[Bug 270988] vfs: Fix 'emptydir' mount option and vfs_emptydir()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270988

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A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=6450e7bbad0c68176f28b51773a3af5d6022c7dd

commit 6450e7bbad0c68176f28b51773a3af5d6022c7dd
Author:     Olivier Certner <olce.freebsd@certner.fr>
AuthorDate: 2023-04-22 16:07:07 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2023-04-28 01:27:54 +0000

    vfs: Fix "emptydir" mount option

    Fix vfs_emptydir(). It would consider directories containing directories
    with name of the form 'X.' (X being any authorized byte) as empty. Also,
    it would cause VOP_READDIR() to return an error on directories
    containing enough whiteouts. While here, use a more decently sized
    buffer as done elsewhere.

    Remove ad-hoc iteration on the directory's content and instead use the
    newly exported vn_dir_next_dirent() function (this is what fixes the
    second problem mentioned above).

    PR:     270988
    Reviewed by:    kib
    MFC after:      1 week
    Differential Revision:  https://reviews.freebsd.org/D39775

 sys/kern/vfs_subr.c | 115 ++++++++++++++++++++++++++++++----------------------
 1 file changed, 67 insertions(+), 48 deletions(-)

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