  

          -
:  (used),  (unused)   (negative).

      (.. 
d_inode      mode)     
 (..   d_count   ).   -
   VFS,      ,
    .

   dentry    inode
( d_inode     ),   VFS  -
       ( d_count  
).        ,   -
  ,    .     -
,        ,    
 ,       .    -
  ,        ,
     .

  dentry6       (
d_inode   NULL),       , 
     .   
 ,         .
   dentry  ,      -
,        .

 dentry   ,     , 
   .           
VFS,     .

  dentry

    VFS   ,   
      ,     , 
         -
.       ,   dcache.

  dentry    .

  ""  dentry,    
  ( i_dentry  inode).  
     ,    
  dentry,     .

       dentry " -
  " (last recently used, LRU).  
     ,  ,  -
   ,   .     
   ,       ,

     .        -
.    , ,  invalid dentry   
.

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