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net: move iov_pages() to net/core/iovec.c 

To let it be reused and reduce code duplication.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2013-08-06 17:45:03 +08:00 committed by David S. Miller
parent 6261d983f2
commit b4bf07771f
4 changed files with 26 additions and 46 deletions
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23
drivers/net/macvtap.c
View File

@ -698,29 +698,6 @@ static int macvtap_skb_to_vnet_hdr(const struct sk_buff *skb,
return 0;
}
static unsigned long iov_pages(const struct iovec *iv, int offset,
unsigned long nr_segs)
{
unsigned long seg, base;
int pages = 0, len, size;
while (nr_segs && (offset >= iv->iov_len)) {
offset -= iv->iov_len;
++iv;
--nr_segs;
}
for (seg = 0; seg < nr_segs; seg++) {
base = (unsigned long)iv[seg].iov_base + offset;
len = iv[seg].iov_len - offset;
size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT;
pages += size;
offset = 0;
}
return pages;
}
/* Get packet from user space buffer */
static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,
const struct iovec *iv, unsigned long total_len,

23
drivers/net/tun.c
View File

@ -1041,29 +1041,6 @@ static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from,
return 0;
}
static unsigned long iov_pages(const struct iovec *iv, int offset,
unsigned long nr_segs)
{
unsigned long seg, base;
int pages = 0, len, size;
while (nr_segs && (offset >= iv->iov_len)) {
offset -= iv->iov_len;
++iv;
--nr_segs;
}
for (seg = 0; seg < nr_segs; seg++) {
base = (unsigned long)iv[seg].iov_base + offset;
len = iv[seg].iov_len - offset;
size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT;
pages += size;
offset = 0;
}
return pages;
}
/* Get packet from user space buffer */
static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
void *msg_control, const struct iovec *iv,

2
include/linux/socket.h
View File

@ -313,6 +313,8 @@ extern int csum_partial_copy_fromiovecend(unsigned char *kdata,
struct iovec *iov,
int offset,
unsigned int len, __wsum *csump);
extern unsigned long iov_pages(const struct iovec *iov, int offset,
unsigned long nr_segs);
extern int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr_storage *address, int mode);
extern int memcpy_toiovecend(const struct iovec *v, unsigned char *kdata,

24
net/core/iovec.c
View File

@ -212,3 +212,27 @@ out_fault:
goto out;
}
EXPORT_SYMBOL(csum_partial_copy_fromiovecend);
unsigned long iov_pages(const struct iovec *iov, int offset,
unsigned long nr_segs)
{
unsigned long seg, base;
int pages = 0, len, size;
while (nr_segs && (offset >= iov->iov_len)) {
offset -= iov->iov_len;
++iov;
--nr_segs;
}
for (seg = 0; seg < nr_segs; seg++) {
base = (unsigned long)iov[seg].iov_base + offset;
len = iov[seg].iov_len - offset;
size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT;
pages += size;
offset = 0;
}
return pages;
}
EXPORT_SYMBOL(iov_pages);