Now that AIOPool no longer keeps a freelist, it isn't really a "pool" anymore. Rename it to AIOCBInfo and make it const since it no longer needs to be modified. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
625 lines
17 KiB
C
625 lines
17 KiB
C
/*
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* GlusterFS backend for QEMU
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*
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* Copyright (C) 2012 Bharata B Rao <bharata@linux.vnet.ibm.com>
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*
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* Pipe handling mechanism in AIO implementation is derived from
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* block/rbd.c. Hence,
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*
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* Copyright (C) 2010-2011 Christian Brunner <chb@muc.de>,
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* Josh Durgin <josh.durgin@dreamhost.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include <glusterfs/api/glfs.h>
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#include "block_int.h"
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#include "qemu_socket.h"
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#include "uri.h"
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typedef struct GlusterAIOCB {
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BlockDriverAIOCB common;
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int64_t size;
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int ret;
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bool *finished;
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QEMUBH *bh;
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} GlusterAIOCB;
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typedef struct BDRVGlusterState {
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struct glfs *glfs;
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int fds[2];
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struct glfs_fd *fd;
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int qemu_aio_count;
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int event_reader_pos;
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GlusterAIOCB *event_acb;
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} BDRVGlusterState;
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#define GLUSTER_FD_READ 0
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#define GLUSTER_FD_WRITE 1
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typedef struct GlusterConf {
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char *server;
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int port;
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char *volname;
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char *image;
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char *transport;
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} GlusterConf;
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static void qemu_gluster_gconf_free(GlusterConf *gconf)
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{
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g_free(gconf->server);
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g_free(gconf->volname);
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g_free(gconf->image);
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g_free(gconf->transport);
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g_free(gconf);
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}
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static int parse_volume_options(GlusterConf *gconf, char *path)
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{
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char *p, *q;
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if (!path) {
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return -EINVAL;
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}
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/* volume */
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p = q = path + strspn(path, "/");
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p += strcspn(p, "/");
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if (*p == '\0') {
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return -EINVAL;
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}
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gconf->volname = g_strndup(q, p - q);
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/* image */
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p += strspn(p, "/");
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if (*p == '\0') {
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return -EINVAL;
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}
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gconf->image = g_strdup(p);
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return 0;
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}
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/*
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* file=gluster[+transport]://[server[:port]]/volname/image[?socket=...]
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*
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* 'gluster' is the protocol.
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*
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* 'transport' specifies the transport type used to connect to gluster
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* management daemon (glusterd). Valid transport types are
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* tcp, unix and rdma. If a transport type isn't specified, then tcp
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* type is assumed.
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*
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* 'server' specifies the server where the volume file specification for
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* the given volume resides. This can be either hostname, ipv4 address
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* or ipv6 address. ipv6 address needs to be within square brackets [ ].
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* If transport type is 'unix', then 'server' field should not be specifed.
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* The 'socket' field needs to be populated with the path to unix domain
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* socket.
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*
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* 'port' is the port number on which glusterd is listening. This is optional
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* and if not specified, QEMU will send 0 which will make gluster to use the
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* default port. If the transport type is unix, then 'port' should not be
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* specified.
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*
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* 'volname' is the name of the gluster volume which contains the VM image.
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*
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* 'image' is the path to the actual VM image that resides on gluster volume.
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*
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* Examples:
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*
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* file=gluster://1.2.3.4/testvol/a.img
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* file=gluster+tcp://1.2.3.4/testvol/a.img
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* file=gluster+tcp://1.2.3.4:24007/testvol/dir/a.img
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* file=gluster+tcp://[1:2:3:4:5:6:7:8]/testvol/dir/a.img
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* file=gluster+tcp://[1:2:3:4:5:6:7:8]:24007/testvol/dir/a.img
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* file=gluster+tcp://server.domain.com:24007/testvol/dir/a.img
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* file=gluster+unix:///testvol/dir/a.img?socket=/tmp/glusterd.socket
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* file=gluster+rdma://1.2.3.4:24007/testvol/a.img
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*/
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static int qemu_gluster_parseuri(GlusterConf *gconf, const char *filename)
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{
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URI *uri;
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QueryParams *qp = NULL;
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bool is_unix = false;
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int ret = 0;
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uri = uri_parse(filename);
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if (!uri) {
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return -EINVAL;
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}
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/* transport */
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if (!strcmp(uri->scheme, "gluster")) {
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gconf->transport = g_strdup("tcp");
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} else if (!strcmp(uri->scheme, "gluster+tcp")) {
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gconf->transport = g_strdup("tcp");
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} else if (!strcmp(uri->scheme, "gluster+unix")) {
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gconf->transport = g_strdup("unix");
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is_unix = true;
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} else if (!strcmp(uri->scheme, "gluster+rdma")) {
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gconf->transport = g_strdup("rdma");
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} else {
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ret = -EINVAL;
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goto out;
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}
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ret = parse_volume_options(gconf, uri->path);
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if (ret < 0) {
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goto out;
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}
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qp = query_params_parse(uri->query);
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if (qp->n > 1 || (is_unix && !qp->n) || (!is_unix && qp->n)) {
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ret = -EINVAL;
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goto out;
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}
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if (is_unix) {
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if (uri->server || uri->port) {
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ret = -EINVAL;
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goto out;
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}
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if (strcmp(qp->p[0].name, "socket")) {
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ret = -EINVAL;
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goto out;
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}
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gconf->server = g_strdup(qp->p[0].value);
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} else {
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gconf->server = g_strdup(uri->server);
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gconf->port = uri->port;
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}
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out:
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if (qp) {
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query_params_free(qp);
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}
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uri_free(uri);
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return ret;
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}
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static struct glfs *qemu_gluster_init(GlusterConf *gconf, const char *filename)
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{
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struct glfs *glfs = NULL;
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int ret;
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int old_errno;
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ret = qemu_gluster_parseuri(gconf, filename);
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if (ret < 0) {
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error_report("Usage: file=gluster[+transport]://[server[:port]]/"
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"volname/image[?socket=...]");
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errno = -ret;
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goto out;
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}
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glfs = glfs_new(gconf->volname);
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if (!glfs) {
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goto out;
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}
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ret = glfs_set_volfile_server(glfs, gconf->transport, gconf->server,
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gconf->port);
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if (ret < 0) {
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goto out;
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}
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/*
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* TODO: Use GF_LOG_ERROR instead of hard code value of 4 here when
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* GlusterFS makes GF_LOG_* macros available to libgfapi users.
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*/
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ret = glfs_set_logging(glfs, "-", 4);
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if (ret < 0) {
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goto out;
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}
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ret = glfs_init(glfs);
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if (ret) {
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error_report("Gluster connection failed for server=%s port=%d "
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"volume=%s image=%s transport=%s\n", gconf->server, gconf->port,
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gconf->volname, gconf->image, gconf->transport);
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goto out;
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}
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return glfs;
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out:
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if (glfs) {
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old_errno = errno;
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glfs_fini(glfs);
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errno = old_errno;
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}
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return NULL;
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}
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static void qemu_gluster_complete_aio(GlusterAIOCB *acb, BDRVGlusterState *s)
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{
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int ret;
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bool *finished = acb->finished;
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BlockDriverCompletionFunc *cb = acb->common.cb;
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void *opaque = acb->common.opaque;
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if (!acb->ret || acb->ret == acb->size) {
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ret = 0; /* Success */
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} else if (acb->ret < 0) {
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ret = acb->ret; /* Read/Write failed */
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} else {
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ret = -EIO; /* Partial read/write - fail it */
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}
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s->qemu_aio_count--;
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qemu_aio_release(acb);
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cb(opaque, ret);
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if (finished) {
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*finished = true;
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}
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}
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static void qemu_gluster_aio_event_reader(void *opaque)
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{
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BDRVGlusterState *s = opaque;
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ssize_t ret;
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do {
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char *p = (char *)&s->event_acb;
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ret = read(s->fds[GLUSTER_FD_READ], p + s->event_reader_pos,
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sizeof(s->event_acb) - s->event_reader_pos);
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if (ret > 0) {
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s->event_reader_pos += ret;
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if (s->event_reader_pos == sizeof(s->event_acb)) {
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s->event_reader_pos = 0;
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qemu_gluster_complete_aio(s->event_acb, s);
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}
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}
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} while (ret < 0 && errno == EINTR);
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}
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static int qemu_gluster_aio_flush_cb(void *opaque)
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{
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BDRVGlusterState *s = opaque;
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return (s->qemu_aio_count > 0);
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}
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static int qemu_gluster_open(BlockDriverState *bs, const char *filename,
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int bdrv_flags)
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{
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BDRVGlusterState *s = bs->opaque;
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int open_flags = O_BINARY;
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int ret = 0;
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GlusterConf *gconf = g_malloc0(sizeof(GlusterConf));
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s->glfs = qemu_gluster_init(gconf, filename);
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if (!s->glfs) {
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ret = -errno;
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goto out;
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}
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if (bdrv_flags & BDRV_O_RDWR) {
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open_flags |= O_RDWR;
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} else {
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open_flags |= O_RDONLY;
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}
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if ((bdrv_flags & BDRV_O_NOCACHE)) {
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open_flags |= O_DIRECT;
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}
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s->fd = glfs_open(s->glfs, gconf->image, open_flags);
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if (!s->fd) {
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ret = -errno;
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goto out;
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}
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ret = qemu_pipe(s->fds);
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if (ret < 0) {
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ret = -errno;
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goto out;
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}
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fcntl(s->fds[GLUSTER_FD_READ], F_SETFL, O_NONBLOCK);
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qemu_aio_set_fd_handler(s->fds[GLUSTER_FD_READ],
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qemu_gluster_aio_event_reader, NULL, qemu_gluster_aio_flush_cb, s);
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out:
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qemu_gluster_gconf_free(gconf);
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if (!ret) {
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return ret;
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}
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if (s->fd) {
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glfs_close(s->fd);
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}
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if (s->glfs) {
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glfs_fini(s->glfs);
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}
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return ret;
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}
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static int qemu_gluster_create(const char *filename,
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QEMUOptionParameter *options)
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{
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struct glfs *glfs;
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struct glfs_fd *fd;
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int ret = 0;
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int64_t total_size = 0;
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GlusterConf *gconf = g_malloc0(sizeof(GlusterConf));
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glfs = qemu_gluster_init(gconf, filename);
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if (!glfs) {
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ret = -errno;
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goto out;
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}
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while (options && options->name) {
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if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
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total_size = options->value.n / BDRV_SECTOR_SIZE;
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}
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options++;
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}
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fd = glfs_creat(glfs, gconf->image,
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O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR | S_IWUSR);
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if (!fd) {
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ret = -errno;
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} else {
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if (glfs_ftruncate(fd, total_size * BDRV_SECTOR_SIZE) != 0) {
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ret = -errno;
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}
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if (glfs_close(fd) != 0) {
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ret = -errno;
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}
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}
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out:
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qemu_gluster_gconf_free(gconf);
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if (glfs) {
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glfs_fini(glfs);
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}
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return ret;
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}
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static void qemu_gluster_aio_cancel(BlockDriverAIOCB *blockacb)
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{
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GlusterAIOCB *acb = (GlusterAIOCB *)blockacb;
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bool finished = false;
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acb->finished = &finished;
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while (!finished) {
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qemu_aio_wait();
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}
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}
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static const AIOCBInfo gluster_aiocb_info = {
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.aiocb_size = sizeof(GlusterAIOCB),
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.cancel = qemu_gluster_aio_cancel,
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};
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static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret, void *arg)
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{
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GlusterAIOCB *acb = (GlusterAIOCB *)arg;
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BlockDriverState *bs = acb->common.bs;
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BDRVGlusterState *s = bs->opaque;
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int retval;
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acb->ret = ret;
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retval = qemu_write_full(s->fds[GLUSTER_FD_WRITE], &acb, sizeof(acb));
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if (retval != sizeof(acb)) {
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/*
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* Gluster AIO callback thread failed to notify the waiting
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* QEMU thread about IO completion.
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*
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* Complete this IO request and make the disk inaccessible for
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* subsequent reads and writes.
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*/
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error_report("Gluster failed to notify QEMU about IO completion");
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qemu_mutex_lock_iothread(); /* We are in gluster thread context */
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acb->common.cb(acb->common.opaque, -EIO);
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qemu_aio_release(acb);
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s->qemu_aio_count--;
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close(s->fds[GLUSTER_FD_READ]);
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close(s->fds[GLUSTER_FD_WRITE]);
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qemu_aio_set_fd_handler(s->fds[GLUSTER_FD_READ], NULL, NULL, NULL,
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NULL);
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bs->drv = NULL; /* Make the disk inaccessible */
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qemu_mutex_unlock_iothread();
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}
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}
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static BlockDriverAIOCB *qemu_gluster_aio_rw(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque, int write)
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{
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int ret;
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GlusterAIOCB *acb;
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BDRVGlusterState *s = bs->opaque;
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size_t size;
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off_t offset;
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offset = sector_num * BDRV_SECTOR_SIZE;
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size = nb_sectors * BDRV_SECTOR_SIZE;
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s->qemu_aio_count++;
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acb = qemu_aio_get(&gluster_aiocb_info, bs, cb, opaque);
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acb->size = size;
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acb->ret = 0;
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acb->finished = NULL;
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if (write) {
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ret = glfs_pwritev_async(s->fd, qiov->iov, qiov->niov, offset, 0,
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&gluster_finish_aiocb, acb);
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} else {
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ret = glfs_preadv_async(s->fd, qiov->iov, qiov->niov, offset, 0,
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&gluster_finish_aiocb, acb);
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}
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if (ret < 0) {
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goto out;
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}
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return &acb->common;
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out:
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s->qemu_aio_count--;
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qemu_aio_release(acb);
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return NULL;
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}
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static BlockDriverAIOCB *qemu_gluster_aio_readv(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque)
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{
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return qemu_gluster_aio_rw(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
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}
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static BlockDriverAIOCB *qemu_gluster_aio_writev(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque)
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{
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return qemu_gluster_aio_rw(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
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}
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static BlockDriverAIOCB *qemu_gluster_aio_flush(BlockDriverState *bs,
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BlockDriverCompletionFunc *cb, void *opaque)
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{
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int ret;
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GlusterAIOCB *acb;
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BDRVGlusterState *s = bs->opaque;
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acb = qemu_aio_get(&gluster_aiocb_info, bs, cb, opaque);
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acb->size = 0;
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acb->ret = 0;
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acb->finished = NULL;
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s->qemu_aio_count++;
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ret = glfs_fsync_async(s->fd, &gluster_finish_aiocb, acb);
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if (ret < 0) {
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goto out;
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}
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return &acb->common;
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out:
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s->qemu_aio_count--;
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qemu_aio_release(acb);
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return NULL;
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}
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static int64_t qemu_gluster_getlength(BlockDriverState *bs)
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{
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BDRVGlusterState *s = bs->opaque;
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int64_t ret;
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|
|
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 void qemu_gluster_close(BlockDriverState *bs)
|
|
{
|
|
BDRVGlusterState *s = bs->opaque;
|
|
|
|
close(s->fds[GLUSTER_FD_READ]);
|
|
close(s->fds[GLUSTER_FD_WRITE]);
|
|
qemu_aio_set_fd_handler(s->fds[GLUSTER_FD_READ], NULL, NULL, NULL, NULL);
|
|
|
|
if (s->fd) {
|
|
glfs_close(s->fd);
|
|
s->fd = NULL;
|
|
}
|
|
glfs_fini(s->glfs);
|
|
}
|
|
|
|
static QEMUOptionParameter qemu_gluster_create_options[] = {
|
|
{
|
|
.name = BLOCK_OPT_SIZE,
|
|
.type = OPT_SIZE,
|
|
.help = "Virtual disk size"
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static BlockDriver bdrv_gluster = {
|
|
.format_name = "gluster",
|
|
.protocol_name = "gluster",
|
|
.instance_size = sizeof(BDRVGlusterState),
|
|
.bdrv_file_open = qemu_gluster_open,
|
|
.bdrv_close = qemu_gluster_close,
|
|
.bdrv_create = qemu_gluster_create,
|
|
.bdrv_getlength = qemu_gluster_getlength,
|
|
.bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
|
|
.bdrv_aio_readv = qemu_gluster_aio_readv,
|
|
.bdrv_aio_writev = qemu_gluster_aio_writev,
|
|
.bdrv_aio_flush = qemu_gluster_aio_flush,
|
|
.create_options = qemu_gluster_create_options,
|
|
};
|
|
|
|
static BlockDriver bdrv_gluster_tcp = {
|
|
.format_name = "gluster",
|
|
.protocol_name = "gluster+tcp",
|
|
.instance_size = sizeof(BDRVGlusterState),
|
|
.bdrv_file_open = qemu_gluster_open,
|
|
.bdrv_close = qemu_gluster_close,
|
|
.bdrv_create = qemu_gluster_create,
|
|
.bdrv_getlength = qemu_gluster_getlength,
|
|
.bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
|
|
.bdrv_aio_readv = qemu_gluster_aio_readv,
|
|
.bdrv_aio_writev = qemu_gluster_aio_writev,
|
|
.bdrv_aio_flush = qemu_gluster_aio_flush,
|
|
.create_options = qemu_gluster_create_options,
|
|
};
|
|
|
|
static BlockDriver bdrv_gluster_unix = {
|
|
.format_name = "gluster",
|
|
.protocol_name = "gluster+unix",
|
|
.instance_size = sizeof(BDRVGlusterState),
|
|
.bdrv_file_open = qemu_gluster_open,
|
|
.bdrv_close = qemu_gluster_close,
|
|
.bdrv_create = qemu_gluster_create,
|
|
.bdrv_getlength = qemu_gluster_getlength,
|
|
.bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
|
|
.bdrv_aio_readv = qemu_gluster_aio_readv,
|
|
.bdrv_aio_writev = qemu_gluster_aio_writev,
|
|
.bdrv_aio_flush = qemu_gluster_aio_flush,
|
|
.create_options = qemu_gluster_create_options,
|
|
};
|
|
|
|
static BlockDriver bdrv_gluster_rdma = {
|
|
.format_name = "gluster",
|
|
.protocol_name = "gluster+rdma",
|
|
.instance_size = sizeof(BDRVGlusterState),
|
|
.bdrv_file_open = qemu_gluster_open,
|
|
.bdrv_close = qemu_gluster_close,
|
|
.bdrv_create = qemu_gluster_create,
|
|
.bdrv_getlength = qemu_gluster_getlength,
|
|
.bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
|
|
.bdrv_aio_readv = qemu_gluster_aio_readv,
|
|
.bdrv_aio_writev = qemu_gluster_aio_writev,
|
|
.bdrv_aio_flush = qemu_gluster_aio_flush,
|
|
.create_options = qemu_gluster_create_options,
|
|
};
|
|
|
|
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);
|