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migrate_superblock: make sure we remove old superblock

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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2025-03-26 09:39:59 -04:00
parent 2160e9a7bd
commit 7c66e9fac5
1 changed files with 5 additions and 0 deletions

5
c_src/cmd_migrate.c
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@ -419,6 +419,11 @@ int cmd_migrate_superblock(int argc, char *argv[])
sb->layout.sb_offset[0] = cpu_to_le64(BCH_SB_SECTOR);
sb->layout.sb_offset[1] = cpu_to_le64(BCH_SB_SECTOR + sb_size);
/* also write first 0-3.5k bytes with zeroes, ensure we blow away old
* superblock */
static const char zeroes[BCH_SB_SECTOR << 9];
xpwrite(fd, zeroes, BCH_SB_SECTOR << 9, 0, "zeroing start of disk");
bch2_super_write(fd, sb);
close(fd);