linux-kernel - [PATCH] md: Replace role magic numbers with defined constants

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Date:   Thu, 21 Apr 2022 13:45:58 -0600
From:   David Sloan <david.sloan@...eticom.com>
To:     Song Liu <song@...nel.org>, linux-raid@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Logan Gunthorpe <logang@...tatee.com>,
        David Sloan <david.sloan@...eticom.com>
Subject: [PATCH] md: Replace role magic numbers with defined constants

There are several instances where magic numbers are used in md.c instead
of the defined constants in md_p.h. This patch set improves code
readability by replacing all occurrences of 0xffff, 0xfffe, and 0xfffd when
relating to md roles with their equivalent defined constant.

Signed-off-by: David Sloan <david.sloan@...eticom.com>
Reviewed-by: Logan Gunthorpe <logang@...tatee.com>
---
 drivers/md/md.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 309b3af906ad..b34b72fc5887 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2645,11 +2645,12 @@ static bool does_sb_need_changing(struct mddev *mddev)
 	rdev_for_each(rdev, mddev) {
 		role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
 		/* Device activated? */
-		if (role == 0xffff && rdev->raid_disk >=0 &&
+		if (role == MD_DISK_ROLE_SPARE && rdev->raid_disk >= 0 &&
 		    !test_bit(Faulty, &rdev->flags))
 			return true;
 		/* Device turned faulty? */
-		if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd))
+		if (test_bit(Faulty, &rdev->flags) &&
+		    role < MD_DISK_ROLE_JOURNAL)
 			return true;
 	}
 
@@ -9671,7 +9672,7 @@ static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
 		role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]);
 
 		if (test_bit(Candidate, &rdev2->flags)) {
-			if (role == 0xfffe) {
+			if (role == MD_DISK_ROLE_FAULTY) {
 				pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b));
 				md_kick_rdev_from_array(rdev2);
 				continue;
@@ -9684,7 +9685,8 @@ static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
 			/*
 			 * got activated except reshape is happening.
 			 */
-			if (rdev2->raid_disk == -1 && role != 0xffff &&
+			if (rdev2->raid_disk == -1 &&
+			    role != MD_DISK_ROLE_SPARE &&
 			    !(le32_to_cpu(sb->feature_map) &
 			      MD_FEATURE_RESHAPE_ACTIVE)) {
 				rdev2->saved_raid_disk = role;
@@ -9701,7 +9703,8 @@ static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev)
 			 * as faulty. The recovery is performed by the
 			 * one who initiated the error.
 			 */
-			if ((role == 0xfffe) || (role == 0xfffd)) {
+			if (role == MD_DISK_ROLE_FAULTY ||
+			    role == MD_DISK_ROLE_JOURNAL) {
 				md_error(mddev, rdev2);
 				clear_bit(Blocked, &rdev2->flags);
 			}

base-commit: b2d229d4ddb17db541098b83524d901257e93845
-- 
2.17.1