#include <linux/fs.h>
#include <linux/kmod.h>
#include <linux/ctype.h>
+#include <linux/genhd.h>
#include "check.h"
* a pointer to that same buffer (for convenience).
*/
-char *disk_name(struct gendisk *hd, int part, char *buf)
+char *disk_name(struct gendisk *hd, int partno, char *buf)
{
- if (!part)
+ if (!partno)
snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
- snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, part);
+ snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
else
- snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, part);
+ snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
return buf;
}
const char *bdevname(struct block_device *bdev, char *buf)
{
- int part = MINOR(bdev->bd_dev) - bdev->bd_disk->first_minor;
- return disk_name(bdev->bd_disk, part, buf);
+ int partno = 0;
+
+ if (bdev->bd_part)
+ partno = bdev->bd_part->partno;
+
+ return disk_name(bdev->bd_disk, partno, buf);
}
EXPORT_SYMBOL(bdevname);
if (isdigit(state->name[strlen(state->name)-1]))
sprintf(state->name, "p");
- state->limit = hd->minors;
+ state->limit = disk_max_parts(hd);
i = res = err = 0;
while (!res && check_part[i]) {
memset(&state->parts, 0, sizeof(state->parts));
return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
}
-static ssize_t part_size_show(struct device *dev,
- struct device_attribute *attr, char *buf)
+ssize_t part_size_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
struct hd_struct *p = dev_to_part(dev);
return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
struct device_attribute *attr, char *buf)
{
struct hd_struct *p = dev_to_part(dev);
-
- return sprintf(buf, "%8u %8llu %8u %8llu\n",
- p->ios[0], (unsigned long long)p->sectors[0],
- p->ios[1], (unsigned long long)p->sectors[1]);
+ int cpu;
+
+ cpu = disk_stat_lock();
+ part_round_stats(cpu, p);
+ disk_stat_unlock();
+ return sprintf(buf,
+ "%8lu %8lu %8llu %8u "
+ "%8lu %8lu %8llu %8u "
+ "%8u %8u %8u"
+ "\n",
+ part_stat_read(p, ios[READ]),
+ part_stat_read(p, merges[READ]),
+ (unsigned long long)part_stat_read(p, sectors[READ]),
+ jiffies_to_msecs(part_stat_read(p, ticks[READ])),
+ part_stat_read(p, ios[WRITE]),
+ part_stat_read(p, merges[WRITE]),
+ (unsigned long long)part_stat_read(p, sectors[WRITE]),
+ jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
+ p->in_flight,
+ jiffies_to_msecs(part_stat_read(p, io_ticks)),
+ jiffies_to_msecs(part_stat_read(p, time_in_queue)));
}
#ifdef CONFIG_FAIL_MAKE_REQUEST
static void part_release(struct device *dev)
{
struct hd_struct *p = dev_to_part(dev);
+ free_part_stats(p);
kfree(p);
}
.release = part_release,
};
-static inline void partition_sysfs_add_subdir(struct hd_struct *p)
+static void delete_partition_rcu_cb(struct rcu_head *head)
{
- struct kobject *k;
+ struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
- k = kobject_get(&p->dev.kobj);
- p->holder_dir = kobject_create_and_add("holders", k);
- kobject_put(k);
+ part->start_sect = 0;
+ part->nr_sects = 0;
+ part_stat_set_all(part, 0);
+ put_device(part_to_dev(part));
}
-static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
+void delete_partition(struct gendisk *disk, int partno)
{
- struct kobject *k;
+ struct hd_struct *part;
- k = kobject_get(&disk->dev.kobj);
- disk->holder_dir = kobject_create_and_add("holders", k);
- disk->slave_dir = kobject_create_and_add("slaves", k);
- kobject_put(k);
+ part = disk->__part[partno];
+ if (!part)
+ return;
+
+ blk_free_devt(part_devt(part));
+ rcu_assign_pointer(disk->__part[partno], NULL);
+ kobject_put(part->holder_dir);
+ device_del(part_to_dev(part));
+
+ call_rcu(&part->rcu_head, delete_partition_rcu_cb);
}
-void delete_partition(struct gendisk *disk, int part)
+static ssize_t whole_disk_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
- struct hd_struct *p = disk->part[part-1];
-
- if (!p)
- return;
- if (!p->nr_sects)
- return;
- disk->part[part-1] = NULL;
- p->start_sect = 0;
- p->nr_sects = 0;
- p->ios[0] = p->ios[1] = 0;
- p->sectors[0] = p->sectors[1] = 0;
- kobject_put(p->holder_dir);
- device_del(&p->dev);
- put_device(&p->dev);
+ return 0;
}
+static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
+ whole_disk_show, NULL);
-void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len, int flags)
+int add_partition(struct gendisk *disk, int partno,
+ sector_t start, sector_t len, int flags)
{
struct hd_struct *p;
+ dev_t devt = MKDEV(0, 0);
+ struct device *ddev = disk_to_dev(disk);
+ struct device *pdev;
+ const char *dname;
int err;
+ if (disk->__part[partno])
+ return -EBUSY;
+
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p)
- return;
+ return -ENOMEM;
+
+ if (!init_part_stats(p)) {
+ err = -ENOMEM;
+ goto out_free;
+ }
+ pdev = part_to_dev(p);
p->start_sect = start;
p->nr_sects = len;
- p->partno = part;
- p->policy = disk->policy;
+ p->partno = partno;
+ p->policy = get_disk_ro(disk);
- if (isdigit(disk->dev.bus_id[strlen(disk->dev.bus_id)-1]))
- snprintf(p->dev.bus_id, BUS_ID_SIZE,
- "%sp%d", disk->dev.bus_id, part);
+ dname = dev_name(ddev);
+ if (isdigit(dname[strlen(dname) - 1]))
+ snprintf(pdev->bus_id, BUS_ID_SIZE, "%sp%d", dname, partno);
else
- snprintf(p->dev.bus_id, BUS_ID_SIZE,
- "%s%d", disk->dev.bus_id, part);
+ snprintf(pdev->bus_id, BUS_ID_SIZE, "%s%d", dname, partno);
- device_initialize(&p->dev);
- p->dev.devt = MKDEV(disk->major, disk->first_minor + part);
- p->dev.class = &block_class;
- p->dev.type = &part_type;
- p->dev.parent = &disk->dev;
- disk->part[part-1] = p;
+ device_initialize(pdev);
+ pdev->class = &block_class;
+ pdev->type = &part_type;
+ pdev->parent = ddev;
+
+ err = blk_alloc_devt(p, &devt);
+ if (err)
+ goto out_free;
+ pdev->devt = devt;
/* delay uevent until 'holders' subdir is created */
- p->dev.uevent_suppress = 1;
- device_add(&p->dev);
- partition_sysfs_add_subdir(p);
- p->dev.uevent_suppress = 0;
+ pdev->uevent_suppress = 1;
+ err = device_add(pdev);
+ if (err)
+ goto out_put;
+
+ err = -ENOMEM;
+ p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
+ if (!p->holder_dir)
+ goto out_del;
+
+ pdev->uevent_suppress = 0;
if (flags & ADDPART_FLAG_WHOLEDISK) {
- static struct attribute addpartattr = {
- .name = "whole_disk",
- .mode = S_IRUSR | S_IRGRP | S_IROTH,
- };
- err = sysfs_create_file(&p->dev.kobj, &addpartattr);
+ err = device_create_file(pdev, &dev_attr_whole_disk);
+ if (err)
+ goto out_del;
}
+ /* everything is up and running, commence */
+ INIT_RCU_HEAD(&p->rcu_head);
+ rcu_assign_pointer(disk->__part[partno], p);
+
/* suppress uevent if the disk supresses it */
- if (!disk->dev.uevent_suppress)
- kobject_uevent(&p->dev.kobj, KOBJ_ADD);
+ if (!ddev->uevent_suppress)
+ kobject_uevent(&pdev->kobj, KOBJ_ADD);
+
+ return 0;
+
+out_free:
+ kfree(p);
+ return err;
+out_del:
+ kobject_put(p->holder_dir);
+ device_del(pdev);
+out_put:
+ put_device(pdev);
+ blk_free_devt(devt);
+ return err;
}
/* Not exported, helper to add_disk(). */
void register_disk(struct gendisk *disk)
{
+ struct device *ddev = disk_to_dev(disk);
struct block_device *bdev;
+ struct disk_part_iter piter;
+ struct hd_struct *part;
char *s;
- int i;
- struct hd_struct *p;
int err;
- disk->dev.parent = disk->driverfs_dev;
- disk->dev.devt = MKDEV(disk->major, disk->first_minor);
+ ddev->parent = disk->driverfs_dev;
- strlcpy(disk->dev.bus_id, disk->disk_name, KOBJ_NAME_LEN);
+ strlcpy(ddev->bus_id, disk->disk_name, BUS_ID_SIZE);
/* ewww... some of these buggers have / in the name... */
- s = strchr(disk->dev.bus_id, '/');
+ s = strchr(ddev->bus_id, '/');
if (s)
*s = '!';
/* delay uevents, until we scanned partition table */
- disk->dev.uevent_suppress = 1;
+ ddev->uevent_suppress = 1;
- if (device_add(&disk->dev))
+ if (device_add(ddev))
return;
#ifndef CONFIG_SYSFS_DEPRECATED
- err = sysfs_create_link(block_depr, &disk->dev.kobj,
- kobject_name(&disk->dev.kobj));
+ err = sysfs_create_link(block_depr, &ddev->kobj,
+ kobject_name(&ddev->kobj));
if (err) {
- device_del(&disk->dev);
+ device_del(ddev);
return;
}
#endif
- disk_sysfs_add_subdirs(disk);
+ disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
+ disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
/* No minors to use for partitions */
- if (disk->minors == 1)
+ if (!disk_partitionable(disk))
goto exit;
/* No such device (e.g., media were just removed) */
exit:
/* announce disk after possible partitions are created */
- disk->dev.uevent_suppress = 0;
- kobject_uevent(&disk->dev.kobj, KOBJ_ADD);
+ ddev->uevent_suppress = 0;
+ kobject_uevent(&ddev->kobj, KOBJ_ADD);
/* announce possible partitions */
- for (i = 1; i < disk->minors; i++) {
- p = disk->part[i-1];
- if (!p || !p->nr_sects)
- continue;
- kobject_uevent(&p->dev.kobj, KOBJ_ADD);
- }
+ disk_part_iter_init(&piter, disk, 0);
+ while ((part = disk_part_iter_next(&piter)))
+ kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
+ disk_part_iter_exit(&piter);
}
int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
{
+ struct disk_part_iter piter;
+ struct hd_struct *part;
struct parsed_partitions *state;
int p, res;
if (res)
return res;
bdev->bd_invalidated = 0;
- for (p = 1; p < disk->minors; p++)
- delete_partition(disk, p);
+
+ disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
+ while ((part = disk_part_iter_next(&piter)))
+ delete_partition(disk, part->partno);
+ disk_part_iter_exit(&piter);
+
if (disk->fops->revalidate_disk)
disk->fops->revalidate_disk(disk);
if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
return 0;
if (IS_ERR(state)) /* I/O error reading the partition table */
return -EIO;
+
+ /* tell userspace that the media / partition table may have changed */
+ kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
+
for (p = 1; p < state->limit; p++) {
sector_t size = state->parts[p].size;
sector_t from = state->parts[p].from;
if (!size)
continue;
if (from + size > get_capacity(disk)) {
- printk(" %s: p%d exceeds device capacity\n",
+ printk(KERN_WARNING
+ "%s: p%d exceeds device capacity\n",
disk->disk_name, p);
}
- add_partition(disk, p, from, size, state->parts[p].flags);
+ res = add_partition(disk, p, from, size, state->parts[p].flags);
+ if (res) {
+ printk(KERN_ERR " %s: p%d could not be added: %d\n",
+ disk->disk_name, p, -res);
+ continue;
+ }
#ifdef CONFIG_BLK_DEV_MD
if (state->parts[p].flags & ADDPART_FLAG_RAID)
md_autodetect_dev(bdev->bd_dev+p);
void del_gendisk(struct gendisk *disk)
{
- int p;
+ struct disk_part_iter piter;
+ struct hd_struct *part;
/* invalidate stuff */
- for (p = disk->minors - 1; p > 0; p--) {
- invalidate_partition(disk, p);
- delete_partition(disk, p);
+ disk_part_iter_init(&piter, disk,
+ DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
+ while ((part = disk_part_iter_next(&piter))) {
+ invalidate_partition(disk, part->partno);
+ delete_partition(disk, part->partno);
}
+ disk_part_iter_exit(&piter);
+
invalidate_partition(disk, 0);
- disk->capacity = 0;
+ set_capacity(disk, 0);
disk->flags &= ~GENHD_FL_UP;
unlink_gendisk(disk);
disk_stat_set_all(disk, 0);
disk->stamp = 0;
- kobject_put(disk->holder_dir);
+ kobject_put(disk->part0.holder_dir);
kobject_put(disk->slave_dir);
disk->driverfs_dev = NULL;
#ifndef CONFIG_SYSFS_DEPRECATED
- sysfs_remove_link(block_depr, disk->dev.bus_id);
+ sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
#endif
- device_del(&disk->dev);
+ device_del(disk_to_dev(disk));
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff