From 633c0aad4c0243a506a3e8590551085ad78af82d Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Fri, 31 Oct 2014 09:49:34 -0400 Subject: [PATCH] Btrfs: move read only block groups onto their own list V2 Our gluster boxes were spending lots of time in statfs because our fs'es are huge. The problem is statfs loops through all of the block groups looking for read only block groups, and when you have several terabytes worth of data that ends up being a lot of block groups. Move the read only block groups onto a read only list and only proces that list in btrfs_account_ro_block_groups_free_space to reduce the amount of churn. Thanks, Signed-off-by: Josef Bacik Reviewed-by: Liu Bo Signed-off-by: Chris Mason --- fs/btrfs/ctree.h | 4 ++++ fs/btrfs/extent-tree.c | 36 +++++++++++++----------------------- 2 files changed, 17 insertions(+), 23 deletions(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index b72b35867a7f..fa14081e3383 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1170,6 +1170,7 @@ struct btrfs_space_info { struct percpu_counter total_bytes_pinned; struct list_head list; + struct list_head ro_bgs; struct rw_semaphore groups_sem; /* for block groups in our same type */ @@ -1305,6 +1306,9 @@ struct btrfs_block_group_cache { /* For delayed block group creation or deletion of empty block groups */ struct list_head bg_list; + + /* For read-only block groups */ + struct list_head ro_list; }; /* delayed seq elem */ diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 47c1ba141082..cf3460e9b122 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3504,6 +3504,7 @@ static int update_space_info(struct btrfs_fs_info *info, u64 flags, found->chunk_alloc = 0; found->flush = 0; init_waitqueue_head(&found->wait); + INIT_LIST_HEAD(&found->ro_bgs); ret = kobject_init_and_add(&found->kobj, &space_info_ktype, info->space_info_kobj, "%s", @@ -8511,6 +8512,7 @@ static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force) min_allocable_bytes <= sinfo->total_bytes) { sinfo->bytes_readonly += num_bytes; cache->ro = 1; + list_add_tail(&cache->ro_list, &sinfo->ro_bgs); ret = 0; } out: @@ -8565,15 +8567,20 @@ int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, /* * helper to account the unused space of all the readonly block group in the - * list. takes mirrors into account. + * space_info. takes mirrors into account. */ -static u64 __btrfs_get_ro_block_group_free_space(struct list_head *groups_list) +u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) { struct btrfs_block_group_cache *block_group; u64 free_bytes = 0; int factor; - list_for_each_entry(block_group, groups_list, list) { + /* It's df, we don't care if it's racey */ + if (list_empty(&sinfo->ro_bgs)) + return 0; + + spin_lock(&sinfo->lock); + list_for_each_entry(block_group, &sinfo->ro_bgs, ro_list) { spin_lock(&block_group->lock); if (!block_group->ro) { @@ -8594,26 +8601,6 @@ static u64 __btrfs_get_ro_block_group_free_space(struct list_head *groups_list) spin_unlock(&block_group->lock); } - - return free_bytes; -} - -/* - * helper to account the unused space of all the readonly block group in the - * space_info. takes mirrors into account. - */ -u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo) -{ - int i; - u64 free_bytes = 0; - - spin_lock(&sinfo->lock); - - for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) - if (!list_empty(&sinfo->block_groups[i])) - free_bytes += __btrfs_get_ro_block_group_free_space( - &sinfo->block_groups[i]); - spin_unlock(&sinfo->lock); return free_bytes; @@ -8633,6 +8620,7 @@ void btrfs_set_block_group_rw(struct btrfs_root *root, cache->bytes_super - btrfs_block_group_used(&cache->item); sinfo->bytes_readonly -= num_bytes; cache->ro = 0; + list_del_init(&cache->ro_list); spin_unlock(&cache->lock); spin_unlock(&sinfo->lock); } @@ -9002,6 +8990,7 @@ btrfs_create_block_group_cache(struct btrfs_root *root, u64 start, u64 size) INIT_LIST_HEAD(&cache->list); INIT_LIST_HEAD(&cache->cluster_list); INIT_LIST_HEAD(&cache->bg_list); + INIT_LIST_HEAD(&cache->ro_list); btrfs_init_free_space_ctl(cache); return cache; @@ -9411,6 +9400,7 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans, * are still on the list after taking the semaphore */ list_del_init(&block_group->list); + list_del_init(&block_group->ro_list); if (list_empty(&block_group->space_info->block_groups[index])) { kobj = block_group->space_info->block_group_kobjs[index]; block_group->space_info->block_group_kobjs[index] = NULL; -- 2.20.1