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29a05deebf
This patch converts se_node_acl->device_list[] table for mappedluns to modern RCU hlist_head usage in order to support an arbitrary number of node_acl lun mappings. It converts transport_lookup_*_lun() fast-path code to use RCU read path primitives when looking up se_dev_entry. It adds a new hlist_head at se_node_acl->lun_entry_hlist for this purpose. For transport_lookup_cmd_lun() code, it works with existing per-cpu se_lun->lun_ref when associating se_cmd with se_lun + se_device. Also, go ahead and update core_create_device_list_for_node() + core_free_device_list_for_node() to use ->lun_entry_hlist. It also converts se_dev_entry->pr_ref_count access to use modern struct kref counting, and updates core_disable_device_list_for_node() to kref_put() and block on se_deve->pr_comp waiting for outstanding PR special-case PR references to drop, then invoke kfree_rcu() to wait for the RCU grace period to complete before releasing memory. So now that se_node_acl->lun_entry_hlist fast path access uses RCU protected pointers, go ahead and convert remaining non-fast path RCU updater code using ->lun_entry_lock to struct mutex to allow callers to block while walking se_node_acl->lun_entry_hlist. Finally drop the left-over core_clear_initiator_node_from_tpg() that originally cleared lun_access during se_node_acl shutdown, as post RCU conversion it now becomes duplicated logic. Reviewed-by: Hannes Reinecke <hare@suse.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
141 lines
5.8 KiB
C
141 lines
5.8 KiB
C
#ifndef TARGET_CORE_BACKEND_H
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#define TARGET_CORE_BACKEND_H
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#define TRANSPORT_FLAG_PASSTHROUGH 1
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struct target_backend_cits {
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struct config_item_type tb_dev_cit;
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struct config_item_type tb_dev_attrib_cit;
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struct config_item_type tb_dev_pr_cit;
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struct config_item_type tb_dev_wwn_cit;
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struct config_item_type tb_dev_alua_tg_pt_gps_cit;
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struct config_item_type tb_dev_stat_cit;
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};
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struct se_subsystem_api {
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struct list_head sub_api_list;
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char name[16];
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char inquiry_prod[16];
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char inquiry_rev[4];
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struct module *owner;
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u8 transport_flags;
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int (*attach_hba)(struct se_hba *, u32);
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void (*detach_hba)(struct se_hba *);
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int (*pmode_enable_hba)(struct se_hba *, unsigned long);
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struct se_device *(*alloc_device)(struct se_hba *, const char *);
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int (*configure_device)(struct se_device *);
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void (*free_device)(struct se_device *device);
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ssize_t (*set_configfs_dev_params)(struct se_device *,
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const char *, ssize_t);
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ssize_t (*show_configfs_dev_params)(struct se_device *, char *);
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void (*transport_complete)(struct se_cmd *cmd,
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struct scatterlist *,
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unsigned char *);
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sense_reason_t (*parse_cdb)(struct se_cmd *cmd);
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u32 (*get_device_type)(struct se_device *);
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sector_t (*get_blocks)(struct se_device *);
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sector_t (*get_alignment_offset_lbas)(struct se_device *);
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/* lbppbe = logical blocks per physical block exponent. see SBC-3 */
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unsigned int (*get_lbppbe)(struct se_device *);
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unsigned int (*get_io_min)(struct se_device *);
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unsigned int (*get_io_opt)(struct se_device *);
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unsigned char *(*get_sense_buffer)(struct se_cmd *);
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bool (*get_write_cache)(struct se_device *);
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int (*init_prot)(struct se_device *);
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int (*format_prot)(struct se_device *);
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void (*free_prot)(struct se_device *);
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struct target_backend_cits tb_cits;
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};
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struct sbc_ops {
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sense_reason_t (*execute_rw)(struct se_cmd *cmd, struct scatterlist *,
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u32, enum dma_data_direction);
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sense_reason_t (*execute_sync_cache)(struct se_cmd *cmd);
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sense_reason_t (*execute_write_same)(struct se_cmd *cmd);
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sense_reason_t (*execute_write_same_unmap)(struct se_cmd *cmd);
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sense_reason_t (*execute_unmap)(struct se_cmd *cmd);
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};
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int transport_subsystem_register(struct se_subsystem_api *);
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void transport_subsystem_release(struct se_subsystem_api *);
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void target_complete_cmd(struct se_cmd *, u8);
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void target_complete_cmd_with_length(struct se_cmd *, u8, int);
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sense_reason_t spc_parse_cdb(struct se_cmd *cmd, unsigned int *size);
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sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd);
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sense_reason_t spc_emulate_inquiry_std(struct se_cmd *, unsigned char *);
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sense_reason_t spc_emulate_evpd_83(struct se_cmd *, unsigned char *);
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sense_reason_t sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops);
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u32 sbc_get_device_rev(struct se_device *dev);
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u32 sbc_get_device_type(struct se_device *dev);
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sector_t sbc_get_write_same_sectors(struct se_cmd *cmd);
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sense_reason_t sbc_execute_unmap(struct se_cmd *cmd,
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sense_reason_t (*do_unmap_fn)(struct se_cmd *cmd, void *priv,
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sector_t lba, sector_t nolb),
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void *priv);
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void sbc_dif_generate(struct se_cmd *);
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sense_reason_t sbc_dif_verify(struct se_cmd *, sector_t, unsigned int,
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unsigned int, struct scatterlist *, int);
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void sbc_dif_copy_prot(struct se_cmd *, unsigned int, bool,
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struct scatterlist *, int);
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void transport_set_vpd_proto_id(struct t10_vpd *, unsigned char *);
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int transport_set_vpd_assoc(struct t10_vpd *, unsigned char *);
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int transport_set_vpd_ident_type(struct t10_vpd *, unsigned char *);
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int transport_set_vpd_ident(struct t10_vpd *, unsigned char *);
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/* core helpers also used by command snooping in pscsi */
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void *transport_kmap_data_sg(struct se_cmd *);
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void transport_kunmap_data_sg(struct se_cmd *);
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/* core helpers also used by xcopy during internal command setup */
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int target_alloc_sgl(struct scatterlist **, unsigned int *, u32, bool);
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sense_reason_t transport_generic_map_mem_to_cmd(struct se_cmd *,
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struct scatterlist *, u32, struct scatterlist *, u32);
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bool target_lun_is_rdonly(struct se_cmd *);
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/* From target_core_configfs.c to setup default backend config_item_types */
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void target_core_setup_sub_cits(struct se_subsystem_api *);
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/* attribute helpers from target_core_device.c for backend drivers */
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bool se_dev_check_wce(struct se_device *);
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int se_dev_set_max_unmap_lba_count(struct se_device *, u32);
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int se_dev_set_max_unmap_block_desc_count(struct se_device *, u32);
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int se_dev_set_unmap_granularity(struct se_device *, u32);
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int se_dev_set_unmap_granularity_alignment(struct se_device *, u32);
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int se_dev_set_max_write_same_len(struct se_device *, u32);
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int se_dev_set_emulate_model_alias(struct se_device *, int);
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int se_dev_set_emulate_dpo(struct se_device *, int);
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int se_dev_set_emulate_fua_write(struct se_device *, int);
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int se_dev_set_emulate_fua_read(struct se_device *, int);
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int se_dev_set_emulate_write_cache(struct se_device *, int);
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int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *, int);
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int se_dev_set_emulate_tas(struct se_device *, int);
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int se_dev_set_emulate_tpu(struct se_device *, int);
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int se_dev_set_emulate_tpws(struct se_device *, int);
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int se_dev_set_emulate_caw(struct se_device *, int);
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int se_dev_set_emulate_3pc(struct se_device *, int);
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int se_dev_set_pi_prot_type(struct se_device *, int);
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int se_dev_set_pi_prot_format(struct se_device *, int);
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int se_dev_set_enforce_pr_isids(struct se_device *, int);
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int se_dev_set_force_pr_aptpl(struct se_device *, int);
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int se_dev_set_is_nonrot(struct se_device *, int);
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int se_dev_set_emulate_rest_reord(struct se_device *dev, int);
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int se_dev_set_queue_depth(struct se_device *, u32);
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int se_dev_set_max_sectors(struct se_device *, u32);
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int se_dev_set_optimal_sectors(struct se_device *, u32);
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int se_dev_set_block_size(struct se_device *, u32);
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sense_reason_t passthrough_parse_cdb(struct se_cmd *cmd,
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sense_reason_t (*exec_cmd)(struct se_cmd *cmd));
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#endif /* TARGET_CORE_BACKEND_H */
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