1f91a704fSAmir Goldstein /* SPDX-License-Identifier: GPL-2.0-only */ 2f91a704fSAmir Goldstein /* 3f91a704fSAmir Goldstein * Common helpers for stackable filesystems and backing files. 4f91a704fSAmir Goldstein * 5f91a704fSAmir Goldstein * Copyright (C) 2023 CTERA Networks. 6f91a704fSAmir Goldstein */ 7f91a704fSAmir Goldstein 8f91a704fSAmir Goldstein #ifndef _LINUX_BACKING_FILE_H 9f91a704fSAmir Goldstein #define _LINUX_BACKING_FILE_H 10f91a704fSAmir Goldstein 11f91a704fSAmir Goldstein #include <linux/file.h> 12a6293b3eSAmir Goldstein #include <linux/uio.h> 13a6293b3eSAmir Goldstein #include <linux/fs.h> 14a6293b3eSAmir Goldstein 15a6293b3eSAmir Goldstein struct backing_file_ctx { 16a6293b3eSAmir Goldstein const struct cred *cred; 17*48b50624SMiklos Szeredi void (*accessed)(struct file *file); 18*48b50624SMiklos Szeredi void (*end_write)(struct kiocb *iocb, ssize_t); 19a6293b3eSAmir Goldstein }; 20f91a704fSAmir Goldstein 21f91a704fSAmir Goldstein struct file *backing_file_open(const struct path *user_path, int flags, 22f91a704fSAmir Goldstein const struct path *real_path, 23f91a704fSAmir Goldstein const struct cred *cred); 249a87907dSMiklos Szeredi struct file *backing_tmpfile_open(const struct path *user_path, int flags, 259a87907dSMiklos Szeredi const struct path *real_parentpath, 269a87907dSMiklos Szeredi umode_t mode, const struct cred *cred); 27a6293b3eSAmir Goldstein ssize_t backing_file_read_iter(struct file *file, struct iov_iter *iter, 28a6293b3eSAmir Goldstein struct kiocb *iocb, int flags, 29a6293b3eSAmir Goldstein struct backing_file_ctx *ctx); 30a6293b3eSAmir Goldstein ssize_t backing_file_write_iter(struct file *file, struct iov_iter *iter, 31a6293b3eSAmir Goldstein struct kiocb *iocb, int flags, 32a6293b3eSAmir Goldstein struct backing_file_ctx *ctx); 33*48b50624SMiklos Szeredi ssize_t backing_file_splice_read(struct file *in, struct kiocb *iocb, 349b7e9e2fSAmir Goldstein struct pipe_inode_info *pipe, size_t len, 359b7e9e2fSAmir Goldstein unsigned int flags, 369b7e9e2fSAmir Goldstein struct backing_file_ctx *ctx); 379b7e9e2fSAmir Goldstein ssize_t backing_file_splice_write(struct pipe_inode_info *pipe, 38*48b50624SMiklos Szeredi struct file *out, struct kiocb *iocb, 39*48b50624SMiklos Szeredi size_t len, unsigned int flags, 409b7e9e2fSAmir Goldstein struct backing_file_ctx *ctx); 41f567377eSAmir Goldstein int backing_file_mmap(struct file *file, struct vm_area_struct *vma, 42f567377eSAmir Goldstein struct backing_file_ctx *ctx); 43f91a704fSAmir Goldstein 44f91a704fSAmir Goldstein #endif /* _LINUX_BACKING_FILE_H */ 45