Re: [PATCH 1/2] netfs: ->cleanup() op is always given a rreq pointer now

[Jeff Layton]

On Thu, 2022-05-19 at 15:16 +0100, David Howells wrote:
> As the ->init() netfs op is now used to set up the netfslib I/O request
> rather than passing stuff in, thereby allowing the netfslib functions to be
> pointed at directly by the address_space_operations struct, we're always
> going to be able to pass an I/O request pointer to the cleanup function.
> 
> Therefore, change the ->cleanup() function to take a pointer to the I/O
> request rather than taking a pointer to the network filesystem's
> address_space and a piece of private data.
> 
> Also, rename ->cleanup() to ->free_request() to match the ->init_request()
> function.
> 
> Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
> cc: Jeff Layton <jlayton@xxxxxxxxxx>
> cc: Steve French <sfrench@xxxxxxxxx>
> cc: Dominique Martinet <asmadeus@xxxxxxxxxxxxx>
> cc: Jeff Layton <jlayton@xxxxxxxxxx>
> cc: David Wysochanski <dwysocha@xxxxxxxxxx>
> cc: Ilya Dryomov <idryomov@xxxxxxxxx>
> cc: v9fs-developer@xxxxxxxxxxxxxxxxxxxxx
> cc: ceph-devel@xxxxxxxxxxxxxxx
> cc: linux-afs@xxxxxxxxxxxxxxxxxxx
> cc: linux-cifs@xxxxxxxxxxxxxxx
> cc: linux-cachefs@xxxxxxxxxx
> cc: linux-fsdevel@xxxxxxxxxxxxxxx
> ---
> 
>  fs/9p/vfs_addr.c      |   11 +++++------
>  fs/afs/file.c         |    6 +++---
>  fs/ceph/addr.c        |    9 ++++-----
>  fs/netfs/objects.c    |    8 +++++---
>  include/linux/netfs.h |    4 +++-
>  5 files changed, 20 insertions(+), 18 deletions(-)
> 
> diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
> index 501128188343..002c482794dc 100644
> --- a/fs/9p/vfs_addr.c
> +++ b/fs/9p/vfs_addr.c
> @@ -66,13 +66,12 @@ static int v9fs_init_request(struct netfs_io_request *rreq, struct file *file)
>  }
>  
>  /**
> - * v9fs_req_cleanup - Cleanup request initialized by v9fs_init_request
> - * @mapping: unused mapping of request to cleanup
> - * @priv: private data to cleanup, a fid, guaranted non-null.
> + * v9fs_free_request - Cleanup request initialized by v9fs_init_rreq
> + * @rreq: The I/O request to clean up
>   */
> -static void v9fs_req_cleanup(struct address_space *mapping, void *priv)
> +static void v9fs_free_request(struct netfs_io_request *rreq)
>  {
> -	struct p9_fid *fid = priv;
> +	struct p9_fid *fid = rreq->netfs_priv;
>  
>  	p9_client_clunk(fid);
>  }
> @@ -94,9 +93,9 @@ static int v9fs_begin_cache_operation(struct netfs_io_request *rreq)
>  
>  const struct netfs_request_ops v9fs_req_ops = {
>  	.init_request		= v9fs_init_request,
> +	.free_request		= v9fs_free_request,
>  	.begin_cache_operation	= v9fs_begin_cache_operation,
>  	.issue_read		= v9fs_issue_read,
> -	.cleanup		= v9fs_req_cleanup,
>  };
>  
>  /**
> diff --git a/fs/afs/file.c b/fs/afs/file.c
> index 26292a110a8f..b9ca72fbbcf9 100644
> --- a/fs/afs/file.c
> +++ b/fs/afs/file.c
> @@ -383,17 +383,17 @@ static int afs_check_write_begin(struct file *file, loff_t pos, unsigned len,
>  	return test_bit(AFS_VNODE_DELETED, &vnode->flags) ? -ESTALE : 0;
>  }
>  
> -static void afs_priv_cleanup(struct address_space *mapping, void *netfs_priv)
> +static void afs_free_request(struct netfs_io_request *rreq)
>  {
> -	key_put(netfs_priv);
> +	key_put(rreq->netfs_priv);
>  }
>  
>  const struct netfs_request_ops afs_req_ops = {
>  	.init_request		= afs_init_request,
> +	.free_request		= afs_free_request,
>  	.begin_cache_operation	= afs_begin_cache_operation,
>  	.check_write_begin	= afs_check_write_begin,
>  	.issue_read		= afs_issue_read,
> -	.cleanup		= afs_priv_cleanup,
>  };
>  
>  int afs_write_inode(struct inode *inode, struct writeback_control *wbc)
> diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
> index b6edcf89a429..ee8c1b099c4f 100644
> --- a/fs/ceph/addr.c
> +++ b/fs/ceph/addr.c
> @@ -392,11 +392,10 @@ static int ceph_init_request(struct netfs_io_request *rreq, struct file *file)
>  	return 0;
>  }
>  
> -static void ceph_readahead_cleanup(struct address_space *mapping, void *priv)
> +static void ceph_netfs_free_request(struct netfs_io_request *rreq)
>  {
> -	struct inode *inode = mapping->host;
> -	struct ceph_inode_info *ci = ceph_inode(inode);
> -	int got = (uintptr_t)priv;
> +	struct ceph_inode_info *ci = ceph_inode(rreq->inode);
> +	int got = (uintptr_t)rreq->netfs_priv;
>  
>  	if (got)
>  		ceph_put_cap_refs(ci, got);
> @@ -404,12 +403,12 @@ static void ceph_readahead_cleanup(struct address_space *mapping, void *priv)
>  
>  const struct netfs_request_ops ceph_netfs_ops = {
>  	.init_request		= ceph_init_request,
> +	.free_request		= ceph_netfs_free_request,
>  	.begin_cache_operation	= ceph_begin_cache_operation,
>  	.issue_read		= ceph_netfs_issue_read,
>  	.expand_readahead	= ceph_netfs_expand_readahead,
>  	.clamp_length		= ceph_netfs_clamp_length,
>  	.check_write_begin	= ceph_netfs_check_write_begin,
> -	.cleanup		= ceph_readahead_cleanup,
>  };
>  
>  #ifdef CONFIG_CEPH_FSCACHE
> diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c
> index e86107b30ba4..d6b8c0cbeb7c 100644
> --- a/fs/netfs/objects.c
> +++ b/fs/netfs/objects.c
> @@ -75,10 +75,10 @@ static void netfs_free_request(struct work_struct *work)
>  	struct netfs_io_request *rreq =
>  		container_of(work, struct netfs_io_request, work);
>  
> -	netfs_clear_subrequests(rreq, false);
> -	if (rreq->netfs_priv)
> -		rreq->netfs_ops->cleanup(rreq->mapping, rreq->netfs_priv);
>  	trace_netfs_rreq(rreq, netfs_rreq_trace_free);
> +	netfs_clear_subrequests(rreq, false);
> +	if (rreq->netfs_ops->free_request)
> +		rreq->netfs_ops->free_request(rreq);
>  	if (rreq->cache_resources.ops)
>  		rreq->cache_resources.ops->end_operation(&rreq->cache_resources);
>  	kfree(rreq);
> @@ -140,6 +140,8 @@ static void netfs_free_subrequest(struct netfs_io_subrequest *subreq,
>  	struct netfs_io_request *rreq = subreq->rreq;
>  
>  	trace_netfs_sreq(subreq, netfs_sreq_trace_free);
> +	if (rreq->netfs_ops->free_subrequest)
> +		rreq->netfs_ops->free_subrequest(subreq);
>  	kfree(subreq);
>  	netfs_stat_d(&netfs_n_rh_sreq);
>  	netfs_put_request(rreq, was_async, netfs_rreq_trace_put_subreq);
> diff --git a/include/linux/netfs.h b/include/linux/netfs.h
> index c7bf1eaf51d5..1970c21b4f80 100644
> --- a/include/linux/netfs.h
> +++ b/include/linux/netfs.h
> @@ -204,7 +204,10 @@ struct netfs_io_request {
>   */
>  struct netfs_request_ops {
>  	int (*init_request)(struct netfs_io_request *rreq, struct file *file);
> +	void (*free_request)(struct netfs_io_request *rreq);
> +	void (*free_subrequest)(struct netfs_io_subrequest *rreq);

Do we need free_subrequest? It looks like nothing defines it in this
series.

>  	int (*begin_cache_operation)(struct netfs_io_request *rreq);
> +
>  	void (*expand_readahead)(struct netfs_io_request *rreq);
>  	bool (*clamp_length)(struct netfs_io_subrequest *subreq);
>  	void (*issue_read)(struct netfs_io_subrequest *subreq);
> @@ -212,7 +215,6 @@ struct netfs_request_ops {
>  	int (*check_write_begin)(struct file *file, loff_t pos, unsigned len,
>  				 struct folio *folio, void **_fsdata);
>  	void (*done)(struct netfs_io_request *rreq);
> -	void (*cleanup)(struct address_space *mapping, void *netfs_priv);
>  };
>  
>  /*
> 
> 

-- 
Jeff Layton <jlayton@xxxxxxxxxx>