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(void)
  19 {
  20   struct vattr *root_va;
  21
  22   fs_dev    = fs_m_in.m_vfs_fs_readsuper.device;
  23   is_readonly_fs  = (fs_m_in.m_vfs_fs_readsuper.flags & REQ_RDONLY) ? 1 : 0;
  24   is_root_fs    = (fs_m_in.m_vfs_fs_readsuper.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.m_fs_vfs_readsuper.inode = root_va->va_fileid;
  32   fs_m_out.m_fs_vfs_readsuper.mode = root_va->va_mode;
  33   fs_m_out.m_fs_vfs_readsuper.file_size = root_va->va_size;
  34   fs_m_out.m_fs_vfs_readsuper.uid = root_va->va_uid;
  35   fs_m_out.m_fs_vfs_readsuper.gid = root_va->va_gid;
  36   fs_m_out.m_fs_vfs_readsuper.flags = RES_NOFLAGS;
  37
  38   return(OK);
  39 }
  40
  41
  42 /*===========================================================================*
  43  *                              fs_mountpoint                                *
  44  *===========================================================================*/
  45 int fs_mountpoint(void)
  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.m_vfs_fs_mountpoint.inode))
  59           == NULL)
  60         return(EINVAL);
  61
  62
  63   if (pn->pn_mountpoint) r = EBUSY;
  64
  65   /* It may not be special. */
  66   bits = pn->pn_va.va_mode & I_TYPE;
  67   if(bits == I_BLOCK_SPECIAL || bits == I_CHAR_SPECIAL) r = ENOTDIR;
  68
  69   if (r == OK)
  70         pn->pn_mountpoint = TRUE;
  71
  72   return(r);
  73 }
  74
  75
  76 /*===========================================================================*
  77  *                              fs_unmount                                   *
  78  *===========================================================================*/
  79 int fs_unmount(void)
  80 {
  81   int error;
  82
  83   /* XXX there is no information about flags, 0 should be safe enough */
  84   error = global_pu->pu_ops.puffs_fs_unmount(global_pu, 0);
  85   if (error) {
  86         /* XXX we can't return any error to VFS */
  87         lpuffs_debug("user handler failed to unmount filesystem!\
  88                 Force unmount!\n");
  89   }
  90
  91   fs_sync();
  92
  93   /* Finish off the unmount. */
  94   PU_SETSTATE(global_pu, PUFFS_STATE_UNMOUNTED);
  95   unmountdone = TRUE;
  96   global_pu->pu_pn_root->pn_count--;
  97
  98   return(OK);
  99 }