Btrfs: Add mount -o ssd, which includes optimizations for seek free storage

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index e506de3168bc..b6982f0133cf 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -64,7 +64,7 @@ static void btrfs_put_super (struct super_block * sb)
 
 enum {
         Opt_subvol, Opt_nodatasum, Opt_nodatacow, Opt_max_extent,
-        Opt_alloc_start, Opt_nobarrier, Opt_err,
+        Opt_alloc_start, Opt_nobarrier, Opt_ssd, Opt_err,
 };
 
 static match_table_t tokens = {
@@ -74,6 +74,7 @@ static match_table_t tokens = {
         {Opt_nobarrier, "nobarrier"},
         {Opt_max_extent, "max_extent=%s"},
         {Opt_alloc_start, "alloc_start=%s"},
+        {Opt_ssd, "ssd"},
         {Opt_err, NULL}
 };
 
@@ -149,6 +150,12 @@ static int parse_options (char * options,
                                 btrfs_set_opt(info->mount_opt, NODATASUM);
                         }
                         break;
+                case Opt_ssd:
+                        if (info) {
+                                printk("btrfs: use ssd allocation scheme\n");
+                                btrfs_set_opt(info->mount_opt, SSD);
+                        }
+                        break;
                 case Opt_nobarrier:
                         if (info) {
                                 printk("btrfs: turning off barriers\n");