[dm-devel] [Bug 14354] Status of barrier requests in LVM and dm-crypt?
Theodore Ts'o
tytso at mit.edu
Mon Oct 12 18:15:10 UTC 2009
Hi, I'm trying to track down a problem relating to ext4 problems, in
kernel bugzilla 14354. Originally it was thought this was a regression
2.6.31->2.6.32-rc1 regression, but the Aneesh Kumar's report shows a
very similar fsck transcript using a 2.6.30-1 kernel (which makes makes
it unclear whether this is really a regression or not), and all three
reports are tied together by the use of device-mapper.
The fsck logs are consistent barriers being disabled. As I recall under
some circumstances device mapper silently drops barrier requests --- I
thought this was fixed for device mapper in some cases. What's the
current status of barrier requests in device mapper? Are they
faithfully passed for standard (non-RAID) LVM2 volumes? When was this
changed? What about dm-crypto volumes? (One of the reports was with a
dm-crypt volume from what I can tell.)
Thanks,
- Ted
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