[PATCH] Add fs_subsys to enable filesystems to use sysfs

This creates an "fs" subdirectory in sysfs so that GFS2 (or any other
filesystem, come to that) can make use of sysfs.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/namespace.c b/fs/namespace.c
index 8bc15b362d239f211ca0e28a1054df9b2094804c..ce97becff4611c0fae4e90ce655bd8cffe850c77 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -48,6 +48,10 @@ static int hash_mask __read_mostly, hash_bits __read_mostly;
 static kmem_cache_t *mnt_cache;
 static struct rw_semaphore namespace_sem;
 
+/* /sys/fs */
+decl_subsys(fs, NULL, NULL);
+EXPORT_SYMBOL_GPL(fs_subsys);
+
 static inline unsigned long hash(struct vfsmount *mnt, struct dentry *dentry)
 {
        unsigned long tmp = ((unsigned long)mnt / L1_CACHE_BYTES);
@@ -1725,6 +1729,7 @@ void __init mnt_init(unsigned long mempages)
                i--;
        } while (i);
        sysfs_init();
+       subsystem_register(&fs_subsys);
        init_rootfs();
        init_mount_tree();
 }

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 552cedfa606449a51dc05d1ae548453089134e45..eabc80d22bbcb5f0a7a4dc000c0a93ee3769a495 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1293,6 +1293,9 @@ extern int vfs_statfs(struct super_block *, struct kstatfs *);
 #define FLOCK_VERIFY_READ  1
 #define FLOCK_VERIFY_WRITE 2
 
+/* /sys/fs */
+extern struct subsystem fs_subsys;
+
 extern int locks_mandatory_locked(struct inode *);
 extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t);