On 2/25/22 8:29 AM, Chuck Lever III wrote:
On Feb 23, 2022, at 1:16 PM, Dai Ngo <dai.ngo@xxxxxxxxxx> wrote:
Add callout function nfsd4_lm_lock_expired for lm_lock_expired.
If lock request has conflict with courtesy client then expire the
courtesy client and return no conflict to caller.
Signed-off-by: Dai Ngo <dai.ngo@xxxxxxxxxx>
---
fs/nfsd/nfs4state.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 6a10f089ef4c..6bca727978ea 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -6578,10 +6578,47 @@ nfsd4_lm_notify(struct file_lock *fl)
}
}
+/**
+ * nfsd4_lm_lock_expired - check if lock conflict can be resolved.
+ *
+ * @fl: pointer to file_lock with a potential conflict
+ * Return values:
+ * %false: real conflict, lock conflict can not be resolved.
+ * %true: no conflict, lock conflict was resolved.
+ *
+ * Note that this function is called while the flc_lock is held.
+ */
+static bool
+nfsd4_lm_lock_expired(struct file_lock *fl)
+{
+ struct nfs4_lockowner *lo;
+ struct nfs4_client *clp;
+ bool rc = false;
+
+ if (!fl)
+ return false;
+ lo = (struct nfs4_lockowner *)fl->fl_owner;
+ clp = lo->lo_owner.so_client;
+
+ /* need to sync with courtesy client trying to reconnect */
+ spin_lock(&clp->cl_cs_lock);
+ if (test_bit(NFSD4_CLIENT_EXPIRED, &clp->cl_flags))
+ rc = true;
+ else {
+ if (test_bit(NFSD4_CLIENT_COURTESY, &clp->cl_flags)) {
+ set_bit(NFSD4_CLIENT_EXPIRED, &clp->cl_flags);
+ rc = true;
+ }
+ }
+ spin_unlock(&clp->cl_cs_lock);
+ return rc;
+}
+
static const struct lock_manager_operations nfsd_posix_mng_ops = {
.lm_notify = nfsd4_lm_notify,
.lm_get_owner = nfsd4_fl_get_owner,
.lm_put_owner = nfsd4_fl_put_owner,
I started to pull this series, but quickly realized it isn't
based on the current contents of the NFSD for-next topic
branch, which changes the names of nfsd4_fl_{put,get}_owner
as we discussed during v13 review.
The upshot is that I would have to apply each of these patches
by hand, which is tedious and error prone for more than one
or two patches.
Please pull the latest from my for-next branch, rebase this
series, and then post again. Thanks!'
will do in v15.
-Dai
+ .lm_lock_expired = nfsd4_lm_lock_expired,
};
static inline void
--
2.9.5
--
Chuck Lever
