The patch titled
Subject: floppy: remove floppy-specific O_EXCL handling
has been removed from the -mm tree. Its filename was
floppy-remove-floppy-specific-o_excl-handling.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
From: Jiri Kosina <jkosina@xxxxxxx>
Subject: floppy: remove floppy-specific O_EXCL handling
Block layer now handles O_EXCL in a generic way for block devices.
The semantics is however different for floppy and all other block devices,
as floppy driver contains its own O_EXCL handling.
The semantics for all-but-floppy bdevs is "there can be at most one O_EXCL
open of this file", while for floppy bdev the semantics is "if someone has
the bdev open with O_EXCL, noone else can open it".
There is actual userspace-observable change in behavior because of this
since commit e525fd89d380c ("block: make blkdev_get/put() handle exclusive
access") -- on kernels containing this commit, mount of /dev/fd0 causes
the fd0 block device be claimed with _EXCL, preventing subsequent
open(/dev/fd0).
Bring things back into shape, i.e. make it possible, analogically to
other block devices, to mount the floppy and open() it afterwards --
remove the floppy-specific handling and let the generic bdev code O_EXCL
handling take over.
Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/floppy.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)
diff -puN drivers/block/floppy.c~floppy-remove-floppy-specific-o_excl-handling drivers/block/floppy.c
--- a/drivers/block/floppy.c~floppy-remove-floppy-specific-o_excl-handling
+++ a/drivers/block/floppy.c
@@ -3650,13 +3650,7 @@ static int floppy_open(struct block_devi
set_bit(FD_VERIFY_BIT, &UDRS->flags);
}
- if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (mode & FMODE_EXCL)))
- goto out2;
-
- if (mode & FMODE_EXCL)
- UDRS->fd_ref = -1;
- else
- UDRS->fd_ref++;
+ UDRS->fd_ref++;
opened_bdev[drive] = bdev;
_
Patches currently in -mm which might be from jkosina@xxxxxxx are
origin.patch
linux-next.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
