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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/partitions/check.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/partitions/check.c')
-rw-r--r-- | fs/partitions/check.c | 445 |
1 files changed, 445 insertions, 0 deletions
diff --git a/fs/partitions/check.c b/fs/partitions/check.c new file mode 100644 index 000000000000..31cff785b3bd --- /dev/null +++ b/fs/partitions/check.c @@ -0,0 +1,445 @@ +/* + * 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_NEC98_PARTITION + nec98_partition, /* must be come before `msdos_partition' */ +#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 *); +}; + +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 struct sysfs_ops part_sysfs_ops = { + .show = part_attr_show, +}; + +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_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_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); + + /* 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_del(&disk->kobj); +} |