[PATCH] Remove f_error field from struct file

The following patch removes the f_error field and all checks of f_error.

Trond said:

  f_error was introduced for NFS, and made sense when we were guaranteed
  always to have a file pointer around when write errors occurred.  Since
  then, we have (for various reasons) had to introduce the nfs_open_context in
  order to track the file read/write state, and it made sense to move our
  f_error tracking there too.
Signed-off-by: Christoph Lameter <christoph@lameter.com>
Acked-by: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/nfs/direct.c

@@ -751,11 +751,6 @@ nfs_file_direct_write(struct kiocb *iocb, const char __user *buf, size_t count,
 	retval = -EFAULT;
 	if (!access_ok(VERIFY_READ, iov.iov_base, iov.iov_len))
 		goto out;
-        if (file->f_error) {
-                retval = file->f_error;
-                file->f_error = 0;
-                goto out;
-        }
 	retval = -EFBIG;
 	if (limit != RLIM_INFINITY) {
 		if (pos >= limit) {

fs/open.c

@@ -981,23 +981,15 @@ asmlinkage long sys_creat(const char __user * pathname, int mode)
  */
 int filp_close(struct file *filp, fl_owner_t id)
 {
-	int retval;
-
-	/* Report and clear outstanding errors */
-	retval = filp->f_error;
-	if (retval)
-		filp->f_error = 0;
+	int retval = 0;
 
 	if (!file_count(filp)) {
 		printk(KERN_ERR "VFS: Close: file count is 0\n");
-		return retval;
+		return 0;
 	}
 
-	if (filp->f_op && filp->f_op->flush) {
-		int err = filp->f_op->flush(filp);
-		if (!retval)
-			retval = err;
-	}
+	if (filp->f_op && filp->f_op->flush)
+		retval = filp->f_op->flush(filp);
 
 	dnotify_flush(filp, id);
 	locks_remove_posix(filp, id);

include/linux/fs.h

@@ -581,7 +581,6 @@ struct file {
 	atomic_t		f_count;
 	unsigned int 		f_flags;
 	mode_t			f_mode;
-	int			f_error;
 	loff_t			f_pos;
 	struct fown_struct	f_owner;
 	unsigned int		f_uid, f_gid;

mm/filemap.c

@@ -1827,12 +1827,6 @@ inline int generic_write_checks(struct file *file, loff_t *pos, size_t *count, i
         if (unlikely(*pos < 0))
                 return -EINVAL;
 
-        if (unlikely(file->f_error)) {
-                int err = file->f_error;
-                file->f_error = 0;
-                return err;
-        }
-
 	if (!isblk) {
 		/* FIXME: this is for backwards compatibility with 2.4 */
 		if (file->f_flags & O_APPEND)