From: Al Viro <viro@ZenIV.linux.org.uk>
To: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-f2fs-devel@lists.sourceforge.net
Subject: Re: [PATCH] vfs: introduce UMOUNT_WAIT which waits for umount completion
Date: Sat, 16 Sep 2017 00:43:43 +0100 [thread overview]
Message-ID: <20170915234343.GA5426@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20170915232911.GA44998@jaegeuk-macbookpro.roam.corp.google.com>
On Fri, Sep 15, 2017 at 04:29:11PM -0700, Jaegeuk Kim wrote:
> The mntput() in delayed_fput() is the last function call. So before that moment,
> sys_umount() may see mnt_get_count() as 2, so it avoids EBUSY condition. I'm not
> sure why it check over 2 tho.
Because it has just grabbed a reference itself, in addition to the one that keeps
the damn thing alive (due to being mounted). So it bloody well should have
triggered -EBUSY, if they refer to the same vfsmount.
next prev parent reply other threads:[~2017-09-15 23:43 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-13 20:09 [PATCH] vfs: introduce UMOUNT_WAIT which waits for umount completion Jaegeuk Kim
2017-09-13 23:04 ` Al Viro
2017-09-13 23:31 ` Jaegeuk Kim
2017-09-13 23:44 ` Al Viro
2017-09-14 1:10 ` Jaegeuk Kim
2017-09-14 1:10 ` Jaegeuk Kim
2017-09-14 1:30 ` Al Viro
2017-09-14 18:37 ` Al Viro
2017-09-14 19:14 ` Jaegeuk Kim
2017-09-15 0:19 ` Jaegeuk Kim
2017-09-15 2:06 ` Al Viro
2017-09-15 2:06 ` Al Viro
2017-09-15 3:45 ` Jaegeuk Kim
2017-09-15 4:21 ` Al Viro
2017-09-15 18:44 ` Jaegeuk Kim
2017-09-15 22:12 ` Theodore Ts'o
2017-09-15 22:12 ` Theodore Ts'o
2017-09-15 23:29 ` Jaegeuk Kim
2017-09-15 23:43 ` Al Viro [this message]
2017-09-19 15:55 ` Jaegeuk Kim
2017-09-16 7:11 ` Amir Goldstein
2017-09-16 7:11 ` Amir Goldstein
2017-09-20 17:38 ` [PATCH v2] " Jaegeuk Kim
2017-09-20 18:38 ` Al Viro
2017-09-21 0:34 ` Jaegeuk Kim
2017-09-21 2:42 ` Al Viro
2017-09-21 5:02 ` Jaegeuk Kim
2017-09-21 14:48 ` Theodore Ts'o
2017-09-21 17:16 ` Jaegeuk Kim
2017-09-21 18:20 ` [PATCH v3] vfs: introduce UMOUNT_WAIT to wait for delayed_fput/mntput completion Jaegeuk Kim
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