提交 b8f57ee8 编写于 作者: P Pavel Shilovsky 提交者: Steve French

CIFS: Separate RFC1001 length processing for SMB2 read

Allocate and initialize SMB2 read request without RFC1001 length
field to directly call cifs_send_recv() rather than SendReceive2()
in a read codepath.
Signed-off-by: NPavel Shilovsky <pshilov@microsoft.com>
上级 cb200bd6
......@@ -79,6 +79,9 @@ extern int cifs_call_async(struct TCP_Server_Info *server,
struct smb_rqst *rqst,
mid_receive_t *receive, mid_callback_t *callback,
void *cbdata, const int flags);
extern int cifs_send_recv(const unsigned int xid, struct cifs_ses *ses,
struct smb_rqst *rqst, int *resp_buf_type,
const int flags, struct kvec *resp_iov);
extern int SendReceive(const unsigned int /* xid */ , struct cifs_ses *,
struct smb_hdr * /* input */ ,
struct smb_hdr * /* out */ ,
......
......@@ -293,10 +293,46 @@ fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
*total_len = parmsize + sizeof(struct smb2_sync_hdr);
}
/* init request without RFC1001 length at the beginning */
static int
smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
void **request_buf, unsigned int *total_len)
{
int rc;
struct smb2_sync_hdr *shdr;
rc = smb2_reconnect(smb2_command, tcon);
if (rc)
return rc;
/* BB eventually switch this to SMB2 specific small buf size */
*request_buf = cifs_small_buf_get();
if (*request_buf == NULL) {
/* BB should we add a retry in here if not a writepage? */
return -ENOMEM;
}
shdr = (struct smb2_sync_hdr *)(*request_buf);
fill_small_buf(smb2_command, tcon, shdr, total_len);
if (tcon != NULL) {
#ifdef CONFIG_CIFS_STATS2
uint16_t com_code = le16_to_cpu(smb2_command);
cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
#endif
cifs_stats_inc(&tcon->num_smbs_sent);
}
return rc;
}
/*
* Allocate and return pointer to an SMB request hdr, and set basic
* SMB information in the SMB header. If the return code is zero, this
* function must have filled in request_buf pointer.
* function must have filled in request_buf pointer. The returned buffer
* has RFC1001 length at the beginning.
*/
static int
small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
......@@ -2140,16 +2176,17 @@ smb2_new_read_req(void **buf, unsigned int *total_len,
int request_type)
{
int rc = -EACCES;
struct smb2_read_req *req = NULL;
struct smb2_read_plain_req *req = NULL;
struct smb2_sync_hdr *shdr;
rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
total_len);
if (rc)
return rc;
if (io_parms->tcon->ses->server == NULL)
return -ECONNABORTED;
shdr = get_sync_hdr(req);
shdr = &req->sync_hdr;
shdr->ProcessId = cpu_to_le32(io_parms->pid);
req->PersistentFileId = io_parms->persistent_fid;
......@@ -2163,9 +2200,9 @@ smb2_new_read_req(void **buf, unsigned int *total_len,
if (request_type & CHAINED_REQUEST) {
if (!(request_type & END_OF_CHAIN)) {
/* 4 for rfc1002 length field */
shdr->NextCommand =
cpu_to_le32(get_rfc1002_length(req) + 4);
/* next 8-byte aligned request */
*total_len = DIV_ROUND_UP(*total_len, 8) * 8;
shdr->NextCommand = cpu_to_le32(*total_len);
} else /* END_OF_CHAIN */
shdr->NextCommand = 0;
if (request_type & RELATED_REQUEST) {
......@@ -2186,8 +2223,6 @@ smb2_new_read_req(void **buf, unsigned int *total_len,
req->RemainingBytes = 0;
*buf = req;
/* 4 for rfc1002 length field */
*total_len = get_rfc1002_length(req) + 4;
return rc;
}
......@@ -2264,6 +2299,7 @@ smb2_async_readv(struct cifs_readdata *rdata)
.rq_nvec = 2 };
struct TCP_Server_Info *server;
unsigned int total_len;
__be32 req_len;
cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
__func__, rdata->offset, rdata->bytes);
......@@ -2290,12 +2326,14 @@ smb2_async_readv(struct cifs_readdata *rdata)
return rc;
}
shdr = get_sync_hdr(buf);
/* 4 for rfc1002 length field */
rdata->iov[0].iov_len = 4;
rdata->iov[0].iov_base = buf;
rdata->iov[1].iov_len = total_len - 4;
rdata->iov[1].iov_base = buf + 4;
req_len = cpu_to_be32(total_len);
rdata->iov[0].iov_base = &req_len;
rdata->iov[0].iov_len = sizeof(__be32);
rdata->iov[1].iov_base = buf;
rdata->iov[1].iov_len = total_len;
shdr = (struct smb2_sync_hdr *)buf;
if (rdata->credits) {
shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
......@@ -2327,24 +2365,31 @@ SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
unsigned int *nbytes, char **buf, int *buf_type)
{
int resp_buftype, rc = -EACCES;
struct smb2_read_plain_req *req = NULL;
struct smb2_read_rsp *rsp = NULL;
struct smb2_sync_hdr *shdr;
struct kvec iov[1];
struct kvec iov[2];
struct kvec rsp_iov;
unsigned int total_len;
char *req;
__be32 req_len;
struct smb_rqst rqst = { .rq_iov = iov,
.rq_nvec = 2 };
*nbytes = 0;
rc = smb2_new_read_req((void **)&req, &total_len, io_parms, 0, 0);
if (rc)
return rc;
iov[0].iov_base = buf;
iov[0].iov_len = total_len;
req_len = cpu_to_be32(total_len);
rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
&resp_buftype, CIFS_LOG_ERROR, &rsp_iov);
cifs_small_buf_release(iov[0].iov_base);
iov[0].iov_base = &req_len;
iov[0].iov_len = sizeof(__be32);
iov[1].iov_base = req;
iov[1].iov_len = total_len;
rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst, &resp_buftype,
CIFS_LOG_ERROR, &rsp_iov);
cifs_small_buf_release(req);
rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
shdr = get_sync_hdr(rsp);
......
......@@ -823,8 +823,9 @@ struct smb2_flush_rsp {
#define SMB2_CHANNEL_RDMA_V1 0x00000001 /* SMB3 or later */
#define SMB2_CHANNEL_RDMA_V1_INVALIDATE 0x00000001 /* SMB3.02 or later */
struct smb2_read_req {
struct smb2_hdr hdr;
/* SMB2 read request without RFC1001 length at the beginning */
struct smb2_read_plain_req {
struct smb2_sync_hdr sync_hdr;
__le16 StructureSize; /* Must be 49 */
__u8 Padding; /* offset from start of SMB2 header to place read */
__u8 Flags; /* MBZ unless SMB3.02 or later */
......
......@@ -666,7 +666,7 @@ cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
return mid;
}
static int
int
cifs_send_recv(const unsigned int xid, struct cifs_ses *ses,
struct smb_rqst *rqst, int *resp_buf_type, const int flags,
struct kvec *resp_iov)
......
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