| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * gendisk handling |
| * |
| * Portions Copyright (C) 2020 Christoph Hellwig |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/ctype.h> |
| #include <linux/fs.h> |
| #include <linux/kdev_t.h> |
| #include <linux/kernel.h> |
| #include <linux/blkdev.h> |
| #include <linux/backing-dev.h> |
| #include <linux/init.h> |
| #include <linux/spinlock.h> |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/slab.h> |
| #include <linux/kmod.h> |
| #include <linux/major.h> |
| #include <linux/mutex.h> |
| #include <linux/idr.h> |
| #include <linux/log2.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/badblocks.h> |
| #include <linux/part_stat.h> |
| #include <linux/blktrace_api.h> |
| |
| #include "blk-throttle.h" |
| #include "blk.h" |
| #include "blk-mq-sched.h" |
| #include "blk-rq-qos.h" |
| #include "blk-cgroup.h" |
| |
| static struct kobject *block_depr; |
| |
| /* |
| * Unique, monotonically increasing sequential number associated with block |
| * devices instances (i.e. incremented each time a device is attached). |
| * Associating uevents with block devices in userspace is difficult and racy: |
| * the uevent netlink socket is lossy, and on slow and overloaded systems has |
| * a very high latency. |
| * Block devices do not have exclusive owners in userspace, any process can set |
| * one up (e.g. loop devices). Moreover, device names can be reused (e.g. loop0 |
| * can be reused again and again). |
| * A userspace process setting up a block device and watching for its events |
| * cannot thus reliably tell whether an event relates to the device it just set |
| * up or another earlier instance with the same name. |
| * This sequential number allows userspace processes to solve this problem, and |
| * uniquely associate an uevent to the lifetime to a device. |
| */ |
| static atomic64_t diskseq; |
| |
| /* for extended dynamic devt allocation, currently only one major is used */ |
| #define NR_EXT_DEVT (1 << MINORBITS) |
| static DEFINE_IDA(ext_devt_ida); |
| |
| void set_capacity(struct gendisk *disk, sector_t sectors) |
| { |
| struct block_device *bdev = disk->part0; |
| |
| spin_lock(&bdev->bd_size_lock); |
| i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT); |
| bdev->bd_nr_sectors = sectors; |
| spin_unlock(&bdev->bd_size_lock); |
| } |
| EXPORT_SYMBOL(set_capacity); |
| |
| /* |
| * Set disk capacity and notify if the size is not currently zero and will not |
| * be set to zero. Returns true if a uevent was sent, otherwise false. |
| */ |
| bool set_capacity_and_notify(struct gendisk *disk, sector_t size) |
| { |
| sector_t capacity = get_capacity(disk); |
| char *envp[] = { "RESIZE=1", NULL }; |
| |
| set_capacity(disk, size); |
| |
| /* |
| * Only print a message and send a uevent if the gendisk is user visible |
| * and alive. This avoids spamming the log and udev when setting the |
| * initial capacity during probing. |
| */ |
| if (size == capacity || |
| !disk_live(disk) || |
| (disk->flags & GENHD_FL_HIDDEN)) |
| return false; |
| |
| pr_info("%s: detected capacity change from %lld to %lld\n", |
| disk->disk_name, capacity, size); |
| |
| /* |
| * Historically we did not send a uevent for changes to/from an empty |
| * device. |
| */ |
| if (!capacity || !size) |
| return false; |
| kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp); |
| return true; |
| } |
| EXPORT_SYMBOL_GPL(set_capacity_and_notify); |
| |
| static void part_stat_read_all(struct block_device *part, |
| struct disk_stats *stat) |
| { |
| int cpu; |
| |
| memset(stat, 0, sizeof(struct disk_stats)); |
| for_each_possible_cpu(cpu) { |
| struct disk_stats *ptr = per_cpu_ptr(part->bd_stats, cpu); |
| int group; |
| |
| for (group = 0; group < NR_STAT_GROUPS; group++) { |
| stat->nsecs[group] += ptr->nsecs[group]; |
| stat->sectors[group] += ptr->sectors[group]; |
| stat->ios[group] += ptr->ios[group]; |
| stat->merges[group] += ptr->merges[group]; |
| } |
| |
| stat->io_ticks += ptr->io_ticks; |
| } |
| } |
| |
| static unsigned int part_in_flight(struct block_device *part) |
| { |
| unsigned int inflight = 0; |
| int cpu; |
| |
| for_each_possible_cpu(cpu) { |
| inflight += part_stat_local_read_cpu(part, in_flight[0], cpu) + |
| part_stat_local_read_cpu(part, in_flight[1], cpu); |
| } |
| if ((int)inflight < 0) |
| inflight = 0; |
| |
| return inflight; |
| } |
| |
| static void part_in_flight_rw(struct block_device *part, |
| unsigned int inflight[2]) |
| { |
| int cpu; |
| |
| inflight[0] = 0; |
| inflight[1] = 0; |
| for_each_possible_cpu(cpu) { |
| inflight[0] += part_stat_local_read_cpu(part, in_flight[0], cpu); |
| inflight[1] += part_stat_local_read_cpu(part, in_flight[1], cpu); |
| } |
| if ((int)inflight[0] < 0) |
| inflight[0] = 0; |
| if ((int)inflight[1] < 0) |
| inflight[1] = 0; |
| } |
| |
| /* |
| * Can be deleted altogether. Later. |
| * |
| */ |
| #define BLKDEV_MAJOR_HASH_SIZE 255 |
| static struct blk_major_name { |
| struct blk_major_name *next; |
| int major; |
| char name[16]; |
| #ifdef CONFIG_BLOCK_LEGACY_AUTOLOAD |
| void (*probe)(dev_t devt); |
| #endif |
| } *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
| static DEFINE_MUTEX(major_names_lock); |
| static DEFINE_SPINLOCK(major_names_spinlock); |
| |
| /* index in the above - for now: assume no multimajor ranges */ |
| static inline int major_to_index(unsigned major) |
| { |
| return major % BLKDEV_MAJOR_HASH_SIZE; |
| } |
| |
| #ifdef CONFIG_PROC_FS |
| void blkdev_show(struct seq_file *seqf, off_t offset) |
| { |
| struct blk_major_name *dp; |
| |
| spin_lock(&major_names_spinlock); |
| for (dp = major_names[major_to_index(offset)]; dp; dp = dp->next) |
| if (dp->major == offset) |
| seq_printf(seqf, "%3d %s\n", dp->major, dp->name); |
| spin_unlock(&major_names_spinlock); |
| } |
| #endif /* CONFIG_PROC_FS */ |
| |
| /** |
| * __register_blkdev - register a new block device |
| * |
| * @major: the requested major device number [1..BLKDEV_MAJOR_MAX-1]. If |
| * @major = 0, try to allocate any unused major number. |
| * @name: the name of the new block device as a zero terminated string |
| * @probe: pre-devtmpfs / pre-udev callback used to create disks when their |
| * pre-created device node is accessed. When a probe call uses |
| * add_disk() and it fails the driver must cleanup resources. This |
| * interface may soon be removed. |
| * |
| * The @name must be unique within the system. |
| * |
| * The return value depends on the @major input parameter: |
| * |
| * - if a major device number was requested in range [1..BLKDEV_MAJOR_MAX-1] |
| * then the function returns zero on success, or a negative error code |
| * - if any unused major number was requested with @major = 0 parameter |
| * then the return value is the allocated major number in range |
| * [1..BLKDEV_MAJOR_MAX-1] or a negative error code otherwise |
| * |
| * See Documentation/admin-guide/devices.txt for the list of allocated |
| * major numbers. |
| * |
| * Use register_blkdev instead for any new code. |
| */ |
| int __register_blkdev(unsigned int major, const char *name, |
| void (*probe)(dev_t devt)) |
| { |
| struct blk_major_name **n, *p; |
| int index, ret = 0; |
| |
| mutex_lock(&major_names_lock); |
| |
| /* temporary */ |
| if (major == 0) { |
| for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { |
| if (major_names[index] == NULL) |
| break; |
| } |
| |
| if (index == 0) { |
| printk("%s: failed to get major for %s\n", |
| __func__, name); |
| ret = -EBUSY; |
| goto out; |
| } |
| major = index; |
| ret = major; |
| } |
| |
| if (major >= BLKDEV_MAJOR_MAX) { |
| pr_err("%s: major requested (%u) is greater than the maximum (%u) for %s\n", |
| __func__, major, BLKDEV_MAJOR_MAX-1, name); |
| |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); |
| if (p == NULL) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| p->major = major; |
| #ifdef CONFIG_BLOCK_LEGACY_AUTOLOAD |
| p->probe = probe; |
| #endif |
| strlcpy(p->name, name, sizeof(p->name)); |
| p->next = NULL; |
| index = major_to_index(major); |
| |
| spin_lock(&major_names_spinlock); |
| for (n = &major_names[index]; *n; n = &(*n)->next) { |
| if ((*n)->major == major) |
| break; |
| } |
| if (!*n) |
| *n = p; |
| else |
| ret = -EBUSY; |
| spin_unlock(&major_names_spinlock); |
| |
| if (ret < 0) { |
| printk("register_blkdev: cannot get major %u for %s\n", |
| major, name); |
| kfree(p); |
| } |
| out: |
| mutex_unlock(&major_names_lock); |
| return ret; |
| } |
| EXPORT_SYMBOL(__register_blkdev); |
| |
| void unregister_blkdev(unsigned int major, const char *name) |
| { |
| struct blk_major_name **n; |
| struct blk_major_name *p = NULL; |
| int index = major_to_index(major); |
| |
| mutex_lock(&major_names_lock); |
| spin_lock(&major_names_spinlock); |
| for (n = &major_names[index]; *n; n = &(*n)->next) |
| if ((*n)->major == major) |
| break; |
| if (!*n || strcmp((*n)->name, name)) { |
| WARN_ON(1); |
| } else { |
| p = *n; |
| *n = p->next; |
| } |
| spin_unlock(&major_names_spinlock); |
| mutex_unlock(&major_names_lock); |
| kfree(p); |
| } |
| |
| EXPORT_SYMBOL(unregister_blkdev); |
| |
| int blk_alloc_ext_minor(void) |
| { |
| int idx; |
| |
| idx = ida_alloc_range(&ext_devt_ida, 0, NR_EXT_DEVT - 1, GFP_KERNEL); |
| if (idx == -ENOSPC) |
| return -EBUSY; |
| return idx; |
| } |
| |
| void blk_free_ext_minor(unsigned int minor) |
| { |
| ida_free(&ext_devt_ida, minor); |
| } |
| |
| static char *bdevt_str(dev_t devt, char *buf) |
| { |
| if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) { |
| char tbuf[BDEVT_SIZE]; |
| snprintf(tbuf, BDEVT_SIZE, "%02x%02x", MAJOR(devt), MINOR(devt)); |
| snprintf(buf, BDEVT_SIZE, "%-9s", tbuf); |
| } else |
| snprintf(buf, BDEVT_SIZE, "%03x:%05x", MAJOR(devt), MINOR(devt)); |
| |
| return buf; |
| } |
| |
| void disk_uevent(struct gendisk *disk, enum kobject_action action) |
| { |
| struct block_device *part; |
| unsigned long idx; |
| |
| rcu_read_lock(); |
| xa_for_each(&disk->part_tbl, idx, part) { |
| if (bdev_is_partition(part) && !bdev_nr_sectors(part)) |
| continue; |
| if (!kobject_get_unless_zero(&part->bd_device.kobj)) |
| continue; |
| |
| rcu_read_unlock(); |
| kobject_uevent(bdev_kobj(part), action); |
| put_device(&part->bd_device); |
| rcu_read_lock(); |
| } |
| rcu_read_unlock(); |
| } |
| EXPORT_SYMBOL_GPL(disk_uevent); |
| |
| int disk_scan_partitions(struct gendisk *disk, fmode_t mode) |
| { |
| struct block_device *bdev; |
| int ret = 0; |
| |
| if (disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN)) |
| return -EINVAL; |
| if (test_bit(GD_SUPPRESS_PART_SCAN, &disk->state)) |
| return -EINVAL; |
| if (disk->open_partitions) |
| return -EBUSY; |
| |
| /* |
| * If the device is opened exclusively by current thread already, it's |
| * safe to scan partitons, otherwise, use bd_prepare_to_claim() to |
| * synchronize with other exclusive openers and other partition |
| * scanners. |
| */ |
| if (!(mode & FMODE_EXCL)) { |
| ret = bd_prepare_to_claim(disk->part0, disk_scan_partitions); |
| if (ret) |
| return ret; |
| } |
| |
| set_bit(GD_NEED_PART_SCAN, &disk->state); |
| bdev = blkdev_get_by_dev(disk_devt(disk), mode & ~FMODE_EXCL, NULL); |
| if (IS_ERR(bdev)) |
| ret = PTR_ERR(bdev); |
| else |
| blkdev_put(bdev, mode & ~FMODE_EXCL); |
| |
| /* |
| * If blkdev_get_by_dev() failed early, GD_NEED_PART_SCAN is still set, |
| * and this will cause that re-assemble partitioned raid device will |
| * creat partition for underlying disk. |
| */ |
| clear_bit(GD_NEED_PART_SCAN, &disk->state); |
| if (!(mode & FMODE_EXCL)) |
| bd_abort_claiming(disk->part0, disk_scan_partitions); |
| return ret; |
| } |
| |
| /** |
| * device_add_disk - add disk information to kernel list |
| * @parent: parent device for the disk |
| * @disk: per-device partitioning information |
| * @groups: Additional per-device sysfs groups |
| * |
| * This function registers the partitioning information in @disk |
| * with the kernel. |
| */ |
| int __must_check device_add_disk(struct device *parent, struct gendisk *disk, |
| const struct attribute_group **groups) |
| |
| { |
| struct device *ddev = disk_to_dev(disk); |
| int ret; |
| |
| /* Only makes sense for bio-based to set ->poll_bio */ |
| if (queue_is_mq(disk->queue) && disk->fops->poll_bio) |
| return -EINVAL; |
| |
| /* |
| * The disk queue should now be all set with enough information about |
| * the device for the elevator code to pick an adequate default |
| * elevator if one is needed, that is, for devices requesting queue |
| * registration. |
| */ |
| elevator_init_mq(disk->queue); |
| |
| /* |
| * If the driver provides an explicit major number it also must provide |
| * the number of minors numbers supported, and those will be used to |
| * setup the gendisk. |
| * Otherwise just allocate the device numbers for both the whole device |
| * and all partitions from the extended dev_t space. |
| */ |
| ret = -EINVAL; |
| if (disk->major) { |
| if (WARN_ON(!disk->minors)) |
| goto out_exit_elevator; |
| |
| if (disk->minors > DISK_MAX_PARTS) { |
| pr_err("block: can't allocate more than %d partitions\n", |
| DISK_MAX_PARTS); |
| disk->minors = DISK_MAX_PARTS; |
| } |
| if (disk->first_minor + disk->minors > MINORMASK + 1) |
| goto out_exit_elevator; |
| } else { |
| if (WARN_ON(disk->minors)) |
| goto out_exit_elevator; |
| |
| ret = blk_alloc_ext_minor(); |
| if (ret < 0) |
| goto out_exit_elevator; |
| disk->major = BLOCK_EXT_MAJOR; |
| disk->first_minor = ret; |
| } |
| |
| /* delay uevents, until we scanned partition table */ |
| dev_set_uevent_suppress(ddev, 1); |
| |
| ddev->parent = parent; |
| ddev->groups = groups; |
| dev_set_name(ddev, "%s", disk->disk_name); |
| if (!(disk->flags & GENHD_FL_HIDDEN)) |
| ddev->devt = MKDEV(disk->major, disk->first_minor); |
| ret = device_add(ddev); |
| if (ret) |
| goto out_free_ext_minor; |
| |
| ret = disk_alloc_events(disk); |
| if (ret) |
| goto out_device_del; |
| |
| if (!sysfs_deprecated) { |
| ret = sysfs_create_link(block_depr, &ddev->kobj, |
| kobject_name(&ddev->kobj)); |
| if (ret) |
| goto out_device_del; |
| } |
| |
| /* |
| * avoid probable deadlock caused by allocating memory with |
| * GFP_KERNEL in runtime_resume callback of its all ancestor |
| * devices |
| */ |
| pm_runtime_set_memalloc_noio(ddev, true); |
| |
| ret = blk_integrity_add(disk); |
| if (ret) |
| goto out_del_block_link; |
| |
| disk->part0->bd_holder_dir = |
| kobject_create_and_add("holders", &ddev->kobj); |
| if (!disk->part0->bd_holder_dir) { |
| ret = -ENOMEM; |
| goto out_del_integrity; |
| } |
| disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); |
| if (!disk->slave_dir) { |
| ret = -ENOMEM; |
| goto out_put_holder_dir; |
| } |
| |
| ret = bd_register_pending_holders(disk); |
| if (ret < 0) |
| goto out_put_slave_dir; |
| |
| ret = blk_register_queue(disk); |
| if (ret) |
| goto out_put_slave_dir; |
| |
| if (!(disk->flags & GENHD_FL_HIDDEN)) { |
| ret = bdi_register(disk->bdi, "%u:%u", |
| disk->major, disk->first_minor); |
| if (ret) |
| goto out_unregister_queue; |
| bdi_set_owner(disk->bdi, ddev); |
| ret = sysfs_create_link(&ddev->kobj, |
| &disk->bdi->dev->kobj, "bdi"); |
| if (ret) |
| goto out_unregister_bdi; |
| |
| /* Make sure the first partition scan will be proceed */ |
| if (get_capacity(disk) && !(disk->flags & GENHD_FL_NO_PART) && |
| !test_bit(GD_SUPPRESS_PART_SCAN, &disk->state)) |
| set_bit(GD_NEED_PART_SCAN, &disk->state); |
| |
| bdev_add(disk->part0, ddev->devt); |
| if (get_capacity(disk)) |
| disk_scan_partitions(disk, FMODE_READ); |
| |
| /* |
| * Announce the disk and partitions after all partitions are |
| * created. (for hidden disks uevents remain suppressed forever) |
| */ |
| dev_set_uevent_suppress(ddev, 0); |
| disk_uevent(disk, KOBJ_ADD); |
| } else { |
| /* |
| * Even if the block_device for a hidden gendisk is not |
| * registered, it needs to have a valid bd_dev so that the |
| * freeing of the dynamic major works. |
| */ |
| disk->part0->bd_dev = MKDEV(disk->major, disk->first_minor); |
| } |
| |
| disk_update_readahead(disk); |
| disk_add_events(disk); |
| set_bit(GD_ADDED, &disk->state); |
| return 0; |
| |
| out_unregister_bdi: |
| if (!(disk->flags & GENHD_FL_HIDDEN)) |
| bdi_unregister(disk->bdi); |
| out_unregister_queue: |
| blk_unregister_queue(disk); |
| rq_qos_exit(disk->queue); |
| out_put_slave_dir: |
| kobject_put(disk->slave_dir); |
| disk->slave_dir = NULL; |
| out_put_holder_dir: |
| kobject_put(disk->part0->bd_holder_dir); |
| out_del_integrity: |
| blk_integrity_del(disk); |
| out_del_block_link: |
| if (!sysfs_deprecated) |
| sysfs_remove_link(block_depr, dev_name(ddev)); |
| out_device_del: |
| device_del(ddev); |
| out_free_ext_minor: |
| if (disk->major == BLOCK_EXT_MAJOR) |
| blk_free_ext_minor(disk->first_minor); |
| out_exit_elevator: |
| if (disk->queue->elevator) |
| elevator_exit(disk->queue); |
| return ret; |
| } |
| EXPORT_SYMBOL(device_add_disk); |
| |
| /** |
| * blk_mark_disk_dead - mark a disk as dead |
| * @disk: disk to mark as dead |
| * |
| * Mark as disk as dead (e.g. surprise removed) and don't accept any new I/O |
| * to this disk. |
| */ |
| void blk_mark_disk_dead(struct gendisk *disk) |
| { |
| set_bit(GD_DEAD, &disk->state); |
| blk_queue_start_drain(disk->queue); |
| } |
| EXPORT_SYMBOL_GPL(blk_mark_disk_dead); |
| |
| /** |
| * del_gendisk - remove the gendisk |
| * @disk: the struct gendisk to remove |
| * |
| * Removes the gendisk and all its associated resources. This deletes the |
| * partitions associated with the gendisk, and unregisters the associated |
| * request_queue. |
| * |
| * This is the counter to the respective __device_add_disk() call. |
| * |
| * The final removal of the struct gendisk happens when its refcount reaches 0 |
| * with put_disk(), which should be called after del_gendisk(), if |
| * __device_add_disk() was used. |
| * |
| * Drivers exist which depend on the release of the gendisk to be synchronous, |
| * it should not be deferred. |
| * |
| * Context: can sleep |
| */ |
| void del_gendisk(struct gendisk *disk) |
| { |
| struct request_queue *q = disk->queue; |
| |
| might_sleep(); |
| |
| if (WARN_ON_ONCE(!disk_live(disk) && !(disk->flags & GENHD_FL_HIDDEN))) |
| return; |
| |
| blk_integrity_del(disk); |
| disk_del_events(disk); |
| |
| mutex_lock(&disk->open_mutex); |
| remove_inode_hash(disk->part0->bd_inode); |
| blk_drop_partitions(disk); |
| mutex_unlock(&disk->open_mutex); |
| |
| fsync_bdev(disk->part0); |
| __invalidate_device(disk->part0, true); |
| |
| /* |
| * Fail any new I/O. |
| */ |
| set_bit(GD_DEAD, &disk->state); |
| if (test_bit(GD_OWNS_QUEUE, &disk->state)) |
| blk_queue_flag_set(QUEUE_FLAG_DYING, q); |
| set_capacity(disk, 0); |
| |
| /* |
| * Prevent new I/O from crossing bio_queue_enter(). |
| */ |
| blk_queue_start_drain(q); |
| |
| if (!(disk->flags & GENHD_FL_HIDDEN)) { |
| sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); |
| |
| /* |
| * Unregister bdi before releasing device numbers (as they can |
| * get reused and we'd get clashes in sysfs). |
| */ |
| bdi_unregister(disk->bdi); |
| } |
| |
| blk_unregister_queue(disk); |
| |
| kobject_put(disk->part0->bd_holder_dir); |
| kobject_put(disk->slave_dir); |
| disk->slave_dir = NULL; |
| |
| part_stat_set_all(disk->part0, 0); |
| disk->part0->bd_stamp = 0; |
| if (!sysfs_deprecated) |
| sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); |
| pm_runtime_set_memalloc_noio(disk_to_dev(disk), false); |
| device_del(disk_to_dev(disk)); |
| |
| blk_mq_freeze_queue_wait(q); |
| |
| blk_throtl_cancel_bios(disk); |
| |
| blk_sync_queue(q); |
| blk_flush_integrity(); |
| blk_mq_cancel_work_sync(q); |
| |
| blk_mq_quiesce_queue(q); |
| if (q->elevator) { |
| mutex_lock(&q->sysfs_lock); |
| elevator_exit(q); |
| mutex_unlock(&q->sysfs_lock); |
| } |
| rq_qos_exit(q); |
| blk_mq_unquiesce_queue(q); |
| |
| /* |
| * If the disk does not own the queue, allow using passthrough requests |
| * again. Else leave the queue frozen to fail all I/O. |
| */ |
| if (!test_bit(GD_OWNS_QUEUE, &disk->state)) { |
| blk_queue_flag_clear(QUEUE_FLAG_INIT_DONE, q); |
| __blk_mq_unfreeze_queue(q, true); |
| } else { |
| if (queue_is_mq(q)) |
| blk_mq_exit_queue(q); |
| } |
| } |
| EXPORT_SYMBOL(del_gendisk); |
| |
| /** |
| * invalidate_disk - invalidate the disk |
| * @disk: the struct gendisk to invalidate |
| * |
| * A helper to invalidates the disk. It will clean the disk's associated |
| * buffer/page caches and reset its internal states so that the disk |
| * can be reused by the drivers. |
| * |
| * Context: can sleep |
| */ |
| void invalidate_disk(struct gendisk *disk) |
| { |
| struct block_device *bdev = disk->part0; |
| |
| invalidate_bdev(bdev); |
| bdev->bd_inode->i_mapping->wb_err = 0; |
| set_capacity(disk, 0); |
| } |
| EXPORT_SYMBOL(invalidate_disk); |
| |
| /* sysfs access to bad-blocks list. */ |
| static ssize_t disk_badblocks_show(struct device *dev, |
| struct device_attribute *attr, |
| char *page) |
| { |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| if (!disk->bb) |
| return sprintf(page, "\n"); |
| |
| return badblocks_show(disk->bb, page, 0); |
| } |
| |
| static ssize_t disk_badblocks_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *page, size_t len) |
| { |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| if (!disk->bb) |
| return -ENXIO; |
| |
| return badblocks_store(disk->bb, page, len, 0); |
| } |
| |
| #ifdef CONFIG_BLOCK_LEGACY_AUTOLOAD |
| void blk_request_module(dev_t devt) |
| { |
| unsigned int major = MAJOR(devt); |
| struct blk_major_name **n; |
| |
| mutex_lock(&major_names_lock); |
| for (n = &major_names[major_to_index(major)]; *n; n = &(*n)->next) { |
| if ((*n)->major == major && (*n)->probe) { |
| (*n)->probe(devt); |
| mutex_unlock(&major_names_lock); |
| return; |
| } |
| } |
| mutex_unlock(&major_names_lock); |
| |
| if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
| /* Make old-style 2.4 aliases work */ |
| request_module("block-major-%d", MAJOR(devt)); |
| } |
| #endif /* CONFIG_BLOCK_LEGACY_AUTOLOAD */ |
| |
| /* |
| * print a full list of all partitions - intended for places where the root |
| * filesystem can't be mounted and thus to give the victim some idea of what |
| * went wrong |
| */ |
| void __init printk_all_partitions(void) |
| { |
| struct class_dev_iter iter; |
| struct device *dev; |
| |
| class_dev_iter_init(&iter, &block_class, NULL, &disk_type); |
| while ((dev = class_dev_iter_next(&iter))) { |
| struct gendisk *disk = dev_to_disk(dev); |
| struct block_device *part; |
| char devt_buf[BDEVT_SIZE]; |
| unsigned long idx; |
| |
| /* |
| * Don't show empty devices or things that have been |
| * suppressed |
| */ |
| if (get_capacity(disk) == 0 || (disk->flags & GENHD_FL_HIDDEN)) |
| continue; |
| |
| /* |
| * Note, unlike /proc/partitions, I am showing the numbers in |
| * hex - the same format as the root= option takes. |
| */ |
| rcu_read_lock(); |
| xa_for_each(&disk->part_tbl, idx, part) { |
| if (!bdev_nr_sectors(part)) |
| continue; |
| printk("%s%s %10llu %pg %s", |
| bdev_is_partition(part) ? " " : "", |
| bdevt_str(part->bd_dev, devt_buf), |
| bdev_nr_sectors(part) >> 1, part, |
| part->bd_meta_info ? |
| part->bd_meta_info->uuid : ""); |
| if (bdev_is_partition(part)) |
| printk("\n"); |
| else if (dev->parent && dev->parent->driver) |
| printk(" driver: %s\n", |
| dev->parent->driver->name); |
| else |
| printk(" (driver?)\n"); |
| } |
| rcu_read_unlock(); |
| } |
| class_dev_iter_exit(&iter); |
| } |
| |
| #ifdef CONFIG_PROC_FS |
| /* iterator */ |
| static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
| { |
| loff_t skip = *pos; |
| struct class_dev_iter *iter; |
| struct device *dev; |
| |
| iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
| if (!iter) |
| return ERR_PTR(-ENOMEM); |
| |
| seqf->private = iter; |
| class_dev_iter_init(iter, &block_class, NULL, &disk_type); |
| do { |
| dev = class_dev_iter_next(iter); |
| if (!dev) |
| return NULL; |
| } while (skip--); |
| |
| return dev_to_disk(dev); |
| } |
| |
| static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
| { |
| struct device *dev; |
| |
| (*pos)++; |
| dev = class_dev_iter_next(seqf->private); |
| if (dev) |
| return dev_to_disk(dev); |
| |
| return NULL; |
| } |
| |
| static void disk_seqf_stop(struct seq_file *seqf, void *v) |
| { |
| struct class_dev_iter *iter = seqf->private; |
| |
| /* stop is called even after start failed :-( */ |
| if (iter) { |
| class_dev_iter_exit(iter); |
| kfree(iter); |
| seqf->private = NULL; |
| } |
| } |
| |
| static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
| { |
| void *p; |
| |
| p = disk_seqf_start(seqf, pos); |
| if (!IS_ERR_OR_NULL(p) && !*pos) |
| seq_puts(seqf, "major minor #blocks name\n\n"); |
| return p; |
| } |
| |
| static int show_partition(struct seq_file *seqf, void *v) |
| { |
| struct gendisk *sgp = v; |
| struct block_device *part; |
| unsigned long idx; |
| |
| if (!get_capacity(sgp) || (sgp->flags & GENHD_FL_HIDDEN)) |
| return 0; |
| |
| rcu_read_lock(); |
| xa_for_each(&sgp->part_tbl, idx, part) { |
| if (!bdev_nr_sectors(part)) |
| continue; |
| seq_printf(seqf, "%4d %7d %10llu %pg\n", |
| MAJOR(part->bd_dev), MINOR(part->bd_dev), |
| bdev_nr_sectors(part) >> 1, part); |
| } |
| rcu_read_unlock(); |
| return 0; |
| } |
| |
| static const struct seq_operations partitions_op = { |
| .start = show_partition_start, |
| .next = disk_seqf_next, |
| .stop = disk_seqf_stop, |
| .show = show_partition |
| }; |
| #endif |
| |
| static int __init genhd_device_init(void) |
| { |
| int error; |
| |
| block_class.dev_kobj = sysfs_dev_block_kobj; |
| error = class_register(&block_class); |
| if (unlikely(error)) |
| return error; |
| blk_dev_init(); |
| |
| register_blkdev(BLOCK_EXT_MAJOR, "blkext"); |
| |
| /* create top-level block dir */ |
| if (!sysfs_deprecated) |
| block_depr = kobject_create_and_add("block", NULL); |
| return 0; |
| } |
| |
| subsys_initcall(genhd_device_init); |
| |
| static ssize_t disk_range_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| return sprintf(buf, "%d\n", disk->minors); |
| } |
| |
| static ssize_t disk_ext_range_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| return sprintf(buf, "%d\n", |
| (disk->flags & GENHD_FL_NO_PART) ? 1 : DISK_MAX_PARTS); |
| } |
| |
| static ssize_t disk_removable_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| return sprintf(buf, "%d\n", |
| (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); |
| } |
| |
| static ssize_t disk_hidden_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| return sprintf(buf, "%d\n", |
| (disk->flags & GENHD_FL_HIDDEN ? 1 : 0)); |
| } |
| |
| static ssize_t disk_ro_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| return sprintf(buf, "%d\n", get_disk_ro(disk) ? 1 : 0); |
| } |
| |
| ssize_t part_size_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| return sprintf(buf, "%llu\n", bdev_nr_sectors(dev_to_bdev(dev))); |
| } |
| |
| ssize_t part_stat_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct block_device *bdev = dev_to_bdev(dev); |
| struct request_queue *q = bdev_get_queue(bdev); |
| struct disk_stats stat; |
| unsigned int inflight; |
| |
| if (queue_is_mq(q)) |
| inflight = blk_mq_in_flight(q, bdev); |
| else |
| inflight = part_in_flight(bdev); |
| |
| if (inflight) { |
| part_stat_lock(); |
| update_io_ticks(bdev, jiffies, true); |
| part_stat_unlock(); |
| } |
| part_stat_read_all(bdev, &stat); |
| return sprintf(buf, |
| "%8lu %8lu %8llu %8u " |
| "%8lu %8lu %8llu %8u " |
| "%8u %8u %8u " |
| "%8lu %8lu %8llu %8u " |
| "%8lu %8u" |
| "\n", |
| stat.ios[STAT_READ], |
| stat.merges[STAT_READ], |
| (unsigned long long)stat.sectors[STAT_READ], |
| (unsigned int)div_u64(stat.nsecs[STAT_READ], NSEC_PER_MSEC), |
| stat.ios[STAT_WRITE], |
| stat.merges[STAT_WRITE], |
| (unsigned long long)stat.sectors[STAT_WRITE], |
| (unsigned int)div_u64(stat.nsecs[STAT_WRITE], NSEC_PER_MSEC), |
| inflight, |
| jiffies_to_msecs(stat.io_ticks), |
| (unsigned int)div_u64(stat.nsecs[STAT_READ] + |
| stat.nsecs[STAT_WRITE] + |
| stat.nsecs[STAT_DISCARD] + |
| stat.nsecs[STAT_FLUSH], |
| NSEC_PER_MSEC), |
| stat.ios[STAT_DISCARD], |
| stat.merges[STAT_DISCARD], |
| (unsigned long long)stat.sectors[STAT_DISCARD], |
| (unsigned int)div_u64(stat.nsecs[STAT_DISCARD], NSEC_PER_MSEC), |
| stat.ios[STAT_FLUSH], |
| (unsigned int)div_u64(stat.nsecs[STAT_FLUSH], NSEC_PER_MSEC)); |
| } |
| |
| ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct block_device *bdev = dev_to_bdev(dev); |
| struct request_queue *q = bdev_get_queue(bdev); |
| unsigned int inflight[2]; |
| |
| if (queue_is_mq(q)) |
| blk_mq_in_flight_rw(q, bdev, inflight); |
| else |
| part_in_flight_rw(bdev, inflight); |
| |
| return sprintf(buf, "%8u %8u\n", inflight[0], inflight[1]); |
| } |
| |
| static ssize_t disk_capability_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| return sprintf(buf, "%x\n", disk->flags); |
| } |
| |
| static ssize_t disk_alignment_offset_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| return sprintf(buf, "%d\n", bdev_alignment_offset(disk->part0)); |
| } |
| |
| static ssize_t disk_discard_alignment_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| return sprintf(buf, "%d\n", bdev_alignment_offset(disk->part0)); |
| } |
| |
| static ssize_t diskseq_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| return sprintf(buf, "%llu\n", disk->diskseq); |
| } |
| |
| static DEVICE_ATTR(range, 0444, disk_range_show, NULL); |
| static DEVICE_ATTR(ext_range, 0444, disk_ext_range_show, NULL); |
| static DEVICE_ATTR(removable, 0444, disk_removable_show, NULL); |
| static DEVICE_ATTR(hidden, 0444, disk_hidden_show, NULL); |
| static DEVICE_ATTR(ro, 0444, disk_ro_show, NULL); |
| static DEVICE_ATTR(size, 0444, part_size_show, NULL); |
| static DEVICE_ATTR(alignment_offset, 0444, disk_alignment_offset_show, NULL); |
| static DEVICE_ATTR(discard_alignment, 0444, disk_discard_alignment_show, NULL); |
| static DEVICE_ATTR(capability, 0444, disk_capability_show, NULL); |
| static DEVICE_ATTR(stat, 0444, part_stat_show, NULL); |
| static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL); |
| static DEVICE_ATTR(badblocks, 0644, disk_badblocks_show, disk_badblocks_store); |
| static DEVICE_ATTR(diskseq, 0444, diskseq_show, NULL); |
| |
| #ifdef CONFIG_FAIL_MAKE_REQUEST |
| ssize_t part_fail_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| return sprintf(buf, "%d\n", dev_to_bdev(dev)->bd_make_it_fail); |
| } |
| |
| ssize_t part_fail_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| int i; |
| |
| if (count > 0 && sscanf(buf, "%d", &i) > 0) |
| dev_to_bdev(dev)->bd_make_it_fail = i; |
| |
| return count; |
| } |
| |
| static struct device_attribute dev_attr_fail = |
| __ATTR(make-it-fail, 0644, part_fail_show, part_fail_store); |
| #endif /* CONFIG_FAIL_MAKE_REQUEST */ |
| |
| #ifdef CONFIG_FAIL_IO_TIMEOUT |
| static struct device_attribute dev_attr_fail_timeout = |
| __ATTR(io-timeout-fail, 0644, part_timeout_show, part_timeout_store); |
| #endif |
| |
| static struct attribute *disk_attrs[] = { |
| &dev_attr_range.attr, |
| &dev_attr_ext_range.attr, |
| &dev_attr_removable.attr, |
| &dev_attr_hidden.attr, |
| &dev_attr_ro.attr, |
| &dev_attr_size.attr, |
| &dev_attr_alignment_offset.attr, |
| &dev_attr_discard_alignment.attr, |
| &dev_attr_capability.attr, |
| &dev_attr_stat.attr, |
| &dev_attr_inflight.attr, |
| &dev_attr_badblocks.attr, |
| &dev_attr_events.attr, |
| &dev_attr_events_async.attr, |
| &dev_attr_events_poll_msecs.attr, |
| &dev_attr_diskseq.attr, |
| #ifdef CONFIG_FAIL_MAKE_REQUEST |
| &dev_attr_fail.attr, |
| #endif |
| #ifdef CONFIG_FAIL_IO_TIMEOUT |
| &dev_attr_fail_timeout.attr, |
| #endif |
| NULL |
| }; |
| |
| static umode_t disk_visible(struct kobject *kobj, struct attribute *a, int n) |
| { |
| struct device *dev = container_of(kobj, typeof(*dev), kobj); |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| if (a == &dev_attr_badblocks.attr && !disk->bb) |
| return 0; |
| return a->mode; |
| } |
| |
| static struct attribute_group disk_attr_group = { |
| .attrs = disk_attrs, |
| .is_visible = disk_visible, |
| }; |
| |
| static const struct attribute_group *disk_attr_groups[] = { |
| &disk_attr_group, |
| #ifdef CONFIG_BLK_DEV_IO_TRACE |
| &blk_trace_attr_group, |
| #endif |
| NULL |
| }; |
| |
| /** |
| * disk_release - releases all allocated resources of the gendisk |
| * @dev: the device representing this disk |
| * |
| * This function releases all allocated resources of the gendisk. |
| * |
| * Drivers which used __device_add_disk() have a gendisk with a request_queue |
| * assigned. Since the request_queue sits on top of the gendisk for these |
| * drivers we also call blk_put_queue() for them, and we expect the |
| * request_queue refcount to reach 0 at this point, and so the request_queue |
| * will also be freed prior to the disk. |
| * |
| * Context: can sleep |
| */ |
| static void disk_release(struct device *dev) |
| { |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| might_sleep(); |
| WARN_ON_ONCE(disk_live(disk)); |
| |
| blk_trace_remove(disk->queue); |
| |
| /* |
| * To undo the all initialization from blk_mq_init_allocated_queue in |
| * case of a probe failure where add_disk is never called we have to |
| * call blk_mq_exit_queue here. We can't do this for the more common |
| * teardown case (yet) as the tagset can be gone by the time the disk |
| * is released once it was added. |
| */ |
| if (queue_is_mq(disk->queue) && |
| test_bit(GD_OWNS_QUEUE, &disk->state) && |
| !test_bit(GD_ADDED, &disk->state)) |
| blk_mq_exit_queue(disk->queue); |
| |
| blkcg_exit_disk(disk); |
| |
| bioset_exit(&disk->bio_split); |
| |
| disk_release_events(disk); |
| kfree(disk->random); |
| disk_free_zone_bitmaps(disk); |
| xa_destroy(&disk->part_tbl); |
| |
| disk->queue->disk = NULL; |
| blk_put_queue(disk->queue); |
| |
| if (test_bit(GD_ADDED, &disk->state) && disk->fops->free_disk) |
| disk->fops->free_disk(disk); |
| |
| iput(disk->part0->bd_inode); /* frees the disk */ |
| } |
| |
| static int block_uevent(struct device *dev, struct kobj_uevent_env *env) |
| { |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| return add_uevent_var(env, "DISKSEQ=%llu", disk->diskseq); |
| } |
| |
| struct class block_class = { |
| .name = "block", |
| .dev_uevent = block_uevent, |
| }; |
| |
| static char *block_devnode(struct device *dev, umode_t *mode, |
| kuid_t *uid, kgid_t *gid) |
| { |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| if (disk->fops->devnode) |
| return disk->fops->devnode(disk, mode); |
| return NULL; |
| } |
| |
| const struct device_type disk_type = { |
| .name = "disk", |
| .groups = disk_attr_groups, |
| .release = disk_release, |
| .devnode = block_devnode, |
| }; |
| |
| #ifdef CONFIG_PROC_FS |
| /* |
| * aggregate disk stat collector. Uses the same stats that the sysfs |
| * entries do, above, but makes them available through one seq_file. |
| * |
| * The output looks suspiciously like /proc/partitions with a bunch of |
| * extra fields. |
| */ |
| static int diskstats_show(struct seq_file *seqf, void *v) |
| { |
| struct gendisk *gp = v; |
| struct block_device *hd; |
| unsigned int inflight; |
| struct disk_stats stat; |
| unsigned long idx; |
| |
| /* |
| if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) |
| seq_puts(seqf, "major minor name" |
| " rio rmerge rsect ruse wio wmerge " |
| "wsect wuse running use aveq" |
| "\n\n"); |
| */ |
| |
| rcu_read_lock(); |
| xa_for_each(&gp->part_tbl, idx, hd) { |
| if (bdev_is_partition(hd) && !bdev_nr_sectors(hd)) |
| continue; |
| if (queue_is_mq(gp->queue)) |
| inflight = blk_mq_in_flight(gp->queue, hd); |
| else |
| inflight = part_in_flight(hd); |
| |
| if (inflight) { |
| part_stat_lock(); |
| update_io_ticks(hd, jiffies, true); |
| part_stat_unlock(); |
| } |
| part_stat_read_all(hd, &stat); |
| seq_printf(seqf, "%4d %7d %pg " |
| "%lu %lu %lu %u " |
| "%lu %lu %lu %u " |
| "%u %u %u " |
| "%lu %lu %lu %u " |
| "%lu %u" |
| "\n", |
| MAJOR(hd->bd_dev), MINOR(hd->bd_dev), hd, |
| stat.ios[STAT_READ], |
| stat.merges[STAT_READ], |
| stat.sectors[STAT_READ], |
| (unsigned int)div_u64(stat.nsecs[STAT_READ], |
| NSEC_PER_MSEC), |
| stat.ios[STAT_WRITE], |
| stat.merges[STAT_WRITE], |
| stat.sectors[STAT_WRITE], |
| (unsigned int)div_u64(stat.nsecs[STAT_WRITE], |
| NSEC_PER_MSEC), |
| inflight, |
| jiffies_to_msecs(stat.io_ticks), |
| (unsigned int)div_u64(stat.nsecs[STAT_READ] + |
| stat.nsecs[STAT_WRITE] + |
| stat.nsecs[STAT_DISCARD] + |
| stat.nsecs[STAT_FLUSH], |
| NSEC_PER_MSEC), |
| stat.ios[STAT_DISCARD], |
| stat.merges[STAT_DISCARD], |
| stat.sectors[STAT_DISCARD], |
| (unsigned int)div_u64(stat.nsecs[STAT_DISCARD], |
| NSEC_PER_MSEC), |
| stat.ios[STAT_FLUSH], |
| (unsigned int)div_u64(stat.nsecs[STAT_FLUSH], |
| NSEC_PER_MSEC) |
| ); |
| } |
| rcu_read_unlock(); |
| |
| return 0; |
| } |
| |
| static const struct seq_operations diskstats_op = { |
| .start = disk_seqf_start, |
| .next = disk_seqf_next, |
| .stop = disk_seqf_stop, |
| .show = diskstats_show |
| }; |
| |
| static int __init proc_genhd_init(void) |
| { |
| proc_create_seq("diskstats", 0, NULL, &diskstats_op); |
| proc_create_seq("partitions", 0, NULL, &partitions_op); |
| return 0; |
| } |
| module_init(proc_genhd_init); |
| #endif /* CONFIG_PROC_FS */ |
| |
| dev_t part_devt(struct gendisk *disk, u8 partno) |
| { |
| struct block_device *part; |
| dev_t devt = 0; |
| |
| rcu_read_lock(); |
| part = xa_load(&disk->part_tbl, partno); |
| if (part) |
| devt = part->bd_dev; |
| rcu_read_unlock(); |
| |
| return devt; |
| } |
| |
| dev_t blk_lookup_devt(const char *name, int partno) |
| { |
| dev_t devt = MKDEV(0, 0); |
| struct class_dev_iter iter; |
| struct device *dev; |
| |
| class_dev_iter_init(&iter, &block_class, NULL, &disk_type); |
| while ((dev = class_dev_iter_next(&iter))) { |
| struct gendisk *disk = dev_to_disk(dev); |
| |
| if (strcmp(dev_name(dev), name)) |
| continue; |
| |
| if (partno < disk->minors) { |
| /* We need to return the right devno, even |
| * if the partition doesn't exist yet. |
| */ |
| devt = MKDEV(MAJOR(dev->devt), |
| MINOR(dev->devt) + partno); |
| } else { |
| devt = part_devt(disk, partno); |
| if (devt) |
| break; |
| } |
| } |
| class_dev_iter_exit(&iter); |
| return devt; |
| } |
| |
| struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id, |
| struct lock_class_key *lkclass) |
| { |
| struct gendisk *disk; |
| |
| disk = kzalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id); |
| if (!disk) |
| return NULL; |
| |
| if (bioset_init(&disk->bio_split, BIO_POOL_SIZE, 0, 0)) |
| goto out_free_disk; |
| |
| disk->bdi = bdi_alloc(node_id); |
| if (!disk->bdi) |
| goto out_free_bioset; |
| |
| /* bdev_alloc() might need the queue, set before the first call */ |
| disk->queue = q; |
| |
| disk->part0 = bdev_alloc(disk, 0); |
| if (!disk->part0) |
| goto out_free_bdi; |
| |
| disk->node_id = node_id; |
| mutex_init(&disk->open_mutex); |
| xa_init(&disk->part_tbl); |
| if (xa_insert(&disk->part_tbl, 0, disk->part0, GFP_KERNEL)) |
| goto out_destroy_part_tbl; |
| |
| if (blkcg_init_disk(disk)) |
| goto out_erase_part0; |
| |
| rand_initialize_disk(disk); |
| disk_to_dev(disk)->class = &block_class; |
| disk_to_dev(disk)->type = &disk_type; |
| device_initialize(disk_to_dev(disk)); |
| inc_diskseq(disk); |
| q->disk = disk; |
| lockdep_init_map(&disk->lockdep_map, "(bio completion)", lkclass, 0); |
| #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED |
| INIT_LIST_HEAD(&disk->slave_bdevs); |
| #endif |
| return disk; |
| |
| out_erase_part0: |
| xa_erase(&disk->part_tbl, 0); |
| out_destroy_part_tbl: |
| xa_destroy(&disk->part_tbl); |
| disk->part0->bd_disk = NULL; |
| iput(disk->part0->bd_inode); |
| out_free_bdi: |
| bdi_put(disk->bdi); |
| out_free_bioset: |
| bioset_exit(&disk->bio_split); |
| out_free_disk: |
| kfree(disk); |
| return NULL; |
| } |
| |
| struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass) |
| { |
| struct request_queue *q; |
| struct gendisk *disk; |
| |
| q = blk_alloc_queue(node, false); |
| if (!q) |
| return NULL; |
| |
| disk = __alloc_disk_node(q, node, lkclass); |
| if (!disk) { |
| blk_put_queue(q); |
| return NULL; |
| } |
| set_bit(GD_OWNS_QUEUE, &disk->state); |
| return disk; |
| } |
| EXPORT_SYMBOL(__blk_alloc_disk); |
| |
| /** |
| * put_disk - decrements the gendisk refcount |
| * @disk: the struct gendisk to decrement the refcount for |
| * |
| * This decrements the refcount for the struct gendisk. When this reaches 0 |
| * we'll have disk_release() called. |
| * |
| * Note: for blk-mq disk put_disk must be called before freeing the tag_set |
| * when handling probe errors (that is before add_disk() is called). |
| * |
| * Context: Any context, but the last reference must not be dropped from |
| * atomic context. |
| */ |
| void put_disk(struct gendisk *disk) |
| { |
| if (disk) |
| put_device(disk_to_dev(disk)); |
| } |
| EXPORT_SYMBOL(put_disk); |
| |
| static void set_disk_ro_uevent(struct gendisk *gd, int ro) |
| { |
| char event[] = "DISK_RO=1"; |
| char *envp[] = { event, NULL }; |
| |
| if (!ro) |
| event[8] = '0'; |
| kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp); |
| } |
| |
| /** |
| * set_disk_ro - set a gendisk read-only |
| * @disk: gendisk to operate on |
| * @read_only: %true to set the disk read-only, %false set the disk read/write |
| * |
| * This function is used to indicate whether a given disk device should have its |
| * read-only flag set. set_disk_ro() is typically used by device drivers to |
| * indicate whether the underlying physical device is write-protected. |
| */ |
| void set_disk_ro(struct gendisk *disk, bool read_only) |
| { |
| if (read_only) { |
| if (test_and_set_bit(GD_READ_ONLY, &disk->state)) |
| return; |
| } else { |
| if (!test_and_clear_bit(GD_READ_ONLY, &disk->state)) |
| return; |
| } |
| set_disk_ro_uevent(disk, read_only); |
| } |
| EXPORT_SYMBOL(set_disk_ro); |
| |
| void inc_diskseq(struct gendisk *disk) |
| { |
| disk->diskseq = atomic64_inc_return(&diskseq); |
| } |