xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

SUNRPC: Add a bvec array to struct xdr_buf for use with iovec_iter()

Browse Source 
Add a bvec array to struct xdr_buf, and have the client allocate it
when we need to receive data into pages.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust
2018-09-13 12:22:04 -04:00
parent 431f6eb357
commit 9d96acbc7f
5 changed files with 63 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
net/sunrpc/xdr.c
View File

@@ -15,6 +15,7 @@
#include <linux/errno.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/msg_prot.h>
#include <linux/bvec.h>
/*
* XDR functions for basic NFS types
@@ -128,6 +129,39 @@ xdr_terminate_string(struct xdr_buf *buf, const u32 len)
}
EXPORT_SYMBOL_GPL(xdr_terminate_string);
size_t
xdr_buf_pagecount(struct xdr_buf *buf)
{
if (!buf->page_len)
return 0;
return (buf->page_base + buf->page_len + PAGE_SIZE - 1) >> PAGE_SHIFT;
}
int
xdr_alloc_bvec(struct xdr_buf *buf, gfp_t gfp)
{
size_t i, n = xdr_buf_pagecount(buf);
if (n != 0 && buf->bvec == NULL) {
buf->bvec = kmalloc_array(n, sizeof(buf->bvec[0]), gfp);
if (!buf->bvec)
return -ENOMEM;
for (i = 0; i < n; i++) {
buf->bvec[i].bv_page = buf->pages[i];
buf->bvec[i].bv_len = PAGE_SIZE;
buf->bvec[i].bv_offset = 0;
}
}
return 0;
}
void
xdr_free_bvec(struct xdr_buf *buf)
{
kfree(buf->bvec);
buf->bvec = NULL;
}
void
xdr_inline_pages(struct xdr_buf *xdr, unsigned int offset,
struct page **pages, unsigned int base, unsigned int len)