summaryrefslogtreecommitdiffstats
path: root/kernel/fs/btrfs/btrfs_inode.h
blob: 0ef5cc13fae26f8899cad7ed30b59344c79120d4 (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
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 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., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#ifndef __BTRFS_I__
#define __BTRFS_I__

#include <linux/hash.h>
#include "extent_map.h"
#include "extent_io.h"
#include "ordered-data.h"
#include "delayed-inode.h"

/*
 * ordered_data_close is set by truncate when a file that used
 * to have good data has been truncated to zero.  When it is set
 * the btrfs file release call will add this inode to the
 * ordered operations list so that we make sure to flush out any
 * new data the application may have written before commit.
 */
#define BTRFS_INODE_ORDERED_DATA_CLOSE		0
#define BTRFS_INODE_ORPHAN_META_RESERVED	1
#define BTRFS_INODE_DUMMY			2
#define BTRFS_INODE_IN_DEFRAG			3
#define BTRFS_INODE_DELALLOC_META_RESERVED	4
#define BTRFS_INODE_HAS_ORPHAN_ITEM		5
#define BTRFS_INODE_HAS_ASYNC_EXTENT		6
#define BTRFS_INODE_NEEDS_FULL_SYNC		7
#define BTRFS_INODE_COPY_EVERYTHING		8
#define BTRFS_INODE_IN_DELALLOC_LIST		9
#define BTRFS_INODE_READDIO_NEED_LOCK		10
#define BTRFS_INODE_HAS_PROPS		        11
/*
 * The following 3 bits are meant only for the btree inode.
 * When any of them is set, it means an error happened while writing an
 * extent buffer belonging to:
 * 1) a non-log btree
 * 2) a log btree and first log sub-transaction
 * 3) a log btree and second log sub-transaction
 */
#define BTRFS_INODE_BTREE_ERR		        12
#define BTRFS_INODE_BTREE_LOG1_ERR		13
#define BTRFS_INODE_BTREE_LOG2_ERR		14

/* in memory btrfs inode */
struct btrfs_inode {
	/* which subvolume this inode belongs to */
	struct btrfs_root *root;

	/* key used to find this inode on disk.  This is used by the code
	 * to read in roots of subvolumes
	 */
	struct btrfs_key location;

	/*
	 * Lock for counters and all fields used to determine if the inode is in
	 * the log or not (last_trans, last_sub_trans, last_log_commit,
	 * logged_trans).
	 */
	spinlock_t lock;

	/* the extent_tree has caches of all the extent mappings to disk */
	struct extent_map_tree extent_tree;

	/* the io_tree does range state (DIRTY, LOCKED etc) */
	struct extent_io_tree io_tree;

	/* special utility tree used to record which mirrors have already been
	 * tried when checksums fail for a given block
	 */
	struct extent_io_tree io_failure_tree;

	/* held while logging the inode in tree-log.c */
	struct mutex log_mutex;

	/* held while doing delalloc reservations */
	struct mutex delalloc_mutex;

	/* used to order data wrt metadata */
	struct btrfs_ordered_inode_tree ordered_tree;

	/* list of all the delalloc inodes in the FS.  There are times we need
	 * to write all the delalloc pages to disk, and this list is used
	 * to walk them all.
	 */
	struct list_head delalloc_inodes;

	/* node for the red-black tree that links inodes in subvolume root */
	struct rb_node rb_node;

	unsigned long runtime_flags;

	/* Keep track of who's O_SYNC/fsyncing currently */
	atomic_t sync_writers;

	/* full 64 bit generation number, struct vfs_inode doesn't have a big
	 * enough field for this.
	 */
	u64 generation;

	/*
	 * transid of the trans_handle that last modified this inode
	 */
	u64 last_trans;

	/*
	 * transid that last logged this inode
	 */
	u64 logged_trans;

	/*
	 * log transid when this inode was last modified
	 */
	int last_sub_trans;

	/* a local copy of root's last_log_commit */
	int last_log_commit;

	/* total number of bytes pending delalloc, used by stat to calc the
	 * real block usage of the file
	 */
	u64 delalloc_bytes;

	/*
	 * total number of bytes pending defrag, used by stat to check whether
	 * it needs COW.
	 */
	u64 defrag_bytes;

	/*
	 * the size of the file stored in the metadata on disk.  data=ordered
	 * means the in-memory i_size might be larger than the size on disk
	 * because not all the blocks are written yet.
	 */
	u64 disk_i_size;

	/*
	 * if this is a directory then index_cnt is the counter for the index
	 * number for new files that are created
	 */
	u64 index_cnt;

	/* Cache the directory index number to speed the dir/file remove */
	u64 dir_index;

	/* the fsync log has some corner cases that mean we have to check
	 * directories to see if any unlinks have been done before
	 * the directory was logged.  See tree-log.c for all the
	 * details
	 */
	u64 last_unlink_trans;

	/*
	 * Number of bytes outstanding that are going to need csums.  This is
	 * used in ENOSPC accounting.
	 */
	u64 csum_bytes;

	/* flags field from the on disk inode */
	u32 flags;

	/*
	 * Counters to keep track of the number of extent item's we may use due
	 * to delalloc and such.  outstanding_extents is the number of extent
	 * items we think we'll end up using, and reserved_extents is the number
	 * of extent items we've reserved metadata for.
	 */
	unsigned outstanding_extents;
	unsigned reserved_extents;

	/*
	 * always compress this one file
	 */
	unsigned force_compress;

	struct btrfs_delayed_node *delayed_node;

	/* File creation time. */
	struct timespec i_otime;

	struct inode vfs_inode;
};

extern unsigned char btrfs_filetype_table[];

static inline struct btrfs_inode *BTRFS_I(struct inode *inode)
{
	return container_of(inode, struct btrfs_inode, vfs_inode);
}

static inline unsigned long btrfs_inode_hash(u64 objectid,
					     const struct btrfs_root *root)
{
	u64 h = objectid ^ (root->objectid * GOLDEN_RATIO_PRIME);

#if BITS_PER_LONG == 32
	h = (h >> 32) ^ (h & 0xffffffff);
#endif

	return (unsigned long)h;
}

static inline void btrfs_insert_inode_hash(struct inode *inode)
{
	unsigned long h = btrfs_inode_hash(inode->i_ino, BTRFS_I(inode)->root);

	__insert_inode_hash(inode, h);
}

static inline u64 btrfs_ino(struct inode *inode)
{
	u64 ino = BTRFS_I(inode)->location.objectid;

	/*
	 * !ino: btree_inode
	 * type == BTRFS_ROOT_ITEM_KEY: subvol dir
	 */
	if (!ino || BTRFS_I(inode)->location.type == BTRFS_ROOT_ITEM_KEY)
		ino = inode->i_ino;
	return ino;
}

static inline void btrfs_i_size_write(struct inode *inode, u64 size)
{
	i_size_write(inode, size);
	BTRFS_I(inode)->disk_i_size = size;
}

static inline bool btrfs_is_free_space_inode(struct inode *inode)
{
	struct btrfs_root *root = BTRFS_I(inode)->root;

	if (root == root->fs_info->tree_root &&
	    btrfs_ino(inode) != BTRFS_BTREE_INODE_OBJECTID)
		return true;
	if (BTRFS_I(inode)->location.objectid == BTRFS_FREE_INO_OBJECTID)
		return true;
	return false;
}

static inline int btrfs_inode_in_log(struct inode *inode, u64 generation)
{
	int ret = 0;

	spin_lock(&BTRFS_I(inode)->lock);
	if (BTRFS_I(inode)->logged_trans == generation &&
	    BTRFS_I(inode)->last_sub_trans <=
	    BTRFS_I(inode)->last_log_commit &&
	    BTRFS_I(inode)->last_sub_trans <=
	    BTRFS_I(inode)->root->last_log_commit) {
		/*
		 * After a ranged fsync we might have left some extent maps
		 * (that fall outside the fsync's range). So return false
		 * here if the list isn't empty, to make sure btrfs_log_inode()
		 * will be called and process those extent maps.
		 */
		smp_mb();
		if (list_empty(&BTRFS_I(inode)->extent_tree.modified_extents))
			ret = 1;
	}
	spin_unlock(&BTRFS_I(inode)->lock);
	return ret;
}

#define BTRFS_DIO_ORIG_BIO_SUBMITTED	0x1

struct btrfs_dio_private {
	struct inode *inode;
	unsigned long flags;
	u64 logical_offset;
	u64 disk_bytenr;
	u64 bytes;
	void *private;

	/* number of bios pending for this dio */
	atomic_t pending_bios;

	/* IO errors */
	int errors;

	/* orig_bio is our btrfs_io_bio */
	struct bio *orig_bio;

	/* dio_bio came from fs/direct-io.c */
	struct bio *dio_bio;

	/*
	 * The original bio may be splited to several sub-bios, this is
	 * done during endio of sub-bios
	 */
	int (*subio_endio)(struct inode *, struct btrfs_io_bio *, int);
};

/*
 * Disable DIO read nolock optimization, so new dio readers will be forced
 * to grab i_mutex. It is used to avoid the endless truncate due to
 * nonlocked dio read.
 */
static inline void btrfs_inode_block_unlocked_dio(struct inode *inode)
{
	set_bit(BTRFS_INODE_READDIO_NEED_LOCK, &BTRFS_I(inode)->runtime_flags);
	smp_mb();
}

static inline void btrfs_inode_resume_unlocked_dio(struct inode *inode)
{
	smp_mb__before_atomic();
	clear_bit(BTRFS_INODE_READDIO_NEED_LOCK,
		  &BTRFS_I(inode)->runtime_flags);
}

bool btrfs_page_exists_in_range(struct inode *inode, loff_t start, loff_t end);

#endif