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/* * Copyright (C) 2000 Jens Axboe <axboe@suse.de> * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com> * * May be copied or modified under the terms of the GNU General Public * License. See linux/COPYING for more information. * * Packet writing layer for ATAPI and SCSI CD-R, CD-RW, DVD-R, and * DVD-RW devices. * */ #ifndef __PKTCDVD_H #define __PKTCDVD_H #include <linux/blkdev.h> #include <linux/completion.h> #include <linux/cdrom.h> #include <linux/kobject.h> #include <linux/sysfs.h> #include <linux/mempool.h> #include <uapi/linux/pktcdvd.h> /* default bio write queue congestion marks */ #define PKT_WRITE_CONGESTION_ON 10000 #define PKT_WRITE_CONGESTION_OFF 9000 struct packet_settings { __u32 size; /* packet size in (512 byte) sectors */ __u8 fp; /* fixed packets */ __u8 link_loss; /* the rest is specified * as per Mt Fuji */ __u8 write_type; __u8 track_mode; __u8 block_mode; }; /* * Very crude stats for now */ struct packet_stats { unsigned long pkt_started; unsigned long pkt_ended; unsigned long secs_w; unsigned long secs_rg; unsigned long secs_r; }; struct packet_cdrw { struct list_head pkt_free_list; struct list_head pkt_active_list; spinlock_t active_list_lock; /* Serialize access to pkt_active_list */ struct task_struct *thread; atomic_t pending_bios; }; /* * Switch to high speed reading after reading this many kilobytes * with no interspersed writes. */ #define HI_SPEED_SWITCH 512 struct packet_iosched { atomic_t attention; /* Set to non-zero when queue processing is needed */ int writing; /* Non-zero when writing, zero when reading */ spinlock_t lock; /* Protecting read/write queue manipulations */ struct bio_list read_queue; struct bio_list write_queue; sector_t last_write; /* The sector where the last write ended */ int successive_reads; }; /* * 32 buffers of 2048 bytes */ #if (PAGE_SIZE % CD_FRAMESIZE) != 0 #error "PAGE_SIZE must be a multiple of CD_FRAMESIZE" #endif #define PACKET_MAX_SIZE 128 #define FRAMES_PER_PAGE (PAGE_SIZE / CD_FRAMESIZE) #define PACKET_MAX_SECTORS (PACKET_MAX_SIZE * CD_FRAMESIZE >> 9) enum packet_data_state { PACKET_IDLE_STATE, /* Not used at the moment */ PACKET_WAITING_STATE, /* Waiting for more bios to arrive, so */ /* we don't have to do as much */ /* data gathering */ PACKET_READ_WAIT_STATE, /* Waiting for reads to fill in holes */ PACKET_WRITE_WAIT_STATE, /* Waiting for the write to complete */ PACKET_RECOVERY_STATE, /* Recover after read/write errors */ PACKET_FINISHED_STATE, /* After write has finished */ PACKET_NUM_STATES /* Number of possible states */ }; /* * Information needed for writing a single packet */ struct pktcdvd_device; struct packet_data { struct list_head list; spinlock_t lock; /* Lock protecting state transitions and */ /* orig_bios list */ struct bio_list orig_bios; /* Original bios passed to pkt_make_request */ /* that will be handled by this packet */ int write_size; /* Total size of all bios in the orig_bios */ /* list, measured in number of frames */ struct bio *w_bio; /* The bio we will send to the real CD */ /* device once we have all data for the */ /* packet we are going to write */ sector_t sector; /* First sector in this packet */ int frames; /* Number of frames in this packet */ enum packet_data_state state; /* Current state */ atomic_t run_sm; /* Incremented whenever the state */ /* machine needs to be run */ long sleep_time; /* Set this to non-zero to make the state */ /* machine run after this many jiffies. */ atomic_t io_wait; /* Number of pending IO operations */ atomic_t io_errors; /* Number of read/write errors during IO */ struct bio *r_bios[PACKET_MAX_SIZE]; /* bios to use during data gathering */ struct page *pages[PACKET_MAX_SIZE / FRAMES_PER_PAGE]; int cache_valid; /* If non-zero, the data for the zone defined */ /* by the sector variable is completely cached */ /* in the pages[] vector. */ int id; /* ID number for debugging */ struct pktcdvd_device *pd; }; struct pkt_rb_node { struct rb_node rb_node; struct bio *bio; }; struct packet_stacked_data { struct bio *bio; /* Original read request bio */ struct pktcdvd_device *pd; }; #define PSD_POOL_SIZE 64 struct pktcdvd_device { struct file *bdev_file; /* dev attached */ /* handle acquired for bdev during pkt_open_dev() */ struct file *f_open_bdev; dev_t pkt_dev; /* our dev */ struct packet_settings settings; struct packet_stats stats; int refcnt; /* Open count */ int write_speed; /* current write speed, kB/s */ int read_speed; /* current read speed, kB/s */ unsigned long offset; /* start offset */ __u8 mode_offset; /* 0 / 8 */ __u8 type; unsigned long flags; __u16 mmc3_profile; __u32 nwa; /* next writable address */ __u32 lra; /* last recorded address */ struct packet_cdrw cdrw; wait_queue_head_t wqueue; spinlock_t lock; /* Serialize access to bio_queue */ struct rb_root bio_queue; /* Work queue of bios we need to handle */ int bio_queue_size; /* Number of nodes in bio_queue */ bool congested; /* Someone is waiting for bio_queue_size * to drop. */ sector_t current_sector; /* Keep track of where the elevator is */ atomic_t scan_queue; /* Set to non-zero when pkt_handle_queue */ /* needs to be run. */ mempool_t rb_pool; /* mempool for pkt_rb_node allocations */ struct packet_iosched iosched; struct gendisk *disk; int write_congestion_off; int write_congestion_on; struct device *dev; /* sysfs pktcdvd[0-7] dev */ struct dentry *dfs_d_root; /* debugfs: devname directory */ struct dentry *dfs_f_info; /* debugfs: info file */ }; #endif /* __PKTCDVD_H */