[Ocfs2-tools-devel] [PATCH] mounted.ocfs2 tool should show /dev/mapper devices instead of /dev/dm.

[Sunil Mushran]

Signed-off-by: Sunil Mushran <sunil.mushran at oracle.com>

XiaoweiHu wrote:
> The mounted.ocfs2 tool should show /dev/mapper devices instead of /dev/dm.
> Patch uses the device number to match the dm device with its corresponding
> dev-mapper device.
>
> Signed-off-by: XiaoweiHu <xiaowei.hu at oracle.com>
> ---
>  mounted.ocfs2/mounted.c |   61 +++++++++++++++++++++++++++++++++++++++++++++-
>  1 files changed, 59 insertions(+), 2 deletions(-)
>
> diff --git a/mounted.ocfs2/mounted.c b/mounted.ocfs2/mounted.c
> index e4c5877..a78e6be 100644
> --- a/mounted.ocfs2/mounted.c
> +++ b/mounted.ocfs2/mounted.c
> @@ -33,6 +33,7 @@
>  #include <linux/fd.h>
>  #include <string.h>
>  #include <sys/stat.h>
> +#include <dirent.h>
>  
>  #include <uuid/uuid.h>
>  
> @@ -155,12 +156,48 @@ static void ocfs2_print_quick_detect(struct list_head *dev_list)
>  	}
>  }
>  
> +void scan_dir_for_dev(char *dirname, dev_t devno, char **devname)
> +{
> +	DIR *dir;
> +	struct dirent *dp;
> +	char path[PATH_MAX];
> +	int dirlen;
> +	struct stat st;
> +
> +	dir = opendir(dirname);
> +	if (dir == NULL)
> +		return;
> +	dirlen = strlen(dirname) + 2;
> +	while ((dp = readdir(dir)) != 0) {
> +		if (dirlen + strlen(dp->d_name) >= sizeof(path))
> +			continue;
> +
> +		if (dp->d_name[0] == '.' &&
> +		    ((dp->d_name[1] == 0) ||
> +		     ((dp->d_name[1] == '.') && (dp->d_name[2] == 0))))
> +			continue;
> +
> +		sprintf(path, "%s/%s", dirname, dp->d_name);
> +		if (stat(path, &st) < 0)
> +			continue;
> +
> +		if (S_ISBLK(st.st_mode) && st.st_rdev == devno) {
> +			*devname = strdup(path);
> +			break;
> +		}
> +	}
> +	closedir(dir);
> +	return;
> +}
> +
>  static errcode_t ocfs2_partition_list (struct list_head *dev_list)
>  {
>  	errcode_t ret = 0;
>  	FILE *proc;
>  	char line[256];
>  	char name[256];
> +	char *devname = NULL;
> +	int major, minor;
>  	ocfs2_devices *dev;
>  
>  	proc = fopen ("/proc/partitions", "r");
> @@ -170,14 +207,34 @@ static errcode_t ocfs2_partition_list (struct list_head *dev_list)
>  	}
>  
>  	while (fgets (line, sizeof(line), proc) != NULL) {
> -		if (sscanf(line, "%*d %*d %*d %99[^ \t\n]", name) != 1)
> +		if (sscanf(line, "%d %d %*d %99[^ \t\n]",
> +			   &major, &minor, name) != 3)
>  			continue;
>  
>  		ret = ocfs2_malloc0(sizeof(ocfs2_devices), &dev);
>  		if (ret)
>  			goto bail;
>  
> -		snprintf(dev->dev_name, sizeof(dev->dev_name), "/dev/%s", name);
> +		/* Try to translate private device-mapper dm-<N> names
> +		 * to standard /dev/mapper/<name>.
> +		 */
> +		if (!strncmp(name, "dm-", 3) && isdigit(name[3])) {
> +			devname = NULL;
> +			scan_dir_for_dev("/dev/mapper",
> +					 makedev(major, minor), &devname);
> +			if (devname) {
> +				snprintf(dev->dev_name, sizeof(dev->dev_name),
> +					 "%s", devname);
> +				free(devname);
> +			} else
> +				snprintf(dev->dev_name, sizeof(dev->dev_name),
> +					 "/dev/%s", name);
> +
> +		} else {
> +			snprintf(dev->dev_name, sizeof(dev->dev_name),
> +				 "/dev/%s", name);
> +		}
> +
>  		list_add_tail(&(dev->list), dev_list);
>  	}
>  
>