From: Christoph Hellwig <hch@infradead.org>
To: "Matias Bjørling" <m@bjorling.me>
Cc: axboe@fb.com, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org, Rakesh Pandit <rakesh@tuxera.com>
Subject: Re: [GIT PULL 02/58] lightnvm: prevent bd removal if busy
Date: Fri, 13 Oct 2017 07:58:09 -0700 [thread overview]
Message-ID: <20171013145809.GA16745@infradead.org> (raw)
In-Reply-To: <20171013124647.32668-3-m@bjorling.me>
On Fri, Oct 13, 2017 at 02:45:51PM +0200, Matias Bjørling wrote:
> From: Rakesh Pandit <rakesh@tuxera.com>
>
> When a virtual block device is formatted and mounted after creating
> with "nvme lnvm create... -t pblk", a removal from "nvm lnvm remove"
> would result in this:
>
> 446416.309757] bdi-block not registered
> [446416.309773] ------------[ cut here ]------------
> [446416.309780] WARNING: CPU: 3 PID: 4319 at fs/fs-writeback.c:2159
> __mark_inode_dirty+0x268/0x340
>
> Ideally removal should return -EBUSY as block device is mounted after
> formatting. This patch tries to address this checking if whole device
> or any partition of it already mounted or not before removal.
How is this different from any other block device that can be
removed even if a file system is mounted?
>
> Whole device is checked using "bd_super" member of block device. This
> member is always set once block device has been mounted using a
> filesystem. Another member "bd_part_count" takes care of checking any
> if any partitions are under use. "bd_part_count" is only updated
> under locks when partitions are opened or closed (first open and last
> release). This at least does take care sending -EBUSY if removal is
> being attempted while whole block device or any partition is mounted.
>
That's a massive layering violation, and a driver has no business
looking at these fields.
next prev parent reply other threads:[~2017-10-13 14:58 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-13 12:45 [GIT PULL 00/58] LightNVM updates for 4.15 Matias Bjørling
2017-10-13 12:45 ` [GIT PULL 01/58] lightnvm: prevent target type module removal when in use Matias Bjørling
2017-10-13 12:45 ` [GIT PULL 02/58] lightnvm: prevent bd removal if busy Matias Bjørling
2017-10-13 14:58 ` Christoph Hellwig [this message]
2017-10-13 15:35 ` Rakesh Pandit
2017-10-13 15:58 ` Javier González
2017-10-14 6:04 ` Javier González
2017-10-16 15:14 ` Matias Bjørling
2017-10-13 12:45 ` [GIT PULL 03/58] lightnvm: protect target type list with correct locks Matias Bjørling
2017-10-13 12:45 ` [GIT PULL 04/58] lightnvm: remove already calculated nr_chnls Matias Bjørling
2017-10-13 12:45 ` [GIT PULL 05/58] lightnvm: pblk: fix error path in pblk_lines_alloc_metadata Matias Bjørling
2017-10-13 12:45 ` [GIT PULL 06/58] lightnvm: include NVM Express driver if OCSSD is selected for build Matias Bjørling
2017-10-13 12:45 ` [GIT PULL 07/58] lightnvm: pblk: protect line bitmap while submitting meta io Matias Bjørling
2017-10-13 12:45 ` [GIT PULL 08/58] lightnvm: pblk: fix message if L2P MAP is in device Matias Bjørling
2017-10-13 12:45 ` [GIT PULL 09/58] lightnvm: pblk: improve error message if down_timeout fails Matias Bjørling
2017-10-13 12:45 ` [GIT PULL 10/58] lightnvm: pblk: print incompatible line version correctly Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 11/58] lightnvm: pblk: reuse pblk_gc_should_kick Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 12/58] lightnvm: pblk: initialize debug stat counter Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 13/58] lightnvm: pblk: use right flag for GC allocation Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 14/58] lightnvm: pblk: free padded entries in write buffer Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 15/58] lightnvm: pblk: fix write I/O sync stat Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 16/58] lightnvm: pblk: avoid deadlock on low LUN config Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 17/58] lightnvm: pblk: fix min size for page mempool Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 18/58] lightnvm: pblk: simplify work_queue mempool Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 19/58] lightnvm: pblk: decouple read/erase mempools Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 20/58] lightnvm: pblk: do not use a mempool for line bitmaps Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 21/58] lightnvm: pblk: remove checks on mempool alloc Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 22/58] lightnvm: pblk: use constant for GC max inflight Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 23/58] lightnvm: pblk: normalize ppa namings Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 24/58] lightnvm: pblk: refactor read lba sanity check Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 25/58] lightnvm: pblk: simplify data validity check on GC Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 26/58] lightnvm: pblk: refactor read path " Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 27/58] lightnvm: pblk: put bio on bio completion Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 28/58] lightnvm: pblk: simplify path on REQ_PREFLUSH Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 29/58] lightnvm: pblk: allocate bio size more accurately Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 30/58] lightnvm: pblk: improve naming for internal req Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 31/58] lightnvm: pblk: refactor rqd alloc/free Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 32/58] lightnvm: pblk: use rqd->end_io for completion Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 33/58] lightnvm: pblk: check lba sanity on read path Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 34/58] lightnvm: pblk: guarantee line integrity on reads Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 35/58] lightnvm: pblk: remove redundant check on read path Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 36/58] lightnvm: pblk: remove I/O dependency on write path Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 37/58] lightnvm: pblk: enable 1 LUN configuration Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 38/58] lightnvm: pblk: ensure right bad block calculation Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 39/58] lightnvm: pblk: fix changing GC group list for a line Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 40/58] lightnvm: pblk: remove useless line Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 41/58] lightnvm: remove unused argument from nvm_set_tgt_bb_tbl Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 42/58] lightnvm: remove stale extern and unused exported symbols Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 43/58] lightnvm: pblk: reduce arguments in __pblk_rb_update_l2p Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 44/58] lightnvm: pblk: fix releases of kmem cache in error path Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 45/58] lightnvm: pblk: prevent gc kicks when gc is not operational Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 46/58] lightnvm: pblk: recover partially written lines correctly Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 47/58] lightnvm: pblk: free full lines during recovery Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 48/58] lightnvm: pblk: start gc if needed during init Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 49/58] lightnvm: pblk: consider bad sectors in emeta during recovery Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 50/58] lightnvm: pblk: shut down gc gracefully during exit Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 51/58] lightnvm: pblk: add l2p crc debug printouts Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 52/58] lightnvm: pblk: gc all lines in the pipeline before exit Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 53/58] lightnvm: pblk: correct valid lba count calculation Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 54/58] lightnvm: pblk: remove spinlock when freeing line metadata Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 55/58] lightnvm: pblk: cleanup unused and static functions Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 56/58] lightnvm: pblk: avoid being reported as hung on rated GC Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 57/58] lightnvm: fail fast on passthrough commands Matias Bjørling
2017-10-13 12:46 ` [GIT PULL 58/58] lightnvm: implement generic path for sync I/O Matias Bjørling
2017-10-13 14:36 ` [GIT PULL 00/58] LightNVM updates for 4.15 Jens Axboe
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