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authorChristoph Hellwig <hch@lst.de>2023-06-08 13:02:43 +0200
committerJens Axboe <axboe@kernel.dk>2023-06-12 16:04:04 +0200
commit2736e8eeb0ccdc71d1f4256c9c9a28f58cc43307 (patch)
tree756552135a5496bd16f644aad640a9e955d903b4 /block/fops.c
parentbtrfs: don't pass a holder for non-exclusive blkdev_get_by_path (diff)
downloadlinux-2736e8eeb0ccdc71d1f4256c9c9a28f58cc43307.tar.xz
linux-2736e8eeb0ccdc71d1f4256c9c9a28f58cc43307.zip
block: use the holder as indication for exclusive opens
The current interface for exclusive opens is rather confusing as it requires both the FMODE_EXCL flag and a holder. Remove the need to pass FMODE_EXCL and just key off the exclusive open off a non-NULL holder. For blkdev_put this requires adding the holder argument, which provides better debug checking that only the holder actually releases the hold, but at the same time allows removing the now superfluous mode argument. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Acked-by: Christian Brauner <brauner@kernel.org> Acked-by: David Sterba <dsterba@suse.com> [btrfs] Acked-by: Jack Wang <jinpu.wang@ionos.com> [rnbd] Link: https://lore.kernel.org/r/20230608110258.189493-16-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/fops.c')
-rw-r--r--block/fops.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/block/fops.c b/block/fops.c
index 26af2b39c758..9f26e25bafa1 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -490,7 +490,9 @@ static int blkdev_open(struct inode *inode, struct file *filp)
if ((filp->f_flags & O_ACCMODE) == 3)
filp->f_mode |= FMODE_WRITE_IOCTL;
- bdev = blkdev_get_by_dev(inode->i_rdev, filp->f_mode, filp, NULL);
+ bdev = blkdev_get_by_dev(inode->i_rdev, filp->f_mode,
+ (filp->f_mode & FMODE_EXCL) ? filp : NULL,
+ NULL);
if (IS_ERR(bdev))
return PTR_ERR(bdev);
@@ -504,7 +506,7 @@ static int blkdev_release(struct inode *inode, struct file *filp)
{
struct block_device *bdev = filp->private_data;
- blkdev_put(bdev, filp->f_mode);
+ blkdev_put(bdev, (filp->f_mode & FMODE_EXCL) ? filp : NULL);
return 0;
}