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From: David Howells <dhowells@redhat.com>
To: Steve French <smfrench@gmail.com>, Al Viro <viro@zeniv.linux.org.uk>
Cc: Steve French <sfrench@samba.org>,
	Shyam Prasad N <nspmangalore@gmail.com>,
	Rohith Surabattula <rohiths.msft@gmail.com>,
	linux-cifs@vger.kernel.org, dhowells@redhat.com,
	Shyam Prasad N <nspmangalore@gmail.com>,
	Rohith Surabattula <rohiths.msft@gmail.com>,
	Tom Talpey <tom@talpey.com>,
	Christoph Hellwig <hch@infradead.org>,
	Matthew Wilcox <willy@infradead.org>,
	Jeff Layton <jlayton@kernel.org>,
	linux-cifs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [RFC PATCH 6/9] cifs: Add a function to read into an iter from a socket
Date: Fri, 28 Oct 2022 16:56:28 +0100	[thread overview]
Message-ID: <166697258876.61150.3530237818849429372.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <166697254399.61150.1256557652599252121.stgit@warthog.procyon.org.uk>

Add a helper function to read data from a socket into the given iterator.

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: linux-cifs@vger.kernel.org
---

 fs/cifs/cifsproto.h |    3 +++
 fs/cifs/connect.c   |   16 ++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 83e83d8beabb..c5e39cf26e93 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -240,6 +240,9 @@ extern int cifs_read_page_from_socket(struct TCP_Server_Info *server,
 					unsigned int page_offset,
 					unsigned int to_read);
 extern int cifs_setup_cifs_sb(struct cifs_sb_info *cifs_sb);
+extern int cifs_read_iter_from_socket(struct TCP_Server_Info *server,
+				      struct iov_iter *iter,
+				      unsigned int to_read);
 extern int cifs_match_super(struct super_block *, void *);
 extern int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx);
 extern void cifs_umount(struct cifs_sb_info *);
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index ffb291579bb9..bcd34fdd8798 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -790,6 +790,22 @@ cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
 	return cifs_readv_from_socket(server, &smb_msg);
 }
 
+int
+cifs_read_iter_from_socket(struct TCP_Server_Info *server, struct iov_iter *iter,
+			   unsigned int to_read)
+{
+	struct msghdr smb_msg;
+	int ret;
+
+	smb_msg.msg_iter = *iter;
+	if (smb_msg.msg_iter.count > to_read)
+		smb_msg.msg_iter.count = to_read;
+	ret = cifs_readv_from_socket(server, &smb_msg);
+	if (ret > 0)
+		iov_iter_advance(iter, ret);
+	return ret;
+}
+
 static bool
 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
 {



  parent reply	other threads:[~2022-10-28 15:58 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-28 15:55 [RFC PATCH 0/9] smb3: Add iter helpers and use iov_iters down to the network transport David Howells
2022-10-28 15:55 ` [RFC PATCH 1/9] netfs: Add a function to extract a UBUF or IOVEC into a BVEC iterator David Howells
2022-10-28 15:55 ` [RFC PATCH 2/9] netfs: Add a function to extract an iterator into a scatterlist David Howells
2022-10-28 15:56 ` [RFC PATCH 3/9] cifs: Add a function to build an RDMA SGE list from an iterator David Howells
2022-10-28 15:56 ` [RFC PATCH 4/9] cifs: Add a function to Hash the contents of " David Howells
2022-10-28 15:56 ` [RFC PATCH 5/9] cifs: Add some helper functions David Howells
2022-10-28 15:56 ` David Howells [this message]
2022-10-28 15:56 ` [RFC PATCH 7/9] cifs: Change the I/O paths to use an iterator rather than a page list David Howells
2022-10-28 15:56 ` [RFC PATCH 8/9] cifs: Build the RDMA SGE list directly from an iterator David Howells
2022-10-28 15:56 ` [RFC PATCH 9/9] cifs: Remove unused code David Howells

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