2 * Copyright (c) 2008 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sbin/hammer/blockmap.c,v 1.2 2008/06/17 04:03:38 dillon Exp $
37 #include "hammer_util.h"
40 * Allocate big-blocks using our poor-man's volume->vol_free_off.
41 * We are bootstrapping the freemap itself and cannot update it yet.
44 bootstrap_bigblock(struct volume_info
*volume
)
46 hammer_off_t result_offset
;
48 assert_volume_offset(volume
);
49 result_offset
= volume
->vol_free_off
;
51 volume
->vol_free_off
+= HAMMER_BIGBLOCK_SIZE
;
53 return(result_offset
);
57 * Allocate a big-block for zone-3 for UNDO/REDO FIFO.
60 alloc_undo_bigblock(struct volume_info
*volume
)
62 hammer_blockmap_t freemap
;
63 struct buffer_info
*buffer1
= NULL
;
64 struct buffer_info
*buffer2
= NULL
;
65 hammer_blockmap_layer1_t layer1
;
66 hammer_blockmap_layer2_t layer2
;
67 hammer_off_t layer1_offset
;
68 hammer_off_t layer2_offset
;
69 hammer_off_t result_offset
;
71 /* Only root volume needs formatting */
72 assert(volume
->vol_no
== HAMMER_ROOT_VOLNO
);
74 result_offset
= bootstrap_bigblock(volume
);
75 freemap
= &volume
->ondisk
->vol0_blockmap
[HAMMER_ZONE_FREEMAP_INDEX
];
80 layer1_offset
= freemap
->phys_offset
+
81 HAMMER_BLOCKMAP_LAYER1_OFFSET(result_offset
);
82 layer1
= get_buffer_data(layer1_offset
, &buffer1
, 0);
83 assert(layer1
->phys_offset
!= HAMMER_BLOCKMAP_UNAVAIL
);
84 --layer1
->blocks_free
;
85 hammer_crc_set_layer1(layer1
);
86 buffer1
->cache
.modified
= 1;
89 * Dive layer 2, each entry represents a big-block.
91 layer2_offset
= layer1
->phys_offset
+
92 HAMMER_BLOCKMAP_LAYER2_OFFSET(result_offset
);
93 layer2
= get_buffer_data(layer2_offset
, &buffer2
, 0);
94 assert(layer2
->zone
== 0);
95 layer2
->zone
= HAMMER_ZONE_UNDO_INDEX
;
96 layer2
->append_off
= HAMMER_BIGBLOCK_SIZE
;
97 layer2
->bytes_free
= 0;
98 hammer_crc_set_layer2(layer2
);
99 buffer2
->cache
.modified
= 1;
101 --volume
->ondisk
->vol0_stat_freebigblocks
;
106 return(result_offset
);
110 * Allocate a chunk of data out of a blockmap. This is a simplified
111 * version which uses next_offset as a simple allocation iterator.
114 alloc_blockmap(int zone
, int bytes
, hammer_off_t
*result_offp
,
115 struct buffer_info
**bufferp
)
117 struct volume_info
*volume
;
118 hammer_blockmap_t blockmap
;
119 hammer_blockmap_t freemap
;
120 struct buffer_info
*buffer1
= NULL
;
121 struct buffer_info
*buffer2
= NULL
;
122 hammer_blockmap_layer1_t layer1
;
123 hammer_blockmap_layer2_t layer2
;
124 hammer_off_t tmp_offset
;
125 hammer_off_t layer1_offset
;
126 hammer_off_t layer2_offset
;
127 hammer_off_t block_offset
;
130 volume
= get_root_volume();
132 blockmap
= &volume
->ondisk
->vol0_blockmap
[zone
];
133 freemap
= &volume
->ondisk
->vol0_blockmap
[HAMMER_ZONE_FREEMAP_INDEX
];
134 assert(HAMMER_ZONE_DECODE(blockmap
->next_offset
) == zone
);
137 * Alignment and buffer-boundary issues. If the allocation would
138 * cross a buffer boundary we have to skip to the next buffer.
140 bytes
= HAMMER_DATA_DOALIGN(bytes
);
141 assert(bytes
> 0 && bytes
<= HAMMER_BUFSIZE
); /* not HAMMER_XBUFSIZE */
142 assert(hammer_is_zone2_mapped_index(zone
));
145 assert(blockmap
->next_offset
!= HAMMER_ZONE_ENCODE(zone
+ 1, 0));
147 tmp_offset
= blockmap
->next_offset
+ bytes
- 1;
148 if ((blockmap
->next_offset
^ tmp_offset
) & ~HAMMER_BUFMASK64
) {
149 blockmap
->next_offset
= tmp_offset
& ~HAMMER_BUFMASK64
;
151 block_offset
= blockmap
->next_offset
& HAMMER_BIGBLOCK_MASK
;
156 layer1_offset
= freemap
->phys_offset
+
157 HAMMER_BLOCKMAP_LAYER1_OFFSET(blockmap
->next_offset
);
158 layer1
= get_buffer_data(layer1_offset
, &buffer1
, 0);
159 assert(layer1
->phys_offset
!= HAMMER_BLOCKMAP_UNAVAIL
);
160 assert(!(block_offset
== 0 && layer1
->blocks_free
== 0));
163 * Dive layer 2, each entry represents a big-block.
165 layer2_offset
= layer1
->phys_offset
+
166 HAMMER_BLOCKMAP_LAYER2_OFFSET(blockmap
->next_offset
);
167 layer2
= get_buffer_data(layer2_offset
, &buffer2
, 0);
169 if (layer2
->zone
== HAMMER_ZONE_UNAVAIL_INDEX
) {
170 fprintf(stderr
, "alloc_blockmap: layer2 ran out of space!\n");
175 * If we are entering a new big-block assign ownership to our
176 * zone. If the big-block is owned by another zone skip it.
178 if (layer2
->zone
== 0) {
179 --layer1
->blocks_free
;
180 hammer_crc_set_layer1(layer1
);
182 --volume
->ondisk
->vol0_stat_freebigblocks
;
183 assert(layer2
->bytes_free
== HAMMER_BIGBLOCK_SIZE
);
184 assert(layer2
->append_off
== 0);
186 if (layer2
->zone
!= zone
) {
187 blockmap
->next_offset
=
188 HAMMER_ZONE_LAYER2_NEXT_OFFSET(blockmap
->next_offset
);
192 assert(layer2
->append_off
== block_offset
);
193 layer2
->bytes_free
-= bytes
;
194 *result_offp
= blockmap
->next_offset
;
195 blockmap
->next_offset
+= bytes
;
196 layer2
->append_off
= (int)blockmap
->next_offset
& HAMMER_BIGBLOCK_MASK
;
197 hammer_crc_set_layer2(layer2
);
199 ptr
= get_buffer_data(*result_offp
, bufferp
, 0);
200 (*bufferp
)->cache
.modified
= 1;
202 buffer1
->cache
.modified
= 1;
203 buffer2
->cache
.modified
= 1;
211 blockmap_lookup(hammer_off_t zone_offset
,
212 hammer_blockmap_layer1_t save_layer1
,
213 hammer_blockmap_layer2_t save_layer2
,
216 struct volume_info
*root_volume
= NULL
;
217 hammer_volume_ondisk_t ondisk
;
218 hammer_blockmap_t blockmap
;
219 hammer_blockmap_t freemap
;
220 hammer_blockmap_layer1_t layer1
;
221 hammer_blockmap_layer2_t layer2
;
222 struct buffer_info
*buffer1
= NULL
;
223 struct buffer_info
*buffer2
= NULL
;
224 hammer_off_t layer1_offset
;
225 hammer_off_t layer2_offset
;
226 hammer_off_t result_offset
;
231 bzero(save_layer1
, sizeof(*save_layer1
));
233 bzero(save_layer2
, sizeof(*save_layer2
));
235 zone
= HAMMER_ZONE_DECODE(zone_offset
);
237 if (zone
<= HAMMER_ZONE_RAW_VOLUME_INDEX
)
239 if (zone
>= HAMMER_MAX_ZONES
)
242 result_offset
= HAMMER_OFF_BAD
;
246 root_volume
= get_root_volume();
247 ondisk
= root_volume
->ondisk
;
248 blockmap
= &ondisk
->vol0_blockmap
[zone
];
250 if (zone
== HAMMER_ZONE_RAW_BUFFER_INDEX
) {
251 result_offset
= zone_offset
;
252 } else if (zone
== HAMMER_ZONE_UNDO_INDEX
) {
253 if (zone_offset
>= blockmap
->alloc_offset
) {
255 result_offset
= HAMMER_OFF_BAD
;
258 result_offset
= hammer_xlate_to_undo(ondisk
, zone_offset
);
260 result_offset
= hammer_xlate_to_zone2(zone_offset
);
264 * The blockmap should match the requested zone (else the volume
267 if (HAMMER_ZONE_FREEMAP_INDEX
!= zone
&&
268 HAMMER_ZONE_DECODE(blockmap
->alloc_offset
) != zone
) {
274 * Validate that the big-block is assigned to the zone. Also
275 * assign save_layer{1,2}.
278 freemap
= &ondisk
->vol0_blockmap
[HAMMER_ZONE_FREEMAP_INDEX
];
282 layer1_offset
= freemap
->phys_offset
+
283 HAMMER_BLOCKMAP_LAYER1_OFFSET(result_offset
);
284 layer1
= get_buffer_data(layer1_offset
, &buffer1
, 0);
285 if (layer1
== NULL
) {
289 if (layer1
->phys_offset
== HAMMER_BLOCKMAP_UNAVAIL
) {
295 *save_layer1
= *layer1
;
298 * Dive layer 2, each entry represents a big-block.
300 layer2_offset
= layer1
->phys_offset
+
301 HAMMER_BLOCKMAP_LAYER2_OFFSET(result_offset
);
302 layer2
= get_buffer_data(layer2_offset
, &buffer2
, 0);
304 if (layer2
== NULL
) {
308 if (layer2
->zone
!= zone
) {
313 *save_layer2
= *layer2
;
322 return(result_offset
);