summaryrefslogtreecommitdiff
path: root/block
diff options
context:
space:
mode:
Diffstat (limited to 'block')
-rw-r--r--block/bdev.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/block/bdev.c b/block/bdev.c
index f3b13aa1b7d4..bdc7d739882b 100644
--- a/block/bdev.c
+++ b/block/bdev.c
@@ -829,6 +829,25 @@ put_blkdev:
}
EXPORT_SYMBOL(blkdev_get_by_dev);
+struct bdev_handle *bdev_open_by_dev(dev_t dev, blk_mode_t mode, void *holder,
+ const struct blk_holder_ops *hops)
+{
+ struct bdev_handle *handle = kmalloc(sizeof(*handle), GFP_KERNEL);
+ struct block_device *bdev;
+
+ if (!handle)
+ return ERR_PTR(-ENOMEM);
+ bdev = blkdev_get_by_dev(dev, mode, holder, hops);
+ if (IS_ERR(bdev)) {
+ kfree(handle);
+ return ERR_CAST(bdev);
+ }
+ handle->bdev = bdev;
+ handle->holder = holder;
+ return handle;
+}
+EXPORT_SYMBOL(bdev_open_by_dev);
+
/**
* blkdev_get_by_path - open a block device by name
* @path: path to the block device to open
@@ -867,6 +886,28 @@ struct block_device *blkdev_get_by_path(const char *path, blk_mode_t mode,
}
EXPORT_SYMBOL(blkdev_get_by_path);
+struct bdev_handle *bdev_open_by_path(const char *path, blk_mode_t mode,
+ void *holder, const struct blk_holder_ops *hops)
+{
+ struct bdev_handle *handle;
+ dev_t dev;
+ int error;
+
+ error = lookup_bdev(path, &dev);
+ if (error)
+ return ERR_PTR(error);
+
+ handle = bdev_open_by_dev(dev, mode, holder, hops);
+ if (!IS_ERR(handle) && (mode & BLK_OPEN_WRITE) &&
+ bdev_read_only(handle->bdev)) {
+ bdev_release(handle);
+ return ERR_PTR(-EACCES);
+ }
+
+ return handle;
+}
+EXPORT_SYMBOL(bdev_open_by_path);
+
void blkdev_put(struct block_device *bdev, void *holder)
{
struct gendisk *disk = bdev->bd_disk;
@@ -903,6 +944,13 @@ void blkdev_put(struct block_device *bdev, void *holder)
}
EXPORT_SYMBOL(blkdev_put);
+void bdev_release(struct bdev_handle *handle)
+{
+ blkdev_put(handle->bdev, handle->holder);
+ kfree(handle);
+}
+EXPORT_SYMBOL(bdev_release);
+
/**
* lookup_bdev() - Look up a struct block_device by name.
* @pathname: Name of the block device in the filesystem.