linux-kernel - Re: [PATCH 2/3] tools headers UAPI: Sync linux/fs.h with the kernel sources

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Message-ID: <1d9f9bab-6e0a-4b30-82b3-774bd0d9465c@lucifer.local>
Date: Mon, 31 Mar 2025 12:27:05 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Andrei Vagin <avagin@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-doc@...r.kernel.org, David Hildenbrand <david@...hat.com>,
        Shuah Khan <shuah@...nel.org>, Jonathan Corbet <corbet@....net>,
        criu@...ts.linux.dev, Andrei Vagin <avagin@...il.com>
Subject: Re: [PATCH 2/3] tools headers UAPI: Sync linux/fs.h with the kernel
 sources

On Mon, Mar 24, 2025 at 06:53:27AM +0000, Andrei Vagin wrote:
> From: Andrei Vagin <avagin@...il.com>
>
> Required for a new PAGEMAP_SCAN test to verify guard region reporting.
>
> Signed-off-by: Andrei Vagin <avagin@...il.com>

Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>

> ---
>  tools/include/uapi/linux/fs.h | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/tools/include/uapi/linux/fs.h b/tools/include/uapi/linux/fs.h
> index 8a27bc5c7a7f..24ddf7bc4f25 100644
> --- a/tools/include/uapi/linux/fs.h
> +++ b/tools/include/uapi/linux/fs.h
> @@ -40,6 +40,15 @@
>  #define BLOCK_SIZE_BITS 10
>  #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
>
> +/* flags for integrity meta */
> +#define IO_INTEGRITY_CHK_GUARD		(1U << 0) /* enforce guard check */
> +#define IO_INTEGRITY_CHK_REFTAG		(1U << 1) /* enforce ref check */
> +#define IO_INTEGRITY_CHK_APPTAG		(1U << 2) /* enforce app check */
> +
> +#define IO_INTEGRITY_VALID_FLAGS (IO_INTEGRITY_CHK_GUARD | \
> +				  IO_INTEGRITY_CHK_REFTAG | \
> +				  IO_INTEGRITY_CHK_APPTAG)
> +
>  #define SEEK_SET	0	/* seek relative to beginning of file */
>  #define SEEK_CUR	1	/* seek relative to current file position */
>  #define SEEK_END	2	/* seek relative to end of file */
> @@ -329,9 +338,16 @@ typedef int __bitwise __kernel_rwf_t;
>  /* per-IO negation of O_APPEND */
>  #define RWF_NOAPPEND	((__force __kernel_rwf_t)0x00000020)
>
> +/* Atomic Write */
> +#define RWF_ATOMIC	((__force __kernel_rwf_t)0x00000040)
> +
> +/* buffered IO that drops the cache after reading or writing data */
> +#define RWF_DONTCACHE	((__force __kernel_rwf_t)0x00000080)
> +
>  /* mask of flags supported by the kernel */
>  #define RWF_SUPPORTED	(RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT |\
> -			 RWF_APPEND | RWF_NOAPPEND)
> +			 RWF_APPEND | RWF_NOAPPEND | RWF_ATOMIC |\
> +			 RWF_DONTCACHE)
>
>  #define PROCFS_IOCTL_MAGIC 'f'
>
> @@ -347,6 +363,7 @@ typedef int __bitwise __kernel_rwf_t;
>  #define PAGE_IS_PFNZERO		(1 << 5)
>  #define PAGE_IS_HUGE		(1 << 6)
>  #define PAGE_IS_SOFT_DIRTY	(1 << 7)
> +#define PAGE_IS_GUARD		(1 << 8)
>
>  /*
>   * struct page_region - Page region with flags
> --
> 2.49.0.395.g12beb8f557-goog
>