Subject: [PATCH] quota: Don't call sync_fs() from vfs_quota_off() when there's no quota turn off From: Jan Kara Sometimes, vfs_quota_off() is called on a partially set up super block (for example when fill_super() fails for some reason). In such cases we cannot call ->sync_fs() because it can Oops because of not properly filled in super block. So in case we find there's not quota to turn off, we just skip everything and return which fixes the above problem. Signed-off-by: Jan Kara --- fs/dquot.c | 10 ++++++++++ 1 file changed, 10 insertions(+) --- a/fs/dquot.c +++ b/fs/dquot.c @@ -1491,6 +1491,16 @@ int vfs_quota_off(struct super_block *sb /* We need to serialize quota_off() for device */ mutex_lock(&dqopt->dqonoff_mutex); + + /* + * Skip everything if there's nothing to do. We have to do this becase + * sometimes we are called when fill_super() failed and calling + * sync_fs() in such cases does no good. + */ + if (!sb_any_quota_enabled(sb) && !sb_any_quota_suspended(sb)) { + mutex_unlock(&dqopt->dqonoff_mutex); + return 0; + } for (cnt = 0; cnt < MAXQUOTAS; cnt++) { toputinode[cnt] = NULL; if (type != -1 && cnt != type)