forked from luck/tmp_suning_uos_patched
1a39ba99b5
Switch to the generic xattr handlers and take the necessary glocks at
the layer below. The following are the new xattr "entry points"; they
are called with the glock held already in the following cases:
gfs2_xattr_get: From SELinux, during lookups.
gfs2_xattr_set: The glock is never held.
gfs2_get_acl: From gfs2_create_inode -> posix_acl_create and
gfs2_setattr -> posix_acl_chmod.
gfs2_set_acl: From gfs2_setattr -> posix_acl_chmod.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
154 lines
3.2 KiB
C
154 lines
3.2 KiB
C
/*
|
|
* 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>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/xattr.h>
|
|
#include <linux/posix_acl.h>
|
|
#include <linux/posix_acl_xattr.h>
|
|
#include <linux/gfs2_ondisk.h>
|
|
|
|
#include "gfs2.h"
|
|
#include "incore.h"
|
|
#include "acl.h"
|
|
#include "xattr.h"
|
|
#include "glock.h"
|
|
#include "inode.h"
|
|
#include "meta_io.h"
|
|
#include "rgrp.h"
|
|
#include "trans.h"
|
|
#include "util.h"
|
|
|
|
static const char *gfs2_acl_name(int type)
|
|
{
|
|
switch (type) {
|
|
case ACL_TYPE_ACCESS:
|
|
return XATTR_POSIX_ACL_ACCESS;
|
|
case ACL_TYPE_DEFAULT:
|
|
return XATTR_POSIX_ACL_DEFAULT;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct posix_acl *__gfs2_get_acl(struct inode *inode, int type)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct posix_acl *acl;
|
|
const char *name;
|
|
char *data;
|
|
int len;
|
|
|
|
if (!ip->i_eattr)
|
|
return NULL;
|
|
|
|
name = gfs2_acl_name(type);
|
|
len = gfs2_xattr_acl_get(ip, name, &data);
|
|
if (len <= 0)
|
|
return ERR_PTR(len);
|
|
acl = posix_acl_from_xattr(&init_user_ns, data, len);
|
|
kfree(data);
|
|
return acl;
|
|
}
|
|
|
|
struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_holder gh;
|
|
bool need_unlock = false;
|
|
struct posix_acl *acl;
|
|
|
|
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;
|
|
}
|
|
|
|
int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
|
|
{
|
|
int error;
|
|
int len;
|
|
char *data;
|
|
const char *name = gfs2_acl_name(type);
|
|
|
|
if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
|
|
return -E2BIG;
|
|
|
|
if (type == ACL_TYPE_ACCESS) {
|
|
umode_t mode = inode->i_mode;
|
|
|
|
error = posix_acl_equiv_mode(acl, &mode);
|
|
if (error < 0)
|
|
return error;
|
|
|
|
if (error == 0)
|
|
acl = NULL;
|
|
|
|
if (mode != inode->i_mode) {
|
|
inode->i_mode = mode;
|
|
mark_inode_dirty(inode);
|
|
}
|
|
}
|
|
|
|
if (acl) {
|
|
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;
|
|
} else {
|
|
data = NULL;
|
|
len = 0;
|
|
}
|
|
|
|
error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
|
|
if (error)
|
|
goto out;
|
|
set_cached_acl(inode, type, acl);
|
|
out:
|
|
kfree(data);
|
|
return error;
|
|
}
|
|
|
|
int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
|
|
{
|
|
struct gfs2_inode *ip = GFS2_I(inode);
|
|
struct gfs2_holder gh;
|
|
bool need_unlock = false;
|
|
int ret;
|
|
|
|
ret = gfs2_rsqa_alloc(ip);
|
|
if (ret)
|
|
return ret;
|
|
|
|
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)
|
|
return ret;
|
|
need_unlock = true;
|
|
}
|
|
ret = __gfs2_set_acl(inode, acl, type);
|
|
if (need_unlock)
|
|
gfs2_glock_dq_uninit(&gh);
|
|
return ret;
|
|
}
|