From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
---
 fs/efs/namei.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 fs/efs/namei.c

(limited to 'fs/efs/namei.c')

diff --git a/fs/efs/namei.c b/fs/efs/namei.c
new file mode 100644
index 000000000000..ed4a207fe22a
--- /dev/null
+++ b/fs/efs/namei.c
@@ -0,0 +1,110 @@
+/*
+ * 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/efs_fs.h>
+#include <linux/smp_lock.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))
+		printk(KERN_WARNING "EFS: WARNING: find_entry(): directory size not a multiple of EFS_DIRBSIZE\n");
+
+	for(block = 0; block < inode->i_blocks; block++) {
+
+		bh = sb_bread(inode->i_sb, efs_bmap(inode, block));
+		if (!bh) {
+			printk(KERN_ERR "EFS: find_entry(): failed to read dir block %d\n", block);
+			return 0;
+		}
+    
+		dirblock = (struct efs_dir *) bh->b_data;
+
+		if (be16_to_cpu(dirblock->magic) != EFS_DIRBLK_MAGIC) {
+			printk(KERN_ERR "EFS: find_entry(): invalid directory block\n");
+			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, struct nameidata *nd) {
+	efs_ino_t inodenum;
+	struct inode * inode = NULL;
+
+	lock_kernel();
+	inodenum = efs_find_entry(dir, dentry->d_name.name, dentry->d_name.len);
+	if (inodenum) {
+		if (!(inode = iget(dir->i_sb, inodenum))) {
+			unlock_kernel();
+			return ERR_PTR(-EACCES);
+		}
+	}
+	unlock_kernel();
+
+	d_add(dentry, inode);
+	return NULL;
+}
+
+struct dentry *efs_get_parent(struct dentry *child)
+{
+	struct dentry *parent;
+	struct inode *inode;
+	efs_ino_t ino;
+	int error;
+
+	lock_kernel();
+
+	error = -ENOENT;
+	ino = efs_find_entry(child->d_inode, "..", 2);
+	if (!ino)
+		goto fail;
+
+	error = -EACCES;
+	inode = iget(child->d_inode->i_sb, ino);
+	if (!inode)
+		goto fail;
+
+	error = -ENOMEM;
+	parent = d_alloc_anon(inode);
+	if (!parent)
+		goto fail_iput;
+
+	unlock_kernel();
+	return parent;
+
+ fail_iput:
+	iput(inode);
+ fail:
+	unlock_kernel();
+	return ERR_PTR(error);
+}
-- 
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