1 files changed, 94 insertions, 0 deletions
diff --git a/libdiskfs/io-write.c b/libdiskfs/io-write.c
new file mode 100644
index 00000000..adbfc6d5
--- /dev/null
+++ b/libdiskfs/io-write.c
@@ -0,0 +1,94 @@
+/*
+   Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
+
+   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 this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "priv.h"
+#include "io_S.h"
+#include <fcntl.h>
+
+/* Implement io_write as described in <hurd/io.defs>. */
+kern_return_t
+diskfs_S_io_write (struct protid *cred,
+		   char *data,
+		   mach_msg_type_number_t datalen,
+		   off_t offset,
+		   mach_msg_type_number_t *amt)
+{
+  struct node *np;
+  error_t err;
+  int off = offset;
+
+  if (!cred)
+    return EOPNOTSUPP;
+
+  np = cred->po->np;
+  if (!(cred->po->openstat & O_WRITE))
+    return EBADF;
+
+  mutex_lock (&np->lock);
+
+  assert (!S_ISDIR(np->dn_stat.st_mode));
+
+  iohelp_get_conch (&np->conch);
+
+  if (off == -1)
+    {
+      if (cred->po->openstat & O_APPEND)
+	cred->po->filepointer = np->dn_stat.st_size;
+      off = cred->po->filepointer;
+    }
+  if (off < 0)
+    {
+      err = EINVAL;
+      goto out;
+    }
+
+  err = 0;
+  while (off + (off_t) datalen > np->allocsize)
+    {
+      err = diskfs_grow (np, off + datalen, cred);
+      if (diskfs_synchronous)
+	diskfs_node_update (np, 1);
+      if (err)
+	goto out;
+      if (np->filemod_reqs)
+	diskfs_notice_filechange (np, FILE_CHANGED_EXTEND, 0, off + datalen);
+    }
+
+  if (off + (off_t) datalen > np->dn_stat.st_size)
+    {
+      np->dn_stat.st_size = off + datalen;
+      np->dn_set_ctime = 1;
+      if (diskfs_synchronous)
+	diskfs_node_update (np, 1);
+    }
+
+  *amt = datalen;
+  err = _diskfs_rdwr_internal (np, data, off, amt, 1, 0);
+
+  if (!err && offset == -1)
+    cred->po->filepointer += *amt;
+
+  if (!err
+      && ((cred->po->openstat & O_FSYNC) || diskfs_synchronous))
+    diskfs_file_update (np, 1);
+
+  if (!err && np->filemod_reqs)
+    diskfs_notice_filechange (np, FILE_CHANGED_WRITE, off, off + *amt);
+ out:
+  mutex_unlock (&np->lock);
+  return err;
+}