From dd7f33dff7cdf1d3481936560a1a1db285856eeb Mon Sep 17 00:00:00 2001 From: Jeffrey Cody Date: Fri, 19 Sep 2014 03:18:58 +0200 Subject: [PATCH 3/4] block: add backing-file option to block-stream Message-id: <5b8611fab581db6b4c5eb31c998378090819268d.1411096194.git.jcody@redhat.com> Patchwork-id: 61312 O-Subject: [PATCH qemu-kvm-rhev RHEL7.0.z 3/4] block: add backing-file option to block-stream Bugzilla: 1122925 RH-Acked-by: Kevin Wolf RH-Acked-by: Eric Blake RH-Acked-by: Stefan Hajnoczi On some image chains, QEMU may not always be able to resolve the filenames properly, when updating the backing file of an image after a block job. For instance, certain relative pathnames may fail, or drives may have been specified originally by file descriptor (e.g. /dev/fd/???), or a relative protocol pathname may have been used. In these instances, QEMU may lack the information to be able to make the correct choice, but the user or management layer most likely does have that knowledge. With this extension to the block-stream api, the user is able to change the backing file of the active layer as part of the block-stream operation. This allows the change to be 'safe', in the sense that if the attempt to write the active image metadata fails, then the block-stream operation returns failure, without disrupting the guest. If a backing file string is not specified in the command, the backing file string to use is determined in the same manner as it was previously. Reviewed-by: Eric Blake Signed-off-by: Jeff Cody Signed-off-by: Stefan Hajnoczi (cherry picked from commit 13d8cc515dfcf5574077f964332d34890c0101d0) Conflicts: block/stream.c blockdev.c qapi/block-core.json RHEL7 Notes: Conflicts due to: surrounding context differences, and and the qapi json not being split into separate files like upstream. Also upstream used 1024 for local backing file string size, and downstream we already use PATH_MAX instead. Signed-off-by: Jeff Cody Signed-off-by: Miroslav Rezanina --- block/stream.c | 11 +++++------ blockdev.c | 23 +++++++++++++++++++---- hmp.c | 2 +- qapi-schema.json | 19 +++++++++++++++++-- qmp-commands.hx | 2 +- 5 files changed, 43 insertions(+), 14 deletions(-) diff --git a/block/stream.c b/block/stream.c index 2a6f533..367120d 100644 --- a/block/stream.c +++ b/block/stream.c @@ -32,7 +32,7 @@ typedef struct StreamBlockJob { RateLimit limit; BlockDriverState *base; BlockdevOnError on_error; - char backing_file_id[PATH_MAX]; + char *backing_file_str; } StreamBlockJob; static int coroutine_fn stream_populate(BlockDriverState *bs, @@ -182,7 +182,7 @@ wait: if (!block_job_is_cancelled(&s->common) && sector_num == end && ret == 0) { const char *base_id = NULL, *base_fmt = NULL; if (base) { - base_id = s->backing_file_id; + base_id = s->backing_file_str; if (base->drv) { base_fmt = base->drv->format_name; } @@ -192,6 +192,7 @@ wait: } qemu_vfree(buf); + g_free(s->backing_file_str); block_job_completed(&s->common, ret); } @@ -213,7 +214,7 @@ static const BlockJobDriver stream_job_driver = { }; void stream_start(BlockDriverState *bs, BlockDriverState *base, - const char *base_id, int64_t speed, + const char *backing_file_str, int64_t speed, BlockdevOnError on_error, BlockDriverCompletionFunc *cb, void *opaque, Error **errp) @@ -233,9 +234,7 @@ void stream_start(BlockDriverState *bs, BlockDriverState *base, } s->base = base; - if (base_id) { - pstrcpy(s->backing_file_id, sizeof(s->backing_file_id), base_id); - } + s->backing_file_str = g_strdup(backing_file_str); s->on_error = on_error; s->common.co = qemu_coroutine_create(stream_run); diff --git a/blockdev.c b/blockdev.c index b22b42e..c4fb129 100644 --- a/blockdev.c +++ b/blockdev.c @@ -1425,14 +1425,17 @@ static void block_job_cb(void *opaque, int ret) bdrv_put_ref_bh_schedule(bs); } -void qmp_block_stream(const char *device, bool has_base, - const char *base, bool has_speed, int64_t speed, +void qmp_block_stream(const char *device, + bool has_base, const char *base, + bool has_backing_file, const char *backing_file, + bool has_speed, int64_t speed, bool has_on_error, BlockdevOnError on_error, Error **errp) { BlockDriverState *bs; BlockDriverState *base_bs = NULL; Error *local_err = NULL; + const char *base_name = NULL; if (!has_on_error) { on_error = BLOCKDEV_ON_ERROR_REPORT; @@ -1444,15 +1447,27 @@ void qmp_block_stream(const char *device, bool has_base, return; } - if (base) { + if (has_base) { base_bs = bdrv_find_backing_image(bs, base); if (base_bs == NULL) { error_set(errp, QERR_BASE_NOT_FOUND, base); return; } + base_name = base; } - stream_start(bs, base_bs, base, has_speed ? speed : 0, + /* if we are streaming the entire chain, the result will have no backing + * file, and specifying one is therefore an error */ + if (base_bs == NULL && has_backing_file) { + error_setg(errp, "backing file specified, but streaming the " + "entire chain"); + return; + } + + /* backing_file string overrides base bs filename */ + base_name = has_backing_file ? backing_file : base_name; + + stream_start(bs, base_bs, base_name, has_speed ? speed : 0, on_error, block_job_cb, bs, &local_err); if (error_is_set(&local_err)) { error_propagate(errp, local_err); diff --git a/hmp.c b/hmp.c index 841929d..b723b26 100644 --- a/hmp.c +++ b/hmp.c @@ -1046,7 +1046,7 @@ void hmp_block_stream(Monitor *mon, const QDict *qdict) const char *base = qdict_get_try_str(qdict, "base"); int64_t speed = qdict_get_try_int(qdict, "speed", 0); - qmp_block_stream(device, base != NULL, base, + qmp_block_stream(device, base != NULL, base, false, NULL, qdict_haskey(qdict, "speed"), speed, BLOCKDEV_ON_ERROR_REPORT, true, &error); diff --git a/qapi-schema.json b/qapi-schema.json index 100b059..e11b641 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -2274,6 +2274,21 @@ # # @base: #optional the common backing file name # +# @backing-file: #optional The backing file string to write into the active +# layer. This filename is not validated. +# +# If a pathname string is such that it cannot be +# resolved by QEMU, that means that subsequent QMP or +# HMP commands must use node-names for the image in +# question, as filename lookup methods will fail. +# +# If not specified, QEMU will automatically determine +# the backing file string to use, or error out if there +# is no obvious choice. Care should be taken when +# specifying the string, to specify a valid filename or +# protocol. +# (Since 2.1) +# # @speed: #optional the maximum speed, in bytes per second # # @on-error: #optional the action to take on an error (default report). @@ -2286,8 +2301,8 @@ # Since: 1.1 ## { 'command': 'block-stream', - 'data': { 'device': 'str', '*base': 'str', '*speed': 'int', - '*on-error': 'BlockdevOnError' } } + 'data': { 'device': 'str', '*base': 'str', '*backing-file': 'str', + '*speed': 'int', '*on-error': 'BlockdevOnError' } } #_end-rhev-only ## diff --git a/qmp-commands.hx b/qmp-commands.hx index 79006c5..94f8671 100644 --- a/qmp-commands.hx +++ b/qmp-commands.hx @@ -999,7 +999,7 @@ EQMP #ifdef CONFIG_LIVE_BLOCK_OPS { .name = "block-stream", - .args_type = "device:B,base:s?,speed:o?,on-error:s?", + .args_type = "device:B,base:s?,speed:o?,backing-file:s?,on-error:s?", .mhandler.cmd_new = qmp_marshal_input_block_stream, }, -- 1.7.1