btrfs: move fs_info::fs_frozen to the flags

We can keep the state among the other fs_info flags, there's no reason
why fs_frozen would need to be separate.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

4 files changed, 8 insertions, 7 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index f0f5f28784b6..6375e57a5a69 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -716,6 +716,8 @@ struct btrfs_delayed_root;
 #define BTRFS_FS_LOG1_ERR                       12
 #define BTRFS_FS_LOG2_ERR                       13
 #define BTRFS_FS_QUOTA_OVERRIDE                 14
+/* Used to record internally whether fs has been frozen */
+#define BTRFS_FS_FROZEN                         15
 
 /*
  * Indicate that a whole-filesystem exclusive operation is running
@@ -1107,9 +1109,6 @@ struct btrfs_fs_info {
          */
         struct list_head pinned_chunks;
 
-        /* Used to record internally whether fs has been frozen */
-        int fs_frozen;
-
         /* Cached block sizes */
         u32 nodesize;
         u32 sectorsize;
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 2b00ebff13f8..2ac0a35f4450 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2661,7 +2661,6 @@ int open_ctree(struct super_block *sb,
         atomic_set(&fs_info->qgroup_op_seq, 0);
         atomic_set(&fs_info->reada_works_cnt, 0);
         atomic64_set(&fs_info->tree_mod_seq, 0);
-        fs_info->fs_frozen = 0;
         fs_info->sb = sb;
         fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE;
         fs_info->metadata_ratio = 0;
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 53d43cd3cace..2100be6ae68e 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -2242,7 +2242,7 @@ static int btrfs_freeze(struct super_block *sb)
         struct btrfs_fs_info *fs_info = btrfs_sb(sb);
         struct btrfs_root *root = fs_info->tree_root;
 
-        fs_info->fs_frozen = 1;
+        set_bit(BTRFS_FS_FROZEN, &fs_info->flags);
         /*
          * We don't need a barrier here, we'll wait for any transaction that
          * could be in progress on other threads (and do delayed iputs that
@@ -2261,7 +2261,9 @@ static int btrfs_freeze(struct super_block *sb)
 
 static int btrfs_unfreeze(struct super_block *sb)
 {
-        btrfs_sb(sb)->fs_frozen = 0;
+        struct btrfs_fs_info *fs_info = btrfs_sb(sb);
+
+        clear_bit(BTRFS_FS_FROZEN, &fs_info->flags);
         return 0;
 }
 
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index ab030fb22530..97e33513b195 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -2314,7 +2314,8 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans)
          * it'll result in deadlock about SB_FREEZE_FS.
          */
         if (current != fs_info->transaction_kthread &&
-            current != fs_info->cleaner_kthread && !fs_info->fs_frozen)
+            current != fs_info->cleaner_kthread &&
+            !test_bit(BTRFS_FS_FROZEN, &fs_info->flags))
                 btrfs_run_delayed_iputs(fs_info);
 
         return ret;