Commit aed0ca18 authored by Filipe Manana's avatar Filipe Manana Committed by David Sterba
Browse files

btrfs: allow hole and data seeking to be interruptible 

Doing hole or data seeking on a file with a very large number of extents
can take a long time, and we have reports of it being too slow (such as
at LSFMM from 2017, see the Link below). So make it interruptible.

Link: https://lwn.net/Articles/718805/


Reviewed-by: default avatarJosef Bacik <josef@toxicpanda.com>
Reviewed-by: default avatarQu Wenruo <wqu@suse.com>
Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent bd64f622

fs/btrfs/file.c

+4 −0
Original line number Diff line number Diff line
@@ -3652,6 +3652,10 @@ static loff_t find_desired_extent(struct btrfs_inode *inode, loff_t offset, 
		start = em->start + em->len;

		free_extent_map(em);

		em = NULL;

		if (fatal_signal_pending(current)) {

			ret = -EINTR;

			break;

		}

		cond_resched();

	}

	free_extent_map(em);