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Subject[PATCH 25/29] iov_iter: Split csum_and_copy_to_iter()
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Split csum_and_copy_to_iter() by type.

Signed-off-by: David Howells <dhowells@redhat.com>
---

lib/iov_iter.c | 68 ++++++++++++++++++++++++++++++++++++++++----------------
1 file changed, 48 insertions(+), 20 deletions(-)

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 8820a9e72815..2f8019e3b09a 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -698,14 +698,15 @@ static __wsum csum_and_memcpy(void *to, const void *from, size_t len,
return csum_block_add(sum, next, off);
}

-static size_t csum_and_copy_to_pipe_iter(const void *addr, size_t bytes,
- __wsum *csum, struct iov_iter *i)
+static size_t pipe_csum_and_copy_to_iter(const void *addr, size_t bytes,
+ void *csump, struct iov_iter *i)
{
struct pipe_inode_info *pipe = i->pipe;
unsigned int p_mask = pipe->ring_size - 1;
unsigned int i_head;
size_t n, r;
size_t off = 0;
+ __wsum *csum = csump;
__wsum sum = *csum;

if (!sanity(i))
@@ -1914,7 +1915,7 @@ static bool no_csum_and_copy_from_iter_full(void *addr, size_t bytes, __wsum *cs
return false;
}

-static size_t xxx_csum_and_copy_to_iter(const void *addr, size_t bytes, void *csump,
+static size_t iovec_csum_and_copy_to_iter(const void *addr, size_t bytes, void *csump,
struct iov_iter *i)
{
const char *from = addr;
@@ -1922,15 +1923,8 @@ static size_t xxx_csum_and_copy_to_iter(const void *addr, size_t bytes, void *cs
__wsum sum, next;
size_t off = 0;

- if (unlikely(iov_iter_is_pipe(i)))
- return csum_and_copy_to_pipe_iter(addr, bytes, csum, i);
-
sum = *csum;
- if (unlikely(iov_iter_is_discard(i))) {
- WARN_ON(1); /* for now */
- return 0;
- }
- iterate_and_advance(i, bytes, v, ({
+ iterate_and_advance_iovec(i, bytes, v, ({
next = csum_and_copy_to_user((from += v.iov_len) - v.iov_len,
v.iov_base,
v.iov_len);
@@ -1939,24 +1933,58 @@ static size_t xxx_csum_and_copy_to_iter(const void *addr, size_t bytes, void *cs
off += v.iov_len;
}
next ? 0 : v.iov_len;
- }), ({
+ }));
+ *csum = sum;
+ return bytes;
+}
+
+static size_t bvec_csum_and_copy_to_iter(const void *addr, size_t bytes, void *csump,
+ struct iov_iter *i)
+{
+ const char *from = addr;
+ __wsum *csum = csump;
+ __wsum sum;
+ size_t off = 0;
+
+ sum = *csum;
+ iterate_and_advance_bvec(i, bytes, v, ({
char *p = kmap_atomic(v.bv_page);
sum = csum_and_memcpy(p + v.bv_offset,
(from += v.bv_len) - v.bv_len,
v.bv_len, sum, off);
kunmap_atomic(p);
off += v.bv_len;
- }),({
+ }));
+ *csum = sum;
+ return bytes;
+}
+
+static size_t kvec_csum_and_copy_to_iter(const void *addr, size_t bytes, void *csump,
+ struct iov_iter *i)
+{
+ const char *from = addr;
+ __wsum *csum = csump;
+ __wsum sum;
+ size_t off = 0;
+
+ sum = *csum;
+ iterate_and_advance_kvec(i, bytes, v, ({
sum = csum_and_memcpy(v.iov_base,
(from += v.iov_len) - v.iov_len,
v.iov_len, sum, off);
off += v.iov_len;
- })
- )
+ }));
*csum = sum;
return bytes;
}

+static size_t discard_csum_and_copy_to_iter(const void *addr, size_t bytes, void *csump,
+ struct iov_iter *i)
+{
+ WARN_ON(1); /* for now */
+ return 0;
+}
+
size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp,
struct iov_iter *i)
{
@@ -2256,7 +2284,7 @@ static const struct iov_iter_ops iovec_iter_ops = {
#ifdef CONFIG_ARCH_HAS_COPY_MC
.copy_mc_to_iter = iovec_copy_mc_to_iter,
#endif
- .csum_and_copy_to_iter = xxx_csum_and_copy_to_iter,
+ .csum_and_copy_to_iter = iovec_csum_and_copy_to_iter,
.csum_and_copy_from_iter = iovec_csum_and_copy_from_iter,
.csum_and_copy_from_iter_full = iovec_csum_and_copy_from_iter_full,

@@ -2290,7 +2318,7 @@ static const struct iov_iter_ops kvec_iter_ops = {
#ifdef CONFIG_ARCH_HAS_COPY_MC
.copy_mc_to_iter = kvec_copy_mc_to_iter,
#endif
- .csum_and_copy_to_iter = xxx_csum_and_copy_to_iter,
+ .csum_and_copy_to_iter = kvec_csum_and_copy_to_iter,
.csum_and_copy_from_iter = kvec_csum_and_copy_from_iter,
.csum_and_copy_from_iter_full = kvec_csum_and_copy_from_iter_full,

@@ -2324,7 +2352,7 @@ static const struct iov_iter_ops bvec_iter_ops = {
#ifdef CONFIG_ARCH_HAS_COPY_MC
.copy_mc_to_iter = bvec_copy_mc_to_iter,
#endif
- .csum_and_copy_to_iter = xxx_csum_and_copy_to_iter,
+ .csum_and_copy_to_iter = bvec_csum_and_copy_to_iter,
.csum_and_copy_from_iter = bvec_csum_and_copy_from_iter,
.csum_and_copy_from_iter_full = bvec_csum_and_copy_from_iter_full,

@@ -2358,7 +2386,7 @@ static const struct iov_iter_ops pipe_iter_ops = {
#ifdef CONFIG_ARCH_HAS_COPY_MC
.copy_mc_to_iter = pipe_copy_mc_to_iter,
#endif
- .csum_and_copy_to_iter = xxx_csum_and_copy_to_iter,
+ .csum_and_copy_to_iter = pipe_csum_and_copy_to_iter,
.csum_and_copy_from_iter = no_csum_and_copy_from_iter,
.csum_and_copy_from_iter_full = no_csum_and_copy_from_iter_full,

@@ -2392,7 +2420,7 @@ static const struct iov_iter_ops discard_iter_ops = {
#ifdef CONFIG_ARCH_HAS_COPY_MC
.copy_mc_to_iter = discard_copy_to_iter,
#endif
- .csum_and_copy_to_iter = xxx_csum_and_copy_to_iter,
+ .csum_and_copy_to_iter = discard_csum_and_copy_to_iter,
.csum_and_copy_from_iter = no_csum_and_copy_from_iter,
.csum_and_copy_from_iter_full = no_csum_and_copy_from_iter_full,


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