linux-kernel - [PATCH v6 32/34] cifs: DIO to/from KVEC-type iterators should now work

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Message-ID: <167391071464.2311931.14722270915404689054.stgit@warthog.procyon.org.uk>
Date:   Mon, 16 Jan 2023 23:11:54 +0000
From:   David Howells <dhowells@...hat.com>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Steve French <sfrench@...ba.org>,
        Shyam Prasad N <nspmangalore@...il.com>,
        Rohith Surabattula <rohiths.msft@...il.com>,
        Tom Talpey <tom@...pey.com>, Jeff Layton <jlayton@...nel.org>,
        linux-cifs@...r.kernel.org, dhowells@...hat.com,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jens Axboe <axboe@...nel.dk>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        Logan Gunthorpe <logang@...tatee.com>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v6 32/34] cifs: DIO to/from KVEC-type iterators should now
 work

DIO to/from KVEC-type iterators should now work as the iterator is passed
down to the socket in non-RDMA/non-crypto mode and in RDMA or crypto mode
care is taken to handle vmap/vmalloc correctly and not take page refs when
building a scatterlist.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Steve French <sfrench@...ba.org>
cc: Shyam Prasad N <nspmangalore@...il.com>
cc: Rohith Surabattula <rohiths.msft@...il.com>
cc: Tom Talpey <tom@...pey.com>
cc: Jeff Layton <jlayton@...nel.org>
cc: linux-cifs@...r.kernel.org
---

 fs/cifs/file.c |   20 --------------------
 1 file changed, 20 deletions(-)

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 6baf591f63a3..7f1e01cee83d 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -3545,16 +3545,6 @@ static ssize_t __cifs_writev(
 	struct cifs_aio_ctx *ctx;
 	int rc;
 
-	/*
-	 * iov_iter_get_pages_alloc doesn't work with ITER_KVEC.
-	 * In this case, fall back to non-direct write function.
-	 * this could be improved by getting pages directly in ITER_KVEC
-	 */
-	if (direct && iov_iter_is_kvec(from)) {
-		cifs_dbg(FYI, "use non-direct cifs_writev for kvec I/O\n");
-		direct = false;
-	}
-
 	rc = generic_write_checks(iocb, from);
 	if (rc <= 0)
 		return rc;
@@ -4090,16 +4080,6 @@ static ssize_t __cifs_readv(
 	loff_t offset = iocb->ki_pos;
 	struct cifs_aio_ctx *ctx;
 
-	/*
-	 * iov_iter_get_pages_alloc() doesn't work with ITER_KVEC,
-	 * fall back to data copy read path
-	 * this could be improved by getting pages directly in ITER_KVEC
-	 */
-	if (direct && iov_iter_is_kvec(to)) {
-		cifs_dbg(FYI, "use non-direct cifs_user_readv for kvec I/O\n");
-		direct = false;
-	}
-
 	len = iov_iter_count(to);
 	if (!len)
 		return 0;