linux-kernel - [PATCH 02/22] iov_iter: iov_iter_copy_from

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Message-Id: <1350918922-6096-3-git-send-email-dave.kleikamp@oracle.com>
Date:	Mon, 22 Oct 2012 10:15:02 -0500
From:	Dave Kleikamp <dave.kleikamp@...cle.com>
To:	linux-fsdevel@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Zach Brown <zab@...bo.net>,
	"Maxim V. Patlasov" <mpatlasov@...allels.com>,
	Dave Kleikamp <dave.kleikamp@...cle.com>
Subject: [PATCH 02/22] iov_iter: iov_iter_copy_from_user() should use non-atomic copy

Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
---
 mm/iov-iter.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/mm/iov-iter.c b/mm/iov-iter.c
index 83f7594..5c4f3a5 100644
--- a/mm/iov-iter.c
+++ b/mm/iov-iter.c
@@ -6,8 +6,8 @@
 #include <linux/highmem.h>
 #include <linux/pagemap.h>
 
-static size_t __iovec_copy_from_user_inatomic(char *vaddr,
-			const struct iovec *iov, size_t base, size_t bytes)
+static size_t __iovec_copy_from_user(char *vaddr, const struct iovec *iov,
+				     size_t base, size_t bytes, int atomic)
 {
 	size_t copied = 0, left = 0;
 
@@ -16,7 +16,10 @@ static size_t __iovec_copy_from_user_inatomic(char *vaddr,
 		int copy = min(bytes, iov->iov_len - base);
 
 		base = 0;
-		left = __copy_from_user_inatomic(vaddr, buf, copy);
+		if (atomic)
+			left = __copy_from_user_inatomic(vaddr, buf, copy);
+		else
+			left = __copy_from_user(vaddr, buf, copy);
 		copied += copy;
 		bytes -= copy;
 		vaddr += copy;
@@ -47,8 +50,8 @@ size_t iov_iter_copy_from_user_atomic(struct page *page,
 		left = __copy_from_user_inatomic(kaddr + offset, buf, bytes);
 		copied = bytes - left;
 	} else {
-		copied = __iovec_copy_from_user_inatomic(kaddr + offset,
-						i->iov, i->iov_offset, bytes);
+		copied = __iovec_copy_from_user(kaddr + offset, i->iov,
+						i->iov_offset, bytes, 1);
 	}
 	kunmap_atomic(kaddr);
 
@@ -75,8 +78,8 @@ size_t iov_iter_copy_from_user(struct page *page,
 		left = __copy_from_user(kaddr + offset, buf, bytes);
 		copied = bytes - left;
 	} else {
-		copied = __iovec_copy_from_user_inatomic(kaddr + offset,
-						i->iov, i->iov_offset, bytes);
+		copied = __iovec_copy_from_user(kaddr + offset, i->iov,
+						i->iov_offset, bytes, 0);
 	}
 	kunmap(page);
 	return copied;
-- 
1.7.12.3

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