ceph: choose readdir frag based on previous readdir reply

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commit b50c2de51e upstream.

The dirfragtree is lazily updated, it's not always accurate. Infinite
loops happens in following circumstance.

- client send request to read frag A
- frag A has been fragmented into frag B and C. So mds fills the reply
  with contents of frag B
- client wants to read next frag C. ceph_choose_frag(frag value of C)
  return frag A.

The fix is using previous readdir reply to calculate next readdir frag
when possible.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Yan, Zheng 2017-04-24 11:56:50 +08:00 • committed by Greg Kroah-Hartman

parent c4c592b2c1

commit 9403514ba1

1 changed files with 12 additions and 7 deletions

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fs/ceph/dir.c

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