This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / fs / gfs2 / ops_dentry.c

diff --git a/fs/gfs2/ops_dentry.c b/fs/gfs2/ops_dentry.c
new file mode 100644 (file)
index 0000000..c6bac6b
--- /dev/null
+++ b/fs/gfs2/ops_dentry.c
@@ -0,0 +1,124 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License version 2.
+ */
+
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/smp_lock.h>
+#include <linux/gfs2_ondisk.h>
+#include <linux/crc32.h>
+#include <linux/lm_interface.h>
+
+#include "gfs2.h"
+#include "incore.h"
+#include "dir.h"
+#include "glock.h"
+#include "ops_dentry.h"
+#include "util.h"
+
+/**
+ * gfs2_drevalidate - Check directory lookup consistency
+ * @dentry: the mapping to check
+ * @nd:
+ *
+ * Check to make sure the lookup necessary to arrive at this inode from its
+ * parent is still good.
+ *
+ * Returns: 1 if the dentry is ok, 0 if it isn't
+ */
+
+static int gfs2_drevalidate(struct dentry *dentry, struct nameidata *nd)
+{
+       struct dentry *parent = dget_parent(dentry);
+       struct gfs2_sbd *sdp = GFS2_SB(parent->d_inode);
+       struct gfs2_inode *dip = GFS2_I(parent->d_inode);
+       struct inode *inode = dentry->d_inode;
+       struct gfs2_holder d_gh;
+       struct gfs2_inode *ip;
+       struct gfs2_inum_host inum;
+       unsigned int type;
+       int error;
+       int had_lock=0;
+
+       if (inode && is_bad_inode(inode))
+               goto invalid;
+
+       if (sdp->sd_args.ar_localcaching)
+               goto valid;
+
+       had_lock = gfs2_glock_is_locked_by_me(dip->i_gl);
+       if (!had_lock) {
+               error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
+               if (error)
+                       goto fail;
+       } 
+
+       error = gfs2_dir_search(parent->d_inode, &dentry->d_name, &inum, &type);
+       switch (error) {
+       case 0:
+               if (!inode)
+                       goto invalid_gunlock;
+               break;
+       case -ENOENT:
+               if (!inode)
+                       goto valid_gunlock;
+               goto invalid_gunlock;
+       default:
+               goto fail_gunlock;
+       }
+
+       ip = GFS2_I(inode);
+
+       if (!gfs2_inum_equal(&ip->i_num, &inum))
+               goto invalid_gunlock;
+
+       if (IF2DT(ip->i_inode.i_mode) != type) {
+               gfs2_consist_inode(dip);
+               goto fail_gunlock;
+       }
+
+valid_gunlock:
+       if (!had_lock)
+               gfs2_glock_dq_uninit(&d_gh);
+valid:
+       dput(parent);
+       return 1;
+
+invalid_gunlock:
+       if (!had_lock)
+               gfs2_glock_dq_uninit(&d_gh);
+invalid:
+       if (inode && S_ISDIR(inode->i_mode)) {
+               if (have_submounts(dentry))
+                       goto valid;
+               shrink_dcache_parent(dentry);
+       }
+       d_drop(dentry);
+       dput(parent);
+       return 0;
+
+fail_gunlock:
+       gfs2_glock_dq_uninit(&d_gh);
+fail:
+       dput(parent);
+       return 0;
+}
+
+static int gfs2_dhash(struct dentry *dentry, struct qstr *str)
+{
+       str->hash = gfs2_disk_hash(str->name, str->len);
+       return 0;
+}
+
+struct dentry_operations gfs2_dops = {
+       .d_revalidate = gfs2_drevalidate,
+       .d_hash = gfs2_dhash,
+};
+