From d271524a3a1da99e3809afaa10903cc2905bc9a7 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Thu, 27 Nov 2014 14:22:37 -0500 Subject: [PATCH] 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 --- mm/iov_iter.c | 64 +++++++++++++++++++++------------------------------ 1 file changed, 26 insertions(+), 38 deletions(-) diff --git a/mm/iov_iter.c b/mm/iov_iter.c index 39ad7137f739..17b7144c3165 100644 --- a/mm/iov_iter.c +++ b/mm/iov_iter.c @@ -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))