Commit 9e487107 authored by Josef Bacik's avatar Josef Bacik

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: default avatarJosef Bacik <josef@redhat.com>
parent fb25e914
......@@ -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
......
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