Hello list!
So, I am currently trying to figure where and how XATTRs "space" is
actually released, as it appears they are not for us. Both in releasing
the entry in unlinked-list, and the space they take up.
In my tests, I create 1MB xattr files to take up a 1GB of space, then
delete them all. The space is never returned, including after remount.
In zfs_remove(), they are placed on the zfs_unlinked_add(), and are
supposed to be released next mount time.
If I count up the number of entries that zfs_unlinked_drain() I get
something like:
ZFS: unlinked drain completed (22705).
That's 22705 zget()s, and it sets z_unlinked.
But that is all, if I create another xattr, and call rm, next mount:
ZFS: unlinked drain completed (22706).
Once z_unlinked is set, how is the node supposed to be cleared out? (and
hopefully the unlinked_link to be made smaller!)
When I tried 1MB xattr on Solaris 10 the space is also not returned, but
(annoyingly! :) ) the latest IllumOS does return the space after remount.
Lund
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