cifs: Remove cifs_aio_ctx

Remove struct cifs_aio_ctx and its associated alloc/release functions as it
is no longer used, the functions being taken over by netfslib.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Steve French <sfrench@samba.org>
cc: linux-cifs@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/smb/client/cifsglob.h

@@ -1471,29 +1471,6 @@ struct cifs_io_parms {
 	struct TCP_Server_Info *server;
 };
 
-struct cifs_aio_ctx {
-	struct kref		refcount;
-	struct list_head	list;
-	struct mutex		aio_mutex;
-	struct completion	done;
-	struct iov_iter		iter;
-	struct kiocb		*iocb;
-	struct cifsFileInfo	*cfile;
-	struct bio_vec		*bv;
-	loff_t			pos;
-	unsigned int		nr_pinned_pages;
-	ssize_t			rc;
-	unsigned int		len;
-	unsigned int		total_len;
-	unsigned int		bv_need_unpin;	/* If ->bv[] needs unpinning */
-	bool			should_dirty;
-	/*
-	 * Indicates if this aio_ctx is for direct_io,
-	 * If yes, iter is a copy of the user passed iov_iter
-	 */
-	bool			direct_io;
-};
-
 struct cifs_io_request {
 	struct netfs_io_request		rreq;
 	struct cifsFileInfo		*cfile;
@@ -2010,7 +1987,6 @@ require use of the stronger protocol */
  * cifsFileInfo->file_info_lock	cifsFileInfo->count		cifs_new_fileinfo
  *				->invalidHandle			initiate_cifs_search
  *				->oplock_break_cancelled
- * cifs_aio_ctx->aio_mutex		cifs_aio_ctx			cifs_aio_ctx_alloc
  ****************************************************************************/
 
 #ifdef DECLARE_GLOBALS_HERE

fs/smb/client/cifsproto.h

@@ -619,8 +619,6 @@ int __cifs_calc_signature(struct smb_rqst *rqst,
 			struct shash_desc *shash);
 enum securityEnum cifs_select_sectype(struct TCP_Server_Info *,
 					enum securityEnum);
-struct cifs_aio_ctx *cifs_aio_ctx_alloc(void);
-void cifs_aio_ctx_release(struct kref *refcount);
 
 int cifs_alloc_hash(const char *name, struct shash_desc **sdesc);
 void cifs_free_hash(struct shash_desc **sdesc);

fs/smb/client/misc.c

@@ -995,60 +995,6 @@ parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size,
 	return rc;
 }
 
-struct cifs_aio_ctx *
-cifs_aio_ctx_alloc(void)
-{
-	struct cifs_aio_ctx *ctx;
-
-	/*
-	 * Must use kzalloc to initialize ctx->bv to NULL and ctx->direct_io
-	 * to false so that we know when we have to unreference pages within
-	 * cifs_aio_ctx_release()
-	 */
-	ctx = kzalloc(sizeof(struct cifs_aio_ctx), GFP_KERNEL);
-	if (!ctx)
-		return NULL;
-
-	INIT_LIST_HEAD(&ctx->list);
-	mutex_init(&ctx->aio_mutex);
-	init_completion(&ctx->done);
-	kref_init(&ctx->refcount);
-	return ctx;
-}
-
-void
-cifs_aio_ctx_release(struct kref *refcount)
-{
-	struct cifs_aio_ctx *ctx = container_of(refcount,
-					struct cifs_aio_ctx, refcount);
-
-	cifsFileInfo_put(ctx->cfile);
-
-	/*
-	 * ctx->bv is only set if setup_aio_ctx_iter() was call successfuly
-	 * which means that iov_iter_extract_pages() was a success and thus
-	 * that we may have references or pins on pages that we need to
-	 * release.
-	 */
-	if (ctx->bv) {
-		if (ctx->should_dirty || ctx->bv_need_unpin) {
-			unsigned int i;
-
-			for (i = 0; i < ctx->nr_pinned_pages; i++) {
-				struct page *page = ctx->bv[i].bv_page;
-
-				if (ctx->should_dirty)
-					set_page_dirty(page);
-				if (ctx->bv_need_unpin)
-					unpin_user_page(page);
-			}
-		}
-		kvfree(ctx->bv);
-	}
-
-	kfree(ctx);
-}
-
 /**
  * cifs_alloc_hash - allocate hash and hash context together
  * @name: The name of the crypto hash algo