linux-kernel - [RFC PATCH 01/09] Introduce offset for the 1st page in data transfer structures

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Date:   Thu, 17 May 2018 17:22:06 -0700
From:   Long Li <longli@...uxonhyperv.com>
To:     Steve French <sfrench@...ba.org>, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org
Cc:     Long Li <longli@...rosoft.com>
Subject: [RFC PATCH 01/09] Introduce offset for the 1st page in data transfer structures

From: Long Li <longli@...rosoft.com>

Currently CIFS allocates its own pages for data transfer, they don't need offset
since it's always 0 in the 1st page.

Direct data transfer needs to define an offset because user-data may not start
on the page boundary

Signed-off-by: Long Li <longli@...rosoft.com>
---
 fs/cifs/cifsglob.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index cb950a5..a51855c 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -176,6 +176,7 @@ struct smb_rqst {
 	struct kvec	*rq_iov;	/* array of kvecs */
 	unsigned int	rq_nvec;	/* number of kvecs in array */
 	struct page	**rq_pages;	/* pointer to array of page ptrs */
+	unsigned int	rq_offset;	/* the offset to the 1st page */
 	unsigned int	rq_npages;	/* number pages in array */
 	unsigned int	rq_pagesz;	/* page size to use */
 	unsigned int	rq_tailsz;	/* length of last page */
@@ -1167,8 +1168,10 @@ struct cifs_readdata {
 	struct kvec			iov[2];
 #ifdef CONFIG_CIFS_SMB_DIRECT
 	struct smbd_mr			*mr;
+	struct page			**direct_pages;
 #endif
 	unsigned int			pagesz;
+	unsigned int			page_offset;
 	unsigned int			tailsz;
 	unsigned int			credits;
 	unsigned int			nr_pages;
@@ -1192,8 +1195,10 @@ struct cifs_writedata {
 	int				result;
 #ifdef CONFIG_CIFS_SMB_DIRECT
 	struct smbd_mr			*mr;
+	struct page			**direct_pages;
 #endif
 	unsigned int			pagesz;
+	unsigned int			page_offset;
 	unsigned int			tailsz;
 	unsigned int			credits;
 	unsigned int			nr_pages;
-- 
2.7.4