* 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->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)
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[512];
- int n;
+ void *buf;
+ int n, skip;
+
+ if (posix_memalign(&buf, 512, 8192) != 0) {
+ fprintf(stderr, Name ": failed to allocate 8192 bytes\n");
+ return NULL;
+ }
+ n = read(fd, buf, 8192);
info = malloc(sizeof(*info));
if (info == NULL) {
return NULL;
}
- if (read(fd, &info->sb, sizeof(info->sb)) != sizeof(info->sb)) {
+ if (n < sizeof(info->sb)) {
fprintf(stderr, Name ": failed to read superblock of bitmap "
"file: %s\n", strerror(errno));
free(info);
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)
+
+ 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 --
*/
total_bits = bitmap_bits(info->sb.sync_size, info->sb.chunksize);
- while ((n = read(fd, buf, sizeof(buf))) > 0) {
+ while(read_bits < total_bits) {
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);
+ 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;
- if (read_bits >= total_bits) /* we've got what we want */
- break;
+ n = 0;
}
if (read_bits < total_bits) { /* file truncated... */
struct stat stb;
struct supertype *st = *stp;
- fd = open(filename, O_RDONLY);
- if (fd < 0) {
- fprintf(stderr, Name ": failed to open bitmap file %s: %s\n",
- filename, strerror(errno));
+ if (stat(filename, &stb) < 0) {
+ fprintf(stderr, Name ": failed to find file %s: %s\n",
+ filename, strerror(errno));
return NULL;
}
- fstat(fd, &stb);
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, NULL);
+ } 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);
bitmap_info_t *info;
int rv = 1;
char buf[64];
+ int swap;
+ __u32 uuid32[4];
info = bitmap_file_read(filename, brief, &st);
if (!info)
}
rv = 0;
- if (st && st->ss->swapuuid) {
- printf(" UUID : %08x.%08x.%08x.%08x\n",
- swapl(*(__u32 *)(sb->uuid+0)),
- swapl(*(__u32 *)(sb->uuid+4)),
- swapl(*(__u32 *)(sb->uuid+8)),
- swapl(*(__u32 *)(sb->uuid+12)));
- } else {
- printf(" UUID : %08x.%08x.%08x.%08x\n",
- *(__u32 *)(sb->uuid+0),
- *(__u32 *)(sb->uuid+4),
- *(__u32 *)(sb->uuid+8),
- *(__u32 *)(sb->uuid+12));
- }
+ 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));
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;
}
bytes -= sizeof(block);
}
-
+
rv = 0;
+ fflush(fp);
/* make the file be the right size (well, to the nearest byte) */
- ftruncate(fileno(fp), filesize);
+ 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;
+}
projects / thirdparty / mdadm.git / blobdiff