btrfs: qgroup: Avoid calling btrfs_free_reserved_data_space in clear_bit_hook
In clear_bit_hook, qgroup reserved data is already handled quite well,
either released by finish_ordered_io or invalidatepage.
So calling btrfs_qgroup_free_data() here is completely meaningless, and
since btrfs_qgroup_free_data() will lock io_tree, so it can't be called
with io_tree lock hold.
This patch will add a new function
btrfs_free_reserved_data_space_noquota() for clear_bit_hook() to cease
the lockdep warning.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 0d0f5d2..2135b82 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3455,6 +3455,8 @@
int btrfs_check_data_free_space(struct inode *inode, u64 start, u64 len);
int btrfs_alloc_data_chunk_ondemand(struct inode *inode, u64 bytes);
void btrfs_free_reserved_data_space(struct inode *inode, u64 start, u64 len);
+void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start,
+ u64 len);
void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index aaaa774..4660960 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4066,10 +4066,12 @@
* Called if we need to clear a data reservation for this inode
* Normally in a error case.
*
- * This one will handle the per-indoe data rsv map for accurate reserved
- * space framework.
+ * This one will *NOT* use accurate qgroup reserved space API, just for case
+ * which we can't sleep and is sure it won't affect qgroup reserved space.
+ * Like clear_bit_hook().
*/
-void btrfs_free_reserved_data_space(struct inode *inode, u64 start, u64 len)
+void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start,
+ u64 len)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_space_info *data_sinfo;
@@ -4079,13 +4081,6 @@
round_down(start, root->sectorsize);
start = round_down(start, root->sectorsize);
- /*
- * Free any reserved qgroup data space first
- * As it will alloc memory, we can't do it with data sinfo
- * spinlock hold.
- */
- btrfs_qgroup_free_data(inode, start, len);
-
data_sinfo = root->fs_info->data_sinfo;
spin_lock(&data_sinfo->lock);
if (WARN_ON(data_sinfo->bytes_may_use < len))
@@ -4097,6 +4092,19 @@
spin_unlock(&data_sinfo->lock);
}
+/*
+ * Called if we need to clear a data reservation for this inode
+ * Normally in a error case.
+ *
+ * This one will handle the per-indoe data rsv map for accurate reserved
+ * space framework.
+ */
+void btrfs_free_reserved_data_space(struct inode *inode, u64 start, u64 len)
+{
+ btrfs_free_reserved_data_space_noquota(inode, start, len);
+ btrfs_qgroup_free_data(inode, start, len);
+}
+
static void force_metadata_allocation(struct btrfs_fs_info *info)
{
struct list_head *head = &info->space_info;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 6670792..3229c13 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1776,8 +1776,8 @@
if (root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID
&& do_list && !(state->state & EXTENT_NORESERVE))
- btrfs_free_reserved_data_space(inode, state->start,
- len);
+ btrfs_free_reserved_data_space_noquota(inode,
+ state->start, len);
__percpu_counter_add(&root->fs_info->delalloc_bytes, -len,
root->fs_info->delalloc_batch);