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block: Remove bdrv_states list 

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2016-03-16 19:54:45 +01:00 committed by Kevin Wolf
parent 79720af640
commit 9aaf28c61d
4 changed files with 3 additions and 40 deletions
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31
block.c
View File

@ -55,8 +55,6 @@
#define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */
struct BdrvStates bdrv_states = QTAILQ_HEAD_INITIALIZER(bdrv_states);
static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states =
QTAILQ_HEAD_INITIALIZER(graph_bdrv_states);
@ -226,10 +224,7 @@ void bdrv_register(BlockDriver *bdrv)
BlockDriverState *bdrv_new_root(void)
{
BlockDriverState *bs = bdrv_new();
QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list);
return bs;
return bdrv_new();
}
BlockDriverState *bdrv_new(void)
@ -2230,26 +2225,10 @@ void bdrv_close_all(void)
}
}
/* Note that bs->device_list.tqe_prev is initially null,
* and gets set to non-null by QTAILQ_INSERT_TAIL(). Establish
* the useful invariant "bs in bdrv_states iff bs->tqe_prev" by
* resetting it to null on remove. */
void bdrv_device_remove(BlockDriverState *bs)
{
QTAILQ_REMOVE(&bdrv_states, bs, device_list);
bs->device_list.tqe_prev = NULL;
}
/* make a BlockDriverState anonymous by removing from bdrv_state and
* graph_bdrv_state list.
Also, NULL terminate the device_name to prevent double remove */
/* make a BlockDriverState anonymous by removing from graph_bdrv_state list.
* Also, NULL terminate the device_name to prevent double remove */
void bdrv_make_anon(BlockDriverState *bs)
{
/* Take care to remove bs from bdrv_states only when it's actually
* in it. */
if (bs->device_list.tqe_prev) {
bdrv_device_remove(bs);
}
if (bs->node_name[0] != '\0') {
QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list);
}
@ -2286,10 +2265,6 @@ static void change_parent_backing_link(BlockDriverState *from,
}
if (from->blk) {
blk_set_bs(from->blk, to);
if (!to->device_list.tqe_prev) {
QTAILQ_INSERT_BEFORE(from, to, device_list);
}
bdrv_device_remove(from);
}
}

7
blockdev.c
View File

@ -2426,11 +2426,6 @@ void qmp_x_blockdev_remove_medium(const char *device, Error **errp)
goto out;
}
/* This follows the convention established by bdrv_make_anon() */
if (bs->device_list.tqe_prev) {
bdrv_device_remove(bs);
}
blk_remove_bs(blk);
if (!blk_dev_has_tray(blk)) {
@ -2478,8 +2473,6 @@ static void qmp_blockdev_insert_anon_medium(const char *device,
blk_insert_bs(blk, bs);
QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list);
if (!blk_dev_has_tray(blk)) {
/* For tray-less devices, blockdev-close-tray is a no-op (or may not be
* called at all); therefore, the medium needs to be pushed into the

1
include/block/block.h
View File

@ -201,7 +201,6 @@ int bdrv_create(BlockDriver *drv, const char* filename,
int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp);
BlockDriverState *bdrv_new_root(void);
BlockDriverState *bdrv_new(void);
void bdrv_device_remove(BlockDriverState *bs);
void bdrv_make_anon(BlockDriverState *bs);
void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
void bdrv_replace_in_backing_chain(BlockDriverState *old,

4
include/block/block_int.h
View File

@ -442,8 +442,6 @@ struct BlockDriverState {
char node_name[32];
/* element of the list of named nodes building the graph */
QTAILQ_ENTRY(BlockDriverState) node_list;
/* element of the list of "drives" the guest sees */
QTAILQ_ENTRY(BlockDriverState) device_list;
/* element of the list of all BlockDriverStates (all_bdrv_states) */
QTAILQ_ENTRY(BlockDriverState) bs_list;
/* element of the list of monitor-owned BDS */
@ -501,8 +499,6 @@ extern BlockDriver bdrv_file;
extern BlockDriver bdrv_raw;
extern BlockDriver bdrv_qcow2;
extern QTAILQ_HEAD(BdrvStates, BlockDriverState) bdrv_states;
/**
* bdrv_setup_io_funcs:
*