linux/drivers/target/target_core_file.c
Christoph Hellwig 814e5b4518 target: fix DPO and FUA bit checks
Drivers may override the WCE flag, in which case the DPOFUA flag in
MODE SENSE might differ from the check used to reject invalid FUA
bits in sbc_check_dpofua.  Also now that we reject invalid FUA
bits early there is no need to duplicate the same buggy check
down in the fileio code.

As the DPOFUA flag controls th support for FUA bits on read and
write commands as well as DPO key off all the checks off a single
helper, and deprecate the emulate_dpo and emulate_fua_read attributs.

This fixes various failures in the libiscsi testsuite.

Personally I'd prefer to also remove the emulate_fua_write attribute
as there is no good reason to disable it, but I'll leave that for
a separate discussion.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-05-30 22:41:44 -07:00

925 lines
24 KiB
C

/*******************************************************************************
* Filename: target_core_file.c
*
* This file contains the Storage Engine <-> FILEIO transport specific functions
*
* (c) Copyright 2005-2013 Datera, Inc.
*
* 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.
*
******************************************************************************/
#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/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_backend.h>
#include <target/target_core_backend_configfs.h>
#include "target_core_file.h"
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)
*
*
*/
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) {
pr_err("Unable to allocate memory for struct fd_host\n");
return -ENOMEM;
}
fd_host->fd_host_id = host_id;
hba->hba_ptr = fd_host;
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);
pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n",
hba->hba_id, fd_host->fd_host_id);
return 0;
}
static void fd_detach_hba(struct se_hba *hba)
{
struct fd_host *fd_host = hba->hba_ptr;
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 struct se_device *fd_alloc_device(struct se_hba *hba, const char *name)
{
struct fd_dev *fd_dev;
struct fd_host *fd_host = hba->hba_ptr;
fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL);
if (!fd_dev) {
pr_err("Unable to allocate memory for struct fd_dev\n");
return NULL;
}
fd_dev->fd_host = fd_host;
pr_debug("FILEIO: Allocated fd_dev for %p\n", name);
return &fd_dev->dev;
}
static int fd_configure_device(struct se_device *dev)
{
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 flags, ret = -EINVAL;
if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
pr_err("Missing fd_dev_name=\n");
return -EINVAL;
}
/*
* Use O_DSYNC by default instead of O_SYNC to forgo syncing
* of pure timestamp updates.
*/
flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
/*
* 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;
}
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;
/*
* If using a block backend with this struct file, we extract
* fd_dev->fd_[block,dev]_size from struct block_device.
*
* Otherwise, we use the passed fd_size= from configfs
*/
inode = file->f_mapping->host;
if (S_ISBLK(inode->i_mode)) {
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
*/
dev_size = (i_size_read(file->f_mapping->host) -
fd_dev->fd_block_size);
pr_debug("FILEIO: Using size: %llu bytes from struct"
" block_device blocks: %llu logical_block_size: %d\n",
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)) {
pr_err("FILEIO: Missing fd_dev_size="
" parameter, and no backing struct"
" block_device\n");
goto fail;
}
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->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;
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;
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);
return 0;
fail:
if (fd_dev->fd_file) {
filp_close(fd_dev->fd_file, NULL);
fd_dev->fd_file = NULL;
}
return ret;
}
static void fd_free_device(struct se_device *dev)
{
struct fd_dev *fd_dev = FD_DEV(dev);
if (fd_dev->fd_file) {
filp_close(fd_dev->fd_file, NULL);
fd_dev->fd_file = NULL;
}
kfree(fd_dev);
}
static int fd_do_rw(struct se_cmd *cmd, struct file *fd,
u32 block_size, struct scatterlist *sgl,
u32 sgl_nents, u32 data_length, int is_write)
{
struct scatterlist *sg;
struct iov_iter iter;
struct bio_vec *bvec;
ssize_t len = 0;
loff_t pos = (cmd->t_task_lba * block_size);
int ret = 0, i;
bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL);
if (!bvec) {
pr_err("Unable to allocate fd_do_readv iov[]\n");
return -ENOMEM;
}
for_each_sg(sgl, sg, sgl_nents, i) {
bvec[i].bv_page = sg_page(sg);
bvec[i].bv_len = sg->length;
bvec[i].bv_offset = sg->offset;
len += sg->length;
}
iov_iter_bvec(&iter, ITER_BVEC, bvec, sgl_nents, len);
if (is_write)
ret = vfs_iter_write(fd, &iter, &pos);
else
ret = vfs_iter_read(fd, &iter, &pos);
kfree(bvec);
if (is_write) {
if (ret < 0 || ret != 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 != data_length) {
pr_err("%s() returned %d, expecting %u for "
"S_ISBLK\n", __func__, ret,
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 sense_reason_t
fd_execute_sync_cache(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct fd_dev *fd_dev = FD_DEV(dev);
int immed = (cmd->t_task_cdb[1] & 0x2);
loff_t start, end;
int ret;
/*
* If the Immediate bit is set, queue up the GOOD response
* for this SYNCHRONIZE_CACHE op
*/
if (immed)
target_complete_cmd(cmd, SAM_STAT_GOOD);
/*
* Determine if we will be flushing the entire device.
*/
if (cmd->t_task_lba == 0 && cmd->data_length == 0) {
start = 0;
end = LLONG_MAX;
} else {
start = cmd->t_task_lba * dev->dev_attrib.block_size;
if (cmd->data_length)
end = start + cmd->data_length - 1;
else
end = LLONG_MAX;
}
ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
if (ret != 0)
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);
return 0;
}
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);
loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size;
sector_t nolb = sbc_get_write_same_sectors(cmd);
struct iov_iter iter;
struct bio_vec *bvec;
unsigned int len = 0, i;
ssize_t ret;
if (!nolb) {
target_complete_cmd(cmd, SAM_STAT_GOOD);
return 0;
}
if (cmd->prot_op) {
pr_err("WRITE_SAME: Protection information with FILEIO"
" backends not supported\n");
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
if (cmd->t_data_nents > 1 ||
cmd->t_data_sg[0].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,
cmd->t_data_sg[0].length,
cmd->se_dev->dev_attrib.block_size);
return TCM_INVALID_CDB_FIELD;
}
bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL);
if (!bvec)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
for (i = 0; i < nolb; i++) {
bvec[i].bv_page = sg_page(&cmd->t_data_sg[0]);
bvec[i].bv_len = cmd->t_data_sg[0].length;
bvec[i].bv_offset = cmd->t_data_sg[0].offset;
len += se_dev->dev_attrib.block_size;
}
iov_iter_bvec(&iter, ITER_BVEC, bvec, nolb, len);
ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos);
kfree(bvec);
if (ret < 0 || ret != len) {
pr_err("vfs_iter_write() returned %zd for write same\n", ret);
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
target_complete_cmd(cmd, SAM_STAT_GOOD);
return 0;
}
static int
fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb,
void *buf, size_t bufsize)
{
struct fd_dev *fd_dev = FD_DEV(se_dev);
struct file *prot_fd = fd_dev->fd_prot_file;
sector_t prot_length, prot;
loff_t pos = lba * se_dev->prot_length;
if (!prot_fd) {
pr_err("Unable to locate fd_dev->fd_prot_file\n");
return -ENODEV;
}
prot_length = nolb * se_dev->prot_length;
for (prot = 0; prot < prot_length;) {
sector_t len = min_t(sector_t, bufsize, prot_length - prot);
ssize_t ret = kernel_write(prot_fd, buf, len, pos + prot);
if (ret != len) {
pr_err("vfs_write to prot file failed: %zd\n", ret);
return ret < 0 ? ret : -ENODEV;
}
prot += ret;
}
return 0;
}
static int
fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
{
void *buf;
int rc;
buf = (void *)__get_free_page(GFP_KERNEL);
if (!buf) {
pr_err("Unable to allocate FILEIO prot buf\n");
return -ENOMEM;
}
memset(buf, 0xff, PAGE_SIZE);
rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE);
free_page((unsigned long)buf);
return rc;
}
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 (cmd->se_dev->dev_attrib.pi_prot_type) {
ret = fd_do_prot_unmap(cmd, lba, nolb);
if (ret)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
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;
}
static sense_reason_t
fd_execute_write_same_unmap(struct se_cmd *cmd)
{
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);
sense_reason_t ret;
if (!nolb) {
target_complete_cmd(cmd, SAM_STAT_GOOD);
return 0;
}
ret = fd_do_unmap(cmd, file, lba, nolb);
if (ret)
return ret;
target_complete_cmd(cmd, GOOD);
return 0;
}
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_device *dev = cmd->se_dev;
struct fd_dev *fd_dev = FD_DEV(dev);
struct file *file = fd_dev->fd_file;
struct file *pfile = fd_dev->fd_prot_file;
sense_reason_t rc;
int ret = 0;
/*
* We are currently limited by the number of iovecs (2048) per
* single vfs_[writev,readv] call.
*/
if (cmd->data_length > FD_MAX_BYTES) {
pr_err("FILEIO: Not able to process I/O of %u bytes due to"
"FD_MAX_BYTES: %u iovec count limitiation\n",
cmd->data_length, FD_MAX_BYTES);
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
/*
* Call vectorized fileio functions to map struct scatterlist
* physical memory addresses to struct iovec virtual memory.
*/
if (data_direction == DMA_FROM_DEVICE) {
if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
ret = fd_do_rw(cmd, pfile, dev->prot_length,
cmd->t_prot_sg, cmd->t_prot_nents,
cmd->prot_length, 0);
if (ret < 0)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
sgl, sgl_nents, cmd->data_length, 0);
if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
u32 sectors = cmd->data_length >>
ilog2(dev->dev_attrib.block_size);
rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
0, cmd->t_prot_sg, 0);
if (rc)
return rc;
}
} else {
if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
u32 sectors = cmd->data_length >>
ilog2(dev->dev_attrib.block_size);
rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
0, cmd->t_prot_sg, 0);
if (rc)
return rc;
}
ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
sgl, sgl_nents, cmd->data_length, 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 && (cmd->se_cmd_flags & SCF_FUA)) {
loff_t start = cmd->t_task_lba *
dev->dev_attrib.block_size;
loff_t end;
if (cmd->data_length)
end = start + cmd->data_length - 1;
else
end = LLONG_MAX;
vfs_fsync_range(fd_dev->fd_file, start, end, 1);
}
if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
ret = fd_do_rw(cmd, pfile, dev->prot_length,
cmd->t_prot_sg, cmd->t_prot_nents,
cmd->prot_length, 1);
if (ret < 0)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
}
if (ret < 0)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
if (ret)
target_complete_cmd(cmd, SAM_STAT_GOOD);
return 0;
}
enum {
Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err
};
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_io=%d"},
{Opt_err, NULL}
};
static ssize_t fd_set_configfs_dev_params(struct se_device *dev,
const char *page, ssize_t count)
{
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;
opts = kstrdup(page, GFP_KERNEL);
if (!opts)
return -ENOMEM;
orig = opts;
while ((ptr = strsep(&opts, ",\n")) != NULL) {
if (!*ptr)
continue;
token = match_token(ptr, tokens, args);
switch (token) {
case Opt_fd_dev_name:
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]);
if (!arg_p) {
ret = -ENOMEM;
break;
}
ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size);
kfree(arg_p);
if (ret < 0) {
pr_err("kstrtoull() failed for"
" fd_dev_size=\n");
goto out;
}
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:
ret = match_int(args, &arg);
if (ret)
goto out;
if (arg != 1) {
pr_err("bogus fd_buffered_io=%d value\n", arg);
ret = -EINVAL;
goto out;
}
pr_debug("FILEIO: Using buffered I/O"
" operations for struct fd_dev\n");
fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE;
break;
default:
break;
}
}
out:
kfree(orig);
return (!ret) ? count : ret;
}
static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b)
{
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_HAS_BUFFERED_IO_WCE) ?
"Buffered-WCE" : "O_DSYNC");
return bl;
}
static sector_t fd_get_blocks(struct se_device *dev)
{
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 div_u64(dev_size - dev->dev_attrib.block_size,
dev->dev_attrib.block_size);
}
static int fd_init_prot(struct se_device *dev)
{
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;
}
static int fd_format_prot(struct se_device *dev)
{
unsigned char *buf;
int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size;
int ret;
if (!dev->dev_attrib.pi_prot_type) {
pr_err("Unable to format_prot while pi_prot_type == 0\n");
return -ENODEV;
}
buf = vzalloc(unit_size);
if (!buf) {
pr_err("Unable to allocate FILEIO prot buf\n");
return -ENOMEM;
}
pr_debug("Using FILEIO prot_length: %llu\n",
(unsigned long long)(dev->transport->get_blocks(dev) + 1) *
dev->prot_length);
memset(buf, 0xff, unit_size);
ret = fd_do_prot_fill(dev, 0, dev->transport->get_blocks(dev) + 1,
buf, unit_size);
vfree(buf);
return ret;
}
static void fd_free_prot(struct se_device *dev)
{
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;
}
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);
}
DEF_TB_DEFAULT_ATTRIBS(fileio);
static struct configfs_attribute *fileio_backend_dev_attrs[] = {
&fileio_dev_attrib_emulate_model_alias.attr,
&fileio_dev_attrib_emulate_dpo.attr,
&fileio_dev_attrib_emulate_fua_write.attr,
&fileio_dev_attrib_emulate_fua_read.attr,
&fileio_dev_attrib_emulate_write_cache.attr,
&fileio_dev_attrib_emulate_ua_intlck_ctrl.attr,
&fileio_dev_attrib_emulate_tas.attr,
&fileio_dev_attrib_emulate_tpu.attr,
&fileio_dev_attrib_emulate_tpws.attr,
&fileio_dev_attrib_emulate_caw.attr,
&fileio_dev_attrib_emulate_3pc.attr,
&fileio_dev_attrib_pi_prot_type.attr,
&fileio_dev_attrib_hw_pi_prot_type.attr,
&fileio_dev_attrib_pi_prot_format.attr,
&fileio_dev_attrib_enforce_pr_isids.attr,
&fileio_dev_attrib_is_nonrot.attr,
&fileio_dev_attrib_emulate_rest_reord.attr,
&fileio_dev_attrib_force_pr_aptpl.attr,
&fileio_dev_attrib_hw_block_size.attr,
&fileio_dev_attrib_block_size.attr,
&fileio_dev_attrib_hw_max_sectors.attr,
&fileio_dev_attrib_optimal_sectors.attr,
&fileio_dev_attrib_hw_queue_depth.attr,
&fileio_dev_attrib_queue_depth.attr,
&fileio_dev_attrib_max_unmap_lba_count.attr,
&fileio_dev_attrib_max_unmap_block_desc_count.attr,
&fileio_dev_attrib_unmap_granularity.attr,
&fileio_dev_attrib_unmap_granularity_alignment.attr,
&fileio_dev_attrib_max_write_same_len.attr,
NULL,
};
static struct se_subsystem_api fileio_template = {
.name = "fileio",
.inquiry_prod = "FILEIO",
.inquiry_rev = FD_VERSION,
.owner = THIS_MODULE,
.attach_hba = fd_attach_hba,
.detach_hba = fd_detach_hba,
.alloc_device = fd_alloc_device,
.configure_device = fd_configure_device,
.free_device = fd_free_device,
.parse_cdb = fd_parse_cdb,
.set_configfs_dev_params = fd_set_configfs_dev_params,
.show_configfs_dev_params = fd_show_configfs_dev_params,
.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)
{
struct target_backend_cits *tbc = &fileio_template.tb_cits;
target_core_setup_sub_cits(&fileio_template);
tbc->tb_dev_attrib_cit.ct_attrs = fileio_backend_dev_attrs;
return transport_subsystem_register(&fileio_template);
}
static void __exit fileio_module_exit(void)
{
transport_subsystem_release(&fileio_template);
}
MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
MODULE_AUTHOR("nab@Linux-iSCSI.org");
MODULE_LICENSE("GPL");
module_init(fileio_module_init);
module_exit(fileio_module_exit);