linux-ext4 - [PATCH RFC 0/32] block: Make blkdev_get_by

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Date:   Tue,  4 Jul 2023 14:21:27 +0200
From:   Jan Kara <jack@...e.cz>
To:     <linux-block@...r.kernel.org>
Cc:     <linux-fsdevel@...r.kernel.org>, Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@...radead.org>, Jan Kara <jack@...e.cz>,
        Alasdair Kergon <agk@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anna Schumaker <anna@...nel.org>, Chao Yu <chao@...nel.org>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Dave Kleikamp <shaggy@...nel.org>,
        David Sterba <dsterba@...e.com>, dm-devel@...hat.com,
        drbd-dev@...ts.linbit.com, Gao Xiang <xiang@...nel.org>,
        Jack Wang <jinpu.wang@...os.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        jfs-discussion@...ts.sourceforge.net,
        Joern Engel <joern@...ybastard.org>,
        Joseph Qi <joseph.qi@...ux.alibaba.com>,
        Kent Overstreet <kent.overstreet@...il.com>,
        linux-bcache@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, linux-mm@...ck.org,
        linux-mtd@...ts.infradead.org, linux-nfs@...r.kernel.org,
        linux-nilfs@...r.kernel.org, linux-nvme@...ts.infradead.org,
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        linux-s390@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-xfs@...r.kernel.org,
        "Md. Haris Iqbal" <haris.iqbal@...os.com>,
        Mike Snitzer <snitzer@...nel.org>,
        Minchan Kim <minchan@...nel.org>, ocfs2-devel@....oracle.com,
        reiserfs-devel@...r.kernel.org,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Song Liu <song@...nel.org>,
        Sven Schnelle <svens@...ux.ibm.com>,
        target-devel@...r.kernel.org, Ted Tso <tytso@....edu>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        xen-devel@...ts.xenproject.org
Subject: [PATCH RFC 0/32] block: Make blkdev_get_by_*() return handle

Hello,

this patch series implements the idea of blkdev_get_by_*() calls returning
bdev_handle which is then passed to blkdev_put() [1]. This makes the get
and put calls for bdevs more obviously matching and allows us to propagate
context from get to put without having to modify all the users (again!).
In particular I need to propagate used open flags to blkdev_put() to be able
count writeable opens and add support for blocking writes to mounted block
devices. I'll send that series separately.

The series is based on Linus' tree as of yesterday + two bcache fixes which are
in the block tree. Patches have passed some basic testing, I plan to test more
users once we agree this is the right way to go.

								Honza

[1] https://lore.kernel.org/all/ZJGNsVDhZx0Xgs2H@infradead.org

CC: Alasdair Kergon <agk@...hat.com>
CC: Andrew Morton <akpm@...ux-foundation.org>
CC: Anna Schumaker <anna@...nel.org>
CC: Chao Yu <chao@...nel.org>
CC: Christian Borntraeger <borntraeger@...ux.ibm.com>
CC: Coly Li <colyli@...e.de
CC: "Darrick J. Wong" <djwong@...nel.org>
CC: Dave Kleikamp <shaggy@...nel.org>
CC: David Sterba <dsterba@...e.com>
CC: dm-devel@...hat.com
CC: drbd-dev@...ts.linbit.com
CC: Gao Xiang <xiang@...nel.org>
CC: Jack Wang <jinpu.wang@...os.com>
CC: Jaegeuk Kim <jaegeuk@...nel.org>
CC: jfs-discussion@...ts.sourceforge.net
CC: Joern Engel <joern@...ybastard.org>
CC: Joseph Qi <joseph.qi@...ux.alibaba.com>
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CC: linux-bcache@...r.kernel.org
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CC: linux-erofs@...ts.ozlabs.org
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CC: "Md. Haris Iqbal" <haris.iqbal@...os.com>
CC: Mike Snitzer <snitzer@...nel.org>
CC: Minchan Kim <minchan@...nel.org>
CC: ocfs2-devel@....oracle.com
CC: reiserfs-devel@...r.kernel.org
CC: Sergey Senozhatsky <senozhatsky@...omium.org>
CC: Song Liu <song@...nel.org>
CC: Sven Schnelle <svens@...ux.ibm.com>
CC: target-devel@...r.kernel.org
CC: Ted Tso <tytso@....edu>
CC: Trond Myklebust <trond.myklebust@...merspace.com>
CC: xen-devel@...ts.xenproject.org