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

/*
 * 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 *filp, void *dirent, filldir_t filldir)
{
	struct inode *inode = filp->f_path.dentry->d_inode;
	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 "filp->f_pos         = %ld\n", (long) filp->f_pos));

	while (filp->f_pos < inode->i_size) {
		blknum = qnx4_block_map( inode, filp->f_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);
			break;
		}
		ix = (int)(filp->f_pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
		while (ix < QNX4_INODES_PER_BLOCK) {
			offset = ix * QNX4_DIR_ENTRY_SIZE;
			de = (struct qnx4_inode_entry *) (bh->b_data + offset);
			size = strlen(de->di_fname);
			if (size) {
				if ( !( de->di_status & QNX4_FILE_LINK ) && size > QNX4_SHORT_NAME_MAX )
					size = QNX4_SHORT_NAME_MAX;
				else if ( size > QNX4_NAME_MAX )
					size = QNX4_NAME_MAX;

				if ( ( de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK) ) != 0 ) {
					QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, de->di_fname));
					if ( ( de->di_status & QNX4_FILE_LINK ) == 0 )
						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 (filldir(dirent, de->di_fname, size, filp->f_pos, ino, DT_UNKNOWN) < 0) {
						brelse(bh);
						goto out;
					}
				}
			}
			ix++;
			filp->f_pos += QNX4_DIR_ENTRY_SIZE;
		}
		brelse(bh);
	}
out:
	return 0;
}

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

const struct inode_operations qnx4_dir_inode_operations =
{
	.lookup		= qnx4_lookup,
};
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 LT	16
	17	static int qnx4_readdir(struct file filp, void dirent, filldir_t filldir)
	18	{
24e23c24	19	struct inode *inode = filp->f_path.dentry->d_inode;
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 AL	28	QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
891ddb95 AL	29	QNX4DEBUG((KERN_INFO "filp->f_pos = %ld\n", (long) filp->f_pos));
1da177e4	30
1da177e4 LT	31	while (filp->f_pos < inode->i_size) {
	32	blknum = qnx4_block_map( inode, filp->f_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	break;
	37	}
	38	ix = (int)(filp->f_pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
	39	while (ix < QNX4_INODES_PER_BLOCK) {
	40	offset = ix * QNX4_DIR_ENTRY_SIZE;
	41	de = (struct qnx4_inode_entry *) (bh->b_data + offset);
	42	size = strlen(de->di_fname);
	43	if (size) {
	44	if ( !( de->di_status & QNX4_FILE_LINK ) && size > QNX4_SHORT_NAME_MAX )
	45	size = QNX4_SHORT_NAME_MAX;
	46	else if ( size > QNX4_NAME_MAX )
	47	size = QNX4_NAME_MAX;
	48
	49	if ( ( de->di_status & (QNX4_FILE_USED\|QNX4_FILE_LINK) ) != 0 ) {
891ddb95	50	QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, de->di_fname));
1da177e4 LT	51	if ( ( de->di_status & QNX4_FILE_LINK ) == 0 )
	52	ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
	53	else {
	54	le = (struct qnx4_link_info*)de;
75043cb5	55	ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) *
1da177e4 LT	56	QNX4_INODES_PER_BLOCK +
	57	le->dl_inode_ndx;
	58	}
	59	if (filldir(dirent, de->di_fname, size, filp->f_pos, ino, DT_UNKNOWN) < 0) {
	60	brelse(bh);
	61	goto out;
	62	}
	63	}
	64	}
	65	ix++;
	66	filp->f_pos += QNX4_DIR_ENTRY_SIZE;
	67	}
	68	brelse(bh);
	69	}
	70	out:
1da177e4 LT	71	return 0;
	72	}
	73
4b6f5d20	74	const struct file_operations qnx4_dir_operations =
1da177e4	75	{
ca572727	76	.llseek = generic_file_llseek,
1da177e4 LT	77	.read = generic_read_dir,
1da177e4 LT	78	.readdir = qnx4_readdir,
1b061d92	79	.fsync = generic_file_fsync,
1da177e4 LT	80	};
1da177e4 LT	81
c5ef1c42	82	const struct inode_operations qnx4_dir_inode_operations =
1da177e4 LT	83	{
1da177e4 LT	84	.lookup = qnx4_lookup,
1da177e4	85	};