[PATCH 2/3] crypto: af_alg - Allow to link sgl
Allow to link af_alg sgls.
Signed-off-by: Tadeusz Struk
---
crypto/af_alg.c | 16
include/crypto/if_alg.h |4 +++-
2 files changed, 15 insertions(+), 5 deletions(-)
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index 76d739d..99608f2 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -374,7 +374,8 @@ int af_alg_make_sg(struct af_alg_sgl *sgl, void __user
*addr, int len,
err = 0;
- sg_init_table(sgl->sg, npages);
+ /* Add one extra for linking */
+ sg_init_table(sgl->sg, npages + 1);
for (i = 0; i < npages; i++) {
int plen = min_t(int, len, PAGE_SIZE - off);
@@ -385,20 +386,27 @@ int af_alg_make_sg(struct af_alg_sgl *sgl, void __user
*addr, int len,
len -= plen;
err += plen;
}
+ sg_mark_end(sgl->sg + npages - 1);
+ sgl->npages = npages;
out:
return err;
}
EXPORT_SYMBOL_GPL(af_alg_make_sg);
+void af_alg_link_sg(struct af_alg_sgl *sgl_prev, struct af_alg_sgl *sgl_new)
+{
+ sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1);
+ sg_chain(sgl_prev->sg, sgl_prev->npages + 1, sgl_new->sg);
+}
+EXPORT_SYMBOL(af_alg_link_sg);
+
void af_alg_free_sg(struct af_alg_sgl *sgl)
{
int i;
- i = 0;
- do {
+ for (i = 0; i < sgl->npages; i++)
put_page(sgl->pages[i]);
- } while (!sg_is_last(sgl->sg + (i++)));
}
EXPORT_SYMBOL_GPL(af_alg_free_sg);
diff --git a/include/crypto/if_alg.h b/include/crypto/if_alg.h
index 5c7b6c5..0908050 100644
--- a/include/crypto/if_alg.h
+++ b/include/crypto/if_alg.h
@@ -58,8 +58,9 @@ struct af_alg_type {
};
struct af_alg_sgl {
- struct scatterlist sg[ALG_MAX_PAGES];
+ struct scatterlist sg[ALG_MAX_PAGES + 1];
struct page *pages[ALG_MAX_PAGES];
+ unsigned int npages;
};
int af_alg_register_type(const struct af_alg_type *type);
@@ -71,6 +72,7 @@ int af_alg_accept(struct sock *sk, struct socket *newsock);
int af_alg_make_sg(struct af_alg_sgl *sgl, void __user *addr, int len,
int write);
void af_alg_free_sg(struct af_alg_sgl *sgl);
+void af_alg_link_sg(struct af_alg_sgl *sgl_prev, struct af_alg_sgl *sgl_new);
int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con);
--
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[PATCH 2/3] crypto: af_alg - Allow to link sgl
Allow to link af_alg sgls.
Signed-off-by: Tadeusz Struk tadeusz.st...@intel.com
---
crypto/af_alg.c | 16
include/crypto/if_alg.h |4 +++-
2 files changed, 15 insertions(+), 5 deletions(-)
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index 76d739d..99608f2 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -374,7 +374,8 @@ int af_alg_make_sg(struct af_alg_sgl *sgl, void __user
*addr, int len,
err = 0;
- sg_init_table(sgl-sg, npages);
+ /* Add one extra for linking */
+ sg_init_table(sgl-sg, npages + 1);
for (i = 0; i npages; i++) {
int plen = min_t(int, len, PAGE_SIZE - off);
@@ -385,20 +386,27 @@ int af_alg_make_sg(struct af_alg_sgl *sgl, void __user
*addr, int len,
len -= plen;
err += plen;
}
+ sg_mark_end(sgl-sg + npages - 1);
+ sgl-npages = npages;
out:
return err;
}
EXPORT_SYMBOL_GPL(af_alg_make_sg);
+void af_alg_link_sg(struct af_alg_sgl *sgl_prev, struct af_alg_sgl *sgl_new)
+{
+ sg_unmark_end(sgl_prev-sg + sgl_prev-npages - 1);
+ sg_chain(sgl_prev-sg, sgl_prev-npages + 1, sgl_new-sg);
+}
+EXPORT_SYMBOL(af_alg_link_sg);
+
void af_alg_free_sg(struct af_alg_sgl *sgl)
{
int i;
- i = 0;
- do {
+ for (i = 0; i sgl-npages; i++)
put_page(sgl-pages[i]);
- } while (!sg_is_last(sgl-sg + (i++)));
}
EXPORT_SYMBOL_GPL(af_alg_free_sg);
diff --git a/include/crypto/if_alg.h b/include/crypto/if_alg.h
index 5c7b6c5..0908050 100644
--- a/include/crypto/if_alg.h
+++ b/include/crypto/if_alg.h
@@ -58,8 +58,9 @@ struct af_alg_type {
};
struct af_alg_sgl {
- struct scatterlist sg[ALG_MAX_PAGES];
+ struct scatterlist sg[ALG_MAX_PAGES + 1];
struct page *pages[ALG_MAX_PAGES];
+ unsigned int npages;
};
int af_alg_register_type(const struct af_alg_type *type);
@@ -71,6 +72,7 @@ int af_alg_accept(struct sock *sk, struct socket *newsock);
int af_alg_make_sg(struct af_alg_sgl *sgl, void __user *addr, int len,
int write);
void af_alg_free_sg(struct af_alg_sgl *sgl);
+void af_alg_link_sg(struct af_alg_sgl *sgl_prev, struct af_alg_sgl *sgl_new);
int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con);
--
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