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qed: Simplify backing reads

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The other four drivers that support backing files (qcow, qcow2,
parallels, vmdk) all rely on the block layer to populate zeroes when
reading beyond EOF of a short backing file.  We can simplify the qed
code by doing likewise.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20200528094405.145708-11-vsementsov@virtuozzo.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Eric Blake 2020-05-28 12:44:05 +03:00 • committed by Max Reitz
parent a2adbbf603
commit 365fed5111
2 changed files with 6 additions and 59 deletions
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block/qed.h
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@ -140,7 +140,6 @@ typedef struct QEDAIOCB {
/* Current cluster scatter-gather list */
QEMUIOVector cur_qiov;
QEMUIOVector *backing_qiov;
uint64_t cur_pos; /* position on block device, in bytes */
uint64_t cur_cluster; /* cluster offset in image file */
unsigned int cur_nclusters; /* number of clusters being accessed */