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* dlm: record full callback stateDavid Teigland2011-03-101-2/+2
| | | | | | | | | | | | | Change how callbacks are recorded for locks. Previously, information about multiple callbacks was combined into a couple of variables that indicated what the end result should be. In some situations, we could not tell from this combined state what the exact sequence of callbacks were, and would end up either delivering the callbacks in the wrong order, or suppress redundant callbacks incorrectly. This new approach records all the data for each callback, leaving no uncertainty about what needs to be delivered. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: always use GFP_NOFSDavid Teigland2009-11-301-1/+1
| | | | | | | | | | | | | | Replace all GFP_KERNEL and ls_allocation with GFP_NOFS. ls_allocation would be GFP_KERNEL for userland lockspaces and GFP_NOFS for file system lockspaces. It was discovered that any lockspaces on the system can affect all others by triggering memory reclaim in the file system which could in turn call back into the dlm to acquire locks, deadlocking dlm threads that were shared by all lockspaces, like dlm_recv. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: fix rcom_names message to selfDavid Teigland2008-02-211-0/+2
| | | | | | | | | The recent patch to validate data lengths in rcom_names messages failed to account for fake messages a node directs to itself before ever sending it. In this case we need to fill in the message length in the header for the validation code to use. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: proper types for asts and bastsDavid Teigland2008-02-061-2/+2
| | | | | | | Use proper types for ast and bast functions, and use consistent type for ast param. Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: verify that places expecting rcom_lock have packet long enoughAl Viro2008-02-041-1/+11
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: missing length check in check_config()Al Viro2008-02-041-0/+7
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: use proper type for ->ls_recover_bufAl Viro2008-02-041-5/+6
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: do not byteswap rcom_configAl Viro2008-02-041-7/+8
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: do not byteswap rcom_lockAl Viro2008-02-041-7/+7
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David Teigland <teigland@redhat.com>
* dlm: clean upsDavid Teigland2008-01-301-20/+5
| | | | | | | | A couple small clean-ups. Remove unnecessary wrapper-functions in rcom.c, and remove unnecessary casting and an unnecessary ASSERT in util.c. Signed-off-by: David Teigland <teigland@redhat.com>
* [DLM] block dlm_recv in recovery transitionDavid Teigland2007-10-101-28/+8
| | | | | | | | | | | | | | | | | | | | | | | | Introduce a per-lockspace rwsem that's held in read mode by dlm_recv threads while working in the dlm. This allows dlm_recv activity to be suspended when the lockspace transitions to, from and between recovery cycles. The specific bug prompting this change is one where an in-progress recovery cycle is aborted by a new recovery cycle. While dlm_recv was processing a recovery message, the recovery cycle was aborted and dlm_recoverd began cleaning up. dlm_recv decremented recover_locks_count on an rsb after dlm_recoverd had reset it to zero. This is fixed by suspending dlm_recv (taking write lock on the rwsem) before aborting the current recovery. The transitions to/from normal and recovery modes are simplified by using this new ability to block dlm_recv. The switch from normal to recovery mode means dlm_recv goes from processing locking messages, to saving them for later, and vice versa. Races are avoided by blocking dlm_recv when setting the flag that switches between modes. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [DLM] fix NULL ls usageDavid Teigland2007-08-141-4/+3
| | | | | | | | Fix regression in recent patch "[DLM] variable allocation" which attempts to dereference an "ls" struct when it's NULL. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [DLM] variable allocationPatrick Caulfield2007-07-091-4/+5
| | | | | | | | | | Add a new flag, DLM_LSFL_FS, to be used when a file system creates a lockspace. This flag causes the dlm to use GFP_NOFS for allocations instead of GFP_KERNEL. (This updated version of the patch uses gfp_t for ls_allocation.) Signed-Off-By: Patrick Caulfield <pcaulfie@redhat.com> Signed-Off-By: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [DLM] wait for config check during join [6/6]David Teigland2007-07-091-2/+2
| | | | | | | | | | Joining the lockspace should wait for the initial round of inter-node config checks to complete before returning. This way, if there's a configuration mismatch between the joining node and the existing nodes, the join can fail and return an error to the application. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [DLM] rename dlm_config_info fieldsDavid Teigland2007-02-051-4/+4
| | | | | | | | | Add a "ci_" prefix to the fields in the dlm_config_info struct so that we can use macros to add configfs functions to access them (in a later patch). No functional changes in this patch, just naming changes. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [DLM] change some log_error to log_debugDavid Teigland2007-02-051-2/+2
| | | | | | | | Some common, non-error messages should use log_debug instead of log_error so they can be turned off. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [DLM] add version checkDavid Teigland2007-02-051-3/+11
| | | | | | | | Check if we receive a message from another lockspace member running a version of the dlm with an incompatible inter-node message protocol. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [DLM] fix old rcom messagesDavid Teigland2007-02-051-23/+38
| | | | | | | | | | | | | | | | | | | | | | | | | | | A reply to a recovery message will often be received after the relevant recovery sequence has aborted and the next recovery sequence has begun. We need to ignore replies to these old messages from the previous recovery. There's already a way to do this for synchronous recovery requests using the rc_id number, but not for async. Each recovery sequence already has a locally unique sequence number associated with it. This patch adds a field to the rcom (recovery message) structure where this recovery sequence number can be placed, rc_seq. When a node sends a reply to a recovery request, it copies the rc_seq number it received into rc_seq_reply. When the first node receives the reply to its recovery message, it will check whether rc_seq_reply matches the current recovery sequence number, ls_recover_seq, and if not then it ignores the old reply. An old, inadequate approach to filtering out old replies (checking if the current stage of recovery has moved back to the start) has been removed from two spots. The protocol version number is changed to reflect the different rcom structures. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [DLM] fix format warnings in rcom.c and recoverd.cRyusuke Konishi2006-11-301-1/+2
| | | | | | | | | | | | | | | This fixes the following gcc warnings generated on the architectures where uint64_t != unsigned long long (e.g. ppc64). fs/dlm/rcom.c:154: warning: format '%llx' expects type 'long long unsigned int', but argument 4 has type 'uint64_t' fs/dlm/rcom.c:154: warning: format '%llx' expects type 'long long unsigned int', but argument 5 has type 'uint64_t' fs/dlm/recoverd.c:48: warning: format '%llx' expects type 'long long unsigned int', but argument 3 has type 'uint64_t' fs/dlm/recoverd.c:202: warning: format '%llx' expects type 'long long unsigned int', but argument 3 has type 'uint64_t' fs/dlm/recoverd.c:210: warning: format '%llx' expects type 'long long unsigned int', but argument 3 has type 'uint64_t' Signed-off-by: Ryusuke Konishi <ryusuke@osrg.net> Signed-off-by: Patrick Caulfield <pcaulfie@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [DLM] don't accept replies to old recovery messagesDavid Teigland2006-11-301-10/+34
| | | | | | | | | | | | | | | | | | | | | | | We often abort a recovery after sending a status request to a remote node. We want to ignore any potential status reply we get from the remote node. If we get one of these unwanted replies, we've often moved on to the next recovery message and incremented the message sequence counter, so the reply will be ignored due to the seq number. In some cases, we've not moved on to the next message so the seq number of the reply we want to ignore is still correct, causing the reply to be accepted. The next recovery message will then mistake this old reply as a new one. To fix this, we add the flag RCOM_WAIT to indicate when we can accept a new reply. We clear this flag if we abort recovery while waiting for a reply. Before the flag is set again (to allow new replies) we know that any old replies will be rejected due to their sequence number. We also initialize the recovery-message sequence number to a random value when a lockspace is first created. This makes it clear when messages are being rejected from an old instance of a lockspace that has since been recreated. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [DLM] fix size of STATUS_REPLY messageDavid Teigland2006-11-301-1/+5
| | | | | | | | | | | When the not_ready routine sends a "fake" status reply with blank status flags, it needs to use the correct size for a normal STATUS_REPLY by including the size of the would-be config parameters. We also fill in the non-existant config parameters with an invalid lvblen value so it's easier to notice if these invalid paratmers are ever being used. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [DLM] status messages ping-pong between unmounted nodesDavid Teigland2006-11-301-3/+4
| | | | | | | | | | | | | | Red Hat BZ 213682 If two nodes leave the lockspace (while unmounting the fs in the case of gfs) after one has sent a STATUS message to the other, STATUS/STATUS_REPLY messages will then ping-pong between the nodes when neither of them can find the lockspace in question any longer. We kill this by not sending another STATUS message when we get a STATUS_REPLY for an unknown lockspace. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [DLM] sequence number missing in not_ready replyDavid Teigland2006-08-241-0/+1
| | | | | | | | | | When a status reply is sent for a lockspace that doesn't yet exist, the message sequence number from the sender was not being copied into the reply causing the sender to ignore the reply. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [DLM] reject replies to old requestsDavid Teigland2006-08-091-4/+16
| | | | | | | | | | | | When recoveries are aborted by other recoveries we can get replies to status or names requests that we've given up on. This can cause problems if we're making another request and receive an old reply. Add a sequence number to status/names requests and reject replies that don't match. A field already exists for the seq number that's used in other message types. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [DLM] show nodeid for recovery messageDavid Teigland2006-08-091-0/+2
| | | | | | | | To aid debugging, it's useful to be able to see what nodeid the dlm is waiting on for a message reply. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [DLM] Remove range locks from the DLMDavid Teigland2006-02-231-3/+0
| | | | | | | This patch removes support for range locking from the DLM Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
* [DLM] The core of the DLM for GFS2/CLVMDavid Teigland2006-01-181-0/+460
This is the core of the distributed lock manager which is required to use GFS2 as a cluster filesystem. It is also used by CLVM and can be used as a standalone lock manager independantly of either of these two projects. It implements VAX-style locking modes. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steve Whitehouse <swhiteho@redhat.com>
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