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   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         down(&sb->s_vfs_rename_sem);
  66         full_path = build_path_from_dentry(direntry);
  67         up(&sb->s_vfs_rename_sem);
  68         if(full_path == NULL) {
  69                 FreeXid(xid);
  70                 return -ENOMEM;
  71         }
  72         if(ea_name == NULL) {
  73                 cFYI(1,("Null xattr names not supported"));
  74         } else if(strncmp(ea_name,CIFS_XATTR_USER_PREFIX,5)
  75                 && (strncmp(ea_name,CIFS_XATTR_OS2_PREFIX,4))) {
  76                 cFYI(1,("illegal xattr namespace %s (only user namespace supported)",ea_name));
  77                 /* BB what if no namespace prefix? */
  78                 /* Should we just pass them to server, except for
  79                 system and perhaps security prefixes? */
  80         } else {
  81                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
  82                         goto remove_ea_exit;
  83
  84                 ea_name+=5; /* skip past user. prefix */
  85                 rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,NULL,
  86                         (__u16)0, cifs_sb->local_nls);
  87         }
  88 remove_ea_exit:
  89         if (full_path)
  90                 kfree(full_path);
  91         FreeXid(xid);
  92 #endif
  93         return rc;
  94 }
  95
  96 int cifs_setxattr(struct dentry * direntry, const char * ea_name,
  97         const void * ea_value, size_t value_size, int flags)
  98 {
  99         int rc = -EOPNOTSUPP;
 100 #ifdef CONFIG_CIFS_XATTR
 101         int xid;
 102         struct cifs_sb_info *cifs_sb;
 103         struct cifsTconInfo *pTcon;
 104         struct super_block * sb;
 105         char * full_path;
 106
 107         if(direntry == NULL)
 108                 return -EIO;
 109         if(direntry->d_inode == NULL)
 110                 return -EIO;
 111         sb = direntry->d_inode->i_sb;
 112         if(sb == NULL)
 113                 return -EIO;
 114         xid = GetXid();
 115
 116         cifs_sb = CIFS_SB(sb);
 117         pTcon = cifs_sb->tcon;
 118
 119         down(&sb->s_vfs_rename_sem);
 120         full_path = build_path_from_dentry(direntry);
 121         up(&sb->s_vfs_rename_sem);
 122         if(full_path == NULL) {
 123                 FreeXid(xid);
 124                 return -ENOMEM;
 125         }
 126         /* return dos attributes as pseudo xattr */
 127         /* return alt name if available as pseudo attr */
 128
 129         /* if proc/fs/cifs/streamstoxattr is set then
 130                 search server for EAs or streams to
 131                 returns as xattrs */
 132         if(value_size > MAX_EA_VALUE_SIZE) {
 133                 cFYI(1,("size of EA value too large"));
 134                 if(full_path)
 135                         kfree(full_path);
 136                 FreeXid(xid);
 137                 return -EOPNOTSUPP;
 138         }
 139
 140         if(ea_name == NULL) {
 141                 cFYI(1,("Null xattr names not supported"));
 142         } else if(strncmp(ea_name,CIFS_XATTR_USER_PREFIX,5) == 0) {
 143                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 144                         goto set_ea_exit;
 145                 if(strncmp(ea_name,CIFS_XATTR_DOS_ATTRIB,14) == 0) {
 146                         cFYI(1,("attempt to set cifs inode metadata"));
 147                 }
 148                 ea_name += 5; /* skip past user. prefix */
 149                 rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,ea_value,
 150                         (__u16)value_size, cifs_sb->local_nls);
 151         } else if(strncmp(ea_name, CIFS_XATTR_OS2_PREFIX,4) == 0) {
 152                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 153                         goto set_ea_exit;
 154
 155                 ea_name += 4; /* skip past os2. prefix */
 156                 rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,ea_value,
 157                         (__u16)value_size, cifs_sb->local_nls);
 158         } else {
 159                 int temp;
 160                 temp = strncmp(ea_name,POSIX_ACL_XATTR_ACCESS,
 161                         strlen(POSIX_ACL_XATTR_ACCESS));
 162                 if (temp == 0) {
 163 #ifdef CONFIG_CIFS_POSIX
 164                         if(sb->s_flags & MS_POSIXACL)
 165                                 rc = CIFSSMBSetPosixACL(xid, pTcon,full_path,
 166                                         ea_value, (const int)value_size,
 167                                         ACL_TYPE_ACCESS,cifs_sb->local_nls);
 168                         cFYI(1,("set POSIX ACL rc %d",rc));
 169 #else
 170                         cFYI(1,("set POSIX ACL not supported"));
 171 #endif
 172                 } else if(strncmp(ea_name,POSIX_ACL_XATTR_DEFAULT,strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
 173 #ifdef CONFIG_CIFS_POSIX
 174                         if(sb->s_flags & MS_POSIXACL)
 175                                 rc = CIFSSMBSetPosixACL(xid, pTcon,full_path,
 176                                         ea_value, (const int)value_size,
 177                                         ACL_TYPE_DEFAULT, cifs_sb->local_nls);
 178                         cFYI(1,("set POSIX default ACL rc %d",rc));
 179 #else
 180                         cFYI(1,("set default POSIX ACL not supported"));
 181 #endif
 182                 } else {
 183                         cFYI(1,("illegal xattr request %s (only user namespace supported)",ea_name));
 184                   /* BB what if no namespace prefix? */
 185                   /* Should we just pass them to server, except for
 186                   system and perhaps security prefixes? */
 187                 }
 188         }
 189
 190 set_ea_exit:
 191         if (full_path)
 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         down(&sb->s_vfs_rename_sem);
 223         full_path = build_path_from_dentry(direntry);
 224         up(&sb->s_vfs_rename_sem);
 225         if(full_path == NULL) {
 226                 FreeXid(xid);
 227                 return -ENOMEM;
 228         }
 229         /* return dos attributes as pseudo xattr */
 230         /* return alt name if available as pseudo attr */
 231         if(ea_name == NULL) {
 232                 cFYI(1,("Null xattr names not supported"));
 233         } else if(strncmp(ea_name,CIFS_XATTR_USER_PREFIX,5) == 0) {
 234                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 235                         goto get_ea_exit;
 236
 237                 if(strncmp(ea_name,CIFS_XATTR_DOS_ATTRIB,14) == 0) {
 238                         cFYI(1,("attempt to query cifs inode metadata"));
 239                         /* revalidate/getattr then populate from inode */
 240                 } /* BB add else when above is implemented */
 241                 ea_name += 5; /* skip past user. prefix */
 242                 rc = CIFSSMBQueryEA(xid,pTcon,full_path,ea_name,ea_value,
 243                         buf_size, cifs_sb->local_nls);
 244         } else if(strncmp(ea_name, CIFS_XATTR_OS2_PREFIX,4) == 0) {
 245                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 246                         goto get_ea_exit;
 247
 248                 ea_name += 4; /* skip past os2. prefix */
 249                 rc = CIFSSMBQueryEA(xid,pTcon,full_path,ea_name,ea_value,
 250                         buf_size, cifs_sb->local_nls);
 251         } else if(strncmp(ea_name,POSIX_ACL_XATTR_ACCESS,strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
 252 #ifdef CONFIG_CIFS_POSIX
 253                 if(sb->s_flags & MS_POSIXACL)
 254                         rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
 255                                 ea_value, buf_size, ACL_TYPE_ACCESS,
 256                                 cifs_sb->local_nls);
 257 #else
 258                 cFYI(1,("query POSIX ACL not supported yet"));
 259 #endif /* CONFIG_CIFS_POSIX */
 260         } else if(strncmp(ea_name,POSIX_ACL_XATTR_DEFAULT,strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
 261 #ifdef CONFIG_CIFS_POSIX
 262                 if(sb->s_flags & MS_POSIXACL)
 263                         rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
 264                                 ea_value, buf_size, ACL_TYPE_DEFAULT,
 265                                 cifs_sb->local_nls);
 266 #else
 267                 cFYI(1,("query POSIX default ACL not supported yet"));
 268 #endif
 269         } else if(strncmp(ea_name,
 270                   CIFS_XATTR_TRUSTED_PREFIX,XATTR_TRUSTED_PREFIX_LEN) == 0) {
 271                 cFYI(1,("Trusted xattr namespace not supported yet"));
 272         } else if(strncmp(ea_name,
 273                   CIFS_XATTR_SECURITY_PREFIX,XATTR_SECURITY_PREFIX_LEN) == 0) {
 274                 cFYI(1,("Security xattr namespace not supported yet"));
 275         } else {
 276                 cFYI(1,("illegal xattr name request %s (only user namespace supported)",ea_name));
 277         }
 278
 279         /* We could add an additional check for streams ie
 280             if proc/fs/cifs/streamstoxattr is set then
 281                 search server for EAs or streams to
 282                 returns as xattrs */
 283
 284         if(rc == -EINVAL)
 285                 rc = -EOPNOTSUPP;
 286
 287 get_ea_exit:
 288         if (full_path)
 289                 kfree(full_path);
 290         FreeXid(xid);
 291 #endif
 292         return rc;
 293 }
 294
 295 ssize_t cifs_listxattr(struct dentry * direntry, char * data, size_t buf_size)
 296 {
 297         ssize_t rc = -EOPNOTSUPP;
 298 #ifdef CONFIG_CIFS_XATTR
 299         int xid;
 300         struct cifs_sb_info *cifs_sb;
 301         struct cifsTconInfo *pTcon;
 302         struct super_block * sb;
 303         char * full_path;
 304
 305         if(direntry == NULL)
 306                 return -EIO;
 307         if(direntry->d_inode == NULL)
 308                 return -EIO;
 309         sb = direntry->d_inode->i_sb;
 310         if(sb == NULL)
 311                 return -EIO;
 312         xid = GetXid();
 313
 314         cifs_sb = CIFS_SB(sb);
 315         pTcon = cifs_sb->tcon;
 316
 317         down(&sb->s_vfs_rename_sem);
 318         full_path = build_path_from_dentry(direntry);
 319         up(&sb->s_vfs_rename_sem);
 320         if(full_path == NULL) {
 321                 FreeXid(xid);
 322                 return -ENOMEM;
 323         }
 324         /* return dos attributes as pseudo xattr */
 325         /* return alt name if available as pseudo attr */
 326
 327         /* if proc/fs/cifs/streamstoxattr is set then
 328                 search server for EAs or streams to
 329                 returns as xattrs */
 330         rc = CIFSSMBQAllEAs(xid,pTcon,full_path,data,buf_size,
 331                                 cifs_sb->local_nls);
 332
 333         if (full_path)
 334                 kfree(full_path);
 335         FreeXid(xid);
 336 #endif
 337         return rc;
 338 }