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2008-04-25lockd: unlock lockd locks held for a certain filesystemWendy Cheng1-0/+1
Add /proc/fs/nfsd/unlock_filesystem, which allows e.g.: shell> echo /mnt/sfs1 > /proc/fs/nfsd/unlock_filesystem so that a filesystem can be unmounted before allowing a peer nfsd to take over nfs service for the filesystem. Signed-off-by: S. Wendy Cheng <[email protected]> Cc: Lon Hohberger <[email protected]> Cc: Christoph Hellwig <[email protected]> Signed-off-by: J. Bruce Fields <[email protected]> fs/lockd/svcsubs.c | 66 +++++++++++++++++++++++++++++++++++++++----- fs/nfsd/nfsctl.c | 65 +++++++++++++++++++++++++++++++++++++++++++ include/linux/lockd/lockd.h | 7 ++++ 3 files changed, 131 insertions(+), 7 deletions(-)
2008-04-25lockd: unlock lockd locks associated with a given server ipWendy Cheng1-1/+6
For high-availability NFS service, we generally need to be able to drop file locks held on the exported filesystem before moving clients to a new server. Currently the only way to do that is by shutting down lockd entirely, which is often undesireable (for example, if you want to continue exporting other filesystems). This patch allows the administrator to release all locks held by clients accessing the client through a given server ip address, by echoing that address to a new file, /proc/fs/nfsd/unlock_ip, as in: shell> echo 10.1.1.2 > /proc/fs/nfsd/unlock_ip The expected sequence of events can be: 1. Tear down the IP address 2. Unexport the path 3. Write IP to /proc/fs/nfsd/unlock_ip to unlock files 4. Signal peer to begin take-over. For now we only support IPv4 addresses and NFSv2/v3 (NFSv4 locks are not affected). Also, if unmounting the filesystem is required, we assume at step 3 that clients using the given server ip are the only clients holding locks on the given filesystem; otherwise, an additional patch is required to allow revoking all locks held by lockd on a given filesystem. Signed-off-by: S. Wendy Cheng <[email protected]> Cc: Lon Hohberger <[email protected]> Cc: Christoph Hellwig <[email protected]> Signed-off-by: J. Bruce Fields <[email protected]> fs/lockd/svcsubs.c | 66 +++++++++++++++++++++++++++++++++++++++----- fs/nfsd/nfsctl.c | 65 +++++++++++++++++++++++++++++++++++++++++++ include/linux/lockd/lockd.h | 7 ++++ 3 files changed, 131 insertions(+), 7 deletions(-)
2008-04-19NLM/lockd: Add a reference counter to struct nlm_rqstTrond Myklebust1-0/+1
When we replace the existing synchronous RPC calls with asynchronous calls, the reference count will be needed in order to allow us to examine the result of the RPC call. Signed-off-by: Trond Myklebust <[email protected]>
2008-03-19lockd: bring a few function declarations up to dateChuck Lever1-6/+5
Clean-up: replace __inline__ and use up-to-date function declaration conventions. Signed-off-by: Chuck Lever <[email protected]> Signed-off-by: Trond Myklebust <[email protected]>
2008-03-19NLM: NLM protocol version numbers are u32Chuck Lever1-2/+4
Clean up: RPC protocol version numbers are u32. Make sure we use an appropriate type for NLM version numbers when calling nlm_lookup_host(). Eliminates a harmless mixed sign comparison in nlm_host_lookup(). Signed-off-by: Chuck Lever <[email protected]> Signed-off-by: Trond Myklebust <[email protected]>
2008-02-01NLM: Fix sign of length of NLM variable length stringsChuck Lever1-3/+6
According to The Open Group's NLM specification, NLM callers are variable length strings. XDR variable length strings use an unsigned 32 bit length. And internally, negative string lengths are not meaningful for the Linux NLM implementation. Clean up: Make nlm_lock.len and nlm_reboot.len unsigned integers. This makes the sign of NLM string lengths consistent with the sign of xdr_netobj lengths. Signed-off-by: Chuck Lever <[email protected]> Acked-By: NeilBrown <[email protected]> Signed-off-by: J. Bruce Fields <[email protected]>
2007-07-10NLM: fix source address of callback to clientFrank van Maarseveen1-0/+1
Use the destination address of the original NLM request as the source address in callbacks to the client. Signed-off-by: Frank van Maarseveen <[email protected]> Signed-off-by: Trond Myklebust <[email protected]>
2007-05-07Merge branch 'server-cluster-locking-api' of git://linux-nfs.org/~bfields/linuxLinus Torvalds1-2/+12
* 'server-cluster-locking-api' of git://linux-nfs.org/~bfields/linux: gfs2: nfs lock support for gfs2 lockd: add code to handle deferred lock requests lockd: always preallocate block in nlmsvc_lock() lockd: handle test_lock deferrals lockd: pass cookie in nlmsvc_testlock lockd: handle fl_grant callbacks lockd: save lock state on deferral locks: add fl_grant callback for asynchronous lock return nfsd4: Convert NFSv4 to new lock interface locks: add lock cancel command locks: allow {vfs,posix}_lock_file to return conflicting lock locks: factor out generic/filesystem switch from setlock code locks: factor out generic/filesystem switch from test_lock locks: give posix_test_lock same interface as ->lock locks: make ->lock release private data before returning in GETLK case locks: create posix-to-flock helper functions locks: trivial removal of unnecessary parentheses
2007-05-06lockd: pass cookie in nlmsvc_testlockMarc Eshel1-2/+2
Change NLM internal interface to pass more information for test lock; we need this to make sure the cookie information is pushed down to the place where we do request deferral, which is handled for testlock by the following patch. Signed-off-by: Marc Eshel <[email protected]> Signed-off-by: J. Bruce Fields <[email protected]>
2007-05-06lockd: save lock state on deferralMarc Eshel1-0/+10
We need to keep some state for a pending asynchronous lock request, so this patch adds that state to struct nlm_block. This also adds a function which defers the request, by calling rqstp->rq_chandle.defer and storing the resulting deferred request in a nlm_block structure which we insert into lockd's global block list. That new function isn't called yet, so it's dead code until a later patch. Signed-off-by: Marc Eshel <[email protected]> Signed-off-by: J. Bruce Fields <[email protected]>
2007-04-30NLM: Shrink the maximum request size of NLM4 requestsChuck Lever1-1/+1
NLM version 4 requests estimate the call and reply header sizes rather conservatively, using the very maximum size allowed in the protocol even though Linux always uses only a small fraction of the allowable space. Reduce the size of caller and lock arguments to conserve RPC buffer space while XDR encoding NLM4 arguments. Add compile-time checks to ensure the hostname string won't overflow NLM protocol maximums. Signed-off-by: Chuck Lever <[email protected]> Signed-off-by: Trond Myklebust <[email protected]>
2006-12-13[PATCH] lockd endianness annotationsAl Viro1-1/+1
Annotated, all places switched to keeping status net-endian. Signed-off-by: Al Viro <[email protected]> Acked-by: Trond Myklebust <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-12-08[PATCH] struct path: convert lockdJosef Sipek1-1/+1
Signed-off-by: Josef Sipek <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-12-07[PATCH] fs/lockd/host.c: make 2 functions staticAdrian Bunk1-2/+0
Make the following needlessly global functions static: - nlm_lookup_host() - nsm_find() Signed-off-by: Adrian Bunk <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-10-20[PATCH] lockd endianness annotationsAl Viro1-6/+6
Signed-off-by: Alexey Dobriyan <[email protected]> Signed-off-by: Al Viro <[email protected]> Acked-by: Trond Myklebust <[email protected]> Acked-by: Neil Brown <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-10-04[PATCH] Convert lockd to use the newer mutex instead of the older semaphoreNeil Brown1-1/+1
Both the (recently introduces) nsm_sema and the older f_sema are converted over. Cc: Olaf Kirch <[email protected]> Signed-off-by: Neil Brown <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-10-04[PATCH] knfsd: match GRANTED_RES replies using cookiesOlaf Kirch1-1/+1
When we send a GRANTED_MSG call, we current copy the NLM cookie provided in the original LOCK call - because in 1996, some broken clients seemed to rely on this bug. However, this means the cookies are not unique, so that when the client's GRANTED_RES message comes back, we cannot simply match it based on the cookie, but have to use the client's IP address in addition. Which breaks when you have a multi-homed NFS client. The X/Open spec explicitly mentions that clients should not expect the same cookie; so one may hope that any clients that were broken in 1996 have either been fixed or rendered obsolete. Signed-off-by: Olaf Kirch <[email protected]> Signed-off-by: Neil Brown <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-10-04[PATCH] knfsd: make nlmclnt_next_cookie SMP safeOlaf Kirch1-0/+1
The way we incremented the NLM cookie in nlmclnt_next_cookie was not thread safe. This patch changes the counter to an atomic_t Signed-off-by: Olaf Kirch <[email protected]> Signed-off-by: Neil Brown <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-10-04[PATCH] knfsd: lockd: optionally use hostnames for identifying peersOlaf Kirch1-0/+1
This patch adds the nsm_use_hostnames sysctl and module param. If set, lockd will use the client's name (as given in the NLM arguments) to find the NSM handle. This makes recovery work when the NFS peer is multi-homed, and the reboot notification arrives from a different IP than the original lock calls. Signed-off-by: Olaf Kirch <[email protected]> Signed-off-by: Neil Brown <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-10-04[PATCH] knfsd: simplify nlmsvc_invalidate_allNeilBrown1-3/+1
As a result of previous patches, the loop in nlmsvc_invalidate_all just sets h_expires for all client/hosts to 0 (though does it in a very complicated way). This was possibly meant to trigger early garbage collection but half the time '0' is in the future and so it infact delays garbage collection. Pre-aging the 'hosts' is not really needed at this point anyway so we throw out the loop and nlm_find_client which is no longer needed. Signed-off-by: Neil Brown <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-10-04[PATCH] knfsd: lockd: make nlm_traverse_* more flexibleOlaf Kirch1-8/+7
This patch makes nlm_traverse{locks,blocks,shares} and friends use a function pointer rather than a "action" enum. This function pointer is given two nlm_hosts (one given by the caller, the other taken from the lock/block/share currently visited), and is free to do with them as it wants. If it returns a non-zero value, the lockd/block/share is released. Signed-off-by: Olaf Kirch <[email protected]> Signed-off-by: Neil Brown <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-10-04[PATCH] knfsd: change nlm_file to use a hlistOlaf Kirch1-2/+1
This changes struct nlm_file and the nlm_files hash table to use a hlist instead of the home-grown lists. This allows us to remove f_hash which was only used to find the right hash chain to delete an entry from. It also increases the size of the nlm_files hash table from 32 to 128. Signed-off-by: Olaf Kirch <[email protected]> Signed-off-by: Neil Brown <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-10-04[PATCH] knfsd: lockd: Change list of blocked list to list_nodeOlaf Kirch1-4/+3
This patch changes the nlm_blocked list to use a list_node instead of homegrown linked list handling. Signed-off-by: Olaf Kirch <[email protected]> Signed-off-by: Neil Brown <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-10-04[PATCH] knfsd: lockd: make the hash chains use a hlist_nodeOlaf Kirch1-1/+1
Get rid of the home-grown singly linked lists for the nlm_host hash table. Signed-off-by: Olaf Kirch <[email protected]> Signed-off-by: Neil Brown <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-10-04[PATCH] knfsd: lockd: Make nlm_host_rebooted use the nsm_handleOlaf Kirch1-2/+2
This patch makes the SM_NOTIFY handling understand and use the nsm_handle. To make it a bit clear what is happening: nlmclent_prepare_reclaim and nlmclnt_finish_reclaim get open-coded into 'reclaimer' The result is tidied up. Then some of that functionality is moved out into nlm_host_rebooted (which calls nlmclnt_recovery which starts a thread which runs reclaimer). Also host_rebooted now finds an nsm_handle rather than a host, then then iterates over all hosts and deals with each host that shares that nsm_handle. Signed-off-by: Olaf Kirch <[email protected]> Signed-off-by: Neil Brown <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-10-04[PATCH] knfsd: lockd: introduce nsm_handleOlaf Kirch1-3/+14
This patch introduces the nsm_handle, which is shared by all nlm_host objects referring to the same client. With this patch applied, all nlm_hosts from the same address will share the same nsm_handle. A future patch will add sharing by name. Note: this patch changes h_name so that it is no longer guaranteed to be an IP address of the host. When the host represents an NFS server, h_name will be the name passed in the mount call. When the host represents a client, h_name will be the name presented in the lock request received from the client. A h_name is only used for printing informational messages, this change should not be significant. Signed-off-by: Olaf Kirch <[email protected]> Signed-off-by: Neil Brown <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-10-04[PATCH] knfsd: when looking up a lockd host, pass hostname & lengthOlaf Kirch1-3/+3
This patch adds the peer's hostname (and name length) to all calls to nlm*_lookup_host functions. A subsequent patch will make use of these (is requested by a sysctl). Signed-off-by: Olaf Kirch <[email protected]> Signed-off-by: Neil Brown <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-10-04[PATCH] knfsd: consolidate common code for statd->lockd notificationOlaf Kirch1-2/+3
Common code from nlm4svc_proc_sm_notify and nlmsvc_proc_sm_notify is moved into a new nlm_host_rebooted. This is in preparation of a patch that will change the reboot notification handling entirely. Signed-off-by: Olaf Kirch <[email protected]> Signed-off-by: Neil Brown <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-10-02[PATCH] namespaces: utsname: switch to using uts namespacesSerge E. Hallyn1-1/+1
Replace references to system_utsname to the per-process uts namespace where appropriate. This includes things like uname. Changes: Per Eric Biederman's comments, use the per-process uts namespace for ELF_PLATFORM, sunrpc, and parts of net/ipv4/ipconfig.c [[email protected]: UML fix] [[email protected]: cleanup] [[email protected]: build fix] Signed-off-by: Serge E. Hallyn <[email protected]> Cc: Kirill Korotaev <[email protected]> Cc: "Eric W. Biederman" <[email protected]> Cc: Herbert Poetzl <[email protected]> Cc: Andrey Savochkin <[email protected]> Signed-off-by: Cedric Le Goater <[email protected]> Cc: Jeff Dike <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-08-03NLM/lockd: remove b_doneJ. Bruce Fields1-1/+0
We never actually set the b_done field any more; it's always zero. Signed-off-by: J. Bruce Fields <[email protected]> Signed-off-by: Trond Myklebust <[email protected]> (cherry picked from af8412d4283ef91356e65e0ed9b025b376aebded commit)
2006-06-20Merge branch 'master' of /home/trondmy/kernel/linux-2.6/Trond Myklebust1-1/+0
Conflicts: include/linux/nfs_fs.h Fixed up conflict with kernel header updates.
2006-06-09NLM: Fix reclaim racesTrond Myklebust1-0/+1
Currently it is possible for a task to remove its locks at the same time as the NLM recovery thread is trying to recover them. This quickly leads to an Oops. Protect the locks using an rw semaphore while they are being recovered. Signed-off-by: Trond Myklebust <[email protected]>
2006-06-09NLM: sem to mutex conversionTrond Myklebust1-1/+1
Signed-off-by: Trond Myklebust <[email protected]>
2006-06-09locks.c: add the fl_owner to nlm_compare_locksMarc Eshel1-0/+1
Add the fl_owner to NLM compare locks. Since two different client can present the same pid to the server it is not enough to distinguish locks from different clients. The fl_owner field is a pointer to the struct nlm_host which is unique for each client. Signed-off-by: Marc Eshel <[email protected]> Signed-off-by: Trond Myklebust <[email protected]>
2006-04-26Don't include linux/config.h from anywhere else in include/David Woodhouse1-1/+0
Signed-off-by: David Woodhouse <[email protected]>
2006-03-20LOCKD: nlmsvc_traverse_blocks return is unusedJ. Bruce Fields1-1/+1
Note that we never return non-zero. Signed-off-by: J. Bruce Fields <[email protected]> Signed-off-by: Trond Myklebust <[email protected]>
2006-03-20lockd: Add helper for *_RES callbacksTrond Myklebust1-0/+1
Signed-off-by: Trond Myklebust <[email protected]>
2006-03-20NLM: Add nlmclnt_release_callTrond Myklebust1-4/+6
Add a helper function to simplify the freeing of NLM client requests. Signed-off-by: Trond Myklebust <[email protected]>
2006-03-20NLM: Simplify client locksTrond Myklebust1-4/+3
Signed-off-by: Trond Myklebust <[email protected]>
2006-03-20lockd: stop abusing file_lock_listChristoph Hellwig1-0/+2
Currently lockd directly access the file_lock_list from fs/locks.c. It does so to mark locks granted or reclaimable. This is very suboptimal, because a) lockd needs to poke into locks.c internals, and b) it needs to iterate over all locks in the system for marking locks granted or reclaimable. This patch adds lists for granted and reclaimable locks to the nlm_host structure instead, and adds locks to those. nlmclnt_lock: now adds the lock to h_granted instead of setting the NFS_LCK_GRANTED, still O(1) nlmclnt_mark_reclaim: goes away completely, replaced by a list_splice_init. Complexity reduced from O(locks in the system) to O(1) reclaimer: iterates over h_reclaim now, complexity reduced from O(locks in the system) to O(locks per nlm_host) Signed-off-by: Christoph Hellwig <[email protected]> Signed-off-by: Trond Myklebust <[email protected]>
2006-03-20lockd: Clean up of the server-side GRANTED codeTrond Myklebust1-2/+0
Signed-off-by: Trond Myklebust <[email protected]>
2006-03-20lockd: Add refcounting to struct nlm_blockTrond Myklebust1-1/+2
Otherwise, the block may disappear from underneath us when in nlmsvc_retry_blocked. Signed-off-by: Trond Myklebust <[email protected]>
2006-02-14[PATCH] NLM: Fix the NLM_GRANTED callback checksTrond Myklebust1-3/+3
If 2 threads attached to the same process are blocking on different locks on different files (maybe even on different servers) but have the same lock arguments (i.e. same offset+length - actually quite common, since most processes try to lock the entire file) then the first GRANTED call that wakes one up will also wake the other. Currently when the NLM_GRANTED callback comes in, lockd walks the list of blocked locks in search of a match to the lock that the NLM server has granted. Although it checks the lock pid, start and end, it fails to check the filehandle and the server address. By checking the filehandle and server IP address, we ensure that this only happens if the locks truly are referencing the same file. Signed-off-by: Trond Myklebust <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
2006-02-01NLM: Ensure that nlmclnt_cancel_callback() doesn't loop foreverTrond Myklebust1-0/+1
If the server returns NLM_LCK_DENIED_NOLOCKS, we currently retry the entire NLM_CANCEL request. This may end up looping forever unless the server changes its mind (why would it do that, though?). Ensure that we limit the number of retries (to 3). See bug# 5957 in bugzilla.kernel.org. Signed-off-by: Trond Myklebust <[email protected]>
2006-02-01NLM: Fix arguments to NLM_CANCEL callTrond Myklebust1-1/+0
The OpenGroup docs state that the arguments "block", "exclusive" and "alock" must exactly match the arguments for the lock call that we are trying to cancel. Currently, "block" is always set to false, which is wrong. See bug# 5956 on bugzilla.kernel.org. Signed-off-by: Trond Myklebust <[email protected]>
2006-01-06RPC: Clean up RPC task structureTrond Myklebust1-1/+1
Shrink the RPC task structure. Instead of storing separate pointers for task->tk_exit and task->tk_release, put them in a structure. Also pass the user data pointer as a parameter instead of passing it via task->tk_calldata. This enables us to nest callbacks. Signed-off-by: Trond Myklebust <[email protected]>
2005-06-22[PATCH] NLM: fix a client-side race on blocking locks.Trond Myklebust1-1/+6
If the lock blocks, the server may send us a GRANTED message that races with the reply to our LOCK request. Make sure that we catch the GRANTED by queueing up our request on the nlm_blocked list before we send off the first LOCK rpc call. Signed-off-by: Trond Myklebust <[email protected]>
2005-04-16Linux-2.6.12-rc2Linus Torvalds1-0/+224
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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