From b8f57ee8aad414a3122bff72d7968a94baacb9b6 Mon Sep 17 00:00:00 2001 From: Pavel Shilovsky Date: Wed, 23 Nov 2016 15:31:54 -0800 Subject: [PATCH] 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: Pavel Shilovsky --- fs/cifs/cifsproto.h | 3 ++ fs/cifs/smb2pdu.c | 89 ++++++++++++++++++++++++++++++++++++++++------------- fs/cifs/smb2pdu.h | 5 +-- fs/cifs/transport.c | 2 +- 4 files changed, 74 insertions(+), 25 deletions(-) diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index 7b20993..711718c 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -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 */ , diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index f6ba2c0..d1a9037 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -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); diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h index 052342d..35ff9fa 100644 --- a/fs/cifs/smb2pdu.h +++ b/fs/cifs/smb2pdu.h @@ -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 */ diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c index dacfdf0..729e5b7 100644 --- a/fs/cifs/transport.c +++ b/fs/cifs/transport.c @@ -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) -- 2.7.4