| /* |
| * 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; |
| } |
| |
| 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, |
| #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; |
| 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); |
| 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; |
| } |
| |
| 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, |
| 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; |
| |
| 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(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, |
| PreallocMode prealloc, |
| 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) |
| { |
| assert(!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, int size) |
| { |
| 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_discard_async(s->fd, offset, size, 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; |
| } |
| } |
| |
| static int qemu_gluster_has_zero_init(BlockDriverState *bs) |
| { |
| /* GlusterFS volume could be backed by a block device */ |
| return 0; |
| } |
| |
| /* |
| * 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 the max value 'pnum' should be set to. |
| * |
| * (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; |
| |
| 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 = MIN(bytes, hole - offset); |
| ret = BDRV_BLOCK_DATA; |
| } else { |
| /* On a hole, compute bytes to the beginning of the next extent. */ |
| assert(hole == offset); |
| *pnum = MIN(bytes, 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_needs_filename = false, |
| .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, |
| .bdrv_has_zero_init = qemu_gluster_has_zero_init, |
| #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_needs_filename = false, |
| .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, |
| .bdrv_has_zero_init = qemu_gluster_has_zero_init, |
| #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_needs_filename = true, |
| .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, |
| .bdrv_has_zero_init = qemu_gluster_has_zero_init, |
| #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_needs_filename = true, |
| .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, |
| .bdrv_has_zero_init = qemu_gluster_has_zero_init, |
| #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); |