Merging upstream version 4.2+20230223.

Signed-off-by: Daniel Baumann <daniel@debian.org>

util.c

@@ -35,7 +35,6 @@
 #include	<poll.h>
 #include	<ctype.h>
 #include	<dirent.h>
-#include	<signal.h>
 #include	<dlfcn.h>
 
 
@@ -167,7 +166,7 @@ retry:
 		pr_err("error %d when get PW mode on lock %s\n", errno, str);
 		/* let's try several times if EAGAIN happened */
 		if (dlm_lock_res->lksb.sb_status == EAGAIN && retry_count < 10) {
-			sleep(10);
+			sleep_for(10, 0, true);
 			retry_count++;
 			goto retry;
 		}
@@ -268,7 +267,7 @@ int md_array_active(int fd)
 		 * GET_ARRAY_INFO doesn't provide access to the proper state
 		 * information, so fallback to a basic check for raid_disks != 0
 		 */
-		ret = ioctl(fd, GET_ARRAY_INFO, &array);
+		ret = md_get_array_info(fd, &array);
 	}
 
 	return !ret;
@@ -969,47 +968,30 @@ dev_t devnm2devid(char *devnm)
 	return 0;
 }
 
+/**
+ * get_md_name() - Get main dev node of the md device.
+ * @devnm: Md device name or path.
+ *
+ * Function checks if the full name was passed and returns md name
+ * if it is the MD device.
+ *
+ * Return: Main dev node of the md device or NULL if not found.
+ */
 char *get_md_name(char *devnm)
 {
-	/* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */
-	/* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */
-
-	static char devname[50];
+	static char devname[NAME_MAX];
 	struct stat stb;
-	dev_t rdev = devnm2devid(devnm);
-	char *dn;
 
-	if (rdev == 0)
-		return 0;
-	if (strncmp(devnm, "md_", 3) == 0) {
-		snprintf(devname, sizeof(devname), "/dev/md/%s",
-			devnm + 3);
-		if (stat(devname, &stb) == 0 &&
-		    (S_IFMT&stb.st_mode) == S_IFBLK && (stb.st_rdev == rdev))
-			return devname;
-	}
-	snprintf(devname, sizeof(devname), "/dev/%s", devnm);
-	if (stat(devname, &stb) == 0 && (S_IFMT&stb.st_mode) == S_IFBLK &&
-	    (stb.st_rdev == rdev))
+	if (strncmp(devnm, "/dev/", 5) == 0)
+		snprintf(devname, sizeof(devname), "%s", devnm);
+	else
+		snprintf(devname, sizeof(devname), "/dev/%s", devnm);
+
+	if (!is_mddev(devname))
+		return NULL;
+	if (stat(devname, &stb) == 0 && (S_IFMT&stb.st_mode) == S_IFBLK)
 		return devname;
 
-	snprintf(devname, sizeof(devname), "/dev/md/%s", devnm+2);
-	if (stat(devname, &stb) == 0 && (S_IFMT&stb.st_mode) == S_IFBLK &&
-	    (stb.st_rdev == rdev))
-		return devname;
-
-	dn = map_dev(major(rdev), minor(rdev), 0);
-	if (dn)
-		return dn;
-	snprintf(devname, sizeof(devname), "/dev/.tmp.%s", devnm);
-	if (mknod(devname, S_IFBLK | 0600, rdev) == -1)
-		if (errno != EEXIST)
-			return NULL;
-
-	if (stat(devname, &stb) == 0 && (S_IFMT&stb.st_mode) == S_IFBLK &&
-	    (stb.st_rdev == rdev))
-		return devname;
-	unlink(devname);
 	return NULL;
 }
 
@@ -1028,6 +1010,20 @@ int get_maj_min(char *dev, int *major, int *minor)
 		*e == 0);
 }
 
+/**
+ * is_bit_set() - get bit value by index.
+ * @val: value.
+ * @index: index of the bit (LSB numbering).
+ *
+ * Return: bit value.
+ */
+bool is_bit_set(int *val, unsigned char index)
+{
+	if ((*val) & (1 << index))
+		return true;
+	return false;
+}
+
 int dev_open(char *dev, int flags)
 {
 	/* like 'open', but if 'dev' matches %d:%d, create a temp
@@ -1086,7 +1082,7 @@ int open_dev_excl(char *devnm)
 	int i;
 	int flags = O_RDWR;
 	dev_t devid = devnm2devid(devnm);
-	long delay = 1000;
+	unsigned int delay = 1; // miliseconds
 
 	sprintf(buf, "%d:%d", major(devid), minor(devid));
 	for (i = 0; i < 25; i++) {
@@ -1099,8 +1095,8 @@ int open_dev_excl(char *devnm)
 		}
 		if (errno != EBUSY)
 			return fd;
-		usleep(delay);
-		if (delay < 200000)
+		sleep_for(0, MSEC_TO_NSEC(delay), true);
+		if (delay < 200)
 			delay *= 2;
 	}
 	return -1;
@@ -1124,7 +1120,7 @@ void wait_for(char *dev, int fd)
 {
 	int i;
 	struct stat stb_want;
-	long delay = 1000;
+	unsigned int delay = 1; // miliseconds
 
 	if (fstat(fd, &stb_want) != 0 ||
 	    (stb_want.st_mode & S_IFMT) != S_IFBLK)
@@ -1136,8 +1132,8 @@ void wait_for(char *dev, int fd)
 		    (stb.st_mode & S_IFMT) == S_IFBLK &&
 		    (stb.st_rdev == stb_want.st_rdev))
 			return;
-		usleep(delay);
-		if (delay < 200000)
+		sleep_for(0, MSEC_TO_NSEC(delay), true);
+		if (delay < 200)
 			delay *= 2;
 	}
 	if (i == 25)
@@ -1822,7 +1818,7 @@ int hot_remove_disk(int mdfd, unsigned long dev, int force)
 	while ((ret = ioctl(mdfd, HOT_REMOVE_DISK, dev)) == -1 &&
 	       errno == EBUSY &&
 	       cnt-- > 0)
-		usleep(10000);
+		sleep_for(0, MSEC_TO_NSEC(10), true);
 
 	return ret;
 }
@@ -1835,7 +1831,7 @@ int sys_hot_remove_disk(int statefd, int force)
 	while ((ret = write(statefd, "remove", 6)) == -1 &&
 	       errno == EBUSY &&
 	       cnt-- > 0)
-		usleep(10000);
+		sleep_for(0, MSEC_TO_NSEC(10), true);
 	return ret == 6 ? 0 : -1;
 }
 
@@ -2376,3 +2372,27 @@ out:
 	close(fd_zero);
 	return ret;
 }
+
+/**
+ * sleep_for() - Sleeps for specified time.
+ * @sec: Seconds to sleep for.
+ * @nsec: Nanoseconds to sleep for, has to be less than one second.
+ * @wake_after_interrupt: If set, wake up if interrupted.
+ *
+ * Function immediately returns if error different than EINTR occurs.
+ */
+void sleep_for(unsigned int sec, long nsec, bool wake_after_interrupt)
+{
+	struct timespec delay = {.tv_sec = sec, .tv_nsec = nsec};
+
+	assert(nsec < MSEC_TO_NSEC(1000));
+
+	do {
+		errno = 0;
+		nanosleep(&delay, &delay);
+		if (errno != 0 && errno != EINTR) {
+			pr_err("Error sleeping for %us %ldns: %s\n", sec, nsec, strerror(errno));
+			return;
+		}
+	} while (!wake_after_interrupt && errno == EINTR);
+}