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");
+ break;
case Opt_barrier:
btrfs_clear_and_info(info, NOBARRIER,
"turning on barriers");
--
2.14.1
--
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