[PATCH 2/2] documnt FMODE_ constants

Make sure all FMODE_ constants are documents, and ensure a coherent
style for the already existing comments.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

include/linux/fs.h

@@ -63,21 +63,23 @@ extern int dir_notify_enable;
 #define MAY_ACCESS 16
 #define MAY_OPEN 32
 
-#define FMODE_READ ((__force fmode_t)1)
-#define FMODE_WRITE ((__force fmode_t)2)
-
-/* Internal kernel extensions */
-#define FMODE_LSEEK	((__force fmode_t)4)
-#define FMODE_PREAD	((__force fmode_t)8)
-#define FMODE_PWRITE	FMODE_PREAD	/* These go hand in hand */
-
-/* File is being opened for execution. Primary users of this flag are
-   distributed filesystems that can use it to achieve correct ETXTBUSY
-   behavior for cross-node execution/opening_for_writing of files */
-#define FMODE_EXEC	((__force fmode_t)16)
-
-#define FMODE_NDELAY	((__force fmode_t)32)
-#define FMODE_EXCL	((__force fmode_t)64)
+/* 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 */
+#define FMODE_PREAD		((__force fmode_t)8)
+#define FMODE_PWRITE		FMODE_PREAD	/* These go hand in hand */
+/* File is opened for execution with sys_execve / sys_uselib */
+#define FMODE_EXEC		((__force fmode_t)16)
+/* File is opened with O_NDELAY (only set for block devices) */
+#define FMODE_NDELAY		((__force fmode_t)32)
+/* File is opened with O_EXCL (only set for block devices) */
+#define FMODE_EXCL		((__force fmode_t)64)
+/* 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 RW_MASK		1