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Add framework for validation of ioctls. Doesn't do any checks yet.

Browse Source 
dmsetup --checks
libdevmapper: dm_task_enable_checks()
lvm.conf: activation/checks=1
This commit is contained in:
Alasdair Kergon 2011-07-01 14:09:19 +00:00
parent b3c42d7cc1
commit 2243718fae
16 changed files with 119 additions and 4 deletions
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1
WHATS_NEW
View File

@ -1,5 +1,6 @@
Version 2.02.86 -
=================================
Add activation/checks to lvm.conf to perform additional ioctl validation.
When suspending, automatically preload newly-visible existing LVs.
Report internal error when parameters are missing on table load.
Teardown any stray devices with $COMMON_PREFIX during test runs.

1
WHATS_NEW_DM
View File

@ -1,5 +1,6 @@
Version 1.02.65 -
==================================
Add dmsetup --checks and dm_task_enable_checks framework to validate ioctls.
Add age_in_minutes parameter to dmsetup udevcomplete_all.
Return immediately from dm_lib_exit() if called more than once.
Disable udev fallback by default and add --verifyudev option to dmsetup.

6
doc/example.conf.in
View File

@ -411,6 +411,12 @@ global {
}
activation {
# Set to 1 to perform internal checks on the operations issued to
# libdevmapper. Useful for debugging problems with activation.
# Some of the checks may be expensive, so it's best to use this
# only when there seems to be a problem.
checks = 0
# Set to 0 to disable udev synchronisation (if compiled into the binaries).
# Processes will not wait for notification from udev.
# They will continue irrespective of any possible udev processing

3
lib/activate/activate.c
View File

@ -394,6 +394,9 @@ int target_version(const char *target_name, uint32_t *maj,
if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
return_0;
if (activation_checks() && !dm_task_enable_checks(dmt))
goto_out;
if (!dm_task_run(dmt)) {
log_debug("Failed to get %s target version", target_name);
/* Assume this was because LIST_VERSIONS isn't supported */

6
lib/activate/dev_manager.c
View File

@ -88,6 +88,9 @@ static struct dm_task *_setup_task(const char *name, const char *uuid,
if (major && !dm_task_set_major_minor(dmt, major, minor, 1))
goto_out;
if (activation_checks() && !dm_task_enable_checks(dmt))
goto_out;
return dmt;
out:
dm_task_destroy(dmt);
@ -148,6 +151,9 @@ int device_is_usable(struct device *dev)
if (!dm_task_set_major_minor(dmt, MAJOR(dev->dev), MINOR(dev->dev), 1))
goto_out;
if (activation_checks() && !dm_task_enable_checks(dmt))
goto_out;
if (!dm_task_run(dmt)) {
log_error("Failed to get state of mapped device");
goto out;

3
lib/commands/toolcontext.c
View File

@ -285,6 +285,9 @@ static int _process_config(struct cmd_context *cmd)
"activation/udev_sync",
DEFAULT_UDEV_SYNC);
init_activation_checks(find_config_tree_int(cmd, "activation/checks",
DEFAULT_ACTIVATION_CHECKS));
#ifdef UDEV_SYNC_SUPPORT
/*
* We need udev rules to be applied, otherwise we would end up with no

1
lib/config/defaults.h
View File

@ -79,6 +79,7 @@
#define DEFAULT_UDEV_RULES 1
#define DEFAULT_UDEV_SYNC 0
#define DEFAULT_VERIFY_UDEV_OPERATIONS 0
#define DEFAULT_ACTIVATION_CHECKS 0
#define DEFAULT_EXTENT_SIZE 4096 /* In KB */
#define DEFAULT_MAX_PV 0
#define DEFAULT_MAX_LV 0

14
lib/misc/lvm-globals.c
View File

@ -42,6 +42,7 @@ static int _ignore_suspended_devices = 0;
static int _error_message_produced = 0;
static unsigned _is_static = 0;
static int _udev_checking = 1;
static int _activation_checks = 0;
static char _sysfs_dir_path[PATH_MAX] = "";
static int _dev_disable_after_error_count = DEFAULT_DISABLE_AFTER_ERROR_COUNT;
static uint64_t _pv_min_size = (DEFAULT_PV_MIN_SIZE_KB * 1024L >> SECTOR_SHIFT);
@ -131,6 +132,14 @@ void init_udev_checking(int checking)
log_debug("LVM udev checking disabled");
}
void init_activation_checks(int checks)
{
if ((_activation_checks = checks))
log_debug("LVM activation checks enabled");
else
log_debug("LVM activation checks disabled");
}
void init_dev_disable_after_error_count(int value)
{
_dev_disable_after_error_count = value;
@ -256,6 +265,11 @@ int udev_checking(void)
return _udev_checking;
}
int activation_checks(void)
{
return _activation_checks;
}
const char *sysfs_dir_path(void)
{
return _sysfs_dir_path;

2
lib/misc/lvm-globals.h
View File

@ -40,6 +40,7 @@ void init_is_static(unsigned value);
void init_udev_checking(int checking);
void init_dev_disable_after_error_count(int value);
void init_pv_min_size(uint64_t sectors);
void init_activation_checks(int checks);
void set_cmd_name(const char *cmd_name);
void set_sysfs_dir_path(const char *path);
@ -63,6 +64,7 @@ unsigned is_static(void);
int udev_checking(void);
const char *sysfs_dir_path(void);
uint64_t pv_min_size(void);
int activation_checks(void);
#define DMEVENTD_MONITOR_IGNORE -1
int dmeventd_monitor_mode(void);

16
libdm/ioctl/libdm-iface.c
View File

@ -1884,6 +1884,16 @@ no_match:
return r;
}
static int _suspend_with_validation_v4(struct dm_task *dmt)
{
/*
* FIXME Ensure we can't leave any I/O trapped between suspended devices.
*/
dmt->enable_checks = 0;
return dm_task_run(dmt);
}
static const char *_sanitise_message(char *message)
{
const char *sanitised_message = message ?: "";
@ -1963,7 +1973,7 @@ static struct dm_ioctl *_do_dm_ioctl(struct dm_task *dmt, unsigned command,
}
log_debug("dm %s %s%s %s%s%s %s%.0d%s%.0d%s"
"%s%c%c%s%s%s%s %.0" PRIu64 " %s [%u]",
"%s%c%c%s%s%s%s%s %.0" PRIu64 " %s [%u]",
_cmd_data_v4[dmt->type].name,
dmt->new_uuid ? "UUID " : "",
dmi->name, dmi->uuid, dmt->newname ? " " : "",
@ -1980,6 +1990,7 @@ static struct dm_ioctl *_do_dm_ioctl(struct dm_task *dmt, unsigned command,
dmt->skip_lockfs ? "S " : "",
dmt->secure_data ? "W " : "",
dmt->query_inactive_table ? "I " : "",
dmt->enable_checks ? "C" : "",
dmt->sector, _sanitise_message(dmt->message),
dmi->data_size);
#ifdef DM_IOCTLS
@ -2054,6 +2065,9 @@ int dm_task_run(struct dm_task *dmt)
if ((dmt->type == DM_DEVICE_RELOAD) && dmt->suppress_identical_reload)
return _reload_with_suppression_v4(dmt);
if ((dmt->type == DM_DEVICE_SUSPEND) && dmt->enable_checks)
return _suspend_with_validation_v4(dmt);
if (!_open_control()) {
_udev_complete(dmt);
return 0;

1
libdm/ioctl/libdm-targets.h
View File

@ -65,6 +65,7 @@ struct dm_task {
int cookie_set;
int new_uuid;
int secure_data;
int enable_checks;
char *uuid;
};

6
libdm/libdevmapper.h
View File

@ -190,6 +190,12 @@ int dm_task_skip_lockfs(struct dm_task *dmt);
int dm_task_query_inactive_table(struct dm_task *dmt);
int dm_task_suppress_identical_reload(struct dm_task *dmt);
int dm_task_secure_data(struct dm_task *dmt);
/*
* Enable checks for common mistakes such as issuing ioctls in an unsafe order.
*/
int dm_task_enable_checks(struct dm_task *dmt);
typedef enum {
DM_ADD_NODE_ON_RESUME, /* add /dev/mapper node with dmsetup resume */
DM_ADD_NODE_ON_CREATE /* add /dev/mapper node with dmsetup create */

7
libdm/libdm-common.c
View File

@ -395,6 +395,13 @@ int dm_task_set_mode(struct dm_task *dmt, mode_t mode)
return 1;
}
int dm_task_enable_checks(struct dm_task *dmt)
{
dmt->enable_checks = 1;
return 1;
}
int dm_task_add_target(struct dm_task *dmt, uint64_t start, uint64_t size,
const char *ttype, const char *params)
{

4
man/dmsetup.8.in
View File

@ -114,6 +114,10 @@ Invoking the command as \fBdevmap_name\fP is equivalent to
.br
\fBdmsetup info -c --noheadings -j \fImajor\fB -m \fIminor\fP.
.SH OPTIONS
.IP \fB--checks
Perform additional checks on the operations requested and report
potential problems. Useful when debugging scripts.
In some cases these checks may slow down operations noticeably.
.IP \fB-c|-C|--columns
.br
Display output in columns rather than as Field: Value lines.

1
test/lib/aux.sh
View File

@ -381,6 +381,7 @@ global/locking_dir = "$TESTDIR/var/lock/lvm"
global/locking_type=$LVM_TEST_LOCKING
global/si_unit_consistency = 1
global/fallback_to_local_locking = 0
activation/checks = 1
activation/udev_sync = 1
activation/udev_rules = 1
activation/verify_udev_operations = $VERIFY_UDEV

51
tools/dmsetup.c
View File

@ -117,6 +117,9 @@ extern char *optarg;
*/
enum {
READ_ONLY = 0,
ADD_NODE_ON_CREATE_ARG,
ADD_NODE_ON_RESUME_ARG,
CHECKS_ARG,
COLS_ARG,
EXEC_ARG,
FORCE_ARG,
@ -153,8 +156,6 @@ enum {
VERIFYUDEV_ARG,
VERSION_ARG,
YES_ARG,
ADD_NODE_ON_RESUME_ARG,
ADD_NODE_ON_CREATE_ARG,
NUM_SWITCHES
};
@ -317,6 +318,9 @@ static struct dm_task *_get_deps_task(int major, int minor)
if (_switches[INACTIVE_ARG] && !dm_task_query_inactive_table(dmt))
goto err;
if (_switches[CHECKS_ARG] && !dm_task_enable_checks(dmt))
goto err;
if (!dm_task_run(dmt))
goto err;
@ -572,6 +576,9 @@ static int _load(CMD_ARGS)
if (_switches[INACTIVE_ARG] && !dm_task_query_inactive_table(dmt))
goto out;
if (_switches[CHECKS_ARG] && !dm_task_enable_checks(dmt))
goto out;
if (!dm_task_run(dmt))
goto out;
@ -645,6 +652,8 @@ static int _create(CMD_ARGS)
udev_flags |= DM_UDEV_DISABLE_DM_RULES_FLAG |
DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG;
if (_switches[CHECKS_ARG] && !dm_task_enable_checks(dmt))
goto out;
if (!_set_task_add_node(dmt))
goto out;
@ -699,6 +708,9 @@ static int _rename(CMD_ARGS)
if (_switches[INACTIVE_ARG] && !dm_task_query_inactive_table(dmt))
goto out;
if (_switches[CHECKS_ARG] && !dm_task_enable_checks(dmt))
goto out;
if (_switches[NOUDEVRULES_ARG])
udev_flags |= DM_UDEV_DISABLE_DM_RULES_FLAG |
DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG;
@ -778,6 +790,9 @@ static int _message(CMD_ARGS)
if (_switches[INACTIVE_ARG] && !dm_task_query_inactive_table(dmt))
goto out;
if (_switches[CHECKS_ARG] && !dm_task_enable_checks(dmt))
goto out;
if (!dm_task_run(dmt))
goto out;
@ -816,6 +831,9 @@ static int _setgeometry(CMD_ARGS)
if (_switches[INACTIVE_ARG] && !dm_task_query_inactive_table(dmt))
goto out;
if (_switches[CHECKS_ARG] && !dm_task_enable_checks(dmt))
goto out;
/* run the task */
if (!dm_task_run(dmt))
goto out;
@ -1234,6 +1252,9 @@ static int _simple(int task, const char *name, uint32_t event_nr, int display)
if (_switches[NOLOCKFS_ARG] && !dm_task_skip_lockfs(dmt))
goto out;
if (_switches[CHECKS_ARG] && !dm_task_enable_checks(dmt))
goto out;
/* FIXME: needs to coperate with udev */
if (!_set_task_add_node(dmt))
goto out;
@ -1314,6 +1335,9 @@ static int _process_all(const struct command *cmd, int argc, char **argv, int si
if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
return 0;
if (_switches[CHECKS_ARG] && !dm_task_enable_checks(dmt))
goto out;
if (!dm_task_run(dmt)) {
r = 0;
goto out;
@ -1362,6 +1386,9 @@ static uint64_t _get_device_size(const char *name)
if (_switches[INACTIVE_ARG] && !dm_task_query_inactive_table(dmt))
goto out;
if (_switches[CHECKS_ARG] && !dm_task_enable_checks(dmt))
goto out;
if (!dm_task_run(dmt))
goto out;
@ -1411,6 +1438,9 @@ static int _error_device(CMD_ARGS)
if (_switches[INACTIVE_ARG] && !dm_task_query_inactive_table(dmt))
goto error;
if (_switches[CHECKS_ARG] && !dm_task_enable_checks(dmt))
goto error;
if (!dm_task_run(dmt))
goto error;
@ -1586,6 +1616,9 @@ static int _status(CMD_ARGS)
if (_switches[INACTIVE_ARG] && !dm_task_query_inactive_table(dmt))
goto out;
if (_switches[CHECKS_ARG] && !dm_task_enable_checks(dmt))
goto out;
if (!dm_task_run(dmt))
goto out;
@ -1659,6 +1692,9 @@ static int _targets(CMD_ARGS)
if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
return 0;
if (_switches[CHECKS_ARG] && !dm_task_enable_checks(dmt))
goto out;
if (!dm_task_run(dmt))
goto out;
@ -1709,6 +1745,9 @@ static int _info(CMD_ARGS)
if (_switches[INACTIVE_ARG] && !dm_task_query_inactive_table(dmt))
goto out;
if (_switches[CHECKS_ARG] && !dm_task_enable_checks(dmt))
goto out;
if (!dm_task_run(dmt))
goto out;
@ -1749,6 +1788,9 @@ static int _deps(CMD_ARGS)
if (_switches[INACTIVE_ARG] && !dm_task_query_inactive_table(dmt))
goto out;
if (_switches[CHECKS_ARG] && !dm_task_enable_checks(dmt))
goto out;
if (!dm_task_run(dmt))
goto out;
@ -2764,7 +2806,7 @@ static void _usage(FILE *out)
fprintf(out, "Usage:\n\n");
fprintf(out, "dmsetup [--version] [-h|--help [-c|-C|--columns]]\n"
" [-v|--verbose [-v|--verbose ...]]\n"
" [--checks] [-v|--verbose [-v|--verbose ...]]\n"
" [-r|--readonly] [--noopencount] [--nolockfs] [--inactive]\n"
" [--udevcookie [cookie]] [--noudevrules] [--noudevsync] [--verifyudev]\n"
" [-y|--yes] [--readahead [+]<sectors>|auto|none]\n"
@ -3119,6 +3161,7 @@ static int _process_switches(int *argc, char ***argv, const char *dev_dir)
#ifdef HAVE_GETOPTLONG
static struct option long_options[] = {
{"readonly", 0, &ind, READ_ONLY},
{"checks", 0, &ind, CHECKS_ARG},
{"columns", 0, &ind, COLS_ARG},
{"exec", 1, &ind, EXEC_ARG},
{"force", 0, &ind, FORCE_ARG},
@ -3258,6 +3301,8 @@ static int _process_switches(int *argc, char ***argv, const char *dev_dir)
_switches[ADD_NODE_ON_RESUME_ARG]++;
if (ind == ADD_NODE_ON_CREATE_ARG)
_switches[ADD_NODE_ON_CREATE_ARG]++;
if (ind == CHECKS_ARG)
_switches[CHECKS_ARG]++;
if (ind == UDEVCOOKIE_ARG) {
_switches[UDEVCOOKIE_ARG]++;
_udev_cookie = _get_cookie_value(optarg);