#include <linux/exportfs.h>
#include <linux/writeback.h>
#include <linux/buffer_head.h> /* sync_mapping_buffers */
+#include <linux/fs_context.h>
+#include <linux/pseudo_fs.h>
#include <linux/uaccess.h>
.statfs = simple_statfs,
};
+static int pseudo_fs_get_tree(struct fs_context *fc)
+{
+ struct pseudo_fs_context *ctx = fc->fs_private;
+ struct dentry *root;
+
+ root = mount_pseudo_xattr(fc->fs_type,
+ ctx->ops, ctx->xattr,
+ ctx->dops, ctx->magic);
+ if (IS_ERR(root))
+ return PTR_ERR(root);
+
+ fc->root = root;
+ return 0;
+}
+
+static void pseudo_fs_free(struct fs_context *fc)
+{
+ kfree(fc->fs_private);
+}
+
+static const struct fs_context_operations pseudo_fs_context_ops = {
+ .free = pseudo_fs_free,
+ .get_tree = pseudo_fs_get_tree,
+};
+
+/*
+ * Common helper for pseudo-filesystems (sockfs, pipefs, bdev - stuff that
+ * will never be mountable)
+ */
+struct pseudo_fs_context *init_pseudo(struct fs_context *fc,
+ unsigned long magic)
+{
+ struct pseudo_fs_context *ctx;
+
+ ctx = kzalloc(sizeof(struct pseudo_fs_context), GFP_KERNEL);
+ if (likely(ctx)) {
+ ctx->magic = magic;
+ fc->fs_private = ctx;
+ fc->ops = &pseudo_fs_context_ops;
+ }
+ return ctx;
+}
+EXPORT_SYMBOL(init_pseudo);
+
/*
* Common helper for pseudo-filesystems (sockfs, pipefs, bdev - stuff that
* will never be mountable)
--- /dev/null
+#ifndef __LINUX_PSEUDO_FS__
+#define __LINUX_PSEUDO_FS__
+
+#include <linux/fs_context.h>
+
+struct pseudo_fs_context {
+ const struct super_operations *ops;
+ const struct xattr_handler **xattr;
+ const struct dentry_operations *dops;
+ unsigned long magic;
+};
+
+struct pseudo_fs_context *init_pseudo(struct fs_context *fc,
+ unsigned long magic);
+
+#endif