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         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                         rc = CIFSSMBSetPosixACL(xid, pTcon,full_path,ea_value,
 165                                 (const int)value_size, ACL_TYPE_ACCESS,
 166                                 cifs_sb->local_nls);
 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                         rc = CIFSSMBSetPosixACL(xid, pTcon,full_path,ea_value,
 174                                 (const int)value_size, ACL_TYPE_DEFAULT,
 175                                 cifs_sb->local_nls);
 176                         cFYI(1,("set POSIX default ACL rc %d",rc));
 177 #else
 178                         cFYI(1,("set default POSIX ACL not supported"));
 179 #endif
 180                 } else {
 181                         cFYI(1,("illegal xattr request %s (only user namespace supported)",ea_name));
 182                   /* BB what if no namespace prefix? */
 183                   /* Should we just pass them to server, except for
 184                   system and perhaps security prefixes? */
 185                 }
 186         }
 187
 188 set_ea_exit:
 189         if (full_path)
 190                 kfree(full_path);
 191         FreeXid(xid);
 192 #endif
 193         return rc;
 194 }
 195
 196 ssize_t cifs_getxattr(struct dentry * direntry, const char * ea_name,
 197          void * ea_value, size_t buf_size)
 198 {
 199         ssize_t rc = -EOPNOTSUPP;
 200 #ifdef CONFIG_CIFS_XATTR
 201         int xid;
 202         struct cifs_sb_info *cifs_sb;
 203         struct cifsTconInfo *pTcon;
 204         struct super_block * sb;
 205         char * full_path;
 206
 207         if(direntry == NULL)
 208                 return -EIO;
 209         if(direntry->d_inode == NULL)
 210                 return -EIO;
 211         sb = direntry->d_inode->i_sb;
 212         if(sb == NULL)
 213                 return -EIO;
 214
 215         xid = GetXid();
 216
 217         cifs_sb = CIFS_SB(sb);
 218         pTcon = cifs_sb->tcon;
 219
 220         down(&sb->s_vfs_rename_sem);
 221         full_path = build_path_from_dentry(direntry);
 222         up(&sb->s_vfs_rename_sem);
 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         } else if(strncmp(ea_name, CIFS_XATTR_OS2_PREFIX,4) == 0) {
 243                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 244                         goto get_ea_exit;
 245
 246                 ea_name += 4; /* skip past os2. prefix */
 247                 rc = CIFSSMBQueryEA(xid,pTcon,full_path,ea_name,ea_value,
 248                         buf_size, cifs_sb->local_nls);
 249         } else if(strncmp(ea_name,POSIX_ACL_XATTR_ACCESS,strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
 250 #ifdef CONFIG_CIFS_POSIX
 251                 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
 252                                 ea_value, buf_size, ACL_TYPE_ACCESS,
 253                                 cifs_sb->local_nls);
 254 #else
 255                 cFYI(1,("query POSIX ACL not supported yet"));
 256 #endif /* CONFIG_CIFS_POSIX */
 257         } else if(strncmp(ea_name,POSIX_ACL_XATTR_DEFAULT,strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
 258 #ifdef CONFIG_CIFS_POSIX
 259                 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
 260                                 ea_value, buf_size, ACL_TYPE_DEFAULT,
 261                                 cifs_sb->local_nls);
 262 #else
 263                 cFYI(1,("query POSIX default ACL not supported yet"));
 264 #endif
 265         } else if(strncmp(ea_name,
 266                   CIFS_XATTR_TRUSTED_PREFIX,XATTR_TRUSTED_PREFIX_LEN) == 0) {
 267                 cFYI(1,("Trusted xattr namespace not supported yet"));
 268         } else if(strncmp(ea_name,
 269                   CIFS_XATTR_SECURITY_PREFIX,XATTR_SECURITY_PREFIX_LEN) == 0) {
 270                 cFYI(1,("Security xattr namespace not supported yet"));
 271         } else {
 272                 cFYI(1,("illegal xattr name request %s (only user namespace supported)",ea_name));
 273         }
 274
 275         /* We could add an additional check for streams ie
 276             if proc/fs/cifs/streamstoxattr is set then
 277                 search server for EAs or streams to
 278                 returns as xattrs */
 279
 280         if(rc == -EINVAL)
 281                 rc = -EOPNOTSUPP;
 282
 283 get_ea_exit:
 284         if (full_path)
 285                 kfree(full_path);
 286         FreeXid(xid);
 287 #endif
 288         return rc;
 289 }
 290
 291 ssize_t cifs_listxattr(struct dentry * direntry, char * data, size_t buf_size)
 292 {
 293         ssize_t rc = -EOPNOTSUPP;
 294 #ifdef CONFIG_CIFS_XATTR
 295         int xid;
 296         struct cifs_sb_info *cifs_sb;
 297         struct cifsTconInfo *pTcon;
 298         struct super_block * sb;
 299         char * full_path;
 300
 301         if(direntry == NULL)
 302                 return -EIO;
 303         if(direntry->d_inode == NULL)
 304                 return -EIO;
 305         sb = direntry->d_inode->i_sb;
 306         if(sb == NULL)
 307                 return -EIO;
 308         xid = GetXid();
 309
 310         cifs_sb = CIFS_SB(sb);
 311         pTcon = cifs_sb->tcon;
 312
 313         down(&sb->s_vfs_rename_sem);
 314         full_path = build_path_from_dentry(direntry);
 315         up(&sb->s_vfs_rename_sem);
 316         if(full_path == NULL) {
 317                 FreeXid(xid);
 318                 return -ENOMEM;
 319         }
 320         /* return dos attributes as pseudo xattr */
 321         /* return alt name if available as pseudo attr */
 322
 323         /* if proc/fs/cifs/streamstoxattr is set then
 324                 search server for EAs or streams to
 325                 returns as xattrs */
 326         rc = CIFSSMBQAllEAs(xid,pTcon,full_path,data,buf_size,
 327                                 cifs_sb->local_nls);
 328
 329         if (full_path)
 330                 kfree(full_path);
 331         FreeXid(xid);
 332 #endif
 333         return rc;
 334 }