From df6ba7015dd3a64a2e74353d1e7d19871af86f38 Mon Sep 17 00:00:00 2001 From: Ilya Dryomov Date: Sat, 20 Jan 2018 10:30:10 +0100 Subject: [PATCH] rbd: remove bio cloning helpers Signed-off-by: Ilya Dryomov Reviewed-by: Alex Elder --- drivers/block/rbd.c | 141 -------------------------------------------- 1 file changed, 141 deletions(-) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 8eaebf609611..8b9047369ab9 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -444,8 +444,6 @@ static DEFINE_SPINLOCK(rbd_client_list_lock); static struct kmem_cache *rbd_img_request_cache; static struct kmem_cache *rbd_obj_request_cache; -static struct bio_set *rbd_bio_clone; - static int rbd_major; static DEFINE_IDA(rbd_dev_id_ida); @@ -1276,49 +1274,6 @@ static void zero_bios(struct ceph_bio_iter *bio_pos, u32 off, u32 bytes) })); } -/* - * bio helpers - */ - -static void bio_chain_put(struct bio *chain) -{ - struct bio *tmp; - - while (chain) { - tmp = chain; - chain = chain->bi_next; - bio_put(tmp); - } -} - -/* - * zeros a bio chain, starting at specific offset - */ -static void zero_bio_chain(struct bio *chain, int start_ofs) -{ - struct bio_vec bv; - struct bvec_iter iter; - unsigned long flags; - void *buf; - int pos = 0; - - while (chain) { - bio_for_each_segment(bv, chain, iter) { - if (pos + bv.bv_len > start_ofs) { - int remainder = max(start_ofs - pos, 0); - buf = bvec_kmap_irq(&bv, &flags); - memset(buf + remainder, 0, - bv.bv_len - remainder); - flush_dcache_page(bv.bv_page); - bvec_kunmap_irq(buf, &flags); - } - pos += bv.bv_len; - } - - chain = chain->bi_next; - } -} - /* * similar to zero_bio_chain(), zeros data defined by a page array, * starting at the given byte offset from the start of the array and @@ -1351,90 +1306,6 @@ static void zero_pages(struct page **pages, u64 offset, u64 end) } } -/* - * Clone a portion of a bio, starting at the given byte offset - * and continuing for the number of bytes indicated. - */ -static struct bio *bio_clone_range(struct bio *bio_src, - unsigned int offset, - unsigned int len, - gfp_t gfpmask) -{ - struct bio *bio; - - bio = bio_clone_fast(bio_src, gfpmask, rbd_bio_clone); - if (!bio) - return NULL; /* ENOMEM */ - - bio_advance(bio, offset); - bio->bi_iter.bi_size = len; - - return bio; -} - -/* - * Clone a portion of a bio chain, starting at the given byte offset - * into the first bio in the source chain and continuing for the - * number of bytes indicated. The result is another bio chain of - * exactly the given length, or a null pointer on error. - * - * The bio_src and offset parameters are both in-out. On entry they - * refer to the first source bio and the offset into that bio where - * the start of data to be cloned is located. - * - * On return, bio_src is updated to refer to the bio in the source - * chain that contains first un-cloned byte, and *offset will - * contain the offset of that byte within that bio. - */ -static struct bio *bio_chain_clone_range(struct bio **bio_src, - unsigned int *offset, - unsigned int len, - gfp_t gfpmask) -{ - struct bio *bi = *bio_src; - unsigned int off = *offset; - struct bio *chain = NULL; - struct bio **end; - - /* Build up a chain of clone bios up to the limit */ - - if (!bi || off >= bi->bi_iter.bi_size || !len) - return NULL; /* Nothing to clone */ - - end = &chain; - while (len) { - unsigned int bi_size; - struct bio *bio; - - if (!bi) { - rbd_warn(NULL, "bio_chain exhausted with %u left", len); - goto out_err; /* EINVAL; ran out of bio's */ - } - bi_size = min_t(unsigned int, bi->bi_iter.bi_size - off, len); - bio = bio_clone_range(bi, off, bi_size, gfpmask); - if (!bio) - goto out_err; /* ENOMEM */ - - *end = bio; - end = &bio->bi_next; - - off += bi_size; - if (off == bi->bi_iter.bi_size) { - bi = bi->bi_next; - off = 0; - } - len -= bi_size; - } - *bio_src = bi; - *offset = off; - - return chain; -out_err: - bio_chain_put(chain); - - return NULL; -} - /* * The default/initial value for all object request flags is 0. For * each flag, once its value is set to 1 it is never reset to 0 @@ -6390,16 +6261,8 @@ static int rbd_slab_init(void) if (!rbd_obj_request_cache) goto out_err; - rbd_assert(!rbd_bio_clone); - rbd_bio_clone = bioset_create(BIO_POOL_SIZE, 0, 0); - if (!rbd_bio_clone) - goto out_err_clone; - return 0; -out_err_clone: - kmem_cache_destroy(rbd_obj_request_cache); - rbd_obj_request_cache = NULL; out_err: kmem_cache_destroy(rbd_img_request_cache); rbd_img_request_cache = NULL; @@ -6415,10 +6278,6 @@ static void rbd_slab_exit(void) rbd_assert(rbd_img_request_cache); kmem_cache_destroy(rbd_img_request_cache); rbd_img_request_cache = NULL; - - rbd_assert(rbd_bio_clone); - bioset_free(rbd_bio_clone); - rbd_bio_clone = NULL; } static int __init rbd_init(void) -- 2.30.2