kernel/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_RENAME:
  84                 tmprc = SMB2_rename(xid, tcon, fid.persistent_fid,
  85                                     fid.volatile_fid, (__le16 *)data);
  86                 break;
  87         case SMB2_OP_HARDLINK:
  88                 tmprc = SMB2_set_hardlink(xid, tcon, fid.persistent_fid,
  89                                           fid.volatile_fid, (__le16 *)data);
  90                 break;
  91         case SMB2_OP_SET_EOF:
  92                 tmprc = SMB2_set_eof(xid, tcon, fid.persistent_fid,
  93                                      fid.volatile_fid, current->tgid,
  94                                      (__le64 *)data, false);
  95                 break;
  96         case SMB2_OP_SET_INFO:
  97                 tmprc = SMB2_set_info(xid, tcon, fid.persistent_fid,
  98                                       fid.volatile_fid,
  99                                       (FILE_BASIC_INFO *)data);
 100                 break;
 101         default:
 102                 cifs_dbg(VFS, "Invalid command\n");
 103                 break;
 104         }
 105
 106         rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 107         if (tmprc)
 108                 rc = tmprc;
 109         kfree(utf16_path);
 110         return rc;
 111 }
 112
 113 void
 114 move_smb2_info_to_cifs(FILE_ALL_INFO *dst, struct smb2_file_all_info *src)
 115 {
 116         memcpy(dst, src, (size_t)(&src->CurrentByteOffset) - (size_t)src);
 117         dst->CurrentByteOffset = src->CurrentByteOffset;
 118         dst->Mode = src->Mode;
 119         dst->AlignmentRequirement = src->AlignmentRequirement;
 120         dst->IndexNumber1 = 0; /* we don't use it */
 121 }
 122
 123 int
 124 smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 125                      struct cifs_sb_info *cifs_sb, const char *full_path,
 126                      FILE_ALL_INFO *data, bool *adjust_tz, bool *symlink)
 127 {
 128         int rc;
 129         struct smb2_file_all_info *smb2_data;
 130
 131         *adjust_tz = false;
 132         *symlink = false;
 133
 134         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 135                             GFP_KERNEL);
 136         if (smb2_data == NULL)
 137                 return -ENOMEM;
 138
 139         rc = smb2_open_op_close(xid, tcon, cifs_sb, full_path,
 140                                 FILE_READ_ATTRIBUTES, FILE_OPEN, 0,
 141                                 smb2_data, SMB2_OP_QUERY_INFO);
 142         if (rc == -EOPNOTSUPP) {
 143                 *symlink = true;
 144                 /* Failed on a symbolic link - query a reparse point info */
 145                 rc = smb2_open_op_close(xid, tcon, cifs_sb, full_path,
 146                                         FILE_READ_ATTRIBUTES, FILE_OPEN,
 147                                         OPEN_REPARSE_POINT, smb2_data,
 148                                         SMB2_OP_QUERY_INFO);
 149         }
 150         if (rc)
 151                 goto out;
 152
 153         move_smb2_info_to_cifs(data, smb2_data);
 154 out:
 155         kfree(smb2_data);
 156         return rc;
 157 }
 158
 159 int
 160 smb2_mkdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 161            struct cifs_sb_info *cifs_sb)
 162 {
 163         return smb2_open_op_close(xid, tcon, cifs_sb, name,
 164                                   FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 165                                   CREATE_NOT_FILE, NULL, SMB2_OP_MKDIR);
 166 }
 167
 168 void
 169 smb2_mkdir_setinfo(struct inode *inode, const char *name,
 170                    struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
 171                    const unsigned int xid)
 172 {
 173         FILE_BASIC_INFO data;
 174         struct cifsInodeInfo *cifs_i;
 175         u32 dosattrs;
 176         int tmprc;
 177
 178         memset(&data, 0, sizeof(data));
 179         cifs_i = CIFS_I(inode);
 180         dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
 181         data.Attributes = cpu_to_le32(dosattrs);
 182         tmprc = smb2_open_op_close(xid, tcon, cifs_sb, name,
 183                                    FILE_WRITE_ATTRIBUTES, FILE_CREATE,
 184                                    CREATE_NOT_FILE, &data, SMB2_OP_SET_INFO);
 185         if (tmprc == 0)
 186                 cifs_i->cifsAttrs = dosattrs;
 187 }
 188
 189 int
 190 smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 191            struct cifs_sb_info *cifs_sb)
 192 {
 193         return smb2_open_op_close(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 194                                   CREATE_NOT_FILE | CREATE_DELETE_ON_CLOSE,
 195                                   NULL, SMB2_OP_DELETE);
 196 }
 197
 198 int
 199 smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
 200             struct cifs_sb_info *cifs_sb)
 201 {
 202         return smb2_open_op_close(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
 203                                   CREATE_DELETE_ON_CLOSE | OPEN_REPARSE_POINT,
 204                                   NULL, SMB2_OP_DELETE);
 205 }
 206
 207 static int
 208 smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
 209                    const char *from_name, const char *to_name,
 210                    struct cifs_sb_info *cifs_sb, __u32 access, int command)
 211 {
 212         __le16 *smb2_to_name = NULL;
 213         int rc;
 214
 215         smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
 216         if (smb2_to_name == NULL) {
 217                 rc = -ENOMEM;
 218                 goto smb2_rename_path;
 219         }
 220
 221         rc = smb2_open_op_close(xid, tcon, cifs_sb, from_name, access,
 222                                 FILE_OPEN, 0, smb2_to_name, command);
 223 smb2_rename_path:
 224         kfree(smb2_to_name);
 225         return rc;
 226 }
 227
 228 int
 229 smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
 230                  const char *from_name, const char *to_name,
 231                  struct cifs_sb_info *cifs_sb)
 232 {
 233         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 234                                   DELETE, SMB2_OP_RENAME);
 235 }
 236
 237 int
 238 smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
 239                      const char *from_name, const char *to_name,
 240                      struct cifs_sb_info *cifs_sb)
 241 {
 242         return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
 243                                   FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK);
 244 }
 245
 246 int
 247 smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
 248                    const char *full_path, __u64 size,
 249                    struct cifs_sb_info *cifs_sb, bool set_alloc)
 250 {
 251         __le64 eof = cpu_to_le64(size);
 252         return smb2_open_op_close(xid, tcon, cifs_sb, full_path,
 253                                   FILE_WRITE_DATA, FILE_OPEN, 0, &eof,
 254                                   SMB2_OP_SET_EOF);
 255 }
 256
 257 int
 258 smb2_set_file_info(struct inode *inode, const char *full_path,
 259                    FILE_BASIC_INFO *buf, const unsigned int xid)
 260 {
 261         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 262         struct tcon_link *tlink;
 263         int rc;
 264
 265         tlink = cifs_sb_tlink(cifs_sb);
 266         if (IS_ERR(tlink))
 267                 return PTR_ERR(tlink);
 268         rc = smb2_open_op_close(xid, tlink_tcon(tlink), cifs_sb, full_path,
 269                                 FILE_WRITE_ATTRIBUTES, FILE_OPEN, 0, buf,
 270                                 SMB2_OP_SET_INFO);
 271         cifs_put_tlink(tlink);
 272         return rc;
 273 }