diff options
Diffstat (limited to 'util.c')
| -rw-r--r-- | util.c | 2378 |
1 files changed, 2378 insertions, 0 deletions
@@ -0,0 +1,2378 @@ +/* + * mdadm - manage Linux "md" devices aka RAID arrays. + * + * Copyright (C) 2001-2013 Neil Brown <neilb@suse.de> + * + * + * 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: <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 <sys/resource.h> +#include <sys/vfs.h> +#include <sys/mman.h> +#include <linux/magic.h> +#include <poll.h> +#include <ctype.h> +#include <dirent.h> +#include <signal.h> +#include <dlfcn.h> + + +/* + * 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(10); + 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 = ioctl(fd, GET_ARRAY_INFO, &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) +{ + if (!layout) + return -1; + /* Parse the layout string for 'faulty' */ + int ln = strcspn(layout, "0123456789"); + char *m = xstrdup(layout); + int mode; + m[ln] = 0; + mode = map_name(faultylayout, 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; + + 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; + +} + +char *fname_from_uuid(struct supertype *st, struct mdinfo *info, + char *buf, char sep) +{ + // dirty hack to work around an issue with super1 superblocks... + // super1 superblocks need swapuuid set in order for assembly to + // work, but can't have it set if we want this printout to match + // all the other uuid printouts in super1.c, so we force swapuuid + // to 1 to make our printout match the rest of super1 +#if __BYTE_ORDER == BIG_ENDIAN + return __fname_from_uuid(info->uuid, 1, buf, sep); +#else + return __fname_from_uuid(info->uuid, (st->ss == &super1) ? 1 : + st->ss->swapuuid, buf, sep); +#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_err("%s appears to contain an ext2fs file system\n", + name); + cont_err("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; +} + +int ask(char *mesg) +{ + char *add = ""; + int i; + for (i = 0; i < 5; i++) { + char buf[100]; + fprintf(stderr, "%s%s", mesg, add); + fflush(stderr); + if (fgets(buf, 100, stdin)==NULL) + return 0; + if (buf[0]=='y' || buf[0]=='Y') + return 1; + if (buf[0]=='n' || buf[0]=='N') + return 0; + add = "(y/n) "; + } + pr_err("assuming 'no'\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; +} + +char *get_md_name(char *devnm) +{ + /* 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 = devnm2devid(devnm); + char *dn; + + if (rdev == 0) + return 0; + if (strncmp(devnm, "md_", 3) == 0) { + snprintf(devname, sizeof(devname), "/dev/md/%s", + devnm + 3); + if (stat(devname, &stb) == 0 && + (S_IFMT&stb.st_mode) == S_IFBLK && (stb.st_rdev == rdev)) + return devname; + } + snprintf(devname, sizeof(devname), "/dev/%s", devnm); + if (stat(devname, &stb) == 0 && (S_IFMT&stb.st_mode) == S_IFBLK && + (stb.st_rdev == rdev)) + return devname; + + snprintf(devname, sizeof(devname), "/dev/md/%s", devnm+2); + 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), 0); + if (dn) + return dn; + snprintf(devname, sizeof(devname), "/dev/.tmp.%s", devnm); + 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); +} + +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); +} + +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); + long delay = 1000; + + 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; + usleep(delay); + if (delay < 200000) + 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; + long delay = 1000; + + 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(delay); + if (delay < 200000) + 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] = ""; + + 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); + } + strcpy(container, 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); + strcpy(st->devnm, fd2devnm(fd)); + } else + free(subarray); + + return st; +} + +int dev_size_from_id(dev_t id, unsigned long long *size) +{ + char buf[20]; + int fd; + + sprintf(buf, "%d:%d", major(id), minor(id)); + fd = dev_open(buf, O_RDONLY); + if (fd < 0) + return 0; + if (get_dev_size(fd, NULL, size)) { + close(fd); + return 1; + } + close(fd); + return 0; +} + +int dev_sector_size_from_id(dev_t id, unsigned int *size) +{ + char buf[20]; + int fd; + + sprintf(buf, "%d:%d", major(id), minor(id)); + fd = dev_open(buf, O_RDONLY); + if (fd < 0) + return 0; + if (get_dev_sector_size(fd, NULL, size)) { + close(fd); + return 1; + } + close(fd); + return 0; +} + +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; + lseek(fd, sector_size, SEEK_SET); + /* 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) */ + lseek(fd, sector_size*2, SEEK_SET); + 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 */ + lseek(fd, 0, 0); + 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_container_member(struct mdstat_ent *mdstat, char *container) +{ + if (mdstat->metadata_version == NULL || + strncmp(mdstat->metadata_version, "external:", 9) != 0 || + !metadata_container_matches(mdstat->metadata_version+9, container)) + return 0; + + return 1; +} + +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; + } + strcpy(st->devnm, _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<<MD_DISK_SYNC)) + info->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", "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) + usleep(10000); + + 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) + usleep(10000); + 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, 9003); + + 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(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(char *devnm) +{ + int pid = mdmon_pid(devnm); + if (pid <= 0) + return 0; + if (kill(pid, 0) == 0) + return 1; + return 0; +} + +int start_mdmon(char *devnm) +{ + int i; + int len; + pid_t pid; + int status; + 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)) + 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 + +/* 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) { + int found = 0; + d = *dp; + if (d->disk.state == 0) { + /* check if size is acceptable */ + unsigned long long dev_size; + unsigned int dev_sector_size; + int size_valid = 0; + int sector_size_valid = 0; + + dev_t dev = makedev(d->disk.major,d->disk.minor); + + if (!criteria->min_size || + (dev_size_from_id(dev, &dev_size) && + dev_size >= criteria->min_size)) + size_valid = 1; + + if (!criteria->sector_size || + (dev_sector_size_from_id(dev, &dev_sector_size) && + criteria->sector_size == dev_sector_size)) + sector_size_valid = 1; + + found = size_valid && sector_size_valid; + + /* 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 = 0; + 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; + + close(0); + open("/dev/null", O_RDWR); + +#ifndef DEBUG + dup2(0, 1); + dup2(0, 2); +#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); + } +} + +/* 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) +{ + 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.service", service_name, 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) +{ + /* This is based on similar function in systemd. */ + struct statfs s; + /* statfs.f_type is signed long on s390x and MIPS, causing all + sorts of sign extension problems with RAMFS_MAGIC being + defined as 0x858458f6 */ + return statfs("/", &s) >= 0 && + ((unsigned long)s.f_type == TMPFS_MAGIC || + ((unsigned long)s.f_type & 0xFFFFFFFFUL) == + ((unsigned long)RAMFS_MAGIC & 0xFFFFFFFFUL)); +} + +void reopen_mddev(int mdfd) +{ + /* Re-open without any O_EXCL, but keep + * the same fd + */ + char *devnm; + int fd; + devnm = fd2devnm(mdfd); + close(mdfd); + fd = open_dev(devnm); + if (fd >= 0 && fd != mdfd) + dup2(fd, mdfd); +} + +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; +} |