ceph: try to allocate enough memory for reserved caps

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ceph_reserve_caps() may not reserve enough caps under high memory
pressure, but it saved the needed caps number that expected to
be reserved. When getting caps, crash would happen due to number
mismatch.

Now we will try to trim more caps when failing to allocate memory
for caps need to be reserved, then try again. If still failing to
allocate memory, return -ENOMEM.

Signed-off-by: Zhi Zhang <zhang.david2011@gmail.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

...

This commit is contained in:

Zhi Zhang 2018-01-24 21:24:33 +08:00 • committed by Ilya Dryomov

parent 0f439c746c

commit e30ee58121

4 changed files with 74 additions and 16 deletions

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61

fs/ceph/caps.c

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24

fs/ceph/mds_client.c

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3

fs/ceph/mds_client.h

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2

fs/ceph/super.h

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