diff options
Diffstat (limited to 'drivers/target/target_core_file.c')
| -rw-r--r-- | drivers/target/target_core_file.c | 962 |
1 files changed, 620 insertions, 342 deletions
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c index 0aaca885668..7d6cddaec52 100644 --- a/drivers/target/target_core_file.c +++ b/drivers/target/target_core_file.c @@ -3,10 +3,7 @@ * * This file contains the Storage Engine <-> FILEIO transport specific functions * - * Copyright (c) 2005 PyX Technologies, Inc. - * Copyright (c) 2005-2006 SBE, Inc. All Rights Reserved. - * Copyright (c) 2007-2010 Rising Tide Systems - * Copyright (c) 2008-2010 Linux-iSCSI.org + * (c) Copyright 2005-2013 Datera, Inc. * * Nicholas A. Bellinger <nab@kernel.org> * @@ -26,36 +23,27 @@ * ******************************************************************************/ -#include <linux/version.h> #include <linux/string.h> #include <linux/parser.h> #include <linux/timer.h> #include <linux/blkdev.h> #include <linux/slab.h> #include <linux/spinlock.h> -#include <linux/smp_lock.h> +#include <linux/module.h> +#include <linux/falloc.h> #include <scsi/scsi.h> #include <scsi/scsi_host.h> +#include <asm/unaligned.h> #include <target/target_core_base.h> -#include <target/target_core_device.h> -#include <target/target_core_transport.h> +#include <target/target_core_backend.h> #include "target_core_file.h" -#if 1 -#define DEBUG_FD_CACHE(x...) printk(x) -#else -#define DEBUG_FD_CACHE(x...) -#endif - -#if 1 -#define DEBUG_FD_FUA(x...) printk(x) -#else -#define DEBUG_FD_FUA(x...) -#endif - -static struct se_subsystem_api fileio_template; +static inline struct fd_dev *FD_DEV(struct se_device *dev) +{ + return container_of(dev, struct fd_dev, dev); +} /* fd_attach_hba(): (Part of se_subsystem_api_t template) * @@ -66,24 +54,20 @@ static int fd_attach_hba(struct se_hba *hba, u32 host_id) struct fd_host *fd_host; fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); - if (!(fd_host)) { - printk(KERN_ERR "Unable to allocate memory for struct fd_host\n"); - return -1; + if (!fd_host) { + pr_err("Unable to allocate memory for struct fd_host\n"); + return -ENOMEM; } fd_host->fd_host_id = host_id; - atomic_set(&hba->left_queue_depth, FD_HBA_QUEUE_DEPTH); - atomic_set(&hba->max_queue_depth, FD_HBA_QUEUE_DEPTH); - hba->hba_ptr = (void *) fd_host; + hba->hba_ptr = fd_host; - printk(KERN_INFO "CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" + pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" " Target Core Stack %s\n", hba->hba_id, FD_VERSION, TARGET_CORE_MOD_VERSION); - printk(KERN_INFO "CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic" - " Target Core with TCQ Depth: %d MaxSectors: %u\n", - hba->hba_id, fd_host->fd_host_id, - atomic_read(&hba->max_queue_depth), FD_MAX_SECTORS); + pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n", + hba->hba_id, fd_host->fd_host_id); return 0; } @@ -92,83 +76,68 @@ static void fd_detach_hba(struct se_hba *hba) { struct fd_host *fd_host = hba->hba_ptr; - printk(KERN_INFO "CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" + pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" " Target Core\n", hba->hba_id, fd_host->fd_host_id); kfree(fd_host); hba->hba_ptr = NULL; } -static void *fd_allocate_virtdevice(struct se_hba *hba, const char *name) +static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name) { struct fd_dev *fd_dev; - struct fd_host *fd_host = (struct fd_host *) hba->hba_ptr; + struct fd_host *fd_host = hba->hba_ptr; fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); - if (!(fd_dev)) { - printk(KERN_ERR "Unable to allocate memory for struct fd_dev\n"); + if (!fd_dev) { + pr_err("Unable to allocate memory for struct fd_dev\n"); return NULL; } fd_dev->fd_host = fd_host; - printk(KERN_INFO "FILEIO: Allocated fd_dev for %p\n", name); + pr_debug("FILEIO: Allocated fd_dev for %p\n", name); - return fd_dev; + return &fd_dev->dev; } -/* fd_create_virtdevice(): (Part of se_subsystem_api_t template) - * - * - */ -static struct se_device *fd_create_virtdevice( - struct se_hba *hba, - struct se_subsystem_dev *se_dev, - void *p) +static int fd_configure_device(struct se_device *dev) { - char *dev_p = NULL; - struct se_device *dev; - struct se_dev_limits dev_limits; - struct queue_limits *limits; - struct fd_dev *fd_dev = (struct fd_dev *) p; - struct fd_host *fd_host = (struct fd_host *) hba->hba_ptr; - mm_segment_t old_fs; + struct fd_dev *fd_dev = FD_DEV(dev); + struct fd_host *fd_host = dev->se_hba->hba_ptr; struct file *file; struct inode *inode = NULL; - int dev_flags = 0, flags; - - memset(&dev_limits, 0, sizeof(struct se_dev_limits)); - - old_fs = get_fs(); - set_fs(get_ds()); - dev_p = getname(fd_dev->fd_dev_name); - set_fs(old_fs); + int flags, ret = -EINVAL; - if (IS_ERR(dev_p)) { - printk(KERN_ERR "getname(%s) failed: %lu\n", - fd_dev->fd_dev_name, IS_ERR(dev_p)); - goto fail; + if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { + pr_err("Missing fd_dev_name=\n"); + return -EINVAL; } -#if 0 - if (di->no_create_file) - flags = O_RDWR | O_LARGEFILE; - else - flags = O_RDWR | O_CREAT | O_LARGEFILE; -#else - flags = O_RDWR | O_CREAT | O_LARGEFILE; -#endif -/* flags |= O_DIRECT; */ + /* - * If fd_buffered_io=1 has not been set explictly (the default), - * use O_SYNC to force FILEIO writes to disk. + * Use O_DSYNC by default instead of O_SYNC to forgo syncing + * of pure timestamp updates. */ - if (!(fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO)) - flags |= O_SYNC; + flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; - file = filp_open(dev_p, flags, 0600); + /* + * Optionally allow fd_buffered_io=1 to be enabled for people + * who want use the fs buffer cache as an WriteCache mechanism. + * + * This means that in event of a hard failure, there is a risk + * of silent data-loss if the SCSI client has *not* performed a + * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE + * to write-out the entire device cache. + */ + if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { + pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n"); + flags &= ~O_DSYNC; + } - if (IS_ERR(file) || !file || !file->f_dentry) { - printk(KERN_ERR "filp_open(%s) failed\n", dev_p); + file = filp_open(fd_dev->fd_dev_name, flags, 0600); + if (IS_ERR(file)) { + pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); + ret = PTR_ERR(file); goto fail; } fd_dev->fd_file = file; @@ -180,78 +149,105 @@ static struct se_device *fd_create_virtdevice( */ inode = file->f_mapping->host; if (S_ISBLK(inode->i_mode)) { - struct request_queue *q; - /* - * 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(inode->i_bdev); - limits = &dev_limits.limits; - limits->logical_block_size = bdev_logical_block_size(inode->i_bdev); - limits->max_hw_sectors = queue_max_hw_sectors(q); - limits->max_sectors = queue_max_sectors(q); + struct request_queue *q = bdev_get_queue(inode->i_bdev); + unsigned long long dev_size; + + fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); /* * Determine the number of bytes from i_size_read() minus * one (1) logical sector from underlying struct block_device */ - fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); - fd_dev->fd_dev_size = (i_size_read(file->f_mapping->host) - + dev_size = (i_size_read(file->f_mapping->host) - fd_dev->fd_block_size); - printk(KERN_INFO "FILEIO: Using size: %llu bytes from struct" + pr_debug("FILEIO: Using size: %llu bytes from struct" " block_device blocks: %llu logical_block_size: %d\n", - fd_dev->fd_dev_size, - div_u64(fd_dev->fd_dev_size, fd_dev->fd_block_size), + dev_size, div_u64(dev_size, fd_dev->fd_block_size), fd_dev->fd_block_size); + /* + * 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 + */ + if (blk_queue_discard(q)) { + dev->dev_attrib.max_unmap_lba_count = + q->limits.max_discard_sectors; + /* + * Currently hardcoded to 1 in Linux/SCSI code.. + */ + dev->dev_attrib.max_unmap_block_desc_count = 1; + dev->dev_attrib.unmap_granularity = + q->limits.discard_granularity >> 9; + dev->dev_attrib.unmap_granularity_alignment = + q->limits.discard_alignment; + pr_debug("IFILE: BLOCK Discard support available," + " disabled by default\n"); + } + /* + * Enable write same emulation for IBLOCK and use 0xFFFF as + * the smaller WRITE_SAME(10) only has a two-byte block count. + */ + dev->dev_attrib.max_write_same_len = 0xFFFF; + + if (blk_queue_nonrot(q)) + dev->dev_attrib.is_nonrot = 1; } else { if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { - printk(KERN_ERR "FILEIO: Missing fd_dev_size=" + pr_err("FILEIO: Missing fd_dev_size=" " parameter, and no backing struct" " block_device\n"); goto fail; } - limits = &dev_limits.limits; - limits->logical_block_size = FD_BLOCKSIZE; - limits->max_hw_sectors = FD_MAX_SECTORS; - limits->max_sectors = FD_MAX_SECTORS; fd_dev->fd_block_size = FD_BLOCKSIZE; + /* + * Limit UNMAP emulation to 8k Number of LBAs (NoLB) + */ + dev->dev_attrib.max_unmap_lba_count = 0x2000; + /* + * Currently hardcoded to 1 in Linux/SCSI code.. + */ + dev->dev_attrib.max_unmap_block_desc_count = 1; + dev->dev_attrib.unmap_granularity = 1; + dev->dev_attrib.unmap_granularity_alignment = 0; + + /* + * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) + * based upon struct iovec limit for vfs_writev() + */ + dev->dev_attrib.max_write_same_len = 0x1000; } - dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; - dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH; + dev->dev_attrib.hw_block_size = fd_dev->fd_block_size; + dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES; + dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size; + dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; - dev = transport_add_device_to_core_hba(hba, &fileio_template, - se_dev, dev_flags, (void *)fd_dev, - &dev_limits, "FILEIO", FD_VERSION); - if (!(dev)) - goto fail; + if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { + pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" + " with FDBD_HAS_BUFFERED_IO_WCE\n"); + dev->dev_attrib.emulate_write_cache = 1; + } fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; fd_dev->fd_queue_depth = dev->queue_depth; - printk(KERN_INFO "CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," + pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, fd_dev->fd_dev_name, fd_dev->fd_dev_size); - putname(dev_p); - return dev; + return 0; fail: if (fd_dev->fd_file) { filp_close(fd_dev->fd_file, NULL); fd_dev->fd_file = NULL; } - putname(dev_p); - return NULL; + return ret; } -/* fd_free_device(): (Part of se_subsystem_api_t template) - * - * - */ -static void fd_free_device(void *p) +static void fd_free_device(struct se_device *dev) { - struct fd_dev *fd_dev = (struct fd_dev *) p; + struct fd_dev *fd_dev = FD_DEV(dev); if (fd_dev->fd_file) { filp_close(fd_dev->fd_file, NULL); @@ -261,120 +257,145 @@ static void fd_free_device(void *p) kfree(fd_dev); } -static inline struct fd_request *FILE_REQ(struct se_task *task) -{ - return container_of(task, struct fd_request, fd_task); -} - - -static struct se_task * -fd_alloc_task(struct se_cmd *cmd) +static int fd_do_prot_rw(struct se_cmd *cmd, struct fd_prot *fd_prot, + int is_write) { - struct fd_request *fd_req; - - fd_req = kzalloc(sizeof(struct fd_request), GFP_KERNEL); - if (!(fd_req)) { - printk(KERN_ERR "Unable to allocate struct fd_request\n"); - return NULL; - } - - fd_req->fd_dev = SE_DEV(cmd)->dev_ptr; - - return &fd_req->fd_task; -} - -static int fd_do_readv(struct se_task *task) -{ - struct fd_request *req = FILE_REQ(task); - struct file *fd = req->fd_dev->fd_file; - struct scatterlist *sg = task->task_sg; - struct iovec *iov; - mm_segment_t old_fs; - loff_t pos = (task->task_lba * DEV_ATTRIB(task->se_dev)->block_size); - int ret = 0, i; + struct se_device *se_dev = cmd->se_dev; + struct fd_dev *dev = FD_DEV(se_dev); + struct file *prot_fd = dev->fd_prot_file; + struct scatterlist *sg; + loff_t pos = (cmd->t_task_lba * se_dev->prot_length); + unsigned char *buf; + u32 prot_size, len, size; + int rc, ret = 1, i; + + prot_size = (cmd->data_length / se_dev->dev_attrib.block_size) * + se_dev->prot_length; + + if (!is_write) { + fd_prot->prot_buf = vzalloc(prot_size); + if (!fd_prot->prot_buf) { + pr_err("Unable to allocate fd_prot->prot_buf\n"); + return -ENOMEM; + } + buf = fd_prot->prot_buf; + + fd_prot->prot_sg_nents = cmd->t_prot_nents; + fd_prot->prot_sg = kzalloc(sizeof(struct scatterlist) * + fd_prot->prot_sg_nents, GFP_KERNEL); + if (!fd_prot->prot_sg) { + pr_err("Unable to allocate fd_prot->prot_sg\n"); + vfree(fd_prot->prot_buf); + return -ENOMEM; + } + size = prot_size; - iov = kzalloc(sizeof(struct iovec) * task->task_sg_num, GFP_KERNEL); - if (!(iov)) { - printk(KERN_ERR "Unable to allocate fd_do_readv iov[]\n"); - return -1; - } + for_each_sg(fd_prot->prot_sg, sg, fd_prot->prot_sg_nents, i) { - for (i = 0; i < task->task_sg_num; i++) { - iov[i].iov_len = sg[i].length; - iov[i].iov_base = sg_virt(&sg[i]); + len = min_t(u32, PAGE_SIZE, size); + sg_set_buf(sg, buf, len); + size -= len; + buf += len; + } } - old_fs = get_fs(); - set_fs(get_ds()); - ret = vfs_readv(fd, &iov[0], task->task_sg_num, &pos); - set_fs(old_fs); - - kfree(iov); - /* - * Return zeros and GOOD status even if the READ did not return - * the expected virt_size for struct file w/o a backing struct - * block_device. - */ - if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) { - if (ret < 0 || ret != task->task_size) { - printk(KERN_ERR "vfs_readv() returned %d," - " expecting %d for S_ISBLK\n", ret, - (int)task->task_size); - return -1; + if (is_write) { + rc = kernel_write(prot_fd, fd_prot->prot_buf, prot_size, pos); + if (rc < 0 || prot_size != rc) { + pr_err("kernel_write() for fd_do_prot_rw failed:" + " %d\n", rc); + ret = -EINVAL; } } else { - if (ret < 0) { - printk(KERN_ERR "vfs_readv() returned %d for non" - " S_ISBLK\n", ret); - return -1; + rc = kernel_read(prot_fd, pos, fd_prot->prot_buf, prot_size); + if (rc < 0) { + pr_err("kernel_read() for fd_do_prot_rw failed:" + " %d\n", rc); + ret = -EINVAL; } } - return 1; + if (is_write || ret < 0) { + kfree(fd_prot->prot_sg); + vfree(fd_prot->prot_buf); + } + + return ret; } -static int fd_do_writev(struct se_task *task) +static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl, + u32 sgl_nents, int is_write) { - struct fd_request *req = FILE_REQ(task); - struct file *fd = req->fd_dev->fd_file; - struct scatterlist *sg = task->task_sg; + struct se_device *se_dev = cmd->se_dev; + struct fd_dev *dev = FD_DEV(se_dev); + struct file *fd = dev->fd_file; + struct scatterlist *sg; struct iovec *iov; mm_segment_t old_fs; - loff_t pos = (task->task_lba * DEV_ATTRIB(task->se_dev)->block_size); - int ret, i = 0; + loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size); + int ret = 0, i; - iov = kzalloc(sizeof(struct iovec) * task->task_sg_num, GFP_KERNEL); - if (!(iov)) { - printk(KERN_ERR "Unable to allocate fd_do_writev iov[]\n"); - return -1; + iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); + if (!iov) { + pr_err("Unable to allocate fd_do_readv iov[]\n"); + return -ENOMEM; } - for (i = 0; i < task->task_sg_num; i++) { - iov[i].iov_len = sg[i].length; - iov[i].iov_base = sg_virt(&sg[i]); + for_each_sg(sgl, sg, sgl_nents, i) { + iov[i].iov_len = sg->length; + iov[i].iov_base = kmap(sg_page(sg)) + sg->offset; } old_fs = get_fs(); set_fs(get_ds()); - ret = vfs_writev(fd, &iov[0], task->task_sg_num, &pos); + + if (is_write) + ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); + else + ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); + set_fs(old_fs); + for_each_sg(sgl, sg, sgl_nents, i) + kunmap(sg_page(sg)); + kfree(iov); - if (ret < 0 || ret != task->task_size) { - printk(KERN_ERR "vfs_writev() returned %d\n", ret); - return -1; + if (is_write) { + if (ret < 0 || ret != cmd->data_length) { + pr_err("%s() write returned %d\n", __func__, ret); + return (ret < 0 ? ret : -EINVAL); + } + } else { + /* + * Return zeros and GOOD status even if the READ did not return + * the expected virt_size for struct file w/o a backing struct + * block_device. + */ + if (S_ISBLK(file_inode(fd)->i_mode)) { + if (ret < 0 || ret != cmd->data_length) { + pr_err("%s() returned %d, expecting %u for " + "S_ISBLK\n", __func__, ret, + cmd->data_length); + return (ret < 0 ? ret : -EINVAL); + } + } else { + if (ret < 0) { + pr_err("%s() returned %d for non S_ISBLK\n", + __func__, ret); + return ret; + } + } } - return 1; } -static void fd_emulate_sync_cache(struct se_task *task) +static sense_reason_t +fd_execute_sync_cache(struct se_cmd *cmd) { - struct se_cmd *cmd = TASK_CMD(task); struct se_device *dev = cmd->se_dev; - struct fd_dev *fd_dev = dev->dev_ptr; - int immed = (cmd->t_task->t_task_cdb[1] & 0x2); + struct fd_dev *fd_dev = FD_DEV(dev); + int immed = (cmd->t_task_cdb[1] & 0x2); loff_t start, end; int ret; @@ -383,16 +404,16 @@ static void fd_emulate_sync_cache(struct se_task *task) * for this SYNCHRONIZE_CACHE op */ if (immed) - transport_complete_sync_cache(cmd, 1); + target_complete_cmd(cmd, SAM_STAT_GOOD); /* * Determine if we will be flushing the entire device. */ - if (cmd->t_task->t_task_lba == 0 && cmd->data_length == 0) { + if (cmd->t_task_lba == 0 && cmd->data_length == 0) { start = 0; end = LLONG_MAX; } else { - start = cmd->t_task->t_task_lba * DEV_ATTRIB(dev)->block_size; + start = cmd->t_task_lba * dev->dev_attrib.block_size; if (cmd->data_length) end = start + cmd->data_length; else @@ -401,106 +422,285 @@ static void fd_emulate_sync_cache(struct se_task *task) ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); if (ret != 0) - printk(KERN_ERR "FILEIO: vfs_fsync_range() failed: %d\n", ret); + pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); + + if (immed) + return 0; + + if (ret) + target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); + else + target_complete_cmd(cmd, SAM_STAT_GOOD); - if (!immed) - transport_complete_sync_cache(cmd, ret == 0); + return 0; } -/* - * Tell TCM Core that we are capable of WriteCache emulation for - * an underlying struct se_device. - */ -static int fd_emulated_write_cache(struct se_device *dev) +static unsigned char * +fd_setup_write_same_buf(struct se_cmd *cmd, struct scatterlist *sg, + unsigned int len) { - return 1; + struct se_device *se_dev = cmd->se_dev; + unsigned int block_size = se_dev->dev_attrib.block_size; + unsigned int i = 0, end; + unsigned char *buf, *p, *kmap_buf; + + buf = kzalloc(min_t(unsigned int, len, PAGE_SIZE), GFP_KERNEL); + if (!buf) { + pr_err("Unable to allocate fd_execute_write_same buf\n"); + return NULL; + } + + kmap_buf = kmap(sg_page(sg)) + sg->offset; + if (!kmap_buf) { + pr_err("kmap() failed in fd_setup_write_same\n"); + kfree(buf); + return NULL; + } + /* + * Fill local *buf to contain multiple WRITE_SAME blocks up to + * min(len, PAGE_SIZE) + */ + p = buf; + end = min_t(unsigned int, len, PAGE_SIZE); + + while (i < end) { + memcpy(p, kmap_buf, block_size); + + i += block_size; + p += block_size; + } + kunmap(sg_page(sg)); + + return buf; } -static int fd_emulated_dpo(struct se_device *dev) +static sense_reason_t +fd_execute_write_same(struct se_cmd *cmd) { + struct se_device *se_dev = cmd->se_dev; + struct fd_dev *fd_dev = FD_DEV(se_dev); + struct file *f = fd_dev->fd_file; + struct scatterlist *sg; + struct iovec *iov; + mm_segment_t old_fs; + sector_t nolb = sbc_get_write_same_sectors(cmd); + loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; + unsigned int len, len_tmp, iov_num; + int i, rc; + unsigned char *buf; + + if (!nolb) { + target_complete_cmd(cmd, SAM_STAT_GOOD); + return 0; + } + sg = &cmd->t_data_sg[0]; + + if (cmd->t_data_nents > 1 || + sg->length != cmd->se_dev->dev_attrib.block_size) { + pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" + " block_size: %u\n", cmd->t_data_nents, sg->length, + cmd->se_dev->dev_attrib.block_size); + return TCM_INVALID_CDB_FIELD; + } + + len = len_tmp = nolb * se_dev->dev_attrib.block_size; + iov_num = DIV_ROUND_UP(len, PAGE_SIZE); + + buf = fd_setup_write_same_buf(cmd, sg, len); + if (!buf) + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + + iov = vzalloc(sizeof(struct iovec) * iov_num); + if (!iov) { + pr_err("Unable to allocate fd_execute_write_same iovecs\n"); + kfree(buf); + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + } + /* + * Map the single fabric received scatterlist block now populated + * in *buf into each iovec for I/O submission. + */ + for (i = 0; i < iov_num; i++) { + iov[i].iov_base = buf; + iov[i].iov_len = min_t(unsigned int, len_tmp, PAGE_SIZE); + len_tmp -= iov[i].iov_len; + } + + old_fs = get_fs(); + set_fs(get_ds()); + rc = vfs_writev(f, &iov[0], iov_num, &pos); + set_fs(old_fs); + + vfree(iov); + kfree(buf); + + if (rc < 0 || rc != len) { + pr_err("vfs_writev() returned %d for write same\n", rc); + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + } + + target_complete_cmd(cmd, SAM_STAT_GOOD); return 0; } -/* - * Tell TCM Core that we will be emulating Forced Unit Access (FUA) for WRITEs - * for TYPE_DISK. - */ -static int fd_emulated_fua_write(struct se_device *dev) -{ - return 1; -} -static int fd_emulated_fua_read(struct se_device *dev) +static sense_reason_t +fd_do_unmap(struct se_cmd *cmd, void *priv, sector_t lba, sector_t nolb) { + struct file *file = priv; + struct inode *inode = file->f_mapping->host; + int ret; + + if (S_ISBLK(inode->i_mode)) { + /* The backend is block device, use discard */ + struct block_device *bdev = inode->i_bdev; + + ret = blkdev_issue_discard(bdev, lba, + nolb, GFP_KERNEL, 0); + if (ret < 0) { + pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", + ret); + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + } + } else { + /* The backend is normal file, use fallocate */ + struct se_device *se_dev = cmd->se_dev; + loff_t pos = lba * se_dev->dev_attrib.block_size; + unsigned int len = nolb * se_dev->dev_attrib.block_size; + int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; + + if (!file->f_op->fallocate) + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + + ret = file->f_op->fallocate(file, mode, pos, len); + if (ret < 0) { + pr_warn("FILEIO: fallocate() failed: %d\n", ret); + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + } + } + return 0; } -/* - * WRITE Force Unit Access (FUA) emulation on a per struct se_task - * LBA range basis.. - */ -static void fd_emulate_write_fua(struct se_cmd *cmd, struct se_task *task) +static sense_reason_t +fd_execute_write_same_unmap(struct se_cmd *cmd) { - struct se_device *dev = cmd->se_dev; - struct fd_dev *fd_dev = dev->dev_ptr; - loff_t start = task->task_lba * DEV_ATTRIB(dev)->block_size; - loff_t end = start + task->task_size; + struct se_device *se_dev = cmd->se_dev; + struct fd_dev *fd_dev = FD_DEV(se_dev); + struct file *file = fd_dev->fd_file; + sector_t lba = cmd->t_task_lba; + sector_t nolb = sbc_get_write_same_sectors(cmd); int ret; - DEBUG_FD_CACHE("FILEIO: FUA WRITE LBA: %llu, bytes: %u\n", - task->task_lba, task->task_size); + if (!nolb) { + target_complete_cmd(cmd, SAM_STAT_GOOD); + return 0; + } - ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); - if (ret != 0) - printk(KERN_ERR "FILEIO: vfs_fsync_range() failed: %d\n", ret); + ret = fd_do_unmap(cmd, file, lba, nolb); + if (ret) + return ret; + + target_complete_cmd(cmd, GOOD); + return 0; } -static int fd_do_task(struct se_task *task) +static sense_reason_t +fd_execute_unmap(struct se_cmd *cmd) +{ + struct file *file = FD_DEV(cmd->se_dev)->fd_file; + + return sbc_execute_unmap(cmd, fd_do_unmap, file); +} + +static sense_reason_t +fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, + enum dma_data_direction data_direction) { - struct se_cmd *cmd = task->task_se_cmd; struct se_device *dev = cmd->se_dev; + struct fd_prot fd_prot; + sense_reason_t rc; int ret = 0; /* * Call vectorized fileio functions to map struct scatterlist * physical memory addresses to struct iovec virtual memory. */ - if (task->task_data_direction == DMA_FROM_DEVICE) { - ret = fd_do_readv(task); + if (data_direction == DMA_FROM_DEVICE) { + memset(&fd_prot, 0, sizeof(struct fd_prot)); + + if (cmd->prot_type) { + ret = fd_do_prot_rw(cmd, &fd_prot, false); + if (ret < 0) + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + } + + ret = fd_do_rw(cmd, sgl, sgl_nents, 0); + + if (ret > 0 && cmd->prot_type) { + u32 sectors = cmd->data_length / dev->dev_attrib.block_size; + + rc = sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, + 0, fd_prot.prot_sg, 0); + if (rc) { + kfree(fd_prot.prot_sg); + vfree(fd_prot.prot_buf); + return rc; + } + kfree(fd_prot.prot_sg); + vfree(fd_prot.prot_buf); + } } else { - ret = fd_do_writev(task); + memset(&fd_prot, 0, sizeof(struct fd_prot)); + + if (cmd->prot_type) { + u32 sectors = cmd->data_length / dev->dev_attrib.block_size; + + ret = fd_do_prot_rw(cmd, &fd_prot, false); + if (ret < 0) + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + + rc = sbc_dif_verify_write(cmd, cmd->t_task_lba, sectors, + 0, fd_prot.prot_sg, 0); + if (rc) { + kfree(fd_prot.prot_sg); + vfree(fd_prot.prot_buf); + return rc; + } + } + ret = fd_do_rw(cmd, sgl, sgl_nents, 1); + /* + * Perform implicit vfs_fsync_range() for fd_do_writev() ops + * for SCSI WRITEs with Forced Unit Access (FUA) set. + * Allow this to happen independent of WCE=0 setting. + */ if (ret > 0 && - DEV_ATTRIB(dev)->emulate_write_cache > 0 && - DEV_ATTRIB(dev)->emulate_fua_write > 0 && - T_TASK(cmd)->t_tasks_fua) { - /* - * We might need to be a bit smarter here - * and return some sense data to let the initiator - * know the FUA WRITE cache sync failed..? - */ - fd_emulate_write_fua(cmd, task); + dev->dev_attrib.emulate_fua_write > 0 && + (cmd->se_cmd_flags & SCF_FUA)) { + struct fd_dev *fd_dev = FD_DEV(dev); + loff_t start = cmd->t_task_lba * + dev->dev_attrib.block_size; + loff_t end = start + cmd->data_length; + + vfs_fsync_range(fd_dev->fd_file, start, end, 1); } + if (ret > 0 && cmd->prot_type) { + ret = fd_do_prot_rw(cmd, &fd_prot, true); + if (ret < 0) + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + } } - if (ret < 0) - return ret; - if (ret) { - task->task_scsi_status = GOOD; - transport_complete_task(task, 1); + if (ret < 0) { + kfree(fd_prot.prot_sg); + vfree(fd_prot.prot_buf); + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } - return PYX_TRANSPORT_SENT_TO_TRANSPORT; -} - -/* fd_free_task(): (Part of se_subsystem_api_t template) - * - * - */ -static void fd_free_task(struct se_task *task) -{ - struct fd_request *req = FILE_REQ(task); - kfree(req); + if (ret) + target_complete_cmd(cmd, SAM_STAT_GOOD); + return 0; } enum { @@ -510,16 +710,14 @@ enum { static match_table_t tokens = { {Opt_fd_dev_name, "fd_dev_name=%s"}, {Opt_fd_dev_size, "fd_dev_size=%s"}, - {Opt_fd_buffered_io, "fd_buffered_id=%d"}, + {Opt_fd_buffered_io, "fd_buffered_io=%d"}, {Opt_err, NULL} }; -static ssize_t fd_set_configfs_dev_params( - struct se_hba *hba, - struct se_subsystem_dev *se_dev, - const char *page, ssize_t count) +static ssize_t fd_set_configfs_dev_params(struct se_device *dev, + const char *page, ssize_t count) { - struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; + struct fd_dev *fd_dev = FD_DEV(dev); char *orig, *ptr, *arg_p, *opts; substring_t args[MAX_OPT_ARGS]; int ret = 0, arg, token; @@ -530,43 +728,51 @@ static ssize_t fd_set_configfs_dev_params( orig = opts; - while ((ptr = strsep(&opts, ",")) != NULL) { + while ((ptr = strsep(&opts, ",\n")) != NULL) { if (!*ptr) continue; token = match_token(ptr, tokens, args); switch (token) { case Opt_fd_dev_name: - snprintf(fd_dev->fd_dev_name, FD_MAX_DEV_NAME, - "%s", match_strdup(&args[0])); - printk(KERN_INFO "FILEIO: Referencing Path: %s\n", + if (match_strlcpy(fd_dev->fd_dev_name, &args[0], + FD_MAX_DEV_NAME) == 0) { + ret = -EINVAL; + break; + } + pr_debug("FILEIO: Referencing Path: %s\n", fd_dev->fd_dev_name); fd_dev->fbd_flags |= FBDF_HAS_PATH; break; case Opt_fd_dev_size: arg_p = match_strdup(&args[0]); - ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); + if (!arg_p) { + ret = -ENOMEM; + break; + } + ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size); + kfree(arg_p); if (ret < 0) { - printk(KERN_ERR "strict_strtoull() failed for" + pr_err("kstrtoull() failed for" " fd_dev_size=\n"); goto out; } - printk(KERN_INFO "FILEIO: Referencing Size: %llu" + pr_debug("FILEIO: Referencing Size: %llu" " bytes\n", fd_dev->fd_dev_size); fd_dev->fbd_flags |= FBDF_HAS_SIZE; break; case Opt_fd_buffered_io: match_int(args, &arg); if (arg != 1) { - printk(KERN_ERR "bogus fd_buffered_io=%d value\n", arg); + pr_err("bogus fd_buffered_io=%d value\n", arg); ret = -EINVAL; goto out; } - printk(KERN_INFO "FILEIO: Using buffered I/O" + pr_debug("FILEIO: Using buffered I/O" " operations for struct fd_dev\n"); - fd_dev->fbd_flags |= FDBD_USE_BUFFERED_IO; + fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; break; default: break; @@ -578,96 +784,168 @@ out: return (!ret) ? count : ret; } -static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) -{ - struct fd_dev *fd_dev = (struct fd_dev *) se_dev->se_dev_su_ptr; - - if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { - printk(KERN_ERR "Missing fd_dev_name=\n"); - return -1; - } - - return 0; -} - -static ssize_t fd_show_configfs_dev_params( - struct se_hba *hba, - struct se_subsystem_dev *se_dev, - char *b) +static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) { - struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; + struct fd_dev *fd_dev = FD_DEV(dev); ssize_t bl = 0; bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", fd_dev->fd_dev_name, fd_dev->fd_dev_size, - (fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO) ? - "Buffered" : "Synchronous"); + (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? + "Buffered-WCE" : "O_DSYNC"); return bl; } -/* fd_get_cdb(): (Part of se_subsystem_api_t template) - * - * - */ -static unsigned char *fd_get_cdb(struct se_task *task) +static sector_t fd_get_blocks(struct se_device *dev) { - struct fd_request *req = FILE_REQ(task); + struct fd_dev *fd_dev = FD_DEV(dev); + struct file *f = fd_dev->fd_file; + struct inode *i = f->f_mapping->host; + unsigned long long dev_size; + /* + * When using a file that references an underlying struct block_device, + * ensure dev_size is always based on the current inode size in order + * to handle underlying block_device resize operations. + */ + if (S_ISBLK(i->i_mode)) + dev_size = i_size_read(i); + else + dev_size = fd_dev->fd_dev_size; - return req->fd_scsi_cdb; + return div_u64(dev_size - dev->dev_attrib.block_size, + dev->dev_attrib.block_size); } -/* fd_get_device_rev(): (Part of se_subsystem_api_t template) - * - * - */ -static u32 fd_get_device_rev(struct se_device *dev) +static int fd_init_prot(struct se_device *dev) { - return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ + struct fd_dev *fd_dev = FD_DEV(dev); + struct file *prot_file, *file = fd_dev->fd_file; + struct inode *inode; + int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; + char buf[FD_MAX_DEV_PROT_NAME]; + + if (!file) { + pr_err("Unable to locate fd_dev->fd_file\n"); + return -ENODEV; + } + + inode = file->f_mapping->host; + if (S_ISBLK(inode->i_mode)) { + pr_err("FILEIO Protection emulation only supported on" + " !S_ISBLK\n"); + return -ENOSYS; + } + + if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) + flags &= ~O_DSYNC; + + snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection", + fd_dev->fd_dev_name); + + prot_file = filp_open(buf, flags, 0600); + if (IS_ERR(prot_file)) { + pr_err("filp_open(%s) failed\n", buf); + ret = PTR_ERR(prot_file); + return ret; + } + fd_dev->fd_prot_file = prot_file; + + return 0; } -/* fd_get_device_type(): (Part of se_subsystem_api_t template) - * - * - */ -static u32 fd_get_device_type(struct se_device *dev) +static int fd_format_prot(struct se_device *dev) { - return TYPE_DISK; + struct fd_dev *fd_dev = FD_DEV(dev); + struct file *prot_fd = fd_dev->fd_prot_file; + sector_t prot_length, prot; + unsigned char *buf; + loff_t pos = 0; + int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size; + int rc, ret = 0, size, len; + + if (!dev->dev_attrib.pi_prot_type) { + pr_err("Unable to format_prot while pi_prot_type == 0\n"); + return -ENODEV; + } + if (!prot_fd) { + pr_err("Unable to locate fd_dev->fd_prot_file\n"); + return -ENODEV; + } + + buf = vzalloc(unit_size); + if (!buf) { + pr_err("Unable to allocate FILEIO prot buf\n"); + return -ENOMEM; + } + prot_length = (dev->transport->get_blocks(dev) + 1) * dev->prot_length; + size = prot_length; + + pr_debug("Using FILEIO prot_length: %llu\n", + (unsigned long long)prot_length); + + memset(buf, 0xff, unit_size); + for (prot = 0; prot < prot_length; prot += unit_size) { + len = min(unit_size, size); + rc = kernel_write(prot_fd, buf, len, pos); + if (rc != len) { + pr_err("vfs_write to prot file failed: %d\n", rc); + ret = -ENODEV; + goto out; + } + pos += len; + size -= len; + } + +out: + vfree(buf); + return ret; } -static sector_t fd_get_blocks(struct se_device *dev) +static void fd_free_prot(struct se_device *dev) { - struct fd_dev *fd_dev = dev->dev_ptr; - unsigned long long blocks_long = div_u64(fd_dev->fd_dev_size, - DEV_ATTRIB(dev)->block_size); + struct fd_dev *fd_dev = FD_DEV(dev); + + if (!fd_dev->fd_prot_file) + return; + + filp_close(fd_dev->fd_prot_file, NULL); + fd_dev->fd_prot_file = NULL; +} - return blocks_long; +static struct sbc_ops fd_sbc_ops = { + .execute_rw = fd_execute_rw, + .execute_sync_cache = fd_execute_sync_cache, + .execute_write_same = fd_execute_write_same, + .execute_write_same_unmap = fd_execute_write_same_unmap, + .execute_unmap = fd_execute_unmap, +}; + +static sense_reason_t +fd_parse_cdb(struct se_cmd *cmd) +{ + return sbc_parse_cdb(cmd, &fd_sbc_ops); } static struct se_subsystem_api fileio_template = { .name = "fileio", + .inquiry_prod = "FILEIO", + .inquiry_rev = FD_VERSION, .owner = THIS_MODULE, .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, .attach_hba = fd_attach_hba, .detach_hba = fd_detach_hba, - .allocate_virtdevice = fd_allocate_virtdevice, - .create_virtdevice = fd_create_virtdevice, + .alloc_device = fd_alloc_device, + .configure_device = fd_configure_device, .free_device = fd_free_device, - .dpo_emulated = fd_emulated_dpo, - .fua_write_emulated = fd_emulated_fua_write, - .fua_read_emulated = fd_emulated_fua_read, - .write_cache_emulated = fd_emulated_write_cache, - .alloc_task = fd_alloc_task, - .do_task = fd_do_task, - .do_sync_cache = fd_emulate_sync_cache, - .free_task = fd_free_task, - .check_configfs_dev_params = fd_check_configfs_dev_params, + .parse_cdb = fd_parse_cdb, .set_configfs_dev_params = fd_set_configfs_dev_params, .show_configfs_dev_params = fd_show_configfs_dev_params, - .get_cdb = fd_get_cdb, - .get_device_rev = fd_get_device_rev, - .get_device_type = fd_get_device_type, + .get_device_type = sbc_get_device_type, .get_blocks = fd_get_blocks, + .init_prot = fd_init_prot, + .format_prot = fd_format_prot, + .free_prot = fd_free_prot, }; static int __init fileio_module_init(void) @@ -675,7 +953,7 @@ static int __init fileio_module_init(void) return transport_subsystem_register(&fileio_template); } -static void fileio_module_exit(void) +static void __exit fileio_module_exit(void) { transport_subsystem_release(&fileio_template); } |