From: Anand Jain Date: Wed, 13 Aug 2014 06:24:22 +0000 (+0800) Subject: btrfs: update sprout seed pointer when seed fs is relinquished X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=94d5f0c2ae83c367fe870b49ed0c87025be2956e;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git btrfs: update sprout seed pointer when seed fs is relinquished We are not updating sprout fs seed pointer when all seed device is replaced. This patch will check if all seed device has been replaced and then update the sprout pointer accordingly. Same reproducer as in the previous patch would apply here. And notice that btrfs_close_device will check if seed fs is present and spits out the error with out this patch. int btrfs_close_devices(struct btrfs_fs_devices *fs_devices) { :: seed_devices = fs_devices->seed; :: while (seed_devices) { fs_devices = seed_devices; seed_devices = fs_devices->seed; __btrfs_close_devices(fs_devices); free_fs_devices(fs_devices); } Signed-off-by: Anand Jain Signed-off-by: Chris Mason --- diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 361a66e2c179..27a14f1c5a7c 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -1848,6 +1848,27 @@ void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info, } call_rcu(&srcdev->rcu, free_device); + + /* + * unless fs_devices is seed fs, num_devices shouldn't go + * zero + */ + BUG_ON(!fs_devices->num_devices && !fs_devices->seeding); + + /* if this is no devs we rather delete the fs_devices */ + if (!fs_devices->num_devices) { + struct btrfs_fs_devices *tmp_fs_devices; + + tmp_fs_devices = fs_info->fs_devices; + while (tmp_fs_devices) { + if (tmp_fs_devices->seed == fs_devices) { + tmp_fs_devices->seed = fs_devices->seed; + break; + } + tmp_fs_devices = tmp_fs_devices->seed; + } + fs_devices->seed = NULL; + } } void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,