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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>
This commit is contained in:
Yan, Zheng 2017-01-29 22:15:47 +08:00 committed by Ilya Dryomov
parent 00f06cba53
commit c1944fedd8
3 changed files with 5 additions and 5 deletions
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6
fs/ceph/caps.c
View File

@ -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'. * 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 ceph_cap *cap;
struct rb_node *p; 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)) { for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
cap = rb_entry(p, struct ceph_cap, ci_node); cap = rb_entry(p, struct ceph_cap, ci_node);
if (!__cap_is_valid(cap)) if (check && !__cap_is_valid(cap))
continue; continue;
if (cap == ci->i_auth_cap) if (cap == ci->i_auth_cap)
mds_wanted |= cap->mds_wanted; mds_wanted |= cap->mds_wanted;
@ -2491,7 +2491,7 @@ again:
ret = 1; ret = 1;
goto out_unlock; goto out_unlock;
} }
mds_wanted = __ceph_caps_mds_wanted(ci); mds_wanted = __ceph_caps_mds_wanted(ci, false);
if (need & ~(mds_wanted & need)) { if (need & ~(mds_wanted & need)) {
dout("get_cap_refs %p caps were dropped" dout("get_cap_refs %p caps were dropped"
" (session killed?)\n", inode); " (session killed?)\n", inode);

2
fs/ceph/file.c
View File

@ -283,7 +283,7 @@ int ceph_open(struct inode *inode, struct file *file)
spin_lock(&ci->i_ceph_lock); spin_lock(&ci->i_ceph_lock);
if (__ceph_is_any_real_caps(ci) && if (__ceph_is_any_real_caps(ci) &&
(((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) { (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
int mds_wanted = __ceph_caps_mds_wanted(ci); int mds_wanted = __ceph_caps_mds_wanted(ci, true);
int issued = __ceph_caps_issued(ci, NULL); int issued = __ceph_caps_issued(ci, NULL);
dout("open %p fmode %d want %s issued %s using existing\n", dout("open %p fmode %d want %s issued %s using existing\n",

2
fs/ceph/super.h
View File

@ -602,7 +602,7 @@ static inline int __ceph_caps_wanted(struct ceph_inode_info *ci)
} }
/* what the mds thinks we want */ /* what the mds thinks we want */
extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci); extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check);
extern void ceph_caps_init(struct ceph_mds_client *mdsc); extern void ceph_caps_init(struct ceph_mds_client *mdsc);
extern void ceph_caps_finalize(struct ceph_mds_client *mdsc); extern void ceph_caps_finalize(struct ceph_mds_client *mdsc);