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filesystem-usage.c
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filesystem-usage.c
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/*
* 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 "kerncompat.h"
#include <sys/ioctl.h>
#include <sys/statvfs.h>
#include <linux/limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <dirent.h>
#include <limits.h>
#include <uuid/uuid.h>
#include "kernel-lib/sizes.h"
#include "kernel-shared/ctree.h"
#include "kernel-shared/disk-io.h"
#include "kernel-shared/volumes.h"
#include "kernel-shared/accessors.h"
#include "kernel-shared/uapi/btrfs_tree.h"
#include "common/defs.h"
#include "common/utils.h"
#include "common/string-table.h"
#include "common/open-utils.h"
#include "common/units.h"
#include "common/help.h"
#include "common/device-utils.h"
#include "common/sysfs-utils.h"
#include "common/messages.h"
#include "common/path-utils.h"
#include "common/tree-search.h"
#include "cmds/filesystem-usage.h"
#include "cmds/commands.h"
/*
* Add the chunk info to the chunk_info list
*/
static int add_info_to_list(struct array *chunkinfos, struct btrfs_chunk *chunk)
{
u64 type = btrfs_stack_chunk_type(chunk);
u64 size = btrfs_stack_chunk_length(chunk);
int num_stripes = btrfs_stack_chunk_num_stripes(chunk);
int j;
for (j = 0 ; j < num_stripes ; j++) {
int i;
struct chunk_info *p = NULL;
struct btrfs_stripe *stripe;
u64 devid;
stripe = btrfs_stripe_nr(chunk, j);
devid = btrfs_stack_stripe_devid(stripe);
for (i = 0; i < chunkinfos->length; i++) {
struct chunk_info *cinfo = chunkinfos->data[i];
if (cinfo->type == type &&
cinfo->devid == devid &&
cinfo->num_stripes == num_stripes ) {
p = cinfo;
break;
}
}
if (!p) {
int ret;
p = calloc(1, sizeof(struct chunk_info));
if (!p) {
error_msg(ERROR_MSG_MEMORY, NULL);
return -ENOMEM;
}
p->devid = devid;
p->type = type;
p->size = 0;
p->num_stripes = num_stripes;
ret = array_append(chunkinfos, p);
if (ret < 0) {
error_msg(ERROR_MSG_MEMORY, NULL);
return -ENOMEM;
}
}
p->size += size;
}
return 0;
}
/*
* Helper to sort the chunk type
*/
static int cmp_chunk_block_group(u64 f1, u64 f2)
{
u64 mask;
if ((f1 & BTRFS_BLOCK_GROUP_TYPE_MASK) ==
(f2 & BTRFS_BLOCK_GROUP_TYPE_MASK))
mask = BTRFS_BLOCK_GROUP_PROFILE_MASK;
else if (f2 & BTRFS_BLOCK_GROUP_SYSTEM)
return -1;
else if (f1 & BTRFS_BLOCK_GROUP_SYSTEM)
return +1;
else
mask = BTRFS_BLOCK_GROUP_TYPE_MASK;
if ((f1 & mask) > (f2 & mask))
return +1;
else if ((f1 & mask) < (f2 & mask))
return -1;
else
return 0;
}
/*
* Helper to sort the chunk
*/
static int cmp_chunk_info(const void *a, const void *b)
{
const struct chunk_info * const *pa = a;
const struct chunk_info * const *pb = b;
return cmp_chunk_block_group((*pa)->type, (*pb)->type);
}
static int load_chunk_info(int fd, struct array *chunkinfos)
{
int ret;
struct btrfs_tree_search_args args;
struct btrfs_ioctl_search_key *sk;
unsigned long off = 0;
int i;
memset(&args, 0, sizeof(args));
sk = btrfs_tree_search_sk(&args);
/*
* there may be more than one ROOT_ITEM key if there are
* snapshots pending deletion, we have to loop through
* them.
*/
sk->tree_id = BTRFS_CHUNK_TREE_OBJECTID;
sk->min_objectid = 0;
sk->min_type = (u8)-1;
sk->min_offset = 0;
sk->max_objectid = (u64)-1;
sk->max_type = 0;
sk->max_offset = (u64)-1;
sk->min_transid = 0;
sk->max_transid = (u64)-1;
sk->nr_items = 4096;
while (1) {
ret = btrfs_tree_search_ioctl(fd, &args);
if (ret < 0) {
if (errno == EPERM)
return -errno;
error("cannot look up chunk tree info: %m");
return 1;
}
/* the ioctl returns the number of item it found in nr_items */
if (sk->nr_items == 0)
break;
off = 0;
for (i = 0; i < sk->nr_items; i++) {
struct btrfs_chunk *item;
struct btrfs_ioctl_search_header sh;
memcpy(&sh, btrfs_tree_search_data(&args, off), sizeof(sh));
off += sizeof(sh);
item = btrfs_tree_search_data(&args, off);
ret = add_info_to_list(chunkinfos, item);
if (ret)
return 1;
off += sh.len;
sk->min_objectid = sh.objectid;
sk->min_type = sh.type;
sk->min_offset = sh.offset + 1;
}
if (!sk->min_offset) /* overflow */
sk->min_type++;
else
continue;
if (!sk->min_type)
sk->min_objectid++;
else
continue;
if (!sk->min_objectid)
break;
}
qsort(chunkinfos->data, chunkinfos->length, sizeof(struct chunk_info *),
cmp_chunk_info);
return 0;
}
/*
* Helper to sort the struct btrfs_ioctl_space_info
*/
static int cmp_btrfs_ioctl_space_info(const void *a, const void *b)
{
return cmp_chunk_block_group(
((struct btrfs_ioctl_space_info *)a)->flags,
((struct btrfs_ioctl_space_info *)b)->flags);
}
/*
* This function load all the information about the space usage
*/
static struct btrfs_ioctl_space_args *load_space_info(int fd, const char *path)
{
struct btrfs_ioctl_space_args *sargs = NULL, *sargs_orig = NULL;
int ret, count;
sargs_orig = sargs = calloc(1, sizeof(struct btrfs_ioctl_space_args));
if (!sargs) {
error_msg(ERROR_MSG_MEMORY, NULL);
return NULL;
}
sargs->space_slots = 0;
sargs->total_spaces = 0;
ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
if (ret < 0) {
error("cannot get space info on '%s': %m", path);
free(sargs);
return NULL;
}
if (!sargs->total_spaces) {
free(sargs);
pr_verbose(LOG_DEFAULT, "No chunks found\n");
return NULL;
}
count = sargs->total_spaces;
sargs = realloc(sargs, sizeof(struct btrfs_ioctl_space_args) +
(count * sizeof(struct btrfs_ioctl_space_info)));
if (!sargs) {
free(sargs_orig);
error_msg(ERROR_MSG_MEMORY, NULL);
return NULL;
}
sargs->space_slots = count;
sargs->total_spaces = 0;
ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
if (ret < 0) {
error("cannot get space info with %u slots: %m",
count);
free(sargs);
return NULL;
}
qsort(&(sargs->spaces), count, sizeof(struct btrfs_ioctl_space_info),
cmp_btrfs_ioctl_space_info);
return sargs;
}
/*
* Compute the ratio between logical space used over logical space allocated
* by profile basis
*/
static void get_raid56_logical_ratio(struct btrfs_ioctl_space_args *sargs,
u64 type, double *data_ratio,
double *metadata_ratio,
double *system_ratio)
{
u64 l_data_chunk = 0, l_data_used = 0;
u64 l_metadata_chunk = 0, l_metadata_used = 0;
u64 l_system_chunk = 0, l_system_used = 0;
int i;
for (i = 0; i < sargs->total_spaces; i++) {
u64 flags = sargs->spaces[i].flags;
if (!(flags & type))
continue;
if (flags & BTRFS_BLOCK_GROUP_DATA) {
l_data_used += sargs->spaces[i].used_bytes;
l_data_chunk += sargs->spaces[i].total_bytes;
} else if (flags & BTRFS_BLOCK_GROUP_METADATA) {
l_metadata_used += sargs->spaces[i].used_bytes;
l_metadata_chunk += sargs->spaces[i].total_bytes;
} else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) {
l_system_used += sargs->spaces[i].used_bytes;
l_system_chunk += sargs->spaces[i].total_bytes;
}
}
*data_ratio = -1.0;
*metadata_ratio = -1.0;
*system_ratio = -1.0;
if (l_data_chunk)
*data_ratio = (double)l_data_used / l_data_chunk;
if (l_metadata_chunk)
*metadata_ratio = (double)l_metadata_used / l_metadata_chunk;
if (l_system_chunk)
*system_ratio = (double)l_system_used / l_system_chunk;
}
/*
* Compute the "raw" space allocated for a chunk (r_*_chunks)
* and the "raw" space used by a chunk (r_*_used)
*/
static void get_raid56_space_info(struct btrfs_ioctl_space_args *sargs,
const struct array *chunkinfos,
double *max_data_ratio,
u64 *r_data_chunks, u64 *r_data_used,
u64 *r_metadata_chunks, u64 *r_metadata_used,
u64 *r_system_chunks, u64 *r_system_used)
{
double l_data_ratio_r5, l_metadata_ratio_r5, l_system_ratio_r5;
double l_data_ratio_r6, l_metadata_ratio_r6, l_system_ratio_r6;
get_raid56_logical_ratio(sargs, BTRFS_BLOCK_GROUP_RAID5,
&l_data_ratio_r5, &l_metadata_ratio_r5, &l_system_ratio_r5);
get_raid56_logical_ratio(sargs, BTRFS_BLOCK_GROUP_RAID6,
&l_data_ratio_r6, &l_metadata_ratio_r6, &l_system_ratio_r6);
for (int i = 0; i < chunkinfos->length; i++) {
const struct chunk_info *info_ptr = chunkinfos->data[i];
int parities_count;
u64 size;
double l_data_ratio, l_metadata_ratio, l_system_ratio, rt;
parities_count = btrfs_bg_type_to_nparity(info_ptr->type);
if (info_ptr->type & BTRFS_BLOCK_GROUP_RAID5) {
l_data_ratio = l_data_ratio_r5;
l_metadata_ratio = l_metadata_ratio_r5;
l_system_ratio = l_system_ratio_r5;
} else if (info_ptr->type & BTRFS_BLOCK_GROUP_RAID6) {
l_data_ratio = l_data_ratio_r6;
l_metadata_ratio = l_metadata_ratio_r6;
l_system_ratio = l_system_ratio_r6;
} else {
continue;
}
rt = (double)info_ptr->num_stripes /
(info_ptr->num_stripes - parities_count);
if (rt > *max_data_ratio)
*max_data_ratio = rt;
/*
* size is the total disk(s) space occupied by a chunk
* the product of 'size' and '*_ratio' is "in average"
* the disk(s) space used by the data
*/
size = info_ptr->size / (info_ptr->num_stripes - parities_count);
if (info_ptr->type & BTRFS_BLOCK_GROUP_DATA) {
UASSERT(l_data_ratio >= 0);
*r_data_chunks += size;
*r_data_used += size * l_data_ratio;
} else if (info_ptr->type & BTRFS_BLOCK_GROUP_METADATA) {
UASSERT(l_metadata_ratio >= 0);
*r_metadata_chunks += size;
*r_metadata_used += size * l_metadata_ratio;
} else if (info_ptr->type & BTRFS_BLOCK_GROUP_SYSTEM) {
UASSERT(l_system_ratio >= 0);
*r_system_chunks += size;
*r_system_used += size * l_system_ratio;
}
}
}
static u64 get_first_device_zone_size(int fd)
{
int dirfd;
DIR *dir;
struct dirent *de;
char name[NAME_MAX] = {0};
u64 ret;
dirfd = sysfs_open_fsid_dir(fd, "devices");
if (dirfd < 0)
return 0;
dir = fdopendir(dirfd);
if (!dir) {
ret = 0;
goto out;
}
while (1) {
de = readdir(dir);
if (strcmp(".", de->d_name) == 0 || strcmp("..", de->d_name) == 0)
continue;
strcpy(name, de->d_name);
name[NAME_MAX - 1] = 0;
break;
}
ret = device_get_zone_size(fd, name);
ret *= 512;
out:
closedir(dir);
return ret;
}
static u64 calc_slack_size(const struct device_info *devinfo)
{
if (devinfo->device_size > 0)
return devinfo->device_size - devinfo->size;
return 0;
}
#define MIN_UNALOCATED_THRESH SZ_16M
static int print_filesystem_usage_overall(int fd, const struct array *chunkinfos,
const struct array *devinfos, const char *path, unsigned unit_mode)
{
struct btrfs_ioctl_space_args *sargs = NULL;
char *tmp;
int i;
int ret = 0;
int width = 10; /* default 10 for human units */
/*
* r_* prefix is for raw data
* l_* prefix is for logical
* *_used suffix is for space used for data or metadata
* *_chunks suffix is for total space used by the chunk
*/
u64 r_total_size = 0; /* filesystem size, sum of device sizes */
u64 r_total_chunks = 0; /* sum of chunks sizes on disk(s) */
u64 r_total_used = 0;
u64 r_total_unused = 0;
u64 r_total_missing = 0; /* sum of missing devices size */
u64 r_total_slack = 0;
u64 r_data_used = 0;
u64 r_data_chunks = 0;
u64 l_data_chunks = 0;
u64 r_metadata_used = 0;
u64 r_metadata_chunks = 0;
u64 l_metadata_chunks = 0;
u64 r_system_used = 0;
u64 r_system_chunks = 0;
double data_ratio;
double metadata_ratio;
/* logical */
u64 l_global_reserve = 0;
u64 l_global_reserve_used = 0;
u64 free_estimated = 0;
u64 free_min = 0;
u64 zone_unusable = 0;
double max_data_ratio = 1.0;
bool mixed = false;
struct statvfs statvfs_buf;
struct btrfs_ioctl_feature_flags feature_flags;
bool raid56 = false;
bool unreliable_allocated = false;
sargs = load_space_info(fd, path);
if (!sargs) {
ret = 1;
goto exit;
}
r_total_size = 0;
for (i = 0; i < devinfos->length; i++) {
const struct device_info *devinfo = devinfos->data[i];
r_total_size += devinfo->size;
r_total_slack += calc_slack_size(devinfo);
if (!devinfo->device_size)
r_total_missing += devinfo->size;
}
if (r_total_size == 0) {
error("cannot get space info on '%s': %m", path);
ret = 1;
goto exit;
}
get_raid56_space_info(sargs, chunkinfos, &max_data_ratio,
&r_data_chunks, &r_data_used,
&r_metadata_chunks, &r_metadata_used,
&r_system_chunks, &r_system_used);
for (i = 0; i < sargs->total_spaces; i++) {
int ratio;
u64 flags = sargs->spaces[i].flags;
ratio = btrfs_bg_type_to_ncopies(flags);
/*
* The RAID5/6 ratio depends on the number of stripes and is
* computed separately. Setting ratio to 0 will not account
* the chunks in this loop.
*/
if (flags & BTRFS_BLOCK_GROUP_RAID56_MASK) {
ratio = 0;
raid56 = true;
}
if (ratio > max_data_ratio)
max_data_ratio = ratio;
if (flags & BTRFS_SPACE_INFO_GLOBAL_RSV) {
l_global_reserve = sargs->spaces[i].total_bytes;
l_global_reserve_used = sargs->spaces[i].used_bytes;
}
if ((flags & (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA))
== (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA)) {
mixed = true;
} else {
/*
* As mixed mode is not supported in zoned mode, this
* will account for all profile types
*/
u64 unusable;
unusable = device_get_zone_unusable(fd, flags);
if (unusable != DEVICE_ZONE_UNUSABLE_UNKNOWN)
zone_unusable += unusable;
}
if (flags & BTRFS_BLOCK_GROUP_DATA) {
r_data_used += sargs->spaces[i].used_bytes * ratio;
r_data_chunks += sargs->spaces[i].total_bytes * ratio;
l_data_chunks += sargs->spaces[i].total_bytes;
}
if (flags & BTRFS_BLOCK_GROUP_METADATA) {
r_metadata_used += sargs->spaces[i].used_bytes * ratio;
r_metadata_chunks += sargs->spaces[i].total_bytes * ratio;
l_metadata_chunks += sargs->spaces[i].total_bytes;
}
if (flags & BTRFS_BLOCK_GROUP_SYSTEM) {
r_system_used += sargs->spaces[i].used_bytes * ratio;
r_system_chunks += sargs->spaces[i].total_bytes * ratio;
}
}
r_total_chunks = r_data_chunks + r_system_chunks;
r_total_used = r_data_used + r_system_used;
if (!mixed) {
r_total_chunks += r_metadata_chunks;
r_total_used += r_metadata_used;
}
r_total_unused = r_total_size - r_total_chunks;
/* Raw / Logical = raid factor, >= 1 */
data_ratio = (double)r_data_chunks / l_data_chunks;
if (mixed)
metadata_ratio = data_ratio;
else
metadata_ratio = (double)r_metadata_chunks / l_metadata_chunks;
/*
* We're able to fill at least DATA for the unused space
*
* With mixed raid levels, this gives a rough estimate but more
* accurate than just counting the logical free space
* (l_data_chunks - l_data_used)
*
* In non-mixed case there's no difference.
*/
free_estimated = (r_data_chunks - r_data_used) / data_ratio;
/*
* For mixed-bg the metadata are left out in calculations thus global
* reserve would be lost. Part of it could be permanently allocated,
* we have to subtract the used bytes so we don't go under zero free.
*/
if (mixed)
free_estimated -= l_global_reserve - l_global_reserve_used;
free_min = free_estimated;
/* Chop unallocatable space */
/* FIXME: must be applied per device */
if (r_total_unused >= MIN_UNALOCATED_THRESH) {
free_estimated += r_total_unused / data_ratio;
/* Match the calculation of 'df', use the highest raid ratio */
free_min += r_total_unused / max_data_ratio;
}
if (unit_mode != UNITS_HUMAN)
width = 18;
ret = statvfs(path, &statvfs_buf);
if (ret) {
warning("cannot get space info with statvfs() on '%s': %m", path);
memset(&statvfs_buf, 0, sizeof(statvfs_buf));
ret = 0;
}
/*
* If we don't have any chunk information (e.g. due to missing
* privileges) and there's a raid56 profile, the computation of
* "unallocated", "data/metadata ratio", "free estimated" are wrong.
*/
unreliable_allocated = (raid56 && chunkinfos->length == 0);
if (unreliable_allocated) {
warning("radid56 found, we cannots compute some values, run as root if needed");
ret = 1;
goto exit;
}
pr_verbose(LOG_DEFAULT, "Overall:\n");
pr_verbose(LOG_DEFAULT, " Device size:\t\t%*s\n", width,
pretty_size_mode(r_total_size, unit_mode));
pr_verbose(LOG_DEFAULT, " Device allocated:\t\t%*s\n", width,
pretty_size_mode(r_total_chunks, unit_mode));
pr_verbose(LOG_DEFAULT, " Device unallocated:\t\t%*s\n", width,
pretty_size_mode(r_total_unused, unit_mode | UNITS_NEGATIVE));
pr_verbose(LOG_DEFAULT, " Device missing:\t\t%*s\n", width,
pretty_size_mode(r_total_missing, unit_mode));
pr_verbose(LOG_DEFAULT, " Device slack:\t\t%*s\n", width,
pretty_size_mode(r_total_slack, unit_mode));
ret = ioctl(fd, BTRFS_IOC_GET_FEATURES, &feature_flags);
if (ret == 0 && (feature_flags.incompat_flags & BTRFS_FEATURE_INCOMPAT_ZONED)) {
u64 zone_size;
pr_verbose(LOG_DEFAULT, " Device zone unusable:\t%*s\n", width,
pretty_size_mode(zone_unusable, unit_mode));
zone_size = get_first_device_zone_size(fd);
pr_verbose(LOG_DEFAULT, " Device zone size:\t\t%*s\n", width,
pretty_size_mode(zone_size, unit_mode));
}
pr_verbose(LOG_DEFAULT, " Used:\t\t\t%*s\n", width,
pretty_size_mode(r_total_used, unit_mode));
pr_verbose(LOG_DEFAULT, " Free (estimated):\t\t%*s\t(",
width,
pretty_size_mode(free_estimated, unit_mode));
pr_verbose(LOG_DEFAULT, "min: %s)\n", pretty_size_mode(free_min, unit_mode));
pr_verbose(LOG_DEFAULT, " Free (statfs, df):\t\t%*s\n", width,
pretty_size_mode(statvfs_buf.f_bavail * statvfs_buf.f_bsize, unit_mode));
pr_verbose(LOG_DEFAULT, " Data ratio:\t\t\t%*.2f\n",
width, data_ratio);
pr_verbose(LOG_DEFAULT, " Metadata ratio:\t\t%*.2f\n",
width, metadata_ratio);
pr_verbose(LOG_DEFAULT, " Global reserve:\t\t%*s\t(used: %s)\n", width,
pretty_size_mode(l_global_reserve, unit_mode),
pretty_size_mode(l_global_reserve_used, unit_mode));
tmp = btrfs_test_for_multiple_profiles(fd);
if (tmp[0])
pr_verbose(LOG_DEFAULT, " Multiple profiles:\t\t%*s\t(%s)\n", width, "yes", tmp);
else
pr_verbose(LOG_DEFAULT, " Multiple profiles:\t\t%*s\n", width, "no");
free(tmp);
exit:
if (sargs)
free(sargs);
return ret;
}
/*
* Helper to sort the device_info structure
*/
static int cmp_device_info(const void *a, const void *b)
{
const struct device_info * const *deva = a;
const struct device_info * const *devb = b;
if ((*deva)->devid < (*devb)->devid)
return -1;
if ((*deva)->devid > (*devb)->devid)
return 1;
return 0;
}
int dev_to_fsid(const char *dev, u8 *fsid)
{
struct btrfs_super_block disk_super;
int ret;
int fd;
fd = open(dev, O_RDONLY);
if (fd < 0) {
ret = -errno;
return ret;
}
ret = btrfs_read_dev_super(fd, &disk_super,
BTRFS_SUPER_INFO_OFFSET, SBREAD_DEFAULT);
if (ret)
goto out;
memcpy(fsid, disk_super.fsid, BTRFS_FSID_SIZE);
ret = 0;
out:
close(fd);
return ret;
}
static int device_is_seed(int fd, const char *dev_path, u64 devid, const u8 *mnt_fsid)
{
char fsid_str[BTRFS_UUID_UNPARSED_SIZE];
char fsid_path[PATH_MAX];
char devid_str[20];
u8 fsid[BTRFS_UUID_SIZE];
int ret = -1;
int sysfs_fd;
snprintf(devid_str, 20, "%llu", devid);
/* devinfo/<devid>/fsid */
ret = path_cat3_out(fsid_path, "devinfo", devid_str, "fsid");
if (ret < 0)
return ret;
/* /sys/fs/btrfs/<fsid>/devinfo/<devid>/fsid */
sysfs_fd = sysfs_open_fsid_file(fd, fsid_path);
if (sysfs_fd >= 0) {
sysfs_read_file(sysfs_fd, fsid_str, BTRFS_UUID_UNPARSED_SIZE);
fsid_str[BTRFS_UUID_UNPARSED_SIZE - 1] = 0;
ret = uuid_parse(fsid_str, fsid);
close(sysfs_fd);
}
if (ret || sysfs_fd < 0) {
ret = dev_to_fsid(dev_path, fsid);
if (ret)
return ret;
}
if (memcmp(mnt_fsid, fsid, BTRFS_FSID_SIZE) != 0)
return 0;
return -1;
}
/*
* This function loads the device_info structure and put them in an array
*/
static int load_device_info(int fd, struct array *devinfos)
{
int ret, i, ndevs;
struct btrfs_ioctl_fs_info_args fi_args;
struct btrfs_ioctl_dev_info_args dev_info;
struct device_info *info;
ret = ioctl(fd, BTRFS_IOC_FS_INFO, &fi_args);
if (ret < 0) {
if (errno == EPERM)
return -errno;
error("cannot get filesystem info: %m");
return 1;
}
for (i = 0, ndevs = 0 ; i <= fi_args.max_id ; i++) {
if (ndevs >= fi_args.num_devices) {
error("unexpected number of devices: %d >= %llu", ndevs,
fi_args.num_devices);
error(
"if seed device is used, try running this command as root");
goto out;
}
memset(&dev_info, 0, sizeof(dev_info));
ret = device_get_info(fd, i, &dev_info);
if (ret == -ENODEV)
continue;
if (ret) {
error("cannot get info about device devid=%d", i);
goto out;
}
/*
* Skip seed device by checking device's fsid (requires root if
* kernel is not patched to provide fsid from the sysfs).
* And we will skip only if device_is_seed is successful and dev
* is a seed device.
* Ignore any other error including -EACCES, which is seen when
* a non-root process calls dev_to_fsid(path)->open(path).
*/
ret = device_is_seed(fd, (const char *)dev_info.path, i, fi_args.fsid);
if (!ret)
continue;
info = calloc(1, sizeof(struct device_info));
if (!info) {
error_msg(ERROR_MSG_MEMORY, NULL);
return 1;
}
ret = array_append(devinfos, info);
if (ret < 0) {
error_msg(ERROR_MSG_MEMORY, NULL);
return -ENOMEM;
}
info->devid = dev_info.devid;
if (!dev_info.path[0]) {
strcpy(info->path, "missing");
} else {
strcpy(info->path, (char *)dev_info.path);
info->device_size =
device_get_partition_size((const char *)dev_info.path);
}
info->size = dev_info.total_bytes;
ndevs++;
}
if (ndevs != fi_args.num_devices) {
error("unexpected number of devices: %d != %llu", ndevs,
fi_args.num_devices);
goto out;
}
qsort(devinfos->data, devinfos->length, sizeof(struct device_info *), cmp_device_info);
return 0;
out:
return ret;
}
int load_chunk_and_device_info(int fd, struct array *chunkinfos, struct array *devinfos)
{
int ret;
ret = load_chunk_info(fd, chunkinfos);
if (ret == -EPERM) {
warning(
"cannot read detailed chunk info, per-device usage will not be shown, run as root");
} else if (ret) {
return ret;
}
ret = load_device_info(fd, devinfos);
if (ret == -EPERM) {
warning(
"cannot get filesystem info from ioctl(FS_INFO), run as root");
ret = 0;
}
return ret;
}
/*
* This function computes the size of a chunk in a disk
*/
static u64 calc_chunk_size(const struct chunk_info *ci)
{
u32 div = 1;
/*
* The formula doesn't work for RAID1/DUP types, we should just return the
* chunk size
*/
if (!(ci->type & (BTRFS_BLOCK_GROUP_RAID1_MASK|BTRFS_BLOCK_GROUP_DUP))) {
/* No parity + sub_stripes, so order of "-" and "/" does not matter */
div = (ci->num_stripes - btrfs_bg_type_to_nparity(ci->type)) /
btrfs_bg_type_to_sub_stripes(ci->type);
}
return ci->size / div;
}
/*
* This function print the results of the command "btrfs fi usage"
* in tabular format
*/
static void _cmd_filesystem_usage_tabular(unsigned unit_mode,
struct btrfs_ioctl_space_args *sargs,
const struct array *chunkinfos,
const struct array *devinfos)
{
int i;
int devcount = devinfos->length;
u64 total_unused = 0;
u64 total_total = 0;
u64 total_slack = 0;
struct string_table *matrix = NULL;
int ncols, nrows;
int col;
int unallocated_col;
int spaceinfos_col;
int total_col;
int slack_col;
u64 slack;
const int vhdr_skip = 3; /* amount of vertical header space */
/* id, path, unallocated, total, slack */
ncols = 5;
spaceinfos_col = 2;
/* Properly count the real space infos */
for (i = 0; i < sargs->total_spaces; i++) {
if (sargs->spaces[i].flags & BTRFS_SPACE_INFO_GLOBAL_RSV)
continue;
ncols++;
}
/* 2 for header, empty line, devices, ===, total, used */
nrows = vhdr_skip + devcount + 1 + 2;
matrix = table_create(ncols, nrows);
if (!matrix) {
error_msg(ERROR_MSG_MEMORY, NULL);
return;
}
/*
* We have to skip the global block reserve everywhere as it's an
* artificial blockgroup
*/
/* header */
for (i = 0, col = spaceinfos_col; i < sargs->total_spaces; i++) {
u64 flags = sargs->spaces[i].flags;
if (flags & BTRFS_SPACE_INFO_GLOBAL_RSV)
continue;
table_printf(matrix, col, 0, "<%s",
btrfs_group_type_str(flags));
table_printf(matrix, col, 1, "<%s",
btrfs_group_profile_str(flags));
col++;
}
unallocated_col = col++;
total_col = col++;
slack_col = col++;
table_printf(matrix, 0, 1, "<Id");
table_printf(matrix, 1, 1, "<Path");
table_printf(matrix, unallocated_col, 1, "<Unallocated");
table_printf(matrix, total_col, 1, "<Total");
table_printf(matrix, slack_col, 1, "<Slack");
/* body */
for (i = 0; i < devcount; i++) {
int k;
const char *p;
const struct device_info *devinfo = devinfos->data[i];
u64 total_allocated = 0, unused;
p = strrchr(devinfo->path, '/');
if (!p)
p = devinfo->path;
else
p++;
table_printf(matrix, 0, vhdr_skip + i, ">%llu", devinfo->devid);
table_printf(matrix, 1, vhdr_skip + i, "<%s", devinfo->path);
for (col = spaceinfos_col, k = 0; k < sargs->total_spaces; k++) {
u64 flags = sargs->spaces[k].flags;
u64 devid = devinfo->devid;
u64 size = 0;
if (flags & BTRFS_SPACE_INFO_GLOBAL_RSV)
continue;
for (int j = 0; j < chunkinfos->length; j++) {
const struct chunk_info *chunk = chunkinfos->data[j];
if (chunk->type != flags)
continue;
if (chunk->devid != devid)
continue;
size += calc_chunk_size(chunk);
}
if (size)
table_printf(matrix, col, vhdr_skip+ i,
">%s", pretty_size_mode(size, unit_mode));
else
table_printf(matrix, col, vhdr_skip + i, ">-");
total_allocated += size;
col++;