| Message ID | 20241008184634.245607-8-adhemerval.zanella@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | Updates for Linux 6.11 | expand |
On Wed, Oct 9, 2024 at 2:48 AM Adhemerval Zanella <adhemerval.zanella@linaro.org> wrote: > > Linux 6.11 adds the new flag for pwritev2 (commit > c34fc6f26ab86d03a2d47446f42b6cd492dfdc56). > > Checked on x86_64-linux-gnu on 6.11 kernel. > --- > manual/llio.texi | 13 +++++++++++++ > misc/tst-preadvwritev2-common.c | 5 ++++- > sysdeps/unix/sysv/linux/bits/uio-ext.h | 2 ++ > 3 files changed, 19 insertions(+), 1 deletion(-) > > diff --git a/manual/llio.texi b/manual/llio.texi > index 05ab44c6e7..0eb336f70b 100644 > --- a/manual/llio.texi > +++ b/manual/llio.texi > @@ -1381,6 +1381,19 @@ Per-IO synchronization as if the file was opened with @code{O_APPEND} flag. > @item RWF_NOAPPEND > This flag allows an offset to be honored, even if the file was opened with > @code{O_APPEND} flag. > + > +@item RWF_ATOMIC > +Indicate that the write is to be issued with torn-write prevention. The > +input buffer should follow some contraints: the total length should be > +power-of-2 in size and also sizes between @code{atomic_write_unit_min} > +and @code{atomic_write_unit_max}, the @code{struct iovec} count should be > +up to @code{atomic_write_segments_max}, and the offset should be > +naturally-aligned with regard to total write length. > + > +The @code{atomic_*} values can be obtained with @code{statx} along with > +@code{STATX_WRITE_ATOMIC} flag. > + > +This is a Linux-specific extension. > @end vtable > > When the source file is compiled with @code{_FILE_OFFSET_BITS == 64} the > diff --git a/misc/tst-preadvwritev2-common.c b/misc/tst-preadvwritev2-common.c > index 8e04ff7282..4556421a43 100644 > --- a/misc/tst-preadvwritev2-common.c > +++ b/misc/tst-preadvwritev2-common.c > @@ -37,8 +37,11 @@ > #ifndef RWF_NOAPPEND > # define RWF_NOAPPEND 0 > #endif > +#ifndef RWF_ATOMIC > +# define RWF_ATOMIC 0 > +#endif > #define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT \ > - | RWF_APPEND | RWF_NOAPPEND) > + | RWF_APPEND | RWF_NOAPPEND | RWF_ATOMIC) > > /* Generic uio_lim.h does not define IOV_MAX. */ > #ifndef IOV_MAX > diff --git a/sysdeps/unix/sysv/linux/bits/uio-ext.h b/sysdeps/unix/sysv/linux/bits/uio-ext.h > index ead7a09156..85ed21bac5 100644 > --- a/sysdeps/unix/sysv/linux/bits/uio-ext.h > +++ b/sysdeps/unix/sysv/linux/bits/uio-ext.h > @@ -48,6 +48,8 @@ extern ssize_t process_vm_writev (pid_t __pid, const struct iovec *__lvec, > #define RWF_NOWAIT 0x00000008 /* per-IO nonblocking mode. */ > #define RWF_APPEND 0x00000010 /* per-IO O_APPEND. */ > #define RWF_NOAPPEND 0x00000020 /* per-IO negation of O_APPEND */ > +#define RWF_ATOMIC 0x00000040 /* Write is to be issued with torn-write > + prevention. */ > > __END_DECLS > > -- > 2.43.0 > LGTM. Reviewed-by: H.J. Lu <hjl.tools@gmail.com> Thanks.
diff --git a/manual/llio.texi b/manual/llio.texi index 05ab44c6e7..0eb336f70b 100644 --- a/manual/llio.texi +++ b/manual/llio.texi @@ -1381,6 +1381,19 @@ Per-IO synchronization as if the file was opened with @code{O_APPEND} flag. @item RWF_NOAPPEND This flag allows an offset to be honored, even if the file was opened with @code{O_APPEND} flag. + +@item RWF_ATOMIC +Indicate that the write is to be issued with torn-write prevention. The +input buffer should follow some contraints: the total length should be +power-of-2 in size and also sizes between @code{atomic_write_unit_min} +and @code{atomic_write_unit_max}, the @code{struct iovec} count should be +up to @code{atomic_write_segments_max}, and the offset should be +naturally-aligned with regard to total write length. + +The @code{atomic_*} values can be obtained with @code{statx} along with +@code{STATX_WRITE_ATOMIC} flag. + +This is a Linux-specific extension. @end vtable When the source file is compiled with @code{_FILE_OFFSET_BITS == 64} the diff --git a/misc/tst-preadvwritev2-common.c b/misc/tst-preadvwritev2-common.c index 8e04ff7282..4556421a43 100644 --- a/misc/tst-preadvwritev2-common.c +++ b/misc/tst-preadvwritev2-common.c @@ -37,8 +37,11 @@ #ifndef RWF_NOAPPEND # define RWF_NOAPPEND 0 #endif +#ifndef RWF_ATOMIC +# define RWF_ATOMIC 0 +#endif #define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT \ - | RWF_APPEND | RWF_NOAPPEND) + | RWF_APPEND | RWF_NOAPPEND | RWF_ATOMIC) /* Generic uio_lim.h does not define IOV_MAX. */ #ifndef IOV_MAX diff --git a/sysdeps/unix/sysv/linux/bits/uio-ext.h b/sysdeps/unix/sysv/linux/bits/uio-ext.h index ead7a09156..85ed21bac5 100644 --- a/sysdeps/unix/sysv/linux/bits/uio-ext.h +++ b/sysdeps/unix/sysv/linux/bits/uio-ext.h @@ -48,6 +48,8 @@ extern ssize_t process_vm_writev (pid_t __pid, const struct iovec *__lvec, #define RWF_NOWAIT 0x00000008 /* per-IO nonblocking mode. */ #define RWF_APPEND 0x00000010 /* per-IO O_APPEND. */ #define RWF_NOAPPEND 0x00000020 /* per-IO negation of O_APPEND */ +#define RWF_ATOMIC 0x00000040 /* Write is to be issued with torn-write + prevention. */ __END_DECLS