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9pfs: make pdu_{,un}marshal proper functions 

Factor out v9fs_iov_v{,un}marshal. Implement pdu_{,un}marshal with those
functions.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This commit is contained in:
Wei Liu 2015-12-02 14:22:04 +00:00 committed by Aneesh Kumar K.V
parent dc295f8353
commit 0e2082d9e5
4 changed files with 63 additions and 16 deletions
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42
fsdev/9p-iov-marshal.c
View File

@ -76,15 +76,13 @@ ssize_t v9fs_pack(struct iovec *in_sg, int in_num, size_t offset,
return v9fs_packunpack((void *)src, in_sg, in_num, offset, size, 1);
}
ssize_t v9fs_iov_unmarshal(struct iovec *out_sg, int out_num, size_t offset,
int bswap, const char *fmt, ...)
ssize_t v9fs_iov_vunmarshal(struct iovec *out_sg, int out_num, size_t offset,
int bswap, const char *fmt, va_list ap)
{
int i;
va_list ap;
ssize_t copied = 0;
size_t old_offset = offset;
va_start(ap, fmt);
for (i = 0; fmt[i]; i++) {
switch (fmt[i]) {
case 'b': {
@ -180,25 +178,34 @@ ssize_t v9fs_iov_unmarshal(struct iovec *out_sg, int out_num, size_t offset,
break;
}
if (copied < 0) {
va_end(ap);
return copied;
}
offset += copied;
}
va_end(ap);
return offset - old_offset;
}
ssize_t v9fs_iov_marshal(struct iovec *in_sg, int in_num, size_t offset,
int bswap, const char *fmt, ...)
ssize_t v9fs_iov_unmarshal(struct iovec *out_sg, int out_num, size_t offset,
int bswap, const char *fmt, ...)
{
ssize_t ret;
va_list ap;
va_start(ap, fmt);
ret = v9fs_iov_vunmarshal(out_sg, out_num, offset, bswap, fmt, ap);
va_end(ap);
return ret;
}
ssize_t v9fs_iov_vmarshal(struct iovec *in_sg, int in_num, size_t offset,
int bswap, const char *fmt, va_list ap)
{
int i;
va_list ap;
ssize_t copied = 0;
size_t old_offset = offset;
va_start(ap, fmt);
for (i = 0; fmt[i]; i++) {
switch (fmt[i]) {
case 'b': {
@ -290,12 +297,23 @@ ssize_t v9fs_iov_marshal(struct iovec *in_sg, int in_num, size_t offset,
break;
}
if (copied < 0) {
va_end(ap);
return copied;
}
offset += copied;
}
va_end(ap);
return offset - old_offset;
}
ssize_t v9fs_iov_marshal(struct iovec *in_sg, int in_num, size_t offset,
int bswap, const char *fmt, ...)
{
ssize_t ret;
va_list ap;
va_start(ap, fmt);
ret = v9fs_iov_vmarshal(in_sg, in_num, offset, bswap, fmt, ap);
va_end(ap);
return ret;
}

5
fsdev/9p-iov-marshal.h
View File

@ -10,4 +10,9 @@ ssize_t v9fs_iov_unmarshal(struct iovec *out_sg, int out_num, size_t offset,
int bswap, const char *fmt, ...);
ssize_t v9fs_iov_marshal(struct iovec *in_sg, int in_num, size_t offset,
int bswap, const char *fmt, ...);
ssize_t v9fs_iov_vunmarshal(struct iovec *out_sg, int out_num, size_t offset,
int bswap, const char *fmt, va_list ap);
ssize_t v9fs_iov_vmarshal(struct iovec *in_sg, int in_num, size_t offset,
int bswap, const char *fmt, va_list ap);
#endif

26
hw/9pfs/virtio-9p.c
View File

@ -39,6 +39,32 @@ enum {
Oappend = 0x80,
};
ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
{
ssize_t ret;
va_list ap;
va_start(ap, fmt);
ret = v9fs_iov_vmarshal(pdu->elem.in_sg, pdu->elem.in_num,
offset, 1, fmt, ap);
va_end(ap);
return ret;
}
ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
{
ssize_t ret;
va_list ap;
va_start(ap, fmt);
ret = v9fs_iov_vunmarshal(pdu->elem.out_sg, pdu->elem.out_num,
offset, 1, fmt, ap);
va_end(ap);
return ret;
}
static int omode_to_uflags(int8_t mode)
{
int ret = 0;

6
hw/9pfs/virtio-9p.h
View File

@ -320,10 +320,8 @@ extern void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs);
extern int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
const char *name, V9fsPath *path);
#define pdu_marshal(pdu, offset, fmt, args...) \
v9fs_iov_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset, 1, fmt, ##args)
#define pdu_unmarshal(pdu, offset, fmt, args...) \
v9fs_iov_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset, 1, fmt, ##args)
ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...);
ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...);
#define TYPE_VIRTIO_9P "virtio-9p-device"
#define VIRTIO_9P(obj) \