Tejun Heo wrote: > With STANDBYDOWN tracking added, libata.spindown_compat isn't > necessary anymore. If userspace shutdown(8) issues STANDBYNOW, libata > warns. If userspace shutdown(8) doesn't issue STANDBYNOW, libata does > the right thing. Userspace can tell whether kernel supports spindown > by testing whether sysfs node manage_start_stop exists as before. > > Signed-off-by: Tejun Heo <[EMAIL PROTECTED]> > --- > > As many distros don't do anything to libata devices on shutdown which > means we can avoid a lot of trouble by tracking spindown status (done) > and which, in turn, obsoletes libata.spindown_compat. I should have > researched better before staring this mess. Sorry but the situation > is much better now. :-) > > I'll attach the updated version of http://linux-ata.org/shutdown.html > as a reply to this mail. > > If you find any problem in the updated scheme, please let me know. > > Thanks. > > diff --git a/Documentation/feature-removal-schedule.txt > b/Documentation/feature-removal-schedule.txt > index 498ff31..5c8695a 100644 > --- a/Documentation/feature-removal-schedule.txt > +++ b/Documentation/feature-removal-schedule.txt > @@ -328,21 +328,20 @@ Who: Adrian Bunk <[EMAIL PROTECTED]> > > --------------------------- > > -What: libata.spindown_compat module parameter > +What: libata spindown skipping and warning > When: Dec 2008 > -Why: halt(8) synchronizes caches for and spins down libata disks > - because libata didn't use to spin down disk on system halt > - (only synchronized caches). > - Spin down on system halt is now implemented and can be tested > - using sysfs node /sys/class/scsi_disk/h:c:i:l/manage_start_stop. > +Why: Some halt(8) implementations synchronize caches for and spin > + down libata disks because libata didn't use to spin down disk on > + system halt (only synchronized caches). > + Spin down on system halt is now implemented. sysfs node > + /sys/class/scsi_disk/h:c:i:l/manage_start_stop is present if > + spin down support is available. > Because issuing spin down command to an already spun down disk > - makes some disks spin up just to spin down again, the old > - behavior needs to be maintained till userspace tool is updated > - to check the sysfs node and not to spin down disks with the > - node set to one. > - This module parameter is to give userspace tool the time to > - get updated and should be removed after userspace is > - reasonably updated. > + makes some disks spin up just to spin down again, libata tracks > + device spindown status to skip the extra spindown command and > + warn about it. > + This is to give userspace tools the time to get updated and will > + be removed after userspace is reasonably updated. > Who: Tejun Heo <[EMAIL PROTECTED]> > > ---------------------------
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