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btrfs: s_bdev is not null after missing replace

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Yauhen reported in the ML that s_bdev is null at mount, and
s_bdev gets updated to some device when missing device is
replaced, as because bdev is null for missing device, things
gets matched up. Fix this by checking if s_bdev is set. I
didn't want to completely remove updating s_bdev because
the future multi device support at vfs layer may need it.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reported-by: Yauhen Kharuzhy <yauhen.kharuzhy@zavadatar.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2016-04-14 18:24:10 +08:00 committed by David Sterba
parent b5255456c5
commit 8ed01abe7d
2 changed files with 6 additions and 3 deletions
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3
fs/btrfs/dev-replace.c
View File

@ -569,7 +569,8 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
ASSERT(list_empty(&src_device->resized_list));
tgt_device->commit_total_bytes = src_device->commit_total_bytes;
tgt_device->commit_bytes_used = src_device->bytes_used;
if (fs_info->sb->s_bdev == src_device->bdev)
if (fs_info->sb->s_bdev &&
(fs_info->sb->s_bdev == src_device->bdev))
fs_info->sb->s_bdev = tgt_device->bdev;
if (fs_info->fs_devices->latest_bdev == src_device->bdev)
fs_info->fs_devices->latest_bdev = tgt_device->bdev;

6
fs/btrfs/volumes.c
View File

@ -1848,7 +1848,8 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path, u64 devid)
next_device = list_entry(root->fs_info->fs_devices->devices.next,
struct btrfs_device, dev_list);
if (device->bdev == root->fs_info->sb->s_bdev)
if (root->fs_info->sb->s_bdev &&
(root->fs_info->sb->s_bdev == device->bdev))
root->fs_info->sb->s_bdev = next_device->bdev;
if (device->bdev == root->fs_info->fs_devices->latest_bdev)
root->fs_info->fs_devices->latest_bdev = next_device->bdev;
@ -1996,7 +1997,8 @@ void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
next_device = list_entry(fs_info->fs_devices->devices.next,
struct btrfs_device, dev_list);
if (tgtdev->bdev == fs_info->sb->s_bdev)
if (fs_info->sb->s_bdev &&
(tgtdev->bdev == fs_info->sb->s_bdev))
fs_info->sb->s_bdev = next_device->bdev;
if (tgtdev->bdev == fs_info->fs_devices->latest_bdev)
fs_info->fs_devices->latest_bdev = next_device->bdev;