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| author | Ari Sundholm <ari@tuxera.com> | 2018-07-04 17:59:36 +0300 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2018-07-05 10:50:21 +0200 |
| commit | 1dce698ea85bb18f62e4c540d4db628bacfba6ba (patch) | |
| tree | 1806b6bba47728cc6ef53b87acd3b410cd1b7fb7 /block/blklogwrites.c | |
| parent | 0878b3c113145d4e01d65aadd4efaf097a3fda4b (diff) | |
| download | qemu-1dce698ea85bb18f62e4c540d4db628bacfba6ba.zip qemu-1dce698ea85bb18f62e4c540d4db628bacfba6ba.tar.gz qemu-1dce698ea85bb18f62e4c540d4db628bacfba6ba.tar.bz2 | |
block/blklogwrites: Add an option for the update interval of the log superblock
This is a way to ensure that the log superblock is periodically
updated. Before, this was only done on flush requests, which may
not be enough if the VM exits abnormally, omitting the final flush.
The default interval is 4096 write requests.
Signed-off-by: Ari Sundholm <ari@tuxera.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/blklogwrites.c')
| -rw-r--r-- | block/blklogwrites.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/block/blklogwrites.c b/block/blklogwrites.c index 56154e7..63bf6b3 100644 --- a/block/blklogwrites.c +++ b/block/blklogwrites.c @@ -55,6 +55,7 @@ typedef struct { uint32_t sectorbits; uint64_t cur_log_sector; uint64_t nr_entries; + uint64_t update_interval; } BDRVBlkLogWritesState; static QemuOptsList runtime_opts = { @@ -71,6 +72,11 @@ static QemuOptsList runtime_opts = { .type = QEMU_OPT_SIZE, .help = "Log sector size", }, + { + .name = "log-super-update-interval", + .type = QEMU_OPT_NUMBER, + .help = "Log superblock update interval (# of write requests)", + }, { /* end of list */ } }, }; @@ -234,6 +240,14 @@ static int blk_log_writes_open(BlockDriverState *bs, QDict *options, int flags, s->sectorsize = log_sector_size; s->sectorbits = blk_log_writes_log2(log_sector_size); + s->update_interval = qemu_opt_get_number(opts, "log-super-update-interval", + 4096); + if (!s->update_interval) { + ret = -EINVAL; + error_setg(errp, "Invalid log superblock update interval %"PRIu64, + s->update_interval); + goto fail_log; + } ret = 0; fail_log: @@ -360,8 +374,10 @@ static void coroutine_fn blk_log_writes_co_do_log(BlkLogWritesLogReq *lr) lr->zero_size, 0); } - /* Update super block on flush */ - if (lr->log_ret == 0 && lr->entry.flags & LOG_FLUSH_FLAG) { + /* Update super block on flush or every update interval */ + if (lr->log_ret == 0 && ((lr->entry.flags & LOG_FLUSH_FLAG) + || (s->nr_entries % s->update_interval == 0))) + { struct log_write_super super = { .magic = cpu_to_le64(WRITE_LOG_MAGIC), .version = cpu_to_le64(WRITE_LOG_VERSION), |