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- /*
- * Copyright (C) 2015 IT University of Copenhagen. All rights reserved.
- * Initial release: Matias Bjorling <m@bjorling.me>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License version
- * 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING. If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
- * USA.
- *
- */
- #include <linux/blkdev.h>
- #include <linux/blk-mq.h>
- #include <linux/list.h>
- #include <linux/types.h>
- #include <linux/sem.h>
- #include <linux/bitmap.h>
- #include <linux/module.h>
- #include <linux/miscdevice.h>
- #include <linux/lightnvm.h>
- #include <uapi/linux/lightnvm.h>
- static LIST_HEAD(nvm_targets);
- static LIST_HEAD(nvm_mgrs);
- static LIST_HEAD(nvm_devices);
- static DECLARE_RWSEM(nvm_lock);
- static struct nvm_tgt_type *nvm_find_target_type(const char *name)
- {
- struct nvm_tgt_type *tt;
- list_for_each_entry(tt, &nvm_targets, list)
- if (!strcmp(name, tt->name))
- return tt;
- return NULL;
- }
- int nvm_register_target(struct nvm_tgt_type *tt)
- {
- int ret = 0;
- down_write(&nvm_lock);
- if (nvm_find_target_type(tt->name))
- ret = -EEXIST;
- else
- list_add(&tt->list, &nvm_targets);
- up_write(&nvm_lock);
- return ret;
- }
- EXPORT_SYMBOL(nvm_register_target);
- void nvm_unregister_target(struct nvm_tgt_type *tt)
- {
- if (!tt)
- return;
- down_write(&nvm_lock);
- list_del(&tt->list);
- up_write(&nvm_lock);
- }
- EXPORT_SYMBOL(nvm_unregister_target);
- void *nvm_dev_dma_alloc(struct nvm_dev *dev, gfp_t mem_flags,
- dma_addr_t *dma_handler)
- {
- return dev->ops->dev_dma_alloc(dev, dev->ppalist_pool, mem_flags,
- dma_handler);
- }
- EXPORT_SYMBOL(nvm_dev_dma_alloc);
- void nvm_dev_dma_free(struct nvm_dev *dev, void *ppa_list,
- dma_addr_t dma_handler)
- {
- dev->ops->dev_dma_free(dev->ppalist_pool, ppa_list, dma_handler);
- }
- EXPORT_SYMBOL(nvm_dev_dma_free);
- static struct nvmm_type *nvm_find_mgr_type(const char *name)
- {
- struct nvmm_type *mt;
- list_for_each_entry(mt, &nvm_mgrs, list)
- if (!strcmp(name, mt->name))
- return mt;
- return NULL;
- }
- struct nvmm_type *nvm_init_mgr(struct nvm_dev *dev)
- {
- struct nvmm_type *mt;
- int ret;
- lockdep_assert_held(&nvm_lock);
- list_for_each_entry(mt, &nvm_mgrs, list) {
- ret = mt->register_mgr(dev);
- if (ret < 0) {
- pr_err("nvm: media mgr failed to init (%d) on dev %s\n",
- ret, dev->name);
- return NULL; /* initialization failed */
- } else if (ret > 0)
- return mt;
- }
- return NULL;
- }
- int nvm_register_mgr(struct nvmm_type *mt)
- {
- struct nvm_dev *dev;
- int ret = 0;
- down_write(&nvm_lock);
- if (nvm_find_mgr_type(mt->name)) {
- ret = -EEXIST;
- goto finish;
- } else {
- list_add(&mt->list, &nvm_mgrs);
- }
- /* try to register media mgr if any device have none configured */
- list_for_each_entry(dev, &nvm_devices, devices) {
- if (dev->mt)
- continue;
- dev->mt = nvm_init_mgr(dev);
- }
- finish:
- up_write(&nvm_lock);
- return ret;
- }
- EXPORT_SYMBOL(nvm_register_mgr);
- void nvm_unregister_mgr(struct nvmm_type *mt)
- {
- if (!mt)
- return;
- down_write(&nvm_lock);
- list_del(&mt->list);
- up_write(&nvm_lock);
- }
- EXPORT_SYMBOL(nvm_unregister_mgr);
- static struct nvm_dev *nvm_find_nvm_dev(const char *name)
- {
- struct nvm_dev *dev;
- list_for_each_entry(dev, &nvm_devices, devices)
- if (!strcmp(name, dev->name))
- return dev;
- return NULL;
- }
- struct nvm_block *nvm_get_blk(struct nvm_dev *dev, struct nvm_lun *lun,
- unsigned long flags)
- {
- return dev->mt->get_blk(dev, lun, flags);
- }
- EXPORT_SYMBOL(nvm_get_blk);
- /* Assumes that all valid pages have already been moved on release to bm */
- void nvm_put_blk(struct nvm_dev *dev, struct nvm_block *blk)
- {
- return dev->mt->put_blk(dev, blk);
- }
- EXPORT_SYMBOL(nvm_put_blk);
- int nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
- {
- return dev->mt->submit_io(dev, rqd);
- }
- EXPORT_SYMBOL(nvm_submit_io);
- int nvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk)
- {
- return dev->mt->erase_blk(dev, blk, 0);
- }
- EXPORT_SYMBOL(nvm_erase_blk);
- static int nvm_core_init(struct nvm_dev *dev)
- {
- struct nvm_id *id = &dev->identity;
- struct nvm_id_group *grp = &id->groups[0];
- /* device values */
- dev->nr_chnls = grp->num_ch;
- dev->luns_per_chnl = grp->num_lun;
- dev->pgs_per_blk = grp->num_pg;
- dev->blks_per_lun = grp->num_blk;
- dev->nr_planes = grp->num_pln;
- dev->sec_size = grp->csecs;
- dev->oob_size = grp->sos;
- dev->sec_per_pg = grp->fpg_sz / grp->csecs;
- memcpy(&dev->ppaf, &id->ppaf, sizeof(struct nvm_addr_format));
- dev->plane_mode = NVM_PLANE_SINGLE;
- dev->max_rq_size = dev->ops->max_phys_sect * dev->sec_size;
- if (grp->mtype != 0) {
- pr_err("nvm: memory type not supported\n");
- return -EINVAL;
- }
- if (grp->fmtype != 0 && grp->fmtype != 1) {
- pr_err("nvm: flash type not supported\n");
- return -EINVAL;
- }
- if (grp->mpos & 0x020202)
- dev->plane_mode = NVM_PLANE_DOUBLE;
- if (grp->mpos & 0x040404)
- dev->plane_mode = NVM_PLANE_QUAD;
- /* calculated values */
- dev->sec_per_pl = dev->sec_per_pg * dev->nr_planes;
- dev->sec_per_blk = dev->sec_per_pl * dev->pgs_per_blk;
- dev->sec_per_lun = dev->sec_per_blk * dev->blks_per_lun;
- dev->nr_luns = dev->luns_per_chnl * dev->nr_chnls;
- dev->total_blocks = dev->nr_planes *
- dev->blks_per_lun *
- dev->luns_per_chnl *
- dev->nr_chnls;
- dev->total_pages = dev->total_blocks * dev->pgs_per_blk;
- INIT_LIST_HEAD(&dev->online_targets);
- return 0;
- }
- static void nvm_free(struct nvm_dev *dev)
- {
- if (!dev)
- return;
- if (dev->mt)
- dev->mt->unregister_mgr(dev);
- }
- static int nvm_init(struct nvm_dev *dev)
- {
- int ret = -EINVAL;
- if (!dev->q || !dev->ops)
- return ret;
- if (dev->ops->identity(dev, &dev->identity)) {
- pr_err("nvm: device could not be identified\n");
- goto err;
- }
- pr_debug("nvm: ver:%x nvm_vendor:%x groups:%u\n",
- dev->identity.ver_id, dev->identity.vmnt,
- dev->identity.cgrps);
- if (dev->identity.ver_id != 1) {
- pr_err("nvm: device not supported by kernel.");
- goto err;
- }
- if (dev->identity.cgrps != 1) {
- pr_err("nvm: only one group configuration supported.");
- goto err;
- }
- ret = nvm_core_init(dev);
- if (ret) {
- pr_err("nvm: could not initialize core structures.\n");
- goto err;
- }
- pr_info("nvm: registered %s [%u/%u/%u/%u/%u/%u]\n",
- dev->name, dev->sec_per_pg, dev->nr_planes,
- dev->pgs_per_blk, dev->blks_per_lun, dev->nr_luns,
- dev->nr_chnls);
- return 0;
- err:
- pr_err("nvm: failed to initialize nvm\n");
- return ret;
- }
- static void nvm_exit(struct nvm_dev *dev)
- {
- if (dev->ppalist_pool)
- dev->ops->destroy_dma_pool(dev->ppalist_pool);
- nvm_free(dev);
- pr_info("nvm: successfully unloaded\n");
- }
- int nvm_register(struct request_queue *q, char *disk_name,
- struct nvm_dev_ops *ops)
- {
- struct nvm_dev *dev;
- int ret;
- if (!ops->identity)
- return -EINVAL;
- dev = kzalloc(sizeof(struct nvm_dev), GFP_KERNEL);
- if (!dev)
- return -ENOMEM;
- dev->q = q;
- dev->ops = ops;
- strncpy(dev->name, disk_name, DISK_NAME_LEN);
- ret = nvm_init(dev);
- if (ret)
- goto err_init;
- if (dev->ops->max_phys_sect > 256) {
- pr_info("nvm: max sectors supported is 256.\n");
- ret = -EINVAL;
- goto err_init;
- }
- if (dev->ops->max_phys_sect > 1) {
- dev->ppalist_pool = dev->ops->create_dma_pool(dev, "ppalist");
- if (!dev->ppalist_pool) {
- pr_err("nvm: could not create ppa pool\n");
- ret = -ENOMEM;
- goto err_init;
- }
- }
- /* register device with a supported media manager */
- down_write(&nvm_lock);
- dev->mt = nvm_init_mgr(dev);
- list_add(&dev->devices, &nvm_devices);
- up_write(&nvm_lock);
- return 0;
- err_init:
- kfree(dev);
- return ret;
- }
- EXPORT_SYMBOL(nvm_register);
- void nvm_unregister(char *disk_name)
- {
- struct nvm_dev *dev;
- down_write(&nvm_lock);
- dev = nvm_find_nvm_dev(disk_name);
- if (!dev) {
- pr_err("nvm: could not find device %s to unregister\n",
- disk_name);
- up_write(&nvm_lock);
- return;
- }
- list_del(&dev->devices);
- up_write(&nvm_lock);
- nvm_exit(dev);
- kfree(dev);
- }
- EXPORT_SYMBOL(nvm_unregister);
- static const struct block_device_operations nvm_fops = {
- .owner = THIS_MODULE,
- };
- static int nvm_create_target(struct nvm_dev *dev,
- struct nvm_ioctl_create *create)
- {
- struct nvm_ioctl_create_simple *s = &create->conf.s;
- struct request_queue *tqueue;
- struct gendisk *tdisk;
- struct nvm_tgt_type *tt;
- struct nvm_target *t;
- void *targetdata;
- if (!dev->mt) {
- pr_info("nvm: device has no media manager registered.\n");
- return -ENODEV;
- }
- down_write(&nvm_lock);
- tt = nvm_find_target_type(create->tgttype);
- if (!tt) {
- pr_err("nvm: target type %s not found\n", create->tgttype);
- up_write(&nvm_lock);
- return -EINVAL;
- }
- list_for_each_entry(t, &dev->online_targets, list) {
- if (!strcmp(create->tgtname, t->disk->disk_name)) {
- pr_err("nvm: target name already exists.\n");
- up_write(&nvm_lock);
- return -EINVAL;
- }
- }
- up_write(&nvm_lock);
- t = kmalloc(sizeof(struct nvm_target), GFP_KERNEL);
- if (!t)
- return -ENOMEM;
- tqueue = blk_alloc_queue_node(GFP_KERNEL, dev->q->node);
- if (!tqueue)
- goto err_t;
- blk_queue_make_request(tqueue, tt->make_rq);
- tdisk = alloc_disk(0);
- if (!tdisk)
- goto err_queue;
- sprintf(tdisk->disk_name, "%s", create->tgtname);
- tdisk->flags = GENHD_FL_EXT_DEVT;
- tdisk->major = 0;
- tdisk->first_minor = 0;
- tdisk->fops = &nvm_fops;
- tdisk->queue = tqueue;
- targetdata = tt->init(dev, tdisk, s->lun_begin, s->lun_end);
- if (IS_ERR(targetdata))
- goto err_init;
- tdisk->private_data = targetdata;
- tqueue->queuedata = targetdata;
- blk_queue_max_hw_sectors(tqueue, 8 * dev->ops->max_phys_sect);
- set_capacity(tdisk, tt->capacity(targetdata));
- add_disk(tdisk);
- t->type = tt;
- t->disk = tdisk;
- down_write(&nvm_lock);
- list_add_tail(&t->list, &dev->online_targets);
- up_write(&nvm_lock);
- return 0;
- err_init:
- put_disk(tdisk);
- err_queue:
- blk_cleanup_queue(tqueue);
- err_t:
- kfree(t);
- return -ENOMEM;
- }
- static void nvm_remove_target(struct nvm_target *t)
- {
- struct nvm_tgt_type *tt = t->type;
- struct gendisk *tdisk = t->disk;
- struct request_queue *q = tdisk->queue;
- lockdep_assert_held(&nvm_lock);
- del_gendisk(tdisk);
- blk_cleanup_queue(q);
- if (tt->exit)
- tt->exit(tdisk->private_data);
- put_disk(tdisk);
- list_del(&t->list);
- kfree(t);
- }
- static int __nvm_configure_create(struct nvm_ioctl_create *create)
- {
- struct nvm_dev *dev;
- struct nvm_ioctl_create_simple *s;
- down_write(&nvm_lock);
- dev = nvm_find_nvm_dev(create->dev);
- up_write(&nvm_lock);
- if (!dev) {
- pr_err("nvm: device not found\n");
- return -EINVAL;
- }
- if (create->conf.type != NVM_CONFIG_TYPE_SIMPLE) {
- pr_err("nvm: config type not valid\n");
- return -EINVAL;
- }
- s = &create->conf.s;
- if (s->lun_begin > s->lun_end || s->lun_end > dev->nr_luns) {
- pr_err("nvm: lun out of bound (%u:%u > %u)\n",
- s->lun_begin, s->lun_end, dev->nr_luns);
- return -EINVAL;
- }
- return nvm_create_target(dev, create);
- }
- static int __nvm_configure_remove(struct nvm_ioctl_remove *remove)
- {
- struct nvm_target *t = NULL;
- struct nvm_dev *dev;
- int ret = -1;
- down_write(&nvm_lock);
- list_for_each_entry(dev, &nvm_devices, devices)
- list_for_each_entry(t, &dev->online_targets, list) {
- if (!strcmp(remove->tgtname, t->disk->disk_name)) {
- nvm_remove_target(t);
- ret = 0;
- break;
- }
- }
- up_write(&nvm_lock);
- if (ret) {
- pr_err("nvm: target \"%s\" doesn't exist.\n", remove->tgtname);
- return -EINVAL;
- }
- return 0;
- }
- #ifdef CONFIG_NVM_DEBUG
- static int nvm_configure_show(const char *val)
- {
- struct nvm_dev *dev;
- char opcode, devname[DISK_NAME_LEN];
- int ret;
- ret = sscanf(val, "%c %32s", &opcode, devname);
- if (ret != 2) {
- pr_err("nvm: invalid command. Use \"opcode devicename\".\n");
- return -EINVAL;
- }
- down_write(&nvm_lock);
- dev = nvm_find_nvm_dev(devname);
- up_write(&nvm_lock);
- if (!dev) {
- pr_err("nvm: device not found\n");
- return -EINVAL;
- }
- if (!dev->mt)
- return 0;
- dev->mt->lun_info_print(dev);
- return 0;
- }
- static int nvm_configure_remove(const char *val)
- {
- struct nvm_ioctl_remove remove;
- char opcode;
- int ret;
- ret = sscanf(val, "%c %256s", &opcode, remove.tgtname);
- if (ret != 2) {
- pr_err("nvm: invalid command. Use \"d targetname\".\n");
- return -EINVAL;
- }
- remove.flags = 0;
- return __nvm_configure_remove(&remove);
- }
- static int nvm_configure_create(const char *val)
- {
- struct nvm_ioctl_create create;
- char opcode;
- int lun_begin, lun_end, ret;
- ret = sscanf(val, "%c %256s %256s %48s %u:%u", &opcode, create.dev,
- create.tgtname, create.tgttype,
- &lun_begin, &lun_end);
- if (ret != 6) {
- pr_err("nvm: invalid command. Use \"opcode device name tgttype lun_begin:lun_end\".\n");
- return -EINVAL;
- }
- create.flags = 0;
- create.conf.type = NVM_CONFIG_TYPE_SIMPLE;
- create.conf.s.lun_begin = lun_begin;
- create.conf.s.lun_end = lun_end;
- return __nvm_configure_create(&create);
- }
- /* Exposes administrative interface through /sys/module/lnvm/configure_by_str */
- static int nvm_configure_by_str_event(const char *val,
- const struct kernel_param *kp)
- {
- char opcode;
- int ret;
- ret = sscanf(val, "%c", &opcode);
- if (ret != 1) {
- pr_err("nvm: string must have the format of \"cmd ...\"\n");
- return -EINVAL;
- }
- switch (opcode) {
- case 'a':
- return nvm_configure_create(val);
- case 'd':
- return nvm_configure_remove(val);
- case 's':
- return nvm_configure_show(val);
- default:
- pr_err("nvm: invalid command\n");
- return -EINVAL;
- }
- return 0;
- }
- static int nvm_configure_get(char *buf, const struct kernel_param *kp)
- {
- int sz = 0;
- char *buf_start = buf;
- struct nvm_dev *dev;
- buf += sprintf(buf, "available devices:\n");
- down_write(&nvm_lock);
- list_for_each_entry(dev, &nvm_devices, devices) {
- if (sz > 4095 - DISK_NAME_LEN)
- break;
- buf += sprintf(buf, " %32s\n", dev->name);
- }
- up_write(&nvm_lock);
- return buf - buf_start - 1;
- }
- static const struct kernel_param_ops nvm_configure_by_str_event_param_ops = {
- .set = nvm_configure_by_str_event,
- .get = nvm_configure_get,
- };
- #undef MODULE_PARAM_PREFIX
- #define MODULE_PARAM_PREFIX "lnvm."
- module_param_cb(configure_debug, &nvm_configure_by_str_event_param_ops, NULL,
- 0644);
- #endif /* CONFIG_NVM_DEBUG */
- static long nvm_ioctl_info(struct file *file, void __user *arg)
- {
- struct nvm_ioctl_info *info;
- struct nvm_tgt_type *tt;
- int tgt_iter = 0;
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- info = memdup_user(arg, sizeof(struct nvm_ioctl_info));
- if (IS_ERR(info))
- return -EFAULT;
- info->version[0] = NVM_VERSION_MAJOR;
- info->version[1] = NVM_VERSION_MINOR;
- info->version[2] = NVM_VERSION_PATCH;
- down_write(&nvm_lock);
- list_for_each_entry(tt, &nvm_targets, list) {
- struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter];
- tgt->version[0] = tt->version[0];
- tgt->version[1] = tt->version[1];
- tgt->version[2] = tt->version[2];
- strncpy(tgt->tgtname, tt->name, NVM_TTYPE_NAME_MAX);
- tgt_iter++;
- }
- info->tgtsize = tgt_iter;
- up_write(&nvm_lock);
- if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) {
- kfree(info);
- return -EFAULT;
- }
- kfree(info);
- return 0;
- }
- static long nvm_ioctl_get_devices(struct file *file, void __user *arg)
- {
- struct nvm_ioctl_get_devices *devices;
- struct nvm_dev *dev;
- int i = 0;
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- devices = kzalloc(sizeof(struct nvm_ioctl_get_devices), GFP_KERNEL);
- if (!devices)
- return -ENOMEM;
- down_write(&nvm_lock);
- list_for_each_entry(dev, &nvm_devices, devices) {
- struct nvm_ioctl_device_info *info = &devices->info[i];
- sprintf(info->devname, "%s", dev->name);
- if (dev->mt) {
- info->bmversion[0] = dev->mt->version[0];
- info->bmversion[1] = dev->mt->version[1];
- info->bmversion[2] = dev->mt->version[2];
- sprintf(info->bmname, "%s", dev->mt->name);
- } else {
- sprintf(info->bmname, "none");
- }
- i++;
- if (i > 31) {
- pr_err("nvm: max 31 devices can be reported.\n");
- break;
- }
- }
- up_write(&nvm_lock);
- devices->nr_devices = i;
- if (copy_to_user(arg, devices,
- sizeof(struct nvm_ioctl_get_devices))) {
- kfree(devices);
- return -EFAULT;
- }
- kfree(devices);
- return 0;
- }
- static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
- {
- struct nvm_ioctl_create create;
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- if (copy_from_user(&create, arg, sizeof(struct nvm_ioctl_create)))
- return -EFAULT;
- create.dev[DISK_NAME_LEN - 1] = '\0';
- create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
- create.tgtname[DISK_NAME_LEN - 1] = '\0';
- if (create.flags != 0) {
- pr_err("nvm: no flags supported\n");
- return -EINVAL;
- }
- return __nvm_configure_create(&create);
- }
- static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
- {
- struct nvm_ioctl_remove remove;
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- if (copy_from_user(&remove, arg, sizeof(struct nvm_ioctl_remove)))
- return -EFAULT;
- remove.tgtname[DISK_NAME_LEN - 1] = '\0';
- if (remove.flags != 0) {
- pr_err("nvm: no flags supported\n");
- return -EINVAL;
- }
- return __nvm_configure_remove(&remove);
- }
- static long nvm_ctl_ioctl(struct file *file, uint cmd, unsigned long arg)
- {
- void __user *argp = (void __user *)arg;
- switch (cmd) {
- case NVM_INFO:
- return nvm_ioctl_info(file, argp);
- case NVM_GET_DEVICES:
- return nvm_ioctl_get_devices(file, argp);
- case NVM_DEV_CREATE:
- return nvm_ioctl_dev_create(file, argp);
- case NVM_DEV_REMOVE:
- return nvm_ioctl_dev_remove(file, argp);
- }
- return 0;
- }
- static const struct file_operations _ctl_fops = {
- .open = nonseekable_open,
- .unlocked_ioctl = nvm_ctl_ioctl,
- .owner = THIS_MODULE,
- .llseek = noop_llseek,
- };
- static struct miscdevice _nvm_misc = {
- .minor = MISC_DYNAMIC_MINOR,
- .name = "lightnvm",
- .nodename = "lightnvm/control",
- .fops = &_ctl_fops,
- };
- MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR);
- static int __init nvm_mod_init(void)
- {
- int ret;
- ret = misc_register(&_nvm_misc);
- if (ret)
- pr_err("nvm: misc_register failed for control device");
- return ret;
- }
- static void __exit nvm_mod_exit(void)
- {
- misc_deregister(&_nvm_misc);
- }
- MODULE_AUTHOR("Matias Bjorling <m@bjorling.me>");
- MODULE_LICENSE("GPL v2");
- MODULE_VERSION("0.1");
- module_init(nvm_mod_init);
- module_exit(nvm_mod_exit);
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