#include <linux/fs.h>
#include <linux/kmod.h>
#include <linux/ctype.h>
-#include <linux/devfs_fs_kernel.h>
+#include <linux/genhd.h>
#include "check.h"
-#include "devfs.h"
#include "acorn.h"
#include "amiga.h"
#include "ibm.h"
#include "ultrix.h"
#include "efi.h"
+#include "karma.h"
+#include "sysv68.h"
#ifdef CONFIG_BLK_DEV_MD
extern void md_autodetect_dev(dev_t dev);
#ifdef CONFIG_IBM_PARTITION
ibm_partition,
#endif
+#ifdef CONFIG_KARMA_PARTITION
+ karma_partition,
+#endif
+#ifdef CONFIG_SYSV68_PARTITION
+ sysv68_partition,
+#endif
NULL
};
* 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);
+ return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
}
EXPORT_SYMBOL(bdevname);
check_partition(struct gendisk *hd, struct block_device *bdev)
{
struct parsed_partitions *state;
- int i, res;
+ int i, res, err;
state = kmalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
if (!state)
return NULL;
-#ifdef CONFIG_DEVFS_FS
- if (hd->devfs_name[0] != '\0') {
- printk(KERN_INFO " /dev/%s:", hd->devfs_name);
+ disk_name(hd, 0, state->name);
+ printk(KERN_INFO " %s:", state->name);
+ if (isdigit(state->name[strlen(state->name)-1]))
sprintf(state->name, "p");
- }
-#endif
- else {
- disk_name(hd, 0, state->name);
- printk(KERN_INFO " %s:", state->name);
- if (isdigit(state->name[strlen(state->name)-1]))
- sprintf(state->name, "p");
- }
- state->limit = hd->minors;
- i = res = 0;
+
+ state->limit = disk_max_parts(hd);
+ i = res = err = 0;
while (!res && check_part[i]) {
memset(&state->parts, 0, sizeof(state->parts));
res = check_part[i++](state, bdev);
+ if (res < 0) {
+ /* We have hit an I/O error which we don't report now.
+ * But record it, and let the others do their job.
+ */
+ err = res;
+ res = 0;
+ }
+
}
if (res > 0)
return state;
+ if (err)
+ /* The partition is unrecognized. So report I/O errors if there were any */
+ res = err;
if (!res)
printk(" unknown partition table\n");
else if (warn_no_part)
printk(" unable to read partition table\n");
kfree(state);
- return NULL;
+ return ERR_PTR(res);
}
-/*
- * sysfs bindings for partitions
- */
-
-struct part_attribute {
- struct attribute attr;
- ssize_t (*show)(struct hd_struct *,char *);
- ssize_t (*store)(struct hd_struct *,const char *, size_t);
-};
-
-static ssize_t
-part_attr_show(struct kobject * kobj, struct attribute * attr, char * page)
-{
- struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
- struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
- ssize_t ret = 0;
- if (part_attr->show)
- ret = part_attr->show(p, page);
- return ret;
-}
-static ssize_t
-part_attr_store(struct kobject * kobj, struct attribute * attr,
- const char *page, size_t count)
+static ssize_t part_start_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
- struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
- struct part_attribute * part_attr = container_of(attr,struct part_attribute,attr);
- ssize_t ret = 0;
+ struct hd_struct *p = dev_to_part(dev);
- if (part_attr->store)
- ret = part_attr->store(p, page, count);
- return ret;
+ return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
}
-static struct sysfs_ops part_sysfs_ops = {
- .show = part_attr_show,
- .store = part_attr_store,
-};
-
-static ssize_t part_uevent_store(struct hd_struct * p,
- const char *page, size_t count)
-{
- kobject_hotplug(&p->kobj, KOBJ_ADD);
- return count;
-}
-static ssize_t part_dev_read(struct hd_struct * p, char *page)
+ssize_t part_size_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
- struct gendisk *disk = container_of(p->kobj.parent,struct gendisk,kobj);
- dev_t dev = MKDEV(disk->major, disk->first_minor + p->partno);
- return print_dev_t(page, dev);
+ struct hd_struct *p = dev_to_part(dev);
+ return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
}
-static ssize_t part_start_read(struct hd_struct * p, char *page)
+
+ssize_t part_stat_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
- return sprintf(page, "%llu\n",(unsigned long long)p->start_sect);
+ struct hd_struct *p = dev_to_part(dev);
+ int cpu;
+
+ cpu = part_stat_lock();
+ part_round_stats(cpu, p);
+ part_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)));
}
-static ssize_t part_size_read(struct hd_struct * p, char *page)
+
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+ssize_t part_fail_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
- return sprintf(page, "%llu\n",(unsigned long long)p->nr_sects);
+ struct hd_struct *p = dev_to_part(dev);
+
+ return sprintf(buf, "%d\n", p->make_it_fail);
}
-static ssize_t part_stat_read(struct hd_struct * p, char *page)
+
+ssize_t part_fail_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
{
- return sprintf(page, "%8u %8llu %8u %8llu\n",
- p->reads, (unsigned long long)p->read_sectors,
- p->writes, (unsigned long long)p->write_sectors);
+ struct hd_struct *p = dev_to_part(dev);
+ int i;
+
+ if (count > 0 && sscanf(buf, "%d", &i) > 0)
+ p->make_it_fail = (i == 0) ? 0 : 1;
+
+ return count;
}
-static struct part_attribute part_attr_uevent = {
- .attr = {.name = "uevent", .mode = S_IWUSR },
- .store = part_uevent_store
-};
-static struct part_attribute part_attr_dev = {
- .attr = {.name = "dev", .mode = S_IRUGO },
- .show = part_dev_read
-};
-static struct part_attribute part_attr_start = {
- .attr = {.name = "start", .mode = S_IRUGO },
- .show = part_start_read
-};
-static struct part_attribute part_attr_size = {
- .attr = {.name = "size", .mode = S_IRUGO },
- .show = part_size_read
-};
-static struct part_attribute part_attr_stat = {
- .attr = {.name = "stat", .mode = S_IRUGO },
- .show = part_stat_read
+#endif
+
+static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
+static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
+static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+static struct device_attribute dev_attr_fail =
+ __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
+#endif
+
+static struct attribute *part_attrs[] = {
+ &dev_attr_start.attr,
+ &dev_attr_size.attr,
+ &dev_attr_stat.attr,
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+ &dev_attr_fail.attr,
+#endif
+ NULL
};
-static struct attribute * default_attrs[] = {
- &part_attr_uevent.attr,
- &part_attr_dev.attr,
- &part_attr_start.attr,
- &part_attr_size.attr,
- &part_attr_stat.attr,
- NULL,
+static struct attribute_group part_attr_group = {
+ .attrs = part_attrs,
};
-extern struct subsystem block_subsys;
+static struct attribute_group *part_attr_groups[] = {
+ &part_attr_group,
+ NULL
+};
-static void part_release(struct kobject *kobj)
+static void part_release(struct device *dev)
{
- struct hd_struct * p = container_of(kobj,struct hd_struct,kobj);
+ struct hd_struct *p = dev_to_part(dev);
+ free_part_stats(p);
kfree(p);
}
-struct kobj_type ktype_part = {
+struct device_type part_type = {
+ .name = "partition",
+ .groups = part_attr_groups,
.release = part_release,
- .default_attrs = default_attrs,
- .sysfs_ops = &part_sysfs_ops,
};
-void delete_partition(struct gendisk *disk, int part)
+static void delete_partition_rcu_cb(struct rcu_head *head)
{
- struct hd_struct *p = disk->part[part-1];
- if (!p)
+ struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
+
+ part->start_sect = 0;
+ part->nr_sects = 0;
+ part_stat_set_all(part, 0);
+ put_device(part_to_dev(part));
+}
+
+void delete_partition(struct gendisk *disk, int partno)
+{
+ struct disk_part_tbl *ptbl = disk->part_tbl;
+ struct hd_struct *part;
+
+ if (partno >= ptbl->len)
return;
- if (!p->nr_sects)
+
+ part = ptbl->part[partno];
+ if (!part)
return;
- disk->part[part-1] = NULL;
- p->start_sect = 0;
- p->nr_sects = 0;
- p->reads = p->writes = p->read_sectors = p->write_sectors = 0;
- devfs_remove("%s/part%d", disk->devfs_name, part);
- kobject_unregister(&p->kobj);
+
+ blk_free_devt(part_devt(part));
+ rcu_assign_pointer(ptbl->part[partno], NULL);
+ kobject_put(part->holder_dir);
+ device_del(part_to_dev(part));
+
+ call_rcu(&part->rcu_head, delete_partition_rcu_cb);
}
-void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len)
+static ssize_t whole_disk_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return 0;
+}
+static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
+ whole_disk_show, NULL);
+
+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;
+ struct disk_part_tbl *ptbl;
+ const char *dname;
+ int err;
+
+ err = disk_expand_part_tbl(disk, partno);
+ if (err)
+ return err;
+ ptbl = disk->part_tbl;
- p = kmalloc(sizeof(*p), GFP_KERNEL);
+ if (ptbl->part[partno])
+ return -EBUSY;
+
+ p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p)
- return;
-
- memset(p, 0, sizeof(*p));
+ 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->partno = partno;
+ p->policy = get_disk_ro(disk);
- devfs_mk_bdev(MKDEV(disk->major, disk->first_minor + part),
- S_IFBLK|S_IRUSR|S_IWUSR,
- "%s/part%d", disk->devfs_name, part);
-
- if (isdigit(disk->kobj.name[strlen(disk->kobj.name)-1]))
- snprintf(p->kobj.name,KOBJ_NAME_LEN,"%sp%d",disk->kobj.name,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->kobj.name,KOBJ_NAME_LEN,"%s%d",disk->kobj.name,part);
- p->kobj.parent = &disk->kobj;
- p->kobj.ktype = &ktype_part;
- kobject_register(&p->kobj);
- disk->part[part-1] = p;
-}
-
-static void disk_sysfs_symlinks(struct gendisk *disk)
-{
- struct device *target = get_device(disk->driverfs_dev);
- if (target) {
- sysfs_create_link(&disk->kobj,&target->kobj,"device");
- sysfs_create_link(&target->kobj,&disk->kobj,"block");
+ snprintf(pdev->bus_id, BUS_ID_SIZE, "%s%d", dname, partno);
+
+ 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 */
+ 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) {
+ 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(ptbl->part[partno], p);
+
+ /* suppress uevent if the disk supresses it */
+ 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 err;
- strlcpy(disk->kobj.name,disk->disk_name,KOBJ_NAME_LEN);
- /* ewww... some of these buggers have / in name... */
- s = strchr(disk->kobj.name, '/');
+ ddev->parent = disk->driverfs_dev;
+
+ strlcpy(ddev->bus_id, disk->disk_name, BUS_ID_SIZE);
+ /* ewww... some of these buggers have / in the name... */
+ s = strchr(ddev->bus_id, '/');
if (s)
*s = '!';
- if ((err = kobject_add(&disk->kobj)))
- return;
- disk_sysfs_symlinks(disk);
- kobject_hotplug(&disk->kobj, KOBJ_ADD);
- /* No minors to use for partitions */
- if (disk->minors == 1) {
- if (disk->devfs_name[0] != '\0')
- devfs_add_disk(disk);
+ /* delay uevents, until we scanned partition table */
+ ddev->uevent_suppress = 1;
+
+ if (device_add(ddev))
+ return;
+#ifndef CONFIG_SYSFS_DEPRECATED
+ err = sysfs_create_link(block_depr, &ddev->kobj,
+ kobject_name(&ddev->kobj));
+ if (err) {
+ device_del(ddev);
return;
}
+#endif
+ disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj);
+ disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
- /* always add handle for the whole disk */
- devfs_add_partitioned(disk);
+ /* No minors to use for partitions */
+ if (!disk_partitionable(disk))
+ goto exit;
/* No such device (e.g., media were just removed) */
if (!get_capacity(disk))
- return;
+ goto exit;
bdev = bdget_disk(disk, 0);
if (!bdev)
- return;
+ goto exit;
bdev->bd_invalidated = 1;
- if (blkdev_get(bdev, FMODE_READ, 0) < 0)
- return;
+ err = blkdev_get(bdev, FMODE_READ, 0);
+ if (err < 0)
+ goto exit;
blkdev_put(bdev);
+
+exit:
+ /* announce disk after possible partitions are created */
+ ddev->uevent_suppress = 0;
+ kobject_uevent(&ddev->kobj, KOBJ_ADD);
+
+ /* announce possible partitions */
+ 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;
+ int p, highest, res;
if (bdev->bd_part_count)
return -EBUSY;
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);
+
+ /* Detect the highest partition number and preallocate
+ * disk->part_tbl. This is an optimization and not strictly
+ * necessary.
+ */
+ for (p = 1, highest = 0; p < state->limit; p++)
+ if (state->parts[p].size)
+ highest = p;
+
+ disk_expand_part_tbl(disk, highest);
+
+ /* add partitions */
for (p = 1; p < state->limit; p++) {
sector_t size = state->parts[p].size;
sector_t from = state->parts[p].from;
if (!size)
continue;
- add_partition(disk, p, from, size);
+ if (from + size > get_capacity(disk)) {
+ printk(KERN_WARNING
+ "%s: p%d exceeds device capacity\n",
+ disk->disk_name, p);
+ }
+ 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)
+ if (state->parts[p].flags & ADDPART_FLAG_RAID)
md_autodetect_dev(bdev->bd_dev+p);
#endif
}
struct address_space *mapping = bdev->bd_inode->i_mapping;
struct page *page;
- page = read_cache_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
- (filler_t *)mapping->a_ops->readpage, NULL);
+ page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
+ NULL);
if (!IS_ERR(page)) {
- wait_on_page_locked(page);
- if (!PageUptodate(page))
- goto fail;
if (PageError(page))
goto fail;
p->v = page;
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;
-
- devfs_remove_disk(disk);
-
- if (disk->driverfs_dev) {
- sysfs_remove_link(&disk->kobj, "device");
- sysfs_remove_link(&disk->driverfs_dev->kobj, "block");
- put_device(disk->driverfs_dev);
- }
- kobject_hotplug(&disk->kobj, KOBJ_REMOVE);
- kobject_del(&disk->kobj);
+ part_stat_set_all(&disk->part0, 0);
+ disk->part0.stamp = 0;
+
+ kobject_put(disk->part0.holder_dir);
+ kobject_put(disk->slave_dir);
+ disk->driverfs_dev = NULL;
+#ifndef CONFIG_SYSFS_DEPRECATED
+ sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk)));
+#endif
+ device_del(disk_to_dev(disk));
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff