diff options
Diffstat (limited to 'drivers/block/genhd.c')
| -rw-r--r-- | drivers/block/genhd.c | 726 |
1 files changed, 0 insertions, 726 deletions
diff --git a/drivers/block/genhd.c b/drivers/block/genhd.c deleted file mode 100644 index 54aec4a1ae13..000000000000 --- a/drivers/block/genhd.c +++ /dev/null @@ -1,726 +0,0 @@ -/* - * gendisk handling - */ - -#include <linux/config.h> -#include <linux/module.h> -#include <linux/fs.h> -#include <linux/genhd.h> -#include <linux/kernel.h> -#include <linux/blkdev.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/seq_file.h> -#include <linux/slab.h> -#include <linux/kmod.h> -#include <linux/kobj_map.h> -#include <linux/buffer_head.h> - -#define MAX_PROBE_HASH 255 /* random */ - -static struct subsystem block_subsys; - -static DECLARE_MUTEX(block_subsys_sem); - -/* - * Can be deleted altogether. Later. - * - */ -static struct blk_major_name { - struct blk_major_name *next; - int major; - char name[16]; -} *major_names[MAX_PROBE_HASH]; - -/* index in the above - for now: assume no multimajor ranges */ -static inline int major_to_index(int major) -{ - return major % MAX_PROBE_HASH; -} - -#ifdef CONFIG_PROC_FS -/* get block device names in somewhat random order */ -int get_blkdev_list(char *p, int used) -{ - struct blk_major_name *n; - int i, len; - - len = snprintf(p, (PAGE_SIZE-used), "\nBlock devices:\n"); - - down(&block_subsys_sem); - for (i = 0; i < ARRAY_SIZE(major_names); i++) { - for (n = major_names[i]; n; n = n->next) { - /* - * If the curent string plus the 5 extra characters - * in the line would run us off the page, then we're done - */ - if ((len + used + strlen(n->name) + 5) >= PAGE_SIZE) - goto page_full; - len += sprintf(p+len, "%3d %s\n", - n->major, n->name); - } - } -page_full: - up(&block_subsys_sem); - - return len; -} -#endif - -int register_blkdev(unsigned int major, const char *name) -{ - struct blk_major_name **n, *p; - int index, ret = 0; - - down(&block_subsys_sem); - - /* temporary */ - if (major == 0) { - for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { - if (major_names[index] == NULL) - break; - } - - if (index == 0) { - printk("register_blkdev: failed to get major for %s\n", - name); - ret = -EBUSY; - goto out; - } - major = index; - ret = major; - } - - p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); - if (p == NULL) { - ret = -ENOMEM; - goto out; - } - - p->major = major; - strlcpy(p->name, name, sizeof(p->name)); - p->next = NULL; - index = major_to_index(major); - - for (n = &major_names[index]; *n; n = &(*n)->next) { - if ((*n)->major == major) - break; - } - if (!*n) - *n = p; - else - ret = -EBUSY; - - if (ret < 0) { - printk("register_blkdev: cannot get major %d for %s\n", - major, name); - kfree(p); - } -out: - up(&block_subsys_sem); - return ret; -} - -EXPORT_SYMBOL(register_blkdev); - -/* todo: make void - error printk here */ -int 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); - int ret = 0; - - down(&block_subsys_sem); - for (n = &major_names[index]; *n; n = &(*n)->next) - if ((*n)->major == major) - break; - if (!*n || strcmp((*n)->name, name)) - ret = -EINVAL; - else { - p = *n; - *n = p->next; - } - up(&block_subsys_sem); - kfree(p); - - return ret; -} - -EXPORT_SYMBOL(unregister_blkdev); - -static struct kobj_map *bdev_map; - -/* - * Register device numbers dev..(dev+range-1) - * range must be nonzero - * The hash chain is sorted on range, so that subranges can override. - */ -void blk_register_region(dev_t dev, unsigned long range, struct module *module, - struct kobject *(*probe)(dev_t, int *, void *), - int (*lock)(dev_t, void *), void *data) -{ - kobj_map(bdev_map, dev, range, module, probe, lock, data); -} - -EXPORT_SYMBOL(blk_register_region); - -void blk_unregister_region(dev_t dev, unsigned long range) -{ - kobj_unmap(bdev_map, dev, range); -} - -EXPORT_SYMBOL(blk_unregister_region); - -static struct kobject *exact_match(dev_t dev, int *part, void *data) -{ - struct gendisk *p = data; - return &p->kobj; -} - -static int exact_lock(dev_t dev, void *data) -{ - struct gendisk *p = data; - - if (!get_disk(p)) - return -1; - return 0; -} - -/** - * add_disk - add partitioning information to kernel list - * @disk: per-device partitioning information - * - * This function registers the partitioning information in @disk - * with the kernel. - */ -void add_disk(struct gendisk *disk) -{ - disk->flags |= GENHD_FL_UP; - blk_register_region(MKDEV(disk->major, disk->first_minor), - disk->minors, NULL, exact_match, exact_lock, disk); - register_disk(disk); - blk_register_queue(disk); -} - -EXPORT_SYMBOL(add_disk); -EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */ - -void unlink_gendisk(struct gendisk *disk) -{ - blk_unregister_queue(disk); - blk_unregister_region(MKDEV(disk->major, disk->first_minor), - disk->minors); -} - -#define to_disk(obj) container_of(obj,struct gendisk,kobj) - -/** - * get_gendisk - get partitioning information for a given device - * @dev: device to get partitioning information for - * - * This function gets the structure containing partitioning - * information for the given device @dev. - */ -struct gendisk *get_gendisk(dev_t dev, int *part) -{ - struct kobject *kobj = kobj_lookup(bdev_map, dev, part); - return kobj ? to_disk(kobj) : NULL; -} - -#ifdef CONFIG_PROC_FS -/* iterator */ -static void *part_start(struct seq_file *part, loff_t *pos) -{ - struct list_head *p; - loff_t l = *pos; - - down(&block_subsys_sem); - list_for_each(p, &block_subsys.kset.list) - if (!l--) - return list_entry(p, struct gendisk, kobj.entry); - return NULL; -} - -static void *part_next(struct seq_file *part, void *v, loff_t *pos) -{ - struct list_head *p = ((struct gendisk *)v)->kobj.entry.next; - ++*pos; - return p==&block_subsys.kset.list ? NULL : - list_entry(p, struct gendisk, kobj.entry); -} - -static void part_stop(struct seq_file *part, void *v) -{ - up(&block_subsys_sem); -} - -static int show_partition(struct seq_file *part, void *v) -{ - struct gendisk *sgp = v; - int n; - char buf[BDEVNAME_SIZE]; - - if (&sgp->kobj.entry == block_subsys.kset.list.next) - seq_puts(part, "major minor #blocks name\n\n"); - - /* Don't show non-partitionable removeable devices or empty devices */ - if (!get_capacity(sgp) || - (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE))) - return 0; - if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) - return 0; - - /* show the full disk and all non-0 size partitions of it */ - seq_printf(part, "%4d %4d %10llu %s\n", - sgp->major, sgp->first_minor, - (unsigned long long)get_capacity(sgp) >> 1, - disk_name(sgp, 0, buf)); - for (n = 0; n < sgp->minors - 1; n++) { - if (!sgp->part[n]) - continue; - if (sgp->part[n]->nr_sects == 0) - continue; - seq_printf(part, "%4d %4d %10llu %s\n", - sgp->major, n + 1 + sgp->first_minor, - (unsigned long long)sgp->part[n]->nr_sects >> 1 , - disk_name(sgp, n + 1, buf)); - } - - return 0; -} - -struct seq_operations partitions_op = { - .start =part_start, - .next = part_next, - .stop = part_stop, - .show = show_partition -}; -#endif - - -extern int blk_dev_init(void); - -static struct kobject *base_probe(dev_t dev, int *part, void *data) -{ - if (request_module("block-major-%d-%d", MAJOR(dev), MINOR(dev)) > 0) - /* Make old-style 2.4 aliases work */ - request_module("block-major-%d", MAJOR(dev)); - return NULL; -} - -static int __init genhd_device_init(void) -{ - bdev_map = kobj_map_init(base_probe, &block_subsys_sem); - blk_dev_init(); - subsystem_register(&block_subsys); - return 0; -} - -subsys_initcall(genhd_device_init); - - - -/* - * kobject & sysfs bindings for block devices - */ -static ssize_t disk_attr_show(struct kobject *kobj, struct attribute *attr, - char *page) -{ - struct gendisk *disk = to_disk(kobj); - struct disk_attribute *disk_attr = - container_of(attr,struct disk_attribute,attr); - ssize_t ret = -EIO; - - if (disk_attr->show) - ret = disk_attr->show(disk,page); - return ret; -} - -static ssize_t disk_attr_store(struct kobject * kobj, struct attribute * attr, - const char *page, size_t count) -{ - struct gendisk *disk = to_disk(kobj); - struct disk_attribute *disk_attr = - container_of(attr,struct disk_attribute,attr); - ssize_t ret = 0; - - if (disk_attr->store) - ret = disk_attr->store(disk, page, count); - return ret; -} - -static struct sysfs_ops disk_sysfs_ops = { - .show = &disk_attr_show, - .store = &disk_attr_store, -}; - -static ssize_t disk_uevent_store(struct gendisk * disk, - const char *buf, size_t count) -{ - kobject_hotplug(&disk->kobj, KOBJ_ADD); - return count; -} -static ssize_t disk_dev_read(struct gendisk * disk, char *page) -{ - dev_t base = MKDEV(disk->major, disk->first_minor); - return print_dev_t(page, base); -} -static ssize_t disk_range_read(struct gendisk * disk, char *page) -{ - return sprintf(page, "%d\n", disk->minors); -} -static ssize_t disk_removable_read(struct gendisk * disk, char *page) -{ - return sprintf(page, "%d\n", - (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); - -} -static ssize_t disk_size_read(struct gendisk * disk, char *page) -{ - return sprintf(page, "%llu\n", (unsigned long long)get_capacity(disk)); -} - -static ssize_t disk_stats_read(struct gendisk * disk, char *page) -{ - preempt_disable(); - disk_round_stats(disk); - preempt_enable(); - return sprintf(page, - "%8u %8u %8llu %8u " - "%8u %8u %8llu %8u " - "%8u %8u %8u" - "\n", - disk_stat_read(disk, ios[0]), disk_stat_read(disk, merges[0]), - (unsigned long long)disk_stat_read(disk, sectors[0]), - jiffies_to_msecs(disk_stat_read(disk, ticks[0])), - disk_stat_read(disk, ios[1]), disk_stat_read(disk, merges[1]), - (unsigned long long)disk_stat_read(disk, sectors[1]), - jiffies_to_msecs(disk_stat_read(disk, ticks[1])), - disk->in_flight, - jiffies_to_msecs(disk_stat_read(disk, io_ticks)), - jiffies_to_msecs(disk_stat_read(disk, time_in_queue))); -} -static struct disk_attribute disk_attr_uevent = { - .attr = {.name = "uevent", .mode = S_IWUSR }, - .store = disk_uevent_store -}; -static struct disk_attribute disk_attr_dev = { - .attr = {.name = "dev", .mode = S_IRUGO }, - .show = disk_dev_read -}; -static struct disk_attribute disk_attr_range = { - .attr = {.name = "range", .mode = S_IRUGO }, - .show = disk_range_read -}; -static struct disk_attribute disk_attr_removable = { - .attr = {.name = "removable", .mode = S_IRUGO }, - .show = disk_removable_read -}; -static struct disk_attribute disk_attr_size = { - .attr = {.name = "size", .mode = S_IRUGO }, - .show = disk_size_read -}; -static struct disk_attribute disk_attr_stat = { - .attr = {.name = "stat", .mode = S_IRUGO }, - .show = disk_stats_read -}; - -static struct attribute * default_attrs[] = { - &disk_attr_uevent.attr, - &disk_attr_dev.attr, - &disk_attr_range.attr, - &disk_attr_removable.attr, - &disk_attr_size.attr, - &disk_attr_stat.attr, - NULL, -}; - -static void disk_release(struct kobject * kobj) -{ - struct gendisk *disk = to_disk(kobj); - kfree(disk->random); - kfree(disk->part); - free_disk_stats(disk); - kfree(disk); -} - -static struct kobj_type ktype_block = { - .release = disk_release, - .sysfs_ops = &disk_sysfs_ops, - .default_attrs = default_attrs, -}; - -extern struct kobj_type ktype_part; - -static int block_hotplug_filter(struct kset *kset, struct kobject *kobj) -{ - struct kobj_type *ktype = get_ktype(kobj); - - return ((ktype == &ktype_block) || (ktype == &ktype_part)); -} - -static int block_hotplug(struct kset *kset, struct kobject *kobj, char **envp, - int num_envp, char *buffer, int buffer_size) -{ - struct kobj_type *ktype = get_ktype(kobj); - struct device *physdev; - struct gendisk *disk; - struct hd_struct *part; - int length = 0; - int i = 0; - - if (ktype == &ktype_block) { - disk = container_of(kobj, struct gendisk, kobj); - add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, - &length, "MINOR=%u", disk->first_minor); - } else if (ktype == &ktype_part) { - disk = container_of(kobj->parent, struct gendisk, kobj); - part = container_of(kobj, struct hd_struct, kobj); - add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, - &length, "MINOR=%u", - disk->first_minor + part->partno); - } else - return 0; - - add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, &length, - "MAJOR=%u", disk->major); - - /* add physical device, backing this device */ - physdev = disk->driverfs_dev; - if (physdev) { - char *path = kobject_get_path(&physdev->kobj, GFP_KERNEL); - - add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, - &length, "PHYSDEVPATH=%s", path); - kfree(path); - - if (physdev->bus) - add_hotplug_env_var(envp, num_envp, &i, - buffer, buffer_size, &length, - "PHYSDEVBUS=%s", - physdev->bus->name); - - if (physdev->driver) - add_hotplug_env_var(envp, num_envp, &i, - buffer, buffer_size, &length, - "PHYSDEVDRIVER=%s", - physdev->driver->name); - } - - /* terminate, set to next free slot, shrink available space */ - envp[i] = NULL; - envp = &envp[i]; - num_envp -= i; - buffer = &buffer[length]; - buffer_size -= length; - - return 0; -} - -static struct kset_hotplug_ops block_hotplug_ops = { - .filter = block_hotplug_filter, - .hotplug = block_hotplug, -}; - -/* declare block_subsys. */ -static decl_subsys(block, &ktype_block, &block_hotplug_ops); - - -/* - * aggregate disk stat collector. Uses the same stats that the sysfs - * entries do, above, but makes them available through one seq_file. - * Watching a few disks may be efficient through sysfs, but watching - * all of them will be more efficient through this interface. - * - * The output looks suspiciously like /proc/partitions with a bunch of - * extra fields. - */ - -/* iterator */ -static void *diskstats_start(struct seq_file *part, loff_t *pos) -{ - loff_t k = *pos; - struct list_head *p; - - down(&block_subsys_sem); - list_for_each(p, &block_subsys.kset.list) - if (!k--) - return list_entry(p, struct gendisk, kobj.entry); - return NULL; -} - -static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos) -{ - struct list_head *p = ((struct gendisk *)v)->kobj.entry.next; - ++*pos; - return p==&block_subsys.kset.list ? NULL : - list_entry(p, struct gendisk, kobj.entry); -} - -static void diskstats_stop(struct seq_file *part, void *v) -{ - up(&block_subsys_sem); -} - -static int diskstats_show(struct seq_file *s, void *v) -{ - struct gendisk *gp = v; - char buf[BDEVNAME_SIZE]; - int n = 0; - - /* - if (&sgp->kobj.entry == block_subsys.kset.list.next) - seq_puts(s, "major minor name" - " rio rmerge rsect ruse wio wmerge " - "wsect wuse running use aveq" - "\n\n"); - */ - - preempt_disable(); - disk_round_stats(gp); - preempt_enable(); - seq_printf(s, "%4d %4d %s %u %u %llu %u %u %u %llu %u %u %u %u\n", - gp->major, n + gp->first_minor, disk_name(gp, n, buf), - disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]), - (unsigned long long)disk_stat_read(gp, sectors[0]), - jiffies_to_msecs(disk_stat_read(gp, ticks[0])), - disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]), - (unsigned long long)disk_stat_read(gp, sectors[1]), - jiffies_to_msecs(disk_stat_read(gp, ticks[1])), - gp->in_flight, - jiffies_to_msecs(disk_stat_read(gp, io_ticks)), - jiffies_to_msecs(disk_stat_read(gp, time_in_queue))); - - /* now show all non-0 size partitions of it */ - for (n = 0; n < gp->minors - 1; n++) { - struct hd_struct *hd = gp->part[n]; - - if (hd && hd->nr_sects) - seq_printf(s, "%4d %4d %s %u %u %u %u\n", - gp->major, n + gp->first_minor + 1, - disk_name(gp, n + 1, buf), - hd->ios[0], hd->sectors[0], - hd->ios[1], hd->sectors[1]); - } - - return 0; -} - -struct seq_operations diskstats_op = { - .start = diskstats_start, - .next = diskstats_next, - .stop = diskstats_stop, - .show = diskstats_show -}; - -struct gendisk *alloc_disk(int minors) -{ - return alloc_disk_node(minors, -1); -} - -struct gendisk *alloc_disk_node(int minors, int node_id) -{ - struct gendisk *disk; - - disk = kmalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id); - if (disk) { - memset(disk, 0, sizeof(struct gendisk)); - if (!init_disk_stats(disk)) { - kfree(disk); - return NULL; - } - if (minors > 1) { - int size = (minors - 1) * sizeof(struct hd_struct *); - disk->part = kmalloc_node(size, GFP_KERNEL, node_id); - if (!disk->part) { - kfree(disk); - return NULL; - } - memset(disk->part, 0, size); - } - disk->minors = minors; - kobj_set_kset_s(disk,block_subsys); - kobject_init(&disk->kobj); - rand_initialize_disk(disk); - } - return disk; -} - -EXPORT_SYMBOL(alloc_disk); -EXPORT_SYMBOL(alloc_disk_node); - -struct kobject *get_disk(struct gendisk *disk) -{ - struct module *owner; - struct kobject *kobj; - - if (!disk->fops) - return NULL; - owner = disk->fops->owner; - if (owner && !try_module_get(owner)) - return NULL; - kobj = kobject_get(&disk->kobj); - if (kobj == NULL) { - module_put(owner); - return NULL; - } - return kobj; - -} - -EXPORT_SYMBOL(get_disk); - -void put_disk(struct gendisk *disk) -{ - if (disk) - kobject_put(&disk->kobj); -} - -EXPORT_SYMBOL(put_disk); - -void set_device_ro(struct block_device *bdev, int flag) -{ - if (bdev->bd_contains != bdev) - bdev->bd_part->policy = flag; - else - bdev->bd_disk->policy = flag; -} - -EXPORT_SYMBOL(set_device_ro); - -void set_disk_ro(struct gendisk *disk, int flag) -{ - int i; - disk->policy = flag; - for (i = 0; i < disk->minors - 1; i++) - if (disk->part[i]) disk->part[i]->policy = flag; -} - -EXPORT_SYMBOL(set_disk_ro); - -int bdev_read_only(struct block_device *bdev) -{ - if (!bdev) - return 0; - else if (bdev->bd_contains != bdev) - return bdev->bd_part->policy; - else - return bdev->bd_disk->policy; -} - -EXPORT_SYMBOL(bdev_read_only); - -int invalidate_partition(struct gendisk *disk, int index) -{ - int res = 0; - struct block_device *bdev = bdget_disk(disk, index); - if (bdev) { - fsync_bdev(bdev); - res = __invalidate_device(bdev); - bdput(bdev); - } - return res; -} - -EXPORT_SYMBOL(invalidate_partition); |