From 55eeaf0578038c40baaf3cf9408c23e42cd2a2b8 Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Tue, 8 Sep 2015 17:08:38 +0800 Subject: btrfs: qgroup: Introduce new functions to reserve/free metadata Introduce new functions btrfs_qgroup_reserve/free_meta() to reserve/free metadata reserved space. Signed-off-by: Qu Wenruo Signed-off-by: Chris Mason --- fs/btrfs/qgroup.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) (limited to 'fs/btrfs/qgroup.c') diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index 75d8e584c3e5..897a49d71638 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -2594,3 +2594,43 @@ int btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len) { return __btrfs_qgroup_release_data(inode, start, len, 0); } + +int btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes) +{ + int ret; + + if (!root->fs_info->quota_enabled || !is_fstree(root->objectid) || + num_bytes == 0) + return 0; + + BUG_ON(num_bytes != round_down(num_bytes, root->nodesize)); + ret = btrfs_qgroup_reserve(root, num_bytes); + if (ret < 0) + return ret; + atomic_add(num_bytes, &root->qgroup_meta_rsv); + return ret; +} + +void btrfs_qgroup_free_meta_all(struct btrfs_root *root) +{ + int reserved; + + if (!root->fs_info->quota_enabled || !is_fstree(root->objectid)) + return; + + reserved = atomic_xchg(&root->qgroup_meta_rsv, 0); + if (reserved == 0) + return; + btrfs_qgroup_free(root, reserved); +} + +void btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes) +{ + if (!root->fs_info->quota_enabled || !is_fstree(root->objectid)) + return; + + BUG_ON(num_bytes != round_down(num_bytes, root->nodesize)); + WARN_ON(atomic_read(&root->qgroup_meta_rsv) < num_bytes); + atomic_sub(num_bytes, &root->qgroup_meta_rsv); + btrfs_qgroup_free(root, num_bytes); +} -- cgit v1.2.3