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); |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 54 | |
| 55 | acl = posix_acl_alloc(count, GFP_NOFS); |
| 56 | if (!acl) |
| 57 | return ERR_PTR(-ENOMEM); |
| 58 | for (n = 0; n < count; n++) { |
| 59 | struct ocfs2_acl_entry *entry = |
| 60 | (struct ocfs2_acl_entry *)value; |
| 61 | |
| 62 | acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag); |
| 63 | 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] | 64 | switch(acl->a_entries[n].e_tag) { |
| 65 | case ACL_USER: |
| 66 | acl->a_entries[n].e_uid = |
| 67 | make_kuid(&init_user_ns, |
| 68 | le32_to_cpu(entry->e_id)); |
| 69 | break; |
| 70 | case ACL_GROUP: |
| 71 | acl->a_entries[n].e_gid = |
| 72 | make_kgid(&init_user_ns, |
| 73 | le32_to_cpu(entry->e_id)); |
| 74 | break; |
| 75 | default: |
| 76 | break; |
| 77 | } |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 78 | value += sizeof(struct posix_acl_entry); |
| 79 | |
| 80 | } |
| 81 | return acl; |
| 82 | } |
| 83 | |
| 84 | /* |
| 85 | * Convert acl struct to xattr value. |
| 86 | */ |
| 87 | static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size) |
| 88 | { |
| 89 | struct ocfs2_acl_entry *entry = NULL; |
| 90 | char *ocfs2_acl; |
| 91 | size_t n; |
| 92 | |
| 93 | *size = acl->a_count * sizeof(struct posix_acl_entry); |
| 94 | |
| 95 | ocfs2_acl = kmalloc(*size, GFP_NOFS); |
| 96 | if (!ocfs2_acl) |
| 97 | return ERR_PTR(-ENOMEM); |
| 98 | |
| 99 | entry = (struct ocfs2_acl_entry *)ocfs2_acl; |
| 100 | for (n = 0; n < acl->a_count; n++, entry++) { |
| 101 | entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag); |
| 102 | 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] | 103 | switch(acl->a_entries[n].e_tag) { |
| 104 | case ACL_USER: |
| 105 | entry->e_id = cpu_to_le32( |
| 106 | from_kuid(&init_user_ns, |
| 107 | acl->a_entries[n].e_uid)); |
| 108 | break; |
| 109 | case ACL_GROUP: |
| 110 | entry->e_id = cpu_to_le32( |
| 111 | from_kgid(&init_user_ns, |
| 112 | acl->a_entries[n].e_gid)); |
| 113 | break; |
| 114 | default: |
| 115 | entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); |
| 116 | break; |
| 117 | } |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 118 | } |
| 119 | return ocfs2_acl; |
| 120 | } |
| 121 | |
| 122 | static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode, |
| 123 | int type, |
| 124 | struct buffer_head *di_bh) |
| 125 | { |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 126 | int name_index; |
| 127 | char *value = NULL; |
| 128 | struct posix_acl *acl; |
| 129 | int retval; |
| 130 | |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 131 | switch (type) { |
| 132 | case ACL_TYPE_ACCESS: |
| 133 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; |
| 134 | break; |
| 135 | case ACL_TYPE_DEFAULT: |
| 136 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; |
| 137 | break; |
| 138 | default: |
| 139 | return ERR_PTR(-EINVAL); |
| 140 | } |
| 141 | |
| 142 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0); |
| 143 | if (retval > 0) { |
| 144 | value = kmalloc(retval, GFP_NOFS); |
| 145 | if (!value) |
| 146 | return ERR_PTR(-ENOMEM); |
| 147 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, |
| 148 | "", value, retval); |
| 149 | } |
| 150 | |
| 151 | if (retval > 0) |
| 152 | acl = ocfs2_acl_from_xattr(value, retval); |
| 153 | else if (retval == -ENODATA || retval == 0) |
| 154 | acl = NULL; |
| 155 | else |
| 156 | acl = ERR_PTR(retval); |
| 157 | |
| 158 | kfree(value); |
| 159 | |
| 160 | return acl; |
| 161 | } |
| 162 | |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 163 | /* |
Mark Fasheh | fcefd25 | 2010-03-15 15:39:00 -0700 | [diff] [blame] | 164 | * Helper function to set i_mode in memory and disk. Some call paths |
| 165 | * will not have di_bh or a journal handle to pass, in which case it |
| 166 | * will create it's own. |
| 167 | */ |
| 168 | static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh, |
| 169 | handle_t *handle, umode_t new_mode) |
| 170 | { |
| 171 | int ret, commit_handle = 0; |
| 172 | struct ocfs2_dinode *di; |
| 173 | |
| 174 | if (di_bh == NULL) { |
| 175 | ret = ocfs2_read_inode_block(inode, &di_bh); |
| 176 | if (ret) { |
| 177 | mlog_errno(ret); |
| 178 | goto out; |
| 179 | } |
| 180 | } else |
| 181 | get_bh(di_bh); |
| 182 | |
| 183 | if (handle == NULL) { |
| 184 | handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), |
| 185 | OCFS2_INODE_UPDATE_CREDITS); |
| 186 | if (IS_ERR(handle)) { |
| 187 | ret = PTR_ERR(handle); |
| 188 | mlog_errno(ret); |
| 189 | goto out_brelse; |
| 190 | } |
| 191 | |
| 192 | commit_handle = 1; |
| 193 | } |
| 194 | |
| 195 | di = (struct ocfs2_dinode *)di_bh->b_data; |
| 196 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, |
| 197 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 198 | if (ret) { |
| 199 | mlog_errno(ret); |
| 200 | goto out_commit; |
| 201 | } |
| 202 | |
| 203 | inode->i_mode = new_mode; |
Tao Ma | 1282806 | 2010-09-13 14:00:23 +0800 | [diff] [blame] | 204 | inode->i_ctime = CURRENT_TIME; |
Mark Fasheh | fcefd25 | 2010-03-15 15:39:00 -0700 | [diff] [blame] | 205 | di->i_mode = cpu_to_le16(inode->i_mode); |
Tao Ma | 1282806 | 2010-09-13 14:00:23 +0800 | [diff] [blame] | 206 | di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); |
| 207 | di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); |
Darrick J. Wong | 6fdb702 | 2014-04-03 14:47:08 -0700 | [diff] [blame] | 208 | ocfs2_update_inode_fsync_trans(handle, inode, 0); |
Mark Fasheh | fcefd25 | 2010-03-15 15:39:00 -0700 | [diff] [blame] | 209 | |
| 210 | ocfs2_journal_dirty(handle, di_bh); |
| 211 | |
| 212 | out_commit: |
| 213 | if (commit_handle) |
| 214 | ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); |
| 215 | out_brelse: |
| 216 | brelse(di_bh); |
| 217 | out: |
| 218 | return ret; |
| 219 | } |
| 220 | |
| 221 | /* |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 222 | * Set the access or default ACL of an inode. |
| 223 | */ |
Christoph Hellwig | 702e5bc | 2013-12-20 05:16:48 -0800 | [diff] [blame] | 224 | int ocfs2_set_acl(handle_t *handle, |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 225 | struct inode *inode, |
| 226 | struct buffer_head *di_bh, |
| 227 | int type, |
| 228 | struct posix_acl *acl, |
| 229 | struct ocfs2_alloc_context *meta_ac, |
| 230 | struct ocfs2_alloc_context *data_ac) |
| 231 | { |
| 232 | int name_index; |
| 233 | void *value = NULL; |
| 234 | size_t size = 0; |
| 235 | int ret; |
| 236 | |
| 237 | if (S_ISLNK(inode->i_mode)) |
| 238 | return -EOPNOTSUPP; |
| 239 | |
| 240 | switch (type) { |
| 241 | case ACL_TYPE_ACCESS: |
| 242 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; |
| 243 | if (acl) { |
Al Viro | d695212 | 2011-07-23 18:56:36 -0400 | [diff] [blame] | 244 | umode_t mode = inode->i_mode; |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 245 | ret = posix_acl_equiv_mode(acl, &mode); |
| 246 | if (ret < 0) |
| 247 | return ret; |
Mark Fasheh | fcefd25 | 2010-03-15 15:39:00 -0700 | [diff] [blame] | 248 | |
Fabian Frederick | e6e7461 | 2015-02-10 14:08:43 -0800 | [diff] [blame] | 249 | if (ret == 0) |
| 250 | acl = NULL; |
Mark Fasheh | fcefd25 | 2010-03-15 15:39:00 -0700 | [diff] [blame] | 251 | |
Fabian Frederick | e6e7461 | 2015-02-10 14:08:43 -0800 | [diff] [blame] | 252 | ret = ocfs2_acl_set_mode(inode, di_bh, |
| 253 | handle, mode); |
| 254 | if (ret) |
| 255 | return ret; |
Tiger Yang | 929fb01 | 2008-11-14 11:17:04 +0800 | [diff] [blame] | 256 | } |
| 257 | break; |
| 258 | case ACL_TYPE_DEFAULT: |
| 259 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; |
| 260 | if (!S_ISDIR(inode->i_mode)) |
| 261 | return acl ? -EACCES : 0; |
| 262 | break; |
| 263 | default: |
| 264 | return -EINVAL; |
| 265 | } |
| 266 | |
| 267 | if (acl) { |
| 268 | value = ocfs2_acl_to_xattr(acl, &size); |
| 269 | if (IS_ERR(value)) |
| 270 | return (int)PTR_ERR(value); |
| 271 | } |
| 272 | |
| 273 | if (handle) |
| 274 | ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index, |
| 275 | "", value, size, 0, |
| 276 | meta_ac, data_ac); |
| 277 | else |
| 278 | ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0); |
| 279 | |
| 280 | kfree(value); |
| 281 | |
| 282 | return ret; |
| 283 | } |
| 284 | |
Christoph Hellwig | 702e5bc | 2013-12-20 05:16:48 -0800 | [diff] [blame] | 285 | int ocfs2_iop_set_acl(struct inode *inode, struct posix_acl *acl, int type) |
| 286 | { |
Tariq Saeed | 743b5f1 | 2015-09-04 15:44:34 -0700 | [diff] [blame] | 287 | struct buffer_head *bh = NULL; |
| 288 | int status = 0; |
| 289 | |
| 290 | status = ocfs2_inode_lock(inode, &bh, 1); |
| 291 | if (status < 0) { |
| 292 | if (status != -ENOENT) |
| 293 | mlog_errno(status); |
| 294 | return status; |
| 295 | } |
| 296 | status = ocfs2_set_acl(NULL, inode, bh, type, acl, NULL, NULL); |
| 297 | ocfs2_inode_unlock(inode, 1); |
| 298 | brelse(bh); |
| 299 | return status; |
Christoph Hellwig | 702e5bc | 2013-12-20 05:16:48 -0800 | [diff] [blame] | 300 | } |
| 301 | |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 302 | struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type) |
Tiger Yang | 23fc270 | 2008-11-14 11:17:18 +0800 | [diff] [blame] | 303 | { |
Nick Piggin | b74c79e | 2011-01-07 17:49:58 +1100 | [diff] [blame] | 304 | struct ocfs2_super *osb; |
Jiaju Zhang | 845b6cf | 2010-07-28 13:21:06 +0800 | [diff] [blame] | 305 | struct buffer_head *di_bh = NULL; |
| 306 | struct posix_acl *acl; |
Tariq Saeed | 743b5f1 | 2015-09-04 15:44:34 -0700 | [diff] [blame] | 307 | int ret; |
Tiger Yang | 23fc270 | 2008-11-14 11:17:18 +0800 | [diff] [blame] | 308 | |
Nick Piggin | b74c79e | 2011-01-07 17:49:58 +1100 | [diff] [blame] | 309 | osb = OCFS2_SB(inode->i_sb); |
Jiaju Zhang | 845b6cf | 2010-07-28 13:21:06 +0800 | [diff] [blame] | 310 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 311 | return NULL; |
Tariq Saeed | 743b5f1 | 2015-09-04 15:44:34 -0700 | [diff] [blame] | 312 | ret = ocfs2_inode_lock(inode, &di_bh, 0); |
| 313 | if (ret < 0) { |
| 314 | if (ret != -ENOENT) |
| 315 | mlog_errno(ret); |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 316 | return ERR_PTR(ret); |
Tariq Saeed | 743b5f1 | 2015-09-04 15:44:34 -0700 | [diff] [blame] | 317 | } |
Jiaju Zhang | 845b6cf | 2010-07-28 13:21:06 +0800 | [diff] [blame] | 318 | |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 319 | acl = ocfs2_get_acl_nolock(inode, type, di_bh); |
Jiaju Zhang | 845b6cf | 2010-07-28 13:21:06 +0800 | [diff] [blame] | 320 | |
Tariq Saeed | 743b5f1 | 2015-09-04 15:44:34 -0700 | [diff] [blame] | 321 | ocfs2_inode_unlock(inode, 0); |
Jiaju Zhang | 845b6cf | 2010-07-28 13:21:06 +0800 | [diff] [blame] | 322 | brelse(di_bh); |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 323 | return acl; |
Tiger Yang | 23fc270 | 2008-11-14 11:17:18 +0800 | [diff] [blame] | 324 | } |
Junxiao Bi | 5ee0fbd | 2016-05-12 15:42:15 -0700 | [diff] [blame] | 325 | |
| 326 | int ocfs2_acl_chmod(struct inode *inode, struct buffer_head *bh) |
| 327 | { |
| 328 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 329 | struct posix_acl *acl; |
| 330 | int ret; |
| 331 | |
| 332 | if (S_ISLNK(inode->i_mode)) |
| 333 | return -EOPNOTSUPP; |
| 334 | |
| 335 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
| 336 | return 0; |
| 337 | |
| 338 | acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, bh); |
| 339 | if (IS_ERR(acl) || !acl) |
| 340 | return PTR_ERR(acl); |
| 341 | ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); |
| 342 | if (ret) |
| 343 | return ret; |
| 344 | ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS, |
| 345 | acl, NULL, NULL); |
| 346 | posix_acl_release(acl); |
| 347 | return ret; |
| 348 | } |
Junxiao Bi | c25a1e0 | 2016-05-12 15:42:18 -0700 | [diff] [blame] | 349 | |
| 350 | /* |
| 351 | * Initialize the ACLs of a new inode. If parent directory has default ACL, |
| 352 | * then clone to new inode. Called from ocfs2_mknod. |
| 353 | */ |
| 354 | int ocfs2_init_acl(handle_t *handle, |
| 355 | struct inode *inode, |
| 356 | struct inode *dir, |
| 357 | struct buffer_head *di_bh, |
| 358 | struct buffer_head *dir_bh, |
| 359 | struct ocfs2_alloc_context *meta_ac, |
| 360 | struct ocfs2_alloc_context *data_ac) |
| 361 | { |
| 362 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 363 | struct posix_acl *acl = NULL; |
| 364 | int ret = 0, ret2; |
| 365 | umode_t mode; |
| 366 | |
| 367 | if (!S_ISLNK(inode->i_mode)) { |
| 368 | if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) { |
| 369 | acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT, |
| 370 | dir_bh); |
| 371 | if (IS_ERR(acl)) |
| 372 | return PTR_ERR(acl); |
| 373 | } |
| 374 | if (!acl) { |
| 375 | mode = inode->i_mode & ~current_umask(); |
| 376 | ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode); |
| 377 | if (ret) { |
| 378 | mlog_errno(ret); |
| 379 | goto cleanup; |
| 380 | } |
| 381 | } |
| 382 | } |
| 383 | if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) { |
| 384 | if (S_ISDIR(inode->i_mode)) { |
| 385 | ret = ocfs2_set_acl(handle, inode, di_bh, |
| 386 | ACL_TYPE_DEFAULT, acl, |
| 387 | meta_ac, data_ac); |
| 388 | if (ret) |
| 389 | goto cleanup; |
| 390 | } |
| 391 | mode = inode->i_mode; |
| 392 | ret = __posix_acl_create(&acl, GFP_NOFS, &mode); |
| 393 | if (ret < 0) |
| 394 | return ret; |
| 395 | |
| 396 | ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode); |
| 397 | if (ret2) { |
| 398 | mlog_errno(ret2); |
| 399 | ret = ret2; |
| 400 | goto cleanup; |
| 401 | } |
| 402 | if (ret > 0) { |
| 403 | ret = ocfs2_set_acl(handle, inode, |
| 404 | di_bh, ACL_TYPE_ACCESS, |
| 405 | acl, meta_ac, data_ac); |
| 406 | } |
| 407 | } |
| 408 | cleanup: |
| 409 | posix_acl_release(acl); |
| 410 | return ret; |
| 411 | } |