Commit graph

284 commits

Author SHA1 Message Date
Linus Torvalds
0a4ebed781 Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2
* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2: (31 commits)
  ocfs2: avoid unaligned access to dqc_bitmap
  ocfs2: Use filemap_write_and_wait() instead of write_inode_now()
  ocfs2: honor O_(D)SYNC flag in fallocate
  ocfs2: Add a missing journal credit in ocfs2_link_credits() -v2
  ocfs2: send correct UUID to cleancache initialization
  ocfs2: Commit transactions in error cases -v2
  ocfs2: make direntry invalid when deleting it
  fs/ocfs2/dlm/dlmlock.c: free kmem_cache_zalloc'd data using kmem_cache_free
  ocfs2: Avoid livelock in ocfs2_readpage()
  ocfs2: serialize unaligned aio
  ocfs2: Implement llseek()
  ocfs2: Fix ocfs2_page_mkwrite()
  ocfs2: Add comment about orphan scanning
  ocfs2: Clean up messages in the fs
  ocfs2/cluster: Cluster up now includes network connections too
  ocfs2/cluster: Add new function o2net_fill_node_map()
  ocfs2/cluster: Fix output in file elapsed_time_in_ms
  ocfs2/dlm: dlmlock_remote() needs to account for remastery
  ocfs2/dlm: Take inflight reference count for remotely mastered resources too
  ocfs2/dlm: Cleanup dlm_wait_for_node_death() and dlm_wait_for_node_recovery()
  ...
2011-12-01 14:55:34 -08:00
Julia Lawall
fc9f899483 fs/ocfs2/dlm/dlmlock.c: free kmem_cache_zalloc'd data using kmem_cache_free
Memory allocated using kmem_cache_zalloc should be freed using
kmem_cache_free, not kfree.

The semantic patch that fixes this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x,e,e1,e2;
@@

x = kmem_cache_zalloc(e1,e2)
... when != x = e
?-kfree(x)
+kmem_cache_free(e1,x)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Joel Becker <jlbec@evilplan.org>
2011-11-17 01:46:46 -08:00
Paul Gortmaker
afeacc8c1f fs: add export.h to files using EXPORT_SYMBOL/THIS_MODULE macros
These files were getting <linux/module.h> via an implicit include
path, but we want to crush those out of existence since they cost
time during compiles of processing thousands of lines of headers
for no reason.  Give them the lightweight header that just contains
the EXPORT_SYMBOL infrastructure.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:30:31 -04:00
Sunil Mushran
6b27f62fc7 ocfs2/cluster: Cluster up now includes network connections too
The cluster up check only checks to see if the node is heartbeating or not.
If yes it continues assuming that the node is connected to all the nodes. But
if that is not the case, the cluster join aborts with a stack of errors that
are not easy to comprehend.

This patch adds the network connect check upfront and prints the nodes that
the node is not yet connected to, before aborting.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
2011-07-24 10:33:54 -07:00
Sunil Mushran
a2c0cc1579 ocfs2/dlm: dlmlock_remote() needs to account for remastery
In dlmlock_remote(), we wait for the resource to stop being active before
setting the inprogress flag. Active includes recovery, migration, etc.

The problem here is that if the resource was being recovered or migrated, the
new owner could very well be that node itself (and thus not a remote node).
This problem was observed in Oracle bug#12583620. The error messages observed
were as follows:

dlm_send_remote_lock_request:337 ERROR: Error -40 (ELOOP) when sending message 503 (key 0xd6d8c7) to node 2
dlmlock_remote:271 ERROR: dlm status = DLM_BADARGS
dlmlock:751 ERROR: dlm status = DLM_BADARGS

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
2011-07-24 10:30:54 -07:00
Sunil Mushran
ff0a522e7d ocfs2/dlm: Take inflight reference count for remotely mastered resources too
The inflight reference count, in the lock resource, is taken to pin the resource
in memory. We take it when a new resource is created and release it after a
lock is attached to it. We do this to prevent the resource from getting purged
prematurely.

Earlier this reference count was being taken for locally mastered resources
only. This patch extends the same functionality for remotely mastered ones.

We are doing this because the same premature purging could occur for remotely
mastered resources if the remote node were to die before completion of the
create lock.

Fix for Oracle bug#12405575.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
2011-07-24 10:29:54 -07:00
Sunil Mushran
ed8625c6fb ocfs2/dlm: Cleanup dlm_wait_for_node_death() and dlm_wait_for_node_recovery()
dlm_wait_for_node_death() and dlm_wait_for_node_recovery() needed a facelift.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
2011-07-24 10:28:54 -07:00
Sunil Mushran
e9f0b6a623 ocfs2/dlm: Trace insert/remove of resource to/from hash
Add mlog to trace adding and removing the resource from/to the hash table.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
2011-07-24 10:27:54 -07:00
Sunil Mushran
8d400b81cc ocfs2/dlm: Clean up refmap helpers
Patch cleans up helpers that set/clear refmap bits and grab/drop inflight lock
ref counts.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
2011-07-24 10:26:54 -07:00
Sunil Mushran
0afbba1322 ocfs2/dlm: Cleanup up dlm_finish_local_lockres_recovery()
dlm_finish_local_lockres_recovery() needed a facelift.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
2011-07-24 10:25:54 -07:00
Sunil Mushran
8decab3c8d ocfs2/dlm: Clean up messages in o2dlm
o2dlm messages needed a facelift.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
2011-07-24 10:23:54 -07:00
Sunil Mushran
66effd3c68 ocfs2/dlm: Do not migrate resource to a node that is leaving the domain
During dlm domain shutdown, o2dlm has to free all the lock resources. Ones that
have no locks and references are freed. Ones that have locks and/or references
are migrated to another node.

The first task in migration is finding a target. Currently we scan the lock
resource and find one node that either has a lock or a reference. This is not
very efficient in a parallel umount case as we might end up migrating the
lock resource to a node which itself may have to migrate it to a third node.

The patch scans the dlm->exit_domain_map to ensure the target node is not
leaving the domain. If no valid target node is found, o2dlm does not migrate
the resource but instead waits for the unlock and deref messages that will
allow it to free the resource.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <jlbec@evilplan.org>
2011-05-25 21:05:22 -07:00
Sunil Mushran
bddefdeec5 ocfs2/dlm: Add new dlm message DLM_BEGIN_EXIT_DOMAIN_MSG
This patch adds a new dlm message DLM_BEGIN_EXIT_DOMAIN_MSG and ups the dlm
protocol to 1.2.

o2dlm sends this new message in dlm_unregister_domain() to mark the beginning
of the exit domain. This message is sent to all nodes in the domain.

Currently o2dlm has no way of informing other nodes of its impending exit.
This information is useful as the other nodes could disregard the exiting
node in certain operations. For example, in resource migration. If two or
more nodes were umounting in parallel, it would be more efficient if o2dlm
were to choose a non-exiting node to be the new master node rather than an
exiting one.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Joel Becker <jlbec@evilplan.org>
2011-05-25 21:05:15 -07:00
Sunil Mushran
9f62e96084 ocfs2/dlm: dlm_is_lockres_migrateable() returns boolean
Patch cleans up the gunk added by commit 388c4bcb4e.
dlm_is_lockres_migrateable() now returns 1 if lockresource is deemed
migrateable and 0 if not.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <jlbec@evilplan.org>
2011-05-23 23:37:39 -07:00
Sunil Mushran
df016c665b ocfs2/dlm: Target node death during resource migration leads to thread spin
During resource migration, if the target node were to die, the thread doing
the migration spins until the target node is not removed from the domain map.
This patch slows the spin by making the thread wait for the recovery to kick in.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <jlbec@evilplan.org>
2011-05-13 11:27:30 -07:00
Sunil Mushran
4da6dc2936 ocfs2/dlm: Use negotiated o2dlm protocol version
Patch fixes a bug in the o2dlm protocol negotiation in that it is using
the builtin version rather than the negotiated version during the domain
join. This causes join errors when a node having kernel >= 2.6.37 joins
a cluster with nodes having kernels < 2.6.37.

This only affects the o2cb cluster stack.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Reported-by: Jacek Stepniewski <Jacek.Stepniewski@agora.pl>
Acked-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Joel Becker <jlbec@evilplan.org>
2011-05-13 11:26:37 -07:00
Lucas De Marchi
25985edced Fix common misspellings
Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2011-03-31 11:26:23 -03:00
Linus Torvalds
03e4970c10 Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2
* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2: (39 commits)
  Treat writes as new when holes span across page boundaries
  fs,ocfs2: Move o2net_get_func_run_time under CONFIG_OCFS2_FS_STATS.
  ocfs2/dlm: Move kmalloc() outside the spinlock
  ocfs2: Make the left masklogs compat.
  ocfs2: Remove masklog ML_AIO.
  ocfs2: Remove masklog ML_UPTODATE.
  ocfs2: Remove masklog ML_BH_IO.
  ocfs2: Remove masklog ML_JOURNAL.
  ocfs2: Remove masklog ML_EXPORT.
  ocfs2: Remove masklog ML_DCACHE.
  ocfs2: Remove masklog ML_NAMEI.
  ocfs2: Remove mlog(0) from fs/ocfs2/dir.c
  ocfs2: remove NAMEI from symlink.c
  ocfs2: Remove masklog ML_QUOTA.
  ocfs2: Remove mlog(0) from quota_local.c.
  ocfs2: Remove masklog ML_RESERVATIONS.
  ocfs2: Remove masklog ML_XATTR.
  ocfs2: Remove masklog ML_SUPER.
  ocfs2: Remove mlog(0) from fs/ocfs2/heartbeat.c
  ocfs2: Remove mlog(0) from fs/ocfs2/slot_map.c
  ...

Fix up trivial conflict in fs/ocfs2/super.c
2011-03-28 13:03:31 -07:00
Joel Becker
99bdc3880c Merge branch 'mlog_replace_for_39' of git://repo.or.cz/taoma-kernel into ocfs2-merge-window-fix 2011-03-28 09:44:26 -07:00
matt mooney
0ccd234ca0 fs: change to new flag variable
Replace EXTRA_CFLAGS with ccflags-y. And change ntfs-objs to ntfs-y
for cleaner conditional inclusion.

Signed-off-by: matt mooney <mfm@muteddisk.com>
Acked-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>
2011-03-17 14:02:57 +01:00
Sunil Mushran
770c4d81e0 ocfs2/dlm: Move kmalloc() outside the spinlock
In dlm_query_region_handler(), move the kmalloc outside the spinlock.
This allows us to use GFP_KERNEL instead of GFP_ATOMIC.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <jlbec@evilplan.org>
2011-02-22 01:35:30 -08:00
Tao Ma
c1e8d35ef5 ocfs2: Remove EXIT from masklog.
mlog_exit is used to record the exit status of a function.
But because it is added in so many functions, if we enable it,
the system logs get filled up quickly and cause too much I/O.
So actually no one can open it for a production system or even
for a test.

This patch just try to remove it or change it. So:
1. if all the error paths already use mlog_errno, it is just removed.
   Otherwise, it will be replaced by mlog_errno.
2. if it is used to print some return value, it is replaced with
   mlog(0,...).
mlog_exit_ptr is changed to mlog(0.
All those mlog(0,...) will be replaced with trace events later.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
2011-03-07 16:43:21 +08:00
Tao Ma
ef6b689b63 ocfs2: Remove ENTRY from masklog.
ENTRY is used to record the entry of a function.
But because it is added in so many functions, if we enable it,
the system logs get filled up quickly and cause too much I/O.
So actually no one can open it for a production system or even
for a test.

So for mlog_entry_void, we just remove it.
for mlog_entry(...), we replace it with mlog(0,...), and they
will be replace by trace event later.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
2011-02-21 11:10:44 +08:00
Linus Torvalds
498f7f505d Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2
* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2: (22 commits)
  MAINTAINERS: Update Joel Becker's email address
  ocfs2: Remove unused truncate function from alloc.c
  ocfs2/cluster: dereferencing before checking in nst_seq_show()
  ocfs2: fix build for OCFS2_FS_STATS not enabled
  ocfs2/cluster: Show o2net timing statistics
  ocfs2/cluster: Track process message timing stats for each socket
  ocfs2/cluster: Track send message timing stats for each socket
  ocfs2/cluster: Use ktime instead of timeval in struct o2net_sock_container
  ocfs2/cluster: Replace timeval with ktime in struct o2net_send_tracking
  ocfs2: Add DEBUG_FS dependency
  ocfs2/dlm: Hard code the values for enums
  ocfs2/dlm: Minor cleanup
  ocfs2/dlm: Cleanup dlmdebug.c
  ocfs2: Release buffer_head in case of error in ocfs2_double_lock.
  ocfs2/cluster: Pin the local node when o2hb thread starts
  ocfs2/cluster: Show pin state for each o2hb region
  ocfs2/cluster: Pin/unpin o2hb regions
  ocfs2/cluster: Remove dropped region from o2hb quorum region bitmap
  ocfs2/cluster: Pin the remote node item in configfs
  ocfs2/dlm: make existing convertion precedent over new lock
  ...
2011-01-11 11:28:34 -08:00
Linus Torvalds
eda4b716ea Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2
* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2:
  ocfs2: Fix system inodes cache overflow.
  ocfs2: Hold ip_lock when set/clear flags for indexed dir.
  ocfs2: Adjust masklog flag values
  Ocfs2: Teach 'coherency=full' O_DIRECT writes to correctly up_read i_alloc_sem.
  ocfs2/dlm: Migrate lockres with no locks if it has a reference
2010-12-23 16:36:48 -08:00
Sunil Mushran
079ffb743c ocfs2/dlm: Hard code the values for enums
In o2dlm, the enumerated message values are part of the protocol.
The patch hard codes each value so as to reduce the chance of an editing
error causing a protocol mismatch.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-12-22 18:34:46 -08:00
Sunil Mushran
37096a7927 ocfs2/dlm: Minor cleanup
Patch makes use of task_pid_nr(). Also removes the null check before calling
debugfs_remove().

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-12-22 18:34:45 -08:00
Sunil Mushran
02bd9c394e ocfs2/dlm: Cleanup dlmdebug.c
Remove struct debug_buffer in dlmdebug.c/h.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-12-22 18:34:44 -08:00
Sunil Mushran
58a3158a5d ocfs2/cluster: Pin/unpin o2hb regions
This patch adds support for pinning o2hb regions in configfs. Pinning disallows
a region to be cleanly stopped as long as it has an active dependent user
(read o2dlm).

In local heartbeat mode, the region uuid matching the domain name is pinned as
long as the o2dlm domain is active.

In global heartbeat mode, all regions are pinned as long as there is atleast
one dependent user and the region count is 3 or less. All regions are unpinned
if the number of dependent users is zero or region count is greater than 3.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-12-16 00:47:44 -08:00
Wengang Wang
66f4500573 ocfs2/dlm: make existing convertion precedent over new lock
Make existing convertion precedent over new lock. It makes o2dlm locking more
like fair locking.

Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-12-16 00:46:08 -08:00
Sunil Mushran
8e17d16f40 ocfs2/dlm: Cleanup mlogs in dlmthread.c, dlmast.c and dlmdomain.c
Add the domain name and the resource name in the mlogs.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-12-16 00:46:05 -08:00
Sunil Mushran
388c4bcb4e ocfs2/dlm: Migrate lockres with no locks if it has a reference
o2dlm was not migrating resources with zero locks because it assumed that that
resource would get purged by dlm_thread. However, some usage patterns involve
creating and dropping locks at a high rate leading to the migrate thread seeing
zero locks but the purge thread seeing an active reference. When this happens,
the dlm_thread cannot purge the resource and the migrate thread sees no reason
to migrate that resource. The spell is broken when the migrate thread catches
the resource with a lock.

The fix is to make the migrate thread also consider the reference map.

This usage pattern can be triggered by userspace on userdlm locks and flocks.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-12-09 15:36:00 -08:00
David Sterba
a48a982a6b fs/ocfs2/dlm: Use GFP_ATOMIC under spin_lock
coccinelle check scripts/coccinelle/locks/call_kern.cocci found that
in fs/ocfs2/dlm/dlmdomain.c an allocation with GFP_KERNEL is done
with locks held:

dlm_query_region_handler
  spin_lock(dlm_domain_lock)
    dlm_match_regions
      kmalloc(GFP_KERNEL)

Change it to GFP_ATOMIC.

Signed-off-by: David Sterba <dsterba@suse.cz>
CC: Joel Becker <joel.becker@oracle.com>
CC: Mark Fasheh <mfasheh@suse.com>
CC: ocfs2-devel@oss.oracle.com

--
Exists in v2.6.37-rc1 and current linux-next.
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-11-18 14:10:55 -08:00
Joel Becker
fc3718918f Merge branch 'globalheartbeat-2' of git://oss.oracle.com/git/smushran/linux-2.6 into ocfs2-merge-window
Conflicts:
	fs/ocfs2/ocfs2.h
2010-10-15 13:03:09 -07:00
Sunil Mushran
4d94aa1b1d ocfs2/cluster: Bump up dlm protocol to version 1.1
dlm protocol 1.1. activates messages DLM_QUERY_REGION and DLM_QUERY_NODEINFO
that are a must for global heartbeat.

It also activates o2hb_global_heartbeat_active().

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
2010-10-09 10:27:04 -07:00
Sunil Mushran
18cfdf1b1a ocfs2/dlm: Add message DLM_QUERY_NODEINFO
Adds new dlm message DLM_QUERY_NODEINFO that sends the attributes of all
registered nodes. This message is sent if the negotiated dlm protocol is
1.1 or higher. If the information of the joining node does not match
that of any existing nodes, the join domain request is rejected.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
2010-10-07 16:47:03 -07:00
Sunil Mushran
ea2034416b ocfs2/dlm: Add message DLM_QUERY_REGION
Adds new dlm message DLM_QUERY_REGION that sends the names of all active
heartbeat regions. This message is only sent in the global heartbeat
mode. If the regions in the joining node do not fully match the ones in
the active nodes, the join domain request is rejected.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
2010-10-09 10:26:23 -07:00
Sunil Mushran
b1365d0bd1 ocfs2/dlm: Expose dlm_protocol in dlm_state
Add dlm_protocol to the list of info shown by the debugfs file, dlm_state.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
2010-10-06 17:55:34 -07:00
Srinivas Eeda
5dad6c39d1 o2dlm: force free mles during dlm exit
While umounting, a block mle doesn't get freed if dlm is shutdown after
master request is received but before assert master. This results in unclean
shutdown of dlm domain.

This patch frees all mles that lie around after other nodes were notified about
exiting the dlm and marking dlm state as leaving. Only block mles are expected
to be around, so we log ERROR for other mles but still free them.

Signed-off-by: Srinivas Eeda <srinivas.eeda@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-09-23 14:16:53 -07:00
Joel Becker
93f3b86fb1 ocfs2: Initialize the bktcnt variable properly, and call it bucket_count
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-09-15 17:00:58 -07:00
Tristan Ye
228ac63577 Ocfs2: Handle empty list in lockres_seq_start() for dlmdebug.c
This patch tries to handle the case in which list 'dlm->tracking_list' is
empty, to avoid accessing an invalid pointer. It fixes the following oops:

http://oss.oracle.com/bugzilla/show_bug.cgi?id=1287

Signed-off-by: Tristan Ye <tristan.ye@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-09-10 09:19:30 -07:00
Linus Torvalds
a30bfd6cd4 Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2
* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2:
  O2net: Disallow o2net accept connection request from itself.
  ocfs2/dlm: remove potential deadlock -V3
  ocfs2/dlm: avoid incorrect bit set in refmap on recovery master
  Fix the nested PR lock calling issue in ACL
  ocfs2: Count more refcount records in file system fragmentation.
  ocfs2 fix o2dlm dlm run purgelist (rev 3)
  ocfs2/dlm: fix a dead lock
  ocfs2: do not overwrite error codes in ocfs2_init_acl
2010-08-13 10:43:50 -07:00
Wengang Wang
b11f1f1ab7 ocfs2/dlm: remove potential deadlock -V3
When we need to take both dlm_domain_lock and dlm->spinlock, we should take
them in order of: dlm_domain_lock then dlm->spinlock.

There is pathes disobey this order. That is calling dlm_lockres_put() with
dlm->spinlock held in dlm_run_purge_list. dlm_lockres_put() calls dlm_put() at
the ref and dlm_put() locks on dlm_domain_lock.

Fix:
Don't grab/put the dlm when the initialising/releasing lockres.
That grab is not required because we don't call dlm_unregister_domain()
based on refcount.

Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Cc: stable@kernel.org
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-08-07 10:50:30 -07:00
Wengang Wang
a524812b7e ocfs2/dlm: avoid incorrect bit set in refmap on recovery master
In the following situation, there remains an incorrect bit in refmap on the
recovery master. Finally the recovery master will fail at purging the lockres
due to the incorrect bit in refmap.

1) node A has no interest on lockres A any longer, so it is purging it.
2) the owner of lockres A is node B, so node A is sending de-ref message
to node B.
3) at this time, node B crashed. node C becomes the recovery master. it recovers
lockres A(because the master is the dead node B).
4) node A migrated lockres A to node C with a refbit there.
5) node A failed to send de-ref message to node B because it crashed. The failure
is ignored. no other action is done for lockres A any more.

For mormal, re-send the deref message to it to recovery master can fix it. Well,
ignoring the failure of deref to the original master and not recovering the lockres
to recovery master has the same effect. And the later is simpler.

Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Acked-by: Srinivas Eeda <srinivas.eeda@oracle.com>
Cc: stable@kernel.org
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-08-07 10:49:41 -07:00
Srinivas Eeda
7beaf24378 ocfs2 fix o2dlm dlm run purgelist (rev 3)
This patch fixes two problems in dlm_run_purgelist

1. If a lockres is found to be in use, dlm_run_purgelist keeps trying to purge
the same lockres instead of trying the next lockres.

2. When a lockres is found unused, dlm_run_purgelist releases lockres spinlock
before setting DLM_LOCK_RES_DROPPING_REF and calls dlm_purge_lockres.
spinlock is reacquired but in this window lockres can get reused. This leads
to BUG.

This patch modifies dlm_run_purgelist to skip lockres if it's in use and purge
 next lockres. It also sets DLM_LOCK_RES_DROPPING_REF before releasing the
lockres spinlock protecting it from getting reused.

Signed-off-by: Srinivas Eeda <srinivas.eeda@oracle.com>
Acked-by: Sunil Mushran <sunil.mushran@oracle.com>
Cc: stable@kernel.org
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-08-07 10:44:40 -07:00
Wengang Wang
6d98c3ccb5 ocfs2/dlm: fix a dead lock
When we have to take both dlm->master_lock and lockres->spinlock,
take them in order

lockres->spinlock and then dlm->master_lock.

The patch fixes a violation of the rule.
We can simply move taking dlm->master_lock to where we have dropped res->spinlock
since when we access res->state and free mle memory we don't need master_lock's
protection.

Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Cc: stable@kernel.org
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-08-07 10:44:20 -07:00
Jiri Kosina
d790d4d583 Merge branch 'master' into for-next 2010-08-04 15:14:38 +02:00
Joe Perches
33fa1d909c fs/ocfs2: Remove unnecessary casts of private_data
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2010-07-20 17:20:08 +02:00
Wengang Wang
a39953dd95 ocfs2/dlm: Remove BUG_ON from migration in the rare case of a down node
For migration, we are waiting for DLM_LOCK_RES_MIGRATING flag to be set
before sending DLM_MIG_LOCKRES_MSG message to the target. We are using
dlm_migration_can_proceed() for that purpose.  However, if the node is
down, dlm_migration_can_proceed() will also return "go ahead".  In this
rare case, the DLM_LOCK_RES_MIGRATING flag might not be set yet. Remove
the BUG_ON() that trips over this condition.

Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-07-15 10:56:30 -07:00
Dan Carpenter
e372357ba5 ocfs2: tighten up strlen() checking
This function is only called from one place and it's like this:
	dlm_register_domain(conn->cc_name, dlm_key, &fs_version);

The "conn->cc_name" is 64 characters long.  If strlen(conn->cc_name)
were equal to O2NM_MAX_NAME_LEN (64) that would be a bug because
strlen() doesn't count the NULL character.

In fact, if you look how O2NM_MAX_NAME_LEN is used, it mostly describes
64 character buffers.  The only exception is nd_name from struct
o2nm_node.

Anyway I looked into it and in this case the domain string comes from
osb->uuid_str in ocfs2_setup_osb_uuid().  That's 32 characters and NULL
which easily fits into O2NM_MAX_NAME_LEN.  This patch doesn't change how
the code works, but I think it makes the code a little cleaner.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
2010-07-12 13:57:53 -07:00