From 95995dbbe691c78cf78948e48b9778531bf1fb3c Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.com>
Date: Fri, 6 Jan 2017 13:27:00 +0100
Subject: [PATCH] btrfs: remove unused logic of limiting async delalloc pages
A proposed patch in https://marc.info/?l=linux-btrfs&m=147859791003837
pointed out bad limit threshold in cow_file_range_async, but it turned
out that the whole logic is not necessary and is done by writeback. We
agreed to remove it.
Signed-off-by: David Sterba <dsterba@suse.com>
---
fs/btrfs/inode.c | 7 -------
1 file changed, 7 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index c0e982c36ec5..39bb0bb0f6e9 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1167,7 +1167,6 @@ static int cow_file_range_async(struct inode *inode, struct page *locked_page,
struct btrfs_root *root = BTRFS_I(inode)->root;
unsigned long nr_pages;
u64 cur_end;
- int limit = 10 * SZ_1M;
clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED,
1, 0, NULL, GFP_NOFS);
@@ -1199,12 +1198,6 @@ static int cow_file_range_async(struct inode *inode, struct page *locked_page,
btrfs_queue_work(fs_info->delalloc_workers, &async_cow->work);
- if (atomic_read(&fs_info->async_delalloc_pages) > limit) {
- wait_event(fs_info->async_submit_wait,
- (atomic_read(&fs_info->async_delalloc_pages) <
- limit));
- }
-
while (atomic_read(&fs_info->async_submit_draining) &&
atomic_read(&fs_info->async_delalloc_pages)) {
wait_event(fs_info->async_submit_wait,