68 lines
2.5 KiB
Diff
68 lines
2.5 KiB
Diff
commit 5ffc903216901914dc2ad9715088d3fe9d1ef205
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Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Date: Tue Oct 8 15:45:29 2024 -0300
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misc: Add support for Linux uio.h RWF_ATOMIC flag
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Linux 6.11 adds the new flag for pwritev2 (commit
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c34fc6f26ab86d03a2d47446f42b6cd492dfdc56).
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Checked on x86_64-linux-gnu on 6.11 kernel.
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Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
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diff --git a/manual/llio.texi b/manual/llio.texi
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index 05ab44c6e7..0eb336f70b 100644
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--- a/manual/llio.texi
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+++ b/manual/llio.texi
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@@ -1381,6 +1381,19 @@ Per-IO synchronization as if the file was opened with @code{O_APPEND} flag.
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@item RWF_NOAPPEND
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This flag allows an offset to be honored, even if the file was opened with
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@code{O_APPEND} flag.
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+
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+@item RWF_ATOMIC
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+Indicate that the write is to be issued with torn-write prevention. The
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+input buffer should follow some contraints: the total length should be
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+power-of-2 in size and also sizes between @code{atomic_write_unit_min}
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+and @code{atomic_write_unit_max}, the @code{struct iovec} count should be
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+up to @code{atomic_write_segments_max}, and the offset should be
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+naturally-aligned with regard to total write length.
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+
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+The @code{atomic_*} values can be obtained with @code{statx} along with
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+@code{STATX_WRITE_ATOMIC} flag.
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+
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+This is a Linux-specific extension.
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@end vtable
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When the source file is compiled with @code{_FILE_OFFSET_BITS == 64} the
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diff --git a/misc/tst-preadvwritev2-common.c b/misc/tst-preadvwritev2-common.c
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index 8e04ff7282..4556421a43 100644
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--- a/misc/tst-preadvwritev2-common.c
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+++ b/misc/tst-preadvwritev2-common.c
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@@ -37,8 +37,11 @@
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#ifndef RWF_NOAPPEND
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# define RWF_NOAPPEND 0
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#endif
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+#ifndef RWF_ATOMIC
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+# define RWF_ATOMIC 0
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+#endif
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#define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT \
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- | RWF_APPEND | RWF_NOAPPEND)
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+ | RWF_APPEND | RWF_NOAPPEND | RWF_ATOMIC)
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/* Generic uio_lim.h does not define IOV_MAX. */
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#ifndef IOV_MAX
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diff --git a/sysdeps/unix/sysv/linux/bits/uio-ext.h b/sysdeps/unix/sysv/linux/bits/uio-ext.h
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index ead7a09156..85ed21bac5 100644
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--- a/sysdeps/unix/sysv/linux/bits/uio-ext.h
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+++ b/sysdeps/unix/sysv/linux/bits/uio-ext.h
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@@ -48,6 +48,8 @@ extern ssize_t process_vm_writev (pid_t __pid, const struct iovec *__lvec,
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#define RWF_NOWAIT 0x00000008 /* per-IO nonblocking mode. */
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#define RWF_APPEND 0x00000010 /* per-IO O_APPEND. */
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#define RWF_NOAPPEND 0x00000020 /* per-IO negation of O_APPEND */
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+#define RWF_ATOMIC 0x00000040 /* Write is to be issued with torn-write
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+ prevention. */
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__END_DECLS
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