On Thu, Mar 08, 2018 at 10:48:48AM -0800, Howard McLauchlan wrote:
> Btrfs has two mount options for SSD optimizations: ssd and ssd_spread.
> Presently there is an option to disable all SSD optimizations, but there
> isn't an option to disable just ssd_spread.
>
> This patch adds a mount option nossd_spread that disables ssd_spread
> only.
>
> Reviewed-by: Josef Bacik <jbacik@xxxxxx>
Reviewed-by: Omar Sandoval <osandov@xxxxxx>
> Signed-off-by: Howard McLauchlan <hmclauchlan@xxxxxx>
> ---
> V2:remove duplicate code with fallthrough
> Based on 4.16-rc4
>
> fs/btrfs/super.c | 11 +++++++----
> 1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
> index 4b817947e00f..5bfcbf6f7eea 100644
> --- a/fs/btrfs/super.c
> +++ b/fs/btrfs/super.c
> @@ -310,10 +310,10 @@ static void btrfs_put_super(struct super_block *sb)
> enum {
> Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum,
> Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd,
> - Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress,
> - Opt_compress_type, Opt_compress_force, Opt_compress_force_type,
> - Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard,
> - Opt_space_cache, Opt_space_cache_version, Opt_clear_cache,
> + Opt_nossd, Opt_ssd_spread, Opt_nossd_spread, Opt_thread_pool, Opt_noacl,
> + Opt_compress, Opt_compress_type, Opt_compress_force,
> + Opt_compress_force_type, Opt_notreelog, Opt_ratio, Opt_flushoncommit,
> + Opt_discard, Opt_space_cache, Opt_space_cache_version, Opt_clear_cache,
> Opt_user_subvol_rm_allowed, Opt_enospc_debug, Opt_subvolrootid,
> Opt_defrag, Opt_inode_cache, Opt_no_space_cache, Opt_recovery,
> Opt_skip_balance, Opt_check_integrity,
> @@ -353,6 +353,7 @@ static const match_table_t tokens = {
> {Opt_ssd, "ssd"},
> {Opt_ssd_spread, "ssd_spread"},
> {Opt_nossd, "nossd"},
> + {Opt_nossd_spread, "nossd_spread"},
> {Opt_acl, "acl"},
> {Opt_noacl, "noacl"},
> {Opt_notreelog, "notreelog"},
> @@ -579,6 +580,8 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
> btrfs_set_opt(info->mount_opt, NOSSD);
> btrfs_clear_and_info(info, SSD,
> "not using ssd optimizations");
> + /* Fallthrough */
> + case Opt_nossd_spread:
> btrfs_clear_and_info(info, SSD_SPREAD,
> "not using spread ssd allocation scheme");
> break;
> --
> 2.14.1
>
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