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scsi: target: Add block PR support to iblock
This adds support for the block PR callouts to target_core_iblock. This patch doesn't attempt to implement the entire spec because there's no way support it all like SPEC_I_PT and ALL_TG_PT. This only supports exporting the iblock device from one path on the local target. Signed-off-by: Mike Christie <michael.christie@oracle.com> Link: https://lore.kernel.org/r/20230407200551.12660-19-michael.christie@oracle.com Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie
Martin K. Petersen
parent
8455799d2d
commit
394f811848
@ -23,13 +23,16 @@
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#include <linux/file.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <linux/pr.h>
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#include <scsi/scsi_proto.h>
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#include <scsi/scsi_common.h>
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#include <asm/unaligned.h>
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#include <target/target_core_base.h>
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#include <target/target_core_backend.h>
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#include "target_core_iblock.h"
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#include "target_core_pr.h"
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#define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */
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#define IBLOCK_BIO_POOL_SIZE 128
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@ -310,7 +313,7 @@ static sector_t iblock_get_blocks(struct se_device *dev)
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return blocks_long;
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}
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static void iblock_complete_cmd(struct se_cmd *cmd)
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static void iblock_complete_cmd(struct se_cmd *cmd, blk_status_t blk_status)
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{
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struct iblock_req *ibr = cmd->priv;
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u8 status;
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@ -318,7 +321,9 @@ static void iblock_complete_cmd(struct se_cmd *cmd)
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if (!refcount_dec_and_test(&ibr->pending))
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return;
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if (atomic_read(&ibr->ib_bio_err_cnt))
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if (blk_status == BLK_STS_RESV_CONFLICT)
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status = SAM_STAT_RESERVATION_CONFLICT;
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else if (atomic_read(&ibr->ib_bio_err_cnt))
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status = SAM_STAT_CHECK_CONDITION;
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else
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status = SAM_STAT_GOOD;
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@ -331,6 +336,7 @@ static void iblock_bio_done(struct bio *bio)
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{
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struct se_cmd *cmd = bio->bi_private;
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struct iblock_req *ibr = cmd->priv;
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blk_status_t blk_status = bio->bi_status;
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if (bio->bi_status) {
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pr_err("bio error: %p, err: %d\n", bio, bio->bi_status);
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@ -343,7 +349,7 @@ static void iblock_bio_done(struct bio *bio)
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bio_put(bio);
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iblock_complete_cmd(cmd);
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iblock_complete_cmd(cmd, blk_status);
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}
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static struct bio *iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num,
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@ -759,7 +765,7 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
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if (!sgl_nents) {
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refcount_set(&ibr->pending, 1);
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iblock_complete_cmd(cmd);
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iblock_complete_cmd(cmd, BLK_STS_OK);
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return 0;
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}
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@ -817,7 +823,7 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
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}
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iblock_submit_bios(&list);
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iblock_complete_cmd(cmd);
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iblock_complete_cmd(cmd, BLK_STS_OK);
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return 0;
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fail_put_bios:
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@ -829,6 +835,258 @@ fail:
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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}
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static sense_reason_t iblock_execute_pr_out(struct se_cmd *cmd, u8 sa, u64 key,
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u64 sa_key, u8 type, bool aptpl)
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{
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struct se_device *dev = cmd->se_dev;
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struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
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struct block_device *bdev = ib_dev->ibd_bd;
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const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
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int ret;
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if (!ops) {
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pr_err("Block device does not support pr_ops but iblock device has been configured for PR passthrough.\n");
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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}
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switch (sa) {
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case PRO_REGISTER:
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case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
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if (!ops->pr_register) {
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pr_err("block device does not support pr_register.\n");
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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}
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/* The block layer pr ops always enables aptpl */
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if (!aptpl)
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pr_info("APTPL not set by initiator, but will be used.\n");
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ret = ops->pr_register(bdev, key, sa_key,
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sa == PRO_REGISTER ? 0 : PR_FL_IGNORE_KEY);
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break;
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case PRO_RESERVE:
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if (!ops->pr_reserve) {
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pr_err("block_device does not support pr_reserve.\n");
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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}
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ret = ops->pr_reserve(bdev, key, scsi_pr_type_to_block(type), 0);
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break;
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case PRO_CLEAR:
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if (!ops->pr_clear) {
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pr_err("block_device does not support pr_clear.\n");
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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}
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ret = ops->pr_clear(bdev, key);
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break;
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case PRO_PREEMPT:
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case PRO_PREEMPT_AND_ABORT:
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if (!ops->pr_clear) {
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pr_err("block_device does not support pr_preempt.\n");
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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}
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ret = ops->pr_preempt(bdev, key, sa_key,
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scsi_pr_type_to_block(type),
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sa == PRO_PREEMPT ? false : true);
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break;
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case PRO_RELEASE:
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if (!ops->pr_clear) {
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pr_err("block_device does not support pr_pclear.\n");
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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}
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ret = ops->pr_release(bdev, key, scsi_pr_type_to_block(type));
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break;
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default:
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pr_err("Unknown PERSISTENT_RESERVE_OUT SA: 0x%02x\n", sa);
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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}
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if (!ret)
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return TCM_NO_SENSE;
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else if (ret == PR_STS_RESERVATION_CONFLICT)
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return TCM_RESERVATION_CONFLICT;
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else
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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}
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static void iblock_pr_report_caps(unsigned char *param_data)
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{
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u16 len = 8;
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put_unaligned_be16(len, ¶m_data[0]);
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/*
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* When using the pr_ops passthrough method we only support exporting
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* the device through one target port because from the backend module
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* level we can't see the target port config. As a result we only
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* support registration directly from the I_T nexus the cmd is sent
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* through and do not set ATP_C here.
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*
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* The block layer pr_ops do not support passing in initiators so
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* we don't set SIP_C here.
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*/
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/* PTPL_C: Persistence across Target Power Loss bit */
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param_data[2] |= 0x01;
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/*
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* We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
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* set the TMV: Task Mask Valid bit.
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*/
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param_data[3] |= 0x80;
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/*
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* Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
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*/
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param_data[3] |= 0x10; /* ALLOW COMMANDs field 001b */
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/*
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* PTPL_A: Persistence across Target Power Loss Active bit. The block
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* layer pr ops always enables this so report it active.
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*/
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param_data[3] |= 0x01;
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/*
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* Setup the PERSISTENT RESERVATION TYPE MASK from Table 212 spc4r37.
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*/
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param_data[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
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param_data[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
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param_data[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
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param_data[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
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param_data[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
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param_data[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
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}
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static sense_reason_t iblock_pr_read_keys(struct se_cmd *cmd,
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unsigned char *param_data)
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{
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struct se_device *dev = cmd->se_dev;
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struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
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struct block_device *bdev = ib_dev->ibd_bd;
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const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
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int i, len, paths, data_offset;
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struct pr_keys *keys;
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sense_reason_t ret;
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if (!ops) {
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pr_err("Block device does not support pr_ops but iblock device has been configured for PR passthrough.\n");
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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}
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if (!ops->pr_read_keys) {
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pr_err("Block device does not support read_keys.\n");
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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}
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/*
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* We don't know what's under us, but dm-multipath will register every
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* path with the same key, so start off with enough space for 16 paths.
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* which is not a lot of memory and should normally be enough.
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*/
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paths = 16;
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retry:
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len = 8 * paths;
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keys = kzalloc(sizeof(*keys) + len, GFP_KERNEL);
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if (!keys)
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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keys->num_keys = paths;
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if (!ops->pr_read_keys(bdev, keys)) {
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if (keys->num_keys > paths) {
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kfree(keys);
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paths *= 2;
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goto retry;
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}
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} else {
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ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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goto free_keys;
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}
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ret = TCM_NO_SENSE;
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put_unaligned_be32(keys->generation, ¶m_data[0]);
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if (!keys->num_keys) {
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put_unaligned_be32(0, ¶m_data[4]);
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goto free_keys;
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}
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put_unaligned_be32(8 * keys->num_keys, ¶m_data[4]);
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data_offset = 8;
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for (i = 0; i < keys->num_keys; i++) {
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if (data_offset + 8 > cmd->data_length)
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break;
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put_unaligned_be64(keys->keys[i], ¶m_data[data_offset]);
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data_offset += 8;
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}
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free_keys:
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kfree(keys);
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return ret;
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}
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static sense_reason_t iblock_pr_read_reservation(struct se_cmd *cmd,
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unsigned char *param_data)
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{
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struct se_device *dev = cmd->se_dev;
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struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
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struct block_device *bdev = ib_dev->ibd_bd;
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const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
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struct pr_held_reservation rsv = { };
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if (!ops) {
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pr_err("Block device does not support pr_ops but iblock device has been configured for PR passthrough.\n");
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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}
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if (!ops->pr_read_reservation) {
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pr_err("Block device does not support read_keys.\n");
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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}
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if (ops->pr_read_reservation(bdev, &rsv))
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return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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put_unaligned_be32(rsv.generation, ¶m_data[0]);
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if (!block_pr_type_to_scsi(rsv.type)) {
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put_unaligned_be32(0, ¶m_data[4]);
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return TCM_NO_SENSE;
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}
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put_unaligned_be32(16, ¶m_data[4]);
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if (cmd->data_length < 16)
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return TCM_NO_SENSE;
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put_unaligned_be64(rsv.key, ¶m_data[8]);
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if (cmd->data_length < 22)
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return TCM_NO_SENSE;
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param_data[21] = block_pr_type_to_scsi(rsv.type);
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return TCM_NO_SENSE;
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}
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static sense_reason_t iblock_execute_pr_in(struct se_cmd *cmd, u8 sa,
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unsigned char *param_data)
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{
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sense_reason_t ret = TCM_NO_SENSE;
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switch (sa) {
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case PRI_REPORT_CAPABILITIES:
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iblock_pr_report_caps(param_data);
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break;
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case PRI_READ_KEYS:
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ret = iblock_pr_read_keys(cmd, param_data);
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break;
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case PRI_READ_RESERVATION:
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ret = iblock_pr_read_reservation(cmd, param_data);
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break;
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default:
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pr_err("Unknown PERSISTENT_RESERVE_IN SA: 0x%02x\n", sa);
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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}
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return ret;
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}
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static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev)
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{
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struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
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@ -874,6 +1132,8 @@ static struct exec_cmd_ops iblock_exec_cmd_ops = {
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.execute_sync_cache = iblock_execute_sync_cache,
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.execute_write_same = iblock_execute_write_same,
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.execute_unmap = iblock_execute_unmap,
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.execute_pr_out = iblock_execute_pr_out,
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.execute_pr_in = iblock_execute_pr_in,
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};
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static sense_reason_t
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@ -890,6 +1150,7 @@ static bool iblock_get_write_cache(struct se_device *dev)
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static const struct target_backend_ops iblock_ops = {
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.name = "iblock",
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.inquiry_prod = "IBLOCK",
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.transport_flags_changeable = TRANSPORT_FLAG_PASSTHROUGH_PGR,
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.inquiry_rev = IBLOCK_VERSION,
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.owner = THIS_MODULE,
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.attach_hba = iblock_attach_hba,
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