Commit Graph

183 Commits

Author SHA1 Message Date
Denis Cheng 0fe410d3f3 dlm: static initialization improvements
also change name_prefix from char pointer to char array.

Signed-off-by: Denis Cheng <crquan@gmail.com>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-30 11:04:43 -06:00
David Teigland dbcfc34733 dlm: clean ups
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>
2008-01-30 11:04:43 -06:00
Patrick Caulfeld 2a79289e87 dlm: Sanity check namelen before copying it
The 32/64 compatibility code in the DLM does not check the validity of
the lock name length passed into it, so it can easily overwrite memory
if the value is rubbish (as early versions of libdlm can cause with
unlock calls, it doesn't zero the field).

This patch restricts the length of the name to the amount of data
actually passed into the call.

Signed-off-by: Patrick Caulfield <pcaulfie@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-30 11:04:43 -06:00
David Teigland 85f0379aa0 dlm: keep cached master rsbs during recovery
To prevent the master of an rsb from changing rapidly, an unused rsb is kept
on the "toss list" for a period of time to be reused.  The toss list was
being cleared completely for each recovery, which is unnecessary.  Much of
the benefit of the toss list can be maintained if nodes keep rsb's in their
toss list that they are the master of.  These rsb's need to be included
when the resource directory is rebuilt during recovery.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-30 11:04:43 -06:00
David Teigland 594199ebaa dlm: change error message to debug
The invalid lockspace messages are normal and can appear relatively
often.  They should be suppressed without debugging enabled.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-30 11:04:43 -06:00
David Teigland ce5246b972 dlm: fix possible use-after-free
The dlm_put_lkb() can free the lkb and its associated ua structure,
so we can't depend on using the ua struct after the put.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-30 11:04:42 -06:00
David Teigland 755b5eb8ba dlm: limit dir lookup loop
In a rare case we may need to repeat a local resource directory lookup
due to a race with removing the rsb and removing the resdir record.
We'll never need to do more than a single additional lookup, though,
so the infinite loop around the lookup can be removed.  In addition
to being unnecessary, the infinite loop is dangerous since some other
unknown condition may appear causing the loop to never break.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-30 11:04:42 -06:00
David Teigland 42dc1601a9 dlm: reject normal unlock when lock is waiting for lookup
Non-forced unlocks should be rejected if the lock is waiting on the
rsb_lookup list for another lock to establish the master node.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-30 11:04:42 -06:00
David Teigland c54e04b00f dlm: validate messages before processing
There was some hit and miss validation of messages that has now been
cleaned up and unified.  Before processing a message, the new
validate_message() function checks that the lkb is the appropriate type,
process-copy or master-copy, and that the message is from the correct
nodeid for the the given lkb.  Other checks and assertions on the
lkb type and nodeid have been removed.  The assertions were particularly
bad since they would panic the machine instead of just ignoring the bad
message.

Although other recent patches have made processing old message unlikely,
it still may be possible for an old message to be processed and caught
by these checks.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-30 11:04:42 -06:00
David Teigland 46b43eed70 dlm: reject messages from non-members
Messages from nodes that are no longer members of the lockspace should be
ignored.  When nodes are removed from the lockspace, recovery can
sometimes complete quickly enough that messages arrive from a removed node
after recovery has completed.  When processed, these messages would often
cause an error message, and could in some cases change some state, causing
problems.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-30 11:04:42 -06:00
David Teigland aec64e1be2 dlm: another call to confirm_master in receive_request_reply
When a failed request (EBADR or ENOTBLK) is unlocked/canceled instead of
retried, there may be other lkb's waiting on the rsb_lookup list for it
to complete.  A call to confirm_master() is needed to move on to the next
waiting lkb since the current one won't be retried.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-30 11:04:42 -06:00
David Teigland 601342ce02 dlm: recover locks waiting for overlap replies
When recovery looks at locks waiting for replies, it fails to consider
locks that have already received a reply for their first remote operation,
but not received a reply for secondary, overlapping unlock/cancel.  The
appropriate stub reply needs to be called for these waiters.

Appears when we start doing recovery in the presence of a many overlapping
unlock/cancel ops.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-30 11:04:42 -06:00
David Teigland 8a358ca8e7 dlm: clear ast_type when removing from astqueue
The lkb_ast_type field indicates whether the lkb is on the astqueue list.
When clearing locks for a process, lkb's were being removed from the astqueue
list without clearing the field.  If release_lockspace then happened
immediately afterward, it could try to remove the lkb from the list a second
time.

Appears when process calls libdlm dlm_release_lockspace() which first
closes the ls dev triggering clear_proc_locks, and then removes the ls
(a write to control dev) causing release_lockspace().

Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-30 11:04:42 -06:00
David Teigland 861e2369e9 dlm: use fixed errno values in messages
Some errno values differ across platforms. So if we return things like
-EINPROGRESS from one node it can get misinterpreted or rejected on
another one.

This patch fixes up the errno values passed on the wire so that they
match the x86 ones (so as not to break the protocol), and re-instates
the platform-specific ones at the other end.

Many thanks to Fabio for testing this patch.
Initial patch from Patrick.

Signed-off-by: Patrick Caulfield <pcaulfie@redhat.com>
Signed-off-by: Fabio M. Di Nitto <fabbione@ubuntu.com>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-30 11:04:42 -06:00
Fabio M. Di Nitto 550283e30c dlm: swap bytes for rcom lock reply
DLM_RCOM_LOCK_REPLY messages need byte swapping.

Signed-off-by: Fabio M. Di Nitto <fabbione@ubuntu.com>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-30 11:04:41 -06:00
Fabio M. Di Nitto e7847d35ac dlm: align midcomms message buffer
gcc does not guarantee that an auto buffer is 64bit aligned.
This change allows sparc64 to work.

Signed-off-by: Fabio M. Di Nitto <fabbione@ubuntu.com>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-30 11:04:25 -06:00
Patrick Caulfeld 39bd4177dd dlm: close othercons
This patch addresses a problem introduced with the last round of
lowcomms patches where the 'othercon' connections do not get freed when
the DLM shuts down.

This results in the error message
"slab error in kmem_cache_destroy(): cache `dlm_conn': Can't free all
objects"

and the DLM cannot be restarted without a system reboot.

See bz#428119

Signed-off-by: Patrick Caulfield <pcaulfie@redhat.com>
Signed-off-by: Fabio M. Di Nitto <fabbione@ubuntu.com>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-29 17:17:32 -06:00
David Teigland 52bda2b5ba dlm: use dlm prefix on alloc and free functions
The dlm functions in memory.c should use the dlm_ prefix.  Also, use
kzalloc/kfree directly for dlm_direntry's, removing the wrapper functions.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-29 17:17:19 -06:00
David Teigland 11b2498ba7 dlm: don't print common non-errors
Change log_error() to log_debug() for conditions that can occur in
large number in normal operation.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-29 17:17:08 -06:00
Adrian Bunk e028398da7 dlm: proper prototypes
This patch adds a proper prototype for some functions in
fs/dlm/dlm_internal.h

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-29 17:16:52 -06:00
Lon Hohberger 6bd8fedaa1 dlm: bind connections from known local address when using TCP
A common problem occurs when multiple IP addresses within the same
subnet are assigned to the same NIC.  If we make a connection attempt to
another address on the same subnet as one of those addresses, the
connection attempt will not necessarily be routed from the address we
want.

In the case of the DLM, the other nodes will quickly drop the connection
attempt, causing problems.

This patch makes the DLM bind to the local address it acquired from the
cluster manager when using TCP prior to making a connection, obviating
the need for administrators to "fix" their systems or use clever routing
tricks.

Signed-off-by: Lon Hohberger <lhh@redhat.com>
Signed-off-by: Patrick Caulfield <pcaulfie@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-01-29 16:44:25 -06:00
Greg Kroah-Hartman 197b12d679 Kobject: convert fs/* from kobject_unregister() to kobject_put()
There is no need for kobject_unregister() anymore, thanks to Kay's
kobject cleanup changes, so replace all instances of it with
kobject_put().


Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-24 20:40:40 -08:00
Greg Kroah-Hartman 901195ed7f Kobject: change GFS2 to use kobject_init_and_add
Stop using kobject_register, as this way we can control the sending of
the uevent properly, after everything is properly initialized.

Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-24 20:40:26 -08:00
Greg Kroah-Hartman 0ff21e4663 kobject: convert kernel_kset to be a kobject
kernel_kset does not need to be a kset, but a much simpler kobject now
that we have kobj_attributes.

We also rename kernel_kset to kernel_kobj to catch all users of this
symbol with a build error instead of an easy-to-ignore build warning.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-24 20:40:24 -08:00
Greg Kroah-Hartman bd35b93d80 kset: convert kernel_subsys to use kset_create
Dynamically create the kset instead of declaring it statically.  We also
rename kernel_subsys to kernel_kset to catch all users of this symbol
with a build error instead of an easy-to-ignore build warning.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-24 20:40:14 -08:00
Greg Kroah-Hartman d405936b32 kset: convert dlm to use kset_create
Dynamically create the kset instead of declaring it statically.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-24 20:40:14 -08:00
Greg Kroah-Hartman 3514faca19 kobject: remove struct kobj_type from struct kset
We don't need a "default" ktype for a kset.  We should set this
explicitly every time for each kset.  This change is needed so that we
can make ksets dynamic, and cleans up one of the odd, undocumented
assumption that the kset/kobject/ktype model has.

This patch is based on a lot of help from Kay Sievers.

Nasty bug in the block code was found by Dave Young
<hidave.darkstar@gmail.com>

Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Dave Young <hidave.darkstar@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-24 20:40:10 -08:00
David S. Miller df61c95262 [DLM] lowcomms: Do not muck with sysctl_rmem_max.
Use SO_RCVBUFFORCE instead.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-11-07 04:11:42 -08:00
Pavel Emelyanov ba25f9dcc4 Use helpers to obtain task pid in printks
The task_struct->pid member is going to be deprecated, so start
using the helpers (task_pid_nr/task_pid_vnr/task_pid_nr_ns) in
the kernel.

The first thing to start with is the pid, printed to dmesg - in
this case we may safely use task_pid_nr(). Besides, printks produce
more (much more) than a half of all the explicit pid usage.

[akpm@linux-foundation.org: git-drm went and changed lots of stuff]
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Cc: Dave Airlie <airlied@linux.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19 11:53:43 -07:00
Jan Engelhardt a77b645609 menuconfig: transform NLS and DLM menus
Changes NLS and DLM menus into a 'menuconfig' object so that it can be
disabled at once without having to enter the menu first to disable the config
option.

Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17 08:43:00 -07:00
Linus Torvalds efefc6eb38 Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/driver-2.6
* master.kernel.org:/pub/scm/linux/kernel/git/gregkh/driver-2.6: (75 commits)
  PM: merge device power-management source files
  sysfs: add copyrights
  kobject: update the copyrights
  kset: add some kerneldoc to help describe what these strange things are
  Driver core: rename ktype_edd and ktype_efivar
  Driver core: rename ktype_driver
  Driver core: rename ktype_device
  Driver core: rename ktype_class
  driver core: remove subsystem_init()
  sysfs: move sysfs file poll implementation to sysfs_open_dirent
  sysfs: implement sysfs_open_dirent
  sysfs: move sysfs_dirent->s_children into sysfs_dirent->s_dir
  sysfs: make sysfs_root a regular directory dirent
  sysfs: open code sysfs_attach_dentry()
  sysfs: make s_elem an anonymous union
  sysfs: make bin attr open get active reference of parent too
  sysfs: kill unnecessary NULL pointer check in sysfs_release()
  sysfs: kill unnecessary sysfs_get() in open paths
  sysfs: reposition sysfs_dirent->s_mode.
  sysfs: kill sysfs_update_file()
  ...
2007-10-12 15:49:37 -07:00
Greg Kroah-Hartman 34980ca8fa Drivers: clean up direct setting of the name of a kset
A kset should not have its name set directly, so dynamically set the
name at runtime.

This is needed to remove the static array in the kobject structure which
will be changed in a future patch.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-10-12 14:51:02 -07:00
David Teigland c36258b592 [DLM] block dlm_recv in recovery transition
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>
2007-10-10 08:56:38 +01:00
Patrick Caulfield b434eda6fd [DLM] don't overwrite castparam if it's NULL
If the castaddr passed to the userland API is NULL then don't overwrite the
existing castparam. This allows a different thread to cancel a lock request and
the CANCEL AST gets delivered to the original thread.

bz#306391 (for RHEL4) refers.

Signed-Off-By: Patrick Caulfield <pcaulfie@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-10-10 08:56:36 +01:00
Patrick Caulfield d66f8277f5 [DLM] Make dlm_sendd cond_resched more
Under high recovery loads dlm_sendd can monopolise the CPU and cause soft lockups.

This one extra and one moved cond_resched() make it yield a little more during
such times keeping work moving.

Signed-Off-By: Patrick Caulfield <pcaulfie@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-10-10 08:56:19 +01:00
Patrick Caulfield 61d96be0f4 [DLM] Fix lowcomms socket closing
This patch fixes the slight mess made in lowcomms closing by previous patches
and fixes all sorts of DLM hangs.

Signed-Off-By: Patrick Caulfield <pcaulfie@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-10-10 08:55:39 +01:00
David Teigland 3650925893 [DLM] fix basts for granted PR waiting CW
Fix a long standing bug where a blocking callback would be missed
when there's a granted lock in PR mode and waiting locks in both
PR and CW modes (and the PR lock was added to the waiting queue
before the CW lock).  The logic simply compared the numerical values
of the modes to determine if a blocking callback was required, but in
the one case of PR and CW, the lower valued CW mode blocks the higher
valued PR mode.  We just need to add a special check for this PR/CW
case in the tests that decide when a blocking callback is needed.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-08-14 10:31:02 +01:00
Patrick Caulfield 9e5f2825a8 [DLM] More othercon fixes
The last patch to clean out 'othercon' structures only fixed half the problem.
The attached addresses the other situations too, and fixes bz#238490

Signed-Off-By: Patrick Caulfield <pcaulfie@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-08-14 10:30:36 +01:00
Jesper Juhl 1a2bf2eefb [DLM] Fix memory leak in dlm_add_member() when dlm_node_weight() returns less than zero
There's a memory leak in fs/dlm/member.c::dlm_add_member().

If "dlm_node_weight(ls->ls_name, nodeid)" returns < 0, then
we'll return without freeing the memory allocated to the (at
that point yet unused) 'memb'.
This patch frees the allocated memory in that case and thus
avoids the leak.

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-08-14 10:30:04 +01:00
Patrick Caulfield 01c8cab258 [DLM] zero unused parts of sockaddr_storage
When we build a sockaddr_storage for an IP address, clear the unused parts as
they could be used for node comparisons.

I have seen this occasionally make sctp connections fail.

Signed-Off-By: Patrick Caulfield <pcaulfie@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-08-14 10:29:27 +01:00
David Teigland 41684f9547 [DLM] fix NULL ls usage
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>
2007-08-14 10:28:44 +01:00
Patrick Caulfield 25720c2d73 [DLM] Clear othercon pointers when a connection is closed
This patch clears the othercon pointer and frees the memory when a connnection
is closed. This could cause a small memory leak when nodes leave the cluster.

Signed-Off-By: Patrick Caulfield <pcaulfie@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-08-14 10:28:05 +01:00
Paul Mundt 20c2df83d2 mm: Remove slab destructors from kmem_cache_create().
Slab destructors were no longer supported after Christoph's
c59def9f22 change. They've been
BUGs for both slab and slub, and slob never supported them
either.

This rips out support for the dtor pointer from kmem_cache_create()
completely and fixes up every single callsite in the kernel (there were
about 224, not including the slab allocator definitions themselves,
or the documentation references).

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-07-20 10:11:58 +09:00
Yoann Padioleau dd00cc486a some kmalloc/memset ->kzalloc (tree wide)
Transform some calls to kmalloc/memset to a single kzalloc (or kcalloc).

Here is a short excerpt of the semantic patch performing
this transformation:

@@
type T2;
expression x;
identifier f,fld;
expression E;
expression E1,E2;
expression e1,e2,e3,y;
statement S;
@@

 x =
- kmalloc
+ kzalloc
  (E1,E2)
  ...  when != \(x->fld=E;\|y=f(...,x,...);\|f(...,x,...);\|x=E;\|while(...) S\|for(e1;e2;e3) S\)
- memset((T2)x,0,E1);

@@
expression E1,E2,E3;
@@

- kzalloc(E1 * E2,E3)
+ kcalloc(E1,E2,E3)

[akpm@linux-foundation.org: get kcalloc args the right way around]
Signed-off-by: Yoann Padioleau <padator@wanadoo.fr>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Cc: Bryan Wu <bryan.wu@analog.com>
Acked-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Dave Airlie <airlied@linux.ie>
Acked-by: Roland Dreier <rolandd@cisco.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Acked-by: Pierre Ossman <drzeus-list@drzeus.cx>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: "David S. Miller" <davem@davemloft.net>
Acked-by: Greg KH <greg@kroah.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-19 10:04:50 -07:00
Joel Becker e6bd07aee7 configfs: Convert subsystem semaphore to mutex
Convert the su_sem member of struct configfs_subsystem to a struct
mutex, as that's what it is. Also convert all the users and update
Documentation/configfs.txt and Documentation/configfs_example.c
accordingly.

[ Conflict in fs/dlm/config.c with commit
  3168b0780d manually resolved. --Mark ]

Inspired-by: Satyam Sharma <ssatyam@cse.iitk.ac.in>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
2007-07-10 17:10:56 -07:00
Satyam Sharma 3fe6c5ce11 [PATCH] configfs+dlm: Rename config_group_find_obj and state semantics clearly
Configfs being based upon sysfs code, config_group_find_obj() is probably
so named because of the similar kset_find_obj() in sysfs. However,
"kobject"s in sysfs become "config_item"s in configfs, so let's call it
config_group_find_item() instead, for sake of uniformity, and make
corresponding change in the users of this function.

BTW a crucial difference between kset_find_obj and config_group_find_item
is in locking expectations. kset_find_obj does its locking by itself, but
config_group_find_item expects the *caller* to do the locking. The reason
for this: kset's have their own locks, config_group's don't but instead
rely on the subsystem mutex. And, subsystem needn't necessarily be around
when config_group_find_item() is called.

So let's state these locking semantics explicitly, and rectify the comment,
otherwise bugs could continue to occur in future, as they did in the past
(refer commit d82b8191e238 in gfs2-2.6-fixes.git).

[ I also took the opportunity to fix some bad whitespace and
double-empty lines. --Joel ]

[ Conflict in fs/dlm/config.c with commit
  3168b0780d manually resolved. --Mark ]

Signed-off-by: Satyam Sharma <ssatyam@cse.iitk.ac.in>
Cc: David Teigland <teigland@redhat.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
2007-07-10 17:02:31 -07:00
Satyam Sharma 9b1d9aa4e9 [PATCH] configfs+dlm: Separate out __CONFIGFS_ATTR into configfs.h
fs/dlm/config.c contains a useful generic macro called __CONFIGFS_ATTR
that is similar to sysfs' __ATTR macro that makes defining attributes
easy for any user of configfs. Separate it out into configfs.h so that
other users (forthcoming in dynamic netconsole patchset) can use it too.

Signed-off-by: Satyam Sharma <ssatyam@cse.iitk.ac.in>
Cc: David Teigland <teigland@redhat.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
2007-07-10 16:52:27 -07:00
David Teigland ac90a25525 [DLM] dump more lock values
Add two more output fields (lkb_flags and rsb nodeid) to the new debugfs
file that dumps one lock per line.  Also, dump all locks instead of just
mastered locks.  Accordingly, use a suffix of _locks instead of _master.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-07-09 08:24:13 +01:00
akpm@linux-foundation.org f4fadb23ca [GFS2] git-gfs2-nmw-build-fix
Cc: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-07-09 08:24:06 +01:00
Patrick Caulfield 97d848365e [DLM] Telnet to port 21064 can stop all lockspaces
This patch fixes Red Hat bz#245892

Opening a tcp connection from a cluster member to another cluster member
targeting the dlm port it is enough to stop every dlm operation in the cluster.
This means that GFS and rgmanager will hang.

Signed-Off-By: Patrick Caulfield <pcaulfie@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2007-07-09 08:23:57 +01:00