On Oct 18, 2018, at 7:11 AM, Miklos Szeredi <mszeredi@xxxxxxxxxx> 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@xxxxxxxxxx>
> Cc: David Howells <dhowells@xxxxxxxxxx>
> Cc: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
Reviewed-by: Andreas Dilger <adilger@xxxxxxxxx>
> ---
> 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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