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authorQu Wenruo <quwenruo@cn.fujitsu.com>2015-09-08 17:08:38 +0800
committerChris Mason <clm@fb.com>2015-10-21 18:37:47 -0700
commit55eeaf0578038c40baaf3cf9408c23e42cd2a2b8 (patch)
tree3539d0575ebba0c079cc293b9cf884a402688d1b /fs/btrfs/qgroup.c
parent297d750b9f8d7e6f2dbdf8abc5aa3b5c656affdc (diff)
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 <quwenruo@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs/qgroup.c')
-rw-r--r--fs/btrfs/qgroup.c40
1 files changed, 40 insertions, 0 deletions
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);
+}