diff options
Diffstat (limited to 'fs/cifs/cifssmb.c')
-rw-r--r-- | fs/cifs/cifssmb.c | 184 |
1 files changed, 100 insertions, 84 deletions
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index d5eac48fc41..552642a507c 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -190,10 +190,10 @@ small_smb_init(int smb_command, int wct, struct cifsTconInfo *tcon, /* need to prevent multiple threads trying to simultaneously reconnect the same SMB session */ down(&tcon->ses->sesSem); - if (tcon->ses->status == CifsNeedReconnect) + if (tcon->ses->need_reconnect) rc = cifs_setup_session(0, tcon->ses, nls_codepage); - if (!rc && (tcon->tidStatus == CifsNeedReconnect)) { + if (!rc && (tcon->need_reconnect)) { mark_open_files_invalid(tcon); rc = CIFSTCon(0, tcon->ses, tcon->treeName, tcon, nls_codepage); @@ -337,10 +337,10 @@ smb_init(int smb_command, int wct, struct cifsTconInfo *tcon, /* need to prevent multiple threads trying to simultaneously reconnect the same SMB session */ down(&tcon->ses->sesSem); - if (tcon->ses->status == CifsNeedReconnect) + if (tcon->ses->need_reconnect) rc = cifs_setup_session(0, tcon->ses, nls_codepage); - if (!rc && (tcon->tidStatus == CifsNeedReconnect)) { + if (!rc && (tcon->need_reconnect)) { mark_open_files_invalid(tcon); rc = CIFSTCon(0, tcon->ses, tcon->treeName, tcon, nls_codepage); @@ -664,8 +664,9 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses) rc = -EIO; goto neg_err_exit; } - - if (server->socketUseCount.counter > 1) { + read_lock(&cifs_tcp_ses_lock); + if (server->srv_count > 1) { + read_unlock(&cifs_tcp_ses_lock); if (memcmp(server->server_GUID, pSMBr->u.extended_response. GUID, 16) != 0) { @@ -674,9 +675,11 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses) pSMBr->u.extended_response.GUID, 16); } - } else + } else { + read_unlock(&cifs_tcp_ses_lock); memcpy(server->server_GUID, pSMBr->u.extended_response.GUID, 16); + } if (count == 16) { server->secType = RawNTLMSSP; @@ -739,50 +742,31 @@ CIFSSMBTDis(const int xid, struct cifsTconInfo *tcon) int rc = 0; cFYI(1, ("In tree disconnect")); - /* - * If last user of the connection and - * connection alive - disconnect it - * If this is the last connection on the server session disconnect it - * (and inside session disconnect we should check if tcp socket needs - * to be freed and kernel thread woken up). - */ - if (tcon) - down(&tcon->tconSem); - else - return -EIO; - atomic_dec(&tcon->useCount); - if (atomic_read(&tcon->useCount) > 0) { - up(&tcon->tconSem); - return -EBUSY; - } + /* BB: do we need to check this? These should never be NULL. */ + if ((tcon->ses == NULL) || (tcon->ses->server == NULL)) + return -EIO; - /* No need to return error on this operation if tid invalidated and - closed on server already e.g. due to tcp session crashing */ - if (tcon->tidStatus == CifsNeedReconnect) { - up(&tcon->tconSem); + /* + * No need to return error on this operation if tid invalidated and + * closed on server already e.g. due to tcp session crashing. Also, + * the tcon is no longer on the list, so no need to take lock before + * checking this. + */ + if (tcon->need_reconnect) return 0; - } - if ((tcon->ses == NULL) || (tcon->ses->server == NULL)) { - up(&tcon->tconSem); - return -EIO; - } rc = small_smb_init(SMB_COM_TREE_DISCONNECT, 0, tcon, (void **)&smb_buffer); - if (rc) { - up(&tcon->tconSem); + if (rc) return rc; - } rc = SendReceiveNoRsp(xid, tcon->ses, smb_buffer, 0); if (rc) cFYI(1, ("Tree disconnect failed %d", rc)); - up(&tcon->tconSem); - /* No need to return error on this operation if tid invalidated and - closed on server already e.g. due to tcp session crashing */ + closed on server already e.g. due to tcp session crashing */ if (rc == -EAGAIN) rc = 0; @@ -796,43 +780,36 @@ CIFSSMBLogoff(const int xid, struct cifsSesInfo *ses) int rc = 0; cFYI(1, ("In SMBLogoff for session disconnect")); - if (ses) - down(&ses->sesSem); - else + + /* + * BB: do we need to check validity of ses and server? They should + * always be valid since we have an active reference. If not, that + * should probably be a BUG() + */ + if (!ses || !ses->server) return -EIO; - atomic_dec(&ses->inUse); - if (atomic_read(&ses->inUse) > 0) { - up(&ses->sesSem); - return -EBUSY; - } + down(&ses->sesSem); + if (ses->need_reconnect) + goto session_already_dead; /* no need to send SMBlogoff if uid + already closed due to reconnect */ rc = small_smb_init(SMB_COM_LOGOFF_ANDX, 2, NULL, (void **)&pSMB); if (rc) { up(&ses->sesSem); return rc; } - if (ses->server) { - pSMB->hdr.Mid = GetNextMid(ses->server); + pSMB->hdr.Mid = GetNextMid(ses->server); - if (ses->server->secMode & + if (ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) pSMB->hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE; - } pSMB->hdr.Uid = ses->Suid; pSMB->AndXCommand = 0xFF; rc = SendReceiveNoRsp(xid, ses, (struct smb_hdr *) pSMB, 0); - if (ses->server) { - atomic_dec(&ses->server->socketUseCount); - if (atomic_read(&ses->server->socketUseCount) == 0) { - spin_lock(&GlobalMid_Lock); - ses->server->tcpStatus = CifsExiting; - spin_unlock(&GlobalMid_Lock); - rc = -ESHUTDOWN; - } - } +session_already_dead: up(&ses->sesSem); /* if session dead then we do not need to do ulogoff, @@ -1405,13 +1382,13 @@ openRetry: if (cpu_to_le32(FILE_CREATE) == pSMBr->CreateAction) *pOplock |= CIFS_CREATE_ACTION; if (pfile_info) { - memcpy((char *)pfile_info, (char *)&pSMBr->CreationTime, - 36 /* CreationTime to Attributes */); - /* the file_info buf is endian converted by caller */ - pfile_info->AllocationSize = pSMBr->AllocationSize; - pfile_info->EndOfFile = pSMBr->EndOfFile; - pfile_info->NumberOfLinks = cpu_to_le32(1); - pfile_info->DeletePending = 0; + memcpy((char *)pfile_info, (char *)&pSMBr->CreationTime, + 36 /* CreationTime to Attributes */); + /* the file_info buf is endian converted by caller */ + pfile_info->AllocationSize = pSMBr->AllocationSize; + pfile_info->EndOfFile = pSMBr->EndOfFile; + pfile_info->NumberOfLinks = cpu_to_le32(1); + pfile_info->DeletePending = 0; } } @@ -1437,8 +1414,13 @@ CIFSSMBRead(const int xid, struct cifsTconInfo *tcon, const int netfid, cFYI(1, ("Reading %d bytes on fid %d", count, netfid)); if (tcon->ses->capabilities & CAP_LARGE_FILES) wct = 12; - else + else { wct = 10; /* old style read */ + if ((lseek >> 32) > 0) { + /* can not handle this big offset for old */ + return -EIO; + } + } *nbytes = 0; rc = small_smb_init(SMB_COM_READ_ANDX, wct, tcon, (void **) &pSMB); @@ -1454,8 +1436,6 @@ CIFSSMBRead(const int xid, struct cifsTconInfo *tcon, const int netfid, pSMB->OffsetLow = cpu_to_le32(lseek & 0xFFFFFFFF); if (wct == 12) pSMB->OffsetHigh = cpu_to_le32(lseek >> 32); - else if ((lseek >> 32) > 0) /* can not handle this big offset for old */ - return -EIO; pSMB->Remaining = 0; pSMB->MaxCount = cpu_to_le16(count & 0xFFFF); @@ -1542,8 +1522,13 @@ CIFSSMBWrite(const int xid, struct cifsTconInfo *tcon, if (tcon->ses->capabilities & CAP_LARGE_FILES) wct = 14; - else + else { wct = 12; + if ((offset >> 32) > 0) { + /* can not handle big offset for old srv */ + return -EIO; + } + } rc = smb_init(SMB_COM_WRITE_ANDX, wct, tcon, (void **) &pSMB, (void **) &pSMBr); @@ -1558,8 +1543,6 @@ CIFSSMBWrite(const int xid, struct cifsTconInfo *tcon, pSMB->OffsetLow = cpu_to_le32(offset & 0xFFFFFFFF); if (wct == 14) pSMB->OffsetHigh = cpu_to_le32(offset >> 32); - else if ((offset >> 32) > 0) /* can not handle big offset for old srv */ - return -EIO; pSMB->Reserved = 0xFFFFFFFF; pSMB->WriteMode = 0; @@ -1581,7 +1564,7 @@ CIFSSMBWrite(const int xid, struct cifsTconInfo *tcon, pSMB->DataOffset = cpu_to_le16(offsetof(struct smb_com_write_req, Data) - 4); if (buf) - memcpy(pSMB->Data, buf, bytes_sent); + memcpy(pSMB->Data, buf, bytes_sent); else if (ubuf) { if (copy_from_user(pSMB->Data, ubuf, bytes_sent)) { cifs_buf_release(pSMB); @@ -1644,10 +1627,15 @@ CIFSSMBWrite2(const int xid, struct cifsTconInfo *tcon, cFYI(1, ("write2 at %lld %d bytes", (long long)offset, count)); - if (tcon->ses->capabilities & CAP_LARGE_FILES) + if (tcon->ses->capabilities & CAP_LARGE_FILES) { wct = 14; - else + } else { wct = 12; + if ((offset >> 32) > 0) { + /* can not handle big offset for old srv */ + return -EIO; + } + } rc = small_smb_init(SMB_COM_WRITE_ANDX, wct, tcon, (void **) &pSMB); if (rc) return rc; @@ -1660,8 +1648,6 @@ CIFSSMBWrite2(const int xid, struct cifsTconInfo *tcon, pSMB->OffsetLow = cpu_to_le32(offset & 0xFFFFFFFF); if (wct == 14) pSMB->OffsetHigh = cpu_to_le32(offset >> 32); - else if ((offset >> 32) > 0) /* can not handle big offset for old srv */ - return -EIO; pSMB->Reserved = 0xFFFFFFFF; pSMB->WriteMode = 0; pSMB->Remaining = 0; @@ -1885,10 +1871,6 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon, rc = -EIO; /* bad smb */ goto plk_err_exit; } - if (pLockData == NULL) { - rc = -EINVAL; - goto plk_err_exit; - } data_offset = le16_to_cpu(pSMBr->t2.DataOffset); data_count = le16_to_cpu(pSMBr->t2.DataCount); if (data_count < sizeof(struct cifs_posix_lock)) { @@ -3922,6 +3904,27 @@ GetInodeNumOut: return rc; } +/* computes length of UCS string converted to host codepage + * @src: UCS string + * @maxlen: length of the input string in UCS characters + * (not in bytes) + * + * return: size of input string in host codepage + */ +static int hostlen_fromUCS(const __le16 *src, const int maxlen, + const struct nls_table *nls_codepage) { + int i; + int hostlen = 0; + char to[4]; + int charlen; + for (i = 0; (i < maxlen) && src[i]; ++i) { + charlen = nls_codepage->uni2char(le16_to_cpu(src[i]), + to, NLS_MAX_CHARSET_SIZE); + hostlen += charlen > 0 ? charlen : 1; + } + return hostlen; +} + /* parses DFS refferal V3 structure * caller is responsible for freeing target_nodes * returns: @@ -3932,7 +3935,8 @@ static int parse_DFS_referrals(TRANSACTION2_GET_DFS_REFER_RSP *pSMBr, unsigned int *num_of_nodes, struct dfs_info3_param **target_nodes, - const struct nls_table *nls_codepage) + const struct nls_table *nls_codepage, int remap, + const char *searchName) { int i, rc = 0; char *data_end; @@ -3983,7 +3987,18 @@ parse_DFS_referrals(TRANSACTION2_GET_DFS_REFER_RSP *pSMBr, struct dfs_info3_param *node = (*target_nodes)+i; node->flags = le16_to_cpu(pSMBr->DFSFlags); - node->path_consumed = le16_to_cpu(pSMBr->PathConsumed); + if (is_unicode) { + __le16 *tmp = kmalloc(strlen(searchName)*2 + 2, + GFP_KERNEL); + cifsConvertToUCS((__le16 *) tmp, searchName, + PATH_MAX, nls_codepage, remap); + node->path_consumed = hostlen_fromUCS(tmp, + le16_to_cpu(pSMBr->PathConsumed)/2, + nls_codepage); + kfree(tmp); + } else + node->path_consumed = le16_to_cpu(pSMBr->PathConsumed); + node->server_type = le16_to_cpu(ref->ServerType); node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags); @@ -4116,7 +4131,8 @@ getDFSRetry: /* parse returned result into more usable form */ rc = parse_DFS_referrals(pSMBr, num_of_nodes, - target_nodes, nls_codepage); + target_nodes, nls_codepage, remap, + searchName); GetDFSRefExit: cifs_buf_release(pSMB); |