Lachlan McIlroy | f9e09f0 | 2008-06-23 13:34:09 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 Christoph Hellwig. |
| 3 | * Portions Copyright (C) 2000-2008 Silicon Graphics, Inc. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it would be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write the Free Software Foundation, |
| 16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 17 | */ |
| 18 | |
| 19 | #include "xfs.h" |
| 20 | #include "xfs_da_btree.h" |
| 21 | #include "xfs_bmap_btree.h" |
| 22 | #include "xfs_inode.h" |
| 23 | #include "xfs_attr.h" |
| 24 | #include "xfs_attr_leaf.h" |
| 25 | #include "xfs_acl.h" |
| 26 | #include "xfs_vnodeops.h" |
| 27 | |
| 28 | #include <linux/posix_acl_xattr.h> |
| 29 | #include <linux/xattr.h> |
| 30 | |
| 31 | |
Lachlan McIlroy | f9e09f0 | 2008-06-23 13:34:09 +1000 | [diff] [blame] | 32 | static int |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame^] | 33 | xfs_xattr_get(struct dentry *dentry, const char *name, |
Lachlan McIlroy | f9e09f0 | 2008-06-23 13:34:09 +1000 | [diff] [blame] | 34 | void *value, size_t size, int xflags) |
| 35 | { |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame^] | 36 | struct xfs_inode *ip = XFS_I(dentry->d_inode); |
Lachlan McIlroy | f9e09f0 | 2008-06-23 13:34:09 +1000 | [diff] [blame] | 37 | int error, asize = size; |
| 38 | |
| 39 | if (strcmp(name, "") == 0) |
| 40 | return -EINVAL; |
| 41 | |
| 42 | /* Convert Linux syscall to XFS internal ATTR flags */ |
| 43 | if (!size) { |
| 44 | xflags |= ATTR_KERNOVAL; |
| 45 | value = NULL; |
| 46 | } |
| 47 | |
| 48 | error = -xfs_attr_get(ip, name, value, &asize, xflags); |
| 49 | if (error) |
| 50 | return error; |
| 51 | return asize; |
| 52 | } |
| 53 | |
| 54 | static int |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame^] | 55 | xfs_xattr_set(struct dentry *dentry, const char *name, const void *value, |
Lachlan McIlroy | f9e09f0 | 2008-06-23 13:34:09 +1000 | [diff] [blame] | 56 | size_t size, int flags, int xflags) |
| 57 | { |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame^] | 58 | struct xfs_inode *ip = XFS_I(dentry->d_inode); |
Lachlan McIlroy | f9e09f0 | 2008-06-23 13:34:09 +1000 | [diff] [blame] | 59 | |
| 60 | if (strcmp(name, "") == 0) |
| 61 | return -EINVAL; |
| 62 | |
| 63 | /* Convert Linux syscall to XFS internal ATTR flags */ |
| 64 | if (flags & XATTR_CREATE) |
| 65 | xflags |= ATTR_CREATE; |
| 66 | if (flags & XATTR_REPLACE) |
| 67 | xflags |= ATTR_REPLACE; |
| 68 | |
| 69 | if (!value) |
| 70 | return -xfs_attr_remove(ip, name, xflags); |
| 71 | return -xfs_attr_set(ip, name, (void *)value, size, xflags); |
| 72 | } |
| 73 | |
Lachlan McIlroy | f9e09f0 | 2008-06-23 13:34:09 +1000 | [diff] [blame] | 74 | static struct xattr_handler xfs_xattr_user_handler = { |
| 75 | .prefix = XATTR_USER_PREFIX, |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame^] | 76 | .flags = 0, /* no flags implies user namespace */ |
| 77 | .get = xfs_xattr_get, |
| 78 | .set = xfs_xattr_set, |
Lachlan McIlroy | f9e09f0 | 2008-06-23 13:34:09 +1000 | [diff] [blame] | 79 | }; |
| 80 | |
Lachlan McIlroy | f9e09f0 | 2008-06-23 13:34:09 +1000 | [diff] [blame] | 81 | static struct xattr_handler xfs_xattr_trusted_handler = { |
| 82 | .prefix = XATTR_TRUSTED_PREFIX, |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame^] | 83 | .flags = ATTR_ROOT, |
| 84 | .get = xfs_xattr_get, |
| 85 | .set = xfs_xattr_set, |
Lachlan McIlroy | f9e09f0 | 2008-06-23 13:34:09 +1000 | [diff] [blame] | 86 | }; |
| 87 | |
Lachlan McIlroy | f9e09f0 | 2008-06-23 13:34:09 +1000 | [diff] [blame] | 88 | static struct xattr_handler xfs_xattr_security_handler = { |
| 89 | .prefix = XATTR_SECURITY_PREFIX, |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame^] | 90 | .flags = ATTR_SECURE, |
| 91 | .get = xfs_xattr_get, |
| 92 | .set = xfs_xattr_set, |
Lachlan McIlroy | f9e09f0 | 2008-06-23 13:34:09 +1000 | [diff] [blame] | 93 | }; |
| 94 | |
Lachlan McIlroy | f9e09f0 | 2008-06-23 13:34:09 +1000 | [diff] [blame] | 95 | struct xattr_handler *xfs_xattr_handlers[] = { |
| 96 | &xfs_xattr_user_handler, |
| 97 | &xfs_xattr_trusted_handler, |
| 98 | &xfs_xattr_security_handler, |
Christoph Hellwig | ef14f0c | 2009-06-10 17:07:47 +0200 | [diff] [blame] | 99 | #ifdef CONFIG_XFS_POSIX_ACL |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame^] | 100 | &xfs_xattr_acl_access_handler, |
| 101 | &xfs_xattr_acl_default_handler, |
Christoph Hellwig | ef14f0c | 2009-06-10 17:07:47 +0200 | [diff] [blame] | 102 | #endif |
Lachlan McIlroy | f9e09f0 | 2008-06-23 13:34:09 +1000 | [diff] [blame] | 103 | NULL |
| 104 | }; |
| 105 | |
| 106 | static unsigned int xfs_xattr_prefix_len(int flags) |
| 107 | { |
| 108 | if (flags & XFS_ATTR_SECURE) |
| 109 | return sizeof("security"); |
| 110 | else if (flags & XFS_ATTR_ROOT) |
| 111 | return sizeof("trusted"); |
| 112 | else |
| 113 | return sizeof("user"); |
| 114 | } |
| 115 | |
| 116 | static const char *xfs_xattr_prefix(int flags) |
| 117 | { |
| 118 | if (flags & XFS_ATTR_SECURE) |
| 119 | return xfs_xattr_security_handler.prefix; |
| 120 | else if (flags & XFS_ATTR_ROOT) |
| 121 | return xfs_xattr_trusted_handler.prefix; |
| 122 | else |
| 123 | return xfs_xattr_user_handler.prefix; |
| 124 | } |
| 125 | |
| 126 | static int |
| 127 | xfs_xattr_put_listent(struct xfs_attr_list_context *context, int flags, |
| 128 | char *name, int namelen, int valuelen, char *value) |
| 129 | { |
| 130 | unsigned int prefix_len = xfs_xattr_prefix_len(flags); |
| 131 | char *offset; |
| 132 | int arraytop; |
| 133 | |
| 134 | ASSERT(context->count >= 0); |
| 135 | |
| 136 | /* |
| 137 | * Only show root namespace entries if we are actually allowed to |
| 138 | * see them. |
| 139 | */ |
| 140 | if ((flags & XFS_ATTR_ROOT) && !capable(CAP_SYS_ADMIN)) |
| 141 | return 0; |
| 142 | |
| 143 | arraytop = context->count + prefix_len + namelen + 1; |
| 144 | if (arraytop > context->firstu) { |
| 145 | context->count = -1; /* insufficient space */ |
| 146 | return 1; |
| 147 | } |
| 148 | offset = (char *)context->alist + context->count; |
| 149 | strncpy(offset, xfs_xattr_prefix(flags), prefix_len); |
| 150 | offset += prefix_len; |
| 151 | strncpy(offset, name, namelen); /* real name */ |
| 152 | offset += namelen; |
| 153 | *offset = '\0'; |
| 154 | context->count += prefix_len + namelen + 1; |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | static int |
| 159 | xfs_xattr_put_listent_sizes(struct xfs_attr_list_context *context, int flags, |
| 160 | char *name, int namelen, int valuelen, char *value) |
| 161 | { |
| 162 | context->count += xfs_xattr_prefix_len(flags) + namelen + 1; |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | static int |
| 167 | list_one_attr(const char *name, const size_t len, void *data, |
| 168 | size_t size, ssize_t *result) |
| 169 | { |
| 170 | char *p = data + *result; |
| 171 | |
| 172 | *result += len; |
| 173 | if (!size) |
| 174 | return 0; |
| 175 | if (*result > size) |
| 176 | return -ERANGE; |
| 177 | |
| 178 | strcpy(p, name); |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | ssize_t |
| 183 | xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size) |
| 184 | { |
| 185 | struct xfs_attr_list_context context; |
| 186 | struct attrlist_cursor_kern cursor = { 0 }; |
| 187 | struct inode *inode = dentry->d_inode; |
| 188 | int error; |
| 189 | |
| 190 | /* |
| 191 | * First read the regular on-disk attributes. |
| 192 | */ |
| 193 | memset(&context, 0, sizeof(context)); |
| 194 | context.dp = XFS_I(inode); |
| 195 | context.cursor = &cursor; |
| 196 | context.resynch = 1; |
| 197 | context.alist = data; |
| 198 | context.bufsize = size; |
| 199 | context.firstu = context.bufsize; |
| 200 | |
| 201 | if (size) |
| 202 | context.put_listent = xfs_xattr_put_listent; |
| 203 | else |
| 204 | context.put_listent = xfs_xattr_put_listent_sizes; |
| 205 | |
| 206 | xfs_attr_list_int(&context); |
| 207 | if (context.count < 0) |
| 208 | return -ERANGE; |
| 209 | |
| 210 | /* |
| 211 | * Then add the two synthetic ACL attributes. |
| 212 | */ |
Christoph Hellwig | ef14f0c | 2009-06-10 17:07:47 +0200 | [diff] [blame] | 213 | if (posix_acl_access_exists(inode)) { |
Lachlan McIlroy | f9e09f0 | 2008-06-23 13:34:09 +1000 | [diff] [blame] | 214 | error = list_one_attr(POSIX_ACL_XATTR_ACCESS, |
| 215 | strlen(POSIX_ACL_XATTR_ACCESS) + 1, |
| 216 | data, size, &context.count); |
| 217 | if (error) |
| 218 | return error; |
| 219 | } |
| 220 | |
Christoph Hellwig | ef14f0c | 2009-06-10 17:07:47 +0200 | [diff] [blame] | 221 | if (posix_acl_default_exists(inode)) { |
Lachlan McIlroy | f9e09f0 | 2008-06-23 13:34:09 +1000 | [diff] [blame] | 222 | error = list_one_attr(POSIX_ACL_XATTR_DEFAULT, |
| 223 | strlen(POSIX_ACL_XATTR_DEFAULT) + 1, |
| 224 | data, size, &context.count); |
| 225 | if (error) |
| 226 | return error; |
| 227 | } |
| 228 | |
| 229 | return context.count; |
| 230 | } |