Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * QNX4 file system, Linux implementation. | |
3 | * | |
4 | * Version : 0.2.1 | |
5 | * | |
6 | * Using parts of the xiafs filesystem. | |
7 | * | |
8 | * History : | |
9 | * | |
10 | * 28-05-1998 by Richard Frowijn : first release. | |
11 | * 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support. | |
12 | */ | |
13 | ||
1da177e4 | 14 | #include <linux/buffer_head.h> |
964f5369 | 15 | #include "qnx4.h" |
1da177e4 | 16 | |
663f4dec | 17 | static int qnx4_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 18 | { |
663f4dec | 19 | struct inode *inode = file_inode(file); |
1da177e4 LT |
20 | unsigned int offset; |
21 | struct buffer_head *bh; | |
22 | struct qnx4_inode_entry *de; | |
23 | struct qnx4_link_info *le; | |
24 | unsigned long blknum; | |
25 | int ix, ino; | |
26 | int size; | |
27 | ||
891ddb95 | 28 | QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size)); |
663f4dec | 29 | QNX4DEBUG((KERN_INFO "pos = %ld\n", (long) ctx->pos)); |
1da177e4 | 30 | |
663f4dec AV |
31 | while (ctx->pos < inode->i_size) { |
32 | blknum = qnx4_block_map(inode, ctx->pos >> QNX4_BLOCK_SIZE_BITS); | |
1da177e4 | 33 | bh = sb_bread(inode->i_sb, blknum); |
663f4dec | 34 | if (bh == NULL) { |
1da177e4 | 35 | printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum); |
663f4dec | 36 | return 0; |
1da177e4 | 37 | } |
663f4dec AV |
38 | ix = (ctx->pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK; |
39 | for (; ix < QNX4_INODES_PER_BLOCK; ix++, ctx->pos += QNX4_DIR_ENTRY_SIZE) { | |
1da177e4 LT |
40 | offset = ix * QNX4_DIR_ENTRY_SIZE; |
41 | de = (struct qnx4_inode_entry *) (bh->b_data + offset); | |
663f4dec AV |
42 | if (!de->di_fname[0]) |
43 | continue; | |
44 | if (!(de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK))) | |
45 | continue; | |
46 | if (!(de->di_status & QNX4_FILE_LINK)) | |
47 | size = QNX4_SHORT_NAME_MAX; | |
48 | else | |
49 | size = QNX4_NAME_MAX; | |
50 | size = strnlen(de->di_fname, size); | |
51 | QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, de->di_fname)); | |
52 | if (!(de->di_status & QNX4_FILE_LINK)) | |
53 | ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1; | |
54 | else { | |
55 | le = (struct qnx4_link_info*)de; | |
56 | ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) * | |
57 | QNX4_INODES_PER_BLOCK + | |
58 | le->dl_inode_ndx; | |
59 | } | |
60 | if (!dir_emit(ctx, de->di_fname, size, ino, DT_UNKNOWN)) { | |
61 | brelse(bh); | |
62 | return 0; | |
1da177e4 | 63 | } |
1da177e4 LT |
64 | } |
65 | brelse(bh); | |
66 | } | |
1da177e4 LT |
67 | return 0; |
68 | } | |
69 | ||
4b6f5d20 | 70 | const struct file_operations qnx4_dir_operations = |
1da177e4 | 71 | { |
ca572727 | 72 | .llseek = generic_file_llseek, |
1da177e4 | 73 | .read = generic_read_dir, |
663f4dec | 74 | .iterate = qnx4_readdir, |
1b061d92 | 75 | .fsync = generic_file_fsync, |
1da177e4 LT |
76 | }; |
77 | ||
c5ef1c42 | 78 | const struct inode_operations qnx4_dir_inode_operations = |
1da177e4 LT |
79 | { |
80 | .lookup = qnx4_lookup, | |
1da177e4 | 81 | }; |