From patchwork Thu Jan 31 08:53:48 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wayne Xia X-Patchwork-Id: 217129 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 7F3D42C0091 for ; Thu, 31 Jan 2013 19:57:31 +1100 (EST) Received: from localhost ([::1]:44593 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1U0pxZ-0005n6-NZ for incoming@patchwork.ozlabs.org; Thu, 31 Jan 2013 03:57:29 -0500 Received: from eggs.gnu.org ([208.118.235.92]:38931) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1U0pwC-0003RA-QY for qemu-devel@nongnu.org; Thu, 31 Jan 2013 03:56:07 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1U0pw8-0003jD-5Z for qemu-devel@nongnu.org; Thu, 31 Jan 2013 03:56:04 -0500 Received: from e23smtp09.au.ibm.com ([202.81.31.142]:47986) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1U0pw6-0003iv-Si for qemu-devel@nongnu.org; Thu, 31 Jan 2013 03:56:00 -0500 Received: from /spool/local by e23smtp09.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Thu, 31 Jan 2013 18:49:24 +1000 Received: from d23relay04.au.ibm.com (d23relay04.au.ibm.com [9.190.234.120]) by d23dlp03.au.ibm.com (Postfix) with ESMTP id 6B3FC357804F for ; Thu, 31 Jan 2013 19:55:53 +1100 (EST) Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay04.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r0V8hvg93211550 for ; Thu, 31 Jan 2013 19:43:57 +1100 Received: from d23av03.au.ibm.com (loopback [127.0.0.1]) by d23av03.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r0V8tq6W013433 for ; Thu, 31 Jan 2013 19:55:52 +1100 Received: from RH63Wenchao (wenchaox.cn.ibm.com [9.115.122.102]) by d23av03.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id r0V8rvOT010911; Thu, 31 Jan 2013 19:55:51 +1100 From: Wenchao Xia To: qemu-devel@nongnu.org Date: Thu, 31 Jan 2013 16:53:48 +0800 Message-Id: <1359622430-3936-9-git-send-email-xiawenc@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1359622430-3936-1-git-send-email-xiawenc@linux.vnet.ibm.com> References: <1359622430-3936-1-git-send-email-xiawenc@linux.vnet.ibm.com> X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13013108-3568-0000-0000-0000031951E3 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] X-Received-From: 202.81.31.142 Cc: kwolf@redhat.com, pbonzini@redhat.com, aliguori@us.ibm.com, Wenchao Xia , stefanha@gmail.com Subject: [Qemu-devel] [PATCH V17 08/10] libqblock: libqblock API implement X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org This patch contains implemention for APIs. Basically it is a layer above qemu block general layer now. qb_context_new() will try do init for this library. Signed-off-by: Wenchao Xia --- libqblock/libqblock-error.c | 60 +++ libqblock/libqblock.c | 1092 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 1152 insertions(+), 0 deletions(-) diff --git a/libqblock/libqblock-error.c b/libqblock/libqblock-error.c index e69de29..c1781ff 100644 --- a/libqblock/libqblock-error.c +++ b/libqblock/libqblock-error.c @@ -0,0 +1,60 @@ +/* + * QEMU block layer library + * + * Copyright IBM, Corp. 2013 + * + * Authors: + * Wenchao Xia + * + * This work is licensed under the terms of the GNU LGPL, version 2 or later. + * See the COPYING.LIB file in the top-level directory. + * + */ + +#include "libqblock-error.h" +#include "libqblock-internal.h" + +void qb_error_get_human_str(QBlockContext *context, + char *buf, size_t buf_size) +{ + const char *err_ret_str; + switch (context->err_ret) { + case QB_ERR_INTERNAL_ERR: + err_ret_str = "Internal error."; + break; + case QB_ERR_FATAL_ERR: + err_ret_str = "Fatal error."; + break; + case QB_ERR_INVALID_PARAM: + err_ret_str = "Invalid param."; + break; + case QB_ERR_BLOCK_OUT_OF_RANGE: + err_ret_str = "request is out of image's range."; + break; + default: + err_ret_str = "Unknown error."; + break; + } + if (context == NULL) { + snprintf(buf, buf_size, "%s", err_ret_str); + return; + } + + if (context->err_ret == QB_ERR_INTERNAL_ERR) { + snprintf(buf, buf_size, "%s %s errno [%d]. strerror [%s].", + err_ret_str, context->g_error->message, + context->err_no, strerror(-context->err_no)); + } else { + snprintf(buf, buf_size, "%s %s", + err_ret_str, context->g_error->message); + } + return; +} + +int qb_error_get_errno(QBlockContext *context) +{ + if (context->err_ret == QB_ERR_INTERNAL_ERR) { + return context->err_no; + } + return 0; +} diff --git a/libqblock/libqblock.c b/libqblock/libqblock.c index e69de29..90c8729 100644 --- a/libqblock/libqblock.c +++ b/libqblock/libqblock.c @@ -0,0 +1,1092 @@ +/* + * QEMU block layer library + * + * Copyright IBM, Corp. 2013 + * + * Authors: + * Wenchao Xia + * + * This work is licensed under the terms of the GNU LGPL, version 2 or later. + * See the COPYING.LIB file in the top-level directory. + * + */ + +#include +#include +#include + +#include "libqblock.h" +#include "libqblock-internal.h" + +#include "block/block_int.h" + +#define LIBQB_FILENAME_MAX 4096 + +typedef struct LibqblockGlobalData { + int init_flag; + pthread_mutex_t mutex; +} LibqblockGlobalData; + +LibqblockGlobalData libqb_global_data; + +typedef struct LibqbFormatStrMapping { + const char *fmt_str; + QBlockFormat fmt_type; +} LibqbFormatStrMapping; + +LibqbFormatStrMapping libqb_formatstr_table[] = { + {"cow", QB_FORMAT_COW}, + {"qed", QB_FORMAT_QED}, + {"qcow", QB_FORMAT_QCOW}, + {"qcow2", QB_FORMAT_QCOW2}, + {"raw", QB_FORMAT_RAW}, + {"rbd", QB_FORMAT_RBD}, + {"sheepdog", QB_FORMAT_SHEEPDOG}, + {"vdi", QB_FORMAT_VDI}, + {"vmdk", QB_FORMAT_VMDK}, + {"vpc", QB_FORMAT_VPC}, + {NULL, 0}, +}; + +__attribute__((constructor)) +static void libqblock_init(void) +{ + /* Todo: add an assertion about the ABI. */ + libqb_global_data.init_flag = 0; + pthread_mutex_init(&libqb_global_data.mutex, NULL); +} + +const char *qb_formattype2str(QBlockFormat fmt_type) +{ + int i = 0; + LibqbFormatStrMapping *tb = libqb_formatstr_table; + + if ((fmt_type <= QB_FORMAT_NONE) || (fmt_type >= QB_FORMAT_MAX)) { + return NULL; + } + while (tb[i].fmt_str != NULL) { + if (tb[i].fmt_type == fmt_type) { + return tb[i].fmt_str; + } + i++; + } + return NULL; +} + +QBlockFormat qb_str2fmttype(const char *fmt_str) +{ + int i = 0; + LibqbFormatStrMapping *tb = libqb_formatstr_table; + + if (fmt_str == NULL) { + return QB_FORMAT_NONE; + } + while (tb[i].fmt_str != NULL) { + if ((strcmp(fmt_str, tb[i].fmt_str) == 0)) { + return tb[i].fmt_type; + } + i++; + } + return QB_FORMAT_NONE; +} + +static void set_context_err(QBlockContext *context, int err_ret, + const char *fmt, ...) +{ + va_list ap; + + if (context->g_error != NULL) { + g_error_free(context->g_error); + } + + va_start(ap, fmt); + context->g_error = g_error_new_valist(G_LIBQBLOCK_ERROR, err_ret, fmt, ap); + va_end(ap); + + context->err_ret = err_ret; + if (err_ret == QB_ERR_INTERNAL_ERR) { + context->err_no = -errno; + } else { + context->err_no = 0; + } +} + +int qb_context_new(QBlockContext **p_context) +{ + /* + * library init comes here, to make sure block_init is called before with + * flag __attribute__((constructor)). + */ + if (pthread_mutex_lock(&libqb_global_data.mutex)) { + return QB_ERR_FATAL_ERR; + } + if (libqb_global_data.init_flag == 0) { + qemu_init_main_loop(); + bdrv_init(); + libqb_global_data.init_flag = 1; + } + if (pthread_mutex_unlock(&libqb_global_data.mutex)) { + return QB_ERR_FATAL_ERR; + } + + *p_context = g_malloc0(sizeof(QBlockContext)); + /* AIO code could comes here later. */ + return 0; +} + +void qb_context_delete(QBlockContext **p_context) +{ + if ((*p_context)->g_error != NULL) { + g_error_free((*p_context)->g_error); + } + QB_FREE(*p_context); + return; +} + +int qb_image_new(QBlockContext *context, + QBlockImage **p_qbi) +{ + *p_qbi = g_malloc0_n(1, sizeof(QBlockImage)); + (*p_qbi)->bdrvs = bdrv_new("hda"); + if ((*p_qbi)->bdrvs == NULL) { + QB_FREE(*p_qbi); + set_context_err(context, QB_ERR_INTERNAL_ERR, + "failed to create the driver."); + return context->err_ret; + } + (*p_qbi)->ref_count = 1; + return 0; +} + +void qb_image_ref(QBlockContext *context, + QBlockImage **p_qbi) +{ + (*p_qbi)->ref_count++; +} + +void qb_image_unref(QBlockContext *context, + QBlockImage **p_qbi) +{ + (*p_qbi)->ref_count--; + if ((*p_qbi)->ref_count > 0) { + return; + } + if ((*p_qbi)->filename != NULL) { + qb_close(context, *p_qbi); + } + if ((*p_qbi)->bdrvs != NULL) { + bdrv_delete((*p_qbi)->bdrvs); + (*p_qbi)->bdrvs = NULL; + } + QB_FREE(*p_qbi); + return; +} + +int qb_location_info_new(QBlockContext *context, + QBlockLocationInfo **p_loc) +{ + *p_loc = g_malloc0_n(1, sizeof(QBlockLocationInfo)); + return 0; +} + +void qb_location_info_delete(QBlockContext *context, + QBlockLocationInfo **p_loc) +{ + QB_FREE(*p_loc); +} + +int qb_format_info_new(QBlockContext *context, + QBlockFormatInfo **p_fmt) +{ + *p_fmt = g_malloc0_n(1, sizeof(QBlockFormatInfo)); + return 0; +} + +void qb_format_info_delete(QBlockContext *context, + QBlockFormatInfo **p_fmt) +{ + QB_FREE(*p_fmt); +} + +/* return 0 if every thing is fine */ +static int loc_check_params(QBlockContext *context, + QBlockLocationInfo *loc) +{ + context->err_ret = 0; + + switch (loc->prot_type) { + case QB_PROTO_FILE: + if (loc->o_file.filename == NULL) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "Filename was not set."); + goto out; + } + if (path_has_protocol(loc->o_file.filename) > 0) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "filename [%s] had protocol.", + loc->o_file.filename); + goto out; + } + break; + default: + set_context_err(context, QB_ERR_INVALID_PARAM, + "Protocol type [%d] was not valid.", + loc->prot_type); + break; + } + + out: + return context->err_ret; +} + +/* translate loc structure to internal filename, returned char* need free, + * assuming filename is not NULL. *filename would be set to NULL if no valid + * filename found. *filename must be freed later. + * return 0 if no error with *filename set. + */ +static int loc2filename(QBlockContext *context, + QBlockLocationInfo *loc, + char **p_filename) +{ + context->err_ret = 0; + + if (*p_filename != NULL) { + QB_FREE(*p_filename); + } + switch (loc->prot_type) { + case QB_PROTO_FILE: + *p_filename = g_strdup(loc->o_file.filename); + break; + default: + set_context_err(context, QB_ERR_INVALID_PARAM, + "protocol type [%d] is not supported.", + loc->prot_type); + break; + } + + return context->err_ret; +} + +/* translate filename to location, loc->prot_type = NONE if fail, filename + must be valid. loc internal char pointer must be freed later. + * return 0 if no error. + */ +static int filename2loc(QBlockContext *context, + QBlockLocationInfo *loc, + const char *filename) +{ + context->err_ret = 0; + + if (path_has_protocol(filename) > 0) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "Filename [%s] had protocol, not supported now.", + filename); + goto out; + } + + loc->prot_type = QB_PROTO_FILE; + switch (loc->prot_type) { + case QB_PROTO_FILE: + loc->o_file.filename = g_strdup(filename); + break; + default: + break; + } + + out: + return context->err_ret; +} + +/* return 0 if OK, or qblock error number */ +static int set_backing_file_options(QBlockContext *context, + QEMUOptionParameter *param, + QBlockLocationInfo *loc, + QBlockFormat *fmt) +{ + char *backing_filename = NULL; + const char *fmtstr_backing = NULL; + int ret = 0; + + if (loc == NULL) { + goto out; + } + + ret = loc2filename(context, loc, &backing_filename); + /* ret can < 0 if loc have not been set, mean user did not specify backing + file, so need to check return value */ + + ret = 0; + + if (backing_filename) { + ret = set_option_parameter(param, + BLOCK_OPT_BACKING_FILE, backing_filename); + assert(ret == 0); + if (fmt == NULL) { + goto out; + } + fmtstr_backing = qb_formattype2str(*fmt); + if (fmtstr_backing) { + ret = set_option_parameter(param, + BLOCK_OPT_BACKING_FMT, fmtstr_backing); + assert(ret == 0); + } + } + + out: + g_free(backing_filename); + return ret; +} + +int qb_create(QBlockContext *context, + QBlockImage *qbi, + QBlockLocationInfo *loc, + QBlockFormatInfo *fmt, + int flag) +{ + int ret = 0, bd_ret; + char *filename = NULL; + BlockDriverState *bs = NULL; + BlockDriver *drv = NULL, *backing_drv = NULL; + bool tmp_bool; + + const char *fmtstr = NULL, *tmp = NULL; + QEMUOptionParameter *param = NULL, *create_options = NULL; + QEMUOptionParameter *backing_fmt, *backing_file, *size; + QBlockFormatOptionsCOW *o_cow = NULL; + QBlockFormatOptionsQED *o_qed = NULL; + QBlockFormatOptionsQCOW *o_qcow = NULL; + QBlockFormatOptionsQCOW2 *o_qcow2 = NULL; + QBlockFormatOptionsRBD *o_rbd = NULL; + QBlockFormatOptionsSD *o_sd = NULL; + QBlockFormatOptionsVDI *o_vdi = NULL; + QBlockFormatOptionsVMDK *o_vmdk = NULL; + QBlockFormatOptionsVPC *o_vpc = NULL; + + + /* check parameters */ + if (flag & (~LIBQBLOCK_O_VALID_MASK)) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "invalid flag was set."); + ret = context->err_ret; + goto out; + } + + if ((loc == NULL) || (qbi == NULL) || (fmt == NULL)) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "Got unexpected NULL pointer in parameters."); + ret = context->err_ret; + goto out; + } + + ret = loc_check_params(context, loc); + if (ret != 0) { + goto out; + } + + /* internal translate */ + ret = loc2filename(context, loc, &filename); + if (ret != 0) { + goto out; + } + + fmtstr = qb_formattype2str(fmt->fmt_type); + if (fmtstr == NULL) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "Got unexpected NULL pointer in parameters."); + ret = context->err_ret; + goto out; + } + + drv = bdrv_find_format(fmtstr); + assert(drv != NULL); + + create_options = append_option_parameters(create_options, + drv->create_options); + param = parse_option_parameters("", create_options, param); + + bd_ret = set_option_parameter_int(param, + BLOCK_OPT_SIZE, fmt->virt_size); + assert(bd_ret == 0); + + switch (fmt->fmt_type) { + case QB_FORMAT_COW: + o_cow = &fmt->o_cow; + /* do not need to check loc, it may be not set */ + ret = set_backing_file_options(context, param, + &o_cow->backing_loc, NULL); + if (ret != 0) { + goto out; + } + break; + case QB_FORMAT_QED: + o_qed = &fmt->o_qed; + ret = set_backing_file_options(context, param, + &o_qed->backing_loc, &o_qed->backing_fmt); + if (ret != 0) { + goto out; + } + bd_ret = set_option_parameter_int(param, + BLOCK_OPT_CLUSTER_SIZE, o_qed->cluster_size); + assert(bd_ret == 0); + bd_ret = set_option_parameter_int(param, + BLOCK_OPT_TABLE_SIZE, o_qed->table_size); + assert(bd_ret == 0); + break; + case QB_FORMAT_QCOW: + o_qcow = &fmt->o_qcow; + ret = set_backing_file_options(context, param, + &o_qcow->backing_loc, NULL); + if (ret != 0) { + goto out; + } + tmp = o_qcow->encrypt ? "on" : "off"; + bd_ret = set_option_parameter(param, BLOCK_OPT_ENCRYPT, tmp); + assert(bd_ret == 0); + break; + case QB_FORMAT_QCOW2: + o_qcow2 = &fmt->o_qcow2; + ret = set_backing_file_options(context, param, + &o_qcow2->backing_loc, &o_qcow2->backing_fmt); + if (ret != 0) { + goto out; + } + tmp = o_qcow2->encrypt ? "on" : "off"; + bd_ret = set_option_parameter(param, BLOCK_OPT_ENCRYPT, tmp); + assert(bd_ret == 0); + bd_ret = set_option_parameter_int(param, + BLOCK_OPT_CLUSTER_SIZE, o_qcow2->cluster_size); + assert(bd_ret == 0); + + if (o_qcow2->cpt_lv != QB_FORMAT_QCOW2_COMPAT_DEFAULT) { + tmp = o_qcow2->cpt_lv == QB_FORMAT_QCOW2_COMPAT_V0_10 ? + "0.10" : "1.1"; + bd_ret = set_option_parameter(param, + BLOCK_OPT_COMPAT_LEVEL, tmp); + assert(bd_ret == 0); + } + + if (o_qcow2->pre_mode != QB_FORMAT_QCOW2_PREALLOC_DEFAULT) { + tmp = o_qcow2->pre_mode == QB_FORMAT_QCOW2_PREALLOC_OFF ? + "off" : "metadata"; + bd_ret = set_option_parameter(param, + BLOCK_OPT_PREALLOC, tmp); + assert(bd_ret == 0); + } + break; + + case QB_FORMAT_RAW: + /* do nothing now. */ + break; + case QB_FORMAT_RBD: + o_rbd = &fmt->o_rbd; + bd_ret = set_option_parameter_int(param, + BLOCK_OPT_CLUSTER_SIZE, o_rbd->cluster_size); + assert(bd_ret == 0); + break; + case QB_FORMAT_SHEEPDOG: + o_sd = &fmt->o_sd; + ret = set_backing_file_options(context, param, + &o_sd->backing_loc, NULL); + if (ret != 0) { + goto out; + } + if (o_sd->pre_mode != QB_FORMAT_SD_PREALLOC_DEFAULT) { + tmp = o_sd->pre_mode == QB_FORMAT_SD_PREALLOC_OFF ? "off" : "full"; + bd_ret = set_option_parameter(param, + BLOCK_OPT_PREALLOC, tmp); + assert(bd_ret == 0); + } + break; + case QB_FORMAT_VDI: + o_vdi = &fmt->o_vdi; + /* following option is not always valid depends on configuration */ + set_option_parameter_int(param, + BLOCK_OPT_CLUSTER_SIZE, o_vdi->cluster_size); + if (o_vdi->pre_mode != QB_FORMAT_VDI_PREALLOC_DEFAULT) { + tmp_bool = o_vdi->pre_mode == QB_FORMAT_VDI_PREALLOC_METADATA ? + true : false; + set_option_parameter_int(param, "static", tmp_bool); + } + break; + case QB_FORMAT_VMDK: + o_vmdk = &fmt->o_vmdk; + ret = set_backing_file_options(context, param, + &o_vmdk->backing_loc, NULL); + if (ret != 0) { + goto out; + } + + if (o_vmdk->cpt_lv != QB_FORMAT_VMDK_COMPAT_DEFAULT) { + tmp_bool = o_vmdk->cpt_lv == QB_FORMAT_VMDK_COMPAT_VMDKV6_TRUE ? + true : false; + bd_ret = set_option_parameter_int(param, BLOCK_OPT_COMPAT6, + tmp_bool); + assert(bd_ret == 0); + } + if (o_vmdk->subfmt != QB_FORMAT_VMDK_SUBFMT_DEFAULT) { + switch (o_vmdk->subfmt) { + case QB_FORMAT_VMDK_SUBFMT_MONOLITHIC_SPARSE: + tmp = "monolithicSparse"; + break; + case QB_FORMAT_VMDK_SUBFMT_MONOLITHIC_FLAT: + tmp = "monolithicFlat"; + break; + case QB_FORMAT_VMDK_SUBFMT_TWOGBMAX_EXTENT_SPARSE: + tmp = "twoGbMaxExtentSparse"; + break; + case QB_FORMAT_VMDK_SUBFMT_TWOGBMAX_EXTENT_FLAT: + tmp = "twoGbMaxExtentFlat"; + break; + case QB_FORMAT_VMDK_SUBFMT_STREAM_OPTIMIZED: + tmp = "streamOptimized"; + break; + default: + set_context_err(context, QB_ERR_INVALID_PARAM, + "invalid VMDK sumfmt type %d was set.", o_vmdk->subfmt); + ret = context->err_ret; + goto out; + break; + } + bd_ret = set_option_parameter(param, + BLOCK_OPT_SUBFMT, tmp); + assert(bd_ret == 0); + } + break; + case QB_FORMAT_VPC: + o_vpc = &fmt->o_vpc; + if (o_vpc->subfmt != QB_FORMAT_VPC_SUBFMT_DEFAULT) { + tmp = o_vpc->subfmt == QB_FORMAT_VPC_SUBFMT_DYNAMIC ? + "dynamic" : "fixed"; + bd_ret = set_option_parameter(param, + BLOCK_OPT_SUBFMT, tmp); + assert(bd_ret == 0); + } + break; + default: + set_context_err(context, QB_ERR_INVALID_PARAM, + "invalid format type %d was set.", fmt->fmt_type); + ret = context->err_ret; + goto out; + break; + } + + backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); + if (backing_file && backing_file->value.s) { + if (!strcmp(filename, backing_file->value.s)) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "Backing file is the same with new file."); + ret = context->err_ret; + goto out; + } + } + + backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); + if (backing_fmt && backing_fmt->value.s) { + backing_drv = bdrv_find_format(backing_fmt->value.s); + assert(backing_drv != NULL); + } + + size = get_option_parameter(param, BLOCK_OPT_SIZE); + if (size && size->value.n <= 0) { + if (backing_file && backing_file->value.s) { + uint64_t size; + char buf[32]; + int back_flags; + + /* backing files always opened read-only */ + back_flags = + flag & + ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); + + bs = bdrv_new(""); + + ret = bdrv_open(bs, backing_file->value.s, + back_flags, backing_drv); + if (ret < 0) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "Failed to open the backing file."); + ret = context->err_ret; + goto out; + } + bdrv_get_geometry(bs, &size); + size *= BDRV_SECTOR_SIZE; + + snprintf(buf, sizeof(buf), "%" PRId64, size); + set_option_parameter(param, BLOCK_OPT_SIZE, buf); + } else { + set_context_err(context, QB_ERR_INTERNAL_ERR, + "Neither size or backing file was not set."); + ret = context->err_ret; + goto out; + } + } + + bd_ret = bdrv_create(drv, filename, param); + + + if (bd_ret < 0) { + const char *errstr; + if (bd_ret == -ENOTSUP) { + errstr = "formatting option not supported."; + } else if (bd_ret == -EFBIG) { + errstr = "The image size is too large."; + } else { + errstr = "Error in creating the image."; + } + set_context_err(context, QB_ERR_INTERNAL_ERR, errstr); + ret = context->err_ret; + } + +out: + free_option_parameters(create_options); + free_option_parameters(param); + g_free(filename); + if (bs) { + bdrv_delete(bs); + } + + return ret; +} + +int qb_open(QBlockContext *context, + QBlockImage *qbi, + QBlockLocationInfo *loc, + QBlockFormatInfo *fmt, + int flag) +{ + int ret = 0, bd_ret; + BlockDriverState *bs; + BlockDriver *bd; + const char *fmtstr; + char *filename = NULL; + + /* take care of user settings */ + /* do nothing now */ + + /* check parameters */ + if (flag & (~LIBQBLOCK_O_VALID_MASK)) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "Invalid flag was set."); + ret = context->err_ret; + goto out; + } + + if ((loc == NULL) || (qbi == NULL)) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "Got unexpected NULL pointer in parameters."); + ret = context->err_ret; + goto out; + } + + ret = loc_check_params(context, loc); + if (ret != 0) { + goto out; + } + + /* internal translate */ + ret = loc2filename(context, loc, &filename); + if (ret != 0) { + goto out; + } + + fmtstr = NULL; + bd = NULL; + if (fmt != NULL) { + fmtstr = qb_formattype2str(fmt->fmt_type); + } + + if (fmtstr != NULL) { + bd = bdrv_find_format(fmtstr); + assert(bd != NULL); + } + + /* do real opening */ + bs = qbi->bdrvs; + bd_ret = bdrv_open(bs, filename, flag, bd); + if (bd_ret < 0) { + set_context_err(context, QB_ERR_INTERNAL_ERR, + "Failed in opening with driver, bd_ret is %d.", bd_ret); + ret = context->err_ret; + goto out; + } + + if (qbi->filename != NULL) { + g_free(qbi->filename); + } + qbi->filename = g_strdup(filename); + + out: + g_free(filename); + return ret; +} + +void qb_close(QBlockContext *context, + QBlockImage *qbi) +{ + BlockDriverState *bs; + + bs = qbi->bdrvs; + + if (qbi->filename != NULL) { + QB_FREE(qbi->filename); + bdrv_close(bs); + } + return; +} + +int32_t qb_read(QBlockContext *context, + QBlockImage *qbi, + uint8_t *buf, + uint32_t len, + uint64_t offset) +{ + int bd_ret; + BlockDriverState *bs; + + context->err_ret = 0; + bs = qbi->bdrvs; + + if (len <= 0) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "Param len is less or equal to zero."); + return context->err_ret; + } + + bd_ret = bdrv_pread(bs, offset, buf, len); + if (bd_ret < 0) { + set_context_err(context, QB_ERR_INTERNAL_ERR, + "I/O errors."); + context->err_no = bd_ret; + return context->err_ret; + } + + return bd_ret; +} + +int32_t qb_write(QBlockContext *context, + QBlockImage *qbi, + const uint8_t *buf, + uint32_t len, + uint64_t offset) +{ + int bd_ret; + BlockDriverState *bs; + + context->err_ret = 0; + bs = qbi->bdrvs; + + if (len <= 0) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "Param len is less or equal to zero."); + return context->err_ret; + } + + bd_ret = bdrv_pwrite(bs, offset, buf, len); + if (bd_ret < 0) { + set_context_err(context, QB_ERR_INTERNAL_ERR, + "I/O errors."); + context->err_no = bd_ret; + return context->err_ret; + } + + return bd_ret; +} + +int qb_flush(QBlockContext *context, + QBlockImage *qbi) +{ + int bd_ret; + BlockDriverState *bs; + + context->err_ret = 0; + bs = qbi->bdrvs; + bd_ret = bdrv_flush(bs); + if (bd_ret < 0) { + set_context_err(context, QB_ERR_INTERNAL_ERR, + "Internal error."); + } + return context->err_ret; +} + +int qb_check_allocation(QBlockContext *context, + QBlockImage *qbi, + uint64_t start, + int64_t length, + int *pstatus, + int64_t *plength) +{ + int ret; + int sector_start, sector_num, num; + BlockDriverState *bs; + unsigned int real_len, ret_len; + + context->err_ret = 0; + bs = qbi->bdrvs; + + /* Now bdrv_is_allocated take nb_sectors as int with unit sector, but this + API take length as int64_t with unit bytes, so a check is needed to ensure + no silent error will happen in translating bytes to sector later if length + is too big. + max_sectors is set to INT_MAX - 1 in case of that real_len is bigger + than length. + Gcc issue? a = (0x7ffffffe << 9) was compiled to 0xfffffffffffffc00, it + should be 0xfffffffc00, so use variable instead of direct macro + calculation. */ + if (sizeof(int) < (sizeof(int64_t) - BDRV_SECTOR_BITS/8)) { + int64_t max_sectors = INT_MAX - 1; + int64_t max_bytes = max_sectors << BDRV_SECTOR_BITS; + + if (length > max_bytes) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "Length is too big."); + goto out; + } + } + + if (length <= 0) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "Length is not valid."); + goto out; + } + + if (qbi->filename == NULL) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "Image was not opened first."); + goto out; + } + + /* translate to sector */ + sector_start = start >> BDRV_SECTOR_BITS; + real_len = (start & (~BDRV_SECTOR_MASK)) + length; + sector_num = real_len >> BDRV_SECTOR_BITS; + if ((real_len & (~BDRV_SECTOR_MASK)) != 0) { + sector_num++; + } + + ret = bdrv_is_allocated(bs, sector_start, sector_num, &num); + if ((ret == 0) && (num == 0)) { + set_context_err(context, QB_ERR_BLOCK_OUT_OF_RANGE, + "Start position was bigger than the image's size."); + goto out; + } + + *pstatus = ret; + ret_len = (num << BDRV_SECTOR_BITS) - (start & (~BDRV_SECTOR_MASK)); + if (ret_len > length) { + ret_len = length; + } + *plength = ret_len; + + out: + return context->err_ret; +} + +static void qb_setup_info_addr(const QBlockStaticInfo *info, + QBlockStaticInfoAddr *info_addr) +{ + const QBlockLocationInfo *backing_loc = NULL; + const bool *encrypt = NULL; + const QBlockFormatInfo *fmt = &info->fmt; + + memset(info_addr, 0, sizeof(QBlockStaticInfoAddr)); + + switch (fmt->fmt_type) { + case QB_FORMAT_COW: + backing_loc = &fmt->o_cow.backing_loc; + break; + case QB_FORMAT_QED: + backing_loc = &fmt->o_qed.backing_loc; + break; + case QB_FORMAT_QCOW: + backing_loc = &fmt->o_qcow.backing_loc; + encrypt = &fmt->o_qcow.encrypt; + break; + case QB_FORMAT_QCOW2: + backing_loc = &fmt->o_qcow2.backing_loc; + encrypt = &fmt->o_qcow2.encrypt; + break; + case QB_FORMAT_RAW: + break; + case QB_FORMAT_RBD: + break; + case QB_FORMAT_SHEEPDOG: + backing_loc = &fmt->o_sd.backing_loc; + break; + case QB_FORMAT_VDI: + break; + case QB_FORMAT_VMDK: + backing_loc = &fmt->o_vmdk.backing_loc; + break; + case QB_FORMAT_VPC: + break; + default: + break; + } + + info_addr->backing_loc = (QBlockLocationInfo *)backing_loc; + info_addr->encrypt = (bool *)encrypt; + return; +} + +const uint64_t *qb_get_virt_size(const QBlockStaticInfo *info) +{ + return &info->fmt.virt_size; +} + +const QBlockLocationInfo *qb_get_backing_loc(const QBlockStaticInfo *info) +{ + QBlockStaticInfoAddr addr; + qb_setup_info_addr(info, &addr); + return addr.backing_loc; +} + +const bool *qb_get_encrypt(const QBlockStaticInfo *info) +{ + QBlockStaticInfoAddr addr; + qb_setup_info_addr(info, &addr); + return addr.encrypt; +} + +int qb_info_image_static_get(QBlockContext *context, + QBlockImage *qbi, + QBlockStaticInfo **p_info) +{ + int ret = 0; + BlockDriverState *bs; + QBlockStaticInfo *info; + QBlockStaticInfoAddr addr; + const char *fmt_str; + uint64_t total_sectors; + char backing_filename[LIBQB_FILENAME_MAX]; + + if (qbi->filename == NULL) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "Block Image was not opened."); + ret = context->err_ret; + goto out; + } + + info = g_malloc0_n(1, sizeof(QBlockStaticInfo)); + + bs = qbi->bdrvs; + + ret = filename2loc(context, + &info->loc, + qbi->filename); + if (ret < 0) { + goto free; + } + + fmt_str = bdrv_get_format_name(bs); + info->fmt.fmt_type = qb_str2fmttype(fmt_str); + if (info->fmt.fmt_type == QB_FORMAT_NONE) { + set_context_err(context, QB_ERR_INVALID_PARAM, + "Image format %s not valid.", fmt_str); + ret = context->err_ret; + goto free; + } + + /* we got the format type and basic location info now, setup the struct + pointer to the internal members */ + qb_setup_info_addr(info, &addr); + + bdrv_get_geometry(bs, &total_sectors); + info->fmt.virt_size = total_sectors * BDRV_SECTOR_SIZE; + + if (addr.encrypt != NULL) { + *(addr.encrypt) = bdrv_is_encrypted(bs); + } + + bdrv_get_full_backing_filename(bs, backing_filename, + sizeof(backing_filename)); + if (backing_filename[0] != '\0') { + assert(addr.backing_loc != NULL); + ret = filename2loc(context, + addr.backing_loc, + backing_filename); + if (ret < 0) { + goto free; + } + } + + info->sector_size = BDRV_SECTOR_SIZE; + *p_info = info; + + out: + return ret; + free: + qb_info_image_static_delete(context, &info); + return ret; +} + +/* free locations if it has string allocated on heap. */ +static void loc_free(QBlockLocationInfo *loc) +{ + switch (loc->prot_type) { + case QB_PROTO_FILE: + g_free((void *)(loc->o_file.filename)); + loc->o_file.filename = NULL; + break; + default: + break; + } +} + +/* free fmt related resoure. */ +static void fmt_free(QBlockFormatInfo *fmt) +{ + switch (fmt->fmt_type) { + case QB_FORMAT_COW: + loc_free(&fmt->o_cow.backing_loc); + break; + case QB_FORMAT_QED: + loc_free(&fmt->o_qed.backing_loc); + break; + case QB_FORMAT_QCOW: + loc_free(&fmt->o_qcow.backing_loc); + break; + case QB_FORMAT_QCOW2: + loc_free(&fmt->o_qcow2.backing_loc); + break; + case QB_FORMAT_RAW: + break; + case QB_FORMAT_RBD: + break; + case QB_FORMAT_SHEEPDOG: + loc_free(&fmt->o_sd.backing_loc); + break; + case QB_FORMAT_VDI: + break; + case QB_FORMAT_VMDK: + loc_free(&fmt->o_vmdk.backing_loc); + break; + case QB_FORMAT_VPC: + break; + default: + break; + } + return; +} + +void qb_info_image_static_delete(QBlockContext *context, + QBlockStaticInfo **p_info) +{ + loc_free(&(*p_info)->loc); + fmt_free(&(*p_info)->fmt); + QB_FREE(*p_info); +} + +QBlockLocationInfo *qb_location_info_dup(const QBlockLocationInfo *prot) +{ + QBlockLocationInfo *p = g_malloc0_n(1, sizeof(QBlockLocationInfo)); + p->prot_type = prot->prot_type; + switch (p->prot_type) { + case QB_PROTO_FILE: + p->o_file.filename = + g_strdup(prot->o_file.filename); + break; + default: + break; + } + return p; +}