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make sure you have installed btrfs-progs packagae on your system. To test first create a 1GB file : dd if=/dev/zero of=ext3.image bs=1MB count=1024 1024+0 records in 1024+0 records out 1024000000 bytes (1.0 GB) copied, 16.4318 s, 62.3 MB/s We will test both ext3 and ext4 file systems. # dd if=/dev/zero of=ext4.image bs=1MB count=1024 1024+0 records in 1024+0 records out 1024000000 bytes (1.0 GB) copied, 11.5822 s, 88.4 MB/s Format it as ext3 : # mkfs.ext3 ext3.image and ext4 : # mkfs.ext4 ext4.image Lets mount these file system and create some files : First create mount point directories- #mkdir /mnt/ext3 #mkdir /mnt/ext4 Okay. mount it - mount ext3.image /mnt/ext3/ -o loop mount ext4.image /mnt/ext4/ -o loop for i in {1..1000};do echo "giis" > /mnt/ext3/$i.txt ;done repeat the same for ext4. for i in {1..1000};do echo "giis" > /mnt/ext4/$i.txt ;done The setup is ready for conversion to btrfs.First make sure the existing ext3/ext4 file system are clean. #fsck.ext4 ext4.image e2fsck 1.41.9 (22-Aug-2009) ext4.image: recovering journal ext4.image: clean, 1011/62592 files, 9352/250000 blocks #fsck.ext4 ext4.image e2fsck 1.41.9 (22-Aug-2009) ext4.image: recovering journal ext4.image: clean, 1011/62592 files, 9352/250000 blocks Running "mount" command should say something like - /dev/loop0 on /mnt/ext4 type ext4 (rw) /dev/loop1 on /mnt/ext3 type ext3 (rw) Using btrfs-convert command to convert existing ext3/ext4 fs. # btrfs-convert ext3.image creating btrfs metadata. creating ext2fs image file. cleaning up system chunk. conversion complete. # btrfs-convert ext4.image creating btrfs metadata. creating ext2fs image file. cleaning up system chunk. conversion complete. now umount and remount the file system - umount /mnt/ext3 umount /mnt/ext4 mount -t btrfs ext4.image /mnt/ext4 -o loop mount ext3.image /mnt/ext3/ -o loop -t btrfs Now check the partition using mount command again - dev/loop1 on /mnt/ext3 type btrfs (rw) /dev/loop0 on /mnt/ext4 type btrfs (rw) How migrate/rollback from btrfs to ext4/ext3: #btrfs-convert -r ext4.image rollback complete. # btrfs-convert -r ext3.image rollback complete. |
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