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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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include "kerncompat.h"
#include "ctree.h"
#include "ioctl.h"
#include "volumes.h"
#include "cmds/commands.h"
#include "common/utils.h"
#include "common/help.h"
static const char * const balance_cmd_group_usage[] = {
"btrfs balance <command> [options] <path>",
"btrfs balance <path>",
NULL
};
static int parse_one_profile(const char *profile, u64 *flags)
{
if (!strcmp(profile, "raid0")) {
*flags |= BTRFS_BLOCK_GROUP_RAID0;
} else if (!strcmp(profile, "raid1")) {
*flags |= BTRFS_BLOCK_GROUP_RAID1;
} else if (!strcmp(profile, "raid1c3")) {
*flags |= BTRFS_BLOCK_GROUP_RAID1C3;
} else if (!strcmp(profile, "raid1c4")) {
*flags |= BTRFS_BLOCK_GROUP_RAID1C4;
} else if (!strcmp(profile, "raid10")) {
*flags |= BTRFS_BLOCK_GROUP_RAID10;
} else if (!strcmp(profile, "raid5")) {
*flags |= BTRFS_BLOCK_GROUP_RAID5;
} else if (!strcmp(profile, "raid6")) {
*flags |= BTRFS_BLOCK_GROUP_RAID6;
} else if (!strcmp(profile, "dup")) {
*flags |= BTRFS_BLOCK_GROUP_DUP;
} else if (!strcmp(profile, "single")) {
*flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
} else {
error("unknown profile: %s", profile);
return 1;
}
return 0;
}
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;
}
static int parse_u64(const char *str, u64 *result)
{
char *endptr;
u64 val;
val = strtoull(str, &endptr, 10);
if (*endptr)
return 1;
*result = val;
return 0;
}
/*
* Parse range that's missing some part that can be implicit:
* a..b - exact range, a can be equal to b
* a.. - implicitly unbounded maximum (end == (u64)-1)
* ..b - implicitly starting at 0
* a - invalid; unclear semantics, use parse_u64 instead
*
* Returned values are u64, value validation and interpretation should be done
* by the caller.
*/
static int parse_range(const char *range, u64 *start, u64 *end)
{
char *dots;
char *endptr;
const char *rest;
int skipped = 0;
dots = strstr(range, "..");
if (!dots)
return 1;
rest = dots + 2;
if (!*rest) {
*end = (u64)-1;
skipped++;
} else {
*end = strtoull(rest, &endptr, 10);
if (*endptr)
return 1;
}
if (dots == range) {
*start = 0;
skipped++;
} else {
*start = strtoull(range, &endptr, 10);
if (*endptr != 0 && *endptr != '.')
return 1;
}
if (*start > *end) {
error("range %llu..%llu doesn't make sense",
(unsigned long long)*start,
(unsigned long long)*end);
return 1;
}
if (skipped <= 1)
return 0;
return 1;
}
/*
* Parse range and check if start < end
*/
static int parse_range_strict(const char *range, u64 *start, u64 *end)
{
if (parse_range(range, start, end) == 0) {
if (*start >= *end) {
error("range %llu..%llu not allowed",
(unsigned long long)*start,
(unsigned long long)*end);
return 1;
}
return 0;
}
return 1;
}
/*
* Convert 64bit range to 32bit with boundary checks
*/
static int range_to_u32(u64 start, u64 end, u32 *start32, u32 *end32)
{
if (start > (u32)-1)
return 1;
if (end != (u64)-1 && end > (u32)-1)
return 1;
*start32 = (u32)start;
*end32 = (u32)end;
return 0;
}
__attribute__ ((unused))
static int parse_range_u32(const char *range, u32 *start, u32 *end)
{
u64 tmp_start;
u64 tmp_end;
if (parse_range(range, &tmp_start, &tmp_end))
return 1;
if (range_to_u32(tmp_start, tmp_end, start, end))
return 1;
return 0;
}
__attribute__ ((unused))
static void print_range(u64 start, u64 end)
{
if (start)
printf("%llu", (unsigned long long)start);
printf("..");
if (end != (u64)-1)
printf("%llu", (unsigned long long)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",
(unsigned long long)args->target,
(args->flags & BTRFS_BALANCE_ARGS_SOFT) ? "on" : "off");
} else {
printf("balancing");
}
if (args->flags & BTRFS_BALANCE_ARGS_PROFILES)
printf(", profiles=%llu", (unsigned long long)args->profiles);
if (args->flags & BTRFS_BALANCE_ARGS_USAGE)
printf(", usage=%llu", (unsigned long long)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", (unsigned long long)args->devid);
if (args->flags & BTRFS_BALANCE_ARGS_DRANGE)
printf(", drange=%llu..%llu",
(unsigned long long)args->pstart,
(unsigned long long)args->pend);
if (args->flags & BTRFS_BALANCE_ARGS_VRANGE)
printf(", vrange=%llu..%llu",
(unsigned long long)args->vstart,
(unsigned long long)args->vend);
if (args->flags & BTRFS_BALANCE_ARGS_LIMIT)
printf(", limit=%llu", (unsigned long long)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",
(unsigned long long)args->flags, (unsigned long long)args->state,
(args->flags & BTRFS_BALANCE_FORCE) ? "on" : "off");
if (args->flags & BTRFS_BALANCE_DATA) {
printf(" DATA (flags 0x%llx): ",
(unsigned long long)args->data.flags);
dump_balance_args(&args->data);
}
if (args->flags & BTRFS_BALANCE_METADATA) {
printf(" METADATA (flags 0x%llx): ",
(unsigned long long)args->meta.flags);
dump_balance_args(&args->meta);
}
if (args->flags & BTRFS_BALANCE_SYSTEM) {
printf(" SYSTEM (flags 0x%llx): ",
(unsigned long long)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)
{
int fd;
int ret;
DIR *dirstream = NULL;
fd = btrfs_open_dir(path, &dirstream, 1);
if (fd < 0)
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)
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 {
pr_verbose(MUST_LOG,
"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;
}
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.",
"",
"-d[filters] act on data chunks",
"-m[filters] act on metadata chunks",
"-s[filters] act on system chunks (only under -f)",
"-f force a reduction of metadata integrity",
"--full-balance do not print warning and do not delay start",
"--background|--bg",
" run the balance as a background process",
"-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 };
int force = 0;
int background = 0;
unsigned start_flags = 0;
int i;
memset(&args, 0, sizeof(args));
optind = 0;
while (1) {
enum { GETOPT_VAL_FULL_BALANCE = 256,
GETOPT_VAL_BACKGROUND = 257 };
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 },
{ 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 = 1;
break;
case 'v':
bconf_be_verbose();
break;
case GETOPT_VAL_FULL_BALANCE:
start_flags |= BALANCE_START_NOWARN;
break;
case GETOPT_VAL_BACKGROUND:
background = 1;
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++) {
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 (!(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);
}
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)
fprintf(stderr, "balance paused by user\n");
if (args.state & BTRFS_BALANCE_STATE_CANCEL_REQ)
fprintf(stderr, "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(MUST_LOG,
"Done, had to relocate %llu out of %llu chunks\n",
(unsigned long long)args.stat.completed,
(unsigned long long)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",
"",
"-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", (unsigned long long)args.stat.completed,
(unsigned long long)args.stat.expected,
(unsigned long long)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;
return do_balance(argv[1], &args, BALANCE_START_NOWARN);
}
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)
{
if (argc == 2 && strcmp("start", argv[1]) != 0) {
/* old 'btrfs filesystem balance <path>' syntax */
struct btrfs_ioctl_balance_args args;
memset(&args, 0, sizeof(args));
args.flags |= BTRFS_BALANCE_TYPE_MASK;
return do_balance(argv[1], &args, 0);
}
return handle_command_group(cmd, argc, argv);
}
DEFINE_COMMAND(balance, "balance", cmd_balance, NULL, &balance_cmd_group, 0);
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