Talk Of "EXT5" File-System; Should EXT4 Be Frozen?
In the discussion that followed when it was found a nasty EXT4 file-system corruption bug hit recent Linux kernel stable releases, one user proposed that EXT4 be put in a feature-freeze mode and future work then be put towards an "EXT5" file-system, to which Ted Ts'o did respond.
In the Phoronix Forums discussion about the EXT4 corruption bug hitting the Linux 3.4/3.5/3.6 kernels, Ted Ts'o, the EXT4 file-system maintainer, ultimately jumped in on the discussion to respond to the numerous and polarized opinions of Phoronix readers.
One Phoronix reader suggested, "Maybe consider freezing all changes to Ext4 and make a new Ext5 for new ideas." Ted's response to this was:
We have considered this. Right now new features get added under experimental feature flags or mount options. One of the users who ran into problems were using experimental new features that are not enabled by default. We can't stop users from trying out new features that aren't enabled by default, just as we can't stop them from deciding to use ext5 instead of ext4 on production servers. Things like metadata checksums are not enabled by default specifically because they aren't ready yet. Brave users who try them out are invaluable, and I am grateful to people who help us do our testing, since that's the only way we can shake out the last bugs that aren't found in developer environments or via regression tests. But you make your choices, and take your chances when you turn on such experimental features.It's probably unlikely that we will see any EXT5 file-system for Linux anytime soon. Ted has also made some other file-system comments in this forum thread.
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