[linux-2.6-block.git] / fs / ceph / acl.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * linux/fs/ceph/acl.c
 *
 * Copyright (C) 2013 Guangliang Zhao, <lucienchao@gmail.com>
 */

#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;
	struct timespec64 old_ctime = inode->i_ctime;
	umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;

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

	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 (new_mode != old_mode) {
		newattrs.ia_ctime = current_time(inode);
		newattrs.ia_mode = new_mode;
		newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
		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_ctime = old_ctime;
			newattrs.ia_mode = old_mode;
			newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
			__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_acl_sec_ctx *as_ctx)
{
	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) {
		err = posix_acl_equiv_mode(acl, mode);
		if (err < 0)
			goto out_err;
		if (err == 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 = ceph_pagelist_alloc(GFP_KERNEL);
	if (!pagelist)
		goto out_err;

	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);

	as_ctx->acl = acl;
	as_ctx->default_acl = default_acl;
	as_ctx->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_acl_sec_ctx *as_ctx)
{
	if (!inode)
		return;
	ceph_set_cached_acl(inode, ACL_TYPE_ACCESS, as_ctx->acl);
	ceph_set_cached_acl(inode, ACL_TYPE_DEFAULT, as_ctx->default_acl);
}
Commit	Line	Data
f2cde895	1	// SPDX-License-Identifier: GPL-2.0-only
7221fe4c GZ	2	/*
	3	* linux/fs/ceph/acl.c
	4	*
	5	* Copyright (C) 2013 Guangliang Zhao, <lucienchao@gmail.com>
7221fe4c GZ	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
	19	static inline void ceph_set_cached_acl(struct inode *inode,
	20	int type, struct posix_acl *acl)
	21	{
	22	struct ceph_inode_info *ci = ceph_inode(inode);
	23
	24	spin_lock(&ci->i_ceph_lock);
	25	if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0))
	26	set_cached_acl(inode, type, acl);
b8a7a3a6 AG	27	else
b8a7a3a6 AG	28	forget_cached_acl(inode, type);
7221fe4c GZ	29	spin_unlock(&ci->i_ceph_lock);
	30	}
	31
7221fe4c GZ	32	struct posix_acl ceph_get_acl(struct inode inode, int type)
	33	{
	34	int size;
f017754d	35	unsigned int retry_cnt = 0;
7221fe4c GZ	36	const char *name;
	37	char *value = NULL;
	38	struct posix_acl *acl;
	39
7221fe4c GZ	40	switch (type) {
7221fe4c GZ	41	case ACL_TYPE_ACCESS:
97d79299	42	name = XATTR_NAME_POSIX_ACL_ACCESS;
7221fe4c GZ	43	break;
7221fe4c GZ	44	case ACL_TYPE_DEFAULT:
97d79299	45	name = XATTR_NAME_POSIX_ACL_DEFAULT;
7221fe4c GZ	46	break;
	47	default:
	48	BUG();
	49	}
	50
f017754d	51	retry:
7221fe4c GZ	52	size = __ceph_getxattr(inode, name, "", 0);
	53	if (size > 0) {
	54	value = kzalloc(size, GFP_NOFS);
	55	if (!value)
	56	return ERR_PTR(-ENOMEM);
	57	size = __ceph_getxattr(inode, name, value, size);
	58	}
	59
f017754d CX	60	if (size == -ERANGE && retry_cnt < 10) {
	61	retry_cnt++;
	62	kfree(value);
	63	value = NULL;
	64	goto retry;
	65	}
	66
	67	if (size > 0) {
7221fe4c	68	acl = posix_acl_from_xattr(&init_user_ns, value, size);
f017754d	69	} else if (size == -ENODATA \|\| size == 0) {
7221fe4c	70	acl = NULL;
f017754d CX	71	} else {
	72	pr_err_ratelimited("get acl %llx.%llx failed, err=%d\n",
	73	ceph_vinop(inode), size);
7221fe4c	74	acl = ERR_PTR(-EIO);
f017754d	75	}
7221fe4c GZ	76
	77	kfree(value);
	78
	79	if (!IS_ERR(acl))
	80	ceph_set_cached_acl(inode, type, acl);
	81
	82	return acl;
	83	}
	84
72466d0b	85	int ceph_set_acl(struct inode inode, struct posix_acl acl, int type)
7221fe4c GZ	86	{
	87	int ret = 0, size = 0;
	88	const char *name = NULL;
	89	char *value = NULL;
	90	struct iattr newattrs;
93d35c75	91	struct timespec64 old_ctime = inode->i_ctime;
7221fe4c GZ	92	umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;
7221fe4c GZ	93
5da20799 CX	94	if (ceph_snap(inode) != CEPH_NOSNAP) {
	95	ret = -EROFS;
	96	goto out;
	97	}
	98
7221fe4c GZ	99	switch (type) {
7221fe4c GZ	100	case ACL_TYPE_ACCESS:
97d79299	101	name = XATTR_NAME_POSIX_ACL_ACCESS;
7221fe4c	102	if (acl) {
07393101 JK	103	ret = posix_acl_update_mode(inode, &new_mode, &acl);
07393101 JK	104	if (ret)
7221fe4c	105	goto out;
7221fe4c GZ	106	}
	107	break;
	108	case ACL_TYPE_DEFAULT:
	109	if (!S_ISDIR(inode->i_mode)) {
	110	ret = acl ? -EINVAL : 0;
	111	goto out;
	112	}
97d79299	113	name = XATTR_NAME_POSIX_ACL_DEFAULT;
7221fe4c GZ	114	break;
	115	default:
	116	ret = -EINVAL;
	117	goto out;
	118	}
	119
	120	if (acl) {
	121	size = posix_acl_xattr_size(acl->a_count);
	122	value = kmalloc(size, GFP_NOFS);
	123	if (!value) {
	124	ret = -ENOMEM;
	125	goto out;
	126	}
	127
	128	ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
	129	if (ret < 0)
	130	goto out_free;
	131	}
	132
	133	if (new_mode != old_mode) {
4ca2fea6	134	newattrs.ia_ctime = current_time(inode);
7221fe4c	135	newattrs.ia_mode = new_mode;
93d35c75	136	newattrs.ia_valid = ATTR_MODE \| ATTR_CTIME;
a26fecca	137	ret = __ceph_setattr(inode, &newattrs);
7221fe4c	138	if (ret)
a26fecca	139	goto out_free;
7221fe4c GZ	140	}
7221fe4c GZ	141
a26fecca	142	ret = __ceph_setxattr(inode, name, value, size, 0);
7221fe4c GZ	143	if (ret) {
7221fe4c GZ	144	if (new_mode != old_mode) {
93d35c75	145	newattrs.ia_ctime = old_ctime;
7221fe4c	146	newattrs.ia_mode = old_mode;
93d35c75	147	newattrs.ia_valid = ATTR_MODE \| ATTR_CTIME;
a26fecca	148	__ceph_setattr(inode, &newattrs);
7221fe4c	149	}
a26fecca	150	goto out_free;
7221fe4c GZ	151	}
	152
	153	ceph_set_cached_acl(inode, type, acl);
	154
	155	out_free:
	156	kfree(value);
	157	out:
	158	return ret;
	159	}
	160
b1ee94aa	161	int ceph_pre_init_acls(struct inode dir, umode_t mode,
5c31e92d	162	struct ceph_acl_sec_ctx *as_ctx)
7221fe4c	163	{
b1ee94aa YZ	164	struct posix_acl acl, default_acl;
	165	size_t val_size1 = 0, val_size2 = 0;
	166	struct ceph_pagelist *pagelist = NULL;
	167	void *tmp_buf = NULL;
	168	int err;
	169
	170	err = posix_acl_create(dir, mode, &default_acl, &acl);
	171	if (err)
	172	return err;
	173
	174	if (acl) {
61ad36d4 CX	175	err = posix_acl_equiv_mode(acl, mode);
61ad36d4 CX	176	if (err < 0)
b1ee94aa	177	goto out_err;
61ad36d4	178	if (err == 0) {
b1ee94aa YZ	179	posix_acl_release(acl);
b1ee94aa YZ	180	acl = NULL;
f5f18647	181	}
f5f18647	182	}
7221fe4c	183
b1ee94aa YZ	184	if (!default_acl && !acl)
	185	return 0;
	186
	187	if (acl)
	188	val_size1 = posix_acl_xattr_size(acl->a_count);
	189	if (default_acl)
	190	val_size2 = posix_acl_xattr_size(default_acl->a_count);
	191
	192	err = -ENOMEM;
687265e5	193	tmp_buf = kmalloc(max(val_size1, val_size2), GFP_KERNEL);
b1ee94aa YZ	194	if (!tmp_buf)
b1ee94aa YZ	195	goto out_err;
33165d47	196	pagelist = ceph_pagelist_alloc(GFP_KERNEL);
b1ee94aa YZ	197	if (!pagelist)
b1ee94aa YZ	198	goto out_err;
b1ee94aa YZ	199
	200	err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
	201	if (err)
	202	goto out_err;
	203
	204	ceph_pagelist_encode_32(pagelist, acl && default_acl ? 2 : 1);
	205
75858236	206	if (acl) {
97d79299	207	size_t len = strlen(XATTR_NAME_POSIX_ACL_ACCESS);
b1ee94aa YZ	208	err = ceph_pagelist_reserve(pagelist, len + val_size1 + 8);
	209	if (err)
	210	goto out_err;
97d79299	211	ceph_pagelist_encode_string(pagelist, XATTR_NAME_POSIX_ACL_ACCESS,
b1ee94aa YZ	212	len);
	213	err = posix_acl_to_xattr(&init_user_ns, acl,
	214	tmp_buf, val_size1);
	215	if (err < 0)
	216	goto out_err;
	217	ceph_pagelist_encode_32(pagelist, val_size1);
	218	ceph_pagelist_append(pagelist, tmp_buf, val_size1);
75858236	219	}
b1ee94aa	220	if (default_acl) {
97d79299	221	size_t len = strlen(XATTR_NAME_POSIX_ACL_DEFAULT);
b1ee94aa YZ	222	err = ceph_pagelist_reserve(pagelist, len + val_size2 + 8);
	223	if (err)
	224	goto out_err;
	225	err = ceph_pagelist_encode_string(pagelist,
97d79299	226	XATTR_NAME_POSIX_ACL_DEFAULT, len);
b1ee94aa YZ	227	err = posix_acl_to_xattr(&init_user_ns, default_acl,
	228	tmp_buf, val_size2);
	229	if (err < 0)
	230	goto out_err;
	231	ceph_pagelist_encode_32(pagelist, val_size2);
	232	ceph_pagelist_append(pagelist, tmp_buf, val_size2);
	233	}
	234
	235	kfree(tmp_buf);
	236
5c31e92d YZ	237	as_ctx->acl = acl;
	238	as_ctx->default_acl = default_acl;
	239	as_ctx->pagelist = pagelist;
b1ee94aa YZ	240	return 0;
	241
	242	out_err:
	243	posix_acl_release(acl);
	244	posix_acl_release(default_acl);
	245	kfree(tmp_buf);
	246	if (pagelist)
	247	ceph_pagelist_release(pagelist);
	248	return err;
	249	}
	250
5c31e92d	251	void ceph_init_inode_acls(struct inode inode, struct ceph_acl_sec_ctx as_ctx)
b1ee94aa YZ	252	{
	253	if (!inode)
	254	return;
5c31e92d YZ	255	ceph_set_cached_acl(inode, ACL_TYPE_ACCESS, as_ctx->acl);
5c31e92d YZ	256	ceph_set_cached_acl(inode, ACL_TYPE_DEFAULT, as_ctx->default_acl);
7221fe4c	257	}