1 files changed, 72 insertions, 223 deletions

diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c
index f69ac0af5496..443640e6fb9c 100644
--- a/fs/gfs2/acl.c
+++ b/fs/gfs2/acl.c
@@ -1,10 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
- *
- * This copyrighted material is made available to anyone wishing to use,
- * modify, copy, or redistribute it subject to the terms and conditions
- * of the GNU General Public License version 2.
  */
 
 #include <linux/sched.h>
@@ -24,6 +21,8 @@
 #include "glock.h"
 #include "inode.h"
 #include "meta_io.h"
+#include "quota.h"
+#include "rgrp.h"
 #include "trans.h"
 #include "util.h"
 
@@ -31,14 +30,14 @@ static const char *gfs2_acl_name(int type)
 {
 	switch (type) {
 	case ACL_TYPE_ACCESS:
-		return GFS2_POSIX_ACL_ACCESS;
+		return XATTR_POSIX_ACL_ACCESS;
 	case ACL_TYPE_DEFAULT:
-		return GFS2_POSIX_ACL_DEFAULT;
+		return XATTR_POSIX_ACL_DEFAULT;
 	}
 	return NULL;
 }
 
-struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
+static struct posix_acl *__gfs2_get_acl(struct inode *inode, int type)
 {
 	struct gfs2_inode *ip = GFS2_I(inode);
 	struct posix_acl *acl;
@@ -49,258 +48,108 @@ struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
 	if (!ip->i_eattr)
 		return NULL;
 
-	acl = get_cached_acl(&ip->i_inode, type);
-	if (acl != ACL_NOT_CACHED)
-		return acl;
-
 	name = gfs2_acl_name(type);
-	if (name == NULL)
-		return ERR_PTR(-EINVAL);
-
 	len = gfs2_xattr_acl_get(ip, name, &data);
-	if (len < 0)
+	if (len <= 0)
 		return ERR_PTR(len);
-	if (len == 0)
-		return NULL;
-
 	acl = posix_acl_from_xattr(&init_user_ns, data, len);
 	kfree(data);
 	return acl;
 }
 
-static int gfs2_set_mode(struct inode *inode, umode_t mode)
+struct posix_acl *gfs2_get_acl(struct inode *inode, int type, bool rcu)
 {
-	int error = 0;
+	struct gfs2_inode *ip = GFS2_I(inode);
+	struct gfs2_holder gh;
+	bool need_unlock = false;
+	struct posix_acl *acl;
 
-	if (mode != inode->i_mode) {
-		inode->i_mode = mode;
-		mark_inode_dirty(inode);
-	}
+	if (rcu)
+		return ERR_PTR(-ECHILD);
 
-	return error;
+	if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
+		int ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
+					     LM_FLAG_ANY, &gh);
+		if (ret)
+			return ERR_PTR(ret);
+		need_unlock = true;
+	}
+	acl = __gfs2_get_acl(inode, type);
+	if (need_unlock)
+		gfs2_glock_dq_uninit(&gh);
+	return acl;
 }
 
-static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl)
+int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 {
 	int error;
-	int len;
+	size_t len;
 	char *data;
 	const char *name = gfs2_acl_name(type);
 
-	BUG_ON(name == NULL);
-	len = posix_acl_to_xattr(&init_user_ns, acl, NULL, 0);
-	if (len == 0)
-		return 0;
-	data = kmalloc(len, GFP_NOFS);
-	if (data == NULL)
-		return -ENOMEM;
-	error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
-	if (error < 0)
-		goto out;
-	error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
-	if (!error)
-		set_cached_acl(inode, type, acl);
-out:
-	kfree(data);
-	return error;
-}
-
-int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode)
-{
-	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
-	struct posix_acl *acl;
-	umode_t mode = inode->i_mode;
-	int error = 0;
-
-	if (!sdp->sd_args.ar_posix_acl)
-		return 0;
-	if (S_ISLNK(inode->i_mode))
-		return 0;
-
-	acl = gfs2_get_acl(&dip->i_inode, ACL_TYPE_DEFAULT);
-	if (IS_ERR(acl))
-		return PTR_ERR(acl);
-	if (!acl) {
-		mode &= ~current_umask();
-		return gfs2_set_mode(inode, mode);
-	}
-
-	if (S_ISDIR(inode->i_mode)) {
-		error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl);
-		if (error)
+	if (acl) {
+		len = posix_acl_xattr_size(acl->a_count);
+		data = kmalloc(len, GFP_NOFS);
+		if (data == NULL)
+			return -ENOMEM;
+		error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
+		if (error < 0)
 			goto out;
+	} else {
+		data = NULL;
+		len = 0;
 	}
 
-	error = posix_acl_create(&acl, GFP_NOFS, &mode);
-	if (error < 0)
-		return error;
-
-	if (error == 0)
-		goto munge;
-
-	error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl);
+	error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
 	if (error)
 		goto out;
-munge:
-	error = gfs2_set_mode(inode, mode);
+	set_cached_acl(inode, type, acl);
 out:
-	posix_acl_release(acl);
-	return error;
-}
-
-int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)
-{
-	struct inode *inode = &ip->i_inode;
-	struct posix_acl *acl;
-	char *data;
-	unsigned int len;
-	int error;
-
-	acl = gfs2_get_acl(&ip->i_inode, ACL_TYPE_ACCESS);
-	if (IS_ERR(acl))
-		return PTR_ERR(acl);
-	if (!acl)
-		return gfs2_setattr_simple(inode, attr);
-
-	error = posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode);
-	if (error)
-		return error;
-
-	len = posix_acl_to_xattr(&init_user_ns, acl, NULL, 0);
-	data = kmalloc(len, GFP_NOFS);
-	error = -ENOMEM;
-	if (data == NULL)
-		goto out;
-	posix_acl_to_xattr(&init_user_ns, acl, data, len);
-	error = gfs2_xattr_acl_chmod(ip, attr, data);
 	kfree(data);
-	set_cached_acl(&ip->i_inode, ACL_TYPE_ACCESS, acl);
-
-out:
-	posix_acl_release(acl);
 	return error;
 }
 
-static int gfs2_acl_type(const char *name)
+int gfs2_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
+		 struct posix_acl *acl, int type)
 {
-	if (strcmp(name, GFS2_POSIX_ACL_ACCESS) == 0)
-		return ACL_TYPE_ACCESS;
-	if (strcmp(name, GFS2_POSIX_ACL_DEFAULT) == 0)
-		return ACL_TYPE_DEFAULT;
-	return -EINVAL;
-}
-
-static int gfs2_xattr_system_get(struct dentry *dentry, const char *name,
-				 void *buffer, size_t size, int xtype)
-{
-	struct inode *inode = dentry->d_inode;
-	struct gfs2_sbd *sdp = GFS2_SB(inode);
-	struct posix_acl *acl;
-	int type;
-	int error;
-
-	if (!sdp->sd_args.ar_posix_acl)
-		return -EOPNOTSUPP;
-
-	type = gfs2_acl_type(name);
-	if (type < 0)
-		return type;
-
-	acl = gfs2_get_acl(inode, type);
-	if (IS_ERR(acl))
-		return PTR_ERR(acl);
-	if (acl == NULL)
-		return -ENODATA;
-
-	error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
-	posix_acl_release(acl);
-
-	return error;
-}
-
-static int gfs2_xattr_system_set(struct dentry *dentry, const char *name,
-				 const void *value, size_t size, int flags,
-				 int xtype)
-{
-	struct inode *inode = dentry->d_inode;
-	struct gfs2_sbd *sdp = GFS2_SB(inode);
-	struct posix_acl *acl = NULL;
-	int error = 0, type;
-
-	if (!sdp->sd_args.ar_posix_acl)
-		return -EOPNOTSUPP;
+	struct inode *inode = d_inode(dentry);
+	struct gfs2_inode *ip = GFS2_I(inode);
+	struct gfs2_holder gh;
+	bool need_unlock = false;
+	int ret;
+	umode_t mode;
 
-	type = gfs2_acl_type(name);
-	if (type < 0)
-		return type;
-	if (flags & XATTR_CREATE)
-		return -EINVAL;
-	if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
-		return value ? -EACCES : 0;
-	if (!uid_eq(current_fsuid(), inode->i_uid) && !capable(CAP_FOWNER))
-		return -EPERM;
-	if (S_ISLNK(inode->i_mode))
-		return -EOPNOTSUPP;
+	if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
+		return -E2BIG;
 
-	if (!value)
-		goto set_acl;
+	ret = gfs2_qa_get(ip);
+	if (ret)
+		return ret;
 
-	acl = posix_acl_from_xattr(&init_user_ns, value, size);
-	if (!acl) {
-		/*
-		 * acl_set_file(3) may request that we set default ACLs with
-		 * zero length -- defend (gracefully) against that here.
-		 */
-		goto out;
-	}
-	if (IS_ERR(acl)) {
-		error = PTR_ERR(acl);
-		goto out;
+	if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
+		ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
+		if (ret)
+			goto out;
+		need_unlock = true;
 	}
 
-	error = posix_acl_valid(acl);
-	if (error)
-		goto out_release;
-
-	error = -EINVAL;
-	if (acl->a_count > GFS2_ACL_MAX_ENTRIES)
-		goto out_release;
-
-	if (type == ACL_TYPE_ACCESS) {
-		umode_t mode = inode->i_mode;
-		error = posix_acl_equiv_mode(acl, &mode);
-
-		if (error <= 0) {
-			posix_acl_release(acl);
-			acl = NULL;
-
-			if (error < 0)
-				return error;
-		}
-
-		error = gfs2_set_mode(inode, mode);
-		if (error)
-			goto out_release;
+	mode = inode->i_mode;
+	if (type == ACL_TYPE_ACCESS && acl) {
+		ret = posix_acl_update_mode(&nop_mnt_idmap, inode, &mode, &acl);
+		if (ret)
+			goto unlock;
 	}
 
-set_acl:
-	error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS);
-	if (!error) {
-		if (acl)
-			set_cached_acl(inode, type, acl);
-		else
-			forget_cached_acl(inode, type);
+	ret = __gfs2_set_acl(inode, acl, type);
+	if (!ret && mode != inode->i_mode) {
+		inode_set_ctime_current(inode);
+		inode->i_mode = mode;
+		mark_inode_dirty(inode);
 	}
-out_release:
-	posix_acl_release(acl);
+unlock:
+	if (need_unlock)
+		gfs2_glock_dq_uninit(&gh);
 out:
-	return error;
+	gfs2_qa_put(ip);
+	return ret;
 }
-
-const struct xattr_handler gfs2_xattr_system_handler = {
-	.prefix = XATTR_SYSTEM_PREFIX,
-	.flags  = GFS2_EATYPE_SYS,
-	.get    = gfs2_xattr_system_get,
-	.set    = gfs2_xattr_system_set,
-};
-