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sfdisk: add --no-tell-kernel 

The option forces sfdisk to not call re-read partitions ioctl after
write PT.

Requested-by: Scott Moser <smoser@ubuntu.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
This commit is contained in:
Karel Zak 2016-09-02 11:14:54 +02:00
parent 2862bda919
commit d4a90151e3
2 changed files with 17 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
disk-utils/sfdisk.8
View File

@ -158,6 +158,11 @@ Do everything except writing to the device.
.B \-\-no\-reread
Do not check through the re-read-partition-table ioctl whether the device is in use.
.TP
.B \-\-no\-tell\-kernel
Don't tell the kernel about partition changes. This option is recommended together
with \fB\-\-no\-reread\fR to modify a partition on used disk. The modified partition
should not be used (e.g. mounted).
.TP
.BR \-O , " \-\-backup\-file " \fIpath
Override the default backup file name. Note that the device name and offset
are always appended to the file name.

15
disk-utils/sfdisk.c
View File

@ -110,6 +110,7 @@ struct sfdisk {
append : 1, /* don't create new PT, append partitions only */
json : 1, /* JSON dump */
movedata: 1, /* move data after resize */
notell : 1, /* don't tell kernel aout new PT */
noact : 1; /* do not write to device */
};
@ -535,11 +536,13 @@ static int write_changes(struct sfdisk *sf)
rc = move_partition_data(sf, sf->partno, sf->orig_pa);
if (!rc) {
fdisk_info(sf->cxt, _("\nThe partition table has been altered."));
fdisk_reread_partition_table(sf->cxt);
if (!sf->notell)
fdisk_reread_partition_table(sf->cxt);
}
}
if (!rc)
rc = fdisk_deassign_device(sf->cxt, sf->noact); /* no-sync when no-act */
rc = fdisk_deassign_device(sf->cxt,
sf->noact || sf->notell); /* no-sync */
return rc;
}
@ -1824,6 +1827,7 @@ static void __attribute__ ((__noreturn__)) usage(FILE *out)
fputs(_(" -N, --partno <num> specify partition number\n"), out);
fputs(_(" -n, --no-act do everything except write to device\n"), out);
fputs(_(" --no-reread do not check whether the device is in use\n"), out);
fputs(_(" --no-tell-kernel do not tell kernel about changes\n"), out);
fputs(_(" -O, --backup-file <path> override default backup file name\n"), out);
fputs(_(" -o, --output <list> output columns\n"), out);
fputs(_(" -q, --quiet suppress extra info messages\n"), out);
@ -1871,7 +1875,8 @@ int main(int argc, char *argv[])
OPT_BYTES,
OPT_COLOR,
OPT_MOVEDATA,
OPT_DELETE
OPT_DELETE,
OPT_NOTELL
};
static const struct option longopts[] = {
@ -1893,6 +1898,7 @@ int main(int argc, char *argv[])
{ "list-types", no_argument, NULL, 'T' },
{ "no-act", no_argument, NULL, 'n' },
{ "no-reread", no_argument, NULL, OPT_NOREREAD },
{ "no-tell-kernel", no_argument, NULL, OPT_NOTELL },
{ "move-data", optional_argument, NULL, OPT_MOVEDATA },
{ "output", required_argument, NULL, 'o' },
{ "partno", required_argument, NULL, 'N' },
@ -2059,6 +2065,9 @@ int main(int argc, char *argv[])
case OPT_DELETE:
sf->act = ACT_DELETE;
break;
case OPT_NOTELL:
sf->notell = 1;
break;
default:
usage(stderr);
}