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[PATCH v2 3/3] xfs: fix false assertion at xfs_qm_vop_create_dqattach

To: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
Subject: [PATCH v2 3/3] xfs: fix false assertion at xfs_qm_vop_create_dqattach
From: Jeff Liu <jeff.liu@xxxxxxxxxx>
Date: Tue, 26 Nov 2013 21:38:54 +0800
Delivered-to: xfs@xxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0
From: Jie Liu <jeff.liu@xxxxxxxxxx>

After the previous fix, there still has another ASSERT failure if turning
off any type of quota while fsstress is running at the same time.

Backtrace in this case:

[   50.867897] XFS: Assertion failed: XFS_IS_GQUOTA_ON(mp), file: 
fs/xfs/xfs_qm.c, line: 2118
[   50.867924] ------------[ cut here ]------------
... <snip>
[   50.867957] Kernel BUG at ffffffffa0b55a32 [verbose debug info unavailable]
[   50.867999] invalid opcode: 0000 [#1] SMP
[   50.869407] Call Trace:
[   50.869446]  [<ffffffffa0bc408a>] xfs_qm_vop_create_dqattach+0x19a/0x2d0 
[xfs]
[   50.869512]  [<ffffffffa0b9cc45>] xfs_create+0x5c5/0x6a0 [xfs]
[   50.869564]  [<ffffffffa0b5307c>] xfs_vn_mknod+0xac/0x1d0 [xfs]
[   50.869615]  [<ffffffffa0b531d6>] xfs_vn_mkdir+0x16/0x20 [xfs]
[   50.869655]  [<ffffffff811becd5>] vfs_mkdir+0x95/0x130
[   50.869689]  [<ffffffff811bf63a>] SyS_mkdirat+0xaa/0xe0
[   50.869723]  [<ffffffff811bf689>] SyS_mkdir+0x19/0x20
[   50.869757]  [<ffffffff8170f7dd>] system_call_fastpath+0x1a/0x1f
[   50.869793] Code: 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 <snip>
[   50.870003] RIP  [<ffffffffa0b55a32>] assfail+0x22/0x30 [xfs]
[   50.870050]  RSP <ffff88002941fd60>
[   50.879251] ---[ end trace c93a2b342341c65b ]---

We're hitting the ASSERT(XFS_IS_*QUOTA_ON(mp)) in xfs_qm_vop_create_dqattach(),
however the assertion itself is not right IMHO.  While performing quota off, we
firstly clear the XFS_*QUOTA_ACTIVE bit(s) from struct xfs_mount without taking
any special locks, see xfs_qm_scall_quotaoff().  Hence there is no guarantee
that the desired quota is still active.

Signed-off-by: Jie Liu <jeff.liu@xxxxxxxxxx>
---
 fs/xfs/xfs_qm.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index 81b3cd8..2fcd527 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -2111,24 +2111,21 @@ xfs_qm_vop_create_dqattach(
        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
        ASSERT(XFS_IS_QUOTA_RUNNING(mp));
 
-       if (udqp) {
+       if (udqp && XFS_IS_UQUOTA_ON(mp)) {
                ASSERT(ip->i_udquot == NULL);
-               ASSERT(XFS_IS_UQUOTA_ON(mp));
                ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
 
                ip->i_udquot = xfs_qm_dqhold(udqp);
                xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
        }
-       if (gdqp) {
+       if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
                ASSERT(ip->i_gdquot == NULL);
-               ASSERT(XFS_IS_GQUOTA_ON(mp));
                ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
                ip->i_gdquot = xfs_qm_dqhold(gdqp);
                xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
        }
-       if (pdqp) {
+       if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
                ASSERT(ip->i_pdquot == NULL);
-               ASSERT(XFS_IS_PQUOTA_ON(mp));
                ASSERT(xfs_get_projid(ip) == be32_to_cpu(pdqp->q_core.d_id));
 
                ip->i_pdquot = xfs_qm_dqhold(pdqp);
-- 
1.8.3.2

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