 * These are exactly the same definitions as in fs.h, but the names are
 * changed so that this file can be included in both kernel and user files.
 */

#define HOSTFS_ATTR_MODE	1
#define HOSTFS_ATTR_UID 	2
#define HOSTFS_ATTR_GID 	4
#define HOSTFS_ATTR_SIZE	8
#define HOSTFS_ATTR_ATIME	16
#define HOSTFS_ATTR_MTIME	32
#define HOSTFS_ATTR_CTIME	64
#define HOSTFS_ATTR_ATIME_SET	128
#define HOSTFS_ATTR_MTIME_SET	256

/* These two are unused by hostfs. */
#define HOSTFS_ATTR_FORCE	512	/* Not a change, but a change it */
#define HOSTFS_ATTR_ATTR_FLAG	1024

/*
 * If you are very careful, you'll notice that these two are missing:
 *
 * #define ATTR_KILL_SUID	2048
 * #define ATTR_KILL_SGID	4096
 *
 * and this is because they were added in 2.5 development in this patch:
 *
 * http://linux.bkbits.net:8080/linux-2.5/
 * cset@3caf4a12k4XgDzK7wyK-TGpSZ9u2Ww?nav=index.html
 * |src/.|src/include|src/include/linux|related/include/linux/fs.h
 *
 * Actually, they are not needed by most ->setattr() methods - they are set by
 * callers of notify_change() to notify that the setuid/setgid bits must be
 * dropped.
 * notify_change() will delete those flags, make sure attr->ia_valid & ATTR_MODE
 * is on, and remove the appropriate bits from attr->ia_mode (attr is a
 * "struct iattr *"). -BlaisorBlade
 */

struct hostfs_iattr {
	unsigned int	ia_valid;
	mode_t		ia_mode;
	uid_t		ia_uid;
	gid_t		ia_gid;
	loff_t		ia_size;
	struct timespec	ia_atime;
	struct timespec	ia_mtime;
	struct timespec	ia_ctime;
};

extern int stat_file(const char *path, unsigned long long *inode_out,
		     int *mode_out, int *nlink_out, int *uid_out, int *gid_out,
		     unsigned long long *size_out, struct timespec *atime_out,
		     struct timespec *mtime_out, struct timespec *ctime_out,
		     int *blksize_out, unsigned long long *blocks_out, int fd);
extern int access_file(char *path, int r, int w, int x);
extern int open_file(char *path, int r, int w, int append);
extern int file_type(const char *path, int *maj, int *min);
extern void *open_dir(char *path, int *err_out);
extern char *read_dir(void *stream, unsigned long long *pos,
		      unsigned long long *ino_out, int *len_out);
extern void close_file(void *stream);
extern void close_dir(void *stream);
extern int read_file(int fd, unsigned long long *offset, char *buf, int len);
extern int write_file(int fd, unsigned long long *offset, const char *buf,
		      int len);
extern int lseek_file(int fd, long long offset, int whence);
extern int fsync_file(int fd, int datasync);
extern int file_create(char *name, int ur, int uw, int ux, int gr,
		       int gw, int gx, int or, int ow, int ox);
extern int set_attr(const char *file, struct hostfs_iattr *attrs, int fd);
extern int make_symlink(const char *from, const char *to);
extern int unlink_file(const char *file);
extern int do_mkdir(const char *file, int mode);
extern int do_rmdir(const char *file);
extern int do_mknod(const char *file, int mode, unsigned int major,
		    unsigned int minor);
extern int link_file(const char *from, const char *to);
extern int do_readlink(char *file, char *buf, int size);
extern int rename_file(char *from, char *to);
extern int do_statfs(char *root, long *bsize_out, long long *blocks_out,
		     long long *bfree_out, long long *bavail_out,
		     long long *files_out, long long *ffree_out,
		     void *fsid_out, int fsid_size, long *namelen_out,
		     long *spare_out);

#endif