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void-packages/srcpkgs/lvm2/patches/lvm2-2_02_99-add-dm-disable...

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commit 03ed86585e1bfbaf5df1e3488b6268b8887ca427
Author: Peter Rajnoha <prajnoha@redhat.com>
Date: Tue May 14 11:17:52 2013 +0200
lvm2-2_02_99-add-dm-disable-udev-env-var-and-fix-noudevsync-arg.patch
---
WHATS_NEW | 2 ++
WHATS_NEW_DM | 1 +
lib/commands/toolcontext.c | 62 ++++++++++++++++++++++++++++++++++------------
libdm/libdm-common.c | 43 ++++++++++++++++++++++++++------
tools/lvmcmdline.c | 4 +--
5 files changed, 86 insertions(+), 26 deletions(-)
diff --git a/WHATS_NEW b/WHATS_NEW
index 1bdfeb0..8516f40 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,7 @@
Version 2.02.99 -
===================================
+ Recognize DM_DISABLE_UDEV environment variable for a complete fallback.
+ Do not verify udev operations if --noudevsync command option is used.
Fix blkdeactivate to handle nested mountpoints and mangled mount paths.
Fix a crash-inducing race condition in lvmetad while updating metadata.
Fix possible race while removing metadata from lvmetad.
diff --git a/WHATS_NEW_DM b/WHATS_NEW_DM
index e0b8d51..9574fdf 100644
--- a/WHATS_NEW_DM
+++ b/WHATS_NEW_DM
@@ -1,5 +1,6 @@
Version 1.02.78 -
===================================
+ Add DM_DISABLE_UDEV environment variable to manage dev nodes by libdm only.
Automatically deactivate failed preloaded dm tree node.
Fix dm_task_set_cookie to properly process udev flags if udev_sync disabled.
diff --git a/lib/commands/toolcontext.c b/lib/commands/toolcontext.c
index eb1a90b..80d0f3e 100644
--- a/lib/commands/toolcontext.c
+++ b/lib/commands/toolcontext.c
@@ -211,6 +211,21 @@ static void _init_logging(struct cmd_context *cmd)
reset_lvm_errno(1);
}
+static int _check_disable_udev(const char *msg) {
+ if (getenv("DM_DISABLE_UDEV")) {
+ log_very_verbose("DM_DISABLE_UDEV environment variable set. "
+ "Overriding configuration to use "
+ "udev_rules=0, udev_sync=0, verify_udev_operations=1.");
+ if (udev_is_running())
+ log_warn("Udev is running and DM_DISABLE_UDEV environment variable is set. "
+ "Bypassing udev, LVM will %s.", msg);
+
+ return 1;
+ }
+
+ return 0;
+}
+
#ifdef UDEV_SYNC_SUPPORT
/*
* Until the DM_UEVENT_GENERATED_FLAG was introduced in kernel patch
@@ -237,6 +252,7 @@ static int _process_config(struct cmd_context *cmd)
const struct dm_config_value *cv;
int64_t pv_min_kb;
const char *lvmetad_socket;
+ int udev_disabled = 0;
/* umask */
cmd->default_settings.umask = find_config_tree_int(cmd,
@@ -310,13 +326,20 @@ static int _process_config(struct cmd_context *cmd)
return 0;
}
- cmd->default_settings.udev_rules = find_config_tree_int(cmd,
- "activation/udev_rules",
- DEFAULT_UDEV_RULES);
+ /*
+ * If udev is disabled using DM_DISABLE_UDEV environment
+ * variable, override existing config and hardcode these:
+ * - udev_rules = 0
+ * - udev_sync = 0
+ * - udev_fallback = 1
+ */
+ udev_disabled = _check_disable_udev("manage logical volume symlinks in device directory");
- cmd->default_settings.udev_sync = find_config_tree_int(cmd,
- "activation/udev_sync",
- DEFAULT_UDEV_SYNC);
+ cmd->default_settings.udev_rules = udev_disabled ? 0 :
+ find_config_tree_int(cmd, "activation/udev_rules", DEFAULT_UDEV_RULES);
+
+ cmd->default_settings.udev_sync = udev_disabled ? 0 :
+ find_config_tree_int(cmd, "activation/udev_sync", DEFAULT_UDEV_SYNC);
init_retry_deactivation(find_config_tree_int(cmd, "activation/retry_deactivation",
DEFAULT_RETRY_DEACTIVATION));
@@ -326,14 +349,12 @@ static int _process_config(struct cmd_context *cmd)
#ifdef UDEV_SYNC_SUPPORT
/*
- * We need udev rules to be applied, otherwise we would end up with no
- * nodes and symlinks! However, we can disable the synchronization itself
- * in runtime and still have only udev to create the nodes and symlinks
- * without any fallback.
+ * Use udev fallback automatically in case udev
+ * is disabled via DM_DISABLE_UDEV environment
+ * variable or udev rules are switched off.
*/
- cmd->default_settings.udev_fallback = cmd->default_settings.udev_rules ?
- find_config_tree_int(cmd, "activation/verify_udev_operations",
- DEFAULT_VERIFY_UDEV_OPERATIONS) : 1;
+ cmd->default_settings.udev_fallback = !cmd->default_settings.udev_rules || udev_disabled ? 1 :
+ find_config_tree_int(cmd, "activation/verify_udev_operations", DEFAULT_VERIFY_UDEV_OPERATIONS);
/* Do not rely fully on udev if the udev support is known to be incomplete. */
if (!cmd->default_settings.udev_fallback && !_dm_driver_has_stable_udev_support()) {
@@ -693,9 +714,18 @@ static int _init_dev_cache(struct cmd_context *cmd)
if (!dev_cache_init(cmd))
return_0;
- device_list_from_udev = udev_is_running() ?
- find_config_tree_bool(cmd, "devices/obtain_device_list_from_udev",
- DEFAULT_OBTAIN_DEVICE_LIST_FROM_UDEV) : 0;
+ /*
+ * Override existing config and hardcode device_list_from_udev = 0 if:
+ * - udev is not running
+ * - udev is disabled using DM_DISABLE_UDEV environment variable
+ */
+ if (_check_disable_udev("obtain device list by scanning device directory"))
+ device_list_from_udev = 0;
+ else
+ device_list_from_udev = udev_is_running() ?
+ find_config_tree_bool(cmd, "devices/obtain_device_list_from_udev",
+ DEFAULT_OBTAIN_DEVICE_LIST_FROM_UDEV) : 0;
+
init_obtain_device_list_from_udev(device_list_from_udev);
if (!(cn = find_config_tree_node(cmd, "devices/scan"))) {
diff --git a/libdm/libdm-common.c b/libdm/libdm-common.c
index afdac89..075fba8 100644
--- a/libdm/libdm-common.c
+++ b/libdm/libdm-common.c
@@ -74,6 +74,8 @@ static dm_string_mangling_t _name_mangling_mode = DEFAULT_DM_NAME_MANGLING;
static struct selabel_handle *_selabel_handle = NULL;
#endif
+static int _udev_disabled = 0;
+
#ifdef UDEV_SYNC_SUPPORT
static int _semaphore_supported = -1;
static int _udev_running = -1;
@@ -85,6 +87,9 @@ void dm_lib_init(void)
{
const char *env;
+ if ((env = getenv("DM_DISABLE_UDEV")))
+ _udev_disabled = 1;
+
env = getenv(DM_DEFAULT_NAME_MANGLING_MODE_ENV_VAR_NAME);
if (env && *env) {
if (!strcasecmp(env, "none"))
@@ -1814,6 +1819,26 @@ out:
return r;
}
+static void _set_cookie_flags(struct dm_task *dmt, uint16_t flags)
+{
+ if (!dm_cookie_supported())
+ return;
+
+ if (_udev_disabled) {
+ /*
+ * If udev is disabled, hardcode this functionality:
+ * - we want libdm to create the nodes
+ * - we don't want the /dev/mapper and any subsystem
+ * related content to be created by udev if udev
+ * rules are installed
+ */
+ flags &= ~DM_UDEV_DISABLE_LIBRARY_FALLBACK;
+ flags |= DM_UDEV_DISABLE_DM_RULES_FLAG | DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG;
+ }
+
+ dmt->event_nr = flags << DM_UDEV_FLAGS_SHIFT;
+}
+
#ifndef UDEV_SYNC_SUPPORT
void dm_udev_set_sync_support(int sync_with_udev)
{
@@ -1835,8 +1860,8 @@ int dm_udev_get_checking(void)
int dm_task_set_cookie(struct dm_task *dmt, uint32_t *cookie, uint16_t flags)
{
- if (dm_cookie_supported())
- dmt->event_nr = flags << DM_UDEV_FLAGS_SHIFT;
+ _set_cookie_flags(dmt, flags);
+
*cookie = 0;
dmt->cookie_set = 1;
@@ -1908,8 +1933,13 @@ static void _check_udev_sync_requirements_once(void)
if (_semaphore_supported < 0)
_semaphore_supported = _check_semaphore_is_supported();
- if (_udev_running < 0)
+ if (_udev_running < 0) {
_udev_running = _check_udev_is_running();
+ if (_udev_disabled && _udev_running)
+ log_warn("Udev is running and DM_DISABLE_UDEV environment variable is set. "
+ "Bypassing udev, device-mapper library will manage device "
+ "nodes in device directory.");
+ }
}
void dm_udev_set_sync_support(int sync_with_udev)
@@ -1922,8 +1952,8 @@ int dm_udev_get_sync_support(void)
{
_check_udev_sync_requirements_once();
- return _semaphore_supported && dm_cookie_supported() &&
- _udev_running && _sync_with_udev;
+ return !_udev_disabled && _semaphore_supported &&
+ dm_cookie_supported() &&_udev_running && _sync_with_udev;
}
void dm_udev_set_checking(int checking)
@@ -2203,8 +2233,7 @@ int dm_task_set_cookie(struct dm_task *dmt, uint32_t *cookie, uint16_t flags)
{
int semid;
- if (dm_cookie_supported())
- dmt->event_nr = flags << DM_UDEV_FLAGS_SHIFT;
+ _set_cookie_flags(dmt, flags);
if (!dm_udev_get_sync_support()) {
*cookie = 0;
diff --git a/tools/lvmcmdline.c b/tools/lvmcmdline.c
index 39a8c58..652d57e 100644
--- a/tools/lvmcmdline.c
+++ b/tools/lvmcmdline.c
@@ -901,10 +901,8 @@ static int _get_settings(struct cmd_context *cmd)
} else
init_trust_cache(0);
- if (arg_count(cmd, noudevsync_ARG)) {
+ if (arg_count(cmd, noudevsync_ARG))
cmd->current_settings.udev_sync = 0;
- cmd->current_settings.udev_fallback = 1;
- }
/* Handle synonyms */
if (!_merge_synonym(cmd, resizable_ARG, resizeable_ARG) ||
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