fs/cifs/xattr.c

   1 /*
   2  *   fs/cifs/xattr.c
   3  *
   4  *   Copyright (c) International Business Machines  Corp., 2003
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU Lesser General Public License
  18  *   along with this library; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include <linux/fs.h>
  23 #include <linux/posix_acl_xattr.h>
  24 #include "cifsfs.h"
  25 #include "cifspdu.h"
  26 #include "cifsglob.h"
  27 #include "cifsproto.h"
  28 #include "cifs_debug.h"
  29
  30 #define MAX_EA_VALUE_SIZE 65535
  31 #define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib"
  32 #define CIFS_XATTR_USER_PREFIX "user."
  33 #define CIFS_XATTR_SYSTEM_PREFIX "system."
  34 #define CIFS_XATTR_OS2_PREFIX "os2."
  35 #define CIFS_XATTR_SECURITY_PREFIX ".security"
  36 #define CIFS_XATTR_TRUSTED_PREFIX "trusted."
  37 #define XATTR_TRUSTED_PREFIX_LEN  8
  38 #define XATTR_SECURITY_PREFIX_LEN 9
  39 /* BB need to add server (Samba e.g) support for security and trusted prefix */
  40
  41
  42
  43 int cifs_removexattr(struct dentry * direntry, const char * ea_name)
  44 {
  45         int rc = -EOPNOTSUPP;
  46 #ifdef CONFIG_CIFS_XATTR
  47         int xid;
  48         struct cifs_sb_info *cifs_sb;
  49         struct cifsTconInfo *pTcon;
  50         struct super_block * sb;
  51         char * full_path;
  52
  53         if(direntry == NULL)
  54                 return -EIO;
  55         if(direntry->d_inode == NULL)
  56                 return -EIO;
  57         sb = direntry->d_inode->i_sb;
  58         if(sb == NULL)
  59                 return -EIO;
  60         xid = GetXid();
  61
  62         cifs_sb = CIFS_SB(sb);
  63         pTcon = cifs_sb->tcon;
  64
  65         full_path = build_path_from_dentry(direntry);
  66         if(full_path == NULL) {
  67                 FreeXid(xid);
  68                 return -ENOMEM;
  69         }
  70         if(ea_name == NULL) {
  71                 cFYI(1,("Null xattr names not supported"));
  72         } else if(strncmp(ea_name,CIFS_XATTR_USER_PREFIX,5)
  73                 && (strncmp(ea_name,CIFS_XATTR_OS2_PREFIX,4))) {
  74                 cFYI(1,("illegal xattr namespace %s (only user namespace supported)",ea_name));
  75                 /* BB what if no namespace prefix? */
  76                 /* Should we just pass them to server, except for
  77                 system and perhaps security prefixes? */
  78         } else {
  79                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
  80                         goto remove_ea_exit;
  81
  82                 ea_name+=5; /* skip past user. prefix */
  83                 rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,NULL,
  84                         (__u16)0, cifs_sb->local_nls,
  85                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
  86         }
  87 remove_ea_exit:
  88         kfree(full_path);
  89         FreeXid(xid);
  90 #endif
  91         return rc;
  92 }
  93
  94 int cifs_setxattr(struct dentry * direntry, const char * ea_name,
  95         const void * ea_value, size_t value_size, int flags)
  96 {
  97         int rc = -EOPNOTSUPP;
  98 #ifdef CONFIG_CIFS_XATTR
  99         int xid;
 100         struct cifs_sb_info *cifs_sb;
 101         struct cifsTconInfo *pTcon;
 102         struct super_block * sb;
 103         char * full_path;
 104
 105         if(direntry == NULL)
 106                 return -EIO;
 107         if(direntry->d_inode == NULL)
 108                 return -EIO;
 109         sb = direntry->d_inode->i_sb;
 110         if(sb == NULL)
 111                 return -EIO;
 112         xid = GetXid();
 113
 114         cifs_sb = CIFS_SB(sb);
 115         pTcon = cifs_sb->tcon;
 116
 117         full_path = build_path_from_dentry(direntry);
 118         if(full_path == NULL) {
 119                 FreeXid(xid);
 120                 return -ENOMEM;
 121         }
 122         /* return dos attributes as pseudo xattr */
 123         /* return alt name if available as pseudo attr */
 124
 125         /* if proc/fs/cifs/streamstoxattr is set then
 126                 search server for EAs or streams to
 127                 returns as xattrs */
 128         if(value_size > MAX_EA_VALUE_SIZE) {
 129                 cFYI(1,("size of EA value too large"));
 130                 kfree(full_path);
 131                 FreeXid(xid);
 132                 return -EOPNOTSUPP;
 133         }
 134
 135         if(ea_name == NULL) {
 136                 cFYI(1,("Null xattr names not supported"));
 137         } else if(strncmp(ea_name,CIFS_XATTR_USER_PREFIX,5) == 0) {
 138                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 139                         goto set_ea_exit;
 140                 if(strncmp(ea_name,CIFS_XATTR_DOS_ATTRIB,14) == 0) {
 141                         cFYI(1,("attempt to set cifs inode metadata"));
 142                 }
 143                 ea_name += 5; /* skip past user. prefix */
 144                 rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,ea_value,
 145                         (__u16)value_size, cifs_sb->local_nls,
 146                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 147         } else if(strncmp(ea_name, CIFS_XATTR_OS2_PREFIX,4) == 0) {
 148                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 149                         goto set_ea_exit;
 150
 151                 ea_name += 4; /* skip past os2. prefix */
 152                 rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,ea_value,
 153                         (__u16)value_size, cifs_sb->local_nls,
 154                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 155         } else {
 156                 int temp;
 157                 temp = strncmp(ea_name,POSIX_ACL_XATTR_ACCESS,
 158                         strlen(POSIX_ACL_XATTR_ACCESS));
 159                 if (temp == 0) {
 160 #ifdef CONFIG_CIFS_POSIX
 161                         if(sb->s_flags & MS_POSIXACL)
 162                                 rc = CIFSSMBSetPosixACL(xid, pTcon,full_path,
 163                                         ea_value, (const int)value_size,
 164                                         ACL_TYPE_ACCESS,cifs_sb->local_nls,
 165                                         cifs_sb->mnt_cifs_flags &
 166                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 167                         cFYI(1,("set POSIX ACL rc %d",rc));
 168 #else
 169                         cFYI(1,("set POSIX ACL not supported"));
 170 #endif
 171                 } else if(strncmp(ea_name,POSIX_ACL_XATTR_DEFAULT,strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
 172 #ifdef CONFIG_CIFS_POSIX
 173                         if(sb->s_flags & MS_POSIXACL)
 174                                 rc = CIFSSMBSetPosixACL(xid, pTcon,full_path,
 175                                         ea_value, (const int)value_size,
 176                                         ACL_TYPE_DEFAULT, cifs_sb->local_nls,
 177                                         cifs_sb->mnt_cifs_flags &
 178                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 179                         cFYI(1,("set POSIX default ACL rc %d",rc));
 180 #else
 181                         cFYI(1,("set default POSIX ACL not supported"));
 182 #endif
 183                 } else {
 184                         cFYI(1,("illegal xattr request %s (only user namespace supported)",ea_name));
 185                   /* BB what if no namespace prefix? */
 186                   /* Should we just pass them to server, except for
 187                   system and perhaps security prefixes? */
 188                 }
 189         }
 190
 191 set_ea_exit:
 192         kfree(full_path);
 193         FreeXid(xid);
 194 #endif
 195         return rc;
 196 }
 197
 198 ssize_t cifs_getxattr(struct dentry * direntry, const char * ea_name,
 199          void * ea_value, size_t buf_size)
 200 {
 201         ssize_t rc = -EOPNOTSUPP;
 202 #ifdef CONFIG_CIFS_XATTR
 203         int xid;
 204         struct cifs_sb_info *cifs_sb;
 205         struct cifsTconInfo *pTcon;
 206         struct super_block * sb;
 207         char * full_path;
 208
 209         if(direntry == NULL)
 210                 return -EIO;
 211         if(direntry->d_inode == NULL)
 212                 return -EIO;
 213         sb = direntry->d_inode->i_sb;
 214         if(sb == NULL)
 215                 return -EIO;
 216
 217         xid = GetXid();
 218
 219         cifs_sb = CIFS_SB(sb);
 220         pTcon = cifs_sb->tcon;
 221
 222         full_path = build_path_from_dentry(direntry);
 223         if(full_path == NULL) {
 224                 FreeXid(xid);
 225                 return -ENOMEM;
 226         }
 227         /* return dos attributes as pseudo xattr */
 228         /* return alt name if available as pseudo attr */
 229         if(ea_name == NULL) {
 230                 cFYI(1,("Null xattr names not supported"));
 231         } else if(strncmp(ea_name,CIFS_XATTR_USER_PREFIX,5) == 0) {
 232                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 233                         goto get_ea_exit;
 234
 235                 if(strncmp(ea_name,CIFS_XATTR_DOS_ATTRIB,14) == 0) {
 236                         cFYI(1,("attempt to query cifs inode metadata"));
 237                         /* revalidate/getattr then populate from inode */
 238                 } /* BB add else when above is implemented */
 239                 ea_name += 5; /* skip past user. prefix */
 240                 rc = CIFSSMBQueryEA(xid,pTcon,full_path,ea_name,ea_value,
 241                         buf_size, cifs_sb->local_nls,
 242                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 243         } else if(strncmp(ea_name, CIFS_XATTR_OS2_PREFIX,4) == 0) {
 244                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 245                         goto get_ea_exit;
 246
 247                 ea_name += 4; /* skip past os2. prefix */
 248                 rc = CIFSSMBQueryEA(xid,pTcon,full_path,ea_name,ea_value,
 249                         buf_size, cifs_sb->local_nls,
 250                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 251         } else if(strncmp(ea_name,POSIX_ACL_XATTR_ACCESS,
 252                           strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
 253 #ifdef CONFIG_CIFS_POSIX
 254                 if(sb->s_flags & MS_POSIXACL)
 255                         rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
 256                                 ea_value, buf_size, ACL_TYPE_ACCESS,
 257                                 cifs_sb->local_nls,
 258                                 cifs_sb->mnt_cifs_flags &
 259                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 260 /*              else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
 261                         __u16 fid;
 262                         int oplock = FALSE;
 263                         rc = CIFSSMBOpen(xid, pTcon, full_path,
 264                                          FILE_OPEN, GENERIC_READ, 0, &fid,
 265                                          &oplock, NULL, cifs_sb->local_nls,
 266                                          cifs_sb->mnt_cifs_flags &
 267                                          CIFS_MOUNT_MAP_SPECIAL_CHR);
 268                         if(rc == 0) {
 269                                 rc = CIFSSMBGetCIFSACL(xid, pTcon, fid,
 270                                         ea_value, buf_size,
 271                                         ACL_TYPE_ACCESS);
 272                                 CIFSSMBClose(xid, pTcon, fid)
 273                         }
 274                 } */  /* BB enable after fixing up return data */
 275
 276 #else
 277                 cFYI(1,("query POSIX ACL not supported yet"));
 278 #endif /* CONFIG_CIFS_POSIX */
 279         } else if(strncmp(ea_name,POSIX_ACL_XATTR_DEFAULT,
 280                           strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
 281 #ifdef CONFIG_CIFS_POSIX
 282                 if(sb->s_flags & MS_POSIXACL)
 283                         rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
 284                                 ea_value, buf_size, ACL_TYPE_DEFAULT,
 285                                 cifs_sb->local_nls,
 286                                 cifs_sb->mnt_cifs_flags &
 287                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 288 #else
 289                 cFYI(1,("query POSIX default ACL not supported yet"));
 290 #endif
 291         } else if(strncmp(ea_name,
 292                   CIFS_XATTR_TRUSTED_PREFIX,XATTR_TRUSTED_PREFIX_LEN) == 0) {
 293                 cFYI(1,("Trusted xattr namespace not supported yet"));
 294         } else if(strncmp(ea_name,
 295                   CIFS_XATTR_SECURITY_PREFIX,XATTR_SECURITY_PREFIX_LEN) == 0) {
 296                 cFYI(1,("Security xattr namespace not supported yet"));
 297         } else {
 298                 cFYI(1,("illegal xattr name request %s (only user namespace supported)",ea_name));
 299         }
 300
 301         /* We could add an additional check for streams ie
 302             if proc/fs/cifs/streamstoxattr is set then
 303                 search server for EAs or streams to
 304                 returns as xattrs */
 305
 306         if(rc == -EINVAL)
 307                 rc = -EOPNOTSUPP;
 308
 309 get_ea_exit:
 310         kfree(full_path);
 311         FreeXid(xid);
 312 #endif
 313         return rc;
 314 }
 315
 316 ssize_t cifs_listxattr(struct dentry * direntry, char * data, size_t buf_size)
 317 {
 318         ssize_t rc = -EOPNOTSUPP;
 319 #ifdef CONFIG_CIFS_XATTR
 320         int xid;
 321         struct cifs_sb_info *cifs_sb;
 322         struct cifsTconInfo *pTcon;
 323         struct super_block * sb;
 324         char * full_path;
 325
 326         if(direntry == NULL)
 327                 return -EIO;
 328         if(direntry->d_inode == NULL)
 329                 return -EIO;
 330         sb = direntry->d_inode->i_sb;
 331         if(sb == NULL)
 332                 return -EIO;
 333         xid = GetXid();
 334
 335         cifs_sb = CIFS_SB(sb);
 336         pTcon = cifs_sb->tcon;
 337
 338         full_path = build_path_from_dentry(direntry);
 339         if(full_path == NULL) {
 340                 FreeXid(xid);
 341                 return -ENOMEM;
 342         }
 343         /* return dos attributes as pseudo xattr */
 344         /* return alt name if available as pseudo attr */
 345
 346         /* if proc/fs/cifs/streamstoxattr is set then
 347                 search server for EAs or streams to
 348                 returns as xattrs */
 349         rc = CIFSSMBQAllEAs(xid,pTcon,full_path,data,buf_size,
 350                                 cifs_sb->local_nls,
 351                                 cifs_sb->mnt_cifs_flags &
 352                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
 353
 354         kfree(full_path);
 355         FreeXid(xid);
 356 #endif
 357         return rc;
 358 }