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diff --git a/doc/rst/tree.rst b/doc/rst/tree.rst new file mode 100644 index 0000000..b73ffae --- /dev/null +++ b/doc/rst/tree.rst @@ -0,0 +1,2482 @@ +.. _tree.h: + +**tree.h** + + +libnvme tree object interface + +.. c:function:: nvme_root_t nvme_create_root (FILE *fp, int log_level) + + Initialize root object + +**Parameters** + +``FILE *fp`` + File descriptor for logging messages + +``int log_level`` + Logging level to use + +**Return** + +Initialized :c:type:`nvme_root_t` object + + +.. c:function:: void nvme_root_set_application (nvme_root_t r, const char *a) + + Specify managing application + +**Parameters** + +``nvme_root_t r`` + :c:type:`nvme_root_t` object + +``const char *a`` + Application string + +**Description** + +Sets the managing application string for **r**. + + +.. c:function:: const char * nvme_root_get_application (nvme_root_t r) + + Get managing application + +**Parameters** + +``nvme_root_t r`` + :c:type:`nvme_root_t` object + +**Description** + +Returns the managing application string for **r** or NULL if not set. + + +.. c:function:: void nvme_root_release_fds (nvme_root_t r) + + Close all opened file descriptors in the tree + +**Parameters** + +``nvme_root_t r`` + :c:type:`nvme_root_t` object + +**Description** + +Controller and Namespace objects cache the file descriptors +of opened nvme devices. This API can be used to close and +clear all cached fds in the tree. + + +.. c:function:: void nvme_free_tree (nvme_root_t r) + + Free root object + +**Parameters** + +``nvme_root_t r`` + :c:type:`nvme_root_t` object + +**Description** + +Free an :c:type:`nvme_root_t` object and all attached objects + + +.. c:function:: nvme_host_t nvme_first_host (nvme_root_t r) + + Start host iterator + +**Parameters** + +``nvme_root_t r`` + :c:type:`nvme_root_t` object + +**Return** + +First :c:type:`nvme_host_t` object in an iterator + + +.. c:function:: nvme_host_t nvme_next_host (nvme_root_t r, nvme_host_t h) + + Next host iterator + +**Parameters** + +``nvme_root_t r`` + :c:type:`nvme_root_t` object + +``nvme_host_t h`` + Previous :c:type:`nvme_host_t` iterator + +**Return** + +Next :c:type:`nvme_host_t` object in an iterator + + +.. c:function:: nvme_root_t nvme_host_get_root (nvme_host_t h) + + Returns nvme_root_t object + +**Parameters** + +``nvme_host_t h`` + :c:type:`nvme_host_t` object + +**Return** + +:c:type:`nvme_root_t` object from **h** + + +.. c:function:: nvme_host_t nvme_lookup_host (nvme_root_t r, const char *hostnqn, const char *hostid) + + Lookup nvme_host_t object + +**Parameters** + +``nvme_root_t r`` + :c:type:`nvme_root_t` object + +``const char *hostnqn`` + Host NQN + +``const char *hostid`` + Host ID + +**Description** + +Lookup a nvme_host_t object based on **hostnqn** and **hostid** +or create one if not found. + +**Return** + +:c:type:`nvme_host_t` object + + +.. c:function:: const char * nvme_host_get_dhchap_key (nvme_host_t h) + + Return host key + +**Parameters** + +``nvme_host_t h`` + Host for which the key should be returned + +**Return** + +DH-HMAC-CHAP host key or NULL if not set + + +.. c:function:: void nvme_host_set_dhchap_key (nvme_host_t h, const char *key) + + set host key + +**Parameters** + +``nvme_host_t h`` + Host for which the key should be set + +``const char *key`` + DH-HMAC-CHAP Key to set or NULL to clear existing key + + +.. c:function:: void nvme_host_set_pdc_enabled (nvme_host_t h, bool enabled) + + Set Persistent Discovery Controller flag + +**Parameters** + +``nvme_host_t h`` + Host for which the falg should be set + +``bool enabled`` + The bool to set the enabled flag + +**Description** + +When nvme_host_set_pdc_enabled() is not used to set the PDC flag, +nvme_host_is_pdc_enabled() will return the default value which was +passed into the function and not the undefined flag value. + + +.. c:function:: bool nvme_host_is_pdc_enabled (nvme_host_t h, bool fallback) + + Is Persistenct Discovery Controller enabled + +**Parameters** + +``nvme_host_t h`` + Host which to check if PDC is enabled + +``bool fallback`` + The fallback default value of the flag when + **nvme_host_set_pdc_enabled** has not be used + to set the flag. + +**Return** + +true if PDC is enabled for **h**, else false + + +.. c:function:: nvme_host_t nvme_default_host (nvme_root_t r) + + Initializes the default host + +**Parameters** + +``nvme_root_t r`` + :c:type:`nvme_root_t` object + +**Description** + +Initializes the default host object based on the values in +/etc/nvme/hostnqn and /etc/nvme/hostid and attaches it to **r**. + +**Return** + +:c:type:`nvme_host_t` object + + +.. c:function:: nvme_subsystem_t nvme_first_subsystem (nvme_host_t h) + + Start subsystem iterator + +**Parameters** + +``nvme_host_t h`` + :c:type:`nvme_host_t` object + +**Return** + +first :c:type:`nvme_subsystem_t` object in an iterator + + +.. c:function:: nvme_subsystem_t nvme_next_subsystem (nvme_host_t h, nvme_subsystem_t s) + + Next subsystem iterator + +**Parameters** + +``nvme_host_t h`` + :c:type:`nvme_host_t` object + +``nvme_subsystem_t s`` + Previous :c:type:`nvme_subsystem_t` iterator + +**Return** + +next :c:type:`nvme_subsystem_t` object in an iterator + + +.. c:function:: nvme_subsystem_t nvme_lookup_subsystem (struct nvme_host *h, const char *name, const char *subsysnqn) + + Lookup nvme_subsystem_t object + +**Parameters** + +``struct nvme_host *h`` + :c:type:`nvme_host_t` object + +``const char *name`` + Name of the subsystem (may be NULL) + +``const char *subsysnqn`` + Subsystem NQN + +**Description** + +Lookup a :c:type:`nvme_subsystem_t` object in **h** base on **name** (if present) +and **subsysnqn** or create one if not found. + +**Return** + +nvme_subsystem_t object + + +.. c:function:: void nvme_free_subsystem (struct nvme_subsystem *s) + + Free a subsystem + +**Parameters** + +``struct nvme_subsystem *s`` + subsystem + +**Description** + +Frees **s** and all related objects. + + +.. c:function:: nvme_host_t nvme_subsystem_get_host (nvme_subsystem_t s) + + Returns nvme_host_t object + +**Parameters** + +``nvme_subsystem_t s`` + subsystem + +**Return** + +:c:type:`nvme_host_t` object from **s** + + +.. c:function:: nvme_ns_t nvme_ctrl_first_ns (nvme_ctrl_t c) + + Start namespace iterator + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +First :c:type:`nvme_ns_t` object of an **c** iterator + + +.. c:function:: nvme_ns_t nvme_ctrl_next_ns (nvme_ctrl_t c, nvme_ns_t n) + + Next namespace iterator + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +``nvme_ns_t n`` + Previous nvme_ns_t iterator + +**Return** + +Next nvme_ns_t object of an **c** iterator + + +.. c:function:: nvme_path_t nvme_ctrl_first_path (nvme_ctrl_t c) + + Start path iterator + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +First :c:type:`nvme_path_t` object of an **c** iterator + + +.. c:function:: nvme_path_t nvme_ctrl_next_path (nvme_ctrl_t c, nvme_path_t p) + + Next path iterator + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +``nvme_path_t p`` + Previous :c:type:`nvme_path_t` object of an **c** iterator + +**Return** + +Next :c:type:`nvme_path_t` object of an **c** iterator + + +.. c:function:: nvme_ctrl_t nvme_subsystem_first_ctrl (nvme_subsystem_t s) + + First ctrl iterator + +**Parameters** + +``nvme_subsystem_t s`` + :c:type:`nvme_subsystem_t` object + +**Return** + +First controller of an **s** iterator + + +.. c:function:: nvme_ctrl_t nvme_subsystem_next_ctrl (nvme_subsystem_t s, nvme_ctrl_t c) + + Next ctrl iterator + +**Parameters** + +``nvme_subsystem_t s`` + :c:type:`nvme_subsystem_t` object + +``nvme_ctrl_t c`` + Previous controller instance of an **s** iterator + +**Return** + +Next controller of an **s** iterator + + +.. c:function:: nvme_path_t nvme_namespace_first_path (nvme_ns_t ns) + + Start path iterator + +**Parameters** + +``nvme_ns_t ns`` + Namespace instance + +**Return** + +First :c:type:`nvme_path_t` object of an **ns** iterator + + +.. c:function:: nvme_path_t nvme_namespace_next_path (nvme_ns_t ns, nvme_path_t p) + + Next path iterator + +**Parameters** + +``nvme_ns_t ns`` + Namespace instance + +``nvme_path_t p`` + Previous :c:type:`nvme_path_t` object of an **ns** iterator + +**Return** + +Next :c:type:`nvme_path_t` object of an **ns** iterator + + +.. c:function:: 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) + + Lookup nvme_ctrl_t object + +**Parameters** + +``nvme_subsystem_t s`` + :c:type:`nvme_subsystem_t` object + +``const char *transport`` + Transport name + +``const char *traddr`` + Transport address + +``const char *host_traddr`` + Host transport address + +``const char *host_iface`` + Host interface name + +``const char *trsvcid`` + Transport service identifier + +``nvme_ctrl_t p`` + Previous controller instance + +**Description** + +Lookup a controller in **s** based on **transport**, **traddr**, +**host_traddr**, **host_iface**, and **trsvcid**. **transport** must be specified, +other fields may be required depending on the transport. A new +object is created if none is found. If **p** is specified the lookup +will start at **p** instead of the first controller. + +**Return** + +Controller instance + + +.. c:function:: 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) + + Locate an existing controller + +**Parameters** + +``nvme_subsystem_t s`` + :c:type:`nvme_subsystem_t` object + +``const char *transport`` + Transport name + +``const char *traddr`` + Transport address + +``const char *trsvcid`` + Transport service identifier + +``const char *subsysnqn`` + Subsystem NQN + +``const char *host_traddr`` + Host transport address + +``const char *host_iface`` + Host interface name + +**Description** + +Lookup a controller in **s** based on **transport**, **traddr**, **trsvcid**, +**subsysnqn**, **host_traddr**, and **host_iface**. **transport** must be specified, +other fields may be required depending on the transport. Parameters set +to NULL will be ignored. + +Unlike nvme_lookup_ctrl(), this function does not create a new object if +an existing controller cannot be found. + +**Return** + +Controller instance on success, NULL otherwise. + + +.. c:function:: 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) + + Check if ctrl **c** matches config params + +**Parameters** + +``struct nvme_ctrl *c`` + An existing controller instance + +``const char *transport`` + Transport name + +``const char *traddr`` + Transport address + +``const char *trsvcid`` + Transport service identifier + +``const char *subsysnqn`` + Subsystem NQN + +``const char *host_traddr`` + Host transport address + +``const char *host_iface`` + Host interface name + +**Description** + +Check that controller **c** matches parameters: **transport**, **traddr**, +**trsvcid**, **subsysnqn**, **host_traddr**, and **host_iface**. Parameters set +to NULL will be ignored. + +**Return** + +true if there's a match, false otherwise. + + +.. c:function:: nvme_ctrl_t 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) + + Allocate an unconnected NVMe controller + +**Parameters** + +``nvme_root_t r`` + NVMe root element + +``const char *subsysnqn`` + Subsystem NQN + +``const char *transport`` + Transport type + +``const char *traddr`` + Transport address + +``const char *host_traddr`` + Host transport address + +``const char *host_iface`` + Host interface name + +``const char *trsvcid`` + Transport service ID + +**Description** + +Creates an unconnected controller to be used for nvme_add_ctrl(). + +**Return** + +Controller instance + + +.. c:function:: nvme_ns_t nvme_subsystem_first_ns (nvme_subsystem_t s) + + Start namespace iterator + +**Parameters** + +``nvme_subsystem_t s`` + :c:type:`nvme_subsystem_t` object + +**Return** + +First :c:type:`nvme_ns_t` object of an **s** iterator + + +.. c:function:: nvme_ns_t nvme_subsystem_next_ns (nvme_subsystem_t s, nvme_ns_t n) + + Next namespace iterator + +**Parameters** + +``nvme_subsystem_t s`` + :c:type:`nvme_subsystem_t` object + +``nvme_ns_t n`` + Previous :c:type:`nvme_ns_t` iterator + +**Return** + +Next :c:type:`nvme_ns_t` object of an **s** iterator + + +.. c:macro:: nvme_for_each_host_safe + +``nvme_for_each_host_safe (r, h, _h)`` + + Traverse host list + +**Parameters** + +``r`` + :c:type:`nvme_root_t` object + +``h`` + :c:type:`nvme_host_t` object + +``_h`` + Temporary :c:type:`nvme_host_t` object + + +.. c:macro:: nvme_for_each_host + +``nvme_for_each_host (r, h)`` + + Traverse host list + +**Parameters** + +``r`` + :c:type:`nvme_root_t` object + +``h`` + :c:type:`nvme_host_t` object + + +.. c:macro:: nvme_for_each_subsystem_safe + +``nvme_for_each_subsystem_safe (h, s, _s)`` + + Traverse subsystems + +**Parameters** + +``h`` + :c:type:`nvme_host_t` object + +``s`` + :c:type:`nvme_subsystem_t` object + +``_s`` + Temporary :c:type:`nvme_subsystem_t` object + + +.. c:macro:: nvme_for_each_subsystem + +``nvme_for_each_subsystem (h, s)`` + + Traverse subsystems + +**Parameters** + +``h`` + :c:type:`nvme_host_t` object + +``s`` + :c:type:`nvme_subsystem_t` object + + +.. c:macro:: nvme_subsystem_for_each_ctrl_safe + +``nvme_subsystem_for_each_ctrl_safe (s, c, _c)`` + + Traverse controllers + +**Parameters** + +``s`` + :c:type:`nvme_subsystem_t` object + +``c`` + Controller instance + +``_c`` + A :c:type:`nvme_ctrl_t_node` to use as temporary storage + + +.. c:macro:: nvme_subsystem_for_each_ctrl + +``nvme_subsystem_for_each_ctrl (s, c)`` + + Traverse controllers + +**Parameters** + +``s`` + :c:type:`nvme_subsystem_t` object + +``c`` + Controller instance + + +.. c:macro:: nvme_ctrl_for_each_ns_safe + +``nvme_ctrl_for_each_ns_safe (c, n, _n)`` + + Traverse namespaces + +**Parameters** + +``c`` + Controller instance + +``n`` + :c:type:`nvme_ns_t` object + +``_n`` + A :c:type:`nvme_ns_t_node` to use as temporary storage + + +.. c:macro:: nvme_ctrl_for_each_ns + +``nvme_ctrl_for_each_ns (c, n)`` + + Traverse namespaces + +**Parameters** + +``c`` + Controller instance + +``n`` + :c:type:`nvme_ns_t` object + + +.. c:macro:: nvme_ctrl_for_each_path_safe + +``nvme_ctrl_for_each_path_safe (c, p, _p)`` + + Traverse paths + +**Parameters** + +``c`` + Controller instance + +``p`` + :c:type:`nvme_path_t` object + +``_p`` + A :c:type:`nvme_path_t_node` to use as temporary storage + + +.. c:macro:: nvme_ctrl_for_each_path + +``nvme_ctrl_for_each_path (c, p)`` + + Traverse paths + +**Parameters** + +``c`` + Controller instance + +``p`` + :c:type:`nvme_path_t` object + + +.. c:macro:: nvme_subsystem_for_each_ns_safe + +``nvme_subsystem_for_each_ns_safe (s, n, _n)`` + + Traverse namespaces + +**Parameters** + +``s`` + :c:type:`nvme_subsystem_t` object + +``n`` + :c:type:`nvme_ns_t` object + +``_n`` + A :c:type:`nvme_ns_t_node` to use as temporary storage + + +.. c:macro:: nvme_subsystem_for_each_ns + +``nvme_subsystem_for_each_ns (s, n)`` + + Traverse namespaces + +**Parameters** + +``s`` + :c:type:`nvme_subsystem_t` object + +``n`` + :c:type:`nvme_ns_t` object + + +.. c:macro:: nvme_namespace_for_each_path_safe + +``nvme_namespace_for_each_path_safe (n, p, _p)`` + + Traverse paths + +**Parameters** + +``n`` + Namespace instance + +``p`` + :c:type:`nvme_path_t` object + +``_p`` + A :c:type:`nvme_path_t_node` to use as temporary storage + + +.. c:macro:: nvme_namespace_for_each_path + +``nvme_namespace_for_each_path (n, p)`` + + Traverse paths + +**Parameters** + +``n`` + Namespace instance + +``p`` + :c:type:`nvme_path_t` object + + +.. c:function:: int nvme_ns_get_fd (nvme_ns_t n) + + Get associated file descriptor + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Description** + +libnvme will open() the file (if not already opened) and keep +an internal copy of the file descriptor. Following calls to +this API retrieve the internal cached copy of the file +descriptor. The file will remain opened and the fd will +remain cached until the ns object is deleted or +nvme_ns_release_fd() is called. + +**Return** + +File descriptor associated with **n** or -1 + + +.. c:function:: void nvme_ns_release_fd (nvme_ns_t n) + + Close fd and clear fd from ns object + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + + +.. c:function:: int nvme_ns_get_nsid (nvme_ns_t n) + + NSID of a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Return** + +NSID of **n** + + +.. c:function:: int nvme_ns_get_lba_size (nvme_ns_t n) + + LBA size of a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Return** + +LBA size of **n** + + +.. c:function:: int nvme_ns_get_meta_size (nvme_ns_t n) + + Metadata size of a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Return** + +Metadata size of **n** + + +.. c:function:: uint64_t nvme_ns_get_lba_count (nvme_ns_t n) + + LBA count of a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Return** + +LBA count of **n** + + +.. c:function:: uint64_t nvme_ns_get_lba_util (nvme_ns_t n) + + LBA utilization of a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Return** + +LBA utilization of **n** + + +.. c:function:: enum nvme_csi nvme_ns_get_csi (nvme_ns_t n) + + Command set identifier of a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Return** + +The namespace's command set identifier in use + + +.. c:function:: const uint8_t * nvme_ns_get_eui64 (nvme_ns_t n) + + 64-bit eui of a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Return** + +A pointer to the 64-bit eui + + +.. c:function:: const uint8_t * nvme_ns_get_nguid (nvme_ns_t n) + + 128-bit nguid of a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Return** + +A pointer to the 128-bit nguid + + +.. c:function:: void nvme_ns_get_uuid (nvme_ns_t n, unsigned char out[NVME_UUID_LEN]) + + UUID of a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +``unsigned char out[NVME_UUID_LEN]`` + buffer for the UUID + +**Description** + +Copies the namespace's uuid into **out** + + +.. c:function:: const char * nvme_ns_get_sysfs_dir (nvme_ns_t n) + + sysfs directory of a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Return** + +sysfs directory name of **n** + + +.. c:function:: const char * nvme_ns_get_name (nvme_ns_t n) + + sysfs name of a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Return** + +sysfs name of **n** + + +.. c:function:: const char * nvme_ns_get_generic_name (nvme_ns_t n) + + Returns name of generic namespace chardev. + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Return** + +Name of generic namespace chardev + + +.. c:function:: const char * nvme_ns_get_firmware (nvme_ns_t n) + + Firmware string of a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Return** + +Firmware string of **n** + + +.. c:function:: const char * nvme_ns_get_serial (nvme_ns_t n) + + Serial number of a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Return** + +Serial number string of **n** + + +.. c:function:: const char * nvme_ns_get_model (nvme_ns_t n) + + Model of a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Return** + +Model string of **n** + + +.. c:function:: nvme_subsystem_t nvme_ns_get_subsystem (nvme_ns_t n) + + :c:type:`nvme_subsystem_t` of a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Return** + +nvme_subsystem_t object of **n** + + +.. c:function:: nvme_ctrl_t nvme_ns_get_ctrl (nvme_ns_t n) + + :c:type:`nvme_ctrl_t` of a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Description** + +nvme_ctrl_t object may be NULL for a multipathed namespace + +**Return** + +nvme_ctrl_t object of **n** if present + + +.. c:function:: void nvme_free_ns (struct nvme_ns *n) + + Free a namespace object + +**Parameters** + +``struct nvme_ns *n`` + Namespace instance + + +.. c:function:: int nvme_ns_read (nvme_ns_t n, void *buf, off_t offset, size_t count) + + Read from a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +``void *buf`` + Buffer into which the data will be transferred + +``off_t offset`` + LBA offset of **n** + +``size_t count`` + Number of sectors in **buf** + +**Return** + +Number of sectors read or -1 on error. + + +.. c:function:: int nvme_ns_write (nvme_ns_t n, void *buf, off_t offset, size_t count) + + Write to a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +``void *buf`` + Buffer with data to be written + +``off_t offset`` + LBA offset of **n** + +``size_t count`` + Number of sectors in **buf** + +**Return** + +Number of sectors written or -1 on error + + +.. c:function:: int nvme_ns_verify (nvme_ns_t n, off_t offset, size_t count) + + Verify data on a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +``off_t offset`` + LBA offset of **n** + +``size_t count`` + Number of sectors to be verified + +**Return** + +Number of sectors verified + + +.. c:function:: int nvme_ns_compare (nvme_ns_t n, void *buf, off_t offset, size_t count) + + Compare data on a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +``void *buf`` + Buffer with data to be compared + +``off_t offset`` + LBA offset of **n** + +``size_t count`` + Number of sectors in **buf** + +**Return** + +Number of sectors compared + + +.. c:function:: int nvme_ns_write_zeros (nvme_ns_t n, off_t offset, size_t count) + + Write zeros to a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +``off_t offset`` + LBA offset in **n** + +``size_t count`` + Number of sectors to be written + +**Return** + +Number of sectors written + + +.. c:function:: int nvme_ns_write_uncorrectable (nvme_ns_t n, off_t offset, size_t count) + + Issus a 'write uncorrectable' command + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +``off_t offset`` + LBA offset in **n** + +``size_t count`` + Number of sectors to be written + +**Return** + +Number of sectors written + + +.. c:function:: int nvme_ns_flush (nvme_ns_t n) + + Flush data to a namespace + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +**Return** + +0 on success, -1 on error. + + +.. c:function:: int nvme_ns_identify (nvme_ns_t n, struct nvme_id_ns *ns) + + Issue an 'identify namespace' command + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +``struct nvme_id_ns *ns`` + :c:type:`nvme_id_ns` buffer + +**Description** + +Writes the data returned by the 'identify namespace' command +into **ns**. + +**Return** + +0 on success, -1 on error. + + +.. c:function:: int nvme_ns_identify_descs (nvme_ns_t n, struct nvme_ns_id_desc *descs) + + Issue an 'identify descriptors' command + +**Parameters** + +``nvme_ns_t n`` + Namespace instance + +``struct nvme_ns_id_desc *descs`` + List of identify descriptors + +**Description** + +Writes the data returned by the 'identify descriptors' command +into **descs**. + +**Return** + +0 on success, -1 on error. + + +.. c:function:: const char * nvme_path_get_name (nvme_path_t p) + + sysfs name of an :c:type:`nvme_path_t` object + +**Parameters** + +``nvme_path_t p`` + :c:type:`nvme_path_t` object + +**Return** + +sysfs name of **p** + + +.. c:function:: const char * nvme_path_get_sysfs_dir (nvme_path_t p) + + sysfs directory of an nvme_path_t object + +**Parameters** + +``nvme_path_t p`` + :c:type:`nvme_path_t` object + +**Return** + +sysfs directory of **p** + + +.. c:function:: const char * nvme_path_get_ana_state (nvme_path_t p) + + ANA state of an nvme_path_t object + +**Parameters** + +``nvme_path_t p`` + :c:type:`nvme_path_t` object + +**Return** + +ANA (Asynchronous Namespace Access) state of **p** + + +.. c:function:: nvme_ctrl_t nvme_path_get_ctrl (nvme_path_t p) + + Parent controller of an nvme_path_t object + +**Parameters** + +``nvme_path_t p`` + :c:type:`nvme_path_t` object + +**Return** + +Parent controller if present + + +.. c:function:: nvme_ns_t nvme_path_get_ns (nvme_path_t p) + + Parent namespace of an nvme_path_t object + +**Parameters** + +``nvme_path_t p`` + :c:type:`nvme_path_t` object + +**Return** + +Parent namespace if present + + +.. c:function:: int nvme_ctrl_get_fd (nvme_ctrl_t c) + + Get associated file descriptor + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Description** + +libnvme will open() the file (if not already opened) and keep +an internal copy of the file descriptor. Following calls to +this API retrieve the internal cached copy of the file +descriptor. The file will remain opened and the fd will +remain cached until the controller object is deleted or +nvme_ctrl_release_fd() is called. + +**Return** + +File descriptor associated with **c** or -1 + + +.. c:function:: void nvme_ctrl_release_fd (nvme_ctrl_t c) + + Close fd and clear fd from controller object + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + + +.. c:function:: const char * nvme_ctrl_get_name (nvme_ctrl_t c) + + sysfs name of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +sysfs name of **c** + + +.. c:function:: const char * nvme_ctrl_get_sysfs_dir (nvme_ctrl_t c) + + sysfs directory of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +sysfs directory name of **c** + + +.. c:function:: const char * nvme_ctrl_get_address (nvme_ctrl_t c) + + Address string of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +NVMe-over-Fabrics address string of **c** or empty string +of no address is present. + + +.. c:function:: char * nvme_ctrl_get_src_addr (nvme_ctrl_t c, char *src_addr, size_t src_addr_len) + + Extract src_addr from the c->address string + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +``char *src_addr`` + Where to copy the src_addr. Size must be at least INET6_ADDRSTRLEN. + +``size_t src_addr_len`` + Length of the buffer **src_addr**. + +**Return** + +Pointer to **src_addr** on success. NULL on failure to extract the src_addr. + + +.. c:function:: const char * nvme_ctrl_get_phy_slot (nvme_ctrl_t c) + + PCI physical slot number of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +PCI physical slot number of **c** or empty string if slot +number is not present. + + +.. c:function:: const char * nvme_ctrl_get_firmware (nvme_ctrl_t c) + + Firmware string of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +Firmware string of **c** + + +.. c:function:: const char * nvme_ctrl_get_model (nvme_ctrl_t c) + + Model of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +Model string of **c** + + +.. c:function:: const char * nvme_ctrl_get_state (nvme_ctrl_t c) + + Running state of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +String indicating the running state of **c** + + +.. c:function:: const char * nvme_ctrl_get_numa_node (nvme_ctrl_t c) + + NUMA node of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +String indicating the NUMA node + + +.. c:function:: const char * nvme_ctrl_get_queue_count (nvme_ctrl_t c) + + Queue count of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +Queue count of **c** + + +.. c:function:: const char * nvme_ctrl_get_serial (nvme_ctrl_t c) + + Serial number of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +Serial number string of **c** + + +.. c:function:: const char * nvme_ctrl_get_sqsize (nvme_ctrl_t c) + + SQ size of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +SQ size (as string) of **c** + + +.. c:function:: const char * nvme_ctrl_get_transport (nvme_ctrl_t c) + + Transport type of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +Transport type of **c** + + +.. c:function:: const char * nvme_ctrl_get_subsysnqn (nvme_ctrl_t c) + + Subsystem NQN of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +Subsystem NQN of **c** + + +.. c:function:: nvme_subsystem_t nvme_ctrl_get_subsystem (nvme_ctrl_t c) + + Parent subsystem of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +Parent nvme_subsystem_t object + + +.. c:function:: const char * nvme_ctrl_get_traddr (nvme_ctrl_t c) + + Transport address of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +Transport address of **c** + + +.. c:function:: const char * nvme_ctrl_get_trsvcid (nvme_ctrl_t c) + + Transport service identifier of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +Transport service identifier of **c** (if present) + + +.. c:function:: const char * nvme_ctrl_get_host_traddr (nvme_ctrl_t c) + + Host transport address of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +Host transport address of **c** (if present) + + +.. c:function:: const char * nvme_ctrl_get_host_iface (nvme_ctrl_t c) + + Host interface name of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +Host interface name of **c** (if present) + + +.. c:function:: const char * nvme_ctrl_get_dhchap_host_key (nvme_ctrl_t c) + + Return host key + +**Parameters** + +``nvme_ctrl_t c`` + Controller to be checked + +**Return** + +DH-HMAC-CHAP host key or NULL if not set + + +.. c:function:: void nvme_ctrl_set_dhchap_host_key (nvme_ctrl_t c, const char *key) + + Set host key + +**Parameters** + +``nvme_ctrl_t c`` + Host for which the key should be set + +``const char *key`` + DH-HMAC-CHAP Key to set or NULL to clear existing key + + +.. c:function:: const char * nvme_ctrl_get_dhchap_key (nvme_ctrl_t c) + + Return controller key + +**Parameters** + +``nvme_ctrl_t c`` + Controller for which the key should be set + +**Return** + +DH-HMAC-CHAP controller key or NULL if not set + + +.. c:function:: void nvme_ctrl_set_dhchap_key (nvme_ctrl_t c, const char *key) + + Set controller key + +**Parameters** + +``nvme_ctrl_t c`` + Controller for which the key should be set + +``const char *key`` + DH-HMAC-CHAP Key to set or NULL to clear existing key + + +.. c:function:: struct nvme_fabrics_config * nvme_ctrl_get_config (nvme_ctrl_t c) + + Fabrics configuration of a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +Fabrics configuration of **c** + + +.. c:function:: void nvme_ctrl_set_discovered (nvme_ctrl_t c, bool discovered) + + Set the 'discovered' flag + +**Parameters** + +``nvme_ctrl_t c`` + nvme_ctrl_t object + +``bool discovered`` + Value of the 'discovered' flag + +**Description** + +Set the 'discovered' flag of **c** to **discovered** + + +.. c:function:: bool nvme_ctrl_is_discovered (nvme_ctrl_t c) + + Returns the value of the 'discovered' flag + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +Value of the 'discovered' flag of **c** + + +.. c:function:: void nvme_ctrl_set_persistent (nvme_ctrl_t c, bool persistent) + + Set the 'persistent' flag + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +``bool persistent`` + value of the 'persistent' flag + +**Description** + +Set the 'persistent' flag of **c** to **persistent** + + +.. c:function:: bool nvme_ctrl_is_persistent (nvme_ctrl_t c) + + Returns the value of the 'persistent' flag + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Return** + +Value of the 'persistent' flag of **c** + + +.. c:function:: void nvme_ctrl_set_discovery_ctrl (nvme_ctrl_t c, bool discovery) + + Set the 'discovery_ctrl' flag + +**Parameters** + +``nvme_ctrl_t c`` + Controller to be modified + +``bool discovery`` + value of the discovery_ctrl flag + +**Description** + +Sets the 'discovery_ctrl' flag in **c** to specify whether +**c** connects to a discovery subsystem. + + +.. c:function:: bool nvme_ctrl_is_discovery_ctrl (nvme_ctrl_t c) + + Check the 'discovery_ctrl' flag + +**Parameters** + +``nvme_ctrl_t c`` + Controller to be checked + +**Description** + +Returns the value of the 'discovery_ctrl' flag which specifies whether +**c** connects to a discovery subsystem. + +**Return** + +Value of the 'discover_ctrl' flag + + +.. c:function:: void nvme_ctrl_set_unique_discovery_ctrl (nvme_ctrl_t c, bool unique) + + Set the 'unique_discovery_ctrl' flag + +**Parameters** + +``nvme_ctrl_t c`` + Controller to be modified + +``bool unique`` + value of the unique_disc_ctrl flag + +**Description** + +Sets the 'unique_discovery_ctrl' flag in **c** to specify wheter +**c** is a unique discovery controller + + +.. c:function:: bool nvme_ctrl_is_unique_discovery_ctrl (nvme_ctrl_t c) + + Check the 'unique_discovery_ctrl' flag + +**Parameters** + +``nvme_ctrl_t c`` + Controller to be checked + +**Return** + +Value of the 'unique_discovery_ctrl' flag + + +.. c:function:: int nvme_ctrl_identify (nvme_ctrl_t c, struct nvme_id_ctrl *id) + + Issues an 'identify controller' command + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +``struct nvme_id_ctrl *id`` + Identify controller data structure + +**Description** + +Issues an 'identify controller' command to **c** and copies the +data into **id**. + +**Return** + +0 on success or -1 on failure. + + +.. c:function:: int nvme_disconnect_ctrl (nvme_ctrl_t c) + + Disconnect a controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +**Description** + +Issues a 'disconnect' fabrics command to **c** + +**Return** + +0 on success, -1 on failure. + + +.. c:function:: nvme_ctrl_t nvme_scan_ctrl (nvme_root_t r, const char *name) + + Scan on a controller + +**Parameters** + +``nvme_root_t r`` + nvme_root_t object + +``const char *name`` + Name of the controller + +**Description** + +Scans a controller with sysfs name **name** and add it to **r**. + +**Return** + +nvme_ctrl_t object + + +.. c:function:: void nvme_rescan_ctrl (nvme_ctrl_t c) + + Rescan an existing controller + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + + +.. c:function:: int nvme_init_ctrl (nvme_host_t h, nvme_ctrl_t c, int instance) + + Initialize nvme_ctrl_t object for an existing controller. + +**Parameters** + +``nvme_host_t h`` + nvme_host_t object + +``nvme_ctrl_t c`` + nvme_ctrl_t object + +``int instance`` + Instance number (e.g. 1 for nvme1) + +**Return** + +The ioctl() return code. Typically 0 on success. + + +.. c:function:: void nvme_free_ctrl (struct nvme_ctrl *c) + + Free controller + +**Parameters** + +``struct nvme_ctrl *c`` + Controller instance + + +.. c:function:: void nvme_unlink_ctrl (struct nvme_ctrl *c) + + Unlink controller + +**Parameters** + +``struct nvme_ctrl *c`` + Controller instance + + +.. c:function:: const char * nvme_subsystem_get_nqn (nvme_subsystem_t s) + + Retrieve NQN from subsystem + +**Parameters** + +``nvme_subsystem_t s`` + nvme_subsystem_t object + +**Return** + +NQN of subsystem + + +.. c:function:: const char * nvme_subsystem_get_sysfs_dir (nvme_subsystem_t s) + + sysfs directory of an nvme_subsystem_t object + +**Parameters** + +``nvme_subsystem_t s`` + nvme_subsystem_t object + +**Return** + +sysfs directory name of **s** + + +.. c:function:: const char * nvme_subsystem_get_name (nvme_subsystem_t s) + + sysfs name of an nvme_subsystem_t object + +**Parameters** + +``nvme_subsystem_t s`` + nvme_subsystem_t object + +**Return** + +sysfs name of **s** + + +.. c:function:: const char * nvme_subsystem_get_type (nvme_subsystem_t s) + + Returns the type of a subsystem + +**Parameters** + +``nvme_subsystem_t s`` + nvme_subsystem_t object + +**Description** + +Returns the subsystem type of **s**. + +**Return** + +'nvm' or 'discovery' + + +.. c:function:: const char * nvme_subsystem_get_application (nvme_subsystem_t s) + + Return the application string + +**Parameters** + +``nvme_subsystem_t s`` + nvme_subsystem_t object + +**Return** + +Managing application string or NULL if not set. + + +.. c:function:: void nvme_subsystem_set_application (nvme_subsystem_t s, const char *a) + + Set the application string + +**Parameters** + +``nvme_subsystem_t s`` + nvme_subsystem_t object + +``const char *a`` + application string + +**Description** + +Sets the managing application string for **s**. + + +.. c:function:: const char * nvme_subsystem_get_iopolicy (nvme_subsystem_t s) + + Return the IO policy of subsytem + +**Parameters** + +``nvme_subsystem_t s`` + nvme_subsystem_t object + +**Return** + +IO policy used by current subsystem + + +.. c:function:: int nvme_scan_topology (nvme_root_t r, nvme_scan_filter_t f, void *f_args) + + Scan NVMe topology and apply filter + +**Parameters** + +``nvme_root_t r`` + nvme_root_t object + +``nvme_scan_filter_t f`` + filter to apply + +``void *f_args`` + user-specified argument to **f** + +**Description** + +Scans the NVMe topology and filters out the resulting elements +by applying **f**. + +**Return** + +Number of elements scanned + + +.. c:function:: const char * nvme_host_get_hostnqn (nvme_host_t h) + + Host NQN of an nvme_host_t object + +**Parameters** + +``nvme_host_t h`` + nvme_host_t object + +**Return** + +Host NQN of **h** + + +.. c:function:: const char * nvme_host_get_hostid (nvme_host_t h) + + Host ID of an nvme_host_t object + +**Parameters** + +``nvme_host_t h`` + nvme_host_t object + +**Return** + +Host ID of **h** + + +.. c:function:: void nvme_host_release_fds (struct nvme_host *h) + + Close all opened file descriptors under host + +**Parameters** + +``struct nvme_host *h`` + nvme_host_t object + +**Description** + +Controller and Namespace objects cache the file descriptors +of opened nvme devices. This API can be used to close and +clear all cached fds under this host. + + +.. c:function:: void nvme_free_host (nvme_host_t h) + + Free nvme_host_t object + +**Parameters** + +``nvme_host_t h`` + nvme_host_t object + + +.. c:function:: nvme_root_t nvme_scan (const char *config_file) + + Scan NVMe topology + +**Parameters** + +``const char *config_file`` + Configuration file + +**Return** + +nvme_root_t object of found elements + + +.. c:function:: int nvme_read_config (nvme_root_t r, const char *config_file) + + Read NVMe JSON configuration file + +**Parameters** + +``nvme_root_t r`` + nvme_root_t object + +``const char *config_file`` + JSON configuration file + +**Description** + +Read in the contents of **config_file** and merge them with +the elements in **r**. + +**Return** + +0 on success, -1 on failure with errno set. + + +.. c:function:: void nvme_refresh_topology (nvme_root_t r) + + Refresh nvme_root_t object contents + +**Parameters** + +``nvme_root_t r`` + nvme_root_t object + +**Description** + +Removes all elements in **r** and rescans the existing topology. + + +.. c:function:: int nvme_update_config (nvme_root_t r) + + Update JSON configuration + +**Parameters** + +``nvme_root_t r`` + nvme_root_t object + +**Description** + +Updates the JSON configuration file with the contents of **r**. + +**Return** + +0 on success, -1 on failure. + + +.. c:function:: int nvme_dump_config (nvme_root_t r) + + Print the JSON configuration + +**Parameters** + +``nvme_root_t r`` + nvme_root_t object + +**Description** + +Prints the current contents of the JSON configuration +file to stdout. + +**Return** + +0 on success, -1 on failure. + + +.. c:function:: int nvme_dump_tree (nvme_root_t r) + + Dump internal object tree + +**Parameters** + +``nvme_root_t r`` + nvme_root_t object + +**Description** + +Prints the internal object tree in JSON format +to stdout. + +**Return** + +0 on success, -1 on failure. + + +.. c:function:: char * nvme_get_attr (const char *d, const char *attr) + + Read sysfs attribute + +**Parameters** + +``const char *d`` + sysfs directory + +``const char *attr`` + sysfs attribute name + +**Return** + +String with the contents of **attr** or ``NULL`` in case of an empty value + or in case of an error (indicated by non-zero errno code). + + +.. c:function:: char * nvme_get_subsys_attr (nvme_subsystem_t s, const char *attr) + + Read subsystem sysfs attribute + +**Parameters** + +``nvme_subsystem_t s`` + nvme_subsystem_t object + +``const char *attr`` + sysfs attribute name + +**Return** + +String with the contents of **attr** or ``NULL`` in case of an empty value + or in case of an error (indicated by non-zero errno code). + + +.. c:function:: char * nvme_get_ctrl_attr (nvme_ctrl_t c, const char *attr) + + Read controller sysfs attribute + +**Parameters** + +``nvme_ctrl_t c`` + Controller instance + +``const char *attr`` + sysfs attribute name + +**Return** + +String with the contents of **attr** or ``NULL`` in case of an empty value + or in case of an error (indicated by non-zero errno code). + + +.. c:function:: char * nvme_get_ns_attr (nvme_ns_t n, const char *attr) + + Read namespace sysfs attribute + +**Parameters** + +``nvme_ns_t n`` + nvme_ns_t object + +``const char *attr`` + sysfs attribute name + +**Return** + +String with the contents of **attr** or ``NULL`` in case of an empty value + or in case of an error (indicated by non-zero errno code). + + +.. c:function:: nvme_ns_t nvme_subsystem_lookup_namespace (struct nvme_subsystem *s, __u32 nsid) + + lookup namespace by NSID + +**Parameters** + +``struct nvme_subsystem *s`` + nvme_subsystem_t object + +``__u32 nsid`` + Namespace id + +**Return** + +nvme_ns_t of the namespace with id **nsid** in subsystem **s** + + +.. c:function:: void nvme_subsystem_release_fds (struct nvme_subsystem *s) + + Close all opened fds under subsystem + +**Parameters** + +``struct nvme_subsystem *s`` + nvme_subsystem_t object + +**Description** + +Controller and Namespace objects cache the file descriptors +of opened nvme devices. This API can be used to close and +clear all cached fds under this subsystem. + + +.. c:function:: char * nvme_get_path_attr (nvme_path_t p, const char *attr) + + Read path sysfs attribute + +**Parameters** + +``nvme_path_t p`` + nvme_path_t object + +``const char *attr`` + sysfs attribute name + +**Return** + +String with the contents of **attr** or ``NULL`` in case of an empty value + or in case of an error (indicated by non-zero errno code). + + +.. c:function:: nvme_ns_t nvme_scan_namespace (const char *name) + + scan namespace based on sysfs name + +**Parameters** + +``const char *name`` + sysfs name of the namespace to scan + +**Return** + +nvme_ns_t object or NULL if not found. + + +.. c:function:: const char * nvme_host_get_hostsymname (nvme_host_t h) + + Get the host's symbolic name + +**Parameters** + +``nvme_host_t h`` + Host for which the symbolic name should be returned. + +**Return** + +The symbolic name or NULL if a symbolic name hasn't been +configure. + + +.. c:function:: void nvme_host_set_hostsymname (nvme_host_t h, const char *hostsymname) + + Set the host's symbolic name + +**Parameters** + +``nvme_host_t h`` + Host for which the symbolic name should be set. + +``const char *hostsymname`` + Symbolic name + + |