diff options
| author | Eric Blake <eblake@redhat.com> | 2017-05-04 21:14:59 -0500 |
|---|---|---|
| committer | Fam Zheng <famz@redhat.com> | 2017-06-30 21:48:06 +0800 |
| commit | fb0d8654ffc3ea1494067327fc4c4da5d0872724 (patch) | |
| tree | af7bb87f837463be3a8440529f1fcd492c648d52 /include | |
| parent | 36f87b4513373b3cd79c87c9197d17face95d4ac (diff) | |
block: Add BDRV_BLOCK_EOF to bdrv_get_block_status()
Just as the block layer already sets BDRV_BLOCK_ALLOCATED as a
shortcut for subsequent operations, there are also some optimizations
that are made easier if we can quickly tell that *pnum will advance
us to the end of a file, via a new BDRV_BLOCK_EOF which gets set
by the block layer.
This just plumbs up the new bit; subsequent patches will make use
of it.
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20170505021500.19315-2-eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/block/block.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/block/block.h b/include/block/block.h index 85e4be7462..4c149adb17 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -129,6 +129,7 @@ typedef struct HDGeometry { * BDRV_BLOCK_OFFSET_VALID: an associated offset exists for accessing raw data * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this * layer (short for DATA || ZERO), set by block layer + * BDRV_BLOCK_EOF: the returned pnum covers through end of file for this layer * * Internal flag: * BDRV_BLOCK_RAW: used internally to indicate that the request was @@ -157,6 +158,7 @@ typedef struct HDGeometry { #define BDRV_BLOCK_OFFSET_VALID 0x04 #define BDRV_BLOCK_RAW 0x08 #define BDRV_BLOCK_ALLOCATED 0x10 +#define BDRV_BLOCK_EOF 0x20 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue; |