Commit 94f45071 authored Oct 31, 2017 by Filipe Manana Committed by David Sterba Jan 22, 2018

Btrfs: use cached state when dirtying pages during buffered write

During a buffered IO write, we can have an extent state that we got when
we locked the range (if the range starts at an offset lower than eof), so
always pass it to btrfs_dirty_pages() so that setting the delalloc bit
in the range does not need to do a full search in the inode's io tree,
saving time and reducing the amount of time we hold the io tree's lock.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

parent f27451f2

fs/btrfs/file.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1755,7 +1755,7 @@ again:

		if (copied > 0)
		ret = btrfs_dirty_pages(inode, pages, dirty_pages,
		pos, copied, NULL);
		pos, copied, &cached_state);
		if (extents_locked)
		unlock_extent_cached(&BTRFS_I(inode)->io_tree,
		lockstart, lockend, &cached_state);

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