linux/fs/cifs/smb2inode.c
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   1/*
   2 *   fs/cifs/smb2inode.c
   3 *
   4 *   Copyright (C) International Business Machines  Corp., 2002, 2011
   5 *                 Etersoft, 2012
   6 *   Author(s): Pavel Shilovsky (pshilovsky@samba.org),
   7 *              Steve French (sfrench@us.ibm.com)
   8 *
   9 *   This library is free software; you can redistribute it and/or modify
  10 *   it under the terms of the GNU Lesser General Public License as published
  11 *   by the Free Software Foundation; either version 2.1 of the License, or
  12 *   (at your option) any later version.
  13 *
  14 *   This library is distributed in the hope that it will be useful,
  15 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17 *   the GNU Lesser General Public License for more details.
  18 *
  19 *   You should have received a copy of the GNU Lesser General Public License
  20 *   along with this library; if not, write to the Free Software
  21 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22 */
  23#include <linux/fs.h>
  24#include <linux/stat.h>
  25#include <linux/slab.h>
  26#include <linux/pagemap.h>
  27#include <asm/div64.h>
  28#include "cifsfs.h"
  29#include "cifspdu.h"
  30#include "cifsglob.h"
  31#include "cifsproto.h"
  32#include "cifs_debug.h"
  33#include "cifs_fs_sb.h"
  34#include "cifs_unicode.h"
  35#include "fscache.h"
  36#include "smb2glob.h"
  37#include "smb2pdu.h"
  38#include "smb2proto.h"
  39
  40static int
  41smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
  42                   struct cifs_sb_info *cifs_sb, const char *full_path,
  43                   __u32 desired_access, __u32 create_disposition,
  44                   __u32 file_attributes, __u32 create_options,
  45                   void *data, int command)
  46{
  47        int rc, tmprc = 0;
  48        u64 persistent_fid, volatile_fid;
  49        __le16 *utf16_path;
  50        __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
  51
  52        utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
  53        if (!utf16_path)
  54                return -ENOMEM;
  55
  56        rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
  57                       desired_access, create_disposition, file_attributes,
  58                       create_options, &oplock, NULL);
  59        if (rc) {
  60                kfree(utf16_path);
  61                return rc;
  62        }
  63
  64        switch (command) {
  65        case SMB2_OP_DELETE:
  66                break;
  67        case SMB2_OP_QUERY_INFO:
  68                tmprc = SMB2_query_info(xid, tcon, persistent_fid,
  69                                        volatile_fid,
  70                                        (struct smb2_file_all_info *)data);
  71                break;
  72        case SMB2_OP_MKDIR:
  73                /*
  74                 * Directories are created through parameters in the
  75                 * SMB2_open() call.
  76                 */
  77                break;
  78        case SMB2_OP_RENAME:
  79                tmprc = SMB2_rename(xid, tcon, persistent_fid, volatile_fid,
  80                                    (__le16 *)data);
  81                break;
  82        case SMB2_OP_HARDLINK:
  83                tmprc = SMB2_set_hardlink(xid, tcon, persistent_fid,
  84                                          volatile_fid, (__le16 *)data);
  85                break;
  86        case SMB2_OP_SET_EOF:
  87                tmprc = SMB2_set_eof(xid, tcon, persistent_fid, volatile_fid,
  88                                     current->tgid, (__le64 *)data);
  89                break;
  90        case SMB2_OP_SET_INFO:
  91                tmprc = SMB2_set_info(xid, tcon, persistent_fid, volatile_fid,
  92                                      (FILE_BASIC_INFO *)data);
  93                break;
  94        default:
  95                cERROR(1, "Invalid command");
  96                break;
  97        }
  98
  99        rc = SMB2_close(xid, tcon, persistent_fid, volatile_fid);
 100        if (tmprc)
 101                rc = tmprc;
 102        kfree(utf16_path);
 103        return rc;
 104}
 105
 106void
 107move_smb2_info_to_cifs(FILE_ALL_INFO *dst, struct smb2_file_all_info *src)
 108{
 109        memcpy(dst, src, (size_t)(&src->CurrentByteOffset) - (size_t)src);
 110        dst->CurrentByteOffset = src->CurrentByteOffset;
 111        dst->Mode = src->Mode;
 112        dst->AlignmentRequirement = src->AlignmentRequirement;
 113        dst->IndexNumber1 = 0; /* we don't use it */
 114}
 115
 116int
 117smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 118                     struct cifs_sb_info *cifs_sb, const char *full_path,
 119                     FILE_ALL_INFO *data, bool *adjust_tz)
 120{
 121        int rc;
 122        struct smb2_file_all_info *smb2_data;
 123
 124        *adjust_tz = false;
 125
 126        smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
 127                            GFP_KERNEL);
 128        if (smb2_data == NULL)
 129                return -ENOMEM;
 130
 131        rc = smb2_open_op_close(xid, tcon, cifs_sb, full_path,
 132                                FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0,
 133                                smb2_data, SMB2_OP_QUERY_INFO);
 134        if (rc)
 135                goto out;
 136
 137        move_smb2_info_to_cifs(data, smb2_data);
 138out:
 139        kfree(smb2_data);
 140        return rc;
 141}
 142
 143int
 144smb2_mkdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 145           struct cifs_sb_info *cifs_sb)
 146{
 147        return smb2_open_op_close(xid, tcon, cifs_sb, name,
 148                                  FILE_WRITE_ATTRIBUTES, FILE_CREATE, 0,
 149                                  CREATE_NOT_FILE, NULL, SMB2_OP_MKDIR);
 150}
 151
 152void
 153smb2_mkdir_setinfo(struct inode *inode, const char *name,
 154                   struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
 155                   const unsigned int xid)
 156{
 157        FILE_BASIC_INFO data;
 158        struct cifsInodeInfo *cifs_i;
 159        u32 dosattrs;
 160        int tmprc;
 161
 162        memset(&data, 0, sizeof(data));
 163        cifs_i = CIFS_I(inode);
 164        dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
 165        data.Attributes = cpu_to_le32(dosattrs);
 166        tmprc = smb2_open_op_close(xid, tcon, cifs_sb, name,
 167                                   FILE_WRITE_ATTRIBUTES, FILE_CREATE, 0,
 168                                   CREATE_NOT_FILE, &data, SMB2_OP_SET_INFO);
 169        if (tmprc == 0)
 170                cifs_i->cifsAttrs = dosattrs;
 171}
 172
 173int
 174smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 175           struct cifs_sb_info *cifs_sb)
 176{
 177        return smb2_open_op_close(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 178                                  0, CREATE_NOT_FILE | CREATE_DELETE_ON_CLOSE,
 179                                  NULL, SMB2_OP_DELETE);
 180}
 181
 182int
 183smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 184            struct cifs_sb_info *cifs_sb)
 185{
 186        return smb2_open_op_close(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 187                                  0, CREATE_DELETE_ON_CLOSE, NULL,
 188                                  SMB2_OP_DELETE);
 189}
 190
 191static int
 192smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
 193                   const char *from_name, const char *to_name,
 194                   struct cifs_sb_info *cifs_sb, __u32 access, int command)
 195{
 196        __le16 *smb2_to_name = NULL;
 197        int rc;
 198
 199        smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
 200        if (smb2_to_name == NULL) {
 201                rc = -ENOMEM;
 202                goto smb2_rename_path;
 203        }
 204
 205        rc = smb2_open_op_close(xid, tcon, cifs_sb, from_name, access,
 206                                FILE_OPEN, 0, 0, smb2_to_name, command);
 207smb2_rename_path:
 208        kfree(smb2_to_name);
 209        return rc;
 210}
 211
 212int
 213smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
 214                 const char *from_name, const char *to_name,
 215                 struct cifs_sb_info *cifs_sb)
 216{
 217        return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 218                                  DELETE, SMB2_OP_RENAME);
 219}
 220
 221int
 222smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
 223                     const char *from_name, const char *to_name,
 224                     struct cifs_sb_info *cifs_sb)
 225{
 226        return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 227                                  FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK);
 228}
 229
 230int
 231smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
 232                   const char *full_path, __u64 size,
 233                   struct cifs_sb_info *cifs_sb, bool set_alloc)
 234{
 235        __le64 eof = cpu_to_le64(size);
 236        return smb2_open_op_close(xid, tcon, cifs_sb, full_path,
 237                                  FILE_WRITE_DATA, FILE_OPEN, 0, 0, &eof,
 238                                  SMB2_OP_SET_EOF);
 239}
 240
 241int
 242smb2_set_file_info(struct inode *inode, const char *full_path,
 243                   FILE_BASIC_INFO *buf, const unsigned int xid)
 244{
 245        struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 246        struct tcon_link *tlink;
 247        int rc;
 248
 249        tlink = cifs_sb_tlink(cifs_sb);
 250        if (IS_ERR(tlink))
 251                return PTR_ERR(tlink);
 252        rc = smb2_open_op_close(xid, tlink_tcon(tlink), cifs_sb, full_path,
 253                                FILE_WRITE_ATTRIBUTES, FILE_OPEN, 0, 0, buf,
 254                                SMB2_OP_SET_INFO);
 255        cifs_put_tlink(tlink);
 256        return rc;
 257}
 258
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