- 26 Feb, 2010 6 commits
-
-
Joel Becker authored
Unlike ocfs2, dlmfs has no permanent storage. It can't store off a cluster stack it is supposed to be using. So it can't specify the stack name in ocfs2_cluster_connect(). Instead, we create ocfs2_cluster_connect_agnostic(), which simply uses the stack that is currently enabled. This is find for dlmfs, which will rely on the stack initialization. We add the "stackglue" capability to dlmfs's capability list. This lets userspace know dlmfs can be used with all cluster stacks. Signed-off-by:Joel Becker <joel.becker@oracle.com>
-
Joel Becker authored
Inside the stackglue, the locking protocol structure is hanging off of the ocfs2_cluster_connection. This takes it one further; the locking protocol is passed into ocfs2_cluster_connect(). Now different cluster connections can have different locking protocols with distinct asts. Note that all locking protocols have to keep their maximum protocol version in lock-step. With the protocol structure set in ocfs2_cluster_connect(), there is no need for the stackglue to have a static pointer to a specific protocol structure. We can change initialization to only pass in the maximum protocol version. Signed-off-by: -
Joel Becker authored
With the full ocfs2_locking_protocol hanging off of the ocfs2_cluster_connection, ast wrappers can get the ast/bast pointers there. They don't need to get them from their plugin structure. The user plugin still needs the maximum locking protocol version, though. This changes the plugin structure so that it only holds the max version, not the entire ocfs2_locking_protocol pointer. Signed-off-by: -
Joel Becker authored
With the ocfs2_cluster_connection hanging off of the ocfs2_dlm_lksb, we have access to it in the ast and bast wrapper functions. Attach the ocfs2_locking_protocol to the conn. Now, instead of refering to a static variable for ast/bast pointers, the wrappers can look at the connection. This means different connections can have different ast/bast pointers, and it reduces the need for the static pointer. Signed-off-by: -
Joel Becker authored
We're going to want it in the ast functions, so we convert union ocfs2_dlm_lksb to struct ocfs2_dlm_lksb and let it carry the connection. Signed-off-by: -
Joel Becker authored
The stackglue ast and bast functions tried to maintain the fiction that their arguments were void pointers. In reality, stack_user.c had to know that the argument was an ocfs2_lock_res in order to get the status off of the lksb. That's ugly. This changes stackglue to always pass the lksb as the argument to ast and bast functions. The caller can always use container_of() to get the ocfs2_lock_res or user_dlm_lock_res. The net effect to the caller is zero. They still get back the lockres in their ast. stackglue gets cleaner, and now can use the lksb itself. Signed-off-by:
-
- 22 Jun, 2009 1 commit
-
-
Joel Becker authored
The Lock Value Block (LVB) of a DLM lock can be lost when nodes die and the DLM cannot reconstruct its state. Clients of the DLM need to know this. ocfs2's internal DLM, o2dlm, explicitly zeroes out the LVB when it loses track of the state. This is not a standard behavior, but ocfs2 has always relied on it. Thus, an o2dlm LVB is always "valid". ocfs2 now supports both o2dlm and fs/dlm via the stack glue. When fs/dlm loses track of an LVBs state, it sets a flag (DLM_SBF_VALNOTVALID) on the Lock Status Block (LKSB). The contents of the LVB may be garbage or merely stale. ocfs2 doesn't want to try to guess at the validity of the stale LVB. Instead, it should be checking the VALNOTVALID flag. As this is the 'standard' way of treating LVBs, we will promote this behavior. We add a stack glue API ocfs2_dlm_lvb_valid(). It returns non-zero when the LVB is valid. o2dlm will always return valid, while fs/dlm will check VALNOTVALID. Signed-off-by:
Mark Fasheh <mfasheh@suse.com>
-
- 13 Oct, 2008 1 commit
-
-
Mark Fasheh authored
This is actually pretty easy since fs/dlm already handles the bulk of the work. The Ocfs2 userspace cluster stack module already uses fs/dlm as the underlying lock manager, so I only had to add the right calls. Cluster-aware POSIX locks ("plocks") can be turned off by the same means at UNIX locks - mount with 'noflocks', or create a local-only Ocfs2 volume. Internally, the file system uses two sets of file_operations, depending on whether cluster aware plocks is required. This turns out to be easier than implementing local-only versions of ->lock. Signed-off-by:
-
- 16 Jun, 2008 3 commits
-
-
Joel Becker authored
The ->hangup() call was only used to execute ocfs2_hb_ctl. Now that the generic stack glue code handles this, the underlying stack drivers don't need to know about it. Signed-off-by:
-
Joel Becker authored
Take o2hb_stop() out of the o2cb code and make it part of the generic stack glue as ocfs2_leave_group(). This also allows us to remove the ocfs2_get_hb_ctl_path() function - everything to do with hb_ctl is now part of stackglue.c. o2cb no longer needs a ->hangup() function. Signed-off-by:
-
Joel Becker authored
ocfs2 needs to call out to the hb_ctl program at unmount for all cluster stacks. The first step is to move the hb_ctl_path sysctl out of the o2cb code and into the generic stack glue. Signed-off-by:
-
- 18 Apr, 2008 13 commits
-
-
David Teigland authored
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 authored
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 authored
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 authored
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 authored
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 authored
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 authored
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 authored
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 authored
This step introduces a cluster stack agnostic API for initializing and exiting. fs/ocfs2/dlmglue.c no longer uses o2cb/o2dlm knowledge to connect to the stack. It is all handled in stackglue.c. heartbeat.c no longer needs to know how it gets called. ocfs2_do_node_down() is now a clean recovery trigger. The big gotcha is the ordering of initializations and de-initializations done underneath ocfs2_cluster_connect(). ocfs2_dlm_init() used to do all o2dlm initialization in one block. Thus, the o2dlm functionality of ocfs2_cluster_connect() is very straightforward. ocfs2_dlm_shutdown(), however, did a few things between de-registration of the eviction callback and actually shutting down the domain. Now de-registration and shutdown of the domain are wrapped within the single ocfs2_cluster_disconnect() call. I've checked the code paths to make sure we can safely tear down things in ocfs2_dlm_shutdown() before calling ocfs2_cluster_disconnect(). The filesystem has already set itself to ignore the callback. Signed-off-by:
-
Joel Becker authored
Wrap the lock status block (lksb) in a union. Later we will add a union element for the fs/dlm lksb. Create accessors for the status and lvb fields. Other than a debugging function, dlmglue.c does not directly reference the o2dlm locking path anymore. Signed-off-by:
-
Joel Becker authored
Change the ocfs2_dlm_lock/unlock() functions to return -errno values. This is the first step towards elminiating dlm_status in fs/ocfs2/dlmglue.c. The change also passes -errno values to ->unlock_ast(). [ Fix a return code in dlmglue.c and change the error translation table into an array of ints. --Mark ] Signed-off-by:
-
Joel Becker authored
The ocfs2 generic code should use the values in <linux/dlmconstants.h>. stackglue.c will convert them to o2dlm values. Signed-off-by:
-
Joel Becker authored
This is the first in a series of patches to isolate ocfs2 from the underlying cluster stack. Here we wrap the dlm locking functions with ocfs2-specific calls. Because ocfs2 always uses the same dlm lock status callbacks, we can eliminate the callbacks from the filesystem visible functions. Signed-off-by:
-
