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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 | // SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2008 Red Hat, Inc. All rights reserved. * * This file is released under the GPL. */ #include <linux/sysfs.h> #include <linux/dm-ioctl.h> #include "dm-core.h" #include "dm-rq.h" struct dm_sysfs_attr { struct attribute attr; ssize_t (*show)(struct mapped_device *md, char *p); ssize_t (*store)(struct mapped_device *md, const char *p, size_t count); }; #define DM_ATTR_RO(_name) \ struct dm_sysfs_attr dm_attr_##_name = \ __ATTR(_name, 0444, dm_attr_##_name##_show, NULL) static ssize_t dm_attr_show(struct kobject *kobj, struct attribute *attr, char *page) { struct dm_sysfs_attr *dm_attr; struct mapped_device *md; ssize_t ret; dm_attr = container_of(attr, struct dm_sysfs_attr, attr); if (!dm_attr->show) return -EIO; md = dm_get_from_kobject(kobj); if (!md) return -EINVAL; ret = dm_attr->show(md, page); dm_put(md); return ret; } #define DM_ATTR_RW(_name) \ struct dm_sysfs_attr dm_attr_##_name = \ __ATTR(_name, 0644, dm_attr_##_name##_show, dm_attr_##_name##_store) static ssize_t dm_attr_store(struct kobject *kobj, struct attribute *attr, const char *page, size_t count) { struct dm_sysfs_attr *dm_attr; struct mapped_device *md; ssize_t ret; dm_attr = container_of(attr, struct dm_sysfs_attr, attr); if (!dm_attr->store) return -EIO; md = dm_get_from_kobject(kobj); if (!md) return -EINVAL; ret = dm_attr->store(md, page, count); dm_put(md); return ret; } static ssize_t dm_attr_name_show(struct mapped_device *md, char *buf) { if (dm_copy_name_and_uuid(md, buf, NULL)) return -EIO; strcat(buf, "\n"); return strlen(buf); } static ssize_t dm_attr_uuid_show(struct mapped_device *md, char *buf) { if (dm_copy_name_and_uuid(md, NULL, buf)) return -EIO; strcat(buf, "\n"); return strlen(buf); } static ssize_t dm_attr_suspended_show(struct mapped_device *md, char *buf) { sprintf(buf, "%d\n", dm_suspended_md(md)); return strlen(buf); } static ssize_t dm_attr_use_blk_mq_show(struct mapped_device *md, char *buf) { /* Purely for userspace compatibility */ sprintf(buf, "%d\n", true); return strlen(buf); } static DM_ATTR_RO(name); static DM_ATTR_RO(uuid); static DM_ATTR_RO(suspended); static DM_ATTR_RO(use_blk_mq); static DM_ATTR_RW(rq_based_seq_io_merge_deadline); static struct attribute *dm_attrs[] = { &dm_attr_name.attr, &dm_attr_uuid.attr, &dm_attr_suspended.attr, &dm_attr_use_blk_mq.attr, &dm_attr_rq_based_seq_io_merge_deadline.attr, NULL, }; ATTRIBUTE_GROUPS(dm); static const struct sysfs_ops dm_sysfs_ops = { .show = dm_attr_show, .store = dm_attr_store, }; static const struct kobj_type dm_ktype = { .sysfs_ops = &dm_sysfs_ops, .default_groups = dm_groups, .release = dm_kobject_release, }; /* * Initialize kobj * because nobody using md yet, no need to call explicit dm_get/put */ int dm_sysfs_init(struct mapped_device *md) { return kobject_init_and_add(dm_kobject(md), &dm_ktype, &disk_to_dev(dm_disk(md))->kobj, "%s", "dm"); } /* * Remove kobj, called after all references removed */ void dm_sysfs_exit(struct mapped_device *md) { struct kobject *kobj = dm_kobject(md); kobject_put(kobj); wait_for_completion(dm_get_completion_from_kobject(kobj)); } |