dlm_posix_get fills out the relevant fields in the file_lock before
returning when there is a lock conflict, but doesn't clean out any of
the other fields in the file_lock.
When nfsd does a NFSv4 lockt call, it sets the fl_lmops to
nfsd_posix_mng_ops before calling the lower fs. When the lock comes back
after testing a lock on GFS2, it still has that field set. This confuses
nfsd into thinking that the file_lock is a nfsd4 lock.
Fix this by making DLM reinitialize the file_lock before copying the
fields from the conflicting lock.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
We should use the original copy of the file_lock, fl, instead
of the copy, flc in the lockd notify callback. The range in flc has
been modified by posix_lock_file(), so it will not match a copy of the
lock in lockd.
Signed-off-by: David Teigland <teigland@redhat.com>
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 <teigland@redhat.com>
The old code would leak iterators and leave reference counts on
rsbs because it was ignoring the "stop" seq callback. The code
followed an example that used the seq operations differently.
This new code is based on actually understanding how the seq
operations work. It also improves things by saving the hash bucket
in the position to avoid cycling through completed buckets in start.
Siged-off-by: Davd Teigland <teigland@redhat.com>
fs/dlm/ast.c: In function 'dlm_astd':
fs/dlm/ast.c:64: warning: 'bastmode' may be used uninitialized in this function
Cleans code up.
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Teigland <teigland@redhat.com>
The new debugfs entry dumps all rsb and lkb structures, and includes
a lot more information than has been available before. This includes
the new timestamps added by a previous patch for debugging callback
issues.
Signed-off-by: David Teigland <teigland@redhat.com>
Record the time the latest blocking callback was queued for
a lock. This will be used for debugging in combination with
lock queue timestamp changes in the previous patch.
Signed-off-by: David Teigland <teigland@redhat.com>
Use ktime instead of jiffies for timestamping lkb's. Also stamp the
time on every lkb whenever it's added to a resource queue, instead of
just stamping locks subject to timeouts. This will allow us to use
timestamps more widely for debugging all locks.
Signed-off-by: David Teigland <teigland@redhat.com>
The lkb bastmode value is set in the context of processing the
lock, and read by the dlm_astd thread. Because it's accessed
in these two separate contexts, the writing/reading ought to
be done under a lock. This is simple to do by setting it and
reading it when the lkb is added to and removed from dlm_astd's
callback list which is properly locked.
Signed-off-by: David Teigland <teigland@redhat.com>
Just before delivering a blocking callback (bast), the dlm_astd
thread checks again that the granted mode of the lkb actually
blocks the mode requested by the bast. The idea behind this was
originally that the granted mode may have changed since the bast
was queued, making the callback now unnecessary. Reasons for
removing this extra check are:
- dlm_astd doesn't lock the rsb before reading the lkb grmode, so
it's not technically safe (this removes the long standing FIXME)
- after running some tests, it doesn't appear the check ever actually
eliminates a bast
- delivering an unnecessary blocking callback isn't a bad thing and
can happen anyway
Signed-off-by: David Teigland <teigland@redhat.com>
This is a one-liner to use cond_resched() rather than schedule()
in the ast delivery loop. It should not be necessary to schedule
every time, so this will save some cpu time while continuing to
allow scheduling when required.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
Use ls_allocation for memory allocations, which a cluster fs sets to
GFP_NOFS. Use GFP_NOFS for allocations when no lockspace struct is
available. Taking dlm locks needs to avoid calling back into the
cluster fs because write-out can require taking dlm locks.
Cc: Christine Caulfield <ccaulfie@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
this warning:
fs/dlm/netlink.c: In function ‘dlm_timeout_warn’:
fs/dlm/netlink.c:131: warning: ‘send_skb’ may be used uninitialized in this function
triggers because GCC does not recognize the (correct) error flow
between prepare_data() and send_skb.
Annotate it.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Fixes a regression from commit 0f8e0d9a31,
"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 <teigland@redhat.com>
sparc32:
fs/dlm/config.c:397: error: expected identifier or '(' before '{' token
fs/dlm/config.c: In function 'drop_node':
fs/dlm/config.c:589: warning: initialization from incompatible pointer type
fs/dlm/config.c:589: warning: initialization from incompatible pointer type
fs/dlm/config.c: In function 'release_node':
fs/dlm/config.c:601: warning: initialization from incompatible pointer type
fs/dlm/config.c:601: warning: initialization from incompatible pointer type
fs/dlm/config.c: In function 'show_node':
fs/dlm/config.c:717: warning: initialization from incompatible pointer type
fs/dlm/config.c:717: warning: initialization from incompatible pointer type
fs/dlm/config.c: In function 'store_node':
fs/dlm/config.c:726: warning: initialization from incompatible pointer type
fs/dlm/config.c:726: warning: initialization from incompatible pointer type
Cc: Christine Caulfield <ccaulfie@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Teigland <teigland@redhat.com>
Compare only the addr and port fields of sockaddr structures.
Fixes a problem with ipv6 where sin6_scope_id does not match.
Signed-off-by: David Teigland <teigland@redhat.com>
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 <teigland@redhat.com>
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 <teigland@redhat.com>
Add a dlm_ prefix to the struct names in config.c. This resolves a
conflict with struct node in particular, when include/linux/node.h
happens to be included.
Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Teigland <teigland@redhat.com>
A couple of unlikely error conditions were missing a kfree on the error
exit path.
Reported-by: Juha Leppanen <juha_motorsportcom@luukku.com>
Signed-off-by: David Teigland <teigland@redhat.com>
Jeff Layton
David Teigland
Linus Torvalds
Andrew Morton
Steven Whitehouse
Harvey Harrison
Ingo Molnar