static int cmd_rm_dev(int argc, char **argv)
{
char *mntpnt;
int i, fdmnt, ret=0, e;
DIR *dirstream = NULL;
if (check_argc_min(argc, 3))
usage(cmd_rm_dev_usage);
mntpnt = argv[argc - 1];
fdmnt = open_file_or_dir(mntpnt, &dirstream);
if (fdmnt < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", mntpnt);
return 1;
}
for(i=1 ; i < argc - 1; i++ ){
struct btrfs_ioctl_vol_args arg;
int res;
if (!is_block_device(argv[i])) {
fprintf(stderr,
"ERROR: %s is not a block device\n", argv[i]);
ret++;
continue;
}
memset(&arg, 0, sizeof(arg));
strncpy_null(arg.name, argv[i]);
res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
e = errno;
if (res) {
const char *msg;
if (res > 0)
msg = btrfs_err_str(res);
else
msg = strerror(e);
fprintf(stderr,
"ERROR: error removing the device '%s' - %s\n",
argv[i], msg);
ret++;
}
}
close_file_or_dir(fdmnt, dirstream);
return !!ret;
}
static int _cmd_device_remove(int argc, char **argv,
const char * const *usagestr)
{
char *mntpnt;
int i, fdmnt, ret = 0;
DIR *dirstream = NULL;
clean_args_no_options(argc, argv, usagestr);
if (check_argc_min(argc - optind, 2))
usage(usagestr);
mntpnt = argv[argc - 1];
fdmnt = btrfs_open_dir(mntpnt, &dirstream, 1);
if (fdmnt < 0)
return 1;
for(i = optind; i < argc - 1; i++) {
struct btrfs_ioctl_vol_args arg;
struct btrfs_ioctl_vol_args_v2 argv2 = {0};
int is_devid = 0;
int res;
if (string_is_numerical(argv[i])) {
argv2.devid = arg_strtou64(argv[i]);
argv2.flags = BTRFS_DEVICE_SPEC_BY_ID;
is_devid = 1;
} else if (is_block_device(argv[i]) == 1 ||
strcmp(argv[i], "missing") == 0) {
strncpy_null(argv2.name, argv[i]);
} else {
error("not a block device: %s", argv[i]);
ret++;
continue;
}
/*
* Positive values are from BTRFS_ERROR_DEV_*,
* otherwise it's a generic error, one of errnos
*/
res = ioctl(fdmnt, BTRFS_IOC_RM_DEV_V2, &argv2);
/*
* If BTRFS_IOC_RM_DEV_V2 is not supported we get ENOTTY and if
* argv2.flags includes a flag which kernel doesn't understand then
* we shall get EOPNOTSUPP
*/
if (res < 0 && (errno == ENOTTY || errno == EOPNOTSUPP)) {
if (is_devid) {
error("device delete by id failed: %m");
ret++;
continue;
}
memset(&arg, 0, sizeof(arg));
strncpy_null(arg.name, argv[i]);
res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
}
if (res) {
const char *msg;
if (res > 0)
msg = btrfs_err_str(res);
else
msg = strerror(errno);
if (is_devid) {
error("error removing devid %llu: %s",
(unsigned long long)argv2.devid, msg);
} else {
error("error removing device '%s': %s",
argv[i], msg);
}
ret++;
}
}
close_file_or_dir(fdmnt, dirstream);
return !!ret;
}
static int do_balance(const char *path, struct btrfs_ioctl_balance_args *args,
unsigned flags)
{
int fd;
int ret;
DIR *dirstream = NULL;
fd = btrfs_open_dir(path, &dirstream, 1);
if (fd < 0)
return 1;
if (!(flags & BALANCE_START_FILTERS) && !(flags & BALANCE_START_NOWARN)) {
int delay = 10;
printf("WARNING:\n\n");
printf("\tFull balance without filters requested. This operation is very\n");
printf("\tintense and takes potentially very long. It is recommended to\n");
printf("\tuse the balance filters to narrow down the scope of balance.\n");
printf("\tUse 'btrfs balance start --full-balance' option to skip this\n");
printf("\twarning. The operation will start in %d seconds.\n", delay);
printf("\tUse Ctrl-C to stop it.\n");
while (delay) {
printf("%2d", delay--);
fflush(stdout);
sleep(1);
}
printf("\nStarting balance without any filters.\n");
}
ret = ioctl(fd, BTRFS_IOC_BALANCE_V2, args);
if (ret < 0) {
/*
* older kernels don't have the new balance ioctl, try the
* old one. But, the old one doesn't know any filters, so
* don't fall back if they tried to use the fancy new things
*/
if (errno == ENOTTY && !(flags & BALANCE_START_FILTERS)) {
ret = do_balance_v1(fd);
if (ret == 0)
goto out;
}
if (errno == ECANCELED) {
if (args->state & BTRFS_BALANCE_STATE_PAUSE_REQ)
fprintf(stderr, "balance paused by user\n");
if (args->state & BTRFS_BALANCE_STATE_CANCEL_REQ)
fprintf(stderr, "balance canceled by user\n");
ret = 0;
} else {
error("error during balancing '%s': %m", path);
if (errno != EINPROGRESS)
fprintf(stderr,
"There may be more info in syslog - try dmesg | tail\n");
ret = 1;
}
} else if (ret > 0) {
error("balance: %s", btrfs_err_str(ret));
} else {
printf("Done, had to relocate %llu out of %llu chunks\n",
(unsigned long long)args->stat.completed,
(unsigned long long)args->stat.considered);
}
out:
close_file_or_dir(fd, dirstream);
return ret;
}
