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Subject[RFC PATCH 01/09] Introduce offset for the 1st page in data transfer structures
Date
From: Long Li <longli@microsoft.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@microsoft.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
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