[PATCH 4/6] xfs: add xlog sysfs kobject and attribute handlers

[Brian Foster <bfoster@xxxxxxxxxx>]

Embed a kobject into the xfs log data structure (xlog). This creates a
'log' subdirectory for every XFS mount instance in sysfs. The lifecycle
of the log kobject is tied to the lifecycle of the log.

Also define a set of generic attribute handlers associated with the log
kobject in preparation for the addition of attributes.

Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx>
---
 fs/xfs/xfs_log.c      |  9 +++++++++
 fs/xfs/xfs_log_priv.h |  3 +++
 fs/xfs/xfs_sysfs.c    | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++
 fs/xfs/xfs_sysfs.h    |  1 +
 4 files changed, 66 insertions(+)

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 292308d..8eb10d5 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -34,6 +34,7 @@
 #include "xfs_trace.h"
 #include "xfs_fsops.h"
 #include "xfs_cksum.h"
+#include "xfs_sysfs.h"
 
 kmem_zone_t	*xfs_log_ticket_zone;
 
@@ -707,6 +708,11 @@ xfs_log_mount(
 		}
 	}
 
+	error = xfs_sysfs_init(&mp->m_log->l_kobject, &xfs_log_ktype,
+			&mp->m_log->l_kobject_complete, &mp->m_kobject, "log");
+	if (error)
+		goto out_destroy_ail;
+
 	/* Normal transactions can now occur */
 	mp->m_log->l_flags &= ~XLOG_ACTIVE_RECOVERY;
 
@@ -947,6 +953,9 @@ xfs_log_unmount(
 	xfs_log_quiesce(mp);
 
 	xfs_trans_ail_destroy(mp);
+
+	xfs_sysfs_del(&mp->m_log->l_kobject, &mp->m_log->l_kobject_complete);
+
 	xlog_dealloc_log(mp->m_log);
 }
 
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index 9bc403a..ce1eee2 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -405,6 +405,9 @@ struct xlog {
 	struct xlog_grant_head	l_reserve_head;
 	struct xlog_grant_head	l_write_head;
 
+	struct kobject		l_kobject;
+	struct completion	l_kobject_complete;
+
 	/* The following field are used for debugging; need to hold icloglock */
 #ifdef DEBUG
 	char			*l_iclog_bak[XLOG_MAX_ICLOGS];
diff --git a/fs/xfs/xfs_sysfs.c b/fs/xfs/xfs_sysfs.c
index 41365fe..f837527 100644
--- a/fs/xfs/xfs_sysfs.c
+++ b/fs/xfs/xfs_sysfs.c
@@ -54,3 +54,56 @@ xfs_mp_release(struct kobject *kobj)
 struct kobj_type xfs_mp_ktype = {
 	.release = xfs_mp_release,
 };
+
+/* xlog */
+
+static struct attribute *xfs_log_attrs[] = {
+	NULL,
+};
+
+STATIC ssize_t
+xfs_log_show(
+	struct kobject		*kobj,
+	struct attribute	*attr,
+	char			*buf)
+{
+	struct xlog *log = container_of(kobj, struct xlog, l_kobject);
+	struct xfs_sysfs_attr *xfs_attr = container_of(attr,
+		struct xfs_sysfs_attr, attr);
+
+	return xfs_attr->show ? xfs_attr->show(buf, log) : 0;
+}
+
+STATIC ssize_t
+xfs_log_store(
+	struct kobject		*kobj,
+	struct attribute	*attr,
+	const char		*buf,
+	size_t			count)
+{
+	struct xlog *log = container_of(kobj, struct xlog, l_kobject);
+	struct xfs_sysfs_attr *xfs_attr = container_of(attr,
+		struct xfs_sysfs_attr, attr);
+
+	return xfs_attr->store ? xfs_attr->store(buf, count, log) : 0;
+}
+
+static struct sysfs_ops xfs_log_ops = {
+	.show = xfs_log_show,
+	.store = xfs_log_store,
+};
+
+STATIC void
+xfs_log_release(struct kobject *kobj)
+{
+	struct xlog *log = container_of(kobj, struct xlog, l_kobject);
+
+	complete(&log->l_kobject_complete);
+}
+
+struct kobj_type xfs_log_ktype = {
+	.release = xfs_log_release,
+	.sysfs_ops = &xfs_log_ops,
+	.default_attrs = xfs_log_attrs,
+};
+
diff --git a/fs/xfs/xfs_sysfs.h b/fs/xfs/xfs_sysfs.h
index c885acf..469f218 100644
--- a/fs/xfs/xfs_sysfs.h
+++ b/fs/xfs/xfs_sysfs.h
@@ -20,6 +20,7 @@
 #define __XFS_SYSFS_H__
 
 extern struct kobj_type xfs_mp_ktype;	/* xfs_mount */
+extern struct kobj_type xfs_log_ktype;	/* xlog */
 
 static inline int
 xfs_sysfs_init(
-- 
1.8.3.1

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