/*
* mdadm - manage Linux "md" devices aka RAID arrays.
*
- * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
+ * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
*
*
* This program is free software; you can redistribute it and/or modify
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Neil Brown
- * Email: <neilb@cse.unsw.edu.au>
- * Paper: Neil Brown
- * School of Computer Science and Engineering
- * The University of New South Wales
- * Sydney, 2052
- * Australia
+ * Email: <neilb@suse.de>
*/
#include "mdadm.h"
#include "md_p.h"
+#include <sys/socket.h>
#include <sys/utsname.h>
+#include <sys/wait.h>
+#include <sys/un.h>
#include <ctype.h>
+#include <dirent.h>
+#include <signal.h>
/*
* following taken from linux/blkpg.h because they aren't
*/
int parse_uuid(char *str, int uuid[4])
{
- int hit = 0; /* number of Hex digIT */
- int i;
- char c;
- for (i=0; i<4; i++) uuid[i]=0;
-
- while ((c= *str++)) {
- int n;
- if (c>='0' && c<='9')
- n = c-'0';
- else if (c>='a' && c <= 'f')
- n = 10 + c - 'a';
- else if (c>='A' && c <= 'F')
- n = 10 + c - 'A';
- else if (strchr(":. -", c))
- continue;
- else return 0;
-
- if (hit<32) {
- uuid[hit/8] <<= 4;
- uuid[hit/8] += n;
- }
- hit++;
- }
- if (hit == 32)
- return 1;
- return 0;
-
+ int hit = 0; /* number of Hex digIT */
+ int i;
+ char c;
+ for (i=0; i<4; i++) uuid[i]=0;
+
+ while ((c= *str++)) {
+ int n;
+ if (c>='0' && c<='9')
+ n = c-'0';
+ else if (c>='a' && c <= 'f')
+ n = 10 + c - 'a';
+ else if (c>='A' && c <= 'F')
+ n = 10 + c - 'A';
+ else if (strchr(":. -", c))
+ continue;
+ else return 0;
+
+ if (hit<32) {
+ uuid[hit/8] <<= 4;
+ uuid[hit/8] += n;
+ }
+ hit++;
+ }
+ if (hit == 32)
+ return 1;
+ return 0;
}
return -1;
}
-
int get_linux_version()
{
struct utsname name;
#endif
}
-int enough(int level, int raid_disks, int layout,
+int enough(int level, int raid_disks, int layout, int clean,
char *avail, int avail_disks)
{
int copies, first;
/* This is the tricky one - we need to check
* which actual disks are present.
*/
- copies = (layout&255)* (layout>>8);
+ copies = (layout&255)* ((layout>>8) & 255);
first=0;
do {
/* there must be one of the 'copies' form 'first' */
return avail_disks >= 1;
case 4:
case 5:
- return avail_disks >= raid_disks-1;
+ if (clean)
+ return avail_disks >= raid_disks-1;
+ else
+ return avail_disks >= raid_disks;
case 6:
- return avail_disks >= raid_disks-2;
+ if (clean)
+ return avail_disks >= raid_disks-2;
+ else
+ return avail_disks >= raid_disks;
default:
return 0;
}
}
+const int uuid_match_any[4] = { ~0, ~0, ~0, ~0 };
int same_uuid(int a[4], int b[4], int swapuuid)
{
+ if (memcmp(a, uuid_match_any, sizeof(int[4])) == 0 ||
+ memcmp(b, uuid_match_any, sizeof(int[4])) == 0)
+ return 1;
+
if (swapuuid) {
/* parse uuids are hostendian.
* uuid's from some superblocks are big-ending
- * if there is a difference, we need to swap..
+ * if there is a difference, we need to swap..
*/
unsigned char *ac = (unsigned char *)a;
unsigned char *bc = (unsigned char *)b;
return 0;
}
}
+void copy_uuid(void *a, int b[4], int swapuuid)
+{
+ if (swapuuid) {
+ /* parse uuids are hostendian.
+ * uuid's from some superblocks are big-ending
+ * if there is a difference, we need to swap..
+ */
+ unsigned char *ac = (unsigned char *)a;
+ unsigned char *bc = (unsigned char *)b;
+ int i;
+ for (i=0; i<16; i+= 4) {
+ ac[i+0] = bc[i+3];
+ ac[i+1] = bc[i+2];
+ ac[i+2] = bc[i+1];
+ ac[i+3] = bc[i+0];
+ }
+ } else
+ memcpy(a, b, 16);
+}
+
+char *fname_from_uuid(struct supertype *st, struct mdinfo *info, char *buf, char sep)
+{
+ int i, j;
+ int id;
+ char uuid[16];
+ char *c = buf;
+ strcpy(c, "UUID-");
+ c += strlen(c);
+ copy_uuid(uuid, info->uuid, st->ss->swapuuid);
+ for (i = 0; i < 4; i++) {
+ id = uuid[i];
+ if (i)
+ *c++ = sep;
+ for (j = 3; j >= 0; j--) {
+ sprintf(c,"%02x", (unsigned char) uuid[j+4*i]);
+ c+= 2;
+ }
+ }
+ return buf;
+}
+#ifndef MDASSEMBLE
int check_ext2(int fd, char *name)
{
/*
fprintf(stderr, Name ": %s appears to contain a reiserfs file system\n",name);
size = sb[0]|(sb[1]|(sb[2]|sb[3]<<8)<<8)<<8;
fprintf(stderr, " size = %luK\n", size*4);
-
+
return 1;
}
int check_raid(int fd, char *name)
{
- void *super;
struct mdinfo info;
time_t crtime;
char *level;
struct supertype *st = guess_super(fd);
if (!st) return 0;
- st->ss->load_super(st, fd, &super, name);
+ st->ss->load_super(st, fd, name);
/* Looks like a raid array .. */
fprintf(stderr, Name ": %s appears to be part of a raid array:\n",
name);
- st->ss->getinfo_super(&info, super);
- free(super);
+ st->ss->getinfo_super(st, &info);
+ st->ss->free_super(st);
crtime = info.array.ctime;
level = map_num(pers, info.array.level);
if (!level) level = "-unknown-";
fprintf(stderr, Name ": assuming 'no'\n");
return 0;
}
+#endif /* MDASSEMBLE */
char *map_num(mapping_t *map, int num)
{
{
/* 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
+ * 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;
if (strncmp(d, "/d",2)==0)
d += 2, type=1; /* /dev/md/dN{pM} */
else if (strncmp(d, "/md_d", 5)==0)
- d += 5, type=1; /* /dev/md_dNpM */
+ d += 5, type=1; /* /dev/md_dN{pM} */
else if (strncmp(d, "/md", 3)==0)
d += 3, type=-1; /* /dev/mdN */
else if (d-dev > 3 && strncmp(d-2, "md/", 3)==0)
int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s)
{
struct stat st;
+
if (S_ISLNK(stb->st_mode)) {
- stat(name, &st);
+ if (stat(name, &st) != 0)
+ return 0;
stb = &st;
}
return ftw(path, add_dev_1, nopenfd);
}
#else
-int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s)
-{
- return 0;
-}
int nftw(const char *path, int (*han)(const char *name, const struct stat *stb, int flag, struct FTW *s), int nopenfd, int flags)
{
return 0;
/*
* Find a block device with the right major/minor number.
* If we find multiple names, choose the shortest.
- * If we find a non-standard name, it is probably there
- * deliberately so prefer it over a standard name.
+ * If we find a name in /dev/md/, we prefer that.
* This applies only to names for MD devices.
*/
char *map_dev(int major, int minor, int create)
{
struct devmap *p;
- char *std = NULL, *nonstd=NULL;
+ char *regular = NULL, *preferred=NULL;
int did_check = 0;
if (major == 0 && minor == 0)
for (p=devlist; p; p=p->next)
if (p->major == major &&
p->minor == minor) {
- if (is_standard(p->name, NULL)) {
- if (std == NULL ||
- strlen(p->name) < strlen(std))
- std = p->name;
+ if (strncmp(p->name, "/dev/md/",8) == 0) {
+ if (preferred == NULL ||
+ strlen(p->name) < strlen(preferred))
+ preferred = p->name;
} else {
- if (nonstd == NULL ||
- strlen(p->name) < strlen(nonstd))
- nonstd = p->name;
+ if (regular == NULL ||
+ strlen(p->name) < strlen(regular))
+ regular = p->name;
}
}
- if (!std && !nonstd && !did_check) {
+ if (!regular && !preferred && !did_check) {
devlist_ready = 0;
goto retry;
}
- if (create && !std && !nonstd) {
+ if (create && !regular && !preferred) {
static char buf[30];
snprintf(buf, sizeof(buf), "%d:%d", major, minor);
- nonstd = buf;
+ regular = buf;
}
- return nonstd ? nonstd : std;
+ return preferred ? preferred : regular;
}
unsigned long calc_csum(void *super, int bytes)
newcsum+= superc[i];
csum = (newcsum& 0xffffffff) + (newcsum>>32);
#ifdef __alpha__
-/* The in-kernel checksum calculation is always 16bit on
+/* The in-kernel checksum calculation is always 16bit on
* the alpha, though it is 32 bit on i386...
* I wonder what it is elsewhere... (it uses and API in
* a way that it shouldn't).
return csum;
}
+#ifndef MDASSEMBLE
char *human_size(long long bytes)
{
static char buf[30];
char *human_size_brief(long long bytes)
{
static char buf[30];
-
if (bytes < 5000*1024)
snprintf(buf, sizeof(buf), "%ld.%02ldKiB",
return buf;
}
+void print_r10_layout(int layout)
+{
+ int near = layout & 255;
+ int far = (layout >> 8) & 255;
+ int offset = (layout&0x10000);
+ char *sep = "";
+
+ if (near != 1) {
+ printf("%s near=%d", sep, near);
+ sep = ",";
+ }
+ if (far != 1)
+ printf("%s %s=%d", sep, offset?"offset":"far", far);
+ if (near*far == 1)
+ printf("NO REDUNDANCY");
+}
+#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;
+}
+
int get_mdp_major(void)
{
static int mdp_major = -1;
return mdp_major;
}
-
-
+#if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
char *get_md_name(int dev)
{
/* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */
unlink(name);
}
+int find_free_devnum(int use_partitions)
+{
+ int devnum;
+ for (devnum = 127; devnum != 128;
+ devnum = devnum ? devnum-1 : (1<<20)-1) {
+ char *dn;
+ int _devnum;
+
+ _devnum = use_partitions ? (-1-devnum) : devnum;
+ if (mddev_busy(_devnum))
+ continue;
+ /* make sure it is new to /dev too, at least as a
+ * non-standard */
+ dn = map_dev(dev2major(_devnum), dev2minor(_devnum), 0);
+ if (dn && ! is_standard(dn, NULL))
+ continue;
+ break;
+ }
+ if (devnum == 128)
+ return NoMdDev;
+ return use_partitions ? (-1-devnum) : devnum;
+}
+#endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
+
int dev_open(char *dev, int flags)
{
/* like 'open', but if 'dev' matches %d:%d, create a temp
if (e > dev && *e == ':' && e[1] &&
(minor = strtoul(e+1, &e, 0)) >= 0 &&
*e == 0) {
- snprintf(devname, sizeof(devname), "/dev/.tmp.md.%d:%d", major, minor);
+ snprintf(devname, sizeof(devname), "/dev/.tmp.md.%d:%d:%d",
+ (int)getpid(), major, minor);
if (mknod(devname, S_IFBLK|0600, makedev(major, minor))==0) {
- fd = open(devname, flags);
+ fd = open(devname, flags|O_DIRECT);
unlink(devname);
}
} else
- fd = open(dev, flags);
+ fd = open(dev, flags|O_DIRECT);
return fd;
}
-struct superswitch *superlist[] = { &super0, &super1, NULL };
+int open_dev(int devnum)
+{
+ char buf[20];
+
+ sprintf(buf, "%d:%d", dev2major(devnum), dev2minor(devnum));
+ return dev_open(buf, O_RDWR);
+}
-struct supertype *super_by_version(int vers, int minor)
+int open_dev_excl(int devnum)
{
- struct supertype *st = malloc(sizeof(*st));
- if (!st) return st;
- if (vers == 0) {
- st->ss = &super0;
- st->max_devs = MD_SB_DISKS;
+ char buf[20];
+ int i;
+
+ sprintf(buf, "%d:%d", dev2major(devnum), dev2minor(devnum));
+ for (i=0 ; i<25 ; i++) {
+ int fd = dev_open(buf, O_RDWR|O_EXCL);
+ if (fd >= 0)
+ return fd;
+ if (errno != EBUSY)
+ return fd;
+ usleep(200000);
+ }
+ return -1;
+}
+
+int same_dev(char *one, char *two)
+{
+ struct stat st1, st2;
+ if (stat(one, &st1) != 0)
+ return 0;
+ if (stat(two, &st2) != 0)
+ return 0;
+ if ((st1.st_mode & S_IFMT) != S_IFBLK)
+ return 0;
+ if ((st2.st_mode & S_IFMT) != S_IFBLK)
+ return 0;
+ return st1.st_rdev == st2.st_rdev;
+}
+
+void wait_for(char *dev, int fd)
+{
+ int i;
+ struct stat stb_want;
+
+ if (fstat(fd, &stb_want) != 0 ||
+ (stb_want.st_mode & S_IFMT) != S_IFBLK)
+ return;
+
+ for (i=0 ; i<25 ; i++) {
+ struct stat stb;
+ if (stat(dev, &stb) == 0 &&
+ (stb.st_mode & S_IFMT) == S_IFBLK &&
+ (stb.st_rdev == stb_want.st_rdev))
+ return;
+ usleep(200000);
+ }
+}
+
+struct superswitch *superlist[] = { &super0, &super1, &super_ddf, &super_imsm, NULL };
+
+#if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
+
+struct supertype *super_by_fd(int fd)
+{
+ mdu_array_info_t array;
+ int vers;
+ int minor;
+ struct supertype *st = NULL;
+ struct mdinfo *sra;
+ char *verstr;
+ char version[20];
+ int i;
+ char *subarray = NULL;
+
+ sra = sysfs_read(fd, 0, GET_VERSION);
+
+ if (sra) {
+ vers = sra->array.major_version;
+ minor = sra->array.minor_version;
+ verstr = sra->text_version;
+ } else {
+ if (ioctl(fd, GET_ARRAY_INFO, &array))
+ array.major_version = array.minor_version = 0;
+ vers = array.major_version;
+ minor = array.minor_version;
+ verstr = "";
}
- if (vers == 1) {
- st->ss = &super1;
- st->max_devs = 384;
+ if (vers != -1) {
+ sprintf(version, "%d.%d", vers, minor);
+ verstr = version;
}
- st->minor_version = minor;
+ if (minor == -2 && is_subarray(verstr)) {
+ char *dev = verstr+1;
+ subarray = strchr(dev, '/');
+ int devnum;
+ if (subarray)
+ *subarray++ = '\0';
+ devnum = devname2devnum(dev);
+ subarray = strdup(subarray);
+ if (sra)
+ sysfs_free(sra);
+ sra = sysfs_read(-1, devnum, GET_VERSION);
+ if (sra && sra->text_version[0])
+ verstr = sra->text_version;
+ else
+ verstr = "-no-metadata-";
+ }
+
+ for (i = 0; st == NULL && superlist[i] ; i++)
+ st = superlist[i]->match_metadata_desc(verstr);
+
+ if (sra)
+ sysfs_free(sra);
+ if (st) {
+ st->sb = NULL;
+ if (subarray) {
+ strncpy(st->subarray, subarray, 32);
+ st->subarray[31] = 0;
+ free(subarray);
+ } else
+ st->subarray[0] = 0;
+ }
+ return st;
+}
+#endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */
+
+
+struct supertype *dup_super(struct supertype *orig)
+{
+ struct supertype *st;
+
+ if (!orig)
+ return orig;
+ st = malloc(sizeof(*st));
+ if (!st)
+ return st;
+ memset(st, 0, sizeof(*st));
+ st->ss = orig->ss;
+ st->max_devs = orig->max_devs;
+ st->minor_version = orig->minor_version;
+ strcpy(st->subarray, orig->subarray);
+ st->sb = NULL;
+ st->info = NULL;
return st;
}
struct supertype *st;
unsigned long besttime = 0;
int bestsuper = -1;
-
- void *sbp = NULL;
int i;
st = malloc(sizeof(*st));
- memset(st, 0, sizeof(*st));
for (i=0 ; superlist[i]; i++) {
int rv;
ss = superlist[i];
- st->ss = NULL;
- rv = ss->load_super(st, fd, &sbp, NULL);
+ memset(st, 0, sizeof(*st));
+ rv = ss->load_super(st, fd, NULL);
if (rv == 0) {
struct mdinfo info;
- ss->getinfo_super(&info, sbp);
+ st->ss->getinfo_super(st, &info);
if (bestsuper == -1 ||
besttime < info.array.ctime) {
bestsuper = i;
besttime = info.array.ctime;
}
- free(sbp);
+ ss->free_super(st);
}
}
if (bestsuper != -1) {
int rv;
- st->ss = NULL;
- rv = superlist[bestsuper]->load_super(st, fd, &sbp, NULL);
+ memset(st, 0, sizeof(*st));
+ rv = superlist[bestsuper]->load_super(st, fd, NULL);
if (rv == 0) {
- free(sbp);
+ superlist[bestsuper]->free_super(st);
return st;
}
}
return NULL;
}
+/* Return size of device in bytes */
+int get_dev_size(int fd, char *dname, unsigned long long *sizep)
+{
+ unsigned long long ldsize;
+ struct stat st;
+
+ if (fstat(fd, &st) != -1 && S_ISREG(st.st_mode))
+ ldsize = (unsigned long long)st.st_size;
+ else
+#ifdef BLKGETSIZE64
+ if (ioctl(fd, BLKGETSIZE64, &ldsize) != 0)
+#endif
+ {
+ unsigned long dsize;
+ if (ioctl(fd, BLKGETSIZE, &dsize) == 0) {
+ ldsize = dsize;
+ ldsize <<= 9;
+ } else {
+ if (dname)
+ fprintf(stderr, Name ": Cannot get size of %s: %s\b",
+ dname, strerror(errno));
+ return 0;
+ }
+ }
+ *sizep = ldsize;
+ return 1;
+}
+
+void get_one_disk(int mdfd, mdu_array_info_t *ainf, mdu_disk_info_t *disk)
+{
+ int d;
+ ioctl(mdfd, GET_ARRAY_INFO, ainf);
+ for (d = 0 ; d < ainf->raid_disks + ainf->nr_disks ; d++)
+ if (ioctl(mdfd, GET_DISK_INFO, disk) == 0)
+ 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;
+ }
+ }
+ closedir(dir);
+ return -1;
+}
+
+int add_disk(int mdfd, struct supertype *st,
+ struct mdinfo *sra, struct mdinfo *info)
+{
+ /* Add a device to an array, in one of 2 ways. */
+ int rv;
+#ifndef MDASSEMBLE
+ if (st->ss->external) {
+ rv = sysfs_add_disk(sra, info,
+ info->disk.state & (1<<MD_DISK_SYNC));
+ if (! rv) {
+ struct mdinfo *sd2;
+ for (sd2 = sra->devs; sd2; sd2=sd2->next)
+ if (sd2 == info)
+ break;
+ if (sd2 == NULL) {
+ sd2 = malloc(sizeof(*sd2));
+ *sd2 = *info;
+ sd2->next = sra->devs;
+ sra->devs = sd2;
+ }
+ }
+ } else
+#endif
+ rv = ioctl(mdfd, ADD_NEW_DISK, &info->disk);
+ return rv;
+}
+
+int set_array_info(int mdfd, struct supertype *st, struct mdinfo *info)
+{
+ /* Initialise kernel's knowledge of array.
+ * This varies between externally managed arrays
+ * and older kernels
+ */
+ int vers = md_get_version(mdfd);
+ int rv;
+
+#ifndef MDASSEMBLE
+ if (st->ss->external)
+ rv = sysfs_set_array(info, vers);
+ else
+#endif
+ if ((vers % 100) >= 1) { /* can use different versions */
+ mdu_array_info_t inf;
+ memset(&inf, 0, sizeof(inf));
+ inf.major_version = info->array.major_version;
+ inf.minor_version = info->array.minor_version;
+ rv = ioctl(mdfd, SET_ARRAY_INFO, &inf);
+ } else
+ rv = ioctl(mdfd, SET_ARRAY_INFO, NULL);
+ return rv;
+}
+
+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 devname2devnum(char *name)
+{
+ char *ep;
+ int num;
+ if (strncmp(name, "md_d", 4)==0)
+ num = -1-strtoul(name+4, &ep, 10);
+ else
+ num = strtoul(name+2, &ep, 10);
+ return num;
+}
+
+int stat2devnum(struct stat *st)
+{
+ char path[30];
+ char link[200];
+ char *cp;
+ int n;
+
+ if ((S_IFMT & st->st_mode) == S_IFBLK) {
+ if (major(st->st_rdev) == MD_MAJOR)
+ return minor(st->st_rdev);
+ else if (major(st->st_rdev) == get_mdp_major())
+ return -1- (minor(st->st_rdev)>>MdpMinorShift);
+
+ /* must be an extended-minor partition. Look at the
+ * /sys/dev/block/%d:%d link which must look like
+ * ../../block/mdXXX/mdXXXpYY
+ */
+ sprintf(path, "/sys/dev/block/%d:%d", major(st->st_rdev),
+ minor(st->st_rdev));
+ n = readlink(path, link, sizeof(link)-1);
+ if (n <= 0)
+ return NoMdDev;
+ link[n] = 0;
+ cp = strrchr(link, '/');
+ if (cp) *cp = 0;
+ cp = strchr(link, '/');
+ if (cp && strncmp(cp, "/md", 3) == 0)
+ return devname2devnum(cp+1);
+ }
+ return NoMdDev;
+
+}
+
+int fd2devnum(int fd)
+{
+ struct stat stb;
+ if (fstat(fd, &stb) == 0)
+ return stat2devnum(&stb);
+ return NoMdDev;
+}
+
+int mdmon_running(int devnum)
+{
+ char path[100];
+ char pid[10];
+ int fd;
+ int n;
+ sprintf(path, "/var/run/mdadm/%s.pid", devnum2devname(devnum));
+ fd = open(path, O_RDONLY, 0);
+
+ if (fd < 0)
+ return 0;
+ n = read(fd, pid, 9);
+ close(fd);
+ if (n <= 0)
+ return 0;
+ if (kill(atoi(pid), 0) == 0)
+ return 1;
+ return 0;
+}
+
+int signal_mdmon(int devnum)
+{
+ char path[100];
+ char pid[10];
+ int fd;
+ int n;
+ sprintf(path, "/var/run/mdadm/%s.pid", devnum2devname(devnum));
+ fd = open(path, O_RDONLY, 0);
+
+ if (fd < 0)
+ return 0;
+ n = read(fd, pid, 9);
+ close(fd);
+ if (n <= 0)
+ return 0;
+ if (kill(atoi(pid), SIGUSR1) == 0)
+ return 1;
+ return 0;
+}
+
+int start_mdmon(int devnum)
+{
+ int i;
+ int len;
+ pid_t pid;
+ int status;
+ char pathbuf[1024];
+ char *paths[4] = {
+ pathbuf,
+ "/sbin/mdmon",
+ "mdmon",
+ NULL
+ };
+
+ if (check_env("MDADM_NO_MDMON"))
+ return 0;
+
+ len = readlink("/proc/self/exe", pathbuf, sizeof(pathbuf));
+ if (len > 0) {
+ char *sl;
+ pathbuf[len] = 0;
+ sl = strrchr(pathbuf, '/');
+ if (sl)
+ sl++;
+ else
+ sl = pathbuf;
+ strcpy(sl, "mdmon");
+ } else
+ pathbuf[0] = '\0';
+
+ switch(fork()) {
+ case 0:
+ /* FIXME yuk. CLOSE_EXEC?? */
+ for (i=3; i < 100; i++)
+ close(i);
+ for (i=0; paths[i]; i++)
+ if (paths[i][0])
+ execl(paths[i], "mdmon",
+ devnum2devname(devnum),
+ NULL);
+ exit(1);
+ case -1: fprintf(stderr, Name ": cannot run mdmon. "
+ "Array remains readonly\n");
+ return -1;
+ default: /* parent - good */
+ pid = wait(&status);
+ if (pid < 0 || status != 0)
+ return -1;
+ }
+ return 0;
+}
+
+int check_env(char *name)
+{
+ char *val = getenv(name);
+
+ if (val && atoi(val) == 1)
+ return 1;
+
+ return 0;
+}
+
+__u32 random32(void)
+{
+ __u32 rv;
+ int rfd = open("/dev/urandom", O_RDONLY);
+ if (rfd < 0 || read(rfd, &rv, 4) != 4)
+ rv = random();
+ if (rfd >= 0)
+ close(rfd);
+ return rv;
+}
+
+#ifndef MDASSEMBLE
+int flush_metadata_updates(struct supertype *st)
+{
+ int sfd;
+ if (!st->updates) {
+ st->update_tail = NULL;
+ return -1;
+ }
+
+ sfd = connect_monitor(devnum2devname(st->container_dev));
+ if (sfd < 0)
+ return -1;
+
+ while (st->updates) {
+ struct metadata_update *mu = st->updates;
+ st->updates = mu->next;
+
+ send_message(sfd, mu, 0);
+ wait_reply(sfd, 0);
+ free(mu->buf);
+ free(mu);
+ }
+ ack(sfd, 0);
+ wait_reply(sfd, 0);
+ close(sfd);
+ st->update_tail = NULL;
+ return 0;
+}
+
+void append_metadata_update(struct supertype *st, void *buf, int len)
+{
+
+ struct metadata_update *mu = malloc(sizeof(*mu));
+
+ mu->buf = buf;
+ mu->len = len;
+ mu->space = NULL;
+ mu->next = NULL;
+ *st->update_tail = mu;
+ st->update_tail = &mu->next;
+}
+#endif /* MDASSEMBLE */
#ifdef __TINYC__
/* tinyc doesn't optimize this check in ioctl.h out ... */
projects / thirdparty / mdadm.git / blobdiff