1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) 2018-2023 Oracle. All Rights Reserved. 4 * Author: Darrick J. Wong <djwong@kernel.org> 5 */ 6 #ifndef __XFS_SCRUB_XFILE_H__ 7 #define __XFS_SCRUB_XFILE_H__ 8 9 struct xfile_page { 10 struct page *page; 11 void *fsdata; 12 loff_t pos; 13 }; 14 15 static inline bool xfile_page_cached(const struct xfile_page *xfpage) 16 { 17 return xfpage->page != NULL; 18 } 19 20 static inline pgoff_t xfile_page_index(const struct xfile_page *xfpage) 21 { 22 return xfpage->page->index; 23 } 24 25 struct xfile { 26 struct file *file; 27 }; 28 29 int xfile_create(const char *description, loff_t isize, struct xfile **xfilep); 30 void xfile_destroy(struct xfile *xf); 31 32 ssize_t xfile_pread(struct xfile *xf, void *buf, size_t count, loff_t pos); 33 ssize_t xfile_pwrite(struct xfile *xf, const void *buf, size_t count, 34 loff_t pos); 35 36 /* 37 * Load an object. Since we're treating this file as "memory", any error or 38 * short IO is treated as a failure to allocate memory. 39 */ 40 static inline int 41 xfile_obj_load(struct xfile *xf, void *buf, size_t count, loff_t pos) 42 { 43 ssize_t ret = xfile_pread(xf, buf, count, pos); 44 45 if (ret < 0 || ret != count) 46 return -ENOMEM; 47 return 0; 48 } 49 50 /* 51 * Store an object. Since we're treating this file as "memory", any error or 52 * short IO is treated as a failure to allocate memory. 53 */ 54 static inline int 55 xfile_obj_store(struct xfile *xf, const void *buf, size_t count, loff_t pos) 56 { 57 ssize_t ret = xfile_pwrite(xf, buf, count, pos); 58 59 if (ret < 0 || ret != count) 60 return -ENOMEM; 61 return 0; 62 } 63 64 loff_t xfile_seek_data(struct xfile *xf, loff_t pos); 65 66 struct xfile_stat { 67 loff_t size; 68 unsigned long long bytes; 69 }; 70 71 int xfile_stat(struct xfile *xf, struct xfile_stat *statbuf); 72 73 int xfile_get_page(struct xfile *xf, loff_t offset, unsigned int len, 74 struct xfile_page *xbuf); 75 int xfile_put_page(struct xfile *xf, struct xfile_page *xbuf); 76 77 #endif /* __XFS_SCRUB_XFILE_H__ */ 78