Stefan Behrens
2012-May-22 10:54 UTC
[PATCH v4 0/3] Btrfs-progs: support 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. In order to share two utility functions between scrub and the dev stats code, these two functions are moved to utils.c and renamed. Since these functions are using open_file_or_dir(), and since the linking against utils.o and common.o was different, open_file_or_dir() was moved from common.c to utils.c. And since that function makes use of the function dirfd(3), the required XOPEN version was raised from 6 to 7. Changes v1->v2: - Remove a verbose printf() - Cast u64 to unsigned long long for printf() - Update the man page Changes v2->v3: - Rebase on Chris'' current master branch - Split the patch into three seperate patches because after rebasing, open_file_or_dir() was moved and additional changes had been necessary Changes v2->v3: - Add padding at end of ioctl structure Stefan Behrens (3): Btrfs-progs: move open_file_or_dir() to utils.c Btrfs-progs: make two utility functions globally available Btrfs-progs: add command to get/reset device stats via ioctl Makefile | 4 +- btrfsctl.c | 28 -------------- cmds-balance.c | 1 + cmds-device.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ cmds-inspect.c | 1 + cmds-scrub.c | 72 +--------------------------------- cmds-subvolume.c | 1 + commands.h | 3 -- common.c | 46 ---------------------- ctree.h | 6 +++ ioctl.h | 28 ++++++++++++++ man/btrfs.8.in | 14 +++++++ print-tree.c | 6 +++ utils.c | 97 +++++++++++++++++++++++++++++++++++++++++++++- utils.h | 7 ++++ 15 files changed, 276 insertions(+), 151 deletions(-) delete mode 100644 common.c -- 1.7.10.2 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Stefan Behrens
2012-May-22 10:54 UTC
[PATCH v4 1/3] Btrfs-progs: move open_file_or_dir() to utils.c
This is a preparation step to add support for device stats. The definition
of the function open_file_or_dir() is moved from common.c to utils.c in
order to be able to share some common code between scrub and the device
stats in the following step. That common code uses open_file_or_dir().
Since open_file_or_dir() makes use of the function dirfd(3), the required
XOPEN version was raised from 6 to 7.
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
---
Makefile | 4 ++--
btrfsctl.c | 28 ----------------------------
cmds-balance.c | 1 +
cmds-inspect.c | 1 +
cmds-subvolume.c | 1 +
commands.h | 3 ---
common.c | 46 ----------------------------------------------
utils.c | 31 +++++++++++++++++++++++++++++--
utils.h | 3 +++
9 files changed, 37 insertions(+), 81 deletions(-)
diff --git a/Makefile b/Makefile
index 79818e6..fe2b432 100644
--- a/Makefile
+++ b/Makefile
@@ -39,8 +39,8 @@ all: version $(progs) manpages
version:
bash version.sh
-btrfs: $(objects) btrfs.o help.o common.o $(cmds_objects)
- $(CC) $(CFLAGS) -o btrfs btrfs.o help.o common.o $(cmds_objects) \
+btrfs: $(objects) btrfs.o help.o $(cmds_objects)
+ $(CC) $(CFLAGS) -o btrfs btrfs.o help.o $(cmds_objects) \
$(objects) $(LDFLAGS) $(LIBS) -lpthread
calc-size: $(objects) calc-size.o
diff --git a/btrfsctl.c b/btrfsctl.c
index d45e2a7..f0584f3 100644
--- a/btrfsctl.c
+++ b/btrfsctl.c
@@ -63,34 +63,6 @@ static void print_usage(void)
exit(1);
}
-static int open_file_or_dir(const char *fname)
-{
- int ret;
- struct stat st;
- DIR *dirstream;
- int fd;
-
- ret = stat(fname, &st);
- if (ret < 0) {
- perror("stat:");
- exit(1);
- }
- if (S_ISDIR(st.st_mode)) {
- dirstream = opendir(fname);
- if (!dirstream) {
- perror("opendir");
- exit(1);
- }
- fd = dirfd(dirstream);
- } else {
- fd = open(fname, O_RDWR);
- }
- if (fd < 0) {
- perror("open");
- exit(1);
- }
- return fd;
-}
int main(int ac, char **av)
{
char *fname = NULL;
diff --git a/cmds-balance.c b/cmds-balance.c
index 38a7426..5793b5c 100644
--- a/cmds-balance.c
+++ b/cmds-balance.c
@@ -26,6 +26,7 @@
#include "ctree.h"
#include "ioctl.h"
#include "volumes.h"
+#include "utils.h"
#include "commands.h"
diff --git a/cmds-inspect.c b/cmds-inspect.c
index 2f0228f..7a8785b 100644
--- a/cmds-inspect.c
+++ b/cmds-inspect.c
@@ -22,6 +22,7 @@
#include "kerncompat.h"
#include "ioctl.h"
+#include "utils.h"
#include "commands.h"
diff --git a/cmds-subvolume.c b/cmds-subvolume.c
index 950fa8f..8ecd3f4 100644
--- a/cmds-subvolume.c
+++ b/cmds-subvolume.c
@@ -26,6 +26,7 @@
#include "kerncompat.h"
#include "ioctl.h"
+#include "utils.h"
#include "commands.h"
diff --git a/commands.h b/commands.h
index a303a50..aea4cb1 100644
--- a/commands.h
+++ b/commands.h
@@ -79,9 +79,6 @@ void help_ambiguous_token(const char *arg, const struct
cmd_group *grp);
void help_command_group(const struct cmd_group *grp, int argc, char **argv);
-/* common.c */
-int open_file_or_dir(const char *fname);
-
extern const struct cmd_group subvolume_cmd_group;
extern const struct cmd_group filesystem_cmd_group;
extern const struct cmd_group balance_cmd_group;
diff --git a/common.c b/common.c
deleted file mode 100644
index 03f6570..0000000
--- a/common.c
+++ /dev/null
@@ -1,46 +0,0 @@
-/*
- * 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 <sys/types.h>
-#include <sys/stat.h>
-#include <dirent.h>
-#include <fcntl.h>
-
-int open_file_or_dir(const char *fname)
-{
- int ret;
- struct stat st;
- DIR *dirstream;
- int fd;
-
- ret = stat(fname, &st);
- if (ret < 0) {
- return -1;
- }
- if (S_ISDIR(st.st_mode)) {
- dirstream = opendir(fname);
- if (!dirstream) {
- return -2;
- }
- fd = dirfd(dirstream);
- } else {
- fd = open(fname, O_RDWR);
- }
- if (fd < 0) {
- return -3;
- }
- return fd;
-}
diff --git a/utils.c b/utils.c
index ee7fa1b..6157115 100644
--- a/utils.c
+++ b/utils.c
@@ -16,8 +16,9 @@
* Boston, MA 021110-1307, USA.
*/
-#define _XOPEN_SOURCE 600
-#define __USE_XOPEN2K
+#define _XOPEN_SOURCE 700
+#define __USE_XOPEN2K8
+#define __XOPEN2K8 /* due to an error in dirent.h, to get dirfd() */
#include <stdio.h>
#include <stdlib.h>
#ifndef __CHECKER__
@@ -1206,3 +1207,29 @@ scan_again:
return 0;
}
+int open_file_or_dir(const char *fname)
+{
+ int ret;
+ struct stat st;
+ DIR *dirstream;
+ int fd;
+
+ ret = stat(fname, &st);
+ if (ret < 0) {
+ return -1;
+ }
+ if (S_ISDIR(st.st_mode)) {
+ dirstream = opendir(fname);
+ if (!dirstream) {
+ return -2;
+ }
+ fd = dirfd(dirstream);
+ } else {
+ fd = open(fname, O_RDWR);
+ }
+ if (fd < 0) {
+ return -3;
+ }
+ return fd;
+}
+
diff --git a/utils.h b/utils.h
index c5f55e1..e281002 100644
--- a/utils.h
+++ b/utils.h
@@ -19,6 +19,8 @@
#ifndef __UTILS__
#define __UTILS__
+#include "ctree.h"
+
#define BTRFS_MKFS_SYSTEM_GROUP_SIZE (4 * 1024 * 1024)
int make_btrfs(int fd, const char *device, const char *label,
@@ -46,4 +48,5 @@ int check_label(char *input);
int get_mountpt(char *dev, char *mntpt, size_t size);
int btrfs_scan_block_devices(int run_ioctl);
+int open_file_or_dir(const char *fname);
#endif
--
1.7.10.2
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Stefan Behrens
2012-May-22 10:54 UTC
[PATCH v4 2/3] Btrfs-progs: make two utility functions globally available
Two convenient utility functions that have so far been local to scrub are
moved to utils.c.
They will be used in the device stats code in a following commit.
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
---
cmds-scrub.c | 72 ++--------------------------------------------------------
utils.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++
utils.h | 4 ++++
3 files changed, 72 insertions(+), 70 deletions(-)
diff --git a/cmds-scrub.c b/cmds-scrub.c
index c4503f4..37a9890 100644
--- a/cmds-scrub.c
+++ b/cmds-scrub.c
@@ -967,74 +967,6 @@ static struct scrub_file_record *last_dev_scrub(
return NULL;
}
-static int scrub_device_info(int fd, u64 devid,
- struct btrfs_ioctl_dev_info_args *di_args)
-{
- int ret;
-
- di_args->devid = devid;
- memset(&di_args->uuid, ''\0'',
sizeof(di_args->uuid));
-
- ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
- return ret ? -errno : 0;
-}
-
-static int scrub_fs_info(int fd, char *path,
- struct btrfs_ioctl_fs_info_args *fi_args,
- struct btrfs_ioctl_dev_info_args **di_ret)
-{
- int ret = 0;
- int ndevs = 0;
- int i = 1;
- struct btrfs_fs_devices *fs_devices_mnt = NULL;
- struct btrfs_ioctl_dev_info_args *di_args;
- char mp[BTRFS_PATH_NAME_MAX + 1];
-
- memset(fi_args, 0, sizeof(*fi_args));
-
- ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
- if (ret && errno == EINVAL) {
- /* path is no mounted btrfs. try if it''s a device */
- ret = check_mounted_where(fd, path, mp, sizeof(mp),
- &fs_devices_mnt);
- if (!ret)
- return -EINVAL;
- if (ret < 0)
- return ret;
- fi_args->num_devices = 1;
- fi_args->max_id = fs_devices_mnt->latest_devid;
- i = fs_devices_mnt->latest_devid;
- memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
- close(fd);
- fd = open_file_or_dir(mp);
- if (fd < 0)
- return -errno;
- } else if (ret) {
- return -errno;
- }
-
- if (!fi_args->num_devices)
- return 0;
-
- di_args = *di_ret = malloc(fi_args->num_devices * sizeof(*di_args));
- if (!di_args)
- return -errno;
-
- for (; i <= fi_args->max_id; ++i) {
- BUG_ON(ndevs >= fi_args->num_devices);
- ret = scrub_device_info(fd, i, &di_args[ndevs]);
- if (ret == -ENODEV)
- continue;
- if (ret)
- return ret;
- ++ndevs;
- }
-
- BUG_ON(ndevs == 0);
-
- return 0;
-}
-
int mkdir_p(char *path)
{
int i;
@@ -1155,7 +1087,7 @@ static int scrub_start(int argc, char **argv, int resume)
return 12;
}
- ret = scrub_fs_info(fdmnt, path, &fi_args, &di_args);
+ ret = get_fs_info(fdmnt, path, &fi_args, &di_args);
if (ret) {
ERR(!do_quiet, "ERROR: getting dev info for scrub failed: "
"%s\n", strerror(-ret));
@@ -1621,7 +1553,7 @@ static int cmd_scrub_status(int argc, char **argv)
return 12;
}
- ret = scrub_fs_info(fdmnt, path, &fi_args, &di_args);
+ ret = get_fs_info(fdmnt, path, &fi_args, &di_args);
if (ret) {
fprintf(stderr, "ERROR: getting dev info for scrub failed: "
"%s\n", strerror(-ret));
diff --git a/utils.c b/utils.c
index 6157115..037f64b 100644
--- a/utils.c
+++ b/utils.c
@@ -1233,3 +1233,69 @@ int open_file_or_dir(const char *fname)
return fd;
}
+int get_device_info(int fd, u64 devid,
+ struct btrfs_ioctl_dev_info_args *di_args)
+{
+ int ret;
+
+ di_args->devid = devid;
+ memset(&di_args->uuid, ''\0'',
sizeof(di_args->uuid));
+
+ ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
+ return ret ? -errno : 0;
+}
+
+int get_fs_info(int fd, char *path, struct btrfs_ioctl_fs_info_args *fi_args,
+ struct btrfs_ioctl_dev_info_args **di_ret)
+{
+ int ret = 0;
+ int ndevs = 0;
+ int i = 1;
+ struct btrfs_fs_devices *fs_devices_mnt = NULL;
+ struct btrfs_ioctl_dev_info_args *di_args;
+ char mp[BTRFS_PATH_NAME_MAX + 1];
+
+ memset(fi_args, 0, sizeof(*fi_args));
+
+ ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
+ if (ret && (errno == EINVAL || errno == ENOTTY)) {
+ /* path is not a mounted btrfs. Try if it''s a device */
+ ret = check_mounted_where(fd, path, mp, sizeof(mp),
+ &fs_devices_mnt);
+ if (!ret)
+ return -EINVAL;
+ if (ret < 0)
+ return ret;
+ fi_args->num_devices = 1;
+ fi_args->max_id = fs_devices_mnt->latest_devid;
+ i = fs_devices_mnt->latest_devid;
+ memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
+ close(fd);
+ fd = open_file_or_dir(mp);
+ if (fd < 0)
+ return -errno;
+ } else if (ret) {
+ return -errno;
+ }
+
+ if (!fi_args->num_devices)
+ return 0;
+
+ di_args = *di_ret = malloc(fi_args->num_devices * sizeof(*di_args));
+ if (!di_args)
+ return -errno;
+
+ for (; i <= fi_args->max_id; ++i) {
+ BUG_ON(ndevs >= fi_args->num_devices);
+ ret = get_device_info(fd, i, &di_args[ndevs]);
+ if (ret == -ENODEV)
+ continue;
+ if (ret)
+ return ret;
+ ndevs++;
+ }
+
+ BUG_ON(ndevs == 0);
+
+ return 0;
+}
diff --git a/utils.h b/utils.h
index e281002..e33c231 100644
--- a/utils.h
+++ b/utils.h
@@ -49,4 +49,8 @@ int get_mountpt(char *dev, char *mntpt, size_t size);
int btrfs_scan_block_devices(int run_ioctl);
int open_file_or_dir(const char *fname);
+int get_device_info(int fd, u64 devid,
+ struct btrfs_ioctl_dev_info_args *di_args);
+int get_fs_info(int fd, char *path, struct btrfs_ioctl_fs_info_args *fi_args,
+ struct btrfs_ioctl_dev_info_args **di_ret);
#endif
--
1.7.10.2
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Stefan Behrens
2012-May-22 10:54 UTC
[PATCH v4 3/3] 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>
---
cmds-device.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
ctree.h | 6 +++
ioctl.h | 28 ++++++++++++++
man/btrfs.8.in | 14 +++++++
print-tree.c | 6 +++
5 files changed, 167 insertions(+)
diff --git a/cmds-device.c b/cmds-device.c
index db625a6..3417f03 100644
--- a/cmds-device.c
+++ b/cmds-device.c
@@ -246,11 +246,124 @@ static int cmd_scan_dev(int argc, char **argv)
return 0;
}
+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;
+ int cmd = BTRFS_IOC_GET_DEVICE_STATS;
+
+ optind = 1;
+ while ((c = getopt(argc, argv, "z")) != -1) {
+ switch (c) {
+ case ''z'':
+ cmd = BTRFS_IOC_GET_AND_RESET_DEVICE_STATS;
+ 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_device_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_IOCTL_GET_DEVICE_STATS_MAX_NR_ITEMS;
+
+ if (ioctl(fdmnt, cmd, &args) < 0) {
+ fprintf(stderr, "ERROR: ioctl(%s) on %s failed: %s\n",
+ BTRFS_IOC_GET_AND_RESET_DEVICE_STATS == cmd ?
+ "BTRFS_IOC_GET_AND_RESET_DEVICE_STATS" :
+ "BTRFS_IOC_GET_DEVICE_STATS",
+ path, strerror(errno));
+ err = 1;
+ } else {
+ if (args.nr_items >= 1)
+ printf("[%s].cnt_write_io_errs %llu\n",
+ path, (unsigned long long)
+ args.cnt_write_io_errs);
+ if (args.nr_items >= 2)
+ printf("[%s].cnt_read_io_errs %llu\n",
+ path, (unsigned long long)
+ args.cnt_read_io_errs);
+ if (args.nr_items >= 3)
+ printf("[%s].cnt_flush_io_errs %llu\n",
+ path, (unsigned long long)
+ args.cnt_flush_io_errs);
+ if (args.nr_items >= 4)
+ printf("[%s].cnt_corruption_errs %llu\n",
+ path, (unsigned long long)
+ args.cnt_corruption_errs);
+ if (args.nr_items >= 5)
+ printf("[%s].cnt_generation_errs %llu\n",
+ path, (unsigned long long)
+ args.cnt_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 },
+ { "stats", cmd_dev_stats, cmd_dev_stats_usage, NULL, 0 },
{ 0, 0, 0, 0, 0 }
}
};
diff --git a/ctree.h b/ctree.h
index 6545c50..db0de5e 100644
--- a/ctree.h
+++ b/ctree.h
@@ -943,6 +943,12 @@ struct btrfs_root {
#define BTRFS_BALANCE_ITEM_KEY 248
/*
+ * Persistantly stores the io stats in the device tree.
+ * One key for all stats, (0, BTRFS_DEVICE_STATS_KEY, devid).
+ */
+#define BTRFS_DEVICE_STATS_KEY 249
+
+/*
* string items are for debugging. They just store a short string of
* data in the FS
*/
diff --git a/ioctl.h b/ioctl.h
index f2e5d8d..d2fbaf9 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -272,6 +272,30 @@ struct btrfs_ioctl_logical_ino_args {
__u64 inodes;
};
+#define BTRFS_IOCTL_GET_DEVICE_STATS_MAX_NR_ITEMS 5
+struct btrfs_ioctl_get_device_stats {
+ __u64 devid; /* in */
+ __u64 nr_items; /* in/out */
+
+ /* out values: */
+
+ /* disk I/O failure stats */
+ __u64 cnt_write_io_errs; /* EIO or EREMOTEIO from lower layers */
+ __u64 cnt_read_io_errs; /* EIO or EREMOTEIO from lower layers */
+ __u64 cnt_flush_io_errs; /* EIO or EREMOTEIO from lower layers */
+
+ /* stats for indirect indications for I/O failures */
+ __u64 cnt_corruption_errs; /* checksum error, bytenr error or
+ * contents is illegal: this is an
+ * indication that the block was damaged
+ * during read or write, or written to
+ * wrong location or read from wrong
+ * location */
+ __u64 cnt_generation_errs; /* an indication that blocks have not
+ * been written */
+ __u64 unused[121]; /* pad to 1k */
+};
+
/* BTRFS_IOC_SNAP_CREATE is no longer used by the btrfs command */
#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
struct btrfs_ioctl_vol_args)
@@ -330,5 +354,9 @@ struct btrfs_ioctl_logical_ino_args {
struct btrfs_ioctl_ino_path_args)
#define BTRFS_IOC_LOGICAL_INO _IOWR(BTRFS_IOCTL_MAGIC, 36, \
struct btrfs_ioctl_ino_path_args)
+#define BTRFS_IOC_GET_DEVICE_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \
+ struct btrfs_ioctl_get_device_stats)
+#define BTRFS_IOC_GET_AND_RESET_DEVICE_STATS _IOWR(BTRFS_IOCTL_MAGIC, 53, \
+ struct btrfs_ioctl_get_device_stats)
#endif
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index be478e0..c903fee 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -35,6 +35,8 @@ btrfs \- control a btrfs filesystem
.PP
\fBbtrfs\fP \fBdevice show\fP\fI [--all-devices|<uuid>|<label>]\fP
.PP
+\fBbtrfs\fP \fBdevice stats\fP [-z] {\fI<path>\fP|\fI<device>\fP}
+.PP
\fBbtrfs\fP \fBdevice add\fP\fI <device> [<device>...] <path>
\fP
.PP
\fBbtrfs\fP \fBdevice delete\fP\fI <device> [<device>...]
<path> \fP
@@ -214,6 +216,18 @@ Balance the chunks of the filesystem identified by
\fI<path>\fR
across the devices.
.TP
+\fBdevice stats\fP [-z] {\fI<path>\fP|\fI<device>\fP}
+Read and print the device IO stats for all devices of the filesystem
+identified by \fI<path>\fR or for a single \fI<device>\fR.
+
+.RS
+\fIOptions\fR
+.TP
+.B -z
+Reset stats to zero after reading them.
+.RE
+.TP
+
\fBdevice add\fR\fI <dev> [<dev>..] <path>\fR
Add device(s) to the filesystem identified by \fI<path>\fR.
.TP
diff --git a/print-tree.c b/print-tree.c
index fc134c0..7520601 100644
--- a/print-tree.c
+++ b/print-tree.c
@@ -357,6 +357,9 @@ static void print_key_type(u8 type)
case BTRFS_STRING_ITEM_KEY:
printf("STRING_ITEM");
break;
+ case BTRFS_DEVICE_STATS_KEY:
+ printf("DEVICE_STATS_ITEM");
+ break;
default:
printf("UNKNOWN");
};
@@ -609,6 +612,9 @@ void btrfs_print_leaf(struct btrfs_root *root, struct
extent_buffer *l)
str = l->data + btrfs_item_ptr_offset(l, i);
printf("\t\titem data %.*s\n", btrfs_item_size(l, item), str);
break;
+ case BTRFS_DEVICE_STATS_KEY:
+ printf("\t\tdevice stats\n");
+ break;
};
fflush(stdout);
}
--
1.7.10.2
--
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