diff options
author | Stefan Behrens <sbehrens@giantdisaster.de> | 2012-05-15 11:30:39 +0200 |
---|---|---|
committer | David Sterba <dsterba@suse.cz> | 2013-01-31 13:47:17 +0100 |
commit | 5b8826ddfd1c4fcdcfe9f78fd80cfeeac9de1b21 (patch) | |
tree | 7eb512fce9566f435d4b05a0b9ea1c70c583f20f /cmds-device.c | |
parent | 7a69dc4eecfd52841b11e0f9312f62d17e3479f5 (diff) |
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>
Diffstat (limited to 'cmds-device.c')
-rw-r--r-- | cmds-device.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/cmds-device.c b/cmds-device.c index 75ee293d..d4938f4e 100644 --- a/cmds-device.c +++ b/cmds-device.c @@ -284,12 +284,129 @@ static int cmd_ready_dev(int argc, char **argv) return ret; } +static const char * const cmd_dev_stats_usage[] = { + "btrfs device stats [-z] <path>|<device>", + "Show current device IO stats. -z to reset stats afterwards.", + NULL +}; + +static int cmd_dev_stats(int argc, char **argv) +{ + char *path; + struct btrfs_ioctl_fs_info_args fi_args; + struct btrfs_ioctl_dev_info_args *di_args = NULL; + int ret; + int fdmnt; + int i; + char c; + int fdres = -1; + int err = 0; + __u64 flags = 0; + + optind = 1; + while ((c = getopt(argc, argv, "z")) != -1) { + switch (c) { + case 'z': + flags = BTRFS_DEV_STATS_RESET; + break; + case '?': + default: + fprintf(stderr, "ERROR: device stat args invalid.\n" + " device stat [-z] <path>|<device>\n" + " -z to reset stats after reading.\n"); + return 1; + } + } + + if (optind + 1 != argc) { + fprintf(stderr, "ERROR: device stat needs path|device as single" + " argument\n"); + return 1; + } + + path = argv[optind]; + + fdmnt = open_file_or_dir(path); + if (fdmnt < 0) { + fprintf(stderr, "ERROR: can't access '%s'\n", path); + return 12; + } + + ret = get_fs_info(fdmnt, path, &fi_args, &di_args); + if (ret) { + fprintf(stderr, "ERROR: getting dev info for devstats failed: " + "%s\n", strerror(-ret)); + err = 1; + goto out; + } + if (!fi_args.num_devices) { + fprintf(stderr, "ERROR: no devices found\n"); + err = 1; + goto out; + } + + for (i = 0; i < fi_args.num_devices; i++) { + struct btrfs_ioctl_get_dev_stats args = {0}; + __u8 path[BTRFS_DEVICE_PATH_NAME_MAX + 1]; + + strncpy((char *)path, (char *)di_args[i].path, + BTRFS_DEVICE_PATH_NAME_MAX); + path[BTRFS_DEVICE_PATH_NAME_MAX] = '\0'; + + args.devid = di_args[i].devid; + args.nr_items = BTRFS_DEV_STAT_VALUES_MAX; + args.flags = flags; + + if (ioctl(fdmnt, BTRFS_IOC_GET_DEV_STATS, &args) < 0) { + fprintf(stderr, + "ERROR: ioctl(BTRFS_IOC_GET_DEV_STATS) on %s failed: %s\n", + path, strerror(errno)); + err = 1; + } else { + if (args.nr_items >= BTRFS_DEV_STAT_WRITE_ERRS + 1) + printf("[%s].write_io_errs %llu\n", + path, + (unsigned long long) args.values[ + BTRFS_DEV_STAT_WRITE_ERRS]); + if (args.nr_items >= BTRFS_DEV_STAT_READ_ERRS + 1) + printf("[%s].read_io_errs %llu\n", + path, + (unsigned long long) args.values[ + BTRFS_DEV_STAT_READ_ERRS]); + if (args.nr_items >= BTRFS_DEV_STAT_FLUSH_ERRS + 1) + printf("[%s].flush_io_errs %llu\n", + path, + (unsigned long long) args.values[ + BTRFS_DEV_STAT_FLUSH_ERRS]); + if (args.nr_items >= BTRFS_DEV_STAT_CORRUPTION_ERRS + 1) + printf("[%s].corruption_errs %llu\n", + path, + (unsigned long long) args.values[ + BTRFS_DEV_STAT_CORRUPTION_ERRS]); + if (args.nr_items >= BTRFS_DEV_STAT_GENERATION_ERRS + 1) + printf("[%s].generation_errs %llu\n", + path, + (unsigned long long) args.values[ + BTRFS_DEV_STAT_GENERATION_ERRS]); + } + } + +out: + free(di_args); + close(fdmnt); + if (fdres > -1) + close(fdres); + + return err; +} + const struct cmd_group device_cmd_group = { device_cmd_group_usage, NULL, { { "add", cmd_add_dev, cmd_add_dev_usage, NULL, 0 }, { "delete", cmd_rm_dev, cmd_rm_dev_usage, NULL, 0 }, { "scan", cmd_scan_dev, cmd_scan_dev_usage, NULL, 0 }, { "ready", cmd_ready_dev, cmd_ready_dev_usage, NULL, 0 }, + { "stats", cmd_dev_stats, cmd_dev_stats_usage, NULL, 0 }, { 0, 0, 0, 0, 0 } } }; |