]>
Commit | Line | Data |
---|---|---|
298800ca SH |
1 | /* |
2 | * QEMU Enhanced Disk Format Table I/O | |
3 | * | |
4 | * Copyright IBM, Corp. 2010 | |
5 | * | |
6 | * Authors: | |
7 | * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> | |
8 | * Anthony Liguori <aliguori@us.ibm.com> | |
9 | * | |
10 | * This work is licensed under the terms of the GNU LGPL, version 2 or later. | |
11 | * See the COPYING.LIB file in the top-level directory. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include "trace.h" | |
16 | #include "qemu_socket.h" /* for EINPROGRESS on Windows */ | |
17 | #include "qed.h" | |
18 | ||
19 | typedef struct { | |
20 | GenericCB gencb; | |
21 | BDRVQEDState *s; | |
22 | QEDTable *table; | |
23 | ||
24 | struct iovec iov; | |
25 | QEMUIOVector qiov; | |
26 | } QEDReadTableCB; | |
27 | ||
28 | static void qed_read_table_cb(void *opaque, int ret) | |
29 | { | |
30 | QEDReadTableCB *read_table_cb = opaque; | |
31 | QEDTable *table = read_table_cb->table; | |
32 | int noffsets = read_table_cb->iov.iov_len / sizeof(uint64_t); | |
33 | int i; | |
34 | ||
35 | /* Handle I/O error */ | |
36 | if (ret) { | |
37 | goto out; | |
38 | } | |
39 | ||
40 | /* Byteswap offsets */ | |
41 | for (i = 0; i < noffsets; i++) { | |
42 | table->offsets[i] = le64_to_cpu(table->offsets[i]); | |
43 | } | |
44 | ||
45 | out: | |
46 | /* Completion */ | |
47 | trace_qed_read_table_cb(read_table_cb->s, read_table_cb->table, ret); | |
48 | gencb_complete(&read_table_cb->gencb, ret); | |
49 | } | |
50 | ||
51 | static void qed_read_table(BDRVQEDState *s, uint64_t offset, QEDTable *table, | |
52 | BlockDriverCompletionFunc *cb, void *opaque) | |
53 | { | |
54 | QEDReadTableCB *read_table_cb = gencb_alloc(sizeof(*read_table_cb), | |
55 | cb, opaque); | |
56 | QEMUIOVector *qiov = &read_table_cb->qiov; | |
57 | BlockDriverAIOCB *aiocb; | |
58 | ||
59 | trace_qed_read_table(s, offset, table); | |
60 | ||
61 | read_table_cb->s = s; | |
62 | read_table_cb->table = table; | |
63 | read_table_cb->iov.iov_base = table->offsets, | |
64 | read_table_cb->iov.iov_len = s->header.cluster_size * s->header.table_size, | |
65 | ||
66 | qemu_iovec_init_external(qiov, &read_table_cb->iov, 1); | |
67 | aiocb = bdrv_aio_readv(s->bs->file, offset / BDRV_SECTOR_SIZE, qiov, | |
68 | read_table_cb->iov.iov_len / BDRV_SECTOR_SIZE, | |
69 | qed_read_table_cb, read_table_cb); | |
70 | if (!aiocb) { | |
71 | qed_read_table_cb(read_table_cb, -EIO); | |
72 | } | |
73 | } | |
74 | ||
75 | typedef struct { | |
76 | GenericCB gencb; | |
77 | BDRVQEDState *s; | |
78 | QEDTable *orig_table; | |
79 | QEDTable *table; | |
80 | bool flush; /* flush after write? */ | |
81 | ||
82 | struct iovec iov; | |
83 | QEMUIOVector qiov; | |
84 | } QEDWriteTableCB; | |
85 | ||
86 | static void qed_write_table_cb(void *opaque, int ret) | |
87 | { | |
88 | QEDWriteTableCB *write_table_cb = opaque; | |
89 | ||
90 | trace_qed_write_table_cb(write_table_cb->s, | |
91 | write_table_cb->orig_table, | |
92 | write_table_cb->flush, | |
93 | ret); | |
94 | ||
95 | if (ret) { | |
96 | goto out; | |
97 | } | |
98 | ||
99 | if (write_table_cb->flush) { | |
100 | /* We still need to flush first */ | |
101 | write_table_cb->flush = false; | |
102 | bdrv_aio_flush(write_table_cb->s->bs, qed_write_table_cb, | |
103 | write_table_cb); | |
104 | return; | |
105 | } | |
106 | ||
107 | out: | |
108 | qemu_vfree(write_table_cb->table); | |
109 | gencb_complete(&write_table_cb->gencb, ret); | |
110 | return; | |
111 | } | |
112 | ||
113 | /** | |
114 | * Write out an updated part or all of a table | |
115 | * | |
116 | * @s: QED state | |
117 | * @offset: Offset of table in image file, in bytes | |
118 | * @table: Table | |
119 | * @index: Index of first element | |
120 | * @n: Number of elements | |
121 | * @flush: Whether or not to sync to disk | |
122 | * @cb: Completion function | |
123 | * @opaque: Argument for completion function | |
124 | */ | |
125 | static void qed_write_table(BDRVQEDState *s, uint64_t offset, QEDTable *table, | |
126 | unsigned int index, unsigned int n, bool flush, | |
127 | BlockDriverCompletionFunc *cb, void *opaque) | |
128 | { | |
129 | QEDWriteTableCB *write_table_cb; | |
130 | BlockDriverAIOCB *aiocb; | |
131 | unsigned int sector_mask = BDRV_SECTOR_SIZE / sizeof(uint64_t) - 1; | |
132 | unsigned int start, end, i; | |
133 | size_t len_bytes; | |
134 | ||
135 | trace_qed_write_table(s, offset, table, index, n); | |
136 | ||
137 | /* Calculate indices of the first and one after last elements */ | |
138 | start = index & ~sector_mask; | |
139 | end = (index + n + sector_mask) & ~sector_mask; | |
140 | ||
141 | len_bytes = (end - start) * sizeof(uint64_t); | |
142 | ||
143 | write_table_cb = gencb_alloc(sizeof(*write_table_cb), cb, opaque); | |
144 | write_table_cb->s = s; | |
145 | write_table_cb->orig_table = table; | |
146 | write_table_cb->flush = flush; | |
147 | write_table_cb->table = qemu_blockalign(s->bs, len_bytes); | |
148 | write_table_cb->iov.iov_base = write_table_cb->table->offsets; | |
149 | write_table_cb->iov.iov_len = len_bytes; | |
150 | qemu_iovec_init_external(&write_table_cb->qiov, &write_table_cb->iov, 1); | |
151 | ||
152 | /* Byteswap table */ | |
153 | for (i = start; i < end; i++) { | |
154 | uint64_t le_offset = cpu_to_le64(table->offsets[i]); | |
155 | write_table_cb->table->offsets[i - start] = le_offset; | |
156 | } | |
157 | ||
158 | /* Adjust for offset into table */ | |
159 | offset += start * sizeof(uint64_t); | |
160 | ||
161 | aiocb = bdrv_aio_writev(s->bs->file, offset / BDRV_SECTOR_SIZE, | |
162 | &write_table_cb->qiov, | |
163 | write_table_cb->iov.iov_len / BDRV_SECTOR_SIZE, | |
164 | qed_write_table_cb, write_table_cb); | |
165 | if (!aiocb) { | |
166 | qed_write_table_cb(write_table_cb, -EIO); | |
167 | } | |
168 | } | |
169 | ||
170 | /** | |
171 | * Propagate return value from async callback | |
172 | */ | |
173 | static void qed_sync_cb(void *opaque, int ret) | |
174 | { | |
175 | *(int *)opaque = ret; | |
176 | } | |
177 | ||
178 | int qed_read_l1_table_sync(BDRVQEDState *s) | |
179 | { | |
180 | int ret = -EINPROGRESS; | |
181 | ||
298800ca SH |
182 | qed_read_table(s, s->header.l1_table_offset, |
183 | s->l1_table, qed_sync_cb, &ret); | |
184 | while (ret == -EINPROGRESS) { | |
185 | qemu_aio_wait(); | |
186 | } | |
187 | ||
298800ca SH |
188 | return ret; |
189 | } | |
190 | ||
191 | void qed_write_l1_table(BDRVQEDState *s, unsigned int index, unsigned int n, | |
192 | BlockDriverCompletionFunc *cb, void *opaque) | |
193 | { | |
194 | BLKDBG_EVENT(s->bs->file, BLKDBG_L1_UPDATE); | |
195 | qed_write_table(s, s->header.l1_table_offset, | |
196 | s->l1_table, index, n, false, cb, opaque); | |
197 | } | |
198 | ||
199 | int qed_write_l1_table_sync(BDRVQEDState *s, unsigned int index, | |
200 | unsigned int n) | |
201 | { | |
202 | int ret = -EINPROGRESS; | |
203 | ||
298800ca SH |
204 | qed_write_l1_table(s, index, n, qed_sync_cb, &ret); |
205 | while (ret == -EINPROGRESS) { | |
206 | qemu_aio_wait(); | |
207 | } | |
208 | ||
298800ca SH |
209 | return ret; |
210 | } | |
211 | ||
212 | typedef struct { | |
213 | GenericCB gencb; | |
214 | BDRVQEDState *s; | |
215 | uint64_t l2_offset; | |
216 | QEDRequest *request; | |
217 | } QEDReadL2TableCB; | |
218 | ||
219 | static void qed_read_l2_table_cb(void *opaque, int ret) | |
220 | { | |
221 | QEDReadL2TableCB *read_l2_table_cb = opaque; | |
222 | QEDRequest *request = read_l2_table_cb->request; | |
223 | BDRVQEDState *s = read_l2_table_cb->s; | |
224 | CachedL2Table *l2_table = request->l2_table; | |
e4fc8781 | 225 | uint64_t l2_offset = read_l2_table_cb->l2_offset; |
298800ca SH |
226 | |
227 | if (ret) { | |
228 | /* can't trust loaded L2 table anymore */ | |
229 | qed_unref_l2_cache_entry(l2_table); | |
230 | request->l2_table = NULL; | |
231 | } else { | |
e4fc8781 | 232 | l2_table->offset = l2_offset; |
298800ca SH |
233 | |
234 | qed_commit_l2_cache_entry(&s->l2_cache, l2_table); | |
235 | ||
236 | /* This is guaranteed to succeed because we just committed the entry | |
237 | * to the cache. | |
238 | */ | |
e4fc8781 | 239 | request->l2_table = qed_find_l2_cache_entry(&s->l2_cache, l2_offset); |
298800ca SH |
240 | assert(request->l2_table != NULL); |
241 | } | |
242 | ||
243 | gencb_complete(&read_l2_table_cb->gencb, ret); | |
244 | } | |
245 | ||
246 | void qed_read_l2_table(BDRVQEDState *s, QEDRequest *request, uint64_t offset, | |
247 | BlockDriverCompletionFunc *cb, void *opaque) | |
248 | { | |
249 | QEDReadL2TableCB *read_l2_table_cb; | |
250 | ||
251 | qed_unref_l2_cache_entry(request->l2_table); | |
252 | ||
253 | /* Check for cached L2 entry */ | |
254 | request->l2_table = qed_find_l2_cache_entry(&s->l2_cache, offset); | |
255 | if (request->l2_table) { | |
256 | cb(opaque, 0); | |
257 | return; | |
258 | } | |
259 | ||
260 | request->l2_table = qed_alloc_l2_cache_entry(&s->l2_cache); | |
261 | request->l2_table->table = qed_alloc_table(s); | |
262 | ||
263 | read_l2_table_cb = gencb_alloc(sizeof(*read_l2_table_cb), cb, opaque); | |
264 | read_l2_table_cb->s = s; | |
265 | read_l2_table_cb->l2_offset = offset; | |
266 | read_l2_table_cb->request = request; | |
267 | ||
268 | BLKDBG_EVENT(s->bs->file, BLKDBG_L2_LOAD); | |
269 | qed_read_table(s, offset, request->l2_table->table, | |
270 | qed_read_l2_table_cb, read_l2_table_cb); | |
271 | } | |
272 | ||
273 | int qed_read_l2_table_sync(BDRVQEDState *s, QEDRequest *request, uint64_t offset) | |
274 | { | |
275 | int ret = -EINPROGRESS; | |
276 | ||
298800ca SH |
277 | qed_read_l2_table(s, request, offset, qed_sync_cb, &ret); |
278 | while (ret == -EINPROGRESS) { | |
279 | qemu_aio_wait(); | |
280 | } | |
281 | ||
298800ca SH |
282 | return ret; |
283 | } | |
284 | ||
285 | void qed_write_l2_table(BDRVQEDState *s, QEDRequest *request, | |
286 | unsigned int index, unsigned int n, bool flush, | |
287 | BlockDriverCompletionFunc *cb, void *opaque) | |
288 | { | |
289 | BLKDBG_EVENT(s->bs->file, BLKDBG_L2_UPDATE); | |
290 | qed_write_table(s, request->l2_table->offset, | |
291 | request->l2_table->table, index, n, flush, cb, opaque); | |
292 | } | |
293 | ||
294 | int qed_write_l2_table_sync(BDRVQEDState *s, QEDRequest *request, | |
295 | unsigned int index, unsigned int n, bool flush) | |
296 | { | |
297 | int ret = -EINPROGRESS; | |
298 | ||
298800ca SH |
299 | qed_write_l2_table(s, request, index, n, flush, qed_sync_cb, &ret); |
300 | while (ret == -EINPROGRESS) { | |
301 | qemu_aio_wait(); | |
302 | } | |
303 | ||
298800ca SH |
304 | return ret; |
305 | } |