projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 6ad5b325 CH |
1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* | |
| 3 | * Copyright (c) 2019 Christoph Hellwig. | |
| 4 | */ | |
| 5 | #include "xfs.h" | |
| 6 | ||
| 7 | static inline unsigned int bio_max_vecs(unsigned int count) | |
| 8 | { | |
| 5f7136db | 9 | return bio_max_segs(howmany(count, PAGE_SIZE)); |
| 6ad5b325 CH |
10 | } |
| 11 | ||
| 12 | int | |
| 13 | xfs_rw_bdev( | |
| 14 | struct block_device *bdev, | |
| 15 | sector_t sector, | |
| 16 | unsigned int count, | |
| 17 | char *data, | |
| d03025ae | 18 | enum req_op op) |
| 6ad5b325 CH |
19 | |
| 20 | { | |
| 21 | unsigned int is_vmalloc = is_vmalloc_addr(data); | |
| 22 | unsigned int left = count; | |
| 23 | int error; | |
| 24 | struct bio *bio; | |
| 25 | ||
| 26 | if (is_vmalloc && op == REQ_OP_WRITE) | |
| 27 | flush_kernel_vmap_range(data, count); | |
| 28 | ||
| 07888c66 CH |
29 | bio = bio_alloc(bdev, bio_max_vecs(left), op | REQ_META | REQ_SYNC, |
| 30 | GFP_KERNEL); | |
| 6ad5b325 | 31 | bio->bi_iter.bi_sector = sector; |
| 6ad5b325 CH |
32 | |
| 33 | do { | |
| 34 | struct page *page = kmem_to_page(data); | |
| 35 | unsigned int off = offset_in_page(data); | |
| 36 | unsigned int len = min_t(unsigned, left, PAGE_SIZE - off); | |
| 37 | ||
| 38 | while (bio_add_page(bio, page, len, off) != len) { | |
| 39 | struct bio *prev = bio; | |
| 40 | ||
| 07888c66 CH |
41 | bio = bio_alloc(prev->bi_bdev, bio_max_vecs(left), |
| 42 | prev->bi_opf, GFP_KERNEL); | |
| 6ad5b325 | 43 | bio->bi_iter.bi_sector = bio_end_sector(prev); |
| 488ca3d8 | 44 | bio_chain(prev, bio); |
| 6ad5b325 CH |
45 | |
| 46 | submit_bio(prev); | |
| 47 | } | |
| 48 | ||
| 49 | data += len; | |
| 50 | left -= len; | |
| 51 | } while (left > 0); | |
| 52 | ||
| 53 | error = submit_bio_wait(bio); | |
| 54 | bio_put(bio); | |
| 55 | ||
| 56 | if (is_vmalloc && op == REQ_OP_READ) | |
| 57 | invalidate_kernel_vmap_range(data, count); | |
| 58 | return error; | |
| 59 | } |