root/fs/qnx4/dir.c

DEFINITIONS

1. qnx4_readdir

/*
 * 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/string.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/qnx4_fs.h>
#include <linux/stat.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.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(("qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
        QNX4DEBUG(("filp->f_pos         = %ld\n", (long) filp->f_pos));

        lock_kernel();

        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 = ( 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:
        unlock_kernel();
        return 0;
}

const struct file_operations qnx4_dir_operations =
{
        .read           = generic_read_dir,
        .readdir        = qnx4_readdir,
        .fsync          = file_fsync,
};

const struct inode_operations qnx4_dir_inode_operations =
{
        .lookup         = qnx4_lookup,
#ifdef CONFIG_QNX4FS_RW
        .create         = qnx4_create,
        .unlink         = qnx4_unlink,
        .rmdir          = qnx4_rmdir,
#endif
};