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Better usage message.

Browse Source 
Invoking bcachectl will now show you a help
message and a usage indicator.

Change-Id: I9f6163b196b32723c21ddbce04d4a20015173a1a
Signed-off-by: Surbhi Palande <sap@daterainc.com>
This commit is contained in:
Surbhi Palande 2014-08-05 16:19:48 -07:00 committed by Surbhi Palande
parent 73ef76c1c0
commit 59a6730a02
1 changed files with 8 additions and 7 deletions
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15
bcachectl.c
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@ -14,7 +14,6 @@ int bcachefd;
static int register_devices(int argc, char *argv[]) static int register_devices(int argc, char *argv[])
{ {
int ret; int ret;
ret = ioctl(bcachefd, BCH_IOCTL_REGISTER, argv); ret = ioctl(bcachefd, BCH_IOCTL_REGISTER, argv);
if (ret < 0) { if (ret < 0) {
fprintf(stderr, "ioctl error %d", ret); fprintf(stderr, "ioctl error %d", ret);
@ -25,21 +24,23 @@ static int register_devices(int argc, char *argv[])
int main(int argc, char *argv[]) int main(int argc, char *argv[])
{ {
char *ioctl = argv[2]; char *ioctl = argv[1];
if (argc < 3) { if (argc < 3) {
fprintf(stderr, "Enter bcache device and an ioctl to issue\n"); fprintf(stderr, " <Usage> %s <action> <space separated list of devices>", argv[0]);
fprintf(stderr, "\n <Help> Possible actions are: \n");
fprintf(stderr, " \t 1. register_devices\n");
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
bcachefd = open(argv[1], O_RDWR); bcachefd = open("/dev/bcache", O_RDWR);
if (bcachefd < 0) { if (bcachefd < 0) {
perror("Can't open bcache device"); perror("Can't open bcache device");
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
argc -= 3; argc -= 2;
argv += 3; argv += 2;
if (!strcmp(ioctl, "register_devices")) if (!strcmp(ioctl, "register_devices"))
return register_devices(argc, argv); return register_devices(argc, argv);
@ -47,5 +48,5 @@ int main(int argc, char *argv[])
fprintf(stderr, "Unknown ioctl\n"); fprintf(stderr, "Unknown ioctl\n");
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
return 0;
} }