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probe blk_mq_start_request 

Signed-off-by: Wenchao Hao <haowenchao@huawei.com>
This commit is contained in:
Wenchao Hao 2023-04-20 15:43:51 +08:00
parent 1fe8fcd630
commit 0af6ff3b01
1 changed files with 15 additions and 3 deletions
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18
blk_kprobe.c
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@ -4,6 +4,7 @@
#include <linux/bio.h> #include <linux/bio.h>
#include <linux/bvec.h> #include <linux/bvec.h>
#include <linux/blkdev.h> #include <linux/blkdev.h>
#include <linux/blk-mq.h>
static int submit_bio_pre(struct kprobe *p, struct pt_regs *regs) { static int submit_bio_pre(struct kprobe *p, struct pt_regs *regs) {
struct bio *bio = (struct bio *)regs->di; struct bio *bio = (struct bio *)regs->di;
@ -16,9 +17,6 @@ static int submit_bio_pre(struct kprobe *p, struct pt_regs *regs) {
iter.bi_idx, iter.bi_sector, iter.bi_size, iter.bi_bvec_done, (unsigned long)bvec.bv_page, bvec.bv_len, bvec.bv_offset); iter.bi_idx, iter.bi_sector, iter.bi_size, iter.bi_bvec_done, (unsigned long)bvec.bv_page, bvec.bv_len, bvec.bv_offset);
} }
if (bio->bi_vcnt != 1)
dump_stack();
return 0; return 0;
} }
@ -27,8 +25,22 @@ static struct kprobe submit_bio_kp = {
.pre_handler = submit_bio_pre, .pre_handler = submit_bio_pre,
}; };
static int blk_mq_start_request_pre(struct kprobe *p, struct pt_regs *regs) {
struct request *rq = (struct request *)regs->di;
printk(KERN_INFO "tag is %d, internal_tag is %d, sector is %lld, bytes is %d, nr_phys_segments is %d\n", rq->tag, rq->internal_tag, blk_rq_pos(rq), blk_rq_bytes(rq), rq->nr_phys_segments);
return 0;
}
static struct kprobe blk_mq_start_request_kp = {
.symbol_name = "blk_mq_start_request",
.pre_handler = blk_mq_start_request_pre,
};
static struct kprobe *kprobes[] = { static struct kprobe *kprobes[] = {
&submit_bio_kp, &submit_bio_kp,
&blk_mq_start_request_kp,
}; };
static int __init kprobe_init(void) { static int __init kprobe_init(void) {