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![Nikolay Borisov](/assets/img/avatar_default.png)
Since the metadata_uuid is a new incompat feature it requires the respective sysfs hooks. This patch adds the 'metdata_uuid' feature to be shown if it supported by the kernel. Additionally it adds /sys/fs/btrfs/UUID/metadata_uuid attribute which allows one to read the current metadata_uuid. Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
971 lines
25 KiB
C
971 lines
25 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/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/kobject.h>
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#include <linux/bug.h>
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#include <linux/debugfs.h>
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#include "ctree.h"
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#include "disk-io.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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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 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 snprintf(buf, PAGE_SIZE, "%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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btrfs_set_pending(fs_info, COMMIT);
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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(mixed_backref, MIXED_BACKREF);
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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(big_metadata, BIG_METADATA);
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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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static struct attribute *btrfs_supported_feature_attrs[] = {
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BTRFS_FEAT_ATTR_PTR(mixed_backref),
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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(big_metadata),
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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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NULL
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};
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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 lists all available features of this kernel while
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* /sys/fs/btrfs/UUID/features shows features of the fs which are enabled or
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* can be changed online.
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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 snprintf(buf, PAGE_SIZE, "0\n");
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}
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BTRFS_ATTR(static_feature, rmdir_subvol, rmdir_subvol_show);
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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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NULL
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};
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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_feature_attr_group
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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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static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf)
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{
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u64 val;
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if (lock)
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spin_lock(lock);
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val = *value_ptr;
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if (lock)
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spin_unlock(lock);
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return snprintf(buf, PAGE_SIZE, "%llu\n", val);
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}
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static ssize_t global_rsv_size_show(struct kobject *kobj,
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struct kobj_attribute *ka, char *buf)
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{
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struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
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struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
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return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf);
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}
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BTRFS_ATTR(allocation, global_rsv_size, global_rsv_size_show);
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static ssize_t global_rsv_reserved_show(struct kobject *kobj,
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struct kobj_attribute *a, char *buf)
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{
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struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent);
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struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
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return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf);
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}
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BTRFS_ATTR(allocation, global_rsv_reserved, global_rsv_reserved_show);
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#define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj)
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#define to_raid_kobj(_kobj) container_of(_kobj, struct raid_kobject, kobj)
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static ssize_t raid_bytes_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf);
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BTRFS_ATTR(raid, total_bytes, raid_bytes_show);
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BTRFS_ATTR(raid, used_bytes, raid_bytes_show);
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static ssize_t raid_bytes_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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struct btrfs_space_info *sinfo = to_space_info(kobj->parent);
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struct btrfs_block_group_cache *block_group;
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int index = btrfs_bg_flags_to_raid_index(to_raid_kobj(kobj)->flags);
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u64 val = 0;
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down_read(&sinfo->groups_sem);
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list_for_each_entry(block_group, &sinfo->block_groups[index], list) {
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if (&attr->attr == BTRFS_ATTR_PTR(raid, total_bytes))
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val += block_group->key.offset;
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else
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val += btrfs_block_group_used(&block_group->item);
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}
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up_read(&sinfo->groups_sem);
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return snprintf(buf, PAGE_SIZE, "%llu\n", val);
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}
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static struct attribute *raid_attributes[] = {
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BTRFS_ATTR_PTR(raid, total_bytes),
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BTRFS_ATTR_PTR(raid, used_bytes),
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NULL
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};
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static void release_raid_kobj(struct kobject *kobj)
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{
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kfree(to_raid_kobj(kobj));
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}
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struct kobj_type btrfs_raid_ktype = {
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.sysfs_ops = &kobj_sysfs_ops,
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.release = release_raid_kobj,
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.default_attrs = raid_attributes,
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};
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#define SPACE_INFO_ATTR(field) \
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static ssize_t btrfs_space_info_show_##field(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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struct btrfs_space_info *sinfo = to_space_info(kobj); \
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return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \
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} \
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BTRFS_ATTR(space_info, field, btrfs_space_info_show_##field)
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static ssize_t btrfs_space_info_show_total_bytes_pinned(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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struct btrfs_space_info *sinfo = to_space_info(kobj);
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s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned);
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return snprintf(buf, PAGE_SIZE, "%lld\n", val);
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}
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SPACE_INFO_ATTR(flags);
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SPACE_INFO_ATTR(total_bytes);
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SPACE_INFO_ATTR(bytes_used);
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SPACE_INFO_ATTR(bytes_pinned);
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SPACE_INFO_ATTR(bytes_reserved);
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SPACE_INFO_ATTR(bytes_may_use);
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SPACE_INFO_ATTR(bytes_readonly);
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SPACE_INFO_ATTR(disk_used);
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SPACE_INFO_ATTR(disk_total);
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BTRFS_ATTR(space_info, total_bytes_pinned,
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btrfs_space_info_show_total_bytes_pinned);
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static struct attribute *space_info_attrs[] = {
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BTRFS_ATTR_PTR(space_info, flags),
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BTRFS_ATTR_PTR(space_info, total_bytes),
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BTRFS_ATTR_PTR(space_info, bytes_used),
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BTRFS_ATTR_PTR(space_info, bytes_pinned),
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BTRFS_ATTR_PTR(space_info, bytes_reserved),
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BTRFS_ATTR_PTR(space_info, bytes_may_use),
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BTRFS_ATTR_PTR(space_info, bytes_readonly),
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BTRFS_ATTR_PTR(space_info, disk_used),
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BTRFS_ATTR_PTR(space_info, disk_total),
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BTRFS_ATTR_PTR(space_info, total_bytes_pinned),
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NULL,
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};
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static void space_info_release(struct kobject *kobj)
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{
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struct btrfs_space_info *sinfo = to_space_info(kobj);
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percpu_counter_destroy(&sinfo->total_bytes_pinned);
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kfree(sinfo);
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}
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struct kobj_type space_info_ktype = {
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.sysfs_ops = &kobj_sysfs_ops,
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.release = space_info_release,
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.default_attrs = space_info_attrs,
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};
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static const struct attribute *allocation_attrs[] = {
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BTRFS_ATTR_PTR(allocation, global_rsv_reserved),
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BTRFS_ATTR_PTR(allocation, global_rsv_size),
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NULL,
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};
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static ssize_t btrfs_label_show(struct kobject *kobj,
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struct kobj_attribute *a, char *buf)
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{
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struct btrfs_fs_info *fs_info = to_fs_info(kobj);
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char *label = fs_info->super_copy->label;
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ssize_t ret;
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spin_lock(&fs_info->super_lock);
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ret = snprintf(buf, PAGE_SIZE, label[0] ? "%s\n" : "%s", label);
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spin_unlock(&fs_info->super_lock);
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return ret;
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}
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static ssize_t btrfs_label_store(struct kobject *kobj,
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struct kobj_attribute *a,
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const char *buf, size_t len)
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{
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struct btrfs_fs_info *fs_info = to_fs_info(kobj);
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size_t p_len;
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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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/*
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* p_len is the len until the first occurrence of either
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* '\n' or '\0'
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*/
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p_len = strcspn(buf, "\n");
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if (p_len >= BTRFS_LABEL_SIZE)
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return -EINVAL;
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spin_lock(&fs_info->super_lock);
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memset(fs_info->super_copy->label, 0, BTRFS_LABEL_SIZE);
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memcpy(fs_info->super_copy->label, buf, p_len);
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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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btrfs_set_pending(fs_info, COMMIT);
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wake_up_process(fs_info->transaction_kthread);
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return len;
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}
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BTRFS_ATTR_RW(, label, btrfs_label_show, btrfs_label_store);
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static ssize_t btrfs_nodesize_show(struct kobject *kobj,
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struct kobj_attribute *a, char *buf)
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{
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struct btrfs_fs_info *fs_info = to_fs_info(kobj);
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return snprintf(buf, PAGE_SIZE, "%u\n", fs_info->super_copy->nodesize);
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}
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BTRFS_ATTR(, nodesize, btrfs_nodesize_show);
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static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
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|
struct kobj_attribute *a, char *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%u\n",
|
|
fs_info->super_copy->sectorsize);
|
|
}
|
|
|
|
BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show);
|
|
|
|
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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%pU\n",
|
|
fs_info->fs_devices->metadata_uuid);
|
|
}
|
|
|
|
BTRFS_ATTR(, metadata_uuid, btrfs_metadata_uuid_show);
|
|
|
|
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),
|
|
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;
|
|
}
|
|
|
|
#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 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->device_dir_kobj) {
|
|
kobject_del(fs_devs->device_dir_kobj);
|
|
kobject_put(fs_devs->device_dir_kobj);
|
|
fs_devs->device_dir_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);
|
|
}
|
|
}
|
|
|
|
void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info)
|
|
{
|
|
btrfs_reset_fs_info_ptr(fs_info);
|
|
|
|
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);
|
|
}
|
|
addrm_unknown_feature_attrs(fs_info, false);
|
|
sysfs_remove_group(&fs_info->fs_devices->fsid_kobj, &btrfs_feature_attr_group);
|
|
sysfs_remove_files(&fs_info->fs_devices->fsid_kobj, btrfs_attrs);
|
|
btrfs_sysfs_rm_device_link(fs_info->fs_devices, NULL);
|
|
}
|
|
|
|
const char * const btrfs_feature_set_names[FEAT_MAX] = {
|
|
[FEAT_COMPAT] = "compat",
|
|
[FEAT_COMPAT_RO] = "compat_ro",
|
|
[FEAT_INCOMPAT] = "incompat",
|
|
};
|
|
|
|
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 += snprintf(str + len, bufsize - len, "%s%s",
|
|
len ? "," : "", name);
|
|
}
|
|
|
|
return str;
|
|
}
|
|
|
|
static void init_feature_attrs(void)
|
|
{
|
|
struct btrfs_feature_attr *fa;
|
|
int set, i;
|
|
|
|
BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) !=
|
|
ARRAY_SIZE(btrfs_feature_attrs));
|
|
BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) !=
|
|
ARRAY_SIZE(btrfs_feature_attrs[0]));
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* when one_device is NULL, it removes all device links */
|
|
|
|
int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,
|
|
struct btrfs_device *one_device)
|
|
{
|
|
struct hd_struct *disk;
|
|
struct kobject *disk_kobj;
|
|
|
|
if (!fs_devices->device_dir_kobj)
|
|
return -EINVAL;
|
|
|
|
if (one_device && one_device->bdev) {
|
|
disk = one_device->bdev->bd_part;
|
|
disk_kobj = &part_to_dev(disk)->kobj;
|
|
|
|
sysfs_remove_link(fs_devices->device_dir_kobj,
|
|
disk_kobj->name);
|
|
}
|
|
|
|
if (one_device)
|
|
return 0;
|
|
|
|
list_for_each_entry(one_device,
|
|
&fs_devices->devices, dev_list) {
|
|
if (!one_device->bdev)
|
|
continue;
|
|
disk = one_device->bdev->bd_part;
|
|
disk_kobj = &part_to_dev(disk)->kobj;
|
|
|
|
sysfs_remove_link(fs_devices->device_dir_kobj,
|
|
disk_kobj->name);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs)
|
|
{
|
|
if (!fs_devs->device_dir_kobj)
|
|
fs_devs->device_dir_kobj = kobject_create_and_add("devices",
|
|
&fs_devs->fsid_kobj);
|
|
|
|
if (!fs_devs->device_dir_kobj)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices,
|
|
struct btrfs_device *one_device)
|
|
{
|
|
int error = 0;
|
|
struct btrfs_device *dev;
|
|
|
|
list_for_each_entry(dev, &fs_devices->devices, dev_list) {
|
|
struct hd_struct *disk;
|
|
struct kobject *disk_kobj;
|
|
|
|
if (!dev->bdev)
|
|
continue;
|
|
|
|
if (one_device && one_device != dev)
|
|
continue;
|
|
|
|
disk = dev->bdev->bd_part;
|
|
disk_kobj = &part_to_dev(disk)->kobj;
|
|
|
|
error = sysfs_create_link(fs_devices->device_dir_kobj,
|
|
disk_kobj, disk_kobj->name);
|
|
if (error)
|
|
break;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/* /sys/fs/btrfs/ entry */
|
|
static struct kset *btrfs_kset;
|
|
|
|
/* /sys/kernel/debug/btrfs */
|
|
static struct dentry *btrfs_debugfs_root_dentry;
|
|
|
|
/* Debugging tunables and exported data */
|
|
u64 btrfs_debugfs_test;
|
|
|
|
/*
|
|
* Can be called by the device discovery thread.
|
|
* And parent can be specified for seed device
|
|
*/
|
|
int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs,
|
|
struct kobject *parent)
|
|
{
|
|
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, parent, "%pU", fs_devs->fsid);
|
|
return error;
|
|
}
|
|
|
|
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;
|
|
|
|
btrfs_set_fs_info_ptr(fs_info);
|
|
|
|
error = btrfs_sysfs_add_device_link(fs_devs, NULL);
|
|
if (error)
|
|
return error;
|
|
|
|
error = sysfs_create_files(fsid_kobj, btrfs_attrs);
|
|
if (error) {
|
|
btrfs_sysfs_rm_device_link(fs_devs, NULL);
|
|
return error;
|
|
}
|
|
|
|
error = sysfs_create_group(fsid_kobj,
|
|
&btrfs_feature_attr_group);
|
|
if (error)
|
|
goto failure;
|
|
|
|
error = addrm_unknown_feature_attrs(fs_info, true);
|
|
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;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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 features;
|
|
int ret;
|
|
|
|
if (!fs_info)
|
|
return;
|
|
|
|
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);
|
|
}
|
|
|
|
static int btrfs_init_debugfs(void)
|
|
{
|
|
#ifdef CONFIG_DEBUG_FS
|
|
btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL);
|
|
if (!btrfs_debugfs_root_dentry)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Example code, how to export data through debugfs.
|
|
*
|
|
* file: /sys/kernel/debug/btrfs/test
|
|
* contents of: btrfs_debugfs_test
|
|
*/
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
debugfs_create_u64("test", S_IRUGO | S_IWUSR, btrfs_debugfs_root_dentry,
|
|
&btrfs_debugfs_test);
|
|
#endif
|
|
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
int __init btrfs_init_sysfs(void)
|
|
{
|
|
int ret;
|
|
|
|
btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
|
|
if (!btrfs_kset)
|
|
return -ENOMEM;
|
|
|
|
ret = btrfs_init_debugfs();
|
|
if (ret)
|
|
goto out1;
|
|
|
|
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;
|
|
|
|
return 0;
|
|
|
|
out_remove_group:
|
|
sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
|
|
out2:
|
|
debugfs_remove_recursive(btrfs_debugfs_root_dentry);
|
|
out1:
|
|
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);
|
|
kset_unregister(btrfs_kset);
|
|
debugfs_remove_recursive(btrfs_debugfs_root_dentry);
|
|
}
|
|
|