What were you trying to do that didn't work?

When assigning xfs project ids on a directory tree, special files are excluded, which can lead to errors when performing certain operations later.

Example below

Please provide the package NVR for which bug is seen:

RHEL 8 kernels, RHEL 9 kernels, likely upstream

How reproducible:

easy

Steps to reproduce

create directory containing special file:

# mkdir /var/tmp/testdir
# mkfifo /var/tmp/testdir/fifo1

setup project for the directory:

 # xfs_quota -xc 'project -sp /var/tmp/testdir 9' /
Setting up project 9 (path /var/tmp/testdir)...
xfs_quota: skipping special file /var/tmp/testdir/fifo1
Processed 1 (/etc/projects and cmdline) paths for project 9 with recursion depth infinite (-1).

attempt to hardlink the special file:

 # ln /var/tmp/testdir/fifo1 /var/tmp/testdir/fifo1_link
ln: failed to create hard link '/var/tmp/testdir/fifo1_link' => '/var/tmp/testdir/fifo1': Invalid cross-device link

newly-created special files are linkable:

# mkfifo /var/tmp/testdir/fifo2
# ln /var/tmp/testdir/fifo2 /var/tmp/testdir/fifo2_link

(unclear what/if other operations besides 'ln' will result in errors)

Expected results

existing special files behave like newly-created special files

Actual results

error messages on excluded existing special files