* [PATCH 1/4] mdadm: define DEV_MD_DIR
2023-03-23 16:50 [PATCH 0/4] Few config related refactors Mariusz Tkaczyk
@ 2023-03-23 16:50 ` Mariusz Tkaczyk
2023-03-23 16:50 ` [PATCH 2/4] mdadm: define DEV_NUM_PREF Mariusz Tkaczyk
` (4 subsequent siblings)
5 siblings, 0 replies; 8+ messages in thread
From: Mariusz Tkaczyk @ 2023-03-23 16:50 UTC (permalink / raw)
To: jes; +Cc: linux-raid, colyli, xni
It is used many times. Additionally define _LEN to avoid repeated
strlen() calls when length is needed.
Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
---
Create.c | 7 +++----
Detail.c | 9 ++++-----
Incremental.c | 4 ++--
Monitor.c | 32 ++++++++++++++++++--------------
config.c | 10 +++++-----
lib.c | 2 +-
mapfile.c | 12 ++++++------
mdadm.h | 8 ++++++++
mdopen.c | 6 +++---
super-ddf.c | 2 +-
super-intel.c | 2 +-
super1.c | 3 +--
sysfs.c | 2 +-
13 files changed, 54 insertions(+), 45 deletions(-)
diff --git a/Create.c b/Create.c
index bbe9e13d..f3a02a2e 100644
--- a/Create.c
+++ b/Create.c
@@ -1029,10 +1029,9 @@ int Create(struct supertype *st, char *mddev,
* it could be in conflict with already existing device
* e.g. container, array
*/
- if (strncmp(chosen_name, "/dev/md/", 8) == 0 &&
- map_by_name(&map, chosen_name+8) != NULL) {
- pr_err("Array name %s is in use already.\n",
- chosen_name);
+ if (strncmp(chosen_name, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0 &&
+ map_by_name(&map, chosen_name + DEV_MD_DIR_LEN)) {
+ pr_err("Array name %s is in use already.\n", chosen_name);
close(mdfd);
map_unlock(&map);
udev_unblock();
diff --git a/Detail.c b/Detail.c
index 4ef26460..206d88e3 100644
--- a/Detail.c
+++ b/Detail.c
@@ -254,10 +254,9 @@ int Detail(char *dev, struct context *c)
fname_from_uuid(st, info, nbuf, ':');
printf("MD_UUID=%s\n", nbuf + 5);
mp = map_by_uuid(&map, info->uuid);
- if (mp && mp->path &&
- strncmp(mp->path, "/dev/md/", 8) == 0) {
+ if (mp && mp->path && strncmp(mp->path, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0) {
printf("MD_DEVNAME=");
- print_escape(mp->path + 8);
+ print_escape(mp->path + DEV_MD_DIR_LEN);
putchar('\n');
}
@@ -273,9 +272,9 @@ int Detail(char *dev, struct context *c)
printf("MD_UUID=%s\n", nbuf+5);
}
if (mp && mp->path &&
- strncmp(mp->path, "/dev/md/", 8) == 0) {
+ strncmp(mp->path, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0) {
printf("MD_DEVNAME=");
- print_escape(mp->path+8);
+ print_escape(mp->path + DEV_MD_DIR_LEN);
putchar('\n');
}
map_free(map);
diff --git a/Incremental.c b/Incremental.c
index 09b94b9f..b3dc499a 100644
--- a/Incremental.c
+++ b/Incremental.c
@@ -460,8 +460,8 @@ int Incremental(struct mddev_dev *devlist, struct context *c,
info.array.working_disks ++;
}
- if (strncmp(chosen_name, "/dev/md/", 8) == 0)
- md_devname = chosen_name+8;
+ if (strncmp(chosen_name, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0)
+ md_devname = chosen_name + DEV_MD_DIR_LEN;
else
md_devname = chosen_name;
if (c->export) {
diff --git a/Monitor.c b/Monitor.c
index 44918184..3273f2fb 100644
--- a/Monitor.c
+++ b/Monitor.c
@@ -36,9 +36,18 @@
#define EVENT_NAME_MAX 32
#define AUTOREBUILD_PID_PATH MDMON_DIR "/autorebuild.pid"
+/**
+ * struct state - external array or container properties.
+ * @devname: has length of %DEV_MD_DIR + device name + terminating byte
+ * @devnm: to sync with mdstat info
+ * @parent_devnm: or subarray, devnm of parent, for others, ""
+ * @subarray: for a container it is a link to first subarray, for a subarray it is a link to next
+ * subarray in the same container
+ * @parent: for a subarray it is a link to its container
+ */
struct state {
- char devname[MD_NAME_MAX + sizeof("/dev/md/")]; /* length of "/dev/md/" + device name + terminating byte*/
- char devnm[MD_NAME_MAX]; /* to sync with mdstat info */
+ char devname[MD_NAME_MAX + sizeof(DEV_MD_DIR)];
+ char devnm[MD_NAME_MAX];
unsigned int utime;
int err;
char *spare_group;
@@ -49,15 +58,10 @@ struct state {
int devstate[MAX_DISKS];
dev_t devid[MAX_DISKS];
int percent;
- char parent_devnm[MD_NAME_MAX]; /* For subarray, devnm of parent.
- * For others, ""
- */
+ char parent_devnm[MD_NAME_MAX];
struct supertype *metadata;
- struct state *subarray;/* for a container it is a link to first subarray
- * for a subarray it is a link to next subarray
- * in the same container */
- struct state *parent; /* for a subarray it is a link to its container
- */
+ struct state *subarray;
+ struct state *parent;
struct state *next;
};
@@ -252,8 +256,8 @@ int Monitor(struct mddev_dev *devlist,
continue;
st = xcalloc(1, sizeof *st);
- snprintf(st->devname, MD_NAME_MAX + sizeof("/dev/md/"),
- "/dev/md/%s", basename(mdlist->devname));
+ snprintf(st->devname, MD_NAME_MAX + sizeof(DEV_MD_DIR), DEV_MD_DIR "%s",
+ basename(mdlist->devname));
st->next = statelist;
st->devnm[0] = 0;
st->percent = RESYNC_UNKNOWN;
@@ -274,7 +278,7 @@ int Monitor(struct mddev_dev *devlist,
st = xcalloc(1, sizeof *st);
mdlist = conf_get_ident(dv->devname);
- snprintf(st->devname, MD_NAME_MAX + sizeof("/dev/md/"), "%s", dv->devname);
+ snprintf(st->devname, MD_NAME_MAX + sizeof(DEV_MD_DIR), "%s", dv->devname);
st->next = statelist;
st->devnm[0] = 0;
st->percent = RESYNC_UNKNOWN;
@@ -942,7 +946,7 @@ static int add_new_arrays(struct mdstat_ent *mdstat, struct state **statelist)
continue;
}
- snprintf(st->devname, MD_NAME_MAX + sizeof("/dev/md/"), "%s", name);
+ snprintf(st->devname, MD_NAME_MAX + sizeof(DEV_MD_DIR), "%s", name);
if ((fd = open(st->devname, O_RDONLY)) < 0 ||
md_get_array_info(fd, &array) < 0) {
/* no such array */
diff --git a/config.c b/config.c
index eeedd0c6..59d5bfb6 100644
--- a/config.c
+++ b/config.c
@@ -405,7 +405,7 @@ void arrayline(char *line)
* or anything that doesn't start '/' or '<'
*/
if (strcasecmp(w, "<ignore>") == 0 ||
- strncmp(w, "/dev/md/", 8) == 0 ||
+ strncmp(w, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0 ||
(w[0] != '/' && w[0] != '<') ||
(strncmp(w, "/dev/md", 7) == 0 &&
is_number(w + 7)) ||
@@ -1102,13 +1102,13 @@ int devname_matches(char *name, char *match)
* mdNN with NN
* then just strcmp
*/
- if (strncmp(name, "/dev/md/", 8) == 0)
- name += 8;
+ if (strncmp(name, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0)
+ name += DEV_MD_DIR_LEN;
else if (strncmp(name, "/dev/", 5) == 0)
name += 5;
- if (strncmp(match, "/dev/md/", 8) == 0)
- match += 8;
+ if (strncmp(match, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0)
+ match += DEV_MD_DIR_LEN;
else if (strncmp(match, "/dev/", 5) == 0)
match += 5;
diff --git a/lib.c b/lib.c
index e395b28d..65ea51e0 100644
--- a/lib.c
+++ b/lib.c
@@ -313,7 +313,7 @@ char *map_dev_preferred(int major, int minor, int create,
for (p = devlist; p; p = p->next)
if (p->major == major && p->minor == minor) {
- if (strncmp(p->name, "/dev/md/",8) == 0 ||
+ if (strncmp(p->name, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0 ||
(prefer && strstr(p->name, prefer))) {
if (preferred == NULL ||
strlen(p->name) < strlen(preferred))
diff --git a/mapfile.c b/mapfile.c
index ac351768..34fea179 100644
--- a/mapfile.c
+++ b/mapfile.c
@@ -320,9 +320,9 @@ struct map_ent *map_by_name(struct map_ent **map, char *name)
for (mp = *map ; mp ; mp = mp->next) {
if (!mp->path)
continue;
- if (strncmp(mp->path, "/dev/md/", 8) != 0)
+ if (strncmp(mp->path, DEV_MD_DIR, DEV_MD_DIR_LEN) != 0)
continue;
- if (strcmp(mp->path+8, name) != 0)
+ if (strcmp(mp->path + DEV_MD_DIR_LEN, name) != 0)
continue;
if (!mddev_busy(mp->devnm)) {
mp->bad = 1;
@@ -413,7 +413,7 @@ void RebuildMap(void)
devid = devnm2devid(md->devnm);
path = map_dev(major(devid), minor(devid), 0);
if (path == NULL ||
- strncmp(path, "/dev/md/", 8) != 0) {
+ strncmp(path, DEV_MD_DIR, DEV_MD_DIR_LEN) != 0) {
/* We would really like a name that provides
* an MD_DEVNAME for udev.
* The name needs to be unique both in /dev/md/
@@ -434,7 +434,7 @@ void RebuildMap(void)
if (match && match->devname && match->devname[0] == '/') {
path = match->devname;
if (path[0] != '/') {
- strcpy(namebuf, "/dev/md/");
+ strcpy(namebuf, DEV_MD_DIR);
strcat(namebuf, path);
path = namebuf;
}
@@ -478,10 +478,10 @@ void RebuildMap(void)
while (conflict) {
if (unum >= 0)
- sprintf(namebuf, "/dev/md/%s%s%d",
+ sprintf(namebuf, DEV_MD_DIR "%s%s%d",
name, sep, unum);
else
- sprintf(namebuf, "/dev/md/%s",
+ sprintf(namebuf, DEV_MD_DIR "%s",
name);
unum++;
if (lstat(namebuf, &stb) != 0 &&
diff --git a/mdadm.h b/mdadm.h
index b9127f9a..cb644fd8 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -100,6 +100,14 @@ struct dlm_lksb {
#define DEFAULT_BITMAP_DELAY 5
#define DEFAULT_MAX_WRITE_BEHIND 256
+/* DEV_MD_DIR points to named MD devices directory.
+ * DEV_MD_DIR_LEN is a length with Null byte excluded.
+ */
+#ifndef DEV_MD_DIR
+#define DEV_MD_DIR "/dev/md/"
+#define DEV_MD_DIR_LEN (sizeof(DEV_MD_DIR) - 1)
+#endif /* DEV_MD_DIR */
+
/* MAP_DIR should be somewhere that persists across the pivotroot
* from early boot to late boot.
* /run seems to have emerged as the best standard.
diff --git a/mdopen.c b/mdopen.c
index d18c9319..ed86df60 100644
--- a/mdopen.c
+++ b/mdopen.c
@@ -188,12 +188,12 @@ int create_mddev(char *dev, char *name, int autof, int trustworthy,
parts = autof >> 3;
autof &= 7;
- strcpy(chosen, "/dev/md/");
+ strcpy(chosen, DEV_MD_DIR);
cname = chosen + strlen(chosen);
if (dev) {
- if (strncmp(dev, "/dev/md/", 8) == 0) {
- strcpy(cname, dev+8);
+ if (strncmp(dev, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0) {
+ strcpy(cname, dev + DEV_MD_DIR_LEN);
} else if (strncmp(dev, "/dev/", 5) == 0) {
char *e = dev + strlen(dev);
while (e > dev && isdigit(e[-1]))
diff --git a/super-ddf.c b/super-ddf.c
index b86c6acd..7213284e 100644
--- a/super-ddf.c
+++ b/super-ddf.c
@@ -1648,7 +1648,7 @@ static void brief_examine_subarrays_ddf(struct supertype *st, int verbose)
fname_from_uuid(st, &info, nbuf1, ':');
_ddf_array_name(namebuf, ddf, i);
printf("ARRAY%s%s container=%s member=%d UUID=%s\n",
- namebuf[0] == '\0' ? "" : " /dev/md/", namebuf,
+ namebuf[0] == '\0' ? "" : " " DEV_MD_DIR, namebuf,
nbuf+5, i, nbuf1+5);
}
}
diff --git a/super-intel.c b/super-intel.c
index e155a8ae..bbbd4dc2 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -2270,7 +2270,7 @@ static void brief_examine_subarrays_imsm(struct supertype *st, int verbose)
super->current_vol = i;
getinfo_super_imsm(st, &info, NULL);
fname_from_uuid(st, &info, nbuf1, ':');
- printf("ARRAY /dev/md/%.16s container=%s member=%d UUID=%s\n",
+ printf("ARRAY " DEV_MD_DIR "%.16s container=%s member=%d UUID=%s\n",
dev->volume, nbuf + 5, i, nbuf1 + 5);
}
}
diff --git a/super1.c b/super1.c
index f7020320..d0907370 100644
--- a/super1.c
+++ b/super1.c
@@ -642,8 +642,7 @@ static void brief_examine_super1(struct supertype *st, int verbose)
printf("ARRAY ");
if (nm) {
- printf("/dev/md/");
- print_escape(nm);
+ printf(DEV_MD_DIR "%s", nm);
putchar(' ');
}
if (verbose && c)
diff --git a/sysfs.c b/sysfs.c
index ca1d888f..94d02f53 100644
--- a/sysfs.c
+++ b/sysfs.c
@@ -1114,7 +1114,7 @@ void sysfsline(char *line)
if (strncasecmp(w, "name=", 5) == 0) {
char *devname = w + 5;
- if (strncmp(devname, "/dev/md/", 8) == 0) {
+ if (strncmp(devname, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0) {
if (sr->devname)
pr_err("Only give one device per SYSFS line: %s\n",
devname);
--
2.26.2
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH 3/4] mdadm: define is_devname_ignore()
2023-03-23 16:50 [PATCH 0/4] Few config related refactors Mariusz Tkaczyk
2023-03-23 16:50 ` [PATCH 1/4] mdadm: define DEV_MD_DIR Mariusz Tkaczyk
2023-03-23 16:50 ` [PATCH 2/4] mdadm: define DEV_NUM_PREF Mariusz Tkaczyk
@ 2023-03-23 16:50 ` Mariusz Tkaczyk
2023-03-23 16:50 ` [PATCH 4/4] mdadm: numbered names verification Mariusz Tkaczyk
` (2 subsequent siblings)
5 siblings, 0 replies; 8+ messages in thread
From: Mariusz Tkaczyk @ 2023-03-23 16:50 UTC (permalink / raw)
To: jes; +Cc: linux-raid, colyli, xni
Use function instead of direct checks across code.
Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
---
Incremental.c | 6 ++----
Monitor.c | 2 +-
config.c | 16 ++++++++++++++--
mdadm.c | 5 ++---
mdadm.h | 1 +
5 files changed, 20 insertions(+), 10 deletions(-)
diff --git a/Incremental.c b/Incremental.c
index b3dc499a..ebbbd4db 100644
--- a/Incremental.c
+++ b/Incremental.c
@@ -202,8 +202,7 @@ int Incremental(struct mddev_dev *devlist, struct context *c,
if (!match && rv == 2)
goto out;
- if (match && match->devname &&
- strcasecmp(match->devname, "<ignore>") == 0) {
+ if (match && match->devname && is_devname_ignore(match->devname) == true) {
if (c->verbose >= 0)
pr_err("array containing %s is explicitly ignored by mdadm.conf\n",
devname);
@@ -1564,8 +1563,7 @@ static int Incremental_container(struct supertype *st, char *devname,
break;
}
- if (match && match->devname &&
- strcasecmp(match->devname, "<ignore>") == 0) {
+ if (match && match->devname && is_devname_ignore(match->devname) == true) {
if (c->verbose > 0)
pr_err("array %s/%s is explicitly ignored by mdadm.conf\n",
match->container, match->member);
diff --git a/Monitor.c b/Monitor.c
index 3273f2fb..ce8d5802 100644
--- a/Monitor.c
+++ b/Monitor.c
@@ -250,7 +250,7 @@ int Monitor(struct mddev_dev *devlist,
if (mdlist->devname == NULL)
continue;
- if (strcasecmp(mdlist->devname, "<ignore>") == 0)
+ if (is_devname_ignore(mdlist->devname) == true)
continue;
if (!is_mddev(mdlist->devname))
continue;
diff --git a/config.c b/config.c
index f44cc1d3..e61c0496 100644
--- a/config.c
+++ b/config.c
@@ -119,6 +119,18 @@ int match_keyword(char *word)
return -1;
}
+/**
+ * is_devname_ignore() - check if &devname is a special "<ignore>" keyword.
+ */
+bool is_devname_ignore(char *devname)
+{
+ static const char keyword[] = "<ignore>";
+
+ if (strcasecmp(devname, keyword) == 0)
+ return true;
+ return false;
+}
+
/**
* ident_init() - Set defaults.
* @ident: ident pointer, not NULL.
@@ -404,7 +416,7 @@ void arrayline(char *line)
* <ignore>
* or anything that doesn't start '/' or '<'
*/
- if (strcasecmp(w, "<ignore>") == 0 ||
+ if (is_devname_ignore(w) == true ||
strncmp(w, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0 ||
(w[0] != '/' && w[0] != '<') ||
(strncmp(w, DEV_NUM_PREF, DEV_NUM_PREF_LEN) == 0 &&
@@ -571,7 +583,7 @@ void homehostline(char *line)
char *w;
for (w = dl_next(line); w != line; w = dl_next(w)) {
- if (strcasecmp(w, "<ignore>") == 0)
+ if (is_devname_ignore(w) == true)
require_homehost = 0;
else if (home_host == NULL) {
if (strcasecmp(w, "<none>") == 0)
diff --git a/mdadm.c b/mdadm.c
index 4685ad6b..cae37177 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -154,7 +154,7 @@ int main(int argc, char *argv[])
continue;
case HomeHost:
- if (strcasecmp(optarg, "<ignore>") == 0)
+ if (is_devname_ignore(optarg) == true)
c.require_homehost = 0;
else
c.homehost = optarg;
@@ -1749,8 +1749,7 @@ static int scan_assemble(struct supertype *ss,
int r;
if (a->assembled)
continue;
- if (a->devname &&
- strcasecmp(a->devname, "<ignore>") == 0)
+ if (a->devname && is_devname_ignore(a->devname) == true)
continue;
r = Assemble(ss, a->devname,
diff --git a/mdadm.h b/mdadm.h
index 63ec88a0..87fd4a57 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -1648,6 +1648,7 @@ extern void print_escape(char *str);
extern int use_udev(void);
extern unsigned long GCD(unsigned long a, unsigned long b);
extern int conf_name_is_free(char *name);
+extern bool is_devname_ignore(char *devname);
extern int conf_verify_devnames(struct mddev_ident *array_list);
extern int devname_matches(char *name, char *match);
extern struct mddev_ident *conf_match(struct supertype *st,
--
2.26.2
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH 4/4] mdadm: numbered names verification
2023-03-23 16:50 [PATCH 0/4] Few config related refactors Mariusz Tkaczyk
` (2 preceding siblings ...)
2023-03-23 16:50 ` [PATCH 3/4] mdadm: define is_devname_ignore() Mariusz Tkaczyk
@ 2023-03-23 16:50 ` Mariusz Tkaczyk
2023-03-24 2:13 ` [PATCH 0/4] Few config related refactors Xiao Ni
2023-05-08 20:26 ` Jes Sorensen
5 siblings, 0 replies; 8+ messages in thread
From: Mariusz Tkaczyk @ 2023-03-23 16:50 UTC (permalink / raw)
To: jes; +Cc: linux-raid, colyli, xni
New functions added to remove literals and make the code reusable.
Use parse_num() instead of is_numer().
Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
---
config.c | 17 ++---------------
lib.c | 2 +-
mdadm.h | 4 +++-
util.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 50 insertions(+), 17 deletions(-)
diff --git a/config.c b/config.c
index e61c0496..450880e3 100644
--- a/config.c
+++ b/config.c
@@ -385,17 +385,6 @@ void devline(char *line)
struct mddev_ident *mddevlist = NULL;
struct mddev_ident **mddevlp = &mddevlist;
-static int is_number(char *w)
-{
- /* check if there are 1 or more digits and nothing else */
- int digits = 0;
- while (*w && isdigit(*w)) {
- digits++;
- w++;
- }
- return (digits && ! *w);
-}
-
void arrayline(char *line)
{
char *w;
@@ -419,10 +408,8 @@ void arrayline(char *line)
if (is_devname_ignore(w) == true ||
strncmp(w, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0 ||
(w[0] != '/' && w[0] != '<') ||
- (strncmp(w, DEV_NUM_PREF, DEV_NUM_PREF_LEN) == 0 &&
- is_number(w + DEV_NUM_PREF_LEN)) ||
- (strncmp(w, "/dev/md_d", 9) == 0 &&
- is_number(w + 9))) {
+ is_devname_md_numbered(w) == true ||
+ is_devname_md_d_numbered(w) == true) {
/* This is acceptable */;
if (mis.devname)
pr_err("only give one device per ARRAY line: %s and %s\n",
diff --git a/lib.c b/lib.c
index 65ea51e0..fe5c8d2c 100644
--- a/lib.c
+++ b/lib.c
@@ -570,7 +570,7 @@ void free_line(char *line)
*
* Return: 0 on success, 1 otherwise.
*/
-int parse_num(int *dest, char *num)
+int parse_num(int *dest, const char *num)
{
char *c = NULL;
long temp;
diff --git a/mdadm.h b/mdadm.h
index 87fd4a57..b5d58448 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -1599,7 +1599,7 @@ int default_layout(struct supertype *st, int level, int verbose);
extern int is_near_layout_10(int layout);
extern int parse_layout_10(char *layout);
extern int parse_layout_faulty(char *layout);
-extern int parse_num(int *dest, char *num);
+extern int parse_num(int *dest, const char *num);
extern int parse_cluster_confirm_arg(char *inp, char **devname, int *slot);
extern int check_ext2(int fd, char *name);
extern int check_reiser(int fd, char *name);
@@ -1649,6 +1649,8 @@ extern int use_udev(void);
extern unsigned long GCD(unsigned long a, unsigned long b);
extern int conf_name_is_free(char *name);
extern bool is_devname_ignore(char *devname);
+extern bool is_devname_md_numbered(const char *devname);
+extern bool is_devname_md_d_numbered(const char *devname);
extern int conf_verify_devnames(struct mddev_ident *array_list);
extern int devname_matches(char *name, char *match);
extern struct mddev_ident *conf_match(struct supertype *st,
diff --git a/util.c b/util.c
index 9f1e1f7c..23372b7e 100644
--- a/util.c
+++ b/util.c
@@ -973,6 +973,50 @@ dev_t devnm2devid(char *devnm)
return 0;
}
+/**
+ * is_devname_numbered() - helper for numbered devname verification.
+ * @devname: path or name to check.
+ * @pref: expected devname prefix.
+ * @pref_len: prefix len.
+ */
+static bool is_devname_numbered(const char *devname, const char *pref, const int pref_len)
+{
+ int val;
+
+ assert(devname && pref);
+
+ if (strncmp(devname, pref, pref_len) != 0)
+ return false;
+
+ if (parse_num(&val, devname + pref_len) != 0)
+ return false;
+
+ if (val > 127)
+ return false;
+
+ return true;
+}
+
+/**
+ * is_devname_md_numbered() - check if &devname is numbered MD device (md).
+ * @devname: path or name to check.
+ */
+bool is_devname_md_numbered(const char *devname)
+{
+ return is_devname_numbered(devname, DEV_NUM_PREF, DEV_NUM_PREF_LEN);
+}
+
+/**
+ * is_devname_md_d_numbered() - check if &devname is secondary numbered MD device (md_d).
+ * @devname: path or name to check.
+ */
+bool is_devname_md_d_numbered(const char *devname)
+{
+ static const char d_dev[] = DEV_NUM_PREF "_d";
+
+ return is_devname_numbered(devname, d_dev, sizeof(d_dev) - 1);
+}
+
/**
* get_md_name() - Get main dev node of the md device.
* @devnm: Md device name or path.
--
2.26.2
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