Commit c5a5f38f authored by Ronnie Sahlberg's avatar Ronnie Sahlberg Committed by Steve French
Browse files

cifs: add a smb2_compound_op and change QUERY_INFO to use it 



This turns most open/query-info/close patterns in cifs.ko
to become compounds.

This changes stat from using 3 roundtrips to just a single one.

Signed-off-by: default avatarRonnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent cb5c2e63

fs/cifs/smb2inode.c

+119 −12
Original line number Diff line number Diff line
@@ -37,6 +37,118 @@ 
#include "smb2pdu.h"

#include "smb2proto.h"



static int

smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,

		 struct cifs_sb_info *cifs_sb, const char *full_path,

		 __u32 desired_access, __u32 create_disposition,

		 __u32 create_options, void *data, int command)

{

	int rc;

	__le16 *utf16_path = NULL;

	__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;

	struct cifs_open_parms oparms;

	struct cifs_fid fid;

	struct cifs_ses *ses = tcon->ses;

	struct TCP_Server_Info *server = ses->server;

	int num_rqst = 0;

	struct smb_rqst rqst[3];

	int resp_buftype[3];

	struct kvec rsp_iov[3];

	struct kvec open_iov[SMB2_CREATE_IOV_SIZE];

	struct kvec qi_iov[1];

	struct kvec close_iov[1];

	struct smb2_query_info_rsp *rsp = NULL;

	int flags = 0;



	if (smb3_encryption_required(tcon))

		flags |= CIFS_TRANSFORM_REQ;



	memset(rqst, 0, sizeof(rqst));

	resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;

	memset(rsp_iov, 0, sizeof(rsp_iov));



	/* Open */

	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);

	if (!utf16_path)

		return -ENOMEM;



	oparms.tcon = tcon;

	oparms.desired_access = desired_access;

	oparms.disposition = create_disposition;

	oparms.create_options = create_options;

	oparms.fid = &fid;

	oparms.reconnect = false;



	memset(&open_iov, 0, sizeof(open_iov));

	rqst[num_rqst].rq_iov = open_iov;

	rqst[num_rqst].rq_nvec = SMB2_CREATE_IOV_SIZE;

	rc = SMB2_open_init(tcon, &rqst[num_rqst], &oplock, &oparms,

			    utf16_path);

	kfree(utf16_path);

	if (rc)

		goto finished;



	smb2_set_next_command(server, &rqst[num_rqst++]);



	/* Operation */

	switch (command) {

	case SMB2_OP_QUERY_INFO:

		memset(&qi_iov, 0, sizeof(qi_iov));

		rqst[num_rqst].rq_iov = qi_iov;

		rqst[num_rqst].rq_nvec = 1;



		rc = SMB2_query_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,

				COMPOUND_FID, FILE_ALL_INFORMATION,

				SMB2_O_INFO_FILE, 0,

				sizeof(struct smb2_file_all_info) +

					  PATH_MAX * 2);

		smb2_set_next_command(server, &rqst[num_rqst]);

		smb2_set_related(&rqst[num_rqst++]);

		break;

	default:

		cifs_dbg(VFS, "Invalid command\n");

		rc = -EINVAL;

	}

	if (rc)

		goto finished;



	/* Close */

	memset(&close_iov, 0, sizeof(close_iov));

	rqst[num_rqst].rq_iov = close_iov;

	rqst[num_rqst].rq_nvec = 1;

	rc = SMB2_close_init(tcon, &rqst[num_rqst], COMPOUND_FID,

			     COMPOUND_FID);

	smb2_set_related(&rqst[num_rqst++]);

	if (rc)

		goto finished;



	rc = compound_send_recv(xid, ses, flags, num_rqst, rqst,

				resp_buftype, rsp_iov);



 finished:

	SMB2_open_free(&rqst[0]);

	switch (command) {

	case SMB2_OP_QUERY_INFO:

		if (rc == 0) {

			rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;

			rc = smb2_validate_and_copy_iov(

				le16_to_cpu(rsp->OutputBufferOffset),

				le32_to_cpu(rsp->OutputBufferLength),

				&rsp_iov[1], sizeof(struct smb2_file_all_info),

				data);

		}

		if (rqst[1].rq_iov)

			SMB2_query_info_free(&rqst[1]);

		if (rqst[2].rq_iov)

			SMB2_close_free(&rqst[2]);

		break;

	}

	free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);

	free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);

	free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);

	return rc;

}



static int

smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,

		   struct cifs_sb_info *cifs_sb, const char *full_path,
@@ -82,11 +194,6 @@ smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon, 
	switch (command) {

	case SMB2_OP_DELETE:

		break;

	case SMB2_OP_QUERY_INFO:

		tmprc = SMB2_query_info(xid, tcon, fid.persistent_fid,

					fid.volatile_fid,

					(struct smb2_file_all_info *)data);

		break;

	case SMB2_OP_MKDIR:

		/*

		 * Directories are created through parameters in the
@@ -156,13 +263,13 @@ smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon, 
	if (smb2_data == NULL)

		return -ENOMEM;



	rc = smb2_open_op_close(xid, tcon, cifs_sb, full_path,

	rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,

			      FILE_READ_ATTRIBUTES, FILE_OPEN, 0,

			      smb2_data, SMB2_OP_QUERY_INFO);

	if (rc == -EOPNOTSUPP) {

		*symlink = true;

		/* Failed on a symbolic link - query a reparse point info */

		rc = smb2_open_op_close(xid, tcon, cifs_sb, full_path,

		rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,

				      FILE_READ_ATTRIBUTES, FILE_OPEN,

				      OPEN_REPARSE_POINT, smb2_data,

				      SMB2_OP_QUERY_INFO);

fs/cifs/smb2ops.c

+3 −3
Original line number Diff line number Diff line
@@ -1562,7 +1562,7 @@ smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid, 
				 CIFS_CACHE_READ(cinode) ? 1 : 0);

}



static void

void

smb2_set_related(struct smb_rqst *rqst)

{

	struct smb2_sync_hdr *shdr;
@@ -1573,7 +1573,7 @@ smb2_set_related(struct smb_rqst *rqst) 


char smb2_padding[7] = {0, 0, 0, 0, 0, 0, 0};



static void

void

smb2_set_next_command(struct TCP_Server_Info *server, struct smb_rqst *rqst)

{

	struct smb2_sync_hdr *shdr;
@@ -1616,7 +1616,7 @@ smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon, 
		flags |= CIFS_TRANSFORM_REQ;



	memset(rqst, 0, sizeof(rqst));

	memset(resp_buftype, 0, sizeof(resp_buftype));

	resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;

	memset(rsp_iov, 0, sizeof(rsp_iov));



	memset(&open_iov, 0, sizeof(open_iov));

fs/cifs/smb2pdu.c

+7 −7
Original line number Diff line number Diff line
@@ -2627,8 +2627,8 @@ smb2_validate_iov(unsigned int offset, unsigned int buffer_length, 
 * If SMB buffer fields are valid, copy into temporary buffer to hold result.

 * Caller must free buffer.

 */

static int

validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,

int

smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,

			   struct kvec *iov, unsigned int minbufsize,

			   char *data)

{
@@ -2746,7 +2746,7 @@ query_info(const unsigned int xid, struct cifs_tcon *tcon, 
		}

	}



	rc = validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),

	rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),

					le32_to_cpu(rsp->OutputBufferLength),

					&rsp_iov, min_len, *data);

fs/cifs/smb2proto.h

+7 −0
Original line number Diff line number Diff line
@@ -116,6 +116,9 @@ extern void smb2_reconnect_server(struct work_struct *work); 
extern int smb3_crypto_aead_allocate(struct TCP_Server_Info *server);

extern unsigned long smb_rqst_len(struct TCP_Server_Info *server,

				  struct smb_rqst *rqst);

extern void smb2_set_next_command(struct TCP_Server_Info *server,

				  struct smb_rqst *rqst);

extern void smb2_set_related(struct smb_rqst *rqst);



/*

 * SMB2 Worker functions - most of protocol specific implementation details
@@ -232,6 +235,10 @@ extern enum securityEnum smb2_select_sectype(struct TCP_Server_Info *, 
extern int smb3_encryption_required(const struct cifs_tcon *tcon);

extern int smb2_validate_iov(unsigned int offset, unsigned int buffer_length,

			     struct kvec *iov, unsigned int min_buf_size);

extern int smb2_validate_and_copy_iov(unsigned int offset,

				      unsigned int buffer_length,

				      struct kvec *iov,

				      unsigned int minbufsize, char *data);

extern void smb2_copy_fs_info_to_kstatfs(

	 struct smb2_fs_full_size_info *pfs_inf,

	 struct kstatfs *kst);

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