From 4cb5300bc839b8a943eb19c9f27f25470e22d0ca Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Tue, 24 May 2011 15:35:30 -0400 Subject: Btrfs: add mount -o auto_defrag This will detect small random writes into files and queue the up for an auto defrag process. It isn't well suited to database workloads yet, but works for smaller files such as rpm, sqlite or bdb databases. Signed-off-by: Chris Mason --- fs/btrfs/super.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'fs/btrfs/super.c') diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index cd0c7cd2c8fb..28e3cb2607ff 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -160,7 +160,7 @@ enum { Opt_compress_type, Opt_compress_force, Opt_compress_force_type, Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, - Opt_enospc_debug, Opt_subvolrootid, Opt_err, + Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_err, }; static match_table_t tokens = { @@ -191,6 +191,7 @@ static match_table_t tokens = { {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, {Opt_enospc_debug, "enospc_debug"}, {Opt_subvolrootid, "subvolrootid=%d"}, + {Opt_defrag, "autodefrag"}, {Opt_err, NULL}, }; @@ -369,6 +370,10 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) case Opt_enospc_debug: btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); break; + case Opt_defrag: + printk(KERN_INFO "btrfs: enabling auto defrag"); + btrfs_set_opt(info->mount_opt, AUTO_DEFRAG); + break; case Opt_err: printk(KERN_INFO "btrfs: unrecognized mount option " "'%s'\n", p); -- cgit v1.2.3