[Bug 273414] linuxulator regression in symlinks under zfs

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273414

--- Comment #2 from Dmitry Chagin <dchagin@FreeBSD.org> ---
here it rather makes sense to speak about regression in vfs/namecache/ufs due
to the fact that:
1. starting from
https://cgit.freebsd.org/src/commit/sys/kern/vfs_cache.c?id=739ecbcf1c4fd22b5f6ee0bb180a67644046a3e0
file systems should cache symbolic link targets on their own. This method is
not implemented for UFS, so the described bug does not occur for UFS.

2. UFS currently does not use namecache at all, so this bug does not occur. See
here: https://reviews.freebsd.org/D41337, https://reviews.freebsd.org/D41338

I think it would be correct to modify the algorithm of the namei() and
cache_fplookup() functions so that file systems are not responsible for caching
symlink targets, ie, cache_fplookup() should stop its loop and return PARTIAL
in case of a symbolic link, and namei() should resolve the symlink and go to
the cache lookup starting from the current directory.

As a temporary fix, try this patch, please:
https://people.freebsd.org/~dchagin/vfs.patch

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