![Yan, Zheng](/assets/img/avatar_default.png)
when ACL is enabled, posix_acl_create() may change inode's mode Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
205 lines
4.5 KiB
C
205 lines
4.5 KiB
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);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
}
|
|
|
|
static inline struct posix_acl *ceph_get_cached_acl(struct inode *inode,
|
|
int type)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct posix_acl *acl = ACL_NOT_CACHED;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0))
|
|
acl = get_cached_acl(inode, type);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
return acl;
|
|
}
|
|
|
|
struct posix_acl *ceph_get_acl(struct inode *inode, int type)
|
|
{
|
|
int size;
|
|
const char *name;
|
|
char *value = NULL;
|
|
struct posix_acl *acl;
|
|
|
|
switch (type) {
|
|
case ACL_TYPE_ACCESS:
|
|
name = POSIX_ACL_XATTR_ACCESS;
|
|
break;
|
|
case ACL_TYPE_DEFAULT:
|
|
name = POSIX_ACL_XATTR_DEFAULT;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
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 > 0)
|
|
acl = posix_acl_from_xattr(&init_user_ns, value, size);
|
|
else if (size == -ERANGE || size == -ENODATA || size == 0)
|
|
acl = NULL;
|
|
else
|
|
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;
|
|
struct dentry *dentry;
|
|
|
|
switch (type) {
|
|
case ACL_TYPE_ACCESS:
|
|
name = POSIX_ACL_XATTR_ACCESS;
|
|
if (acl) {
|
|
ret = posix_acl_equiv_mode(acl, &new_mode);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret == 0)
|
|
acl = NULL;
|
|
}
|
|
break;
|
|
case ACL_TYPE_DEFAULT:
|
|
if (!S_ISDIR(inode->i_mode)) {
|
|
ret = acl ? -EINVAL : 0;
|
|
goto out;
|
|
}
|
|
name = POSIX_ACL_XATTR_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;
|
|
}
|
|
|
|
dentry = d_find_alias(inode);
|
|
if (new_mode != old_mode) {
|
|
newattrs.ia_mode = new_mode;
|
|
newattrs.ia_valid = ATTR_MODE;
|
|
ret = ceph_setattr(dentry, &newattrs);
|
|
if (ret)
|
|
goto out_dput;
|
|
}
|
|
|
|
ret = __ceph_setxattr(dentry, name, value, size, 0);
|
|
if (ret) {
|
|
if (new_mode != old_mode) {
|
|
newattrs.ia_mode = old_mode;
|
|
newattrs.ia_valid = ATTR_MODE;
|
|
ceph_setattr(dentry, &newattrs);
|
|
}
|
|
goto out_dput;
|
|
}
|
|
|
|
ceph_set_cached_acl(inode, type, acl);
|
|
|
|
out_dput:
|
|
dput(dentry);
|
|
out_free:
|
|
kfree(value);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int ceph_init_acl(struct dentry *dentry, struct inode *inode, struct inode *dir)
|
|
{
|
|
struct posix_acl *default_acl, *acl;
|
|
umode_t new_mode = inode->i_mode;
|
|
int error;
|
|
|
|
error = posix_acl_create(dir, &new_mode, &default_acl, &acl);
|
|
if (error)
|
|
return error;
|
|
|
|
if (!default_acl && !acl) {
|
|
cache_no_acl(inode);
|
|
if (new_mode != inode->i_mode) {
|
|
struct iattr newattrs = {
|
|
.ia_mode = new_mode,
|
|
.ia_valid = ATTR_MODE,
|
|
};
|
|
error = ceph_setattr(dentry, &newattrs);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
if (default_acl) {
|
|
error = ceph_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
|
|
posix_acl_release(default_acl);
|
|
}
|
|
if (acl) {
|
|
if (!error)
|
|
error = ceph_set_acl(inode, acl, ACL_TYPE_ACCESS);
|
|
posix_acl_release(acl);
|
|
}
|
|
return error;
|
|
}
|