- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

remove duplicate semicolons where possible.

Approved by: cperciva
MFC after: 1 week

Improve error reporting in diskinfo(8) by not displaying errno when
it doesn't make sense.

Fix `diskinfo -t` operation for disks smaller then 8GB or bigger then 2TB.
Tested to work with 1.44MB floppy, 4GB USB stick and 4TB disk array.

Approved by: re (kib)

Plumb device physical path reporting from CAM devices, through GEOM and
DEVFS, and make it accessible via the diskinfo utility.

Extend GEOM's generic attribute query mechanism into generic disk consumers.
sys/geom/geom_disk.c:
sys/geom/geom_disk.h:
sys/cam/scsi/scsi_da.c:
sys/cam/ata/ata_da.c:
- Allow disk providers to implement a new method which can override
the default BIO_GETATTR response, d_getattr(struct bio *). This
function returns -1 if not handled, otherwise it returns 0 or an
errno to be passed to g_io_deliver().

sys/cam/scsi/scsi_da.c:
sys/cam/ata/ata_da.c:
- Don't copy the serial number to dp->d_ident anymore, as the CAM XPT
is now responsible for returning this information via
d_getattr()->(a)dagetattr()->xpt_getatr().

sys/geom/geom_dev.c:
- Implement a new ioctl, DIOCGPHYSPATH, which returns the GEOM
attribute "GEOM::physpath", if possible. If the attribute request
returns a zero-length string, ENOENT is returned.

usr.sbin/diskinfo/diskinfo.c:
- If the DIOCGPHYSPATH ioctl is successful, report physical path
data when diskinfo is executed with the '-v' option.

Submitted by: will
Reviewed by: gibbs
Sponsored by: Spectra Logic Corporation

Add generic attribute change notification support to GEOM.

sys/sys/geom/geom.h:
Add a new attrchanged method field to both g_class
and g_geom.

sys/sys/geom/geom.h:
sys/geom/geom_event.c:
- Provide the g_attr_changed() function that providers
can use to advertise attribute changes.
- Perform delivery of attribute change notifications
from a thread context via the standard GEOM event
mechanism.

sys/geom/geom_subr.c:
Inherit the attrchanged method from class to geom (class instance).

sys/geom/geom_disk.c:
Provide disk_attr_changed() to provide g_attr_changed() access
to consumers of the disk API.

sys/cam/scsi/scsi_pass.c:
sys/cam/scsi/scsi_da.c:
sys/geom/geom_dev.c:
sys/geom/geom_disk.c:
Use attribute changed events to track updates to physical path
information.

sys/cam/scsi/scsi_da.c:
Add AC_ADVINFO_CHANGED to the registered asynchronous CAM
events for this driver. When this event occurs, and
the updated buffer type references our physical path
attribute, emit a GEOM attribute changed event via the
disk_attr_changed() API.

sys/cam/scsi/scsi_pass.c:
Add AC_ADVINFO_CHANGED to the registered asynchronous CAM
events for this driver. When this event occurs, update
the physical patch devfs alias for this pass instance.

Submitted by: gibbs
Sponsored by: Spectra Logic Corporation

Don't consider ioctl returning error as a fatal error and move on to next
disk. When multiple devices are specified, a non-supporting ioctl will
cause diskinfo(8) to stop at the point which does not seem to be necessary.

Ok'ed by: phk
MFC after: 1 month

Make diskinfo report disk stripe size and offset. It should help users to
make file systems optimally aligned and tuned for better performance.

Don't bother obtaining the ident if we are not going to print it.

Print provider's ident when in verbose mode.

Add -c to SYNOPSIS and usage().

Add -c option that calculates the overhead of read I/O ops.

Actually negative size is possible for file system, but not for disk.

In verbose mode print disk sizes in human readable form as well.

OK'ed by: phk

Make WARNS=5 clean.

Prodded by: Stefan Farfeleder <stefan@fafoe.narf.at>

Sync manpage's synopsis with usage().

I forgot a rather crucial cast when I made this sectorsize agnostic.

Tune iteration counts a bit.

Diskinfo is a small program to access the basic properties of a disk device:
sectorsize, mediasize etc.

It also contains a small and naïve benchmark which reports on seek
and transfer performance.