minix/lib/libpuffs/inode.c

   1 /*
   2  * Created (MFS based):
   3  *   June 2011 (Evgeniy Ivanov)
   4  */
   5
   6 #include "fs.h"
   7
   8 void release_node(struct puffs_usermount *pu, struct puffs_node *pn)
   9 {
  10   assert(pn->pn_count == 0);
  11
  12   /* Required if puffs_node_reclaim() decides to leave node in the list */
  13   pn->pn_mountpoint = FALSE;
  14
  15   if (pu->pu_ops.puffs_node_reclaim) {
  16         if (global_pu->pu_ops.puffs_node_reclaim(global_pu, pn) != 0)
  17                 lpuffs_debug("Warning: reclaim failed\n");
  18   } else {
  19         puffs_pn_put(pn);
  20   }
  21 }
  22
  23
  24 /*===========================================================================*
  25  *                fs_putnode                                                 *
  26  *===========================================================================*/
  27 int fs_putnode(ino_t ino_nr, unsigned int count)
  28 {
  29 /* Find the pnode specified by the request message and decrease its counter.
  30  * Release unused pnode.
  31  */
  32   struct puffs_node *pn;
  33
  34   if ((pn = puffs_pn_nodewalk(global_pu, find_inode_cb, &ino_nr)) == NULL) {
  35         /* XXX Probably removed from the list, see puffs_pn_remove() */
  36         struct puffs_node *pn_cur, *pn_next;
  37         pn_cur = LIST_FIRST(&global_pu->pu_pnode_removed_lst);
  38         while (pn_cur) {
  39                 pn_next = LIST_NEXT(pn_cur, pn_entries);
  40                 if (pn_cur->pn_va.va_fileid == ino_nr) {
  41                         pn = pn_cur;
  42                         break;
  43                 }
  44                 pn_cur = pn_next;
  45         }
  46   }
  47
  48   if (pn == NULL) {
  49         lpuffs_debug("%s:%d putnode: pnode #%"PRIu64" not found\n",
  50             __FILE__, __LINE__, ino_nr);
  51         panic("fs_putnode failed");
  52   }
  53
  54   if (count <= 0) {
  55         lpuffs_debug("%s:%d putnode: bad value for count: %d\n", __FILE__,
  56                 __LINE__, count);
  57         panic("fs_putnode failed");
  58   } else if (pn->pn_count == 0) {
  59         /* FUSE fs might store in the list pnodes, which we hasn't
  60          * open, this means we got put request for file,
  61          * which wasn't opened by VFS.
  62          */
  63         lpuffs_debug("%s:%d putnode: pn_count already zero\n", __FILE__,
  64                 __LINE__);
  65         panic("fs_putnode failed");
  66   } else if (count > pn->pn_count) {
  67         struct puffs_node *pn_cur, *pn_next;
  68         struct puffs_usermount *pu = global_pu;
  69         ino_t ino = pn->pn_va.va_fileid;
  70
  71         pn_cur = LIST_FIRST(&pu->pu_pnodelst);
  72         lpuffs_debug("inum  count  path  polen  hash\n");
  73         while (pn_cur) {
  74                 pn_next = LIST_NEXT(pn_cur, pn_entries);
  75                 if (pn_cur->pn_va.va_fileid == ino) {
  76                         lpuffs_debug("%"PRIu64": %d %s %u %u\n",
  77                                 ino,
  78                                 pn_cur->pn_count,
  79                                 (char *)pn_cur->pn_po.po_path,
  80                                 pn_cur->pn_po.po_len,
  81                                 pn_cur->pn_po.po_hash);
  82                 }
  83                 pn_cur = pn_next;
  84         }
  85         lpuffs_debug("%s:%d putnode: count too high: %d > %d\n", __FILE__,
  86                 __LINE__, count, pn->pn_count);
  87         panic("fs_putnode failed");
  88   }
  89
  90   pn->pn_count -= count;
  91
  92   if (pn->pn_count == 0)
  93         release_node(global_pu, pn);
  94
  95   return(OK);
  96 }