Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 1 | /* |
| 2 | * QEMU backup |
| 3 | * |
| 4 | * Copyright (C) 2013 Proxmox Server Solutions |
| 5 | * |
| 6 | * Authors: |
| 7 | * Dietmar Maurer (dietmar@proxmox.com) |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 10 | * See the COPYING file in the top-level directory. |
| 11 | * |
| 12 | */ |
| 13 | |
Peter Maydell | 80c71a2 | 2016-01-18 18:01:42 +0000 | [diff] [blame] | 14 | #include "qemu/osdep.h" |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 15 | |
| 16 | #include "trace.h" |
| 17 | #include "block/block.h" |
| 18 | #include "block/block_int.h" |
John Snow | c87621e | 2016-10-27 12:07:00 -0400 | [diff] [blame] | 19 | #include "block/blockjob_int.h" |
Wen Congyang | 49d3e82 | 2016-07-27 15:01:43 +0800 | [diff] [blame] | 20 | #include "block/block_backup.h" |
Markus Armbruster | da34e65 | 2016-03-14 09:01:28 +0100 | [diff] [blame] | 21 | #include "qapi/error.h" |
Markus Armbruster | cc7a8ea | 2015-03-17 17:22:46 +0100 | [diff] [blame] | 22 | #include "qapi/qmp/qerror.h" |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 23 | #include "qemu/ratelimit.h" |
Veronia Bahaa | f348b6d | 2016-03-20 19:16:19 +0200 | [diff] [blame] | 24 | #include "qemu/cutils.h" |
Max Reitz | 373340b | 2015-10-19 17:53:22 +0200 | [diff] [blame] | 25 | #include "sysemu/block-backend.h" |
Fam Zheng | b2f5646 | 2016-03-08 12:44:52 +0800 | [diff] [blame] | 26 | #include "qemu/bitmap.h" |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 27 | |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 28 | #define BACKUP_CLUSTER_SIZE_DEFAULT (1 << 16) |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 29 | #define SLICE_TIME 100000000ULL /* ns */ |
| 30 | |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 31 | typedef struct BackupBlockJob { |
| 32 | BlockJob common; |
Kevin Wolf | 5c438bc | 2016-04-14 13:09:53 +0200 | [diff] [blame] | 33 | BlockBackend *target; |
John Snow | 4b80ab2 | 2015-06-04 20:20:34 -0400 | [diff] [blame] | 34 | /* bitmap for sync=incremental */ |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 35 | BdrvDirtyBitmap *sync_bitmap; |
Ian Main | fc5d3f8 | 2013-07-26 11:39:04 -0700 | [diff] [blame] | 36 | MirrorSyncMode sync_mode; |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 37 | RateLimit limit; |
| 38 | BlockdevOnError on_source_error; |
| 39 | BlockdevOnError on_target_error; |
| 40 | CoRwlock flush_rwlock; |
| 41 | uint64_t sectors_read; |
Fam Zheng | b2f5646 | 2016-03-08 12:44:52 +0800 | [diff] [blame] | 42 | unsigned long *done_bitmap; |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 43 | int64_t cluster_size; |
Pavel Butsykin | 13b9414 | 2016-07-22 11:17:52 +0300 | [diff] [blame] | 44 | bool compress; |
John Snow | 12b3e52 | 2016-01-26 18:54:58 -0500 | [diff] [blame] | 45 | NotifierWithReturn before_write; |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 46 | QLIST_HEAD(, CowRequest) inflight_reqs; |
| 47 | } BackupBlockJob; |
| 48 | |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 49 | /* Size of a cluster in sectors, instead of bytes. */ |
| 50 | static inline int64_t cluster_size_sectors(BackupBlockJob *job) |
| 51 | { |
| 52 | return job->cluster_size / BDRV_SECTOR_SIZE; |
| 53 | } |
| 54 | |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 55 | /* See if in-flight requests overlap and wait for them to complete */ |
| 56 | static void coroutine_fn wait_for_overlapping_requests(BackupBlockJob *job, |
| 57 | int64_t start, |
| 58 | int64_t end) |
| 59 | { |
| 60 | CowRequest *req; |
| 61 | bool retry; |
| 62 | |
| 63 | do { |
| 64 | retry = false; |
| 65 | QLIST_FOREACH(req, &job->inflight_reqs, list) { |
| 66 | if (end > req->start && start < req->end) { |
Paolo Bonzini | 1ace7ce | 2017-02-13 19:12:43 +0100 | [diff] [blame] | 67 | qemu_co_queue_wait(&req->wait_queue, NULL); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 68 | retry = true; |
| 69 | break; |
| 70 | } |
| 71 | } |
| 72 | } while (retry); |
| 73 | } |
| 74 | |
| 75 | /* Keep track of an in-flight request */ |
| 76 | static void cow_request_begin(CowRequest *req, BackupBlockJob *job, |
| 77 | int64_t start, int64_t end) |
| 78 | { |
| 79 | req->start = start; |
| 80 | req->end = end; |
| 81 | qemu_co_queue_init(&req->wait_queue); |
| 82 | QLIST_INSERT_HEAD(&job->inflight_reqs, req, list); |
| 83 | } |
| 84 | |
| 85 | /* Forget about a completed request */ |
| 86 | static void cow_request_end(CowRequest *req) |
| 87 | { |
| 88 | QLIST_REMOVE(req, list); |
| 89 | qemu_co_queue_restart_all(&req->wait_queue); |
| 90 | } |
| 91 | |
Kevin Wolf | 8543c27 | 2016-04-14 15:56:02 +0200 | [diff] [blame] | 92 | static int coroutine_fn backup_do_cow(BackupBlockJob *job, |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 93 | int64_t sector_num, int nb_sectors, |
Wen Congyang | 06c3916 | 2015-09-08 11:28:33 +0800 | [diff] [blame] | 94 | bool *error_is_read, |
| 95 | bool is_write_notifier) |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 96 | { |
Kevin Wolf | 5c438bc | 2016-04-14 13:09:53 +0200 | [diff] [blame] | 97 | BlockBackend *blk = job->common.blk; |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 98 | CowRequest cow_request; |
| 99 | struct iovec iov; |
| 100 | QEMUIOVector bounce_qiov; |
| 101 | void *bounce_buffer = NULL; |
| 102 | int ret = 0; |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 103 | int64_t sectors_per_cluster = cluster_size_sectors(job); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 104 | int64_t start, end; |
| 105 | int n; |
| 106 | |
| 107 | qemu_co_rwlock_rdlock(&job->flush_rwlock); |
| 108 | |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 109 | start = sector_num / sectors_per_cluster; |
| 110 | end = DIV_ROUND_UP(sector_num + nb_sectors, sectors_per_cluster); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 111 | |
| 112 | trace_backup_do_cow_enter(job, start, sector_num, nb_sectors); |
| 113 | |
| 114 | wait_for_overlapping_requests(job, start, end); |
| 115 | cow_request_begin(&cow_request, job, start, end); |
| 116 | |
| 117 | for (; start < end; start++) { |
Fam Zheng | b2f5646 | 2016-03-08 12:44:52 +0800 | [diff] [blame] | 118 | if (test_bit(start, job->done_bitmap)) { |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 119 | trace_backup_do_cow_skip(job, start); |
| 120 | continue; /* already copied */ |
| 121 | } |
| 122 | |
| 123 | trace_backup_do_cow_process(job, start); |
| 124 | |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 125 | n = MIN(sectors_per_cluster, |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 126 | job->common.len / BDRV_SECTOR_SIZE - |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 127 | start * sectors_per_cluster); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 128 | |
| 129 | if (!bounce_buffer) { |
Kevin Wolf | 5c438bc | 2016-04-14 13:09:53 +0200 | [diff] [blame] | 130 | bounce_buffer = blk_blockalign(blk, job->cluster_size); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 131 | } |
| 132 | iov.iov_base = bounce_buffer; |
| 133 | iov.iov_len = n * BDRV_SECTOR_SIZE; |
| 134 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); |
| 135 | |
Kevin Wolf | 5c438bc | 2016-04-14 13:09:53 +0200 | [diff] [blame] | 136 | ret = blk_co_preadv(blk, start * job->cluster_size, |
| 137 | bounce_qiov.size, &bounce_qiov, |
| 138 | is_write_notifier ? BDRV_REQ_NO_SERIALISING : 0); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 139 | if (ret < 0) { |
| 140 | trace_backup_do_cow_read_fail(job, start, ret); |
| 141 | if (error_is_read) { |
| 142 | *error_is_read = true; |
| 143 | } |
| 144 | goto out; |
| 145 | } |
| 146 | |
| 147 | if (buffer_is_zero(iov.iov_base, iov.iov_len)) { |
Kevin Wolf | 5c438bc | 2016-04-14 13:09:53 +0200 | [diff] [blame] | 148 | ret = blk_co_pwrite_zeroes(job->target, start * job->cluster_size, |
| 149 | bounce_qiov.size, BDRV_REQ_MAY_UNMAP); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 150 | } else { |
Kevin Wolf | 5c438bc | 2016-04-14 13:09:53 +0200 | [diff] [blame] | 151 | ret = blk_co_pwritev(job->target, start * job->cluster_size, |
Pavel Butsykin | 13b9414 | 2016-07-22 11:17:52 +0300 | [diff] [blame] | 152 | bounce_qiov.size, &bounce_qiov, |
| 153 | job->compress ? BDRV_REQ_WRITE_COMPRESSED : 0); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 154 | } |
| 155 | if (ret < 0) { |
| 156 | trace_backup_do_cow_write_fail(job, start, ret); |
| 157 | if (error_is_read) { |
| 158 | *error_is_read = false; |
| 159 | } |
| 160 | goto out; |
| 161 | } |
| 162 | |
Fam Zheng | b2f5646 | 2016-03-08 12:44:52 +0800 | [diff] [blame] | 163 | set_bit(start, job->done_bitmap); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 164 | |
| 165 | /* Publish progress, guest I/O counts as progress too. Note that the |
| 166 | * offset field is an opaque progress value, it is not a disk offset. |
| 167 | */ |
| 168 | job->sectors_read += n; |
| 169 | job->common.offset += n * BDRV_SECTOR_SIZE; |
| 170 | } |
| 171 | |
| 172 | out: |
| 173 | if (bounce_buffer) { |
| 174 | qemu_vfree(bounce_buffer); |
| 175 | } |
| 176 | |
| 177 | cow_request_end(&cow_request); |
| 178 | |
| 179 | trace_backup_do_cow_return(job, sector_num, nb_sectors, ret); |
| 180 | |
| 181 | qemu_co_rwlock_unlock(&job->flush_rwlock); |
| 182 | |
| 183 | return ret; |
| 184 | } |
| 185 | |
| 186 | static int coroutine_fn backup_before_write_notify( |
| 187 | NotifierWithReturn *notifier, |
| 188 | void *opaque) |
| 189 | { |
John Snow | 12b3e52 | 2016-01-26 18:54:58 -0500 | [diff] [blame] | 190 | BackupBlockJob *job = container_of(notifier, BackupBlockJob, before_write); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 191 | BdrvTrackedRequest *req = opaque; |
Kevin Wolf | 793ed47 | 2013-12-03 15:31:25 +0100 | [diff] [blame] | 192 | int64_t sector_num = req->offset >> BDRV_SECTOR_BITS; |
| 193 | int nb_sectors = req->bytes >> BDRV_SECTOR_BITS; |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 194 | |
Kevin Wolf | 5c438bc | 2016-04-14 13:09:53 +0200 | [diff] [blame] | 195 | assert(req->bs == blk_bs(job->common.blk)); |
Kevin Wolf | 793ed47 | 2013-12-03 15:31:25 +0100 | [diff] [blame] | 196 | assert((req->offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
| 197 | assert((req->bytes & (BDRV_SECTOR_SIZE - 1)) == 0); |
| 198 | |
Kevin Wolf | 8543c27 | 2016-04-14 15:56:02 +0200 | [diff] [blame] | 199 | return backup_do_cow(job, sector_num, nb_sectors, NULL, true); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 200 | } |
| 201 | |
| 202 | static void backup_set_speed(BlockJob *job, int64_t speed, Error **errp) |
| 203 | { |
| 204 | BackupBlockJob *s = container_of(job, BackupBlockJob, common); |
| 205 | |
| 206 | if (speed < 0) { |
Markus Armbruster | c6bd8c7 | 2015-03-17 11:54:50 +0100 | [diff] [blame] | 207 | error_setg(errp, QERR_INVALID_PARAMETER, "speed"); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 208 | return; |
| 209 | } |
| 210 | ratelimit_set_speed(&s->limit, speed / BDRV_SECTOR_SIZE, SLICE_TIME); |
| 211 | } |
| 212 | |
Fam Zheng | b976ea3 | 2015-11-05 18:13:10 -0500 | [diff] [blame] | 213 | static void backup_cleanup_sync_bitmap(BackupBlockJob *job, int ret) |
| 214 | { |
| 215 | BdrvDirtyBitmap *bm; |
Kevin Wolf | 5c438bc | 2016-04-14 13:09:53 +0200 | [diff] [blame] | 216 | BlockDriverState *bs = blk_bs(job->common.blk); |
Fam Zheng | b976ea3 | 2015-11-05 18:13:10 -0500 | [diff] [blame] | 217 | |
| 218 | if (ret < 0 || block_job_is_cancelled(&job->common)) { |
| 219 | /* Merge the successor back into the parent, delete nothing. */ |
| 220 | bm = bdrv_reclaim_dirty_bitmap(bs, job->sync_bitmap, NULL); |
| 221 | assert(bm); |
| 222 | } else { |
| 223 | /* Everything is fine, delete this bitmap and install the backup. */ |
| 224 | bm = bdrv_dirty_bitmap_abdicate(bs, job->sync_bitmap, NULL); |
| 225 | assert(bm); |
| 226 | } |
| 227 | } |
| 228 | |
John Snow | c347b2c | 2015-11-05 18:13:16 -0500 | [diff] [blame] | 229 | static void backup_commit(BlockJob *job) |
| 230 | { |
| 231 | BackupBlockJob *s = container_of(job, BackupBlockJob, common); |
| 232 | if (s->sync_bitmap) { |
| 233 | backup_cleanup_sync_bitmap(s, 0); |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | static void backup_abort(BlockJob *job) |
| 238 | { |
| 239 | BackupBlockJob *s = container_of(job, BackupBlockJob, common); |
| 240 | if (s->sync_bitmap) { |
| 241 | backup_cleanup_sync_bitmap(s, -1); |
| 242 | } |
| 243 | } |
| 244 | |
John Snow | e8a40bf | 2016-11-08 01:50:35 -0500 | [diff] [blame] | 245 | static void backup_clean(BlockJob *job) |
| 246 | { |
| 247 | BackupBlockJob *s = container_of(job, BackupBlockJob, common); |
| 248 | assert(s->target); |
| 249 | blk_unref(s->target); |
| 250 | s->target = NULL; |
| 251 | } |
| 252 | |
Stefan Hajnoczi | 5ab4b69 | 2016-06-16 17:56:29 +0100 | [diff] [blame] | 253 | static void backup_attached_aio_context(BlockJob *job, AioContext *aio_context) |
| 254 | { |
| 255 | BackupBlockJob *s = container_of(job, BackupBlockJob, common); |
| 256 | |
| 257 | blk_set_aio_context(s->target, aio_context); |
| 258 | } |
| 259 | |
Wen Congyang | 49d3e82 | 2016-07-27 15:01:43 +0800 | [diff] [blame] | 260 | void backup_do_checkpoint(BlockJob *job, Error **errp) |
| 261 | { |
| 262 | BackupBlockJob *backup_job = container_of(job, BackupBlockJob, common); |
| 263 | int64_t len; |
| 264 | |
| 265 | assert(job->driver->job_type == BLOCK_JOB_TYPE_BACKUP); |
| 266 | |
| 267 | if (backup_job->sync_mode != MIRROR_SYNC_MODE_NONE) { |
| 268 | error_setg(errp, "The backup job only supports block checkpoint in" |
| 269 | " sync=none mode"); |
| 270 | return; |
| 271 | } |
| 272 | |
| 273 | len = DIV_ROUND_UP(backup_job->common.len, backup_job->cluster_size); |
| 274 | bitmap_zero(backup_job->done_bitmap, len); |
| 275 | } |
| 276 | |
Changlong Xie | a8bbee0 | 2016-07-27 15:01:44 +0800 | [diff] [blame] | 277 | void backup_wait_for_overlapping_requests(BlockJob *job, int64_t sector_num, |
| 278 | int nb_sectors) |
| 279 | { |
| 280 | BackupBlockJob *backup_job = container_of(job, BackupBlockJob, common); |
| 281 | int64_t sectors_per_cluster = cluster_size_sectors(backup_job); |
| 282 | int64_t start, end; |
| 283 | |
| 284 | assert(job->driver->job_type == BLOCK_JOB_TYPE_BACKUP); |
| 285 | |
| 286 | start = sector_num / sectors_per_cluster; |
| 287 | end = DIV_ROUND_UP(sector_num + nb_sectors, sectors_per_cluster); |
| 288 | wait_for_overlapping_requests(backup_job, start, end); |
| 289 | } |
| 290 | |
| 291 | void backup_cow_request_begin(CowRequest *req, BlockJob *job, |
| 292 | int64_t sector_num, |
| 293 | int nb_sectors) |
| 294 | { |
| 295 | BackupBlockJob *backup_job = container_of(job, BackupBlockJob, common); |
| 296 | int64_t sectors_per_cluster = cluster_size_sectors(backup_job); |
| 297 | int64_t start, end; |
| 298 | |
| 299 | assert(job->driver->job_type == BLOCK_JOB_TYPE_BACKUP); |
| 300 | |
| 301 | start = sector_num / sectors_per_cluster; |
| 302 | end = DIV_ROUND_UP(sector_num + nb_sectors, sectors_per_cluster); |
| 303 | cow_request_begin(req, backup_job, start, end); |
| 304 | } |
| 305 | |
| 306 | void backup_cow_request_end(CowRequest *req) |
| 307 | { |
| 308 | cow_request_end(req); |
| 309 | } |
| 310 | |
Paolo Bonzini | bae8196 | 2016-10-27 12:48:50 +0200 | [diff] [blame] | 311 | static void backup_drain(BlockJob *job) |
| 312 | { |
| 313 | BackupBlockJob *s = container_of(job, BackupBlockJob, common); |
| 314 | |
| 315 | /* Need to keep a reference in case blk_drain triggers execution |
| 316 | * of backup_complete... |
| 317 | */ |
| 318 | if (s->target) { |
| 319 | BlockBackend *target = s->target; |
| 320 | blk_ref(target); |
| 321 | blk_drain(target); |
| 322 | blk_unref(target); |
| 323 | } |
| 324 | } |
| 325 | |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 326 | static BlockErrorAction backup_error_action(BackupBlockJob *job, |
| 327 | bool read, int error) |
| 328 | { |
| 329 | if (read) { |
Kevin Wolf | 81e254d | 2016-04-18 11:36:38 +0200 | [diff] [blame] | 330 | return block_job_error_action(&job->common, job->on_source_error, |
| 331 | true, error); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 332 | } else { |
Kevin Wolf | 81e254d | 2016-04-18 11:36:38 +0200 | [diff] [blame] | 333 | return block_job_error_action(&job->common, job->on_target_error, |
| 334 | false, error); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 335 | } |
| 336 | } |
| 337 | |
Stefan Hajnoczi | 761731b | 2014-10-21 12:03:56 +0100 | [diff] [blame] | 338 | typedef struct { |
| 339 | int ret; |
| 340 | } BackupCompleteData; |
| 341 | |
| 342 | static void backup_complete(BlockJob *job, void *opaque) |
| 343 | { |
Stefan Hajnoczi | 761731b | 2014-10-21 12:03:56 +0100 | [diff] [blame] | 344 | BackupCompleteData *data = opaque; |
| 345 | |
Stefan Hajnoczi | 761731b | 2014-10-21 12:03:56 +0100 | [diff] [blame] | 346 | block_job_completed(job, data->ret); |
| 347 | g_free(data); |
| 348 | } |
| 349 | |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 350 | static bool coroutine_fn yield_and_check(BackupBlockJob *job) |
| 351 | { |
| 352 | if (block_job_is_cancelled(&job->common)) { |
| 353 | return true; |
| 354 | } |
| 355 | |
| 356 | /* we need to yield so that bdrv_drain_all() returns. |
| 357 | * (without, VM does not reboot) |
| 358 | */ |
| 359 | if (job->common.speed) { |
| 360 | uint64_t delay_ns = ratelimit_calculate_delay(&job->limit, |
| 361 | job->sectors_read); |
| 362 | job->sectors_read = 0; |
| 363 | block_job_sleep_ns(&job->common, QEMU_CLOCK_REALTIME, delay_ns); |
| 364 | } else { |
| 365 | block_job_sleep_ns(&job->common, QEMU_CLOCK_REALTIME, 0); |
| 366 | } |
| 367 | |
| 368 | if (block_job_is_cancelled(&job->common)) { |
| 369 | return true; |
| 370 | } |
| 371 | |
| 372 | return false; |
| 373 | } |
| 374 | |
| 375 | static int coroutine_fn backup_run_incremental(BackupBlockJob *job) |
| 376 | { |
| 377 | bool error_is_read; |
| 378 | int ret = 0; |
| 379 | int clusters_per_iter; |
| 380 | uint32_t granularity; |
| 381 | int64_t sector; |
| 382 | int64_t cluster; |
| 383 | int64_t end; |
| 384 | int64_t last_cluster = -1; |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 385 | int64_t sectors_per_cluster = cluster_size_sectors(job); |
Fam Zheng | dc162c8 | 2016-10-13 17:58:21 -0400 | [diff] [blame] | 386 | BdrvDirtyBitmapIter *dbi; |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 387 | |
| 388 | granularity = bdrv_dirty_bitmap_granularity(job->sync_bitmap); |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 389 | clusters_per_iter = MAX((granularity / job->cluster_size), 1); |
Fam Zheng | dc162c8 | 2016-10-13 17:58:21 -0400 | [diff] [blame] | 390 | dbi = bdrv_dirty_iter_new(job->sync_bitmap, 0); |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 391 | |
| 392 | /* Find the next dirty sector(s) */ |
Fam Zheng | dc162c8 | 2016-10-13 17:58:21 -0400 | [diff] [blame] | 393 | while ((sector = bdrv_dirty_iter_next(dbi)) != -1) { |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 394 | cluster = sector / sectors_per_cluster; |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 395 | |
| 396 | /* Fake progress updates for any clusters we skipped */ |
| 397 | if (cluster != last_cluster + 1) { |
| 398 | job->common.offset += ((cluster - last_cluster - 1) * |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 399 | job->cluster_size); |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 400 | } |
| 401 | |
| 402 | for (end = cluster + clusters_per_iter; cluster < end; cluster++) { |
| 403 | do { |
| 404 | if (yield_and_check(job)) { |
Fam Zheng | dc162c8 | 2016-10-13 17:58:21 -0400 | [diff] [blame] | 405 | goto out; |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 406 | } |
Kevin Wolf | 8543c27 | 2016-04-14 15:56:02 +0200 | [diff] [blame] | 407 | ret = backup_do_cow(job, cluster * sectors_per_cluster, |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 408 | sectors_per_cluster, &error_is_read, |
Wen Congyang | 06c3916 | 2015-09-08 11:28:33 +0800 | [diff] [blame] | 409 | false); |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 410 | if ((ret < 0) && |
| 411 | backup_error_action(job, error_is_read, -ret) == |
| 412 | BLOCK_ERROR_ACTION_REPORT) { |
Fam Zheng | dc162c8 | 2016-10-13 17:58:21 -0400 | [diff] [blame] | 413 | goto out; |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 414 | } |
| 415 | } while (ret < 0); |
| 416 | } |
| 417 | |
| 418 | /* If the bitmap granularity is smaller than the backup granularity, |
| 419 | * we need to advance the iterator pointer to the next cluster. */ |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 420 | if (granularity < job->cluster_size) { |
Fam Zheng | dc162c8 | 2016-10-13 17:58:21 -0400 | [diff] [blame] | 421 | bdrv_set_dirty_iter(dbi, cluster * sectors_per_cluster); |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 422 | } |
| 423 | |
| 424 | last_cluster = cluster - 1; |
| 425 | } |
| 426 | |
| 427 | /* Play some final catchup with the progress meter */ |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 428 | end = DIV_ROUND_UP(job->common.len, job->cluster_size); |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 429 | if (last_cluster + 1 < end) { |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 430 | job->common.offset += ((end - last_cluster - 1) * job->cluster_size); |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 431 | } |
| 432 | |
Fam Zheng | dc162c8 | 2016-10-13 17:58:21 -0400 | [diff] [blame] | 433 | out: |
| 434 | bdrv_dirty_iter_free(dbi); |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 435 | return ret; |
| 436 | } |
| 437 | |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 438 | static void coroutine_fn backup_run(void *opaque) |
| 439 | { |
| 440 | BackupBlockJob *job = opaque; |
Stefan Hajnoczi | 761731b | 2014-10-21 12:03:56 +0100 | [diff] [blame] | 441 | BackupCompleteData *data; |
Kevin Wolf | 5c438bc | 2016-04-14 13:09:53 +0200 | [diff] [blame] | 442 | BlockDriverState *bs = blk_bs(job->common.blk); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 443 | int64_t start, end; |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 444 | int64_t sectors_per_cluster = cluster_size_sectors(job); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 445 | int ret = 0; |
| 446 | |
| 447 | QLIST_INIT(&job->inflight_reqs); |
| 448 | qemu_co_rwlock_init(&job->flush_rwlock); |
| 449 | |
| 450 | start = 0; |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 451 | end = DIV_ROUND_UP(job->common.len, job->cluster_size); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 452 | |
Fam Zheng | b2f5646 | 2016-03-08 12:44:52 +0800 | [diff] [blame] | 453 | job->done_bitmap = bitmap_new(end); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 454 | |
John Snow | 12b3e52 | 2016-01-26 18:54:58 -0500 | [diff] [blame] | 455 | job->before_write.notify = backup_before_write_notify; |
| 456 | bdrv_add_before_write_notifier(bs, &job->before_write); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 457 | |
Ian Main | fc5d3f8 | 2013-07-26 11:39:04 -0700 | [diff] [blame] | 458 | if (job->sync_mode == MIRROR_SYNC_MODE_NONE) { |
| 459 | while (!block_job_is_cancelled(&job->common)) { |
| 460 | /* Yield until the job is cancelled. We just let our before_write |
| 461 | * notify callback service CoW requests. */ |
Stefan Hajnoczi | 5ab4b69 | 2016-06-16 17:56:29 +0100 | [diff] [blame] | 462 | block_job_yield(&job->common); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 463 | } |
John Snow | 4b80ab2 | 2015-06-04 20:20:34 -0400 | [diff] [blame] | 464 | } else if (job->sync_mode == MIRROR_SYNC_MODE_INCREMENTAL) { |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 465 | ret = backup_run_incremental(job); |
Ian Main | fc5d3f8 | 2013-07-26 11:39:04 -0700 | [diff] [blame] | 466 | } else { |
| 467 | /* Both FULL and TOP SYNC_MODE's require copying.. */ |
| 468 | for (; start < end; start++) { |
| 469 | bool error_is_read; |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 470 | if (yield_and_check(job)) { |
Ian Main | fc5d3f8 | 2013-07-26 11:39:04 -0700 | [diff] [blame] | 471 | break; |
| 472 | } |
| 473 | |
| 474 | if (job->sync_mode == MIRROR_SYNC_MODE_TOP) { |
| 475 | int i, n; |
| 476 | int alloced = 0; |
| 477 | |
| 478 | /* Check to see if these blocks are already in the |
| 479 | * backing file. */ |
| 480 | |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 481 | for (i = 0; i < sectors_per_cluster;) { |
Paolo Bonzini | bdad13b | 2013-09-04 19:00:22 +0200 | [diff] [blame] | 482 | /* bdrv_is_allocated() only returns true/false based |
Stefan Weil | 4c293dc | 2013-08-18 19:40:06 +0200 | [diff] [blame] | 483 | * on the first set of sectors it comes across that |
Ian Main | fc5d3f8 | 2013-07-26 11:39:04 -0700 | [diff] [blame] | 484 | * are are all in the same state. |
| 485 | * For that reason we must verify each sector in the |
| 486 | * backup cluster length. We end up copying more than |
| 487 | * needed but at some point that is always the case. */ |
| 488 | alloced = |
Paolo Bonzini | bdad13b | 2013-09-04 19:00:22 +0200 | [diff] [blame] | 489 | bdrv_is_allocated(bs, |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 490 | start * sectors_per_cluster + i, |
| 491 | sectors_per_cluster - i, &n); |
Ian Main | fc5d3f8 | 2013-07-26 11:39:04 -0700 | [diff] [blame] | 492 | i += n; |
| 493 | |
Kevin Wolf | d40593d | 2014-07-07 16:38:58 +0200 | [diff] [blame] | 494 | if (alloced == 1 || n == 0) { |
Ian Main | fc5d3f8 | 2013-07-26 11:39:04 -0700 | [diff] [blame] | 495 | break; |
| 496 | } |
| 497 | } |
| 498 | |
| 499 | /* If the above loop never found any sectors that are in |
| 500 | * the topmost image, skip this backup. */ |
| 501 | if (alloced == 0) { |
| 502 | continue; |
| 503 | } |
| 504 | } |
| 505 | /* FULL sync mode we copy the whole drive. */ |
Kevin Wolf | 8543c27 | 2016-04-14 15:56:02 +0200 | [diff] [blame] | 506 | ret = backup_do_cow(job, start * sectors_per_cluster, |
John Snow | 16096a4 | 2016-02-25 15:58:29 -0500 | [diff] [blame] | 507 | sectors_per_cluster, &error_is_read, false); |
Ian Main | fc5d3f8 | 2013-07-26 11:39:04 -0700 | [diff] [blame] | 508 | if (ret < 0) { |
| 509 | /* Depending on error action, fail now or retry cluster */ |
| 510 | BlockErrorAction action = |
| 511 | backup_error_action(job, error_is_read, -ret); |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 512 | if (action == BLOCK_ERROR_ACTION_REPORT) { |
Ian Main | fc5d3f8 | 2013-07-26 11:39:04 -0700 | [diff] [blame] | 513 | break; |
| 514 | } else { |
| 515 | start--; |
| 516 | continue; |
| 517 | } |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 518 | } |
| 519 | } |
| 520 | } |
| 521 | |
John Snow | 12b3e52 | 2016-01-26 18:54:58 -0500 | [diff] [blame] | 522 | notifier_with_return_remove(&job->before_write); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 523 | |
| 524 | /* wait until pending backup_do_cow() calls have completed */ |
| 525 | qemu_co_rwlock_wrlock(&job->flush_rwlock); |
| 526 | qemu_co_rwlock_unlock(&job->flush_rwlock); |
Fam Zheng | b2f5646 | 2016-03-08 12:44:52 +0800 | [diff] [blame] | 527 | g_free(job->done_bitmap); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 528 | |
Stefan Hajnoczi | 761731b | 2014-10-21 12:03:56 +0100 | [diff] [blame] | 529 | data = g_malloc(sizeof(*data)); |
| 530 | data->ret = ret; |
| 531 | block_job_defer_to_main_loop(&job->common, backup_complete, data); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 532 | } |
| 533 | |
John Snow | a7815a7 | 2016-11-08 01:50:36 -0500 | [diff] [blame] | 534 | static const BlockJobDriver backup_job_driver = { |
| 535 | .instance_size = sizeof(BackupBlockJob), |
| 536 | .job_type = BLOCK_JOB_TYPE_BACKUP, |
| 537 | .start = backup_run, |
| 538 | .set_speed = backup_set_speed, |
| 539 | .commit = backup_commit, |
| 540 | .abort = backup_abort, |
| 541 | .clean = backup_clean, |
| 542 | .attached_aio_context = backup_attached_aio_context, |
| 543 | .drain = backup_drain, |
| 544 | }; |
| 545 | |
John Snow | 111049a | 2016-11-08 01:50:38 -0500 | [diff] [blame] | 546 | BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs, |
Alberto Garcia | 70559d4 | 2016-07-05 17:28:58 +0300 | [diff] [blame] | 547 | BlockDriverState *target, int64_t speed, |
| 548 | MirrorSyncMode sync_mode, BdrvDirtyBitmap *sync_bitmap, |
Pavel Butsykin | 13b9414 | 2016-07-22 11:17:52 +0300 | [diff] [blame] | 549 | bool compress, |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 550 | BlockdevOnError on_source_error, |
| 551 | BlockdevOnError on_target_error, |
John Snow | 47970df | 2016-10-27 12:06:57 -0400 | [diff] [blame] | 552 | int creation_flags, |
Markus Armbruster | 097310b | 2014-10-07 13:59:15 +0200 | [diff] [blame] | 553 | BlockCompletionFunc *cb, void *opaque, |
John Snow | 78f51fd | 2015-11-05 18:13:17 -0500 | [diff] [blame] | 554 | BlockJobTxn *txn, Error **errp) |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 555 | { |
| 556 | int64_t len; |
John Snow | 4c9bca7 | 2016-02-25 15:58:30 -0500 | [diff] [blame] | 557 | BlockDriverInfo bdi; |
Kevin Wolf | 91ab688 | 2016-04-14 12:59:55 +0200 | [diff] [blame] | 558 | BackupBlockJob *job = NULL; |
John Snow | 4c9bca7 | 2016-02-25 15:58:30 -0500 | [diff] [blame] | 559 | int ret; |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 560 | |
| 561 | assert(bs); |
| 562 | assert(target); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 563 | |
Fam Zheng | c29c1dd | 2014-12-18 18:37:05 +0800 | [diff] [blame] | 564 | if (bs == target) { |
| 565 | error_setg(errp, "Source and target cannot be the same"); |
John Snow | 111049a | 2016-11-08 01:50:38 -0500 | [diff] [blame] | 566 | return NULL; |
Fam Zheng | c29c1dd | 2014-12-18 18:37:05 +0800 | [diff] [blame] | 567 | } |
| 568 | |
Fam Zheng | c29c1dd | 2014-12-18 18:37:05 +0800 | [diff] [blame] | 569 | if (!bdrv_is_inserted(bs)) { |
| 570 | error_setg(errp, "Device is not inserted: %s", |
| 571 | bdrv_get_device_name(bs)); |
John Snow | 111049a | 2016-11-08 01:50:38 -0500 | [diff] [blame] | 572 | return NULL; |
Fam Zheng | c29c1dd | 2014-12-18 18:37:05 +0800 | [diff] [blame] | 573 | } |
| 574 | |
| 575 | if (!bdrv_is_inserted(target)) { |
| 576 | error_setg(errp, "Device is not inserted: %s", |
| 577 | bdrv_get_device_name(target)); |
John Snow | 111049a | 2016-11-08 01:50:38 -0500 | [diff] [blame] | 578 | return NULL; |
Fam Zheng | c29c1dd | 2014-12-18 18:37:05 +0800 | [diff] [blame] | 579 | } |
| 580 | |
Pavel Butsykin | 13b9414 | 2016-07-22 11:17:52 +0300 | [diff] [blame] | 581 | if (compress && target->drv->bdrv_co_pwritev_compressed == NULL) { |
| 582 | error_setg(errp, "Compression is not supported for this drive %s", |
| 583 | bdrv_get_device_name(target)); |
John Snow | 111049a | 2016-11-08 01:50:38 -0500 | [diff] [blame] | 584 | return NULL; |
Pavel Butsykin | 13b9414 | 2016-07-22 11:17:52 +0300 | [diff] [blame] | 585 | } |
| 586 | |
Fam Zheng | c29c1dd | 2014-12-18 18:37:05 +0800 | [diff] [blame] | 587 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { |
John Snow | 111049a | 2016-11-08 01:50:38 -0500 | [diff] [blame] | 588 | return NULL; |
Fam Zheng | c29c1dd | 2014-12-18 18:37:05 +0800 | [diff] [blame] | 589 | } |
| 590 | |
| 591 | if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_BACKUP_TARGET, errp)) { |
John Snow | 111049a | 2016-11-08 01:50:38 -0500 | [diff] [blame] | 592 | return NULL; |
Fam Zheng | c29c1dd | 2014-12-18 18:37:05 +0800 | [diff] [blame] | 593 | } |
| 594 | |
John Snow | 4b80ab2 | 2015-06-04 20:20:34 -0400 | [diff] [blame] | 595 | if (sync_mode == MIRROR_SYNC_MODE_INCREMENTAL) { |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 596 | if (!sync_bitmap) { |
| 597 | error_setg(errp, "must provide a valid bitmap name for " |
John Snow | 4b80ab2 | 2015-06-04 20:20:34 -0400 | [diff] [blame] | 598 | "\"incremental\" sync mode"); |
John Snow | 111049a | 2016-11-08 01:50:38 -0500 | [diff] [blame] | 599 | return NULL; |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 600 | } |
| 601 | |
| 602 | /* Create a new bitmap, and freeze/disable this one. */ |
| 603 | if (bdrv_dirty_bitmap_create_successor(bs, sync_bitmap, errp) < 0) { |
John Snow | 111049a | 2016-11-08 01:50:38 -0500 | [diff] [blame] | 604 | return NULL; |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 605 | } |
| 606 | } else if (sync_bitmap) { |
| 607 | error_setg(errp, |
| 608 | "a sync_bitmap was provided to backup_run, " |
| 609 | "but received an incompatible sync_mode (%s)", |
| 610 | MirrorSyncMode_lookup[sync_mode]); |
John Snow | 111049a | 2016-11-08 01:50:38 -0500 | [diff] [blame] | 611 | return NULL; |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 612 | } |
| 613 | |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 614 | len = bdrv_getlength(bs); |
| 615 | if (len < 0) { |
| 616 | error_setg_errno(errp, -len, "unable to get length for '%s'", |
| 617 | bdrv_get_device_name(bs)); |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 618 | goto error; |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 619 | } |
| 620 | |
Alberto Garcia | 70559d4 | 2016-07-05 17:28:58 +0300 | [diff] [blame] | 621 | job = block_job_create(job_id, &backup_job_driver, bs, speed, |
John Snow | 47970df | 2016-10-27 12:06:57 -0400 | [diff] [blame] | 622 | creation_flags, cb, opaque, errp); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 623 | if (!job) { |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 624 | goto error; |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 625 | } |
| 626 | |
Kevin Wolf | 5c438bc | 2016-04-14 13:09:53 +0200 | [diff] [blame] | 627 | job->target = blk_new(); |
| 628 | blk_insert_bs(job->target, target); |
| 629 | |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 630 | job->on_source_error = on_source_error; |
| 631 | job->on_target_error = on_target_error; |
Ian Main | fc5d3f8 | 2013-07-26 11:39:04 -0700 | [diff] [blame] | 632 | job->sync_mode = sync_mode; |
John Snow | 4b80ab2 | 2015-06-04 20:20:34 -0400 | [diff] [blame] | 633 | job->sync_bitmap = sync_mode == MIRROR_SYNC_MODE_INCREMENTAL ? |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 634 | sync_bitmap : NULL; |
Pavel Butsykin | 13b9414 | 2016-07-22 11:17:52 +0300 | [diff] [blame] | 635 | job->compress = compress; |
John Snow | 4c9bca7 | 2016-02-25 15:58:30 -0500 | [diff] [blame] | 636 | |
| 637 | /* If there is no backing file on the target, we cannot rely on COW if our |
| 638 | * backup cluster size is smaller than the target cluster size. Even for |
| 639 | * targets with a backing file, try to avoid COW if possible. */ |
Kevin Wolf | 5c438bc | 2016-04-14 13:09:53 +0200 | [diff] [blame] | 640 | ret = bdrv_get_info(target, &bdi); |
John Snow | 4c9bca7 | 2016-02-25 15:58:30 -0500 | [diff] [blame] | 641 | if (ret < 0 && !target->backing) { |
| 642 | error_setg_errno(errp, -ret, |
| 643 | "Couldn't determine the cluster size of the target image, " |
| 644 | "which has no backing file"); |
| 645 | error_append_hint(errp, |
| 646 | "Aborting, since this may create an unusable destination image\n"); |
| 647 | goto error; |
| 648 | } else if (ret < 0 && target->backing) { |
| 649 | /* Not fatal; just trudge on ahead. */ |
| 650 | job->cluster_size = BACKUP_CLUSTER_SIZE_DEFAULT; |
| 651 | } else { |
| 652 | job->cluster_size = MAX(BACKUP_CLUSTER_SIZE_DEFAULT, bdi.cluster_size); |
| 653 | } |
| 654 | |
Alberto Garcia | b7340d0 | 2016-10-28 10:08:06 +0300 | [diff] [blame] | 655 | block_job_add_bdrv(&job->common, target); |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 656 | job->common.len = len; |
John Snow | 78f51fd | 2015-11-05 18:13:17 -0500 | [diff] [blame] | 657 | block_job_txn_add_job(txn, &job->common); |
John Snow | 111049a | 2016-11-08 01:50:38 -0500 | [diff] [blame] | 658 | |
| 659 | return &job->common; |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 660 | |
| 661 | error: |
| 662 | if (sync_bitmap) { |
| 663 | bdrv_reclaim_dirty_bitmap(bs, sync_bitmap, NULL); |
| 664 | } |
Kevin Wolf | 91ab688 | 2016-04-14 12:59:55 +0200 | [diff] [blame] | 665 | if (job) { |
John Snow | e8a40bf | 2016-11-08 01:50:35 -0500 | [diff] [blame] | 666 | backup_clean(&job->common); |
Kevin Wolf | 91ab688 | 2016-04-14 12:59:55 +0200 | [diff] [blame] | 667 | block_job_unref(&job->common); |
| 668 | } |
John Snow | 111049a | 2016-11-08 01:50:38 -0500 | [diff] [blame] | 669 | |
| 670 | return NULL; |
Dietmar Maurer | 98d2c6f | 2013-06-24 17:13:11 +0200 | [diff] [blame] | 671 | } |