On Mon, Oct 19, 2009 at 7:56 AM, Yan, Zheng <yanzheng@xxxxxxxx> wrote: > On Sun, Oct 18, 2009 at 10:35 PM, Prasad Joshi <prasadjoshi124@xxxxxxxxx> wrote: >> Hi, >> >> I tried using the btrfs-convert utility to convert the ext2 fs to >> btrfs. After the conversion was over, just to verify the correctness >> of operation, ran btrfsck on the device. It showed errors 800. I am >> not sure what does it mean, so thought of repoting it on mailing list. >> >> # btrfsck /dev/sdb >> root 256 inode 257 errors 800 >> found 1105965056 bytes used err is 1 >> total csum bytes: 192576 >> total tree bytes: 459956224 >> total fs tree bytes: 449585152 >> btree space waste bytes: 191448023 >> file data blocks allocated: 843206656 >> referenced 843206656 >> Btrfs v0.19-3-g6f3cf25-dirty > > "root 256 inode 257" is the ext2 image file. Checksum for file extents in > the ext2 image file is very special, so btrfsck treat it as error. This error > has no harm, it will go away after deleting the ext2 image file. OKay thanks. > >> >> I also found that, after the conversion of FS from ext2 to btrfs >> %usage gone up drastically. I mean before the conversion ext2 FS was >> 22% full but then converted btrfs is 64% used. >> >> Steps Followed >> =========== >> 1. Created an ext2 filesystem of size 2G >> 2. Created about 178 files of size 1M in a directory. FS was 11% full >> after the operation. >> 3. In another directory create near about 1 Lac files of very small >> size (2K). I kept on creating files till the number of available >> inodes were exhausted. >> >> # fsck /dev/sdb >> fsck 1.41.3 (12-Oct-2008) >> e2fsck 1.41.3 (12-Oct-2008) >> /dev/sdb: clean, 131072/131072 files, 188721/524288 blocks >> >> At this point df -kh output showed that FS as 22% full >> >> 4. Tried to convert the ext2 FS to btrfs using btrfs-convert utility >> >> # btrfs-convert /dev/sdb >> creating btrfs metadata. >> creating ext2fs image file. >> cleaning up system chunk. >> conversion complete. >> >> 5. Ran btrfsck. >> >> 6. Mounted the file system >> >> # df -kh >> Filesystem Size Used Avail Use% Mounted on >> .... >> .... >> tmpfs 251M 104K 251M 1% /dev/shm >> /dev/sdb 2.0G 1.3G 740M 64% /mnt/fs >> >> As you can see df displays FS is 64% full, when infact before >> conversion it was onlly 22% full. Why is so much increase in >> percentage usage? > > This is a accounting bug, it's already fixed in btrfs-progs-unstable tree. I am using the latest btrfs-progs-unstable tree. I had cloned the git repository, I used the same updated repository. Is there any other repository than the one declared on Wiki Page? I used cloned repo from git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-progs-unstable.git Thanks, Prasad > > Yan, Zheng > -- 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
