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
14#include <linux/buffer_head.h>
15#include "qnx4.h"
16
17static int qnx4_readdir(struct file *file, struct dir_context *ctx)
18{
19	struct inode *inode = file_inode(file);
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
28	QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
29	QNX4DEBUG((KERN_INFO "pos                 = %ld\n", (long) ctx->pos));
30
31	while (ctx->pos < inode->i_size) {
32		blknum = qnx4_block_map(inode, ctx->pos >> QNX4_BLOCK_SIZE_BITS);
33		bh = sb_bread(inode->i_sb, blknum);
34		if (bh == NULL) {
35			printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
36			return 0;
37		}
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) {
40			offset = ix * QNX4_DIR_ENTRY_SIZE;
41			de = (struct qnx4_inode_entry *) (bh->b_data + offset);
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;
63			}
64		}
65		brelse(bh);
66	}
67	return 0;
68}
69
70const struct file_operations qnx4_dir_operations =
71{
72	.llseek		= generic_file_llseek,
73	.read		= generic_read_dir,
74	.iterate	= qnx4_readdir,
75	.fsync		= generic_file_fsync,
76};
77
78const struct inode_operations qnx4_dir_inode_operations =
79{
80	.lookup		= qnx4_lookup,
81};

 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
18static int qnx4_readdir(struct file *file, struct dir_context *ctx)
19{
20	struct inode *inode = file_inode(file);
21	unsigned int offset;
22	struct buffer_head *bh;
23	struct qnx4_inode_entry *de;
24	struct qnx4_link_info *le;
25	unsigned long blknum;
26	int ix, ino;
27	int size;
28
29	QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
30	QNX4DEBUG((KERN_INFO "pos                 = %ld\n", (long) ctx->pos));
31
32	while (ctx->pos < inode->i_size) {
33		blknum = qnx4_block_map(inode, ctx->pos >> QNX4_BLOCK_SIZE_BITS);
34		bh = sb_bread(inode->i_sb, blknum);
35		if (bh == NULL) {
36			printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
37			return 0;
38		}
39		ix = (ctx->pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
40		for (; ix < QNX4_INODES_PER_BLOCK; ix++, ctx->pos += QNX4_DIR_ENTRY_SIZE) {
41			offset = ix * QNX4_DIR_ENTRY_SIZE;
42			de = (struct qnx4_inode_entry *) (bh->b_data + offset);
43			if (!de->di_fname[0])
44				continue;
45			if (!(de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK)))
46				continue;
47			if (!(de->di_status & QNX4_FILE_LINK))
48				size = QNX4_SHORT_NAME_MAX;
49			else
50				size = QNX4_NAME_MAX;
51			size = strnlen(de->di_fname, size);
52			QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, de->di_fname));
53			if (!(de->di_status & QNX4_FILE_LINK))
54				ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
55			else {
56				le  = (struct qnx4_link_info*)de;
57				ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) *
58					QNX4_INODES_PER_BLOCK +
59					le->dl_inode_ndx;
60			}
61			if (!dir_emit(ctx, de->di_fname, size, ino, DT_UNKNOWN)) {
62				brelse(bh);
63				return 0;
64			}
65		}
66		brelse(bh);
67	}
68	return 0;
69}
70
71const struct file_operations qnx4_dir_operations =
72{
73	.llseek		= generic_file_llseek,
74	.read		= generic_read_dir,
75	.iterate_shared	= qnx4_readdir,
76	.fsync		= generic_file_fsync,
77};
78
79const struct inode_operations qnx4_dir_inode_operations =
80{
81	.lookup		= qnx4_lookup,
82};