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428c8e0310
The div_factor* helpers calculate fraction or percentage fraction. The name is a bit confusing, we use it only for percentage calculations and there are two helpers. There's a helper mult_frac that's for general fractions, that tries to be accurate but we multiply and divide by small numbers so we can use the div_u64 helper. Rename the div_factor* helpers and use 1..100 percentage range, also drop the case checking for percentage == 100, it's never hit. The conversions: * div_factor calculates tenths and the numbers need to be adjusted * div_factor_fine is direct replacement Signed-off-by: David Sterba <dsterba@suse.com>
2353 lines
62 KiB
C
2353 lines
62 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*/
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#include <linux/sched.h>
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#include <linux/sched/mm.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/bug.h>
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#include <crypto/hash.h>
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#include "messages.h"
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#include "ctree.h"
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#include "discard.h"
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#include "disk-io.h"
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#include "send.h"
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#include "transaction.h"
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#include "sysfs.h"
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#include "volumes.h"
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#include "space-info.h"
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#include "block-group.h"
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#include "qgroup.h"
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#include "misc.h"
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#include "fs.h"
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#include "accessors.h"
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/*
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* Structure name Path
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* --------------------------------------------------------------------------
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* btrfs_supported_static_feature_attrs /sys/fs/btrfs/features
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* btrfs_supported_feature_attrs /sys/fs/btrfs/features and
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* /sys/fs/btrfs/<uuid>/features
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* btrfs_attrs /sys/fs/btrfs/<uuid>
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* devid_attrs /sys/fs/btrfs/<uuid>/devinfo/<devid>
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* allocation_attrs /sys/fs/btrfs/<uuid>/allocation
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* qgroup_attrs /sys/fs/btrfs/<uuid>/qgroups/<level>_<qgroupid>
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* space_info_attrs /sys/fs/btrfs/<uuid>/allocation/<bg-type>
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* raid_attrs /sys/fs/btrfs/<uuid>/allocation/<bg-type>/<bg-profile>
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* discard_attrs /sys/fs/btrfs/<uuid>/discard
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*
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* When built with BTRFS_CONFIG_DEBUG:
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*
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* btrfs_debug_feature_attrs /sys/fs/btrfs/debug
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* btrfs_debug_mount_attrs /sys/fs/btrfs/<uuid>/debug
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*/
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struct btrfs_feature_attr {
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struct kobj_attribute kobj_attr;
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enum btrfs_feature_set feature_set;
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u64 feature_bit;
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};
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/* For raid type sysfs entries */
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struct raid_kobject {
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u64 flags;
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struct kobject kobj;
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};
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#define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \
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{ \
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.attr = { .name = __stringify(_name), .mode = _mode }, \
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.show = _show, \
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.store = _store, \
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}
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#define BTRFS_ATTR_W(_prefix, _name, _store) \
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static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \
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__INIT_KOBJ_ATTR(_name, 0200, NULL, _store)
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#define BTRFS_ATTR_RW(_prefix, _name, _show, _store) \
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static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \
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__INIT_KOBJ_ATTR(_name, 0644, _show, _store)
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#define BTRFS_ATTR(_prefix, _name, _show) \
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static struct kobj_attribute btrfs_attr_##_prefix##_##_name = \
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__INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
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#define BTRFS_ATTR_PTR(_prefix, _name) \
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(&btrfs_attr_##_prefix##_##_name.attr)
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#define BTRFS_FEAT_ATTR(_name, _feature_set, _feature_prefix, _feature_bit) \
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static struct btrfs_feature_attr btrfs_attr_features_##_name = { \
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.kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \
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btrfs_feature_attr_show, \
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btrfs_feature_attr_store), \
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.feature_set = _feature_set, \
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.feature_bit = _feature_prefix ##_## _feature_bit, \
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}
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#define BTRFS_FEAT_ATTR_PTR(_name) \
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(&btrfs_attr_features_##_name.kobj_attr.attr)
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#define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
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BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
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#define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
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BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT_RO, feature)
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#define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
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BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
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static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
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static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj);
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static struct kobject *get_btrfs_kobj(struct kobject *kobj);
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static struct btrfs_feature_attr *to_btrfs_feature_attr(struct kobj_attribute *a)
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{
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return container_of(a, struct btrfs_feature_attr, kobj_attr);
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}
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static struct kobj_attribute *attr_to_btrfs_attr(struct attribute *attr)
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{
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return container_of(attr, struct kobj_attribute, attr);
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}
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static struct btrfs_feature_attr *attr_to_btrfs_feature_attr(
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struct attribute *attr)
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{
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return to_btrfs_feature_attr(attr_to_btrfs_attr(attr));
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}
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static u64 get_features(struct btrfs_fs_info *fs_info,
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enum btrfs_feature_set set)
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{
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struct btrfs_super_block *disk_super = fs_info->super_copy;
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if (set == FEAT_COMPAT)
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return btrfs_super_compat_flags(disk_super);
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else if (set == FEAT_COMPAT_RO)
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return btrfs_super_compat_ro_flags(disk_super);
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else
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return btrfs_super_incompat_flags(disk_super);
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}
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static void set_features(struct btrfs_fs_info *fs_info,
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enum btrfs_feature_set set, u64 features)
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{
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struct btrfs_super_block *disk_super = fs_info->super_copy;
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if (set == FEAT_COMPAT)
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btrfs_set_super_compat_flags(disk_super, features);
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else if (set == FEAT_COMPAT_RO)
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btrfs_set_super_compat_ro_flags(disk_super, features);
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else
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btrfs_set_super_incompat_flags(disk_super, features);
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}
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static int can_modify_feature(struct btrfs_feature_attr *fa)
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{
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int val = 0;
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u64 set, clear;
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switch (fa->feature_set) {
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case FEAT_COMPAT:
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set = BTRFS_FEATURE_COMPAT_SAFE_SET;
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clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
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break;
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case FEAT_COMPAT_RO:
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set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
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clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
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break;
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case FEAT_INCOMPAT:
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set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
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clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
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break;
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default:
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pr_warn("btrfs: sysfs: unknown feature set %d\n",
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fa->feature_set);
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return 0;
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}
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if (set & fa->feature_bit)
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val |= 1;
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if (clear & fa->feature_bit)
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val |= 2;
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return val;
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}
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static ssize_t btrfs_feature_attr_show(struct kobject *kobj,
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struct kobj_attribute *a, char *buf)
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{
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int val = 0;
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struct btrfs_fs_info *fs_info = to_fs_info(kobj);
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struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
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if (fs_info) {
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u64 features = get_features(fs_info, fa->feature_set);
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if (features & fa->feature_bit)
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val = 1;
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} else
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val = can_modify_feature(fa);
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return sysfs_emit(buf, "%d\n", val);
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}
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static ssize_t btrfs_feature_attr_store(struct kobject *kobj,
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struct kobj_attribute *a,
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const char *buf, size_t count)
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{
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struct btrfs_fs_info *fs_info;
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struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
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u64 features, set, clear;
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unsigned long val;
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int ret;
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fs_info = to_fs_info(kobj);
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if (!fs_info)
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return -EPERM;
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if (sb_rdonly(fs_info->sb))
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return -EROFS;
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ret = kstrtoul(skip_spaces(buf), 0, &val);
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if (ret)
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return ret;
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if (fa->feature_set == FEAT_COMPAT) {
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set = BTRFS_FEATURE_COMPAT_SAFE_SET;
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clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
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} else if (fa->feature_set == FEAT_COMPAT_RO) {
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set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
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clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
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} else {
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set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
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clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
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}
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features = get_features(fs_info, fa->feature_set);
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/* Nothing to do */
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if ((val && (features & fa->feature_bit)) ||
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(!val && !(features & fa->feature_bit)))
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return count;
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if ((val && !(set & fa->feature_bit)) ||
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(!val && !(clear & fa->feature_bit))) {
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btrfs_info(fs_info,
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"%sabling feature %s on mounted fs is not supported.",
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val ? "En" : "Dis", fa->kobj_attr.attr.name);
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return -EPERM;
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}
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btrfs_info(fs_info, "%s %s feature flag",
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val ? "Setting" : "Clearing", fa->kobj_attr.attr.name);
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spin_lock(&fs_info->super_lock);
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features = get_features(fs_info, fa->feature_set);
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if (val)
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features |= fa->feature_bit;
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else
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features &= ~fa->feature_bit;
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set_features(fs_info, fa->feature_set, features);
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spin_unlock(&fs_info->super_lock);
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/*
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* We don't want to do full transaction commit from inside sysfs
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*/
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set_bit(BTRFS_FS_NEED_TRANS_COMMIT, &fs_info->flags);
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wake_up_process(fs_info->transaction_kthread);
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return count;
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}
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static umode_t btrfs_feature_visible(struct kobject *kobj,
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struct attribute *attr, int unused)
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{
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struct btrfs_fs_info *fs_info = to_fs_info(kobj);
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umode_t mode = attr->mode;
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if (fs_info) {
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struct btrfs_feature_attr *fa;
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u64 features;
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fa = attr_to_btrfs_feature_attr(attr);
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features = get_features(fs_info, fa->feature_set);
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if (can_modify_feature(fa))
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mode |= S_IWUSR;
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else if (!(features & fa->feature_bit))
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mode = 0;
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}
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return mode;
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}
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BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
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BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
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BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);
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BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD);
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BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
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BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
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BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
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BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
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BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID);
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BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE);
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BTRFS_FEAT_ATTR_COMPAT_RO(block_group_tree, BLOCK_GROUP_TREE);
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BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34);
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#ifdef CONFIG_BLK_DEV_ZONED
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BTRFS_FEAT_ATTR_INCOMPAT(zoned, ZONED);
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#endif
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#ifdef CONFIG_BTRFS_DEBUG
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/* Remove once support for extent tree v2 is feature complete */
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BTRFS_FEAT_ATTR_INCOMPAT(extent_tree_v2, EXTENT_TREE_V2);
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#endif
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#ifdef CONFIG_FS_VERITY
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BTRFS_FEAT_ATTR_COMPAT_RO(verity, VERITY);
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#endif
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/*
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* Features which depend on feature bits and may differ between each fs.
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*
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* /sys/fs/btrfs/features - all available features implemented by this version
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* /sys/fs/btrfs/UUID/features - features of the fs which are enabled or
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* can be changed on a mounted filesystem.
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*/
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static struct attribute *btrfs_supported_feature_attrs[] = {
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BTRFS_FEAT_ATTR_PTR(default_subvol),
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BTRFS_FEAT_ATTR_PTR(mixed_groups),
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BTRFS_FEAT_ATTR_PTR(compress_lzo),
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BTRFS_FEAT_ATTR_PTR(compress_zstd),
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BTRFS_FEAT_ATTR_PTR(extended_iref),
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BTRFS_FEAT_ATTR_PTR(raid56),
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BTRFS_FEAT_ATTR_PTR(skinny_metadata),
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BTRFS_FEAT_ATTR_PTR(no_holes),
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BTRFS_FEAT_ATTR_PTR(metadata_uuid),
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BTRFS_FEAT_ATTR_PTR(free_space_tree),
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BTRFS_FEAT_ATTR_PTR(raid1c34),
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BTRFS_FEAT_ATTR_PTR(block_group_tree),
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#ifdef CONFIG_BLK_DEV_ZONED
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BTRFS_FEAT_ATTR_PTR(zoned),
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#endif
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#ifdef CONFIG_BTRFS_DEBUG
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BTRFS_FEAT_ATTR_PTR(extent_tree_v2),
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#endif
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#ifdef CONFIG_FS_VERITY
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BTRFS_FEAT_ATTR_PTR(verity),
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#endif
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NULL
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};
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static const struct attribute_group btrfs_feature_attr_group = {
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.name = "features",
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.is_visible = btrfs_feature_visible,
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.attrs = btrfs_supported_feature_attrs,
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};
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static ssize_t rmdir_subvol_show(struct kobject *kobj,
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struct kobj_attribute *ka, char *buf)
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{
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return sysfs_emit(buf, "0\n");
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}
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BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show);
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static ssize_t supported_checksums_show(struct kobject *kobj,
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struct kobj_attribute *a, char *buf)
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{
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ssize_t ret = 0;
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int i;
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for (i = 0; i < btrfs_get_num_csums(); i++) {
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/*
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* This "trick" only works as long as 'enum btrfs_csum_type' has
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* no holes in it
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*/
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ret += sysfs_emit_at(buf, ret, "%s%s", (i == 0 ? "" : " "),
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btrfs_super_csum_name(i));
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}
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ret += sysfs_emit_at(buf, ret, "\n");
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return ret;
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}
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BTRFS_ATTR(static_feature, supported_checksums, supported_checksums_show);
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static ssize_t send_stream_version_show(struct kobject *kobj,
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struct kobj_attribute *ka, char *buf)
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{
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return sysfs_emit(buf, "%d\n", BTRFS_SEND_STREAM_VERSION);
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}
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BTRFS_ATTR(static_feature, send_stream_version, send_stream_version_show);
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static const char *rescue_opts[] = {
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"usebackuproot",
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"nologreplay",
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"ignorebadroots",
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"ignoredatacsums",
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"all",
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};
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static ssize_t supported_rescue_options_show(struct kobject *kobj,
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struct kobj_attribute *a,
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char *buf)
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{
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ssize_t ret = 0;
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int i;
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for (i = 0; i < ARRAY_SIZE(rescue_opts); i++)
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ret += sysfs_emit_at(buf, ret, "%s%s", (i ? " " : ""), rescue_opts[i]);
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ret += sysfs_emit_at(buf, ret, "\n");
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return ret;
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}
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BTRFS_ATTR(static_feature, supported_rescue_options,
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supported_rescue_options_show);
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static ssize_t supported_sectorsizes_show(struct kobject *kobj,
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struct kobj_attribute *a,
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char *buf)
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{
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ssize_t ret = 0;
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/* An artificial limit to only support 4K and PAGE_SIZE */
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if (PAGE_SIZE > SZ_4K)
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ret += sysfs_emit_at(buf, ret, "%u ", SZ_4K);
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ret += sysfs_emit_at(buf, ret, "%lu\n", PAGE_SIZE);
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return ret;
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}
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BTRFS_ATTR(static_feature, supported_sectorsizes,
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supported_sectorsizes_show);
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/*
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* Features which only depend on kernel version.
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*
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* These are listed in /sys/fs/btrfs/features along with
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* btrfs_supported_feature_attrs.
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*/
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static struct attribute *btrfs_supported_static_feature_attrs[] = {
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BTRFS_ATTR_PTR(static_feature, rmdir_subvol),
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BTRFS_ATTR_PTR(static_feature, supported_checksums),
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BTRFS_ATTR_PTR(static_feature, send_stream_version),
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BTRFS_ATTR_PTR(static_feature, supported_rescue_options),
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BTRFS_ATTR_PTR(static_feature, supported_sectorsizes),
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NULL
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};
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static const struct attribute_group btrfs_static_feature_attr_group = {
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.name = "features",
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.attrs = btrfs_supported_static_feature_attrs,
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};
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/*
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* Discard statistics and tunables
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*/
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#define discard_to_fs_info(_kobj) to_fs_info(get_btrfs_kobj(_kobj))
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static ssize_t btrfs_discardable_bytes_show(struct kobject *kobj,
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struct kobj_attribute *a,
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char *buf)
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|
{
|
|
struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
|
|
|
|
return sysfs_emit(buf, "%lld\n",
|
|
atomic64_read(&fs_info->discard_ctl.discardable_bytes));
|
|
}
|
|
BTRFS_ATTR(discard, discardable_bytes, btrfs_discardable_bytes_show);
|
|
|
|
static ssize_t btrfs_discardable_extents_show(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
|
|
|
|
return sysfs_emit(buf, "%d\n",
|
|
atomic_read(&fs_info->discard_ctl.discardable_extents));
|
|
}
|
|
BTRFS_ATTR(discard, discardable_extents, btrfs_discardable_extents_show);
|
|
|
|
static ssize_t btrfs_discard_bitmap_bytes_show(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
|
|
|
|
return sysfs_emit(buf, "%llu\n",
|
|
fs_info->discard_ctl.discard_bitmap_bytes);
|
|
}
|
|
BTRFS_ATTR(discard, discard_bitmap_bytes, btrfs_discard_bitmap_bytes_show);
|
|
|
|
static ssize_t btrfs_discard_bytes_saved_show(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
|
|
|
|
return sysfs_emit(buf, "%lld\n",
|
|
atomic64_read(&fs_info->discard_ctl.discard_bytes_saved));
|
|
}
|
|
BTRFS_ATTR(discard, discard_bytes_saved, btrfs_discard_bytes_saved_show);
|
|
|
|
static ssize_t btrfs_discard_extent_bytes_show(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
|
|
|
|
return sysfs_emit(buf, "%llu\n",
|
|
fs_info->discard_ctl.discard_extent_bytes);
|
|
}
|
|
BTRFS_ATTR(discard, discard_extent_bytes, btrfs_discard_extent_bytes_show);
|
|
|
|
static ssize_t btrfs_discard_iops_limit_show(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
|
|
|
|
return sysfs_emit(buf, "%u\n",
|
|
READ_ONCE(fs_info->discard_ctl.iops_limit));
|
|
}
|
|
|
|
static ssize_t btrfs_discard_iops_limit_store(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
|
|
struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
|
|
u32 iops_limit;
|
|
int ret;
|
|
|
|
ret = kstrtou32(buf, 10, &iops_limit);
|
|
if (ret)
|
|
return -EINVAL;
|
|
|
|
WRITE_ONCE(discard_ctl->iops_limit, iops_limit);
|
|
btrfs_discard_calc_delay(discard_ctl);
|
|
btrfs_discard_schedule_work(discard_ctl, true);
|
|
return len;
|
|
}
|
|
BTRFS_ATTR_RW(discard, iops_limit, btrfs_discard_iops_limit_show,
|
|
btrfs_discard_iops_limit_store);
|
|
|
|
static ssize_t btrfs_discard_kbps_limit_show(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
|
|
|
|
return sysfs_emit(buf, "%u\n",
|
|
READ_ONCE(fs_info->discard_ctl.kbps_limit));
|
|
}
|
|
|
|
static ssize_t btrfs_discard_kbps_limit_store(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
|
|
struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
|
|
u32 kbps_limit;
|
|
int ret;
|
|
|
|
ret = kstrtou32(buf, 10, &kbps_limit);
|
|
if (ret)
|
|
return -EINVAL;
|
|
|
|
WRITE_ONCE(discard_ctl->kbps_limit, kbps_limit);
|
|
btrfs_discard_schedule_work(discard_ctl, true);
|
|
return len;
|
|
}
|
|
BTRFS_ATTR_RW(discard, kbps_limit, btrfs_discard_kbps_limit_show,
|
|
btrfs_discard_kbps_limit_store);
|
|
|
|
static ssize_t btrfs_discard_max_discard_size_show(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
|
|
|
|
return sysfs_emit(buf, "%llu\n",
|
|
READ_ONCE(fs_info->discard_ctl.max_discard_size));
|
|
}
|
|
|
|
static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = discard_to_fs_info(kobj);
|
|
struct btrfs_discard_ctl *discard_ctl = &fs_info->discard_ctl;
|
|
u64 max_discard_size;
|
|
int ret;
|
|
|
|
ret = kstrtou64(buf, 10, &max_discard_size);
|
|
if (ret)
|
|
return -EINVAL;
|
|
|
|
WRITE_ONCE(discard_ctl->max_discard_size, max_discard_size);
|
|
|
|
return len;
|
|
}
|
|
BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show,
|
|
btrfs_discard_max_discard_size_store);
|
|
|
|
/*
|
|
* Per-filesystem stats for discard (when mounted with discard=async).
|
|
*
|
|
* Path: /sys/fs/btrfs/<uuid>/discard/
|
|
*/
|
|
static const struct attribute *discard_attrs[] = {
|
|
BTRFS_ATTR_PTR(discard, discardable_bytes),
|
|
BTRFS_ATTR_PTR(discard, discardable_extents),
|
|
BTRFS_ATTR_PTR(discard, discard_bitmap_bytes),
|
|
BTRFS_ATTR_PTR(discard, discard_bytes_saved),
|
|
BTRFS_ATTR_PTR(discard, discard_extent_bytes),
|
|
BTRFS_ATTR_PTR(discard, iops_limit),
|
|
BTRFS_ATTR_PTR(discard, kbps_limit),
|
|
BTRFS_ATTR_PTR(discard, max_discard_size),
|
|
NULL,
|
|
};
|
|
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
|
|
/*
|
|
* Per-filesystem runtime debugging exported via sysfs.
|
|
*
|
|
* Path: /sys/fs/btrfs/UUID/debug/
|
|
*/
|
|
static const struct attribute *btrfs_debug_mount_attrs[] = {
|
|
NULL,
|
|
};
|
|
|
|
/*
|
|
* Runtime debugging exported via sysfs, applies to all mounted filesystems.
|
|
*
|
|
* Path: /sys/fs/btrfs/debug
|
|
*/
|
|
static struct attribute *btrfs_debug_feature_attrs[] = {
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group btrfs_debug_feature_attr_group = {
|
|
.name = "debug",
|
|
.attrs = btrfs_debug_feature_attrs,
|
|
};
|
|
|
|
#endif
|
|
|
|
static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf)
|
|
{
|
|
u64 val;
|
|
if (lock)
|
|
spin_lock(lock);
|
|
val = *value_ptr;
|
|
if (lock)
|
|
spin_unlock(lock);
|
|
return sysfs_emit(buf, "%llu\n", val);
|
|
}
|
|
|
|
static ssize_t global_rsv_size_show(struct kobject *kobj,
|
|
struct kobj_attribute *ka, char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
|
|
struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
|
|
return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf);
|
|
}
|
|
BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show);
|
|
|
|
static ssize_t global_rsv_reserved_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
|
|
struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
|
|
return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf);
|
|
}
|
|
BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show);
|
|
|
|
#define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
|
|
#define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj)
|
|
|
|
static ssize_t raid_bytes_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf);
|
|
BTRFS_ATTR(raid, total_bytes, raid_bytes_show);
|
|
BTRFS_ATTR(raid, used_bytes, raid_bytes_show);
|
|
|
|
static ssize_t raid_bytes_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf)
|
|
|
|
{
|
|
struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
|
|
struct btrfs_block_group *block_group;
|
|
int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags);
|
|
u64 val = 0;
|
|
|
|
down_read(&sinfo->groups_sem);
|
|
list_for_each_entry(block_group, &sinfo->block_groups[index], list) {
|
|
if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes))
|
|
val += block_group->length;
|
|
else
|
|
val += block_group->used;
|
|
}
|
|
up_read(&sinfo->groups_sem);
|
|
return sysfs_emit(buf, "%llu\n", val);
|
|
}
|
|
|
|
/*
|
|
* Allocation information about block group profiles.
|
|
*
|
|
* Path: /sys/fs/btrfs/<uuid>/allocation/<bg-type>/<bg-profile>/
|
|
*/
|
|
static struct attribute *raid_attrs[] = {
|
|
BTRFS_ATTR_PTR(raid, total_bytes),
|
|
BTRFS_ATTR_PTR(raid, used_bytes),
|
|
NULL
|
|
};
|
|
ATTRIBUTE_GROUPS(raid);
|
|
|
|
static void release_raid_kobj(struct kobject *kobj)
|
|
{
|
|
kfree(to_raid_kobj(kobj));
|
|
}
|
|
|
|
static struct kobj_type btrfs_raid_ktype = {
|
|
.sysfs_ops = &kobj_sysfs_ops,
|
|
.release = release_raid_kobj,
|
|
.default_groups = raid_groups,
|
|
};
|
|
|
|
#define SPACE_INFO_ATTR(field) \
|
|
static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \
|
|
struct kobj_attribute *a, \
|
|
char *buf) \
|
|
{ \
|
|
struct btrfs_space_info *sinfo = to_space_info(kobj); \
|
|
return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
|
|
} \
|
|
BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field)
|
|
|
|
static ssize_t btrfs_chunk_size_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
struct btrfs_space_info *sinfo = to_space_info(kobj);
|
|
|
|
return sysfs_emit(buf, "%llu\n", READ_ONCE(sinfo->chunk_size));
|
|
}
|
|
|
|
/*
|
|
* Store new chunk size in space info. Can be called on a read-only filesystem.
|
|
*
|
|
* If the new chunk size value is larger than 10% of free space it is reduced
|
|
* to match that limit. Alignment must be to 256M and the system chunk size
|
|
* cannot be set.
|
|
*/
|
|
static ssize_t btrfs_chunk_size_store(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct btrfs_space_info *space_info = to_space_info(kobj);
|
|
struct btrfs_fs_info *fs_info = to_fs_info(get_btrfs_kobj(kobj));
|
|
char *retptr;
|
|
u64 val;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (!fs_info->fs_devices)
|
|
return -EINVAL;
|
|
|
|
if (btrfs_is_zoned(fs_info))
|
|
return -EINVAL;
|
|
|
|
/* System block type must not be changed. */
|
|
if (space_info->flags & BTRFS_BLOCK_GROUP_SYSTEM)
|
|
return -EPERM;
|
|
|
|
val = memparse(buf, &retptr);
|
|
/* There could be trailing '\n', also catch any typos after the value */
|
|
retptr = skip_spaces(retptr);
|
|
if (*retptr != 0 || val == 0)
|
|
return -EINVAL;
|
|
|
|
val = min(val, BTRFS_MAX_DATA_CHUNK_SIZE);
|
|
|
|
/* Limit stripe size to 10% of available space. */
|
|
val = min(mult_perc(fs_info->fs_devices->total_rw_bytes, 10), val);
|
|
|
|
/* Must be multiple of 256M. */
|
|
val &= ~((u64)SZ_256M - 1);
|
|
|
|
/* Must be at least 256M. */
|
|
if (val < SZ_256M)
|
|
return -EINVAL;
|
|
|
|
btrfs_update_space_info_chunk_size(space_info, val);
|
|
|
|
return len;
|
|
}
|
|
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
/*
|
|
* Request chunk allocation with current chunk size.
|
|
*/
|
|
static ssize_t btrfs_force_chunk_alloc_store(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct btrfs_space_info *space_info = to_space_info(kobj);
|
|
struct btrfs_fs_info *fs_info = to_fs_info(get_btrfs_kobj(kobj));
|
|
struct btrfs_trans_handle *trans;
|
|
bool val;
|
|
int ret;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (sb_rdonly(fs_info->sb))
|
|
return -EROFS;
|
|
|
|
ret = kstrtobool(buf, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!val)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* This is unsafe to be called from sysfs context and may cause
|
|
* unexpected problems.
|
|
*/
|
|
trans = btrfs_start_transaction(fs_info->tree_root, 0);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
ret = btrfs_force_chunk_alloc(trans, space_info->flags);
|
|
btrfs_end_transaction(trans);
|
|
|
|
if (ret == 1)
|
|
return len;
|
|
|
|
return -ENOSPC;
|
|
}
|
|
BTRFS_ATTR_W(space_info, force_chunk_alloc, btrfs_force_chunk_alloc_store);
|
|
|
|
#endif
|
|
|
|
SPACE_INFO_ATTR(flags);
|
|
SPACE_INFO_ATTR(total_bytes);
|
|
SPACE_INFO_ATTR(bytes_used);
|
|
SPACE_INFO_ATTR(bytes_pinned);
|
|
SPACE_INFO_ATTR(bytes_reserved);
|
|
SPACE_INFO_ATTR(bytes_may_use);
|
|
SPACE_INFO_ATTR(bytes_readonly);
|
|
SPACE_INFO_ATTR(bytes_zone_unusable);
|
|
SPACE_INFO_ATTR(disk_used);
|
|
SPACE_INFO_ATTR(disk_total);
|
|
BTRFS_ATTR_RW(space_info, chunk_size, btrfs_chunk_size_show, btrfs_chunk_size_store);
|
|
|
|
static ssize_t btrfs_sinfo_bg_reclaim_threshold_show(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct btrfs_space_info *space_info = to_space_info(kobj);
|
|
|
|
return sysfs_emit(buf, "%d\n", READ_ONCE(space_info->bg_reclaim_threshold));
|
|
}
|
|
|
|
static ssize_t btrfs_sinfo_bg_reclaim_threshold_store(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct btrfs_space_info *space_info = to_space_info(kobj);
|
|
int thresh;
|
|
int ret;
|
|
|
|
ret = kstrtoint(buf, 10, &thresh);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (thresh < 0 || thresh > 100)
|
|
return -EINVAL;
|
|
|
|
WRITE_ONCE(space_info->bg_reclaim_threshold, thresh);
|
|
|
|
return len;
|
|
}
|
|
|
|
BTRFS_ATTR_RW(space_info, bg_reclaim_threshold,
|
|
btrfs_sinfo_bg_reclaim_threshold_show,
|
|
btrfs_sinfo_bg_reclaim_threshold_store);
|
|
|
|
/*
|
|
* Allocation information about block group types.
|
|
*
|
|
* Path: /sys/fs/btrfs/<uuid>/allocation/<bg-type>/
|
|
*/
|
|
static struct attribute *space_info_attrs[] = {
|
|
BTRFS_ATTR_PTR(space_info, flags),
|
|
BTRFS_ATTR_PTR(space_info, total_bytes),
|
|
BTRFS_ATTR_PTR(space_info, bytes_used),
|
|
BTRFS_ATTR_PTR(space_info, bytes_pinned),
|
|
BTRFS_ATTR_PTR(space_info, bytes_reserved),
|
|
BTRFS_ATTR_PTR(space_info, bytes_may_use),
|
|
BTRFS_ATTR_PTR(space_info, bytes_readonly),
|
|
BTRFS_ATTR_PTR(space_info, bytes_zone_unusable),
|
|
BTRFS_ATTR_PTR(space_info, disk_used),
|
|
BTRFS_ATTR_PTR(space_info, disk_total),
|
|
BTRFS_ATTR_PTR(space_info, bg_reclaim_threshold),
|
|
BTRFS_ATTR_PTR(space_info, chunk_size),
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
BTRFS_ATTR_PTR(space_info, force_chunk_alloc),
|
|
#endif
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(space_info);
|
|
|
|
static void space_info_release(struct kobject *kobj)
|
|
{
|
|
struct btrfs_space_info *sinfo = to_space_info(kobj);
|
|
kfree(sinfo);
|
|
}
|
|
|
|
static struct kobj_type space_info_ktype = {
|
|
.sysfs_ops = &kobj_sysfs_ops,
|
|
.release = space_info_release,
|
|
.default_groups = space_info_groups,
|
|
};
|
|
|
|
/*
|
|
* Allocation information about block groups.
|
|
*
|
|
* Path: /sys/fs/btrfs/<uuid>/allocation/
|
|
*/
|
|
static const struct attribute *allocation_attrs[] = {
|
|
BTRFS_ATTR_PTR(allocation, global_rsv_reserved),
|
|
BTRFS_ATTR_PTR(allocation, global_rsv_size),
|
|
NULL,
|
|
};
|
|
|
|
static ssize_t btrfs_label_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
|
|
char *label = fs_info->super_copy->label;
|
|
ssize_t ret;
|
|
|
|
spin_lock(&fs_info->super_lock);
|
|
ret = sysfs_emit(buf, label[0] ? "%s\n" : "%s", label);
|
|
spin_unlock(&fs_info->super_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t btrfs_label_store(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
|
|
size_t p_len;
|
|
|
|
if (!fs_info)
|
|
return -EPERM;
|
|
|
|
if (sb_rdonly(fs_info->sb))
|
|
return -EROFS;
|
|
|
|
/*
|
|
* p_len is the len until the first occurrence of either
|
|
* '\n' or '\0'
|
|
*/
|
|
p_len = strcspn(buf, "\n");
|
|
|
|
if (p_len >= BTRFS_LABEL_SIZE)
|
|
return -EINVAL;
|
|
|
|
spin_lock(&fs_info->super_lock);
|
|
memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
|
|
memcpy(fs_info->super_copy->label, buf, p_len);
|
|
spin_unlock(&fs_info->super_lock);
|
|
|
|
/*
|
|
* We don't want to do full transaction commit from inside sysfs
|
|
*/
|
|
set_bit(BTRFS_FS_NEED_TRANS_COMMIT, &fs_info->flags);
|
|
wake_up_process(fs_info->transaction_kthread);
|
|
|
|
return len;
|
|
}
|
|
BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store);
|
|
|
|
static ssize_t btrfs_nodesize_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
|
|
|
|
return sysfs_emit(buf, "%u\n", fs_info->super_copy->nodesize);
|
|
}
|
|
|
|
BTRFS_ATTR(, nodesize, btrfs_nodesize_show);
|
|
|
|
static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
|
|
|
|
return sysfs_emit(buf, "%u\n", fs_info->super_copy->sectorsize);
|
|
}
|
|
|
|
BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show);
|
|
|
|
static ssize_t btrfs_commit_stats_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
|
|
|
|
return sysfs_emit(buf,
|
|
"commits %llu\n"
|
|
"last_commit_ms %llu\n"
|
|
"max_commit_ms %llu\n"
|
|
"total_commit_ms %llu\n",
|
|
fs_info->commit_stats.commit_count,
|
|
div_u64(fs_info->commit_stats.last_commit_dur, NSEC_PER_MSEC),
|
|
div_u64(fs_info->commit_stats.max_commit_dur, NSEC_PER_MSEC),
|
|
div_u64(fs_info->commit_stats.total_commit_dur, NSEC_PER_MSEC));
|
|
}
|
|
|
|
static ssize_t btrfs_commit_stats_store(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
|
|
unsigned long val;
|
|
int ret;
|
|
|
|
if (!fs_info)
|
|
return -EPERM;
|
|
|
|
if (!capable(CAP_SYS_RESOURCE))
|
|
return -EPERM;
|
|
|
|
ret = kstrtoul(buf, 10, &val);
|
|
if (ret)
|
|
return ret;
|
|
if (val)
|
|
return -EINVAL;
|
|
|
|
WRITE_ONCE(fs_info->commit_stats.max_commit_dur, 0);
|
|
|
|
return len;
|
|
}
|
|
BTRFS_ATTR_RW(, commit_stats, btrfs_commit_stats_show, btrfs_commit_stats_store);
|
|
|
|
static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
|
|
|
|
return sysfs_emit(buf, "%u\n", fs_info->super_copy->sectorsize);
|
|
}
|
|
|
|
BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show);
|
|
|
|
static ssize_t quota_override_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
|
|
int quota_override;
|
|
|
|
quota_override = test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
|
|
return sysfs_emit(buf, "%d\n", quota_override);
|
|
}
|
|
|
|
static ssize_t quota_override_store(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
|
|
unsigned long knob;
|
|
int err;
|
|
|
|
if (!fs_info)
|
|
return -EPERM;
|
|
|
|
if (!capable(CAP_SYS_RESOURCE))
|
|
return -EPERM;
|
|
|
|
err = kstrtoul(buf, 10, &knob);
|
|
if (err)
|
|
return err;
|
|
if (knob > 1)
|
|
return -EINVAL;
|
|
|
|
if (knob)
|
|
set_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
|
|
else
|
|
clear_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags);
|
|
|
|
return len;
|
|
}
|
|
|
|
BTRFS_ATTR_RW(, quota_override, quota_override_show, quota_override_store);
|
|
|
|
static ssize_t btrfs_metadata_uuid_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
|
|
|
|
return sysfs_emit(buf, "%pU\n", fs_info->fs_devices->metadata_uuid);
|
|
}
|
|
|
|
BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show);
|
|
|
|
static ssize_t btrfs_checksum_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
|
|
u16 csum_type = btrfs_super_csum_type(fs_info->super_copy);
|
|
|
|
return sysfs_emit(buf, "%s (%s)\n",
|
|
btrfs_super_csum_name(csum_type),
|
|
crypto_shash_driver_name(fs_info->csum_shash));
|
|
}
|
|
|
|
BTRFS_ATTR(, checksum, btrfs_checksum_show);
|
|
|
|
static ssize_t btrfs_exclusive_operation_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
|
|
const char *str;
|
|
|
|
switch (READ_ONCE(fs_info->exclusive_operation)) {
|
|
case BTRFS_EXCLOP_NONE:
|
|
str = "none\n";
|
|
break;
|
|
case BTRFS_EXCLOP_BALANCE:
|
|
str = "balance\n";
|
|
break;
|
|
case BTRFS_EXCLOP_BALANCE_PAUSED:
|
|
str = "balance paused\n";
|
|
break;
|
|
case BTRFS_EXCLOP_DEV_ADD:
|
|
str = "device add\n";
|
|
break;
|
|
case BTRFS_EXCLOP_DEV_REMOVE:
|
|
str = "device remove\n";
|
|
break;
|
|
case BTRFS_EXCLOP_DEV_REPLACE:
|
|
str = "device replace\n";
|
|
break;
|
|
case BTRFS_EXCLOP_RESIZE:
|
|
str = "resize\n";
|
|
break;
|
|
case BTRFS_EXCLOP_SWAP_ACTIVATE:
|
|
str = "swap activate\n";
|
|
break;
|
|
default:
|
|
str = "UNKNOWN\n";
|
|
break;
|
|
}
|
|
return sysfs_emit(buf, "%s", str);
|
|
}
|
|
BTRFS_ATTR(, exclusive_operation, btrfs_exclusive_operation_show);
|
|
|
|
static ssize_t btrfs_generation_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
|
|
|
|
return sysfs_emit(buf, "%llu\n", fs_info->generation);
|
|
}
|
|
BTRFS_ATTR(, generation, btrfs_generation_show);
|
|
|
|
static const char * const btrfs_read_policy_name[] = { "pid" };
|
|
|
|
static ssize_t btrfs_read_policy_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj);
|
|
ssize_t ret = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < BTRFS_NR_READ_POLICY; i++) {
|
|
if (fs_devices->read_policy == i)
|
|
ret += sysfs_emit_at(buf, ret, "%s[%s]",
|
|
(ret == 0 ? "" : " "),
|
|
btrfs_read_policy_name[i]);
|
|
else
|
|
ret += sysfs_emit_at(buf, ret, "%s%s",
|
|
(ret == 0 ? "" : " "),
|
|
btrfs_read_policy_name[i]);
|
|
}
|
|
|
|
ret += sysfs_emit_at(buf, ret, "\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t btrfs_read_policy_store(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct btrfs_fs_devices *fs_devices = to_fs_devs(kobj);
|
|
int i;
|
|
|
|
for (i = 0; i < BTRFS_NR_READ_POLICY; i++) {
|
|
if (sysfs_streq(buf, btrfs_read_policy_name[i])) {
|
|
if (i != fs_devices->read_policy) {
|
|
fs_devices->read_policy = i;
|
|
btrfs_info(fs_devices->fs_info,
|
|
"read policy set to '%s'",
|
|
btrfs_read_policy_name[i]);
|
|
}
|
|
return len;
|
|
}
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
BTRFS_ATTR_RW(, read_policy, btrfs_read_policy_show, btrfs_read_policy_store);
|
|
|
|
static ssize_t btrfs_bg_reclaim_threshold_show(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
|
|
|
|
return sysfs_emit(buf, "%d\n", READ_ONCE(fs_info->bg_reclaim_threshold));
|
|
}
|
|
|
|
static ssize_t btrfs_bg_reclaim_threshold_store(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
|
|
int thresh;
|
|
int ret;
|
|
|
|
ret = kstrtoint(buf, 10, &thresh);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (thresh != 0 && (thresh <= 50 || thresh > 100))
|
|
return -EINVAL;
|
|
|
|
WRITE_ONCE(fs_info->bg_reclaim_threshold, thresh);
|
|
|
|
return len;
|
|
}
|
|
BTRFS_ATTR_RW(, bg_reclaim_threshold, btrfs_bg_reclaim_threshold_show,
|
|
btrfs_bg_reclaim_threshold_store);
|
|
|
|
/*
|
|
* Per-filesystem information and stats.
|
|
*
|
|
* Path: /sys/fs/btrfs/<uuid>/
|
|
*/
|
|
static const struct attribute *btrfs_attrs[] = {
|
|
BTRFS_ATTR_PTR(, label),
|
|
BTRFS_ATTR_PTR(, nodesize),
|
|
BTRFS_ATTR_PTR(, sectorsize),
|
|
BTRFS_ATTR_PTR(, clone_alignment),
|
|
BTRFS_ATTR_PTR(, quota_override),
|
|
BTRFS_ATTR_PTR(, metadata_uuid),
|
|
BTRFS_ATTR_PTR(, checksum),
|
|
BTRFS_ATTR_PTR(, exclusive_operation),
|
|
BTRFS_ATTR_PTR(, generation),
|
|
BTRFS_ATTR_PTR(, read_policy),
|
|
BTRFS_ATTR_PTR(, bg_reclaim_threshold),
|
|
BTRFS_ATTR_PTR(, commit_stats),
|
|
NULL,
|
|
};
|
|
|
|
static void btrfs_release_fsid_kobj(struct kobject *kobj)
|
|
{
|
|
struct btrfs_fs_devices *fs_devs = to_fs_devs(kobj);
|
|
|
|
memset(&fs_devs->fsid_kobj, 0, sizeof(struct kobject));
|
|
complete(&fs_devs->kobj_unregister);
|
|
}
|
|
|
|
static struct kobj_type btrfs_ktype = {
|
|
.sysfs_ops = &kobj_sysfs_ops,
|
|
.release = btrfs_release_fsid_kobj,
|
|
};
|
|
|
|
static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj)
|
|
{
|
|
if (kobj->ktype != &btrfs_ktype)
|
|
return NULL;
|
|
return container_of(kobj, struct btrfs_fs_devices, fsid_kobj);
|
|
}
|
|
|
|
static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
|
|
{
|
|
if (kobj->ktype != &btrfs_ktype)
|
|
return NULL;
|
|
return to_fs_devs(kobj)->fs_info;
|
|
}
|
|
|
|
static struct kobject *get_btrfs_kobj(struct kobject *kobj)
|
|
{
|
|
while (kobj) {
|
|
if (kobj->ktype == &btrfs_ktype)
|
|
return kobj;
|
|
kobj = kobj->parent;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
#define NUM_FEATURE_BITS 64
|
|
#define BTRFS_FEATURE_NAME_MAX 13
|
|
static char btrfs_unknown_feature_names[FEAT_MAX][NUM_FEATURE_BITS][BTRFS_FEATURE_NAME_MAX];
|
|
static struct btrfs_feature_attr btrfs_feature_attrs[FEAT_MAX][NUM_FEATURE_BITS];
|
|
|
|
static_assert(ARRAY_SIZE(btrfs_unknown_feature_names) ==
|
|
ARRAY_SIZE(btrfs_feature_attrs));
|
|
static_assert(ARRAY_SIZE(btrfs_unknown_feature_names[0]) ==
|
|
ARRAY_SIZE(btrfs_feature_attrs[0]));
|
|
|
|
static const u64 supported_feature_masks[FEAT_MAX] = {
|
|
[FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP,
|
|
[FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
|
|
[FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP,
|
|
};
|
|
|
|
static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
|
|
{
|
|
int set;
|
|
|
|
for (set = 0; set < FEAT_MAX; set++) {
|
|
int i;
|
|
struct attribute *attrs[2];
|
|
struct attribute_group agroup = {
|
|
.name = "features",
|
|
.attrs = attrs,
|
|
};
|
|
u64 features = get_features(fs_info, set);
|
|
features &= ~supported_feature_masks[set];
|
|
|
|
if (!features)
|
|
continue;
|
|
|
|
attrs[1] = NULL;
|
|
for (i = 0; i < NUM_FEATURE_BITS; i++) {
|
|
struct btrfs_feature_attr *fa;
|
|
|
|
if (!(features & (1ULL << i)))
|
|
continue;
|
|
|
|
fa = &btrfs_feature_attrs[set][i];
|
|
attrs[0] = &fa->kobj_attr.attr;
|
|
if (add) {
|
|
int ret;
|
|
ret = sysfs_merge_group(&fs_info->fs_devices->fsid_kobj,
|
|
&agroup);
|
|
if (ret)
|
|
return ret;
|
|
} else
|
|
sysfs_unmerge_group(&fs_info->fs_devices->fsid_kobj,
|
|
&agroup);
|
|
}
|
|
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
|
|
{
|
|
if (fs_devs->devinfo_kobj) {
|
|
kobject_del(fs_devs->devinfo_kobj);
|
|
kobject_put(fs_devs->devinfo_kobj);
|
|
fs_devs->devinfo_kobj = NULL;
|
|
}
|
|
|
|
if (fs_devs->devices_kobj) {
|
|
kobject_del(fs_devs->devices_kobj);
|
|
kobject_put(fs_devs->devices_kobj);
|
|
fs_devs->devices_kobj = NULL;
|
|
}
|
|
|
|
if (fs_devs->fsid_kobj.state_initialized) {
|
|
kobject_del(&fs_devs->fsid_kobj);
|
|
kobject_put(&fs_devs->fsid_kobj);
|
|
wait_for_completion(&fs_devs->kobj_unregister);
|
|
}
|
|
}
|
|
|
|
/* when fs_devs is NULL it will remove all fsid kobject */
|
|
void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
|
|
{
|
|
struct list_head *fs_uuids = btrfs_get_fs_uuids();
|
|
|
|
if (fs_devs) {
|
|
__btrfs_sysfs_remove_fsid(fs_devs);
|
|
return;
|
|
}
|
|
|
|
list_for_each_entry(fs_devs, fs_uuids, fs_list) {
|
|
__btrfs_sysfs_remove_fsid(fs_devs);
|
|
}
|
|
}
|
|
|
|
static void btrfs_sysfs_remove_fs_devices(struct btrfs_fs_devices *fs_devices)
|
|
{
|
|
struct btrfs_device *device;
|
|
struct btrfs_fs_devices *seed;
|
|
|
|
list_for_each_entry(device, &fs_devices->devices, dev_list)
|
|
btrfs_sysfs_remove_device(device);
|
|
|
|
list_for_each_entry(seed, &fs_devices->seed_list, seed_list) {
|
|
list_for_each_entry(device, &seed->devices, dev_list)
|
|
btrfs_sysfs_remove_device(device);
|
|
}
|
|
}
|
|
|
|
void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj;
|
|
|
|
sysfs_remove_link(fsid_kobj, "bdi");
|
|
|
|
if (fs_info->space_info_kobj) {
|
|
sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs);
|
|
kobject_del(fs_info->space_info_kobj);
|
|
kobject_put(fs_info->space_info_kobj);
|
|
}
|
|
if (fs_info->discard_kobj) {
|
|
sysfs_remove_files(fs_info->discard_kobj, discard_attrs);
|
|
kobject_del(fs_info->discard_kobj);
|
|
kobject_put(fs_info->discard_kobj);
|
|
}
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
if (fs_info->debug_kobj) {
|
|
sysfs_remove_files(fs_info->debug_kobj, btrfs_debug_mount_attrs);
|
|
kobject_del(fs_info->debug_kobj);
|
|
kobject_put(fs_info->debug_kobj);
|
|
}
|
|
#endif
|
|
addrm_unknown_feature_attrs(fs_info, false);
|
|
sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
|
|
sysfs_remove_files(fsid_kobj, btrfs_attrs);
|
|
btrfs_sysfs_remove_fs_devices(fs_info->fs_devices);
|
|
}
|
|
|
|
static const char * const btrfs_feature_set_names[FEAT_MAX] = {
|
|
[FEAT_COMPAT] = "compat",
|
|
[FEAT_COMPAT_RO] = "compat_ro",
|
|
[FEAT_INCOMPAT] = "incompat",
|
|
};
|
|
|
|
const char *btrfs_feature_set_name(enum btrfs_feature_set set)
|
|
{
|
|
return btrfs_feature_set_names[set];
|
|
}
|
|
|
|
char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
|
|
{
|
|
size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
|
|
int len = 0;
|
|
int i;
|
|
char *str;
|
|
|
|
str = kmalloc(bufsize, GFP_KERNEL);
|
|
if (!str)
|
|
return str;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
|
|
const char *name;
|
|
|
|
if (!(flags & (1ULL << i)))
|
|
continue;
|
|
|
|
name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
|
|
len += scnprintf(str + len, bufsize - len, "%s%s",
|
|
len ? "," : "", name);
|
|
}
|
|
|
|
return str;
|
|
}
|
|
|
|
static void init_feature_attrs(void)
|
|
{
|
|
struct btrfs_feature_attr *fa;
|
|
int set, i;
|
|
|
|
memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
|
|
memset(btrfs_unknown_feature_names, 0,
|
|
sizeof(btrfs_unknown_feature_names));
|
|
|
|
for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
|
|
struct btrfs_feature_attr *sfa;
|
|
struct attribute *a = btrfs_supported_feature_attrs[i];
|
|
int bit;
|
|
sfa = attr_to_btrfs_feature_attr(a);
|
|
bit = ilog2(sfa->feature_bit);
|
|
fa = &btrfs_feature_attrs[sfa->feature_set][bit];
|
|
|
|
fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
|
|
}
|
|
|
|
for (set = 0; set < FEAT_MAX; set++) {
|
|
for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
|
|
char *name = btrfs_unknown_feature_names[set][i];
|
|
fa = &btrfs_feature_attrs[set][i];
|
|
|
|
if (fa->kobj_attr.attr.name)
|
|
continue;
|
|
|
|
snprintf(name, BTRFS_FEATURE_NAME_MAX, "%s:%u",
|
|
btrfs_feature_set_names[set], i);
|
|
|
|
fa->kobj_attr.attr.name = name;
|
|
fa->kobj_attr.attr.mode = S_IRUGO;
|
|
fa->feature_set = set;
|
|
fa->feature_bit = 1ULL << i;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create a sysfs entry for a given block group type at path
|
|
* /sys/fs/btrfs/UUID/allocation/data/TYPE
|
|
*/
|
|
void btrfs_sysfs_add_block_group_type(struct btrfs_block_group *cache)
|
|
{
|
|
struct btrfs_fs_info *fs_info = cache->fs_info;
|
|
struct btrfs_space_info *space_info = cache->space_info;
|
|
struct raid_kobject *rkobj;
|
|
const int index = btrfs_bg_flags_to_raid_index(cache->flags);
|
|
unsigned int nofs_flag;
|
|
int ret;
|
|
|
|
/*
|
|
* Setup a NOFS context because kobject_add(), deep in its call chain,
|
|
* does GFP_KERNEL allocations, and we are often called in a context
|
|
* where if reclaim is triggered we can deadlock (we are either holding
|
|
* a transaction handle or some lock required for a transaction
|
|
* commit).
|
|
*/
|
|
nofs_flag = memalloc_nofs_save();
|
|
|
|
rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS);
|
|
if (!rkobj) {
|
|
memalloc_nofs_restore(nofs_flag);
|
|
btrfs_warn(cache->fs_info,
|
|
"couldn't alloc memory for raid level kobject");
|
|
return;
|
|
}
|
|
|
|
rkobj->flags = cache->flags;
|
|
kobject_init(&rkobj->kobj, &btrfs_raid_ktype);
|
|
|
|
/*
|
|
* We call this either on mount, or if we've created a block group for a
|
|
* new index type while running (i.e. when restriping). The running
|
|
* case is tricky because we could race with other threads, so we need
|
|
* to have this check to make sure we didn't already init the kobject.
|
|
*
|
|
* We don't have to protect on the free side because it only happens on
|
|
* unmount.
|
|
*/
|
|
spin_lock(&space_info->lock);
|
|
if (space_info->block_group_kobjs[index]) {
|
|
spin_unlock(&space_info->lock);
|
|
kobject_put(&rkobj->kobj);
|
|
return;
|
|
} else {
|
|
space_info->block_group_kobjs[index] = &rkobj->kobj;
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
|
|
ret = kobject_add(&rkobj->kobj, &space_info->kobj, "%s",
|
|
btrfs_bg_type_to_raid_name(rkobj->flags));
|
|
memalloc_nofs_restore(nofs_flag);
|
|
if (ret) {
|
|
spin_lock(&space_info->lock);
|
|
space_info->block_group_kobjs[index] = NULL;
|
|
spin_unlock(&space_info->lock);
|
|
kobject_put(&rkobj->kobj);
|
|
btrfs_warn(fs_info,
|
|
"failed to add kobject for block cache, ignoring");
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Remove sysfs directories for all block group types of a given space info and
|
|
* the space info as well
|
|
*/
|
|
void btrfs_sysfs_remove_space_info(struct btrfs_space_info *space_info)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
|
|
struct kobject *kobj;
|
|
|
|
kobj = space_info->block_group_kobjs[i];
|
|
space_info->block_group_kobjs[i] = NULL;
|
|
if (kobj) {
|
|
kobject_del(kobj);
|
|
kobject_put(kobj);
|
|
}
|
|
}
|
|
kobject_del(&space_info->kobj);
|
|
kobject_put(&space_info->kobj);
|
|
}
|
|
|
|
static const char *alloc_name(u64 flags)
|
|
{
|
|
switch (flags) {
|
|
case BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA:
|
|
return "mixed";
|
|
case BTRFS_BLOCK_GROUP_METADATA:
|
|
return "metadata";
|
|
case BTRFS_BLOCK_GROUP_DATA:
|
|
return "data";
|
|
case BTRFS_BLOCK_GROUP_SYSTEM:
|
|
return "system";
|
|
default:
|
|
WARN_ON(1);
|
|
return "invalid-combination";
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create a sysfs entry for a space info type at path
|
|
* /sys/fs/btrfs/UUID/allocation/TYPE
|
|
*/
|
|
int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info)
|
|
{
|
|
int ret;
|
|
|
|
ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype,
|
|
fs_info->space_info_kobj, "%s",
|
|
alloc_name(space_info->flags));
|
|
if (ret) {
|
|
kobject_put(&space_info->kobj);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void btrfs_sysfs_remove_device(struct btrfs_device *device)
|
|
{
|
|
struct kobject *devices_kobj;
|
|
|
|
/*
|
|
* Seed fs_devices devices_kobj aren't used, fetch kobject from the
|
|
* fs_info::fs_devices.
|
|
*/
|
|
devices_kobj = device->fs_info->fs_devices->devices_kobj;
|
|
ASSERT(devices_kobj);
|
|
|
|
if (device->bdev)
|
|
sysfs_remove_link(devices_kobj, bdev_kobj(device->bdev)->name);
|
|
|
|
if (device->devid_kobj.state_initialized) {
|
|
kobject_del(&device->devid_kobj);
|
|
kobject_put(&device->devid_kobj);
|
|
wait_for_completion(&device->kobj_unregister);
|
|
}
|
|
}
|
|
|
|
static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
char *buf)
|
|
{
|
|
int val;
|
|
struct btrfs_device *device = container_of(kobj, struct btrfs_device,
|
|
devid_kobj);
|
|
|
|
val = !!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state);
|
|
|
|
return sysfs_emit(buf, "%d\n", val);
|
|
}
|
|
BTRFS_ATTR(devid, in_fs_metadata, btrfs_devinfo_in_fs_metadata_show);
|
|
|
|
static ssize_t btrfs_devinfo_missing_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
int val;
|
|
struct btrfs_device *device = container_of(kobj, struct btrfs_device,
|
|
devid_kobj);
|
|
|
|
val = !!test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state);
|
|
|
|
return sysfs_emit(buf, "%d\n", val);
|
|
}
|
|
BTRFS_ATTR(devid, missing, btrfs_devinfo_missing_show);
|
|
|
|
static ssize_t btrfs_devinfo_replace_target_show(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
char *buf)
|
|
{
|
|
int val;
|
|
struct btrfs_device *device = container_of(kobj, struct btrfs_device,
|
|
devid_kobj);
|
|
|
|
val = !!test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state);
|
|
|
|
return sysfs_emit(buf, "%d\n", val);
|
|
}
|
|
BTRFS_ATTR(devid, replace_target, btrfs_devinfo_replace_target_show);
|
|
|
|
static ssize_t btrfs_devinfo_scrub_speed_max_show(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct btrfs_device *device = container_of(kobj, struct btrfs_device,
|
|
devid_kobj);
|
|
|
|
return sysfs_emit(buf, "%llu\n", READ_ONCE(device->scrub_speed_max));
|
|
}
|
|
|
|
static ssize_t btrfs_devinfo_scrub_speed_max_store(struct kobject *kobj,
|
|
struct kobj_attribute *a,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct btrfs_device *device = container_of(kobj, struct btrfs_device,
|
|
devid_kobj);
|
|
char *endptr;
|
|
unsigned long long limit;
|
|
|
|
limit = memparse(buf, &endptr);
|
|
WRITE_ONCE(device->scrub_speed_max, limit);
|
|
return len;
|
|
}
|
|
BTRFS_ATTR_RW(devid, scrub_speed_max, btrfs_devinfo_scrub_speed_max_show,
|
|
btrfs_devinfo_scrub_speed_max_store);
|
|
|
|
static ssize_t btrfs_devinfo_writeable_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
int val;
|
|
struct btrfs_device *device = container_of(kobj, struct btrfs_device,
|
|
devid_kobj);
|
|
|
|
val = !!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state);
|
|
|
|
return sysfs_emit(buf, "%d\n", val);
|
|
}
|
|
BTRFS_ATTR(devid, writeable, btrfs_devinfo_writeable_show);
|
|
|
|
static ssize_t btrfs_devinfo_fsid_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
struct btrfs_device *device = container_of(kobj, struct btrfs_device,
|
|
devid_kobj);
|
|
|
|
return sysfs_emit(buf, "%pU\n", device->fs_devices->fsid);
|
|
}
|
|
BTRFS_ATTR(devid, fsid, btrfs_devinfo_fsid_show);
|
|
|
|
static ssize_t btrfs_devinfo_error_stats_show(struct kobject *kobj,
|
|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
struct btrfs_device *device = container_of(kobj, struct btrfs_device,
|
|
devid_kobj);
|
|
|
|
if (!device->dev_stats_valid)
|
|
return sysfs_emit(buf, "invalid\n");
|
|
|
|
/*
|
|
* Print all at once so we get a snapshot of all values from the same
|
|
* time. Keep them in sync and in order of definition of
|
|
* btrfs_dev_stat_values.
|
|
*/
|
|
return sysfs_emit(buf,
|
|
"write_errs %d\n"
|
|
"read_errs %d\n"
|
|
"flush_errs %d\n"
|
|
"corruption_errs %d\n"
|
|
"generation_errs %d\n",
|
|
btrfs_dev_stat_read(device, BTRFS_DEV_STAT_WRITE_ERRS),
|
|
btrfs_dev_stat_read(device, BTRFS_DEV_STAT_READ_ERRS),
|
|
btrfs_dev_stat_read(device, BTRFS_DEV_STAT_FLUSH_ERRS),
|
|
btrfs_dev_stat_read(device, BTRFS_DEV_STAT_CORRUPTION_ERRS),
|
|
btrfs_dev_stat_read(device, BTRFS_DEV_STAT_GENERATION_ERRS));
|
|
}
|
|
BTRFS_ATTR(devid, error_stats, btrfs_devinfo_error_stats_show);
|
|
|
|
/*
|
|
* Information about one device.
|
|
*
|
|
* Path: /sys/fs/btrfs/<uuid>/devinfo/<devid>/
|
|
*/
|
|
static struct attribute *devid_attrs[] = {
|
|
BTRFS_ATTR_PTR(devid, error_stats),
|
|
BTRFS_ATTR_PTR(devid, fsid),
|
|
BTRFS_ATTR_PTR(devid, in_fs_metadata),
|
|
BTRFS_ATTR_PTR(devid, missing),
|
|
BTRFS_ATTR_PTR(devid, replace_target),
|
|
BTRFS_ATTR_PTR(devid, scrub_speed_max),
|
|
BTRFS_ATTR_PTR(devid, writeable),
|
|
NULL
|
|
};
|
|
ATTRIBUTE_GROUPS(devid);
|
|
|
|
static void btrfs_release_devid_kobj(struct kobject *kobj)
|
|
{
|
|
struct btrfs_device *device = container_of(kobj, struct btrfs_device,
|
|
devid_kobj);
|
|
|
|
memset(&device->devid_kobj, 0, sizeof(struct kobject));
|
|
complete(&device->kobj_unregister);
|
|
}
|
|
|
|
static struct kobj_type devid_ktype = {
|
|
.sysfs_ops = &kobj_sysfs_ops,
|
|
.default_groups = devid_groups,
|
|
.release = btrfs_release_devid_kobj,
|
|
};
|
|
|
|
int btrfs_sysfs_add_device(struct btrfs_device *device)
|
|
{
|
|
int ret;
|
|
unsigned int nofs_flag;
|
|
struct kobject *devices_kobj;
|
|
struct kobject *devinfo_kobj;
|
|
|
|
/*
|
|
* Make sure we use the fs_info::fs_devices to fetch the kobjects even
|
|
* for the seed fs_devices
|
|
*/
|
|
devices_kobj = device->fs_info->fs_devices->devices_kobj;
|
|
devinfo_kobj = device->fs_info->fs_devices->devinfo_kobj;
|
|
ASSERT(devices_kobj);
|
|
ASSERT(devinfo_kobj);
|
|
|
|
nofs_flag = memalloc_nofs_save();
|
|
|
|
if (device->bdev) {
|
|
struct kobject *disk_kobj = bdev_kobj(device->bdev);
|
|
|
|
ret = sysfs_create_link(devices_kobj, disk_kobj, disk_kobj->name);
|
|
if (ret) {
|
|
btrfs_warn(device->fs_info,
|
|
"creating sysfs device link for devid %llu failed: %d",
|
|
device->devid, ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
init_completion(&device->kobj_unregister);
|
|
ret = kobject_init_and_add(&device->devid_kobj, &devid_ktype,
|
|
devinfo_kobj, "%llu", device->devid);
|
|
if (ret) {
|
|
kobject_put(&device->devid_kobj);
|
|
btrfs_warn(device->fs_info,
|
|
"devinfo init for devid %llu failed: %d",
|
|
device->devid, ret);
|
|
}
|
|
|
|
out:
|
|
memalloc_nofs_restore(nofs_flag);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_sysfs_add_fs_devices(struct btrfs_fs_devices *fs_devices)
|
|
{
|
|
int ret;
|
|
struct btrfs_device *device;
|
|
struct btrfs_fs_devices *seed;
|
|
|
|
list_for_each_entry(device, &fs_devices->devices, dev_list) {
|
|
ret = btrfs_sysfs_add_device(device);
|
|
if (ret)
|
|
goto fail;
|
|
}
|
|
|
|
list_for_each_entry(seed, &fs_devices->seed_list, seed_list) {
|
|
list_for_each_entry(device, &seed->devices, dev_list) {
|
|
ret = btrfs_sysfs_add_device(device);
|
|
if (ret)
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
btrfs_sysfs_remove_fs_devices(fs_devices);
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_kobject_uevent(struct block_device *bdev, enum kobject_action action)
|
|
{
|
|
int ret;
|
|
|
|
ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action);
|
|
if (ret)
|
|
pr_warn("BTRFS: Sending event '%d' to kobject: '%s' (%p): failed\n",
|
|
action, kobject_name(&disk_to_dev(bdev->bd_disk)->kobj),
|
|
&disk_to_dev(bdev->bd_disk)->kobj);
|
|
}
|
|
|
|
void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices)
|
|
|
|
{
|
|
char fsid_buf[BTRFS_UUID_UNPARSED_SIZE];
|
|
|
|
/*
|
|
* Sprouting changes fsid of the mounted filesystem, rename the fsid
|
|
* directory
|
|
*/
|
|
snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU", fs_devices->fsid);
|
|
if (kobject_rename(&fs_devices->fsid_kobj, fsid_buf))
|
|
btrfs_warn(fs_devices->fs_info,
|
|
"sysfs: failed to create fsid for sprout");
|
|
}
|
|
|
|
void btrfs_sysfs_update_devid(struct btrfs_device *device)
|
|
{
|
|
char tmp[24];
|
|
|
|
snprintf(tmp, sizeof(tmp), "%llu", device->devid);
|
|
|
|
if (kobject_rename(&device->devid_kobj, tmp))
|
|
btrfs_warn(device->fs_devices->fs_info,
|
|
"sysfs: failed to update devid for %llu",
|
|
device->devid);
|
|
}
|
|
|
|
/* /sys/fs/btrfs/ entry */
|
|
static struct kset *btrfs_kset;
|
|
|
|
/*
|
|
* Creates:
|
|
* /sys/fs/btrfs/UUID
|
|
*
|
|
* Can be called by the device discovery thread.
|
|
*/
|
|
int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs)
|
|
{
|
|
int error;
|
|
|
|
init_completion(&fs_devs->kobj_unregister);
|
|
fs_devs->fsid_kobj.kset = btrfs_kset;
|
|
error = kobject_init_and_add(&fs_devs->fsid_kobj, &btrfs_ktype, NULL,
|
|
"%pU", fs_devs->fsid);
|
|
if (error) {
|
|
kobject_put(&fs_devs->fsid_kobj);
|
|
return error;
|
|
}
|
|
|
|
fs_devs->devices_kobj = kobject_create_and_add("devices",
|
|
&fs_devs->fsid_kobj);
|
|
if (!fs_devs->devices_kobj) {
|
|
btrfs_err(fs_devs->fs_info,
|
|
"failed to init sysfs device interface");
|
|
btrfs_sysfs_remove_fsid(fs_devs);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
fs_devs->devinfo_kobj = kobject_create_and_add("devinfo",
|
|
&fs_devs->fsid_kobj);
|
|
if (!fs_devs->devinfo_kobj) {
|
|
btrfs_err(fs_devs->fs_info,
|
|
"failed to init sysfs devinfo kobject");
|
|
btrfs_sysfs_remove_fsid(fs_devs);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info)
|
|
{
|
|
int error;
|
|
struct btrfs_fs_devices *fs_devs = fs_info->fs_devices;
|
|
struct kobject *fsid_kobj = &fs_devs->fsid_kobj;
|
|
|
|
error = btrfs_sysfs_add_fs_devices(fs_devs);
|
|
if (error)
|
|
return error;
|
|
|
|
error = sysfs_create_files(fsid_kobj, btrfs_attrs);
|
|
if (error) {
|
|
btrfs_sysfs_remove_fs_devices(fs_devs);
|
|
return error;
|
|
}
|
|
|
|
error = sysfs_create_group(fsid_kobj,
|
|
&btrfs_feature_attr_group);
|
|
if (error)
|
|
goto failure;
|
|
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
fs_info->debug_kobj = kobject_create_and_add("debug", fsid_kobj);
|
|
if (!fs_info->debug_kobj) {
|
|
error = -ENOMEM;
|
|
goto failure;
|
|
}
|
|
|
|
error = sysfs_create_files(fs_info->debug_kobj, btrfs_debug_mount_attrs);
|
|
if (error)
|
|
goto failure;
|
|
#endif
|
|
|
|
/* Discard directory */
|
|
fs_info->discard_kobj = kobject_create_and_add("discard", fsid_kobj);
|
|
if (!fs_info->discard_kobj) {
|
|
error = -ENOMEM;
|
|
goto failure;
|
|
}
|
|
|
|
error = sysfs_create_files(fs_info->discard_kobj, discard_attrs);
|
|
if (error)
|
|
goto failure;
|
|
|
|
error = addrm_unknown_feature_attrs(fs_info, true);
|
|
if (error)
|
|
goto failure;
|
|
|
|
error = sysfs_create_link(fsid_kobj, &fs_info->sb->s_bdi->dev->kobj, "bdi");
|
|
if (error)
|
|
goto failure;
|
|
|
|
fs_info->space_info_kobj = kobject_create_and_add("allocation",
|
|
fsid_kobj);
|
|
if (!fs_info->space_info_kobj) {
|
|
error = -ENOMEM;
|
|
goto failure;
|
|
}
|
|
|
|
error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs);
|
|
if (error)
|
|
goto failure;
|
|
|
|
return 0;
|
|
failure:
|
|
btrfs_sysfs_remove_mounted(fs_info);
|
|
return error;
|
|
}
|
|
|
|
static ssize_t qgroup_enabled_show(struct kobject *qgroups_kobj,
|
|
struct kobj_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent);
|
|
bool enabled;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
enabled = fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON;
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
return sysfs_emit(buf, "%d\n", enabled);
|
|
}
|
|
BTRFS_ATTR(qgroups, enabled, qgroup_enabled_show);
|
|
|
|
static ssize_t qgroup_inconsistent_show(struct kobject *qgroups_kobj,
|
|
struct kobj_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent);
|
|
bool inconsistent;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
inconsistent = (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT);
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
return sysfs_emit(buf, "%d\n", inconsistent);
|
|
}
|
|
BTRFS_ATTR(qgroups, inconsistent, qgroup_inconsistent_show);
|
|
|
|
static ssize_t qgroup_drop_subtree_thres_show(struct kobject *qgroups_kobj,
|
|
struct kobj_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent);
|
|
u8 result;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
result = fs_info->qgroup_drop_subtree_thres;
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
return sysfs_emit(buf, "%d\n", result);
|
|
}
|
|
|
|
static ssize_t qgroup_drop_subtree_thres_store(struct kobject *qgroups_kobj,
|
|
struct kobj_attribute *a,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(qgroups_kobj->parent);
|
|
u8 new_thres;
|
|
int ret;
|
|
|
|
ret = kstrtou8(buf, 10, &new_thres);
|
|
if (ret)
|
|
return -EINVAL;
|
|
|
|
if (new_thres > BTRFS_MAX_LEVEL)
|
|
return -EINVAL;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
fs_info->qgroup_drop_subtree_thres = new_thres;
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
return len;
|
|
}
|
|
BTRFS_ATTR_RW(qgroups, drop_subtree_threshold, qgroup_drop_subtree_thres_show,
|
|
qgroup_drop_subtree_thres_store);
|
|
|
|
/*
|
|
* Qgroups global info
|
|
*
|
|
* Path: /sys/fs/btrfs/<uuid>/qgroups/
|
|
*/
|
|
static struct attribute *qgroups_attrs[] = {
|
|
BTRFS_ATTR_PTR(qgroups, enabled),
|
|
BTRFS_ATTR_PTR(qgroups, inconsistent),
|
|
BTRFS_ATTR_PTR(qgroups, drop_subtree_threshold),
|
|
NULL
|
|
};
|
|
ATTRIBUTE_GROUPS(qgroups);
|
|
|
|
static void qgroups_release(struct kobject *kobj)
|
|
{
|
|
kfree(kobj);
|
|
}
|
|
|
|
static struct kobj_type qgroups_ktype = {
|
|
.sysfs_ops = &kobj_sysfs_ops,
|
|
.default_groups = qgroups_groups,
|
|
.release = qgroups_release,
|
|
};
|
|
|
|
static inline struct btrfs_fs_info *qgroup_kobj_to_fs_info(struct kobject *kobj)
|
|
{
|
|
return to_fs_info(kobj->parent->parent);
|
|
}
|
|
|
|
#define QGROUP_ATTR(_member, _show_name) \
|
|
static ssize_t btrfs_qgroup_show_##_member(struct kobject *qgroup_kobj, \
|
|
struct kobj_attribute *a, \
|
|
char *buf) \
|
|
{ \
|
|
struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \
|
|
struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \
|
|
struct btrfs_qgroup, kobj); \
|
|
return btrfs_show_u64(&qgroup->_member, &fs_info->qgroup_lock, buf); \
|
|
} \
|
|
BTRFS_ATTR(qgroup, _show_name, btrfs_qgroup_show_##_member)
|
|
|
|
#define QGROUP_RSV_ATTR(_name, _type) \
|
|
static ssize_t btrfs_qgroup_rsv_show_##_name(struct kobject *qgroup_kobj, \
|
|
struct kobj_attribute *a, \
|
|
char *buf) \
|
|
{ \
|
|
struct btrfs_fs_info *fs_info = qgroup_kobj_to_fs_info(qgroup_kobj); \
|
|
struct btrfs_qgroup *qgroup = container_of(qgroup_kobj, \
|
|
struct btrfs_qgroup, kobj); \
|
|
return btrfs_show_u64(&qgroup->rsv.values[_type], \
|
|
&fs_info->qgroup_lock, buf); \
|
|
} \
|
|
BTRFS_ATTR(qgroup, rsv_##_name, btrfs_qgroup_rsv_show_##_name)
|
|
|
|
QGROUP_ATTR(rfer, referenced);
|
|
QGROUP_ATTR(excl, exclusive);
|
|
QGROUP_ATTR(max_rfer, max_referenced);
|
|
QGROUP_ATTR(max_excl, max_exclusive);
|
|
QGROUP_ATTR(lim_flags, limit_flags);
|
|
QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA);
|
|
QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS);
|
|
QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC);
|
|
|
|
/*
|
|
* Qgroup information.
|
|
*
|
|
* Path: /sys/fs/btrfs/<uuid>/qgroups/<level>_<qgroupid>/
|
|
*/
|
|
static struct attribute *qgroup_attrs[] = {
|
|
BTRFS_ATTR_PTR(qgroup, referenced),
|
|
BTRFS_ATTR_PTR(qgroup, exclusive),
|
|
BTRFS_ATTR_PTR(qgroup, max_referenced),
|
|
BTRFS_ATTR_PTR(qgroup, max_exclusive),
|
|
BTRFS_ATTR_PTR(qgroup, limit_flags),
|
|
BTRFS_ATTR_PTR(qgroup, rsv_data),
|
|
BTRFS_ATTR_PTR(qgroup, rsv_meta_pertrans),
|
|
BTRFS_ATTR_PTR(qgroup, rsv_meta_prealloc),
|
|
NULL
|
|
};
|
|
ATTRIBUTE_GROUPS(qgroup);
|
|
|
|
static void qgroup_release(struct kobject *kobj)
|
|
{
|
|
struct btrfs_qgroup *qgroup = container_of(kobj, struct btrfs_qgroup, kobj);
|
|
|
|
memset(&qgroup->kobj, 0, sizeof(*kobj));
|
|
}
|
|
|
|
static struct kobj_type qgroup_ktype = {
|
|
.sysfs_ops = &kobj_sysfs_ops,
|
|
.release = qgroup_release,
|
|
.default_groups = qgroup_groups,
|
|
};
|
|
|
|
int btrfs_sysfs_add_one_qgroup(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_qgroup *qgroup)
|
|
{
|
|
struct kobject *qgroups_kobj = fs_info->qgroups_kobj;
|
|
int ret;
|
|
|
|
if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
|
|
return 0;
|
|
if (qgroup->kobj.state_initialized)
|
|
return 0;
|
|
if (!qgroups_kobj)
|
|
return -EINVAL;
|
|
|
|
ret = kobject_init_and_add(&qgroup->kobj, &qgroup_ktype, qgroups_kobj,
|
|
"%hu_%llu", btrfs_qgroup_level(qgroup->qgroupid),
|
|
btrfs_qgroup_subvolid(qgroup->qgroupid));
|
|
if (ret < 0)
|
|
kobject_put(&qgroup->kobj);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_sysfs_del_qgroups(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_qgroup *qgroup;
|
|
struct btrfs_qgroup *next;
|
|
|
|
if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
|
|
return;
|
|
|
|
rbtree_postorder_for_each_entry_safe(qgroup, next,
|
|
&fs_info->qgroup_tree, node)
|
|
btrfs_sysfs_del_one_qgroup(fs_info, qgroup);
|
|
if (fs_info->qgroups_kobj) {
|
|
kobject_del(fs_info->qgroups_kobj);
|
|
kobject_put(fs_info->qgroups_kobj);
|
|
fs_info->qgroups_kobj = NULL;
|
|
}
|
|
}
|
|
|
|
/* Called when qgroups get initialized, thus there is no need for locking */
|
|
int btrfs_sysfs_add_qgroups(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj;
|
|
struct btrfs_qgroup *qgroup;
|
|
struct btrfs_qgroup *next;
|
|
int ret = 0;
|
|
|
|
if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
|
|
return 0;
|
|
|
|
ASSERT(fsid_kobj);
|
|
if (fs_info->qgroups_kobj)
|
|
return 0;
|
|
|
|
fs_info->qgroups_kobj = kzalloc(sizeof(struct kobject), GFP_KERNEL);
|
|
if (!fs_info->qgroups_kobj)
|
|
return -ENOMEM;
|
|
|
|
ret = kobject_init_and_add(fs_info->qgroups_kobj, &qgroups_ktype,
|
|
fsid_kobj, "qgroups");
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
rbtree_postorder_for_each_entry_safe(qgroup, next,
|
|
&fs_info->qgroup_tree, node) {
|
|
ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (ret < 0)
|
|
btrfs_sysfs_del_qgroups(fs_info);
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_sysfs_del_one_qgroup(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_qgroup *qgroup)
|
|
{
|
|
if (test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state))
|
|
return;
|
|
|
|
if (qgroup->kobj.state_initialized) {
|
|
kobject_del(&qgroup->kobj);
|
|
kobject_put(&qgroup->kobj);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Change per-fs features in /sys/fs/btrfs/UUID/features to match current
|
|
* values in superblock. Call after any changes to incompat/compat_ro flags
|
|
*/
|
|
void btrfs_sysfs_feature_update(struct btrfs_fs_info *fs_info,
|
|
u64 bit, enum btrfs_feature_set set)
|
|
{
|
|
struct btrfs_fs_devices *fs_devs;
|
|
struct kobject *fsid_kobj;
|
|
u64 __maybe_unused features;
|
|
int __maybe_unused ret;
|
|
|
|
if (!fs_info)
|
|
return;
|
|
|
|
/*
|
|
* See 14e46e04958df74 and e410e34fad913dd, feature bit updates are not
|
|
* safe when called from some contexts (eg. balance)
|
|
*/
|
|
features = get_features(fs_info, set);
|
|
ASSERT(bit & supported_feature_masks[set]);
|
|
|
|
fs_devs = fs_info->fs_devices;
|
|
fsid_kobj = &fs_devs->fsid_kobj;
|
|
|
|
if (!fsid_kobj->state_initialized)
|
|
return;
|
|
|
|
/*
|
|
* FIXME: this is too heavy to update just one value, ideally we'd like
|
|
* to use sysfs_update_group but some refactoring is needed first.
|
|
*/
|
|
sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
|
|
ret = sysfs_create_group(fsid_kobj, &btrfs_feature_attr_group);
|
|
}
|
|
|
|
int __init btrfs_init_sysfs(void)
|
|
{
|
|
int ret;
|
|
|
|
btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
|
|
if (!btrfs_kset)
|
|
return -ENOMEM;
|
|
|
|
init_feature_attrs();
|
|
ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
|
|
if (ret)
|
|
goto out2;
|
|
ret = sysfs_merge_group(&btrfs_kset->kobj,
|
|
&btrfs_static_feature_attr_group);
|
|
if (ret)
|
|
goto out_remove_group;
|
|
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
|
|
if (ret) {
|
|
sysfs_unmerge_group(&btrfs_kset->kobj,
|
|
&btrfs_static_feature_attr_group);
|
|
goto out_remove_group;
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
out_remove_group:
|
|
sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
|
|
out2:
|
|
kset_unregister(btrfs_kset);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void __cold btrfs_exit_sysfs(void)
|
|
{
|
|
sysfs_unmerge_group(&btrfs_kset->kobj,
|
|
&btrfs_static_feature_attr_group);
|
|
sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
sysfs_remove_group(&btrfs_kset->kobj, &btrfs_debug_feature_attr_group);
|
|
#endif
|
|
kset_unregister(btrfs_kset);
|
|
}
|