aboutsummaryrefslogtreecommitdiff
path: root/init
diff options
context:
space:
mode:
authorAl Viro <viro@zeniv.linux.org.uk>2014-11-01 10:57:28 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2014-12-10 21:30:20 -0500
commite149ed2b805fefdccf7ccdfc19eca22fdd4514ac (patch)
tree8c9cd88deff8c7309ca2acb8d4cb475aaca47b14 /init
parentf77c80142e1afe6d5c16975ca5d7d1fc324b16f9 (diff)
downloadlinux-linaro-stable-e149ed2b805fefdccf7ccdfc19eca22fdd4514ac.tar.gz
take the targets of /proc/*/ns/* symlinks to separate fs
New pseudo-filesystem: nsfs. Targets of /proc/*/ns/* live there now. It's not mountable (not even registered, so it's not in /proc/filesystems, etc.). Files on it *are* bindable - we explicitly permit that in do_loopback(). This stuff lives in fs/nsfs.c now; proc_ns_fget() moved there as well. get_proc_ns() is a macro now (it's simply returning ->i_private; would have been an inline, if not for header ordering headache). proc_ns_inode() is an ex-parrot. The interface used in procfs is ns_get_path(path, task, ops) and ns_get_name(buf, size, task, ops). Dentries and inodes are never hashed; a non-counting reference to dentry is stashed in ns_common (removed by ->d_prune()) and reused by ns_get_path() if present. See ns_get_path()/ns_prune_dentry/nsfs_evict() for details of that mechanism. As the result, proc_ns_follow_link() has stopped poking in nd->path.mnt; it does nd_jump_link() on a consistent <vfsmount,dentry> pair it gets from ns_get_path(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'init')
-rw-r--r--init/main.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/init/main.c b/init/main.c
index 800a0daede7e..bcc75057ea87 100644
--- a/init/main.c
+++ b/init/main.c
@@ -78,6 +78,7 @@
#include <linux/context_tracking.h>
#include <linux/random.h>
#include <linux/list.h>
+#include <linux/proc_ns.h>
#include <asm/io.h>
#include <asm/bugs.h>
@@ -660,6 +661,7 @@ asmlinkage __visible void __init start_kernel(void)
/* rootfs populating might need page-writeback */
page_writeback_init();
proc_root_init();
+ nsfs_init();
cgroup_init();
cpuset_init();
taskstats_init_early();