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path: root/src/tools/rbd_ggate/ggate_drv.c
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Diffstat (limited to 'src/tools/rbd_ggate/ggate_drv.c')
-rw-r--r--src/tools/rbd_ggate/ggate_drv.c379
1 files changed, 379 insertions, 0 deletions
diff --git a/src/tools/rbd_ggate/ggate_drv.c b/src/tools/rbd_ggate/ggate_drv.c
new file mode 100644
index 00000000..b1faccd2
--- /dev/null
+++ b/src/tools/rbd_ggate/ggate_drv.c
@@ -0,0 +1,379 @@
+// -*- mode:C; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include <sys/param.h>
+#include <sys/bio.h>
+#include <sys/disk.h>
+#include <sys/linker.h>
+#include <sys/queue.h>
+#include <sys/stat.h>
+
+#include <geom/gate/g_gate.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <libgeom.h>
+
+#include "debug.h"
+#include "ggate_drv.h"
+
+uint64_t ggate_drv_req_id(ggate_drv_req_t req) {
+ struct g_gate_ctl_io *ggio = (struct g_gate_ctl_io *)req;
+
+ return ggio->gctl_seq;
+}
+
+int ggate_drv_req_cmd(ggate_drv_req_t req) {
+ struct g_gate_ctl_io *ggio = (struct g_gate_ctl_io *)req;
+
+ switch (ggio->gctl_cmd) {
+ case BIO_WRITE:
+ return GGATE_DRV_CMD_WRITE;
+ case BIO_READ:
+ return GGATE_DRV_CMD_READ;
+ case BIO_FLUSH:
+ return GGATE_DRV_CMD_FLUSH;
+ case BIO_DELETE:
+ return GGATE_DRV_CMD_DISCARD;
+ default:
+ return GGATE_DRV_CMD_UNKNOWN;
+ }
+}
+
+uint64_t ggate_drv_req_offset(ggate_drv_req_t req) {
+ struct g_gate_ctl_io *ggio = (struct g_gate_ctl_io *)req;
+
+ return ggio->gctl_offset;
+}
+
+size_t ggate_drv_req_length(ggate_drv_req_t req) {
+ struct g_gate_ctl_io *ggio = (struct g_gate_ctl_io *)req;
+
+ return ggio->gctl_length;
+}
+
+void *ggate_drv_req_buf(ggate_drv_req_t req) {
+ struct g_gate_ctl_io *ggio = (struct g_gate_ctl_io *)req;
+
+ return ggio->gctl_data;
+}
+
+int ggate_drv_req_error(ggate_drv_req_t req) {
+ struct g_gate_ctl_io *ggio = (struct g_gate_ctl_io *)req;
+
+ return ggio->gctl_error;
+}
+
+void ggate_drv_req_set_error(ggate_drv_req_t req, int error) {
+ struct g_gate_ctl_io *ggio = (struct g_gate_ctl_io *)req;
+
+ ggio->gctl_error = error;
+}
+
+void *ggate_drv_req_release_buf(ggate_drv_req_t req) {
+ struct g_gate_ctl_io *ggio = (struct g_gate_ctl_io *)req;
+
+ void *data = ggio->gctl_data;
+ ggio->gctl_data = NULL;
+
+ return data;
+}
+
+struct ggate_drv {
+ int fd;
+ int unit;
+};
+
+int ggate_drv_load() {
+ if (modfind("g_gate") != -1) {
+ /* Present in kernel. */
+ return 0;
+ }
+
+ if (kldload("geom_gate") == -1 || modfind("g_gate") == -1) {
+ if (errno != EEXIST) {
+ err("failed to load geom_gate module");
+ return -errno;
+ }
+ }
+ return 0;
+}
+
+int ggate_drv_create(char *name, size_t namelen, size_t sectorsize,
+ size_t mediasize, bool readonly, const char *info, ggate_drv_t *drv_) {
+ struct ggate_drv *drv;
+ struct g_gate_ctl_create ggiocreate;
+
+ debug(20, "%s: name=%s, sectorsize=%zd, mediasize=%zd, readonly=%d, info=%s",
+ __func__, name, sectorsize, mediasize, (int)readonly, info);
+
+ if (*name != '\0') {
+ if (namelen > sizeof(ggiocreate.gctl_name) - 1) {
+ return -ENAMETOOLONG;
+ }
+ }
+
+ /*
+ * We communicate with ggate via /dev/ggctl. Open it.
+ */
+ int fd = open("/dev/" G_GATE_CTL_NAME, O_RDWR);
+ if (fd == -1) {
+ err("failed to open /dev/" G_GATE_CTL_NAME);
+ return -errno;
+ }
+
+ drv = calloc(1, sizeof(*drv));
+ if (drv == NULL) {
+ errno = -ENOMEM;
+ goto fail_close;
+ }
+
+ /*
+ * Create provider.
+ */
+ memset(&ggiocreate, 0, sizeof(ggiocreate));
+ ggiocreate.gctl_version = G_GATE_VERSION;
+ ggiocreate.gctl_mediasize = mediasize;
+ ggiocreate.gctl_sectorsize = sectorsize;
+ ggiocreate.gctl_flags = readonly ? G_GATE_FLAG_READONLY : 0;
+ ggiocreate.gctl_maxcount = 0;
+ ggiocreate.gctl_timeout = 0;
+ if (*name != '\0') {
+ ggiocreate.gctl_unit = G_GATE_NAME_GIVEN;
+ strlcpy(ggiocreate.gctl_name, name, sizeof(ggiocreate.gctl_name));
+ } else {
+ ggiocreate.gctl_unit = G_GATE_UNIT_AUTO;
+ }
+ strlcpy(ggiocreate.gctl_info, info, sizeof(ggiocreate.gctl_info));
+ if (ioctl(fd, G_GATE_CMD_CREATE, &ggiocreate) == -1) {
+ err("failed to create " G_GATE_PROVIDER_NAME " device");
+ goto fail;
+ }
+
+ debug(20, "%s: created, unit: %d, name: %s", __func__, ggiocreate.gctl_unit,
+ ggiocreate.gctl_name);
+
+ drv->fd = fd;
+ drv->unit = ggiocreate.gctl_unit;
+ *drv_ = drv;
+
+ if (*name == '\0') {
+ snprintf(name, namelen, "%s%d", G_GATE_PROVIDER_NAME, drv->unit);
+ }
+
+ return 0;
+
+fail:
+ free(drv);
+fail_close:
+ close(fd);
+ return -errno;
+}
+
+void ggate_drv_destroy(ggate_drv_t drv_) {
+ struct ggate_drv *drv = (struct ggate_drv *)drv_;
+ struct g_gate_ctl_destroy ggiodestroy;
+
+ debug(20, "%s %p", __func__, drv);
+
+ memset(&ggiodestroy, 0, sizeof(ggiodestroy));
+ ggiodestroy.gctl_version = G_GATE_VERSION;
+ ggiodestroy.gctl_unit = drv->unit;
+ ggiodestroy.gctl_force = 1;
+
+ // Remember errno.
+ int rerrno = errno;
+
+ int r = ioctl(drv->fd, G_GATE_CMD_DESTROY, &ggiodestroy);
+ if (r == -1) {
+ err("failed to destroy /dev/%s%d device", G_GATE_PROVIDER_NAME,
+ drv->unit);
+ }
+ // Restore errno.
+ errno = rerrno;
+
+ free(drv);
+}
+
+int ggate_drv_resize(ggate_drv_t drv_, size_t newsize) {
+ struct ggate_drv *drv = (struct ggate_drv *)drv_;
+
+ debug(20, "%s %p: newsize=%zd", __func__, drv, newsize);
+
+ struct g_gate_ctl_modify ggiomodify;
+
+ memset(&ggiomodify, 0, sizeof(ggiomodify));
+ ggiomodify.gctl_version = G_GATE_VERSION;
+ ggiomodify.gctl_unit = drv->unit;
+ ggiomodify.gctl_modify = GG_MODIFY_MEDIASIZE;
+ ggiomodify.gctl_mediasize = newsize;
+
+ int r = ioctl(drv->fd, G_GATE_CMD_MODIFY, &ggiomodify);
+ if (r == -1) {
+ r = -errno;
+ err("failed to resize /dev/%s%d device", G_GATE_PROVIDER_NAME, drv->unit);
+ }
+ return r;
+}
+
+int ggate_drv_kill(const char *devname) {
+ debug(20, "%s %s", __func__, devname);
+
+ int fd = open("/dev/" G_GATE_CTL_NAME, O_RDWR);
+ if (fd == -1) {
+ err("failed to open /dev/" G_GATE_CTL_NAME);
+ return -errno;
+ }
+
+ struct g_gate_ctl_destroy ggiodestroy;
+ memset(&ggiodestroy, 0, sizeof(ggiodestroy));
+ ggiodestroy.gctl_version = G_GATE_VERSION;
+ ggiodestroy.gctl_unit = G_GATE_NAME_GIVEN;
+ ggiodestroy.gctl_force = 1;
+
+ strlcpy(ggiodestroy.gctl_name, devname, sizeof(ggiodestroy.gctl_name));
+
+ int r = ioctl(fd, G_GATE_CMD_DESTROY, &ggiodestroy);
+ if (r == -1) {
+ r = -errno;
+ err("failed to destroy %s device", devname);
+ }
+
+ close(fd);
+ return r;
+}
+
+int ggate_drv_recv(ggate_drv_t drv_, ggate_drv_req_t *req) {
+ struct ggate_drv *drv = (struct ggate_drv *)drv_;
+ struct g_gate_ctl_io *ggio;
+ int error, r;
+
+ debug(20, "%s", __func__);
+
+ ggio = calloc(1, sizeof(*ggio));
+ if (ggio == NULL) {
+ return -ENOMEM;
+ }
+
+ ggio->gctl_version = G_GATE_VERSION;
+ ggio->gctl_unit = drv->unit;
+ ggio->gctl_data = malloc(MAXPHYS);
+ ggio->gctl_length = MAXPHYS;
+
+ debug(20, "%s: waiting for request from kernel", __func__);
+ if (ioctl(drv->fd, G_GATE_CMD_START, ggio) == -1) {
+ err("%s: G_GATE_CMD_START failed", __func__);
+ return -errno;
+ }
+
+ debug(20, "%s: got request from kernel: "
+ "unit=%d, seq=%ju, cmd=%u, offset=%ju, length=%ju, error=%d, data=%p",
+ __func__, ggio->gctl_unit, (uintmax_t)ggio->gctl_seq, ggio->gctl_cmd,
+ (uintmax_t)ggio->gctl_offset, (uintmax_t)ggio->gctl_length,
+ ggio->gctl_error, ggio->gctl_data);
+
+ error = ggio->gctl_error;
+ switch (error) {
+ case 0:
+ break;
+ case ECANCELED:
+ debug(10, "%s: canceled: exit gracefully", __func__);
+ r = -error;
+ goto fail;
+ case ENOMEM:
+ /*
+ * Buffer too small? Impossible, we allocate MAXPHYS
+ * bytes - request can't be bigger than that.
+ */
+ /* FALLTHROUGH */
+ case ENXIO:
+ default:
+ errno = error;
+ err("%s: G_GATE_CMD_START failed", __func__);
+ r = -error;
+ goto fail;
+ }
+
+ *req = ggio;
+ return 0;
+
+fail:
+ free(ggio->gctl_data);
+ free(ggio);
+ return r;
+}
+
+int ggate_drv_send(ggate_drv_t drv_, ggate_drv_req_t req) {
+ struct ggate_drv *drv = (struct ggate_drv *)drv_;
+ struct g_gate_ctl_io *ggio = (struct g_gate_ctl_io *)req;
+ int r = 0;
+
+ debug(20, "%s: send request to kernel: "
+ "unit=%d, seq=%ju, cmd=%u, offset=%ju, length=%ju, error=%d, data=%p",
+ __func__, ggio->gctl_unit, (uintmax_t)ggio->gctl_seq, ggio->gctl_cmd,
+ (uintmax_t)ggio->gctl_offset, (uintmax_t)ggio->gctl_length,
+ ggio->gctl_error, ggio->gctl_data);
+
+ if (ioctl(drv->fd, G_GATE_CMD_DONE, ggio) == -1) {
+ err("%s: G_GATE_CMD_DONE failed", __func__);
+ r = -errno;
+ }
+
+ free(ggio->gctl_data);
+ free(ggio);
+ return r;
+}
+
+static const char * get_conf(struct ggeom *gp, const char *name) {
+ struct gconfig *conf;
+
+ LIST_FOREACH(conf, &gp->lg_config, lg_config) {
+ if (strcmp(conf->lg_name, name) == 0)
+ return (conf->lg_val);
+ }
+ return "";
+}
+
+int ggate_drv_list(struct ggate_drv_info *info, size_t *size) {
+ struct gmesh mesh;
+ struct gclass *class;
+ struct ggeom *gp;
+ int r;
+ size_t max_size;
+
+ r = geom_gettree(&mesh);
+ if (r != 0) {
+ return -errno;
+ }
+
+ max_size = *size;
+ *size = 0;
+
+ LIST_FOREACH(class, &mesh.lg_class, lg_class) {
+ if (strcmp(class->lg_name, G_GATE_CLASS_NAME) == 0) {
+ LIST_FOREACH(gp, &class->lg_geom, lg_geom) {
+ (*size)++;
+ }
+ if (*size > max_size) {
+ r = -ERANGE;
+ goto done;
+ }
+ LIST_FOREACH(gp, &class->lg_geom, lg_geom) {
+ strlcpy(info->id, get_conf(gp, "unit"), sizeof(info->id));
+ strlcpy(info->name, gp->lg_name, sizeof(info->name));
+ strlcpy(info->info, get_conf(gp, "info"), sizeof(info->info));
+ info++;
+ }
+ }
+ }
+
+done:
+ geom_deletetree(&mesh);
+ return r;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-14 02:40:41 +0000