[PATCH 0/4] cifs: optimize opendir and save one roundtrip

[PATCH 0/4] cifs: optimize opendir and save one roundtrip

[Ronnie Sahlberg]

Pavel, Steve

Please find an updated version of these patches.
It addresses Pavels concerns and adds an extra patch to set maxbufsize
correctly for two other functions that were found during review.

[PATCH 1/4] cifs: prepare SMB2_query_directory to be used with compounding

[Ronnie Sahlberg]

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
---
 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);
-- 
2.13.6

[PATCH 2/4] cifs: create a helper function to parse the query-directory response buffer

[Ronnie Sahlberg]

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
---
 fs/cifs/smb2pdu.c | 109 +++++++++++++++++++++++++++++++-----------------------
 1 file changed, 63 insertions(+), 46 deletions(-)

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 50466062c1da..a23ca3d0dcd9 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -4370,6 +4370,67 @@ void SMB2_query_directory_free(struct smb_rqst *rqst)
 }
 
 int
+smb2_parse_query_directory(struct cifs_tcon *tcon,
+			   struct kvec *rsp_iov,
+			   int resp_buftype,
+			   struct cifs_search_info *srch_inf)
+{
+	struct smb2_query_directory_rsp *rsp;
+	size_t info_buf_size;
+	char *end_of_smb;
+	int rc;
+
+	rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
+
+	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);
+		return -EINVAL;
+	}
+
+	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
+			       le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
+			       info_buf_size);
+	if (rc)
+		return rc;
+
+	srch_inf->unicode = true;
+
+	if (srch_inf->ntwrk_buf_start) {
+		if (srch_inf->smallBuf)
+			cifs_small_buf_release(srch_inf->ntwrk_buf_start);
+		else
+			cifs_buf_release(srch_inf->ntwrk_buf_start);
+	}
+	srch_inf->ntwrk_buf_start = (char *)rsp;
+	srch_inf->srch_entries_start = srch_inf->last_entry =
+		(char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
+	end_of_smb = rsp_iov->iov_len + (char *)rsp;
+	srch_inf->entries_in_buffer =
+			num_entries(srch_inf->srch_entries_start, end_of_smb,
+				    &srch_inf->last_entry, info_buf_size);
+	srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
+	cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
+		 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
+		 srch_inf->srch_entries_start, srch_inf->last_entry);
+	if (resp_buftype == CIFS_LARGE_BUFFER)
+		srch_inf->smallBuf = false;
+	else if (resp_buftype == CIFS_SMALL_BUFFER)
+		srch_inf->smallBuf = true;
+	else
+		cifs_tcon_dbg(VFS, "illegal search buffer type\n");
+
+	return 0;
+}
+
+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)
@@ -4382,8 +4443,6 @@ SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
 	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))
@@ -4423,55 +4482,13 @@ 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);
+	rc = smb2_parse_query_directory(tcon, &rsp_iov,	resp_buftype,
+					srch_inf);
 	if (rc) {
 		trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
 			tcon->ses->Suid, index, 0, rc);
 		goto qdir_exit;
 	}
-
-	srch_inf->unicode = true;
-
-	if (srch_inf->ntwrk_buf_start) {
-		if (srch_inf->smallBuf)
-			cifs_small_buf_release(srch_inf->ntwrk_buf_start);
-		else
-			cifs_buf_release(srch_inf->ntwrk_buf_start);
-	}
-	srch_inf->ntwrk_buf_start = (char *)rsp;
-	srch_inf->srch_entries_start = srch_inf->last_entry =
-		(char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
-	end_of_smb = rsp_iov.iov_len + (char *)rsp;
-	srch_inf->entries_in_buffer =
-			num_entries(srch_inf->srch_entries_start, end_of_smb,
-				    &srch_inf->last_entry, info_buf_size);
-	srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
-	cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
-		 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
-		 srch_inf->srch_entries_start, srch_inf->last_entry);
-	if (resp_buftype == CIFS_LARGE_BUFFER)
-		srch_inf->smallBuf = false;
-	else if (resp_buftype == CIFS_SMALL_BUFFER)
-		srch_inf->smallBuf = true;
-	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,
-- 
2.13.6

[PATCH 3/4] cifs: use compounding for open and first query-dir for readdir()

[Ronnie Sahlberg]

Combine the initial SMB2_Open and the first SMB2_Query_Directory in a compound.
This shaves one round-trip of each directory listing, changing it from 4 to 3
for small directories.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
---
 fs/cifs/cifsproto.h |  3 ++
 fs/cifs/smb2ops.c   | 96 ++++++++++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 87 insertions(+), 12 deletions(-)

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 9c229408a251..f6f3cc90cd18 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -596,6 +596,9 @@ bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface);
 
 void extract_unc_hostname(const char *unc, const char **h, size_t *len);
 int copy_path_name(char *dst, const char *src);
+int smb2_parse_query_directory(struct cifs_tcon *tcon, struct kvec *rsp_iov,
+			       int resp_buftype,
+			       struct cifs_search_info *srch_inf);
 
 #ifdef CONFIG_CIFS_DFS_UPCALL
 static inline int get_dfs_path(const unsigned int xid, struct cifs_ses *ses,
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 6250370c1170..ca8e807f9b07 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -2053,14 +2053,33 @@ smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
 		     struct cifs_search_info *srch_inf)
 {
 	__le16 *utf16_path;
-	int rc;
-	__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	struct smb_rqst rqst[2];
+	struct kvec rsp_iov[2];
+	int resp_buftype[2];
+	struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
+	struct kvec qd_iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
+	int rc, flags = 0;
+	u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 	struct cifs_open_parms oparms;
+	struct smb2_query_directory_rsp *qd_rsp = NULL;
+	struct smb2_create_rsp *op_rsp = NULL;
 
 	utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
 	if (!utf16_path)
 		return -ENOMEM;
 
+	if (smb3_encryption_required(tcon))
+		flags |= CIFS_TRANSFORM_REQ;
+
+	memset(rqst, 0, sizeof(rqst));
+	resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
+	memset(rsp_iov, 0, sizeof(rsp_iov));
+
+	/* Open */
+	memset(&open_iov, 0, sizeof(open_iov));
+	rqst[0].rq_iov = open_iov;
+	rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
+
 	oparms.tcon = tcon;
 	oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
 	oparms.disposition = FILE_OPEN;
@@ -2071,22 +2090,75 @@ smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
 	oparms.fid = fid;
 	oparms.reconnect = false;
 
-	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
-	kfree(utf16_path);
-	if (rc) {
-		cifs_dbg(FYI, "open dir failed rc=%d\n", rc);
-		return rc;
-	}
+	rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, utf16_path);
+	if (rc)
+		goto qdf_free;
+	smb2_set_next_command(tcon, &rqst[0]);
 
+	/* Query directory */
 	srch_inf->entries_in_buffer = 0;
 	srch_inf->index_of_last_entry = 2;
 
-	rc = SMB2_query_directory(xid, tcon, fid->persistent_fid,
-				  fid->volatile_fid, 0, srch_inf);
-	if (rc) {
-		cifs_dbg(FYI, "query directory failed rc=%d\n", rc);
+	memset(&qd_iov, 0, sizeof(qd_iov));
+	rqst[1].rq_iov = qd_iov;
+	rqst[1].rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
+
+	rc = SMB2_query_directory_init(xid, tcon, &rqst[1],
+				       COMPOUND_FID, COMPOUND_FID,
+				       0, srch_inf->info_level);
+	if (rc)
+		goto qdf_free;
+
+	smb2_set_related(&rqst[1]);
+
+	rc = compound_send_recv(xid, tcon->ses, flags, 2, rqst,
+				resp_buftype, rsp_iov);
+
+	/* If the open failed there is nothing to do */
+	op_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
+	if (op_rsp == NULL || op_rsp->sync_hdr.Status != STATUS_SUCCESS) {
+		cifs_dbg(FYI, "query_dir_first: open failed rc=%d\n", rc);
+		goto qdf_free;
+	}
+	fid->persistent_fid = op_rsp->PersistentFileId;
+	fid->volatile_fid = op_rsp->VolatileFileId;
+
+	/* Anything else than ENODATA means a genuine error */
+	if (rc && rc != -ENODATA) {
 		SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
+		cifs_dbg(FYI, "query_dir_first: query directory failed rc=%d\n", rc);
+		trace_smb3_query_dir_err(xid, fid->persistent_fid,
+					 tcon->tid, tcon->ses->Suid, 0, 0, rc);
+		goto qdf_free;
 	}
+
+	qd_rsp = (struct smb2_query_directory_rsp *)rsp_iov[1].iov_base;
+	if (qd_rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
+		trace_smb3_query_dir_done(xid, fid->persistent_fid,
+					  tcon->tid, tcon->ses->Suid, 0, 0);
+		srch_inf->endOfSearch = true;
+		rc = 0;
+		goto qdf_free;
+	}
+
+	rc = smb2_parse_query_directory(tcon, &rsp_iov[1], resp_buftype[1],
+					srch_inf);
+	if (rc) {
+		trace_smb3_query_dir_err(xid, fid->persistent_fid, tcon->tid,
+			tcon->ses->Suid, 0, 0, rc);
+		goto qdf_free;
+	}
+	resp_buftype[1] = CIFS_NO_BUFFER;
+
+	trace_smb3_query_dir_done(xid, fid->persistent_fid, tcon->tid,
+			tcon->ses->Suid, 0, srch_inf->entries_in_buffer);
+
+ qdf_free:
+	kfree(utf16_path);
+	SMB2_open_free(&rqst[0]);
+	SMB2_query_directory_free(&rqst[1]);
+	free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
+	free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
 	return rc;
 }
 
-- 
2.13.6

[PATCH 4/4] cifs: set correct max-buffer-size for smb2_ioctl_init()

[Ronnie Sahlberg]

Fix two places where we need to adjust down the max response size for
ioctl when it is used together with compounding.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
---
 fs/cifs/smb2ops.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index ca8e807f9b07..f2a321e97dcc 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -1523,7 +1523,9 @@ smb2_ioctl_query_info(const unsigned int xid,
 					     COMPOUND_FID, COMPOUND_FID,
 					     qi.info_type, true, buffer,
 					     qi.output_buffer_length,
-					     CIFSMaxBufSize);
+					     CIFSMaxBufSize -
+					     MAX_SMB2_CREATE_RESPONSE_SIZE -
+					     MAX_SMB2_CLOSE_RESPONSE_SIZE);
 		}
 	} else if (qi.flags == PASSTHRU_SET_INFO) {
 		/* Can eventually relax perm check since server enforces too */
@@ -2769,7 +2771,10 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
 
 	rc = SMB2_ioctl_init(tcon, &rqst[1], fid.persistent_fid,
 			     fid.volatile_fid, FSCTL_GET_REPARSE_POINT,
-			     true /* is_fctl */, NULL, 0, CIFSMaxBufSize);
+			     true /* is_fctl */, NULL, 0,
+			     CIFSMaxBufSize -
+			     MAX_SMB2_CREATE_RESPONSE_SIZE -
+			     MAX_SMB2_CLOSE_RESPONSE_SIZE);
 	if (rc)
 		goto querty_exit;
 
-- 
2.13.6

Re: [PATCH 0/4] cifs: optimize opendir and save one roundtrip

[Pavel Shilovsky]

вт, 7 янв. 2020 г. в 19:08, Ronnie Sahlberg <lsahlber@redhat.com>:

>
> Pavel, Steve
>
> Please find an updated version of these patches.
> It addresses Pavels concerns and adds an extra patch to set maxbufsize
> correctly for two other functions that were found during review.


Looks good overall, thanks!

Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>

Do we need a stable tag on the last patch?

--
Best regards,
Pavel Shilovsky

Re: [PATCH 0/4] cifs: optimize opendir and save one roundtrip

[Steve French]

tentatively merged into cifs-2.6.git for-next (and added cc:stable for
the last patch in the series) pending more testing.

On Wed, Jan 8, 2020 at 6:34 PM Pavel Shilovsky <piastryyy@gmail.com> wrote:
>
> вт, 7 янв. 2020 г. в 19:08, Ronnie Sahlberg <lsahlber@redhat.com>:
>
> >
> > Pavel, Steve
> >
> > Please find an updated version of these patches.
> > It addresses Pavels concerns and adds an extra patch to set maxbufsize
> > correctly for two other functions that were found during review.
>
>
> Looks good overall, thanks!
>
> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
>
> Do we need a stable tag on the last patch?
>
> --
> Best regards,
> Pavel Shilovsky



-- 
Thanks,

Steve