[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/fs/efs/namei.c b/src/kernel/linux/v4.14/fs/efs/namei.c
new file mode 100644
index 0000000..38961ee
--- /dev/null
+++ b/src/kernel/linux/v4.14/fs/efs/namei.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * namei.c
+ *
+ * Copyright (c) 1999 Al Smith
+ *
+ * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
+ */
+
+#include <linux/buffer_head.h>
+#include <linux/string.h>
+#include <linux/exportfs.h>
+#include "efs.h"
+
+
+static efs_ino_t efs_find_entry(struct inode *inode, const char *name, int len)
+{
+ struct buffer_head *bh;
+
+ int slot, namelen;
+ char *nameptr;
+ struct efs_dir *dirblock;
+ struct efs_dentry *dirslot;
+ efs_ino_t inodenum;
+ efs_block_t block;
+
+ if (inode->i_size & (EFS_DIRBSIZE-1))
+ pr_warn("%s(): directory size not a multiple of EFS_DIRBSIZE\n",
+ __func__);
+
+ for(block = 0; block < inode->i_blocks; block++) {
+
+ bh = sb_bread(inode->i_sb, efs_bmap(inode, block));
+ if (!bh) {
+ pr_err("%s(): failed to read dir block %d\n",
+ __func__, block);
+ return 0;
+ }
+
+ dirblock = (struct efs_dir *) bh->b_data;
+
+ if (be16_to_cpu(dirblock->magic) != EFS_DIRBLK_MAGIC) {
+ pr_err("%s(): invalid directory block\n", __func__);
+ brelse(bh);
+ return 0;
+ }
+
+ for (slot = 0; slot < dirblock->slots; slot++) {
+ dirslot = (struct efs_dentry *) (((char *) bh->b_data) + EFS_SLOTAT(dirblock, slot));
+
+ namelen = dirslot->namelen;
+ nameptr = dirslot->name;
+
+ if ((namelen == len) && (!memcmp(name, nameptr, len))) {
+ inodenum = be32_to_cpu(dirslot->inode);
+ brelse(bh);
+ return inodenum;
+ }
+ }
+ brelse(bh);
+ }
+ return 0;
+}
+
+struct dentry *efs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
+{
+ efs_ino_t inodenum;
+ struct inode *inode = NULL;
+
+ inodenum = efs_find_entry(dir, dentry->d_name.name, dentry->d_name.len);
+ if (inodenum)
+ inode = efs_iget(dir->i_sb, inodenum);
+
+ return d_splice_alias(inode, dentry);
+}
+
+static struct inode *efs_nfs_get_inode(struct super_block *sb, u64 ino,
+ u32 generation)
+{
+ struct inode *inode;
+
+ if (ino == 0)
+ return ERR_PTR(-ESTALE);
+ inode = efs_iget(sb, ino);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+
+ if (generation && inode->i_generation != generation) {
+ iput(inode);
+ return ERR_PTR(-ESTALE);
+ }
+
+ return inode;
+}
+
+struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid,
+ int fh_len, int fh_type)
+{
+ return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+ efs_nfs_get_inode);
+}
+
+struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid,
+ int fh_len, int fh_type)
+{
+ return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+ efs_nfs_get_inode);
+}
+
+struct dentry *efs_get_parent(struct dentry *child)
+{
+ struct dentry *parent = ERR_PTR(-ENOENT);
+ efs_ino_t ino;
+
+ ino = efs_find_entry(d_inode(child), "..", 2);
+ if (ino)
+ parent = d_obtain_alias(efs_iget(child->d_sb, ino));
+
+ return parent;
+}