diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/copy-before-write.c | 69 |
1 files changed, 41 insertions, 28 deletions
diff --git a/block/copy-before-write.c b/block/copy-before-write.c index adbbc64aa9..a4fee645fd 100644 --- a/block/copy-before-write.c +++ b/block/copy-before-write.c @@ -144,6 +144,45 @@ static void cbw_child_perm(BlockDriverState *bs, BdrvChild *c, } } +static int cbw_init(BlockDriverState *top, BlockDriverState *source, + BlockDriverState *target, bool compress, Error **errp) +{ + BDRVCopyBeforeWriteState *state = top->opaque; + + top->total_sectors = source->total_sectors; + top->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED | + (BDRV_REQ_FUA & source->supported_write_flags); + top->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED | + ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) & + source->supported_zero_flags); + + bdrv_ref(target); + state->target = bdrv_attach_child(top, target, "target", &child_of_bds, + BDRV_CHILD_DATA, errp); + if (!state->target) { + error_prepend(errp, "Cannot attach target child: "); + return -EINVAL; + } + + bdrv_ref(source); + top->file = bdrv_attach_child(top, source, "file", &child_of_bds, + BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, + errp); + if (!top->file) { + error_prepend(errp, "Cannot attach file child: "); + return -EINVAL; + } + + state->bcs = block_copy_state_new(top->file, state->target, false, compress, + errp); + if (!state->bcs) { + error_prepend(errp, "Cannot create block-copy-state: "); + return -EINVAL; + } + + return 0; +} + BlockDriver bdrv_cbw_filter = { .format_name = "copy-before-write", .instance_size = sizeof(BDRVCopyBeforeWriteState), @@ -181,36 +220,10 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source, error_prepend(errp, "Cannot open driver: "); return NULL; } - state = top->opaque; - top->total_sectors = source->total_sectors; - top->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED | - (BDRV_REQ_FUA & source->supported_write_flags); - top->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED | - ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) & - source->supported_zero_flags); - - bdrv_ref(target); - state->target = bdrv_attach_child(top, target, "target", &child_of_bds, - BDRV_CHILD_DATA, errp); - if (!state->target) { - error_prepend(errp, "Cannot attach target child: "); - goto fail; - } - bdrv_ref(source); - top->file = bdrv_attach_child(top, source, "file", &child_of_bds, - BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, - errp); - if (!top->file) { - error_prepend(errp, "Cannot attach file child: "); - goto fail; - } - - state->bcs = block_copy_state_new(top->file, state->target, false, compress, - errp); - if (!state->bcs) { - error_prepend(errp, "Cannot create block-copy-state: "); + ret = cbw_init(top, source, target, compress, errp); + if (ret < 0) { goto fail; } |