With current code after a call to:
bdev = blkdev_get_by_path(dev_name, mode, fs_type);
size = i_size_read(bdev->bd_inode);
part_size = bdev->bd_part->nr_sects << 9;
I get the following bad results:
dev_name == /dev/ram0
foo: [foo_mount:880] size=0x40000000 bdev=ffff88003dc24340 \
bd_inode=ffff88003dc24430 bd_part=ffff88003ca22848 part_size=0x40000000
dev_name == /dev/ram0p1
foo: [foo_mount:880] size=0x40000000 bdev=ffff88003d2f6d80 \
bd_inode=ffff88003d2f6e70 bd_part=ffff88003ca22848 part_size=0x40000000
dev_name == /dev/ram0p2
foo: [foo_mount:880] size=0x40000000 bdev=ffff88003dc24680 \
bd_inode=ffff88003dc24770 bd_part=ffff88003ca22848 part_size=0x40000000
Note how all three bdev(s) point to the same bd_part.
This is do to a single bad clubber in brd_probe() which is
removed in this patch:
- *part = 0;
because of this all 3 bdev(s) above get to point to the same bd_part[0]
While at it fix/rename brd_init_one() since all devices are created on
load of driver, brd_probe() will never be called with a new un-created
device.
brd_init_one() is now renamed to brd_find() which is what it does.
TODO: There is one more partitions BUG regarding
brd_direct_access() which is fixed on the next patch.
Signed-off-by: Boaz Harrosh <boaz@xxxxxxxxxxxxx>
---
drivers/block/brd.c | 19 ++++++++-----------
1 file changed, 8 insertions(+), 11 deletions(-)
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index c7d138e..92334f6 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -523,22 +523,20 @@ static void brd_free(struct brd_device *brd)
kfree(brd);
}
-static struct brd_device *brd_init_one(int i)
+static struct brd_device *brd_find(int i)
{
struct brd_device *brd;
list_for_each_entry(brd, &brd_devices, brd_list) {
if (brd->brd_number == i)
- goto out;
+ return brd;
}
- brd = brd_alloc(i);
- if (brd) {
- add_disk(brd->brd_disk);
- list_add_tail(&brd->brd_list, &brd_devices);
- }
-out:
- return brd;
+ /* brd always allocates all its devices at load time, therefor
+ * brd_probe will never be called with a new brd_number
+ */
+ printk(KERN_EROR "brd: brd_find unexpected device %d\n", i);
+ return NULL;
}
static void brd_del_one(struct brd_device *brd)
@@ -554,11 +552,10 @@ static struct kobject *brd_probe(dev_t dev, int *part, void *data)
struct kobject *kobj;
mutex_lock(&brd_devices_mutex);
- brd = brd_init_one(MINOR(dev) >> part_shift);
+ brd = brd_find(MINOR(dev) >> part_shift);
kobj = brd ? get_disk(brd->brd_disk) : NULL;
mutex_unlock(&brd_devices_mutex);
- *part = 0;
return kobj;
}
--
1.9.3
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
