proc: move /proc/filesystems to fs/filesystems.c

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/fs/filesystems.c b/fs/filesystems.c
index f37f87262837..d0e20ced62dd 100644
--- a/fs/filesystems.c
+++ b/fs/filesystems.c
@@ -8,6 +8,8 @@
 
 #include <linux/syscalls.h>
 #include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/kmod.h>
 #include <linux/init.h>
@@ -214,6 +216,43 @@ int get_filesystem_list(char * buf)
         return len;
 }
 
+#ifdef CONFIG_PROC_FS
+static int filesystems_proc_show(struct seq_file *m, void *v)
+{
+        struct file_system_type * tmp;
+
+        read_lock(&file_systems_lock);
+        tmp = file_systems;
+        while (tmp) {
+                seq_printf(m, "%s\t%s\n",
+                        (tmp->fs_flags & FS_REQUIRES_DEV) ? "" : "nodev",
+                        tmp->name);
+                tmp = tmp->next;
+        }
+        read_unlock(&file_systems_lock);
+        return 0;
+}
+
+static int filesystems_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, filesystems_proc_show, NULL);
+}
+
+static const struct file_operations filesystems_proc_fops = {
+        .open           = filesystems_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int __init proc_filesystems_init(void)
+{
+        proc_create("filesystems", 0, NULL, &filesystems_proc_fops);
+        return 0;
+}
+module_init(proc_filesystems_init);
+#endif
+
 struct file_system_type *get_fs_type(const char *name)
 {
         struct file_system_type *fs;