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 79d7c382c5SMike Christie static bool iblock_configure_unmap(struct se_device *dev) 80d7c382c5SMike Christie { 81d7c382c5SMike Christie struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 82d7c382c5SMike Christie 83d7c382c5SMike Christie return target_configure_unmap_from_queue(&dev->dev_attrib, 84d7c382c5SMike Christie ib_dev->ibd_bd); 85d7c382c5SMike Christie } 86d7c382c5SMike Christie 870fd97ccfSChristoph Hellwig static int iblock_configure_device(struct se_device *dev) 88c66ac9dbSNicholas Bellinger { 890fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 90c66ac9dbSNicholas Bellinger struct request_queue *q; 910fd97ccfSChristoph Hellwig struct block_device *bd = NULL; 92ecebbf6cSNicholas Bellinger struct blk_integrity *bi; 9344bfd018SAndy Grover fmode_t mode; 942237498fSNicholas Bellinger unsigned int max_write_zeroes_sectors; 958f13142aSColin Ian King int ret; 96c66ac9dbSNicholas Bellinger 970fd97ccfSChristoph Hellwig if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { 980fd97ccfSChristoph Hellwig pr_err("Missing udev_path= parameters for IBLOCK\n"); 990fd97ccfSChristoph Hellwig return -EINVAL; 100c66ac9dbSNicholas Bellinger } 101d5b4a21bSChristoph Hellwig 102a47a28b7SKent Overstreet ret = bioset_init(&ib_dev->ibd_bio_set, IBLOCK_BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); 103a47a28b7SKent Overstreet if (ret) { 1040fd97ccfSChristoph Hellwig pr_err("IBLOCK: Unable to create bioset\n"); 1050fd97ccfSChristoph Hellwig goto out; 106c66ac9dbSNicholas Bellinger } 1070fd97ccfSChristoph Hellwig 1086708bb27SAndy Grover pr_debug( "IBLOCK: Claiming struct block_device: %s\n", 109c66ac9dbSNicholas Bellinger ib_dev->ibd_udev_path); 110c66ac9dbSNicholas Bellinger 11144bfd018SAndy Grover mode = FMODE_READ|FMODE_EXCL; 11244bfd018SAndy Grover if (!ib_dev->ibd_readonly) 11344bfd018SAndy Grover mode |= FMODE_WRITE; 114eeeb9522SNicholas Bellinger else 115eeeb9522SNicholas Bellinger dev->dev_flags |= DF_READ_ONLY; 11644bfd018SAndy Grover 11744bfd018SAndy Grover bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); 118613640e4SNicholas Bellinger if (IS_ERR(bd)) { 119613640e4SNicholas Bellinger ret = PTR_ERR(bd); 1200fd97ccfSChristoph Hellwig goto out_free_bioset; 121613640e4SNicholas Bellinger } 122c66ac9dbSNicholas Bellinger ib_dev->ibd_bd = bd; 123c66ac9dbSNicholas Bellinger 1240fd97ccfSChristoph Hellwig q = bdev_get_queue(bd); 1250fd97ccfSChristoph Hellwig 1260fd97ccfSChristoph Hellwig dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); 1279375031eSAnastasia Kovaleva dev->dev_attrib.hw_max_sectors = mult_frac(queue_max_hw_sectors(q), 1289375031eSAnastasia Kovaleva SECTOR_SIZE, 1299375031eSAnastasia Kovaleva dev->dev_attrib.hw_block_size); 1300fd97ccfSChristoph Hellwig dev->dev_attrib.hw_queue_depth = q->nr_requests; 131c66ac9dbSNicholas Bellinger 132f6970ad3SNicholas Bellinger /* 133f6970ad3SNicholas Bellinger * Enable write same emulation for IBLOCK and use 0xFFFF as 134f6970ad3SNicholas Bellinger * the smaller WRITE_SAME(10) only has a two-byte block count. 135f6970ad3SNicholas Bellinger */ 1362237498fSNicholas Bellinger max_write_zeroes_sectors = bdev_write_zeroes_sectors(bd); 1372237498fSNicholas Bellinger if (max_write_zeroes_sectors) 1382237498fSNicholas Bellinger dev->dev_attrib.max_write_same_len = max_write_zeroes_sectors; 1392237498fSNicholas Bellinger else 140f6970ad3SNicholas Bellinger dev->dev_attrib.max_write_same_len = 0xFFFF; 141c66ac9dbSNicholas Bellinger 14210f0d2a5SChristoph Hellwig if (bdev_nonrot(bd)) 1430fd97ccfSChristoph Hellwig dev->dev_attrib.is_nonrot = 1; 144d0c8b259SNicholas Bellinger 145ecebbf6cSNicholas Bellinger bi = bdev_get_integrity(bd); 146ecebbf6cSNicholas Bellinger if (bi) { 147a47a28b7SKent Overstreet struct bio_set *bs = &ib_dev->ibd_bio_set; 148ecebbf6cSNicholas Bellinger 1490f8087ecSMartin K. Petersen if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-IP") || 1500f8087ecSMartin K. Petersen !strcmp(bi->profile->name, "T10-DIF-TYPE1-IP")) { 151ecebbf6cSNicholas Bellinger pr_err("IBLOCK export of blk_integrity: %s not" 1520f8087ecSMartin K. Petersen " supported\n", bi->profile->name); 153ecebbf6cSNicholas Bellinger ret = -ENOSYS; 154ecebbf6cSNicholas Bellinger goto out_blkdev_put; 155ecebbf6cSNicholas Bellinger } 156ecebbf6cSNicholas Bellinger 1570f8087ecSMartin K. Petersen if (!strcmp(bi->profile->name, "T10-DIF-TYPE3-CRC")) { 158ecebbf6cSNicholas Bellinger dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT; 1590f8087ecSMartin K. Petersen } else if (!strcmp(bi->profile->name, "T10-DIF-TYPE1-CRC")) { 160ecebbf6cSNicholas Bellinger dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT; 161ecebbf6cSNicholas Bellinger } 162ecebbf6cSNicholas Bellinger 163ecebbf6cSNicholas Bellinger if (dev->dev_attrib.pi_prot_type) { 164ecebbf6cSNicholas Bellinger if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) { 165ecebbf6cSNicholas Bellinger pr_err("Unable to allocate bioset for PI\n"); 166ecebbf6cSNicholas Bellinger ret = -ENOMEM; 167ecebbf6cSNicholas Bellinger goto out_blkdev_put; 168ecebbf6cSNicholas Bellinger } 169ecebbf6cSNicholas Bellinger pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n", 170f4f8154aSKent Overstreet &bs->bio_integrity_pool); 171ecebbf6cSNicholas Bellinger } 172ecebbf6cSNicholas Bellinger dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type; 173ecebbf6cSNicholas Bellinger } 174ecebbf6cSNicholas Bellinger 1750fd97ccfSChristoph Hellwig return 0; 176e22a7f07SRoland Dreier 177ecebbf6cSNicholas Bellinger out_blkdev_put: 178ecebbf6cSNicholas Bellinger blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); 1790fd97ccfSChristoph Hellwig out_free_bioset: 180a47a28b7SKent Overstreet bioset_exit(&ib_dev->ibd_bio_set); 1810fd97ccfSChristoph Hellwig out: 1820fd97ccfSChristoph Hellwig return ret; 183c66ac9dbSNicholas Bellinger } 184c66ac9dbSNicholas Bellinger 1854cc987eaSNicholas Bellinger static void iblock_dev_call_rcu(struct rcu_head *p) 1864cc987eaSNicholas Bellinger { 1874cc987eaSNicholas Bellinger struct se_device *dev = container_of(p, struct se_device, rcu_head); 1884cc987eaSNicholas Bellinger struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 1894cc987eaSNicholas Bellinger 190415ccd98SMike Christie kfree(ib_dev->ibd_plug); 1914cc987eaSNicholas Bellinger kfree(ib_dev); 1924cc987eaSNicholas Bellinger } 1934cc987eaSNicholas Bellinger 1940fd97ccfSChristoph Hellwig static void iblock_free_device(struct se_device *dev) 195c66ac9dbSNicholas Bellinger { 19692634706SMike Christie call_rcu(&dev->rcu_head, iblock_dev_call_rcu); 19792634706SMike Christie } 19892634706SMike Christie 19992634706SMike Christie static void iblock_destroy_device(struct se_device *dev) 20092634706SMike Christie { 2010fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 202c66ac9dbSNicholas Bellinger 203bc665524SNicholas Bellinger if (ib_dev->ibd_bd != NULL) 204c66ac9dbSNicholas Bellinger blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); 205a47a28b7SKent Overstreet bioset_exit(&ib_dev->ibd_bio_set); 206c66ac9dbSNicholas Bellinger } 207c66ac9dbSNicholas Bellinger 208415ccd98SMike Christie static struct se_dev_plug *iblock_plug_device(struct se_device *se_dev) 209415ccd98SMike Christie { 210415ccd98SMike Christie struct iblock_dev *ib_dev = IBLOCK_DEV(se_dev); 211415ccd98SMike Christie struct iblock_dev_plug *ib_dev_plug; 212415ccd98SMike Christie 213415ccd98SMike Christie /* 2145aaeca25SMike Christie * Each se_device has a per cpu work this can be run from. We 215415ccd98SMike Christie * shouldn't have multiple threads on the same cpu calling this 216415ccd98SMike Christie * at the same time. 217415ccd98SMike Christie */ 2185aaeca25SMike Christie ib_dev_plug = &ib_dev->ibd_plug[raw_smp_processor_id()]; 219415ccd98SMike Christie if (test_and_set_bit(IBD_PLUGF_PLUGGED, &ib_dev_plug->flags)) 220415ccd98SMike Christie return NULL; 221415ccd98SMike Christie 222415ccd98SMike Christie blk_start_plug(&ib_dev_plug->blk_plug); 223415ccd98SMike Christie return &ib_dev_plug->se_plug; 224415ccd98SMike Christie } 225415ccd98SMike Christie 226415ccd98SMike Christie static void iblock_unplug_device(struct se_dev_plug *se_plug) 227415ccd98SMike Christie { 228415ccd98SMike Christie struct iblock_dev_plug *ib_dev_plug = container_of(se_plug, 229415ccd98SMike Christie struct iblock_dev_plug, se_plug); 230415ccd98SMike Christie 231415ccd98SMike Christie blk_finish_plug(&ib_dev_plug->blk_plug); 232415ccd98SMike Christie clear_bit(IBD_PLUGF_PLUGGED, &ib_dev_plug->flags); 233415ccd98SMike Christie } 234415ccd98SMike Christie 235f915f58eSChristoph Hellwig static sector_t iblock_get_blocks(struct se_device *dev) 236c66ac9dbSNicholas Bellinger { 237f915f58eSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 238f915f58eSChristoph Hellwig u32 block_size = bdev_logical_block_size(ib_dev->ibd_bd); 23964f0f426SChristoph Hellwig unsigned long long blocks_long = 240f915f58eSChristoph Hellwig div_u64(bdev_nr_bytes(ib_dev->ibd_bd), block_size) - 1; 241c66ac9dbSNicholas Bellinger 2420fd97ccfSChristoph Hellwig if (block_size == dev->dev_attrib.block_size) 243c66ac9dbSNicholas Bellinger return blocks_long; 244c66ac9dbSNicholas Bellinger 245c66ac9dbSNicholas Bellinger switch (block_size) { 246c66ac9dbSNicholas Bellinger case 4096: 2470fd97ccfSChristoph Hellwig switch (dev->dev_attrib.block_size) { 248c66ac9dbSNicholas Bellinger case 2048: 249c66ac9dbSNicholas Bellinger blocks_long <<= 1; 250c66ac9dbSNicholas Bellinger break; 251c66ac9dbSNicholas Bellinger case 1024: 252c66ac9dbSNicholas Bellinger blocks_long <<= 2; 253c66ac9dbSNicholas Bellinger break; 254c66ac9dbSNicholas Bellinger case 512: 255c66ac9dbSNicholas Bellinger blocks_long <<= 3; 256492096ecSGustavo A. R. Silva break; 257c66ac9dbSNicholas Bellinger default: 258c66ac9dbSNicholas Bellinger break; 259c66ac9dbSNicholas Bellinger } 260c66ac9dbSNicholas Bellinger break; 261c66ac9dbSNicholas Bellinger case 2048: 2620fd97ccfSChristoph Hellwig switch (dev->dev_attrib.block_size) { 263c66ac9dbSNicholas Bellinger case 4096: 264c66ac9dbSNicholas Bellinger blocks_long >>= 1; 265c66ac9dbSNicholas Bellinger break; 266c66ac9dbSNicholas Bellinger case 1024: 267c66ac9dbSNicholas Bellinger blocks_long <<= 1; 268c66ac9dbSNicholas Bellinger break; 269c66ac9dbSNicholas Bellinger case 512: 270c66ac9dbSNicholas Bellinger blocks_long <<= 2; 271c66ac9dbSNicholas Bellinger break; 272c66ac9dbSNicholas Bellinger default: 273c66ac9dbSNicholas Bellinger break; 274c66ac9dbSNicholas Bellinger } 275c66ac9dbSNicholas Bellinger break; 276c66ac9dbSNicholas Bellinger case 1024: 2770fd97ccfSChristoph Hellwig switch (dev->dev_attrib.block_size) { 278c66ac9dbSNicholas Bellinger case 4096: 279c66ac9dbSNicholas Bellinger blocks_long >>= 2; 280c66ac9dbSNicholas Bellinger break; 281c66ac9dbSNicholas Bellinger case 2048: 282c66ac9dbSNicholas Bellinger blocks_long >>= 1; 283c66ac9dbSNicholas Bellinger break; 284c66ac9dbSNicholas Bellinger case 512: 285c66ac9dbSNicholas Bellinger blocks_long <<= 1; 286c66ac9dbSNicholas Bellinger break; 287c66ac9dbSNicholas Bellinger default: 288c66ac9dbSNicholas Bellinger break; 289c66ac9dbSNicholas Bellinger } 290c66ac9dbSNicholas Bellinger break; 291c66ac9dbSNicholas Bellinger case 512: 2920fd97ccfSChristoph Hellwig switch (dev->dev_attrib.block_size) { 293c66ac9dbSNicholas Bellinger case 4096: 294c66ac9dbSNicholas Bellinger blocks_long >>= 3; 295c66ac9dbSNicholas Bellinger break; 296c66ac9dbSNicholas Bellinger case 2048: 297c66ac9dbSNicholas Bellinger blocks_long >>= 2; 298c66ac9dbSNicholas Bellinger break; 299c66ac9dbSNicholas Bellinger case 1024: 300c66ac9dbSNicholas Bellinger blocks_long >>= 1; 301c66ac9dbSNicholas Bellinger break; 302c66ac9dbSNicholas Bellinger default: 303c66ac9dbSNicholas Bellinger break; 304c66ac9dbSNicholas Bellinger } 305c66ac9dbSNicholas Bellinger break; 306c66ac9dbSNicholas Bellinger default: 307c66ac9dbSNicholas Bellinger break; 308c66ac9dbSNicholas Bellinger } 309c66ac9dbSNicholas Bellinger 310c66ac9dbSNicholas Bellinger return blocks_long; 311c66ac9dbSNicholas Bellinger } 312c66ac9dbSNicholas Bellinger 3133a41d85fSNicholas Bellinger static void iblock_complete_cmd(struct se_cmd *cmd) 3143a41d85fSNicholas Bellinger { 3153a41d85fSNicholas Bellinger struct iblock_req *ibr = cmd->priv; 3163a41d85fSNicholas Bellinger u8 status; 3173a41d85fSNicholas Bellinger 3185981c245SElena Reshetova if (!refcount_dec_and_test(&ibr->pending)) 3193a41d85fSNicholas Bellinger return; 3203a41d85fSNicholas Bellinger 3213a41d85fSNicholas Bellinger if (atomic_read(&ibr->ib_bio_err_cnt)) 3223a41d85fSNicholas Bellinger status = SAM_STAT_CHECK_CONDITION; 3233a41d85fSNicholas Bellinger else 3243a41d85fSNicholas Bellinger status = SAM_STAT_GOOD; 3253a41d85fSNicholas Bellinger 3263a41d85fSNicholas Bellinger target_complete_cmd(cmd, status); 3273a41d85fSNicholas Bellinger kfree(ibr); 3283a41d85fSNicholas Bellinger } 3293a41d85fSNicholas Bellinger 3304246a0b6SChristoph Hellwig static void iblock_bio_done(struct bio *bio) 3313a41d85fSNicholas Bellinger { 3323a41d85fSNicholas Bellinger struct se_cmd *cmd = bio->bi_private; 3333a41d85fSNicholas Bellinger struct iblock_req *ibr = cmd->priv; 3343a41d85fSNicholas Bellinger 3354e4cbee9SChristoph Hellwig if (bio->bi_status) { 3364e4cbee9SChristoph Hellwig pr_err("bio error: %p, err: %d\n", bio, bio->bi_status); 3373a41d85fSNicholas Bellinger /* 3383a41d85fSNicholas Bellinger * Bump the ib_bio_err_cnt and release bio. 3393a41d85fSNicholas Bellinger */ 3403a41d85fSNicholas Bellinger atomic_inc(&ibr->ib_bio_err_cnt); 3414e857c58SPeter Zijlstra smp_mb__after_atomic(); 3423a41d85fSNicholas Bellinger } 3433a41d85fSNicholas Bellinger 3443a41d85fSNicholas Bellinger bio_put(bio); 3453a41d85fSNicholas Bellinger 3463a41d85fSNicholas Bellinger iblock_complete_cmd(cmd); 3473a41d85fSNicholas Bellinger } 3483a41d85fSNicholas Bellinger 349bc9e0e36SChaitanya Kulkarni static struct bio *iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num, 35079fe9d7dSBart Van Assche blk_opf_t opf) 3513a41d85fSNicholas Bellinger { 3523a41d85fSNicholas Bellinger struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); 3533a41d85fSNicholas Bellinger struct bio *bio; 3543a41d85fSNicholas Bellinger 3553a41d85fSNicholas Bellinger /* 3563a41d85fSNicholas Bellinger * Only allocate as many vector entries as the bio code allows us to, 3573a41d85fSNicholas Bellinger * we'll loop later on until we have handled the whole request. 3583a41d85fSNicholas Bellinger */ 359609be106SChristoph Hellwig bio = bio_alloc_bioset(ib_dev->ibd_bd, bio_max_segs(sg_num), opf, 360609be106SChristoph Hellwig GFP_NOIO, &ib_dev->ibd_bio_set); 3613a41d85fSNicholas Bellinger if (!bio) { 3623a41d85fSNicholas Bellinger pr_err("Unable to allocate memory for bio\n"); 3633a41d85fSNicholas Bellinger return NULL; 3643a41d85fSNicholas Bellinger } 3653a41d85fSNicholas Bellinger 3663a41d85fSNicholas Bellinger bio->bi_private = cmd; 3673a41d85fSNicholas Bellinger bio->bi_end_io = &iblock_bio_done; 3684f024f37SKent Overstreet bio->bi_iter.bi_sector = lba; 3693a41d85fSNicholas Bellinger 3703a41d85fSNicholas Bellinger return bio; 3713a41d85fSNicholas Bellinger } 3723a41d85fSNicholas Bellinger 3734e49ea4aSMike Christie static void iblock_submit_bios(struct bio_list *list) 3743a41d85fSNicholas Bellinger { 3753a41d85fSNicholas Bellinger struct blk_plug plug; 3763a41d85fSNicholas Bellinger struct bio *bio; 377415ccd98SMike Christie /* 378415ccd98SMike Christie * The block layer handles nested plugs, so just plug/unplug to handle 379415ccd98SMike Christie * fabric drivers that didn't support batching and multi bio cmds. 380415ccd98SMike Christie */ 3813a41d85fSNicholas Bellinger blk_start_plug(&plug); 3823a41d85fSNicholas Bellinger while ((bio = bio_list_pop(list))) 3834e49ea4aSMike Christie submit_bio(bio); 3843a41d85fSNicholas Bellinger blk_finish_plug(&plug); 3853a41d85fSNicholas Bellinger } 3863a41d85fSNicholas Bellinger 3874246a0b6SChristoph Hellwig static void iblock_end_io_flush(struct bio *bio) 388df5fa691SChristoph Hellwig { 389df5fa691SChristoph Hellwig struct se_cmd *cmd = bio->bi_private; 390df5fa691SChristoph Hellwig 3914e4cbee9SChristoph Hellwig if (bio->bi_status) 3924e4cbee9SChristoph Hellwig pr_err("IBLOCK: cache flush failed: %d\n", bio->bi_status); 393df5fa691SChristoph Hellwig 3945787cacdSChristoph Hellwig if (cmd) { 3954e4cbee9SChristoph Hellwig if (bio->bi_status) 3965787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 397de103c93SChristoph Hellwig else 3985787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 3995787cacdSChristoph Hellwig } 4005787cacdSChristoph Hellwig 401df5fa691SChristoph Hellwig bio_put(bio); 402df5fa691SChristoph Hellwig } 403df5fa691SChristoph Hellwig 404c66ac9dbSNicholas Bellinger /* 405df5fa691SChristoph Hellwig * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must 406df5fa691SChristoph Hellwig * always flush the whole cache. 407c66ac9dbSNicholas Bellinger */ 408de103c93SChristoph Hellwig static sense_reason_t 409de103c93SChristoph Hellwig iblock_execute_sync_cache(struct se_cmd *cmd) 410c66ac9dbSNicholas Bellinger { 4110fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); 412a1d8b49aSAndy Grover int immed = (cmd->t_task_cdb[1] & 0x2); 413df5fa691SChristoph Hellwig struct bio *bio; 414c66ac9dbSNicholas Bellinger 415c66ac9dbSNicholas Bellinger /* 416c66ac9dbSNicholas Bellinger * If the Immediate bit is set, queue up the GOOD response 417df5fa691SChristoph Hellwig * for this SYNCHRONIZE_CACHE op. 418c66ac9dbSNicholas Bellinger */ 419c66ac9dbSNicholas Bellinger if (immed) 4205787cacdSChristoph Hellwig target_complete_cmd(cmd, SAM_STAT_GOOD); 421c66ac9dbSNicholas Bellinger 42207888c66SChristoph Hellwig bio = bio_alloc(ib_dev->ibd_bd, 0, REQ_OP_WRITE | REQ_PREFLUSH, 42307888c66SChristoph Hellwig GFP_KERNEL); 424df5fa691SChristoph Hellwig bio->bi_end_io = iblock_end_io_flush; 425c66ac9dbSNicholas Bellinger if (!immed) 426df5fa691SChristoph Hellwig bio->bi_private = cmd; 4274e49ea4aSMike Christie submit_bio(bio); 428ad67f0d9SChristoph Hellwig return 0; 429c66ac9dbSNicholas Bellinger } 430c66ac9dbSNicholas Bellinger 431de103c93SChristoph Hellwig static sense_reason_t 43262e46942SChristoph Hellwig iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) 433dbc21c5aSAsias He { 43462e46942SChristoph Hellwig struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; 4358a9ebe71SMike Christie struct se_device *dev = cmd->se_dev; 436dbc21c5aSAsias He int ret; 437dbc21c5aSAsias He 4388a9ebe71SMike Christie ret = blkdev_issue_discard(bdev, 4398a9ebe71SMike Christie target_to_linux_sector(dev, lba), 4408a9ebe71SMike Christie target_to_linux_sector(dev, nolb), 44144abff2cSChristoph Hellwig GFP_KERNEL); 442dbc21c5aSAsias He if (ret < 0) { 443dbc21c5aSAsias He pr_err("blkdev_issue_discard() failed: %d\n", ret); 444dbc21c5aSAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 445dbc21c5aSAsias He } 446dbc21c5aSAsias He 447dbc21c5aSAsias He return 0; 448dbc21c5aSAsias He } 449dbc21c5aSAsias He 450dbc21c5aSAsias He static sense_reason_t 4512237498fSNicholas Bellinger iblock_execute_zero_out(struct block_device *bdev, struct se_cmd *cmd) 45207b63196SMike Christie { 45307b63196SMike Christie struct se_device *dev = cmd->se_dev; 45407b63196SMike Christie struct scatterlist *sg = &cmd->t_data_sg[0]; 455f5957dadSBryant G Ly unsigned char *buf, *not_zero; 456f5957dadSBryant G Ly int ret; 45707b63196SMike Christie 4582237498fSNicholas Bellinger buf = kmap(sg_page(sg)) + sg->offset; 4592237498fSNicholas Bellinger if (!buf) 4602237498fSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4612237498fSNicholas Bellinger /* 4622237498fSNicholas Bellinger * Fall back to block_execute_write_same() slow-path if 4632237498fSNicholas Bellinger * incoming WRITE_SAME payload does not contain zeros. 4642237498fSNicholas Bellinger */ 465f5957dadSBryant G Ly not_zero = memchr_inv(buf, 0x00, cmd->data_length); 4662237498fSNicholas Bellinger kunmap(sg_page(sg)); 46707b63196SMike Christie 468f5957dadSBryant G Ly if (not_zero) 4692237498fSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 4702237498fSNicholas Bellinger 4712237498fSNicholas Bellinger ret = blkdev_issue_zeroout(bdev, 47207b63196SMike Christie target_to_linux_sector(dev, cmd->t_task_lba), 47307b63196SMike Christie target_to_linux_sector(dev, 47407b63196SMike Christie sbc_get_write_same_sectors(cmd)), 4751d2ff149SDavid Disseldorp GFP_KERNEL, BLKDEV_ZERO_NOUNMAP); 47607b63196SMike Christie if (ret) 47707b63196SMike Christie return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 47807b63196SMike Christie 47914b40c1eSHannes Reinecke target_complete_cmd(cmd, SAM_STAT_GOOD); 48007b63196SMike Christie return 0; 48107b63196SMike Christie } 48207b63196SMike Christie 48307b63196SMike Christie static sense_reason_t 484f6970ad3SNicholas Bellinger iblock_execute_write_same(struct se_cmd *cmd) 485f6970ad3SNicholas Bellinger { 48607b63196SMike Christie struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; 487f6970ad3SNicholas Bellinger struct iblock_req *ibr; 488f6970ad3SNicholas Bellinger struct scatterlist *sg; 489f6970ad3SNicholas Bellinger struct bio *bio; 490f6970ad3SNicholas Bellinger struct bio_list list; 4918a9ebe71SMike Christie struct se_device *dev = cmd->se_dev; 4928a9ebe71SMike Christie sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); 4938a9ebe71SMike Christie sector_t sectors = target_to_linux_sector(dev, 4948a9ebe71SMike Christie sbc_get_write_same_sectors(cmd)); 495f6970ad3SNicholas Bellinger 496afd73f1bSNicholas Bellinger if (cmd->prot_op) { 497afd73f1bSNicholas Bellinger pr_err("WRITE_SAME: Protection information with IBLOCK" 498afd73f1bSNicholas Bellinger " backends not supported\n"); 499afd73f1bSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 500afd73f1bSNicholas Bellinger } 501ccd3f449SMike Christie 502ccd3f449SMike Christie if (!cmd->t_data_nents) 503ccd3f449SMike Christie return TCM_INVALID_CDB_FIELD; 504ccd3f449SMike Christie 505f6970ad3SNicholas Bellinger sg = &cmd->t_data_sg[0]; 506f6970ad3SNicholas Bellinger 507f6970ad3SNicholas Bellinger if (cmd->t_data_nents > 1 || 508f6970ad3SNicholas Bellinger sg->length != cmd->se_dev->dev_attrib.block_size) { 509f6970ad3SNicholas Bellinger pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 510f6970ad3SNicholas Bellinger " block_size: %u\n", cmd->t_data_nents, sg->length, 511f6970ad3SNicholas Bellinger cmd->se_dev->dev_attrib.block_size); 512f6970ad3SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 513f6970ad3SNicholas Bellinger } 514f6970ad3SNicholas Bellinger 5152237498fSNicholas Bellinger if (bdev_write_zeroes_sectors(bdev)) { 5162237498fSNicholas Bellinger if (!iblock_execute_zero_out(bdev, cmd)) 5172237498fSNicholas Bellinger return 0; 5182237498fSNicholas Bellinger } 51907b63196SMike Christie 520f6970ad3SNicholas Bellinger ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); 521f6970ad3SNicholas Bellinger if (!ibr) 522f6970ad3SNicholas Bellinger goto fail; 523f6970ad3SNicholas Bellinger cmd->priv = ibr; 524f6970ad3SNicholas Bellinger 525bc9e0e36SChaitanya Kulkarni bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE); 526f6970ad3SNicholas Bellinger if (!bio) 527f6970ad3SNicholas Bellinger goto fail_free_ibr; 528f6970ad3SNicholas Bellinger 529f6970ad3SNicholas Bellinger bio_list_init(&list); 530f6970ad3SNicholas Bellinger bio_list_add(&list, bio); 531f6970ad3SNicholas Bellinger 5325981c245SElena Reshetova refcount_set(&ibr->pending, 1); 533f6970ad3SNicholas Bellinger 534f6970ad3SNicholas Bellinger while (sectors) { 535f6970ad3SNicholas Bellinger while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) 536f6970ad3SNicholas Bellinger != sg->length) { 537f6970ad3SNicholas Bellinger 538bc9e0e36SChaitanya Kulkarni bio = iblock_get_bio(cmd, block_lba, 1, REQ_OP_WRITE); 539f6970ad3SNicholas Bellinger if (!bio) 540f6970ad3SNicholas Bellinger goto fail_put_bios; 541f6970ad3SNicholas Bellinger 5425981c245SElena Reshetova refcount_inc(&ibr->pending); 543f6970ad3SNicholas Bellinger bio_list_add(&list, bio); 544f6970ad3SNicholas Bellinger } 545f6970ad3SNicholas Bellinger 546f6970ad3SNicholas Bellinger /* Always in 512 byte units for Linux/Block */ 54780b045b3SBart Van Assche block_lba += sg->length >> SECTOR_SHIFT; 5485676234fSRoman Bolshakov sectors -= sg->length >> SECTOR_SHIFT; 549f6970ad3SNicholas Bellinger } 550f6970ad3SNicholas Bellinger 5514e49ea4aSMike Christie iblock_submit_bios(&list); 552f6970ad3SNicholas Bellinger return 0; 553f6970ad3SNicholas Bellinger 554f6970ad3SNicholas Bellinger fail_put_bios: 555f6970ad3SNicholas Bellinger while ((bio = bio_list_pop(&list))) 556f6970ad3SNicholas Bellinger bio_put(bio); 557f6970ad3SNicholas Bellinger fail_free_ibr: 558f6970ad3SNicholas Bellinger kfree(ibr); 559f6970ad3SNicholas Bellinger fail: 560f6970ad3SNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 561f6970ad3SNicholas Bellinger } 562f6970ad3SNicholas Bellinger 563c66ac9dbSNicholas Bellinger enum { 56444bfd018SAndy Grover Opt_udev_path, Opt_readonly, Opt_force, Opt_err 565c66ac9dbSNicholas Bellinger }; 566c66ac9dbSNicholas Bellinger 567c66ac9dbSNicholas Bellinger static match_table_t tokens = { 568c66ac9dbSNicholas Bellinger {Opt_udev_path, "udev_path=%s"}, 56944bfd018SAndy Grover {Opt_readonly, "readonly=%d"}, 570c66ac9dbSNicholas Bellinger {Opt_force, "force=%d"}, 571c66ac9dbSNicholas Bellinger {Opt_err, NULL} 572c66ac9dbSNicholas Bellinger }; 573c66ac9dbSNicholas Bellinger 5740fd97ccfSChristoph Hellwig static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, 575c66ac9dbSNicholas Bellinger const char *page, ssize_t count) 576c66ac9dbSNicholas Bellinger { 5770fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 5786d180253SJesper Juhl char *orig, *ptr, *arg_p, *opts; 579c66ac9dbSNicholas Bellinger substring_t args[MAX_OPT_ARGS]; 58021bca31cSRoland Dreier int ret = 0, token; 58144bfd018SAndy Grover unsigned long tmp_readonly; 582c66ac9dbSNicholas Bellinger 583c66ac9dbSNicholas Bellinger opts = kstrdup(page, GFP_KERNEL); 584c66ac9dbSNicholas Bellinger if (!opts) 585c66ac9dbSNicholas Bellinger return -ENOMEM; 586c66ac9dbSNicholas Bellinger 587c66ac9dbSNicholas Bellinger orig = opts; 588c66ac9dbSNicholas Bellinger 58990c161b6SSebastian Andrzej Siewior while ((ptr = strsep(&opts, ",\n")) != NULL) { 590c66ac9dbSNicholas Bellinger if (!*ptr) 591c66ac9dbSNicholas Bellinger continue; 592c66ac9dbSNicholas Bellinger 593c66ac9dbSNicholas Bellinger token = match_token(ptr, tokens, args); 594c66ac9dbSNicholas Bellinger switch (token) { 595c66ac9dbSNicholas Bellinger case Opt_udev_path: 596c66ac9dbSNicholas Bellinger if (ib_dev->ibd_bd) { 5976708bb27SAndy Grover pr_err("Unable to set udev_path= while" 598c66ac9dbSNicholas Bellinger " ib_dev->ibd_bd exists\n"); 599c66ac9dbSNicholas Bellinger ret = -EEXIST; 600c66ac9dbSNicholas Bellinger goto out; 601c66ac9dbSNicholas Bellinger } 602852b6ed1SNicholas Bellinger if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], 603852b6ed1SNicholas Bellinger SE_UDEV_PATH_LEN) == 0) { 604852b6ed1SNicholas Bellinger ret = -EINVAL; 6056d180253SJesper Juhl break; 6066d180253SJesper Juhl } 6076708bb27SAndy Grover pr_debug("IBLOCK: Referencing UDEV path: %s\n", 608c66ac9dbSNicholas Bellinger ib_dev->ibd_udev_path); 609c66ac9dbSNicholas Bellinger ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; 610c66ac9dbSNicholas Bellinger break; 61144bfd018SAndy Grover case Opt_readonly: 61244bfd018SAndy Grover arg_p = match_strdup(&args[0]); 61344bfd018SAndy Grover if (!arg_p) { 61444bfd018SAndy Grover ret = -ENOMEM; 61544bfd018SAndy Grover break; 61644bfd018SAndy Grover } 61757103d7fSJingoo Han ret = kstrtoul(arg_p, 0, &tmp_readonly); 61844bfd018SAndy Grover kfree(arg_p); 61944bfd018SAndy Grover if (ret < 0) { 62057103d7fSJingoo Han pr_err("kstrtoul() failed for" 62144bfd018SAndy Grover " readonly=\n"); 62244bfd018SAndy Grover goto out; 62344bfd018SAndy Grover } 62444bfd018SAndy Grover ib_dev->ibd_readonly = tmp_readonly; 62544bfd018SAndy Grover pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); 62644bfd018SAndy Grover break; 627c66ac9dbSNicholas Bellinger case Opt_force: 628c66ac9dbSNicholas Bellinger break; 629c66ac9dbSNicholas Bellinger default: 630c66ac9dbSNicholas Bellinger break; 631c66ac9dbSNicholas Bellinger } 632c66ac9dbSNicholas Bellinger } 633c66ac9dbSNicholas Bellinger 634c66ac9dbSNicholas Bellinger out: 635c66ac9dbSNicholas Bellinger kfree(orig); 636c66ac9dbSNicholas Bellinger return (!ret) ? count : ret; 637c66ac9dbSNicholas Bellinger } 638c66ac9dbSNicholas Bellinger 6390fd97ccfSChristoph Hellwig static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) 640c66ac9dbSNicholas Bellinger { 6410fd97ccfSChristoph Hellwig struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 6420fd97ccfSChristoph Hellwig struct block_device *bd = ib_dev->ibd_bd; 643c66ac9dbSNicholas Bellinger ssize_t bl = 0; 644c66ac9dbSNicholas Bellinger 645c66ac9dbSNicholas Bellinger if (bd) 6461b74ab77SChristoph Hellwig bl += sprintf(b + bl, "iBlock device: %pg", bd); 6470fd97ccfSChristoph Hellwig if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) 64844bfd018SAndy Grover bl += sprintf(b + bl, " UDEV PATH: %s", 6490fd97ccfSChristoph Hellwig ib_dev->ibd_udev_path); 6500fd97ccfSChristoph Hellwig bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); 651c66ac9dbSNicholas Bellinger 652c66ac9dbSNicholas Bellinger bl += sprintf(b + bl, " "); 653c66ac9dbSNicholas Bellinger if (bd) { 654c66ac9dbSNicholas Bellinger bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", 65557ba1059SChristoph Hellwig MAJOR(bd->bd_dev), MINOR(bd->bd_dev), 65657ba1059SChristoph Hellwig "CLAIMED: IBLOCK"); 657c66ac9dbSNicholas Bellinger } else { 65821bca31cSRoland Dreier bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); 659c66ac9dbSNicholas Bellinger } 660c66ac9dbSNicholas Bellinger 661c66ac9dbSNicholas Bellinger return bl; 662c66ac9dbSNicholas Bellinger } 663c66ac9dbSNicholas Bellinger 664ecebbf6cSNicholas Bellinger static int 665fed564f6SGreg Edwards iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio, 666fed564f6SGreg Edwards struct sg_mapping_iter *miter) 667ecebbf6cSNicholas Bellinger { 668ecebbf6cSNicholas Bellinger struct se_device *dev = cmd->se_dev; 669ecebbf6cSNicholas Bellinger struct blk_integrity *bi; 670ecebbf6cSNicholas Bellinger struct bio_integrity_payload *bip; 671ecebbf6cSNicholas Bellinger struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 672fed564f6SGreg Edwards int rc; 673fed564f6SGreg Edwards size_t resid, len; 674ecebbf6cSNicholas Bellinger 675ecebbf6cSNicholas Bellinger bi = bdev_get_integrity(ib_dev->ibd_bd); 676ecebbf6cSNicholas Bellinger if (!bi) { 677ecebbf6cSNicholas Bellinger pr_err("Unable to locate bio_integrity\n"); 678ecebbf6cSNicholas Bellinger return -ENODEV; 679ecebbf6cSNicholas Bellinger } 680ecebbf6cSNicholas Bellinger 6815f7136dbSMatthew Wilcox (Oracle) bip = bio_integrity_alloc(bio, GFP_NOIO, bio_max_segs(cmd->t_prot_nents)); 68206c1e390SKeith Busch if (IS_ERR(bip)) { 683ecebbf6cSNicholas Bellinger pr_err("Unable to allocate bio_integrity_payload\n"); 68406c1e390SKeith Busch return PTR_ERR(bip); 685ecebbf6cSNicholas Bellinger } 686ecebbf6cSNicholas Bellinger 687fed564f6SGreg Edwards bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio)); 688e4dc9a4cSIsrael Rukshin /* virtual start sector must be in integrity interval units */ 689e4dc9a4cSIsrael Rukshin bip_set_seed(bip, bio->bi_iter.bi_sector >> 690e4dc9a4cSIsrael Rukshin (bi->interval_exp - SECTOR_SHIFT)); 691ecebbf6cSNicholas Bellinger 6924e13c5d0SLinus Torvalds pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, 6934e13c5d0SLinus Torvalds (unsigned long long)bip->bip_iter.bi_sector); 694ecebbf6cSNicholas Bellinger 695fed564f6SGreg Edwards resid = bip->bip_iter.bi_size; 696fed564f6SGreg Edwards while (resid > 0 && sg_miter_next(miter)) { 697ecebbf6cSNicholas Bellinger 698fed564f6SGreg Edwards len = min_t(size_t, miter->length, resid); 699fed564f6SGreg Edwards rc = bio_integrity_add_page(bio, miter->page, len, 700fed564f6SGreg Edwards offset_in_page(miter->addr)); 701fed564f6SGreg Edwards if (rc != len) { 702ecebbf6cSNicholas Bellinger pr_err("bio_integrity_add_page() failed; %d\n", rc); 703fed564f6SGreg Edwards sg_miter_stop(miter); 704ecebbf6cSNicholas Bellinger return -ENOMEM; 705ecebbf6cSNicholas Bellinger } 706ecebbf6cSNicholas Bellinger 707fed564f6SGreg Edwards pr_debug("Added bio integrity page: %p length: %zu offset: %lu\n", 708fed564f6SGreg Edwards miter->page, len, offset_in_page(miter->addr)); 709fed564f6SGreg Edwards 710fed564f6SGreg Edwards resid -= len; 711fed564f6SGreg Edwards if (len < miter->length) 712fed564f6SGreg Edwards miter->consumed -= miter->length - len; 713ecebbf6cSNicholas Bellinger } 714fed564f6SGreg Edwards sg_miter_stop(miter); 715ecebbf6cSNicholas Bellinger 716ecebbf6cSNicholas Bellinger return 0; 717ecebbf6cSNicholas Bellinger } 718ecebbf6cSNicholas Bellinger 719de103c93SChristoph Hellwig static sense_reason_t 720a82a9538SNicholas Bellinger iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 721a82a9538SNicholas Bellinger enum dma_data_direction data_direction) 722c66ac9dbSNicholas Bellinger { 7235951146dSAndy Grover struct se_device *dev = cmd->se_dev; 7248a9ebe71SMike Christie sector_t block_lba = target_to_linux_sector(dev, cmd->t_task_lba); 7255787cacdSChristoph Hellwig struct iblock_req *ibr; 726fed564f6SGreg Edwards struct bio *bio; 727dbbf3e94SChristoph Hellwig struct bio_list list; 728c66ac9dbSNicholas Bellinger struct scatterlist *sg; 7295787cacdSChristoph Hellwig u32 sg_num = sgl_nents; 73079fe9d7dSBart Van Assche blk_opf_t opf; 731d5b4a21bSChristoph Hellwig unsigned bio_cnt; 732bc9e0e36SChaitanya Kulkarni int i, rc; 733fed564f6SGreg Edwards struct sg_mapping_iter prot_miter; 734bc9e0e36SChaitanya Kulkarni unsigned int miter_dir; 735dbbf3e94SChristoph Hellwig 7365787cacdSChristoph Hellwig if (data_direction == DMA_TO_DEVICE) { 737d0c8b259SNicholas Bellinger struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 738dbbf3e94SChristoph Hellwig /* 73970fd7614SChristoph Hellwig * Force writethrough using REQ_FUA if a volatile write cache 740d0c8b259SNicholas Bellinger * is not enabled, or if initiator set the Force Unit Access bit. 741dbbf3e94SChristoph Hellwig */ 742bc9e0e36SChaitanya Kulkarni opf = REQ_OP_WRITE; 743bc9e0e36SChaitanya Kulkarni miter_dir = SG_MITER_TO_SG; 744a557e82eSChristoph Hellwig if (bdev_fua(ib_dev->ibd_bd)) { 745d0c8b259SNicholas Bellinger if (cmd->se_cmd_flags & SCF_FUA) 746bc9e0e36SChaitanya Kulkarni opf |= REQ_FUA; 74708e688fdSChristoph Hellwig else if (!bdev_write_cache(ib_dev->ibd_bd)) 748bc9e0e36SChaitanya Kulkarni opf |= REQ_FUA; 749d0c8b259SNicholas Bellinger } 750dbbf3e94SChristoph Hellwig } else { 751bc9e0e36SChaitanya Kulkarni opf = REQ_OP_READ; 752bc9e0e36SChaitanya Kulkarni miter_dir = SG_MITER_FROM_SG; 753dbbf3e94SChristoph Hellwig } 754dbbf3e94SChristoph Hellwig 7555787cacdSChristoph Hellwig ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); 7565787cacdSChristoph Hellwig if (!ibr) 7575787cacdSChristoph Hellwig goto fail; 7585787cacdSChristoph Hellwig cmd->priv = ibr; 7595787cacdSChristoph Hellwig 760e0de4457SPaolo Bonzini if (!sgl_nents) { 7615981c245SElena Reshetova refcount_set(&ibr->pending, 1); 762e0de4457SPaolo Bonzini iblock_complete_cmd(cmd); 763e0de4457SPaolo Bonzini return 0; 764e0de4457SPaolo Bonzini } 765e0de4457SPaolo Bonzini 766bc9e0e36SChaitanya Kulkarni bio = iblock_get_bio(cmd, block_lba, sgl_nents, opf); 7675787cacdSChristoph Hellwig if (!bio) 7685787cacdSChristoph Hellwig goto fail_free_ibr; 769c66ac9dbSNicholas Bellinger 770dbbf3e94SChristoph Hellwig bio_list_init(&list); 771dbbf3e94SChristoph Hellwig bio_list_add(&list, bio); 7725787cacdSChristoph Hellwig 7735981c245SElena Reshetova refcount_set(&ibr->pending, 2); 774d5b4a21bSChristoph Hellwig bio_cnt = 1; 775dbbf3e94SChristoph Hellwig 776fed564f6SGreg Edwards if (cmd->prot_type && dev->dev_attrib.pi_prot_type) 777fed564f6SGreg Edwards sg_miter_start(&prot_miter, cmd->t_prot_sg, cmd->t_prot_nents, 778bc9e0e36SChaitanya Kulkarni miter_dir); 779fed564f6SGreg Edwards 7805787cacdSChristoph Hellwig for_each_sg(sgl, sg, sgl_nents, i) { 781dbbf3e94SChristoph Hellwig /* 782dbbf3e94SChristoph Hellwig * XXX: if the length the device accepts is shorter than the 783dbbf3e94SChristoph Hellwig * length of the S/G list entry this will cause and 784dbbf3e94SChristoph Hellwig * endless loop. Better hope no driver uses huge pages. 785dbbf3e94SChristoph Hellwig */ 786dbbf3e94SChristoph Hellwig while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) 787dbbf3e94SChristoph Hellwig != sg->length) { 788fed564f6SGreg Edwards if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 789fed564f6SGreg Edwards rc = iblock_alloc_bip(cmd, bio, &prot_miter); 790fed564f6SGreg Edwards if (rc) 791fed564f6SGreg Edwards goto fail_put_bios; 792fed564f6SGreg Edwards } 793fed564f6SGreg Edwards 794d5b4a21bSChristoph Hellwig if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { 7954e49ea4aSMike Christie iblock_submit_bios(&list); 796d5b4a21bSChristoph Hellwig bio_cnt = 0; 797d5b4a21bSChristoph Hellwig } 798d5b4a21bSChristoph Hellwig 799bc9e0e36SChaitanya Kulkarni bio = iblock_get_bio(cmd, block_lba, sg_num, opf); 8006708bb27SAndy Grover if (!bio) 8015787cacdSChristoph Hellwig goto fail_put_bios; 8025787cacdSChristoph Hellwig 8035981c245SElena Reshetova refcount_inc(&ibr->pending); 804dbbf3e94SChristoph Hellwig bio_list_add(&list, bio); 805d5b4a21bSChristoph Hellwig bio_cnt++; 806c66ac9dbSNicholas Bellinger } 807dbbf3e94SChristoph Hellwig 808c66ac9dbSNicholas Bellinger /* Always in 512 byte units for Linux/Block */ 80980b045b3SBart Van Assche block_lba += sg->length >> SECTOR_SHIFT; 810c66ac9dbSNicholas Bellinger sg_num--; 811c66ac9dbSNicholas Bellinger } 812c66ac9dbSNicholas Bellinger 8136f16ec43SNicholas Bellinger if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 814fed564f6SGreg Edwards rc = iblock_alloc_bip(cmd, bio, &prot_miter); 815ecebbf6cSNicholas Bellinger if (rc) 816ecebbf6cSNicholas Bellinger goto fail_put_bios; 817ecebbf6cSNicholas Bellinger } 818ecebbf6cSNicholas Bellinger 8194e49ea4aSMike Christie iblock_submit_bios(&list); 8205787cacdSChristoph Hellwig iblock_complete_cmd(cmd); 82103e98c9eSNicholas Bellinger return 0; 822dbbf3e94SChristoph Hellwig 8235787cacdSChristoph Hellwig fail_put_bios: 824dbbf3e94SChristoph Hellwig while ((bio = bio_list_pop(&list))) 825c66ac9dbSNicholas Bellinger bio_put(bio); 8265787cacdSChristoph Hellwig fail_free_ibr: 8275787cacdSChristoph Hellwig kfree(ibr); 8285787cacdSChristoph Hellwig fail: 829de103c93SChristoph Hellwig return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 830c66ac9dbSNicholas Bellinger } 831c66ac9dbSNicholas Bellinger 8327f7caf6aSAndy Grover static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) 8337f7caf6aSAndy Grover { 8347f7caf6aSAndy Grover struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 8357f7caf6aSAndy Grover struct block_device *bd = ib_dev->ibd_bd; 8367f7caf6aSAndy Grover int ret; 8377f7caf6aSAndy Grover 8387f7caf6aSAndy Grover ret = bdev_alignment_offset(bd); 8397f7caf6aSAndy Grover if (ret == -1) 8407f7caf6aSAndy Grover return 0; 8417f7caf6aSAndy Grover 8427f7caf6aSAndy Grover /* convert offset-bytes to offset-lbas */ 8437f7caf6aSAndy Grover return ret / bdev_logical_block_size(bd); 8447f7caf6aSAndy Grover } 8457f7caf6aSAndy Grover 8467f7caf6aSAndy Grover static unsigned int iblock_get_lbppbe(struct se_device *dev) 8477f7caf6aSAndy Grover { 8487f7caf6aSAndy Grover struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 8497f7caf6aSAndy Grover struct block_device *bd = ib_dev->ibd_bd; 850c151eddbSChaitanya Kulkarni unsigned int logs_per_phys = 851a2c6c6a3SChaitanya Kulkarni bdev_physical_block_size(bd) / bdev_logical_block_size(bd); 8527f7caf6aSAndy Grover 8537f7caf6aSAndy Grover return ilog2(logs_per_phys); 8547f7caf6aSAndy Grover } 8557f7caf6aSAndy Grover 8567f7caf6aSAndy Grover static unsigned int iblock_get_io_min(struct se_device *dev) 8577f7caf6aSAndy Grover { 8587f7caf6aSAndy Grover struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 8597f7caf6aSAndy Grover struct block_device *bd = ib_dev->ibd_bd; 8607f7caf6aSAndy Grover 8617f7caf6aSAndy Grover return bdev_io_min(bd); 8627f7caf6aSAndy Grover } 8637f7caf6aSAndy Grover 8647f7caf6aSAndy Grover static unsigned int iblock_get_io_opt(struct se_device *dev) 8657f7caf6aSAndy Grover { 8667f7caf6aSAndy Grover struct iblock_dev *ib_dev = IBLOCK_DEV(dev); 8677f7caf6aSAndy Grover struct block_device *bd = ib_dev->ibd_bd; 8687f7caf6aSAndy Grover 8697f7caf6aSAndy Grover return bdev_io_opt(bd); 8707f7caf6aSAndy Grover } 8717f7caf6aSAndy Grover 872*0217da08SMike Christie static struct exec_cmd_ops iblock_exec_cmd_ops = { 8730c2ad7d1SChristoph Hellwig .execute_rw = iblock_execute_rw, 874ad67f0d9SChristoph Hellwig .execute_sync_cache = iblock_execute_sync_cache, 8756f974e8cSChristoph Hellwig .execute_write_same = iblock_execute_write_same, 87614150a6bSChristoph Hellwig .execute_unmap = iblock_execute_unmap, 8770c2ad7d1SChristoph Hellwig }; 8780c2ad7d1SChristoph Hellwig 879de103c93SChristoph Hellwig static sense_reason_t 880de103c93SChristoph Hellwig iblock_parse_cdb(struct se_cmd *cmd) 8810c2ad7d1SChristoph Hellwig { 882*0217da08SMike Christie return sbc_parse_cdb(cmd, &iblock_exec_cmd_ops); 8830c2ad7d1SChristoph Hellwig } 8840c2ad7d1SChristoph Hellwig 885452e2010SRashika Kheria static bool iblock_get_write_cache(struct se_device *dev) 886d0c8b259SNicholas Bellinger { 88708e688fdSChristoph Hellwig return bdev_write_cache(IBLOCK_DEV(dev)->ibd_bd); 888d0c8b259SNicholas Bellinger } 889d0c8b259SNicholas Bellinger 8900a06d430SChristoph Hellwig static const struct target_backend_ops iblock_ops = { 891c66ac9dbSNicholas Bellinger .name = "iblock", 8920fd97ccfSChristoph Hellwig .inquiry_prod = "IBLOCK", 8930fd97ccfSChristoph Hellwig .inquiry_rev = IBLOCK_VERSION, 894c66ac9dbSNicholas Bellinger .owner = THIS_MODULE, 895c66ac9dbSNicholas Bellinger .attach_hba = iblock_attach_hba, 896c66ac9dbSNicholas Bellinger .detach_hba = iblock_detach_hba, 8970fd97ccfSChristoph Hellwig .alloc_device = iblock_alloc_device, 8980fd97ccfSChristoph Hellwig .configure_device = iblock_configure_device, 89992634706SMike Christie .destroy_device = iblock_destroy_device, 900c66ac9dbSNicholas Bellinger .free_device = iblock_free_device, 901d7c382c5SMike Christie .configure_unmap = iblock_configure_unmap, 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