The following commit has been merged in the master branch:
commit 64d7715c0247734731ef4cc8be5de32ee7c4a1f6
Author: Michael Meffie <[email protected]>
Date: Mon Dec 23 12:10:36 2013 -0500
vol: reset nextVnodeUnique when uniquifier rolls over
The on disk uniquifier counter is set to 200 more than the current
nextVnodeUnique counter when the volume information is updated to disk. When
the nextVnodeUnique is near UINT32_MAX, then the uniquifier counter rolls
over. This can happen during a volume header update due to
VBumpVolumeUsage_r().
With this change, the nextVnodeUnique customer is reset to 2 and the
uniquifier is reset to 202 when a roll over occurs. (uniquifier of 1 is
reserved for the root vnode.)
With this change, the number of possible uniquifier numbers is limited to
200 less than UINT32_MAX.
The following shows a series of vnode creation/deletions to illustrate
the uniquifier rollover before this commit:
fid = 536870918.4.4294967114, nextVnodeUnique = 4294967115, uniquifier =
4294967295
fid = 536870918.4.4294967115, nextVnodeUnique = 4294967116, uniquifier =
4294967295
fid = 536870918.4.4294967116, nextVnodeUnique = 4294967117, uniquifier = 21
fid = 536870918.4.4294967117, nextVnodeUnique = 4294967118, uniquifier = 22
and after this commit:
fid = 536870918.4.4294967115, nextVnodeUnique = 4294967116, uniquifier =
4294967295
fid = 536870918.4.4294967116, nextVnodeUnique = 2, uniquifier = 202
fid = 536870918.4.2, nextVnodeUnique = 3, uniquifier = 202
fid = 536870918.4.3, nextVnodeUnique = 4, uniquifier = 202
Change-Id: I93c8a7cf47e39b8701265d6507cfc4f8c1352ddc
Reviewed-on: http://gerrit.openafs.org/10617
Tested-by: BuildBot <[email protected]>
Reviewed-by: Benjamin Kaduk <[email protected]>
Reviewed-by: Jeffrey Altman <[email protected]>
Reviewed-by: Derrick Brashear <[email protected]>
src/vol/volume.c | 24 ++++++++++++++++++++----
1 files changed, 20 insertions(+), 4 deletions(-)
--
OpenAFS Master Repository
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