/**
* nfsacl_encode - Encode an NFSv3 ACL
*
* @buf: destination xdr_buf to contain XDR encoded ACL
* @base: byte offset in xdr_buf where XDR'd ACL begins
* @inode: inode of file whose ACL this is
* @acl: posix_acl to encode
* @encode_entries: whether to encode ACEs as well
* @typeflag: ACL type: NFS_ACL_DEFAULT or zero
*
* Returns size of encoded ACL in bytes or a negative errno value.
*/
int nfsacl_encode(struct xdr_buf *buf, unsigned int base, struct inode *inode,
struct posix_acl *acl, int encode_entries, int typeflag)
{
int entries = (acl && acl->a_count) ? max_t(int, acl->a_count, 4) : 0;
struct nfsacl_encode_desc nfsacl_desc = {
.desc = {
.elem_size = 12,
.array_len = encode_entries ? entries : 0,
.xcode = xdr_nfsace_encode,
},
.acl = acl,
.typeflag = typeflag,
.uid = inode->i_uid,
.gid = inode->i_gid,
};
struct nfsacl_simple_acl aclbuf;
int err;
if (entries > NFS_ACL_MAX_ENTRIES ||
xdr_encode_word(buf, base, entries))
return -EINVAL;
if (encode_entries && acl && acl->a_count == 3) {
struct posix_acl *acl2 = &aclbuf.acl;
/* Avoid the use of posix_acl_alloc(). nfsacl_encode() is
* invoked in contexts where a memory allocation failure is
* fatal. Fortunately this fake ACL is small enough to
* construct on the stack. */
posix_acl_init(acl2, 4);
/* Insert entries in canonical order: other orders seem
to confuse Solaris VxFS. */
acl2->a_entries[0] = acl->a_entries[0]; /* ACL_USER_OBJ */
acl2->a_entries[1] = acl->a_entries[1]; /* ACL_GROUP_OBJ */
acl2->a_entries[2] = acl->a_entries[1]; /* ACL_MASK */
acl2->a_entries[2].e_tag = ACL_MASK;
acl2->a_entries[3] = acl->a_entries[2]; /* ACL_OTHER */
nfsacl_desc.acl = acl2;
}
err = xdr_encode_array2(buf, base + 4, &nfsacl_desc.desc);
if (!err)
err = 8 + nfsacl_desc.desc.elem_size *
nfsacl_desc.desc.array_len;
return err;
}
unsigned int
nfsacl_encode(struct xdr_buf *buf, unsigned int base, struct inode *inode,
struct posix_acl *acl, int encode_entries, int typeflag)
{
int entries = (acl && acl->a_count) ? max_t(int, acl->a_count, 4) : 0;
struct nfsacl_encode_desc nfsacl_desc = {
.desc = {
.elem_size = 12,
.array_len = encode_entries ? entries : 0,
.xcode = xdr_nfsace_encode,
},
.acl = acl,
.typeflag = typeflag,
.uid = inode->i_uid,
.gid = inode->i_gid,
};
int err;
struct posix_acl *acl2 = NULL;
if (entries > NFS_ACL_MAX_ENTRIES ||
xdr_encode_word(buf, base, entries))
return -EINVAL;
if (encode_entries && acl && acl->a_count == 3) {
/* Fake up an ACL_MASK entry. */
acl2 = posix_acl_alloc(4, GFP_KERNEL);
if (!acl2)
return -ENOMEM;
/* Insert entries in canonical order: other orders seem
to confuse Solaris VxFS. */
acl2->a_entries[0] = acl->a_entries[0]; /* ACL_USER_OBJ */
acl2->a_entries[1] = acl->a_entries[1]; /* ACL_GROUP_OBJ */
acl2->a_entries[2] = acl->a_entries[1]; /* ACL_MASK */
acl2->a_entries[2].e_tag = ACL_MASK;
acl2->a_entries[3] = acl->a_entries[2]; /* ACL_OTHER */
nfsacl_desc.acl = acl2;
}
err = xdr_encode_array2(buf, base + 4, &nfsacl_desc.desc);
if (acl2)
posix_acl_release(acl2);
if (!err)
err = 8 + nfsacl_desc.desc.elem_size *
nfsacl_desc.desc.array_len;
return err;
}
int nfsacl_encode(struct xdr_buf *buf, unsigned int base, struct inode *inode,
struct posix_acl *acl, int encode_entries, int typeflag)
{
int entries = (acl && acl->a_count) ? max_t(int, acl->a_count, 4) : 0;
struct nfsacl_encode_desc nfsacl_desc = {
.desc = {
.elem_size = 12,
.array_len = encode_entries ? entries : 0,
.xcode = xdr_nfsace_encode,
},
.acl = acl,
.typeflag = typeflag,
.uid = inode->i_uid,
.gid = inode->i_gid,
};
struct nfsacl_simple_acl aclbuf;
int err;
if (entries > NFS_ACL_MAX_ENTRIES ||
xdr_encode_word(buf, base, entries))
return -EINVAL;
if (encode_entries && acl && acl->a_count == 3) {
struct posix_acl *acl2 = &aclbuf.acl;
posix_acl_init(acl2, 4);
acl2->a_entries[0] = acl->a_entries[0];
acl2->a_entries[1] = acl->a_entries[1];
acl2->a_entries[2] = acl->a_entries[1];
acl2->a_entries[2].e_tag = ACL_MASK;
acl2->a_entries[3] = acl->a_entries[2];
nfsacl_desc.acl = acl2;
}
err = xdr_encode_array2(buf, base + 4, &nfsacl_desc.desc);
if (!err)
err = 8 + nfsacl_desc.desc.elem_size *
nfsacl_desc.desc.array_len;
return err;
}
