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Guangliang Zhao7221fe42013-11-11 15:18:03 +08001/*
2 * linux/fs/ceph/acl.c
3 *
4 * Copyright (C) 2013 Guangliang Zhao, <lucienchao@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public
8 * License v2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public
16 * License along with this program; if not, write to the
17 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 * Boston, MA 021110-1307, USA.
19 */
20
21#include <linux/ceph/ceph_debug.h>
22#include <linux/fs.h>
23#include <linux/string.h>
24#include <linux/xattr.h>
25#include <linux/posix_acl_xattr.h>
26#include <linux/posix_acl.h>
27#include <linux/sched.h>
28#include <linux/slab.h>
29
30#include "super.h"
31
32static inline void ceph_set_cached_acl(struct inode *inode,
33 int type, struct posix_acl *acl)
34{
35 struct ceph_inode_info *ci = ceph_inode(inode);
36
37 spin_lock(&ci->i_ceph_lock);
38 if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0))
39 set_cached_acl(inode, type, acl);
40 spin_unlock(&ci->i_ceph_lock);
41}
42
43static inline struct posix_acl *ceph_get_cached_acl(struct inode *inode,
44 int type)
45{
46 struct ceph_inode_info *ci = ceph_inode(inode);
47 struct posix_acl *acl = ACL_NOT_CACHED;
48
49 spin_lock(&ci->i_ceph_lock);
50 if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0))
51 acl = get_cached_acl(inode, type);
52 spin_unlock(&ci->i_ceph_lock);
53
54 return acl;
55}
56
Guangliang Zhao7221fe42013-11-11 15:18:03 +080057struct posix_acl *ceph_get_acl(struct inode *inode, int type)
58{
59 int size;
60 const char *name;
61 char *value = NULL;
62 struct posix_acl *acl;
63
Guangliang Zhao7221fe42013-11-11 15:18:03 +080064 switch (type) {
65 case ACL_TYPE_ACCESS:
66 name = POSIX_ACL_XATTR_ACCESS;
67 break;
68 case ACL_TYPE_DEFAULT:
69 name = POSIX_ACL_XATTR_DEFAULT;
70 break;
71 default:
72 BUG();
73 }
74
75 size = __ceph_getxattr(inode, name, "", 0);
76 if (size > 0) {
77 value = kzalloc(size, GFP_NOFS);
78 if (!value)
79 return ERR_PTR(-ENOMEM);
80 size = __ceph_getxattr(inode, name, value, size);
81 }
82
83 if (size > 0)
84 acl = posix_acl_from_xattr(&init_user_ns, value, size);
85 else if (size == -ERANGE || size == -ENODATA || size == 0)
86 acl = NULL;
87 else
88 acl = ERR_PTR(-EIO);
89
90 kfree(value);
91
92 if (!IS_ERR(acl))
93 ceph_set_cached_acl(inode, type, acl);
94
95 return acl;
96}
97
Sage Weil72466d02014-01-29 06:22:25 -080098int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type)
Guangliang Zhao7221fe42013-11-11 15:18:03 +080099{
100 int ret = 0, size = 0;
101 const char *name = NULL;
102 char *value = NULL;
103 struct iattr newattrs;
104 umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;
Sage Weil77516dc2014-01-31 07:25:25 -0800105 struct dentry *dentry;
Guangliang Zhao7221fe42013-11-11 15:18:03 +0800106
Guangliang Zhao7221fe42013-11-11 15:18:03 +0800107 switch (type) {
108 case ACL_TYPE_ACCESS:
109 name = POSIX_ACL_XATTR_ACCESS;
110 if (acl) {
111 ret = posix_acl_equiv_mode(acl, &new_mode);
112 if (ret < 0)
113 goto out;
114 if (ret == 0)
115 acl = NULL;
116 }
117 break;
118 case ACL_TYPE_DEFAULT:
119 if (!S_ISDIR(inode->i_mode)) {
120 ret = acl ? -EINVAL : 0;
121 goto out;
122 }
123 name = POSIX_ACL_XATTR_DEFAULT;
124 break;
125 default:
126 ret = -EINVAL;
127 goto out;
128 }
129
130 if (acl) {
131 size = posix_acl_xattr_size(acl->a_count);
132 value = kmalloc(size, GFP_NOFS);
133 if (!value) {
134 ret = -ENOMEM;
135 goto out;
136 }
137
138 ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
139 if (ret < 0)
140 goto out_free;
141 }
142
Sage Weil77516dc2014-01-31 07:25:25 -0800143 dentry = d_find_alias(inode);
Guangliang Zhao7221fe42013-11-11 15:18:03 +0800144 if (new_mode != old_mode) {
145 newattrs.ia_mode = new_mode;
146 newattrs.ia_valid = ATTR_MODE;
147 ret = ceph_setattr(dentry, &newattrs);
148 if (ret)
Sage Weil77516dc2014-01-31 07:25:25 -0800149 goto out_dput;
Guangliang Zhao7221fe42013-11-11 15:18:03 +0800150 }
151
Yan, Zheng7a92d642014-02-11 13:08:51 +0800152 ret = __ceph_setxattr(dentry, name, value, size, 0);
Guangliang Zhao7221fe42013-11-11 15:18:03 +0800153 if (ret) {
154 if (new_mode != old_mode) {
155 newattrs.ia_mode = old_mode;
156 newattrs.ia_valid = ATTR_MODE;
157 ceph_setattr(dentry, &newattrs);
158 }
Sage Weil77516dc2014-01-31 07:25:25 -0800159 goto out_dput;
Guangliang Zhao7221fe42013-11-11 15:18:03 +0800160 }
161
162 ceph_set_cached_acl(inode, type, acl);
163
Sage Weil77516dc2014-01-31 07:25:25 -0800164out_dput:
165 dput(dentry);
Guangliang Zhao7221fe42013-11-11 15:18:03 +0800166out_free:
167 kfree(value);
168out:
169 return ret;
170}
171
172int ceph_init_acl(struct dentry *dentry, struct inode *inode, struct inode *dir)
173{
Christoph Hellwig75858232014-01-30 08:56:36 -0800174 struct posix_acl *default_acl, *acl;
Yan, Zhengf5f18642014-07-04 13:59:43 +0800175 umode_t new_mode = inode->i_mode;
Christoph Hellwig75858232014-01-30 08:56:36 -0800176 int error;
Guangliang Zhao7221fe42013-11-11 15:18:03 +0800177
Yan, Zhengf5f18642014-07-04 13:59:43 +0800178 error = posix_acl_create(dir, &new_mode, &default_acl, &acl);
Christoph Hellwig75858232014-01-30 08:56:36 -0800179 if (error)
180 return error;
Guangliang Zhao7221fe42013-11-11 15:18:03 +0800181
Yan, Zhengf5f18642014-07-04 13:59:43 +0800182 if (!default_acl && !acl) {
Guangliang Zhao7221fe42013-11-11 15:18:03 +0800183 cache_no_acl(inode);
Yan, Zhengf5f18642014-07-04 13:59:43 +0800184 if (new_mode != inode->i_mode) {
185 struct iattr newattrs = {
186 .ia_mode = new_mode,
187 .ia_valid = ATTR_MODE,
188 };
189 error = ceph_setattr(dentry, &newattrs);
190 }
191 return error;
192 }
Guangliang Zhao7221fe42013-11-11 15:18:03 +0800193
Christoph Hellwig75858232014-01-30 08:56:36 -0800194 if (default_acl) {
195 error = ceph_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
196 posix_acl_release(default_acl);
197 }
198 if (acl) {
199 if (!error)
200 error = ceph_set_acl(inode, acl, ACL_TYPE_ACCESS);
201 posix_acl_release(acl);
202 }
203 return error;
Guangliang Zhao7221fe42013-11-11 15:18:03 +0800204}