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Commit 7c23b330 authored by Josh Poimboeuf's avatar Josh Poimboeuf Committed by Jiri Kosina
Browse files

livepatch: add /proc/<pid>/patch_state 



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

Signed-off-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: default avatarPetr Mladek <pmladek@suse.com>
Reviewed-by: default avatarMiroslav Benes <mbenes@suse.cz>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent d83a7cb3

Documentation/filesystems/proc.txt

+18 −0
Original line number Diff line number Diff line
@@ -44,6 +44,7 @@ Table of Contents 
  3.8   /proc/<pid>/fdinfo/<fd> - Information about opened file

  3.9   /proc/<pid>/map_files - Information about memory mapped files

  3.10  /proc/<pid>/timerslack_ns - Task timerslack value

  3.11	/proc/<pid>/patch_state - Livepatch patch operation state



  4	Configuring procfs

  4.1	Mount options
@@ -1887,6 +1888,23 @@ Valid values are from 0 - ULLONG_MAX 
An application setting the value must have PTRACE_MODE_ATTACH_FSCREDS level

permissions on the task specified to change its timerslack_ns value.



3.11	/proc/<pid>/patch_state - Livepatch patch operation state

-----------------------------------------------------------------

When CONFIG_LIVEPATCH is enabled, this file displays the value of the

patch state for the task.



A value of '-1' indicates that no patch is in transition.



A value of '0' indicates that a patch is in transition and the task is

unpatched.  If the patch is being enabled, then the task hasn't been

patched yet.  If the patch is being disabled, then the task has already

been unpatched.



A value of '1' indicates that a patch is in transition and the task is

patched.  If the patch is being enabled, then the task has already been

patched.  If the patch is being disabled, then the task hasn't been

unpatched yet.





------------------------------------------------------------------------------

Configuring procfs

fs/proc/base.c

+15 −0
Original line number Diff line number Diff line
@@ -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)