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qemu/tests/qemu-iotests/121.out

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iotests: Add tests for refcount table growth Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 1423598552-24301-3-git-send-email-mreitz@redhat.com Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
2015-02-10 23:02:32 +03:00
QA output created by 121
=== New refcount structures may not conflict with existing structures ===
--- Test 1 ---
opts: produce valid command line in qemu_opts_print This will let us print options in a format that the user would actually write it on the command line (foo=bar,baz=asd,etc=def), without prepending a spurious comma at the beginning of the list, or quoting values unnecessarily. This patch provides the following changes: * write and id=, if the option has an id * do not print separator before the first element * do not quote string arguments * properly escape commas (,) for QEMU Signed-off-by: Kővágó, Zoltán <DirtY.iCE.hu@gmail.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2015-07-07 17:42:10 +03:00
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=66060288 preallocation=metadata
iotests: Add tests for refcount table growth Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 1423598552-24301-3-git-send-email-mreitz@redhat.com Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
2015-02-10 23:02:32 +03:00
Image resized.
wrote 1049600/1049600 bytes at offset 65011712
1.001 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 1048576/1048576 bytes at offset 67108864
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
No errors were found on the image.
--- Test 2 ---
opts: produce valid command line in qemu_opts_print This will let us print options in a format that the user would actually write it on the command line (foo=bar,baz=asd,etc=def), without prepending a spurious comma at the beginning of the list, or quoting values unnecessarily. This patch provides the following changes: * write and id=, if the option has an id * do not print separator before the first element * do not quote string arguments * properly escape commas (,) for QEMU Signed-off-by: Kővágó, Zoltán <DirtY.iCE.hu@gmail.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2015-07-07 17:42:10 +03:00
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=66061312 preallocation=metadata
iotests: Add tests for refcount table growth Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 1423598552-24301-3-git-send-email-mreitz@redhat.com Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
2015-02-10 23:02:32 +03:00
Image resized.
wrote 133120/133120 bytes at offset 66060288
130 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
No errors were found on the image.
qcow2: Reset free_cluster_index when allocating a new refcount block When we try to allocate new clusters we first look for available ones starting from s->free_cluster_index and once we find them we increase their reference counts. Before we get to call update_refcount() to do this last step s->free_cluster_index is already pointing to the next cluster after the ones we are trying to allocate. During update_refcount() it may happen however that we also need to allocate a new refcount block in order to store the refcounts of these new clusters (and to complicate things further that may also require us to grow the refcount table). After all this we don't know if the clusters that we originally tried to allocate are still available, so we return -EAGAIN to ask the caller to restart the search for free clusters. This is what can happen in a common scenario: 1) We want to allocate a new cluster and we see that cluster N is free. 2) We try to increase N's refcount but all refcount blocks are full, so we allocate a new one at N+1 (where s->free_cluster_index was pointing at). 3) Once we're done we return -EAGAIN to look again for a free cluster, but now s->free_cluster_index points at N+2, so that's the one we allocate. Cluster N remains unallocated and we have a hole in the qcow2 file. This can be reproduced easily: qemu-img create -f qcow2 -o cluster_size=512 hd.qcow2 1M qemu-io -c 'write 0 124k' hd.qcow2 After this the image has 132608 bytes (256 clusters), and the refcount block is full. If we write 512 more bytes it should allocate two new clusters: the data cluster itself and a new refcount block. qemu-io -c 'write 124k 512' hd.qcow2 However the image has now three new clusters (259 in total), and the first one of them is empty (and unallocated): dd if=hd.qcow2 bs=512c skip=256 count=1 | hexdump -C If we write larger amounts of data in the last step instead of the 512 bytes used in this example we can create larger holes in the qcow2 file. What this patch does is reset s->free_cluster_index to its previous value when alloc_refcount_block() returns -EAGAIN. This way the caller will try to allocate again the original clusters if they are still free. The output of iotest 026 also needs to be updated because now that images have no holes some tests fail at a different point and the number of leaked clusters is different. Signed-off-by: Alberto Garcia <berto@igalia.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-03-21 16:38:52 +03:00
=== Allocating a new refcount block must not leave holes in the image ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
wrote 126976/126976 bytes at offset 0
124 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
size=131072 (expected 131072)
wrote 512/512 bytes at offset 126976
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
size=132096 (expected 132096)
iotests: Add tests for refcount table growth Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 1423598552-24301-3-git-send-email-mreitz@redhat.com Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
2015-02-10 23:02:32 +03:00
*** done
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