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[68.160.141.91]) by smtp.gmail.com with ESMTPSA id x10-20020ae9e90a000000b0078d6d22a0c3sm6383346qkf.90.2024.04.15.06.56.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Apr 2024 06:56:29 -0700 (PDT) Date: Mon, 15 Apr 2024 09:56:28 -0400 From: Mike Snitzer To: Christian Brauner Cc: Ming Lei , Jan Kara , Christoph Hellwig , Jens Axboe , "Darrick J. Wong" , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, dm-devel@lists.linux.dev, Mikulas Patocka Subject: Re: [PATCH v2 04/34] md: port block device access to file Message-ID: References: <20240123-vfs-bdev-file-v2-0-adbd023e19cc@kernel.org> <20240123-vfs-bdev-file-v2-4-adbd023e19cc@kernel.org> <20240415-haufen-demolieren-8c6da8159586@brauner> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240415-haufen-demolieren-8c6da8159586@brauner> On Mon, Apr 15 2024 at 8:35P -0400, Christian Brauner wrote: > On Mon, Apr 15, 2024 at 05:26:19PM +0800, Ming Lei wrote: > > Hello, > > > > On Tue, Jan 23, 2024 at 02:26:21PM +0100, Christian Brauner wrote: > > > Signed-off-by: Christian Brauner > > > --- > > > drivers/md/dm.c | 23 +++++++++++++---------- > > > drivers/md/md.c | 12 ++++++------ > > > drivers/md/md.h | 2 +- > > > include/linux/device-mapper.h | 2 +- > > > 4 files changed, 21 insertions(+), 18 deletions(-) > > > > > > diff --git a/drivers/md/dm.c b/drivers/md/dm.c > > > index 8dcabf84d866..87de5b5682ad 100644 > > > --- a/drivers/md/dm.c > > > +++ b/drivers/md/dm.c > > > > ... > > > > > @@ -775,7 +778,7 @@ static void close_table_device(struct table_device *td, struct mapped_device *md > > > { > > > if (md->disk->slave_dir) > > > bd_unlink_disk_holder(td->dm_dev.bdev, md->disk); > > > - bdev_release(td->dm_dev.bdev_handle); > > > + fput(td->dm_dev.bdev_file); > > > > The above change caused regression on 'dmsetup remove_all'. > > > > blkdev_release() is delayed because of fput(), so dm_lock_for_deletion > > returns -EBUSY, then this dm disk is skipped in remove_all(). > > > > Force to mark DMF_DEFERRED_REMOVE might solve it, but need our device > > mapper guys to check if it is safe. > > > > Or other better solution? > > Yeah, I think there is. You can just switch all fput() instances in > device mapper to bdev_fput() which is mainline now. This will yield the > device and make it able to be reclaimed. Should be as simple as the > patch below. Could you test this and send a patch based on this (I'm on > a prolonged vacation so I don't have time right now.): > > diff --git a/drivers/md/dm.c b/drivers/md/dm.c > index 56aa2a8b9d71..0f681a1e70af 100644 > --- a/drivers/md/dm.c > +++ b/drivers/md/dm.c > @@ -765,7 +765,7 @@ static struct table_device *open_table_device(struct mapped_device *md, > return td; > > out_blkdev_put: > - fput(bdev_file); > + bdev_fput(bdev_file); > out_free_td: > kfree(td); > return ERR_PTR(r); > @@ -778,7 +778,7 @@ static void close_table_device(struct table_device *td, struct mapped_device *md > { > if (md->disk->slave_dir) > bd_unlink_disk_holder(td->dm_dev.bdev, md->disk); > - fput(td->dm_dev.bdev_file); > + bdev_fput(td->dm_dev.bdev_file); > put_dax(td->dm_dev.dax_dev); > list_del(&td->list); > kfree(td); > > Thanks. I'll work with Ming and others to take care of it. Have a great vacation!