btrfs: add a helpers for read repair testing
Add a few helpers to consolidate code for btrfs read repair testing:
- _btrfs_get_first_logical() gets the btrfs logical address for the
first extent in a file
- _btrfs_get_device_path and _btrfs_get_physical use the
btrfs-map-logical tool to find the device path and physical address
for btrfs logical address for a specific mirror
- _btrfs_direct_read_on_mirror and _btrfs_buffered_read_on_mirror
read the data from a specific mirror
These will be used to consolidate the read repair tests and avoid
duplication for new tests.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>
2 files changed
