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-rw-r--r--fs/readdir.c44
1 files changed, 2 insertions, 42 deletions
diff --git a/fs/readdir.c b/fs/readdir.c
index 19bea591c3f1..6e2623e57b2e 100644
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -27,53 +27,13 @@
/*
* Note the "unsafe_put_user() semantics: we goto a
* label for errors.
- *
- * Also note how we use a "while()" loop here, even though
- * only the biggest size needs to loop. The compiler (well,
- * at least gcc) is smart enough to turn the smaller sizes
- * into just if-statements, and this way we don't need to
- * care whether 'u64' or 'u32' is the biggest size.
- */
-#define unsafe_copy_loop(dst, src, len, type, label) \
- while (len >= sizeof(type)) { \
- unsafe_put_user(get_unaligned((type *)src), \
- (type __user *)dst, label); \
- dst += sizeof(type); \
- src += sizeof(type); \
- len -= sizeof(type); \
- }
-
-/*
- * We avoid doing 64-bit copies on 32-bit architectures. They
- * might be better, but the component names are mostly small,
- * and the 64-bit cases can end up being much more complex and
- * put much more register pressure on the code, so it's likely
- * not worth the pain of unaligned accesses etc.
- *
- * So limit the copies to "unsigned long" size. I did verify
- * that at least the x86-32 case is ok without this limiting,
- * but I worry about random other legacy 32-bit cases that
- * might not do as well.
- */
-#define unsafe_copy_type(dst, src, len, type, label) do { \
- if (sizeof(type) <= sizeof(unsigned long)) \
- unsafe_copy_loop(dst, src, len, type, label); \
-} while (0)
-
-/*
- * Copy the dirent name to user space, and NUL-terminate
- * it. This should not be a function call, since we're doing
- * the copy inside a "user_access_begin/end()" section.
*/
#define unsafe_copy_dirent_name(_dst, _src, _len, label) do { \
char __user *dst = (_dst); \
const char *src = (_src); \
size_t len = (_len); \
- unsafe_copy_type(dst, src, len, u64, label); \
- unsafe_copy_type(dst, src, len, u32, label); \
- unsafe_copy_type(dst, src, len, u16, label); \
- unsafe_copy_type(dst, src, len, u8, label); \
- unsafe_put_user(0, dst, label); \
+ unsafe_put_user(0, dst+len, label); \
+ unsafe_copy_to_user(dst, src, len, label); \
} while (0)

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