*/
static int __sync_filesystem(struct super_block *sb, int wait)
{
+ /*
+ * This should be safe, as we require bdi backing to actually
+ * write out data in the first place
+ */
+ if (!sb->s_bdi)
+ return 0;
+
/* Avoid doing twice syncing and cache pruning for quota sync */
if (!wait) {
writeout_quota_sb(sb, -1);
spin_unlock(&sb_lock);
down_read(&sb->s_umount);
- if (!(sb->s_flags & MS_RDONLY) && sb->s_root)
+ if (!(sb->s_flags & MS_RDONLY) && sb->s_root && sb->s_bdi)
__sync_filesystem(sb, wait);
up_read(&sb->s_umount);
ret = err;
return ret;
}
+EXPORT_SYMBOL(file_fsync);
/**
* vfs_fsync_range - helper to sync a range of data & metadata to disk