linux-kernel - Re: [PATCH 3/3] statx: add STATX

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Date:   Thu, 18 Oct 2018 19:48:51 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Miklos Szeredi <mszeredi@...hat.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, David Howells <dhowells@...hat.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Florian Weimer <fw@...eb.enyo.de>,
        Amir Goldstein <amir73il@...il.com>
Subject: Re: [PATCH 3/3] statx: add STATX_ATTRIBUTES flag

On Oct 18, 2018, at 7:11 AM, Miklos Szeredi <mszeredi@...hat.com> wrote:
> 
> FUSE will want to know if stx_attributes is interesting or not, because
> there's a non-zero cost of retreiving it.
> 
> This is more of a "want" flag, since stx_attributes_mask already indicates
> whether we "got" stx_attributes or not.  So for now we can just deal with
> this flag in the generic code.
> 
> Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
> Cc: David Howells <dhowells@...hat.com>
> Cc: Michael Kerrisk <mtk.manpages@...il.com>

Reviewed-by: Andreas Dilger <adilger@...ger.ca>

> ---
> fs/stat.c                       | 3 +++
> include/uapi/linux/stat.h       | 1 +
> samples/statx/test-statx.c      | 2 +-
> tools/include/uapi/linux/stat.h | 1 +
> 4 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/stat.c b/fs/stat.c
> index 8d297a279991..6bf86d57e2e3 100644
> --- a/fs/stat.c
> +++ b/fs/stat.c
> @@ -535,6 +535,9 @@ cp_statx(const struct kstat *stat, struct statx __user *buffer)
> 	tmp.stx_size = stat->size;
> 	tmp.stx_blocks = stat->blocks;
> 	tmp.stx_attributes_mask = stat->attributes_mask;
> +	/* Having anything in attributes_mask means attributes are valid. */
> +	if (tmp.stx_attributes_mask)
> +		tmp.stx_mask |= STATX_ATTRIBUTES;
> 	tmp.stx_atime.tv_sec = stat->atime.tv_sec;
> 	tmp.stx_atime.tv_nsec = stat->atime.tv_nsec;
> 	tmp.stx_btime.tv_sec = stat->btime.tv_sec;
> diff --git a/include/uapi/linux/stat.h b/include/uapi/linux/stat.h
> index 370f09d92fa6..aef0aba5dfe7 100644
> --- a/include/uapi/linux/stat.h
> +++ b/include/uapi/linux/stat.h
> @@ -148,6 +148,7 @@ struct statx {
> #define STATX_BLOCKS		0x00000400U	/* Want/got stx_blocks */
> #define STATX_BASIC_STATS	0x000007ffU	/* The stuff in the normal stat struct */
> #define STATX_BTIME		0x00000800U	/* Want/got stx_btime */
> +#define STATX_ATTRIBUTES	0x00001000U	/* Want/got stx_attributes */
> 
> #define STATX__RESERVED		0x80000000U	/* Reserved for future struct statx expansion */
> 
> diff --git a/samples/statx/test-statx.c b/samples/statx/test-statx.c
> index e354048dea3c..deef9a68ff68 100644
> --- a/samples/statx/test-statx.c
> +++ b/samples/statx/test-statx.c
> @@ -211,7 +211,7 @@ int main(int argc, char **argv)
> 	struct statx stx;
> 	int ret, raw = 0, atflag = AT_SYMLINK_NOFOLLOW;
> 
> -	unsigned int mask = STATX_BASIC_STATS | STATX_BTIME;
> +	unsigned int mask = STATX_BASIC_STATS | STATX_BTIME | STATX_ATTRIBUTES;
> 
> 	for (argv++; *argv; argv++) {
> 		if (strcmp(*argv, "-F") == 0) {
> diff --git a/tools/include/uapi/linux/stat.h b/tools/include/uapi/linux/stat.h
> index 370f09d92fa6..aef0aba5dfe7 100644
> --- a/tools/include/uapi/linux/stat.h
> +++ b/tools/include/uapi/linux/stat.h
> @@ -148,6 +148,7 @@ struct statx {
> #define STATX_BLOCKS		0x00000400U	/* Want/got stx_blocks */
> #define STATX_BASIC_STATS	0x000007ffU	/* The stuff in the normal stat struct */
> #define STATX_BTIME		0x00000800U	/* Want/got stx_btime */
> +#define STATX_ATTRIBUTES	0x00001000U	/* Want/got stx_attributes */
> 
> #define STATX__RESERVED		0x80000000U	/* Reserved for future struct statx expansion */
> 
> --
> 2.14.3
> 


Cheers, Andreas






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