Commit 980b0f94 authored by Kevin Wolf's avatar Kevin Wolf
Browse files

block: Add blk_set_allow_aio_context_change() 



Some users (like block jobs) can tolerate an AioContext change for their
BlockBackend. Add a function that tells the BlockBackend that it can
allow changes.

Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
parent 38475269

block/block-backend.c

+10 −0
Original line number Diff line number Diff line
@@ -71,6 +71,7 @@ struct BlockBackend { 
    uint64_t shared_perm;

    bool disable_perm;



    bool allow_aio_context_change;

    bool allow_write_beyond_eof;



    NotifierList remove_bs_notifiers, insert_bs_notifiers;
@@ -1092,6 +1093,11 @@ void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow) 
    blk->allow_write_beyond_eof = allow;

}



void blk_set_allow_aio_context_change(BlockBackend *blk, bool allow)

{

    blk->allow_aio_context_change = allow;

}



static int blk_check_byte_request(BlockBackend *blk, int64_t offset,

                                  size_t size)

{
@@ -1891,6 +1897,10 @@ static bool blk_root_can_set_aio_ctx(BdrvChild *child, AioContext *ctx, 
{

    BlockBackend *blk = child->opaque;



    if (blk->allow_aio_context_change) {

        return true;

    }



    /* Only manually created BlockBackends that are not attached to anything

     * can change their AioContext without updating their user. */

    if (!blk->name || blk->dev) {

include/sysemu/block-backend.h

+1 −0
Original line number Diff line number Diff line
@@ -103,6 +103,7 @@ int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm, 
void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm);



void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow);

void blk_set_allow_aio_context_change(BlockBackend *blk, bool allow);

void blk_iostatus_enable(BlockBackend *blk);

bool blk_iostatus_is_enabled(const BlockBackend *blk);

BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk);