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-rw-r--r--cmds-balance.c857
1 files changed, 857 insertions, 0 deletions
diff --git a/cmds-balance.c b/cmds-balance.c
new file mode 100644
index 00000000..e0d10aae
--- /dev/null
+++ b/cmds-balance.c
@@ -0,0 +1,857 @@
+/*
+ * 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 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 {
+ 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 checkso
+ */
+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;
+}
+
+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 = btrfs_open_dir(path, &dirstream, 1);
+ if (fd < 0)
+ 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 {
+ error("error during balancing '%s': %s", 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) {
+ 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 (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)) {
+ 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 (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 = btrfs_open_dir(path, &dirstream, 1);
+ if (fd < 0)
+ return 1;
+
+ ret = ioctl(fd, BTRFS_IOC_BALANCE_CTL, BTRFS_BALANCE_CTL_PAUSE);
+ e = errno;
+ close_file_or_dir(fd, dirstream);
+
+ if (ret < 0) {
+ error("balance pause on '%s' failed: %s", 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 = btrfs_open_dir(path, &dirstream, 1);
+ if (fd < 0)
+ return 1;
+
+ ret = ioctl(fd, BTRFS_IOC_BALANCE_CTL, BTRFS_BALANCE_CTL_CANCEL);
+ e = errno;
+ close_file_or_dir(fd, dirstream);
+
+ if (ret < 0) {
+ error("balance cancel on '%s' failed: %s", 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 = 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);
+ 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) {
+ error("balance resume on '%s' failed: %s", path,
+ (e == ENOTCONN) ? "Not in progress" :
+ "Already running");
+ if (e == ENOTCONN)
+ return 2;
+ else
+ return 1;
+ } else {
+ error("error during balancing '%s': %s\n"
+ "There may be more info in syslog - try dmesg | tail",
+ 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 = btrfs_open_dir(path, &dirstream, 1);
+ if (fd < 0)
+ 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;
+ }
+ error("balance status on '%s' failed: %s", 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;
+}
+
+static const char balance_cmd_group_info[] =
+"balance data accross devices, or change block groups using filters";
+
+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);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-24 18:49:00 +0000