340 lines
6.9 KiB
C
340 lines
6.9 KiB
C
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/*
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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 int acl_get(struct gfs2_inode *ip, const char *name,
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struct posix_acl **acl, struct gfs2_ea_location *el,
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char **datap, unsigned int *lenp)
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{
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char *data;
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unsigned int len;
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int error;
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el->el_bh = NULL;
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if (!ip->i_eattr)
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return 0;
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error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, el);
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if (error)
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return error;
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if (!el->el_ea)
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return 0;
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if (!GFS2_EA_DATA_LEN(el->el_ea))
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goto out;
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len = GFS2_EA_DATA_LEN(el->el_ea);
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data = kmalloc(len, GFP_NOFS);
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error = -ENOMEM;
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if (!data)
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goto out;
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error = gfs2_ea_get_copy(ip, el, data, len);
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if (error < 0)
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goto out_kfree;
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error = 0;
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if (acl) {
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*acl = posix_acl_from_xattr(data, len);
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if (IS_ERR(*acl))
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error = PTR_ERR(*acl);
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}
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out_kfree:
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if (error || !datap) {
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kfree(data);
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} else {
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*datap = data;
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*lenp = len;
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}
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out:
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return error;
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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 gfs2_ea_location el;
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struct posix_acl *acl = NULL;
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int error;
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error = acl_get(GFS2_I(inode), GFS2_POSIX_ACL_ACCESS, &acl, &el, NULL, NULL);
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brelse(el.el_bh);
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if (error)
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return error;
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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 munge_mode(struct gfs2_inode *ip, mode_t mode)
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{
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struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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struct buffer_head *dibh;
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int error;
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error = gfs2_trans_begin(sdp, RES_DINODE, 0);
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if (error)
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return error;
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error = gfs2_meta_inode_buffer(ip, &dibh);
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if (!error) {
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gfs2_assert_withdraw(sdp,
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(ip->i_inode.i_mode & S_IFMT) == (mode & S_IFMT));
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ip->i_inode.i_mode = mode;
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gfs2_trans_add_bh(ip->i_gl, dibh, 1);
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gfs2_dinode_out(ip, dibh->b_data);
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brelse(dibh);
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}
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gfs2_trans_end(sdp);
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return 0;
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}
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int gfs2_acl_create(struct gfs2_inode *dip, struct gfs2_inode *ip)
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{
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struct gfs2_ea_location el;
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struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
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struct posix_acl *acl = NULL, *clone;
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mode_t mode = ip->i_inode.i_mode;
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char *data = NULL;
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unsigned int len;
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int error;
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if (!sdp->sd_args.ar_posix_acl)
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return 0;
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if (S_ISLNK(ip->i_inode.i_mode))
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return 0;
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error = acl_get(dip, GFS2_POSIX_ACL_DEFAULT, &acl, &el, &data, &len);
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brelse(el.el_bh);
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if (error)
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return error;
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if (!acl) {
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mode &= ~current_umask();
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if (mode != ip->i_inode.i_mode)
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error = munge_mode(ip, mode);
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return error;
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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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if (S_ISDIR(ip->i_inode.i_mode)) {
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error = gfs2_xattr_set(&ip->i_inode, GFS2_EATYPE_SYS,
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GFS2_POSIX_ACL_DEFAULT, data, len, 0);
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if (error)
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goto out;
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}
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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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posix_acl_to_xattr(acl, data, len);
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error = gfs2_xattr_set(&ip->i_inode, GFS2_EATYPE_SYS,
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GFS2_POSIX_ACL_ACCESS, data, len, 0);
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if (error)
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goto out;
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munge:
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error = munge_mode(ip, mode);
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out:
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posix_acl_release(acl);
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kfree(data);
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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 = NULL, *clone;
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struct gfs2_ea_location el;
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char *data;
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unsigned int len;
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int error;
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error = acl_get(ip, GFS2_POSIX_ACL_ACCESS, &acl, &el, &data, &len);
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if (error)
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goto out_brelse;
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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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posix_acl_to_xattr(acl, data, len);
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error = gfs2_ea_acl_chmod(ip, &el, attr, data);
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}
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out:
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posix_acl_release(acl);
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kfree(data);
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out_brelse:
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brelse(el.el_bh);
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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_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_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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