X-Git-Url: http://git.ipfire.org/?p=thirdparty%2Fmdadm.git;a=blobdiff_plain;f=util.c;h=08c6bb0b0e977acbb8c2bba724a96f456b1e58cd;hp=f57613f533a993f4e72b9aeea6bbb52cc451eb8c;hb=6adfd3affda071d1083497d150a1150ade0e3fdb;hpb=8e22992203e25ae0b7bdf41cf2c53b11024d64cc diff --git a/util.c b/util.c index f57613f5..08c6bb0b 100644 --- a/util.c +++ b/util.c @@ -31,6 +31,8 @@ #include "md_p.h" #include #include +#include +#include /* * following taken from linux/blkpg.h because they aren't @@ -73,33 +75,32 @@ struct blkpg_partition { */ 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; + 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++; } - hit++; - } - if (hit == 32) - return 1; - return 0; - + if (hit == 32) + return 1; + return 0; } @@ -132,7 +133,6 @@ int md_get_version(int fd) return -1; } - int get_linux_version() { struct utsname name; @@ -224,7 +224,7 @@ int same_uuid(int a[4], 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.. + * if there is a difference, we need to swap.. */ unsigned char *ac = (unsigned char *)a; unsigned char *bc = (unsigned char *)b; @@ -318,25 +318,24 @@ int check_reiser(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-"; @@ -391,7 +390,10 @@ 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 + * 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; @@ -546,7 +548,7 @@ 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). @@ -592,7 +594,6 @@ char *human_size(long long bytes) char *human_size_brief(long long bytes) { static char buf[30]; - if (bytes < 5000*1024) snprintf(buf, sizeof(buf), "%ld.%02ldKiB", @@ -612,6 +613,23 @@ 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) { @@ -696,6 +714,29 @@ void put_md_name(char *name) if (strncmp(name, "/dev/.tmp.md", 12)==0) unlink(name); } + +int find_free_devnum(int use_partitions) +{ + int devnum; + for (devnum = 127; devnum != 128; + devnum = devnum ? devnum-1 : (1<<22)-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) @@ -715,7 +756,8 @@ int dev_open(char *dev, int flags) 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); unlink(devname); @@ -725,22 +767,86 @@ int dev_open(char *dev, int flags) return fd; } -struct superswitch *superlist[] = { &super0, &super1, NULL }; +int open_dev_excl(int devnum) +{ + 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; +} + +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_version(int vers, int minor) +struct supertype *super_by_fd(int fd) { - struct supertype *st = malloc(sizeof(*st)); - if (!st) return st; - if (vers == 0) { - st->ss = &super0; - st->max_devs = MD_SB_DISKS; + mdu_array_info_t array; + int vers; + int minor; + struct supertype *st = NULL; + struct mdinfo *sra; + char *verstr; + char version[20]; + int i; + + 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 && 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); + if (st) + st->sb = NULL; + return st; +} +#endif /* !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO) */ + + +struct supertype *dup_super(struct supertype *orig) +{ + struct supertype *st; + + 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; + st->sb = NULL; + st->info = NULL; return st; } @@ -753,34 +859,31 @@ struct supertype *guess_super(int fd) 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; } } @@ -792,6 +895,11 @@ struct supertype *guess_super(int fd) 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 @@ -819,6 +927,122 @@ void get_one_disk(int mdfd, mdu_array_info_t *ainf, mdu_disk_info_t *disk) 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; +} + +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; +} + +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; +} + + + #ifdef __TINYC__ /* tinyc doesn't optimize this check in ioctl.h out ... */ unsigned int __invalid_size_argument_for_IOC = 0;