servers/pfs/stadir.c

   1 #include "fs.h"
   2 #include "inode.h"
   3 #include <string.h>
   4 #include <sys/stat.h>
   5
   6
   7 /*===========================================================================*
   8  *                              stat_inode                                   *
   9  *===========================================================================*/
  10 static int stat_inode(
  11   register struct inode *rip,   /* pointer to inode to stat */
  12   endpoint_t who_e,             /* Caller endpoint */
  13   cp_grant_id_t gid             /* grant for the stat buf */
  14 )
  15 {
  16 /* Common code for stat and fstat system calls. */
  17   mode_t type;
  18   struct stat statbuf;
  19   u32_t blocks; /* The unit of this is 512 */
  20   int r, s;
  21
  22   type = rip->i_mode & I_TYPE;
  23   s = (type == I_CHAR_SPECIAL || type == I_BLOCK_SPECIAL);
  24
  25   /* Update the atime, ctime, and mtime fields in the inode, if need be. */
  26   if (rip->i_update) update_times(rip);
  27
  28   blocks = rip->i_size / S_BLKSIZE;
  29   if (rip->i_size % S_BLKSIZE != 0)
  30         blocks += 1;
  31
  32   memset(&statbuf, 0, sizeof(struct stat));
  33
  34   statbuf.st_dev = rip->i_dev;
  35   statbuf.st_ino = rip->i_num;
  36   statbuf.st_mode = rip->i_mode;
  37   statbuf.st_nlink = rip->i_nlinks;
  38   statbuf.st_uid = rip->i_uid;
  39   statbuf.st_gid = (short int) rip->i_gid;
  40   statbuf.st_rdev = (dev_t) (s ? rip->i_rdev : NO_DEV);
  41   statbuf.st_size = rip->i_size;
  42   if (!s)  statbuf.st_mode &= ~I_REGULAR;/* wipe out I_REGULAR bit for pipes */
  43   statbuf.st_atime = rip->i_atime;
  44   statbuf.st_mtime = rip->i_mtime;
  45   statbuf.st_ctime = rip->i_ctime;
  46   statbuf.st_blksize = PIPE_BUF;
  47   statbuf.st_blocks = blocks;
  48
  49   /* Copy the struct to user space. */
  50   r = sys_safecopyto(who_e, gid, (vir_bytes) 0, (vir_bytes) &statbuf,
  51                 (size_t) sizeof(statbuf));
  52
  53   return(r);
  54 }
  55
  56
  57 /*===========================================================================*
  58  *                             fs_stat                                       *
  59  *===========================================================================*/
  60 int fs_stat(message *fs_m_in, message *fs_m_out)
  61 {
  62   register int r;              /* return value */
  63   register struct inode *rip;  /* target inode */
  64
  65   if( (rip = find_inode(fs_m_in->REQ_INODE_NR)) == NULL) return(EINVAL);
  66   get_inode(rip->i_dev, rip->i_num);    /* mark inode in use */
  67   r = stat_inode(rip, fs_m_in->m_source, (cp_grant_id_t) fs_m_in->REQ_GRANT);
  68   put_inode(rip);                       /* release the inode */
  69   return(r);
  70 }