linux/fs/qnx4/dir.c
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   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
  14#include <linux/buffer_head.h>
  15#include "qnx4.h"
  16
  17static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir)
  18{
  19        struct inode *inode = filp->f_path.dentry->d_inode;
  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
  28        QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
  29        QNX4DEBUG((KERN_INFO "filp->f_pos         = %ld\n", (long) filp->f_pos));
  30
  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 ) {
  50                                        QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, de->di_fname));
  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;
  55                                                ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) *
  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        }
  70out:
  71        return 0;
  72}
  73
  74const struct file_operations qnx4_dir_operations =
  75{
  76        .llseek         = generic_file_llseek,
  77        .read           = generic_read_dir,
  78        .readdir        = qnx4_readdir,
  79        .fsync          = generic_file_fsync,
  80};
  81
  82const struct inode_operations qnx4_dir_inode_operations =
  83{
  84        .lookup         = qnx4_lookup,
  85};
  86
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