/* * mdadm - manage Linux "md" devices aka RAID arrays. * * Copyright (C) 2001-2002 Neil Brown * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Author: Neil Brown * Email: * Paper: Neil Brown * School of Computer Science and Engineering * The University of New South Wales * Sydney, 2052 * Australia */ #include "mdadm.h" #include "md_p.h" #include #include /* * Parse a 128 bit uuid in 4 integers * format is 32 hexx nibbles with options :. separator * If not exactly 32 hex digits are found, return 0 * else return 1 */ 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; } /* * Get the md version number. * We use the RAID_VERSION ioctl if it is supported * If not, but we have a block device with major '9', we assume * 0.36.0 * * Return version number as 24 but number - assume version parts * always < 255 */ int md_get_version(int fd) { struct stat stb; mdu_version_t vers; if (fstat(fd, &stb)<0) return -1; if ((S_IFMT&stb.st_mode) != S_IFBLK) return -1; if (ioctl(fd, RAID_VERSION, &vers) == 0) return (vers.major*10000) + (vers.minor*100) + vers.patchlevel; if (errno == EACCES) return -1; if (major(stb.st_rdev) == MD_MAJOR) return (3600); return -1; } int get_linux_version() { struct utsname name; char *cp; int a,b,c; if (uname(&name) <0) return -1; cp = name.release; a = strtoul(cp, &cp, 10); if (*cp != '.') return -1; b = strtoul(cp+1, &cp, 10); if (*cp != '.') return -1; c = strtoul(cp+1, NULL, 10); return (a*1000000)+(b*1000)+c; } int enough(int level, int raid_disks, int avail_disks) { switch (level) { case 10: return 1; /* a lie, but it is hard to tell */ case -4: return avail_disks>= 1; case -1: case 0: return avail_disks == raid_disks; case 1: return avail_disks >= 1; case 4: case 5: return avail_disks >= raid_disks-1; case 6: return avail_disks >= raid_disks-2; default: return 0; } } int same_uuid(int a[4], int b[4]) { if (a[0]==b[0] && a[1]==b[1] && a[2]==b[2] && a[3]==b[3]) return 1; return 0; } void uuid_from_super(int uuid[4], mdp_super_t *super) { uuid[0] = super->set_uuid0; if (super->minor_version >= 90) { uuid[1] = super->set_uuid1; uuid[2] = super->set_uuid2; uuid[3] = super->set_uuid3; } else { uuid[1] = 0; uuid[2] = 0; uuid[3] = 0; } } int compare_super(mdp_super_t *first, mdp_super_t *second) { /* * return: * 0 same, or first was empty, and second was copied * 1 second had wrong number * 2 wrong uuid * 3 wrong other info */ int uuid1[4], uuid2[4]; if (second->md_magic != MD_SB_MAGIC) return 1; if (first-> md_magic != MD_SB_MAGIC) { memcpy(first, second, sizeof(*first)); return 0; } uuid_from_super(uuid1, first); uuid_from_super(uuid2, second); if (!same_uuid(uuid1, uuid2)) return 2; if (first->major_version != second->major_version || first->minor_version != second->minor_version || first->patch_version != second->patch_version || first->gvalid_words != second->gvalid_words || first->ctime != second->ctime || first->level != second->level || first->size != second->size || first->raid_disks != second->raid_disks ) return 3; return 0; } int load_super(int fd, mdp_super_t *super) { /* try to read in the superblock * * return * 0 - success * 1 - no block size * 2 - too small * 3 - no seek * 4 - no read * 5 - no magic * 6 - wrong major version */ unsigned long size; unsigned long long dsize; unsigned long long offset; #ifdef BLKGETSIZE64 if (ioctl(fd, BLKGETSIZE64, &dsize) != 0) #endif { if (ioctl(fd, BLKGETSIZE, &size)) return 1; else dsize = size << 9; } if (dsize < MD_RESERVED_SECTORS*2) return 2; offset = MD_NEW_SIZE_SECTORS(dsize>>9); offset *= 512; ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */ if (lseek64(fd, offset, 0)< 0LL) return 3; if (read(fd, super, sizeof(*super)) != sizeof(*super)) return 4; if (super->md_magic != MD_SB_MAGIC) return 5; if (super->major_version != 0) return 6; return 0; } int store_super(int fd, mdp_super_t *super) { unsigned long size; unsigned long long dsize; long long offset; #ifdef BLKGETSIZE64 if (ioctl(fd, BLKGETSIZE64, &dsize) != 0) #endif { if (ioctl(fd, BLKGETSIZE, &size)) return 1; else dsize = ((unsigned long long)size) << 9; } if (dsize < MD_RESERVED_SECTORS*2) return 2; offset = MD_NEW_SIZE_SECTORS(dsize>>9); offset *= 512; if (lseek64(fd, offset, 0)< 0LL) return 3; if (write(fd, super, sizeof(*super)) != sizeof(*super)) return 4; fsync(fd); return 0; } int check_ext2(int fd, char *name) { /* * Check for an ext2fs file system. * Superblock is always 1K at 1K offset * * s_magic is le16 at 56 == 0xEF53 * report mtime - le32 at 44 * blocks - le32 at 4 * logblksize - le32 at 24 */ unsigned char sb[1024]; time_t mtime; int size, bsize; if (lseek(fd, 1024,0)!= 1024) return 0; if (read(fd, sb, 1024)!= 1024) return 0; if (sb[56] != 0x53 || sb[57] != 0xef) return 0; mtime = sb[44]|(sb[45]|(sb[46]|sb[47]<<8)<<8)<<8; bsize = sb[24]|(sb[25]|(sb[26]|sb[27]<<8)<<8)<<8; size = sb[4]|(sb[5]|(sb[6]|sb[7]<<8)<<8)<<8; fprintf(stderr, Name ": %s appears to contain an ext2fs file system\n", name); fprintf(stderr," size=%dK mtime=%s", size*(1<name) { if (map->num == num) return map->name; map++; } return NULL; } int map_name(mapping_t *map, char *name) { while (map->name) { if (strcmp(map->name, name)==0) return map->num; map++; } return UnSet; } 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 */ char *d = strrchr(dev, '/'); int type=0; int num; if (!d) return 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 */ else if (strncmp(d, "/md", 3)==0) d += 3, type=-1; /* /dev/mdN */ else if (d-dev > 3 && strncmp(d-2, "md/", 3)==0) type = -1; /* /dev/md/N */ else return 0; if (!*d) return 0; num = atoi(d); while (isdigit(*d)) d++; if (*d) return 0; if (nump) *nump = num; return type; } /* * convert a major/minor pair for a block device into a name in /dev, if possible. * On the first call, walk /dev collecting name. * Put them in a simple linked listfor now. */ struct devmap { int major, minor; char *name; struct devmap *next; } *devlist = NULL; int devlist_ready = 0; #ifdef UCLIBC char *map_dev(int major, int minor) { #if 0 fprintf(stderr, "Warning - fail to map %d,%d to a device name\n", major, minor); #endif return NULL; } #else #define __USE_XOPEN_EXTENDED #include #ifndef __dietlibc__ int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s) #else int add_dev(const char *name, const struct stat *stb, int flag) #endif { if ((stb->st_mode&S_IFMT)== S_IFBLK) { char *n = strdup(name); struct devmap *dm = malloc(sizeof(*dm)); if (dm) { dm->major = major(stb->st_rdev); dm->minor = minor(stb->st_rdev); dm->name = n; dm->next = devlist; devlist = dm; } } return 0; } /* * Find a block device with the right major/minor number. * Avoid /dev/mdNN and /dev/md/dNN if possible */ char *map_dev(int major, int minor) { struct devmap *p; char *std = NULL; if (!devlist_ready) { #ifndef __dietlibc__ nftw("/dev", add_dev, 10, FTW_PHYS); #else ftw("/dev", add_dev, 10); #endif devlist_ready=1; } for (p=devlist; p; p=p->next) if (p->major == major && p->minor == minor) { if (is_standard(p->name, NULL)) std = p->name; else return p->name; } return std; } #endif unsigned long calc_sb_csum(mdp_super_t *super) { unsigned int oldcsum = super->sb_csum; unsigned long long newcsum = 0; unsigned long csum; int i; unsigned int *superc = (int*) super; super->sb_csum = 0; for(i=0; i>32); super->sb_csum = oldcsum; return csum; } char *human_size(long long bytes) { static char buf[30]; if (bytes < 5000*1024) buf[0]=0; else if (bytes < 2*1024LL*1024LL*1024LL) sprintf(buf, " (%ld.%02ld MiB %ld.%02ld MB)", (long)(bytes>>20), (long)((bytes&0xfffff)+0x100000/200)/(0x100000/100), (long)(bytes/1000/1000), (long)(((bytes%1000000)+5000)/10000) ); else sprintf(buf, " (%ld.%02ld GiB %ld.%02ld GB)", (long)(bytes>>30), (long)(((bytes>>10)&0xfffff)+0x100000/200)/(0x100000/100), (long)(bytes/1000LL/1000LL/1000LL), (long)((((bytes/1000)%1000000)+5000)/10000) ); return buf; } char *human_size_brief(long long bytes) { static char buf[30]; if (bytes < 5000*1024) sprintf(buf, "%ld.%02ldKiB", (long)(bytes>>10), (long)(((bytes&1023)*100+512)/1024) ); else if (bytes < 2*1024LL*1024LL*1024LL) sprintf(buf, "%ld.%02ldMiB", (long)(bytes>>20), (long)((bytes&0xfffff)+0x100000/200)/(0x100000/100) ); else sprintf(buf, "%ld.%02ldGiB", (long)(bytes>>30), (long)(((bytes>>10)&0xfffff)+0x100000/200)/(0x100000/100) ); return buf; } int get_mdp_major(void) { static int mdp_major = -1; FILE *fl; char *w; int have_block = 0; int have_devices = 0; int last_num = -1; if (mdp_major != -1) return mdp_major; fl = fopen("/proc/devices", "r"); if (!fl) return -1; while ((w = conf_word(fl, 1))) { if (have_block && strcmp(w, "devices:")==0) have_devices = 1; have_block = (strcmp(w, "Block")==0); if (isdigit(w[0])) last_num = atoi(w); if (have_devices && strcmp(w, "mdp")==0) mdp_major = last_num; free(w); } fclose(fl); return mdp_major; } char *get_md_name(int dev) { /* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */ /* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */ static char devname[50]; struct stat stb; dev_t rdev; char *dn; if (dev < 0) { int mdp = get_mdp_major(); if (mdp < 0) return NULL; rdev = makedev(mdp, (-1-dev)<<6); sprintf(devname, "/dev/md/d%d", -1-dev); if (stat(devname, &stb) == 0 && (S_IFMT&stb.st_mode) == S_IFBLK && (stb.st_rdev == rdev)) return devname; } else { rdev = makedev(MD_MAJOR, dev); sprintf(devname, "/dev/md%d", dev); if (stat(devname, &stb) == 0 && (S_IFMT&stb.st_mode) == S_IFBLK && (stb.st_rdev == rdev)) return devname; sprintf(devname, "/dev/md/%d", dev); if (stat(devname, &stb) == 0 && (S_IFMT&stb.st_mode) == S_IFBLK && (stb.st_rdev == rdev)) return devname; } dn = map_dev(major(rdev), minor(rdev)); if (dn) return dn; sprintf(devname, "/dev/.tmp.md%d", dev); if (mknod(devname, S_IFBLK | 0600, rdev) == -1) if (errno != EEXIST) return NULL; if (stat(devname, &stb) == 0 && (S_IFMT&stb.st_mode) == S_IFBLK && (stb.st_rdev == rdev)) return devname; unlink(devname); return NULL; } void put_md_name(char *name) { if (strncmp(name, "/dev/.tmp.md", 12)==0) unlink(name); }