v4.19.13 snapshot.
diff --git a/fs/ocfs2/export.c b/fs/ocfs2/export.c
new file mode 100644
index 0000000..4bf8d58
--- /dev/null
+++ b/fs/ocfs2/export.c
@@ -0,0 +1,271 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * export.c
+ *
+ * Functions to facilitate NFS exporting
+ *
+ * Copyright (C) 2002, 2005 Oracle. All rights reserved.
+ *
+ * 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 of the License, 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., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/fs.h>
+#include <linux/types.h>
+
+#include <cluster/masklog.h>
+
+#include "ocfs2.h"
+
+#include "alloc.h"
+#include "dir.h"
+#include "dlmglue.h"
+#include "dcache.h"
+#include "export.h"
+#include "inode.h"
+
+#include "buffer_head_io.h"
+#include "suballoc.h"
+#include "ocfs2_trace.h"
+
+struct ocfs2_inode_handle
+{
+ u64 ih_blkno;
+ u32 ih_generation;
+};
+
+static struct dentry *ocfs2_get_dentry(struct super_block *sb,
+ struct ocfs2_inode_handle *handle)
+{
+ struct inode *inode;
+ struct ocfs2_super *osb = OCFS2_SB(sb);
+ u64 blkno = handle->ih_blkno;
+ int status, set;
+ struct dentry *result;
+
+ trace_ocfs2_get_dentry_begin(sb, handle, (unsigned long long)blkno);
+
+ if (blkno == 0) {
+ result = ERR_PTR(-ESTALE);
+ goto bail;
+ }
+
+ inode = ocfs2_ilookup(sb, blkno);
+ /*
+ * If the inode exists in memory, we only need to check it's
+ * generation number
+ */
+ if (inode)
+ goto check_gen;
+
+ /*
+ * This will synchronize us against ocfs2_delete_inode() on
+ * all nodes
+ */
+ status = ocfs2_nfs_sync_lock(osb, 1);
+ if (status < 0) {
+ mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status);
+ goto check_err;
+ }
+
+ status = ocfs2_test_inode_bit(osb, blkno, &set);
+ if (status < 0) {
+ if (status == -EINVAL) {
+ /*
+ * The blkno NFS gave us doesn't even show up
+ * as an inode, we return -ESTALE to be
+ * nice
+ */
+ status = -ESTALE;
+ } else
+ mlog(ML_ERROR, "test inode bit failed %d\n", status);
+ goto unlock_nfs_sync;
+ }
+
+ trace_ocfs2_get_dentry_test_bit(status, set);
+ /* If the inode allocator bit is clear, this inode must be stale */
+ if (!set) {
+ status = -ESTALE;
+ goto unlock_nfs_sync;
+ }
+
+ inode = ocfs2_iget(osb, blkno, 0, 0);
+
+unlock_nfs_sync:
+ ocfs2_nfs_sync_unlock(osb, 1);
+
+check_err:
+ if (status < 0) {
+ if (status == -ESTALE) {
+ trace_ocfs2_get_dentry_stale((unsigned long long)blkno,
+ handle->ih_generation);
+ }
+ result = ERR_PTR(status);
+ goto bail;
+ }
+
+ if (IS_ERR(inode)) {
+ mlog_errno(PTR_ERR(inode));
+ result = ERR_CAST(inode);
+ goto bail;
+ }
+
+check_gen:
+ if (handle->ih_generation != inode->i_generation) {
+ trace_ocfs2_get_dentry_generation((unsigned long long)blkno,
+ handle->ih_generation,
+ inode->i_generation);
+ iput(inode);
+ result = ERR_PTR(-ESTALE);
+ goto bail;
+ }
+
+ result = d_obtain_alias(inode);
+ if (IS_ERR(result))
+ mlog_errno(PTR_ERR(result));
+
+bail:
+ trace_ocfs2_get_dentry_end(result);
+ return result;
+}
+
+static struct dentry *ocfs2_get_parent(struct dentry *child)
+{
+ int status;
+ u64 blkno;
+ struct dentry *parent;
+ struct inode *dir = d_inode(child);
+
+ trace_ocfs2_get_parent(child, child->d_name.len, child->d_name.name,
+ (unsigned long long)OCFS2_I(dir)->ip_blkno);
+
+ status = ocfs2_inode_lock(dir, NULL, 0);
+ if (status < 0) {
+ if (status != -ENOENT)
+ mlog_errno(status);
+ parent = ERR_PTR(status);
+ goto bail;
+ }
+
+ status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno);
+ if (status < 0) {
+ parent = ERR_PTR(-ENOENT);
+ goto bail_unlock;
+ }
+
+ parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0));
+
+bail_unlock:
+ ocfs2_inode_unlock(dir, 0);
+
+bail:
+ trace_ocfs2_get_parent_end(parent);
+
+ return parent;
+}
+
+static int ocfs2_encode_fh(struct inode *inode, u32 *fh_in, int *max_len,
+ struct inode *parent)
+{
+ int len = *max_len;
+ int type = 1;
+ u64 blkno;
+ u32 generation;
+ __le32 *fh = (__force __le32 *) fh_in;
+
+#ifdef TRACE_HOOKS_ARE_NOT_BRAINDEAD_IN_YOUR_OPINION
+#error "You go ahead and fix that mess, then. Somehow"
+ trace_ocfs2_encode_fh_begin(dentry, dentry->d_name.len,
+ dentry->d_name.name,
+ fh, len, connectable);
+#endif
+
+ if (parent && (len < 6)) {
+ *max_len = 6;
+ type = FILEID_INVALID;
+ goto bail;
+ } else if (len < 3) {
+ *max_len = 3;
+ type = FILEID_INVALID;
+ goto bail;
+ }
+
+ blkno = OCFS2_I(inode)->ip_blkno;
+ generation = inode->i_generation;
+
+ trace_ocfs2_encode_fh_self((unsigned long long)blkno, generation);
+
+ len = 3;
+ fh[0] = cpu_to_le32((u32)(blkno >> 32));
+ fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff));
+ fh[2] = cpu_to_le32(generation);
+
+ if (parent) {
+ blkno = OCFS2_I(parent)->ip_blkno;
+ generation = parent->i_generation;
+
+ fh[3] = cpu_to_le32((u32)(blkno >> 32));
+ fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff));
+ fh[5] = cpu_to_le32(generation);
+
+ len = 6;
+ type = 2;
+
+ trace_ocfs2_encode_fh_parent((unsigned long long)blkno,
+ generation);
+ }
+
+ *max_len = len;
+
+bail:
+ trace_ocfs2_encode_fh_type(type);
+ return type;
+}
+
+static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb,
+ struct fid *fid, int fh_len, int fh_type)
+{
+ struct ocfs2_inode_handle handle;
+
+ if (fh_len < 3 || fh_type > 2)
+ return NULL;
+
+ handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32;
+ handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]);
+ handle.ih_generation = le32_to_cpu(fid->raw[2]);
+ return ocfs2_get_dentry(sb, &handle);
+}
+
+static struct dentry *ocfs2_fh_to_parent(struct super_block *sb,
+ struct fid *fid, int fh_len, int fh_type)
+{
+ struct ocfs2_inode_handle parent;
+
+ if (fh_type != 2 || fh_len < 6)
+ return NULL;
+
+ parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32;
+ parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]);
+ parent.ih_generation = le32_to_cpu(fid->raw[5]);
+ return ocfs2_get_dentry(sb, &parent);
+}
+
+const struct export_operations ocfs2_export_ops = {
+ .encode_fh = ocfs2_encode_fh,
+ .fh_to_dentry = ocfs2_fh_to_dentry,
+ .fh_to_parent = ocfs2_fh_to_parent,
+ .get_parent = ocfs2_get_parent,
+};