Yes, you are right not all drives are ata_host.
But if you connect a SATA drive it is assigned ata_host
look at ahci driver and how it attaches to libata.
I am doing some custom work and I am not interested in recompiling kernel with
ahci and libata compiled separately.
Thanks
From: "Valdis.Kletnieks@xxxxxx" <Valdis.Kletnieks@xxxxxx>
To: Com Developer <comdeveloper@xxxxxxxxx>
Cc: kernelnewbies <kernelnewbies@xxxxxxxxxxxxxxxxx>
Sent: Monday, August 19, 2013 11:09 PM
Subject: Re: /dev/sda to ata_host
On Mon, 19 Aug 2013 15:41:15 -0700, Com Developer said:
> Is there any way to reverse map device name /dev/sda to a the ata_host
> structure the drive is attached to?
What problem are you trying to solve with this reverse mapping?
(Hint - I'm not convinced that all devices named /dev/sd* have an ata_host
structure. I'm reasonably sure that the large disk arrays I have on some systems
at work are *not* ATA, as they present as SCSI fiberchannel devices.
% ls -l /dev/sdaaw
brw-r----- 1 root disk 133, 576 Aug 17 07:57 /dev/sdaaw
and dmesg tells me:
Vendor: IBM Model: DCS9550 Rev: 4.03
Type: Direct-Access ANSI SCSI revision: 05
sdaaw : very big device. try to use READ CAPACITY(16).
SCSI device sdaaw: 15628087296 512-byte hdwr sectors (8001581 MB)
sdaaw: Write Protect is off
sdaaw: Mode Sense: a7 00 10 08
SCSI device sdaaw: drive cache: write through w/ FUA
sdaaw : very big device. try to use READ CAPACITY(16).
SCSI device sdaaw: 15628087296 512-byte hdwr sectors (8001581 MB)
sdaaw: Write Protect is off
sdaaw: Mode Sense: a7 00 10 08
SCSI device sdaaw: drive cache: write through w/ FUA
sdaaw: unknown partition table
sd 3:0:7:96: Attached scsi disk sdaaw
sd 3:0:7:96: Attached scsi generic sg731 type 0
I'm suspecting there's no ata_host involved here, as we never notice it
as an ATA drive.
(And no, that device name isn't a boo-boo - the box really *does*
have visibility to 768 8T LUNs (OK, so it's actually 8 fiberchannel
paths to 96 LUNs. ;)
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