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authorPavel Shilovsky <piastry@etersoft.ru>2012-01-12 22:40:50 +0400
committerPavel Shilovsky <pshilovsky@samba.org>2012-07-24 21:54:54 +0400
commit3792c1732878822ebf5a1c7e83e23453b9bbb698 (patch)
treee8c901db3f440f21233d24f9ebd65be29624b5e5 /fs/cifs
parent093b2bdad3221e3fae3c26d89387e7297a157664 (diff)
downloadlinux-3792c1732878822ebf5a1c7e83e23453b9bbb698.tar.bz2
CIFS: Respect SMB2 header/max header size
Use SMB2 header size values for allocation and memset because they are bigger and suitable for both CIFS and SMB2. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/cifsfs.c14
-rw-r--r--fs/cifs/misc.c25
2 files changed, 31 insertions, 8 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 2e9929dc2072..7a7cda9f7912 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -48,6 +48,9 @@
#include <linux/key-type.h>
#include "cifs_spnego.h"
#include "fscache.h"
+#ifdef CONFIG_CIFS_SMB2
+#include "smb2pdu.h"
+#endif
#define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
int cifsFYI = 0;
@@ -980,6 +983,14 @@ cifs_destroy_inodecache(void)
static int
cifs_init_request_bufs(void)
{
+ size_t max_hdr_size = MAX_CIFS_HDR_SIZE;
+#ifdef CONFIG_CIFS_SMB2
+ /*
+ * SMB2 maximum header size is bigger than CIFS one - no problems to
+ * allocate some more bytes for CIFS.
+ */
+ max_hdr_size = MAX_SMB2_HDR_SIZE;
+#endif
if (CIFSMaxBufSize < 8192) {
/* Buffer size can not be smaller than 2 * PATH_MAX since maximum
Unicode path name has to fit in any SMB/CIFS path based frames */
@@ -991,8 +1002,7 @@ cifs_init_request_bufs(void)
}
/* cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
cifs_req_cachep = kmem_cache_create("cifs_request",
- CIFSMaxBufSize +
- MAX_CIFS_HDR_SIZE, 0,
+ CIFSMaxBufSize + max_hdr_size, 0,
SLAB_HWCACHE_ALIGN, NULL);
if (cifs_req_cachep == NULL)
return -ENOMEM;
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 64601146f157..ad2538a64c70 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -29,6 +29,9 @@
#include "smberr.h"
#include "nterr.h"
#include "cifs_unicode.h"
+#ifdef CONFIG_CIFS_SMB2
+#include "smb2pdu.h"
+#endif
extern mempool_t *cifs_sm_req_poolp;
extern mempool_t *cifs_req_poolp;
@@ -143,17 +146,27 @@ struct smb_hdr *
cifs_buf_get(void)
{
struct smb_hdr *ret_buf = NULL;
-
-/* We could use negotiated size instead of max_msgsize -
- but it may be more efficient to always alloc same size
- albeit slightly larger than necessary and maxbuffersize
- defaults to this and can not be bigger */
+ size_t buf_size = sizeof(struct smb_hdr);
+
+#ifdef CONFIG_CIFS_SMB2
+ /*
+ * SMB2 header is bigger than CIFS one - no problems to clean some
+ * more bytes for CIFS.
+ */
+ buf_size = sizeof(struct smb2_hdr);
+#endif
+ /*
+ * We could use negotiated size instead of max_msgsize -
+ * but it may be more efficient to always alloc same size
+ * albeit slightly larger than necessary and maxbuffersize
+ * defaults to this and can not be bigger.
+ */
ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS);
/* clear the first few header bytes */
/* for most paths, more is cleared in header_assemble */
if (ret_buf) {
- memset(ret_buf, 0, sizeof(struct smb_hdr) + 3);
+ memset(ret_buf, 0, buf_size + 3);
atomic_inc(&bufAllocCount);
#ifdef CONFIG_CIFS_STATS2
atomic_inc(&totBufAllocCount);