1 files changed, 963 insertions, 0 deletions

diff --git a/libblkid/libfdisk/src/partition.c b/libblkid/libfdisk/src/partition.c
new file mode 100644
index 000000000..8f8402716
--- /dev/null
+++ b/libblkid/libfdisk/src/partition.c
@@ -0,0 +1,963 @@
+
+#include "c.h"
+#include "strutils.h"
+
+#include "fdiskP.h"
+
+/**
+ * SECTION: partition
+ * @title: Partition
+ * @short_description: generic label independent partition abstraction
+ *
+ * The fdisk_partition provides label independent abstraction. The partitions
+ * are not directly connected with partition table (label) data. Any change to
+ * fdisk_partition does not affects in-memory or on-disk label data.
+ *
+ * The fdisk_partition is possible to use as a template for
+ * fdisk_add_partition() or fdisk_set_partition() operations.
+ */
+
+static void init_partition(struct fdisk_partition *pa)
+{
+	FDISK_INIT_UNDEF(pa->size);
+	FDISK_INIT_UNDEF(pa->start);
+	FDISK_INIT_UNDEF(pa->partno);
+	FDISK_INIT_UNDEF(pa->parent_partno);
+	FDISK_INIT_UNDEF(pa->boot);
+
+	INIT_LIST_HEAD(&pa->parts);
+}
+
+/**
+ * fdisk_new_partition:
+ *
+ * Returns: new instance.
+ */
+struct fdisk_partition *fdisk_new_partition(void)
+{
+	struct fdisk_partition *pa = calloc(1, sizeof(*pa));
+
+	pa->refcount = 1;
+	init_partition(pa);
+	DBG(PART, ul_debugobj(pa, "alloc"));
+	return pa;
+}
+
+/**
+ * fdisk_reset_partition:
+ * @pa: partition
+ *
+ * Resets partition content.
+ */
+void fdisk_reset_partition(struct fdisk_partition *pa)
+{
+	int ref;
+
+	if (!pa)
+		return;
+
+	DBG(PART, ul_debugobj(pa, "reset"));
+	ref = pa->refcount;
+
+	fdisk_unref_parttype(pa->type);
+	free(pa->name);
+	free(pa->uuid);
+	free(pa->attrs);
+
+	memset(pa, 0, sizeof(*pa));
+	pa->refcount = ref;
+
+	init_partition(pa);
+}
+
+/**
+ * fdisk_ref_partition:
+ * @pa: partition pointer
+ *
+ * Incremparts reference counter.
+ */
+void fdisk_ref_partition(struct fdisk_partition *pa)
+{
+	if (pa)
+		pa->refcount++;
+}
+
+/**
+ * fdisk_unref_partition:
+ * @pa: partition pointer
+ *
+ * De-incremparts reference counter, on zero the @pa is automatically
+ * deallocated.
+ */
+void fdisk_unref_partition(struct fdisk_partition *pa)
+{
+	if (!pa)
+		return;
+
+	pa->refcount--;
+	if (pa->refcount <= 0) {
+		fdisk_reset_partition(pa);
+		list_del(&pa->parts);
+		DBG(PART, ul_debugobj(pa, "free"));
+		free(pa);
+	}
+}
+
+/**
+ * fdisk_partition_set_start:
+ * @pa: partition
+ * @off: offset in sectors, maximal is UINT64_MAX-1
+ *
+ * Note that zero is valid offset too. Use fdisk_partition_unset_start() to
+ * undefine the offset. 
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int fdisk_partition_set_start(struct fdisk_partition *pa, fdisk_sector_t off)
+{
+	if (!pa)
+		return -EINVAL;
+	if (FDISK_IS_UNDEF(off))
+		return -ERANGE;
+	pa->start = off;
+	return 0;
+}
+
+/**
+ * fdisk_partition_unset_start:
+ * @pa: partition
+ *
+ * Sets the size as undefined. See fdisk_partition_has_start().
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int fdisk_partition_unset_start(struct fdisk_partition *pa)
+{
+	if (!pa)
+		return -EINVAL;
+	FDISK_INIT_UNDEF(pa->start);
+	return 0;
+}
+
+/**
+ * fdisk_partition_get_start:
+ * @pa: partition
+ *
+ * The zero is also valid offset. The function may return random undefined
+ * value when start offset is undefined (for example after
+ * fdisk_partition_unset_start()). Always use fdisk_partition_has_start() to be
+ * sure that you work with valid numbers.
+ *
+ * Returns: start offset in sectors
+ */
+fdisk_sector_t fdisk_partition_get_start(struct fdisk_partition *pa)
+{
+	return pa->start;
+}
+
+/**
+ * fdisk_partition_has_start:
+ * @pa: partition
+ *
+ * Returns: 1 or 0
+ */
+int fdisk_partition_has_start(struct fdisk_partition *pa)
+{
+	return pa && !FDISK_IS_UNDEF(pa->start);
+}
+
+
+/**
+ * fdisk_partition_cmp_start:
+ * @a: partition
+ * @b: partition
+ *
+ * Compares partitons according to start offset, See fdisk_sort_table().
+ *
+ * Return: 0 if the same, <0 if @b greater, >0 if @a greater.
+ */
+int fdisk_partition_cmp_start(struct fdisk_partition *a,
+			      struct fdisk_partition *b)
+{
+	int no_a = FDISK_IS_UNDEF(a->start),
+	    no_b = FDISK_IS_UNDEF(b->start);
+
+	if (no_a && no_b)
+		return 0;
+	if (no_a)
+		return -1;
+	if (no_b)
+		return 1;
+
+	return cmp_numbers(a->start, b->start);
+}
+
+/**
+ * fdisk_partition_start_follow_default
+ * @pa: partition
+ * @enable: 0|1
+ *
+ * When @pa used as a tempalate for fdisk_add_partition() when force label driver
+ * to use the first possible space for the new partition.
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int fdisk_partition_start_follow_default(struct fdisk_partition *pa, int enable)
+{
+	if (!pa)
+		return -EINVAL;
+	pa->start_follow_default = enable ? 1 : 0;
+	return 0;
+}
+
+/**
+ * fdisk_partition_start_is_default:
+ * @pa: partition
+ *
+ * See fdisk_partition_start_follow_default().
+ *
+ * Returns: 1 if the partition follows default
+ */
+int fdisk_partition_start_is_default(struct fdisk_partition *pa)
+{
+	assert(pa);
+	return pa->start_follow_default;
+}
+
+
+/**
+ * fdisk_partition_set_size:
+ * @pa: partition
+ * @sz: size in sectors, maximal is UIN64_MAX-1
+ *
+ * Note that zero is valid size too. Use fdisk_partition_unset_size() to
+ * undefine the size.
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int fdisk_partition_set_size(struct fdisk_partition *pa, fdisk_sector_t sz)
+{
+	if (!pa)
+		return -EINVAL;
+	if (FDISK_IS_UNDEF(sz))
+		return -ERANGE;
+	pa->size = sz;
+	return 0;
+}
+
+/**
+ * fdisk_partition_unset_size:
+ * @pa: partition
+ *
+ * Sets the size as undefined. See fdisk_partition_has_size().
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int fdisk_partition_unset_size(struct fdisk_partition *pa)
+{
+	if (!pa)
+		return -EINVAL;
+	FDISK_INIT_UNDEF(pa->size);
+	return 0;
+}
+
+/**
+ * fdisk_partition_get_size:
+ * @pa: partition
+ *
+ * The zero is also valid size. The function may return random undefined
+ * value when size is undefined (for example after fdisk_partition_unset_size()).
+ * Always use fdisk_partition_has_size() to be sure that you work with valid 
+ * numbers.
+ *
+ * Returns: size offset in sectors
+ */
+fdisk_sector_t fdisk_partition_get_size(struct fdisk_partition *pa)
+{
+	return pa->size;
+}
+
+/**
+ * fdisk_partition_has_size:
+ * @pa: partition
+ *
+ * Returns: 1 or 0
+ */
+int fdisk_partition_has_size(struct fdisk_partition *pa)
+{
+	return pa && !FDISK_IS_UNDEF(pa->size);
+}
+
+/**
+ * fdisk_partition_size_explicit:
+ * @pa: partition
+ * @enable: 0|1
+ *
+ * By default libfdisk aligns the size when add the new partition (by
+ * fdisk_add_partrition()). If you want to disable this functionality use
+ * @enable = 1.
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int fdisk_partition_size_explicit(struct fdisk_partition *pa, int enable)
+{
+	if (!pa)
+		return -EINVAL;
+	pa->size_explicit = enable ? 1 : 0;
+	return 0;
+}
+
+/**
+ * fdisk_partition_set_partno:
+ * @pa: partition
+ * @num: partitin number (0 is the first partition, maximal is SIZE_MAX-1)
+ *
+ * Note that zero is valid partno too. Use fdisk_partition_unset_partno() to
+ * undefine the partno.
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int fdisk_partition_set_partno(struct fdisk_partition *pa, size_t num)
+{
+	if (!pa)
+		return -EINVAL;
+	if (FDISK_IS_UNDEF(num))
+		return -ERANGE;
+	pa->partno = num;
+	return 0;
+}
+
+/**
+ * fdisk_partition_unset_partno:
+ * @pa: partition
+ *
+ * Sets the partno as undefined. See fdisk_partition_has_partno().
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int fdisk_partition_unset_partno(struct fdisk_partition *pa)
+{
+	if (!pa)
+		return -EINVAL;
+	FDISK_INIT_UNDEF(pa->partno);
+	return 0;
+}
+
+/**
+ * fdisk_partition_get_partno:
+ * @pa: partition
+ *
+ * The zero is also valid parition number. The function may return random
+ * value when partno is undefined (for example after fdisk_partition_unset_partno()).
+ * Always use fdisk_partition_has_partno() to be sure that you work with valid
+ * numbers.
+ *
+ * Returns: partition number (0 is the first partition)
+ */
+size_t fdisk_partition_get_partno(struct fdisk_partition *pa)
+{
+	return pa->partno;
+}
+
+/**
+ * fdisk_partition_has_partno:
+ * @pa: partition
+ *
+ * Returns: 1 or 0
+ */
+int fdisk_partition_has_partno(struct fdisk_partition *pa)
+{
+	return pa && !FDISK_IS_UNDEF(pa->partno);
+}
+
+
+/**
+ * fdisk_partition_cmp_partno:
+ * @a: partition
+ * @b: partition
+ *
+ * Compares partitons according to partition number See fdisk_sort_table().
+ *
+ * Return: 0 if the same, <0 if @b greater, >0 if @a greater.
+ */
+int fdisk_partition_cmp_partno(struct fdisk_partition *a,
+			       struct fdisk_partition *b)
+{
+	return a->partno - b->partno;
+}
+
+/**
+ * fdisk_partition_partno_follow_default
+ * @pa: partition
+ * @enable: 0|1
+ *
+ * When @pa used as a tempalate for fdisk_add_partition() when force label driver
+ * to add a new partition to the default (next) position.
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int fdisk_partition_partno_follow_default(struct fdisk_partition *pa, int enable)
+{
+	if (!pa)
+		return -EINVAL;
+	pa->partno_follow_default = enable ? 1 : 0;
+	return 0;
+}
+
+/**
+ * fdisk_partition_set_type:
+ * @pa: partition
+ * @type: partition type
+ *
+ * Sets parition type.
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int fdisk_partition_set_type(struct fdisk_partition *pa,
+			     struct fdisk_parttype *type)
+{
+	if (!pa)
+		return -EINVAL;
+
+	fdisk_ref_parttype(type);
+	fdisk_unref_parttype(pa->type);
+	pa->type = type;
+
+	return 0;
+}
+
+/**
+ * fdisk_partition_get_type:
+ * @pa: partition
+ *
+ * Returns: pointer to partition type.
+ */
+struct fdisk_parttype *fdisk_partition_get_type(struct fdisk_partition *pa)
+{
+	return pa ? pa->type : NULL;
+}
+
+int fdisk_partition_set_name(struct fdisk_partition *pa, const char *name)
+{
+	char *p = NULL;
+
+	if (!pa)
+		return -EINVAL;
+	if (name) {
+	       p = strdup(name);
+	       if (!p)
+		       return -ENOMEM;
+	}
+	free(pa->name);
+	pa->name = p;
+	return 0;
+}
+
+const char *fdisk_partition_get_name(struct fdisk_partition *pa)
+{
+	return pa ? pa->name : NULL;
+}
+
+int fdisk_partition_set_uuid(struct fdisk_partition *pa, const char *uuid)
+{
+	char *p = NULL;
+
+	if (!pa)
+		return -EINVAL;
+	if (uuid) {
+	       p = strdup(uuid);
+	       if (!p)
+		       return -ENOMEM;
+	}
+	free(pa->uuid);
+	pa->uuid = p;
+	return 0;
+}
+
+/**
+ * fdisk_partition_has_end:
+ * @pa: partition
+ *
+ * Returns: 1 if the partition has defined last sector
+ */
+int fdisk_partition_has_end(struct fdisk_partition *pa)
+{
+	return pa && !FDISK_IS_UNDEF(pa->start) && !FDISK_IS_UNDEF(pa->size);
+}
+
+/**
+ * fdisk_partition_get_end:
+ * @pa: partition
+ *
+ * This function may returns absolute non-sense, always check
+ * fdisk_partition_has_end().
+ *
+ * Note that partition end is defined by fdisk_partition_set_start() and
+ * fdisk_partition_set_size().
+ *
+ * Returns: last partition sector LBA.
+ */
+fdisk_sector_t fdisk_partition_get_end(struct fdisk_partition *pa)
+{
+	return pa->start + pa->size - (pa->size == 0 ? 0 : 1);
+}
+
+/**
+ * fdisk_partition_end_follow_default
+ * @pa: partition
+ * @enable: 0|1
+ *
+ * When @pa used as a tempalate for fdisk_add_partition() when force label driver
+ * to use all the possible space for the new partition.
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int fdisk_partition_end_follow_default(struct fdisk_partition *pa, int enable)
+{
+	if (!pa)
+		return -EINVAL;
+	pa->end_follow_default = enable ? 1 : 0;
+	return 0;
+}
+
+/**
+ * fdisk_partition_end_is_default:
+ * @pa: partition
+ *
+ * Returns: 1 if the partition follows default
+ */
+int fdisk_partition_end_is_default(struct fdisk_partition *pa)
+{
+	assert(pa);
+	return pa->end_follow_default;
+}
+
+const char *fdisk_partition_get_uuid(struct fdisk_partition *pa)
+{
+	return pa ? pa->uuid : NULL;
+}
+
+const char *fdisk_partition_get_attrs(struct fdisk_partition *pa)
+{
+	return pa ? pa->attrs : NULL;
+}
+
+int fdisk_partition_set_attrs(struct fdisk_partition *pa, const char *attrs)
+{
+	char *p = NULL;
+
+	if (!pa)
+		return -EINVAL;
+	if (attrs) {
+	       p = strdup(attrs);
+	       if (!p)
+		       return -ENOMEM;
+	}
+	free(pa->attrs);
+	pa->attrs = p;
+	return 0;
+}
+
+int fdisk_partition_is_nested(struct fdisk_partition *pa)
+{
+	return pa && !FDISK_IS_UNDEF(pa->parent_partno);
+}
+
+int fdisk_partition_is_container(struct fdisk_partition *pa)
+{
+	return pa && pa->container;
+}
+
+int fdisk_partition_get_parent(struct fdisk_partition *pa, size_t *parent)
+{
+	if (pa && parent)
+		*parent = pa->parent_partno;
+	else
+		return -EINVAL;
+	return 0;
+}
+
+int fdisk_partition_is_used(struct fdisk_partition *pa)
+{
+	return pa && pa->used;
+}
+
+int fdisk_partition_is_bootable(struct fdisk_partition *pa)
+{
+	return pa && pa->boot == 1;
+}
+
+int fdisk_partition_is_freespace(struct fdisk_partition *pa)
+{
+	return pa && pa->freespace;
+}
+
+int fdisk_partition_next_partno(
+		struct fdisk_partition *pa,
+		struct fdisk_context *cxt,
+		size_t *n)
+{
+	assert(cxt);
+	assert(n);
+
+	if (pa && pa->partno_follow_default) {
+		size_t i;
+
+		DBG(PART, ul_debugobj(pa, "next partno (follow default)"));
+
+		for (i = 0; i < cxt->label->nparts_max; i++) {
+			if (!fdisk_is_partition_used(cxt, i)) {
+				*n = i;
+				return 0;
+			}
+		}
+		return -ERANGE;
+
+	} else if (pa && fdisk_partition_has_partno(pa)) {
+
+		DBG(PART, ul_debugobj(pa, "next partno (specified=%zu)", pa->partno));
+
+		if (pa->partno >= cxt->label->nparts_max)
+			return -ERANGE;
+		*n = pa->partno;
+	} else
+		return fdisk_ask_partnum(cxt, n, 1);
+
+	return 0;
+}
+
+/**
+ * fdisk_partition_to_string:
+ * @pa: partition
+ * @cxt: context
+ * @id: field (FDISK_FIELD_*)
+ * @data: returns string with allocated data
+ *
+ * Returns info about partition converted to printable string.
+ *
+ * For example
+ * <informalexample>
+ *   <programlisting>
+ *      struct fdisk_parition *pa;
+ *
+ *      fdisk_get_partition(cxt, 0, &pa);
+ *	fdisk_partition_to_string(pa, FDISK_FIELD_UUID, &data);
+ *	printf("first partition uuid: %s\n", data);
+ *	free(data);
+ *	fdisk_unref_partition(pa);
+ *   </programlisting>
+ * </informalexample>
+ *
+ * returns UUID for the first partition.
+ *
+ * Returns: 0 on success, otherwise, a corresponding error.
+ */
+int fdisk_partition_to_string(struct fdisk_partition *pa,
+			      struct fdisk_context *cxt,
+			      int id,
+			      char **data)
+{
+	char *p = NULL;
+	int rc = 0;
+	uint64_t x;
+
+	if (!pa || !cxt)
+		return -EINVAL;
+
+	switch (id) {
+	case FDISK_FIELD_DEVICE:
+		if (pa->freespace)
+			p = strdup(_("Free space"));
+		else if (fdisk_partition_has_partno(pa) && cxt->dev_path) {
+			if (cxt->label->flags & FDISK_LABEL_FL_INCHARS_PARTNO)
+				rc = asprintf(&p, "%c", (int) pa->partno + 'a');
+			else
+				p = fdisk_partname(cxt->dev_path, pa->partno + 1);
+		}
+		break;
+	case FDISK_FIELD_BOOT:
+		if (fdisk_partition_is_bootable(pa))
+			rc = asprintf(&p, "%c", pa->boot ? '*' : ' ');
+		break;
+	case FDISK_FIELD_START:
+		if (fdisk_partition_has_start(pa)) {
+			x = fdisk_cround(cxt, pa->start);
+			rc = pa->start_post ?
+				asprintf(&p, "%ju%c", x, pa->start_post) :
+				asprintf(&p, "%ju", x);
+		}
+		break;
+	case FDISK_FIELD_END:
+		if (fdisk_partition_has_end(pa)) {
+			x = fdisk_cround(cxt, fdisk_partition_get_end(pa));
+			rc = pa->end_post ?
+					asprintf(&p, "%ju%c", x, pa->end_post) :
+					asprintf(&p, "%ju", x);
+		}
+		break;
+	case FDISK_FIELD_SIZE:
+		if (fdisk_partition_has_size(pa)) {
+			uint64_t sz = pa->size * cxt->sector_size;
+
+			if (fdisk_is_details(cxt)) {
+				rc = pa->size_post ?
+						asprintf(&p, "%ju%c", sz, pa->size_post) :
+						asprintf(&p, "%ju", sz);
+			} else {
+				p = size_to_human_string(SIZE_SUFFIX_1LETTER, sz);
+				if (!p)
+					rc = -ENOMEM;
+			}
+		}
+		break;
+	case FDISK_FIELD_CYLINDERS:
+		rc = asprintf(&p, "%ju", (uintmax_t)
+			fdisk_cround(cxt, fdisk_partition_has_size(pa) ? pa->size : 0));
+		break;
+	case FDISK_FIELD_SECTORS:
+		rc = asprintf(&p, "%ju",
+			fdisk_partition_has_size(pa) ? (uintmax_t) pa->size : 0);
+		break;
+	case FDISK_FIELD_BSIZE:
+		rc = asprintf(&p, "%ju", pa->bsize);
+		break;
+	case FDISK_FIELD_FSIZE:
+		rc = asprintf(&p, "%ju", pa->fsize);
+		break;
+	case FDISK_FIELD_CPG:
+		rc = asprintf(&p, "%ju", pa->cpg);
+		break;
+	case FDISK_FIELD_TYPE:
+		p = pa->type && pa->type->name ? strdup(pa->type->name) : NULL;
+		break;
+	case FDISK_FIELD_TYPEID:
+		if (pa->type && fdisk_parttype_get_string(pa->type))
+			rc = asprintf(&p, "%s", fdisk_parttype_get_string(pa->type));
+		else if (pa->type)
+			rc = asprintf(&p, "%x", fdisk_parttype_get_code(pa->type));
+		break;
+	case FDISK_FIELD_UUID:
+		p = pa->uuid ? strdup(pa->uuid) : NULL;
+		break;
+	case FDISK_FIELD_NAME:
+		p = pa->name ? strdup(pa->name) : NULL;
+		break;
+	case FDISK_FIELD_ATTR:
+		p = pa->attrs ? strdup(pa->attrs) : NULL;
+		break;
+	case FDISK_FIELD_SADDR:
+		p = pa->start_chs ? strdup(pa->start_chs) : NULL;
+		break;
+	case FDISK_FIELD_EADDR:
+		p = pa->end_chs ? strdup(pa->end_chs) : NULL;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (rc < 0)
+		rc = -ENOMEM;
+	else if (rc > 0)
+		rc = 0;
+
+	if (data)
+		*data = p;
+	return rc;
+}
+
+/**
+ * fdisk_get_partition:
+ * @cxt: context
+ * @partno: partition number (0 is the first partition)
+ * @pa: returns data about partition
+ *
+ * Reads disklabel and fills in @pa with data about partition @n.
+ *
+ * Note that partno may address unused partition and then this function does
+ * not fill anything to @pa.  See fdisk_is_partition_used(). If @pa points to
+ * NULL then the function allocates a newly allocated fdisk_partition struct,
+ * use fdisk_unref_partition() to deallocate.
+ *
+ * Returns: 0 on success, otherwise, a corresponding error.
+ */
+int fdisk_get_partition(struct fdisk_context *cxt, size_t partno,
+			struct fdisk_partition **pa)
+{
+	int rc;
+	struct fdisk_partition *np = NULL;
+
+	if (!cxt || !cxt->label || !pa)
+		return -EINVAL;
+	if (!cxt->label->op->get_part)
+		return -ENOSYS;
+	if (!fdisk_is_partition_used(cxt, partno))
+		return -EINVAL;
+
+	if (!*pa) {
+		np = *pa = fdisk_new_partition();
+		if (!*pa)
+			return -ENOMEM;
+	} else
+		fdisk_reset_partition(*pa);
+
+	(*pa)->partno = partno;
+	rc = cxt->label->op->get_part(cxt, partno, *pa);
+
+	if (rc) {
+		if (np) {
+			fdisk_unref_partition(np);
+			*pa = NULL;
+		} else
+			fdisk_reset_partition(*pa);
+	} else
+		(*pa)->size_explicit = 1;
+	return rc;
+}
+
+/**
+ * fdisk_set_partition:
+ * @cxt: context
+ * @partno: partition number (0 is the first partition)
+ * @pa: new partition setting
+ *
+ * Modifies disklabel according to setting with in @pa.
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int fdisk_set_partition(struct fdisk_context *cxt, size_t partno,
+			struct fdisk_partition *pa)
+{
+	if (!cxt || !cxt->label || !pa)
+		return -EINVAL;
+	if (!cxt->label->op->set_part)
+		return -ENOSYS;
+
+	DBG(CXT, ul_debugobj(cxt, "setting partition %zu %p (start=%ju, end=%ju, size=%ju, "
+		    "defaults(start=%s, end=%s, partno=%s)",
+		    partno, pa,
+		    (uintmax_t) fdisk_partition_get_start(pa),
+		    (uintmax_t) fdisk_partition_get_end(pa),
+		    (uintmax_t) fdisk_partition_get_size(pa),
+		    pa->start_follow_default ? "yes" : "no",
+		    pa->end_follow_default ? "yes" : "no",
+		    pa->partno_follow_default ? "yes" : "no"));
+
+	return cxt->label->op->set_part(cxt, partno, pa);
+}
+
+/**
+ * fdisk_add_partition:
+ * @cxt: fdisk context
+ * @pa: template for the partition (or NULL)
+ * @partno: NULL or returns new partition number
+ *
+ * If @pa is not specified or any @pa item is missiong the libfdisk will ask by
+ * fdisk_ask_ API.
+ *
+ * Adds a new partition to disklabel.
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int fdisk_add_partition(struct fdisk_context *cxt,
+			struct fdisk_partition *pa,
+			size_t *partno)
+{
+	int rc;
+
+	assert(cxt);
+	assert(cxt->label);
+
+	if (!cxt || !cxt->label)
+		return -EINVAL;
+	if (!cxt->label->op->add_part)
+		return -ENOSYS;
+	if (fdisk_missing_geometry(cxt))
+		return -EINVAL;
+
+	if (pa)
+		DBG(CXT, ul_debugobj(cxt, "adding new partition %p (start=%ju, end=%ju, size=%ju, "
+			    "defaults(start=%s, end=%s, partno=%s)",
+			    pa,
+			    (uintmax_t) fdisk_partition_get_start(pa),
+			    (uintmax_t) fdisk_partition_get_end(pa),
+			    (uintmax_t) fdisk_partition_get_size(pa),
+			    pa->start_follow_default ? "yes" : "no",
+			    pa->end_follow_default ? "yes" : "no",
+			    pa->partno_follow_default ? "yes" : "no"));
+	else
+		DBG(CXT, ul_debugobj(cxt, "adding partition"));
+
+	rc = cxt->label->op->add_part(cxt, pa, partno);
+
+	DBG(CXT, ul_debugobj(cxt, "add partition done (rc=%d)", rc));
+	return rc;
+}
+
+/**
+ * fdisk_delete_partition:
+ * @cxt: fdisk context
+ * @partno: partition number to delete (0 is the first partition)
+ *
+ * Deletes a @partno partition from disklabel.
+ *
+ * Returns: 0 on success, <0 on error
+ */
+int fdisk_delete_partition(struct fdisk_context *cxt, size_t partno)
+{
+	if (!cxt || !cxt->label)
+		return -EINVAL;
+	if (!cxt->label->op->del_part)
+		return -ENOSYS;
+
+	DBG(CXT, ul_debugobj(cxt, "deleting %s partition number %zd",
+				cxt->label->name, partno));
+	return cxt->label->op->del_part(cxt, partno);
+}
+
+/**
+ * fdisk_delete_all_partitions:
+ * @cxt: fdisk context
+ *
+ * Delete all used partitions from disklabel.
+ *
+ * Returns: 0 on success, otherwise, a corresponding error.
+ */
+int fdisk_delete_all_partitions(struct fdisk_context *cxt)
+{
+	size_t i;
+	int rc;
+
+	if (!cxt || !cxt->label)
+		return -EINVAL;
+
+	for (i = 0; i < cxt->label->nparts_max; i++) {
+
+		if (!fdisk_is_partition_used(cxt, i))
+			continue;
+		rc = fdisk_delete_partition(cxt, i);
+		if (rc)
+			break;
+	}
+
+	return rc;
+}
+
+/**
+ * fdisk_is_partition_used:
+ * @cxt: context
+ * @n: partition number (0 is the first partition)
+ *
+ * This is faster than fdisk_get_partition() + fdisk_partition_is_used().
+ *
+ * Returns: 0 or 1
+ */
+int fdisk_is_partition_used(struct fdisk_context *cxt, size_t n)
+{
+	if (!cxt || !cxt->label)
+		return -EINVAL;
+	if (!cxt->label->op->part_is_used)
+		return -ENOSYS;
+
+	return cxt->label->op->part_is_used(cxt, n);
+}
+