linux-kernel - [PATCH 4/4] lightnvm: Precalculate max/min sectors per req.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed,  4 May 2016 17:31:32 +0200
From:	"Javier González" <jg@...htnvm.io>
To:	mb@...htnvm.io
Cc:	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
	Javier González <javier@...xlabs.com>
Subject: [PATCH 4/4] lightnvm: Precalculate max/min sectors per req.

Add two precalculated values to nvm_rq: (i) maximum number of sectors
per general request; and (ii) minimum number of sectors per write
request.

Signed-off-by: Javier González <javier@...xlabs.com>
---
 drivers/lightnvm/core.c  | 3 +++
 include/linux/lightnvm.h | 4 +++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 4cd9803..85682d91 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -573,6 +573,9 @@ static int nvm_core_init(struct nvm_dev *dev)
 
 	dev->plane_mode = NVM_PLANE_SINGLE;
 	dev->max_rq_size = dev->ops->max_phys_sect * dev->sec_size;
+	dev->max_sec_rq = dev->ops->max_phys_sect;
+	/* assume max_phys_sect % dev->min_write_pgs == 0 */
+	dev->min_sec_w_rq = dev->sec_per_pl * (dev->sec_size / PAGE_SIZE);
 
 	if (grp->mpos & 0x020202)
 		dev->plane_mode = NVM_PLANE_DOUBLE;
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index 67e72f5..c2dfd0c 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -351,7 +351,9 @@ struct nvm_dev {
 	/* Calculated/Cached values. These do not reflect the actual usable
 	 * blocks at run-time.
 	 */
-	int max_rq_size;
+	int max_rq_size; /* maximum size of a single request */
+	int max_sec_rq; /* maximum amount of sectors that fit in one req. */
+	int min_sec_w_rq; /* minimum amount of sectors required on write req. */
 	int plane_mode; /* drive device in single, double or quad mode */
 
 	int sec_per_pl; /* all sectors across planes */
-- 
2.5.0