The patch titled
pid: implement access helpers for a tacks various process groups
has been added to the -mm tree. Its filename is
pid-implement-access-helpers-for-a-tacks-various-process-groups.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: pid: implement access helpers for a tacks various process groups
From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
In the last round of cleaning up the pid hash table a more general struct pid
was introduced, that can be referenced counted.
With the more general struct pid most if not all places where we store a pid_t
we can now store a struct pid * and remove the need for a hash table lookup,
and avoid any possible problems with pid roll over.
Looking forward to the pid namespaces struct pid * gives us an absolute form a
pid so we can compare and use them without caring which pid namespace we are
in.
This patchset introduces the infrastructure needed to use struct pid instead
of pid_t, and then it goes on to convert two different kernel users that
currently store a pid_t value.
There are a lot more places to go but this is enough to get the basic idea.
Before we can merge a pid namespace patch all of the kernel pid_t users need
to be examined. Those that deal with user space processes need to be
converted to using a struct pid *. Those that deal with kernel processes need
to converted to using the kthread api. A rare few that only use their current
processes pid values get to be left alone.
This patch:
task_session returns the struct pid of a tasks session.
task_pgrp returns the struct pid of a tasks process group.
task_tgid returns the struct pid of a tasks thread group.
task_pid returns the struct pid of a tasks process id.
These can be used to avoid unnecessary hash table lookups, and to implement
safe pid comparisions in the face of a pid namespace.
Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/linux/sched.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff -puN include/linux/sched.h~pid-implement-access-helpers-for-a-tacks-various-process-groups include/linux/sched.h
--- a/include/linux/sched.h~pid-implement-access-helpers-for-a-tacks-various-process-groups
+++ a/include/linux/sched.h
@@ -1016,6 +1016,26 @@ static inline pid_t process_group(struct
return tsk->signal->pgrp;
}
+static inline struct pid *task_pid(struct task_struct *task)
+{
+ return task->pids[PIDTYPE_PID].pid;
+}
+
+static inline struct pid *task_tgid(struct task_struct *task)
+{
+ return task->group_leader->pids[PIDTYPE_PID].pid;
+}
+
+static inline struct pid *task_pgrp(struct task_struct *task)
+{
+ return task->group_leader->pids[PIDTYPE_PGID].pid;
+}
+
+static inline struct pid *task_session(struct task_struct *task)
+{
+ return task->group_leader->pids[PIDTYPE_SID].pid;
+}
+
/**
* pid_alive - check that a task structure is not stale
* @p: Task structure to be checked.
_
Patches currently in -mm which might be from ebiederm@xxxxxxxxxxxx are
megaraid-use-the-proper-type-to-hold-the-irq-number.patch
x86-put-note-sections-into-a-pt_note-segment-in-vmlinux.patch
msi-use-kmem_cache_zalloc.patch
sysctl-allow-proc-sys-without-sys_sysctl.patch
sysctl-scream-if-someone-uses-sys_sysctl.patch
sysctl-document-that-sys_sysctl-will-be-removed.patch
pid-implement-transfer_pid-and-use-it-to-simplify-de_thread.patch
pid-remove-temporary-debug-code-in-attach_pid.patch
de_thread-use-tsk-not-current.patch
pidspace-is_init.patch
stack-overflow-safe-kdump-safe_smp_processor_id.patch
stack-overflow-safe-kdump-safe_smp_processor_id_voyager.patch
stack-overflow-safe-kdump-crash_use_safe_smp_processor_id.patch
stack-overflow-safe-kdump-crash_use_safe_smp_processor_id-fix.patch
stack-overflow-safe-kdump-safe_smp_send_nmi_allbutself.patch
proc-reorder-the-functions-in-basec.patch
proc-modify-proc_pident_lookup-to-be-completely-table-driven.patch
proc-give-the-root-directory-a-task.patch
proc-make-the-generation-of-the-self-symlink-table-driven.patch
proc-factor-out-an-instantiate-method-from-every-lookup-method.patch
proc-remove-the-hard-coded-inode-numbers.patch
proc-merge-proc_tid_attr-and-proc_tgid_attr.patch
pid-implement-access-helpers-for-a-tacks-various-process-groups.patch
pid-add-do_each_pid_task.patch
pid-implement-signal-functions-that-take-a-struct-pid.patch
pid-export-the-symbols-needed-to-use-struct-pid.patch
pid-implement-pid_nr.patch
vt-update-spawnpid-to-be-a-struct-pid_t.patch
file-modify-struct-fown_struct-to-use-a-struct-pid.patch
proc-sysctl-add-_proc_do_string-helper.patch
namespaces-add-nsproxy.patch
namespaces-add-nsproxy-dont-include-compileh.patch
namespaces-incorporate-fs-namespace-into-nsproxy.patch
namespaces-utsname-introduce-temporary-helpers.patch
namespaces-utsname-switch-to-using-uts-namespaces.patch
namespaces-utsname-use-init_utsname-when-appropriate.patch
namespaces-utsname-implement-utsname-namespaces.patch
namespaces-utsname-sysctl-hack.patch
namespaces-utsname-remove-system_utsname.patch
namespaces-utsname-implement-clone_newuts-flag.patch
uts-copy-nsproxy-only-when-needed.patch
namespaces-utsname-switch-to-using-uts-namespaces-klibc-bit.patch
namespaces-utsname-use-init_utsname-when-appropriate-klibc-bit.patch
namespaces-utsname-switch-to-using-uts-namespaces-klibc-bit-2.patch
ipc-namespace-core.patch
ipc-namespace-utils.patch
genirq-irq-convert-the-move_irq-flag-from-a-32bit-word-to-a-single-bit.patch
genirq-irq-add-moved_masked_irq.patch
genirq-x86_64-irq-reenable-migrating-irqs-to-other-cpus.patch
genirq-msi-simplify-msi-enable-and-disable.patch
genirq-msi-make-the-msi-boolean-tests-return-either-0-or-1.patch
genirq-msi-implement-helper-functions-read_msi_msg-and-write_msi_msg.patch
genirq-msi-refactor-the-msi_ops.patch
genirq-msi-simplify-the-msi-irq-limit-policy.patch
genirq-irq-add-a-dynamic-irq-creation-api.patch
genirq-ia64-irq-dynamic-irq-support.patch
genirq-i386-irq-dynamic-irq-support.patch
genirq-x86_64-irq-dynamic-irq-support.patch
genirq-msi-make-the-msi-code-irq-based-and-not-vector-based.patch
genirq-x86_64-irq-move-msi-message-composition-into-io_apicc.patch
genirq-i386-irq-move-msi-message-composition-into-io_apicc.patch
genirq-msi-only-build-msi-apicc-on-ia64.patch
genirq-msi-only-build-msi-apicc-on-ia64-fix.patch
genirq-x86_64-irq-remove-the-msi-assumption-that-irq-==-vector.patch
genirq-i386-irq-remove-the-msi-assumption-that-irq-==-vector.patch
genirq-irq-remove-msi-hacks.patch
genirq-irq-generalize-the-check-for-hardirq_bits.patch
genirq-x86_64-irq-make-the-external-irq-handlers-report-their-vector-not-the-irq-number.patch
genirq-x86_64-irq-make-vector_irq-per-cpu.patch
genirq-x86_64-irq-make-vector_irq-per-cpu-fix.patch
genirq-x86_64-irq-make-vector_irq-per-cpu-warning-fix.patch
genirq-x86_64-irq-kill-gsi_irq_sharing.patch
genirq-x86_64-irq-kill-irq-compression.patch
add-hypertransport-capability-defines.patch
add-hypertransport-capability-defines-fix.patch
initial-generic-hypertransport-interrupt-support.patch
initial-generic-hypertransport-interrupt-support-Kconfig-fix.patch
pidhash-temporary-debug-checks.patch
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