minix/lib/libvtreefs/stadir.c

   1 /* VTreeFS - stadir.c - file and file system status management */
   2
   3 #include "inc.h"
   4
   5 /*
   6  * Retrieve file status.
   7  */
   8 int
   9 fs_stat(ino_t ino_nr, struct stat * buf)
  10 {
  11         char path[PATH_MAX];
  12         time_t cur_time;
  13         struct inode *node;
  14         int r;
  15
  16         if ((node = find_inode(ino_nr)) == NULL)
  17                 return EINVAL;
  18
  19         /* Fill in the basic info. */
  20         buf->st_mode = node->i_stat.mode;
  21         buf->st_nlink = !is_inode_deleted(node);
  22         buf->st_uid = node->i_stat.uid;
  23         buf->st_gid = node->i_stat.gid;
  24         buf->st_rdev = (dev_t) node->i_stat.dev;
  25         buf->st_size = node->i_stat.size;
  26
  27         /* If it is a symbolic link, return the size of the link target. */
  28         if (S_ISLNK(node->i_stat.mode) && vtreefs_hooks->rdlink_hook != NULL) {
  29                 r = vtreefs_hooks->rdlink_hook(node, path, sizeof(path),
  30                     get_inode_cbdata(node));
  31
  32                 if (r == OK)
  33                         buf->st_size = strlen(path);
  34         }
  35
  36         /* Take the current time as file time for all files. */
  37         cur_time = clock_time(NULL);
  38         buf->st_atime = cur_time;
  39         buf->st_mtime = cur_time;
  40         buf->st_ctime = cur_time;
  41
  42         return OK;
  43 }
  44
  45 /*
  46  * Change file mode.
  47  */
  48 int
  49 fs_chmod(ino_t ino_nr, mode_t * mode)
  50 {
  51         struct inode *node;
  52         struct inode_stat istat;
  53         int r;
  54
  55         if ((node = find_inode(ino_nr)) == NULL)
  56                 return EINVAL;
  57
  58         if (vtreefs_hooks->chstat_hook == NULL)
  59                 return ENOSYS;
  60
  61         get_inode_stat(node, &istat);
  62
  63         istat.mode = (istat.mode & ~ALL_MODES) | (*mode & ALL_MODES);
  64
  65         r = vtreefs_hooks->chstat_hook(node, &istat, get_inode_cbdata(node));
  66
  67         if (r != OK)
  68                 return r;
  69
  70         get_inode_stat(node, &istat);
  71
  72         *mode = istat.mode;
  73
  74         return OK;
  75 }
  76
  77 /*
  78  * Change file ownership.
  79  */
  80 int
  81 fs_chown(ino_t ino_nr, uid_t uid, gid_t gid, mode_t * mode)
  82 {
  83         struct inode *node;
  84         struct inode_stat istat;
  85         int r;
  86
  87         if ((node = find_inode(ino_nr)) == NULL)
  88                 return EINVAL;
  89
  90         if (vtreefs_hooks->chstat_hook == NULL)
  91                 return ENOSYS;
  92
  93         get_inode_stat(node, &istat);
  94
  95         istat.uid = uid;
  96         istat.gid = gid;
  97         istat.mode &= ~(S_ISUID | S_ISGID);
  98
  99         r = vtreefs_hooks->chstat_hook(node, &istat, get_inode_cbdata(node));
 100
 101         if (r != OK)
 102                 return r;
 103
 104         get_inode_stat(node, &istat);
 105
 106         *mode = istat.mode;
 107
 108         return OK;
 109 }
 110
 111 /*
 112  * Retrieve file system statistics.
 113  */
 114 int
 115 fs_statvfs(struct statvfs * buf)
 116 {
 117
 118         buf->f_flag = ST_NOTRUNC;
 119         buf->f_namemax = NAME_MAX;
 120
 121         return OK;
 122 }