There's no need for the cost of this extra virtual function call
during every RPC transaction: the RQ_SECURE bit can be set properly
in ->xpo_recvfrom() instead.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
- Fix a race when creating NFSv4 files
- Revert the use of relaxed bitops
-----BEGIN PGP SIGNATURE-----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=/7AX
-----END PGP SIGNATURE-----
Merge tag 'nfsd-6.2-3' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
Pull nfsd fixes from Chuck Lever:
- Fix a race when creating NFSv4 files
- Revert the use of relaxed bitops
* tag 'nfsd-6.2-3' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
NFSD: Use set_bit(RQ_DROPME)
Revert "SUNRPC: Use RMW bitops in single-threaded hot paths"
nfsd: fix handling of cached open files in nfsd4_open codepath
The premise that "Once an svc thread is scheduled and executing an
RPC, no other processes will touch svc_rqst::rq_flags" is false.
svc_xprt_enqueue() examines the RQ_BUSY flag in scheduled nfsd
threads when determining which thread to wake up next.
Found via KCSAN.
Fixes: 28df098881 ("SUNRPC: Use RMW bitops in single-threaded hot paths")
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
If rdma receive buffer allocate failed, should call rpcrdma_regbuf_free()
to free the send buffer, otherwise, the buffer data will be leaked.
Fixes: bb93a1ae2b ("xprtrdma: Allocate req's regbufs at xprt create time")
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
net/sunrpc/xprtrdma/frwr_ops.c:151:32: warning: variable 'rc' is uninitialized when used here [-Wuninitialized]
trace_xprtrdma_frwr_alloc(mr, rc);
^~
net/sunrpc/xprtrdma/frwr_ops.c:127:8: note: initialize the variable 'rc' to silence this warning
int rc;
^
= 0
1 warning generated.
The tracepoint is intended to record the error returned from
ib_alloc_mr(). In the current code there is no other purpose for
@rc, so simply replace it.
Reported-by: kernel test robot <lkp@intel.com>
Fixes: d8cf39a280c3b0 ('xprtrdma: MR-related memory allocation should be allowed to fail')
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Many memory allocations that xprtrdma does can fail safely. Let's
use this fact to avoid some potential deadlocks: Replace GFP_KERNEL
with GFP flags that do not try hard to acquire memory.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
An attempt to establish a connection can always fail and then be
retried. GFP_KERNEL allocation is not necessary here.
Like MR allocation, establishing a connection is always done in a
worker thread. The new GFP flags align with the flags that would
be returned by rpc_task_gfp_mask() in this case.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
xprtrdma always drives a retry of MR allocation if it should fail.
It should be safe to not use GFP_KERNEL for this purpose rather
than sleeping in the memory allocator.
In theory, if these weaker allocations are attempted first, memory
exhaustion is likely to cause xprtrdma to fail fast and not then
invoke the RDMA core APIs, which still might use GFP_KERNEL.
Also note that rpc_task_gfp_mask() always sets __GFP_NORETRY and
__GFP_NOWARN when an RPC-related allocation is being done in a
worker thread. MR allocation is already always done in worker
threads.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Currently all rpcrdma_regbuf_alloc() call sites pass the same value
as their third argument. That argument can therefore be eliminated.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Commit 1769e6a816 ("xprtrdma: Clean up rpcrdma_create_req()")
added rpcrdma_req_create() with a GFP flags argument in case a
caller might want to avoid waiting for memory.
There has never been a caller that does not pass GFP_KERNEL as
the third argument. That argument can therefore be eliminated.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
xprt_rdma_bc_allocate() is now the only user of RPCRDMA_DEF_GFP.
Replace that macro with the raw flags.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
While setting up a new lab, I accidentally misconfigured the
Ethernet port for a system that tried an NFS mount using RoCE.
This made the NFS server unreachable. The following WARNING
popped on the NFS client while waiting for the mount attempt to
time out:
kernel: workqueue: WQ_MEM_RECLAIM xprtiod:xprt_rdma_connect_worker [rpcrdma] is flushing !WQ_MEM_RECLAI>
kernel: WARNING: CPU: 0 PID: 100 at kernel/workqueue.c:2628 check_flush_dependency+0xbf/0xca
kernel: Modules linked in: rpcsec_gss_krb5 nfsv4 dns_resolver nfs 8021q garp stp mrp llc rfkill rpcrdma>
kernel: CPU: 0 PID: 100 Comm: kworker/u8:8 Not tainted 6.0.0-rc1-00002-g6229f8c054e5 #13
kernel: Hardware name: Supermicro X10SRA-F/X10SRA-F, BIOS 2.0b 06/12/2017
kernel: Workqueue: xprtiod xprt_rdma_connect_worker [rpcrdma]
kernel: RIP: 0010:check_flush_dependency+0xbf/0xca
kernel: Code: 75 2a 48 8b 55 18 48 8d 8b b0 00 00 00 4d 89 e0 48 81 c6 b0 00 00 00 48 c7 c7 65 33 2e be>
kernel: RSP: 0018:ffffb562806cfcf8 EFLAGS: 00010092
kernel: RAX: 0000000000000082 RBX: ffff97894f8c3c00 RCX: 0000000000000027
kernel: RDX: 0000000000000002 RSI: ffffffffbe3447d1 RDI: 00000000ffffffff
kernel: RBP: ffff978941315840 R08: 0000000000000000 R09: 0000000000000000
kernel: R10: 00000000000008b0 R11: 0000000000000001 R12: ffffffffc0ce3731
kernel: R13: ffff978950c00500 R14: ffff97894341f0c0 R15: ffff978951112eb0
kernel: FS: 0000000000000000(0000) GS:ffff97987fc00000(0000) knlGS:0000000000000000
kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kernel: CR2: 00007f807535eae8 CR3: 000000010b8e4002 CR4: 00000000003706f0
kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
kernel: Call Trace:
kernel: <TASK>
kernel: __flush_work.isra.0+0xaf/0x188
kernel: ? _raw_spin_lock_irqsave+0x2c/0x37
kernel: ? lock_timer_base+0x38/0x5f
kernel: __cancel_work_timer+0xea/0x13d
kernel: ? preempt_latency_start+0x2b/0x46
kernel: rdma_addr_cancel+0x70/0x81 [ib_core]
kernel: _destroy_id+0x1a/0x246 [rdma_cm]
kernel: rpcrdma_xprt_connect+0x115/0x5ae [rpcrdma]
kernel: ? _raw_spin_unlock+0x14/0x29
kernel: ? raw_spin_rq_unlock_irq+0x5/0x10
kernel: ? finish_task_switch.isra.0+0x171/0x249
kernel: xprt_rdma_connect_worker+0x3b/0xc7 [rpcrdma]
kernel: process_one_work+0x1d8/0x2d4
kernel: worker_thread+0x18b/0x24f
kernel: ? rescuer_thread+0x280/0x280
kernel: kthread+0xf4/0xfc
kernel: ? kthread_complete_and_exit+0x1b/0x1b
kernel: ret_from_fork+0x22/0x30
kernel: </TASK>
SUNRPC's xprtiod workqueue is WQ_MEM_RECLAIM, so any workqueue that
one of its work items tries to cancel has to be WQ_MEM_RECLAIM to
prevent a priority inversion. The internal workqueues in the
RDMA/core are currently non-MEM_RECLAIM.
Jason Gunthorpe says this about the current state of RDMA/core:
> If you attempt to do a reconnection/etc from within a RECLAIM
> context it will deadlock on one of the many allocations that are
> made to support opening the connection.
>
> The general idea of reclaim is that the entire task context
> working under the reclaim is marked with an override of the gfp
> flags to make all allocations under that call chain reclaim safe.
>
> But rdmacm does allocations outside this, eg in the WQs processing
> the CM packets. So this doesn't work and we will deadlock.
>
> Fixing it is a big deal and needs more than poking WQ_MEM_RECLAIM
> here and there.
So we will change the ULP in this case to avoid the use of
WQ_MEM_RECLAIM where possible. Deadlocks that were possible before
are not fixed, but at least we no longer have a false sense of
confidence that the stack won't allocate memory during memory
reclaim.
Suggested-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Use the standard gfp mask instead of using GFP_NOWAIT. The latter causes
issues when under memory pressure.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
- There is now a backup maintainer for NFSD
Notable fixes:
- Prevent array overruns in svc_rdma_build_writes()
- Prevent buffer overruns when encoding NFSv3 READDIR results
- Fix a potential UAF in nfsd_file_put()
-----BEGIN PGP SIGNATURE-----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=6ugk
-----END PGP SIGNATURE-----
Merge tag 'nfsd-5.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
Pull nfsd fixes from Chuck Lever:
"Notable changes:
- There is now a backup maintainer for NFSD
Notable fixes:
- Prevent array overruns in svc_rdma_build_writes()
- Prevent buffer overruns when encoding NFSv3 READDIR results
- Fix a potential UAF in nfsd_file_put()"
* tag 'nfsd-5.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
SUNRPC: Remove pointer type casts from xdr_get_next_encode_buffer()
SUNRPC: Clean up xdr_get_next_encode_buffer()
SUNRPC: Clean up xdr_commit_encode()
SUNRPC: Optimize xdr_reserve_space()
SUNRPC: Fix the calculation of xdr->end in xdr_get_next_encode_buffer()
SUNRPC: Trap RDMA segment overflows
NFSD: Fix potential use-after-free in nfsd_file_put()
MAINTAINERS: reciprocal co-maintainership for file locking and nfsd
Prevent svc_rdma_build_writes() from walking off the end of a Write
chunk's segment array. Caught with KASAN.
The test that this fix replaces is invalid, and might have been left
over from an earlier prototype of the PCL work.
Fixes: 7a1cbfa180 ("svcrdma: Use parsed chunk lists to construct RDMA Writes")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
- New Features:
- Add support for 'dacl' and 'sacl' attributes
- Bugfixes and Cleanups:
- Fixes for reporting mapping errors
- Fixes for memory allocation errors
- Improve warning message when locks are lost
- Update documentation for the nfs4_unique_id parameter
- Add an explanation of NFSv4 client identifiers
- Ensure the i_size attribute is written to the fscache storage
- Fix freeing uninitialized nfs4_labels
- Better handling when xprtrdma bc_serv is NULL
- Marke qualified async operations as MOVEABLE tasks
-----BEGIN PGP SIGNATURE-----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=0ccI
-----END PGP SIGNATURE-----
Merge tag 'nfs-for-5.19-1' of git://git.linux-nfs.org/projects/anna/linux-nfs
Pull NFS client updates from Anna Schumaker:
"New Features:
- Add support for 'dacl' and 'sacl' attributes
Bugfixes and Cleanups:
- Fixes for reporting mapping errors
- Fixes for memory allocation errors
- Improve warning message when locks are lost
- Update documentation for the nfs4_unique_id parameter
- Add an explanation of NFSv4 client identifiers
- Ensure the i_size attribute is written to the fscache storage
- Fix freeing uninitialized nfs4_labels
- Better handling when xprtrdma bc_serv is NULL
- Mark qualified async operations as MOVEABLE tasks"
* tag 'nfs-for-5.19-1' of git://git.linux-nfs.org/projects/anna/linux-nfs:
NFSv4.1 mark qualified async operations as MOVEABLE tasks
xprtrdma: treat all calls not a bcall when bc_serv is NULL
NFSv4: Fix free of uninitialized nfs4_label on referral lookup.
NFS: Pass i_size to fscache_unuse_cookie() when a file is released
Documentation: Add an explanation of NFSv4 client identifiers
NFS: update documentation for the nfs4_unique_id parameter
NFS: Improve warning message when locks are lost.
NFSv4.1: Enable access to the NFSv4.1 'dacl' and 'sacl' attributes
NFSv4: Add encoders/decoders for the NFSv4.1 dacl and sacl attributes
NFSv4: Specify the type of ACL to cache
NFSv4: Don't hold the layoutget locks across multiple RPC calls
pNFS/files: Fall back to I/O through the MDS on non-fatal layout errors
NFS: Further fixes to the writeback error handling
NFSv4/pNFS: Do not fail I/O when we fail to allocate the pNFS layout
NFS: Memory allocation failures are not server fatal errors
NFS: Don't report errors from nfs_pageio_complete() more than once
NFS: Do not report flush errors in nfs_write_end()
NFS: Don't report ENOSPC write errors twice
NFS: fsync() should report filesystem errors over EINTR/ERESTARTSYS
NFS: Do not report EINTR/ERESTARTSYS as mapping errors
Small collection of incremental improvement patches:
- Minor code cleanup patches, comment improvements, etc from static tools
- Clean the some of the kernel caps, reducing the historical stealth uAPI
leftovers
- Bug fixes and minor changes for rdmavt, hns, rxe, irdma
- Remove unimplemented cruft from rxe
- Reorganize UMR QP code in mlx5 to avoid going through the IB verbs layer
- flush_workqueue(system_unbound_wq) removal
- Ensure rxe waits for objects to be unused before allowing the core to
free them
- Several rc quality bug fixes for hfi1
-----BEGIN PGP SIGNATURE-----
iHUEABYIAB0WIQRRRCHOFoQz/8F5bUaFwuHvBreFYQUCYo+NxgAKCRCFwuHvBreF
YbqSAQDJ+QolaATUvOQUPLbuLopUCJLe95VS15Kl3SNXiVUUFAEA8DLL1s6+WShd
AgypUxGHipx5BAytrn45/WiwuDeEbQ8=
=jgTl
-----END PGP SIGNATURE-----
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
Pull rdma updates from Jason Gunthorpe:
"Small collection of incremental improvement patches:
- Minor code cleanup patches, comment improvements, etc from static
tools
- Clean the some of the kernel caps, reducing the historical stealth
uAPI leftovers
- Bug fixes and minor changes for rdmavt, hns, rxe, irdma
- Remove unimplemented cruft from rxe
- Reorganize UMR QP code in mlx5 to avoid going through the IB verbs
layer
- flush_workqueue(system_unbound_wq) removal
- Ensure rxe waits for objects to be unused before allowing the core
to free them
- Several rc quality bug fixes for hfi1"
* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma: (67 commits)
RDMA/rtrs-clt: Fix one kernel-doc comment
RDMA/hfi1: Remove all traces of diagpkt support
RDMA/hfi1: Consolidate software versions
RDMA/hfi1: Remove pointless driver version
RDMA/hfi1: Fix potential integer multiplication overflow errors
RDMA/hfi1: Prevent panic when SDMA is disabled
RDMA/hfi1: Prevent use of lock before it is initialized
RDMA/rxe: Fix an error handling path in rxe_get_mcg()
IB/core: Fix typo in comment
RDMA/core: Fix typo in comment
IB/hf1: Fix typo in comment
IB/qib: Fix typo in comment
IB/iser: Fix typo in comment
RDMA/mlx4: Avoid flush_scheduled_work() usage
IB/isert: Avoid flush_scheduled_work() usage
RDMA/mlx5: Remove duplicate pointer assignment in mlx5_ib_alloc_implicit_mr()
RDMA/qedr: Remove unnecessary synchronize_irq() before free_irq()
RDMA/hns: Use hr_reg_read() instead of remaining roce_get_xxx()
RDMA/hns: Use hr_reg_xxx() instead of remaining roce_set_xxx()
RDMA/irdma: Add SW mechanism to generate completions on error
...
-----BEGIN PGP SIGNATURE-----
iQFSBAABCAA8FiEEq68RxlopcLEwq+PEeb4+QwBBGIYFAmKKlIAeHHRvcnZhbGRz
QGxpbnV4LWZvdW5kYXRpb24ub3JnAAoJEHm+PkMAQRiGC3oH/iPm/fLG2sJut8My
sU0RC9K+6ESV5h2Qy6k00/lqKstlu4EvBjw4V8vYpx3Q2+hbSFMn2SeWqqqT3Lkk
Zb8KINCFuuyMtdCBb42PV0zhUf5pCQF7ocm/Ae4jllDHtPmqk3WJ6IGtZBK5JBlw
z6RR/wKt0y0MRj9eZyPyYjOee2L2vuVh4tgnexK/4L8g2ZtMMRThhvUzSMWG4zxR
STYYNp0uFcfT1Vt85+ODevFH4TvdECAj+SqAegN+seHLM17YY7M0/WiIYpxGRv8P
lIpDQl4PBU8EBkpI5hkpJ/3qPincbuVOMLsYfxFtpcjjG12vGjFp2krGpS3TedZQ
3mvaJ7c=
=vLke
-----END PGP SIGNATURE-----
Merge tag 'v5.18' into rdma.git for-next
Following patches have dependencies.
Resolve the merge conflict in
drivers/net/ethernet/mellanox/mlx5/core/main.c by keeping the new names
for the fs functions following linux-next:
https://lore.kernel.org/r/20220519113529.226bc3e2@canb.auug.org.au/
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
I noticed CPU pipeline stalls while using perf.
Once an svc thread is scheduled and executing an RPC, no other
processes will touch svc_rqst::rq_flags. Thus bus-locked atomics are
not needed outside the svc thread scheduler.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Split out flags from ib_device::device_cap_flags that are only used
internally to the kernel into kernel_cap_flags that is not part of the
uapi. This limits the device_cap_flags to being the same bitmap that will
be copied to userspace.
This cleanly splits out the uverbs flags from the kernel flags to avoid
confusion in the flags bitmap.
Add some short comments describing which each of the kernel flags is
connected to. Remove unused kernel flags.
Link: https://lore.kernel.org/r/0-v2-22c19e565eef+139a-kern_caps_jgg@nvidia.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Trond Myklebust reports an NFSD crash in svc_rdma_sendto(). Further
investigation shows that the crash occurred while NFSD was handling
a deferred request.
This patch addresses two inter-related issues that prevent request
deferral from working correctly for RPC/RDMA requests:
1. Prevent the crash by ensuring that the original
svc_rqst::rq_xprt_ctxt value is available when the request is
revisited. Otherwise svc_rdma_sendto() does not have a Receive
context available with which to construct its reply.
2. Possibly since before commit 71641d99ce ("svcrdma: Properly
compute .len and .buflen for received RPC Calls"),
svc_rdma_recvfrom() did not include the transport header in the
returned xdr_buf. There should have been no need for svc_defer()
and friends to save and restore that header, as of that commit.
This issue is addressed in a backport-friendly way by simply
having svc_rdma_recvfrom() set rq_xprt_hlen to zero
unconditionally, just as svc_tcp_recvfrom() does. This enables
svc_deferred_recv() to correctly reconstruct an RPC message
received via RPC/RDMA.
Reported-by: Trond Myklebust <trondmy@hammerspace.com>
Link: https://lore.kernel.org/linux-nfs/82662b7190f26fb304eb0ab1bb04279072439d4e.camel@hammerspace.com/
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: <stable@vger.kernel.org>
Highlights include:
Features:
- Switch NFS to use readahead instead of the obsolete readpages.
- Readdir fixes to improve cacheability of large directories when there
are multiple readers and writers.
- Readdir performance improvements when doing a seekdir() immediately
after opening the directory (common when re-exporting NFS).
- NFS swap improvements from Neil Brown.
- Loosen up memory allocation to permit direct reclaim and write back
in cases where there is no danger of deadlocking the writeback code or
NFS swap.
- Avoid sillyrename when the NFSv4 server claims to support the
necessary features to recover the unlinked but open file after reboot.
Bugfixes:
- Patch from Olga to add a mount option to control NFSv4.1 session
trunking discovery, and default it to being off.
- Fix a lockup in nfs_do_recoalesce().
- Two fixes for list iterator variables being used when pointing to the
list head.
- Fix a kernel memory scribble when reading from a non-socket transport
in /sys/kernel/sunrpc.
- Fix a race where reconnecting to a server could leave the TCP socket
stuck forever in the connecting state.
- Patch from Neil to fix a shutdown race which can leave the SUNRPC
transport timer primed after we free the struct xprt itself.
- Patch from Xin Xiong to fix reference count leaks in the NFSv4.2 copy
offload.
- Sunrpc patch from Olga to avoid resending a task on an offlined
transport.
Cleanups:
- Patches from Dave Wysochanski to clean up the fscache code
-----BEGIN PGP SIGNATURE-----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=jeGt
-----END PGP SIGNATURE-----
Merge tag 'nfs-for-5.18-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Pull NFS client updates from Trond Myklebust:
"Highlights include:
Features:
- Switch NFS to use readahead instead of the obsolete readpages.
- Readdir fixes to improve cacheability of large directories when
there are multiple readers and writers.
- Readdir performance improvements when doing a seekdir() immediately
after opening the directory (common when re-exporting NFS).
- NFS swap improvements from Neil Brown.
- Loosen up memory allocation to permit direct reclaim and write back
in cases where there is no danger of deadlocking the writeback code
or NFS swap.
- Avoid sillyrename when the NFSv4 server claims to support the
necessary features to recover the unlinked but open file after
reboot.
Bugfixes:
- Patch from Olga to add a mount option to control NFSv4.1 session
trunking discovery, and default it to being off.
- Fix a lockup in nfs_do_recoalesce().
- Two fixes for list iterator variables being used when pointing to
the list head.
- Fix a kernel memory scribble when reading from a non-socket
transport in /sys/kernel/sunrpc.
- Fix a race where reconnecting to a server could leave the TCP
socket stuck forever in the connecting state.
- Patch from Neil to fix a shutdown race which can leave the SUNRPC
transport timer primed after we free the struct xprt itself.
- Patch from Xin Xiong to fix reference count leaks in the NFSv4.2
copy offload.
- Sunrpc patch from Olga to avoid resending a task on an offlined
transport.
Cleanups:
- Patches from Dave Wysochanski to clean up the fscache code"
* tag 'nfs-for-5.18-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (91 commits)
NFSv4/pNFS: Fix another issue with a list iterator pointing to the head
NFS: Don't loop forever in nfs_do_recoalesce()
SUNRPC: Don't return error values in sysfs read of closed files
SUNRPC: Do not dereference non-socket transports in sysfs
NFSv4.1: don't retry BIND_CONN_TO_SESSION on session error
SUNRPC don't resend a task on an offlined transport
NFS: replace usage of found with dedicated list iterator variable
SUNRPC: avoid race between mod_timer() and del_timer_sync()
pNFS/files: Ensure pNFS allocation modes are consistent with nfsiod
pNFS/flexfiles: Ensure pNFS allocation modes are consistent with nfsiod
NFSv4/pnfs: Ensure pNFS allocation modes are consistent with nfsiod
NFS: Avoid writeback threads getting stuck in mempool_alloc()
NFS: nfsiod should not block forever in mempool_alloc()
SUNRPC: Make the rpciod and xprtiod slab allocation modes consistent
SUNRPC: Fix unx_lookup_cred() allocation
NFS: Fix memory allocation in rpc_alloc_task()
NFS: Fix memory allocation in rpc_malloc()
SUNRPC: Improve accuracy of socket ENOBUFS determination
SUNRPC: Replace internal use of SOCKWQ_ASYNC_NOSPACE
SUNRPC: Fix socket waits for write buffer space
...
rpc tasks can be marked as RPC_TASK_SWAPPER. This causes GFP_MEMALLOC
to be used for some allocations. This is needed in some cases, but not
in all where it is currently provided, and in some where it isn't
provided.
Currently *all* tasks associated with a rpc_client on which swap is
enabled get the flag and hence some GFP_MEMALLOC support.
GFP_MEMALLOC is provided for ->buf_alloc() but only swap-writes need it.
However xdr_alloc_bvec does not get GFP_MEMALLOC - though it often does
need it.
xdr_alloc_bvec is called while the XPRT_LOCK is held. If this blocks,
then it blocks all other queued tasks. So this allocation needs
GFP_MEMALLOC for *all* requests, not just writes, when the xprt is used
for any swap writes.
Similarly, if the transport is not connected, that will block all
requests including swap writes, so memory allocations should get
GFP_MEMALLOC if swap writes are possible.
So with this patch:
1/ we ONLY set RPC_TASK_SWAPPER for swap writes.
2/ __rpc_execute() sets PF_MEMALLOC while handling any task
with RPC_TASK_SWAPPER set, or when handling any task that
holds the XPRT_LOCKED lock on an xprt used for swap.
This removes the need for the RPC_IS_SWAPPER() test
in ->buf_alloc handlers.
3/ xprt_prepare_transmit() sets PF_MEMALLOC after locking
any task to a swapper xprt. __rpc_execute() will clear it.
3/ PF_MEMALLOC is set for all the connect workers.
Reviewed-by: Chuck Lever <chuck.lever@oracle.com> (for xprtrdma parts)
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
When memory is short, new worker threads cannot be created and we depend
on the minimum one rpciod thread to be able to handle everything. So it
must not block waiting for memory.
xprt_dynamic_alloc_slot can block indefinitely. This can tie up all
workqueue threads and NFS can deadlock. So when called from a
workqueue, set __GFP_NORETRY.
The rdma alloc_slot already does not block. However it sets the error
to -EAGAIN suggesting this will trigger a sleep. It does not. As we
can see in call_reserveresult(), only -ENOMEM causes a sleep. -EAGAIN
causes immediate retry.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
When memory is short, new worker threads cannot be created and we depend
on the minimum one rpciod thread to be able to handle everything.
So it must not block waiting for memory.
mempools are particularly a problem as memory can only be released back
to the mempool by an async rpc task running. If all available
workqueue threads are waiting on the mempool, no thread is available to
return anything.
rpc_malloc() can block, and this might cause deadlocks.
So check RPC_IS_ASYNC(), rather than RPC_IS_SWAPPER() to determine if
blocking is acceptable.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
If there are failures then we must not leave the non-NULL pointers with
the error value, otherwise `rpcrdma_ep_destroy` gets confused and tries
free them, resulting in an Oops.
Signed-off-by: Dan Aloni <dan.aloni@vastdata.com>
Acked-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Deprecated. dprintk is no longer used in xprtrdma.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Deprecated. This information is available via tracepoints.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
support for a filehandle format deprecated 20 years ago, and further
xdr-related cleanup from Chuck.
-----BEGIN PGP SIGNATURE-----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=yKBl
-----END PGP SIGNATURE-----
Merge tag 'nfsd-5.16' of git://linux-nfs.org/~bfields/linux
Pull nfsd updates from Bruce Fields:
"A slow cycle for nfsd: mainly cleanup, including Neil's patch dropping
support for a filehandle format deprecated 20 years ago, and further
xdr-related cleanup from Chuck"
* tag 'nfsd-5.16' of git://linux-nfs.org/~bfields/linux: (26 commits)
nfsd4: remove obselete comment
nfsd: document server-to-server-copy parameters
NFSD:fix boolreturn.cocci warning
nfsd: update create verifier comment
SUNRPC: Change return value type of .pc_encode
SUNRPC: Replace the "__be32 *p" parameter to .pc_encode
NFSD: Save location of NFSv4 COMPOUND status
SUNRPC: Change return value type of .pc_decode
SUNRPC: Replace the "__be32 *p" parameter to .pc_decode
SUNRPC: De-duplicate .pc_release() call sites
SUNRPC: Simplify the SVC dispatch code path
SUNRPC: Capture value of xdr_buf::page_base
SUNRPC: Add trace event when alloc_pages_bulk() makes no progress
svcrdma: Split svcrmda_wc_{read,write} tracepoints
svcrdma: Split the svcrdma_wc_send() tracepoint
svcrdma: Split the svcrdma_wc_receive() tracepoint
NFSD: Have legacy NFSD WRITE decoders use xdr_stream_subsegment()
SUNRPC: xdr_stream_subsegment() must handle non-zero page_bases
NFSD: Initialize pointer ni with NULL and not plain integer 0
NFSD: simplify struct nfsfh
...
This minor fix-up keeps GCC from complaining that "last' may be used
uninitialized", which breaks some build workflows that have been running
with all warnings treated as errors.
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Clean up: this field is no longer used.
xprt_rdma_pad_optimize is also no longer used, but is left in place
because it is part of the kernel/userspace API.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This is a buffer to be left persistently registered while a
connection is up. Connection tear-down will automatically DMA-unmap,
invalidate, and dereg the MR. A persistently registered buffer is
lower in cost to provide, and it can never be coalesced into the
RDMA segment that carries the data payload.
An RPC that provisions a Write chunk with a non-aligned length now
uses this MR rather than the tail buffer of the RPC's rq_rcv_buf.
Reviewed-By: Tom Talpey <tom@talpey.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
There are currently three separate purposes being served by single
tracepoints. Split them up, as was done with wc_send.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
There are currently three separate purposes being served by a single
tracepoint here. They need to be split up.
svcrdma_wc_send:
- status is always zero, so there's no value in recording it.
- vendor_err is meaningless unless status is not zero, so
there's no value in recording it.
- This tracepoint is needed only when developing modifications,
so it should be left disabled most of the time.
svcrdma_wc_send_flush:
- As above, needed only rarely, and not an error.
svcrdma_wc_send_err:
- This tracepoint can be left persistently enabled because
completion errors are run-time problems (except for FLUSHED_ERR).
- Tracepoint name now ends in _err to reflect its purpose.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
There are currently three separate purposes being served by a single
tracepoint here. They need to be split up.
svcrdma_wc_recv:
- status is always zero, so there's no value in recording it.
- vendor_err is meaningless unless status is not zero, so
there's no value in recording it.
- This tracepoint is needed only when developing modifications,
so it should be left disabled most of the time.
svcrdma_wc_recv_flush:
- As above, needed only rarely, and not an error.
svcrdma_wc_recv_err:
- received is always zero, so there's no value in recording it.
- This tracepoint can be left enabled because completion
errors are run-time problems (except for FLUSHED_ERR).
- Tracepoint name now ends in _err to reflect its purpose.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
- New Features:
- Better client responsiveness when server isn't replying
- Use refcount_t in sunrpc rpc_client refcount tracking
- Add srcaddr and dst_port to the sunrpc sysfs info files
- Add basic support for connection sharing between servers with multiple NICs`
- Bugfixes and Cleanups:
- Sunrpc tracepoint cleanups
- Disconnect after ib_post_send() errors to avoid deadlocks
- Fix for tearing down rpcrdma_reps
- Fix a potential pNFS layoutget livelock loop
- pNFS layout barrier fixes
- Fix a potential memory corruption in rpc_wake_up_queued_task_set_status()
- Fix reconnection locking
- Fix return value of get_srcport()
- Remove rpcrdma_post_sends()
- Remove pNFS dead code
- Remove copy size restriction for inter-server copies
- Overhaul the NFS callback service
- Clean up sunrpc TCP socket shutdowns
- Always provide aligned buffers to RPC read layers
-----BEGIN PGP SIGNATURE-----
iQIyBAABCAAdFiEEnZ5MQTpR7cLU7KEp18tUv7ClQOsFAmExP7AACgkQ18tUv7Cl
QOshTg/zBz7OfrS23CcLLgNidTJ6S7JOuj1DShG+YzsYXT8f9Nl1DadLM7yAEyok
6JZzC8rXYzJcmYztHZzRyTuzj1+tGGb0u/MrD0bBk42VEel6eOjH/Y9ybn12Gf/E
aqlcJh8hPx44U8oo5EFjRJsg2h28O06vywqhJz+sTbkqKN4hlAgMOo5ysAB+1thg
BrTlR84EKBw5QqxPJ1WPmq9tEyGebU9Yrj1p8f0Uf015IeRNeTOXx3NzmdPshphf
2yJvjumwEzqkcHXTJFDfP6ikIcGPPMNVAOK8DHb+vDGzNsOXW7dDM7GuWA3U8DlU
ZHvyyb05Wwe6Wwg8xwx90FEXcYZFfZbSKmI9z2uoOuGFzNG07zWzPDzRft+qrOvU
VMMwP9oEh71+qesmWTvqIbR2RjxqbCYlTcc8mBrD66DROi6jZ2jznraNC85sxG0Q
b8GE+2SnYr2Q25yehj2xrRlOXyiYNkeeYmIpIquEqH9o7cSyDNJhBWbzIv6x+ith
O/S06ZVKMc9X1nH5t5121XcHrSTMMVA/67WMyKfKMxWnrADAWPQALG+ttoTcbRu7
Txew3Jb+hB8+ZdHAqbPf1l1i+7USQl1CRHMw3GRvNjCL2qcjZb1R7eyJRSQQtUyw
q6SJRGe6Sn1FTUnn96Hv15Zy8VHx+q0cOL/EQVzL1RzJIXYcag==
=Ad/3
-----END PGP SIGNATURE-----
Merge tag 'nfs-for-5.15-1' of git://git.linux-nfs.org/projects/anna/linux-nfs
Pull NFS client updates from Anna Schumaker:
"New Features:
- Better client responsiveness when server isn't replying
- Use refcount_t in sunrpc rpc_client refcount tracking
- Add srcaddr and dst_port to the sunrpc sysfs info files
- Add basic support for connection sharing between servers with multiple NICs`
Bugfixes and Cleanups:
- Sunrpc tracepoint cleanups
- Disconnect after ib_post_send() errors to avoid deadlocks
- Fix for tearing down rpcrdma_reps
- Fix a potential pNFS layoutget livelock loop
- pNFS layout barrier fixes
- Fix a potential memory corruption in rpc_wake_up_queued_task_set_status()
- Fix reconnection locking
- Fix return value of get_srcport()
- Remove rpcrdma_post_sends()
- Remove pNFS dead code
- Remove copy size restriction for inter-server copies
- Overhaul the NFS callback service
- Clean up sunrpc TCP socket shutdowns
- Always provide aligned buffers to RPC read layers"
* tag 'nfs-for-5.15-1' of git://git.linux-nfs.org/projects/anna/linux-nfs: (39 commits)
NFS: Always provide aligned buffers to the RPC read layers
NFSv4.1 add network transport when session trunking is detected
SUNRPC enforce creation of no more than max_connect xprts
NFSv4 introduce max_connect mount options
SUNRPC add xps_nunique_destaddr_xprts to xprt_switch_info in sysfs
SUNRPC keep track of number of transports to unique addresses
NFSv3: Delete duplicate judgement in nfs3_async_handle_jukebox
SUNRPC: Tweak TCP socket shutdown in the RPC client
SUNRPC: Simplify socket shutdown when not reusing TCP ports
NFSv4.2: remove restriction of copy size for inter-server copy.
NFS: Clean up the synopsis of callback process_op()
NFS: Extract the xdr_init_encode/decode() calls from decode_compound
NFS: Remove unused callback void decoder
NFS: Add a private local dispatcher for NFSv4 callback operations
SUNRPC: Eliminate the RQ_AUTHERR flag
SUNRPC: Set rq_auth_stat in the pg_authenticate() callout
SUNRPC: Add svc_rqst::rq_auth_stat
SUNRPC: Add dst_port to the sysfs xprt info file
SUNRPC: Add srcaddr as a file in sysfs
sunrpc: Fix return value of get_srcport()
...
svc_xprt_free() already "puts" the bc_xprt before calling the
transport's "free" method. No need to do it twice.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Relieve contention on sc_rw_ctxt_lock by converting rdma->sc_rw_ctxts
to an llist.
The goal is to reduce the average overhead of Send completions,
because a transport's completion handlers are single-threaded on
one CPU core. This change reduces CPU utilization of each Send
completion by 2-3% on my server.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-By: Tom Talpey <tom@talpey.com>
/proc/lock_stat indicates the the sc_send_lock is heavily
contended when the server is under load from a single client.
To address this, convert the send_ctxt free list to an llist.
Returning an item to the send_ctxt cache is now waitless, which
reduces the instruction path length in the single-threaded Send
handler (svc_rdma_wc_send).
The goal is to enable the ib_comp_wq worker to handle a higher
RPC/RDMA Send completion rate given the same CPU resources. This
change reduces CPU utilization of Send completion by 2-3% on my
server.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-By: Tom Talpey <tom@talpey.com>
Because wake_up() takes an IRQ-safe lock, it can be expensive,
especially to call inside of a single-threaded completion handler.
What's more, the Send wait queue almost never has waiters, so
most of the time, this is an expensive no-op.
As always, the goal is to reduce the average overhead of each
completion, because a transport's completion handlers are single-
threaded on one CPU core. This change reduces CPU utilization of
the Send completion thread by 2-3% on my server.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-By: Tom Talpey <tom@talpey.com>
The xprtrdma client code currently relies on the task that initiated the
connect to hold the XPRT_LOCK for the duration of the connection
attempt. If the task is woken early, due to some other event, then that
lock could get released early.
Avoid races by using the same mechanism that the socket code uses of
transferring lock ownership to the RDMA connect worker itself. That
frees us to call rpcrdma_xprt_disconnect() directly since we're now
guaranteed exclusion w.r.t. other callers.
Fixes: 4cf44be6f1 ("xprtrdma: Fix recursion into rpcrdma_xprt_disconnect()")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Clean up.
Now that there is only one registration mode, there is only one
target "post_send" method: frwr_send(). rpcrdma_post_sends() no
longer adds much value, especially since all of its call sites
ignore the return code value except to check if it's non-zero.
Just have them call frwr_send() directly instead.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Unlike xprtrdma_post_send(), this one can be left enabled all the
time, and should almost never fire. But we do want to know about
immediate errors when they happen.
Note that there is already a similar post_linv_err tracepoint.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
In the vast majority of cases, rc=0. Don't record that in the
post_recvs tracepoint. Instead, add a separate tracepoint that can
be left enabled all the time to capture the very rare immediate
errors returned by ib_post_recv().
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Ensure the tear-down completion is awoken only /after/ we've stopped
fiddling with rpcrdma_rep objects in rpcrdma_post_recvs().
Fixes: 15788d1d10 ("xprtrdma: Do not refresh Receive Queue while it is draining")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Chuck Lever