[mirror_ubuntu-bionic-kernel.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;
	struct qnx4_inode_entry *de;
	struct qnx4_link_info *le;
	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) {
			offset = ix * QNX4_DIR_ENTRY_SIZE;
			de = (struct qnx4_inode_entry *) (bh->b_data + offset);
			if (!de->di_fname[0])
				continue;
			if (!(de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK)))
				continue;
			if (!(de->di_status & QNX4_FILE_LINK))
				size = QNX4_SHORT_NAME_MAX;
			else
				size = QNX4_NAME_MAX;
			size = strnlen(de->di_fname, size);
			QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, de->di_fname));
			if (!(de->di_status & QNX4_FILE_LINK))
				ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
			else {
				le  = (struct qnx4_link_info*)de;
				ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) *
					QNX4_INODES_PER_BLOCK +
					le->dl_inode_ndx;
			}
			if (!dir_emit(ctx, de->di_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;
	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
891ddb95	29	QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
663f4dec	30	QNX4DEBUG((KERN_INFO "pos = %ld\n", (long) ctx->pos));
1da177e4	31
663f4dec AV	32	while (ctx->pos < inode->i_size) {
663f4dec AV	33	blknum = qnx4_block_map(inode, ctx->pos >> QNX4_BLOCK_SIZE_BITS);
1da177e4	34	bh = sb_bread(inode->i_sb, blknum);
663f4dec	35	if (bh == NULL) {
1da177e4	36	printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
663f4dec	37	return 0;
1da177e4	38	}
663f4dec AV	39	ix = (ctx->pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
663f4dec AV	40	for (; ix < QNX4_INODES_PER_BLOCK; ix++, ctx->pos += QNX4_DIR_ENTRY_SIZE) {
1da177e4 LT	41	offset = ix * QNX4_DIR_ENTRY_SIZE;
1da177e4 LT	42	de = (struct qnx4_inode_entry *) (bh->b_data + offset);
663f4dec AV	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;
1da177e4	64	}
1da177e4 LT	65	}
	66	brelse(bh);
	67	}
1da177e4 LT	68	return 0;
	69	}
	70
4b6f5d20	71	const struct file_operations qnx4_dir_operations =
1da177e4	72	{
ca572727	73	.llseek = generic_file_llseek,
1da177e4	74	.read = generic_read_dir,
c51da20c	75	.iterate_shared = qnx4_readdir,
1b061d92	76	.fsync = generic_file_fsync,
1da177e4 LT	77	};
1da177e4 LT	78
c5ef1c42	79	const struct inode_operations qnx4_dir_inode_operations =
1da177e4 LT	80	{
1da177e4 LT	81	.lookup = qnx4_lookup,
1da177e4	82	};