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Btrfs: skip looking for delalloc if we don't have ->fill_delalloc

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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>
This commit is contained in:
Josef Bacik 2011-08-01 12:08:18 -04:00
parent fb25e9141a
commit 9e4871070b
1 changed files with 5 additions and 1 deletions
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6
fs/btrfs/extent_io.c
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@ -2136,6 +2136,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
int compressed; int compressed;
int write_flags; int write_flags;
unsigned long nr_written = 0; unsigned long nr_written = 0;
bool fill_delalloc = true;
if (wbc->sync_mode == WB_SYNC_ALL) if (wbc->sync_mode == WB_SYNC_ALL)
write_flags = WRITE_SYNC; write_flags = WRITE_SYNC;
@ -2166,10 +2167,13 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
set_page_extent_mapped(page); set_page_extent_mapped(page);
if (!tree->ops || !tree->ops->fill_delalloc)
fill_delalloc = false;
delalloc_start = start; delalloc_start = start;
delalloc_end = 0; delalloc_end = 0;
page_started = 0; page_started = 0;
if (!epd->extent_locked) { if (!epd->extent_locked && fill_delalloc) {
u64 delalloc_to_write = 0; u64 delalloc_to_write = 0;
/* /*
* make sure the wbc mapping index is at least updated * make sure the wbc mapping index is at least updated