fe6729fa8c
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
618 lines
14 KiB
C
618 lines
14 KiB
C
/*
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* mdadm - manage Linux "md" devices aka RAID arrays.
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*
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* Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Neil Brown
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* Email: <neilb@cse.unsw.edu.au>
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* Paper: Neil Brown
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* School of Computer Science and Engineering
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* The University of New South Wales
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* Sydney, 2052
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* Australia
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*/
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#include "mdadm.h"
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#include "md_p.h"
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#include <sys/utsname.h>
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#include <ctype.h>
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/*
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* Parse a 128 bit uuid in 4 integers
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* format is 32 hexx nibbles with options :.<space> separator
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* If not exactly 32 hex digits are found, return 0
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* else return 1
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*/
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int parse_uuid(char *str, int uuid[4])
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{
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int hit = 0; /* number of Hex digIT */
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int i;
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char c;
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for (i=0; i<4; i++) uuid[i]=0;
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while ((c= *str++)) {
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int n;
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if (c>='0' && c<='9')
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n = c-'0';
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else if (c>='a' && c <= 'f')
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n = 10 + c - 'a';
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else if (c>='A' && c <= 'F')
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n = 10 + c - 'A';
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else if (strchr(":. -", c))
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continue;
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else return 0;
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if (hit<32) {
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uuid[hit/8] <<= 4;
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uuid[hit/8] += n;
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}
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hit++;
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}
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if (hit == 32)
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return 1;
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return 0;
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}
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/*
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* Get the md version number.
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* We use the RAID_VERSION ioctl if it is supported
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* If not, but we have a block device with major '9', we assume
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* 0.36.0
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*
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* Return version number as 24 but number - assume version parts
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* always < 255
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*/
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int md_get_version(int fd)
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{
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struct stat stb;
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mdu_version_t vers;
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if (fstat(fd, &stb)<0)
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return -1;
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if ((S_IFMT&stb.st_mode) != S_IFBLK)
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return -1;
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if (ioctl(fd, RAID_VERSION, &vers) == 0)
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return (vers.major*10000) + (vers.minor*100) + vers.patchlevel;
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if (errno == EACCES)
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return -1;
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if (major(stb.st_rdev) == MD_MAJOR)
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return (3600);
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return -1;
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}
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int get_linux_version()
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{
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struct utsname name;
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char *cp;
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int a,b,c;
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if (uname(&name) <0)
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return -1;
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cp = name.release;
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a = strtoul(cp, &cp, 10);
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if (*cp != '.') return -1;
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b = strtoul(cp+1, &cp, 10);
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if (*cp != '.') return -1;
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c = strtoul(cp+1, NULL, 10);
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return (a*1000000)+(b*1000)+c;
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}
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int enough(int level, int raid_disks, int avail_disks)
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{
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switch (level) {
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case 10: return 1; /* a lie, but it is hard to tell */
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case -4:
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return avail_disks>= 1;
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case -1:
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case 0:
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return avail_disks == raid_disks;
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case 1:
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return avail_disks >= 1;
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case 4:
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case 5:
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return avail_disks >= raid_disks-1;
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case 6:
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return avail_disks >= raid_disks-2;
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default:
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return 0;
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}
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}
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int same_uuid(int a[4], int b[4])
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{
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if (a[0]==b[0] &&
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a[1]==b[1] &&
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a[2]==b[2] &&
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a[3]==b[3])
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return 1;
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return 0;
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}
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int check_ext2(int fd, char *name)
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{
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/*
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* Check for an ext2fs file system.
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* Superblock is always 1K at 1K offset
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*
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* s_magic is le16 at 56 == 0xEF53
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* report mtime - le32 at 44
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* blocks - le32 at 4
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* logblksize - le32 at 24
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*/
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unsigned char sb[1024];
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time_t mtime;
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int size, bsize;
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if (lseek(fd, 1024,0)!= 1024)
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return 0;
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if (read(fd, sb, 1024)!= 1024)
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return 0;
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if (sb[56] != 0x53 || sb[57] != 0xef)
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return 0;
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mtime = sb[44]|(sb[45]|(sb[46]|sb[47]<<8)<<8)<<8;
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bsize = sb[24]|(sb[25]|(sb[26]|sb[27]<<8)<<8)<<8;
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size = sb[4]|(sb[5]|(sb[6]|sb[7]<<8)<<8)<<8;
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fprintf(stderr, Name ": %s appears to contain an ext2fs file system\n",
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name);
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fprintf(stderr," size=%dK mtime=%s",
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size*(1<<bsize), ctime(&mtime));
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return 1;
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}
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int check_reiser(int fd, char *name)
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{
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/*
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* superblock is at 64K
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* size is 1024;
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* Magic string "ReIsErFs" or "ReIsEr2Fs" at 52
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*
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*/
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unsigned char sb[1024];
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int size;
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if (lseek(fd, 64*1024, 0) != 64*1024)
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return 0;
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if (read(fd, sb, 1024) != 1024)
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return 0;
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if (strncmp((char*)sb+52, "ReIsErFs",8)!=0 &&
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strncmp((char*)sb+52, "ReIsEr2Fs",9)!=0)
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return 0;
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fprintf(stderr, Name ": %s appears to contain a reiserfs file system\n",name);
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size = sb[0]|(sb[1]|(sb[2]|sb[3]<<8)<<8)<<8;
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fprintf(stderr, " size = %dK\n", size*4);
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return 1;
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}
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int check_raid(int fd, char *name)
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{
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void *super;
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struct mdinfo info;
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time_t crtime;
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struct supertype *st = guess_super(fd);
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if (!st) return 0;
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st->ss->load_super(st, fd, &super, name);
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/* Looks like a raid array .. */
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fprintf(stderr, Name ": %s appears to be part of a raid array:\n",
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name);
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st->ss->getinfo_super(&info, super);
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free(super);
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crtime = info.array.ctime;
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fprintf(stderr, " level=%d devices=%d ctime=%s",
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info.array.level, info.array.raid_disks, ctime(&crtime));
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return 1;
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}
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int ask(char *mesg)
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{
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char *add = "";
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int i;
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for (i=0; i<5; i++) {
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char buf[100];
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fprintf(stderr, "%s%s", mesg, add);
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fflush(stderr);
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if (fgets(buf, 100, stdin)==NULL)
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return 0;
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if (buf[0]=='y' || buf[0]=='Y')
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return 1;
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if (buf[0]=='n' || buf[0]=='N')
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return 0;
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add = "(y/n) ";
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}
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fprintf(stderr, Name ": assuming 'no'\n");
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return 0;
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}
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char *map_num(mapping_t *map, int num)
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{
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while (map->name) {
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if (map->num == num)
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return map->name;
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map++;
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}
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return NULL;
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}
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int map_name(mapping_t *map, char *name)
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{
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while (map->name) {
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if (strcmp(map->name, name)==0)
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return map->num;
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map++;
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}
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return UnSet;
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}
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int is_standard(char *dev, int *nump)
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{
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/* tests if dev is a "standard" md dev name.
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* i.e if the last component is "/dNN" or "/mdNN",
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* where NN is a string of digits
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*/
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char *d = strrchr(dev, '/');
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int type=0;
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int num;
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if (!d)
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return 0;
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if (strncmp(d, "/d",2)==0)
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d += 2, type=1; /* /dev/md/dN{pM} */
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else if (strncmp(d, "/md_d", 5)==0)
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d += 5, type=1; /* /dev/md_dNpM */
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else if (strncmp(d, "/md", 3)==0)
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d += 3, type=-1; /* /dev/mdN */
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else if (d-dev > 3 && strncmp(d-2, "md/", 3)==0)
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d += 1, type=-1; /* /dev/md/N */
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else
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return 0;
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if (!*d)
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return 0;
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num = atoi(d);
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while (isdigit(*d))
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d++;
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if (*d)
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return 0;
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if (nump) *nump = num;
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return type;
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}
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/*
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* convert a major/minor pair for a block device into a name in /dev, if possible.
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* On the first call, walk /dev collecting name.
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* Put them in a simple linked listfor now.
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*/
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struct devmap {
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int major, minor;
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char *name;
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struct devmap *next;
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} *devlist = NULL;
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int devlist_ready = 0;
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#ifdef UCLIBC
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int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s)
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{
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}
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char *map_dev(int major, int minor)
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{
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#if 0
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fprintf(stderr, "Warning - fail to map %d,%d to a device name\n",
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major, minor);
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#endif
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return NULL;
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}
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#else
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#ifdef __dietlibc__
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int add_dev_1(const char *name, const struct stat *stb, int flag)
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{
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return add_dev(name, stb, flag, NULL);
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}
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int nftw(const char *path, int (*han)(const char *name, const struct stat *stb, int flag, struct FTW *s), int nopenfd, int flags)
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{
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ftw(path, add_dev_1, nopenfd);
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}
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#endif
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int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s)
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{
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if ((stb->st_mode&S_IFMT)== S_IFBLK) {
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char *n = strdup(name);
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struct devmap *dm = malloc(sizeof(*dm));
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if (dm) {
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dm->major = major(stb->st_rdev);
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dm->minor = minor(stb->st_rdev);
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dm->name = n;
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dm->next = devlist;
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devlist = dm;
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}
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}
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return 0;
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}
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/*
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* Find a block device with the right major/minor number.
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* If we find multiple names, choose the shortest.
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* If we find a non-standard name, it is probably there
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* deliberately so prefer it over a standard name.
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* This applies only to names for MD devices.
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*/
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char *map_dev(int major, int minor)
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{
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struct devmap *p;
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char *std = NULL, *nonstd=NULL;
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if (!devlist_ready) {
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nftw("/dev", add_dev, 10, FTW_PHYS);
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devlist_ready=1;
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}
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for (p=devlist; p; p=p->next)
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if (p->major == major &&
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p->minor == minor) {
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if (is_standard(p->name, NULL)) {
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if (std == NULL ||
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strlen(p->name) < strlen(std))
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std = p->name;
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} else {
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if (nonstd == NULL ||
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strlen(p->name) < strlen(nonstd))
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nonstd = p->name;
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}
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}
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return nonstd ? nonstd : std;
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}
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#endif
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unsigned long calc_csum(void *super, int bytes)
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{
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unsigned long long newcsum = 0;
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int i;
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unsigned int csum;
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unsigned int *superc = (unsigned int*) super;
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for(i=0; i<bytes/4; i++)
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newcsum+= superc[i];
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csum = (newcsum& 0xffffffff) + (newcsum>>32);
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#ifdef __alpha__
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/* The in-kernel checksum calculation is always 16bit on
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* the alpha, though it is 32 bit on i386...
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* I wonder what it is elsewhere... (it uses and API in
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* a way that it shouldn't).
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*/
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csum = (csum & 0xffff) + (csum >> 16);
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csum = (csum & 0xffff) + (csum >> 16);
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#endif
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return csum;
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}
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char *human_size(long long bytes)
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{
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static char buf[30];
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/* We convert bytes to either centi-M{ega,ibi}bytes or
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* centi-G{igi,ibi}bytes, with appropriate rounding,
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* and then print 1/100th of those as a decimal.
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* We allow upto 2048Megabytes before converting to
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* gigabytes, as that shows more precision and isn't
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* too large a number.
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* Terrabytes are not yet handled.
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*/
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if (bytes < 5000*1024)
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buf[0]=0;
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else if (bytes < 2*1024LL*1024LL*1024LL) {
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long cMiB = (bytes / ( (1LL<<20) / 200LL ) +1) /2;
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long cMB = (bytes / ( 1000000LL / 200LL ) +1) /2;
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snprintf(buf, sizeof(buf), " (%ld.%02ld MiB %ld.%02ld MB)",
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cMiB/100 , cMiB % 100,
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cMB/100, cMB % 100);
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} else {
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long cGiB = (bytes / ( (1LL<<30) / 200LL ) +1) /2;
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long cGB = (bytes / (1000000000LL/200LL ) +1) /2;
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snprintf(buf, sizeof(buf), " (%ld.%02ld GiB %ld.%02ld GB)",
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cGiB/100 , cGiB % 100,
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cGB/100, cGB % 100);
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}
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return buf;
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}
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char *human_size_brief(long long bytes)
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{
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static char buf[30];
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if (bytes < 5000*1024)
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snprintf(buf, sizeof(buf), "%ld.%02ldKiB",
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(long)(bytes>>10), (long)(((bytes&1023)*100+512)/1024)
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);
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else if (bytes < 2*1024LL*1024LL*1024LL)
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snprintf(buf, sizeof(buf), "%ld.%02ldMiB",
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(long)(bytes>>20),
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(long)((bytes&0xfffff)+0x100000/200)/(0x100000/100)
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);
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else
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snprintf(buf, sizeof(buf), "%ld.%02ldGiB",
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(long)(bytes>>30),
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(long)(((bytes>>10)&0xfffff)+0x100000/200)/(0x100000/100)
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);
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return buf;
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}
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int get_mdp_major(void)
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{
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static int mdp_major = -1;
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FILE *fl;
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char *w;
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int have_block = 0;
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int have_devices = 0;
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int last_num = -1;
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if (mdp_major != -1)
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return mdp_major;
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fl = fopen("/proc/devices", "r");
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if (!fl)
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return -1;
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while ((w = conf_word(fl, 1))) {
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if (have_block && strcmp(w, "devices:")==0)
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have_devices = 1;
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have_block = (strcmp(w, "Block")==0);
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if (isdigit(w[0]))
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last_num = atoi(w);
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if (have_devices && strcmp(w, "mdp")==0)
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mdp_major = last_num;
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free(w);
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}
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fclose(fl);
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return mdp_major;
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}
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char *get_md_name(int dev)
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{
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/* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */
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/* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */
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static char devname[50];
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struct stat stb;
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dev_t rdev;
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char *dn;
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if (dev < 0) {
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int mdp = get_mdp_major();
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if (mdp < 0) return NULL;
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rdev = makedev(mdp, (-1-dev)<<6);
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snprintf(devname, sizeof(devname), "/dev/md/d%d", -1-dev);
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if (stat(devname, &stb) == 0
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&& (S_IFMT&stb.st_mode) == S_IFBLK
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&& (stb.st_rdev == rdev))
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return devname;
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} else {
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rdev = makedev(MD_MAJOR, dev);
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snprintf(devname, sizeof(devname), "/dev/md%d", dev);
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if (stat(devname, &stb) == 0
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&& (S_IFMT&stb.st_mode) == S_IFBLK
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&& (stb.st_rdev == rdev))
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return devname;
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|
|
snprintf(devname, sizeof(devname), "/dev/md/%d", dev);
|
|
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));
|
|
if (dn)
|
|
return dn;
|
|
snprintf(devname, sizeof(devname), "/dev/.tmp.md%d", dev);
|
|
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);
|
|
}
|
|
|
|
|
|
|
|
struct superswitch *superlist[] = { &super0, &super1, NULL };
|
|
|
|
struct supertype *super_by_version(int vers, int minor)
|
|
{
|
|
struct supertype *st = malloc(sizeof(*st));
|
|
if (!st) return st;
|
|
if (vers == 0) {
|
|
st->ss = &super0;
|
|
st->max_devs = MD_SB_DISKS;
|
|
}
|
|
|
|
if (vers == 1) {
|
|
st->ss = &super1;
|
|
st->max_devs = 384;
|
|
}
|
|
st->minor_version = minor;
|
|
return st;
|
|
}
|
|
|
|
struct supertype *guess_super(int fd)
|
|
{
|
|
/* try each load_super to find the best match,
|
|
* and return the best superswitch
|
|
*/
|
|
struct superswitch *ss;
|
|
struct supertype *st;
|
|
unsigned long besttime = 0;
|
|
int bestsuper = -1;
|
|
|
|
void *sbp = NULL;
|
|
int i;
|
|
|
|
st = malloc(sizeof(*st));
|
|
memset(st, 0, sizeof(*st));
|
|
for (i=0 ; superlist[i]; i++) {
|
|
int rv;
|
|
ss = superlist[i];
|
|
rv = ss->load_super(st, fd, &sbp, NULL);
|
|
if (rv == 0) {
|
|
struct mdinfo info;
|
|
ss->getinfo_super(&info, sbp);
|
|
if (bestsuper == -1 ||
|
|
besttime < info.array.ctime) {
|
|
bestsuper = i;
|
|
besttime = info.array.ctime;
|
|
}
|
|
st->ss = NULL;
|
|
free(sbp);
|
|
}
|
|
}
|
|
if (bestsuper != -1) {
|
|
int rv;
|
|
rv = superlist[bestsuper]->load_super(st, fd, &sbp, NULL);
|
|
if (rv == 0) {
|
|
free(sbp);
|
|
return st;
|
|
}
|
|
}
|
|
free(st);
|
|
return NULL;
|
|
}
|
|
|
|
#ifdef __TINYC__
|
|
/* tinyc doesn't optimize this check in ioctl.h out ... */
|
|
unsigned int __invalid_size_argument_for_IOC = 0;
|
|
#endif
|
|
|