[PATCH RFC 1/6] pseudofs: add support for export_ops

Christian Brauner
2024-11-29T13:39:22Z

From: Erin Shepherd <erin.shepherd@e43.eu>

Pseudo-filesystems might reasonably wish to implement the export ops
(particularly for name_to_handle_at/open_by_handle_at); plumb this
through pseudo_fs_context

Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Erin Shepherd <erin.shepherd@e43.eu>
Link: https://lore.kernel.org/r/20241113-pidfs_fh-v2-1-9a4d28155a37@e43.eu
Signed-off-by: Christian Brauner <brauner@kernel.org>
---
fs/libfs.c | 1 +
include/linux/pseudo_fs.h | 1 +
2 files changed, 2 insertions(+)

diff --git a/fs/libfs.c b/fs/libfs.c
index 748ac59231547c29abcbade3fa025e3b00533d8b..2890a9c4a414b7e2be5c337e238db84743f0a30b 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -673,6 +673,7 @@ static int pseudo_fs_fill_super(struct super_block *s, struct fs_context *fc)
s->s_blocksize_bits = PAGE_SHIFT;
s->s_magic = ctx->magic;
s->s_op = ctx->ops ?: &simple_super_operations;
+ s->s_export_op = ctx->eops;
s->s_xattr = ctx->xattr;
s->s_time_gran = 1;
root = new_inode(s);
diff --git a/include/linux/pseudo_fs.h b/include/linux/pseudo_fs.h
index 730f77381d55f1816ef14adf7dd2cf1d62bb912c..2503f7625d65e7b1fbe9e64d5abf06cd8f017b5f 100644
--- a/include/linux/pseudo_fs.h
+++ b/include/linux/pseudo_fs.h
@@ -5,6 +5,7 @@

struct pseudo_fs_context {
const struct super_operations *ops;
+ const struct export_operations *eops;
const struct xattr_handler * const *xattr;
const struct dentry_operations *dops;
unsigned long magic;

--
2.45.2