8dc31ff929
This patch adds a new group of files that are to be used to have the kernel module execution some action. The next patch will have target_core_user use the group/files to be able to block a device and to reset its memory buffer used to pass commands between user/kernel space. This type of file is different from the existing device attributes in that they may be write only and when written to they result in the kernel module executing some function. These need to be separate from the normal device attributes which get/set device values so userspace can continue to loop over all the attribs and get/set them during initialization. Signed-off-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
124 lines
4.5 KiB
C
124 lines
4.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef TARGET_CORE_BACKEND_H
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#define TARGET_CORE_BACKEND_H
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#include <linux/types.h>
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#include <asm/unaligned.h>
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#include <target/target_core_base.h>
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#define TRANSPORT_FLAG_PASSTHROUGH 0x1
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/*
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* ALUA commands, state checks and setup operations are handled by the
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* backend module.
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*/
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#define TRANSPORT_FLAG_PASSTHROUGH_ALUA 0x2
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#define TRANSPORT_FLAG_PASSTHROUGH_PGR 0x4
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struct request_queue;
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struct scatterlist;
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struct target_backend_ops {
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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 (*destroy_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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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 configfs_attribute **tb_dev_attrib_attrs;
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struct configfs_attribute **tb_dev_action_attrs;
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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_unmap)(struct se_cmd *cmd,
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sector_t lba, sector_t nolb);
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};
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int transport_backend_register(const struct target_backend_ops *);
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void target_backend_unregister(const struct target_backend_ops *);
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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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void transport_copy_sense_to_cmd(struct se_cmd *, unsigned char *);
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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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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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extern struct configfs_attribute *sbc_attrib_attrs[];
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extern struct configfs_attribute *passthrough_attrib_attrs[];
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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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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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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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struct se_device *target_find_device(int id, bool do_depend);
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bool target_sense_desc_format(struct se_device *dev);
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sector_t target_to_linux_sector(struct se_device *dev, sector_t lb);
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bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
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struct request_queue *q);
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/* Only use get_unaligned_be24() if reading p - 1 is allowed. */
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static inline uint32_t get_unaligned_be24(const uint8_t *const p)
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{
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return get_unaligned_be32(p - 1) & 0xffffffU;
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}
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#endif /* TARGET_CORE_BACKEND_H */
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