vfs: separate FMODE_PREAD/FMODE_PWRITE into separate flags

#define MAY_ACCESS 16

#define MAY_OPEN 32

/*

 * flags in file.f_mode.  Note that FMODE_READ and FMODE_WRITE must correspond

 * to O_WRONLY and O_RDWR via the strange trick in __dentry_open()

 */

/* file is open for reading */

#define FMODE_READ		((__force fmode_t)1)

/* file is open for writing */

#define FMODE_WRITE		((__force fmode_t)2)

/* file is seekable */

#define FMODE_LSEEK		((__force fmode_t)4)

/* file can be accessed using pread/pwrite */

/* file can be accessed using pread */

#define FMODE_PREAD		((__force fmode_t)8)

#define FMODE_PWRITE		FMODE_PREAD	/* These go hand in hand */

/* file can be accessed using pwrite */

#define FMODE_PWRITE		((__force fmode_t)16)

/* File is opened for execution with sys_execve / sys_uselib */

#define FMODE_EXEC		((__force fmode_t)16)

#define FMODE_EXEC		((__force fmode_t)32)

/* File is opened with O_NDELAY (only set for block devices) */

#define FMODE_NDELAY		((__force fmode_t)32)

#define FMODE_NDELAY		((__force fmode_t)64)

/* File is opened with O_EXCL (only set for block devices) */

#define FMODE_EXCL		((__force fmode_t)64)

#define FMODE_EXCL		((__force fmode_t)128)

/* File is opened using open(.., 3, ..) and is writeable only for ioctls

   (specialy hack for floppy.c) */

#define FMODE_WRITE_IOCTL	((__force fmode_t)128)

#define FMODE_WRITE_IOCTL	((__force fmode_t)256)

/*

 * Don't update ctime and mtime.