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() may sleep to allocate memory, it will
cause lockdep warning.
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@xxxxxxxxxxxxxx>
---
fs/btrfs/ctree.h | 2 ++
fs/btrfs/extent-tree.c | 28 ++++++++++++++++++----------
fs/btrfs/inode.c | 4 ++--
3 files changed, 22 insertions(+), 12 deletions(-)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index f20b901..3970426 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3455,6 +3455,8 @@ enum btrfs_reserve_flush_enum {
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 765f7e0..af221eb 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4070,10 +4070,12 @@ int btrfs_check_data_free_space(struct inode *inode, u64 start, u64 len)
* 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;
@@ -4083,13 +4085,6 @@ void btrfs_free_reserved_data_space(struct inode *inode, u64 start, u64 len)
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))
@@ -4101,6 +4096,19 @@ void btrfs_free_reserved_data_space(struct inode *inode, u64 start, u64 len)
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 85b06d1..bd3935c 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1773,8 +1773,8 @@ static void btrfs_clear_bit_hook(struct inode *inode,
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);
--
2.6.1
--
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