318 lines
6.3 KiB
C
318 lines
6.3 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/xattr.h>
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#include <linux/posix_acl.h>
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#include <linux/posix_acl_xattr.h>
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#include <linux/gfs2_ondisk.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "acl.h"
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#include "xattr.h"
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#include "glock.h"
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#include "inode.h"
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#include "meta_io.h"
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#include "trans.h"
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#include "util.h"
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static const char *gfs2_acl_name(int type)
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{
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switch (type) {
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case ACL_TYPE_ACCESS:
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return GFS2_POSIX_ACL_ACCESS;
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case ACL_TYPE_DEFAULT:
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return GFS2_POSIX_ACL_DEFAULT;
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}
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return NULL;
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}
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static struct posix_acl *gfs2_acl_get(struct gfs2_inode *ip, int type)
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{
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struct posix_acl *acl;
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const char *name;
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char *data;
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int len;
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if (!ip->i_eattr)
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return NULL;
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name = gfs2_acl_name(type);
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if (name == NULL)
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return ERR_PTR(-EINVAL);
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len = gfs2_xattr_acl_get(ip, name, &data);
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if (len < 0)
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return ERR_PTR(len);
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if (len == 0)
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return NULL;
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acl = posix_acl_from_xattr(data, len);
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kfree(data);
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return acl;
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}
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/**
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* gfs2_check_acl - Check an ACL to see if we're allowed to do something
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* @inode: the file we want to do something to
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* @mask: what we want to do
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*
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* Returns: errno
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*/
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int gfs2_check_acl(struct inode *inode, int mask)
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{
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struct posix_acl *acl;
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int error;
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acl = gfs2_acl_get(GFS2_I(inode), ACL_TYPE_ACCESS);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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if (acl) {
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error = posix_acl_permission(inode, acl, mask);
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posix_acl_release(acl);
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return error;
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}
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return -EAGAIN;
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}
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static int gfs2_set_mode(struct inode *inode, mode_t mode)
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{
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int error = 0;
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if (mode != inode->i_mode) {
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struct iattr iattr;
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iattr.ia_valid = ATTR_MODE;
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iattr.ia_mode = mode;
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error = gfs2_setattr_simple(GFS2_I(inode), &iattr);
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}
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return error;
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}
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static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl)
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{
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int error;
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int len;
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char *data;
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const char *name = gfs2_acl_name(type);
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BUG_ON(name == NULL);
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len = posix_acl_to_xattr(acl, NULL, 0);
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if (len == 0)
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return 0;
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data = kmalloc(len, GFP_NOFS);
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if (data == NULL)
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return -ENOMEM;
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error = posix_acl_to_xattr(acl, data, len);
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if (error < 0)
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goto out;
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error = gfs2_xattr_set(inode, GFS2_EATYPE_SYS, name, data, len, 0);
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out:
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kfree(data);
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return error;
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}
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int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode)
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{
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struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
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struct posix_acl *acl, *clone;
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mode_t mode = inode->i_mode;
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int error = 0;
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if (!sdp->sd_args.ar_posix_acl)
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return 0;
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if (S_ISLNK(inode->i_mode))
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return 0;
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acl = gfs2_acl_get(dip, ACL_TYPE_DEFAULT);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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if (!acl) {
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mode &= ~current_umask();
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if (mode != inode->i_mode)
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error = gfs2_set_mode(inode, mode);
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return error;
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}
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if (S_ISDIR(inode->i_mode)) {
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error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl);
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if (error)
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goto out;
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}
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clone = posix_acl_clone(acl, GFP_NOFS);
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error = -ENOMEM;
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if (!clone)
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goto out;
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posix_acl_release(acl);
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acl = clone;
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error = posix_acl_create_masq(acl, &mode);
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if (error < 0)
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goto out;
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if (error == 0)
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goto munge;
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error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl);
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if (error)
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goto out;
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munge:
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error = gfs2_set_mode(inode, mode);
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out:
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posix_acl_release(acl);
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return error;
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}
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int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)
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{
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struct posix_acl *acl, *clone;
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char *data;
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unsigned int len;
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int error;
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acl = gfs2_acl_get(ip, ACL_TYPE_ACCESS);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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if (!acl)
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return gfs2_setattr_simple(ip, attr);
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clone = posix_acl_clone(acl, GFP_NOFS);
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error = -ENOMEM;
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if (!clone)
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goto out;
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posix_acl_release(acl);
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acl = clone;
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error = posix_acl_chmod_masq(acl, attr->ia_mode);
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if (!error) {
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len = posix_acl_to_xattr(acl, NULL, 0);
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data = kmalloc(len, GFP_NOFS);
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error = -ENOMEM;
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if (data == NULL)
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goto out;
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posix_acl_to_xattr(acl, data, len);
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error = gfs2_xattr_acl_chmod(ip, attr, data);
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kfree(data);
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}
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out:
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posix_acl_release(acl);
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return error;
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}
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static int gfs2_acl_type(const char *name)
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{
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if (strcmp(name, GFS2_POSIX_ACL_ACCESS) == 0)
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return ACL_TYPE_ACCESS;
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if (strcmp(name, GFS2_POSIX_ACL_DEFAULT) == 0)
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return ACL_TYPE_DEFAULT;
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return -EINVAL;
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}
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static int gfs2_xattr_system_get(struct inode *inode, const char *name,
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void *buffer, size_t size)
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{
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int type;
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type = gfs2_acl_type(name);
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if (type < 0)
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return type;
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return gfs2_xattr_get(inode, GFS2_EATYPE_SYS, name, buffer, size);
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}
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static int gfs2_xattr_system_set(struct inode *inode, const char *name,
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const void *value, size_t size, int flags)
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{
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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struct posix_acl *acl = NULL;
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int error = 0, type;
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if (!sdp->sd_args.ar_posix_acl)
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return -EOPNOTSUPP;
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type = gfs2_acl_type(name);
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if (type < 0)
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return type;
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if (flags & XATTR_CREATE)
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return -EINVAL;
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if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
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return value ? -EACCES : 0;
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if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER))
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return -EPERM;
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if (S_ISLNK(inode->i_mode))
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return -EOPNOTSUPP;
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if (!value)
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goto set_acl;
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acl = posix_acl_from_xattr(value, size);
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if (!acl) {
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/*
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* acl_set_file(3) may request that we set default ACLs with
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* zero length -- defend (gracefully) against that here.
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*/
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goto out;
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}
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if (IS_ERR(acl)) {
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error = PTR_ERR(acl);
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goto out;
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}
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error = posix_acl_valid(acl);
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if (error)
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goto out_release;
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error = -EINVAL;
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if (acl->a_count > GFS2_ACL_MAX_ENTRIES)
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goto out_release;
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if (type == ACL_TYPE_ACCESS) {
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mode_t mode = inode->i_mode;
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error = posix_acl_equiv_mode(acl, &mode);
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if (error <= 0) {
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posix_acl_release(acl);
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acl = NULL;
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if (error < 0)
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return error;
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}
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error = gfs2_set_mode(inode, mode);
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if (error)
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goto out_release;
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}
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set_acl:
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error = gfs2_xattr_set(inode, GFS2_EATYPE_SYS, name, value, size, 0);
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out_release:
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posix_acl_release(acl);
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out:
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return error;
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}
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struct xattr_handler gfs2_xattr_system_handler = {
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.prefix = XATTR_SYSTEM_PREFIX,
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.get = gfs2_xattr_system_get,
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.set = gfs2_xattr_system_set,
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};
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