Btrfs: Fix sparse endian warnings in struct-funcs.c
The btrfs macros to access individual struct members on disk were
sending the same variable to functions that expected different types
of endianness. This fix explicitly creates a variable of the correct
type instead of abusing a single variable for mixed purposes.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/struct-funcs.c b/fs/btrfs/struct-funcs.c
index cdedbe1..8d7f568 100644
--- a/fs/btrfs/struct-funcs.c
+++ b/fs/btrfs/struct-funcs.c
@@ -36,9 +36,14 @@
* The extent buffer api is used to do all the kmapping and page
* spanning work required to get extent buffers in highmem and have
* a metadata blocksize different from the page size.
+ *
+ * The macro starts with a simple function prototype declaration so that
+ * sparse won't complain about it being static.
*/
#define BTRFS_SETGET_FUNCS(name, type, member, bits) \
+u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
+void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val); \
u##bits btrfs_##name(struct extent_buffer *eb, \
type *s) \
{ \
@@ -59,14 +64,15 @@
int unmap_on_exit = (eb->map_token == NULL); \
unsigned long map_start; \
unsigned long map_len; \
- __le##bits res; \
+ u##bits res; \
err = map_extent_buffer(eb, offset, \
sizeof(((type *)0)->member), \
&map_token, &kaddr, \
&map_start, &map_len, KM_USER1); \
if (err) { \
- read_eb_member(eb, s, type, member, &res); \
- return le##bits##_to_cpu(res); \
+ __le##bits leres; \
+ read_eb_member(eb, s, type, member, &leres); \
+ return le##bits##_to_cpu(leres); \
} \
p = (type *)(kaddr + part_offset - map_start); \
res = le##bits##_to_cpu(p->member); \
@@ -101,8 +107,9 @@
&map_token, &kaddr, \
&map_start, &map_len, KM_USER1); \
if (err) { \
- val = cpu_to_le##bits(val); \
- write_eb_member(eb, s, type, member, &val); \
+ __le##bits val2; \
+ val2 = cpu_to_le##bits(val); \
+ write_eb_member(eb, s, type, member, &val2); \
return; \
} \
p = (type *)(kaddr + part_offset - map_start); \