Commit Graph

229 Commits

Author SHA1 Message Date
David Teigland
dc68c7ed36 dlm: detect available userspace daemon
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>
2008-08-28 11:49:43 -05:00
David Teigland
0f8e0d9a31 dlm: allow multiple lockspace creates
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>
2008-08-28 11:49:15 -05:00
David Teigland
51409340d2 dlm: rename structs
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>
2008-08-13 12:47:36 -05:00
David Teigland
cb980d9a3e dlm: add missing kfrees
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>
2008-08-13 12:47:36 -05:00
Linus Torvalds
3988ba0708 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm:
  dlm: fix uninitialized variable for search_rsb_list callers
  dlm: release socket on error
  dlm: fix basts for granted CW waiting PR/CW
  dlm: check for null in device_write
2008-07-28 09:46:00 -07:00
Miklos Szeredi
bde74e4bc6 locks: add special return value for asynchronous locks
Use a special error value FILE_LOCK_DEFERRED to mean that a locking
operation returned asynchronously.  This is returned by

  posix_lock_file() for sleeping locks to mean that the lock has been
  queued on the block list, and will be woken up when it might become
  available and needs to be retried (either fl_lmops->fl_notify() is
  called or fl_wait is woken up).

  f_op->lock() to mean either the above, or that the filesystem will
  call back with fl_lmops->fl_grant() when the result of the locking
  operation is known.  The filesystem can do this for sleeping as well
  as non-sleeping locks.

This is to make sure, that return values of -EAGAIN and -EINPROGRESS by
filesystems are not mistaken to mean an asynchronous locking.

This also makes error handling in fs/locks.c and lockd/svclock.c slightly
cleaner.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: David Teigland <teigland@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-25 10:53:47 -07:00
Joel Becker
a6795e9ebb configfs: Allow ->make_item() and ->make_group() to return detailed errors.
The configfs operations ->make_item() and ->make_group() currently
return a new item/group.  A return of NULL signifies an error.  Because
of this, -ENOMEM is the only return code bubbled up the stack.

Multiple folks have requested the ability to return specific error codes
when these operations fail.  This patch adds that ability by changing the
->make_item/group() ops to return ERR_PTR() values.  These errors are
bubbled up appropriately.  NULL returns are changed to -ENOMEM for
compatibility.

Also updated are the in-kernel users of configfs.

This is a rework of reverted commit 11c3b79218.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
2008-07-17 15:21:29 -07:00
Joel Becker
f89ab8619e Revert "configfs: Allow ->make_item() and ->make_group() to return detailed errors."
This reverts commit 11c3b79218.  The code
will move to PTR_ERR().

Signed-off-by: Joel Becker <joel.becker@oracle.com>
2008-07-17 14:53:48 -07:00
Linus Torvalds
5b664cb235 Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfasheh/ocfs2
* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfasheh/ocfs2:
  [PATCH] ocfs2: fix oops in mmap_truncate testing
  configfs: call drop_link() to cleanup after create_link() failure
  configfs: Allow ->make_item() and ->make_group() to return detailed errors.
  configfs: Fix failing mkdir() making racing rmdir() fail
  configfs: Fix deadlock with racing rmdir() and rename()
  configfs: Make configfs_new_dirent() return error code instead of NULL
  configfs: Protect configfs_dirent s_links list mutations
  configfs: Introduce configfs_dirent_lock
  ocfs2: Don't snprintf() without a format.
  ocfs2: Fix CONFIG_OCFS2_DEBUG_FS #ifdefs
  ocfs2/net: Silence build warnings on sparc64
  ocfs2: Handle error during journal load
  ocfs2: Silence an error message in ocfs2_file_aio_read()
  ocfs2: use simple_read_from_buffer()
  ocfs2: fix printk format warnings with OCFS2_FS_STATS=n
  [PATCH 2/2] ocfs2: Instrument fs cluster locks
  [PATCH 1/2] ocfs2: Add CONFIG_OCFS2_FS_STATS config option
2008-07-17 10:55:51 -07:00
Jonathan Corbet
2fceef397f Merge commit 'v2.6.26' into bkl-removal 2008-07-14 15:29:34 -06:00
Joel Becker
11c3b79218 configfs: Allow ->make_item() and ->make_group() to return detailed errors.
The configfs operations ->make_item() and ->make_group() currently
return a new item/group.  A return of NULL signifies an error.  Because
of this, -ENOMEM is the only return code bubbled up the stack.

Multiple folks have requested the ability to return specific error codes
when these operations fail.  This patch adds that ability by changing the
->make_item/group() ops to return an int.

Also updated are the in-kernel users of configfs.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
2008-07-14 13:57:16 -07:00
Benny Halevy
18c60c0a3b dlm: fix uninitialized variable for search_rsb_list callers
gcc 4.3.0 correctly emits the following warning.
search_rsb_list does not *r_ret if no dlm_rsb is found
and _search_rsb may pass the uninitialized value upstream
on the error path when both calls to search_rsb_list
return non-zero error.

The fix sets *r_ret to NULL on search_rsb_list's not-found path.

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-07-14 13:56:59 -05:00
Masatake YAMATO
311f6fc77c dlm: release socket on error
It seems that `sock' allocated by sock_create_kern in
tcp_connect_to_sock() of dlm/fs/lowcomms.c is not released if
dlm_nodeid_to_addr an error.

Acked-by: Christine Caulfield <ccaulfie@redhat.com>
Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-07-14 13:56:59 -05:00
David Teigland
329fc4c372 dlm: fix basts for granted CW waiting PR/CW
The fix in commit 3650925893 was addressing
the case of a granted PR lock with waiting PR and CW locks.  It's a
special case that requires forcing a CW bast.  However, that forced CW
bast was incorrectly applying to a second condition where the granted
lock was CW.  So, the holder of a CW lock could receive an extraneous CW
bast instead of a PR bast.  This fix narrows the original special case to
what was intended.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-07-14 13:56:59 -05:00
Masatake YAMATO
254ae43ab8 dlm: check for null in device_write
If `device_write' method is called via "dlm-control",
file->private_data is NULL. (See ctl_device_open() in
user.c. ) Through proc->flags is read.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-07-14 13:56:59 -05:00
Arnd Bergmann
514bcc66d4 dlm-user: BKL pushdown
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2008-06-20 14:05:56 -06:00
David Teigland
817d10bad5 dlm: fix plock dev_write return value
The return value on writes to the plock device should be
the number of bytes written.  It was returning 0 instead
when an nfs lock callback was involved.

Reported-by: Nathan Straz <nstraz@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-05-19 15:37:27 -05:00
Marcin Slusarz
0035a4b149 dlm: tcp_connect_to_sock should check for -EINVAL, not EINVAL
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Christine Caulfield <ccaulfie@redhat.com>
Cc: David Teigland <teigland@redhat.com>
Cc: cluster-devel@redhat.com
Signed-off-by: David Teigland <teigland@redhat.com>
2008-05-19 15:37:27 -05:00
Leonardo Potenza
88ad23195e dlm: section mismatch warning fix
Removed the section mismatch message:
WARNING: fs/dlm/dlm.o(.init.text+0x132): Section mismatch in reference from the function init_module() to the function .exit.text:dlm_netlink_exit()

Since dlm_netlink_exit() is called in the init_dlm() error handling,
the __exit annotation has been removed.

Signed-off-by: Leonardo Potenza <lpotenza@inwind.it>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-05-19 15:37:27 -05:00
Matthias Kaehlcke
7a936ce71e dlm: convert connections_lock in a mutex
The semaphore connections_lock is used as a mutex.  Convert it to the mutex
API.

Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Cc: Christine Caulfield <ccaulfie@redhat.com>
Cc: David Teigland <teigland@redhat.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-05-19 15:37:27 -05:00
Harvey Harrison
8e24eea728 fs: replace remaining __FUNCTION__ occurrences
__FUNCTION__ is gcc-specific, use __func__

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-30 08:29:54 -07:00
Linus Torvalds
03b883840c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm:
  dlm: linux/{dlm,dlm_device}.h: cleanup for userspace
  dlm: common max length definitions
  dlm: move plock code from gfs2
  dlm: recover nodes that are removed and re-added
  dlm: save master info after failed no-queue request
  dlm: make dlm_print_rsb() static
  dlm: match signedness between dlm_config_info and cluster_set
2008-04-22 13:44:23 -07:00
David Teigland
3d564fa347 dlm: common max length definitions
Add central definitions for max lockspace name length and max resource
name length.  The lack of central definitions has resulted in scattered
private definitions which we can now clean up, including an unused one
in dlm_device.h.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-04-21 11:22:29 -05:00
David Teigland
2402211a83 dlm: move plock code from gfs2
Move the code that handles cluster posix locks from gfs2 into the dlm
so that it can be used by both gfs2 and ocfs2.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-04-21 11:22:28 -05:00
David Teigland
d44e0fc704 dlm: recover nodes that are removed and re-added
If a node is removed from a lockspace, and then added back before the
dlm is notified of the removal, the dlm will not detect the removal
and won't clear the old state from the node.  This is fixed by using a
list of added nodes so the membership recovery can detect when a newly
added node is already in the member list.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-04-21 11:18:01 -05:00
David Teigland
761b9d3ffc dlm: save master info after failed no-queue request
When a NOQUEUE request fails, the rsb res_master field is unnecessarily
reset to -1, instead of leaving the valid master setting in place.  We
want to save the looked-up master values while the rsb is on the "toss
list" so that another lookup can be avoided if the rsb is soon reused.
The fix is to simply leave res_master value alone.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-04-21 11:18:01 -05:00
Adrian Bunk
170e19ab29 dlm: make dlm_print_rsb() static
dlm_print_rsb() can now become static.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-04-21 11:18:01 -05:00
Harvey Harrison
5416b704ae dlm: match signedness between dlm_config_info and cluster_set
cluster_set is only called from the macro CLUSTER_ATTR which defines read/write
access functions.  Make the signedness match to avoid sparse warnings every time
CLUSTER_ATTR is used (lines 149-159) all of the form:

fs/dlm/config.c:149:1: warning: incorrect type in argument 3 (different signedness)
fs/dlm/config.c:149:1:    expected unsigned int *info_field
fs/dlm/config.c:149:1:    got int extern [toplevel] *<noident>

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-04-21 11:18:01 -05:00
Matthew Wilcox
cb688371e2 fs: Remove unnecessary inclusions of asm/semaphore.h
None of these files use any of the functionality promised by
asm/semaphore.h.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
2008-04-18 22:16:44 -04:00
David Teigland
599e0f584d dlm: fix rcom_names message to self
The recent patch to validate data lengths in rcom_names messages
failed to account for fake messages a node directs to itself before
ever sending it.  In this case we need to fill in the message length
in the header for the validation code to use.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-21 15:19:54 -06:00
Denis Cheng
30727174b6 dlm: add __init and __exit marks to init and exit functions
it moves 365 bytes from .text to .init.text, and 30 bytes from .text to
.exit.text, saves memory.

Signed-off-by: Denis Cheng <crquan@gmail.com>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-06 23:41:22 -06:00
David Teigland
d292c0cc48 dlm: eliminate astparam type casting
Put lkb_astparam in a union with a dlm_user_args pointer to
eliminate a lot of type casting.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-06 23:27:04 -06:00
David Teigland
e5dae548b0 dlm: proper types for asts and basts
Use proper types for ast and bast functions, and use
consistent type for ast param.

Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-06 00:35:45 -06:00
Al Viro
cb79f1998d dlm: dlm/user.c input validation fixes
a) in device_write(): add sentinel NUL byte, making sure that lspace.name will
be NUL-terminated
b) in compat_input() be keep it simple about the amounts of data we are copying.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-04 01:30:19 -06:00
Al Viro
043b19cdc0 dlm: fix dlm_dir_lookup() handling of too long names
... those can happen and BUG() from DLM_ASSERT() in allocate_direntry() is
not a good way to handle them.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-04 01:30:19 -06:00
Al Viro
a9cc915928 dlm: fix overflows when copying from ->m_extra to lvb
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-04 01:29:13 -06:00
Al Viro
ef58bccab7 dlm: make find_rsb() fail gracefully when namelen is too large
We *can* get there from receive_request() and dlm_recover_master_copy()
with namelen too large if incoming request is invalid; BUG() from
DLM_ASSERT() in allocate_rsb() is a bit excessive reaction to that
and in case of dlm_recover_master_copy() we would actually oops before
that while calculating hash of up to 64Kb worth of data - with data
actually being 64 _bytes_ in kmalloc()'ed struct.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-04 01:26:31 -06:00
Al Viro
a5dd06313d dlm: receive_rcom_lock_args() overflow check
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-04 01:25:58 -06:00
Al Viro
ae773d0b74 dlm: verify that places expecting rcom_lock have packet long enough
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-04 01:25:09 -06:00
Al Viro
cd9df1aac3 dlm: validate data in dlm_recover_directory()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-04 01:24:52 -06:00
Al Viro
02ed16b64d dlm: missing length check in check_config()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-04 01:24:20 -06:00
Al Viro
4007685c6e dlm: use proper type for ->ls_recover_buf
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-04 01:24:07 -06:00
Al Viro
93ff2971e9 dlm: do not byteswap rcom_config
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-04 01:23:43 -06:00
Al Viro
163a1859ec dlm: do not byteswap rcom_lock
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-04 01:23:14 -06:00
Al Viro
eef7d739c2 dlm: dlm_process_incoming_buffer() fixes
* check that length is large enough to cover the non-variable part of message or
  rcom resp. (after checking that it's large enough to cover the header, of
  course).

* kill more pointless casts

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-04 01:22:42 -06:00
Al Viro
8b0d8e03f8 dlm: use proper C for dlm/requestqueue stuff (and fix alignment bug)
a) don't cast the pointer to dlm_header *, we use it as dlm_message *
   anyway.
b) we copy the message into a queue element, then pass the pointer to
   copy to dlm_receive_message_saved(); declare it properly to make sure
   that we have the right alignment.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>
2008-02-04 01:21:32 -06:00
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