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authorYan, Zheng <zyan@redhat.com>2017-01-29 22:15:47 +0800
committerIlya Dryomov <idryomov@gmail.com>2017-02-20 12:16:07 +0100
commitc1944fedd8c492ce1c1a99ca9064dcc7bafa80e9 (patch)
tree391d043097c793dacc36aae7c9c9e354d80553bb /fs/ceph/caps.c
parent00f06cba53f53f3f7be8ac4f9ba2c2f6a94bca6f (diff)
downloadlinux-c1944fedd8c492ce1c1a99ca9064dcc7bafa80e9.tar.bz2
ceph: avoid calling ceph_renew_caps() infinitely
__ceph_caps_mds_wanted() ignores caps from stale session. So the return value of __ceph_caps_mds_wanted() can keep the same across ceph_renew_caps(). This causes try_get_cap_refs() to keep calling ceph_renew_caps(). The fix is ignore the session valid check for the try_get_cap_refs() case. If session is stale, just let the caps requester sleep. Signed-off-by: Yan, Zheng <zyan@redhat.com>
Diffstat (limited to 'fs/ceph/caps.c')
-rw-r--r--fs/ceph/caps.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index ed8c7addce91..3c2dfd72e5b2 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -867,7 +867,7 @@ int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
/*
* Return caps we have registered with the MDS(s) as 'wanted'.
*/
-int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
+int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check)
{
struct ceph_cap *cap;
struct rb_node *p;
@@ -875,7 +875,7 @@ int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
cap = rb_entry(p, struct ceph_cap, ci_node);
- if (!__cap_is_valid(cap))
+ if (check && !__cap_is_valid(cap))
continue;
if (cap == ci->i_auth_cap)
mds_wanted |= cap->mds_wanted;
@@ -2491,7 +2491,7 @@ again:
ret = 1;
goto out_unlock;
}
- mds_wanted = __ceph_caps_mds_wanted(ci);
+ mds_wanted = __ceph_caps_mds_wanted(ci, false);
if (need & ~(mds_wanted & need)) {
dout("get_cap_refs %p caps were dropped"
" (session killed?)\n", inode);