[people/ms/linux.git] / fs / ocfs2 / acl.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * acl.c
 *
 * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
 *
 * CREDITS:
 * Lots of code in this file is copy from linux/fs/ext3/acl.c.
 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>

#include <cluster/masklog.h>

#include "ocfs2.h"
#include "alloc.h"
#include "dlmglue.h"
#include "file.h"
#include "inode.h"
#include "journal.h"
#include "ocfs2_fs.h"

#include "xattr.h"
#include "acl.h"

/*
 * Convert from xattr value to acl struct.
 */
static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size)
{
	int n, count;
	struct posix_acl *acl;

	if (!value)
		return NULL;
	if (size < sizeof(struct posix_acl_entry))
		return ERR_PTR(-EINVAL);

	count = size / sizeof(struct posix_acl_entry);

	acl = posix_acl_alloc(count, GFP_NOFS);
	if (!acl)
		return ERR_PTR(-ENOMEM);
	for (n = 0; n < count; n++) {
		struct ocfs2_acl_entry *entry =
			(struct ocfs2_acl_entry *)value;

		acl->a_entries[n].e_tag  = le16_to_cpu(entry->e_tag);
		acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
		switch(acl->a_entries[n].e_tag) {
		case ACL_USER:
			acl->a_entries[n].e_uid =
				make_kuid(&init_user_ns,
					  le32_to_cpu(entry->e_id));
			break;
		case ACL_GROUP:
			acl->a_entries[n].e_gid =
				make_kgid(&init_user_ns,
					  le32_to_cpu(entry->e_id));
			break;
		default:
			break;
		}
		value += sizeof(struct posix_acl_entry);

	}
	return acl;
}

/*
 * Convert acl struct to xattr value.
 */
static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size)
{
	struct ocfs2_acl_entry *entry = NULL;
	char *ocfs2_acl;
	size_t n;

	*size = acl->a_count * sizeof(struct posix_acl_entry);

	ocfs2_acl = kmalloc(*size, GFP_NOFS);
	if (!ocfs2_acl)
		return ERR_PTR(-ENOMEM);

	entry = (struct ocfs2_acl_entry *)ocfs2_acl;
	for (n = 0; n < acl->a_count; n++, entry++) {
		entry->e_tag  = cpu_to_le16(acl->a_entries[n].e_tag);
		entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
		switch(acl->a_entries[n].e_tag) {
		case ACL_USER:
			entry->e_id = cpu_to_le32(
				from_kuid(&init_user_ns,
					  acl->a_entries[n].e_uid));
			break;
		case ACL_GROUP:
			entry->e_id = cpu_to_le32(
				from_kgid(&init_user_ns,
					  acl->a_entries[n].e_gid));
			break;
		default:
			entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
			break;
		}
	}
	return ocfs2_acl;
}

static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode,
					      int type,
					      struct buffer_head *di_bh)
{
	int name_index;
	char *value = NULL;
	struct posix_acl *acl;
	int retval;

	switch (type) {
	case ACL_TYPE_ACCESS:
		name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
		break;
	default:
		return ERR_PTR(-EINVAL);
	}

	retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0);
	if (retval > 0) {
		value = kmalloc(retval, GFP_NOFS);
		if (!value)
			return ERR_PTR(-ENOMEM);
		retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
						"", value, retval);
	}

	if (retval > 0)
		acl = ocfs2_acl_from_xattr(value, retval);
	else if (retval == -ENODATA || retval == 0)
		acl = NULL;
	else
		acl = ERR_PTR(retval);

	kfree(value);

	return acl;
}

/*
 * Helper function to set i_mode in memory and disk. Some call paths
 * will not have di_bh or a journal handle to pass, in which case it
 * will create it's own.
 */
static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh,
			      handle_t *handle, umode_t new_mode)
{
	int ret, commit_handle = 0;
	struct ocfs2_dinode *di;

	if (di_bh == NULL) {
		ret = ocfs2_read_inode_block(inode, &di_bh);
		if (ret) {
			mlog_errno(ret);
			goto out;
		}
	} else
		get_bh(di_bh);

	if (handle == NULL) {
		handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
					   OCFS2_INODE_UPDATE_CREDITS);
		if (IS_ERR(handle)) {
			ret = PTR_ERR(handle);
			mlog_errno(ret);
			goto out_brelse;
		}

		commit_handle = 1;
	}

	di = (struct ocfs2_dinode *)di_bh->b_data;
	ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
				      OCFS2_JOURNAL_ACCESS_WRITE);
	if (ret) {
		mlog_errno(ret);
		goto out_commit;
	}

	inode->i_mode = new_mode;
	inode->i_ctime = current_time(inode);
	di->i_mode = cpu_to_le16(inode->i_mode);
	di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
	di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
	ocfs2_update_inode_fsync_trans(handle, inode, 0);

	ocfs2_journal_dirty(handle, di_bh);

out_commit:
	if (commit_handle)
		ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
out_brelse:
	brelse(di_bh);
out:
	return ret;
}

/*
 * Set the access or default ACL of an inode.
 */
static int ocfs2_set_acl(handle_t *handle,
			 struct inode *inode,
			 struct buffer_head *di_bh,
			 int type,
			 struct posix_acl *acl,
			 struct ocfs2_alloc_context *meta_ac,
			 struct ocfs2_alloc_context *data_ac)
{
	int name_index;
	void *value = NULL;
	size_t size = 0;
	int ret;

	if (S_ISLNK(inode->i_mode))
		return -EOPNOTSUPP;

	switch (type) {
	case ACL_TYPE_ACCESS:
		name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
		break;
	case ACL_TYPE_DEFAULT:
		name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
		if (!S_ISDIR(inode->i_mode))
			return acl ? -EACCES : 0;
		break;
	default:
		return -EINVAL;
	}

	if (acl) {
		value = ocfs2_acl_to_xattr(acl, &size);
		if (IS_ERR(value))
			return (int)PTR_ERR(value);
	}

	if (handle)
		ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
					     "", value, size, 0,
					     meta_ac, data_ac);
	else
		ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);

	kfree(value);
	if (!ret)
		set_cached_acl(inode, type, acl);

	return ret;
}

int ocfs2_iop_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
		      struct posix_acl *acl, int type)
{
	struct buffer_head *bh = NULL;
	int status, had_lock;
	struct ocfs2_lock_holder oh;

	had_lock = ocfs2_inode_lock_tracker(inode, &bh, 1, &oh);
	if (had_lock < 0)
		return had_lock;
	if (type == ACL_TYPE_ACCESS && acl) {
		umode_t mode;

		status = posix_acl_update_mode(&init_user_ns, inode, &mode,
					       &acl);
		if (status)
			goto unlock;

		status = ocfs2_acl_set_mode(inode, bh, NULL, mode);
		if (status)
			goto unlock;
	}
	status = ocfs2_set_acl(NULL, inode, bh, type, acl, NULL, NULL);
unlock:
	ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock);
	brelse(bh);
	return status;
}

struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type, bool rcu)
{
	struct ocfs2_super *osb;
	struct buffer_head *di_bh = NULL;
	struct posix_acl *acl;
	int had_lock;
	struct ocfs2_lock_holder oh;

	if (rcu)
		return ERR_PTR(-ECHILD);

	osb = OCFS2_SB(inode->i_sb);
	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
		return NULL;

	had_lock = ocfs2_inode_lock_tracker(inode, &di_bh, 0, &oh);
	if (had_lock < 0)
		return ERR_PTR(had_lock);

	down_read(&OCFS2_I(inode)->ip_xattr_sem);
	acl = ocfs2_get_acl_nolock(inode, type, di_bh);
	up_read(&OCFS2_I(inode)->ip_xattr_sem);

	ocfs2_inode_unlock_tracker(inode, 0, &oh, had_lock);
	brelse(di_bh);
	return acl;
}

int ocfs2_acl_chmod(struct inode *inode, struct buffer_head *bh)
{
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct posix_acl *acl;
	int ret;

	if (S_ISLNK(inode->i_mode))
		return -EOPNOTSUPP;

	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
		return 0;

	down_read(&OCFS2_I(inode)->ip_xattr_sem);
	acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, bh);
	up_read(&OCFS2_I(inode)->ip_xattr_sem);
	if (IS_ERR_OR_NULL(acl))
		return PTR_ERR_OR_ZERO(acl);
	ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
	if (ret)
		return ret;
	ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
			    acl, NULL, NULL);
	posix_acl_release(acl);
	return ret;
}

/*
 * Initialize the ACLs of a new inode. If parent directory has default ACL,
 * then clone to new inode. Called from ocfs2_mknod.
 */
int ocfs2_init_acl(handle_t *handle,
		   struct inode *inode,
		   struct inode *dir,
		   struct buffer_head *di_bh,
		   struct buffer_head *dir_bh,
		   struct ocfs2_alloc_context *meta_ac,
		   struct ocfs2_alloc_context *data_ac)
{
	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	struct posix_acl *acl = NULL;
	int ret = 0, ret2;
	umode_t mode;

	if (!S_ISLNK(inode->i_mode)) {
		if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
			down_read(&OCFS2_I(dir)->ip_xattr_sem);
			acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
						   dir_bh);
			up_read(&OCFS2_I(dir)->ip_xattr_sem);
			if (IS_ERR(acl))
				return PTR_ERR(acl);
		}
		if (!acl) {
			mode = inode->i_mode & ~current_umask();
			ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
			if (ret) {
				mlog_errno(ret);
				goto cleanup;
			}
		}
	}
	if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
		if (S_ISDIR(inode->i_mode)) {
			ret = ocfs2_set_acl(handle, inode, di_bh,
					    ACL_TYPE_DEFAULT, acl,
					    meta_ac, data_ac);
			if (ret)
				goto cleanup;
		}
		mode = inode->i_mode;
		ret = __posix_acl_create(&acl, GFP_NOFS, &mode);
		if (ret < 0)
			return ret;

		ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
		if (ret2) {
			mlog_errno(ret2);
			ret = ret2;
			goto cleanup;
		}
		if (ret > 0) {
			ret = ocfs2_set_acl(handle, inode,
					    di_bh, ACL_TYPE_ACCESS,
					    acl, meta_ac, data_ac);
		}
	}
cleanup:
	posix_acl_release(acl);
	return ret;
}
Commit	Line	Data
1802d0be	1	// SPDX-License-Identifier: GPL-2.0-only
fa60ce2c	2	/*
929fb014 TY	3	* acl.c
	4	*
	5	* Copyright (C) 2004, 2008 Oracle. All rights reserved.
	6	*
	7	* CREDITS:
	8	* Lots of code in this file is copy from linux/fs/ext3/acl.c.
	9	* Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
929fb014 TY	10	*/
	11
	12	#include <linux/init.h>
	13	#include <linux/module.h>
5a0e3ad6	14	#include <linux/slab.h>
929fb014 TY	15	#include <linux/string.h>
929fb014 TY	16
929fb014 TY	17	#include <cluster/masklog.h>
	18
	19	#include "ocfs2.h"
	20	#include "alloc.h"
	21	#include "dlmglue.h"
	22	#include "file.h"
fcefd25a MF	23	#include "inode.h"
fcefd25a MF	24	#include "journal.h"
929fb014 TY	25	#include "ocfs2_fs.h"
	26
	27	#include "xattr.h"
	28	#include "acl.h"
	29
	30	/*
	31	* Convert from xattr value to acl struct.
	32	*/
	33	static struct posix_acl ocfs2_acl_from_xattr(const void value, size_t size)
	34	{
	35	int n, count;
	36	struct posix_acl *acl;
	37
	38	if (!value)
	39	return NULL;
	40	if (size < sizeof(struct posix_acl_entry))
	41	return ERR_PTR(-EINVAL);
	42
	43	count = size / sizeof(struct posix_acl_entry);
929fb014 TY	44
	45	acl = posix_acl_alloc(count, GFP_NOFS);
	46	if (!acl)
	47	return ERR_PTR(-ENOMEM);
	48	for (n = 0; n < count; n++) {
	49	struct ocfs2_acl_entry *entry =
	50	(struct ocfs2_acl_entry *)value;
	51
	52	acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
	53	acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
9522751c EB	54	switch(acl->a_entries[n].e_tag) {
	55	case ACL_USER:
	56	acl->a_entries[n].e_uid =
	57	make_kuid(&init_user_ns,
	58	le32_to_cpu(entry->e_id));
	59	break;
	60	case ACL_GROUP:
	61	acl->a_entries[n].e_gid =
	62	make_kgid(&init_user_ns,
	63	le32_to_cpu(entry->e_id));
	64	break;
	65	default:
	66	break;
	67	}
929fb014 TY	68	value += sizeof(struct posix_acl_entry);
	69
	70	}
	71	return acl;
	72	}
	73
	74	/*
	75	* Convert acl struct to xattr value.
	76	*/
	77	static void ocfs2_acl_to_xattr(const struct posix_acl acl, size_t *size)
	78	{
	79	struct ocfs2_acl_entry *entry = NULL;
	80	char *ocfs2_acl;
	81	size_t n;
	82
	83	size = acl->a_count sizeof(struct posix_acl_entry);
	84
	85	ocfs2_acl = kmalloc(*size, GFP_NOFS);
	86	if (!ocfs2_acl)
	87	return ERR_PTR(-ENOMEM);
	88
	89	entry = (struct ocfs2_acl_entry *)ocfs2_acl;
	90	for (n = 0; n < acl->a_count; n++, entry++) {
	91	entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
	92	entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
9522751c EB	93	switch(acl->a_entries[n].e_tag) {
	94	case ACL_USER:
	95	entry->e_id = cpu_to_le32(
	96	from_kuid(&init_user_ns,
	97	acl->a_entries[n].e_uid));
	98	break;
	99	case ACL_GROUP:
	100	entry->e_id = cpu_to_le32(
	101	from_kgid(&init_user_ns,
	102	acl->a_entries[n].e_gid));
	103	break;
	104	default:
	105	entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
	106	break;
	107	}
929fb014 TY	108	}
	109	return ocfs2_acl;
	110	}
	111
	112	static struct posix_acl ocfs2_get_acl_nolock(struct inode inode,
	113	int type,
	114	struct buffer_head *di_bh)
	115	{
929fb014 TY	116	int name_index;
	117	char *value = NULL;
	118	struct posix_acl *acl;
	119	int retval;
	120
929fb014 TY	121	switch (type) {
	122	case ACL_TYPE_ACCESS:
	123	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
	124	break;
	125	case ACL_TYPE_DEFAULT:
	126	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
	127	break;
	128	default:
	129	return ERR_PTR(-EINVAL);
	130	}
	131
	132	retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0);
	133	if (retval > 0) {
	134	value = kmalloc(retval, GFP_NOFS);
	135	if (!value)
	136	return ERR_PTR(-ENOMEM);
	137	retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
	138	"", value, retval);
	139	}
	140
	141	if (retval > 0)
	142	acl = ocfs2_acl_from_xattr(value, retval);
	143	else if (retval == -ENODATA \|\| retval == 0)
	144	acl = NULL;
	145	else
	146	acl = ERR_PTR(retval);
	147
	148	kfree(value);
	149
	150	return acl;
	151	}
	152
fcefd25a MF	153	/*
	154	* Helper function to set i_mode in memory and disk. Some call paths
	155	* will not have di_bh or a journal handle to pass, in which case it
	156	* will create it's own.
	157	*/
	158	static int ocfs2_acl_set_mode(struct inode inode, struct buffer_head di_bh,
	159	handle_t *handle, umode_t new_mode)
	160	{
	161	int ret, commit_handle = 0;
	162	struct ocfs2_dinode *di;
	163
	164	if (di_bh == NULL) {
	165	ret = ocfs2_read_inode_block(inode, &di_bh);
	166	if (ret) {
	167	mlog_errno(ret);
	168	goto out;
	169	}
	170	} else
	171	get_bh(di_bh);
	172
	173	if (handle == NULL) {
	174	handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
	175	OCFS2_INODE_UPDATE_CREDITS);
	176	if (IS_ERR(handle)) {
	177	ret = PTR_ERR(handle);
	178	mlog_errno(ret);
	179	goto out_brelse;
	180	}
	181
	182	commit_handle = 1;
	183	}
	184
	185	di = (struct ocfs2_dinode *)di_bh->b_data;
	186	ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
	187	OCFS2_JOURNAL_ACCESS_WRITE);
	188	if (ret) {
	189	mlog_errno(ret);
	190	goto out_commit;
	191	}
	192
	193	inode->i_mode = new_mode;
078cd827	194	inode->i_ctime = current_time(inode);
fcefd25a	195	di->i_mode = cpu_to_le16(inode->i_mode);
12828061 TM	196	di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
12828061 TM	197	di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
6fdb702d	198	ocfs2_update_inode_fsync_trans(handle, inode, 0);
fcefd25a MF	199
	200	ocfs2_journal_dirty(handle, di_bh);
	201
	202	out_commit:
	203	if (commit_handle)
	204	ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
	205	out_brelse:
	206	brelse(di_bh);
	207	out:
	208	return ret;
	209	}
	210
929fb014 TY	211	/*
	212	* Set the access or default ACL of an inode.
	213	*/
01ffb56b	214	static int ocfs2_set_acl(handle_t *handle,
929fb014 TY	215	struct inode *inode,
	216	struct buffer_head *di_bh,
	217	int type,
	218	struct posix_acl *acl,
	219	struct ocfs2_alloc_context *meta_ac,
	220	struct ocfs2_alloc_context *data_ac)
	221	{
	222	int name_index;
	223	void *value = NULL;
	224	size_t size = 0;
	225	int ret;
	226
	227	if (S_ISLNK(inode->i_mode))
	228	return -EOPNOTSUPP;
	229
	230	switch (type) {
	231	case ACL_TYPE_ACCESS:
	232	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
929fb014 TY	233	break;
	234	case ACL_TYPE_DEFAULT:
	235	name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
	236	if (!S_ISDIR(inode->i_mode))
	237	return acl ? -EACCES : 0;
	238	break;
	239	default:
	240	return -EINVAL;
	241	}
	242
	243	if (acl) {
	244	value = ocfs2_acl_to_xattr(acl, &size);
	245	if (IS_ERR(value))
	246	return (int)PTR_ERR(value);
	247	}
	248
	249	if (handle)
	250	ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
	251	"", value, size, 0,
	252	meta_ac, data_ac);
	253	else
	254	ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
	255
	256	kfree(value);
504ec37d GH	257	if (!ret)
504ec37d GH	258	set_cached_acl(inode, type, acl);
929fb014 TY	259
	260	return ret;
	261	}
	262
549c7297 CB	263	int ocfs2_iop_set_acl(struct user_namespace mnt_userns, struct inode inode,
549c7297 CB	264	struct posix_acl *acl, int type)
702e5bc6	265	{
743b5f14	266	struct buffer_head *bh = NULL;
b891fa50 ER	267	int status, had_lock;
b891fa50 ER	268	struct ocfs2_lock_holder oh;
743b5f14	269
b891fa50 ER	270	had_lock = ocfs2_inode_lock_tracker(inode, &bh, 1, &oh);
	271	if (had_lock < 0)
	272	return had_lock;
19ec8e48 JK	273	if (type == ACL_TYPE_ACCESS && acl) {
	274	umode_t mode;
	275
e65ce2a5 CB	276	status = posix_acl_update_mode(&init_user_ns, inode, &mode,
e65ce2a5 CB	277	&acl);
19ec8e48 JK	278	if (status)
	279	goto unlock;
	280
	281	status = ocfs2_acl_set_mode(inode, bh, NULL, mode);
	282	if (status)
	283	goto unlock;
	284	}
743b5f14	285	status = ocfs2_set_acl(NULL, inode, bh, type, acl, NULL, NULL);
19ec8e48	286	unlock:
b891fa50	287	ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock);
743b5f14 TS	288	brelse(bh);
743b5f14 TS	289	return status;
702e5bc6 CH	290	}
702e5bc6 CH	291
0cad6246	292	struct posix_acl ocfs2_iop_get_acl(struct inode inode, int type, bool rcu)
23fc2702	293	{
b74c79e9	294	struct ocfs2_super *osb;
845b6cf3 JZ	295	struct buffer_head *di_bh = NULL;
845b6cf3 JZ	296	struct posix_acl *acl;
b891fa50 ER	297	int had_lock;
b891fa50 ER	298	struct ocfs2_lock_holder oh;
845b6cf3	299
0cad6246 MS	300	if (rcu)
	301	return ERR_PTR(-ECHILD);
	302
b74c79e9	303	osb = OCFS2_SB(inode->i_sb);
845b6cf3	304	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
4e34e719	305	return NULL;
b891fa50 ER	306
	307	had_lock = ocfs2_inode_lock_tracker(inode, &di_bh, 0, &oh);
	308	if (had_lock < 0)
	309	return ERR_PTR(had_lock);
845b6cf3	310
16c8d569	311	down_read(&OCFS2_I(inode)->ip_xattr_sem);
4e34e719	312	acl = ocfs2_get_acl_nolock(inode, type, di_bh);
16c8d569	313	up_read(&OCFS2_I(inode)->ip_xattr_sem);
845b6cf3	314
b891fa50	315	ocfs2_inode_unlock_tracker(inode, 0, &oh, had_lock);
845b6cf3	316	brelse(di_bh);
4e34e719	317	return acl;
23fc2702	318	}
5ee0fbd5 JB	319
	320	int ocfs2_acl_chmod(struct inode inode, struct buffer_head bh)
	321	{
	322	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	323	struct posix_acl *acl;
	324	int ret;
	325
	326	if (S_ISLNK(inode->i_mode))
	327	return -EOPNOTSUPP;
	328
	329	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
	330	return 0;
	331
16c8d569	332	down_read(&OCFS2_I(inode)->ip_xattr_sem);
5ee0fbd5	333	acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, bh);
16c8d569	334	up_read(&OCFS2_I(inode)->ip_xattr_sem);
188c523e DX	335	if (IS_ERR_OR_NULL(acl))
188c523e DX	336	return PTR_ERR_OR_ZERO(acl);
5ee0fbd5 JB	337	ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
	338	if (ret)
	339	return ret;
	340	ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
	341	acl, NULL, NULL);
	342	posix_acl_release(acl);
	343	return ret;
	344	}
c25a1e06 JB	345
	346	/*
	347	* Initialize the ACLs of a new inode. If parent directory has default ACL,
	348	* then clone to new inode. Called from ocfs2_mknod.
	349	*/
	350	int ocfs2_init_acl(handle_t *handle,
	351	struct inode *inode,
	352	struct inode *dir,
	353	struct buffer_head *di_bh,
	354	struct buffer_head *dir_bh,
	355	struct ocfs2_alloc_context *meta_ac,
	356	struct ocfs2_alloc_context *data_ac)
	357	{
	358	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
	359	struct posix_acl *acl = NULL;
	360	int ret = 0, ret2;
	361	umode_t mode;
	362
	363	if (!S_ISLNK(inode->i_mode)) {
	364	if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
16c8d569	365	down_read(&OCFS2_I(dir)->ip_xattr_sem);
c25a1e06 JB	366	acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
c25a1e06 JB	367	dir_bh);
16c8d569	368	up_read(&OCFS2_I(dir)->ip_xattr_sem);
c25a1e06 JB	369	if (IS_ERR(acl))
	370	return PTR_ERR(acl);
	371	}
	372	if (!acl) {
	373	mode = inode->i_mode & ~current_umask();
	374	ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
	375	if (ret) {
	376	mlog_errno(ret);
	377	goto cleanup;
	378	}
	379	}
	380	}
	381	if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
	382	if (S_ISDIR(inode->i_mode)) {
	383	ret = ocfs2_set_acl(handle, inode, di_bh,
	384	ACL_TYPE_DEFAULT, acl,
	385	meta_ac, data_ac);
	386	if (ret)
	387	goto cleanup;
	388	}
	389	mode = inode->i_mode;
	390	ret = __posix_acl_create(&acl, GFP_NOFS, &mode);
	391	if (ret < 0)
	392	return ret;
	393
	394	ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
	395	if (ret2) {
	396	mlog_errno(ret2);
	397	ret = ret2;
	398	goto cleanup;
	399	}
	400	if (ret > 0) {
	401	ret = ocfs2_set_acl(handle, inode,
	402	di_bh, ACL_TYPE_ACCESS,
	403	acl, meta_ac, data_ac);
	404	}
	405	}
	406	cleanup:
	407	posix_acl_release(acl);
	408	return ret;
	409	}