Re: [RFC PATCH] ceph: acquire Fs caps when getting dir stats

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On Tue, Nov 3, 2020 at 11:11 AM Jeff Layton <jlayton@xxxxxxxxxx> wrote:
>
> We only update the inode's dirstats when we have Fs caps from the MDS.
>
> Declare a new VXATTR_FLAG_DIRSTAT that we set on all dirstats, and have
> the vxattr handling code acquire Fs caps when it's set.
>
> URL: https://tracker.ceph.com/issues/48104
> Reported-by: Patrick Donnelly <pdonnell@xxxxxxxxxx>
> Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
> ---
>  fs/ceph/xattr.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
> index 197cb1234341..0fd05d3d4399 100644
> --- a/fs/ceph/xattr.c
> +++ b/fs/ceph/xattr.c
> @@ -42,6 +42,7 @@ struct ceph_vxattr {
>  #define VXATTR_FLAG_READONLY           (1<<0)
>  #define VXATTR_FLAG_HIDDEN             (1<<1)
>  #define VXATTR_FLAG_RSTAT              (1<<2)
> +#define VXATTR_FLAG_DIRSTAT            (1<<3)
>
>  /* layouts */
>
> @@ -347,9 +348,9 @@ static struct ceph_vxattr ceph_dir_vxattrs[] = {
>         XATTR_LAYOUT_FIELD(dir, layout, object_size),
>         XATTR_LAYOUT_FIELD(dir, layout, pool),
>         XATTR_LAYOUT_FIELD(dir, layout, pool_namespace),
> -       XATTR_NAME_CEPH(dir, entries, 0),
> -       XATTR_NAME_CEPH(dir, files, 0),
> -       XATTR_NAME_CEPH(dir, subdirs, 0),
> +       XATTR_NAME_CEPH(dir, entries, VXATTR_FLAG_DIRSTAT),
> +       XATTR_NAME_CEPH(dir, files, VXATTR_FLAG_DIRSTAT),
> +       XATTR_NAME_CEPH(dir, subdirs, VXATTR_FLAG_DIRSTAT),
>         XATTR_RSTAT_FIELD(dir, rentries),
>         XATTR_RSTAT_FIELD(dir, rfiles),
>         XATTR_RSTAT_FIELD(dir, rsubdirs),
> @@ -837,6 +838,8 @@ ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
>                 int mask = 0;
>                 if (vxattr->flags & VXATTR_FLAG_RSTAT)
>                         mask |= CEPH_STAT_RSTAT;
> +               if (vxattr->flags & VXATTR_FLAG_DIRSTAT)
> +                       mask |= CEPH_CAP_FILE_SHARED;
>                 err = ceph_do_getattr(inode, mask, true);
>                 if (err)
>                         return err;

Reviewed-by: Patrick Donnelly <pdonnell@xxxxxxxxxx>


-- 
Patrick Donnelly, Ph.D.
He / Him / His
Principal Software Engineer
Red Hat Sunnyvale, CA
GPG: 19F28A586F808C2402351B93C3301A3E258DD79D




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