fs/cifs/smb2inode.c

   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
  40 static int
  41 smb2_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 create_options, void *data, int command)
  45 {
  46         int rc, tmprc = 0;
  47         __le16 *utf16_path = NULL;
  48         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
  49         struct cifs_open_parms oparms;
  50         struct cifs_fid fid;
  51         bool use_cached_root_handle = false;
  52
  53         if ((strcmp(full_path, "") == 0) && (create_options == 0) &&
  54             (desired_access == FILE_READ_ATTRIBUTES) &&
  55             (create_disposition == FILE_OPEN) &&
  56             (tcon->nohandlecache == false)) {
  57                 rc = open_shroot(xid, tcon, &fid);
  58                 if (rc == 0)
  59                         use_cached_root_handle = true;
  60         }
  61
  62         if (use_cached_root_handle == false) {
  63                 utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
  64                 if (!utf16_path)
  65                         return -ENOMEM;
  66
  67                 oparms.tcon = tcon;
  68                 oparms.desired_access = desired_access;
  69                 oparms.disposition = create_disposition;
  70                 oparms.create_options = create_options;
  71                 oparms.fid = &fid;
  72                 oparms.reconnect = false;
  73
  74                 rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
  75                                NULL);
  76                 if (rc) {
  77                         kfree(utf16_path);
  78                         return rc;
  79                 }
  80         }
  81
  82         switch (command) {
  83         case SMB2_OP_DELETE:
  84                 break;
  85         case SMB2_OP_QUERY_INFO:
  86                 tmprc = SMB2_query_info(xid, tcon, fid.persistent_fid,
  87                                         fid.volatile_fid,
  88                                         (struct smb2_file_all_info *)data);
  89                 break;
  90         case SMB2_OP_MKDIR:
  91                 /*
  92                  * Directories are created through parameters in the
  93                  * SMB2_open() call.
  94                  */
  95                 break;
  96         case SMB2_OP_RMDIR:
  97                 tmprc = SMB2_rmdir(xid, tcon, fid.persistent_fid,
  98                                    fid.volatile_fid);
  99                 break;
 100         case SMB2_OP_RENAME:
 101                 tmprc = SMB2_rename(xid, tcon, fid.persistent_fid,
 102                                     fid.volatile_fid, (__le16 *)data);
 103                 break;
 104         case SMB2_OP_HARDLINK:
 105                 tmprc = SMB2_set_hardlink(xid, tcon, fid.persistent_fid,
 106                                           fid.volatile_fid, (__le16 *)data);
 107                 break;
 108         case SMB2_OP_SET_EOF:
 109                 tmprc = SMB2_set_eof(xid, tcon, fid.persistent_fid,
 110                                      fid.volatile_fid, current->tgid,
 111                                      (__le64 *)data, false);
 112                 break;
 113         case SMB2_OP_SET_INFO:
 114                 tmprc = SMB2_set_info(xid, tcon, fid.persistent_fid,
 115                                       fid.volatile_fid,
 116                                       (FILE_BASIC_INFO *)data);
 117                 break;
 118         default:
 119                 cifs_dbg(VFS, "Invalid command\n");
 120                 break;
 121         }
 122
 123         if (use_cached_root_handle)
 124                 close_shroot(&tcon->crfid);
 125         else
 126                 rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 127         if (tmprc)
 128                 rc = tmprc;
 129         kfree(utf16_path);
 130         return rc;
 131 }
 132
 133 void
 134 move_smb2_info_to_cifs(FILE_ALL_INFO *dst, struct smb2_file_all_info *src)
 135 {
 136         memcpy(dst, src, (size_t)(&src->CurrentByteOffset) - (size_t)src);
 137         dst->CurrentByteOffset = src->CurrentByteOffset;
 138         dst->Mode = src->Mode;
 139         dst->AlignmentRequirement = src->AlignmentRequirement;
 140         dst->IndexNumber1 = 0; /* we don't use it */
 141 }
 142
 143 int
 144 smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 145                      struct cifs_sb_info *cifs_sb, const char *full_path,
 146                      FILE_ALL_INFO *data, bool *adjust_tz, bool *symlink)
 147 {
 148         int rc;
 149         struct smb2_file_all_info *smb2_data;
 150
 151         *adjust_tz = false;
 152         *symlink = false;
 153
 154         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 155                             GFP_KERNEL);
 156         if (smb2_data == NULL)
 157                 return -ENOMEM;
 158
 159         rc = smb2_open_op_close(xid, tcon, cifs_sb, full_path,
 160                                 FILE_READ_ATTRIBUTES, FILE_OPEN, 0,
 161                                 smb2_data, SMB2_OP_QUERY_INFO);
 162         if (rc == -EOPNOTSUPP) {
 163                 *symlink = true;
 164                 /* Failed on a symbolic link - query a reparse point info */
 165                 rc = smb2_open_op_close(xid, tcon, cifs_sb, full_path,
 166                                         FILE_READ_ATTRIBUTES, FILE_OPEN,
 167                                         OPEN_REPARSE_POINT, smb2_data,
 168                                         SMB2_OP_QUERY_INFO);
 169         }
 170         if (rc)
 171                 goto out;
 172
 173         move_smb2_info_to_cifs(data, smb2_data);
 174 out:
 175         kfree(smb2_data);
 176         return rc;
 177 }
 178
 179 int
 180 smb2_mkdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 181            struct cifs_sb_info *cifs_sb)
 182 {
 183         return smb2_open_op_close(xid, tcon, cifs_sb, name,
 184                                   FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 185                                   CREATE_NOT_FILE, NULL, SMB2_OP_MKDIR);
 186 }
 187
 188 void
 189 smb2_mkdir_setinfo(struct inode *inode, const char *name,
 190                    struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
 191                    const unsigned int xid)
 192 {
 193         FILE_BASIC_INFO data;
 194         struct cifsInodeInfo *cifs_i;
 195         u32 dosattrs;
 196         int tmprc;
 197
 198         memset(&data, 0, sizeof(data));
 199         cifs_i = CIFS_I(inode);
 200         dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
 201         data.Attributes = cpu_to_le32(dosattrs);
 202         tmprc = smb2_open_op_close(xid, tcon, cifs_sb, name,
 203                                    FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 204                                    CREATE_NOT_FILE, &data, SMB2_OP_SET_INFO);
 205         if (tmprc == 0)
 206                 cifs_i->cifsAttrs = dosattrs;
 207 }
 208
 209 int
 210 smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 211            struct cifs_sb_info *cifs_sb)
 212 {
 213         return smb2_open_op_close(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 214                                   CREATE_NOT_FILE,
 215                                   NULL, SMB2_OP_RMDIR);
 216 }
 217
 218 int
 219 smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 220             struct cifs_sb_info *cifs_sb)
 221 {
 222         return smb2_open_op_close(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 223                                   CREATE_DELETE_ON_CLOSE | OPEN_REPARSE_POINT,
 224                                   NULL, SMB2_OP_DELETE);
 225 }
 226
 227 static int
 228 smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
 229                    const char *from_name, const char *to_name,
 230                    struct cifs_sb_info *cifs_sb, __u32 access, int command)
 231 {
 232         __le16 *smb2_to_name = NULL;
 233         int rc;
 234
 235         smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
 236         if (smb2_to_name == NULL) {
 237                 rc = -ENOMEM;
 238                 goto smb2_rename_path;
 239         }
 240
 241         rc = smb2_open_op_close(xid, tcon, cifs_sb, from_name, access,
 242                                 FILE_OPEN, 0, smb2_to_name, command);
 243 smb2_rename_path:
 244         kfree(smb2_to_name);
 245         return rc;
 246 }
 247
 248 int
 249 smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
 250                  const char *from_name, const char *to_name,
 251                  struct cifs_sb_info *cifs_sb)
 252 {
 253         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 254                                   DELETE, SMB2_OP_RENAME);
 255 }
 256
 257 int
 258 smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
 259                      const char *from_name, const char *to_name,
 260                      struct cifs_sb_info *cifs_sb)
 261 {
 262         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 263                                   FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK);
 264 }
 265
 266 int
 267 smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
 268                    const char *full_path, __u64 size,
 269                    struct cifs_sb_info *cifs_sb, bool set_alloc)
 270 {
 271         __le64 eof = cpu_to_le64(size);
 272         return smb2_open_op_close(xid, tcon, cifs_sb, full_path,
 273                                   FILE_WRITE_DATA, FILE_OPEN, 0, &eof,
 274                                   SMB2_OP_SET_EOF);
 275 }
 276
 277 int
 278 smb2_set_file_info(struct inode *inode, const char *full_path,
 279                    FILE_BASIC_INFO *buf, const unsigned int xid)
 280 {
 281         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 282         struct tcon_link *tlink;
 283         int rc;
 284
 285         if ((buf->CreationTime == 0) && (buf->LastAccessTime == 0) &&
 286             (buf->LastWriteTime == 0) && (buf->ChangeTime == 0) &&
 287             (buf->Attributes == 0))
 288                 return 0; /* would be a no op, no sense sending this */
 289
 290         tlink = cifs_sb_tlink(cifs_sb);
 291         if (IS_ERR(tlink))
 292                 return PTR_ERR(tlink);
 293
 294         rc = smb2_open_op_close(xid, tlink_tcon(tlink), cifs_sb, full_path,
 295                                 FILE_WRITE_ATTRIBUTES, FILE_OPEN, 0, buf,
 296                                 SMB2_OP_SET_INFO);
 297         cifs_put_tlink(tlink);
 298         return rc;
 299 }