cifs: Make wait_mtu_credits take size_t args

Make the wait_mtu_credits functions use size_t for the size and num
arguments rather than unsigned int as netfslib uses size_t/ssize_t for
arguments and return values to allow for extra capacity.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Steve French <sfrench@samba.org>
cc: Shyam Prasad N <nspmangalore@gmail.com>
cc: Rohith Surabattula <rohiths.msft@gmail.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cifs@vger.kernel.org
cc: linux-cachefs@redhat.com
cc: netfs@lists.linux.dev
cc: linux-mm@kvack.org

fs/smb/client/cifsglob.h

@@ -546,8 +546,8 @@ struct smb_version_operations {
 	/* writepages retry size */
 	unsigned int (*wp_retry_size)(struct inode *);
 	/* get mtu credits */
-	int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,
-				unsigned int *, struct cifs_credits *);
+	int (*wait_mtu_credits)(struct TCP_Server_Info *, size_t,
+				size_t *, struct cifs_credits *);
 	/* adjust previously taken mtu credits to request size */
 	int (*adjust_credits)(struct TCP_Server_Info *server,
 			      struct cifs_credits *credits,

fs/smb/client/cifsproto.h

@@ -121,7 +121,7 @@ extern struct mid_q_entry *cifs_setup_async_request(struct TCP_Server_Info *,
 extern int cifs_check_receive(struct mid_q_entry *mid,
 			struct TCP_Server_Info *server, bool log_error);
 extern int cifs_wait_mtu_credits(struct TCP_Server_Info *server,
-				 unsigned int size, unsigned int *num,
+				 size_t size, size_t *num,
 				 struct cifs_credits *credits);
 extern int SendReceive2(const unsigned int /* xid */ , struct cifs_ses *,
 			struct kvec *, int /* nvec to send */,

fs/smb/client/file.c

@@ -2783,7 +2783,8 @@ static ssize_t cifs_write_back_from_locked_folio(struct address_space *mapping,
 	struct cifs_credits *credits = &credits_on_stack;
 	struct cifsFileInfo *cfile = NULL;
 	unsigned long long i_size = i_size_read(inode), max_len;
-	unsigned int xid, wsize;
+	unsigned int xid;
+	size_t wsize;
 	size_t len = folio_size(folio);
 	long count = wbc->nr_to_write;
 	int rc;
@@ -3285,7 +3286,7 @@ static int
 cifs_resend_wdata(struct cifs_io_subrequest *wdata, struct list_head *wdata_list,
 	struct cifs_aio_ctx *ctx)
 {
-	unsigned int wsize;
+	size_t wsize;
 	struct cifs_credits credits;
 	int rc;
 	struct TCP_Server_Info *server = wdata->server;
@@ -3420,7 +3421,8 @@ cifs_write_from_iter(loff_t fpos, size_t len, struct iov_iter *from,
 	do {
 		struct cifs_credits credits_on_stack;
 		struct cifs_credits *credits = &credits_on_stack;
-		unsigned int wsize, nsegs = 0;
+		unsigned int nsegs = 0;
+		size_t wsize;
 
 		if (signal_pending(current)) {
 			rc = -EINTR;
@@ -3857,7 +3859,7 @@ static int cifs_resend_rdata(struct cifs_io_subrequest *rdata,
 			struct list_head *rdata_list,
 			struct cifs_aio_ctx *ctx)
 {
-	unsigned int rsize;
+	size_t rsize;
 	struct cifs_credits credits;
 	int rc;
 	struct TCP_Server_Info *server;
@@ -3931,10 +3933,10 @@ cifs_send_async_read(loff_t fpos, size_t len, struct cifsFileInfo *open_file,
 		     struct cifs_aio_ctx *ctx)
 {
 	struct cifs_io_subrequest *rdata;
-	unsigned int rsize, nsegs, max_segs = INT_MAX;
+	unsigned int nsegs, max_segs = INT_MAX;
 	struct cifs_credits credits_on_stack;
 	struct cifs_credits *credits = &credits_on_stack;
-	size_t cur_len, max_len;
+	size_t cur_len, max_len, rsize;
 	int rc;
 	pid_t pid;
 	struct TCP_Server_Info *server;
@@ -4530,12 +4532,13 @@ static void cifs_readahead(struct readahead_control *ractl)
 	 * Chop the readahead request up into rsize-sized read requests.
 	 */
 	while ((nr_pages = ra_pages)) {
-		unsigned int i, rsize;
+		unsigned int i;
 		struct cifs_io_subrequest *rdata;
 		struct cifs_credits credits_on_stack;
 		struct cifs_credits *credits = &credits_on_stack;
 		struct folio *folio;
 		pgoff_t fsize;
+		size_t rsize;
 
 		/*
 		 * Find out if we have anything cached in the range of

fs/smb/client/smb2ops.c

@@ -217,8 +217,8 @@ smb2_get_credits(struct mid_q_entry *mid)
 }
 
 static int
-smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
-		      unsigned int *num, struct cifs_credits *credits)
+smb2_wait_mtu_credits(struct TCP_Server_Info *server, size_t size,
+		      size_t *num, struct cifs_credits *credits)
 {
 	int rc = 0;
 	unsigned int scredits, in_flight;

fs/smb/client/transport.c

@@ -691,8 +691,8 @@ wait_for_compound_request(struct TCP_Server_Info *server, int num,
 }
 
 int
-cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
-		      unsigned int *num, struct cifs_credits *credits)
+cifs_wait_mtu_credits(struct TCP_Server_Info *server, size_t size,
+		      size_t *num, struct cifs_credits *credits)
 {
 	*num = size;
 	credits->value = 0;