From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36502) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZV9rb-0007wp-Ey for qemu-devel@nongnu.org; Thu, 27 Aug 2015 22:58:00 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZV9rX-0006Wo-ED for qemu-devel@nongnu.org; Thu, 27 Aug 2015 22:57:59 -0400 Received: from mail-io0-x22f.google.com ([2607:f8b0:4001:c06::22f]:33347) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZV9rX-0006Wj-7S for qemu-devel@nongnu.org; Thu, 27 Aug 2015 22:57:55 -0400 Received: by iods203 with SMTP id s203so79340533iod.0 for ; Thu, 27 Aug 2015 19:57:54 -0700 (PDT) From: Liu Yuan Date: Fri, 28 Aug 2015 10:53:58 +0800 Message-Id: <1440730438-24676-1-git-send-email-namei.unix@gmail.com> Subject: [Qemu-devel] [PATCH v3] sheepdog: add reopen support List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: sheepdog-ng@googlegroups.com Cc: Kevin Wolf , Jeff Cody , qemu-devel@nongnu.org, Stefan Hajnoczi From: Liu Yuan With reopen supported, block-commit (and offline commit) is now supported for image files whose base image uses the Sheepdog protocol driver. Cc: qemu-devel@nongnu.org Cc: Jeff Cody Cc: Kevin Wolf Cc: Stefan Hajnoczi Signed-off-by: Liu Yuan --- v3: - init cache flags in sd_reopen_prepare() as in sd_open() v2: - free AioHandler [Jeff Cody] block/sheepdog.c | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) diff --git a/block/sheepdog.c b/block/sheepdog.c index 9585beb..6e8a783 100644 --- a/block/sheepdog.c +++ b/block/sheepdog.c @@ -377,6 +377,11 @@ typedef struct BDRVSheepdogState { QLIST_HEAD(inflight_aiocb_head, SheepdogAIOCB) inflight_aiocb_head; } BDRVSheepdogState; +typedef struct BDRVSheepdogReopenState { + int fd; + int cache_flags; +} BDRVSheepdogReopenState; + static const char * sd_strerror(int err) { int i; @@ -1486,6 +1491,68 @@ out: return ret; } +static int sd_reopen_prepare(BDRVReopenState *state, BlockReopenQueue *queue, + Error **errp) +{ + BDRVSheepdogState *s = state->bs->opaque; + BDRVSheepdogReopenState *re_s; + int ret = 0; + + re_s = state->opaque = g_new0(BDRVSheepdogReopenState, 1); + + re_s->cache_flags = SD_FLAG_CMD_CACHE; + if (state->flags & BDRV_O_NOCACHE) { + re_s->cache_flags = SD_FLAG_CMD_DIRECT; + } + + re_s->fd = get_sheep_fd(s, errp); + if (re_s->fd < 0) { + ret = re_s->fd; + return ret; + } + + return ret; +} + +static void sd_reopen_commit(BDRVReopenState *state) +{ + BDRVSheepdogReopenState *re_s = state->opaque; + BDRVSheepdogState *s = state->bs->opaque; + + if (s->fd) { + aio_set_fd_handler(s->aio_context, s->fd, NULL, NULL, NULL); + closesocket(s->fd); + } + + s->fd = re_s->fd; + s->cache_flags = re_s->cache_flags; + + g_free(state->opaque); + state->opaque = NULL; + + return; +} + +static void sd_reopen_abort(BDRVReopenState *state) +{ + BDRVSheepdogReopenState *re_s = state->opaque; + BDRVSheepdogState *s = state->bs->opaque; + + if (re_s == NULL) { + return; + } + + if (re_s->fd) { + aio_set_fd_handler(s->aio_context, re_s->fd, NULL, NULL, NULL); + closesocket(re_s->fd); + } + + g_free(state->opaque); + state->opaque = NULL; + + return; +} + static int do_sd_create(BDRVSheepdogState *s, uint32_t *vdi_id, int snapshot, Error **errp) { @@ -2703,6 +2770,9 @@ static BlockDriver bdrv_sheepdog = { .instance_size = sizeof(BDRVSheepdogState), .bdrv_needs_filename = true, .bdrv_file_open = sd_open, + .bdrv_reopen_prepare = sd_reopen_prepare, + .bdrv_reopen_commit = sd_reopen_commit, + .bdrv_reopen_abort = sd_reopen_abort, .bdrv_close = sd_close, .bdrv_create = sd_create, .bdrv_has_zero_init = bdrv_has_zero_init_1, @@ -2736,6 +2806,9 @@ static BlockDriver bdrv_sheepdog_tcp = { .instance_size = sizeof(BDRVSheepdogState), .bdrv_needs_filename = true, .bdrv_file_open = sd_open, + .bdrv_reopen_prepare = sd_reopen_prepare, + .bdrv_reopen_commit = sd_reopen_commit, + .bdrv_reopen_abort = sd_reopen_abort, .bdrv_close = sd_close, .bdrv_create = sd_create, .bdrv_has_zero_init = bdrv_has_zero_init_1, @@ -2769,6 +2842,9 @@ static BlockDriver bdrv_sheepdog_unix = { .instance_size = sizeof(BDRVSheepdogState), .bdrv_needs_filename = true, .bdrv_file_open = sd_open, + .bdrv_reopen_prepare = sd_reopen_prepare, + .bdrv_reopen_commit = sd_reopen_commit, + .bdrv_reopen_abort = sd_reopen_abort, .bdrv_close = sd_close, .bdrv_create = sd_create, .bdrv_has_zero_init = bdrv_has_zero_init_1, -- 1.9.1