/* * mdadm - manage Linux "md" devices aka RAID arrays. * * Copyright (C) 2001-2013 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: */ #include "mdadm.h" #include "md_p.h" #include #include #include #include #include #include #include #include #include #include #include #include #include /* * following taken from linux/blkpg.h because they aren't * anywhere else and it isn't safe to #include linux/ * stuff. */ #define BLKPG _IO(0x12,105) /* The argument structure */ struct blkpg_ioctl_arg { int op; int flags; int datalen; void *data; }; /* The subfunctions (for the op field) */ #define BLKPG_ADD_PARTITION 1 #define BLKPG_DEL_PARTITION 2 /* Sizes of name fields. Unused at present. */ #define BLKPG_DEVNAMELTH 64 #define BLKPG_VOLNAMELTH 64 /* The data structure for ADD_PARTITION and DEL_PARTITION */ struct blkpg_partition { long long start; /* starting offset in bytes */ long long length; /* length in bytes */ int pno; /* partition number */ char devname[BLKPG_DEVNAMELTH]; /* partition name, like sda5 or c0d1p2, to be used in kernel messages */ char volname[BLKPG_VOLNAMELTH]; /* volume label */ }; #include "part.h" /* Force a compilation error if condition is true */ #define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition)) /* Force a compilation error if condition is true, but also produce a result (of value 0 and type size_t), so the expression can be used e.g. in a structure initializer (or where-ever else comma expressions aren't permitted). */ #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) static int is_dlm_hooks_ready = 0; int dlm_funs_ready(void) { return is_dlm_hooks_ready ? 1 : 0; } static struct dlm_hooks *dlm_hooks = NULL; struct dlm_lock_resource *dlm_lock_res = NULL; static int ast_called = 0; struct dlm_lock_resource { dlm_lshandle_t *ls; struct dlm_lksb lksb; }; /* Using poll(2) to wait for and dispatch ASTs */ static int poll_for_ast(dlm_lshandle_t ls) { struct pollfd pfd; pfd.fd = dlm_hooks->ls_get_fd(ls); pfd.events = POLLIN; while (!ast_called) { if (poll(&pfd, 1, 0) < 0) { perror("poll"); return -1; } dlm_hooks->dispatch(dlm_hooks->ls_get_fd(ls)); } ast_called = 0; return 0; } static void dlm_ast(void *arg) { ast_called = 1; } static char *cluster_name = NULL; /* Create the lockspace, take bitmapXXX locks on all the bitmaps. */ int cluster_get_dlmlock(void) { int ret = -1; char str[64]; int flags = LKF_NOQUEUE; int retry_count = 0; if (!dlm_funs_ready()) { pr_err("Something wrong with dlm library\n"); return -1; } ret = get_cluster_name(&cluster_name); if (ret) { pr_err("The md can't get cluster name\n"); return -1; } dlm_lock_res = xmalloc(sizeof(struct dlm_lock_resource)); dlm_lock_res->ls = dlm_hooks->open_lockspace(cluster_name); if (!dlm_lock_res->ls) { dlm_lock_res->ls = dlm_hooks->create_lockspace(cluster_name, O_RDWR); if (!dlm_lock_res->ls) { pr_err("%s failed to create lockspace\n", cluster_name); return -ENOMEM; } } else { pr_err("open existed %s lockspace\n", cluster_name); } snprintf(str, 64, "bitmap%s", cluster_name); retry: ret = dlm_hooks->ls_lock(dlm_lock_res->ls, LKM_PWMODE, &dlm_lock_res->lksb, flags, str, strlen(str), 0, dlm_ast, dlm_lock_res, NULL, NULL); if (ret) { pr_err("error %d when get PW mode on lock %s\n", errno, str); /* let's try several times if EAGAIN happened */ if (dlm_lock_res->lksb.sb_status == EAGAIN && retry_count < 10) { sleep_for(10, 0, true); retry_count++; goto retry; } dlm_hooks->release_lockspace(cluster_name, dlm_lock_res->ls, 1); return ret; } /* Wait for it to complete */ poll_for_ast(dlm_lock_res->ls); if (dlm_lock_res->lksb.sb_status) { pr_err("failed to lock cluster\n"); return -1; } return 1; } int cluster_release_dlmlock(void) { int ret = -1; if (!cluster_name) goto out; if (!dlm_lock_res->lksb.sb_lkid) goto out; ret = dlm_hooks->ls_unlock_wait(dlm_lock_res->ls, dlm_lock_res->lksb.sb_lkid, 0, &dlm_lock_res->lksb); if (ret) { pr_err("error %d happened when unlock\n", errno); /* XXX make sure the lock is unlocked eventually */ goto out; } /* Wait for it to complete */ poll_for_ast(dlm_lock_res->ls); errno = dlm_lock_res->lksb.sb_status; if (errno != EUNLOCK) { pr_err("error %d happened in ast when unlock lockspace\n", errno); /* XXX make sure the lockspace is unlocked eventually */ goto out; } ret = dlm_hooks->release_lockspace(cluster_name, dlm_lock_res->ls, 1); if (ret) { pr_err("error %d happened when release lockspace\n", errno); /* XXX make sure the lockspace is released eventually */ goto out; } free(dlm_lock_res); out: return ret; } int md_array_valid(int fd) { struct mdinfo *sra; int ret; sra = sysfs_read(fd, NULL, GET_ARRAY_STATE); if (sra) { if (sra->array_state != ARRAY_UNKNOWN_STATE) ret = 0; else ret = -ENODEV; free(sra); } else { /* * GET_ARRAY_INFO doesn't provide access to the proper state * information, so fallback to a basic check for raid_disks != 0 */ ret = ioctl(fd, RAID_VERSION); } return !ret; } int md_array_active(int fd) { struct mdinfo *sra; struct mdu_array_info_s array; int ret = 0; sra = sysfs_read(fd, NULL, GET_ARRAY_STATE); if (sra) { if (!md_array_is_active(sra)) ret = -ENODEV; free(sra); } else { /* * GET_ARRAY_INFO doesn't provide access to the proper state * information, so fallback to a basic check for raid_disks != 0 */ ret = md_get_array_info(fd, &array); } return !ret; } int md_array_is_active(struct mdinfo *info) { return (info->array_state != ARRAY_CLEAR && info->array_state != ARRAY_INACTIVE && info->array_state != ARRAY_UNKNOWN_STATE); } /* * Get array info from the kernel. Longer term we want to deprecate the * ioctl and get it from sysfs. */ int md_get_array_info(int fd, struct mdu_array_info_s *array) { return ioctl(fd, GET_ARRAY_INFO, array); } /* * Set array info */ int md_set_array_info(int fd, struct mdu_array_info_s *array) { return ioctl(fd, SET_ARRAY_INFO, array); } /* * Get disk info from the kernel. */ int md_get_disk_info(int fd, struct mdu_disk_info_s *disk) { return ioctl(fd, GET_DISK_INFO, disk); } int get_linux_version() { struct utsname name; char *cp; int a = 0, b = 0,c = 0; if (uname(&name) <0) return -1; cp = name.release; a = strtoul(cp, &cp, 10); if (*cp == '.') b = strtoul(cp+1, &cp, 10); if (*cp == '.') c = strtoul(cp+1, &cp, 10); return (a*1000000)+(b*1000)+c; } int mdadm_version(char *version) { int a, b, c; char *cp; if (!version) version = Version; cp = strchr(version, '-'); if (!cp || *(cp+1) != ' ' || *(cp+2) != 'v') return -1; cp += 3; a = strtoul(cp, &cp, 10); if (*cp != '.') return -1; b = strtoul(cp+1, &cp, 10); if (*cp == '.') c = strtoul(cp+1, &cp, 10); else c = 0; if (*cp != ' ' && *cp != '-') return -1; return (a*1000000)+(b*1000)+c; } unsigned long long parse_size(char *size) { /* parse 'size' which should be a number optionally * followed by 'K', 'M'. 'G' or 'T'. * Without a suffix, K is assumed. * Number returned is in sectors (half-K) * INVALID_SECTORS returned on error. */ char *c; long long s = strtoll(size, &c, 10); if (s > 0) { switch (*c) { case 'K': c++; default: s *= 2; break; case 'M': c++; s *= 1024 * 2; break; case 'G': c++; s *= 1024 * 1024 * 2; break; case 'T': c++; s *= 1024 * 1024 * 1024 * 2LL; break; case 's': /* sectors */ c++; break; } } else s = INVALID_SECTORS; if (*c) s = INVALID_SECTORS; return s; } int is_near_layout_10(int layout) { int fc, fo; fc = (layout >> 8) & 255; fo = layout & (1 << 16); if (fc > 1 || fo > 0) return 0; return 1; } int parse_layout_10(char *layout) { int copies, rv; char *cp; /* Parse the layout string for raid10 */ /* 'f', 'o' or 'n' followed by a number <= raid_disks */ if ((layout[0] != 'n' && layout[0] != 'f' && layout[0] != 'o') || (copies = strtoul(layout+1, &cp, 10)) < 1 || copies > 200 || *cp) return -1; if (layout[0] == 'n') rv = 256 + copies; else if (layout[0] == 'o') rv = 0x10000 + (copies<<8) + 1; else rv = 1 + (copies<<8); return rv; } int parse_layout_faulty(char *layout) { int ln, mode; char *m; if (!layout) return -1; /* Parse the layout string for 'faulty' */ ln = strcspn(layout, "0123456789"); m = xstrdup(layout); m[ln] = 0; mode = map_name(faultylayout, m); free(m); if (mode == UnSet) return -1; return mode | (atoi(layout+ln)<< ModeShift); } int parse_cluster_confirm_arg(char *input, char **devname, int *slot) { char *dev; *slot = strtoul(input, &dev, 10); if (dev == input || dev[0] != ':') return -1; *devname = dev+1; return 0; } void remove_partitions(int fd) { /* remove partitions from this block devices. * This is used for components added to an array */ #ifdef BLKPG_DEL_PARTITION struct blkpg_ioctl_arg a; struct blkpg_partition p; a.op = BLKPG_DEL_PARTITION; a.data = (void*)&p; a.datalen = sizeof(p); a.flags = 0; memset(a.data, 0, a.datalen); for (p.pno = 0; p.pno < 16; p.pno++) ioctl(fd, BLKPG, &a); #endif } int test_partition(int fd) { /* Check if fd is a whole-disk or a partition. * BLKPG will return EINVAL on a partition, and BLKPG_DEL_PARTITION * will return ENXIO on an invalid partition number. */ struct blkpg_ioctl_arg a; struct blkpg_partition p; a.op = BLKPG_DEL_PARTITION; a.data = (void*)&p; a.datalen = sizeof(p); a.flags = 0; memset(a.data, 0, a.datalen); p.pno = 1<<30; if (ioctl(fd, BLKPG, &a) == 0) /* Very unlikely, but not a partition */ return 0; if (errno == ENXIO || errno == ENOTTY) /* not a partition */ return 0; return 1; } int test_partition_from_id(dev_t id) { char buf[20]; int fd, rv; sprintf(buf, "%d:%d", major(id), minor(id)); fd = dev_open(buf, O_RDONLY); if (fd < 0) return -1; rv = test_partition(fd); close(fd); return rv; } int enough(int level, int raid_disks, int layout, int clean, char *avail) { int copies, first; int i; int avail_disks = 0; if (raid_disks <= 0) return 0; for (i = 0; i < raid_disks; i++) avail_disks += !!avail[i]; switch (level) { case 10: /* This is the tricky one - we need to check * which actual disks are present. */ copies = (layout & 255) * ((layout >> 8) & 255); first = 0; do { /* there must be one of the 'copies' form 'first' */ int n = copies; int cnt = 0; int this = first; while (n--) { if (avail[this]) cnt++; this = (this + 1) % raid_disks; } if (cnt == 0) return 0; first = (first + (layout & 255)) % raid_disks; } while (first != 0); return 1; case LEVEL_MULTIPATH: return avail_disks >= 1; case LEVEL_LINEAR: case 0: return avail_disks == raid_disks; case 1: return avail_disks >= 1; case 4: if (avail_disks == raid_disks - 1 && !avail[raid_disks - 1]) /* If just the parity device is missing, then we * have enough, even if not clean */ return 1; /* FALL THROUGH */ case 5: if (clean) return avail_disks >= raid_disks - 1; else return avail_disks >= raid_disks; case 6: if (clean) return avail_disks >= raid_disks - 2; else return avail_disks >= raid_disks; default: return 0; } } char *__fname_from_uuid(int id[4], int swap, char *buf, char sep) { int i, j; char uuid[16]; char *c = buf; strcpy(c, "UUID-"); c += strlen(c); copy_uuid(uuid, id, swap); for (i = 0; i < 4; i++) { if (i) *c++ = sep; for (j = 3; j >= 0; j--) { sprintf(c,"%02x", (unsigned char) uuid[j+4*i]); c+= 2; } } return buf; } /** * fname_from_uuid() - generate uuid string. Should not be used with super1. * @info: info with uuid * @buf: buf to fill. * * This routine should not be used with super1. See detail_fname_from_uuid() for details. It does * not use superswitch swapuuid as it should be 0 but it has to do UUID conversion if host is big * endian- left for backward compatibility. */ char *fname_from_uuid(struct mdinfo *info, char *buf) { #if __BYTE_ORDER == BIG_ENDIAN return __fname_from_uuid(info->uuid, true, buf, ':'); #else return __fname_from_uuid(info->uuid, false, buf, ':'); #endif } 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; unsigned long long size; int 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; size <<= bsize; pr_info("%s appears to contain an ext2fs file system\n", name); pr_info("size=%lluK mtime=%s", size, ctime(&mtime)); return 1; } int check_reiser(int fd, char *name) { /* * superblock is at 64K * size is 1024; * Magic string "ReIsErFs" or "ReIsEr2Fs" at 52 * */ unsigned char sb[1024]; unsigned long long size; if (lseek(fd, 64*1024, 0) != 64*1024) return 0; if (read(fd, sb, 1024) != 1024) return 0; if (strncmp((char*)sb+52, "ReIsErFs",8) != 0 && strncmp((char*)sb+52, "ReIsEr2Fs",9) != 0) return 0; pr_err("%s appears to contain a reiserfs file system\n",name); size = sb[0]|(sb[1]|(sb[2]|sb[3]<<8)<<8)<<8; cont_err("size = %lluK\n", size*4); return 1; } int check_raid(int fd, char *name) { struct mdinfo info; time_t crtime; char *level; struct supertype *st = guess_super(fd); if (!st) return 0; if (st->ss->add_to_super != NULL) { st->ss->load_super(st, fd, name); /* Looks like a raid array .. */ pr_err("%s appears to be part of a raid array:\n", name); st->ss->getinfo_super(st, &info, NULL); st->ss->free_super(st); crtime = info.array.ctime; level = map_num(pers, info.array.level); if (!level) level = "-unknown-"; cont_err("level=%s devices=%d ctime=%s", level, info.array.raid_disks, ctime(&crtime)); } else { /* Looks like GPT or MBR */ pr_err("partition table exists on %s\n", name); } return 1; } int fstat_is_blkdev(int fd, char *devname, dev_t *rdev) { struct stat stb; if (fstat(fd, &stb) != 0) { pr_err("fstat failed for %s: %s\n", devname, strerror(errno)); return 0; } if ((S_IFMT & stb.st_mode) != S_IFBLK) { pr_err("%s is not a block device.\n", devname); return 0; } if (rdev) *rdev = stb.st_rdev; return 1; } int stat_is_blkdev(char *devname, dev_t *rdev) { struct stat stb; if (stat(devname, &stb) != 0) { pr_err("stat failed for %s: %s\n", devname, strerror(errno)); return 0; } if ((S_IFMT & stb.st_mode) != S_IFBLK) { pr_err("%s is not a block device.\n", devname); return 0; } if (rdev) *rdev = stb.st_rdev; return 1; } /** * ask() - prompt user for "yes/no" dialog. * @mesg: message to be printed, without '?' sign. * Returns: 1 if 'Y/y', 0 otherwise. * * The default value is 'N/n', thus the caps on "N" on prompt. */ int ask(char *mesg) { char buf[3] = {0}; fprintf(stderr, "%s [y/N]? ", mesg); fflush(stderr); if (fgets(buf, 3, stdin) == NULL) return 0; if (strlen(buf) == 1) { pr_err("assuming no.\n"); return 0; } if (buf[1] != '\n') goto bad_option; if (toupper(buf[0]) == 'Y') return 1; if (toupper(buf[0]) == 'N') return 0; bad_option: pr_err("bad option.\n"); return 0; } 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 * Returns 1 if a partitionable standard, * -1 if non-partitonable, * 0 if not a standard name. */ 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_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) d += 1, 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; } unsigned long calc_csum(void *super, int bytes) { unsigned long long newcsum = 0; int i; unsigned int csum; unsigned int *superc = (unsigned int*) super; for(i = 0; i < bytes/4; i++) newcsum += superc[i]; csum = (newcsum& 0xffffffff) + (newcsum>>32); #ifdef __alpha__ /* 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 an API in * a way that it shouldn't). */ csum = (csum & 0xffff) + (csum >> 16); csum = (csum & 0xffff) + (csum >> 16); #endif return csum; } char *human_size(long long bytes) { static char buf[47]; /* We convert bytes to either centi-M{ega,ibi}bytes, * centi-G{igi,ibi}bytes or centi-T{era,ebi}bytes * with appropriate rounding, and then print * 1/100th of those as a decimal. * We allow upto 2048Megabytes before converting to * gigabytes and 2048Gigabytes before converting to * terabytes, as that shows more precision and isn't * too large a number. */ if (bytes < 5000*1024) buf[0] = 0; else if (bytes < 2*1024LL*1024LL*1024LL) { long cMiB = (bytes * 200LL / (1LL<<20) + 1) / 2; long cMB = (bytes / ( 1000000LL / 200LL ) +1) /2; snprintf(buf, sizeof(buf), " (%ld.%02ld MiB %ld.%02ld MB)", cMiB/100, cMiB % 100, cMB/100, cMB % 100); } else if (bytes < 2*1024LL*1024LL*1024LL*1024LL) { long cGiB = (bytes * 200LL / (1LL<<30) +1) / 2; long cGB = (bytes / (1000000000LL/200LL ) +1) /2; snprintf(buf, sizeof(buf), " (%ld.%02ld GiB %ld.%02ld GB)", cGiB/100, cGiB % 100, cGB/100, cGB % 100); } else { long cTiB = (bytes * 200LL / (1LL<<40) + 1) / 2; long cTB = (bytes / (1000000000000LL / 200LL) + 1) / 2; snprintf(buf, sizeof(buf), " (%ld.%02ld TiB %ld.%02ld TB)", cTiB/100, cTiB % 100, cTB/100, cTB % 100); } return buf; } char *human_size_brief(long long bytes, int prefix) { static char buf[30]; /* We convert bytes to either centi-M{ega,ibi}bytes, * centi-G{igi,ibi}bytes or centi-T{era,ebi}bytes * with appropriate rounding, and then print * 1/100th of those as a decimal. * We allow upto 2048Megabytes before converting to * gigabytes and 2048Gigabytes before converting to * terabytes, as that shows more precision and isn't * too large a number. * * If prefix == IEC, we mean prefixes like kibi,mebi,gibi etc. * If prefix == JEDEC, we mean prefixes like kilo,mega,giga etc. */ if (bytes < 5000*1024) buf[0] = 0; else if (prefix == IEC) { if (bytes < 2*1024LL*1024LL*1024LL) { long cMiB = (bytes * 200LL / (1LL<<20) +1) /2; snprintf(buf, sizeof(buf), "%ld.%02ldMiB", cMiB/100, cMiB % 100); } else if (bytes < 2*1024LL*1024LL*1024LL*1024LL) { long cGiB = (bytes * 200LL / (1LL<<30) +1) /2; snprintf(buf, sizeof(buf), "%ld.%02ldGiB", cGiB/100, cGiB % 100); } else { long cTiB = (bytes * 200LL / (1LL<<40) + 1) / 2; snprintf(buf, sizeof(buf), "%ld.%02ldTiB", cTiB/100, cTiB % 100); } } else if (prefix == JEDEC) { if (bytes < 2*1024LL*1024LL*1024LL) { long cMB = (bytes / ( 1000000LL / 200LL ) +1) /2; snprintf(buf, sizeof(buf), "%ld.%02ldMB", cMB/100, cMB % 100); } else if (bytes < 2*1024LL*1024LL*1024LL*1024LL) { long cGB = (bytes / (1000000000LL/200LL ) +1) /2; snprintf(buf, sizeof(buf), "%ld.%02ldGB", cGB/100, cGB % 100); } else { long cTB = (bytes / (1000000000000LL / 200LL) + 1) / 2; snprintf(buf, sizeof(buf), "%ld.%02ldTB", cTB/100, cTB % 100); } } else buf[0] = 0; 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"); } unsigned long long calc_array_size(int level, int raid_disks, int layout, int chunksize, unsigned long long devsize) { if (level == 1) return devsize; devsize &= ~(unsigned long long)((chunksize>>9)-1); return get_data_disks(level, layout, raid_disks) * devsize; } int get_data_disks(int level, int layout, int raid_disks) { 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; } return data_disks; } dev_t devnm2devid(char *devnm) { /* First look in /sys/block/$DEVNM/dev for %d:%d * If that fails, try parsing out a number */ char path[PATH_MAX]; char *ep; int fd; int mjr,mnr; snprintf(path, sizeof(path), "/sys/block/%s/dev", devnm); fd = open(path, O_RDONLY); if (fd >= 0) { char buf[20]; int n = read(fd, buf, sizeof(buf)); close(fd); if (n > 0) buf[n] = 0; if (n > 0 && sscanf(buf, "%d:%d\n", &mjr, &mnr) == 2) return makedev(mjr, mnr); } if (strncmp(devnm, "md_d", 4) == 0 && isdigit(devnm[4]) && (mnr = strtoul(devnm+4, &ep, 10)) >= 0 && ep > devnm && *ep == 0) return makedev(get_mdp_major(), mnr << MdpMinorShift); if (strncmp(devnm, "md", 2) == 0 && isdigit(devnm[2]) && (mnr = strtoul(devnm+2, &ep, 10)) >= 0 && ep > devnm && *ep == 0) return makedev(MD_MAJOR, mnr); return 0; } /** * is_devname_numbered() - helper for numbered devname verification. * @devname: path or name to check. * @pref: expected devname prefix. * @pref_len: prefix len. */ static bool is_devname_numbered(const char *devname, const char *pref, const int pref_len) { int val; assert(devname && pref); if (strncmp(devname, pref, pref_len) != 0) return false; if (parse_num(&val, devname + pref_len) != 0) return false; if (val > 1024) return false; return true; } /** * is_devname_md_numbered() - check if &devname is numbered MD device (md). * @devname: path or name to check. */ bool is_devname_md_numbered(const char *devname) { return is_devname_numbered(devname, DEV_NUM_PREF, DEV_NUM_PREF_LEN); } /** * is_devname_md_d_numbered() - check if &devname is secondary numbered MD device (md_d). * @devname: path or name to check. */ bool is_devname_md_d_numbered(const char *devname) { static const char d_dev[] = DEV_NUM_PREF "_d"; return is_devname_numbered(devname, d_dev, sizeof(d_dev) - 1); } /** * get_md_name() - Get main dev node of the md device. * @devnm: Md device name or path. * * Function checks if the full name was passed and returns md name * if it is the MD device. * * Return: Main dev node of the md device or NULL if not found. */ char *get_md_name(char *devnm) { static char devname[NAME_MAX]; struct stat stb; if (strncmp(devnm, "/dev/", 5) == 0) snprintf(devname, sizeof(devname), "%s", devnm); else snprintf(devname, sizeof(devname), "/dev/%s", devnm); if (!is_mddev(devname)) return NULL; if (stat(devname, &stb) == 0 && (S_IFMT&stb.st_mode) == S_IFBLK) return devname; return NULL; } void put_md_name(char *name) { if (strncmp(name, "/dev/.tmp.md", 12) == 0) unlink(name); } int get_maj_min(char *dev, int *major, int *minor) { char *e; *major = strtoul(dev, &e, 0); return (e > dev && *e == ':' && e[1] && (*minor = strtoul(e+1, &e, 0)) >= 0 && *e == 0); } /** * is_bit_set() - get bit value by index. * @val: value. * @index: index of the bit (LSB numbering). * * Return: bit value. */ bool is_bit_set(int *val, unsigned char index) { if ((*val) & (1 << index)) return true; return false; } int dev_open(char *dev, int flags) { /* like 'open', but if 'dev' matches %d:%d, create a temp * block device and open that */ int fd = -1; char devname[32]; int major; int minor; if (!dev) return -1; flags |= O_DIRECT; if (get_maj_min(dev, &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); } if (fd < 0) { /* Try /tmp as /dev appear to be read-only */ snprintf(devname, sizeof(devname), "/tmp/.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); } } } else fd = open(dev, flags); return fd; } int open_dev_flags(char *devnm, int flags) { dev_t devid; char buf[20]; devid = devnm2devid(devnm); sprintf(buf, "%d:%d", major(devid), minor(devid)); return dev_open(buf, flags); } int open_dev(char *devnm) { return open_dev_flags(devnm, O_RDONLY); } int open_dev_excl(char *devnm) { char buf[20]; int i; int flags = O_RDWR; dev_t devid = devnm2devid(devnm); unsigned int delay = 1; // miliseconds sprintf(buf, "%d:%d", major(devid), minor(devid)); for (i = 0; i < 25; i++) { int fd = dev_open(buf, flags|O_EXCL); if (fd >= 0) return fd; if (errno == EACCES && flags == O_RDWR) { flags = O_RDONLY; continue; } if (errno != EBUSY) return fd; sleep_for(0, MSEC_TO_NSEC(delay), true); if (delay < 200) delay *= 2; } 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; unsigned int delay = 1; // miliseconds 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; sleep_for(0, MSEC_TO_NSEC(delay), true); if (delay < 200) delay *= 2; } if (i == 25) pr_err("timeout waiting for %s\n", dev); } struct superswitch *superlist[] = { &super0, &super1, &super_ddf, &super_imsm, &mbr, &gpt, NULL }; struct supertype *super_by_fd(int fd, char **subarrayp) { 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; char container[32] = ""; char *devnm = NULL; devnm = fd2devnm(fd); if (!devnm) return NULL; sra = sysfs_read(fd, NULL, GET_VERSION); if (sra) { vers = sra->array.major_version; minor = sra->array.minor_version; verstr = sra->text_version; } else { if (md_get_array_info(fd, &array)) array.major_version = array.minor_version = 0; vers = array.major_version; minor = array.minor_version; verstr = ""; } if (vers != -1) { sprintf(version, "%d.%d", vers, minor); verstr = version; } if (minor == -2 && is_subarray(verstr)) { char *dev = verstr+1; subarray = strchr(dev, '/'); if (subarray) { *subarray++ = '\0'; subarray = xstrdup(subarray); } snprintf(container, sizeof(container), "%s", dev); sysfs_free(sra); sra = sysfs_read(-1, container, 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); sysfs_free(sra); if (st) { st->sb = NULL; if (subarrayp) *subarrayp = subarray; strcpy(st->container_devnm, container); strncpy(st->devnm, devnm, MD_NAME_MAX - 1); } else free(subarray); return st; } struct supertype *dup_super(struct supertype *orig) { struct supertype *st; if (!orig) return orig; st = xcalloc(1, sizeof(*st)); st->ss = orig->ss; st->max_devs = orig->max_devs; st->minor_version = orig->minor_version; st->ignore_hw_compat = orig->ignore_hw_compat; st->data_offset = orig->data_offset; st->sb = NULL; st->info = NULL; return st; } struct supertype *guess_super_type(int fd, enum guess_types guess_type) { /* try each load_super to find the best match, * and return the best superswitch */ struct superswitch *ss; struct supertype *st; unsigned int besttime = 0; int bestsuper = -1; int i; st = xcalloc(1, sizeof(*st)); st->container_devnm[0] = 0; for (i = 0; superlist[i]; i++) { int rv; ss = superlist[i]; if (guess_type == guess_array && ss->add_to_super == NULL) continue; if (guess_type == guess_partitions && ss->add_to_super != NULL) continue; memset(st, 0, sizeof(*st)); st->ignore_hw_compat = 1; rv = ss->load_super(st, fd, NULL); if (rv == 0) { struct mdinfo info; st->ss->getinfo_super(st, &info, NULL); if (bestsuper == -1 || besttime < info.array.ctime) { bestsuper = i; besttime = info.array.ctime; } ss->free_super(st); } } if (bestsuper != -1) { int rv; memset(st, 0, sizeof(*st)); st->ignore_hw_compat = 1; rv = superlist[bestsuper]->load_super(st, fd, NULL); if (rv == 0) { superlist[bestsuper]->free_super(st); return st; } } free(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) pr_err("Cannot get size of %s: %s\n", dname, strerror(errno)); return 0; } } *sizep = ldsize; return 1; } /* Return sector size of device in bytes */ int get_dev_sector_size(int fd, char *dname, unsigned int *sectsizep) { unsigned int sectsize; if (ioctl(fd, BLKSSZGET, §size) != 0) { if (dname) pr_err("Cannot get sector size of %s: %s\n", dname, strerror(errno)); return 0; } *sectsizep = sectsize; return 1; } /* Return true if this can only be a container, not a member device. * i.e. is and md device and size is zero */ int must_be_container(int fd) { struct mdinfo *mdi; unsigned long long size; mdi = sysfs_read(fd, NULL, GET_VERSION); if (!mdi) return 0; sysfs_free(mdi); if (get_dev_size(fd, NULL, &size) == 0) return 1; if (size == 0) return 1; return 0; } /* Sets endofpart parameter to the last block used by the last GPT partition on the device. * Returns: 1 if successful * -1 for unknown partition type * 0 for other errors */ static int get_gpt_last_partition_end(int fd, unsigned long long *endofpart) { struct GPT gpt; unsigned char empty_gpt_entry[16]= {0}; struct GPT_part_entry *part; char buf[512]; unsigned long long curr_part_end; unsigned all_partitions, entry_size; unsigned part_nr; unsigned int sector_size = 0; *endofpart = 0; BUILD_BUG_ON(sizeof(gpt) != 512); /* skip protective MBR */ if (!get_dev_sector_size(fd, NULL, §or_size)) return 0; if (lseek(fd, sector_size, SEEK_SET) == -1L) return 0; /* read GPT header */ if (read(fd, &gpt, 512) != 512) return 0; /* get the number of partition entries and the entry size */ all_partitions = __le32_to_cpu(gpt.part_cnt); entry_size = __le32_to_cpu(gpt.part_size); /* Check GPT signature*/ if (gpt.magic != GPT_SIGNATURE_MAGIC) return -1; /* sanity checks */ if (all_partitions > 1024 || entry_size > sizeof(buf)) return -1; part = (struct GPT_part_entry *)buf; /* set offset to third block (GPT entries) */ if (lseek(fd, sector_size*2, SEEK_SET) == -1L) return 0; for (part_nr = 0; part_nr < all_partitions; part_nr++) { /* read partition entry */ if (read(fd, buf, entry_size) != (ssize_t)entry_size) return 0; /* is this valid partition? */ if (memcmp(part->type_guid, empty_gpt_entry, 16) != 0) { /* check the last lba for the current partition */ curr_part_end = __le64_to_cpu(part->ending_lba); if (curr_part_end > *endofpart) *endofpart = curr_part_end; } } return 1; } /* Sets endofpart parameter to the last block used by the last partition on the device. * Returns: 1 if successful * -1 for unknown partition type * 0 for other errors */ static int get_last_partition_end(int fd, unsigned long long *endofpart) { struct MBR boot_sect; unsigned long long curr_part_end; unsigned part_nr; unsigned int sector_size; int retval = 0; *endofpart = 0; BUILD_BUG_ON(sizeof(boot_sect) != 512); /* read MBR */ if (lseek(fd, 0, 0) == -1L) goto abort; if (read(fd, &boot_sect, 512) != 512) goto abort; /* check MBP signature */ if (boot_sect.magic == MBR_SIGNATURE_MAGIC) { retval = 1; /* found the correct signature */ for (part_nr = 0; part_nr < MBR_PARTITIONS; part_nr++) { /* * Have to make every access through boot_sect rather * than using a pointer to the partition table (or an * entry), since the entries are not properly aligned. */ /* check for GPT type */ if (boot_sect.parts[part_nr].part_type == MBR_GPT_PARTITION_TYPE) { retval = get_gpt_last_partition_end(fd, endofpart); break; } /* check the last used lba for the current partition */ curr_part_end = __le32_to_cpu(boot_sect.parts[part_nr].first_sect_lba) + __le32_to_cpu(boot_sect.parts[part_nr].blocks_num); if (curr_part_end > *endofpart) *endofpart = curr_part_end; } } else { /* Unknown partition table */ retval = -1; } /* calculate number of 512-byte blocks */ if (get_dev_sector_size(fd, NULL, §or_size)) *endofpart *= (sector_size / 512); abort: return retval; } int check_partitions(int fd, char *dname, unsigned long long freesize, unsigned long long size) { /* * Check where the last partition ends */ unsigned long long endofpart; if (get_last_partition_end(fd, &endofpart) > 0) { /* There appears to be a partition table here */ if (freesize == 0) { /* partitions will not be visible in new device */ pr_err("partition table exists on %s but will be lost or\n" " meaningless after creating array\n", dname); return 1; } else if (endofpart > freesize) { /* last partition overlaps metadata */ pr_err("metadata will over-write last partition on %s.\n", dname); return 1; } else if (size && endofpart > size) { /* partitions will be truncated in new device */ pr_err("array size is too small to cover all partitions on %s.\n", dname); return 1; } } return 0; } 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[288]; 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; /* Need to make sure it is a container and not a volume */ sprintf(e, "/%s/md/metadata_version", de->d_name); dfd = open(path, O_RDONLY); if (dfd < 0) continue; n = read(dfd, buf, sizeof(buf)); close(dfd); if (n <= 0 || (unsigned)n >= sizeof(buf)) continue; buf[n] = 0; if (strncmp(buf, "external", 8) != 0 || n < 10 || buf[9] == '/') 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 || (unsigned)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; } struct superswitch *version_to_superswitch(char *vers) { int i; for (i = 0; superlist[i]; i++) { struct superswitch *ss = superlist[i]; if (strcmp(vers, ss->name) == 0) return ss; } return NULL; } int metadata_container_matches(char *metadata, char *devnm) { /* Check if 'devnm' is the container named in 'metadata' * which is * /containername/componentname or * -containername/componentname */ int l; if (*metadata != '/' && *metadata != '-') return 0; l = strlen(devnm); if (strncmp(metadata+1, devnm, l) != 0) return 0; if (metadata[l+1] != '/') return 0; return 1; } int metadata_subdev_matches(char *metadata, char *devnm) { /* Check if 'devnm' is the subdev named in 'metadata' * which is * /containername/subdev or * -containername/subdev */ char *sl; if (*metadata != '/' && *metadata != '-') return 0; sl = strchr(metadata+1, '/'); if (!sl) return 0; if (strcmp(sl+1, devnm) == 0) return 1; return 0; } int is_subarray_active(char *subarray, char *container) { struct mdstat_ent *mdstat = mdstat_read(0, 0); struct mdstat_ent *ent; for (ent = mdstat; ent; ent = ent->next) if (is_container_member(ent, container)) if (strcmp(to_subarray(ent, container), subarray) == 0) break; free_mdstat(mdstat); return ent != NULL; } /* open_subarray - opens a subarray in a container * @dev: container device name * @st: empty supertype * @quiet: block reporting errors flag * * On success returns an fd to a container and fills in *st */ int open_subarray(char *dev, char *subarray, struct supertype *st, int quiet) { struct mdinfo *mdi; struct mdinfo *info; int fd, err = 1; char *_devnm; fd = open(dev, O_RDWR|O_EXCL); if (fd < 0) { if (!quiet) pr_err("Couldn't open %s, aborting\n", dev); return -1; } _devnm = fd2devnm(fd); if (_devnm == NULL) { if (!quiet) pr_err("Failed to determine device number for %s\n", dev); goto close_fd; } snprintf(st->devnm, sizeof(st->devnm), "%s", _devnm); mdi = sysfs_read(fd, st->devnm, GET_VERSION|GET_LEVEL); if (!mdi) { if (!quiet) pr_err("Failed to read sysfs for %s\n", dev); goto close_fd; } if (mdi->array.level != UnSet) { if (!quiet) pr_err("%s is not a container\n", dev); goto free_sysfs; } st->ss = version_to_superswitch(mdi->text_version); if (!st->ss) { if (!quiet) pr_err("Operation not supported for %s metadata\n", mdi->text_version); goto free_sysfs; } if (st->devnm[0] == 0) { if (!quiet) pr_err("Failed to allocate device name\n"); goto free_sysfs; } if (!st->ss->load_container) { if (!quiet) pr_err("%s is not a container\n", dev); goto free_sysfs; } if (st->ss->load_container(st, fd, NULL)) { if (!quiet) pr_err("Failed to load metadata for %s\n", dev); goto free_sysfs; } info = st->ss->container_content(st, subarray); if (!info) { if (!quiet) pr_err("Failed to find subarray-%s in %s\n", subarray, dev); goto free_super; } free(info); err = 0; free_super: if (err) st->ss->free_super(st); free_sysfs: sysfs_free(mdi); close_fd: if (err) close(fd); if (err) return -1; else return fd; } 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; if (st->ss->external) { if (info->disk.state & (1<recovery_start = MaxSector; else info->recovery_start = 0; rv = sysfs_add_disk(sra, info, 0); if (! rv) { struct mdinfo *sd2; for (sd2 = sra->devs; sd2; sd2=sd2->next) if (sd2 == info) break; if (sd2 == NULL) { sd2 = xmalloc(sizeof(*sd2)); *sd2 = *info; sd2->next = sra->devs; sra->devs = sd2; } } } else rv = ioctl(mdfd, ADD_NEW_DISK, &info->disk); return rv; } int remove_disk(int mdfd, struct supertype *st, struct mdinfo *sra, struct mdinfo *info) { int rv; /* Remove the disk given by 'info' from the array */ if (st->ss->external) rv = sysfs_set_str(sra, info, "slot", STR_COMMON_NONE); else rv = ioctl(mdfd, HOT_REMOVE_DISK, makedev(info->disk.major, info->disk.minor)); return rv; } int hot_remove_disk(int mdfd, unsigned long dev, int force) { int cnt = force ? 500 : 5; int ret; /* HOT_REMOVE_DISK can fail with EBUSY if there are * outstanding IO requests to the device. * In this case, it can be helpful to wait a little while, * up to 5 seconds if 'force' is set, or 50 msec if not. */ while ((ret = ioctl(mdfd, HOT_REMOVE_DISK, dev)) == -1 && errno == EBUSY && cnt-- > 0) sleep_for(0, MSEC_TO_NSEC(10), true); return ret; } int sys_hot_remove_disk(int statefd, int force) { int cnt = force ? 500 : 5; int ret; while ((ret = write(statefd, "remove", 6)) == -1 && errno == EBUSY && cnt-- > 0) sleep_for(0, MSEC_TO_NSEC(10), true); return ret == 6 ? 0 : -1; } 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 */ mdu_array_info_t inf; int rv; if (st->ss->external) return sysfs_set_array(info); memset(&inf, 0, sizeof(inf)); inf.major_version = info->array.major_version; inf.minor_version = info->array.minor_version; rv = md_set_array_info(mdfd, &inf); return rv; } unsigned long long min_recovery_start(struct mdinfo *array) { /* find the minimum recovery_start in an array for metadata * formats that only record per-array recovery progress instead * of per-device */ unsigned long long recovery_start = MaxSector; struct mdinfo *d; for (d = array->devs; d; d = d->next) recovery_start = min(recovery_start, d->recovery_start); return recovery_start; } int mdmon_pid(const char *devnm) { char path[100]; char pid[10]; int fd; int n; sprintf(path, "%s/%s.pid", MDMON_DIR, devnm); fd = open(path, O_RDONLY | O_NOATIME, 0); if (fd < 0) return -1; n = read(fd, pid, 9); close(fd); if (n <= 0) return -1; return atoi(pid); } int mdmon_running(const char *devnm) { int pid = mdmon_pid(devnm); if (pid <= 0) return 0; if (kill(pid, 0) == 0) return 1; return 0; } /* * wait_for_mdmon_control_socket() - Waits for mdmon control socket * to be created within specified time. * @container_devnm: Device for which mdmon control socket should start. * * In foreground mode, when mdadm is trying to connect to control * socket it is possible that the mdmon has not created it yet. * Give some time to mdmon to create socket. Timeout set to 2 sec. * * Return: MDADM_STATUS_SUCCESS if connect succeed, otherwise return * error code. */ mdadm_status_t wait_for_mdmon_control_socket(const char *container_devnm) { enum mdadm_status status = MDADM_STATUS_SUCCESS; int sfd, rv, retry_count = 0; struct sockaddr_un addr; char path[PATH_MAX]; snprintf(path, PATH_MAX, "%s/%s.sock", MDMON_DIR, container_devnm); sfd = socket(PF_LOCAL, SOCK_STREAM, 0); if (!is_fd_valid(sfd)) return MDADM_STATUS_ERROR; addr.sun_family = PF_LOCAL; strncpy(addr.sun_path, path, sizeof(addr.sun_path) - 1); addr.sun_path[sizeof(addr.sun_path) - 1] = '\0'; for (retry_count = 0; retry_count < 10; retry_count++) { rv = connect(sfd, (struct sockaddr*)&addr, sizeof(addr)); if (rv < 0) { sleep_for(0, MSEC_TO_NSEC(200), true); continue; } break; } if (rv < 0) { pr_err("Failed to connect to control socket.\n"); status = MDADM_STATUS_ERROR; } close(sfd); return status; } /* * wait_for_mdmon() - Waits for mdmon within specified time. * @devnm: Device for which mdmon should start. * * Function waits for mdmon to start. It may need few seconds * to start, we set timeout to 5, it should be sufficient. * Do not wait if mdmon has been started. * * Return: MDADM_STATUS_SUCCESS if mdmon is running, error code otherwise. */ mdadm_status_t wait_for_mdmon(const char *devnm) { const time_t mdmon_timeout = 5; time_t start_time = time(0); if (mdmon_running(devnm)) return MDADM_STATUS_SUCCESS; pr_info("Waiting for mdmon to start\n"); while (time(0) - start_time < mdmon_timeout) { sleep_for(0, MSEC_TO_NSEC(200), true); if (mdmon_running(devnm)) return MDADM_STATUS_SUCCESS; }; pr_err("Timeout waiting for mdmon\n"); return MDADM_STATUS_ERROR; } int start_mdmon(char *devnm) { int i; int len; pid_t pid; int status; char *prefix = in_initrd() ? "initrd-" : ""; char pathbuf[1024]; char *paths[4] = { pathbuf, BINDIR "/mdmon", "./mdmon", NULL }; if (check_env("MDADM_NO_MDMON")) return 0; if (continue_via_systemd(devnm, MDMON_SERVICE, prefix)) return 0; /* That failed, try running mdmon directly */ len = readlink("/proc/self/exe", pathbuf, sizeof(pathbuf)-1); 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: manage_fork_fds(1); for (i = 0; paths[i]; i++) if (paths[i][0]) { execl(paths[i], paths[i], devnm, NULL); } exit(1); case -1: pr_err("cannot run mdmon. Array remains readonly\n"); return -1; default: /* parent - good */ pid = wait(&status); if (pid < 0 || status != 0) { pr_err("failed to launch mdmon. Array remains readonly\n"); 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; } void random_uuid(__u8 *buf) { int fd, i, len; __u32 r[4]; fd = open("/dev/urandom", O_RDONLY); if (fd < 0) goto use_random; len = read(fd, buf, 16); close(fd); if (len != 16) goto use_random; return; use_random: for (i = 0; i < 4; i++) r[i] = random(); memcpy(buf, r, 16); } int flush_metadata_updates(struct supertype *st) { int sfd; if (!st->updates) { st->update_tail = NULL; return -1; } sfd = connect_monitor(st->container_devnm); 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 = xmalloc(sizeof(*mu)); mu->buf = buf; mu->len = len; mu->space = NULL; mu->space_list = NULL; mu->next = NULL; *st->update_tail = mu; st->update_tail = &mu->next; } #ifdef __TINYC__ /* tinyc doesn't optimize this check in ioctl.h out ... */ unsigned int __invalid_size_argument_for_IOC = 0; #endif /** * disk_fd_matches_criteria() - check if device matches spare criteria. * @st: supertype, not NULL. * @disk_fd: file descriptor of the disk. * @sc: criteria to test. * * Return: true if disk matches criteria, false otherwise. */ bool disk_fd_matches_criteria(struct supertype *st, int disk_fd, struct spare_criteria *sc) { unsigned int dev_sector_size = 0; unsigned long long dev_size = 0; if (!sc->criteria_set) return true; if (!get_dev_size(disk_fd, NULL, &dev_size) || dev_size < sc->min_size) return false; if (!get_dev_sector_size(disk_fd, NULL, &dev_sector_size) || sc->sector_size != dev_sector_size) return false; if (drive_test_and_add_policies(st, &sc->pols, disk_fd, 0)) return false; return true; } /** * devid_matches_criteria() - check if device referenced by devid matches spare criteria. * @st: supertype, not NULL. * @devid: devid of the device to check. * @sc: criteria to test. * * Return: true if disk matches criteria, false otherwise. */ bool devid_matches_criteria(struct supertype *st, dev_t devid, struct spare_criteria *sc) { char buf[NAME_MAX]; bool ret; int fd; if (!sc->criteria_set) return true; snprintf(buf, NAME_MAX, "%d:%d", major(devid), minor(devid)); fd = dev_open(buf, O_RDONLY); if (!is_fd_valid(fd)) return false; /* Error code inherited */ ret = disk_fd_matches_criteria(st, fd, sc); close(fd); return ret; } /* Pick all spares matching given criteria from a container * if min_size == 0 do not check size * if domlist == NULL do not check domains * if spare_group given add it to domains of each spare * metadata allows to test domains using metadata of destination array */ struct mdinfo *container_choose_spares(struct supertype *st, struct spare_criteria *criteria, struct domainlist *domlist, char *spare_group, const char *metadata, int get_one) { struct mdinfo *d, **dp, *disks = NULL; /* get list of all disks in container */ if (st->ss->getinfo_super_disks) disks = st->ss->getinfo_super_disks(st); if (!disks) return disks; /* find spare devices on the list */ dp = &disks->devs; disks->array.spare_disks = 0; while (*dp) { bool found = false; d = *dp; if (d->disk.state == 0) { dev_t dev = makedev(d->disk.major,d->disk.minor); found = devid_matches_criteria(st, dev, criteria); /* check if domain matches */ if (found && domlist) { struct dev_policy *pol = devid_policy(dev); if (spare_group) pol_add(&pol, pol_domain, spare_group, NULL); if (domain_test(domlist, pol, metadata) != 1) found = false; dev_policy_free(pol); } } if (found) { dp = &d->next; disks->array.spare_disks++; if (get_one) { sysfs_free(*dp); d->next = NULL; } } else { *dp = d->next; d->next = NULL; sysfs_free(d); } } return disks; } /* Checks if paths point to the same device * Returns 0 if they do. * Returns 1 if they don't. * Returns -1 if something went wrong, * e.g. paths are empty or the files * they point to don't exist */ int compare_paths (char* path1, char* path2) { struct stat st1,st2; if (path1 == NULL || path2 == NULL) return -1; if (stat(path1,&st1) != 0) return -1; if (stat(path2,&st2) != 0) return -1; if ((st1.st_ino == st2.st_ino) && (st1.st_dev == st2.st_dev)) return 0; return 1; } /* Make sure we can open as many devices as needed */ void enable_fds(int devices) { unsigned int fds = 20 + devices; struct rlimit lim; if (getrlimit(RLIMIT_NOFILE, &lim) != 0 || lim.rlim_cur >= fds) return; if (lim.rlim_max < fds) lim.rlim_max = fds; lim.rlim_cur = fds; setrlimit(RLIMIT_NOFILE, &lim); } /* Close all opened descriptors if needed and redirect * streams to /dev/null. * For debug purposed, leave STDOUT and STDERR untouched * Returns: * 1- if any error occurred * 0- otherwise */ void manage_fork_fds(int close_all) { DIR *dir; struct dirent *dirent; int fd = open("/dev/null", O_RDWR); if (is_fd_valid(fd)) { dup2(fd, 0); #ifndef DEBUG dup2(0, 1); dup2(0, 2); close_fd(&fd); #endif } if (close_all == 0) return; dir = opendir("/proc/self/fd"); if (!dir) { pr_err("Cannot open /proc/self/fd directory.\n"); return; } for (dirent = readdir(dir); dirent; dirent = readdir(dir)) { int fd = -1; if ((strcmp(dirent->d_name, ".") == 0) || (strcmp(dirent->d_name, "..")) == 0) continue; fd = strtol(dirent->d_name, NULL, 10); if (fd > 2) close_fd(&fd); } closedir(dir); return; } /* In a systemd/udev world, it is best to get systemd to * run daemon rather than running in the background. * Returns: * 1- if systemd service has been started * 0- otherwise */ int continue_via_systemd(char *devnm, char *service_name, char *prefix) { int pid, status; char pathbuf[1024]; /* Simply return that service cannot be started */ if (check_env("MDADM_NO_SYSTEMCTL")) return 0; switch (fork()) { case 0: manage_fork_fds(1); snprintf(pathbuf, sizeof(pathbuf), "%s@%s%s.service", service_name, prefix ?: "", devnm); status = execl("/usr/bin/systemctl", "systemctl", "restart", pathbuf, NULL); status = execl("/bin/systemctl", "systemctl", "restart", pathbuf, NULL); exit(1); case -1: /* Just do it ourselves. */ break; default: /* parent - good */ pid = wait(&status); if (pid >= 0 && status == 0) return 1; } return 0; } int in_initrd(void) { return access("/etc/initrd-release", F_OK) >= 0; } void reopen_mddev(int mdfd) { /* Re-open without any O_EXCL, but keep * the same fd */ char *devnm = fd2devnm(mdfd); int fd = open_dev(devnm); if (!is_fd_valid(fd)) return; dup2(fd, mdfd); close_fd(&fd); } static struct cmap_hooks *cmap_hooks = NULL; static int is_cmap_hooks_ready = 0; void set_cmap_hooks(void) { cmap_hooks = xmalloc(sizeof(struct cmap_hooks)); cmap_hooks->cmap_handle = dlopen("libcmap.so.4", RTLD_NOW | RTLD_LOCAL); if (!cmap_hooks->cmap_handle) return; cmap_hooks->initialize = dlsym(cmap_hooks->cmap_handle, "cmap_initialize"); cmap_hooks->get_string = dlsym(cmap_hooks->cmap_handle, "cmap_get_string"); cmap_hooks->finalize = dlsym(cmap_hooks->cmap_handle, "cmap_finalize"); if (!cmap_hooks->initialize || !cmap_hooks->get_string || !cmap_hooks->finalize) dlclose(cmap_hooks->cmap_handle); else is_cmap_hooks_ready = 1; } int get_cluster_name(char **cluster_name) { int rv = -1; cmap_handle_t handle; if (!is_cmap_hooks_ready) return rv; rv = cmap_hooks->initialize(&handle); if (rv != CS_OK) goto out; rv = cmap_hooks->get_string(handle, "totem.cluster_name", cluster_name); if (rv != CS_OK) { free(*cluster_name); rv = -1; goto name_err; } rv = 0; name_err: cmap_hooks->finalize(handle); out: return rv; } void set_dlm_hooks(void) { dlm_hooks = xmalloc(sizeof(struct dlm_hooks)); dlm_hooks->dlm_handle = dlopen("libdlm_lt.so.3", RTLD_NOW | RTLD_LOCAL); if (!dlm_hooks->dlm_handle) return; dlm_hooks->open_lockspace = dlsym(dlm_hooks->dlm_handle, "dlm_open_lockspace"); dlm_hooks->create_lockspace = dlsym(dlm_hooks->dlm_handle, "dlm_create_lockspace"); dlm_hooks->release_lockspace = dlsym(dlm_hooks->dlm_handle, "dlm_release_lockspace"); dlm_hooks->ls_lock = dlsym(dlm_hooks->dlm_handle, "dlm_ls_lock"); dlm_hooks->ls_unlock_wait = dlsym(dlm_hooks->dlm_handle, "dlm_ls_unlock_wait"); dlm_hooks->ls_get_fd = dlsym(dlm_hooks->dlm_handle, "dlm_ls_get_fd"); dlm_hooks->dispatch = dlsym(dlm_hooks->dlm_handle, "dlm_dispatch"); if (!dlm_hooks->open_lockspace || !dlm_hooks->create_lockspace || !dlm_hooks->ls_lock || !dlm_hooks->ls_unlock_wait || !dlm_hooks->release_lockspace || !dlm_hooks->ls_get_fd || !dlm_hooks->dispatch) dlclose(dlm_hooks->dlm_handle); else is_dlm_hooks_ready = 1; } void set_hooks(void) { set_dlm_hooks(); set_cmap_hooks(); } int zero_disk_range(int fd, unsigned long long sector, size_t count) { int ret = 0; int fd_zero; void *addr = NULL; size_t written = 0; size_t len = count * 512; ssize_t n; fd_zero = open("/dev/zero", O_RDONLY); if (fd_zero < 0) { pr_err("Cannot open /dev/zero\n"); return -1; } if (lseek64(fd, sector * 512, SEEK_SET) < 0) { ret = -errno; pr_err("Failed to seek offset for zeroing\n"); goto out; } addr = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd_zero, 0); if (addr == MAP_FAILED) { ret = -errno; pr_err("Mapping /dev/zero failed\n"); goto out; } do { n = write(fd, addr + written, len - written); if (n < 0) { if (errno == EINTR) continue; ret = -errno; pr_err("Zeroing disk range failed\n"); break; } written += n; } while (written != len); munmap(addr, len); out: close(fd_zero); return ret; } /** * sleep_for() - Sleeps for specified time. * @sec: Seconds to sleep for. * @nsec: Nanoseconds to sleep for, has to be less than one second. * @wake_after_interrupt: If set, wake up if interrupted. * * Function immediately returns if error different than EINTR occurs. */ void sleep_for(unsigned int sec, long nsec, bool wake_after_interrupt) { struct timespec delay = {.tv_sec = sec, .tv_nsec = nsec}; assert(nsec < MSEC_TO_NSEC(1000)); do { errno = 0; nanosleep(&delay, &delay); if (errno != 0 && errno != EINTR) { pr_err("Error sleeping for %us %ldns: %s\n", sec, nsec, strerror(errno)); return; } } while (!wake_after_interrupt && errno == EINTR); } /* is_directory() - Checks if directory provided by path is indeed a regular directory. * @path: directory path to be checked * * Doesn't accept symlinks. * * Return: true if is a directory, false if not */ bool is_directory(const char *path) { struct stat st; if (lstat(path, &st) != 0) { pr_err("%s: %s\n", strerror(errno), path); return false; } if (!S_ISDIR(st.st_mode)) return false; return true; } /* * is_file() - Checks if file provided by path is indeed a regular file. * @path: file path to be checked * * Doesn't accept symlinks. * * Return: true if is a file, false if not */ bool is_file(const char *path) { struct stat st; if (lstat(path, &st) != 0) { pr_err("%s: %s\n", strerror(errno), path); return false; } if (!S_ISREG(st.st_mode)) return false; return true; }