[PATCH] statx.2: document STATX_DIO_READ_ALIGN

[PATCH] statx.2: document STATX_DIO_READ_ALIGN

[Christoph Hellwig]

Document the new STATX_DIO_READ_ALIGN flag and the new
stx_dio_read_offset_align field guarded by it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 man/man2/statx.2 | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/man/man2/statx.2 b/man/man2/statx.2
index c5b5a28ec2f1..378bf363d93f 100644
--- a/man/man2/statx.2
+++ b/man/man2/statx.2
@@ -76,6 +76,9 @@ struct statx {
     __u32 stx_atomic_write_unit_min;
     __u32 stx_atomic_write_unit_max;
     __u32 stx_atomic_write_segments_max;
+
+    /* File offset alignment for direct I/O reads */
+    __u32   stx_dio_read_offset_align;
 };
 .EE
 .in
@@ -261,7 +264,7 @@ STATX_BTIME	Want stx_btime
 STATX_ALL	The same as STATX_BASIC_STATS | STATX_BTIME.
 	It is deprecated and should not be used.
 STATX_MNT_ID	Want stx_mnt_id (since Linux 5.8)
-STATX_DIOALIGN	Want stx_dio_mem_align and stx_dio_offset_align
+STATX_DIOALIGN	Want stx_dio_mem_align and stx_dio_offset_align.
 	(since Linux 6.1; support varies by filesystem)
 STATX_MNT_ID_UNIQUE	Want unique stx_mnt_id (since Linux 6.8)
 STATX_SUBVOL	Want stx_subvol
@@ -270,6 +273,8 @@ STATX_WRITE_ATOMIC	Want stx_atomic_write_unit_min,
 	stx_atomic_write_unit_max,
 	and stx_atomic_write_segments_max.
 	(since Linux 6.11; support varies by filesystem)
+STATX_DIO_READ_ALIGN	Want stx_dio_read_offset_align.
+	(since Linux 6.14; support varies by filesystem)
 .TE
 .in
 .P
@@ -467,6 +472,26 @@ This will only be nonzero if
 .I stx_dio_mem_align
 is nonzero, and vice versa.
 .TP
+.I stx_dio_read_offset_align
+The alignment (in bytes) required for file offsets and I/O segment lengths for
+direct I/O reads
+.RB ( O_DIRECT )
+on this file.  If zero the limit in
+.I
+stx_dio_offset_align
+applies for reads as well.  If non-zero this value must be
+smaller than
+.I
+stx_dio_offset_align
+which must be provided by the file system.
+This value does not affect the memory alignent in
+.I stx_dio_mem_align .
+.IP
+.B STATX_DIO_READ_ALIGN
+.I ( stx_dio_offset_align )
+support by filesystem;
+it is supported by xfs since Linux 6.14.
+.TP
 .I stx_subvol
 Subvolume number of the current file.
 .IP
-- 
2.45.2

Re: [PATCH] statx.2: document STATX_DIO_READ_ALIGN

[Darrick J. Wong]

On Mon, Jan 06, 2025 at 04:19:38PM +0100, Christoph Hellwig wrote:
> Document the new STATX_DIO_READ_ALIGN flag and the new
> stx_dio_read_offset_align field guarded by it.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  man/man2/statx.2 | 27 ++++++++++++++++++++++++++-
>  1 file changed, 26 insertions(+), 1 deletion(-)
> 
> diff --git a/man/man2/statx.2 b/man/man2/statx.2
> index c5b5a28ec2f1..378bf363d93f 100644
> --- a/man/man2/statx.2
> +++ b/man/man2/statx.2
> @@ -76,6 +76,9 @@ struct statx {
>      __u32 stx_atomic_write_unit_min;
>      __u32 stx_atomic_write_unit_max;
>      __u32 stx_atomic_write_segments_max;
> +
> +    /* File offset alignment for direct I/O reads */
> +    __u32   stx_dio_read_offset_align;
>  };
>  .EE
>  .in
> @@ -261,7 +264,7 @@ STATX_BTIME	Want stx_btime
>  STATX_ALL	The same as STATX_BASIC_STATS | STATX_BTIME.
>  	It is deprecated and should not be used.
>  STATX_MNT_ID	Want stx_mnt_id (since Linux 5.8)
> -STATX_DIOALIGN	Want stx_dio_mem_align and stx_dio_offset_align
> +STATX_DIOALIGN	Want stx_dio_mem_align and stx_dio_offset_align.
>  	(since Linux 6.1; support varies by filesystem)
>  STATX_MNT_ID_UNIQUE	Want unique stx_mnt_id (since Linux 6.8)
>  STATX_SUBVOL	Want stx_subvol
> @@ -270,6 +273,8 @@ STATX_WRITE_ATOMIC	Want stx_atomic_write_unit_min,
>  	stx_atomic_write_unit_max,
>  	and stx_atomic_write_segments_max.
>  	(since Linux 6.11; support varies by filesystem)
> +STATX_DIO_READ_ALIGN	Want stx_dio_read_offset_align.
> +	(since Linux 6.14; support varies by filesystem)
>  .TE
>  .in
>  .P
> @@ -467,6 +472,26 @@ This will only be nonzero if
>  .I stx_dio_mem_align
>  is nonzero, and vice versa.
>  .TP
> +.I stx_dio_read_offset_align
> +The alignment (in bytes) required for file offsets and I/O segment lengths for
> +direct I/O reads
> +.RB ( O_DIRECT )
> +on this file.  If zero the limit in

manpage nit: new sentences should start on a new line.

> +.I
> +stx_dio_offset_align
> +applies for reads as well.  If non-zero this value must be

Here too.

> +smaller than
> +.I
> +stx_dio_offset_align
> +which must be provided by the file system.

I can't imagine a filesystem where dio_read_offset > dio_offset makes
sense, but why do we need to put that in the manpage?

vs. "If non-zero, the filesystem must also provide stx_dio_offset_align."

> +This value does not affect the memory alignent in

                                         alignment

> +.I stx_dio_mem_align .
> +.IP
> +.B STATX_DIO_READ_ALIGN
> +.I ( stx_dio_offset_align )
> +support by filesystem;
> +it is supported by xfs since Linux 6.14.

Aside from those bits, this looks good to me.

--D

> +.TP
>  .I stx_subvol
>  Subvolume number of the current file.
>  .IP
> -- 
> 2.45.2
> 
> 

Re: [PATCH] statx.2: document STATX_DIO_READ_ALIGN

[Christoph Hellwig]

On Mon, Jan 06, 2025 at 09:40:07AM -0800, Darrick J. Wong wrote:
> > +stx_dio_offset_align
> > +which must be provided by the file system.
> 
> I can't imagine a filesystem where dio_read_offset > dio_offset makes
> sense, but why do we need to put that in the manpage?

Well, to be backwards compatible to older userspace the value put into
stx_dio_offset_align also needs to work for reads.  Given that there
were questions about this in the RFC round I thought I'd mention it.

Re: [PATCH] statx.2: document STATX_DIO_READ_ALIGN

[Darrick J. Wong]

On Mon, Jan 06, 2025 at 07:09:58PM +0100, Christoph Hellwig wrote:
> On Mon, Jan 06, 2025 at 09:40:07AM -0800, Darrick J. Wong wrote:
> > > +stx_dio_offset_align
> > > +which must be provided by the file system.
> > 
> > I can't imagine a filesystem where dio_read_offset > dio_offset makes
> > sense, but why do we need to put that in the manpage?
> 
> Well, to be backwards compatible to older userspace the value put into
> stx_dio_offset_align also needs to work for reads.  Given that there
> were questions about this in the RFC round I thought I'd mention it.

Ah ok then. :)

With the other formatting nits fixed,
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

--D

Re: [PATCH] statx.2: document STATX_DIO_READ_ALIGN

[Alejandro Colomar]

[-- Attachment #1: Type: text/plain, Size: 3375 bytes --]

Hi Christoph,

On Mon, Jan 06, 2025 at 04:19:38PM +0100, Christoph Hellwig wrote:
> Document the new STATX_DIO_READ_ALIGN flag and the new
> stx_dio_read_offset_align field guarded by it.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Thanks for the patch!  Please see some minor comments below.

Have a lovely night!
Alex

> ---
>  man/man2/statx.2 | 27 ++++++++++++++++++++++++++-
>  1 file changed, 26 insertions(+), 1 deletion(-)
> 
> diff --git a/man/man2/statx.2 b/man/man2/statx.2
> index c5b5a28ec2f1..378bf363d93f 100644
> --- a/man/man2/statx.2
> +++ b/man/man2/statx.2
> @@ -76,6 +76,9 @@ struct statx {
>      __u32 stx_atomic_write_unit_min;
>      __u32 stx_atomic_write_unit_max;
>      __u32 stx_atomic_write_segments_max;
> +
> +    /* File offset alignment for direct I/O reads */
> +    __u32   stx_dio_read_offset_align;
>  };
>  .EE
>  .in
> @@ -261,7 +264,7 @@ STATX_BTIME	Want stx_btime
>  STATX_ALL	The same as STATX_BASIC_STATS | STATX_BTIME.
>  	It is deprecated and should not be used.
>  STATX_MNT_ID	Want stx_mnt_id (since Linux 5.8)
> -STATX_DIOALIGN	Want stx_dio_mem_align and stx_dio_offset_align
> +STATX_DIOALIGN	Want stx_dio_mem_align and stx_dio_offset_align.
>  	(since Linux 6.1; support varies by filesystem)
>  STATX_MNT_ID_UNIQUE	Want unique stx_mnt_id (since Linux 6.8)
>  STATX_SUBVOL	Want stx_subvol
> @@ -270,6 +273,8 @@ STATX_WRITE_ATOMIC	Want stx_atomic_write_unit_min,
>  	stx_atomic_write_unit_max,
>  	and stx_atomic_write_segments_max.
>  	(since Linux 6.11; support varies by filesystem)
> +STATX_DIO_READ_ALIGN	Want stx_dio_read_offset_align.
> +	(since Linux 6.14; support varies by filesystem)
>  .TE
>  .in
>  .P
> @@ -467,6 +472,26 @@ This will only be nonzero if
>  .I stx_dio_mem_align
>  is nonzero, and vice versa.
>  .TP
> +.I stx_dio_read_offset_align
> +The alignment (in bytes) required for file offsets and I/O segment lengths for
> +direct I/O reads
> +.RB ( O_DIRECT )
> +on this file.  If zero the limit in

Please write poems, not prose.  :)

In other words, new sentence, new line.  See man-pages(7).

$ MANWIDTH=72 man man-pages | sed -n '/Use semantic newlines/,/^$/p'
   Use semantic newlines
     In the source of a manual page, new sentences should be started on
     new lines, long sentences should be split  into  lines  at  clause
     breaks  (commas,  semicolons, colons, and so on), and long clauses
     should be split at phrase boundaries.  This convention,  sometimes
     known as "semantic newlines", makes it easier to see the effect of
     patches, which often operate at the level of individual sentences,
     clauses, or phrases.

> +.I
> +stx_dio_offset_align

We put the italics word in the same line as the .I.

> +applies for reads as well.  If non-zero this value must be
> +smaller than
> +.I
> +stx_dio_offset_align
> +which must be provided by the file system.
> +This value does not affect the memory alignent in
> +.I stx_dio_mem_align .
> +.IP
> +.B STATX_DIO_READ_ALIGN
> +.I ( stx_dio_offset_align )

You probably meant .RI (roman-italics alternating).

> +support by filesystem;
> +it is supported by xfs since Linux 6.14.
> +.TP
>  .I stx_subvol
>  Subvolume number of the current file.
>  .IP
> -- 
> 2.45.2
> 
> 

-- 
<https://www.alejandro-colomar.es/>

[-- Attachment #2: signature.asc --]
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[PATCH] statx.2: document STATX_DIO_READ_ALIGN

[Christoph Hellwig]

Document the new STATX_DIO_READ_ALIGN flag and the new
stx_dio_read_offset_align field guarded by it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 man/man2/statx.2 | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/man/man2/statx.2 b/man/man2/statx.2
index c5b5a28ec2f1..8ef6a1cfb1c0 100644
--- a/man/man2/statx.2
+++ b/man/man2/statx.2
@@ -76,6 +76,9 @@ struct statx {
     __u32 stx_atomic_write_unit_min;
     __u32 stx_atomic_write_unit_max;
     __u32 stx_atomic_write_segments_max;
+
+    /* File offset alignment for direct I/O reads */
+    __u32   stx_dio_read_offset_align;
 };
 .EE
 .in
@@ -261,7 +264,7 @@ STATX_BTIME	Want stx_btime
 STATX_ALL	The same as STATX_BASIC_STATS | STATX_BTIME.
 	It is deprecated and should not be used.
 STATX_MNT_ID	Want stx_mnt_id (since Linux 5.8)
-STATX_DIOALIGN	Want stx_dio_mem_align and stx_dio_offset_align
+STATX_DIOALIGN	Want stx_dio_mem_align and stx_dio_offset_align.
 	(since Linux 6.1; support varies by filesystem)
 STATX_MNT_ID_UNIQUE	Want unique stx_mnt_id (since Linux 6.8)
 STATX_SUBVOL	Want stx_subvol
@@ -270,6 +273,8 @@ STATX_WRITE_ATOMIC	Want stx_atomic_write_unit_min,
 	stx_atomic_write_unit_max,
 	and stx_atomic_write_segments_max.
 	(since Linux 6.11; support varies by filesystem)
+STATX_DIO_READ_ALIGN	Want stx_dio_read_offset_align.
+	(since Linux 6.14; support varies by filesystem)
 .TE
 .in
 .P
@@ -467,6 +472,25 @@ This will only be nonzero if
 .I stx_dio_mem_align
 is nonzero, and vice versa.
 .TP
+.I stx_dio_read_offset_align
+The alignment (in bytes) required for file offsets and I/O segment lengths for
+direct I/O reads
+.RB ( O_DIRECT )
+on this file.
+If zero the limit in
+.I stx_dio_offset_align
+applies for reads as well.
+If non-zero this value must be smaller than
+.I stx_dio_offset_align
+which must be provided by the file system.
+The memory alignment in
+.I stx_dio_mem_align
+is not affected by this value.
+.IP
+.B STATX_DIO_READ_ALIGN
+.RI ( stx_dio_offset_align )
+is supported by xfs on regular files since Linux 6.14.
+.TP
 .I stx_subvol
 Subvolume number of the current file.
 .IP
-- 
2.45.2

Re: [PATCH] statx.2: document STATX_DIO_READ_ALIGN

[Darrick J. Wong]

On Wed, Jan 08, 2025 at 09:59:00AM +0100, Christoph Hellwig wrote:
> Document the new STATX_DIO_READ_ALIGN flag and the new
> stx_dio_read_offset_align field guarded by it.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  man/man2/statx.2 | 26 +++++++++++++++++++++++++-
>  1 file changed, 25 insertions(+), 1 deletion(-)
> 
> diff --git a/man/man2/statx.2 b/man/man2/statx.2
> index c5b5a28ec2f1..8ef6a1cfb1c0 100644
> --- a/man/man2/statx.2
> +++ b/man/man2/statx.2
> @@ -76,6 +76,9 @@ struct statx {
>      __u32 stx_atomic_write_unit_min;
>      __u32 stx_atomic_write_unit_max;
>      __u32 stx_atomic_write_segments_max;
> +
> +    /* File offset alignment for direct I/O reads */
> +    __u32   stx_dio_read_offset_align;
>  };
>  .EE
>  .in
> @@ -261,7 +264,7 @@ STATX_BTIME	Want stx_btime
>  STATX_ALL	The same as STATX_BASIC_STATS | STATX_BTIME.
>  	It is deprecated and should not be used.
>  STATX_MNT_ID	Want stx_mnt_id (since Linux 5.8)
> -STATX_DIOALIGN	Want stx_dio_mem_align and stx_dio_offset_align
> +STATX_DIOALIGN	Want stx_dio_mem_align and stx_dio_offset_align.
>  	(since Linux 6.1; support varies by filesystem)
>  STATX_MNT_ID_UNIQUE	Want unique stx_mnt_id (since Linux 6.8)
>  STATX_SUBVOL	Want stx_subvol
> @@ -270,6 +273,8 @@ STATX_WRITE_ATOMIC	Want stx_atomic_write_unit_min,
>  	stx_atomic_write_unit_max,
>  	and stx_atomic_write_segments_max.
>  	(since Linux 6.11; support varies by filesystem)
> +STATX_DIO_READ_ALIGN	Want stx_dio_read_offset_align.
> +	(since Linux 6.14; support varies by filesystem)
>  .TE
>  .in
>  .P
> @@ -467,6 +472,25 @@ This will only be nonzero if
>  .I stx_dio_mem_align
>  is nonzero, and vice versa.
>  .TP
> +.I stx_dio_read_offset_align
> +The alignment (in bytes) required for file offsets and I/O segment lengths for
> +direct I/O reads
> +.RB ( O_DIRECT )
> +on this file.
> +If zero the limit in

nit: add a comma here (really a dependent clause) to make it clearer
that 'zero' isn't being used as a verb here:

"If zero, the limit in..."

> +.I stx_dio_offset_align
> +applies for reads as well.
> +If non-zero this value must be smaller than

Same here.

"If non-zero, this value..."

With that fixed,
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

--D

> +.I stx_dio_offset_align
> +which must be provided by the file system.
> +The memory alignment in
> +.I stx_dio_mem_align
> +is not affected by this value.
> +.IP
> +.B STATX_DIO_READ_ALIGN
> +.RI ( stx_dio_offset_align )
> +is supported by xfs on regular files since Linux 6.14.
> +.TP
>  .I stx_subvol
>  Subvolume number of the current file.
>  .IP
> -- 
> 2.45.2
> 
> 

[PATCH] statx.2: document STATX_DIO_READ_ALIGN

[Christoph Hellwig]

Document the new STATX_DIO_READ_ALIGN flag and the new
stx_dio_read_offset_align field guarded by it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
---
 man/man2/statx.2 | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/man/man2/statx.2 b/man/man2/statx.2
index c5b5a28ec2f1..7ad9c219a51d 100644
--- a/man/man2/statx.2
+++ b/man/man2/statx.2
@@ -76,6 +76,9 @@ struct statx {
     __u32 stx_atomic_write_unit_min;
     __u32 stx_atomic_write_unit_max;
     __u32 stx_atomic_write_segments_max;
+
+    /* File offset alignment for direct I/O reads */
+    __u32   stx_dio_read_offset_align;
 };
 .EE
 .in
@@ -261,7 +264,7 @@ STATX_BTIME	Want stx_btime
 STATX_ALL	The same as STATX_BASIC_STATS | STATX_BTIME.
 	It is deprecated and should not be used.
 STATX_MNT_ID	Want stx_mnt_id (since Linux 5.8)
-STATX_DIOALIGN	Want stx_dio_mem_align and stx_dio_offset_align
+STATX_DIOALIGN	Want stx_dio_mem_align and stx_dio_offset_align.
 	(since Linux 6.1; support varies by filesystem)
 STATX_MNT_ID_UNIQUE	Want unique stx_mnt_id (since Linux 6.8)
 STATX_SUBVOL	Want stx_subvol
@@ -270,6 +273,8 @@ STATX_WRITE_ATOMIC	Want stx_atomic_write_unit_min,
 	stx_atomic_write_unit_max,
 	and stx_atomic_write_segments_max.
 	(since Linux 6.11; support varies by filesystem)
+STATX_DIO_READ_ALIGN	Want stx_dio_read_offset_align.
+	(since Linux 6.14; support varies by filesystem)
 .TE
 .in
 .P
@@ -467,6 +472,25 @@ This will only be nonzero if
 .I stx_dio_mem_align
 is nonzero, and vice versa.
 .TP
+.I stx_dio_read_offset_align
+The alignment (in bytes) required for file offsets and I/O segment lengths for
+direct I/O reads
+.RB ( O_DIRECT )
+on this file.
+If zero, the limit in
+.I stx_dio_offset_align
+applies for reads as well.
+If non-zero, this value must be smaller than or equal to
+.I stx_dio_offset_align
+which must be provided by the file system if requested by the application.
+The memory alignment in
+.I stx_dio_mem_align
+is not affected by this value.
+.IP
+.B STATX_DIO_READ_ALIGN
+.RI ( stx_dio_offset_align )
+is supported by xfs on regular files since Linux 6.14.
+.TP
 .I stx_subvol
 Subvolume number of the current file.
 .IP
-- 
2.45.2

Re: [PATCH] statx.2: document STATX_DIO_READ_ALIGN

[Alejandro Colomar]

[-- Attachment #1: Type: text/plain, Size: 3361 bytes --]

Hi Christoph,

On Thu, Jan 09, 2025 at 09:32:26AM +0100, Christoph Hellwig wrote:
> Document the new STATX_DIO_READ_ALIGN flag and the new
> stx_dio_read_offset_align field guarded by it.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

Thanks for the patch!  I've applied it.
<https://www.alejandro-colomar.es/src/alx/linux/man-pages/man-pages.git/commit/?h=contrib&id=3eb8ef31cb5295b5eaaaf319796ea6279b7f7002>

A few minor comments:

Please add the CCd people as Cc: in the commit message.  I'll do that
anyway, so it avoids me pasting them, and will probably make it easier
for you to send with git-send-email(1) (or whatever you use).

> Subject: Re: [PATCH] statx.2: document STATX_DIO_READ_ALIGN

I changed commit subjects to use the full path to the manual page.
Also please start with uppercase after the ':'.

Also, please use version numbers for patches (v2, v3, ...).

> ---
>  man/man2/statx.2 | 26 +++++++++++++++++++++++++-
>  1 file changed, 25 insertions(+), 1 deletion(-)
> 
> diff --git a/man/man2/statx.2 b/man/man2/statx.2
> index c5b5a28ec2f1..7ad9c219a51d 100644
> --- a/man/man2/statx.2
> +++ b/man/man2/statx.2
> @@ -76,6 +76,9 @@ struct statx {
>      __u32 stx_atomic_write_unit_min;
>      __u32 stx_atomic_write_unit_max;
>      __u32 stx_atomic_write_segments_max;
> +

I didn't realize this needed a \&.  The CI reminded me.  I've amended
that.


Have a lovely day!
Alex

> +    /* File offset alignment for direct I/O reads */
> +    __u32   stx_dio_read_offset_align;
>  };
>  .EE
>  .in
> @@ -261,7 +264,7 @@ STATX_BTIME	Want stx_btime
>  STATX_ALL	The same as STATX_BASIC_STATS | STATX_BTIME.
>  	It is deprecated and should not be used.
>  STATX_MNT_ID	Want stx_mnt_id (since Linux 5.8)
> -STATX_DIOALIGN	Want stx_dio_mem_align and stx_dio_offset_align
> +STATX_DIOALIGN	Want stx_dio_mem_align and stx_dio_offset_align.
>  	(since Linux 6.1; support varies by filesystem)
>  STATX_MNT_ID_UNIQUE	Want unique stx_mnt_id (since Linux 6.8)
>  STATX_SUBVOL	Want stx_subvol
> @@ -270,6 +273,8 @@ STATX_WRITE_ATOMIC	Want stx_atomic_write_unit_min,
>  	stx_atomic_write_unit_max,
>  	and stx_atomic_write_segments_max.
>  	(since Linux 6.11; support varies by filesystem)
> +STATX_DIO_READ_ALIGN	Want stx_dio_read_offset_align.
> +	(since Linux 6.14; support varies by filesystem)
>  .TE
>  .in
>  .P
> @@ -467,6 +472,25 @@ This will only be nonzero if
>  .I stx_dio_mem_align
>  is nonzero, and vice versa.
>  .TP
> +.I stx_dio_read_offset_align
> +The alignment (in bytes) required for file offsets and I/O segment lengths for
> +direct I/O reads
> +.RB ( O_DIRECT )
> +on this file.
> +If zero, the limit in
> +.I stx_dio_offset_align
> +applies for reads as well.
> +If non-zero, this value must be smaller than or equal to
> +.I stx_dio_offset_align
> +which must be provided by the file system if requested by the application.
> +The memory alignment in
> +.I stx_dio_mem_align
> +is not affected by this value.
> +.IP
> +.B STATX_DIO_READ_ALIGN
> +.RI ( stx_dio_offset_align )
> +is supported by xfs on regular files since Linux 6.14.
> +.TP
>  .I stx_subvol
>  Subvolume number of the current file.
>  .IP
> -- 
> 2.45.2
> 
> 

-- 
<https://www.alejandro-colomar.es/>

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