We didn't copy fsid to struct super_block.s_uuid so Overlay disables index feature with btrfs as the lower FS. kernel: overlayfs: fs on '/lower' does not support file handles, falling back to index=off. Fix this by publishing the fsid through struct super_block.s_uuid. Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx> --- I tried to know if in case did we deliberately missed this for some reason, however there is no information on that. If we mount a non-default subvol in the next mount/remount, its still the same FS, so publishing the FSID instead of subvol uuid is correct, OR I can't think any other reason for not using s_uuid for btrfs. fs/btrfs/disk-io.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 080e2ebb8aa0..b7e72d040442 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -2899,6 +2899,7 @@ int open_ctree(struct super_block *sb, sb->s_blocksize = sectorsize; sb->s_blocksize_bits = blksize_bits(sectorsize); + memcpy(&sb->s_uuid, fs_info->fsid, BTRFS_FSID_SIZE); mutex_lock(&fs_info->chunk_mutex); ret = btrfs_read_sys_array(fs_info); -- 2.13.1 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
