diff options
| author | Howard McLauchlan <hmclauchlan@fb.com> | 2018-02-06 14:05:39 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-02-06 15:09:51 -0700 |
| commit | 30abb3a67f4b2aa160feeb3c0b771f730cbcca67 (patch) | |
| tree | 14c7784a2e69497b38cbb35b3554a4482261fab9 /block | |
| parent | 5235553d821433e1f4fa720fd025d2c4b7ee9994 (diff) | |
| download | linux-30abb3a67f4b2aa160feeb3c0b771f730cbcca67.tar.gz | |
block: Add should_fail_bio() for bpf error injection
The classic error injection mechanism, should_fail_request() does not support use cases where more information is required (from the entire struct bio, for example). To that end, this patch introduces should_fail_bio(), which calls should_fail_request() under the hood but provides a convenient place for kprobes to hook into if they require the entire struct bio. This patch also replaces some existing calls to should_fail_request() with should_fail_bio() with no degradation in performance. Signed-off-by: Howard McLauchlan <hmclauchlan@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-core.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index d0d104268f1a..2d1a7bbe0634 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -34,6 +34,7 @@ #include <linux/pm_runtime.h> #include <linux/blk-cgroup.h> #include <linux/debugfs.h> +#include <linux/bpf.h> #define CREATE_TRACE_POINTS #include <trace/events/block.h> @@ -2083,6 +2084,14 @@ static inline bool bio_check_ro(struct bio *bio, struct hd_struct *part) return false; } +static noinline int should_fail_bio(struct bio *bio) +{ + if (should_fail_request(&bio->bi_disk->part0, bio->bi_iter.bi_size)) + return -EIO; + return 0; +} +ALLOW_ERROR_INJECTION(should_fail_bio, ERRNO); + /* * Remap block n of partition p to block n+start(p) of the disk. */ @@ -2174,7 +2183,7 @@ generic_make_request_checks(struct bio *bio) if ((bio->bi_opf & REQ_NOWAIT) && !queue_is_rq_based(q)) goto not_supported; - if (should_fail_request(&bio->bi_disk->part0, bio->bi_iter.bi_size)) + if (should_fail_bio(bio)) goto end_io; if (!bio->bi_partno) { |