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* seq_file: constify seq_operationsJames Morris2009-09-231-6/+6
| | | | | | | | | | | | | | Make all seq_operations structs const, to help mitigate against revectoring user-triggerable function pointers. This is derived from the grsecurity patch, although generated from scratch because it's simpler than extracting the changes from there. Signed-off-by: James Morris <jmorris@namei.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Acked-by: Casey Schaufler <casey@schaufler-ca.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'for-linus' of ↵Linus Torvalds2009-09-181-10/+16
|\ | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm: dlm: use kernel_sendpage dlm: fix connection close handling dlm: fix double-release of socket in error exit path
| * dlm: use kernel_sendpagePaolo Bonzini2009-08-241-5/+2Star
| | | | | | | | | | | | | | | | Using kernel_sendpage() is cleaner and safer than following sock->ops ourselves. Signed-off-by: Paolo Bonzini <bonzini@gnu.org> Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: fix connection close handlingLars Marowsky-Bree2009-08-241-2/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Closing a connection to a node can create problems if there are outstanding messages for that node. The problems include dlm_send spinning attempting to reconnect, or BUG from tcp_connect_to_sock() attempting to use a partially closed connection. To cleanly close a connection, we now first attempt to send any pending messages, cancel any remaining workqueue work, and flag the connection as closed to avoid reconnect attempts. Signed-off-by: Lars Marowsky-Bree <lmb@suse.de> Signed-off-by: Christine Caulfield <ccaulfie@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: fix double-release of socket in error exit pathCasey Dahlin2009-08-181-3/+1Star
| | | | | | | | | | | | | | | | | | | | The last correction to the tcp_connect_to_sock error exit path, commit a89d63a159b1ba5833be2bef00adf8ad8caac8be, can free an already freed socket, due to collision with a previous (incomplete) attempt to fix the same issue, commit 311f6fc77c51926dbdfbeab0a5d88d70f01fa3f4. Signed-off-by: Casey Dahlin <cdahlin@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* | Merge branch 'master' of ↵David S. Miller2009-08-133-9/+14
|\| | | | | | | | | | | | | master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: arch/microblaze/include/asm/socket.h
| * dlm: free socket in error exit pathCasey Dahlin2009-07-141-1/+3
| | | | | | | | | | | | | | | | In the tcp_connect_to_sock() error exit path, the socket allocated at the top of the function was not being freed. Signed-off-by: Casey Dahlin <cdahlin@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: fix plock use-after-freeDavid Teigland2009-06-181-7/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | Fix a regression from the original addition of nfs lock support 586759f03e2e9031ac5589912a51a909ed53c30a. When a synchronous (non-nfs) plock completes, the waiting thread will wake up and free the op struct. This races with the user thread in dev_write() which goes on to read the op's callback field to check if the lock is async and needs a callback. This check can happen on the freed op. The fix is to note the callback value before the op can be freed. Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: Fix uninitialised variable warning in lock.cSteven Whitehouse2009-06-171-1/+1
| | | | | | | | | | | | | | | | | | | | | | CC [M] fs/dlm/lock.o fs/dlm/lock.c: In function ‘find_rsb’: fs/dlm/lock.c:438: warning: ‘r’ may be used uninitialized in this function Since r is used on the error path to set r_ret, set it to NULL. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* | genetlink: make netns awareJohannes Berg2009-07-121-1/+1
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This makes generic netlink network namespace aware. No generic netlink families except for the controller family are made namespace aware, they need to be checked one by one and then set the family->netnsok member to true. A new function genlmsg_multicast_netns() is introduced to allow sending a multicast message in a given namespace, for example when it applies to an object that lives in that namespace, a new function genlmsg_multicast_allns() to send a message to all network namespaces (for objects that do not have an associated netns). The function genlmsg_multicast() is changed to multicast the message in just init_net, which is currently correct for all generic netlink families since they only work in init_net right now. Some will later want to work in all net namespaces because they do not care about the netns at all -- those will have to be converted to use one of the new functions genlmsg_multicast_allns() or genlmsg_multicast_netns() whenever they are made netns aware in some way. After this patch families can easily decide whether or not they should be available in all net namespaces. Many genl families us it for objects not related to networking and should therefore be available in all namespaces, but that will have to be done on a per family basis. Note that this doesn't touch on the checkpoint/restart problem where network namespaces could be used, genl families and multicast groups are numbered globally and I see no easy way of changing that, especially since it must be possible to multicast to all network namespaces for those families that do not care about netns. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* dlm: use more NOFS allocationDavid Teigland2009-05-154-11/+12
| | | | | | | | | Change some GFP_KERNEL allocations to use either GFP_NOFS or ls_allocation (when available) which the fs sets to GFP_NOFS. The point is to prevent allocations from going back into the cluster fs in places where that might lead to deadlock. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: connect to nodes earlierChristine Caulfield2009-05-153-4/+26
| | | | | | | | | | Make network connections to other nodes earlier, in the context of dlm_recoverd. This avoids connecting to nodes from dlm_send where we try to avoid allocations which could possibly deadlock if memory reclaim goes into the cluster fs which may try to do a dlm operation. Signed-off-by: Christine Caulfield <ccaulfie@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: fix use count with multiple joinsDavid Teigland2009-05-071-7/+6Star
| | | | | | | | | When a lockspace was joined multiple times, the global dlm use count was incremented when it should not have been. This caused the global dlm threads to not be stopped when all lockspaces were eventually be removed. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: Make name input parameter of {,dlm_}new_lockspace() constGeert Uytterhoeven2009-05-071-2/+2
| | | | | | | | fs/gfs2/lock_dlm.c:207: warning: passing argument 1 of 'dlm_new_lockspace' discards qualifiers from pointer target type Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: fix length calculation in compat codeDavid Teigland2009-03-111-9/+15
| | | | | | | | | | | | | Using offsetof() to calculate name length does not work because it does not produce consistent results with with structure packing. This caused memcpy to corrupt memory by copying 4 extra bytes off the end of the buffer on 64 bit kernels with 32 bit userspace (the only case where this 32/64 compat code is used). The fix is to calculate name length directly from the start instead of trying to derive it later using count and offsetof. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: ignore cancel on granted lockDavid Teigland2009-03-111-0/+7
| | | | | | | Return immediately from dlm_unlock(CANCEL) if the lock is granted and not being converted; there's nothing to cancel. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: clear defunct cancel stateDavid Teigland2009-03-111-8/+45
| | | | | | | | | | | | When a conversion completes successfully and finds that a cancel of the convert is still in progress (which is now a moot point), preemptively clear the state associated with outstanding cancel. That state could cause a subsequent conversion to be ignored. Also, improve the consistency and content of error and debug messages in this area. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: replace idr with hash table for connectionsChristine Caulfield2009-03-111-79/+92
| | | | | | | | Integer nodeids can be too large for the idr code; use a hash table instead. Signed-off-by: Christine Caulfield <ccaulfie@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: comment typo fixesJoe Perches2009-01-281-3/+3
| | | | | Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: use ipv6_addr_copyJoe Perches2009-01-281-2/+2
| | | | | Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: Change rwlock which is only used in write mode to a spinlockSteven Whitehouse2009-01-283-11/+11
| | | | | | | | The ls_dirtbl[].lock was an rwlock, but since it was only used in write mode a spinlock will suffice. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: initialize file_lock struct in GETLK before copying conflicting lockJeff Layton2009-01-211-0/+2
| | | | | | | | | | | | | | | | | dlm_posix_get fills out the relevant fields in the file_lock before returning when there is a lock conflict, but doesn't clean out any of the other fields in the file_lock. When nfsd does a NFSv4 lockt call, it sets the fl_lmops to nfsd_posix_mng_ops before calling the lower fs. When the lock comes back after testing a lock on GFS2, it still has that field set. This confuses nfsd into thinking that the file_lock is a nfsd4 lock. Fix this by making DLM reinitialize the file_lock before copying the fields from the conflicting lock. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: fix plock notify callback to lockdDavid Teigland2009-01-211-2/+2
| | | | | | | | | We should use the original copy of the file_lock, fl, instead of the copy, flc in the lockd notify callback. The range in flc has been modified by posix_lock_file(), so it will not match a copy of the lock in lockd. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: change rsbtbl rwlock to spinlockDavid Teigland2009-01-085-32/+32
| | | | | | | The rwlock is almost always used in write mode, so there's no reason to not use a spinlock instead. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: fix seq_file usage in debugfs lock dumpDavid Teigland2009-01-081-359/+337Star
| | | | | | | | | | | The old code would leak iterators and leave reference counts on rsbs because it was ignoring the "stop" seq callback. The code followed an example that used the seq operations differently. This new code is based on actually understanding how the seq operations work. It also improves things by saving the hash bucket in the position to avoid cycling through completed buckets in start. Siged-off-by: Davd Teigland <teigland@redhat.com>
* Merge branch 'for-linus' of ↵Linus Torvalds2009-01-0612-130/+316
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm: dlm: fs/dlm/ast.c: fix warning dlm: add new debugfs entry dlm: add time stamp of blocking callback dlm: change lock time stamping dlm: improve how bast mode handling dlm: remove extra blocking callback check dlm: replace schedule with cond_resched dlm: remove kmap/kunmap dlm: trivial annotation of be16 value dlm: fix up memory allocation flags
| * dlm: fs/dlm/ast.c: fix warningAndrew Morton2008-12-231-22/+17Star
| | | | | | | | | | | | | | | | | | | | fs/dlm/ast.c: In function 'dlm_astd': fs/dlm/ast.c:64: warning: 'bastmode' may be used uninitialized in this function Cleans code up. Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: add new debugfs entryDavid Teigland2008-12-232-50/+247
| | | | | | | | | | | | | | | | | | The new debugfs entry dumps all rsb and lkb structures, and includes a lot more information than has been available before. This includes the new timestamps added by a previous patch for debugging callback issues. Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: add time stamp of blocking callbackDavid Teigland2008-12-232-0/+3
| | | | | | | | | | | | | | | | Record the time the latest blocking callback was queued for a lock. This will be used for debugging in combination with lock queue timestamp changes in the previous patch. Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: change lock time stampingDavid Teigland2008-12-234-19/+19
| | | | | | | | | | | | | | | | | | Use ktime instead of jiffies for timestamping lkb's. Also stamp the time on every lkb whenever it's added to a resource queue, instead of just stamping locks subject to timeouts. This will allow us to use timestamps more widely for debugging all locks. Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: improve how bast mode handlingDavid Teigland2008-12-235-15/+17
| | | | | | | | | | | | | | | | | | | | | | The lkb bastmode value is set in the context of processing the lock, and read by the dlm_astd thread. Because it's accessed in these two separate contexts, the writing/reading ought to be done under a lock. This is simple to do by setting it and reading it when the lkb is added to and removed from dlm_astd's callback list which is properly locked. Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: remove extra blocking callback checkDavid Teigland2008-12-231-6/+1Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Just before delivering a blocking callback (bast), the dlm_astd thread checks again that the granted mode of the lkb actually blocks the mode requested by the bast. The idea behind this was originally that the granted mode may have changed since the bast was queued, making the callback now unnecessary. Reasons for removing this extra check are: - dlm_astd doesn't lock the rsb before reading the lkb grmode, so it's not technically safe (this removes the long standing FIXME) - after running some tests, it doesn't appear the check ever actually eliminates a bast - delivering an unnecessary blocking callback isn't a bad thing and can happen anyway Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: replace schedule with cond_reschedSteven Whitehouse2008-12-231-1/+1
| | | | | | | | | | | | | | | | | | | | This is a one-liner to use cond_resched() rather than schedule() in the ast delivery loop. It should not be necessary to schedule every time, so this will save some cpu time while continuing to allow scheduling when required. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: remove kmap/kunmapSteven Whitehouse2008-12-231-7/+0Star
| | | | | | | | | | | | | | | | The pages used in lowcomms are not highmem, so kmap is not necessary. Cc: Christine Caulfield <ccaulfie@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: trivial annotation of be16 valueHarvey Harrison2008-12-231-9/+9
| | | | | | | | | | | | | | | | | | fs/dlm/dir.c:419:14: warning: incorrect type in assignment (different base types) fs/dlm/dir.c:419:14: expected unsigned short [unsigned] [addressable] [assigned] [usertype] be_namelen fs/dlm/dir.c:419:14: got restricted __be16 [usertype] <noident> Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: fix up memory allocation flagsSteven Whitehouse2008-12-233-4/+5
| | | | | | | | | | | | | | | | | | | | | | Use ls_allocation for memory allocations, which a cluster fs sets to GFP_NOFS. Use GFP_NOFS for allocations when no lockspace struct is available. Taking dlm locks needs to avoid calling back into the cluster fs because write-out can require taking dlm locks. Cc: Christine Caulfield <ccaulfie@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
* | fix warning in fs/dlm/netlink.cIngo Molnar2008-11-261-1/+1
|/ | | | | | | | | | | | | | | this warning: fs/dlm/netlink.c: In function ‘dlm_timeout_warn’: fs/dlm/netlink.c:131: warning: ‘send_skb’ may be used uninitialized in this function triggers because GCC does not recognize the (correct) error flow between prepare_data() and send_skb. Annotate it. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: David S. Miller <davem@davemloft.net>
* dlm: fix shutdown cleanupDavid Teigland2008-11-131-1/+1
| | | | | | | | | | | | | | | Fixes a regression from commit 0f8e0d9a317406612700426fad3efab0b7bbc467, "dlm: allow multiple lockspace creates". An extraneous 'else' slipped into a code fragment being moved from release_lockspace() to dlm_release_lockspace(). The result of the unwanted 'else' is that dlm threads and structures are not stopped and cleaned up when the final dlm lockspace is removed. Trying to create a new lockspace again afterward will fail with "kmem_cache_create: duplicate cache dlm_conn" because the cache was not previously destroyed. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: choose better identifiersAndrew Morton2008-09-051-22/+22
| | | | | | | | | | | | | | | | | | | | | | sparc32: fs/dlm/config.c:397: error: expected identifier or '(' before '{' token fs/dlm/config.c: In function 'drop_node': fs/dlm/config.c:589: warning: initialization from incompatible pointer type fs/dlm/config.c:589: warning: initialization from incompatible pointer type fs/dlm/config.c: In function 'release_node': fs/dlm/config.c:601: warning: initialization from incompatible pointer type fs/dlm/config.c:601: warning: initialization from incompatible pointer type fs/dlm/config.c: In function 'show_node': fs/dlm/config.c:717: warning: initialization from incompatible pointer type fs/dlm/config.c:717: warning: initialization from incompatible pointer type fs/dlm/config.c: In function 'store_node': fs/dlm/config.c:726: warning: initialization from incompatible pointer type fs/dlm/config.c:726: warning: initialization from incompatible pointer type Cc: Christine Caulfield <ccaulfie@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: remove bklDavid Teigland2008-09-041-8/+1Star
| | | | | | BLK from recent pushdown is not needed. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: fix address compareDavid Teigland2008-09-021-2/+31
| | | | | | | Compare only the addr and port fields of sockaddr structures. Fixes a problem with ipv6 where sin6_scope_id does not match. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: fix locking of lockspace list in dlm_scandDavid Teigland2008-08-282-2/+26
| | | | | | | The dlm_scand thread needs to lock the list of lockspaces when going through it. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: detect available userspace daemonDavid Teigland2008-08-284-2/+85
| | | | | | | | | | | | | | | If dlm_controld (the userspace daemon that controls the setup and recovery of the dlm) fails, the kernel should shut down the lockspaces in the kernel rather than leaving them running. This is detected by having dlm_controld hold a misc device open while running, and if the kernel detects a close while the daemon is still needed, it stops the lockspaces in the kernel. Knowing that the userspace daemon isn't running also allows the lockspace create/remove routines to avoid waiting on the daemon for join/leave operations. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: allow multiple lockspace createsDavid Teigland2008-08-284-61/+109
| | | | | | | | | | Add a count for lockspace create and release so that create can be called multiple times to use the lockspace from different places. Also add the new flag DLM_LSFL_NEWEXCL to create a lockspace with the previous behavior of returning -EEXIST if the lockspace already exists. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: rename structsDavid Teigland2008-08-131-96/+107
| | | | | | | | | Add a dlm_ prefix to the struct names in config.c. This resolves a conflict with struct node in particular, when include/linux/node.h happens to be included. Reported-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: add missing kfreesDavid Teigland2008-08-131-3/+7
| | | | | | | | A couple of unlikely error conditions were missing a kfree on the error exit path. Reported-by: Juha Leppanen <juha_motorsportcom@luukku.com> Signed-off-by: David Teigland <teigland@redhat.com>
* Merge branch 'for-linus' of ↵Linus Torvalds2008-07-283-3/+7
|\ | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm: dlm: fix uninitialized variable for search_rsb_list callers dlm: release socket on error dlm: fix basts for granted CW waiting PR/CW dlm: check for null in device_write
| * dlm: fix uninitialized variable for search_rsb_list callersBenny Halevy2008-07-141-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | gcc 4.3.0 correctly emits the following warning. search_rsb_list does not *r_ret if no dlm_rsb is found and _search_rsb may pass the uninitialized value upstream on the error path when both calls to search_rsb_list return non-zero error. The fix sets *r_ret to NULL on search_rsb_list's not-found path. Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: release socket on errorMasatake YAMATO2008-07-141-1/+3
| | | | | | | | | | | | | | | | | | | | It seems that `sock' allocated by sock_create_kern in tcp_connect_to_sock() of dlm/fs/lowcomms.c is not released if dlm_nodeid_to_addr an error. Acked-by: Christine Caulfield <ccaulfie@redhat.com> Signed-off-by: Masatake YAMATO <yamato@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
| * dlm: fix basts for granted CW waiting PR/CWDavid Teigland2008-07-141-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | The fix in commit 3650925893469ccb03dbcc6a440c5d363350f591 was addressing the case of a granted PR lock with waiting PR and CW locks. It's a special case that requires forcing a CW bast. However, that forced CW bast was incorrectly applying to a second condition where the granted lock was CW. So, the holder of a CW lock could receive an extraneous CW bast instead of a PR bast. This fix narrows the original special case to what was intended. Signed-off-by: David Teigland <teigland@redhat.com>
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