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When we end up with too few clusters for the requested FAT type after 

configuring default values, retry with a smaller cluster size.
This makes the typical invocation to create a spec conformant EFI boot
partition work out of the box.
This commit is contained in:
martin 2019-10-12 09:42:38 +00:00
parent a11c5ab81a
commit 410b25665f
1 changed files with 11 additions and 2 deletions
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13
sbin/newfs_msdos/mkfs_msdos.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: mkfs_msdos.c,v 1.14 2018/02/04 09:03:23 mrg Exp $ */
/* $NetBSD: mkfs_msdos.c,v 1.15 2019/10/12 09:42:38 martin Exp $ */
/*
* Copyright (c) 1998 Robert Nordier
@ -37,7 +37,7 @@
static const char rcsid[] =
"$FreeBSD: src/sbin/newfs_msdos/newfs_msdos.c,v 1.15 2000/10/10 01:49:37 wollman Exp $";
#else
__RCSID("$NetBSD: mkfs_msdos.c,v 1.14 2018/02/04 09:03:23 mrg Exp $");
__RCSID("$NetBSD: mkfs_msdos.c,v 1.15 2019/10/12 09:42:38 martin Exp $");
#endif
#endif /* not lint */
@ -264,7 +264,10 @@ mkfs_msdos(const char *fname, const char *dtype, const struct msdos_options *op)
int ch, fd, fd1;
struct msdos_options o = *op;
int oflags = O_RDWR | O_CREAT;
bool bspf_is_calculated;
again:
bspf_is_calculated = false;
if (o.block_size && o.sectors_per_cluster) {
warnx("Cannot specify both block size and sectors per cluster");
return -1;
@ -556,6 +559,7 @@ mkfs_msdos(const char *fname, const char *dtype, const struct msdos_options *op)
x2 = howmany((RESFTE + MIN(x, maxcls(o.fat_type))) * (o.fat_type / BPN),
bpb.bps * NPB);
if (!bpb.bspf) {
bspf_is_calculated = true;
bpb.bspf = x2;
x1 += (bpb.bspf - 1) * bpb.nft;
}
@ -569,6 +573,11 @@ mkfs_msdos(const char *fname, const char *dtype, const struct msdos_options *op)
return -1;
}
if (cls < mincls(o.fat_type)) {
if (bspf_is_calculated && o.sectors_per_cluster == 0 && bpb.spc > 2) {
/* retry with smaller cluster size */
o.sectors_per_cluster = 2;
goto again;
}
warnx("%u clusters too few clusters for FAT%u, need %u", cls,
o.fat_type, mincls(o.fat_type));
return -1;