Commit 058e6d1d authored Jul 21, 2020 by Josef Bacik Committed by David Sterba Oct 07, 2020

btrfs: add flushing states for handling data reservations



Currently the way we do data reservations is by seeing if we have enough
space in our space_info.  If we do not and we're a normal inode we'll

1) Attempt to force a chunk allocation until we can't anymore.
2) If that fails we'll flush delalloc, then commit the transaction, then
   run the delayed iputs.

If we are a free space inode we're only allowed to force a chunk
allocation.  In order to use the normal flushing mechanism we need to
encode this into a flush state array for normal inodes.  Since both will
start with allocating chunks until the space info is full there is no
need to add this as a flush state, this will be handled specially.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Tested-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>

parent 448b966b

fs/btrfs/ctree.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -2592,6 +2592,8 @@ enum btrfs_reserve_flush_enum {
		*
		* Can be interruped by fatal signal.
		*/
		BTRFS_RESERVE_FLUSH_DATA,
		BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE,
		BTRFS_RESERVE_FLUSH_ALL,

		/*

fs/btrfs/space-info.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -1017,6 +1017,12 @@ static const enum btrfs_flush_state evict_flush_states[] = {
		COMMIT_TRANS,
		};

		static const enum btrfs_flush_state data_flush_states[] = {
		FLUSH_DELALLOC_WAIT,
		COMMIT_TRANS,
		RUN_DELAYED_IPUTS,
		};

		static void priority_reclaim_metadata_space(struct btrfs_fs_info *fs_info,
		struct btrfs_space_info *space_info,
		struct reserve_ticket *ticket,