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From:   Luis Henriques <lhenriques@suse.de>
To:     Alejandro Colomar <alx.manpages@gmail.com>,
        Michael Kerrisk <mtk.manpages@gmail.com>,
        Amir Goldstein <amir73il@gmail.com>,
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Cc:     ceph-devel@vger.kernel.org, linux-kernel@vger.kernel.org,
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        linux-man@vger.kernel.org, Luis Henriques <lhenriques@suse.de>
Subject: [PATCH] copy_file_range.2: Kernel v5.12 updates
Date:   Wed, 24 Feb 2021 14:23:07 +0000
Message-Id: <20210224142307.7284-1-lhenriques@suse.de>
In-Reply-To: <20210222102456.6692-1-lhenriques@suse.de>
References: <20210222102456.6692-1-lhenriques@suse.de>
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Update man-page with recent changes to this syscall.

Signed-off-by: Luis Henriques <lhenriques@suse.de>
---
Hi!

Here's a suggestion for fixing the manpage for copy_file_range().  Note that
I've assumed the fix will hit 5.12.

 man2/copy_file_range.2 | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/man2/copy_file_range.2 b/man2/copy_file_range.2
index 611a39b8026b..b0fd85e2631e 100644
--- a/man2/copy_file_range.2
+++ b/man2/copy_file_range.2
@@ -169,6 +169,9 @@ Out of memory.
 .B ENOSPC
 There is not enough space on the target filesystem to complete the copy.
 .TP
+.B EOPNOTSUPP
+The filesystem does not support this operation.
+.TP
 .B EOVERFLOW
 The requested source or destination range is too large to represent in the
 specified data types.
@@ -187,7 +190,7 @@ refers to an active swap file.
 .B EXDEV
 The files referred to by
 .IR fd_in " and " fd_out
-are not on the same mounted filesystem (pre Linux 5.3).
+are not on the same mounted filesystem (pre Linux 5.3 and post Linux 5.12).
 .SH VERSIONS
 The
 .BR copy_file_range ()
@@ -202,6 +205,11 @@ Applications should target the behaviour and requirements of 5.3 kernels.
 .PP
 First support for cross-filesystem copies was introduced in Linux 5.3.
 Older kernels will return -EXDEV when cross-filesystem copies are attempted.
+.PP
+After Linux 5.12, support for copies between different filesystems was dropped.
+However, individual filesystems may still provide
+.BR copy_file_range ()
+implementations that allow copies across different devices.
 .SH CONFORMING TO
 The
 .BR copy_file_range ()