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authorJeff Layton <jlayton@redhat.com>2012-01-17 16:08:51 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2012-01-25 16:13:57 -0800
commitbdac3a105a1c8fdf89ea15404ad5c7bcec73d37a (patch)
treea0c9f55087de52623eacbfaabb335ce169b6f6f9
parent5f4972712d070a70b2ac50c7f75a6b2dac1be74b (diff)
cifs: lower default wsize when unix extensions are not used
commit ce91acb3acae26f4163c5a6f1f695d1a1e8d9009 upstream. We've had some reports of servers (namely, the Solaris in-kernel CIFS server) that don't deal properly with writes that are "too large" even though they set CAP_LARGE_WRITE_ANDX. Change the default to better mirror what windows clients do. Cc: Pavel Shilovsky <piastry@etersoft.ru> Reported-by: Nick Davis <phireph0x@yahoo.com> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--fs/cifs/connect.c23
1 files changed, 19 insertions, 4 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index f3670cf72587..63e4be46eec4 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2914,18 +2914,33 @@ void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
#define CIFS_DEFAULT_IOSIZE (1024 * 1024)
/*
- * Windows only supports a max of 60k reads. Default to that when posix
- * extensions aren't in force.
+ * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
+ * those values when posix extensions aren't in force. In actuality here, we
+ * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
+ * to be ok with the extra byte even though Windows doesn't send writes that
+ * are that large.
+ *
+ * Citation:
+ *
+ * http://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
*/
#define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
+#define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
static unsigned int
cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
{
__u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
struct TCP_Server_Info *server = tcon->ses->server;
- unsigned int wsize = pvolume_info->wsize ? pvolume_info->wsize :
- CIFS_DEFAULT_IOSIZE;
+ unsigned int wsize;
+
+ /* start with specified wsize, or default */
+ if (pvolume_info->wsize)
+ wsize = pvolume_info->wsize;
+ else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
+ wsize = CIFS_DEFAULT_IOSIZE;
+ else
+ wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
/* can server support 24-bit write sizes? (via UNIX extensions) */
if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))