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Subject[PATCH 3/7] proc: Give the root directory a task.
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 <>
fs/proc/root.c | 12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/fs/proc/root.c b/fs/proc/root.c
index 8901c65..ffe66c3 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -16,6 +16,7 @@ #include <linux/init.h>
#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/smp_lock.h>
+#include <linux/mount.h>

#include "internal.h"

@@ -28,6 +29,17 @@ #endif
static int proc_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
+ if (proc_mnt) {
+ /* Seed the root directory with a pid 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 doesn't have any pids.
+ */
+ struct proc_inode *ei;
+ ei = PROC_I(proc_mnt->mnt_sb->s_root->d_inode);
+ if (!ei->pid)
+ ei->pid = find_get_pid(1);
+ }
return get_sb_single(fs_type, flags, data, proc_fill_super, mnt);

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