Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright (c) 2019 Christoph Hellwig.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include "xfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) static inline unsigned int bio_max_vecs(unsigned int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 	return min_t(unsigned, howmany(count, PAGE_SIZE), BIO_MAX_PAGES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) xfs_rw_bdev(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 	struct block_device	*bdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	sector_t		sector,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	unsigned int		count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	char			*data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	unsigned int		op)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	unsigned int		is_vmalloc = is_vmalloc_addr(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	unsigned int		left = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	int			error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	struct bio		*bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	if (is_vmalloc && op == REQ_OP_WRITE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 		flush_kernel_vmap_range(data, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	bio = bio_alloc(GFP_KERNEL, bio_max_vecs(left));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	bio_set_dev(bio, bdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	bio->bi_iter.bi_sector = sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	bio->bi_opf = op | REQ_META | REQ_SYNC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		struct page	*page = kmem_to_page(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		unsigned int	off = offset_in_page(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		unsigned int	len = min_t(unsigned, left, PAGE_SIZE - off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		while (bio_add_page(bio, page, len, off) != len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 			struct bio	*prev = bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 			bio = bio_alloc(GFP_KERNEL, bio_max_vecs(left));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 			bio_copy_dev(bio, prev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 			bio->bi_iter.bi_sector = bio_end_sector(prev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 			bio->bi_opf = prev->bi_opf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 			bio_chain(prev, bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 			submit_bio(prev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		data += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		left -= len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	} while (left > 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	error = submit_bio_wait(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	bio_put(bio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	if (is_vmalloc && op == REQ_OP_READ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 		invalidate_kernel_vmap_range(data, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }