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authorDenys Vlasenko <vda.linux@googlemail.com>2010-04-06 00:32:26 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2010-04-06 00:32:26 (GMT)
commitd958e909cdf40bdf5379f22faaa83d255ec6dc09 (patch)
treeb3eed999aadaebafe8b814b591416be2f2a739a6
parent5ea1de2235e75d8fd4f559c7c6cca9a2d0396094 (diff)
downloadbusybox-d958e909cdf40bdf5379f22faaa83d255ec6dc09.tar.gz
busybox-d958e909cdf40bdf5379f22faaa83d255ec6dc09.tar.bz2
fdisk: make 'b' command optionally adjust C/H/S; "fdisk IMAGE_FILE" sets cylinders
function old new delta set_hsc_start_end - 189 +189 get_boot 1644 1713 +69 fdisk_main 2620 2652 +32 get_partition_start_from_dev_start - 15 +15 get_partition_start 15 - -15 set_partition 286 120 -166 ------------------------------------------------------------------------------ (add/remove: 2/1 grow/shrink: 2/1 up/down: 305/-181) Total: 124 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--util-linux/fdisk.c163
1 files changed, 89 insertions, 74 deletions
diff --git a/util-linux/fdisk.c b/util-linux/fdisk.c
index cb15bd2..06fb7f9 100644
--- a/util-linux/fdisk.c
+++ b/util-linux/fdisk.c
@@ -185,7 +185,7 @@ static sector_t get_nr_sects(const struct partition *p);
struct pte {
struct partition *part_table; /* points into sectorbuffer */
struct partition *ext_pointer; /* points into sectorbuffer */
- sector_t offset; /* disk sector number */
+ sector_t offset_from_dev_start; /* disk sector number */
char *sectorbuffer; /* disk sector contents */
#if ENABLE_FEATURE_FDISK_WRITABLE
char changed; /* boolean */
@@ -407,8 +407,14 @@ static sector_t bb_BLKGETSIZE_sectors(int fd)
return v64;
}
/* Needs temp of type long */
- if (ioctl(fd, BLKGETSIZE, &longsectors))
+ if (ioctl(fd, BLKGETSIZE, &longsectors)) {
+ /* Perhaps this is a disk image */
+ off_t sz = lseek(fd, 0, SEEK_END);
longsectors = 0;
+ if (sz > 0)
+ longsectors = (uoff_t)sz / sector_size;
+ lseek(fd, 0, SEEK_SET);
+ }
if (sizeof(long) > sizeof(sector_t)
&& longsectors != (sector_t)longsectors
) {
@@ -435,16 +441,6 @@ static sector_t bb_BLKGETSIZE_sectors(int fd)
#define hsc2sector(h,s,c) \
(sector(s) - 1 + sectors * ((h) + heads * cylinder(s,c)))
-#define set_hsc(h,s,c,sector) \
- do { \
- s = sector % g_sectors + 1; \
- sector /= g_sectors; \
- h = sector % g_heads; \
- sector /= g_heads; \
- c = sector & 0xff; \
- s |= (sector >> 2) & 0xc0; \
- } while (0)
-
static void
close_dev_fd(void)
{
@@ -603,7 +599,7 @@ read_hex(const char *const *sys)
unsigned long v;
while (1) {
read_nonempty("Hex code (type L to list codes): ");
- if (*line_ptr == 'l' || *line_ptr == 'L') {
+ if ((line_ptr[0] | 0x20) == 'l') {
list_types(sys);
continue;
}
@@ -759,7 +755,7 @@ set_nr_sects(struct partition *p, unsigned nr_sects)
static void
read_pte(struct pte *pe, sector_t offset)
{
- pe->offset = offset;
+ pe->offset_from_dev_start = offset;
pe->sectorbuffer = xzalloc(sector_size);
seek_sector(offset);
/* xread would make us abort - bad for fdisk -l */
@@ -772,9 +768,9 @@ read_pte(struct pte *pe, sector_t offset)
}
static sector_t
-get_partition_start(const struct pte *pe)
+get_partition_start_from_dev_start(const struct pte *pe)
{
- return pe->offset + get_start_sect(pe->part_table);
+ return pe->offset_from_dev_start + get_start_sect(pe->part_table);
}
#if ENABLE_FEATURE_FDISK_WRITABLE
@@ -1012,6 +1008,27 @@ list_types(const char *const *sys)
bb_putchar('\n');
}
+#define set_hsc(h, s, c, sector) do \
+{ \
+ s = sector % g_sectors + 1; \
+ sector /= g_sectors; \
+ h = sector % g_heads; \
+ sector /= g_heads; \
+ c = sector & 0xff; \
+ s |= (sector >> 2) & 0xc0; \
+} while (0)
+
+static void set_hsc_start_end(struct partition *p, sector_t start, sector_t stop)
+{
+ if (dos_compatible_flag && (start / (g_sectors * g_heads) > 1023))
+ start = g_heads * g_sectors * 1024 - 1;
+ set_hsc(p->head, p->sector, p->cyl, start);
+
+ if (dos_compatible_flag && (stop / (g_sectors * g_heads) > 1023))
+ stop = g_heads * g_sectors * 1024 - 1;
+ set_hsc(p->end_head, p->end_sector, p->end_cyl, stop);
+}
+
static void
set_partition(int i, int doext, sector_t start, sector_t stop, int sysid)
{
@@ -1023,18 +1040,13 @@ set_partition(int i, int doext, sector_t start, sector_t stop, int sysid)
offset = extended_offset;
} else {
p = ptes[i].part_table;
- offset = ptes[i].offset;
+ offset = ptes[i].offset_from_dev_start;
}
p->boot_ind = 0;
p->sys_ind = sysid;
set_start_sect(p, start - offset);
set_nr_sects(p, stop - start + 1);
- if (dos_compatible_flag && (start / (g_sectors * g_heads) > 1023))
- start = g_heads * g_sectors * 1024 - 1;
- set_hsc(p->head, p->sector, p->cyl, start);
- if (dos_compatible_flag && (stop / (g_sectors * g_heads) > 1023))
- stop = g_heads * g_sectors * 1024 - 1;
- set_hsc(p->end_head, p->end_sector, p->end_cyl, stop);
+ set_hsc_start_end(p, start, stop);
ptes[i].changed = 1;
}
#endif
@@ -1316,7 +1328,7 @@ static int get_boot(void)
struct pte *pe = &ptes[i];
pe->part_table = pt_offset(MBRbuffer, i);
pe->ext_pointer = NULL;
- pe->offset = 0;
+ pe->offset_from_dev_start = 0;
pe->sectorbuffer = MBRbuffer;
#if ENABLE_FEATURE_FDISK_WRITABLE
pe->changed = (what == CREATE_EMPTY_DOS);
@@ -1700,9 +1712,9 @@ delete_partition(int i)
if (pe->part_table) /* prevent SEGFAULT */
set_start_sect(pe->part_table,
- get_partition_start(pe) -
+ get_partition_start_from_dev_start(pe) -
extended_offset);
- pe->offset = extended_offset;
+ pe->offset_from_dev_start = extended_offset;
pe->changed = 1;
}
@@ -1914,7 +1926,7 @@ wrong_p_order(int *prev)
pe = &ptes[i];
p = pe->part_table;
if (p->sys_ind) {
- p_start_pos = get_partition_start(pe);
+ p_start_pos = get_partition_start_from_dev_start(pe);
if (last_p_start_pos > p_start_pos) {
if (prev)
@@ -1953,11 +1965,11 @@ fix_chain_of_logicals(void)
/* (Its sector is the global extended_offset.) */
stage1:
for (j = 5; j < g_partitions - 1; j++) {
- oj = ptes[j].offset;
- ojj = ptes[j+1].offset;
+ oj = ptes[j].offset_from_dev_start;
+ ojj = ptes[j+1].offset_from_dev_start;
if (oj > ojj) {
- ptes[j].offset = ojj;
- ptes[j+1].offset = oj;
+ ptes[j].offset_from_dev_start = ojj;
+ ptes[j+1].offset_from_dev_start = oj;
pj = ptes[j].part_table;
set_start_sect(pj, get_start_sect(pj)+oj-ojj);
pjj = ptes[j+1].part_table;
@@ -1977,8 +1989,8 @@ fix_chain_of_logicals(void)
pjj = ptes[j+1].part_table;
sj = get_start_sect(pj);
sjj = get_start_sect(pjj);
- oj = ptes[j].offset;
- ojj = ptes[j+1].offset;
+ oj = ptes[j].offset_from_dev_start;
+ ojj = ptes[j+1].offset_from_dev_start;
if (oj+sj > ojj+sjj) {
tmp = *pj;
*pj = *pjj;
@@ -2095,8 +2107,8 @@ list_table(int xtra)
partname(disk_device, i+1, w+2),
!p->boot_ind ? ' ' : p->boot_ind == ACTIVE_FLAG /* boot flag */
? '*' : '?',
- cround(get_partition_start(pe)), /* start */
- cround(get_partition_start(pe) + psects /* end */
+ cround(get_partition_start_from_dev_start(pe)), /* start */
+ cround(get_partition_start_from_dev_start(pe) + psects /* end */
- (psects ? 1 : 0)),
pblocks, podd ? '+' : ' ', /* odd flag on end */
p->sys_ind, /* type id */
@@ -2158,7 +2170,7 @@ fill_bounds(sector_t *first, sector_t *last)
first[i] = 0xffffffff;
last[i] = 0;
} else {
- first[i] = get_partition_start(pe);
+ first[i] = get_partition_start_from_dev_start(pe);
last[i] = first[i] + get_nr_sects(p) - 1;
}
}
@@ -2215,7 +2227,7 @@ verify(void)
p = pe->part_table;
if (p->sys_ind && !IS_EXTENDED(p->sys_ind)) {
check_consistency(p, i);
- if (get_partition_start(pe) < first[i])
+ if (get_partition_start_from_dev_start(pe) < first[i])
printf("Warning: bad start-of-data in "
"partition %u\n", i + 1);
check(i + 1, p->end_head, p->end_sector, p->end_cyl,
@@ -2305,7 +2317,7 @@ add_partition(int n, int sys)
for (i = 0; i < g_partitions; i++) {
int lastplusoff;
- if (start == ptes[i].offset)
+ if (start == ptes[i].offset_from_dev_start)
start += sector_offset;
lastplusoff = last[i] + ((n < 4) ? 0 : sector_offset);
if (start >= first[i] && start <= lastplusoff)
@@ -2322,8 +2334,7 @@ add_partition(int n, int sys)
sector_t saved_start;
saved_start = start;
- start = read_int(cround(saved_start), cround(saved_start), cround(limit),
- 0, mesg);
+ start = read_int(cround(saved_start), cround(saved_start), cround(limit), 0, mesg);
if (display_in_cyl_units) {
start = (start - 1) * units_per_sector;
if (start < saved_start)
@@ -2335,9 +2346,9 @@ add_partition(int n, int sys)
if (n > 4) { /* NOT for fifth partition */
struct pte *pe = &ptes[n];
- pe->offset = start - sector_offset;
- if (pe->offset == extended_offset) { /* must be corrected */
- pe->offset++;
+ pe->offset_from_dev_start = start - sector_offset;
+ if (pe->offset_from_dev_start == extended_offset) { /* must be corrected */
+ pe->offset_from_dev_start++;
if (sector_offset == 1)
start++;
}
@@ -2346,8 +2357,8 @@ add_partition(int n, int sys)
for (i = 0; i < g_partitions; i++) {
struct pte *pe = &ptes[i];
- if (start < pe->offset && limit >= pe->offset)
- limit = pe->offset - 1;
+ if (start < pe->offset_from_dev_start && limit >= pe->offset_from_dev_start)
+ limit = pe->offset_from_dev_start - 1;
if (start < first[i] && limit >= first[i])
limit = first[i] - 1;
}
@@ -2363,8 +2374,7 @@ add_partition(int n, int sys)
snprintf(mesg, sizeof(mesg),
"Last %s or +size or +sizeM or +sizeK",
str_units(SINGULAR));
- stop = read_int(cround(start), cround(limit), cround(limit),
- cround(start), mesg);
+ stop = read_int(cround(start), cround(limit), cround(limit), cround(start), mesg);
if (display_in_cyl_units) {
stop = stop * units_per_sector - 1;
if (stop >limit)
@@ -2374,7 +2384,7 @@ add_partition(int n, int sys)
set_partition(n, 0, start, stop, sys);
if (n > 4)
- set_partition(n - 1, 1, ptes[n].offset, stop, EXTENDED);
+ set_partition(n - 1, 1, ptes[n].offset_from_dev_start, stop, EXTENDED);
if (IS_EXTENDED(sys)) {
struct pte *pe4 = &ptes[4];
@@ -2382,7 +2392,7 @@ add_partition(int n, int sys)
ext_index = n;
pen->ext_pointer = p;
- pe4->offset = extended_offset = start;
+ pe4->offset_from_dev_start = extended_offset = start;
pe4->sectorbuffer = xzalloc(sector_size);
pe4->part_table = pt_offset(pe4->sectorbuffer, 0);
pe4->ext_pointer = pe4->part_table + 1;
@@ -2400,7 +2410,7 @@ add_logical(void)
pe->sectorbuffer = xzalloc(sector_size);
pe->part_table = pt_offset(pe->sectorbuffer, 0);
pe->ext_pointer = pe->part_table + 1;
- pe->offset = 0;
+ pe->offset_from_dev_start = 0;
pe->changed = 1;
g_partitions++;
}
@@ -2454,7 +2464,7 @@ new_partition(void)
"l logical (5 or over)" : "e extended"));
while (1) {
c = read_nonempty(line);
- if (c == 'p' || c == 'P') {
+ if ((c | 0x20) == 'p') {
i = get_nonexisting_partition(0, 4);
if (i >= 0)
add_partition(i, LINUX_NATIVE);
@@ -2490,7 +2500,7 @@ write_table(void)
if (pe->changed) {
write_part_table_flag(pe->sectorbuffer);
- write_sector(pe->offset, pe->sectorbuffer);
+ write_sector(pe->offset_from_dev_start, pe->sectorbuffer);
}
}
}
@@ -2579,22 +2589,26 @@ move_begin(unsigned i)
{
struct pte *pe = &ptes[i];
struct partition *p = pe->part_table;
- sector_t new, first;
+ sector_t new, first, nr_sects;
if (warn_geometry())
return;
- if (!p->sys_ind || !get_nr_sects(p) || IS_EXTENDED(p->sys_ind)) {
+ nr_sects = get_nr_sects(p);
+ if (!p->sys_ind || !nr_sects || IS_EXTENDED(p->sys_ind)) {
printf("Partition %u has no data area\n", i + 1);
return;
}
- first = get_partition_start(pe);
- new = read_int(first, first, first + get_nr_sects(p) - 1, first,
- "New beginning of data") - pe->offset;
-
- if (new != get_nr_sects(p)) {
- first = get_nr_sects(p) + get_start_sect(p) - new;
- set_nr_sects(p, first);
- set_start_sect(p, new);
+ first = get_partition_start_from_dev_start(pe);
+ /* == pe->offset_from_dev_start + get_start_sect(p) */
+ new = read_int(0 /*was:first*/, first, first + nr_sects - 1, first, "New beginning of data");
+ if (new != first) {
+ sector_t new_relative = new - pe->offset_from_dev_start;
+ nr_sects += (get_start_sect(p) - new_relative);
+ set_start_sect(p, new_relative);
+ set_nr_sects(p, nr_sects);
+ read_nonempty("Recalculate C/H/S values? (Y/N): ");
+ if ((line_ptr[0] | 0x20) == 'y')
+ set_hsc_start_end(p, new, new + nr_sects - 1);
pe->changed = 1;
}
}
@@ -2606,7 +2620,7 @@ xselect(void)
while (1) {
bb_putchar('\n');
- c = tolower(read_nonempty("Expert command (m for help): "));
+ c = 0x20 | read_nonempty("Expert command (m for help): ");
switch (c) {
case 'a':
if (LABEL_IS_SUN)
@@ -2646,8 +2660,7 @@ xselect(void)
#endif
break;
case 'h':
- user_heads = g_heads = read_int(1, g_heads, 256, 0,
- "Number of heads");
+ user_heads = g_heads = read_int(1, g_heads, 256, 0, "Number of heads");
update_units();
break;
case 'i':
@@ -2672,8 +2685,7 @@ xselect(void)
case 'r':
return;
case 's':
- user_sectors = g_sectors = read_int(1, g_sectors, 63, 0,
- "Number of sectors");
+ user_sectors = g_sectors = read_int(1, g_sectors, 63, 0, "Number of sectors");
if (dos_compatible_flag) {
sector_offset = g_sectors;
printf("Warning: setting sector offset for DOS "
@@ -2834,14 +2846,17 @@ int fdisk_main(int argc UNUSED_PARAM, char **argv)
opt = getopt32(argv, "b:C:H:lS:u" IF_FEATURE_FDISK_BLKSIZE("s"),
&sector_size, &user_cylinders, &user_heads, &user_sectors);
argv += optind;
- if (opt & OPT_b) { // -b
+ if (opt & OPT_b) {
/* Ugly: this sector size is really per device,
- so cannot be combined with multiple disks,
- and the same goes for the C/H/S options.
- */
- if (sector_size != 512 && sector_size != 1024
- && sector_size != 2048)
+ * so cannot be combined with multiple disks,
+ * and the same goes for the C/H/S options.
+ */
+ if (sector_size < 512
+ || sector_size > 0x10000
+ || (sector_size & (sector_size-1)) /* not power of 2 */
+ ) {
bb_show_usage();
+ }
sector_offset = 2;
user_set_sector_size = 1;
}
@@ -2912,7 +2927,7 @@ int fdisk_main(int argc UNUSED_PARAM, char **argv)
while (1) {
int c;
bb_putchar('\n');
- c = tolower(read_nonempty("Command (m for help): "));
+ c = 0x20 | read_nonempty("Command (m for help): ");
switch (c) {
case 'a':
if (LABEL_IS_DOS)