3.17.3 incorporates a fix for converting ext4 to btrfs: http://git.kernel.org/cgit/linux/kernel/git/mason/btrfs-progs.git/commit/?id=ad96e8f4d656b6b46253b2122a96d5e9c4a17b18 It may help fixing the problem which I am facing since several kernel and btrs-progs releases. Never got a clean conversion from ext4 to btrfs, btrfs-progs is always complaining something is wrong. See below: Reproducible: Always Actual Results: supah ef # btrfs-convert /dev/sdb2 creating btrfs metadata. creating ext2fs image file. cleaning up system chunk. conversion complete. supah ef # btrfsck /dev/sdb2 Checking filesystem on /dev/sdb2 UUID: 6f73e62c-cc08-4e9d-8c2d-0a9ada6be131 checking extents checking free space cache checking fs roots root 256 inode 257 errors 800, odd csum item found 5027286346 bytes used err is 1 total csum bytes: 8150716 total tree bytes: 1189072896 total fs tree bytes: 1110675456 total extent tree bytes: 64163840 btree space waste bytes: 315077607 file data blocks allocated: 19114659840 referenced 19114659840 Btrfs v3.17.1 supah ef # mount /dev/sdb2 /media/temp/ supah ef # umount /media/temp/ supah ef # btrfsck /dev/sdb2 Checking filesystem on /dev/sdb2 UUID: 6f73e62c-cc08-4e9d-8c2d-0a9ada6be131 checking extents checking free space cache checking fs roots root 256 inode 257 errors 800, odd csum item found 4974440021 bytes used err is 1 total csum bytes: 8150716 total tree bytes: 1189109760 total fs tree bytes: 1110675456 total extent tree bytes: 64184320 btree space waste bytes: 315105476 file data blocks allocated: 19120295936 referenced 19120295936 Btrfs v3.17.1 supah ef # mount /dev/sdb2 /media/temp/ supah ef # btrfs subvol list /media/temp/ ID 256 gen 166 top level 5 path ext2_saved supah ef # btrfs subvol delete /media/temp/ext2_saved/ Transaction commit: none (default) Delete subvolume '/media/temp/ext2_saved' supah ef # umount /media/temp/ supah ef # btrfsck /dev/sdb2 Checking filesystem on /dev/sdb2 UUID: 6f73e62c-cc08-4e9d-8c2d-0a9ada6be131 checking extents checking free space cache checking fs roots checking csums There are no extents for csum range 0-69632 Csum exists for 0-69632 but there is no extent record found 4976598497 bytes used err is 1 total csum bytes: 8150716 total tree bytes: 1189117952 total fs tree bytes: 1110675456 total extent tree bytes: 64192512 btree space waste bytes: 315113457 file data blocks allocated: 19120295936 referenced 19120295936 Btrfs v3.17.1
Meanwhile 3.18 was released.
+*btrfs-progs-3.18 (01 Jan 2015) +*btrfs-progs-3.17.3 (01 Jan 2015) + + 01 Jan 2015; Mike Gilbert <floppym@gentoo.org> +btrfs-progs-3.17.3.ebuild, + +btrfs-progs-3.18.ebuild: + Version bump, bug 533850.
Thanks! (and) Happy new year!
