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linux/fs/nfsd
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Chuck Lever 6221f1d9b6 SUNRPC: Fix backchannel RPC soft lockups 
Currently, after the forward channel connection goes away,
backchannel operations are causing soft lockups on the server
because call_transmit_status's SOFTCONN logic ignores ENOTCONN.
Such backchannel Calls are aggressively retried until the client
reconnects.

Backchannel Calls should use RPC_TASK_NOCONNECT rather than
RPC_TASK_SOFTCONN. If there is no forward connection, the server is
not capable of establishing a connection back to the client, thus
that backchannel request should fail before the server attempts to
send it. Commit 58255a4e3c ("NFSD: NFSv4 callback client should
use RPC_TASK_SOFTCONN") was merged several years before
RPC_TASK_NOCONNECT was available.

Because setup_callback_client() explicitly sets NOPING, the NFSv4.0
callback connection depends on the first callback RPC to initiate
a connection to the client. Thus NFSv4.0 needs to continue to use
RPC_TASK_SOFTCONN.

Suggested-by: Trond Myklebust <trondmy@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: <stable@vger.kernel.org> # v4.20+
2020-04-17 12:40:31 -04:00
..
acl.h nfsd: eliminate an unnecessary acl size limit 2019-08-28 21:13:45 -04:00
auth.c nfsd: auth: Fix gid sorting when rootsquash enabled 2018-01-22 20:13:07 -08:00
auth.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blocklayout.c nfsd: convert fi_deleg_file and ls_file fields to nfsd_file 2019-08-19 11:09:09 -04:00
blocklayoutxdr.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blocklayoutxdr.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cache.h nfsd4: drc containerization 2019-07-03 17:52:08 -04:00
current_stateid.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 nfsd: export upcalls must not return ESTALE when mountd is down 2020-03-16 12:04:33 -04:00
export.h knfsd: Allow lockless lookups of the exports 2018-10-29 16:58:04 -04:00
fault_inject.c nfsd: no need to check return value of debugfs_create functions 2019-07-03 16:57:17 +02:00
filecache.c fs: nfsd: fileache.c: Use built-in RCU list checking 2020-03-16 12:04:31 -04:00
filecache.h nfsd: convert file cache to use over/underflow safe refcount 2020-02-06 11:22:55 -05:00
flexfilelayout.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
flexfilelayoutxdr.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
flexfilelayoutxdr.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
idmap.h
Kconfig NFSD: Fix NFS server build errors 2020-03-16 12:04:34 -04:00
lockd.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Makefile nfsd: add a new struct file caching facility to nfsd 2019-08-19 11:00:39 -04:00
netns.h nfsd: set the server_scope during service startup 2020-03-16 12:04:30 -04:00
nfs2acl.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nfs3acl.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nfs3proc.c nfsd: Ensure sampling of the write verifier is atomic with the write 2020-01-22 16:25:41 -05:00
nfs3xdr.c nfsd: Ensure sampling of the write verifier is atomic with the write 2020-01-22 16:25:41 -05:00
nfs4acl.c nfsd: check permissions when setting ACLs 2016-06-24 12:11:52 -04:00
nfs4callback.c SUNRPC: Fix backchannel RPC soft lockups 2020-04-17 12:40:31 -04:00
nfs4idmap.c nfsd: export upcalls must not return ESTALE when mountd is down 2020-03-16 12:04:33 -04:00
nfs4layouts.c nfsd: fix delay timer on 32-bit architectures 2019-12-19 17:46:08 -05:00
nfs4proc.c nfsd4: fix double free in nfsd4_do_async_copy() 2020-02-06 11:22:55 -05:00
nfs4recover.c nfsd: make 'boot_time' 64-bit wide 2019-12-19 17:46:08 -05:00
nfs4state.c nfsd: memory corruption in nfsd4_lock() 2020-04-13 10:28:21 -04:00
nfs4xdr.c NFSD: Clean up nfsd4_encode_readv 2020-03-16 12:04:31 -04:00
nfscache.c nfsd4: Fix kernel crash when reading proc file reply_cache_stats 2019-08-16 13:36:55 -04:00
nfsctl.c nfsd: fsnotify on rmdir under nfsd/clients/ 2020-03-19 11:33:42 -04:00
nfsd.h nfsd: remove nfs4_reset_lease() declarations 2019-12-19 22:07:17 -05:00
nfsfh.c nfsd: Add tracing to nfsd_set_fh_dentry() 2020-03-16 12:04:33 -04:00
nfsfh.h nfsd: handle nfs3 timestamps as unsigned 2019-12-19 17:46:08 -05:00
nfsproc.c nfsd: Ensure sampling of the write verifier is atomic with the write 2020-01-22 16:25:41 -05:00
nfssvc.c nfsd: set the server_scope during service startup 2020-03-16 12:04:30 -04:00
nfsxdr.c nfsd: knfsd must use the container user namespace 2019-04-24 09:46:35 -04:00
pnfs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
state.h nfsd: use boottime for lease expiry calculation 2019-12-19 22:07:17 -05:00
stats.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
stats.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace.c
trace.h nfsd: Add tracepoints for update of the expkey and export cache entries 2020-03-16 12:04:33 -04:00
vfs.c nfsd: Ensure sampling of the write verifier is atomic with the write 2020-01-22 16:25:41 -05:00
vfs.h nfsd: Ensure sampling of the write verifier is atomic with the write 2020-01-22 16:25:41 -05:00
xdr3.h nfsd: Ensure sampling of the write verifier is atomic with the write 2020-01-22 16:25:41 -05:00
xdr4.h NFSD add nfs4 inter ssc to nfsd4_copy 2019-12-09 11:44:07 -05:00
xdr4cb.h NFSD CB_OFFLOAD xdr 2018-09-25 20:34:54 -04:00
xdr.h NFSD: Clean up legacy NFS SYMLINK argument XDR decoders 2018-04-03 15:08:16 -04:00