1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * QNX4 file system, Linux implementation. |
4 | * |
5 | * Version : 0.2.1 |
6 | * |
7 | * Using parts of the xiafs filesystem. |
8 | * |
9 | * History : |
10 | * |
11 | * 28-05-1998 by Richard Frowijn : first release. |
12 | * 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support. |
13 | */ |
14 | |
15 | #include <linux/buffer_head.h> |
16 | #include "qnx4.h" |
17 | |
18 | static int qnx4_readdir(struct file *file, struct dir_context *ctx) |
19 | { |
20 | struct inode *inode = file_inode(f: file); |
21 | unsigned int offset; |
22 | struct buffer_head *bh; |
23 | unsigned long blknum; |
24 | int ix, ino; |
25 | int size; |
26 | |
27 | QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n" , (long) inode->i_size)); |
28 | QNX4DEBUG((KERN_INFO "pos = %ld\n" , (long) ctx->pos)); |
29 | |
30 | while (ctx->pos < inode->i_size) { |
31 | blknum = qnx4_block_map(inode, iblock: ctx->pos >> QNX4_BLOCK_SIZE_BITS); |
32 | bh = sb_bread(sb: inode->i_sb, block: blknum); |
33 | if (bh == NULL) { |
34 | printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n" , blknum); |
35 | return 0; |
36 | } |
37 | ix = (ctx->pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK; |
38 | for (; ix < QNX4_INODES_PER_BLOCK; ix++, ctx->pos += QNX4_DIR_ENTRY_SIZE) { |
39 | union qnx4_directory_entry *de; |
40 | const char *fname; |
41 | |
42 | offset = ix * QNX4_DIR_ENTRY_SIZE; |
43 | de = (union qnx4_directory_entry *) (bh->b_data + offset); |
44 | |
45 | fname = get_entry_fname(de, size: &size); |
46 | if (!fname) |
47 | continue; |
48 | |
49 | if (!(de->de_status & QNX4_FILE_LINK)) { |
50 | ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1; |
51 | } else { |
52 | ino = ( le32_to_cpu(de->link.dl_inode_blk) - 1 ) * |
53 | QNX4_INODES_PER_BLOCK + |
54 | de->link.dl_inode_ndx; |
55 | } |
56 | |
57 | QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n" , size, fname)); |
58 | if (!dir_emit(ctx, name: fname, namelen: size, ino, DT_UNKNOWN)) { |
59 | brelse(bh); |
60 | return 0; |
61 | } |
62 | } |
63 | brelse(bh); |
64 | } |
65 | return 0; |
66 | } |
67 | |
68 | const struct file_operations qnx4_dir_operations = |
69 | { |
70 | .llseek = generic_file_llseek, |
71 | .read = generic_read_dir, |
72 | .iterate_shared = qnx4_readdir, |
73 | .fsync = generic_file_fsync, |
74 | }; |
75 | |
76 | const struct inode_operations qnx4_dir_inode_operations = |
77 | { |
78 | .lookup = qnx4_lookup, |
79 | }; |
80 | |