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gluster.c
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/*
* GlusterFS backend for QEMU
*
* Copyright (C) 2012 Bharata B Rao <[email protected]>
*
* 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 <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/option.h"
#include "qemu/cutils.h"
#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 */
#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(glfs_list, 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, full)"
},
{
.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;
}
gconf->server = g_new0(SocketAddressList, 1);
gconf->server->value = gsconf = g_new0(SocketAddress, 1);
/* 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 *curr = NULL;
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);
qemu_opts_absorb_qdict(opts, options, &local_err);
if (local_err) {
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);
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);
qemu_opts_absorb_qdict(opts, backing_options, &local_err);
if (local_err) {
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);
qemu_opts_absorb_qdict(opts, backing_options, &local_err);
if (local_err) {
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);
qemu_opts_absorb_qdict(opts, backing_options, &local_err);
if (local_err) {
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);
}
if (gconf->server == NULL) {
gconf->server = g_new0(SocketAddressList, 1);
gconf->server->value = gsconf;
curr = gconf->server;
} else {
curr->next = g_new0(SocketAddressList, 1);
curr->next->value = gsconf;
curr = curr->next;
}
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, 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;
Error *local_err = NULL;
const char *filename, *logfile;
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
qemu_opts_absorb_qdict(opts, options, &local_err);
if (local_err) {
error_propagate(errp, local_err);
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);
if (!s->fd) {
ret = -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 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;
reop_s->glfs = qemu_gluster_init(gconf, state->bs->filename, NULL, 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,
int size,
BdrvRequestFlags flags)
{
int ret;
GlusterAIOCB acb;
BDRVGlusterState *s = bs->opaque;
acb.size = size;
acb.ret = 0;
acb.coroutine = qemu_coroutine_self();
acb.aio_context = bdrv_get_aio_context(bs);
ret = glfs_zerofill_async(s->fd, offset, size, 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;