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-rw-r--r--mdadm.c266
1 files changed, 241 insertions, 25 deletions
diff --git a/mdadm.c b/mdadm.c
index d17e0b1..827f334 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -29,10 +29,157 @@
#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);
}
generated by cgit (git 2.34.1) at 2024-05-01 15:39:27 +0000