pidfs: make inodes mutable

Prepare for allowing extended attributes to be set on pidfd inodes by
allowing them to be mutable.

Link: https://lore.kernel.org/20250618-work-pidfs-persistent-v2-11-98f3456fd552@kernel.org
Reviewed-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/fs/pidfs.c b/fs/pidfs.c
index ec375692a710c805bcb3011316061d92752e8439..df5bc69ea1c0bbbe3002f4dfd6bd65f4d13c8138 100644 (file)
--- a/fs/pidfs.c
+++ b/fs/pidfs.c
@@ -827,6 +827,8 @@ static int pidfs_init_inode(struct inode *inode, void *data)
 
        inode->i_private = data;
        inode->i_flags |= S_PRIVATE | S_ANON_INODE;
+       /* We allow to set xattrs. */
+       inode->i_flags &= ~S_IMMUTABLE;
        inode->i_mode |= S_IRWXU;
        inode->i_op = &pidfs_inode_operations;
        inode->i_fop = &pidfs_file_operations;