linux-kernel - [RFC PATCH 07/11] cifs: Drop the check using iov_iter

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Message-ID: <20230630152524.661208-8-dhowells@redhat.com>
Date:   Fri, 30 Jun 2023 16:25:20 +0100
From:   David Howells <dhowells@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>, Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>
Cc:     David Howells <dhowells@...hat.com>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Hillf Danton <hdanton@...a.com>,
        Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Steve French <sfrench@...ba.org>, Paulo Alcantara <pc@....nz>,
        Ronnie Sahlberg <lsahlber@...hat.com>,
        Shyam Prasad N <sprasad@...rosoft.com>,
        Tom Talpey <tom@...pey.com>, Christoph Hellwig <hch@....de>,
        Christian Brauner <christian@...uner.io>,
        linux-cifs@...r.kernel.org
Subject: [RFC PATCH 07/11] cifs: Drop the check using iov_iter_rw()

smbd_recv() has a check that the iterator is the correct direction.  Drop
this check as we're getting rid of iov_iter_rw().

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Steve French <sfrench@...ba.org>
cc: Paulo Alcantara <pc@....nz>
cc: Ronnie Sahlberg <lsahlber@...hat.com>
cc: Shyam Prasad N <sprasad@...rosoft.com>
cc: Tom Talpey <tom@...pey.com>
cc: Christoph Hellwig <hch@....de>
cc: Jens Axboe <axboe@...nel.dk>
cc: Christian Brauner <christian@...uner.io>
cc: Alexander Viro <viro@...iv.linux.org.uk>
cc: linux-cifs@...r.kernel.org
cc: linux-block@...r.kernel.org
cc: linux-fsdevel@...r.kernel.org
---
 fs/smb/client/smbdirect.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/fs/smb/client/smbdirect.c b/fs/smb/client/smbdirect.c
index 223e17c16b60..672078d00207 100644
--- a/fs/smb/client/smbdirect.c
+++ b/fs/smb/client/smbdirect.c
@@ -1906,14 +1906,6 @@ int smbd_recv(struct smbd_connection *info, struct msghdr *msg)
 	unsigned int to_read, page_offset;
 	int rc;
 
-	if (iov_iter_rw(&msg->msg_iter) == WRITE) {
-		/* It's a bug in upper layer to get there */
-		cifs_dbg(VFS, "Invalid msg iter dir %u\n",
-			 iov_iter_rw(&msg->msg_iter));
-		rc = -EINVAL;
-		goto out;
-	}
-
 	switch (iov_iter_type(&msg->msg_iter)) {
 	case ITER_KVEC:
 		buf = msg->msg_iter.kvec->iov_base;
@@ -1935,7 +1927,6 @@ int smbd_recv(struct smbd_connection *info, struct msghdr *msg)
 		rc = -EINVAL;
 	}
 
-out:
 	/* SMBDirect will read it all or nothing */
 	if (rc > 0)
 		msg->msg_iter.count = 0;