summaryrefslogtreecommitdiffstats
path: root/fs/ubifs/misc.h
blob: 77429be5546bc723d265b61ec72ab22a5cb368f7 (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
278
279
280
281
282
283
/*
 * This file is part of UBIFS.
 *
 * Copyright (C) 2006-2008 Nokia Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * 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, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * Authors: Artem Bityutskiy (Битюцкий Артём)
 *          Adrian Hunter
 */

/*
 * This file contains miscellaneous helper functions.
 */

#ifndef __UBIFS_MISC_H__
#define __UBIFS_MISC_H__

/**
 * ubifs_zn_dirty - check if znode is dirty.
 * @znode: znode to check
 *
 * This helper function returns %1 if @znode is dirty and %0 otherwise.
 */
static inline int ubifs_zn_dirty(const struct ubifs_znode *znode)
{
	return !!test_bit(DIRTY_ZNODE, &znode->flags);
}

/**
 * ubifs_zn_obsolete - check if znode is obsolete.
 * @znode: znode to check
 *
 * This helper function returns %1 if @znode is obsolete and %0 otherwise.
 */
static inline int ubifs_zn_obsolete(const struct ubifs_znode *znode)
{
	return !!test_bit(OBSOLETE_ZNODE, &znode->flags);
}

/**
 * ubifs_zn_cow - check if znode has to be copied on write.
 * @znode: znode to check
 *
 * This helper function returns %1 if @znode is has COW flag set and %0
 * otherwise.
 */
static inline int ubifs_zn_cow(const struct ubifs_znode *znode)
{
	return !!test_bit(COW_ZNODE, &znode->flags);
}

/**
 * ubifs_wake_up_bgt - wake up background thread.
 * @c: UBIFS file-system description object
 */
static inline void ubifs_wake_up_bgt(struct ubifs_info *c)
{
	if (c->bgt && !c->need_bgt) {
		c->need_bgt = 1;
		wake_up_process(c->bgt);
	}
}

/**
 * ubifs_tnc_find_child - find next child in znode.
 * @znode: znode to search at
 * @start: the zbranch index to start at
 *
 * This helper function looks for znode child starting at index @start. Returns
 * the child or %NULL if no children were found.
 */
static inline struct ubifs_znode *
ubifs_tnc_find_child(struct ubifs_znode *znode, int start)
{
	while (start < znode->child_cnt) {
		if (znode->zbranch[start].znode)
			return znode->zbranch[start].znode;
		start += 1;
	}

	return NULL;
}

/**
 * ubifs_inode - get UBIFS inode information by VFS 'struct inode' object.
 * @inode: the VFS 'struct inode' pointer
 */
static inline struct ubifs_inode *ubifs_inode(const struct inode *inode)
{
	return container_of(inode, struct ubifs_inode, vfs_inode);
}

/**
 * ubifs_compr_present - check if compressor was compiled in.
 * @compr_type: compressor type to check
 * @c: the UBIFS file-system description object
 *
 * This function returns %1 of compressor of type @compr_type is present, and
 * %0 if not.
 */
static inline int ubifs_compr_present(struct ubifs_info *c, int compr_type)
{
	ubifs_assert(c, compr_type >= 0 && compr_type < UBIFS_COMPR_TYPES_CNT);
	return !!ubifs_compressors[compr_type]->capi_name;
}

/**
 * ubifs_compr_name - get compressor name string by its type.
 * @compr_type: compressor type
 * @c: the UBIFS file-system description object
 *
 * This function returns compressor type string.
 */
static inline const char *ubifs_compr_name(struct ubifs_info *c, int compr_type)
{
	ubifs_assert(c, compr_type >= 0 && compr_type < UBIFS_COMPR_TYPES_CNT);
	return ubifs_compressors[compr_type]->name;
}

/**
 * ubifs_wbuf_sync - synchronize write-buffer.
 * @wbuf: write-buffer to synchronize
 *
 * This is the same as as 'ubifs_wbuf_sync_nolock()' but it does not assume
 * that the write-buffer is already locked.
 */
static inline int ubifs_wbuf_sync(struct ubifs_wbuf *wbuf)
{
	int err;

	mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead);
	err = ubifs_wbuf_sync_nolock(wbuf);
	mutex_unlock(&wbuf->io_mutex);
	return err;
}

/*
 * removed in barebox
static inline int ubifs_encode_dev(union ubifs_dev_desc *dev, dev_t rdev)
 */

/**
 * ubifs_add_dirt - add dirty space to LEB properties.
 * @c: the UBIFS file-system description object
 * @lnum: LEB to add dirty space for
 * @dirty: dirty space to add
 *
 * This is a helper function which increased amount of dirty LEB space. Returns
 * zero in case of success and a negative error code in case of failure.
 */
static inline int ubifs_add_dirt(struct ubifs_info *c, int lnum, int dirty)
{
	/* removed in barebox */
	return 0;
}

/**
 * ubifs_return_leb - return LEB to lprops.
 * @c: the UBIFS file-system description object
 * @lnum: LEB to return
 *
 * This helper function cleans the "taken" flag of a logical eraseblock in the
 * lprops. Returns zero in case of success and a negative error code in case of
 * failure.
 */
static inline int ubifs_return_leb(struct ubifs_info *c, int lnum)
{
	/* removed in barebox */
	return 0;
}

/**
 * ubifs_idx_node_sz - return index node size.
 * @c: the UBIFS file-system description object
 * @child_cnt: number of children of this index node
 */
static inline int ubifs_idx_node_sz(const struct ubifs_info *c, int child_cnt)
{
	return UBIFS_IDX_NODE_SZ + (UBIFS_BRANCH_SZ + c->key_len) * child_cnt;
}

/**
 * ubifs_idx_branch - return pointer to an index branch.
 * @c: the UBIFS file-system description object
 * @idx: index node
 * @bnum: branch number
 */
static inline
struct ubifs_branch *ubifs_idx_branch(const struct ubifs_info *c,
				      const struct ubifs_idx_node *idx,
				      int bnum)
{
	return (struct ubifs_branch *)((void *)idx->branches +
				       (UBIFS_BRANCH_SZ + c->key_len) * bnum);
}

/**
 * ubifs_idx_key - return pointer to an index key.
 * @c: the UBIFS file-system description object
 * @idx: index node
 */
static inline void *ubifs_idx_key(const struct ubifs_info *c,
				  const struct ubifs_idx_node *idx)
{
	return (void *)((struct ubifs_branch *)idx->branches)->key;
}

/**
 * ubifs_tnc_lookup - look up a file-system node.
 * @c: UBIFS file-system description object
 * @key: node key to lookup
 * @node: the node is returned here
 *
 * This function look up and reads node with key @key. The caller has to make
 * sure the @node buffer is large enough to fit the node. Returns zero in case
 * of success, %-ENOENT if the node was not found, and a negative error code in
 * case of failure.
 */
static inline int ubifs_tnc_lookup(struct ubifs_info *c,
				   const union ubifs_key *key, void *node)
{
	return ubifs_tnc_locate(c, key, node, NULL, NULL);
}

/**
 * ubifs_get_lprops - get reference to LEB properties.
 * @c: the UBIFS file-system description object
 *
 * This function locks lprops. Lprops have to be unlocked by
 * 'ubifs_release_lprops()'.
 */
static inline void ubifs_get_lprops(struct ubifs_info *c)
{
	mutex_lock(&c->lp_mutex);
}

/**
 * ubifs_release_lprops - release lprops lock.
 * @c: the UBIFS file-system description object
 *
 * This function has to be called after each 'ubifs_get_lprops()' call to
 * unlock lprops.
 */
static inline void ubifs_release_lprops(struct ubifs_info *c)
{
	ubifs_assert(c, mutex_is_locked(&c->lp_mutex));
	ubifs_assert(c, c->lst.empty_lebs >= 0 &&
		     c->lst.empty_lebs <= c->main_lebs);
	mutex_unlock(&c->lp_mutex);
}

/**
 * ubifs_next_log_lnum - switch to the next log LEB.
 * @c: UBIFS file-system description object
 * @lnum: current log LEB
 *
 * This helper function returns the log LEB number which goes next after LEB
 * 'lnum'.
 */
static inline int ubifs_next_log_lnum(const struct ubifs_info *c, int lnum)
{
	lnum += 1;
	if (lnum > c->log_last)
		lnum = UBIFS_LOG_LNUM;

	return lnum;
}

const char *ubifs_assert_action_name(struct ubifs_info *c);

#endif /* __UBIFS_MISC_H__ */