On Sun, Oct 18, 2009 at 10:35 PM, Prasad Joshi <prasadjoshi...@gmail.com> 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. > > 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. Yan, Zheng -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
