[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/fs/gfs2/dentry.c b/src/kernel/linux/v4.14/fs/gfs2/dentry.c
new file mode 100644
index 0000000..5173b98
--- /dev/null
+++ b/src/kernel/linux/v4.14/fs/gfs2/dentry.c
@@ -0,0 +1,134 @@
+/*
+ * 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/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/gfs2_ondisk.h>
+#include <linux/namei.h>
+#include <linux/crc32.h>
+
+#include "gfs2.h"
+#include "incore.h"
+#include "dir.h"
+#include "glock.h"
+#include "super.h"
+#include "util.h"
+#include "inode.h"
+
+/**
+ * gfs2_drevalidate - Check directory lookup consistency
+ * @dentry: the mapping to check
+ * @flags: lookup flags
+ *
+ * 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, unsigned int flags)
+{
+ struct dentry *parent;
+ struct gfs2_sbd *sdp;
+ struct gfs2_inode *dip;
+ struct inode *inode;
+ struct gfs2_holder d_gh;
+ struct gfs2_inode *ip = NULL;
+ int error;
+ int had_lock = 0;
+
+ if (flags & LOOKUP_RCU)
+ return -ECHILD;
+
+ parent = dget_parent(dentry);
+ sdp = GFS2_SB(d_inode(parent));
+ dip = GFS2_I(d_inode(parent));
+ inode = d_inode(dentry);
+
+ if (inode) {
+ if (is_bad_inode(inode))
+ goto invalid;
+ ip = GFS2_I(inode);
+ }
+
+ if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
+ goto valid;
+
+ had_lock = (gfs2_glock_is_locked_by_me(dip->i_gl) != NULL);
+ if (!had_lock) {
+ error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
+ if (error)
+ goto fail;
+ }
+
+ error = gfs2_dir_check(d_inode(parent), &dentry->d_name, ip);
+ switch (error) {
+ case 0:
+ if (!inode)
+ goto invalid_gunlock;
+ break;
+ case -ENOENT:
+ if (!inode)
+ goto valid_gunlock;
+ goto invalid_gunlock;
+ default:
+ 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:
+ dput(parent);
+ return 0;
+
+fail_gunlock:
+ gfs2_glock_dq_uninit(&d_gh);
+fail:
+ dput(parent);
+ return 0;
+}
+
+static int gfs2_dhash(const struct dentry *dentry, struct qstr *str)
+{
+ str->hash = gfs2_disk_hash(str->name, str->len);
+ return 0;
+}
+
+static int gfs2_dentry_delete(const struct dentry *dentry)
+{
+ struct gfs2_inode *ginode;
+
+ if (d_really_is_negative(dentry))
+ return 0;
+
+ ginode = GFS2_I(d_inode(dentry));
+ if (!gfs2_holder_initialized(&ginode->i_iopen_gh))
+ return 0;
+
+ if (test_bit(GLF_DEMOTE, &ginode->i_iopen_gh.gh_gl->gl_flags))
+ return 1;
+
+ return 0;
+}
+
+const struct dentry_operations gfs2_dops = {
+ .d_revalidate = gfs2_drevalidate,
+ .d_hash = gfs2_dhash,
+ .d_delete = gfs2_dentry_delete,
+};
+