[PATCH 17/23] proc: Give the root directory a task.

[Eric W. Biederman]

Helper functions in base.c like proc_pident_readdir and proc_pident_lookup
assume the directories have an associated task, and cannot currently be used on
the /proc root directory because it does not have such a task.

This small changes allows for base.c to be simplified and later when multiple
pid spaces are introduced it makes getting the needed context information trivial.

Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>


---

 fs/proc/root.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

516b38bf721663deded53591272bdfc8f032f885
diff --git a/fs/proc/root.c b/fs/proc/root.c
index c3fd361..a3ceff3 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/bitops.h>
 #include <linux/smp_lock.h>
+#include <linux/mount.h>
 
 #include "internal.h"
 
@@ -29,6 +30,18 @@ struct proc_dir_entry *proc_sys_root;
 static struct super_block *proc_get_sb(struct file_system_type *fs_type,
 	int flags, const char *dev_name, void *data)
 {
+	if (proc_mnt) {
+		/* Seed the root directory with a task so it doesn't need
+		 * to be special in base.c.  I would do this earlier but
+		 * the only task alive when /proc is mounted the first time
+		 * is the init_task and it is never considered alive.
+		 */
+		struct proc_inode *ei;
+		ei = PROC_I(proc_mnt->mnt_sb->s_root->d_inode);
+		if (!ei->tref->task)
+			tref_set(&ei->tref,
+				tref_get_by_pid(1, PIDTYPE_PID));
+	}
 	return get_sb_single(fs_type, flags, data, proc_fill_super);
 }
 
-- 
1.2.2.g709a

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