LXR linux-old/fs/qnx4/dir.c

   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/config.h>
  15#include <linux/string.h>
  16#include <linux/errno.h>
  17#include <linux/fs.h>
  18#include <linux/qnx4_fs.h>
  19#include <linux/stat.h>
  20
  21#include <asm/segment.h>
  22
  23static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir)
  24{
  25        struct inode *inode = filp->f_dentry->d_inode;
  26        unsigned int offset;
  27        struct buffer_head *bh;
  28        struct qnx4_inode_entry *de;
  29        struct qnx4_link_info *le;
  30        unsigned long blknum;
  31        int ix, ino;
  32        int size;
  33
  34        QNX4DEBUG(("qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
  35        QNX4DEBUG(("filp->f_pos         = %ld\n", (long) filp->f_pos));
  36
  37        while (filp->f_pos < inode->i_size) {
  38                blknum = qnx4_block_map( inode, filp->f_pos >> QNX4_BLOCK_SIZE_BITS );
  39                bh = sb_bread(inode->i_sb, blknum);
  40                if(bh==NULL) {
  41                        printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
  42                        break;
  43                }
  44                ix = (int)(filp->f_pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
  45                while (ix < QNX4_INODES_PER_BLOCK) {
  46                        offset = ix * QNX4_DIR_ENTRY_SIZE;
  47                        de = (struct qnx4_inode_entry *) (bh->b_data + offset);
  48                        size = strlen(de->di_fname);
  49                        if (size) {
  50                                if ( !( de->di_status & QNX4_FILE_LINK ) && size > QNX4_SHORT_NAME_MAX )
  51                                        size = QNX4_SHORT_NAME_MAX;
  52                                else if ( size > QNX4_NAME_MAX )
  53                                        size = QNX4_NAME_MAX;
  54
  55                                if ( ( de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK) ) != 0 ) {
  56                                        QNX4DEBUG(("qnx4_readdir:%.*s\n", size, de->di_fname));
  57                                        if ( ( de->di_status & QNX4_FILE_LINK ) == 0 )
  58                                                ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
  59                                        else {
  60                                                le  = (struct qnx4_link_info*)de;
  61                                                ino = ( le->dl_inode_blk - 1 ) *
  62                                                        QNX4_INODES_PER_BLOCK +
  63                                                        le->dl_inode_ndx;
  64                                        }
  65                                        if (filldir(dirent, de->di_fname, size, filp->f_pos, ino, DT_UNKNOWN) < 0) {
  66                                                brelse(bh);
  67                                                return 0;
  68                                        }
  69                                }
  70                        }
  71                        ix++;
  72                        filp->f_pos += QNX4_DIR_ENTRY_SIZE;
  73                }
  74                brelse(bh);
  75        }
  76        UPDATE_ATIME(inode);
  77
  78        return 0;
  79}
  80
  81struct file_operations qnx4_dir_operations =
  82{
  83        read:           generic_read_dir,
  84        readdir:        qnx4_readdir,
  85        fsync:          file_fsync,
  86};
  87
  88struct inode_operations qnx4_dir_inode_operations =
  89{
  90        lookup:         qnx4_lookup,
  91#ifdef CONFIG_QNX4FS_RW
  92        create:         qnx4_create,
  93        unlink:         qnx4_unlink,
  94        rmdir:          qnx4_rmdir,
  95#endif
  96};
  97