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Subject[RFC PATCH v1.9 13/14] livepatch: add /proc/<pid>/patch_status
Date
Expose the per-task klp_universe value so users can determine which
tasks are holding up completion of a patching operation.

Call it "patch_status" rather than "universe": it's at least more
descriptive for the average user.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
---
fs/proc/base.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index b1755b2..f90998b 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2801,6 +2801,15 @@ static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
return err;
}

+#ifdef CONFIG_LIVEPATCH
+static int proc_pid_patch_status(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
+{
+ seq_printf(m, "%d\n", task->klp_universe);
+ return 0;
+}
+#endif /* CONFIG_LIVEPATCH */
+
/*
* Thread groups
*/
@@ -2900,6 +2909,9 @@ static const struct pid_entry tgid_base_stuff[] = {
REG("timers", S_IRUGO, proc_timers_operations),
#endif
REG("timerslack_ns", S_IRUGO|S_IWUGO, proc_pid_set_timerslack_ns_operations),
+#ifdef CONFIG_LIVEPATCH
+ ONE("patch_status", S_IRUSR, proc_pid_patch_status),
+#endif
};

static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx)
--
2.4.3
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