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Re: [Qemu-devel] [PATCH V18 08/10] libqblock: libqblock API implement
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From: |
Blue Swirl |
|
Subject: |
Re: [Qemu-devel] [PATCH V18 08/10] libqblock: libqblock API implement |
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Date: |
Sat, 9 Feb 2013 13:15:48 +0000 |
On Sat, Feb 9, 2013 at 7:42 AM, Wenchao Xia <address@hidden> wrote:
> This patch contains implemention for APIs. Basically it is a layer
> above qemu block general layer now.
> qb_image_new() will try do init for this library.
>
> Signed-off-by: Wenchao Xia <address@hidden>
> ---
> libqblock/libqblock-error.c | 49 +++
> libqblock/libqblock.c | 991
> +++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 1040 insertions(+), 0 deletions(-)
>
> diff --git a/libqblock/libqblock-error.c b/libqblock/libqblock-error.c
> index e69de29..2367ab4 100644
> --- a/libqblock/libqblock-error.c
> +++ b/libqblock/libqblock-error.c
> @@ -0,0 +1,49 @@
> +/*
> + * QEMU block layer library
> + *
> + * Copyright IBM, Corp. 2013
> + *
> + * Authors:
> + * Wenchao Xia <address@hidden>
> + *
> + * 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"
> +
> +char *qb_error_get_human_str(QBlockImage *image)
> +{
> + char *ret = NULL;
> + QBlockContext *ctx = image->ctx;
> + const char *str;
> + switch (ctx->err_ret) {
> + case QB_ERR_INTERNAL_ERR:
> + str = "Internal error.";
> + break;
> + case QB_ERR_FATAL_ERR:
> + str = "Fatal error.";
> + break;
> + case QB_ERR_INVALID_PARAM:
> + str = "Invalid param.";
> + break;
> + case QB_ERR_BLOCK_OUT_OF_RANGE:
> + str = "request is out of image's range.";
> + break;
> + default:
> + str = "Unknown error.";
> + break;
> + }
> +
> + if (ctx->err_ret == QB_ERR_INTERNAL_ERR) {
> + ret = g_strdup_printf("%s %s errno [%d]. strerror [%s].",
> + str, ctx->g_error->message,
> + ctx->err_no, strerror(-ctx->err_no));
> + } else {
> + ret = g_strdup_printf("%s %s",
> + str, ctx->g_error->message);
> + }
> + return ret;
> +}
> diff --git a/libqblock/libqblock.c b/libqblock/libqblock.c
> index e69de29..d7b6ee5 100644
> --- a/libqblock/libqblock.c
> +++ b/libqblock/libqblock.c
> @@ -0,0 +1,991 @@
> +/*
> + * QEMU block layer library
> + *
> + * Copyright IBM, Corp. 2013
> + *
> + * Authors:
> + * Wenchao Xia <address@hidden>
> + *
> + * 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 <unistd.h>
> +#include <stdarg.h>
> +#include <pthread.h>
> +
> +#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[] = {
static const
> + {"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},
You can avoid this NULL entry and save space by using ARRAY_SIZE() in
the loop. Compiler could also unroll the loop.
> +};
> +
> +__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;
This does not seem to be useful, you could use libqb_formatstr_table directly.
> +
> + if ((fmt_type <= QB_FORMAT_NONE) || (fmt_type >= QB_FORMAT_MAX)) {
> + return NULL;
> + }
> + while (tb[i].fmt_str != NULL) {
for (i = 0; i < ARRAY_SIZE(libqb_formatstr_table); i++) {
> + 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, ...)
GCC_FMT_ATTR()?
> +{
> + 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(qb_error_quark(), 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;
> + }
> +}
> +
> +static int create_context(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;
> +}
> +
> +static void delete_context(QBlockContext **p_context)
> +{
> + if ((*p_context)->g_error != NULL) {
> + g_error_free((*p_context)->g_error);
> + }
> + g_free(*p_context);
> + *p_context = NULL;
> + return;
Useless return, please remove.
> +}
> +
> +int qb_image_new(QBlockImage **p_qbi)
> +{
> + int ret;
> + *p_qbi = g_malloc0_n(1, sizeof(QBlockImage));
> + ret = create_context(&(*p_qbi)->ctx);
> + if (ret < 0) {
> + return ret;
> + }
> +
> + (*p_qbi)->bdrvs = bdrv_new("hda");
> + if ((*p_qbi)->bdrvs == NULL) {
> + set_context_err((*p_qbi)->ctx, QB_ERR_INTERNAL_ERR,
> + "failed to create the driver.");
> + return QB_ERR_INTERNAL_ERR;
> + }
> + (*p_qbi)->ref_count = 1;
> + return 0;
> +}
> +
> +void qb_image_ref(QBlockImage *qbi)
> +{
> + qbi->ref_count++;
> +}
> +
> +void qb_image_unref(QBlockImage **p_qbi)
> +{
> + (*p_qbi)->ref_count--;
> + if ((*p_qbi)->ref_count > 0) {
> + return;
> + }
> + delete_context(&(*p_qbi)->ctx);
> + if ((*p_qbi)->filename != NULL) {
> + qb_close(*p_qbi);
> + }
> + if ((*p_qbi)->bdrvs != NULL) {
> + bdrv_delete((*p_qbi)->bdrvs);
> + (*p_qbi)->bdrvs = NULL;
> + }
> + g_free(*p_qbi);
> + *p_qbi = NULL;
> + return;
Ditto.
> +}
> +
> +/* 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) {
> + g_free(*p_filename);
> + *p_filename = NULL;
> + }
> + 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 can < 0 if loc have not been set, mean user did not specify
> backing
> + file, so no need to check return value */
> + loc2filename(context, loc, &backing_filename);
> +
> + 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(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;
> + QBlockContext *context = qbi->ctx;
> +
> + 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(QBlockImage *qbi,
> + QBlockLocationInfo *loc,
> + QBlockFormatInfo *fmt,
> + int flag)
> +{
> + int ret = 0, bd_ret;
> + BlockDriverState *bs;
> + BlockDriver *bd;
> + const char *fmtstr;
> + char *filename = NULL;
> + QBlockContext *context = qbi->ctx;
> +
> + /* 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(QBlockImage *qbi)
> +{
> + BlockDriverState *bs;
> +
> + bs = qbi->bdrvs;
> +
> + if (qbi->filename != NULL) {
> + g_free(qbi->filename);
> + qbi->filename = NULL;
> + bdrv_close(bs);
> + }
> + return;
> +}
> +
> +int32_t qb_read(QBlockImage *qbi,
> + uint8_t *buf,
> + uint32_t len,
> + uint64_t offset)
> +{
> + int bd_ret;
> + BlockDriverState *bs;
> + QBlockContext *context = qbi->ctx;
> +
> + 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 0;
> +}
> +
> +int32_t qb_write(QBlockImage *qbi,
> + const uint8_t *buf,
> + uint32_t len,
> + uint64_t offset)
> +{
> + int bd_ret;
> + BlockDriverState *bs;
> + QBlockContext *context = qbi->ctx;
> +
> + 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 0;
> +}
> +
> +int qb_flush(QBlockImage *qbi)
> +{
> + int bd_ret;
> + BlockDriverState *bs;
> + QBlockContext *context = qbi->ctx;
> +
> + 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(QBlockImage *qbi,
> + uint64_t start,
> + uint64_t length,
> + int *pstatus,
> + uint64_t *plength)
> +{
> + int ret;
> + int sector_start, sector_num, num;
> + BlockDriverState *bs;
> + unsigned int real_len, ret_len;
> + QBlockContext *context = qbi->ctx;
> +
> + 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)) {
> + uint64_t max_sectors = INT_MAX - 1;
> + uint64_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(QBlockImage *qbi,
> + QBlockStaticInfo *info)
> +{
> + int ret = 0;
> + BlockDriverState *bs;
> + QBlockStaticInfoAddr addr;
> + const char *fmt_str;
> + uint64_t total_sectors;
> + char backing_filename[LIBQB_FILENAME_MAX];
> + QBlockContext *context = qbi->ctx;
> +
> + if (qbi->filename == NULL) {
> + set_context_err(context, QB_ERR_INVALID_PARAM,
> + "Block Image was not opened.");
> + ret = context->err_ret;
> + goto out;
> + }
> +
> + bs = qbi->bdrvs;
> +
> + ret = filename2loc(context,
> + &info->loc,
> + qbi->filename);
> + if (ret < 0) {
> + goto out;
> + }
> +
> + 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 out;
> + }
> +
> + /* 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 out;
> + }
> + }
> +
> + info->sector_size = BDRV_SECTOR_SIZE;
> +
> + out:
> + return ret;
> +}
> --
> 1.7.1
>
>
>
- [Qemu-devel] [PATCH V18 00/10] libqblock qemu block layer library, Wenchao Xia, 2013/02/09
- [Qemu-devel] [PATCH V18 03/10] libqblock: build: add configure support, Wenchao Xia, 2013/02/09
- [Qemu-devel] [PATCH V18 04/10] libqblock: build: add rule for libqblock.la, Wenchao Xia, 2013/02/09
- [Qemu-devel] [PATCH V18 01/10] build: add command check-clean, Wenchao Xia, 2013/02/09
- [Qemu-devel] [PATCH V18 02/10] build: hide symbols in *.lo, Wenchao Xia, 2013/02/09
- [Qemu-devel] [PATCH V18 05/10] libqblock: build: add packaging support, Wenchao Xia, 2013/02/09
- [Qemu-devel] [PATCH V18 06/10] block: export function path_has_protocol(), Wenchao Xia, 2013/02/09
- [Qemu-devel] [PATCH V18 07/10] libqblock: libqblock API design and type defines, Wenchao Xia, 2013/02/09
- [Qemu-devel] [PATCH V18 08/10] libqblock: libqblock API implement, Wenchao Xia, 2013/02/09
- Re: [Qemu-devel] [PATCH V18 08/10] libqblock: libqblock API implement,
Blue Swirl <=
- [Qemu-devel] [PATCH V18 09/10] libqblock: build: add rules for test case, Wenchao Xia, 2013/02/09
- [Qemu-devel] [PATCH V18 10/10] libqblock: test: libqblock test example, Wenchao Xia, 2013/02/09