From: OGAWA Hirofumi Date: Tue, 23 Mar 2010 20:35:50 +0000 (-0700) Subject: fs/partition/msdos: fix unusable extended partition for > 512B sector X-Git-Tag: firefly_0821_release~9833^2~2501 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8e0cc811e0f8029a7225372fb0951fab102c012f;p=firefly-linux-kernel-4.4.55.git fs/partition/msdos: fix unusable extended partition for > 512B sector Smaller size than a minimum blocksize can't be used, after all it's handled like 0 size. For extended partition itself, this makes sure to use bigger size than one logical sector size at least. Signed-off-by: OGAWA Hirofumi Cc: Daniel Taylor Cc: "H. Peter Anvin" Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/partitions/msdos.c b/fs/partitions/msdos.c index b78385840a55..90be97f1f5a8 100644 --- a/fs/partitions/msdos.c +++ b/fs/partitions/msdos.c @@ -492,9 +492,16 @@ int msdos_partition(struct parsed_partitions *state, struct block_device *bdev) if (!size) continue; if (is_extended_partition(p)) { - /* prevent someone doing mkfs or mkswap on an - extended partition, but leave room for LILO */ - put_partition(state, slot, start, size == 1 ? 1 : 2); + /* + * prevent someone doing mkfs or mkswap on an + * extended partition, but leave room for LILO + * FIXME: this uses one logical sector for > 512b + * sector, although it may not be enough/proper. + */ + sector_t n = 2; + n = min(size, max(sector_size, n)); + put_partition(state, slot, start, n); + printk(" <"); parse_extended(state, bdev, start, size); printk(" >");