/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ST_H #define _ST_H #include <linux/completion.h> #include <linux/mutex.h> #include <linux/kref.h> #include <scsi/scsi_cmnd.h> /* Descriptor for analyzed sense data */ struct st_cmdstatus { int midlevel_result; struct scsi_sense_hdr sense_hdr; int have_sense; int residual; u64 uremainder64; u8 flags; u8 remainder_valid; u8 fixed_format; u8 deferred; }; struct scsi_tape; /* scsi tape command */ struct st_request { unsigned char cmd[MAX_COMMAND_SIZE]; unsigned char sense[SCSI_SENSE_BUFFERSIZE]; int result; struct scsi_tape *stp; struct completion *waiting; struct bio *bio; }; /* The tape buffer descriptor. */ struct st_buffer { unsigned char dma; /* DMA-able buffer */ unsigned char cleared; /* internal buffer cleared after open? */ unsigned short do_dio; /* direct i/o set up? */ int buffer_size; int buffer_blocks; int buffer_bytes; int read_pointer; int writing; int syscall_result; struct st_request *last_SRpnt; struct st_cmdstatus cmdstat; struct page **reserved_pages; int reserved_page_order; struct page **mapped_pages; struct rq_map_data map_data; unsigned char *b_data; unsigned short use_sg; /* zero or max number of s/g segments for this adapter */ unsigned short sg_segs; /* number of segments in s/g list */ unsigned short frp_segs; /* number of buffer segments */ }; /* The tape mode definition */ struct st_modedef { unsigned char defined; unsigned char sysv; /* SYS V semantics? */ unsigned char do_async_writes; unsigned char do_buffer_writes; unsigned char do_read_ahead; unsigned char defaults_for_writes; unsigned char default_compression; /* 0 = don't touch, etc */ short default_density; /* Forced density, -1 = no value */ int default_blksize; /* Forced blocksize, -1 = no value */ struct scsi_tape *tape; struct device *devs[2]; /* Auto-rewind and non-rewind devices */ struct cdev *cdevs[2]; /* Auto-rewind and non-rewind devices */ }; /* Number of modes can be changed by changing ST_NBR_MODE_BITS. The maximum number of modes is 16 (ST_NBR_MODE_BITS 4) */ #define ST_NBR_MODE_BITS 2 #define ST_NBR_MODES (1 << ST_NBR_MODE_BITS) #define ST_MODE_SHIFT (7 - ST_NBR_MODE_BITS) #define ST_MODE_MASK ((ST_NBR_MODES - 1) << ST_MODE_SHIFT) #define ST_MAX_TAPES (1 << (20 - (ST_NBR_MODE_BITS + 1))) #define ST_MAX_TAPE_ENTRIES (ST_MAX_TAPES << (ST_NBR_MODE_BITS + 1)) /* The status related to each partition */ struct st_partstat { unsigned char rw; unsigned char eof; unsigned char at_sm; unsigned char last_block_valid; u32 last_block_visited; int drv_block; /* The block where the drive head is */ int drv_file; }; /* Tape statistics */ struct scsi_tape_stats { atomic64_t read_byte_cnt; /* bytes read */ atomic64_t write_byte_cnt; /* bytes written */ atomic64_t in_flight; /* Number of I/Os in flight */ atomic64_t read_cnt; /* Count of read requests */ atomic64_t write_cnt; /* Count of write requests */ atomic64_t other_cnt; /* Count of other requests either * implicit or from user space * ioctl. */ atomic64_t resid_cnt; /* Count of resid_len > 0 */ atomic64_t tot_read_time; /* ktime spent completing reads */ atomic64_t tot_write_time; /* ktime spent completing writes */ atomic64_t tot_io_time; /* ktime spent doing any I/O */ ktime_t read_time; /* holds ktime request was queued */ ktime_t write_time; /* holds ktime request was queued */ ktime_t other_time; /* holds ktime request was queued */ atomic_t last_read_size; /* Number of bytes issued for last read */ atomic_t last_write_size; /* Number of bytes issued for last write */ }; #define ST_NBR_PARTITIONS 4 /* The tape drive descriptor */ struct scsi_tape { struct scsi_driver *driver; struct scsi_device *device; struct mutex lock; /* For serialization */ struct completion wait; /* For SCSI commands */ struct st_buffer *buffer; int index; /* Drive characteristics */ unsigned char omit_blklims; unsigned char do_auto_lock; unsigned char can_bsr; unsigned char can_partitions; unsigned char two_fm; unsigned char fast_mteom; unsigned char immediate; unsigned char restr_dma; unsigned char scsi2_logical; unsigned char default_drvbuffer; /* 0xff = don't touch, value 3 bits */ unsigned char cln_mode; /* 0 = none, otherwise sense byte nbr */ unsigned char cln_sense_value; unsigned char cln_sense_mask; unsigned char use_pf; /* Set Page Format bit in all mode selects? */ unsigned char try_dio; /* try direct i/o in general? */ unsigned char try_dio_now; /* try direct i/o before next close? */ unsigned char c_algo; /* compression algorithm */ unsigned char pos_unknown; /* after reset position unknown */ unsigned char sili; /* use SILI when reading in variable b mode */ unsigned char immediate_filemark; /* write filemark immediately */ int tape_type; int long_timeout; /* timeout for commands known to take long time */ /* Mode characteristics */ struct st_modedef modes[ST_NBR_MODES]; int current_mode; /* Status variables */ int partition; int new_partition; int nbr_partitions; /* zero until partition support enabled */ struct st_partstat ps[ST_NBR_PARTITIONS]; unsigned char dirty; unsigned char ready; unsigned char write_prot; unsigned char drv_write_prot; unsigned char in_use; unsigned char blksize_changed; unsigned char density_changed; unsigned char compression_changed; unsigned char drv_buffer; unsigned char density; unsigned char door_locked; unsigned char autorew_dev; /* auto-rewind device */ unsigned char rew_at_close; /* rewind necessary at close */ unsigned char inited; unsigned char cleaning_req; /* cleaning requested? */ int block_size; int min_block; int max_block; int recover_count; /* From tape opening */ int recover_reg; /* From last status call */ #if DEBUG unsigned char write_pending; int nbr_finished; int nbr_waits; int nbr_requests; int nbr_dio; int nbr_pages; unsigned char last_cmnd[6]; unsigned char last_sense[16]; #endif struct gendisk *disk; struct kref kref; struct scsi_tape_stats *stats; }; /* Bit masks for use_pf */ #define USE_PF 1 #define PF_TESTED 2 /* Values of eof */ #define ST_NOEOF 0 #define ST_FM_HIT 1 #define ST_FM 2 #define ST_EOM_OK 3 #define ST_EOM_ERROR 4 #define ST_EOD_1 5 #define ST_EOD_2 6 #define ST_EOD 7 /* EOD hit while reading => ST_EOD_1 => return zero => ST_EOD_2 => return zero => ST_EOD, return ENOSPC */ /* When writing: ST_EOM_OK == early warning found, write OK ST_EOD_1 == allow trying new write after early warning ST_EOM_ERROR == early warning found, not able to write all */ /* Values of rw */ #define ST_IDLE 0 #define ST_READING 1 #define ST_WRITING 2 /* Values of ready state */ #define ST_READY 0 #define ST_NOT_READY 1 #define ST_NO_TAPE 2 /* Values for door lock state */ #define ST_UNLOCKED 0 #define ST_LOCKED_EXPLICIT 1 #define ST_LOCKED_AUTO 2 #define ST_LOCK_FAILS 3 /* Positioning SCSI-commands for Tandberg, etc. drives */ #define QFA_REQUEST_BLOCK 0x02 #define QFA_SEEK_BLOCK 0x0c /* Setting the binary options */ #define ST_DONT_TOUCH 0 #define ST_NO 1 #define ST_YES 2 #define EXTENDED_SENSE_START 18 /* Masks for some conditions in the sense data */ #define SENSE_FMK 0x80 #define SENSE_EOM 0x40 #define SENSE_ILI 0x20 #endifOverall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 439 | 55.22% | 29 | 49.15% |
| Kai Mäkisara | 131 | 16.48% | 11 | 18.64% |
| Shane M Seymour | 71 | 8.93% | 1 | 1.69% |
| Linus Torvalds | 48 | 6.04% | 4 | 6.78% |
| Mike Christie | 40 | 5.03% | 1 | 1.69% |
| FUJITA Tomonori | 24 | 3.02% | 4 | 6.78% |
| Jeff Mahoney | 18 | 2.26% | 3 | 5.08% |
| Al Viro | 8 | 1.01% | 1 | 1.69% |
| David Jeffery | 5 | 0.63% | 1 | 1.69% |
| Lee Duncan | 5 | 0.63% | 1 | 1.69% |
| Matthias Kaehlcke | 4 | 0.50% | 1 | 1.69% |
| Christoph Hellwig | 1 | 0.13% | 1 | 1.69% |
| Greg Kroah-Hartman | 1 | 0.13% | 1 | 1.69% |
| Total | 795 | 100.00% | 59 | 100.00% |