xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

btrfs: add optimized version of eb to eb copy

Browse Source 
Using copy_extent_buffer is suitable for copying betwenn buffers from an
arbitrary offset and deals with page boundaries. This is not necessary
when doing a full extent_buffer-to-extent_buffer copy. We can utilize
the copy_page helper as well.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba
2016-11-08 18:30:31 +01:00
parent b159fa2808
commit 58e8012cc1
3 changed files with 18 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
fs/btrfs/extent_io.c
View File

@@ -5546,6 +5546,20 @@ void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
}
}
void copy_extent_buffer_full(struct extent_buffer *dst,
struct extent_buffer *src)
{
int i;
unsigned num_pages;
ASSERT(dst->len == src->len);
num_pages = num_extent_pages(dst->start, dst->len);
for (i = 0; i < num_pages; i++)
copy_page(page_address(dst->pages[i]),
page_address(src->pages[i]));
}
void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
unsigned long dst_offset, unsigned long src_offset,
unsigned long len)