merge partition code

lib/device/device.c

@@ -27,38 +27,213 @@
 #include <string.h>
 #include <errno.h>
 #include <sys/ioctl.h>
+
+#include "dbg_malloc.h"
+#include "log.h"
+#include "dev-manager.h"
+#include "metadata.h"
+#include "device.h"
+
 #include <linux/fs.h>
 #include <linux/major.h>
 #include <linux/genhd.h>
 
-#include "device.h"
-#include "log.h"
+int _get_partition_type(struct dev_mgr *dm, struct device *d);
 
 int do_ioctl(const char *file, int mode, unsigned long cmd, void *req)
 {
-        int ret, fd;
+	int ret, fd;
 
-        if ((fd = open(file, mode)) < 0) {
-                log_sys_err("open");
-                return errno;
-        }
+	if ((fd = open(file, mode)) < 0) {
+		log_sys_err("open");
+		return fd;
+	}
 
-        if ((ret = ioctl(fd, cmd, req)) < 0) {
-                log_sys_err("ioctl");
-                ret = errno;
-        }
-
-        close(fd);
-        return ret;
-}
-
-int device_get_size(const char *dev_name)
-{
-	int ret, r;
-
-	log_verbose("Getting device size");
-	if (!(ret = do_ioctl(dev_name, O_RDONLY, BLKGETSIZE, &r)))
-		return r;
+	if ((ret = ioctl(fd, cmd, req)) < 0) {
+		log_sys_err("ioctl");
+	}
 
+	close(fd);
 	return ret;
 }
+
+long device_get_size(const char *dev_name)
+{
+	int ret;
+	long size;
+
+	log_verbose("Getting device size");
+	if ((ret = do_ioctl(dev_name, O_RDONLY, BLKGETSIZE, &size)) < 0)
+		return ret;
+
+	return size;
+}
+
+#define MINOR_PART(dm, d) (MINOR((d)->dev) % dev_max_partitions(dm, (d)->dev))
+
+int is_whole_disk(struct dev_mgr *dm, struct device *d)
+{
+	return (MINOR_PART(dm, d)) ? 0 : 1;
+}
+
+int is_extended_partition(struct dev_mgr *dm, struct device *d)
+{
+	return (MINOR_PART(dm, d) > 4) ? 1 : 0;
+}
+
+struct device *dev_primary(struct dev_mgr *dm, struct device *d)
+{
+	struct device *ret;
+
+	ret = dev_by_dev(dm, d->dev - MINOR_PART(dm, d));
+	/* FIXME: Needs replacing with a 'refresh' */
+	if (!ret) {
+		init_dev_scan(dm);
+		ret = dev_by_dev(dm, d->dev - MINOR_PART(dm, d));
+	}
+
+	return ret;
+
+}
+
+int partition_type_is_lvm(struct dev_mgr *dm, struct device *d)
+{
+	int pt;
+
+	pt = _get_partition_type(dm, d);
+
+	if (!pt) {
+		if (is_whole_disk(dm, d))
+			/* FIXME: Overloaded pt=0 in error cases */
+			return 1;
+		else {
+			log_error
+			    ("%s: missing partition table "
+			     "on partitioned device", d->name);
+			return 0;
+		}
+	}
+
+	if (is_whole_disk(dm, d)) {
+		log_error("%s: looks to possess partition table", d->name);
+		return 0;
+	}
+
+	/* check part type */
+	if (pt != LVM_PARTITION && pt != LVM_NEW_PARTITION) {
+		log_error("%s: invalid partition type 0x%x "
+			  "(must be 0x%x)", d->name, pt, LVM_NEW_PARTITION);
+		return 0;
+	}
+
+	if (pt == LVM_PARTITION) {
+		log_error
+		    ("%s: old LVM partition type found - please change to 0x%x",
+		     d->name, LVM_NEW_PARTITION);
+		return 0;
+	}
+
+	return 1;
+}
+
+int _get_partition_type(struct dev_mgr *dm, struct device *d)
+{
+	int pv_handle = -1;
+	struct device *primary;
+	ssize_t read_ret;
+	ssize_t bytes_read = 0;
+	char *buffer;
+	unsigned short *s_buffer;
+	struct partition *part;
+	loff_t offset = 0;
+	loff_t extended_offset = 0;
+	int part_sought;
+	int part_found = 0;
+	int first_partition = 1;
+	int extended_partition = 0;
+	int p;
+
+	if (!(primary = dev_primary(dm, d))) {
+		log_error
+		    ("Failed to find main device containing partition %s",
+		     d->name);
+		return 0;
+	}
+
+	if (!(buffer = dbg_malloc(SECTOR_SIZE))) {
+		log_error("Failed to allocate partition table buffer");
+		return 0;
+	}
+
+	/* Get partition table */
+	if ((pv_handle = open(primary->name, O_RDONLY)) < 0) {
+		log_error("%s: open failed: %s", primary->name,
+			  strerror(errno));
+		return 0;
+	}
+
+	s_buffer = (unsigned short *) buffer;
+	part = (struct partition *) (buffer + 0x1be);
+	part_sought = MINOR_PART(dm, d);
+
+	do {
+		bytes_read = 0;
+
+		if (llseek(pv_handle, offset * SECTOR_SIZE, SEEK_SET) == -1) {
+			log_error("%s: llseek failed: %s",
+				  primary->name, strerror(errno));
+			return 0;
+		}
+
+		while ((bytes_read < SECTOR_SIZE) &&
+		       (read_ret =
+			read(pv_handle, buffer + bytes_read,
+			     SECTOR_SIZE - bytes_read)) != -1)
+			bytes_read += read_ret;
+
+		if (read_ret == -1) {
+			log_error("%s: read failed: %s", primary->name,
+				  strerror(errno));
+			return 0;
+		}
+
+		if (s_buffer[255] == 0xAA55) {
+			if (is_whole_disk(dm, d))
+				return -1;
+		} else
+			return 0;
+
+		extended_partition = 0;
+
+		/* Loop through primary partitions */
+		for (p = 0; p < 4; p++) {
+			if (part[p].sys_ind == DOS_EXTENDED_PARTITION ||
+			    part[p].sys_ind == LINUX_EXTENDED_PARTITION
+			    || part[p].sys_ind == WIN98_EXTENDED_PARTITION) {
+				extended_partition = 1;
+				offset = extended_offset + part[p].start_sect;
+				if (extended_offset == 0)
+					extended_offset = part[p].start_sect;
+				if (first_partition == 1)
+					part_found++;
+			} else if (first_partition == 1) {
+				if (p == part_sought) {
+					if (part[p].sys_ind == 0) {
+						/* missing primary? */
+						return 0;
+					}
+				} else
+					part_found++;
+			} else if (!part[p].sys_ind)
+				part_found++;
+
+			if (part_sought == part_found)
+				return part[p].sys_ind;
+
+		}
+		first_partition = 0;
+	}
+	while (extended_partition == 1);
+
+	return 0;
+}