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/*

 * 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/config.h>

#include <linux/string.h>

#include <linux/errno.h>

#include <linux/fs.h>

#include <linux/qnx4_fs.h>

#include <linux/stat.h>

#include <asm/segment.h>

static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir)

{

        struct inode *inode = filp->f_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(("qnx4_readdir:i_size = %ld\n", (long) inode->i_size));

        QNX4DEBUG(("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(("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 = ( 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);

                                                return 0;

                                        }

                                }

                        }

                        ix++;

                        filp->f_pos += QNX4_DIR_ENTRY_SIZE;

                }

                brelse(bh);

        }

        UPDATE_ATIME(inode);

        return 0;

}

struct file_operations qnx4_dir_operations =

{

        read:           generic_read_dir,

        readdir:        qnx4_readdir,

        fsync:          file_fsync,

};

struct inode_operations qnx4_dir_inode_operations =

{

        lookup:         qnx4_lookup,

#ifdef CONFIG_QNX4FS_RW

        create:         qnx4_create,

        unlink:         qnx4_unlink,

        rmdir:          qnx4_rmdir,

#endif

};