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[PATCH] namespaces: add nsproxy

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This patch adds a nsproxy structure to the task struct.  Later patches will
move the fs namespace pointer into this structure, and introduce a new utsname
namespace into the nsproxy.

The vserver and openvz functionality, then, would be implemented in large part
by virtualizing/isolating more and more resources into namespaces, each
contained in the nsproxy.

[akpm@osdl.org: build fix]
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Cc: Kirill Korotaev <dev@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Andrey Savochkin <saw@sw.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Serge E. Hallyn 2006-10-02 02:18:06 -07:00 • committed by Linus Torvalds
parent b1ba4ddde0
commit ab516013ad
27 changed files with 196 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

18
kernel/fork.c
View file

@ -27,6 +27,7 @@
#include <linux/binfmts.h>
#include <linux/mman.h>
#include <linux/fs.h>
#include <linux/nsproxy.h>
#include <linux/capability.h>
#include <linux/cpu.h>
#include <linux/cpuset.h>
@ -1116,8 +1117,10 @@ static struct task_struct *copy_process(unsigned long clone_flags,
goto bad_fork_cleanup_signal;
if ((retval = copy_keys(clone_flags, p)))
goto bad_fork_cleanup_mm;
if ((retval = copy_namespace(clone_flags, p)))
if ((retval = copy_namespaces(clone_flags, p)))
goto bad_fork_cleanup_keys;
if ((retval = copy_namespace(clone_flags, p)))
goto bad_fork_cleanup_namespaces;
retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs);
if (retval)
goto bad_fork_cleanup_namespace;
@ -1262,6 +1265,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
bad_fork_cleanup_namespace:
exit_namespace(p);
bad_fork_cleanup_namespaces:
exit_task_namespaces(p);
bad_fork_cleanup_keys:
exit_keys(p);
bad_fork_cleanup_mm:
@ -1606,6 +1611,7 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
struct mm_struct *mm, *new_mm = NULL, *active_mm = NULL;
struct files_struct *fd, *new_fd = NULL;
struct sem_undo_list *new_ulist = NULL;
struct nsproxy *new_nsproxy, *old_nsproxy;
check_unshare_flags(&unshare_flags);
@ -1632,7 +1638,15 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
if (new_fs || new_ns || new_sigh || new_mm || new_fd || new_ulist) {
old_nsproxy = current->nsproxy;
new_nsproxy = dup_namespaces(old_nsproxy);
if (!new_nsproxy) {
err = -ENOMEM;
goto bad_unshare_cleanup_semundo;
}
task_lock(current);
current->nsproxy = new_nsproxy;
if (new_fs) {
fs = current->fs;
@ -1668,8 +1682,10 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
}
task_unlock(current);
put_nsproxy(old_nsproxy);
}
bad_unshare_cleanup_semundo:
bad_unshare_cleanup_fd:
if (new_fd)
put_files_struct(new_fd);