root/fs/iso9660/symlink.c

/* */

DEFINITIONS

1. iso9660_readlink
2. iso9660_followlink

   1 /*
   2  * fiwix/fs/iso9660/symlink.c
   3  *
   4  * Copyright 2018-2021, Jordi Sanfeliu. All rights reserved.
   5  * Distributed under the terms of the Fiwix License.
   6  */
   7 
   8 #include <fiwix/types.h>
   9 #include <fiwix/errno.h>
  10 #include <fiwix/buffer.h>
  11 #include <fiwix/fs.h>
  12 #include <fiwix/filesystems.h>
  13 #include <fiwix/fs_iso9660.h>
  14 #include <fiwix/stat.h>
  15 #include <fiwix/mm.h>
  16 #include <fiwix/stdio.h>
  17 #include <fiwix/string.h>
  18 
  19 struct fs_operations iso9660_symlink_fsop = {
  20         0,
  21         0,
  22 
  23         NULL,                   /* open */
  24         NULL,                   /* close */
  25         NULL,                   /* read */
  26         NULL,                   /* write */
  27         NULL,                   /* ioctl */
  28         NULL,                   /* lseek */
  29         NULL,                   /* readdir */
  30         NULL,                   /* mmap */
  31         NULL,                   /* select */
  32 
  33         iso9660_readlink,
  34         iso9660_followlink,
  35         NULL,                   /* bmap */
  36         NULL,                   /* lookup */
  37         NULL,                   /* rmdir */
  38         NULL,                   /* link */
  39         NULL,                   /* unlink */
  40         NULL,                   /* symlink */
  41         NULL,                   /* mkdir */
  42         NULL,                   /* mknod */
  43         NULL,                   /* truncate */
  44         NULL,                   /* create */
  45         NULL,                   /* rename */
  46 
  47         NULL,                   /* read_block */
  48         NULL,                   /* write_block */
  49 
  50         NULL,                   /* read_inode */
  51         NULL,                   /* write_inode */
  52         NULL,                   /* ialloc */
  53         NULL,                   /* ifree */
  54         NULL,                   /* statfs */
  55         NULL,                   /* read_superblock */
  56         NULL,                   /* remount_fs */
  57         NULL,                   /* write_superblock */
  58         NULL                    /* release_superblock */
  59 };
  60 
  61 int iso9660_readlink(struct inode *i, char *buffer, __size_t count)
  62 {
  63         __off_t size_read;
  64         char *name;
  65 
  66         if(!(name = (char *)kmalloc())) {
  67                 return -ENOMEM;
  68         }
  69 
  70         inode_lock(i);
  71         name[0] = NULL;
  72         if((size_read = get_rrip_symlink(i, name))) {
  73                 size_read = MIN(size_read, count);
  74                 memcpy_b(buffer, name, size_read);
  75         }
  76         kfree((unsigned int)name);
  77         inode_unlock(i);
  78         return size_read;
  79 }
  80 
  81 int iso9660_followlink(struct inode *dir, struct inode *i, struct inode **i_res)
  82 {
  83         char *name;
  84         __ino_t errno;
  85 
  86         if(!i) {
  87                 return -ENOENT;
  88         }
  89         if(!S_ISLNK(i->i_mode)) {
  90                 printk("%s(): Oops, inode '%d' is not a symlink (!?).\n", __FUNCTION__, i->inode);
  91                 return 0;
  92         }
  93 
  94         if(!(name = (char *)kmalloc())) {
  95                 return -ENOMEM;
  96         }
  97 
  98         name[0] = NULL;
  99         if(get_rrip_symlink(i, name)) {
 100                 iput(i);
 101                 if((errno = parse_namei(name, dir, i_res, NULL, FOLLOW_LINKS))) {
 102                         kfree((unsigned int)name);
 103                         return errno;
 104                 }
 105         }
 106         kfree((unsigned int)name);
 107         return 0;
 108 }

/* */