On 30.01.19 г. 9:39 ч., Qu Wenruo wrote:
> verify_one_dev_extent() will call btrfs_find_device() for each dev
> extent, this waste some CPU time just searching the devices list.
>
> Move the search one level up, into the btrfs_verify_dev_extents(), so
> for each device we only call btrfs_find_device() once.
>
> Signed-off-by: Qu Wenruo <w...@suse.com>
Seems the sane thing to do, so:
Reviewed-by: Nikolay Borisov <nbori...@suse.com>
> ---
> fs/btrfs/volumes.c | 26 ++++++++++++++++----------
> 1 file changed, 16 insertions(+), 10 deletions(-)
>
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index 2576b1a379c9..8e932d7d2fe6 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -7761,13 +7761,14 @@ static u64 calc_stripe_length(u64 type, u64
> chunk_len, int num_stripes)
> }
>
> static int verify_one_dev_extent(struct btrfs_fs_info *fs_info,
> - u64 chunk_offset, u64 devid,
> - u64 physical_offset, u64 physical_len)
> + struct btrfs_device *dev,
> + u64 chunk_offset, u64 physical_offset,
> + u64 physical_len)
> {
> struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree;
> struct extent_map *em;
> struct map_lookup *map;
> - struct btrfs_device *dev;
> + u64 devid = dev->devid;
> u64 stripe_len;
> bool found = false;
> int ret = 0;
> @@ -7819,12 +7820,6 @@ static int verify_one_dev_extent(struct btrfs_fs_info
> *fs_info,
> }
>
> /* Make sure no dev extent is beyond device bondary */
> - dev = btrfs_find_device(fs_info, devid, NULL, NULL);
> - if (!dev) {
> - btrfs_err(fs_info, "failed to find devid %llu", devid);
> - ret = -EUCLEAN;
> - goto out;
> - }
> if (physical_offset + physical_len > dev->disk_total_bytes) {
> btrfs_err(fs_info,
> "dev extent devid %llu physical offset %llu len %llu is beyond device
> boundary %llu",
> @@ -7874,6 +7869,7 @@ int btrfs_verify_dev_extents(struct btrfs_fs_info
> *fs_info)
> {
> struct btrfs_path *path;
> struct btrfs_root *root = fs_info->dev_root;
> + struct btrfs_device *device = NULL;
> struct btrfs_key key;
> u64 prev_devid = 0;
> u64 prev_dev_ext_end = 0;
> @@ -7917,6 +7913,16 @@ int btrfs_verify_dev_extents(struct btrfs_fs_info
> *fs_info)
> devid = key.objectid;
> physical_offset = key.offset;
>
> + if (!device || devid != device->devid) {
> + device = btrfs_find_device(fs_info, devid, NULL, NULL);
> + if (!device) {
> + btrfs_err(fs_info, "failed to find devid %llu",
> + devid);
> + ret = -EUCLEAN;
> + goto out;
> + }
> + }
> +
> dext = btrfs_item_ptr(leaf, slot, struct btrfs_dev_extent);
> chunk_offset = btrfs_dev_extent_chunk_offset(leaf, dext);
> physical_len = btrfs_dev_extent_length(leaf, dext);
> @@ -7930,7 +7936,7 @@ int btrfs_verify_dev_extents(struct btrfs_fs_info
> *fs_info)
> goto out;
> }
>
> - ret = verify_one_dev_extent(fs_info, chunk_offset, devid,
> + ret = verify_one_dev_extent(fs_info, device, chunk_offset,
> physical_offset, physical_len);
> if (ret < 0)
> goto out;
>
