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btrfs-progs: make the device scan logic more clear

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1. Use long option to replace the original strcmp() to parse
the "--all-devices".
2. the "int ret" is defined in 2 places, just define it once
and make the return pattern into "goto + single return".

This does not change the actual scan procedure and return values.
Just make it clear, the original seems a little confusing.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Gui Hecheng 2014-03-06 11:36:48 +08:00 committed by Chris Mason
parent 6831721a43
commit 0e1b00c666
1 changed files with 39 additions and 22 deletions
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61
cmds-device.c
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@ -187,51 +187,67 @@ static int cmd_rm_dev(int argc, char **argv)
}
static const char * const cmd_scan_dev_usage[] = {
"btrfs device scan [<--all-devices>|<device> [<device>...]]",
"btrfs device scan [options] [<device> [<device>...]]",
"Scan devices for a btrfs filesystem",
"-d|--all-devices scan all devices under /dev",
NULL
};
static int cmd_scan_dev(int argc, char **argv)
{
int i, fd, e;
int where = BTRFS_SCAN_LBLKID;
int devstart = 1;
int i, fd, e;
int where = BTRFS_SCAN_LBLKID;
int devstart = 1;
int all = 0;
int ret = 0;
if( argc > 1 && !strcmp(argv[1],"--all-devices")){
if (check_argc_max(argc, 2))
optind = 1;
while (1) {
int long_index;
static struct option long_options[] = {
{ "all-devices", no_argument, NULL, 'd'},
{ 0, 0, 0, 0 },
};
int c = getopt_long(argc, argv, "d", long_options,
&long_index);
if (c < 0)
break;
switch (c) {
case 'd':
where = BTRFS_SCAN_DEV;
all = 1;
break;
default:
usage(cmd_scan_dev_usage);
where = BTRFS_SCAN_DEV;
devstart += 1;
}
}
if(argc<=devstart){
int ret;
if (all && check_argc_max(argc, 2))
usage(cmd_scan_dev_usage);
if (all || argc == 1) {
printf("Scanning for Btrfs filesystems\n");
ret = scan_for_btrfs(where, BTRFS_UPDATE_KERNEL);
if (ret){
if (ret)
fprintf(stderr, "ERROR: error %d while scanning\n", ret);
return 1;
}
return 0;
goto out;
}
fd = open("/dev/btrfs-control", O_RDWR);
if (fd < 0) {
perror("failed to open /dev/btrfs-control");
return 1;
ret = 1;
goto out;
}
for( i = devstart ; i < argc ; i++ ){
struct btrfs_ioctl_vol_args args;
int ret;
if (!is_block_device(argv[i])) {
fprintf(stderr,
"ERROR: %s is not a block device\n", argv[i]);
close(fd);
return 1;
ret = 1;
goto close_out;
}
printf("Scanning for Btrfs filesystems in '%s'\n", argv[i]);
@ -245,15 +261,16 @@ static int cmd_scan_dev(int argc, char **argv)
e = errno;
if( ret < 0 ){
close(fd);
fprintf(stderr, "ERROR: unable to scan the device '%s' - %s\n",
argv[i], strerror(e));
return 1;
goto close_out;
}
}
close_out:
close(fd);
return 0;
out:
return !!ret;
}
static const char * const cmd_ready_dev_usage[] = {