linux-kernel - [PATCH 3/6] aoe: provide file operations for debugfs files

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Date:	Tue, 23 Jul 2013 17:13:24 -0400
From:	Ed Cashin <ecashin@...aid.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, ecashin@...aid.com
Subject:  [PATCH 3/6] aoe: provide file operations for debugfs files

The place holder in the file contents is filled out in the
following patch.

Signed-off-by: Ed Cashin <ecashin@...aid.com>
---
 drivers/block/aoe/aoeblk.c |   25 ++++++++++++++++++++++++-
 1 files changed, 24 insertions(+), 1 deletions(-)

diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index d76c5cb..0511d38 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -110,6 +110,24 @@ static ssize_t aoedisk_show_payload(struct device *dev,
 	return snprintf(page, PAGE_SIZE, "%lu\n", d->maxbcnt);
 }
 
+static int aoedisk_debugfs_show(struct seq_file *s, void *ignored)
+{
+	struct aoedev *d;
+	unsigned long flags;
+
+	d = s->private;
+	spin_lock_irqsave(&d->lock, flags);
+	seq_printf(s, "%s\n", d->gd->disk_name); /* place holder */
+	spin_unlock_irqrestore(&d->lock, flags);
+
+	return 0;
+}
+
+static int aoe_debugfs_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, aoedisk_debugfs_show, inode->i_private);
+}
+
 static DEVICE_ATTR(state, S_IRUGO, aoedisk_show_state, NULL);
 static DEVICE_ATTR(mac, S_IRUGO, aoedisk_show_mac, NULL);
 static DEVICE_ATTR(netif, S_IRUGO, aoedisk_show_netif, NULL);
@@ -132,7 +150,12 @@ static const struct attribute_group attr_group = {
 	.attrs = aoe_attrs,
 };
 
-static const struct file_operations aoe_debugfs_fops;
+static const struct file_operations aoe_debugfs_fops = {
+	.open = aoe_debugfs_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
 
 static void
 aoedisk_add_debugfs(struct aoedev *d)
-- 
1.7.1

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