[linux-block.git] / fs / qnx4 / dir.c

// SPDX-License-Identifier: GPL-2.0
/*
 * QNX4 file system, Linux implementation.
 *
 * Version : 0.2.1
 *
 * Using parts of the xiafs filesystem.
 *
 * History :
 *
 * 28-05-1998 by Richard Frowijn : first release.
 * 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support.
 */

#include <linux/buffer_head.h>
#include "qnx4.h"

static int qnx4_readdir(struct file *file, struct dir_context *ctx)
{
	struct inode *inode = file_inode(file);
	unsigned int offset;
	struct buffer_head *bh;
	unsigned long blknum;
	int ix, ino;
	int size;

	QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
	QNX4DEBUG((KERN_INFO "pos                 = %ld\n", (long) ctx->pos));

	while (ctx->pos < inode->i_size) {
		blknum = qnx4_block_map(inode, ctx->pos >> QNX4_BLOCK_SIZE_BITS);
		bh = sb_bread(inode->i_sb, blknum);
		if (bh == NULL) {
			printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
			return 0;
		}
		ix = (ctx->pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
		for (; ix < QNX4_INODES_PER_BLOCK; ix++, ctx->pos += QNX4_DIR_ENTRY_SIZE) {
			union qnx4_directory_entry *de;
			const char *fname;

			offset = ix * QNX4_DIR_ENTRY_SIZE;
			de = (union qnx4_directory_entry *) (bh->b_data + offset);

			fname = get_entry_fname(de, &size);
			if (!fname)
				continue;

			if (!(de->de_status & QNX4_FILE_LINK)) {
				ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
			} else {
				ino = ( le32_to_cpu(de->link.dl_inode_blk) - 1 ) *
					QNX4_INODES_PER_BLOCK +
					de->link.dl_inode_ndx;
			}

			QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, fname));
			if (!dir_emit(ctx, fname, size, ino, DT_UNKNOWN)) {
				brelse(bh);
				return 0;
			}
		}
		brelse(bh);
	}
	return 0;
}

const struct file_operations qnx4_dir_operations =
{
	.llseek		= generic_file_llseek,
	.read		= generic_read_dir,
	.iterate_shared	= qnx4_readdir,
	.fsync		= generic_file_fsync,
};

const struct inode_operations qnx4_dir_inode_operations =
{
	.lookup		= qnx4_lookup,
};
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	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
1da177e4	15	#include <linux/buffer_head.h>
964f5369	16	#include "qnx4.h"
1da177e4	17
663f4dec	18	static int qnx4_readdir(struct file file, struct dir_context ctx)
1da177e4	19	{
663f4dec	20	struct inode *inode = file_inode(file);
1da177e4 LT	21	unsigned int offset;
1da177e4 LT	22	struct buffer_head *bh;
1da177e4 LT	23	unsigned long blknum;
	24	int ix, ino;
	25	int size;
	26
891ddb95	27	QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
663f4dec	28	QNX4DEBUG((KERN_INFO "pos = %ld\n", (long) ctx->pos));
1da177e4	29
663f4dec AV	30	while (ctx->pos < inode->i_size) {
663f4dec AV	31	blknum = qnx4_block_map(inode, ctx->pos >> QNX4_BLOCK_SIZE_BITS);
1da177e4	32	bh = sb_bread(inode->i_sb, blknum);
663f4dec	33	if (bh == NULL) {
1da177e4	34	printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
663f4dec	35	return 0;
1da177e4	36	}
663f4dec AV	37	ix = (ctx->pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
663f4dec AV	38	for (; ix < QNX4_INODES_PER_BLOCK; ix++, ctx->pos += QNX4_DIR_ENTRY_SIZE) {
b7213ffa	39	union qnx4_directory_entry *de;
53853995	40	const char *fname;
b7213ffa	41
1da177e4	42	offset = ix * QNX4_DIR_ENTRY_SIZE;
b7213ffa LT	43	de = (union qnx4_directory_entry *) (bh->b_data + offset);
b7213ffa LT	44
53853995 KC	45	fname = get_entry_fname(de, &size);
53853995 KC	46	if (!fname)
663f4dec	47	continue;
53853995	48
b7213ffa	49	if (!(de->de_status & QNX4_FILE_LINK)) {
663f4dec	50	ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
b7213ffa	51	} else {
b7213ffa	52	ino = ( le32_to_cpu(de->link.dl_inode_blk) - 1 ) *
663f4dec	53	QNX4_INODES_PER_BLOCK +
b7213ffa	54	de->link.dl_inode_ndx;
663f4dec	55	}
53853995 KC	56
	57	QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, fname));
	58	if (!dir_emit(ctx, fname, size, ino, DT_UNKNOWN)) {
663f4dec AV	59	brelse(bh);
663f4dec AV	60	return 0;
1da177e4	61	}
1da177e4 LT	62	}
	63	brelse(bh);
	64	}
1da177e4 LT	65	return 0;
	66	}
	67
4b6f5d20	68	const struct file_operations qnx4_dir_operations =
1da177e4	69	{
ca572727	70	.llseek = generic_file_llseek,
1da177e4	71	.read = generic_read_dir,
c51da20c	72	.iterate_shared = qnx4_readdir,
1b061d92	73	.fsync = generic_file_fsync,
1da177e4 LT	74	};
1da177e4 LT	75
c5ef1c42	76	const struct inode_operations qnx4_dir_inode_operations =
1da177e4 LT	77	{
1da177e4 LT	78	.lookup = qnx4_lookup,
1da177e4	79	};