mdadm/SOURCES/0021-mdadm-Add-functions-for-spare-criteria-verification.patch

From 0c0f09cb035b6a27a1d11c54836742a9945a5014 Mon Sep 17 00:00:00 2001
From: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
Date: Thu, 29 Feb 2024 12:52:05 +0100
Subject: [PATCH 21/41] mdadm: Add functions for spare criteria verification

It is done similar way in few places. As a result, two almost identical
functions (dev_size_from_id() and dev_sector_size_from_id()) are
removed. Now, it uses same file descriptor to send two ioctls.

Two extern functions are added, in next patches
disk_fd_matches_criteria() is used.

Next optimization is inline zeroing struct spare_criteria. With that,
we don't need to reset values in get_spare_criteria_imsm().

Dedicated boolean field for checking if criteria are filled is added.
We don't need to execute the code if it is not set.

Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
---
 Incremental.c |   2 +-
 Monitor.c     |  14 +------
 mdadm.h       |   6 ++-
 super-intel.c |   4 +-
 util.c        | 112 ++++++++++++++++++++++++++------------------------
 5 files changed, 67 insertions(+), 71 deletions(-)

diff --git a/Incremental.c b/Incremental.c
index 30c07c03..2b5a5859 100644
--- a/Incremental.c
+++ b/Incremental.c
@@ -874,7 +874,7 @@ static int array_try_spare(char *devname, int *dfdp, struct dev_policy *pol,
 		struct domainlist *dl = NULL;
 		struct mdinfo *sra;
 		unsigned long long devsize, freesize = 0;
-		struct spare_criteria sc = {0, 0};
+		struct spare_criteria sc = {0};
 
 		if (is_subarray(mp->metadata))
 			continue;
diff --git a/Monitor.c b/Monitor.c
index 9be2b528..1ece8712 100644
--- a/Monitor.c
+++ b/Monitor.c
@@ -1070,22 +1070,12 @@ static dev_t choose_spare(struct state *from, struct state *to,
 	for (d = from->raid; !dev && d < MAX_DISKS; d++) {
 		if (from->devid[d] > 0 && from->devstate[d] == 0) {
 			struct dev_policy *pol;
-			unsigned long long dev_size;
-			unsigned int dev_sector_size;
 
 			if (to->metadata->ss->external &&
 			    test_partition_from_id(from->devid[d]))
 				continue;
 
-			if (sc->min_size &&
-			    dev_size_from_id(from->devid[d], &dev_size) &&
-			    dev_size < sc->min_size)
-				continue;
-
-			if (sc->sector_size &&
-			    dev_sector_size_from_id(from->devid[d],
-						    &dev_sector_size) &&
-			    sc->sector_size != dev_sector_size)
+			if (devid_matches_criteria(from->devid[d], sc) == false)
 				continue;
 
 			pol = devid_policy(from->devid[d]);
@@ -1170,12 +1160,12 @@ static void try_spare_migration(struct state *statelist)
 {
 	struct state *from;
 	struct state *st;
-	struct spare_criteria sc;
 
 	link_containers_with_subarrays(statelist);
 	for (st = statelist; st; st = st->next)
 		if (st->active < st->raid && st->spare == 0 && !st->err) {
 			struct domainlist *domlist = NULL;
+			struct spare_criteria sc = {0};
 			int d;
 			struct state *to = st;
 
diff --git a/mdadm.h b/mdadm.h
index 75c887e4..e8abd730 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -430,6 +430,7 @@ struct createinfo {
 };
 
 struct spare_criteria {
+	bool criteria_set;
 	unsigned long long min_size;
 	unsigned int sector_size;
 };
@@ -1368,8 +1369,6 @@ extern struct supertype *dup_super(struct supertype *st);
 extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
 extern int get_dev_sector_size(int fd, char *dname, unsigned int *sectsizep);
 extern int must_be_container(int fd);
-extern int dev_size_from_id(dev_t id, unsigned long long *size);
-extern int dev_sector_size_from_id(dev_t id, unsigned int *size);
 void wait_for(char *dev, int fd);
 
 /*
@@ -1708,6 +1707,9 @@ extern int assemble_container_content(struct supertype *st, int mdfd,
 #define	INCR_UNSAFE	2
 #define	INCR_ALREADY	4
 #define	INCR_YES	8
+
+extern bool devid_matches_criteria(dev_t devid, struct spare_criteria *sc);
+extern bool disk_fd_matches_criteria(int disk_fd, struct spare_criteria *sc);
 extern struct mdinfo *container_choose_spares(struct supertype *st,
 					      struct spare_criteria *criteria,
 					      struct domainlist *domlist,
diff --git a/super-intel.c b/super-intel.c
index 4babec9f..39ec4754 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -1748,9 +1748,6 @@ int get_spare_criteria_imsm(struct supertype *st, struct spare_criteria *c)
 	int i;
 	unsigned long long size = 0;
 
-	c->min_size = 0;
-	c->sector_size = 0;
-
 	if (!super)
 		return -EINVAL;
 	/* find first active disk in array */
@@ -1774,6 +1771,7 @@ int get_spare_criteria_imsm(struct supertype *st, struct spare_criteria *c)
 
 	c->min_size = size * 512;
 	c->sector_size = super->sector_size;
+	c->criteria_set = true;
 
 	return 0;
 }
diff --git a/util.c b/util.c
index b1454473..041e78cf 100644
--- a/util.c
+++ b/util.c
@@ -1266,40 +1266,6 @@ struct supertype *super_by_fd(int fd, char **subarrayp)
 	return st;
 }
 
-int dev_size_from_id(dev_t id, unsigned long long *size)
-{
-	char buf[20];
-	int fd;
-
-	sprintf(buf, "%d:%d", major(id), minor(id));
-	fd = dev_open(buf, O_RDONLY);
-	if (fd < 0)
-		return 0;
-	if (get_dev_size(fd, NULL, size)) {
-		close(fd);
-		return 1;
-	}
-	close(fd);
-	return 0;
-}
-
-int dev_sector_size_from_id(dev_t id, unsigned int *size)
-{
-	char buf[20];
-	int fd;
-
-	sprintf(buf, "%d:%d", major(id), minor(id));
-	fd = dev_open(buf, O_RDONLY);
-	if (fd < 0)
-		return 0;
-	if (get_dev_sector_size(fd, NULL, size)) {
-		close(fd);
-		return 1;
-	}
-	close(fd);
-	return 0;
-}
-
 struct supertype *dup_super(struct supertype *orig)
 {
 	struct supertype *st;
@@ -2088,6 +2054,60 @@ void append_metadata_update(struct supertype *st, void *buf, int len)
 unsigned int __invalid_size_argument_for_IOC = 0;
 #endif
 
+/**
+ * disk_fd_matches_criteria() - check if device matches spare criteria.
+ * @disk_fd: file descriptor of the disk.
+ * @sc: criteria to test.
+ *
+ * Return: true if disk matches criteria, false otherwise.
+ */
+bool disk_fd_matches_criteria(int disk_fd, struct spare_criteria *sc)
+{
+	unsigned int dev_sector_size = 0;
+	unsigned long long dev_size = 0;
+
+	if (!sc->criteria_set)
+		return true;
+
+	if (!get_dev_size(disk_fd, NULL, &dev_size) || dev_size < sc->min_size)
+		return false;
+
+	if (!get_dev_sector_size(disk_fd, NULL, &dev_sector_size) ||
+	    sc->sector_size != dev_sector_size)
+		return false;
+
+	return true;
+}
+
+/**
+ * devid_matches_criteria() - check if device referenced by devid matches spare criteria.
+ * @devid: devid of the device to check.
+ * @sc: criteria to test.
+ *
+ * Return: true if disk matches criteria, false otherwise.
+ */
+bool devid_matches_criteria(dev_t devid, struct spare_criteria *sc)
+{
+	char buf[NAME_MAX];
+	bool ret;
+	int fd;
+
+	if (!sc->criteria_set)
+		return true;
+
+	snprintf(buf, NAME_MAX, "%d:%d", major(devid), minor(devid));
+
+	fd = dev_open(buf, O_RDONLY);
+	if (!is_fd_valid(fd))
+		return false;
+
+	/* Error code inherited */
+	ret = disk_fd_matches_criteria(fd, sc);
+
+	close(fd);
+	return ret;
+}
+
 /* Pick all spares matching given criteria from a container
  * if min_size == 0 do not check size
  * if domlist == NULL do not check domains
@@ -2111,28 +2131,13 @@ struct mdinfo *container_choose_spares(struct supertype *st,
 	dp = &disks->devs;
 	disks->array.spare_disks = 0;
 	while (*dp) {
-		int found = 0;
+		bool found = false;
+
 		d = *dp;
 		if (d->disk.state == 0) {
-			/* check if size is acceptable */
-			unsigned long long dev_size;
-			unsigned int dev_sector_size;
-			int size_valid = 0;
-			int sector_size_valid = 0;
-
 			dev_t dev = makedev(d->disk.major,d->disk.minor);
 
-			if (!criteria->min_size ||
-			   (dev_size_from_id(dev,  &dev_size) &&
-			    dev_size >= criteria->min_size))
-				size_valid = 1;
-
-			if (!criteria->sector_size ||
-			    (dev_sector_size_from_id(dev, &dev_sector_size) &&
-			     criteria->sector_size == dev_sector_size))
-				sector_size_valid = 1;
-
-			found = size_valid && sector_size_valid;
+			found = devid_matches_criteria(dev, criteria);
 
 			/* check if domain matches */
 			if (found && domlist) {
@@ -2141,7 +2146,8 @@ struct mdinfo *container_choose_spares(struct supertype *st,
 					pol_add(&pol, pol_domain,
 						spare_group, NULL);
 				if (domain_test(domlist, pol, metadata) != 1)
-					found = 0;
+					found = false;
+
 				dev_policy_free(pol);
 			}
 		}
-- 
2.40.1