4 * Copyright (c) 1999 Al Smith
6 * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
9 #include <linux/buffer_head.h>
10 #include <linux/string.h>
11 #include <linux/exportfs.h>
15 static efs_ino_t efs_find_entry(struct inode *inode, const char *name, int len) {
16 struct buffer_head *bh;
20 struct efs_dir *dirblock;
21 struct efs_dentry *dirslot;
25 if (inode->i_size & (EFS_DIRBSIZE-1))
26 pr_warn("%s(): directory size not a multiple of EFS_DIRBSIZE\n",
29 for(block = 0; block < inode->i_blocks; block++) {
31 bh = sb_bread(inode->i_sb, efs_bmap(inode, block));
33 pr_err("%s(): failed to read dir block %d\n",
38 dirblock = (struct efs_dir *) bh->b_data;
40 if (be16_to_cpu(dirblock->magic) != EFS_DIRBLK_MAGIC) {
41 pr_err("%s(): invalid directory block\n", __func__);
46 for(slot = 0; slot < dirblock->slots; slot++) {
47 dirslot = (struct efs_dentry *) (((char *) bh->b_data) + EFS_SLOTAT(dirblock, slot));
49 namelen = dirslot->namelen;
50 nameptr = dirslot->name;
52 if ((namelen == len) && (!memcmp(name, nameptr, len))) {
53 inodenum = be32_to_cpu(dirslot->inode);
63 struct dentry *efs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
66 struct inode *inode = NULL;
68 inodenum = efs_find_entry(dir, dentry->d_name.name, dentry->d_name.len);
70 inode = efs_iget(dir->i_sb, inodenum);
72 return d_splice_alias(inode, dentry);
75 static struct inode *efs_nfs_get_inode(struct super_block *sb, u64 ino,
81 return ERR_PTR(-ESTALE);
82 inode = efs_iget(sb, ino);
84 return ERR_CAST(inode);
86 if (generation && inode->i_generation != generation) {
88 return ERR_PTR(-ESTALE);
94 struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid,
95 int fh_len, int fh_type)
97 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
101 struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid,
102 int fh_len, int fh_type)
104 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
108 struct dentry *efs_get_parent(struct dentry *child)
110 struct dentry *parent = ERR_PTR(-ENOENT);
113 ino = efs_find_entry(child->d_inode, "..", 2);
115 parent = d_obtain_alias(efs_iget(child->d_inode->i_sb, ino));