函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:block\blk-core.c Create Date:2022-07-27 18:35:26
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：submit_bio - submit a bio to the block device layer for I/O*@bio: The &struct bio which describes the I/O* submit_bio() is very similar in purpose to generic_make_request(), and* uses that function to do most of the work. Both are fairly rough

函数原型：blk_qc_t submit_bio(struct bio *bio)

返回类型：blk_qc_t

参数：

类型参数名称
struct bio *bio
1148  bool workingset_read = false
1152  如果blkcg_punt_bio_submit(bio)则返回:BLK_QC_T_NONE
1159  如果Check whether this bio carries any data or not. A NULL bio is allowed.则
1162  如果此条件成立可能性小(为编译器优化)(bio_op(bio) == REQ_OP_WRITE_SAME)则count等于queue_logical_block_size(queue)右移9位
1164  否则count等于bio_sectors(bio)
1167  如果op_is_write(bio_op(bio))则
1168  count_vm_events(PGPGOUT, count)
1169  否则
1170  如果bio_flagged(bio, BIO_WORKINGSET)则workingset_read = true
1172  task_io_account_read( residual I/O count )
1173  count_vm_events(PGPGIN, count)
1176  如果此条件成立可能性小(为编译器优化)(Flag that makes the machine dump writes/reads and block dirtyings.)则
1178  printk - print a kernel message*@fmt: format string* This is printk(). It can be called from any context. We want it to work.* We try to grab the console_lock. If we succeed, it's easy - we log the* output and call the console drivers
1192  如果workingset_read则psi_memstall_enter( & pflags)
1195  ret等于generic_make_request - hand a buffer to its device driver for I/O*@bio: The bio describing the location in memory and on the device.* generic_make_request() is used to make I/O requests of block* devices
1197  如果workingset_read则psi_memstall_leave( & pflags)
1200  返回:ret
调用者
名称描述
swap_readpage
blk_next_bio
blkg_async_bio_workfn
__blkdev_direct_IO_simple
__blkdev_direct_IO
dio_bio_submitIn the AIO read case we speculatively dirty the pages before starting IO.* During IO completion, any of these pages which happen to have been written* back will be redirtied by bio_check_pages_dirty().
mpage_bio_submit
iomap_readpage_actor
iomap_readpage
iomap_readpages
iomap_submit_ioendSubmit the final bio for an ioend.* If @error is non-zero, it means that we have a situation where some part of* the submission process has failed after we have marked paged for writeback* and unlocked them
iomap_chain_bioAllocate a new bio, and chain the old bio to the new one.* Note that we have to do perform the chaining in this unintuitive order* so that the bi_private linkage is set up in the right direction for the* traversal in iomap_finish_ioend().
iomap_dio_submit_bio
hib_submit_io