[PATCH] Btrfs: add a flags field to btrfs_transaction

[Josef Bacik <jbacik@fb.com>]

I want to set some per transaction flags, so instead of adding yet another int
lets just convert the current two int indicators to flags and add a flags field
for future use.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
---
 fs/btrfs/extent-tree.c |  5 +++--
 fs/btrfs/transaction.c | 18 ++++++++----------
 fs/btrfs/transaction.h |  9 ++++-----
 fs/btrfs/volumes.c     |  2 +-
 4 files changed, 16 insertions(+), 18 deletions(-)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index eca1840..78a1504 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4024,7 +4024,8 @@ commit_trans:
 			if (IS_ERR(trans))
 				return PTR_ERR(trans);
 			if (have_pinned_space >= 0 ||
-			    trans->transaction->have_free_bgs ||
+			    test_bit(BTRFS_TRANS_HAVE_FREE_BGS,
+				     &trans->transaction->flags) ||
 			    need_commit > 0) {
 				ret = btrfs_commit_transaction(trans, root);
 				if (ret)
@@ -9049,7 +9050,7 @@ again:
 	 * back off and let this transaction commit
 	 */
 	mutex_lock(&root->fs_info->ro_block_group_mutex);
-	if (trans->transaction->dirty_bg_run) {
+	if (test_bit(BTRFS_TRANS_DIRTY_BG_RUN, &trans->transaction->flags)) {
 		u64 transid = trans->transid;
 
 		mutex_unlock(&root->fs_info->ro_block_group_mutex);
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index df1e61e..debfc99 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -230,9 +230,8 @@ loop:
 	 * commit the transaction.
 	 */
 	atomic_set(&cur_trans->use_count, 2);
-	cur_trans->have_free_bgs = 0;
+	cur_trans->flags = 0;
 	cur_trans->start_time = get_seconds();
-	cur_trans->dirty_bg_run = 0;
 
 	cur_trans->delayed_refs.href_root = RB_ROOT;
 	cur_trans->delayed_refs.dirty_extent_root = RB_ROOT;
@@ -1846,7 +1845,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 		return ret;
 	}
 
-	if (!cur_trans->dirty_bg_run) {
+	if (!test_bit(BTRFS_TRANS_DIRTY_BG_RUN, &cur_trans->flags)) {
 		int run_it = 0;
 
 		/* this mutex is also taken before trying to set
@@ -1855,18 +1854,17 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 		 * after a extents from that block group have been
 		 * allocated for cache files.  btrfs_set_block_group_ro
 		 * will wait for the transaction to commit if it
-		 * finds dirty_bg_run = 1
+		 * finds BTRFS_TRANS_DIRTY_BG_RUN set.
 		 *
-		 * The dirty_bg_run flag is also used to make sure only
-		 * one process starts all the block group IO.  It wouldn't
+		 * The BTRFS_TRANS_DIRTY_BG_RUN flag is also used to make sure
+		 * only one process starts all the block group IO.  It wouldn't
 		 * hurt to have more than one go through, but there's no
 		 * real advantage to it either.
 		 */
 		mutex_lock(&root->fs_info->ro_block_group_mutex);
-		if (!cur_trans->dirty_bg_run) {
+		if (!test_and_set_bit(BTRFS_TRANS_DIRTY_BG_RUN,
+				      &cur_trans->flags))
 			run_it = 1;
-			cur_trans->dirty_bg_run = 1;
-		}
 		mutex_unlock(&root->fs_info->ro_block_group_mutex);
 
 		if (run_it)
@@ -2134,7 +2132,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 
 	btrfs_finish_extent_commit(trans, root);
 
-	if (cur_trans->have_free_bgs)
+	if (test_bit(BTRFS_TRANS_HAVE_FREE_BGS, &cur_trans->flags))
 		btrfs_clear_space_info_full(root->fs_info);
 
 	root->fs_info->last_trans_committed = cur_trans->transid;
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h
index f158ab4..02c6ca1 100644
--- a/fs/btrfs/transaction.h
+++ b/fs/btrfs/transaction.h
@@ -32,6 +32,9 @@ enum btrfs_trans_state {
 	TRANS_STATE_MAX			= 6,
 };
 
+#define BTRFS_TRANS_HAVE_FREE_BGS	0
+#define BTRFS_TRANS_DIRTY_BG_RUN	1
+
 struct btrfs_transaction {
 	u64 transid;
 	/*
@@ -47,10 +50,7 @@ struct btrfs_transaction {
 	atomic_t num_writers;
 	atomic_t use_count;
 
-	/*
-	 * true if there is free bgs operations in this transaction
-	 */
-	int have_free_bgs;
+	unsigned long flags;
 
 	/* Be protected by fs_info->trans_lock when we want to change it. */
 	enum btrfs_trans_state state;
@@ -78,7 +78,6 @@ struct btrfs_transaction {
 	spinlock_t dropped_roots_lock;
 	struct btrfs_delayed_ref_root delayed_refs;
 	int aborted;
-	int dirty_bg_run;
 };
 
 #define __TRANS_FREEZABLE	(1U << 0)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index ff64689..3f5a781 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1399,7 +1399,7 @@ again:
 		btrfs_error(root->fs_info, ret,
 			    "Failed to remove dev extent item");
 	} else {
-		trans->transaction->have_free_bgs = 1;
+		set_bit(BTRFS_TRANS_DIRTY_BG_RUN, &trans->transaction->flags);
 	}
 out:
 	btrfs_free_path(path);
-- 
1.8.3.1