bioset_create – Create a bio_set Synopsis struct bio_set *bioset_create(unsigned int pool_size, unsigned int front_pad); Arguments pool_size Number of bio and bio_vecs to cache in the mempool front_pad Number of bytes to allocate in front of the returned bio Description Set up a bio_set to be used with bio_alloc_bioset. Allows the caller to ask for a…
bio_trim – trim a bio Synopsis void bio_trim(struct bio *bio, int offset, int size); Arguments bio bio to trim offset number of sectors to trim from the front of bio size size we want to trim bio to, in sectors Copyright
bio_split – split a bio Synopsis struct bio *bio_split(struct bio *bio, int sectors, gfp_t gfp, struct bio_set *bs); Arguments bio bio to split sectors number of sectors to split from the front of bio gfp gfp mask bs bio set to allocate from Description Allocates and returns a new bio which represents sectors from the…
bio_reset – reinitialize a bio Synopsis void bio_reset(struct bio *bio); Arguments bio bio to reset Description After calling bio_reset, bio will be in the same state as a freshly allocated bio returned bio bio_alloc_bioset – the only fields that are preserved are the ones that are initialized by bio_alloc_bioset. See comment in struct bio. Copyright
bio_put – release a reference to a bio Synopsis void bio_put(struct bio *bio); Arguments bio bio to release reference to Description Put a reference to a struct bio, either one you have gotten with bio_alloc, bio_get or bio_clone. The last put of a bio will free it. Copyright
bio_map_kern – map kernel address into bio Synopsis struct bio *bio_map_kern(struct request_queue *q, void *data, unsigned int len, gfp_t gfp_mask); Arguments q the struct request_queue for the bio data pointer to buffer to map len length in bytes gfp_mask allocation flags for bio allocation Description Map the kernel address into a bio suitable for io…
bio_endio – end I/O on a bio Synopsis void bio_endio(struct bio *bio); Arguments bio bio Description bio_endio will end I/O on the whole bio. bio_endio is the preferred way to end I/O on a bio. No one should call bi_end_io directly on a bio unless they own it and thus know that it has an…
bio_copy_data – copy contents of data buffers from one chain of bios to another Synopsis void bio_copy_data(struct bio *dst, struct bio *src); Arguments dst destination bio list src source bio list Description If src and dst are single bios, bi_next must be NULL – otherwise, treats src and dst as linked lists of bios. Stops…
bio_clone_fast – clone a bio that shares the original bio’s biovec Synopsis struct bio *bio_clone_fast(struct bio *bio, gfp_t gfp_mask, struct bio_set *bs); Arguments bio bio to clone gfp_mask allocation priority bs bio_set to allocate from Description Like __bio_clone_fast, only also allocates the returned bio Copyright
bio_clone_bioset – clone a bio Synopsis struct bio *bio_clone_bioset(struct bio *bio_src, gfp_t gfp_mask, struct bio_set *bs); Arguments bio_src bio to clone gfp_mask allocation priority bs bio_set to allocate from Description Clone bio. Caller will own the returned bio, but not the actual data it points to. Reference count of returned bio will be one. Copyright
bio_chain – chain bio completions Synopsis void bio_chain(struct bio *bio, struct bio *parent); Arguments bio the target bio parent the bio‘s parent bio Description The caller won’t have a bi_end_io called when bio completes – instead, parent‘s bi_end_io won’t be called until both parent and bio have completed; the chained bio will also be freed…
bio_associate_current – associate a bio with current Synopsis int bio_associate_current(struct bio *bio); Arguments bio target bio Description Associate bio with current if it hasn’t been associated yet. Block layer will treat bio as if it were issued by current no matter which task actually issues it. This function takes an extra reference of task‘s io_context…
bio_associate_blkcg – associate a bio with the specified blkcg Synopsis int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); Arguments bio target bio blkcg_css css of the blkcg to associate Description Associate bio with the blkcg specified by blkcg_css. Block layer will treat bio as if it were issued by a task which belongs to the blkcg….
bio_alloc_pages – allocates a single page for each bvec in a bio Synopsis int bio_alloc_pages(struct bio *bio, gfp_t gfp_mask); Arguments bio bio to allocate pages for gfp_mask flags for allocation Description Allocates pages up to bio->bi_vcnt. Returns 0 on success, -ENOMEM on failure. On failure, any allocated pages are freed. Copyright
bio_alloc_bioset – allocate a bio for I/O Synopsis struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs); Arguments gfp_mask the GFP_ mask given to the slab allocator nr_iovecs number of iovecs to pre-allocate bs the bio_set to allocate from. Description If bs is NULL, uses kmalloc to allocate the bio; else the allocation is backed…
bio_advance – increment/complete a bio by some number of bytes Synopsis void bio_advance(struct bio *bio, unsigned bytes); Arguments bio bio to advance bytes number of bytes to complete Description This updates bi_sector, bi_size and bi_idx; if the number of bytes to complete doesn’t align with a bvec boundary, then bv_len and bv_offset will be updated…
bio_add_pc_page – attempt to add page to bio Synopsis int bio_add_pc_page(struct request_queue *q, struct bio *bio, struct page *page, unsigned int len, unsigned int offset); Arguments q the target queue bio destination bio page page to add len vec entry length offset vec entry offset Description Attempt to add a page to the bio_vec maplist….
bio_add_page – attempt to add page to bio Synopsis int bio_add_page(struct bio *bio, struct page *page, unsigned int len, unsigned int offset); Arguments bio destination bio page page to add len vec entry length offset vec entry offset Description Attempt to add a page to the bio_vec maplist. This will only fail if either bio->bi_vcnt…
bh_uptodate_or_lock – Test whether the buffer is uptodate Synopsis int bh_uptodate_or_lock(struct buffer_head *bh); Arguments bh struct buffer_head Description Return true if the buffer is up-to-date and false, with the buffer locked, if not. Copyright
bh_submit_read – Submit a locked buffer for reading Synopsis int bh_submit_read(struct buffer_head *bh); Arguments bh struct buffer_head Description Returns zero on success and -EIO on error. Copyright