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45938335d0
st is a character driver and thus does not need to allocate a gendisk, which is only used for file system-like block layer I/O on block devices. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20210816131910.615153-3-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
246 lines
7.2 KiB
C
246 lines
7.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ST_H
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#define _ST_H
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#include <linux/completion.h>
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#include <linux/mutex.h>
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#include <linux/kref.h>
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#include <scsi/scsi_cmnd.h>
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/* Descriptor for analyzed sense data */
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struct st_cmdstatus {
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int midlevel_result;
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struct scsi_sense_hdr sense_hdr;
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int have_sense;
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int residual;
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u64 uremainder64;
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u8 flags;
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u8 remainder_valid;
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u8 fixed_format;
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u8 deferred;
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};
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struct scsi_tape;
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/* scsi tape command */
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struct st_request {
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unsigned char cmd[MAX_COMMAND_SIZE];
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unsigned char sense[SCSI_SENSE_BUFFERSIZE];
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int result;
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struct scsi_tape *stp;
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struct completion *waiting;
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struct bio *bio;
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};
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/* The tape buffer descriptor. */
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struct st_buffer {
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unsigned char cleared; /* internal buffer cleared after open? */
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unsigned short do_dio; /* direct i/o set up? */
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int buffer_size;
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int buffer_blocks;
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int buffer_bytes;
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int read_pointer;
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int writing;
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int syscall_result;
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struct st_request *last_SRpnt;
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struct st_cmdstatus cmdstat;
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struct page **reserved_pages;
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int reserved_page_order;
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struct page **mapped_pages;
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struct rq_map_data map_data;
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unsigned char *b_data;
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unsigned short use_sg; /* zero or max number of s/g segments for this adapter */
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unsigned short sg_segs; /* number of segments in s/g list */
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unsigned short frp_segs; /* number of buffer segments */
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};
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/* The tape mode definition */
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struct st_modedef {
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unsigned char defined;
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unsigned char sysv; /* SYS V semantics? */
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unsigned char do_async_writes;
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unsigned char do_buffer_writes;
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unsigned char do_read_ahead;
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unsigned char defaults_for_writes;
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unsigned char default_compression; /* 0 = don't touch, etc */
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short default_density; /* Forced density, -1 = no value */
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int default_blksize; /* Forced blocksize, -1 = no value */
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struct scsi_tape *tape;
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struct device *devs[2]; /* Auto-rewind and non-rewind devices */
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struct cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */
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};
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/* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum
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number of modes is 16 (ST_NBR_MODE_BITS 4) */
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#define ST_NBR_MODE_BITS 2
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#define ST_NBR_MODES (1 << ST_NBR_MODE_BITS)
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#define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS)
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#define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT)
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#define ST_MAX_TAPES (1 << (20 - (ST_NBR_MODE_BITS + 1)))
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#define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1))
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/* The status related to each partition */
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struct st_partstat {
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unsigned char rw;
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unsigned char eof;
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unsigned char at_sm;
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unsigned char last_block_valid;
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u32 last_block_visited;
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int drv_block; /* The block where the drive head is */
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int drv_file;
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};
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/* Tape statistics */
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struct scsi_tape_stats {
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atomic64_t read_byte_cnt; /* bytes read */
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atomic64_t write_byte_cnt; /* bytes written */
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atomic64_t in_flight; /* Number of I/Os in flight */
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atomic64_t read_cnt; /* Count of read requests */
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atomic64_t write_cnt; /* Count of write requests */
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atomic64_t other_cnt; /* Count of other requests either
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* implicit or from user space
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* ioctl. */
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atomic64_t resid_cnt; /* Count of resid_len > 0 */
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atomic64_t tot_read_time; /* ktime spent completing reads */
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atomic64_t tot_write_time; /* ktime spent completing writes */
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atomic64_t tot_io_time; /* ktime spent doing any I/O */
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ktime_t read_time; /* holds ktime request was queued */
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ktime_t write_time; /* holds ktime request was queued */
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ktime_t other_time; /* holds ktime request was queued */
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atomic_t last_read_size; /* Number of bytes issued for last read */
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atomic_t last_write_size; /* Number of bytes issued for last write */
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};
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#define ST_NBR_PARTITIONS 4
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/* The tape drive descriptor */
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struct scsi_tape {
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struct scsi_driver *driver;
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struct scsi_device *device;
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struct mutex lock; /* For serialization */
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struct completion wait; /* For SCSI commands */
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struct st_buffer *buffer;
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int index;
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/* Drive characteristics */
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unsigned char omit_blklims;
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unsigned char do_auto_lock;
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unsigned char can_bsr;
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unsigned char can_partitions;
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unsigned char two_fm;
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unsigned char fast_mteom;
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unsigned char immediate;
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unsigned char scsi2_logical;
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unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */
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unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */
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unsigned char cln_sense_value;
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unsigned char cln_sense_mask;
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unsigned char use_pf; /* Set Page Format bit in all mode selects? */
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unsigned char try_dio; /* try direct i/o in general? */
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unsigned char try_dio_now; /* try direct i/o before next close? */
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unsigned char c_algo; /* compression algorithm */
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unsigned char pos_unknown; /* after reset position unknown */
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unsigned char sili; /* use SILI when reading in variable b mode */
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unsigned char immediate_filemark; /* write filemark immediately */
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int tape_type;
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int long_timeout; /* timeout for commands known to take long time */
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/* Mode characteristics */
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struct st_modedef modes[ST_NBR_MODES];
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int current_mode;
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/* Status variables */
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int partition;
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int new_partition;
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int nbr_partitions; /* zero until partition support enabled */
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struct st_partstat ps[ST_NBR_PARTITIONS];
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unsigned char dirty;
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unsigned char ready;
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unsigned char write_prot;
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unsigned char drv_write_prot;
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unsigned char in_use;
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unsigned char blksize_changed;
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unsigned char density_changed;
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unsigned char compression_changed;
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unsigned char drv_buffer;
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unsigned char density;
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unsigned char door_locked;
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unsigned char autorew_dev; /* auto-rewind device */
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unsigned char rew_at_close; /* rewind necessary at close */
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unsigned char inited;
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unsigned char cleaning_req; /* cleaning requested? */
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int block_size;
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int min_block;
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int max_block;
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int recover_count; /* From tape opening */
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int recover_reg; /* From last status call */
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#if DEBUG
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unsigned char write_pending;
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int nbr_finished;
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int nbr_waits;
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int nbr_requests;
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int nbr_dio;
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int nbr_pages;
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unsigned char last_cmnd[6];
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unsigned char last_sense[16];
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#endif
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char name[DISK_NAME_LEN];
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struct kref kref;
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struct scsi_tape_stats *stats;
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};
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/* Bit masks for use_pf */
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#define USE_PF 1
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#define PF_TESTED 2
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/* Values of eof */
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#define ST_NOEOF 0
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#define ST_FM_HIT 1
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#define ST_FM 2
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#define ST_EOM_OK 3
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#define ST_EOM_ERROR 4
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#define ST_EOD_1 5
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#define ST_EOD_2 6
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#define ST_EOD 7
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/* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 =>
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return zero => ST_EOD, return ENOSPC */
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/* When writing: ST_EOM_OK == early warning found, write OK
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ST_EOD_1 == allow trying new write after early warning
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ST_EOM_ERROR == early warning found, not able to write all */
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/* Values of rw */
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#define ST_IDLE 0
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#define ST_READING 1
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#define ST_WRITING 2
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/* Values of ready state */
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#define ST_READY 0
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#define ST_NOT_READY 1
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#define ST_NO_TAPE 2
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/* Values for door lock state */
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#define ST_UNLOCKED 0
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#define ST_LOCKED_EXPLICIT 1
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#define ST_LOCKED_AUTO 2
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#define ST_LOCK_FAILS 3
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/* Positioning SCSI-commands for Tandberg, etc. drives */
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#define QFA_REQUEST_BLOCK 0x02
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#define QFA_SEEK_BLOCK 0x0c
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/* Setting the binary options */
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#define ST_DONT_TOUCH 0
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#define ST_NO 1
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#define ST_YES 2
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#define EXTENDED_SENSE_START 18
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/* Masks for some conditions in the sense data */
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#define SENSE_FMK 0x80
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#define SENSE_EOM 0x40
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#define SENSE_ILI 0x20
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#endif
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