From: Paul Clements Date: Wed, 17 Oct 2007 06:27:36 +0000 (-0700) Subject: NBD: set uninitialized devices to size 0 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4b86a872561ad052bdc6f092a06807822d26beb1;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git NBD: set uninitialized devices to size 0 This fixes errors with utilities (such as LVM's vgscan) that try to scan all devices. Previously this would generate read errors when uninitialized nbd devices were scanned: # vgscan Reading all physical volumes. This may take a while... /dev/nbd0: read failed after 0 of 1024 at 0: Input/output error /dev/nbd0: read failed after 0 of 1024 at 509804544: Input/output error /dev/nbd0: read failed after 0 of 2048 at 0: Input/output error /dev/nbd1: read failed after 0 of 1024 at 509804544: Input/output error /dev/nbd1: read failed after 0 of 2048 at 0: Input/output error From now on, uninitialized nbd devices will have size zero, which prevents these errors. Signed-off-by: Paul Clements Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index dc88bcf320e8..89bdafd88dbd 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -578,6 +578,9 @@ static int nbd_ioctl(struct inode *inode, struct file *file, printk(KERN_WARNING "%s: queue cleared\n", lo->disk->disk_name); if (file) fput(file); + lo->bytesize = 0; + inode->i_bdev->bd_inode->i_size = 0; + set_capacity(lo->disk, 0); return lo->harderror; case NBD_CLEAR_QUE: /* @@ -655,14 +658,14 @@ static int __init nbd_init(void) mutex_init(&nbd_dev[i].tx_lock); init_waitqueue_head(&nbd_dev[i].active_wq); nbd_dev[i].blksize = 1024; - nbd_dev[i].bytesize = 0x7ffffc00ULL << 10; /* 2TB */ + nbd_dev[i].bytesize = 0; disk->major = NBD_MAJOR; disk->first_minor = i; disk->fops = &nbd_fops; disk->private_data = &nbd_dev[i]; disk->flags |= GENHD_FL_SUPPRESS_PARTITION_INFO; sprintf(disk->disk_name, "nbd%d", i); - set_capacity(disk, 0x7ffffc00ULL << 1); /* 2 TB */ + set_capacity(disk, 0); add_disk(disk); }