patch-2.3.99-pre6 linux/kernel/fork.c

• Lines: 84
• Date: Fri Apr 21 16:08:45 2000
• Orig file: v2.3.99-pre5/linux/kernel/fork.c
• Orig date: Tue Apr 11 15:09:25 2000

diff -u --recursive --new-file v2.3.99-pre5/linux/kernel/fork.c linux/kernel/fork.c
@@ -11,6 +11,7 @@
  * management can be a bitch. See 'mm/mm.c': 'copy_page_tables()'
  */
 
+#include <linux/config.h>
 #include <linux/malloc.h>
 #include <linux/init.h>
 #include <linux/unistd.h>
@@ -98,7 +99,7 @@
  * the common case (not freeing anything) without having
  * any locking.
  */
-#ifdef __SMP__
+#ifdef CONFIG_SMP
   #define uid_hash_free(up)	(!atomic_read(&(up)->count))
 #else
   #define uid_hash_free(up)	(1)
@@ -242,6 +243,8 @@
 		struct file *file;
 
 		retval = -ENOMEM;
+		if(mpnt->vm_flags & VM_DONTCOPY)
+			continue;
 		tmp = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
 		if (!tmp)
 			goto fail_nomem;
@@ -419,21 +422,41 @@
 	return retval;
 }
 
+static inline struct fs_struct *__copy_fs_struct(struct fs_struct *old)
+{
+	struct fs_struct *fs = kmalloc(sizeof(*old), GFP_KERNEL);
+	if (fs) {
+		atomic_set(&fs->count, 1);
+		fs->umask = old->umask;
+		fs->rootmnt = mntget(old->rootmnt);
+		fs->root = dget(old->root);
+		fs->pwdmnt = mntget(old->pwdmnt);
+		fs->pwd = dget(old->pwd);
+		if (old->altroot) {
+			fs->altrootmnt = mntget(old->altrootmnt);
+			fs->altroot = dget(old->altroot);
+		} else {
+			fs->altrootmnt = NULL;
+			fs->altroot = NULL;
+		}	
+	}
+	return fs;
+}
+
+struct fs_struct *copy_fs_struct(struct fs_struct *old)
+{
+	return __copy_fs_struct(old);
+}
+
 static inline int copy_fs(unsigned long clone_flags, struct task_struct * tsk)
 {
 	if (clone_flags & CLONE_FS) {
 		atomic_inc(&current->fs->count);
 		return 0;
 	}
-	tsk->fs = kmalloc(sizeof(*tsk->fs), GFP_KERNEL);
+	tsk->fs = __copy_fs_struct(current->fs);
 	if (!tsk->fs)
 		return -1;
-	atomic_set(&tsk->fs->count, 1);
-	tsk->fs->umask = current->fs->umask;
-	tsk->fs->root = dget(current->fs->root);
-	tsk->fs->pwd = dget(current->fs->pwd);
-	tsk->fs->rootmnt = mntget(current->fs->rootmnt);
-	tsk->fs->pwdmnt = mntget(current->fs->pwdmnt);
 	return 0;
 }
 
@@ -673,7 +696,7 @@
 	p->tty_old_pgrp = 0;
 	p->times.tms_utime = p->times.tms_stime = 0;
 	p->times.tms_cutime = p->times.tms_cstime = 0;
-#ifdef __SMP__
+#ifdef CONFIG_SMP
 	{
 		int i;
 		p->has_cpu = 0;