servers/pfs/stadir.c

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