include/linux/interrupt.h: do not include linux/irqnr.h twice

[cascardo/linux.git] / fs / filesystems.c

diff --git a/fs/filesystems.c b/fs/filesystems.c
index f37f872..d488dcd 100644 (file)
--- 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>
@@ -214,24 +216,64 @@ int get_filesystem_list(char * buf)
        return len;
 }
 
-struct file_system_type *get_fs_type(const char *name)
+#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
+
+static struct file_system_type *__get_fs_type(const char *name, int len)
 {
        struct file_system_type *fs;
-       const char *dot = strchr(name, '.');
-       unsigned len = dot ? dot - name : strlen(name);
 
        read_lock(&file_systems_lock);
        fs = *(find_filesystem(name, len));
        if (fs && !try_module_get(fs->owner))
                fs = NULL;
        read_unlock(&file_systems_lock);
-       if (!fs && (request_module("%.*s", len, name) == 0)) {
-               read_lock(&file_systems_lock);
-               fs = *(find_filesystem(name, len));
-               if (fs && !try_module_get(fs->owner))
-                       fs = NULL;
-               read_unlock(&file_systems_lock);
-       }
+       return fs;
+}
+
+struct file_system_type *get_fs_type(const char *name)
+{
+       struct file_system_type *fs;
+       const char *dot = strchr(name, '.');
+       int len = dot ? dot - name : strlen(name);
+
+       fs = __get_fs_type(name, len);
+       if (!fs && (request_module("%.*s", len, name) == 0))
+               fs = __get_fs_type(name, len);
 
        if (dot && fs && !(fs->fs_flags & FS_HAS_SUBTYPE)) {
                put_filesystem(fs);