[PATCH v2 2/6] xfs: add a sysfs kset

Brian Foster
2014-06-27T12:07:07Z

Create a sysfs kset to contain all sub-objects associated with the XFS
module. The kset is created and removed on module initialization and
removal respectively. The kset uses fs_obj as a parent. This leads to
the creation of a /sys/fs/xfs directory when the kset exists.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
---
fs/xfs/xfs_super.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index f2e5f8a..986c557 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -61,6 +61,7 @@
static const struct super_operations xfs_super_operations;
static kmem_zone_t *xfs_ioend_zone;
mempool_t *xfs_ioend_pool;
+struct kset *xfs_kset;

#define MNTOPT_LOGBUFS "logbufs" /* number of XFS log buffers */
#define MNTOPT_LOGBSIZE "logbsize" /* size of XFS log buffers */
@@ -1761,9 +1762,15 @@ init_xfs_fs(void)
if (error)
goto out_cleanup_procfs;

+ xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
+ if (!xfs_kset) {
+ error = -ENOMEM;
+ goto out_sysctl_unregister;;
+ }
+
error = xfs_qm_init();
if (error)
- goto out_sysctl_unregister;
+ goto out_kset_unregister;

error = register_filesystem(&xfs_fs_type);
if (error)
@@ -1772,6 +1779,8 @@ init_xfs_fs(void)

out_qm_exit:
xfs_qm_exit();
+ out_kset_unregister:
+ kset_unregister(xfs_kset);
out_sysctl_unregister:
xfs_sysctl_unregister();
out_cleanup_procfs:
@@ -1793,6 +1802,7 @@ exit_xfs_fs(void)
{
xfs_qm_exit();
unregister_filesystem(&xfs_fs_type);
+ kset_unregister(xfs_kset);
xfs_sysctl_unregister();
xfs_cleanup_procfs();
xfs_buf_terminate();