libdiskfs: Support for file record locking

2019-03-04  Svante Signell <svante.signell@gmail.com>

        * file-lock.c: Make flock work regardless of the
          mode in which the file was opened.

2019-02-12  Svante Signell <svante.signell@gmail.com>

        * file-lock.c: Comment out "Make flock work without R or W mode"

2019-02-01  Svante Signell <svante.signell@gmail.com>

        * Update copyright years.
        * file-record-lock.c(diskfs_S_file_record_lock):
          Don't set rendezvous to MACH_PORT_NULL.

2018-12-07  Svante Signell <svante.signell@gmail.com>

        * Update copyright years.
        * dir-lookup.c(diskfs_S_dir_lookup): Call fshelp_rlock_tweak()
          with new last argument rendezvous = MACH_PORT_NULL.
        * file-lock.c(diskfs_S_file_lock): Likewise.
        * file-record-lock.c(diskfs_S_file_record_lock): Likewise.
        (diskfs_S_file_record_lock): Add new argument mach_port_t rendezvous.

2017-01-05  Svante Signell <svante.signell@gmail.com>

        * Update copyright years and headers.

2016-05-23  Svante Signell <svante.signell@gmail.com>

        * file-lock-stat.c: Port from cthreads to libpthread.
        * file-lock.c: Likewise.
        * file-record-lock: Likewise.

2001-04-11  Neal H Walfield  <neal@cs.uml.edu>

        * Makefile (FSSRCS): Add file-record-lock.c.
        * diskfs.h (struct peropen): Change the type of lock_status
        from an int to a struct rlock_peropen.
        (struct node): Change the type of userbox from a struct lock_box
        to a struct rlock_box.
        * dir-lookup.c (diskfs_S_dir_lookup): Use fshelp_rlock_tweak
        as fshelp_acquire_lock is now depreciated.
        * file-lock-stat.c (diskfs_S_file_lock_stat): Total rewrite
        around the new record locking functions.
        * file-lock.c (diskfs_S_file_lock): Total rewrite around the
        new record locking functions.
        * file-record-lock.c: New file.  Implement
        diskfs_S_file_record_lock.
        * node-make.c (diskfs_make_node):  Initialize userbox with
        fshelp_rlock_init.
        * peropen-make.c (diskfs_make_peropen): Initialize lock_status
        using fshelp_rlock_po_init.
        * peropen-rele.c (diskfs_release_peropen): Release lock_status
        using fshelp_rlock_drop_peropen.

1 files changed, 45 insertions, 0 deletions

diff --git a/libdiskfs/file-record-lock.c b/libdiskfs/file-record-lock.c
new file mode 100644
index 00000000..a3ce9f42
--- /dev/null
+++ b/libdiskfs/file-record-lock.c
@@ -0,0 +1,45 @@
+/* Copyright (C) 2001, 2014-2019 Free Software Foundation, Inc.
+
+   Written by Neal H Walfield <neal@cs.uml.edu>
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with the GNU Hurd.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "priv.h"
+#include "diskfs.h"
+#include "fs_S.h"
+
+#include <errno.h>
+#include <hurd/fshelp.h>
+
+error_t
+diskfs_S_file_record_lock (struct protid *cred,
+			   int cmd,
+			   struct flock64 *lock,
+			   mach_port_t rendezvous)
+{
+  struct node *node;
+  error_t err;
+
+  if (! cred)
+    return EOPNOTSUPP;
+
+  node = cred->po->np;
+  pthread_mutex_lock (&node->lock);
+  err = fshelp_rlock_tweak (&node->userlock, &node->lock,
+			    &cred->po->lock_status, cred->po->openstat,
+			    node->dn_stat.st_size, cred->po->filepointer,
+			    cmd, lock, rendezvous);
+  pthread_mutex_unlock (&node->lock);
+  return err;
+}