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!

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);
+}