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authorPavel Shilovsky <pshilovsky@samba.org>2014-06-25 11:28:57 +0400
committerSteve French <smfrench@gmail.com>2014-08-02 01:23:03 -0500
commitbed9da0213f2174719b68012bd60735a11cfe244 (patch)
tree3a88a92dcf884d1a31a8896e9513a5124cbddebb /fs/cifs/smb2ops.c
parente374d90f8a7693f24635bca9e5d56f3775bb36e2 (diff)
CIFS: Use multicredits for SMB 2.1/3 reads
If we negotiate SMB 2.1 and higher version of the protocol and a server supports large read buffer size, we need to consume 1 credit per 65536 bytes. So, we need to know how many credits we have and obtain the required number of them before constructing a readdata structure in readpages and user read. Reviewed-by: Shirish Pargaonkar <spargaonkar@suse.com> Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs/smb2ops.c')
-rw-r--r--fs/cifs/smb2ops.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 3427c1fa3806..d0210a8e9829 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -245,8 +245,9 @@ smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
/* start with specified rsize, or default */
rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
rsize = min_t(unsigned int, rsize, server->max_read);
- /* set it to the maximum buffer size value we can send with 1 credit */
- rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
+
+ if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
+ rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
return rsize;
}