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Stop trying to zero UFS1 superblocks if we fall off the end of the disk.

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This avoids a potentially many-hours-long loop of failed writes if newfs
finds a partially-overwritten superblock (or, for that matter, random
garbage which happens to have superblock magic bytes); on one occasion I
found newfs trying to zero 800 million superblocks on a 50 MB disk.

Reviewed by:	mckusick
MFC after:	1 week
This commit is contained in:
Colin Percival 2011-04-26 02:06:31 +00:00
parent 6bb544780b
commit c2805605f7
1 changed files with 4 additions and 1 deletions
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5
sbin/newfs/mkfs.c
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@ -516,9 +516,12 @@ mkfs(struct partition *pp, char *fsys)
fsdummy.fs_magic = 0;
bwrite(&disk, part_ofs + SBLOCK_UFS1 / disk.d_bsize,
chdummy, SBLOCKSIZE);
for (cg = 0; cg < fsdummy.fs_ncg; cg++)
for (cg = 0; cg < fsdummy.fs_ncg; cg++) {
if (fsbtodb(&fsdummy, cgsblock(&fsdummy, cg)) > fssize)
break;
bwrite(&disk, part_ofs + fsbtodb(&fsdummy,
cgsblock(&fsdummy, cg)), chdummy, SBLOCKSIZE);
}
}
}
if (!Nflag)