From 02afc6267f6d55d47aba9fcafdbd1b7230d2294a Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 8 May 2008 19:42:56 -0400
Subject: [PATCH] dup_fd() fixes, part 1

Move the sucker to fs/file.c in preparation to the rest

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 kernel/fork.c | 130 ----------------------------------------------------------
 1 file changed, 130 deletions(-)

(limited to 'kernel/fork.c')

diff --git a/kernel/fork.c b/kernel/fork.c
index 933e60ebccae..19908b26cf80 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -660,136 +660,6 @@ static int copy_fs(unsigned long clone_flags, struct task_struct *tsk)
 	return 0;
 }
 
-static int count_open_files(struct fdtable *fdt)
-{
-	int size = fdt->max_fds;
-	int i;
-
-	/* Find the last open fd */
-	for (i = size/(8*sizeof(long)); i > 0; ) {
-		if (fdt->open_fds->fds_bits[--i])
-			break;
-	}
-	i = (i+1) * 8 * sizeof(long);
-	return i;
-}
-
-static struct files_struct *alloc_files(void)
-{
-	struct files_struct *newf;
-	struct fdtable *fdt;
-
-	newf = kmem_cache_alloc(files_cachep, GFP_KERNEL);
-	if (!newf)
-		goto out;
-
-	atomic_set(&newf->count, 1);
-
-	spin_lock_init(&newf->file_lock);
-	newf->next_fd = 0;
-	fdt = &newf->fdtab;
-	fdt->max_fds = NR_OPEN_DEFAULT;
-	fdt->close_on_exec = (fd_set *)&newf->close_on_exec_init;
-	fdt->open_fds = (fd_set *)&newf->open_fds_init;
-	fdt->fd = &newf->fd_array[0];
-	INIT_RCU_HEAD(&fdt->rcu);
-	fdt->next = NULL;
-	rcu_assign_pointer(newf->fdt, fdt);
-out:
-	return newf;
-}
-
-/*
- * Allocate a new files structure and copy contents from the
- * passed in files structure.
- * errorp will be valid only when the returned files_struct is NULL.
- */
-static struct files_struct *dup_fd(struct files_struct *oldf, int *errorp)
-{
-	struct files_struct *newf;
-	struct file **old_fds, **new_fds;
-	int open_files, size, i;
-	struct fdtable *old_fdt, *new_fdt;
-
-	*errorp = -ENOMEM;
-	newf = alloc_files();
-	if (!newf)
-		goto out;
-
-	spin_lock(&oldf->file_lock);
-	old_fdt = files_fdtable(oldf);
-	new_fdt = files_fdtable(newf);
-	open_files = count_open_files(old_fdt);
-
-	/*
-	 * Check whether we need to allocate a larger fd array and fd set.
-	 * Note: we're not a clone task, so the open count won't change.
-	 */
-	if (open_files > new_fdt->max_fds) {
-		new_fdt->max_fds = 0;
-		spin_unlock(&oldf->file_lock);
-		spin_lock(&newf->file_lock);
-		*errorp = expand_files(newf, open_files-1);
-		spin_unlock(&newf->file_lock);
-		if (*errorp < 0)
-			goto out_release;
-		new_fdt = files_fdtable(newf);
-		/*
-		 * Reacquire the oldf lock and a pointer to its fd table
-		 * who knows it may have a new bigger fd table. We need
-		 * the latest pointer.
-		 */
-		spin_lock(&oldf->file_lock);
-		old_fdt = files_fdtable(oldf);
-	}
-
-	old_fds = old_fdt->fd;
-	new_fds = new_fdt->fd;
-
-	memcpy(new_fdt->open_fds->fds_bits,
-		old_fdt->open_fds->fds_bits, open_files/8);
-	memcpy(new_fdt->close_on_exec->fds_bits,
-		old_fdt->close_on_exec->fds_bits, open_files/8);
-
-	for (i = open_files; i != 0; i--) {
-		struct file *f = *old_fds++;
-		if (f) {
-			get_file(f);
-		} else {
-			/*
-			 * The fd may be claimed in the fd bitmap but not yet
-			 * instantiated in the files array if a sibling thread
-			 * is partway through open().  So make sure that this
-			 * fd is available to the new process.
-			 */
-			FD_CLR(open_files - i, new_fdt->open_fds);
-		}
-		rcu_assign_pointer(*new_fds++, f);
-	}
-	spin_unlock(&oldf->file_lock);
-
-	/* compute the remainder to be cleared */
-	size = (new_fdt->max_fds - open_files) * sizeof(struct file *);
-
-	/* This is long word aligned thus could use a optimized version */
-	memset(new_fds, 0, size);
-
-	if (new_fdt->max_fds > open_files) {
-		int left = (new_fdt->max_fds-open_files)/8;
-		int start = open_files / (8 * sizeof(unsigned long));
-
-		memset(&new_fdt->open_fds->fds_bits[start], 0, left);
-		memset(&new_fdt->close_on_exec->fds_bits[start], 0, left);
-	}
-
-	return newf;
-
-out_release:
-	kmem_cache_free(files_cachep, newf);
-out:
-	return NULL;
-}
-
 static int copy_files(unsigned long clone_flags, struct task_struct * tsk)
 {
 	struct files_struct *oldf, *newf;
-- 
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