Re: XFS related hang (was Re: How to send a break? - dump from frozen64bit linux)

[Jan Engelhardt]

>> Too bad XFS does not reinit quota on these commands:
>> 
>> qutoaoff /mp
>> quotaon /mp
>
>Hmm, remount would be saner if we wanted to take that approach...
>
quotacheck would be sanest :) But the struct super_block->remount is 
probably the best idea in kernel space.

>> Yes, it would lock the filesystem for a moment, but that's better than 
>> trying to unmount it under someone having inodes open!
>
>But its not just a moment, a quotacheck needs to scan every inode
>in the filesystem (on disk) to correctly account for all space/inode
>usage.

Yeah right, XFS was designed for large systems rather than for just 
my 262188 files. (The latter of which completes in an "adequate" time of 
a few secs.)

>Its not something to be encouraging people to do frequently,
>
Certainly not, but XFS has the advange of bulkstat for quota scanning.
`quotacheck` on vfsv0 quota databases always takes longer IMO.

>and it would also be very difficult to correctly implement (while the
>filesystem is actively being modified I mean).
>
Noted.


Jan Engelhardt
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