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| author | Warner Losh <imp@FreeBSD.org> | 2018-03-14 17:53:37 +0000 |
|---|---|---|
| committer | Warner Losh <imp@FreeBSD.org> | 2018-03-14 17:53:37 +0000 |
| commit | d38677d23c2545b2d98c93ef13a6c9af9c2d28cc (patch) | |
| tree | 0e37c6b5f51155c6db22d299fd67a46218e4edd7 /sys/cam/nvme/nvme_da.c | |
| parent | 2a559cb8c8177e89e7bf74a54c8a34fbcf7b7139 (diff) | |
| download | src-d38677d23c2545b2d98c93ef13a6c9af9c2d28cc.tar.gz src-d38677d23c2545b2d98c93ef13a6c9af9c2d28cc.zip | |
Create a sysctl kern.cam.{,a,n}da.X.invalidate
kern.cam.{,a,n}da.X.invalidate=1 forces *daX to detach by calling
cam_periph_invalidate on the underlying periph. This is for testing
purposes only. Include only with options CAM_TEST_FAILURE and rename
the former [AN]DA_TEST_FAILURE, and fix nda to compile with it set.
We're using it at work to harden geom and the buffer cache to be
resilient in the face of drive failure. Today, it far too often
results in a panic. While much work was done on SIM initiated removal
for the USB thumnb drive removal work, little has been done for periph
initiated removal. This simulates what *daerror() does for some errors
nicely: we get the same panics with it that we do with failing drives.
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D14581
Notes
Notes:
svn path=/head/; revision=330935
Diffstat (limited to 'sys/cam/nvme/nvme_da.c')
| -rw-r--r-- | sys/cam/nvme/nvme_da.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/sys/cam/nvme/nvme_da.c b/sys/cam/nvme/nvme_da.c index a041e9fe948a..d83f505f5fb1 100644 --- a/sys/cam/nvme/nvme_da.c +++ b/sys/cam/nvme/nvme_da.c @@ -112,6 +112,12 @@ struct nda_softc { struct task sysctl_task; struct sysctl_ctx_list sysctl_ctx; struct sysctl_oid *sysctl_tree; +#ifdef CAM_TEST_FAILURE + int force_read_error; + int force_write_error; + int periodic_read_error; + int periodic_read_count; +#endif #ifdef CAM_IO_STATS struct sysctl_ctx_list sysctl_stats_ctx; struct sysctl_oid *sysctl_stats_tree; @@ -666,6 +672,13 @@ ndasysctlinit(void *context, int pending) "Device pack invalidations."); #endif +#ifdef CAM_TEST_FAILURE + SYSCTL_ADD_PROC(&softc->sysctl_ctx, SYSCTL_CHILDREN(softc->sysctl_tree), + OID_AUTO, "invalidate", CTLTYPE_U64 | CTLFLAG_RW | CTLFLAG_MPSAFE, + periph, 0, cam_periph_invalidate_sysctl, "I", + "Write 1 to invalidate the drive immediately"); +#endif + cam_iosched_sysctl_init(softc->cam_iosched, &softc->sysctl_ctx, softc->sysctl_tree); @@ -876,7 +889,7 @@ ndastart(struct cam_periph *periph, union ccb *start_ccb) /* FALLTHROUGH */ case BIO_READ: { -#ifdef NDA_TEST_FAILURE +#ifdef CAM_TEST_FAILURE int fail = 0; /* |