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1 | /* |
2 | * dir.c |
3 | * |
4 | * Copyright (c) 1999 Al Smith |
5 | */ |
6 | |
7 | #include <linux/buffer_head.h> |
8 | #include "efs.h" |
9 | |
10 | static int efs_readdir(struct file *, void *, filldir_t); |
11 | |
12 | const struct file_operations efs_dir_operations = { |
13 | .llseek = generic_file_llseek, |
14 | .read = generic_read_dir, |
15 | .readdir = efs_readdir, |
16 | }; |
17 | |
18 | const struct inode_operations efs_dir_inode_operations = { |
19 | .lookup = efs_lookup, |
20 | }; |
21 | |
22 | static int efs_readdir(struct file *filp, void *dirent, filldir_t filldir) { |
23 | struct inode *inode = filp->f_path.dentry->d_inode; |
24 | struct buffer_head *bh; |
25 | |
26 | struct efs_dir *dirblock; |
27 | struct efs_dentry *dirslot; |
28 | efs_ino_t inodenum; |
29 | efs_block_t block; |
30 | int slot, namelen; |
31 | char *nameptr; |
32 | |
33 | if (inode->i_size & (EFS_DIRBSIZE-1)) |
34 | printk(KERN_WARNING "EFS: WARNING: readdir(): directory size not a multiple of EFS_DIRBSIZE\n"); |
35 | |
36 | /* work out where this entry can be found */ |
37 | block = filp->f_pos >> EFS_DIRBSIZE_BITS; |
38 | |
39 | /* each block contains at most 256 slots */ |
40 | slot = filp->f_pos & 0xff; |
41 | |
42 | /* look at all blocks */ |
43 | while (block < inode->i_blocks) { |
44 | /* read the dir block */ |
45 | bh = sb_bread(inode->i_sb, efs_bmap(inode, block)); |
46 | |
47 | if (!bh) { |
48 | printk(KERN_ERR "EFS: readdir(): failed to read dir block %d\n", block); |
49 | break; |
50 | } |
51 | |
52 | dirblock = (struct efs_dir *) bh->b_data; |
53 | |
54 | if (be16_to_cpu(dirblock->magic) != EFS_DIRBLK_MAGIC) { |
55 | printk(KERN_ERR "EFS: readdir(): invalid directory block\n"); |
56 | brelse(bh); |
57 | break; |
58 | } |
59 | |
60 | while (slot < dirblock->slots) { |
61 | if (dirblock->space[slot] == 0) { |
62 | slot++; |
63 | continue; |
64 | } |
65 | |
66 | dirslot = (struct efs_dentry *) (((char *) bh->b_data) + EFS_SLOTAT(dirblock, slot)); |
67 | |
68 | inodenum = be32_to_cpu(dirslot->inode); |
69 | namelen = dirslot->namelen; |
70 | nameptr = dirslot->name; |
71 | |
72 | #ifdef DEBUG |
73 | printk(KERN_DEBUG "EFS: readdir(): block %d slot %d/%d: inode %u, name \"%s\", namelen %u\n", block, slot, dirblock->slots-1, inodenum, nameptr, namelen); |
74 | #endif |
75 | if (namelen > 0) { |
76 | /* found the next entry */ |
77 | filp->f_pos = (block << EFS_DIRBSIZE_BITS) | slot; |
78 | |
79 | /* copy filename and data in dirslot */ |
80 | filldir(dirent, nameptr, namelen, filp->f_pos, inodenum, DT_UNKNOWN); |
81 | |
82 | /* sanity check */ |
83 | if (nameptr - (char *) dirblock + namelen > EFS_DIRBSIZE) { |
84 | printk(KERN_WARNING "EFS: directory entry %d exceeds directory block\n", slot); |
85 | slot++; |
86 | continue; |
87 | } |
88 | |
89 | /* store position of next slot */ |
90 | if (++slot == dirblock->slots) { |
91 | slot = 0; |
92 | block++; |
93 | } |
94 | brelse(bh); |
95 | filp->f_pos = (block << EFS_DIRBSIZE_BITS) | slot; |
96 | goto out; |
97 | } |
98 | slot++; |
99 | } |
100 | brelse(bh); |
101 | |
102 | slot = 0; |
103 | block++; |
104 | } |
105 | |
106 | filp->f_pos = (block << EFS_DIRBSIZE_BITS) | slot; |
107 | out: |
108 | return 0; |
109 | } |
110 | |
111 |
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