/*
* mdadm - manage Linux "md" devices aka RAID arrays.
*
- * Copyright (C) 2001-2006 Neil Brown <neilb@suse.de>
+ * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de>
*
*
* This program is free software; you can redistribute it and/or modify
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Neil Brown
- * Email: <neilb@cse.unsw.edu.au>
- * Paper: Neil Brown
- * School of Computer Science and Engineering
- * The University of New South Wales
- * Sydney, 2052
- * Australia
+ * Email: <neilb@suse.de>
*/
#include "mdadm.h"
char volname[BLKPG_VOLNAMELTH]; /* volume label */
};
+/* partition table structures so we can check metadata position
+ * against the end of the last partition.
+ * Only handle MBR ant GPT partition tables.
+ */
+struct MBR_part_record {
+ __u8 bootable;
+ __u8 first_head;
+ __u8 first_sector;
+ __u8 first_cyl;
+ __u8 part_type;
+ __u8 last_head;
+ __u8 last_sector;
+ __u8 last_cyl;
+ __u32 first_sect_lba;
+ __u32 blocks_num;
+};
+
+struct MBR {
+ __u8 pad[446];
+ struct MBR_part_record parts[4];
+ __u16 magic;
+} __attribute__((packed));
+
+struct GPT_part_entry {
+ unsigned char type_guid[16];
+ unsigned char partition_guid[16];
+ __u64 starting_lba;
+ __u64 ending_lba;
+ unsigned char attr_bits[8];
+ unsigned char name[72];
+} __attribute__((packed));
+
+struct GPT {
+ __u64 magic;
+ __u32 revision;
+ __u32 header_size;
+ __u32 crc;
+ __u32 pad1;
+ __u64 current_lba;
+ __u64 backup_lba;
+ __u64 first_lba;
+ __u64 last_lba;
+ __u8 guid[16];
+ __u64 part_start;
+ __u32 part_cnt;
+ __u32 part_size;
+ __u32 part_crc;
+ __u8 pad2[420];
+} __attribute__((packed));
+
+/* 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); }))
+
+
+/* MBR/GPT magic numbers */
+#define MBR_SIGNATURE_MAGIC __cpu_to_le16(0xAA55)
+#define GPT_SIGNATURE_MAGIC __cpu_to_le64(0x5452415020494645ULL)
+
+#define MBR_PARTITIONS 4
+#define MBR_GPT_PARTITION_TYPE 0xEE
+
/*
* Parse a 128 bit uuid in 4 integers
* format is 32 hexx nibbles with options :.<space> separator
return (a*1000000)+(b*1000)+c;
}
+#ifndef MDASSEMBLE
+long long parse_size(char *size)
+{
+ /* parse 'size' which should be a number optionally
+ * followed by 'K', 'M', or 'G'.
+ * Without a suffix, K is assumed.
+ * Number returned is in sectors (half-K)
+ */
+ 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;
+ }
+ }
+ if (*c)
+ s = 0;
+ return s;
+}
+
+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 = strdup(layout);
+ int mode;
+ m[ln] = 0;
+ mode = map_name(faultylayout, m);
+ if (mode == UnSet)
+ return -1;
+
+ return mode | (atoi(layout+ln)<< ModeShift);
+}
+#endif
+
void remove_partitions(int fd)
{
/* remove partitions from this block devices.
} while (first != 0);
return 1;
- case -4:
+ case LEVEL_MULTIPATH:
return avail_disks>= 1;
- case -1:
+ case LEVEL_LINEAR:
case 0:
return avail_disks == raid_disks;
case 1:
memcpy(a, b, 16);
}
-char *fname_from_uuid(struct supertype *st, struct mdinfo *info, char *buf, char sep)
+char *__fname_from_uuid(int id[4], int swap, char *buf, char sep)
{
int i, j;
- int id;
char uuid[16];
char *c = buf;
strcpy(c, "UUID-");
c += strlen(c);
- copy_uuid(uuid, info->uuid, st->ss->swapuuid);
+ copy_uuid(uuid, id, swap);
for (i = 0; i < 4; i++) {
- id = uuid[i];
if (i)
*c++ = sep;
for (j = 3; j >= 0; j--) {
}
}
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
+ return __fname_from_uuid(info->uuid, (st->ss == &super1) ? 1 : st->ss->swapuuid, buf, sep);
}
#ifndef MDASSEMBLE
/*
* Find a block device with the right major/minor number.
* If we find multiple names, choose the shortest.
- * If we find a non-standard name, it is probably there
- * deliberately so prefer it over a standard name.
+ * If we find a name in /dev/md/, we prefer that.
* This applies only to names for MD devices.
*/
char *map_dev(int major, int minor, int create)
{
struct devmap *p;
- char *std = NULL, *nonstd=NULL;
+ char *regular = NULL, *preferred=NULL;
int did_check = 0;
if (major == 0 && minor == 0)
for (p=devlist; p; p=p->next)
if (p->major == major &&
p->minor == minor) {
- if (is_standard(p->name, NULL)) {
- if (std == NULL ||
- strlen(p->name) < strlen(std))
- std = p->name;
+ if (strncmp(p->name, "/dev/md/",8) == 0) {
+ if (preferred == NULL ||
+ strlen(p->name) < strlen(preferred))
+ preferred = p->name;
} else {
- if (nonstd == NULL ||
- strlen(p->name) < strlen(nonstd))
- nonstd = p->name;
+ if (regular == NULL ||
+ strlen(p->name) < strlen(regular))
+ regular = p->name;
}
}
- if (!std && !nonstd && !did_check) {
+ if (!regular && !preferred && !did_check) {
devlist_ready = 0;
goto retry;
}
- if (create && !std && !nonstd) {
+ if (create && !regular && !preferred) {
static char buf[30];
snprintf(buf, sizeof(buf), "%d:%d", major, minor);
- nonstd = buf;
+ regular = buf;
}
- return nonstd ? nonstd : std;
+ return preferred ? preferred : regular;
}
unsigned long calc_csum(void *super, int bytes)
{
int devnum;
for (devnum = 127; devnum != 128;
- devnum = devnum ? devnum-1 : (1<<22)-1) {
+ devnum = devnum ? devnum-1 : (1<<20)-1) {
char *dn;
int _devnum;
return st1.st_rdev == st2.st_rdev;
}
-void wait_for(char *dev)
+void wait_for(char *dev, int fd)
{
int i;
+ struct stat stb_want;
+
+ 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)
+ if (stat(dev, &stb) == 0 &&
+ (stb.st_mode & S_IFMT) == S_IFBLK &&
+ (stb.st_rdev == stb_want.st_rdev))
return;
usleep(200000);
}
+ if (i == 25)
+ dprintf("%s: timeout waiting for %s\n", __func__, dev);
}
struct superswitch *superlist[] = { &super0, &super1, &super_ddf, &super_imsm, NULL };
if (sra)
sysfs_free(sra);
sra = sysfs_read(-1, devnum, GET_VERSION);
- verstr = sra->text_version ? : "-no-metadata-";
+ if (sra && sra->text_version[0])
+ verstr = sra->text_version;
+ else
+ verstr = "-no-metadata-";
}
for (i = 0; st == NULL && superlist[i] ; i++)
return 1;
}
+
+/* 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 buf[512];
+ unsigned char empty_gpt_entry[16]= {0};
+ struct GPT_part_entry *part;
+ unsigned long long curr_part_end;
+ unsigned all_partitions, entry_size;
+ int part_nr;
+
+ *endofpart = 0;
+
+ BUILD_BUG_ON(sizeof(gpt) != 512);
+ /* read GPT header */
+ lseek(fd, 512, SEEK_SET);
+ 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 > 512)
+ return -1;
+
+ /* read first GPT partition entries */
+ if (read(fd, buf, 512) != 512)
+ return 0;
+
+ part = (struct GPT_part_entry*)buf;
+
+ for (part_nr=0; part_nr < all_partitions; part_nr++) {
+ /* 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;
+ }
+
+ part = (struct GPT_part_entry*)((unsigned char*)part + entry_size);
+
+ if ((unsigned char *)part >= buf + 512) {
+ if (read(fd, buf, 512) != 512)
+ return 0;
+ part = (struct GPT_part_entry*)buf;
+ }
+ }
+ 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;
+ struct MBR_part_record *part;
+ unsigned long long curr_part_end;
+ int part_nr;
+ 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 */
+ part = boot_sect.parts;
+
+ for (part_nr=0; part_nr < MBR_PARTITIONS; part_nr++) {
+ /* check for GPT type */
+ if (part->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(part->first_sect_lba) +
+ __le32_to_cpu(part->blocks_num);
+ if (curr_part_end > *endofpart)
+ *endofpart = curr_part_end;
+
+ part++;
+ }
+ } else {
+ /* Unknown partition table */
+ retval = -1;
+ }
+ abort:
+ return retval;
+}
+
+int check_partitions(int fd, char *dname, unsigned long long freesize)
+{
+ /*
+ * Check where the last partition ends
+ */
+ unsigned long long endofpart;
+ int ret;
+
+ if ((ret = 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 */
+ fprintf(stderr,
+ Name ": 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 */
+ fprintf(stderr,
+ Name ": metadata will over-write last partition on %s.\n",
+ dname);
+ return 1;
+ }
+ }
+ return 0;
+}
+
void get_one_disk(int mdfd, mdu_array_info_t *ainf, mdu_disk_info_t *disk)
{
int d;
int rv;
#ifndef MDASSEMBLE
if (st->ss->external) {
- rv = sysfs_add_disk(sra, info);
+ 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)
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;
+}
+
char *devnum2devname(int num)
{
char name[100];
- if (num > 0)
+ if (num >= 0)
sprintf(name, "md%d", num);
else
sprintf(name, "md_d%d", -1-num);
return NoMdDev;
}
-int mdmon_running(int devnum)
+char *pid_dir = VAR_RUN;
+
+int mdmon_pid(int devnum)
{
char path[100];
char pid[10];
int fd;
int n;
- sprintf(path, "/var/run/mdadm/%s.pid", devnum2devname(devnum));
- fd = open(path, O_RDONLY, 0);
+ sprintf(path, "%s/%s.pid", pid_dir, devnum2devname(devnum));
+ fd = open(path, O_RDONLY | O_NOATIME, 0);
if (fd < 0)
- return 0;
+ return -1;
n = read(fd, pid, 9);
close(fd);
if (n <= 0)
- return 0;
- if (kill(atoi(pid), 0) == 0)
- return 1;
- return 0;
+ return -1;
+ return atoi(pid);
}
-int signal_mdmon(int devnum)
+int mdmon_running(int devnum)
{
- char path[100];
- char pid[10];
- int fd;
- int n;
- sprintf(path, "/var/run/mdadm/%s.pid", devnum2devname(devnum));
- fd = open(path, O_RDONLY, 0);
-
- if (fd < 0)
- return 0;
- n = read(fd, pid, 9);
- close(fd);
- if (n <= 0)
+ int pid = mdmon_pid(devnum);
+ if (pid <= 0)
return 0;
- if (kill(atoi(pid), SIGUSR1) == 0)
+ if (kill(pid, 0) == 0)
return 1;
return 0;
}
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;
+}
+
#ifndef MDASSEMBLE
int flush_metadata_updates(struct supertype *st)
{
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