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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>
This commit is contained in:
Kinglong Mee 2014-08-22 10:18:43 -04:00 committed by Jeff Layton
parent 5c97d7b147
commit f328296e27
2 changed files with 17 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fs/lockd/svclock.c
View File

@ -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)

36
fs/locks.c
View File

@ -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;
}