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NLM/lockd: Ensure we don't corrupt fl->fl_flags in nlmclnt_unlock()

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Also fix up nlmclnt_lock() so that it doesn't pass modified versions of
fl->fl_flags to nlmclnt_cancel() and other helpers.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2008-04-01 18:57:06 -04:00
parent 1e799b673c
commit 4a9af59fee
1 changed files with 10 additions and 6 deletions
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16
fs/lockd/clntproc.c
View file

@ -493,6 +493,7 @@ nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl)
}
fl->fl_flags |= FL_ACCESS;
status = do_vfs_lock(fl);
fl->fl_flags = fl_flags;
if (status < 0)
goto out;
@ -530,10 +531,11 @@ again:
goto again;
}
/* Ensure the resulting lock will get added to granted list */
fl->fl_flags = fl_flags | FL_SLEEP;
fl->fl_flags |= FL_SLEEP;
if (do_vfs_lock(fl) < 0)
printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
up_read(&host->h_rwsem);
fl->fl_flags = fl_flags;
}
status = nlm_stat_to_errno(resp->status);
out_unblock:
@ -543,7 +545,6 @@ out_unblock:
nlmclnt_cancel(host, req->a_args.block, fl);
out:
nlm_release_call(req);
fl->fl_flags = fl_flags;
return status;
}
@ -598,7 +599,8 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
{
struct nlm_host *host = req->a_host;
struct nlm_res *resp = &req->a_res;
int status = 0;
int status;
unsigned char fl_flags = fl->fl_flags;
/*
* Note: the server is supposed to either grant us the unlock
@ -607,11 +609,13 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
*/
fl->fl_flags |= FL_EXISTS;
down_read(&host->h_rwsem);
if (do_vfs_lock(fl) == -ENOENT) {
up_read(&host->h_rwsem);
status = do_vfs_lock(fl);
up_read(&host->h_rwsem);
fl->fl_flags = fl_flags;
if (status == -ENOENT) {
status = 0;
goto out;
}
up_read(&host->h_rwsem);
if (req->a_flags & RPC_TASK_ASYNC)
return nlm_async_call(req, NLMPROC_UNLOCK, &nlmclnt_unlock_ops);