/*
 *   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;
	}

	memset(&oparms, 0, sizeof(struct cifs_open_parms));
	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, false);
	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, &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, &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;
}