path: root/usr/src/lib/libdiskmgt/common/partition.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <fcntl.h>
#include <libdevinfo.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/sunddi.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <sys/dkio.h>

#if defined(i386) || defined(__amd64)
#include <sys/dktp/fdisk.h>
#include <libfdisk.h>
#endif

#include "libdiskmgt.h"
#include "disks_private.h"
#include "partition.h"

#ifdef sparc
#define	les(val)	((((val)&0xFF)<<8)|(((val)>>8)&0xFF))
#define	lel(val)	(((unsigned)(les((val)&0x0000FFFF))<<16) | \
			    (les((unsigned)((val)&0xffff0000)>>16)))
#else
#define	les(val)	(val)
#define	lel(val)	(val)
#endif

#define	TOTAL_NUMPART	(FD_NUMPART + MAX_EXT_PARTS)

#define	ISIZE		FD_NUMPART * sizeof (struct ipart)

static int	desc_ok(descriptor_t *dp);
static int	get_attrs(descriptor_t *dp, struct ipart *iparts,
		    nvlist_t *attrs);
static int	get_parts(disk_t *disk, struct ipart *iparts, char *opath,
		    int opath_len);
static int	open_disk(disk_t *diskp, char *opath, int len);
static int	has_slices(descriptor_t *desc, int *errp);

descriptor_t **
partition_get_assoc_descriptors(descriptor_t *desc, dm_desc_type_t type,
    int *errp)
{
	if (!desc_ok(desc)) {
		*errp = ENODEV;
		return (NULL);
	}

	switch (type) {
	case DM_MEDIA:
		return (media_get_assocs(desc, errp));
	case DM_SLICE:
		if (!has_slices(desc, errp)) {
			if (*errp != 0) {
				return (NULL);
			}
			return (libdiskmgt_empty_desc_array(errp));
		}
		return (slice_get_assocs(desc, errp));
	}

	*errp = EINVAL;
	return (NULL);
}

/*
 * This is called by media/slice to get the associated partitions.
 * For a media desc. we just get all the partitions, but for a slice desc.
 * we just get the active solaris partition.
 */
descriptor_t **
partition_get_assocs(descriptor_t *desc, int *errp)
{
	descriptor_t	**partitions;
	int		pos;
	int		i;
	struct ipart	iparts[TOTAL_NUMPART];
	char		pname[MAXPATHLEN];
	int		conv_flag = 0;
#if defined(i386) || defined(__amd64)
	int		len;
#endif

	if (get_parts(desc->p.disk, iparts, pname, sizeof (pname)) != 0) {
		return (libdiskmgt_empty_desc_array(errp));
	}

	/* allocate the array for the descriptors */
	partitions = (descriptor_t **)calloc(TOTAL_NUMPART + 1,
	    sizeof (descriptor_t *));
	if (partitions == NULL) {
		*errp = ENOMEM;
		return (NULL);
	}

#if defined(i386) || defined(__amd64)
	/* convert part. name (e.g. c0d0p1) */
	len = strlen(pname);
	if (len > 1 && *(pname + (len - 2)) == 'p') {
		conv_flag = 1;
		*(pname + (len - 1)) = 0;
	}
#endif

	/*
	 * If this is a slice desc. we need the first active solaris partition
	 * and if there isn't one then we need the first solaris partition.
	 */
	if (desc->type == DM_SLICE) {
		for (i = 0; i < TOTAL_NUMPART; i++) {
			if (iparts[i].bootid == ACTIVE &&
			    (iparts[i].systid == SUNIXOS ||
			    iparts[i].systid == SUNIXOS2)) {
				break;
			}
		}

		/*
		 * no active solaris part.,*try to get the first solaris part.
		 */
		if (i >= TOTAL_NUMPART) {
			for (i = 0; i < TOTAL_NUMPART; i++) {
				if (iparts[i].systid == SUNIXOS ||
				    iparts[i].systid == SUNIXOS2) {
					break;
				}
			}
		}

		if (i < TOTAL_NUMPART) {
		/* we found a solaris partition to use */
			char	part_name[MAXPATHLEN];

			if (conv_flag) {
			/* convert part. name (e.g. c0d0p1) */
				(void) snprintf(part_name, sizeof (part_name),
				    "%s%d", pname, i+1);
			} else {
				(void) snprintf(part_name, sizeof (part_name),
				    "%d", i+1);
			}

			/* the media name comes from the slice desc. */
			partitions[0] = cache_get_desc(DM_PARTITION,
			    desc->p.disk, part_name, desc->secondary_name,
			    errp);
			if (*errp != 0) {
				cache_free_descriptors(partitions);
				return (NULL);
			}
			partitions[1] = NULL;

			return (partitions);
		}

		return (libdiskmgt_empty_desc_array(errp));
	}

	/* Must be for media, so get all the parts. */

	pos = 0;
	for (i = 0; i < TOTAL_NUMPART; i++) {
		if (iparts[i].systid != UNUSED) {
			char	part_name[MAXPATHLEN];

			/*
			 * Process the descriptors and modify the cxdxpx
			 * format so that it refers to the fdisk partition
			 * number and not to the physical disk. This is
			 * achieved by i+1, where i is the number of the
			 * physical disk partition.
			 */
			if (conv_flag) {
				/* convert part. name (e.g. c0d0p1) */
				(void) snprintf(part_name, sizeof (part_name),
				    "%s%d", pname, i+1);
			} else {
				(void) snprintf(part_name, sizeof (part_name),
				    "%d", i+1);
			}

			/* the media name comes from the media desc. */
			partitions[pos] = cache_get_desc(DM_PARTITION,
			    desc->p.disk, part_name, desc->name, errp);
			if (*errp != 0) {
				cache_free_descriptors(partitions);
				return (NULL);
			}

			pos++;
		}
	}
	partitions[pos] = NULL;

	*errp = 0;
	return (partitions);
}

nvlist_t *
partition_get_attributes(descriptor_t *dp, int *errp)
{
	nvlist_t	*attrs = NULL;
	struct ipart	iparts[TOTAL_NUMPART];

	if (!desc_ok(dp)) {
		*errp = ENODEV;
		return (NULL);
	}

	if ((*errp = get_parts(dp->p.disk, iparts, NULL, 0)) != 0) {
		return (NULL);
	}

	if (nvlist_alloc(&attrs, NVATTRS, 0) != 0) {
		*errp = ENOMEM;
		return (NULL);
	}

	if ((*errp = get_attrs(dp, iparts, attrs)) != 0) {
		nvlist_free(attrs);
		attrs = NULL;
	}

	return (attrs);
}

/*
 * Look for the partition by the partition number (which is not too useful).
 */
descriptor_t *
partition_get_descriptor_by_name(char *name, int *errp)
{
	descriptor_t	**partitions;
	int		i;
	descriptor_t	*partition = NULL;

	partitions = cache_get_descriptors(DM_PARTITION, errp);
	if (*errp != 0) {
		return (NULL);
	}

	for (i = 0; partitions[i]; i++) {
		if (libdiskmgt_str_eq(name, partitions[i]->name)) {
			partition = partitions[i];
		} else {
			/* clean up the unused descriptors */
			cache_free_descriptor(partitions[i]);
		}
	}
	free(partitions);

	if (partition == NULL) {
		*errp = ENODEV;
	}

	return (partition);
}

/* ARGSUSED */
descriptor_t **
partition_get_descriptors(int filter[], int *errp)
{
	return (cache_get_descriptors(DM_PARTITION, errp));
}

char *
partition_get_name(descriptor_t *desc)
{
	return (desc->name);
}

/* ARGSUSED */
nvlist_t *
partition_get_stats(descriptor_t *dp, int stat_type, int *errp)
{
	/* There are no stat types defined for partitions */
	*errp = EINVAL;
	return (NULL);
}

/* ARGSUSED */
int
partition_has_fdisk(disk_t *dp, int fd)
{
	char		bootsect[512 * 3]; /* 3 sectors to be safe */

#ifdef sparc
	if (dp->drv_type == DM_DT_FIXED) {
		/* on sparc, only removable media can have fdisk parts. */
		return (0);
	}
#endif

	/*
	 * We assume the caller already made sure media was inserted and
	 * spun up.
	 */

	if ((ioctl(fd, DKIOCGMBOOT, bootsect) < 0) && (errno != ENOTTY)) {
		return (0);
	}

	return (1);
}

/*
 * partition_make_descriptors
 *
 * A partition descriptor points to a disk, the name is the partition number
 * and the secondary name is the media name. The iparts parameter returned
 * by the get_parts function contains the structures of all of the identified
 * partitions found on each disk on a system. These are processed into an array
 * of descriptors. A descriptor contains all of the information about a
 * specific partition.
 *
 * Parameters:  none
 *
 * Returns:     0 on success
 *              Error value on failure
 *
 */

int
partition_make_descriptors()
{
	int		error;
	disk_t		*dp;

	dp = cache_get_disklist();
	while (dp != NULL) {
		struct ipart	iparts[TOTAL_NUMPART];
		char		pname[MAXPATHLEN];

		if (get_parts(dp, iparts, pname, sizeof (pname)) == 0) {
			int	i;
			char	mname[MAXPATHLEN];
			int	conv_flag = 0;
#if defined(i386) || defined(__amd64)
			/* convert part. name (e.g. c0d0p1) */
			int	len;

			len = strlen(pname);
			if (len > 1 && *(pname + (len - 2)) == 'p') {
				conv_flag = 1;
				*(pname + (len - 1)) = 0;
			}
#endif

			mname[0] = 0;
			(void) media_read_name(dp, mname, sizeof (mname));

			/*
			 * Process the descriptors and modify the cxdxpx
			 * format so that it refers to the fdisk partition
			 * number and not to the physical disk. This is
			 * achieved by i+1, where i is the number of the
			 * physical disk partition.
			 */
			for (i = 0; i < TOTAL_NUMPART; i++) {
				if (iparts[i].systid != UNUSED) {
					char    part_name[MAXPATHLEN];

					if (conv_flag) {
						/*
						 * convert partition name
						 * (e.g. c0d0p1)
						 */
						(void) snprintf(part_name,
						    sizeof (part_name),
						    "%s%d", pname, i+1);
					} else {
						(void) snprintf(part_name,
						    sizeof (part_name),
						    "%d", i+1);
					}

					cache_load_desc(DM_PARTITION, dp,
					    part_name, mname, &error);
					if (error != 0) {
						return (error);
					}
				}
			}
		}
		dp = dp->next;
	}

	return (0);
}

static int
get_attrs(descriptor_t *dp, struct ipart *iparts, nvlist_t *attrs)
{
	char		*p;
	int		part_num;

	/*
	 * We already made sure the media was loaded and ready in the
	 * get_parts call within partition_get_attributes.
	 */

	p = strrchr(dp->name, 'p');
	if (p == NULL) {
		p = dp->name;
	} else {
		p++;
	}
	part_num = atoi(p);
	if (part_num > TOTAL_NUMPART ||
	    iparts[part_num - 1].systid == UNUSED) {
		return (ENODEV);
	}

	/*
	 * A partition has been found. Determine what type of
	 * partition it is: logical, extended, or primary.
	 * Collect the information for the partition.
	 */
#if defined(i386) || defined(__amd64)
	if (part_num > FD_NUMPART) {
		if (nvlist_add_uint32(attrs, DM_PARTITION_TYPE,
		    DM_LOGICAL) != 0)  {
			return (ENOMEM);
		}
	} else if (fdisk_is_dos_extended(iparts[part_num - 1].systid)) {
		if (nvlist_add_uint32(attrs, DM_PARTITION_TYPE,
		    DM_EXTENDED) != 0)  {
			return (ENOMEM);
		}

	} else {
		if (nvlist_add_uint32(attrs, DM_PARTITION_TYPE,
		    DM_PRIMARY) != 0) {
			return (ENOMEM);
		}
	}
#endif

#ifdef sparc
	if (nvlist_add_uint32(attrs, DM_PARTITION_TYPE,
	    DM_PRIMARY) != 0) {
		return (ENOMEM);
	}
#endif


	if (nvlist_add_uint32(attrs, DM_BOOTID,
	    (unsigned int)iparts[part_num - 1].bootid) != 0) {
		return (ENOMEM);
	}

	if (nvlist_add_uint32(attrs, DM_PTYPE,
	    (unsigned int)iparts[part_num - 1].systid) != 0) {
		return (ENOMEM);
	}

	if (nvlist_add_uint32(attrs, DM_BHEAD,
	    (unsigned int)iparts[part_num - 1].beghead) != 0) {
		return (ENOMEM);
	}

	if (nvlist_add_uint32(attrs, DM_BSECT,
	    (unsigned int)((iparts[part_num - 1].begsect) & 0x3f)) != 0) {
		return (ENOMEM);
	}

	if (nvlist_add_uint32(attrs, DM_BCYL, (unsigned int)
	    ((iparts[part_num - 1].begcyl & 0xff) |
	    ((iparts[part_num - 1].begsect & 0xc0) << 2))) != 0) {
		return (ENOMEM);
	}

	if (nvlist_add_uint32(attrs, DM_EHEAD,
	    (unsigned int)iparts[part_num - 1].endhead) != 0) {
		return (ENOMEM);
	}

	if (nvlist_add_uint32(attrs, DM_ESECT,
	    (unsigned int)((iparts[part_num - 1].endsect) & 0x3f)) != 0) {
		return (ENOMEM);
	}

	if (nvlist_add_uint32(attrs, DM_ECYL, (unsigned int)
	    ((iparts[part_num - 1].endcyl & 0xff) |
	    ((iparts[part_num - 1].endsect & 0xc0) << 2))) != 0) {
		return (ENOMEM);
	}

	if (nvlist_add_uint32(attrs, DM_RELSECT,
	    (unsigned int)iparts[part_num - 1].relsect) != 0) {
		return (ENOMEM);
	}

	if (nvlist_add_uint32(attrs, DM_NSECTORS,
	    (unsigned int)iparts[part_num - 1].numsect) != 0) {
		return (ENOMEM);
	}

	return (0);
}

/*
 * get_parts
 * Discovers the primary, extended, and logical partitions that have
 * been created on a disk. get_parts loops through the partitions,
 * collects the information on each partition and stores it in a
 * partition table.
 *
 * Parameters;
 *		disk		-The disk device to be evaluated for partitions
 *		iparts		-The structure that holds information about
 *				 the partitions
 *		opath		-The device path
 *		opath_len 	-Buffer size used with opath
 * Returns:
 *		0 on Successful completion
 *		Error Value on failure
 *
 */
static int
get_parts(disk_t *disk, struct ipart *iparts, char *opath, int opath_len)
{
	int		fd;
	struct dk_minfo	minfo;
	struct mboot	bootblk;
	char		bootsect[512];
	int		i;

#if defined(i386) || defined(__amd64)
	int 		j, ret;
	ext_part_t	*epp;		/* extended partition structure */
	char 		*device;	/* name of fixed disk drive */
	size_t 		len;
	logical_drive_t	*log_drv;	/* logical drive structure */
	uint64_t 	tmpsect;
#endif

	/* Can't use drive_open_disk since we need the partition dev name. */
	if ((fd = open_disk(disk, opath, opath_len)) < 0) {
		return (ENODEV);
	}

	/* First make sure media is inserted and spun up. */
	if (!media_read_info(fd, &minfo)) {
		(void) close(fd);
		return (ENODEV);
	}

	if (!partition_has_fdisk(disk, fd)) {
		(void) close(fd);
		return (ENOTTY);
	}

	if (lseek(fd, 0, 0) == -1) {
		(void) close(fd);
		return (ENODEV);
	}

	if (read(fd, bootsect, 512) != 512) {
		(void) close(fd);
		return (ENODEV);
	}
	(void) close(fd);

	(void) memcpy(&bootblk, bootsect, sizeof (bootblk));

	if (les(bootblk.signature) != MBB_MAGIC)  {
		return (ENOTTY);
	}

	/*
	 * Initialize the memory space to clear unknown garbage
	 * that might create confusing results.
	 */
	for (i = 0;  i < TOTAL_NUMPART; i++) {
		(void) memset(&iparts[i], 0, sizeof (struct ipart));
		iparts[i].systid = UNUSED;
	}

	(void) memcpy(iparts, bootblk.parts, ISIZE);

	/*
	 * Check to see if a valid partition exists. If a valid partition
	 * exists, check to see if it is an extended partition.
	 * If an extended partition exists, collect the logical partition
	 * data.
	 */
	for (i = 0; i < FD_NUMPART; i++) {
		if (iparts[i].systid == UNUSED)
			continue;

		iparts[i].relsect = lel(iparts[i].relsect);
		iparts[i].numsect = lel(iparts[i].numsect);

#if defined(i386) || defined(__amd64)
		if (!fdisk_is_dos_extended(iparts[i].systid))
			continue;

		len = strlen(disk->aliases->alias) + 1;
		if ((device = malloc(len)) == NULL) {
			if (device)
				free(device);
			continue;
		}

		(void) snprintf(device, len, "%s", disk->aliases->alias);

		if ((ret = libfdisk_init(&epp, device, &iparts[i],
		    FDISK_READ_DISK)) != FDISK_SUCCESS) {

			switch (ret) {
				/*
				 * The first 2 error cases indicate that
				 * there is no Solaris logical partition,
				 * which is a valid condition,
				 * so iterating through the disk continues.
				 * Any other error cases indicate there is
				 * a potential problem with the disk, so
				 * don't continue iterating through the disk
				 * and return an error.
				 */
				case FDISK_EBADLOGDRIVE:
				case FDISK_ENOLOGDRIVE:
					free(device);
					libfdisk_fini(&epp);
					continue;
				case FDISK_EBADMAGIC:
					free(device);
					libfdisk_fini(&epp);
					return (ENOTTY);
				default:
					free(device);
					libfdisk_fini(&epp);
					return (ENODEV);
			}
		}

		/*
		 * Collect logical drive information
		 */
		for (log_drv = fdisk_get_ld_head(epp),  j = FD_NUMPART,
		    tmpsect = 0; (j < TOTAL_NUMPART) && (log_drv != NULL);
		    log_drv = log_drv->next, j++) {
			iparts[j].bootid = log_drv->parts[0].bootid;
			iparts[j].beghead = log_drv->parts[0].beghead;
			iparts[j].begsect = log_drv->parts[0].begsect;
			iparts[j].begcyl = log_drv->parts[0].begcyl;
			iparts[j].systid = log_drv->parts[0].systid;
			iparts[j].endhead = log_drv->parts[0].endhead;
			iparts[j].endsect = log_drv->parts[0].endsect;
			iparts[j].endcyl = log_drv->parts[0].endcyl;
			iparts[j].relsect = (tmpsect +
			    lel(log_drv->parts[0].relsect) + epp->ext_beg_sec);
			iparts[j].numsect = lel(log_drv->parts[0].numsect);
			tmpsect = lel(log_drv->parts[1].relsect);
		}

		/* free the device and the epp memory. */
		free(device);
		libfdisk_fini(&epp);
#endif
	}

	return (0);
}

/* return 1 if the partition descriptor is still valid, 0 if not. */
static int
desc_ok(descriptor_t *dp)
{
	/* First verify the media name for removable media */
	if (dp->p.disk->removable) {
		char	mname[MAXPATHLEN];

		if (!media_read_name(dp->p.disk, mname, sizeof (mname))) {
			return (0);
		}

		if (mname[0] == 0) {
			return (libdiskmgt_str_eq(dp->secondary_name, NULL));
		} else {
			return (libdiskmgt_str_eq(dp->secondary_name, mname));
		}
	}

	/*
	 * We could verify the partition is still there but this is kind of
	 * expensive and other code down the line will do that (e.g. see
	 * get_attrs).
	 */

	return (1);
}

/*
 * Return 1 if partition has slices, 0 if not.
 */
static int
has_slices(descriptor_t *desc, int *errp)
{
	int		pnum;
	int		i;
	char		*p;
	struct ipart	iparts[TOTAL_NUMPART];

	if (get_parts(desc->p.disk, iparts, NULL, 0) != 0) {
		*errp = ENODEV;
		return (0);
	}

	p = strrchr(desc->name, 'p');
	if (p == NULL) {
		p = desc->name;
	} else {
		p++;
	}
	pnum = atoi(p);

	/*
	 * Slices are associated with the active solaris partition or if there
	 * is no active solaris partition, then the first solaris partition.
	 */

	*errp = 0;
	if (iparts[pnum].bootid == ACTIVE &&
	    (iparts[pnum].systid == SUNIXOS ||
	    iparts[pnum].systid == SUNIXOS2)) {
		return (1);
	} else {
		int	active = 0;

		/* Check if there are no active solaris partitions. */
		for (i = 0; i < TOTAL_NUMPART; i++) {
			if (iparts[i].bootid == ACTIVE &&
			    (iparts[i].systid == SUNIXOS ||
			    iparts[i].systid == SUNIXOS2)) {
				active = 1;
				break;
			}
		}

		if (!active) {
			/* Check if this is the first solaris partition. */
			for (i = 0; i < TOTAL_NUMPART; i++) {
				if (iparts[i].systid == SUNIXOS ||
				    iparts[i].systid == SUNIXOS2) {
					break;
				}
			}

			if (i < TOTAL_NUMPART && i == pnum) {
				return (1);
			}
		}
	}

	return (0);
}

static int
open_disk(disk_t *diskp, char *opath, int len)
{
	/*
	 * Just open the first devpath.
	 */
	if (diskp->aliases != NULL && diskp->aliases->devpaths != NULL) {
#ifdef sparc
	if (opath != NULL) {
		(void) strlcpy(opath, diskp->aliases->devpaths->devpath, len);
	}
	return (open(diskp->aliases->devpaths->devpath, O_RDONLY|O_NDELAY));
#else
	/* On intel we need to open partition device (e.g. c0d0p1). */
	char	part_dev[MAXPATHLEN];
	char	*p;

	(void) strlcpy(part_dev, diskp->aliases->devpaths->devpath,
	    sizeof (part_dev));
	p = strrchr(part_dev, '/');
	if (p == NULL) {
		p = strrchr(part_dev, 's');
		if (p != NULL) {
			*p = 'p';
		}
	} else {
		char *ps;

		*p = 0;
		ps = strrchr((p + 1), 's');
		if (ps != NULL) {
			*ps = 'p';
		}
		*p = '/';
	}

	if (opath != NULL) {
		(void) strlcpy(opath, part_dev, len);
	}
	return (open(part_dev, O_RDONLY|O_NDELAY));
#endif
	}

	return (-1);
}