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xemu/block/gluster.c
Stefan Hajnoczi e8b6535533 block: add BDRV_REQ_REGISTERED_BUF request flag 
Block drivers may optimize I/O requests accessing buffers previously
registered with bdrv_register_buf(). Checking whether all elements of a
request's QEMUIOVector are within previously registered buffers is
expensive, so we need a hint from the user to avoid costly checks.

Add a BDRV_REQ_REGISTERED_BUF request flag to indicate that all
QEMUIOVector elements in an I/O request are known to be within
previously registered buffers.

Always pass the flag through to driver read/write functions. There is
little harm in passing the flag to a driver that does not use it.
Passing the flag to drivers avoids changes across many block drivers.
Filter drivers would need to explicitly support the flag and pass
through to their children when the children support it. That's a lot of
code changes and it's hard to remember to do that everywhere, leading to
silent reduced performance when the flag is accidentally dropped.

The only problematic scenario with the approach in this patch is when a
driver passes the flag through to internal I/O requests that don't use
the same I/O buffer. In that case the hint may be set when it should
actually be clear. This is a rare case though so the risk is low.

Some drivers have assert(!flags), which no longer works when
BDRV_REQ_REGISTERED_BUF is passed in. These assertions aren't very
useful anyway since the functions are called almost exclusively by
bdrv_driver_preadv/pwritev() so if we get flags handling right there
then the assertion is not needed.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20221013185908.1297568-7-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2022-10-26 14:56:42 -04:00

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/*
* GlusterFS backend for QEMU
*
* Copyright (C) 2012 Bharata B Rao <bharata@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "qemu/units.h"
#include <glusterfs/api/glfs.h>
#include "block/block_int.h"
#include "block/qdict.h"
#include "qapi/error.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qerror.h"
#include "qemu/uri.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "qemu/option.h"
#include "qemu/cutils.h"
#ifdef CONFIG_GLUSTERFS_FTRUNCATE_HAS_STAT
# define glfs_ftruncate(fd, offset) glfs_ftruncate(fd, offset, NULL, NULL)
#endif
#define GLUSTER_OPT_FILENAME "filename"
#define GLUSTER_OPT_VOLUME "volume"
#define GLUSTER_OPT_PATH "path"
#define GLUSTER_OPT_TYPE "type"
#define GLUSTER_OPT_SERVER_PATTERN "server."
#define GLUSTER_OPT_HOST "host"
#define GLUSTER_OPT_PORT "port"
#define GLUSTER_OPT_TO "to"
#define GLUSTER_OPT_IPV4 "ipv4"
#define GLUSTER_OPT_IPV6 "ipv6"
#define GLUSTER_OPT_SOCKET "socket"
#define GLUSTER_OPT_DEBUG "debug"
#define GLUSTER_DEFAULT_PORT 24007
#define GLUSTER_DEBUG_DEFAULT 4
#define GLUSTER_DEBUG_MAX 9
#define GLUSTER_OPT_LOGFILE "logfile"
#define GLUSTER_LOGFILE_DEFAULT "-" /* handled in libgfapi as /dev/stderr */
/*
* Several versions of GlusterFS (3.12? -> 6.0.1) fail when the transfer size
* is greater or equal to 1024 MiB, so we are limiting the transfer size to 512
* MiB to avoid this rare issue.
*/
#define GLUSTER_MAX_TRANSFER (512 * MiB)
#define GERR_INDEX_HINT "hint: check in 'server' array index '%d'\n"
typedef struct GlusterAIOCB {
int64_t size;
int ret;
Coroutine *coroutine;
AioContext *aio_context;
} GlusterAIOCB;
typedef struct BDRVGlusterState {
struct glfs *glfs;
struct glfs_fd *fd;
char *logfile;
bool supports_seek_data;
int debug;
} BDRVGlusterState;
typedef struct BDRVGlusterReopenState {
struct glfs *glfs;
struct glfs_fd *fd;
} BDRVGlusterReopenState;
typedef struct GlfsPreopened {
char *volume;
glfs_t *fs;
int ref;
} GlfsPreopened;
typedef struct ListElement {
QLIST_ENTRY(ListElement) list;
GlfsPreopened saved;
} ListElement;
static QLIST_HEAD(, ListElement) glfs_list;
static QemuOptsList qemu_gluster_create_opts = {
.name = "qemu-gluster-create-opts",
.head = QTAILQ_HEAD_INITIALIZER(qemu_gluster_create_opts.head),
.desc = {
{
.name = BLOCK_OPT_SIZE,
.type = QEMU_OPT_SIZE,
.help = "Virtual disk size"
},
{
.name = BLOCK_OPT_PREALLOC,
.type = QEMU_OPT_STRING,
.help = "Preallocation mode (allowed values: off"
#ifdef CONFIG_GLUSTERFS_FALLOCATE
", falloc"
#endif
#ifdef CONFIG_GLUSTERFS_ZEROFILL
", full"
#endif
")"
},
{
.name = GLUSTER_OPT_DEBUG,
.type = QEMU_OPT_NUMBER,
.help = "Gluster log level, valid range is 0-9",
},
{
.name = GLUSTER_OPT_LOGFILE,
.type = QEMU_OPT_STRING,
.help = "Logfile path of libgfapi",
},
{ /* end of list */ }
}
};
static QemuOptsList runtime_opts = {
.name = "gluster",
.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
.desc = {
{
.name = GLUSTER_OPT_FILENAME,
.type = QEMU_OPT_STRING,
.help = "URL to the gluster image",
},
{
.name = GLUSTER_OPT_DEBUG,
.type = QEMU_OPT_NUMBER,
.help = "Gluster log level, valid range is 0-9",
},
{
.name = GLUSTER_OPT_LOGFILE,
.type = QEMU_OPT_STRING,
.help = "Logfile path of libgfapi",
},
{ /* end of list */ }
},
};
static QemuOptsList runtime_json_opts = {
.name = "gluster_json",
.head = QTAILQ_HEAD_INITIALIZER(runtime_json_opts.head),
.desc = {
{
.name = GLUSTER_OPT_VOLUME,
.type = QEMU_OPT_STRING,
.help = "name of gluster volume where VM image resides",
},
{
.name = GLUSTER_OPT_PATH,
.type = QEMU_OPT_STRING,
.help = "absolute path to image file in gluster volume",
},
{
.name = GLUSTER_OPT_DEBUG,
.type = QEMU_OPT_NUMBER,
.help = "Gluster log level, valid range is 0-9",
},
{ /* end of list */ }
},
};
static QemuOptsList runtime_type_opts = {
.name = "gluster_type",
.head = QTAILQ_HEAD_INITIALIZER(runtime_type_opts.head),
.desc = {
{
.name = GLUSTER_OPT_TYPE,
.type = QEMU_OPT_STRING,
.help = "inet|unix",
},
{ /* end of list */ }
},
};
static QemuOptsList runtime_unix_opts = {
.name = "gluster_unix",
.head = QTAILQ_HEAD_INITIALIZER(runtime_unix_opts.head),
.desc = {
{
.name = GLUSTER_OPT_SOCKET,
.type = QEMU_OPT_STRING,
.help = "socket file path (legacy)",
},
{
.name = GLUSTER_OPT_PATH,
.type = QEMU_OPT_STRING,
.help = "socket file path (QAPI)",
},
{ /* end of list */ }
},
};
static QemuOptsList runtime_inet_opts = {
.name = "gluster_inet",
.head = QTAILQ_HEAD_INITIALIZER(runtime_inet_opts.head),
.desc = {
{
.name = GLUSTER_OPT_TYPE,
.type = QEMU_OPT_STRING,
.help = "inet|unix",
},
{
.name = GLUSTER_OPT_HOST,
.type = QEMU_OPT_STRING,
.help = "host address (hostname/ipv4/ipv6 addresses)",
},
{
.name = GLUSTER_OPT_PORT,
.type = QEMU_OPT_STRING,
.help = "port number on which glusterd is listening (default 24007)",
},
{
.name = "to",
.type = QEMU_OPT_NUMBER,
.help = "max port number, not supported by gluster",
},
{
.name = "ipv4",
.type = QEMU_OPT_BOOL,
.help = "ipv4 bool value, not supported by gluster",
},
{
.name = "ipv6",
.type = QEMU_OPT_BOOL,
.help = "ipv6 bool value, not supported by gluster",
},
{ /* end of list */ }
},
};
static void glfs_set_preopened(const char *volume, glfs_t *fs)
{
ListElement *entry = NULL;
entry = g_new(ListElement, 1);
entry->saved.volume = g_strdup(volume);
entry->saved.fs = fs;
entry->saved.ref = 1;
QLIST_INSERT_HEAD(&glfs_list, entry, list);
}
static glfs_t *glfs_find_preopened(const char *volume)
{
ListElement *entry = NULL;
QLIST_FOREACH(entry, &glfs_list, list) {
if (strcmp(entry->saved.volume, volume) == 0) {
entry->saved.ref++;
return entry->saved.fs;
}
}
return NULL;
}
static void glfs_clear_preopened(glfs_t *fs)
{
ListElement *entry = NULL;
ListElement *next;
if (fs == NULL) {
return;
}
QLIST_FOREACH_SAFE(entry, &glfs_list, list, next) {
if (entry->saved.fs == fs) {
if (--entry->saved.ref) {
return;
}
QLIST_REMOVE(entry, list);
glfs_fini(entry->saved.fs);
g_free(entry->saved.volume);
g_free(entry);
}
}
}
static int parse_volume_options(BlockdevOptionsGluster *gconf, char *path)
{
char *p, *q;
if (!path) {
return -EINVAL;
}
/* volume */
p = q = path + strspn(path, "/");
p += strcspn(p, "/");
if (*p == '\0') {
return -EINVAL;
}
gconf->volume = g_strndup(q, p - q);
/* path */
p += strspn(p, "/");
if (*p == '\0') {
return -EINVAL;
}
gconf->path = g_strdup(p);
return 0;
}
/*
* file=gluster[+transport]://[host[:port]]/volume/path[?socket=...]
*
* 'gluster' is the protocol.
*
* 'transport' specifies the transport type used to connect to gluster
* management daemon (glusterd). Valid transport types are
* tcp or unix. If a transport type isn't specified, then tcp type is assumed.
*
* 'host' specifies the host where the volume file specification for
* the given volume resides. This can be either hostname or ipv4 address.
* If transport type is 'unix', then 'host' field should not be specified.
* The 'socket' field needs to be populated with the path to unix domain
* socket.
*
* 'port' is the port number on which glusterd is listening. This is optional
* and if not specified, QEMU will send 0 which will make gluster to use the
* default port. If the transport type is unix, then 'port' should not be
* specified.
*
* 'volume' is the name of the gluster volume which contains the VM image.
*
* 'path' is the path to the actual VM image that resides on gluster volume.
*
* Examples:
*
* file=gluster://1.2.3.4/testvol/a.img
* file=gluster+tcp://1.2.3.4/testvol/a.img
* file=gluster+tcp://1.2.3.4:24007/testvol/dir/a.img
* file=gluster+tcp://host.domain.com:24007/testvol/dir/a.img
* file=gluster+unix:///testvol/dir/a.img?socket=/tmp/glusterd.socket
*/
static int qemu_gluster_parse_uri(BlockdevOptionsGluster *gconf,
const char *filename)
{
SocketAddress *gsconf;
URI *uri;
QueryParams *qp = NULL;
bool is_unix = false;
int ret = 0;
uri = uri_parse(filename);
if (!uri) {
return -EINVAL;
}
gsconf = g_new0(SocketAddress, 1);
QAPI_LIST_PREPEND(gconf->server, gsconf);
/* transport */
if (!uri->scheme || !strcmp(uri->scheme, "gluster")) {
gsconf->type = SOCKET_ADDRESS_TYPE_INET;
} else if (!strcmp(uri->scheme, "gluster+tcp")) {
gsconf->type = SOCKET_ADDRESS_TYPE_INET;
} else if (!strcmp(uri->scheme, "gluster+unix")) {
gsconf->type = SOCKET_ADDRESS_TYPE_UNIX;
is_unix = true;
} else if (!strcmp(uri->scheme, "gluster+rdma")) {
gsconf->type = SOCKET_ADDRESS_TYPE_INET;
warn_report("rdma feature is not supported, falling back to tcp");
} else {
ret = -EINVAL;
goto out;
}
ret = parse_volume_options(gconf, uri->path);
if (ret < 0) {
goto out;
}
qp = query_params_parse(uri->query);
if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) {
ret = -EINVAL;
goto out;
}
if (is_unix) {
if (uri->server || uri->port) {
ret = -EINVAL;
goto out;
}
if (strcmp(qp->p[0].name, "socket")) {
ret = -EINVAL;
goto out;
}
gsconf->u.q_unix.path = g_strdup(qp->p[0].value);
} else {
gsconf->u.inet.host = g_strdup(uri->server ? uri->server : "localhost");
if (uri->port) {
gsconf->u.inet.port = g_strdup_printf("%d", uri->port);
} else {
gsconf->u.inet.port = g_strdup_printf("%d", GLUSTER_DEFAULT_PORT);
}
}
out:
if (qp) {
query_params_free(qp);
}
uri_free(uri);
return ret;
}
static struct glfs *qemu_gluster_glfs_init(BlockdevOptionsGluster *gconf,
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);
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