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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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3
fs/ceph/mds_client.h
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@@ -444,4 +444,7 @@ ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session);
extern int ceph_trim_caps(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session,
int max_caps);
#endif