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Commit 3792c173 authored by Pavel Shilovsky's avatar Pavel Shilovsky Committed by Pavel Shilovsky
Browse files

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: default avatarPavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: default avatarSteve French <smfrench@gmail.com>
parent 093b2bda

fs/cifs/cifsfs.c

+12 −2
Original line number Diff line number Diff line
@@ -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;

fs/cifs/misc.c

+19 −6
Original line number Diff line number Diff line
@@ -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;

	size_t buf_size = sizeof(struct smb_hdr);



/* 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 */

#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);