TRIM patches

[Tim Bisson]

Hi,

Here are the trim patches. I tried to break them up into functional units so that a review will hopefully be easier.

I also added support for fdisk, so you can trim a whole device with -I, or just a partition using -u.

The dependencies are pretty simple:
* everything depends on 1
* 7 depends on 5

Tim

----------

1. trim_dev_support_1.diff
	* enables device support for trim (scsi_da, ahci, cam, new ioctl, sysctl)

2. hammer_2.diff
	* enables trimming device/slice before creating new fs on it

3. rc_order_swap_3.diff
	* makes swapon start just after savecore

4.  swap_support_4.diff
	* enables trimming of swap slice before it is turned on

5. online_trim_mount_option_5.diff
	* create new mount option -o trim 

6. ufs_support_6.diff
	* enables trimming device/slice before create new fs on it 

7. online_ufs_7.diff
	* enables online trimming of UFS file system.

8 fdisk_8.diff
	* provides trimming support with fdisk (-I or -u)


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