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Code Issues Releases Wiki Activity

shift current_cred() from __f_setown() to f_modown() 

Shift current_cred() from __f_setown() to f_modown(). This reduces
the number of arguments and saves 48 bytes from fs/fcntl.o.

[ Note: this doesn't clear euid/uid when pid is set to NULL.  But if
  f_owner.pid == NULL we never use f_owner.uid/euid.  Otherwise we'd
  have a bug anyway: we must not send signals if pid was reset to NULL.  ]

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2009-06-16 22:07:46 +02:00 committed by Linus Torvalds
parent b3fec0fe35
commit 2f38d70fb4
1 changed files with 10 additions and 7 deletions
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17
fs/fcntl.c
View File

@ -198,15 +198,19 @@ static int setfl(int fd, struct file * filp, unsigned long arg)
}
static void f_modown(struct file *filp, struct pid *pid, enum pid_type type,
uid_t uid, uid_t euid, int force)
int force)
{
write_lock_irq(&filp->f_owner.lock);
if (force || !filp->f_owner.pid) {
put_pid(filp->f_owner.pid);
filp->f_owner.pid = get_pid(pid);
filp->f_owner.pid_type = type;
filp->f_owner.uid = uid;
filp->f_owner.euid = euid;
if (pid) {
const struct cred *cred = current_cred();
filp->f_owner.uid = cred->uid;
filp->f_owner.euid = cred->euid;
}
}
write_unlock_irq(&filp->f_owner.lock);
}
@ -214,14 +218,13 @@ static void f_modown(struct file *filp, struct pid *pid, enum pid_type type,
int __f_setown(struct file *filp, struct pid *pid, enum pid_type type,
int force)
{
const struct cred *cred = current_cred();
int err;
err = security_file_set_fowner(filp);
if (err)
return err;
f_modown(filp, pid, type, cred->uid, cred->euid, force);
f_modown(filp, pid, type, force);
return 0;
}
EXPORT_SYMBOL(__f_setown);
@ -247,7 +250,7 @@ EXPORT_SYMBOL(f_setown);
void f_delown(struct file *filp)
{
f_modown(filp, NULL, PIDTYPE_PID, 0, 0, 1);
f_modown(filp, NULL, PIDTYPE_PID, 1);
}
pid_t f_getown(struct file *filp)