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CIFS: Introduce offset for the 1st page in data transfer structures 

When direct I/O is used, the data buffer may not always align to page
boundaries. Introduce a page offset in transport data structures to
describe the location of the buffer within the page.

Also change the function to pass the page offset when sending data to
transport.

Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Long Li 2018-05-30 12:47:53 -07:00 committed by Steve French
parent eccb4422cf
commit 57a929a66f
2 changed files with 4 additions and 0 deletions
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3
fs/cifs/cifsglob.h
View File

@ -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 */
@ -1174,6 +1175,7 @@ struct cifs_readdata {
struct smbd_mr *mr;
#endif
unsigned int pagesz;
unsigned int page_offset;
unsigned int tailsz;
unsigned int credits;
unsigned int nr_pages;
@ -1199,6 +1201,7 @@ struct cifs_writedata {
struct smbd_mr *mr;
#endif
unsigned int pagesz;
unsigned int page_offset;
unsigned int tailsz;
unsigned int credits;
unsigned int nr_pages;

1
fs/cifs/smb2pdu.c
View File

@ -3045,6 +3045,7 @@ smb2_async_writev(struct cifs_writedata *wdata,
rqst.rq_iov = iov;
rqst.rq_nvec = 2;
rqst.rq_pages = wdata->pages;
rqst.rq_offset = wdata->page_offset;
rqst.rq_npages = wdata->nr_pages;
rqst.rq_pagesz = wdata->pagesz;
rqst.rq_tailsz = wdata->tailsz;