Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: zfs-linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1600060
Title:
ZFS "partially filled holes lose birth time"
Status in zfs-linux package in Ubuntu:
Confirmed
Status in zfs-linux package in Debian:
Fix Released
Bug description:
Note: This is different from Launchpad bug #1557151. This is another,
similar, bug.
Bug description from Matt Ahrens at OpenZFS:
"If a ZFS object contains a hole at level one, and then a data block is
created at level 0 underneath that l1 block, l0 holes will be created.
However, these l0 holes do not have the birth time property set; as a
result, incremental sends will not send those holes.
Fix is to modify the dbuf_read code to fill in birth time data."
-- https://www.illumos.org/issues/6513
From pcd on IRC in #zfsonlinux:
"basically, what happens is this: if you zero out an entire l1 indirect
block's worth of data (several megabytes), we save space by storing that
entire indirect block as a single hole in an l2 indirect block with
birth time N. If you then modify some of the data under that, but not
all of it, when the l1 indirect block is filled back in with mostly
holes and some data blocks, the wholes will not have any"
Fixed in ZoL here:
https://github.com/zfsonlinux/zfs/commit/bc77ba73fec82d37c0b57949ec29edd9aa207677
This has *not* been merged into a ZoL release yet, nor the release
branch.
This is a very unfortunate bug because the fix only helps you moving forward.
A separate bug has been opened to propose a fix for that:
https://www.illumos.org/issues/7175
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