patch-2.2.11 linux/fs/efs/namei.c

• Lines: 76
• Date: Mon Aug 9 12:04:41 1999
• Orig file: v2.2.10/linux/fs/efs/namei.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.2.10/linux/fs/efs/namei.c linux/fs/efs/namei.c
@@ -0,0 +1,75 @@
+/*
+ * namei.c
+ *
+ * Copyright (c) 1999 Al Smith
+ *
+ * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
+ */
+
+#include <linux/efs_fs.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 = bread(inode->i_dev, efs_bmap(inode, block), EFS_DIRBSIZE);
+		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) {
+	efs_ino_t inodenum;
+	struct inode * inode;
+
+	if (!dir || !S_ISDIR(dir->i_mode))
+		return ERR_PTR(-ENOENT);
+
+	inode = NULL;
+
+	inodenum = efs_find_entry(dir, dentry->d_name.name, dentry->d_name.len);
+	if (inodenum) {
+		if (!(inode = iget(dir->i_sb, inodenum)))
+			return ERR_PTR(-EACCES);
+	}
+
+	d_add(dentry, inode);
+	return NULL;
+}
+