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[PATCH] fix floppy.c to store correct ro/rw status in underlying gendisk

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Evgeny Stambulchik found that doing the following always worked:

# mount /dev/fd0 /mnt/floppy/
mount: block device /dev/fd0 is write-protected, mounting read-only
# mount -o remount,rw /mnt/floppy
# echo $?
0

This is the case because the block device /dev/fd0 is writeable but the
floppy disk is marked protected.  A fix is to simply have floppy_open mark
the underlying gendisk policy according to reality (since the VFS doesn't
provide a way for do_remount_sb to inquire as to the current device
status).

Signed-off-by: Jon Masters <jcm@jonmasters.org>
Cc: Al Viro <viro@ftp.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jon Masters 2005-11-08 21:34:43 -08:00 committed by Linus Torvalds
parent 4448aaf0fa
commit 88baf3e85a
1 changed files with 6 additions and 0 deletions
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6
drivers/block/floppy.c
View file

@ -3714,6 +3714,12 @@ static int floppy_open(struct inode *inode, struct file *filp)
USETF(FD_VERIFY);
}
/* set underlying gendisk policy to reflect real ro/rw status */
if (UTESTF(FD_DISK_WRITABLE))
inode->i_bdev->bd_disk->policy = 0;
else
inode->i_bdev->bd_disk->policy = 1;
if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
goto out2;