nfs: make pnfs_destroy_layout() wait on commit when inode is being evicted

Otherwise nfs_commit_inode() can set I_DIRTY_DATASYNC in the inode's i_state, allowing the following BUG_ON in evict() to be triggered:

        BUG_ON(inode->i_state != (I_FREEING | I_CLEAR));

---
 fs/nfs/filelayout/filelayout.c         | 2 +-
 fs/nfs/flexfilelayout/flexfilelayout.c | 2 +-
 fs/nfs/nfs4super.c                     | 2 +-
 fs/nfs/pnfs.c                          | 6 +++---
 fs/nfs/pnfs.h                          | 2 +-
 5 files changed, 7 insertions(+), 7 deletions(-)

index 4e54d8b..28b7228 100644
@@ -169,7 +169,7 @@ static int filelayout_async_handle_error(struct rpc_task *task,
 		 * i/o and all i/o waiting on the slot table to the MDS until
 		 * layout is destroyed and a new valid layout is obtained.
 		 */
-		pnfs_destroy_layout(NFS_I(inode));
+		pnfs_destroy_layout(NFS_I(inode), 0);
 		rpc_wake_up(&tbl->slot_tbl_waitq);
 		goto reset;
 	/* RPC connection errors */

index c75ad98..ab0a1e5 100644
@@ -1088,7 +1088,7 @@ static int ff_layout_async_handle_error_v4(struct rpc_task *task,
 		 * i/o and all i/o waiting on the slot table to the MDS until
 		 * layout is destroyed and a new valid layout is obtained.
 		 */
-		pnfs_destroy_layout(NFS_I(inode));
+		pnfs_destroy_layout(NFS_I(inode), 0);
 		rpc_wake_up(&tbl->slot_tbl_waitq);
 		goto reset;
 	/* RPC connection errors */

index 6fb7cb6..3b4a063 100644
@@ -95,7 +95,7 @@ static void nfs4_evict_inode(struct inode *inode)
 	nfs_inode_return_delegation_noreclaim(inode);
 	/* Note that above delegreturn would trigger pnfs return-on-close */
 	pnfs_return_layout(inode);
-	pnfs_destroy_layout(NFS_I(inode));
+	pnfs_destroy_layout(NFS_I(inode), FLUSH_SYNC);
 	/* First call standard NFS clear_inode() code */
 	nfs_clear_inode(inode);
 }

index d602fe9..09e66a8 100644
@@ -696,7 +696,7 @@ pnfs_free_lseg_list(struct list_head *free_me)
 }
 
 void
-pnfs_destroy_layout(struct nfs_inode *nfsi)
+pnfs_destroy_layout(struct nfs_inode *nfsi, int how)
 {
 	struct pnfs_layout_hdr *lo;
 	LIST_HEAD(tmp_list);

@@ -710,7 +710,7 @@ pnfs_destroy_layout(struct nfs_inode *nfsi)
 		pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED);
 		spin_unlock(&nfsi->vfs_inode.i_lock);
 		pnfs_free_lseg_list(&tmp_list);
-		nfs_commit_inode(&nfsi->vfs_inode, 0);
+		nfs_commit_inode(&nfsi->vfs_inode, how);
 		pnfs_put_layout_hdr(lo);
 	} else
 		spin_unlock(&nfsi->vfs_inode.i_lock);

@@ -1849,7 +1849,7 @@ pnfs_update_layout(struct inode *ino,
 			}
 			/* Destroy the existing layout and start over */
 			if (time_after(jiffies, giveup))
-				pnfs_destroy_layout(NFS_I(ino));
+				pnfs_destroy_layout(NFS_I(ino), 0);
 			/* Fallthrough */
 		case -EAGAIN:
 			break;

index 8d507c3..3fe2160 100644
@@ -245,7 +245,7 @@ size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
 void pnfs_free_lseg_list(struct list_head *tmp_list);
-void pnfs_destroy_layout(struct nfs_inode *);
+void pnfs_destroy_layout(struct nfs_inode *, int how);
 void pnfs_destroy_all_layouts(struct nfs_client *);
 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
 		struct nfs_fsid *fsid,

2.9.5

Hi Scott,

                    ^~~~~~~~~~~~~~~~~~~

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Okay, I'll try that out. Thanks for looking!
-Scott

If there were no commit requests, then nfs_commit_inode() should not wait on the commit or mark the inode dirty, otherwise the following BUG_ON can be triggered:

[ 1917.130762] kernel BUG at fs/inode.c:578!
[ 1917.130766] Oops: Exception in kernel mode, sig: 5 [#1]
[ 1917.130768] SMP NR_CPUS=2048 NUMA pSeries
[ 1917.130772] Modules linked in: iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi blocklayoutdriver rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache sunrpc sg nx_crypto pseries_rng ip_tables xfs libcrc32c sd_mod crc_t10dif crct10dif_generic crct10dif_common ibmvscsi scsi_transport_srp ibmveth scsi_tgt dm_mirror dm_region_hash dm_log dm_mod
[ 1917.130805] CPU: 2 PID: 14923 Comm: umount.nfs4 Tainted: G               ------------ T 3.10.0-768.el7.ppc64 #1
[ 1917.130810] task: c0000005ecd88040 ti: c00000004cea0000 task.ti: c00000004cea0000
[ 1917.130813] NIP: c000000000354178 LR: c000000000354160 CTR: c00000000012db80
[ 1917.130816] REGS: c00000004cea3720 TRAP: 0700   Tainted: G               ------------ T  (3.10.0-768.el7.ppc64)
[ 1917.130820] MSR: 8000000100029032 <SF,EE,ME,IR,DR,RI>  CR: 22002822  XER: 20000000
[ 1917.130828] CFAR: c00000000011f594 SOFTE: 1

GPR00: c000000000354160 c00000004cea39a0 c0000000014c4700 c0000000018cc750
GPR04: 000000000000c750 80c0000000000000 0600000000000000 04eeb76bea749a03
GPR08: 0000000000000034 c0000000018cc758 0000000000000001 d000000005e619e8
GPR12: c00000000012db80 c000000007b31200 0000000000000000 0000000000000000
GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR24: 0000000000000000 c000000000dfc3ec 0000000000000000 c0000005eefc02c0
GPR28: d0000000079dbd50 c0000005b94a02c0 c0000005b94a0250 c0000005b94a01c8

[ 1917.130867] NIP [c000000000354178] .evict+0x1c8/0x350
[ 1917.130871] LR [c000000000354160] .evict+0x1b0/0x350
[ 1917.130873] Call Trace:
[ 1917.130876] [c00000004cea39a0] [c000000000354160] .evict+0x1b0/0x350 (unreliable)
[ 1917.130880] [c00000004cea3a30] [c0000000003558cc] .evict_inodes+0x13c/0x270
[ 1917.130884] [c00000004cea3af0] [c000000000327d20] .kill_anon_super+0x70/0x1e0
[ 1917.130896] [c00000004cea3b80] [d000000005e43e30] .nfs_kill_super+0x20/0x60 [nfs]
[ 1917.130900] [c00000004cea3c00] [c000000000328a20] .deactivate_locked_super+0xa0/0x1b0
[ 1917.130903] [c00000004cea3c80] [c00000000035ba54] .cleanup_mnt+0xd4/0x180
[ 1917.130907] [c00000004cea3d10] [c000000000119034] .task_work_run+0x114/0x150
[ 1917.130912] [c00000004cea3db0] [c00000000001ba6c] .do_notify_resume+0xcc/0x100
[ 1917.130916] [c00000004cea3e30] [c00000000000a7b0] .ret_from_except_lite+0x5c/0x60
[ 1917.130919] Instruction dump:
[ 1917.130921] 7fc3f378 486734b5 60000000 387f00a0 38800003 4bdcb365 60000000 e95f00a0
[ 1917.130927] 694a0060 7d4a0074 794ad182 694a0001 <0b0a0000> 892d02a4 2f890000 40de0134

---
 fs/nfs/write.c | 2 ++
 1 file changed, 2 insertions(+)

index 5b5f464..4a379d7 100644
@@ -1890,6 +1890,8 @@ int nfs_commit_inode(struct inode *inode, int how)
 	if (res)
 		error = nfs_generic_commit_list(inode, &head, how, &cinfo);
 	nfs_commit_end(cinfo.mds);
+	if (res == 0)
+		return res;
 	if (error < 0)
 		goto out_error;
 	if (!may_wait)

2.9.5

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