[PATCH] dm/md dependency tree in sysfs: bd_claim_by_kobject

Adding bd_claim_by_kobject() function which takes kobject as additional
signature of holder device and creates sysfs symlinks between holder device
and claimed device.  bd_release_from_kobject() is a counterpart of
bd_claim_by_kobject.

Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 5983d42..3f36df7 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -266,6 +266,9 @@ static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
                mutex_init(&bdev->bd_mount_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);
        }
 }
@@ -490,6 +493,300 @@ 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 struct kobject *bdev_get_kobj(struct block_device *bdev)
+{
+       if (bdev->bd_contains != bdev)
+               return kobject_get(&bdev->bd_part->kobj);
+       else
+               return kobject_get(&bdev->bd_disk->kobj);
+}
+
+static struct kobject *bdev_get_holder(struct block_device *bdev)
+{
+       if (bdev->bd_contains != bdev)
+               return kobject_get(bdev->bd_part->holder_dir);
+       else
+               return kobject_get(bdev->bd_disk->holder_dir);
+}
+
+static void add_symlink(struct kobject *from, struct kobject *to)
+{
+       if (!from || !to)
+               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 = bdev_get_kobj(bdev);
+       if (!bo->sdev)
+               goto fail_put_hdev;
+
+       bo->hdir = bdev_get_holder(bdev);
+       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);
+}
+
+/**
+ * add_bd_holder - create sysfs symlinks for bd_claim() relationship
+ *
+ * @bdev:      block device to be bd_claimed
+ * @bo:                preallocated and initialized by alloc_bd_holder()
+ *
+ * If there is no matching entry with @bo in @bdev->bd_holder_list,
+ * add @bo to the list, create symlinks.
+ *
+ * Returns 1 if @bo was added to the list.
+ * Returns 0 if @bo wasn't used by any reason and should be freed.
+ */
+static int add_bd_holder(struct block_device *bdev, struct bd_holder *bo)
+{
+       struct bd_holder *tmp;
+
+       if (!bo)
+               return 0;
+
+       list_for_each_entry(tmp, &bdev->bd_holder_list, list) {
+               if (tmp->sdir == bo->sdir) {
+                       tmp->count++;
+                       return 0;
+               }
+       }
+
+       if (!bd_holder_grab_dirs(bdev, bo))
+               return 0;
+
+       add_symlink(bo->sdir, bo->sdev);
+       add_symlink(bo->hdir, bo->hdev);
+       list_add_tail(&bo->list, &bdev->bd_holder_list);
+       return 1;
+}
+
+/**
+ * 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
+ *
+ * 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.
+ *
+ * Returns 0 on success. (same as bd_claim())
+ * Returns errno on failure.
+ */
+static int bd_claim_by_kobject(struct block_device *bdev, void *holder,
+                               struct kobject *kobj)
+{
+       int res;
+       struct bd_holder *bo;
+
+       if (!kobj)
+               return -EINVAL;
+
+       bo = alloc_bd_holder(kobj);
+       if (!bo)
+               return -ENOMEM;
+
+       down(&bdev->bd_sem);
+       res = bd_claim(bdev, holder);
+       if (res || !add_bd_holder(bdev, bo))
+               free_bd_holder(bo);
+       up(&bdev->bd_sem);
+
+       return res;
+}
+
+/**
+ * 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)
+{
+       struct bd_holder *bo;
+
+       if (!kobj)
+               return;
+
+       down(&bdev->bd_sem);
+       bd_release(bdev);
+       if ((bo = del_bd_holder(bdev, kobj)))
+               free_bd_holder(bo);
+       up(&bdev->bd_sem);
+}
+
+/**
+ * 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)
+{
+       return bd_claim_by_kobject(bdev, holder, kobject_get(disk->slave_dir));
+}
+EXPORT_SYMBOL_GPL(bd_claim_by_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);
+}
+EXPORT_SYMBOL_GPL(bd_release_from_disk);
+#endif
+
 /*
  * Tries to open block device by device number.  Use it ONLY if you
  * really do not have anything better - i.e. when you are behind a

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 9d96749..680d913 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -410,6 +410,9 @@ struct block_device {
        struct list_head        bd_inodes;
        void *                  bd_holder;
        int                     bd_holders;
+#ifdef CONFIG_SYSFS
+       struct list_head        bd_holder_list;
+#endif
        struct block_device *   bd_contains;
        unsigned                bd_block_size;
        struct hd_struct *      bd_part;
@@ -1399,6 +1402,13 @@ extern int blkdev_get(struct block_device *, mode_t, unsigned);
 extern int blkdev_put(struct block_device *);
 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 *);
+#else
+#define bd_claim_by_disk(bdev, holder, disk)   bd_claim(bdev, holder)
+#define bd_release_from_disk(bdev, disk)       bd_release(bdev)
+#endif
 
 /* fs/char_dev.c */
 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);