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| author | Josef Bacik <josef@redhat.com> | 2011-08-01 12:08:18 -0400 |
|---|---|---|
| committer | Josef Bacik <josef@redhat.com> | 2011-10-19 15:12:30 -0400 |
| commit | 9e4871070b5f070cacf26525389d56e0345ba156 (patch) | |
| tree | cc52193e1d2d12923cdfe2749c3f74102bb9751e /fs/btrfs | |
| parent | fb25e9141ab843794d5cdef3936ccb58435e2371 (diff) | |
| download | linux-stable-9e4871070b5f070cacf26525389d56e0345ba156.tar.gz linux-stable-9e4871070b5f070cacf26525389d56e0345ba156.tar.bz2 linux-stable-9e4871070b5f070cacf26525389d56e0345ba156.zip | |
Btrfs: skip looking for delalloc if we don't have ->fill_delalloc
We always look for delalloc bytes in our io_tree so we can fill in delalloc.
This is fine in most cases, but if we're writing out the btree_inode this is
just a superfluous tree search on the io_tree, and if we have a lot of metadata
dirty this could be an expensive check. So instead check to see if our io_tree
has a ->fill_delalloc op, and if not don't even bother doing the lookup.
Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/extent_io.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index d418164a35f1..7d5e55632809 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2136,6 +2136,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc, int compressed; int write_flags; unsigned long nr_written = 0; + bool fill_delalloc = true; if (wbc->sync_mode == WB_SYNC_ALL) write_flags = WRITE_SYNC; @@ -2166,10 +2167,13 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc, set_page_extent_mapped(page); + if (!tree->ops || !tree->ops->fill_delalloc) + fill_delalloc = false; + delalloc_start = start; delalloc_end = 0; page_started = 0; - if (!epd->extent_locked) { + if (!epd->extent_locked && fill_delalloc) { u64 delalloc_to_write = 0; /* * make sure the wbc mapping index is at least updated |