From: Cyrill Gorcunov <gorcunov@openvz.org>
To: linux-kernel@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org,
Cyrill Gorcunov <gorcunov@openvz.org>,
Al Viro <viro@ZenIV.linux.org.uk>,
Alexey Dobriyan <adobriyan@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Pavel Emelyanov <xemul@parallels.com>,
James Bottomley <jbottomley@parallels.com>
Subject: [rfc 4/7] fs, eventfd: Add procfs fdinfo helper
Date: Wed, 27 Jun 2012 15:01:20 +0400 [thread overview]
Message-ID: <20120627110512.652322059@openvz.org> (raw)
In-Reply-To: 20120627110116.201735815@openvz.org
[-- Attachment #1: seq-fdinfo-eventfd-6 --]
[-- Type: text/plain, Size: 2276 bytes --]
This allow us to print out raw counter value.
The /proc/pid/fdinfo/fd output is
| pos: 0
| flags: 04002
| eventfd-count: 5a
This feature is CONFIG_CHECKPOINT_RESTORE only.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
CC: Al Viro <viro@ZenIV.linux.org.uk>
CC: Alexey Dobriyan <adobriyan@gmail.com>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Pavel Emelyanov <xemul@parallels.com>
CC: James Bottomley <jbottomley@parallels.com>
---
fs/eventfd.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)
Index: linux-2.6.git/fs/eventfd.c
===================================================================
--- linux-2.6.git.orig/fs/eventfd.c
+++ linux-2.6.git/fs/eventfd.c
@@ -19,6 +19,8 @@
#include <linux/export.h>
#include <linux/kref.h>
#include <linux/eventfd.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
struct eventfd_ctx {
struct kref kref;
@@ -433,3 +435,56 @@ SYSCALL_DEFINE1(eventfd, unsigned int, c
return sys_eventfd2(count, 0);
}
+#if defined(CONFIG_PROC_FS) && defined(CONFIG_CHECKPOINT_RESTORE)
+
+static void *seq_start(struct seq_file *m, loff_t *pos)
+{
+ struct proc_fdinfo_extra *extra = m->private;
+ return *pos == 0 ? extra->f_file : NULL;
+}
+
+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 eventfd_ctx *ctx = ((struct file *)v)->private_data;
+
+ spin_lock_irq(&ctx->wqh.lock);
+ seq_printf(m, "eventfd-count: %16llx\n",
+ (unsigned long long)ctx->count);
+ spin_unlock_irq(&ctx->wqh.lock);
+
+ return 0;
+}
+
+static void seq_stop(struct seq_file *p, void *v) { }
+
+static const struct seq_operations eventfd_fdinfo_ops = {
+ .start = seq_start,
+ .next = seq_next,
+ .stop = seq_stop,
+ .show = seq_show,
+};
+
+static int is_eventfd_file(struct file *file)
+{
+ return file->f_op == &eventfd_fops;
+}
+
+static struct proc_fdinfo_driver eventfd_fdinfo = {
+ .name = "eventfd",
+ .ops = &eventfd_fdinfo_ops,
+ .probe = is_eventfd_file,
+};
+
+static int __init eventfd_init(void)
+{
+ return proc_register_fdinfo_driver(&eventfd_fdinfo);
+}
+fs_initcall(eventfd_init);
+
+#endif /* CONFIG_PROC_FS && CONFIG_CHECKPOINT_RESTORE */
next prev parent reply other threads:[~2012-06-27 11:05 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-27 11:01 [rfc 0/7] [rfc] procfs, fdinfo seqfile providers Cyrill Gorcunov
2012-06-27 11:01 ` [rfc 1/7] procfs: Move /proc/pid/fd[info] handling code to fd.[ch] Cyrill Gorcunov
2012-06-27 11:01 ` [rfc 2/7] procfs: Convert /proc/pid/fdinfo/ handling routines to seq-file Cyrill Gorcunov
2012-07-04 7:37 ` Pavel Emelyanov
2012-07-04 8:03 ` Cyrill Gorcunov
2012-07-05 17:37 ` Cyrill Gorcunov
2012-06-27 11:01 ` [rfc 3/7] procfs: Add ability to plugin auxiliary fdinfo providers Cyrill Gorcunov
2012-07-04 7:39 ` Pavel Emelyanov
2012-07-04 7:50 ` Cyrill Gorcunov
2012-07-05 17:44 ` Cyrill Gorcunov
2012-06-27 11:01 ` Cyrill Gorcunov [this message]
2012-06-27 11:01 ` [rfc 5/7] fs, epoll: Add procfs fdinfo helper Cyrill Gorcunov
2012-07-19 14:52 ` Matthew Helsley
2012-07-19 15:03 ` Cyrill Gorcunov
2012-06-27 11:01 ` [rfc 6/7] fs, exportfs: Add export_encode_inode_fh helper Cyrill Gorcunov
2012-06-27 11:01 ` [rfc 7/7] fs, notify: Add procfs fdinfo helper Cyrill Gorcunov
2012-06-29 10:30 ` Cyrill Gorcunov
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