linux.git/fs/dlm/lockspace.c, branch v3.1

dlm: use workqueue for callbacks

2011-07-15T17:30:43+00:00

Instead of creating our own kthread (dlm_astd) to deliver
callbacks for all lockspaces, use a per-lockspace workqueue
to deliver the callbacks.  This eliminates complications and
slowdowns from many lockspaces sharing the same thread.

Signed-off-by: David Teigland

dlm: improve rsb searches

2011-07-12T21:02:09+00:00

By pre-allocating rsb structs before searching the hash
table, they can be inserted immediately.  This avoids
always having to repeat the search when adding the struct
to hash list.

This also adds space to the rsb struct for a max resource
name, so an rsb allocation can be used by any request.
The constant size also allows us to finally use a slab
for the rsb structs.

Signed-off-by: David Teigland

dlm: keep lkbs in idr

2011-07-11T13:43:45+00:00

This is simpler and quicker than the hash table, and
avoids needing to search the hash list for every new
lkid to check if it's used.

Signed-off-by: David Teigland

dlm: use vmalloc for hash tables

2011-07-01T20:49:23+00:00

Allocate dlm hash tables in the vmalloc area to allow a greater
maximum size without restructuring of the hash table code.

Signed-off-by: Bryn M. Reeves 
Signed-off-by: David Teigland

dlm: delayed reply message warning

2011-04-01T19:19:06+00:00

Add an option (disabled by default) to print a warning message
when a lock has been waiting a configurable amount of time for
a reply message from another node.  This is mainly for debugging.

Signed-off-by: David Teigland

Driver core: Constify struct sysfs_ops in struct kobj_type

2010-03-08T01:04:49+00:00

Constify struct sysfs_ops.

This is part of the ops structure constification
effort started by Arjan van de Ven et al.

Benefits of this constification:

 * prevents modification of data that is shared
   (referenced) by many other structure instances
   at runtime

 * detects/prevents accidental (but not intentional)
   modification attempts on archs that enforce
   read-only kernel data at runtime

 * potentially better optimized code as the compiler
   can assume that the const data cannot be changed

 * the compiler/linker move const data into .rodata
   and therefore exclude them from false sharing

Signed-off-by: Emese Revfy 
Acked-by: David Teigland 
Acked-by: Matt Domsch 
Acked-by: Maciej Sosnowski 
Acked-by: Hans J. Koch 
Acked-by: Pekka Enberg 
Acked-by: Jens Axboe 
Acked-by: Stephen Hemminger 
Signed-off-by: Greg Kroah-Hartman

dlm: Send lockspace name with uevents

2010-02-26T18:14:25+00:00

Although it is possible to get this information from the path,
its much easier to provide the lockspace as a seperate env
variable.

Signed-off-by: Steven Whitehouse 
Signed-off-by: David Teigland

dlm: always use GFP_NOFS

2009-11-30T22:34:43+00:00

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

dlm: fix use count with multiple joins

2009-05-07T15:14:42+00:00

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

dlm: Make name input parameter of {,dlm_}new_lockspace() const

2009-05-07T15:14:26+00:00

| 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 
Signed-off-by: David Teigland