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Code Releases Activity

Another ioctl interface update:

Browse Source 
Supply offset to start of variable data area (so struct size can change
without breaking backward compatibility)
  Add command that just returns the driver version
This commit is contained in:
Alasdair Kergon 2002-01-15 15:21:57 +00:00
parent 6036e5e0f7
commit 6198a4102c
3 changed files with 57 additions and 9 deletions
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33
libdm/ioctl/libdevmapper.c
View File

@ -13,7 +13,6 @@
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <linux/kdev_t.h>
@ -44,6 +43,17 @@ void dm_task_destroy(struct dm_task *dmt)
free(dmt);
}
int dm_task_get_driver_version(struct dm_task *dmt, char *version,
size_t size)
{
if (!dmt->dmi)
return 0;
strncpy(version, dmt->dmi->version, size);
return 1;
}
int dm_task_get_info(struct dm_task *dmt, struct dm_info *info)
{
if (!dmt->dmi)
@ -51,12 +61,12 @@ int dm_task_get_info(struct dm_task *dmt, struct dm_info *info)
memset(info, 0, sizeof(*info));
info->exists = dmt->dmi->status & DM_EXISTS_FLAG ? 1 : 0;
info->exists = dmt->dmi->flags & DM_EXISTS_FLAG ? 1 : 0;
if (!info->exists)
return 1;
info->suspended = dmt->dmi->status & DM_SUSPEND_FLAG ? 1 : 0;
info->read_only = dmt->dmi->status & DM_READONLY_FLAG ? 1 : 0;
info->suspended = dmt->dmi->flags & DM_SUSPEND_FLAG ? 1 : 0;
info->read_only = dmt->dmi->flags & DM_READONLY_FLAG ? 1 : 0;
info->target_count = dmt->dmi->target_count;
info->open_count = dmt->dmi->open_count;
info->major = MAJOR(dmt->dmi->dev);
@ -188,15 +198,18 @@ static struct dm_ioctl *_flatten(struct dm_task *dmt)
strncpy(dmi->version, DM_IOCTL_VERSION, sizeof(dmi->version));
dmi->data_size = len;
strncpy(dmi->name, dmt->dev_name, sizeof(dmi->name));
dmi->data_start = sizeof(struct dm_ioctl);
if (dmt->dev_name)
strncpy(dmi->name, dmt->dev_name, sizeof(dmi->name));
if (dmt->type == DM_DEVICE_SUSPEND)
dmi->status |= DM_SUSPEND_FLAG;
dmi->flags |= DM_SUSPEND_FLAG;
if (dmt->read_only)
dmi->status |= DM_READONLY_FLAG;
dmi->flags |= DM_READONLY_FLAG;
if (dmt->minor > 0) {
dmi->status |= DM_PERSISTENT_DEV_FLAG;
dmi->flags |= DM_PERSISTENT_DEV_FLAG;
dmi->dev = MKDEV(0, dmt->minor);
}
@ -267,6 +280,10 @@ int dm_task_run(struct dm_task *dmt)
command = DM_RENAME;
break;
case DM_DEVICE_VERSION:
command = DM_VERSION;
break;
default:
log("Internal error: unknown device-mapper task %d",
dmt->type);

4
libdm/libdevmapper.h
View File

@ -8,6 +8,7 @@
#define LIB_DEVICE_MAPPER_H
#include <inttypes.h>
#include <sys/types.h>
/*
* Since it is quite laborious to build the ioctl
@ -39,6 +40,8 @@ enum {
DM_DEVICE_INFO,
DM_DEVICE_RENAME,
DM_DEVICE_VERSION,
};
@ -63,6 +66,7 @@ struct dm_info {
unsigned int target_count;
};
int dm_task_get_driver_version(struct dm_task *dmt, char *version, size_t size);
int dm_task_get_info(struct dm_task *dmt, struct dm_info *dmi);
int dm_task_set_ro(struct dm_task *dmt);

29
tools/dmsetup.c
View File

@ -156,6 +156,32 @@ out:
return r;
}
static int _version(int argc, char **argv)
{
int r = 0;
struct dm_task *dmt;
char version[16];
if (!(dmt = dm_task_create(DM_DEVICE_VERSION)))
return 0;
if (!dm_task_run(dmt))
goto out;
if (!dm_task_get_driver_version(dmt, (char *)&version,
sizeof(version)))
goto out;
printf("Driver version: %s\n", version);
r = 1;
out:
dm_task_destroy(dmt);
return r;
}
static int _simple(int task, const char *name)
{
int r = 0;
@ -256,6 +282,7 @@ static struct command _commands[] = {
{"reload", "<dev_name> <table_file>", 2, _reload},
{"info", "<dev_name>", 1, _info},
{"rename", "<dev_name> <new_name>", 2, _rename},
{"version", "", 0, _version},
{NULL, NULL, 0, NULL}
};
@ -322,7 +349,7 @@ int main(int argc, char **argv)
exit(1);
}
if (argc < 2) {
if (argc == 0) {
_usage(stderr);
exit(1);
}