void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \
unsigned long off, u##bits val) \
{ \
- unsigned long part_offset = (unsigned long)ptr; \
- unsigned long offset = part_offset + off; \
- void *p; \
- int err; \
- char *kaddr; \
- unsigned long map_start; \
- unsigned long map_len; \
- int size = sizeof(u##bits); \
+ const unsigned long member_offset = (unsigned long)ptr + off; \
+ const unsigned long oip = offset_in_page(member_offset); \
+ const int size = sizeof(u##bits); \
+ __le##bits leres; \
\
ASSERT(check_setget_bounds(eb, ptr, off, size)); \
- err = map_private_extent_buffer(eb, offset, size, \
- &kaddr, &map_start, &map_len); \
- if (err) { \
- __le##bits val2; \
- \
- val2 = cpu_to_le##bits(val); \
- write_extent_buffer(eb, &val2, offset, size); \
+ if (oip + size <= PAGE_SIZE) { \
+ const unsigned long idx = member_offset >> PAGE_SHIFT; \
+ char *kaddr = page_address(eb->pages[idx]); \
+ put_unaligned_le##bits(val, kaddr + oip); \
return; \
} \
- p = kaddr + part_offset - map_start; \
- put_unaligned_le##bits(val, p + off); \
+ leres = cpu_to_le##bits(val); \
+ write_extent_buffer(eb, &leres, member_offset, size); \
}
DEFINE_BTRFS_SETGET_BITS(8)