[mirror_ubuntu-jammy-kernel.git] / fs / ceph / acl.c

/*
 * linux/fs/ceph/acl.c
 *
 * Copyright (C) 2013 Guangliang Zhao, <lucienchao@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <linux/ceph/ceph_debug.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/xattr.h>
#include <linux/posix_acl_xattr.h>
#include <linux/posix_acl.h>
#include <linux/sched.h>
#include <linux/slab.h>

#include "super.h"

static inline void ceph_set_cached_acl(struct inode *inode,
					int type, struct posix_acl *acl)
{
	struct ceph_inode_info *ci = ceph_inode(inode);

	spin_lock(&ci->i_ceph_lock);
	if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0))
		set_cached_acl(inode, type, acl);
	else
		forget_cached_acl(inode, type);
	spin_unlock(&ci->i_ceph_lock);
}

struct posix_acl *ceph_get_acl(struct inode *inode, int type)
{
	int size;
	unsigned int retry_cnt = 0;
	const char *name;
	char *value = NULL;
	struct posix_acl *acl;

	switch (type) {
	case ACL_TYPE_ACCESS:
		name = XATTR_NAME_POSIX_ACL_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		name = XATTR_NAME_POSIX_ACL_DEFAULT;
		break;
	default:
		BUG();
	}

retry:
	size = __ceph_getxattr(inode, name, "", 0);
	if (size > 0) {
		value = kzalloc(size, GFP_NOFS);
		if (!value)
			return ERR_PTR(-ENOMEM);
		size = __ceph_getxattr(inode, name, value, size);
	}

	if (size == -ERANGE && retry_cnt < 10) {
		retry_cnt++;
		kfree(value);
		value = NULL;
		goto retry;
	}

	if (size > 0) {
		acl = posix_acl_from_xattr(&init_user_ns, value, size);
	} else if (size == -ENODATA || size == 0) {
		acl = NULL;
	} else {
		pr_err_ratelimited("get acl %llx.%llx failed, err=%d\n",
				   ceph_vinop(inode), size);
		acl = ERR_PTR(-EIO);
	}

	kfree(value);

	if (!IS_ERR(acl))
		ceph_set_cached_acl(inode, type, acl);

	return acl;
}

int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
	int ret = 0, size = 0;
	const char *name = NULL;
	char *value = NULL;
	struct iattr newattrs;
	umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;

	switch (type) {
	case ACL_TYPE_ACCESS:
		name = XATTR_NAME_POSIX_ACL_ACCESS;
		if (acl) {
			ret = posix_acl_update_mode(inode, &new_mode, &acl);
			if (ret)
				goto out;
		}
		break;
	case ACL_TYPE_DEFAULT:
		if (!S_ISDIR(inode->i_mode)) {
			ret = acl ? -EINVAL : 0;
			goto out;
		}
		name = XATTR_NAME_POSIX_ACL_DEFAULT;
		break;
	default:
		ret = -EINVAL;
		goto out;
	}

	if (acl) {
		size = posix_acl_xattr_size(acl->a_count);
		value = kmalloc(size, GFP_NOFS);
		if (!value) {
			ret = -ENOMEM;
			goto out;
		}

		ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
		if (ret < 0)
			goto out_free;
	}

	if (ceph_snap(inode) != CEPH_NOSNAP) {
		ret = -EROFS;
		goto out_free;
	}

	if (new_mode != old_mode) {
		newattrs.ia_ctime = current_time(inode);
		newattrs.ia_mode = new_mode;
		newattrs.ia_valid = ATTR_MODE;
		ret = __ceph_setattr(inode, &newattrs);
		if (ret)
			goto out_free;
	}

	ret = __ceph_setxattr(inode, name, value, size, 0);
	if (ret) {
		if (new_mode != old_mode) {
			newattrs.ia_mode = old_mode;
			newattrs.ia_valid = ATTR_MODE;
			__ceph_setattr(inode, &newattrs);
		}
		goto out_free;
	}

	ceph_set_cached_acl(inode, type, acl);

out_free:
	kfree(value);
out:
	return ret;
}

int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
		       struct ceph_acls_info *info)
{
	struct posix_acl *acl, *default_acl;
	size_t val_size1 = 0, val_size2 = 0;
	struct ceph_pagelist *pagelist = NULL;
	void *tmp_buf = NULL;
	int err;

	err = posix_acl_create(dir, mode, &default_acl, &acl);
	if (err)
		return err;

	if (acl) {
		int ret = posix_acl_equiv_mode(acl, mode);
		if (ret < 0)
			goto out_err;
		if (ret == 0) {
			posix_acl_release(acl);
			acl = NULL;
		}
	}

	if (!default_acl && !acl)
		return 0;

	if (acl)
		val_size1 = posix_acl_xattr_size(acl->a_count);
	if (default_acl)
		val_size2 = posix_acl_xattr_size(default_acl->a_count);

	err = -ENOMEM;
	tmp_buf = kmalloc(max(val_size1, val_size2), GFP_KERNEL);
	if (!tmp_buf)
		goto out_err;
	pagelist = kmalloc(sizeof(struct ceph_pagelist), GFP_KERNEL);
	if (!pagelist)
		goto out_err;
	ceph_pagelist_init(pagelist);

	err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
	if (err)
		goto out_err;

	ceph_pagelist_encode_32(pagelist, acl && default_acl ? 2 : 1);

	if (acl) {
		size_t len = strlen(XATTR_NAME_POSIX_ACL_ACCESS);
		err = ceph_pagelist_reserve(pagelist, len + val_size1 + 8);
		if (err)
			goto out_err;
		ceph_pagelist_encode_string(pagelist, XATTR_NAME_POSIX_ACL_ACCESS,
					    len);
		err = posix_acl_to_xattr(&init_user_ns, acl,
					 tmp_buf, val_size1);
		if (err < 0)
			goto out_err;
		ceph_pagelist_encode_32(pagelist, val_size1);
		ceph_pagelist_append(pagelist, tmp_buf, val_size1);
	}
	if (default_acl) {
		size_t len = strlen(XATTR_NAME_POSIX_ACL_DEFAULT);
		err = ceph_pagelist_reserve(pagelist, len + val_size2 + 8);
		if (err)
			goto out_err;
		err = ceph_pagelist_encode_string(pagelist,
						  XATTR_NAME_POSIX_ACL_DEFAULT, len);
		err = posix_acl_to_xattr(&init_user_ns, default_acl,
					 tmp_buf, val_size2);
		if (err < 0)
			goto out_err;
		ceph_pagelist_encode_32(pagelist, val_size2);
		ceph_pagelist_append(pagelist, tmp_buf, val_size2);
	}

	kfree(tmp_buf);

	info->acl = acl;
	info->default_acl = default_acl;
	info->pagelist = pagelist;
	return 0;

out_err:
	posix_acl_release(acl);
	posix_acl_release(default_acl);
	kfree(tmp_buf);
	if (pagelist)
		ceph_pagelist_release(pagelist);
	return err;
}

void ceph_init_inode_acls(struct inode* inode, struct ceph_acls_info *info)
{
	if (!inode)
		return;
	ceph_set_cached_acl(inode, ACL_TYPE_ACCESS, info->acl);
	ceph_set_cached_acl(inode, ACL_TYPE_DEFAULT, info->default_acl);
}

void ceph_release_acls_info(struct ceph_acls_info *info)
{
	posix_acl_release(info->acl);
	posix_acl_release(info->default_acl);
	if (info->pagelist)
		ceph_pagelist_release(info->pagelist);
}
Commit	Line	Data
7221fe4c GZ	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
	32	static 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);
b8a7a3a6 AG	40	else
b8a7a3a6 AG	41	forget_cached_acl(inode, type);
7221fe4c GZ	42	spin_unlock(&ci->i_ceph_lock);
	43	}
	44
7221fe4c GZ	45	struct posix_acl ceph_get_acl(struct inode inode, int type)
	46	{
	47	int size;
f017754d	48	unsigned int retry_cnt = 0;
7221fe4c GZ	49	const char *name;
	50	char *value = NULL;
	51	struct posix_acl *acl;
	52
7221fe4c GZ	53	switch (type) {
7221fe4c GZ	54	case ACL_TYPE_ACCESS:
97d79299	55	name = XATTR_NAME_POSIX_ACL_ACCESS;
7221fe4c GZ	56	break;
7221fe4c GZ	57	case ACL_TYPE_DEFAULT:
97d79299	58	name = XATTR_NAME_POSIX_ACL_DEFAULT;
7221fe4c GZ	59	break;
	60	default:
	61	BUG();
	62	}
	63
f017754d	64	retry:
7221fe4c GZ	65	size = __ceph_getxattr(inode, name, "", 0);
	66	if (size > 0) {
	67	value = kzalloc(size, GFP_NOFS);
	68	if (!value)
	69	return ERR_PTR(-ENOMEM);
	70	size = __ceph_getxattr(inode, name, value, size);
	71	}
	72
f017754d CX	73	if (size == -ERANGE && retry_cnt < 10) {
	74	retry_cnt++;
	75	kfree(value);
	76	value = NULL;
	77	goto retry;
	78	}
	79
	80	if (size > 0) {
7221fe4c	81	acl = posix_acl_from_xattr(&init_user_ns, value, size);
f017754d	82	} else if (size == -ENODATA \|\| size == 0) {
7221fe4c	83	acl = NULL;
f017754d CX	84	} else {
	85	pr_err_ratelimited("get acl %llx.%llx failed, err=%d\n",
	86	ceph_vinop(inode), size);
7221fe4c	87	acl = ERR_PTR(-EIO);
f017754d	88	}
7221fe4c GZ	89
	90	kfree(value);
	91
	92	if (!IS_ERR(acl))
	93	ceph_set_cached_acl(inode, type, acl);
	94
	95	return acl;
	96	}
	97
72466d0b	98	int ceph_set_acl(struct inode inode, struct posix_acl acl, int type)
7221fe4c GZ	99	{
	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;
	105
7221fe4c GZ	106	switch (type) {
7221fe4c GZ	107	case ACL_TYPE_ACCESS:
97d79299	108	name = XATTR_NAME_POSIX_ACL_ACCESS;
7221fe4c	109	if (acl) {
07393101 JK	110	ret = posix_acl_update_mode(inode, &new_mode, &acl);
07393101 JK	111	if (ret)
7221fe4c	112	goto out;
7221fe4c GZ	113	}
	114	break;
	115	case ACL_TYPE_DEFAULT:
	116	if (!S_ISDIR(inode->i_mode)) {
	117	ret = acl ? -EINVAL : 0;
	118	goto out;
	119	}
97d79299	120	name = XATTR_NAME_POSIX_ACL_DEFAULT;
7221fe4c GZ	121	break;
	122	default:
	123	ret = -EINVAL;
	124	goto out;
	125	}
	126
	127	if (acl) {
	128	size = posix_acl_xattr_size(acl->a_count);
	129	value = kmalloc(size, GFP_NOFS);
	130	if (!value) {
	131	ret = -ENOMEM;
	132	goto out;
	133	}
	134
	135	ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
	136	if (ret < 0)
	137	goto out_free;
	138	}
	139
fd5472ed JK	140	if (ceph_snap(inode) != CEPH_NOSNAP) {
	141	ret = -EROFS;
	142	goto out_free;
	143	}
	144
7221fe4c	145	if (new_mode != old_mode) {
4ca2fea6	146	newattrs.ia_ctime = current_time(inode);
7221fe4c GZ	147	newattrs.ia_mode = new_mode;
7221fe4c GZ	148	newattrs.ia_valid = ATTR_MODE;
a26fecca	149	ret = __ceph_setattr(inode, &newattrs);
7221fe4c	150	if (ret)
a26fecca	151	goto out_free;
7221fe4c GZ	152	}
7221fe4c GZ	153
a26fecca	154	ret = __ceph_setxattr(inode, name, value, size, 0);
7221fe4c GZ	155	if (ret) {
	156	if (new_mode != old_mode) {
	157	newattrs.ia_mode = old_mode;
	158	newattrs.ia_valid = ATTR_MODE;
a26fecca	159	__ceph_setattr(inode, &newattrs);
7221fe4c	160	}
a26fecca	161	goto out_free;
7221fe4c GZ	162	}
	163
	164	ceph_set_cached_acl(inode, type, acl);
	165
	166	out_free:
	167	kfree(value);
	168	out:
	169	return ret;
	170	}
	171
b1ee94aa YZ	172	int ceph_pre_init_acls(struct inode dir, umode_t mode,
b1ee94aa YZ	173	struct ceph_acls_info *info)
7221fe4c	174	{
b1ee94aa YZ	175	struct posix_acl acl, default_acl;
	176	size_t val_size1 = 0, val_size2 = 0;
	177	struct ceph_pagelist *pagelist = NULL;
	178	void *tmp_buf = NULL;
	179	int err;
	180
	181	err = posix_acl_create(dir, mode, &default_acl, &acl);
	182	if (err)
	183	return err;
	184
	185	if (acl) {
	186	int ret = posix_acl_equiv_mode(acl, mode);
	187	if (ret < 0)
	188	goto out_err;
	189	if (ret == 0) {
	190	posix_acl_release(acl);
	191	acl = NULL;
f5f18647	192	}
f5f18647	193	}
7221fe4c	194
b1ee94aa YZ	195	if (!default_acl && !acl)
	196	return 0;
	197
	198	if (acl)
	199	val_size1 = posix_acl_xattr_size(acl->a_count);
	200	if (default_acl)
	201	val_size2 = posix_acl_xattr_size(default_acl->a_count);
	202
	203	err = -ENOMEM;
687265e5	204	tmp_buf = kmalloc(max(val_size1, val_size2), GFP_KERNEL);
b1ee94aa YZ	205	if (!tmp_buf)
b1ee94aa YZ	206	goto out_err;
687265e5	207	pagelist = kmalloc(sizeof(struct ceph_pagelist), GFP_KERNEL);
b1ee94aa YZ	208	if (!pagelist)
	209	goto out_err;
	210	ceph_pagelist_init(pagelist);
	211
	212	err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
	213	if (err)
	214	goto out_err;
	215
	216	ceph_pagelist_encode_32(pagelist, acl && default_acl ? 2 : 1);
	217
75858236	218	if (acl) {
97d79299	219	size_t len = strlen(XATTR_NAME_POSIX_ACL_ACCESS);
b1ee94aa YZ	220	err = ceph_pagelist_reserve(pagelist, len + val_size1 + 8);
	221	if (err)
	222	goto out_err;
97d79299	223	ceph_pagelist_encode_string(pagelist, XATTR_NAME_POSIX_ACL_ACCESS,
b1ee94aa YZ	224	len);
	225	err = posix_acl_to_xattr(&init_user_ns, acl,
	226	tmp_buf, val_size1);
	227	if (err < 0)
	228	goto out_err;
	229	ceph_pagelist_encode_32(pagelist, val_size1);
	230	ceph_pagelist_append(pagelist, tmp_buf, val_size1);
75858236	231	}
b1ee94aa	232	if (default_acl) {
97d79299	233	size_t len = strlen(XATTR_NAME_POSIX_ACL_DEFAULT);
b1ee94aa YZ	234	err = ceph_pagelist_reserve(pagelist, len + val_size2 + 8);
	235	if (err)
	236	goto out_err;
	237	err = ceph_pagelist_encode_string(pagelist,
97d79299	238	XATTR_NAME_POSIX_ACL_DEFAULT, len);
b1ee94aa YZ	239	err = posix_acl_to_xattr(&init_user_ns, default_acl,
	240	tmp_buf, val_size2);
	241	if (err < 0)
	242	goto out_err;
	243	ceph_pagelist_encode_32(pagelist, val_size2);
	244	ceph_pagelist_append(pagelist, tmp_buf, val_size2);
	245	}
	246
	247	kfree(tmp_buf);
	248
	249	info->acl = acl;
	250	info->default_acl = default_acl;
	251	info->pagelist = pagelist;
	252	return 0;
	253
	254	out_err:
	255	posix_acl_release(acl);
	256	posix_acl_release(default_acl);
	257	kfree(tmp_buf);
	258	if (pagelist)
	259	ceph_pagelist_release(pagelist);
	260	return err;
	261	}
	262
	263	void ceph_init_inode_acls(struct inode* inode, struct ceph_acls_info *info)
	264	{
	265	if (!inode)
	266	return;
	267	ceph_set_cached_acl(inode, ACL_TYPE_ACCESS, info->acl);
	268	ceph_set_cached_acl(inode, ACL_TYPE_DEFAULT, info->default_acl);
	269	}
	270
	271	void ceph_release_acls_info(struct ceph_acls_info *info)
	272	{
	273	posix_acl_release(info->acl);
	274	posix_acl_release(info->default_acl);
	275	if (info->pagelist)
	276	ceph_pagelist_release(info->pagelist);
7221fe4c	277	}