From 8ed01abe7da6af62f2089da9a4c1fe839dc638f5 Mon Sep 17 00:00:00 2001 From: Anand Jain Date: Thu, 14 Apr 2016 18:24:10 +0800 Subject: [PATCH] btrfs: s_bdev is not null after missing replace 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 Reported-by: Yauhen Kharuzhy Signed-off-by: David Sterba --- fs/btrfs/dev-replace.c | 3 ++- fs/btrfs/volumes.c | 6 ++++-- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c index 5aebedf..c93eec9 100644 --- a/fs/btrfs/dev-replace.c +++ b/fs/btrfs/dev-replace.c @@ -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; diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index e43b01e..41bc384 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -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; -- 2.7.4