[PATCH] gluster: Align block-status tail

* [PATCH] gluster: Align block-status tail
@ 2021-08-05 14:36 Max Reitz
  2021-08-05 19:35 ` Eric Blake
  2021-09-07  8:08 ` Hanna Reitz
  0 siblings, 2 replies; 3+ messages in thread
From: Max Reitz @ 2021-08-05 14:36 UTC (permalink / raw)
  To: qemu-block; +Cc: Kevin Wolf, qemu-devel, Max Reitz

gluster's block-status implementation is basically a copy of that in
block/file-posix.c, there is only one thing missing, and that is
aligning trailing data extents to the request alignment (as added by
commit 9c3db310ff0).

Note that 9c3db310ff0 mentions that "there seems to be no other block
driver that sets request_alignment and [...]", but while block/gluster.c
does indeed not set request_alignment, block/io.c's
bdrv_refresh_limits() will still default to an alignment of 512 because
block/gluster.c does not provide a byte-aligned read function.
Therefore, unaligned tails can conceivably occur, and so we should apply
the change from 9c3db310ff0 to gluster's block-status implementation.

Reported-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 block/gluster.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/block/gluster.c b/block/gluster.c
index e8ee14c8e9..48a04417cf 100644
--- a/block/gluster.c
+++ b/block/gluster.c
@@ -1477,6 +1477,8 @@ static int coroutine_fn qemu_gluster_co_block_status(BlockDriverState *bs,
     off_t data = 0, hole = 0;
     int ret = -EINVAL;
 
+    assert(QEMU_IS_ALIGNED(offset | bytes, bs->bl.request_alignment));
+
     if (!s->fd) {
         return ret;
     }
@@ -1501,6 +1503,20 @@ static int coroutine_fn qemu_gluster_co_block_status(BlockDriverState *bs,
         /* On a data extent, compute bytes to the end of the extent,
          * possibly including a partial sector at EOF. */
         *pnum = MIN(bytes, hole - offset);
+
+        /*
+         * We are not allowed to return partial sectors, though, so
+         * round up if necessary.
+         */
+        if (!QEMU_IS_ALIGNED(*pnum, bs->bl.request_alignment)) {
+            int64_t file_length = qemu_gluster_getlength(bs);
+            if (file_length > 0) {
+                /* Ignore errors, this is just a safeguard */
+                assert(hole == file_length);
+            }
+            *pnum = ROUND_UP(*pnum, bs->bl.request_alignment);
+        }
+
         ret = BDRV_BLOCK_DATA;
     } else {
         /* On a hole, compute bytes to the beginning of the next extent.  */
-- 
2.31.1



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