On Sat, Feb 13, 2016 at 10:01:36AM +0800, Anand Jain wrote:
> btrfs_rm_device() has a section of the code which can be replaced
> btrfs_find_device_by_user_input()
>
> Signed-off-by: Anand Jain <[email protected]>
> ---
> fs/btrfs/volumes.c | 100
> ++++++++++++++++++++---------------------------------
> 1 file changed, 37 insertions(+), 63 deletions(-)
>
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index 889fc0c..1324a9f 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -1750,13 +1750,11 @@ int btrfs_rm_device(struct btrfs_root *root, char
> *device_path)
> {
> struct btrfs_device *device;
> struct btrfs_device *next_device;
> - struct block_device *bdev;
> + struct block_device *bdev = NULL;
> struct buffer_head *bh = NULL;
> - struct btrfs_super_block *disk_super;
> + struct btrfs_super_block *disk_super = NULL;
disk_super is NULL here and unchanged until ...
> struct btrfs_fs_devices *cur_devices;
> - u64 devid;
> u64 num_devices;
> - u8 *dev_uuid;
> int ret = 0;
> bool clear_super = false;
>
> @@ -1766,57 +1764,19 @@ int btrfs_rm_device(struct btrfs_root *root, char
> *device_path)
> if (ret)
> goto out;
>
> - if (strcmp(device_path, "missing") == 0) {
> - struct list_head *devices;
> - struct btrfs_device *tmp;
> -
> - device = NULL;
> - devices = &root->fs_info->fs_devices->devices;
> - /*
> - * It is safe to read the devices since the volume_mutex
> - * is held.
> - */
> - list_for_each_entry(tmp, devices, dev_list) {
> - if (tmp->in_fs_metadata &&
> - !tmp->is_tgtdev_for_dev_replace &&
> - !tmp->bdev) {
> - device = tmp;
> - break;
> - }
> - }
> - bdev = NULL;
> - bh = NULL;
> - disk_super = NULL;
> - if (!device) {
> - ret = BTRFS_ERROR_DEV_MISSING_NOT_FOUND;
> - goto out;
> - }
> - } else {
> - ret = btrfs_get_bdev_and_sb(device_path,
> - FMODE_WRITE | FMODE_EXCL,
> - root->fs_info->bdev_holder, 0,
> - &bdev, &bh);
> - if (ret)
> - goto out;
> - disk_super = (struct btrfs_super_block *)bh->b_data;
> - devid = btrfs_stack_device_id(&disk_super->dev_item);
> - dev_uuid = disk_super->dev_item.uuid;
> - device = btrfs_find_device(root->fs_info, devid, dev_uuid,
> - disk_super->fsid);
> - if (!device) {
> - ret = -ENOENT;
> - goto error_brelse;
> - }
> - }
> + ret = btrfs_find_device_by_user_input(root, 0, device_path,
> + &device);
> + if (ret)
> + goto out;
>
> if (device->is_tgtdev_for_dev_replace) {
> ret = BTRFS_ERROR_DEV_TGT_REPLACE;
> - goto error_brelse;
> + goto out;
> }
>
> if (device->writeable && root->fs_info->fs_devices->rw_devices == 1) {
> ret = BTRFS_ERROR_DEV_ONLY_WRITABLE;
> - goto error_brelse;
> + goto out;
> }
>
> if (device->writeable) {
> @@ -1906,16 +1866,33 @@ int btrfs_rm_device(struct btrfs_root *root, char
> *device_path)
> * at this point, the device is zero sized. We want to
> * remove it from the devices list and zero out the old super
> */
> - if (clear_super && disk_super) {
> + if (clear_super) {
> u64 bytenr;
> int i;
>
> + if (!disk_super) {
... here, so this will always take this branch
> + ret = btrfs_get_bdev_and_sb(device_path,
> + FMODE_WRITE | FMODE_EXCL,
> + root->fs_info->bdev_holder, 0,
> + &bdev, &bh);
> + if (ret) {
> + /*
> + * It could be a failed device ok for
> clear_super
> + * to fail. So return success
> + */
> + ret = 0;
> + goto out;
> + }
> +
> + disk_super = (struct btrfs_super_block *)bh->b_data;
> + }
The patch looks otherwise good so I'm curious if this is a leftover or
I'm missing some logic behind that.
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