353 lines
12 KiB
C
353 lines
12 KiB
C
/*
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fdisk.h
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*/
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#include "c.h"
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#define DEFAULT_SECTOR_SIZE 512
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#define MAX_SECTOR_SIZE 2048
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#define SECTOR_SIZE 512 /* still used in BSD code */
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#define MAXIMUM_PARTS 60
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#define ACTIVE_FLAG 0x80
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#define EXTENDED 0x05
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#define WIN98_EXTENDED 0x0f
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#define LINUX_PARTITION 0x81
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#define LINUX_SWAP 0x82
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#define LINUX_NATIVE 0x83
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#define LINUX_EXTENDED 0x85
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#define LINUX_LVM 0x8e
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#define LINUX_RAID 0xfd
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#define ALIGN_UP 1
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#define ALIGN_DOWN 2
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#define ALIGN_NEAREST 3
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#define LINE_LENGTH 800
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#define IS_EXTENDED(i) \
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((i) == EXTENDED || (i) == WIN98_EXTENDED || (i) == LINUX_EXTENDED)
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#define cround(n) (display_in_cyl_units ? ((n)/units_per_sector)+1 : (n))
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#define scround(x) (((x)+units_per_sector-1)/units_per_sector)
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/* fdisk debugging flags/options */
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#define FDISK_DEBUG_INIT (1 << 1)
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#define FDISK_DEBUG_CONTEXT (1 << 2)
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#define FDISK_DEBUG_TOPOLOGY (1 << 3)
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#define FDISK_DEBUG_GEOMETRY (1 << 4)
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#define FDISK_DEBUG_LABEL (1 << 5)
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#define FDISK_DEBUG_ALL 0xFFFF
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# define ON_DBG(m, x) do { \
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if ((FDISK_DEBUG_ ## m) & fdisk_debug_mask) { \
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x; \
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} \
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} while (0)
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# define DBG(m, x) do { \
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if ((FDISK_DEBUG_ ## m) & fdisk_debug_mask) { \
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fprintf(stderr, "%d: fdisk: %8s: ", getpid(), # m); \
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x; \
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} \
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} while (0)
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# define DBG_FLUSH do { \
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if (fdisk_debug_mask && \
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fdisk_debug_mask != FDISK_DEBUG_INIT) \
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fflush(stderr); \
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} while(0)
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static inline void __attribute__ ((__format__ (__printf__, 1, 2)))
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dbgprint(const char *mesg, ...)
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{
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va_list ap;
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va_start(ap, mesg);
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vfprintf(stderr, mesg, ap);
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va_end(ap);
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fputc('\n', stderr);
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}
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extern int fdisk_debug_mask;
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extern void fdisk_init_debug(int mask);
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struct partition {
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unsigned char boot_ind; /* 0x80 - active */
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unsigned char head; /* starting head */
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unsigned char sector; /* starting sector */
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unsigned char cyl; /* starting cylinder */
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unsigned char sys_ind; /* What partition type */
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unsigned char end_head; /* end head */
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unsigned char end_sector; /* end sector */
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unsigned char end_cyl; /* end cylinder */
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unsigned char start4[4]; /* starting sector counting from 0 */
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unsigned char size4[4]; /* nr of sectors in partition */
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} __attribute__ ((packed));
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enum menutype {
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MAIN_MENU,
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EXPERT_MENU,
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};
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enum failure {
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ioctl_error,
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unable_to_read,
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unable_to_seek,
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unable_to_write
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};
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typedef unsigned long long sector_t;
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/*
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* Supported partition table types (labels)
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*/
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enum fdisk_labeltype {
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FDISK_DISKLABEL_DOS = 1,
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FDISK_DISKLABEL_SUN = 2,
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FDISK_DISKLABEL_SGI = 4,
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FDISK_DISKLABEL_AIX = 8,
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FDISK_DISKLABEL_OSF = 16,
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FDISK_DISKLABEL_MAC = 32,
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FDISK_DISKLABEL_GPT = 64,
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FDISK_DISKLABEL_ANY = -1
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};
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/*
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* Partition types
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*/
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struct fdisk_parttype {
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unsigned int type; /* type as number or zero */
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const char *name; /* description */
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char *typestr; /* type as string or NULL */
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unsigned int flags; /* FDISK_PARTTYPE_* flags */
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};
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enum {
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FDISK_PARTTYPE_UNKNOWN = (1 << 1),
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FDISK_PARTTYPE_INVISIBLE = (1 << 2),
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FDISK_PARTTYPE_ALLOCATED = (1 << 3)
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};
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#define fdisk_parttype_is_unknown(_x) ((_x) && ((_x)->flags & FDISK_PARTTYPE_UNKNONW))
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#define fdisk_parttype_is_invisible(_x) ((_x) && ((_x)->flags & FDISK_PARTTYPE_INVISIBLE))
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#define fdisk_parttype_is_allocated(_x) ((_x) && ((_x)->flags & FDISK_PARTTYPE_ALLOCATED))
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/*
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* Legacy CHS based geometry
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*/
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struct fdisk_geometry {
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unsigned int heads;
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sector_t sectors;
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sector_t cylinders;
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};
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struct fdisk_context {
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int dev_fd; /* device descriptor */
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char *dev_path; /* device path */
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unsigned char *firstsector; /* buffer with master boot record */
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/* topology */
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unsigned long io_size; /* I/O size used by fdisk */
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unsigned long optimal_io_size; /* optional I/O returned by device */
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unsigned long min_io_size; /* minimal I/O size */
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unsigned long phy_sector_size; /* physical size */
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unsigned long sector_size; /* logical size */
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unsigned long alignment_offset;
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enum fdisk_labeltype disklabel; /* current disklabel */
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/* alignment */
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unsigned long grain; /* alignment unit */
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sector_t first_lba; /* recommended begin of the first partition */
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/* geometry */
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sector_t total_sectors; /* in logical sectors */
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struct fdisk_geometry geom;
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/* label operations and description */
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const struct fdisk_label *label;
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};
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#define fdisk_is_disklabel(c, x) fdisk_dev_is_disklabel(c, FDISK_DISKLABEL_ ## x)
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/*
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* Label specific operations
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*/
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struct fdisk_label {
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const char *name;
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/* array with partition types */
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struct fdisk_parttype *parttypes;
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size_t nparttypes; /* number of items in parttypes[] */
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/* probe disk label */
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int (*probe)(struct fdisk_context *cxt);
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/* write in-memory changes to disk */
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int (*write)(struct fdisk_context *cxt);
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/* verify the partition table */
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int (*verify)(struct fdisk_context *cxt);
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/* create new disk label */
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int (*create)(struct fdisk_context *cxt);
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/* new partition */
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int (*part_add)(struct fdisk_context *cxt, int partnum, struct fdisk_parttype *t);
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/* delete partition */
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int (*part_delete)(struct fdisk_context *cxt, int partnum);
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/* get partition type */
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struct fdisk_parttype *(*part_get_type)(struct fdisk_context *cxt, int partnum);
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/* set partition type */
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int (*part_set_type)(struct fdisk_context *cxt, int partnum, struct fdisk_parttype *t);
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/* refresh alignment setting */
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int (*reset_alignment)(struct fdisk_context *cxt);
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};
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/*
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* labels
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*/
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extern const struct fdisk_label aix_label;
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extern const struct fdisk_label dos_label;
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extern const struct fdisk_label bsd_label;
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extern const struct fdisk_label mac_label;
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extern const struct fdisk_label sun_label;
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extern const struct fdisk_label sgi_label;
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extern const struct fdisk_label gpt_label;
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extern struct fdisk_context *fdisk_new_context_from_filename(const char *fname, int readonly);
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extern int fdisk_dev_has_topology(struct fdisk_context *cxt);
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extern int fdisk_dev_has_disklabel(struct fdisk_context *cxt);
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extern int fdisk_dev_is_disklabel(struct fdisk_context *cxt, enum fdisk_labeltype l);
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extern int fdisk_dev_sectsz_is_default(struct fdisk_context *cxt);
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extern void fdisk_free_context(struct fdisk_context *cxt);
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extern void fdisk_zeroize_firstsector(struct fdisk_context *cxt);
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extern int fdisk_context_force_sector_size(struct fdisk_context *cxt, sector_t s);
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extern int fdisk_context_set_user_geometry(struct fdisk_context *cxt,
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unsigned int cylinders, unsigned int heads,
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unsigned int sectors);
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extern int fdisk_delete_partition(struct fdisk_context *cxt, int partnum);
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extern int fdisk_add_partition(struct fdisk_context *cxt, int partnum, struct fdisk_parttype *t);
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extern int fdisk_write_disklabel(struct fdisk_context *cxt);
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extern int fdisk_verify_disklabel(struct fdisk_context *cxt);
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extern int fdisk_create_disklabel(struct fdisk_context *cxt, const char *name);
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extern int fdisk_reset_alignment(struct fdisk_context *cxt);
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extern struct fdisk_parttype *fdisk_get_partition_type(struct fdisk_context *cxt, int partnum);
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extern int fdisk_set_partition_type(struct fdisk_context *cxt, int partnum,
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struct fdisk_parttype *t);
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extern size_t fdisk_get_nparttypes(struct fdisk_context *cxt);
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extern struct fdisk_parttype *fdisk_get_parttype_from_code(struct fdisk_context *cxt,
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unsigned int code);
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extern struct fdisk_parttype *fdisk_get_parttype_from_string(struct fdisk_context *cxt,
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const char *str);
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extern struct fdisk_parttype *fdisk_parse_parttype(struct fdisk_context *cxt, const char *str);
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extern struct fdisk_parttype *fdisk_new_unknown_parttype(unsigned int type, const char *typestr);
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extern void fdisk_free_parttype(struct fdisk_parttype *type);
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extern sector_t fdisk_topology_get_first_lba(struct fdisk_context *cxt);
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extern unsigned long fdisk_topology_get_grain(struct fdisk_context *cxt);
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/* prototypes for fdisk.c */
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extern char *line_ptr;
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extern int partitions;
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extern unsigned int display_in_cyl_units, units_per_sector;
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extern void check_consistency(struct fdisk_context *cxt, struct partition *p, int partition);
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extern void check_alignment(struct fdisk_context *cxt, sector_t lba, int partition);
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extern void check(struct fdisk_context *cxt, int n, unsigned int h, unsigned int s, unsigned int c, unsigned int start);
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extern void fatal(struct fdisk_context *cxt, enum failure why);
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extern int get_partition(struct fdisk_context *cxt, int warn, int max);
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extern void list_partition_types(struct fdisk_context *cxt);
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extern int read_line (int *asked);
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extern char read_char(char *mesg);
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extern struct fdisk_parttype *read_partition_type(struct fdisk_context *cxt);
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extern void reread_partition_table(struct fdisk_context *cxt, int leave);
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extern struct partition *get_part_table(int);
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extern unsigned int read_int(struct fdisk_context *cxt,
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unsigned int low, unsigned int dflt,
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unsigned int high, unsigned int base, char *mesg);
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extern void print_menu(struct fdisk_context *cxt, enum menutype menu);
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extern void print_partition_size(struct fdisk_context *cxt, int num, sector_t start, sector_t stop, int sysid);
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extern void fill_bounds(sector_t *first, sector_t *last);
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extern char *partition_type(struct fdisk_context *cxt, unsigned char type);
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extern char read_chars(char *mesg);
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extern void set_changed(int);
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extern void set_all_unchanged(void);
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extern int warn_geometry(struct fdisk_context *cxt);
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extern void warn_limits(struct fdisk_context *cxt);
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extern unsigned int read_int_with_suffix(struct fdisk_context *cxt,
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unsigned int low, unsigned int dflt, unsigned int high,
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unsigned int base, char *mesg, int *is_suffix_used);
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extern sector_t align_lba(struct fdisk_context *cxt, sector_t lba, int direction);
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extern sector_t align_lba_in_range(struct fdisk_context *cxt, sector_t lba, sector_t start, sector_t stop);
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extern int get_partition_dflt(struct fdisk_context *cxt, int warn, int max, int dflt);
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#define PLURAL 0
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#define SINGULAR 1
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extern const char * str_units(int);
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extern sector_t get_nr_sects(struct partition *p);
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extern int nowarn;
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extern int MBRbuffer_changed;
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/* start_sect and nr_sects are stored little endian on all machines */
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/* moreover, they are not aligned correctly */
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static inline void
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store4_little_endian(unsigned char *cp, unsigned int val) {
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cp[0] = (val & 0xff);
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cp[1] = ((val >> 8) & 0xff);
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cp[2] = ((val >> 16) & 0xff);
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cp[3] = ((val >> 24) & 0xff);
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}
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static inline unsigned int read4_little_endian(const unsigned char *cp)
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{
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return (unsigned int)(cp[0]) + ((unsigned int)(cp[1]) << 8)
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+ ((unsigned int)(cp[2]) << 16)
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+ ((unsigned int)(cp[3]) << 24);
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}
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static inline void set_nr_sects(struct partition *p, sector_t nr_sects)
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{
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store4_little_endian(p->size4, nr_sects);
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}
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static inline void set_start_sect(struct partition *p, unsigned int start_sect)
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{
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store4_little_endian(p->start4, start_sect);
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}
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static inline int seek_sector(struct fdisk_context *cxt, sector_t secno)
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{
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off_t offset = (off_t) secno * cxt->sector_size;
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return lseek(cxt->dev_fd, offset, SEEK_SET) == (off_t) -1 ? -errno : 0;
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}
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static inline int read_sector(struct fdisk_context *cxt, sector_t secno, unsigned char *buf)
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{
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int rc = seek_sector(cxt, secno);
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if (rc < 0)
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return rc;
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return read(cxt->dev_fd, buf, cxt->sector_size) !=
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(ssize_t) cxt->sector_size ? -errno : 0;
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}
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static inline sector_t get_start_sect(struct partition *p)
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{
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return read4_little_endian(p->start4);
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}
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static inline int is_cleared_partition(struct partition *p)
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{
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return !(!p || p->boot_ind || p->head || p->sector || p->cyl ||
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p->sys_ind || p->end_head || p->end_sector || p->end_cyl ||
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get_start_sect(p) || get_nr_sects(p));
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}
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