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iov_iter.c: get rid of bvec_copy_page_{to,from}_iter() 

Just have copy_page_{to,from}_iter() fall back to kmap_atomic +
copy_{to,from}_iter() + kunmap_atomic() in ITER_BVEC case.  As
the matter of fact, that's what we want to do for any iov_iter
kind that isn't blocking - e.g. ITER_KVEC will also go that way
once we recognize it on iov_iter.c primitives level

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-11-27 14:22:37 -05:00
parent 8442fa46cf
commit d271524a3a
1 changed files with 26 additions and 38 deletions
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64
mm/iov_iter.c
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@ -486,44 +486,6 @@ static size_t copy_from_iter_bvec(void *to, size_t bytes, struct iov_iter *i)
return wanted;
}
static size_t copy_page_to_iter_bvec(struct page *page, size_t offset,
size_t bytes, struct iov_iter *i)
{
void *kaddr = kmap_atomic(page);
size_t wanted = copy_to_iter_bvec(kaddr + offset, bytes, i);
kunmap_atomic(kaddr);
return wanted;
}
static size_t copy_page_from_iter_bvec(struct page *page, size_t offset,
size_t bytes, struct iov_iter *i)
{
void *kaddr = kmap_atomic(page);
size_t wanted = copy_from_iter_bvec(kaddr + offset, bytes, i);
kunmap_atomic(kaddr);
return wanted;
}
size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes,
struct iov_iter *i)
{
if (i->type & ITER_BVEC)
return copy_page_to_iter_bvec(page, offset, bytes, i);
else
return copy_page_to_iter_iovec(page, offset, bytes, i);
}
EXPORT_SYMBOL(copy_page_to_iter);
size_t copy_page_from_iter(struct page *page, size_t offset, size_t bytes,
struct iov_iter *i)
{
if (i->type & ITER_BVEC)
return copy_page_from_iter_bvec(page, offset, bytes, i);
else
return copy_page_from_iter_iovec(page, offset, bytes, i);
}
EXPORT_SYMBOL(copy_page_from_iter);
size_t copy_to_iter(void *addr, size_t bytes, struct iov_iter *i)
{
if (i->type & ITER_BVEC)
@ -542,6 +504,32 @@ size_t copy_from_iter(void *addr, size_t bytes, struct iov_iter *i)
}
EXPORT_SYMBOL(copy_from_iter);
size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes,
struct iov_iter *i)
{
if (i->type & (ITER_BVEC|ITER_KVEC)) {
void *kaddr = kmap_atomic(page);
size_t wanted = copy_to_iter(kaddr + offset, bytes, i);
kunmap_atomic(kaddr);
return wanted;
} else
return copy_page_to_iter_iovec(page, offset, bytes, i);
}
EXPORT_SYMBOL(copy_page_to_iter);
size_t copy_page_from_iter(struct page *page, size_t offset, size_t bytes,
struct iov_iter *i)
{
if (i->type & ITER_BVEC) {
void *kaddr = kmap_atomic(page);
size_t wanted = copy_from_iter(kaddr + offset, bytes, i);
kunmap_atomic(kaddr);
return wanted;
} else
return copy_page_from_iter_iovec(page, offset, bytes, i);
}
EXPORT_SYMBOL(copy_page_from_iter);
size_t iov_iter_zero(size_t bytes, struct iov_iter *i)
{
if (unlikely(bytes > i->count))