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lockd: lockd server-side shouldn't set fl_ops 

[ Upstream commit 7de875b231edb807387a81cde288aa9e1015ef9e ]

Locks have two sets of op arrays, fl_lmops for the lock manager (lockd
or nfsd), fl_ops for the filesystem.  The server-side lockd code has
been setting its own fl_ops, which leads to confusion (and crashes) in
the reexport case, where the filesystem expects to be the only one
setting fl_ops.

And there's no reason for it that I can see-the lm_get/put_owner ops do
the same job.

Reported-by: Daire Byrne <daire@dneg.com>
Tested-by: Daire Byrne <daire@dneg.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
J. Bruce Fields 2021-08-20 17:01:59 -04:00 committed by Greg Kroah-Hartman
parent a18cfd715e
commit 727c973ffe
1 changed files with 12 additions and 18 deletions
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30
fs/lockd/svclock.c
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@ -395,28 +395,10 @@ nlmsvc_release_lockowner(struct nlm_lock *lock)
nlmsvc_put_lockowner(lock->fl.fl_owner);
}
static void nlmsvc_locks_copy_lock(struct file_lock *new, struct file_lock *fl)
{
struct nlm_lockowner *nlm_lo = (struct nlm_lockowner *)fl->fl_owner;
new->fl_owner = nlmsvc_get_lockowner(nlm_lo);
}
static void nlmsvc_locks_release_private(struct file_lock *fl)
{
nlmsvc_put_lockowner((struct nlm_lockowner *)fl->fl_owner);
}
static const struct file_lock_operations nlmsvc_lock_ops = {
.fl_copy_lock = nlmsvc_locks_copy_lock,
.fl_release_private = nlmsvc_locks_release_private,
};
void nlmsvc_locks_init_private(struct file_lock *fl, struct nlm_host *host,
pid_t pid)
{
fl->fl_owner = nlmsvc_find_lockowner(host, pid);
if (fl->fl_owner != NULL)
fl->fl_ops = &nlmsvc_lock_ops;
}
/*
@ -788,9 +770,21 @@ nlmsvc_notify_blocked(struct file_lock *fl)
printk(KERN_WARNING "lockd: notification for unknown block!\n");
}
static fl_owner_t nlmsvc_get_owner(fl_owner_t owner)
{
return nlmsvc_get_lockowner(owner);
}
static void nlmsvc_put_owner(fl_owner_t owner)
{
nlmsvc_put_lockowner(owner);
}
const struct lock_manager_operations nlmsvc_lock_operations = {
.lm_notify = nlmsvc_notify_blocked,
.lm_grant = nlmsvc_grant_deferred,
.lm_get_owner = nlmsvc_get_owner,
.lm_put_owner = nlmsvc_put_owner,
};
/*