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Subject[PATCH 10/29] iov_iter: Split copy_from_iter_nocache()
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Split copy_from_iter_nocache() by type.

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

lib/iov_iter.c | 38 +++++++++++++++++++++++---------------
1 file changed, 23 insertions(+), 15 deletions(-)

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 3dba665a1ee9..c57c2171f730 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -972,21 +972,29 @@ static bool no_copy_from_iter_full(void *addr, size_t bytes, struct iov_iter *i)
return false;
}

-static size_t xxx_copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i)
+static size_t iovec_copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i)
{
char *to = addr;
- if (unlikely(iov_iter_is_pipe(i))) {
- WARN_ON(1);
- return 0;
- }
- iterate_and_advance(i, bytes, v,
+ iterate_and_advance_iovec(i, bytes, v,
__copy_from_user_inatomic_nocache((to += v.iov_len) - v.iov_len,
- v.iov_base, v.iov_len),
+ v.iov_base, v.iov_len));
+ return bytes;
+}
+
+static size_t bvec_copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i)
+{
+ char *to = addr;
+ iterate_and_advance_bvec(i, bytes, v,
memcpy_from_page((to += v.bv_len) - v.bv_len, v.bv_page,
- v.bv_offset, v.bv_len),
- memcpy((to += v.iov_len) - v.iov_len, v.iov_base, v.iov_len)
- )
+ v.bv_offset, v.bv_len));
+ return bytes;
+}

+static size_t kvec_copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i)
+{
+ char *to = addr;
+ iterate_and_advance_kvec(i, bytes, v,
+ memcpy((to += v.iov_len) - v.iov_len, v.iov_base, v.iov_len));
return bytes;
}

@@ -2009,7 +2017,7 @@ static const struct iov_iter_ops iovec_iter_ops = {
.copy_to_iter = iovec_copy_to_iter,
.copy_from_iter = iovec_copy_from_iter,
.copy_from_iter_full = iovec_copy_from_iter_full,
- .copy_from_iter_nocache = xxx_copy_from_iter_nocache,
+ .copy_from_iter_nocache = iovec_copy_from_iter_nocache,
.copy_from_iter_full_nocache = xxx_copy_from_iter_full_nocache,
#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
.copy_from_iter_flushcache = xxx_copy_from_iter_flushcache,
@@ -2043,7 +2051,7 @@ static const struct iov_iter_ops kvec_iter_ops = {
.copy_to_iter = kvec_copy_to_iter,
.copy_from_iter = kvec_copy_from_iter,
.copy_from_iter_full = kvec_copy_from_iter_full,
- .copy_from_iter_nocache = xxx_copy_from_iter_nocache,
+ .copy_from_iter_nocache = kvec_copy_from_iter_nocache,
.copy_from_iter_full_nocache = xxx_copy_from_iter_full_nocache,
#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
.copy_from_iter_flushcache = xxx_copy_from_iter_flushcache,
@@ -2077,7 +2085,7 @@ static const struct iov_iter_ops bvec_iter_ops = {
.copy_to_iter = bvec_copy_to_iter,
.copy_from_iter = bvec_copy_from_iter,
.copy_from_iter_full = bvec_copy_from_iter_full,
- .copy_from_iter_nocache = xxx_copy_from_iter_nocache,
+ .copy_from_iter_nocache = bvec_copy_from_iter_nocache,
.copy_from_iter_full_nocache = xxx_copy_from_iter_full_nocache,
#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
.copy_from_iter_flushcache = xxx_copy_from_iter_flushcache,
@@ -2111,7 +2119,7 @@ static const struct iov_iter_ops pipe_iter_ops = {
.copy_to_iter = pipe_copy_to_iter,
.copy_from_iter = no_copy_from_iter,
.copy_from_iter_full = no_copy_from_iter_full,
- .copy_from_iter_nocache = xxx_copy_from_iter_nocache,
+ .copy_from_iter_nocache = no_copy_from_iter,
.copy_from_iter_full_nocache = xxx_copy_from_iter_full_nocache,
#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
.copy_from_iter_flushcache = xxx_copy_from_iter_flushcache,
@@ -2145,7 +2153,7 @@ static const struct iov_iter_ops discard_iter_ops = {
.copy_to_iter = discard_copy_to_iter,
.copy_from_iter = no_copy_from_iter,
.copy_from_iter_full = no_copy_from_iter_full,
- .copy_from_iter_nocache = xxx_copy_from_iter_nocache,
+ .copy_from_iter_nocache = no_copy_from_iter,
.copy_from_iter_full_nocache = xxx_copy_from_iter_full_nocache,
#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
.copy_from_iter_flushcache = xxx_copy_from_iter_flushcache,

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