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Diffstat (limited to 'libfdisk/src/partition.c')
| -rw-r--r-- | libfdisk/src/partition.c | 1506 |
1 files changed, 1506 insertions, 0 deletions
diff --git a/libfdisk/src/partition.c b/libfdisk/src/partition.c new file mode 100644 index 0000000..ebcf6bf --- /dev/null +++ b/libfdisk/src/partition.c @@ -0,0 +1,1506 @@ + +#include "c.h" +#include "strutils.h" + +#ifdef HAVE_LIBBLKID +# include <blkid.h> +#endif + +#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); + free(pa->fstype); + free(pa->fsuuid); + free(pa->fslabel); + free(pa->start_chs); + free(pa->end_chs); + + memset(pa, 0, sizeof(*pa)); + pa->refcount = ref; + + init_partition(pa); +} + +static struct fdisk_partition *__copy_partition(struct fdisk_partition *o) +{ + struct fdisk_partition *n = fdisk_new_partition(); + + if (!n) + return NULL; + memcpy(n, o, sizeof(*n)); + if (n->type) + fdisk_ref_parttype(n->type); + if (o->name) + n->name = strdup(o->name); + if (o->uuid) + n->uuid = strdup(o->uuid); + if (o->attrs) + n->attrs = strdup(o->attrs); + if (o->fstype) + n->fstype = strdup(o->fstype); + if (o->fsuuid) + n->fsuuid = strdup(o->fsuuid); + if (o->fslabel) + n->fslabel = strdup(o->fslabel); + + return n; +} + +/** + * fdisk_ref_partition: + * @pa: partition pointer + * + * Increments reference counter. + */ +void fdisk_ref_partition(struct fdisk_partition *pa) +{ + if (pa) + pa->refcount++; +} + +/** + * fdisk_unref_partition: + * @pa: partition pointer + * + * Decrements 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) { + list_del(&pa->parts); + fdisk_reset_partition(pa); + 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; + pa->fs_probed = 0; + 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); + pa->fs_probed = 0; + 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 partitions according to start offset, See fdisk_table_sort_partitions(). + * + * 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 template 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; + pa->fs_probed = 0; + 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); + pa->fs_probed = 0; + 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_partition()). 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: partition 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 partition 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 partitions according to partition number See fdisk_table_sort_partitions(). + * + * 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 template 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 partition 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 template 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; +} + +/** + * fdisk_partition_get_uuid: + * @pa: partition + * + * Returns: partition UUID as string + */ +const char *fdisk_partition_get_uuid(struct fdisk_partition *pa) +{ + return pa ? pa->uuid : NULL; +} + +/** + * fdisk_partition_get_attrs: + * @pa: partition + * + * Returns: partition attributes in string format + */ +const char *fdisk_partition_get_attrs(struct fdisk_partition *pa) +{ + return pa ? pa->attrs : NULL; +} + +/** + * fdisk_partition_set_attrs: + * @pa: partition + * @attrs: attributes + * + * Sets @attrs to @pa. + * + * Return: 0 on success, <0 on error. + */ +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; +} + +/** + * fdisk_partition_is_nested: + * @pa: partition + * + * Returns: 1 if the partition is nested (e.g. MBR logical partition) + */ +int fdisk_partition_is_nested(struct fdisk_partition *pa) +{ + return pa && !FDISK_IS_UNDEF(pa->parent_partno); +} + +/** + * fdisk_partition_is_container: + * @pa: partition + * + * Returns: 1 if the partition is container (e.g. MBR extended partition) + */ +int fdisk_partition_is_container(struct fdisk_partition *pa) +{ + return pa && pa->container; +} + +/** + * fdisk_partition_get_parent: + * @pa: partition + * @parent: parent parno + * + * Returns: returns devno of the parent + */ +int fdisk_partition_get_parent(struct fdisk_partition *pa, size_t *parent) +{ + if (pa && parent) + *parent = pa->parent_partno; + else + return -EINVAL; + return 0; +} + +/** + * fdisk_partition_is_used: + * @pa: partition + * + * Returns: 1 if the partition points to some area + */ +int fdisk_partition_is_used(struct fdisk_partition *pa) +{ + return pa && pa->used; +} + +/** + * fdisk_partition_is_bootable: + * @pa: partition + * + * Returns: 1 if the partition has enabled boot flag + */ +int fdisk_partition_is_bootable(struct fdisk_partition *pa) +{ + return pa && pa->boot == 1; +} + +/** + * fdisk_partition_is_freespace: + * @pa: partition + * + * Returns: 1 if @pa points to freespace + */ +int fdisk_partition_is_freespace(struct fdisk_partition *pa) +{ + return pa && pa->freespace; +} + +/** + * fdisk_partition_is_wholedisk: + * @pa: partition + * + * Returns: 1 if the partition is special whole-disk (e.g. SUN) partition + */ +int fdisk_partition_is_wholedisk(struct fdisk_partition *pa) +{ + return pa && pa->wholedisk; +} + +/** + * fdisk_partition_next_partno: + * @pa: partition + * @cxt: context + * @n: returns partition number + * + * If @pa specified and partno-follow-default (see fdisk_partition_partno_follow_default()) + * enabled then returns next expected partno or -ERANGE on error. + * + * If @pa is NULL, or @pa does not specify any semantic for the next partno + * then use Ask API to ask user for the next partno. In this case returns 1 if + * no free partition available. If fdisk dialogs are disabled then returns -EINVAL. + * + * Returns: 0 on success, <0 on error, or 1 for non-free partno by Ask API. + */ +int fdisk_partition_next_partno( + struct fdisk_partition *pa, + struct fdisk_context *cxt, + size_t *n) +{ + if (!cxt || !n) + return -EINVAL; + + 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 || + fdisk_is_partition_used(cxt, pa->partno)) + return -ERANGE; + *n = pa->partno; + return 0; + + } else if (fdisk_has_dialogs(cxt)) + return fdisk_ask_partnum(cxt, n, 1); + + return -EINVAL; +} + +static int probe_partition_content(struct fdisk_context *cxt, struct fdisk_partition *pa) +{ + int rc = 1; /* nothing */ + + DBG(PART, ul_debugobj(pa, "start probe #%zu partition [cxt %p] >>>", pa->partno, cxt)); + + /* zeroize the current setting */ + strdup_to_struct_member(pa, fstype, NULL); + strdup_to_struct_member(pa, fsuuid, NULL); + strdup_to_struct_member(pa, fslabel, NULL); + + if (!fdisk_partition_has_start(pa) || + !fdisk_partition_has_size(pa)) + goto done; + +#ifdef HAVE_LIBBLKID + else { + uintmax_t start, size; + + blkid_probe pr = blkid_new_probe(); + if (!pr) + goto done; + + DBG(PART, ul_debugobj(pa, "blkid prober: %p", pr)); + + start = fdisk_partition_get_start(pa) * fdisk_get_sector_size(cxt); + size = fdisk_partition_get_size(pa) * fdisk_get_sector_size(cxt); + + if (blkid_probe_set_device(pr, cxt->dev_fd, start, size) == 0 + && blkid_do_fullprobe(pr) == 0) { + + const char *data; + rc = 0; + + if (!blkid_probe_lookup_value(pr, "TYPE", &data, NULL)) + rc = strdup_to_struct_member(pa, fstype, data); + + if (!rc && !blkid_probe_lookup_value(pr, "LABEL", &data, NULL)) + rc = strdup_to_struct_member(pa, fslabel, data); + + if (!rc && !blkid_probe_lookup_value(pr, "UUID", &data, NULL)) + rc = strdup_to_struct_member(pa, fsuuid, data); + } + + blkid_free_probe(pr); + pa->fs_probed = 1; + } +#endif /* HAVE_LIBBLKID */ + +done: + DBG(PART, ul_debugobj(pa, "<<< end probe #%zu partition[cxt %p, rc=%d]", pa->partno, cxt, rc)); + return rc; +} + +/** + * 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_partition *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 || !data) + 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: + p = fdisk_partition_is_bootable(pa) ? strdup("*") : NULL; + break; + case FDISK_FIELD_START: + if (fdisk_partition_has_start(pa)) { + x = fdisk_cround(cxt, pa->start); + rc = pa->start_post ? + asprintf(&p, "%"PRIu64"%c", x, pa->start_post) : + asprintf(&p, "%"PRIu64, 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, "%"PRIu64"%c", x, pa->end_post) : + asprintf(&p, "%"PRIu64, x); + } + break; + case FDISK_FIELD_SIZE: + if (fdisk_partition_has_size(pa)) { + uint64_t sz = pa->size * cxt->sector_size; + + switch (cxt->sizeunit) { + case FDISK_SIZEUNIT_BYTES: + rc = asprintf(&p, "%"PRIu64"", sz); + break; + case FDISK_SIZEUNIT_HUMAN: + if (fdisk_is_details(cxt)) + rc = pa->size_post ? + asprintf(&p, "%"PRIu64"%c", sz, pa->size_post) : + asprintf(&p, "%"PRIu64, sz); + else { + p = size_to_human_string(SIZE_SUFFIX_1LETTER, sz); + if (!p) + rc = -ENOMEM; + } + break; + } + } + break; + case FDISK_FIELD_CYLINDERS: + { + uintmax_t sz = fdisk_partition_has_size(pa) ? pa->size : 0; + if (sz) + /* Why we need to cast that to uintmax_t? */ + rc = asprintf(&p, "%ju", (uintmax_t)(sz / (cxt->geom.heads * cxt->geom.sectors)) + 1); + 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, "%"PRIu64, pa->bsize); + break; + case FDISK_FIELD_FSIZE: + rc = asprintf(&p, "%"PRIu64, pa->fsize); + break; + case FDISK_FIELD_CPG: + rc = asprintf(&p, "%"PRIu64, 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 && *pa->uuid? strdup(pa->uuid) : NULL; + break; + case FDISK_FIELD_NAME: + p = pa->name && *pa->name ? strdup(pa->name) : NULL; + break; + case FDISK_FIELD_ATTR: + p = pa->attrs && *pa->attrs ? strdup(pa->attrs) : NULL; + break; + case FDISK_FIELD_SADDR: + p = pa->start_chs && *pa->start_chs ? strdup(pa->start_chs) : NULL; + break; + case FDISK_FIELD_EADDR: + p = pa->end_chs && *pa->end_chs? strdup(pa->end_chs) : NULL; + break; + case FDISK_FIELD_FSUUID: + if (pa->fs_probed || probe_partition_content(cxt, pa) == 0) + p = pa->fsuuid && *pa->fsuuid ? strdup(pa->fsuuid) : NULL; + break; + case FDISK_FIELD_FSLABEL: + if (pa->fs_probed || probe_partition_content(cxt, pa) == 0) + p = pa->fslabel && *pa->fslabel ? strdup(pa->fslabel) : NULL; + break; + case FDISK_FIELD_FSTYPE: + if (pa->fs_probed || probe_partition_content(cxt, pa) == 0) + p = pa->fstype && *pa->fstype ? strdup(pa->fstype) : NULL; + break; + default: + return -EINVAL; + } + + if (rc < 0) { + rc = -ENOMEM; + free(p); + p = NULL; + + } else if (rc > 0) + rc = 0; + + *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; +} + +static struct fdisk_partition *resize_get_by_offset( + struct fdisk_table *tb, fdisk_sector_t off) +{ + struct fdisk_partition *pa = NULL; + struct fdisk_iter itr; + + fdisk_reset_iter(&itr, FDISK_ITER_FORWARD); + + while (fdisk_table_next_partition(tb, &itr, &pa) == 0) { + if (!fdisk_partition_has_start(pa) || !fdisk_partition_has_size(pa)) + continue; + if (off >= pa->start && off < pa->start + pa->size) + return pa; + } + + return NULL; +} + +/* + * Verify that area addressed by @start is freespace or the @cur[rent] + * partition and continue to the next table entries until it's freespace, and + * counts size of all this space. + * + * This is core of the partition start offset move operation. We can move the + * start within the current partition of to the another free space. It's + * forbidden to move start of the partition to another already defined + * partition. + */ +static int resize_get_last_possible( + struct fdisk_table *tb, + struct fdisk_partition *cur, + fdisk_sector_t start, + fdisk_sector_t *maxsz) +{ + struct fdisk_partition *pa = NULL, *last = NULL; + struct fdisk_iter itr; + + fdisk_reset_iter(&itr, FDISK_ITER_FORWARD); + + *maxsz = 0; + DBG(TAB, ul_debugobj(tb, "checking last possible for start=%ju", (uintmax_t) start)); + + + while (fdisk_table_next_partition(tb, &itr, &pa) == 0) { + + DBG(TAB, ul_debugobj(tb, " checking entry %p [partno=%zu start=%ju, end=%ju, size=%ju%s%s%s]", + pa, + fdisk_partition_get_partno(pa), + (uintmax_t) fdisk_partition_get_start(pa), + (uintmax_t) fdisk_partition_get_end(pa), + (uintmax_t) fdisk_partition_get_size(pa), + fdisk_partition_is_freespace(pa) ? " freespace" : "", + fdisk_partition_is_nested(pa) ? " nested" : "", + fdisk_partition_is_container(pa) ? " container" : "")); + + if (!fdisk_partition_has_start(pa) || + !fdisk_partition_has_size(pa) || + (fdisk_partition_is_container(pa) && pa != cur)) { + DBG(TAB, ul_debugobj(tb, " ignored (no start/size or container)")); + continue; + } + + if (fdisk_partition_is_nested(pa) + && fdisk_partition_is_container(cur) + && pa->parent_partno == cur->partno) { + DBG(TAB, ul_debugobj(tb, " ignore (nested child of the current partition)")); + continue; + } + + /* The current is nested, free space has to be nested within the same parent */ + if (fdisk_partition_is_nested(cur) + && pa->parent_partno != cur->parent_partno) { + DBG(TAB, ul_debugobj(tb, " ignore (nested required)")); + continue; + } + + if (!last) { + if (start >= pa->start && start < pa->start + pa->size) { + if (fdisk_partition_is_freespace(pa) || pa == cur) { + DBG(TAB, ul_debugobj(tb, " accepted as last")); + last = pa; + } else { + DBG(TAB, ul_debugobj(tb, " failed to set last")); + break; + } + + + *maxsz = pa->size - (start - pa->start); + DBG(TAB, ul_debugobj(tb, " new max=%ju", (uintmax_t) *maxsz)); + } + } else if (!fdisk_partition_is_freespace(pa) && pa != cur) { + DBG(TAB, ul_debugobj(tb, " no free space behind current")); + break; + } else { + last = pa; + *maxsz = pa->size - (start - pa->start); + DBG(TAB, ul_debugobj(tb, " new max=%ju (last updated)", (uintmax_t) *maxsz)); + } + } + + if (last) + DBG(PART, ul_debugobj(cur, "resize: max size=%ju", (uintmax_t) *maxsz)); + else + DBG(PART, ul_debugobj(cur, "resize: nothing usable after %ju", (uintmax_t) start)); + + return last ? 0 : -1; +} + +/* + * Uses template @tpl to recount start and size change of the partition @res. The + * @tpl->size and @tpl->start are interpreted as relative to the current setting. + */ +static int recount_resize( + struct fdisk_context *cxt, size_t partno, + struct fdisk_partition *res, struct fdisk_partition *tpl) +{ + fdisk_sector_t start, size, xsize; + struct fdisk_partition *cur = NULL; + struct fdisk_table *tb = NULL; + int rc; + + DBG(PART, ul_debugobj(tpl, ">>> resize requested")); + + FDISK_INIT_UNDEF(start); + FDISK_INIT_UNDEF(size); + + rc = fdisk_get_partitions(cxt, &tb); + if (!rc) + rc = fdisk_get_freespaces(cxt, &tb); + if (rc) + return rc; + + fdisk_table_sort_partitions(tb, fdisk_partition_cmp_start); + + DBG(PART, ul_debugobj(tpl, "resize partition partno=%zu in table:", partno)); + ON_DBG(PART, fdisk_debug_print_table(tb)); + + cur = fdisk_table_get_partition_by_partno(tb, partno); + if (!cur) { + fdisk_unref_table(tb); + return -EINVAL; + } + + /* 1a) set new start - change relative to the current on-disk setting */ + if (tpl->movestart && fdisk_partition_has_start(tpl)) { + start = fdisk_partition_get_start(cur); + if (tpl->movestart == FDISK_MOVE_DOWN) { + if (fdisk_partition_get_start(tpl) > start) + goto erange; + start -= fdisk_partition_get_start(tpl); + } else + start += fdisk_partition_get_start(tpl); + + DBG(PART, ul_debugobj(tpl, "resize: moving start %s relative, new start: %ju", + tpl->movestart == FDISK_MOVE_DOWN ? "DOWN" : "UP", (uintmax_t)start)); + + /* 1b) set new start - absolute number */ + } else if (fdisk_partition_has_start(tpl)) { + start = fdisk_partition_get_start(tpl); + DBG(PART, ul_debugobj(tpl, "resize: moving start to absolute offset: %ju", + (uintmax_t)start)); + } + + /* 2) verify that start is within the current partition or any freespace area */ + if (!FDISK_IS_UNDEF(start)) { + struct fdisk_partition *area = resize_get_by_offset(tb, start); + if (area == cur) + DBG(PART, ul_debugobj(tpl, "resize: start points to the current partition")); + else if (area && fdisk_partition_is_freespace(area)) + DBG(PART, ul_debugobj(tpl, "resize: start points to freespace")); + else if (!area && start >= cxt->first_lba && start < cxt->first_lba + (cxt->grain / cxt->sector_size)) + DBG(PART, ul_debugobj(tpl, "resize: start points before first partition")); + else + goto erange; + } else { + /* no change, start points to the current partition */ + DBG(PART, ul_debugobj(tpl, "resize: start unchanged")); + start = fdisk_partition_get_start(cur); + } + + /* 3a) set new size -- reduce */ + if (tpl->resize == FDISK_RESIZE_REDUCE && fdisk_partition_has_size(tpl)) { + DBG(PART, ul_debugobj(tpl, "resize: reduce")); + size = fdisk_partition_get_size(cur); + if (fdisk_partition_get_size(tpl) > size) + goto erange; + size -= fdisk_partition_get_size(tpl); + + /* 3b) set new size -- enlarge */ + } else if (tpl->resize == FDISK_RESIZE_ENLARGE && fdisk_partition_has_size(tpl)) { + DBG(PART, ul_debugobj(tpl, "resize: enlarge")); + size = fdisk_partition_get_size(cur); + size += fdisk_partition_get_size(tpl); + + /* 3c) set new size -- no size specified, enlarge to all freespace */ + } else if (tpl->resize == FDISK_RESIZE_ENLARGE) { + DBG(PART, ul_debugobj(tpl, "resize: enlarge to all possible")); + if (resize_get_last_possible(tb, cur, start, &size)) + goto erange; + + /* 3d) set new size -- absolute number */ + } else if (fdisk_partition_has_size(tpl)) { + DBG(PART, ul_debugobj(tpl, "resize: new absolute size")); + size = fdisk_partition_get_size(tpl); + } + + /* 4) verify that size is within the current partition or next free space */ + xsize = !FDISK_IS_UNDEF(size) ? size : fdisk_partition_get_size(cur); + + if (fdisk_partition_has_size(cur)) { + fdisk_sector_t maxsz; + + if (resize_get_last_possible(tb, cur, start, &maxsz)) + goto erange; + DBG(PART, ul_debugobj(tpl, "resize: size=%ju, max=%ju", + (uintmax_t) xsize, (uintmax_t) maxsz)); + if (xsize > maxsz) + goto erange; + } + + if (!FDISK_IS_UNDEF(size)) { + DBG(PART, ul_debugobj(tpl, "resize: size unchanged (undefined)")); + } + + + DBG(PART, ul_debugobj(tpl, "<<< resize: SUCCESS: start %ju->%ju; size %ju->%ju", + (uintmax_t) fdisk_partition_get_start(cur), (uintmax_t) start, + (uintmax_t) fdisk_partition_get_size(cur), (uintmax_t) size)); + res->start = start; + res->size = size; + fdisk_unref_table(tb); + return 0; +erange: + DBG(PART, ul_debugobj(tpl, "<<< resize: FAILED")); + fdisk_warnx(cxt, _("Failed to resize partition #%zu."), partno + 1); + fdisk_unref_table(tb); + return -ERANGE; + +} + +/** + * 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) +{ + struct fdisk_partition *xpa = pa, *tmp = NULL; + int rc, wipe = 0; + + if (!cxt || !cxt->label || !pa) + return -EINVAL; + if (!cxt->label->op->set_part) + return -ENOSYS; + + pa->fs_probed = 0; + + if (!fdisk_is_partition_used(cxt, partno)) { + pa->partno = partno; + return fdisk_add_partition(cxt, pa, NULL); + } + + if (pa->resize || fdisk_partition_has_start(pa) || fdisk_partition_has_size(pa)) { + xpa = __copy_partition(pa); + if (!xpa) { + rc = -ENOMEM; + goto done; + } + xpa->movestart = 0; + xpa->resize = 0; + FDISK_INIT_UNDEF(xpa->size); + FDISK_INIT_UNDEF(xpa->start); + + rc = recount_resize(cxt, partno, xpa, pa); + if (rc) + goto done; + } + + DBG(CXT, ul_debugobj(cxt, "setting partition %zu %p (start=%ju, end=%ju, size=%ju)", + partno, xpa, + (uintmax_t) fdisk_partition_get_start(xpa), + (uintmax_t) fdisk_partition_get_end(xpa), + (uintmax_t) fdisk_partition_get_size(xpa))); + + /* disable wipe for old offset/size setting */ + if (fdisk_get_partition(cxt, partno, &tmp) == 0 && tmp) { + wipe = fdisk_set_wipe_area(cxt, fdisk_partition_get_start(tmp), + fdisk_partition_get_size(tmp), FALSE); + fdisk_unref_partition(tmp); + } + + /* call label driver */ + rc = cxt->label->op->set_part(cxt, partno, xpa); + + /* enable wipe for new offset/size */ + if (!rc && wipe) + fdisk_wipe_partition(cxt, partno, TRUE); +done: + DBG(CXT, ul_debugobj(cxt, "set_partition() rc=%d", rc)); + if (xpa != pa) + fdisk_unref_partition(xpa); + return rc; +} + +/** + * fdisk_wipe_partition: + * @cxt: fdisk context + * @partno: partition number + * @enable: 0 or 1 + * + * Enable/disable filesystems/RAIDs wiping in area defined by partition start and size. + * + * Returns: <0 in case of error, 0 on success + * Since: 2.29 + */ +int fdisk_wipe_partition(struct fdisk_context *cxt, size_t partno, int enable) +{ + struct fdisk_partition *pa = NULL; + int rc; + + rc = fdisk_get_partition(cxt, partno, &pa); + if (rc) + return rc; + + rc = fdisk_set_wipe_area(cxt, fdisk_partition_get_start(pa), + fdisk_partition_get_size(pa), enable); + fdisk_unref_partition(pa); + return rc < 0 ? rc : 0; +} + +/** + * fdisk_partition_has_wipe: + * @cxt: fdisk context + * @pa: partition + * + * Since: 2.30 + * + * Returns: 1 if the area specified by @pa will be wiped by write command, or 0. + */ +int fdisk_partition_has_wipe(struct fdisk_context *cxt, struct fdisk_partition *pa) +{ + return fdisk_has_wipe_area(cxt, fdisk_partition_get_start(pa), + fdisk_partition_get_size(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 missing the libfdisk will ask by + * fdisk_ask_ API. + * + * The @pa template is is important for non-interactive partitioning, + * especially for MBR where is necessary to differentiate between + * primary/logical; this is done by start offset or/and partno. + * The rules for MBR: + * + * A) template specifies start within extended partition: add logical + * B) template specifies start out of extended partition: add primary + * C) template specifies start (or default), partno < 4: add primary + * D) template specifies default start, partno >= 4: add logical + * + * otherwise MBR driver uses Ask-API to get missing information. + * + * 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; + + if (!cxt || !cxt->label) + return -EINVAL; + if (!cxt->label->op->add_part) + return -ENOSYS; + if (fdisk_missing_geometry(cxt)) + return -EINVAL; + + if (pa) { + pa->fs_probed = 0; + DBG(CXT, ul_debugobj(cxt, "adding new partition %p", pa)); + if (fdisk_partition_has_start(pa)) + DBG(CXT, ul_debugobj(cxt, " start: %ju", (uintmax_t) fdisk_partition_get_start(pa))); + if (fdisk_partition_has_end(pa)) + DBG(CXT, ul_debugobj(cxt, " end: %ju", (uintmax_t) fdisk_partition_get_end(pa))); + if (fdisk_partition_has_size(pa)) + DBG(CXT, ul_debugobj(cxt, " size: %ju", (uintmax_t) fdisk_partition_get_size(pa))); + + DBG(CXT, ul_debugobj(cxt, " defaults: start=%s, end=%s, partno=%s", + 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; + + fdisk_wipe_partition(cxt, partno, 0); + + 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 = 0; + + 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) + * + * Check if the partition number @n is used by partition table. This function + * does not check if the device is used (e.g. mounted) by system! + * + * 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); +} + |