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TOMOYO Linux Cross Reference
Linux/include/linux/pktcdvd.h

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  1 /*
  2  * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
  3  * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
  4  *
  5  * May be copied or modified under the terms of the GNU General Public
  6  * License.  See linux/COPYING for more information.
  7  *
  8  * Packet writing layer for ATAPI and SCSI CD-R, CD-RW, DVD-R, and
  9  * DVD-RW devices.
 10  *
 11  */
 12 #ifndef __PKTCDVD_H
 13 #define __PKTCDVD_H
 14 
 15 #include <linux/blkdev.h>
 16 #include <linux/completion.h>
 17 #include <linux/cdrom.h>
 18 #include <linux/kobject.h>
 19 #include <linux/sysfs.h>
 20 #include <linux/mempool.h>
 21 #include <uapi/linux/pktcdvd.h>
 22 
 23 /* default bio write queue congestion marks */
 24 #define PKT_WRITE_CONGESTION_ON    10000
 25 #define PKT_WRITE_CONGESTION_OFF   9000
 26 
 27 
 28 struct packet_settings
 29 {
 30         __u32                   size;           /* packet size in (512 byte) sectors */
 31         __u8                    fp;             /* fixed packets */
 32         __u8                    link_loss;      /* the rest is specified
 33                                                  * as per Mt Fuji */
 34         __u8                    write_type;
 35         __u8                    track_mode;
 36         __u8                    block_mode;
 37 };
 38 
 39 /*
 40  * Very crude stats for now
 41  */
 42 struct packet_stats
 43 {
 44         unsigned long           pkt_started;
 45         unsigned long           pkt_ended;
 46         unsigned long           secs_w;
 47         unsigned long           secs_rg;
 48         unsigned long           secs_r;
 49 };
 50 
 51 struct packet_cdrw
 52 {
 53         struct list_head        pkt_free_list;
 54         struct list_head        pkt_active_list;
 55         spinlock_t              active_list_lock; /* Serialize access to pkt_active_list */
 56         struct task_struct      *thread;
 57         atomic_t                pending_bios;
 58 };
 59 
 60 /*
 61  * Switch to high speed reading after reading this many kilobytes
 62  * with no interspersed writes.
 63  */
 64 #define HI_SPEED_SWITCH 512
 65 
 66 struct packet_iosched
 67 {
 68         atomic_t                attention;      /* Set to non-zero when queue processing is needed */
 69         int                     writing;        /* Non-zero when writing, zero when reading */
 70         spinlock_t              lock;           /* Protecting read/write queue manipulations */
 71         struct bio_list         read_queue;
 72         struct bio_list         write_queue;
 73         sector_t                last_write;     /* The sector where the last write ended */
 74         int                     successive_reads;
 75 };
 76 
 77 /*
 78  * 32 buffers of 2048 bytes
 79  */
 80 #if (PAGE_SIZE % CD_FRAMESIZE) != 0
 81 #error "PAGE_SIZE must be a multiple of CD_FRAMESIZE"
 82 #endif
 83 #define PACKET_MAX_SIZE         128
 84 #define FRAMES_PER_PAGE         (PAGE_SIZE / CD_FRAMESIZE)
 85 #define PACKET_MAX_SECTORS      (PACKET_MAX_SIZE * CD_FRAMESIZE >> 9)
 86 
 87 enum packet_data_state {
 88         PACKET_IDLE_STATE,                      /* Not used at the moment */
 89         PACKET_WAITING_STATE,                   /* Waiting for more bios to arrive, so */
 90                                                 /* we don't have to do as much */
 91                                                 /* data gathering */
 92         PACKET_READ_WAIT_STATE,                 /* Waiting for reads to fill in holes */
 93         PACKET_WRITE_WAIT_STATE,                /* Waiting for the write to complete */
 94         PACKET_RECOVERY_STATE,                  /* Recover after read/write errors */
 95         PACKET_FINISHED_STATE,                  /* After write has finished */
 96 
 97         PACKET_NUM_STATES                       /* Number of possible states */
 98 };
 99 
100 /*
101  * Information needed for writing a single packet
102  */
103 struct pktcdvd_device;
104 
105 struct packet_data
106 {
107         struct list_head        list;
108 
109         spinlock_t              lock;           /* Lock protecting state transitions and */
110                                                 /* orig_bios list */
111 
112         struct bio_list         orig_bios;      /* Original bios passed to pkt_make_request */
113                                                 /* that will be handled by this packet */
114         int                     write_size;     /* Total size of all bios in the orig_bios */
115                                                 /* list, measured in number of frames */
116 
117         struct bio              *w_bio;         /* The bio we will send to the real CD */
118                                                 /* device once we have all data for the */
119                                                 /* packet we are going to write */
120         sector_t                sector;         /* First sector in this packet */
121         int                     frames;         /* Number of frames in this packet */
122 
123         enum packet_data_state  state;          /* Current state */
124         atomic_t                run_sm;         /* Incremented whenever the state */
125                                                 /* machine needs to be run */
126         long                    sleep_time;     /* Set this to non-zero to make the state */
127                                                 /* machine run after this many jiffies. */
128 
129         atomic_t                io_wait;        /* Number of pending IO operations */
130         atomic_t                io_errors;      /* Number of read/write errors during IO */
131 
132         struct bio              *r_bios[PACKET_MAX_SIZE]; /* bios to use during data gathering */
133         struct page             *pages[PACKET_MAX_SIZE / FRAMES_PER_PAGE];
134 
135         int                     cache_valid;    /* If non-zero, the data for the zone defined */
136                                                 /* by the sector variable is completely cached */
137                                                 /* in the pages[] vector. */
138 
139         int                     id;             /* ID number for debugging */
140         struct pktcdvd_device   *pd;
141 };
142 
143 struct pkt_rb_node {
144         struct rb_node          rb_node;
145         struct bio              *bio;
146 };
147 
148 struct packet_stacked_data
149 {
150         struct bio              *bio;           /* Original read request bio */
151         struct pktcdvd_device   *pd;
152 };
153 #define PSD_POOL_SIZE           64
154 
155 struct pktcdvd_kobj
156 {
157         struct kobject          kobj;
158         struct pktcdvd_device   *pd;
159 };
160 #define to_pktcdvdkobj(_k) \
161   ((struct pktcdvd_kobj*)container_of(_k,struct pktcdvd_kobj,kobj))
162 
163 struct pktcdvd_device
164 {
165         struct block_device     *bdev;          /* dev attached */
166         dev_t                   pkt_dev;        /* our dev */
167         char                    name[20];
168         struct packet_settings  settings;
169         struct packet_stats     stats;
170         int                     refcnt;         /* Open count */
171         int                     write_speed;    /* current write speed, kB/s */
172         int                     read_speed;     /* current read speed, kB/s */
173         unsigned long           offset;         /* start offset */
174         __u8                    mode_offset;    /* 0 / 8 */
175         __u8                    type;
176         unsigned long           flags;
177         __u16                   mmc3_profile;
178         __u32                   nwa;            /* next writable address */
179         __u32                   lra;            /* last recorded address */
180         struct packet_cdrw      cdrw;
181         wait_queue_head_t       wqueue;
182 
183         spinlock_t              lock;           /* Serialize access to bio_queue */
184         struct rb_root          bio_queue;      /* Work queue of bios we need to handle */
185         int                     bio_queue_size; /* Number of nodes in bio_queue */
186         sector_t                current_sector; /* Keep track of where the elevator is */
187         atomic_t                scan_queue;     /* Set to non-zero when pkt_handle_queue */
188                                                 /* needs to be run. */
189         mempool_t               *rb_pool;       /* mempool for pkt_rb_node allocations */
190 
191         struct packet_iosched   iosched;
192         struct gendisk          *disk;
193 
194         int                     write_congestion_off;
195         int                     write_congestion_on;
196 
197         struct device           *dev;           /* sysfs pktcdvd[0-7] dev */
198         struct pktcdvd_kobj     *kobj_stat;     /* sysfs pktcdvd[0-7]/stat/     */
199         struct pktcdvd_kobj     *kobj_wqueue;   /* sysfs pktcdvd[0-7]/write_queue/ */
200 
201         struct dentry           *dfs_d_root;    /* debugfs: devname directory */
202         struct dentry           *dfs_f_info;    /* debugfs: info file */
203 };
204 
205 #endif /* __PKTCDVD_H */
206 

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