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partx: add --sector-size option 

/dev/sdc is 4K disk:

 # fdisk -l /dev/sdc
 Disk /dev/sdc: 100 MiB, 104857600 bytes, 25600 sectors
 ...
 Device     Boot Start   End Sectors Size Id Type
 /dev/sdc1        1024 25599   24576  96M 83 Linux

let's use it as disk image:

 # dd if=/dev/sdc of=~/sdc.img
 # losetup -f ~/sdc.img

old version:

 # partx --show /dev/loop0
 NR START   END SECTORS SIZE NAME UUID
 1  1024 25599   24576  12M      6a4ba75b-01

new version:

 # partx --show /dev/loop0 --sector-size 4096
 NR START    END SECTORS SIZE NAME UUID
  1  8192 204799  196608  96M      6a4ba75b-01

Addresses: https://github.com/karelzak/util-linux/issues/396
Signed-off-by: Karel Zak <kzak@redhat.com>
This commit is contained in:
Karel Zak 2017-01-13 13:30:22 +01:00
parent 76fab513b8
commit f8a4a0d4f2
2 changed files with 15 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
disk-utils/partx.8
View File

@ -136,6 +136,9 @@ or
.BR \-u , " \-\-update"
Update the specified partitions.
.TP
.BR \-S , " \-\-sector\-size " \fIsize
Overwrite default sector size.
.TP
.BR \-v , " \-\-verbose"
Verbose mode.
.TP

14
disk-utils/partx.c
View File

@ -766,6 +766,7 @@ static void __attribute__((__noreturn__)) usage(FILE *out)
fputs(_(" -o, --output <list> define which output columns to use\n"), out);
fputs(_(" -P, --pairs use key=\"value\" output format\n"), out);
fputs(_(" -r, --raw use raw output format\n"), out);
fputs(_(" -S, --sector-size <num> overwrite sector size\n"), out);
fputs(_(" -t, --type <type> specify the partition type (dos, bsd, solaris, etc.)\n"), out);
fputs(_(" -v, --verbose verbose mode\n"), out);
@ -792,6 +793,7 @@ int main(int argc, char **argv)
char *wholedisk = NULL; /* allocated, ie: /dev/sda */
char *outarg = NULL;
dev_t disk_devno = 0, part_devno = 0;
unsigned int sector_size = 0;
static const struct option long_opts[] = {
{ "bytes", no_argument, NULL, 'b' },
@ -806,6 +808,7 @@ int main(int argc, char **argv)
{ "nr", required_argument, NULL, 'n' },
{ "output", required_argument, NULL, 'o' },
{ "pairs", no_argument, NULL, 'P' },
{ "sector-size",required_argument, NULL, 'S' },
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'V' },
{ "verbose", no_argument, NULL, 'v' },
@ -824,7 +827,7 @@ int main(int argc, char **argv)
atexit(close_stdout);
while ((c = getopt_long(argc, argv,
"abdglrsuvn:t:o:PhV", long_opts, NULL)) != -1) {
"abdglrsuvn:t:o:PS:hV", long_opts, NULL)) != -1) {
err_exclusive_options(c, long_opts, excl, excl_st);
@ -862,6 +865,9 @@ int main(int argc, char **argv)
case 's':
what = ACT_SHOW;
break;
case 'S':
sector_size = strtou32_or_err(optarg, _("invalid sector size argument"));
break;
case 't':
type = optarg;
break;
@ -1001,8 +1007,12 @@ int main(int argc, char **argv)
if (!pr || blkid_probe_set_device(pr, fd, 0, 0))
warnx(_("%s: failed to initialize blkid prober"),
wholedisk);
else
else {
if (sector_size)
blkid_probe_set_sectorsize(pr, sector_size);
ls = get_partlist(pr, wholedisk, type);
}
if (ls) {
switch (what) {