On Thu, Jul 21, 2016 at 2:49 PM, Venky Shankar <vshankar@xxxxxxxxxx> wrote:
> As of now listing extended attributes result in ceph dump all of
> it's internal xattrs thereby confusing tools such as rsync and the
> likes. This functionality would be removed in the subsequent patch,
> but there needs to be a way to examine ceph's internal xattr.
>
> Remembering all internal xattrs is cumbersome and error prone, so,
> we provide a virtual xattr to fetch a list of ceph's internal xattr,
> obviously excluding itself.
>
> Signed-off-by: Venky Shankar <vshankar@xxxxxxxxxx>
> ---
> fs/ceph/xattr.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 54 insertions(+)
>
> diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
> index 4870b29..d0f59cb 100644
> --- a/fs/ceph/xattr.c
> +++ b/fs/ceph/xattr.c
> @@ -204,7 +204,45 @@ static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
> (long)ci->i_rctime.tv_nsec);
> }
>
> +static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode);
> +static size_t ceph_vxattrs_name_size(struct ceph_vxattr *vxattrs);
>
> +/* list all ceph internal xattrs */
> +static size_t ceph_vxattrcb_list_all(struct ceph_inode_info *ci, char *val,
> + size_t size)
> +{
> + struct inode *inode = &ci->vfs_inode;
> + struct ceph_vxattr *vxattr;
> + struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode);
> + u32 len, namelen;
> + int err = 0;
> +
> + if (!vxattrs)
> + goto out;
> +
> + namelen = ceph_vxattrs_name_size(vxattrs);
> +
> + err = -ERANGE;
> + if (size && (namelen > size))
> + goto out;
> + err = namelen;
> + if (size == 0)
> + goto out;
> +
> + /* fill up buffer with virtual xattrs */
> + for (err = 0, vxattr = vxattrs; vxattr->name; vxattr++) {
> + if (!vxattr->hidden && !(vxattr->exists_cb
> + && !vxattr->exists_cb(ci))) {
> + len = snprintf(val + err, size - err, "%s", vxattr->name);
> + err += len + 1;
> + }
> + }
> +
> + out:
> + return err;
> +}
> +
> +#define CEPH_XATTR_LIST_INTERNAL XATTR_CEPH_PREFIX"all"
I prefer name ceph.list
> #define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
> #define CEPH_XATTR_NAME2(_type, _name, _name2) \
> XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
> @@ -237,6 +275,14 @@ static struct ceph_vxattr ceph_dir_vxattrs[] = {
> .hidden = true,
> .exists_cb = ceph_vxattrcb_layout_exists,
> },
> + {
> + .name = CEPH_XATTR_LIST_INTERNAL,
> + .name_size = sizeof(CEPH_XATTR_LIST_INTERNAL),
> + .getxattr_cb = ceph_vxattrcb_list_all,
> + .readonly = true,
> + .hidden = true,
> + .exists_cb = NULL,
> + },
> XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
> XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
> XATTR_LAYOUT_FIELD(dir, layout, object_size),
> @@ -264,6 +310,14 @@ static struct ceph_vxattr ceph_file_vxattrs[] = {
> .hidden = true,
> .exists_cb = ceph_vxattrcb_layout_exists,
> },
> + {
> + .name = CEPH_XATTR_LIST_INTERNAL,
> + .name_size = sizeof(CEPH_XATTR_LIST_INTERNAL),
> + .getxattr_cb = ceph_vxattrcb_list_all,
> + .readonly = true,
> + .hidden = true,
> + .exists_cb = NULL,
> + },
> XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
> XATTR_LAYOUT_FIELD(file, layout, stripe_count),
> XATTR_LAYOUT_FIELD(file, layout, object_size),
Need to change the 'hidden' attribute of all other vxattrs to false.
Regards
Yan, Zheng
> --
> 2.1.4
>
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