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38b7631fbe
linux/fs/nfsd
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Andrew Elble 7fc0564e3a nfsd: fix race with open / open upgrade stateids 
We observed multiple open stateids on the server for files that
seemingly should have been closed.

nfsd4_process_open2() tests for the existence of a preexisting
stateid. If one is not found, the locks are dropped and a new
one is created. The problem is that init_open_stateid(), which
is also responsible for hashing the newly initialized stateid,
doesn't check to see if another open has raced in and created
a matching stateid. This fix is to enable init_open_stateid() to
return the matching stateid and have nfsd4_process_open2()
swap to that stateid and switch to the open upgrade path.
In testing this patch, coverage to the newly created
path indicates that the race was indeed happening.

Signed-off-by: Andrew Elble <aweits@rit.edu>
Reviewed-by: Jeff Layton <jlayton@poochiereds.net>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2015-11-10 09:29:45 -05:00
..
acl.h nfsd4: remove nfs4_acl_new 2014-07-08 17:14:27 -04:00
auth.c nfsd: silence sparse warning about accessing credentials 2014-07-17 16:15:35 -04:00
auth.h nfsd: Remove nfsd_luid, nfsd_lgid, nfsd_ruid and nfsd_rgid 2013-02-13 06:15:51 -08:00
blocklayout.c nfsd/blocklayout: accept any minlength 2015-10-09 16:11:40 -04:00
blocklayoutxdr.c pnfs: move common blocklayout XDR defintions to nfs4.h 2015-08-17 13:22:49 -05:00
blocklayoutxdr.h pnfs: move common blocklayout XDR defintions to nfs4.h 2015-08-17 13:22:49 -05:00
cache.h nfsd: Remove the cache_hash list 2014-08-17 12:00:12 -04:00
current_stateid.h nfsd41: use current stateid by value 2012-02-15 11:20:45 -05:00
export.c sunrpc/nfsd: Remove redundant code by exports seq_operations functions 2015-08-13 08:59:02 -04:00
export.h nfsd: include linux/nfs4.h in export.h 2015-08-13 10:21:21 -04:00
fault_inject.c nfsd: remove old fault injection infrastructure 2014-08-05 10:55:10 -04:00
idmap.h nfsd: Remove duplicate define of IDMAP_NAMESZ/IDMAP_TYPE_xx 2015-07-20 14:58:46 -04:00
Kconfig Merge branch 'for-4.1' of git://linux-nfs.org/~bfields/linux 2015-04-24 07:46:05 -07:00
lockd.c
Makefile nfsd: pNFS block layout driver 2015-02-05 14:35:18 +01:00
netns.h nfsd: New counter for generating client confirm verifier 2015-08-10 16:05:47 -04:00
nfs2acl.c nfsd: Add macro NFS_ACL_MASK for ACL 2015-07-20 14:58:46 -04:00
nfs3acl.c nfsd: Add macro NFS_ACL_MASK for ACL 2015-07-20 14:58:46 -04:00
nfs3proc.c VFS: normal filesystems (and lustre): d_inode() annotations 2015-04-15 15:06:57 -04:00
nfs3xdr.c nfsd: switch unsigned char flags in svc_fh to bools 2015-10-12 17:31:04 -04:00
nfs4acl.c nfsd: Fix two typos in comments 2015-08-13 10:26:24 -04:00
nfs4callback.c nfsd: New helper nfsd4_cb_sequence_done() for processing more cb errors 2015-08-13 08:57:06 -04:00
nfs4idmap.c nfsd: Remove duplicate define of IDMAP_NAMESZ/IDMAP_TYPE_xx 2015-07-20 14:58:46 -04:00
nfs4layouts.c nfsd: ensure that seqid morphing operations are atomic wrt to copies 2015-10-23 15:57:33 -04:00
nfs4proc.c nfsd: serialize layout stateid morphing operations 2015-10-23 15:57:32 -04:00
nfs4recover.c nfsd: don't WARN/backtrace for invalid container deployment. 2015-08-31 16:32:08 -04:00
nfs4state.c nfsd: fix race with open / open upgrade stateids 2015-11-10 09:29:45 -05:00
nfs4xdr.c NFSD: Return word2 bitmask if setting security label in OPEN/CREATE 2015-08-31 16:16:40 -04:00
nfscache.c nfsd: remove recurring workqueue job to clean DRC 2015-11-10 09:25:51 -05:00
nfsctl.c nfsd: fix nsfd startup race triggering BUG_ON 2015-04-21 16:16:03 -04:00
nfsd.h nfsd: eliminate NFSD_DEBUG 2015-04-21 16:16:02 -04:00
nfsfh.c nfsd: switch unsigned char flags in svc_fh to bools 2015-10-12 17:31:04 -04:00
nfsfh.h nfsd: switch unsigned char flags in svc_fh to bools 2015-10-12 17:31:04 -04:00
nfsproc.c nfsd: Disable NFSv2 timestamp workaround for NFSv3+ 2015-05-29 11:04:01 -04:00
nfssvc.c nfsd/sunrpc: abstract out svc_set_num_threads to sv_ops 2015-08-10 16:05:43 -04:00
nfsxdr.c VFS: normal filesystems (and lustre): d_inode() annotations 2015-04-15 15:06:57 -04:00
pnfs.h nfsd4: fix v3-less build 2015-02-16 11:43:13 -05:00
state.h nfsd: ensure that seqid morphing operations are atomic wrt to copies 2015-10-23 15:57:33 -04:00
stats.c nfsd: move <linux/nfsd/stats.h> to fs/nfsd 2014-05-06 17:54:55 -04:00
stats.h nfsd: move <linux/nfsd/stats.h> to fs/nfsd 2014-05-06 17:54:55 -04:00
trace.c nfsd: move include of state.h from trace.c to trace.h 2015-10-23 15:57:29 -04:00
trace.h nfsd: move include of state.h from trace.c to trace.h 2015-10-23 15:57:29 -04:00
vfs.c nfsd: switch unsigned char flags in svc_fh to bools 2015-10-12 17:31:04 -04:00
vfs.h nfsd: switch unsigned char flags in svc_fh to bools 2015-10-12 17:31:04 -04:00
xdr3.h nfsd: fix encode_entryplus_baggage stack usage 2014-01-23 13:50:27 -05:00
xdr4.h nfsd: switch unsigned char flags in svc_fh to bools 2015-10-12 17:31:04 -04:00
xdr4cb.h nfsd: implement pNFS layout recalls 2015-02-02 18:09:43 +01:00
xdr.h nfsd: handle vfs_getattr errors in acl protocol 2013-02-26 02:46:09 -05:00