From 5753553213df8f9de851adb68377db43faecb91f Mon Sep 17 00:00:00 2001
From: Robert Morris <rtm@csail.mit.edu>
Date: Tue, 11 Jun 2019 09:57:14 -0400
Subject: separate source into kernel/ user/ mkfs/

---
 file.c | 175 -----------------------------------------------------------------
 1 file changed, 175 deletions(-)
 delete mode 100644 file.c

(limited to 'file.c')

diff --git a/file.c b/file.c
deleted file mode 100644
index 6f27f22..0000000
--- a/file.c
+++ /dev/null
@@ -1,175 +0,0 @@
-//
-// Support functions for system calls that involve file descriptors.
-//
-
-#include "types.h"
-#include "riscv.h"
-#include "defs.h"
-#include "param.h"
-#include "fs.h"
-#include "spinlock.h"
-#include "sleeplock.h"
-#include "file.h"
-#include "stat.h"
-#include "proc.h"
-
-struct devsw devsw[NDEV];
-struct {
-  struct spinlock lock;
-  struct file file[NFILE];
-} ftable;
-
-void
-fileinit(void)
-{
-  initlock(&ftable.lock, "ftable");
-}
-
-// Allocate a file structure.
-struct file*
-filealloc(void)
-{
-  struct file *f;
-
-  acquire(&ftable.lock);
-  for(f = ftable.file; f < ftable.file + NFILE; f++){
-    if(f->ref == 0){
-      f->ref = 1;
-      release(&ftable.lock);
-      return f;
-    }
-  }
-  release(&ftable.lock);
-  return 0;
-}
-
-// Increment ref count for file f.
-struct file*
-filedup(struct file *f)
-{
-  acquire(&ftable.lock);
-  if(f->ref < 1)
-    panic("filedup");
-  f->ref++;
-  release(&ftable.lock);
-  return f;
-}
-
-// Close file f.  (Decrement ref count, close when reaches 0.)
-void
-fileclose(struct file *f)
-{
-  struct file ff;
-
-  acquire(&ftable.lock);
-  if(f->ref < 1)
-    panic("fileclose");
-  if(--f->ref > 0){
-    release(&ftable.lock);
-    return;
-  }
-  ff = *f;
-  f->ref = 0;
-  f->type = FD_NONE;
-  release(&ftable.lock);
-
-  if(ff.type == FD_PIPE)
-    pipeclose(ff.pipe, ff.writable);
-  else if(ff.type == FD_INODE){
-    begin_op();
-    iput(ff.ip);
-    end_op();
-  }
-}
-
-// Get metadata about file f.
-// addr is a user virtual address, pointing to a struct stat.
-int
-filestat(struct file *f, uint64 addr)
-{
-  struct proc *p = myproc();
-  struct stat st;
-  
-  if(f->type == FD_INODE){
-    ilock(f->ip);
-    stati(f->ip, &st);
-    iunlock(f->ip);
-    if(copyout(p->pagetable, addr, (char *)&st, sizeof(st)) < 0)
-      return -1;
-    return 0;
-  }
-  return -1;
-}
-
-// Read from file f.
-// addr is a user virtual address.
-int
-fileread(struct file *f, uint64 addr, int n)
-{
-  int r = 0;
-
-  if(f->readable == 0)
-    return -1;
-
-  if(f->type == FD_PIPE){
-    r = piperead(f->pipe, addr, n);
-  } else if(f->type == FD_INODE){
-    ilock(f->ip);
-    if((r = readi(f->ip, 1, addr, f->off, n)) > 0)
-      f->off += r;
-    iunlock(f->ip);
-  } else {
-    panic("fileread");
-  }
-
-  return r;
-}
-
-//PAGEBREAK!
-// Write to file f.
-// addr is a user virtual address.
-int
-filewrite(struct file *f, uint64 addr, int n)
-{
-  int r, ret = 0;
-
-  if(f->writable == 0)
-    return -1;
-
-  if(f->type == FD_PIPE){
-    ret = pipewrite(f->pipe, addr, n);
-  } else if(f->type == FD_INODE){
-    // write a few blocks at a time to avoid exceeding
-    // the maximum log transaction size, including
-    // i-node, indirect block, allocation blocks,
-    // and 2 blocks of slop for non-aligned writes.
-    // this really belongs lower down, since writei()
-    // might be writing a device like the console.
-    int max = ((MAXOPBLOCKS-1-1-2) / 2) * 512;
-    int i = 0;
-    while(i < n){
-      int n1 = n - i;
-      if(n1 > max)
-        n1 = max;
-
-      begin_op();
-      ilock(f->ip);
-      if ((r = writei(f->ip, 1, addr + i, f->off, n1)) > 0)
-        f->off += r;
-      iunlock(f->ip);
-      end_op();
-
-      if(r < 0)
-        break;
-      if(r != n1)
-        panic("short filewrite");
-      i += r;
-    }
-    ret = (i == n ? n : -1);
-  } else {
-    panic("filewrite");
-  }
-
-  return ret;
-}
-
-- 
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