diff options
author | Christoph Hellwig <hch@infradead.org> | 2012-10-08 00:03:19 -0400 |
---|---|---|
committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2012-11-06 20:55:43 -0800 |
commit | 0fd97ccf45be26fb01b3a412f1f6c6b5044b2f16 (patch) | |
tree | c642e3da11e534a311a1e998ef740a3d44b9187b /drivers/target/target_core_iblock.c | |
parent | 3d70f8c617a436c7146ecb81df2265b4626dfe89 (diff) | |
download | op-kernel-dev-0fd97ccf45be26fb01b3a412f1f6c6b5044b2f16.zip op-kernel-dev-0fd97ccf45be26fb01b3a412f1f6c6b5044b2f16.tar.gz |
target: kill struct se_subsystem_dev
Simplify the code a lot by killing the superflous struct se_subsystem_dev.
Instead se_device is allocated early on by the backend driver, which allocates
it as part of its own per-device structure, borrowing the scheme that is for
example used for inode allocation.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_iblock.c')
-rw-r--r-- | drivers/target/target_core_iblock.c | 185 |
1 files changed, 74 insertions, 111 deletions
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c index 57d7674..dd6cd92 100644 --- a/drivers/target/target_core_iblock.c +++ b/drivers/target/target_core_iblock.c @@ -50,6 +50,12 @@ #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ #define IBLOCK_BIO_POOL_SIZE 128 +static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) +{ + return container_of(dev, struct iblock_dev, dev); +} + + static struct se_subsystem_api iblock_template; static void iblock_bio_done(struct bio *, int); @@ -70,7 +76,7 @@ static void iblock_detach_hba(struct se_hba *hba) { } -static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name) +static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name) { struct iblock_dev *ib_dev = NULL; @@ -82,40 +88,28 @@ static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name) pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); - return ib_dev; + return &ib_dev->dev; } -static struct se_device *iblock_create_virtdevice( - struct se_hba *hba, - struct se_subsystem_dev *se_dev, - void *p) +static int iblock_configure_device(struct se_device *dev) { - struct iblock_dev *ib_dev = p; - struct se_device *dev; - struct se_dev_limits dev_limits; - struct block_device *bd = NULL; + struct iblock_dev *ib_dev = IBLOCK_DEV(dev); struct request_queue *q; - struct queue_limits *limits; - u32 dev_flags = 0; + struct block_device *bd = NULL; fmode_t mode; - int ret = -EINVAL; + int ret = -ENOMEM; - if (!ib_dev) { - pr_err("Unable to locate struct iblock_dev parameter\n"); - return ERR_PTR(ret); + if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { + pr_err("Missing udev_path= parameters for IBLOCK\n"); + return -EINVAL; } - memset(&dev_limits, 0, sizeof(struct se_dev_limits)); ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0); if (!ib_dev->ibd_bio_set) { - pr_err("IBLOCK: Unable to create bioset()\n"); - return ERR_PTR(-ENOMEM); + pr_err("IBLOCK: Unable to create bioset\n"); + goto out; } - pr_debug("IBLOCK: Created bio_set()\n"); - /* - * 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. - */ + pr_debug( "IBLOCK: Claiming struct block_device: %s\n", ib_dev->ibd_udev_path); @@ -126,27 +120,15 @@ static struct se_device *iblock_create_virtdevice( bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); if (IS_ERR(bd)) { ret = PTR_ERR(bd); - goto failed; + goto out_free_bioset; } - /* - * 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 = UINT_MAX; - limits->max_sectors = UINT_MAX; - dev_limits.hw_queue_depth = q->nr_requests; - dev_limits.queue_depth = q->nr_requests; - ib_dev->ibd_bd = bd; - dev = transport_add_device_to_core_hba(hba, - &iblock_template, se_dev, dev_flags, ib_dev, - &dev_limits, "IBLOCK", IBLOCK_VERSION); - if (!dev) - goto failed; + q = bdev_get_queue(bd); + + dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); + dev->dev_attrib.hw_max_sectors = UINT_MAX; + dev->dev_attrib.hw_queue_depth = q->nr_requests; /* * Check if the underlying struct block_device request_queue supports @@ -154,15 +136,16 @@ static struct se_device *iblock_create_virtdevice( * in ATA and we need to set TPE=1 */ if (blk_queue_discard(q)) { - dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = + dev->dev_attrib.max_unmap_lba_count = q->limits.max_discard_sectors; + /* * Currently hardcoded to 1 in Linux/SCSI code.. */ - dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count = 1; - dev->se_sub_dev->se_dev_attrib.unmap_granularity = + dev->dev_attrib.max_unmap_block_desc_count = 1; + dev->dev_attrib.unmap_granularity = q->limits.discard_granularity >> 9; - dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = + dev->dev_attrib.unmap_granularity_alignment = q->limits.discard_alignment; pr_debug("IBLOCK: BLOCK Discard support available," @@ -170,22 +153,19 @@ static struct se_device *iblock_create_virtdevice( } if (blk_queue_nonrot(q)) - dev->se_sub_dev->se_dev_attrib.is_nonrot = 1; - - return dev; + dev->dev_attrib.is_nonrot = 1; + return 0; -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; - return ERR_PTR(ret); +out_free_bioset: + bioset_free(ib_dev->ibd_bio_set); + ib_dev->ibd_bio_set = NULL; +out: + return ret; } -static void iblock_free_device(void *p) +static void iblock_free_device(struct se_device *dev) { - struct iblock_dev *ib_dev = p; + struct iblock_dev *ib_dev = IBLOCK_DEV(dev); if (ib_dev->ibd_bd != NULL) blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); @@ -203,12 +183,12 @@ static unsigned long long iblock_emulate_read_cap_with_block_size( bdev_logical_block_size(bd)) - 1); u32 block_size = bdev_logical_block_size(bd); - if (block_size == dev->se_sub_dev->se_dev_attrib.block_size) + if (block_size == dev->dev_attrib.block_size) return blocks_long; switch (block_size) { case 4096: - switch (dev->se_sub_dev->se_dev_attrib.block_size) { + switch (dev->dev_attrib.block_size) { case 2048: blocks_long <<= 1; break; @@ -222,7 +202,7 @@ static unsigned long long iblock_emulate_read_cap_with_block_size( } break; case 2048: - switch (dev->se_sub_dev->se_dev_attrib.block_size) { + switch (dev->dev_attrib.block_size) { case 4096: blocks_long >>= 1; break; @@ -237,7 +217,7 @@ static unsigned long long iblock_emulate_read_cap_with_block_size( } break; case 1024: - switch (dev->se_sub_dev->se_dev_attrib.block_size) { + switch (dev->dev_attrib.block_size) { case 4096: blocks_long >>= 2; break; @@ -252,7 +232,7 @@ static unsigned long long iblock_emulate_read_cap_with_block_size( } break; case 512: - switch (dev->se_sub_dev->se_dev_attrib.block_size) { + switch (dev->dev_attrib.block_size) { case 4096: blocks_long >>= 3; break; @@ -299,7 +279,7 @@ static void iblock_end_io_flush(struct bio *bio, int err) */ static int iblock_execute_sync_cache(struct se_cmd *cmd) { - struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr; + struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); int immed = (cmd->t_task_cdb[1] & 0x2); struct bio *bio; @@ -322,7 +302,7 @@ static int iblock_execute_sync_cache(struct se_cmd *cmd) static int iblock_execute_unmap(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; - struct iblock_dev *ibd = dev->dev_ptr; + struct iblock_dev *ib_dev = IBLOCK_DEV(dev); unsigned char *buf, *ptr = NULL; sector_t lba; int size; @@ -349,7 +329,7 @@ static int iblock_execute_unmap(struct se_cmd *cmd) else size = bd_dl; - if (size / 16 > dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) { + if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; ret = -EINVAL; goto err; @@ -366,7 +346,7 @@ static int iblock_execute_unmap(struct se_cmd *cmd) pr_debug("UNMAP: Using lba: %llu and range: %u\n", (unsigned long long)lba, range); - if (range > dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count) { + if (range > dev->dev_attrib.max_unmap_lba_count) { cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; ret = -EINVAL; goto err; @@ -378,7 +358,7 @@ static int iblock_execute_unmap(struct se_cmd *cmd) goto err; } - ret = blkdev_issue_discard(ibd->ibd_bd, lba, range, + ret = blkdev_issue_discard(ib_dev->ibd_bd, lba, range, GFP_KERNEL, 0); if (ret < 0) { pr_err("blkdev_issue_discard() failed: %d\n", @@ -399,10 +379,10 @@ err: static int iblock_execute_write_same(struct se_cmd *cmd) { - struct iblock_dev *ibd = cmd->se_dev->dev_ptr; + struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); int ret; - ret = blkdev_issue_discard(ibd->ibd_bd, cmd->t_task_lba, + ret = blkdev_issue_discard(ib_dev->ibd_bd, cmd->t_task_lba, spc_get_write_same_sectors(cmd), GFP_KERNEL, 0); if (ret < 0) { @@ -425,11 +405,10 @@ static match_table_t tokens = { {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) +static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, + const char *page, ssize_t count) { - struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr; + struct iblock_dev *ib_dev = IBLOCK_DEV(dev); char *orig, *ptr, *arg_p, *opts; substring_t args[MAX_OPT_ARGS]; int ret = 0, token; @@ -491,43 +470,26 @@ out: 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)) { - pr_err("Missing udev_path= parameters for IBLOCK\n"); - return -EINVAL; - } - - return 0; -} - -static ssize_t iblock_show_configfs_dev_params( - struct se_hba *hba, - struct se_subsystem_dev *se_dev, - char *b) +static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) { - struct iblock_dev *ibd = se_dev->se_dev_su_ptr; - struct block_device *bd = ibd->ibd_bd; + struct iblock_dev *ib_dev = IBLOCK_DEV(dev); + struct block_device *bd = ib_dev->ibd_bd; char buf[BDEVNAME_SIZE]; ssize_t bl = 0; if (bd) bl += sprintf(b + bl, "iBlock device: %s", bdevname(bd, buf)); - if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) + if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) bl += sprintf(b + bl, " UDEV PATH: %s", - ibd->ibd_udev_path); - bl += sprintf(b + bl, " readonly: %d\n", ibd->ibd_readonly); + ib_dev->ibd_udev_path); + bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); bl += sprintf(b + bl, " "); if (bd) { bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? - "" : (bd->bd_holder == ibd) ? + "" : (bd->bd_holder == ib_dev) ? "CLAIMED: IBLOCK" : "CLAIMED: OS"); } else { bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); @@ -556,7 +518,7 @@ static void iblock_complete_cmd(struct se_cmd *cmd) static struct bio * iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num) { - struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr; + struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); struct bio *bio; /* @@ -611,8 +573,8 @@ static int iblock_execute_rw(struct se_cmd *cmd) * 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 && + if (dev->dev_attrib.emulate_write_cache == 0 || + (dev->dev_attrib.emulate_fua_write > 0 && (cmd->se_cmd_flags & SCF_FUA))) rw = WRITE_FUA; else @@ -625,17 +587,17 @@ static int iblock_execute_rw(struct se_cmd *cmd) * Convert the blocksize advertised to the initiator to the 512 byte * units unconditionally used by the Linux block layer. */ - if (dev->se_sub_dev->se_dev_attrib.block_size == 4096) + if (dev->dev_attrib.block_size == 4096) block_lba = (cmd->t_task_lba << 3); - else if (dev->se_sub_dev->se_dev_attrib.block_size == 2048) + else if (dev->dev_attrib.block_size == 2048) block_lba = (cmd->t_task_lba << 2); - else if (dev->se_sub_dev->se_dev_attrib.block_size == 1024) + else if (dev->dev_attrib.block_size == 1024) block_lba = (cmd->t_task_lba << 1); - else if (dev->se_sub_dev->se_dev_attrib.block_size == 512) + else if (dev->dev_attrib.block_size == 512) block_lba = cmd->t_task_lba; else { pr_err("Unsupported SCSI -> BLOCK LBA conversion:" - " %u\n", dev->se_sub_dev->se_dev_attrib.block_size); + " %u\n", dev->dev_attrib.block_size); cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; return -ENOSYS; } @@ -714,8 +676,8 @@ static u32 iblock_get_device_type(struct se_device *dev) 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 iblock_dev *ib_dev = IBLOCK_DEV(dev); + struct block_device *bd = ib_dev->ibd_bd; struct request_queue *q = bdev_get_queue(bd); return iblock_emulate_read_cap_with_block_size(dev, bd, q); @@ -761,15 +723,16 @@ static int iblock_parse_cdb(struct se_cmd *cmd) static struct se_subsystem_api iblock_template = { .name = "iblock", + .inquiry_prod = "IBLOCK", + .inquiry_rev = IBLOCK_VERSION, .owner = THIS_MODULE, .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, .attach_hba = iblock_attach_hba, .detach_hba = iblock_detach_hba, - .allocate_virtdevice = iblock_allocate_virtdevice, - .create_virtdevice = iblock_create_virtdevice, + .alloc_device = iblock_alloc_device, + .configure_device = iblock_configure_device, .free_device = iblock_free_device, .parse_cdb = iblock_parse_cdb, - .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, .get_device_rev = iblock_get_device_rev, |