4 files changed, 74 insertions, 291 deletions

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 90267f8d64ee..2c876ffc63df 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -328,12 +328,22 @@ static int open_dev(struct dm_dev_internal *d, dev_t dev,
         bdev = open_by_devnum(dev, d->dm_dev.mode);
         if (IS_ERR(bdev))
                 return PTR_ERR(bdev);
-        r = bd_claim_by_disk(bdev, _claim_ptr, dm_disk(md));
-        if (r)
+
+        r = bd_claim(bdev, _claim_ptr);
+        if (r) {
                 blkdev_put(bdev, d->dm_dev.mode);
-        else
-                d->dm_dev.bdev = bdev;
-        return r;
+                return r;
+        }
+
+        r = bd_link_disk_holder(bdev, dm_disk(md));
+        if (r) {
+                bd_release(bdev);
+                blkdev_put(bdev, d->dm_dev.mode);
+                return r;
+        }
+
+        d->dm_dev.bdev = bdev;
+        return 0;
 }
 
 /*
@@ -344,7 +354,8 @@ static void close_dev(struct dm_dev_internal *d, struct mapped_device *md)
         if (!d->dm_dev.bdev)
                 return;
 
-        bd_release_from_disk(d->dm_dev.bdev, dm_disk(md));
+        bd_unlink_disk_holder(d->dm_dev.bdev);
+        bd_release(d->dm_dev.bdev);
         blkdev_put(d->dm_dev.bdev, d->dm_dev.mode);
         d->dm_dev.bdev = NULL;
 }
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 4e957f3140a8..c47644fca1a1 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1880,7 +1880,7 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
         rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
 
         list_add_rcu(&rdev->same_set, &mddev->disks);
-        bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
+        bd_link_disk_holder(rdev->bdev, mddev->gendisk);
 
         /* May as well allow recovery to be retried once */
         mddev->recovery_disabled = 0;
@@ -1907,7 +1907,7 @@ static void unbind_rdev_from_array(mdk_rdev_t * rdev)
                 MD_BUG();
                 return;
         }
-        bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
+        bd_unlink_disk_holder(rdev->bdev);
         list_del_rcu(&rdev->same_set);
         printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
         rdev->mddev = NULL;
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 06e8ff12b97c..9329068684d2 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -426,9 +426,6 @@ static void init_once(void *foo)
         mutex_init(&bdev->bd_mutex);
         INIT_LIST_HEAD(&bdev->bd_inodes);
         INIT_LIST_HEAD(&bdev->bd_list);
-#ifdef CONFIG_SYSFS
-        INIT_LIST_HEAD(&bdev->bd_holder_list);
-#endif
         inode_init_once(&ei->vfs_inode);
         /* Initialize mutex for freeze. */
         mutex_init(&bdev->bd_fsfreeze_mutex);
@@ -881,314 +878,83 @@ void bd_release(struct block_device *bdev)
 EXPORT_SYMBOL(bd_release);
 
 #ifdef CONFIG_SYSFS
-/*
- * Functions for bd_claim_by_kobject / bd_release_from_kobject
- *
- *     If a kobject is passed to bd_claim_by_kobject()
- *     and the kobject has a parent directory,
- *     following symlinks are created:
- *        o from the kobject to the claimed bdev
- *        o from "holders" directory of the bdev to the parent of the kobject
- *     bd_release_from_kobject() removes these symlinks.
- *
- *     Example:
- *        If /dev/dm-0 maps to /dev/sda, kobject corresponding to
- *        /sys/block/dm-0/slaves is passed to bd_claim_by_kobject(), then:
- *           /sys/block/dm-0/slaves/sda --> /sys/block/sda
- *           /sys/block/sda/holders/dm-0 --> /sys/block/dm-0
- */
-
 static int add_symlink(struct kobject *from, struct kobject *to)
 {
-        if (!from || !to)
-                return 0;
         return sysfs_create_link(from, to, kobject_name(to));
 }
 
 static void del_symlink(struct kobject *from, struct kobject *to)
 {
-        if (!from || !to)
-                return;
         sysfs_remove_link(from, kobject_name(to));
 }
 
-/*
- * 'struct bd_holder' contains pointers to kobjects symlinked by
- * bd_claim_by_kobject.
- * It's connected to bd_holder_list which is protected by bdev->bd_sem.
- */
-struct bd_holder {
-        struct list_head list;  /* chain of holders of the bdev */
-        int count;              /* references from the holder */
-        struct kobject *sdir;   /* holder object, e.g. "/block/dm-0/slaves" */
-        struct kobject *hdev;   /* e.g. "/block/dm-0" */
-        struct kobject *hdir;   /* e.g. "/block/sda/holders" */
-        struct kobject *sdev;   /* e.g. "/block/sda" */
-};
-
-/*
- * Get references of related kobjects at once.
- * Returns 1 on success. 0 on failure.
- *
- * Should call bd_holder_release_dirs() after successful use.
- */
-static int bd_holder_grab_dirs(struct block_device *bdev,
-                        struct bd_holder *bo)
-{
-        if (!bdev || !bo)
-                return 0;
-
-        bo->sdir = kobject_get(bo->sdir);
-        if (!bo->sdir)
-                return 0;
-
-        bo->hdev = kobject_get(bo->sdir->parent);
-        if (!bo->hdev)
-                goto fail_put_sdir;
-
-        bo->sdev = kobject_get(&part_to_dev(bdev->bd_part)->kobj);
-        if (!bo->sdev)
-                goto fail_put_hdev;
-
-        bo->hdir = kobject_get(bdev->bd_part->holder_dir);
-        if (!bo->hdir)
-                goto fail_put_sdev;
-
-        return 1;
-
-fail_put_sdev:
-        kobject_put(bo->sdev);
-fail_put_hdev:
-        kobject_put(bo->hdev);
-fail_put_sdir:
-        kobject_put(bo->sdir);
-
-        return 0;
-}
-
-/* Put references of related kobjects at once. */
-static void bd_holder_release_dirs(struct bd_holder *bo)
-{
-        kobject_put(bo->hdir);
-        kobject_put(bo->sdev);
-        kobject_put(bo->hdev);
-        kobject_put(bo->sdir);
-}
-
-static struct bd_holder *alloc_bd_holder(struct kobject *kobj)
-{
-        struct bd_holder *bo;
-
-        bo = kzalloc(sizeof(*bo), GFP_KERNEL);
-        if (!bo)
-                return NULL;
-
-        bo->count = 1;
-        bo->sdir = kobj;
-
-        return bo;
-}
-
-static void free_bd_holder(struct bd_holder *bo)
-{
-        kfree(bo);
-}
-
 /**
- * find_bd_holder - find matching struct bd_holder from the block device
+ * bd_link_disk_holder - create symlinks between holding disk and slave bdev
+ * @bdev: the claimed slave bdev
+ * @disk: the holding disk
  *
- * @bdev:       struct block device to be searched
- * @bo:         target struct bd_holder
+ * This functions creates the following sysfs symlinks.
  *
- * Returns matching entry with @bo in @bdev->bd_holder_list.
- * If found, increment the reference count and return the pointer.
- * If not found, returns NULL.
- */
-static struct bd_holder *find_bd_holder(struct block_device *bdev,
-                                        struct bd_holder *bo)
-{
-        struct bd_holder *tmp;
-
-        list_for_each_entry(tmp, &bdev->bd_holder_list, list)
-                if (tmp->sdir == bo->sdir) {
-                        tmp->count++;
-                        return tmp;
-                }
-
-        return NULL;
-}
-
-/**
- * add_bd_holder - create sysfs symlinks for bd_claim() relationship
+ * - from "slaves" directory of the holder @disk to the claimed @bdev
+ * - from "holders" directory of the @bdev to the holder @disk
  *
- * @bdev:       block device to be bd_claimed
- * @bo:         preallocated and initialized by alloc_bd_holder()
+ * For example, if /dev/dm-0 maps to /dev/sda and disk for dm-0 is
+ * passed to bd_link_disk_holder(), then:
  *
- * Add @bo to @bdev->bd_holder_list, create symlinks.
+ *   /sys/block/dm-0/slaves/sda --> /sys/block/sda
+ *   /sys/block/sda/holders/dm-0 --> /sys/block/dm-0
  *
- * Returns 0 if symlinks are created.
- * Returns -ve if something fails.
- */
-static int add_bd_holder(struct block_device *bdev, struct bd_holder *bo)
-{
-        int err;
-
-        if (!bo)
-                return -EINVAL;
-
-        if (!bd_holder_grab_dirs(bdev, bo))
-                return -EBUSY;
-
-        err = add_symlink(bo->sdir, bo->sdev);
-        if (err)
-                return err;
-
-        err = add_symlink(bo->hdir, bo->hdev);
-        if (err) {
-                del_symlink(bo->sdir, bo->sdev);
-                return err;
-        }
-
-        list_add_tail(&bo->list, &bdev->bd_holder_list);
-        return 0;
-}
-
-/**
- * del_bd_holder - delete sysfs symlinks for bd_claim() relationship
- *
- * @bdev:       block device to be bd_claimed
- * @kobj:       holder's kobject
- *
- * If there is matching entry with @kobj in @bdev->bd_holder_list
- * and no other bd_claim() from the same kobject,
- * remove the struct bd_holder from the list, delete symlinks for it.
- *
- * Returns a pointer to the struct bd_holder when it's removed from the list
- * and ready to be freed.
- * Returns NULL if matching claim isn't found or there is other bd_claim()
- * by the same kobject.
- */
-static struct bd_holder *del_bd_holder(struct block_device *bdev,
-                                        struct kobject *kobj)
-{
-        struct bd_holder *bo;
-
-        list_for_each_entry(bo, &bdev->bd_holder_list, list) {
-                if (bo->sdir == kobj) {
-                        bo->count--;
-                        BUG_ON(bo->count < 0);
-                        if (!bo->count) {
-                                list_del(&bo->list);
-                                del_symlink(bo->sdir, bo->sdev);
-                                del_symlink(bo->hdir, bo->hdev);
-                                bd_holder_release_dirs(bo);
-                                return bo;
-                        }
-                        break;
-                }
-        }
-
-        return NULL;
-}
-
-/**
- * bd_claim_by_kobject - bd_claim() with additional kobject signature
- *
- * @bdev:       block device to be claimed
- * @holder:     holder's signature
- * @kobj:       holder's kobject
+ * The caller must have claimed @bdev before calling this function and
+ * ensure that both @bdev and @disk are valid during the creation and
+ * lifetime of these symlinks.
  *
- * Do bd_claim() and if it succeeds, create sysfs symlinks between
- * the bdev and the holder's kobject.
- * Use bd_release_from_kobject() when relesing the claimed bdev.
+ * CONTEXT:
+ * Might sleep.
  *
- * Returns 0 on success. (same as bd_claim())
- * Returns errno on failure.
+ * RETURNS:
+ * 0 on success, -errno on failure.
  */
-static int bd_claim_by_kobject(struct block_device *bdev, void *holder,
-                                struct kobject *kobj)
+int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk)
 {
-        int err;
-        struct bd_holder *bo, *found;
-
-        if (!kobj)
-                return -EINVAL;
-
-        bo = alloc_bd_holder(kobj);
-        if (!bo)
-                return -ENOMEM;
+        int ret = 0;
 
         mutex_lock(&bdev->bd_mutex);
 
-        err = bd_claim(bdev, holder);
-        if (err)
-                goto fail;
+        WARN_ON_ONCE(!bdev->bd_holder || bdev->bd_holder_disk);
 
-        found = find_bd_holder(bdev, bo);
-        if (found)
-                goto fail;
+        /* FIXME: remove the following once add_disk() handles errors */
+        if (WARN_ON(!disk->slave_dir || !bdev->bd_part->holder_dir))
+                goto out_unlock;
 
-        err = add_bd_holder(bdev, bo);
-        if (err)
-                bd_release(bdev);
-        else
-                bo = NULL;
-fail:
-        mutex_unlock(&bdev->bd_mutex);
-        free_bd_holder(bo);
-        return err;
-}
+        ret = add_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj);
+        if (ret)
+                goto out_unlock;
 
-/**
- * bd_release_from_kobject - bd_release() with additional kobject signature
- *
- * @bdev:       block device to be released
- * @kobj:       holder's kobject
- *
- * Do bd_release() and remove sysfs symlinks created by bd_claim_by_kobject().
- */
-static void bd_release_from_kobject(struct block_device *bdev,
-                                        struct kobject *kobj)
-{
-        if (!kobj)
-                return;
+        ret = add_symlink(bdev->bd_part->holder_dir, &disk_to_dev(disk)->kobj);
+        if (ret) {
+                del_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj);
+                goto out_unlock;
+        }
 
-        mutex_lock(&bdev->bd_mutex);
-        bd_release(bdev);
-        free_bd_holder(del_bd_holder(bdev, kobj));
+        bdev->bd_holder_disk = disk;
+out_unlock:
         mutex_unlock(&bdev->bd_mutex);
+        return ret;
 }
+EXPORT_SYMBOL_GPL(bd_link_disk_holder);
 
-/**
- * bd_claim_by_disk - wrapper function for bd_claim_by_kobject()
- *
- * @bdev:       block device to be claimed
- * @holder:     holder's signature
- * @disk:       holder's gendisk
- *
- * Call bd_claim_by_kobject() with getting @disk->slave_dir.
- */
-int bd_claim_by_disk(struct block_device *bdev, void *holder,
-                        struct gendisk *disk)
+void bd_unlink_disk_holder(struct block_device *bdev)
 {
-        return bd_claim_by_kobject(bdev, holder, kobject_get(disk->slave_dir));
-}
-EXPORT_SYMBOL_GPL(bd_claim_by_disk);
+        struct gendisk *disk = bdev->bd_holder_disk;
 
-/**
- * bd_release_from_disk - wrapper function for bd_release_from_kobject()
- *
- * @bdev:       block device to be claimed
- * @disk:       holder's gendisk
- *
- * Call bd_release_from_kobject() and put @disk->slave_dir.
- */
-void bd_release_from_disk(struct block_device *bdev, struct gendisk *disk)
-{
-        bd_release_from_kobject(bdev, disk->slave_dir);
-        kobject_put(disk->slave_dir);
+        bdev->bd_holder_disk = NULL;
+        if (!disk)
+                return;
+
+        del_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj);
+        del_symlink(bdev->bd_part->holder_dir, &disk_to_dev(disk)->kobj);
 }
-EXPORT_SYMBOL_GPL(bd_release_from_disk);
+EXPORT_SYMBOL_GPL(bd_unlink_disk_holder);
 #endif
 
 /*
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 334d68a17108..66b7f2c5d7e9 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -663,7 +663,7 @@ struct block_device {
         void *                  bd_holder;
         int                     bd_holders;
 #ifdef CONFIG_SYSFS
-        struct list_head        bd_holder_list;
+        struct gendisk *        bd_holder_disk; /* for sysfs slave linkng */
 #endif
         struct block_device *   bd_contains;
         unsigned                bd_block_size;
@@ -2042,11 +2042,17 @@ extern int blkdev_put(struct block_device *, fmode_t);
 extern int bd_claim(struct block_device *, void *);
 extern void bd_release(struct block_device *);
 #ifdef CONFIG_SYSFS
-extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
-extern void bd_release_from_disk(struct block_device *, struct gendisk *);
+extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
+extern void bd_unlink_disk_holder(struct block_device *bdev);
 #else
-#define bd_claim_by_disk(bdev, holder, disk)    bd_claim(bdev, holder)
-#define bd_release_from_disk(bdev, disk)        bd_release(bdev)
+static inline int bd_link_disk_holder(struct block_device *bdev,
+                                      struct gendisk *disk)
+{
+        return 0;
+}
+static inline void bd_unlink_disk_holder(struct block_device *bdev)
+{
+}
 #endif
 #endif