static int sg_set_reserved_size(struct request_queue *q, int __user *p)
{
int size, err = get_user(size, p);
if (err)
return err;
if (size < 0)
return -EINVAL;
if (size > (queue_max_sectors(q) << 9))
size = queue_max_sectors(q) << 9;
q->sg_reserved_size = size;
return 0;
}
static int max_sectors_bytes(struct request_queue *q)
{
unsigned int max_sectors = queue_max_sectors(q);
max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
return max_sectors << 9;
}
/*
* slave_configure()
*/
static int slave_configure(struct scsi_device *sdev)
{
struct us_data *us = host_to_us(sdev->host);
/* pr_info("scsiglue --- slave_configure\n"); */
if (us->fflags & (US_FL_MAX_SECTORS_64 | US_FL_MAX_SECTORS_MIN)) {
unsigned int max_sectors = 64;
if (us->fflags & US_FL_MAX_SECTORS_MIN)
max_sectors = PAGE_CACHE_SIZE >> 9;
if (queue_max_sectors(sdev->request_queue) > max_sectors)
blk_queue_max_hw_sectors(sdev->request_queue,
max_sectors);
}
static int slave_configure(struct scsi_device *sdev)
{
struct us_data *us = host_to_us(sdev->host);
/* Many devices have trouble transfering more than 32KB at a time,
* while others have trouble with more than 64K. At this time we
* are limiting both to 32K (64 sectores).
*/
if (us->fflags & (US_FL_MAX_SECTORS_64 | US_FL_MAX_SECTORS_MIN)) {
unsigned int max_sectors = 64;
if (us->fflags & US_FL_MAX_SECTORS_MIN)
max_sectors = PAGE_CACHE_SIZE >> 9;
if (queue_max_sectors(sdev->request_queue) > max_sectors)
blk_queue_max_sectors(sdev->request_queue,
max_sectors);
} else if (sdev->type == TYPE_TAPE) {
static int sg_get_reserved_size(struct request_queue *q, int __user *p)
{
unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);
return put_user(val, p);
}
/* 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)
{
char *dev_p = NULL;
struct se_device *dev;
struct se_dev_limits dev_limits;
struct queue_limits *limits;
struct fd_dev *fd_dev = p;
struct fd_host *fd_host = hba->hba_ptr;
mm_segment_t old_fs;
struct file *file;
struct inode *inode = NULL;
int dev_flags = 0, flags, ret = -EINVAL;
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);
if (IS_ERR(dev_p)) {
pr_err("getname(%s) failed: %lu\n",
fd_dev->fd_dev_name, IS_ERR(dev_p));
ret = PTR_ERR(dev_p);
goto fail;
}
/*
* 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(dev_p, flags, 0600);
if (IS_ERR(file)) {
pr_err("filp_open(%s) failed\n", dev_p);
ret = PTR_ERR(file);
goto fail;
}
if (!file || !file->f_dentry) {
pr_err("filp_open(%s) failed\n", dev_p);
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;
unsigned long long dev_size;
/*
* 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);
/*
* 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);
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);
} 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;
}
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;
}
dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH;
dev = transport_add_device_to_core_hba(hba, &fileio_template,
se_dev, dev_flags, 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->se_sub_dev->se_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);
putname(dev_p);
return dev;
fail:
if (fd_dev->fd_file) {
filp_close(fd_dev->fd_file, NULL);
fd_dev->fd_file = NULL;
}
putname(dev_p);
return ERR_PTR(ret);
}
/* 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)
{
char *dev_p = NULL;
struct se_device *dev;
struct se_dev_limits dev_limits;
struct queue_limits *limits;
struct fd_dev *fd_dev = p;
struct fd_host *fd_host = hba->hba_ptr;
mm_segment_t old_fs;
struct file *file;
struct inode *inode = NULL;
int dev_flags = 0, flags, ret = -EINVAL;
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);
if (IS_ERR(dev_p)) {
pr_err("getname(%s) failed: %lu\n",
fd_dev->fd_dev_name, IS_ERR(dev_p));
ret = PTR_ERR(dev_p);
goto fail;
}
/*
* 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;
file = filp_open(dev_p, flags, 0600);
if (IS_ERR(file)) {
pr_err("filp_open(%s) failed\n", dev_p);
ret = PTR_ERR(file);
goto fail;
}
if (!file || !file->f_dentry) {
pr_err("filp_open(%s) failed\n", dev_p);
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;
unsigned long long dev_size;
/*
* 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);
/*
* 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);
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);
} 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;
}
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;
}
dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH;
dev = transport_add_device_to_core_hba(hba, &fileio_template,
se_dev, dev_flags, fd_dev,
&dev_limits, "FILEIO", FD_VERSION);
if (!dev)
goto fail;
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);
putname(dev_p);
return dev;
fail:
if (fd_dev->fd_file) {
filp_close(fd_dev->fd_file, NULL);
fd_dev->fd_file = NULL;
}
putname(dev_p);
return ERR_PTR(ret);
}
/**
* blkdev_report_zones - Get zones information
* @bdev: Target block device
* @sector: Sector from which to report zones
* @zones: Array of zone structures where to return the zones information
* @nr_zones: Number of zone structures in the zone array
* @gfp_mask: Memory allocation flags (for bio_alloc)
*
* Description:
* Get zone information starting from the zone containing @sector.
* The number of zone information reported may be less than the number
* requested by @nr_zones. The number of zones actually reported is
* returned in @nr_zones.
*/
int blkdev_report_zones(struct block_device *bdev,
sector_t sector,
struct blk_zone *zones,
unsigned int *nr_zones,
gfp_t gfp_mask)
{
struct request_queue *q = bdev_get_queue(bdev);
struct blk_zone_report_hdr *hdr;
unsigned int nrz = *nr_zones;
struct page *page;
unsigned int nr_rep;
size_t rep_bytes;
unsigned int nr_pages;
struct bio *bio;
struct bio_vec *bv;
unsigned int i, n, nz;
unsigned int ofst;
void *addr;
int ret = 0;
if (!q)
return -ENXIO;
if (!blk_queue_is_zoned(q))
return -EOPNOTSUPP;
if (!nrz)
return 0;
if (sector > bdev->bd_part->nr_sects) {
*nr_zones = 0;
return 0;
}
/*
* The zone report has a header. So make room for it in the
* payload. Also make sure that the report fits in a single BIO
* that will not be split down the stack.
*/
rep_bytes = sizeof(struct blk_zone_report_hdr) +
sizeof(struct blk_zone) * nrz;
rep_bytes = (rep_bytes + PAGE_SIZE - 1) & PAGE_MASK;
if (rep_bytes > (queue_max_sectors(q) << 9))
rep_bytes = queue_max_sectors(q) << 9;
nr_pages = min_t(unsigned int, BIO_MAX_PAGES,
rep_bytes >> PAGE_SHIFT);
nr_pages = min_t(unsigned int, nr_pages,
queue_max_segments(q));
bio = bio_alloc(gfp_mask, nr_pages);
if (!bio)
return -ENOMEM;
bio->bi_bdev = bdev;
bio->bi_iter.bi_sector = blk_zone_start(q, sector);
bio_set_op_attrs(bio, REQ_OP_ZONE_REPORT, 0);
for (i = 0; i < nr_pages; i++) {
page = alloc_page(gfp_mask);
if (!page) {
ret = -ENOMEM;
goto out;
}
if (!bio_add_page(bio, page, PAGE_SIZE, 0)) {
__free_page(page);
break;
}
}
if (i == 0)
ret = -ENOMEM;
else
ret = submit_bio_wait(bio);
if (ret)
goto out;
/*
* Process the report result: skip the header and go through the
* reported zones to fixup and fixup the zone information for
* partitions. At the same time, return the zone information into
* the zone array.
*/
n = 0;
nz = 0;
nr_rep = 0;
bio_for_each_segment_all(bv, bio, i) {
if (!bv->bv_page)
break;
addr = kmap_atomic(bv->bv_page);
/* Get header in the first page */
ofst = 0;
if (!nr_rep) {
hdr = (struct blk_zone_report_hdr *) addr;
nr_rep = hdr->nr_zones;
ofst = sizeof(struct blk_zone_report_hdr);
}
/* Fixup and report zones */
while (ofst < bv->bv_len &&
n < nr_rep && nz < nrz) {
if (blkdev_report_zone(bdev, addr + ofst, &zones[nz]))
nz++;
ofst += sizeof(struct blk_zone);
n++;
}
kunmap_atomic(addr);
if (n >= nr_rep || nz >= nrz)
break;
}
out:
bio_for_each_segment_all(bv, bio, i)
__free_page(bv->bv_page);
bio_put(bio);
if (ret == 0)
*nr_zones = nz;
return ret;
}
