[PATCH 10/17] cifs: Only pick a channel once per read request

David Howells
2024-06-20T17:33:19Z

In cifs, only pick a channel when setting up a read request rather than
doing so individually for every subrequest and instead use that channel for
all. This mirrors what the code in v6.9 does.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Steve French <sfrench@samba.org>
cc: Paulo Alcantara <pc@manguebit.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cifs@vger.kernel.org
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
---
fs/smb/client/cifsglob.h | 1 +
fs/smb/client/file.c | 14 +++-----------
2 files changed, 4 insertions(+), 11 deletions(-)

diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h
index 4b00512fb9f9..b48d3f5e8889 100644
--- a/fs/smb/client/cifsglob.h
+++ b/fs/smb/client/cifsglob.h
@@ -1494,6 +1494,7 @@ struct cifs_aio_ctx {
struct cifs_io_request {
struct netfs_io_request rreq;
struct cifsFileInfo *cfile;
+ struct TCP_Server_Info *server;
};

/* asynchronous read support */
diff --git a/fs/smb/client/file.c b/fs/smb/client/file.c
index 67dd8fcd0e6d..16fa1ac1ed2d 100644
--- a/fs/smb/client/file.c
+++ b/fs/smb/client/file.c
@@ -134,17 +134,15 @@ static void cifs_issue_write(struct netfs_io_subrequest *subreq)
static bool cifs_clamp_length(struct netfs_io_subrequest *subreq)
{
struct netfs_io_request *rreq = subreq->rreq;
- struct TCP_Server_Info *server;
struct cifs_io_subrequest *rdata = container_of(subreq, struct cifs_io_subrequest, subreq);
struct cifs_io_request *req = container_of(subreq->rreq, struct cifs_io_request, rreq);
+ struct TCP_Server_Info *server = req->server;
struct cifs_sb_info *cifs_sb = CIFS_SB(rreq->inode->i_sb);
size_t rsize = 0;
int rc;

rdata->xid = get_xid();
rdata->have_xid = true;
-
- server = cifs_pick_channel(tlink_tcon(req->cfile->tlink)->ses);
rdata->server = server;

if (cifs_sb->ctx->rsize == 0)
@@ -203,14 +201,7 @@ static void cifs_req_issue_read(struct netfs_io_subrequest *subreq)
__set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
rdata->pid = pid;

- rc = adjust_credits(rdata->server, &rdata->credits, rdata->subreq.len);
- if (!rc) {
- if (rdata->req->cfile->invalidHandle)
- rc = -EAGAIN;
- else
- rc = rdata->server->ops->async_readv(rdata);
- }
-
+ rc = rdata->server->ops->async_readv(rdata);
out:
if (rc)
netfs_subreq_terminated(subreq, rc, false);
@@ -250,6 +241,7 @@ static int cifs_init_request(struct netfs_io_request *rreq, struct file *file)
open_file = file->private_data;
rreq->netfs_priv = file->private_data;
req->cfile = cifsFileInfo_get(open_file);
+ req->server = cifs_pick_channel(tlink_tcon(req->cfile->tlink)->ses);
} else if (rreq->origin != NETFS_WRITEBACK) {
WARN_ON_ONCE(1);
return -EIO;