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/slab.h>
25 #include <linux/string.h>
27 #include <cluster/masklog.h>
41 * Convert from xattr value to acl struct.
43 static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size)
46 struct posix_acl *acl;
50 if (size < sizeof(struct posix_acl_entry))
51 return ERR_PTR(-EINVAL);
53 count = size / sizeof(struct posix_acl_entry);
55 acl = posix_acl_alloc(count, GFP_NOFS);
57 return ERR_PTR(-ENOMEM);
58 for (n = 0; n < count; n++) {
59 struct ocfs2_acl_entry *entry =
60 (struct ocfs2_acl_entry *)value;
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);
64 switch(acl->a_entries[n].e_tag) {
66 acl->a_entries[n].e_uid =
67 make_kuid(&init_user_ns,
68 le32_to_cpu(entry->e_id));
71 acl->a_entries[n].e_gid =
72 make_kgid(&init_user_ns,
73 le32_to_cpu(entry->e_id));
78 value += sizeof(struct posix_acl_entry);
85 * Convert acl struct to xattr value.
87 static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size)
89 struct ocfs2_acl_entry *entry = NULL;
93 *size = acl->a_count * sizeof(struct posix_acl_entry);
95 ocfs2_acl = kmalloc(*size, GFP_NOFS);
97 return ERR_PTR(-ENOMEM);
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);
103 switch(acl->a_entries[n].e_tag) {
105 entry->e_id = cpu_to_le32(
106 from_kuid(&init_user_ns,
107 acl->a_entries[n].e_uid));
110 entry->e_id = cpu_to_le32(
111 from_kgid(&init_user_ns,
112 acl->a_entries[n].e_gid));
115 entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
122 static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode,
124 struct buffer_head *di_bh)
128 struct posix_acl *acl;
132 case ACL_TYPE_ACCESS:
133 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
135 case ACL_TYPE_DEFAULT:
136 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
139 return ERR_PTR(-EINVAL);
142 retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0);
144 value = kmalloc(retval, GFP_NOFS);
146 return ERR_PTR(-ENOMEM);
147 retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
152 acl = ocfs2_acl_from_xattr(value, retval);
153 else if (retval == -ENODATA || retval == 0)
156 acl = ERR_PTR(retval);
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.
168 static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh,
169 handle_t *handle, umode_t new_mode)
171 int ret, commit_handle = 0;
172 struct ocfs2_dinode *di;
175 ret = ocfs2_read_inode_block(inode, &di_bh);
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);
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);
203 inode->i_mode = new_mode;
204 inode->i_ctime = CURRENT_TIME;
205 di->i_mode = cpu_to_le16(inode->i_mode);
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);
208 ocfs2_update_inode_fsync_trans(handle, inode, 0);
210 ocfs2_journal_dirty(handle, di_bh);
214 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
222 * Set the access or default ACL of an inode.
224 int ocfs2_set_acl(handle_t *handle,
226 struct buffer_head *di_bh,
228 struct posix_acl *acl,
229 struct ocfs2_alloc_context *meta_ac,
230 struct ocfs2_alloc_context *data_ac)
237 if (S_ISLNK(inode->i_mode))
241 case ACL_TYPE_ACCESS:
242 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
244 umode_t mode = inode->i_mode;
245 ret = posix_acl_equiv_mode(acl, &mode);
252 ret = ocfs2_acl_set_mode(inode, di_bh,
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;
268 value = ocfs2_acl_to_xattr(acl, &size);
270 return (int)PTR_ERR(value);
274 ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
278 ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
285 int ocfs2_iop_set_acl(struct inode *inode, struct posix_acl *acl, int type)
287 struct buffer_head *bh = NULL;
290 status = ocfs2_inode_lock(inode, &bh, 1);
292 if (status != -ENOENT)
296 status = ocfs2_set_acl(NULL, inode, bh, type, acl, NULL, NULL);
297 ocfs2_inode_unlock(inode, 1);
302 struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type)
304 struct ocfs2_super *osb;
305 struct buffer_head *di_bh = NULL;
306 struct posix_acl *acl;
309 osb = OCFS2_SB(inode->i_sb);
310 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
312 ret = ocfs2_inode_lock(inode, &di_bh, 0);
319 acl = ocfs2_get_acl_nolock(inode, type, di_bh);
321 ocfs2_inode_unlock(inode, 0);