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Date:   Sat, 21 Nov 2020 23:55:37 -0500
From:   Gabriel Krisman Bertazi <>
To:     Daniel Rosenberg <>
Cc:     "Theodore Y . Ts'o" <>,
        Jaegeuk Kim <>,
        Eric Biggers <>,
        Andreas Dilger <>,
        Chao Yu <>,
        Alexander Viro <>,
        Richard Weinberger <>,,,,,,,,
        Eric Biggers <>
Subject: Re: [PATCH v4 1/3] libfs: Add generic function for setting dentry_ops

Daniel Rosenberg <> writes:

> This adds a function to set dentry operations at lookup time that will
> work for both encrypted filenames and casefolded filenames.
> A filesystem that supports both features simultaneously can use this
> function during lookup preparations to set up its dentry operations once
> fscrypt no longer does that itself.
> Currently the casefolding dentry operation are always set if the
> filesystem defines an encoding because the features is toggleable on
> empty directories. Unlike in the encryption case, the dentry operations
> used come from the parent. Since we don't know what set of functions
> we'll eventually need, and cannot change them later, we enable the
> casefolding operations if the filesystem supports them at all.
> By splitting out the various cases, we support as few dentry operations
> as we can get away with, maximizing compatibility with overlayfs, which
> will not function if a filesystem supports certain dentry_operations.
> Signed-off-by: Daniel Rosenberg <>
> Reviewed-by: Eric Biggers <>

Reviewed-by: Gabriel Krisman Bertazi <>

Gabriel Krisman Bertazi

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