mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 21:38:32 +08:00
498052bba5
* all changes of current->fs are done under task_lock and write_lock of old fs->lock * refcount is not atomic anymore (same protection) * its decrements are done when removing reference from current; at the same time we decide whether to free it. * put_fs_struct() is gone * new field - ->in_exec. Set by check_unsafe_exec() if we are trying to do execve() and only subthreads share fs_struct. Cleared when finishing exec (success and failure alike). Makes CLONE_FS fail with -EAGAIN if set. * check_unsafe_exec() may fail with -EAGAIN if another execve() from subthread is in progress. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/* fs/ internal definitions
|
|
*
|
|
* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
struct super_block;
|
|
struct linux_binprm;
|
|
struct path;
|
|
|
|
/*
|
|
* block_dev.c
|
|
*/
|
|
#ifdef CONFIG_BLOCK
|
|
extern struct super_block *blockdev_superblock;
|
|
extern void __init bdev_cache_init(void);
|
|
|
|
static inline int sb_is_blkdev_sb(struct super_block *sb)
|
|
{
|
|
return sb == blockdev_superblock;
|
|
}
|
|
|
|
#else
|
|
static inline void bdev_cache_init(void)
|
|
{
|
|
}
|
|
|
|
static inline int sb_is_blkdev_sb(struct super_block *sb)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* char_dev.c
|
|
*/
|
|
extern void __init chrdev_init(void);
|
|
|
|
/*
|
|
* exec.c
|
|
*/
|
|
extern int check_unsafe_exec(struct linux_binprm *);
|
|
|
|
/*
|
|
* namespace.c
|
|
*/
|
|
extern int copy_mount_options(const void __user *, unsigned long *);
|
|
|
|
extern void free_vfsmnt(struct vfsmount *);
|
|
extern struct vfsmount *alloc_vfsmnt(const char *);
|
|
extern struct vfsmount *__lookup_mnt(struct vfsmount *, struct dentry *, int);
|
|
extern void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
|
|
struct vfsmount *);
|
|
extern void release_mounts(struct list_head *);
|
|
extern void umount_tree(struct vfsmount *, int, struct list_head *);
|
|
extern struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int);
|
|
|
|
extern void __init mnt_init(void);
|
|
|
|
/*
|
|
* fs_struct.c
|
|
*/
|
|
extern void chroot_fs_refs(struct path *, struct path *);
|