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Subject[RFC v17][PATCH 23/60] c/r: export functionality used in next patch for restart-blocks
Date
To support c/r of restart-blocks (system call that need to be
restarted because they were interrupted but there was no userspace
visible side-effect), export restart-block callbacks for poll()
and futex() syscalls.

More details on c/r of restart-blocks and how it works in the
following patch.

Signed-off-by: Oren Laadan <orenl@cs.columbia.edu>
Acked-by: Serge Hallyn <serue@us.ibm.com>
---
fs/select.c | 2 +-
include/linux/futex.h | 11 +++++++++++
include/linux/poll.h | 3 +++
include/linux/posix-timers.h | 6 ++++++
kernel/compat.c | 4 ++--
kernel/futex.c | 12 +-----------
kernel/posix-timers.c | 2 +-
7 files changed, 25 insertions(+), 15 deletions(-)

diff --git a/fs/select.c b/fs/select.c
index d870237..08d1d35 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -865,7 +865,7 @@ out_fds:
return err;
}

-static long do_restart_poll(struct restart_block *restart_block)
+long do_restart_poll(struct restart_block *restart_block)
{
struct pollfd __user *ufds = restart_block->poll.ufds;
int nfds = restart_block->poll.nfds;
diff --git a/include/linux/futex.h b/include/linux/futex.h
index 34956c8..4326f81 100644
--- a/include/linux/futex.h
+++ b/include/linux/futex.h
@@ -136,6 +136,17 @@ extern int
handle_futex_death(u32 __user *uaddr, struct task_struct *curr, int pi);

/*
+ * In case we must use restart_block to restart a futex_wait,
+ * we encode in the 'flags' shared capability
+ */
+#define FLAGS_SHARED 0x01
+#define FLAGS_CLOCKRT 0x02
+#define FLAGS_HAS_TIMEOUT 0x04
+
+/* for c/r */
+extern long futex_wait_restart(struct restart_block *restart);
+
+/*
* Futexes are matched on equal values of this key.
* The key type depends on whether it's a shared or private mapping.
* Don't rearrange members without looking at hash_futex().
diff --git a/include/linux/poll.h b/include/linux/poll.h
index fa287f2..0841c51 100644
--- a/include/linux/poll.h
+++ b/include/linux/poll.h
@@ -134,6 +134,9 @@ extern int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp,

extern int poll_select_set_timeout(struct timespec *to, long sec, long nsec);

+/* used by checkpoint/restart */
+extern long do_restart_poll(struct restart_block *restart_block);
+
#endif /* KERNEL */

#endif /* _LINUX_POLL_H */
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 4f71bf4..d0d6a66 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -101,6 +101,10 @@ int posix_cpu_timer_create(struct k_itimer *timer);
int posix_cpu_nsleep(const clockid_t which_clock, int flags,
struct timespec *rqtp, struct timespec __user *rmtp);
long posix_cpu_nsleep_restart(struct restart_block *restart_block);
+#ifdef CONFIG_COMPAT
+long compat_nanosleep_restart(struct restart_block *restart);
+long compat_clock_nanosleep_restart(struct restart_block *restart);
+#endif
int posix_cpu_timer_set(struct k_itimer *timer, int flags,
struct itimerspec *new, struct itimerspec *old);
int posix_cpu_timer_del(struct k_itimer *timer);
@@ -119,4 +123,6 @@ long clock_nanosleep_restart(struct restart_block *restart_block);

void update_rlimit_cpu(unsigned long rlim_new);

+int invalid_clockid(const clockid_t which_clock);
+
#endif
diff --git a/kernel/compat.c b/kernel/compat.c
index f6c204f..20afdba 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -100,7 +100,7 @@ int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user
__put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
}

-static long compat_nanosleep_restart(struct restart_block *restart)
+long compat_nanosleep_restart(struct restart_block *restart)
{
struct compat_timespec __user *rmtp;
struct timespec rmt;
@@ -647,7 +647,7 @@ long compat_sys_clock_getres(clockid_t which_clock,
return err;
}

-static long compat_clock_nanosleep_restart(struct restart_block *restart)
+long compat_clock_nanosleep_restart(struct restart_block *restart)
{
long err;
mm_segment_t oldfs;
diff --git a/kernel/futex.c b/kernel/futex.c
index 794c862..dfe246f 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1516,16 +1516,6 @@ handle_fault:
goto retry;
}

-/*
- * In case we must use restart_block to restart a futex_wait,
- * we encode in the 'flags' shared capability
- */
-#define FLAGS_SHARED 0x01
-#define FLAGS_CLOCKRT 0x02
-#define FLAGS_HAS_TIMEOUT 0x04
-
-static long futex_wait_restart(struct restart_block *restart);
-
/**
* fixup_owner() - Post lock pi_state and corner case management
* @uaddr: user address of the futex
@@ -1795,7 +1785,7 @@ out:
}


-static long futex_wait_restart(struct restart_block *restart)
+long futex_wait_restart(struct restart_block *restart)
{
u32 __user *uaddr = (u32 __user *)restart->futex.uaddr;
int fshared = 0;
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 052ec4d..589aed2 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -205,7 +205,7 @@ static int no_timer_create(struct k_itimer *new_timer)
/*
* Return nonzero if we know a priori this clockid_t value is bogus.
*/
-static inline int invalid_clockid(const clockid_t which_clock)
+int invalid_clockid(const clockid_t which_clock)
{
if (which_clock < 0) /* CPU clock, posix_cpu_* will check it */
return 0;
--
1.6.0.4


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