Replace pid_t in autofs with struct pid reference

Make autofs container-friendly by caching struct pid reference rather than
pid_t and using pid_nr() to retreive a task's pid_t.

ChangeLog:
	- Fix Eric Biederman's comments - Use find_get_pid() to hold a
	  reference to oz_pgrp and release while unmounting; separate out
	  changes to autofs and autofs4.
	- Fix Cedric's comments: retain old prototype of parse_options()
	  and move necessary change to its caller.

Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Serge Hallyn <serue@us.ibm.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: containers@lists.osdl.org
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/fs/autofs/root.c b/fs/autofs/root.c
index 6fa04dd6d167..c1489533277a 100644
--- a/fs/autofs/root.c
+++ b/fs/autofs/root.c
@@ -213,8 +213,10 @@ static struct dentry *autofs_root_lookup(struct inode *dir, struct dentry *dentr
         sbi = autofs_sbi(dir->i_sb);
 
         oz_mode = autofs_oz_mode(sbi);
-        DPRINTK(("autofs_lookup: pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d\n",
-                 current->pid, process_group(current), sbi->catatonic, oz_mode));
+        DPRINTK(("autofs_lookup: pid = %u, pgrp = %u, catatonic = %d, "
+                                "oz_mode = %d\n", pid_nr(task_pid(current)),
+                                process_group(current), sbi->catatonic,
+                                oz_mode));
 
         /*
          * Mark the dentry incomplete, but add it. This is needed so