/* * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. * * This file is released under the GPL. */ #ifndef DM_BIO_RECORD_H #define DM_BIO_RECORD_H #include <linux/bio.h> /* * There are lots of mutable fields in the bio struct that get * changed by the lower levels of the block layer. Some targets, * such as multipath, may wish to resubmit a bio on error. The * functions in this file help the target record and restore the * original bio state. */ struct dm_bio_vec_details { #if PAGE_SIZE < 65536 __u16 bv_len; __u16 bv_offset; #else unsigned bv_len; unsigned bv_offset; #endif }; struct dm_bio_details { sector_t bi_sector; struct block_device *bi_bdev; unsigned int bi_size; unsigned short bi_idx; unsigned long bi_flags; struct dm_bio_vec_details bi_io_vec[BIO_MAX_PAGES]; }; static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio) { unsigned i; bd->bi_sector = bio->bi_sector; bd->bi_bdev = bio->bi_bdev; bd->bi_size = bio->bi_size; bd->bi_idx = bio->bi_idx; bd->bi_flags = bio->bi_flags; for (i = 0; i < bio->bi_vcnt; i++) { bd->bi_io_vec[i].bv_len = bio->bi_io_vec[i].bv_len; bd->bi_io_vec[i].bv_offset = bio->bi_io_vec[i].bv_offset; } } static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio) { unsigned i; bio->bi_sector = bd->bi_sector; bio->bi_bdev = bd->bi_bdev; bio->bi_size = bd->bi_size; bio->bi_idx = bd->bi_idx; bio->bi_flags = bd->bi_flags; for (i = 0; i < bio->bi_vcnt; i++) { bio->bi_io_vec[i].bv_len = bd->bi_io_vec[i].bv_len; bio->bi_io_vec[i].bv_offset = bd->bi_io_vec[i].bv_offset; } } #endif