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Date: Sun, 18 Jun 2023 17:04:55 +0200
From: Jochen Friedrich <jochen@...am.de>
To: Jiachen Zhang <zhangjiachen.jaycee@...edance.com>,
Miklos Szeredi <miklos@...redi.hu>,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Andrew Morton <akpm@...l.org>, me@...x.top, jan.peschke@...byte.com
Subject: Re: [PATCH 1/2] fuse: support unlock remote OFD locks on file release
Tested-By: Jochen Friedrich <jochen@...am.de>
On an unpatched Kernel, running Volume migrations in QEMU on a fuse
backed file (linke Quobyte) fails with 'Failed to get "consistent read"
lock' error messages.
With this patch applied, all works well :-)
Best regards, Jochen
Am 08.06.2023 um 10:46 schrieb Jiachen Zhang:
> Like flock(2), the fcntl(2) OFD locks also use struct file addresses as
> the lock owner ID, and also should be unlocked on file release.
>
> The commit 37fb3a30b462 ("fuse: fix flock") fixed the flock unlocking
> issue on file release. This commit aims to fix the OFD lock by reusing
> the release_flag 'FUSE_RELEASE_FLOCK_UNLOCK'. The FUSE daemons should
> unlock both OFD locks and flocks in the FUSE_RELEASE handler.
>
> To make it more clear, rename 'ff->flock' to 'ff->unlock_on_release', as
> it would be used for both flock and OFD lock. It will be set true if the
> value of fl->fl_owner equals to the struct file address.
>
> Fixes: 37fb3a30b462 ("fuse: fix flock")
> Signed-off-by: Jiachen Zhang <zhangjiachen.jaycee@...edance.com>
> ---
> fs/fuse/file.c | 17 ++++++++++++++---
> fs/fuse/fuse_i.h | 2 +-
> 2 files changed, 15 insertions(+), 4 deletions(-)
>
> diff --git a/fs/fuse/file.c b/fs/fuse/file.c
> index de37a3a06a71..7fe9d405969e 100644
> --- a/fs/fuse/file.c
> +++ b/fs/fuse/file.c
> @@ -312,7 +312,7 @@ void fuse_file_release(struct inode *inode, struct fuse_file *ff,
>
> fuse_prepare_release(fi, ff, open_flags, opcode);
>
> - if (ff->flock) {
> + if (ff->unlock_on_release) {
> ra->inarg.release_flags |= FUSE_RELEASE_FLOCK_UNLOCK;
> ra->inarg.lock_owner = fuse_lock_owner_id(ff->fm->fc, id);
> }
> @@ -2650,8 +2650,19 @@ static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl)
> } else {
> if (fc->no_lock)
> err = posix_lock_file(file, fl, NULL);
> - else
> + else {
> + /*
> + * Like flock, the OFD lock also uses the struct
> + * file address as the fl_owner, and should be
> + * unlocked on file release.
> + */
> + if (file == fl->fl_owner) {
> + struct fuse_file *ff = file->private_data;
> +
> + ff->unlock_on_release = true;
> + }
> err = fuse_setlk(file, fl, 0);
> + }
> }
> return err;
> }
> @@ -2668,7 +2679,7 @@ static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl)
> struct fuse_file *ff = file->private_data;
>
> /* emulate flock with POSIX locks */
> - ff->flock = true;
> + ff->unlock_on_release = true;
> err = fuse_setlk(file, fl, 1);
> }
>
> diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
> index 9b7fc7d3c7f1..574f67bd5684 100644
> --- a/fs/fuse/fuse_i.h
> +++ b/fs/fuse/fuse_i.h
> @@ -225,7 +225,7 @@ struct fuse_file {
> wait_queue_head_t poll_wait;
>
> /** Has flock been performed on this file? */
> - bool flock:1;
> + bool unlock_on_release:1;
> };
>
> /** One input argument of a request */
>
> From patchwork Thu Jun 8 08:46:09 2023
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> From: Jiachen Zhang <zhangjiachen.jaycee@...edance.com>
> To: Miklos Szeredi <miklos@...redi.hu>, linux-fsdevel@...r.kernel.org,
> linux-kernel@...r.kernel.org
> Cc: Andrew Morton <akpm@...l.org>, me@...x.top,
> Jiachen Zhang <zhangjiachen.jaycee@...edance.com>
> Subject: [PATCH 2/2] fuse: remove an unnecessary if statement
> Date: Thu, 8 Jun 2023 16:46:09 +0800
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>
> FUSE remote locking code paths never add any locking state to
> inode->i_flctx, so the locks_remove_posix() function called on
> file close will return without calling fuse_setlk().
>
> Therefore, as the if statement to be removed in this commit will
> always be false, remove it for clearness.
>
> Fixes: 7142125937e1 ("[PATCH] fuse: add POSIX file locking support")
> Signed-off-by: Jiachen Zhang <zhangjiachen.jaycee@...edance.com>
> ---
> fs/fuse/file.c | 4 ----
> 1 file changed, 4 deletions(-)
>
> diff --git a/fs/fuse/file.c b/fs/fuse/file.c
> index 7fe9d405969e..57789215c666 100644
> --- a/fs/fuse/file.c
> +++ b/fs/fuse/file.c
> @@ -2619,10 +2619,6 @@ static int fuse_setlk(struct file *file, struct file_lock *fl, int flock)
> return -ENOLCK;
> }
>
> - /* Unlock on close is handled by the flush method */
> - if ((fl->fl_flags & FL_CLOSE_POSIX) == FL_CLOSE_POSIX)
> - return 0;
> -
> fuse_lk_fill(&args, file, fl, opcode, pid_nr, flock, &inarg);
> err = fuse_simple_request(fm, &args);
>
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