forked from Mirrors/btrfs-progs
Btrfs-progs: add command to get/reset device stats via ioctl
"btrfs device stats" is used to retrieve and print the device stats. "btrfs device stats -z" is used to atomically retrieve, reset and print the stats. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>master
parent
7a69dc4eec
commit
5b8826ddfd
117
cmds-device.c
117
cmds-device.c
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@ -284,12 +284,129 @@ static int cmd_ready_dev(int argc, char **argv)
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return ret;
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}
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static const char * const cmd_dev_stats_usage[] = {
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"btrfs device stats [-z] <path>|<device>",
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"Show current device IO stats. -z to reset stats afterwards.",
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NULL
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};
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static int cmd_dev_stats(int argc, char **argv)
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{
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char *path;
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struct btrfs_ioctl_fs_info_args fi_args;
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struct btrfs_ioctl_dev_info_args *di_args = NULL;
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int ret;
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int fdmnt;
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int i;
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char c;
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int fdres = -1;
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int err = 0;
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__u64 flags = 0;
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optind = 1;
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while ((c = getopt(argc, argv, "z")) != -1) {
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switch (c) {
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case 'z':
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flags = BTRFS_DEV_STATS_RESET;
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break;
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case '?':
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default:
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fprintf(stderr, "ERROR: device stat args invalid.\n"
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" device stat [-z] <path>|<device>\n"
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" -z to reset stats after reading.\n");
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return 1;
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}
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}
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if (optind + 1 != argc) {
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fprintf(stderr, "ERROR: device stat needs path|device as single"
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" argument\n");
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return 1;
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}
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path = argv[optind];
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fdmnt = open_file_or_dir(path);
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if (fdmnt < 0) {
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fprintf(stderr, "ERROR: can't access '%s'\n", path);
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return 12;
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}
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ret = get_fs_info(fdmnt, path, &fi_args, &di_args);
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if (ret) {
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fprintf(stderr, "ERROR: getting dev info for devstats failed: "
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"%s\n", strerror(-ret));
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err = 1;
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goto out;
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}
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if (!fi_args.num_devices) {
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fprintf(stderr, "ERROR: no devices found\n");
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err = 1;
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goto out;
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}
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for (i = 0; i < fi_args.num_devices; i++) {
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struct btrfs_ioctl_get_dev_stats args = {0};
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__u8 path[BTRFS_DEVICE_PATH_NAME_MAX + 1];
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strncpy((char *)path, (char *)di_args[i].path,
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BTRFS_DEVICE_PATH_NAME_MAX);
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path[BTRFS_DEVICE_PATH_NAME_MAX] = '\0';
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args.devid = di_args[i].devid;
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args.nr_items = BTRFS_DEV_STAT_VALUES_MAX;
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args.flags = flags;
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if (ioctl(fdmnt, BTRFS_IOC_GET_DEV_STATS, &args) < 0) {
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fprintf(stderr,
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"ERROR: ioctl(BTRFS_IOC_GET_DEV_STATS) on %s failed: %s\n",
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path, strerror(errno));
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err = 1;
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} else {
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if (args.nr_items >= BTRFS_DEV_STAT_WRITE_ERRS + 1)
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printf("[%s].write_io_errs %llu\n",
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path,
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(unsigned long long) args.values[
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BTRFS_DEV_STAT_WRITE_ERRS]);
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if (args.nr_items >= BTRFS_DEV_STAT_READ_ERRS + 1)
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printf("[%s].read_io_errs %llu\n",
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path,
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(unsigned long long) args.values[
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BTRFS_DEV_STAT_READ_ERRS]);
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if (args.nr_items >= BTRFS_DEV_STAT_FLUSH_ERRS + 1)
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printf("[%s].flush_io_errs %llu\n",
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path,
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(unsigned long long) args.values[
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BTRFS_DEV_STAT_FLUSH_ERRS]);
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if (args.nr_items >= BTRFS_DEV_STAT_CORRUPTION_ERRS + 1)
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printf("[%s].corruption_errs %llu\n",
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path,
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(unsigned long long) args.values[
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BTRFS_DEV_STAT_CORRUPTION_ERRS]);
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if (args.nr_items >= BTRFS_DEV_STAT_GENERATION_ERRS + 1)
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printf("[%s].generation_errs %llu\n",
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path,
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(unsigned long long) args.values[
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BTRFS_DEV_STAT_GENERATION_ERRS]);
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}
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}
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out:
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free(di_args);
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close(fdmnt);
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if (fdres > -1)
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close(fdres);
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return err;
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}
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const struct cmd_group device_cmd_group = {
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device_cmd_group_usage, NULL, {
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{ "add", cmd_add_dev, cmd_add_dev_usage, NULL, 0 },
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{ "delete", cmd_rm_dev, cmd_rm_dev_usage, NULL, 0 },
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{ "scan", cmd_scan_dev, cmd_scan_dev_usage, NULL, 0 },
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{ "ready", cmd_ready_dev, cmd_ready_dev_usage, NULL, 0 },
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{ "stats", cmd_dev_stats, cmd_dev_stats_usage, NULL, 0 },
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{ 0, 0, 0, 0, 0 }
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}
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};
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6
ctree.h
6
ctree.h
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@ -1044,6 +1044,12 @@ struct btrfs_root {
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#define BTRFS_QGROUP_LIMIT_KEY 244
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#define BTRFS_QGROUP_RELATION_KEY 246
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/*
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* Persistently stores the io stats in the device tree.
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* One key for all stats, (0, BTRFS_DEV_STATS_KEY, devid).
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*/
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#define BTRFS_DEV_STATS_KEY 249
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/*
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* string items are for debugging. They just store a short string of
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* data in the FS
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37
ioctl.h
37
ioctl.h
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@ -349,6 +349,39 @@ struct btrfs_ioctl_qgroup_create_args {
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__u64 qgroupid;
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};
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enum btrfs_dev_stat_values {
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/* disk I/O failure stats */
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BTRFS_DEV_STAT_WRITE_ERRS, /* EIO or EREMOTEIO from lower layers */
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BTRFS_DEV_STAT_READ_ERRS, /* EIO or EREMOTEIO from lower layers */
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BTRFS_DEV_STAT_FLUSH_ERRS, /* EIO or EREMOTEIO from lower layers */
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/* stats for indirect indications for I/O failures */
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BTRFS_DEV_STAT_CORRUPTION_ERRS, /* checksum error, bytenr error or
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* contents is illegal: this is an
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* indication that the block was damaged
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* during read or write, or written to
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* wrong location or read from wrong
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* location */
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BTRFS_DEV_STAT_GENERATION_ERRS, /* an indication that blocks have not
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* been written */
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BTRFS_DEV_STAT_VALUES_MAX
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};
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/* Reset statistics after reading; needs SYS_ADMIN capability */
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#define BTRFS_DEV_STATS_RESET (1ULL << 0)
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struct btrfs_ioctl_get_dev_stats {
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__u64 devid; /* in */
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__u64 nr_items; /* in/out */
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__u64 flags; /* in/out */
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/* out values: */
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__u64 values[BTRFS_DEV_STAT_VALUES_MAX];
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__u64 unused[128 - 2 - BTRFS_DEV_STAT_VALUES_MAX]; /* pad to 1k */
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};
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/* BTRFS_IOC_SNAP_CREATE is no longer used by the btrfs command */
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#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
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struct btrfs_ioctl_vol_args)
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@ -421,7 +454,6 @@ struct btrfs_ioctl_clone_range_args {
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struct btrfs_ioctl_ino_path_args)
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#define BTRFS_IOC_DEVICES_READY _IOR(BTRFS_IOCTL_MAGIC, 39, \
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struct btrfs_ioctl_vol_args)
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#define BTRFS_IOC_SET_RECEIVED_SUBVOL _IOWR(BTRFS_IOCTL_MAGIC, 37, \
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struct btrfs_ioctl_received_subvol_args)
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#define BTRFS_IOC_SEND _IOW(BTRFS_IOCTL_MAGIC, 38, struct btrfs_ioctl_send_args)
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@ -434,4 +466,7 @@ struct btrfs_ioctl_clone_range_args {
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struct btrfs_ioctl_qgroup_create_args)
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#define BTRFS_IOC_QGROUP_LIMIT _IOR(BTRFS_IOCTL_MAGIC, 43, \
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struct btrfs_ioctl_qgroup_limit_args)
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#define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \
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struct btrfs_ioctl_get_dev_stats)
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#endif
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@ -33,6 +33,8 @@ btrfs \- control a btrfs filesystem
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.PP
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\fBbtrfs\fP \fBdevice scan\fP\fI [--all-devices|<device> [<device>...]]\fP
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.PP
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\fBbtrfs\fP \fBdevice stats\fP [-z] {\fI<path>\fP|\fI<device>\fP}
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.PP
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\fBbtrfs\fP \fBdevice add\fP\fI <device> [<device>...] <path> \fP
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.PP
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\fBbtrfs\fP \fBdevice delete\fP\fI <device> [<device>...] <path> \fP
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@ -252,6 +254,18 @@ Balance the chunks of the filesystem identified by \fI<path>\fR
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across the devices.
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.TP
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\fBdevice stats\fP [-z] {\fI<path>\fP|\fI<device>\fP}
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Read and print the device IO stats for all devices of the filesystem
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identified by \fI<path>\fR or for a single \fI<device>\fR.
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.RS
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\fIOptions\fR
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.TP
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.B -z
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Reset stats to zero after reading them.
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.RE
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.TP
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\fBdevice add\fR\fI <dev> [<dev>..] <path>\fR
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Add device(s) to the filesystem identified by \fI<path>\fR.
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.TP
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@ -455,6 +455,9 @@ static void print_key_type(u64 objectid, u8 type)
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case BTRFS_QGROUP_LIMIT_KEY:
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printf("BTRFS_QGROUP_LIMIT_KEY");
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break;
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case BTRFS_DEV_STATS_KEY:
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printf("DEV_STATS_ITEM");
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break;
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default:
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printf("UNKNOWN.%d", type);
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};
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@ -777,6 +780,9 @@ void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
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str = l->data + btrfs_item_ptr_offset(l, i);
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printf("\t\titem data %.*s\n", btrfs_item_size(l, item), str);
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break;
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case BTRFS_DEV_STATS_KEY:
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printf("\t\tdevice stats\n");
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break;
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};
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fflush(stdout);
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}
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