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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
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>
-rw-r--r--fs/block_dev.c37
-rw-r--r--include/linux/fs.h2
2 files changed, 39 insertions, 0 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 4eeb69a88734..b721955d382e 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);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index d63461f97983..32477e8872d5 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1722,6 +1722,8 @@ extern int fs_may_remount_ro(struct super_block *);
*/
#define bio_data_dir(bio) ((bio)->bi_rw & 1)
+extern void check_disk_size_change(struct gendisk *disk,
+ struct block_device *bdev);
extern int revalidate_disk(struct gendisk *);
extern int check_disk_change(struct block_device *);
extern int __invalidate_device(struct block_device *);