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Commit 6509f50c authored by Long Li's avatar Long Li Committed by Steve French
Browse files

CIFS: SMBD: Support page offset in RDMA recv 



RDMA recv function needs to place data to the correct place starting at
page offset.

Signed-off-by: default avatarLong Li <longli@microsoft.com>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent b6903bcf

fs/cifs/smbdirect.c

+11 −7
Original line number Diff line number Diff line
@@ -2004,10 +2004,12 @@ static int smbd_recv_buf(struct smbd_connection *info, char *buf, 
 * return value: actual data read

 */

static int smbd_recv_page(struct smbd_connection *info,

		struct page *page, unsigned int to_read)

		struct page *page, unsigned int page_offset,

		unsigned int to_read)

{

	int ret;

	char *to_address;

	void *page_address;



	/* make sure we have the page ready for read */

	ret = wait_event_interruptible(
@@ -2015,16 +2017,17 @@ static int smbd_recv_page(struct smbd_connection *info, 
		info->reassembly_data_length >= to_read ||

			info->transport_status != SMBD_CONNECTED);

	if (ret)

		return 0;

		return ret;



	/* now we can read from reassembly queue and not sleep */

	to_address = kmap_atomic(page);

	page_address = kmap_atomic(page);

	to_address = (char *) page_address + page_offset;



	log_read(INFO, "reading from page=%p address=%p to_read=%d\n",

		page, to_address, to_read);



	ret = smbd_recv_buf(info, to_address, to_read);

	kunmap_atomic(to_address);

	kunmap_atomic(page_address);



	return ret;

}
@@ -2038,7 +2041,7 @@ int smbd_recv(struct smbd_connection *info, struct msghdr *msg) 
{

	char *buf;

	struct page *page;

	unsigned int to_read;

	unsigned int to_read, page_offset;

	int rc;



	info->smbd_recv_pending++;
@@ -2052,15 +2055,16 @@ int smbd_recv(struct smbd_connection *info, struct msghdr *msg) 


	case READ | ITER_BVEC:

		page = msg->msg_iter.bvec->bv_page;

		page_offset = msg->msg_iter.bvec->bv_offset;

		to_read = msg->msg_iter.bvec->bv_len;

		rc = smbd_recv_page(info, page, to_read);

		rc = smbd_recv_page(info, page, page_offset, to_read);

		break;



	default:

		/* It's a bug in upper layer to get there */

		cifs_dbg(VFS, "CIFS: invalid msg type %d\n",

			msg->msg_iter.type);

		rc = -EIO;

		rc = -EINVAL;

	}



	info->smbd_recv_pending--;