On Wed, Feb 21, 2018 at 03:31:40PM -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.
>
> Signed-off-by: Howard McLauchlan <hmclauch...@fb.com>
> ---
> fs/btrfs/super.c | 13 +++++++++----
> 1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
> index 6e71a2a78363..4c0fcf5b3e7e 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"},
> @@ -582,6 +583,10 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char
> *options,
> btrfs_clear_and_info(info, SSD_SPREAD,
> "not using spread ssd allocation
> scheme");
> break;
> + case Opt_nossd_spread:
> + btrfs_clear_and_info(info, SSD_SPREAD,
> + "not using spread ssd allocation
> scheme");
The message is the same as above adn the 2 cases can be merged.
> + break;
> case Opt_barrier:
> btrfs_clear_and_info(info, NOBARRIER,
> "turning on barriers");
> --
> 2.14.1
>
> --
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