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misc: Add support for Linux uio.h RWF_NOAPPEND flag

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In Linux 6.9 a new flag is added to allow for Per-io operations to
disable append mode even if a file was opened with the flag O_APPEND.
This is done with the new RWF_NOAPPEND flag.

This caused two test failures as these tests expected the flag 0x00000020
to be unused.  Adding the flag definition now fixes these tests on Linux
6.9 (v6.9-rc1).

  FAIL: misc/tst-preadvwritev2
  FAIL: misc/tst-preadvwritev64v2

This patch adds the flag, adjusts the test and adds details to
documentation.

Link: https://lore.kernel.org/all/20200831153207.GO3265@brightrain.aerifal.cx/
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Stafford Horne 2024-04-03 06:40:37 +01:00
parent 95c70fd0d4
commit 3db9d208dd
3 changed files with 9 additions and 1 deletions
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4
manual/llio.texi
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@ -1339,6 +1339,10 @@ will fail and set @code{errno} to @code{EAGAIN} if the operation would block.
@item RWF_APPEND @item RWF_APPEND
Per-IO synchronization as if the file was opened with @code{O_APPEND} flag. 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.
@end vtable @end vtable
When the source file is compiled with @code{_FILE_OFFSET_BITS == 64} the When the source file is compiled with @code{_FILE_OFFSET_BITS == 64} the

5
misc/tst-preadvwritev2-common.c
View File

@ -34,8 +34,11 @@
#ifndef RWF_APPEND #ifndef RWF_APPEND
# define RWF_APPEND 0 # define RWF_APPEND 0
#endif #endif
#ifndef RWF_NOAPPEND
# define RWF_NOAPPEND 0
#endif
#define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT \ #define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT \
| RWF_APPEND) | RWF_APPEND | RWF_NOAPPEND)
/* Generic uio_lim.h does not define IOV_MAX. */ /* Generic uio_lim.h does not define IOV_MAX. */
#ifndef IOV_MAX #ifndef IOV_MAX

1
sysdeps/unix/sysv/linux/bits/uio-ext.h
View File

@ -47,6 +47,7 @@ extern ssize_t process_vm_writev (pid_t __pid, const struct iovec *__lvec,
#define RWF_SYNC 0x00000004 /* per-IO O_SYNC. */ #define RWF_SYNC 0x00000004 /* per-IO O_SYNC. */
#define RWF_NOWAIT 0x00000008 /* per-IO nonblocking mode. */ #define RWF_NOWAIT 0x00000008 /* per-IO nonblocking mode. */
#define RWF_APPEND 0x00000010 /* per-IO O_APPEND. */ #define RWF_APPEND 0x00000010 /* per-IO O_APPEND. */
#define RWF_NOAPPEND 0x00000020 /* per-IO negation of O_APPEND */
__END_DECLS __END_DECLS