From: Al Viro <viro@zeniv.linux.org.uk>
To: Denis Kirjanov <kda@linux-powerpc.org>
Cc: Christoph Hellwig <hch@infradead.org>,
linux-kernel@vger.kernel.org, Jakub Kicinski <kuba@kernel.org>,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH] fs: export kern_path_locked
Date: Fri, 19 Feb 2021 04:11:05 +0000 [thread overview]
Message-ID: <YC86WeSTkYZqRlJY@zeniv-ca.linux.org.uk> (raw)
In-Reply-To: <YCwIQmsxWxuw+dnt@zeniv-ca.linux.org.uk>
On Tue, Feb 16, 2021 at 06:00:34PM +0000, Al Viro wrote:
> Sigh... OK, so we want something like
> user_path_create()
> vfs_mknod()
> created = true
> grab bindlock
> ....
> drop bindlock
> if failed && created
> vfs_unlink()
> done_path_create()
> in unix_bind()... That would push ->bindlock all way down in the hierarchy,
> so that should be deadlock-free, but it looks like that'll be fucking ugly ;-/
>
> Let me try and play with that a bit, maybe it can be massaged to something
> relatively sane...
OK... Completely untested series follows. Preliminary massage in first
6 patches, then actual "add cleanup on failure", then minor followup
cleanup.
af_unix: take address assignment/hash insertion into a new helper
unix_bind(): allocate addr earlier
unix_bind(): separate BSD and abstract cases
unix_bind(): take BSD and abstract address cases into new helpers
fold unix_mknod() into unix_bind_bsd()
unix_bind_bsd(): move done_path_create() call after dealing with ->bindlock
unix_bind_bsd(): unlink if we fail after successful mknod
__unix_find_socket_byname(): don't pass hash and type separately
Branch is in git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git #misc.af_unix,
individual patches in followups
next prev parent reply other threads:[~2021-02-19 4:12 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-25 15:49 [PATCH] fs: export kern_path_locked Denis Kirjanov
2021-01-27 17:57 ` Christoph Hellwig
[not found] ` <CAOJe8K0MC-TCURE2Gpci1SLnLXCbUkE7q6SS0fznzBA+Pf-B8Q@mail.gmail.com>
[not found] ` <20210129082524.GA2282796@infradead.org>
[not found] ` <CAOJe8K0iG91tm8YBRmE_rdMMMbc4iRsMGYNxJk0p9vEedNHEkg@mail.gmail.com>
[not found] ` <20210129131855.GA2346744@infradead.org>
2021-02-14 18:17 ` Al Viro
2021-02-16 14:31 ` Denis Kirjanov
2021-02-16 18:00 ` Al Viro
2021-02-19 4:11 ` Al Viro [this message]
2021-02-19 4:19 ` [PATCH 1/8] af_unix: take address assignment/hash insertion into a new helper Al Viro
2021-02-20 19:12 ` Cong Wang
2021-02-20 19:32 ` Al Viro
2021-02-20 20:31 ` Cong Wang
2021-02-20 21:08 ` Al Viro
2021-02-22 19:06 ` [PATCHSET] making unix_bind() undo mknod on failure Al Viro
2021-02-22 19:12 ` [PATCH 1/8] af_unix: take address assignment/hash insertion into a new helper Al Viro
2021-02-22 19:12 ` [PATCH 2/8] unix_bind(): allocate addr earlier Al Viro
2021-02-22 19:12 ` [PATCH 3/8] unix_bind(): separate BSD and abstract cases Al Viro
2021-02-22 19:12 ` [PATCH 4/8] unix_bind(): take BSD and abstract address cases into new helpers Al Viro
2021-02-22 19:12 ` [PATCH 5/8] fold unix_mknod() into unix_bind_bsd() Al Viro
2021-02-22 19:12 ` [PATCH 6/8] unix_bind_bsd(): move done_path_create() call after dealing with ->bindlock Al Viro
2021-02-22 19:12 ` [PATCH 7/8] unix_bind_bsd(): unlink if we fail after successful mknod Al Viro
2021-02-22 19:12 ` [PATCH 8/8] __unix_find_socket_byname(): don't pass hash and type separately Al Viro
2021-02-22 19:12 ` [PATCHSET] making unix_bind() undo mknod on failure Al Viro
2021-02-22 19:24 ` Al Viro
2021-02-24 0:40 ` Jakub Kicinski
2021-02-19 4:20 ` [PATCH 2/8] unix_bind(): allocate addr earlier Al Viro
2021-02-19 4:21 ` [PATCH 3/8] unix_bind(): separate BSD and abstract cases Al Viro
2021-02-19 4:21 ` [PATCH 4/8] unix_bind(): take BSD and abstract address cases into new helpers Al Viro
2021-02-19 4:22 ` [PATCH 5/8] fold unix_mknod() into unix_bind_bsd() Al Viro
2021-02-19 4:22 ` [PATCH 6/8] unix_bind_bsd(): move done_path_create() call after dealing with ->bindlock Al Viro
2021-02-19 4:23 ` [PATCH 7/8] unix_bind_bsd(): unlink if we fail after successful mknod Al Viro
2021-02-19 4:23 ` [PATCH 8/8] __unix_find_socket_byname(): don't pass hash and type separately Al Viro
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