4753374b1b
Previously when user tried to allocate to big bio he recieved NULL. As the behavior was changed to `BUG()` passing out of range value is no longer legal. Limiting the requested bio size to BIO_MAX_PAGES (on the older kernels) or to BIO_MAX_VECS (on the newer ones) eliminates the problem as the macros represent the max possible value. Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
131 lines
3.0 KiB
C
131 lines
3.0 KiB
C
/*
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* Copyright(c) 2012-2022 Intel Corporation
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef __VOL_BLK_UTILS_H__
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#define __VOL_BLK_UTILS_H__
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#include "obj_blk.h"
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#include "context.h"
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struct blkio {
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int error;
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atomic_t rq_remaning;
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atomic_t ref_counter;
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int32_t dir;
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struct blk_data *data; /* IO data buffer */
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/* BIO vector iterator for sending IO */
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struct bio_vec_iter iter;
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};
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static inline struct blkio *cas_io_to_blkio(struct ocf_io *io)
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{
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return ocf_io_get_priv(io);
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}
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int cas_blk_io_set_data(struct ocf_io *io, ctx_data_t *data,
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uint32_t offset);
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ctx_data_t *cas_blk_io_get_data(struct ocf_io *io);
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int cas_blk_open_volume_by_bdev(ocf_volume_t *vol,
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struct block_device *bdev);
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void cas_blk_close_volume(ocf_volume_t vol);
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int cas_blk_identify_type(const char *path, uint8_t *type);
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static inline void cas_io_iter_init(struct bio_vec_iter *iter,
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struct bio_vec *vec, uint32_t vec_size)
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{
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iter->vec = iter->ivec = vec;
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iter->vec_size = vec_size;
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iter->idx = 0;
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iter->offset = vec->bv_offset;
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iter->len = vec->bv_len;
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}
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static inline void cas_io_iter_set(struct bio_vec_iter *iter,
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struct bio_vec *vec, uint32_t vec_size,
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uint32_t idx, uint32_t offset, uint32_t len)
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{
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iter->vec = vec;
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iter->vec_size = vec_size;
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iter->idx = idx;
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iter->offset = offset;
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iter->len = len;
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if (iter->idx < vec_size) {
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iter->ivec = &vec[iter->idx];
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} else {
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iter->ivec = NULL;
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WARN(1, "Setting offset out of BIO vector");
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}
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}
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static inline void cas_io_iter_copy_set(struct bio_vec_iter *dst,
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struct bio_vec_iter *src)
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{
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dst->vec = src->vec;
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dst->vec_size = src->vec_size;
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dst->idx = src->idx;
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dst->offset = src->offset;
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dst->len = src->len;
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dst->ivec = src->ivec;
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}
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static inline bool cas_io_iter_is_next(struct bio_vec_iter *iter)
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{
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return iter->idx < iter->vec_size ? true : false;
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/* TODO UNITTEST */
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}
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static inline uint32_t cas_io_iter_size_done(struct bio_vec_iter *iter)
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{
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return iter->idx;
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/* TODO UNITTEST */
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}
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static inline uint32_t cas_io_iter_size_left(struct bio_vec_iter *iter)
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{
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if (iter->idx < iter->vec_size)
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return min(iter->vec_size - iter->idx, CAS_BIO_MAX_VECS);
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return 0;
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/* TODO UNITTEST */
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}
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static inline uint32_t cas_io_iter_current_offset(struct bio_vec_iter *iter)
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{
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return iter->idx < iter->vec_size ? iter->offset : 0;
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/* TODO UNITTEST */
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}
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static inline uint32_t cas_io_iter_current_length(struct bio_vec_iter *iter)
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{
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return iter->idx < iter->vec_size ? iter->len : 0;
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/* TODO UNITTEST */
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}
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static inline struct page *cas_io_iter_current_page(struct bio_vec_iter *iter)
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{
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return iter->idx < iter->vec_size ? iter->ivec->bv_page : NULL;
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/* TODO UNITTEST */
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}
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uint32_t cas_io_iter_cpy(struct bio_vec_iter *dst, struct bio_vec_iter *src,
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uint32_t bytes);
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uint32_t cas_io_iter_cpy_from_data(struct bio_vec_iter *dst,
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const void *src, uint32_t bytes);
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uint32_t cas_io_iter_cpy_to_data(void *dst, struct bio_vec_iter *src,
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uint32_t bytes);
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uint32_t cas_io_iter_move(struct bio_vec_iter *iter,
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uint32_t bytes);
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uint32_t cas_io_iter_zero(struct bio_vec_iter *iter, uint32_t bytes);
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#endif /* __VOL_BLK_UTILS_H__ */
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