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-rw-r--r--fs/block_dev.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 4eeb69a8873..b721955d382 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -853,6 +853,34 @@ struct block_device *open_by_devnum(dev_t dev, unsigned mode)
EXPORT_SYMBOL(open_by_devnum);
/**
+ * check_disk_size_change - checks for disk size change and adjusts
+ * bdev size.
+ *
+ * @disk: struct gendisk to check
+ * @bdev: struct bdev to adjust.
+ *
+ * This routine checks to see if the bdev size does not match the disk size
+ * and adjusts it if it differs.
+ */
+void check_disk_size_change(struct gendisk *disk, struct block_device *bdev)
+{
+ loff_t disk_size, bdev_size;
+
+ disk_size = (loff_t)get_capacity(disk) << 9;
+ bdev_size = i_size_read(bdev->bd_inode);
+ if (disk_size != bdev_size) {
+ char name[BDEVNAME_SIZE];
+
+ disk_name(disk, 0, name);
+ printk(KERN_INFO
+ "%s: detected capacity change from %lld to %lld\n",
+ name, bdev_size, disk_size);
+ i_size_write(bdev->bd_inode, disk_size);
+ }
+}
+EXPORT_SYMBOL(check_disk_size_change);
+
+/**
* revalidate_disk - wrapper for lower-level driver's revalidate_disk
* call-back
*
@@ -864,11 +892,20 @@ EXPORT_SYMBOL(open_by_devnum);
*/
int revalidate_disk(struct gendisk *disk)
{
+ struct block_device *bdev;
int ret = 0;
if (disk->fops->revalidate_disk)
ret = disk->fops->revalidate_disk(disk);
+ bdev = bdget_disk(disk, 0);
+ if (!bdev)
+ return ret;
+
+ mutex_lock(&bdev->bd_mutex);
+ check_disk_size_change(disk, bdev);
+ mutex_unlock(&bdev->bd_mutex);
+ bdput(bdev);
return ret;
}
EXPORT_SYMBOL(revalidate_disk);