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Message-Id: <11660080793400-git-send-email-ebiederm@xmission.com>
Date: Wed, 13 Dec 2006 04:07:54 -0700
From: "Eric W. Biederman" <ebiederm@...ssion.com>
To: "<Andrew Morton" <akpm@...l.org>
Cc: <containers@...ts.osdl.org>, Oleg Nesterov <oleg@...sign.ru>,
Alan Cox <alan@...rguk.ukuu.org.uk>,
<linux-kernel@...r.kernel.org>,
"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 10/12] pid: Replace do/while_each_task_pid with do/while_each_pid_task
There isn't any real advantage to this change except that
it allows the old functions to be removed. Which is easier
on maintenance and puts the code in a more uniform style.
Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
fs/ioprio.c | 18 ++++++++++++------
kernel/capability.c | 8 +++++---
kernel/sys.c | 40 ++++++++++++++++++++++++----------------
3 files changed, 41 insertions(+), 25 deletions(-)
diff --git a/fs/ioprio.c b/fs/ioprio.c
index 89e8da1..10d2c21 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -60,6 +60,7 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
int data = IOPRIO_PRIO_DATA(ioprio);
struct task_struct *p, *g;
struct user_struct *user;
+ struct pid *pgrp;
int ret;
switch (class) {
@@ -98,12 +99,14 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
break;
case IOPRIO_WHO_PGRP:
if (!who)
- who = process_group(current);
- do_each_task_pid(who, PIDTYPE_PGID, p) {
+ pgrp = task_pgrp(current);
+ else
+ pgrp = find_pid(who);
+ do_each_pid_task(pgrp, PIDTYPE_PGID, p) {
ret = set_task_ioprio(p, ioprio);
if (ret)
break;
- } while_each_task_pid(who, PIDTYPE_PGID, p);
+ } while_each_pid_task(pgrp, PIDTYPE_PGID, p);
break;
case IOPRIO_WHO_USER:
if (!who)
@@ -167,6 +170,7 @@ asmlinkage long sys_ioprio_get(int which, int who)
{
struct task_struct *g, *p;
struct user_struct *user;
+ struct pid *pgrp;
int ret = -ESRCH;
int tmpio;
@@ -182,8 +186,10 @@ asmlinkage long sys_ioprio_get(int which, int who)
break;
case IOPRIO_WHO_PGRP:
if (!who)
- who = process_group(current);
- do_each_task_pid(who, PIDTYPE_PGID, p) {
+ pgrp = task_pgrp(current);
+ else
+ pgrp = find_pid(who);
+ do_each_pid_task(pgrp, PIDTYPE_PGID, p) {
tmpio = get_task_ioprio(p);
if (tmpio < 0)
continue;
@@ -191,7 +197,7 @@ asmlinkage long sys_ioprio_get(int which, int who)
ret = tmpio;
else
ret = ioprio_best(ret, tmpio);
- } while_each_task_pid(who, PIDTYPE_PGID, p);
+ } while_each_pid_task(pgrp, PIDTYPE_PGID, p);
break;
case IOPRIO_WHO_USER:
if (!who)
diff --git a/kernel/capability.c b/kernel/capability.c
index edb845a..c8d3c77 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -92,15 +92,17 @@ out:
* cap_set_pg - set capabilities for all processes in a given process
* group. We call this holding task_capability_lock and tasklist_lock.
*/
-static inline int cap_set_pg(int pgrp, kernel_cap_t *effective,
+static inline int cap_set_pg(int pgrp_nr, kernel_cap_t *effective,
kernel_cap_t *inheritable,
kernel_cap_t *permitted)
{
struct task_struct *g, *target;
int ret = -EPERM;
int found = 0;
+ struct pid *pgrp;
- do_each_task_pid(pgrp, PIDTYPE_PGID, g) {
+ pgrp = find_pid(pgrp_nr);
+ do_each_pid_task(pgrp, PIDTYPE_PGID, g) {
target = g;
while_each_thread(g, target) {
if (!security_capset_check(target, effective,
@@ -113,7 +115,7 @@ static inline int cap_set_pg(int pgrp, kernel_cap_t *effective,
}
found = 1;
}
- } while_each_task_pid(pgrp, PIDTYPE_PGID, g);
+ } while_each_pid_task(pgrp, PIDTYPE_PGID, g);
if (!found)
ret = 0;
diff --git a/kernel/sys.c b/kernel/sys.c
index a8f2ebe..c452ba9 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -589,6 +589,7 @@ asmlinkage long sys_setpriority(int which, int who, int niceval)
struct task_struct *g, *p;
struct user_struct *user;
int error = -EINVAL;
+ struct pid *pgrp;
if (which > 2 || which < 0)
goto out;
@@ -603,18 +604,21 @@ asmlinkage long sys_setpriority(int which, int who, int niceval)
read_lock(&tasklist_lock);
switch (which) {
case PRIO_PROCESS:
- if (!who)
- who = current->pid;
- p = find_task_by_pid(who);
+ if (who)
+ p = find_task_by_pid(who);
+ else
+ p = current;
if (p)
error = set_one_prio(p, niceval, error);
break;
case PRIO_PGRP:
- if (!who)
- who = process_group(current);
- do_each_task_pid(who, PIDTYPE_PGID, p) {
+ if (who)
+ pgrp = find_pid(who);
+ else
+ pgrp = task_pgrp(current);
+ do_each_pid_task(pgrp, PIDTYPE_PGID, p) {
error = set_one_prio(p, niceval, error);
- } while_each_task_pid(who, PIDTYPE_PGID, p);
+ } while_each_pid_task(pgrp, PIDTYPE_PGID, p);
break;
case PRIO_USER:
user = current->user;
@@ -649,6 +653,7 @@ asmlinkage long sys_getpriority(int which, int who)
struct task_struct *g, *p;
struct user_struct *user;
long niceval, retval = -ESRCH;
+ struct pid *pgrp;
if (which > 2 || which < 0)
return -EINVAL;
@@ -656,9 +661,10 @@ asmlinkage long sys_getpriority(int which, int who)
read_lock(&tasklist_lock);
switch (which) {
case PRIO_PROCESS:
- if (!who)
- who = current->pid;
- p = find_task_by_pid(who);
+ if (who)
+ p = find_task_by_pid(who);
+ else
+ p = current;
if (p) {
niceval = 20 - task_nice(p);
if (niceval > retval)
@@ -666,13 +672,15 @@ asmlinkage long sys_getpriority(int which, int who)
}
break;
case PRIO_PGRP:
- if (!who)
- who = process_group(current);
- do_each_task_pid(who, PIDTYPE_PGID, p) {
+ if (who)
+ pgrp = find_pid(who);
+ else
+ pgrp = task_pgrp(current);
+ do_each_pid_task(pgrp, PIDTYPE_PGID, p) {
niceval = 20 - task_nice(p);
if (niceval > retval)
retval = niceval;
- } while_each_task_pid(who, PIDTYPE_PGID, p);
+ } while_each_pid_task(pgrp, PIDTYPE_PGID, p);
break;
case PRIO_USER:
user = current->user;
@@ -1381,7 +1389,7 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
if (p->real_parent == group_leader) {
err = -EPERM;
- if (process_session(p) != process_session(group_leader))
+ if (task_session(p) != task_session(group_leader))
goto out;
err = -EACCES;
if (p->did_exec)
@@ -1400,7 +1408,7 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
struct task_struct *g =
find_task_by_pid_type(PIDTYPE_PGID, pgid);
- if (!g || process_session(g) != process_session(group_leader))
+ if (!g || task_session(g) != task_session(group_leader))
goto out;
}
--
1.4.4.1.g278f
-
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