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ceph: avoid updating mds_wanted too frequently 

user space may open/close single file frequently. It's not good
to send a clientcaps message to mds for each open/close syscall.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng 2017-01-12 17:18:00 +08:00 committed by Ilya Dryomov
parent 7c94ba2790
commit eb65b919b9
1 changed files with 9 additions and 3 deletions
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12
fs/ceph/caps.c
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@ -1184,6 +1184,13 @@ static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
delayed = 1;
}
ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
if (want & ~cap->mds_wanted) {
/* user space may open/close single file frequently.
* This avoids droping mds_wanted immediately after
* requesting new mds_wanted.
*/
__cap_set_timeouts(mdsc, ci);
}
cap->issued &= retain; /* drop bits we don't want */
if (cap->implemented & ~cap->issued) {
@ -2485,15 +2492,14 @@ again:
goto out_unlock;
}
mds_wanted = __ceph_caps_mds_wanted(ci);
if ((mds_wanted & need) != need) {
if (need & ~(mds_wanted & need)) {
dout("get_cap_refs %p caps were dropped"
" (session killed?)\n", inode);
*err = -ESTALE;
ret = 1;
goto out_unlock;
}
if ((mds_wanted & file_wanted) ==
(file_wanted & (CEPH_CAP_FILE_RD|CEPH_CAP_FILE_WR)))
if (!(file_wanted & ~mds_wanted))
ci->i_ceph_flags &= ~CEPH_I_CAP_DROPPED;
}