From 3c4bb26b213e618473e486776483a5bad15ba6da Mon Sep 17 00:00:00 2001
From: Chris Mason <chris.mason@oracle.com>
Date: Tue, 27 Mar 2012 18:56:56 -0400
Subject: Btrfs: flush out and clean up any block device pages during mount
Btrfs puts the filesystem metadata into its own address space, and
somehow the block device address space isn't getting onto disk properly
before a mount. The end result is that a loop of mkfs and mounting the
filesystem will sometimes find stale or incorrect data.
This commit should fix it by sprinkling fdatawrites and invalidate_bdev
calls around. This is a short term measure to make sure it is fixed.
The block devices really should be flushed and cleaned up higher in the
stack.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
---
fs/btrfs/disk-io.c | 1 +
fs/btrfs/volumes.c | 3 +++
2 files changed, 4 insertions(+)
(limited to 'fs/btrfs')
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 7b55eee15a5..fd43f6b2f43 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2031,6 +2031,7 @@ int open_ctree(struct super_block *sb,
__setup_root(4096, 4096, 4096, 4096, tree_root,
fs_info, BTRFS_ROOT_TREE_OBJECTID);
+ invalidate_bdev(fs_devices->latest_bdev);
bh = btrfs_read_dev_super(fs_devices->latest_bdev);
if (!bh) {
err = -EINVAL;
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 68a1754fe36..a872b48be0a 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -622,6 +622,8 @@ static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
printk(KERN_INFO "open %s failed\n", device->name);
goto error;
}
+ filemap_write_and_wait(bdev->bd_inode->i_mapping);
+ invalidate_bdev(bdev);
set_blocksize(bdev, 4096);
bh = btrfs_read_dev_super(bdev);
@@ -1354,6 +1356,7 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
}
set_blocksize(bdev, 4096);
+ invalidate_bdev(bdev);
bh = btrfs_read_dev_super(bdev);
if (!bh) {
ret = -EINVAL;
--
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