[patch 4/6] signalfd: Use sequential fdinfo engine

[Cyrill Gorcunov <gorcunov@openvz.org>]

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Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andrey Vagin <avagin@openvz.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: James Bottomley <jbottomley@parallels.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Matthew Helsley <matt.helsley@gmail.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@onelan.co.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
---
 fs/signalfd.c |   30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

Index: linux-2.6.git/fs/signalfd.c
===================================================================
--- linux-2.6.git.orig/fs/signalfd.c
+++ linux-2.6.git/fs/signalfd.c
@@ -230,9 +230,26 @@ static ssize_t signalfd_read(struct file
 }
 
 #ifdef CONFIG_PROC_FS
-static int signalfd_show_fdinfo(struct seq_file *m, struct file *f)
+static void *seq_start(struct seq_file *m, loff_t *pos)
 {
-	struct signalfd_ctx *ctx = f->private_data;
+	if (*pos == 0)
+		return m->private;
+	return NULL;
+}
+
+static void seq_stop(struct seq_file *m, void *v)
+{
+}
+
+static void *seq_next(struct seq_file *m, void *p, loff_t *pos)
+{
+	++*pos;
+	return NULL;
+}
+
+static int seq_show(struct seq_file *m, void *v)
+{
+	struct signalfd_ctx *ctx = ((struct file *)v)->private_data;
 	sigset_t sigmask;
 
 	sigmask = ctx->sigmask;
@@ -241,11 +258,18 @@ static int signalfd_show_fdinfo(struct s
 
 	return 0;
 }
+
+static struct seq_operations signalfd_fdinfo_ops = {
+	.start		= seq_start,
+	.next		= seq_next,
+	.stop		= seq_stop,
+	.show		= seq_show,
+};
 #endif
 
 static const struct file_operations signalfd_fops = {
 #ifdef CONFIG_PROC_FS
-	.show_fdinfo	= signalfd_show_fdinfo,
+	.fdinfo_ops	= &signalfd_fdinfo_ops,
 #endif
 	.release	= signalfd_release,
 	.poll		= signalfd_poll,