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authorPavel Shilovsky <pshilov@microsoft.com>2016-10-25 02:59:57 +0300
committerSteve French <smfrench@gmail.com>2017-02-02 01:46:35 +0300
commitcb200bd6264a80c04e09e8635fa4f3901cabdaef (patch)
tree40cab9532abad0920fb8ff05573ac0a1b4bac931 /fs/cifs
parent738f9de5cdb9175c19d24cfdf90b4543fc3b47bf (diff)
downloadlinux-cb200bd6264a80c04e09e8635fa4f3901cabdaef.tar.xz
CIFS: Separate SMB2 sync header processing
Do not process RFC1001 length in smb2_hdr_assemble() because it is not a part of SMB2 header. This allows to cleanup the code and adds a possibility combine several SMB2 packets into one for compounding. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/smb2pdu.c50
-rw-r--r--fs/cifs/smb2pdu.h5
2 files changed, 35 insertions, 20 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 438c4b108c07..f6ba2c03f7cc 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -79,25 +79,9 @@ static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
static void
-smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
+smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
const struct cifs_tcon *tcon)
{
- struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
- struct smb2_sync_hdr *shdr = get_sync_hdr(hdr);
- char *temp = (char *)hdr;
- /* lookup word count ie StructureSize from table */
- __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
-
- /*
- * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
- * largest operations (Create)
- */
- memset(temp, 0, 256);
-
- /* Note this is only network field converted to big endian */
- hdr->smb2_buf_length =
- cpu_to_be32(parmsize + sizeof(struct smb2_sync_hdr));
-
shdr->ProtocolId = SMB2_PROTO_NUMBER;
shdr->StructureSize = cpu_to_le16(64);
shdr->Command = smb2_cmd;
@@ -149,7 +133,6 @@ smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
shdr->Flags |= SMB2_FLAGS_SIGNED;
out:
- pdu->StructureSize2 = cpu_to_le16(parmsize);
return;
}
@@ -290,6 +273,26 @@ out:
return rc;
}
+static void
+fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
+ unsigned int *total_len)
+{
+ struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
+ /* lookup word count ie StructureSize from table */
+ __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
+
+ /*
+ * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
+ * largest operations (Create)
+ */
+ memset(buf, 0, 256);
+
+ smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
+ spdu->StructureSize2 = cpu_to_le16(parmsize);
+
+ *total_len = parmsize + sizeof(struct smb2_sync_hdr);
+}
+
/*
* 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
@@ -299,7 +302,9 @@ static int
small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
void **request_buf)
{
- int rc = 0;
+ int rc;
+ unsigned int total_len;
+ struct smb2_pdu *pdu;
rc = smb2_reconnect(smb2_command, tcon);
if (rc)
@@ -312,7 +317,12 @@ small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
return -ENOMEM;
}
- smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
+ pdu = (struct smb2_pdu *)(*request_buf);
+
+ fill_small_buf(smb2_command, tcon, get_sync_hdr(pdu), &total_len);
+
+ /* Note this is only network field converted to big endian */
+ pdu->hdr.smb2_buf_length = cpu_to_be32(total_len);
if (tcon != NULL) {
#ifdef CONFIG_CIFS_STATS2
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index 8dd24b73d974..052342da4844 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -117,6 +117,11 @@ struct smb2_sync_hdr {
__u8 Signature[16];
} __packed;
+struct smb2_sync_pdu {
+ struct smb2_sync_hdr sync_hdr;
+ __le16 StructureSize2; /* size of wct area (varies, request specific) */
+} __packed;
+
struct smb2_hdr {
__be32 smb2_buf_length; /* big endian on wire */
/* length is only two or three bytes - with */