278 lines
6.3 KiB
C
278 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C), 2008-2021, OPPO Mobile Comm Corp., Ltd.
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* https://www.oppo.com/
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*/
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#include <linux/sysfs.h>
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#include <linux/kobject.h>
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#include "internal.h"
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enum {
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attr_feature,
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attr_pointer_ui,
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attr_pointer_bool,
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};
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enum {
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struct_erofs_sb_info,
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struct_erofs_mount_opts,
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};
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struct erofs_attr {
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struct attribute attr;
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short attr_id;
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int struct_type, offset;
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};
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#define EROFS_ATTR(_name, _mode, _id) \
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static struct erofs_attr erofs_attr_##_name = { \
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.attr = {.name = __stringify(_name), .mode = _mode }, \
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.attr_id = attr_##_id, \
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}
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#define EROFS_ATTR_FUNC(_name, _mode) EROFS_ATTR(_name, _mode, _name)
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#define EROFS_ATTR_FEATURE(_name) EROFS_ATTR(_name, 0444, feature)
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#define EROFS_ATTR_OFFSET(_name, _mode, _id, _struct) \
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static struct erofs_attr erofs_attr_##_name = { \
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.attr = {.name = __stringify(_name), .mode = _mode }, \
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.attr_id = attr_##_id, \
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.struct_type = struct_##_struct, \
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.offset = offsetof(struct _struct, _name),\
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}
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#define EROFS_ATTR_RW(_name, _id, _struct) \
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EROFS_ATTR_OFFSET(_name, 0644, _id, _struct)
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#define EROFS_RO_ATTR(_name, _id, _struct) \
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EROFS_ATTR_OFFSET(_name, 0444, _id, _struct)
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#define EROFS_ATTR_RW_UI(_name, _struct) \
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EROFS_ATTR_RW(_name, pointer_ui, _struct)
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#define EROFS_ATTR_RW_BOOL(_name, _struct) \
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EROFS_ATTR_RW(_name, pointer_bool, _struct)
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#define ATTR_LIST(name) (&erofs_attr_##name.attr)
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#ifdef CONFIG_EROFS_FS_ZIP
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EROFS_ATTR_RW_UI(sync_decompress, erofs_mount_opts);
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#endif
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static struct attribute *erofs_attrs[] = {
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#ifdef CONFIG_EROFS_FS_ZIP
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ATTR_LIST(sync_decompress),
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#endif
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NULL,
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};
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ATTRIBUTE_GROUPS(erofs);
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/* Features this copy of erofs supports */
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EROFS_ATTR_FEATURE(zero_padding);
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EROFS_ATTR_FEATURE(compr_cfgs);
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EROFS_ATTR_FEATURE(big_pcluster);
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EROFS_ATTR_FEATURE(chunked_file);
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EROFS_ATTR_FEATURE(device_table);
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EROFS_ATTR_FEATURE(compr_head2);
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EROFS_ATTR_FEATURE(sb_chksum);
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EROFS_ATTR_FEATURE(ztailpacking);
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EROFS_ATTR_FEATURE(fragments);
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EROFS_ATTR_FEATURE(dedupe);
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static struct attribute *erofs_feat_attrs[] = {
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ATTR_LIST(zero_padding),
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ATTR_LIST(compr_cfgs),
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ATTR_LIST(big_pcluster),
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ATTR_LIST(chunked_file),
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ATTR_LIST(device_table),
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ATTR_LIST(compr_head2),
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ATTR_LIST(sb_chksum),
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ATTR_LIST(ztailpacking),
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ATTR_LIST(fragments),
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ATTR_LIST(dedupe),
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NULL,
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};
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ATTRIBUTE_GROUPS(erofs_feat);
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static unsigned char *__struct_ptr(struct erofs_sb_info *sbi,
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int struct_type, int offset)
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{
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if (struct_type == struct_erofs_sb_info)
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return (unsigned char *)sbi + offset;
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if (struct_type == struct_erofs_mount_opts)
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return (unsigned char *)&sbi->opt + offset;
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return NULL;
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}
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static ssize_t erofs_attr_show(struct kobject *kobj,
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struct attribute *attr, char *buf)
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{
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struct erofs_sb_info *sbi = container_of(kobj, struct erofs_sb_info,
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s_kobj);
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struct erofs_attr *a = container_of(attr, struct erofs_attr, attr);
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unsigned char *ptr = __struct_ptr(sbi, a->struct_type, a->offset);
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switch (a->attr_id) {
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case attr_feature:
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return sysfs_emit(buf, "supported\n");
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case attr_pointer_ui:
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if (!ptr)
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return 0;
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return sysfs_emit(buf, "%u\n", *(unsigned int *)ptr);
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case attr_pointer_bool:
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if (!ptr)
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return 0;
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return sysfs_emit(buf, "%d\n", *(bool *)ptr);
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}
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return 0;
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}
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static ssize_t erofs_attr_store(struct kobject *kobj, struct attribute *attr,
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const char *buf, size_t len)
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{
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struct erofs_sb_info *sbi = container_of(kobj, struct erofs_sb_info,
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s_kobj);
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struct erofs_attr *a = container_of(attr, struct erofs_attr, attr);
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unsigned char *ptr = __struct_ptr(sbi, a->struct_type, a->offset);
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unsigned long t;
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int ret;
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switch (a->attr_id) {
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case attr_pointer_ui:
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if (!ptr)
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return 0;
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ret = kstrtoul(skip_spaces(buf), 0, &t);
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if (ret)
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return ret;
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if (t != (unsigned int)t)
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return -ERANGE;
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#ifdef CONFIG_EROFS_FS_ZIP
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if (!strcmp(a->attr.name, "sync_decompress") &&
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(t > EROFS_SYNC_DECOMPRESS_FORCE_OFF))
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return -EINVAL;
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#endif
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*(unsigned int *)ptr = t;
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return len;
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case attr_pointer_bool:
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if (!ptr)
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return 0;
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ret = kstrtoul(skip_spaces(buf), 0, &t);
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if (ret)
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return ret;
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if (t != 0 && t != 1)
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return -EINVAL;
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*(bool *)ptr = !!t;
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return len;
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}
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return 0;
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}
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static void erofs_sb_release(struct kobject *kobj)
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{
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struct erofs_sb_info *sbi = container_of(kobj, struct erofs_sb_info,
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s_kobj);
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complete(&sbi->s_kobj_unregister);
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}
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static const struct sysfs_ops erofs_attr_ops = {
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.show = erofs_attr_show,
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.store = erofs_attr_store,
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};
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static const struct kobj_type erofs_sb_ktype = {
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.default_groups = erofs_groups,
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.sysfs_ops = &erofs_attr_ops,
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.release = erofs_sb_release,
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};
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static const struct kobj_type erofs_ktype = {
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.sysfs_ops = &erofs_attr_ops,
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};
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static struct kset erofs_root = {
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.kobj = {.ktype = &erofs_ktype},
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};
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static const struct kobj_type erofs_feat_ktype = {
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.default_groups = erofs_feat_groups,
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.sysfs_ops = &erofs_attr_ops,
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};
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static struct kobject erofs_feat = {
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.kset = &erofs_root,
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};
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int erofs_register_sysfs(struct super_block *sb)
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{
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struct erofs_sb_info *sbi = EROFS_SB(sb);
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char *name;
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char *str = NULL;
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int err;
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if (erofs_is_fscache_mode(sb)) {
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if (sbi->domain_id) {
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str = kasprintf(GFP_KERNEL, "%s,%s", sbi->domain_id,
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sbi->fsid);
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if (!str)
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return -ENOMEM;
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name = str;
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} else {
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name = sbi->fsid;
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}
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} else {
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name = sb->s_id;
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}
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sbi->s_kobj.kset = &erofs_root;
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init_completion(&sbi->s_kobj_unregister);
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err = kobject_init_and_add(&sbi->s_kobj, &erofs_sb_ktype, NULL, "%s", name);
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kfree(str);
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if (err)
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goto put_sb_kobj;
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return 0;
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put_sb_kobj:
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kobject_put(&sbi->s_kobj);
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wait_for_completion(&sbi->s_kobj_unregister);
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return err;
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}
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void erofs_unregister_sysfs(struct super_block *sb)
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{
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struct erofs_sb_info *sbi = EROFS_SB(sb);
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if (sbi->s_kobj.state_in_sysfs) {
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kobject_del(&sbi->s_kobj);
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kobject_put(&sbi->s_kobj);
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wait_for_completion(&sbi->s_kobj_unregister);
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}
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}
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int __init erofs_init_sysfs(void)
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{
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int ret;
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kobject_set_name(&erofs_root.kobj, "erofs");
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erofs_root.kobj.parent = fs_kobj;
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ret = kset_register(&erofs_root);
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if (ret)
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goto root_err;
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ret = kobject_init_and_add(&erofs_feat, &erofs_feat_ktype,
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NULL, "features");
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if (ret)
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goto feat_err;
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return ret;
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feat_err:
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kobject_put(&erofs_feat);
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kset_unregister(&erofs_root);
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root_err:
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return ret;
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}
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void erofs_exit_sysfs(void)
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{
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kobject_put(&erofs_feat);
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kset_unregister(&erofs_root);
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}
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