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-rw-r--r--libblkid/libfdisk/src/context.c1017
1 files changed, 1017 insertions, 0 deletions
diff --git a/libblkid/libfdisk/src/context.c b/libblkid/libfdisk/src/context.c
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index 000000000..2a4d377e0
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+++ b/libblkid/libfdisk/src/context.c
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+#ifdef HAVE_LIBBLKID
+# include <blkid.h>
+#endif
+
+#include "fdiskP.h"
+
+
+/**
+ * SECTION: context
+ * @title: Context
+ * @short_description: stores info about device, labels etc.
+ *
+ * The library distinguish between three types of partitioning objects.
+ *
+ * on-disk data
+ * - disk label specific
+ * - probed and read by disklabel drivers when assign device to the context
+ * or when switch to another disk label type
+ * - only fdisk_write_disklabel() modify on-disk data
+ *
+ * in-memory data
+ * - generic data and disklabel specific data stored in struct fdisk_label
+ * - all partitioning operations are based on in-memory data only
+ *
+ * struct fdisk_partition
+ * - provides abstraction to present partitions to users
+ * - fdisk_partition is possible to gather to fdisk_table container
+ * - used as unified template for new partitions
+ * - the struct fdisk_partition is always completely independent object and
+ * any change to the object has no effect to in-memory (or on-disk) label data
+ */
+
+/**
+ * fdisk_new_context:
+ *
+ * Returns: newly allocated libfdisk handler
+ */
+struct fdisk_context *fdisk_new_context(void)
+{
+ struct fdisk_context *cxt;
+
+ cxt = calloc(1, sizeof(*cxt));
+ if (!cxt)
+ return NULL;
+
+ DBG(CXT, ul_debugobj(cxt, "alloc"));
+ cxt->dev_fd = -1;
+ cxt->refcount = 1;
+
+ /*
+ * Allocate label specific structs.
+ *
+ * This is necessary (for example) to store label specific
+ * context setting.
+ */
+ cxt->labels[ cxt->nlabels++ ] = fdisk_new_gpt_label(cxt);
+ cxt->labels[ cxt->nlabels++ ] = fdisk_new_dos_label(cxt);
+ cxt->labels[ cxt->nlabels++ ] = fdisk_new_bsd_label(cxt);
+ cxt->labels[ cxt->nlabels++ ] = fdisk_new_sgi_label(cxt);
+ cxt->labels[ cxt->nlabels++ ] = fdisk_new_sun_label(cxt);
+
+ return cxt;
+}
+
+static int init_nested_from_parent(struct fdisk_context *cxt, int isnew)
+{
+ struct fdisk_context *parent;
+
+ assert(cxt);
+ assert(cxt->parent);
+
+ parent = cxt->parent;
+
+ cxt->alignment_offset = parent->alignment_offset;
+ cxt->ask_cb = parent->ask_cb;
+ cxt->ask_data = parent->ask_data;
+ cxt->dev_fd = parent->dev_fd;
+ cxt->first_lba = parent->first_lba;
+ cxt->firstsector_bufsz = parent->firstsector_bufsz;
+ cxt->firstsector = parent->firstsector;
+ cxt->geom = parent->geom;
+ cxt->grain = parent->grain;
+ cxt->io_size = parent->io_size;
+ cxt->last_lba = parent->last_lba;
+ cxt->min_io_size = parent->min_io_size;
+ cxt->optimal_io_size = parent->optimal_io_size;
+ cxt->phy_sector_size = parent->phy_sector_size;
+ cxt->readonly = parent->readonly;
+ cxt->script = parent->script;
+ fdisk_ref_script(cxt->script);
+ cxt->sector_size = parent->sector_size;
+ cxt->total_sectors = parent->total_sectors;
+ cxt->user_geom = parent->user_geom;
+ cxt->user_log_sector = parent->user_log_sector;
+ cxt->user_pyh_sector = parent->user_pyh_sector;
+
+ /* parent <--> nested independent setting, initialize for new nested
+ * contexts only */
+ if (isnew) {
+ cxt->listonly = parent->listonly;
+ cxt->display_details = parent->display_details;
+ cxt->display_in_cyl_units = parent->display_in_cyl_units;
+ }
+
+ free(cxt->dev_path);
+ cxt->dev_path = NULL;
+
+ if (parent->dev_path) {
+ cxt->dev_path = strdup(parent->dev_path);
+ if (!cxt->dev_path)
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+/**
+ * fdisk_new_nested_context:
+ * @parent: parental context
+ * @name: optional label name (e.g. "bsd")
+ *
+ * Create a new nested fdisk context for nested disk labels (e.g. BSD or PMBR).
+ * The function also probes for the nested label on the device if device is
+ * already assigned to parent.
+ *
+ * The new context is initialized according to @parent and both context shares
+ * some settings and file descriptor to the device. The child propagate some
+ * changes (like fdisk_assign_device()) to parent, but it does not work
+ * vice-versa. The behavior is undefined if you assign another device to
+ * parent.
+ *
+ * Returns: new context for nested partition table.
+ */
+struct fdisk_context *fdisk_new_nested_context(struct fdisk_context *parent,
+ const char *name)
+{
+ struct fdisk_context *cxt;
+ struct fdisk_label *lb = NULL;
+
+ assert(parent);
+
+ cxt = calloc(1, sizeof(*cxt));
+ if (!cxt)
+ return NULL;
+
+ DBG(CXT, ul_debugobj(parent, "alloc nested [%p]", cxt));
+ cxt->refcount = 1;
+
+ fdisk_ref_context(parent);
+ cxt->parent = parent;
+
+ if (init_nested_from_parent(cxt, 1) != 0)
+ return NULL;
+
+ if (name) {
+ if (strcmp(name, "bsd") == 0)
+ lb = cxt->labels[ cxt->nlabels++ ] = fdisk_new_bsd_label(cxt);
+ else if (strcmp(name, "dos") == 0)
+ lb = cxt->labels[ cxt->nlabels++ ] = fdisk_new_dos_label(cxt);
+ }
+
+ if (lb && parent->dev_fd >= 0) {
+ DBG(CXT, ul_debugobj(cxt, "probing for nested %s", lb->name));
+
+ cxt->label = lb;
+
+ if (lb->op->probe(cxt) == 1)
+ __fdisk_switch_label(cxt, lb);
+ else {
+ DBG(CXT, ul_debugobj(cxt, "not found %s label", lb->name));
+ if (lb->op->deinit)
+ lb->op->deinit(lb);
+ cxt->label = NULL;
+ }
+ }
+
+ return cxt;
+}
+
+
+/**
+ * fdisk_ref_context:
+ * @cxt: context pointer
+ *
+ * Increments reference counter.
+ */
+void fdisk_ref_context(struct fdisk_context *cxt)
+{
+ if (cxt)
+ cxt->refcount++;
+}
+
+/**
+ * fdisk_get_label:
+ * @cxt: context instance
+ * @name: label name (e.g. "gpt")
+ *
+ * If no @name specified then returns the current context label.
+ *
+ * The label is allocated and maintained within the context #cxt. There is
+ * nothing like reference counting for labels, you cannot delallocate the
+ * label.
+ *
+ * Returns: label struct or NULL in case of error.
+ */
+struct fdisk_label *fdisk_get_label(struct fdisk_context *cxt, const char *name)
+{
+ size_t i;
+
+ assert(cxt);
+
+ if (!name)
+ return cxt->label;
+
+ for (i = 0; i < cxt->nlabels; i++)
+ if (cxt->labels[i]
+ && strcmp(cxt->labels[i]->name, name) == 0)
+ return cxt->labels[i];
+
+ DBG(CXT, ul_debugobj(cxt, "failed to found %s label driver", name));
+ return NULL;
+}
+
+/**
+ * fdisk_next_label:
+ * @cxt: context instance
+ * @lb: returns pointer to the next label
+ *
+ * <informalexample>
+ * <programlisting>
+ * // print all supported labels
+ * struct fdisk_context *cxt = fdisk_new_context();
+ * struct fdisk_label *lb = NULL;
+ *
+ * while (fdisk_next_label(cxt, &lb) == 0)
+ * print("label name: %s\n", fdisk_label_get_name(lb));
+ * fdisk_unref_context(cxt);
+ * </programlisting>
+ * </informalexample>
+ *
+ * Returns: <0 in case of error, 0 on success, 1 at the end.
+ */
+int fdisk_next_label(struct fdisk_context *cxt, struct fdisk_label **lb)
+{
+ size_t i;
+ struct fdisk_label *res = NULL;
+
+ if (!lb || !cxt)
+ return -EINVAL;
+
+ if (!*lb)
+ res = cxt->labels[0];
+ else {
+ for (i = 1; i < cxt->nlabels; i++) {
+ if (*lb == cxt->labels[i - 1]) {
+ res = cxt->labels[i];
+ break;
+ }
+ }
+ }
+
+ *lb = res;
+ return res ? 0 : 1;
+}
+
+/**
+ * fdisk_get_nlabels:
+ * @cxt: context
+ *
+ * Returns: number of supported label types
+ */
+size_t fdisk_get_nlabels(struct fdisk_context *cxt)
+{
+ return cxt ? cxt->nlabels : 0;
+}
+
+int __fdisk_switch_label(struct fdisk_context *cxt, struct fdisk_label *lb)
+{
+ if (!lb || !cxt)
+ return -EINVAL;
+ if (lb->disabled) {
+ DBG(CXT, ul_debugobj(cxt, "*** attempt to switch to disabled label %s -- ignore!", lb->name));
+ return -EINVAL;
+ }
+ cxt->label = lb;
+ DBG(CXT, ul_debugobj(cxt, "--> switching context to %s!", lb->name));
+ return 0;
+}
+
+/**
+ * fdisk_has_label:
+ * @cxt: fdisk context
+ *
+ * Returns: return 1 if there is label on the device.
+ */
+int fdisk_has_label(struct fdisk_context *cxt)
+{
+ return cxt && cxt->label;
+}
+
+/**
+ * fdisk_get_npartitions:
+ * @cxt: context
+ *
+ * The maximal number of the partitions depends on disklabel and does not
+ * have to describe the real limit of PT.
+ *
+ * For example the limit for MBR without extend partition is 4, with extended
+ * partition it's unlimited (so the function returns the current number of all
+ * partitions in this case).
+ *
+ * And for example for GPT it depends on space allocated on disk for array of
+ * entry records (usually 128).
+ *
+ * It's fine to use fdisk_get_npartitions() in loops, but don't forget that
+ * partition may be unused (see fdisk_is_partition_used()).
+ *
+ * <informalexample>
+ * <programlisting>
+ * struct fdisk_partition *pa = NULL;
+ * size_t i, nmax = fdisk_get_npartitions(cxt);
+ *
+ * for (i = 0; i < nmax; i++) {
+ * if (!fdisk_is_partition_used(cxt, i))
+ * continue;
+ * ... do something ...
+ * }
+ * </programlisting>
+ * </informalexample>
+ *
+ * Note that the recommended way to list partitions is to use
+ * fdisk_get_partitions() and struct fdisk_table than ask disk driver for each
+ * individual partitions.
+ *
+ * Returns: maximal number of partitions for the current label.
+ */
+size_t fdisk_get_npartitions(struct fdisk_context *cxt)
+{
+ return cxt && cxt->label ? cxt->label->nparts_max : 0;
+}
+
+/**
+ * fdisk_is_labeltype:
+ * @cxt: fdisk context
+ * @id: FDISK_DISKLABEL_*
+ *
+ * See also fdisk_is_label() macro in libfdisk.h.
+ *
+ * Returns: return 1 if the current label is @id
+ */
+int fdisk_is_labeltype(struct fdisk_context *cxt, enum fdisk_labeltype id)
+{
+ assert(cxt);
+
+ return cxt->label && fdisk_label_get_type(cxt->label) == id;
+}
+
+/**
+ * fdisk_get_parent:
+ * @cxt: nested fdisk context
+ *
+ * Returns: pointer to parental context, or NULL
+ */
+struct fdisk_context *fdisk_get_parent(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->parent;
+}
+
+static void reset_context(struct fdisk_context *cxt)
+{
+ size_t i;
+
+ DBG(CXT, ul_debugobj(cxt, "*** resetting context"));
+
+ /* reset drives' private data */
+ for (i = 0; i < cxt->nlabels; i++)
+ fdisk_deinit_label(cxt->labels[i]);
+
+ if (cxt->parent) {
+ /* the first sector may be independent on parent */
+ if (cxt->parent->firstsector != cxt->firstsector)
+ free(cxt->firstsector);
+ } else {
+ /* we close device only in primary context */
+ if (cxt->dev_fd > -1)
+ close(cxt->dev_fd);
+ free(cxt->firstsector);
+ }
+
+ free(cxt->dev_path);
+ cxt->dev_path = NULL;
+
+ cxt->dev_fd = -1;
+ cxt->firstsector = NULL;
+ cxt->firstsector_bufsz = 0;
+
+ fdisk_zeroize_device_properties(cxt);
+
+ fdisk_unref_script(cxt->script);
+ cxt->script = NULL;
+
+ cxt->label = NULL;
+}
+
+/*
+ * This function prints a warning if the device is not wiped (e.g. wipefs(8).
+ * Please don't call this function if there is already a PT.
+ *
+ * Returns: 0 if nothing found, < 0 on error, 1 if found a signature
+ */
+static int warn_wipe(struct fdisk_context *cxt)
+{
+#ifdef HAVE_LIBBLKID
+ blkid_probe pr;
+#endif
+ int rc = 0;
+
+ assert(cxt);
+
+ if (fdisk_has_label(cxt) || cxt->dev_fd < 0)
+ return -EINVAL;
+#ifdef HAVE_LIBBLKID
+ DBG(CXT, ul_debugobj(cxt, "wipe check: initialize libblkid prober"));
+
+ pr = blkid_new_probe();
+ if (!pr)
+ return -ENOMEM;
+ rc = blkid_probe_set_device(pr, cxt->dev_fd, 0, 0);
+ if (rc)
+ return rc;
+
+ blkid_probe_enable_superblocks(pr, 1);
+ blkid_probe_set_superblocks_flags(pr, BLKID_SUBLKS_TYPE);
+ blkid_probe_enable_partitions(pr, 1);
+
+ /* we care about the first found FS/raid, so don't call blkid_do_probe()
+ * in loop or don't use blkid_do_fullprobe() ... */
+ rc = blkid_do_probe(pr);
+ if (rc == 0) {
+ const char *name = NULL;
+
+ if (blkid_probe_lookup_value(pr, "TYPE", &name, 0) == 0 ||
+ blkid_probe_lookup_value(pr, "PTTYPE", &name, 0) == 0) {
+ fdisk_warnx(cxt, _(
+ "%s: device contains a valid '%s' signature; it is "
+ "strongly recommended to wipe the device with "
+ "wipefs(8) if this is unexpected, in order to "
+ "avoid possible collisions"), cxt->dev_path, name);
+ rc = 1;
+ }
+ }
+
+ blkid_free_probe(pr);
+#endif
+ return rc;
+}
+
+/**
+ * fdisk_assign_device:
+ * @cxt: context
+ * @fname: path to the device to be handled
+ * @readonly: how to open the device
+ *
+ * Open the device, discovery topology, geometry, detect disklabel and switch
+ * the current label driver to reflect the probing result.
+ *
+ * Note that this function resets all generic setting in context. If the @cxt
+ * is nested context then the device is assigned to the parental context and
+ * necessary properties are copied to the @cxt. The change is propagated in
+ * child->parent direction only. It's impossible to use a different device for
+ * primary and nested contexts.
+ *
+ * Returns: 0 on success, < 0 on error.
+ */
+int fdisk_assign_device(struct fdisk_context *cxt,
+ const char *fname, int readonly)
+{
+ int fd;
+
+ DBG(CXT, ul_debugobj(cxt, "assigning device %s", fname));
+ assert(cxt);
+
+ /* redirect request to parent */
+ if (cxt->parent) {
+ int rc, org = fdisk_is_listonly(cxt->parent);
+
+ /* assign_device() is sensitive to "listonly" mode, so let's
+ * follow the current context setting for the parent to avoid
+ * unwanted extra warnings. */
+ fdisk_enable_listonly(cxt->parent, fdisk_is_listonly(cxt));
+
+ rc = fdisk_assign_device(cxt->parent, fname, readonly);
+ fdisk_enable_listonly(cxt->parent, org);
+
+ if (!rc)
+ rc = init_nested_from_parent(cxt, 0);
+ if (!rc)
+ fdisk_probe_labels(cxt);
+ return rc;
+ }
+
+ reset_context(cxt);
+
+ fd = open(fname, (readonly ? O_RDONLY : O_RDWR ) | O_CLOEXEC);
+ if (fd < 0)
+ return -errno;
+
+ cxt->readonly = readonly;
+ cxt->dev_fd = fd;
+ cxt->dev_path = strdup(fname);
+ if (!cxt->dev_path)
+ goto fail;
+
+ fdisk_discover_topology(cxt);
+ fdisk_discover_geometry(cxt);
+
+ if (fdisk_read_firstsector(cxt) < 0)
+ goto fail;
+
+ /* detect labels and apply labes specific stuff (e.g geomery)
+ * to the context */
+ fdisk_probe_labels(cxt);
+
+ /* let's apply user geometry *after* label prober
+ * to make it possible to override in-label setting */
+ fdisk_apply_user_device_properties(cxt);
+
+ /* warn about obsolete stuff on the device if we aren't in
+ * list-only mode and there is not PT yet */
+ if (!fdisk_is_listonly(cxt) && !fdisk_has_label(cxt))
+ warn_wipe(cxt);
+
+ DBG(CXT, ul_debugobj(cxt, "initialized for %s [%s]",
+ fname, readonly ? "READ-ONLY" : "READ-WRITE"));
+ return 0;
+fail:
+ DBG(CXT, ul_debugobj(cxt, "failed to assign device"));
+ return -errno;
+}
+
+/**
+ * fdisk_deassign_device:
+ * @cxt: context
+ * @nosync: disable fsync()
+ *
+ * Close device and call fsync(). If the @cxt is nested context than the
+ * request is redirected to the parent.
+ *
+ * Returns: 0 on success, < 0 on error.
+ */
+int fdisk_deassign_device(struct fdisk_context *cxt, int nosync)
+{
+ assert(cxt);
+ assert(cxt->dev_fd >= 0);
+
+ if (cxt->parent) {
+ int rc = fdisk_deassign_device(cxt->parent, nosync);
+
+ if (!rc)
+ rc = init_nested_from_parent(cxt, 0);
+ return rc;
+ }
+
+ if (cxt->readonly)
+ close(cxt->dev_fd);
+ else {
+ if (fsync(cxt->dev_fd) || close(cxt->dev_fd)) {
+ fdisk_warn(cxt, _("%s: close device failed"),
+ cxt->dev_path);
+ return -errno;
+ }
+
+ if (!nosync) {
+ fdisk_info(cxt, _("Syncing disks."));
+ sync();
+ }
+ }
+
+ free(cxt->dev_path);
+ cxt->dev_path = NULL;
+
+ cxt->dev_fd = -1;
+
+ return 0;
+}
+
+/**
+ * fdisk_is_readonly:
+ * @cxt: context
+ *
+ * Returns: 1 if device open readonly
+ */
+int fdisk_is_readonly(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->readonly;
+}
+
+/**
+ * fdisk_unref_context:
+ * @cxt: fdisk context
+ *
+ * Deallocates context struct.
+ */
+void fdisk_unref_context(struct fdisk_context *cxt)
+{
+ int i;
+
+ if (!cxt)
+ return;
+
+ cxt->refcount--;
+ if (cxt->refcount <= 0) {
+ DBG(CXT, ul_debugobj(cxt, "freeing context %p for %s", cxt, cxt->dev_path));
+
+ reset_context(cxt); /* this is sensitive to parent<->child relationship! */
+
+ /* deallocate label's private stuff */
+ for (i = 0; i < cxt->nlabels; i++) {
+ if (!cxt->labels[i])
+ continue;
+ if (cxt->labels[i]->op->free)
+ cxt->labels[i]->op->free(cxt->labels[i]);
+ else
+ free(cxt->labels[i]);
+ }
+
+ fdisk_unref_context(cxt->parent);
+ cxt->parent = NULL;
+
+ free(cxt);
+ }
+}
+
+
+/**
+ * fdisk_enable_details:
+ * @cxt: context
+ * @enable: true/flase
+ *
+ * Enables or disables "details" display mode. This function has effect to
+ * fdisk_partition_to_string() function.
+ *
+ * Returns: 0 on success, < 0 on error.
+ */
+int fdisk_enable_details(struct fdisk_context *cxt, int enable)
+{
+ assert(cxt);
+ cxt->display_details = enable ? 1 : 0;
+ return 0;
+}
+
+/**
+ * fdisk_is_details:
+ * @cxt: context
+ *
+ * Returns: 1 if details are enabled
+ */
+int fdisk_is_details(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->display_details == 1;
+}
+
+/**
+ * fdisk_enable_listonly:
+ * @cxt: context
+ * @enable: true/flase
+ *
+ * Just list partition only, don't care about another details, mistakes, ...
+ *
+ * Returns: 0 on success, < 0 on error.
+ */
+int fdisk_enable_listonly(struct fdisk_context *cxt, int enable)
+{
+ assert(cxt);
+ cxt->listonly = enable ? 1 : 0;
+ return 0;
+}
+
+/**
+ * fdisk_is_listonly:
+ * @cxt: context
+ *
+ * Returns: 1 if list-only mode enabled
+ */
+int fdisk_is_listonly(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->listonly == 1;
+}
+
+
+/**
+ * fdisk_set_unit:
+ * @cxt: context
+ * @str: "cylinder" or "sector".
+ *
+ * This is pure shit, unfortunately for example Sun addresses begin of the
+ * partition by cylinders...
+ *
+ * Returns: 0 on succes, <0 on error.
+ */
+int fdisk_set_unit(struct fdisk_context *cxt, const char *str)
+{
+ assert(cxt);
+
+ cxt->display_in_cyl_units = 0;
+
+ if (!str)
+ return 0;
+
+ if (strcmp(str, "cylinder") == 0 || strcmp(str, "cylinders") == 0)
+ cxt->display_in_cyl_units = 1;
+
+ else if (strcmp(str, "sector") == 0 || strcmp(str, "sectors") == 0)
+ cxt->display_in_cyl_units = 0;
+
+ DBG(CXT, ul_debugobj(cxt, "display unit: %s", fdisk_get_unit(cxt, 0)));
+ return 0;
+}
+
+/**
+ * fdisk_get_unit:
+ * @cxt: context
+ * @n: FDISK_PLURAL or FDISK_SINGULAR
+ *
+ * Returns: unit name.
+ */
+const char *fdisk_get_unit(struct fdisk_context *cxt, int n)
+{
+ assert(cxt);
+
+ if (fdisk_use_cylinders(cxt))
+ return P_("cylinder", "cylinders", n);
+ return P_("sector", "sectors", n);
+}
+
+/**
+ * fdisk_use_cylinders:
+ * @cxt: context
+ *
+ * Returns: 1 if user wants to display in cylinders.
+ */
+int fdisk_use_cylinders(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->display_in_cyl_units == 1;
+}
+
+/**
+ * fdisk_get_units_per_sector:
+ * @cxt: context
+ *
+ * This is necessary only for brain dead situations when we use "cylinders";
+ *
+ * Returns: number of "units" per sector, default is 1 if display unit is sector.
+ */
+unsigned int fdisk_get_units_per_sector(struct fdisk_context *cxt)
+{
+ assert(cxt);
+
+ if (fdisk_use_cylinders(cxt)) {
+ assert(cxt->geom.heads);
+ return cxt->geom.heads * cxt->geom.sectors;
+ }
+ return 1;
+}
+
+/**
+ * fdisk_get_optimal_iosize:
+ * @cxt: context
+ *
+ * The optimal I/O is optional and does not have to be provided by device,
+ * anyway libfdisk never returns zero. If the optimal I/O size is not provided
+ * then libfdisk returns minimal I/O size or sector size.
+ *
+ * Returns: optimal I/O size in bytes.
+ */
+unsigned long fdisk_get_optimal_iosize(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->optimal_io_size ? cxt->optimal_io_size : cxt->io_size;
+}
+
+/**
+ * fdisk_get_minimal_iosize:
+ * @cxt: context
+ *
+ * Returns: minimal I/O size in bytes
+ */
+unsigned long fdisk_get_minimal_iosize(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->min_io_size;
+}
+
+/**
+ * fdisk_get_physector_size:
+ * @cxt: context
+ *
+ * Returns: physical sector size in bytes
+ */
+unsigned long fdisk_get_physector_size(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->phy_sector_size;
+}
+
+/**
+ * fdisk_get_sector_size:
+ * @cxt: context
+ *
+ * Returns: logical sector size in bytes
+ */
+unsigned long fdisk_get_sector_size(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->sector_size;
+}
+
+/**
+ * fdisk_get_alignment_offset
+ * @cxt: context
+ *
+ * The alignment offset is offset between logical and physical sectors. For
+ * backward compatibility the first logical sector on 4K disks does no have to
+ * start on the same place like physical sectors.
+ *
+ * Returns: alignment offset in bytes
+ */
+unsigned long fdisk_get_alignment_offset(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->alignment_offset;
+}
+
+/**
+ * fdisk_get_grain_size:
+ * @cxt: context
+ *
+ * Returns: grain in bytes used to align partitions (usually 1MiB)
+ */
+unsigned long fdisk_get_grain_size(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->grain;
+}
+
+/**
+ * fdisk_get_first_lba:
+ * @cxt: context
+ *
+ * Returns: first possible LBA on disk for data partitions.
+ */
+fdisk_sector_t fdisk_get_first_lba(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->first_lba;
+}
+
+/**
+ * fdisk_set_first_lba:
+ * @cxt: fdisk context
+ * @lba: first possible logical sector for data
+ *
+ * It's strongly recommended to use the default library setting. The first LBA
+ * is always reseted by fdisk_assign_device(), fdisk_override_geometry()
+ * and fdisk_reset_alignment(). This is very low level function and library
+ * does not check if your setting makes any sense.
+ *
+ * This function is necessary only when you want to work with very unusual
+ * partition tables like GPT protective MBR or hybrid partition tables on
+ * bootable media where the first partition may start on very crazy offsets.
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+fdisk_sector_t fdisk_set_first_lba(struct fdisk_context *cxt, fdisk_sector_t lba)
+{
+ assert(cxt);
+ DBG(CXT, ul_debugobj(cxt, "setting first LBA from %ju to %ju",
+ (uintmax_t) cxt->first_lba, (uintmax_t) lba));
+ cxt->first_lba = lba;
+ return 0;
+}
+
+/**
+ * fdisk_get_last_lba:
+ * @cxt: fdisk context
+ *
+ * Note that the device has to be already assigned.
+ *
+ * Returns: last possible LBA on device
+ */
+fdisk_sector_t fdisk_get_last_lba(struct fdisk_context *cxt)
+{
+ return cxt->last_lba;
+}
+
+/**
+ * fdisk_set_last_lba:
+ * @cxt: fdisk context
+ * @lba: last possible logical sector
+ *
+ * It's strongly recommended to use the default library setting. The last LBA
+ * is always reseted by fdisk_assign_device(), fdisk_override_geometry() and
+ * fdisk_reset_alignment().
+ *
+ * The default is number of sectors on the device, but maybe modified by the
+ * current disklabel driver (for example GPT uses and of disk for backup
+ * header, so last_lba is smaller than total number of sectors).
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+fdisk_sector_t fdisk_set_last_lba(struct fdisk_context *cxt, fdisk_sector_t lba)
+{
+ assert(cxt);
+
+ if (lba > cxt->total_sectors - 1 && lba < 1)
+ return -ERANGE;
+ cxt->last_lba = lba;
+ return 0;
+}
+
+
+/**
+ * fdisk_get_nsectors:
+ * @cxt: context
+ *
+ * Returns: size of the device in logical sectors.
+ */
+fdisk_sector_t fdisk_get_nsectors(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->total_sectors;
+}
+
+/**
+ * fdisk_get_devname:
+ * @cxt: context
+ *
+ * Returns: device name.
+ */
+const char *fdisk_get_devname(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->dev_path;
+}
+
+/**
+ * fdisk_get_devfd:
+ * @cxt: context
+ *
+ * Retruns: device file descriptor.
+ */
+int fdisk_get_devfd(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->dev_fd;
+}
+
+/**
+ * fdisk_get_geom_heads:
+ * @cxt: context
+ *
+ * Returns: number of geometry heads.
+ */
+unsigned int fdisk_get_geom_heads(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->geom.heads;
+}
+/**
+ * fdisk_get_geom_sectors:
+ * @cxt: context
+ *
+ * Returns: number of geometry sectors.
+ */
+fdisk_sector_t fdisk_get_geom_sectors(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->geom.sectors;
+
+}
+
+/**
+ * fdisk_get_geom_cylinders:
+ * @cxt: context
+ *
+ * Returns: number of geometry cylinders
+ */
+fdisk_sector_t fdisk_get_geom_cylinders(struct fdisk_context *cxt)
+{
+ assert(cxt);
+ return cxt->geom.cylinders;
+}
+
+int fdisk_missing_geometry(struct fdisk_context *cxt)
+{
+ int rc;
+
+ assert(cxt);
+
+ if (!cxt || !cxt->label)
+ return 0;
+
+ rc = (fdisk_label_require_geometry(cxt->label) &&
+ (!cxt->geom.heads || !cxt->geom.sectors
+ || !cxt->geom.cylinders));
+
+ if (rc && !fdisk_is_listonly(cxt))
+ fdisk_warnx(cxt, _("Incomplete geometry setting."));
+
+ return rc;
+}
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-03 14:50:18 +0200