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1684 lines
51 KiB
C
1684 lines
51 KiB
C
/*
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* GlusterFS backend for QEMU
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*
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* Copyright (C) 2012 Bharata B Rao <bharata@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qemu/units.h"
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#include <glusterfs/api/glfs.h>
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#include "block/block_int.h"
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#include "block/qdict.h"
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#include "qapi/error.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qmp/qerror.h"
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#include "qemu/uri.h"
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#include "qemu/error-report.h"
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#include "qemu/module.h"
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#include "qemu/option.h"
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#include "qemu/cutils.h"
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#ifdef CONFIG_GLUSTERFS_FTRUNCATE_HAS_STAT
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# define glfs_ftruncate(fd, offset) glfs_ftruncate(fd, offset, NULL, NULL)
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#endif
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#define GLUSTER_OPT_FILENAME "filename"
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#define GLUSTER_OPT_VOLUME "volume"
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#define GLUSTER_OPT_PATH "path"
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#define GLUSTER_OPT_TYPE "type"
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#define GLUSTER_OPT_SERVER_PATTERN "server."
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#define GLUSTER_OPT_HOST "host"
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#define GLUSTER_OPT_PORT "port"
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#define GLUSTER_OPT_TO "to"
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#define GLUSTER_OPT_IPV4 "ipv4"
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#define GLUSTER_OPT_IPV6 "ipv6"
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#define GLUSTER_OPT_SOCKET "socket"
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#define GLUSTER_OPT_DEBUG "debug"
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#define GLUSTER_DEFAULT_PORT 24007
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#define GLUSTER_DEBUG_DEFAULT 4
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#define GLUSTER_DEBUG_MAX 9
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#define GLUSTER_OPT_LOGFILE "logfile"
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#define GLUSTER_LOGFILE_DEFAULT "-" /* handled in libgfapi as /dev/stderr */
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/*
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* Several versions of GlusterFS (3.12? -> 6.0.1) fail when the transfer size
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* is greater or equal to 1024 MiB, so we are limiting the transfer size to 512
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* MiB to avoid this rare issue.
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*/
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#define GLUSTER_MAX_TRANSFER (512 * MiB)
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#define GERR_INDEX_HINT "hint: check in 'server' array index '%d'\n"
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typedef struct GlusterAIOCB {
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int64_t size;
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int ret;
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Coroutine *coroutine;
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AioContext *aio_context;
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} GlusterAIOCB;
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typedef struct BDRVGlusterState {
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struct glfs *glfs;
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struct glfs_fd *fd;
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char *logfile;
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bool supports_seek_data;
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int debug;
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} BDRVGlusterState;
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typedef struct BDRVGlusterReopenState {
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struct glfs *glfs;
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struct glfs_fd *fd;
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} BDRVGlusterReopenState;
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typedef struct GlfsPreopened {
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char *volume;
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glfs_t *fs;
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int ref;
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} GlfsPreopened;
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typedef struct ListElement {
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QLIST_ENTRY(ListElement) list;
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GlfsPreopened saved;
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} ListElement;
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static QLIST_HEAD(, ListElement) glfs_list;
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static QemuOptsList qemu_gluster_create_opts = {
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.name = "qemu-gluster-create-opts",
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.head = QTAILQ_HEAD_INITIALIZER(qemu_gluster_create_opts.head),
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.desc = {
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{
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.name = BLOCK_OPT_SIZE,
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.type = QEMU_OPT_SIZE,
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.help = "Virtual disk size"
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},
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{
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.name = BLOCK_OPT_PREALLOC,
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.type = QEMU_OPT_STRING,
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.help = "Preallocation mode (allowed values: off"
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#ifdef CONFIG_GLUSTERFS_FALLOCATE
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", falloc"
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#endif
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#ifdef CONFIG_GLUSTERFS_ZEROFILL
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", full"
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#endif
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")"
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},
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{
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.name = GLUSTER_OPT_DEBUG,
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.type = QEMU_OPT_NUMBER,
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.help = "Gluster log level, valid range is 0-9",
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},
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{
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.name = GLUSTER_OPT_LOGFILE,
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.type = QEMU_OPT_STRING,
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.help = "Logfile path of libgfapi",
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},
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{ /* end of list */ }
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}
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};
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static QemuOptsList runtime_opts = {
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.name = "gluster",
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.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
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.desc = {
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{
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.name = GLUSTER_OPT_FILENAME,
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.type = QEMU_OPT_STRING,
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.help = "URL to the gluster image",
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},
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{
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.name = GLUSTER_OPT_DEBUG,
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.type = QEMU_OPT_NUMBER,
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.help = "Gluster log level, valid range is 0-9",
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},
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{
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.name = GLUSTER_OPT_LOGFILE,
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.type = QEMU_OPT_STRING,
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.help = "Logfile path of libgfapi",
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},
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{ /* end of list */ }
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},
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};
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static QemuOptsList runtime_json_opts = {
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.name = "gluster_json",
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.head = QTAILQ_HEAD_INITIALIZER(runtime_json_opts.head),
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.desc = {
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{
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.name = GLUSTER_OPT_VOLUME,
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.type = QEMU_OPT_STRING,
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.help = "name of gluster volume where VM image resides",
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},
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{
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.name = GLUSTER_OPT_PATH,
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.type = QEMU_OPT_STRING,
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.help = "absolute path to image file in gluster volume",
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},
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{
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.name = GLUSTER_OPT_DEBUG,
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.type = QEMU_OPT_NUMBER,
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.help = "Gluster log level, valid range is 0-9",
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},
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{ /* end of list */ }
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},
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};
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static QemuOptsList runtime_type_opts = {
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.name = "gluster_type",
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.head = QTAILQ_HEAD_INITIALIZER(runtime_type_opts.head),
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.desc = {
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{
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.name = GLUSTER_OPT_TYPE,
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.type = QEMU_OPT_STRING,
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.help = "inet|unix",
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},
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{ /* end of list */ }
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},
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};
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static QemuOptsList runtime_unix_opts = {
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.name = "gluster_unix",
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.head = QTAILQ_HEAD_INITIALIZER(runtime_unix_opts.head),
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.desc = {
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{
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.name = GLUSTER_OPT_SOCKET,
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.type = QEMU_OPT_STRING,
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.help = "socket file path (legacy)",
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},
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{
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.name = GLUSTER_OPT_PATH,
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.type = QEMU_OPT_STRING,
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.help = "socket file path (QAPI)",
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},
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{ /* end of list */ }
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},
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};
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static QemuOptsList runtime_inet_opts = {
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.name = "gluster_inet",
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.head = QTAILQ_HEAD_INITIALIZER(runtime_inet_opts.head),
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.desc = {
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{
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.name = GLUSTER_OPT_TYPE,
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.type = QEMU_OPT_STRING,
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.help = "inet|unix",
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},
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{
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.name = GLUSTER_OPT_HOST,
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.type = QEMU_OPT_STRING,
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.help = "host address (hostname/ipv4/ipv6 addresses)",
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},
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{
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.name = GLUSTER_OPT_PORT,
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.type = QEMU_OPT_STRING,
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.help = "port number on which glusterd is listening (default 24007)",
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},
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{
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.name = "to",
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.type = QEMU_OPT_NUMBER,
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.help = "max port number, not supported by gluster",
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},
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{
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.name = "ipv4",
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.type = QEMU_OPT_BOOL,
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.help = "ipv4 bool value, not supported by gluster",
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},
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{
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.name = "ipv6",
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.type = QEMU_OPT_BOOL,
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.help = "ipv6 bool value, not supported by gluster",
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},
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{ /* end of list */ }
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},
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};
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static void glfs_set_preopened(const char *volume, glfs_t *fs)
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{
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ListElement *entry = NULL;
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entry = g_new(ListElement, 1);
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entry->saved.volume = g_strdup(volume);
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entry->saved.fs = fs;
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entry->saved.ref = 1;
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QLIST_INSERT_HEAD(&glfs_list, entry, list);
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}
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static glfs_t *glfs_find_preopened(const char *volume)
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{
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ListElement *entry = NULL;
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QLIST_FOREACH(entry, &glfs_list, list) {
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if (strcmp(entry->saved.volume, volume) == 0) {
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entry->saved.ref++;
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return entry->saved.fs;
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}
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}
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return NULL;
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}
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static void glfs_clear_preopened(glfs_t *fs)
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{
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ListElement *entry = NULL;
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ListElement *next;
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if (fs == NULL) {
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return;
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}
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QLIST_FOREACH_SAFE(entry, &glfs_list, list, next) {
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if (entry->saved.fs == fs) {
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if (--entry->saved.ref) {
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return;
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}
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QLIST_REMOVE(entry, list);
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glfs_fini(entry->saved.fs);
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g_free(entry->saved.volume);
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g_free(entry);
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}
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}
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}
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static int parse_volume_options(BlockdevOptionsGluster *gconf, char *path)
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{
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char *p, *q;
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if (!path) {
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return -EINVAL;
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}
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/* volume */
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p = q = path + strspn(path, "/");
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p += strcspn(p, "/");
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if (*p == '\0') {
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return -EINVAL;
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}
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gconf->volume = g_strndup(q, p - q);
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/* path */
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p += strspn(p, "/");
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if (*p == '\0') {
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return -EINVAL;
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}
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gconf->path = g_strdup(p);
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return 0;
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}
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/*
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* file=gluster[+transport]://[host[:port]]/volume/path[?socket=...]
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*
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* 'gluster' is the protocol.
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*
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* 'transport' specifies the transport type used to connect to gluster
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* management daemon (glusterd). Valid transport types are
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* tcp or unix. If a transport type isn't specified, then tcp type is assumed.
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*
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* 'host' specifies the host where the volume file specification for
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* the given volume resides. This can be either hostname or ipv4 address.
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* If transport type is 'unix', then 'host' field should not be specified.
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* The 'socket' field needs to be populated with the path to unix domain
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* socket.
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*
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* 'port' is the port number on which glusterd is listening. This is optional
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* and if not specified, QEMU will send 0 which will make gluster to use the
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* default port. If the transport type is unix, then 'port' should not be
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* specified.
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*
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* 'volume' is the name of the gluster volume which contains the VM image.
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*
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* 'path' is the path to the actual VM image that resides on gluster volume.
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*
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* Examples:
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*
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* file=gluster://1.2.3.4/testvol/a.img
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* file=gluster+tcp://1.2.3.4/testvol/a.img
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* file=gluster+tcp://1.2.3.4:24007/testvol/dir/a.img
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* file=gluster+tcp://host.domain.com:24007/testvol/dir/a.img
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* file=gluster+unix:///testvol/dir/a.img?socket=/tmp/glusterd.socket
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*/
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static int qemu_gluster_parse_uri(BlockdevOptionsGluster *gconf,
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const char *filename)
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{
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SocketAddress *gsconf;
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URI *uri;
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QueryParams *qp = NULL;
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bool is_unix = false;
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int ret = 0;
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uri = uri_parse(filename);
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if (!uri) {
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return -EINVAL;
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}
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gsconf = g_new0(SocketAddress, 1);
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QAPI_LIST_PREPEND(gconf->server, gsconf);
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/* transport */
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if (!uri->scheme || !strcmp(uri->scheme, "gluster")) {
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gsconf->type = SOCKET_ADDRESS_TYPE_INET;
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} else if (!strcmp(uri->scheme, "gluster+tcp")) {
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gsconf->type = SOCKET_ADDRESS_TYPE_INET;
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} else if (!strcmp(uri->scheme, "gluster+unix")) {
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gsconf->type = SOCKET_ADDRESS_TYPE_UNIX;
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is_unix = true;
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} else if (!strcmp(uri->scheme, "gluster+rdma")) {
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gsconf->type = SOCKET_ADDRESS_TYPE_INET;
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warn_report("rdma feature is not supported, falling back to tcp");
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} else {
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ret = -EINVAL;
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goto out;
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}
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|
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ret = parse_volume_options(gconf, uri->path);
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if (ret < 0) {
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goto out;
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}
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|
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qp = query_params_parse(uri->query);
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if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) {
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ret = -EINVAL;
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goto out;
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}
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if (is_unix) {
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if (uri->server || uri->port) {
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ret = -EINVAL;
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goto out;
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|
}
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if (strcmp(qp->p[0].name, "socket")) {
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ret = -EINVAL;
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goto out;
|
|
}
|
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gsconf->u.q_unix.path = g_strdup(qp->p[0].value);
|
|
} else {
|
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gsconf->u.inet.host = g_strdup(uri->server ? uri->server : "localhost");
|
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if (uri->port) {
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gsconf->u.inet.port = g_strdup_printf("%d", uri->port);
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} else {
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gsconf->u.inet.port = g_strdup_printf("%d", GLUSTER_DEFAULT_PORT);
|
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}
|
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}
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|
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out:
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if (qp) {
|
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query_params_free(qp);
|
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}
|
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uri_free(uri);
|
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return ret;
|
|
}
|
|
|
|
static struct glfs *qemu_gluster_glfs_init(BlockdevOptionsGluster *gconf,
|
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Error **errp)
|
|
{
|
|
struct glfs *glfs;
|
|
int ret;
|
|
int old_errno;
|
|
SocketAddressList *server;
|
|
unsigned long long port;
|
|
|
|
glfs = glfs_find_preopened(gconf->volume);
|
|
if (glfs) {
|
|
return glfs;
|
|
}
|
|
|
|
glfs = glfs_new(gconf->volume);
|
|
if (!glfs) {
|
|
goto out;
|
|
}
|
|
|
|
glfs_set_preopened(gconf->volume, glfs);
|
|
|
|
for (server = gconf->server; server; server = server->next) {
|
|
switch (server->value->type) {
|
|
case SOCKET_ADDRESS_TYPE_UNIX:
|
|
ret = glfs_set_volfile_server(glfs, "unix",
|
|
server->value->u.q_unix.path, 0);
|
|
break;
|
|
case SOCKET_ADDRESS_TYPE_INET:
|
|
if (parse_uint_full(server->value->u.inet.port, &port, 10) < 0 ||
|
|
port > 65535) {
|
|
error_setg(errp, "'%s' is not a valid port number",
|
|
server->value->u.inet.port);
|
|
errno = EINVAL;
|
|
goto out;
|
|
}
|
|
ret = glfs_set_volfile_server(glfs, "tcp",
|
|
server->value->u.inet.host,
|
|
(int)port);
|
|
break;
|
|
case SOCKET_ADDRESS_TYPE_VSOCK:
|
|
case SOCKET_ADDRESS_TYPE_FD:
|
|
default:
|
|
abort();
|
|
}
|
|
|
|
if (ret < 0) {
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = glfs_set_logging(glfs, gconf->logfile, gconf->debug);
|
|
if (ret < 0) {
|
|
goto out;
|
|
}
|
|
|
|
ret = glfs_init(glfs);
|
|
if (ret) {
|
|
error_setg(errp, "Gluster connection for volume %s, path %s failed"
|
|
" to connect", gconf->volume, gconf->path);
|
|
for (server = gconf->server; server; server = server->next) {
|
|
if (server->value->type == SOCKET_ADDRESS_TYPE_UNIX) {
|
|
error_append_hint(errp, "hint: failed on socket %s ",
|
|
server->value->u.q_unix.path);
|
|
} else {
|
|
error_append_hint(errp, "hint: failed on host %s and port %s ",
|
|
server->value->u.inet.host,
|
|
server->value->u.inet.port);
|
|
}
|
|
}
|
|
|
|
error_append_hint(errp, "Please refer to gluster logs for more info\n");
|
|
|
|
/* glfs_init sometimes doesn't set errno although docs suggest that */
|
|
if (errno == 0) {
|
|
errno = EINVAL;
|
|
}
|
|
|
|
goto out;
|
|
}
|
|
return glfs;
|
|
|
|
out:
|
|
if (glfs) {
|
|
old_errno = errno;
|
|
glfs_clear_preopened(glfs);
|
|
errno = old_errno;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Convert the json formatted command line into qapi.
|
|
*/
|
|
static int qemu_gluster_parse_json(BlockdevOptionsGluster *gconf,
|
|
QDict *options, Error **errp)
|
|
{
|
|
QemuOpts *opts;
|
|
SocketAddress *gsconf = NULL;
|
|
SocketAddressList **tail;
|
|
QDict *backing_options = NULL;
|
|
Error *local_err = NULL;
|
|
char *str = NULL;
|
|
const char *ptr;
|
|
int i, type, num_servers;
|
|
|
|
/* create opts info from runtime_json_opts list */
|
|
opts = qemu_opts_create(&runtime_json_opts, NULL, 0, &error_abort);
|
|
if (!qemu_opts_absorb_qdict(opts, options, errp)) {
|
|
goto out;
|
|
}
|
|
|
|
num_servers = qdict_array_entries(options, GLUSTER_OPT_SERVER_PATTERN);
|
|
if (num_servers < 1) {
|
|
error_setg(&local_err, QERR_MISSING_PARAMETER, "server");
|
|
goto out;
|
|
}
|
|
|
|
ptr = qemu_opt_get(opts, GLUSTER_OPT_VOLUME);
|
|
if (!ptr) {
|
|
error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_VOLUME);
|
|
goto out;
|
|
}
|
|
gconf->volume = g_strdup(ptr);
|
|
|
|
ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH);
|
|
if (!ptr) {
|
|
error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_PATH);
|
|
goto out;
|
|
}
|
|
gconf->path = g_strdup(ptr);
|
|
qemu_opts_del(opts);
|
|
tail = &gconf->server;
|
|
|
|
for (i = 0; i < num_servers; i++) {
|
|
str = g_strdup_printf(GLUSTER_OPT_SERVER_PATTERN"%d.", i);
|
|
qdict_extract_subqdict(options, &backing_options, str);
|
|
|
|
/* create opts info from runtime_type_opts list */
|
|
opts = qemu_opts_create(&runtime_type_opts, NULL, 0, &error_abort);
|
|
if (!qemu_opts_absorb_qdict(opts, backing_options, errp)) {
|
|
goto out;
|
|
}
|
|
|
|
ptr = qemu_opt_get(opts, GLUSTER_OPT_TYPE);
|
|
if (!ptr) {
|
|
error_setg(&local_err, QERR_MISSING_PARAMETER, GLUSTER_OPT_TYPE);
|
|
error_append_hint(&local_err, GERR_INDEX_HINT, i);
|
|
goto out;
|
|
|
|
}
|
|
gsconf = g_new0(SocketAddress, 1);
|
|
if (!strcmp(ptr, "tcp")) {
|
|
ptr = "inet"; /* accept legacy "tcp" */
|
|
}
|
|
type = qapi_enum_parse(&SocketAddressType_lookup, ptr, -1, NULL);
|
|
if (type != SOCKET_ADDRESS_TYPE_INET
|
|
&& type != SOCKET_ADDRESS_TYPE_UNIX) {
|
|
error_setg(&local_err,
|
|
"Parameter '%s' may be 'inet' or 'unix'",
|
|
GLUSTER_OPT_TYPE);
|
|
error_append_hint(&local_err, GERR_INDEX_HINT, i);
|
|
goto out;
|
|
}
|
|
gsconf->type = type;
|
|
qemu_opts_del(opts);
|
|
|
|
if (gsconf->type == SOCKET_ADDRESS_TYPE_INET) {
|
|
/* create opts info from runtime_inet_opts list */
|
|
opts = qemu_opts_create(&runtime_inet_opts, NULL, 0, &error_abort);
|
|
if (!qemu_opts_absorb_qdict(opts, backing_options, errp)) {
|
|
goto out;
|
|
}
|
|
|
|
ptr = qemu_opt_get(opts, GLUSTER_OPT_HOST);
|
|
if (!ptr) {
|
|
error_setg(&local_err, QERR_MISSING_PARAMETER,
|
|
GLUSTER_OPT_HOST);
|
|
error_append_hint(&local_err, GERR_INDEX_HINT, i);
|
|
goto out;
|
|
}
|
|
gsconf->u.inet.host = g_strdup(ptr);
|
|
ptr = qemu_opt_get(opts, GLUSTER_OPT_PORT);
|
|
if (!ptr) {
|
|
error_setg(&local_err, QERR_MISSING_PARAMETER,
|
|
GLUSTER_OPT_PORT);
|
|
error_append_hint(&local_err, GERR_INDEX_HINT, i);
|
|
goto out;
|
|
}
|
|
gsconf->u.inet.port = g_strdup(ptr);
|
|
|
|
/* defend for unsupported fields in InetSocketAddress,
|
|
* i.e. @ipv4, @ipv6 and @to
|
|
*/
|
|
ptr = qemu_opt_get(opts, GLUSTER_OPT_TO);
|
|
if (ptr) {
|
|
gsconf->u.inet.has_to = true;
|
|
}
|
|
ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV4);
|
|
if (ptr) {
|
|
gsconf->u.inet.has_ipv4 = true;
|
|
}
|
|
ptr = qemu_opt_get(opts, GLUSTER_OPT_IPV6);
|
|
if (ptr) {
|
|
gsconf->u.inet.has_ipv6 = true;
|
|
}
|
|
if (gsconf->u.inet.has_to) {
|
|
error_setg(&local_err, "Parameter 'to' not supported");
|
|
goto out;
|
|
}
|
|
if (gsconf->u.inet.has_ipv4 || gsconf->u.inet.has_ipv6) {
|
|
error_setg(&local_err, "Parameters 'ipv4/ipv6' not supported");
|
|
goto out;
|
|
}
|
|
qemu_opts_del(opts);
|
|
} else {
|
|
/* create opts info from runtime_unix_opts list */
|
|
opts = qemu_opts_create(&runtime_unix_opts, NULL, 0, &error_abort);
|
|
if (!qemu_opts_absorb_qdict(opts, backing_options, errp)) {
|
|
goto out;
|
|
}
|
|
|
|
ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH);
|
|
if (!ptr) {
|
|
ptr = qemu_opt_get(opts, GLUSTER_OPT_SOCKET);
|
|
} else if (qemu_opt_get(opts, GLUSTER_OPT_SOCKET)) {
|
|
error_setg(&local_err,
|
|
"Conflicting parameters 'path' and 'socket'");
|
|
error_append_hint(&local_err, GERR_INDEX_HINT, i);
|
|
goto out;
|
|
}
|
|
if (!ptr) {
|
|
error_setg(&local_err, QERR_MISSING_PARAMETER,
|
|
GLUSTER_OPT_PATH);
|
|
error_append_hint(&local_err, GERR_INDEX_HINT, i);
|
|
goto out;
|
|
}
|
|
gsconf->u.q_unix.path = g_strdup(ptr);
|
|
qemu_opts_del(opts);
|
|
}
|
|
|
|
QAPI_LIST_APPEND(tail, gsconf);
|
|
gsconf = NULL;
|
|
|
|
qobject_unref(backing_options);
|
|
backing_options = NULL;
|
|
g_free(str);
|
|
str = NULL;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out:
|
|
error_propagate(errp, local_err);
|
|
qapi_free_SocketAddress(gsconf);
|
|
qemu_opts_del(opts);
|
|
g_free(str);
|
|
qobject_unref(backing_options);
|
|
errno = EINVAL;
|
|
return -errno;
|
|
}
|
|
|
|
/* Converts options given in @filename and the @options QDict into the QAPI
|
|
* object @gconf. */
|
|
static int qemu_gluster_parse(BlockdevOptionsGluster *gconf,
|
|
const char *filename,
|
|
QDict *options, Error **errp)
|
|
{
|
|
int ret;
|
|
if (filename) {
|
|
ret = qemu_gluster_parse_uri(gconf, filename);
|
|
if (ret < 0) {
|
|
error_setg(errp, "invalid URI %s", filename);
|
|
error_append_hint(errp, "Usage: file=gluster[+transport]://"
|
|
"[host[:port]]volume/path[?socket=...]"
|
|
"[,file.debug=N]"
|
|
"[,file.logfile=/path/filename.log]\n");
|
|
return ret;
|
|
}
|
|
} else {
|
|
ret = qemu_gluster_parse_json(gconf, options, errp);
|
|
if (ret < 0) {
|
|
error_append_hint(errp, "Usage: "
|
|
"-drive driver=qcow2,file.driver=gluster,"
|
|
"file.volume=testvol,file.path=/path/a.qcow2"
|
|
"[,file.debug=9]"
|
|
"[,file.logfile=/path/filename.log],"
|
|
"file.server.0.type=inet,"
|
|
"file.server.0.host=1.2.3.4,"
|
|
"file.server.0.port=24007,"
|
|
"file.server.1.transport=unix,"
|
|
"file.server.1.path=/var/run/glusterd.socket ..."
|
|
"\n");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct glfs *qemu_gluster_init(BlockdevOptionsGluster *gconf,
|
|
const char *filename,
|
|
QDict *options, Error **errp)
|
|
{
|
|
int ret;
|
|
|
|
ret = qemu_gluster_parse(gconf, filename, options, errp);
|
|
if (ret < 0) {
|
|
errno = -ret;
|
|
return NULL;
|
|
}
|
|
|
|
return qemu_gluster_glfs_init(gconf, errp);
|
|
}
|
|
|
|
/*
|
|
* AIO callback routine called from GlusterFS thread.
|
|
*/
|
|
static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret,
|
|
#ifdef CONFIG_GLUSTERFS_IOCB_HAS_STAT
|
|
struct glfs_stat *pre, struct glfs_stat *post,
|
|
#endif
|
|
void *arg)
|
|
{
|
|
GlusterAIOCB *acb = (GlusterAIOCB *)arg;
|
|
|
|
if (!ret || ret == acb->size) {
|
|
acb->ret = 0; /* Success */
|
|
} else if (ret < 0) {
|
|
acb->ret = -errno; /* Read/Write failed */
|
|
} else {
|
|
acb->ret = -EIO; /* Partial read/write - fail it */
|
|
}
|
|
|
|
aio_co_schedule(acb->aio_context, acb->coroutine);
|
|
}
|
|
|
|
static void qemu_gluster_parse_flags(int bdrv_flags, int *open_flags)
|
|
{
|
|
assert(open_flags != NULL);
|
|
|
|
*open_flags |= O_BINARY;
|
|
|
|
if (bdrv_flags & BDRV_O_RDWR) {
|
|
*open_flags |= O_RDWR;
|
|
} else {
|
|
*open_flags |= O_RDONLY;
|
|
}
|
|
|
|
if ((bdrv_flags & BDRV_O_NOCACHE)) {
|
|
*open_flags |= O_DIRECT;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Do SEEK_DATA/HOLE to detect if it is functional. Older broken versions of
|
|
* gfapi incorrectly return the current offset when SEEK_DATA/HOLE is used.
|
|
* - Corrected versions return -1 and set errno to EINVAL.
|
|
* - Versions that support SEEK_DATA/HOLE correctly, will return -1 and set
|
|
* errno to ENXIO when SEEK_DATA is called with a position of EOF.
|
|
*/
|
|
static bool qemu_gluster_test_seek(struct glfs_fd *fd)
|
|
{
|
|
off_t ret = 0;
|
|
|
|
#if defined SEEK_HOLE && defined SEEK_DATA
|
|
off_t eof;
|
|
|
|
eof = glfs_lseek(fd, 0, SEEK_END);
|
|
if (eof < 0) {
|
|
/* this should never occur */
|
|
return false;
|
|
}
|
|
|
|
/* this should always fail with ENXIO if SEEK_DATA is supported */
|
|
ret = glfs_lseek(fd, eof, SEEK_DATA);
|
|
#endif
|
|
|
|
return (ret < 0) && (errno == ENXIO);
|
|
}
|
|
|
|
static int qemu_gluster_open(BlockDriverState *bs, QDict *options,
|
|
int bdrv_flags, Error **errp)
|
|
{
|
|
BDRVGlusterState *s = bs->opaque;
|
|
int open_flags = 0;
|
|
int ret = 0;
|
|
BlockdevOptionsGluster *gconf = NULL;
|
|
QemuOpts *opts;
|
|
const char *filename, *logfile;
|
|
|
|
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
|
|
if (!qemu_opts_absorb_qdict(opts, options, errp)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
filename = qemu_opt_get(opts, GLUSTER_OPT_FILENAME);
|
|
|
|
s->debug = qemu_opt_get_number(opts, GLUSTER_OPT_DEBUG,
|
|
GLUSTER_DEBUG_DEFAULT);
|
|
if (s->debug < 0) {
|
|
s->debug = 0;
|
|
} else if (s->debug > GLUSTER_DEBUG_MAX) {
|
|
s->debug = GLUSTER_DEBUG_MAX;
|
|
}
|
|
|
|
gconf = g_new0(BlockdevOptionsGluster, 1);
|
|
gconf->debug = s->debug;
|
|
gconf->has_debug = true;
|
|
|
|
logfile = qemu_opt_get(opts, GLUSTER_OPT_LOGFILE);
|
|
s->logfile = g_strdup(logfile ? logfile : GLUSTER_LOGFILE_DEFAULT);
|
|
|
|
gconf->logfile = g_strdup(s->logfile);
|
|
gconf->has_logfile = true;
|
|
|
|
s->glfs = qemu_gluster_init(gconf, filename, options, errp);
|
|
if (!s->glfs) {
|
|
ret = -errno;
|
|
goto out;
|
|
}
|
|
|
|
#ifdef CONFIG_GLUSTERFS_XLATOR_OPT
|
|
/* Without this, if fsync fails for a recoverable reason (for instance,
|
|
* ENOSPC), gluster will dump its cache, preventing retries. This means
|
|
* almost certain data loss. Not all gluster versions support the
|
|
* 'resync-failed-syncs-after-fsync' key value, but there is no way to
|
|
* discover during runtime if it is supported (this api returns success for
|
|
* unknown key/value pairs) */
|
|
ret = glfs_set_xlator_option(s->glfs, "*-write-behind",
|
|
"resync-failed-syncs-after-fsync",
|
|
"on");
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, errno, "Unable to set xlator key/value pair");
|
|
ret = -errno;
|
|
goto out;
|
|
}
|
|
#endif
|
|
|
|
qemu_gluster_parse_flags(bdrv_flags, &open_flags);
|
|
|
|
s->fd = glfs_open(s->glfs, gconf->path, open_flags);
|
|
ret = s->fd ? 0 : -errno;
|
|
|
|
if (ret == -EACCES || ret == -EROFS) {
|
|
/* Try to degrade to read-only, but if it doesn't work, still use the
|
|
* normal error message. */
|
|
if (bdrv_apply_auto_read_only(bs, NULL, NULL) == 0) {
|
|
open_flags = (open_flags & ~O_RDWR) | O_RDONLY;
|
|
s->fd = glfs_open(s->glfs, gconf->path, open_flags);
|
|
ret = s->fd ? 0 : -errno;
|
|
}
|
|
}
|
|
|
|
s->supports_seek_data = qemu_gluster_test_seek(s->fd);
|
|
|
|
out:
|
|
qemu_opts_del(opts);
|
|
qapi_free_BlockdevOptionsGluster(gconf);
|
|
if (!ret) {
|
|
return ret;
|
|
}
|
|
g_free(s->logfile);
|
|
if (s->fd) {
|
|
glfs_close(s->fd);
|
|
}
|
|
|
|
glfs_clear_preopened(s->glfs);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void qemu_gluster_refresh_limits(BlockDriverState *bs, Error **errp)
|
|
{
|
|
bs->bl.max_transfer = GLUSTER_MAX_TRANSFER;
|
|
bs->bl.max_pdiscard = MIN(SIZE_MAX, INT64_MAX);
|
|
}
|
|
|
|
static int qemu_gluster_reopen_prepare(BDRVReopenState *state,
|
|
BlockReopenQueue *queue, Error **errp)
|
|
{
|
|
int ret = 0;
|
|
BDRVGlusterState *s;
|
|
BDRVGlusterReopenState *reop_s;
|
|
BlockdevOptionsGluster *gconf;
|
|
int open_flags = 0;
|
|
|
|
assert(state != NULL);
|
|
assert(state->bs != NULL);
|
|
|
|
s = state->bs->opaque;
|
|
|
|
state->opaque = g_new0(BDRVGlusterReopenState, 1);
|
|
reop_s = state->opaque;
|
|
|
|
qemu_gluster_parse_flags(state->flags, &open_flags);
|
|
|
|
gconf = g_new0(BlockdevOptionsGluster, 1);
|
|
gconf->debug = s->debug;
|
|
gconf->has_debug = true;
|
|
gconf->logfile = g_strdup(s->logfile);
|
|
gconf->has_logfile = true;
|
|
|
|
/*
|
|
* If 'state->bs->exact_filename' is empty, 'state->options' should contain
|
|
* the JSON parameters already parsed.
|
|
*/
|
|
if (state->bs->exact_filename[0] != '\0') {
|
|
reop_s->glfs = qemu_gluster_init(gconf, state->bs->exact_filename, NULL,
|
|
errp);
|
|
} else {
|
|
reop_s->glfs = qemu_gluster_init(gconf, NULL, state->options, errp);
|
|
}
|
|
if (reop_s->glfs == NULL) {
|
|
ret = -errno;
|
|
goto exit;
|
|
}
|
|
|
|
#ifdef CONFIG_GLUSTERFS_XLATOR_OPT
|
|
ret = glfs_set_xlator_option(reop_s->glfs, "*-write-behind",
|
|
"resync-failed-syncs-after-fsync", "on");
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, errno, "Unable to set xlator key/value pair");
|
|
ret = -errno;
|
|
goto exit;
|
|
}
|
|
#endif
|
|
|
|
reop_s->fd = glfs_open(reop_s->glfs, gconf->path, open_flags);
|
|
if (reop_s->fd == NULL) {
|
|
/* reops->glfs will be cleaned up in _abort */
|
|
ret = -errno;
|
|
goto exit;
|
|
}
|
|
|
|
exit:
|
|
/* state->opaque will be freed in either the _abort or _commit */
|
|
qapi_free_BlockdevOptionsGluster(gconf);
|
|
return ret;
|
|
}
|
|
|
|
static void qemu_gluster_reopen_commit(BDRVReopenState *state)
|
|
{
|
|
BDRVGlusterReopenState *reop_s = state->opaque;
|
|
BDRVGlusterState *s = state->bs->opaque;
|
|
|
|
|
|
/* close the old */
|
|
if (s->fd) {
|
|
glfs_close(s->fd);
|
|
}
|
|
|
|
glfs_clear_preopened(s->glfs);
|
|
|
|
/* use the newly opened image / connection */
|
|
s->fd = reop_s->fd;
|
|
s->glfs = reop_s->glfs;
|
|
|
|
g_free(state->opaque);
|
|
state->opaque = NULL;
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
static void qemu_gluster_reopen_abort(BDRVReopenState *state)
|
|
{
|
|
BDRVGlusterReopenState *reop_s = state->opaque;
|
|
|
|
if (reop_s == NULL) {
|
|
return;
|
|
}
|
|
|
|
if (reop_s->fd) {
|
|
glfs_close(reop_s->fd);
|
|
}
|
|
|
|
glfs_clear_preopened(reop_s->glfs);
|
|
|
|
g_free(state->opaque);
|
|
state->opaque = NULL;
|
|
|
|
return;
|
|
}
|
|
|
|
#ifdef CONFIG_GLUSTERFS_ZEROFILL
|
|
static coroutine_fn int qemu_gluster_co_pwrite_zeroes(BlockDriverState *bs,
|
|
int64_t offset,
|
|
int64_t bytes,
|
|
BdrvRequestFlags flags)
|
|
{
|
|
int ret;
|
|
GlusterAIOCB acb;
|
|
BDRVGlusterState *s = bs->opaque;
|
|
|
|
acb.size = bytes;
|
|
acb.ret = 0;
|
|
acb.coroutine = qemu_coroutine_self();
|
|
acb.aio_context = bdrv_get_aio_context(bs);
|
|
|
|
ret = glfs_zerofill_async(s->fd, offset, bytes, gluster_finish_aiocb, &acb);
|
|
if (ret < 0) {
|
|
return -errno;
|
|
}
|
|
|
|
qemu_coroutine_yield();
|
|
return acb.ret;
|
|
}
|
|
#endif
|
|
|
|
static int qemu_gluster_do_truncate(struct glfs_fd *fd, int64_t offset,
|
|
PreallocMode prealloc, Error **errp)
|
|
{
|
|
int64_t current_length;
|
|
|
|
current_length = glfs_lseek(fd, 0, SEEK_END);
|
|
if (current_length < 0) {
|
|
error_setg_errno(errp, errno, "Failed to determine current size");
|
|
return -errno;
|
|
}
|
|
|
|
if (current_length > offset && prealloc != PREALLOC_MODE_OFF) {
|
|
error_setg(errp, "Cannot use preallocation for shrinking files");
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if (current_length == offset) {
|
|
return 0;
|
|
}
|
|
|
|
switch (prealloc) {
|
|
#ifdef CONFIG_GLUSTERFS_FALLOCATE
|
|
case PREALLOC_MODE_FALLOC:
|
|
if (glfs_fallocate(fd, 0, current_length, offset - current_length)) {
|
|
error_setg_errno(errp, errno, "Could not preallocate data");
|
|
return -errno;
|
|
}
|
|
break;
|
|
#endif /* CONFIG_GLUSTERFS_FALLOCATE */
|
|
#ifdef CONFIG_GLUSTERFS_ZEROFILL
|
|
case PREALLOC_MODE_FULL:
|
|
if (glfs_ftruncate(fd, offset)) {
|
|
error_setg_errno(errp, errno, "Could not resize file");
|
|
return -errno;
|
|
}
|
|
if (glfs_zerofill(fd, current_length, offset - current_length)) {
|
|
error_setg_errno(errp, errno, "Could not zerofill the new area");
|
|
return -errno;
|
|
}
|
|
break;
|
|
#endif /* CONFIG_GLUSTERFS_ZEROFILL */
|
|
case PREALLOC_MODE_OFF:
|
|
if (glfs_ftruncate(fd, offset)) {
|
|
error_setg_errno(errp, errno, "Could not resize file");
|
|
return -errno;
|
|
}
|
|
break;
|
|
default:
|
|
error_setg(errp, "Unsupported preallocation mode: %s",
|
|
PreallocMode_str(prealloc));
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qemu_gluster_co_create(BlockdevCreateOptions *options,
|
|
Error **errp)
|
|
{
|
|
BlockdevCreateOptionsGluster *opts = &options->u.gluster;
|
|
struct glfs *glfs;
|
|
struct glfs_fd *fd = NULL;
|
|
int ret = 0;
|
|
|
|
assert(options->driver == BLOCKDEV_DRIVER_GLUSTER);
|
|
|
|
glfs = qemu_gluster_glfs_init(opts->location, errp);
|
|
if (!glfs) {
|
|
ret = -errno;
|
|
goto out;
|
|
}
|
|
|
|
fd = glfs_creat(glfs, opts->location->path,
|
|
O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR | S_IWUSR);
|
|
if (!fd) {
|
|
ret = -errno;
|
|
goto out;
|
|
}
|
|
|
|
ret = qemu_gluster_do_truncate(fd, opts->size, opts->preallocation, errp);
|
|
|
|
out:
|
|
if (fd) {
|
|
if (glfs_close(fd) != 0 && ret == 0) {
|
|
ret = -errno;
|
|
}
|
|
}
|
|
glfs_clear_preopened(glfs);
|
|
return ret;
|
|
}
|
|
|
|
static int coroutine_fn qemu_gluster_co_create_opts(BlockDriver *drv,
|
|
const char *filename,
|
|
QemuOpts *opts,
|
|
Error **errp)
|
|
{
|
|
BlockdevCreateOptions *options;
|
|
BlockdevCreateOptionsGluster *gopts;
|
|
BlockdevOptionsGluster *gconf;
|
|
char *tmp = NULL;
|
|
Error *local_err = NULL;
|
|
int ret;
|
|
|
|
options = g_new0(BlockdevCreateOptions, 1);
|
|
options->driver = BLOCKDEV_DRIVER_GLUSTER;
|
|
gopts = &options->u.gluster;
|
|
|
|
gconf = g_new0(BlockdevOptionsGluster, 1);
|
|
gopts->location = gconf;
|
|
|
|
gopts->size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
|
|
BDRV_SECTOR_SIZE);
|
|
|
|
tmp = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC);
|
|
gopts->preallocation = qapi_enum_parse(&PreallocMode_lookup, tmp,
|
|
PREALLOC_MODE_OFF, &local_err);
|
|
g_free(tmp);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
gconf->debug = qemu_opt_get_number_del(opts, GLUSTER_OPT_DEBUG,
|
|
GLUSTER_DEBUG_DEFAULT);
|
|
if (gconf->debug < 0) {
|
|
gconf->debug = 0;
|
|
} else if (gconf->debug > GLUSTER_DEBUG_MAX) {
|
|
gconf->debug = GLUSTER_DEBUG_MAX;
|
|
}
|
|
gconf->has_debug = true;
|
|
|
|
gconf->logfile = qemu_opt_get_del(opts, GLUSTER_OPT_LOGFILE);
|
|
if (!gconf->logfile) {
|
|
gconf->logfile = g_strdup(GLUSTER_LOGFILE_DEFAULT);
|
|
}
|
|
gconf->has_logfile = true;
|
|
|
|
ret = qemu_gluster_parse(gconf, filename, NULL, errp);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
ret = qemu_gluster_co_create(options, errp);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
|
|
ret = 0;
|
|
fail:
|
|
qapi_free_BlockdevCreateOptions(options);
|
|
return ret;
|
|
}
|
|
|
|
static coroutine_fn int qemu_gluster_co_rw(BlockDriverState *bs,
|
|
int64_t sector_num, int nb_sectors,
|
|
QEMUIOVector *qiov, int write)
|
|
{
|
|
int ret;
|
|
GlusterAIOCB acb;
|
|
BDRVGlusterState *s = bs->opaque;
|
|
size_t size = nb_sectors * BDRV_SECTOR_SIZE;
|
|
off_t offset = sector_num * BDRV_SECTOR_SIZE;
|
|
|
|
acb.size = size;
|
|
acb.ret = 0;
|
|
acb.coroutine = qemu_coroutine_self();
|
|
acb.aio_context = bdrv_get_aio_context(bs);
|
|
|
|
if (write) {
|
|
ret = glfs_pwritev_async(s->fd, qiov->iov, qiov->niov, offset, 0,
|
|
gluster_finish_aiocb, &acb);
|
|
} else {
|
|
ret = glfs_preadv_async(s->fd, qiov->iov, qiov->niov, offset, 0,
|
|
gluster_finish_aiocb, &acb);
|
|
}
|
|
|
|
if (ret < 0) {
|
|
return -errno;
|
|
}
|
|
|
|
qemu_coroutine_yield();
|
|
return acb.ret;
|
|
}
|
|
|
|
static coroutine_fn int qemu_gluster_co_truncate(BlockDriverState *bs,
|
|
int64_t offset,
|
|
bool exact,
|
|
PreallocMode prealloc,
|
|
BdrvRequestFlags flags,
|
|
Error **errp)
|
|
{
|
|
BDRVGlusterState *s = bs->opaque;
|
|
return qemu_gluster_do_truncate(s->fd, offset, prealloc, errp);
|
|
}
|
|
|
|
static coroutine_fn int qemu_gluster_co_readv(BlockDriverState *bs,
|
|
int64_t sector_num,
|
|
int nb_sectors,
|
|
QEMUIOVector *qiov)
|
|
{
|
|
return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 0);
|
|
}
|
|
|
|
static coroutine_fn int qemu_gluster_co_writev(BlockDriverState *bs,
|
|
int64_t sector_num,
|
|
int nb_sectors,
|
|
QEMUIOVector *qiov,
|
|
int flags)
|
|
{
|
|
return qemu_gluster_co_rw(bs, sector_num, nb_sectors, qiov, 1);
|
|
}
|
|
|
|
static void qemu_gluster_close(BlockDriverState *bs)
|
|
{
|
|
BDRVGlusterState *s = bs->opaque;
|
|
|
|
g_free(s->logfile);
|
|
if (s->fd) {
|
|
glfs_close(s->fd);
|
|
s->fd = NULL;
|
|
}
|
|
glfs_clear_preopened(s->glfs);
|
|
}
|
|
|
|
static coroutine_fn int qemu_gluster_co_flush_to_disk(BlockDriverState *bs)
|
|
{
|
|
int ret;
|
|
GlusterAIOCB acb;
|
|
BDRVGlusterState *s = bs->opaque;
|
|
|
|
acb.size = 0;
|
|
acb.ret = 0;
|
|
acb.coroutine = qemu_coroutine_self();
|
|
acb.aio_context = bdrv_get_aio_context(bs);
|
|
|
|
ret = glfs_fsync_async(s->fd, gluster_finish_aiocb, &acb);
|
|
if (ret < 0) {
|
|
ret = -errno;
|
|
goto error;
|
|
}
|
|
|
|
qemu_coroutine_yield();
|
|
if (acb.ret < 0) {
|
|
ret = acb.ret;
|
|
goto error;
|
|
}
|
|
|
|
return acb.ret;
|
|
|
|
error:
|
|
/* Some versions of Gluster (3.5.6 -> 3.5.8?) will not retain its cache
|
|
* after a fsync failure, so we have no way of allowing the guest to safely
|
|
* continue. Gluster versions prior to 3.5.6 don't retain the cache
|
|
* either, but will invalidate the fd on error, so this is again our only
|
|
* option.
|
|
*
|
|
* The 'resync-failed-syncs-after-fsync' xlator option for the
|
|
* write-behind cache will cause later gluster versions to retain its
|
|
* cache after error, so long as the fd remains open. However, we
|
|
* currently have no way of knowing if this option is supported.
|
|
*
|
|
* TODO: Once gluster provides a way for us to determine if the option
|
|
* is supported, bypass the closure and setting drv to NULL. */
|
|
qemu_gluster_close(bs);
|
|
bs->drv = NULL;
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_GLUSTERFS_DISCARD
|
|
static coroutine_fn int qemu_gluster_co_pdiscard(BlockDriverState *bs,
|
|
int64_t offset, int64_t bytes)
|
|
{
|
|
int ret;
|
|
GlusterAIOCB acb;
|
|
BDRVGlusterState *s = bs->opaque;
|
|
|
|
assert(bytes <= SIZE_MAX); /* rely on max_pdiscard */
|
|
|
|
acb.size = 0;
|
|
acb.ret = 0;
|
|
acb.coroutine = qemu_coroutine_self();
|
|
acb.aio_context = bdrv_get_aio_context(bs);
|
|
|
|
ret = glfs_discard_async(s->fd, offset, bytes, gluster_finish_aiocb, &acb);
|
|
if (ret < 0) {
|
|
return -errno;
|
|
}
|
|
|
|
qemu_coroutine_yield();
|
|
return acb.ret;
|
|
}
|
|
#endif
|
|
|
|
static int64_t qemu_gluster_getlength(BlockDriverState *bs)
|
|
{
|
|
BDRVGlusterState *s = bs->opaque;
|
|
int64_t ret;
|
|
|
|
ret = glfs_lseek(s->fd, 0, SEEK_END);
|
|
if (ret < 0) {
|
|
return -errno;
|
|
} else {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
static int64_t qemu_gluster_allocated_file_size(BlockDriverState *bs)
|
|
{
|
|
BDRVGlusterState *s = bs->opaque;
|
|
struct stat st;
|
|
int ret;
|
|
|
|
ret = glfs_fstat(s->fd, &st);
|
|
if (ret < 0) {
|
|
return -errno;
|
|
} else {
|
|
return st.st_blocks * 512;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Find allocation range in @bs around offset @start.
|
|
* May change underlying file descriptor's file offset.
|
|
* If @start is not in a hole, store @start in @data, and the
|
|
* beginning of the next hole in @hole, and return 0.
|
|
* If @start is in a non-trailing hole, store @start in @hole and the
|
|
* beginning of the next non-hole in @data, and return 0.
|
|
* If @start is in a trailing hole or beyond EOF, return -ENXIO.
|
|
* If we can't find out, return a negative errno other than -ENXIO.
|
|
*
|
|
* (Shamefully copied from file-posix.c, only minuscule adaptions.)
|
|
*/
|
|
static int find_allocation(BlockDriverState *bs, off_t start,
|
|
off_t *data, off_t *hole)
|
|
{
|
|
BDRVGlusterState *s = bs->opaque;
|
|
|
|
if (!s->supports_seek_data) {
|
|
goto exit;
|
|
}
|
|
|
|
#if defined SEEK_HOLE && defined SEEK_DATA
|
|
off_t offs;
|
|
|
|
/*
|
|
* SEEK_DATA cases:
|
|
* D1. offs == start: start is in data
|
|
* D2. offs > start: start is in a hole, next data at offs
|
|
* D3. offs < 0, errno = ENXIO: either start is in a trailing hole
|
|
* or start is beyond EOF
|
|
* If the latter happens, the file has been truncated behind
|
|
* our back since we opened it. All bets are off then.
|
|
* Treating like a trailing hole is simplest.
|
|
* D4. offs < 0, errno != ENXIO: we learned nothing
|
|
*/
|
|
offs = glfs_lseek(s->fd, start, SEEK_DATA);
|
|
if (offs < 0) {
|
|
return -errno; /* D3 or D4 */
|
|
}
|
|
|
|
if (offs < start) {
|
|
/* This is not a valid return by lseek(). We are safe to just return
|
|
* -EIO in this case, and we'll treat it like D4. Unfortunately some
|
|
* versions of gluster server will return offs < start, so an assert
|
|
* here will unnecessarily abort QEMU. */
|
|
return -EIO;
|
|
}
|
|
|
|
if (offs > start) {
|
|
/* D2: in hole, next data at offs */
|
|
*hole = start;
|
|
*data = offs;
|
|
return 0;
|
|
}
|
|
|
|
/* D1: in data, end not yet known */
|
|
|
|
/*
|
|
* SEEK_HOLE cases:
|
|
* H1. offs == start: start is in a hole
|
|
* If this happens here, a hole has been dug behind our back
|
|
* since the previous lseek().
|
|
* H2. offs > start: either start is in data, next hole at offs,
|
|
* or start is in trailing hole, EOF at offs
|
|
* Linux treats trailing holes like any other hole: offs ==
|
|
* start. Solaris seeks to EOF instead: offs > start (blech).
|
|
* If that happens here, a hole has been dug behind our back
|
|
* since the previous lseek().
|
|
* H3. offs < 0, errno = ENXIO: start is beyond EOF
|
|
* If this happens, the file has been truncated behind our
|
|
* back since we opened it. Treat it like a trailing hole.
|
|
* H4. offs < 0, errno != ENXIO: we learned nothing
|
|
* Pretend we know nothing at all, i.e. "forget" about D1.
|
|
*/
|
|
offs = glfs_lseek(s->fd, start, SEEK_HOLE);
|
|
if (offs < 0) {
|
|
return -errno; /* D1 and (H3 or H4) */
|
|
}
|
|
|
|
if (offs < start) {
|
|
/* This is not a valid return by lseek(). We are safe to just return
|
|
* -EIO in this case, and we'll treat it like H4. Unfortunately some
|
|
* versions of gluster server will return offs < start, so an assert
|
|
* here will unnecessarily abort QEMU. */
|
|
return -EIO;
|
|
}
|
|
|
|
if (offs > start) {
|
|
/*
|
|
* D1 and H2: either in data, next hole at offs, or it was in
|
|
* data but is now in a trailing hole. In the latter case,
|
|
* all bets are off. Treating it as if it there was data all
|
|
* the way to EOF is safe, so simply do that.
|
|
*/
|
|
*data = start;
|
|
*hole = offs;
|
|
return 0;
|
|
}
|
|
|
|
/* D1 and H1 */
|
|
return -EBUSY;
|
|
#endif
|
|
|
|
exit:
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
/*
|
|
* Returns the allocation status of the specified offset.
|
|
*
|
|
* The block layer guarantees 'offset' and 'bytes' are within bounds.
|
|
*
|
|
* 'pnum' is set to the number of bytes (including and immediately following
|
|
* the specified offset) that are known to be in the same
|
|
* allocated/unallocated state.
|
|
*
|
|
* 'bytes' is a soft cap for 'pnum'. If the information is free, 'pnum' may
|
|
* well exceed it.
|
|
*
|
|
* (Based on raw_co_block_status() from file-posix.c.)
|
|
*/
|
|
static int coroutine_fn qemu_gluster_co_block_status(BlockDriverState *bs,
|
|
bool want_zero,
|
|
int64_t offset,
|
|
int64_t bytes,
|
|
int64_t *pnum,
|
|
int64_t *map,
|
|
BlockDriverState **file)
|
|
{
|
|
BDRVGlusterState *s = bs->opaque;
|
|
off_t data = 0, hole = 0;
|
|
int ret = -EINVAL;
|
|
|
|
assert(QEMU_IS_ALIGNED(offset | bytes, bs->bl.request_alignment));
|
|
|
|
if (!s->fd) {
|
|
return ret;
|
|
}
|
|
|
|
if (!want_zero) {
|
|
*pnum = bytes;
|
|
*map = offset;
|
|
*file = bs;
|
|
return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
|
|
}
|
|
|
|
ret = find_allocation(bs, offset, &data, &hole);
|
|
if (ret == -ENXIO) {
|
|
/* Trailing hole */
|
|
*pnum = bytes;
|
|
ret = BDRV_BLOCK_ZERO;
|
|
} else if (ret < 0) {
|
|
/* No info available, so pretend there are no holes */
|
|
*pnum = bytes;
|
|
ret = BDRV_BLOCK_DATA;
|
|
} else if (data == offset) {
|
|
/* On a data extent, compute bytes to the end of the extent,
|
|
* possibly including a partial sector at EOF. */
|
|
*pnum = hole - offset;
|
|
|
|
/*
|
|
* We are not allowed to return partial sectors, though, so
|
|
* round up if necessary.
|
|
*/
|
|
if (!QEMU_IS_ALIGNED(*pnum, bs->bl.request_alignment)) {
|
|
int64_t file_length = qemu_gluster_getlength(bs);
|
|
if (file_length > 0) {
|
|
/* Ignore errors, this is just a safeguard */
|
|
assert(hole == file_length);
|
|
}
|
|
*pnum = ROUND_UP(*pnum, bs->bl.request_alignment);
|
|
}
|
|
|
|
ret = BDRV_BLOCK_DATA;
|
|
} else {
|
|
/* On a hole, compute bytes to the beginning of the next extent. */
|
|
assert(hole == offset);
|
|
*pnum = data - offset;
|
|
ret = BDRV_BLOCK_ZERO;
|
|
}
|
|
|
|
*map = offset;
|
|
*file = bs;
|
|
|
|
return ret | BDRV_BLOCK_OFFSET_VALID;
|
|
}
|
|
|
|
|
|
static const char *const gluster_strong_open_opts[] = {
|
|
GLUSTER_OPT_VOLUME,
|
|
GLUSTER_OPT_PATH,
|
|
GLUSTER_OPT_TYPE,
|
|
GLUSTER_OPT_SERVER_PATTERN,
|
|
GLUSTER_OPT_HOST,
|
|
GLUSTER_OPT_PORT,
|
|
GLUSTER_OPT_TO,
|
|
GLUSTER_OPT_IPV4,
|
|
GLUSTER_OPT_IPV6,
|
|
GLUSTER_OPT_SOCKET,
|
|
|
|
NULL
|
|
};
|
|
|
|
static BlockDriver bdrv_gluster = {
|
|
.format_name = "gluster",
|
|
.protocol_name = "gluster",
|
|
.instance_size = sizeof(BDRVGlusterState),
|
|
.bdrv_file_open = qemu_gluster_open,
|
|
.bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
|
|
.bdrv_reopen_commit = qemu_gluster_reopen_commit,
|
|
.bdrv_reopen_abort = qemu_gluster_reopen_abort,
|
|
.bdrv_close = qemu_gluster_close,
|
|
.bdrv_co_create = qemu_gluster_co_create,
|
|
.bdrv_co_create_opts = qemu_gluster_co_create_opts,
|
|
.bdrv_getlength = qemu_gluster_getlength,
|
|
.bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
|
|
.bdrv_co_truncate = qemu_gluster_co_truncate,
|
|
.bdrv_co_readv = qemu_gluster_co_readv,
|
|
.bdrv_co_writev = qemu_gluster_co_writev,
|
|
.bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
|
|
#ifdef CONFIG_GLUSTERFS_DISCARD
|
|
.bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
|
|
#endif
|
|
#ifdef CONFIG_GLUSTERFS_ZEROFILL
|
|
.bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
|
|
#endif
|
|
.bdrv_co_block_status = qemu_gluster_co_block_status,
|
|
.bdrv_refresh_limits = qemu_gluster_refresh_limits,
|
|
.create_opts = &qemu_gluster_create_opts,
|
|
.strong_runtime_opts = gluster_strong_open_opts,
|
|
};
|
|
|
|
static BlockDriver bdrv_gluster_tcp = {
|
|
.format_name = "gluster",
|
|
.protocol_name = "gluster+tcp",
|
|
.instance_size = sizeof(BDRVGlusterState),
|
|
.bdrv_file_open = qemu_gluster_open,
|
|
.bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
|
|
.bdrv_reopen_commit = qemu_gluster_reopen_commit,
|
|
.bdrv_reopen_abort = qemu_gluster_reopen_abort,
|
|
.bdrv_close = qemu_gluster_close,
|
|
.bdrv_co_create = qemu_gluster_co_create,
|
|
.bdrv_co_create_opts = qemu_gluster_co_create_opts,
|
|
.bdrv_getlength = qemu_gluster_getlength,
|
|
.bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
|
|
.bdrv_co_truncate = qemu_gluster_co_truncate,
|
|
.bdrv_co_readv = qemu_gluster_co_readv,
|
|
.bdrv_co_writev = qemu_gluster_co_writev,
|
|
.bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
|
|
#ifdef CONFIG_GLUSTERFS_DISCARD
|
|
.bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
|
|
#endif
|
|
#ifdef CONFIG_GLUSTERFS_ZEROFILL
|
|
.bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
|
|
#endif
|
|
.bdrv_co_block_status = qemu_gluster_co_block_status,
|
|
.bdrv_refresh_limits = qemu_gluster_refresh_limits,
|
|
.create_opts = &qemu_gluster_create_opts,
|
|
.strong_runtime_opts = gluster_strong_open_opts,
|
|
};
|
|
|
|
static BlockDriver bdrv_gluster_unix = {
|
|
.format_name = "gluster",
|
|
.protocol_name = "gluster+unix",
|
|
.instance_size = sizeof(BDRVGlusterState),
|
|
.bdrv_file_open = qemu_gluster_open,
|
|
.bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
|
|
.bdrv_reopen_commit = qemu_gluster_reopen_commit,
|
|
.bdrv_reopen_abort = qemu_gluster_reopen_abort,
|
|
.bdrv_close = qemu_gluster_close,
|
|
.bdrv_co_create = qemu_gluster_co_create,
|
|
.bdrv_co_create_opts = qemu_gluster_co_create_opts,
|
|
.bdrv_getlength = qemu_gluster_getlength,
|
|
.bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
|
|
.bdrv_co_truncate = qemu_gluster_co_truncate,
|
|
.bdrv_co_readv = qemu_gluster_co_readv,
|
|
.bdrv_co_writev = qemu_gluster_co_writev,
|
|
.bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
|
|
#ifdef CONFIG_GLUSTERFS_DISCARD
|
|
.bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
|
|
#endif
|
|
#ifdef CONFIG_GLUSTERFS_ZEROFILL
|
|
.bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
|
|
#endif
|
|
.bdrv_co_block_status = qemu_gluster_co_block_status,
|
|
.bdrv_refresh_limits = qemu_gluster_refresh_limits,
|
|
.create_opts = &qemu_gluster_create_opts,
|
|
.strong_runtime_opts = gluster_strong_open_opts,
|
|
};
|
|
|
|
/* rdma is deprecated (actually never supported for volfile fetch).
|
|
* Let's maintain it for the protocol compatibility, to make sure things
|
|
* won't break immediately. For now, gluster+rdma will fall back to gluster+tcp
|
|
* protocol with a warning.
|
|
* TODO: remove gluster+rdma interface support
|
|
*/
|
|
static BlockDriver bdrv_gluster_rdma = {
|
|
.format_name = "gluster",
|
|
.protocol_name = "gluster+rdma",
|
|
.instance_size = sizeof(BDRVGlusterState),
|
|
.bdrv_file_open = qemu_gluster_open,
|
|
.bdrv_reopen_prepare = qemu_gluster_reopen_prepare,
|
|
.bdrv_reopen_commit = qemu_gluster_reopen_commit,
|
|
.bdrv_reopen_abort = qemu_gluster_reopen_abort,
|
|
.bdrv_close = qemu_gluster_close,
|
|
.bdrv_co_create = qemu_gluster_co_create,
|
|
.bdrv_co_create_opts = qemu_gluster_co_create_opts,
|
|
.bdrv_getlength = qemu_gluster_getlength,
|
|
.bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
|
|
.bdrv_co_truncate = qemu_gluster_co_truncate,
|
|
.bdrv_co_readv = qemu_gluster_co_readv,
|
|
.bdrv_co_writev = qemu_gluster_co_writev,
|
|
.bdrv_co_flush_to_disk = qemu_gluster_co_flush_to_disk,
|
|
#ifdef CONFIG_GLUSTERFS_DISCARD
|
|
.bdrv_co_pdiscard = qemu_gluster_co_pdiscard,
|
|
#endif
|
|
#ifdef CONFIG_GLUSTERFS_ZEROFILL
|
|
.bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
|
|
#endif
|
|
.bdrv_co_block_status = qemu_gluster_co_block_status,
|
|
.bdrv_refresh_limits = qemu_gluster_refresh_limits,
|
|
.create_opts = &qemu_gluster_create_opts,
|
|
.strong_runtime_opts = gluster_strong_open_opts,
|
|
};
|
|
|
|
static void bdrv_gluster_init(void)
|
|
{
|
|
bdrv_register(&bdrv_gluster_rdma);
|
|
bdrv_register(&bdrv_gluster_unix);
|
|
bdrv_register(&bdrv_gluster_tcp);
|
|
bdrv_register(&bdrv_gluster);
|
|
}
|
|
|
|
block_init(bdrv_gluster_init);
|