CIFS: Add readpage support for SMB2
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index da31235..fb289d2 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -393,6 +393,17 @@
return le32_to_cpu(rsp->DataLength);
}
+
+static int
+smb2_sync_read(const unsigned int xid, struct cifsFileInfo *cfile,
+ struct cifs_io_parms *parms, unsigned int *bytes_read,
+ char **buf, int *buf_type)
+{
+ parms->persistent_fid = cfile->fid.persistent_fid;
+ parms->volatile_fid = cfile->fid.volatile_fid;
+ return SMB2_read(xid, parms, bytes_read, buf, buf_type);
+}
+
struct smb_version_operations smb21_operations = {
.setup_request = smb2_setup_request,
.setup_async_request = smb2_setup_async_request,
@@ -435,6 +446,7 @@
.flush = smb2_flush_file,
.async_readv = smb2_async_readv,
.async_writev = smb2_async_writev,
+ .sync_read = smb2_sync_read,
};
struct smb_version_values smb21_values = {
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index cb6acc7..23c5693 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1329,6 +1329,57 @@
return rc;
}
+int
+SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
+ unsigned int *nbytes, char **buf, int *buf_type)
+{
+ int resp_buftype, rc = -EACCES;
+ struct smb2_read_rsp *rsp = NULL;
+ struct kvec iov[1];
+
+ *nbytes = 0;
+ rc = smb2_new_read_req(iov, io_parms, 0, 0);
+ if (rc)
+ return rc;
+
+ rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
+ &resp_buftype, CIFS_LOG_ERROR);
+
+ rsp = (struct smb2_read_rsp *)iov[0].iov_base;
+
+ if (rsp->hdr.Status == STATUS_END_OF_FILE) {
+ free_rsp_buf(resp_buftype, iov[0].iov_base);
+ return 0;
+ }
+
+ if (rc) {
+ cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
+ cERROR(1, "Send error in read = %d", rc);
+ } else {
+ *nbytes = le32_to_cpu(rsp->DataLength);
+ if ((*nbytes > CIFS_MAX_MSGSIZE) ||
+ (*nbytes > io_parms->length)) {
+ cFYI(1, "bad length %d for count %d", *nbytes,
+ io_parms->length);
+ rc = -EIO;
+ *nbytes = 0;
+ }
+ }
+
+ if (*buf) {
+ memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
+ *nbytes);
+ free_rsp_buf(resp_buftype, iov[0].iov_base);
+ } else if (resp_buftype != CIFS_NO_BUFFER) {
+ *buf = iov[0].iov_base;
+ if (resp_buftype == CIFS_SMALL_BUFFER)
+ *buf_type = CIFS_SMALL_BUFFER;
+ else if (resp_buftype == CIFS_LARGE_BUFFER)
+ *buf_type = CIFS_LARGE_BUFFER;
+ }
+ return rc;
+}
+
/*
* Check the mid_state and signature on received buffer (if any), and queue the
* workqueue completion task.
diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index ec983be..97e62f3 100644
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -98,6 +98,8 @@
u64 persistent_fid, u64 volatile_fid,
__le64 *uniqueid);
extern int smb2_async_readv(struct cifs_readdata *rdata);
+extern int SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
+ unsigned int *nbytes, char **buf, int *buf_type);
extern int smb2_async_writev(struct cifs_writedata *wdata);
extern int SMB2_echo(struct TCP_Server_Info *server);