Re: [PATCH] preadv2: Note preadv2(..., RWF_NOWAIT) bug in BUGS section

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Hi Will,

On 6/1/21 4:15 PM, Will Manley wrote:
To save the next person before they fall foul of it.  See
https://lore.kernel.org/linux-fsdevel/fea8b16d-5a69-40f9-b123-e84dcd6e8f2e@xxxxxxxxxxxxxxxx/T/#u
and https://github.com/tokio-rs/tokio/issues/3803 for more information.

Thanks. Patch applied.
Sorry for the delay!

I applied a few minor tweaks to your patch. See
<https://github.com/alejandro-colomar/man-pages/commits/main>.
I also added a signed-off-by line on your behalf.

Thanks,

Alex

---
  man2/readv.2 | 11 ++++++++++-
  1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/man2/readv.2 b/man2/readv.2
index df42cf830..3355fa9d7 100644
--- a/man2/readv.2
+++ b/man2/readv.2
@@ -243,7 +243,9 @@ If some data was successfully read, it will return the number of bytes read.
  If no bytes were read, it will return \-1 and set
  .IR errno
  to
-.BR EAGAIN .
+.BR EAGAIN
+(but see
+.BR BUGS ")."
  Currently, this flag is meaningful only for
  .BR preadv2 ().
  .TP
@@ -425,6 +427,13 @@ iov[1].iov_len = strlen(str1);
  nwritten = writev(STDOUT_FILENO, iov, 2);
  .EE
  .in
+.SH BUGS
+Linux v5.9 and v5.10 have a bug where
+.BR preadv2()
+with the
+.BR RWF_NOWAIT
+flag may return 0 even when not at end of file.  See
+https://lore.kernel.org/linux-fsdevel/fea8b16d-5a69-40f9-b123-e84dcd6e8f2e@xxxxxxxxxxxxxxxx/T/#u
  .SH SEE ALSO
  .BR pread (2),
  .BR read (2),



--
Alejandro Colomar
Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/
http://www.alejandro-colomar.es/



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