#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 "commands.h"
#include "utils.h"
+#include "help.h"
static const char * const balance_cmd_group_usage[] = {
"btrfs balance <command> [options] <path>",
}
/*
- * Convert 64bit range to 32bit with boundary checkso
+ * Convert 64bit range to 32bit with boundary checks
*/
static int range_to_u32(u64 start, u64 end, u32 *start32, u32 *end32)
{
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,
- int nofilters)
+ unsigned flags)
{
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 (!(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 (e == ENOTTY && nofilters) {
+ if (errno == ENOTTY && !(flags & BALANCE_START_FILTERS)) {
ret = do_balance_v1(fd);
if (ret == 0)
goto out;
- e = errno;
}
- if (e == ECANCELED) {
+ 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': %s", path, strerror(e));
- if (e != EINPROGRESS)
+ 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;
"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.",
+ "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)",
"-v be verbose",
"-f force reducing of metadata integrity",
+ "--full-balance do not print warning and do not delay start",
+ "--background|--bg",
+ " run the balance as a background process",
NULL
};
&args.meta, NULL };
int force = 0;
int verbose = 0;
- int nofilters = 1;
+ int background = 0;
+ unsigned start_flags = 0;
int i;
memset(&args, 0, sizeof(args));
- optind = 1;
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 }
};
switch (opt) {
case 'd':
- nofilters = 0;
+ start_flags |= BALANCE_START_FILTERS;
args.flags |= BTRFS_BALANCE_DATA;
if (parse_filters(optarg, &args.data))
return 1;
break;
case 's':
- nofilters = 0;
+ start_flags |= BALANCE_START_FILTERS;
args.flags |= BTRFS_BALANCE_SYSTEM;
if (parse_filters(optarg, &args.sys))
return 1;
break;
case 'm':
- nofilters = 0;
+ start_flags |= BALANCE_START_FILTERS;
args.flags |= BTRFS_BALANCE_METADATA;
if (parse_filters(optarg, &args.meta))
case 'v':
verbose = 1;
break;
+ case GETOPT_VAL_FULL_BALANCE:
+ start_flags |= BALANCE_START_NOWARN;
+ break;
+ case GETOPT_VAL_BACKGROUND:
+ background = 1;
+ break;
default:
usage(cmd_balance_start_usage);
}
sizeof(struct btrfs_balance_args));
}
- if (nofilters) {
+ if (!(start_flags & BALANCE_START_FILTERS)) {
/* relocate everything - no filters */
args.flags |= BTRFS_BALANCE_TYPE_MASK;
}
args.flags |= BTRFS_BALANCE_FORCE;
if (verbose)
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, nofilters);
+ return do_balance(argv[optind], &args, start_flags);
}
static const char * const cmd_balance_pause_usage[] = {
const char *path;
int fd;
int ret;
- int e;
DIR *dirstream = NULL;
clean_args_no_options(argc, argv, cmd_balance_pause_usage);
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;
+ (errno == ENOTCONN) ? "Not running" : strerror(errno));
+ if (errno == ENOTCONN)
+ ret = 2;
else
- return 1;
+ ret = 1;
}
- return 0;
+ close_file_or_dir(fd, dirstream);
+ return ret;
}
static const char * const cmd_balance_cancel_usage[] = {
const char *path;
int fd;
int ret;
- int e;
DIR *dirstream = NULL;
clean_args_no_options(argc, argv, cmd_balance_cancel_usage);
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;
+ (errno == ENOTCONN) ? "Not in progress" : strerror(errno));
+ if (errno == ENOTCONN)
+ ret = 2;
else
- return 1;
+ ret = 1;
}
- return 0;
+ close_file_or_dir(fd, dirstream);
+ return ret;
}
static const char * const cmd_balance_resume_usage[] = {
DIR *dirstream = NULL;
int fd;
int ret;
- int e;
clean_args_no_options(argc, argv, cmd_balance_resume_usage);
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 (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 (e == ENOTCONN || e == EINPROGRESS) {
+ } else if (errno == ENOTCONN || errno == EINPROGRESS) {
error("balance resume on '%s' failed: %s", path,
- (e == ENOTCONN) ? "Not in progress" :
+ (errno == ENOTCONN) ? "Not in progress" :
"Already running");
- if (e == ENOTCONN)
- return 2;
+ if (errno == ENOTCONN)
+ ret = 2;
else
- return 1;
+ ret = 1;
} else {
- error("error during balancing '%s': %s\n"
+ error("error during balancing '%s': %m\n"
"There may be more info in syslog - try dmesg | tail",
- path, strerror(e));
- return 1;
+ path);
+ ret = 1;
}
} else {
printf("Done, had to relocate %llu out of %llu chunks\n",
(unsigned long long)args.stat.considered);
}
- return 0;
+ close_file_or_dir(fd, dirstream);
+ return ret;
}
static const char * const cmd_balance_status_usage[] = {
int fd;
int verbose = 0;
int ret;
- int e;
- optind = 1;
while (1) {
int opt;
static const struct option longopts[] = {
return 2;
ret = ioctl(fd, BTRFS_IOC_BALANCE_PROGRESS, &args);
- e = errno;
- close_file_or_dir(fd, dirstream);
-
if (ret < 0) {
- if (e == ENOTCONN) {
+ if (errno == ENOTCONN) {
printf("No balance found on '%s'\n", path);
- return 0;
+ ret = 0;
+ goto out;
}
- error("balance status on '%s' failed: %s", path, strerror(e));
- return 2;
+ error("balance status on '%s' failed: %m", path);
+ ret = 2;
+ goto out;
}
if (args.state & BTRFS_BALANCE_STATE_RUNNING) {
if (verbose)
dump_ioctl_balance_args(&args);
- return 1;
+ ret = 1;
+out:
+ close_file_or_dir(fd, dirstream);
+ return ret;
+}
+
+static int cmd_balance_full(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 const char balance_cmd_group_info[] =
-"balance data accross devices, or change block groups using filters";
+"balance data across devices, or change block groups using filters";
const struct cmd_group balance_cmd_group = {
balance_cmd_group_usage, balance_cmd_group_info, {
{ "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 },
+ { "--full-balance", cmd_balance_full, NULL, NULL, 1 },
NULL_CMD_STRUCT
}
};
int cmd_balance(int argc, char **argv)
{
- if (argc == 2) {
+ 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, 1);
+ return do_balance(argv[1], &args, 0);
}
return handle_command_group(&balance_cmd_group, argc, argv);
projects / platform / upstream / btrfs-progs.git / blobdiff