Btrfs: use bitfield instead of integer data type for the some variants in btrfs_root
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index c30815e..7c4c049 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -241,18 +241,19 @@
static int record_root_in_trans(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
- if (root->ref_cows && root->last_trans < trans->transid) {
+ if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) &&
+ root->last_trans < trans->transid) {
WARN_ON(root == root->fs_info->extent_root);
WARN_ON(root->commit_root != root->node);
/*
- * see below for in_trans_setup usage rules
+ * see below for IN_TRANS_SETUP usage rules
* we have the reloc mutex held now, so there
* is only one writer in this function
*/
- root->in_trans_setup = 1;
+ set_bit(BTRFS_ROOT_IN_TRANS_SETUP, &root->state);
- /* make sure readers find in_trans_setup before
+ /* make sure readers find IN_TRANS_SETUP before
* they find our root->last_trans update
*/
smp_wmb();
@@ -279,7 +280,7 @@
* But, we have to set root->last_trans before we
* init the relocation root, otherwise, we trip over warnings
* in ctree.c. The solution used here is to flag ourselves
- * with root->in_trans_setup. When this is 1, we're still
+ * with root IN_TRANS_SETUP. When this is 1, we're still
* fixing up the reloc trees and everyone must wait.
*
* When this is zero, they can trust root->last_trans and fly
@@ -288,8 +289,8 @@
* done before we pop in the zero below
*/
btrfs_init_reloc_root(trans, root);
- smp_wmb();
- root->in_trans_setup = 0;
+ smp_mb__before_clear_bit();
+ clear_bit(BTRFS_ROOT_IN_TRANS_SETUP, &root->state);
}
return 0;
}
@@ -298,16 +299,16 @@
int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
- if (!root->ref_cows)
+ if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
return 0;
/*
- * see record_root_in_trans for comments about in_trans_setup usage
+ * see record_root_in_trans for comments about IN_TRANS_SETUP usage
* and barriers
*/
smp_rmb();
if (root->last_trans == trans->transid &&
- !root->in_trans_setup)
+ !test_bit(BTRFS_ROOT_IN_TRANS_SETUP, &root->state))
return 0;
mutex_lock(&root->fs_info->reloc_mutex);
@@ -365,7 +366,7 @@
static inline bool need_reserve_reloc_root(struct btrfs_root *root)
{
if (!root->fs_info->reloc_ctl ||
- !root->ref_cows ||
+ !test_bit(BTRFS_ROOT_REF_COWS, &root->state) ||
root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID ||
root->reloc_root)
return false;
@@ -1049,8 +1050,8 @@
btrfs_save_ino_cache(root, trans);
/* see comments in should_cow_block() */
- root->force_cow = 0;
- smp_wmb();
+ clear_bit(BTRFS_ROOT_FORCE_COW, &root->state);
+ smp_mb__after_clear_bit();
if (root->commit_root != root->node) {
list_add_tail(&root->dirty_list,
@@ -1081,7 +1082,7 @@
struct btrfs_trans_handle *trans;
int ret;
- if (xchg(&root->defrag_running, 1))
+ if (test_and_set_bit(BTRFS_ROOT_DEFRAG_RUNNING, &root->state))
return 0;
while (1) {
@@ -1104,7 +1105,7 @@
break;
}
}
- root->defrag_running = 0;
+ clear_bit(BTRFS_ROOT_DEFRAG_RUNNING, &root->state);
return ret;
}
@@ -1271,7 +1272,7 @@
}
/* see comments in should_cow_block() */
- root->force_cow = 1;
+ set_bit(BTRFS_ROOT_FORCE_COW, &root->state);
smp_wmb();
btrfs_set_root_node(new_root_item, tmp);