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util.c
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/*
* mdadm - manage Linux "md" devices aka RAID arrays.
*
* Copyright (C) 2001-2013 Neil Brown <[email protected]>
*
*
* 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: <[email protected]>
*/
#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)
{
/* 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);
}
long parse_num(char *num)
{
/* Either return a valid number, or -1 */
char *c;
long rv = strtol(num, &c, 10);
if (rv < 0 || *c || !num[0])
return -1;
else
return rv;
}
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[100];
char *ep;
int fd;
int mjr,mnr;
sprintf(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);