310 lines
6.4 KiB
C
310 lines
6.4 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/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 "lm_interface.h"
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#include "incore.h"
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#include "acl.h"
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#include "eaops.h"
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#include "eattr.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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#define ACL_ACCESS 1
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#define ACL_DEFAULT 0
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int gfs2_acl_validate_set(struct gfs2_inode *ip, int access,
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struct gfs2_ea_request *er,
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int *remove, mode_t *mode)
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{
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struct posix_acl *acl;
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int error;
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error = gfs2_acl_validate_remove(ip, access);
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if (error)
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return error;
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if (!er->er_data)
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return -EINVAL;
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acl = posix_acl_from_xattr(er->er_data, er->er_data_len);
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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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*remove = 1;
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return 0;
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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;
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if (access) {
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error = posix_acl_equiv_mode(acl, mode);
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if (!error)
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*remove = 1;
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else if (error > 0)
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error = 0;
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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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int gfs2_acl_validate_remove(struct gfs2_inode *ip, int access)
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{
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if (!GFS2_SB(&ip->i_inode)->sd_args.ar_posix_acl)
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return -EOPNOTSUPP;
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if (current->fsuid != ip->i_di.di_uid && !capable(CAP_FOWNER))
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return -EPERM;
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if (S_ISLNK(ip->i_di.di_mode))
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return -EOPNOTSUPP;
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if (!access && !S_ISDIR(ip->i_di.di_mode))
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return -EACCES;
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return 0;
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}
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static int acl_get(struct gfs2_inode *ip, int access, struct posix_acl **acl,
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struct gfs2_ea_location *el, char **data, unsigned int *len)
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{
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struct gfs2_ea_request er;
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struct gfs2_ea_location el_this;
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int error;
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if (!ip->i_di.di_eattr)
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return 0;
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memset(&er, 0, sizeof(struct gfs2_ea_request));
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if (access) {
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er.er_name = GFS2_POSIX_ACL_ACCESS;
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er.er_name_len = GFS2_POSIX_ACL_ACCESS_LEN;
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} else {
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er.er_name = GFS2_POSIX_ACL_DEFAULT;
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er.er_name_len = GFS2_POSIX_ACL_DEFAULT_LEN;
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}
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er.er_type = GFS2_EATYPE_SYS;
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if (!el)
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el = &el_this;
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error = gfs2_ea_find(ip, &er, 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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er.er_data_len = GFS2_EA_DATA_LEN(el->el_ea);
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er.er_data = kmalloc(er.er_data_len, GFP_KERNEL);
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error = -ENOMEM;
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if (!er.er_data)
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goto out;
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error = gfs2_ea_get_copy(ip, el, er.er_data);
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if (error)
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goto out_kfree;
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if (acl) {
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*acl = posix_acl_from_xattr(er.er_data, er.er_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 || !data)
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kfree(er.er_data);
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else {
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*data = er.er_data;
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*len = er.er_data_len;
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}
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out:
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if (error || el == &el_this)
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brelse(el->el_bh);
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return error;
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}
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/**
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* gfs2_check_acl_locked - 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_locked(struct inode *inode, int mask)
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{
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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), ACL_ACCESS, &acl, NULL, NULL, NULL);
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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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int gfs2_check_acl(struct inode *inode, int mask)
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{
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_holder i_gh;
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int error;
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error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
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if (!error) {
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error = gfs2_check_acl_locked(inode, mask);
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gfs2_glock_dq_uninit(&i_gh);
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}
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return error;
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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_di.di_mode & S_IFMT) == (mode & S_IFMT));
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ip->i_di.di_mode = mode;
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gfs2_trans_add_bh(ip->i_gl, dibh, 1);
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gfs2_dinode_out(&ip->i_di, 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_sbd *sdp = GFS2_SB(&dip->i_inode);
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struct posix_acl *acl = NULL, *clone;
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struct gfs2_ea_request er;
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mode_t mode = ip->i_di.di_mode;
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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_di.di_mode))
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return 0;
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memset(&er, 0, sizeof(struct gfs2_ea_request));
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er.er_type = GFS2_EATYPE_SYS;
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error = acl_get(dip, ACL_DEFAULT, &acl, NULL,
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&er.er_data, &er.er_data_len);
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if (error)
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return error;
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if (!acl) {
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mode &= ~current->fs->umask;
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if (mode != ip->i_di.di_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_KERNEL);
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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_di.di_mode)) {
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er.er_name = GFS2_POSIX_ACL_DEFAULT;
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er.er_name_len = GFS2_POSIX_ACL_DEFAULT_LEN;
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error = gfs2_system_eaops.eo_set(ip, &er);
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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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er.er_name = GFS2_POSIX_ACL_ACCESS;
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er.er_name_len = GFS2_POSIX_ACL_ACCESS_LEN;
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posix_acl_to_xattr(acl, er.er_data, er.er_data_len);
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er.er_mode = mode;
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er.er_flags = GFS2_ERF_MODE;
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error = gfs2_system_eaops.eo_set(ip, &er);
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if (error)
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goto out;
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} else
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munge_mode(ip, mode);
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out:
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posix_acl_release(acl);
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kfree(er.er_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, ACL_ACCESS, &acl, &el, &data, &len);
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if (error)
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return error;
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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_KERNEL);
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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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brelse(el.el_bh);
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kfree(data);
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return error;
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}
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