[Patch 1/5] dm: fix block device resizing

Joe Thornber
2003-11-25T16:31:03Z

When setting the size of a Device-Mapper device in the gendisk entry,
also try to set the size of the corresponding block_device entry's
inode. This is necessary to allow online device/filesystem resizing to
work correctly. [Kevin Corry]
--- diff/drivers/md/dm.c 2003-09-30 15:46:14.000000000 +0100
+++ source/drivers/md/dm.c 2003-11-25 15:36:59.000000000 +0000
@@ -666,6 +666,20 @@
up_write(&md->lock);
}

+static void __set_size(struct gendisk *disk, sector_t size)
+{
+ struct block_device *bdev;
+
+ set_capacity(disk, size);
+ bdev = bdget_disk(disk, 0);
+ if (bdev) {
+ down(&bdev->bd_inode->i_sem);
+ i_size_write(bdev->bd_inode, size << SECTOR_SHIFT);
+ up(&bdev->bd_inode->i_sem);
+ bdput(bdev);
+ }
+}
+
static int __bind(struct mapped_device *md, struct dm_table *t)
{
request_queue_t *q = md->queue;
@@ -673,7 +687,7 @@
md->map = t;

size = dm_table_get_size(t);
- set_capacity(md->disk, size);
+ __set_size(md->disk, size);
if (size == 0)
return 0;

@@ -692,7 +706,6 @@
dm_table_event_callback(md->map, NULL, NULL);
dm_table_put(md->map);
md->map = NULL;
- set_capacity(md->disk, 0);
}

/*