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drivers/target/target_core_iblock.c
17.3 KB
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/******************************************************************************* * Filename: target_core_iblock.c * * This file contains the Storage Engine <-> Linux BlockIO transport * specific functions. * * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc. * Copyright (c) 2005, 2006, 2007 SBE, Inc. * Copyright (c) 2007-2010 Rising Tide Systems * Copyright (c) 2008-2010 Linux-iSCSI.org * * Nicholas A. Bellinger <nab@kernel.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * ******************************************************************************/ |
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#include <linux/string.h> #include <linux/parser.h> #include <linux/timer.h> #include <linux/fs.h> #include <linux/blkdev.h> #include <linux/slab.h> #include <linux/spinlock.h> |
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#include <linux/bio.h> #include <linux/genhd.h> #include <linux/file.h> |
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#include <linux/module.h> |
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#include <scsi/scsi.h> #include <scsi/scsi_host.h> #include <target/target_core_base.h> #include <target/target_core_device.h> #include <target/target_core_transport.h> #include "target_core_iblock.h" |
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static struct se_subsystem_api iblock_template; static void iblock_bio_done(struct bio *, int); /* iblock_attach_hba(): (Part of se_subsystem_api_t template) * * */ static int iblock_attach_hba(struct se_hba *hba, u32 host_id) { struct iblock_hba *ib_host; ib_host = kzalloc(sizeof(struct iblock_hba), GFP_KERNEL); |
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if (!ib_host) { pr_err("Unable to allocate memory for" |
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" struct iblock_hba "); return -ENOMEM; } ib_host->iblock_host_id = host_id; |
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hba->hba_ptr = ib_host; |
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|
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pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
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" Generic Target Core Stack %s ", hba->hba_id, IBLOCK_VERSION, TARGET_CORE_MOD_VERSION); |
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pr_debug("CORE_HBA[%d] - Attached iBlock HBA: %u to Generic ", |
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hba->hba_id, ib_host->iblock_host_id); |
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return 0; } static void iblock_detach_hba(struct se_hba *hba) { struct iblock_hba *ib_host = hba->hba_ptr; |
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pr_debug("CORE_HBA[%d] - Detached iBlock HBA: %u from Generic" |
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" Target Core ", hba->hba_id, ib_host->iblock_host_id); kfree(ib_host); hba->hba_ptr = NULL; } static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name) { struct iblock_dev *ib_dev = NULL; struct iblock_hba *ib_host = hba->hba_ptr; ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); |
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if (!ib_dev) { pr_err("Unable to allocate struct iblock_dev "); |
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return NULL; } ib_dev->ibd_host = ib_host; |
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pr_debug( "IBLOCK: Allocated ib_dev for %s ", name); |
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return ib_dev; } static struct se_device *iblock_create_virtdevice( struct se_hba *hba, struct se_subsystem_dev *se_dev, void *p) { struct iblock_dev *ib_dev = p; struct se_device *dev; struct se_dev_limits dev_limits; struct block_device *bd = NULL; struct request_queue *q; struct queue_limits *limits; u32 dev_flags = 0; |
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int ret = -EINVAL; |
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|
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if (!ib_dev) { pr_err("Unable to locate struct iblock_dev parameter "); |
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return ERR_PTR(ret); |
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} memset(&dev_limits, 0, sizeof(struct se_dev_limits)); /* * These settings need to be made tunable.. */ ib_dev->ibd_bio_set = bioset_create(32, 64); |
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if (!ib_dev->ibd_bio_set) { pr_err("IBLOCK: Unable to create bioset() "); |
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return ERR_PTR(-ENOMEM); |
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} |
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pr_debug("IBLOCK: Created bio_set() "); |
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/* * iblock_check_configfs_dev_params() ensures that ib_dev->ibd_udev_path * must already have been set in order for echo 1 > $HBA/$DEV/enable to run. */ |
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pr_debug( "IBLOCK: Claiming struct block_device: %s ", |
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ib_dev->ibd_udev_path); bd = blkdev_get_by_path(ib_dev->ibd_udev_path, FMODE_WRITE|FMODE_READ|FMODE_EXCL, ib_dev); |
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if (IS_ERR(bd)) { ret = PTR_ERR(bd); |
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goto failed; |
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} |
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/* * Setup the local scope queue_limits from struct request_queue->limits * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. */ q = bdev_get_queue(bd); limits = &dev_limits.limits; limits->logical_block_size = bdev_logical_block_size(bd); limits->max_hw_sectors = queue_max_hw_sectors(q); limits->max_sectors = queue_max_sectors(q); |
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dev_limits.hw_queue_depth = q->nr_requests; dev_limits.queue_depth = q->nr_requests; |
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|
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ib_dev->ibd_bd = bd; dev = transport_add_device_to_core_hba(hba, |
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&iblock_template, se_dev, dev_flags, ib_dev, |
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&dev_limits, "IBLOCK", IBLOCK_VERSION); |
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if (!dev) |
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goto failed; |
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/* * Check if the underlying struct block_device request_queue supports * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM * in ATA and we need to set TPE=1 */ |
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if (blk_queue_discard(q)) { |
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dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = |
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q->limits.max_discard_sectors; /* * Currently hardcoded to 1 in Linux/SCSI code.. */ |
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dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count = 1; dev->se_sub_dev->se_dev_attrib.unmap_granularity = |
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q->limits.discard_granularity; |
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dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = |
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q->limits.discard_alignment; |
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pr_debug("IBLOCK: BLOCK Discard support available," |
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" disabled by default "); } |
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if (blk_queue_nonrot(q)) dev->se_sub_dev->se_dev_attrib.is_nonrot = 1; |
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return dev; failed: if (ib_dev->ibd_bio_set) { bioset_free(ib_dev->ibd_bio_set); ib_dev->ibd_bio_set = NULL; } ib_dev->ibd_bd = NULL; |
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return ERR_PTR(ret); |
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} static void iblock_free_device(void *p) { struct iblock_dev *ib_dev = p; |
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if (ib_dev->ibd_bd != NULL) blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); if (ib_dev->ibd_bio_set != NULL) bioset_free(ib_dev->ibd_bio_set); |
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kfree(ib_dev); } static inline struct iblock_req *IBLOCK_REQ(struct se_task *task) { return container_of(task, struct iblock_req, ib_task); } static struct se_task * |
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iblock_alloc_task(unsigned char *cdb) |
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{ struct iblock_req *ib_req; ib_req = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
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if (!ib_req) { pr_err("Unable to allocate memory for struct iblock_req "); |
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return NULL; } |
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atomic_set(&ib_req->ib_bio_cnt, 0); return &ib_req->ib_task; } static unsigned long long iblock_emulate_read_cap_with_block_size( struct se_device *dev, struct block_device *bd, struct request_queue *q) { unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), bdev_logical_block_size(bd)) - 1); u32 block_size = bdev_logical_block_size(bd); |
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if (block_size == dev->se_sub_dev->se_dev_attrib.block_size) |
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return blocks_long; switch (block_size) { case 4096: |
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switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
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case 2048: blocks_long <<= 1; break; case 1024: blocks_long <<= 2; break; case 512: blocks_long <<= 3; default: break; } break; case 2048: |
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switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
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case 4096: blocks_long >>= 1; break; case 1024: blocks_long <<= 1; break; case 512: blocks_long <<= 2; break; default: break; } break; case 1024: |
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switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
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case 4096: blocks_long >>= 2; break; case 2048: blocks_long >>= 1; break; case 512: blocks_long <<= 1; break; default: break; } break; case 512: |
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switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
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case 4096: blocks_long >>= 3; break; case 2048: blocks_long >>= 2; break; case 1024: blocks_long >>= 1; break; default: break; } break; default: break; } return blocks_long; } |
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static void iblock_end_io_flush(struct bio *bio, int err) { struct se_cmd *cmd = bio->bi_private; if (err) pr_err("IBLOCK: cache flush failed: %d ", err); if (cmd) transport_complete_sync_cache(cmd, err == 0); bio_put(bio); } |
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/* |
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* Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must * always flush the whole cache. |
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*/ static void iblock_emulate_sync_cache(struct se_task *task) { |
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struct se_cmd *cmd = task->task_se_cmd; |
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struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr; |
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int immed = (cmd->t_task_cdb[1] & 0x2); |
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struct bio *bio; |
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/* * If the Immediate bit is set, queue up the GOOD response |
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* for this SYNCHRONIZE_CACHE op. |
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*/ if (immed) transport_complete_sync_cache(cmd, 1); |
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bio = bio_alloc(GFP_KERNEL, 0); bio->bi_end_io = iblock_end_io_flush; bio->bi_bdev = ib_dev->ibd_bd; |
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if (!immed) |
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bio->bi_private = cmd; submit_bio(WRITE_FLUSH, bio); |
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} |
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static int iblock_do_discard(struct se_device *dev, sector_t lba, u32 range) { struct iblock_dev *ibd = dev->dev_ptr; struct block_device *bd = ibd->ibd_bd; int barrier = 0; return blkdev_issue_discard(bd, lba, range, GFP_KERNEL, barrier); } static void iblock_free_task(struct se_task *task) { |
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kfree(IBLOCK_REQ(task)); |
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} enum { Opt_udev_path, Opt_force, Opt_err }; static match_table_t tokens = { {Opt_udev_path, "udev_path=%s"}, {Opt_force, "force=%d"}, {Opt_err, NULL} }; static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev, const char *page, ssize_t count) { struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr; |
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char *orig, *ptr, *arg_p, *opts; |
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substring_t args[MAX_OPT_ARGS]; |
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int ret = 0, token; |
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opts = kstrdup(page, GFP_KERNEL); if (!opts) return -ENOMEM; orig = opts; while ((ptr = strsep(&opts, ",")) != NULL) { if (!*ptr) continue; token = match_token(ptr, tokens, args); switch (token) { case Opt_udev_path: if (ib_dev->ibd_bd) { |
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pr_err("Unable to set udev_path= while" |
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" ib_dev->ibd_bd exists "); ret = -EEXIST; goto out; } |
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arg_p = match_strdup(&args[0]); if (!arg_p) { ret = -ENOMEM; break; } snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN, "%s", arg_p); kfree(arg_p); |
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pr_debug("IBLOCK: Referencing UDEV path: %s ", |
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ib_dev->ibd_udev_path); ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; break; case Opt_force: |
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break; default: break; } } out: kfree(orig); return (!ret) ? count : ret; } static ssize_t iblock_check_configfs_dev_params( struct se_hba *hba, struct se_subsystem_dev *se_dev) { struct iblock_dev *ibd = se_dev->se_dev_su_ptr; if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
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pr_err("Missing udev_path= parameters for IBLOCK "); |
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return -EINVAL; |
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} return 0; } static ssize_t iblock_show_configfs_dev_params( struct se_hba *hba, struct se_subsystem_dev *se_dev, char *b) { struct iblock_dev *ibd = se_dev->se_dev_su_ptr; struct block_device *bd = ibd->ibd_bd; char buf[BDEVNAME_SIZE]; ssize_t bl = 0; if (bd) bl += sprintf(b + bl, "iBlock device: %s", bdevname(bd, buf)); if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) { bl += sprintf(b + bl, " UDEV PATH: %s ", ibd->ibd_udev_path); } else bl += sprintf(b + bl, " "); bl += sprintf(b + bl, " "); if (bd) { bl += sprintf(b + bl, "Major: %d Minor: %d %s ", |
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MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
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"" : (bd->bd_holder == (struct iblock_dev *)ibd) ? "CLAIMED: IBLOCK" : "CLAIMED: OS"); } else { |
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bl += sprintf(b + bl, "Major: 0 Minor: 0 "); |
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} return bl; } static void iblock_bio_destructor(struct bio *bio) { struct se_task *task = bio->bi_private; |
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struct iblock_dev *ib_dev = task->task_se_cmd->se_dev->dev_ptr; |
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bio_free(bio, ib_dev->ibd_bio_set); } |
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static struct bio * iblock_get_bio(struct se_task *task, sector_t lba, u32 sg_num) |
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{ |
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struct iblock_dev *ib_dev = task->task_se_cmd->se_dev->dev_ptr; |
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struct iblock_req *ib_req = IBLOCK_REQ(task); |
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struct bio *bio; bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); |
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if (!bio) { pr_err("Unable to allocate memory for bio "); |
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return NULL; } |
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pr_debug("Allocated bio: %p task_sg_nents: %u using ibd_bio_set:" " %p ", bio, task->task_sg_nents, ib_dev->ibd_bio_set); pr_debug("Allocated bio: %p task_size: %u ", bio, task->task_size); |
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bio->bi_bdev = ib_dev->ibd_bd; |
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bio->bi_private = task; |
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bio->bi_destructor = iblock_bio_destructor; bio->bi_end_io = &iblock_bio_done; bio->bi_sector = lba; atomic_inc(&ib_req->ib_bio_cnt); |
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pr_debug("Set bio->bi_sector: %llu ", (unsigned long long)bio->bi_sector); pr_debug("Set ib_req->ib_bio_cnt: %d ", |
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atomic_read(&ib_req->ib_bio_cnt)); return bio; } |
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static int iblock_do_task(struct se_task *task) |
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{ struct se_cmd *cmd = task->task_se_cmd; |
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struct se_device *dev = cmd->se_dev; |
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struct bio *bio; struct bio_list list; |
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struct scatterlist *sg; |
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u32 i, sg_num = task->task_sg_nents; |
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sector_t block_lba; |
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struct blk_plug plug; int rw; if (task->task_data_direction == DMA_TO_DEVICE) { /* * Force data to disk if we pretend to not have a volatile * write cache, or the initiator set the Force Unit Access bit. */ if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache == 0 || (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && |
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(cmd->se_cmd_flags & SCF_FUA))) |
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rw = WRITE_FUA; else rw = WRITE; } else { rw = READ; } |
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/* * Do starting conversion up from non 512-byte blocksize with * struct se_task SCSI blocksize into Linux/Block 512 units for BIO. */ |
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if (dev->se_sub_dev->se_dev_attrib.block_size == 4096) |
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block_lba = (task->task_lba << 3); |
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551 |
else if (dev->se_sub_dev->se_dev_attrib.block_size == 2048) |
c66ac9db8 [SCSI] target: Ad... |
552 |
block_lba = (task->task_lba << 2); |
e3d6f909e target: Core clea... |
553 |
else if (dev->se_sub_dev->se_dev_attrib.block_size == 1024) |
c66ac9db8 [SCSI] target: Ad... |
554 |
block_lba = (task->task_lba << 1); |
e3d6f909e target: Core clea... |
555 |
else if (dev->se_sub_dev->se_dev_attrib.block_size == 512) |
c66ac9db8 [SCSI] target: Ad... |
556 557 |
block_lba = task->task_lba; else { |
6708bb27b target: Follow up... |
558 |
pr_err("Unsupported SCSI -> BLOCK LBA conversion:" |
e3d6f909e target: Core clea... |
559 560 |
" %u ", dev->se_sub_dev->se_dev_attrib.block_size); |
03e98c9eb target: Address l... |
561 562 |
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; return -ENOSYS; |
c66ac9db8 [SCSI] target: Ad... |
563 |
} |
dbbf3e94c target: cleanup i... |
564 |
bio = iblock_get_bio(task, block_lba, sg_num); |
03e98c9eb target: Address l... |
565 566 567 568 |
if (!bio) { cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; return -ENOMEM; } |
dbbf3e94c target: cleanup i... |
569 570 571 |
bio_list_init(&list); bio_list_add(&list, bio); |
c66ac9db8 [SCSI] target: Ad... |
572 |
|
6708bb27b target: Follow up... |
573 |
for_each_sg(task->task_sg, sg, task->task_sg_nents, i) { |
dbbf3e94c target: cleanup i... |
574 575 576 577 578 579 580 581 |
/* * XXX: if the length the device accepts is shorter than the * length of the S/G list entry this will cause and * endless loop. Better hope no driver uses huge pages. */ while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) != sg->length) { bio = iblock_get_bio(task, block_lba, sg_num); |
6708bb27b target: Follow up... |
582 |
if (!bio) |
c66ac9db8 [SCSI] target: Ad... |
583 |
goto fail; |
dbbf3e94c target: cleanup i... |
584 |
bio_list_add(&list, bio); |
c66ac9db8 [SCSI] target: Ad... |
585 |
} |
dbbf3e94c target: cleanup i... |
586 |
|
c66ac9db8 [SCSI] target: Ad... |
587 588 589 |
/* Always in 512 byte units for Linux/Block */ block_lba += sg->length >> IBLOCK_LBA_SHIFT; sg_num--; |
c66ac9db8 [SCSI] target: Ad... |
590 |
} |
dbbf3e94c target: cleanup i... |
591 592 593 594 |
blk_start_plug(&plug); while ((bio = bio_list_pop(&list))) submit_bio(rw, bio); blk_finish_plug(&plug); |
03e98c9eb target: Address l... |
595 |
return 0; |
dbbf3e94c target: cleanup i... |
596 |
|
c66ac9db8 [SCSI] target: Ad... |
597 |
fail: |
dbbf3e94c target: cleanup i... |
598 |
while ((bio = bio_list_pop(&list))) |
c66ac9db8 [SCSI] target: Ad... |
599 |
bio_put(bio); |
03e98c9eb target: Address l... |
600 601 |
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; return -ENOMEM; |
c66ac9db8 [SCSI] target: Ad... |
602 |
} |
c66ac9db8 [SCSI] target: Ad... |
603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 |
static u32 iblock_get_device_rev(struct se_device *dev) { return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ } static u32 iblock_get_device_type(struct se_device *dev) { return TYPE_DISK; } static sector_t iblock_get_blocks(struct se_device *dev) { struct iblock_dev *ibd = dev->dev_ptr; struct block_device *bd = ibd->ibd_bd; struct request_queue *q = bdev_get_queue(bd); return iblock_emulate_read_cap_with_block_size(dev, bd, q); } static void iblock_bio_done(struct bio *bio, int err) { struct se_task *task = bio->bi_private; struct iblock_req *ibr = IBLOCK_REQ(task); |
dbbf3e94c target: cleanup i... |
626 |
|
c66ac9db8 [SCSI] target: Ad... |
627 628 629 |
/* * Set -EIO if !BIO_UPTODATE and the passed is still err=0 */ |
6708bb27b target: Follow up... |
630 |
if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err) |
c66ac9db8 [SCSI] target: Ad... |
631 632 633 |
err = -EIO; if (err != 0) { |
6708bb27b target: Follow up... |
634 |
pr_err("test_bit(BIO_UPTODATE) failed for bio: %p," |
c66ac9db8 [SCSI] target: Ad... |
635 636 637 638 639 640 641 |
" err: %d ", bio, err); /* * Bump the ib_bio_err_cnt and release bio. */ atomic_inc(&ibr->ib_bio_err_cnt); smp_mb__after_atomic_inc(); |
c66ac9db8 [SCSI] target: Ad... |
642 |
} |
dbbf3e94c target: cleanup i... |
643 |
|
c66ac9db8 [SCSI] target: Ad... |
644 |
bio_put(bio); |
dbbf3e94c target: cleanup i... |
645 |
|
6708bb27b target: Follow up... |
646 |
if (!atomic_dec_and_test(&ibr->ib_bio_cnt)) |
c66ac9db8 [SCSI] target: Ad... |
647 |
return; |
dbbf3e94c target: cleanup i... |
648 649 650 651 652 653 654 |
pr_debug("done[%p] bio: %p task_lba: %llu bio_lba: %llu err=%d ", task, bio, task->task_lba, (unsigned long long)bio->bi_sector, err); transport_complete_task(task, !atomic_read(&ibr->ib_bio_err_cnt)); |
c66ac9db8 [SCSI] target: Ad... |
655 656 657 658 659 660 |
} static struct se_subsystem_api iblock_template = { .name = "iblock", .owner = THIS_MODULE, .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, |
f55918fa3 target: clean up ... |
661 662 |
.write_cache_emulated = 1, .fua_write_emulated = 1, |
c66ac9db8 [SCSI] target: Ad... |
663 664 665 666 667 |
.attach_hba = iblock_attach_hba, .detach_hba = iblock_detach_hba, .allocate_virtdevice = iblock_allocate_virtdevice, .create_virtdevice = iblock_create_virtdevice, .free_device = iblock_free_device, |
c66ac9db8 [SCSI] target: Ad... |
668 669 670 671 672 673 674 675 |
.alloc_task = iblock_alloc_task, .do_task = iblock_do_task, .do_discard = iblock_do_discard, .do_sync_cache = iblock_emulate_sync_cache, .free_task = iblock_free_task, .check_configfs_dev_params = iblock_check_configfs_dev_params, .set_configfs_dev_params = iblock_set_configfs_dev_params, .show_configfs_dev_params = iblock_show_configfs_dev_params, |
c66ac9db8 [SCSI] target: Ad... |
676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 |
.get_device_rev = iblock_get_device_rev, .get_device_type = iblock_get_device_type, .get_blocks = iblock_get_blocks, }; static int __init iblock_module_init(void) { return transport_subsystem_register(&iblock_template); } static void iblock_module_exit(void) { transport_subsystem_release(&iblock_template); } MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); MODULE_AUTHOR("nab@Linux-iSCSI.org"); MODULE_LICENSE("GPL"); module_init(iblock_module_init); module_exit(iblock_module_exit); |