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From: Chengguang Xu <cgxu519@mykernel.net>
To: "Al Viro" <viro@zeniv.linux.org.uk>
Cc: "miklos" <miklos@szeredi.hu>, "amir73il" <amir73il@gmail.com>,
	"jack" <jack@suse.cz>,
	"linux-unionfs" <linux-unionfs@vger.kernel.org>,
	"linux-fsdevel" <linux-fsdevel@vger.kernel.org>,
	"cgxu519" <cgxu519@mykernel.net>
Subject: Re: [RFC PATCH 1/5] fs: introduce notifier list for vfs inode
Date: Thu, 15 Oct 2020 11:42:51 +0800	[thread overview]
Message-ID: <1752a5a7164.e9a05b8943438.8099134270028614634@mykernel.net> (raw)
In-Reply-To: <20201015032501.GO3576660@ZenIV.linux.org.uk>

 ---- 在 星期四, 2020-10-15 11:25:01 Al Viro <viro@zeniv.linux.org.uk> 撰写 ----
 > On Sat, Oct 10, 2020 at 10:23:51PM +0800, Chengguang Xu wrote:
 > > Currently there is no notification api for kernel about modification
 > > of vfs inode, in some use cases like overlayfs, this kind of notification
 > > will be very helpful to implement containerized syncfs functionality.
 > > As the first attempt, we introduce marking inode dirty notification so that
 > > overlay's inode could mark itself dirty as well and then only sync dirty
 > > overlay inode while syncfs.
 > 
 > Who's responsible for removing the crap from notifier chain?  And how does
 > that affect the lifetime of inode?
 
In this case, overlayfs unregisters call back from the notifier chain of upper inode
when evicting it's own  inode. It will not affect the lifetime of upper inode because
overlayfs inode holds a reference of upper inode that means upper inode will not be
evicted while overlayfs inode is still alive.


Thanks,
Chengguang

  reply	other threads:[~2020-10-15  3:43 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-10 14:23 [RFC PATCH 0/5] implement containerized syncfs for overlayfs Chengguang Xu
2020-10-10 14:23 ` [RFC PATCH 1/5] fs: introduce notifier list for vfs inode Chengguang Xu
2020-10-14 16:15   ` Jan Kara
2020-10-15  3:03     ` Chengguang Xu
2020-10-15  6:11       ` Amir Goldstein
2020-10-15 11:29         ` Chengguang Xu
2020-10-15 12:32           ` Amir Goldstein
2020-10-15 13:13             ` Chengguang Xu
2020-10-15 16:02               ` Amir Goldstein
2020-10-15 16:06                 ` Amir Goldstein
2020-10-16  1:56                 ` Chengguang Xu
2020-10-16  4:39                   ` Amir Goldstein
2020-10-16  7:43                     ` Chengguang Xu
2020-10-15  3:25   ` Al Viro
2020-10-15  3:42     ` Chengguang Xu [this message]
2020-10-15  4:57       ` Al Viro
2020-10-15 10:56         ` Chengguang Xu
2020-10-16  7:09         ` Chengguang Xu
2020-10-16  9:22           ` Jan Kara
2020-10-10 14:23 ` [RFC PATCH 2/5] fs: export symbol of writeback_single_inode() Chengguang Xu
2020-10-10 14:23 ` [RFC PATCH 3/5] ovl: setup overlayfs' private bdi Chengguang Xu
2020-10-10 14:23 ` [RFC PATCH 4/5] ovl: monitor marking dirty activity of underlying upper inode Chengguang Xu
2020-10-10 14:23 ` [RFC PATCH 5/5] ovl: impement containerized syncfs for overlayfs Chengguang Xu

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