8f23b0b3fa
To quiet diet-libc Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
328 lines
8.6 KiB
C
328 lines
8.6 KiB
C
/*
|
|
* mdadm - manage Linux "md" devices aka RAID arrays.
|
|
*
|
|
* Copyright (C) 2004 Paul Clements, SteelEye Technology, Inc.
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include "mdadm.h"
|
|
#include <asm/byteorder.h>
|
|
|
|
#define min(a,b) (((a) < (b)) ? (a) : (b))
|
|
|
|
inline void sb_le_to_cpu(bitmap_super_t *sb)
|
|
{
|
|
sb->magic = __le32_to_cpu(sb->magic);
|
|
sb->version = __le32_to_cpu(sb->version);
|
|
/* uuid gets no translation */
|
|
sb->events = __le64_to_cpu(sb->events);
|
|
sb->events_cleared = __le64_to_cpu(sb->events_cleared);
|
|
sb->state = __le32_to_cpu(sb->state);
|
|
sb->chunksize = __le32_to_cpu(sb->chunksize);
|
|
sb->daemon_sleep = __le32_to_cpu(sb->daemon_sleep);
|
|
sb->sync_size = __le64_to_cpu(sb->sync_size);
|
|
}
|
|
|
|
inline void sb_cpu_to_le(bitmap_super_t *sb)
|
|
{
|
|
sb_le_to_cpu(sb); /* these are really the same thing */
|
|
}
|
|
|
|
mapping_t bitmap_states[] = {
|
|
{ "OK", 0 },
|
|
{ "Out of date", 2 },
|
|
{ NULL, -1 }
|
|
};
|
|
|
|
const char *bitmap_state(int state_num)
|
|
{
|
|
char *state = map_num(bitmap_states, state_num);
|
|
return state ? state : "Unknown";
|
|
}
|
|
|
|
const char *human_chunksize(unsigned long bytes)
|
|
{
|
|
static char buf[16];
|
|
char *suffixes[] = { "B", "KB", "MB", "GB", "TB", NULL };
|
|
int i = 0;
|
|
|
|
while (bytes >> 10) {
|
|
bytes >>= 10;
|
|
i++;
|
|
}
|
|
|
|
snprintf(buf, sizeof(buf), "%lu %s", bytes, suffixes[i]);
|
|
|
|
return buf;
|
|
}
|
|
|
|
typedef struct bitmap_info_s {
|
|
bitmap_super_t sb;
|
|
unsigned long long total_bits;
|
|
unsigned long long dirty_bits;
|
|
} bitmap_info_t;
|
|
|
|
/* count the dirty bits in the first num_bits of byte */
|
|
inline int count_dirty_bits_byte(char byte, int num_bits)
|
|
{
|
|
int num = 0;
|
|
|
|
switch (num_bits) { /* fall through... */
|
|
case 8: if (byte & 128) num++;
|
|
case 7: if (byte & 64) num++;
|
|
case 6: if (byte & 32) num++;
|
|
case 5: if (byte & 16) num++;
|
|
case 4: if (byte & 8) num++;
|
|
case 3: if (byte & 4) num++;
|
|
case 2: if (byte & 2) num++;
|
|
case 1: if (byte & 1) num++;
|
|
default: break;
|
|
}
|
|
|
|
return num;
|
|
}
|
|
|
|
int count_dirty_bits(char *buf, int num_bits)
|
|
{
|
|
int i, num = 0;
|
|
|
|
for (i=0; i < num_bits / 8; i++)
|
|
num += count_dirty_bits_byte(buf[i], 8);
|
|
|
|
if (num_bits % 8) /* not an even byte boundary */
|
|
num += count_dirty_bits_byte(buf[i], num_bits % 8);
|
|
|
|
return num;
|
|
}
|
|
|
|
/* calculate the size of the bitmap given the array size and bitmap chunksize */
|
|
unsigned long long bitmap_bits(unsigned long long array_size,
|
|
unsigned long chunksize)
|
|
{
|
|
return (array_size * 512 + chunksize - 1) / chunksize;
|
|
}
|
|
|
|
bitmap_info_t *bitmap_fd_read(int fd, int brief)
|
|
{
|
|
unsigned long long total_bits = 0, read_bits = 0, dirty_bits = 0;
|
|
bitmap_info_t *info;
|
|
char buf[512];
|
|
int n;
|
|
|
|
info = malloc(sizeof(*info));
|
|
if (info == NULL) {
|
|
fprintf(stderr, Name ": failed to allocate %d bytes\n",
|
|
sizeof(*info));
|
|
return NULL;
|
|
}
|
|
|
|
if (read(fd, &info->sb, sizeof(info->sb)) != sizeof(info->sb)) {
|
|
fprintf(stderr, Name ": failed to read superblock of bitmap "
|
|
"file: %s\n", strerror(errno));
|
|
free(info);
|
|
return NULL;
|
|
}
|
|
|
|
sb_le_to_cpu(&info->sb); /* convert superblock to CPU byte ordering */
|
|
|
|
if (brief || info->sb.sync_size == 0)
|
|
goto out;
|
|
|
|
/* read the rest of the file counting total bits and dirty bits --
|
|
* we stop when either:
|
|
* 1) we hit EOF, in which case we assume the rest of the bits (if any)
|
|
* are dirty
|
|
* 2) we've read the full bitmap, in which case we ignore any trailing
|
|
* data in the file
|
|
*/
|
|
total_bits = bitmap_bits(info->sb.sync_size, info->sb.chunksize);
|
|
|
|
while ((n = read(fd, buf, sizeof(*buf))) > 0) {
|
|
unsigned long long remaining = total_bits - read_bits;
|
|
|
|
if (remaining > sizeof(*buf) * 8) /* we want the full buffer */
|
|
remaining = sizeof(*buf) * 8;
|
|
if (remaining > n * 8) /* the file is truncated */
|
|
remaining = n * 8;
|
|
dirty_bits += count_dirty_bits(buf, remaining);
|
|
|
|
read_bits += remaining;
|
|
if (read_bits >= total_bits) /* we've got what we want */
|
|
break;
|
|
}
|
|
|
|
if (read_bits < total_bits) { /* file truncated... */
|
|
fprintf(stderr, Name ": WARNING: bitmap file is not large "
|
|
"enough for array size %llu!\n\n", info->sb.sync_size);
|
|
total_bits = read_bits;
|
|
}
|
|
out:
|
|
info->total_bits = total_bits;
|
|
info->dirty_bits = dirty_bits;
|
|
return info;
|
|
}
|
|
|
|
bitmap_info_t *bitmap_file_read(char *filename, int brief, struct supertype *st)
|
|
{
|
|
int fd;
|
|
bitmap_info_t *info;
|
|
struct stat stb;
|
|
|
|
fd = open(filename, O_RDONLY);
|
|
if (fd < 0) {
|
|
fprintf(stderr, Name ": failed to open bitmap file %s: %s\n",
|
|
filename, strerror(errno));
|
|
return NULL;
|
|
}
|
|
fstat(fd, &stb);
|
|
if ((S_IFMT & stb.st_mode) == S_IFBLK) {
|
|
/* block device, so we are probably after an internal bitmap */
|
|
if (!st) st = guess_super(fd);
|
|
if (!st) {
|
|
/* just look at device... */
|
|
lseek(fd, 0, 0);
|
|
} else {
|
|
st->ss->locate_bitmap(st, fd);
|
|
}
|
|
}
|
|
|
|
info = bitmap_fd_read(fd, brief);
|
|
close(fd);
|
|
return info;
|
|
}
|
|
|
|
int ExamineBitmap(char *filename, int brief, struct supertype *st)
|
|
{
|
|
/*
|
|
* Read the bitmap file and display its contents
|
|
*/
|
|
|
|
bitmap_super_t *sb;
|
|
bitmap_info_t *info;
|
|
int rv = 1;
|
|
|
|
info = bitmap_file_read(filename, brief, st);
|
|
if (!info)
|
|
return rv;
|
|
|
|
sb = &info->sb;
|
|
printf(" Filename : %s\n", filename);
|
|
printf(" Magic : %08x\n", sb->magic);
|
|
if (sb->magic != BITMAP_MAGIC) {
|
|
fprintf(stderr, Name ": invalid bitmap magic 0x%x, the bitmap file appears to be corrupted\n", sb->magic);
|
|
}
|
|
printf(" Version : %d\n", sb->version);
|
|
if (sb->version != BITMAP_MAJOR) {
|
|
fprintf(stderr, Name ": unknown bitmap version %d, either the bitmap file is corrupted or you need to upgrade your tools\n", sb->version);
|
|
goto free_info;
|
|
}
|
|
|
|
rv = 0;
|
|
printf(" UUID : %08x.%08x.%08x.%08x\n",
|
|
*(__u32 *)(sb->uuid+0),
|
|
*(__u32 *)(sb->uuid+4),
|
|
*(__u32 *)(sb->uuid+8),
|
|
*(__u32 *)(sb->uuid+12));
|
|
printf(" Events : %llu\n", sb->events);
|
|
printf(" Events Cleared : %llu\n", sb->events_cleared);
|
|
printf(" State : %s\n", bitmap_state(sb->state));
|
|
printf(" Chunksize : %s\n", human_chunksize(sb->chunksize));
|
|
printf(" Daemon : %ds flush period\n", sb->daemon_sleep);
|
|
printf(" Sync Size : %llu%s\n", sb->sync_size,
|
|
human_size(sb->sync_size * 1024));
|
|
if (brief)
|
|
goto free_info;
|
|
printf(" Bitmap : %llu bits (chunks), %llu dirty (%2.1f%%)\n",
|
|
info->total_bits, info->dirty_bits,
|
|
100.0 * info->dirty_bits / (info->total_bits + 1));
|
|
free_info:
|
|
free(info);
|
|
return rv;
|
|
}
|
|
|
|
int CreateBitmap(char *filename, int force, char uuid[16],
|
|
unsigned long chunksize, unsigned long daemon_sleep,
|
|
unsigned long long array_size)
|
|
{
|
|
/*
|
|
* Create a bitmap file with a superblock and (optionally) a full bitmap
|
|
*/
|
|
|
|
FILE *fp;
|
|
int rv = 1;
|
|
char block[512];
|
|
bitmap_super_t sb;
|
|
long long bytes, filesize;
|
|
|
|
if (!force && access(filename, F_OK) == 0) {
|
|
fprintf(stderr, Name ": bitmap file %s already exists, use --force to overwrite\n", filename);
|
|
return rv;
|
|
}
|
|
|
|
fp = fopen(filename, "w");
|
|
if (fp == NULL) {
|
|
fprintf(stderr, Name ": failed to open bitmap file %s: %s\n",
|
|
filename, strerror(errno));
|
|
return rv;
|
|
}
|
|
|
|
memset(&sb, 0, sizeof(sb));
|
|
sb.magic = BITMAP_MAGIC;
|
|
sb.version = BITMAP_MAJOR;
|
|
if (uuid != NULL)
|
|
memcpy(sb.uuid, uuid, 16);
|
|
sb.chunksize = chunksize;
|
|
sb.daemon_sleep = daemon_sleep;
|
|
sb.sync_size = array_size;
|
|
|
|
sb_cpu_to_le(&sb); /* convert to on-disk byte ordering */
|
|
|
|
if (fwrite(&sb, sizeof(sb), 1, fp) != 1) {
|
|
fprintf(stderr, Name ": failed to write superblock to bitmap file %s: %s\n", filename, strerror(errno));
|
|
goto out;
|
|
}
|
|
|
|
/* calculate the size of the bitmap and write it to disk */
|
|
bytes = (bitmap_bits(array_size, chunksize) + 7) / 8;
|
|
if (!bytes) {
|
|
rv = 0;
|
|
goto out;
|
|
}
|
|
|
|
filesize = bytes + sizeof(sb);
|
|
|
|
memset(block, 0xff, sizeof(block));
|
|
|
|
while (bytes > 0) {
|
|
if (fwrite(block, sizeof(block), 1, fp) != 1) {
|
|
fprintf(stderr, Name ": failed to write bitmap file %s: %s\n", filename, strerror(errno));
|
|
goto out;
|
|
}
|
|
bytes -= sizeof(block);
|
|
}
|
|
|
|
rv = 0;
|
|
/* make the file be the right size (well, to the nearest byte) */
|
|
ftruncate(fileno(fp), filesize);
|
|
out:
|
|
fclose(fp);
|
|
if (rv)
|
|
unlink(filename); /* possibly corrupted, better get rid of it */
|
|
return rv;
|
|
}
|