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block: do_mounts - accept root=<non-existant partition>

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Some devices, like md, may create partitions only at first access,
so allow root= to be set to a valid non-existant partition of an
existing disk. This applies only to non-initramfs root mounting.

This fixes a regression from 2.6.24 which did allow this to happen and
broke some users machines :(

Acked-by: Neil Brown <neilb@suse.de>
Tested-by: Joao Luis Meloni Assirati <assirati@nonada.if.usp.br>
Cc: stable <stable@kernel.org>
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kay Sievers
2008-05-06 22:31:33 +02:00
committed by Greg Kroah-Hartman
parent 9604006d28
commit 30f2f0eb4b
3 changed files with 34 additions and 6 deletions
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4
include/linux/genhd.h
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@@ -525,7 +525,7 @@ struct unixware_disklabel {
#define ADDPART_FLAG_RAID 1
#define ADDPART_FLAG_WHOLEDISK 2
extern dev_t blk_lookup_devt(const char *name);
extern dev_t blk_lookup_devt(const char *name, int part);
extern char *disk_name (struct gendisk *hd, int part, char *buf);
extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
@@ -553,7 +553,7 @@ static inline struct block_device *bdget_disk(struct gendisk *disk, int index)
static inline void printk_all_partitions(void) { }
static inline dev_t blk_lookup_devt(const char *name)
static inline dev_t blk_lookup_devt(const char *name, int part)
{
dev_t devt = MKDEV(0, 0);
return devt;