cifs: untangle server->maxBuf and CIFSMaxBufSize

server->maxBuf is the maximum SMB size (including header) that the
server can handle. CIFSMaxBufSize is the maximum amount of data (sans
header) that the client can handle. Currently maxBuf is being capped at
CIFSMaxBufSize + the max headers size, and the two values are used
somewhat interchangeably in the code.

This makes little sense as these two values are not related at all.
Separate them and make sure the code uses the right values in the right
places.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 9 insertions, 23 deletions

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index b7df4bff3aaa..602326fa4a4f 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -453,8 +453,7 @@ CIFSSMBNegotiate(unsigned int xid, struct cifs_ses *ses)
                 }
                 server->sec_mode = (__u8)le16_to_cpu(rsp->SecurityMode);
                 server->maxReq = le16_to_cpu(rsp->MaxMpxCount);
-                server->maxBuf = min((__u32)le16_to_cpu(rsp->MaxBufSize),
-                                (__u32)CIFSMaxBufSize + MAX_CIFS_HDR_SIZE);
+                server->maxBuf = le16_to_cpu(rsp->MaxBufSize);
                 server->max_vcs = le16_to_cpu(rsp->MaxNumberVcs);
                 /* even though we do not use raw we might as well set this
                 accurately, in case we ever find a need for it */
@@ -561,8 +560,7 @@ CIFSSMBNegotiate(unsigned int xid, struct cifs_ses *ses)
            little endian */
         server->maxReq = le16_to_cpu(pSMBr->MaxMpxCount);
         /* probably no need to store and check maxvcs */
-        server->maxBuf = min(le32_to_cpu(pSMBr->MaxBufferSize),
-                        (__u32) CIFSMaxBufSize + MAX_CIFS_HDR_SIZE);
+        server->maxBuf = le32_to_cpu(pSMBr->MaxBufferSize);
         server->max_rw = le32_to_cpu(pSMBr->MaxRawSize);
         cFYI(DBG2, "Max buf = %d", ses->server->maxBuf);
         server->capabilities = le32_to_cpu(pSMBr->Capabilities);
@@ -2812,8 +2810,7 @@ CIFSSMBQueryReparseLinkInfo(const int xid, struct cifs_tcon *tcon,
         pSMB->TotalDataCount = 0;
         pSMB->MaxParameterCount = cpu_to_le32(2);
         /* BB find exact data count max from sess structure BB */
-        pSMB->MaxDataCount = cpu_to_le32((tcon->ses->server->maxBuf -
-                                          MAX_CIFS_HDR_SIZE) & 0xFFFFFF00);
+        pSMB->MaxDataCount = cpu_to_le32(CIFSMaxBufSize & 0xFFFFFF00);
         pSMB->MaxSetupCount = 4;
         pSMB->Reserved = 0;
         pSMB->ParameterOffset = 0;
@@ -3306,8 +3303,7 @@ smb_init_nttransact(const __u16 sub_command, const int setup_count,
         pSMB->Reserved = 0;
         pSMB->TotalParameterCount = cpu_to_le32(parm_len);
         pSMB->TotalDataCount  = 0;
-        pSMB->MaxDataCount = cpu_to_le32((tcon->ses->server->maxBuf -
-                                          MAX_CIFS_HDR_SIZE) & 0xFFFFFF00);
+        pSMB->MaxDataCount = cpu_to_le32(CIFSMaxBufSize & 0xFFFFFF00);
         pSMB->ParameterCount = pSMB->TotalParameterCount;
         pSMB->DataCount  = pSMB->TotalDataCount;
         temp_offset = offsetof(struct smb_com_ntransact_req, Parms) +
@@ -3977,8 +3973,7 @@ findFirstRetry:
         params = 12 + name_len /* includes null */ ;
         pSMB->TotalDataCount = 0;       /* no EAs */
         pSMB->MaxParameterCount = cpu_to_le16(10);
-        pSMB->MaxDataCount = cpu_to_le16((tcon->ses->server->maxBuf -
-                                          MAX_CIFS_HDR_SIZE) & 0xFFFFFF00);
+        pSMB->MaxDataCount = cpu_to_le16(CIFSMaxBufSize & 0xFFFFFF00);
         pSMB->MaxSetupCount = 0;
         pSMB->Reserved = 0;
         pSMB->Flags = 0;
@@ -4052,8 +4047,7 @@ findFirstRetry:
                         psrch_inf->index_of_last_entry = 2 /* skip . and .. */ +
                                 psrch_inf->entries_in_buffer;
                         lnoff = le16_to_cpu(parms->LastNameOffset);
-                        if (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE <
-                              lnoff) {
+                        if (CIFSMaxBufSize < lnoff) {
                                 cERROR(1, "ignoring corrupt resume name");
                                 psrch_inf->last_entry = NULL;
                                 return rc;
@@ -4097,9 +4091,7 @@ int CIFSFindNext(const int xid, struct cifs_tcon *tcon,
         byte_count = 0;
         pSMB->TotalDataCount = 0;       /* no EAs */
         pSMB->MaxParameterCount = cpu_to_le16(8);
-        pSMB->MaxDataCount =
-                cpu_to_le16((tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) &
-                                0xFFFFFF00);
+        pSMB->MaxDataCount = cpu_to_le16(CIFSMaxBufSize & 0xFFFFFF00);
         pSMB->MaxSetupCount = 0;
         pSMB->Reserved = 0;
         pSMB->Flags = 0;
@@ -4181,8 +4173,7 @@ int CIFSFindNext(const int xid, struct cifs_tcon *tcon,
                         psrch_inf->index_of_last_entry +=
                                 psrch_inf->entries_in_buffer;
                         lnoff = le16_to_cpu(parms->LastNameOffset);
-                        if (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE <
-                              lnoff) {
+                        if (CIFSMaxBufSize < lnoff) {
                                 cERROR(1, "ignoring corrupt resume name");
                                 psrch_inf->last_entry = NULL;
                                 return rc;
@@ -6035,12 +6026,7 @@ int CIFSSMBNotify(const int xid, struct cifs_tcon *tcon,
         pSMB->TotalParameterCount = 0 ;
         pSMB->TotalDataCount = 0;
         pSMB->MaxParameterCount = cpu_to_le32(2);
-        /* BB find exact data count max from sess structure BB */
-        pSMB->MaxDataCount = 0; /* same in little endian or be */
-/* BB VERIFY verify which is correct for above BB */
-        pSMB->MaxDataCount = cpu_to_le32((tcon->ses->server->maxBuf -
-                                             MAX_CIFS_HDR_SIZE) & 0xFFFFFF00);
-
+        pSMB->MaxDataCount = cpu_to_le32(CIFSMaxBufSize & 0xFFFFFF00);
         pSMB->MaxSetupCount = 4;
         pSMB->Reserved = 0;
         pSMB->ParameterOffset = 0;