/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2005 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 v.2.
*/
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <asm/semaphore.h>
#include "gfs2.h"
#include "bmap.h"
#include "dir.h"
#include "glock.h"
#include "inode.h"
#include "jdata.h"
#include "meta_io.h"
#include "quota.h"
#include "resize.h"
#include "rgrp.h"
#include "super.h"
#include "trans.h"
/* A single transaction needs to add the structs to rindex and make the
statfs change. */
int gfs2_resize_add_rgrps(struct gfs2_sbd *sdp, char __user *buf,
unsigned int size)
{
unsigned int num = size / sizeof(struct gfs2_rindex);
struct gfs2_inode *ip = sdp->sd_rindex;
struct gfs2_alloc *al = NULL;
struct gfs2_holder i_gh;
unsigned int data_blocks, ind_blocks;
int alloc_required;
unsigned int x;
int error;
gfs2_write_calc_reserv(ip, size, &data_blocks, &ind_blocks);
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
LM_FLAG_PRIORITY | GL_SYNC, &i_gh);
if (error)
return error;
if (!gfs2_is_jdata(ip)) {
gfs2_consist_inode(ip);
error = -EIO;
goto out;
}
error = gfs2_write_alloc_required(ip, ip->i_di.di_size, size,
&alloc_required);
if (error)
goto out;
if (alloc_required) {
al = gfs2_alloc_get(ip);
al->al_requested = data_blocks + ind_blocks;
error = gfs2_inplace_reserve(ip);
if (error)
goto out_alloc;
error = gfs2_trans_begin(sdp,
al->al_rgd->rd_ri.ri_length +
data_blocks + ind_blocks +
RES_DINODE + RES_STATFS, 0);
if (error)
goto out_relse;
} else {
error = gfs2_trans_begin(sdp, data_blocks +
RES_DINODE + RES_STATFS, 0);
if (error)
goto out;
}
for (x = 0; x < num; x++) {
struct gfs2_rindex ri;
char ri_buf[sizeof(struct gfs2_rindex)];
error = copy_from_user(&ri, buf, sizeof(struct gfs2_rindex));
if (error) {
error = -EFAULT;
goto out_trans;
}
gfs2_rindex_out(&ri, ri_buf);
error = gfs2_jdata_write_mem(ip, ri_buf, ip->i_di.di_size,
sizeof(struct gfs2_rindex));
if (error < 0)
goto out_trans;
gfs2_assert_withdraw(sdp, error == sizeof(struct gfs2_rindex));
error = 0;
gfs2_statfs_change(sdp, ri.ri_data, ri.ri_data, 0);
buf += sizeof(struct gfs2_rindex);
}
out_trans:
gfs2_trans_end(sdp);
out_relse:
if (alloc_required)
gfs2_inplace_release(ip);
out_alloc:
if (alloc_required)
gfs2_alloc_put(ip);
out:
ip->i_gl->gl_vn++;
gfs2_glock_dq_uninit(&i_gh);
return error;
}
static void drop_dentries(struct gfs2_inode *ip)
{
struct inode *inode;
struct dentry *d;
inode = gfs2_ip2v_lookup(ip);
if (!inode)
return;
restart:
spin_lock(&dcache_lock);
list_for_each_entry(d, &inode->i_dentry, d_alias) {
if (d_unhashed(d))
continue;
dget_locked(d);
__d_drop(d);
spin_unlock(&dcache_lock);
dput(d);
goto restart;
}
spin_unlock(&dcache_lock);
iput(inode);
}
/* This is called by an ioctl to rename an ordinary file that's represented
in the vfs to a hidden system file that isn't represented in the vfs. It's
used to add journals, along with the associated system files, to a fs. */
int gfs2_rename2system(struct gfs2_inode *ip,
struct gfs2_inode *old_dip, char *old_name,
struct gfs2_inode *new_dip, char *new_name)
{
struct gfs2_sbd *sdp = ip->i_sbd;
struct gfs2_holder ghs[3];
struct qstr old_qstr, new_qstr;
struct gfs2_inum inum;
int alloc_required;
struct buffer_head *dibh;
int error;
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, ghs);
gfs2_holder_init(old_dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
gfs2_holder_init(new_dip->i_gl, LM_ST_EXCLUSIVE, GL_SYNC, ghs + 2);
error = gfs2_glock_nq_m(3, ghs);
if (error)
goto out;
error = -EMLINK;
if (ip->i_di.di_nlink != 1)
goto out_gunlock;
error = -EINVAL;
if (!S_ISREG(ip->i_di.di_mode))
goto out_gunlock;
old_qstr.name = old_name;
old_qstr.len = strlen(old_name);
error = gfs2_dir_search(old_dip, &old_qstr, &inum, NULL);
switch (error) {
case 0:
break;
default:
goto out_gunlock;
}
error = -EINVAL;
if (!gfs2_inum_equal(&inum, &ip->i_num))
goto out_gunlock;
new_qstr.name = new_name;
new_qstr.len = strlen(new_name);
error = gfs2_dir_search(new_dip, &new_qstr, NULL, NULL);
switch (error) {
case -ENOENT:
break;
case 0:
error = -EEXIST;
default:
goto out_gunlock;
}
gfs2_alloc_get(ip);
error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
goto out_alloc;
error = gfs2_diradd_alloc_required(new_dip, &new_qstr, &alloc_required);
if (error)
goto out_unhold;
if (alloc_required) {
struct gfs2_alloc *al = gfs2_alloc_get(new_dip);
al->al_requested = sdp->sd_max_dirres;
error = gfs2_inplace_reserve(new_dip);
if (error)
goto out_alloc2;
error = gfs2_trans_begin(sdp,
sdp->sd_max_dirres +
al->al_rgd->rd_ri.ri_length +
3 * RES_DINODE + RES_LEAF +
RES_STATFS + RES_QUOTA, 0);
if (error)
goto out_ipreserv;
} else {
error = gfs2_trans_begin(sdp,
3 * RES_DINODE + 2 * RES_LEAF +
RES_QUOTA, 0);
if (error)
goto out_unhold;
}
error = gfs2_dir_del(old_dip, &old_qstr);
if (error)
goto out_trans;
error = gfs2_dir_add(new_dip, &new_qstr, &ip->i_num,
IF2DT(ip->i_di.di_mode));
if (error)
goto out_trans;
gfs2_quota_change(ip, -ip->i_di.di_blocks, ip->i_di.di_uid,
ip->i_di.di_gid);
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
goto out_trans;
ip->i_di.di_flags |= GFS2_DIF_SYSTEM;
gfs2_trans_add_bh(ip->i_gl, dibh);
gfs2_dinode_out(&ip->i_di, dibh->b_data);
brelse(dibh);
drop_dentries(ip);
out_trans:
gfs2_trans_end(sdp);
out_ipreserv:
if (alloc_required)
gfs2_inplace_release(new_dip);
out_alloc2:
if (alloc_required)
gfs2_alloc_put(new_dip);
out_unhold:
gfs2_quota_unhold(ip);
out_alloc:
gfs2_alloc_put(ip);
out_gunlock:
gfs2_glock_dq_m(3, ghs);
out:
gfs2_holder_uninit(ghs);
gfs2_holder_uninit(ghs + 1);
gfs2_holder_uninit(ghs + 2);
return error;
}
