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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 <errno.h>
#include "kerncompat.h"
#include "ctree.h"
#include "ioctl.h"
#include "volumes.h"
#include "commands.h"
#include "utils.h"
static const char * const balance_cmd_group_usage[] = {
"btrfs balance <command> [options] <path>",
"btrfs balance <path>",
NULL
};
static const char balance_cmd_group_info[] =
"'btrfs filesystem balance' command is deprecated, please use\n"
"'btrfs balance start' command instead.";
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, "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 {
fprintf(stderr, "Unknown profile '%s'\n", 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;
}
static int parse_range(const char *range, u64 *start, u64 *end)
{
char *dots;
dots = strstr(range, "..");
if (dots) {
const char *rest = dots + 2;
int skipped = 0;
*dots = 0;
if (!*rest) {
*end = (u64)-1;
skipped++;
} else {
if (parse_u64(rest, end))
return 1;
}
if (dots == range) {
*start = 0;
skipped++;
} else {
if (parse_u64(range, start))
return 1;
}
if (*start >= *end) {
fprintf(stderr, "Range %llu..%llu doesn't make "
"sense\n", (unsigned long long)*start,
(unsigned long long)*end);
return 1;
}
if (skipped <= 1)
return 0;
}
return 1;
}
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) {
fprintf(stderr, "the profiles filter requires "
"an argument\n");
return 1;
}
if (parse_profiles(value, &args->profiles)) {
fprintf(stderr, "Invalid profiles argument\n");
return 1;
}
args->flags |= BTRFS_BALANCE_ARGS_PROFILES;
} else if (!strcmp(this_char, "usage")) {
if (!value || !*value) {
fprintf(stderr, "the usage filter requires "
"an argument\n");
return 1;
}
if (parse_u64(value, &args->usage) ||
args->usage > 100) {
fprintf(stderr, "Invalid usage argument: %s\n",
value);
return 1;
}
args->flags |= BTRFS_BALANCE_ARGS_USAGE;
} else if (!strcmp(this_char, "devid")) {
if (!value || !*value) {
fprintf(stderr, "the devid filter requires "
"an argument\n");
return 1;
}
if (parse_u64(value, &args->devid) ||
args->devid == 0) {
fprintf(stderr, "Invalid devid argument: %s\n",
value);
return 1;
}
args->flags |= BTRFS_BALANCE_ARGS_DEVID;
} else if (!strcmp(this_char, "drange")) {
if (!value || !*value) {
fprintf(stderr, "the drange filter requires "
"an argument\n");
return 1;
}
if (parse_range(value, &args->pstart, &args->pend)) {
fprintf(stderr, "Invalid drange argument\n");
return 1;
}
args->flags |= BTRFS_BALANCE_ARGS_DRANGE;
} else if (!strcmp(this_char, "vrange")) {
if (!value || !*value) {
fprintf(stderr, "the vrange filter requires "
"an argument\n");
return 1;
}
if (parse_range(value, &args->vstart, &args->vend)) {
fprintf(stderr, "Invalid vrange argument\n");
return 1;
}
args->flags |= BTRFS_BALANCE_ARGS_VRANGE;
} else if (!strcmp(this_char, "convert")) {
if (!value || !*value) {
fprintf(stderr, "the convert option requires "
"an argument\n");
return 1;
}
if (parse_one_profile(value, &args->target)) {
fprintf(stderr, "Invalid convert argument\n");
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) {
fprintf(stderr,
"the limit filter requires an argument\n");
return 1;
}
if (parse_u64(value, &args->limit)) {
fprintf(stderr, "Invalid limit argument: %s\n",
value);
return 1;
}
args->flags |= BTRFS_BALANCE_ARGS_LIMIT;
} else {
fprintf(stderr, "Unrecognized balance option '%s'\n",
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_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);
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;
}
static int do_balance(const char *path, struct btrfs_ioctl_balance_args *args,
int nofilters)
{
int fd;
int ret;
int e;
DIR *dirstream = NULL;
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
return 1;
}
ret = ioctl(fd, BTRFS_IOC_BALANCE_V2, args);
e = errno;
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 (e == ENOTTY && nofilters) {
ret = do_balance_v1(fd);
if (ret == 0)
goto out;
e = errno;
}
if (e == 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 {
fprintf(stderr, "ERROR: error during balancing '%s' "
"- %s\n", path, strerror(e));
if (e != EINPROGRESS)
fprintf(stderr, "There may be more info in "
"syslog - try dmesg | tail\n");
ret = 1;
}
} else {
printf("Done, had to relocate %llu out of %llu chunks\n",
(unsigned long long)args->stat.completed,
(unsigned long long)args->stat.considered);
ret = 0;
}
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.",
"",
"-d[filters] act on data chunks",
"-m[filters] act on metadata chunks",
"-s[filters] act on system chunks (only under -f)",
"-v be verbose",
"-f force reducing of metadata integrity",
NULL
};
static int cmd_balance_start(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 verbose = 0;
int nofilters = 1;
int i;
memset(&args, 0, sizeof(args));
optind = 1;
while (1) {
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' },
{ NULL, 0, NULL, 0 }
};
int opt = getopt_long(argc, argv, "d::s::m::fv", longopts, NULL);
if (opt < 0)
break;
switch (opt) {
case 'd':
nofilters = 0;
args.flags |= BTRFS_BALANCE_DATA;
if (parse_filters(optarg, &args.data))
return 1;
break;
case 's':
nofilters = 0;
args.flags |= BTRFS_BALANCE_SYSTEM;
if (parse_filters(optarg, &args.sys))
return 1;
break;
case 'm':
nofilters = 0;
args.flags |= BTRFS_BALANCE_METADATA;
if (parse_filters(optarg, &args.meta))
return 1;
break;
case 'f':
force = 1;
break;
case 'v':
verbose = 1;
break;
default:
usage(cmd_balance_start_usage);
}
}
if (check_argc_exact(argc - optind, 1))
usage(cmd_balance_start_usage);
/*
* 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) {
fprintf(stderr,
"Refusing to explicitly operate on system chunks.\n"
"Pass --force if you really want to do that.\n");
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 (nofilters) {
/* 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)) {
fprintf(stderr, "drange filter can be used only if "
"devid filter is used\n");
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)) {
fprintf(stderr, "'soft' option can be used only if "
"changing profiles\n");
return 1;
}
}
if (force)
args.flags |= BTRFS_BALANCE_FORCE;
if (verbose)
dump_ioctl_balance_args(&args);
return do_balance(argv[optind], &args, nofilters);
}
static const char * const cmd_balance_pause_usage[] = {
"btrfs balance pause <path>",
"Pause running balance",
NULL
};
static int cmd_balance_pause(int argc, char **argv)
{
const char *path;
int fd;
int ret;
int e;
DIR *dirstream = NULL;
if (check_argc_exact(argc, 2))
usage(cmd_balance_pause_usage);
path = argv[1];
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
return 1;
}
ret = ioctl(fd, BTRFS_IOC_BALANCE_CTL, BTRFS_BALANCE_CTL_PAUSE);
e = errno;
close_file_or_dir(fd, dirstream);
if (ret < 0) {
fprintf(stderr, "ERROR: balance pause on '%s' failed - %s\n",
path, (e == ENOTCONN) ? "Not running" : strerror(e));
if (e == ENOTCONN)
return 2;
else
return 1;
}
return 0;
}
static const char * const cmd_balance_cancel_usage[] = {
"btrfs balance cancel <path>",
"Cancel running or paused balance",
NULL
};
static int cmd_balance_cancel(int argc, char **argv)
{
const char *path;
int fd;
int ret;
int e;
DIR *dirstream = NULL;
if (check_argc_exact(argc, 2))
usage(cmd_balance_cancel_usage);
path = argv[1];
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
return 1;
}
ret = ioctl(fd, BTRFS_IOC_BALANCE_CTL, BTRFS_BALANCE_CTL_CANCEL);
e = errno;
close_file_or_dir(fd, dirstream);
if (ret < 0) {
fprintf(stderr, "ERROR: balance cancel on '%s' failed - %s\n",
path, (e == ENOTCONN) ? "Not in progress" : strerror(e));
if (e == ENOTCONN)
return 2;
else
return 1;
}
return 0;
}
static const char * const cmd_balance_resume_usage[] = {
"btrfs balance resume <path>",
"Resume interrupted balance",
NULL
};
static int cmd_balance_resume(int argc, char **argv)
{
struct btrfs_ioctl_balance_args args;
const char *path;
DIR *dirstream = NULL;
int fd;
int ret;
int e;
if (check_argc_exact(argc, 2))
usage(cmd_balance_resume_usage);
path = argv[1];
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
return 1;
}
memset(&args, 0, sizeof(args));
args.flags |= BTRFS_BALANCE_RESUME;
ret = ioctl(fd, BTRFS_IOC_BALANCE_V2, &args);
e = errno;
close_file_or_dir(fd, dirstream);
if (ret < 0) {
if (e == 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 (e == ENOTCONN || e == EINPROGRESS) {
fprintf(stderr, "ERROR: balance resume on '%s' "
"failed - %s\n", path,
(e == ENOTCONN) ? "Not in progress" :
"Already running");
if (e == ENOTCONN)
return 2;
else
return 1;
} else {
fprintf(stderr,
"ERROR: error during balancing '%s' - %s\n"
"There may be more info in syslog - try dmesg | tail\n", path, strerror(e));
return 1;
}
} else {
printf("Done, had to relocate %llu out of %llu chunks\n",
(unsigned long long)args.stat.completed,
(unsigned long long)args.stat.considered);
}
return 0;
}
static const char * const cmd_balance_status_usage[] = {
"btrfs balance status [-v] <path>",
"Show status of running or paused balance",
"",
"-v be 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(int argc, char **argv)
{
struct btrfs_ioctl_balance_args args;
const char *path;
DIR *dirstream = NULL;
int fd;
int verbose = 0;
int ret;
int e;
optind = 1;
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':
verbose = 1;
break;
default:
usage(cmd_balance_status_usage);
}
}
if (check_argc_exact(argc - optind, 1))
usage(cmd_balance_status_usage);
path = argv[optind];
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
return 2;
}
ret = ioctl(fd, BTRFS_IOC_BALANCE_PROGRESS, &args);
e = errno;
close_file_or_dir(fd, dirstream);
if (ret < 0) {
if (e == ENOTCONN) {
printf("No balance found on '%s'\n", path);
return 0;
}
fprintf(stderr, "ERROR: balance status on '%s' failed - %s\n",
path, strerror(e));
return 2;
}
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 (verbose)
dump_ioctl_balance_args(&args);
return 1;
}
const struct cmd_group balance_cmd_group = {
balance_cmd_group_usage, balance_cmd_group_info, {
{ "start", cmd_balance_start, cmd_balance_start_usage, NULL, 0 },
{ "pause", cmd_balance_pause, cmd_balance_pause_usage, NULL, 0 },
{ "cancel", cmd_balance_cancel, cmd_balance_cancel_usage, NULL, 0 },
{ "resume", cmd_balance_resume, cmd_balance_resume_usage, NULL, 0 },
{ "status", cmd_balance_status, cmd_balance_status_usage, NULL, 0 },
NULL_CMD_STRUCT
}
};
int cmd_balance(int argc, char **argv)
{
if (argc == 2) {
/* 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, 1);
}
return handle_command_group(&balance_cmd_group, argc, argv);
}
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