ceph: fix file lock interruption

When a lock operation is interrupted, current code sends a unlock request to
MDS to undo the lock operation. This method does not work as expected because
the unlock request can drop locks that have already been acquired.

The fix is use the newly introduced CEPH_LOCK_FCNTL_INTR/CEPH_LOCK_FLOCK_INTR
requests to interrupt blocked file lock request. These requests do not drop
locks that have alread been acquired, they only interrupt blocked file lock
request.

Signed-off-by: Yan, Zheng <zyan@redhat.com>

3 files changed, 62 insertions, 10 deletions

diff --git a/fs/ceph/locks.c b/fs/ceph/locks.c
index fbc39c47bacd..c35c5c614e38 100644
--- a/fs/ceph/locks.c
+++ b/fs/ceph/locks.c
@@ -9,6 +9,8 @@
 #include <linux/ceph/pagelist.h>
 
 static u64 lock_secret;
+static int ceph_lock_wait_for_completion(struct ceph_mds_client *mdsc,
+                                         struct ceph_mds_request *req);
 
 static inline u64 secure_addr(void *addr)
 {
@@ -40,6 +42,9 @@ static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file,
         u64 length = 0;
         u64 owner;
 
+        if (operation != CEPH_MDS_OP_SETFILELOCK || cmd == CEPH_LOCK_UNLOCK)
+                wait = 0;
+
         req = ceph_mdsc_create_request(mdsc, operation, USE_AUTH_MDS);
         if (IS_ERR(req))
                 return PTR_ERR(req);
@@ -68,6 +73,9 @@ static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file,
         req->r_args.filelock_change.length = cpu_to_le64(length);
         req->r_args.filelock_change.wait = wait;
 
+        if (wait)
+                req->r_wait_for_completion = ceph_lock_wait_for_completion;
+
         err = ceph_mdsc_do_request(mdsc, inode, req);
 
         if (operation == CEPH_MDS_OP_GETFILELOCK) {
@@ -96,6 +104,52 @@ static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file,
         return err;
 }
 
+static int ceph_lock_wait_for_completion(struct ceph_mds_client *mdsc,
+                                         struct ceph_mds_request *req)
+{
+        struct ceph_mds_request *intr_req;
+        struct inode *inode = req->r_inode;
+        int err, lock_type;
+
+        BUG_ON(req->r_op != CEPH_MDS_OP_SETFILELOCK);
+        if (req->r_args.filelock_change.rule == CEPH_LOCK_FCNTL)
+                lock_type = CEPH_LOCK_FCNTL_INTR;
+        else if (req->r_args.filelock_change.rule == CEPH_LOCK_FLOCK)
+                lock_type = CEPH_LOCK_FLOCK_INTR;
+        else
+                BUG_ON(1);
+        BUG_ON(req->r_args.filelock_change.type == CEPH_LOCK_UNLOCK);
+
+        err = wait_for_completion_interruptible(&req->r_completion);
+        if (!err)
+                return 0;
+
+        dout("ceph_lock_wait_for_completion: request %llu was interrupted\n",
+             req->r_tid);
+
+        intr_req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETFILELOCK,
+                                            USE_AUTH_MDS);
+        if (IS_ERR(intr_req))
+                return PTR_ERR(intr_req);
+
+        intr_req->r_inode = inode;
+        ihold(inode);
+        intr_req->r_num_caps = 1;
+
+        intr_req->r_args.filelock_change = req->r_args.filelock_change;
+        intr_req->r_args.filelock_change.rule = lock_type;
+        intr_req->r_args.filelock_change.type = CEPH_LOCK_UNLOCK;
+
+        err = ceph_mdsc_do_request(mdsc, inode, intr_req);
+        ceph_mdsc_put_request(intr_req);
+
+        if (err && err != -ERESTARTSYS)
+                return err;
+
+        wait_for_completion(&req->r_completion);
+        return 0;
+}
+
 /**
  * Attempt to set an fcntl lock.
  * For now, this just goes away to the server. Later it may be more awesome.
@@ -143,11 +197,6 @@ int ceph_lock(struct file *file, int cmd, struct file_lock *fl)
                                      err);
                         }
                 }
-
-        } else if (err == -ERESTARTSYS) {
-                dout("undoing lock\n");
-                ceph_lock_message(CEPH_LOCK_FCNTL, op, file,
-                                  CEPH_LOCK_UNLOCK, 0, fl);
         }
         return err;
 }
@@ -186,11 +235,6 @@ int ceph_flock(struct file *file, int cmd, struct file_lock *fl)
                                           file, CEPH_LOCK_UNLOCK, 0, fl);
                         dout("got %d on flock_lock_file_wait, undid lock", err);
                 }
-        } else if (err == -ERESTARTSYS) {
-                dout("undoing lock\n");
-                ceph_lock_message(CEPH_LOCK_FLOCK,
-                                  CEPH_MDS_OP_SETFILELOCK,
-                                  file, CEPH_LOCK_UNLOCK, 0, fl);
         }
         return err;
 }
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index a92d3f5c6c12..5a47ed760e6d 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2208,6 +2208,8 @@ int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
                         &req->r_completion, req->r_timeout);
                 if (err == 0)
                         err = -EIO;
+        } else if (req->r_wait_for_completion) {
+                err = req->r_wait_for_completion(mdsc, req);
         } else {
                 err = wait_for_completion_killable(&req->r_completion);
         }
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index 3288359353e9..230bda791d4f 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -166,6 +166,11 @@ struct ceph_mds_client;
  */
 typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
                                              struct ceph_mds_request *req);
+/*
+ * wait for request completion callback
+ */
+typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc,
+                                                 struct ceph_mds_request *req);
 
 /*
  * an in-flight mds request
@@ -239,6 +244,7 @@ struct ceph_mds_request {
         struct completion r_completion;
         struct completion r_safe_completion;
         ceph_mds_request_callback_t r_callback;
+        ceph_mds_request_wait_callback_t r_wait_for_completion;
         struct list_head  r_unsafe_item;  /* per-session unsafe list item */
         bool              r_got_unsafe, r_got_safe, r_got_result;