[PATCH] knfsd: Allow lockd to drop replies as appropriate

[pandora-kernel.git] / fs / fcntl.c

diff --git a/fs/fcntl.c b/fs/fcntl.c
index 2a24791..e4f2616 100644 (file)
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -250,19 +250,22 @@ static int setfl(int fd, struct file * filp, unsigned long arg)
        return error;
 }
 
-static void f_modown(struct file *filp, unsigned long pid,
+static void f_modown(struct file *filp, struct pid *pid, enum pid_type type,
                      uid_t uid, uid_t euid, int force)
 {
        write_lock_irq(&filp->f_owner.lock);
        if (force || !filp->f_owner.pid) {
-               filp->f_owner.pid = 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;
        }
        write_unlock_irq(&filp->f_owner.lock);
 }
 
-int f_setown(struct file *filp, unsigned long arg, int force)
+int __f_setown(struct file *filp, struct pid *pid, enum pid_type type,
+               int force)
 {
        int err;
        
@@ -270,15 +273,44 @@ int f_setown(struct file *filp, unsigned long arg, int force)
        if (err)
                return err;
 
-       f_modown(filp, arg, current->uid, current->euid, force);
+       f_modown(filp, pid, type, current->uid, current->euid, force);
        return 0;
 }
+EXPORT_SYMBOL(__f_setown);
 
+int f_setown(struct file *filp, unsigned long arg, int force)
+{
+       enum pid_type type;
+       struct pid *pid;
+       int who = arg;
+       int result;
+       type = PIDTYPE_PID;
+       if (who < 0) {
+               type = PIDTYPE_PGID;
+               who = -who;
+       }
+       rcu_read_lock();
+       pid = find_pid(who);
+       result = __f_setown(filp, pid, type, force);
+       rcu_read_unlock();
+       return result;
+}
 EXPORT_SYMBOL(f_setown);
 
 void f_delown(struct file *filp)
 {
-       f_modown(filp, 0, 0, 0, 1);
+       f_modown(filp, NULL, PIDTYPE_PID, 0, 0, 1);
+}
+
+pid_t f_getown(struct file *filp)
+{
+       pid_t pid;
+       read_lock(&filp->f_owner.lock);
+       pid = pid_nr(filp->f_owner.pid);
+       if (filp->f_owner.pid_type == PIDTYPE_PGID)
+               pid = -pid;
+       read_unlock(&filp->f_owner.lock);
+       return pid;
 }
 
 static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
@@ -319,7 +351,7 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
                 * current syscall conventions, the only way
                 * to fix this will be in libc.
                 */
-               err = filp->f_owner.pid;
+               err = f_getown(filp);
                force_successful_syscall_return();
                break;
        case F_SETOWN:
@@ -453,8 +485,7 @@ static void send_sigio_to_task(struct task_struct *p,
                        /* Make sure we are called with one of the POLL_*
                           reasons, otherwise we could leak kernel stack into
                           userspace.  */
-                       if ((reason & __SI_MASK) != __SI_POLL)
-                               BUG();
+                       BUG_ON((reason & __SI_MASK) != __SI_POLL);
                        if (reason - POLL_IN >= NSIGPOLL)
                                si.si_band  = ~0L;
                        else
@@ -471,24 +502,19 @@ static void send_sigio_to_task(struct task_struct *p,
 void send_sigio(struct fown_struct *fown, int fd, int band)
 {
        struct task_struct *p;
-       int pid;
+       enum pid_type type;
+       struct pid *pid;
        
        read_lock(&fown->lock);
+       type = fown->pid_type;
        pid = fown->pid;
        if (!pid)
                goto out_unlock_fown;
        
        read_lock(&tasklist_lock);
-       if (pid > 0) {
-               p = find_task_by_pid(pid);
-               if (p) {
-                       send_sigio_to_task(p, fown, fd, band);
-               }
-       } else {
-               do_each_task_pid(-pid, PIDTYPE_PGID, p) {
-                       send_sigio_to_task(p, fown, fd, band);
-               } while_each_task_pid(-pid, PIDTYPE_PGID, p);
-       }
+       do_each_pid_task(pid, type, p) {
+               send_sigio_to_task(p, fown, fd, band);
+       } while_each_pid_task(pid, type, p);
        read_unlock(&tasklist_lock);
  out_unlock_fown:
        read_unlock(&fown->lock);
@@ -504,9 +530,12 @@ static void send_sigurg_to_task(struct task_struct *p,
 int send_sigurg(struct fown_struct *fown)
 {
        struct task_struct *p;
-       int pid, ret = 0;
+       enum pid_type type;
+       struct pid *pid;
+       int ret = 0;
        
        read_lock(&fown->lock);
+       type = fown->pid_type;
        pid = fown->pid;
        if (!pid)
                goto out_unlock_fown;
@@ -514,16 +543,9 @@ int send_sigurg(struct fown_struct *fown)
        ret = 1;
        
        read_lock(&tasklist_lock);
-       if (pid > 0) {
-               p = find_task_by_pid(pid);
-               if (p) {
-                       send_sigurg_to_task(p, fown);
-               }
-       } else {
-               do_each_task_pid(-pid, PIDTYPE_PGID, p) {
-                       send_sigurg_to_task(p, fown);
-               } while_each_task_pid(-pid, PIDTYPE_PGID, p);
-       }
+       do_each_pid_task(pid, type, p) {
+               send_sigurg_to_task(p, fown);
+       } while_each_pid_task(pid, type, p);
        read_unlock(&tasklist_lock);
  out_unlock_fown:
        read_unlock(&fown->lock);