locks: Copy fl_lmops information for conflock in locks_copy_conflock()

Commit d5b9026a67 ([PATCH] knfsd: locks: flag NFSv4-owned locks) using
fl_lmops field in file_lock for checking nfsd4 lockowner.

But, commit 1a747ee0cc (locks: don't call ->copy_lock methods on return
of conflicting locks) causes the fl_lmops of conflock always be NULL.

Also, commit 0996905f93 (lockd: posix_test_lock() should not call
locks_copy_lock()) caused the fl_lmops of conflock always be NULL too.

Make sure copy the private information by fl_copy_lock() in struct
file_lock_operations, merge __locks_copy_lock() to fl_copy_lock().

Jeff advice, "Set fl_lmops on conflocks, but don't set fl_ops.
fl_ops are superfluous, since they are callbacks into the filesystem.
There should be no need to bother the filesystem at all with info
in a conflock. But, lock _ownership_ matters for conflocks and that's
indicated by the fl_lmops. So you really do want to copy the fl_lmops
for conflocks I think."

v5: add missing calling of locks_release_private() in nlmsvc_testlock()
v4: only copy fl_lmops for conflock, don't copy fl_ops

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>

diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index 2a6170133c1d92ebfd0ea8d24d0682b8d2df9835..acfa94d5b48967ec21f55e52132df850c15ff6bc 100644 (file)
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -586,6 +586,7 @@ conf_lock:
        conflock->fl.fl_type = lock->fl.fl_type;
        conflock->fl.fl_start = lock->fl.fl_start;
        conflock->fl.fl_end = lock->fl.fl_end;
+       locks_release_private(&lock->fl);
        ret = nlm_lck_denied;
 out:
        if (block)

diff --git a/fs/locks.c b/fs/locks.c
index 5e83f3a993775517039e1ad0af596335bac9ccc0..c3991dc80137d8201727ec33d20dd67191dedd18 100644 (file)
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -271,21 +271,6 @@ void locks_init_lock(struct file_lock *fl)
 
 EXPORT_SYMBOL(locks_init_lock);
 
-static void locks_copy_private(struct file_lock *new, struct file_lock *fl)
-{
-       if (fl->fl_ops) {
-               if (fl->fl_ops->fl_copy_lock)
-                       fl->fl_ops->fl_copy_lock(new, fl);
-               new->fl_ops = fl->fl_ops;
-       }
-
-       if (fl->fl_lmops) {
-               if (fl->fl_lmops->lm_get_owner)
-                       fl->fl_lmops->lm_get_owner(new, fl);
-               new->fl_lmops = fl->fl_lmops;
-       }
-}
-
 /*
  * Initialize a new lock from an existing file_lock structure.
  */
@@ -298,8 +283,13 @@ void locks_copy_conflock(struct file_lock *new, struct file_lock *fl)
        new->fl_type = fl->fl_type;
        new->fl_start = fl->fl_start;
        new->fl_end = fl->fl_end;
+       new->fl_lmops = fl->fl_lmops;
        new->fl_ops = NULL;
-       new->fl_lmops = NULL;
+
+       if (fl->fl_lmops) {
+               if (fl->fl_lmops->lm_get_owner)
+                       fl->fl_lmops->lm_get_owner(new, fl);
+       }
 }
 EXPORT_SYMBOL(locks_copy_conflock);
 
@@ -309,11 +299,14 @@ void locks_copy_lock(struct file_lock *new, struct file_lock *fl)
        WARN_ON_ONCE(new->fl_ops);
 
        locks_copy_conflock(new, fl);
+
        new->fl_file = fl->fl_file;
        new->fl_ops = fl->fl_ops;
-       new->fl_lmops = fl->fl_lmops;
 
-       locks_copy_private(new, fl);
+       if (fl->fl_ops) {
+               if (fl->fl_ops->fl_copy_lock)
+                       fl->fl_ops->fl_copy_lock(new, fl);
+       }
 }
 
 EXPORT_SYMBOL(locks_copy_lock);
@@ -1989,11 +1982,13 @@ int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock __user *l)
        if (file_lock.fl_type != F_UNLCK) {
                error = posix_lock_to_flock(&flock, &file_lock);
                if (error)
-                       goto out;
+                       goto rel_priv;
        }
        error = -EFAULT;
        if (!copy_to_user(l, &flock, sizeof(flock)))
                error = 0;
+rel_priv:
+       locks_release_private(&file_lock);
 out:
        return error;
 }
@@ -2214,7 +2209,8 @@ int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 __user *l)
        error = -EFAULT;
        if (!copy_to_user(l, &flock, sizeof(flock)))
                error = 0;
-  
+
+       locks_release_private(&file_lock);
 out:
        return error;
 }