1/*
  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
 43struct posix_acl *ceph_get_acl(struct inode *inode, int type)
 44{
 
 45	int size;
 
 46	const char *name;
 47	char *value = NULL;
 48	struct posix_acl *acl;
 49
 
 
 
 50	switch (type) {
 51	case ACL_TYPE_ACCESS:
 52		name = XATTR_NAME_POSIX_ACL_ACCESS;
 53		break;
 54	case ACL_TYPE_DEFAULT:
 55		name = XATTR_NAME_POSIX_ACL_DEFAULT;
 56		break;
 57	default:
 58		BUG();
 59	}
 60
 
 61	size = __ceph_getxattr(inode, name, "", 0);
 62	if (size > 0) {
 63		value = kzalloc(size, GFP_NOFS);
 64		if (!value)
 65			return ERR_PTR(-ENOMEM);
 66		size = __ceph_getxattr(inode, name, value, size);
 67	}
 68
 69	if (size > 0)
 
 
 
 
 
 
 
 70		acl = posix_acl_from_xattr(&init_user_ns, value, size);
 71	else if (size == -ERANGE || size == -ENODATA || size == 0)
 72		acl = NULL;
 73	else
 
 
 74		acl = ERR_PTR(-EIO);
 
 75
 76	kfree(value);
 77
 78	if (!IS_ERR(acl))
 79		ceph_set_cached_acl(inode, type, acl);
 80
 81	return acl;
 82}
 83
 84int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 
 85{
 86	int ret = 0, size = 0;
 87	const char *name = NULL;
 88	char *value = NULL;
 89	struct iattr newattrs;
 
 
 90	umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;
 91	struct dentry *dentry;
 
 
 
 
 92
 93	switch (type) {
 94	case ACL_TYPE_ACCESS:
 95		name = XATTR_NAME_POSIX_ACL_ACCESS;
 96		if (acl) {
 97			ret = posix_acl_equiv_mode(acl, &new_mode);
 98			if (ret < 0)
 
 99				goto out;
100			if (ret == 0)
101				acl = NULL;
102		}
103		break;
104	case ACL_TYPE_DEFAULT:
105		if (!S_ISDIR(inode->i_mode)) {
106			ret = acl ? -EINVAL : 0;
107			goto out;
108		}
109		name = XATTR_NAME_POSIX_ACL_DEFAULT;
110		break;
111	default:
112		ret = -EINVAL;
113		goto out;
114	}
115
116	if (acl) {
117		size = posix_acl_xattr_size(acl->a_count);
118		value = kmalloc(size, GFP_NOFS);
119		if (!value) {
120			ret = -ENOMEM;
121			goto out;
122		}
123
124		ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
125		if (ret < 0)
126			goto out_free;
127	}
128
129	dentry = d_find_alias(inode);
130	if (new_mode != old_mode) {
 
131		newattrs.ia_mode = new_mode;
132		newattrs.ia_valid = ATTR_MODE;
133		ret = ceph_setattr(dentry, &newattrs);
134		if (ret)
135			goto out_dput;
136	}
137
138	ret = __ceph_setxattr(dentry, name, value, size, 0);
139	if (ret) {
140		if (new_mode != old_mode) {
 
141			newattrs.ia_mode = old_mode;
142			newattrs.ia_valid = ATTR_MODE;
143			ceph_setattr(dentry, &newattrs);
144		}
145		goto out_dput;
146	}
147
148	ceph_set_cached_acl(inode, type, acl);
149
150out_dput:
151	dput(dentry);
152out_free:
153	kfree(value);
154out:
155	return ret;
156}
157
158int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
159		       struct ceph_acls_info *info)
160{
161	struct posix_acl *acl, *default_acl;
162	size_t val_size1 = 0, val_size2 = 0;
163	struct ceph_pagelist *pagelist = NULL;
164	void *tmp_buf = NULL;
165	int err;
166
167	err = posix_acl_create(dir, mode, &default_acl, &acl);
168	if (err)
169		return err;
170
171	if (acl) {
172		int ret = posix_acl_equiv_mode(acl, mode);
173		if (ret < 0)
174			goto out_err;
175		if (ret == 0) {
176			posix_acl_release(acl);
177			acl = NULL;
178		}
179	}
180
181	if (!default_acl && !acl)
182		return 0;
183
184	if (acl)
185		val_size1 = posix_acl_xattr_size(acl->a_count);
186	if (default_acl)
187		val_size2 = posix_acl_xattr_size(default_acl->a_count);
188
189	err = -ENOMEM;
190	tmp_buf = kmalloc(max(val_size1, val_size2), GFP_KERNEL);
191	if (!tmp_buf)
192		goto out_err;
193	pagelist = kmalloc(sizeof(struct ceph_pagelist), GFP_KERNEL);
194	if (!pagelist)
195		goto out_err;
196	ceph_pagelist_init(pagelist);
197
198	err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
199	if (err)
200		goto out_err;
201
202	ceph_pagelist_encode_32(pagelist, acl && default_acl ? 2 : 1);
203
204	if (acl) {
205		size_t len = strlen(XATTR_NAME_POSIX_ACL_ACCESS);
206		err = ceph_pagelist_reserve(pagelist, len + val_size1 + 8);
207		if (err)
208			goto out_err;
209		ceph_pagelist_encode_string(pagelist, XATTR_NAME_POSIX_ACL_ACCESS,
210					    len);
211		err = posix_acl_to_xattr(&init_user_ns, acl,
212					 tmp_buf, val_size1);
213		if (err < 0)
214			goto out_err;
215		ceph_pagelist_encode_32(pagelist, val_size1);
216		ceph_pagelist_append(pagelist, tmp_buf, val_size1);
217	}
218	if (default_acl) {
219		size_t len = strlen(XATTR_NAME_POSIX_ACL_DEFAULT);
220		err = ceph_pagelist_reserve(pagelist, len + val_size2 + 8);
221		if (err)
222			goto out_err;
223		err = ceph_pagelist_encode_string(pagelist,
224						  XATTR_NAME_POSIX_ACL_DEFAULT, len);
225		err = posix_acl_to_xattr(&init_user_ns, default_acl,
226					 tmp_buf, val_size2);
227		if (err < 0)
228			goto out_err;
229		ceph_pagelist_encode_32(pagelist, val_size2);
230		ceph_pagelist_append(pagelist, tmp_buf, val_size2);
231	}
232
233	kfree(tmp_buf);
234
235	info->acl = acl;
236	info->default_acl = default_acl;
237	info->pagelist = pagelist;
238	return 0;
239
240out_err:
241	posix_acl_release(acl);
242	posix_acl_release(default_acl);
243	kfree(tmp_buf);
244	if (pagelist)
245		ceph_pagelist_release(pagelist);
246	return err;
247}
248
249void ceph_init_inode_acls(struct inode* inode, struct ceph_acls_info *info)
250{
251	if (!inode)
252		return;
253	ceph_set_cached_acl(inode, ACL_TYPE_ACCESS, info->acl);
254	ceph_set_cached_acl(inode, ACL_TYPE_DEFAULT, info->default_acl);
255}
256
257void ceph_release_acls_info(struct ceph_acls_info *info)
258{
259	posix_acl_release(info->acl);
260	posix_acl_release(info->default_acl);
261	if (info->pagelist)
262		ceph_pagelist_release(info->pagelist);
263}

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * linux/fs/ceph/acl.c
  4 *
  5 * Copyright (C) 2013 Guangliang Zhao, <lucienchao@gmail.com>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  6 */
  7
  8#include <linux/ceph/ceph_debug.h>
  9#include <linux/fs.h>
 10#include <linux/string.h>
 11#include <linux/xattr.h>
 12#include <linux/posix_acl_xattr.h>
 13#include <linux/posix_acl.h>
 14#include <linux/sched.h>
 15#include <linux/slab.h>
 16
 17#include "super.h"
 18#include "mds_client.h"
 19
 20static inline void ceph_set_cached_acl(struct inode *inode,
 21					int type, struct posix_acl *acl)
 22{
 23	struct ceph_inode_info *ci = ceph_inode(inode);
 24
 25	spin_lock(&ci->i_ceph_lock);
 26	if (__ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 0))
 27		set_cached_acl(inode, type, acl);
 28	else
 29		forget_cached_acl(inode, type);
 30	spin_unlock(&ci->i_ceph_lock);
 31}
 32
 33struct posix_acl *ceph_get_acl(struct inode *inode, int type, bool rcu)
 34{
 35	struct ceph_client *cl = ceph_inode_to_client(inode);
 36	int size;
 37	unsigned int retry_cnt = 0;
 38	const char *name;
 39	char *value = NULL;
 40	struct posix_acl *acl;
 41
 42	if (rcu)
 43		return ERR_PTR(-ECHILD);
 44
 45	switch (type) {
 46	case ACL_TYPE_ACCESS:
 47		name = XATTR_NAME_POSIX_ACL_ACCESS;
 48		break;
 49	case ACL_TYPE_DEFAULT:
 50		name = XATTR_NAME_POSIX_ACL_DEFAULT;
 51		break;
 52	default:
 53		BUG();
 54	}
 55
 56retry:
 57	size = __ceph_getxattr(inode, name, "", 0);
 58	if (size > 0) {
 59		value = kzalloc(size, GFP_NOFS);
 60		if (!value)
 61			return ERR_PTR(-ENOMEM);
 62		size = __ceph_getxattr(inode, name, value, size);
 63	}
 64
 65	if (size == -ERANGE && retry_cnt < 10) {
 66		retry_cnt++;
 67		kfree(value);
 68		value = NULL;
 69		goto retry;
 70	}
 71
 72	if (size > 0) {
 73		acl = posix_acl_from_xattr(&init_user_ns, value, size);
 74	} else if (size == -ENODATA || size == 0) {
 75		acl = NULL;
 76	} else {
 77		pr_err_ratelimited_client(cl, "%llx.%llx failed, err=%d\n",
 78					  ceph_vinop(inode), size);
 79		acl = ERR_PTR(-EIO);
 80	}
 81
 82	kfree(value);
 83
 84	if (!IS_ERR(acl))
 85		ceph_set_cached_acl(inode, type, acl);
 86
 87	return acl;
 88}
 89
 90int ceph_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
 91		 struct posix_acl *acl, int type)
 92{
 93	int ret = 0, size = 0;
 94	const char *name = NULL;
 95	char *value = NULL;
 96	struct iattr newattrs;
 97	struct inode *inode = d_inode(dentry);
 98	struct timespec64 old_ctime = inode_get_ctime(inode);
 99	umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;
100
101	if (ceph_snap(inode) != CEPH_NOSNAP) {
102		ret = -EROFS;
103		goto out;
104	}
105
106	switch (type) {
107	case ACL_TYPE_ACCESS:
108		name = XATTR_NAME_POSIX_ACL_ACCESS;
109		if (acl) {
110			ret = posix_acl_update_mode(idmap, inode,
111						    &new_mode, &acl);
112			if (ret)
113				goto out;
 
 
114		}
115		break;
116	case ACL_TYPE_DEFAULT:
117		if (!S_ISDIR(inode->i_mode)) {
118			ret = acl ? -EINVAL : 0;
119			goto out;
120		}
121		name = XATTR_NAME_POSIX_ACL_DEFAULT;
122		break;
123	default:
124		ret = -EINVAL;
125		goto out;
126	}
127
128	if (acl) {
129		size = posix_acl_xattr_size(acl->a_count);
130		value = kmalloc(size, GFP_NOFS);
131		if (!value) {
132			ret = -ENOMEM;
133			goto out;
134		}
135
136		ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
137		if (ret < 0)
138			goto out_free;
139	}
140
 
141	if (new_mode != old_mode) {
142		newattrs.ia_ctime = current_time(inode);
143		newattrs.ia_mode = new_mode;
144		newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
145		ret = __ceph_setattr(idmap, inode, &newattrs, NULL);
146		if (ret)
147			goto out_free;
148	}
149
150	ret = __ceph_setxattr(inode, name, value, size, 0);
151	if (ret) {
152		if (new_mode != old_mode) {
153			newattrs.ia_ctime = old_ctime;
154			newattrs.ia_mode = old_mode;
155			newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
156			__ceph_setattr(idmap, inode, &newattrs, NULL);
157		}
158		goto out_free;
159	}
160
161	ceph_set_cached_acl(inode, type, acl);
162
 
 
163out_free:
164	kfree(value);
165out:
166	return ret;
167}
168
169int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
170		       struct ceph_acl_sec_ctx *as_ctx)
171{
172	struct posix_acl *acl, *default_acl;
173	size_t val_size1 = 0, val_size2 = 0;
174	struct ceph_pagelist *pagelist = NULL;
175	void *tmp_buf = NULL;
176	int err;
177
178	err = posix_acl_create(dir, mode, &default_acl, &acl);
179	if (err)
180		return err;
181
182	if (acl) {
183		err = posix_acl_equiv_mode(acl, mode);
184		if (err < 0)
185			goto out_err;
186		if (err == 0) {
187			posix_acl_release(acl);
188			acl = NULL;
189		}
190	}
191
192	if (!default_acl && !acl)
193		return 0;
194
195	if (acl)
196		val_size1 = posix_acl_xattr_size(acl->a_count);
197	if (default_acl)
198		val_size2 = posix_acl_xattr_size(default_acl->a_count);
199
200	err = -ENOMEM;
201	tmp_buf = kmalloc(max(val_size1, val_size2), GFP_KERNEL);
202	if (!tmp_buf)
203		goto out_err;
204	pagelist = ceph_pagelist_alloc(GFP_KERNEL);
205	if (!pagelist)
206		goto out_err;
 
207
208	err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
209	if (err)
210		goto out_err;
211
212	ceph_pagelist_encode_32(pagelist, acl && default_acl ? 2 : 1);
213
214	if (acl) {
215		size_t len = strlen(XATTR_NAME_POSIX_ACL_ACCESS);
216		err = ceph_pagelist_reserve(pagelist, len + val_size1 + 8);
217		if (err)
218			goto out_err;
219		ceph_pagelist_encode_string(pagelist, XATTR_NAME_POSIX_ACL_ACCESS,
220					    len);
221		err = posix_acl_to_xattr(&init_user_ns, acl,
222					 tmp_buf, val_size1);
223		if (err < 0)
224			goto out_err;
225		ceph_pagelist_encode_32(pagelist, val_size1);
226		ceph_pagelist_append(pagelist, tmp_buf, val_size1);
227	}
228	if (default_acl) {
229		size_t len = strlen(XATTR_NAME_POSIX_ACL_DEFAULT);
230		err = ceph_pagelist_reserve(pagelist, len + val_size2 + 8);
231		if (err)
232			goto out_err;
233		ceph_pagelist_encode_string(pagelist,
234					  XATTR_NAME_POSIX_ACL_DEFAULT, len);
235		err = posix_acl_to_xattr(&init_user_ns, default_acl,
236					 tmp_buf, val_size2);
237		if (err < 0)
238			goto out_err;
239		ceph_pagelist_encode_32(pagelist, val_size2);
240		ceph_pagelist_append(pagelist, tmp_buf, val_size2);
241	}
242
243	kfree(tmp_buf);
244
245	as_ctx->acl = acl;
246	as_ctx->default_acl = default_acl;
247	as_ctx->pagelist = pagelist;
248	return 0;
249
250out_err:
251	posix_acl_release(acl);
252	posix_acl_release(default_acl);
253	kfree(tmp_buf);
254	if (pagelist)
255		ceph_pagelist_release(pagelist);
256	return err;
257}
258
259void ceph_init_inode_acls(struct inode *inode, struct ceph_acl_sec_ctx *as_ctx)
260{
261	if (!inode)
262		return;
263	ceph_set_cached_acl(inode, ACL_TYPE_ACCESS, as_ctx->acl);
264	ceph_set_cached_acl(inode, ACL_TYPE_DEFAULT, as_ctx->default_acl);
 
 
 
 
 
 
 
 
265}