On Sun, 15 Jul 2007, Alan Stern wrote:
On Sun, 15 Jul 2007 [email protected] wrote:
(1) Filesystems mounted before the hibernation are untouchable
When there's a memory snapshot, either in the form of a hibernation image,
or in the form of the "old" kernel and processes available to the "new"
kexeced kernel responsible for saving their memory, the filesystems mounted
before the hibernation should not be accessed, even for reading, because
that would cause their on-disk state to be inconsistent with the snapshot
and might lead to a filesystem corruption.
AFAIK this is only the case with ext3, all other filesystems could be
accessed read-only safely
this is arguably a bug with ext3 (and has been discussed as such), but
right now the ext3 team has decided not to change this bahavior so
hibernate needs to work around it. but don't mistake a work-around for a
single (admittedly very popular) filesystem with a hard and fast
directive.
Isn't is possible to avoid this problem by mounting an ext3 filesystem
as readonly ext2? Provided the filesystem isn't dirty it should be
doable. (And provided the filesystem doesn't use any ext3 extensions
that are incompatible with ext2.)
from the last discussion I saw on the kernel mailing list, no. the act of
mounting the ext3 filesystem as ext2 read-only will change it as the
unsupported extentions get turned off (and I think the journal contents at
least are lost as part of this)
David Lang
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