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