summaryrefslogtreecommitdiff
path: root/fs/xfs/libxfs/xfs_rtbitmap.h
blob: c0637057d69c4816a9c7de41b82f9232a81d9e33 (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
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#ifndef __XFS_RTBITMAP_H__
#define	__XFS_RTBITMAP_H__

struct xfs_rtalloc_args {
	struct xfs_mount	*mp;
	struct xfs_trans	*tp;

	struct xfs_buf		*rbmbp;	/* bitmap block buffer */
	struct xfs_buf		*sumbp;	/* summary block buffer */

	xfs_fileoff_t		rbmoff;	/* bitmap block number */
	xfs_fileoff_t		sumoff;	/* summary block number */
};

static inline xfs_rtblock_t
xfs_rtx_to_rtb(
	struct xfs_mount	*mp,
	xfs_rtxnum_t		rtx)
{
	if (mp->m_rtxblklog >= 0)
		return rtx << mp->m_rtxblklog;

	return rtx * mp->m_sb.sb_rextsize;
}

static inline xfs_extlen_t
xfs_rtxlen_to_extlen(
	struct xfs_mount	*mp,
	xfs_rtxlen_t		rtxlen)
{
	if (mp->m_rtxblklog >= 0)
		return rtxlen << mp->m_rtxblklog;

	return rtxlen * mp->m_sb.sb_rextsize;
}

/* Compute the misalignment between an extent length and a realtime extent .*/
static inline unsigned int
xfs_extlen_to_rtxmod(
	struct xfs_mount	*mp,
	xfs_extlen_t		len)
{
	if (mp->m_rtxblklog >= 0)
		return len & mp->m_rtxblkmask;

	return len % mp->m_sb.sb_rextsize;
}

static inline xfs_rtxlen_t
xfs_extlen_to_rtxlen(
	struct xfs_mount	*mp,
	xfs_extlen_t		len)
{
	if (mp->m_rtxblklog >= 0)
		return len >> mp->m_rtxblklog;

	return len / mp->m_sb.sb_rextsize;
}

/* Convert an rt block number into an rt extent number. */
static inline xfs_rtxnum_t
xfs_rtb_to_rtx(
	struct xfs_mount	*mp,
	xfs_rtblock_t		rtbno)
{
	if (likely(mp->m_rtxblklog >= 0))
		return rtbno >> mp->m_rtxblklog;

	return div_u64(rtbno, mp->m_sb.sb_rextsize);
}

/* Return the offset of an rt block number within an rt extent. */
static inline xfs_extlen_t
xfs_rtb_to_rtxoff(
	struct xfs_mount	*mp,
	xfs_rtblock_t		rtbno)
{
	if (likely(mp->m_rtxblklog >= 0))
		return rtbno & mp->m_rtxblkmask;

	return do_div(rtbno, mp->m_sb.sb_rextsize);
}

/*
 * Crack an rt block number into an rt extent number and an offset within that
 * rt extent.  Returns the rt extent number directly and the offset in @off.
 */
static inline xfs_rtxnum_t
xfs_rtb_to_rtxrem(
	struct xfs_mount	*mp,
	xfs_rtblock_t		rtbno,
	xfs_extlen_t		*off)
{
	if (likely(mp->m_rtxblklog >= 0)) {
		*off = rtbno & mp->m_rtxblkmask;
		return rtbno >> mp->m_rtxblklog;
	}

	return div_u64_rem(rtbno, mp->m_sb.sb_rextsize, off);
}

/*
 * Convert an rt block number into an rt extent number, rounding up to the next
 * rt extent if the rt block is not aligned to an rt extent boundary.
 */
static inline xfs_rtxnum_t
xfs_rtb_to_rtxup(
	struct xfs_mount	*mp,
	xfs_rtblock_t		rtbno)
{
	if (likely(mp->m_rtxblklog >= 0)) {
		if (rtbno & mp->m_rtxblkmask)
			return (rtbno >> mp->m_rtxblklog) + 1;
		return rtbno >> mp->m_rtxblklog;
	}

	if (do_div(rtbno, mp->m_sb.sb_rextsize))
		rtbno++;
	return rtbno;
}

/* Round this rtblock up to the nearest rt extent size. */
static inline xfs_rtblock_t
xfs_rtb_roundup_rtx(
	struct xfs_mount	*mp,
	xfs_rtblock_t		rtbno)
{
	return roundup_64(rtbno, mp->m_sb.sb_rextsize);
}

/* Round this rtblock down to the nearest rt extent size. */
static inline xfs_rtblock_t
xfs_rtb_rounddown_rtx(
	struct xfs_mount	*mp,
	xfs_rtblock_t		rtbno)
{
	return rounddown_64(rtbno, mp->m_sb.sb_rextsize);
}

/* Convert an rt extent number to a file block offset in the rt bitmap file. */
static inline xfs_fileoff_t
xfs_rtx_to_rbmblock(
	struct xfs_mount	*mp,
	xfs_rtxnum_t		rtx)
{
	return rtx >> mp->m_blkbit_log;
}

/* Convert an rt extent number to a word offset within an rt bitmap block. */
static inline unsigned int
xfs_rtx_to_rbmword(
	struct xfs_mount	*mp,
	xfs_rtxnum_t		rtx)
{
	return (rtx >> XFS_NBWORDLOG) & (mp->m_blockwsize - 1);
}

/* Convert a file block offset in the rt bitmap file to an rt extent number. */
static inline xfs_rtxnum_t
xfs_rbmblock_to_rtx(
	struct xfs_mount	*mp,
	xfs_fileoff_t		rbmoff)
{
	return rbmoff << mp->m_blkbit_log;
}

/* Return a pointer to a bitmap word within a rt bitmap block. */
static inline union xfs_rtword_raw *
xfs_rbmblock_wordptr(
	struct xfs_rtalloc_args	*args,
	unsigned int		index)
{
	union xfs_rtword_raw	*words = args->rbmbp->b_addr;

	return words + index;
}

/* Convert an ondisk bitmap word to its incore representation. */
static inline xfs_rtword_t
xfs_rtbitmap_getword(
	struct xfs_rtalloc_args	*args,
	unsigned int		index)
{
	union xfs_rtword_raw	*word = xfs_rbmblock_wordptr(args, index);

	return word->old;
}

/* Set an ondisk bitmap word from an incore representation. */
static inline void
xfs_rtbitmap_setword(
	struct xfs_rtalloc_args	*args,
	unsigned int		index,
	xfs_rtword_t		value)
{
	union xfs_rtword_raw	*word = xfs_rbmblock_wordptr(args, index);

	word->old = value;
}

/*
 * Convert a rt extent length and rt bitmap block number to a xfs_suminfo_t
 * offset within the rt summary file.
 */
static inline xfs_rtsumoff_t
xfs_rtsumoffs(
	struct xfs_mount	*mp,
	int			log2_len,
	xfs_fileoff_t		rbmoff)
{
	return log2_len * mp->m_sb.sb_rbmblocks + rbmoff;
}

/*
 * Convert an xfs_suminfo_t offset to a file block offset within the rt summary
 * file.
 */
static inline xfs_fileoff_t
xfs_rtsumoffs_to_block(
	struct xfs_mount	*mp,
	xfs_rtsumoff_t		rsumoff)
{
	return XFS_B_TO_FSBT(mp, rsumoff * sizeof(xfs_suminfo_t));
}

/*
 * Convert an xfs_suminfo_t offset to an info word offset within an rt summary
 * block.
 */
static inline unsigned int
xfs_rtsumoffs_to_infoword(
	struct xfs_mount	*mp,
	xfs_rtsumoff_t		rsumoff)
{
	unsigned int		mask = mp->m_blockmask >> XFS_SUMINFOLOG;

	return rsumoff & mask;
}

/* Return a pointer to a summary info word within a rt summary block. */
static inline union xfs_suminfo_raw *
xfs_rsumblock_infoptr(
	struct xfs_rtalloc_args	*args,
	unsigned int		index)
{
	union xfs_suminfo_raw	*info = args->sumbp->b_addr;

	return info + index;
}

/* Get the current value of a summary counter. */
static inline xfs_suminfo_t
xfs_suminfo_get(
	struct xfs_rtalloc_args	*args,
	unsigned int		index)
{
	union xfs_suminfo_raw	*info = xfs_rsumblock_infoptr(args, index);

	return info->old;
}

/* Add to the current value of a summary counter and return the new value. */
static inline xfs_suminfo_t
xfs_suminfo_add(
	struct xfs_rtalloc_args	*args,
	unsigned int		index,
	int			delta)
{
	union xfs_suminfo_raw	*info = xfs_rsumblock_infoptr(args, index);

	info->old += delta;
	return info->old;
}

/*
 * Functions for walking free space rtextents in the realtime bitmap.
 */
struct xfs_rtalloc_rec {
	xfs_rtxnum_t		ar_startext;
	xfs_rtbxlen_t		ar_extcount;
};

typedef int (*xfs_rtalloc_query_range_fn)(
	struct xfs_mount		*mp,
	struct xfs_trans		*tp,
	const struct xfs_rtalloc_rec	*rec,
	void				*priv);

#ifdef CONFIG_XFS_RT
void xfs_rtbuf_cache_relse(struct xfs_rtalloc_args *args);

int xfs_rtbuf_get(struct xfs_rtalloc_args *args, xfs_fileoff_t block,
		int issum);

static inline int
xfs_rtbitmap_read_buf(
	struct xfs_rtalloc_args		*args,
	xfs_fileoff_t			block)
{
	return xfs_rtbuf_get(args, block, 0);
}

static inline int
xfs_rtsummary_read_buf(
	struct xfs_rtalloc_args		*args,
	xfs_fileoff_t			block)
{
	return xfs_rtbuf_get(args, block, 1);
}

int xfs_rtcheck_range(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
		xfs_rtxlen_t len, int val, xfs_rtxnum_t *new, int *stat);
int xfs_rtfind_back(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
		xfs_rtxnum_t limit, xfs_rtxnum_t *rtblock);
int xfs_rtfind_forw(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
		xfs_rtxnum_t limit, xfs_rtxnum_t *rtblock);
int xfs_rtmodify_range(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
		xfs_rtxlen_t len, int val);
int xfs_rtmodify_summary_int(struct xfs_rtalloc_args *args, int log,
		xfs_fileoff_t bbno, int delta, xfs_suminfo_t *sum);
int xfs_rtmodify_summary(struct xfs_rtalloc_args *args, int log,
		xfs_fileoff_t bbno, int delta);
int xfs_rtfree_range(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
		xfs_rtxlen_t len);
int xfs_rtalloc_query_range(struct xfs_mount *mp, struct xfs_trans *tp,
		const struct xfs_rtalloc_rec *low_rec,
		const struct xfs_rtalloc_rec *high_rec,
		xfs_rtalloc_query_range_fn fn, void *priv);
int xfs_rtalloc_query_all(struct xfs_mount *mp, struct xfs_trans *tp,
			  xfs_rtalloc_query_range_fn fn,
			  void *priv);
int xfs_rtalloc_extent_is_free(struct xfs_mount *mp, struct xfs_trans *tp,
			       xfs_rtxnum_t start, xfs_rtxlen_t len,
			       bool *is_free);
/*
 * Free an extent in the realtime subvolume.  Length is expressed in
 * realtime extents, as is the block number.
 */
int					/* error */
xfs_rtfree_extent(
	struct xfs_trans	*tp,	/* transaction pointer */
	xfs_rtxnum_t		start,	/* starting rtext number to free */
	xfs_rtxlen_t		len);	/* length of extent freed */

/* Same as above, but in units of rt blocks. */
int xfs_rtfree_blocks(struct xfs_trans *tp, xfs_fsblock_t rtbno,
		xfs_filblks_t rtlen);

xfs_filblks_t xfs_rtbitmap_blockcount(struct xfs_mount *mp, xfs_rtbxlen_t
		rtextents);
unsigned long long xfs_rtbitmap_wordcount(struct xfs_mount *mp,
		xfs_rtbxlen_t rtextents);

xfs_filblks_t xfs_rtsummary_blockcount(struct xfs_mount *mp,
		unsigned int rsumlevels, xfs_extlen_t rbmblocks);
unsigned long long xfs_rtsummary_wordcount(struct xfs_mount *mp,
		unsigned int rsumlevels, xfs_extlen_t rbmblocks);
#else /* CONFIG_XFS_RT */
# define xfs_rtfree_extent(t,b,l)			(-ENOSYS)
# define xfs_rtfree_blocks(t,rb,rl)			(-ENOSYS)
# define xfs_rtalloc_query_range(m,t,l,h,f,p)		(-ENOSYS)
# define xfs_rtalloc_query_all(m,t,f,p)			(-ENOSYS)
# define xfs_rtbitmap_read_buf(a,b)			(-ENOSYS)
# define xfs_rtsummary_read_buf(a,b)			(-ENOSYS)
# define xfs_rtbuf_cache_relse(a)			(0)
# define xfs_rtalloc_extent_is_free(m,t,s,l,i)		(-ENOSYS)
static inline xfs_filblks_t
xfs_rtbitmap_blockcount(struct xfs_mount *mp, xfs_rtbxlen_t rtextents)
{
	/* shut up gcc */
	return 0;
}
# define xfs_rtbitmap_wordcount(mp, r)			(0)
# define xfs_rtsummary_blockcount(mp, l, b)		(0)
# define xfs_rtsummary_wordcount(mp, l, b)		(0)
#endif /* CONFIG_XFS_RT */

#endif /* __XFS_RTBITMAP_H__ */