From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Yan, Zheng " Subject: Re: Errors in btrfsck after converting ext2 FS to btrfs. Date: Mon, 19 Oct 2009 10:26:32 +0800 Message-ID: <3d0408630910181926h69763e86w9041160cdc2c10bc@mail.gmail.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Cc: linux-btrfs@vger.kernel.org To: Prasad Joshi Return-path: In-Reply-To: List-ID: On Sun, Oct 18, 2009 at 10:35 PM, Prasad Joshi 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= =2E > > # 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 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > 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=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 Size=A0 Used Avail Use% M= ounted on > .... > .... > tmpfs=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 251M=A0 104K=A0= 251M=A0=A0 1% /dev/shm > /dev/sdb=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 2.0G=A0 1.3G=A0 740M=A0= 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 tr= ee. Yan, Zheng -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" = in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html