[PATCH 1/2] kill FMODE_NDELAY_NOW

Update FMODE_NDELAY before each ioctl call so that we can kill the
magic FMODE_NDELAY_NOW. It would be even better to do this directly
in setfl(), but for that we'd need to have FMODE_NDELAY for all files,
not just block special files.

Signed-off-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Al Viro <[e-mail]>

block/compat_ioctl.c

···
 	struct backing_dev_info *bdi;
 	loff_t size;
 
+	/*
+	 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
+	 * to updated it before every ioctl.
+	 */
 	if (file->f_flags & O_NDELAY)
-		mode |= FMODE_NDELAY_NOW;
+		mode |= FMODE_NDELAY;
+	else
+		mode &= ~FMODE_NDELAY;
 
 	switch (cmd) {
 	case HDIO_GETGEO:

drivers/scsi/sd.c

···
 	 * access to the device is prohibited.
 	 */
 	error = scsi_nonblockable_ioctl(sdp, cmd, p,
-					(mode & FMODE_NDELAY_NOW) != 0);
+					(mode & FMODE_NDELAY) != 0);
 	if (!scsi_block_when_processing_errors(sdp) || !error)
 		return error;
 

drivers/scsi/sr.c

···
 	 * if it doesn't recognise the ioctl
 	 */
 	ret = scsi_nonblockable_ioctl(sdev, cmd, argp,
-					(mode & FMODE_NDELAY_NOW) != 0);
+					(mode & FMODE_NDELAY) != 0);
 	if (ret != -ENODEV)
 		return ret;
 	return scsi_ioctl(sdev, cmd, argp);

fs/block_dev.c

···
 {
 	struct block_device *bdev = I_BDEV(file->f_mapping->host);
 	fmode_t mode = file->f_mode;
+
+	/*
+	 * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
+	 * to updated it before every ioctl.
+	 */
 	if (file->f_flags & O_NDELAY)
-		mode |= FMODE_NDELAY_NOW;
+		mode |= FMODE_NDELAY;
+	else
+		mode &= ~FMODE_NDELAY;
+
 	return blkdev_ioctl(bdev, mode, cmd, arg);
 }
 

include/linux/fs.h

···
 #define FMODE_NDELAY	((__force fmode_t)32)
 #define FMODE_EXCL	((__force fmode_t)64)
 #define FMODE_WRITE_IOCTL	((__force fmode_t)128)
-#define FMODE_NDELAY_NOW	((__force fmode_t)256)
 
 #define RW_MASK		1
 #define RWA_MASK	2