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CIFS: Separate protocol-specific code from cifs_readv_receive code

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Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
This commit is contained in:
Pavel Shilovsky 2012-03-23 14:28:03 -04:00 committed by Jeff Layton
parent d4e4854fd1
commit 5ffef7bf1d
5 changed files with 53 additions and 34 deletions
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12
fs/cifs/cifsglob.h
View file

@ -341,6 +341,18 @@ has_credits(struct TCP_Server_Info *server, int *credits)
return num > 0;
}
static inline size_t
header_size(void)
{
return sizeof(struct smb_hdr);
}
static inline size_t
max_header_size(void)
{
return MAX_CIFS_HDR_SIZE;
}
/*
* Macros to allow the TCP_Server_Info->net field and related code to drop out
* when CONFIG_NET_NS isn't set.

2
fs/cifs/cifsproto.h
View file

@ -106,7 +106,7 @@ extern int cifs_convert_address(struct sockaddr *dst, const char *src, int len);
extern int cifs_set_port(struct sockaddr *addr, const unsigned short int port);
extern int cifs_fill_sockaddr(struct sockaddr *dst, const char *src, int len,
const unsigned short int port);
extern int map_smb_to_linux_error(struct smb_hdr *smb, bool logErr);
extern int map_smb_to_linux_error(char *buf, bool logErr);
extern void header_assemble(struct smb_hdr *, char /* command */ ,
const struct cifs_tcon *, int /* length of
fixed section (word count) in two byte units */);

58
fs/cifs/cifssmb.c
View file

@ -1414,8 +1414,7 @@ cifs_readdata_free(struct cifs_readdata *rdata)
static int
cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
READ_RSP *rsp = (READ_RSP *)server->smallbuf;
unsigned int rfclen = be32_to_cpu(rsp->hdr.smb_buf_length);
unsigned int rfclen = get_rfc1002_length(server->smallbuf);
int remaining = rfclen + 4 - server->total_read;
struct cifs_readdata *rdata = mid->callback_data;
@ -1424,7 +1423,7 @@ cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
length = cifs_read_from_socket(server, server->bigbuf,
min_t(unsigned int, remaining,
CIFSMaxBufSize + MAX_CIFS_HDR_SIZE));
CIFSMaxBufSize + max_header_size()));
if (length < 0)
return length;
server->total_read += length;
@ -1435,14 +1434,35 @@ cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
return 0;
}
static inline size_t
read_rsp_size(void)
{
return sizeof(READ_RSP);
}
static inline unsigned int
read_data_offset(char *buf)
{
READ_RSP *rsp = (READ_RSP *)buf;
return le16_to_cpu(rsp->DataOffset);
}
static inline unsigned int
read_data_length(char *buf)
{
READ_RSP *rsp = (READ_RSP *)buf;
return (le16_to_cpu(rsp->DataLengthHigh) << 16) +
le16_to_cpu(rsp->DataLength);
}
static int
cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
int length, len;
unsigned int data_offset, remaining, data_len;
struct cifs_readdata *rdata = mid->callback_data;
READ_RSP *rsp = (READ_RSP *)server->smallbuf;
unsigned int rfclen = be32_to_cpu(rsp->hdr.smb_buf_length) + 4;
char *buf = server->smallbuf;
unsigned int buflen = get_rfc1002_length(buf) + 4;
u64 eof;
pgoff_t eof_index;
struct page *page, *tpage;
@ -1455,10 +1475,9 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
* can if there's not enough data. At this point, we've read down to
* the Mid.
*/
len = min_t(unsigned int, rfclen, sizeof(*rsp)) -
sizeof(struct smb_hdr) + 1;
len = min_t(unsigned int, buflen, read_rsp_size()) - header_size() + 1;
rdata->iov[0].iov_base = server->smallbuf + sizeof(struct smb_hdr) - 1;
rdata->iov[0].iov_base = buf + header_size() - 1;
rdata->iov[0].iov_len = len;
length = cifs_readv_from_socket(server, rdata->iov, 1, len);
@ -1467,7 +1486,7 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
server->total_read += length;
/* Was the SMB read successful? */
rdata->result = map_smb_to_linux_error(&rsp->hdr, false);
rdata->result = map_smb_to_linux_error(buf, false);
if (rdata->result != 0) {
cFYI(1, "%s: server returned error %d", __func__,
rdata->result);
@ -1475,14 +1494,14 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
}
/* Is there enough to get to the rest of the READ_RSP header? */
if (server->total_read < sizeof(READ_RSP)) {
if (server->total_read < read_rsp_size()) {
cFYI(1, "%s: server returned short header. got=%u expected=%zu",
__func__, server->total_read, sizeof(READ_RSP));
__func__, server->total_read, read_rsp_size());
rdata->result = -EIO;
return cifs_readv_discard(server, mid);
}
data_offset = le16_to_cpu(rsp->DataOffset) + 4;
data_offset = read_data_offset(buf) + 4;
if (data_offset < server->total_read) {
/*
* win2k8 sometimes sends an offset of 0 when the read
@ -1506,7 +1525,7 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
len = data_offset - server->total_read;
if (len > 0) {
/* read any junk before data into the rest of smallbuf */
rdata->iov[0].iov_base = server->smallbuf + server->total_read;
rdata->iov[0].iov_base = buf + server->total_read;
rdata->iov[0].iov_len = len;
length = cifs_readv_from_socket(server, rdata->iov, 1, len);
if (length < 0)
@ -1515,15 +1534,14 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
}
/* set up first iov for signature check */
rdata->iov[0].iov_base = server->smallbuf;
rdata->iov[0].iov_base = buf;
rdata->iov[0].iov_len = server->total_read;
cFYI(1, "0: iov_base=%p iov_len=%zu",
rdata->iov[0].iov_base, rdata->iov[0].iov_len);
/* how much data is in the response? */
data_len = le16_to_cpu(rsp->DataLengthHigh) << 16;
data_len += le16_to_cpu(rsp->DataLength);
if (data_offset + data_len > rfclen) {
data_len = read_data_length(buf);
if (data_offset + data_len > buflen) {
/* data_len is corrupt -- discard frame */
rdata->result = -EIO;
return cifs_readv_discard(server, mid);
@ -1602,11 +1620,11 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
rdata->bytes = length;
cFYI(1, "total_read=%u rfclen=%u remaining=%u", server->total_read,
rfclen, remaining);
cFYI(1, "total_read=%u buflen=%u remaining=%u", server->total_read,
buflen, remaining);
/* discard anything left over */
if (server->total_read < rfclen)
if (server->total_read < buflen)
return cifs_readv_discard(server, mid);
dequeue_mid(mid, false);

12
fs/cifs/connect.c
View file

@ -338,18 +338,6 @@ cifs_echo_request(struct work_struct *work)
queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
}
static inline size_t
header_size(void)
{
return sizeof(struct smb_hdr);
}
static inline size_t
max_header_size(void)
{
return MAX_CIFS_HDR_SIZE;
}
static bool
allocate_buffers(struct TCP_Server_Info *server)
{

3
fs/cifs/netmisc.c
View file

@ -836,8 +836,9 @@ ntstatus_to_dos(__u32 ntstatus, __u8 *eclass, __u16 *ecode)
}
int
map_smb_to_linux_error(struct smb_hdr *smb, bool logErr)
map_smb_to_linux_error(char *buf, bool logErr)
{
struct smb_hdr *smb = (struct smb_hdr *)buf;
unsigned int i;
int rc = -EIO; /* if transport error smb error may not be set */
__u8 smberrclass;