btrfs: add helper for fs_info->closing

wrap checking of filesystem 'closing' flag and fix a few missing memory
barriers.

Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 4 insertions, 6 deletions

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index bffa5c4a633b..ad144736a5fd 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -98,7 +98,7 @@ struct inode *lookup_free_space_inode(struct btrfs_root *root,
                 return inode;
 
         spin_lock(&block_group->lock);
-        if (!root->fs_info->closing) {
+        if (!btrfs_fs_closing(root->fs_info)) {
                 block_group->inode = igrab(inode);
                 block_group->iref = 1;
         }
@@ -493,8 +493,7 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
          * If we're unmounting then just return, since this does a search on the
          * normal root and not the commit root and we could deadlock.
          */
-        smp_mb();
-        if (fs_info->closing)
+        if (btrfs_fs_closing(fs_info))
                 return 0;
 
         /*
@@ -2513,7 +2512,7 @@ struct inode *lookup_free_ino_inode(struct btrfs_root *root,
                 return inode;
 
         spin_lock(&root->cache_lock);
-        if (!root->fs_info->closing)
+        if (!btrfs_fs_closing(root->fs_info))
                 root->cache_inode = igrab(inode);
         spin_unlock(&root->cache_lock);
 
@@ -2543,8 +2542,7 @@ int load_free_ino_cache(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
          * If we're unmounting then just return, since this does a search on the
          * normal root and not the commit root and we could deadlock.
          */
-        smp_mb();
-        if (fs_info->closing)
+        if (btrfs_fs_closing(fs_info))
                 return 0;
 
         path = btrfs_alloc_path();