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