From 6af72274efd580fbfc048aad75d3e9af44614590 Mon Sep 17 00:00:00 2001 From: Vladimir Sementsov-Ogievskiy Date: Thu, 15 Jul 2021 15:48:53 +0300 Subject: [PATCH] block/vvfat: fix: drop backing Most probably this fake backing child doesn't work anyway (see notes about it in a8a4d15c1c34d). Still, since 25f78d9e2de528473d52 drivers are required to set .supports_backing if they want to call bdrv_set_backing_hd, so now vvfat just doesn't work because of this check. Let's finally drop this fake backing file. Fixes: 25f78d9e2de528473d52acfcf7acdfb64e3453d4 Signed-off-by: Vladimir Sementsov-Ogievskiy Message-Id: <20210715124853.13335-1-vsementsov@virtuozzo.com> Tested-by: John Arbuckle Signed-off-by: Kevin Wolf --- block/vvfat.c | 43 ++++--------------------------------------- 1 file changed, 4 insertions(+), 39 deletions(-) diff --git a/block/vvfat.c b/block/vvfat.c index ae9d387da7..34bf1e3a86 100644 --- a/block/vvfat.c +++ b/block/vvfat.c @@ -3098,26 +3098,6 @@ static int coroutine_fn vvfat_co_block_status(BlockDriverState *bs, return BDRV_BLOCK_DATA; } -static int coroutine_fn -write_target_commit(BlockDriverState *bs, uint64_t offset, uint64_t bytes, - QEMUIOVector *qiov, int flags) -{ - int ret; - - BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque); - qemu_co_mutex_lock(&s->lock); - ret = try_commit(s); - qemu_co_mutex_unlock(&s->lock); - - return ret; -} - -static BlockDriver vvfat_write_target = { - .format_name = "vvfat_write_target", - .instance_size = sizeof(void*), - .bdrv_co_pwritev = write_target_commit, -}; - static void vvfat_qcow_options(BdrvChildRole role, bool parent_is_format, int *child_flags, QDict *child_options, int parent_flags, QDict *parent_options) @@ -3133,7 +3113,6 @@ static int enable_write_target(BlockDriverState *bs, Error **errp) { BDRVVVFATState *s = bs->opaque; BlockDriver *bdrv_qcow = NULL; - BlockDriverState *backing; QemuOpts *opts = NULL; int ret; int size = sector2cluster(s, s->sector_count); @@ -3184,13 +3163,6 @@ static int enable_write_target(BlockDriverState *bs, Error **errp) unlink(s->qcow_filename); #endif - backing = bdrv_new_open_driver(&vvfat_write_target, NULL, BDRV_O_ALLOW_RDWR, - &error_abort); - *(void**) backing->opaque = s; - - bdrv_set_backing_hd(s->bs, backing, &error_abort); - bdrv_unref(backing); - return 0; err: @@ -3205,17 +3177,10 @@ static void vvfat_child_perm(BlockDriverState *bs, BdrvChild *c, uint64_t perm, uint64_t shared, uint64_t *nperm, uint64_t *nshared) { - if (role & BDRV_CHILD_DATA) { - /* This is a private node, nobody should try to attach to it */ - *nperm = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE; - *nshared = BLK_PERM_WRITE_UNCHANGED; - } else { - assert(role & BDRV_CHILD_COW); - /* The backing file is there so 'commit' can use it. vvfat doesn't - * access it in any way. */ - *nperm = 0; - *nshared = BLK_PERM_ALL; - } + assert(role & BDRV_CHILD_DATA); + /* This is a private node, nobody should try to attach to it */ + *nperm = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE; + *nshared = BLK_PERM_WRITE_UNCHANGED; } static void vvfat_close(BlockDriverState *bs)