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block: move block exports to libblockdev

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Block exports are used by softmmu, qemu-storage-daemon, and qemu-nbd.
They are not used by other programs and are not otherwise needed in
libblock.

Undo the recent move of blockdev-nbd.c from blockdev_ss into block_ss.
Since bdrv_close_all() (libblock) calls blk_exp_close_all()
(libblockdev) a stub function is required..

Make qemu-nbd.c use signal handling utility functions instead of
duplicating the code. This helps because os-posix.c is in libblockdev
and it depends on a qemu_system_killed() symbol that qemu-nbd.c lacks.
Once we use the signal handling utility functions we also end up
providing the necessary symbol.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20200929125516.186715-4-stefanha@redhat.com
[Fixed s/ndb/nbd/ typo in commit description as suggested by Eric Blake
--Stefan]
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2020-09-29 13:55:15 +01:00
parent 4fb9071f65
commit cbc20bfb8f
6 changed files with 22 additions and 17 deletions
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7
stubs/blk-exp-close-all.c Normal file
View file

@ -0,0 +1,7 @@
#include "qemu/osdep.h"
#include "block/export.h"
/* Only used in programs that support block exports (libblockdev.fa) */
void blk_exp_close_all(void)
{
}

1
stubs/meson.build
View file

@ -1,6 +1,7 @@
stub_ss.add(files('arch_type.c'))
stub_ss.add(files('bdrv-next-monitor-owned.c'))
stub_ss.add(files('blk-commit-all.c'))
stub_ss.add(files('blk-exp-close-all.c'))
stub_ss.add(files('blockdev-close-all-bdrv-states.c'))
stub_ss.add(files('change-state-handler.c'))
stub_ss.add(files('cmos.c'))