From 4306a97449f9a0f9e5229af7889d4401315355aa Mon Sep 17 00:00:00 2001 From: Anand Jain Date: Tue, 29 May 2018 12:28:37 +0800 Subject: [PATCH] btrfs: do btrfs_free_stale_devices outside of device_list_add btrfs_free_stale_devices() looks for device path reused for another filesystem, and deletes the older fs_devices::device entry. In preparation to handle locking in device_list_add, move btrfs_free_stale_devices outside as these two functions serve a different purpose. Signed-off-by: Anand Jain Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/volumes.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 3c3359d7e91d..c84a9e22daf1 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -747,7 +747,8 @@ error_brelse: * error pointer when failed */ static noinline struct btrfs_device *device_list_add(const char *path, - struct btrfs_super_block *disk_super) + struct btrfs_super_block *disk_super, + bool *new_device_added) { struct btrfs_device *device; struct btrfs_fs_devices *fs_devices; @@ -793,7 +794,7 @@ static noinline struct btrfs_device *device_list_add(const char *path, mutex_unlock(&fs_devices->device_list_mutex); device->fs_devices = fs_devices; - btrfs_free_stale_devices(path, device); + *new_device_added = true; if (disk_super->label[0]) pr_info("BTRFS: device label %s devid %llu transid %llu %s\n", @@ -1204,6 +1205,7 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, struct btrfs_fs_devices **fs_devices_ret) { struct btrfs_super_block *disk_super; + bool new_device_added = false; struct btrfs_device *device; struct block_device *bdev; struct page *page; @@ -1229,11 +1231,14 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, } mutex_lock(&uuid_mutex); - device = device_list_add(path, disk_super); - if (IS_ERR(device)) + device = device_list_add(path, disk_super, &new_device_added); + if (IS_ERR(device)) { ret = PTR_ERR(device); - else + } else { *fs_devices_ret = device->fs_devices; + if (new_device_added) + btrfs_free_stale_devices(path, device); + } mutex_unlock(&uuid_mutex); btrfs_release_disk_super(page); -- 2.30.2