1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * Copyright (C) 2004, 2008 Oracle. All rights reserved.
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>
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.
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.
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/string.h>
26 #define MLOG_MASK_PREFIX ML_INODE
27 #include <cluster/masklog.h>
39 * Convert from xattr value to acl struct.
41 static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size)
44 struct posix_acl *acl;
48 if (size < sizeof(struct posix_acl_entry))
49 return ERR_PTR(-EINVAL);
51 count = size / sizeof(struct posix_acl_entry);
53 return ERR_PTR(-EINVAL);
57 acl = posix_acl_alloc(count, GFP_NOFS);
59 return ERR_PTR(-ENOMEM);
60 for (n = 0; n < count; n++) {
61 struct ocfs2_acl_entry *entry =
62 (struct ocfs2_acl_entry *)value;
64 acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
65 acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
66 acl->a_entries[n].e_id = le32_to_cpu(entry->e_id);
67 value += sizeof(struct posix_acl_entry);
74 * Convert acl struct to xattr value.
76 static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size)
78 struct ocfs2_acl_entry *entry = NULL;
82 *size = acl->a_count * sizeof(struct posix_acl_entry);
84 ocfs2_acl = kmalloc(*size, GFP_NOFS);
86 return ERR_PTR(-ENOMEM);
88 entry = (struct ocfs2_acl_entry *)ocfs2_acl;
89 for (n = 0; n < acl->a_count; n++, entry++) {
90 entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
91 entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
92 entry->e_id = cpu_to_le32(acl->a_entries[n].e_id);
97 static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode,
99 struct buffer_head *di_bh)
101 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
104 struct posix_acl *acl;
107 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
111 case ACL_TYPE_ACCESS:
112 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
114 case ACL_TYPE_DEFAULT:
115 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
118 return ERR_PTR(-EINVAL);
121 retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0);
123 value = kmalloc(retval, GFP_NOFS);
125 return ERR_PTR(-ENOMEM);
126 retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
131 acl = ocfs2_acl_from_xattr(value, retval);
132 else if (retval == -ENODATA || retval == 0)
135 acl = ERR_PTR(retval);
146 static struct posix_acl *ocfs2_get_acl(struct inode *inode, int type)
148 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
149 struct buffer_head *di_bh = NULL;
150 struct posix_acl *acl;
153 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
156 ret = ocfs2_inode_lock(inode, &di_bh, 0);
163 acl = ocfs2_get_acl_nolock(inode, type, di_bh);
165 ocfs2_inode_unlock(inode, 0);
173 * Set the access or default ACL of an inode.
175 static int ocfs2_set_acl(handle_t *handle,
177 struct buffer_head *di_bh,
179 struct posix_acl *acl,
180 struct ocfs2_alloc_context *meta_ac,
181 struct ocfs2_alloc_context *data_ac)
188 if (S_ISLNK(inode->i_mode))
192 case ACL_TYPE_ACCESS:
193 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
195 mode_t mode = inode->i_mode;
196 ret = posix_acl_equiv_mode(acl, &mode);
200 inode->i_mode = mode;
206 case ACL_TYPE_DEFAULT:
207 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
208 if (!S_ISDIR(inode->i_mode))
209 return acl ? -EACCES : 0;
216 value = ocfs2_acl_to_xattr(acl, &size);
218 return (int)PTR_ERR(value);
222 ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
226 ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
233 int ocfs2_check_acl(struct inode *inode, int mask)
235 struct posix_acl *acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
240 int ret = posix_acl_permission(inode, acl, mask);
241 posix_acl_release(acl);
248 int ocfs2_acl_chmod(struct inode *inode)
250 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
251 struct posix_acl *acl, *clone;
254 if (S_ISLNK(inode->i_mode))
257 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
260 acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS);
261 if (IS_ERR(acl) || !acl)
263 clone = posix_acl_clone(acl, GFP_KERNEL);
264 posix_acl_release(acl);
267 ret = posix_acl_chmod_masq(clone, inode->i_mode);
269 ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
271 posix_acl_release(clone);
275 static size_t ocfs2_xattr_list_acl_access(struct inode *inode,
281 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
282 const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
284 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
287 if (list && size <= list_len)
288 memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
292 static size_t ocfs2_xattr_list_acl_default(struct inode *inode,
298 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
299 const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
301 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
304 if (list && size <= list_len)
305 memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
309 static int ocfs2_xattr_get_acl(struct inode *inode,
314 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
315 struct posix_acl *acl;
318 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
321 acl = ocfs2_get_acl(inode, type);
326 ret = posix_acl_to_xattr(acl, buffer, size);
327 posix_acl_release(acl);
332 static int ocfs2_xattr_get_acl_access(struct inode *inode,
337 if (strcmp(name, "") != 0)
339 return ocfs2_xattr_get_acl(inode, ACL_TYPE_ACCESS, buffer, size);
342 static int ocfs2_xattr_get_acl_default(struct inode *inode,
347 if (strcmp(name, "") != 0)
349 return ocfs2_xattr_get_acl(inode, ACL_TYPE_DEFAULT, buffer, size);
352 static int ocfs2_xattr_set_acl(struct inode *inode,
357 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
358 struct posix_acl *acl;
361 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
364 if (!is_owner_or_cap(inode))
368 acl = posix_acl_from_xattr(value, size);
372 ret = posix_acl_valid(acl);
379 ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
382 posix_acl_release(acl);
386 static int ocfs2_xattr_set_acl_access(struct inode *inode,
392 if (strcmp(name, "") != 0)
394 return ocfs2_xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size);
397 static int ocfs2_xattr_set_acl_default(struct inode *inode,
403 if (strcmp(name, "") != 0)
405 return ocfs2_xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size);
408 struct xattr_handler ocfs2_xattr_acl_access_handler = {
409 .prefix = POSIX_ACL_XATTR_ACCESS,
410 .list = ocfs2_xattr_list_acl_access,
411 .get = ocfs2_xattr_get_acl_access,
412 .set = ocfs2_xattr_set_acl_access,
415 struct xattr_handler ocfs2_xattr_acl_default_handler = {
416 .prefix = POSIX_ACL_XATTR_DEFAULT,
417 .list = ocfs2_xattr_list_acl_default,
418 .get = ocfs2_xattr_get_acl_default,
419 .set = ocfs2_xattr_set_acl_default,