[patch 8/8] fdinfo: Show sigmask for signalfd fd v2

[Cyrill Gorcunov]

Signed-off-by: Pavel Emelyanov <xe...@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcu...@openvz.org>
---
 fs/proc/array.c         |    2 +-
 fs/signalfd.c           |   26 ++++++++++++++++++++++++++
 include/linux/proc_fs.h |    3 +++
 3 files changed, 30 insertions(+), 1 deletion(-)

Index: linux-2.6.git/fs/proc/array.c
===================================================================
--- linux-2.6.git.orig/fs/proc/array.c
+++ linux-2.6.git/fs/proc/array.c
@@ -220,7 +220,7 @@ static inline void task_state(struct seq
        seq_putc(m, '\n');
 }
 
-static void render_sigset_t(struct seq_file *m, const char *header,
+void render_sigset_t(struct seq_file *m, const char *header,
                                sigset_t *set)
 {
        int i;
Index: linux-2.6.git/fs/signalfd.c
===================================================================
--- linux-2.6.git.orig/fs/signalfd.c
+++ linux-2.6.git/fs/signalfd.c
@@ -29,6 +29,7 @@
 #include <linux/anon_inodes.h>
 #include <linux/signalfd.h>
 #include <linux/syscalls.h>
+#include <linux/proc_fs.h>
 
 void signalfd_cleanup(struct sighand_struct *sighand)
 {
@@ -46,6 +47,7 @@ void signalfd_cleanup(struct sighand_str
 }
 
 struct signalfd_ctx {
+       seqcount_t cnt;
        sigset_t sigmask;
 };
 
@@ -227,7 +229,28 @@ static ssize_t signalfd_read(struct file
        return total ? total: ret;
 }
 
+#ifdef CONFIG_PROC_FS
+static int signalfd_show_fdinfo(struct seq_file *m, struct file *f)
+{
+       struct signalfd_ctx *ctx = f->private_data;
+       sigset_t sigmask;
+       unsigned seq;
+
+       do {
+               seq = read_seqcount_begin(&ctx->cnt);
+               sigmask = ctx->sigmask;
+       } while (read_seqcount_retry(&ctx->cnt, seq));
+
+       signotset(&sigmask);
+       render_sigset_t(m, "sigmask:\t", &sigmask);
+       return 0;
+}
+#endif
+
 static const struct file_operations signalfd_fops = {
+#ifdef CONFIG_PROC_FS
+       .show_fdinfo    = signalfd_show_fdinfo,
+#endif
        .release        = signalfd_release,
        .poll           = signalfd_poll,
        .read           = signalfd_read,
@@ -259,6 +282,7 @@ SYSCALL_DEFINE4(signalfd4, int, ufd, sig
                        return -ENOMEM;
 
                ctx->sigmask = sigmask;
+               seqcount_init(&ctx->cnt);
 
                /*
                 * When we call this, the initialization must be complete, since
@@ -279,7 +303,9 @@ SYSCALL_DEFINE4(signalfd4, int, ufd, sig
                        return -EINVAL;
                }
                spin_lock_irq(&current->sighand->siglock);
+               write_seqcount_begin(&ctx->cnt);
                ctx->sigmask = sigmask;
+               write_seqcount_end(&ctx->cnt);
                spin_unlock_irq(&current->sighand->siglock);
 
                wake_up(&current->sighand->signalfd_wqh);
Index: linux-2.6.git/include/linux/proc_fs.h
===================================================================
--- linux-2.6.git.orig/include/linux/proc_fs.h
+++ linux-2.6.git/include/linux/proc_fs.h
@@ -290,4 +290,7 @@ static inline struct net *PDE_NET(struct
        return pde->parent->data;
 }
 
+#include <asm/signal.h>
+
+void render_sigset_t(struct seq_file *m, const char *header, sigset_t *set);
 #endif /* _LINUX_PROC_FS_H */

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