From: Michael Jeanson Date: Wed, 20 Sep 2017 16:12:39 +0000 (-0400) Subject: Fix: update block instrumentation for kernel 4.14 X-Git-Tag: v2.11.0-rc1~107 X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=49447902967115fe5a07ee7a1df3d17fbf4b1ab8;p=lttng-modules.git Fix: update block instrumentation for kernel 4.14 See upstream commit: commit 74d46992e0d9dee7f1f376de0d56d31614c8a17a Author: Christoph Hellwig Date: Wed Aug 23 19:10:32 2017 +0200 block: replace bi_bdev with a gendisk pointer and partitions index This way we don't need a block_device structure to submit I/O. The block_device has different life time rules from the gendisk and request_queue and is usually only available when the block device node is open. Other callers need to explicitly create one (e.g. the lightnvm passthrough code, or the new nvme multipathing code). For the actual I/O path all that we need is the gendisk, which exists once per block device. But given that the block layer also does partition remapping we additionally need a partition index, which is used for said remapping in generic_make_request. Note that all the block drivers generally want request_queue or sometimes the gendisk, so this removes a layer of indirection all over the stack. Signed-off-by: Michael Jeanson Signed-off-by: Mathieu Desnoyers --- diff --git a/instrumentation/events/lttng-module/block.h b/instrumentation/events/lttng-module/block.h index c43d7471..80ea25ca 100644 --- a/instrumentation/events/lttng-module/block.h +++ b/instrumentation/events/lttng-module/block.h @@ -33,6 +33,13 @@ enum { #endif /* _TRACE_BLOCK_DEF_ */ + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,14,0)) +#define lttng_bio_dev(bio) bio_dev(bio) +#else +#define lttng_bio_dev(bio) ((bio)->bi_bdev ? (bio)->bi_bdev->bd_dev : 0) +#endif + #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,8,0)) #define lttng_req_op(rq) req_op(rq) @@ -611,7 +618,7 @@ LTTNG_TRACEPOINT_EVENT(block_bio_bounce, TP_ARGS(q, bio), TP_FIELDS( - ctf_integer(dev_t, dev, bio->bi_bdev ? bio->bi_bdev->bd_dev : 0) + ctf_integer(dev_t, dev, lttng_bio_dev(bio)) #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,14,0)) ctf_integer(sector_t, sector, bio->bi_iter.bi_sector) ctf_integer(unsigned int, nr_sector, bio_sectors(bio)) @@ -652,7 +659,7 @@ LTTNG_TRACEPOINT_EVENT(block_bio_complete, #endif TP_FIELDS( - ctf_integer(dev_t, dev, bio->bi_bdev->bd_dev) + ctf_integer(dev_t, dev, lttng_bio_dev(bio)) #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,14,0)) ctf_integer(sector_t, sector, bio->bi_iter.bi_sector) ctf_integer(unsigned int, nr_sector, bio_sectors(bio)) @@ -682,7 +689,7 @@ LTTNG_TRACEPOINT_EVENT_CLASS(block_bio_merge, TP_ARGS(q, rq, bio), TP_FIELDS( - ctf_integer(dev_t, dev, bio->bi_bdev->bd_dev) + ctf_integer(dev_t, dev, lttng_bio_dev(bio)) #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,14,0)) ctf_integer(sector_t, sector, bio->bi_iter.bi_sector) ctf_integer(unsigned int, nr_sector, bio_sectors(bio)) @@ -744,7 +751,7 @@ LTTNG_TRACEPOINT_EVENT(block_bio_queue, TP_ARGS(q, bio), TP_FIELDS( - ctf_integer(dev_t, dev, bio->bi_bdev->bd_dev) + ctf_integer(dev_t, dev, lttng_bio_dev(bio)) #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,14,0)) ctf_integer(sector_t, sector, bio->bi_iter.bi_sector) ctf_integer(unsigned int, nr_sector, bio_sectors(bio)) @@ -769,7 +776,7 @@ LTTNG_TRACEPOINT_EVENT_CLASS(block_bio, TP_ARGS(q, bio), TP_FIELDS( - ctf_integer(dev_t, dev, bio->bi_bdev ? bio->bi_bdev->bd_dev : 0) + ctf_integer(dev_t, dev, lttng_bio_dev(bio)) ctf_integer(sector_t, sector, bio->bi_sector) ctf_integer(unsigned int, nr_sector, bio->bi_size >> 9) blk_rwbs_ctf_integer(unsigned int, rwbs, @@ -831,7 +838,7 @@ LTTNG_TRACEPOINT_EVENT_CLASS(block_get_rq, TP_ARGS(q, bio, rw), TP_FIELDS( - ctf_integer(dev_t, dev, bio ? bio->bi_bdev->bd_dev : 0) + ctf_integer(dev_t, dev, lttng_bio_dev(bio)) #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,14,0)) ctf_integer(sector_t, sector, bio ? bio->bi_iter.bi_sector : 0) ctf_integer(unsigned int, nr_sector, @@ -992,7 +999,7 @@ LTTNG_TRACEPOINT_EVENT(block_split, TP_ARGS(q, bio, new_sector), TP_FIELDS( - ctf_integer(dev_t, dev, bio->bi_bdev->bd_dev) + ctf_integer(dev_t, dev, lttng_bio_dev(bio)) #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,14,0)) ctf_integer(sector_t, sector, bio->bi_iter.bi_sector) blk_rwbs_ctf_integer(unsigned int, rwbs, @@ -1031,7 +1038,7 @@ LTTNG_TRACEPOINT_EVENT(block_remap, TP_ARGS(q, bio, dev, from), TP_FIELDS( - ctf_integer(dev_t, dev, bio->bi_bdev->bd_dev) + ctf_integer(dev_t, dev, lttng_bio_dev(bio)) #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,14,0)) ctf_integer(sector_t, sector, bio->bi_iter.bi_sector) ctf_integer(unsigned int, nr_sector, bio_sectors(bio))