77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2018-2023 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <djwong@kernel.org>
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*/
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#ifndef __XFS_SCRUB_XFILE_H__
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#define __XFS_SCRUB_XFILE_H__
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struct xfile_page {
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struct page *page;
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void *fsdata;
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loff_t pos;
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};
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static inline bool xfile_page_cached(const struct xfile_page *xfpage)
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{
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return xfpage->page != NULL;
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}
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static inline pgoff_t xfile_page_index(const struct xfile_page *xfpage)
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{
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return xfpage->page->index;
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}
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struct xfile {
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struct file *file;
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};
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int xfile_create(const char *description, loff_t isize, struct xfile **xfilep);
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void xfile_destroy(struct xfile *xf);
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ssize_t xfile_pread(struct xfile *xf, void *buf, size_t count, loff_t pos);
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ssize_t xfile_pwrite(struct xfile *xf, const void *buf, size_t count,
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loff_t pos);
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/*
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* Load an object. Since we're treating this file as "memory", any error or
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* short IO is treated as a failure to allocate memory.
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*/
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static inline int
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xfile_obj_load(struct xfile *xf, void *buf, size_t count, loff_t pos)
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{
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ssize_t ret = xfile_pread(xf, buf, count, pos);
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if (ret < 0 || ret != count)
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return -ENOMEM;
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return 0;
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}
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/*
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* Store an object. Since we're treating this file as "memory", any error or
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* short IO is treated as a failure to allocate memory.
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*/
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static inline int
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xfile_obj_store(struct xfile *xf, const void *buf, size_t count, loff_t pos)
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{
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ssize_t ret = xfile_pwrite(xf, buf, count, pos);
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if (ret < 0 || ret != count)
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return -ENOMEM;
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return 0;
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}
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loff_t xfile_seek_data(struct xfile *xf, loff_t pos);
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struct xfile_stat {
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loff_t size;
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unsigned long long bytes;
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};
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int xfile_stat(struct xfile *xf, struct xfile_stat *statbuf);
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int xfile_get_page(struct xfile *xf, loff_t offset, unsigned int len,
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struct xfile_page *xbuf);
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int xfile_put_page(struct xfile *xf, struct xfile_page *xbuf);
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#endif /* __XFS_SCRUB_XFILE_H__ */
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