711 lines
17 KiB
C
711 lines
17 KiB
C
/*
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* gendisk handling
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/genhd.h>
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#include <linux/kernel.h>
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#include <linux/blkdev.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/kmod.h>
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#include <linux/kobj_map.h>
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#include <linux/buffer_head.h>
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#include <linux/mutex.h>
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struct subsystem block_subsys;
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static DEFINE_MUTEX(block_subsys_lock);
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/*
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* Can be deleted altogether. Later.
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*
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*/
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static struct blk_major_name {
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struct blk_major_name *next;
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int major;
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char name[16];
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} *major_names[BLKDEV_MAJOR_HASH_SIZE];
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/* index in the above - for now: assume no multimajor ranges */
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static inline int major_to_index(int major)
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{
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return major % BLKDEV_MAJOR_HASH_SIZE;
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}
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#ifdef CONFIG_PROC_FS
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void blkdev_show(struct seq_file *f, off_t offset)
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{
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struct blk_major_name *dp;
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if (offset < BLKDEV_MAJOR_HASH_SIZE) {
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mutex_lock(&block_subsys_lock);
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for (dp = major_names[offset]; dp; dp = dp->next)
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seq_printf(f, "%3d %s\n", dp->major, dp->name);
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mutex_unlock(&block_subsys_lock);
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}
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}
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#endif /* CONFIG_PROC_FS */
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int register_blkdev(unsigned int major, const char *name)
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{
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struct blk_major_name **n, *p;
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int index, ret = 0;
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mutex_lock(&block_subsys_lock);
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/* temporary */
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if (major == 0) {
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for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) {
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if (major_names[index] == NULL)
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break;
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}
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if (index == 0) {
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printk("register_blkdev: failed to get major for %s\n",
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name);
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ret = -EBUSY;
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goto out;
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}
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major = index;
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ret = major;
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}
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p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL);
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if (p == NULL) {
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ret = -ENOMEM;
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goto out;
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}
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p->major = major;
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strlcpy(p->name, name, sizeof(p->name));
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p->next = NULL;
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index = major_to_index(major);
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for (n = &major_names[index]; *n; n = &(*n)->next) {
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if ((*n)->major == major)
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break;
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}
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if (!*n)
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*n = p;
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else
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ret = -EBUSY;
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if (ret < 0) {
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printk("register_blkdev: cannot get major %d for %s\n",
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major, name);
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kfree(p);
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}
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out:
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mutex_unlock(&block_subsys_lock);
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return ret;
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}
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EXPORT_SYMBOL(register_blkdev);
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/* todo: make void - error printk here */
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int unregister_blkdev(unsigned int major, const char *name)
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{
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struct blk_major_name **n;
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struct blk_major_name *p = NULL;
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int index = major_to_index(major);
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int ret = 0;
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mutex_lock(&block_subsys_lock);
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for (n = &major_names[index]; *n; n = &(*n)->next)
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if ((*n)->major == major)
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break;
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if (!*n || strcmp((*n)->name, name))
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ret = -EINVAL;
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else {
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p = *n;
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*n = p->next;
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}
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mutex_unlock(&block_subsys_lock);
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kfree(p);
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return ret;
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}
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EXPORT_SYMBOL(unregister_blkdev);
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static struct kobj_map *bdev_map;
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/*
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* Register device numbers dev..(dev+range-1)
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* range must be nonzero
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* The hash chain is sorted on range, so that subranges can override.
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*/
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void blk_register_region(dev_t dev, unsigned long range, struct module *module,
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struct kobject *(*probe)(dev_t, int *, void *),
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int (*lock)(dev_t, void *), void *data)
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{
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kobj_map(bdev_map, dev, range, module, probe, lock, data);
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}
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EXPORT_SYMBOL(blk_register_region);
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void blk_unregister_region(dev_t dev, unsigned long range)
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{
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kobj_unmap(bdev_map, dev, range);
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}
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EXPORT_SYMBOL(blk_unregister_region);
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static struct kobject *exact_match(dev_t dev, int *part, void *data)
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{
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struct gendisk *p = data;
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return &p->kobj;
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}
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static int exact_lock(dev_t dev, void *data)
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{
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struct gendisk *p = data;
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if (!get_disk(p))
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return -1;
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return 0;
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}
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/**
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* add_disk - add partitioning information to kernel list
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* @disk: per-device partitioning information
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*
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* This function registers the partitioning information in @disk
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* with the kernel.
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*/
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void add_disk(struct gendisk *disk)
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{
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disk->flags |= GENHD_FL_UP;
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blk_register_region(MKDEV(disk->major, disk->first_minor),
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disk->minors, NULL, exact_match, exact_lock, disk);
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register_disk(disk);
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blk_register_queue(disk);
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}
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EXPORT_SYMBOL(add_disk);
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EXPORT_SYMBOL(del_gendisk); /* in partitions/check.c */
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void unlink_gendisk(struct gendisk *disk)
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{
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blk_unregister_queue(disk);
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blk_unregister_region(MKDEV(disk->major, disk->first_minor),
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disk->minors);
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}
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#define to_disk(obj) container_of(obj,struct gendisk,kobj)
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/**
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* get_gendisk - get partitioning information for a given device
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* @dev: device to get partitioning information for
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*
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* This function gets the structure containing partitioning
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* information for the given device @dev.
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*/
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struct gendisk *get_gendisk(dev_t dev, int *part)
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{
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struct kobject *kobj = kobj_lookup(bdev_map, dev, part);
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return kobj ? to_disk(kobj) : NULL;
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}
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#ifdef CONFIG_PROC_FS
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/* iterator */
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static void *part_start(struct seq_file *part, loff_t *pos)
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{
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struct list_head *p;
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loff_t l = *pos;
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mutex_lock(&block_subsys_lock);
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list_for_each(p, &block_subsys.kset.list)
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if (!l--)
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return list_entry(p, struct gendisk, kobj.entry);
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return NULL;
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}
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static void *part_next(struct seq_file *part, void *v, loff_t *pos)
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{
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struct list_head *p = ((struct gendisk *)v)->kobj.entry.next;
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++*pos;
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return p==&block_subsys.kset.list ? NULL :
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list_entry(p, struct gendisk, kobj.entry);
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}
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static void part_stop(struct seq_file *part, void *v)
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{
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mutex_unlock(&block_subsys_lock);
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}
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static int show_partition(struct seq_file *part, void *v)
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{
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struct gendisk *sgp = v;
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int n;
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char buf[BDEVNAME_SIZE];
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if (&sgp->kobj.entry == block_subsys.kset.list.next)
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seq_puts(part, "major minor #blocks name\n\n");
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/* Don't show non-partitionable removeable devices or empty devices */
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if (!get_capacity(sgp) ||
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(sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE)))
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return 0;
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if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)
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return 0;
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/* show the full disk and all non-0 size partitions of it */
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seq_printf(part, "%4d %4d %10llu %s\n",
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sgp->major, sgp->first_minor,
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(unsigned long long)get_capacity(sgp) >> 1,
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disk_name(sgp, 0, buf));
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for (n = 0; n < sgp->minors - 1; n++) {
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if (!sgp->part[n])
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continue;
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if (sgp->part[n]->nr_sects == 0)
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continue;
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seq_printf(part, "%4d %4d %10llu %s\n",
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sgp->major, n + 1 + sgp->first_minor,
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(unsigned long long)sgp->part[n]->nr_sects >> 1 ,
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disk_name(sgp, n + 1, buf));
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}
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return 0;
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}
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struct seq_operations partitions_op = {
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.start =part_start,
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.next = part_next,
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.stop = part_stop,
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.show = show_partition
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};
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#endif
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extern int blk_dev_init(void);
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static struct kobject *base_probe(dev_t dev, int *part, void *data)
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{
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if (request_module("block-major-%d-%d", MAJOR(dev), MINOR(dev)) > 0)
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/* Make old-style 2.4 aliases work */
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request_module("block-major-%d", MAJOR(dev));
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return NULL;
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}
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static int __init genhd_device_init(void)
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{
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bdev_map = kobj_map_init(base_probe, &block_subsys_lock);
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blk_dev_init();
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subsystem_register(&block_subsys);
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return 0;
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}
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subsys_initcall(genhd_device_init);
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/*
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* kobject & sysfs bindings for block devices
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*/
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static ssize_t disk_attr_show(struct kobject *kobj, struct attribute *attr,
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char *page)
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{
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struct gendisk *disk = to_disk(kobj);
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struct disk_attribute *disk_attr =
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container_of(attr,struct disk_attribute,attr);
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ssize_t ret = -EIO;
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if (disk_attr->show)
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ret = disk_attr->show(disk,page);
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return ret;
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}
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static ssize_t disk_attr_store(struct kobject * kobj, struct attribute * attr,
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const char *page, size_t count)
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{
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struct gendisk *disk = to_disk(kobj);
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struct disk_attribute *disk_attr =
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container_of(attr,struct disk_attribute,attr);
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ssize_t ret = 0;
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if (disk_attr->store)
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ret = disk_attr->store(disk, page, count);
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return ret;
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}
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static struct sysfs_ops disk_sysfs_ops = {
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.show = &disk_attr_show,
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.store = &disk_attr_store,
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};
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static ssize_t disk_uevent_store(struct gendisk * disk,
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const char *buf, size_t count)
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{
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kobject_uevent(&disk->kobj, KOBJ_ADD);
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return count;
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}
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static ssize_t disk_dev_read(struct gendisk * disk, char *page)
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{
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dev_t base = MKDEV(disk->major, disk->first_minor);
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return print_dev_t(page, base);
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}
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static ssize_t disk_range_read(struct gendisk * disk, char *page)
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{
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return sprintf(page, "%d\n", disk->minors);
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}
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static ssize_t disk_removable_read(struct gendisk * disk, char *page)
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{
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return sprintf(page, "%d\n",
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(disk->flags & GENHD_FL_REMOVABLE ? 1 : 0));
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}
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static ssize_t disk_size_read(struct gendisk * disk, char *page)
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{
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return sprintf(page, "%llu\n", (unsigned long long)get_capacity(disk));
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}
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static ssize_t disk_stats_read(struct gendisk * disk, char *page)
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{
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preempt_disable();
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disk_round_stats(disk);
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preempt_enable();
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return sprintf(page,
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"%8lu %8lu %8llu %8u "
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"%8lu %8lu %8llu %8u "
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"%8u %8u %8u"
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"\n",
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disk_stat_read(disk, ios[READ]),
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disk_stat_read(disk, merges[READ]),
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(unsigned long long)disk_stat_read(disk, sectors[READ]),
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jiffies_to_msecs(disk_stat_read(disk, ticks[READ])),
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disk_stat_read(disk, ios[WRITE]),
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disk_stat_read(disk, merges[WRITE]),
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(unsigned long long)disk_stat_read(disk, sectors[WRITE]),
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jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])),
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disk->in_flight,
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jiffies_to_msecs(disk_stat_read(disk, io_ticks)),
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jiffies_to_msecs(disk_stat_read(disk, time_in_queue)));
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}
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static struct disk_attribute disk_attr_uevent = {
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.attr = {.name = "uevent", .mode = S_IWUSR },
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.store = disk_uevent_store
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};
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static struct disk_attribute disk_attr_dev = {
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.attr = {.name = "dev", .mode = S_IRUGO },
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.show = disk_dev_read
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};
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static struct disk_attribute disk_attr_range = {
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.attr = {.name = "range", .mode = S_IRUGO },
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.show = disk_range_read
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};
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static struct disk_attribute disk_attr_removable = {
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.attr = {.name = "removable", .mode = S_IRUGO },
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.show = disk_removable_read
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};
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static struct disk_attribute disk_attr_size = {
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.attr = {.name = "size", .mode = S_IRUGO },
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.show = disk_size_read
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};
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static struct disk_attribute disk_attr_stat = {
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.attr = {.name = "stat", .mode = S_IRUGO },
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.show = disk_stats_read
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};
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static struct attribute * default_attrs[] = {
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&disk_attr_uevent.attr,
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&disk_attr_dev.attr,
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&disk_attr_range.attr,
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&disk_attr_removable.attr,
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&disk_attr_size.attr,
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&disk_attr_stat.attr,
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NULL,
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};
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static void disk_release(struct kobject * kobj)
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{
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struct gendisk *disk = to_disk(kobj);
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kfree(disk->random);
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kfree(disk->part);
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free_disk_stats(disk);
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kfree(disk);
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}
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static struct kobj_type ktype_block = {
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.release = disk_release,
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.sysfs_ops = &disk_sysfs_ops,
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.default_attrs = default_attrs,
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};
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extern struct kobj_type ktype_part;
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static int block_uevent_filter(struct kset *kset, struct kobject *kobj)
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{
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struct kobj_type *ktype = get_ktype(kobj);
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return ((ktype == &ktype_block) || (ktype == &ktype_part));
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}
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static int block_uevent(struct kset *kset, struct kobject *kobj, char **envp,
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int num_envp, char *buffer, int buffer_size)
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{
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struct kobj_type *ktype = get_ktype(kobj);
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struct device *physdev;
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struct gendisk *disk;
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struct hd_struct *part;
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int length = 0;
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int i = 0;
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if (ktype == &ktype_block) {
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disk = container_of(kobj, struct gendisk, kobj);
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add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
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&length, "MINOR=%u", disk->first_minor);
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} else if (ktype == &ktype_part) {
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disk = container_of(kobj->parent, struct gendisk, kobj);
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part = container_of(kobj, struct hd_struct, kobj);
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add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
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&length, "MINOR=%u",
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disk->first_minor + part->partno);
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} else
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return 0;
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add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
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"MAJOR=%u", disk->major);
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/* add physical device, backing this device */
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physdev = disk->driverfs_dev;
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if (physdev) {
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char *path = kobject_get_path(&physdev->kobj, GFP_KERNEL);
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add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
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&length, "PHYSDEVPATH=%s", path);
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kfree(path);
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if (physdev->bus)
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add_uevent_var(envp, num_envp, &i,
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buffer, buffer_size, &length,
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"PHYSDEVBUS=%s",
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physdev->bus->name);
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if (physdev->driver)
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add_uevent_var(envp, num_envp, &i,
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buffer, buffer_size, &length,
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"PHYSDEVDRIVER=%s",
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physdev->driver->name);
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}
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/* terminate, set to next free slot, shrink available space */
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envp[i] = NULL;
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envp = &envp[i];
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num_envp -= i;
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buffer = &buffer[length];
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buffer_size -= length;
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return 0;
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}
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static struct kset_uevent_ops block_uevent_ops = {
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.filter = block_uevent_filter,
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.uevent = block_uevent,
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};
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decl_subsys(block, &ktype_block, &block_uevent_ops);
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/*
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* aggregate disk stat collector. Uses the same stats that the sysfs
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* entries do, above, but makes them available through one seq_file.
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* Watching a few disks may be efficient through sysfs, but watching
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* all of them will be more efficient through this interface.
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*
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* 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;
|
|
|
|
mutex_lock(&block_subsys_lock);
|
|
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)
|
|
{
|
|
mutex_unlock(&block_subsys_lock);
|
|
}
|
|
|
|
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 %lu %lu %llu %u %lu %lu %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);
|