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block: add BlockLimits.max_iov field

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The maximum number of struct iovec elements depends on the
BlockDriverState.  The raw-posix and iSCSI protocols have a maximum of
IOV_MAX but others could have different values.

Cc: Peter Lieven <pl@kamp.de>
Suggested-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2015-07-09 10:56:44 +01:00
parent 49cffbc607
commit bd44feb754
2 changed files with 10 additions and 0 deletions
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3
include/block/block_int.h
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@ -330,6 +330,9 @@ typedef struct BlockLimits {
/* memory alignment for bounce buffer */
size_t opt_mem_alignment;
/* maximum number of iovec elements */
int max_iov;
} BlockLimits;
typedef struct BdrvOpBlocker BdrvOpBlocker;