| /* |
| * 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 "mdadm.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); |
| sb->write_behind = __le32_to_cpu(sb->write_behind); |
| } |
| |
| 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| { "Out of date", 2 }, |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; |
| } |
| |
| unsigned long bitmap_sectors(struct bitmap_super_s *bsb) |
| { |
| unsigned long long bits = bitmap_bits(__le64_to_cpu(bsb->sync_size), |
| __le32_to_cpu(bsb->chunksize)); |
| int bits_per_sector = 8*512; |
| return (bits + bits_per_sector - 1) / bits_per_sector; |
| } |
| |
| |
| bitmap_info_t *bitmap_fd_read(int fd, int brief) |
| { |
| /* Note: fd might be open O_DIRECT, so we must be |
| * careful to align reads properly |
| */ |
| unsigned long long total_bits = 0, read_bits = 0, dirty_bits = 0; |
| bitmap_info_t *info; |
| char *buf, *unaligned; |
| int n, skip; |
| |
| unaligned = malloc(8192*2); |
| buf = (char*) ((unsigned long)unaligned | 8191)+1; |
| n = read(fd, buf, 8192); |
| |
| info = malloc(sizeof(*info)); |
| if (info == NULL) { |
| #if __GNUC__ < 3 |
| fprintf(stderr, Name ": failed to allocate %d bytes\n", |
| (int)sizeof(*info)); |
| #else |
| fprintf(stderr, Name ": failed to allocate %zd bytes\n", |
| sizeof(*info)); |
| #endif |
| return NULL; |
| } |
| |
| if (n < sizeof(info->sb)) { |
| fprintf(stderr, Name ": failed to read superblock of bitmap " |
| "file: %s\n", strerror(errno)); |
| free(info); |
| free(unaligned); |
| return NULL; |
| } |
| memcpy(&info->sb, buf, sizeof(info->sb)); |
| skip = sizeof(info->sb); |
| |
| sb_le_to_cpu(&info->sb); /* convert superblock to CPU byte ordering */ |
| |
| if (brief || info->sb.sync_size == 0 || info->sb.chunksize == 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(read_bits < total_bits) { |
| unsigned long long remaining = total_bits - read_bits; |
| |
| if (n == 0) { |
| n = read(fd, buf, 8192); |
| skip = 0; |
| if (n <= 0) |
| break; |
| } |
| if (remaining > (n-skip) * 8) /* we want the full buffer */ |
| remaining = (n-skip) * 8; |
| |
| dirty_bits += count_dirty_bits(buf+skip, remaining); |
| |
| read_bits += remaining; |
| n = 0; |
| } |
| |
| if (read_bits < total_bits) { /* file truncated... */ |
| fprintf(stderr, Name ": WARNING: bitmap file is not large " |
| "enough for array size %llu!\n\n", |
| (unsigned long long)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 **stp) |
| { |
| int fd; |
| bitmap_info_t *info; |
| struct stat stb; |
| struct supertype *st = *stp; |
| |
| if (stat(filename, &stb) < 0) { |
| fprintf(stderr, Name ": failed to find file %s: %s\n", |
| filename, strerror(errno)); |
| return NULL; |
| } |
| if ((S_IFMT & stb.st_mode) == S_IFBLK) { |
| fd = open(filename, O_RDONLY); |
| if (fd < 0) { |
| fprintf(stderr, Name ": failed to open bitmap file %s: %s\n", |
| filename, strerror(errno)); |
| return NULL; |
| } |
| /* 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); |
| } |
| ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */ |
| *stp = st; |
| } else { |
| fd = open(filename, O_RDONLY|O_DIRECT); |
| if (fd < 0) { |
| fprintf(stderr, Name ": failed to open bitmap file %s: %s\n", |
| filename, strerror(errno)); |
| return NULL; |
| } |
| } |
| |
| info = bitmap_fd_read(fd, brief); |
| close(fd); |
| return info; |
| } |
| |
| __u32 swapl(__u32 l) |
| { |
| char *c = (char*)&l; |
| char t= c[0]; |
| c[0] = c[3]; |
| c[3] = t; |
| |
| t = c[1]; |
| c[1] = c[2]; |
| c[2] = t; |
| return l; |
| } |
| 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; |
| char buf[64]; |
| int swap; |
| __u32 uuid32[4]; |
| |
| 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_LO || |
| sb->version > BITMAP_MAJOR_HI) { |
| 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; |
| if (st) |
| swap = st->ss->swapuuid; |
| else |
| #if __BYTE_ORDER == BIG_ENDIAN |
| swap = 0; |
| #else |
| swap = 1; |
| #endif |
| memcpy(uuid32, sb->uuid, 16); |
| if (swap) |
| printf(" UUID : %08x:%08x:%08x:%08x\n", |
| swapl(uuid32[0]), |
| swapl(uuid32[1]), |
| swapl(uuid32[2]), |
| swapl(uuid32[3])); |
| else |
| printf(" UUID : %08x:%08x:%08x:%08x\n", |
| uuid32[0], |
| uuid32[1], |
| uuid32[2], |
| uuid32[3]); |
| |
| printf(" Events : %llu\n", (unsigned long long)sb->events); |
| printf(" Events Cleared : %llu\n", (unsigned long long)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); |
| if (sb->write_behind) |
| sprintf(buf, "Allow write behind, max %d", sb->write_behind); |
| else |
| sprintf(buf, "Normal"); |
| printf(" Write Mode : %s\n", buf); |
| printf(" Sync Size : %llu%s\n", (unsigned long long)sb->sync_size/2, |
| human_size(sb->sync_size * 512)); |
| 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 write_behind, |
| unsigned long long array_size /* sectors */, |
| int major) |
| { |
| /* |
| * 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; |
| } |
| |
| if (chunksize == UnSet) { |
| /* We don't want more than 2^21 chunks, as 2^11 fill up one |
| * 4K page (2 bytes per chunk), and 2^10 address of those |
| * fill up a 4K indexing page. 2^20 might be safer, especially |
| * on 64bit hosts, so use that. |
| */ |
| chunksize = DEFAULT_BITMAP_CHUNK; |
| /* <<20 for 2^20 chunks, >>9 to convert bytes to sectors */ |
| while (array_size > (chunksize << (20-9))) |
| chunksize <<= 1; |
| } |
| |
| memset(&sb, 0, sizeof(sb)); |
| sb.magic = BITMAP_MAGIC; |
| sb.version = major; |
| if (uuid != NULL) |
| memcpy(sb.uuid, uuid, 16); |
| sb.chunksize = chunksize; |
| sb.daemon_sleep = daemon_sleep; |
| sb.write_behind = write_behind; |
| 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; |
| fflush(fp); |
| /* make the file be the right size (well, to the nearest byte) */ |
| if (ftruncate(fileno(fp), filesize)) |
| perror("ftrunace"); |
| out: |
| fclose(fp); |
| if (rv) |
| unlink(filename); /* possibly corrupted, better get rid of it */ |
| return rv; |
| } |
| |
| int bitmap_update_uuid(int fd, int *uuid, int swap) |
| { |
| struct bitmap_super_s bm; |
| if (lseek(fd, 0, 0) != 0) |
| return 1; |
| if (read(fd, &bm, sizeof(bm)) != sizeof(bm)) |
| return 1; |
| if (bm.magic != __cpu_to_le32(BITMAP_MAGIC)) |
| return 1; |
| copy_uuid(bm.uuid, uuid, swap); |
| if (lseek(fd, 0, 0) != 0) |
| return 2; |
| if (write(fd, &bm, sizeof(bm)) != sizeof(bm)) { |
| lseek(fd, 0, 0); |
| return 2; |
| } |
| lseek(fd, 0, 0); |
| return 0; |
| } |