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3453d5708b
linux/fs/nfs
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Trond Myklebust 3453d5708b NFSv4.1: Avoid false retries when RPC calls are interrupted 
A 'false retry' in NFSv4.1 occurs when the client attempts to transmit a
new RPC call using a slot+sequence number combination that references an
already cached one. Currently, the Linux NFS client will do this if a
user process interrupts an RPC call that is in progress.
The problem with doing so is that we defeat the main mechanism used by
the server to differentiate between a new call and a replayed one. Even
if the server is able to perfectly cache the arguments of the old call,
it cannot know if the client intended to replay or send a new call.

The obvious fix is to bump the sequence number pre-emptively if an
RPC call is interrupted, but in order to deal with the corner cases
where the interrupted call is not actually received and processed by
the server, we need to interpret the error NFS4ERR_SEQ_MISORDERED
as a sign that we need to either wait or locate a correct sequence
number that lies between the value we sent, and the last value that
was acked by a SEQUENCE call on that slot.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Tested-by: Jason Tibbitts <tibbs@math.uh.edu>
2019-02-21 13:22:43 -05:00
..
blocklayout NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'. 2018-12-19 13:52:46 -05:00
filelayout pNFS: Don't allocate more pages than we need to fit a layoutget response 2018-09-30 15:35:16 -04:00
flexfilelayout NFS: Fix up documentation warnings 2019-02-20 15:14:21 -05:00
cache_lib.c NFS client updates for Linux 4.15 2017-11-17 14:18:00 -08:00
cache_lib.h NFS client updates for Linux 4.15 2017-11-17 14:18:00 -08:00
callback_proc.c NFSv4.2 copy do not allocate memory under the lock 2018-11-22 13:54:46 -05:00
callback_xdr.c NFS CB_OFFLOAD xdr 2018-08-09 12:56:38 -04:00
callback.c nfs: fixed broken compilation in nfs_callback_up_net() 2018-12-31 11:25:16 -05:00
callback.h NFS CB_OFFLOAD xdr 2018-08-09 12:56:38 -04:00
client.c NFS/SUNRPC: don't lookup machine credential until rpcauth_bindcred(). 2018-12-19 13:52:45 -05:00
delegation.c NFS: Fix up documentation warnings 2019-02-20 15:14:21 -05:00
delegation.h NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'. 2018-12-19 13:52:46 -05:00
dir.c NFS: Fix typo in comments of nfs_readdir_alloc_pages() 2019-02-20 17:33:55 -05:00
direct.c NFS: Pass error information to the pgio error cleanup routine 2019-02-20 15:14:20 -05:00
dns_resolve.c NFS: Fix up a typo in nfs_dns_ent_put 2018-10-29 16:58:04 -04:00
dns_resolve.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
export.c NFS: Pass the inode down to the getattr() callback 2018-06-04 12:07:07 -04:00
file.c pNFS: Avoid read/modify/write when it is not necessary 2019-02-20 17:33:55 -05:00
fscache-index.c vfs: change inode times to use struct timespec64 2018-06-05 16:57:31 -07:00
fscache.c vfs: change inode times to use struct timespec64 2018-06-05 16:57:31 -07:00
fscache.h fscache: Pass object size in rather than calling back for it 2018-04-06 14:05:14 +01:00
getroot.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
inode.c NFS: Fix up documentation warnings 2019-02-20 15:14:21 -05:00
internal.h NFS: readdirplus optimization by cache mechanism 2019-02-20 17:33:55 -05:00
io.c NFS: Fix up documentation warnings 2019-02-20 15:14:21 -05:00
iostat.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig pnfs/blocklayout: require 64-bit sector_t 2017-08-11 14:10:13 -04:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mount_clnt.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
namespace.c NFS: Fix up documentation warnings 2019-02-20 15:14:21 -05:00
netns.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nfs2super.c
nfs2xdr.c vfs: change inode times to use struct timespec64 2018-06-05 16:57:31 -07:00
nfs3_fs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nfs3acl.c nfs: fix xfstest generic/099 failed on nfsv3 2019-02-20 17:33:55 -05:00
nfs3client.c NFS: Remove unused authflavour parameter from nfs_get_client() 2016-12-01 17:46:32 -05:00
nfs3proc.c NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'. 2018-12-19 13:52:46 -05:00
nfs3super.c
nfs3xdr.c NFSv3: Improve NFSv3 performance when server returns no post-op attributes 2018-09-30 15:35:17 -04:00
nfs4_fs.h sunrpc: Add xprt after nfs4_test_session_trunk() 2019-01-02 12:05:19 -05:00
nfs4client.c NFS: drop useless LIST_HEAD 2019-02-20 17:33:55 -05:00
nfs4file.c NFSv4.2 fix unnecessary retry in nfs4_copy_file_range 2019-01-15 11:24:49 -05:00
nfs4getroot.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nfs4idmap.c keys: Fix dependency loop between construction record and auth key 2019-02-15 14:12:09 -08:00
nfs4idmap.h NFS: Move nfs_idmap.h into fs/nfs/ 2015-04-23 15:16:14 -04:00
nfs4namespace.c NFS: Fix up documentation warnings 2019-02-20 15:14:21 -05:00
nfs4proc.c NFSv4.1: Avoid false retries when RPC calls are interrupted 2019-02-21 13:22:43 -05:00
nfs4renewd.c NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'. 2018-12-19 13:52:46 -05:00
nfs4session.c NFSv4.1: Avoid false retries when RPC calls are interrupted 2019-02-21 13:22:43 -05:00
nfs4session.h NFSv4.1: Avoid false retries when RPC calls are interrupted 2019-02-21 13:22:43 -05:00
nfs4state.c NFS: Fix up documentation warnings 2019-02-20 15:14:21 -05:00
nfs4super.c NFS: Move nfs_idmap.h into fs/nfs/ 2015-04-23 15:16:14 -04:00
nfs4sysctl.c nfs: Do not convert nfs_idmap_cache_timeout to jiffies 2018-01-18 15:10:47 -05:00
nfs4trace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nfs4trace.h NFS: Fix NFSv4 symbolic trace point output 2019-01-02 12:05:18 -05:00
nfs4xdr.c NFS: change sign of nfs_fh length 2018-10-23 12:22:21 -04:00
nfs42.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nfs42proc.c NFSv4.2 copy do not allocate memory under the lock 2018-11-22 13:54:46 -05:00
nfs42xdr.c NFS add support for asynchronous COPY 2018-08-09 12:56:39 -04:00
nfs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nfsroot.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nfstrace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nfstrace.h NFS client updates for Linux 4.16 2018-01-30 19:03:48 -08:00
pagelist.c NFS: Fix up documentation warnings 2019-02-20 15:14:21 -05:00
pnfs_dev.c NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'. 2018-12-19 13:52:46 -05:00
pnfs_nfs.c NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'. 2018-12-19 13:52:46 -05:00
pnfs.c NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'. 2018-12-19 13:52:46 -05:00
pnfs.h NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'. 2018-12-19 13:52:46 -05:00
proc.c NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'. 2018-12-19 13:52:46 -05:00
read.c NFS: Pass error information to the pgio error cleanup routine 2019-02-20 15:14:20 -05:00
super.c fs/nfs: Fix nfs_parse_devname to not modify it's argument 2019-02-20 17:33:55 -05:00
symlink.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sysctl.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
unlink.c NFS: Fix up documentation warnings 2019-02-20 15:14:21 -05:00
write.c NFS: Fix up documentation warnings 2019-02-20 15:14:21 -05:00