Rename frozen_bdev to suspended_bdev and move the bdget outside lockfs.
(This prepares for making lockfs optional.)
Signed-Off-By: Alasdair G Kergon <[email protected]>
Index: linux-2.6.14/drivers/md/dm.c
===================================================================
--- linux-2.6.14.orig/drivers/md/dm.c 2005-11-18 14:40:52.000000000 +0000
+++ linux-2.6.14/drivers/md/dm.c 2005-11-18 20:10:22.000000000 +0000
@@ -98,7 +98,7 @@ struct mapped_device {
* freeze/thaw support require holding onto a super block
*/
struct super_block *frozen_sb;
- struct block_device *frozen_bdev;
+ struct block_device *suspended_bdev;
};
#define MIN_IOS 256
@@ -847,9 +847,9 @@ static void __set_size(struct mapped_dev
{
set_capacity(md->disk, size);
- down(&md->frozen_bdev->bd_inode->i_sem);
- i_size_write(md->frozen_bdev->bd_inode, (loff_t)size << SECTOR_SHIFT);
- up(&md->frozen_bdev->bd_inode->i_sem);
+ down(&md->suspended_bdev->bd_inode->i_sem);
+ i_size_write(md->suspended_bdev->bd_inode, (loff_t)size << SECTOR_SHIFT);
+ up(&md->suspended_bdev->bd_inode->i_sem);
}
static int __bind(struct mapped_device *md, struct dm_table *t)
@@ -1021,43 +1021,27 @@ out:
*/
static int lock_fs(struct mapped_device *md)
{
- int r = -ENOMEM;
-
- md->frozen_bdev = bdget_disk(md->disk, 0);
- if (!md->frozen_bdev) {
- DMWARN("bdget failed in lock_fs");
- goto out;
- }
+ int r;
WARN_ON(md->frozen_sb);
- md->frozen_sb = freeze_bdev(md->frozen_bdev);
+ md->frozen_sb = freeze_bdev(md->suspended_bdev);
if (IS_ERR(md->frozen_sb)) {
r = PTR_ERR(md->frozen_sb);
- goto out_bdput;
+ md->frozen_sb = NULL;
+ return r;
}
/* don't bdput right now, we don't want the bdev
- * to go away while it is locked. We'll bdput
- * in unlock_fs
+ * to go away while it is locked.
*/
return 0;
-
-out_bdput:
- bdput(md->frozen_bdev);
- md->frozen_sb = NULL;
- md->frozen_bdev = NULL;
-out:
- return r;
}
static void unlock_fs(struct mapped_device *md)
{
- thaw_bdev(md->frozen_bdev, md->frozen_sb);
- bdput(md->frozen_bdev);
-
+ thaw_bdev(md->suspended_bdev, md->frozen_sb);
md->frozen_sb = NULL;
- md->frozen_bdev = NULL;
}
/*
@@ -1083,6 +1067,13 @@ int dm_suspend(struct mapped_device *md)
/* This does not get reverted if there's an error later. */
dm_table_presuspend_targets(map);
+ md->suspended_bdev = bdget_disk(md->disk, 0);
+ if (!md->suspended_bdev) {
+ DMWARN("bdget failed in dm_suspend");
+ r = -ENOMEM;
+ goto out;
+ }
+
/* Flush I/O to the device. */
r = lock_fs(md);
if (r)
@@ -1135,6 +1126,11 @@ int dm_suspend(struct mapped_device *md)
r = 0;
out:
+ if (r && md->suspended_bdev) {
+ bdput(md->suspended_bdev);
+ md->suspended_bdev = NULL;
+ }
+
dm_table_put(map);
up(&md->suspend_lock);
return r;
@@ -1165,6 +1161,9 @@ int dm_resume(struct mapped_device *md)
unlock_fs(md);
+ bdput(md->suspended_bdev);
+ md->suspended_bdev = NULL;
+
clear_bit(DMF_SUSPENDED, &md->flags);
dm_table_unplug_all(map);
-
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