Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 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" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 16 | #include "qemu/sockets.h" /* for EINPROGRESS on Windows */ |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 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; |
Zhi Yong Wu | 23e9a39 | 2011-11-01 16:04:32 +0800 | [diff] [blame] | 32 | int noffsets = read_table_cb->qiov.size / sizeof(uint64_t); |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 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; |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 57 | |
| 58 | trace_qed_read_table(s, offset, table); |
| 59 | |
| 60 | read_table_cb->s = s; |
| 61 | read_table_cb->table = table; |
| 62 | read_table_cb->iov.iov_base = table->offsets, |
| 63 | read_table_cb->iov.iov_len = s->header.cluster_size * s->header.table_size, |
| 64 | |
| 65 | qemu_iovec_init_external(qiov, &read_table_cb->iov, 1); |
Paolo Bonzini | ad54ae8 | 2011-11-30 09:12:30 +0100 | [diff] [blame] | 66 | bdrv_aio_readv(s->bs->file, offset / BDRV_SECTOR_SIZE, qiov, |
| 67 | qiov->size / BDRV_SECTOR_SIZE, |
| 68 | qed_read_table_cb, read_table_cb); |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 69 | } |
| 70 | |
| 71 | typedef struct { |
| 72 | GenericCB gencb; |
| 73 | BDRVQEDState *s; |
| 74 | QEDTable *orig_table; |
| 75 | QEDTable *table; |
| 76 | bool flush; /* flush after write? */ |
| 77 | |
| 78 | struct iovec iov; |
| 79 | QEMUIOVector qiov; |
| 80 | } QEDWriteTableCB; |
| 81 | |
| 82 | static void qed_write_table_cb(void *opaque, int ret) |
| 83 | { |
| 84 | QEDWriteTableCB *write_table_cb = opaque; |
| 85 | |
| 86 | trace_qed_write_table_cb(write_table_cb->s, |
| 87 | write_table_cb->orig_table, |
| 88 | write_table_cb->flush, |
| 89 | ret); |
| 90 | |
| 91 | if (ret) { |
| 92 | goto out; |
| 93 | } |
| 94 | |
| 95 | if (write_table_cb->flush) { |
| 96 | /* We still need to flush first */ |
| 97 | write_table_cb->flush = false; |
| 98 | bdrv_aio_flush(write_table_cb->s->bs, qed_write_table_cb, |
| 99 | write_table_cb); |
| 100 | return; |
| 101 | } |
| 102 | |
| 103 | out: |
| 104 | qemu_vfree(write_table_cb->table); |
| 105 | gencb_complete(&write_table_cb->gencb, ret); |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | /** |
| 109 | * Write out an updated part or all of a table |
| 110 | * |
| 111 | * @s: QED state |
| 112 | * @offset: Offset of table in image file, in bytes |
| 113 | * @table: Table |
| 114 | * @index: Index of first element |
| 115 | * @n: Number of elements |
| 116 | * @flush: Whether or not to sync to disk |
| 117 | * @cb: Completion function |
| 118 | * @opaque: Argument for completion function |
| 119 | */ |
| 120 | static void qed_write_table(BDRVQEDState *s, uint64_t offset, QEDTable *table, |
| 121 | unsigned int index, unsigned int n, bool flush, |
| 122 | BlockDriverCompletionFunc *cb, void *opaque) |
| 123 | { |
| 124 | QEDWriteTableCB *write_table_cb; |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 125 | unsigned int sector_mask = BDRV_SECTOR_SIZE / sizeof(uint64_t) - 1; |
| 126 | unsigned int start, end, i; |
| 127 | size_t len_bytes; |
| 128 | |
| 129 | trace_qed_write_table(s, offset, table, index, n); |
| 130 | |
| 131 | /* Calculate indices of the first and one after last elements */ |
| 132 | start = index & ~sector_mask; |
| 133 | end = (index + n + sector_mask) & ~sector_mask; |
| 134 | |
| 135 | len_bytes = (end - start) * sizeof(uint64_t); |
| 136 | |
| 137 | write_table_cb = gencb_alloc(sizeof(*write_table_cb), cb, opaque); |
| 138 | write_table_cb->s = s; |
| 139 | write_table_cb->orig_table = table; |
| 140 | write_table_cb->flush = flush; |
| 141 | write_table_cb->table = qemu_blockalign(s->bs, len_bytes); |
| 142 | write_table_cb->iov.iov_base = write_table_cb->table->offsets; |
| 143 | write_table_cb->iov.iov_len = len_bytes; |
| 144 | qemu_iovec_init_external(&write_table_cb->qiov, &write_table_cb->iov, 1); |
| 145 | |
| 146 | /* Byteswap table */ |
| 147 | for (i = start; i < end; i++) { |
| 148 | uint64_t le_offset = cpu_to_le64(table->offsets[i]); |
| 149 | write_table_cb->table->offsets[i - start] = le_offset; |
| 150 | } |
| 151 | |
| 152 | /* Adjust for offset into table */ |
| 153 | offset += start * sizeof(uint64_t); |
| 154 | |
Paolo Bonzini | ad54ae8 | 2011-11-30 09:12:30 +0100 | [diff] [blame] | 155 | bdrv_aio_writev(s->bs->file, offset / BDRV_SECTOR_SIZE, |
| 156 | &write_table_cb->qiov, |
| 157 | write_table_cb->qiov.size / BDRV_SECTOR_SIZE, |
| 158 | qed_write_table_cb, write_table_cb); |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | /** |
| 162 | * Propagate return value from async callback |
| 163 | */ |
| 164 | static void qed_sync_cb(void *opaque, int ret) |
| 165 | { |
| 166 | *(int *)opaque = ret; |
| 167 | } |
| 168 | |
| 169 | int qed_read_l1_table_sync(BDRVQEDState *s) |
| 170 | { |
| 171 | int ret = -EINPROGRESS; |
| 172 | |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 173 | qed_read_table(s, s->header.l1_table_offset, |
| 174 | s->l1_table, qed_sync_cb, &ret); |
| 175 | while (ret == -EINPROGRESS) { |
| 176 | qemu_aio_wait(); |
| 177 | } |
| 178 | |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 179 | return ret; |
| 180 | } |
| 181 | |
| 182 | void qed_write_l1_table(BDRVQEDState *s, unsigned int index, unsigned int n, |
| 183 | BlockDriverCompletionFunc *cb, void *opaque) |
| 184 | { |
| 185 | BLKDBG_EVENT(s->bs->file, BLKDBG_L1_UPDATE); |
| 186 | qed_write_table(s, s->header.l1_table_offset, |
| 187 | s->l1_table, index, n, false, cb, opaque); |
| 188 | } |
| 189 | |
| 190 | int qed_write_l1_table_sync(BDRVQEDState *s, unsigned int index, |
| 191 | unsigned int n) |
| 192 | { |
| 193 | int ret = -EINPROGRESS; |
| 194 | |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 195 | qed_write_l1_table(s, index, n, qed_sync_cb, &ret); |
| 196 | while (ret == -EINPROGRESS) { |
| 197 | qemu_aio_wait(); |
| 198 | } |
| 199 | |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 200 | return ret; |
| 201 | } |
| 202 | |
| 203 | typedef struct { |
| 204 | GenericCB gencb; |
| 205 | BDRVQEDState *s; |
| 206 | uint64_t l2_offset; |
| 207 | QEDRequest *request; |
| 208 | } QEDReadL2TableCB; |
| 209 | |
| 210 | static void qed_read_l2_table_cb(void *opaque, int ret) |
| 211 | { |
| 212 | QEDReadL2TableCB *read_l2_table_cb = opaque; |
| 213 | QEDRequest *request = read_l2_table_cb->request; |
| 214 | BDRVQEDState *s = read_l2_table_cb->s; |
| 215 | CachedL2Table *l2_table = request->l2_table; |
Stefan Hajnoczi | e4fc878 | 2011-09-30 11:39:11 +0100 | [diff] [blame] | 216 | uint64_t l2_offset = read_l2_table_cb->l2_offset; |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 217 | |
| 218 | if (ret) { |
| 219 | /* can't trust loaded L2 table anymore */ |
| 220 | qed_unref_l2_cache_entry(l2_table); |
| 221 | request->l2_table = NULL; |
| 222 | } else { |
Stefan Hajnoczi | e4fc878 | 2011-09-30 11:39:11 +0100 | [diff] [blame] | 223 | l2_table->offset = l2_offset; |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 224 | |
| 225 | qed_commit_l2_cache_entry(&s->l2_cache, l2_table); |
| 226 | |
| 227 | /* This is guaranteed to succeed because we just committed the entry |
| 228 | * to the cache. |
| 229 | */ |
Stefan Hajnoczi | e4fc878 | 2011-09-30 11:39:11 +0100 | [diff] [blame] | 230 | request->l2_table = qed_find_l2_cache_entry(&s->l2_cache, l2_offset); |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 231 | assert(request->l2_table != NULL); |
| 232 | } |
| 233 | |
| 234 | gencb_complete(&read_l2_table_cb->gencb, ret); |
| 235 | } |
| 236 | |
| 237 | void qed_read_l2_table(BDRVQEDState *s, QEDRequest *request, uint64_t offset, |
| 238 | BlockDriverCompletionFunc *cb, void *opaque) |
| 239 | { |
| 240 | QEDReadL2TableCB *read_l2_table_cb; |
| 241 | |
| 242 | qed_unref_l2_cache_entry(request->l2_table); |
| 243 | |
| 244 | /* Check for cached L2 entry */ |
| 245 | request->l2_table = qed_find_l2_cache_entry(&s->l2_cache, offset); |
| 246 | if (request->l2_table) { |
| 247 | cb(opaque, 0); |
| 248 | return; |
| 249 | } |
| 250 | |
| 251 | request->l2_table = qed_alloc_l2_cache_entry(&s->l2_cache); |
| 252 | request->l2_table->table = qed_alloc_table(s); |
| 253 | |
| 254 | read_l2_table_cb = gencb_alloc(sizeof(*read_l2_table_cb), cb, opaque); |
| 255 | read_l2_table_cb->s = s; |
| 256 | read_l2_table_cb->l2_offset = offset; |
| 257 | read_l2_table_cb->request = request; |
| 258 | |
| 259 | BLKDBG_EVENT(s->bs->file, BLKDBG_L2_LOAD); |
| 260 | qed_read_table(s, offset, request->l2_table->table, |
| 261 | qed_read_l2_table_cb, read_l2_table_cb); |
| 262 | } |
| 263 | |
| 264 | int qed_read_l2_table_sync(BDRVQEDState *s, QEDRequest *request, uint64_t offset) |
| 265 | { |
| 266 | int ret = -EINPROGRESS; |
| 267 | |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 268 | qed_read_l2_table(s, request, offset, qed_sync_cb, &ret); |
| 269 | while (ret == -EINPROGRESS) { |
| 270 | qemu_aio_wait(); |
| 271 | } |
| 272 | |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 273 | return ret; |
| 274 | } |
| 275 | |
| 276 | void qed_write_l2_table(BDRVQEDState *s, QEDRequest *request, |
| 277 | unsigned int index, unsigned int n, bool flush, |
| 278 | BlockDriverCompletionFunc *cb, void *opaque) |
| 279 | { |
| 280 | BLKDBG_EVENT(s->bs->file, BLKDBG_L2_UPDATE); |
| 281 | qed_write_table(s, request->l2_table->offset, |
| 282 | request->l2_table->table, index, n, flush, cb, opaque); |
| 283 | } |
| 284 | |
| 285 | int qed_write_l2_table_sync(BDRVQEDState *s, QEDRequest *request, |
| 286 | unsigned int index, unsigned int n, bool flush) |
| 287 | { |
| 288 | int ret = -EINPROGRESS; |
| 289 | |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 290 | qed_write_l2_table(s, request, index, n, flush, qed_sync_cb, &ret); |
| 291 | while (ret == -EINPROGRESS) { |
| 292 | qemu_aio_wait(); |
| 293 | } |
| 294 | |
Stefan Hajnoczi | 298800c | 2010-12-06 16:08:01 +0000 | [diff] [blame] | 295 | return ret; |
| 296 | } |