Delayed alloc bug
We should actually get this error
dd: writing to `myfile5': No space left on device
root@x300-qemu-image:~# mount /dev/hdc -t ext4dev -o delalloc,data=writeback /ext4 root@x300-qemu-image:/ext4# df -h . Filesystem Size Used Avail Use% Mounted on /dev/hdc 49M 46M 94K 100% /ext4 root@x300-qemu-image:/ext4# root@x300-qemu-image:/ext4# root@x300-qemu-image:/ext4# root@x300-qemu-image:/ext4# dd if=/dev/zero of=myfile 34188+0 records in 34187+0 records out 17503744 bytes (18 MB) copied, 11.2724 seconds, 1.6 MB/s
root@x300-qemu-image:/ext4# df -h . Filesystem Size Used Avail Use% Mounted on /dev/hdc 49M 49M 0 100% /ext4 root@x300-qemu-image:/ext4# dd if=/dev/zero of=myfile5 49777+0 records in 49777+0 records out 25485824 bytes (25 MB) copied, 19.7667 seconds, 1.3 MB/s
root@x300-qemu-image:/ext4# df -h . Filesystem Size Used Avail Use% Mounted on /dev/hdc 49M 49M 0 100% /ext4 root@x300-qemu-image:/ext4#