Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * namei.c | |
3 | * | |
4 | * Copyright (c) 1999 Al Smith | |
5 | * | |
6 | * Portions derived from work (c) 1995,1996 Christian Vogelgsang. | |
7 | */ | |
8 | ||
9 | #include <linux/buffer_head.h> | |
10 | #include <linux/string.h> | |
05da0804 | 11 | #include <linux/exportfs.h> |
45254b4f | 12 | #include "efs.h" |
05da0804 | 13 | |
1da177e4 LT |
14 | |
15 | static efs_ino_t efs_find_entry(struct inode *inode, const char *name, int len) { | |
16 | struct buffer_head *bh; | |
17 | ||
18 | int slot, namelen; | |
19 | char *nameptr; | |
20 | struct efs_dir *dirblock; | |
21 | struct efs_dentry *dirslot; | |
22 | efs_ino_t inodenum; | |
23 | efs_block_t block; | |
24 | ||
25 | if (inode->i_size & (EFS_DIRBSIZE-1)) | |
f403d1db FF |
26 | pr_warn("%s(): directory size not a multiple of EFS_DIRBSIZE\n", |
27 | __func__); | |
1da177e4 LT |
28 | |
29 | for(block = 0; block < inode->i_blocks; block++) { | |
30 | ||
31 | bh = sb_bread(inode->i_sb, efs_bmap(inode, block)); | |
32 | if (!bh) { | |
f403d1db FF |
33 | pr_err("%s(): failed to read dir block %d\n", |
34 | __func__, block); | |
1da177e4 LT |
35 | return 0; |
36 | } | |
37 | ||
38 | dirblock = (struct efs_dir *) bh->b_data; | |
39 | ||
40 | if (be16_to_cpu(dirblock->magic) != EFS_DIRBLK_MAGIC) { | |
f403d1db | 41 | pr_err("%s(): invalid directory block\n", __func__); |
1da177e4 LT |
42 | brelse(bh); |
43 | return(0); | |
44 | } | |
45 | ||
46 | for(slot = 0; slot < dirblock->slots; slot++) { | |
47 | dirslot = (struct efs_dentry *) (((char *) bh->b_data) + EFS_SLOTAT(dirblock, slot)); | |
48 | ||
49 | namelen = dirslot->namelen; | |
50 | nameptr = dirslot->name; | |
51 | ||
52 | if ((namelen == len) && (!memcmp(name, nameptr, len))) { | |
53 | inodenum = be32_to_cpu(dirslot->inode); | |
54 | brelse(bh); | |
55 | return(inodenum); | |
56 | } | |
57 | } | |
58 | brelse(bh); | |
59 | } | |
60 | return(0); | |
61 | } | |
62 | ||
00cd8dd3 AV |
63 | struct dentry *efs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
64 | { | |
1da177e4 | 65 | efs_ino_t inodenum; |
a9049376 | 66 | struct inode *inode = NULL; |
1da177e4 | 67 | |
1da177e4 | 68 | inodenum = efs_find_entry(dir, dentry->d_name.name, dentry->d_name.len); |
a9049376 | 69 | if (inodenum) |
298384cd | 70 | inode = efs_iget(dir->i_sb, inodenum); |
1da177e4 | 71 | |
2d8a10cd | 72 | return d_splice_alias(inode, dentry); |
1da177e4 LT |
73 | } |
74 | ||
05da0804 CH |
75 | static struct inode *efs_nfs_get_inode(struct super_block *sb, u64 ino, |
76 | u32 generation) | |
5ca29607 | 77 | { |
5ca29607 | 78 | struct inode *inode; |
5ca29607 CH |
79 | |
80 | if (ino == 0) | |
81 | return ERR_PTR(-ESTALE); | |
298384cd DH |
82 | inode = efs_iget(sb, ino); |
83 | if (IS_ERR(inode)) | |
84 | return ERR_CAST(inode); | |
5ca29607 | 85 | |
298384cd | 86 | if (generation && inode->i_generation != generation) { |
05da0804 CH |
87 | iput(inode); |
88 | return ERR_PTR(-ESTALE); | |
5ca29607 CH |
89 | } |
90 | ||
05da0804 CH |
91 | return inode; |
92 | } | |
5ca29607 | 93 | |
05da0804 CH |
94 | struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid, |
95 | int fh_len, int fh_type) | |
96 | { | |
97 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
98 | efs_nfs_get_inode); | |
99 | } | |
100 | ||
101 | struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid, | |
102 | int fh_len, int fh_type) | |
103 | { | |
104 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
105 | efs_nfs_get_inode); | |
5ca29607 CH |
106 | } |
107 | ||
1da177e4 LT |
108 | struct dentry *efs_get_parent(struct dentry *child) |
109 | { | |
44003728 | 110 | struct dentry *parent = ERR_PTR(-ENOENT); |
1da177e4 | 111 | efs_ino_t ino; |
1da177e4 | 112 | |
1da177e4 | 113 | ino = efs_find_entry(child->d_inode, "..", 2); |
44003728 CH |
114 | if (ino) |
115 | parent = d_obtain_alias(efs_iget(child->d_inode->i_sb, ino)); | |
1da177e4 | 116 | |
44003728 | 117 | return parent; |
1da177e4 | 118 | } |