| /* |
| * fs/partitions/check.c |
| * |
| * Code extracted from drivers/block/genhd.c |
| * Copyright (C) 1991-1998 Linus Torvalds |
| * Re-organised Feb 1998 Russell King |
| * |
| * We now have independent partition support from the |
| * block drivers, which allows all the partition code to |
| * be grouped in one location, and it to be mostly self |
| * contained. |
| * |
| * Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl} |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/fs.h> |
| #include <linux/kmod.h> |
| #include <linux/ctype.h> |
| #include <linux/devfs_fs_kernel.h> |
| |
| #include "check.h" |
| #include "devfs.h" |
| |
| #include "acorn.h" |
| #include "amiga.h" |
| #include "atari.h" |
| #include "ldm.h" |
| #include "mac.h" |
| #include "msdos.h" |
| #include "osf.h" |
| #include "sgi.h" |
| #include "sun.h" |
| #include "ibm.h" |
| #include "ultrix.h" |
| #include "efi.h" |
| |
| #ifdef CONFIG_BLK_DEV_MD |
| extern void md_autodetect_dev(dev_t dev); |
| #endif |
| |
| int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/ |
| |
| static int (*check_part[])(struct parsed_partitions *, struct block_device *) = { |
| /* |
| * Probe partition formats with tables at disk address 0 |
| * that also have an ADFS boot block at 0xdc0. |
| */ |
| #ifdef CONFIG_ACORN_PARTITION_ICS |
| adfspart_check_ICS, |
| #endif |
| #ifdef CONFIG_ACORN_PARTITION_POWERTEC |
| adfspart_check_POWERTEC, |
| #endif |
| #ifdef CONFIG_ACORN_PARTITION_EESOX |
| adfspart_check_EESOX, |
| #endif |
| |
| /* |
| * Now move on to formats that only have partition info at |
| * disk address 0xdc0. Since these may also have stale |
| * PC/BIOS partition tables, they need to come before |
| * the msdos entry. |
| */ |
| #ifdef CONFIG_ACORN_PARTITION_CUMANA |
| adfspart_check_CUMANA, |
| #endif |
| #ifdef CONFIG_ACORN_PARTITION_ADFS |
| adfspart_check_ADFS, |
| #endif |
| |
| #ifdef CONFIG_EFI_PARTITION |
| efi_partition, /* this must come before msdos */ |
| #endif |
| #ifdef CONFIG_SGI_PARTITION |
| sgi_partition, |
| #endif |
| #ifdef CONFIG_LDM_PARTITION |
| ldm_partition, /* this must come before msdos */ |
| #endif |
| #ifdef CONFIG_MSDOS_PARTITION |
| msdos_partition, |
| #endif |
| #ifdef CONFIG_OSF_PARTITION |
| osf_partition, |
| #endif |
| #ifdef CONFIG_SUN_PARTITION |
| sun_partition, |
| #endif |
| #ifdef CONFIG_AMIGA_PARTITION |
| amiga_partition, |
| #endif |
| #ifdef CONFIG_ATARI_PARTITION |
| atari_partition, |
| #endif |
| #ifdef CONFIG_MAC_PARTITION |
| mac_partition, |
| #endif |
| #ifdef CONFIG_ULTRIX_PARTITION |
| ultrix_partition, |
| #endif |
| #ifdef CONFIG_IBM_PARTITION |
| ibm_partition, |
| #endif |
| NULL |
| }; |
| |
| /* |
| * disk_name() is used by partition check code and the genhd driver. |
| * It formats the devicename of the indicated disk into |
| * the supplied buffer (of size at least 32), and returns |
| * a pointer to that same buffer (for convenience). |
| */ |
| |
| char *disk_name(struct gendisk *hd, int part, char *buf) |
| { |
| if (!part) |
| 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); |
| else |
| snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, part); |
| |
| 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); |
| } |
| |
| EXPORT_SYMBOL(bdevname); |
| |
| /* |
| * There's very little reason to use this, you should really |
| * have a struct block_device just about everywhere and use |
| * bdevname() instead. |
| */ |
| const char *__bdevname(dev_t dev, char *buffer) |
| { |
| scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)", |
| MAJOR(dev), MINOR(dev)); |
| return buffer; |
| } |
| |
| EXPORT_SYMBOL(__bdevname); |
| |
| static struct parsed_partitions * |
| check_partition(struct gendisk *hd, struct block_device *bdev) |
| { |
| struct parsed_partitions *state; |
| int i, res; |
| |
| 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); |
| 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; |
| while (!res && check_part[i]) { |
| memset(&state->parts, 0, sizeof(state->parts)); |
| res = check_part[i++](state, bdev); |
| } |
| if (res > 0) |
| return state; |
| if (!res) |
| printk(" unknown partition table\n"); |
| else if (warn_no_part) |
| printk(" unable to read partition table\n"); |
| kfree(state); |
| return NULL; |
| } |
| |
| /* |
| * 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) |
| { |
| 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->store) |
| ret = part_attr->store(p, page, count); |
| return ret; |
| } |
| |
| 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) |
| { |
| 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); |
| } |
| static ssize_t part_start_read(struct hd_struct * p, char *page) |
| { |
| return sprintf(page, "%llu\n",(unsigned long long)p->start_sect); |
| } |
| static ssize_t part_size_read(struct hd_struct * p, char *page) |
| { |
| return sprintf(page, "%llu\n",(unsigned long long)p->nr_sects); |
| } |
| static ssize_t part_stat_read(struct hd_struct * p, char *page) |
| { |
| return sprintf(page, "%8u %8llu %8u %8llu\n", |
| p->reads, (unsigned long long)p->read_sectors, |
| p->writes, (unsigned long long)p->write_sectors); |
| } |
| 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 |
| }; |
| |
| 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, |
| }; |
| |
| extern struct subsystem block_subsys; |
| |
| static void part_release(struct kobject *kobj) |
| { |
| struct hd_struct * p = container_of(kobj,struct hd_struct,kobj); |
| kfree(p); |
| } |
| |
| struct kobj_type ktype_part = { |
| .release = part_release, |
| .default_attrs = default_attrs, |
| .sysfs_ops = &part_sysfs_ops, |
| }; |
| |
| void delete_partition(struct gendisk *disk, int part) |
| { |
| 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->reads = p->writes = p->read_sectors = p->write_sectors = 0; |
| devfs_remove("%s/part%d", disk->devfs_name, part); |
| kobject_unregister(&p->kobj); |
| } |
| |
| void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len) |
| { |
| struct hd_struct *p; |
| |
| p = kmalloc(sizeof(*p), GFP_KERNEL); |
| if (!p) |
| return; |
| |
| memset(p, 0, sizeof(*p)); |
| p->start_sect = start; |
| p->nr_sects = len; |
| p->partno = part; |
| |
| 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); |
| 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"); |
| } |
| } |
| |
| /* Not exported, helper to add_disk(). */ |
| void register_disk(struct gendisk *disk) |
| { |
| struct block_device *bdev; |
| 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, '/'); |
| 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); |
| return; |
| } |
| |
| /* always add handle for the whole disk */ |
| devfs_add_partitioned(disk); |
| |
| /* No such device (e.g., media were just removed) */ |
| if (!get_capacity(disk)) |
| return; |
| |
| bdev = bdget_disk(disk, 0); |
| if (!bdev) |
| return; |
| |
| bdev->bd_invalidated = 1; |
| if (blkdev_get(bdev, FMODE_READ, 0) < 0) |
| return; |
| blkdev_put(bdev); |
| } |
| |
| int rescan_partitions(struct gendisk *disk, struct block_device *bdev) |
| { |
| struct parsed_partitions *state; |
| int p, res; |
| |
| if (bdev->bd_part_count) |
| return -EBUSY; |
| res = invalidate_partition(disk, 0); |
| if (res) |
| return res; |
| bdev->bd_invalidated = 0; |
| for (p = 1; p < disk->minors; p++) |
| delete_partition(disk, p); |
| if (disk->fops->revalidate_disk) |
| disk->fops->revalidate_disk(disk); |
| if (!get_capacity(disk) || !(state = check_partition(disk, bdev))) |
| return 0; |
| 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); |
| #ifdef CONFIG_BLK_DEV_MD |
| if (state->parts[p].flags) |
| md_autodetect_dev(bdev->bd_dev+p); |
| #endif |
| } |
| kfree(state); |
| return 0; |
| } |
| |
| unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p) |
| { |
| 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); |
| if (!IS_ERR(page)) { |
| wait_on_page_locked(page); |
| if (!PageUptodate(page)) |
| goto fail; |
| if (PageError(page)) |
| goto fail; |
| p->v = page; |
| return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9); |
| fail: |
| page_cache_release(page); |
| } |
| p->v = NULL; |
| return NULL; |
| } |
| |
| EXPORT_SYMBOL(read_dev_sector); |
| |
| void del_gendisk(struct gendisk *disk) |
| { |
| int p; |
| |
| /* invalidate stuff */ |
| for (p = disk->minors - 1; p > 0; p--) { |
| invalidate_partition(disk, p); |
| delete_partition(disk, p); |
| } |
| invalidate_partition(disk, 0); |
| disk->capacity = 0; |
| disk->flags &= ~GENHD_FL_UP; |
| unlink_gendisk(disk); |
| disk_stat_set_all(disk, 0); |
| disk->stamp = disk->stamp_idle = 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); |
| } |