fs/cifs/smb2inode.c - third_party/linux - Git at Google

 /*
  *   fs/cifs/smb2inode.c
  *
  *   Copyright (C) International Business Machines  Corp., 2002, 2011
  *                 Etersoft, 2012
  *   Author(s): Pavel Shilovsky (pshilovsky@samba.org),
  *              Steve French (sfrench@us.ibm.com)
  *
  *   This library is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU Lesser General Public License as published
  *   by the Free Software Foundation; either version 2.1 of the License, or
  *   (at your option) any later version.
  *
  *   This library is distributed in the hope that it will be useful,
  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  *   the GNU Lesser General Public License for more details.
  *
  *   You should have received a copy of the GNU Lesser General Public License
  *   along with this library; if not, write to the Free Software
  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
 #include <linux/fs.h>
 #include <linux/stat.h>
 #include <linux/slab.h>
 #include <linux/pagemap.h>
 #include <asm/div64.h>
 #include "cifsfs.h"
 #include "cifspdu.h"
 #include "cifsglob.h"
 #include "cifsproto.h"
 #include "cifs_debug.h"
 #include "cifs_fs_sb.h"
 #include "cifs_unicode.h"
 #include "fscache.h"
 #include "smb2glob.h"
 #include "smb2pdu.h"
 #include "smb2proto.h"

 static void
 free_set_inf_compound(struct smb_rqst *rqst)
 {
 	if (rqst[1].rq_iov)
 		SMB2_set_info_free(&rqst[1]);
 	if (rqst[2].rq_iov)
 		SMB2_close_free(&rqst[2]);
 }


 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, umode_t mode, void *ptr, int command,
 		 struct cifsFileInfo *cfile)
 {
 	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;
 	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 si_iov[SMB2_SET_INFO_IOV_SIZE];
 	struct kvec close_iov[1];
 	struct smb2_query_info_rsp *qi_rsp = NULL;
 	int flags = 0;
 	__u8 delete_pending[8] = {1, 0, 0, 0, 0, 0, 0, 0};
 	unsigned int size[2];
 	void *data[2];
 	struct smb2_file_rename_info rename_info;
 	struct smb2_file_link_info link_info;
 	int len;

 	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));

 	/* We already have a handle so we can skip the open */
 	if (cfile)
 		goto after_open;

 	/* Open */
 	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 	if (!utf16_path) {
 		rc = -ENOMEM;
 		goto finished;
 	}

 	oparms.tcon = tcon;
 	oparms.desired_access = desired_access;
 	oparms.disposition = create_disposition;
 	oparms.create_options = cifs_create_options(cifs_sb, create_options);
 	oparms.fid = &fid;
 	oparms.reconnect = false;
 	oparms.mode = mode;

 	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(tcon, &rqst[num_rqst]);
  after_open:
 	num_rqst++;
 	rc = 0;

 	/* 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;

 		if (cfile)
 			rc = SMB2_query_info_init(tcon, &rqst[num_rqst],
 				cfile->fid.persistent_fid,
 				cfile->fid.volatile_fid,
 				FILE_ALL_INFORMATION,
 				SMB2_O_INFO_FILE, 0,
 				sizeof(struct smb2_file_all_info) +
 					  PATH_MAX * 2, 0, NULL);
 		else {
 			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, 0, NULL);
 			if (!rc) {
 				smb2_set_next_command(tcon, &rqst[num_rqst]);
 				smb2_set_related(&rqst[num_rqst]);
 			}
 		}

 		if (rc)
 			goto finished;
 		num_rqst++;
 		trace_smb3_query_info_compound_enter(xid, ses->Suid, tcon->tid,
 						     full_path);
 		break;
 	case SMB2_OP_DELETE:
 		trace_smb3_delete_enter(xid, ses->Suid, tcon->tid, full_path);
 		break;
 	case SMB2_OP_MKDIR:
 		/*
 		 * Directories are created through parameters in the
 		 * SMB2_open() call.
 		 */
 		trace_smb3_mkdir_enter(xid, ses->Suid, tcon->tid, full_path);
 		break;
 	case SMB2_OP_RMDIR:
 		memset(&si_iov, 0, sizeof(si_iov));
 		rqst[num_rqst].rq_iov = si_iov;
 		rqst[num_rqst].rq_nvec = 1;

 		size[0] = 1; /* sizeof __u8 See MS-FSCC section 2.4.11 */
 		data[0] = &delete_pending[0];

 		rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 					COMPOUND_FID, current->tgid,
 					FILE_DISPOSITION_INFORMATION,
 					SMB2_O_INFO_FILE, 0, data, size);
 		if (rc)
 			goto finished;
 		smb2_set_next_command(tcon, &rqst[num_rqst]);
 		smb2_set_related(&rqst[num_rqst++]);
 		trace_smb3_rmdir_enter(xid, ses->Suid, tcon->tid, full_path);
 		break;
 	case SMB2_OP_SET_EOF:
 		memset(&si_iov, 0, sizeof(si_iov));
 		rqst[num_rqst].rq_iov = si_iov;
 		rqst[num_rqst].rq_nvec = 1;

 		size[0] = 8; /* sizeof __le64 */
 		data[0] = ptr;

 		rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 					COMPOUND_FID, current->tgid,
 					FILE_END_OF_FILE_INFORMATION,
 					SMB2_O_INFO_FILE, 0, data, size);
 		if (rc)
 			goto finished;
 		smb2_set_next_command(tcon, &rqst[num_rqst]);
 		smb2_set_related(&rqst[num_rqst++]);
 		trace_smb3_set_eof_enter(xid, ses->Suid, tcon->tid, full_path);
 		break;
 	case SMB2_OP_SET_INFO:
 		memset(&si_iov, 0, sizeof(si_iov));
 		rqst[num_rqst].rq_iov = si_iov;
 		rqst[num_rqst].rq_nvec = 1;


 		size[0] = sizeof(FILE_BASIC_INFO);
 		data[0] = ptr;

 		if (cfile)
 			rc = SMB2_set_info_init(tcon, &rqst[num_rqst],
 				cfile->fid.persistent_fid,
 				cfile->fid.volatile_fid, current->tgid,
 				FILE_BASIC_INFORMATION,
 				SMB2_O_INFO_FILE, 0, data, size);
 		else {
 			rc = SMB2_set_info_init(tcon, &rqst[num_rqst],
 				COMPOUND_FID,
 				COMPOUND_FID, current->tgid,
 				FILE_BASIC_INFORMATION,
 				SMB2_O_INFO_FILE, 0, data, size);
 			if (!rc) {
 				smb2_set_next_command(tcon, &rqst[num_rqst]);
 				smb2_set_related(&rqst[num_rqst]);
 			}
 		}

 		if (rc)
 			goto finished;
 		num_rqst++;
 		trace_smb3_set_info_compound_enter(xid, ses->Suid, tcon->tid,
 						   full_path);
 		break;
 	case SMB2_OP_RENAME:
 		memset(&si_iov, 0, sizeof(si_iov));
 		rqst[num_rqst].rq_iov = si_iov;
 		rqst[num_rqst].rq_nvec = 2;

 		len = (2 * UniStrnlen((wchar_t *)ptr, PATH_MAX));

 		rename_info.ReplaceIfExists = 1;
 		rename_info.RootDirectory = 0;
 		rename_info.FileNameLength = cpu_to_le32(len);

 		size[0] = sizeof(struct smb2_file_rename_info);
 		data[0] = &rename_info;

 		size[1] = len + 2 /* null */;
 		data[1] = (__le16 *)ptr;

 		if (cfile)
 			rc = SMB2_set_info_init(tcon, &rqst[num_rqst],
 						cfile->fid.persistent_fid,
 						cfile->fid.volatile_fid,
 					current->tgid, FILE_RENAME_INFORMATION,
 					SMB2_O_INFO_FILE, 0, data, size);
 		else {
 			rc = SMB2_set_info_init(tcon, &rqst[num_rqst],
 					COMPOUND_FID, COMPOUND_FID,
 					current->tgid, FILE_RENAME_INFORMATION,
 					SMB2_O_INFO_FILE, 0, data, size);
 			if (!rc) {
 				smb2_set_next_command(tcon, &rqst[num_rqst]);
 				smb2_set_related(&rqst[num_rqst]);
 			}
 		}
 		if (rc)
 			goto finished;
 		num_rqst++;
 		trace_smb3_rename_enter(xid, ses->Suid, tcon->tid, full_path);
 		break;
 	case SMB2_OP_HARDLINK:
 		memset(&si_iov, 0, sizeof(si_iov));
 		rqst[num_rqst].rq_iov = si_iov;
 		rqst[num_rqst].rq_nvec = 2;

 		len = (2 * UniStrnlen((wchar_t *)ptr, PATH_MAX));

 		link_info.ReplaceIfExists = 0;
 		link_info.RootDirectory = 0;
 		link_info.FileNameLength = cpu_to_le32(len);

 		size[0] = sizeof(struct smb2_file_link_info);
 		data[0] = &link_info;

 		size[1] = len + 2 /* null */;
 		data[1] = (__le16 *)ptr;

 		rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
 					COMPOUND_FID, current->tgid,
 					FILE_LINK_INFORMATION,
 					SMB2_O_INFO_FILE, 0, data, size);
 		if (rc)
 			goto finished;
 		smb2_set_next_command(tcon, &rqst[num_rqst]);
 		smb2_set_related(&rqst[num_rqst++]);
 		trace_smb3_hardlink_enter(xid, ses->Suid, tcon->tid, full_path);
 		break;
 	default:
 		cifs_dbg(VFS, "Invalid command\n");
 		rc = -EINVAL;
 	}
 	if (rc)
 		goto finished;

 	/* We already have a handle so we can skip the close */
 	if (cfile)
 		goto after_close;
 	/* 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;
  after_close:
 	num_rqst++;

 	if (cfile) {
 		cifsFileInfo_put(cfile);
 		cfile = NULL;
 		rc = compound_send_recv(xid, ses, flags, num_rqst - 2,
 					&rqst[1], &resp_buftype[1],
 					&rsp_iov[1]);
 	} else
 		rc = compound_send_recv(xid, ses, flags, num_rqst,
 					rqst, resp_buftype,
 					rsp_iov);

  finished:
 	if (cfile)
 		cifsFileInfo_put(cfile);

 	SMB2_open_free(&rqst[0]);
 	if (rc == -EREMCHG) {
 		printk_once(KERN_WARNING "server share %s deleted\n",
 			    tcon->treeName);
 		tcon->need_reconnect = true;
 	}

 	switch (command) {
 	case SMB2_OP_QUERY_INFO:
 		if (rc == 0) {
 			qi_rsp = (struct smb2_query_info_rsp *)
 				rsp_iov[1].iov_base;
 			rc = smb2_validate_and_copy_iov(
 				le16_to_cpu(qi_rsp->OutputBufferOffset),
 				le32_to_cpu(qi_rsp->OutputBufferLength),
 				&rsp_iov[1], sizeof(struct smb2_file_all_info),
 				ptr);
 		}
 		if (rqst[1].rq_iov)
 			SMB2_query_info_free(&rqst[1]);
 		if (rqst[2].rq_iov)
 			SMB2_close_free(&rqst[2]);
 		if (rc)
 			trace_smb3_query_info_compound_err(xid,  ses->Suid,
 						tcon->tid, rc);
 		else
 			trace_smb3_query_info_compound_done(xid, ses->Suid,
 						tcon->tid);
 		break;
 	case SMB2_OP_DELETE:
 		if (rc)
 			trace_smb3_delete_err(xid,  ses->Suid, tcon->tid, rc);
 		else
 			trace_smb3_delete_done(xid, ses->Suid, tcon->tid);
 		if (rqst[1].rq_iov)
 			SMB2_close_free(&rqst[1]);
 		break;
 	case SMB2_OP_MKDIR:
 		if (rc)
 			trace_smb3_mkdir_err(xid,  ses->Suid, tcon->tid, rc);
 		else
 			trace_smb3_mkdir_done(xid, ses->Suid, tcon->tid);
 		if (rqst[1].rq_iov)
 			SMB2_close_free(&rqst[1]);
 		break;
 	case SMB2_OP_HARDLINK:
 		if (rc)
 			trace_smb3_hardlink_err(xid,  ses->Suid, tcon->tid, rc);
 		else
 			trace_smb3_hardlink_done(xid, ses->Suid, tcon->tid);
 		free_set_inf_compound(rqst);
 		break;
 	case SMB2_OP_RENAME:
 		if (rc)
 			trace_smb3_rename_err(xid,  ses->Suid, tcon->tid, rc);
 		else
 			trace_smb3_rename_done(xid, ses->Suid, tcon->tid);
 		free_set_inf_compound(rqst);
 		break;
 	case SMB2_OP_RMDIR:
 		if (rc)
 			trace_smb3_rmdir_err(xid,  ses->Suid, tcon->tid, rc);
 		else
 			trace_smb3_rmdir_done(xid, ses->Suid, tcon->tid);
 		free_set_inf_compound(rqst);
 		break;
 	case SMB2_OP_SET_EOF:
 		if (rc)
 			trace_smb3_set_eof_err(xid,  ses->Suid, tcon->tid, rc);
 		else
 			trace_smb3_set_eof_done(xid, ses->Suid, tcon->tid);
 		free_set_inf_compound(rqst);
 		break;
 	case SMB2_OP_SET_INFO:
 		if (rc)
 			trace_smb3_set_info_compound_err(xid,  ses->Suid,
 						tcon->tid, rc);
 		else
 			trace_smb3_set_info_compound_done(xid, ses->Suid,
 						tcon->tid);
 		free_set_inf_compound(rqst);
 		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;
 }

 void
 move_smb2_info_to_cifs(FILE_ALL_INFO *dst, struct smb2_file_all_info *src)
 {
 	memcpy(dst, src, (size_t)(&src->CurrentByteOffset) - (size_t)src);
 	dst->CurrentByteOffset = src->CurrentByteOffset;
 	dst->Mode = src->Mode;
 	dst->AlignmentRequirement = src->AlignmentRequirement;
 	dst->IndexNumber1 = 0; /* we don't use it */
 }

 int
 smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 		     struct cifs_sb_info *cifs_sb, const char *full_path,
 		     FILE_ALL_INFO *data, bool *adjust_tz, bool *symlink)
 {
 	int rc;
 	struct smb2_file_all_info *smb2_data;
 	__u32 create_options = 0;
 	struct cifs_fid fid;
 	bool no_cached_open = tcon->nohandlecache;
 	struct cifsFileInfo *cfile;

 	*adjust_tz = false;
 	*symlink = false;

 	smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 			    GFP_KERNEL);
 	if (smb2_data == NULL)
 		return -ENOMEM;

 	/* If it is a root and its handle is cached then use it */
 	if (!strlen(full_path) && !no_cached_open) {
 		rc = open_shroot(xid, tcon, cifs_sb, &fid);
 		if (rc)
 			goto out;

 		if (tcon->crfid.file_all_info_is_valid) {
 			move_smb2_info_to_cifs(data,
 					       &tcon->crfid.file_all_info);
 		} else {
 			rc = SMB2_query_info(xid, tcon, fid.persistent_fid,
 					     fid.volatile_fid, smb2_data);
 			if (!rc)
 				move_smb2_info_to_cifs(data, smb2_data);
 		}
 		close_shroot(&tcon->crfid);
 		goto out;
 	}

 	cifs_get_readable_path(tcon, full_path, &cfile);
 	rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
 			      FILE_READ_ATTRIBUTES, FILE_OPEN, create_options,
 			      ACL_NO_MODE, smb2_data, SMB2_OP_QUERY_INFO, cfile);
 	if (rc == -EOPNOTSUPP) {
 		*symlink = true;
 		create_options |= OPEN_REPARSE_POINT;

 		/* Failed on a symbolic link - query a reparse point info */
 		rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
 				      FILE_READ_ATTRIBUTES, FILE_OPEN,
 				      create_options, ACL_NO_MODE,
 				      smb2_data, SMB2_OP_QUERY_INFO, NULL);
 	}
 	if (rc)
 		goto out;

 	move_smb2_info_to_cifs(data, smb2_data);
 out:
 	kfree(smb2_data);
 	return rc;
 }

 int
 smb2_mkdir(const unsigned int xid, struct inode *parent_inode, umode_t mode,
 	   struct cifs_tcon *tcon, const char *name,
 	   struct cifs_sb_info *cifs_sb)
 {
 	return smb2_compound_op(xid, tcon, cifs_sb, name,
 				FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 				CREATE_NOT_FILE, mode, NULL, SMB2_OP_MKDIR,
 				NULL);
 }

 void
 smb2_mkdir_setinfo(struct inode *inode, const char *name,
 		   struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
 		   const unsigned int xid)
 {
 	FILE_BASIC_INFO data;
 	struct cifsInodeInfo *cifs_i;
 	struct cifsFileInfo *cfile;
 	u32 dosattrs;
 	int tmprc;

 	memset(&data, 0, sizeof(data));
 	cifs_i = CIFS_I(inode);
 	dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
 	data.Attributes = cpu_to_le32(dosattrs);
 	cifs_get_writable_path(tcon, name, FIND_WR_ANY, &cfile);
 	tmprc = smb2_compound_op(xid, tcon, cifs_sb, name,
 				 FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 				 CREATE_NOT_FILE, ACL_NO_MODE,
 				 &data, SMB2_OP_SET_INFO, cfile);
 	if (tmprc == 0)
 		cifs_i->cifsAttrs = dosattrs;
 }

 int
 smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 	   struct cifs_sb_info *cifs_sb)
 {
 	return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 				CREATE_NOT_FILE, ACL_NO_MODE,
 				NULL, SMB2_OP_RMDIR, NULL);
 }

 int
 smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 	    struct cifs_sb_info *cifs_sb)
 {
 	return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 				CREATE_DELETE_ON_CLOSE | OPEN_REPARSE_POINT,
 				ACL_NO_MODE, NULL, SMB2_OP_DELETE, NULL);
 }

 static int
 smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
 		   const char *from_name, const char *to_name,
 		   struct cifs_sb_info *cifs_sb, __u32 access, int command,
 		   struct cifsFileInfo *cfile)
 {
 	__le16 *smb2_to_name = NULL;
 	int rc;

 	smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
 	if (smb2_to_name == NULL) {
 		rc = -ENOMEM;
 		goto smb2_rename_path;
 	}
 	rc = smb2_compound_op(xid, tcon, cifs_sb, from_name, access,
 			      FILE_OPEN, 0, ACL_NO_MODE, smb2_to_name,
 			      command, cfile);
 smb2_rename_path:
 	kfree(smb2_to_name);
 	return rc;
 }

 int
 smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
 		 const char *from_name, const char *to_name,
 		 struct cifs_sb_info *cifs_sb)
 {
 	struct cifsFileInfo *cfile;

 	cifs_get_writable_path(tcon, from_name, FIND_WR_WITH_DELETE, &cfile);

 	return smb2_set_path_attr(xid, tcon, from_name, to_name,
 				  cifs_sb, DELETE, SMB2_OP_RENAME, cfile);
 }

 int
 smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
 		     const char *from_name, const char *to_name,
 		     struct cifs_sb_info *cifs_sb)
 {
 	return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 				  FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK,
 				  NULL);
 }

 int
 smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
 		   const char *full_path, __u64 size,
 		   struct cifs_sb_info *cifs_sb, bool set_alloc)
 {
 	__le64 eof = cpu_to_le64(size);

 	return smb2_compound_op(xid, tcon, cifs_sb, full_path,
 				FILE_WRITE_DATA, FILE_OPEN, 0, ACL_NO_MODE,
 				&eof, SMB2_OP_SET_EOF, NULL);
 }

 int
 smb2_set_file_info(struct inode *inode, const char *full_path,
 		   FILE_BASIC_INFO *buf, const unsigned int xid)
 {
 	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 	struct tcon_link *tlink;
 	int rc;

 	if ((buf->CreationTime == 0) && (buf->LastAccessTime == 0) &&
 	    (buf->LastWriteTime == 0) && (buf->ChangeTime == 0) &&
 	    (buf->Attributes == 0))
 		return 0; /* would be a no op, no sense sending this */

 	tlink = cifs_sb_tlink(cifs_sb);
 	if (IS_ERR(tlink))
 		return PTR_ERR(tlink);

 	rc = smb2_compound_op(xid, tlink_tcon(tlink), cifs_sb, full_path,
 			      FILE_WRITE_ATTRIBUTES, FILE_OPEN,
 			      0, ACL_NO_MODE, buf, SMB2_OP_SET_INFO, NULL);
 	cifs_put_tlink(tlink);
 	return rc;
 }
	/*
	* fs/cifs/smb2inode.c
	*
	* Copyright (C) International Business Machines Corp., 2002, 2011
	* Etersoft, 2012
	* Author(s): Pavel Shilovsky (pshilovsky@samba.org),
	* Steve French (sfrench@us.ibm.com)
	*
	* This library is free software; you can redistribute it and/or modify
	* it under the terms of the GNU Lesser General Public License as published
	* by the Free Software Foundation; either version 2.1 of the License, or
	* (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	* the GNU Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public License
	* along with this library; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/
	#include <linux/fs.h>
	#include <linux/stat.h>
	#include <linux/slab.h>
	#include <linux/pagemap.h>
	#include <asm/div64.h>
	#include "cifsfs.h"
	#include "cifspdu.h"
	#include "cifsglob.h"
	#include "cifsproto.h"
	#include "cifs_debug.h"
	#include "cifs_fs_sb.h"
	#include "cifs_unicode.h"
	#include "fscache.h"
	#include "smb2glob.h"
	#include "smb2pdu.h"
	#include "smb2proto.h"

	static void
	free_set_inf_compound(struct smb_rqst *rqst)
	{
	if (rqst[1].rq_iov)
	SMB2_set_info_free(&rqst[1]);
	if (rqst[2].rq_iov)
	SMB2_close_free(&rqst[2]);
	}


	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, umode_t mode, void *ptr, int command,
	struct cifsFileInfo *cfile)
	{
	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;
	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 si_iov[SMB2_SET_INFO_IOV_SIZE];
	struct kvec close_iov[1];
	struct smb2_query_info_rsp *qi_rsp = NULL;
	int flags = 0;
	__u8 delete_pending[8] = {1, 0, 0, 0, 0, 0, 0, 0};
	unsigned int size[2];
	void *data[2];
	struct smb2_file_rename_info rename_info;
	struct smb2_file_link_info link_info;
	int len;

	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));

	/* We already have a handle so we can skip the open */
	if (cfile)
	goto after_open;

	/* Open */
	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
	if (!utf16_path) {
	rc = -ENOMEM;
	goto finished;
	}

	oparms.tcon = tcon;
	oparms.desired_access = desired_access;
	oparms.disposition = create_disposition;
	oparms.create_options = cifs_create_options(cifs_sb, create_options);
	oparms.fid = &fid;
	oparms.reconnect = false;
	oparms.mode = mode;

	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(tcon, &rqst[num_rqst]);
	after_open:
	num_rqst++;
	rc = 0;

	/* 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;

	if (cfile)
	rc = SMB2_query_info_init(tcon, &rqst[num_rqst],
	cfile->fid.persistent_fid,
	cfile->fid.volatile_fid,
	FILE_ALL_INFORMATION,
	SMB2_O_INFO_FILE, 0,
	sizeof(struct smb2_file_all_info) +
	PATH_MAX * 2, 0, NULL);
	else {
	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, 0, NULL);
	if (!rc) {
	smb2_set_next_command(tcon, &rqst[num_rqst]);
	smb2_set_related(&rqst[num_rqst]);
	}
	}

	if (rc)
	goto finished;
	num_rqst++;
	trace_smb3_query_info_compound_enter(xid, ses->Suid, tcon->tid,
	full_path);
	break;
	case SMB2_OP_DELETE:
	trace_smb3_delete_enter(xid, ses->Suid, tcon->tid, full_path);
	break;
	case SMB2_OP_MKDIR:
	/*
	* Directories are created through parameters in the
	* SMB2_open() call.
	*/
	trace_smb3_mkdir_enter(xid, ses->Suid, tcon->tid, full_path);
	break;
	case SMB2_OP_RMDIR:
	memset(&si_iov, 0, sizeof(si_iov));
	rqst[num_rqst].rq_iov = si_iov;
	rqst[num_rqst].rq_nvec = 1;

	size[0] = 1; /* sizeof __u8 See MS-FSCC section 2.4.11 */
	data[0] = &delete_pending[0];

	rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
	COMPOUND_FID, current->tgid,
	FILE_DISPOSITION_INFORMATION,
	SMB2_O_INFO_FILE, 0, data, size);
	if (rc)
	goto finished;
	smb2_set_next_command(tcon, &rqst[num_rqst]);
	smb2_set_related(&rqst[num_rqst++]);
	trace_smb3_rmdir_enter(xid, ses->Suid, tcon->tid, full_path);
	break;
	case SMB2_OP_SET_EOF:
	memset(&si_iov, 0, sizeof(si_iov));
	rqst[num_rqst].rq_iov = si_iov;
	rqst[num_rqst].rq_nvec = 1;

	size[0] = 8; /* sizeof __le64 */
	data[0] = ptr;

	rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
	COMPOUND_FID, current->tgid,
	FILE_END_OF_FILE_INFORMATION,
	SMB2_O_INFO_FILE, 0, data, size);
	if (rc)
	goto finished;
	smb2_set_next_command(tcon, &rqst[num_rqst]);
	smb2_set_related(&rqst[num_rqst++]);
	trace_smb3_set_eof_enter(xid, ses->Suid, tcon->tid, full_path);
	break;
	case SMB2_OP_SET_INFO:
	memset(&si_iov, 0, sizeof(si_iov));
	rqst[num_rqst].rq_iov = si_iov;
	rqst[num_rqst].rq_nvec = 1;


	size[0] = sizeof(FILE_BASIC_INFO);
	data[0] = ptr;

	if (cfile)
	rc = SMB2_set_info_init(tcon, &rqst[num_rqst],
	cfile->fid.persistent_fid,
	cfile->fid.volatile_fid, current->tgid,
	FILE_BASIC_INFORMATION,
	SMB2_O_INFO_FILE, 0, data, size);
	else {
	rc = SMB2_set_info_init(tcon, &rqst[num_rqst],
	COMPOUND_FID,
	COMPOUND_FID, current->tgid,
	FILE_BASIC_INFORMATION,
	SMB2_O_INFO_FILE, 0, data, size);
	if (!rc) {
	smb2_set_next_command(tcon, &rqst[num_rqst]);
	smb2_set_related(&rqst[num_rqst]);
	}
	}

	if (rc)
	goto finished;
	num_rqst++;
	trace_smb3_set_info_compound_enter(xid, ses->Suid, tcon->tid,
	full_path);
	break;
	case SMB2_OP_RENAME:
	memset(&si_iov, 0, sizeof(si_iov));
	rqst[num_rqst].rq_iov = si_iov;
	rqst[num_rqst].rq_nvec = 2;

	len = (2 * UniStrnlen((wchar_t *)ptr, PATH_MAX));

	rename_info.ReplaceIfExists = 1;
	rename_info.RootDirectory = 0;
	rename_info.FileNameLength = cpu_to_le32(len);

	size[0] = sizeof(struct smb2_file_rename_info);
	data[0] = &rename_info;

	size[1] = len + 2 /* null */;
	data[1] = (__le16 *)ptr;

	if (cfile)
	rc = SMB2_set_info_init(tcon, &rqst[num_rqst],
	cfile->fid.persistent_fid,
	cfile->fid.volatile_fid,
	current->tgid, FILE_RENAME_INFORMATION,
	SMB2_O_INFO_FILE, 0, data, size);
	else {
	rc = SMB2_set_info_init(tcon, &rqst[num_rqst],
	COMPOUND_FID, COMPOUND_FID,
	current->tgid, FILE_RENAME_INFORMATION,
	SMB2_O_INFO_FILE, 0, data, size);
	if (!rc) {
	smb2_set_next_command(tcon, &rqst[num_rqst]);
	smb2_set_related(&rqst[num_rqst]);
	}
	}
	if (rc)
	goto finished;
	num_rqst++;
	trace_smb3_rename_enter(xid, ses->Suid, tcon->tid, full_path);
	break;
	case SMB2_OP_HARDLINK:
	memset(&si_iov, 0, sizeof(si_iov));
	rqst[num_rqst].rq_iov = si_iov;
	rqst[num_rqst].rq_nvec = 2;

	len = (2 * UniStrnlen((wchar_t *)ptr, PATH_MAX));

	link_info.ReplaceIfExists = 0;
	link_info.RootDirectory = 0;
	link_info.FileNameLength = cpu_to_le32(len);

	size[0] = sizeof(struct smb2_file_link_info);
	data[0] = &link_info;

	size[1] = len + 2 /* null */;
	data[1] = (__le16 *)ptr;

	rc = SMB2_set_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
	COMPOUND_FID, current->tgid,
	FILE_LINK_INFORMATION,
	SMB2_O_INFO_FILE, 0, data, size);
	if (rc)
	goto finished;
	smb2_set_next_command(tcon, &rqst[num_rqst]);
	smb2_set_related(&rqst[num_rqst++]);
	trace_smb3_hardlink_enter(xid, ses->Suid, tcon->tid, full_path);
	break;
	default:
	cifs_dbg(VFS, "Invalid command\n");
	rc = -EINVAL;
	}
	if (rc)
	goto finished;

	/* We already have a handle so we can skip the close */
	if (cfile)
	goto after_close;
	/* 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;
	after_close:
	num_rqst++;

	if (cfile) {
	cifsFileInfo_put(cfile);
	cfile = NULL;
	rc = compound_send_recv(xid, ses, flags, num_rqst - 2,
	&rqst[1], &resp_buftype[1],
	&rsp_iov[1]);
	} else
	rc = compound_send_recv(xid, ses, flags, num_rqst,
	rqst, resp_buftype,
	rsp_iov);

	finished:
	if (cfile)
	cifsFileInfo_put(cfile);

	SMB2_open_free(&rqst[0]);
	if (rc == -EREMCHG) {
	printk_once(KERN_WARNING "server share %s deleted\n",
	tcon->treeName);
	tcon->need_reconnect = true;
	}

	switch (command) {
	case SMB2_OP_QUERY_INFO:
	if (rc == 0) {
	qi_rsp = (struct smb2_query_info_rsp *)
	rsp_iov[1].iov_base;
	rc = smb2_validate_and_copy_iov(
	le16_to_cpu(qi_rsp->OutputBufferOffset),
	le32_to_cpu(qi_rsp->OutputBufferLength),
	&rsp_iov[1], sizeof(struct smb2_file_all_info),
	ptr);
	}
	if (rqst[1].rq_iov)
	SMB2_query_info_free(&rqst[1]);
	if (rqst[2].rq_iov)
	SMB2_close_free(&rqst[2]);
	if (rc)
	trace_smb3_query_info_compound_err(xid, ses->Suid,
	tcon->tid, rc);
	else
	trace_smb3_query_info_compound_done(xid, ses->Suid,
	tcon->tid);
	break;
	case SMB2_OP_DELETE:
	if (rc)
	trace_smb3_delete_err(xid, ses->Suid, tcon->tid, rc);
	else
	trace_smb3_delete_done(xid, ses->Suid, tcon->tid);
	if (rqst[1].rq_iov)
	SMB2_close_free(&rqst[1]);
	break;
	case SMB2_OP_MKDIR:
	if (rc)
	trace_smb3_mkdir_err(xid, ses->Suid, tcon->tid, rc);
	else
	trace_smb3_mkdir_done(xid, ses->Suid, tcon->tid);
	if (rqst[1].rq_iov)
	SMB2_close_free(&rqst[1]);
	break;
	case SMB2_OP_HARDLINK:
	if (rc)
	trace_smb3_hardlink_err(xid, ses->Suid, tcon->tid, rc);
	else
	trace_smb3_hardlink_done(xid, ses->Suid, tcon->tid);
	free_set_inf_compound(rqst);
	break;
	case SMB2_OP_RENAME:
	if (rc)
	trace_smb3_rename_err(xid, ses->Suid, tcon->tid, rc);
	else
	trace_smb3_rename_done(xid, ses->Suid, tcon->tid);
	free_set_inf_compound(rqst);
	break;
	case SMB2_OP_RMDIR:
	if (rc)
	trace_smb3_rmdir_err(xid, ses->Suid, tcon->tid, rc);
	else
	trace_smb3_rmdir_done(xid, ses->Suid, tcon->tid);
	free_set_inf_compound(rqst);
	break;
	case SMB2_OP_SET_EOF:
	if (rc)
	trace_smb3_set_eof_err(xid, ses->Suid, tcon->tid, rc);
	else
	trace_smb3_set_eof_done(xid, ses->Suid, tcon->tid);
	free_set_inf_compound(rqst);
	break;
	case SMB2_OP_SET_INFO:
	if (rc)
	trace_smb3_set_info_compound_err(xid, ses->Suid,
	tcon->tid, rc);
	else
	trace_smb3_set_info_compound_done(xid, ses->Suid,
	tcon->tid);
	free_set_inf_compound(rqst);
	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;
	}

	void
	move_smb2_info_to_cifs(FILE_ALL_INFO dst, struct smb2_file_all_info src)
	{
	memcpy(dst, src, (size_t)(&src->CurrentByteOffset) - (size_t)src);
	dst->CurrentByteOffset = src->CurrentByteOffset;
	dst->Mode = src->Mode;
	dst->AlignmentRequirement = src->AlignmentRequirement;
	dst->IndexNumber1 = 0; /* we don't use it */
	}

	int
	smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
	struct cifs_sb_info cifs_sb, const char full_path,
	FILE_ALL_INFO data, bool adjust_tz, bool *symlink)
	{
	int rc;
	struct smb2_file_all_info *smb2_data;
	__u32 create_options = 0;
	struct cifs_fid fid;
	bool no_cached_open = tcon->nohandlecache;
	struct cifsFileInfo *cfile;

	*adjust_tz = false;
	*symlink = false;

	smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
	GFP_KERNEL);
	if (smb2_data == NULL)
	return -ENOMEM;

	/* If it is a root and its handle is cached then use it */
	if (!strlen(full_path) && !no_cached_open) {
	rc = open_shroot(xid, tcon, cifs_sb, &fid);
	if (rc)
	goto out;

	if (tcon->crfid.file_all_info_is_valid) {
	move_smb2_info_to_cifs(data,
	&tcon->crfid.file_all_info);
	} else {
	rc = SMB2_query_info(xid, tcon, fid.persistent_fid,
	fid.volatile_fid, smb2_data);
	if (!rc)
	move_smb2_info_to_cifs(data, smb2_data);
	}
	close_shroot(&tcon->crfid);
	goto out;
	}

	cifs_get_readable_path(tcon, full_path, &cfile);
	rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
	FILE_READ_ATTRIBUTES, FILE_OPEN, create_options,
	ACL_NO_MODE, smb2_data, SMB2_OP_QUERY_INFO, cfile);
	if (rc == -EOPNOTSUPP) {
	*symlink = true;
	create_options \|= OPEN_REPARSE_POINT;

	/* Failed on a symbolic link - query a reparse point info */
	rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
	FILE_READ_ATTRIBUTES, FILE_OPEN,
	create_options, ACL_NO_MODE,
	smb2_data, SMB2_OP_QUERY_INFO, NULL);
	}
	if (rc)
	goto out;

	move_smb2_info_to_cifs(data, smb2_data);
	out:
	kfree(smb2_data);
	return rc;
	}

	int
	smb2_mkdir(const unsigned int xid, struct inode *parent_inode, umode_t mode,
	struct cifs_tcon tcon, const char name,
	struct cifs_sb_info *cifs_sb)
	{
	return smb2_compound_op(xid, tcon, cifs_sb, name,
	FILE_WRITE_ATTRIBUTES, FILE_CREATE,
	CREATE_NOT_FILE, mode, NULL, SMB2_OP_MKDIR,
	NULL);
	}

	void
	smb2_mkdir_setinfo(struct inode inode, const char name,
	struct cifs_sb_info cifs_sb, struct cifs_tcon tcon,
	const unsigned int xid)
	{
	FILE_BASIC_INFO data;
	struct cifsInodeInfo *cifs_i;
	struct cifsFileInfo *cfile;
	u32 dosattrs;
	int tmprc;

	memset(&data, 0, sizeof(data));
	cifs_i = CIFS_I(inode);
	dosattrs = cifs_i->cifsAttrs \| ATTR_READONLY;
	data.Attributes = cpu_to_le32(dosattrs);
	cifs_get_writable_path(tcon, name, FIND_WR_ANY, &cfile);
	tmprc = smb2_compound_op(xid, tcon, cifs_sb, name,
	FILE_WRITE_ATTRIBUTES, FILE_CREATE,
	CREATE_NOT_FILE, ACL_NO_MODE,
	&data, SMB2_OP_SET_INFO, cfile);
	if (tmprc == 0)
	cifs_i->cifsAttrs = dosattrs;
	}

	int
	smb2_rmdir(const unsigned int xid, struct cifs_tcon tcon, const char name,
	struct cifs_sb_info *cifs_sb)
	{
	return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
	CREATE_NOT_FILE, ACL_NO_MODE,
	NULL, SMB2_OP_RMDIR, NULL);
	}

	int
	smb2_unlink(const unsigned int xid, struct cifs_tcon tcon, const char name,
	struct cifs_sb_info *cifs_sb)
	{
	return smb2_compound_op(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
	CREATE_DELETE_ON_CLOSE \| OPEN_REPARSE_POINT,
	ACL_NO_MODE, NULL, SMB2_OP_DELETE, NULL);
	}

	static int
	smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
	const char from_name, const char to_name,
	struct cifs_sb_info *cifs_sb, __u32 access, int command,
	struct cifsFileInfo *cfile)
	{
	__le16 *smb2_to_name = NULL;
	int rc;

	smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
	if (smb2_to_name == NULL) {
	rc = -ENOMEM;
	goto smb2_rename_path;
	}
	rc = smb2_compound_op(xid, tcon, cifs_sb, from_name, access,
	FILE_OPEN, 0, ACL_NO_MODE, smb2_to_name,
	command, cfile);
	smb2_rename_path:
	kfree(smb2_to_name);
	return rc;
	}

	int
	smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
	const char from_name, const char to_name,
	struct cifs_sb_info *cifs_sb)
	{
	struct cifsFileInfo *cfile;

	cifs_get_writable_path(tcon, from_name, FIND_WR_WITH_DELETE, &cfile);

	return smb2_set_path_attr(xid, tcon, from_name, to_name,
	cifs_sb, DELETE, SMB2_OP_RENAME, cfile);
	}

	int
	smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
	const char from_name, const char to_name,
	struct cifs_sb_info *cifs_sb)
	{
	return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
	FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK,
	NULL);
	}

	int
	smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
	const char *full_path, __u64 size,
	struct cifs_sb_info *cifs_sb, bool set_alloc)
	{
	__le64 eof = cpu_to_le64(size);

	return smb2_compound_op(xid, tcon, cifs_sb, full_path,
	FILE_WRITE_DATA, FILE_OPEN, 0, ACL_NO_MODE,
	&eof, SMB2_OP_SET_EOF, NULL);
	}

	int
	smb2_set_file_info(struct inode inode, const char full_path,
	FILE_BASIC_INFO *buf, const unsigned int xid)
	{
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct tcon_link *tlink;
	int rc;

	if ((buf->CreationTime == 0) && (buf->LastAccessTime == 0) &&
	(buf->LastWriteTime == 0) && (buf->ChangeTime == 0) &&
	(buf->Attributes == 0))
	return 0; /* would be a no op, no sense sending this */

	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
	return PTR_ERR(tlink);

	rc = smb2_compound_op(xid, tlink_tcon(tlink), cifs_sb, full_path,
	FILE_WRITE_ATTRIBUTES, FILE_OPEN,
	0, ACL_NO_MODE, buf, SMB2_OP_SET_INFO, NULL);
	cifs_put_tlink(tlink);
	return rc;
	}