 ssize_t writev(struct file *file,

const struct iovec *vector,

unsigned long count,

loff_t *offset)

      writev ()    -
  ,   vector;   
count.        -
    .

 ssize_t sendfile(struct file *file,

loff_t *offset,

size t size,

read_actor_t actor,

void *target)

      sendfiie ()  
     .     -
        -
    .

 ssize t sendpage(struct file *file,
struct page *page,
int offset, size t size,
loff t *pos, int more)
          .

 unsigned long get_unmapped_area(struct file*file,
unsigned long addr,
unsigned long len,
' unsigned long offset,

unsigned long flags)

       
 .

 int check_flags(int flags)

      ,  -
    fcnti (),    SETFL.  
     VFS,     -
   check_flags ().     
  NFS.      
    SETFL    -
 fcnti ().    NFS    -
  0_APPEND  0_DIRECT.

 int flock(struct file *filp, int cmd, struct file__lock *fl)

       flock(), -
     .

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