diff options
| author | Zach Brown <zab@redhat.com> | 2013-10-16 12:10:33 -0700 |
|---|---|---|
| committer | Chris Mason <chris.mason@fusionio.com> | 2013-11-11 22:03:09 -0500 |
| commit | 1877e1a747db33d7264d8046e96373962da72a3d (patch) | |
| tree | b928d5a17bacd6644631d200e3a82232202b2aec /fs | |
| parent | 4546bcaeba435c1d0b7f38c011cbb2367497ca8d (diff) | |
| download | op-kernel-dev-1877e1a747db33d7264d8046e96373962da72a3d.zip op-kernel-dev-1877e1a747db33d7264d8046e96373962da72a3d.tar.gz | |
btrfs: remove move_pages()
move_pages() has an inefficient backwards byte copy of regions of two
different pages. They're different pages so the regions won't overlap
and it could use memcpy().
At that point, though, move_pages() would be a slightly dimmer
re-implementation of copy_pages() that lacked the test for overlapping
page regions.
So remove move_pages() and just call copy_pages().
Signed-off-by: Zach Brown <zab@redhat.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/extent_io.c | 19 |
1 files changed, 1 insertions, 18 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 5439f24..5bf98d2 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -5082,23 +5082,6 @@ void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, } } -static void move_pages(struct page *dst_page, struct page *src_page, - unsigned long dst_off, unsigned long src_off, - unsigned long len) -{ - char *dst_kaddr = page_address(dst_page); - if (dst_page == src_page) { - memmove(dst_kaddr + dst_off, dst_kaddr + src_off, len); - } else { - char *src_kaddr = page_address(src_page); - char *p = dst_kaddr + dst_off + len; - char *s = src_kaddr + src_off + len; - - while (len--) - *--p = *--s; - } -} - static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len) { unsigned long distance = (src > dst) ? src - dst : dst - src; @@ -5209,7 +5192,7 @@ void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, cur = min_t(unsigned long, len, src_off_in_page + 1); cur = min(cur, dst_off_in_page + 1); - move_pages(extent_buffer_page(dst, dst_i), + copy_pages(extent_buffer_page(dst, dst_i), extent_buffer_page(dst, src_i), dst_off_in_page - cur + 1, src_off_in_page - cur + 1, cur); |
