diff options
| author | Dennis Zhou <dennis@kernel.org> | 2020-01-02 16:26:37 -0500 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-01-20 16:40:59 +0100 |
| commit | 4aa9ad520398bf9cef70fc9c363567da44312045 (patch) | |
| tree | 77badf26527c9d58896c8d14f3f906109aff668d /fs/btrfs/discard.h | |
| parent | e93591bb6ecf3e31c8f5366eac143f4f9c270915 (diff) | |
btrfs: limit max discard size for async discard
Throttle the maximum size of a discard so that we can provide an upper
bound for the rate of async discard. While the block layer is able to
split discards into the appropriate sized discards, we want to be able
to account more accurately the rate at which we are consuming NCQ slots
as well as limit the upper bound of work for a discard.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/discard.h')
| -rw-r--r-- | fs/btrfs/discard.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/btrfs/discard.h b/fs/btrfs/discard.h index 5250fe178e49..562c60fab77a 100644 --- a/fs/btrfs/discard.h +++ b/fs/btrfs/discard.h @@ -3,10 +3,15 @@ #ifndef BTRFS_DISCARD_H #define BTRFS_DISCARD_H +#include <linux/sizes.h> + struct btrfs_fs_info; struct btrfs_discard_ctl; struct btrfs_block_group; +/* Discard size limits */ +#define BTRFS_ASYNC_DISCARD_MAX_SIZE (SZ_64M) + /* Work operations */ void btrfs_discard_cancel_work(struct btrfs_discard_ctl *discard_ctl, struct btrfs_block_group *block_group); |