aboutsummaryrefslogtreecommitdiffstats
path: root/fs/btrfs/super.c
diff options
context:
space:
mode:
authorChristoph Hellwig <hch@lst.de>2009-10-14 09:24:59 -0400
committerChris Mason <chris.mason@oracle.com>2009-10-14 10:32:49 -0400
commite244a0aeb6a599c19a7c802cda6e2d67c847b154 (patch)
tree392d8d48c4e6676a552230135ad448d522007ece /fs/btrfs/super.c
parent86df7eb921a009515285e7171363fa57dd2d7d31 (diff)
downloadkernel_samsung_smdk4412-e244a0aeb6a599c19a7c802cda6e2d67c847b154.zip
kernel_samsung_smdk4412-e244a0aeb6a599c19a7c802cda6e2d67c847b154.tar.gz
kernel_samsung_smdk4412-e244a0aeb6a599c19a7c802cda6e2d67c847b154.tar.bz2
Btrfs: add -o discard option
Enable discard by default is not a good idea given the the trim speed of SSD prototypes we've seen, and the carecteristics for many high-end arrays. Turn of discards by default and require the -o discard option to enable them on. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/super.c')
-rw-r--r--fs/btrfs/super.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 3fbbf07..939b68f 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -66,7 +66,8 @@ enum {
Opt_degraded, Opt_subvol, Opt_device, Opt_nodatasum, Opt_nodatacow,
Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier,
Opt_ssd, Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl,
- Opt_compress, Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_err,
+ Opt_compress, Opt_notreelog, Opt_ratio, Opt_flushoncommit,
+ Opt_discard, Opt_err,
};
static match_table_t tokens = {
@@ -88,6 +89,7 @@ static match_table_t tokens = {
{Opt_notreelog, "notreelog"},
{Opt_flushoncommit, "flushoncommit"},
{Opt_ratio, "metadata_ratio=%d"},
+ {Opt_discard, "discard"},
{Opt_err, NULL},
};
@@ -257,6 +259,9 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
info->metadata_ratio);
}
break;
+ case Opt_discard:
+ btrfs_set_opt(info->mount_opt, DISCARD);
+ break;
default:
break;
}