| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | /* |
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| 3 | * Common helpers for stackable filesystems and backing files. |
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| 4 | * |
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| 5 | * Copyright (C) 2023 CTERA Networks. |
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| 6 | */ |
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| 7 | |
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| 8 | #ifndef _LINUX_BACKING_FILE_H |
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| 9 | #define _LINUX_BACKING_FILE_H |
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| 10 | |
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| 11 | #include <linux/file.h> |
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| 12 | #include <linux/uio.h> |
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| 13 | #include <linux/fs.h> |
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| 14 | |
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| 15 | struct backing_file_ctx { |
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| 16 | const struct cred *cred; |
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| 17 | void (*accessed)(struct file *file); |
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| 18 | void (*end_write)(struct kiocb *iocb, ssize_t); |
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| 19 | }; |
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| 20 | |
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| 21 | struct file *backing_file_open(const struct path *user_path, int flags, |
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| 22 | const struct path *real_path, |
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| 23 | const struct cred *cred); |
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| 24 | struct file *backing_tmpfile_open(const struct path *user_path, int flags, |
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| 25 | const struct path *real_parentpath, |
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| 26 | umode_t mode, const struct cred *cred); |
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| 27 | ssize_t backing_file_read_iter(struct file *file, struct iov_iter *iter, |
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| 28 | struct kiocb *iocb, int flags, |
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| 29 | struct backing_file_ctx *ctx); |
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| 30 | ssize_t backing_file_write_iter(struct file *file, struct iov_iter *iter, |
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| 31 | struct kiocb *iocb, int flags, |
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| 32 | struct backing_file_ctx *ctx); |
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| 33 | ssize_t backing_file_splice_read(struct file *in, struct kiocb *iocb, |
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| 34 | struct pipe_inode_info *pipe, size_t len, |
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| 35 | unsigned int flags, |
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| 36 | struct backing_file_ctx *ctx); |
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| 37 | ssize_t backing_file_splice_write(struct pipe_inode_info *pipe, |
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| 38 | struct file *out, struct kiocb *iocb, |
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| 39 | size_t len, unsigned int flags, |
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| 40 | struct backing_file_ctx *ctx); |
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| 41 | int backing_file_mmap(struct file *file, struct vm_area_struct *vma, |
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| 42 | struct backing_file_ctx *ctx); |
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| 43 | |
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| 44 | #endif /* _LINUX_BACKING_FILE_H */ |
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| 45 | |
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