HAMMER - Implement volume-list command

[dragonfly.git] / sbin / hammer / cmd_volume.c

diff --git a/sbin/hammer/cmd_volume.c b/sbin/hammer/cmd_volume.c
index 020751a..f184469 100644 (file)
--- a/sbin/hammer/cmd_volume.c
+++ b/sbin/hammer/cmd_volume.c
@@ -38,6 +38,7 @@
  *
  *   - volume-add: Add new volume to HAMMER filesystem
  *   - volume-del: Remove volume from HAMMER filesystem
+ *   - volume-list: List volumes making up a HAMMER filesystem
  */
 
 #include "hammer.h"
@@ -129,6 +130,59 @@ hammer_cmd_volume_del(char **av, int ac)
 }
 
 /*
+ * volume-list <filesystem>
+ */
+void
+hammer_cmd_volume_list(char **av, int ac)
+{
+       struct hammer_ioc_volume_list ioc;
+       int fd;
+
+       if (ac != 1) {
+               fprintf(stderr, "hammer volume-list <filesystem>\n");
+               exit(1);
+       }
+
+       char *filesystem = av[0];
+
+       fd = open(filesystem, O_RDONLY);
+       if (fd < 0) {
+               fprintf(stderr,
+                   "hammer volume-list: unable to access %s: %s\n",
+                   filesystem, strerror(errno));
+               exit(1);
+       }
+
+       /*
+        * volume-list ioctl
+        */
+       bzero(&ioc, sizeof(ioc));
+       ioc.vols = malloc(HAMMER_MAX_VOLUMES *
+                         sizeof(struct hammer_ioc_volume));
+       if (ioc.vols == NULL) {
+               fprintf(stderr,
+                   "hammer volume-list: unable to allocate memory: %s\n",
+                   strerror(errno));
+               exit(1);
+       }
+       ioc.nvols = HAMMER_MAX_VOLUMES;
+
+       if (ioctl(fd, HAMMERIOC_LIST_VOLUMES, &ioc) < 0) {
+               fprintf(stderr, "hammer volume-list ioctl: %s\n",
+                       strerror(errno));
+               free(ioc.vols);
+               exit(1);
+       }
+
+       int i;
+       for (i = 0; i < ioc.nvols; i++)
+               printf("%s\n", ioc.vols[i].device_name);
+
+       free(ioc.vols);
+       close(fd);
+}
+
+/*
  * Check basic volume characteristics.  HAMMER filesystems use a minimum
  * of a 16KB filesystem buffer size.
  *