From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45294) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YqlzX-0003G2-VF for qemu-devel@nongnu.org; Fri, 08 May 2015 13:23:20 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YqlzW-0004zX-RC for qemu-devel@nongnu.org; Fri, 08 May 2015 13:23:15 -0400 From: Kevin Wolf Date: Fri, 8 May 2015 19:22:00 +0200 Message-Id: <1431105726-3682-29-git-send-email-kwolf@redhat.com> In-Reply-To: <1431105726-3682-1-git-send-email-kwolf@redhat.com> References: <1431105726-3682-1-git-send-email-kwolf@redhat.com> Subject: [Qemu-devel] [PATCH 28/34] block: Introduce bs->explicit_options List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-block@nongnu.org Cc: kwolf@redhat.com, qemu-devel@nongnu.org, armbru@redhat.com, mreitz@redhat.com bs->options doesn't only contain options that the user explicitly requested, but also option that were derived from flags, the filename or inherited from the parent node. For reopen, it is important to know the difference because reopening the parent can change inherited values in child nodes, but it shouldn't change any options that were explicitly specified for the child. Signed-off-by: Kevin Wolf --- block.c | 20 ++++++++++++++++++-- include/block/block.h | 1 + include/block/block_int.h | 1 + 3 files changed, 20 insertions(+), 2 deletions(-) diff --git a/block.c b/block.c index 9259b42..d76e385 100644 --- a/block.c +++ b/block.c @@ -1408,6 +1408,7 @@ static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, if (options == NULL) { options = qdict_new(); } + bs->explicit_options = qdict_clone_shallow(options); if (child_role) { bs->inherits_from = parent; @@ -1559,6 +1560,7 @@ fail: if (file != NULL) { bdrv_unref(file); } + QDECREF(bs->explicit_options); QDECREF(bs->options); QDECREF(options); bs->options = NULL; @@ -1634,7 +1636,7 @@ static BlockReopenQueue *bdrv_reopen_queue_child(BlockReopenQueue *bs_queue, BlockReopenQueueEntry *bs_entry; BdrvChild *child; - QDict *old_options; + QDict *old_options, *explicit_options; if (bs_queue == NULL) { bs_queue = g_new0(BlockReopenQueue, 1); @@ -1649,11 +1651,18 @@ static BlockReopenQueue *bdrv_reopen_queue_child(BlockReopenQueue *bs_queue, * Precedence of options: * 1. Explicitly passed in options (highest) * 2. TODO Set in flags (only for top level) - * 3. TODO Retained from explicitly set options of bs + * 3. Retained from explicitly set options of bs * 4. Inherited from parent node * 5. Retained from effective options of bs */ + /* Old explicitly set values (don't overwrite by inherited value) */ + old_options = qdict_clone_shallow(bs->explicit_options); + qdict_join(options, old_options, false); + QDECREF(old_options); + + explicit_options = qdict_clone_shallow(options); + /* Inherit from parent node */ if (parent_options) { assert(!flags); @@ -1692,6 +1701,7 @@ static BlockReopenQueue *bdrv_reopen_queue_child(BlockReopenQueue *bs_queue, bs_entry->state.bs = bs; bs_entry->state.options = options; + bs_entry->state.explicit_options = explicit_options; bs_entry->state.flags = flags; return bs_queue; @@ -1886,6 +1896,9 @@ void bdrv_reopen_commit(BDRVReopenState *reopen_state) } /* set BDS specific flags now */ + QDECREF(reopen_state->bs->explicit_options); + + reopen_state->bs->explicit_options = reopen_state->explicit_options; reopen_state->bs->open_flags = reopen_state->flags; reopen_state->bs->enable_write_cache = !!(reopen_state->flags & BDRV_O_CACHE_WB); @@ -1909,6 +1922,8 @@ void bdrv_reopen_abort(BDRVReopenState *reopen_state) if (drv->bdrv_reopen_abort) { drv->bdrv_reopen_abort(reopen_state); } + + QDECREF(reopen_state->explicit_options); } @@ -1952,6 +1967,7 @@ void bdrv_close(BlockDriverState *bs) bs->sg = 0; bs->zero_beyond_eof = false; QDECREF(bs->options); + QDECREF(bs->explicit_options); bs->options = NULL; QDECREF(bs->full_open_options); bs->full_open_options = NULL; diff --git a/include/block/block.h b/include/block/block.h index 1287013..08bd0fe 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -147,6 +147,7 @@ typedef struct BDRVReopenState { BlockDriverState *bs; int flags; QDict *options; + QDict *explicit_options; void *opaque; } BDRVReopenState; diff --git a/include/block/block_int.h b/include/block/block_int.h index 1cae8d4..a2e96bb 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -443,6 +443,7 @@ struct BlockDriverState { QLIST_HEAD(, BdrvChild) children; QDict *options; + QDict *explicit_options; BlockdevDetectZeroesOptions detect_zeroes; /* The error object in use for blocking operations on backing_hd */ -- 1.8.3.1