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-rw-r--r--src/nvme/tree.c2713
1 files changed, 2713 insertions, 0 deletions
diff --git a/src/nvme/tree.c b/src/nvme/tree.c
new file mode 100644
index 0000000..344f8bc
--- /dev/null
+++ b/src/nvme/tree.c
@@ -0,0 +1,2713 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * This file is part of libnvme.
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ *
+ * Authors: Keith Busch <keith.busch@wdc.com>
+ * Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
+ */
+#include <dirent.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <unistd.h>
+#include <ifaddrs.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+
+#include <ccan/endian/endian.h>
+#include <ccan/list/list.h>
+
+#include "cleanup.h"
+#include "ioctl.h"
+#include "linux.h"
+#include "filters.h"
+#include "tree.h"
+#include "filters.h"
+#include "util.h"
+#include "fabrics.h"
+#include "log.h"
+#include "private.h"
+
+/**
+ * struct candidate_args - Used to look for a controller matching these parameters
+ * @transport: Transport type: loop, fc, rdma, tcp
+ * @traddr: Transport address (destination address)
+ * @trsvcid: Transport service ID
+ * @subsysnqn: Subsystem NQN
+ * @host_traddr: Host transport address (source address)
+ * @host_iface: Host interface for connection (tcp only)
+ * @iface_list: Interface list (tcp only)
+ * @addreq: Address comparison function (for traddr, host-traddr)
+ * @well_known_nqn: Set to "true" when @subsysnqn is the well-known NQN
+ */
+struct candidate_args {
+ const char *transport;
+ const char *traddr;
+ const char *trsvcid;
+ const char *subsysnqn;
+ const char *host_traddr;
+ const char *host_iface;
+ struct ifaddrs *iface_list;
+ bool (*addreq)(const char *, const char *);
+ bool well_known_nqn;
+};
+typedef bool (*ctrl_match_t)(struct nvme_ctrl *c, struct candidate_args *candidate);
+
+#define PATH_SYSFS_SLOTS "/sys/bus/pci/slots"
+
+static char *nvme_slots_sysfs_dir(void)
+{
+ char *basepath = getenv("LIBNVME_SYSFS_PATH");
+ char *str;
+
+ if (!basepath)
+ return strdup(PATH_SYSFS_SLOTS);
+
+ if (!asprintf(&str, "%s" PATH_SYSFS_SLOTS, basepath))
+ return NULL;
+
+ return str;
+}
+
+static struct nvme_host *default_host;
+
+static void __nvme_free_host(nvme_host_t h);
+static void __nvme_free_ctrl(nvme_ctrl_t c);
+static int nvme_subsystem_scan_namespace(nvme_root_t r,
+ struct nvme_subsystem *s, char *name,
+ nvme_scan_filter_t f, void *f_args);
+static int nvme_init_subsystem(nvme_subsystem_t s, const char *name);
+static int nvme_scan_subsystem(nvme_root_t r, const char *name,
+ nvme_scan_filter_t f, void *f_args);
+static int nvme_ctrl_scan_namespace(nvme_root_t r, struct nvme_ctrl *c,
+ char *name);
+static int nvme_ctrl_scan_path(nvme_root_t r, struct nvme_ctrl *c, char *name);
+
+/**
+ * Compare two C strings and handle NULL pointers gracefully.
+ * Return true if both pointers are equal (including both set to NULL).
+ * Return false if one and only one of the two pointers is NULL.
+ * Perform string comparisong only if both pointers are not NULL and
+ * return true if both strings are the same, false otherwise.
+ */
+static bool streq0(const char *s1, const char *s2)
+{
+ if (s1 == s2)
+ return true;
+ if (!s1 || !s2)
+ return false;
+ return !strcmp(s1, s2);
+}
+
+/**
+ * Same as streq0() but ignore the case of the characters.
+ */
+static bool streqcase0(const char *s1, const char *s2)
+{
+ if (s1 == s2)
+ return true;
+ if (!s1 || !s2)
+ return false;
+ return !strcasecmp(s1, s2);
+}
+
+struct dirents {
+ struct dirent **ents;
+ int num;
+};
+
+static void cleanup_dirents(struct dirents *ents)
+{
+ while (ents->num > 0)
+ free(ents->ents[--ents->num]);
+ free(ents->ents);
+}
+
+#define _cleanup_dirents_ __cleanup__(cleanup_dirents)
+
+nvme_host_t nvme_default_host(nvme_root_t r)
+{
+ struct nvme_host *h;
+ _cleanup_free_ char *hostnqn = NULL;
+ _cleanup_free_ char *hostid = NULL;
+
+ hostnqn = nvmf_hostnqn_from_file();
+ if (!hostnqn)
+ hostnqn = nvmf_hostnqn_generate();
+ hostid = nvmf_hostid_from_file();
+
+ h = nvme_lookup_host(r, hostnqn, hostid);
+
+ nvme_host_set_hostsymname(h, NULL);
+
+ default_host = h;
+ return h;
+}
+
+int nvme_scan_topology(struct nvme_root *r, nvme_scan_filter_t f, void *f_args)
+{
+ _cleanup_dirents_ struct dirents subsys = {}, ctrls = {};
+ int i, ret;
+
+ if (!r)
+ return 0;
+
+ ctrls.num = nvme_scan_ctrls(&ctrls.ents);
+ if (ctrls.num < 0) {
+ nvme_msg(r, LOG_DEBUG, "failed to scan ctrls: %s\n",
+ strerror(errno));
+ return ctrls.num;
+ }
+
+ for (i = 0; i < ctrls.num; i++) {
+ nvme_ctrl_t c = nvme_scan_ctrl(r, ctrls.ents[i]->d_name);
+ if (!c) {
+ nvme_msg(r, LOG_DEBUG, "failed to scan ctrl %s: %s\n",
+ ctrls.ents[i]->d_name, strerror(errno));
+ continue;
+ }
+ if ((f) && !f(NULL, c, NULL, f_args)) {
+ nvme_msg(r, LOG_DEBUG, "filter out controller %s\n",
+ ctrls.ents[i]->d_name);
+ nvme_free_ctrl(c);
+ }
+ }
+
+ subsys.num = nvme_scan_subsystems(&subsys.ents);
+ if (subsys.num < 0) {
+ nvme_msg(r, LOG_DEBUG, "failed to scan subsystems: %s\n",
+ strerror(errno));
+ return subsys.num;
+ }
+
+ for (i = 0; i < subsys.num; i++) {
+ ret = nvme_scan_subsystem(
+ r, subsys.ents[i]->d_name, f, f_args);
+ if (ret < 0) {
+ nvme_msg(r, LOG_DEBUG,
+ "failed to scan subsystem %s: %s\n",
+ subsys.ents[i]->d_name, strerror(errno));
+ }
+ }
+
+ return 0;
+}
+
+nvme_root_t nvme_create_root(FILE *fp, int log_level)
+{
+ struct nvme_root *r = calloc(1, sizeof(*r));
+
+ if (!r) {
+ errno = ENOMEM;
+ return NULL;
+ }
+ r->log_level = log_level;
+ r->fp = stderr;
+ if (fp)
+ r->fp = fp;
+ list_head_init(&r->hosts);
+ list_head_init(&r->endpoints);
+ nvme_set_root(r);
+ return r;
+}
+
+int nvme_read_config(nvme_root_t r, const char *config_file)
+{
+ int err = -1;
+
+ if (!r || !config_file) {
+ errno = ENODEV;
+ return err;
+ }
+
+ r->config_file = strdup(config_file);
+ if (!r->config_file) {
+ errno = ENOMEM;
+ return err;
+ }
+ err = json_read_config(r, config_file);
+ /*
+ * The json configuration file is optional,
+ * so ignore errors when opening the file.
+ */
+ if (err < 0 && errno != EPROTO)
+ err = 0;
+
+ return err;
+}
+
+nvme_root_t nvme_scan(const char *config_file)
+{
+ nvme_root_t r = nvme_create_root(NULL, DEFAULT_LOGLEVEL);
+
+ nvme_scan_topology(r, NULL, NULL);
+ nvme_read_config(r, config_file);
+ return r;
+}
+
+int nvme_update_config(nvme_root_t r)
+{
+ if (!r->modified || !r->config_file)
+ return 0;
+
+ return json_update_config(r, r->config_file);
+}
+
+int nvme_dump_config(nvme_root_t r)
+{
+ return json_update_config(r, NULL);
+}
+
+int nvme_dump_tree(nvme_root_t r)
+{
+ return json_dump_tree(r);
+}
+
+const char *nvme_root_get_application(nvme_root_t r)
+{
+ return r->application;
+}
+
+void nvme_root_set_application(nvme_root_t r, const char *a)
+{
+ if (r->application) {
+ free(r->application);
+ r->application = NULL;
+ }
+ if (a)
+ r->application = strdup(a);
+}
+
+nvme_host_t nvme_first_host(nvme_root_t r)
+{
+ return list_top(&r->hosts, struct nvme_host, entry);
+}
+
+nvme_host_t nvme_next_host(nvme_root_t r, nvme_host_t h)
+{
+ return h ? list_next(&r->hosts, h, entry) : NULL;
+}
+
+nvme_root_t nvme_host_get_root(nvme_host_t h)
+{
+ return h->r;
+}
+
+const char *nvme_host_get_hostnqn(nvme_host_t h)
+{
+ return h->hostnqn;
+}
+
+const char *nvme_host_get_hostid(nvme_host_t h)
+{
+ return h->hostid;
+}
+
+const char *nvme_host_get_hostsymname(nvme_host_t h)
+{
+ return h->hostsymname;
+}
+
+void nvme_host_set_hostsymname(nvme_host_t h, const char *hostsymname)
+{
+ if (h->hostsymname) {
+ free(h->hostsymname);
+ h->hostsymname = NULL;
+ }
+ if (hostsymname)
+ h->hostsymname = strdup(hostsymname);
+}
+
+const char *nvme_host_get_dhchap_key(nvme_host_t h)
+{
+ return h->dhchap_key;
+}
+
+void nvme_host_set_dhchap_key(nvme_host_t h, const char *key)
+{
+ if (h->dhchap_key) {
+ free(h->dhchap_key);
+ h->dhchap_key = NULL;
+ }
+ if (key)
+ h->dhchap_key = strdup(key);
+}
+
+void nvme_host_set_pdc_enabled(nvme_host_t h, bool enabled)
+{
+ h->pdc_enabled_valid = true;
+ h->pdc_enabled = enabled;
+}
+
+bool nvme_host_is_pdc_enabled(nvme_host_t h, bool fallback)
+{
+ if (h->pdc_enabled_valid)
+ return h->pdc_enabled;
+ return fallback;
+}
+
+nvme_subsystem_t nvme_first_subsystem(nvme_host_t h)
+{
+ return list_top(&h->subsystems, struct nvme_subsystem, entry);
+}
+
+nvme_subsystem_t nvme_next_subsystem(nvme_host_t h, nvme_subsystem_t s)
+{
+ return s ? list_next(&h->subsystems, s, entry) : NULL;
+}
+
+void nvme_refresh_topology(nvme_root_t r)
+{
+ struct nvme_host *h, *_h;
+
+ nvme_for_each_host_safe(r, h, _h)
+ __nvme_free_host(h);
+ nvme_scan_topology(r, NULL, NULL);
+}
+
+void nvme_free_tree(nvme_root_t r)
+{
+ struct nvme_host *h, *_h;
+
+ free(r->options);
+ nvme_for_each_host_safe(r, h, _h)
+ __nvme_free_host(h);
+ if (r->config_file)
+ free(r->config_file);
+ if (r->application)
+ free(r->application);
+ nvme_set_root(NULL);
+ free(r);
+}
+
+void nvme_root_release_fds(nvme_root_t r)
+{
+ struct nvme_host *h, *_h;
+
+ nvme_for_each_host_safe(r, h, _h)
+ nvme_host_release_fds(h);
+}
+
+const char *nvme_subsystem_get_nqn(nvme_subsystem_t s)
+{
+ return s->subsysnqn;
+}
+
+const char *nvme_subsystem_get_sysfs_dir(nvme_subsystem_t s)
+{
+ return s->sysfs_dir;
+}
+
+const char *nvme_subsystem_get_name(nvme_subsystem_t s)
+{
+ return s->name;
+}
+
+const char *nvme_subsystem_get_type(nvme_subsystem_t s)
+{
+ return s->subsystype;
+}
+
+const char *nvme_subsystem_get_application(nvme_subsystem_t s)
+{
+ return s->application;
+}
+
+void nvme_subsystem_set_application(nvme_subsystem_t s, const char *a)
+{
+ if (s->application) {
+ free(s->application);
+ s->application = NULL;
+ }
+ if (a)
+ s->application = strdup(a);
+}
+
+const char *nvme_subsystem_get_iopolicy(nvme_subsystem_t s)
+{
+ return s->iopolicy;
+}
+
+nvme_ctrl_t nvme_subsystem_first_ctrl(nvme_subsystem_t s)
+{
+ return list_top(&s->ctrls, struct nvme_ctrl, entry);
+}
+
+nvme_ctrl_t nvme_subsystem_next_ctrl(nvme_subsystem_t s, nvme_ctrl_t c)
+{
+ return c ? list_next(&s->ctrls, c, entry) : NULL;
+}
+
+nvme_host_t nvme_subsystem_get_host(nvme_subsystem_t s)
+{
+ return s->h;
+}
+
+nvme_ns_t nvme_subsystem_first_ns(nvme_subsystem_t s)
+{
+ return list_top(&s->namespaces, struct nvme_ns, entry);
+}
+
+nvme_ns_t nvme_subsystem_next_ns(nvme_subsystem_t s, nvme_ns_t n)
+{
+ return n ? list_next(&s->namespaces, n, entry) : NULL;
+}
+
+nvme_path_t nvme_namespace_first_path(nvme_ns_t ns)
+{
+ return list_top(&ns->paths, struct nvme_path, nentry);
+}
+
+nvme_path_t nvme_namespace_next_path(nvme_ns_t ns, nvme_path_t p)
+{
+ return p ? list_next(&ns->paths, p, nentry) : NULL;
+}
+
+static void __nvme_free_ns(struct nvme_ns *n)
+{
+ list_del_init(&n->entry);
+ nvme_ns_release_fd(n);
+ free(n->generic_name);
+ free(n->name);
+ free(n->sysfs_dir);
+ free(n);
+}
+
+/* Stub for SWIG */
+void nvme_free_ns(struct nvme_ns *n)
+{
+ __nvme_free_ns(n);
+}
+
+static void __nvme_free_subsystem(struct nvme_subsystem *s)
+{
+ struct nvme_ctrl *c, *_c;
+ struct nvme_ns *n, *_n;
+
+ list_del_init(&s->entry);
+ nvme_subsystem_for_each_ctrl_safe(s, c, _c)
+ __nvme_free_ctrl(c);
+
+ nvme_subsystem_for_each_ns_safe(s, n, _n)
+ __nvme_free_ns(n);
+
+ if (s->name)
+ free(s->name);
+ free(s->sysfs_dir);
+ free(s->subsysnqn);
+ if (s->model)
+ free(s->model);
+ if (s->serial)
+ free(s->serial);
+ if (s->firmware)
+ free(s->firmware);
+ if (s->subsystype)
+ free(s->subsystype);
+ if (s->application)
+ free(s->application);
+ if (s->iopolicy)
+ free(s->iopolicy);
+ free(s);
+}
+
+void nvme_subsystem_release_fds(struct nvme_subsystem *s)
+{
+ struct nvme_ctrl *c, *_c;
+ struct nvme_ns *n, *_n;
+
+ nvme_subsystem_for_each_ctrl_safe(s, c, _c)
+ nvme_ctrl_release_fd(c);
+
+ nvme_subsystem_for_each_ns_safe(s, n, _n)
+ nvme_ns_release_fd(n);
+}
+
+/*
+ * Stub for SWIG
+ */
+void nvme_free_subsystem(nvme_subsystem_t s)
+{
+}
+
+struct nvme_subsystem *nvme_alloc_subsystem(struct nvme_host *h,
+ const char *name,
+ const char *subsysnqn)
+{
+ struct nvme_subsystem *s;
+
+ s = calloc(1, sizeof(*s));
+ if (!s)
+ return NULL;
+
+ s->h = h;
+ s->subsysnqn = strdup(subsysnqn);
+ if (name)
+ nvme_init_subsystem(s, name);
+ list_head_init(&s->ctrls);
+ list_head_init(&s->namespaces);
+ list_node_init(&s->entry);
+ list_add(&h->subsystems, &s->entry);
+ h->r->modified = true;
+ return s;
+}
+
+struct nvme_subsystem *nvme_lookup_subsystem(struct nvme_host *h,
+ const char *name,
+ const char *subsysnqn)
+{
+ struct nvme_subsystem *s;
+
+ nvme_for_each_subsystem(h, s) {
+ if (subsysnqn && s->subsysnqn &&
+ strcmp(s->subsysnqn, subsysnqn))
+ continue;
+ if (name && s->name &&
+ strcmp(s->name, name))
+ continue;
+ if (h->r->application) {
+ if (!s->application)
+ continue;
+ if (strcmp(h->r->application, s->application))
+ continue;
+ }
+ return s;
+ }
+ return nvme_alloc_subsystem(h, name, subsysnqn);
+}
+
+static void __nvme_free_host(struct nvme_host *h)
+{
+ struct nvme_subsystem *s, *_s;
+
+ list_del_init(&h->entry);
+ nvme_for_each_subsystem_safe(h, s, _s)
+ __nvme_free_subsystem(s);
+ free(h->hostnqn);
+ if (h->hostid)
+ free(h->hostid);
+ if (h->dhchap_key)
+ free(h->dhchap_key);
+ nvme_host_set_hostsymname(h, NULL);
+ h->r->modified = true;
+ free(h);
+}
+
+void nvme_host_release_fds(struct nvme_host *h)
+{
+ struct nvme_subsystem *s, *_s;
+
+ nvme_for_each_subsystem_safe(h, s, _s)
+ nvme_subsystem_release_fds(s);
+}
+
+/* Stub for SWIG */
+void nvme_free_host(struct nvme_host *h)
+{
+ __nvme_free_host(h);
+}
+
+struct nvme_host *nvme_lookup_host(nvme_root_t r, const char *hostnqn,
+ const char *hostid)
+{
+ struct nvme_host *h;
+
+ if (!hostnqn)
+ return NULL;
+ nvme_for_each_host(r, h) {
+ if (strcmp(h->hostnqn, hostnqn))
+ continue;
+ if (hostid && (!h->hostid ||
+ strcmp(h->hostid, hostid)))
+ continue;
+ return h;
+ }
+ h = calloc(1,sizeof(*h));
+ if (!h)
+ return NULL;
+ h->hostnqn = strdup(hostnqn);
+ if (hostid)
+ h->hostid = strdup(hostid);
+ list_head_init(&h->subsystems);
+ list_node_init(&h->entry);
+ h->r = r;
+ list_add(&r->hosts, &h->entry);
+ r->modified = true;
+
+ return h;
+}
+
+static int nvme_subsystem_scan_namespaces(nvme_root_t r, nvme_subsystem_t s,
+ nvme_scan_filter_t f, void *f_args)
+{
+ _cleanup_dirents_ struct dirents namespaces = {};
+ int i, ret;
+
+ namespaces.num = nvme_scan_subsystem_namespaces(s, &namespaces.ents);
+ if (namespaces.num < 0) {
+ nvme_msg(r, LOG_DEBUG,
+ "failed to scan namespaces for subsys %s: %s\n",
+ s->subsysnqn, strerror(errno));
+ return namespaces.num;
+ }
+
+ for (i = 0; i < namespaces.num; i++) {
+ ret = nvme_subsystem_scan_namespace(r, s,
+ namespaces.ents[i]->d_name, f, f_args);
+ if (ret < 0)
+ nvme_msg(r, LOG_DEBUG,
+ "failed to scan namespace %s: %s\n",
+ namespaces.ents[i]->d_name, strerror(errno));
+ }
+
+ return 0;
+}
+
+static int nvme_init_subsystem(nvme_subsystem_t s, const char *name)
+{
+ _cleanup_free_ char *subsys_dir = nvme_subsys_sysfs_dir();
+ char *path;
+
+ if (asprintf(&path, "%s/%s", subsys_dir, name) < 0)
+ return -1;
+
+ s->model = nvme_get_attr(path, "model");
+ if (!s->model)
+ s->model = strdup("undefined");
+ s->serial = nvme_get_attr(path, "serial");
+ s->firmware = nvme_get_attr(path, "firmware_rev");
+ s->subsystype = nvme_get_attr(path, "subsystype");
+ if (!s->subsystype) {
+ if (!strcmp(s->subsysnqn, NVME_DISC_SUBSYS_NAME))
+ s->subsystype = strdup("discovery");
+ else
+ s->subsystype = strdup("nvm");
+ }
+ s->name = strdup(name);
+ s->sysfs_dir = (char *)path;
+ if (s->h->r->application)
+ s->application = strdup(s->h->r->application);
+ s->iopolicy = nvme_get_attr(path, "iopolicy");
+
+ return 0;
+}
+
+static bool __nvme_scan_subsystem(struct nvme_root *r, nvme_subsystem_t s,
+ nvme_scan_filter_t f, void *f_args)
+{
+ if (f && !f(s, NULL, NULL, f_args)) {
+ nvme_msg(r, LOG_DEBUG, "filter out subsystem %s\n", s->name);
+ __nvme_free_subsystem(s);
+ return false;
+ }
+ nvme_subsystem_scan_namespaces(r, s, f, f_args);
+ return true;
+}
+
+static int nvme_scan_subsystem(struct nvme_root *r, const char *name,
+ nvme_scan_filter_t f, void *f_args)
+{
+ struct nvme_subsystem *s = NULL, *_s;
+ _cleanup_free_ char *path = NULL, *subsysnqn = NULL;
+ _cleanup_free_ char *subsys_dir = nvme_subsys_sysfs_dir();
+ nvme_host_t h = NULL;
+ int ret;
+
+ nvme_msg(r, LOG_DEBUG, "scan subsystem %s\n", name);
+ ret = asprintf(&path, "%s/%s", subsys_dir, name);
+ if (ret < 0)
+ return ret;
+
+ subsysnqn = nvme_get_attr(path, "subsysnqn");
+ if (!subsysnqn) {
+ errno = ENODEV;
+ return -1;
+ }
+ nvme_for_each_host(r, h) {
+ nvme_for_each_subsystem(h, _s) {
+ /*
+ * We are always called after nvme_scan_ctrl(),
+ * so any subsystem we're interested at _must_
+ * have a name.
+ */
+ if (!_s->name)
+ continue;
+ if (strcmp(_s->name, name))
+ continue;
+ if (!__nvme_scan_subsystem(r, _s, f, f_args)) {
+ errno = EINVAL;
+ return -1;
+ }
+ s = _s;
+ }
+ }
+ if (!s) {
+ /*
+ * Subsystem with non-matching controller. odd.
+ * Create a subsystem with the default host
+ * and hope for the best.
+ */
+ nvme_msg(r, LOG_DEBUG, "creating detached subsystem '%s'\n",
+ name);
+ h = nvme_default_host(r);
+ s = nvme_alloc_subsystem(h, name, subsysnqn);
+ if (!s) {
+ errno = ENOMEM;
+ return -1;
+ }
+ if (!__nvme_scan_subsystem(r, s, f, f_args)) {
+ errno = EINVAL;
+ return -1;
+ }
+ } else if (strcmp(s->subsysnqn, subsysnqn)) {
+ nvme_msg(r, LOG_DEBUG, "NQN mismatch for subsystem '%s'\n",
+ name);
+ errno = EINVAL;
+ return -1;
+ }
+
+ return 0;
+}
+
+nvme_ctrl_t nvme_path_get_ctrl(nvme_path_t p)
+{
+ return p->c;
+}
+
+nvme_ns_t nvme_path_get_ns(nvme_path_t p)
+{
+ return p->n;
+}
+
+const char *nvme_path_get_sysfs_dir(nvme_path_t p)
+{
+ return p->sysfs_dir;
+}
+
+const char *nvme_path_get_name(nvme_path_t p)
+{
+ return p->name;
+}
+
+const char *nvme_path_get_ana_state(nvme_path_t p)
+{
+ return p->ana_state;
+}
+
+void nvme_free_path(struct nvme_path *p)
+{
+ list_del_init(&p->entry);
+ list_del_init(&p->nentry);
+ free(p->name);
+ free(p->sysfs_dir);
+ free(p->ana_state);
+ free(p);
+}
+
+static void nvme_subsystem_set_path_ns(nvme_subsystem_t s, nvme_path_t p)
+{
+ char n_name[32] = { };
+ int i, c, nsid, ret;
+ nvme_ns_t n;
+
+ ret = sscanf(nvme_path_get_name(p), "nvme%dc%dn%d", &i, &c, &nsid);
+ if (ret != 3)
+ return;
+
+ sprintf(n_name, "nvme%dn%d", i, nsid);
+ nvme_subsystem_for_each_ns(s, n) {
+ if (!strcmp(n_name, nvme_ns_get_name(n))) {
+ list_add(&n->paths, &p->nentry);
+ p->n = n;
+ }
+ }
+}
+
+static int nvme_ctrl_scan_path(nvme_root_t r, struct nvme_ctrl *c, char *name)
+{
+ struct nvme_path *p;
+ _cleanup_free_ char *path = NULL, *grpid = NULL;
+ int ret;
+
+ nvme_msg(r, LOG_DEBUG, "scan controller %s path %s\n",
+ c->name, name);
+ if (!c->s) {
+ errno = ENXIO;
+ return -1;
+ }
+ ret = asprintf(&path, "%s/%s", c->sysfs_dir, name);
+ if (ret < 0) {
+ errno = ENOMEM;
+ return -1;
+ }
+
+ p = calloc(1, sizeof(*p));
+ if (!p) {
+ errno = ENOMEM;
+ return -1;
+ }
+
+ p->c = c;
+ p->name = strdup(name);
+ p->sysfs_dir = path;
+ path = NULL;
+ p->ana_state = nvme_get_path_attr(p, "ana_state");
+ if (!p->ana_state)
+ p->ana_state = strdup("optimized");
+
+ grpid = nvme_get_path_attr(p, "ana_grpid");
+ if (grpid) {
+ sscanf(grpid, "%d", &p->grpid);
+ }
+
+ list_node_init(&p->nentry);
+ nvme_subsystem_set_path_ns(c->s, p);
+ list_node_init(&p->entry);
+ list_add(&c->paths, &p->entry);
+ return 0;
+}
+
+int nvme_ctrl_get_fd(nvme_ctrl_t c)
+{
+ if (c->fd < 0) {
+ c->fd = nvme_open(c->name);
+ if (c->fd < 0)
+ nvme_msg(root_from_ctrl(c), LOG_ERR,
+ "Failed to open ctrl %s, errno %d\n",
+ c->name, errno);
+ }
+ return c->fd;
+}
+
+void nvme_ctrl_release_fd(nvme_ctrl_t c)
+{
+ if (c->fd < 0)
+ return;
+
+ close(c->fd);
+ c->fd = -1;
+}
+
+nvme_subsystem_t nvme_ctrl_get_subsystem(nvme_ctrl_t c)
+{
+ return c->s;
+}
+
+const char *nvme_ctrl_get_name(nvme_ctrl_t c)
+{
+ return c->name;
+}
+
+const char *nvme_ctrl_get_sysfs_dir(nvme_ctrl_t c)
+{
+ return c->sysfs_dir;
+}
+
+const char *nvme_ctrl_get_subsysnqn(nvme_ctrl_t c)
+{
+ return c->s ? c->s->subsysnqn : c->subsysnqn;
+}
+
+const char *nvme_ctrl_get_address(nvme_ctrl_t c)
+{
+ return c->address ? c->address : "";
+}
+
+char *nvme_ctrl_get_src_addr(nvme_ctrl_t c, char *src_addr, size_t src_addr_len)
+{
+ size_t l;
+ char *p;
+
+ if (!c->address)
+ return NULL;
+
+ p = strstr(c->address, "src_addr=");
+ if (!p)
+ return NULL;
+
+ p += strlen("src_addr=");
+ l = strcspn(p, ",%"); /* % to eliminate IPv6 scope (if present) */
+ if (l >= src_addr_len) {
+ nvme_msg(root_from_ctrl(c), LOG_ERR,
+ "Buffer for src_addr is too small (%zu must be > %zu)\n",
+ src_addr_len, l);
+ return NULL;
+ }
+
+ strncpy(src_addr, p, l);
+ src_addr[l] = '\0';
+ return src_addr;
+}
+
+const char *nvme_ctrl_get_phy_slot(nvme_ctrl_t c)
+{
+ return c->phy_slot ? c->phy_slot : "";
+}
+
+const char *nvme_ctrl_get_firmware(nvme_ctrl_t c)
+{
+ return c->firmware;
+}
+
+const char *nvme_ctrl_get_model(nvme_ctrl_t c)
+{
+ return c->model;
+}
+
+const char *nvme_ctrl_get_state(nvme_ctrl_t c)
+{
+ char *state = c->state;
+
+ c->state = nvme_get_ctrl_attr(c, "state");
+ if (state)
+ free(state);
+ return c->state;
+}
+
+const char *nvme_ctrl_get_numa_node(nvme_ctrl_t c)
+{
+ return c->numa_node;
+}
+
+const char *nvme_ctrl_get_queue_count(nvme_ctrl_t c)
+{
+ return c->queue_count;
+}
+
+const char *nvme_ctrl_get_serial(nvme_ctrl_t c)
+{
+ return c->serial;
+}
+
+const char *nvme_ctrl_get_sqsize(nvme_ctrl_t c)
+{
+ return c->sqsize;
+}
+
+const char *nvme_ctrl_get_transport(nvme_ctrl_t c)
+{
+ return c->transport;
+}
+
+const char *nvme_ctrl_get_traddr(nvme_ctrl_t c)
+{
+ return c->traddr;
+}
+
+const char *nvme_ctrl_get_trsvcid(nvme_ctrl_t c)
+{
+ return c->trsvcid;
+}
+
+const char *nvme_ctrl_get_host_traddr(nvme_ctrl_t c)
+{
+ return c->cfg.host_traddr;
+}
+
+const char *nvme_ctrl_get_host_iface(nvme_ctrl_t c)
+{
+ return c->cfg.host_iface;
+}
+
+struct nvme_fabrics_config *nvme_ctrl_get_config(nvme_ctrl_t c)
+{
+ return &c->cfg;
+}
+
+const char *nvme_ctrl_get_dhchap_host_key(nvme_ctrl_t c)
+{
+ return c->dhchap_key;
+}
+
+void nvme_ctrl_set_dhchap_host_key(nvme_ctrl_t c, const char *key)
+{
+ if (c->dhchap_key) {
+ free(c->dhchap_key);
+ c->dhchap_key = NULL;
+ }
+ if (key)
+ c->dhchap_key = strdup(key);
+}
+
+const char *nvme_ctrl_get_dhchap_key(nvme_ctrl_t c)
+{
+ return c->dhchap_ctrl_key;
+}
+
+void nvme_ctrl_set_dhchap_key(nvme_ctrl_t c, const char *key)
+{
+ if (c->dhchap_ctrl_key) {
+ free(c->dhchap_ctrl_key);
+ c->dhchap_ctrl_key = NULL;
+ }
+ if (key)
+ c->dhchap_ctrl_key = strdup(key);
+}
+
+void nvme_ctrl_set_discovered(nvme_ctrl_t c, bool discovered)
+{
+ c->discovered = discovered;
+}
+
+bool nvme_ctrl_is_discovered(nvme_ctrl_t c)
+{
+ return c->discovered;
+}
+
+void nvme_ctrl_set_persistent(nvme_ctrl_t c, bool persistent)
+{
+ c->persistent = persistent;
+}
+
+bool nvme_ctrl_is_persistent(nvme_ctrl_t c)
+{
+ return c->persistent;
+}
+
+void nvme_ctrl_set_discovery_ctrl(nvme_ctrl_t c, bool discovery)
+{
+ c->discovery_ctrl = discovery;
+}
+
+bool nvme_ctrl_is_discovery_ctrl(nvme_ctrl_t c)
+{
+ return c->discovery_ctrl;
+}
+
+void nvme_ctrl_set_unique_discovery_ctrl(nvme_ctrl_t c, bool unique)
+{
+ c->unique_discovery_ctrl = unique;
+}
+
+bool nvme_ctrl_is_unique_discovery_ctrl(nvme_ctrl_t c)
+{
+ return c->unique_discovery_ctrl;
+}
+
+int nvme_ctrl_identify(nvme_ctrl_t c, struct nvme_id_ctrl *id)
+{
+ return nvme_identify_ctrl(nvme_ctrl_get_fd(c), id);
+}
+
+nvme_ns_t nvme_ctrl_first_ns(nvme_ctrl_t c)
+{
+ return list_top(&c->namespaces, struct nvme_ns, entry);
+}
+
+nvme_ns_t nvme_ctrl_next_ns(nvme_ctrl_t c, nvme_ns_t n)
+{
+ return n ? list_next(&c->namespaces, n, entry) : NULL;
+}
+
+nvme_path_t nvme_ctrl_first_path(nvme_ctrl_t c)
+{
+ return list_top(&c->paths, struct nvme_path, entry);
+}
+
+nvme_path_t nvme_ctrl_next_path(nvme_ctrl_t c, nvme_path_t p)
+{
+ return p ? list_next(&c->paths, p, entry) : NULL;
+}
+
+#define FREE_CTRL_ATTR(a) \
+ do { if (a) { free(a); (a) = NULL; } } while (0)
+void nvme_deconfigure_ctrl(nvme_ctrl_t c)
+{
+ nvme_ctrl_release_fd(c);
+ FREE_CTRL_ATTR(c->name);
+ FREE_CTRL_ATTR(c->sysfs_dir);
+ FREE_CTRL_ATTR(c->firmware);
+ FREE_CTRL_ATTR(c->model);
+ FREE_CTRL_ATTR(c->state);
+ FREE_CTRL_ATTR(c->numa_node);
+ FREE_CTRL_ATTR(c->queue_count);
+ FREE_CTRL_ATTR(c->serial);
+ FREE_CTRL_ATTR(c->sqsize);
+ FREE_CTRL_ATTR(c->dhchap_key);
+ FREE_CTRL_ATTR(c->dhchap_ctrl_key);
+ FREE_CTRL_ATTR(c->address);
+ FREE_CTRL_ATTR(c->dctype);
+ FREE_CTRL_ATTR(c->cntrltype);
+ FREE_CTRL_ATTR(c->phy_slot);
+}
+
+int nvme_disconnect_ctrl(nvme_ctrl_t c)
+{
+ nvme_root_t r = c->s && c->s->h ? c->s->h->r : NULL;
+ int ret;
+
+ ret = nvme_set_attr(nvme_ctrl_get_sysfs_dir(c),
+ "delete_controller", "1");
+ if (ret < 0) {
+ nvme_msg(r, LOG_ERR, "%s: failed to disconnect, error %d\n",
+ c->name, errno);
+ return ret;
+ }
+ nvme_msg(r, LOG_INFO, "%s: %s disconnected\n", c->name, c->subsysnqn);
+ nvme_deconfigure_ctrl(c);
+ return 0;
+}
+
+void nvme_unlink_ctrl(nvme_ctrl_t c)
+{
+ list_del_init(&c->entry);
+ c->s = NULL;
+}
+
+static void __nvme_free_ctrl(nvme_ctrl_t c)
+{
+ struct nvme_path *p, *_p;
+ struct nvme_ns *n, *_n;
+
+ nvme_unlink_ctrl(c);
+
+ nvme_ctrl_for_each_path_safe(c, p, _p)
+ nvme_free_path(p);
+
+ nvme_ctrl_for_each_ns_safe(c, n, _n)
+ __nvme_free_ns(n);
+
+ nvme_deconfigure_ctrl(c);
+
+ FREE_CTRL_ATTR(c->transport);
+ FREE_CTRL_ATTR(c->subsysnqn);
+ FREE_CTRL_ATTR(c->traddr);
+ FREE_CTRL_ATTR(c->cfg.host_traddr);
+ FREE_CTRL_ATTR(c->cfg.host_iface);
+ FREE_CTRL_ATTR(c->trsvcid);
+ free(c);
+}
+
+void nvme_free_ctrl(nvme_ctrl_t c)
+{
+ __nvme_free_ctrl(c);
+}
+
+static bool traddr_is_hostname(const char *transport, const char *traddr)
+{
+ char addrstr[NVMF_TRADDR_SIZE];
+
+ if (!traddr || !transport)
+ return false;
+ if (!strcmp(traddr, "none"))
+ return false;
+ if (strcmp(transport, "tcp") &&
+ strcmp(transport, "rdma"))
+ return false;
+ if (inet_pton(AF_INET, traddr, addrstr) > 0 ||
+ inet_pton(AF_INET6, traddr, addrstr) > 0)
+ return false;
+ return true;
+}
+
+struct nvme_ctrl *nvme_create_ctrl(nvme_root_t r,
+ const char *subsysnqn, const char *transport,
+ const char *traddr, const char *host_traddr,
+ const char *host_iface, const char *trsvcid)
+{
+ struct nvme_ctrl *c;
+
+ if (!transport) {
+ nvme_msg(r, LOG_ERR, "No transport specified\n");
+ errno = EINVAL;
+ return NULL;
+ }
+ if (strncmp(transport, "loop", 4) &&
+ strncmp(transport, "pcie", 4) && !traddr) {
+ nvme_msg(r, LOG_ERR, "No transport address for '%s'\n",
+ transport);
+ errno = EINVAL;
+ return NULL;
+ }
+ if (!subsysnqn) {
+ nvme_msg(r, LOG_ERR, "No subsystem NQN specified\n");
+ errno = EINVAL;
+ return NULL;
+ }
+ c = calloc(1, sizeof(*c));
+ if (!c) {
+ errno = ENOMEM;
+ return NULL;
+ }
+ c->fd = -1;
+ nvmf_default_config(&c->cfg);
+ list_head_init(&c->namespaces);
+ list_head_init(&c->paths);
+ list_node_init(&c->entry);
+ c->transport = strdup(transport);
+ c->subsysnqn = strdup(subsysnqn);
+ if (traddr)
+ c->traddr = strdup(traddr);
+ if (host_traddr) {
+ if (traddr_is_hostname(transport, host_traddr))
+ c->cfg.host_traddr = hostname2traddr(r, host_traddr);
+ if (!c->cfg.host_traddr)
+ c->cfg.host_traddr = strdup(host_traddr);
+ }
+ if (host_iface)
+ c->cfg.host_iface = strdup(host_iface);
+ if (trsvcid)
+ c->trsvcid = strdup(trsvcid);
+
+ return c;
+}
+
+/**
+ * _tcp_ctrl_match_host_traddr_no_src_addr() - Match host_traddr w/o src_addr
+ * @c: An existing controller instance
+ * @candidate: Candidate ctrl we're trying to match with @c.
+ *
+ * On kernels prior to 6.1 (i.e. src_addr is not available), try to match
+ * a candidate controller's host_traddr to that of an existing controller.
+ *
+ * This function takes an optimistic approach. In doubt, it will declare a
+ * match and return true.
+ *
+ * Return: true if @c->host_traddr matches @candidate->host_traddr. false otherwise.
+ */
+static bool _tcp_ctrl_match_host_traddr_no_src_addr(struct nvme_ctrl *c, struct candidate_args *candidate)
+{
+ if (c->cfg.host_traddr)
+ return candidate->addreq(candidate->host_traddr, c->cfg.host_traddr);
+
+ /* If c->cfg.host_traddr is NULL, then the controller (c)
+ * uses the interface's primary address as the source
+ * address. If c->cfg.host_iface is defined we can
+ * determine the primary address associated with that
+ * interface and compare that to the candidate->host_traddr.
+ */
+ if (c->cfg.host_iface)
+ return nvme_iface_primary_addr_matches(candidate->iface_list,
+ c->cfg.host_iface,
+ candidate->host_traddr);
+
+ /* If both c->cfg.host_traddr and c->cfg.host_iface are
+ * NULL, we don't have enough information to make a
+ * 100% positive match. Regardless, let's be optimistic
+ * and assume that we have a match.
+ */
+ nvme_msg(root_from_ctrl(c), LOG_DEBUG,
+ "Not enough data, but assume %s matches candidate's host_traddr: %s\n",
+ nvme_ctrl_get_name(c), candidate->host_traddr);
+
+ return true;
+}
+
+/**
+ * _tcp_ctrl_match_host_iface_no_src_addr() - Match host_iface w/o src_addr
+ * @c: An existing controller instance
+ * @candidate: Candidate ctrl we're trying to match with @c.
+ *
+ * On kernels prior to 6.1 (i.e. src_addr is not available), try to match
+ * a candidate controller's host_iface to that of an existing controller.
+ *
+ * This function takes an optimistic approach. In doubt, it will declare a
+ * match and return true.
+ *
+ * Return: true if @c->host_iface matches @candidate->host_iface. false otherwise.
+ */
+static bool _tcp_ctrl_match_host_iface_no_src_addr(struct nvme_ctrl *c, struct candidate_args *candidate)
+{
+ if (c->cfg.host_iface)
+ return streq0(candidate->host_iface, c->cfg.host_iface);
+
+ /* If c->cfg.host_traddr is not NULL we can infer the controller's (c)
+ * interface from it and compare it to the candidate->host_iface.
+ */
+ if (c->cfg.host_traddr) {
+ const char *c_host_iface;
+
+ c_host_iface = nvme_iface_matching_addr(candidate->iface_list, c->cfg.host_traddr);
+ return streq0(candidate->host_iface, c_host_iface);
+ }
+
+ /* If both c->cfg.host_traddr and c->cfg.host_iface are
+ * NULL, we don't have enough information to make a
+ * 100% positive match. Regardless, let's be optimistic
+ * and assume that we have a match.
+ */
+ nvme_msg(root_from_ctrl(c), LOG_DEBUG,
+ "Not enough data, but assume %s matches candidate's host_iface: %s\n",
+ nvme_ctrl_get_name(c), candidate->host_iface);
+
+ return true;
+}
+
+/**
+ * _tcp_opt_params_match_no_src_addr() - Match optional host_traddr/host_iface w/o src_addr
+ * @c: An existing controller instance
+ * @candidate: Candidate ctrl we're trying to match with @c.
+ *
+ * Before kernel 6.1, the src_addr was not reported by the kernel which makes
+ * it hard to match a candidate's host_traddr and host_iface to an existing
+ * controller if that controller was created without specifying the
+ * host_traddr and/or host_iface. This function tries its best in the absense
+ * of a src_addr to match @c to @candidate. This may not be 100% accurate.
+ * Only the src_addr can provide 100% accuracy.
+ *
+ * This function takes an optimistic approach. In doubt, it will declare a
+ * match and return true.
+ *
+ * Return: true if @c matches @candidate. false otherwise.
+ */
+static bool _tcp_opt_params_match_no_src_addr(struct nvme_ctrl *c, struct candidate_args *candidate)
+{
+ /* Check host_traddr only if candidate is interested */
+ if (candidate->host_traddr) {
+ if (!_tcp_ctrl_match_host_traddr_no_src_addr(c, candidate))
+ return false;
+ }
+
+ /* Check host_iface only if candidate is interested */
+ if (candidate->host_iface) {
+ if (!_tcp_ctrl_match_host_iface_no_src_addr(c, candidate))
+ return false;
+ }
+
+ return true;
+}
+
+/**
+ * _tcp_opt_params_match() - Match optional host_traddr/host_iface
+ * @c: An existing controller instance
+ * @candidate: Candidate ctrl we're trying to match with @c.
+ *
+ * The host_traddr and host_iface are optional for TCP. When they are not
+ * specified, the kernel looks up the destination IP address (traddr) in the
+ * routing table to determine the best interface for the connection. The
+ * kernel then retrieves the primary IP address assigned to that interface
+ * and uses that as the connection’s source address.
+ *
+ * An interface’s primary address is the default source address used for
+ * all connections made on that interface unless host-traddr is used to
+ * override the default. Kernel-selected interfaces and/or source addresses
+ * are hidden from user-space applications unless the kernel makes that
+ * information available through the "src_addr" attribute in the
+ * sysfs (kernel 6.1 or later).
+ *
+ * Sometimes, an application may force the interface by specifying the
+ * "host-iface" or may force a different source address (instead of the
+ * primary address) by providing the "host-traddr".
+ *
+ * If the candidate specifies the host_traddr and/or host_iface but they
+ * do not match the existing controller's host_traddr and/or host_iface
+ * (they could be NULL), we may still be able to find a match by taking
+ * the existing controller's src_addr into consideration since that
+ * parameter identifies the actual source address of the connection and
+ * therefore can be used to infer the interface of the connection. However,
+ * the src_addr can only be read from the nvme device's sysfs "address"
+ * attribute starting with kernel 6.1 (or kernels that backported the
+ * src_addr patch).
+ *
+ * For legacy kernels that do not provide the src_addr we must use a
+ * different algorithm to match the host_traddr and host_iface, but
+ * it's not 100% accurate.
+ *
+ * Return: true if @c matches @candidate. false otherwise.
+ */
+static bool _tcp_opt_params_match(struct nvme_ctrl *c, struct candidate_args *candidate)
+{
+ char *src_addr, buffer[INET6_ADDRSTRLEN];
+
+ /* Check if src_addr is available (kernel 6.1 or later) */
+ src_addr = nvme_ctrl_get_src_addr(c, buffer, sizeof(buffer));
+ if (!src_addr)
+ return _tcp_opt_params_match_no_src_addr(c, candidate);
+
+ /* Check host_traddr only if candidate is interested */
+ if (candidate->host_traddr &&
+ !candidate->addreq(candidate->host_traddr, src_addr))
+ return false;
+
+ /* Check host_iface only if candidate is interested */
+ if (candidate->host_iface &&
+ !streq0(candidate->host_iface,
+ nvme_iface_matching_addr(candidate->iface_list, src_addr)))
+ return false;
+
+ return true;
+}
+
+/**
+ * _tcp_match_ctrl() - Check if controller matches candidate (TCP only)
+ * @c: An existing controller instance
+ * @candidate: Candidate ctrl we're trying to match with @c.
+ *
+ * We want to determine if an existing controller can be re-used
+ * for the candidate controller we're trying to instantiate.
+ *
+ * For TCP, we do not have a match if the candidate's transport, traddr,
+ * trsvcid are not identical to those of the the existing controller.
+ * These 3 parameters are mandatory for a match.
+ *
+ * The host_traddr and host_iface are optional. When the candidate does
+ * not specify them (both NULL), we can ignore them. Otherwise, we must
+ * employ advanced investigation techniques to determine if there's a match.
+ *
+ * Return: true if a match is found, false otherwise.
+ */
+static bool _tcp_match_ctrl(struct nvme_ctrl *c, struct candidate_args *candidate)
+{
+ if (!streq0(c->transport, candidate->transport))
+ return false;
+
+ if (!streq0(c->trsvcid, candidate->trsvcid))
+ return false;
+
+ if (!candidate->addreq(c->traddr, candidate->traddr))
+ return false;
+
+ if (candidate->well_known_nqn && !nvme_ctrl_is_discovery_ctrl(c))
+ return false;
+
+ if (candidate->subsysnqn && !streq0(c->subsysnqn, candidate->subsysnqn))
+ return false;
+
+ /* Check host_traddr / host_iface only if candidate is interested */
+ if ((candidate->host_iface || candidate->host_traddr) &&
+ !_tcp_opt_params_match(c, candidate))
+ return false;
+
+ return true;
+}
+
+/**
+ * _match_ctrl() - Check if controller matches candidate (non TCP transport)
+ * @c: An existing controller instance
+ * @candidate: Candidate ctrl we're trying to match with @c.
+ *
+ * We want to determine if an existing controller can be re-used
+ * for the candidate controller we're trying to instantiate. This function
+ * is used for all transports except TCP.
+ *
+ * Return: true if a match is found, false otherwise.
+ */
+static bool _match_ctrl(struct nvme_ctrl *c, struct candidate_args *candidate)
+{
+ if (!streq0(c->transport, candidate->transport))
+ return false;
+
+ if (candidate->traddr && c->traddr &&
+ !candidate->addreq(c->traddr, candidate->traddr))
+ return false;
+
+ if (candidate->host_traddr && c->cfg.host_traddr &&
+ !candidate->addreq(c->cfg.host_traddr, candidate->host_traddr))
+ return false;
+
+ if (candidate->host_iface && c->cfg.host_iface &&
+ !streq0(c->cfg.host_iface, candidate->host_iface))
+ return false;
+
+ if (candidate->trsvcid && c->trsvcid &&
+ !streq0(c->trsvcid, candidate->trsvcid))
+ return false;
+
+ if (candidate->well_known_nqn && !nvme_ctrl_is_discovery_ctrl(c))
+ return false;
+
+ if (candidate->subsysnqn && !streq0(c->subsysnqn, candidate->subsysnqn))
+ return false;
+
+ return true;
+}
+/**
+ * _candidate_init() - Init candidate and get the matching function
+ *
+ * @candidate: Candidate struct to initialize
+ * @transport: Transport name
+ * @traddr: Transport address
+ * @trsvcid: Transport service identifier
+ * @subsysnqn: Subsystem NQN
+ * @host_traddr: Host transport address
+ * @host_iface: Host interface name
+ * @host_iface: Host interface name
+ *
+ * The function _candidate_free() must be called to release resources once
+ * the candidate object is not longer required.
+ *
+ * Return: The matching function to use when comparing an existing
+ * controller to the candidate controller.
+ */
+static ctrl_match_t _candidate_init(struct candidate_args *candidate,
+ const char *transport,
+ const char *traddr,
+ const char *trsvcid,
+ const char *subsysnqn,
+ const char *host_traddr,
+ const char *host_iface)
+{
+ memset(candidate, 0, sizeof(*candidate));
+
+ candidate->traddr = traddr;
+ candidate->trsvcid = trsvcid;
+ candidate->transport = transport;
+ candidate->subsysnqn = subsysnqn;
+ candidate->host_iface = host_iface;
+ candidate->host_traddr = host_traddr;
+
+ if (streq0(subsysnqn, NVME_DISC_SUBSYS_NAME)) {
+ /* Since TP8013, the NQN of discovery controllers can be the
+ * well-known NQN (i.e. nqn.2014-08.org.nvmexpress.discovery) or
+ * a unique NQN. A DC created using the well-known NQN may later
+ * display a unique NQN when looked up in the sysfs. Therefore,
+ * ignore (i.e. set to NULL) the well-known NQN when looking for
+ * a match.
+ */
+ candidate->subsysnqn = NULL;
+ candidate->well_known_nqn = true;
+ }
+
+ if (streq0(transport, "tcp")) {
+ /* For TCP we may need to access the interface map.
+ * Let's retrieve and cache the map.
+ */
+ if (getifaddrs(&candidate->iface_list) == -1)
+ candidate->iface_list = NULL;
+
+ candidate->addreq = nvme_ipaddrs_eq;
+ return _tcp_match_ctrl;
+ }
+
+ if (streq0(transport, "rdma")) {
+ candidate->addreq = nvme_ipaddrs_eq;
+ return _match_ctrl;
+ }
+
+ /* All other transport types */
+ candidate->addreq = streqcase0;
+ return _match_ctrl;
+}
+
+/**
+ * _candidate_free() - Release resources allocated by _candidate_init()
+ *
+ * @candidate: data to free.
+ */
+static void _candidate_free(struct candidate_args *candidate)
+{
+ freeifaddrs(candidate->iface_list); /* This is NULL-safe */
+}
+
+#define _cleanup_candidate_ __cleanup__(_candidate_free)
+
+nvme_ctrl_t __nvme_lookup_ctrl(nvme_subsystem_t s, const char *transport,
+ const char *traddr, const char *host_traddr,
+ const char *host_iface, const char *trsvcid,
+ const char *subsysnqn, nvme_ctrl_t p)
+{
+ struct nvme_ctrl *c, *matching_c = NULL;
+ _cleanup_candidate_ struct candidate_args candidate;
+ ctrl_match_t ctrl_match;
+
+ /* Init candidate and get the matching function to use */
+ ctrl_match = _candidate_init(&candidate, transport, traddr, trsvcid,
+ subsysnqn, host_traddr, host_iface);
+
+ c = p ? nvme_subsystem_next_ctrl(s, p) : nvme_subsystem_first_ctrl(s);
+ for (; c != NULL; c = nvme_subsystem_next_ctrl(s, c)) {
+ if (ctrl_match(c, &candidate)) {
+ matching_c = c;
+ break;
+ }
+ }
+
+ return matching_c;
+}
+
+bool nvme_ctrl_config_match(struct nvme_ctrl *c, const char *transport,
+ const char *traddr, const char *trsvcid,
+ const char *subsysnqn, const char *host_traddr,
+ const char *host_iface)
+{
+ ctrl_match_t ctrl_match;
+ _cleanup_candidate_ struct candidate_args candidate;
+
+ /* Init candidate and get the matching function to use */
+ ctrl_match = _candidate_init(&candidate, transport, traddr, trsvcid,
+ subsysnqn, host_traddr, host_iface);
+
+ return ctrl_match(c, &candidate);
+}
+
+nvme_ctrl_t nvme_ctrl_find(nvme_subsystem_t s, const char *transport,
+ const char *traddr, const char *trsvcid,
+ const char *subsysnqn, const char *host_traddr,
+ const char *host_iface)
+{
+ return __nvme_lookup_ctrl(s, transport, traddr, host_traddr, host_iface,
+ trsvcid, subsysnqn, NULL/*p*/);
+}
+
+nvme_ctrl_t nvme_lookup_ctrl(nvme_subsystem_t s, const char *transport,
+ const char *traddr, const char *host_traddr,
+ const char *host_iface, const char *trsvcid,
+ nvme_ctrl_t p)
+{
+ nvme_root_t r;
+ struct nvme_ctrl *c;
+
+ if (!s || !transport)
+ return NULL;
+
+ c = __nvme_lookup_ctrl(s, transport, traddr, host_traddr,
+ host_iface, trsvcid, NULL, p);
+ if (c)
+ return c;
+
+ r = s->h ? s->h->r : NULL;
+ c = nvme_create_ctrl(r, s->subsysnqn, transport, traddr,
+ host_traddr, host_iface, trsvcid);
+ if (c) {
+ c->s = s;
+ list_add(&s->ctrls, &c->entry);
+ s->h->r->modified = true;
+ }
+ return c;
+}
+
+static int nvme_ctrl_scan_paths(nvme_root_t r, struct nvme_ctrl *c)
+{
+ _cleanup_dirents_ struct dirents paths = {};
+ int i;
+
+ paths.num = nvme_scan_ctrl_namespace_paths(c, &paths.ents);
+ if (paths.num < 0)
+ return paths.num;
+
+ for (i = 0; i < paths.num; i++)
+ nvme_ctrl_scan_path(r, c, paths.ents[i]->d_name);
+
+ return 0;
+}
+
+static int nvme_ctrl_scan_namespaces(nvme_root_t r, struct nvme_ctrl *c)
+{
+ _cleanup_dirents_ struct dirents namespaces = {};
+ int i;
+
+ namespaces.num = nvme_scan_ctrl_namespaces(c, &namespaces.ents);
+ for (i = 0; i < namespaces.num; i++)
+ nvme_ctrl_scan_namespace(r, c, namespaces.ents[i]->d_name);
+
+ return 0;
+}
+
+static char *nvme_ctrl_lookup_subsystem_name(nvme_root_t r,
+ const char *ctrl_name)
+{
+ _cleanup_free_ char *subsys_dir = nvme_subsys_sysfs_dir();
+ _cleanup_dirents_ struct dirents subsys = {};
+ int i;
+
+ subsys.num = nvme_scan_subsystems(&subsys.ents);
+ if (subsys.num < 0)
+ return NULL;
+ for (i = 0; i < subsys.num; i++) {
+ struct stat st;
+ _cleanup_free_ char *path = NULL;
+
+ if (asprintf(&path, "%s/%s/%s", subsys_dir,
+ subsys.ents[i]->d_name, ctrl_name) < 0) {
+ errno = ENOMEM;
+ return NULL;
+ }
+ nvme_msg(r, LOG_DEBUG, "lookup subsystem %s\n", path);
+ if (stat(path, &st) < 0) {
+ continue;
+ }
+ return strdup(subsys.ents[i]->d_name);
+ }
+ return NULL;
+}
+
+static char *nvme_ctrl_lookup_phy_slot(nvme_root_t r, const char *address)
+{
+ _cleanup_free_ char *slots_sysfs_dir = nvme_slots_sysfs_dir();
+ _cleanup_free_ char *target_addr = NULL;
+ _cleanup_dir_ DIR *slots_dir = NULL;
+ int ret;
+ struct dirent *entry;
+
+ if (!address)
+ return NULL;
+
+ slots_dir = opendir(slots_sysfs_dir);
+ if (!slots_dir) {
+ nvme_msg(r, LOG_WARNING, "failed to open slots dir %s\n",
+ slots_sysfs_dir);
+ return NULL;
+ }
+
+ target_addr = strndup(address, 10);
+ while (!(entry = readdir(slots_dir))) {
+ if (entry->d_type == DT_DIR &&
+ strncmp(entry->d_name, ".", 1) != 0 &&
+ strncmp(entry->d_name, "..", 2) != 0) {
+ _cleanup_free_ char *path = NULL;
+ _cleanup_free_ char *addr = NULL;
+
+ ret = asprintf(&path, "%s/%s",
+ slots_sysfs_dir, entry->d_name);
+ if (ret < 0) {
+ errno = ENOMEM;
+ return NULL;
+ }
+ addr = nvme_get_attr(path, "address");
+ if (strcmp(addr, target_addr) == 0)
+ return strdup(entry->d_name);
+ }
+ }
+ return NULL;
+}
+
+static int nvme_configure_ctrl(nvme_root_t r, nvme_ctrl_t c, const char *path,
+ const char *name)
+{
+ DIR *d;
+ char *host_key;
+
+ d = opendir(path);
+ if (!d) {
+ nvme_msg(r, LOG_ERR, "Failed to open ctrl dir %s, error %d\n",
+ path, errno);
+ errno = ENODEV;
+ return -1;
+ }
+ closedir(d);
+
+ c->fd = -1;
+ c->name = strdup(name);
+ c->sysfs_dir = (char *)path;
+ c->firmware = nvme_get_ctrl_attr(c, "firmware_rev");
+ c->model = nvme_get_ctrl_attr(c, "model");
+ c->state = nvme_get_ctrl_attr(c, "state");
+ c->numa_node = nvme_get_ctrl_attr(c, "numa_node");
+ c->queue_count = nvme_get_ctrl_attr(c, "queue_count");
+ c->serial = nvme_get_ctrl_attr(c, "serial");
+ c->sqsize = nvme_get_ctrl_attr(c, "sqsize");
+ host_key = nvme_get_ctrl_attr(c, "dhchap_secret");
+ if (host_key && c->s && c->s->h && c->s->h->dhchap_key &&
+ (!strcmp(c->s->h->dhchap_key, host_key) ||
+ !strcmp("none", host_key))) {
+ free(host_key);
+ host_key = NULL;
+ }
+ if (host_key)
+ c->dhchap_key = host_key;
+ c->dhchap_ctrl_key = nvme_get_ctrl_attr(c, "dhchap_ctrl_secret");
+ if (c->dhchap_ctrl_key && !strcmp(c->dhchap_ctrl_key, "none")) {
+ free(c->dhchap_ctrl_key);
+ c->dhchap_ctrl_key = NULL;
+ }
+ c->cntrltype = nvme_get_ctrl_attr(c, "cntrltype");
+ c->dctype = nvme_get_ctrl_attr(c, "dctype");
+ c->phy_slot = nvme_ctrl_lookup_phy_slot(r, c->address);
+
+ errno = 0; /* cleanup after nvme_get_ctrl_attr() */
+ return 0;
+}
+
+int nvme_init_ctrl(nvme_host_t h, nvme_ctrl_t c, int instance)
+{
+ _cleanup_free_ char *ctrl_dir = nvme_ctrl_sysfs_dir();
+ _cleanup_free_ char *subsys_name = NULL;
+ _cleanup_free_ char *name = NULL;
+ nvme_subsystem_t s;
+ char *path;
+ int ret;
+
+ ret = asprintf(&name, "nvme%d", instance);
+ if (ret < 0) {
+ errno = ENOMEM;
+ return -1;
+ }
+ ret = asprintf(&path, "%s/nvme%d", ctrl_dir, instance);
+ if (ret < 0) {
+ errno = ENOMEM;
+ return ret;
+ }
+
+ ret = nvme_configure_ctrl(h->r, c, path, name);
+ if (ret < 0) {
+ free(path);
+ return ret;
+ }
+
+ c->address = nvme_get_attr(path, "address");
+ if (!c->address && strcmp(c->transport, "loop")) {
+ errno = ENVME_CONNECT_INVAL_TR;
+ return -1;
+ }
+
+ subsys_name = nvme_ctrl_lookup_subsystem_name(h->r, name);
+ if (!subsys_name) {
+ nvme_msg(h->r, LOG_ERR,
+ "Failed to lookup subsystem name for %s\n",
+ c->name);
+ errno = ENVME_CONNECT_LOOKUP_SUBSYS_NAME;
+ return -1;
+ }
+ s = nvme_lookup_subsystem(h, subsys_name, c->subsysnqn);
+ if (!s) {
+ errno = ENVME_CONNECT_LOOKUP_SUBSYS;
+ return -1;
+ }
+ if (s->subsystype && !strcmp(s->subsystype, "discovery"))
+ c->discovery_ctrl = true;
+ c->s = s;
+ list_add(&s->ctrls, &c->entry);
+ return ret;
+}
+
+static nvme_ctrl_t nvme_ctrl_alloc(nvme_root_t r, nvme_subsystem_t s,
+ const char *path, const char *name)
+{
+ nvme_ctrl_t c, p;
+ _cleanup_free_ char *addr = NULL, *address = NULL;
+ char *a, *e;
+ _cleanup_free_ char *transport = NULL;
+ char *traddr = NULL, *trsvcid = NULL;
+ char *host_traddr = NULL, *host_iface = NULL;
+ int ret;
+
+ transport = nvme_get_attr(path, "transport");
+ if (!transport) {
+ errno = ENXIO;
+ return NULL;
+ }
+ /* Parse 'address' string into components */
+ addr = nvme_get_attr(path, "address");
+ if (!addr) {
+ _cleanup_free_ char *rpath = NULL;
+ char *p = NULL, *_a = NULL;
+
+ /* loop transport might not have an address */
+ if (!strcmp(transport, "loop"))
+ goto skip_address;
+
+ /* Older kernel don't support pcie transport addresses */
+ if (strcmp(transport, "pcie")) {
+ errno = ENXIO;
+ return NULL;
+ }
+ /* Figure out the PCI address from the attribute path */
+ rpath = realpath(path, NULL);
+ if (!rpath) {
+ errno = ENOMEM;
+ return NULL;
+ }
+ a = strtok_r(rpath, "/", &e);
+ while(a && strlen(a)) {
+ if (_a)
+ p = _a;
+ _a = a;
+ if (!strncmp(a, "nvme", 4))
+ break;
+ a = strtok_r(NULL, "/", &e);
+ }
+ if (p)
+ addr = strdup(p);
+ } else if (!strcmp(transport, "pcie")) {
+ /* The 'address' string is the transport address */
+ traddr = addr;
+ } else {
+ address = strdup(addr);
+ a = strtok_r(address, ",", &e);
+ while (a && strlen(a)) {
+ if (!strncmp(a, "traddr=", 7))
+ traddr = a + 7;
+ else if (!strncmp(a, "trsvcid=", 8))
+ trsvcid = a + 8;
+ else if (!strncmp(a, "host_traddr=", 12))
+ host_traddr = a + 12;
+ else if (!strncmp(a, "host_iface=", 11))
+ host_iface = a + 11;
+ a = strtok_r(NULL, ",", &e);
+ }
+ }
+skip_address:
+ p = NULL;
+ do {
+ c = nvme_lookup_ctrl(s, transport, traddr,
+ host_traddr, host_iface, trsvcid, p);
+ if (c) {
+ if (!c->name)
+ break;
+ if (!strcmp(c->name, name)) {
+ nvme_msg(r, LOG_DEBUG,
+ "found existing ctrl %s\n", c->name);
+ break;
+ }
+ nvme_msg(r, LOG_DEBUG, "skipping ctrl %s\n", c->name);
+ p = c;
+ }
+ } while (c);
+ if (!c)
+ c = p;
+ if (!c && !p) {
+ nvme_msg(r, LOG_ERR, "failed to lookup ctrl\n");
+ errno = ENODEV;
+ return NULL;
+ }
+ c->address = addr;
+ addr = NULL;
+ if (s->subsystype && !strcmp(s->subsystype, "discovery"))
+ c->discovery_ctrl = true;
+ ret = nvme_configure_ctrl(r, c, path, name);
+ return (ret < 0) ? NULL : c;
+}
+
+nvme_ctrl_t nvme_scan_ctrl(nvme_root_t r, const char *name)
+{
+ nvme_host_t h;
+ nvme_subsystem_t s;
+ nvme_ctrl_t c;
+ _cleanup_free_ char *path = NULL;
+ _cleanup_free_ char *hostnqn = NULL, *hostid = NULL;
+ _cleanup_free_ char *subsysnqn = NULL, *subsysname = NULL;
+ _cleanup_free_ char *ctrl_dir = nvme_ctrl_sysfs_dir();
+ int ret;
+
+ nvme_msg(r, LOG_DEBUG, "scan controller %s\n", name);
+ ret = asprintf(&path, "%s/%s", ctrl_dir, name);
+ if (ret < 0) {
+ errno = ENOMEM;
+ return NULL;
+ }
+
+ hostnqn = nvme_get_attr(path, "hostnqn");
+ hostid = nvme_get_attr(path, "hostid");
+ h = nvme_lookup_host(r, hostnqn, hostid);
+ if (h) {
+ if (h->dhchap_key)
+ free(h->dhchap_key);
+ h->dhchap_key = nvme_get_attr(path, "dhchap_secret");
+ if (h->dhchap_key && !strcmp(h->dhchap_key, "none")) {
+ free(h->dhchap_key);
+ h->dhchap_key = NULL;
+ }
+ }
+ if (!h) {
+ h = nvme_default_host(r);
+ if (!h) {
+ errno = ENOMEM;
+ return NULL;
+ }
+ }
+
+ subsysnqn = nvme_get_attr(path, "subsysnqn");
+ if (!subsysnqn) {
+ errno = ENXIO;
+ return NULL;
+ }
+ subsysname = nvme_ctrl_lookup_subsystem_name(r, name);
+ if (!subsysname) {
+ nvme_msg(r, LOG_DEBUG,
+ "failed to lookup subsystem for controller %s\n",
+ name);
+ errno = ENXIO;
+ return NULL;
+ }
+ s = nvme_lookup_subsystem(h, subsysname, subsysnqn);
+
+ if (!s) {
+ errno = ENOMEM;
+ return NULL;
+ }
+
+ c = nvme_ctrl_alloc(r, s, path, name);
+ if (!c)
+ return NULL;
+
+ path = NULL;
+ nvme_ctrl_scan_namespaces(r, c);
+ nvme_ctrl_scan_paths(r, c);
+ return c;
+}
+
+void nvme_rescan_ctrl(struct nvme_ctrl *c)
+{
+ nvme_root_t r = c->s && c->s->h ? c->s->h->r : NULL;
+ if (!c->s)
+ return;
+ nvme_ctrl_scan_namespaces(r, c);
+ nvme_ctrl_scan_paths(r, c);
+ nvme_subsystem_scan_namespaces(r, c->s, NULL, NULL);
+}
+
+static int nvme_bytes_to_lba(nvme_ns_t n, off_t offset, size_t count,
+ __u64 *lba, __u16 *nlb)
+{
+ int bs;
+
+ bs = nvme_ns_get_lba_size(n);
+ if (!count || offset & (bs - 1) || count & (bs - 1)) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ *lba = offset >> n->lba_shift;
+ *nlb = (count >> n->lba_shift) - 1;
+ return 0;
+}
+
+int nvme_ns_get_fd(nvme_ns_t n)
+{
+ if (n->fd < 0) {
+ n->fd = nvme_open(n->name);
+ if (n->fd < 0)
+ nvme_msg(root_from_ns(n), LOG_ERR,
+ "Failed to open ns %s, errno %d\n",
+ n->name, errno);
+ }
+
+ return n->fd;
+}
+
+void nvme_ns_release_fd(nvme_ns_t n)
+{
+ if (n->fd < 0)
+ return;
+
+ close(n->fd);
+ n->fd = -1;
+}
+
+nvme_subsystem_t nvme_ns_get_subsystem(nvme_ns_t n)
+{
+ return n->s;
+}
+
+nvme_ctrl_t nvme_ns_get_ctrl(nvme_ns_t n)
+{
+ return n->c;
+}
+
+int nvme_ns_get_nsid(nvme_ns_t n)
+{
+ return n->nsid;
+}
+
+const char *nvme_ns_get_sysfs_dir(nvme_ns_t n)
+{
+ return n->sysfs_dir;
+}
+
+const char *nvme_ns_get_name(nvme_ns_t n)
+{
+ return n->name;
+}
+
+const char *nvme_ns_get_generic_name(nvme_ns_t n)
+{
+ return n->generic_name;
+}
+
+const char *nvme_ns_get_model(nvme_ns_t n)
+{
+ return n->c ? n->c->model : n->s->model;
+}
+
+const char *nvme_ns_get_serial(nvme_ns_t n)
+{
+ return n->c ? n->c->serial : n->s->serial;
+}
+
+const char *nvme_ns_get_firmware(nvme_ns_t n)
+{
+ return n->c ? n->c->firmware : n->s->firmware;
+}
+
+int nvme_ns_get_lba_size(nvme_ns_t n)
+{
+ return n->lba_size;
+}
+
+int nvme_ns_get_meta_size(nvme_ns_t n)
+{
+ return n->meta_size;
+}
+
+uint64_t nvme_ns_get_lba_count(nvme_ns_t n)
+{
+ return n->lba_count;
+}
+
+uint64_t nvme_ns_get_lba_util(nvme_ns_t n)
+{
+ return n->lba_util;
+}
+
+enum nvme_csi nvme_ns_get_csi(nvme_ns_t n)
+{
+ return n->csi;
+}
+
+const uint8_t *nvme_ns_get_eui64(nvme_ns_t n)
+{
+ return n->eui64;
+}
+
+const uint8_t *nvme_ns_get_nguid(nvme_ns_t n)
+{
+ return n->nguid;
+}
+
+void nvme_ns_get_uuid(nvme_ns_t n, unsigned char out[NVME_UUID_LEN])
+{
+ memcpy(out, n->uuid, NVME_UUID_LEN);
+}
+
+int nvme_ns_identify(nvme_ns_t n, struct nvme_id_ns *ns)
+{
+ return nvme_identify_ns(nvme_ns_get_fd(n), nvme_ns_get_nsid(n), ns);
+}
+
+int nvme_ns_identify_descs(nvme_ns_t n, struct nvme_ns_id_desc *descs)
+{
+ return nvme_identify_ns_descs(nvme_ns_get_fd(n), nvme_ns_get_nsid(n), descs);
+}
+
+int nvme_ns_verify(nvme_ns_t n, off_t offset, size_t count)
+{
+ struct nvme_io_args args = {
+ .args_size = sizeof(args),
+ .fd = nvme_ns_get_fd(n),
+ .nsid = nvme_ns_get_nsid(n),
+ .control = 0,
+ .dsm = 0,
+ .dspec = 0,
+ .reftag = 0,
+ .apptag = 0,
+ .appmask = 0,
+ .storage_tag = 0,
+ .data_len = 0,
+ .data = NULL,
+ .metadata_len = 0,
+ .metadata = NULL,
+ .timeout = NVME_DEFAULT_IOCTL_TIMEOUT,
+ .result = NULL,
+ };
+
+ if (nvme_bytes_to_lba(n, offset, count, &args.slba, &args.nlb))
+ return -1;
+
+ return nvme_verify(&args);
+}
+
+int nvme_ns_write_uncorrectable(nvme_ns_t n, off_t offset, size_t count)
+{
+ struct nvme_io_args args = {
+ .args_size = sizeof(args),
+ .fd = nvme_ns_get_fd(n),
+ .nsid = nvme_ns_get_nsid(n),
+ .control = 0,
+ .dsm = 0,
+ .dspec = 0,
+ .reftag = 0,
+ .apptag = 0,
+ .appmask = 0,
+ .storage_tag = 0,
+ .data_len = 0,
+ .data = NULL,
+ .metadata_len = 0,
+ .metadata = NULL,
+ .timeout = NVME_DEFAULT_IOCTL_TIMEOUT,
+ .result = NULL,
+ };
+
+ if (nvme_bytes_to_lba(n, offset, count, &args.slba, &args.nlb))
+ return -1;
+
+ return nvme_write_uncorrectable(&args);
+}
+
+int nvme_ns_write_zeros(nvme_ns_t n, off_t offset, size_t count)
+{
+ struct nvme_io_args args = {
+ .args_size = sizeof(args),
+ .fd = nvme_ns_get_fd(n),
+ .nsid = nvme_ns_get_nsid(n),
+ .control = 0,
+ .dsm = 0,
+ .dspec = 0,
+ .reftag = 0,
+ .apptag = 0,
+ .appmask = 0,
+ .storage_tag = 0,
+ .data_len = 0,
+ .data = NULL,
+ .metadata_len = 0,
+ .metadata = NULL,
+ .timeout = NVME_DEFAULT_IOCTL_TIMEOUT,
+ .result = NULL,
+ };
+
+ if (nvme_bytes_to_lba(n, offset, count, &args.slba, &args.nlb))
+ return -1;
+
+ return nvme_write_zeros(&args);
+}
+
+int nvme_ns_write(nvme_ns_t n, void *buf, off_t offset, size_t count)
+{
+ struct nvme_io_args args = {
+ .args_size = sizeof(args),
+ .fd = nvme_ns_get_fd(n),
+ .nsid = nvme_ns_get_nsid(n),
+ .control = 0,
+ .dsm = 0,
+ .dspec = 0,
+ .reftag = 0,
+ .apptag = 0,
+ .appmask = 0,
+ .storage_tag = 0,
+ .data_len = count,
+ .data = buf,
+ .metadata_len = 0,
+ .metadata = NULL,
+ .timeout = NVME_DEFAULT_IOCTL_TIMEOUT,
+ .result = NULL,
+ };
+
+ if (nvme_bytes_to_lba(n, offset, count, &args.slba, &args.nlb))
+ return -1;
+
+ return nvme_write(&args);
+}
+
+int nvme_ns_read(nvme_ns_t n, void *buf, off_t offset, size_t count)
+{
+ struct nvme_io_args args = {
+ .args_size = sizeof(args),
+ .fd = nvme_ns_get_fd(n),
+ .nsid = nvme_ns_get_nsid(n),
+ .control = 0,
+ .dsm = 0,
+ .dspec = 0,
+ .reftag = 0,
+ .apptag = 0,
+ .appmask = 0,
+ .storage_tag = 0,
+ .data_len = count,
+ .data = buf,
+ .metadata_len = 0,
+ .metadata = NULL,
+ .timeout = NVME_DEFAULT_IOCTL_TIMEOUT,
+ .result = NULL,
+ };
+
+ if (nvme_bytes_to_lba(n, offset, count, &args.slba, &args.nlb))
+ return -1;
+
+ return nvme_read(&args);
+}
+
+int nvme_ns_compare(nvme_ns_t n, void *buf, off_t offset, size_t count)
+{
+ struct nvme_io_args args = {
+ .args_size = sizeof(args),
+ .fd = nvme_ns_get_fd(n),
+ .nsid = nvme_ns_get_nsid(n),
+ .control = 0,
+ .dsm = 0,
+ .dspec = 0,
+ .reftag = 0,
+ .apptag = 0,
+ .appmask = 0,
+ .storage_tag = 0,
+ .data_len = count,
+ .data = buf,
+ .metadata_len = 0,
+ .metadata = NULL,
+ .timeout = NVME_DEFAULT_IOCTL_TIMEOUT,
+ .result = NULL,
+ };
+
+ if (nvme_bytes_to_lba(n, offset, count, &args.slba, &args.nlb))
+ return -1;
+
+ return nvme_compare(&args);
+}
+
+int nvme_ns_flush(nvme_ns_t n)
+{
+ return nvme_flush(nvme_ns_get_fd(n), nvme_ns_get_nsid(n));
+}
+
+static int nvme_strtou64(const char *str, void *res)
+{
+ char *endptr;
+ __u64 v;
+
+ errno = 0;
+ v = strtoull(str, &endptr, 0);
+
+ if (errno != 0)
+ return -errno;
+
+ if (endptr == str) {
+ /* no digits found */
+ return -EINVAL;
+ }
+
+ *(__u64 *)res = v;
+ return 0;
+}
+
+static int nvme_strtou32(const char *str, void *res)
+{
+ char *endptr;
+ __u32 v;
+
+ errno = 0;
+ v = strtol(str, &endptr, 0);
+
+ if (errno != 0)
+ return -errno;
+
+ if (endptr == str) {
+ /* no digits found */
+ return -EINVAL;
+ }
+
+ *(__u32 *)res = v;
+ return 0;
+}
+
+static int nvme_strtoi(const char *str, void *res)
+{
+ char *endptr;
+ int v;
+
+ errno = 0;
+ v = strtol(str, &endptr, 0);
+
+ if (errno != 0)
+ return -errno;
+
+ if (endptr == str) {
+ /* no digits found */
+ return -EINVAL;
+ }
+
+ *(int *)res = v;
+ return 0;
+}
+
+static int nvme_strtoeuid(const char *str, void *res)
+{
+ memcpy(res, str, 8);
+ return 0;
+}
+
+static int nvme_strtouuid(const char *str, void *res)
+{
+ memcpy(res, str, NVME_UUID_LEN);
+ return 0;
+}
+
+struct sysfs_attr_table {
+ void *var;
+ int (*parse)(const char *str, void *res);
+ bool mandatory;
+ const char *name;
+};
+
+#define GETSHIFT(x) (__builtin_ffsll(x) - 1)
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+static int parse_attrs(const char *path, struct sysfs_attr_table *tbl, int size)
+{
+ char *str;
+ int ret, i;
+
+ for (i = 0; i < size; i++) {
+ struct sysfs_attr_table *e = &tbl[i];
+
+ str = nvme_get_attr(path, e->name);
+ if (!str) {
+ if (!e->mandatory)
+ continue;
+ return -ENOENT;
+ }
+ ret = e->parse(str, e->var);
+ free(str);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int nvme_ns_init(const char *path, struct nvme_ns *ns)
+{
+ _cleanup_free_ char *attr = NULL;
+ struct stat sb;
+ int ret;
+
+ struct sysfs_attr_table base[] = {
+ { &ns->nsid, nvme_strtou32, true, "nsid" },
+ { &ns->lba_count, nvme_strtou64, true, "size" },
+ { &ns->lba_size, nvme_strtou64, true, "queue/logical_block_size" },
+ { ns->eui64, nvme_strtoeuid, false, "eui" },
+ { ns->nguid, nvme_strtouuid, false, "nguid" },
+ { ns->uuid, nvme_strtouuid, false, "uuid" }
+ };
+
+ ret = parse_attrs(path, base, ARRAY_SIZE(base));
+ if (ret)
+ return ret;
+
+ ns->lba_shift = GETSHIFT(ns->lba_size);
+
+ if (asprintf(&attr, "%s/csi", path) < 0)
+ return -errno;
+ ret = stat(attr, &sb);
+ if (ret == 0) {
+ /* only available on kernels >= 6.8 */
+ struct sysfs_attr_table ext[] = {
+ { &ns->csi, nvme_strtoi, true, "csi" },
+ { &ns->lba_util, nvme_strtou64, true, "nuse" },
+ { &ns->meta_size, nvme_strtoi, true, "metadata_bytes"},
+
+ };
+
+ ret = parse_attrs(path, ext, ARRAY_SIZE(ext));
+ if (ret)
+ return ret;
+ } else {
+ struct nvme_id_ns *id;
+ uint8_t flbas;
+
+ id = __nvme_alloc(sizeof(*ns));
+ if (!id)
+ return -ENOMEM;
+
+ ret = nvme_ns_identify(ns, id);
+ if (ret)
+ return ret;
+
+ nvme_id_ns_flbas_to_lbaf_inuse(id->flbas, &flbas);
+ ns->lba_count = le64_to_cpu(id->nsze);
+ ns->lba_util = le64_to_cpu(id->nuse);
+ ns->meta_size = le16_to_cpu(id->lbaf[flbas].ms);
+ }
+
+ return 0;
+}
+
+static void nvme_ns_set_generic_name(struct nvme_ns *n, const char *name)
+{
+ char generic_name[PATH_MAX];
+ int instance, head_instance;
+ int ret;
+
+ ret = sscanf(name, "nvme%dn%d", &instance, &head_instance);
+ if (ret != 2)
+ return;
+
+ sprintf(generic_name, "ng%dn%d", instance, head_instance);
+ n->generic_name = strdup(generic_name);
+}
+
+static nvme_ns_t nvme_ns_open(const char *sys_path, const char *name)
+{
+ struct nvme_ns *n;
+
+ n = calloc(1, sizeof(*n));
+ if (!n) {
+ errno = ENOMEM;
+ return NULL;
+ }
+
+ n->fd = -1;
+ n->name = strdup(name);
+
+ nvme_ns_set_generic_name(n, name);
+
+ if (nvme_ns_init(sys_path, n) != 0)
+ goto free_ns;
+
+ list_head_init(&n->paths);
+ list_node_init(&n->entry);
+
+ nvme_ns_release_fd(n); /* Do not leak fds */
+ return n;
+
+free_ns:
+ free(n->generic_name);
+ free(n->name);
+ free(n);
+ return NULL;
+}
+
+static inline bool nvme_ns_is_generic(const char *name)
+{
+ int instance, head_instance;
+
+ if (sscanf(name, "ng%dn%d", &instance, &head_instance) != 2)
+ return false;
+ return true;
+}
+
+static char *nvme_ns_generic_to_blkdev(const char *generic)
+{
+
+ int instance, head_instance;
+ char blkdev[PATH_MAX];
+
+ if (!nvme_ns_is_generic(generic))
+ return strdup(generic);
+
+ sscanf(generic, "ng%dn%d", &instance, &head_instance);
+ sprintf(blkdev, "nvme%dn%d", instance, head_instance);
+
+ return strdup(blkdev);
+}
+
+static struct nvme_ns *__nvme_scan_namespace(const char *sysfs_dir, const char *name)
+{
+ struct nvme_ns *n;
+ _cleanup_free_ char *path = NULL;
+ int ret;
+ _cleanup_free_ char *blkdev = NULL;
+
+ blkdev = nvme_ns_generic_to_blkdev(name);
+ if (!blkdev) {
+ errno = ENOMEM;
+ return NULL;
+ }
+
+ ret = asprintf(&path, "%s/%s", sysfs_dir, blkdev);
+ if (ret < 0) {
+ errno = ENOMEM;
+ return NULL;
+ }
+
+ n = nvme_ns_open(path, blkdev);
+ if (!n)
+ return NULL;
+
+ n->sysfs_dir = path;
+ path = NULL;
+
+ return n;
+}
+
+nvme_ns_t nvme_scan_namespace(const char *name)
+{
+ _cleanup_free_ char *ns_dir = nvme_ns_sysfs_dir();
+
+ return __nvme_scan_namespace(ns_dir, name);
+}
+
+static int nvme_ctrl_scan_namespace(nvme_root_t r, struct nvme_ctrl *c,
+ char *name)
+{
+ struct nvme_ns *n, *_n, *__n;
+
+ nvme_msg(r, LOG_DEBUG, "scan controller %s namespace %s\n",
+ c->name, name);
+ if (!c->s) {
+ nvme_msg(r, LOG_DEBUG, "no subsystem for %s\n", name);
+ errno = EINVAL;
+ return -1;
+ }
+ n = __nvme_scan_namespace(c->sysfs_dir, name);
+ if (!n) {
+ nvme_msg(r, LOG_DEBUG, "failed to scan namespace %s\n", name);
+ return -1;
+ }
+ nvme_ctrl_for_each_ns_safe(c, _n, __n) {
+ if (strcmp(n->name, _n->name))
+ continue;
+ __nvme_free_ns(_n);
+ }
+ n->s = c->s;
+ n->c = c;
+ list_add(&c->namespaces, &n->entry);
+ return 0;
+}
+
+static void nvme_subsystem_set_ns_path(nvme_subsystem_t s, nvme_ns_t n)
+{
+ nvme_ctrl_t c;
+ nvme_path_t p;
+ int ns_ctrl, ns_nsid, ret;
+
+ ret = sscanf(nvme_ns_get_name(n), "nvme%dn%d", &ns_ctrl, &ns_nsid);
+ if (ret != 2)
+ return;
+
+ nvme_subsystem_for_each_ctrl(s, c) {
+ nvme_ctrl_for_each_path(c, p) {
+ int p_subsys, p_ctrl, p_nsid;
+
+ ret = sscanf(nvme_path_get_name(p), "nvme%dc%dn%d",
+ &p_subsys, &p_ctrl, &p_nsid);
+ if (ret != 3)
+ continue;
+ if (ns_ctrl == p_subsys && ns_nsid == p_nsid) {
+ list_add(&n->paths, &p->nentry);
+ p->n = n;
+ }
+ }
+ }
+}
+
+static int nvme_subsystem_scan_namespace(nvme_root_t r, nvme_subsystem_t s,
+ char *name, nvme_scan_filter_t f, void *f_args)
+{
+ struct nvme_ns *n, *_n, *__n;
+
+ nvme_msg(r, LOG_DEBUG, "scan subsystem %s namespace %s\n",
+ s->name, name);
+ n = __nvme_scan_namespace(s->sysfs_dir, name);
+ if (!n) {
+ nvme_msg(r, LOG_DEBUG, "failed to scan namespace %s\n", name);
+ return -1;
+ }
+ if (f && !f(NULL, NULL, n, f_args)) {
+ nvme_msg(r, LOG_DEBUG, "filter out namespace %s\n", name);
+ __nvme_free_ns(n);
+ return 0;
+ }
+ nvme_subsystem_for_each_ns_safe(s, _n, __n) {
+ struct nvme_path *p, *_p;
+
+ if (strcmp(n->name, _n->name))
+ continue;
+ /* Detach paths */
+ nvme_namespace_for_each_path_safe(_n, p, _p) {
+ list_del_init(&p->nentry);
+ p->n = NULL;
+ }
+ list_head_init(&_n->paths);
+ __nvme_free_ns(_n);
+ }
+ n->s = s;
+ list_add(&s->namespaces, &n->entry);
+ nvme_subsystem_set_ns_path(s, n);
+ return 0;
+}
+
+struct nvme_ns *nvme_subsystem_lookup_namespace(struct nvme_subsystem *s,
+ __u32 nsid)
+{
+ struct nvme_ns *n;
+
+ nvme_subsystem_for_each_ns(s, n) {
+ if (nvme_ns_get_nsid(n) == nsid)
+ return n;
+ }
+ return NULL;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 19:11:09 +0000