diff options
Diffstat (limited to 'super-ddf.c')
| -rw-r--r-- | super-ddf.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/super-ddf.c b/super-ddf.c index a78692c3..9192ccdc 100644 --- a/super-ddf.c +++ b/super-ddf.c @@ -1327,6 +1327,68 @@ static void export_examine_super_ddf(struct supertype *st) printf("MD_UUID=%s\n", nbuf+5); } +static int copy_metadata_ddf(struct supertype *st, int from, int to) +{ + void *buf; + unsigned long long dsize, offset; + int bytes; + struct ddf_header *ddf; + int written = 0; + + /* The meta consists of an anchor, a primary, and a secondary. + * This all lives at the end of the device. + * So it is easiest to find the earliest of primary and + * secondary, and copy everything from there. + * + * Anchor is 512 from end It contains primary_lba and secondary_lba + * we choose one of those + */ + + if (posix_memalign(&buf, 4096, 4096) != 0) + return 1; + + if (!get_dev_size(from, NULL, &dsize)) + goto err; + + if (lseek64(from, dsize-512, 0) < 0) + goto err; + if (read(from, buf, 512) != 512) + goto err; + ddf = buf; + if (ddf->magic != DDF_HEADER_MAGIC || + calc_crc(ddf, 512) != ddf->crc || + (memcmp(ddf->revision, DDF_REVISION_0, 8) != 0 && + memcmp(ddf->revision, DDF_REVISION_2, 8) != 0)) + goto err; + + offset = dsize - 512; + if ((__be64_to_cpu(ddf->primary_lba) << 9) < offset) + offset = __be64_to_cpu(ddf->primary_lba) << 9; + if ((__be64_to_cpu(ddf->secondary_lba) << 9) < offset) + offset = __be64_to_cpu(ddf->secondary_lba) << 9; + + bytes = dsize - offset; + + if (lseek64(from, offset, 0) < 0 || + lseek64(to, offset, 0) < 0) + goto err; + while (written < bytes) { + int n = bytes - written; + if (n > 4096) + n = 4096; + if (read(from, buf, n) != n) + goto err; + if (write(to, buf, n) != n) + goto err; + written += n; + } + free(buf); + return 0; +err: + free(buf); + return 1; +} + static void detail_super_ddf(struct supertype *st, char *homehost) { /* FIXME later @@ -4298,6 +4360,7 @@ struct superswitch super_ddf = { .add_to_super = add_to_super_ddf, .remove_from_super = remove_from_super_ddf, .load_container = load_container_ddf, + .copy_metadata = copy_metadata_ddf, #endif .match_home = match_home_ddf, .uuid_from_super= uuid_from_super_ddf, |