/* * Allocate a new ACL with the specified number of entries. */ struct posix_acl * posix_acl_alloc(int count, gfp_t flags) { const size_t size = sizeof(struct posix_acl) + count * sizeof(struct posix_acl_entry); struct posix_acl *acl = kmalloc(size, flags); if (acl) posix_acl_init(acl, count); return acl; }
/** * 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; }
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; }