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| author | Kay Sievers <kay.sievers@vrfy.org> | 2008-05-06 22:31:33 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-05-14 10:37:57 -0700 |
| commit | 30f2f0eb4bd2c43d10a8b0d872c6e5ad8f31c9a0 (patch) | |
| tree | deb8d2a749cd737d9abead1b4cc8321d00dbaee4 /block | |
| parent | 9604006d283fb67dda5ee9e0e15b7cc6c62e1557 (diff) | |
| download | lwn-30f2f0eb4bd2c43d10a8b0d872c6e5ad8f31c9a0.tar.gz lwn-30f2f0eb4bd2c43d10a8b0d872c6e5ad8f31c9a0.zip | |
block: do_mounts - accept root=<non-existant partition>
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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/genhd.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/block/genhd.c b/block/genhd.c index fda9c7a63c29..129ad939f9dd 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -653,7 +653,7 @@ void genhd_media_change_notify(struct gendisk *disk) EXPORT_SYMBOL_GPL(genhd_media_change_notify); #endif /* 0 */ -dev_t blk_lookup_devt(const char *name) +dev_t blk_lookup_devt(const char *name, int part) { struct device *dev; dev_t devt = MKDEV(0, 0); @@ -661,7 +661,11 @@ dev_t blk_lookup_devt(const char *name) mutex_lock(&block_class_lock); list_for_each_entry(dev, &block_class.devices, node) { if (strcmp(dev->bus_id, name) == 0) { - devt = dev->devt; + struct gendisk *disk = dev_to_disk(dev); + + if (part < disk->minors) + devt = MKDEV(MAJOR(dev->devt), + MINOR(dev->devt) + part); break; } } @@ -669,7 +673,6 @@ dev_t blk_lookup_devt(const char *name) return devt; } - EXPORT_SYMBOL(blk_lookup_devt); struct gendisk *alloc_disk(int minors) |