// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 1999 Eric Youngdale * Copyright (C) 2014 Christoph Hellwig * * SCSI queueing library. * Initial versions: Eric Youngdale ([email protected]). * Based upon conversations with large numbers * of people at Linux Expo. */ #include <linux/bio.h> #include <linux/bitops.h> #include <linux/blkdev.h> #include <linux/completion.h> #include <linux/kernel.h> #include <linux/export.h> #include <linux/init.h> #include <linux/pci.h> #include <linux/delay.h> #include <linux/hardirq.h> #include <linux/scatterlist.h> #include <linux/blk-mq.h> #include <linux/blk-integrity.h> #include <linux/ratelimit.h> #include <asm/unaligned.h> #include <scsi/scsi.h> #include <scsi/scsi_cmnd.h> #include <scsi/scsi_dbg.h> #include <scsi/scsi_device.h> #include <scsi/scsi_driver.h> #include <scsi/scsi_eh.h> #include <scsi/scsi_host.h> #include <scsi/scsi_transport.h> /* scsi_init_limits() */ #include <scsi/scsi_dh.h> #include <trace/events/scsi.h> #include "scsi_debugfs.h" #include "scsi_priv.h" #include "scsi_logging.h" /* * Size of integrity metadata is usually small, 1 inline sg should * cover normal cases. */ #ifdef CONFIG_ARCH_NO_SG_CHAIN #define SCSI_INLINE_PROT_SG_CNT … #define SCSI_INLINE_SG_CNT … #else #define SCSI_INLINE_PROT_SG_CNT … #define SCSI_INLINE_SG_CNT … #endif static struct kmem_cache *scsi_sense_cache; static DEFINE_MUTEX(scsi_sense_cache_mutex); static void scsi_mq_uninit_cmd(struct scsi_cmnd *cmd); int scsi_init_sense_cache(struct Scsi_Host *shost) { … } static void scsi_set_blocked(struct scsi_cmnd *cmd, int reason) { … } static void scsi_mq_requeue_cmd(struct scsi_cmnd *cmd, unsigned long msecs) { … } /** * __scsi_queue_insert - private queue insertion * @cmd: The SCSI command being requeued * @reason: The reason for the requeue * @unbusy: Whether the queue should be unbusied * * This is a private queue insertion. The public interface * scsi_queue_insert() always assumes the queue should be unbusied * because it's always called before the completion. This function is * for a requeue after completion, which should only occur in this * file. */ static void __scsi_queue_insert(struct scsi_cmnd *cmd, int reason, bool unbusy) { … } /** * scsi_queue_insert - Reinsert a command in the queue. * @cmd: command that we are adding to queue. * @reason: why we are inserting command to queue. * * We do this for one of two cases. Either the host is busy and it cannot accept * any more commands for the time being, or the device returned QUEUE_FULL and * can accept no more commands. * * Context: This could be called either from an interrupt context or a normal * process context. */ void scsi_queue_insert(struct scsi_cmnd *cmd, int reason) { … } void scsi_failures_reset_retries(struct scsi_failures *failures) { … } EXPORT_SYMBOL_GPL(…); /** * scsi_check_passthrough - Determine if passthrough scsi_cmnd needs a retry. * @scmd: scsi_cmnd to check. * @failures: scsi_failures struct that lists failures to check for. * * Returns -EAGAIN if the caller should retry else 0. */ static int scsi_check_passthrough(struct scsi_cmnd *scmd, struct scsi_failures *failures) { … } /** * scsi_execute_cmd - insert request and wait for the result * @sdev: scsi_device * @cmd: scsi command * @opf: block layer request cmd_flags * @buffer: data buffer * @bufflen: len of buffer * @timeout: request timeout in HZ * @ml_retries: number of times SCSI midlayer will retry request * @args: Optional args. See struct definition for field descriptions * * Returns the scsi_cmnd result field if a command was executed, or a negative * Linux error code if we didn't get that far. */ int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd, blk_opf_t opf, void *buffer, unsigned int bufflen, int timeout, int ml_retries, const struct scsi_exec_args *args) { … } EXPORT_SYMBOL(…); /* * Wake up the error handler if necessary. Avoid as follows that the error * handler is not woken up if host in-flight requests number == * shost->host_failed: use call_rcu() in scsi_eh_scmd_add() in combination * with an RCU read lock in this function to ensure that this function in * its entirety either finishes before scsi_eh_scmd_add() increases the * host_failed counter or that it notices the shost state change made by * scsi_eh_scmd_add(). */ static void scsi_dec_host_busy(struct Scsi_Host *shost, struct scsi_cmnd *cmd) { … } void scsi_device_unbusy(struct scsi_device *sdev, struct scsi_cmnd *cmd) { … } /* * Kick the queue of SCSI device @sdev if @sdev != current_sdev. Called with * interrupts disabled. */ static void scsi_kick_sdev_queue(struct scsi_device *sdev, void *data) { … } /* * Called for single_lun devices on IO completion. Clear starget_sdev_user, * and call blk_run_queue for all the scsi_devices on the target - * including current_sdev first. * * Called with *no* scsi locks held. */ static void scsi_single_lun_run(struct scsi_device *current_sdev) { … } static inline bool scsi_device_is_busy(struct scsi_device *sdev) { … } static inline bool scsi_target_is_busy(struct scsi_target *starget) { … } static inline bool scsi_host_is_busy(struct Scsi_Host *shost) { … } static void scsi_starved_list_run(struct Scsi_Host *shost) { … } /** * scsi_run_queue - Select a proper request queue to serve next. * @q: last request's queue * * The previous command was completely finished, start a new one if possible. */ static void scsi_run_queue(struct request_queue *q) { … } void scsi_requeue_run_queue(struct work_struct *work) { … } void scsi_run_host_queues(struct Scsi_Host *shost) { … } static void scsi_uninit_cmd(struct scsi_cmnd *cmd) { … } void scsi_free_sgtables(struct scsi_cmnd *cmd) { … } EXPORT_SYMBOL_GPL(…); static void scsi_mq_uninit_cmd(struct scsi_cmnd *cmd) { … } static void scsi_run_queue_async(struct scsi_device *sdev) { … } /* Returns false when no more bytes to process, true if there are more */ static bool scsi_end_request(struct request *req, blk_status_t error, unsigned int bytes) { … } /** * scsi_result_to_blk_status - translate a SCSI result code into blk_status_t * @result: scsi error code * * Translate a SCSI result code into a blk_status_t value. */ static blk_status_t scsi_result_to_blk_status(int result) { … } /** * scsi_rq_err_bytes - determine number of bytes till the next failure boundary * @rq: request to examine * * Description: * A request could be merge of IOs which require different failure * handling. This function determines the number of bytes which * can be failed from the beginning of the request without * crossing into area which need to be retried further. * * Return: * The number of bytes to fail. */ static unsigned int scsi_rq_err_bytes(const struct request *rq) { … } static bool scsi_cmd_runtime_exceeced(struct scsi_cmnd *cmd) { … } /* * When ALUA transition state is returned, reprep the cmd to * use the ALUA handler's transition timeout. Delay the reprep * 1 sec to avoid aggressive retries of the target in that * state. */ #define ALUA_TRANSITION_REPREP_DELAY … /* Helper for scsi_io_completion() when special action required. */ static void scsi_io_completion_action(struct scsi_cmnd *cmd, int result) { … } /* * Helper for scsi_io_completion() when cmd->result is non-zero. Returns a * new result that may suppress further error checking. Also modifies * *blk_statp in some cases. */ static int scsi_io_completion_nz_result(struct scsi_cmnd *cmd, int result, blk_status_t *blk_statp) { … } /** * scsi_io_completion - Completion processing for SCSI commands. * @cmd: command that is finished. * @good_bytes: number of processed bytes. * * We will finish off the specified number of sectors. If we are done, the * command block will be released and the queue function will be goosed. If we * are not done then we have to figure out what to do next: * * a) We can call scsi_mq_requeue_cmd(). The request will be * unprepared and put back on the queue. Then a new command will * be created for it. This should be used if we made forward * progress, or if we want to switch from READ(10) to READ(6) for * example. * * b) We can call scsi_io_completion_action(). The request will be * put back on the queue and retried using the same command as * before, possibly after a delay. * * c) We can call scsi_end_request() with blk_stat other than * BLK_STS_OK, to fail the remainder of the request. */ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) { … } static inline bool scsi_cmd_needs_dma_drain(struct scsi_device *sdev, struct request *rq) { … } /** * scsi_alloc_sgtables - Allocate and initialize data and integrity scatterlists * @cmd: SCSI command data structure to initialize. * * Initializes @cmd->sdb and also @cmd->prot_sdb if data integrity is enabled * for @cmd. * * Returns: * * BLK_STS_OK - on success * * BLK_STS_RESOURCE - if the failure is retryable * * BLK_STS_IOERR - if the failure is fatal */ blk_status_t scsi_alloc_sgtables(struct scsi_cmnd *cmd) { … } EXPORT_SYMBOL(…); /** * scsi_initialize_rq - initialize struct scsi_cmnd partially * @rq: Request associated with the SCSI command to be initialized. * * This function initializes the members of struct scsi_cmnd that must be * initialized before request processing starts and that won't be * reinitialized if a SCSI command is requeued. */ static void scsi_initialize_rq(struct request *rq) { … } struct request *scsi_alloc_request(struct request_queue *q, blk_opf_t opf, blk_mq_req_flags_t flags) { … } EXPORT_SYMBOL_GPL(…); /* * Only called when the request isn't completed by SCSI, and not freed by * SCSI */ static void scsi_cleanup_rq(struct request *rq) { … } /* Called before a request is prepared. See also scsi_mq_prep_fn(). */ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd) { … } static blk_status_t scsi_setup_scsi_cmnd(struct scsi_device *sdev, struct request *req) { … } static blk_status_t scsi_device_state_check(struct scsi_device *sdev, struct request *req) { … } /* * scsi_dev_queue_ready: if we can send requests to sdev, assign one token * and return the token else return -1. */ static inline int scsi_dev_queue_ready(struct request_queue *q, struct scsi_device *sdev) { … } /* * scsi_target_queue_ready: checks if there we can send commands to target * @sdev: scsi device on starget to check. */ static inline int scsi_target_queue_ready(struct Scsi_Host *shost, struct scsi_device *sdev) { … } /* * scsi_host_queue_ready: if we can send requests to shost, return 1 else * return 0. We must end up running the queue again whenever 0 is * returned, else IO can hang. */ static inline int scsi_host_queue_ready(struct request_queue *q, struct Scsi_Host *shost, struct scsi_device *sdev, struct scsi_cmnd *cmd) { … } /* * Busy state exporting function for request stacking drivers. * * For efficiency, no lock is taken to check the busy state of * shost/starget/sdev, since the returned value is not guaranteed and * may be changed after request stacking drivers call the function, * regardless of taking lock or not. * * When scsi can't dispatch I/Os anymore and needs to kill I/Os scsi * needs to return 'not busy'. Otherwise, request stacking drivers * may hold requests forever. */ static bool scsi_mq_lld_busy(struct request_queue *q) { … } /* * Block layer request completion callback. May be called from interrupt * context. */ static void scsi_complete(struct request *rq) { … } /** * scsi_dispatch_cmd - Dispatch a command to the low-level driver. * @cmd: command block we are dispatching. * * Return: nonzero return request was rejected and device's queue needs to be * plugged. */ static int scsi_dispatch_cmd(struct scsi_cmnd *cmd) { … } /* Size in bytes of the sg-list stored in the scsi-mq command-private data. */ static unsigned int scsi_mq_inline_sgl_size(struct Scsi_Host *shost) { … } static blk_status_t scsi_prepare_cmd(struct request *req) { … } static void scsi_done_internal(struct scsi_cmnd *cmd, bool complete_directly) { … } void scsi_done(struct scsi_cmnd *cmd) { … } EXPORT_SYMBOL(…); void scsi_done_direct(struct scsi_cmnd *cmd) { … } EXPORT_SYMBOL(…); static void scsi_mq_put_budget(struct request_queue *q, int budget_token) { … } /* * When to reinvoke queueing after a resource shortage. It's 3 msecs to * not change behaviour from the previous unplug mechanism, experimentation * may prove this needs changing. */ #define SCSI_QUEUE_DELAY … static int scsi_mq_get_budget(struct request_queue *q) { … } static void scsi_mq_set_rq_budget_token(struct request *req, int token) { … } static int scsi_mq_get_rq_budget_token(struct request *req) { … } static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx, const struct blk_mq_queue_data *bd) { … } static int scsi_mq_init_request(struct blk_mq_tag_set *set, struct request *rq, unsigned int hctx_idx, unsigned int numa_node) { … } static void scsi_mq_exit_request(struct blk_mq_tag_set *set, struct request *rq, unsigned int hctx_idx) { … } static int scsi_mq_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob) { … } static int scsi_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, unsigned int hctx_idx) { … } static void scsi_map_queues(struct blk_mq_tag_set *set) { … } void scsi_init_limits(struct Scsi_Host *shost, struct queue_limits *lim) { … } EXPORT_SYMBOL_GPL(…); static const struct blk_mq_ops scsi_mq_ops_no_commit = …; static void scsi_commit_rqs(struct blk_mq_hw_ctx *hctx) { … } static const struct blk_mq_ops scsi_mq_ops = …; int scsi_mq_setup_tags(struct Scsi_Host *shost) { … } void scsi_mq_free_tags(struct kref *kref) { … } /** * scsi_device_from_queue - return sdev associated with a request_queue * @q: The request queue to return the sdev from * * Return the sdev associated with a request queue or NULL if the * request_queue does not reference a SCSI device. */ struct scsi_device *scsi_device_from_queue(struct request_queue *q) { … } /* * pktcdvd should have been integrated into the SCSI layers, but for historical * reasons like the old IDE driver it isn't. This export allows it to safely * probe if a given device is a SCSI one and only attach to that. */ #ifdef CONFIG_CDROM_PKTCDVD_MODULE EXPORT_SYMBOL_GPL(scsi_device_from_queue); #endif /** * scsi_block_requests - Utility function used by low-level drivers to prevent * further commands from being queued to the device. * @shost: host in question * * There is no timer nor any other means by which the requests get unblocked * other than the low-level driver calling scsi_unblock_requests(). */ void scsi_block_requests(struct Scsi_Host *shost) { … } EXPORT_SYMBOL(…); /** * scsi_unblock_requests - Utility function used by low-level drivers to allow * further commands to be queued to the device. * @shost: host in question * * There is no timer nor any other means by which the requests get unblocked * other than the low-level driver calling scsi_unblock_requests(). This is done * as an API function so that changes to the internals of the scsi mid-layer * won't require wholesale changes to drivers that use this feature. */ void scsi_unblock_requests(struct Scsi_Host *shost) { … } EXPORT_SYMBOL(…); void scsi_exit_queue(void) { … } /** * scsi_mode_select - issue a mode select * @sdev: SCSI device to be queried * @pf: Page format bit (1 == standard, 0 == vendor specific) * @sp: Save page bit (0 == don't save, 1 == save) * @buffer: request buffer (may not be smaller than eight bytes) * @len: length of request buffer. * @timeout: command timeout * @retries: number of retries before failing * @data: returns a structure abstracting the mode header data * @sshdr: place to put sense data (or NULL if no sense to be collected). * must be SCSI_SENSE_BUFFERSIZE big. * * Returns zero if successful; negative error number or scsi * status on error * */ int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, unsigned char *buffer, int len, int timeout, int retries, struct scsi_mode_data *data, struct scsi_sense_hdr *sshdr) { … } EXPORT_SYMBOL_GPL(…); /** * scsi_mode_sense - issue a mode sense, falling back from 10 to six bytes if necessary. * @sdev: SCSI device to be queried * @dbd: set to prevent mode sense from returning block descriptors * @modepage: mode page being requested * @subpage: sub-page of the mode page being requested * @buffer: request buffer (may not be smaller than eight bytes) * @len: length of request buffer. * @timeout: command timeout * @retries: number of retries before failing * @data: returns a structure abstracting the mode header data * @sshdr: place to put sense data (or NULL if no sense to be collected). * must be SCSI_SENSE_BUFFERSIZE big. * * Returns zero if successful, or a negative error number on failure */ int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, int subpage, unsigned char *buffer, int len, int timeout, int retries, struct scsi_mode_data *data, struct scsi_sense_hdr *sshdr) { … } EXPORT_SYMBOL(…); /** * scsi_test_unit_ready - test if unit is ready * @sdev: scsi device to change the state of. * @timeout: command timeout * @retries: number of retries before failing * @sshdr: outpout pointer for decoded sense information. * * Returns zero if unsuccessful or an error if TUR failed. For * removable media, UNIT_ATTENTION sets ->changed flag. **/ int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, int retries, struct scsi_sense_hdr *sshdr) { … } EXPORT_SYMBOL(…); /** * scsi_device_set_state - Take the given device through the device state model. * @sdev: scsi device to change the state of. * @state: state to change to. * * Returns zero if successful or an error if the requested * transition is illegal. */ int scsi_device_set_state(struct scsi_device *sdev, enum scsi_device_state state) { … } EXPORT_SYMBOL(…); /** * scsi_evt_emit - emit a single SCSI device uevent * @sdev: associated SCSI device * @evt: event to emit * * Send a single uevent (scsi_event) to the associated scsi_device. */ static void scsi_evt_emit(struct scsi_device *sdev, struct scsi_event *evt) { … } /** * scsi_evt_thread - send a uevent for each scsi event * @work: work struct for scsi_device * * Dispatch queued events to their associated scsi_device kobjects * as uevents. */ void scsi_evt_thread(struct work_struct *work) { … } /** * sdev_evt_send - send asserted event to uevent thread * @sdev: scsi_device event occurred on * @evt: event to send * * Assert scsi device event asynchronously. */ void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt) { … } EXPORT_SYMBOL_GPL(…); /** * sdev_evt_alloc - allocate a new scsi event * @evt_type: type of event to allocate * @gfpflags: GFP flags for allocation * * Allocates and returns a new scsi_event. */ struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, gfp_t gfpflags) { … } EXPORT_SYMBOL_GPL(…); /** * sdev_evt_send_simple - send asserted event to uevent thread * @sdev: scsi_device event occurred on * @evt_type: type of event to send * @gfpflags: GFP flags for allocation * * Assert scsi device event asynchronously, given an event type. */ void sdev_evt_send_simple(struct scsi_device *sdev, enum scsi_device_event evt_type, gfp_t gfpflags) { … } EXPORT_SYMBOL_GPL(…); /** * scsi_device_quiesce - Block all commands except power management. * @sdev: scsi device to quiesce. * * This works by trying to transition to the SDEV_QUIESCE state * (which must be a legal transition). When the device is in this * state, only power management requests will be accepted, all others will * be deferred. * * Must be called with user context, may sleep. * * Returns zero if unsuccessful or an error if not. */ int scsi_device_quiesce(struct scsi_device *sdev) { … } EXPORT_SYMBOL(…); /** * scsi_device_resume - Restart user issued commands to a quiesced device. * @sdev: scsi device to resume. * * Moves the device from quiesced back to running and restarts the * queues. * * Must be called with user context, may sleep. */ void scsi_device_resume(struct scsi_device *sdev) { … } EXPORT_SYMBOL(…); static void device_quiesce_fn(struct scsi_device *sdev, void *data) { … } void scsi_target_quiesce(struct scsi_target *starget) { … } EXPORT_SYMBOL(…); static void device_resume_fn(struct scsi_device *sdev, void *data) { … } void scsi_target_resume(struct scsi_target *starget) { … } EXPORT_SYMBOL(…); static int __scsi_internal_device_block_nowait(struct scsi_device *sdev) { … } void scsi_start_queue(struct scsi_device *sdev) { … } static void scsi_stop_queue(struct scsi_device *sdev) { … } /** * scsi_internal_device_block_nowait - try to transition to the SDEV_BLOCK state * @sdev: device to block * * Pause SCSI command processing on the specified device. Does not sleep. * * Returns zero if successful or a negative error code upon failure. * * Notes: * This routine transitions the device to the SDEV_BLOCK state (which must be * a legal transition). When the device is in this state, command processing * is paused until the device leaves the SDEV_BLOCK state. See also * scsi_internal_device_unblock_nowait(). */ int scsi_internal_device_block_nowait(struct scsi_device *sdev) { … } EXPORT_SYMBOL_GPL(…); /** * scsi_device_block - try to transition to the SDEV_BLOCK state * @sdev: device to block * @data: dummy argument, ignored * * Pause SCSI command processing on the specified device. Callers must wait * until all ongoing scsi_queue_rq() calls have finished after this function * returns. * * Note: * This routine transitions the device to the SDEV_BLOCK state (which must be * a legal transition). When the device is in this state, command processing * is paused until the device leaves the SDEV_BLOCK state. See also * scsi_internal_device_unblock(). */ static void scsi_device_block(struct scsi_device *sdev, void *data) { … } /** * scsi_internal_device_unblock_nowait - resume a device after a block request * @sdev: device to resume * @new_state: state to set the device to after unblocking * * Restart the device queue for a previously suspended SCSI device. Does not * sleep. * * Returns zero if successful or a negative error code upon failure. * * Notes: * This routine transitions the device to the SDEV_RUNNING state or to one of * the offline states (which must be a legal transition) allowing the midlayer * to goose the queue for this device. */ int scsi_internal_device_unblock_nowait(struct scsi_device *sdev, enum scsi_device_state new_state) { … } EXPORT_SYMBOL_GPL(…); /** * scsi_internal_device_unblock - resume a device after a block request * @sdev: device to resume * @new_state: state to set the device to after unblocking * * Restart the device queue for a previously suspended SCSI device. May sleep. * * Returns zero if successful or a negative error code upon failure. * * Notes: * This routine transitions the device to the SDEV_RUNNING state or to one of * the offline states (which must be a legal transition) allowing the midlayer * to goose the queue for this device. */ static int scsi_internal_device_unblock(struct scsi_device *sdev, enum scsi_device_state new_state) { … } static int target_block(struct device *dev, void *data) { … } /** * scsi_block_targets - transition all SCSI child devices to SDEV_BLOCK state * @dev: a parent device of one or more scsi_target devices * @shost: the Scsi_Host to which this device belongs * * Iterate over all children of @dev, which should be scsi_target devices, * and switch all subordinate scsi devices to SDEV_BLOCK state. Wait for * ongoing scsi_queue_rq() calls to finish. May sleep. * * Note: * @dev must not itself be a scsi_target device. */ void scsi_block_targets(struct Scsi_Host *shost, struct device *dev) { … } EXPORT_SYMBOL_GPL(…); static void device_unblock(struct scsi_device *sdev, void *data) { … } static int target_unblock(struct device *dev, void *data) { … } void scsi_target_unblock(struct device *dev, enum scsi_device_state new_state) { … } EXPORT_SYMBOL_GPL(…); /** * scsi_host_block - Try to transition all logical units to the SDEV_BLOCK state * @shost: device to block * * Pause SCSI command processing for all logical units associated with the SCSI * host and wait until pending scsi_queue_rq() calls have finished. * * Returns zero if successful or a negative error code upon failure. */ int scsi_host_block(struct Scsi_Host *shost) { … } EXPORT_SYMBOL_GPL(…); int scsi_host_unblock(struct Scsi_Host *shost, int new_state) { … } EXPORT_SYMBOL_GPL(…); /** * scsi_kmap_atomic_sg - find and atomically map an sg-elemnt * @sgl: scatter-gather list * @sg_count: number of segments in sg * @offset: offset in bytes into sg, on return offset into the mapped area * @len: bytes to map, on return number of bytes mapped * * Returns virtual address of the start of the mapped page */ void *scsi_kmap_atomic_sg(struct scatterlist *sgl, int sg_count, size_t *offset, size_t *len) { … } EXPORT_SYMBOL(…); /** * scsi_kunmap_atomic_sg - atomically unmap a virtual address, previously mapped with scsi_kmap_atomic_sg * @virt: virtual address to be unmapped */ void scsi_kunmap_atomic_sg(void *virt) { … } EXPORT_SYMBOL(…); void sdev_disable_disk_events(struct scsi_device *sdev) { … } EXPORT_SYMBOL(…); void sdev_enable_disk_events(struct scsi_device *sdev) { … } EXPORT_SYMBOL(…); static unsigned char designator_prio(const unsigned char *d) { … } /** * scsi_vpd_lun_id - return a unique device identification * @sdev: SCSI device * @id: buffer for the identification * @id_len: length of the buffer * * Copies a unique device identification into @id based * on the information in the VPD page 0x83 of the device. * The string will be formatted as a SCSI name string. * * Returns the length of the identification or error on failure. * If the identifier is longer than the supplied buffer the actual * identifier length is returned and the buffer is not zero-padded. */ int scsi_vpd_lun_id(struct scsi_device *sdev, char *id, size_t id_len) { … } EXPORT_SYMBOL(…); /* * scsi_vpd_tpg_id - return a target port group identifier * @sdev: SCSI device * * Returns the Target Port Group identifier from the information * froom VPD page 0x83 of the device. * * Returns the identifier or error on failure. */ int scsi_vpd_tpg_id(struct scsi_device *sdev, int *rel_id) { … } EXPORT_SYMBOL(…); /** * scsi_build_sense - build sense data for a command * @scmd: scsi command for which the sense should be formatted * @desc: Sense format (non-zero == descriptor format, * 0 == fixed format) * @key: Sense key * @asc: Additional sense code * @ascq: Additional sense code qualifier * **/ void scsi_build_sense(struct scsi_cmnd *scmd, int desc, u8 key, u8 asc, u8 ascq) { … } EXPORT_SYMBOL_GPL(…); #ifdef CONFIG_SCSI_LIB_KUNIT_TEST #include "scsi_lib_test.c" #endif
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