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ceph: add ceph.caps vxattr

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Add a new vxattr that allows userspace to list the caps for a specific
directory or file.

[ jlayton: change format delimiter to '/' ]

Signed-off-by: Luis Henriques <lhenriques@suse.de>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Luis Henriques 2020-11-23 17:38:46 +00:00 committed by Ilya Dryomov
parent bca9fc14c7
commit dd980fc0d5
1 changed files with 27 additions and 0 deletions
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27
fs/ceph/xattr.c
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@ -321,6 +321,19 @@ static ssize_t ceph_vxattrcb_client_id(struct ceph_inode_info *ci,
ceph_client_gid(fsc->client));
}
static ssize_t ceph_vxattrcb_caps(struct ceph_inode_info *ci, char *val,
size_t size)
{
int issued;
spin_lock(&ci->i_ceph_lock);
issued = __ceph_caps_issued(ci, NULL);
spin_unlock(&ci->i_ceph_lock);
return ceph_fmt_xattr(val, size, "%s/0x%x",
ceph_cap_string(issued), issued);
}
#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
#define CEPH_XATTR_NAME2(_type, _name, _name2) \
XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
@ -396,6 +409,13 @@ static struct ceph_vxattr ceph_dir_vxattrs[] = {
.exists_cb = ceph_vxattrcb_snap_btime_exists,
.flags = VXATTR_FLAG_READONLY,
},
{
.name = "ceph.caps",
.name_size = sizeof("ceph.caps"),
.getxattr_cb = ceph_vxattrcb_caps,
.exists_cb = NULL,
.flags = VXATTR_FLAG_HIDDEN,
},
{ .name = NULL, 0 } /* Required table terminator */
};
@ -421,6 +441,13 @@ static struct ceph_vxattr ceph_file_vxattrs[] = {
.exists_cb = ceph_vxattrcb_snap_btime_exists,
.flags = VXATTR_FLAG_READONLY,
},
{
.name = "ceph.caps",
.name_size = sizeof("ceph.caps"),
.getxattr_cb = ceph_vxattrcb_caps,
.exists_cb = NULL,
.flags = VXATTR_FLAG_HIDDEN,
},
{ .name = NULL, 0 } /* Required table terminator */
};