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[Qemu-devel] [PATCHv2 2/4] block: immediately cancel oversized read/writ
From: |
Peter Lieven |
Subject: |
[Qemu-devel] [PATCHv2 2/4] block: immediately cancel oversized read/write requests |
Date: |
Fri, 12 Sep 2014 13:21:50 +0200 |
Signed-off-by: Peter Lieven <address@hidden>
---
block.c | 14 ++++++++++++++
trace-events | 2 ++
2 files changed, 16 insertions(+)
diff --git a/block.c b/block.c
index c87e9fd..965e9bc 100644
--- a/block.c
+++ b/block.c
@@ -3215,6 +3215,13 @@ static int coroutine_fn
bdrv_co_do_readv(BlockDriverState *bs,
return -EINVAL;
}
+ if (bs->bl.max_transfer_length &&
+ nb_sectors > bs->bl.max_transfer_length) {
+ trace_bdrv_co_do_readv_toobig(bs, sector_num, nb_sectors,
+ bs->bl.max_transfer_length);
+ return -EINVAL;
+ }
+
return bdrv_co_do_preadv(bs, sector_num << BDRV_SECTOR_BITS,
nb_sectors << BDRV_SECTOR_BITS, qiov, flags);
}
@@ -3507,6 +3514,13 @@ static int coroutine_fn
bdrv_co_do_writev(BlockDriverState *bs,
return -EINVAL;
}
+ if (bs->bl.max_transfer_length &&
+ nb_sectors > bs->bl.max_transfer_length) {
+ trace_bdrv_co_do_writev_toobig(bs, sector_num, nb_sectors,
+ bs->bl.max_transfer_length);
+ return -EINVAL;
+ }
+
return bdrv_co_do_pwritev(bs, sector_num << BDRV_SECTOR_BITS,
nb_sectors << BDRV_SECTOR_BITS, qiov, flags);
}
diff --git a/trace-events b/trace-events
index fb58963..fe2c5d8 100644
--- a/trace-events
+++ b/trace-events
@@ -68,8 +68,10 @@ bdrv_aio_writev(void *bs, int64_t sector_num, int
nb_sectors, void *opaque) "bs
bdrv_aio_write_zeroes(void *bs, int64_t sector_num, int nb_sectors, int flags,
void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d flags %#x opaque %p"
bdrv_lock_medium(void *bs, bool locked) "bs %p locked %d"
bdrv_co_readv(void *bs, int64_t sector_num, int nb_sector) "bs %p sector_num
%"PRId64" nb_sectors %d"
+bdrv_co_do_readv_toobig(void *bs, int64_t sector_num, int nb_sector, int
max_transfer_length) "bs %p sector_num %"PRId64" nb_sectors %d
bs->bl.max_transfer_length %d"
bdrv_co_copy_on_readv(void *bs, int64_t sector_num, int nb_sector) "bs %p
sector_num %"PRId64" nb_sectors %d"
bdrv_co_writev(void *bs, int64_t sector_num, int nb_sector) "bs %p sector_num
%"PRId64" nb_sectors %d"
+bdrv_co_do_writev_toobig(void *bs, int64_t sector_num, int nb_sector, int
max_transfer_length) "bs %p sector_num %"PRId64" nb_sectors %d
bs->bl.max_transfer_length %d"
bdrv_co_write_zeroes(void *bs, int64_t sector_num, int nb_sector, int flags)
"bs %p sector_num %"PRId64" nb_sectors %d flags %#x"
bdrv_co_io_em(void *bs, int64_t sector_num, int nb_sectors, int is_write, void
*acb) "bs %p sector_num %"PRId64" nb_sectors %d is_write %d acb %p"
bdrv_co_do_copy_on_readv(void *bs, int64_t sector_num, int nb_sectors, int64_t
cluster_sector_num, int cluster_nb_sectors) "bs %p sector_num %"PRId64"
nb_sectors %d cluster_sector_num %"PRId64" cluster_nb_sectors %d"
--
1.7.9.5