Driver core: convert block from raw kobjects to core devices

This moves the block devices to /sys/class/block. It will create a
flat list of all block devices, with the disks and partitions in one
directory. For compatibility /sys/block is created and contains symlinks
to the disks.

  /sys/class/block
  |-- sda -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda
  |-- sda1 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda1
  |-- sda10 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda10
  |-- sda5 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda5
  |-- sda6 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda6
  |-- sda7 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda7
  |-- sda8 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda8
  |-- sda9 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda9
  `-- sr0 -> ../../devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sr0

  /sys/block/
  |-- sda -> ../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda
  `-- sr0 -> ../devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sr0

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 105 insertions, 210 deletions

diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 9184215f3ef3..97f3f5f064ee 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -195,96 +195,45 @@ check_partition(struct gendisk *hd, struct block_device *bdev)
         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)
+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;
-        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;
+        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)
+static ssize_t part_size_show(struct device *dev,
+                              struct device_attribute *attr, char *buf)
 {
-        kobject_uevent(&p->kobj, KOBJ_ADD);
-        return count;
+        struct hd_struct *p = dev_to_part(dev);
+        return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
 }
-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)
+
+static ssize_t part_stat_show(struct device *dev,
+                              struct device_attribute *attr, char *buf)
 {
-        return sprintf(page, "%8u %8llu %8u %8llu\n",
+        struct hd_struct *p = dev_to_part(dev);
+
+        return sprintf(buf, "%8u %8llu %8u %8llu\n",
                        p->ios[0], (unsigned long long)p->sectors[0],
                        p->ios[1], (unsigned long long)p->sectors[1]);
 }
-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
-};
 
 #ifdef CONFIG_FAIL_MAKE_REQUEST
+static ssize_t part_fail_show(struct device *dev,
+                              struct device_attribute *attr, char *buf)
+{
+        struct hd_struct *p = dev_to_part(dev);
 
-static ssize_t part_fail_store(struct hd_struct * p,
+        return sprintf(buf, "%d\n", p->make_it_fail);
+}
+
+static 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)
@@ -292,49 +241,52 @@ static ssize_t part_fail_store(struct hd_struct * p,
 
         return count;
 }
-static ssize_t part_fail_read(struct hd_struct * p, char *page)
-{
-        return sprintf(page, "%d\n", p->make_it_fail);
-}
-static struct part_attribute part_attr_fail = {
-        .attr = {.name = "make-it-fail", .mode = S_IRUGO | S_IWUSR },
-        .store  = part_fail_store,
-        .show   = part_fail_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 * default_attrs[] = {
-        &part_attr_uevent.attr,
-        &part_attr_dev.attr,
-        &part_attr_start.attr,
-        &part_attr_size.attr,
-        &part_attr_stat.attr,
+static struct attribute *part_attrs[] = {
+        &dev_attr_start.attr,
+        &dev_attr_size.attr,
+        &dev_attr_stat.attr,
 #ifdef CONFIG_FAIL_MAKE_REQUEST
-        &part_attr_fail.attr,
+        &dev_attr_fail.attr,
 #endif
-        NULL,
+        NULL
 };
 
-extern struct kset *block_kset;
+static struct attribute_group part_attr_group = {
+        .attrs = part_attrs,
+};
 
-static void part_release(struct kobject *kobj)
+static struct attribute_group *part_attr_groups[] = {
+        &part_attr_group,
+        NULL
+};
+
+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);
         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,
 };
 
 static inline void partition_sysfs_add_subdir(struct hd_struct *p)
 {
         struct kobject *k;
 
-        k = kobject_get(&p->kobj);
+        k = kobject_get(&p->dev.kobj);
         p->holder_dir = kobject_create_and_add("holders", k);
         kobject_put(k);
 }
@@ -343,7 +295,7 @@ static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
 {
         struct kobject *k;
 
-        k = kobject_get(&disk->kobj);
+        k = kobject_get(&disk->dev.kobj);
         disk->holder_dir = kobject_create_and_add("holders", k);
         disk->slave_dir = kobject_create_and_add("slaves", k);
         kobject_put(k);
@@ -352,6 +304,7 @@ static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
 void delete_partition(struct gendisk *disk, int part)
 {
         struct hd_struct *p = disk->part[part-1];
+
         if (!p)
                 return;
         if (!p->nr_sects)
@@ -361,113 +314,55 @@ void delete_partition(struct gendisk *disk, int part)
         p->nr_sects = 0;
         p->ios[0] = p->ios[1] = 0;
         p->sectors[0] = p->sectors[1] = 0;
-        sysfs_remove_link(&p->kobj, "subsystem");
         kobject_unregister(p->holder_dir);
-        kobject_uevent(&p->kobj, KOBJ_REMOVE);
-        kobject_del(&p->kobj);
-        kobject_put(&p->kobj);
+        device_del(&p->dev);
+        put_device(&p->dev);
 }
 
 void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len, int flags)
 {
         struct hd_struct *p;
+        int err;
 
         p = kzalloc(sizeof(*p), GFP_KERNEL);
         if (!p)
                 return;
-        
+
         p->start_sect = start;
         p->nr_sects = len;
         p->partno = part;
         p->policy = disk->policy;
 
-        if (isdigit(disk->kobj.k_name[strlen(disk->kobj.k_name)-1]))
-                kobject_set_name(&p->kobj, "%sp%d",
-                                 kobject_name(&disk->kobj), part);
+        if (isdigit(disk->dev.bus_id[strlen(disk->dev.bus_id)-1]))
+                snprintf(p->dev.bus_id, BUS_ID_SIZE,
+                "%sp%d", disk->dev.bus_id, part);
         else
-                kobject_set_name(&p->kobj, "%s%d",
-                                 kobject_name(&disk->kobj),part);
-        p->kobj.parent = &disk->kobj;
-        p->kobj.ktype = &ktype_part;
-        kobject_init(&p->kobj);
-        kobject_add(&p->kobj);
-        if (!disk->part_uevent_suppress)
-                kobject_uevent(&p->kobj, KOBJ_ADD);
-        sysfs_create_link(&p->kobj, &block_kset->kobj, "subsystem");
+                snprintf(p->dev.bus_id, BUS_ID_SIZE,
+                         "%s%d", disk->dev.bus_id, part);
+
+        device_initialize(&p->dev);
+        p->dev.devt = MKDEV(disk->major, disk->first_minor + part);
+        p->dev.class = &block_class;
+        p->dev.type = &part_type;
+        p->dev.parent = &disk->dev;
+        disk->part[part-1] = p;
+
+        /* delay uevent until 'holders' subdir is created */
+        p->dev.uevent_suppress = 1;
+        device_add(&p->dev);
+        partition_sysfs_add_subdir(p);
+        p->dev.uevent_suppress = 0;
         if (flags & ADDPART_FLAG_WHOLEDISK) {
                 static struct attribute addpartattr = {
                         .name = "whole_disk",
                         .mode = S_IRUSR | S_IRGRP | S_IROTH,
                 };
-
-                sysfs_create_file(&p->kobj, &addpartattr);
+                err = sysfs_create_file(&p->dev.kobj, &addpartattr);
         }
-        partition_sysfs_add_subdir(p);
-        disk->part[part-1] = p;
-}
 
-static char *make_block_name(struct gendisk *disk)
-{
-        char *name;
-        static char *block_str = "block:";
-        int size;
-        char *s;
-
-        size = strlen(block_str) + strlen(disk->disk_name) + 1;
-        name = kmalloc(size, GFP_KERNEL);
-        if (!name)
-                return NULL;
-        strcpy(name, block_str);
-        strcat(name, disk->disk_name);
-        /* ewww... some of these buggers have / in name... */
-        s = strchr(name, '/');
-        if (s)
-                *s = '!';
-        return name;
-}
-
-static int disk_sysfs_symlinks(struct gendisk *disk)
-{
-        struct device *target = get_device(disk->driverfs_dev);
-        int err;
-        char *disk_name = NULL;
-
-        if (target) {
-                disk_name = make_block_name(disk);
-                if (!disk_name) {
-                        err = -ENOMEM;
-                        goto err_out;
-                }
-
-                err = sysfs_create_link(&disk->kobj, &target->kobj, "device");
-                if (err)
-                        goto err_out_disk_name;
-
-                err = sysfs_create_link(&target->kobj, &disk->kobj, disk_name);
-                if (err)
-                        goto err_out_dev_link;
-        }
-
-        err = sysfs_create_link(&disk->kobj, &block_kset->kobj,
-                                "subsystem");
-        if (err)
-                goto err_out_disk_name_lnk;
-
-        kfree(disk_name);
-
-        return 0;
-
-err_out_disk_name_lnk:
-        if (target) {
-                sysfs_remove_link(&target->kobj, disk_name);
-err_out_dev_link:
-                sysfs_remove_link(&disk->kobj, "device");
-err_out_disk_name:
-                kfree(disk_name);
-err_out:
-                put_device(target);
-        }
-        return err;
+        /* suppress uevent if the disk supresses it */
+        if (!disk->dev.uevent_suppress)
+                kobject_uevent(&p->dev.kobj, KOBJ_ADD);
 }
 
 /* Not exported, helper to add_disk(). */
@@ -479,19 +374,29 @@ void register_disk(struct gendisk *disk)
         struct hd_struct *p;
         int err;
 
-        kobject_set_name(&disk->kobj, "%s", disk->disk_name);
-        /* ewww... some of these buggers have / in name... */
-        s = strchr(disk->kobj.k_name, '/');
+        disk->dev.parent = disk->driverfs_dev;
+        disk->dev.devt = MKDEV(disk->major, disk->first_minor);
+
+        strlcpy(disk->dev.bus_id, disk->disk_name, KOBJ_NAME_LEN);
+        /* ewww... some of these buggers have / in the name... */
+        s = strchr(disk->dev.bus_id, '/');
         if (s)
                 *s = '!';
-        if ((err = kobject_add(&disk->kobj)))
+
+        /* delay uevents, until we scanned partition table */
+        disk->dev.uevent_suppress = 1;
+
+        if (device_add(&disk->dev))
                 return;
-        err = disk_sysfs_symlinks(disk);
+#ifndef CONFIG_SYSFS_DEPRECATED
+        err = sysfs_create_link(block_depr, &disk->dev.kobj,
+                                kobject_name(&disk->dev.kobj));
         if (err) {
-                kobject_del(&disk->kobj);
+                device_del(&disk->dev);
                 return;
         }
-        disk_sysfs_add_subdirs(disk);
+#endif
+        disk_sysfs_add_subdirs(disk);
 
         /* No minors to use for partitions */
         if (disk->minors == 1)
@@ -505,25 +410,23 @@ void register_disk(struct gendisk *disk)
         if (!bdev)
                 goto exit;
 
-        /* scan partition table, but suppress uevents */
         bdev->bd_invalidated = 1;
-        disk->part_uevent_suppress = 1;
         err = blkdev_get(bdev, FMODE_READ, 0);
-        disk->part_uevent_suppress = 0;
         if (err < 0)
                 goto exit;
         blkdev_put(bdev);
 
 exit:
-        /* announce disk after possible partitions are already created */
-        kobject_uevent(&disk->kobj, KOBJ_ADD);
+        /* announce disk after possible partitions are created */
+        disk->dev.uevent_suppress = 0;
+        kobject_uevent(&disk->dev.kobj, KOBJ_ADD);
 
         /* announce possible partitions */
         for (i = 1; i < disk->minors; i++) {
                 p = disk->part[i-1];
                 if (!p || !p->nr_sects)
                         continue;
-                kobject_uevent(&p->kobj, KOBJ_ADD);
+                kobject_uevent(&p->dev.kobj, KOBJ_ADD);
         }
 }
 
@@ -602,19 +505,11 @@ void del_gendisk(struct gendisk *disk)
         disk_stat_set_all(disk, 0);
         disk->stamp = 0;
 
-        kobject_uevent(&disk->kobj, KOBJ_REMOVE);
         kobject_unregister(disk->holder_dir);
         kobject_unregister(disk->slave_dir);
-        if (disk->driverfs_dev) {
-                char *disk_name = make_block_name(disk);
-                sysfs_remove_link(&disk->kobj, "device");
-                if (disk_name) {
-                        sysfs_remove_link(&disk->driverfs_dev->kobj, disk_name);
-                        kfree(disk_name);
-                }
-                put_device(disk->driverfs_dev);
-                disk->driverfs_dev = NULL;
-        }
-        sysfs_remove_link(&disk->kobj, "subsystem");
-        kobject_del(&disk->kobj);
+        disk->driverfs_dev = NULL;
+#ifndef CONFIG_SYSFS_DEPRECATED
+        sysfs_remove_link(block_depr, disk->dev.bus_id);
+#endif
+        device_del(&disk->dev);
 }