Initial revision

1 files changed, 78 insertions, 0 deletions

diff --git a/libdiskfs/lookup.c b/libdiskfs/lookup.c
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+/* Wrapper for diskfs_lookup_hard
+   Copyright (C) 1996 Free Software Foundation, Inc.
+   Written by Michael I. Bushnell, p/BSG.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd 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.
+
+   The GNU Hurd 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., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */
+
+#include "priv.h"
+
+/* Lookup in directory DP (which is locked) the name NAME.  TYPE will
+   either be LOOKUP, CREATE, RENAME, or REMOVE.  CRED identifies the
+   user making the call.
+
+   If the name is found, return zero, and (if NP is nonzero) set *NP
+   to point to the node for it, locked.  If the name is not found,
+   return ENOENT, and (if NP is nonzero) set *NP to zero.  If NP is
+   zero, then the node found must not be locked, even transitorily.
+   Lookups for REMOVE and RENAME (which must often check permissions
+   on the node being found) will always set NP.
+
+   If DS is nonzero then:
+     For LOOKUP: set *DS to be ignored by diskfs_drop_dirstat.
+     For CREATE: on success, set *DS to be ignored by diskfs_drop_dirstat.
+                 on failure, set *DS for a future call to diskfs_direnter.
+     For RENAME: on success, set *DS for a future call to diskfs_dirrewrite.
+                 on failure, set *DS for a future call to diskfs_direnter.
+     For REMOVE: on success, set *DS for a future call to diskfs_dirremove.
+                 on failure, set *DS to be ignored by diskfs_drop_dirstat.
+   The caller of this function guarantees that if DS is nonzero, then
+   either the appropriate call listed above or diskfs_drop_dirstat will
+   be called with DS before the directory DP is unlocked, and guarantees
+   that no lookup calls will be made on this directory between this
+   lookup and the use (or descruction) of *DS.
+
+   If you use the library's versions of diskfs_rename_dir,
+   diskfs_clear_directory, and diskfs_init_dir, then lookups for `..'
+   might have the flag SPEC_DOTDOT or'd in.  This has the following special
+   meaning:
+   For LOOKUP: DP should be unlocked and its reference dropped before
+               returning.
+   For RENAME and REMOVE: The node being found (*NP) is already held
+               locked, so don't lock it or add a reference to it.
+   (SPEC_DOTDOT will not be given with CREATE.)
+
+   Return ENOTDIR if DP is not a directory.
+   Return EACCES if CRED isn't allowed to search DP.
+   Return EACCES if completing the operation will require writing
+   the directory and diskfs_checkdirmod won't allow the modification.
+   Return ENOENT if NAME isn't in the directory.
+   Return EAGAIN if NAME refers to the `..' of this filesystem's root.
+   Return EIO if appropriate.
+   
+   This function is a wrapper for diskfs_lookup_hard. 
+*/
+error_t 
+diskfs_lookup (struct node *dp, 
+	       char *name,
+	       enum lookup_type type,
+	       struct node **np,
+	       struct dirstat *ds,
+	       struct protid *cred)
+{
+  return diskfs_lookup_hard (dp, name, type, np, ds, cred);
+}
+