Commit 3ff2f67a authored by Evgeny Yakovlev's avatar Evgeny Yakovlev Committed by John Snow
Browse files

block: ignore flush requests when storage is clean 



Some guests (win2008 server for example) do a lot of unnecessary
flushing when underlying media has not changed. This adds additional
overhead on host when calling fsync/fdatasync.

This change introduces a write generation scheme in BlockDriverState.
Current write generation is checked against last flushed generation to
avoid unnessesary flushes.

The problem with excessive flushing was found by a performance test
which does parallel directory tree creation (from 2 processes).
Results improved from 0.424 loops/sec to 0.432 loops/sec.
Each loop creates 10^3 directories with 10 files in each.

This affected some blkdebug testcases that were expecting error logs from
failure-injected flushes which are now skipped entirely
(tests 026 071 089).

This also affects the performance of block jobs and thus BLOCK_JOB_READY
events for driver-mirror and active block-commit commands now arrives
faster, before QMP send successfully returns to caller (tests 141 144).

Signed-off-by: default avatarEvgeny Yakovlev <eyakovlev@virtuozzo.com>
Signed-off-by: default avatarDenis V. Lunev <den@openvz.org>
Reviewed-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Message-id: 1468870792-7411-5-git-send-email-den@openvz.org
CC: Kevin Wolf <kwolf@redhat.com>
CC: Max Reitz <mreitz@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Fam Zheng <famz@redhat.com>
CC: John Snow <jsnow@redhat.com>
Signed-off-by: default avatarJohn Snow <jsnow@redhat.com>
parent 2dd7e10d

block.c

+3 −0
Original line number Diff line number Diff line
@@ -234,6 +234,8 @@ BlockDriverState *bdrv_new(void) 
    bs->refcnt = 1;

    bs->aio_context = qemu_get_aio_context();



    qemu_co_queue_init(&bs->flush_queue);



    QTAILQ_INSERT_TAIL(&all_bdrv_states, bs, bs_list);



    return bs;
@@ -2472,6 +2474,7 @@ int bdrv_truncate(BlockDriverState *bs, int64_t offset) 
        ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);

        bdrv_dirty_bitmap_truncate(bs);

        bdrv_parent_cb_resize(bs);

        ++bs->write_gen;

    }

    return ret;

}

block/io.c

+21 −0
Original line number Diff line number Diff line
@@ -1303,6 +1303,7 @@ static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs, 
    }

    bdrv_debug_event(bs, BLKDBG_PWRITEV_DONE);



    ++bs->write_gen;

    bdrv_set_dirty(bs, start_sector, end_sector - start_sector);



    if (bs->wr_highest_offset < offset + bytes) {
@@ -2236,6 +2237,15 @@ int coroutine_fn bdrv_co_flush(BlockDriverState *bs) 


    tracked_request_begin(&req, bs, 0, 0, BDRV_TRACKED_FLUSH);



    int current_gen = bs->write_gen;



    /* Wait until any previous flushes are completed */

    while (bs->flush_started_gen != bs->flushed_gen) {

        qemu_co_queue_wait(&bs->flush_queue);

    }



    bs->flush_started_gen = current_gen;



    /* Write back all layers by calling one driver function */

    if (bs->drv->bdrv_co_flush) {

        ret = bs->drv->bdrv_co_flush(bs);
@@ -2256,6 +2266,11 @@ int coroutine_fn bdrv_co_flush(BlockDriverState *bs) 
        goto flush_parent;

    }



    /* Check if we really need to flush anything */

    if (bs->flushed_gen == current_gen) {

        goto flush_parent;

    }



    BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_DISK);

    if (bs->drv->bdrv_co_flush_to_disk) {

        ret = bs->drv->bdrv_co_flush_to_disk(bs);
@@ -2286,6 +2301,7 @@ int coroutine_fn bdrv_co_flush(BlockDriverState *bs) 
         */

        ret = 0;

    }



    if (ret < 0) {

        goto out;

    }
@@ -2296,6 +2312,10 @@ int coroutine_fn bdrv_co_flush(BlockDriverState *bs) 
flush_parent:

    ret = bs->file ? bdrv_co_flush(bs->file->bs) : 0;

out:

    /* Notify any pending flushes that we have completed */

    bs->flushed_gen = current_gen;

    qemu_co_queue_restart_all(&bs->flush_queue);



    tracked_request_end(&req);

    return ret;

}
@@ -2421,6 +2441,7 @@ int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, 
    }

    ret = 0;

out:

    ++bs->write_gen;

    bdrv_set_dirty(bs, req.offset >> BDRV_SECTOR_BITS,

                   req.bytes >> BDRV_SECTOR_BITS);

    tracked_request_end(&req);

include/block/block_int.h

+5 −0
Original line number Diff line number Diff line
@@ -439,6 +439,11 @@ struct BlockDriverState { 
    int copy_on_read; /* if nonzero, copy read backing sectors into image.

                         note this is a reference count */



    CoQueue flush_queue;            /* Serializing flush queue */

    unsigned int write_gen;         /* Current data generation */

    unsigned int flush_started_gen; /* Generation for which flush has started */

    unsigned int flushed_gen;       /* Flushed write generation */



    BlockDriver *drv; /* NULL means no media */

    void *opaque;

tests/qemu-iotests/026.out

+0 −50
Original line number Diff line number Diff line
@@ -14,7 +14,6 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: l1_update; errno: 5; imm: off; once: off; write

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error
@@ -23,7 +22,6 @@ This means waste of disk space, but no harm to data. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: l1_update; errno: 5; imm: off; once: off; write -b

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error
@@ -42,7 +40,6 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: l1_update; errno: 28; imm: off; once: off; write

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device
@@ -51,7 +48,6 @@ This means waste of disk space, but no harm to data. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: l1_update; errno: 28; imm: off; once: off; write -b

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device
@@ -78,11 +74,7 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
Event: l2_load; errno: 5; imm: off; once: off; write

wrote 131072/131072 bytes at offset 0

128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

read failed: Input/output error

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
@@ -90,11 +82,7 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
Event: l2_load; errno: 5; imm: off; once: off; write -b

wrote 131072/131072 bytes at offset 0

128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

read failed: Input/output error

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
@@ -118,11 +106,7 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
Event: l2_load; errno: 28; imm: off; once: off; write

wrote 131072/131072 bytes at offset 0

128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

read failed: No space left on device

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
@@ -130,11 +114,7 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
Event: l2_load; errno: 28; imm: off; once: off; write -b

wrote 131072/131072 bytes at offset 0

128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

read failed: No space left on device

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
@@ -306,14 +286,12 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: refblock_load; errno: 5; imm: off; once: off; write

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: refblock_load; errno: 5; imm: off; once: off; write -b

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.
@@ -330,14 +308,12 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: refblock_load; errno: 28; imm: off; once: off; write

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: refblock_load; errno: 28; imm: off; once: off; write -b

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.
@@ -354,14 +330,12 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: refblock_update_part; errno: 5; imm: off; once: off; write

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: refblock_update_part; errno: 5; imm: off; once: off; write -b

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.
@@ -378,14 +352,12 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: refblock_update_part; errno: 28; imm: off; once: off; write

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: refblock_update_part; errno: 28; imm: off; once: off; write -b

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.
@@ -402,14 +374,12 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: refblock_alloc; errno: 5; imm: off; once: off; write

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: refblock_alloc; errno: 5; imm: off; once: off; write -b

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.
@@ -426,14 +396,12 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: refblock_alloc; errno: 28; imm: off; once: off; write

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: refblock_alloc; errno: 28; imm: off; once: off; write -b

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.
@@ -450,15 +418,11 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: cluster_alloc; errno: 5; imm: off; once: off; write

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: cluster_alloc; errno: 5; imm: off; once: off; write -b

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
@@ -474,15 +438,11 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: cluster_alloc; errno: 28; imm: off; once: off; write

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: cluster_alloc; errno: 28; imm: off; once: off; write -b

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.
@@ -553,7 +513,6 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: refblock_alloc_write_blocks; errno: 28; imm: off; once: off; write

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device
@@ -562,7 +521,6 @@ This means waste of disk space, but no harm to data. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: refblock_alloc_write_blocks; errno: 28; imm: off; once: off; write -b

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device
@@ -581,7 +539,6 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: refblock_alloc_write_table; errno: 28; imm: off; once: off; write

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device
@@ -590,7 +547,6 @@ This means waste of disk space, but no harm to data. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: refblock_alloc_write_table; errno: 28; imm: off; once: off; write -b

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device
@@ -635,8 +591,6 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: l1_grow_alloc_table; errno: 5; imm: off; once: off

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
@@ -647,8 +601,6 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: l1_grow_alloc_table; errno: 28; imm: off; once: off

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
@@ -659,7 +611,6 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: l1_grow_write_table; errno: 5; imm: off; once: off

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.
@@ -671,7 +622,6 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824



Event: l1_grow_write_table; errno: 28; imm: off; once: off

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.

tests/qemu-iotests/026.out.nocache

+0 −50
Original line number Diff line number Diff line
@@ -14,7 +14,6 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: l1_update; errno: 5; imm: off; once: off; write 

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error
@@ -23,7 +22,6 @@ This means waste of disk space, but no harm to data. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: l1_update; errno: 5; imm: off; once: off; write -b

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error
@@ -42,7 +40,6 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: l1_update; errno: 28; imm: off; once: off; write 

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device
@@ -51,7 +48,6 @@ This means waste of disk space, but no harm to data. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: l1_update; errno: 28; imm: off; once: off; write -b

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device
@@ -78,11 +74,7 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
Event: l2_load; errno: 5; imm: off; once: off; write 

wrote 131072/131072 bytes at offset 0

128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

read failed: Input/output error

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
@@ -90,11 +82,7 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
Event: l2_load; errno: 5; imm: off; once: off; write -b

wrote 131072/131072 bytes at offset 0

128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

read failed: Input/output error

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
@@ -118,11 +106,7 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
Event: l2_load; errno: 28; imm: off; once: off; write 

wrote 131072/131072 bytes at offset 0

128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

read failed: No space left on device

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
@@ -130,11 +114,7 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
Event: l2_load; errno: 28; imm: off; once: off; write -b

wrote 131072/131072 bytes at offset 0

128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

read failed: No space left on device

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
@@ -314,14 +294,12 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: refblock_load; errno: 5; imm: off; once: off; write 

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: refblock_load; errno: 5; imm: off; once: off; write -b

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.
@@ -338,14 +316,12 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: refblock_load; errno: 28; imm: off; once: off; write 

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: refblock_load; errno: 28; imm: off; once: off; write -b

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.
@@ -362,14 +338,12 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: refblock_update_part; errno: 5; imm: off; once: off; write 

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: refblock_update_part; errno: 5; imm: off; once: off; write -b

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.
@@ -386,14 +360,12 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: refblock_update_part; errno: 28; imm: off; once: off; write 

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: refblock_update_part; errno: 28; imm: off; once: off; write -b

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.
@@ -410,14 +382,12 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: refblock_alloc; errno: 5; imm: off; once: off; write 

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: refblock_alloc; errno: 5; imm: off; once: off; write -b

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.
@@ -434,14 +404,12 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: refblock_alloc; errno: 28; imm: off; once: off; write 

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: refblock_alloc; errno: 28; imm: off; once: off; write -b

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.
@@ -458,15 +426,11 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: cluster_alloc; errno: 5; imm: off; once: off; write 

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: cluster_alloc; errno: 5; imm: off; once: off; write -b

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
@@ -482,15 +446,11 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: cluster_alloc; errno: 28; imm: off; once: off; write 

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: cluster_alloc; errno: 28; imm: off; once: off; write -b

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.
@@ -561,7 +521,6 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: refblock_alloc_write_blocks; errno: 28; imm: off; once: off; write 

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device
@@ -570,7 +529,6 @@ This means waste of disk space, but no harm to data. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: refblock_alloc_write_blocks; errno: 28; imm: off; once: off; write -b

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device
@@ -589,7 +547,6 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: refblock_alloc_write_table; errno: 28; imm: off; once: off; write 

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device
@@ -598,7 +555,6 @@ This means waste of disk space, but no harm to data. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: refblock_alloc_write_table; errno: 28; imm: off; once: off; write -b

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device
@@ -643,8 +599,6 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: l1_grow_alloc_table; errno: 5; imm: off; once: off

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
@@ -655,8 +609,6 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: l1_grow_alloc_table; errno: 28; imm: off; once: off

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
@@ -667,7 +619,6 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: l1_grow_write_table; errno: 5; imm: off; once: off

Failed to flush the L2 table cache: Input/output error

Failed to flush the refcount block cache: Input/output error

write failed: Input/output error

No errors were found on the image.
@@ -679,7 +630,6 @@ No errors were found on the image. 
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 



Event: l1_grow_write_table; errno: 28; imm: off; once: off

Failed to flush the L2 table cache: No space left on device

Failed to flush the refcount block cache: No space left on device

write failed: No space left on device

No errors were found on the image.