Initial revision

4 files changed, 223 insertions, 0 deletions

diff --git a/libdiskfs/conch-fetch.c b/libdiskfs/conch-fetch.c
new file mode 100644
index 00000000..17719bd3
--- /dev/null
+++ b/libdiskfs/conch-fetch.c
@@ -0,0 +1,49 @@
+/* 
+   Copyright (C) 1994 Free Software Foundation
+
+   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"
+
+/* Update our copy of the relevant fields from a shared page.  Callers
+   must have the share lock on the shared page as well as the inode
+   toplock.  This is called by the conch management facilities of 
+   libioserver as well as by us.  */
+void
+ioserver_fetch_shared_data (void *arg)
+{
+  struct protid *cred = arg;
+  
+  if (cred->mapped->file_size < cred->po->np->dn_stat.st_size)
+    cred->mapped->file_size = cred->po->np->dn_stat.st_size;
+  else if (cred->po->np->dn_stat.st_size != cred->mapped->file_size
+	   && !readonly)
+    {
+      cred->po->np->dn_stat.st_size = cred->mapped->file_size;
+      cred->po->np->dn_set_ctime = 1;
+    }
+      
+  cred->po->filepointer = cred->mapped->xx_file_pointer;
+      
+  if (!readonly)
+    {
+      if (cred->mapped->written)
+	cred->po->ip->dn_set_mtime = 1;
+      if (cred->mapped->accessed)
+	cred->po->ip->dn_set_atime = 1;
+    }
+  cred->mapped->written = 0;
+  cred->mapped->accessed = 0;
+}
diff --git a/libdiskfs/conch-set.c b/libdiskfs/conch-set.c
new file mode 100644
index 00000000..4c58c071
--- /dev/null
+++ b/libdiskfs/conch-set.c
@@ -0,0 +1,52 @@
+/* 
+   Copyright (C) 1994 Free Software Foundation
+
+   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"
+
+/* Write current values into the shared page.  Callers must have the
+   share lock on the shared page, as well as the inode toplock.
+   This is called by the conch management facilities of libioserver
+   as well as by us. */
+error_t
+ioserver_put_shared_data (void *arg)
+{
+  struct protid *cred = arg;
+  error_t error;
+  
+  if (!(error = catch_exception ()))
+    {
+      cred->mapped->append_mode = (cred->po->openstat & O_APPEND);
+      cred->mapped->eof_notify = 0;
+      cred->mapped->do_sigio = 0;
+      cred->mapped->use_file_size = 1;
+      cred->mapped->use_read_size = 0;
+      cred->mapped->seekable = 1;
+      cred->mapped->use_prenotify_size = 1;
+      cred->mapped->use_postnotify_size = 0;
+      cred->mapped->prenotify_size = cred->po->ip->i_allocsize;
+      
+      cred->mapped->xx_file_pointer = cred->po->filepointer;
+      cred->mapped->rd_file_pointer = -1;
+      cred->mapped->wr_file_pointer = -1;
+      cred->mapped->file_size = cred->po->ip->di->di_size;
+      cred->mapped->written = 0;
+      cred->mapped->accessed = 0;
+      
+      end_catch_exception ();
+    }
+  return error;
+}
diff --git a/libdiskfs/io-prenotify.c b/libdiskfs/io-prenotify.c
new file mode 100644
index 00000000..fc6048ec
--- /dev/null
+++ b/libdiskfs/io-prenotify.c
@@ -0,0 +1,68 @@
+/* 
+   Copyright (C) 1994 Free Software Foundation
+
+   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"
+
+/* Implement io_prenotify as described in <hurd/io.defs>. 
+
+   We set the prenotify size to be the allocated size of the file;
+   then users are forced to call this routine before writing past
+   that, and we can do allocation (orreturn ENOSPC if necessary. */
+error_t
+diskfs_S_io_prenotify (struct protid *cred,
+		       int start,
+		       int end)
+{
+  struct node *np;
+  int err = 0;
+  
+  if (!cred)
+    return EOPNOTSUPP;
+  
+  np = cred->po->np;
+
+  /* Clamp it down */
+  mutex_lock (&np->lock);
+
+  if (!cred->mapped)
+    {
+      err = EINVAL;
+      goto out;
+    }
+
+  err = ioserver_verify_user_conch (&np->conch, cred);
+  if (err)
+    goto out;
+  
+  ioserver_fetch_shared_data (cred);
+  
+  if (end < np->allocsize)
+    {
+      /* The user is either foolin' with us, or has the wrong
+	 prenotify size, hence the diagnostic. */
+      printf ("io_prenotify: unnecessary call\n");
+      spin_lock (&cred->mapped->lock);
+      err = ioserver_put_shared_data (cred);
+      spin_unlock (&cred->mapped->lock);
+      goto out;
+    }
+  
+  err =  file_extend (np, end, cred);
+ out:
+  mutex_unlock (&np->i_toplock);
+  return err;
+}
diff --git a/libdiskfs/io-stubs.c b/libdiskfs/io-stubs.c
new file mode 100644
index 00000000..debb0fed
--- /dev/null
+++ b/libdiskfs/io-stubs.c
@@ -0,0 +1,54 @@
+/* 
+   Copyright (C) 1994 Free Software Foundation
+
+   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"
+
+/* Unimplemented stubs. */
+
+/* Implement io_readsleep as described in <hurd/io.defs>
+   Semantics of ordinary files say this shouldn't happen, because
+   we never set use_read_size in the shared data. */
+error_t
+S_io_readsleep (struct protid *cred)
+{
+  if (!cred)
+    return EOPNOTSUPP;
+  
+  return 0;
+}
+
+/* Implement io_eofnotify as described in <hurd/io.defs>. 
+   We don't use this feature. */
+error_t
+S_io_eofnotify (struct protid *cred)
+{
+  if (!cred)
+    return EOPNOTSUPP;
+  
+  return 0;
+}
+
+/* Implement io_sigio as described in <hurd/io.defs>. 
+   We do this (in theory) but async IO is implemented here yet. */
+error_t
+S_io_sigio (struct protid *cred)
+{
+  if (!cred)
+    return EOPNOTSUPP;
+  
+  return 0;
+}