util-linux/util-linux-2.14.1-disk_utils_raw_should_use_ioctl_to_create_device.patch

From: Jeff Mahoney <jeffm@suse.com>
Subject: [PATCH] raw: Use the RAW_SETBIND ioctl without stat'ing the raw# file
References: bnc#450675

 The in-kernel ioctl code creates a raw# device on-demand. udev will create
 the /dev/raw/raw# file when the device is created automatically.

 The current raw userspace code wants to stat the file before using it,
 which is unnecessary for setting up the raw device.

 This patch stats the file only when query() is called as a singleton, and
 it's doubtful it's needed even there. I modified as little code as I could,
 though.

 Without this patch raw devices WILL NOT WORK on SLE11.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
---
 disk-utils/raw.c |   54 ++++++++++++++++++++++++++++--------------------------
 1 file changed, 28 insertions(+), 26 deletions(-)

--- a/disk-utils/raw.c
+++ b/disk-utils/raw.c
@@ -41,7 +41,7 @@ int	master_fd;
 int	raw_minor;
 
 void open_raw_ctl(void);
-int  query(int minor, int quiet);
+int  query(int minor, const char *raw_name, int quiet);
 int  bind (int minor, int block_major, int block_minor);
 
 
@@ -96,7 +96,7 @@ int main(int argc, char *argv[])
 		if (optind < argc)
 			usage(1);
 		for (i = 1; i < RAW_NR_MINORS; i++)
-			query(i, 1);
+			query(i, NULL, 1);
 		exit(0);
 	}
 	
@@ -122,28 +122,8 @@ int main(int argc, char *argv[])
 		exit(2);
 	}
 
-	err = stat(raw_name, &statbuf);
-	if (err) {
-		fprintf (stderr, "Cannot locate raw device '%s' (%s)\n",
-			 raw_name, strerror(errno));
-		exit(2);
-	}
-	
-	if (!S_ISCHR(statbuf.st_mode)) {
-		fprintf (stderr, "Raw device '%s' is not a character dev\n",
-			 raw_name);
-		exit(2);
-	}
-	if (major(statbuf.st_rdev) != RAW_MAJOR) {
-		fprintf (stderr, "Device '%s' is not a raw dev\n",
-			 raw_name);
-		exit(2);
-	}
-
-	raw_minor = minor(statbuf.st_rdev);
-
 	if (do_query)
-		return query(raw_minor, 0);
+		return query(raw_minor, raw_name, 0);
 
 	/* 
 	 * It's not a query, so we still have some parsing to do.  Have
@@ -205,13 +185,35 @@ void open_raw_ctl(void)
 	}
 }
 
-int query(int minor, int quiet)
+int query(int raw_minor, const char *raw_name, int quiet)
 {
 	struct raw_config_request rq;
 	static int has_worked = 0;
 	int err;
+	struct stat statbuf;
+
+	if (raw_name) {
+		err = stat(raw_name, &statbuf);
+		if (err) {
+			fprintf (stderr, "Cannot locate raw device '%s' (%s)\n",
+				 raw_name, strerror(errno));
+			exit(2);
+		}
+
+		if (!S_ISCHR(statbuf.st_mode)) {
+			fprintf (stderr, "Raw device '%s' is not a character dev\n",
+				 raw_name);
+			exit(2);
+		}
+		if (major(statbuf.st_rdev) != RAW_MAJOR) {
+			fprintf (stderr, "Device '%s' is not a raw dev\n",
+				 raw_name);
+			exit(2);
+		}
+		raw_minor = minor(statbuf.st_rdev);
+	}
 
-	rq.raw_minor = minor;
+	rq.raw_minor = raw_minor;
 	err = ioctl(master_fd, RAW_GETBIND, &rq);
 	if (err < 0) {
 		if (quiet && errno == ENODEV)
@@ -230,7 +232,7 @@ int query(int minor, int quiet)
 	if (quiet && !rq.block_major && !rq.block_minor)
 		return 0;
 	printf (RAWDEVDIR "raw%d:	bound to major %d, minor %d\n",
-		minor, (int) rq.block_major, (int) rq.block_minor);
+		raw_minor, (int) rq.block_major, (int) rq.block_minor);
 	return 0;
 }