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* [PATCH] r/o bind mounts: elevate write count for ioctls()Dave Hansen2008-04-191-5/+6
| | | | | | | | | | | | | Some ioctl()s can cause writes to the filesystem. Take these, and make them use mnt_want/drop_write() instead. [AV: updated] Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* ocfs2/net: Add debug interface to o2netSunil Mushran2008-04-186-3/+569
| | | | | | | | | | | | | | | This patch exposes o2net information via debugfs. The information includes the list of sockets (sock_containers) as well as the list of outstanding messages (send_tracking). Useful for o2dlm debugging. (This patch is derived from an earlier one written by Zach Brown that exposed the same information via /proc.) [Mark: checkpatch fixes] Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Reviewed-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Only build ocfs2/dlm with the o2cb stack moduleMark Fasheh2008-04-181-1/+1
| | | | | | | | | | | fs/ocfs2/dlm/ocfs2_dlm.ko and fs/ocfs2/dlm/ocfs2_dlmfs.ko get built if CONFIG_FS_OCFS2 is specified. This isn't quite how it should happen any more - the "o2cb" dlm modules should only be built if CONFIG_FS_OCFS2_O2CB is set, so update the dlm Makefile accordingly. Signed-off-by: Mark Fasheh <mfasheh@suse.com> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Acked-by: Joel Becker <joel.becker@oracle.com>
* ocfs2/cluster: Get rid of arguments to the timeout routinesJeff Mahoney2008-04-181-27/+20
| | | | | | | | | | | | | We keep seeing bug reports related to NULL pointer derefs in o2net_set_nn_state(). When I originally wrote up the configurable timeout patch, I had tried to plan for multiple clusters. This was silly. The timeout routines all use o2nm_single_cluster so there's no point in passing an argument at all. This patch removes the arguments and kills those bugs dead. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Use BUG_ONJulia Lawall2008-04-182-4/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | if (...) BUG(); should be replaced with BUG_ON(...) when the test has no side-effects to allow a definition of BUG_ON that drops the code completely. The semantic patch that makes this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @ disable unlikely @ expression E,f; @@ ( if (<... f(...) ...>) { BUG(); } | - if (unlikely(E)) { BUG(); } + BUG_ON(E); ) @@ expression E,f; @@ ( if (<... f(...) ...>) { BUG(); } | - if (E) { BUG(); } + BUG_ON(E); ) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Convert ocfs2 over to unlocked_ioctlAndi Kleen2008-04-183-13/+6
| | | | | | | | As far as I can see there is nothing in ocfs2_ioctl that requires the BKL, so use unlocked_ioctl Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Improve rename lockingJan Kara2008-04-181-1/+1
| | | | | | | | ocfs2_rename() was being too aggressive with the rename lock - we only need it for certain forms of directory rename. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* fs/ocfs2/aops.c: test for IS_ERR rather than 0Julia Lawall2008-04-181-3/+3
| | | | | | | | | | The function ocfs2_start_trans always returns either a valid pointer or a value made with ERR_PTR, so its result should be tested with IS_ERR, not with a test for 0. Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Add inode stealing for ocfs2_reserve_new_inodeTao Ma2008-04-186-5/+116
| | | | | | | | | | Inode allocation is modified to look in other nodes allocators during extreme out of space situations. We retry our own slot when space is freed back to the global bitmap, or whenever we've allocated more than 1024 inodes from another slot. Signed-off-by: Tao Ma <tao.ma@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Add ac_alloc_slot in ocfs2_alloc_contextTao Ma2008-04-183-0/+4
| | | | | | | | | | | | In inode stealing, we no longer restrict the allocation to happen in the local node. So it is neccessary for us to add a new member in ocfs2_alloc_context to indicate which slot we are using for allocation. We also modify the process of local alloc so that this member can be used there also. Signed-off-by: Tao Ma <tao.ma@oracle.com> Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Add a new parameter for ocfs2_reserve_suballoc_bitsTao Ma2008-04-181-4/+18
| | | | | | | | | | | In some cases(Inode stealing from other nodes), we may not want ocfs2_reserve_suballoc_bits to allocate new groups from the global_bitmap since it may already be full. So add a new parameter for this. Signed-off-by: Tao Ma <tao.ma@oracle.com> Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Enable cross extent block merge.Tao Ma2008-04-181-8/+86
| | | | | | | | | In ocfs2_figure_merge_contig_type, we judge whether there exists a cross extent block merge and enable it by setting CONTIG_LEFT and CONTIG_RIGHT accordingly. Signed-off-by: Tao Ma <tao.ma@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Add support for cross extent blockTao Ma2008-04-181-41/+325
| | | | | | | | | | | | | | | | | In ocfs2_merge_rec_left, when we find the merge extent is "CONTIG_RIGHT" with the first extent record of the next extent block, we will merge it to the next extent block and change all the related extent blocks accordingly. In ocfs2_merge_rec_right, when we find the merge extent is "CONTIG_LEFT" with the last extent record of the previous extent block, we will merge it to the prevoius extent block and change all the related extent blocks accordingly. As for CONTIG_LEFTRIGHT, we will handle CONTIG_RIGHT first so that when the index is zero, the merge process will be more efficient and easier. Signed-off-by: Tao Ma <tao.ma@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Move /sys/o2cb to /sys/fs/o2cbMark Fasheh2008-04-181-0/+9
| | | | | | | | | | | | /sys/fs is where we really want file system specific sysfs objects. Ocfs2-tools has been updated to look in /sys/fs/o2cb. We can maintain backwards compatibility with old ocfs2-tools by using a sysfs symlink. After some time (2 years), the symlink can be safely removed. This patch also adds documentation to make it easier for people to figure out what /sys/fs/o2cb is used for. Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Reconnect after idle time out.Tao Ma2008-04-182-15/+38
| | | | | | | | | | | | | | | | | | | | | | Currently, o2net connects to a node on hb_up and disconnects on hb_down and net timeout. It disconnects on net timeout is ok, but it should attempt to reconnect back. This is because sometimes nodes get overloaded enough that the network connection breaks but the disk hb does not. And if we get into that situation, we either fence (unnecessarily) or wait for its disk hb to die (and sometimes hang in the process). So in this updated scheme, when the network disconnects, we keep attempting to reconnect till we succeed or we get a disk hb down event. If the other node is really dead, then we will eventually get a node down event. If not, we should be able to connect again and continue. Signed-off-by: Tao Ma <tao.ma@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2/dlm: Cleanup lockres printSunil Mushran2008-04-181-11/+11
| | | | | | | | | | A previous patch added KERN_NOTICE to printks printing the lockres that cluttered the output. This patch removes the log level. For people concerned with syslog clutter, please note we now use this facility to print lockres only during an error. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2/dlm: Fix lockname in lockres print functionSunil Mushran2008-04-181-75/+51
| | | | | | | | | | __dlm_print_one_lock_resource was printing lockname incorrectly. Also, we now use printk directly instead of mlog as the latter prints the line context which is not useful for this print. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2/dlm: Move dlm_print_one_mle() from dlmmaster.c to dlmdebug.cSunil Mushran2008-04-183-160/+85
| | | | | | | | This patch helps in consolidating debugging related functions in dlmdebug.c. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2/dlm: Dumps the purgelist into a debugfs fileSunil Mushran2008-04-182-0/+72
| | | | | | | | | This patch dumps all the lockres' on the purgelist it can fit in one page into a debugfs file. Useful for debugging. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2/dlm: Dumps the mles into a debugfs fileSunil Mushran2008-04-182-0/+120
| | | | | | | | | This patch dumps all mles it can fit in one page into a debugfs file. Useful for debugging. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2/dlm: Move struct dlm_master_list_entry to dlmcommon.hSunil Mushran2008-04-182-37/+35
| | | | | | | | | | This patch moves some mle related definitions from dlmmaster.c to dlmcommon.h. Future patches need these definitions to dump mle debugging information. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Joel Becker <joel.beckeroracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2/dlm: Dumps the lockres' into a debugfs fileSunil Mushran2008-04-182-0/+255
| | | | | | | | | This patch dumps all the lockres' alongwith all the locks into a debugfs file. Useful for debugging. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2/dlm: Dump the dlm state in a debugfs fileSunil Mushran2008-04-184-0/+325
| | | | | | | | | This patch dumps the dlm state (dlm_ctxt) into a debugfs file. Useful for debugging. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2/dlm: Create debugfs dirsSunil Mushran2008-04-184-2/+125
| | | | | | | | | This patch creates the debugfs directories that will hold the files to be used to dump the dlm state. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2/dlm: Link all lockres' to a tracking listSunil Mushran2008-04-183-0/+26
| | | | | | | | | | This patch links all the lockres' to a tracking list in dlm_ctxt. We will use this in an upcoming patch that will walk the entire list and to dump the lockres states to a debugfs file. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2/dlm: Create slabcaches for lock and lockresSunil Mushran2008-04-184-17/+99
| | | | | | | | | | | This patch makes the o2dlm allocate memory for lockres, lockname and lock structures from slabcaches rather than kmalloc. This allows us to not only make these allocs more efficient but also allows us to track the memory being consumed by these structures. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2/dlm: Rename slabcache dlm_mle_cache to o2dlm_mleSunil Mushran2008-04-182-2/+4
| | | | | | | | This patch renames dlm_mle_slabcache to prevent namespace clashes with fs/dlm. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Allow selection of cluster plug-ins.Joel Becker2008-04-181-4/+6
| | | | | | | | | | | | ocfs2 now supports plug-ins for the classic O2CB stack as well as userspace cluster stacks in conjunction with fs/dlm. This allows zero, one, or both of the plug-ins to be selected in Kconfig. For local mounts (non-clustered), neither plug-in is needed. Both plugins can be loaded at one time, the runtime will select the one needed for the cluster systme in use. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Add kbuild for ocfs2_stack_user.koJoel Becker2008-04-181-1/+6
| | | | | | | Add ocfs2_stack_user.ko to the Makefile so that it builds. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Change mlog_bug_on to BUG_ON in ocfs2_lockid.hJoel Becker2008-04-181-1/+1
| | | | | | | | | The masklog code is in the o2cb stack, but ocfs2_lockid.h now needs to be included by the user stack. The BUG() in ocfs2_lock_type_string() does not need masklog support, so change it to a regular BUG_ON(). Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: add fsdlm to stackglueDavid Teigland2008-04-183-6/+243
| | | | | | | | | | Add code to use fs/dlm. [ Modified to be part of the stack_user module -- Joel ] Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Add the 'set version' message to the ocfs2_control device.Joel Becker2008-04-181-12/+119
| | | | | | | | | The "SETV" message sets the filesystem locking protocol version as negotiated by the client. The client negotiates based on the maximum version advertised in /sys/fs/ocfs2/max_locking_protocol. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Add the local node id to the handshake.Joel Becker2008-04-181-49/+173
| | | | | | | | | This is the second part of the ocfs2_control handshake. After negotiating the ocfs2_control protocol, the daemon tells the filesystem what the local node id is via the SETN message. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Introduce the DOWN message to ocfs2_controlJoel Becker2008-04-181-5/+89
| | | | | | | | When the control daemon sees a node go down, it sends a DOWN message through the ocfs2_control device. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Start the ocfs2_control handshake.Joel Becker2008-04-181-5/+139
| | | | | | | | | | | | | When a control daemon opens the ocfs2_control device, it must perform a handshake to tell the filesystem it is something capable of monitoring cluster status. Only after the handshake is complete will the filesystem allow mounts. This is the first part of the handshake. The daemon reads all supported ocfs2_control protocols, then writes in the protocol it will use. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Add the ocfs2_control misc device.Joel Becker2008-04-181-1/+183
| | | | | | | | The ocfs2_control misc device is how a userspace control daemon (controld) talks to the filesystem. Introduce the bare-bones filesystem ops. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Add the user stack module.Joel Becker2008-04-181-0/+38
| | | | | | | | Add a skeleton for the stack_user module. It's just the barebones module code. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Add the 'cluster_stack' sysfs file.Joel Becker2008-04-183-13/+104
| | | | | | | | | | | | | | | | | | Userspace can now query and specify the cluster stack in use via the /sys/fs/ocfs2/cluster_stack file. By default, it is 'o2cb', which is the classic stack. Thus, old tools that do not know how to modify this file will work just fine. The stack cannot be modified if there is a live filesystem. ocfs2_cluster_connect() now takes the expected cluster stack as an argument. This way, the filesystem and the stack glue ensure they are speaking to the same backend. If the stack is 'o2cb', the o2cb stack plugin is used. For any other value, the fsdlm stack plugin is selected. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Add the USERSPACE_STACK incompat bit.Joel Becker2008-04-183-3/+134
| | | | | | | | | | | | | | | | | | The filesystem gains the USERSPACE_STACK incomat bit and the s_cluster_info field on the superblock. When a userspace stack is in use, the name of the stack is stored on-disk for mount-time verification. The "cluster_stack" option is added to mount(2) processing. The mount process needs to pass the matching stack name. If the passed name and the on-disk name do not match, the mount is failed. When using the classic o2cb stack, the incompat bit is *not* set and no mount option is used other than the usual heartbeat=local. Thus, the filesystem is compatible with older tools. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Create stack glue sysfs files.Joel Becker2008-04-181-1/+120
| | | | | | | | | | | | Introduce a set of sysfs files that describe the current stack glue state. The files live under /sys/fs/ocfs2. The locking_protocol file displays the version of ocfs2's locking code. The loaded_cluster_plugins file displays all of the currently loaded stack plugins. When filesystems are mounted, the active_cluster_plugin file will display the plugin in use. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Break out stackglue into modules.Joel Becker2008-04-187-50/+297
| | | | | | | | | | | | | | | | | | We define the ocfs2_stack_plugin structure to represent a stack driver. The o2cb stack code is split into stack_o2cb.c. This becomes the ocfs2_stack_o2cb.ko module. The stackglue generic functions are similarly split into the ocfs2_stackglue.ko module. This module now provides an interface to register drivers. The ocfs2_stack_o2cb driver registers itself. As part of this interface, ocfs2_stackglue can load drivers on demand. This is accomplished in ocfs2_cluster_connect(). ocfs2_cluster_disconnect() is now notified when a _hangup() is pending. If a hangup is pending, it will not release the driver module and will let _hangup() do that. Signed-off-by: Joel Becker <joel.becker@oracle.com>
* ocfs2: Create ocfs2_stack_operations and split out the o2cb stack.Joel Becker2008-04-184-372/+532
| | | | | | | | | | | | | | | Define the ocfs2_stack_operations structure. Build o2cb_stack_ops from all of the o2cb-specific stack functions. Change the generic stack glue functions to call the stack_ops instead of the o2cb functions directly. The o2cb functions are moved to stack_o2cb.c. The headers are cleaned up to where only needed headers are included. In this code, stackglue.c and stack_o2cb.c refer to some shared extern variables. When they become modules, that will change. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Split o2cb code from generic stack functions.Joel Becker2008-04-181-65/+144
| | | | | | | | | Split off the o2cb-specific funtionality from the generic stack glue calls. This is a precurser to wrapping the o2cb functionality in an operations vector. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Clean up stackglue initializationJoel Becker2008-04-185-22/+9
| | | | | | | | The stack glue initialization function needs a better name so that it can be used cleanly when stackglue becomes a module. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Abstract out a debugging function for underlying dlms.Joel Becker2008-04-183-2/+7
| | | | | | | | | | | dlmglue.c was still referencing a raw o2dlm lksb in one instance. Let's create a generic ocfs2_dlm_dump_lksb() function. This allows underlying DLMs to print whatever they want about their lock. We then move the o2dlm dump into stackglue.c where it belongs. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: handle async EAGAIN from NOQUEUE requestDavid Teigland2008-04-181-4/+23
| | | | | | | | | When using fsdlm, -EAGAIN is returned in the async callback for NOQUEUE requests. Fix up dlmglue to expect this. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Remove CANCELGRANT from the view of dlmglue.Joel Becker2008-04-183-55/+188
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | o2dlm has the non-standard behavior of providing a cancel callback (unlock_ast) even when the cancel has failed (the locking operation succeeded without canceling). This is called CANCELGRANT after the status code sent to the callback. fs/dlm does not provide this callback, so dlmglue must be changed to live without it. o2dlm_unlock_ast_wrapper() in stackglue now ignores CANCELGRANT calls. Because dlmglue no longer sees CANCELGRANT, ocfs2_unlock_ast() no longer needs to check for it. ocfs2_locking_ast() must catch that a cancel was tried and clear the cancel state. Making these changes opens up a locking race. dlmglue uses the the OCFS2_LOCK_BUSY flag to ensure only one thread is calling the dlm at any one time. But dlmglue must unlock the lockres before calling into the dlm. In the small window of time between unlocking the lockres and calling the dlm, the downconvert thread can try to cancel the lock. The downconvert thread is checking the OCFS2_LOCK_BUSY flag - it doesn't know that ocfs2_dlm_lock() has not yet been called. Because ocfs2_dlm_lock() has not yet been called, the cancel operation will just be a no-op. There's nothing to cancel. With CANCELGRANT, dlmglue uses the CANCELGRANT callback to clear up the cancel state. When it comes around again, it will retry the cancel. Eventually, the first thread will have called into ocfs2_dlm_lock(), and either the lock or the cancel will succeed. The downconvert thread can then do its downconvert. Without CANCELGRANT, there is nothing to clean up the cancellation state. The downconvert thread does not know to retry its operations. More importantly, the original lock may be blocking on the other node that is trying to cancel us. With neither able to make progress, the ast is never called and the cancellation state is never cleaned up that way. dlmglue is deadlocked. The OCFS2_LOCK_PENDING flag is introduced to remedy this window. It is set at the same time OCFS2_LOCK_BUSY is. Thus, the downconvert thread can check whether the lock is cancelable. If not, it just loops around to try again. Once ocfs2_dlm_lock() is called, the thread then clears OCFS2_LOCK_PENDING and wakes the downconvert thread. Now, if the downconvert thread finds the lock BUSY, it can safely try to cancel it. Whether the cancel works or not, the state will be properly set and the lock processing can continue. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Fill node number during cluster stack initMark Fasheh2008-04-182-34/+12
| | | | | | | | | | | | | It doesn't make sense to query for a node number before connecting to the cluster stack. This should be safe to do because node_num is only just printed, and we're actually only moving the setting of node num a small amount further in the mount process. [ Disconnect when node query fails -- Joel ] Reviewed-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Move o2hb functionality into the stack glue.Joel Becker2008-04-188-55/+62
| | | | | | | | | | | | | | | | | The last bit of classic stack used directly in ocfs2 code is o2hb. Specifically, the check for heartbeat during mount and the call to ocfs2_hb_ctl during unmount. We create an extra API, ocfs2_cluster_hangup(), to encapsulate the call to ocfs2_hb_ctl. Other stacks will just leave hangup() empty. The check for heartbeat is moved into ocfs2_cluster_connect(). It will be matched by a similar check for other stacks. With this change, only stackglue.c includes cluster/ headers. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
* ocfs2: Abstract out node number queries.Joel Becker2008-04-185-14/+30
| | | | | | | | | | | | | | | | | ocfs2 asks the cluster stack for the local node's node number for two reasons; to fill the slot map and to print it. While the slot map isn't necessary for userspace cluster stacks, the printing is very nice for debugging. Thus we add ocfs2_cluster_this_node() as a generic API to get this value. It is anticipated that the slot map will not be used under a userspace cluster stack, so validity checks of the node num only need to exist in the slot map code. Otherwise, it just gets used and printed as an opaque value. [ Fixed up some "int" versus "unsigned int" issues and made osb->node_num truly opaque. --Mark ] Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
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