[mirror_ubuntu-bionic-kernel.git] / fs / gfs2 / resize.c

/*
 * 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, 1);
	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;
}
Commit	Line	Data
b3b94faa DT	1	/*
	2	* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
	3	* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
	4	*
	5	* This copyrighted material is made available to anyone wishing to use,
	6	* modify, copy, or redistribute it subject to the terms and conditions
	7	* of the GNU General Public License v.2.
	8	*/
	9
	10	#include <linux/sched.h>
	11	#include <linux/slab.h>
	12	#include <linux/spinlock.h>
	13	#include <linux/completion.h>
	14	#include <linux/buffer_head.h>
	15	#include <asm/semaphore.h>
	16
	17	#include "gfs2.h"
	18	#include "bmap.h"
	19	#include "dir.h"
	20	#include "glock.h"
	21	#include "inode.h"
	22	#include "jdata.h"
	23	#include "meta_io.h"
	24	#include "quota.h"
	25	#include "resize.h"
	26	#include "rgrp.h"
	27	#include "super.h"
	28	#include "trans.h"
	29
	30	/* A single transaction needs to add the structs to rindex and make the
	31	statfs change. */
	32
	33	int gfs2_resize_add_rgrps(struct gfs2_sbd sdp, char __user buf,
	34	unsigned int size)
	35	{
	36	unsigned int num = size / sizeof(struct gfs2_rindex);
	37	struct gfs2_inode *ip = sdp->sd_rindex;
	38	struct gfs2_alloc *al = NULL;
	39	struct gfs2_holder i_gh;
	40	unsigned int data_blocks, ind_blocks;
	41	int alloc_required;
	42	unsigned int x;
	43	int error;
	44
	45	gfs2_write_calc_reserv(ip, size, &data_blocks, &ind_blocks);
	46
	47	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
	48	LM_FLAG_PRIORITY \| GL_SYNC, &i_gh);
	49	if (error)
	50	return error;
	51
	52	if (!gfs2_is_jdata(ip)) {
	53	gfs2_consist_inode(ip);
	54	error = -EIO;
	55	goto out;
	56	}
	57
	58	error = gfs2_write_alloc_required(ip, ip->i_di.di_size, size,
	59	&alloc_required);
	60	if (error)
	61	goto out;
	62
	63	if (alloc_required) {
	64	al = gfs2_alloc_get(ip);
65
66	al->al_requested = data_blocks + ind_blocks;
67
68	error = gfs2_inplace_reserve(ip);
69	if (error)
70	goto out_alloc;
71
72	error = gfs2_trans_begin(sdp,
73	al->al_rgd->rd_ri.ri_length +
74	data_blocks + ind_blocks +
75	RES_DINODE + RES_STATFS, 0);
76	if (error)
77	goto out_relse;
78	} else {
79	error = gfs2_trans_begin(sdp, data_blocks +
80	RES_DINODE + RES_STATFS, 0);
81	if (error)
82	goto out;
83	}
84
85	for (x = 0; x < num; x++) {
86	struct gfs2_rindex ri;
87	char ri_buf[sizeof(struct gfs2_rindex)];
88
89	error = copy_from_user(&ri, buf, sizeof(struct gfs2_rindex));
90	if (error) {
91	error = -EFAULT;
92	goto out_trans;
93	}
94	gfs2_rindex_out(&ri, ri_buf);
95
96	error = gfs2_jdata_write_mem(ip, ri_buf, ip->i_di.di_size,
97	sizeof(struct gfs2_rindex));
98	if (error < 0)
99	goto out_trans;
100	gfs2_assert_withdraw(sdp, error == sizeof(struct gfs2_rindex));
101	error = 0;
102
103	gfs2_statfs_change(sdp, ri.ri_data, ri.ri_data, 0);
104
105	buf += sizeof(struct gfs2_rindex);
106	}
107
108	out_trans:
109	gfs2_trans_end(sdp);
110
111	out_relse:
112	if (alloc_required)
113	gfs2_inplace_release(ip);
114
115	out_alloc:
116	if (alloc_required)
117	gfs2_alloc_put(ip);
118
119	out:
120	ip->i_gl->gl_vn++;
121	gfs2_glock_dq_uninit(&i_gh);
122
123	return error;
124	}
125
126	static void drop_dentries(struct gfs2_inode *ip)
127	{
128	struct inode *inode;
129	struct dentry *d;
130
131	inode = gfs2_ip2v_lookup(ip);
132	if (!inode)
133	return;
134
135	restart:
136	spin_lock(&dcache_lock);
137	list_for_each_entry(d, &inode->i_dentry, d_alias) {
138	if (d_unhashed(d))
139	continue;
140	dget_locked(d);
141	__d_drop(d);
142	spin_unlock(&dcache_lock);
143	dput(d);
144	goto restart;
145	}
146	spin_unlock(&dcache_lock);
147
148	iput(inode);
149	}
150
151	/* This is called by an ioctl to rename an ordinary file that's represented
152	in the vfs to a hidden system file that isn't represented in the vfs. It's
153	used to add journals, along with the associated system files, to a fs. */
154
155	int gfs2_rename2system(struct gfs2_inode *ip,
156	struct gfs2_inode old_dip, char old_name,
157	struct gfs2_inode new_dip, char new_name)
158	{
159	struct gfs2_sbd *sdp = ip->i_sbd;
160	struct gfs2_holder ghs[3];
161	struct qstr old_qstr, new_qstr;
162	struct gfs2_inum inum;
163	int alloc_required;
164	struct buffer_head *dibh;
165	int error;
166
167	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, ghs);
168	gfs2_holder_init(old_dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
169	gfs2_holder_init(new_dip->i_gl, LM_ST_EXCLUSIVE, GL_SYNC, ghs + 2);
170
171	error = gfs2_glock_nq_m(3, ghs);
172	if (error)
173	goto out;
174
175	error = -EMLINK;
176	if (ip->i_di.di_nlink != 1)
177	goto out_gunlock;
178	error = -EINVAL;
179	if (!S_ISREG(ip->i_di.di_mode))
180	goto out_gunlock;
181
182	old_qstr.name = old_name;
183	old_qstr.len = strlen(old_name);
184	error = gfs2_dir_search(old_dip, &old_qstr, &inum, NULL);
185	switch (error) {
186	case 0:
187	break;
188	default:
189	goto out_gunlock;
190	}
191
192	error = -EINVAL;
193	if (!gfs2_inum_equal(&inum, &ip->i_num))
194	goto out_gunlock;
195
196	new_qstr.name = new_name;
197	new_qstr.len = strlen(new_name);
198	error = gfs2_dir_search(new_dip, &new_qstr, NULL, NULL);
199	switch (error) {
200	case -ENOENT:
201	break;
202	case 0:
203	error = -EEXIST;
204	default:
205	goto out_gunlock;
206	}
207
208	gfs2_alloc_get(ip);
209
210	error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
211	if (error)
212	goto out_alloc;
213
214	error = gfs2_diradd_alloc_required(new_dip, &new_qstr, &alloc_required);
215	if (error)
216	goto out_unhold;
217
218	if (alloc_required) {
219	struct gfs2_alloc *al = gfs2_alloc_get(new_dip);
220
221	al->al_requested = sdp->sd_max_dirres;
222
223	error = gfs2_inplace_reserve(new_dip);
224	if (error)
225	goto out_alloc2;
226
227	error = gfs2_trans_begin(sdp,
228	sdp->sd_max_dirres +
229	al->al_rgd->rd_ri.ri_length +
230	3 * RES_DINODE + RES_LEAF +
231	RES_STATFS + RES_QUOTA, 0);
232	if (error)
233	goto out_ipreserv;
234	} else {
235	error = gfs2_trans_begin(sdp,
236	3 * RES_DINODE + 2 * RES_LEAF +
237	RES_QUOTA, 0);
238	if (error)
239	goto out_unhold;
240	}
241
242	error = gfs2_dir_del(old_dip, &old_qstr);
243	if (error)
244	goto out_trans;
245
246	error = gfs2_dir_add(new_dip, &new_qstr, &ip->i_num,
247	IF2DT(ip->i_di.di_mode));
248	if (error)
249	goto out_trans;
250
251	gfs2_quota_change(ip, -ip->i_di.di_blocks, ip->i_di.di_uid,
252	ip->i_di.di_gid);
253
254	error = gfs2_meta_inode_buffer(ip, &dibh);
255	if (error)
256	goto out_trans;
257	ip->i_di.di_flags \|= GFS2_DIF_SYSTEM;
d4e9c4c3	258	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
b3b94faa DT	259	gfs2_dinode_out(&ip->i_di, dibh->b_data);
	260	brelse(dibh);
	261
	262	drop_dentries(ip);
	263
	264	out_trans:
	265	gfs2_trans_end(sdp);
	266
	267	out_ipreserv:
	268	if (alloc_required)
	269	gfs2_inplace_release(new_dip);
	270
	271	out_alloc2:
	272	if (alloc_required)
	273	gfs2_alloc_put(new_dip);
	274
	275	out_unhold:
	276	gfs2_quota_unhold(ip);
	277
	278	out_alloc:
	279	gfs2_alloc_put(ip);
	280
	281	out_gunlock:
	282	gfs2_glock_dq_m(3, ghs);
	283
	284	out:
	285	gfs2_holder_uninit(ghs);
	286	gfs2_holder_uninit(ghs + 1);
	287	gfs2_holder_uninit(ghs + 2);
	288
	289	return error;
	290	}
	291