Merge branch 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason...

[linux-2.6-microblaze.git] / fs / btrfs / super.c

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 6bad633..2b07b35 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -69,7 +69,7 @@ static struct file_system_type btrfs_fs_type;
 
 static int btrfs_remount(struct super_block *sb, int *flags, char *data);
 
-static const char *btrfs_decode_error(int errno)
+const char *btrfs_decode_error(int errno)
 {
        char *errstr = "unknown";
 
@@ -1033,6 +1033,7 @@ static int btrfs_fill_super(struct super_block *sb,
        sb->s_flags |= MS_POSIXACL;
 #endif
        sb->s_flags |= MS_I_VERSION;
+       sb->s_iflags |= SB_I_CGROUPWB;
        err = open_ctree(sb, fs_devices, (char *)data);
        if (err) {
                printk(KERN_ERR "BTRFS: open_ctree failed\n");
@@ -1650,6 +1651,17 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
 
                sb->s_flags |= MS_RDONLY;
 
+               /*
+                * Setting MS_RDONLY will put the cleaner thread to
+                * sleep at the next loop if it's already active.
+                * If it's already asleep, we'll leave unused block
+                * groups on disk until we're mounted read-write again
+                * unless we clean them up here.
+                */
+               mutex_lock(&root->fs_info->cleaner_mutex);
+               btrfs_delete_unused_bgs(fs_info);
+               mutex_unlock(&root->fs_info->cleaner_mutex);
+
                btrfs_dev_replace_suspend_for_unmount(fs_info);
                btrfs_scrub_cancel(fs_info);
                btrfs_pause_balance(fs_info);