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authorAndrew Patterson <andrew.patterson@hp.com>2008-09-04 14:27:25 -0600
committerJens Axboe <jens.axboe@oracle.com>2008-10-09 08:56:12 +0200
commitc3279d1454cdfed02a557d789d8a6d08ab4cbe70 (patch)
tree2591c7c0886f9b6b63aa40e3ef3caa984370c38b /fs
parent0c002c2f74e10baa9021d3ecc50585c6eafea568 (diff)
Adjust block device size after an online resize of a disk.
The revalidate_disk routine now checks if a disk has been resized by comparing the gendisk capacity to the bdev inode size. If they are different (usually because the disk has been resized underneath the kernel) the bdev inode size is adjusted to match the capacity. Signed-off-by: Andrew Patterson <andrew.patterson@hp.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'fs')
-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);