On Sep 25, 2007 23:40 -0600, Jim Cromie wrote: > kernel learner wrote: > >ext3 filesystem has 32-bit block address and ext4 filesystem has > >48-bit block address. If a user installs ext4, how will the file > >system handle already existing block with 32 bit values? > > Why should it ? thats what ext3 is for. Bzzt. Wrong answer. The ext4 code will be able to read existing ext3 (and ext2) filesystems just fine. Otherwise there wouldn't be much of an upgrade path. > Id expect ext4 drivers handling ext3 filesystems is a distant, secondary > goal to getting a fast, reliable, clean 48bit filesystem working. Far from the truth. One of the main goals of ext4 is that it is a drop-in replacement for ext3. The code is mostly incremental improvements over ext3, and that IS one of the reasons that it is reliable. We didn't throw away 10 years of bug fixes in the ext2/ext3 code when adding the ext4 features. Cheers, Andreas -- Andreas Dilger Principal Software Engineer Cluster File Systems, Inc. - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
