mirror: Skip writing zeroes when target is already zero

When mirroring, the goal is to ensure that the destination reads the
same as the source; this goal is met whether the destination is sparse
or fully-allocated (except when explicitly punching holes, then merely
reading zero is not enough to know if it is sparse, so we still want
to punch the hole).  Avoiding a redundant write to zero (whether in
the background because the zero cluster was marked in the dirty
bitmap, or in the foreground because the guest is writing zeroes) when
the destination already reads as zero makes mirroring faster, and
avoids allocating the destination merely because the source reports as
allocated.

The effect is especially pronounced when the source is a raw file.
That's because when the source is a qcow2 file, the dirty bitmap only
visits the portions of the source that are allocated, which tend to be
non-zero.  But when the source is a raw file,
bdrv_co_is_allocated_above() reports the entire file as allocated so
mirror_dirty_init sets the entire dirty bitmap, and it is only later
during mirror_iteration that we change to consulting the more precise
bdrv_co_block_status_above() to learn where the source reads as zero.

Remember that since a mirror operation can write a cluster more than
once (every time the guest changes the source, the destination is also
changed to keep up), and the guest can change whether a given cluster
reads as zero, is discarded, or has non-zero data over the course of
the mirror operation, we can't take the shortcut of relying on
s->target_is_zero (which is static for the life of the job) in
mirror_co_zero() to see if the destination is already zero, because
that information may be stale.  Any solution we use must be dynamic in
the face of the guest writing or discarding a cluster while the mirror
has been ongoing.

We could just teach mirror_co_zero() to do a block_status() probe of
the destination, and skip the zeroes if the destination already reads
as zero, but we know from past experience that extra block_status()
calls are not always cheap (tmpfs, anyone?), especially when they are
random access rather than linear.  Use of block_status() of the source
by the background task in a linear fashion is not our bottleneck (it's
a background task, after all); but since mirroring can be done while
the source is actively being changed, we don't want a slow
block_status() of the destination to occur on the hot path of the
guest trying to do random-access writes to the source.

So this patch takes a slightly different approach: any time we have to
track dirty clusters, we can also track which clusters are known to
read as zero.  For sync=TOP or when we are punching holes from
"detect-zeroes":"unmap", the zero bitmap starts out empty, but
prevents a second write zero to a cluster that was already zero by an
earlier pass; for sync=FULL when we are not punching holes, the zero
bitmap starts out full if the destination reads as zero during
initialization.  Either way, I/O to the destination can now avoid
redundant write zero to a cluster that already reads as zero, all
without having to do a block_status() per write on the destination.

With this patch, if I create a raw sparse destination file, connect it
with QMP 'blockdev-add' while leaving it at the default "discard":
"ignore", then run QMP 'blockdev-mirror' with "sync": "full", the
destination remains sparse rather than fully allocated.  Meanwhile, a
destination image that is already fully allocated remains so unless it
was opened with "detect-zeroes": "unmap".  And any time writing zeroes
is skipped, the job counters are not incremented.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-ID: <20250509204341.3553601-26-eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

diff --git a/block/mirror.c b/block/mirror.c
index bca99ec206b4f1bbe5090847426b78ff0822a01f..724318f0371eb47bdc86496af7dab7bcd5e87ed7 100644 (file)
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -73,6 +73,7 @@ typedef struct MirrorBlockJob {
     size_t buf_size;
     int64_t bdev_length;
     unsigned long *cow_bitmap;
+    unsigned long *zero_bitmap;
     BdrvDirtyBitmap *dirty_bitmap;
     BdrvDirtyBitmapIter *dbi;
     uint8_t *buf;
@@ -108,9 +109,12 @@ struct MirrorOp {
     int64_t offset;
     uint64_t bytes;
 
-    /* The pointee is set by mirror_co_read(), mirror_co_zero(), and
-     * mirror_co_discard() before yielding for the first time */
+    /*
+     * These pointers are set by mirror_co_read(), mirror_co_zero(), and
+     * mirror_co_discard() before yielding for the first time
+     */
     int64_t *bytes_handled;
+    bool *io_skipped;
 
     bool is_pseudo_op;
     bool is_active_write;
@@ -408,15 +412,34 @@ static void coroutine_fn mirror_co_read(void *opaque)
 static void coroutine_fn mirror_co_zero(void *opaque)
 {
     MirrorOp *op = opaque;
-    int ret;
+    bool write_needed = true;
+    int ret = 0;
 
     op->s->in_flight++;
     op->s->bytes_in_flight += op->bytes;
     *op->bytes_handled = op->bytes;
     op->is_in_flight = true;
 
-    ret = blk_co_pwrite_zeroes(op->s->target, op->offset, op->bytes,
-                               op->s->unmap ? BDRV_REQ_MAY_UNMAP : 0);
+    if (op->s->zero_bitmap) {
+        unsigned long end = DIV_ROUND_UP(op->offset + op->bytes,
+                                         op->s->granularity);
+        assert(QEMU_IS_ALIGNED(op->offset, op->s->granularity));
+        assert(QEMU_IS_ALIGNED(op->bytes, op->s->granularity) ||
+               op->offset + op->bytes == op->s->bdev_length);
+        if (find_next_zero_bit(op->s->zero_bitmap, end,
+                               op->offset / op->s->granularity) == end) {
+            write_needed = false;
+            *op->io_skipped = true;
+        }
+    }
+    if (write_needed) {
+        ret = blk_co_pwrite_zeroes(op->s->target, op->offset, op->bytes,
+                                   op->s->unmap ? BDRV_REQ_MAY_UNMAP : 0);
+    }
+    if (ret >= 0 && op->s->zero_bitmap) {
+        bitmap_set(op->s->zero_bitmap, op->offset / op->s->granularity,
+                   DIV_ROUND_UP(op->bytes, op->s->granularity));
+    }
     mirror_write_complete(op, ret);
 }
 
@@ -435,29 +458,43 @@ static void coroutine_fn mirror_co_discard(void *opaque)
 }
 
 static unsigned mirror_perform(MirrorBlockJob *s, int64_t offset,
-                               unsigned bytes, MirrorMethod mirror_method)
+                               unsigned bytes, MirrorMethod mirror_method,
+                               bool *io_skipped)
 {
     MirrorOp *op;
     Coroutine *co;
     int64_t bytes_handled = -1;
 
+    assert(QEMU_IS_ALIGNED(offset, s->granularity));
+    assert(QEMU_IS_ALIGNED(bytes, s->granularity) ||
+           offset + bytes == s->bdev_length);
     op = g_new(MirrorOp, 1);
     *op = (MirrorOp){
         .s              = s,
         .offset         = offset,
         .bytes          = bytes,
         .bytes_handled  = &bytes_handled,
+        .io_skipped     = io_skipped,
     };
     qemu_co_queue_init(&op->waiting_requests);
 
     switch (mirror_method) {
     case MIRROR_METHOD_COPY:
+        if (s->zero_bitmap) {
+            bitmap_clear(s->zero_bitmap, offset / s->granularity,
+                         DIV_ROUND_UP(bytes, s->granularity));
+        }
         co = qemu_coroutine_create(mirror_co_read, op);
         break;
     case MIRROR_METHOD_ZERO:
+        /* s->zero_bitmap handled in mirror_co_zero */
         co = qemu_coroutine_create(mirror_co_zero, op);
         break;
     case MIRROR_METHOD_DISCARD:
+        if (s->zero_bitmap) {
+            bitmap_clear(s->zero_bitmap, offset / s->granularity,
+                         DIV_ROUND_UP(bytes, s->granularity));
+        }
         co = qemu_coroutine_create(mirror_co_discard, op);
         break;
     default:
@@ -568,6 +605,7 @@ static void coroutine_fn GRAPH_UNLOCKED mirror_iteration(MirrorBlockJob *s)
         int ret = -1;
         int64_t io_bytes;
         int64_t io_bytes_acct;
+        bool io_skipped = false;
         MirrorMethod mirror_method = MIRROR_METHOD_COPY;
 
         assert(!(offset % s->granularity));
@@ -611,8 +649,10 @@ static void coroutine_fn GRAPH_UNLOCKED mirror_iteration(MirrorBlockJob *s)
         }
 
         io_bytes = mirror_clip_bytes(s, offset, io_bytes);
-        io_bytes = mirror_perform(s, offset, io_bytes, mirror_method);
-        if (mirror_method != MIRROR_METHOD_COPY && write_zeroes_ok) {
+        io_bytes = mirror_perform(s, offset, io_bytes, mirror_method,
+                                  &io_skipped);
+        if (io_skipped ||
+            (mirror_method != MIRROR_METHOD_COPY && write_zeroes_ok)) {
             io_bytes_acct = 0;
         } else {
             io_bytes_acct = io_bytes;
@@ -847,8 +887,10 @@ static int coroutine_fn GRAPH_UNLOCKED mirror_dirty_init(MirrorBlockJob *s)
     bool punch_holes =
         target_bs->detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
         bdrv_can_write_zeroes_with_unmap(target_bs);
+    int64_t bitmap_length = DIV_ROUND_UP(s->bdev_length, s->granularity);
 
     /* Determine if the image is already zero, regardless of sync mode.  */
+    s->zero_bitmap = bitmap_new(bitmap_length);
     bdrv_graph_co_rdlock();
     bs = s->mirror_top_bs->backing->bs;
     if (s->target_is_zero) {
@@ -862,7 +904,14 @@ static int coroutine_fn GRAPH_UNLOCKED mirror_dirty_init(MirrorBlockJob *s)
     if (ret < 0) {
         return ret;
     } else if (s->sync_mode == MIRROR_SYNC_MODE_TOP) {
-        /* In TOP mode, there is no benefit to a pre-zeroing pass.  */
+        /*
+         * In TOP mode, there is no benefit to a pre-zeroing pass, but
+         * the zero bitmap can be set if the destination already reads
+         * as zero and we are not punching holes.
+         */
+        if (ret > 0 && !punch_holes) {
+            bitmap_set(s->zero_bitmap, 0, bitmap_length);
+        }
     } else if (ret == 0 || punch_holes) {
         /*
          * Here, we are in FULL mode; our goal is to avoid writing
@@ -871,8 +920,9 @@ static int coroutine_fn GRAPH_UNLOCKED mirror_dirty_init(MirrorBlockJob *s)
          * zeroing happened externally (ret > 0) or if we have a fast
          * way to pre-zero the image (the dirty bitmap will be
          * populated later by the non-zero portions, the same as for
-         * TOP mode).  If pre-zeroing is not fast, or we need to punch
-         * holes, then our only recourse is to write the entire image.
+         * TOP mode).  If pre-zeroing is not fast, then our only
+         * recourse is to mark the entire image dirty.  The act of
+         * pre-zeroing will populate the zero bitmap.
          */
         if (!bdrv_can_write_zeroes_with_unmap(target_bs)) {
             bdrv_set_dirty_bitmap(s->dirty_bitmap, 0, s->bdev_length);
@@ -883,6 +933,7 @@ static int coroutine_fn GRAPH_UNLOCKED mirror_dirty_init(MirrorBlockJob *s)
         for (offset = 0; offset < s->bdev_length; ) {
             int bytes = MIN(s->bdev_length - offset,
                             QEMU_ALIGN_DOWN(INT_MAX, s->granularity));
+            bool ignored;
 
             mirror_throttle(s);
 
@@ -898,12 +949,15 @@ static int coroutine_fn GRAPH_UNLOCKED mirror_dirty_init(MirrorBlockJob *s)
                 continue;
             }
 
-            mirror_perform(s, offset, bytes, MIRROR_METHOD_ZERO);
+            mirror_perform(s, offset, bytes, MIRROR_METHOD_ZERO, &ignored);
             offset += bytes;
         }
 
         mirror_wait_for_all_io(s);
         s->initial_zeroing_ongoing = false;
+    } else {
+        /* In FULL mode, and image already reads as zero.  */
+        bitmap_set(s->zero_bitmap, 0, bitmap_length);
     }
 
     /* First part, loop on the sectors and initialize the dirty bitmap.  */
@@ -1188,6 +1242,7 @@ immediate_exit:
     assert(s->in_flight == 0);
     qemu_vfree(s->buf);
     g_free(s->cow_bitmap);
+    g_free(s->zero_bitmap);
     g_free(s->in_flight_bitmap);
     bdrv_dirty_iter_free(s->dbi);
 
@@ -1367,6 +1422,7 @@ do_sync_target_write(MirrorBlockJob *job, MirrorMethod method,
     int ret;
     size_t qiov_offset = 0;
     int64_t dirty_bitmap_offset, dirty_bitmap_end;
+    int64_t zero_bitmap_offset, zero_bitmap_end;
 
     if (!QEMU_IS_ALIGNED(offset, job->granularity) &&
         bdrv_dirty_bitmap_get(job->dirty_bitmap, offset))
@@ -1410,8 +1466,9 @@ do_sync_target_write(MirrorBlockJob *job, MirrorMethod method,
     }
 
     /*
-     * Tails are either clean or shrunk, so for bitmap resetting
-     * we safely align the range down.
+     * Tails are either clean or shrunk, so for dirty bitmap resetting
+     * we safely align the range narrower.  But for zero bitmap, round
+     * range wider for checking or clearing, and narrower for setting.
      */
     dirty_bitmap_offset = QEMU_ALIGN_UP(offset, job->granularity);
     dirty_bitmap_end = QEMU_ALIGN_DOWN(offset + bytes, job->granularity);
@@ -1419,22 +1476,44 @@ do_sync_target_write(MirrorBlockJob *job, MirrorMethod method,
         bdrv_reset_dirty_bitmap(job->dirty_bitmap, dirty_bitmap_offset,
                                 dirty_bitmap_end - dirty_bitmap_offset);
     }
+    zero_bitmap_offset = offset / job->granularity;
+    zero_bitmap_end = DIV_ROUND_UP(offset + bytes, job->granularity);
 
     job_progress_increase_remaining(&job->common.job, bytes);
     job->active_write_bytes_in_flight += bytes;
 
     switch (method) {
     case MIRROR_METHOD_COPY:
+        if (job->zero_bitmap) {
+            bitmap_clear(job->zero_bitmap, zero_bitmap_offset,
+                         zero_bitmap_end - zero_bitmap_offset);
+        }
         ret = blk_co_pwritev_part(job->target, offset, bytes,
                                   qiov, qiov_offset, flags);
         break;
 
     case MIRROR_METHOD_ZERO:
+        if (job->zero_bitmap) {
+            if (find_next_zero_bit(job->zero_bitmap, zero_bitmap_end,
+                                   zero_bitmap_offset) == zero_bitmap_end) {
+                ret = 0;
+                break;
+            }
+        }
         assert(!qiov);
         ret = blk_co_pwrite_zeroes(job->target, offset, bytes, flags);
+        if (job->zero_bitmap && ret >= 0) {
+            bitmap_set(job->zero_bitmap, dirty_bitmap_offset / job->granularity,
+                       (dirty_bitmap_end - dirty_bitmap_offset) /
+                       job->granularity);
+        }
         break;
 
     case MIRROR_METHOD_DISCARD:
+        if (job->zero_bitmap) {
+            bitmap_clear(job->zero_bitmap, zero_bitmap_offset,
+                         zero_bitmap_end - zero_bitmap_offset);
+        }
         assert(!qiov);
         ret = blk_co_pdiscard(job->target, offset, bytes);
         break;