Trond Myklebust f22e5edd22 NFSv4.1: Prevent a 3-way deadlock between layoutreturn, open and state recovery ... Andy Adamson reports: The state manager is recovering expired state and recovery OPENs are being processed. If kswapd is pruning inodes at the same time, a deadlock can occur when kswapd calls evict_inode on an NFSv4.1 inode with a layout, and the resultant layoutreturn gets an error that the state mangager is to handle, causing the layoutreturn to wait on the (NFS client) cl_rpcwaitq. At the same time an open is waiting for the inode deletion to complete in __wait_on_freeing_inode. If the open is either the open called by the state manager, or an open from the same open owner that is holding the NFSv4 sequence id which causes the OPEN from the state manager to wait for the sequence id on the Seqid_waitqueue, then the state is deadlocked with kswapd. The fix is simply to have layoutreturn ignore all errors except NFS4ERR_DELAY. We already know that layouts are dropped on all server reboots, and that it has to be coded to deal with the "forgetful client model" that doesn't send layoutreturns. Reported-by: Andy Adamson <andros@netapp.com> Link: http://lkml.kernel.org/r/1385402270-14284-1-git-send-email-andros@netapp.com Signed-off-by: Trond Myklebust <Trond.Myklebust@primarydata.com>		2013-12-04 12:32:19 -05:00
..
blocklayout	NFS: Enabling v4.2 should not recompile nfsd and lockd	2013-11-19 16:20:40 -05:00
objlayout	NFSv4.1 use pnfs_device maxcount for the objectlayout gdia_maxcount	2013-06-28 15:34:45 -04:00
cache_lib.c	NFS: simplify and clean cache library	2013-02-15 10:43:36 -05:00
cache_lib.h	NFS: simplify and clean cache library	2013-02-15 10:43:36 -05:00
callback.c	nfs: Use PTR_ERR_OR_ZERO in 'nfs41_callback_up' function	2013-10-28 18:16:55 -04:00
callback.h	NFS: Add in v4.2 callback operation	2013-06-08 16:20:18 -04:00
callback_proc.c	NFS: When displaying session slot numbers, use "%u" consistently	2013-09-03 15:26:30 -04:00
callback_xdr.c	Merge branch 'labeled-nfs' into linux-next	2013-06-28 16:29:51 -04:00
client.c	NFS: cache parsed auth_info in nfs_server	2013-10-28 15:37:43 -04:00
delegation.c	NFSv4: Add tracepoints for debugging delegations	2013-08-22 08:58:24 -04:00
delegation.h	NFSv4: Fix CB_RECALL_ANY to only return delegations that are not in use	2013-04-05 17:03:57 -04:00
dir.c	Merge branch 'fscache' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs into linux-next	2013-10-28 19:36:46 -04:00
direct.c	aio: Kill aio_rw_vect_retry()	2013-07-30 11:53:12 -04:00
dns_resolve.c	NFS: Enabling v4.2 should not recompile nfsd and lockd	2013-11-19 16:20:40 -05:00
dns_resolve.h
file.c	NFS avoid expired credential keys for buffered writes	2013-09-03 15:25:09 -04:00
fscache-index.c
fscache.c	NFS: Use i_writecount to control whether to get an fscache cookie in nfs_open()	2013-09-27 18:40:25 +01:00
fscache.h	NFS: Use i_writecount to control whether to get an fscache cookie in nfs_open()	2013-09-27 18:40:25 +01:00
getroot.c	NFS:Add labels to client function prototypes	2013-06-08 16:20:15 -04:00
idmap.c	NFSv4: Convert idmapper to use the new framework for pipefs dentries	2013-09-01 11:12:42 -04:00
inode.c	NFS: Fix a warning in nfs_setsecurity	2013-11-19 16:20:41 -05:00
internal.h	NFS: Enabling v4.2 should not recompile nfsd and lockd	2013-11-19 16:20:40 -05:00
iostat.h
Kconfig	nfs: fix pnfs Kconfig defaults	2013-11-15 13:41:43 -05:00
Makefile	NFS: Enable slot table helpers for NFSv4.0	2013-09-03 15:26:33 -04:00
mount_clnt.c	nfs: have nfs_mount fake up a auth_flavs list when the server didn't provide it	2013-06-28 15:51:51 -04:00
namespace.c	NFS:Add labels to client function prototypes	2013-06-08 16:20:15 -04:00
netns.h
nfs.h
nfs2super.c
nfs2xdr.c	nfs: Convert nfs2xdr to use kuids and kgids	2013-02-13 06:15:30 -08:00
nfs3acl.c
nfs3client.c
nfs3proc.c	NFSv4: Don't try to recover NFSv4 locks when they are lost.	2013-09-04 12:26:32 -04:00
nfs3super.c
nfs3xdr.c	nfs: Convert nfs3xdr to use kuids and kgids	2013-02-13 06:15:31 -08:00
nfs4_fs.h	NFS: Enabling v4.2 should not recompile nfsd and lockd	2013-11-19 16:20:40 -05:00
nfs4client.c	NFS: add support for multiple sec= mount options	2013-10-28 15:38:02 -04:00
nfs4file.c	Merge branch 'fscache' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs into linux-next	2013-10-28 19:36:46 -04:00
nfs4filelayout.c	NFSv4.1 Use MDS auth flavor for data server connection	2013-09-06 14:49:16 -04:00
nfs4filelayout.h	NFSv4.1: Use layout credentials for get_deviceinfo calls	2013-06-06 16:24:37 -04:00
nfs4filelayoutdev.c	NFSv4.1: Ensure memory ordering between nfs4_ds_connect and nfs4_fl_prepare_ds	2013-09-29 15:58:35 -04:00
nfs4getroot.c	NFSv4: Fix security auto-negotiation	2013-09-07 16:18:30 -04:00
nfs4namespace.c	NFS: add support for multiple sec= mount options	2013-10-28 15:38:02 -04:00
nfs4proc.c	NFSv4.1: Prevent a 3-way deadlock between layoutreturn, open and state recovery	2013-12-04 12:32:19 -05:00
nfs4renewd.c
nfs4session.c	When CONFIG_NFS_V4_1 is not enabled, "make C=2" emits this warning:	2013-09-04 12:26:30 -04:00
nfs4session.h	When CONFIG_NFS_V4_1 is not enabled, "make C=2" emits this warning:	2013-09-04 12:26:30 -04:00
nfs4state.c	nfs: don't retry detect_trunking with RPC_AUTH_UNIX more than once	2013-11-13 19:21:05 -05:00
nfs4super.c	nfs: Use PTR_ERR_OR_ZERO in 'nfs/nfs4super.c'	2013-10-28 18:16:56 -04:00
nfs4sysctl.c
nfs4trace.c	NFSv4.1: Add tracepoints for debugging slot table operations	2013-08-22 08:58:27 -04:00
nfs4trace.h	NFSv4.1: Add tracepoints for debugging test_stateid events	2013-08-22 08:58:27 -04:00
nfs4xdr.c	NFSv4.2: encode_readdir - only ask for labels when doing readdirplus	2013-11-04 16:42:51 -05:00
nfsroot.c
nfstrace.c	NFS: Add event tracing for generic NFS lookups	2013-08-22 08:58:18 -04:00
nfstrace.h	NFS: Add tracepoints for debugging NFS hard links	2013-08-22 08:58:20 -04:00
pagelist.c	NFS: Don't check lock owner compatability unless file is locked (part 2)	2013-09-06 11:27:41 -04:00
pnfs.c	NFSv4: Add tracepoints for debugging reads and writes	2013-08-22 08:58:26 -04:00
pnfs.h	NFSv4.1 Fix gdia_maxcount calculation to fit in ca_maxresponsesize	2013-06-28 15:34:43 -04:00
pnfs_dev.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
proc.c	NFSv4: Don't try to recover NFSv4 locks when they are lost.	2013-09-04 12:26:32 -04:00
read.c	NFSv4: Don't try to recover NFSv4 locks when they are lost.	2013-09-04 12:26:32 -04:00
super.c	NFS: correctly report misuse of "migration" mount option.	2013-11-15 13:41:43 -05:00
symlink.c
sysctl.c
unlink.c	nfs: Remove useless 'error' assignment	2013-10-28 18:16:55 -04:00
write.c	NFS: Don't check lock owner compatibility in writes unless file is locked	2013-09-05 18:11:42 -04:00