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btrfs-progs/cmds/balance.c

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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include "kerncompat.h"
#include <sys/ioctl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <fcntl.h>
#include <errno.h>
#include <dirent.h>
#include <stdbool.h>
#include "kernel-shared/uapi/btrfs.h"
#include "kernel-shared/ctree.h"
#include "kernel-shared/volumes.h"
#include "common/open-utils.h"
#include "common/utils.h"
#include "common/parse-utils.h"
#include "common/messages.h"
#include "common/help.h"
#include "cmds/commands.h"
static const char * const balance_cmd_group_usage[] = {
"btrfs balance <command> [options] <path>",
"btrfs balance <path> (deprecated, use 'btrfs balance start')",
NULL
};
static int parse_one_profile(const char *profile, u64 *flags)
{
int ret;
u64 tmp = 0;
ret = parse_bg_profile(profile, &tmp);
if (ret) {
error("unknown profile: %s", profile);
return 1;
}
if (tmp == 0)
tmp = BTRFS_AVAIL_ALLOC_BIT_SINGLE;
*flags |= tmp;
return ret;
}
static int parse_profiles(char *profiles, u64 *flags)
{
char *this_char;
char *save_ptr = NULL; /* Satisfy static checkers */
for (this_char = strtok_r(profiles, "|", &save_ptr);
this_char != NULL;
this_char = strtok_r(NULL, "|", &save_ptr)) {
if (parse_one_profile(this_char, flags))
return 1;
}
return 0;
}
__attribute__ ((unused))
static void print_range(u64 start, u64 end)
{
if (start)
printf("%llu", start);
printf("..");
if (end != (u64)-1)
printf("%llu", end);
}
__attribute__ ((unused))
static void print_range_u32(u32 start, u32 end)
{
if (start)
printf("%u", start);
printf("..");
if (end != (u32)-1)
printf("%u", end);
}
static int parse_filters(char *filters, struct btrfs_balance_args *args)
{
char *this_char;
char *value;
char *save_ptr = NULL; /* Satisfy static checkers */
if (!filters)
return 0;
for (this_char = strtok_r(filters, ",", &save_ptr);
this_char != NULL;
this_char = strtok_r(NULL, ",", &save_ptr)) {
if ((value = strchr(this_char, '=')) != NULL)
*value++ = 0;
if (!strcmp(this_char, "profiles")) {
if (!value || !*value) {
error("the profiles filter requires an argument");
return 1;
}
if (parse_profiles(value, &args->profiles)) {
error("invalid profiles argument");
return 1;
}
args->flags |= BTRFS_BALANCE_ARGS_PROFILES;
} else if (!strcmp(this_char, "usage")) {
if (!value || !*value) {
error("the usage filter requires an argument");
return 1;
}
if (parse_u64(value, &args->usage)) {
if (parse_range_u32(value, &args->usage_min,
&args->usage_max)) {
error("invalid usage argument: %s",
value);
return 1;
}
if (args->usage_max > 100) {
error("invalid usage argument: %s",
value);
}
args->flags &= ~BTRFS_BALANCE_ARGS_USAGE;
args->flags |= BTRFS_BALANCE_ARGS_USAGE_RANGE;
} else {
if (args->usage > 100) {
error("invalid usage argument: %s",
value);
return 1;
}
args->flags &= ~BTRFS_BALANCE_ARGS_USAGE_RANGE;
args->flags |= BTRFS_BALANCE_ARGS_USAGE;
}
args->flags |= BTRFS_BALANCE_ARGS_USAGE;
} else if (!strcmp(this_char, "devid")) {
if (!value || !*value) {
error("the devid filter requires an argument");
return 1;
}
if (parse_u64(value, &args->devid) || args->devid == 0) {
error("invalid devid argument: %s", value);
return 1;
}
args->flags |= BTRFS_BALANCE_ARGS_DEVID;
} else if (!strcmp(this_char, "drange")) {
if (!value || !*value) {
error("the drange filter requires an argument");
return 1;
}
if (parse_range_strict(value, &args->pstart, &args->pend)) {
error("invalid drange argument");
return 1;
}
args->flags |= BTRFS_BALANCE_ARGS_DRANGE;
} else if (!strcmp(this_char, "vrange")) {
if (!value || !*value) {
error("the vrange filter requires an argument");
return 1;
}
if (parse_range_strict(value, &args->vstart, &args->vend)) {
error("invalid vrange argument");
return 1;
}
args->flags |= BTRFS_BALANCE_ARGS_VRANGE;
} else if (!strcmp(this_char, "convert")) {
if (!value || !*value) {
error("the convert option requires an argument");
return 1;
}
if (parse_one_profile(value, &args->target)) {
error("invalid convert argument");
return 1;
}
args->flags |= BTRFS_BALANCE_ARGS_CONVERT;
} else if (!strcmp(this_char, "soft")) {
args->flags |= BTRFS_BALANCE_ARGS_SOFT;
} else if (!strcmp(this_char, "limit")) {
if (!value || !*value) {
error("the limit filter requires an argument");
return 1;
}
if (parse_u64(value, &args->limit)) {
if (parse_range_u32(value, &args->limit_min,
&args->limit_max)) {
error("Invalid limit argument: %s",
value);
return 1;
}
args->flags &= ~BTRFS_BALANCE_ARGS_LIMIT;
args->flags |= BTRFS_BALANCE_ARGS_LIMIT_RANGE;
} else {
args->flags &= ~BTRFS_BALANCE_ARGS_LIMIT_RANGE;
args->flags |= BTRFS_BALANCE_ARGS_LIMIT;
}
} else if (!strcmp(this_char, "stripes")) {
if (!value || !*value) {
error("the stripes filter requires an argument");
return 1;
}
if (parse_range_u32(value, &args->stripes_min,
&args->stripes_max)) {
error("invalid stripes argument");
return 1;
}
args->flags |= BTRFS_BALANCE_ARGS_STRIPES_RANGE;
} else {
error("unrecognized balance option: %s", this_char);
return 1;
}
}
return 0;
}
static void dump_balance_args(struct btrfs_balance_args *args)
{
if (args->flags & BTRFS_BALANCE_ARGS_CONVERT) {
printf("converting, target=%llu, soft is %s",
args->target,
(args->flags & BTRFS_BALANCE_ARGS_SOFT) ? "on" : "off");
} else {
printf("balancing");
}
if (args->flags & BTRFS_BALANCE_ARGS_PROFILES)
printf(", profiles=%llu", args->profiles);
if (args->flags & BTRFS_BALANCE_ARGS_USAGE)
printf(", usage=%llu", args->usage);
if (args->flags & BTRFS_BALANCE_ARGS_USAGE_RANGE) {
printf(", usage=");
print_range_u32(args->usage_min, args->usage_max);
}
if (args->flags & BTRFS_BALANCE_ARGS_DEVID)
printf(", devid=%llu", args->devid);
if (args->flags & BTRFS_BALANCE_ARGS_DRANGE)
printf(", drange=%llu..%llu", args->pstart, args->pend);
if (args->flags & BTRFS_BALANCE_ARGS_VRANGE)
printf(", vrange=%llu..%llu", args->vstart, args->vend);
if (args->flags & BTRFS_BALANCE_ARGS_LIMIT)
printf(", limit=%llu", args->limit);
if (args->flags & BTRFS_BALANCE_ARGS_LIMIT_RANGE) {
printf(", limit=");
print_range_u32(args->limit_min, args->limit_max);
}
if (args->flags & BTRFS_BALANCE_ARGS_STRIPES_RANGE) {
printf(", stripes=");
print_range_u32(args->stripes_min, args->stripes_max);
}
printf("\n");
}
static void dump_ioctl_balance_args(struct btrfs_ioctl_balance_args *args)
{
printf("Dumping filters: flags 0x%llx, state 0x%llx, force is %s\n",
args->flags, args->state,
(args->flags & BTRFS_BALANCE_FORCE) ? "on" : "off");
if (args->flags & BTRFS_BALANCE_DATA) {
printf(" DATA (flags 0x%llx): ", args->data.flags);
dump_balance_args(&args->data);
}
if (args->flags & BTRFS_BALANCE_METADATA) {
printf(" METADATA (flags 0x%llx): ", args->meta.flags);
dump_balance_args(&args->meta);
}
if (args->flags & BTRFS_BALANCE_SYSTEM) {
printf(" SYSTEM (flags 0x%llx): ", args->sys.flags);
dump_balance_args(&args->sys);
}
}
static int do_balance_v1(int fd)
{
struct btrfs_ioctl_vol_args args;
int ret;
memset(&args, 0, sizeof(args));
ret = ioctl(fd, BTRFS_IOC_BALANCE, &args);
return ret;
}
enum {
BALANCE_START_FILTERS = 1 << 0,
BALANCE_START_NOWARN = 1 << 1
};
static int do_balance(const char *path, struct btrfs_ioctl_balance_args *args,
unsigned flags, bool enqueue)
{
int fd;
int ret;
DIR *dirstream = NULL;
fd = btrfs_open_dir(path, &dirstream, 1);
if (fd < 0)
return 1;
ret = check_running_fs_exclop(fd, BTRFS_EXCLOP_BALANCE, enqueue);
if (ret != 0) {
if (ret < 0)
error("unable to check status of exclusive operation: %m");
close_file_or_dir(fd, dirstream);
return 1;
}
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)
pr_stderr(LOG_DEFAULT, "balance paused by user\n");
if (args->state & BTRFS_BALANCE_STATE_CANCEL_REQ)
pr_stderr(LOG_DEFAULT, "balance canceled by user\n");
ret = 0;
} else {
error("error during balancing '%s': %m", path);
if (errno != EINPROGRESS)
pr_stderr(LOG_DEFAULT,
"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 {
pr_verbose(LOG_DEFAULT,
"Done, had to relocate %llu out of %llu chunks\n",
args->stat.completed, args->stat.considered);
}
out:
close_file_or_dir(fd, dirstream);
return ret;
}
static const char * const cmd_balance_start_usage[] = {
"btrfs balance start [options] <path>",
"Balance chunks across the devices",
"Balance and/or convert (change allocation profile of) chunks that",
"passed all filters in a comma-separated list of filters for a",
"particular chunk type. If filter list is not given balance all",
"chunks of that type. In case none of the -d, -m or -s options is",
"given balance all chunks in a filesystem. This is potentially",
"long operation and the user is warned before this start, with",
"a delay to stop it.",
"",
OPTLINE("-d[filters]", "act on data chunks with optional filters (no space in between)"),
OPTLINE("-m[filters]", "act on metadata chunks with optinal filters (no space in between)"),
OPTLINE("-s[filters]", "act on system chunks (only under -f) with optional filters (no space in between)"),
OPTLINE("-f", "force a reduction of metadata integrity, or skip timeout when converting to RAID56 profiles"),
OPTLINE("--full-balance", "do not print warning and do not delay start"),
OPTLINE("--background|--bg", "run the balance as a background process"),
OPTLINE("--enqueue", "wait if there's another exclusive operation running, otherwise continue"),
OPTLINE("-v|--verbose", "deprecated, alias for global -v option"),
HELPINFO_INSERT_GLOBALS,
HELPINFO_INSERT_VERBOSE,
HELPINFO_INSERT_QUIET,
NULL
};
static int cmd_balance_start(const struct cmd_struct *cmd,
int argc, char **argv)
{
struct btrfs_ioctl_balance_args args;
struct btrfs_balance_args *ptrs[] = { &args.data, &args.sys,
&args.meta, NULL };
bool force = false;
bool background = false;
bool enqueue = false;
unsigned start_flags = 0;
bool raid56_warned = false;
int i;
memset(&args, 0, sizeof(args));
optind = 0;
while (1) {
enum { GETOPT_VAL_FULL_BALANCE = GETOPT_VAL_FIRST,
GETOPT_VAL_BACKGROUND, GETOPT_VAL_ENQUEUE };
static const struct option longopts[] = {
{ "data", optional_argument, NULL, 'd'},
{ "metadata", optional_argument, NULL, 'm' },
{ "system", optional_argument, NULL, 's' },
{ "force", no_argument, NULL, 'f' },
{ "verbose", no_argument, NULL, 'v' },
{ "full-balance", no_argument, NULL,
GETOPT_VAL_FULL_BALANCE },
{ "background", no_argument, NULL,
GETOPT_VAL_BACKGROUND },
{ "bg", no_argument, NULL, GETOPT_VAL_BACKGROUND },
{ "enqueue", no_argument, NULL, GETOPT_VAL_ENQUEUE},
{ NULL, 0, NULL, 0 }
};
int opt = getopt_long(argc, argv, "d::s::m::fv", longopts, NULL);
if (opt < 0)
break;
switch (opt) {
case 'd':
start_flags |= BALANCE_START_FILTERS;
args.flags |= BTRFS_BALANCE_DATA;
if (parse_filters(optarg, &args.data))
return 1;
break;
case 's':
start_flags |= BALANCE_START_FILTERS;
args.flags |= BTRFS_BALANCE_SYSTEM;
if (parse_filters(optarg, &args.sys))
return 1;
break;
case 'm':
start_flags |= BALANCE_START_FILTERS;
args.flags |= BTRFS_BALANCE_METADATA;
if (parse_filters(optarg, &args.meta))
return 1;
break;
case 'f':
force = true;
break;
case 'v':
bconf_be_verbose();
break;
case GETOPT_VAL_FULL_BALANCE:
start_flags |= BALANCE_START_NOWARN;
break;
case GETOPT_VAL_BACKGROUND:
background = true;
break;
case GETOPT_VAL_ENQUEUE:
enqueue = true;
break;
default:
usage_unknown_option(cmd, argv);
}
}
if (check_argc_exact(argc - optind, 1))
return 1;
/*
* allow -s only under --force, otherwise do with system chunks
* the same thing we were ordered to do with meta chunks
*/
if (args.flags & BTRFS_BALANCE_SYSTEM) {
if (!force) {
error(
"Refusing to explicitly operate on system chunks.\n"
"Pass --force if you really want to do that.");
return 1;
}
} else if (args.flags & BTRFS_BALANCE_METADATA) {
args.flags |= BTRFS_BALANCE_SYSTEM;
memcpy(&args.sys, &args.meta,
sizeof(struct btrfs_balance_args));
}
if (!(start_flags & BALANCE_START_FILTERS)) {
/* relocate everything - no filters */
args.flags |= BTRFS_BALANCE_TYPE_MASK;
}
/* drange makes sense only when devid is set */
for (i = 0; ptrs[i]; i++) {
if ((ptrs[i]->flags & BTRFS_BALANCE_ARGS_DRANGE) &&
!(ptrs[i]->flags & BTRFS_BALANCE_ARGS_DEVID)) {
error("drange filter must be used with devid filter");
return 1;
}
}
/* soft makes sense only when convert for corresponding type is set */
for (i = 0; ptrs[i]; i++) {
int delay = 10;
if ((ptrs[i]->flags & BTRFS_BALANCE_ARGS_SOFT) &&
!(ptrs[i]->flags & BTRFS_BALANCE_ARGS_CONVERT)) {
error("'soft' option can be used only when converting profiles");
return 1;
}
if (!(ptrs[i]->flags & BTRFS_BALANCE_ARGS_CONVERT))
continue;
if (!(ptrs[i]->target & BTRFS_BLOCK_GROUP_RAID56_MASK))
continue;
if (raid56_warned)
continue;
raid56_warned = true;
printf("WARNING:\n\n");
printf("\tRAID5/6 support has known problems and is strongly discouraged\n");
printf("\tto be used besides testing or evaluation. It is recommended that\n");
printf("\tyou use one of the other RAID profiles.\n");
/*
* Override timeout by the --force option too, though it's
* otherwise used for allowing redundancy reduction.
*/
if (force) {
printf("\tSafety timeout skipped due to --force\n\n");
continue;
}
printf("\tThe operation will continue in %d seconds.\n", delay);
printf("\tUse Ctrl-C to stop.\n");
while (delay) {
printf("%2d", delay--);
fflush(stdout);
sleep(1);
}
printf("\nStarting conversion to RAID5/6.\n");
}
if (!(start_flags & BALANCE_START_FILTERS) && !(start_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");
}
if (force)
args.flags |= BTRFS_BALANCE_FORCE;
if (bconf.verbose > BTRFS_BCONF_QUIET)
dump_ioctl_balance_args(&args);
if (background) {
switch (fork()) {
case (-1):
error("unable to fork to run balance in background");
return 1;
case (0):
setsid();
switch(fork()) {
case (-1):
error(
"unable to fork to run balance in background");
exit(1);
case (0):
/*
* Read the return value to silence compiler
* warning. Change to / should succeed and
* we're not in a security-sensitive context.
*/
i = chdir("/");
close(0);
close(1);
close(2);
open("/dev/null", O_RDONLY);
open("/dev/null", O_WRONLY);
open("/dev/null", O_WRONLY);
break;
default:
exit(0);
}
break;
default:
exit(0);
}
}
return do_balance(argv[optind], &args, start_flags, enqueue);
}
static DEFINE_SIMPLE_COMMAND(balance_start, "start");
static const char * const cmd_balance_pause_usage[] = {
"btrfs balance pause <path>",
"Pause running balance",
NULL
};
static int cmd_balance_pause(const struct cmd_struct *cmd,
int argc, char **argv)
{
const char *path;
int fd;
int ret;
DIR *dirstream = NULL;
clean_args_no_options(cmd, argc, argv);
if (check_argc_exact(argc - optind, 1))
return 1;
path = argv[optind];
fd = btrfs_open_dir(path, &dirstream, 1);
if (fd < 0)
return 1;
ret = ioctl(fd, BTRFS_IOC_BALANCE_CTL, BTRFS_BALANCE_CTL_PAUSE);
if (ret < 0) {
error("balance pause on '%s' failed: %s", path,
(errno == ENOTCONN) ? "Not running" : strerror(errno));
if (errno == ENOTCONN)
ret = 2;
else
ret = 1;
}
btrfs_warn_multiple_profiles(fd);
close_file_or_dir(fd, dirstream);
return ret;
}
static DEFINE_SIMPLE_COMMAND(balance_pause, "pause");
static const char * const cmd_balance_cancel_usage[] = {
"btrfs balance cancel <path>",
"Cancel running or paused balance",
NULL
};
static int cmd_balance_cancel(const struct cmd_struct *cmd,
int argc, char **argv)
{
const char *path;
int fd;
int ret;
DIR *dirstream = NULL;
clean_args_no_options(cmd, argc, argv);
if (check_argc_exact(argc - optind, 1))
return 1;
path = argv[optind];
fd = btrfs_open_dir(path, &dirstream, 1);
if (fd < 0)
return 1;
ret = ioctl(fd, BTRFS_IOC_BALANCE_CTL, BTRFS_BALANCE_CTL_CANCEL);
if (ret < 0) {
error("balance cancel on '%s' failed: %s", path,
(errno == ENOTCONN) ? "Not in progress" : strerror(errno));
if (errno == ENOTCONN)
ret = 2;
else
ret = 1;
}
btrfs_warn_multiple_profiles(fd);
close_file_or_dir(fd, dirstream);
return ret;
}
static DEFINE_SIMPLE_COMMAND(balance_cancel, "cancel");
static const char * const cmd_balance_resume_usage[] = {
"btrfs balance resume <path>",
"Resume interrupted balance",
HELPINFO_INSERT_GLOBALS,
HELPINFO_INSERT_QUIET,
NULL
};
static int cmd_balance_resume(const struct cmd_struct *cmd,
int argc, char **argv)
{
struct btrfs_ioctl_balance_args args;
const char *path;
DIR *dirstream = NULL;
int fd;
int ret;
clean_args_no_options(cmd, argc, argv);
if (check_argc_exact(argc - optind, 1))
return 1;
path = argv[optind];
fd = btrfs_open_dir(path, &dirstream, 1);
if (fd < 0)
return 1;
memset(&args, 0, sizeof(args));
args.flags |= BTRFS_BALANCE_RESUME;
ret = ioctl(fd, BTRFS_IOC_BALANCE_V2, &args);
if (ret < 0) {
if (errno == ECANCELED) {
if (args.state & BTRFS_BALANCE_STATE_PAUSE_REQ)
pr_stderr(LOG_DEFAULT, "balance paused by user\n");
if (args.state & BTRFS_BALANCE_STATE_CANCEL_REQ)
pr_stderr(LOG_DEFAULT, "balance canceled by user\n");
} else if (errno == ENOTCONN || errno == EINPROGRESS) {
error("balance resume on '%s' failed: %s", path,
(errno == ENOTCONN) ? "Not in progress" :
"Already running");
if (errno == ENOTCONN)
ret = 2;
else
ret = 1;
} else {
error("error during balancing '%s': %m\n"
"There may be more info in syslog - try dmesg | tail",
path);
ret = 1;
}
} else {
pr_verbose(LOG_DEFAULT,
"Done, had to relocate %llu out of %llu chunks\n",
args.stat.completed, args.stat.considered);
}
close_file_or_dir(fd, dirstream);
return ret;
}
static DEFINE_SIMPLE_COMMAND(balance_resume, "resume");
static const char * const cmd_balance_status_usage[] = {
"btrfs balance status [-v] <path>",
"Show status of running or paused balance",
"",
OPTLINE("-v|--verbose", "deprecated, alias for global -v option"),
HELPINFO_INSERT_GLOBALS,
HELPINFO_INSERT_VERBOSE,
NULL
};
/* Checks the status of the balance if any
* return codes:
* 2 : Error failed to know if there is any pending balance
* 1 : Successful to know status of a pending balance
* 0 : When there is no pending balance or completed
*/
static int cmd_balance_status(const struct cmd_struct *cmd,
int argc, char **argv)
{
struct btrfs_ioctl_balance_args args;
const char *path;
DIR *dirstream = NULL;
int fd;
int ret;
optind = 0;
while (1) {
int opt;
static const struct option longopts[] = {
{ "verbose", no_argument, NULL, 'v' },
{ NULL, 0, NULL, 0 }
};
opt = getopt_long(argc, argv, "v", longopts, NULL);
if (opt < 0)
break;
switch (opt) {
case 'v':
bconf_be_verbose();
break;
default:
usage_unknown_option(cmd, argv);
}
}
if (check_argc_exact(argc - optind, 1))
return 1;
path = argv[optind];
fd = btrfs_open_dir(path, &dirstream, 1);
if (fd < 0)
return 2;
ret = ioctl(fd, BTRFS_IOC_BALANCE_PROGRESS, &args);
if (ret < 0) {
if (errno == ENOTCONN) {
printf("No balance found on '%s'\n", path);
ret = 0;
goto out;
}
error("balance status on '%s' failed: %m", path);
ret = 2;
goto out;
}
if (args.state & BTRFS_BALANCE_STATE_RUNNING) {
printf("Balance on '%s' is running", path);
if (args.state & BTRFS_BALANCE_STATE_CANCEL_REQ)
printf(", cancel requested\n");
else if (args.state & BTRFS_BALANCE_STATE_PAUSE_REQ)
printf(", pause requested\n");
else
printf("\n");
} else {
printf("Balance on '%s' is paused\n", path);
}
printf("%llu out of about %llu chunks balanced (%llu considered), "
"%3.f%% left\n", args.stat.completed,
args.stat.expected, args.stat.considered,
100 * (1 - (float)args.stat.completed/args.stat.expected));
if (bconf.verbose > BTRFS_BCONF_QUIET)
dump_ioctl_balance_args(&args);
ret = 1;
out:
close_file_or_dir(fd, dirstream);
return ret;
}
static DEFINE_SIMPLE_COMMAND(balance_status, "status");
static int cmd_balance_full(const struct cmd_struct *cmd, int argc, char **argv)
{
struct btrfs_ioctl_balance_args args;
memset(&args, 0, sizeof(args));
args.flags |= BTRFS_BALANCE_TYPE_MASK;
/* No enqueueing supported for the obsolete syntax */
return do_balance(argv[1], &args, BALANCE_START_NOWARN, false);
}
static DEFINE_COMMAND(balance_full, "--full-balance", cmd_balance_full,
NULL, NULL, CMD_HIDDEN);
static const char balance_cmd_group_info[] =
"balance data across devices, or change block groups using filters";
static const struct cmd_group balance_cmd_group = {
balance_cmd_group_usage, balance_cmd_group_info, {
&cmd_struct_balance_start,
&cmd_struct_balance_pause,
&cmd_struct_balance_cancel,
&cmd_struct_balance_resume,
&cmd_struct_balance_status,
&cmd_struct_balance_full,
NULL
}
};
static int cmd_balance(const struct cmd_struct *cmd, int argc, char **argv)
{
bool old_syntax = true;
/*
* Exclude all valid subcommands from being potentially confused as path
* for the obsolete syntax: btrfs balance <path>
*/
if (argc == 2) {
for (int i = 0; balance_cmd_group.commands[i] != NULL; i++) {
if (strcmp(argv[1], balance_cmd_group.commands[i]->token) == 0) {
old_syntax = false;
break;
}
}
} else {
old_syntax = false;
}
if (old_syntax) {
struct btrfs_ioctl_balance_args args;
warning("deprecated syntax, please use 'btrfs balance start'");
memset(&args, 0, sizeof(args));
args.flags |= BTRFS_BALANCE_TYPE_MASK;
/* No enqueueing supported for the obsolete syntax */
return do_balance(argv[1], &args, 0, false);
}
return handle_command_group(cmd, argc, argv);
}
DEFINE_COMMAND(balance, "balance", cmd_balance, NULL, &balance_cmd_group, 0);
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