mdctl-v0.4

[thirdparty/mdadm.git] / Build.c

diff --git a/Build.c b/Build.c
index bcad0a62864d74516f93cb9c7e13e98f784ed9c1..40b631f168f4787827020072f6256610263d31aa 100644 (file)
--- a/Build.c
+++ b/Build.c
@@ -29,8 +29,141 @@
 
 #include "mdctl.h"
 
+#define REGISTER_DEV           _IO (MD_MAJOR, 1)
+#define START_MD               _IO (MD_MAJOR, 2)
+#define STOP_MD                _IO (MD_MAJOR, 3)
+
 int Build(char *mddev, int mdfd, int chunk, int level,
          int raiddisks,
          int subdevs, char *subdev[])
 {
+       /* Build a linear or raid0 arrays without superblocks
+        * We cannot really do any checks, we just do it.
+        * For md_version < 0.90.0, we call REGISTER_DEV
+        * with the device numbers, and then
+        * START_MD giving the "geometry"
+        * geometry is 0xpp00cc
+        * where pp is personality: 1==linear, 2=raid0
+        * cc = chunk size factor: 0==4k, 1==8k etc.
+        *
+        * For md_version >= 0.90.0 we call
+        * SET_ARRAY_INFO,  ADD_NEW_DISK, RUN_ARRAY
+        *
+        */
+       int i;
+       int vers;
+       struct stat stb;
+       if (raiddisks != subdevs) {
+               fprintf(stderr, Name ": requested %d devices in array but listed %d\n",
+                       raiddisks, subdevs);
+               return 1;
+       }
+
+       /* scan all devices, make sure they really are block devices */
+       for (i=0; i<subdevs; i++) {
+               if (stat(subdev[i], &stb)) {
+                       fprintf(stderr, Name ": Cannot find %s: %s\n",
+                               subdev[i], strerror(errno));
+                       return 1;
+               }
+               if ((stb.st_mode & S_IFMT) != S_IFBLK) {
+                       fprintf(stderr, Name ": %s is not a block device.\n",
+                               subdev[i]);
+                       return 1;
+               }
+       }
+
+       vers = md_get_version(mdfd);
+       
+       /* looks Ok, go for it */
+       if (vers >= 90000) {
+               mdu_array_info_t array;
+               array.level = level;
+               array.size = 0;
+               array.nr_disks = raiddisks;
+               array.raid_disks = raiddisks;
+               array.md_minor = 0;
+               if (fstat(mdfd, &stb)==0)
+                       array.md_minor = MINOR(stb.st_rdev);
+               array.not_persistent = 0;
+               array.state = 0; /* not clean, but no errors */
+               array.active_disks = raiddisks;
+               array.working_disks = raiddisks;
+               array.spare_disks = 0;
+               array.failed_disks = 0;
+               array.chunk_size = chunk*1024;
+               if (ioctl(mdfd, SET_ARRAY_INFO, &array)) {
+                       fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n",
+                               mddev, strerror(errno));
+                       return 1;
+               }
+       }
+       /* now add the devices */
+       for (i=0; i<subdevs; i++) {
+               if (stat(subdev[i], &stb)) {
+                       fprintf(stderr, Name ": Wierd: %s has disappeared.\n",
+                               subdev[i]);
+                       goto abort;
+               }
+               if ((stb.st_rdev & S_IFMT)!= S_IFBLK) {
+                       fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n",
+                               subdev[i]);
+                       goto abort;
+               }
+               if (vers> 90000) {
+                       mdu_disk_info_t disk;
+                       disk.number = i;
+                       disk.raid_disk = i;
+                       disk.state = 6;
+                       disk.major = MAJOR(stb.st_rdev);
+                       disk.minor = MINOR(stb.st_rdev);
+                       if (ioctl(mdfd, ADD_NEW_DISK, &disk)) {
+                               fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n",
+                                       subdev[i], strerror(errno));
+                               goto abort;
+                       }
+               } else {
+                       if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) {
+                               fprintf(stderr, Name ": REGISTER_DEV failed for %s.\n",
+                                       subdev[i], strerror(errno));
+                               goto abort;
+                       }
+               }
+       }
+       /* now to start it */
+       if (vers > 90000) {
+               mdu_param_t param; /* not used by syscall */
+               if (ioctl(mdfd, RUN_ARRAY, param)) {
+                       fprintf(stderr, Name ": RUN_ARRAY failed: %s\n",
+                               strerror(errno));
+                       goto abort;
+               }
+       } else {
+               int arg;
+               arg=0;
+               while (chunk > 4096) {
+                       arg++;
+                       chunk >>= 1;
+               }
+               if (level == 0)
+                       chunk |= 0x20000;
+               else    chunk |= 0x10000;
+               if (ioctl(mdfd, START_MD, arg)) {
+                       fprintf(stderr, Name ": START_MD failed: %s\n",
+                               strerror(errno));
+                       goto abort;
+               }
+       }
+       fprintf(stderr, Name ": array %s built and started.\n",
+               mddev);
+       return 0;
+
+ abort:
+       if (vers > 900000)
+           ioctl(mdfd, STOP_ARRAY, 0);
+       else
+           ioctl(mdfd, STOP_MD, 0);
+       return 1;
+               
 }
+