mdadm-1.6.0
[thirdparty/mdadm.git] / mdadm.c
diff --git a/mdadm.c b/mdadm.c
index d17e0b1..827f334 100644 (file)
--- a/mdadm.c
+++ b/mdadm.c
 
 #include "mdadm.h"
 #include "md_p.h"
+#include <ctype.h>
 
-int open_mddev(char *dev)
+
+void make_parts(char *dev, int cnt)
 {
-       int mdfd = open(dev, O_RDWR, 0);
+       /* make 'cnt' partition devices for 'dev'
+        * We use the major/minor from dev and add 1..cnt
+        * If dev ends with a digit, we add "_p%d" else "%d"
+        * If the name exists, we use it's owner/mode,
+        * else that of dev
+        */
+       struct stat stb;
+       int major, minor;
+       int i;
+       char *name = malloc(strlen(dev) + 20);
+       int dig = isdigit(dev[strlen(dev)-1]);
+
+       if (stat(dev, &stb)!= 0)
+               return;
+       if (!S_ISBLK(stb.st_mode))
+               return;
+       major = MAJOR(stb.st_rdev);
+       minor = MINOR(stb.st_rdev);
+       for (i=1; i <= cnt ; i++) {
+               struct stat stb2;
+               sprintf(name, "%s%s%d", dev, dig?"_p":"", i);
+               if (stat(name, &stb2)==0) {
+                       if (!S_ISBLK(stb2.st_mode))
+                               continue;
+                       if (stb2.st_rdev == MKDEV(major, minor+i))
+                               continue;
+                       unlink(name);
+               } else {
+                       stb2 = stb;
+               }
+               mknod(name, S_IFBLK | 0600, MKDEV(major, minor+i));
+               chown(name, stb2.st_uid, stb2.st_gid);
+               chmod(name, stb2.st_mode & 07777);
+       }
+}
+
+/*
+ * Open a given md device, and check that it really is one.
+ * If 'autof' is given, then we need to create, or recreate, the md device.
+ * If the name already exists, and is not a block device, we fail.
+ * If it exists and is not an md device, is not the right type (partitioned or not),
+ * or is currently in-use, we remove the device, but remember the owner and mode.
+ * If it now doesn't exist, we find a few md array and create the device.
+ * Default ownership is user=0, group=0 perm=0600
+ */
+int open_mddev(char *dev, int autof)
+{
+       int mdfd;
+       struct stat stb;
+       int major = MD_MAJOR;
+       int minor;
+       int must_remove = 0;
+       struct mdstat_ent *mdlist;
+       int num;
+
+       if (autof) {
+               /* autof is set, so we need to check that the name is ok,
+                * and possibly create one if not
+                */
+               stb.st_mode = 0;
+               if (lstat(dev, &stb)==0 && ! S_ISBLK(stb.st_mode)) {
+                       fprintf(stderr, Name ": %s is not a block device.\n",
+                               dev);
+                       return -1;
+               }
+               /* check major number is correct */
+               if (autof>0)
+                       major = get_mdp_major();
+               if (stb.st_mode && MAJOR(stb.st_rdev) != major)
+                       must_remove = 1;
+               if (stb.st_mode && !must_remove) {
+                       mdu_array_info_t array;
+                       /* looks ok, see if it is available */
+                       mdfd = open(dev, O_RDWR, 0);
+                       if (mdfd < 0) {
+                               fprintf(stderr, Name ": error opening %s: %s\n",
+                                       dev, strerror(errno));
+                               return -1;
+                       } else if (md_get_version(mdfd) <= 0) {
+                               fprintf(stderr, Name ": %s does not appear to be an md device\n",
+                                       dev);
+                               close(mdfd);
+                               return -1;
+                       }
+                       if (ioctl(mdfd, GET_ARRAY_INFO, &array)==0) {
+                               /* already active */
+                               must_remove = 1;
+                               close(mdfd);
+                       } else {
+                               if (autof > 0)
+                                       make_parts(dev, autof);
+                               return mdfd;
+                       }
+               }
+               /* Ok, need to find a minor that is not in use.
+                * Easiest to read /proc/mdstat, and hunt through for
+                * an unused number 
+                */
+               mdlist = mdstat_read(0);
+               for (num= (autof>0)?-1:0 ; ; num+= (autof>2)?-1:1) {
+                       struct mdstat_ent *me;
+                       for (me=mdlist; me; me=me->next)
+                               if (me->devnum == num)
+                                       break;
+                       if (!me) {
+                               /* doesn't exist if mdstat.
+                                * make sure it is new to /dev too
+                                */
+                               char *dn;
+                               if (autof > 0) 
+                                       minor = (-1-num) << MdpMinorShift;
+                               else
+                                       minor = num;
+                               dn = map_dev(major,minor);
+                               if (dn==NULL || is_standard(dn)) {
+                                       /* this number only used by a 'standard' name,
+                                        * so it is safe to use
+                                        */
+                                       break;
+                               }
+                       }
+               }
+               /* 'num' is the number to use, >=0 for md, <0 for mdp */
+               if (must_remove) {
+                       /* never remove a device name that ends /mdNN or /dNN,
+                        * that would be confusing 
+                        */
+                       if (is_standard(dev)) {
+                               fprintf(stderr, Name ": --auto refusing to remove %s as it looks like a standard name.\n",
+                                       dev);
+                               return -1;
+                       }
+                       unlink(dev);
+               }
+
+               if (mknod(dev, S_IFBLK|0600, MKDEV(major, minor))!= 0) {
+                       fprintf(stderr, Name ": failed to create %s\n", dev);
+                       return -1;
+               }
+               if (must_remove) {
+                       chown(dev, stb.st_uid, stb.st_gid);
+                       chmod(dev, stb.st_mode & 07777);
+               }
+               make_parts(dev,autof);
+       }
+       mdfd = open(dev, O_RDWR, 0);
        if (mdfd < 0)
                fprintf(stderr, Name ": error opening %s: %s\n",
                        dev, strerror(errno));
@@ -57,7 +204,7 @@ int main(int argc, char *argv[])
        int rv;
 
        int chunk = 0;
-       int size = 0;
+       int size = -1;
        int level = UnSet;
        int layout = UnSet;
        int raiddisks = 0;
@@ -79,6 +226,8 @@ int main(int argc, char *argv[])
        int brief = 0;
        int force = 0;
        int test = 0;
+       int assume_clean = 0;
+       int autof = 0; /* -1 for non-partitions, 1 or more to create partitions */
 
        char *mailaddr = NULL;
        char *program = NULL;
@@ -114,6 +263,7 @@ int main(int argc, char *argv[])
                                case MANAGE   : help_text = Help_manage; break;
                                case MISC     : help_text = Help_misc; break;
                                case MONITOR  : help_text = Help_monitor; break;
+                               case GROW     : help_text = Help_grow; break;
                                }
                        fputs(help_text,stderr);
                        exit(0);
@@ -150,6 +300,7 @@ int main(int argc, char *argv[])
                case 'B': newmode = BUILD; break;
                case 'C': newmode = CREATE; break;
                case 'F': newmode = MONITOR;break;
+               case 'G': newmode = GROW; break;
 
                case '#':
                case 'D':
@@ -200,13 +351,14 @@ int main(int argc, char *argv[])
                case 'B':
                case 'C':
                case 'F':
+               case 'G':
                        continue;
                }
                if (opt == 1) {
                        /* an undecorated option - must be a device name.
                         */
                        if (devs_found > 0 && mode == '@' && !devmode) {
-                               fprintf(stderr, Name ": Must give on of -a/-r/-f for subsequent devices at %s\n", optarg);
+                               fprintf(stderr, Name ": Must give one of -a/-r/-f for subsequent devices at %s\n", optarg);
                                exit(2);
                        }
                        dv = malloc(sizeof(*dv));
@@ -243,17 +395,22 @@ int main(int argc, char *argv[])
                        }
                        continue;
 
+               case O(GROW,'z'):
                case O(CREATE,'z'): /* size */
-                       if (size) {
+                       if (size >= 0) {
                                fprintf(stderr, Name ": size may only be specified once. "
                                        "Second value is %s.\n", optarg);
                                exit(2);
                        }
-                       size = strtol(optarg, &c, 10);
-                       if (!optarg[0] || *c || size < 4) {
-                               fprintf(stderr, Name ": invalid size: %s\n",
-                                       optarg);
-                               exit(2);
+                       if (strcmp(optarg, "max")==0)
+                               size = 0;
+                       else {
+                               size = strtol(optarg, &c, 10);
+                               if (!optarg[0] || *c || size < 4) {
+                                       fprintf(stderr, Name ": invalid size: %s\n",
+                                               optarg);
+                                       exit(2);
+                               }
                        }
                        continue;
 
@@ -270,7 +427,7 @@ int main(int argc, char *argv[])
                                        optarg);
                                exit(2);
                        }
-                       if (level != 0 && level != -1 && mode == BUILD) {
+                       if (level != 0 && level != -1 && level != 1 && level != -4 && mode == BUILD) {
                                fprintf(stderr, Name ": Raid level %s not permitted with --build.\n",
                                        optarg);
                                exit(2);
@@ -310,6 +467,12 @@ int main(int argc, char *argv[])
                        }
                        continue;
 
+               case O(CREATE,3):
+               case O(BUILD,3): /* assume clean */
+                       assume_clean = 1;
+                       continue;
+
+               case O(GROW,'n'):
                case O(CREATE,'n'):
                case O(BUILD,'n'): /* number of raid disks */
                        if (raiddisks) {
@@ -350,6 +513,43 @@ int main(int argc, char *argv[])
                                exit(2);
                        }
                        continue;
+
+               case O(CREATE,'a'):
+               case O(BUILD,'a'):
+               case O(ASSEMBLE,'a'): /* auto-creation of device node */
+                       if (optarg == NULL)
+                               autof = -1;
+                       else if (strcasecmp(optarg,"no")==0)
+                               autof = 0;
+                       else if (strcasecmp(optarg,"yes")==0 || strcasecmp(optarg,"md")==0)
+                               autof = -1;
+                       else {
+                               /* There might be digits, and maybe a hypen, at the end */
+                               char *e = optarg + strlen(optarg);
+                               int num = 4;
+                               int len;
+                               while (e > optarg && isdigit(e[-1]))
+                                       e--;
+                               if (*e) {
+                                       num = atoi(e);
+                                       if (num <= 0) num = 1;
+                               }
+                               if (e > optarg && e[-1] == '-')
+                                       e--;
+                               len = e - optarg;
+                               if ((len == 3 && strncasecmp(optarg,"mdp",3)==0) ||
+                                   (len == 1 && strncasecmp(optarg,"p",1)==0) ||
+                                   (len >= 4 && strncasecmp(optarg,"part",4)==0))
+                                       autof = num;
+                               else {
+                                       fprintf(stderr, Name ": --auto flag arg of \"%s\" unrecognised: use no,yes,md,mdp,part\n"
+                                               "        optionally followed by a number.\n",
+                                               optarg);
+                                       exit(2);
+                               }
+                       }
+                       continue;
+
                case O(BUILD,'f'): /* force honouring '-n 1' */
                case O(CREATE,'f'): /* force honouring of device list */
                case O(ASSEMBLE,'f'): /* force assembly */
@@ -463,10 +663,7 @@ int main(int argc, char *argv[])
                        /* now the general management options.  Some are applicable
                         * to other modes. None have arguments.
                         */
-               case O(MANAGE,'a'):
-               case O(CREATE,'a'):
-               case O(BUILD,'a'):
-               case O(ASSEMBLE,'a'): /* add a drive */
+               case O(MANAGE,'a'): /* add a drive */
                        devmode = 'a';
                        continue;
                case O(MANAGE,'r'): /* remove a drive */
@@ -559,12 +756,17 @@ int main(int argc, char *argv[])
         * we check that here and open it.
         */
 
-       if (mode==MANAGE || mode == BUILD || mode == CREATE || (mode == ASSEMBLE && ! scan)) {
+       if (mode==MANAGE || mode == BUILD || mode == CREATE || mode == GROW ||
+           (mode == ASSEMBLE && ! scan)) {
                if (devs_found < 1) {
                        fprintf(stderr, Name ": an md device must be given in this mode\n");
                        exit(2);
                }
-               mdfd = open_mddev(devlist->devname);
+               if ((int)ident.super_minor == -2 && autof) {
+                       fprintf(stderr, Name ": --super-minor=dev is incompatible with --auto\n");      
+                       exit(2);
+               }
+               mdfd = open_mddev(devlist->devname, autof);
                if (mdfd < 0)
                        exit(1);
                if ((int)ident.super_minor == -2) {
@@ -593,7 +795,7 @@ int main(int argc, char *argv[])
                    ident.super_minor == UnSet && !scan ) {
                        /* Only a device has been given, so get details from config file */
                        mddev_ident_t array_ident = conf_get_ident(configfile, devlist->devname);
-                       mdfd = open_mddev(devlist->devname);
+                       mdfd = open_mddev(devlist->devname, array_ident->autof);
                        if (mdfd < 0)
                                rv |= 1;
                        else {
@@ -618,7 +820,7 @@ int main(int argc, char *argv[])
                        }
                        for (dv = devlist ; dv ; dv=dv->next) {
                                mddev_ident_t array_ident = conf_get_ident(configfile, dv->devname);
-                               mdfd = open_mddev(dv->devname);
+                               mdfd = open_mddev(dv->devname, array_ident->autof);
                                if (mdfd < 0) {
                                        rv |= 1;
                                        continue;
@@ -641,7 +843,7 @@ int main(int argc, char *argv[])
                        } else
                                for (; array_list; array_list = array_list->next) {
                                        mdu_array_info_t array;
-                                       mdfd = open_mddev(array_list->devname);
+                                       mdfd = open_mddev(array_list->devname, array_list->autof);
                                        if (mdfd < 0) {
                                                rv |= 1;
                                                continue;
@@ -657,10 +859,10 @@ int main(int argc, char *argv[])
                }
                break;
        case BUILD:
-               rv = Build(devlist->devname, mdfd, chunk, level, raiddisks, devlist->next);
+               rv = Build(devlist->devname, mdfd, chunk, level, raiddisks, devlist->next, assume_clean);
                break;
        case CREATE:
-               rv = Create(devlist->devname, mdfd, chunk, level, layout, size,
+               rv = Create(devlist->devname, mdfd, chunk, level, layout, size<0 ? 0 : size,
                            raiddisks, sparedisks,
                            devs_found-1, devlist->next, runstop, verbose, force);
                break;
@@ -682,7 +884,7 @@ int main(int argc, char *argv[])
                        if (devlist == NULL) {
                                if ((devmode == 'S' ||devmode=='D') && scan) {
                                        /* apply to all devices in /proc/mdstat */
-                                       struct mdstat_ent *ms = mdstat_read();
+                                       struct mdstat_ent *ms = mdstat_read(0);
                                        struct mdstat_ent *e;
                                        for (e=ms ; e ; e=e->next) {
                                                char *name = get_md_name(e->devnum);
@@ -695,7 +897,7 @@ int main(int argc, char *argv[])
                                                if (devmode == 'D')
                                                        rv |= Detail(name, !verbose, test);
                                                else if (devmode=='S') {
-                                                       mdfd = open_mddev(name);
+                                                       mdfd = open_mddev(name, 0);
                                                        if (mdfd >= 0)
                                                                rv |= Manage_runstop(name, mdfd, -1);
                                                }
@@ -715,7 +917,7 @@ int main(int argc, char *argv[])
                                case 'Q':
                                        rv |= Query(dv->devname); continue;
                                }
-                               mdfd = open_mddev(dv->devname);
+                               mdfd = open_mddev(dv->devname, 0);
                                if (mdfd>=0)
                                        switch(dv->disposition) {
                                        case 'R':
@@ -739,6 +941,20 @@ int main(int argc, char *argv[])
                rv= Monitor(devlist, mailaddr, program,
                            delay?delay:60, daemonise, scan, oneshot, configfile, test);
                break;
+
+       case GROW:
+               if (devs_found > 1) {
+                       fprintf(stderr, Name ": Only one device may be given for --grow\n");
+                       rv = 1;
+                       break;
+               }
+               if (size >= 0 && raiddisks) {
+                       fprintf(stderr, Name ": can only grow size OR raiddisks, not both\n");
+                       rv = 1;
+                       break;
+               }
+               rv = Manage_resize(devlist->devname, mdfd, size, raiddisks);
+               break;
        }
        exit(rv);
 }