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authorDaniel Baumann <daniel.baumann@progress-linux.org>2023-02-24 14:34:34 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2023-02-24 14:34:34 +0000
commit946b54554e13d6a97940df936123855e0a305abc (patch)
tree80a778fbd7bb3c7858cfac572df1cb08cfa4f988 /util.c
parentInitial commit. (diff)
downloadmdadm-946b54554e13d6a97940df936123855e0a305abc.tar.xz
mdadm-946b54554e13d6a97940df936123855e0a305abc.zip
Adding upstream version 4.2.upstream/4.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'util.c')
-rw-r--r--util.c2378
1 files changed, 2378 insertions, 0 deletions
diff --git a/util.c b/util.c
new file mode 100644
index 0000000..3d05d07
--- /dev/null
+++ b/util.c
@@ -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, &sectsize) != 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, &sector_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, &sector_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;
+}