handle Manage_subdevs() for 'external' arrays

[thirdparty/mdadm.git] / util.c

diff --git a/util.c b/util.c
index 733a466d8d9409f8cc573915ec82ff9123d6e206..c6273826d82c3da0082b421f16c640afc5d074cd 100644 (file)
--- a/util.c
+++ b/util.c
@@ -31,6 +31,7 @@
 #include       "md_p.h"
 #include       <sys/utsname.h>
 #include       <ctype.h>
+#include       <dirent.h>
 
 /*
  * following taken from linux/blkpg.h because they aren't
@@ -389,6 +390,9 @@ int is_standard(char *dev, int *nump)
        /* tests if dev is a "standard" md dev name.
         * i.e if the last component is "/dNN" or "/mdNN",
         * where NN is a string of digits
+        * Returns 1 if a partitionable standard,
+        *   -1 if non-partitonable,
+        *   0 if not a standard name.
         */
        char *d = strrchr(dev, '/');
        int type=0;
@@ -608,6 +612,23 @@ char *human_size_brief(long long bytes)
 }
 #endif
 
+unsigned long long calc_array_size(int level, int raid_disks, int layout,
+                                  int chunksize, unsigned long long devsize)
+{
+       int data_disks = 0;
+       switch (level) {
+       case 0: data_disks = raid_disks; break;
+       case 1: data_disks = 1; break;
+       case 4:
+       case 5: data_disks = raid_disks - 1; break;
+       case 6: data_disks = raid_disks - 2; break;
+       case 10: data_disks = raid_disks / (layout & 255) / ((layout>>8)&255);
+               break;
+       }
+       devsize &= ~(unsigned long long)((chunksize>>9)-1);
+       return data_disks * devsize;
+}
+
 #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
 int get_mdp_major(void)
 {
@@ -759,9 +780,12 @@ int dev_open(char *dev, int flags)
        return fd;
 }
 
-struct superswitch *superlist[] = { &super0, &super1, NULL };
+struct superswitch *superlist[] = { &super0, &super1, &super_ddf, &super_imsm, NULL };
 
 #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
+
+struct supertype supertype_container_member;
+
 struct supertype *super_by_fd(int fd)
 {
        mdu_array_info_t array;
@@ -791,8 +815,11 @@ struct supertype *super_by_fd(int fd)
                sprintf(version, "%d.%d", vers, minor);
                verstr = version;
        }
-       for (i = 0; st == NULL && superlist[i] ; i++)
-               st = superlist[i]->match_metadata_desc(verstr);
+       if (minor == -2 && verstr[0] == '/')
+               st = &supertype_container_member;
+       else
+               for (i = 0; st == NULL && superlist[i] ; i++)
+                       st = superlist[i]->match_metadata_desc(verstr);
 
        if (sra)
                sysfs_free(sra);
@@ -908,6 +935,78 @@ void get_one_disk(int mdfd, mdu_array_info_t *ainf, mdu_disk_info_t *disk)
                        return;
 }
 
+int open_container(int fd)
+{
+       /* 'fd' is a block device.  Find out if it is in use
+        * by a container, and return an open fd on that container.
+        */
+       char path[256];
+       char *e;
+       DIR *dir;
+       struct dirent *de;
+       int dfd, n;
+       char buf[200];
+       int major, minor;
+       struct stat st;
+
+       if (fstat(fd, &st) != 0)
+               return -1;
+       sprintf(path, "/sys/dev/block/%d:%d/holders",
+               (int)major(st.st_rdev), (int)minor(st.st_rdev));
+       e = path + strlen(path);
+
+       dir = opendir(path);
+       if (!dir)
+               return -1;
+       while ((de = readdir(dir))) {
+               if (de->d_ino == 0)
+                       continue;
+               if (de->d_name[0] == '.')
+                       continue;
+               sprintf(e, "/%s/dev", de->d_name);
+               dfd = open(path, O_RDONLY);
+               if (dfd < 0)
+                       continue;
+               n = read(dfd, buf, sizeof(buf));
+               close(dfd);
+               if (n <= 0 || n >= sizeof(buf))
+                       continue;
+               buf[n] = 0;
+               if (sscanf(buf, "%d:%d", &major, &minor) != 2)
+                       continue;
+               sprintf(buf, "%d:%d", major, minor);
+               dfd = dev_open(buf, O_RDONLY);
+               if (dfd >= 0) {
+                       closedir(dir);
+                       return dfd;
+               }
+       }
+       return -1;
+}
+
+char *devnum2devname(int num)
+{
+       char name[100];
+       if (num > 0)
+               sprintf(name, "md%d", num);
+       else
+               sprintf(name, "md_d%d", -1-num);
+       return strdup(name);
+}
+
+int fd2devnum(int fd)
+{
+       struct stat stb;
+       if (fstat(fd, &stb) == 0 &&
+           (S_IFMT&stb.st_mode)==S_IFBLK) {
+               if (major(stb.st_rdev) == MD_MAJOR)
+                       return minor(stb.st_rdev);
+               else
+                       return -1- (minor(stb.st_rdev)>>6);
+       }
+       return -1;
+}
+
 #ifdef __TINYC__
 /* tinyc doesn't optimize this check in ioctl.h out ... */
 unsigned int __invalid_size_argument_for_IOC = 0;