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block: Document BDRV_REQ_WRITE_UNCHANGED support
authorMax Reitz <mreitz@redhat.com>
Wed, 2 May 2018 14:03:59 +0000 (16:03 +0200)
committerMax Reitz <mreitz@redhat.com>
Tue, 15 May 2018 14:15:21 +0000 (16:15 +0200)
commitc1e3489dfaa01d215e37b1412759b856c33d44ed
treeb86bfa3ae8ba04fd314fc92556151e24112adb30tree
parent5279b30392da7a3248b320c75f20c61e3a95863ccommit | diff
block: Document BDRV_REQ_WRITE_UNCHANGED support

Add BDRV_REQ_WRITE_UNCHANGED to the list of flags honored during pwrite
and pwrite_zeroes, and also add a note on when you absolutely need to
support it.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-id: 20180502140359.18222-1-mreitz@redhat.com
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
include/block/block_int.h diff | blob | blame | history
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