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 == false)
 124                 rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 125         if (tmprc)
 126                 rc = tmprc;
 127         kfree(utf16_path);
 128         return rc;
 129 }
 130
 131 void
 132 move_smb2_info_to_cifs(FILE_ALL_INFO *dst, struct smb2_file_all_info *src)
 133 {
 134         memcpy(dst, src, (size_t)(&src->CurrentByteOffset) - (size_t)src);
 135         dst->CurrentByteOffset = src->CurrentByteOffset;
 136         dst->Mode = src->Mode;
 137         dst->AlignmentRequirement = src->AlignmentRequirement;
 138         dst->IndexNumber1 = 0; /* we don't use it */
 139 }
 140
 141 int
 142 smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 143                      struct cifs_sb_info *cifs_sb, const char *full_path,
 144                      FILE_ALL_INFO *data, bool *adjust_tz, bool *symlink)
 145 {
 146         int rc;
 147         struct smb2_file_all_info *smb2_data;
 148
 149         *adjust_tz = false;
 150         *symlink = false;
 151
 152         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 153                             GFP_KERNEL);
 154         if (smb2_data == NULL)
 155                 return -ENOMEM;
 156
 157         rc = smb2_open_op_close(xid, tcon, cifs_sb, full_path,
 158                                 FILE_READ_ATTRIBUTES, FILE_OPEN, 0,
 159                                 smb2_data, SMB2_OP_QUERY_INFO);
 160         if (rc == -EOPNOTSUPP) {
 161                 *symlink = true;
 162                 /* Failed on a symbolic link - query a reparse point info */
 163                 rc = smb2_open_op_close(xid, tcon, cifs_sb, full_path,
 164                                         FILE_READ_ATTRIBUTES, FILE_OPEN,
 165                                         OPEN_REPARSE_POINT, smb2_data,
 166                                         SMB2_OP_QUERY_INFO);
 167         }
 168         if (rc)
 169                 goto out;
 170
 171         move_smb2_info_to_cifs(data, smb2_data);
 172 out:
 173         kfree(smb2_data);
 174         return rc;
 175 }
 176
 177 int
 178 smb2_mkdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 179            struct cifs_sb_info *cifs_sb)
 180 {
 181         return smb2_open_op_close(xid, tcon, cifs_sb, name,
 182                                   FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 183                                   CREATE_NOT_FILE, NULL, SMB2_OP_MKDIR);
 184 }
 185
 186 void
 187 smb2_mkdir_setinfo(struct inode *inode, const char *name,
 188                    struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
 189                    const unsigned int xid)
 190 {
 191         FILE_BASIC_INFO data;
 192         struct cifsInodeInfo *cifs_i;
 193         u32 dosattrs;
 194         int tmprc;
 195
 196         memset(&data, 0, sizeof(data));
 197         cifs_i = CIFS_I(inode);
 198         dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
 199         data.Attributes = cpu_to_le32(dosattrs);
 200         tmprc = smb2_open_op_close(xid, tcon, cifs_sb, name,
 201                                    FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 202                                    CREATE_NOT_FILE, &data, SMB2_OP_SET_INFO);
 203         if (tmprc == 0)
 204                 cifs_i->cifsAttrs = dosattrs;
 205 }
 206
 207 int
 208 smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 209            struct cifs_sb_info *cifs_sb)
 210 {
 211         return smb2_open_op_close(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 212                                   CREATE_NOT_FILE,
 213                                   NULL, SMB2_OP_RMDIR);
 214 }
 215
 216 int
 217 smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 218             struct cifs_sb_info *cifs_sb)
 219 {
 220         return smb2_open_op_close(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 221                                   CREATE_DELETE_ON_CLOSE | OPEN_REPARSE_POINT,
 222                                   NULL, SMB2_OP_DELETE);
 223 }
 224
 225 static int
 226 smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
 227                    const char *from_name, const char *to_name,
 228                    struct cifs_sb_info *cifs_sb, __u32 access, int command)
 229 {
 230         __le16 *smb2_to_name = NULL;
 231         int rc;
 232
 233         smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
 234         if (smb2_to_name == NULL) {
 235                 rc = -ENOMEM;
 236                 goto smb2_rename_path;
 237         }
 238
 239         rc = smb2_open_op_close(xid, tcon, cifs_sb, from_name, access,
 240                                 FILE_OPEN, 0, smb2_to_name, command);
 241 smb2_rename_path:
 242         kfree(smb2_to_name);
 243         return rc;
 244 }
 245
 246 int
 247 smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
 248                  const char *from_name, const char *to_name,
 249                  struct cifs_sb_info *cifs_sb)
 250 {
 251         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 252                                   DELETE, SMB2_OP_RENAME);
 253 }
 254
 255 int
 256 smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
 257                      const char *from_name, const char *to_name,
 258                      struct cifs_sb_info *cifs_sb)
 259 {
 260         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 261                                   FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK);
 262 }
 263
 264 int
 265 smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
 266                    const char *full_path, __u64 size,
 267                    struct cifs_sb_info *cifs_sb, bool set_alloc)
 268 {
 269         __le64 eof = cpu_to_le64(size);
 270         return smb2_open_op_close(xid, tcon, cifs_sb, full_path,
 271                                   FILE_WRITE_DATA, FILE_OPEN, 0, &eof,
 272                                   SMB2_OP_SET_EOF);
 273 }
 274
 275 int
 276 smb2_set_file_info(struct inode *inode, const char *full_path,
 277                    FILE_BASIC_INFO *buf, const unsigned int xid)
 278 {
 279         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 280         struct tcon_link *tlink;
 281         int rc;
 282
 283         if ((buf->CreationTime == 0) && (buf->LastAccessTime == 0) &&
 284             (buf->LastWriteTime == 0) && (buf->ChangeTime) &&
 285             (buf->Attributes == 0))
 286                 return 0; /* would be a no op, no sense sending this */
 287
 288         tlink = cifs_sb_tlink(cifs_sb);
 289         if (IS_ERR(tlink))
 290                 return PTR_ERR(tlink);
 291
 292         rc = smb2_open_op_close(xid, tlink_tcon(tlink), cifs_sb, full_path,
 293                                 FILE_WRITE_ATTRIBUTES, FILE_OPEN, 0, buf,
 294                                 SMB2_OP_SET_INFO);
 295         cifs_put_tlink(tlink);
 296         return rc;
 297 }