2007-06-12 15:07:21 +02:00
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/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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2007-08-29 21:47:34 +02:00
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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/buffer_head.h>
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#include <linux/kobject.h>
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2013-11-01 18:07:00 +01:00
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#include <linux/bug.h>
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2007-08-29 21:47:34 +02:00
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2007-04-05 03:22:22 +02:00
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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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2013-11-01 18:06:57 +01:00
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#include "sysfs.h"
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2013-11-01 18:06:59 +01:00
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static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
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2013-11-01 18:06:58 +01:00
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2013-11-01 18:06:59 +01:00
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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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2013-11-01 18:06:58 +01:00
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{
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2013-11-01 18:06:59 +01:00
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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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2013-11-01 18:06:58 +01:00
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}
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2013-11-01 18:07:01 +01:00
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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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BUG();
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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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2013-11-01 18:06:59 +01:00
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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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2013-11-01 18:06:58 +01:00
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{
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2013-11-01 18:06:59 +01:00
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int val = 0;
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2013-11-01 18:06:58 +01:00
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struct btrfs_fs_info *fs_info = to_fs_info(kobj);
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2013-11-01 18:07:01 +01:00
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struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
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2013-11-01 18:06:59 +01:00
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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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2013-11-01 18:07:01 +01:00
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} else
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val = can_modify_feature(fa);
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2013-11-01 18:06:59 +01:00
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return snprintf(buf, PAGE_SIZE, "%d\n", val);
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2013-11-01 18:06:58 +01:00
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}
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2013-11-01 18:07:01 +01:00
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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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struct btrfs_trans_handle *trans;
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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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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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trans = btrfs_start_transaction(fs_info->fs_root, 1);
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if (IS_ERR(trans))
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return PTR_ERR(trans);
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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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ret = btrfs_commit_transaction(trans, fs_info->fs_root);
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if (ret)
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return ret;
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return count;
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}
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2013-11-01 18:06:59 +01:00
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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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2013-11-01 18:06:57 +01:00
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{
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2013-11-01 18:06:59 +01:00
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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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2013-11-01 18:07:01 +01:00
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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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2013-11-01 18:06:59 +01:00
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mode = 0;
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}
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return mode;
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2013-11-01 18:06:57 +01:00
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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_lzov2, COMPRESS_LZOv2);
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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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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_lzov2),
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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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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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2013-11-01 18:06:59 +01:00
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.is_visible = btrfs_feature_visible,
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2013-11-01 18:06:57 +01:00
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.attrs = btrfs_supported_feature_attrs,
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};
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2007-08-29 21:47:34 +02:00
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2013-11-01 18:06:59 +01:00
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static void btrfs_release_super_kobj(struct kobject *kobj)
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{
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struct btrfs_fs_info *fs_info = to_fs_info(kobj);
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complete(&fs_info->kobj_unregister);
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}
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static struct kobj_type btrfs_ktype = {
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.sysfs_ops = &kobj_sysfs_ops,
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.release = btrfs_release_super_kobj,
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};
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static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
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{
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if (kobj->ktype != &btrfs_ktype)
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return NULL;
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return container_of(kobj, struct btrfs_fs_info, super_kobj);
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}
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2007-08-29 21:47:34 +02:00
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2013-11-01 18:06:58 +01:00
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void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
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{
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kobject_del(&fs_info->super_kobj);
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kobject_put(&fs_info->super_kobj);
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wait_for_completion(&fs_info->kobj_unregister);
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}
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2013-11-01 18:07:00 +01:00
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const char * const btrfs_feature_set_names[3] = {
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[FEAT_COMPAT] = "compat",
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[FEAT_COMPAT_RO] = "compat_ro",
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[FEAT_INCOMPAT] = "incompat",
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};
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#define NUM_FEATURE_BITS 64
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static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13];
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static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS];
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2013-11-01 18:07:02 +01:00
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char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags)
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{
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size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */
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int len = 0;
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int i;
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char *str;
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str = kmalloc(bufsize, GFP_KERNEL);
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if (!str)
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return str;
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for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
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const char *name;
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if (!(flags & (1ULL << i)))
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continue;
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name = btrfs_feature_attrs[set][i].kobj_attr.attr.name;
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len += snprintf(str + len, bufsize - len, "%s%s",
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len ? "," : "", name);
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}
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return str;
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}
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2013-11-01 18:07:00 +01:00
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static void init_feature_attrs(void)
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{
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struct btrfs_feature_attr *fa;
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int set, i;
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BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) !=
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ARRAY_SIZE(btrfs_feature_attrs));
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BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) !=
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ARRAY_SIZE(btrfs_feature_attrs[0]));
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2013-11-01 18:07:02 +01:00
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memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs));
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memset(btrfs_unknown_feature_names, 0,
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sizeof(btrfs_unknown_feature_names));
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2013-11-01 18:07:00 +01:00
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for (i = 0; btrfs_supported_feature_attrs[i]; i++) {
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struct btrfs_feature_attr *sfa;
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struct attribute *a = btrfs_supported_feature_attrs[i];
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2013-11-01 18:07:02 +01:00
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int bit;
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2013-11-01 18:07:00 +01:00
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sfa = attr_to_btrfs_feature_attr(a);
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2013-11-01 18:07:02 +01:00
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bit = ilog2(sfa->feature_bit);
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fa = &btrfs_feature_attrs[sfa->feature_set][bit];
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2013-11-01 18:07:00 +01:00
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fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name;
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}
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for (set = 0; set < FEAT_MAX; set++) {
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for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) {
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char *name = btrfs_unknown_feature_names[set][i];
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fa = &btrfs_feature_attrs[set][i];
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if (fa->kobj_attr.attr.name)
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continue;
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snprintf(name, 13, "%s:%u",
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btrfs_feature_set_names[set], i);
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fa->kobj_attr.attr.name = name;
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fa->kobj_attr.attr.mode = S_IRUGO;
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fa->feature_set = set;
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fa->feature_bit = 1ULL << i;
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|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static u64 supported_feature_masks[3] = {
|
|
|
|
[FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP,
|
|
|
|
[FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP,
|
|
|
|
[FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int add_unknown_feature_attrs(struct btrfs_fs_info *fs_info)
|
|
|
|
{
|
|
|
|
int set;
|
|
|
|
|
|
|
|
for (set = 0; set < FEAT_MAX; set++) {
|
|
|
|
int i, count, ret, index = 0;
|
|
|
|
struct attribute **attrs;
|
|
|
|
struct attribute_group agroup = {
|
|
|
|
.name = "features",
|
|
|
|
};
|
|
|
|
u64 features = get_features(fs_info, set);
|
|
|
|
features &= ~supported_feature_masks[set];
|
|
|
|
|
|
|
|
count = hweight64(features);
|
|
|
|
|
|
|
|
if (!count)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
attrs = kcalloc(count + 1, sizeof(void *), GFP_KERNEL);
|
|
|
|
|
|
|
|
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[index++] = &fa->kobj_attr.attr;
|
|
|
|
}
|
|
|
|
|
|
|
|
attrs[index] = NULL;
|
|
|
|
agroup.attrs = attrs;
|
|
|
|
|
|
|
|
ret = sysfs_merge_group(&fs_info->super_kobj, &agroup);
|
|
|
|
kfree(attrs);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2013-11-01 18:06:59 +01:00
|
|
|
/* /sys/fs/btrfs/ entry */
|
|
|
|
static struct kset *btrfs_kset;
|
|
|
|
|
2013-11-01 18:06:58 +01:00
|
|
|
int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
|
|
|
|
{
|
|
|
|
int error;
|
|
|
|
|
|
|
|
init_completion(&fs_info->kobj_unregister);
|
2013-11-01 18:06:59 +01:00
|
|
|
fs_info->super_kobj.kset = btrfs_kset;
|
2013-11-01 18:06:58 +01:00
|
|
|
error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL,
|
|
|
|
"%pU", fs_info->fsid);
|
2013-11-01 18:06:59 +01:00
|
|
|
|
|
|
|
error = sysfs_create_group(&fs_info->super_kobj,
|
|
|
|
&btrfs_feature_attr_group);
|
|
|
|
if (error)
|
2013-11-01 18:07:00 +01:00
|
|
|
goto failure;
|
|
|
|
|
|
|
|
error = add_unknown_feature_attrs(fs_info);
|
|
|
|
if (error)
|
|
|
|
goto failure;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
failure:
|
|
|
|
btrfs_sysfs_remove_one(fs_info);
|
2013-11-01 18:06:58 +01:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2008-09-05 22:43:31 +02:00
|
|
|
int btrfs_init_sysfs(void)
|
2007-08-29 21:47:34 +02:00
|
|
|
{
|
2013-11-01 18:06:57 +01:00
|
|
|
int ret;
|
2008-02-20 20:14:16 +01:00
|
|
|
btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
|
|
|
|
if (!btrfs_kset)
|
|
|
|
return -ENOMEM;
|
2013-11-01 18:06:57 +01:00
|
|
|
|
2013-11-01 18:07:00 +01:00
|
|
|
init_feature_attrs();
|
|
|
|
|
2013-11-01 18:06:57 +01:00
|
|
|
ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
|
|
|
|
if (ret) {
|
|
|
|
kset_unregister(btrfs_kset);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2008-02-20 20:14:16 +01:00
|
|
|
return 0;
|
2007-08-29 21:47:34 +02:00
|
|
|
}
|
|
|
|
|
2008-09-05 22:43:31 +02:00
|
|
|
void btrfs_exit_sysfs(void)
|
2007-08-29 21:47:34 +02:00
|
|
|
{
|
2013-11-01 18:06:57 +01:00
|
|
|
sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group);
|
2008-02-20 20:14:16 +01:00
|
|
|
kset_unregister(btrfs_kset);
|
2007-08-29 21:47:34 +02:00
|
|
|
}
|
2008-02-20 22:02:51 +01:00
|
|
|
|