From: Al Viro Date: Sat, 1 Nov 2014 14:57:28 +0000 (-0400) Subject: take the targets of /proc/*/ns/* symlinks to separate fs X-Git-Tag: omap-for-v3.20/drop-legacy-3517~57^2~7^2~1 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e149ed2b805fefdccf7ccdfc19eca22fdd4514ac;p=pandora-kernel.git 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 pair it gets from ns_get_path(). Signed-off-by: Al Viro --- Reading git-diff-tree failed