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[Qemu-devel] [PATCH V12 07/13] quorum: Add quorum_getlength().
From: |
Benoît Canet |
Subject: |
[Qemu-devel] [PATCH V12 07/13] quorum: Add quorum_getlength(). |
Date: |
Mon, 3 Feb 2014 16:37:00 +0100 |
From: Benoît Canet <address@hidden>
Check that every bs file returns the same length.
Otherwise, return -EIO to disable the quorum and
avoid length discrepancy.
Signed-off-by: Benoit Canet <address@hidden>
Reviewed-by: Max Reitz <address@hidden>
---
block/quorum.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/block/quorum.c b/block/quorum.c
index c546d7a..1ac3ab9 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -586,12 +586,38 @@ static BlockDriverAIOCB
*quorum_aio_writev(BlockDriverState *bs,
return &acb->common;
}
+static int64_t quorum_getlength(BlockDriverState *bs)
+{
+ BDRVQuorumState *s = bs->opaque;
+ int64_t result;
+ int i;
+
+ /* check that all file have the same length */
+ result = bdrv_getlength(s->bs[0]);
+ if (result < 0) {
+ return result;
+ }
+ for (i = 1; i < s->total; i++) {
+ int64_t value = bdrv_getlength(s->bs[i]);
+ if (value < 0) {
+ return value;
+ }
+ if (value != result) {
+ return -EIO;
+ }
+ }
+
+ return result;
+}
+
static BlockDriver bdrv_quorum = {
.format_name = "quorum",
.protocol_name = "quorum",
.instance_size = sizeof(BDRVQuorumState),
+ .bdrv_getlength = quorum_getlength,
+
.bdrv_aio_readv = quorum_aio_readv,
.bdrv_aio_writev = quorum_aio_writev,
};
--
1.8.3.2
- [Qemu-devel] [PATCH V12 00/13] quorum block filter, Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V12 02/13] quorum: Create BDRVQuorumState and BlkDriver and do init., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V12 01/13] quorum: Create quorum.c, add QuorumSingleAIOCB and QuorumAIOCB., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V12 04/13] blkverify: Extract qemu_iovec_clone() and qemu_iovec_compare() from blkverify., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V12 03/13] quorum: Add quorum_aio_writev and its dependencies., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V12 05/13] quorum: Add quorum_aio_readv., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V12 07/13] quorum: Add quorum_getlength().,
Benoît Canet <=
- [Qemu-devel] [PATCH V12 10/13] quorum: Add quorum_co_flush()., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V12 09/13] quorum: Add quorum_co_get_block_status., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V12 06/13] quorum: Add quorum mechanism., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V12 08/13] quorum: Add quorum_invalidate_cache()., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V12 13/13] quorum: Add unit test., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V12 12/13] quorum: Add quorum_open() and quorum_close()., Benoît Canet, 2014/02/03
- [Qemu-devel] [PATCH V12 11/13] quorum: Implement recursive .bdrv_recurse_is_first_non_filter in quorum., Benoît Canet, 2014/02/03