diff options
Diffstat (limited to 'libfdisk/src/dos.c')
| -rw-r--r-- | libfdisk/src/dos.c | 2912 |
1 files changed, 2912 insertions, 0 deletions
diff --git a/libfdisk/src/dos.c b/libfdisk/src/dos.c new file mode 100644 index 0000000..98bc614 --- /dev/null +++ b/libfdisk/src/dos.c @@ -0,0 +1,2912 @@ +/* + * + * Copyright (C) 2007-2013 Karel Zak <kzak@redhat.com> + * 2012 Davidlohr Bueso <dave@gnu.org> + * 2021 Pali Rohár <pali.rohar@gmail.com> + * + * This is re-written version for libfdisk, the original was fdiskdoslabel.c + * from util-linux fdisk. + */ +#include "c.h" +#include "randutils.h" +#include "pt-mbr.h" +#include "strutils.h" + +#include "fdiskP.h" + +#include <ctype.h> + +#define MAXIMUM_PARTS 60 +#define ACTIVE_FLAG 0x80 + +/** + * SECTION: dos + * @title: DOS + * @short_description: disk label specific functions + * + */ + + +#define IS_EXTENDED(i) \ + ((i) == MBR_DOS_EXTENDED_PARTITION \ + || (i) == MBR_W95_EXTENDED_PARTITION \ + || (i) == MBR_LINUX_EXTENDED_PARTITION) + +/* + * per partition table entry data + * + * The four primary partitions have the same sectorbuffer + * and have NULL ex_entry. + * + * Each logical partition table entry has two pointers, one for the + * partition and one link to the next one. + */ +struct pte { + struct dos_partition *pt_entry; /* on-disk MBR entry */ + struct dos_partition *ex_entry; /* on-disk EBR entry */ + fdisk_sector_t offset; /* disk sector number */ + unsigned char *sectorbuffer; /* disk sector contents */ + + unsigned int changed : 1, + private_sectorbuffer : 1; +}; + +/* + * in-memory fdisk GPT stuff + */ +struct fdisk_dos_label { + struct fdisk_label head; /* generic part */ + + struct pte ptes[MAXIMUM_PARTS]; /* partition */ + fdisk_sector_t ext_offset; /* start of the ext.partition */ + size_t ext_index; /* ext.partition index (if ext_offset is set) */ + unsigned int compatible : 1, /* is DOS compatible? */ + non_pt_changed : 1; /* MBR, but no PT changed */ +}; + +/* + * Partition types + */ +static struct fdisk_parttype dos_parttypes[] = { + #include "pt-mbr-partnames.h" +}; + +static const struct fdisk_shortcut dos_parttype_cuts[] = +{ + { .shortcut = "L", .alias = "linux", .data = "83" }, + { .shortcut = "S", .alias = "swap", .data = "82" }, + { .shortcut = "E", .alias = "extended", .data = "05", .deprecated = 1 }, /* collision with 0x0e type */ + { .shortcut = "Ex",.alias = "extended", .data = "05" }, /* MBR extended */ + { .shortcut = "U", .alias = "uefi", .data = "EF" }, /* UEFI system */ + { .shortcut = "R", .alias = "raid", .data = "FD" }, /* Linux RAID */ + { .shortcut = "V", .alias = "lvm", .data = "8E" }, /* LVM */ + { .shortcut = "X", .alias = "linuxex", .data = "85" } /* Linux extended */ +}; + + +#define sector(s) ((s) & 0x3f) +#define cylinder(s, c) ((c) | (((s) & 0xc0) << 2)) + +#define alignment_required(_x) ((_x)->grain != (_x)->sector_size) + +#define is_dos_compatible(_x) \ + (fdisk_is_label(_x, DOS) && \ + fdisk_dos_is_compatible(fdisk_get_label(_x, NULL))) + +#define cround(c, n) fdisk_cround(c, n) + + +static inline struct fdisk_dos_label *self_label(struct fdisk_context *cxt) +{ + assert(cxt); + assert(cxt->label); + assert(fdisk_is_label(cxt, DOS)); + + return (struct fdisk_dos_label *) cxt->label; +} + +static inline struct pte *self_pte(struct fdisk_context *cxt, size_t i) +{ + struct fdisk_dos_label *l = self_label(cxt); + + if (i >= ARRAY_SIZE(l->ptes)) + return NULL; + + return &l->ptes[i]; +} + +static inline struct dos_partition *self_partition( + struct fdisk_context *cxt, + size_t i) +{ + struct pte *pe = self_pte(cxt, i); + return pe ? pe->pt_entry : NULL; +} + +struct dos_partition *fdisk_dos_get_partition( + struct fdisk_context *cxt, + size_t i) +{ + assert(cxt); + assert(cxt->label); + assert(fdisk_is_label(cxt, DOS)); + + return self_partition(cxt, i); +} + +static struct fdisk_parttype *dos_partition_parttype( + struct fdisk_context *cxt, + struct dos_partition *p) +{ + struct fdisk_parttype *t + = fdisk_label_get_parttype_from_code(cxt->label, p->sys_ind); + return t ? : fdisk_new_unknown_parttype(p->sys_ind, NULL); +} + +/* + * Linux kernel cares about partition size only. Things like + * partition type or so are completely irrelevant -- kzak Nov-2013 + */ +static int is_used_partition(struct dos_partition *p) +{ + return p && dos_partition_get_size(p) != 0; +} + +static void partition_set_changed( + struct fdisk_context *cxt, + size_t i, + int changed) +{ + struct pte *pe = self_pte(cxt, i); + + if (!pe) + return; + + DBG(LABEL, ul_debug("DOS: setting %zu partition to %s", i, + changed ? "changed" : "unchanged")); + + pe->changed = changed ? 1 : 0; + if (changed) + fdisk_label_set_changed(cxt->label, 1); +} + +static fdisk_sector_t get_abs_partition_start(struct pte *pe) +{ + assert(pe); + assert(pe->pt_entry); + + return pe->offset + dos_partition_get_start(pe->pt_entry); +} + +static fdisk_sector_t get_abs_partition_end(struct pte *pe) +{ + fdisk_sector_t size; + + assert(pe); + assert(pe->pt_entry); + + size = dos_partition_get_size(pe->pt_entry); + return get_abs_partition_start(pe) + size - (size ? 1 : 0); +} + +static int is_cleared_partition(struct dos_partition *p) +{ + return !(!p || p->boot_ind || p->bh || p->bs || p->bc || + p->sys_ind || p->eh || p->es || p->ec || + dos_partition_get_start(p) || dos_partition_get_size(p)); +} + +static int get_partition_unused_primary(struct fdisk_context *cxt, + struct fdisk_partition *pa, + size_t *partno) +{ + size_t org, n; + int rc; + + assert(cxt); + assert(cxt->label); + assert(partno); + + org = cxt->label->nparts_max; + + cxt->label->nparts_max = 4; + rc = fdisk_partition_next_partno(pa, cxt, &n); + cxt->label->nparts_max = org; + + if (rc == 1) { + fdisk_info(cxt, _("All primary partitions have been defined already.")); + rc = -1; + } else if (rc == -ERANGE) { + fdisk_warnx(cxt, _("Primary partition not available.")); + } else if (rc == 0) + *partno = n; + + return rc; +} + +static int seek_sector(struct fdisk_context *cxt, fdisk_sector_t secno) +{ + off_t offset = (off_t) secno * cxt->sector_size; + + return lseek(cxt->dev_fd, offset, SEEK_SET) == (off_t) -1 ? -errno : 0; +} + +static int read_sector(struct fdisk_context *cxt, fdisk_sector_t secno, + unsigned char *buf) +{ + int rc = seek_sector(cxt, secno); + ssize_t r; + + if (rc < 0) + return rc; + + r = read(cxt->dev_fd, buf, cxt->sector_size); + if (r == (ssize_t) cxt->sector_size) + return 0; + if (r < 0) + return -errno; + return -1; +} + +/* Allocate a buffer and read a partition table sector */ +static int read_pte(struct fdisk_context *cxt, size_t pno, fdisk_sector_t offset) +{ + int rc; + unsigned char *buf; + struct pte *pe = self_pte(cxt, pno); + + if (!pe) + return -EINVAL; + + buf = calloc(1, cxt->sector_size); + if (!buf) + return -ENOMEM; + + DBG(LABEL, ul_debug("DOS: reading EBR %zu: offset=%ju, buffer=%p", + pno, (uintmax_t) offset, buf)); + + pe->offset = offset; + pe->sectorbuffer = buf; + pe->private_sectorbuffer = 1; + + rc = read_sector(cxt, offset, pe->sectorbuffer); + if (rc) { + fdisk_warn(cxt, _("Failed to read extended partition table " + "(offset=%ju)"), (uintmax_t) offset); + return rc; + } + + pe->changed = 0; + pe->pt_entry = pe->ex_entry = NULL; + return 0; +} + + +static void clear_partition(struct dos_partition *p) +{ + if (!p) + return; + p->boot_ind = 0; + p->bh = 0; + p->bs = 0; + p->bc = 0; + p->sys_ind = 0; + p->eh = 0; + p->es = 0; + p->ec = 0; + dos_partition_set_start(p,0); + dos_partition_set_size(p,0); +} + +static void dos_init(struct fdisk_context *cxt) +{ + struct fdisk_dos_label *l = self_label(cxt); + size_t i; + + assert(cxt); + assert(cxt->label); + assert(fdisk_is_label(cxt, DOS)); + + DBG(LABEL, ul_debug("DOS: initialize, first sector buffer %p", cxt->firstsector)); + + cxt->label->nparts_max = 4; /* default, unlimited number of logical */ + + l->ext_index = 0; + l->ext_offset = 0; + l->non_pt_changed = 0; + + memset(l->ptes, 0, sizeof(l->ptes)); + + for (i = 0; i < 4; i++) { + struct pte *pe = self_pte(cxt, i); + + assert(pe); + pe->pt_entry = mbr_get_partition(cxt->firstsector, i); + pe->ex_entry = NULL; + pe->offset = 0; + pe->sectorbuffer = cxt->firstsector; + pe->private_sectorbuffer = 0; + pe->changed = 0; + + DBG(LABEL, ul_debug("DOS: initialize: #%zu start=%u size=%u sysid=%02x", + i, + dos_partition_get_start(pe->pt_entry), + dos_partition_get_size(pe->pt_entry), + pe->pt_entry->sys_ind)); + } + + if (fdisk_is_listonly(cxt)) + return; + /* + * Various warnings... + */ + if (fdisk_missing_geometry(cxt)) + fdisk_warnx(cxt, _("You can set geometry from the extra functions menu.")); + + if (is_dos_compatible(cxt)) { + fdisk_warnx(cxt, _("DOS-compatible mode is deprecated.")); + + if (cxt->sector_size != cxt->phy_sector_size) + fdisk_info(cxt, _( + "The device presents a logical sector size that is smaller than " + "the physical sector size. Aligning to a physical sector (or optimal " + "I/O) size boundary is recommended, or performance may be impacted.")); + } + + if (fdisk_use_cylinders(cxt)) + fdisk_warnx(cxt, _("Cylinders as display units are deprecated.")); + + if (cxt->total_sectors > UINT_MAX) { + uint64_t bytes = cxt->total_sectors * cxt->sector_size; + char *szstr = size_to_human_string(SIZE_SUFFIX_SPACE + | SIZE_SUFFIX_3LETTER, bytes); + fdisk_warnx(cxt, + _("The size of this disk is %s (%ju bytes). DOS " + "partition table format cannot be used on drives for " + "volumes larger than %lu bytes for %lu-byte " + "sectors. Use GUID partition table format (GPT)."), + szstr, bytes, + UINT_MAX * cxt->sector_size, + cxt->sector_size); + free(szstr); + } +} + +/* callback called by libfdisk */ +static void dos_deinit(struct fdisk_label *lb) +{ + size_t i; + struct fdisk_dos_label *l = (struct fdisk_dos_label *) lb; + + for (i = 0; i < ARRAY_SIZE(l->ptes); i++) { + struct pte *pe = &l->ptes[i]; + + if (pe->private_sectorbuffer && pe->sectorbuffer) { + DBG(LABEL, ul_debug("DOS: freeing pte %zu sector buffer %p", + i, pe->sectorbuffer)); + free(pe->sectorbuffer); + } + pe->sectorbuffer = NULL; + pe->private_sectorbuffer = 0; + } + + memset(l->ptes, 0, sizeof(l->ptes)); +} + +static void reset_pte(struct pte *pe) +{ + assert(pe); + + if (pe->private_sectorbuffer) { + DBG(LABEL, ul_debug(" --> freeing pte sector buffer %p", + pe->sectorbuffer)); + free(pe->sectorbuffer); + } + memset(pe, 0, sizeof(struct pte)); +} + +static int delete_partition(struct fdisk_context *cxt, size_t partnum) +{ + struct fdisk_dos_label *l; + struct pte *pe; + struct dos_partition *p; + struct dos_partition *q; + + assert(cxt); + assert(cxt->label); + assert(fdisk_is_label(cxt, DOS)); + + pe = self_pte(cxt, partnum); + if (!pe) + return -EINVAL; + + DBG(LABEL, ul_debug("DOS: delete partition %zu (max=%zu)", partnum, + cxt->label->nparts_max)); + + l = self_label(cxt); + p = pe->pt_entry; + q = pe->ex_entry; + + /* Note that for the fifth partition (partnum == 4) we don't actually + decrement partitions. */ + if (partnum < 4) { + DBG(LABEL, ul_debug("--> delete primary")); + if (IS_EXTENDED(p->sys_ind) && partnum == l->ext_index) { + size_t i; + DBG(LABEL, ul_debug(" --> delete extended")); + for (i = 4; i < cxt->label->nparts_max; i++) { + DBG(LABEL, ul_debug(" --> delete logical #%zu", i)); + reset_pte(&l->ptes[i]); + + } + cxt->label->nparts_max = 4; + l->ptes[l->ext_index].ex_entry = NULL; + l->ext_offset = 0; + l->ext_index = 0; + } + partition_set_changed(cxt, partnum, 1); + clear_partition(p); + } else if (!q->sys_ind && partnum > 4) { + DBG(LABEL, ul_debug("--> delete logical [last in the chain]")); + reset_pte(&l->ptes[partnum]); + --cxt->label->nparts_max; + --partnum; + /* clear link to deleted partition */ + clear_partition(l->ptes[partnum].ex_entry); + partition_set_changed(cxt, partnum, 1); + } else { + DBG(LABEL, ul_debug("--> delete logical [move down]")); + if (partnum > 4) { + DBG(LABEL, ul_debug(" --> delete %zu logical link", partnum)); + p = l->ptes[partnum - 1].ex_entry; + *p = *q; + dos_partition_set_start(p, dos_partition_get_start(q)); + dos_partition_set_size(p, dos_partition_get_size(q)); + dos_partition_sync_chs(p, pe->offset, cxt->geom.sectors, cxt->geom.heads); + partition_set_changed(cxt, partnum - 1, 1); + + } else if (cxt->label->nparts_max > 5) { + DBG(LABEL, ul_debug(" --> delete first logical link")); + pe = &l->ptes[5]; /* second logical */ + + if (pe->pt_entry) /* prevent SEGFAULT */ + dos_partition_set_start(pe->pt_entry, + get_abs_partition_start(pe) - + l->ext_offset); + pe->offset = l->ext_offset; + dos_partition_sync_chs(p, pe->offset, cxt->geom.sectors, cxt->geom.heads); + partition_set_changed(cxt, 5, 1); + } + + if (cxt->label->nparts_max > 5) { + DBG(LABEL, ul_debug(" --> move ptes")); + cxt->label->nparts_max--; + reset_pte(&l->ptes[partnum]); + while (partnum < cxt->label->nparts_max) { + DBG(LABEL, ul_debug(" --> moving pte %zu <-- %zu", partnum, partnum + 1)); + l->ptes[partnum] = l->ptes[partnum + 1]; + partnum++; + } + memset(&l->ptes[partnum], 0, sizeof(struct pte)); + } else { + DBG(LABEL, ul_debug(" --> the only logical: clear only")); + clear_partition(l->ptes[partnum].pt_entry); + cxt->label->nparts_max--; + + if (partnum == 4) { + DBG(LABEL, ul_debug(" --> clear last logical")); + reset_pte(&l->ptes[partnum]); + partition_set_changed(cxt, l->ext_index, 1); + } + } + } + + fdisk_label_set_changed(cxt->label, 1); + return 0; +} + +static int dos_delete_partition(struct fdisk_context *cxt, size_t partnum) +{ + struct pte *pe; + + assert(cxt); + assert(cxt->label); + assert(fdisk_is_label(cxt, DOS)); + + pe = self_pte(cxt, partnum); + if (!pe || !is_used_partition(pe->pt_entry)) + return -EINVAL; + + return delete_partition(cxt, partnum); +} + +static void read_extended(struct fdisk_context *cxt, size_t ext) +{ + size_t i; + struct pte *pex, *pe; + struct dos_partition *p, *q; + struct fdisk_dos_label *l = self_label(cxt); + + l->ext_index = ext; + pex = self_pte(cxt, ext); + if (!pex) { + DBG(LABEL, ul_debug("DOS: uninitialized pointer to %zu pex", ext)); + return; + } + pex->ex_entry = pex->pt_entry; + + p = pex->pt_entry; + if (!dos_partition_get_start(p)) { + fdisk_warnx(cxt, _("Bad offset in primary extended partition.")); + return; + } + + DBG(LABEL, ul_debug("DOS: Reading extended %zu", ext)); + + while (IS_EXTENDED (p->sys_ind)) { + if (cxt->label->nparts_max >= MAXIMUM_PARTS) { + /* This is not a Linux restriction, but + this program uses arrays of size MAXIMUM_PARTS. + Do not try to `improve' this test. */ + struct pte *pre = self_pte(cxt, + cxt->label->nparts_max - 1); + fdisk_warnx(cxt, + _("Omitting partitions after #%zu. They will be deleted " + "if you save this partition table."), + cxt->label->nparts_max); + + if (pre) { + clear_partition(pre->ex_entry); + partition_set_changed(cxt, + cxt->label->nparts_max - 1, 1); + } + return; + } + + pe = self_pte(cxt, cxt->label->nparts_max); + if (!pe) + return; + + if (read_pte(cxt, cxt->label->nparts_max, l->ext_offset + + dos_partition_get_start(p))) + return; + + if (!l->ext_offset) + l->ext_offset = dos_partition_get_start(p); + + assert(pe->sectorbuffer); + q = p = mbr_get_partition(pe->sectorbuffer, 0); + + for (i = 0; i < 4; i++, p++) { + if (!dos_partition_get_size(p)) + continue; + + if (IS_EXTENDED (p->sys_ind)) { + if (pe->ex_entry) + fdisk_warnx(cxt, _( + "Extra link pointer in partition " + "table %zu."), + cxt->label->nparts_max + 1); + else + pe->ex_entry = p; + } else if (p->sys_ind) { + if (pe->pt_entry) + fdisk_warnx(cxt, _( + "Ignoring extra data in partition " + "table %zu."), + cxt->label->nparts_max + 1); + else + pe->pt_entry = p; + } + } + + /* very strange code here... */ + if (!pe->pt_entry) { + if (q != pe->ex_entry) + pe->pt_entry = q; + else + pe->pt_entry = q + 1; + } + if (!pe->ex_entry) { + if (q != pe->pt_entry) + pe->ex_entry = q; + else + pe->ex_entry = q + 1; + } + + p = pe->ex_entry; + cxt->label->nparts_cur = ++cxt->label->nparts_max; + + DBG(LABEL, ul_debug("DOS: EBR[offset=%ju]: link: type=%x, start=%u, size=%u; " + " data: type=%x, start=%u, size=%u", + (uintmax_t) pe->offset, + pe->ex_entry->sys_ind, + dos_partition_get_start(pe->ex_entry), + dos_partition_get_size(pe->ex_entry), + pe->pt_entry->sys_ind, + dos_partition_get_start(pe->pt_entry), + dos_partition_get_size(pe->pt_entry))); + + } + + /* remove last empty EBR */ + pe = self_pte(cxt, cxt->label->nparts_max - 1); + if (pe && + is_cleared_partition(pe->ex_entry) && + is_cleared_partition(pe->pt_entry)) { + DBG(LABEL, ul_debug("DOS: EBR[offset=%ju]: empty, remove", (uintmax_t) pe->offset)); + reset_pte(pe); + cxt->label->nparts_max--; + cxt->label->nparts_cur--; + } + + /* remove empty links */ + remove: + q = self_partition(cxt, 4); + for (i = 4; i < cxt->label->nparts_max; i++) { + p = self_partition(cxt, i); + + if (p && !dos_partition_get_size(p) && + (cxt->label->nparts_max > 5 || (q && q->sys_ind))) { + fdisk_info(cxt, _("omitting empty partition (%zu)"), i+1); + delete_partition(cxt, i); + goto remove; /* numbering changed */ + } + } + + DBG(LABEL, ul_debug("DOS: nparts_max: %zu", cxt->label->nparts_max)); +} + +static int dos_create_disklabel(struct fdisk_context *cxt) +{ + unsigned int id = 0; + int rc, has_id = 0; + struct fdisk_dos_label *l; + + assert(cxt); + assert(cxt->label); + assert(fdisk_is_label(cxt, DOS)); + + DBG(LABEL, ul_debug("DOS: creating new disklabel")); + + if (cxt->script) { + char *end = NULL; + const char *s = fdisk_script_get_header(cxt->script, "label-id"); + + if (s) { + errno = 0; + id = strtoul(s, &end, 16); + if (!errno && end && s < end) { + has_id = 1; + DBG(LABEL, ul_debug("DOS: re-use ID from script (0x%08x)", id)); + } else + DBG(LABEL, ul_debug("DOS: failed to parse label=id '%s'", s)); + } + } + + /* random disk signature */ + if (!has_id) { + DBG(LABEL, ul_debug("DOS: generate new ID")); + ul_random_get_bytes(&id, sizeof(id)); + } + + if (fdisk_has_protected_bootbits(cxt)) + rc = fdisk_init_firstsector_buffer(cxt, 0, MBR_PT_BOOTBITS_SIZE); + else + rc = fdisk_init_firstsector_buffer(cxt, 0, 0); + if (rc) + return rc; + dos_init(cxt); + + l = self_label(cxt); + + /* Generate an MBR ID for this disk */ + mbr_set_id(cxt->firstsector, id); + l->non_pt_changed = 1; + fdisk_label_set_changed(cxt->label, 1); + + /* Put MBR signature */ + mbr_set_magic(cxt->firstsector); + + fdisk_info(cxt, _("Created a new DOS disklabel with disk " + "identifier 0x%08x."), id); + return 0; +} + +static int dos_set_disklabel_id(struct fdisk_context *cxt, const char *str) +{ + char *buf = NULL; + unsigned int id, old; + struct fdisk_dos_label *l; + int rc = 0; + + assert(cxt); + assert(cxt->label); + assert(fdisk_is_label(cxt, DOS)); + + DBG(LABEL, ul_debug("DOS: setting Id")); + + l = self_label(cxt); + old = mbr_get_id(cxt->firstsector); + + if (!str) { + rc = fdisk_ask_string(cxt, + _("Enter the new disk identifier"), &buf); + str = buf; + } + if (!rc) { + char *end = NULL; + + errno = 0; + id = strtoul(str, &end, 0); + if (errno || str == end || (end && *end)) { + fdisk_warnx(cxt, _("Incorrect value.")); + rc = -EINVAL; + } + } + + free(buf); + if (rc) + return -EINVAL; + + mbr_set_id(cxt->firstsector, id); + l->non_pt_changed = 1; + fdisk_label_set_changed(cxt->label, 1); + + fdisk_info(cxt, _("Disk identifier changed from 0x%08x to 0x%08x."), + old, id); + return 0; +} + +static unsigned int chs_div_minus(unsigned int a1, unsigned int a2, unsigned int b1, unsigned int b2) +{ + if (a1 > a2 && b1 > b2) { + a1 = a1 - a2; + b1 = b1 - b2; + } else if (a2 > a1 && b2 > b1) { + a1 = a2 - a1; + b1 = b2 - b1; + } else { + return 0; + } + if (a1 % b1) + return 0; + return a1 / b1; +} + +static inline int chs_overflowed(unsigned int c, unsigned int h, unsigned int s) +{ + /* 1023/254/63 or 1023/255/63 indicates overflowed/invalid C/H/S values */ + return (c == 1023 && (h == 254 || h == 255) && s == 63); +} + +static inline int lba_overflowed(fdisk_sector_t start, fdisk_sector_t sects) +{ + /* Check if the last LBA sector can be represented by unsigned 32bit int */ + return (start + (sects-1) > UINT32_MAX); +} + +static void get_partition_table_geometry(struct fdisk_context *cxt, + unsigned int *ph, unsigned int *ps) +{ + unsigned char *bufp = cxt->firstsector; + struct { unsigned int c, h, o, v; } t[8]; + unsigned int n1, n2, n3, n4, n5, n6; + struct dos_partition *p; + unsigned int c, h, s, l; + unsigned int hh, ss; + unsigned int sects; + int i, j, dif; + +#define chs_set_t(c, h, s, l, t, i) do { \ + t[i].c = c; \ + t[i].h = h; \ + t[i].o = l - (s-1); \ + t[i].v = (!chs_overflowed(c, h, s) && s && s-1 <= l); \ +} while (0) + + /* + * Conversion from C/H/S to LBA is defined by formula: + * LBA = (c * N_heads + h) * N_sectors + (s - 1) + * Let o to be: + * o = LBA - (s - 1) + * Then formula can be expressed as: + * o = (c * N_heads + h) * N_sectors + * In general from two tuples (LBA1, c1, h1, s1), (LBA2, c2, h2, s2) + * we can derive formulas for N_heads and N_sectors: + * N_heads = (o1 * h2 - o2 * h1) / (o2 * c1 - o1 * c2) + * N_sectors = (o2 * c1 - o1 * c2) / (c1 * h2 - c2 * h1) + * MBR table contains for very partition start and end tuple. + * So we have up to 8 tuples which leads to up to 28 equations + * for calculating N_heads and N_sectors. Try to calculate + * N_heads and N_sectors from the first possible partition and + * if it fails then try also mixed tuples (beginning from first + * partition and end from second). Calculation may fail if both + * first and last sectors are on cylinder or head boundary + * (dividend or divisor is zero). It is possible that different + * partitions would have different C/H/S geometry. In this case + * we want geometry from the first partition as in most cases + * this partition is or was used by BIOS for booting. + */ + + hh = ss = 0; + for (i = 0; i < 4; i++) { + p = mbr_get_partition(bufp, i); + if (!p->sys_ind) + continue; + + c = cylinder(p->bs, p->bc); + h = p->bh; + s = sector(p->bs); + l = dos_partition_get_start(p); + chs_set_t(c, h, s, l, t, 2*i); + + sects = dos_partition_get_size(p); + if (!sects || lba_overflowed(l, sects)) + continue; + + c = cylinder(p->es, p->ec); + h = p->eh; + s = sector(p->es); + l += sects-1; + chs_set_t(c, h, s, l, t, 2*i+1); + } + + for (dif = 1; dif < 8; dif++) { + for (i = 0; i + dif < 8; i++) { + j = i + dif; + if (!t[i].v || !t[j].v) + continue; + n1 = t[i].o * t[j].h; + n2 = t[j].o * t[i].h; + n3 = t[j].o * t[i].c; + n4 = t[i].o * t[j].c; + n5 = t[i].c * t[j].h; + n6 = t[j].c * t[i].h; + if (!hh && n1 != n2 && n3 != n4) { + h = chs_div_minus(n1, n2, n3, n4); + if (h > 0 && h <= 256) + hh = h; + } + if (!ss && n3 != n4 && n5 != n6) { + s = chs_div_minus(n3, n4, n5, n6); + if (s > 0 && s <= 63) + ss = s; + } + if (hh && ss) + break; + } + if (hh && ss) + break; + } + + if (hh && ss) { + *ph = hh; + *ps = ss; + } + + DBG(LABEL, ul_debug("DOS PT geometry: heads=%u, sectors=%u", *ph, *ps)); +} + +static int dos_reset_alignment(struct fdisk_context *cxt) +{ + assert(cxt); + assert(cxt->label); + assert(fdisk_is_label(cxt, DOS)); + + /* overwrite necessary stuff by DOS deprecated stuff */ + if (is_dos_compatible(cxt)) { + DBG(LABEL, ul_debug("DOS: resetting alignment for DOS-compatible PT")); + if (cxt->geom.sectors) + cxt->first_lba = cxt->geom.sectors; /* usually 63 */ + + cxt->grain = cxt->sector_size; /* usually 512 */ + } + + return 0; +} + +/* TODO: move to include/pt-dos.h and share with libblkid */ +#define AIX_MAGIC_STRING "\xC9\xC2\xD4\xC1" +#define AIX_MAGIC_STRLEN (sizeof(AIX_MAGIC_STRING) - 1) + +static int dos_probe_label(struct fdisk_context *cxt) +{ + size_t i; + unsigned int h = 0, s = 0; + + assert(cxt); + assert(cxt->label); + assert(fdisk_is_label(cxt, DOS)); + + /* ignore disks with AIX magic number */ + if (memcmp(cxt->firstsector, AIX_MAGIC_STRING, AIX_MAGIC_STRLEN) == 0) + return 0; + + if (!mbr_is_valid_magic(cxt->firstsector)) + return 0; + + dos_init(cxt); + + get_partition_table_geometry(cxt, &h, &s); + if (h && s) { + cxt->geom.heads = h; + cxt->geom.sectors = s; + cxt->geom.cylinders = cxt->total_sectors / + (cxt->geom.heads * cxt->geom.sectors); + + if (fdisk_has_user_device_geometry(cxt)) + fdisk_apply_user_device_properties(cxt); + } + + for (i = 0; i < 4; i++) { + struct pte *pe = self_pte(cxt, i); + + assert(pe); + if (is_used_partition(pe->pt_entry)) + cxt->label->nparts_cur++; + + if (IS_EXTENDED (pe->pt_entry->sys_ind)) { + if (cxt->label->nparts_max != 4) + fdisk_warnx(cxt, _( + "Ignoring extra extended partition %zu"), + i + 1); + else + read_extended(cxt, i); + } + } + + for (i = 3; i < cxt->label->nparts_max; i++) { + struct pte *pe = self_pte(cxt, i); + struct fdisk_dos_label *l = self_label(cxt); + + assert(pe); + if (!mbr_is_valid_magic(pe->sectorbuffer)) { + fdisk_info(cxt, _( + "Invalid flag 0x%02x%02x of EBR (for partition %zu) will " + "be corrected by w(rite)."), + pe->sectorbuffer[510], + pe->sectorbuffer[511], + i + 1); + partition_set_changed(cxt, i, 1); + + /* mark also extended as changed to update the first EBR + * in situation that there is no logical partitions at all */ + partition_set_changed(cxt, l->ext_index, 1); + } + } + + return 1; +} + +static void set_partition(struct fdisk_context *cxt, + int i, int doext, fdisk_sector_t start, + fdisk_sector_t stop, int sysid, int boot) +{ + struct pte *pe = self_pte(cxt, i); + struct dos_partition *p; + fdisk_sector_t offset; + + assert(!FDISK_IS_UNDEF(start)); + assert(!FDISK_IS_UNDEF(stop)); + assert(pe); + + if (doext) { + struct fdisk_dos_label *l = self_label(cxt); + p = pe->ex_entry; + offset = l->ext_offset; + } else { + p = pe->pt_entry; + offset = pe->offset; + } + + DBG(LABEL, ul_debug("DOS: setting partition %d%s, offset=%zu, start=%zu, size=%zu, sysid=%02x", + i, doext ? " [extended]" : "", + (size_t) offset, + (size_t) (start - offset), + (size_t) (stop - start + 1), + sysid)); + + p->boot_ind = boot ? ACTIVE_FLAG : 0; + p->sys_ind = sysid; + dos_partition_set_start(p, start - offset); + dos_partition_set_size(p, stop - start + 1); + dos_partition_sync_chs(p, offset, cxt->geom.sectors, cxt->geom.heads); + partition_set_changed(cxt, i, 1); +} + + +static int get_start_from_user( struct fdisk_context *cxt, + fdisk_sector_t *start, + fdisk_sector_t low, + fdisk_sector_t dflt, + fdisk_sector_t limit, + struct fdisk_partition *pa) +{ + assert(start); + + /* try to use template from 'pa' */ + if (pa && pa->start_follow_default) + *start = dflt; + + else if (pa && fdisk_partition_has_start(pa)) { + DBG(LABEL, ul_debug("DOS: start: wanted=%ju, low=%ju, limit=%ju", + (uintmax_t) pa->start, (uintmax_t) low, (uintmax_t) limit)); + *start = pa->start; + if (*start < low || *start > limit) { + fdisk_warnx(cxt, _("Start sector %ju out of range."), + (uintmax_t) *start); + return -ERANGE; + } + } else { + /* ask user by dialog */ + struct fdisk_ask *ask = fdisk_new_ask(); + int rc; + + if (!ask) + return -ENOMEM; + fdisk_ask_set_query(ask, + fdisk_use_cylinders(cxt) ? + _("First cylinder") : _("First sector")); + fdisk_ask_set_type(ask, FDISK_ASKTYPE_NUMBER); + fdisk_ask_number_set_low(ask, fdisk_cround(cxt, low)); + fdisk_ask_number_set_default(ask, fdisk_cround(cxt, dflt)); + fdisk_ask_number_set_high(ask, fdisk_cround(cxt, limit)); + + rc = fdisk_do_ask(cxt, ask); + *start = fdisk_ask_number_get_result(ask); + fdisk_unref_ask(ask); + if (rc) + return rc; + if (fdisk_use_cylinders(cxt)) { + *start = (*start - 1) + * fdisk_get_units_per_sector(cxt); + if (*start < low) + *start = low; + } + } + + DBG(LABEL, ul_debug("DOS: start is %ju", (uintmax_t) *start)); + return 0; +} + +/* Returns last available sector in the free space pointed to by start. */ +static int find_last_free( + struct fdisk_context *cxt, + int logical, + fdisk_sector_t begin, + fdisk_sector_t stop, + fdisk_sector_t *result) +{ + fdisk_sector_t last = stop; + + size_t i = logical ? 4 : 0; + + for ( ; i < cxt->label->nparts_max; i++) { + struct pte *pe = self_pte(cxt, i); + + assert(pe); + fdisk_sector_t p_start = get_abs_partition_start(pe); + fdisk_sector_t p_end = get_abs_partition_end(pe); + + if (is_cleared_partition(pe->pt_entry)) + continue; + /* count EBR and begin of the logical partition as used area */ + if (pe->offset) + p_start -= cxt->first_lba; + + if ((p_start >= begin && p_start <= last) || + (p_end >= begin && p_end <= last)) { + last = p_start - 1; + } + if (last < begin) { + DBG(LABEL, ul_debug("no free space <%ju,%ju>", + (uintmax_t) begin, (uintmax_t) stop)); + return -ENOSPC; + } + } + + if (last == begin) + last = stop; + + DBG(LABEL, ul_debug("DOS: last free sector <%ju,%ju>: %ju", + (uintmax_t) begin, (uintmax_t) stop, (uintmax_t) last)); + + *result = last; + return 0; +} + +static int find_last_free_sector_in_range( + struct fdisk_context *cxt, + int logical, + fdisk_sector_t begin, + fdisk_sector_t end, + fdisk_sector_t *result) +{ + int last_moved; + fdisk_sector_t last = end; + + do { + size_t i = logical ? 4 : 0; + + last_moved = 0; + for ( ; i < cxt->label->nparts_max; i++) { + struct pte *pe = self_pte(cxt, i); + + assert(pe); + fdisk_sector_t p_start = get_abs_partition_start(pe); + fdisk_sector_t p_end = get_abs_partition_end(pe); + + if (is_cleared_partition(pe->pt_entry)) + continue; + + /* count EBR and begin of the logical partition as used area */ + if (pe->offset) + p_start -= cxt->first_lba; + + if (last >= p_start && last <= p_end) { + last = p_start - 1; + last_moved = 1; + + if (last < begin) { + DBG(LABEL, ul_debug("DOS: last free out of range <%ju,%ju>: %ju", + (uintmax_t) begin, (uintmax_t) end, (uintmax_t) last)); + + return -ENOSPC; + } + } + } + } while (last_moved == 1); + + DBG(LABEL, ul_debug("DOS: last unused sector in range <%ju,%ju>: %ju", + (uintmax_t) begin, (uintmax_t) end, (uintmax_t) last)); + + *result = last; + return 0; +} + +static int find_first_free_sector_in_range( + struct fdisk_context *cxt, + int logical, + fdisk_sector_t begin, + fdisk_sector_t end, + fdisk_sector_t *result) +{ + int first_moved = 0; + fdisk_sector_t first = begin; + + do { + size_t i = logical ? 4 : 0; + + first_moved = 0; + for (; i < cxt->label->nparts_max; i++) { + struct pte *pe = self_pte(cxt, i); + + assert(pe); + fdisk_sector_t p_start = get_abs_partition_start(pe); + fdisk_sector_t p_end = get_abs_partition_end(pe); + + if (is_cleared_partition(pe->pt_entry)) + continue; + /* count EBR and begin of the logical partition as used area */ + if (pe->offset) + p_start -= cxt->first_lba; + if (first < p_start) + continue; + if (first <= p_end) { + first = p_end + 1 + (logical ? cxt->first_lba : 0); + first_moved = 1; + + if (first > end) { + DBG(LABEL, ul_debug("DOS: first free out of range <%ju,%ju>: %ju", + (uintmax_t) begin, (uintmax_t) end, (uintmax_t) first)); + return -ENOSPC; + } + } + } + } while (first_moved == 1); + + DBG(LABEL, ul_debug("DOS: first unused sector in range <%ju,%ju>: %ju", + (uintmax_t) begin, (uintmax_t) end, (uintmax_t) first)); + *result = first; + return 0; +} + +static int get_disk_ranges(struct fdisk_context *cxt, int logical, + fdisk_sector_t *first, fdisk_sector_t *last) +{ + if (logical) { + /* logical partitions */ + struct fdisk_dos_label *l = self_label(cxt); + struct pte *ext_pe = l->ext_offset ? self_pte(cxt, l->ext_index) : NULL; + + if (!ext_pe) + return -EINVAL; + + *first = l->ext_offset + cxt->first_lba; + *last = get_abs_partition_end(ext_pe); + + } else { + /* primary partitions */ + if (fdisk_use_cylinders(cxt) || !cxt->total_sectors) + *last = cxt->geom.heads * cxt->geom.sectors * cxt->geom.cylinders - 1; + else + *last = cxt->total_sectors - 1; + + if (*last > UINT_MAX) + *last = UINT_MAX; + *first = cxt->first_lba; + } + + return 0; +} + +/* first free sector on disk */ +static int find_first_free_sector(struct fdisk_context *cxt, + int logical, + fdisk_sector_t start, + fdisk_sector_t *result) +{ + fdisk_sector_t first, last; + int rc; + + rc = get_disk_ranges(cxt, logical, &first, &last); + if (rc) + return rc; + + return find_first_free_sector_in_range(cxt, logical, start, last, result); +} + +static int add_partition(struct fdisk_context *cxt, size_t n, + struct fdisk_partition *pa) +{ + int sys, read = 0, rc, isrel = 0, is_logical; + struct fdisk_dos_label *l = self_label(cxt); + struct dos_partition *p = self_partition(cxt, n); + struct fdisk_ask *ask = NULL; + + fdisk_sector_t start, stop, limit, temp; + + DBG(LABEL, ul_debug("DOS: adding partition %zu", n)); + + sys = pa && pa->type ? pa->type->code : MBR_LINUX_DATA_PARTITION; + is_logical = n >= 4; + + if (p && is_used_partition(p)) { + fdisk_warnx(cxt, _("Partition %zu is already defined. " + "Delete it before re-adding it."), + n + 1); + return -EINVAL; + } + + rc = get_disk_ranges(cxt, is_logical, &start, &stop); + if (rc) + return rc; + + if (!is_logical && cxt->parent && fdisk_is_label(cxt->parent, GPT)) + start = 1; /* Bad boy modifies hybrid MBR */ + + rc = find_last_free_sector_in_range(cxt, is_logical, start, stop, &limit); + if (rc == -ENOSPC) + fdisk_warnx(cxt, _("No free sectors available.")); + if (rc) + return rc; + + if ((is_logical || !cxt->parent || !fdisk_is_label(cxt->parent, GPT)) + && cxt->script && pa && fdisk_partition_has_start(pa) + && pa->start >= (is_logical ? l->ext_offset : 1) + && pa->start < start) { + fdisk_set_first_lba(cxt, 1); + + rc = get_disk_ranges(cxt, is_logical, &start, &stop); + if (rc) /* won't happen, but checking to be proper */ + return rc; + } + + /* + * Ask for first sector + */ + do { + fdisk_sector_t dflt, aligned; + + temp = start; + + DBG(LABEL, ul_debug("DOS: >>> search for first free from %ju", start)); + rc = find_first_free_sector(cxt, is_logical, start, &dflt); + if (rc == -ENOSPC) + fdisk_warnx(cxt, _("No free sectors available.")); + if (rc) + return rc; + start = dflt; + + if (n >= 4 && pa && fdisk_partition_has_start(pa) && cxt->script + && cxt->first_lba > 1 + && temp == start - cxt->first_lba) { + fdisk_set_first_lba(cxt, 1); + start = pa->start; + } + + /* the default sector should be aligned and unused */ + do { + aligned = fdisk_align_lba_in_range(cxt, dflt, dflt, limit); + find_first_free_sector(cxt, is_logical, aligned, &dflt); + } while (dflt != aligned && dflt > aligned && dflt < limit); + + if (dflt >= limit) + dflt = start; + if (start > limit) + break; + if (start >= temp + fdisk_get_units_per_sector(cxt) + && read) { + if (!pa || !pa->start_follow_default) + fdisk_info(cxt, _("Sector %ju is already allocated."), + (uintmax_t) temp); + temp = start; + read = 0; + if (pa && fdisk_partition_has_start(pa)) + break; + } + + if (!read && start == temp) { + rc = get_start_from_user(cxt, &start, temp, dflt, limit, pa); + if (rc) + return rc; + read = 1; + } + if (pa && fdisk_partition_has_size(pa)) { + fdisk_sector_t last; + + rc = find_last_free(cxt, is_logical, start, limit, &last); + if (rc == 0 && last - start + 1 < fdisk_partition_get_size(pa)) { + DBG(LABEL, ul_debug("DOS: area <%ju,%ju> too small [wanted=%ju aval=%ju]", + (uintmax_t) start, (uintmax_t) last, + fdisk_partition_get_size(pa), + last - start)); + + if (fdisk_partition_has_start(pa) + && fdisk_partition_get_start(pa) <= last) + rc = -ENOSPC; + else { + start = last + 1; + continue; + } + } + if (rc == -ENOSPC) { + fdisk_warnx(cxt, _("No free sectors available.")); + return rc; + } + } + + } while (start != temp || !read); + + if (n == 4) { + /* The first EBR is stored at begin of the extended partition */ + struct pte *pe = self_pte(cxt, n); + + assert(pe); + pe->offset = l->ext_offset; + } else if (n > 4) { + /* The second (and another) EBR */ + struct pte *pe = self_pte(cxt, n); + + assert(pe); + assert(start >= cxt->first_lba); + + pe->offset = start - cxt->first_lba; + DBG(LABEL, ul_debug("DOS: setting EBR offset to %ju [start=%ju]", pe->offset, start)); + + if (pe->offset == l->ext_offset) { /* must be corrected */ + pe->offset++; + if (cxt->first_lba == 1) + start++; + } + } + + rc = find_last_free(cxt, is_logical, start, limit, &stop); + if (rc == -ENOSPC) + fdisk_warnx(cxt, _("No free sectors available.")); + if (rc) + return rc; + limit = stop; + + /* + * Ask for last sector + */ + if (fdisk_cround(cxt, start) == fdisk_cround(cxt, limit)) + stop = limit; + else if (pa && pa->end_follow_default) + stop = limit; + else if (pa && fdisk_partition_has_size(pa)) { + stop = start + pa->size; + isrel = pa->size_explicit ? 0 : 1; + if ((!isrel || !alignment_required(cxt)) && stop > start) + stop -= 1; + } else { + /* ask user by dialog */ + for (;;) { + if (!ask) + ask = fdisk_new_ask(); + else + fdisk_reset_ask(ask); + if (!ask) + return -ENOMEM; + fdisk_ask_set_type(ask, FDISK_ASKTYPE_OFFSET); + + if (fdisk_use_cylinders(cxt)) { + fdisk_ask_set_query(ask, _("Last cylinder, +/-cylinders or +/-size{K,M,G,T,P}")); + fdisk_ask_number_set_unit(ask, + cxt->sector_size * + fdisk_get_units_per_sector(cxt)); + } else { + fdisk_ask_set_query(ask, _("Last sector, +/-sectors or +/-size{K,M,G,T,P}")); + fdisk_ask_number_set_unit(ask,cxt->sector_size); + } + + fdisk_ask_number_set_low(ask, fdisk_cround(cxt, start)); + fdisk_ask_number_set_default(ask, fdisk_cround(cxt, limit)); + fdisk_ask_number_set_high(ask, fdisk_cround(cxt, limit)); + fdisk_ask_number_set_base(ask, fdisk_cround(cxt, start)); /* base for relative input */ + fdisk_ask_number_set_wrap_negative(ask, 1); /* wrap negative around high */ + + rc = fdisk_do_ask(cxt, ask); + if (rc) + goto done; + + stop = fdisk_ask_number_get_result(ask); + isrel = fdisk_ask_number_is_relative(ask); + if (fdisk_use_cylinders(cxt)) { + stop = stop * fdisk_get_units_per_sector(cxt) - 1; + if (stop >limit) + stop = limit; + } + + if (stop >= start && stop <= limit) + break; + fdisk_warnx(cxt, _("Value out of range.")); + } + } + + DBG(LABEL, ul_debug("DOS: raw stop: %ju [limit %ju]", (uintmax_t) stop, (uintmax_t) limit)); + + if (stop > limit) + stop = limit; + + if (isrel && stop - start < (cxt->grain / fdisk_get_sector_size(cxt))) { + /* Don't try to be smart on very small partitions and don't align so small sizes */ + isrel = 0; + DBG(LABEL, ul_debug("DOS: don't align end of tiny partition [start=%ju, stop=%ju, grain=%lu]", + (uintmax_t)start, (uintmax_t)stop, cxt->grain)); + } + + if (stop < limit && isrel && alignment_required(cxt)) { + /* the last sector has not been exactly requested (but + * defined by +size{K,M,G} convention), so be smart and + * align the end of the partition. The next partition + * will start at phy.block boundary. + */ + stop = fdisk_align_lba_in_range(cxt, stop, start, limit); + if (stop > start) + stop -= 1; /* end one sector before aligned offset */ + if (stop > limit) + stop = limit; + DBG(LABEL, ul_debug("DOS: aligned stop: %ju", (uintmax_t) stop)); + } + + set_partition(cxt, n, 0, start, stop, sys, fdisk_partition_is_bootable(pa)); + if (n > 4) { + struct pte *pe = self_pte(cxt, n); + assert(pe); + set_partition(cxt, n - 1, 1, pe->offset, stop, + MBR_DOS_EXTENDED_PARTITION, 0); + } + + /* report */ + { + struct fdisk_parttype *t = + fdisk_label_get_parttype_from_code(cxt->label, sys); + fdisk_info_new_partition(cxt, n + 1, start, stop, t); + fdisk_unref_parttype(t); + } + + + if (IS_EXTENDED(sys)) { + struct pte *pen = self_pte(cxt, n); + + assert(pen); + l->ext_index = n; + l->ext_offset = start; + pen->ex_entry = p; + } + + fdisk_label_set_changed(cxt->label, 1); + rc = 0; +done: + fdisk_unref_ask(ask); + return rc; +} + +static int add_logical(struct fdisk_context *cxt, + struct fdisk_partition *pa, + size_t *partno) +{ + struct pte *pe; + int rc; + + assert(cxt); + assert(partno); + assert(cxt->label); + assert(self_label(cxt)->ext_offset); + + DBG(LABEL, ul_debug("DOS: nparts max: %zu", cxt->label->nparts_max)); + pe = self_pte(cxt, cxt->label->nparts_max); + assert(pe); + + if (!pe->sectorbuffer) { + pe->sectorbuffer = calloc(1, cxt->sector_size); + if (!pe->sectorbuffer) + return -ENOMEM; + DBG(LABEL, ul_debug("DOS: logical: %zu: new EBR sector buffer %p", + cxt->label->nparts_max, pe->sectorbuffer)); + pe->private_sectorbuffer = 1; + } + pe->pt_entry = mbr_get_partition(pe->sectorbuffer, 0); + pe->ex_entry = pe->pt_entry + 1; + pe->offset = 0; + partition_set_changed(cxt, cxt->label->nparts_max, 1); + + cxt->label->nparts_max++; + + /* this message makes sense only when we use extended/primary/logical + * dialog. The dialog is disable for scripts, see dos_add_partition() */ + if (!cxt->script) + fdisk_info(cxt, _("Adding logical partition %zu"), + cxt->label->nparts_max); + *partno = cxt->label->nparts_max - 1; + rc = add_partition(cxt, *partno, pa); + + if (rc) { + /* reset on error */ + cxt->label->nparts_max--; + pe->pt_entry = NULL; + pe->ex_entry = NULL; + pe->offset = 0; + pe->changed = 0; + } + + return rc; +} + +static int check(struct fdisk_context *cxt, size_t n, + unsigned int h, unsigned int s, unsigned int c, + unsigned int lba_sector) +{ + unsigned int chs_sector, real_s, real_c; + int nerrors = 0; + + if (!is_dos_compatible(cxt)) + return 0; + + real_s = sector(s) - 1; + real_c = cylinder(s, c); + chs_sector = (real_c * cxt->geom.heads + h) * cxt->geom.sectors + real_s; + + if (!chs_sector) { + fdisk_warnx(cxt, _("Partition %zu: contains sector 0"), n); + nerrors++; + } + if (h >= cxt->geom.heads) { + fdisk_warnx(cxt, _("Partition %zu: head %d greater than " + "maximum %d"), n, h + 1, cxt->geom.heads); + nerrors++; + } + if (real_s >= cxt->geom.sectors) { + fdisk_warnx(cxt, _("Partition %zu: sector %d greater than " + "maximum %ju"), n, real_s + 1, + (uintmax_t) cxt->geom.sectors); + nerrors++; + } + if (real_c >= cxt->geom.cylinders) { + fdisk_warnx(cxt, _("Partition %zu: cylinder %d greater than " + "maximum %ju"), + n, real_c + 1, + (uintmax_t) cxt->geom.cylinders); + nerrors++; + } + if (lba_sector / (cxt->geom.heads * cxt->geom.sectors) < 1024 && lba_sector != chs_sector) { + fdisk_warnx(cxt, _("Partition %zu: LBA sector %u " + "disagrees with C/H/S calculated sector %u"), + n, lba_sector, chs_sector); + nerrors++; + } + + return nerrors; +} + +/* check_consistency() and long2chs() added Sat Mar 6 12:28:16 1993, + * faith@cs.unc.edu, based on code fragments from pfdisk by Gordon W. Ross, + * Jan. 1990 (version 1.2.1 by Gordon W. Ross Aug. 1990; Modified by S. + * Lubkin Oct. 1991). */ + +static void +long2chs(struct fdisk_context *cxt, unsigned long ls, + unsigned int *c, unsigned int *h, unsigned int *s) { + int spc = cxt->geom.heads * cxt->geom.sectors; + + *c = ls / spc; + ls = ls % spc; + *h = ls / cxt->geom.sectors; + *s = ls % cxt->geom.sectors + 1; /* sectors count from 1 */ +} + +static int check_consistency(struct fdisk_context *cxt, struct dos_partition *p, + size_t partition) +{ + unsigned int pbc, pbh, pbs; /* physical beginning c, h, s */ + unsigned int pec, peh, pes; /* physical ending c, h, s */ + unsigned int lbc, lbh, lbs; /* logical beginning c, h, s */ + unsigned int lec, leh, les; /* logical ending c, h, s */ + int nerrors = 0; + + if (!is_dos_compatible(cxt)) + return 0; + + if (!cxt->geom.heads || !cxt->geom.sectors || (partition >= 4)) + return 0; /* do not check extended partitions */ + + /* physical beginning c, h, s */ + pbc = cylinder(p->bs, p->bc); + pbh = p->bh; + pbs = sector(p->bs); + + /* physical ending c, h, s */ + pec = cylinder(p->es, p->ec); + peh = p->eh; + pes = sector(p->es); + + /* compute logical beginning (c, h, s) */ + long2chs(cxt, dos_partition_get_start(p), &lbc, &lbh, &lbs); + + /* compute logical ending (c, h, s) */ + long2chs(cxt, dos_partition_get_start(p) + dos_partition_get_size(p) - 1, &lec, &leh, &les); + + /* Same physical / logical beginning? */ + if (lbc < 1024 + && (pbc != lbc || pbh != lbh || pbs != lbs)) { + fdisk_warnx(cxt, _("Partition %zu: different physical/logical " + "beginnings (non-Linux?): " + "phys=(%d, %d, %d), logical=(%d, %d, %d)"), + partition + 1, + pbc, pbh, pbs, + lbc, lbh, lbs); + nerrors++; + } + + /* Same physical / logical ending? */ + if (lec < 1024 + && (pec != lec || peh != leh || pes != les)) { + fdisk_warnx(cxt, _("Partition %zu: different physical/logical " + "endings: phys=(%d, %d, %d), logical=(%d, %d, %d)"), + partition + 1, + pec, peh, pes, + lec, leh, les); + nerrors++; + } + + /* Ending on cylinder boundary? */ + if (peh != (cxt->geom.heads - 1) || pes != cxt->geom.sectors) { + fdisk_warnx(cxt, _("Partition %zu: does not end on " + "cylinder boundary."), + partition + 1); + nerrors++; + } + + return nerrors; +} + +static void fill_bounds(struct fdisk_context *cxt, + fdisk_sector_t *first, fdisk_sector_t *last) +{ + size_t i; + struct pte *pe = self_pte(cxt, 0); + struct dos_partition *p; + + assert(pe); + for (i = 0; i < cxt->label->nparts_max; pe++,i++) { + p = pe->pt_entry; + if (is_cleared_partition(p) || IS_EXTENDED (p->sys_ind)) { + first[i] = SIZE_MAX; + last[i] = 0; + } else { + first[i] = get_abs_partition_start(pe); + last[i] = get_abs_partition_end(pe); + } + } +} + +static int dos_verify_disklabel(struct fdisk_context *cxt) +{ + size_t i, j; + fdisk_sector_t total = 1, n_sectors = cxt->total_sectors; + fdisk_sector_t first[cxt->label->nparts_max], + last[cxt->label->nparts_max]; + struct dos_partition *p; + struct fdisk_dos_label *l = self_label(cxt); + int nerrors = 0; + + assert(fdisk_is_label(cxt, DOS)); + + fill_bounds(cxt, first, last); + for (i = 0; i < cxt->label->nparts_max; i++) { + struct pte *pe = self_pte(cxt, i); + + p = self_partition(cxt, i); + if (p && is_used_partition(p) && !IS_EXTENDED(p->sys_ind)) { + nerrors += check_consistency(cxt, p, i); + assert(pe); + if (get_abs_partition_start(pe) < first[i]) { + fdisk_warnx(cxt, _( + "Partition %zu: bad start-of-data."), + i + 1); + nerrors++; + } + + nerrors += check(cxt, i + 1, p->bh, p->bs, p->bc, first[i]); + nerrors += check(cxt, i + 1, p->eh, p->es, p->ec, last[i]); + total += last[i] + 1 - first[i]; + + if (i == 0) + total += get_abs_partition_start(pe) - 1; + + for (j = 0; j < i; j++) { + if ((first[i] >= first[j] && first[i] <= last[j]) + || ((last[i] <= last[j] && last[i] >= first[j]))) { + + fdisk_warnx(cxt, _("Partition %zu: " + "overlaps partition %zu."), + j + 1, i + 1); + nerrors++; + + total += first[i] >= first[j] ? + first[i] : first[j]; + total -= last[i] <= last[j] ? + last[i] : last[j]; + } + } + } + } + + if (l->ext_offset) { + fdisk_sector_t e_last; + struct pte *ext_pe = self_pte(cxt, l->ext_index); + + assert(ext_pe); + e_last = get_abs_partition_end(ext_pe); + + for (i = 4; i < cxt->label->nparts_max; i++) { + total++; + p = self_partition(cxt, i); + assert(p); + + if (!p->sys_ind) { + if (i != 4 || i + 1 < cxt->label->nparts_max) { + fdisk_warnx(cxt, + _("Partition %zu: empty."), + i + 1); + nerrors++; + } + } else if (first[i] < l->ext_offset + || last[i] > e_last) { + + fdisk_warnx(cxt, _("Logical partition %zu: " + "not entirely in partition %zu."), + i + 1, l->ext_index + 1); + nerrors++; + } + } + } + + if (!nerrors) { + fdisk_info(cxt, _("No errors detected.")); + if (total > n_sectors) + fdisk_info(cxt, _("Total allocated sectors %ju greater " + "than the maximum %ju."), (uintmax_t) total, (uintmax_t) n_sectors); + else if (total < n_sectors) + fdisk_info(cxt, _("Remaining %ju unallocated %ld-byte " + "sectors."), (uintmax_t) n_sectors - total, cxt->sector_size); + } else + fdisk_warnx(cxt, + P_("%d error detected.", "%d errors detected.", nerrors), + nerrors); + + return nerrors; +} + +/* + * Ask the user for new partition type information (logical, extended). + * This function calls the actual partition adding logic - add_partition. + * + * API callback. + */ +static int dos_add_partition(struct fdisk_context *cxt, + struct fdisk_partition *pa, + size_t *partno) +{ + size_t i; + uint8_t free_primary = 0, free_sectors = 0; + fdisk_sector_t first = 0, grain; + int rc = 0; + struct fdisk_dos_label *l; + struct pte *ext_pe; + size_t res = 0; /* partno */ + + assert(cxt); + assert(cxt->label); + assert(fdisk_is_label(cxt, DOS)); + + DBG(LABEL, ul_debug("DOS: new partition wanted")); + + l = self_label(cxt); + + if (cxt->label->nparts_max >= MAXIMUM_PARTS) { + fdisk_warnx(cxt, _("The maximum number of partitions has " + "been created.")); + return -EINVAL; + } + + ext_pe = l->ext_offset ? self_pte(cxt, l->ext_index) : NULL; + + /* + * partition template (@pa) based partitioning + */ + + /* A) template specifies start within extended partition; add logical */ + if (pa && fdisk_partition_has_start(pa) && ext_pe + && pa->start >= l->ext_offset + && pa->start <= get_abs_partition_end(ext_pe)) { + DBG(LABEL, ul_debug("DOS: pa template %p: add logical (by offset)", pa)); + + if (fdisk_partition_has_partno(pa) && fdisk_partition_get_partno(pa) < 4) { + DBG(LABEL, ul_debug("DOS: pa template specifies partno<4 for logical partition")); + return -EINVAL; + } + rc = add_logical(cxt, pa, &res); + goto done; + + /* B) template specifies start out of extended partition; add primary */ + } else if (pa && fdisk_partition_has_start(pa) && ext_pe) { + DBG(LABEL, ul_debug("DOS: pa template %p: add primary (by offset)", pa)); + + if (fdisk_partition_has_partno(pa) && fdisk_partition_get_partno(pa) >= 4) { + DBG(LABEL, ul_debug("DOS: pa template specifies partno>=4 for primary partition")); + return -EINVAL; + } + if (ext_pe && pa->type && IS_EXTENDED(pa->type->code)) { + fdisk_warnx(cxt, _("Extended partition already exists.")); + return -EINVAL; + } + rc = get_partition_unused_primary(cxt, pa, &res); + if (rc == 0) + rc = add_partition(cxt, res, pa); + goto done; + + /* C) template specifies start (or default), partno < 4; add primary */ + } else if (pa && (fdisk_partition_start_is_default(pa) || fdisk_partition_has_start(pa)) + && fdisk_partition_has_partno(pa) + && pa->partno < 4) { + DBG(LABEL, ul_debug("DOS: pa template %p: add primary (by partno)", pa)); + + if (ext_pe && pa->type && IS_EXTENDED(pa->type->code)) { + fdisk_warnx(cxt, _("Extended partition already exists.")); + return -EINVAL; + } + rc = get_partition_unused_primary(cxt, pa, &res); + if (rc == 0) + rc = add_partition(cxt, res, pa); + goto done; + + /* D) template specifies start (or default), partno >= 4; add logical */ + } else if (pa && (fdisk_partition_start_is_default(pa) || fdisk_partition_has_start(pa)) + && fdisk_partition_has_partno(pa) + && pa->partno >= 4) { + DBG(LABEL, ul_debug("DOS: pa template %p: add logical (by partno)", pa)); + + if (!ext_pe) { + fdisk_warnx(cxt, _("Extended partition does not exists. Failed to add logical partition.")); + return -EINVAL; + } + + if (fdisk_partition_has_start(pa) + && pa->start < l->ext_offset + && pa->start > get_abs_partition_end(ext_pe)) { + DBG(LABEL, ul_debug("DOS: pa template specifies partno>=4, but start out of extended")); + return -EINVAL; + } + + rc = add_logical(cxt, pa, &res); + goto done; + } + + DBG(LABEL, ul_debug("DOS: dialog driven partitioning")); + /* Note @pa may be still used for things like partition type, etc */ + + /* check if there is space for primary partition */ + grain = cxt->grain > cxt->sector_size ? cxt->grain / cxt->sector_size : 1; + first = cxt->first_lba; + + if (cxt->parent && fdisk_is_label(cxt->parent, GPT)) { + /* modifying a hybrid MBR, which throws out the rules */ + grain = 1; + first = 1; + } + + /* set @first after the last used partition, set @free_sectors if there + * is gap in front if the first partition or between used parrtitions. */ + for (i = 0; i < 4; i++) { + struct dos_partition *p = self_partition(cxt, i); + + if (p && is_used_partition(p)) { + fdisk_sector_t start = dos_partition_get_start(p); + if (first + grain <= start) + free_sectors = 1; + first = start + dos_partition_get_size(p); + } else + free_primary++; + } + + /* set @free_sectors if there is a space after the first usable sector */ + if (first + grain - 1 <= cxt->total_sectors - 1) + free_sectors = 1; + + DBG(LABEL, ul_debug("DOS: primary: first free: %ju, last on disk: %ju, " + "free_sectors=%d, free_primary=%d", + (uintmax_t) first, + (uintmax_t) cxt->total_sectors - 1, + free_sectors, free_primary)); + + if (!free_primary || !free_sectors) { + DBG(LABEL, ul_debug("DOS: primary impossible")); + if (l->ext_offset) { + if (!pa || fdisk_partition_has_start(pa)) { + /* See above case A); here we have start, but + * out of extended partition */ + const char *msg; + if (!free_primary) + msg = _("All primary partitions are in use."); + else + msg = _("All space for primary partitions is in use."); + + if (pa && fdisk_partition_has_start(pa)) { + fdisk_warnx(cxt, "%s", msg); + return -EINVAL; + } + fdisk_info(cxt, "%s", msg); + } + DBG(LABEL, ul_debug("DOS: trying logical")); + rc = add_logical(cxt, pa, &res); + } else { + if (free_primary) + fdisk_info(cxt, _("All space for primary partitions is in use.")); + else + /* TRANSLATORS: Try to keep this within 80 characters. */ + fdisk_info(cxt, _("To create more partitions, first replace " + "a primary with an extended partition.")); + return -EINVAL; + } + } else { + char hint[BUFSIZ]; + struct fdisk_ask *ask; + int c = 0; + + /* the default layout for scripts is to create primary partitions */ + if (cxt->script || !fdisk_has_dialogs(cxt)) { + rc = get_partition_unused_primary(cxt, pa, &res); + if (rc == 0) + rc = add_partition(cxt, res, pa); + goto done; + } + + ask = fdisk_new_ask(); + if (!ask) + return -ENOMEM; + fdisk_ask_set_type(ask, FDISK_ASKTYPE_MENU); + fdisk_ask_set_query(ask, _("Partition type")); + fdisk_ask_menu_set_default(ask, free_primary == 1 + && !l->ext_offset ? 'e' : 'p'); + snprintf(hint, sizeof(hint), + _("%u primary, %d extended, %u free"), + 4 - (l->ext_offset ? 1 : 0) - free_primary, + l->ext_offset ? 1 : 0, + free_primary); + + fdisk_ask_menu_add_item(ask, 'p', _("primary"), hint); + if (!l->ext_offset) + fdisk_ask_menu_add_item(ask, 'e', _("extended"), _("container for logical partitions")); + else + fdisk_ask_menu_add_item(ask, 'l', _("logical"), _("numbered from 5")); + + rc = fdisk_do_ask(cxt, ask); + if (!rc) + fdisk_ask_menu_get_result(ask, &c); + fdisk_unref_ask(ask); + if (rc) + return rc; + + if (c == 'p') { + rc = get_partition_unused_primary(cxt, pa, &res); + if (rc == 0) + rc = add_partition(cxt, res, pa); + goto done; + } else if (c == 'l' && l->ext_offset) { + rc = add_logical(cxt, pa, &res); + goto done; + } else if (c == 'e' && !l->ext_offset) { + rc = get_partition_unused_primary(cxt, pa, &res); + if (rc == 0) { + struct fdisk_partition *xpa = NULL; + struct fdisk_parttype *t; + + t = fdisk_label_get_parttype_from_code(cxt->label, + MBR_DOS_EXTENDED_PARTITION); + if (!pa) { + pa = xpa = fdisk_new_partition(); + if (!xpa) + return -ENOMEM; + } + fdisk_partition_set_type(pa, t); + rc = add_partition(cxt, res, pa); + if (xpa) { + fdisk_unref_partition(xpa); + pa = NULL; + } + } + goto done; + } else + fdisk_warnx(cxt, _("Invalid partition type `%c'."), c); + } +done: + if (rc == 0) { + cxt->label->nparts_cur++; + if (partno) + *partno = res; + } + return rc; +} + +static int write_sector(struct fdisk_context *cxt, fdisk_sector_t secno, + unsigned char *buf) +{ + int rc; + + rc = seek_sector(cxt, secno); + if (rc != 0) { + fdisk_warn(cxt, _("Cannot write sector %jd: seek failed"), + (uintmax_t) secno); + return rc; + } + + DBG(LABEL, ul_debug("DOS: writing to sector %ju", (uintmax_t) secno)); + + if (write(cxt->dev_fd, buf, cxt->sector_size) != (ssize_t) cxt->sector_size) + return -errno; + return 0; +} + +static int dos_write_disklabel(struct fdisk_context *cxt) +{ + struct fdisk_dos_label *l = self_label(cxt); + size_t i; + int rc = 0, mbr_changed = 0; + + assert(cxt); + assert(cxt->label); + assert(fdisk_is_label(cxt, DOS)); + + DBG(LABEL, ul_debug("DOS: write PT requested [label-changed: %d, non-pt-changed: %d]", + cxt->label->changed, l->non_pt_changed)); + + mbr_changed = l->non_pt_changed; + + /* MBR (primary partitions) */ + if (!mbr_changed) { + for (i = 0; i < 4; i++) { + struct pte *pe = self_pte(cxt, i); + + assert(pe); + if (pe->changed) + mbr_changed = 1; + } + } + if (mbr_changed) { + DBG(LABEL, ul_debug("DOS: MBR changed, writing")); + mbr_set_magic(cxt->firstsector); + rc = write_sector(cxt, 0, cxt->firstsector); + if (rc) + goto done; + } + + if (cxt->label->nparts_max <= 4 && l->ext_offset) { + /* we have empty extended partition, check if the partition has + * been modified and then cleanup possible remaining EBR */ + struct pte *pe = self_pte(cxt, l->ext_index); + unsigned char empty[512] = { 0 }; + fdisk_sector_t off = pe ? get_abs_partition_start(pe) : 0; + + if (off && pe->changed) { + mbr_set_magic(empty); + write_sector(cxt, off, empty); + } + } + + /* EBR (logical partitions) */ + for (i = 4; i < cxt->label->nparts_max; i++) { + struct pte *pe = self_pte(cxt, i); + + assert(pe); + if (!pe->changed || !pe->offset || !pe->sectorbuffer) + continue; + + mbr_set_magic(pe->sectorbuffer); + rc = write_sector(cxt, pe->offset, pe->sectorbuffer); + if (rc) + goto done; + } + +done: + return rc; +} + +static int dos_locate_disklabel(struct fdisk_context *cxt, int n, + const char **name, uint64_t *offset, size_t *size) +{ + assert(cxt); + + *name = NULL; + *offset = 0; + *size = 0; + + switch (n) { + case 0: + *name = "MBR"; + *offset = 0; + *size = 512; + break; + default: + /* extended partitions */ + if ((size_t)n - 1 + 4 < cxt->label->nparts_max) { + struct pte *pe = self_pte(cxt, n - 1 + 4); + + assert(pe); + assert(pe->private_sectorbuffer); + + *name = "EBR"; + *offset = (uint64_t) pe->offset * cxt->sector_size; + *size = 512; + } else + return 1; + break; + } + + return 0; +} + +/* + * Check whether partition entries are ordered by their starting positions. + * Return 0 if OK. Return i if partition i should have been earlier. + * Two separate checks: primary and logical partitions. + */ +static int wrong_p_order(struct fdisk_context *cxt, size_t *prev) +{ + size_t last_p_start_pos = 0, p_start_pos; + size_t i, last_i = 0; + + for (i = 0 ; i < cxt->label->nparts_max; i++) { + + struct pte *pe = self_pte(cxt, i); + struct dos_partition *p; + + assert(pe); + p = pe->pt_entry; + + if (i == 4) { + last_i = 4; + last_p_start_pos = 0; + } + if (is_used_partition(p)) { + p_start_pos = get_abs_partition_start(pe); + + if (last_p_start_pos > p_start_pos) { + if (prev) + *prev = last_i; + return i; + } + + last_p_start_pos = p_start_pos; + last_i = i; + } + } + return 0; +} + +static int dos_get_disklabel_item(struct fdisk_context *cxt, struct fdisk_labelitem *item) +{ + int rc = 0; + + assert(cxt); + assert(cxt->label); + assert(fdisk_is_label(cxt, DOS)); + + switch (item->id) { + case FDISK_LABELITEM_ID: + { + unsigned int num = mbr_get_id(cxt->firstsector); + item->name = _("Disk identifier"); + item->type = 's'; + if (asprintf(&item->data.str, "0x%08x", num) < 0) + rc = -ENOMEM; + break; + } + default: + if (item->id < __FDISK_NLABELITEMS) + rc = 1; /* unsupported generic item */ + else + rc = 2; /* out of range */ + break; + } + + return rc; + +} + +static int dos_get_partition(struct fdisk_context *cxt, size_t n, + struct fdisk_partition *pa) +{ + struct dos_partition *p; + struct pte *pe; + struct fdisk_dos_label *lb; + + assert(cxt); + assert(pa); + assert(cxt->label); + assert(fdisk_is_label(cxt, DOS)); + + lb = self_label(cxt); + + pe = self_pte(cxt, n); + assert(pe); + + p = pe->pt_entry; + pa->used = !is_cleared_partition(p); + if (!pa->used) + return 0; + + pa->type = dos_partition_parttype(cxt, p); + pa->boot = p->boot_ind == ACTIVE_FLAG ? 1 : 0; + pa->start = get_abs_partition_start(pe); + pa->size = dos_partition_get_size(p); + pa->container = lb->ext_offset && n == lb->ext_index; + + if (n >= 4) + pa->parent_partno = lb->ext_index; + + if (p->boot_ind && asprintf(&pa->attrs, "%02x", p->boot_ind) < 0) + return -ENOMEM; + + /* start C/H/S */ + if (asprintf(&pa->start_chs, "%d/%d/%d", + cylinder(p->bs, p->bc), + p->bh, + sector(p->bs)) < 0) + return -ENOMEM; + + /* end C/H/S */ + if (asprintf(&pa->end_chs, "%d/%d/%d", + cylinder(p->es, p->ec), + p->eh, + sector(p->es)) < 0) + return -ENOMEM; + + return 0; +} + +static int has_logical(struct fdisk_context *cxt) +{ + size_t i; + struct fdisk_dos_label *l = self_label(cxt); + + for (i = 4; i < cxt->label->nparts_max; i++) { + if (l->ptes[i].pt_entry) + return 1; + } + return 0; +} + +static int dos_set_partition(struct fdisk_context *cxt, size_t n, + struct fdisk_partition *pa) +{ + struct fdisk_dos_label *l; + struct dos_partition *p; + struct pte *pe; + int orgtype; + fdisk_sector_t start, size; + + assert(cxt); + assert(pa); + assert(cxt->label); + assert(fdisk_is_label(cxt, DOS)); + + if (n >= cxt->label->nparts_max) + return -EINVAL; + + l = self_label(cxt); + p = self_partition(cxt, n); + assert(p); + + pe = self_pte(cxt, n); + if (!pe) + return -EINVAL; + + orgtype = p->sys_ind; + + if (pa->type) { + if (IS_EXTENDED(pa->type->code) && l->ext_offset && l->ext_index != n) { + fdisk_warnx(cxt, _("Extended partition already exists.")); + return -EINVAL; + } + + if (!pa->type->code) + fdisk_warnx(cxt, _("Type 0 means free space to many systems. " + "Having partitions of type 0 is probably unwise.")); + + if (IS_EXTENDED(p->sys_ind) && !IS_EXTENDED(pa->type->code) && has_logical(cxt)) { + fdisk_warnx(cxt, _( + "Cannot change type of the extended partition which is " + "already used by logical partitions. Delete logical " + "partitions first.")); + return -EINVAL; + } + } + + FDISK_INIT_UNDEF(start); + FDISK_INIT_UNDEF(size); + + if (fdisk_partition_has_start(pa)) + start = pa->start; + if (fdisk_partition_has_size(pa)) + size = pa->size; + + if (!FDISK_IS_UNDEF(start) || !FDISK_IS_UNDEF(size)) { + DBG(LABEL, ul_debug("DOS: resize partition")); + + if (FDISK_IS_UNDEF(start)) + start = get_abs_partition_start(pe); + if (FDISK_IS_UNDEF(size)) + size = dos_partition_get_size(p); + + set_partition(cxt, n, 0, start, start + size - 1, + pa->type ? pa->type->code : p->sys_ind, + FDISK_IS_UNDEF(pa->boot) ? + p->boot_ind == ACTIVE_FLAG : + fdisk_partition_is_bootable(pa)); + } else { + DBG(LABEL, ul_debug("DOS: keep size, modify properties")); + if (pa->type) + p->sys_ind = pa->type->code; + if (!FDISK_IS_UNDEF(pa->boot)) + p->boot_ind = fdisk_partition_is_bootable(pa) ? ACTIVE_FLAG : 0; + } + + if (pa->type) { + if (IS_EXTENDED(pa->type->code) && !IS_EXTENDED(orgtype)) { + /* new extended partition - create a reference */ + l->ext_index = n; + l->ext_offset = dos_partition_get_start(p); + pe->ex_entry = p; + } else if (IS_EXTENDED(orgtype)) { + /* remove extended partition */ + cxt->label->nparts_max = 4; + l->ptes[l->ext_index].ex_entry = NULL; + l->ext_offset = 0; + l->ext_index = 0; + } + } + + partition_set_changed(cxt, n, 1); + return 0; +} + +static void print_chain_of_logicals(struct fdisk_context *cxt) +{ + size_t i; + struct fdisk_dos_label *l = self_label(cxt); + + fputc('\n', stdout); + + for (i = 4; i < cxt->label->nparts_max; i++) { + struct pte *pe = self_pte(cxt, i); + + assert(pe); + fprintf(stderr, "#%02zu EBR [%10ju], " + "data[start=%10ju (%10ju), size=%10ju], " + "link[start=%10ju (%10ju), size=%10ju]\n", + i, (uintmax_t) pe->offset, + /* data */ + (uintmax_t) dos_partition_get_start(pe->pt_entry), + (uintmax_t) get_abs_partition_start(pe), + (uintmax_t) dos_partition_get_size(pe->pt_entry), + /* link */ + (uintmax_t) dos_partition_get_start(pe->ex_entry), + (uintmax_t) l->ext_offset + dos_partition_get_start(pe->ex_entry), + (uintmax_t) dos_partition_get_size(pe->ex_entry)); + } +} + +static int cmp_ebr_offsets(const void *a, const void *b) +{ + const struct pte *ae = (const struct pte *) a, + *be = (const struct pte *) b; + + if (ae->offset == 0 && be->offset == 0) + return 0; + if (ae->offset == 0) + return 1; + if (be->offset == 0) + return -1; + + return cmp_numbers(ae->offset, be->offset); +} + +/* + * Fix the chain of logicals. + * + * The function does not modify data partitions within EBR tables + * (pte->pt_entry). It sorts the chain by EBR offsets and then update links + * (pte->ex_entry) between EBR tables. + * + */ +static void fix_chain_of_logicals(struct fdisk_context *cxt) +{ + struct fdisk_dos_label *l = self_label(cxt); + struct pte *last; + size_t i; + + DBG(LABEL, print_chain_of_logicals(cxt)); + + /* Sort chain by EBR offsets */ + qsort(&l->ptes[4], cxt->label->nparts_max - 4, sizeof(struct pte), + cmp_ebr_offsets); + +again: + /* Sort data partitions by start */ + for (i = 4; i < cxt->label->nparts_max - 1; i++) { + struct pte *cur = self_pte(cxt, i), + *nxt = self_pte(cxt, i + 1); + + assert(cur); + assert(nxt); + + if (get_abs_partition_start(cur) > + get_abs_partition_start(nxt)) { + + struct dos_partition tmp = *cur->pt_entry; + fdisk_sector_t cur_start = get_abs_partition_start(cur), + nxt_start = get_abs_partition_start(nxt); + + /* swap data partitions */ + *cur->pt_entry = *nxt->pt_entry; + *nxt->pt_entry = tmp; + + /* Recount starts according to EBR offsets, the absolute + * address still has to be the same! */ + dos_partition_set_start(cur->pt_entry, nxt_start - cur->offset); + dos_partition_sync_chs(cur->pt_entry, cur->offset, cxt->geom.sectors, cxt->geom.heads); + dos_partition_set_start(nxt->pt_entry, cur_start - nxt->offset); + dos_partition_sync_chs(nxt->pt_entry, nxt->offset, cxt->geom.sectors, cxt->geom.heads); + + partition_set_changed(cxt, i, 1); + partition_set_changed(cxt, i + 1, 1); + goto again; + } + } + + /* Update EBR links */ + for (i = 4; i < cxt->label->nparts_max - 1; i++) { + struct pte *cur = self_pte(cxt, i), + *nxt = self_pte(cxt, i + 1); + + assert(cur); + assert(nxt); + + fdisk_sector_t noff = nxt->offset - l->ext_offset, + ooff = dos_partition_get_start(cur->ex_entry); + + if (noff == ooff) + continue; + + DBG(LABEL, ul_debug("DOS: fix EBR [%10ju] link %ju -> %ju", + (uintmax_t) cur->offset, + (uintmax_t) ooff, (uintmax_t) noff)); + + set_partition(cxt, i, 1, nxt->offset, + get_abs_partition_end(nxt), + MBR_DOS_EXTENDED_PARTITION, 0); + } + + /* always terminate the chain ! */ + last = self_pte(cxt, cxt->label->nparts_max - 1); + if (last) { + clear_partition(last->ex_entry); + partition_set_changed(cxt, cxt->label->nparts_max - 1, 1); + } + + DBG(LABEL, print_chain_of_logicals(cxt)); +} + +static int dos_reorder(struct fdisk_context *cxt) +{ + struct pte *pei, *pek; + size_t i,k; + + if (!wrong_p_order(cxt, NULL)) + return 1; + + while ((i = wrong_p_order(cxt, &k)) != 0 && i < 4) { + /* partition i should have come earlier, move it */ + /* We have to move data in the MBR */ + struct dos_partition *pi, *pk, *pe, pbuf; + pei = self_pte(cxt, i); + pek = self_pte(cxt, k); + + assert(pei); + assert(pek); + + pe = pei->ex_entry; + pei->ex_entry = pek->ex_entry; + pek->ex_entry = pe; + + pi = pei->pt_entry; + pk = pek->pt_entry; + + memmove(&pbuf, pi, sizeof(struct dos_partition)); + memmove(pi, pk, sizeof(struct dos_partition)); + memmove(pk, &pbuf, sizeof(struct dos_partition)); + + partition_set_changed(cxt, i, 1); + partition_set_changed(cxt, k, 1); + } + + if (i) + fix_chain_of_logicals(cxt); + + return 0; +} + +/** + * fdisk_dos_fix_chs: + * @cxt: fdisk context + * + * Fix beginning and ending C/H/S values for every partition + * according to LBA relative offset, relative beginning and + * size and fdisk idea of disk geometry (sectors per track + * and number of heads). + * + * Returns: number of fixed (changed) partitions. + */ +int fdisk_dos_fix_chs(struct fdisk_context *cxt) +{ + unsigned int obc, obh, obs; /* old beginning c, h, s */ + unsigned int oec, oeh, oes; /* old ending c, h, s */ + unsigned int nbc, nbh, nbs; /* new beginning c, h, s */ + unsigned int nec, neh, nes; /* new ending c, h, s */ + fdisk_sector_t l, sects; /* lba beginning and size */ + struct dos_partition *p; + struct pte *pe; + int changed = 0; + size_t i; + + assert(fdisk_is_label(cxt, DOS)); + + for (i = 0; i < cxt->label->nparts_max; i++) { + p = self_partition(cxt, i); + if (!p || !is_used_partition(p)) + continue; + + pe = self_pte(cxt, i); + + /* old beginning c, h, s */ + obc = cylinder(p->bs, p->bc); + obh = p->bh; + obs = sector(p->bs); + + /* old ending c, h, s */ + oec = cylinder(p->es, p->ec); + oeh = p->eh; + oes = sector(p->es); + + /* new beginning c, h, s */ + l = get_abs_partition_start(pe); + long2chs(cxt, l, &nbc, &nbh, &nbs); + if (l > UINT32_MAX || nbc >= 1024) { + nbc = 1023; + nbh = cxt->geom.heads-1; + nbs = cxt->geom.sectors; + } + + /* new ending c, h, s */ + sects = dos_partition_get_size(p); + long2chs(cxt, l + sects - 1, &nec, &neh, &nes); + if (lba_overflowed(l, sects) || nec >= 1024) { + nec = 1023; + neh = cxt->geom.heads-1; + nes = cxt->geom.sectors; + } + + if (obc != nbc || obh != nbh || obs != nbs || + oec != nec || oeh != neh || oes != nes) { + DBG(LABEL, ul_debug("DOS: changing %zu partition CHS " + "from (%d, %d, %d)-(%d, %d, %d) " + "to (%d, %d, %d)-(%d, %d, %d)", + i, obc, obh, obs, oec, oeh, oes, + nbc, nbh, nbs, nec, neh, nes)); + p->bc = nbc & 0xff; + p->bh = nbh; + p->bs = nbs | ((nbc >> 2) & 0xc0); + p->ec = nec & 0xff; + p->eh = neh; + p->es = nes | ((nec >> 2) & 0xc0); + partition_set_changed(cxt, i, 1); + changed++; + } + } + + return changed; +} + +/* TODO: use fdisk_set_partition() API */ +int fdisk_dos_move_begin(struct fdisk_context *cxt, size_t i) +{ + struct pte *pe; + struct dos_partition *p; + unsigned int new, free_start, curr_start, last; + uintmax_t res = 0; + size_t x; + int rc; + + assert(cxt); + assert(fdisk_is_label(cxt, DOS)); + + pe = self_pte(cxt, i); + if (!pe) + return -EINVAL; + + p = pe->pt_entry; + + if (!is_used_partition(p) || IS_EXTENDED (p->sys_ind)) { + fdisk_warnx(cxt, _("Partition %zu: no data area."), i + 1); + return 0; + } + + /* The safe start is at the second sector, but some use-cases require + * to have MBR within the first partition , so default to the first + * sector of the disk or at the second sector of the extended partition + */ + free_start = pe->offset ? pe->offset + 1 : 0; + + curr_start = get_abs_partition_start(pe); + + /* look for a free space before the current start of the partition */ + for (x = 0; x < cxt->label->nparts_max; x++) { + unsigned int end; + struct pte *prev_pe = self_pte(cxt, x); + struct dos_partition *prev_p; + + assert(prev_pe); + + prev_p = prev_pe->pt_entry; + if (!prev_p) + continue; + end = get_abs_partition_start(prev_pe) + + dos_partition_get_size(prev_p); + + if (is_used_partition(prev_p) && + end > free_start && end <= curr_start) + free_start = end; + } + + last = get_abs_partition_end(pe); + + rc = fdisk_ask_number(cxt, free_start, curr_start, last, + _("New beginning of data"), &res); + if (rc) + return rc; + + new = res - pe->offset; + + if (new != dos_partition_get_size(p)) { + unsigned int sects = dos_partition_get_size(p) + + dos_partition_get_start(p) - new; + + dos_partition_set_size(p, sects); + dos_partition_set_start(p, new); + dos_partition_sync_chs(p, pe->offset, cxt->geom.sectors, cxt->geom.heads); + + partition_set_changed(cxt, i, 1); + + if (new == 0) + fdisk_info(cxt, _("The new beginning of the partition overlaps the disk " + "label area. Be very careful when using the partition. " + "You can lose all your partitions on the disk.")); + } + + return rc; +} + +static int dos_partition_is_used( + struct fdisk_context *cxt, + size_t i) +{ + struct dos_partition *p; + + assert(cxt); + assert(cxt->label); + assert(fdisk_is_label(cxt, DOS)); + + if (i >= cxt->label->nparts_max) + return 0; + + p = self_partition(cxt, i); + + return p && !is_cleared_partition(p); +} + +static int dos_toggle_partition_flag( + struct fdisk_context *cxt, + size_t i, + unsigned long flag) +{ + struct dos_partition *p; + + assert(cxt); + assert(cxt->label); + assert(fdisk_is_label(cxt, DOS)); + + if (i >= cxt->label->nparts_max) + return -EINVAL; + + p = self_partition(cxt, i); + assert(p); + + switch (flag) { + case DOS_FLAG_ACTIVE: + if (IS_EXTENDED(p->sys_ind) && !p->boot_ind) + fdisk_warnx(cxt, _("Partition %zu: is an extended " + "partition."), i + 1); + + p->boot_ind = (p->boot_ind ? 0 : ACTIVE_FLAG); + partition_set_changed(cxt, i, 1); + fdisk_info(cxt, p->boot_ind ? + _("The bootable flag on partition %zu is enabled now.") : + _("The bootable flag on partition %zu is disabled now."), + i + 1); + break; + default: + return 1; + } + + return 0; +} + +static const struct fdisk_field dos_fields[] = +{ + /* basic */ + { FDISK_FIELD_DEVICE, N_("Device"), 10, 0 }, + { FDISK_FIELD_BOOT, N_("Boot"), 1, 0 }, + { FDISK_FIELD_START, N_("Start"), 5, FDISK_FIELDFL_NUMBER }, + { FDISK_FIELD_END, N_("End"), 5, FDISK_FIELDFL_NUMBER }, + { FDISK_FIELD_SECTORS, N_("Sectors"), 5, FDISK_FIELDFL_NUMBER }, + { FDISK_FIELD_CYLINDERS,N_("Cylinders"), 5, FDISK_FIELDFL_NUMBER }, + { FDISK_FIELD_SIZE, N_("Size"), 5, FDISK_FIELDFL_NUMBER | FDISK_FIELDFL_EYECANDY }, + { FDISK_FIELD_TYPEID, N_("Id"), 2, FDISK_FIELDFL_NUMBER }, + { FDISK_FIELD_TYPE, N_("Type"), 0.1, 0 }, + + /* expert mode */ + { FDISK_FIELD_SADDR, N_("Start-C/H/S"), 1, FDISK_FIELDFL_NUMBER | FDISK_FIELDFL_DETAIL }, + { FDISK_FIELD_EADDR, N_("End-C/H/S"), 1, FDISK_FIELDFL_NUMBER | FDISK_FIELDFL_DETAIL }, + { FDISK_FIELD_ATTR, N_("Attrs"), 2, FDISK_FIELDFL_NUMBER | FDISK_FIELDFL_DETAIL } + +}; + +static const struct fdisk_label_operations dos_operations = +{ + .probe = dos_probe_label, + .write = dos_write_disklabel, + .verify = dos_verify_disklabel, + .create = dos_create_disklabel, + .locate = dos_locate_disklabel, + .get_item = dos_get_disklabel_item, + .set_id = dos_set_disklabel_id, + + .get_part = dos_get_partition, + .set_part = dos_set_partition, + .add_part = dos_add_partition, + .del_part = dos_delete_partition, + .reorder = dos_reorder, + + .part_toggle_flag = dos_toggle_partition_flag, + .part_is_used = dos_partition_is_used, + + .reset_alignment = dos_reset_alignment, + + .deinit = dos_deinit, +}; + +/* + * allocates DOS in-memory stuff + */ +struct fdisk_label *fdisk_new_dos_label(struct fdisk_context *cxt __attribute__ ((__unused__))) +{ + struct fdisk_label *lb; + struct fdisk_dos_label *dos; + + dos = calloc(1, sizeof(*dos)); + if (!dos) + return NULL; + + /* initialize generic part of the driver */ + lb = (struct fdisk_label *) dos; + lb->name = "dos"; + lb->id = FDISK_DISKLABEL_DOS; + lb->op = &dos_operations; + + lb->parttypes = dos_parttypes; + lb->nparttypes = ARRAY_SIZE(dos_parttypes) - 1; + lb->parttype_cuts = dos_parttype_cuts; + lb->nparttype_cuts = ARRAY_SIZE(dos_parttype_cuts); + + lb->fields = dos_fields; + lb->nfields = ARRAY_SIZE(dos_fields); + + lb->geom_min.sectors = 1; + lb->geom_min.heads = 1; + lb->geom_min.cylinders = 1; + + lb->geom_max.sectors = 63; + lb->geom_max.heads = 255; + lb->geom_max.cylinders = 1048576; + + /* return calloc() result to keep static anaylizers happy */ + return (struct fdisk_label *) dos; +} + +/** + * fdisk_dos_enable_compatible: + * @lb: DOS label (see fdisk_get_label()) + * @enable: 0 or 1 + * + * Enables deprecated DOS compatible mode, in this mode library checks for + * cylinders boundary, cases about CHS addressing and another obscure things. + * + * Returns: 0 on success, <0 on error. + */ +int fdisk_dos_enable_compatible(struct fdisk_label *lb, int enable) +{ + struct fdisk_dos_label *dos = (struct fdisk_dos_label *) lb; + + if (!lb) + return -EINVAL; + + dos->compatible = enable; + if (enable) + lb->flags |= FDISK_LABEL_FL_REQUIRE_GEOMETRY; + return 0; +} + +/** + * fdisk_dos_is_compatible: + * @lb: DOS label + * + * Returns: 0 if DOS compatibility disabled, 1 if enabled + */ +int fdisk_dos_is_compatible(struct fdisk_label *lb) +{ + return ((struct fdisk_dos_label *) lb)->compatible; +} |