From: Max Reitz <mreitz@redhat.com>
To: Alberto Garcia <berto@igalia.com>, qemu-devel@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>, Derek Su <dereksu@qnap.com>,
Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>,
qemu-block@nongnu.org
Subject: Re: [PATCH v9 02/34] qcow2: Convert qcow2_get_cluster_offset() into qcow2_get_host_offset()
Date: Tue, 30 Jun 2020 12:19:42 +0200 [thread overview]
Message-ID: <32a231b3-abc2-8d84-6a7d-eb8ccd388e33@redhat.com> (raw)
In-Reply-To: <4d3e11a48c18c3b4d34f567046334d4a1afde352.1593342067.git.berto@igalia.com>
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On 28.06.20 13:02, Alberto Garcia wrote:
> qcow2_get_cluster_offset() takes an (unaligned) guest offset and
> returns the (aligned) offset of the corresponding cluster in the qcow2
> image.
>
> In practice none of the callers need to know where the cluster starts
> so this patch makes the function calculate and return the final host
> offset directly. The function is also renamed accordingly.
>
> There is a pre-existing exception with compressed clusters: in this
> case the function returns the complete cluster descriptor (containing
> the offset and size of the compressed data). This does not change with
> this patch but it is now documented.
>
> Signed-off-by: Alberto Garcia <berto@igalia.com>
> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> ---
> block/qcow2.h | 4 ++--
> block/qcow2-cluster.c | 42 +++++++++++++++++++++++-------------------
> block/qcow2.c | 24 +++++++-----------------
> 3 files changed, 32 insertions(+), 38 deletions(-)
[...]
> diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
> index 4b5fc8c4a7..9ab41cb728 100644
> --- a/block/qcow2-cluster.c
> +++ b/block/qcow2-cluster.c
[...]
> @@ -537,8 +542,6 @@ int qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset,
> bytes_needed = bytes_available;
> }
>
> - *cluster_offset = 0;
> -
You drop this line without replacement now. That means that
*host_offset is no longer set to 0 if the L1 entry is out of bounds or
empty (which causes this function to return QCOW2_CLUSTER_UNALLOCATED
and no error). Was that intentional?
Max
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next prev parent reply other threads:[~2020-06-30 10:21 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-28 11:02 [PATCH v9 00/34] Add subcluster allocation to qcow2 Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 01/34] qcow2: Make Qcow2AioTask store the full host offset Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 02/34] qcow2: Convert qcow2_get_cluster_offset() into qcow2_get_host_offset() Alberto Garcia
2020-06-30 10:19 ` Max Reitz [this message]
2020-06-30 10:27 ` Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 03/34] qcow2: Add calculate_l2_meta() Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 04/34] qcow2: Split cluster_needs_cow() out of count_cow_clusters() Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 05/34] qcow2: Process QCOW2_CLUSTER_ZERO_ALLOC clusters in handle_copied() Alberto Garcia
2020-06-30 10:38 ` Max Reitz
2020-06-28 11:02 ` [PATCH v9 06/34] qcow2: Add get_l2_entry() and set_l2_entry() Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 07/34] qcow2: Document the Extended L2 Entries feature Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 08/34] qcow2: Add dummy has_subclusters() function Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 09/34] qcow2: Add subcluster-related fields to BDRVQcow2State Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 10/34] qcow2: Add offset_to_sc_index() Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 11/34] qcow2: Add offset_into_subcluster() and size_to_subclusters() Alberto Garcia
2020-07-01 12:23 ` Max Reitz
2020-06-28 11:02 ` [PATCH v9 12/34] qcow2: Add l2_entry_size() Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 13/34] qcow2: Update get/set_l2_entry() and add get/set_l2_bitmap() Alberto Garcia
2020-07-01 12:28 ` Max Reitz
2020-06-28 11:02 ` [PATCH v9 14/34] qcow2: Add QCow2SubclusterType and qcow2_get_subcluster_type() Alberto Garcia
2020-07-01 12:52 ` Max Reitz
2020-07-01 16:26 ` Alberto Garcia
2020-07-02 9:57 ` Max Reitz
2020-07-02 22:00 ` Alberto Garcia
2020-07-03 7:17 ` Max Reitz
2020-06-28 11:02 ` [PATCH v9 15/34] qcow2: Add qcow2_get_subcluster_range_type() Alberto Garcia
2020-07-01 13:37 ` Max Reitz
2020-06-28 11:02 ` [PATCH v9 16/34] qcow2: Add qcow2_cluster_is_allocated() Alberto Garcia
2020-07-01 13:55 ` Max Reitz
2020-06-28 11:02 ` [PATCH v9 17/34] qcow2: Add cluster type parameter to qcow2_get_host_offset() Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 18/34] qcow2: Replace QCOW2_CLUSTER_* with QCOW2_SUBCLUSTER_* Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 19/34] qcow2: Handle QCOW2_SUBCLUSTER_UNALLOCATED_ALLOC Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 20/34] qcow2: Add subcluster support to calculate_l2_meta() Alberto Garcia
2020-07-02 11:30 ` Max Reitz
2020-06-28 11:02 ` [PATCH v9 21/34] qcow2: Add subcluster support to qcow2_get_host_offset() Alberto Garcia
2020-07-02 12:46 ` Max Reitz
2020-07-02 22:04 ` Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 22/34] qcow2: Add subcluster support to zero_in_l2_slice() Alberto Garcia
2020-07-02 12:56 ` Max Reitz
2020-06-28 11:02 ` [PATCH v9 23/34] qcow2: Add subcluster support to discard_in_l2_slice() Alberto Garcia
2020-07-02 13:24 ` Max Reitz
2020-06-28 11:02 ` [PATCH v9 24/34] qcow2: Add subcluster support to check_refcounts_l2() Alberto Garcia
2020-07-02 13:32 ` Max Reitz
2020-06-28 11:02 ` [PATCH v9 25/34] qcow2: Update L2 bitmap in qcow2_alloc_cluster_link_l2() Alberto Garcia
2020-07-02 14:01 ` Max Reitz
2020-06-28 11:02 ` [PATCH v9 26/34] qcow2: Clear the L2 bitmap when allocating a compressed cluster Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 27/34] qcow2: Add subcluster support to handle_alloc_space() Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 28/34] qcow2: Add subcluster support to qcow2_co_pwrite_zeroes() Alberto Garcia
2020-07-02 14:28 ` Max Reitz
2020-07-02 22:40 ` Alberto Garcia
2020-07-03 7:18 ` Max Reitz
2020-06-28 11:02 ` [PATCH v9 29/34] qcow2: Add subcluster support to qcow2_measure() Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 30/34] qcow2: Add prealloc field to QCowL2Meta Alberto Garcia
2020-07-02 14:50 ` Max Reitz
2020-07-02 14:58 ` Eric Blake
2020-07-02 15:09 ` Max Reitz
2020-07-02 23:05 ` Alberto Garcia
2020-07-03 7:22 ` Max Reitz
2020-06-28 11:02 ` [PATCH v9 31/34] qcow2: Add the 'extended_l2' option and the QCOW2_INCOMPAT_EXTL2 bit Alberto Garcia
2020-07-02 15:13 ` Max Reitz
2020-07-03 12:43 ` Alberto Garcia
2020-06-28 11:02 ` [PATCH v9 32/34] qcow2: Allow preallocation and backing files if extended_l2 is set Alberto Garcia
2020-07-03 7:45 ` Max Reitz
2020-06-28 11:02 ` [PATCH v9 33/34] qcow2: Assert that expand_zero_clusters_in_l1() does not support subclusters Alberto Garcia
2020-07-03 7:46 ` Max Reitz
2020-06-28 11:02 ` [PATCH v9 34/34] iotests: Add tests for qcow2 images with extended L2 entries Alberto Garcia
2020-07-03 9:49 ` Max Reitz
2020-07-03 13:06 ` Alberto Garcia
2020-07-03 13:47 ` Max Reitz
2020-07-03 15:20 ` Alberto Garcia
2020-07-06 13:57 ` Eric Blake
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