Re: [PATCH 1/7] lockd: introduce safe async lock op

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On 23 Aug 2023, at 17:33, Alexander Aring wrote:

> This patch reverts mostly commit 40595cdc93ed ("nfs: block notification
> on fs with its own ->lock") and introduces an EXPORT_OP_SAFE_ASYNC_LOCK
> export flag to signal that the "own ->lock" implementation supports
> async lock requests. The only main user is DLM that is used by GFS2 and
> OCFS2 filesystem. Those implement their own lock() implementation and
> return FILE_LOCK_DEFERRED as return value. Since commit 40595cdc93ed
> ("nfs: block notification on fs with its own ->lock") the DLM
> implementation were never updated. This patch should prepare for DLM
> to set the EXPORT_OP_SAFE_ASYNC_LOCK export flag and update the DLM
> plock implementation regarding to it.
>
> Acked-by: Jeff Layton <jlayton@xxxxxxxxxx>
> Signed-off-by: Alexander Aring <aahringo@xxxxxxxxxx>
> ---
>  fs/lockd/svclock.c       |  5 ++---
>  fs/nfsd/nfs4state.c      | 13 ++++++++++---
>  include/linux/exportfs.h |  8 ++++++++
>  3 files changed, 20 insertions(+), 6 deletions(-)
>
> diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
> index c43ccdf28ed9..6e3b230e8317 100644
> --- a/fs/lockd/svclock.c
> +++ b/fs/lockd/svclock.c
> @@ -470,9 +470,7 @@ nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file,
>  	    struct nlm_host *host, struct nlm_lock *lock, int wait,
>  	    struct nlm_cookie *cookie, int reclaim)
>  {
> -#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
>  	struct inode		*inode = nlmsvc_file_inode(file);
> -#endif
>  	struct nlm_block	*block = NULL;
>  	int			error;
>  	int			mode;
> @@ -486,7 +484,8 @@ nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file,
>  				(long long)lock->fl.fl_end,
>  				wait);
>
> -	if (nlmsvc_file_file(file)->f_op->lock) {
> +	if (!export_op_support_safe_async_lock(inode->i_sb->s_export_op,
> +					       nlmsvc_file_file(file)->f_op)) {

... but don't most filesystem use VFS' posix_lock_file(), which does the
right thing?  I think this patch has broken async lock callbacks for NLM for
all the other filesystems that just use posix_lock_file().

Maybe I'm missing something, but why was that necessary?

Ben





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