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From: Kevin Wolf <kwolf@redhat.com>
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Date: Tue, 9 Jun 2015 10:45:16 +0200
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Subject: [PATCH] raw-posix: Fix .bdrv_co_get_block_status() for unaligned
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image size
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Image files with an unaligned image size have a final hole that starts
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at EOF, i.e. in the middle of a sector. Currently, *pnum == 0 is
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returned when checking the status of this sector. In qemu-img, this
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triggers an assertion failure.
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In order to fix this, one type for the sector that contains EOF must be
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found. Treating a hole as data is safe, so this patch rounds the
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calculated number of data sectors up, so that a partial sector at EOF is
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treated as a full data sector.
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This fixes https://bugzilla.redhat.com/show_bug.cgi?id=1229394
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Tested-by: Cole Robinson <crobinso@redhat.com>
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(cherry picked from commit b8684454e152ca2e100f4b59d80de2be27186206)
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---
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block/raw-posix.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/block/raw-posix.c b/block/raw-posix.c
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index 24d8582..88f0462 100644
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--- a/block/raw-posix.c
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+++ b/block/raw-posix.c
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@@ -1846,8 +1846,9 @@ static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
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*pnum = nb_sectors;
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ret = BDRV_BLOCK_DATA;
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} else if (data == start) {
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- /* On a data extent, compute sectors to the end of the extent. */
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- *pnum = MIN(nb_sectors, (hole - start) / BDRV_SECTOR_SIZE);
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+ /* On a data extent, compute sectors to the end of the extent,
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+ * possibly including a partial sector at EOF. */
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+ *pnum = MIN(nb_sectors, DIV_ROUND_UP(hole - start, BDRV_SECTOR_SIZE));
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ret = BDRV_BLOCK_DATA;
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} else {
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/* On a hole, compute sectors to the beginning of the next extent. */
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