/* * 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/slab.h> #include <linux/kmod.h> #include <linux/ctype.h> #include <linux/genhd.h> #include <linux/blktrace_api.h> #include "check.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" #include "karma.h" #include "sysv68.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 *) = { /* * 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 #ifdef CONFIG_KARMA_PARTITION karma_partition, #endif #ifdef CONFIG_SYSV68_PARTITION sysv68_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 partno, char *buf) { 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, partno); else snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno); return buf; } const char *bdevname(struct block_device *bdev, char *buf) { return disk_name(bdev->bd_disk, bdev->bd_part->partno, 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, err; state = kzalloc(sizeof(struct parsed_partitions), GFP_KERNEL); if (!state) return NULL; state->bdev = bdev; 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 = 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); 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 (state->access_beyond_eod) err = -ENOSPC; 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 ERR_PTR(res); } static ssize_t part_partition_show(struct device *dev, struct device_attribute *attr, char *buf) { struct hd_struct *p = dev_to_part(dev); return sprintf(buf, "%d\n", p->partno); } static ssize_t part_start_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->start_sect); } 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); } ssize_t part_alignment_offset_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->alignment_offset); } ssize_t part_discard_alignment_show(struct device *dev, struct device_attribute *attr, char *buf) { struct hd_struct *p = dev_to_part(dev); return sprintf(buf, "%u\n", p->discard_alignment); } ssize_t part_stat_show(struct device *dev, struct device_attribute *attr, char *buf) { 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])), part_in_flight(p), jiffies_to_msecs(part_stat_read(p, io_ticks)), jiffies_to_msecs(part_stat_read(p, time_in_queue))); } ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr, char *buf) { struct hd_struct *p = dev_to_part(dev); return sprintf(buf, "%8u %8u\n", p->in_flight[0], p->in_flight[1]); } #ifdef CONFIG_FAIL_MAKE_REQUEST ssize_t part_fail_show(struct device *dev, struct device_attribute *attr, char *buf) { struct hd_struct *p = dev_to_part(dev); return sprintf(buf, "%d\n", p->make_it_fail); } ssize_t part_fail_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { 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; } #endif static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL); static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL); static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL); static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show, NULL); static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_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_partition.attr, &dev_attr_start.attr, &dev_attr_size.attr, &dev_attr_alignment_offset.attr, &dev_attr_discard_alignment.attr, &dev_attr_stat.attr, &dev_attr_inflight.attr, #ifdef CONFIG_FAIL_MAKE_REQUEST &dev_attr_fail.attr, #endif NULL }; static struct attribute_group part_attr_group = { .attrs = part_attrs, }; static const struct attribute_group *part_attr_groups[] = { &part_attr_group, #ifdef CONFIG_BLK_DEV_IO_TRACE &blk_trace_attr_group, #endif NULL }; static void part_release(struct device *dev) { struct hd_struct *p = dev_to_part(dev); free_part_stats(p); kfree(p); } struct device_type part_type = { .name = "partition", .groups = part_attr_groups, .release = part_release, }; static void delete_partition_rcu_cb(struct rcu_head *head) { 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; part = ptbl->part[partno]; if (!part) return; blk_free_devt(part_devt(part)); rcu_assign_pointer(ptbl->part[partno], NULL); rcu_assign_pointer(ptbl->last_lookup, NULL); kobject_put(part->holder_dir); device_del(part_to_dev(part)); call_rcu(&part->rcu_head, delete_partition_rcu_cb); } 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); struct hd_struct *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_PTR(err); ptbl = disk->part_tbl; if (ptbl->part[partno]) return ERR_PTR(-EBUSY); p = kzalloc(sizeof(*p), GFP_KERNEL); if (!p) return ERR_PTR(-EBUSY); if (!init_part_stats(p)) { err = -ENOMEM; goto out_free; } pdev = part_to_dev(p); p->start_sect = start; p->alignment_offset = queue_limit_alignment_offset(&disk->queue->limits, start); p->discard_alignment = queue_limit_discard_alignment(&disk->queue->limits, start); p->nr_sects = len; p->partno = partno; p->policy = get_disk_ro(disk); dname = dev_name(ddev); if (isdigit(dname[strlen(dname) - 1])) dev_set_name(pdev, "%sp%d", dname, partno); else dev_set_name(pdev, "%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_stats; pdev->devt = devt; /* delay uevent until 'holders' subdir is created */ dev_set_uevent_suppress(pdev, 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; dev_set_uevent_suppress(pdev, 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 (!dev_get_uevent_suppress(ddev)) kobject_uevent(&pdev->kobj, KOBJ_ADD); return p; out_free_stats: free_part_stats(p); out_free: kfree(p); return ERR_PTR(err); out_del: kobject_put(p->holder_dir); device_del(pdev); out_put: put_device(pdev); blk_free_devt(devt); return ERR_PTR(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; int err; ddev->parent = disk->driverfs_dev; dev_set_name(ddev, disk->disk_name); /* delay uevents, until we scanned partition table */ dev_set_uevent_suppress(ddev, 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); /* 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)) goto exit; bdev = bdget_disk(disk, 0); if (!bdev) goto exit; bdev->bd_invalidated = 1; err = blkdev_get(bdev, FMODE_READ); if (err < 0) goto exit; blkdev_put(bdev, FMODE_READ); exit: /* announce disk after possible partitions are created */ dev_set_uevent_suppress(ddev, 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); } static bool disk_unlock_native_capacity(struct gendisk *disk) { const struct block_device_operations *bdops = disk->fops; if (bdops->unlock_native_capacity && !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) { printk(KERN_CONT "enabling native capacity\n"); bdops->unlock_native_capacity(disk); disk->flags |= GENHD_FL_NATIVE_CAPACITY; return true; } else { printk(KERN_CONT "truncated\n"); return false; } } int rescan_partitions(struct gendisk *disk, struct block_device *bdev) { struct parsed_partitions *state = NULL; struct disk_part_iter piter; struct hd_struct *part; int p, highest, res; rescan: if (state && !IS_ERR(state)) { kfree(state); state = NULL; } if (bdev->bd_part_count) return -EBUSY; res = invalidate_partition(disk, 0); if (res) return res; 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); check_disk_size_change(disk, bdev); bdev->bd_invalidated = 0; if (!get_capacity(disk) || !(state = check_partition(disk, bdev))) return 0; if (IS_ERR(state)) { /* * I/O error reading the partition table. If any * partition code tried to read beyond EOD, retry * after unlocking native capacity. */ if (PTR_ERR(state) == -ENOSPC) { printk(KERN_WARNING "%s: partition table beyond EOD, ", disk->disk_name); if (disk_unlock_native_capacity(disk)) goto rescan; } return -EIO; } /* * If any partition code tried to read beyond EOD, try * unlocking native capacity even if partition table is * sucessfully read as we could be missing some partitions. */ if (state->access_beyond_eod) { printk(KERN_WARNING "%s: partition table partially beyond EOD, ", disk->disk_name); if (disk_unlock_native_capacity(disk)) goto rescan; } /* 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, from; size = state->parts[p].size; if (!size) continue; from = state->parts[p].from; if (from >= get_capacity(disk)) { printk(KERN_WARNING "%s: p%d start %llu is beyond EOD, ", disk->disk_name, p, (unsigned long long) from); if (disk_unlock_native_capacity(disk)) goto rescan; continue; } if (from + size > get_capacity(disk)) { printk(KERN_WARNING "%s: p%d size %llu extends beyond EOD, ", disk->disk_name, p, (unsigned long long) size); if (disk_unlock_native_capacity(disk)) { /* free state and restart */ goto rescan; } else { /* * we can not ignore partitions of broken tables * created by for example camera firmware, but * we limit them to the end of the disk to avoid * creating invalid block devices */ size = get_capacity(disk) - from; } } part = add_partition(disk, p, from, size, state->parts[p].flags); if (IS_ERR(part)) { printk(KERN_ERR " %s: p%d could not be added: %ld\n", disk->disk_name, p, -PTR_ERR(part)); continue; } #ifdef CONFIG_BLK_DEV_MD if (state->parts[p].flags & ADDPART_FLAG_RAID) md_autodetect_dev(part_to_dev(part)->devt); #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_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)), NULL); if (!IS_ERR(page)) { 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) { struct disk_part_iter piter; struct hd_struct *part; /* invalidate stuff */ 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); blk_free_devt(disk_to_dev(disk)->devt); set_capacity(disk, 0); disk->flags &= ~GENHD_FL_UP; unlink_gendisk(disk); 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)); }