diff options
Diffstat (limited to 'fs/cifs/smb2ops.c')
| -rw-r--r-- | fs/cifs/smb2ops.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index 3cde719ec41b..0fe87f397ac5 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -3034,6 +3034,138 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon, return rc; } +int +smb2_query_reparse_tag(const unsigned int xid, struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, const char *full_path, + __u32 *tag) +{ + int rc; + __le16 *utf16_path = NULL; + __u8 oplock = SMB2_OPLOCK_LEVEL_NONE; + struct cifs_open_parms oparms; + struct cifs_fid fid; + struct kvec err_iov = {NULL, 0}; + struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses); + int flags = 0; + struct smb_rqst rqst[3]; + int resp_buftype[3]; + struct kvec rsp_iov[3]; + struct kvec open_iov[SMB2_CREATE_IOV_SIZE]; + struct kvec io_iov[SMB2_IOCTL_IOV_SIZE]; + struct kvec close_iov[1]; + struct smb2_create_rsp *create_rsp; + struct smb2_ioctl_rsp *ioctl_rsp; + struct reparse_data_buffer *reparse_buf; + u32 plen; + + cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path); + + if (smb3_encryption_required(tcon)) + flags |= CIFS_TRANSFORM_REQ; + + memset(rqst, 0, sizeof(rqst)); + resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER; + memset(rsp_iov, 0, sizeof(rsp_iov)); + + utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb); + if (!utf16_path) + return -ENOMEM; + + /* + * setup smb2open - TODO add optimization to call cifs_get_readable_path + * to see if there is a handle already open that we can use + */ + memset(&open_iov, 0, sizeof(open_iov)); + rqst[0].rq_iov = open_iov; + rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE; + + memset(&oparms, 0, sizeof(oparms)); + oparms.tcon = tcon; + oparms.desired_access = FILE_READ_ATTRIBUTES; + oparms.disposition = FILE_OPEN; + oparms.create_options = cifs_create_options(cifs_sb, OPEN_REPARSE_POINT); + oparms.fid = &fid; + oparms.reconnect = false; + + rc = SMB2_open_init(tcon, server, + &rqst[0], &oplock, &oparms, utf16_path); + if (rc) + goto query_rp_exit; + smb2_set_next_command(tcon, &rqst[0]); + + + /* IOCTL */ + memset(&io_iov, 0, sizeof(io_iov)); + rqst[1].rq_iov = io_iov; + rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE; + + rc = SMB2_ioctl_init(tcon, server, + &rqst[1], fid.persistent_fid, + fid.volatile_fid, FSCTL_GET_REPARSE_POINT, + true /* is_fctl */, NULL, 0, + CIFSMaxBufSize - + MAX_SMB2_CREATE_RESPONSE_SIZE - + MAX_SMB2_CLOSE_RESPONSE_SIZE); + if (rc) + goto query_rp_exit; + + smb2_set_next_command(tcon, &rqst[1]); + smb2_set_related(&rqst[1]); + + + /* Close */ + memset(&close_iov, 0, sizeof(close_iov)); + rqst[2].rq_iov = close_iov; + rqst[2].rq_nvec = 1; + + rc = SMB2_close_init(tcon, server, + &rqst[2], COMPOUND_FID, COMPOUND_FID, false); + if (rc) + goto query_rp_exit; + + smb2_set_related(&rqst[2]); + + rc = compound_send_recv(xid, tcon->ses, server, + flags, 3, rqst, + resp_buftype, rsp_iov); + + create_rsp = rsp_iov[0].iov_base; + if (create_rsp && create_rsp->sync_hdr.Status) + err_iov = rsp_iov[0]; + ioctl_rsp = rsp_iov[1].iov_base; + + /* + * Open was successful and we got an ioctl response. + */ + if (rc == 0) { + /* See MS-FSCC 2.3.23 */ + + reparse_buf = (struct reparse_data_buffer *) + ((char *)ioctl_rsp + + le32_to_cpu(ioctl_rsp->OutputOffset)); + plen = le32_to_cpu(ioctl_rsp->OutputCount); + + if (plen + le32_to_cpu(ioctl_rsp->OutputOffset) > + rsp_iov[1].iov_len) { + cifs_tcon_dbg(FYI, "srv returned invalid ioctl len: %d\n", + plen); + rc = -EIO; + goto query_rp_exit; + } + *tag = le32_to_cpu(reparse_buf->ReparseTag); + } + + query_rp_exit: + kfree(utf16_path); + SMB2_open_free(&rqst[0]); + SMB2_ioctl_free(&rqst[1]); + SMB2_close_free(&rqst[2]); + free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base); + free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base); + free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base); + return rc; +} + static struct cifs_ntsd * get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb, const struct cifs_fid *cifsfid, u32 *pacllen) @@ -4986,6 +5118,8 @@ struct smb_version_operations smb30_operations = { .can_echo = smb2_can_echo, .echo = SMB2_echo, .query_path_info = smb2_query_path_info, + /* WSL tags introduced long after smb2.1, enable for SMB3, 3.11 only */ + .query_reparse_tag = smb2_query_reparse_tag, .get_srv_inum = smb2_get_srv_inum, .query_file_info = smb2_query_file_info, .set_path_size = smb2_set_path_size, @@ -5097,6 +5231,7 @@ struct smb_version_operations smb311_operations = { .can_echo = smb2_can_echo, .echo = SMB2_echo, .query_path_info = smb2_query_path_info, + .query_reparse_tag = smb2_query_reparse_tag, .get_srv_inum = smb2_get_srv_inum, .query_file_info = smb2_query_file_info, .set_path_size = smb2_set_path_size, |