lib/libvtreefs/stadir.c

   1 /* VTreeFS - stadir.c - by Alen Stojanov and David van Moolenbroek */
   2
   3 #include "inc.h"
   4
   5 #include <time.h>
   6 #include <sys/statfs.h>
   7 #include <sys/statvfs.h>
   8 #include <string.h>
   9
  10 /*===========================================================================*
  11  *                              fs_stat                                      *
  12  *===========================================================================*/
  13 int fs_stat(void)
  14 {
  15         /* Retrieve file status.
  16          */
  17         char path[PATH_MAX];
  18         struct stat statbuf;
  19         time_t cur_time;
  20         struct inode *node;
  21         int r;
  22
  23         if ((node = find_inode(fs_m_in.REQ_INODE_NR)) == NULL)
  24                 return EINVAL;
  25
  26         memset(&statbuf, 0, sizeof(struct stat));
  27
  28         /* Fill in the basic info. */
  29         statbuf.st_dev = fs_dev;
  30         statbuf.st_ino = get_inode_number(node);
  31         statbuf.st_mode = node->i_stat.mode;
  32         statbuf.st_nlink = !is_inode_deleted(node);
  33         statbuf.st_uid = node->i_stat.uid;
  34         statbuf.st_gid = node->i_stat.gid;
  35         statbuf.st_rdev = (dev_t) node->i_stat.dev;
  36         statbuf.st_size = node->i_stat.size;
  37
  38         /* If it is a symbolic link, return the size of the link target. */
  39         if (S_ISLNK(node->i_stat.mode) && vtreefs_hooks->rdlink_hook != NULL) {
  40                 r = vtreefs_hooks->rdlink_hook(node, path, sizeof(path),
  41                         get_inode_cbdata(node));
  42
  43                 if (r == OK)
  44                         statbuf.st_size = strlen(path);
  45         }
  46
  47         /* Take the current time as file time for all files. */
  48         cur_time = time(NULL);
  49         statbuf.st_atime = cur_time;
  50         statbuf.st_mtime = cur_time;
  51         statbuf.st_ctime = cur_time;
  52
  53         /* Copy the struct to user space. */
  54         return sys_safecopyto(fs_m_in.m_source, fs_m_in.REQ_GRANT, 0,
  55                 (vir_bytes) &statbuf, (phys_bytes) sizeof(statbuf));
  56 }
  57
  58 /*===========================================================================*
  59  *                              fs_fstatfs                                   *
  60  *===========================================================================*/
  61 int fs_fstatfs(void)
  62 {
  63         /* Retrieve file system statistics.
  64          */
  65         struct statfs statfs;
  66
  67         memset(&statfs, 0, sizeof(statfs));
  68
  69         /* Copy the struct to user space. */
  70         return sys_safecopyto(fs_m_in.m_source, fs_m_in.REQ_GRANT, 0,
  71                 (vir_bytes) &statfs, (phys_bytes) sizeof(statfs));
  72 }
  73
  74 /*===========================================================================*
  75  *                              fs_fstatfs                                   *
  76  *===========================================================================*/
  77 int fs_statvfs(void)
  78 {
  79         /* Retrieve file system statistics.
  80          */
  81         struct statvfs statvfs;
  82
  83         memset(&statvfs, 0, sizeof(statvfs));
  84
  85         statvfs.f_fsid = fs_dev;
  86         statvfs.f_flag = ST_RDONLY | ST_NOTRUNC;
  87         statvfs.f_namemax = PNAME_MAX;
  88
  89         return sys_safecopyto(fs_m_in.m_source, fs_m_in.REQ_GRANT, 0,
  90                 (vir_bytes) &statvfs, sizeof(statvfs));
  91 }