lib/libpuffs/mount.c

   1 /* Created (MFS based):
   2  *   June 2011 (Evgeniy Ivanov)
   3  */
   4
   5 #include "fs.h"
   6 #include <fcntl.h>
   7 #include <string.h>
   8 #include <minix/com.h>
   9 #include <sys/stat.h>
  10 #include <minix/ds.h>
  11 #include <minix/vfsif.h>
  12
  13 #include "puffs_priv.h"
  14
  15 /*===========================================================================*
  16  *                              fs_readsuper                                 *
  17  *===========================================================================*/
  18 int fs_readsuper()
  19 {
  20   struct vattr *root_va;
  21
  22   fs_dev    = fs_m_in.REQ_DEV;
  23   is_readonly_fs  = (fs_m_in.REQ_FLAGS & REQ_RDONLY) ? 1 : 0;
  24   is_root_fs    = (fs_m_in.REQ_FLAGS & REQ_ISROOT) ? 1 : 0;
  25
  26   /* Open root pnode */
  27   global_pu->pu_pn_root->pn_count = 1;
  28
  29   /* Root pnode properties */
  30   root_va = &global_pu->pu_pn_root->pn_va;
  31   fs_m_out.RES_INODE_NR = root_va->va_fileid;
  32   fs_m_out.RES_MODE = root_va->va_mode;
  33   fs_m_out.RES_FILE_SIZE_LO = root_va->va_size;
  34   fs_m_out.RES_UID = root_va->va_uid;
  35   fs_m_out.RES_GID = root_va->va_gid;
  36   fs_m_out.RES_CONREQS = 1;
  37
  38   return(OK);
  39 }
  40
  41
  42 /*===========================================================================*
  43  *                              fs_mountpoint                                *
  44  *===========================================================================*/
  45 int fs_mountpoint()
  46 {
  47 /* This function looks up the mount point, it checks the condition whether
  48  * the partition can be mounted on the pnode or not.
  49  */
  50   int r = OK;
  51   struct puffs_node *pn;
  52   mode_t bits;
  53
  54   /*
  55    * XXX: we assume that lookup was done first, so pnode can be found with
  56    * puffs_pn_nodewalk.
  57    */
  58   if ((pn = puffs_pn_nodewalk(global_pu, 0, &fs_m_in.REQ_INODE_NR)) == NULL)
  59         return(EINVAL);
  60
  61
  62   if (pn->pn_mountpoint) r = EBUSY;
  63
  64   /* It may not be special. */
  65   bits = pn->pn_va.va_mode & I_TYPE;
  66   if(bits == I_BLOCK_SPECIAL || bits == I_CHAR_SPECIAL) r = ENOTDIR;
  67
  68   if (r == OK)
  69         pn->pn_mountpoint = TRUE;
  70
  71   return(r);
  72 }
  73
  74
  75 /*===========================================================================*
  76  *                              fs_unmount                                   *
  77  *===========================================================================*/
  78 int fs_unmount()
  79 {
  80   int error;
  81
  82   /* XXX there is no information about flags, 0 should be safe enough */
  83   error = global_pu->pu_ops.puffs_fs_unmount(global_pu, 0);
  84   if (error) {
  85         /* XXX we can't return any error to VFS */
  86         lpuffs_debug("user handler failed to unmount filesystem!\
  87                 Force unmount!\n");
  88   }
  89
  90   fs_sync();
  91
  92   /* Finish off the unmount. */
  93   PU_SETSTATE(global_pu, PUFFS_STATE_UNMOUNTED);
  94   unmountdone = TRUE;
  95   global_pu->pu_pn_root->pn_count--;
  96
  97   return(OK);
  98 }