The Linux Manuals (man pages) document is an important part of Linux documents. Linux Manuals are organized as several sections. Each section has a group of commands for a specific area in Linux usage, administration or development.
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
bdgrab – – Grab a reference to an already referenced block device Synopsis struct block_device *bdgrab(struct block_device *bdev); Arguments bdev Block device to grab a reference to. Copyright
bdget_disk – do bdget by gendisk and partition number Synopsis struct block_device *bdget_disk(struct gendisk *disk, int partno); Arguments disk gendisk of interest partno partition number Description Find partition partno from disk, do bdget on it. Context Don’t care. Return Resulting block_device on success, NULL on failure. Copyright
bdev_write_page – Start writing a page to a block device Synopsis int bdev_write_page(struct block_device *bdev, sector_t sector, struct page *page, struct writeback_control *wbc); Arguments bdev The device to write the page to sector The offset on the device to write the page to (need not be aligned) page The page to write wbc The writeback_control…
bdev_stack_limits – adjust queue limits for stacked drivers Synopsis int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, sector_t start); Arguments t the stacking driver limits (top device) bdev the component block_device (bottom) start first data sector within component device Description Merges queue limits for a top device and a block_device. Returns 0 if alignment didn’t change….
bdev_read_page – Start reading a page from a block device Synopsis int bdev_read_page(struct block_device *bdev, sector_t sector, struct page *page); Arguments bdev The device to read the page from sector The offset on the device to read the page to (need not be aligned) page The page to read Description On entry, the page should…
bdev_direct_access – Get the address for directly-accessibly memory Synopsis long bdev_direct_access(struct block_device *bdev, struct blk_dax_ctl *dax); Arguments bdev The device containing the memory dax control and output parameters for ->direct_access Description If a block device is made up of directly addressable memory, this function will tell the caller the PFN and the address of the…