mdadm-0.8mdadm-0.8

1 files changed, 149 insertions, 0 deletions

diff --git a/Query.c b/Query.c
new file mode 100644
index 0000000..c65d83a
--- /dev/null
+++ b/Query.c
@@ -0,0 +1,149 @@
+/*
+ * mdadm - manage Linux "md" devices aka RAID arrays.
+ *
+ * Copyright (C) 2002 Neil Brown <neilb@cse.unsw.edu.au>
+ *
+ *
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation; either version 2 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program; if not, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *    Author: Neil Brown
+ *    Email: <neilb@cse.unsw.edu.au>
+ *    Paper: Neil Brown
+ *           School of Computer Science and Engineering
+ *           The University of New South Wales
+ *           Sydney, 2052
+ *           Australia
+ */
+
+#include	"mdadm.h"
+#include	"md_p.h"
+#include	"md_u.h"
+
+int Query(char *dev)
+{
+	/* Give a brief description of the device,
+	 * whether it is an md device and whether it has 
+	 * a superblock
+	 */
+	int fd = open(dev, O_RDONLY, 0);
+	int vers;
+	int ioctlerr;
+	int superror, superrno;
+	mdp_super_t super;
+	mdu_array_info_t array;
+	unsigned long long larray_size;
+	unsigned long array_size;
+	struct stat stb;
+	char *mddev;
+	mdu_disk_info_t disc;
+	char *activity;
+
+	if (fd < 0){
+		fprintf(stderr, Name ": cannot open %s: %s\n",
+			dev, strerror(errno));
+		return 1;
+	}
+
+	vers = md_get_version(fd);
+	if (ioctl(fd, GET_ARRAY_INFO, &array)<0)
+		ioctlerr = errno;
+	else ioctlerr = 0;
+	superror = load_super(fd, &super);
+	superrno = errno;
+ 
+	fstat(fd, &stb);
+
+	if (vers>=9000 && !ioctlerr) {
+#ifdef BLKGETSIZE64
+		if (ioctl(fd, BLKGETSIZE64, &larray_size)==0)
+			;
+		else
+#endif
+			if (ioctl(fd, BLKGETSIZE, &array_size)==0)
+				larray_size = array_size<<9;
+			else larray_size = 0;
+	}
+	close(fd);
+
+	if (vers < 0) 
+		printf("%s: is not an md array\n", dev);
+	else if (vers < 9000)
+		printf("%s: is an md device, but kernel cannot provide details\n", dev);
+	else if (ioctlerr == ENODEV)
+		printf("%s: is an md device which is not active\n", dev);
+	else if (ioctlerr)
+		printf("%s: is an md device, but gives \"%s\" when queried\n",
+		       dev, strerror(ioctlerr));
+	else {
+		printf("%s: %s %s %d devices, %d spare%s. Use mdadm --detail for more detail.\n",
+		       dev,
+		       human_size_brief(larray_size),
+		       map_num(pers, array.level),
+		       array.raid_disks,
+		       array.spare_disks, array.spare_disks==1?"":"s");
+	}
+	switch(superror) {
+	case 1:
+		printf("%s: cannot find device size: %s\n",
+		       dev, strerror(superrno));
+		break;
+	case 2:
+		printf("%s: is too small to be an md componenet.\n",
+		       dev);
+		break;
+	case 3:
+		printf("%s: Cannot seek to superblock: %s\n",
+		       dev, strerror(superrno));
+		break;
+	case 4:
+		printf("%s: Cannot read md superblock.\n",
+		       dev);
+		break;
+	case 5:
+		printf("%s: No md super block found, not an md component.\n",
+		       dev);
+		break;
+	case 6:
+		printf("%s: md superblock present with wrong version: %d\n",
+		       dev, super.major_version);
+		break;
+	default:
+		/* array might be active... */
+		mddev = get_md_name(super.md_minor);
+		disc.number = super.this_disk.number;
+		activity = "inactive";
+		if (mddev && (fd = open(mddev, O_RDONLY))>=0) {
+			if (md_get_version(fd) >= 9000 &&	
+			    ioctl(fd, GET_ARRAY_INFO, &array)>= 0) {
+				if (ioctl(fd, GET_DISK_INFO, &disc) >= 0 &&
+				    MKDEV(disc.major,disc.minor) == stb.st_rdev)
+					activity = "active";
+				else
+					activity = "mismatch";
+			}
+			close(fd);
+		}
+		printf("%s: device %d in %d device %s %s md%d.  Use mdadm --examine for more detail.\n",
+		       dev, 
+		       super.this_disk.number, super.raid_disks,
+		       activity,
+		       map_num(pers, super.level),
+		       super.md_minor);
+		break;
+	}
+	return 0;
+}
+
+