gfs2: fix race between gfs2_freeze_func and unmount

[linux.git] / fs / gfs2 / super.c

diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 6d89d0ecec2a7b4b9d8bc3e2fd362e4864c159c4..5b148cf032935218847e964c1cc757775c16d41d 100644 (file)
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -973,8 +973,7 @@ void gfs2_freeze_func(struct work_struct *work)
        if (error) {
                printk(KERN_INFO "GFS2: couldn't get freeze lock : %d\n", error);
                gfs2_assert_withdraw(sdp, 0);
-       }
-       else {
+       } else {
                atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
                error = thaw_super(sb);
                if (error) {
@@ -987,6 +986,8 @@ void gfs2_freeze_func(struct work_struct *work)
                gfs2_glock_dq_uninit(&freeze_gh);
        }
        deactivate_super(sb);
+       clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags);
+       wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN);
        return;
 }
 
@@ -1029,6 +1030,7 @@ static int gfs2_freeze(struct super_block *sb)
                msleep(1000);
        }
        error = 0;
+       set_bit(SDF_FS_FROZEN, &sdp->sd_flags);
 out:
        mutex_unlock(&sdp->sd_freeze_mutex);
        return error;
@@ -1053,7 +1055,7 @@ static int gfs2_unfreeze(struct super_block *sb)
 
        gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
        mutex_unlock(&sdp->sd_freeze_mutex);
-       return 0;
+       return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE);
 }
 
 /**