From: David Sterba <dsterba@suse.cz>
To: Josef Bacik <josef@toxicpanda.com>
Cc: linux-btrfs@vger.kernel.org, kernel-team@fb.com
Subject: Re: [PATCH 3/4] btrfs: kill the rcu protection for fs_info->space_info
Date: Wed, 2 Sep 2020 12:32:34 +0200 [thread overview]
Message-ID: <20200902103234.GI28318@twin.jikos.cz> (raw)
In-Reply-To: <a88fca8411a0b1f5bc25926a4489b07af0f65ffa.1598996236.git.josef@toxicpanda.com>
On Tue, Sep 01, 2020 at 05:40:37PM -0400, Josef Bacik wrote:
> We have this thing wrapped in an rcu lock, but it's really not needed.
> We create all the space_info's on mount, and we destroy them on unmount.
> The list never changes and we're protected from messing with it by the
> normal mount/umount path, so kill the RCU stuff around it.
What happens when balance filter converts one profile to a new one?
That's neither mount nor umount and it modifies the space infos, so
the RCU is there to keep the consistent view in case statfs/ioctl
happens, no?
next prev parent reply other threads:[~2020-09-02 10:33 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-01 21:40 [PATCH 0/4][v2] Lockdep fixes Josef Bacik
2020-09-01 21:40 ` [PATCH 1/4] btrfs: fix lockdep splat in add_missing_dev Josef Bacik
2020-09-02 6:23 ` Anand Jain
2020-09-03 11:17 ` David Sterba
2020-09-01 21:40 ` [PATCH 2/4] btrfs: init sysfs for devices outside of the chunk_mutex Josef Bacik
2020-09-02 6:21 ` Anand Jain
2020-09-02 17:45 ` David Sterba
2020-09-03 11:41 ` Anand Jain
2020-09-03 11:42 ` Anand Jain
2020-09-03 11:18 ` David Sterba
2020-09-01 21:40 ` [PATCH 3/4] btrfs: kill the rcu protection for fs_info->space_info Josef Bacik
2020-09-02 8:04 ` Nikolay Borisov
2020-09-02 10:32 ` David Sterba [this message]
2020-09-01 21:40 ` [PATCH 4/4] btrfs: do not create raid sysfs entries under any locks Josef Bacik
2020-09-08 12:40 ` David Sterba
2020-09-08 12:52 ` Josef Bacik
2020-09-04 14:20 ` [PATCH 0/4][v2] Lockdep fixes David Sterba
2020-09-07 13:05 ` David Sterba
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