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-rw-r--r--fs/smb/client/fs_context.c2
-rw-r--r--fs/smb/client/fs_context.h3
-rw-r--r--fs/smb/client/smb1ops.c6
-rw-r--r--fs/smb/client/smb2ops.c27
-rw-r--r--fs/smb/common/smb2pdu.h3
5 files changed, 30 insertions, 11 deletions
diff --git a/fs/smb/client/fs_context.c b/fs/smb/client/fs_context.c
index 9c3ded0cf006..ed543325c518 100644
--- a/fs/smb/client/fs_context.c
+++ b/fs/smb/client/fs_context.c
@@ -1333,6 +1333,7 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
case Opt_rsize:
ctx->rsize = result.uint_32;
ctx->got_rsize = true;
+ ctx->vol_rsize = ctx->rsize;
break;
case Opt_wsize:
ctx->wsize = result.uint_32;
@@ -1348,6 +1349,7 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
ctx->wsize, PAGE_SIZE);
}
}
+ ctx->vol_wsize = ctx->wsize;
break;
case Opt_acregmax:
if (result.uint_32 > CIFS_MAX_ACTIMEO / HZ) {
diff --git a/fs/smb/client/fs_context.h b/fs/smb/client/fs_context.h
index 42c6b66c2c1a..23491401dac5 100644
--- a/fs/smb/client/fs_context.h
+++ b/fs/smb/client/fs_context.h
@@ -280,6 +280,9 @@ struct smb3_fs_context {
bool use_client_guid:1;
/* reuse existing guid for multichannel */
u8 client_guid[SMB2_CLIENT_GUID_SIZE];
+ /* User-specified original r/wsize value */
+ unsigned int vol_rsize;
+ unsigned int vol_wsize;
unsigned int bsize;
unsigned int rasize;
unsigned int rsize;
diff --git a/fs/smb/client/smb1ops.c b/fs/smb/client/smb1ops.c
index 8701484805cd..06b28da60a2d 100644
--- a/fs/smb/client/smb1ops.c
+++ b/fs/smb/client/smb1ops.c
@@ -444,8 +444,8 @@ cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
unsigned int wsize;
/* start with specified wsize, or default */
- if (ctx->wsize)
- wsize = ctx->wsize;
+ if (ctx->got_wsize)
+ wsize = ctx->vol_wsize;
else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
wsize = CIFS_DEFAULT_IOSIZE;
else
@@ -497,7 +497,7 @@ cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
else
defsize = server->maxBuf - sizeof(READ_RSP);
- rsize = ctx->rsize ? ctx->rsize : defsize;
+ rsize = ctx->got_rsize ? ctx->vol_rsize : defsize;
/*
* no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
index a700e5921961..98643a546c68 100644
--- a/fs/smb/client/smb2ops.c
+++ b/fs/smb/client/smb2ops.c
@@ -470,6 +470,17 @@ smb2_negotiate(const unsigned int xid,
return rc;
}
+static inline unsigned int
+prevent_zero_iosize(unsigned int size, const char *type)
+{
+ if (size == 0) {
+ cifs_dbg(VFS, "SMB: Zero %ssize calculated, using minimum value %u\n",
+ type, CIFS_MIN_DEFAULT_IOSIZE);
+ return CIFS_MIN_DEFAULT_IOSIZE;
+ }
+ return size;
+}
+
static unsigned int
smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
{
@@ -477,12 +488,12 @@ smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
unsigned int wsize;
/* start with specified wsize, or default */
- wsize = ctx->wsize ? ctx->wsize : CIFS_DEFAULT_IOSIZE;
+ wsize = ctx->got_wsize ? ctx->vol_wsize : CIFS_DEFAULT_IOSIZE;
wsize = min_t(unsigned int, wsize, server->max_write);
if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
- return wsize;
+ return prevent_zero_iosize(wsize, "w");
}
static unsigned int
@@ -492,7 +503,7 @@ smb3_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
unsigned int wsize;
/* start with specified wsize, or default */
- wsize = ctx->wsize ? ctx->wsize : SMB3_DEFAULT_IOSIZE;
+ wsize = ctx->got_wsize ? ctx->vol_wsize : SMB3_DEFAULT_IOSIZE;
wsize = min_t(unsigned int, wsize, server->max_write);
#ifdef CONFIG_CIFS_SMB_DIRECT
if (server->rdma) {
@@ -514,7 +525,7 @@ smb3_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
- return wsize;
+ return prevent_zero_iosize(wsize, "w");
}
static unsigned int
@@ -524,13 +535,13 @@ smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
unsigned int rsize;
/* start with specified rsize, or default */
- rsize = ctx->rsize ? ctx->rsize : CIFS_DEFAULT_IOSIZE;
+ rsize = ctx->got_rsize ? ctx->vol_rsize : CIFS_DEFAULT_IOSIZE;
rsize = min_t(unsigned int, rsize, server->max_read);
if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
- return rsize;
+ return prevent_zero_iosize(rsize, "r");
}
static unsigned int
@@ -540,7 +551,7 @@ smb3_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
unsigned int rsize;
/* start with specified rsize, or default */
- rsize = ctx->rsize ? ctx->rsize : SMB3_DEFAULT_IOSIZE;
+ rsize = ctx->got_rsize ? ctx->vol_rsize : SMB3_DEFAULT_IOSIZE;
rsize = min_t(unsigned int, rsize, server->max_read);
#ifdef CONFIG_CIFS_SMB_DIRECT
if (server->rdma) {
@@ -563,7 +574,7 @@ smb3_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
- return rsize;
+ return prevent_zero_iosize(rsize, "r");
}
/*
diff --git a/fs/smb/common/smb2pdu.h b/fs/smb/common/smb2pdu.h
index c7a0efda4403..764dca80c15c 100644
--- a/fs/smb/common/smb2pdu.h
+++ b/fs/smb/common/smb2pdu.h
@@ -95,6 +95,9 @@
*/
#define SMB3_DEFAULT_IOSIZE (4 * 1024 * 1024)
+/* According to MS-SMB2 specification The minimum recommended value is 65536.*/
+#define CIFS_MIN_DEFAULT_IOSIZE (65536)
+
/*
* SMB2 Header Definition
*
generated by cgit (git 2.34.1) at 2025-05-10 03:10:40 +0000