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authorAl Viro <viro@zeniv.linux.org.uk>2014-11-01 17:57:28 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2014-12-11 05:30:20 +0300
commite149ed2b805fefdccf7ccdfc19eca22fdd4514ac (patch)
tree8c9cd88deff8c7309ca2acb8d4cb475aaca47b14 /include/linux/ns_common.h
parentf77c80142e1afe6d5c16975ca5d7d1fc324b16f9 (diff)
downloadlinux-e149ed2b805fefdccf7ccdfc19eca22fdd4514ac.tar.xz
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 'include/linux/ns_common.h')
-rw-r--r--include/linux/ns_common.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/ns_common.h b/include/linux/ns_common.h
index ce23cf4bbe69..85a5c8c16be9 100644
--- a/include/linux/ns_common.h
+++ b/include/linux/ns_common.h
@@ -4,6 +4,7 @@
struct proc_ns_operations;
struct ns_common {
+ atomic_long_t stashed;
const struct proc_ns_operations *ops;
unsigned int inum;
};