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Add check for kernel semaphore support and disable udev_sync if not available.

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udev_sync feature requires semaphores (part of System V IPC) to be configured
in kernel (CONFIG_SYSVIPC). Check whether it is supported and if not, give
a warning message and disable udev synchronisation code automatically to
avoid any further error states and associated problems.

One should use the kernel with System V IPC support enabled or libdevmapper
with udev_sync feature disabled.
This commit is contained in:
Peter Rajnoha 2010-08-03 07:56:03 +00:00
parent cbd41292a4
commit d87427446c
2 changed files with 30 additions and 4 deletions
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1
WHATS_NEW_DM
View File

@ -1,5 +1,6 @@
Version 1.02.54 -
================================
Add check for kernel semaphore support and disable udev_sync if not available.
Version 1.02.53 - 28th July 2010
================================

33
libdm/libdm-common.c
View File

@ -60,6 +60,7 @@ static char _dm_dir[PATH_MAX] = DEV_DIR DM_DIR;
static int _verbose = 0;
#ifdef UDEV_SYNC_SUPPORT
static int _semaphore_supported = -1;
static int _udev_running = -1;
static int _sync_with_udev = 1;
static int _udev_checking = 1;
@ -929,6 +930,23 @@ int dm_udev_wait(uint32_t cookie)
#else /* UDEV_SYNC_SUPPORT */
static int _check_semaphore_is_supported()
{
int maxid;
union semun arg;
struct seminfo seminfo;
arg.__buf = &seminfo;
maxid = semctl(0, 0, SEM_INFO, arg);
if (maxid < 0) {
log_warn("Kernel not configured for semaphores (System V IPC). "
"Not using udev synchronisation code.");
return 0;
}
return 1;
}
static int _check_udev_is_running(void)
{
@ -958,20 +976,27 @@ bad:
return 0;
}
void dm_udev_set_sync_support(int sync_with_udev)
static void _check_udev_sync_requirements_once()
{
if (_semaphore_supported < 0)
_semaphore_supported = _check_semaphore_is_supported();
if (_udev_running < 0)
_udev_running = _check_udev_is_running();
}
void dm_udev_set_sync_support(int sync_with_udev)
{
_check_udev_sync_requirements_once();
_sync_with_udev = sync_with_udev;
}
int dm_udev_get_sync_support(void)
{
if (_udev_running < 0)
_udev_running = _check_udev_is_running();
_check_udev_sync_requirements_once();
return dm_cookie_supported() && _udev_running && _sync_with_udev;
return _semaphore_supported && dm_cookie_supported() &&
_udev_running && _sync_with_udev;
}
void dm_udev_set_checking(int checking)