11a59d1b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2c66ac9dbSNicholas Bellinger /******************************************************************************* 3c66ac9dbSNicholas Bellinger * Filename: target_core_iblock.c 4c66ac9dbSNicholas Bellinger * 5c66ac9dbSNicholas Bellinger * This file contains the Storage Engine <-> Linux BlockIO transport 6c66ac9dbSNicholas Bellinger * specific functions. 7c66ac9dbSNicholas Bellinger * 84c76251eSNicholas Bellinger * (c) Copyright 2003-2013 Datera, Inc. 9c66ac9dbSNicholas Bellinger * 10c66ac9dbSNicholas Bellinger * Nicholas A. Bellinger <nab@kernel.org> 11c66ac9dbSNicholas Bellinger * 12c66ac9dbSNicholas Bellinger ******************************************************************************/ 13c66ac9dbSNicholas Bellinger 14c66ac9dbSNicholas Bellinger #include <linux/string.h> 15c66ac9dbSNicholas Bellinger #include <linux/parser.h> 16c66ac9dbSNicholas Bellinger #include <linux/timer.h> 17c66ac9dbSNicholas Bellinger #include <linux/fs.h> 18c66ac9dbSNicholas Bellinger #include <linux/blkdev.h> 19fe45e630SChristoph Hellwig #include <linux/blk-integrity.h> 20c66ac9dbSNicholas Bellinger #include <linux/slab.h> 21c66ac9dbSNicholas Bellinger #include <linux/spinlock.h> 22c66ac9dbSNicholas Bellinger #include <linux/bio.h> 23c66ac9dbSNicholas Bellinger #include <linux/file.h> 24827509e3SPaul Gortmaker #include <linux/module.h> 2524b83debSChristoph Hellwig #include <linux/scatterlist.h> 26ba929992SBart Van Assche #include <scsi/scsi_proto.h> 2714150a6bSChristoph Hellwig #include <asm/unaligned.h> 28c66ac9dbSNicholas Bellinger 29c66ac9dbSNicholas Bellinger #include <target/target_core_base.h> 30c4795fb2SChristoph Hellwig #include <target/target_core_backend.h> 31c66ac9dbSNicholas Bellinger 32c66ac9dbSNicholas Bellinger #include "target_core_iblock.h" 33c66ac9dbSNicholas Bellinger 34d5b4a21bSChristoph Hellwig #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ 35d5b4a21bSChristoph Hellwig #define IBLOCK_BIO_POOL_SIZE 128 36d5b4a21bSChristoph Hellwig 370fd97ccfSChristoph Hellwig static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) 380fd97ccfSChristoph Hellwig { 390fd97ccfSChristoph Hellwig return container_of(dev, struct iblock_dev, dev); 400fd97ccfSChristoph Hellwig } 410fd97ccfSChristoph Hellwig 420fd97ccfSChristoph Hellwig 43c66ac9dbSNicholas Bellinger static int iblock_attach_hba(struct se_hba *hba, u32 host_id) 44c66ac9dbSNicholas Bellinger { 456708bb27SAndy Grover pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" 46c66ac9dbSNicholas Bellinger " Generic Target Core Stack %s\n", hba->hba_id, 47ce8dd25dSChristoph Hellwig IBLOCK_VERSION, TARGET_CORE_VERSION); 48c66ac9dbSNicholas Bellinger return 0; 49c66ac9dbSNicholas Bellinger } 50c66ac9dbSNicholas Bellinger 51c66ac9dbSNicholas Bellinger static void iblock_detach_hba(struct se_hba *hba) 52c66ac9dbSNicholas Bellinger { 53c66ac9dbSNicholas Bellinger } 54c66ac9dbSNicholas Bellinger 550fd97ccfSChristoph Hellwig static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name) 56c66ac9dbSNicholas Bellinger { 57c66ac9dbSNicholas Bellinger struct iblock_dev *ib_dev = NULL; 58c66ac9dbSNicholas Bellinger 59c66ac9dbSNicholas Bellinger ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); 606708bb27SAndy Grover if (!ib_dev) { 616708bb27SAndy Grover pr_err("Unable to allocate struct iblock_dev\n"); 62c66ac9dbSNicholas Bellinger return NULL; 63c66ac9dbSNicholas Bellinger } 64c66ac9dbSNicholas Bellinger 65415ccd98SMike Christie ib_dev->ibd_plug = kcalloc(nr_cpu_ids, sizeof(*ib_dev->ibd_plug), 66415ccd98SMike Christie GFP_KERNEL); 67415ccd98SMike Christie if (!ib_dev->ibd_plug) 68415ccd98SMike Christie goto free_dev; 69415ccd98SMike Christie 706708bb27SAndy Grover pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); 71c66ac9dbSNicholas Bellinger 720fd97ccfSChristoph Hellwig return &ib_dev->dev; 73415ccd98SMike Christie 74415ccd98SMike Christie free_dev: 75415ccd98SMike Christie kfree(ib_dev); 76415ccd98SMike Christie return NULL; 77c66ac9dbSNicholas Bellinger } 78c66ac9dbSNicholas Bellinger 790fd97ccfSChristoph Hellwig static int iblock_configure_device(struct se_device *dev) 80c66ac9dbSNicholas Bellinger { 810fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 82c66ac9dbSNicholas Bellinger struct request_queue *q; 830fd97ccfSChristoph Hellwig struct block_device *bd = NULL; 84ecebbf6cSNicholas Bellinger struct blk_integrity *bi; 8544bfd018SAndy Grover fmode_t mode; 862237498fSNicholas Bellinger unsigned int max_write_zeroes_sectors; 878f13142aSColin Ian King int ret; 88c66ac9dbSNicholas Bellinger 890fd97ccfSChristoph Hellwig if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { 900fd97ccfSChristoph Hellwig pr_err("Missing udev_path= parameters for IBLOCK\n"); 910fd97ccfSChristoph Hellwig return -EINVAL; 92c66ac9dbSNicholas Bellinger } 93d5b4a21bSChristoph Hellwig 94a47a28b7SKent Overstreet ret = bioset_init(&ib_dev->ibd_bio_set, IBLOCK_BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); 95a47a28b7SKent Overstreet if (ret) { 960fd97ccfSChristoph Hellwig pr_err("IBLOCK: Unable to create bioset\n"); 970fd97ccfSChristoph Hellwig goto out; 98c66ac9dbSNicholas Bellinger } 990fd97ccfSChristoph Hellwig 1006708bb27SAndy Grover pr_debug( "IBLOCK: Claiming struct block_device: %s\n", 101c66ac9dbSNicholas Bellinger ib_dev->ibd_udev_path); 102c66ac9dbSNicholas Bellinger 10344bfd018SAndy Grover mode = FMODE_READ|FMODE_EXCL; 10444bfd018SAndy Grover if (!ib_dev->ibd_readonly) 10544bfd018SAndy Grover mode |= FMODE_WRITE; 106eeeb9522SNicholas Bellinger else 107eeeb9522SNicholas Bellinger dev->dev_flags |= DF_READ_ONLY; 10844bfd018SAndy Grover 10944bfd018SAndy Grover bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); 110613640e4SNicholas Bellinger if (IS_ERR(bd)) { 111613640e4SNicholas Bellinger ret = PTR_ERR(bd); 1120fd97ccfSChristoph Hellwig goto out_free_bioset; 113613640e4SNicholas Bellinger } 114c66ac9dbSNicholas Bellinger ib_dev->ibd_bd = bd; 115c66ac9dbSNicholas Bellinger 1160fd97ccfSChristoph Hellwig q = bdev_get_queue(bd); 1170fd97ccfSChristoph Hellwig 1180fd97ccfSChristoph Hellwig dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); 119046ba642SNicholas Bellinger dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q); 1200fd97ccfSChristoph Hellwig dev->dev_attrib.hw_queue_depth = q->nr_requests; 121c66ac9dbSNicholas Bellinger 122817e8b51SChristoph Hellwig if (target_configure_unmap_from_queue(&dev->dev_attrib, bd)) 1236708bb27SAndy Grover pr_debug("IBLOCK: BLOCK Discard support available," 124c66ac9dbSNicholas Bellinger " disabled by default\n"); 1258a9ebe71SMike Christie 126f6970ad3SNicholas Bellinger /* 127f6970ad3SNicholas Bellinger * Enable write same emulation for IBLOCK and use 0xFFFF as 128f6970ad3SNicholas Bellinger * the smaller WRITE_SAME(10) only has a two-byte block count. 129f6970ad3SNicholas Bellinger */ 1302237498fSNicholas Bellinger max_write_zeroes_sectors = bdev_write_zeroes_sectors(bd); 1312237498fSNicholas Bellinger if (max_write_zeroes_sectors) 1322237498fSNicholas Bellinger dev->dev_attrib.max_write_same_len = max_write_zeroes_sectors; 1332237498fSNicholas Bellinger else 134f6970ad3SNicholas Bellinger dev->dev_attrib.max_write_same_len = 0xFFFF; 135c66ac9dbSNicholas Bellinger 13610f0d2a5SChristoph Hellwig if (bdev_nonrot(bd)) 1370fd97ccfSChristoph Hellwig dev->dev_attrib.is_nonrot = 1; 138d0c8b259SNicholas Bellinger 139ecebbf6cSNicholas Bellinger bi = bdev_get_integrity(bd); 140ecebbf6cSNicholas Bellinger if (bi) { 141a47a28b7SKent Overstreet struct bio_set *bs = &ib_dev->ibd_bio_set; 142ecebbf6cSNicholas Bellinger 1430f8087ecSMartin K. Petersen if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-IP") || 1440f8087ecSMartin K. Petersen !strcmp(bi->profile->name, "T10-DIF-TYPE1-IP")) { 145ecebbf6cSNicholas Bellinger pr_err("IBLOCK export of blk_integrity: %s not" 1460f8087ecSMartin K. Petersen " supported\n", bi->profile->name); 147ecebbf6cSNicholas Bellinger ret = -ENOSYS; 148ecebbf6cSNicholas Bellinger goto out_blkdev_put; 149ecebbf6cSNicholas Bellinger } 150ecebbf6cSNicholas Bellinger 1510f8087ecSMartin K. Petersen if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-CRC")) { 152ecebbf6cSNicholas Bellinger dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT; 1530f8087ecSMartin K. Petersen } else if (!strcmp(bi->profile->name, "T10-DIF-TYPE1-CRC")) { 154ecebbf6cSNicholas Bellinger dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT; 155ecebbf6cSNicholas Bellinger } 156ecebbf6cSNicholas Bellinger 157ecebbf6cSNicholas Bellinger if (dev->dev_attrib.pi_prot_type) { 158ecebbf6cSNicholas Bellinger if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) { 159ecebbf6cSNicholas Bellinger pr_err("Unable to allocate bioset for PI\n"); 160ecebbf6cSNicholas Bellinger ret = -ENOMEM; 161ecebbf6cSNicholas Bellinger goto out_blkdev_put; 162ecebbf6cSNicholas Bellinger } 163ecebbf6cSNicholas Bellinger pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n", 164f4f8154aSKent Overstreet &bs->bio_integrity_pool); 165ecebbf6cSNicholas Bellinger } 166ecebbf6cSNicholas Bellinger dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type; 167ecebbf6cSNicholas Bellinger } 168ecebbf6cSNicholas Bellinger 1690fd97ccfSChristoph Hellwig return 0; 170e22a7f07SRoland Dreier 171ecebbf6cSNicholas Bellinger out_blkdev_put: 172ecebbf6cSNicholas Bellinger blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); 1730fd97ccfSChristoph Hellwig out_free_bioset: 174a47a28b7SKent Overstreet bioset_exit(&ib_dev->ibd_bio_set); 1750fd97ccfSChristoph Hellwig out: 1760fd97ccfSChristoph Hellwig return ret; 177c66ac9dbSNicholas Bellinger } 178c66ac9dbSNicholas Bellinger 1794cc987eaSNicholas Bellinger static void iblock_dev_call_rcu(struct rcu_head *p) 1804cc987eaSNicholas Bellinger { 1814cc987eaSNicholas Bellinger struct se_device *dev = container_of(p, struct se_device, rcu_head); 1824cc987eaSNicholas Bellinger struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 1834cc987eaSNicholas Bellinger 184415ccd98SMike Christie kfree(ib_dev->ibd_plug); 1854cc987eaSNicholas Bellinger kfree(ib_dev); 1864cc987eaSNicholas Bellinger } 1874cc987eaSNicholas Bellinger 1880fd97ccfSChristoph Hellwig static void iblock_free_device(struct se_device *dev) 189c66ac9dbSNicholas Bellinger { 19092634706SMike Christie call_rcu(&dev->rcu_head, iblock_dev_call_rcu); 19192634706SMike Christie } 19292634706SMike Christie 19392634706SMike Christie static void iblock_destroy_device(struct se_device *dev) 19492634706SMike Christie { 1950fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 196c66ac9dbSNicholas Bellinger 197bc665524SNicholas Bellinger if (ib_dev->ibd_bd != NULL) 198c66ac9dbSNicholas Bellinger blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); 199a47a28b7SKent Overstreet bioset_exit(&ib_dev->ibd_bio_set); 200c66ac9dbSNicholas Bellinger } 201c66ac9dbSNicholas Bellinger 202415ccd98SMike Christie static struct se_dev_plug *iblock_plug_device(struct se_device *se_dev) 203415ccd98SMike Christie { 204415ccd98SMike Christie struct iblock_dev *ib_dev = IBLOCK_DEV(se_dev); 205415ccd98SMike Christie struct iblock_dev_plug *ib_dev_plug; 206415ccd98SMike Christie 207415ccd98SMike Christie /* 2085aaeca25SMike Christie * Each se_device has a per cpu work this can be run from. We 209415ccd98SMike Christie * shouldn't have multiple threads on the same cpu calling this 210415ccd98SMike Christie * at the same time. 211415ccd98SMike Christie */ 2125aaeca25SMike Christie ib_dev_plug = &ib_dev->ibd_plug[raw_smp_processor_id()]; 213415ccd98SMike Christie if (test_and_set_bit(IBD_PLUGF_PLUGGED, &ib_dev_plug->flags)) 214415ccd98SMike Christie return NULL; 215415ccd98SMike Christie 216415ccd98SMike Christie blk_start_plug(&ib_dev_plug->blk_plug); 217415ccd98SMike Christie return &ib_dev_plug->se_plug; 218415ccd98SMike Christie } 219415ccd98SMike Christie 220415ccd98SMike Christie static void iblock_unplug_device(struct se_dev_plug *se_plug) 221415ccd98SMike Christie { 222415ccd98SMike Christie struct iblock_dev_plug *ib_dev_plug = container_of(se_plug, 223415ccd98SMike Christie struct iblock_dev_plug, se_plug); 224415ccd98SMike Christie 225415ccd98SMike Christie blk_finish_plug(&ib_dev_plug->blk_plug); 226415ccd98SMike Christie clear_bit(IBD_PLUGF_PLUGGED, &ib_dev_plug->flags); 227415ccd98SMike Christie } 228415ccd98SMike Christie 229c66ac9dbSNicholas Bellinger static unsigned long long iblock_emulate_read_cap_with_block_size( 230c66ac9dbSNicholas Bellinger struct se_device *dev, 231c66ac9dbSNicholas Bellinger struct block_device *bd, 232c66ac9dbSNicholas Bellinger struct request_queue *q) 233c66ac9dbSNicholas Bellinger { 234c66ac9dbSNicholas Bellinger u32 block_size = bdev_logical_block_size(bd); 23564f0f426SChristoph Hellwig unsigned long long blocks_long = 23664f0f426SChristoph Hellwig div_u64(bdev_nr_bytes(bd), block_size) - 1; 237c66ac9dbSNicholas Bellinger 2380fd97ccfSChristoph Hellwig if (block_size == dev->dev_attrib.block_size) 239c66ac9dbSNicholas Bellinger return blocks_long; 240c66ac9dbSNicholas Bellinger 241c66ac9dbSNicholas Bellinger switch (block_size) { 242c66ac9dbSNicholas Bellinger case 4096: 2430fd97ccfSChristoph Hellwig switch (dev->dev_attrib.block_size) { 244c66ac9dbSNicholas Bellinger case 2048: 245c66ac9dbSNicholas Bellinger blocks_long <<= 1; 246c66ac9dbSNicholas Bellinger break; 247c66ac9dbSNicholas Bellinger case 1024: 248c66ac9dbSNicholas Bellinger blocks_long <<= 2; 249c66ac9dbSNicholas Bellinger break; 250c66ac9dbSNicholas Bellinger case 512: 251c66ac9dbSNicholas Bellinger blocks_long <<= 3; 252492096ecSGustavo A. R. Silva break; 253c66ac9dbSNicholas Bellinger default: 254c66ac9dbSNicholas Bellinger break; 255c66ac9dbSNicholas Bellinger } 256c66ac9dbSNicholas Bellinger break; 257c66ac9dbSNicholas Bellinger case 2048: 2580fd97ccfSChristoph Hellwig switch (dev->dev_attrib.block_size) { 259c66ac9dbSNicholas Bellinger case 4096: 260c66ac9dbSNicholas Bellinger blocks_long >>= 1; 261c66ac9dbSNicholas Bellinger break; 262c66ac9dbSNicholas Bellinger case 1024: 263c66ac9dbSNicholas Bellinger blocks_long <<= 1; 264c66ac9dbSNicholas Bellinger break; 265c66ac9dbSNicholas Bellinger case 512: 266c66ac9dbSNicholas Bellinger blocks_long <<= 2; 267c66ac9dbSNicholas Bellinger break; 268c66ac9dbSNicholas Bellinger default: 269c66ac9dbSNicholas Bellinger break; 270c66ac9dbSNicholas Bellinger } 271c66ac9dbSNicholas Bellinger break; 272c66ac9dbSNicholas Bellinger case 1024: 2730fd97ccfSChristoph Hellwig switch (dev->dev_attrib.block_size) { 274c66ac9dbSNicholas Bellinger case 4096: 275c66ac9dbSNicholas Bellinger blocks_long >>= 2; 276c66ac9dbSNicholas Bellinger break; 277c66ac9dbSNicholas Bellinger case 2048: 278c66ac9dbSNicholas Bellinger blocks_long >>= 1; 279c66ac9dbSNicholas Bellinger break; 280c66ac9dbSNicholas Bellinger case 512: 281c66ac9dbSNicholas Bellinger blocks_long <<= 1; 282c66ac9dbSNicholas Bellinger break; 283c66ac9dbSNicholas Bellinger default: 284c66ac9dbSNicholas Bellinger break; 285c66ac9dbSNicholas Bellinger } 286c66ac9dbSNicholas Bellinger break; 287c66ac9dbSNicholas Bellinger case 512: 2880fd97ccfSChristoph Hellwig switch (dev->dev_attrib.block_size) { 289c66ac9dbSNicholas Bellinger case 4096: 290c66ac9dbSNicholas Bellinger blocks_long >>= 3; 291c66ac9dbSNicholas Bellinger break; 292c66ac9dbSNicholas Bellinger case 2048: 293c66ac9dbSNicholas Bellinger blocks_long >>= 2; 294c66ac9dbSNicholas Bellinger break; 295c66ac9dbSNicholas Bellinger case 1024: 296c66ac9dbSNicholas Bellinger blocks_long >>= 1; 297c66ac9dbSNicholas Bellinger break; 298c66ac9dbSNicholas Bellinger default: 299c66ac9dbSNicholas Bellinger break; 300c66ac9dbSNicholas Bellinger } 301c66ac9dbSNicholas Bellinger break; 302c66ac9dbSNicholas Bellinger default: 303c66ac9dbSNicholas Bellinger break; 304c66ac9dbSNicholas Bellinger } 305c66ac9dbSNicholas Bellinger 306c66ac9dbSNicholas Bellinger return blocks_long; 307c66ac9dbSNicholas Bellinger } 308c66ac9dbSNicholas Bellinger 3093a41d85fSNicholas Bellinger static void iblock_complete_cmd(struct se_cmd *cmd) 3103a41d85fSNicholas Bellinger { 3113a41d85fSNicholas Bellinger struct iblock_req *ibr = cmd->priv; 3123a41d85fSNicholas Bellinger u8 status; 3133a41d85fSNicholas Bellinger 3145981c245SElena Reshetova if (!refcount_dec_and_test(&ibr->pending)) 3153a41d85fSNicholas Bellinger return; 3163a41d85fSNicholas Bellinger 3173a41d85fSNicholas Bellinger if (atomic_read(&ibr->ib_bio_err_cnt)) 3183a41d85fSNicholas Bellinger status = SAM_STAT_CHECK_CONDITION; 3193a41d85fSNicholas Bellinger else 3203a41d85fSNicholas Bellinger status = SAM_STAT_GOOD; 3213a41d85fSNicholas Bellinger 3223a41d85fSNicholas Bellinger target_complete_cmd(cmd, status); 3233a41d85fSNicholas Bellinger kfree(ibr); 3243a41d85fSNicholas Bellinger } 3253a41d85fSNicholas Bellinger 3264246a0b6SChristoph Hellwig static void iblock_bio_done(struct bio *bio) 3273a41d85fSNicholas Bellinger { 3283a41d85fSNicholas Bellinger struct se_cmd *cmd = bio->bi_private; 3293a41d85fSNicholas Bellinger struct iblock_req *ibr = cmd->priv; 3303a41d85fSNicholas Bellinger 3314e4cbee9SChristoph Hellwig if (bio->bi_status) { 3324e4cbee9SChristoph Hellwig pr_err("bio error: %p, err: %d\n", bio, bio->bi_status); 3333a41d85fSNicholas Bellinger /* 3343a41d85fSNicholas Bellinger * Bump the ib_bio_err_cnt and release bio. 3353a41d85fSNicholas Bellinger */ 3363a41d85fSNicholas Bellinger atomic_inc(&ibr->ib_bio_err_cnt); 3374e857c58SPeter Zijlstra smp_mb__after_atomic(); 3383a41d85fSNicholas Bellinger } 3393a41d85fSNicholas Bellinger 3403a41d85fSNicholas Bellinger bio_put(bio); 3413a41d85fSNicholas Bellinger 3423a41d85fSNicholas Bellinger iblock_complete_cmd(cmd); 3433a41d85fSNicholas Bellinger } 3443a41d85fSNicholas Bellinger 345bc9e0e36SChaitanya Kulkarni static struct bio *iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num, 346bc9e0e36SChaitanya Kulkarni unsigned int opf) 3473a41d85fSNicholas Bellinger { 3483a41d85fSNicholas Bellinger struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); 3493a41d85fSNicholas Bellinger struct bio *bio; 3503a41d85fSNicholas Bellinger 3513a41d85fSNicholas Bellinger /* 3523a41d85fSNicholas Bellinger * Only allocate as many vector entries as the bio code allows us to, 3533a41d85fSNicholas Bellinger * we'll loop later on until we have handled the whole request. 3543a41d85fSNicholas Bellinger */ 355609be106SChristoph Hellwig bio = bio_alloc_bioset(ib_dev->ibd_bd, bio_max_segs(sg_num), opf, 356609be106SChristoph Hellwig GFP_NOIO, &ib_dev->ibd_bio_set); 3573a41d85fSNicholas Bellinger if (!bio) { 3583a41d85fSNicholas Bellinger pr_err("Unable to allocate memory for bio\n"); 3593a41d85fSNicholas Bellinger return NULL; 3603a41d85fSNicholas Bellinger } 3613a41d85fSNicholas Bellinger 3623a41d85fSNicholas Bellinger bio->bi_private = cmd; 3633a41d85fSNicholas Bellinger bio->bi_end_io = &iblock_bio_done; 3644f024f37SKent Overstreet bio->bi_iter.bi_sector = lba; 3653a41d85fSNicholas Bellinger 3663a41d85fSNicholas Bellinger return bio; 3673a41d85fSNicholas Bellinger } 3683a41d85fSNicholas Bellinger 3694e49ea4aSMike Christie static void iblock_submit_bios(struct bio_list *list) 3703a41d85fSNicholas Bellinger { 3713a41d85fSNicholas Bellinger struct blk_plug plug; 3723a41d85fSNicholas Bellinger struct bio *bio; 373415ccd98SMike Christie /* 374415ccd98SMike Christie * The block layer handles nested plugs, so just plug/unplug to handle 375415ccd98SMike Christie * fabric drivers that didn't support batching and multi bio cmds. 376415ccd98SMike Christie */ 3773a41d85fSNicholas Bellinger blk_start_plug(&plug); 3783a41d85fSNicholas Bellinger while ((bio = bio_list_pop(list))) 3794e49ea4aSMike Christie submit_bio(bio); 3803a41d85fSNicholas Bellinger blk_finish_plug(&plug); 3813a41d85fSNicholas Bellinger } 3823a41d85fSNicholas Bellinger 3834246a0b6SChristoph Hellwig static void iblock_end_io_flush(struct bio *bio) 384df5fa691SChristoph Hellwig { 385df5fa691SChristoph Hellwig struct se_cmd *cmd = bio->bi_private; 386df5fa691SChristoph Hellwig 3874e4cbee9SChristoph Hellwig if (bio->bi_status) 3884e4cbee9SChristoph Hellwig pr_err("IBLOCK: cache flush failed: %d\n", bio->bi_status); 389df5fa691SChristoph Hellwig 3905787cacdSChristoph Hellwig if (cmd) { 3914e4cbee9SChristoph Hellwig if (bio->bi_status) 3925787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 393de103c93SChristoph Hellwig else 3945787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 3955787cacdSChristoph Hellwig } 3965787cacdSChristoph Hellwig 397df5fa691SChristoph Hellwig bio_put(bio); 398df5fa691SChristoph Hellwig } 399df5fa691SChristoph Hellwig 400c66ac9dbSNicholas Bellinger /* 401df5fa691SChristoph Hellwig * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must 402df5fa691SChristoph Hellwig * always flush the whole cache. 403c66ac9dbSNicholas Bellinger */ 404de103c93SChristoph Hellwig static sense_reason_t 405de103c93SChristoph Hellwig iblock_execute_sync_cache(struct se_cmd *cmd) 406c66ac9dbSNicholas Bellinger { 4070fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); 408a1d8b49aSAndy Grover int immed = (cmd->t_task_cdb[1] & 0x2); 409df5fa691SChristoph Hellwig struct bio *bio; 410c66ac9dbSNicholas Bellinger 411c66ac9dbSNicholas Bellinger /* 412c66ac9dbSNicholas Bellinger * If the Immediate bit is set, queue up the GOOD response 413df5fa691SChristoph Hellwig * for this SYNCHRONIZE_CACHE op. 414c66ac9dbSNicholas Bellinger */ 415c66ac9dbSNicholas Bellinger if (immed) 4165787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 417c66ac9dbSNicholas Bellinger 41807888c66SChristoph Hellwig bio = bio_alloc(ib_dev->ibd_bd, 0, REQ_OP_WRITE | REQ_PREFLUSH, 41907888c66SChristoph Hellwig GFP_KERNEL); 420df5fa691SChristoph Hellwig bio->bi_end_io = iblock_end_io_flush; 421c66ac9dbSNicholas Bellinger if (!immed) 422df5fa691SChristoph Hellwig bio->bi_private = cmd; 4234e49ea4aSMike Christie submit_bio(bio); 424ad67f0d9SChristoph Hellwig return 0; 425c66ac9dbSNicholas Bellinger } 426c66ac9dbSNicholas Bellinger 427de103c93SChristoph Hellwig static sense_reason_t 42862e46942SChristoph Hellwig iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) 429dbc21c5aSAsias He { 43062e46942SChristoph Hellwig struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; 4318a9ebe71SMike Christie struct se_device *dev = cmd->se_dev; 432dbc21c5aSAsias He int ret; 433dbc21c5aSAsias He 4348a9ebe71SMike Christie ret = blkdev_issue_discard(bdev, 4358a9ebe71SMike Christie target_to_linux_sector(dev, lba), 4368a9ebe71SMike Christie target_to_linux_sector(dev, nolb), 4378a9ebe71SMike Christie GFP_KERNEL, 0); 438dbc21c5aSAsias He if (ret < 0) { 439dbc21c5aSAsias He pr_err("blkdev_issue_discard() failed: %d\n", ret); 440dbc21c5aSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 441dbc21c5aSAsias He } 442dbc21c5aSAsias He 443dbc21c5aSAsias He return 0; 444dbc21c5aSAsias He } 445dbc21c5aSAsias He 446dbc21c5aSAsias He static sense_reason_t 4472237498fSNicholas Bellinger iblock_execute_zero_out(struct block_device *bdev, struct se_cmd *cmd) 44807b63196SMike Christie { 44907b63196SMike Christie struct se_device *dev = cmd->se_dev; 45007b63196SMike Christie struct scatterlist *sg = &cmd->t_data_sg[0]; 451f5957dadSBryant G Ly unsigned char *buf, *not_zero; 452f5957dadSBryant G Ly int ret; 45307b63196SMike Christie 4542237498fSNicholas Bellinger buf = kmap(sg_page(sg)) + sg->offset; 4552237498fSNicholas Bellinger if (!buf) 4562237498fSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4572237498fSNicholas Bellinger /* 4582237498fSNicholas Bellinger * Fall back to block_execute_write_same() slow-path if 4592237498fSNicholas Bellinger * incoming WRITE_SAME payload does not contain zeros. 4602237498fSNicholas Bellinger */ 461f5957dadSBryant G Ly not_zero = memchr_inv(buf, 0x00, cmd->data_length); 4622237498fSNicholas Bellinger kunmap(sg_page(sg)); 46307b63196SMike Christie 464f5957dadSBryant G Ly if (not_zero) 4652237498fSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4662237498fSNicholas Bellinger 4672237498fSNicholas Bellinger ret = blkdev_issue_zeroout(bdev, 46807b63196SMike Christie target_to_linux_sector(dev, cmd->t_task_lba), 46907b63196SMike Christie target_to_linux_sector(dev, 47007b63196SMike Christie sbc_get_write_same_sectors(cmd)), 4711d2ff149SDavid Disseldorp GFP_KERNEL, BLKDEV_ZERO_NOUNMAP); 47207b63196SMike Christie if (ret) 47307b63196SMike Christie return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 47407b63196SMike Christie 47514b40c1eSHannes Reinecke target_complete_cmd(cmd, SAM_STAT_GOOD); 47607b63196SMike Christie return 0; 47707b63196SMike Christie } 47807b63196SMike Christie 47907b63196SMike Christie static sense_reason_t 480f6970ad3SNicholas Bellinger iblock_execute_write_same(struct se_cmd *cmd) 481f6970ad3SNicholas Bellinger { 48207b63196SMike Christie struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; 483f6970ad3SNicholas Bellinger struct iblock_req *ibr; 484f6970ad3SNicholas Bellinger struct scatterlist *sg; 485f6970ad3SNicholas Bellinger struct bio *bio; 486f6970ad3SNicholas Bellinger struct bio_list list; 4878a9ebe71SMike Christie struct se_device *dev = cmd->se_dev; 4888a9ebe71SMike Christie sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); 4898a9ebe71SMike Christie sector_t sectors = target_to_linux_sector(dev, 4908a9ebe71SMike Christie sbc_get_write_same_sectors(cmd)); 491f6970ad3SNicholas Bellinger 492afd73f1bSNicholas Bellinger if (cmd->prot_op) { 493afd73f1bSNicholas Bellinger pr_err("WRITE_SAME: Protection information with IBLOCK" 494afd73f1bSNicholas Bellinger " backends not supported\n"); 495afd73f1bSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 496afd73f1bSNicholas Bellinger } 497f6970ad3SNicholas Bellinger sg = &cmd->t_data_sg[0]; 498f6970ad3SNicholas Bellinger 499f6970ad3SNicholas Bellinger if (cmd->t_data_nents > 1 || 500f6970ad3SNicholas Bellinger sg->length != cmd->se_dev->dev_attrib.block_size) { 501f6970ad3SNicholas Bellinger pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 502f6970ad3SNicholas Bellinger " block_size: %u\n", cmd->t_data_nents, sg->length, 503f6970ad3SNicholas Bellinger cmd->se_dev->dev_attrib.block_size); 504f6970ad3SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 505f6970ad3SNicholas Bellinger } 506f6970ad3SNicholas Bellinger 5072237498fSNicholas Bellinger if (bdev_write_zeroes_sectors(bdev)) { 5082237498fSNicholas Bellinger if (!iblock_execute_zero_out(bdev, cmd)) 5092237498fSNicholas Bellinger return 0; 5102237498fSNicholas Bellinger } 51107b63196SMike Christie 512f6970ad3SNicholas Bellinger ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); 513f6970ad3SNicholas Bellinger if (!ibr) 514f6970ad3SNicholas Bellinger goto fail; 515f6970ad3SNicholas Bellinger cmd->priv = ibr; 516f6970ad3SNicholas Bellinger 517bc9e0e36SChaitanya Kulkarni bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE); 518f6970ad3SNicholas Bellinger if (!bio) 519f6970ad3SNicholas Bellinger goto fail_free_ibr; 520f6970ad3SNicholas Bellinger 521f6970ad3SNicholas Bellinger bio_list_init(&list); 522f6970ad3SNicholas Bellinger bio_list_add(&list, bio); 523f6970ad3SNicholas Bellinger 5245981c245SElena Reshetova refcount_set(&ibr->pending, 1); 525f6970ad3SNicholas Bellinger 526f6970ad3SNicholas Bellinger while (sectors) { 527f6970ad3SNicholas Bellinger while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) 528f6970ad3SNicholas Bellinger != sg->length) { 529f6970ad3SNicholas Bellinger 530bc9e0e36SChaitanya Kulkarni bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE); 531f6970ad3SNicholas Bellinger if (!bio) 532f6970ad3SNicholas Bellinger goto fail_put_bios; 533f6970ad3SNicholas Bellinger 5345981c245SElena Reshetova refcount_inc(&ibr->pending); 535f6970ad3SNicholas Bellinger bio_list_add(&list, bio); 536f6970ad3SNicholas Bellinger } 537f6970ad3SNicholas Bellinger 538f6970ad3SNicholas Bellinger /* Always in 512 byte units for Linux/Block */ 53980b045b3SBart Van Assche block_lba += sg->length >> SECTOR_SHIFT; 5405676234fSRoman Bolshakov sectors -= sg->length >> SECTOR_SHIFT; 541f6970ad3SNicholas Bellinger } 542f6970ad3SNicholas Bellinger 5434e49ea4aSMike Christie iblock_submit_bios(&list); 544f6970ad3SNicholas Bellinger return 0; 545f6970ad3SNicholas Bellinger 546f6970ad3SNicholas Bellinger fail_put_bios: 547f6970ad3SNicholas Bellinger while ((bio = bio_list_pop(&list))) 548f6970ad3SNicholas Bellinger bio_put(bio); 549f6970ad3SNicholas Bellinger fail_free_ibr: 550f6970ad3SNicholas Bellinger kfree(ibr); 551f6970ad3SNicholas Bellinger fail: 552f6970ad3SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 553f6970ad3SNicholas Bellinger } 554f6970ad3SNicholas Bellinger 555c66ac9dbSNicholas Bellinger enum { 55644bfd018SAndy Grover Opt_udev_path, Opt_readonly, Opt_force, Opt_err 557c66ac9dbSNicholas Bellinger }; 558c66ac9dbSNicholas Bellinger 559c66ac9dbSNicholas Bellinger static match_table_t tokens = { 560c66ac9dbSNicholas Bellinger {Opt_udev_path, "udev_path=%s"}, 56144bfd018SAndy Grover {Opt_readonly, "readonly=%d"}, 562c66ac9dbSNicholas Bellinger {Opt_force, "force=%d"}, 563c66ac9dbSNicholas Bellinger {Opt_err, NULL} 564c66ac9dbSNicholas Bellinger }; 565c66ac9dbSNicholas Bellinger 5660fd97ccfSChristoph Hellwig static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, 567c66ac9dbSNicholas Bellinger const char *page, ssize_t count) 568c66ac9dbSNicholas Bellinger { 5690fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 5706d180253SJesper Juhl char *orig, *ptr, *arg_p, *opts; 571c66ac9dbSNicholas Bellinger substring_t args[MAX_OPT_ARGS]; 57221bca31cSRoland Dreier int ret = 0, token; 57344bfd018SAndy Grover unsigned long tmp_readonly; 574c66ac9dbSNicholas Bellinger 575c66ac9dbSNicholas Bellinger opts = kstrdup(page, GFP_KERNEL); 576c66ac9dbSNicholas Bellinger if (!opts) 577c66ac9dbSNicholas Bellinger return -ENOMEM; 578c66ac9dbSNicholas Bellinger 579c66ac9dbSNicholas Bellinger orig = opts; 580c66ac9dbSNicholas Bellinger 58190c161b6SSebastian Andrzej Siewior while ((ptr = strsep(&opts, ",\n")) != NULL) { 582c66ac9dbSNicholas Bellinger if (!*ptr) 583c66ac9dbSNicholas Bellinger continue; 584c66ac9dbSNicholas Bellinger 585c66ac9dbSNicholas Bellinger token = match_token(ptr, tokens, args); 586c66ac9dbSNicholas Bellinger switch (token) { 587c66ac9dbSNicholas Bellinger case Opt_udev_path: 588c66ac9dbSNicholas Bellinger if (ib_dev->ibd_bd) { 5896708bb27SAndy Grover pr_err("Unable to set udev_path= while" 590c66ac9dbSNicholas Bellinger " ib_dev->ibd_bd exists\n"); 591c66ac9dbSNicholas Bellinger ret = -EEXIST; 592c66ac9dbSNicholas Bellinger goto out; 593c66ac9dbSNicholas Bellinger } 594852b6ed1SNicholas Bellinger if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], 595852b6ed1SNicholas Bellinger SE_UDEV_PATH_LEN) == 0) { 596852b6ed1SNicholas Bellinger ret = -EINVAL; 5976d180253SJesper Juhl break; 5986d180253SJesper Juhl } 5996708bb27SAndy Grover pr_debug("IBLOCK: Referencing UDEV path: %s\n", 600c66ac9dbSNicholas Bellinger ib_dev->ibd_udev_path); 601c66ac9dbSNicholas Bellinger ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; 602c66ac9dbSNicholas Bellinger break; 60344bfd018SAndy Grover case Opt_readonly: 60444bfd018SAndy Grover arg_p = match_strdup(&args[0]); 60544bfd018SAndy Grover if (!arg_p) { 60644bfd018SAndy Grover ret = -ENOMEM; 60744bfd018SAndy Grover break; 60844bfd018SAndy Grover } 60957103d7fSJingoo Han ret = kstrtoul(arg_p, 0, &tmp_readonly); 61044bfd018SAndy Grover kfree(arg_p); 61144bfd018SAndy Grover if (ret < 0) { 61257103d7fSJingoo Han pr_err("kstrtoul() failed for" 61344bfd018SAndy Grover " readonly=\n"); 61444bfd018SAndy Grover goto out; 61544bfd018SAndy Grover } 61644bfd018SAndy Grover ib_dev->ibd_readonly = tmp_readonly; 61744bfd018SAndy Grover pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); 61844bfd018SAndy Grover break; 619c66ac9dbSNicholas Bellinger case Opt_force: 620c66ac9dbSNicholas Bellinger break; 621c66ac9dbSNicholas Bellinger default: 622c66ac9dbSNicholas Bellinger break; 623c66ac9dbSNicholas Bellinger } 624c66ac9dbSNicholas Bellinger } 625c66ac9dbSNicholas Bellinger 626c66ac9dbSNicholas Bellinger out: 627c66ac9dbSNicholas Bellinger kfree(orig); 628c66ac9dbSNicholas Bellinger return (!ret) ? count : ret; 629c66ac9dbSNicholas Bellinger } 630c66ac9dbSNicholas Bellinger 6310fd97ccfSChristoph Hellwig static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) 632c66ac9dbSNicholas Bellinger { 6330fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 6340fd97ccfSChristoph Hellwig struct block_device *bd = ib_dev->ibd_bd; 635c66ac9dbSNicholas Bellinger ssize_t bl = 0; 636c66ac9dbSNicholas Bellinger 637c66ac9dbSNicholas Bellinger if (bd) 6381b74ab77SChristoph Hellwig bl += sprintf(b + bl, "iBlock device: %pg", bd); 6390fd97ccfSChristoph Hellwig if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) 64044bfd018SAndy Grover bl += sprintf(b + bl, " UDEV PATH: %s", 6410fd97ccfSChristoph Hellwig ib_dev->ibd_udev_path); 6420fd97ccfSChristoph Hellwig bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); 643c66ac9dbSNicholas Bellinger 644c66ac9dbSNicholas Bellinger bl += sprintf(b + bl, " "); 645c66ac9dbSNicholas Bellinger if (bd) { 646c66ac9dbSNicholas Bellinger bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", 64757ba1059SChristoph Hellwig MAJOR(bd->bd_dev), MINOR(bd->bd_dev), 64857ba1059SChristoph Hellwig "CLAIMED: IBLOCK"); 649c66ac9dbSNicholas Bellinger } else { 65021bca31cSRoland Dreier bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); 651c66ac9dbSNicholas Bellinger } 652c66ac9dbSNicholas Bellinger 653c66ac9dbSNicholas Bellinger return bl; 654c66ac9dbSNicholas Bellinger } 655c66ac9dbSNicholas Bellinger 656ecebbf6cSNicholas Bellinger static int 657fed564f6SGreg Edwards iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio, 658fed564f6SGreg Edwards struct sg_mapping_iter *miter) 659ecebbf6cSNicholas Bellinger { 660ecebbf6cSNicholas Bellinger struct se_device *dev = cmd->se_dev; 661ecebbf6cSNicholas Bellinger struct blk_integrity *bi; 662ecebbf6cSNicholas Bellinger struct bio_integrity_payload *bip; 663ecebbf6cSNicholas Bellinger struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 664fed564f6SGreg Edwards int rc; 665fed564f6SGreg Edwards size_t resid, len; 666ecebbf6cSNicholas Bellinger 667ecebbf6cSNicholas Bellinger bi = bdev_get_integrity(ib_dev->ibd_bd); 668ecebbf6cSNicholas Bellinger if (!bi) { 669ecebbf6cSNicholas Bellinger pr_err("Unable to locate bio_integrity\n"); 670ecebbf6cSNicholas Bellinger return -ENODEV; 671ecebbf6cSNicholas Bellinger } 672ecebbf6cSNicholas Bellinger 6735f7136dbSMatthew Wilcox (Oracle) bip = bio_integrity_alloc(bio, GFP_NOIO, bio_max_segs(cmd->t_prot_nents)); 67406c1e390SKeith Busch if (IS_ERR(bip)) { 675ecebbf6cSNicholas Bellinger pr_err("Unable to allocate bio_integrity_payload\n"); 67606c1e390SKeith Busch return PTR_ERR(bip); 677ecebbf6cSNicholas Bellinger } 678ecebbf6cSNicholas Bellinger 679fed564f6SGreg Edwards bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio)); 680e4dc9a4cSIsrael Rukshin /* virtual start sector must be in integrity interval units */ 681e4dc9a4cSIsrael Rukshin bip_set_seed(bip, bio->bi_iter.bi_sector >> 682e4dc9a4cSIsrael Rukshin (bi->interval_exp - SECTOR_SHIFT)); 683ecebbf6cSNicholas Bellinger 6844e13c5d0SLinus Torvalds pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, 6854e13c5d0SLinus Torvalds (unsigned long long)bip->bip_iter.bi_sector); 686ecebbf6cSNicholas Bellinger 687fed564f6SGreg Edwards resid = bip->bip_iter.bi_size; 688fed564f6SGreg Edwards while (resid > 0 && sg_miter_next(miter)) { 689ecebbf6cSNicholas Bellinger 690fed564f6SGreg Edwards len = min_t(size_t, miter->length, resid); 691fed564f6SGreg Edwards rc = bio_integrity_add_page(bio, miter->page, len, 692fed564f6SGreg Edwards offset_in_page(miter->addr)); 693fed564f6SGreg Edwards if (rc != len) { 694ecebbf6cSNicholas Bellinger pr_err("bio_integrity_add_page() failed; %d\n", rc); 695fed564f6SGreg Edwards sg_miter_stop(miter); 696ecebbf6cSNicholas Bellinger return -ENOMEM; 697ecebbf6cSNicholas Bellinger } 698ecebbf6cSNicholas Bellinger 699fed564f6SGreg Edwards pr_debug("Added bio integrity page: %p length: %zu offset: %lu\n", 700fed564f6SGreg Edwards miter->page, len, offset_in_page(miter->addr)); 701fed564f6SGreg Edwards 702fed564f6SGreg Edwards resid -= len; 703fed564f6SGreg Edwards if (len < miter->length) 704fed564f6SGreg Edwards miter->consumed -= miter->length - len; 705ecebbf6cSNicholas Bellinger } 706fed564f6SGreg Edwards sg_miter_stop(miter); 707ecebbf6cSNicholas Bellinger 708ecebbf6cSNicholas Bellinger return 0; 709ecebbf6cSNicholas Bellinger } 710ecebbf6cSNicholas Bellinger 711de103c93SChristoph Hellwig static sense_reason_t 712a82a9538SNicholas Bellinger iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 713a82a9538SNicholas Bellinger enum dma_data_direction data_direction) 714c66ac9dbSNicholas Bellinger { 7155951146dSAndy Grover struct se_device *dev = cmd->se_dev; 7168a9ebe71SMike Christie sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); 7175787cacdSChristoph Hellwig struct iblock_req *ibr; 718fed564f6SGreg Edwards struct bio *bio; 719dbbf3e94SChristoph Hellwig struct bio_list list; 720c66ac9dbSNicholas Bellinger struct scatterlist *sg; 7215787cacdSChristoph Hellwig u32 sg_num = sgl_nents; 722bc9e0e36SChaitanya Kulkarni unsigned int opf; 723d5b4a21bSChristoph Hellwig unsigned bio_cnt; 724bc9e0e36SChaitanya Kulkarni int i, rc; 725fed564f6SGreg Edwards struct sg_mapping_iter prot_miter; 726bc9e0e36SChaitanya Kulkarni unsigned int miter_dir; 727dbbf3e94SChristoph Hellwig 7285787cacdSChristoph Hellwig if (data_direction == DMA_TO_DEVICE) { 729d0c8b259SNicholas Bellinger struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 730dbbf3e94SChristoph Hellwig /* 73170fd7614SChristoph Hellwig * Force writethrough using REQ_FUA if a volatile write cache 732d0c8b259SNicholas Bellinger * is not enabled, or if initiator set the Force Unit Access bit. 733dbbf3e94SChristoph Hellwig */ 734bc9e0e36SChaitanya Kulkarni opf = REQ_OP_WRITE; 735bc9e0e36SChaitanya Kulkarni miter_dir = SG_MITER_TO_SG; 736*a557e82eSChristoph Hellwig if (bdev_fua(ib_dev->ibd_bd)) { 737d0c8b259SNicholas Bellinger if (cmd->se_cmd_flags & SCF_FUA) 738bc9e0e36SChaitanya Kulkarni opf |= REQ_FUA; 73908e688fdSChristoph Hellwig else if (!bdev_write_cache(ib_dev->ibd_bd)) 740bc9e0e36SChaitanya Kulkarni opf |= REQ_FUA; 741d0c8b259SNicholas Bellinger } 742dbbf3e94SChristoph Hellwig } else { 743bc9e0e36SChaitanya Kulkarni opf = REQ_OP_READ; 744bc9e0e36SChaitanya Kulkarni miter_dir = SG_MITER_FROM_SG; 745dbbf3e94SChristoph Hellwig } 746dbbf3e94SChristoph Hellwig 7475787cacdSChristoph Hellwig ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); 7485787cacdSChristoph Hellwig if (!ibr) 7495787cacdSChristoph Hellwig goto fail; 7505787cacdSChristoph Hellwig cmd->priv = ibr; 7515787cacdSChristoph Hellwig 752e0de4457SPaolo Bonzini if (!sgl_nents) { 7535981c245SElena Reshetova refcount_set(&ibr->pending, 1); 754e0de4457SPaolo Bonzini iblock_complete_cmd(cmd); 755e0de4457SPaolo Bonzini return 0; 756e0de4457SPaolo Bonzini } 757e0de4457SPaolo Bonzini 758bc9e0e36SChaitanya Kulkarni bio = iblock_get_bio(cmd, block_lba, sgl_nents, opf); 7595787cacdSChristoph Hellwig if (!bio) 7605787cacdSChristoph Hellwig goto fail_free_ibr; 761c66ac9dbSNicholas Bellinger 762dbbf3e94SChristoph Hellwig bio_list_init(&list); 763dbbf3e94SChristoph Hellwig bio_list_add(&list, bio); 7645787cacdSChristoph Hellwig 7655981c245SElena Reshetova refcount_set(&ibr->pending, 2); 766d5b4a21bSChristoph Hellwig bio_cnt = 1; 767dbbf3e94SChristoph Hellwig 768fed564f6SGreg Edwards if (cmd->prot_type && dev->dev_attrib.pi_prot_type) 769fed564f6SGreg Edwards sg_miter_start(&prot_miter, cmd->t_prot_sg, cmd->t_prot_nents, 770bc9e0e36SChaitanya Kulkarni miter_dir); 771fed564f6SGreg Edwards 7725787cacdSChristoph Hellwig for_each_sg(sgl, sg, sgl_nents, i) { 773dbbf3e94SChristoph Hellwig /* 774dbbf3e94SChristoph Hellwig * XXX: if the length the device accepts is shorter than the 775dbbf3e94SChristoph Hellwig * length of the S/G list entry this will cause and 776dbbf3e94SChristoph Hellwig * endless loop. Better hope no driver uses huge pages. 777dbbf3e94SChristoph Hellwig */ 778dbbf3e94SChristoph Hellwig while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) 779dbbf3e94SChristoph Hellwig != sg->length) { 780fed564f6SGreg Edwards if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 781fed564f6SGreg Edwards rc = iblock_alloc_bip(cmd, bio, &prot_miter); 782fed564f6SGreg Edwards if (rc) 783fed564f6SGreg Edwards goto fail_put_bios; 784fed564f6SGreg Edwards } 785fed564f6SGreg Edwards 786d5b4a21bSChristoph Hellwig if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { 7874e49ea4aSMike Christie iblock_submit_bios(&list); 788d5b4a21bSChristoph Hellwig bio_cnt = 0; 789d5b4a21bSChristoph Hellwig } 790d5b4a21bSChristoph Hellwig 791bc9e0e36SChaitanya Kulkarni bio = iblock_get_bio(cmd, block_lba, sg_num, opf); 7926708bb27SAndy Grover if (!bio) 7935787cacdSChristoph Hellwig goto fail_put_bios; 7945787cacdSChristoph Hellwig 7955981c245SElena Reshetova refcount_inc(&ibr->pending); 796dbbf3e94SChristoph Hellwig bio_list_add(&list, bio); 797d5b4a21bSChristoph Hellwig bio_cnt++; 798c66ac9dbSNicholas Bellinger } 799dbbf3e94SChristoph Hellwig 800c66ac9dbSNicholas Bellinger /* Always in 512 byte units for Linux/Block */ 80180b045b3SBart Van Assche block_lba += sg->length >> SECTOR_SHIFT; 802c66ac9dbSNicholas Bellinger sg_num--; 803c66ac9dbSNicholas Bellinger } 804c66ac9dbSNicholas Bellinger 8056f16ec43SNicholas Bellinger if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 806fed564f6SGreg Edwards rc = iblock_alloc_bip(cmd, bio, &prot_miter); 807ecebbf6cSNicholas Bellinger if (rc) 808ecebbf6cSNicholas Bellinger goto fail_put_bios; 809ecebbf6cSNicholas Bellinger } 810ecebbf6cSNicholas Bellinger 8114e49ea4aSMike Christie iblock_submit_bios(&list); 8125787cacdSChristoph Hellwig iblock_complete_cmd(cmd); 81303e98c9eSNicholas Bellinger return 0; 814dbbf3e94SChristoph Hellwig 8155787cacdSChristoph Hellwig fail_put_bios: 816dbbf3e94SChristoph Hellwig while ((bio = bio_list_pop(&list))) 817c66ac9dbSNicholas Bellinger bio_put(bio); 8185787cacdSChristoph Hellwig fail_free_ibr: 8195787cacdSChristoph Hellwig kfree(ibr); 8205787cacdSChristoph Hellwig fail: 821de103c93SChristoph Hellwig return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 822c66ac9dbSNicholas Bellinger } 823c66ac9dbSNicholas Bellinger 824c66ac9dbSNicholas Bellinger static sector_t iblock_get_blocks(struct se_device *dev) 825c66ac9dbSNicholas Bellinger { 8260fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 8270fd97ccfSChristoph Hellwig struct block_device *bd = ib_dev->ibd_bd; 828c66ac9dbSNicholas Bellinger struct request_queue *q = bdev_get_queue(bd); 829c66ac9dbSNicholas Bellinger 830c66ac9dbSNicholas Bellinger return iblock_emulate_read_cap_with_block_size(dev, bd, q); 831c66ac9dbSNicholas Bellinger } 832c66ac9dbSNicholas Bellinger 8337f7caf6aSAndy Grover static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) 8347f7caf6aSAndy Grover { 8357f7caf6aSAndy Grover struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 8367f7caf6aSAndy Grover struct block_device *bd = ib_dev->ibd_bd; 8377f7caf6aSAndy Grover int ret; 8387f7caf6aSAndy Grover 8397f7caf6aSAndy Grover ret = bdev_alignment_offset(bd); 8407f7caf6aSAndy Grover if (ret == -1) 8417f7caf6aSAndy Grover return 0; 8427f7caf6aSAndy Grover 8437f7caf6aSAndy Grover /* convert offset-bytes to offset-lbas */ 8447f7caf6aSAndy Grover return ret / bdev_logical_block_size(bd); 8457f7caf6aSAndy Grover } 8467f7caf6aSAndy Grover 8477f7caf6aSAndy Grover static unsigned int iblock_get_lbppbe(struct se_device *dev) 8487f7caf6aSAndy Grover { 8497f7caf6aSAndy Grover struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 8507f7caf6aSAndy Grover struct block_device *bd = ib_dev->ibd_bd; 851c151eddbSChaitanya Kulkarni unsigned int logs_per_phys = 852a2c6c6a3SChaitanya Kulkarni bdev_physical_block_size(bd) / bdev_logical_block_size(bd); 8537f7caf6aSAndy Grover 8547f7caf6aSAndy Grover return ilog2(logs_per_phys); 8557f7caf6aSAndy Grover } 8567f7caf6aSAndy Grover 8577f7caf6aSAndy Grover static unsigned int iblock_get_io_min(struct se_device *dev) 8587f7caf6aSAndy Grover { 8597f7caf6aSAndy Grover struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 8607f7caf6aSAndy Grover struct block_device *bd = ib_dev->ibd_bd; 8617f7caf6aSAndy Grover 8627f7caf6aSAndy Grover return bdev_io_min(bd); 8637f7caf6aSAndy Grover } 8647f7caf6aSAndy Grover 8657f7caf6aSAndy Grover static unsigned int iblock_get_io_opt(struct se_device *dev) 8667f7caf6aSAndy Grover { 8677f7caf6aSAndy Grover struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 8687f7caf6aSAndy Grover struct block_device *bd = ib_dev->ibd_bd; 8697f7caf6aSAndy Grover 8707f7caf6aSAndy Grover return bdev_io_opt(bd); 8717f7caf6aSAndy Grover } 8727f7caf6aSAndy Grover 8739e999a6cSChristoph Hellwig static struct sbc_ops iblock_sbc_ops = { 8740c2ad7d1SChristoph Hellwig .execute_rw = iblock_execute_rw, 875ad67f0d9SChristoph Hellwig .execute_sync_cache = iblock_execute_sync_cache, 8766f974e8cSChristoph Hellwig .execute_write_same = iblock_execute_write_same, 87714150a6bSChristoph Hellwig .execute_unmap = iblock_execute_unmap, 8780c2ad7d1SChristoph Hellwig }; 8790c2ad7d1SChristoph Hellwig 880de103c93SChristoph Hellwig static sense_reason_t 881de103c93SChristoph Hellwig iblock_parse_cdb(struct se_cmd *cmd) 8820c2ad7d1SChristoph Hellwig { 8839e999a6cSChristoph Hellwig return sbc_parse_cdb(cmd, &iblock_sbc_ops); 8840c2ad7d1SChristoph Hellwig } 8850c2ad7d1SChristoph Hellwig 886452e2010SRashika Kheria static bool iblock_get_write_cache(struct se_device *dev) 887d0c8b259SNicholas Bellinger { 88808e688fdSChristoph Hellwig return bdev_write_cache(IBLOCK_DEV(dev)->ibd_bd); 889d0c8b259SNicholas Bellinger } 890d0c8b259SNicholas Bellinger 8910a06d430SChristoph Hellwig static const struct target_backend_ops iblock_ops = { 892c66ac9dbSNicholas Bellinger .name = "iblock", 8930fd97ccfSChristoph Hellwig .inquiry_prod = "IBLOCK", 8940fd97ccfSChristoph Hellwig .inquiry_rev = IBLOCK_VERSION, 895c66ac9dbSNicholas Bellinger .owner = THIS_MODULE, 896c66ac9dbSNicholas Bellinger .attach_hba = iblock_attach_hba, 897c66ac9dbSNicholas Bellinger .detach_hba = iblock_detach_hba, 8980fd97ccfSChristoph Hellwig .alloc_device = iblock_alloc_device, 8990fd97ccfSChristoph Hellwig .configure_device = iblock_configure_device, 90092634706SMike Christie .destroy_device = iblock_destroy_device, 901c66ac9dbSNicholas Bellinger .free_device = iblock_free_device, 902415ccd98SMike Christie .plug_device = iblock_plug_device, 903415ccd98SMike Christie .unplug_device = iblock_unplug_device, 9040c2ad7d1SChristoph Hellwig .parse_cdb = iblock_parse_cdb, 905c66ac9dbSNicholas Bellinger .set_configfs_dev_params = iblock_set_configfs_dev_params, 906c66ac9dbSNicholas Bellinger .show_configfs_dev_params = iblock_show_configfs_dev_params, 9076f23ac8aSChristoph Hellwig .get_device_type = sbc_get_device_type, 908c66ac9dbSNicholas Bellinger .get_blocks = iblock_get_blocks, 9097f7caf6aSAndy Grover .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, 9107f7caf6aSAndy Grover .get_lbppbe = iblock_get_lbppbe, 9117f7caf6aSAndy Grover .get_io_min = iblock_get_io_min, 9127f7caf6aSAndy Grover .get_io_opt = iblock_get_io_opt, 913d0c8b259SNicholas Bellinger .get_write_cache = iblock_get_write_cache, 9145873c4d1SChristoph Hellwig .tb_dev_attrib_attrs = sbc_attrib_attrs, 915c66ac9dbSNicholas Bellinger }; 916c66ac9dbSNicholas Bellinger 917c66ac9dbSNicholas Bellinger static int __init iblock_module_init(void) 918c66ac9dbSNicholas Bellinger { 9190a06d430SChristoph Hellwig return transport_backend_register(&iblock_ops); 920c66ac9dbSNicholas Bellinger } 921c66ac9dbSNicholas Bellinger 92263b91d5aSAsias He static void __exit iblock_module_exit(void) 923c66ac9dbSNicholas Bellinger { 9240a06d430SChristoph Hellwig target_backend_unregister(&iblock_ops); 925c66ac9dbSNicholas Bellinger } 926c66ac9dbSNicholas Bellinger 927c66ac9dbSNicholas Bellinger MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); 928c66ac9dbSNicholas Bellinger MODULE_AUTHOR("nab@Linux-iSCSI.org"); 929c66ac9dbSNicholas Bellinger MODULE_LICENSE("GPL"); 930c66ac9dbSNicholas Bellinger 931c66ac9dbSNicholas Bellinger module_init(iblock_module_init); 932c66ac9dbSNicholas Bellinger module_exit(iblock_module_exit); 933