From d4e4854fd1c85ac8ba4d6de39703e07704754b85 Mon Sep 17 00:00:00 2001 From: Pavel Shilovsky Date: Fri, 23 Mar 2012 14:28:02 -0400 Subject: CIFS: Separate protocol-specific code from demultiplex code Signed-off-by: Pavel Shilovsky --- fs/cifs/cifs_debug.c | 5 ++-- fs/cifs/cifs_debug.h | 2 +- fs/cifs/cifsglob.h | 2 +- fs/cifs/cifsproto.h | 5 ++-- fs/cifs/connect.c | 78 ++++++++++++++++++++++++++++------------------------ fs/cifs/misc.c | 7 +++-- fs/cifs/transport.c | 4 +-- 7 files changed, 56 insertions(+), 47 deletions(-) (limited to 'fs/cifs') diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c index 573b899b5a5d..bcd0db783196 100644 --- a/fs/cifs/cifs_debug.c +++ b/fs/cifs/cifs_debug.c @@ -58,15 +58,16 @@ cifs_dump_mem(char *label, void *data, int length) } #ifdef CONFIG_CIFS_DEBUG2 -void cifs_dump_detail(struct smb_hdr *smb) +void cifs_dump_detail(void *buf) { + struct smb_hdr *smb = (struct smb_hdr *)buf; + cERROR(1, "Cmd: %d Err: 0x%x Flags: 0x%x Flgs2: 0x%x Mid: %d Pid: %d", smb->Command, smb->Status.CifsError, smb->Flags, smb->Flags2, smb->Mid, smb->Pid); cERROR(1, "smb buf %p len %d", smb, smbCalcSize(smb)); } - void cifs_dump_mids(struct TCP_Server_Info *server) { struct list_head *tmp; diff --git a/fs/cifs/cifs_debug.h b/fs/cifs/cifs_debug.h index 0a234c1db947..566e0ae8dc2c 100644 --- a/fs/cifs/cifs_debug.h +++ b/fs/cifs/cifs_debug.h @@ -26,7 +26,7 @@ void cifs_dump_mem(char *label, void *data, int length); #ifdef CONFIG_CIFS_DEBUG2 #define DBG2 2 -void cifs_dump_detail(struct smb_hdr *); +void cifs_dump_detail(void *); void cifs_dump_mids(struct TCP_Server_Info *); #else #define DBG2 0 diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index c3c7d7c46220..34a897e3d225 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -730,7 +730,7 @@ struct mid_q_entry { mid_receive_t *receive; /* call receive callback */ mid_callback_t *callback; /* call completion callback */ void *callback_data; /* general purpose pointer for callback */ - struct smb_hdr *resp_buf; /* pointer to received SMB header */ + void *resp_buf; /* pointer to received SMB header */ int midState; /* wish this were enum but can not pass to wait_event */ __u8 command; /* smb command code */ bool largeBuf:1; /* if valid response, is pointer to large buf */ diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index 5f2f266c42a4..70124ae77aa8 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -91,9 +91,8 @@ extern int SendReceiveBlockingLock(const unsigned int xid, extern void cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add); extern void cifs_set_credits(struct TCP_Server_Info *server, const int val); -extern int checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int length); -extern bool is_valid_oplock_break(struct smb_hdr *smb, - struct TCP_Server_Info *); +extern int checkSMB(char *buf, unsigned int length); +extern bool is_valid_oplock_break(char *, struct TCP_Server_Info *); extern bool backup_cred(struct cifs_sb_info *); extern bool is_size_safe_to_change(struct cifsInodeInfo *, __u64 eof); extern void cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 5560e1d5e54b..cb6e757feb52 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -183,8 +183,9 @@ cifs_reconnect(struct TCP_Server_Info *server) -EINVAL = invalid transact2 */ -static int check2ndT2(struct smb_hdr *pSMB) +static int check2ndT2(char *buf) { + struct smb_hdr *pSMB = (struct smb_hdr *)buf; struct smb_t2_rsp *pSMBt; int remaining; __u16 total_data_size, data_in_this_rsp; @@ -224,10 +225,10 @@ static int check2ndT2(struct smb_hdr *pSMB) return remaining; } -static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB) +static int coalesce_t2(char *second_buf, struct smb_hdr *target_hdr) { - struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)psecond; - struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB; + struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf; + struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr; char *data_area_of_tgt; char *data_area_of_src; int remaining; @@ -280,23 +281,23 @@ static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB) put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount); /* fix up the BCC */ - byte_count = get_bcc(pTargetSMB); + byte_count = get_bcc(target_hdr); byte_count += total_in_src; /* is the result too big for the field? */ if (byte_count > USHRT_MAX) { cFYI(1, "coalesced BCC too large (%u)", byte_count); return -EPROTO; } - put_bcc(byte_count, pTargetSMB); + put_bcc(byte_count, target_hdr); - byte_count = be32_to_cpu(pTargetSMB->smb_buf_length); + byte_count = be32_to_cpu(target_hdr->smb_buf_length); byte_count += total_in_src; /* don't allow buffer to overflow */ if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { cFYI(1, "coalesced BCC exceeds buffer size (%u)", byte_count); return -ENOBUFS; } - pTargetSMB->smb_buf_length = cpu_to_be32(byte_count); + target_hdr->smb_buf_length = cpu_to_be32(byte_count); /* copy second buffer into end of first buffer */ memcpy(data_area_of_tgt, data_area_of_src, total_in_src); @@ -337,6 +338,18 @@ requeue_echo: queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL); } +static inline size_t +header_size(void) +{ + return sizeof(struct smb_hdr); +} + +static inline size_t +max_header_size(void) +{ + return MAX_CIFS_HDR_SIZE; +} + static bool allocate_buffers(struct TCP_Server_Info *server) { @@ -350,7 +363,7 @@ allocate_buffers(struct TCP_Server_Info *server) } } else if (server->large_buf) { /* we are reusing a dirty large buf, clear its start */ - memset(server->bigbuf, 0, sizeof(struct smb_hdr)); + memset(server->bigbuf, 0, header_size()); } if (!server->smallbuf) { @@ -364,7 +377,7 @@ allocate_buffers(struct TCP_Server_Info *server) /* beginning of smb buffer is cleared in our buf_get */ } else { /* if existing small buf clear beginning */ - memset(server->smallbuf, 0, sizeof(struct smb_hdr)); + memset(server->smallbuf, 0, header_size()); } return true; @@ -566,8 +579,9 @@ is_smb_response(struct TCP_Server_Info *server, unsigned char type) } static struct mid_q_entry * -find_mid(struct TCP_Server_Info *server, struct smb_hdr *buf) +find_mid(struct TCP_Server_Info *server, char *buffer) { + struct smb_hdr *buf = (struct smb_hdr *)buffer; struct mid_q_entry *mid; spin_lock(&GlobalMid_Lock); @@ -600,7 +614,7 @@ dequeue_mid(struct mid_q_entry *mid, bool malformed) static void handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server, - struct smb_hdr *buf, int malformed) + char *buf, int malformed) { if (malformed == 0 && check2ndT2(buf) > 0) { mid->multiRsp = true; @@ -731,11 +745,10 @@ standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid) { int length; char *buf = server->smallbuf; - struct smb_hdr *smb_buffer = (struct smb_hdr *)buf; - unsigned int pdu_length = be32_to_cpu(smb_buffer->smb_buf_length); + unsigned int pdu_length = get_rfc1002_length(buf); /* make sure this will fit in a large buffer */ - if (pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { + if (pdu_length > CIFSMaxBufSize + max_header_size() - 4) { cERROR(1, "SMB response too long (%u bytes)", pdu_length); cifs_reconnect(server); @@ -746,20 +759,18 @@ standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid) /* switch to large buffer if too big for a small one */ if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) { server->large_buf = true; - memcpy(server->bigbuf, server->smallbuf, server->total_read); + memcpy(server->bigbuf, buf, server->total_read); buf = server->bigbuf; - smb_buffer = (struct smb_hdr *)buf; } /* now read the rest */ - length = cifs_read_from_socket(server, - buf + sizeof(struct smb_hdr) - 1, - pdu_length - sizeof(struct smb_hdr) + 1 + 4); + length = cifs_read_from_socket(server, buf + header_size() - 1, + pdu_length - header_size() + 1 + 4); if (length < 0) return length; server->total_read += length; - dump_smb(smb_buffer, server->total_read); + dump_smb(buf, server->total_read); /* * We know that we received enough to get to the MID as we @@ -770,7 +781,7 @@ standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid) * 48 bytes is enough to display the header and a little bit * into the payload for debugging purposes. */ - length = checkSMB(smb_buffer, smb_buffer->Mid, server->total_read); + length = checkSMB(buf, server->total_read); if (length != 0) cifs_dump_mem("Bad SMB: ", buf, min_t(unsigned int, server->total_read, 48)); @@ -778,7 +789,7 @@ standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid) if (!mid) return length; - handle_mid(mid, server, smb_buffer, length); + handle_mid(mid, server, buf, length); return 0; } @@ -789,7 +800,6 @@ cifs_demultiplex_thread(void *p) struct TCP_Server_Info *server = p; unsigned int pdu_length; char *buf = NULL; - struct smb_hdr *smb_buffer = NULL; struct task_struct *task_to_wake = NULL; struct mid_q_entry *mid_entry; @@ -810,7 +820,6 @@ cifs_demultiplex_thread(void *p) continue; server->large_buf = false; - smb_buffer = (struct smb_hdr *)server->smallbuf; buf = server->smallbuf; pdu_length = 4; /* enough to get RFC1001 header */ @@ -823,14 +832,14 @@ cifs_demultiplex_thread(void *p) * The right amount was read from socket - 4 bytes, * so we can now interpret the length field. */ - pdu_length = be32_to_cpu(smb_buffer->smb_buf_length); + pdu_length = get_rfc1002_length(buf); cFYI(1, "RFC1002 header 0x%x", pdu_length); if (!is_smb_response(server, buf[0])) continue; /* make sure we have enough to get to the MID */ - if (pdu_length < sizeof(struct smb_hdr) - 1 - 4) { + if (pdu_length < header_size() - 1 - 4) { cERROR(1, "SMB response too short (%u bytes)", pdu_length); cifs_reconnect(server); @@ -840,12 +849,12 @@ cifs_demultiplex_thread(void *p) /* read down to the MID */ length = cifs_read_from_socket(server, buf + 4, - sizeof(struct smb_hdr) - 1 - 4); + header_size() - 1 - 4); if (length < 0) continue; server->total_read += length; - mid_entry = find_mid(server, smb_buffer); + mid_entry = find_mid(server, buf); if (!mid_entry || !mid_entry->receive) length = standard_receive3(server, mid_entry); @@ -855,22 +864,19 @@ cifs_demultiplex_thread(void *p) if (length < 0) continue; - if (server->large_buf) { + if (server->large_buf) buf = server->bigbuf; - smb_buffer = (struct smb_hdr *)buf; - } server->lstrp = jiffies; if (mid_entry != NULL) { if (!mid_entry->multiRsp || mid_entry->multiEnd) mid_entry->callback(mid_entry); - } else if (!is_valid_oplock_break(smb_buffer, server)) { + } else if (!is_valid_oplock_break(buf, server)) { cERROR(1, "No task to wake, unknown frame received! " "NumMids %d", atomic_read(&midCount)); - cifs_dump_mem("Received Data is: ", buf, - sizeof(struct smb_hdr)); + cifs_dump_mem("Received Data is: ", buf, header_size()); #ifdef CONFIG_CIFS_DEBUG2 - cifs_dump_detail(smb_buffer); + cifs_dump_detail(buf); cifs_dump_mids(server); #endif /* CIFS_DEBUG2 */ diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index e88601fc6f22..dc61dff2c42a 100644 --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -420,8 +420,10 @@ check_smb_hdr(struct smb_hdr *smb, __u16 mid) } int -checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int total_read) +checkSMB(char *buf, unsigned int total_read) { + struct smb_hdr *smb = (struct smb_hdr *)buf; + __u16 mid = smb->Mid; __u32 rfclen = be32_to_cpu(smb->smb_buf_length); __u32 clc_len; /* calculated length */ cFYI(0, "checkSMB Length: 0x%x, smb_buf_length: 0x%x", @@ -502,8 +504,9 @@ checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int total_read) } bool -is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv) +is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv) { + struct smb_hdr *buf = (struct smb_hdr *)buffer; struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf; struct list_head *tmp, *tmp1, *tmp2; struct cifs_ses *ses; diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c index 3bb447d07a1d..66b4edec0e8e 100644 --- a/fs/cifs/transport.c +++ b/fs/cifs/transport.c @@ -778,7 +778,7 @@ SendReceive(const unsigned int xid, struct cifs_ses *ses, goto out; } - *pbytes_returned = be32_to_cpu(midQ->resp_buf->smb_buf_length); + *pbytes_returned = get_rfc1002_length(midQ->resp_buf); memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); rc = cifs_check_receive(midQ, ses->server, 0); out: @@ -945,7 +945,7 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, goto out; } - *pbytes_returned = be32_to_cpu(midQ->resp_buf->smb_buf_length); + *pbytes_returned = get_rfc1002_length(midQ->resp_buf); memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); rc = cifs_check_receive(midQ, ses->server, 0); out: -- cgit v1.2.3