[CIFS] Set copychunk defaults

Patch 2 of the copy chunk series (the final patch will
use these to handle copies of files larger than the chunk size.

We set the same defaults that Windows and Samba expect for
CopyChunk.

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: David Disseldorp <ddiss@samba.org>

2 files changed, 12 insertions, 1 deletions

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 50a6ca1bb521..d9ea7ada1378 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -858,6 +858,9 @@ struct cifs_tcon {
         __le64 vol_create_time;
         __u32 ss_flags;         /* sector size flags */
         __u32 perf_sector_size; /* best sector size for perf */
+        __u32 max_chunks;
+        __u32 max_bytes_chunk;
+        __u32 max_bytes_copy;
 #endif /* CONFIG_CIFS_SMB2 */
 #ifdef CONFIG_CIFS_FSCACHE
         u64 resource_id;                /* server resource id */
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 8ab05b0d6778..ca7f307ad97a 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -717,6 +717,14 @@ static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 
 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 
+/* These are similar values to what Windows uses */
+static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
+{
+        tcon->max_chunks = 256;
+        tcon->max_bytes_chunk = 1048576;
+        tcon->max_bytes_copy = 16777216;
+}
+
 int
 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
           struct cifs_tcon *tcon, const struct nls_table *cp)
@@ -818,7 +826,7 @@ SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
-
+        init_copy_chunk_defaults(tcon);
 tcon_exit:
         free_rsp_buf(resp_buftype, rsp);
         kfree(unc_path);