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Wed, 8 Jan 2020 03:08:15 +0000 (UTC) From: Ronnie Sahlberg To: linux-cifs Cc: Ronnie Sahlberg Subject: [PATCH 1/4] cifs: prepare SMB2_query_directory to be used with compounding Date: Wed, 8 Jan 2020 13:08:04 +1000 Message-Id: <20200108030807.2460-2-lsahlber@redhat.com> In-Reply-To: <20200108030807.2460-1-lsahlber@redhat.com> References: <20200108030807.2460-1-lsahlber@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Sender: linux-cifs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org Signed-off-by: Ronnie Sahlberg --- fs/cifs/smb2pdu.c | 111 +++++++++++++++++++++++++++++++++++----------------- fs/cifs/smb2pdu.h | 2 + fs/cifs/smb2proto.h | 5 +++ 3 files changed, 82 insertions(+), 36 deletions(-) diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 9434f6dd8df3..50466062c1da 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -4296,56 +4296,38 @@ num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size) /* * Readdir/FindFirst */ -int -SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon, - u64 persistent_fid, u64 volatile_fid, int index, - struct cifs_search_info *srch_inf) +int SMB2_query_directory_init(const unsigned int xid, + struct cifs_tcon *tcon, struct smb_rqst *rqst, + u64 persistent_fid, u64 volatile_fid, + int index, int info_level) { - struct smb_rqst rqst; + struct TCP_Server_Info *server = tcon->ses->server; struct smb2_query_directory_req *req; - struct smb2_query_directory_rsp *rsp = NULL; - struct kvec iov[2]; - struct kvec rsp_iov; - int rc = 0; - int len; - int resp_buftype = CIFS_NO_BUFFER; unsigned char *bufptr; - struct TCP_Server_Info *server; - struct cifs_ses *ses = tcon->ses; __le16 asteriks = cpu_to_le16('*'); - char *end_of_smb; - unsigned int output_size = CIFSMaxBufSize; - size_t info_buf_size; - int flags = 0; + unsigned int output_size = CIFSMaxBufSize - + MAX_SMB2_CREATE_RESPONSE_SIZE - + MAX_SMB2_CLOSE_RESPONSE_SIZE; unsigned int total_len; - - if (ses && (ses->server)) - server = ses->server; - else - return -EIO; + struct kvec *iov = rqst->rq_iov; + int len, rc; rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req, &total_len); if (rc) return rc; - if (smb3_encryption_required(tcon)) - flags |= CIFS_TRANSFORM_REQ; - - switch (srch_inf->info_level) { + switch (info_level) { case SMB_FIND_FILE_DIRECTORY_INFO: req->FileInformationClass = FILE_DIRECTORY_INFORMATION; - info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1; break; case SMB_FIND_FILE_ID_FULL_DIR_INFO: req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION; - info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1; break; default: cifs_tcon_dbg(VFS, "info level %u isn't supported\n", - srch_inf->info_level); - rc = -EINVAL; - goto qdir_exit; + info_level); + return -EINVAL; } req->FileIndex = cpu_to_le32(index); @@ -4374,15 +4356,56 @@ SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon, iov[1].iov_base = (char *)(req->Buffer); iov[1].iov_len = len; + trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid, + tcon->ses->Suid, index, output_size); + + return 0; +} + +void SMB2_query_directory_free(struct smb_rqst *rqst) +{ + if (rqst && rqst->rq_iov) { + cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ + } +} + +int +SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon, + u64 persistent_fid, u64 volatile_fid, int index, + struct cifs_search_info *srch_inf) +{ + struct smb_rqst rqst; + struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE]; + struct smb2_query_directory_rsp *rsp = NULL; + int resp_buftype = CIFS_NO_BUFFER; + struct kvec rsp_iov; + int rc = 0; + struct TCP_Server_Info *server; + struct cifs_ses *ses = tcon->ses; + char *end_of_smb; + size_t info_buf_size; + int flags = 0; + + if (ses && (ses->server)) + server = ses->server; + else + return -EIO; + + if (smb3_encryption_required(tcon)) + flags |= CIFS_TRANSFORM_REQ; + memset(&rqst, 0, sizeof(struct smb_rqst)); + memset(&iov, 0, sizeof(iov)); rqst.rq_iov = iov; - rqst.rq_nvec = 2; + rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE; - trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid, - tcon->ses->Suid, index, output_size); + rc = SMB2_query_directory_init(xid, tcon, &rqst, persistent_fid, + volatile_fid, index, + srch_inf->info_level); + if (rc) + goto qdir_exit; rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov); - cifs_small_buf_release(req); rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base; if (rc) { @@ -4400,6 +4423,20 @@ SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon, goto qdir_exit; } + switch (srch_inf->info_level) { + case SMB_FIND_FILE_DIRECTORY_INFO: + info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1; + break; + case SMB_FIND_FILE_ID_FULL_DIR_INFO: + info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1; + break; + default: + cifs_tcon_dbg(VFS, "info level %u isn't supported\n", + srch_inf->info_level); + rc = -EINVAL; + goto qdir_exit; + } + rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset), le32_to_cpu(rsp->OutputBufferLength), &rsp_iov, info_buf_size); @@ -4435,11 +4472,13 @@ SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon, else cifs_tcon_dbg(VFS, "illegal search buffer type\n"); + resp_buftype = CIFS_NO_BUFFER; + trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid, tcon->ses->Suid, index, srch_inf->entries_in_buffer); - return rc; qdir_exit: + SMB2_query_directory_free(&rqst); free_rsp_buf(resp_buftype, rsp); return rc; } diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h index 7b1c379fdf7a..4c43dbd1e089 100644 --- a/fs/cifs/smb2pdu.h +++ b/fs/cifs/smb2pdu.h @@ -1282,6 +1282,8 @@ struct smb2_echo_rsp { #define SMB2_INDEX_SPECIFIED 0x04 #define SMB2_REOPEN 0x10 +#define SMB2_QUERY_DIRECTORY_IOV_SIZE 2 + struct smb2_query_directory_req { struct smb2_sync_hdr sync_hdr; __le16 StructureSize; /* Must be 33 */ diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h index 27d29f2eb6c8..6c678e00046f 100644 --- a/fs/cifs/smb2proto.h +++ b/fs/cifs/smb2proto.h @@ -197,6 +197,11 @@ extern int SMB2_echo(struct TCP_Server_Info *server); extern int SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, int index, struct cifs_search_info *srch_inf); +extern int SMB2_query_directory_init(unsigned int xid, struct cifs_tcon *tcon, + struct smb_rqst *rqst, + u64 persistent_fid, u64 volatile_fid, + int index, int info_level); +extern void SMB2_query_directory_free(struct smb_rqst *rqst); extern int SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, u32 pid, __le64 *eof);