ceph/src/common/xattr.c

   1 /*
   2  * Ceph - scalable distributed file system
   3  *
   4  * Copyright (C) 2011 Stanislav Sedov <stas@FreeBSD.org>
   5  *
   6  * This is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License version 2.1, as published by the Free Software
   9  * Foundation.  See file COPYING.
  10  */
  11
  12 #if defined(__FreeBSD__)
  13 #include <errno.h>
  14 #include <stdint.h>
  15 #include <stdlib.h>
  16 #include <strings.h>
  17 #include <sys/types.h>
  18 #include <sys/extattr.h>
  19 #elif defined(__linux__)
  20 #include <sys/types.h>
  21 #include <sys/xattr.h>
  22 #elif defined(DARWIN)
  23 #include <sys/xattr.h>
  24 #else
  25 #error "Your system is not supported!"
  26 #endif
  27
  28 #include "common/xattr.h"
  29
  30 /*
  31  * Sets extended attribute on a file.
  32  * Returns 0 on success, -1 on failure.
  33  */
  34 int
  35 ceph_os_setxattr(const char *path, const char *name,
  36     const void *value, size_t size)
  37 {
  38         int error = -1;
  39
  40 #if defined(__FreeBSD__)
  41         error = extattr_set_file(path, EXTATTR_NAMESPACE_USER, name, value,
  42             size);
  43         if (error > 0)
  44                 error = 0;
  45 #elif defined(__linux__)
  46         error = setxattr(path, name, value, size, 0);
  47 #elif defined(DARWIN)
  48         error = setxattr(path, name, value, size, 0 /* position */, 0);
  49 #endif
  50
  51         return (error);
  52 }
  53
  54 int
  55 ceph_os_fsetxattr(int fd, const char *name, const void *value,
  56     size_t size)
  57 {
  58         int error = -1;
  59
  60 #if defined(__FreeBSD__)
  61         error = extattr_set_fd(fd, EXTATTR_NAMESPACE_USER, name, value, size);
  62         if (error > 0)
  63                 error = 0;
  64 #elif defined(__linux__)
  65         error = fsetxattr(fd, name, value, size, 0);
  66 #elif defined(DARWIN)
  67         error = fsetxattr(fd, name, value, size, 0, 0 /* no options should be indentical to Linux */ );
  68 #endif
  69
  70         return (error);
  71 }
  72
  73 ssize_t
  74 ceph_os_getxattr(const char *path, const char *name,
  75 void *value, size_t size)
  76 {
  77         ssize_t error = -1;
  78
  79 #if defined(__FreeBSD__)
  80         if (value == NULL || size == 0) {
  81                 error = extattr_get_file(path, EXTATTR_NAMESPACE_USER, name, value,
  82                     size);
  83         } else {
  84                 error = extattr_get_file(path, EXTATTR_NAMESPACE_USER, name, NULL,
  85                     0);
  86                 if (error > 0) {
  87                         if (error > size) {
  88                                 errno = ERANGE;
  89                                 error = -1;
  90                         } else  {
  91                                 error = extattr_get_file(path, EXTATTR_NAMESPACE_USER,
  92                                     name, value, size);
  93                         }
  94                 }
  95         }
  96 #elif defined(__linux__)
  97         error = getxattr(path, name, value, size);
  98 #elif defined(DARWIN)
  99         error = getxattr(path, name, value, size, 0 /* position  */, 0);
 100         /* ENOATTR and ENODATA have different values */
 101         if (error < 0 && errno == ENOATTR)
 102                 errno = ENODATA;
 103 #endif
 104
 105         return (error);
 106 }
 107
 108 ssize_t
 109 ceph_os_fgetxattr(int fd, const char *name, void *value,
 110     size_t size)
 111 {
 112         ssize_t error = -1;
 113
 114 #if defined(__FreeBSD__)
 115         if (value == NULL || size == 0) {
 116                 error = extattr_get_fd(fd, EXTATTR_NAMESPACE_USER, name, value,
 117                     size);
 118         } else {
 119                 error = extattr_get_fd(fd, EXTATTR_NAMESPACE_USER, name, NULL,
 120                     0);
 121                 if (error > 0) {
 122                         if (error > size) {
 123                                 errno = ERANGE;
 124                                 error = -1;
 125                         } else  {
 126                                 error = extattr_get_fd(fd, EXTATTR_NAMESPACE_USER,
 127                                     name, value, size);
 128                         }
 129                 }
 130         }
 131 #elif defined(__linux__)
 132         error = fgetxattr(fd, name, value, size);
 133 #elif defined(DARWIN)
 134         error = fgetxattr(fd, name, value, size, 0, 0 /* no options */);
 135         /* ENOATTR and ENODATA have different values */
 136         if (error < 0 && errno == ENOATTR)
 137                 errno = ENODATA;
 138 #endif
 139
 140         return (error);
 141 }
 142
 143 ssize_t
 144 ceph_os_listxattr(const char *path, char *list, size_t size)
 145 {
 146         ssize_t error = -1;
 147
 148 #if defined(__FreeBSD__)
 149         /*
 150          * XXX. The format of the list FreeBSD returns differs
 151          * from the Linux ones.  We have to perform the conversion. :-(
 152          */
 153         char *newlist, *p, *p1;
 154
 155         if (size != 0) {
 156                 newlist = malloc(size);
 157                 if (newlist != NULL) {
 158                         error = extattr_list_file(path, EXTATTR_NAMESPACE_USER,
 159                             newlist, size);
 160                         if (error > 0) {
 161                                 p = newlist;
 162                                 p1 = list;
 163                                 while ((p - newlist) < error) {
 164                                         uint8_t len = *(uint8_t *)p;
 165                                         p++;
 166                                         if ((p + len - newlist) > error)
 167                                                 break;
 168                                         if (len > 0) {
 169                                                 bcopy(p, p1, len);
 170                                                 p += len;
 171                                                 p1 += len;
 172                                                 *p1++ = '\0';
 173                                         }
 174                                 }
 175                                 error = p1 - list;
 176                         }
 177                         free(newlist);
 178                 }
 179         } else {
 180                 error = extattr_list_file(path, EXTATTR_NAMESPACE_USER,
 181                     list, size);
 182         }
 183 #elif defined(__linux__)
 184         error = listxattr(path, list, size);
 185 #elif defined(DARWIN)
 186         error = listxattr(path, list, size, 0);
 187 #endif
 188
 189         return (error);
 190 }
 191
 192 ssize_t
 193 ceph_os_flistxattr(int fd, char *list, size_t size)
 194 {
 195         ssize_t error = -1;
 196
 197 #if defined(__FreeBSD__)
 198         /*
 199          * XXX. The format of the list FreeBSD returns differs
 200          * from the Linux ones.  We have to perform the conversion. :-(
 201          */
 202         char *newlist, *p, *p1;
 203
 204         if (size != 0) {
 205                 newlist = malloc(size);
 206                 if (newlist != NULL) {
 207                         error = extattr_list_fd(fd, EXTATTR_NAMESPACE_USER,
 208                             newlist, size);
 209                         if (error > 0) {
 210                                 p = newlist;
 211                                 p1 = list;
 212                                 while ((p - newlist) < error) {
 213                                         uint8_t len = *(uint8_t *)p;
 214                                         p++;
 215                                         if ((p + len - newlist) > error)
 216                                                 break;
 217                                         if (len > 0) {
 218                                                 bcopy(p, p1, len);
 219                                                 p += len;
 220                                                 p1 += len;
 221                                                 *p1++ = '\0';
 222                                         }
 223                                 }
 224                                 error = p1 - list;
 225                         }
 226                         free(newlist);
 227                 }
 228         } else {
 229                 error = extattr_list_fd(fd, EXTATTR_NAMESPACE_USER,
 230                     list, size);
 231         }
 232 #elif defined(__linux__)
 233         error = flistxattr(fd, list, size);
 234 #elif defined(DARWIN)
 235         error = flistxattr(fd, list, size, 0);
 236 #endif
 237
 238         return (error);
 239 }
 240
 241 int
 242 ceph_os_removexattr(const char *path, const char *name)
 243 {
 244         int error = -1;
 245
 246 #if defined(__FreeBSD__)
 247         error = extattr_delete_file(path, EXTATTR_NAMESPACE_USER, name);
 248 #elif defined(__linux__)
 249         error = removexattr(path, name);
 250 #elif defined(DARWIN)
 251         error = removexattr(path, name, 0);
 252         /* ENOATTR and ENODATA have different values */
 253         if (error < 0 && errno == ENOATTR)
 254                 errno = ENODATA;
 255 #endif
 256
 257         return (error);
 258 }
 259
 260 int
 261 ceph_os_fremovexattr(int fd, const char *name)
 262 {
 263         int error = -1;
 264
 265 #if defined(__FreeBSD__)
 266         error = extattr_delete_fd(fd, EXTATTR_NAMESPACE_USER, name);
 267 #elif defined(__linux__)
 268         error = fremovexattr(fd, name);
 269 #elif defined(DARWIN)
 270         error = fremovexattr(fd, name, 0);
 271         /* ENOATTR and ENODATA have different values */
 272         if (error < 0 && errno == ENOATTR)
 273                 errno = ENODATA;
 274 #endif
 275
 276         return (error);
 277 }