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livepatch: add /proc/<pid>/patch_state

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Expose the per-task patch state value so users can determine which tasks
are holding up completion of a patching operation.

Signed-off-by: Josh Poimboeuf <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Reviewed-by: Miroslav Benes <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
This commit is contained in:
Josh Poimboeuf 2017-02-13 19:42:41 -06:00 • committed by Jiri Kosina
commit 7c23b33001
2 changed files with 33 additions and 0 deletions
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15
fs/proc/base.c
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@ -2834,6 +2834,15 @@ static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
return err;
}
#ifdef CONFIG_LIVEPATCH
static int proc_pid_patch_state(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task)
{
seq_printf(m, "%d\n", task->patch_state);
return 0;
}
#endif /* CONFIG_LIVEPATCH */
/*
* Thread groups
*/
@ -2933,6 +2942,9 @@ 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_state", S_IRUSR, proc_pid_patch_state),
#endif
};
static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx)
@ -3315,6 +3327,9 @@ static const struct pid_entry tid_base_stuff[] = {
REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations),
REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations),
#endif
#ifdef CONFIG_LIVEPATCH
ONE("patch_state", S_IRUSR, proc_pid_patch_state),
#endif
};
static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx)