[LU-6220] push ext4/ldiskfs patches upstream if possible

Duplicate — Sat, 13 Jan 2024 17:27:57 +0000

There are a number of ldiskfs patches that we could potentially push upstream, possibly with some cleanups. All patches should be run through checkpatch.pl first.

ext4-print-inum-in-htree-warning.patch: could be pushed upstream after moving string to the next line so it fits inside 80 columns
ext4-disable-mb-cache.patch: I was involved in some discussion upstream about removing the mbcache (http://lwn.net/Articles/564802/), but that patch was never accepted upstream. We could try pushing this patch again, since it is fairly simple, and it wouldn't be very incompatible with the other mbcache speedup patch if that was ever landed.
ext4-inode-version.patch: It might be possible to submit a patch upstream that moves dir->i_version++ into ext4_mark_iloc_dirty() like if (IS_I_VERSION(inode) || S_ISDIR(dir)). Then, we can add a mount flag or patch that makes this check a no-op so we only need a very small patch. More importantly, it will reduce the size of ext4_inode_info because we don't need a separate i_fs_version and reduce the memory usage on the MDS.
ext4-journal-path-opt.patch: I think this can be pushed upstream without any significant changes
ext4-kill-dx-root.patch: could be submitted upstream as a cleanup with some style fixes
ext4-max-dir-size.patch: we should print out a deprecation warning in newer kernels to mount with "-o max_dir_size_kb" instead, and then we can eventually remove it? The mount option has existed since kernel 3.6, maybe it would be better to backport support for the mount option to RHEL6 instead of maintaining this patch forever?
ext4-large-eas.patch: this is described in ~~LU-908~~

Whamcloud Community JIRA

[LU-6220] push ext4/ldiskfs patches upstream if possible