Can someone explain what mount phase is, along with an example?

On 12/4/19 9:26 AM, Spike White wrote:
> In persistent mounts (found in /etc/fstab), there's two settings that 
> tell the init process in which phase to run fsck and in which phase to 
> mount.  So in persistent mounts, it's easy to order the mounts during 
> boot time.  If necessary.  And (as you say, the "_netdev" flag tells the 
> boot process to mount a fs very late.)
> 
> I'm not sure that sorting the lines in /etc/fstab would accomplish this, 
> I thought modern Linux versions fsck in parallel now, not sequentially.  
> (I know they probe multiple SCSI buses in parallel.)
> 
> But I suppose autofs has no concept of mount phase?
> 
> Spike
> 
> On Wed, Dec 4, 2019 at 4:36 AM Pavel Březina <pbrez...@redhat.com 
> <mailto:pbrez...@redhat.com>> wrote:
> 
>     On 11/30/19 5:41 PM, Oguzhan Eris wrote:
>      > Hi everyone.
>      >
>      > First off, thanks to everyone who's ever worked on SSSD.  It's
>     easily in my top 5 favorite FOSS projects out there.
>      >
>      > I am not sure if this is the right way to ask for an enhancement,
>     or whether I should file an issue on GitHub,  but I am running into
>     an issue that's described in this Red Hat page
>     https://access.redhat.com/solutions/3673501 (login required)
>      >
>      > Basically for an automount map where I need nested top level paths:
>      >
>      > /mnt/foo
>      > /mnt/foo/bar
>      >
>      > each defined by their own map objects.  SSSD does not handle this
>     (neither does LDAP directly from autofs) because the return map from
>     LDAP is unsorted, and if the maps are provided to autofs ordered as:
>      >
>      > /mnt/foo/bar
>      > /mnt/foo
>      >
>      > the /mnt/foo map masks the previous /mnt/foo/bar map  and you'll
>     only get the entries from /mnt/foo
>      >
>      > Using file based mount maps, one can easily sort the top level
>     maps, and get around this issue.
>      > Would it be possible to have SSSD return the maps from LDAP query
>     in a sorted way?   There is an LDAP control that most LDAP servers
>     support to return a sorted output, (
>      > https://ldapwiki.com/wiki/Server%20Side%20Sort%20Control ) but
>     with so many clients and a large list, this might be better left to
>     the client to do instead.
>      >
>      > I'm happy to help out if someone can point me in the right
>     direction in the code.
> 
>     SSSD is just a data provider, if some sorting is needed I do not think
>     it should be done in SSSD (unless autofs interface says so) but rather
>     in autofs itself.
> 
>     CCing Ian, do you have any thoughts on this?
> 
>      >
>      > Thanks again
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