Raid56 readahead can not work in current code, reada_find_extent() will show warning of bbio->num_stripes > BTRFS_MAX_MIRRORS, because raid56 have parity strip, which makes more bbio->num_stripes.
The reason why we haven't see above error is because another bug in __btrfs_map_block(), which make raid56 readahead do nothing. Before we will fix bug in __btrfs_map_block(), we need to disable raid56 temporary, to avoid above warning. Signed-off-by: Zhao Lei <[email protected]> --- fs/btrfs/reada.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c index 619f929..7bbd656 100644 --- a/fs/btrfs/reada.c +++ b/fs/btrfs/reada.c @@ -363,6 +363,11 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root, if (ret || !bbio || length < blocksize) goto error; + if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) { + /* Current code can not support RAID56 yet */ + goto error; + } + if (bbio->num_stripes > BTRFS_MAX_MIRRORS) { btrfs_err(root->fs_info, "readahead: more than %d copies not supported", -- 1.8.5.1 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
