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