fcntl: add F_[SG]ETOWN_EX

In order to direct the SIGIO signal to a particular thread of a
multi-threaded application we cannot, like suggested by the manpage, put a
TID into the regular fcntl(F_SETOWN) call.  It will still be send to the
whole process of which that thread is part.

Since people do want to properly direct SIGIO we introduce F_SETOWN_EX.

The need to direct SIGIO comes from self-monitoring profiling such as with
perf-counters.  Perf-counters uses SIGIO to notify that new sample data is
available.  If the signal is delivered to the same task that generated the
new sample it can augment that data by inspecting the task's user-space
state right after it returns from the kernel.  This is esp.  convenient
for interpreted or virtual machine driven environments.

Both F_SETOWN_EX and F_GETOWN_EX take a pointer to a struct f_owner_ex
as argument:

struct f_owner_ex {
	int   type;
	pid_t pid;
};

Where type is one of F_OWNER_TID, F_OWNER_PID or F_OWNER_GID.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Tested-by: stephane eranian <eranian@googlemail.com>
Cc: Michael Kerrisk <mtk.manpages@googlemail.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 117 insertions, 8 deletions

diff --git a/arch/alpha/include/asm/fcntl.h b/arch/alpha/include/asm/fcntl.h
index 25da0017ec87..e42823e954aa 100644
--- a/arch/alpha/include/asm/fcntl.h
+++ b/arch/alpha/include/asm/fcntl.h
@@ -26,6 +26,8 @@
 #define F_GETOWN        6       /*  for sockets. */
 #define F_SETSIG        10      /*  for sockets. */
 #define F_GETSIG        11      /*  for sockets. */
+#define F_SETOWN_EX     12
+#define F_GETOWN_EX     13
 
 /* for posix fcntl() and lockf() */
 #define F_RDLCK         1
diff --git a/arch/parisc/include/asm/fcntl.h b/arch/parisc/include/asm/fcntl.h
index 1e1c824764ee..5f39d5597ced 100644
--- a/arch/parisc/include/asm/fcntl.h
+++ b/arch/parisc/include/asm/fcntl.h
@@ -28,6 +28,8 @@
 #define F_SETOWN        12      /*  for sockets. */
 #define F_SETSIG        13      /*  for sockets. */
 #define F_GETSIG        14      /*  for sockets. */
+#define F_GETOWN_EX     15
+#define F_SETOWN_EX     16
 
 /* for posix fcntl() and lockf() */
 #define F_RDLCK         01
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 50a988993262..fc089f2f7f56 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -263,6 +263,79 @@ pid_t f_getown(struct file *filp)
         return pid;
 }
 
+static int f_setown_ex(struct file *filp, unsigned long arg)
+{
+        struct f_owner_ex * __user owner_p = (void * __user)arg;
+        struct f_owner_ex owner;
+        struct pid *pid;
+        int type;
+        int ret;
+
+        ret = copy_from_user(&owner, owner_p, sizeof(owner));
+        if (ret)
+                return ret;
+
+        switch (owner.type) {
+        case F_OWNER_TID:
+                type = PIDTYPE_MAX;
+                break;
+
+        case F_OWNER_PID:
+                type = PIDTYPE_PID;
+                break;
+
+        case F_OWNER_GID:
+                type = PIDTYPE_PGID;
+                break;
+
+        default:
+                return -EINVAL;
+        }
+
+        rcu_read_lock();
+        pid = find_vpid(owner.pid);
+        if (owner.pid && !pid)
+                ret = -ESRCH;
+        else
+                ret = __f_setown(filp, pid, type, 1);
+        rcu_read_unlock();
+
+        return ret;
+}
+
+static int f_getown_ex(struct file *filp, unsigned long arg)
+{
+        struct f_owner_ex * __user owner_p = (void * __user)arg;
+        struct f_owner_ex owner;
+        int ret = 0;
+
+        read_lock(&filp->f_owner.lock);
+        owner.pid = pid_vnr(filp->f_owner.pid);
+        switch (filp->f_owner.pid_type) {
+        case PIDTYPE_MAX:
+                owner.type = F_OWNER_TID;
+                break;
+
+        case PIDTYPE_PID:
+                owner.type = F_OWNER_PID;
+                break;
+
+        case PIDTYPE_PGID:
+                owner.type = F_OWNER_GID;
+                break;
+
+        default:
+                WARN_ON(1);
+                ret = -EINVAL;
+                break;
+        }
+        read_unlock(&filp->f_owner.lock);
+
+        if (!ret)
+                ret = copy_to_user(owner_p, &owner, sizeof(owner));
+        return ret;
+}
+
 static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
                 struct file *filp)
 {
@@ -313,6 +386,12 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
         case F_SETOWN:
                 err = f_setown(filp, arg, 1);
                 break;
+        case F_GETOWN_EX:
+                err = f_getown_ex(filp, arg);
+                break;
+        case F_SETOWN_EX:
+                err = f_setown_ex(filp, arg);
+                break;
         case F_GETSIG:
                 err = filp->f_owner.signum;
                 break;
@@ -428,8 +507,7 @@ static inline int sigio_perm(struct task_struct *p,
 
 static void send_sigio_to_task(struct task_struct *p,
                                struct fown_struct *fown,
-                               int fd,
-                               int reason)
+                               int fd, int reason, int group)
 {
         /*
          * F_SETSIG can change ->signum lockless in parallel, make
@@ -461,11 +539,11 @@ static void send_sigio_to_task(struct task_struct *p,
                         else
                                 si.si_band = band_table[reason - POLL_IN];
                         si.si_fd    = fd;
-                        if (!do_send_sig_info(signum, &si, p, true))
+                        if (!do_send_sig_info(signum, &si, p, group))
                                 break;
                 /* fall-through: fall back on the old plain SIGIO signal */
                 case 0:
-                        do_send_sig_info(SIGIO, SEND_SIG_PRIV, p, true);
+                        do_send_sig_info(SIGIO, SEND_SIG_PRIV, p, group);
         }
 }
 
@@ -474,16 +552,23 @@ void send_sigio(struct fown_struct *fown, int fd, int band)
         struct task_struct *p;
         enum pid_type type;
         struct pid *pid;
+        int group = 1;
         
         read_lock(&fown->lock);
+
         type = fown->pid_type;
+        if (type == PIDTYPE_MAX) {
+                group = 0;
+                type = PIDTYPE_PID;
+        }
+
         pid = fown->pid;
         if (!pid)
                 goto out_unlock_fown;
         
         read_lock(&tasklist_lock);
         do_each_pid_task(pid, type, p) {
-                send_sigio_to_task(p, fown, fd, band);
+                send_sigio_to_task(p, fown, fd, band, group);
         } while_each_pid_task(pid, type, p);
         read_unlock(&tasklist_lock);
  out_unlock_fown:
@@ -491,10 +576,10 @@ void send_sigio(struct fown_struct *fown, int fd, int band)
 }
 
 static void send_sigurg_to_task(struct task_struct *p,
-                                struct fown_struct *fown)
+                                struct fown_struct *fown, int group)
 {
         if (sigio_perm(p, fown, SIGURG))
-                group_send_sig_info(SIGURG, SEND_SIG_PRIV, p);
+                do_send_sig_info(SIGURG, SEND_SIG_PRIV, p, group);
 }
 
 int send_sigurg(struct fown_struct *fown)
@@ -502,10 +587,17 @@ int send_sigurg(struct fown_struct *fown)
         struct task_struct *p;
         enum pid_type type;
         struct pid *pid;
+        int group = 1;
         int ret = 0;
         
         read_lock(&fown->lock);
+
         type = fown->pid_type;
+        if (type == PIDTYPE_MAX) {
+                group = 0;
+                type = PIDTYPE_PID;
+        }
+
         pid = fown->pid;
         if (!pid)
                 goto out_unlock_fown;
@@ -514,7 +606,7 @@ int send_sigurg(struct fown_struct *fown)
         
         read_lock(&tasklist_lock);
         do_each_pid_task(pid, type, p) {
-                send_sigurg_to_task(p, fown);
+                send_sigurg_to_task(p, fown, group);
         } while_each_pid_task(pid, type, p);
         read_unlock(&tasklist_lock);
  out_unlock_fown:
diff --git a/include/asm-generic/fcntl.h b/include/asm-generic/fcntl.h
index 4d3e48373e74..0c3dd8603927 100644
--- a/include/asm-generic/fcntl.h
+++ b/include/asm-generic/fcntl.h
@@ -73,6 +73,19 @@
 #define F_SETSIG        10      /* for sockets. */
 #define F_GETSIG        11      /* for sockets. */
 #endif
+#ifndef F_SETOWN_EX
+#define F_SETOWN_EX     12
+#define F_GETOWN_EX     13
+#endif
+
+#define F_OWNER_TID     0
+#define F_OWNER_PID     1
+#define F_OWNER_GID     2
+
+struct f_owner_ex {
+        int     type;
+        pid_t   pid;
+};
 
 /* for F_[GET|SET]FL */
 #define FD_CLOEXEC      1       /* actually anything with low bit set goes */