From e1211d0e896b71d395fe411d0e0a76f4bc336617 Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Tue, 12 Dec 2017 15:34:30 +0800 Subject: [PATCH] btrfs: qgroup: Don't use root->qgroup_meta_rsv for qgroup Since qgroup has seperate metadata reservation types now, we can completely get rid of the old root->qgroup_meta_rsv, which mostly acts as current META_PERTRANS reservation type. Signed-off-by: Qu Wenruo Signed-off-by: David Sterba --- fs/btrfs/ctree.h | 3 --- fs/btrfs/disk-io.c | 1 - fs/btrfs/qgroup.c | 33 ++++++++++++++++++++++++--------- 3 files changed, 24 insertions(+), 13 deletions(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index f9f512be9d41..df0463e2ab7f 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1264,9 +1264,6 @@ struct btrfs_root { int send_in_progress; struct btrfs_subvolume_writers *subv_writers; atomic_t will_be_snapshotted; - - /* For qgroup metadata space reserve */ - atomic64_t qgroup_meta_rsv; }; struct btrfs_file_private { diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 38b387ae78f8..ad900f821f1e 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1163,7 +1163,6 @@ static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info, atomic_set(&root->orphan_inodes, 0); refcount_set(&root->refs, 1); atomic_set(&root->will_be_snapshotted, 0); - atomic64_set(&root->qgroup_meta_rsv, 0); root->log_transid = 0; root->log_transid_committed = -1; root->last_log_commit = 0; diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index 8831eaa14204..a7ca464cdbf7 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -2499,6 +2499,15 @@ out: return ret; } +/* + * Free @num_bytes of reserved space with @type for qgroup. (Normally level 0 + * qgroup). + * + * Will handle all higher level qgroup too. + * + * NOTE: If @num_bytes is (u64)-1, this means to free all bytes of this qgroup. + * This special case is only used for META_PERTRANS type. + */ void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info, u64 ref_root, u64 num_bytes, enum btrfs_qgroup_rsv_type type) @@ -2515,6 +2524,10 @@ void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info, if (num_bytes == 0) return; + if (num_bytes == (u64)-1 && type != BTRFS_QGROUP_RSV_META_PERTRANS) { + WARN(1, "%s: Invalid type to free", __func__); + return; + } spin_lock(&fs_info->qgroup_lock); quota_root = fs_info->quota_root; @@ -2525,6 +2538,13 @@ void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info, if (!qgroup) goto out; + /* + * We're freeing all pertrans rsv, get current value from level 0 + * qgroup as real num_bytes to free. + */ + if (num_bytes == (u64)-1) + num_bytes = qgroup->rsv.values[type]; + ulist_reinit(fs_info->qgroup_ulist); ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid, (uintptr_t)qgroup, GFP_ATOMIC); @@ -3082,24 +3102,21 @@ int __btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes, ret = qgroup_reserve(root, num_bytes, enforce, type); if (ret < 0) return ret; - atomic64_add(num_bytes, &root->qgroup_meta_rsv); return ret; } void btrfs_qgroup_free_meta_all_pertrans(struct btrfs_root *root) { struct btrfs_fs_info *fs_info = root->fs_info; - u64 reserved; if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) || !is_fstree(root->objectid)) return; - reserved = atomic64_xchg(&root->qgroup_meta_rsv, 0); - if (reserved == 0) - return; - trace_qgroup_meta_reserve(root, -(s64)reserved); - btrfs_qgroup_free_refroot(fs_info, root->objectid, reserved, + /* TODO: Update trace point to handle such free */ + trace_qgroup_meta_reserve(root, 0); + /* Special value -1 means to free all reserved space */ + btrfs_qgroup_free_refroot(fs_info, root->objectid, (u64)-1, BTRFS_QGROUP_RSV_META_PERTRANS); } @@ -3113,8 +3130,6 @@ void __btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes, return; BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize)); - WARN_ON(atomic64_read(&root->qgroup_meta_rsv) < num_bytes); - atomic64_sub(num_bytes, &root->qgroup_meta_rsv); trace_qgroup_meta_reserve(root, -(s64)num_bytes); btrfs_qgroup_free_refroot(fs_info, root->objectid, num_bytes, type); } -- 2.30.2