online resizing of devices/filesystems (2.6)

[Joe Thornber]

Hi,

Should genhd.h:set_capacity() find and update the i_size field of the
inode for the device ?

The BLKGETSIZE and BLKGETSIZE64 ioctls report the size in the devices
inode:

	case BLKGETSIZE:
		if ((bdev->bd_inode->i_size >> 9) > ~0UL)
			return -EFBIG;
		return put_ulong(arg, bdev->bd_inode->i_size >> 9);
	case BLKGETSIZE64:
		return put_u64(arg, bdev->bd_inode->i_size);

Currently people have to close and reopen the device in order for a
size change to take effect.  This is a problem if people want to do
online resizing of a filesystem (supported by xfs and resier).

- Joe

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