summaryrefslogtreecommitdiff
path: root/fs/aufs/iinfo.c
blob: 0eaa7de7e4f3c4e0a55ab131cf8c5506449f9556 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
/*
 * Copyright (C) 2005-2015 Junjiro R. Okajima
 *
 * This program, aufs is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * inode private data
 */

#include "aufs.h"

struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex)
{
	struct inode *h_inode;

	IiMustAnyLock(inode);

	h_inode = au_ii(inode)->ii_hinode[0 + bindex].hi_inode;
	AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0);
	return h_inode;
}

/* todo: hard/soft set? */
void au_hiput(struct au_hinode *hinode)
{
	au_hn_free(hinode);
	dput(hinode->hi_whdentry);
	iput(hinode->hi_inode);
}

unsigned int au_hi_flags(struct inode *inode, int isdir)
{
	unsigned int flags;
	const unsigned int mnt_flags = au_mntflags(inode->i_sb);

	flags = 0;
	if (au_opt_test(mnt_flags, XINO))
		au_fset_hi(flags, XINO);
	if (isdir && au_opt_test(mnt_flags, UDBA_HNOTIFY))
		au_fset_hi(flags, HNOTIFY);
	return flags;
}

void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
		   struct inode *h_inode, unsigned int flags)
{
	struct au_hinode *hinode;
	struct inode *hi;
	struct au_iinfo *iinfo = au_ii(inode);

	IiMustWriteLock(inode);

	hinode = iinfo->ii_hinode + bindex;
	hi = hinode->hi_inode;
	AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0);

	if (hi)
		au_hiput(hinode);
	hinode->hi_inode = h_inode;
	if (h_inode) {
		int err;
		struct super_block *sb = inode->i_sb;
		struct au_branch *br;

		AuDebugOn(inode->i_mode
			  && (h_inode->i_mode & S_IFMT)
			  != (inode->i_mode & S_IFMT));
		if (bindex == iinfo->ii_bstart)
			au_cpup_igen(inode, h_inode);
		br = au_sbr(sb, bindex);
		hinode->hi_id = br->br_id;
		if (au_ftest_hi(flags, XINO)) {
			err = au_xino_write(sb, bindex, h_inode->i_ino,
					    inode->i_ino);
			if (unlikely(err))
				AuIOErr1("failed au_xino_write() %d\n", err);
		}

		if (au_ftest_hi(flags, HNOTIFY)
		    && au_br_hnotifyable(br->br_perm)) {
			err = au_hn_alloc(hinode, inode);
			if (unlikely(err))
				AuIOErr1("au_hn_alloc() %d\n", err);
		}
	}
}

void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex,
		  struct dentry *h_wh)
{
	struct au_hinode *hinode;

	IiMustWriteLock(inode);

	hinode = au_ii(inode)->ii_hinode + bindex;
	AuDebugOn(hinode->hi_whdentry);
	hinode->hi_whdentry = h_wh;
}

void au_update_iigen(struct inode *inode, int half)
{
	struct au_iinfo *iinfo;
	struct au_iigen *iigen;
	unsigned int sigen;

	sigen = au_sigen(inode->i_sb);
	iinfo = au_ii(inode);
	iigen = &iinfo->ii_generation;
	spin_lock(&iinfo->ii_genspin);
	iigen->ig_generation = sigen;
	if (half)
		au_ig_fset(iigen->ig_flags, HALF_REFRESHED);
	else
		au_ig_fclr(iigen->ig_flags, HALF_REFRESHED);
	spin_unlock(&iinfo->ii_genspin);
}

/* it may be called at remount time, too */
void au_update_ibrange(struct inode *inode, int do_put_zero)
{
	struct au_iinfo *iinfo;
	aufs_bindex_t bindex, bend;

	iinfo = au_ii(inode);
	if (!iinfo)
		return;

	IiMustWriteLock(inode);

	if (do_put_zero && iinfo->ii_bstart >= 0) {
		for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend;
		     bindex++) {
			struct inode *h_i;

			h_i = iinfo->ii_hinode[0 + bindex].hi_inode;
			if (h_i
			    && !h_i->i_nlink
			    && !(h_i->i_state & I_LINKABLE))
				au_set_h_iptr(inode, bindex, NULL, 0);
		}
	}

	iinfo->ii_bstart = -1;
	iinfo->ii_bend = -1;
	bend = au_sbend(inode->i_sb);
	for (bindex = 0; bindex <= bend; bindex++)
		if (iinfo->ii_hinode[0 + bindex].hi_inode) {
			iinfo->ii_bstart = bindex;
			break;
		}
	if (iinfo->ii_bstart >= 0)
		for (bindex = bend; bindex >= iinfo->ii_bstart; bindex--)
			if (iinfo->ii_hinode[0 + bindex].hi_inode) {
				iinfo->ii_bend = bindex;
				break;
			}
	AuDebugOn(iinfo->ii_bstart > iinfo->ii_bend);
}

/* ---------------------------------------------------------------------- */

void au_icntnr_init_once(void *_c)
{
	struct au_icntnr *c = _c;
	struct au_iinfo *iinfo = &c->iinfo;
	static struct lock_class_key aufs_ii;

	spin_lock_init(&iinfo->ii_genspin);
	au_rw_init(&iinfo->ii_rwsem);
	au_rw_class(&iinfo->ii_rwsem, &aufs_ii);
	inode_init_once(&c->vfs_inode);
}

int au_iinfo_init(struct inode *inode)
{
	struct au_iinfo *iinfo;
	struct super_block *sb;
	int nbr, i;

	sb = inode->i_sb;
	iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo);
	nbr = au_sbend(sb) + 1;
	if (unlikely(nbr <= 0))
		nbr = 1;
	iinfo->ii_hinode = kcalloc(nbr, sizeof(*iinfo->ii_hinode), GFP_NOFS);
	if (iinfo->ii_hinode) {
		au_ninodes_inc(sb);
		for (i = 0; i < nbr; i++)
			iinfo->ii_hinode[i].hi_id = -1;

		iinfo->ii_generation.ig_generation = au_sigen(sb);
		iinfo->ii_bstart = -1;
		iinfo->ii_bend = -1;
		iinfo->ii_vdir = NULL;
		return 0;
	}
	return -ENOMEM;
}

int au_ii_realloc(struct au_iinfo *iinfo, int nbr)
{
	int err, sz;
	struct au_hinode *hip;

	AuRwMustWriteLock(&iinfo->ii_rwsem);

	err = -ENOMEM;
	sz = sizeof(*hip) * (iinfo->ii_bend + 1);
	if (!sz)
		sz = sizeof(*hip);
	hip = au_kzrealloc(iinfo->ii_hinode, sz, sizeof(*hip) * nbr, GFP_NOFS);
	if (hip) {
		iinfo->ii_hinode = hip;
		err = 0;
	}

	return err;
}

void au_iinfo_fin(struct inode *inode)
{
	struct au_iinfo *iinfo;
	struct au_hinode *hi;
	struct super_block *sb;
	aufs_bindex_t bindex, bend;
	const unsigned char unlinked = !inode->i_nlink;

	iinfo = au_ii(inode);
	/* bad_inode case */
	if (!iinfo)
		return;

	sb = inode->i_sb;
	au_ninodes_dec(sb);
	if (si_pid_test(sb))
		au_xino_delete_inode(inode, unlinked);
	else {
		/*
		 * it is safe to hide the dependency between sbinfo and
		 * sb->s_umount.
		 */
		lockdep_off();
		si_noflush_read_lock(sb);
		au_xino_delete_inode(inode, unlinked);
		si_read_unlock(sb);
		lockdep_on();
	}

	if (iinfo->ii_vdir)
		au_vdir_free(iinfo->ii_vdir);

	bindex = iinfo->ii_bstart;
	if (bindex >= 0) {
		hi = iinfo->ii_hinode + bindex;
		bend = iinfo->ii_bend;
		while (bindex++ <= bend) {
			if (hi->hi_inode)
				au_hiput(hi);
			hi++;
		}
	}
	kfree(iinfo->ii_hinode);
	iinfo->ii_hinode = NULL;
	AuRwDestroy(&iinfo->ii_rwsem);
}