Messages in this thread | | | Date | Wed, 30 Nov 2011 11:36:11 -0500 (EST) | From | Mikulas Patocka <> | Subject | Re: [dm-devel] [PATCH] deadlock with suspend and quotas |
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On Wed, 30 Nov 2011, Alasdair G Kergon wrote:
> On Wed, Nov 30, 2011 at 01:33:32PM +0000, Alasdair G Kergon wrote: > > Have I missed something in this > > reasoning, Mikulas? > > Ah - counter-example: mmap? > So sync might indeed be required to block on the filesystem iff there > are newly-dirtied pages. > > Alasdair
On non-journaled filesystem, both write and mmap can create dirty pages when suspended.
On ext4 I actually tested mmap, but it blocks any writes to mmaped pages while suspended.
Mikulas
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