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* [PATCH] io_uring_enter(2): Clarify how to read from and write to  non-seekable files
@ 2021-05-31 12:38 Alois Wohlschlager
  2021-06-01 17:10 ` Jens Axboe
  0 siblings, 1 reply; 2+ messages in thread
From: Alois Wohlschlager @ 2021-05-31 12:38 UTC (permalink / raw)
  To: io-uring

IORING_OP_READ* and IORING_OP_WRITE* all take a file offset. These
operations can still be used with non-seekable files, as long as the
offset is set to zero.

Signed-off-by: Alois Wohlschlager <[email protected]>
---
 man/io_uring_enter.2 | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/man/io_uring_enter.2 b/man/io_uring_enter.2
index 5b498e5..dd3c962 100644
--- a/man/io_uring_enter.2
+++ b/man/io_uring_enter.2
@@ -195,6 +195,9 @@ Vectored read and write operations, similar to
 .BR preadv2 (2)
 and
 .BR pwritev2 (2).
+If the file is not seekable,
+.I off
+must be set to zero.

 .TP
 .B IORING_OP_READ_FIXED
@@ -588,6 +591,10 @@ contains the buffer in question,
 contains the length of the IO operation, and
 .I offs
 contains the read or write offset. If
+.I fd
+does not refer to a seekable file,
+.I off
+must be set to zero. If
 .I offs
 is set to -1, the offset will use (and advance) the file position, like the
 .BR read(2)
--
2.31.1



^ permalink raw reply related	[flat|nested] 2+ messages in thread

* Re: [PATCH] io_uring_enter(2): Clarify how to read from and write to non-seekable files
  2021-05-31 12:38 [PATCH] io_uring_enter(2): Clarify how to read from and write to non-seekable files Alois Wohlschlager
@ 2021-06-01 17:10 ` Jens Axboe
  0 siblings, 0 replies; 2+ messages in thread
From: Jens Axboe @ 2021-06-01 17:10 UTC (permalink / raw)
  To: Alois Wohlschlager, io-uring

On 5/31/21 6:38 AM, Alois Wohlschlager wrote:
> IORING_OP_READ* and IORING_OP_WRITE* all take a file offset. These
> operations can still be used with non-seekable files, as long as the
> offset is set to zero.

Applied, thanks.

-- 
Jens Axboe


^ permalink raw reply	[flat|nested] 2+ messages in thread

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2021-05-31 12:38 [PATCH] io_uring_enter(2): Clarify how to read from and write to non-seekable files Alois Wohlschlager
2021-06-01 17:10 ` Jens Axboe

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