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205 lines
5.9 KiB
205 lines
5.9 KiB
/* |
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* Copyright (C) 2000 Jens Axboe <[email protected]> |
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* Copyright (C) 2001-2004 Peter Osterlund <[email protected]> |
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* |
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* May be copied or modified under the terms of the GNU General Public |
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* License. See linux/COPYING for more information. |
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* |
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* Packet writing layer for ATAPI and SCSI CD-R, CD-RW, DVD-R, and |
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* DVD-RW devices. |
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* |
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*/ |
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#ifndef __PKTCDVD_H |
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#define __PKTCDVD_H |
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#include <linux/blkdev.h> |
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#include <linux/completion.h> |
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#include <linux/cdrom.h> |
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#include <linux/kobject.h> |
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#include <linux/sysfs.h> |
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#include <linux/mempool.h> |
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#include <uapi/linux/pktcdvd.h> |
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/* default bio write queue congestion marks */ |
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#define PKT_WRITE_CONGESTION_ON 10000 |
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#define PKT_WRITE_CONGESTION_OFF 9000 |
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struct packet_settings |
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{ |
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__u32 size; /* packet size in (512 byte) sectors */ |
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__u8 fp; /* fixed packets */ |
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__u8 link_loss; /* the rest is specified |
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* as per Mt Fuji */ |
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__u8 write_type; |
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__u8 track_mode; |
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__u8 block_mode; |
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}; |
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/* |
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* Very crude stats for now |
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*/ |
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struct packet_stats |
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{ |
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unsigned long pkt_started; |
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unsigned long pkt_ended; |
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unsigned long secs_w; |
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unsigned long secs_rg; |
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unsigned long secs_r; |
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}; |
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struct packet_cdrw |
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{ |
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struct list_head pkt_free_list; |
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struct list_head pkt_active_list; |
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spinlock_t active_list_lock; /* Serialize access to pkt_active_list */ |
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struct task_struct *thread; |
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atomic_t pending_bios; |
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}; |
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/* |
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* Switch to high speed reading after reading this many kilobytes |
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* with no interspersed writes. |
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*/ |
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#define HI_SPEED_SWITCH 512 |
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struct packet_iosched |
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{ |
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atomic_t attention; /* Set to non-zero when queue processing is needed */ |
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int writing; /* Non-zero when writing, zero when reading */ |
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spinlock_t lock; /* Protecting read/write queue manipulations */ |
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struct bio_list read_queue; |
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struct bio_list write_queue; |
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sector_t last_write; /* The sector where the last write ended */ |
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int successive_reads; |
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}; |
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/* |
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* 32 buffers of 2048 bytes |
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*/ |
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#if (PAGE_SIZE % CD_FRAMESIZE) != 0 |
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#error "PAGE_SIZE must be a multiple of CD_FRAMESIZE" |
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#endif |
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#define PACKET_MAX_SIZE 128 |
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#define FRAMES_PER_PAGE (PAGE_SIZE / CD_FRAMESIZE) |
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#define PACKET_MAX_SECTORS (PACKET_MAX_SIZE * CD_FRAMESIZE >> 9) |
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enum packet_data_state { |
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PACKET_IDLE_STATE, /* Not used at the moment */ |
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PACKET_WAITING_STATE, /* Waiting for more bios to arrive, so */ |
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/* we don't have to do as much */ |
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/* data gathering */ |
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PACKET_READ_WAIT_STATE, /* Waiting for reads to fill in holes */ |
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PACKET_WRITE_WAIT_STATE, /* Waiting for the write to complete */ |
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PACKET_RECOVERY_STATE, /* Recover after read/write errors */ |
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PACKET_FINISHED_STATE, /* After write has finished */ |
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PACKET_NUM_STATES /* Number of possible states */ |
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}; |
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/* |
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* Information needed for writing a single packet |
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*/ |
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struct pktcdvd_device; |
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struct packet_data |
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{ |
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struct list_head list; |
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spinlock_t lock; /* Lock protecting state transitions and */ |
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/* orig_bios list */ |
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struct bio_list orig_bios; /* Original bios passed to pkt_make_request */ |
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/* that will be handled by this packet */ |
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int write_size; /* Total size of all bios in the orig_bios */ |
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/* list, measured in number of frames */ |
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struct bio *w_bio; /* The bio we will send to the real CD */ |
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/* device once we have all data for the */ |
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/* packet we are going to write */ |
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sector_t sector; /* First sector in this packet */ |
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int frames; /* Number of frames in this packet */ |
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enum packet_data_state state; /* Current state */ |
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atomic_t run_sm; /* Incremented whenever the state */ |
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/* machine needs to be run */ |
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long sleep_time; /* Set this to non-zero to make the state */ |
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/* machine run after this many jiffies. */ |
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atomic_t io_wait; /* Number of pending IO operations */ |
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atomic_t io_errors; /* Number of read/write errors during IO */ |
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struct bio *r_bios[PACKET_MAX_SIZE]; /* bios to use during data gathering */ |
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struct page *pages[PACKET_MAX_SIZE / FRAMES_PER_PAGE]; |
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int cache_valid; /* If non-zero, the data for the zone defined */ |
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/* by the sector variable is completely cached */ |
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/* in the pages[] vector. */ |
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int id; /* ID number for debugging */ |
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struct pktcdvd_device *pd; |
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}; |
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struct pkt_rb_node { |
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struct rb_node rb_node; |
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struct bio *bio; |
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}; |
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struct packet_stacked_data |
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{ |
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struct bio *bio; /* Original read request bio */ |
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struct pktcdvd_device *pd; |
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}; |
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#define PSD_POOL_SIZE 64 |
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struct pktcdvd_kobj |
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{ |
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struct kobject kobj; |
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struct pktcdvd_device *pd; |
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}; |
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#define to_pktcdvdkobj(_k) \ |
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((struct pktcdvd_kobj*)container_of(_k,struct pktcdvd_kobj,kobj)) |
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struct pktcdvd_device |
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{ |
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struct block_device *bdev; /* dev attached */ |
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dev_t pkt_dev; /* our dev */ |
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char name[20]; |
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struct packet_settings settings; |
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struct packet_stats stats; |
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int refcnt; /* Open count */ |
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int write_speed; /* current write speed, kB/s */ |
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int read_speed; /* current read speed, kB/s */ |
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unsigned long offset; /* start offset */ |
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__u8 mode_offset; /* 0 / 8 */ |
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__u8 type; |
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unsigned long flags; |
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__u16 mmc3_profile; |
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__u32 nwa; /* next writable address */ |
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__u32 lra; /* last recorded address */ |
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struct packet_cdrw cdrw; |
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wait_queue_head_t wqueue; |
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spinlock_t lock; /* Serialize access to bio_queue */ |
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struct rb_root bio_queue; /* Work queue of bios we need to handle */ |
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int bio_queue_size; /* Number of nodes in bio_queue */ |
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sector_t current_sector; /* Keep track of where the elevator is */ |
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atomic_t scan_queue; /* Set to non-zero when pkt_handle_queue */ |
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/* needs to be run. */ |
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mempool_t rb_pool; /* mempool for pkt_rb_node allocations */ |
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struct packet_iosched iosched; |
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struct gendisk *disk; |
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int write_congestion_off; |
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int write_congestion_on; |
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struct device *dev; /* sysfs pktcdvd[0-7] dev */ |
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struct pktcdvd_kobj *kobj_stat; /* sysfs pktcdvd[0-7]/stat/ */ |
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struct pktcdvd_kobj *kobj_wqueue; /* sysfs pktcdvd[0-7]/write_queue/ */ |
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struct dentry *dfs_d_root; /* debugfs: devname directory */ |
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struct dentry *dfs_f_info; /* debugfs: info file */ |
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}; |
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#endif /* __PKTCDVD_H */
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