04 Jan, 2012
2 commits
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These new callbacks notify the dlm user about lock recovery.
GFS2, and possibly others, need to be aware of when the dlm
will be doing lock recovery for a failed lockspace member.In the past, this coordination has been done between dlm and
file system daemons in userspace, which then direct their
kernel counterparts. These callbacks allow the same
coordination directly, and more simply.Signed-off-by: David Teigland
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Slot numbers are assigned to nodes when they join the lockspace.
The slot number chosen is the minimum unused value starting at 1.
Once a node is assigned a slot, that slot number will not change
while the node remains a lockspace member. If the node leaves
and rejoins it can be assigned a new slot number.A new generation number is also added to a lockspace. It is
set and incremented during each recovery along with the slot
collection/assignment.The slot numbers will be passed to gfs2 which will use them as
journal id's.Signed-off-by: David Teigland
19 Nov, 2011
1 commit
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Change the linked lists to rb_tree's in the rsb
hash table to speed up searches. Slow rsb searches
were having a large impact on gfs2 performance due
to the large number of dlm locks gfs2 uses.Signed-off-by: Bob Peterson
Signed-off-by: David Teigland
16 Jul, 2011
1 commit
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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
13 Jul, 2011
1 commit
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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
11 Jul, 2011
1 commit
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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
02 Jul, 2011
1 commit
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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
02 Apr, 2011
1 commit
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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
08 Mar, 2010
1 commit
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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 sharingSigned-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
27 Feb, 2010
1 commit
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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
01 Dec, 2009
1 commit
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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
07 May, 2009
2 commits
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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
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| 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
29 Jan, 2009
1 commit
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The ls_dirtbl[].lock was an rwlock, but since it was only used in write
mode a spinlock will suffice.Signed-off-by: Steven Whitehouse
Signed-off-by: David Teigland
09 Jan, 2009
1 commit
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The rwlock is almost always used in write mode, so there's no reason
to not use a spinlock instead.Signed-off-by: David Teigland
14 Nov, 2008
1 commit
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Fixes a regression from commit 0f8e0d9a317406612700426fad3efab0b7bbc467,
"dlm: allow multiple lockspace creates".An extraneous 'else' slipped into a code fragment being moved from
release_lockspace() to dlm_release_lockspace(). The result of the
unwanted 'else' is that dlm threads and structures are not stopped
and cleaned up when the final dlm lockspace is removed. Trying to
create a new lockspace again afterward will fail with
"kmem_cache_create: duplicate cache dlm_conn" because the cache
was not previously destroyed.Signed-off-by: David Teigland
29 Aug, 2008
3 commits
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The dlm_scand thread needs to lock the list of lockspaces
when going through it.Signed-off-by: David Teigland
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If dlm_controld (the userspace daemon that controls the setup and
recovery of the dlm) fails, the kernel should shut down the lockspaces
in the kernel rather than leaving them running. This is detected by
having dlm_controld hold a misc device open while running, and if
the kernel detects a close while the daemon is still needed, it stops
the lockspaces in the kernel.Knowing that the userspace daemon isn't running also allows the
lockspace create/remove routines to avoid waiting on the daemon
for join/leave operations.Signed-off-by: David Teigland
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Add a count for lockspace create and release so that create can
be called multiple times to use the lockspace from different places.
Also add the new flag DLM_LSFL_NEWEXCL to create a lockspace with
the previous behavior of returning -EEXIST if the lockspace already
exists.Signed-off-by: David Teigland
30 Apr, 2008
1 commit
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__FUNCTION__ is gcc-specific, use __func__
Signed-off-by: Harvey Harrison
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
07 Feb, 2008
1 commit
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it moves 365 bytes from .text to .init.text, and 30 bytes from .text to
.exit.text, saves memory.Signed-off-by: Denis Cheng
Signed-off-by: David Teigland
30 Jan, 2008
2 commits
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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
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This patch adds a proper prototype for some functions in
fs/dlm/dlm_internal.hSigned-off-by: Adrian Bunk
Signed-off-by: David Teigland
25 Jan, 2008
6 commits
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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
Signed-off-by: Greg Kroah-Hartman -
Stop using kobject_register, as this way we can control the sending of
the uevent properly, after everything is properly initialized.Cc: Steven Whitehouse
Cc: Kay Sievers
Signed-off-by: Greg Kroah-Hartman -
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
Signed-off-by: Greg Kroah-Hartman -
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
Signed-off-by: Greg Kroah-Hartman -
Dynamically create the kset instead of declaring it statically.
Cc: Kay Sievers
Cc: Steven Whitehouse
Signed-off-by: Greg Kroah-Hartman -
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
Cc: Kay Sievers
Cc: Dave Young
Signed-off-by: Greg Kroah-Hartman
13 Oct, 2007
2 commits
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* 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()
... -
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
10 Oct, 2007
1 commit
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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
Signed-off-by: Steven Whitehouse
09 Jul, 2007
6 commits
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Mask off the recently added DLM_LSFL_FS flag when setting the exflags.
This way all the nodes in the lockspace aren't required to have the FS
flag set, since we later check that exflags matches among all nodes.Signed-off-by: Patrick Caulfield
Signed-off-by: David Teigland
Signed-off-by: Steven Whitehouse -
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
Signed-Off-By: David Teigland
Signed-off-by: Steven Whitehouse -
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
Signed-off-by: Steven Whitehouse -
Fix the error path when exiting new_lockspace(). It was kfree'ing the
lockspace struct at the end, but that's only valid if it exits before
kobject_register occured. After kobject_register we have to let the
kobject do the freeing.Signed-off-by: David Teigland
Signed-off-by: Steven Whitehouse -
New features: lock timeouts and time warnings. If the DLM_LKF_TIMEOUT
flag is set, then the request/conversion will be canceled after waiting
the specified number of centiseconds (specified per lock). This feature
is only available for locks requested through libdlm (can be enabled for
kernel dlm users if there's a use for it.)If the new DLM_LSFL_TIMEWARN flag is set when creating the lockspace, then
a warning message will be sent to userspace (using genetlink) after a
request/conversion has been waiting for a given number of centiseconds
(configurable per node). The time warnings will be used in the future
to do deadlock detection in userspace.Signed-off-by: David Teigland
Signed-off-by: Steven Whitehouse -
Don't let dlm_scand run during recovery since it may try to do a resource
directory removal while the directory nodes are changing.Signed-off-by: David Teigland
Signed-off-by: Steven Whitehouse
08 May, 2007
1 commit
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* git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw: (34 commits)
[GFS2] Uncomment sprintf_symbol calling code
[DLM] lowcomms style
[GFS2] printk warning fixes
[GFS2] Patch to fix mmap of stuffed files
[GFS2] use lib/parser for parsing mount options
[DLM] Lowcomms nodeid range & initialisation fixes
[DLM] Fix dlm_lowcoms_stop hang
[DLM] fix mode munging
[GFS2] lockdump improvements
[GFS2] Patch to detect corrupt number of dir entries in leaf and/or inode blocks
[GFS2] bz 236008: Kernel gpf doing cat /debugfs/gfs2/xxx (lock dump)
[DLM] fs/dlm/ast.c should #include "ast.h"
[DLM] Consolidate transport protocols
[DLM] Remove redundant assignment
[GFS2] Fix bz 234168 (ignoring rgrp flags)
[DLM] change lkid format
[DLM] interface for purge (2/2)
[DLM] add orphan purging code (1/2)
[DLM] split create_message function
[GFS2] Set drop_count to 0 (off) by default
...
03 May, 2007
1 commit
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We need to work on cleaning up the relationship between kobjects, ksets and
ktypes. The removal of 'struct subsystem' is the first step of this,
especially as it is not really needed at all.Thanks to Kay for fixing the bugs in this patch.
Signed-off-by: Greg Kroah-Hartman