Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * vim: noexpandtab sw=8 ts=8 sts=0: |
| 3 | * |
| 4 | * acl.c |
| 5 | * |
| 6 | * Copyright (C) 2004, 2008 Oracle. All rights reserved. |
| 7 | * |
| 8 | * CREDITS: |
| 9 | * Lots of code in this file is copy from linux/fs/ext3/acl.c. |
| 10 | * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public |
| 14 | * License version 2 as published by the Free Software Foundation. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 19 | * General Public License for more details. |
| 20 | */ |
| 21 | |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 24 | #include <linux/slab.h> |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 25 | #include <linux/string.h> |
| 26 | |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 27 | #include <cluster/masklog.h> |
| 28 | |
| 29 | #include "ocfs2.h" |
| 30 | #include "alloc.h" |
| 31 | #include "dlmglue.h" |
| 32 | #include "file.h" |
Mark Fasheh | fcefd25 | 2010-03-15 15:39:00 -0700 | [diff] [blame] | 33 | #include "inode.h" |
| 34 | #include "journal.h" |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 35 | #include "ocfs2_fs.h" |
| 36 | |
| 37 | #include "xattr.h" |
| 38 | #include "acl.h" |
| 39 | |
| 40 | /* |
| 41 | * Convert from xattr value to acl struct. |
| 42 | */ |
| 43 | static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size) |
| 44 | { |
| 45 | int n, count; |
| 46 | struct posix_acl *acl; |
| 47 | |
| 48 | if (!value) |
| 49 | return NULL; |
| 50 | if (size < sizeof(struct posix_acl_entry)) |
| 51 | return ERR_PTR(-EINVAL); |
| 52 | |
| 53 | count = size / sizeof(struct posix_acl_entry); |
| 54 | if (count < 0) |
| 55 | return ERR_PTR(-EINVAL); |
| 56 | if (count == 0) |
| 57 | return NULL; |
| 58 | |
| 59 | acl = posix_acl_alloc(count, GFP_NOFS); |
| 60 | if (!acl) |
| 61 | return ERR_PTR(-ENOMEM); |
| 62 | for (n = 0; n < count; n++) { |
| 63 | struct ocfs2_acl_entry *entry = |
| 64 | (struct ocfs2_acl_entry *)value; |
| 65 | |
| 66 | acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag); |
| 67 | acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm); |
Eric W. Biederman | 9522751 | 2013-01-31 04:49:40 -0800 | [diff] [blame] | 68 | switch(acl->a_entries[n].e_tag) { |
| 69 | case ACL_USER: |
| 70 | acl->a_entries[n].e_uid = |
| 71 | make_kuid(&init_user_ns, |
| 72 | le32_to_cpu(entry->e_id)); |
| 73 | break; |
| 74 | case ACL_GROUP: |
| 75 | acl->a_entries[n].e_gid = |
| 76 | make_kgid(&init_user_ns, |
| 77 | le32_to_cpu(entry->e_id)); |
| 78 | break; |
| 79 | default: |
| 80 | break; |
| 81 | } |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 82 | value += sizeof(struct posix_acl_entry); |
| 83 | |
| 84 | } |
| 85 | return acl; |
| 86 | } |
| 87 | |
| 88 | /* |
| 89 | * Convert acl struct to xattr value. |
| 90 | */ |
| 91 | static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size) |
| 92 | { |
| 93 | struct ocfs2_acl_entry *entry = NULL; |
| 94 | char *ocfs2_acl; |
| 95 | size_t n; |
| 96 | |
| 97 | *size = acl->a_count * sizeof(struct posix_acl_entry); |
| 98 | |
| 99 | ocfs2_acl = kmalloc(*size, GFP_NOFS); |
| 100 | if (!ocfs2_acl) |
| 101 | return ERR_PTR(-ENOMEM); |
| 102 | |
| 103 | entry = (struct ocfs2_acl_entry *)ocfs2_acl; |
| 104 | for (n = 0; n < acl->a_count; n++, entry++) { |
| 105 | entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag); |
| 106 | entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm); |
Eric W. Biederman | 9522751 | 2013-01-31 04:49:40 -0800 | [diff] [blame] | 107 | switch(acl->a_entries[n].e_tag) { |
| 108 | case ACL_USER: |
| 109 | entry->e_id = cpu_to_le32( |
| 110 | from_kuid(&init_user_ns, |
| 111 | acl->a_entries[n].e_uid)); |
| 112 | break; |
| 113 | case ACL_GROUP: |
| 114 | entry->e_id = cpu_to_le32( |
| 115 | from_kgid(&init_user_ns, |
| 116 | acl->a_entries[n].e_gid)); |
| 117 | break; |
| 118 | default: |
| 119 | entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); |
| 120 | break; |
| 121 | } |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 122 | } |
| 123 | return ocfs2_acl; |
| 124 | } |
| 125 | |
| 126 | static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode, |
| 127 | int type, |
| 128 | struct buffer_head *di_bh) |
| 129 | { |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 130 | int name_index; |
| 131 | char *value = NULL; |
| 132 | struct posix_acl *acl; |
| 133 | int retval; |
| 134 | |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 135 | switch (type) { |
| 136 | case ACL_TYPE_ACCESS: |
| 137 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; |
| 138 | break; |
| 139 | case ACL_TYPE_DEFAULT: |
| 140 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; |
| 141 | break; |
| 142 | default: |
| 143 | return ERR_PTR(-EINVAL); |
| 144 | } |
| 145 | |
| 146 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0); |
| 147 | if (retval > 0) { |
| 148 | value = kmalloc(retval, GFP_NOFS); |
| 149 | if (!value) |
| 150 | return ERR_PTR(-ENOMEM); |
| 151 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, |
| 152 | "", value, retval); |
| 153 | } |
| 154 | |
| 155 | if (retval > 0) |
| 156 | acl = ocfs2_acl_from_xattr(value, retval); |
| 157 | else if (retval == -ENODATA || retval == 0) |
| 158 | acl = NULL; |
| 159 | else |
| 160 | acl = ERR_PTR(retval); |
| 161 | |
| 162 | kfree(value); |
| 163 | |
| 164 | return acl; |
| 165 | } |
| 166 | |
| 167 | |
| 168 | /* |
| 169 | * Get posix acl. |
| 170 | */ |
| 171 | static struct posix_acl *ocfs2_get_acl(struct inode *inode, int type) |
| 172 | { |
| 173 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 174 | struct buffer_head *di_bh = NULL; |
| 175 | struct posix_acl *acl; |
| 176 | int ret; |
| 177 | |
| 178 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
| 179 | return NULL; |
| 180 | |
| 181 | ret = ocfs2_inode_lock(inode, &di_bh, 0); |
| 182 | if (ret < 0) { |
| 183 | mlog_errno(ret); |
| 184 | acl = ERR_PTR(ret); |
| 185 | return acl; |
| 186 | } |
| 187 | |
| 188 | acl = ocfs2_get_acl_nolock(inode, type, di_bh); |
| 189 | |
| 190 | ocfs2_inode_unlock(inode, 0); |
| 191 | |
| 192 | brelse(di_bh); |
| 193 | |
| 194 | return acl; |
| 195 | } |
| 196 | |
| 197 | /* |
Mark Fasheh | fcefd25 | 2010-03-15 15:39:00 -0700 | [diff] [blame] | 198 | * Helper function to set i_mode in memory and disk. Some call paths |
| 199 | * will not have di_bh or a journal handle to pass, in which case it |
| 200 | * will create it's own. |
| 201 | */ |
| 202 | static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh, |
| 203 | handle_t *handle, umode_t new_mode) |
| 204 | { |
| 205 | int ret, commit_handle = 0; |
| 206 | struct ocfs2_dinode *di; |
| 207 | |
| 208 | if (di_bh == NULL) { |
| 209 | ret = ocfs2_read_inode_block(inode, &di_bh); |
| 210 | if (ret) { |
| 211 | mlog_errno(ret); |
| 212 | goto out; |
| 213 | } |
| 214 | } else |
| 215 | get_bh(di_bh); |
| 216 | |
| 217 | if (handle == NULL) { |
| 218 | handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), |
| 219 | OCFS2_INODE_UPDATE_CREDITS); |
| 220 | if (IS_ERR(handle)) { |
| 221 | ret = PTR_ERR(handle); |
| 222 | mlog_errno(ret); |
| 223 | goto out_brelse; |
| 224 | } |
| 225 | |
| 226 | commit_handle = 1; |
| 227 | } |
| 228 | |
| 229 | di = (struct ocfs2_dinode *)di_bh->b_data; |
| 230 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, |
| 231 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 232 | if (ret) { |
| 233 | mlog_errno(ret); |
| 234 | goto out_commit; |
| 235 | } |
| 236 | |
| 237 | inode->i_mode = new_mode; |
Tao Ma | 1282806 | 2010-09-13 14:00:23 +0800 | [diff] [blame] | 238 | inode->i_ctime = CURRENT_TIME; |
Mark Fasheh | fcefd25 | 2010-03-15 15:39:00 -0700 | [diff] [blame] | 239 | di->i_mode = cpu_to_le16(inode->i_mode); |
Tao Ma | 1282806 | 2010-09-13 14:00:23 +0800 | [diff] [blame] | 240 | di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); |
| 241 | di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); |
Mark Fasheh | fcefd25 | 2010-03-15 15:39:00 -0700 | [diff] [blame] | 242 | |
| 243 | ocfs2_journal_dirty(handle, di_bh); |
| 244 | |
| 245 | out_commit: |
| 246 | if (commit_handle) |
| 247 | ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); |
| 248 | out_brelse: |
| 249 | brelse(di_bh); |
| 250 | out: |
| 251 | return ret; |
| 252 | } |
| 253 | |
| 254 | /* |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 255 | * Set the access or default ACL of an inode. |
| 256 | */ |
| 257 | static int ocfs2_set_acl(handle_t *handle, |
| 258 | struct inode *inode, |
| 259 | struct buffer_head *di_bh, |
| 260 | int type, |
| 261 | struct posix_acl *acl, |
| 262 | struct ocfs2_alloc_context *meta_ac, |
| 263 | struct ocfs2_alloc_context *data_ac) |
| 264 | { |
| 265 | int name_index; |
| 266 | void *value = NULL; |
| 267 | size_t size = 0; |
| 268 | int ret; |
| 269 | |
| 270 | if (S_ISLNK(inode->i_mode)) |
| 271 | return -EOPNOTSUPP; |
| 272 | |
| 273 | switch (type) { |
| 274 | case ACL_TYPE_ACCESS: |
| 275 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; |
| 276 | if (acl) { |
Al Viro | d695212 | 2011-07-23 18:56:36 -0400 | [diff] [blame] | 277 | umode_t mode = inode->i_mode; |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 278 | ret = posix_acl_equiv_mode(acl, &mode); |
| 279 | if (ret < 0) |
| 280 | return ret; |
| 281 | else { |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 282 | if (ret == 0) |
| 283 | acl = NULL; |
Mark Fasheh | fcefd25 | 2010-03-15 15:39:00 -0700 | [diff] [blame] | 284 | |
| 285 | ret = ocfs2_acl_set_mode(inode, di_bh, |
| 286 | handle, mode); |
| 287 | if (ret) |
| 288 | return ret; |
| 289 | |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 290 | } |
| 291 | } |
| 292 | break; |
| 293 | case ACL_TYPE_DEFAULT: |
| 294 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; |
| 295 | if (!S_ISDIR(inode->i_mode)) |
| 296 | return acl ? -EACCES : 0; |
| 297 | break; |
| 298 | default: |
| 299 | return -EINVAL; |
| 300 | } |
| 301 | |
| 302 | if (acl) { |
| 303 | value = ocfs2_acl_to_xattr(acl, &size); |
| 304 | if (IS_ERR(value)) |
| 305 | return (int)PTR_ERR(value); |
| 306 | } |
| 307 | |
| 308 | if (handle) |
| 309 | ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index, |
| 310 | "", value, size, 0, |
| 311 | meta_ac, data_ac); |
| 312 | else |
| 313 | ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0); |
| 314 | |
| 315 | kfree(value); |
| 316 | |
| 317 | return ret; |
| 318 | } |
| 319 | |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 320 | struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type) |
Tiger Yang | 23fc270 | 2008-11-14 11:17:18 +0800 | [diff] [blame] | 321 | { |
Nick Piggin | b74c79e | 2011-01-07 17:49:58 +1100 | [diff] [blame] | 322 | struct ocfs2_super *osb; |
Jiaju Zhang | 845b6cf | 2010-07-28 13:21:06 +0800 | [diff] [blame] | 323 | struct buffer_head *di_bh = NULL; |
| 324 | struct posix_acl *acl; |
| 325 | int ret = -EAGAIN; |
Tiger Yang | 23fc270 | 2008-11-14 11:17:18 +0800 | [diff] [blame] | 326 | |
Nick Piggin | b74c79e | 2011-01-07 17:49:58 +1100 | [diff] [blame] | 327 | osb = OCFS2_SB(inode->i_sb); |
Jiaju Zhang | 845b6cf | 2010-07-28 13:21:06 +0800 | [diff] [blame] | 328 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 329 | return NULL; |
Jiaju Zhang | 845b6cf | 2010-07-28 13:21:06 +0800 | [diff] [blame] | 330 | |
| 331 | ret = ocfs2_read_inode_block(inode, &di_bh); |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 332 | if (ret < 0) |
| 333 | return ERR_PTR(ret); |
Jiaju Zhang | 845b6cf | 2010-07-28 13:21:06 +0800 | [diff] [blame] | 334 | |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 335 | acl = ocfs2_get_acl_nolock(inode, type, di_bh); |
Jiaju Zhang | 845b6cf | 2010-07-28 13:21:06 +0800 | [diff] [blame] | 336 | |
| 337 | brelse(di_bh); |
| 338 | |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 339 | return acl; |
Tiger Yang | 23fc270 | 2008-11-14 11:17:18 +0800 | [diff] [blame] | 340 | } |
| 341 | |
Tiger Yang | 060bc66 | 2008-11-14 11:17:29 +0800 | [diff] [blame] | 342 | int ocfs2_acl_chmod(struct inode *inode) |
| 343 | { |
| 344 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
Al Viro | bc26ab5 | 2011-07-23 00:18:02 -0400 | [diff] [blame] | 345 | struct posix_acl *acl; |
Tiger Yang | 060bc66 | 2008-11-14 11:17:29 +0800 | [diff] [blame] | 346 | int ret; |
| 347 | |
| 348 | if (S_ISLNK(inode->i_mode)) |
| 349 | return -EOPNOTSUPP; |
| 350 | |
| 351 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
| 352 | return 0; |
| 353 | |
| 354 | acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS); |
| 355 | if (IS_ERR(acl) || !acl) |
| 356 | return PTR_ERR(acl); |
Al Viro | bc26ab5 | 2011-07-23 00:18:02 -0400 | [diff] [blame] | 357 | ret = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); |
| 358 | if (ret) |
| 359 | return ret; |
| 360 | ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS, |
| 361 | acl, NULL, NULL); |
Tiger Yang | 060bc66 | 2008-11-14 11:17:29 +0800 | [diff] [blame] | 362 | posix_acl_release(acl); |
Tiger Yang | 060bc66 | 2008-11-14 11:17:29 +0800 | [diff] [blame] | 363 | return ret; |
| 364 | } |
| 365 | |
Tiger Yang | 89c38bd | 2008-11-14 11:17:41 +0800 | [diff] [blame] | 366 | /* |
| 367 | * Initialize the ACLs of a new inode. If parent directory has default ACL, |
| 368 | * then clone to new inode. Called from ocfs2_mknod. |
| 369 | */ |
| 370 | int ocfs2_init_acl(handle_t *handle, |
| 371 | struct inode *inode, |
| 372 | struct inode *dir, |
| 373 | struct buffer_head *di_bh, |
| 374 | struct buffer_head *dir_bh, |
| 375 | struct ocfs2_alloc_context *meta_ac, |
| 376 | struct ocfs2_alloc_context *data_ac) |
| 377 | { |
| 378 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 379 | struct posix_acl *acl = NULL; |
Tiger Yang | 6eda3dd | 2010-07-16 11:21:23 +0800 | [diff] [blame] | 380 | int ret = 0, ret2; |
Al Viro | d3fb612 | 2011-07-23 18:37:50 -0400 | [diff] [blame] | 381 | umode_t mode; |
Tiger Yang | 89c38bd | 2008-11-14 11:17:41 +0800 | [diff] [blame] | 382 | |
| 383 | if (!S_ISLNK(inode->i_mode)) { |
| 384 | if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) { |
| 385 | acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT, |
| 386 | dir_bh); |
| 387 | if (IS_ERR(acl)) |
| 388 | return PTR_ERR(acl); |
| 389 | } |
Mark Fasheh | fcefd25 | 2010-03-15 15:39:00 -0700 | [diff] [blame] | 390 | if (!acl) { |
| 391 | mode = inode->i_mode & ~current_umask(); |
| 392 | ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode); |
| 393 | if (ret) { |
| 394 | mlog_errno(ret); |
| 395 | goto cleanup; |
| 396 | } |
| 397 | } |
Tiger Yang | 89c38bd | 2008-11-14 11:17:41 +0800 | [diff] [blame] | 398 | } |
| 399 | if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) { |
Tiger Yang | 89c38bd | 2008-11-14 11:17:41 +0800 | [diff] [blame] | 400 | if (S_ISDIR(inode->i_mode)) { |
| 401 | ret = ocfs2_set_acl(handle, inode, di_bh, |
| 402 | ACL_TYPE_DEFAULT, acl, |
| 403 | meta_ac, data_ac); |
| 404 | if (ret) |
| 405 | goto cleanup; |
| 406 | } |
Tiger Yang | 89c38bd | 2008-11-14 11:17:41 +0800 | [diff] [blame] | 407 | mode = inode->i_mode; |
Al Viro | 826cae2 | 2011-07-23 03:10:32 -0400 | [diff] [blame] | 408 | ret = posix_acl_create(&acl, GFP_NOFS, &mode); |
| 409 | if (ret < 0) |
| 410 | return ret; |
| 411 | |
| 412 | ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode); |
| 413 | if (ret2) { |
| 414 | mlog_errno(ret2); |
| 415 | ret = ret2; |
| 416 | goto cleanup; |
Tiger Yang | 89c38bd | 2008-11-14 11:17:41 +0800 | [diff] [blame] | 417 | } |
Al Viro | 826cae2 | 2011-07-23 03:10:32 -0400 | [diff] [blame] | 418 | if (ret > 0) { |
| 419 | ret = ocfs2_set_acl(handle, inode, |
| 420 | di_bh, ACL_TYPE_ACCESS, |
| 421 | acl, meta_ac, data_ac); |
| 422 | } |
Tiger Yang | 89c38bd | 2008-11-14 11:17:41 +0800 | [diff] [blame] | 423 | } |
| 424 | cleanup: |
| 425 | posix_acl_release(acl); |
| 426 | return ret; |
| 427 | } |
| 428 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 429 | static size_t ocfs2_xattr_list_acl_access(struct dentry *dentry, |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 430 | char *list, |
| 431 | size_t list_len, |
| 432 | const char *name, |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 433 | size_t name_len, |
| 434 | int type) |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 435 | { |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 436 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 437 | const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS); |
| 438 | |
| 439 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
| 440 | return 0; |
| 441 | |
| 442 | if (list && size <= list_len) |
| 443 | memcpy(list, POSIX_ACL_XATTR_ACCESS, size); |
| 444 | return size; |
| 445 | } |
| 446 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 447 | static size_t ocfs2_xattr_list_acl_default(struct dentry *dentry, |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 448 | char *list, |
| 449 | size_t list_len, |
| 450 | const char *name, |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 451 | size_t name_len, |
| 452 | int type) |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 453 | { |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 454 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 455 | const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT); |
| 456 | |
| 457 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
| 458 | return 0; |
| 459 | |
| 460 | if (list && size <= list_len) |
| 461 | memcpy(list, POSIX_ACL_XATTR_DEFAULT, size); |
| 462 | return size; |
| 463 | } |
| 464 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 465 | static int ocfs2_xattr_get_acl(struct dentry *dentry, const char *name, |
| 466 | void *buffer, size_t size, int type) |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 467 | { |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 468 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 469 | struct posix_acl *acl; |
| 470 | int ret; |
| 471 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 472 | if (strcmp(name, "") != 0) |
| 473 | return -EINVAL; |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 474 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
| 475 | return -EOPNOTSUPP; |
| 476 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 477 | acl = ocfs2_get_acl(dentry->d_inode, type); |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 478 | if (IS_ERR(acl)) |
| 479 | return PTR_ERR(acl); |
| 480 | if (acl == NULL) |
| 481 | return -ENODATA; |
Eric W. Biederman | 5f3a4a28 | 2012-09-10 20:17:44 -0700 | [diff] [blame] | 482 | ret = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 483 | posix_acl_release(acl); |
| 484 | |
| 485 | return ret; |
| 486 | } |
| 487 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 488 | static int ocfs2_xattr_set_acl(struct dentry *dentry, const char *name, |
| 489 | const void *value, size_t size, int flags, int type) |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 490 | { |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 491 | struct inode *inode = dentry->d_inode; |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 492 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 493 | struct posix_acl *acl; |
| 494 | int ret = 0; |
| 495 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 496 | if (strcmp(name, "") != 0) |
| 497 | return -EINVAL; |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 498 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
| 499 | return -EOPNOTSUPP; |
| 500 | |
Serge E. Hallyn | 2e14967 | 2011-03-23 16:43:26 -0700 | [diff] [blame] | 501 | if (!inode_owner_or_capable(inode)) |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 502 | return -EPERM; |
| 503 | |
| 504 | if (value) { |
Eric W. Biederman | 5f3a4a28 | 2012-09-10 20:17:44 -0700 | [diff] [blame] | 505 | acl = posix_acl_from_xattr(&init_user_ns, value, size); |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 506 | if (IS_ERR(acl)) |
| 507 | return PTR_ERR(acl); |
| 508 | else if (acl) { |
| 509 | ret = posix_acl_valid(acl); |
| 510 | if (ret) |
| 511 | goto cleanup; |
| 512 | } |
| 513 | } else |
| 514 | acl = NULL; |
| 515 | |
| 516 | ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL); |
| 517 | |
| 518 | cleanup: |
| 519 | posix_acl_release(acl); |
| 520 | return ret; |
| 521 | } |
| 522 | |
Stephen Hemminger | 537d81c | 2010-05-13 17:53:22 -0700 | [diff] [blame] | 523 | const struct xattr_handler ocfs2_xattr_acl_access_handler = { |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 524 | .prefix = POSIX_ACL_XATTR_ACCESS, |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 525 | .flags = ACL_TYPE_ACCESS, |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 526 | .list = ocfs2_xattr_list_acl_access, |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 527 | .get = ocfs2_xattr_get_acl, |
| 528 | .set = ocfs2_xattr_set_acl, |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 529 | }; |
| 530 | |
Stephen Hemminger | 537d81c | 2010-05-13 17:53:22 -0700 | [diff] [blame] | 531 | const struct xattr_handler ocfs2_xattr_acl_default_handler = { |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 532 | .prefix = POSIX_ACL_XATTR_DEFAULT, |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 533 | .flags = ACL_TYPE_DEFAULT, |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 534 | .list = ocfs2_xattr_list_acl_default, |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 535 | .get = ocfs2_xattr_get_acl, |
| 536 | .set = ocfs2_xattr_set_acl, |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 537 | }; |