mm: FOLL_DUMP replace FOLL_ANON

[sfrench/cifs-2.6.git] / fs / block_dev.c

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 94dfda24c06e5ea08b7df4883b640db573d137e7..5d1ed50bd46c591c1ef63b312c4844d013f5239b 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -420,7 +420,6 @@ static void bdev_destroy_inode(struct inode *inode)
 {
        struct bdev_inode *bdi = BDEV_I(inode);
 
-       bdi->bdev.bd_inode_backing_dev_info = NULL;
        kmem_cache_free(bdev_cachep, bdi);
 }
 
@@ -1115,7 +1114,7 @@ EXPORT_SYMBOL(revalidate_disk);
 int check_disk_change(struct block_device *bdev)
 {
        struct gendisk *disk = bdev->bd_disk;
-       struct block_device_operations * bdops = disk->fops;
+       const struct block_device_operations *bdops = disk->fops;
 
        if (!bdops->media_changed)
                return 0;
@@ -1404,6 +1403,33 @@ static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg)
        return blkdev_ioctl(bdev, mode, cmd, arg);
 }
 
+/*
+ * Write data to the block device.  Only intended for the block device itself
+ * and the raw driver which basically is a fake block device.
+ *
+ * Does not take i_mutex for the write and thus is not for general purpose
+ * use.
+ */
+ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
+                        unsigned long nr_segs, loff_t pos)
+{
+       struct file *file = iocb->ki_filp;
+       ssize_t ret;
+
+       BUG_ON(iocb->ki_pos != pos);
+
+       ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
+       if (ret > 0 || ret == -EIOCBQUEUED) {
+               ssize_t err;
+
+               err = generic_write_sync(file, pos, ret);
+               if (err < 0 && ret > 0)
+                       ret = err;
+       }
+       return ret;
+}
+EXPORT_SYMBOL_GPL(blkdev_aio_write);
+
 /*
  * Try to release a page associated with block device when the system
  * is under memory pressure.
@@ -1436,7 +1462,7 @@ const struct file_operations def_blk_fops = {
        .read           = do_sync_read,
        .write          = do_sync_write,
        .aio_read       = generic_file_aio_read,
-       .aio_write      = generic_file_aio_write_nolock,
+       .aio_write      = blkdev_aio_write,
        .mmap           = generic_file_mmap,
        .fsync          = block_fsync,
        .unlocked_ioctl = block_ioctl,