RE: [PATCH] sd: preserve sysfs updates to max_sectors_kb

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> -----Original Message-----
> From: Bart Van Assche [mailto:Bart.VanAssche@xxxxxxx]
> Sent: Friday, August 18, 2017 4:47 PM
> To: hch@xxxxxxxxxxxxx; Viswas G <viswas.g@xxxxxxxxxxxxx>; Gerry
> Morong <gerry.morong@xxxxxxxxxxxxx>; Mahesh Rajashekhara
> <mahesh.rajashekhara@xxxxxxxxxxxxx>; POSWALD@xxxxxxxx; Scott
> Benesh <scott.benesh@xxxxxxxxxxxxx>; Don Brace
> <don.brace@xxxxxxxxxxxxx>; Bader Ali - Saleh
> <bader.alisaleh@xxxxxxxxxxxxx>; Kevin Barnett
> <kevin.barnett@xxxxxxxxxxxxx>; joseph.szczypek@xxxxxxx; Scott Teel
> <scott.teel@xxxxxxxxxxxxx>; jejb@xxxxxxxxxxxxxxxxxx; Justin Lindley
> <justin.lindley@xxxxxxxxxxxxx>; John Hall <John.Hall@xxxxxxxxxxxxx>
> Cc: linux-scsi@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH] sd: preserve sysfs updates to max_sectors_kb
> 
> EXTERNAL EMAIL
> 
> 
> On Fri, 2017-08-18 at 21:29 +0000, Don Brace wrote:
> > As far as I can see, udev looks for file access in sysfs.
> > I am not exactly sure which rule changes this. It was added in more recent
> > distros. Can someone help me out?
> 
> Hello Don,
> 
> Can you check on your test system which udev rule changes
> max_sectors_kb? I
> have checked two recent Linux distro's but haven't been able to find such a
> udev rule:
> $ grep -rw max_sectors_kb /usr/lib/udev/rules.d /etc/udev/rules.d | wc -l
> 0
> 
> Thanks,
> 
> Bart.

On my system it is 60-block.rules, and it is the last rule in that rule file.
--
# do not edit this file, it will be overwritten on update

# enable in-kernel media-presence polling
ACTION=="add", SUBSYSTEM=="module", KERNEL=="block", ATTR{parameters/events_dfl_poll_msecs}=="0", \
  ATTR{parameters/events_dfl_poll_msecs}="2000"

# forward scsi device event to corresponding block device
ACTION=="change", SUBSYSTEM=="scsi", ENV{DEVTYPE}=="scsi_device", TEST=="block", ATTR{block/*/uevent}="change"

# watch metadata changes, caused by tools closing the device node which was opened for writing
ACTION!="remove", SUBSYSTEM=="block", KERNEL=="loop*|nvme*|sd*|vd*|xvd*|pmem*", OPTIONS+="watch"




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