| /******************************************************************************* |
| * Filename: target_core_iblock.c |
| * |
| * This file contains the Storage Engine <-> Linux BlockIO transport |
| * specific functions. |
| * |
| * (c) Copyright 2003-2013 Datera, Inc. |
| * |
| * Nicholas A. Bellinger <nab@kernel.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| * |
| ******************************************************************************/ |
| |
| #include <linux/string.h> |
| #include <linux/parser.h> |
| #include <linux/timer.h> |
| #include <linux/fs.h> |
| #include <linux/blkdev.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/bio.h> |
| #include <linux/genhd.h> |
| #include <linux/file.h> |
| #include <linux/module.h> |
| #include <scsi/scsi_proto.h> |
| #include <asm/unaligned.h> |
| |
| #include <target/target_core_base.h> |
| #include <target/target_core_backend.h> |
| |
| #include "target_core_iblock.h" |
| |
| #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ |
| #define IBLOCK_BIO_POOL_SIZE 128 |
| |
| static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) |
| { |
| return container_of(dev, struct iblock_dev, dev); |
| } |
| |
| |
| static int iblock_attach_hba(struct se_hba *hba, u32 host_id) |
| { |
| pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
| " Generic Target Core Stack %s\n", hba->hba_id, |
| IBLOCK_VERSION, TARGET_CORE_VERSION); |
| return 0; |
| } |
| |
| static void iblock_detach_hba(struct se_hba *hba) |
| { |
| } |
| |
| static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name) |
| { |
| struct iblock_dev *ib_dev = NULL; |
| |
| ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); |
| if (!ib_dev) { |
| pr_err("Unable to allocate struct iblock_dev\n"); |
| return NULL; |
| } |
| |
| pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
| |
| return &ib_dev->dev; |
| } |
| |
| static int iblock_configure_device(struct se_device *dev) |
| { |
| struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| struct request_queue *q; |
| struct block_device *bd = NULL; |
| struct blk_integrity *bi; |
| fmode_t mode; |
| int ret = -ENOMEM; |
| |
| if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
| pr_err("Missing udev_path= parameters for IBLOCK\n"); |
| return -EINVAL; |
| } |
| |
| ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0); |
| if (!ib_dev->ibd_bio_set) { |
| pr_err("IBLOCK: Unable to create bioset\n"); |
| goto out; |
| } |
| |
| pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
| ib_dev->ibd_udev_path); |
| |
| mode = FMODE_READ|FMODE_EXCL; |
| if (!ib_dev->ibd_readonly) |
| mode |= FMODE_WRITE; |
| else |
| dev->dev_flags |= DF_READ_ONLY; |
| |
| bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); |
| if (IS_ERR(bd)) { |
| ret = PTR_ERR(bd); |
| goto out_free_bioset; |
| } |
| ib_dev->ibd_bd = bd; |
| |
| q = bdev_get_queue(bd); |
| |
| dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); |
| dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q); |
| dev->dev_attrib.hw_queue_depth = q->nr_requests; |
| |
| if (target_configure_unmap_from_queue(&dev->dev_attrib, q, |
| dev->dev_attrib.hw_block_size)) |
| pr_debug("IBLOCK: BLOCK Discard support available," |
| " disabled by default\n"); |
| |
| /* |
| * Enable write same emulation for IBLOCK and use 0xFFFF as |
| * the smaller WRITE_SAME(10) only has a two-byte block count. |
| */ |
| dev->dev_attrib.max_write_same_len = 0xFFFF; |
| |
| if (blk_queue_nonrot(q)) |
| dev->dev_attrib.is_nonrot = 1; |
| |
| bi = bdev_get_integrity(bd); |
| if (bi) { |
| struct bio_set *bs = ib_dev->ibd_bio_set; |
| |
| if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-IP") || |
| !strcmp(bi->profile->name, "T10-DIF-TYPE1-IP")) { |
| pr_err("IBLOCK export of blk_integrity: %s not" |
| " supported\n", bi->profile->name); |
| ret = -ENOSYS; |
| goto out_blkdev_put; |
| } |
| |
| if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-CRC")) { |
| dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT; |
| } else if (!strcmp(bi->profile->name, "T10-DIF-TYPE1-CRC")) { |
| dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT; |
| } |
| |
| if (dev->dev_attrib.pi_prot_type) { |
| if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) { |
| pr_err("Unable to allocate bioset for PI\n"); |
| ret = -ENOMEM; |
| goto out_blkdev_put; |
| } |
| pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n", |
| bs->bio_integrity_pool); |
| } |
| dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type; |
| } |
| |
| return 0; |
| |
| out_blkdev_put: |
| blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); |
| out_free_bioset: |
| bioset_free(ib_dev->ibd_bio_set); |
| ib_dev->ibd_bio_set = NULL; |
| out: |
| return ret; |
| } |
| |
| static void iblock_dev_call_rcu(struct rcu_head *p) |
| { |
| struct se_device *dev = container_of(p, struct se_device, rcu_head); |
| struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| |
| kfree(ib_dev); |
| } |
| |
| static void iblock_free_device(struct se_device *dev) |
| { |
| struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| |
| if (ib_dev->ibd_bd != NULL) |
| blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); |
| if (ib_dev->ibd_bio_set != NULL) |
| bioset_free(ib_dev->ibd_bio_set); |
| |
| call_rcu(&dev->rcu_head, iblock_dev_call_rcu); |
| } |
| |
| static unsigned long long iblock_emulate_read_cap_with_block_size( |
| struct se_device *dev, |
| struct block_device *bd, |
| struct request_queue *q) |
| { |
| unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), |
| bdev_logical_block_size(bd)) - 1); |
| u32 block_size = bdev_logical_block_size(bd); |
| |
| if (block_size == dev->dev_attrib.block_size) |
| return blocks_long; |
| |
| switch (block_size) { |
| case 4096: |
| switch (dev->dev_attrib.block_size) { |
| case 2048: |
| blocks_long <<= 1; |
| break; |
| case 1024: |
| blocks_long <<= 2; |
| break; |
| case 512: |
| blocks_long <<= 3; |
| default: |
| break; |
| } |
| break; |
| case 2048: |
| switch (dev->dev_attrib.block_size) { |
| case 4096: |
| blocks_long >>= 1; |
| break; |
| case 1024: |
| blocks_long <<= 1; |
| break; |
| case 512: |
| blocks_long <<= 2; |
| break; |
| default: |
| break; |
| } |
| break; |
| case 1024: |
| switch (dev->dev_attrib.block_size) { |
| case 4096: |
| blocks_long >>= 2; |
| break; |
| case 2048: |
| blocks_long >>= 1; |
| break; |
| case 512: |
| blocks_long <<= 1; |
| break; |
| default: |
| break; |
| } |
| break; |
| case 512: |
| switch (dev->dev_attrib.block_size) { |
| case 4096: |
| blocks_long >>= 3; |
| break; |
| case 2048: |
| blocks_long >>= 2; |
| break; |
| case 1024: |
| blocks_long >>= 1; |
| break; |
| default: |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| |
| return blocks_long; |
| } |
| |
| static void iblock_complete_cmd(struct se_cmd *cmd) |
| { |
| struct iblock_req *ibr = cmd->priv; |
| u8 status; |
| |
| if (!atomic_dec_and_test(&ibr->pending)) |
| return; |
| |
| if (atomic_read(&ibr->ib_bio_err_cnt)) |
| status = SAM_STAT_CHECK_CONDITION; |
| else |
| status = SAM_STAT_GOOD; |
| |
| target_complete_cmd(cmd, status); |
| kfree(ibr); |
| } |
| |
| static void iblock_bio_done(struct bio *bio) |
| { |
| struct se_cmd *cmd = bio->bi_private; |
| struct iblock_req *ibr = cmd->priv; |
| |
| if (bio->bi_error) { |
| pr_err("bio error: %p, err: %d\n", bio, bio->bi_error); |
| /* |
| * Bump the ib_bio_err_cnt and release bio. |
| */ |
| atomic_inc(&ibr->ib_bio_err_cnt); |
| smp_mb__after_atomic(); |
| } |
| |
| bio_put(bio); |
| |
| iblock_complete_cmd(cmd); |
| } |
| |
| static struct bio * |
| iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num) |
| { |
| struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
| struct bio *bio; |
| |
| /* |
| * Only allocate as many vector entries as the bio code allows us to, |
| * we'll loop later on until we have handled the whole request. |
| */ |
| if (sg_num > BIO_MAX_PAGES) |
| sg_num = BIO_MAX_PAGES; |
| |
| bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); |
| if (!bio) { |
| pr_err("Unable to allocate memory for bio\n"); |
| return NULL; |
| } |
| |
| bio->bi_bdev = ib_dev->ibd_bd; |
| bio->bi_private = cmd; |
| bio->bi_end_io = &iblock_bio_done; |
| bio->bi_iter.bi_sector = lba; |
| |
| return bio; |
| } |
| |
| static void iblock_submit_bios(struct bio_list *list, int rw) |
| { |
| struct blk_plug plug; |
| struct bio *bio; |
| |
| blk_start_plug(&plug); |
| while ((bio = bio_list_pop(list))) |
| submit_bio(rw, bio); |
| blk_finish_plug(&plug); |
| } |
| |
| static void iblock_end_io_flush(struct bio *bio) |
| { |
| struct se_cmd *cmd = bio->bi_private; |
| |
| if (bio->bi_error) |
| pr_err("IBLOCK: cache flush failed: %d\n", bio->bi_error); |
| |
| if (cmd) { |
| if (bio->bi_error) |
| target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
| else |
| target_complete_cmd(cmd, SAM_STAT_GOOD); |
| } |
| |
| bio_put(bio); |
| } |
| |
| /* |
| * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
| * always flush the whole cache. |
| */ |
| static sense_reason_t |
| iblock_execute_sync_cache(struct se_cmd *cmd) |
| { |
| struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
| int immed = (cmd->t_task_cdb[1] & 0x2); |
| struct bio *bio; |
| |
| /* |
| * If the Immediate bit is set, queue up the GOOD response |
| * for this SYNCHRONIZE_CACHE op. |
| */ |
| if (immed) |
| target_complete_cmd(cmd, SAM_STAT_GOOD); |
| |
| bio = bio_alloc(GFP_KERNEL, 0); |
| bio->bi_end_io = iblock_end_io_flush; |
| bio->bi_bdev = ib_dev->ibd_bd; |
| if (!immed) |
| bio->bi_private = cmd; |
| submit_bio(WRITE_FLUSH, bio); |
| return 0; |
| } |
| |
| static sense_reason_t |
| iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) |
| { |
| struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
| struct se_device *dev = cmd->se_dev; |
| int ret; |
| |
| ret = blkdev_issue_discard(bdev, |
| target_to_linux_sector(dev, lba), |
| target_to_linux_sector(dev, nolb), |
| GFP_KERNEL, 0); |
| if (ret < 0) { |
| pr_err("blkdev_issue_discard() failed: %d\n", ret); |
| return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| } |
| |
| return 0; |
| } |
| |
| static sense_reason_t |
| iblock_execute_write_same_direct(struct block_device *bdev, struct se_cmd *cmd) |
| { |
| struct se_device *dev = cmd->se_dev; |
| struct scatterlist *sg = &cmd->t_data_sg[0]; |
| struct page *page = NULL; |
| int ret; |
| |
| if (sg->offset) { |
| page = alloc_page(GFP_KERNEL); |
| if (!page) |
| return TCM_OUT_OF_RESOURCES; |
| sg_copy_to_buffer(sg, cmd->t_data_nents, page_address(page), |
| dev->dev_attrib.block_size); |
| } |
| |
| ret = blkdev_issue_write_same(bdev, |
| target_to_linux_sector(dev, cmd->t_task_lba), |
| target_to_linux_sector(dev, |
| sbc_get_write_same_sectors(cmd)), |
| GFP_KERNEL, page ? page : sg_page(sg)); |
| if (page) |
| __free_page(page); |
| if (ret) |
| return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| |
| target_complete_cmd(cmd, GOOD); |
| return 0; |
| } |
| |
| static sense_reason_t |
| iblock_execute_write_same(struct se_cmd *cmd) |
| { |
| struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
| struct iblock_req *ibr; |
| struct scatterlist *sg; |
| struct bio *bio; |
| struct bio_list list; |
| struct se_device *dev = cmd->se_dev; |
| sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); |
| sector_t sectors = target_to_linux_sector(dev, |
| sbc_get_write_same_sectors(cmd)); |
| |
| if (cmd->prot_op) { |
| pr_err("WRITE_SAME: Protection information with IBLOCK" |
| " backends not supported\n"); |
| return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| } |
| sg = &cmd->t_data_sg[0]; |
| |
| if (cmd->t_data_nents > 1 || |
| sg->length != cmd->se_dev->dev_attrib.block_size) { |
| pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" |
| " block_size: %u\n", cmd->t_data_nents, sg->length, |
| cmd->se_dev->dev_attrib.block_size); |
| return TCM_INVALID_CDB_FIELD; |
| } |
| |
| if (bdev_write_same(bdev)) |
| return iblock_execute_write_same_direct(bdev, cmd); |
| |
| ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
| if (!ibr) |
| goto fail; |
| cmd->priv = ibr; |
| |
| bio = iblock_get_bio(cmd, block_lba, 1); |
| if (!bio) |
| goto fail_free_ibr; |
| |
| bio_list_init(&list); |
| bio_list_add(&list, bio); |
| |
| atomic_set(&ibr->pending, 1); |
| |
| while (sectors) { |
| while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) |
| != sg->length) { |
| |
| bio = iblock_get_bio(cmd, block_lba, 1); |
| if (!bio) |
| goto fail_put_bios; |
| |
| atomic_inc(&ibr->pending); |
| bio_list_add(&list, bio); |
| } |
| |
| /* Always in 512 byte units for Linux/Block */ |
| block_lba += sg->length >> IBLOCK_LBA_SHIFT; |
| sectors -= 1; |
| } |
| |
| iblock_submit_bios(&list, WRITE); |
| return 0; |
| |
| fail_put_bios: |
| while ((bio = bio_list_pop(&list))) |
| bio_put(bio); |
| fail_free_ibr: |
| kfree(ibr); |
| fail: |
| return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| } |
| |
| enum { |
| Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
| }; |
| |
| static match_table_t tokens = { |
| {Opt_udev_path, "udev_path=%s"}, |
| {Opt_readonly, "readonly=%d"}, |
| {Opt_force, "force=%d"}, |
| {Opt_err, NULL} |
| }; |
| |
| static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, |
| const char *page, ssize_t count) |
| { |
| struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| char *orig, *ptr, *arg_p, *opts; |
| substring_t args[MAX_OPT_ARGS]; |
| int ret = 0, token; |
| unsigned long tmp_readonly; |
| |
| opts = kstrdup(page, GFP_KERNEL); |
| if (!opts) |
| return -ENOMEM; |
| |
| orig = opts; |
| |
| while ((ptr = strsep(&opts, ",\n")) != NULL) { |
| if (!*ptr) |
| continue; |
| |
| token = match_token(ptr, tokens, args); |
| switch (token) { |
| case Opt_udev_path: |
| if (ib_dev->ibd_bd) { |
| pr_err("Unable to set udev_path= while" |
| " ib_dev->ibd_bd exists\n"); |
| ret = -EEXIST; |
| goto out; |
| } |
| if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], |
| SE_UDEV_PATH_LEN) == 0) { |
| ret = -EINVAL; |
| break; |
| } |
| pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
| ib_dev->ibd_udev_path); |
| ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; |
| break; |
| case Opt_readonly: |
| arg_p = match_strdup(&args[0]); |
| if (!arg_p) { |
| ret = -ENOMEM; |
| break; |
| } |
| ret = kstrtoul(arg_p, 0, &tmp_readonly); |
| kfree(arg_p); |
| if (ret < 0) { |
| pr_err("kstrtoul() failed for" |
| " readonly=\n"); |
| goto out; |
| } |
| ib_dev->ibd_readonly = tmp_readonly; |
| pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); |
| break; |
| case Opt_force: |
| break; |
| default: |
| break; |
| } |
| } |
| |
| out: |
| kfree(orig); |
| return (!ret) ? count : ret; |
| } |
| |
| static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) |
| { |
| struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| struct block_device *bd = ib_dev->ibd_bd; |
| char buf[BDEVNAME_SIZE]; |
| ssize_t bl = 0; |
| |
| if (bd) |
| bl += sprintf(b + bl, "iBlock device: %s", |
| bdevname(bd, buf)); |
| if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) |
| bl += sprintf(b + bl, " UDEV PATH: %s", |
| ib_dev->ibd_udev_path); |
| bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); |
| |
| bl += sprintf(b + bl, " "); |
| if (bd) { |
| bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", |
| MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
| "" : (bd->bd_holder == ib_dev) ? |
| "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
| } else { |
| bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
| } |
| |
| return bl; |
| } |
| |
| static int |
| iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio) |
| { |
| struct se_device *dev = cmd->se_dev; |
| struct blk_integrity *bi; |
| struct bio_integrity_payload *bip; |
| struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| struct scatterlist *sg; |
| int i, rc; |
| |
| bi = bdev_get_integrity(ib_dev->ibd_bd); |
| if (!bi) { |
| pr_err("Unable to locate bio_integrity\n"); |
| return -ENODEV; |
| } |
| |
| bip = bio_integrity_alloc(bio, GFP_NOIO, cmd->t_prot_nents); |
| if (IS_ERR(bip)) { |
| pr_err("Unable to allocate bio_integrity_payload\n"); |
| return PTR_ERR(bip); |
| } |
| |
| bip->bip_iter.bi_size = (cmd->data_length / dev->dev_attrib.block_size) * |
| dev->prot_length; |
| bip->bip_iter.bi_sector = bio->bi_iter.bi_sector; |
| |
| pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, |
| (unsigned long long)bip->bip_iter.bi_sector); |
| |
| for_each_sg(cmd->t_prot_sg, sg, cmd->t_prot_nents, i) { |
| |
| rc = bio_integrity_add_page(bio, sg_page(sg), sg->length, |
| sg->offset); |
| if (rc != sg->length) { |
| pr_err("bio_integrity_add_page() failed; %d\n", rc); |
| return -ENOMEM; |
| } |
| |
| pr_debug("Added bio integrity page: %p length: %d offset; %d\n", |
| sg_page(sg), sg->length, sg->offset); |
| } |
| |
| return 0; |
| } |
| |
| static sense_reason_t |
| iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
| enum dma_data_direction data_direction) |
| { |
| struct se_device *dev = cmd->se_dev; |
| sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); |
| struct iblock_req *ibr; |
| struct bio *bio, *bio_start; |
| struct bio_list list; |
| struct scatterlist *sg; |
| u32 sg_num = sgl_nents; |
| unsigned bio_cnt; |
| int rw = 0; |
| int i; |
| |
| if (data_direction == DMA_TO_DEVICE) { |
| struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd); |
| /* |
| * Force writethrough using WRITE_FUA if a volatile write cache |
| * is not enabled, or if initiator set the Force Unit Access bit. |
| */ |
| if (test_bit(QUEUE_FLAG_FUA, &q->queue_flags)) { |
| if (cmd->se_cmd_flags & SCF_FUA) |
| rw = WRITE_FUA; |
| else if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) |
| rw = WRITE_FUA; |
| else |
| rw = WRITE; |
| } else { |
| rw = WRITE; |
| } |
| } else { |
| rw = READ; |
| } |
| |
| ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
| if (!ibr) |
| goto fail; |
| cmd->priv = ibr; |
| |
| if (!sgl_nents) { |
| atomic_set(&ibr->pending, 1); |
| iblock_complete_cmd(cmd); |
| return 0; |
| } |
| |
| bio = iblock_get_bio(cmd, block_lba, sgl_nents); |
| if (!bio) |
| goto fail_free_ibr; |
| |
| bio_start = bio; |
| bio_list_init(&list); |
| bio_list_add(&list, bio); |
| |
| atomic_set(&ibr->pending, 2); |
| bio_cnt = 1; |
| |
| for_each_sg(sgl, sg, sgl_nents, i) { |
| /* |
| * XXX: if the length the device accepts is shorter than the |
| * length of the S/G list entry this will cause and |
| * endless loop. Better hope no driver uses huge pages. |
| */ |
| while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) |
| != sg->length) { |
| if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
| iblock_submit_bios(&list, rw); |
| bio_cnt = 0; |
| } |
| |
| bio = iblock_get_bio(cmd, block_lba, sg_num); |
| if (!bio) |
| goto fail_put_bios; |
| |
| atomic_inc(&ibr->pending); |
| bio_list_add(&list, bio); |
| bio_cnt++; |
| } |
| |
| /* Always in 512 byte units for Linux/Block */ |
| block_lba += sg->length >> IBLOCK_LBA_SHIFT; |
| sg_num--; |
| } |
| |
| if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
| int rc = iblock_alloc_bip(cmd, bio_start); |
| if (rc) |
| goto fail_put_bios; |
| } |
| |
| iblock_submit_bios(&list, rw); |
| iblock_complete_cmd(cmd); |
| return 0; |
| |
| fail_put_bios: |
| while ((bio = bio_list_pop(&list))) |
| bio_put(bio); |
| fail_free_ibr: |
| kfree(ibr); |
| fail: |
| return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| } |
| |
| static sector_t iblock_get_blocks(struct se_device *dev) |
| { |
| struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| struct block_device *bd = ib_dev->ibd_bd; |
| struct request_queue *q = bdev_get_queue(bd); |
| |
| return iblock_emulate_read_cap_with_block_size(dev, bd, q); |
| } |
| |
| static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) |
| { |
| struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| struct block_device *bd = ib_dev->ibd_bd; |
| int ret; |
| |
| ret = bdev_alignment_offset(bd); |
| if (ret == -1) |
| return 0; |
| |
| /* convert offset-bytes to offset-lbas */ |
| return ret / bdev_logical_block_size(bd); |
| } |
| |
| static unsigned int iblock_get_lbppbe(struct se_device *dev) |
| { |
| struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| struct block_device *bd = ib_dev->ibd_bd; |
| int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd); |
| |
| return ilog2(logs_per_phys); |
| } |
| |
| static unsigned int iblock_get_io_min(struct se_device *dev) |
| { |
| struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| struct block_device *bd = ib_dev->ibd_bd; |
| |
| return bdev_io_min(bd); |
| } |
| |
| static unsigned int iblock_get_io_opt(struct se_device *dev) |
| { |
| struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| struct block_device *bd = ib_dev->ibd_bd; |
| |
| return bdev_io_opt(bd); |
| } |
| |
| static struct sbc_ops iblock_sbc_ops = { |
| .execute_rw = iblock_execute_rw, |
| .execute_sync_cache = iblock_execute_sync_cache, |
| .execute_write_same = iblock_execute_write_same, |
| .execute_unmap = iblock_execute_unmap, |
| }; |
| |
| static sense_reason_t |
| iblock_parse_cdb(struct se_cmd *cmd) |
| { |
| return sbc_parse_cdb(cmd, &iblock_sbc_ops); |
| } |
| |
| static bool iblock_get_write_cache(struct se_device *dev) |
| { |
| struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| struct block_device *bd = ib_dev->ibd_bd; |
| struct request_queue *q = bdev_get_queue(bd); |
| |
| return test_bit(QUEUE_FLAG_WC, &q->queue_flags); |
| } |
| |
| static const struct target_backend_ops iblock_ops = { |
| .name = "iblock", |
| .inquiry_prod = "IBLOCK", |
| .inquiry_rev = IBLOCK_VERSION, |
| .owner = THIS_MODULE, |
| .attach_hba = iblock_attach_hba, |
| .detach_hba = iblock_detach_hba, |
| .alloc_device = iblock_alloc_device, |
| .configure_device = iblock_configure_device, |
| .free_device = iblock_free_device, |
| .parse_cdb = iblock_parse_cdb, |
| .set_configfs_dev_params = iblock_set_configfs_dev_params, |
| .show_configfs_dev_params = iblock_show_configfs_dev_params, |
| .get_device_type = sbc_get_device_type, |
| .get_blocks = iblock_get_blocks, |
| .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, |
| .get_lbppbe = iblock_get_lbppbe, |
| .get_io_min = iblock_get_io_min, |
| .get_io_opt = iblock_get_io_opt, |
| .get_write_cache = iblock_get_write_cache, |
| .tb_dev_attrib_attrs = sbc_attrib_attrs, |
| }; |
| |
| static int __init iblock_module_init(void) |
| { |
| return transport_backend_register(&iblock_ops); |
| } |
| |
| static void __exit iblock_module_exit(void) |
| { |
| target_backend_unregister(&iblock_ops); |
| } |
| |
| MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); |
| MODULE_AUTHOR("nab@Linux-iSCSI.org"); |
| MODULE_LICENSE("GPL"); |
| |
| module_init(iblock_module_init); |
| module_exit(iblock_module_exit); |