diff options
Diffstat (limited to 'sys/dev/nvd/nvd.c')
| -rw-r--r-- | sys/dev/nvd/nvd.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/sys/dev/nvd/nvd.c b/sys/dev/nvd/nvd.c index 24ee075..e062f57 100644 --- a/sys/dev/nvd/nvd.c +++ b/sys/dev/nvd/nvd.c @@ -1,5 +1,5 @@ /*- - * Copyright (C) 2012-2013 Intel Corporation + * Copyright (C) 2012-2016 Intel Corporation * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -32,6 +32,7 @@ __FBSDID("$FreeBSD$"); #include <sys/kernel.h> #include <sys/malloc.h> #include <sys/module.h> +#include <sys/sysctl.h> #include <sys/systm.h> #include <sys/taskqueue.h> @@ -88,6 +89,19 @@ struct nvd_controller { static TAILQ_HEAD(, nvd_controller) ctrlr_head; static TAILQ_HEAD(disk_list, nvd_disk) disk_head; +static SYSCTL_NODE(_hw, OID_AUTO, nvd, CTLFLAG_RD, 0, "nvd driver parameters"); +/* + * The NVMe specification does not define a maximum or optimal delete size, so + * technically max delete size is min(full size of the namespace, 2^32 - 1 + * LBAs). A single delete for a multi-TB NVMe namespace though may take much + * longer to complete than the nvme(4) I/O timeout period. So choose a sensible + * default here that is still suitably large to minimize the number of overall + * delete operations. + */ +static uint64_t nvd_delete_max = (1024 * 1024 * 1024); /* 1GB */ +SYSCTL_UQUAD(_hw_nvd, OID_AUTO, delete_max, CTLFLAG_RDTUN, &nvd_delete_max, 0, + "nvd maximum BIO_DELETE size in bytes"); + static int nvd_modevent(module_t mod, int type, void *arg) { int error = 0; @@ -295,6 +309,8 @@ nvd_new_disk(struct nvme_namespace *ns, void *ctrlr_arg) disk->d_sectorsize = nvme_ns_get_sector_size(ns); disk->d_mediasize = (off_t)nvme_ns_get_size(ns); disk->d_delmaxsize = (off_t)nvme_ns_get_size(ns); + if (disk->d_delmaxsize > nvd_delete_max) + disk->d_delmaxsize = nvd_delete_max; disk->d_stripesize = nvme_ns_get_optimal_sector_size(ns); if (TAILQ_EMPTY(&disk_head)) |
