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2022-02-05lockd: fix failure to cleanup client locksJ. Bruce Fields1-0/+1
commit d19a7af73b5ecaac8168712d18be72b9db166768 upstream. In my testing, we're sometimes hitting the request->fl_flags & FL_EXISTS case in posix_lock_inode, presumably just by random luck since we're not actually initializing fl_flags here. This probably didn't matter before commit 7f024fcd5c97 ("Keep read and write fds with each nlm_file") since we wouldn't previously unlock unless we knew there were locks. But now it causes lockd to give up on removing more locks. We could just initialize fl_flags, but really it seems dubious to be calling vfs_lock_file with random values in some of the fields. Fixes: 7f024fcd5c97 ("Keep read and write fds with each nlm_file") Signed-off-by: J. Bruce Fields <bfields@redhat.com> [ cel: fixed checkpatch.pl nit ] Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-02-05lockd: fix server crash on reboot of client holding lockJ. Bruce Fields1-8/+9
commit 6e7f90d163afa8fc2efd6ae318e7c20156a5621f upstream. I thought I was iterating over the array when actually the iteration is over the values contained in the array? Ugh, keep it simple. Symptoms were a null deference in vfs_lock_file() when an NFSv3 client that previously held a lock came back up and sent a notify. Reported-by: Jonathan Woithe <jwoithe@just42.net> Fixes: 7f024fcd5c97 ("Keep read and write fds with each nlm_file") Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-09-22Merge tag 'nfsd-5.15-2' of ↵Linus Torvalds1-11/+2
git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux Pull nfsd fixes from Chuck Lever: "Critical bug fixes: - Fix crash in NLM TEST procedure - NFSv4.1+ backchannel not restored after PATH_DOWN" * tag 'nfsd-5.15-2' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux: nfsd: back channel stuck in SEQ4_STATUS_CB_PATH_DOWN NLM: Fix svcxdr_encode_owner()
2021-09-17NLM: Fix svcxdr_encode_owner()Chuck Lever1-11/+2
Dai Ngo reports that, since the XDR overhaul, the NLM server crashes when the TEST procedure wants to return NLM_DENIED. There is a bug in svcxdr_encode_owner() that none of our standard test cases found. Replace the open-coded function with a call to an appropriate pre-fabricated XDR helper. Reported-by: Dai Ngo <Dai.Ngo@oracle.com> Fixes: a6a63ca5652e ("lockd: Common NLM XDR helpers") Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-09-04Merge tag 'nfs-for-5.15-1' of git://git.linux-nfs.org/projects/anna/linux-nfsLinus Torvalds1-0/+2
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() ...
2021-08-26lockd: don't attempt blocking locks on nfs reexportsJ. Bruce Fields1-3/+10
As in the v4 case, it doesn't work well to block waiting for a lock on an nfs filesystem. As in the v4 case, that means we're depending on the client to poll. It's probably incorrect to depend on that, but I *think* clients do poll in practice. In any case, it's an improvement over hanging the lockd thread indefinitely as we currently are. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Acked-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-08-24Keep read and write fds with each nlm_fileJ. Bruce Fields4-39/+96
We shouldn't really be using a read-only file descriptor to take a write lock. Most filesystems will put up with it. But NFS, for example, won't. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-08-23lockd: update nlm_lookup_file reexport commentJ. Bruce Fields1-2/+3
Update comment to reflect that we *do* allow reexport, whether it's a good idea or not.... Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-08-23nlm: minor refactoringJ. Bruce Fields2-10/+10
Make this lookup slightly more concise, and prepare for changing how we look this up in a following patch. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-08-23nlm: minor nlm_lookup_file argument changeJ. Bruce Fields3-9/+11
It'll come in handy to get the whole nlm_lock. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-08-21lockd: lockd server-side shouldn't set fl_opsJ. Bruce Fields1-18/+12
Locks have two sets of op arrays, fl_lmops for the lock manager (lockd or nfsd), fl_ops for the filesystem. The server-side lockd code has been setting its own fl_ops, which leads to confusion (and crashes) in the reexport case, where the filesystem expects to be the only one setting fl_ops. And there's no reason for it that I can see-the lm_get/put_owner ops do the same job. Reported-by: Daire Byrne <daire@dneg.com> Tested-by: Daire Byrne <daire@dneg.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-08-17lockd: change the proc_handler for nsm_use_hostnamesJia He1-1/+1
nsm_use_hostnames is a module parameter and it will be exported to sysctl procfs. This is to let user sometimes change it from userspace. But the minimal unit for sysctl procfs read/write it sizeof(int). In big endian system, the converting from/to bool to/from int will cause error for proc items. This patch use a new proc_handler proc_dobool to fix it. Signed-off-by: Jia He <hejianet@gmail.com> Reviewed-by: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> [thuth: Fix typo in commit message] Signed-off-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-08-17lockd: Fix invalid lockowner cast after vfs_test_lockBenjamin Coddington1-1/+1
After calling vfs_test_lock() the pointer to a conflicting lock can be returned, and that lock is not guarunteed to be owned by nlm. In that case, we cannot cast it to struct nlm_lockowner. Instead return the pid of that conflicting lock. Fixes: 646d73e91b42 ("lockd: Show pid of lockd for remote locks") Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2021-08-10SUNRPC: Set rq_auth_stat in the pg_authenticate() calloutChuck Lever1-0/+2
In a few moments, rq_auth_stat will need to be explicitly set to rpc_auth_ok before execution gets to the dispatcher. svc_authenticate() already sets it, but it often gets reset to rpc_autherr_badcred right after that call, even when authentication is successful. Let's ensure that the pg_authenticate callout and svc_set_client() set it properly in every case. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2021-07-07lockd: Update the NLMv4 SHARE results encoder to use struct xdr_streamChuck Lever1-13/+9
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv4 nlm_res results encoder to use struct xdr_streamChuck Lever1-7/+6
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv4 TEST results encoder to use struct xdr_streamChuck Lever1-38/+36
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv4 void results encoder to use struct xdr_streamChuck Lever1-6/+11
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv4 FREE_ALL arguments decoder to use struct xdr_streamChuck Lever1-13/+15
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv4 SHARE arguments decoder to use struct xdr_streamChuck Lever1-73/+26
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv4 SM_NOTIFY arguments decoder to use struct xdr_streamChuck Lever1-13/+26
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv4 nlm_res arguments decoder to use struct xdr_streamChuck Lever1-11/+14
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv4 UNLOCK arguments decoder to use struct xdr_streamChuck Lever1-40/+13
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv4 CANCEL arguments decoder to use struct xdr_streamChuck Lever1-15/+18
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv4 LOCK arguments decoder to use struct xdr_streamChuck Lever1-18/+23
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv4 TEST arguments decoder to use struct xdr_streamChuck Lever1-6/+66
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv4 void arguments decoder to use struct xdr_streamChuck Lever1-7/+10
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv1 SHARE results encoder to use struct xdr_streamChuck Lever1-16/+9
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv1 nlm_res results encoder to use struct xdr_streamChuck Lever1-7/+6
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv1 TEST results encoder to use struct xdr_streamChuck Lever1-39/+35
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv1 void results encoder to use struct xdr_streamChuck Lever1-6/+11
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv1 FREE_ALL arguments decoder to use struct xdr_streamChuck Lever1-13/+15
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv1 SHARE arguments decoder to use struct xdr_streamChuck Lever1-70/+26
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv1 SM_NOTIFY arguments decoder to use struct xdr_streamChuck Lever1-13/+26
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv1 nlm_res arguments decoder to use struct xdr_streamChuck Lever1-11/+14
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv1 UNLOCK arguments decoder to use struct xdr_streamChuck Lever1-40/+13
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv1 CANCEL arguments decoder to use struct xdr_streamChuck Lever1-15/+19
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv1 LOCK arguments decoder to use struct xdr_streamChuck Lever1-18/+23
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv1 TEST arguments decoder to use struct xdr_streamChuck Lever1-6/+66
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Update the NLMv1 void argument decoder to use struct xdr_streamChuck Lever1-7/+10
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Common NLM XDR helpersChuck Lever1-0/+151
Add a .h file containing xdr_stream-based XDR helpers common to both NLMv3 and NLMv4. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-07-07lockd: Create a simplified .vs_dispatch method for NLM requestsChuck Lever1-0/+43
To enable xdr_stream-based encoding and decoding, create a bespoke RPC dispatch function for the lockd service. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2021-01-25SUNRPC: Make trace_svc_process() display the RPC procedure symbolicallyChuck Lever2-0/+48
The next few patches will employ these strings to help make server- side trace logs more human-readable. A similar technique is already in use in kernel RPC client code. Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2020-12-16fs/lockd: convert comma to semicolonZheng Yongjun1-1/+1
Replace a comma between expression statements by a semicolon. Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-12-02lockd: don't use interval-based rebinding over TCPCalum Mackay1-9/+11
NLM uses an interval-based rebinding, i.e. it clears the transport's binding under certain conditions if more than 60 seconds have elapsed since the connection was last bound. This rebinding is not necessary for an autobind RPC client over a connection-oriented protocol like TCP. It can also cause problems: it is possible for nlm_bind_host() to clear XPRT_BOUND whilst a connection worker is in the middle of trying to reconnect, after it had already been checked in xprt_connect(). When the connection worker notices that XPRT_BOUND has been cleared under it, in xs_tcp_finish_connecting(), that results in: xs_tcp_setup_socket: connect returned unhandled error -107 Worse, it's possible that the two can get into lockstep, resulting in the same behaviour repeated indefinitely, with the above error every 300 seconds, without ever recovering, and the connection never being established. This has been seen in practice, with a large number of NLM client tasks, following a server restart. The existing callers of nlm_bind_host & nlm_rebind_host should not need to force the rebind, for TCP, so restrict the interval-based rebinding to UDP only. For TCP, we will still rebind when needed, e.g. on timeout, and connection error (including closure), since connection-related errors on an existing connection, ECONNREFUSED when trying to connect, and rpc_check_timeout(), already unconditionally clear XPRT_BOUND. To avoid having to add the fix, and explanation, to both nlm_bind_host() and nlm_rebind_host(), remove the duplicate code from the former, and have it call the latter. Drop the dprintk, which adds no value over a trace. Signed-off-by: Calum Mackay <calum.mackay@oracle.com> Fixes: 35f5a422ce1a ("SUNRPC: new interface to force an RPC rebind") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2020-10-22Merge tag 'nfsd-5.10' of git://linux-nfs.org/~bfields/linuxLinus Torvalds2-100/+398
Pull nfsd updates from Bruce Fields: "The one new feature this time, from Anna Schumaker, is READ_PLUS, which has the same arguments as READ but allows the server to return an array of data and hole extents. Otherwise it's a lot of cleanup and bugfixes" * tag 'nfsd-5.10' of git://linux-nfs.org/~bfields/linux: (43 commits) NFSv4.2: Fix NFS4ERR_STALE error when doing inter server copy SUNRPC: fix copying of multiple pages in gss_read_proxy_verf() sunrpc: raise kernel RPC channel buffer size svcrdma: fix bounce buffers for unaligned offsets and multiple pages nfsd: remove unneeded break net/sunrpc: Fix return value for sysctl sunrpc.transports NFSD: Encode a full READ_PLUS reply NFSD: Return both a hole and a data segment NFSD: Add READ_PLUS hole segment encoding NFSD: Add READ_PLUS data support NFSD: Hoist status code encoding into XDR encoder functions NFSD: Map nfserr_wrongsec outside of nfsd_dispatch NFSD: Remove the RETURN_STATUS() macro NFSD: Call NFSv2 encoders on error returns NFSD: Fix .pc_release method for NFSv2 NFSD: Remove vestigial typedefs NFSD: Refactor nfsd_dispatch() error paths NFSD: Clean up nfsd_dispatch() variables NFSD: Clean up stale comments in nfsd_dispatch() NFSD: Clean up switch statement in nfsd_dispatch() ...
2020-10-02lockd: Replace PROC() macro with open codeChuck Lever2-100/+398
Clean up: Follow-up on ten-year-old commit b9081d90f5b9 ("NFS: kill off complicated macro 'PROC'") by performing the same conversion in the lockd code. To reduce the chance of error, I copied the original C preprocessor output and then made some minor edits. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2020-09-21Replace HTTP links with HTTPS ones: NFS, SUNRPC, and LOCKD clientsAlexander A. Klimov1-1/+1
Rationale: Reduces attack surface on kernel devs opening the links for MITM as HTTPS traffic is much harder to manipulate. Deterministic algorithm: For each file: If not .svg: For each line: If doesn't contain `\bxmlns\b`: For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`: If both the HTTP and HTTPS versions return 200 OK and serve the same content: Replace HTTP with HTTPS. Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2020-02-04proc: convert everything to "struct proc_ops"Alexey Dobriyan1-6/+6
The most notable change is DEFINE_SHOW_ATTRIBUTE macro split in seq_file.h. Conversion rule is: llseek => proc_lseek unlocked_ioctl => proc_ioctl xxx => proc_xxx delete ".owner = THIS_MODULE" line [akpm@linux-foundation.org: fix drivers/isdn/capi/kcapi_proc.c] [sfr@canb.auug.org.au: fix kernel/sched/psi.c] Link: http://lkml.kernel.org/r/20200122180545.36222f50@canb.auug.org.au Link: http://lkml.kernel.org/r/20191225172546.GB13378@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-11-04NFSv4.1: Don't rebind to the same source port when reconnecting to the serverTrond Myklebust1-1/+2
NFSv2, v3 and NFSv4 servers often have duplicate replay caches that look at the source port when deciding whether or not an RPC call is a replay of a previous call. This requires clients to perform strange TCP gymnastics in order to ensure that when they reconnect to the server, they bind to the same source port. NFSv4.1 and NFSv4.2 have sessions that provide proper replay semantics, that do not look at the source port of the connection. This patch therefore ensures they can ignore the rebind requirement. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
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